[XFS] Cleanup inode extent size hint extraction
[linux-2.6.git] / fs / xfs / xfs_bmap.c
1 /*
2  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
3  * All Rights Reserved.
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU General Public License as
7  * published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it would be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write the Free Software Foundation,
16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
17  */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_types.h"
21 #include "xfs_bit.h"
22 #include "xfs_log.h"
23 #include "xfs_inum.h"
24 #include "xfs_trans.h"
25 #include "xfs_sb.h"
26 #include "xfs_ag.h"
27 #include "xfs_dir2.h"
28 #include "xfs_da_btree.h"
29 #include "xfs_bmap_btree.h"
30 #include "xfs_alloc_btree.h"
31 #include "xfs_ialloc_btree.h"
32 #include "xfs_dir2_sf.h"
33 #include "xfs_attr_sf.h"
34 #include "xfs_dinode.h"
35 #include "xfs_inode.h"
36 #include "xfs_btree.h"
37 #include "xfs_dmapi.h"
38 #include "xfs_mount.h"
39 #include "xfs_ialloc.h"
40 #include "xfs_itable.h"
41 #include "xfs_dir2_data.h"
42 #include "xfs_dir2_leaf.h"
43 #include "xfs_dir2_block.h"
44 #include "xfs_inode_item.h"
45 #include "xfs_extfree_item.h"
46 #include "xfs_alloc.h"
47 #include "xfs_bmap.h"
48 #include "xfs_rtalloc.h"
49 #include "xfs_error.h"
50 #include "xfs_attr_leaf.h"
51 #include "xfs_rw.h"
52 #include "xfs_quota.h"
53 #include "xfs_trans_space.h"
54 #include "xfs_buf_item.h"
55
56
57 #ifdef DEBUG
58 STATIC void
59 xfs_bmap_check_leaf_extents(xfs_btree_cur_t *cur, xfs_inode_t *ip, int whichfork);
60 #endif
61
62 kmem_zone_t             *xfs_bmap_free_item_zone;
63
64 /*
65  * Prototypes for internal bmap routines.
66  */
67
68
69 /*
70  * Called from xfs_bmap_add_attrfork to handle extents format files.
71  */
72 STATIC int                                      /* error */
73 xfs_bmap_add_attrfork_extents(
74         xfs_trans_t             *tp,            /* transaction pointer */
75         xfs_inode_t             *ip,            /* incore inode pointer */
76         xfs_fsblock_t           *firstblock,    /* first block allocated */
77         xfs_bmap_free_t         *flist,         /* blocks to free at commit */
78         int                     *flags);        /* inode logging flags */
79
80 /*
81  * Called from xfs_bmap_add_attrfork to handle local format files.
82  */
83 STATIC int                                      /* error */
84 xfs_bmap_add_attrfork_local(
85         xfs_trans_t             *tp,            /* transaction pointer */
86         xfs_inode_t             *ip,            /* incore inode pointer */
87         xfs_fsblock_t           *firstblock,    /* first block allocated */
88         xfs_bmap_free_t         *flist,         /* blocks to free at commit */
89         int                     *flags);        /* inode logging flags */
90
91 /*
92  * Called by xfs_bmapi to update file extent records and the btree
93  * after allocating space (or doing a delayed allocation).
94  */
95 STATIC int                              /* error */
96 xfs_bmap_add_extent(
97         xfs_inode_t             *ip,    /* incore inode pointer */
98         xfs_extnum_t            idx,    /* extent number to update/insert */
99         xfs_btree_cur_t         **curp, /* if *curp is null, not a btree */
100         xfs_bmbt_irec_t         *new,   /* new data to add to file extents */
101         xfs_fsblock_t           *first, /* pointer to firstblock variable */
102         xfs_bmap_free_t         *flist, /* list of extents to be freed */
103         int                     *logflagsp, /* inode logging flags */
104         xfs_extdelta_t          *delta, /* Change made to incore extents */
105         int                     whichfork, /* data or attr fork */
106         int                     rsvd);  /* OK to allocate reserved blocks */
107
108 /*
109  * Called by xfs_bmap_add_extent to handle cases converting a delayed
110  * allocation to a real allocation.
111  */
112 STATIC int                              /* error */
113 xfs_bmap_add_extent_delay_real(
114         xfs_inode_t             *ip,    /* incore inode pointer */
115         xfs_extnum_t            idx,    /* extent number to update/insert */
116         xfs_btree_cur_t         **curp, /* if *curp is null, not a btree */
117         xfs_bmbt_irec_t         *new,   /* new data to add to file extents */
118         xfs_filblks_t           *dnew,  /* new delayed-alloc indirect blocks */
119         xfs_fsblock_t           *first, /* pointer to firstblock variable */
120         xfs_bmap_free_t         *flist, /* list of extents to be freed */
121         int                     *logflagsp, /* inode logging flags */
122         xfs_extdelta_t          *delta, /* Change made to incore extents */
123         int                     rsvd);  /* OK to allocate reserved blocks */
124
125 /*
126  * Called by xfs_bmap_add_extent to handle cases converting a hole
127  * to a delayed allocation.
128  */
129 STATIC int                              /* error */
130 xfs_bmap_add_extent_hole_delay(
131         xfs_inode_t             *ip,    /* incore inode pointer */
132         xfs_extnum_t            idx,    /* extent number to update/insert */
133         xfs_bmbt_irec_t         *new,   /* new data to add to file extents */
134         int                     *logflagsp,/* inode logging flags */
135         xfs_extdelta_t          *delta, /* Change made to incore extents */
136         int                     rsvd);  /* OK to allocate reserved blocks */
137
138 /*
139  * Called by xfs_bmap_add_extent to handle cases converting a hole
140  * to a real allocation.
141  */
142 STATIC int                              /* error */
143 xfs_bmap_add_extent_hole_real(
144         xfs_inode_t             *ip,    /* incore inode pointer */
145         xfs_extnum_t            idx,    /* extent number to update/insert */
146         xfs_btree_cur_t         *cur,   /* if null, not a btree */
147         xfs_bmbt_irec_t         *new,   /* new data to add to file extents */
148         int                     *logflagsp, /* inode logging flags */
149         xfs_extdelta_t          *delta, /* Change made to incore extents */
150         int                     whichfork); /* data or attr fork */
151
152 /*
153  * Called by xfs_bmap_add_extent to handle cases converting an unwritten
154  * allocation to a real allocation or vice versa.
155  */
156 STATIC int                              /* error */
157 xfs_bmap_add_extent_unwritten_real(
158         xfs_inode_t             *ip,    /* incore inode pointer */
159         xfs_extnum_t            idx,    /* extent number to update/insert */
160         xfs_btree_cur_t         **curp, /* if *curp is null, not a btree */
161         xfs_bmbt_irec_t         *new,   /* new data to add to file extents */
162         int                     *logflagsp, /* inode logging flags */
163         xfs_extdelta_t          *delta); /* Change made to incore extents */
164
165 /*
166  * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
167  * It figures out where to ask the underlying allocator to put the new extent.
168  */
169 STATIC int                              /* error */
170 xfs_bmap_alloc(
171         xfs_bmalloca_t          *ap);   /* bmap alloc argument struct */
172
173 /*
174  * Transform a btree format file with only one leaf node, where the
175  * extents list will fit in the inode, into an extents format file.
176  * Since the file extents are already in-core, all we have to do is
177  * give up the space for the btree root and pitch the leaf block.
178  */
179 STATIC int                              /* error */
180 xfs_bmap_btree_to_extents(
181         xfs_trans_t             *tp,    /* transaction pointer */
182         xfs_inode_t             *ip,    /* incore inode pointer */
183         xfs_btree_cur_t         *cur,   /* btree cursor */
184         int                     *logflagsp, /* inode logging flags */
185         int                     whichfork); /* data or attr fork */
186
187 /*
188  * Called by xfs_bmapi to update file extent records and the btree
189  * after removing space (or undoing a delayed allocation).
190  */
191 STATIC int                              /* error */
192 xfs_bmap_del_extent(
193         xfs_inode_t             *ip,    /* incore inode pointer */
194         xfs_trans_t             *tp,    /* current trans pointer */
195         xfs_extnum_t            idx,    /* extent number to update/insert */
196         xfs_bmap_free_t         *flist, /* list of extents to be freed */
197         xfs_btree_cur_t         *cur,   /* if null, not a btree */
198         xfs_bmbt_irec_t         *new,   /* new data to add to file extents */
199         int                     *logflagsp,/* inode logging flags */
200         xfs_extdelta_t          *delta, /* Change made to incore extents */
201         int                     whichfork, /* data or attr fork */
202         int                     rsvd);   /* OK to allocate reserved blocks */
203
204 /*
205  * Remove the entry "free" from the free item list.  Prev points to the
206  * previous entry, unless "free" is the head of the list.
207  */
208 STATIC void
209 xfs_bmap_del_free(
210         xfs_bmap_free_t         *flist, /* free item list header */
211         xfs_bmap_free_item_t    *prev,  /* previous item on list, if any */
212         xfs_bmap_free_item_t    *free); /* list item to be freed */
213
214 /*
215  * Convert an extents-format file into a btree-format file.
216  * The new file will have a root block (in the inode) and a single child block.
217  */
218 STATIC int                                      /* error */
219 xfs_bmap_extents_to_btree(
220         xfs_trans_t             *tp,            /* transaction pointer */
221         xfs_inode_t             *ip,            /* incore inode pointer */
222         xfs_fsblock_t           *firstblock,    /* first-block-allocated */
223         xfs_bmap_free_t         *flist,         /* blocks freed in xaction */
224         xfs_btree_cur_t         **curp,         /* cursor returned to caller */
225         int                     wasdel,         /* converting a delayed alloc */
226         int                     *logflagsp,     /* inode logging flags */
227         int                     whichfork);     /* data or attr fork */
228
229 /*
230  * Convert a local file to an extents file.
231  * This code is sort of bogus, since the file data needs to get
232  * logged so it won't be lost.  The bmap-level manipulations are ok, though.
233  */
234 STATIC int                              /* error */
235 xfs_bmap_local_to_extents(
236         xfs_trans_t     *tp,            /* transaction pointer */
237         xfs_inode_t     *ip,            /* incore inode pointer */
238         xfs_fsblock_t   *firstblock,    /* first block allocated in xaction */
239         xfs_extlen_t    total,          /* total blocks needed by transaction */
240         int             *logflagsp,     /* inode logging flags */
241         int             whichfork);     /* data or attr fork */
242
243 /*
244  * Search the extents list for the inode, for the extent containing bno.
245  * If bno lies in a hole, point to the next entry.  If bno lies past eof,
246  * *eofp will be set, and *prevp will contain the last entry (null if none).
247  * Else, *lastxp will be set to the index of the found
248  * entry; *gotp will contain the entry.
249  */
250 STATIC xfs_bmbt_rec_t *                 /* pointer to found extent entry */
251 xfs_bmap_search_extents(
252         xfs_inode_t     *ip,            /* incore inode pointer */
253         xfs_fileoff_t   bno,            /* block number searched for */
254         int             whichfork,      /* data or attr fork */
255         int             *eofp,          /* out: end of file found */
256         xfs_extnum_t    *lastxp,        /* out: last extent index */
257         xfs_bmbt_irec_t *gotp,          /* out: extent entry found */
258         xfs_bmbt_irec_t *prevp);        /* out: previous extent entry found */
259
260 /*
261  * Check the last inode extent to determine whether this allocation will result
262  * in blocks being allocated at the end of the file. When we allocate new data
263  * blocks at the end of the file which do not start at the previous data block,
264  * we will try to align the new blocks at stripe unit boundaries.
265  */
266 STATIC int                              /* error */
267 xfs_bmap_isaeof(
268         xfs_inode_t     *ip,            /* incore inode pointer */
269         xfs_fileoff_t   off,            /* file offset in fsblocks */
270         int             whichfork,      /* data or attribute fork */
271         char            *aeof);         /* return value */
272
273 #ifdef XFS_BMAP_TRACE
274 /*
275  * Add a bmap trace buffer entry.  Base routine for the others.
276  */
277 STATIC void
278 xfs_bmap_trace_addentry(
279         int             opcode,         /* operation */
280         char            *fname,         /* function name */
281         char            *desc,          /* operation description */
282         xfs_inode_t     *ip,            /* incore inode pointer */
283         xfs_extnum_t    idx,            /* index of entry(ies) */
284         xfs_extnum_t    cnt,            /* count of entries, 1 or 2 */
285         xfs_bmbt_rec_t  *r1,            /* first record */
286         xfs_bmbt_rec_t  *r2,            /* second record or null */
287         int             whichfork);     /* data or attr fork */
288
289 /*
290  * Add bmap trace entry prior to a call to xfs_iext_remove.
291  */
292 STATIC void
293 xfs_bmap_trace_delete(
294         char            *fname,         /* function name */
295         char            *desc,          /* operation description */
296         xfs_inode_t     *ip,            /* incore inode pointer */
297         xfs_extnum_t    idx,            /* index of entry(entries) deleted */
298         xfs_extnum_t    cnt,            /* count of entries deleted, 1 or 2 */
299         int             whichfork);     /* data or attr fork */
300
301 /*
302  * Add bmap trace entry prior to a call to xfs_iext_insert, or
303  * reading in the extents list from the disk (in the btree).
304  */
305 STATIC void
306 xfs_bmap_trace_insert(
307         char            *fname,         /* function name */
308         char            *desc,          /* operation description */
309         xfs_inode_t     *ip,            /* incore inode pointer */
310         xfs_extnum_t    idx,            /* index of entry(entries) inserted */
311         xfs_extnum_t    cnt,            /* count of entries inserted, 1 or 2 */
312         xfs_bmbt_irec_t *r1,            /* inserted record 1 */
313         xfs_bmbt_irec_t *r2,            /* inserted record 2 or null */
314         int             whichfork);     /* data or attr fork */
315
316 /*
317  * Add bmap trace entry after updating an extent record in place.
318  */
319 STATIC void
320 xfs_bmap_trace_post_update(
321         char            *fname,         /* function name */
322         char            *desc,          /* operation description */
323         xfs_inode_t     *ip,            /* incore inode pointer */
324         xfs_extnum_t    idx,            /* index of entry updated */
325         int             whichfork);     /* data or attr fork */
326
327 /*
328  * Add bmap trace entry prior to updating an extent record in place.
329  */
330 STATIC void
331 xfs_bmap_trace_pre_update(
332         char            *fname,         /* function name */
333         char            *desc,          /* operation description */
334         xfs_inode_t     *ip,            /* incore inode pointer */
335         xfs_extnum_t    idx,            /* index of entry to be updated */
336         int             whichfork);     /* data or attr fork */
337
338 #else
339 #define xfs_bmap_trace_delete(f,d,ip,i,c,w)
340 #define xfs_bmap_trace_insert(f,d,ip,i,c,r1,r2,w)
341 #define xfs_bmap_trace_post_update(f,d,ip,i,w)
342 #define xfs_bmap_trace_pre_update(f,d,ip,i,w)
343 #endif  /* XFS_BMAP_TRACE */
344
345 /*
346  * Compute the worst-case number of indirect blocks that will be used
347  * for ip's delayed extent of length "len".
348  */
349 STATIC xfs_filblks_t
350 xfs_bmap_worst_indlen(
351         xfs_inode_t             *ip,    /* incore inode pointer */
352         xfs_filblks_t           len);   /* delayed extent length */
353
354 #ifdef DEBUG
355 /*
356  * Perform various validation checks on the values being returned
357  * from xfs_bmapi().
358  */
359 STATIC void
360 xfs_bmap_validate_ret(
361         xfs_fileoff_t           bno,
362         xfs_filblks_t           len,
363         int                     flags,
364         xfs_bmbt_irec_t         *mval,
365         int                     nmap,
366         int                     ret_nmap);
367 #else
368 #define xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap)
369 #endif /* DEBUG */
370
371 #if defined(XFS_RW_TRACE)
372 STATIC void
373 xfs_bunmap_trace(
374         xfs_inode_t             *ip,
375         xfs_fileoff_t           bno,
376         xfs_filblks_t           len,
377         int                     flags,
378         inst_t                  *ra);
379 #else
380 #define xfs_bunmap_trace(ip, bno, len, flags, ra)
381 #endif  /* XFS_RW_TRACE */
382
383 STATIC int
384 xfs_bmap_count_tree(
385         xfs_mount_t     *mp,
386         xfs_trans_t     *tp,
387         xfs_ifork_t     *ifp,
388         xfs_fsblock_t   blockno,
389         int             levelin,
390         int             *count);
391
392 STATIC int
393 xfs_bmap_count_leaves(
394         xfs_ifork_t             *ifp,
395         xfs_extnum_t            idx,
396         int                     numrecs,
397         int                     *count);
398
399 STATIC int
400 xfs_bmap_disk_count_leaves(
401         xfs_extnum_t            idx,
402         xfs_bmbt_block_t        *block,
403         int                     numrecs,
404         int                     *count);
405
406 /*
407  * Bmap internal routines.
408  */
409
410 /*
411  * Called from xfs_bmap_add_attrfork to handle btree format files.
412  */
413 STATIC int                                      /* error */
414 xfs_bmap_add_attrfork_btree(
415         xfs_trans_t             *tp,            /* transaction pointer */
416         xfs_inode_t             *ip,            /* incore inode pointer */
417         xfs_fsblock_t           *firstblock,    /* first block allocated */
418         xfs_bmap_free_t         *flist,         /* blocks to free at commit */
419         int                     *flags)         /* inode logging flags */
420 {
421         xfs_btree_cur_t         *cur;           /* btree cursor */
422         int                     error;          /* error return value */
423         xfs_mount_t             *mp;            /* file system mount struct */
424         int                     stat;           /* newroot status */
425
426         mp = ip->i_mount;
427         if (ip->i_df.if_broot_bytes <= XFS_IFORK_DSIZE(ip))
428                 *flags |= XFS_ILOG_DBROOT;
429         else {
430                 cur = xfs_btree_init_cursor(mp, tp, NULL, 0, XFS_BTNUM_BMAP, ip,
431                         XFS_DATA_FORK);
432                 cur->bc_private.b.flist = flist;
433                 cur->bc_private.b.firstblock = *firstblock;
434                 if ((error = xfs_bmbt_lookup_ge(cur, 0, 0, 0, &stat)))
435                         goto error0;
436                 ASSERT(stat == 1);      /* must be at least one entry */
437                 if ((error = xfs_bmbt_newroot(cur, flags, &stat)))
438                         goto error0;
439                 if (stat == 0) {
440                         xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
441                         return XFS_ERROR(ENOSPC);
442                 }
443                 *firstblock = cur->bc_private.b.firstblock;
444                 cur->bc_private.b.allocated = 0;
445                 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
446         }
447         return 0;
448 error0:
449         xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
450         return error;
451 }
452
453 /*
454  * Called from xfs_bmap_add_attrfork to handle extents format files.
455  */
456 STATIC int                                      /* error */
457 xfs_bmap_add_attrfork_extents(
458         xfs_trans_t             *tp,            /* transaction pointer */
459         xfs_inode_t             *ip,            /* incore inode pointer */
460         xfs_fsblock_t           *firstblock,    /* first block allocated */
461         xfs_bmap_free_t         *flist,         /* blocks to free at commit */
462         int                     *flags)         /* inode logging flags */
463 {
464         xfs_btree_cur_t         *cur;           /* bmap btree cursor */
465         int                     error;          /* error return value */
466
467         if (ip->i_d.di_nextents * sizeof(xfs_bmbt_rec_t) <= XFS_IFORK_DSIZE(ip))
468                 return 0;
469         cur = NULL;
470         error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist, &cur, 0,
471                 flags, XFS_DATA_FORK);
472         if (cur) {
473                 cur->bc_private.b.allocated = 0;
474                 xfs_btree_del_cursor(cur,
475                         error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
476         }
477         return error;
478 }
479
480 /*
481  * Called from xfs_bmap_add_attrfork to handle local format files.
482  */
483 STATIC int                                      /* error */
484 xfs_bmap_add_attrfork_local(
485         xfs_trans_t             *tp,            /* transaction pointer */
486         xfs_inode_t             *ip,            /* incore inode pointer */
487         xfs_fsblock_t           *firstblock,    /* first block allocated */
488         xfs_bmap_free_t         *flist,         /* blocks to free at commit */
489         int                     *flags)         /* inode logging flags */
490 {
491         xfs_da_args_t           dargs;          /* args for dir/attr code */
492         int                     error;          /* error return value */
493         xfs_mount_t             *mp;            /* mount structure pointer */
494
495         if (ip->i_df.if_bytes <= XFS_IFORK_DSIZE(ip))
496                 return 0;
497         if ((ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
498                 mp = ip->i_mount;
499                 memset(&dargs, 0, sizeof(dargs));
500                 dargs.dp = ip;
501                 dargs.firstblock = firstblock;
502                 dargs.flist = flist;
503                 dargs.total = mp->m_dirblkfsbs;
504                 dargs.whichfork = XFS_DATA_FORK;
505                 dargs.trans = tp;
506                 error = xfs_dir2_sf_to_block(&dargs);
507         } else
508                 error = xfs_bmap_local_to_extents(tp, ip, firstblock, 1, flags,
509                         XFS_DATA_FORK);
510         return error;
511 }
512
513 /*
514  * Called by xfs_bmapi to update file extent records and the btree
515  * after allocating space (or doing a delayed allocation).
516  */
517 STATIC int                              /* error */
518 xfs_bmap_add_extent(
519         xfs_inode_t             *ip,    /* incore inode pointer */
520         xfs_extnum_t            idx,    /* extent number to update/insert */
521         xfs_btree_cur_t         **curp, /* if *curp is null, not a btree */
522         xfs_bmbt_irec_t         *new,   /* new data to add to file extents */
523         xfs_fsblock_t           *first, /* pointer to firstblock variable */
524         xfs_bmap_free_t         *flist, /* list of extents to be freed */
525         int                     *logflagsp, /* inode logging flags */
526         xfs_extdelta_t          *delta, /* Change made to incore extents */
527         int                     whichfork, /* data or attr fork */
528         int                     rsvd)   /* OK to use reserved data blocks */
529 {
530         xfs_btree_cur_t         *cur;   /* btree cursor or null */
531         xfs_filblks_t           da_new; /* new count del alloc blocks used */
532         xfs_filblks_t           da_old; /* old count del alloc blocks used */
533         int                     error;  /* error return value */
534 #ifdef XFS_BMAP_TRACE
535         static char             fname[] = "xfs_bmap_add_extent";
536 #endif
537         xfs_ifork_t             *ifp;   /* inode fork ptr */
538         int                     logflags; /* returned value */
539         xfs_extnum_t            nextents; /* number of extents in file now */
540
541         XFS_STATS_INC(xs_add_exlist);
542         cur = *curp;
543         ifp = XFS_IFORK_PTR(ip, whichfork);
544         nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
545         ASSERT(idx <= nextents);
546         da_old = da_new = 0;
547         error = 0;
548         /*
549          * This is the first extent added to a new/empty file.
550          * Special case this one, so other routines get to assume there are
551          * already extents in the list.
552          */
553         if (nextents == 0) {
554                 xfs_bmap_trace_insert(fname, "insert empty", ip, 0, 1, new,
555                         NULL, whichfork);
556                 xfs_iext_insert(ifp, 0, 1, new);
557                 ASSERT(cur == NULL);
558                 ifp->if_lastex = 0;
559                 if (!ISNULLSTARTBLOCK(new->br_startblock)) {
560                         XFS_IFORK_NEXT_SET(ip, whichfork, 1);
561                         logflags = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
562                 } else
563                         logflags = 0;
564                 /* DELTA: single new extent */
565                 if (delta) {
566                         if (delta->xed_startoff > new->br_startoff)
567                                 delta->xed_startoff = new->br_startoff;
568                         if (delta->xed_blockcount <
569                                         new->br_startoff + new->br_blockcount)
570                                 delta->xed_blockcount = new->br_startoff +
571                                                 new->br_blockcount;
572                 }
573         }
574         /*
575          * Any kind of new delayed allocation goes here.
576          */
577         else if (ISNULLSTARTBLOCK(new->br_startblock)) {
578                 if (cur)
579                         ASSERT((cur->bc_private.b.flags &
580                                 XFS_BTCUR_BPRV_WASDEL) == 0);
581                 if ((error = xfs_bmap_add_extent_hole_delay(ip, idx, new,
582                                 &logflags, delta, rsvd)))
583                         goto done;
584         }
585         /*
586          * Real allocation off the end of the file.
587          */
588         else if (idx == nextents) {
589                 if (cur)
590                         ASSERT((cur->bc_private.b.flags &
591                                 XFS_BTCUR_BPRV_WASDEL) == 0);
592                 if ((error = xfs_bmap_add_extent_hole_real(ip, idx, cur, new,
593                                 &logflags, delta, whichfork)))
594                         goto done;
595         } else {
596                 xfs_bmbt_irec_t prev;   /* old extent at offset idx */
597
598                 /*
599                  * Get the record referred to by idx.
600                  */
601                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx), &prev);
602                 /*
603                  * If it's a real allocation record, and the new allocation ends
604                  * after the start of the referred to record, then we're filling
605                  * in a delayed or unwritten allocation with a real one, or
606                  * converting real back to unwritten.
607                  */
608                 if (!ISNULLSTARTBLOCK(new->br_startblock) &&
609                     new->br_startoff + new->br_blockcount > prev.br_startoff) {
610                         if (prev.br_state != XFS_EXT_UNWRITTEN &&
611                             ISNULLSTARTBLOCK(prev.br_startblock)) {
612                                 da_old = STARTBLOCKVAL(prev.br_startblock);
613                                 if (cur)
614                                         ASSERT(cur->bc_private.b.flags &
615                                                 XFS_BTCUR_BPRV_WASDEL);
616                                 if ((error = xfs_bmap_add_extent_delay_real(ip,
617                                         idx, &cur, new, &da_new, first, flist,
618                                         &logflags, delta, rsvd)))
619                                         goto done;
620                         } else if (new->br_state == XFS_EXT_NORM) {
621                                 ASSERT(new->br_state == XFS_EXT_NORM);
622                                 if ((error = xfs_bmap_add_extent_unwritten_real(
623                                         ip, idx, &cur, new, &logflags, delta)))
624                                         goto done;
625                         } else {
626                                 ASSERT(new->br_state == XFS_EXT_UNWRITTEN);
627                                 if ((error = xfs_bmap_add_extent_unwritten_real(
628                                         ip, idx, &cur, new, &logflags, delta)))
629                                         goto done;
630                         }
631                         ASSERT(*curp == cur || *curp == NULL);
632                 }
633                 /*
634                  * Otherwise we're filling in a hole with an allocation.
635                  */
636                 else {
637                         if (cur)
638                                 ASSERT((cur->bc_private.b.flags &
639                                         XFS_BTCUR_BPRV_WASDEL) == 0);
640                         if ((error = xfs_bmap_add_extent_hole_real(ip, idx, cur,
641                                         new, &logflags, delta, whichfork)))
642                                 goto done;
643                 }
644         }
645
646         ASSERT(*curp == cur || *curp == NULL);
647         /*
648          * Convert to a btree if necessary.
649          */
650         if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
651             XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max) {
652                 int     tmp_logflags;   /* partial log flag return val */
653
654                 ASSERT(cur == NULL);
655                 error = xfs_bmap_extents_to_btree(ip->i_transp, ip, first,
656                         flist, &cur, da_old > 0, &tmp_logflags, whichfork);
657                 logflags |= tmp_logflags;
658                 if (error)
659                         goto done;
660         }
661         /*
662          * Adjust for changes in reserved delayed indirect blocks.
663          * Nothing to do for disk quotas here.
664          */
665         if (da_old || da_new) {
666                 xfs_filblks_t   nblks;
667
668                 nblks = da_new;
669                 if (cur)
670                         nblks += cur->bc_private.b.allocated;
671                 ASSERT(nblks <= da_old);
672                 if (nblks < da_old)
673                         xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS,
674                                 (int64_t)(da_old - nblks), rsvd);
675         }
676         /*
677          * Clear out the allocated field, done with it now in any case.
678          */
679         if (cur) {
680                 cur->bc_private.b.allocated = 0;
681                 *curp = cur;
682         }
683 done:
684 #ifdef DEBUG
685         if (!error)
686                 xfs_bmap_check_leaf_extents(*curp, ip, whichfork);
687 #endif
688         *logflagsp = logflags;
689         return error;
690 }
691
692 /*
693  * Called by xfs_bmap_add_extent to handle cases converting a delayed
694  * allocation to a real allocation.
695  */
696 STATIC int                              /* error */
697 xfs_bmap_add_extent_delay_real(
698         xfs_inode_t             *ip,    /* incore inode pointer */
699         xfs_extnum_t            idx,    /* extent number to update/insert */
700         xfs_btree_cur_t         **curp, /* if *curp is null, not a btree */
701         xfs_bmbt_irec_t         *new,   /* new data to add to file extents */
702         xfs_filblks_t           *dnew,  /* new delayed-alloc indirect blocks */
703         xfs_fsblock_t           *first, /* pointer to firstblock variable */
704         xfs_bmap_free_t         *flist, /* list of extents to be freed */
705         int                     *logflagsp, /* inode logging flags */
706         xfs_extdelta_t          *delta, /* Change made to incore extents */
707         int                     rsvd)   /* OK to use reserved data block allocation */
708 {
709         xfs_btree_cur_t         *cur;   /* btree cursor */
710         int                     diff;   /* temp value */
711         xfs_bmbt_rec_t          *ep;    /* extent entry for idx */
712         int                     error;  /* error return value */
713 #ifdef XFS_BMAP_TRACE
714         static char             fname[] = "xfs_bmap_add_extent_delay_real";
715 #endif
716         int                     i;      /* temp state */
717         xfs_ifork_t             *ifp;   /* inode fork pointer */
718         xfs_fileoff_t           new_endoff;     /* end offset of new entry */
719         xfs_bmbt_irec_t         r[3];   /* neighbor extent entries */
720                                         /* left is 0, right is 1, prev is 2 */
721         int                     rval=0; /* return value (logging flags) */
722         int                     state = 0;/* state bits, accessed thru macros */
723         xfs_filblks_t           temp=0; /* value for dnew calculations */
724         xfs_filblks_t           temp2=0;/* value for dnew calculations */
725         int                     tmp_rval;       /* partial logging flags */
726         enum {                          /* bit number definitions for state */
727                 LEFT_CONTIG,    RIGHT_CONTIG,
728                 LEFT_FILLING,   RIGHT_FILLING,
729                 LEFT_DELAY,     RIGHT_DELAY,
730                 LEFT_VALID,     RIGHT_VALID
731         };
732
733 #define LEFT            r[0]
734 #define RIGHT           r[1]
735 #define PREV            r[2]
736 #define MASK(b)         (1 << (b))
737 #define MASK2(a,b)      (MASK(a) | MASK(b))
738 #define MASK3(a,b,c)    (MASK2(a,b) | MASK(c))
739 #define MASK4(a,b,c,d)  (MASK3(a,b,c) | MASK(d))
740 #define STATE_SET(b,v)  ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
741 #define STATE_TEST(b)   (state & MASK(b))
742 #define STATE_SET_TEST(b,v)     ((v) ? ((state |= MASK(b)), 1) : \
743                                        ((state &= ~MASK(b)), 0))
744 #define SWITCH_STATE            \
745         (state & MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG))
746
747         /*
748          * Set up a bunch of variables to make the tests simpler.
749          */
750         cur = *curp;
751         ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
752         ep = xfs_iext_get_ext(ifp, idx);
753         xfs_bmbt_get_all(ep, &PREV);
754         new_endoff = new->br_startoff + new->br_blockcount;
755         ASSERT(PREV.br_startoff <= new->br_startoff);
756         ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
757         /*
758          * Set flags determining what part of the previous delayed allocation
759          * extent is being replaced by a real allocation.
760          */
761         STATE_SET(LEFT_FILLING, PREV.br_startoff == new->br_startoff);
762         STATE_SET(RIGHT_FILLING,
763                 PREV.br_startoff + PREV.br_blockcount == new_endoff);
764         /*
765          * Check and set flags if this segment has a left neighbor.
766          * Don't set contiguous if the combined extent would be too large.
767          */
768         if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
769                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx - 1), &LEFT);
770                 STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(LEFT.br_startblock));
771         }
772         STATE_SET(LEFT_CONTIG,
773                 STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
774                 LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
775                 LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
776                 LEFT.br_state == new->br_state &&
777                 LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN);
778         /*
779          * Check and set flags if this segment has a right neighbor.
780          * Don't set contiguous if the combined extent would be too large.
781          * Also check for all-three-contiguous being too large.
782          */
783         if (STATE_SET_TEST(RIGHT_VALID,
784                         idx <
785                         ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1)) {
786                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx + 1), &RIGHT);
787                 STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(RIGHT.br_startblock));
788         }
789         STATE_SET(RIGHT_CONTIG,
790                 STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
791                 new_endoff == RIGHT.br_startoff &&
792                 new->br_startblock + new->br_blockcount ==
793                     RIGHT.br_startblock &&
794                 new->br_state == RIGHT.br_state &&
795                 new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
796                 ((state & MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING)) !=
797                   MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING) ||
798                  LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
799                      <= MAXEXTLEN));
800         error = 0;
801         /*
802          * Switch out based on the FILLING and CONTIG state bits.
803          */
804         switch (SWITCH_STATE) {
805
806         case MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
807                 /*
808                  * Filling in all of a previously delayed allocation extent.
809                  * The left and right neighbors are both contiguous with new.
810                  */
811                 xfs_bmap_trace_pre_update(fname, "LF|RF|LC|RC", ip, idx - 1,
812                         XFS_DATA_FORK);
813                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
814                         LEFT.br_blockcount + PREV.br_blockcount +
815                         RIGHT.br_blockcount);
816                 xfs_bmap_trace_post_update(fname, "LF|RF|LC|RC", ip, idx - 1,
817                         XFS_DATA_FORK);
818                 xfs_bmap_trace_delete(fname, "LF|RF|LC|RC", ip, idx, 2,
819                         XFS_DATA_FORK);
820                 xfs_iext_remove(ifp, idx, 2);
821                 ip->i_df.if_lastex = idx - 1;
822                 ip->i_d.di_nextents--;
823                 if (cur == NULL)
824                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
825                 else {
826                         rval = XFS_ILOG_CORE;
827                         if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
828                                         RIGHT.br_startblock,
829                                         RIGHT.br_blockcount, &i)))
830                                 goto done;
831                         ASSERT(i == 1);
832                         if ((error = xfs_bmbt_delete(cur, &i)))
833                                 goto done;
834                         ASSERT(i == 1);
835                         if ((error = xfs_bmbt_decrement(cur, 0, &i)))
836                                 goto done;
837                         ASSERT(i == 1);
838                         if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
839                                         LEFT.br_startblock,
840                                         LEFT.br_blockcount +
841                                         PREV.br_blockcount +
842                                         RIGHT.br_blockcount, LEFT.br_state)))
843                                 goto done;
844                 }
845                 *dnew = 0;
846                 /* DELTA: Three in-core extents are replaced by one. */
847                 temp = LEFT.br_startoff;
848                 temp2 = LEFT.br_blockcount +
849                         PREV.br_blockcount +
850                         RIGHT.br_blockcount;
851                 break;
852
853         case MASK3(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG):
854                 /*
855                  * Filling in all of a previously delayed allocation extent.
856                  * The left neighbor is contiguous, the right is not.
857                  */
858                 xfs_bmap_trace_pre_update(fname, "LF|RF|LC", ip, idx - 1,
859                         XFS_DATA_FORK);
860                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
861                         LEFT.br_blockcount + PREV.br_blockcount);
862                 xfs_bmap_trace_post_update(fname, "LF|RF|LC", ip, idx - 1,
863                         XFS_DATA_FORK);
864                 ip->i_df.if_lastex = idx - 1;
865                 xfs_bmap_trace_delete(fname, "LF|RF|LC", ip, idx, 1,
866                         XFS_DATA_FORK);
867                 xfs_iext_remove(ifp, idx, 1);
868                 if (cur == NULL)
869                         rval = XFS_ILOG_DEXT;
870                 else {
871                         rval = 0;
872                         if ((error = xfs_bmbt_lookup_eq(cur, LEFT.br_startoff,
873                                         LEFT.br_startblock, LEFT.br_blockcount,
874                                         &i)))
875                                 goto done;
876                         ASSERT(i == 1);
877                         if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
878                                         LEFT.br_startblock,
879                                         LEFT.br_blockcount +
880                                         PREV.br_blockcount, LEFT.br_state)))
881                                 goto done;
882                 }
883                 *dnew = 0;
884                 /* DELTA: Two in-core extents are replaced by one. */
885                 temp = LEFT.br_startoff;
886                 temp2 = LEFT.br_blockcount +
887                         PREV.br_blockcount;
888                 break;
889
890         case MASK3(LEFT_FILLING, RIGHT_FILLING, RIGHT_CONTIG):
891                 /*
892                  * Filling in all of a previously delayed allocation extent.
893                  * The right neighbor is contiguous, the left is not.
894                  */
895                 xfs_bmap_trace_pre_update(fname, "LF|RF|RC", ip, idx,
896                         XFS_DATA_FORK);
897                 xfs_bmbt_set_startblock(ep, new->br_startblock);
898                 xfs_bmbt_set_blockcount(ep,
899                         PREV.br_blockcount + RIGHT.br_blockcount);
900                 xfs_bmap_trace_post_update(fname, "LF|RF|RC", ip, idx,
901                         XFS_DATA_FORK);
902                 ip->i_df.if_lastex = idx;
903                 xfs_bmap_trace_delete(fname, "LF|RF|RC", ip, idx + 1, 1,
904                         XFS_DATA_FORK);
905                 xfs_iext_remove(ifp, idx + 1, 1);
906                 if (cur == NULL)
907                         rval = XFS_ILOG_DEXT;
908                 else {
909                         rval = 0;
910                         if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
911                                         RIGHT.br_startblock,
912                                         RIGHT.br_blockcount, &i)))
913                                 goto done;
914                         ASSERT(i == 1);
915                         if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
916                                         new->br_startblock,
917                                         PREV.br_blockcount +
918                                         RIGHT.br_blockcount, PREV.br_state)))
919                                 goto done;
920                 }
921                 *dnew = 0;
922                 /* DELTA: Two in-core extents are replaced by one. */
923                 temp = PREV.br_startoff;
924                 temp2 = PREV.br_blockcount +
925                         RIGHT.br_blockcount;
926                 break;
927
928         case MASK2(LEFT_FILLING, RIGHT_FILLING):
929                 /*
930                  * Filling in all of a previously delayed allocation extent.
931                  * Neither the left nor right neighbors are contiguous with
932                  * the new one.
933                  */
934                 xfs_bmap_trace_pre_update(fname, "LF|RF", ip, idx,
935                         XFS_DATA_FORK);
936                 xfs_bmbt_set_startblock(ep, new->br_startblock);
937                 xfs_bmap_trace_post_update(fname, "LF|RF", ip, idx,
938                         XFS_DATA_FORK);
939                 ip->i_df.if_lastex = idx;
940                 ip->i_d.di_nextents++;
941                 if (cur == NULL)
942                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
943                 else {
944                         rval = XFS_ILOG_CORE;
945                         if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
946                                         new->br_startblock, new->br_blockcount,
947                                         &i)))
948                                 goto done;
949                         ASSERT(i == 0);
950                         cur->bc_rec.b.br_state = XFS_EXT_NORM;
951                         if ((error = xfs_bmbt_insert(cur, &i)))
952                                 goto done;
953                         ASSERT(i == 1);
954                 }
955                 *dnew = 0;
956                 /* DELTA: The in-core extent described by new changed type. */
957                 temp = new->br_startoff;
958                 temp2 = new->br_blockcount;
959                 break;
960
961         case MASK2(LEFT_FILLING, LEFT_CONTIG):
962                 /*
963                  * Filling in the first part of a previous delayed allocation.
964                  * The left neighbor is contiguous.
965                  */
966                 xfs_bmap_trace_pre_update(fname, "LF|LC", ip, idx - 1,
967                         XFS_DATA_FORK);
968                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
969                         LEFT.br_blockcount + new->br_blockcount);
970                 xfs_bmbt_set_startoff(ep,
971                         PREV.br_startoff + new->br_blockcount);
972                 xfs_bmap_trace_post_update(fname, "LF|LC", ip, idx - 1,
973                         XFS_DATA_FORK);
974                 temp = PREV.br_blockcount - new->br_blockcount;
975                 xfs_bmap_trace_pre_update(fname, "LF|LC", ip, idx,
976                         XFS_DATA_FORK);
977                 xfs_bmbt_set_blockcount(ep, temp);
978                 ip->i_df.if_lastex = idx - 1;
979                 if (cur == NULL)
980                         rval = XFS_ILOG_DEXT;
981                 else {
982                         rval = 0;
983                         if ((error = xfs_bmbt_lookup_eq(cur, LEFT.br_startoff,
984                                         LEFT.br_startblock, LEFT.br_blockcount,
985                                         &i)))
986                                 goto done;
987                         ASSERT(i == 1);
988                         if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
989                                         LEFT.br_startblock,
990                                         LEFT.br_blockcount +
991                                         new->br_blockcount,
992                                         LEFT.br_state)))
993                                 goto done;
994                 }
995                 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
996                         STARTBLOCKVAL(PREV.br_startblock));
997                 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
998                 xfs_bmap_trace_post_update(fname, "LF|LC", ip, idx,
999                         XFS_DATA_FORK);
1000                 *dnew = temp;
1001                 /* DELTA: The boundary between two in-core extents moved. */
1002                 temp = LEFT.br_startoff;
1003                 temp2 = LEFT.br_blockcount +
1004                         PREV.br_blockcount;
1005                 break;
1006
1007         case MASK(LEFT_FILLING):
1008                 /*
1009                  * Filling in the first part of a previous delayed allocation.
1010                  * The left neighbor is not contiguous.
1011                  */
1012                 xfs_bmap_trace_pre_update(fname, "LF", ip, idx, XFS_DATA_FORK);
1013                 xfs_bmbt_set_startoff(ep, new_endoff);
1014                 temp = PREV.br_blockcount - new->br_blockcount;
1015                 xfs_bmbt_set_blockcount(ep, temp);
1016                 xfs_bmap_trace_insert(fname, "LF", ip, idx, 1, new, NULL,
1017                         XFS_DATA_FORK);
1018                 xfs_iext_insert(ifp, idx, 1, new);
1019                 ip->i_df.if_lastex = idx;
1020                 ip->i_d.di_nextents++;
1021                 if (cur == NULL)
1022                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1023                 else {
1024                         rval = XFS_ILOG_CORE;
1025                         if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1026                                         new->br_startblock, new->br_blockcount,
1027                                         &i)))
1028                                 goto done;
1029                         ASSERT(i == 0);
1030                         cur->bc_rec.b.br_state = XFS_EXT_NORM;
1031                         if ((error = xfs_bmbt_insert(cur, &i)))
1032                                 goto done;
1033                         ASSERT(i == 1);
1034                 }
1035                 if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
1036                     ip->i_d.di_nextents > ip->i_df.if_ext_max) {
1037                         error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
1038                                         first, flist, &cur, 1, &tmp_rval,
1039                                         XFS_DATA_FORK);
1040                         rval |= tmp_rval;
1041                         if (error)
1042                                 goto done;
1043                 }
1044                 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
1045                         STARTBLOCKVAL(PREV.br_startblock) -
1046                         (cur ? cur->bc_private.b.allocated : 0));
1047                 ep = xfs_iext_get_ext(ifp, idx + 1);
1048                 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
1049                 xfs_bmap_trace_post_update(fname, "LF", ip, idx + 1,
1050                         XFS_DATA_FORK);
1051                 *dnew = temp;
1052                 /* DELTA: One in-core extent is split in two. */
1053                 temp = PREV.br_startoff;
1054                 temp2 = PREV.br_blockcount;
1055                 break;
1056
1057         case MASK2(RIGHT_FILLING, RIGHT_CONTIG):
1058                 /*
1059                  * Filling in the last part of a previous delayed allocation.
1060                  * The right neighbor is contiguous with the new allocation.
1061                  */
1062                 temp = PREV.br_blockcount - new->br_blockcount;
1063                 xfs_bmap_trace_pre_update(fname, "RF|RC", ip, idx,
1064                         XFS_DATA_FORK);
1065                 xfs_bmap_trace_pre_update(fname, "RF|RC", ip, idx + 1,
1066                         XFS_DATA_FORK);
1067                 xfs_bmbt_set_blockcount(ep, temp);
1068                 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, idx + 1),
1069                         new->br_startoff, new->br_startblock,
1070                         new->br_blockcount + RIGHT.br_blockcount,
1071                         RIGHT.br_state);
1072                 xfs_bmap_trace_post_update(fname, "RF|RC", ip, idx + 1,
1073                         XFS_DATA_FORK);
1074                 ip->i_df.if_lastex = idx + 1;
1075                 if (cur == NULL)
1076                         rval = XFS_ILOG_DEXT;
1077                 else {
1078                         rval = 0;
1079                         if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1080                                         RIGHT.br_startblock,
1081                                         RIGHT.br_blockcount, &i)))
1082                                 goto done;
1083                         ASSERT(i == 1);
1084                         if ((error = xfs_bmbt_update(cur, new->br_startoff,
1085                                         new->br_startblock,
1086                                         new->br_blockcount +
1087                                         RIGHT.br_blockcount,
1088                                         RIGHT.br_state)))
1089                                 goto done;
1090                 }
1091                 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
1092                         STARTBLOCKVAL(PREV.br_startblock));
1093                 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
1094                 xfs_bmap_trace_post_update(fname, "RF|RC", ip, idx,
1095                         XFS_DATA_FORK);
1096                 *dnew = temp;
1097                 /* DELTA: The boundary between two in-core extents moved. */
1098                 temp = PREV.br_startoff;
1099                 temp2 = PREV.br_blockcount +
1100                         RIGHT.br_blockcount;
1101                 break;
1102
1103         case MASK(RIGHT_FILLING):
1104                 /*
1105                  * Filling in the last part of a previous delayed allocation.
1106                  * The right neighbor is not contiguous.
1107                  */
1108                 temp = PREV.br_blockcount - new->br_blockcount;
1109                 xfs_bmap_trace_pre_update(fname, "RF", ip, idx, XFS_DATA_FORK);
1110                 xfs_bmbt_set_blockcount(ep, temp);
1111                 xfs_bmap_trace_insert(fname, "RF", ip, idx + 1, 1,
1112                         new, NULL, XFS_DATA_FORK);
1113                 xfs_iext_insert(ifp, idx + 1, 1, new);
1114                 ip->i_df.if_lastex = idx + 1;
1115                 ip->i_d.di_nextents++;
1116                 if (cur == NULL)
1117                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1118                 else {
1119                         rval = XFS_ILOG_CORE;
1120                         if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1121                                         new->br_startblock, new->br_blockcount,
1122                                         &i)))
1123                                 goto done;
1124                         ASSERT(i == 0);
1125                         cur->bc_rec.b.br_state = XFS_EXT_NORM;
1126                         if ((error = xfs_bmbt_insert(cur, &i)))
1127                                 goto done;
1128                         ASSERT(i == 1);
1129                 }
1130                 if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
1131                     ip->i_d.di_nextents > ip->i_df.if_ext_max) {
1132                         error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
1133                                 first, flist, &cur, 1, &tmp_rval,
1134                                 XFS_DATA_FORK);
1135                         rval |= tmp_rval;
1136                         if (error)
1137                                 goto done;
1138                 }
1139                 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
1140                         STARTBLOCKVAL(PREV.br_startblock) -
1141                         (cur ? cur->bc_private.b.allocated : 0));
1142                 ep = xfs_iext_get_ext(ifp, idx);
1143                 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
1144                 xfs_bmap_trace_post_update(fname, "RF", ip, idx, XFS_DATA_FORK);
1145                 *dnew = temp;
1146                 /* DELTA: One in-core extent is split in two. */
1147                 temp = PREV.br_startoff;
1148                 temp2 = PREV.br_blockcount;
1149                 break;
1150
1151         case 0:
1152                 /*
1153                  * Filling in the middle part of a previous delayed allocation.
1154                  * Contiguity is impossible here.
1155                  * This case is avoided almost all the time.
1156                  */
1157                 temp = new->br_startoff - PREV.br_startoff;
1158                 xfs_bmap_trace_pre_update(fname, "0", ip, idx, XFS_DATA_FORK);
1159                 xfs_bmbt_set_blockcount(ep, temp);
1160                 r[0] = *new;
1161                 r[1].br_state = PREV.br_state;
1162                 r[1].br_startblock = 0;
1163                 r[1].br_startoff = new_endoff;
1164                 temp2 = PREV.br_startoff + PREV.br_blockcount - new_endoff;
1165                 r[1].br_blockcount = temp2;
1166                 xfs_bmap_trace_insert(fname, "0", ip, idx + 1, 2, &r[0], &r[1],
1167                         XFS_DATA_FORK);
1168                 xfs_iext_insert(ifp, idx + 1, 2, &r[0]);
1169                 ip->i_df.if_lastex = idx + 1;
1170                 ip->i_d.di_nextents++;
1171                 if (cur == NULL)
1172                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1173                 else {
1174                         rval = XFS_ILOG_CORE;
1175                         if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1176                                         new->br_startblock, new->br_blockcount,
1177                                         &i)))
1178                                 goto done;
1179                         ASSERT(i == 0);
1180                         cur->bc_rec.b.br_state = XFS_EXT_NORM;
1181                         if ((error = xfs_bmbt_insert(cur, &i)))
1182                                 goto done;
1183                         ASSERT(i == 1);
1184                 }
1185                 if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
1186                     ip->i_d.di_nextents > ip->i_df.if_ext_max) {
1187                         error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
1188                                         first, flist, &cur, 1, &tmp_rval,
1189                                         XFS_DATA_FORK);
1190                         rval |= tmp_rval;
1191                         if (error)
1192                                 goto done;
1193                 }
1194                 temp = xfs_bmap_worst_indlen(ip, temp);
1195                 temp2 = xfs_bmap_worst_indlen(ip, temp2);
1196                 diff = (int)(temp + temp2 - STARTBLOCKVAL(PREV.br_startblock) -
1197                         (cur ? cur->bc_private.b.allocated : 0));
1198                 if (diff > 0 &&
1199                     xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS, -((int64_t)diff), rsvd)) {
1200                         /*
1201                          * Ick gross gag me with a spoon.
1202                          */
1203                         ASSERT(0);      /* want to see if this ever happens! */
1204                         while (diff > 0) {
1205                                 if (temp) {
1206                                         temp--;
1207                                         diff--;
1208                                         if (!diff ||
1209                                             !xfs_mod_incore_sb(ip->i_mount,
1210                                                     XFS_SBS_FDBLOCKS, -((int64_t)diff), rsvd))
1211                                                 break;
1212                                 }
1213                                 if (temp2) {
1214                                         temp2--;
1215                                         diff--;
1216                                         if (!diff ||
1217                                             !xfs_mod_incore_sb(ip->i_mount,
1218                                                     XFS_SBS_FDBLOCKS, -((int64_t)diff), rsvd))
1219                                                 break;
1220                                 }
1221                         }
1222                 }
1223                 ep = xfs_iext_get_ext(ifp, idx);
1224                 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
1225                 xfs_bmap_trace_post_update(fname, "0", ip, idx, XFS_DATA_FORK);
1226                 xfs_bmap_trace_pre_update(fname, "0", ip, idx + 2,
1227                         XFS_DATA_FORK);
1228                 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, idx + 2),
1229                         NULLSTARTBLOCK((int)temp2));
1230                 xfs_bmap_trace_post_update(fname, "0", ip, idx + 2,
1231                         XFS_DATA_FORK);
1232                 *dnew = temp + temp2;
1233                 /* DELTA: One in-core extent is split in three. */
1234                 temp = PREV.br_startoff;
1235                 temp2 = PREV.br_blockcount;
1236                 break;
1237
1238         case MASK3(LEFT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
1239         case MASK3(RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
1240         case MASK2(LEFT_FILLING, RIGHT_CONTIG):
1241         case MASK2(RIGHT_FILLING, LEFT_CONTIG):
1242         case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
1243         case MASK(LEFT_CONTIG):
1244         case MASK(RIGHT_CONTIG):
1245                 /*
1246                  * These cases are all impossible.
1247                  */
1248                 ASSERT(0);
1249         }
1250         *curp = cur;
1251         if (delta) {
1252                 temp2 += temp;
1253                 if (delta->xed_startoff > temp)
1254                         delta->xed_startoff = temp;
1255                 if (delta->xed_blockcount < temp2)
1256                         delta->xed_blockcount = temp2;
1257         }
1258 done:
1259         *logflagsp = rval;
1260         return error;
1261 #undef  LEFT
1262 #undef  RIGHT
1263 #undef  PREV
1264 #undef  MASK
1265 #undef  MASK2
1266 #undef  MASK3
1267 #undef  MASK4
1268 #undef  STATE_SET
1269 #undef  STATE_TEST
1270 #undef  STATE_SET_TEST
1271 #undef  SWITCH_STATE
1272 }
1273
1274 /*
1275  * Called by xfs_bmap_add_extent to handle cases converting an unwritten
1276  * allocation to a real allocation or vice versa.
1277  */
1278 STATIC int                              /* error */
1279 xfs_bmap_add_extent_unwritten_real(
1280         xfs_inode_t             *ip,    /* incore inode pointer */
1281         xfs_extnum_t            idx,    /* extent number to update/insert */
1282         xfs_btree_cur_t         **curp, /* if *curp is null, not a btree */
1283         xfs_bmbt_irec_t         *new,   /* new data to add to file extents */
1284         int                     *logflagsp, /* inode logging flags */
1285         xfs_extdelta_t          *delta) /* Change made to incore extents */
1286 {
1287         xfs_btree_cur_t         *cur;   /* btree cursor */
1288         xfs_bmbt_rec_t          *ep;    /* extent entry for idx */
1289         int                     error;  /* error return value */
1290 #ifdef XFS_BMAP_TRACE
1291         static char             fname[] = "xfs_bmap_add_extent_unwritten_real";
1292 #endif
1293         int                     i;      /* temp state */
1294         xfs_ifork_t             *ifp;   /* inode fork pointer */
1295         xfs_fileoff_t           new_endoff;     /* end offset of new entry */
1296         xfs_exntst_t            newext; /* new extent state */
1297         xfs_exntst_t            oldext; /* old extent state */
1298         xfs_bmbt_irec_t         r[3];   /* neighbor extent entries */
1299                                         /* left is 0, right is 1, prev is 2 */
1300         int                     rval=0; /* return value (logging flags) */
1301         int                     state = 0;/* state bits, accessed thru macros */
1302         xfs_filblks_t           temp=0;
1303         xfs_filblks_t           temp2=0;
1304         enum {                          /* bit number definitions for state */
1305                 LEFT_CONTIG,    RIGHT_CONTIG,
1306                 LEFT_FILLING,   RIGHT_FILLING,
1307                 LEFT_DELAY,     RIGHT_DELAY,
1308                 LEFT_VALID,     RIGHT_VALID
1309         };
1310
1311 #define LEFT            r[0]
1312 #define RIGHT           r[1]
1313 #define PREV            r[2]
1314 #define MASK(b)         (1 << (b))
1315 #define MASK2(a,b)      (MASK(a) | MASK(b))
1316 #define MASK3(a,b,c)    (MASK2(a,b) | MASK(c))
1317 #define MASK4(a,b,c,d)  (MASK3(a,b,c) | MASK(d))
1318 #define STATE_SET(b,v)  ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
1319 #define STATE_TEST(b)   (state & MASK(b))
1320 #define STATE_SET_TEST(b,v)     ((v) ? ((state |= MASK(b)), 1) : \
1321                                        ((state &= ~MASK(b)), 0))
1322 #define SWITCH_STATE            \
1323         (state & MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG))
1324
1325         /*
1326          * Set up a bunch of variables to make the tests simpler.
1327          */
1328         error = 0;
1329         cur = *curp;
1330         ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1331         ep = xfs_iext_get_ext(ifp, idx);
1332         xfs_bmbt_get_all(ep, &PREV);
1333         newext = new->br_state;
1334         oldext = (newext == XFS_EXT_UNWRITTEN) ?
1335                 XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
1336         ASSERT(PREV.br_state == oldext);
1337         new_endoff = new->br_startoff + new->br_blockcount;
1338         ASSERT(PREV.br_startoff <= new->br_startoff);
1339         ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
1340         /*
1341          * Set flags determining what part of the previous oldext allocation
1342          * extent is being replaced by a newext allocation.
1343          */
1344         STATE_SET(LEFT_FILLING, PREV.br_startoff == new->br_startoff);
1345         STATE_SET(RIGHT_FILLING,
1346                 PREV.br_startoff + PREV.br_blockcount == new_endoff);
1347         /*
1348          * Check and set flags if this segment has a left neighbor.
1349          * Don't set contiguous if the combined extent would be too large.
1350          */
1351         if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
1352                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx - 1), &LEFT);
1353                 STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(LEFT.br_startblock));
1354         }
1355         STATE_SET(LEFT_CONTIG,
1356                 STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
1357                 LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
1358                 LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
1359                 LEFT.br_state == newext &&
1360                 LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN);
1361         /*
1362          * Check and set flags if this segment has a right neighbor.
1363          * Don't set contiguous if the combined extent would be too large.
1364          * Also check for all-three-contiguous being too large.
1365          */
1366         if (STATE_SET_TEST(RIGHT_VALID,
1367                         idx <
1368                         ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1)) {
1369                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx + 1), &RIGHT);
1370                 STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(RIGHT.br_startblock));
1371         }
1372         STATE_SET(RIGHT_CONTIG,
1373                 STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
1374                 new_endoff == RIGHT.br_startoff &&
1375                 new->br_startblock + new->br_blockcount ==
1376                     RIGHT.br_startblock &&
1377                 newext == RIGHT.br_state &&
1378                 new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
1379                 ((state & MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING)) !=
1380                   MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING) ||
1381                  LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
1382                      <= MAXEXTLEN));
1383         /*
1384          * Switch out based on the FILLING and CONTIG state bits.
1385          */
1386         switch (SWITCH_STATE) {
1387
1388         case MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
1389                 /*
1390                  * Setting all of a previous oldext extent to newext.
1391                  * The left and right neighbors are both contiguous with new.
1392                  */
1393                 xfs_bmap_trace_pre_update(fname, "LF|RF|LC|RC", ip, idx - 1,
1394                         XFS_DATA_FORK);
1395                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
1396                         LEFT.br_blockcount + PREV.br_blockcount +
1397                         RIGHT.br_blockcount);
1398                 xfs_bmap_trace_post_update(fname, "LF|RF|LC|RC", ip, idx - 1,
1399                         XFS_DATA_FORK);
1400                 xfs_bmap_trace_delete(fname, "LF|RF|LC|RC", ip, idx, 2,
1401                         XFS_DATA_FORK);
1402                 xfs_iext_remove(ifp, idx, 2);
1403                 ip->i_df.if_lastex = idx - 1;
1404                 ip->i_d.di_nextents -= 2;
1405                 if (cur == NULL)
1406                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1407                 else {
1408                         rval = XFS_ILOG_CORE;
1409                         if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1410                                         RIGHT.br_startblock,
1411                                         RIGHT.br_blockcount, &i)))
1412                                 goto done;
1413                         ASSERT(i == 1);
1414                         if ((error = xfs_bmbt_delete(cur, &i)))
1415                                 goto done;
1416                         ASSERT(i == 1);
1417                         if ((error = xfs_bmbt_decrement(cur, 0, &i)))
1418                                 goto done;
1419                         ASSERT(i == 1);
1420                         if ((error = xfs_bmbt_delete(cur, &i)))
1421                                 goto done;
1422                         ASSERT(i == 1);
1423                         if ((error = xfs_bmbt_decrement(cur, 0, &i)))
1424                                 goto done;
1425                         ASSERT(i == 1);
1426                         if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
1427                                 LEFT.br_startblock,
1428                                 LEFT.br_blockcount + PREV.br_blockcount +
1429                                 RIGHT.br_blockcount, LEFT.br_state)))
1430                                 goto done;
1431                 }
1432                 /* DELTA: Three in-core extents are replaced by one. */
1433                 temp = LEFT.br_startoff;
1434                 temp2 = LEFT.br_blockcount +
1435                         PREV.br_blockcount +
1436                         RIGHT.br_blockcount;
1437                 break;
1438
1439         case MASK3(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG):
1440                 /*
1441                  * Setting all of a previous oldext extent to newext.
1442                  * The left neighbor is contiguous, the right is not.
1443                  */
1444                 xfs_bmap_trace_pre_update(fname, "LF|RF|LC", ip, idx - 1,
1445                         XFS_DATA_FORK);
1446                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
1447                         LEFT.br_blockcount + PREV.br_blockcount);
1448                 xfs_bmap_trace_post_update(fname, "LF|RF|LC", ip, idx - 1,
1449                         XFS_DATA_FORK);
1450                 ip->i_df.if_lastex = idx - 1;
1451                 xfs_bmap_trace_delete(fname, "LF|RF|LC", ip, idx, 1,
1452                         XFS_DATA_FORK);
1453                 xfs_iext_remove(ifp, idx, 1);
1454                 ip->i_d.di_nextents--;
1455                 if (cur == NULL)
1456                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1457                 else {
1458                         rval = XFS_ILOG_CORE;
1459                         if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1460                                         PREV.br_startblock, PREV.br_blockcount,
1461                                         &i)))
1462                                 goto done;
1463                         ASSERT(i == 1);
1464                         if ((error = xfs_bmbt_delete(cur, &i)))
1465                                 goto done;
1466                         ASSERT(i == 1);
1467                         if ((error = xfs_bmbt_decrement(cur, 0, &i)))
1468                                 goto done;
1469                         ASSERT(i == 1);
1470                         if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
1471                                 LEFT.br_startblock,
1472                                 LEFT.br_blockcount + PREV.br_blockcount,
1473                                 LEFT.br_state)))
1474                                 goto done;
1475                 }
1476                 /* DELTA: Two in-core extents are replaced by one. */
1477                 temp = LEFT.br_startoff;
1478                 temp2 = LEFT.br_blockcount +
1479                         PREV.br_blockcount;
1480                 break;
1481
1482         case MASK3(LEFT_FILLING, RIGHT_FILLING, RIGHT_CONTIG):
1483                 /*
1484                  * Setting all of a previous oldext extent to newext.
1485                  * The right neighbor is contiguous, the left is not.
1486                  */
1487                 xfs_bmap_trace_pre_update(fname, "LF|RF|RC", ip, idx,
1488                         XFS_DATA_FORK);
1489                 xfs_bmbt_set_blockcount(ep,
1490                         PREV.br_blockcount + RIGHT.br_blockcount);
1491                 xfs_bmbt_set_state(ep, newext);
1492                 xfs_bmap_trace_post_update(fname, "LF|RF|RC", ip, idx,
1493                         XFS_DATA_FORK);
1494                 ip->i_df.if_lastex = idx;
1495                 xfs_bmap_trace_delete(fname, "LF|RF|RC", ip, idx + 1, 1,
1496                         XFS_DATA_FORK);
1497                 xfs_iext_remove(ifp, idx + 1, 1);
1498                 ip->i_d.di_nextents--;
1499                 if (cur == NULL)
1500                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1501                 else {
1502                         rval = XFS_ILOG_CORE;
1503                         if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1504                                         RIGHT.br_startblock,
1505                                         RIGHT.br_blockcount, &i)))
1506                                 goto done;
1507                         ASSERT(i == 1);
1508                         if ((error = xfs_bmbt_delete(cur, &i)))
1509                                 goto done;
1510                         ASSERT(i == 1);
1511                         if ((error = xfs_bmbt_decrement(cur, 0, &i)))
1512                                 goto done;
1513                         ASSERT(i == 1);
1514                         if ((error = xfs_bmbt_update(cur, new->br_startoff,
1515                                 new->br_startblock,
1516                                 new->br_blockcount + RIGHT.br_blockcount,
1517                                 newext)))
1518                                 goto done;
1519                 }
1520                 /* DELTA: Two in-core extents are replaced by one. */
1521                 temp = PREV.br_startoff;
1522                 temp2 = PREV.br_blockcount +
1523                         RIGHT.br_blockcount;
1524                 break;
1525
1526         case MASK2(LEFT_FILLING, RIGHT_FILLING):
1527                 /*
1528                  * Setting all of a previous oldext extent to newext.
1529                  * Neither the left nor right neighbors are contiguous with
1530                  * the new one.
1531                  */
1532                 xfs_bmap_trace_pre_update(fname, "LF|RF", ip, idx,
1533                         XFS_DATA_FORK);
1534                 xfs_bmbt_set_state(ep, newext);
1535                 xfs_bmap_trace_post_update(fname, "LF|RF", ip, idx,
1536                         XFS_DATA_FORK);
1537                 ip->i_df.if_lastex = idx;
1538                 if (cur == NULL)
1539                         rval = XFS_ILOG_DEXT;
1540                 else {
1541                         rval = 0;
1542                         if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1543                                         new->br_startblock, new->br_blockcount,
1544                                         &i)))
1545                                 goto done;
1546                         ASSERT(i == 1);
1547                         if ((error = xfs_bmbt_update(cur, new->br_startoff,
1548                                 new->br_startblock, new->br_blockcount,
1549                                 newext)))
1550                                 goto done;
1551                 }
1552                 /* DELTA: The in-core extent described by new changed type. */
1553                 temp = new->br_startoff;
1554                 temp2 = new->br_blockcount;
1555                 break;
1556
1557         case MASK2(LEFT_FILLING, LEFT_CONTIG):
1558                 /*
1559                  * Setting the first part of a previous oldext extent to newext.
1560                  * The left neighbor is contiguous.
1561                  */
1562                 xfs_bmap_trace_pre_update(fname, "LF|LC", ip, idx - 1,
1563                         XFS_DATA_FORK);
1564                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
1565                         LEFT.br_blockcount + new->br_blockcount);
1566                 xfs_bmbt_set_startoff(ep,
1567                         PREV.br_startoff + new->br_blockcount);
1568                 xfs_bmap_trace_post_update(fname, "LF|LC", ip, idx - 1,
1569                         XFS_DATA_FORK);
1570                 xfs_bmap_trace_pre_update(fname, "LF|LC", ip, idx,
1571                         XFS_DATA_FORK);
1572                 xfs_bmbt_set_startblock(ep,
1573                         new->br_startblock + new->br_blockcount);
1574                 xfs_bmbt_set_blockcount(ep,
1575                         PREV.br_blockcount - new->br_blockcount);
1576                 xfs_bmap_trace_post_update(fname, "LF|LC", ip, idx,
1577                         XFS_DATA_FORK);
1578                 ip->i_df.if_lastex = idx - 1;
1579                 if (cur == NULL)
1580                         rval = XFS_ILOG_DEXT;
1581                 else {
1582                         rval = 0;
1583                         if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1584                                         PREV.br_startblock, PREV.br_blockcount,
1585                                         &i)))
1586                                 goto done;
1587                         ASSERT(i == 1);
1588                         if ((error = xfs_bmbt_update(cur,
1589                                 PREV.br_startoff + new->br_blockcount,
1590                                 PREV.br_startblock + new->br_blockcount,
1591                                 PREV.br_blockcount - new->br_blockcount,
1592                                 oldext)))
1593                                 goto done;
1594                         if ((error = xfs_bmbt_decrement(cur, 0, &i)))
1595                                 goto done;
1596                         if (xfs_bmbt_update(cur, LEFT.br_startoff,
1597                                 LEFT.br_startblock,
1598                                 LEFT.br_blockcount + new->br_blockcount,
1599                                 LEFT.br_state))
1600                                 goto done;
1601                 }
1602                 /* DELTA: The boundary between two in-core extents moved. */
1603                 temp = LEFT.br_startoff;
1604                 temp2 = LEFT.br_blockcount +
1605                         PREV.br_blockcount;
1606                 break;
1607
1608         case MASK(LEFT_FILLING):
1609                 /*
1610                  * Setting the first part of a previous oldext extent to newext.
1611                  * The left neighbor is not contiguous.
1612                  */
1613                 xfs_bmap_trace_pre_update(fname, "LF", ip, idx, XFS_DATA_FORK);
1614                 ASSERT(ep && xfs_bmbt_get_state(ep) == oldext);
1615                 xfs_bmbt_set_startoff(ep, new_endoff);
1616                 xfs_bmbt_set_blockcount(ep,
1617                         PREV.br_blockcount - new->br_blockcount);
1618                 xfs_bmbt_set_startblock(ep,
1619                         new->br_startblock + new->br_blockcount);
1620                 xfs_bmap_trace_post_update(fname, "LF", ip, idx, XFS_DATA_FORK);
1621                 xfs_bmap_trace_insert(fname, "LF", ip, idx, 1, new, NULL,
1622                         XFS_DATA_FORK);
1623                 xfs_iext_insert(ifp, idx, 1, new);
1624                 ip->i_df.if_lastex = idx;
1625                 ip->i_d.di_nextents++;
1626                 if (cur == NULL)
1627                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1628                 else {
1629                         rval = XFS_ILOG_CORE;
1630                         if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1631                                         PREV.br_startblock, PREV.br_blockcount,
1632                                         &i)))
1633                                 goto done;
1634                         ASSERT(i == 1);
1635                         if ((error = xfs_bmbt_update(cur,
1636                                 PREV.br_startoff + new->br_blockcount,
1637                                 PREV.br_startblock + new->br_blockcount,
1638                                 PREV.br_blockcount - new->br_blockcount,
1639                                 oldext)))
1640                                 goto done;
1641                         cur->bc_rec.b = *new;
1642                         if ((error = xfs_bmbt_insert(cur, &i)))
1643                                 goto done;
1644                         ASSERT(i == 1);
1645                 }
1646                 /* DELTA: One in-core extent is split in two. */
1647                 temp = PREV.br_startoff;
1648                 temp2 = PREV.br_blockcount;
1649                 break;
1650
1651         case MASK2(RIGHT_FILLING, RIGHT_CONTIG):
1652                 /*
1653                  * Setting the last part of a previous oldext extent to newext.
1654                  * The right neighbor is contiguous with the new allocation.
1655                  */
1656                 xfs_bmap_trace_pre_update(fname, "RF|RC", ip, idx,
1657                         XFS_DATA_FORK);
1658                 xfs_bmap_trace_pre_update(fname, "RF|RC", ip, idx + 1,
1659                         XFS_DATA_FORK);
1660                 xfs_bmbt_set_blockcount(ep,
1661                         PREV.br_blockcount - new->br_blockcount);
1662                 xfs_bmap_trace_post_update(fname, "RF|RC", ip, idx,
1663                         XFS_DATA_FORK);
1664                 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, idx + 1),
1665                         new->br_startoff, new->br_startblock,
1666                         new->br_blockcount + RIGHT.br_blockcount, newext);
1667                 xfs_bmap_trace_post_update(fname, "RF|RC", ip, idx + 1,
1668                         XFS_DATA_FORK);
1669                 ip->i_df.if_lastex = idx + 1;
1670                 if (cur == NULL)
1671                         rval = XFS_ILOG_DEXT;
1672                 else {
1673                         rval = 0;
1674                         if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1675                                         PREV.br_startblock,
1676                                         PREV.br_blockcount, &i)))
1677                                 goto done;
1678                         ASSERT(i == 1);
1679                         if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
1680                                 PREV.br_startblock,
1681                                 PREV.br_blockcount - new->br_blockcount,
1682                                 oldext)))
1683                                 goto done;
1684                         if ((error = xfs_bmbt_increment(cur, 0, &i)))
1685                                 goto done;
1686                         if ((error = xfs_bmbt_update(cur, new->br_startoff,
1687                                 new->br_startblock,
1688                                 new->br_blockcount + RIGHT.br_blockcount,
1689                                 newext)))
1690                                 goto done;
1691                 }
1692                 /* DELTA: The boundary between two in-core extents moved. */
1693                 temp = PREV.br_startoff;
1694                 temp2 = PREV.br_blockcount +
1695                         RIGHT.br_blockcount;
1696                 break;
1697
1698         case MASK(RIGHT_FILLING):
1699                 /*
1700                  * Setting the last part of a previous oldext extent to newext.
1701                  * The right neighbor is not contiguous.
1702                  */
1703                 xfs_bmap_trace_pre_update(fname, "RF", ip, idx, XFS_DATA_FORK);
1704                 xfs_bmbt_set_blockcount(ep,
1705                         PREV.br_blockcount - new->br_blockcount);
1706                 xfs_bmap_trace_post_update(fname, "RF", ip, idx, XFS_DATA_FORK);
1707                 xfs_bmap_trace_insert(fname, "RF", ip, idx + 1, 1,
1708                         new, NULL, XFS_DATA_FORK);
1709                 xfs_iext_insert(ifp, idx + 1, 1, new);
1710                 ip->i_df.if_lastex = idx + 1;
1711                 ip->i_d.di_nextents++;
1712                 if (cur == NULL)
1713                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1714                 else {
1715                         rval = XFS_ILOG_CORE;
1716                         if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1717                                         PREV.br_startblock, PREV.br_blockcount,
1718                                         &i)))
1719                                 goto done;
1720                         ASSERT(i == 1);
1721                         if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
1722                                 PREV.br_startblock,
1723                                 PREV.br_blockcount - new->br_blockcount,
1724                                 oldext)))
1725                                 goto done;
1726                         if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1727                                         new->br_startblock, new->br_blockcount,
1728                                         &i)))
1729                                 goto done;
1730                         ASSERT(i == 0);
1731                         cur->bc_rec.b.br_state = XFS_EXT_NORM;
1732                         if ((error = xfs_bmbt_insert(cur, &i)))
1733                                 goto done;
1734                         ASSERT(i == 1);
1735                 }
1736                 /* DELTA: One in-core extent is split in two. */
1737                 temp = PREV.br_startoff;
1738                 temp2 = PREV.br_blockcount;
1739                 break;
1740
1741         case 0:
1742                 /*
1743                  * Setting the middle part of a previous oldext extent to
1744                  * newext.  Contiguity is impossible here.
1745                  * One extent becomes three extents.
1746                  */
1747                 xfs_bmap_trace_pre_update(fname, "0", ip, idx, XFS_DATA_FORK);
1748                 xfs_bmbt_set_blockcount(ep,
1749                         new->br_startoff - PREV.br_startoff);
1750                 xfs_bmap_trace_post_update(fname, "0", ip, idx, XFS_DATA_FORK);
1751                 r[0] = *new;
1752                 r[1].br_startoff = new_endoff;
1753                 r[1].br_blockcount =
1754                         PREV.br_startoff + PREV.br_blockcount - new_endoff;
1755                 r[1].br_startblock = new->br_startblock + new->br_blockcount;
1756                 r[1].br_state = oldext;
1757                 xfs_bmap_trace_insert(fname, "0", ip, idx + 1, 2, &r[0], &r[1],
1758                         XFS_DATA_FORK);
1759                 xfs_iext_insert(ifp, idx + 1, 2, &r[0]);
1760                 ip->i_df.if_lastex = idx + 1;
1761                 ip->i_d.di_nextents += 2;
1762                 if (cur == NULL)
1763                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1764                 else {
1765                         rval = XFS_ILOG_CORE;
1766                         if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1767                                         PREV.br_startblock, PREV.br_blockcount,
1768                                         &i)))
1769                                 goto done;
1770                         ASSERT(i == 1);
1771                         /* new right extent - oldext */
1772                         if ((error = xfs_bmbt_update(cur, r[1].br_startoff,
1773                                 r[1].br_startblock, r[1].br_blockcount,
1774                                 r[1].br_state)))
1775                                 goto done;
1776                         /* new left extent - oldext */
1777                         PREV.br_blockcount =
1778                                 new->br_startoff - PREV.br_startoff;
1779                         cur->bc_rec.b = PREV;
1780                         if ((error = xfs_bmbt_insert(cur, &i)))
1781                                 goto done;
1782                         ASSERT(i == 1);
1783                         if ((error = xfs_bmbt_increment(cur, 0, &i)))
1784                                 goto done;
1785                         ASSERT(i == 1);
1786                         /* new middle extent - newext */
1787                         cur->bc_rec.b = *new;
1788                         if ((error = xfs_bmbt_insert(cur, &i)))
1789                                 goto done;
1790                         ASSERT(i == 1);
1791                 }
1792                 /* DELTA: One in-core extent is split in three. */
1793                 temp = PREV.br_startoff;
1794                 temp2 = PREV.br_blockcount;
1795                 break;
1796
1797         case MASK3(LEFT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
1798         case MASK3(RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
1799         case MASK2(LEFT_FILLING, RIGHT_CONTIG):
1800         case MASK2(RIGHT_FILLING, LEFT_CONTIG):
1801         case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
1802         case MASK(LEFT_CONTIG):
1803         case MASK(RIGHT_CONTIG):
1804                 /*
1805                  * These cases are all impossible.
1806                  */
1807                 ASSERT(0);
1808         }
1809         *curp = cur;
1810         if (delta) {
1811                 temp2 += temp;
1812                 if (delta->xed_startoff > temp)
1813                         delta->xed_startoff = temp;
1814                 if (delta->xed_blockcount < temp2)
1815                         delta->xed_blockcount = temp2;
1816         }
1817 done:
1818         *logflagsp = rval;
1819         return error;
1820 #undef  LEFT
1821 #undef  RIGHT
1822 #undef  PREV
1823 #undef  MASK
1824 #undef  MASK2
1825 #undef  MASK3
1826 #undef  MASK4
1827 #undef  STATE_SET
1828 #undef  STATE_TEST
1829 #undef  STATE_SET_TEST
1830 #undef  SWITCH_STATE
1831 }
1832
1833 /*
1834  * Called by xfs_bmap_add_extent to handle cases converting a hole
1835  * to a delayed allocation.
1836  */
1837 /*ARGSUSED*/
1838 STATIC int                              /* error */
1839 xfs_bmap_add_extent_hole_delay(
1840         xfs_inode_t             *ip,    /* incore inode pointer */
1841         xfs_extnum_t            idx,    /* extent number to update/insert */
1842         xfs_bmbt_irec_t         *new,   /* new data to add to file extents */
1843         int                     *logflagsp, /* inode logging flags */
1844         xfs_extdelta_t          *delta, /* Change made to incore extents */
1845         int                     rsvd)           /* OK to allocate reserved blocks */
1846 {
1847         xfs_bmbt_rec_t          *ep;    /* extent record for idx */
1848 #ifdef XFS_BMAP_TRACE
1849         static char             fname[] = "xfs_bmap_add_extent_hole_delay";
1850 #endif
1851         xfs_ifork_t             *ifp;   /* inode fork pointer */
1852         xfs_bmbt_irec_t         left;   /* left neighbor extent entry */
1853         xfs_filblks_t           newlen=0;       /* new indirect size */
1854         xfs_filblks_t           oldlen=0;       /* old indirect size */
1855         xfs_bmbt_irec_t         right;  /* right neighbor extent entry */
1856         int                     state;  /* state bits, accessed thru macros */
1857         xfs_filblks_t           temp=0; /* temp for indirect calculations */
1858         xfs_filblks_t           temp2=0;
1859         enum {                          /* bit number definitions for state */
1860                 LEFT_CONTIG,    RIGHT_CONTIG,
1861                 LEFT_DELAY,     RIGHT_DELAY,
1862                 LEFT_VALID,     RIGHT_VALID
1863         };
1864
1865 #define MASK(b)                 (1 << (b))
1866 #define MASK2(a,b)              (MASK(a) | MASK(b))
1867 #define STATE_SET(b,v)          ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
1868 #define STATE_TEST(b)           (state & MASK(b))
1869 #define STATE_SET_TEST(b,v)     ((v) ? ((state |= MASK(b)), 1) : \
1870                                        ((state &= ~MASK(b)), 0))
1871 #define SWITCH_STATE            (state & MASK2(LEFT_CONTIG, RIGHT_CONTIG))
1872
1873         ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1874         ep = xfs_iext_get_ext(ifp, idx);
1875         state = 0;
1876         ASSERT(ISNULLSTARTBLOCK(new->br_startblock));
1877         /*
1878          * Check and set flags if this segment has a left neighbor
1879          */
1880         if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
1881                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx - 1), &left);
1882                 STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(left.br_startblock));
1883         }
1884         /*
1885          * Check and set flags if the current (right) segment exists.
1886          * If it doesn't exist, we're converting the hole at end-of-file.
1887          */
1888         if (STATE_SET_TEST(RIGHT_VALID,
1889                            idx <
1890                            ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
1891                 xfs_bmbt_get_all(ep, &right);
1892                 STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(right.br_startblock));
1893         }
1894         /*
1895          * Set contiguity flags on the left and right neighbors.
1896          * Don't let extents get too large, even if the pieces are contiguous.
1897          */
1898         STATE_SET(LEFT_CONTIG,
1899                 STATE_TEST(LEFT_VALID) && STATE_TEST(LEFT_DELAY) &&
1900                 left.br_startoff + left.br_blockcount == new->br_startoff &&
1901                 left.br_blockcount + new->br_blockcount <= MAXEXTLEN);
1902         STATE_SET(RIGHT_CONTIG,
1903                 STATE_TEST(RIGHT_VALID) && STATE_TEST(RIGHT_DELAY) &&
1904                 new->br_startoff + new->br_blockcount == right.br_startoff &&
1905                 new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
1906                 (!STATE_TEST(LEFT_CONTIG) ||
1907                  (left.br_blockcount + new->br_blockcount +
1908                      right.br_blockcount <= MAXEXTLEN)));
1909         /*
1910          * Switch out based on the contiguity flags.
1911          */
1912         switch (SWITCH_STATE) {
1913
1914         case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
1915                 /*
1916                  * New allocation is contiguous with delayed allocations
1917                  * on the left and on the right.
1918                  * Merge all three into a single extent record.
1919                  */
1920                 temp = left.br_blockcount + new->br_blockcount +
1921                         right.br_blockcount;
1922                 xfs_bmap_trace_pre_update(fname, "LC|RC", ip, idx - 1,
1923                         XFS_DATA_FORK);
1924                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1), temp);
1925                 oldlen = STARTBLOCKVAL(left.br_startblock) +
1926                         STARTBLOCKVAL(new->br_startblock) +
1927                         STARTBLOCKVAL(right.br_startblock);
1928                 newlen = xfs_bmap_worst_indlen(ip, temp);
1929                 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, idx - 1),
1930                         NULLSTARTBLOCK((int)newlen));
1931                 xfs_bmap_trace_post_update(fname, "LC|RC", ip, idx - 1,
1932                         XFS_DATA_FORK);
1933                 xfs_bmap_trace_delete(fname, "LC|RC", ip, idx, 1,
1934                         XFS_DATA_FORK);
1935                 xfs_iext_remove(ifp, idx, 1);
1936                 ip->i_df.if_lastex = idx - 1;
1937                 /* DELTA: Two in-core extents were replaced by one. */
1938                 temp2 = temp;
1939                 temp = left.br_startoff;
1940                 break;
1941
1942         case MASK(LEFT_CONTIG):
1943                 /*
1944                  * New allocation is contiguous with a delayed allocation
1945                  * on the left.
1946                  * Merge the new allocation with the left neighbor.
1947                  */
1948                 temp = left.br_blockcount + new->br_blockcount;
1949                 xfs_bmap_trace_pre_update(fname, "LC", ip, idx - 1,
1950                         XFS_DATA_FORK);
1951                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1), temp);
1952                 oldlen = STARTBLOCKVAL(left.br_startblock) +
1953                         STARTBLOCKVAL(new->br_startblock);
1954                 newlen = xfs_bmap_worst_indlen(ip, temp);
1955                 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, idx - 1),
1956                         NULLSTARTBLOCK((int)newlen));
1957                 xfs_bmap_trace_post_update(fname, "LC", ip, idx - 1,
1958                         XFS_DATA_FORK);
1959                 ip->i_df.if_lastex = idx - 1;
1960                 /* DELTA: One in-core extent grew into a hole. */
1961                 temp2 = temp;
1962                 temp = left.br_startoff;
1963                 break;
1964
1965         case MASK(RIGHT_CONTIG):
1966                 /*
1967                  * New allocation is contiguous with a delayed allocation
1968                  * on the right.
1969                  * Merge the new allocation with the right neighbor.
1970                  */
1971                 xfs_bmap_trace_pre_update(fname, "RC", ip, idx, XFS_DATA_FORK);
1972                 temp = new->br_blockcount + right.br_blockcount;
1973                 oldlen = STARTBLOCKVAL(new->br_startblock) +
1974                         STARTBLOCKVAL(right.br_startblock);
1975                 newlen = xfs_bmap_worst_indlen(ip, temp);
1976                 xfs_bmbt_set_allf(ep, new->br_startoff,
1977                         NULLSTARTBLOCK((int)newlen), temp, right.br_state);
1978                 xfs_bmap_trace_post_update(fname, "RC", ip, idx, XFS_DATA_FORK);
1979                 ip->i_df.if_lastex = idx;
1980                 /* DELTA: One in-core extent grew into a hole. */
1981                 temp2 = temp;
1982                 temp = new->br_startoff;
1983                 break;
1984
1985         case 0:
1986                 /*
1987                  * New allocation is not contiguous with another
1988                  * delayed allocation.
1989                  * Insert a new entry.
1990                  */
1991                 oldlen = newlen = 0;
1992                 xfs_bmap_trace_insert(fname, "0", ip, idx, 1, new, NULL,
1993                         XFS_DATA_FORK);
1994                 xfs_iext_insert(ifp, idx, 1, new);
1995                 ip->i_df.if_lastex = idx;
1996                 /* DELTA: A new in-core extent was added in a hole. */
1997                 temp2 = new->br_blockcount;
1998                 temp = new->br_startoff;
1999                 break;
2000         }
2001         if (oldlen != newlen) {
2002                 ASSERT(oldlen > newlen);
2003                 xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS,
2004                         (int64_t)(oldlen - newlen), rsvd);
2005                 /*
2006                  * Nothing to do for disk quota accounting here.
2007                  */
2008         }
2009         if (delta) {
2010                 temp2 += temp;
2011                 if (delta->xed_startoff > temp)
2012                         delta->xed_startoff = temp;
2013                 if (delta->xed_blockcount < temp2)
2014                         delta->xed_blockcount = temp2;
2015         }
2016         *logflagsp = 0;
2017         return 0;
2018 #undef  MASK
2019 #undef  MASK2
2020 #undef  STATE_SET
2021 #undef  STATE_TEST
2022 #undef  STATE_SET_TEST
2023 #undef  SWITCH_STATE
2024 }
2025
2026 /*
2027  * Called by xfs_bmap_add_extent to handle cases converting a hole
2028  * to a real allocation.
2029  */
2030 STATIC int                              /* error */
2031 xfs_bmap_add_extent_hole_real(
2032         xfs_inode_t             *ip,    /* incore inode pointer */
2033         xfs_extnum_t            idx,    /* extent number to update/insert */
2034         xfs_btree_cur_t         *cur,   /* if null, not a btree */
2035         xfs_bmbt_irec_t         *new,   /* new data to add to file extents */
2036         int                     *logflagsp, /* inode logging flags */
2037         xfs_extdelta_t          *delta, /* Change made to incore extents */
2038         int                     whichfork) /* data or attr fork */
2039 {
2040         xfs_bmbt_rec_t          *ep;    /* pointer to extent entry ins. point */
2041         int                     error;  /* error return value */
2042 #ifdef XFS_BMAP_TRACE
2043         static char             fname[] = "xfs_bmap_add_extent_hole_real";
2044 #endif
2045         int                     i;      /* temp state */
2046         xfs_ifork_t             *ifp;   /* inode fork pointer */
2047         xfs_bmbt_irec_t         left;   /* left neighbor extent entry */
2048         xfs_bmbt_irec_t         right;  /* right neighbor extent entry */
2049         int                     rval=0; /* return value (logging flags) */
2050         int                     state;  /* state bits, accessed thru macros */
2051         xfs_filblks_t           temp=0;
2052         xfs_filblks_t           temp2=0;
2053         enum {                          /* bit number definitions for state */
2054                 LEFT_CONTIG,    RIGHT_CONTIG,
2055                 LEFT_DELAY,     RIGHT_DELAY,
2056                 LEFT_VALID,     RIGHT_VALID
2057         };
2058
2059 #define MASK(b)                 (1 << (b))
2060 #define MASK2(a,b)              (MASK(a) | MASK(b))
2061 #define STATE_SET(b,v)          ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
2062 #define STATE_TEST(b)           (state & MASK(b))
2063 #define STATE_SET_TEST(b,v)     ((v) ? ((state |= MASK(b)), 1) : \
2064                                        ((state &= ~MASK(b)), 0))
2065 #define SWITCH_STATE            (state & MASK2(LEFT_CONTIG, RIGHT_CONTIG))
2066
2067         ifp = XFS_IFORK_PTR(ip, whichfork);
2068         ASSERT(idx <= ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t));
2069         ep = xfs_iext_get_ext(ifp, idx);
2070         state = 0;
2071         /*
2072          * Check and set flags if this segment has a left neighbor.
2073          */
2074         if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
2075                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx - 1), &left);
2076                 STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(left.br_startblock));
2077         }
2078         /*
2079          * Check and set flags if this segment has a current value.
2080          * Not true if we're inserting into the "hole" at eof.
2081          */
2082         if (STATE_SET_TEST(RIGHT_VALID,
2083                            idx <
2084                            ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
2085                 xfs_bmbt_get_all(ep, &right);
2086                 STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(right.br_startblock));
2087         }
2088         /*
2089          * We're inserting a real allocation between "left" and "right".
2090          * Set the contiguity flags.  Don't let extents get too large.
2091          */
2092         STATE_SET(LEFT_CONTIG,
2093                 STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
2094                 left.br_startoff + left.br_blockcount == new->br_startoff &&
2095                 left.br_startblock + left.br_blockcount == new->br_startblock &&
2096                 left.br_state == new->br_state &&
2097                 left.br_blockcount + new->br_blockcount <= MAXEXTLEN);
2098         STATE_SET(RIGHT_CONTIG,
2099                 STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
2100                 new->br_startoff + new->br_blockcount == right.br_startoff &&
2101                 new->br_startblock + new->br_blockcount ==
2102                     right.br_startblock &&
2103                 new->br_state == right.br_state &&
2104                 new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
2105                 (!STATE_TEST(LEFT_CONTIG) ||
2106                  left.br_blockcount + new->br_blockcount +
2107                      right.br_blockcount <= MAXEXTLEN));
2108
2109         error = 0;
2110         /*
2111          * Select which case we're in here, and implement it.
2112          */
2113         switch (SWITCH_STATE) {
2114
2115         case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
2116                 /*
2117                  * New allocation is contiguous with real allocations on the
2118                  * left and on the right.
2119                  * Merge all three into a single extent record.
2120                  */
2121                 xfs_bmap_trace_pre_update(fname, "LC|RC", ip, idx - 1,
2122                         whichfork);
2123                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
2124                         left.br_blockcount + new->br_blockcount +
2125                         right.br_blockcount);
2126                 xfs_bmap_trace_post_update(fname, "LC|RC", ip, idx - 1,
2127                         whichfork);
2128                 xfs_bmap_trace_delete(fname, "LC|RC", ip,
2129                         idx, 1, whichfork);
2130                 xfs_iext_remove(ifp, idx, 1);
2131                 ifp->if_lastex = idx - 1;
2132                 XFS_IFORK_NEXT_SET(ip, whichfork,
2133                         XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
2134                 if (cur == NULL) {
2135                         rval = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
2136                 } else {
2137                         rval = XFS_ILOG_CORE;
2138                         if ((error = xfs_bmbt_lookup_eq(cur,
2139                                         right.br_startoff,
2140                                         right.br_startblock,
2141                                         right.br_blockcount, &i)))
2142                                 goto done;
2143                         ASSERT(i == 1);
2144                         if ((error = xfs_bmbt_delete(cur, &i)))
2145                                 goto done;
2146                         ASSERT(i == 1);
2147                         if ((error = xfs_bmbt_decrement(cur, 0, &i)))
2148                                 goto done;
2149                         ASSERT(i == 1);
2150                         if ((error = xfs_bmbt_update(cur, left.br_startoff,
2151                                         left.br_startblock,
2152                                         left.br_blockcount +
2153                                                 new->br_blockcount +
2154                                                 right.br_blockcount,
2155                                         left.br_state)))
2156                                 goto done;
2157                 }
2158                 /* DELTA: Two in-core extents were replaced by one. */
2159                 temp = left.br_startoff;
2160                 temp2 = left.br_blockcount +
2161                         new->br_blockcount +
2162                         right.br_blockcount;
2163                 break;
2164
2165         case MASK(LEFT_CONTIG):
2166                 /*
2167                  * New allocation is contiguous with a real allocation
2168                  * on the left.
2169                  * Merge the new allocation with the left neighbor.
2170                  */
2171                 xfs_bmap_trace_pre_update(fname, "LC", ip, idx - 1, whichfork);
2172                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
2173                         left.br_blockcount + new->br_blockcount);
2174                 xfs_bmap_trace_post_update(fname, "LC", ip, idx - 1, whichfork);
2175                 ifp->if_lastex = idx - 1;
2176                 if (cur == NULL) {
2177                         rval = XFS_ILOG_FEXT(whichfork);
2178                 } else {
2179                         rval = 0;
2180                         if ((error = xfs_bmbt_lookup_eq(cur,
2181                                         left.br_startoff,
2182                                         left.br_startblock,
2183                                         left.br_blockcount, &i)))
2184                                 goto done;
2185                         ASSERT(i == 1);
2186                         if ((error = xfs_bmbt_update(cur, left.br_startoff,
2187                                         left.br_startblock,
2188                                         left.br_blockcount +
2189                                                 new->br_blockcount,
2190                                         left.br_state)))
2191                                 goto done;
2192                 }
2193                 /* DELTA: One in-core extent grew. */
2194                 temp = left.br_startoff;
2195                 temp2 = left.br_blockcount +
2196                         new->br_blockcount;
2197                 break;
2198
2199         case MASK(RIGHT_CONTIG):
2200                 /*
2201                  * New allocation is contiguous with a real allocation
2202                  * on the right.
2203                  * Merge the new allocation with the right neighbor.
2204                  */
2205                 xfs_bmap_trace_pre_update(fname, "RC", ip, idx, whichfork);
2206                 xfs_bmbt_set_allf(ep, new->br_startoff, new->br_startblock,
2207                         new->br_blockcount + right.br_blockcount,
2208                         right.br_state);
2209                 xfs_bmap_trace_post_update(fname, "RC", ip, idx, whichfork);
2210                 ifp->if_lastex = idx;
2211                 if (cur == NULL) {
2212                         rval = XFS_ILOG_FEXT(whichfork);
2213                 } else {
2214                         rval = 0;
2215                         if ((error = xfs_bmbt_lookup_eq(cur,
2216                                         right.br_startoff,
2217                                         right.br_startblock,
2218                                         right.br_blockcount, &i)))
2219                                 goto done;
2220                         ASSERT(i == 1);
2221                         if ((error = xfs_bmbt_update(cur, new->br_startoff,
2222                                         new->br_startblock,
2223                                         new->br_blockcount +
2224                                                 right.br_blockcount,
2225                                         right.br_state)))
2226                                 goto done;
2227                 }
2228                 /* DELTA: One in-core extent grew. */
2229                 temp = new->br_startoff;
2230                 temp2 = new->br_blockcount +
2231                         right.br_blockcount;
2232                 break;
2233
2234         case 0:
2235                 /*
2236                  * New allocation is not contiguous with another
2237                  * real allocation.
2238                  * Insert a new entry.
2239                  */
2240                 xfs_bmap_trace_insert(fname, "0", ip, idx, 1, new, NULL,
2241                         whichfork);
2242                 xfs_iext_insert(ifp, idx, 1, new);
2243                 ifp->if_lastex = idx;
2244                 XFS_IFORK_NEXT_SET(ip, whichfork,
2245                         XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
2246                 if (cur == NULL) {
2247                         rval = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
2248                 } else {
2249                         rval = XFS_ILOG_CORE;
2250                         if ((error = xfs_bmbt_lookup_eq(cur,
2251                                         new->br_startoff,
2252                                         new->br_startblock,
2253                                         new->br_blockcount, &i)))
2254                                 goto done;
2255                         ASSERT(i == 0);
2256                         cur->bc_rec.b.br_state = new->br_state;
2257                         if ((error = xfs_bmbt_insert(cur, &i)))
2258                                 goto done;
2259                         ASSERT(i == 1);
2260                 }
2261                 /* DELTA: A new extent was added in a hole. */
2262                 temp = new->br_startoff;
2263                 temp2 = new->br_blockcount;
2264                 break;
2265         }
2266         if (delta) {
2267                 temp2 += temp;
2268                 if (delta->xed_startoff > temp)
2269                         delta->xed_startoff = temp;
2270                 if (delta->xed_blockcount < temp2)
2271                         delta->xed_blockcount = temp2;
2272         }
2273 done:
2274         *logflagsp = rval;
2275         return error;
2276 #undef  MASK
2277 #undef  MASK2
2278 #undef  STATE_SET
2279 #undef  STATE_TEST
2280 #undef  STATE_SET_TEST
2281 #undef  SWITCH_STATE
2282 }
2283
2284 /*
2285  * Adjust the size of the new extent based on di_extsize and rt extsize.
2286  */
2287 STATIC int
2288 xfs_bmap_extsize_align(
2289         xfs_mount_t     *mp,
2290         xfs_bmbt_irec_t *gotp,          /* next extent pointer */
2291         xfs_bmbt_irec_t *prevp,         /* previous extent pointer */
2292         xfs_extlen_t    extsz,          /* align to this extent size */
2293         int             rt,             /* is this a realtime inode? */
2294         int             eof,            /* is extent at end-of-file? */
2295         int             delay,          /* creating delalloc extent? */
2296         int             convert,        /* overwriting unwritten extent? */
2297         xfs_fileoff_t   *offp,          /* in/out: aligned offset */
2298         xfs_extlen_t    *lenp)          /* in/out: aligned length */
2299 {
2300         xfs_fileoff_t   orig_off;       /* original offset */
2301         xfs_extlen_t    orig_alen;      /* original length */
2302         xfs_fileoff_t   orig_end;       /* original off+len */
2303         xfs_fileoff_t   nexto;          /* next file offset */
2304         xfs_fileoff_t   prevo;          /* previous file offset */
2305         xfs_fileoff_t   align_off;      /* temp for offset */
2306         xfs_extlen_t    align_alen;     /* temp for length */
2307         xfs_extlen_t    temp;           /* temp for calculations */
2308
2309         if (convert)
2310                 return 0;
2311
2312         orig_off = align_off = *offp;
2313         orig_alen = align_alen = *lenp;
2314         orig_end = orig_off + orig_alen;
2315
2316         /*
2317          * If this request overlaps an existing extent, then don't
2318          * attempt to perform any additional alignment.
2319          */
2320         if (!delay && !eof &&
2321             (orig_off >= gotp->br_startoff) &&
2322             (orig_end <= gotp->br_startoff + gotp->br_blockcount)) {
2323                 return 0;
2324         }
2325
2326         /*
2327          * If the file offset is unaligned vs. the extent size
2328          * we need to align it.  This will be possible unless
2329          * the file was previously written with a kernel that didn't
2330          * perform this alignment, or if a truncate shot us in the
2331          * foot.
2332          */
2333         temp = do_mod(orig_off, extsz);
2334         if (temp) {
2335                 align_alen += temp;
2336                 align_off -= temp;
2337         }
2338         /*
2339          * Same adjustment for the end of the requested area.
2340          */
2341         if ((temp = (align_alen % extsz))) {
2342                 align_alen += extsz - temp;
2343         }
2344         /*
2345          * If the previous block overlaps with this proposed allocation
2346          * then move the start forward without adjusting the length.
2347          */
2348         if (prevp->br_startoff != NULLFILEOFF) {
2349                 if (prevp->br_startblock == HOLESTARTBLOCK)
2350                         prevo = prevp->br_startoff;
2351                 else
2352                         prevo = prevp->br_startoff + prevp->br_blockcount;
2353         } else
2354                 prevo = 0;
2355         if (align_off != orig_off && align_off < prevo)
2356                 align_off = prevo;
2357         /*
2358          * If the next block overlaps with this proposed allocation
2359          * then move the start back without adjusting the length,
2360          * but not before offset 0.
2361          * This may of course make the start overlap previous block,
2362          * and if we hit the offset 0 limit then the next block
2363          * can still overlap too.
2364          */
2365         if (!eof && gotp->br_startoff != NULLFILEOFF) {
2366                 if ((delay && gotp->br_startblock == HOLESTARTBLOCK) ||
2367                     (!delay && gotp->br_startblock == DELAYSTARTBLOCK))
2368                         nexto = gotp->br_startoff + gotp->br_blockcount;
2369                 else
2370                         nexto = gotp->br_startoff;
2371         } else
2372                 nexto = NULLFILEOFF;
2373         if (!eof &&
2374             align_off + align_alen != orig_end &&
2375             align_off + align_alen > nexto)
2376                 align_off = nexto > align_alen ? nexto - align_alen : 0;
2377         /*
2378          * If we're now overlapping the next or previous extent that
2379          * means we can't fit an extsz piece in this hole.  Just move
2380          * the start forward to the first valid spot and set
2381          * the length so we hit the end.
2382          */
2383         if (align_off != orig_off && align_off < prevo)
2384                 align_off = prevo;
2385         if (align_off + align_alen != orig_end &&
2386             align_off + align_alen > nexto &&
2387             nexto != NULLFILEOFF) {
2388                 ASSERT(nexto > prevo);
2389                 align_alen = nexto - align_off;
2390         }
2391
2392         /*
2393          * If realtime, and the result isn't a multiple of the realtime
2394          * extent size we need to remove blocks until it is.
2395          */
2396         if (rt && (temp = (align_alen % mp->m_sb.sb_rextsize))) {
2397                 /*
2398                  * We're not covering the original request, or
2399                  * we won't be able to once we fix the length.
2400                  */
2401                 if (orig_off < align_off ||
2402                     orig_end > align_off + align_alen ||
2403                     align_alen - temp < orig_alen)
2404                         return XFS_ERROR(EINVAL);
2405                 /*
2406                  * Try to fix it by moving the start up.
2407                  */
2408                 if (align_off + temp <= orig_off) {
2409                         align_alen -= temp;
2410                         align_off += temp;
2411                 }
2412                 /*
2413                  * Try to fix it by moving the end in.
2414                  */
2415                 else if (align_off + align_alen - temp >= orig_end)
2416                         align_alen -= temp;
2417                 /*
2418                  * Set the start to the minimum then trim the length.
2419                  */
2420                 else {
2421                         align_alen -= orig_off - align_off;
2422                         align_off = orig_off;
2423                         align_alen -= align_alen % mp->m_sb.sb_rextsize;
2424                 }
2425                 /*
2426                  * Result doesn't cover the request, fail it.
2427                  */
2428                 if (orig_off < align_off || orig_end > align_off + align_alen)
2429                         return XFS_ERROR(EINVAL);
2430         } else {
2431                 ASSERT(orig_off >= align_off);
2432                 ASSERT(orig_end <= align_off + align_alen);
2433         }
2434
2435 #ifdef DEBUG
2436         if (!eof && gotp->br_startoff != NULLFILEOFF)
2437                 ASSERT(align_off + align_alen <= gotp->br_startoff);
2438         if (prevp->br_startoff != NULLFILEOFF)
2439                 ASSERT(align_off >= prevp->br_startoff + prevp->br_blockcount);
2440 #endif
2441
2442         *lenp = align_alen;
2443         *offp = align_off;
2444         return 0;
2445 }
2446
2447 #define XFS_ALLOC_GAP_UNITS     4
2448
2449 STATIC int
2450 xfs_bmap_adjacent(
2451         xfs_bmalloca_t  *ap)            /* bmap alloc argument struct */
2452 {
2453         xfs_fsblock_t   adjust;         /* adjustment to block numbers */
2454         xfs_agnumber_t  fb_agno;        /* ag number of ap->firstblock */
2455         xfs_mount_t     *mp;            /* mount point structure */
2456         int             nullfb;         /* true if ap->firstblock isn't set */
2457         int             rt;             /* true if inode is realtime */
2458
2459 #define ISVALID(x,y)    \
2460         (rt ? \
2461                 (x) < mp->m_sb.sb_rblocks : \
2462                 XFS_FSB_TO_AGNO(mp, x) == XFS_FSB_TO_AGNO(mp, y) && \
2463                 XFS_FSB_TO_AGNO(mp, x) < mp->m_sb.sb_agcount && \
2464                 XFS_FSB_TO_AGBNO(mp, x) < mp->m_sb.sb_agblocks)
2465
2466         mp = ap->ip->i_mount;
2467         nullfb = ap->firstblock == NULLFSBLOCK;
2468         rt = XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata;
2469         fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, ap->firstblock);
2470         /*
2471          * If allocating at eof, and there's a previous real block,
2472          * try to use it's last block as our starting point.
2473          */
2474         if (ap->eof && ap->prevp->br_startoff != NULLFILEOFF &&
2475             !ISNULLSTARTBLOCK(ap->prevp->br_startblock) &&
2476             ISVALID(ap->prevp->br_startblock + ap->prevp->br_blockcount,
2477                     ap->prevp->br_startblock)) {
2478                 ap->rval = ap->prevp->br_startblock + ap->prevp->br_blockcount;
2479                 /*
2480                  * Adjust for the gap between prevp and us.
2481                  */
2482                 adjust = ap->off -
2483                         (ap->prevp->br_startoff + ap->prevp->br_blockcount);
2484                 if (adjust &&
2485                     ISVALID(ap->rval + adjust, ap->prevp->br_startblock))
2486                         ap->rval += adjust;
2487         }
2488         /*
2489          * If not at eof, then compare the two neighbor blocks.
2490          * Figure out whether either one gives us a good starting point,
2491          * and pick the better one.
2492          */
2493         else if (!ap->eof) {
2494                 xfs_fsblock_t   gotbno;         /* right side block number */
2495                 xfs_fsblock_t   gotdiff=0;      /* right side difference */
2496                 xfs_fsblock_t   prevbno;        /* left side block number */
2497                 xfs_fsblock_t   prevdiff=0;     /* left side difference */
2498
2499                 /*
2500                  * If there's a previous (left) block, select a requested
2501                  * start block based on it.
2502                  */
2503                 if (ap->prevp->br_startoff != NULLFILEOFF &&
2504                     !ISNULLSTARTBLOCK(ap->prevp->br_startblock) &&
2505                     (prevbno = ap->prevp->br_startblock +
2506                                ap->prevp->br_blockcount) &&
2507                     ISVALID(prevbno, ap->prevp->br_startblock)) {
2508                         /*
2509                          * Calculate gap to end of previous block.
2510                          */
2511                         adjust = prevdiff = ap->off -
2512                                 (ap->prevp->br_startoff +
2513                                  ap->prevp->br_blockcount);
2514                         /*
2515                          * Figure the startblock based on the previous block's
2516                          * end and the gap size.
2517                          * Heuristic!
2518                          * If the gap is large relative to the piece we're
2519                          * allocating, or using it gives us an invalid block
2520                          * number, then just use the end of the previous block.
2521                          */
2522                         if (prevdiff <= XFS_ALLOC_GAP_UNITS * ap->alen &&
2523                             ISVALID(prevbno + prevdiff,
2524                                     ap->prevp->br_startblock))
2525                                 prevbno += adjust;
2526                         else
2527                                 prevdiff += adjust;
2528                         /*
2529                          * If the firstblock forbids it, can't use it,
2530                          * must use default.
2531                          */
2532                         if (!rt && !nullfb &&
2533                             XFS_FSB_TO_AGNO(mp, prevbno) != fb_agno)
2534                                 prevbno = NULLFSBLOCK;
2535                 }
2536                 /*
2537                  * No previous block or can't follow it, just default.
2538                  */
2539                 else
2540                         prevbno = NULLFSBLOCK;
2541                 /*
2542                  * If there's a following (right) block, select a requested
2543                  * start block based on it.
2544                  */
2545                 if (!ISNULLSTARTBLOCK(ap->gotp->br_startblock)) {
2546                         /*
2547                          * Calculate gap to start of next block.
2548                          */
2549                         adjust = gotdiff = ap->gotp->br_startoff - ap->off;
2550                         /*
2551                          * Figure the startblock based on the next block's
2552                          * start and the gap size.
2553                          */
2554                         gotbno = ap->gotp->br_startblock;
2555                         /*
2556                          * Heuristic!
2557                          * If the gap is large relative to the piece we're
2558                          * allocating, or using it gives us an invalid block
2559                          * number, then just use the start of the next block
2560                          * offset by our length.
2561                          */
2562                         if (gotdiff <= XFS_ALLOC_GAP_UNITS * ap->alen &&
2563                             ISVALID(gotbno - gotdiff, gotbno))
2564                                 gotbno -= adjust;
2565                         else if (ISVALID(gotbno - ap->alen, gotbno)) {
2566                                 gotbno -= ap->alen;
2567                                 gotdiff += adjust - ap->alen;
2568                         } else
2569                                 gotdiff += adjust;
2570                         /*
2571                          * If the firstblock forbids it, can't use it,
2572                          * must use default.
2573                          */
2574                         if (!rt && !nullfb &&
2575                             XFS_FSB_TO_AGNO(mp, gotbno) != fb_agno)
2576                                 gotbno = NULLFSBLOCK;
2577                 }
2578                 /*
2579                  * No next block, just default.
2580                  */
2581                 else
2582                         gotbno = NULLFSBLOCK;
2583                 /*
2584                  * If both valid, pick the better one, else the only good
2585                  * one, else ap->rval is already set (to 0 or the inode block).
2586                  */
2587                 if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK)
2588                         ap->rval = prevdiff <= gotdiff ? prevbno : gotbno;
2589                 else if (prevbno != NULLFSBLOCK)
2590                         ap->rval = prevbno;
2591                 else if (gotbno != NULLFSBLOCK)
2592                         ap->rval = gotbno;
2593         }
2594 #undef ISVALID
2595         return 0;
2596 }
2597
2598 STATIC int
2599 xfs_bmap_rtalloc(
2600         xfs_bmalloca_t  *ap)            /* bmap alloc argument struct */
2601 {
2602         xfs_alloctype_t atype = 0;      /* type for allocation routines */
2603         int             error;          /* error return value */
2604         xfs_mount_t     *mp;            /* mount point structure */
2605         xfs_extlen_t    prod = 0;       /* product factor for allocators */
2606         xfs_extlen_t    ralen = 0;      /* realtime allocation length */
2607         xfs_extlen_t    align;          /* minimum allocation alignment */
2608         xfs_rtblock_t   rtx;            /* realtime extent number */
2609         xfs_rtblock_t   rtb;
2610
2611         mp = ap->ip->i_mount;
2612         align = xfs_get_extsz_hint(ap->ip);
2613         prod = align / mp->m_sb.sb_rextsize;
2614         error = xfs_bmap_extsize_align(mp, ap->gotp, ap->prevp,
2615                                         align, 1, ap->eof, 0,
2616                                         ap->conv, &ap->off, &ap->alen);
2617         if (error)
2618                 return error;
2619         ASSERT(ap->alen);
2620         ASSERT(ap->alen % mp->m_sb.sb_rextsize == 0);
2621
2622         /*
2623          * If the offset & length are not perfectly aligned
2624          * then kill prod, it will just get us in trouble.
2625          */
2626         if (do_mod(ap->off, align) || ap->alen % align)
2627                 prod = 1;
2628         /*
2629          * Set ralen to be the actual requested length in rtextents.
2630          */
2631         ralen = ap->alen / mp->m_sb.sb_rextsize;
2632         /*
2633          * If the old value was close enough to MAXEXTLEN that
2634          * we rounded up to it, cut it back so it's valid again.
2635          * Note that if it's a really large request (bigger than
2636          * MAXEXTLEN), we don't hear about that number, and can't
2637          * adjust the starting point to match it.
2638          */
2639         if (ralen * mp->m_sb.sb_rextsize >= MAXEXTLEN)
2640                 ralen = MAXEXTLEN / mp->m_sb.sb_rextsize;
2641         /*
2642          * If it's an allocation to an empty file at offset 0,
2643          * pick an extent that will space things out in the rt area.
2644          */
2645         if (ap->eof && ap->off == 0) {
2646                 error = xfs_rtpick_extent(mp, ap->tp, ralen, &rtx);
2647                 if (error)
2648                         return error;
2649                 ap->rval = rtx * mp->m_sb.sb_rextsize;
2650         } else {
2651                 ap->rval = 0;
2652         }
2653
2654         xfs_bmap_adjacent(ap);
2655
2656         /*
2657          * Realtime allocation, done through xfs_rtallocate_extent.
2658          */
2659         atype = ap->rval == 0 ?  XFS_ALLOCTYPE_ANY_AG : XFS_ALLOCTYPE_NEAR_BNO;
2660         do_div(ap->rval, mp->m_sb.sb_rextsize);
2661         rtb = ap->rval;
2662         ap->alen = ralen;
2663         if ((error = xfs_rtallocate_extent(ap->tp, ap->rval, 1, ap->alen,
2664                                 &ralen, atype, ap->wasdel, prod, &rtb)))
2665                 return error;
2666         if (rtb == NULLFSBLOCK && prod > 1 &&
2667             (error = xfs_rtallocate_extent(ap->tp, ap->rval, 1,
2668                                            ap->alen, &ralen, atype,
2669                                            ap->wasdel, 1, &rtb)))
2670                 return error;
2671         ap->rval = rtb;
2672         if (ap->rval != NULLFSBLOCK) {
2673                 ap->rval *= mp->m_sb.sb_rextsize;
2674                 ralen *= mp->m_sb.sb_rextsize;
2675                 ap->alen = ralen;
2676                 ap->ip->i_d.di_nblocks += ralen;
2677                 xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
2678                 if (ap->wasdel)
2679                         ap->ip->i_delayed_blks -= ralen;
2680                 /*
2681                  * Adjust the disk quota also. This was reserved
2682                  * earlier.
2683                  */
2684                 XFS_TRANS_MOD_DQUOT_BYINO(mp, ap->tp, ap->ip,
2685                         ap->wasdel ? XFS_TRANS_DQ_DELRTBCOUNT :
2686                                         XFS_TRANS_DQ_RTBCOUNT, (long) ralen);
2687         } else {
2688                 ap->alen = 0;
2689         }
2690         return 0;
2691 }
2692
2693 STATIC int
2694 xfs_bmap_btalloc(
2695         xfs_bmalloca_t  *ap)            /* bmap alloc argument struct */
2696 {
2697         xfs_mount_t     *mp;            /* mount point structure */
2698         xfs_alloctype_t atype = 0;      /* type for allocation routines */
2699         xfs_extlen_t    align;          /* minimum allocation alignment */
2700         xfs_agnumber_t  ag;
2701         xfs_agnumber_t  fb_agno;        /* ag number of ap->firstblock */
2702         xfs_agnumber_t  startag;
2703         xfs_alloc_arg_t args;
2704         xfs_extlen_t    blen;
2705         xfs_extlen_t    delta;
2706         xfs_extlen_t    longest;
2707         xfs_extlen_t    need;
2708         xfs_extlen_t    nextminlen = 0;
2709         xfs_perag_t     *pag;
2710         int             nullfb;         /* true if ap->firstblock isn't set */
2711         int             isaligned;
2712         int             notinit;
2713         int             tryagain;
2714         int             error;
2715
2716         mp = ap->ip->i_mount;
2717         align = ap->userdata ? xfs_get_extsz_hint(ap->ip) : 0;
2718         if (unlikely(align)) {
2719                 error = xfs_bmap_extsize_align(mp, ap->gotp, ap->prevp,
2720                                                 align, 0, ap->eof, 0, ap->conv,
2721                                                 &ap->off, &ap->alen);
2722                 ASSERT(!error);
2723                 ASSERT(ap->alen);
2724         }
2725         nullfb = ap->firstblock == NULLFSBLOCK;
2726         fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, ap->firstblock);
2727         if (nullfb)
2728                 ap->rval = XFS_INO_TO_FSB(mp, ap->ip->i_ino);
2729         else
2730                 ap->rval = ap->firstblock;
2731
2732         xfs_bmap_adjacent(ap);
2733
2734         /*
2735          * If allowed, use ap->rval; otherwise must use firstblock since
2736          * it's in the right allocation group.
2737          */
2738         if (nullfb || XFS_FSB_TO_AGNO(mp, ap->rval) == fb_agno)
2739                 ;
2740         else
2741                 ap->rval = ap->firstblock;
2742         /*
2743          * Normal allocation, done through xfs_alloc_vextent.
2744          */
2745         tryagain = isaligned = 0;
2746         args.tp = ap->tp;
2747         args.mp = mp;
2748         args.fsbno = ap->rval;
2749         args.maxlen = MIN(ap->alen, mp->m_sb.sb_agblocks);
2750         args.firstblock = ap->firstblock;
2751         blen = 0;
2752         if (nullfb) {
2753                 args.type = XFS_ALLOCTYPE_START_BNO;
2754                 args.total = ap->total;
2755                 /*
2756                  * Find the longest available space.
2757                  * We're going to try for the whole allocation at once.
2758                  */
2759                 startag = ag = XFS_FSB_TO_AGNO(mp, args.fsbno);
2760                 notinit = 0;
2761                 down_read(&mp->m_peraglock);
2762                 while (blen < ap->alen) {
2763                         pag = &mp->m_perag[ag];
2764                         if (!pag->pagf_init &&
2765                             (error = xfs_alloc_pagf_init(mp, args.tp,
2766                                     ag, XFS_ALLOC_FLAG_TRYLOCK))) {
2767                                 up_read(&mp->m_peraglock);
2768                                 return error;
2769                         }
2770                         /*
2771                          * See xfs_alloc_fix_freelist...
2772                          */
2773                         if (pag->pagf_init) {
2774                                 need = XFS_MIN_FREELIST_PAG(pag, mp);
2775                                 delta = need > pag->pagf_flcount ?
2776                                         need - pag->pagf_flcount : 0;
2777                                 longest = (pag->pagf_longest > delta) ?
2778                                         (pag->pagf_longest - delta) :
2779                                         (pag->pagf_flcount > 0 ||
2780                                          pag->pagf_longest > 0);
2781                                 if (blen < longest)
2782                                         blen = longest;
2783                         } else
2784                                 notinit = 1;
2785                         if (++ag == mp->m_sb.sb_agcount)
2786                                 ag = 0;
2787                         if (ag == startag)
2788                                 break;
2789                 }
2790                 up_read(&mp->m_peraglock);
2791                 /*
2792                  * Since the above loop did a BUF_TRYLOCK, it is
2793                  * possible that there is space for this request.
2794                  */
2795                 if (notinit || blen < ap->minlen)
2796                         args.minlen = ap->minlen;
2797                 /*
2798                  * If the best seen length is less than the request
2799                  * length, use the best as the minimum.
2800                  */
2801                 else if (blen < ap->alen)
2802                         args.minlen = blen;
2803                 /*
2804                  * Otherwise we've seen an extent as big as alen,
2805                  * use that as the minimum.
2806                  */
2807                 else
2808                         args.minlen = ap->alen;
2809         } else if (ap->low) {
2810                 args.type = XFS_ALLOCTYPE_START_BNO;
2811                 args.total = args.minlen = ap->minlen;
2812         } else {
2813                 args.type = XFS_ALLOCTYPE_NEAR_BNO;
2814                 args.total = ap->total;
2815                 args.minlen = ap->minlen;
2816         }
2817         /* apply extent size hints if obtained earlier */
2818         if (unlikely(align)) {
2819                 args.prod = align;
2820                 if ((args.mod = (xfs_extlen_t)do_mod(ap->off, args.prod)))
2821                         args.mod = (xfs_extlen_t)(args.prod - args.mod);
2822         } else if (mp->m_sb.sb_blocksize >= NBPP) {
2823                 args.prod = 1;
2824                 args.mod = 0;
2825         } else {
2826                 args.prod = NBPP >> mp->m_sb.sb_blocklog;
2827                 if ((args.mod = (xfs_extlen_t)(do_mod(ap->off, args.prod))))
2828                         args.mod = (xfs_extlen_t)(args.prod - args.mod);
2829         }
2830         /*
2831          * If we are not low on available data blocks, and the
2832          * underlying logical volume manager is a stripe, and
2833          * the file offset is zero then try to allocate data
2834          * blocks on stripe unit boundary.
2835          * NOTE: ap->aeof is only set if the allocation length
2836          * is >= the stripe unit and the allocation offset is
2837          * at the end of file.
2838          */
2839         if (!ap->low && ap->aeof) {
2840                 if (!ap->off) {
2841                         args.alignment = mp->m_dalign;
2842                         atype = args.type;
2843                         isaligned = 1;
2844                         /*
2845                          * Adjust for alignment
2846                          */
2847                         if (blen > args.alignment && blen <= ap->alen)
2848                                 args.minlen = blen - args.alignment;
2849                         args.minalignslop = 0;
2850                 } else {
2851                         /*
2852                          * First try an exact bno allocation.
2853                          * If it fails then do a near or start bno
2854                          * allocation with alignment turned on.
2855                          */
2856                         atype = args.type;
2857                         tryagain = 1;
2858                         args.type = XFS_ALLOCTYPE_THIS_BNO;
2859                         args.alignment = 1;
2860                         /*
2861                          * Compute the minlen+alignment for the
2862                          * next case.  Set slop so that the value
2863                          * of minlen+alignment+slop doesn't go up
2864                          * between the calls.
2865                          */
2866                         if (blen > mp->m_dalign && blen <= ap->alen)
2867                                 nextminlen = blen - mp->m_dalign;
2868                         else
2869                                 nextminlen = args.minlen;
2870                         if (nextminlen + mp->m_dalign > args.minlen + 1)
2871                                 args.minalignslop =
2872                                         nextminlen + mp->m_dalign -
2873                                         args.minlen - 1;
2874                         else
2875                                 args.minalignslop = 0;
2876                 }
2877         } else {
2878                 args.alignment = 1;
2879                 args.minalignslop = 0;
2880         }
2881         args.minleft = ap->minleft;
2882         args.wasdel = ap->wasdel;
2883         args.isfl = 0;
2884         args.userdata = ap->userdata;
2885         if ((error = xfs_alloc_vextent(&args)))
2886                 return error;
2887         if (tryagain && args.fsbno == NULLFSBLOCK) {
2888                 /*
2889                  * Exact allocation failed. Now try with alignment
2890                  * turned on.
2891                  */
2892                 args.type = atype;
2893                 args.fsbno = ap->rval;
2894                 args.alignment = mp->m_dalign;
2895                 args.minlen = nextminlen;
2896                 args.minalignslop = 0;
2897                 isaligned = 1;
2898                 if ((error = xfs_alloc_vextent(&args)))
2899                         return error;
2900         }
2901         if (isaligned && args.fsbno == NULLFSBLOCK) {
2902                 /*
2903                  * allocation failed, so turn off alignment and
2904                  * try again.
2905                  */
2906                 args.type = atype;
2907                 args.fsbno = ap->rval;
2908                 args.alignment = 0;
2909                 if ((error = xfs_alloc_vextent(&args)))
2910                         return error;
2911         }
2912         if (args.fsbno == NULLFSBLOCK && nullfb &&
2913             args.minlen > ap->minlen) {
2914                 args.minlen = ap->minlen;
2915                 args.type = XFS_ALLOCTYPE_START_BNO;
2916                 args.fsbno = ap->rval;
2917                 if ((error = xfs_alloc_vextent(&args)))
2918                         return error;
2919         }
2920         if (args.fsbno == NULLFSBLOCK && nullfb) {
2921                 args.fsbno = 0;
2922                 args.type = XFS_ALLOCTYPE_FIRST_AG;
2923                 args.total = ap->minlen;
2924                 args.minleft = 0;
2925                 if ((error = xfs_alloc_vextent(&args)))
2926                         return error;
2927                 ap->low = 1;
2928         }
2929         if (args.fsbno != NULLFSBLOCK) {
2930                 ap->firstblock = ap->rval = args.fsbno;
2931                 ASSERT(nullfb || fb_agno == args.agno ||
2932                        (ap->low && fb_agno < args.agno));
2933                 ap->alen = args.len;
2934                 ap->ip->i_d.di_nblocks += args.len;
2935                 xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
2936                 if (ap->wasdel)
2937                         ap->ip->i_delayed_blks -= args.len;
2938                 /*
2939                  * Adjust the disk quota also. This was reserved
2940                  * earlier.
2941                  */
2942                 XFS_TRANS_MOD_DQUOT_BYINO(mp, ap->tp, ap->ip,
2943                         ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT :
2944                                         XFS_TRANS_DQ_BCOUNT,
2945                         (long) args.len);
2946         } else {
2947                 ap->rval = NULLFSBLOCK;
2948                 ap->alen = 0;
2949         }
2950         return 0;
2951 }
2952
2953 /*
2954  * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
2955  * It figures out where to ask the underlying allocator to put the new extent.
2956  */
2957 STATIC int
2958 xfs_bmap_alloc(
2959         xfs_bmalloca_t  *ap)            /* bmap alloc argument struct */
2960 {
2961         if ((ap->ip->i_d.di_flags & XFS_DIFLAG_REALTIME) && ap->userdata)
2962                 return xfs_bmap_rtalloc(ap);
2963         return xfs_bmap_btalloc(ap);
2964 }
2965
2966 /*
2967  * Transform a btree format file with only one leaf node, where the
2968  * extents list will fit in the inode, into an extents format file.
2969  * Since the file extents are already in-core, all we have to do is
2970  * give up the space for the btree root and pitch the leaf block.
2971  */
2972 STATIC int                              /* error */
2973 xfs_bmap_btree_to_extents(
2974         xfs_trans_t             *tp,    /* transaction pointer */
2975         xfs_inode_t             *ip,    /* incore inode pointer */
2976         xfs_btree_cur_t         *cur,   /* btree cursor */
2977         int                     *logflagsp, /* inode logging flags */
2978         int                     whichfork)  /* data or attr fork */
2979 {
2980         /* REFERENCED */
2981         xfs_bmbt_block_t        *cblock;/* child btree block */
2982         xfs_fsblock_t           cbno;   /* child block number */
2983         xfs_buf_t               *cbp;   /* child block's buffer */
2984         int                     error;  /* error return value */
2985         xfs_ifork_t             *ifp;   /* inode fork data */
2986         xfs_mount_t             *mp;    /* mount point structure */
2987         __be64                  *pp;    /* ptr to block address */
2988         xfs_bmbt_block_t        *rblock;/* root btree block */
2989
2990         ifp = XFS_IFORK_PTR(ip, whichfork);
2991         ASSERT(ifp->if_flags & XFS_IFEXTENTS);
2992         ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
2993         rblock = ifp->if_broot;
2994         ASSERT(be16_to_cpu(rblock->bb_level) == 1);
2995         ASSERT(be16_to_cpu(rblock->bb_numrecs) == 1);
2996         ASSERT(XFS_BMAP_BROOT_MAXRECS(ifp->if_broot_bytes) == 1);
2997         mp = ip->i_mount;
2998         pp = XFS_BMAP_BROOT_PTR_ADDR(rblock, 1, ifp->if_broot_bytes);
2999         cbno = be64_to_cpu(*pp);
3000         *logflagsp = 0;
3001 #ifdef DEBUG
3002         if ((error = xfs_btree_check_lptr(cur, cbno, 1)))
3003                 return error;
3004 #endif
3005         if ((error = xfs_btree_read_bufl(mp, tp, cbno, 0, &cbp,
3006                         XFS_BMAP_BTREE_REF)))
3007                 return error;
3008         cblock = XFS_BUF_TO_BMBT_BLOCK(cbp);
3009         if ((error = xfs_btree_check_lblock(cur, cblock, 0, cbp)))
3010                 return error;
3011         xfs_bmap_add_free(cbno, 1, cur->bc_private.b.flist, mp);
3012         ip->i_d.di_nblocks--;
3013         XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
3014         xfs_trans_binval(tp, cbp);
3015         if (cur->bc_bufs[0] == cbp)
3016                 cur->bc_bufs[0] = NULL;
3017         xfs_iroot_realloc(ip, -1, whichfork);
3018         ASSERT(ifp->if_broot == NULL);
3019         ASSERT((ifp->if_flags & XFS_IFBROOT) == 0);
3020         XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
3021         *logflagsp = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
3022         return 0;
3023 }
3024
3025 /*
3026  * Called by xfs_bmapi to update file extent records and the btree
3027  * after removing space (or undoing a delayed allocation).
3028  */
3029 STATIC int                              /* error */
3030 xfs_bmap_del_extent(
3031         xfs_inode_t             *ip,    /* incore inode pointer */
3032         xfs_trans_t             *tp,    /* current transaction pointer */
3033         xfs_extnum_t            idx,    /* extent number to update/delete */
3034         xfs_bmap_free_t         *flist, /* list of extents to be freed */
3035         xfs_btree_cur_t         *cur,   /* if null, not a btree */
3036         xfs_bmbt_irec_t         *del,   /* data to remove from extents */
3037         int                     *logflagsp, /* inode logging flags */
3038         xfs_extdelta_t          *delta, /* Change made to incore extents */
3039         int                     whichfork, /* data or attr fork */
3040         int                     rsvd)   /* OK to allocate reserved blocks */
3041 {
3042         xfs_filblks_t           da_new; /* new delay-alloc indirect blocks */
3043         xfs_filblks_t           da_old; /* old delay-alloc indirect blocks */
3044         xfs_fsblock_t           del_endblock=0; /* first block past del */
3045         xfs_fileoff_t           del_endoff;     /* first offset past del */
3046         int                     delay;  /* current block is delayed allocated */
3047         int                     do_fx;  /* free extent at end of routine */
3048         xfs_bmbt_rec_t          *ep;    /* current extent entry pointer */
3049         int                     error;  /* error return value */
3050         int                     flags;  /* inode logging flags */
3051 #ifdef XFS_BMAP_TRACE
3052         static char             fname[] = "xfs_bmap_del_extent";
3053 #endif
3054         xfs_bmbt_irec_t         got;    /* current extent entry */
3055         xfs_fileoff_t           got_endoff;     /* first offset past got */
3056         int                     i;      /* temp state */
3057         xfs_ifork_t             *ifp;   /* inode fork pointer */
3058         xfs_mount_t             *mp;    /* mount structure */
3059         xfs_filblks_t           nblks;  /* quota/sb block count */
3060         xfs_bmbt_irec_t         new;    /* new record to be inserted */
3061         /* REFERENCED */
3062         uint                    qfield; /* quota field to update */
3063         xfs_filblks_t           temp;   /* for indirect length calculations */
3064         xfs_filblks_t           temp2;  /* for indirect length calculations */
3065
3066         XFS_STATS_INC(xs_del_exlist);
3067         mp = ip->i_mount;
3068         ifp = XFS_IFORK_PTR(ip, whichfork);
3069         ASSERT((idx >= 0) && (idx < ifp->if_bytes /
3070                 (uint)sizeof(xfs_bmbt_rec_t)));
3071         ASSERT(del->br_blockcount > 0);
3072         ep = xfs_iext_get_ext(ifp, idx);
3073         xfs_bmbt_get_all(ep, &got);
3074         ASSERT(got.br_startoff <= del->br_startoff);
3075         del_endoff = del->br_startoff + del->br_blockcount;
3076         got_endoff = got.br_startoff + got.br_blockcount;
3077         ASSERT(got_endoff >= del_endoff);
3078         delay = ISNULLSTARTBLOCK(got.br_startblock);
3079         ASSERT(ISNULLSTARTBLOCK(del->br_startblock) == delay);
3080         flags = 0;
3081         qfield = 0;
3082         error = 0;
3083         /*
3084          * If deleting a real allocation, must free up the disk space.
3085          */
3086         if (!delay) {
3087                 flags = XFS_ILOG_CORE;
3088                 /*
3089                  * Realtime allocation.  Free it and record di_nblocks update.
3090                  */
3091                 if (whichfork == XFS_DATA_FORK &&
3092                     (ip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
3093                         xfs_fsblock_t   bno;
3094                         xfs_filblks_t   len;
3095
3096                         ASSERT(do_mod(del->br_blockcount,
3097                                       mp->m_sb.sb_rextsize) == 0);
3098                         ASSERT(do_mod(del->br_startblock,
3099                                       mp->m_sb.sb_rextsize) == 0);
3100                         bno = del->br_startblock;
3101                         len = del->br_blockcount;
3102                         do_div(bno, mp->m_sb.sb_rextsize);
3103                         do_div(len, mp->m_sb.sb_rextsize);
3104                         if ((error = xfs_rtfree_extent(ip->i_transp, bno,
3105                                         (xfs_extlen_t)len)))
3106                                 goto done;
3107                         do_fx = 0;
3108                         nblks = len * mp->m_sb.sb_rextsize;
3109                         qfield = XFS_TRANS_DQ_RTBCOUNT;
3110                 }
3111                 /*
3112                  * Ordinary allocation.
3113                  */
3114                 else {
3115                         do_fx = 1;
3116                         nblks = del->br_blockcount;
3117                         qfield = XFS_TRANS_DQ_BCOUNT;
3118                 }
3119                 /*
3120                  * Set up del_endblock and cur for later.
3121                  */
3122                 del_endblock = del->br_startblock + del->br_blockcount;
3123                 if (cur) {
3124                         if ((error = xfs_bmbt_lookup_eq(cur, got.br_startoff,
3125                                         got.br_startblock, got.br_blockcount,
3126                                         &i)))
3127                                 goto done;
3128                         ASSERT(i == 1);
3129                 }
3130                 da_old = da_new = 0;
3131         } else {
3132                 da_old = STARTBLOCKVAL(got.br_startblock);
3133                 da_new = 0;
3134                 nblks = 0;
3135                 do_fx = 0;
3136         }
3137         /*
3138          * Set flag value to use in switch statement.
3139          * Left-contig is 2, right-contig is 1.
3140          */
3141         switch (((got.br_startoff == del->br_startoff) << 1) |
3142                 (got_endoff == del_endoff)) {
3143         case 3:
3144                 /*
3145                  * Matches the whole extent.  Delete the entry.
3146                  */
3147                 xfs_bmap_trace_delete(fname, "3", ip, idx, 1, whichfork);
3148                 xfs_iext_remove(ifp, idx, 1);
3149                 ifp->if_lastex = idx;
3150                 if (delay)
3151                         break;
3152                 XFS_IFORK_NEXT_SET(ip, whichfork,
3153                         XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
3154                 flags |= XFS_ILOG_CORE;
3155                 if (!cur) {
3156                         flags |= XFS_ILOG_FEXT(whichfork);
3157                         break;
3158                 }
3159                 if ((error = xfs_bmbt_delete(cur, &i)))
3160                         goto done;
3161                 ASSERT(i == 1);
3162                 break;
3163
3164         case 2:
3165                 /*
3166                  * Deleting the first part of the extent.
3167                  */
3168                 xfs_bmap_trace_pre_update(fname, "2", ip, idx, whichfork);
3169                 xfs_bmbt_set_startoff(ep, del_endoff);
3170                 temp = got.br_blockcount - del->br_blockcount;
3171                 xfs_bmbt_set_blockcount(ep, temp);
3172                 ifp->if_lastex = idx;
3173                 if (delay) {
3174                         temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
3175                                 da_old);
3176                         xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
3177                         xfs_bmap_trace_post_update(fname, "2", ip, idx,
3178                                 whichfork);
3179                         da_new = temp;
3180                         break;
3181                 }
3182                 xfs_bmbt_set_startblock(ep, del_endblock);
3183                 xfs_bmap_trace_post_update(fname, "2", ip, idx, whichfork);
3184                 if (!cur) {
3185                         flags |= XFS_ILOG_FEXT(whichfork);
3186                         break;
3187                 }
3188                 if ((error = xfs_bmbt_update(cur, del_endoff, del_endblock,
3189                                 got.br_blockcount - del->br_blockcount,
3190                                 got.br_state)))
3191                         goto done;
3192                 break;
3193
3194         case 1:
3195                 /*
3196                  * Deleting the last part of the extent.
3197                  */
3198                 temp = got.br_blockcount - del->br_blockcount;
3199                 xfs_bmap_trace_pre_update(fname, "1", ip, idx, whichfork);
3200                 xfs_bmbt_set_blockcount(ep, temp);
3201                 ifp->if_lastex = idx;
3202                 if (delay) {
3203                         temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
3204                                 da_old);
3205                         xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
3206                         xfs_bmap_trace_post_update(fname, "1", ip, idx,
3207                                 whichfork);
3208                         da_new = temp;
3209                         break;
3210                 }
3211                 xfs_bmap_trace_post_update(fname, "1", ip, idx, whichfork);
3212                 if (!cur) {
3213                         flags |= XFS_ILOG_FEXT(whichfork);
3214                         break;
3215                 }
3216                 if ((error = xfs_bmbt_update(cur, got.br_startoff,
3217                                 got.br_startblock,
3218                                 got.br_blockcount - del->br_blockcount,
3219                                 got.br_state)))
3220                         goto done;
3221                 break;
3222
3223         case 0:
3224                 /*
3225                  * Deleting the middle of the extent.
3226                  */
3227                 temp = del->br_startoff - got.br_startoff;
3228                 xfs_bmap_trace_pre_update(fname, "0", ip, idx, whichfork);
3229                 xfs_bmbt_set_blockcount(ep, temp);
3230                 new.br_startoff = del_endoff;
3231                 temp2 = got_endoff - del_endoff;
3232                 new.br_blockcount = temp2;
3233                 new.br_state = got.br_state;
3234                 if (!delay) {
3235                         new.br_startblock = del_endblock;
3236                         flags |= XFS_ILOG_CORE;
3237                         if (cur) {
3238                                 if ((error = xfs_bmbt_update(cur,
3239                                                 got.br_startoff,
3240                                                 got.br_startblock, temp,
3241                                                 got.br_state)))
3242                                         goto done;
3243                                 if ((error = xfs_bmbt_increment(cur, 0, &i)))
3244                                         goto done;
3245                                 cur->bc_rec.b = new;
3246                                 error = xfs_bmbt_insert(cur, &i);
3247                                 if (error && error != ENOSPC)
3248                                         goto done;
3249                                 /*
3250                                  * If get no-space back from btree insert,
3251                                  * it tried a split, and we have a zero
3252                                  * block reservation.
3253                                  * Fix up our state and return the error.
3254                                  */
3255                                 if (error == ENOSPC) {
3256                                         /*
3257                                          * Reset the cursor, don't trust
3258                                          * it after any insert operation.
3259                                          */
3260                                         if ((error = xfs_bmbt_lookup_eq(cur,
3261                                                         got.br_startoff,
3262                                                         got.br_startblock,
3263                                                         temp, &i)))
3264                                                 goto done;
3265                                         ASSERT(i == 1);
3266                                         /*
3267                                          * Update the btree record back
3268                                          * to the original value.
3269                                          */
3270                                         if ((error = xfs_bmbt_update(cur,
3271                                                         got.br_startoff,
3272                                                         got.br_startblock,
3273                                                         got.br_blockcount,
3274                                                         got.br_state)))
3275                                                 goto done;
3276                                         /*
3277                                          * Reset the extent record back
3278                                          * to the original value.
3279                                          */
3280                                         xfs_bmbt_set_blockcount(ep,
3281                                                 got.br_blockcount);
3282                                         flags = 0;
3283                                         error = XFS_ERROR(ENOSPC);
3284                                         goto done;
3285                                 }
3286                                 ASSERT(i == 1);
3287                         } else
3288                                 flags |= XFS_ILOG_FEXT(whichfork);
3289                         XFS_IFORK_NEXT_SET(ip, whichfork,
3290                                 XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
3291                 } else {
3292                         ASSERT(whichfork == XFS_DATA_FORK);
3293                         temp = xfs_bmap_worst_indlen(ip, temp);
3294                         xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
3295                         temp2 = xfs_bmap_worst_indlen(ip, temp2);
3296                         new.br_startblock = NULLSTARTBLOCK((int)temp2);
3297                         da_new = temp + temp2;
3298                         while (da_new > da_old) {
3299                                 if (temp) {
3300                                         temp--;
3301                                         da_new--;
3302                                         xfs_bmbt_set_startblock(ep,
3303                                                 NULLSTARTBLOCK((int)temp));
3304                                 }
3305                                 if (da_new == da_old)
3306                                         break;
3307                                 if (temp2) {
3308                                         temp2--;
3309                                         da_new--;
3310                                         new.br_startblock =
3311                                                 NULLSTARTBLOCK((int)temp2);
3312                                 }
3313                         }
3314                 }
3315                 xfs_bmap_trace_post_update(fname, "0", ip, idx, whichfork);
3316                 xfs_bmap_trace_insert(fname, "0", ip, idx + 1, 1, &new, NULL,
3317                         whichfork);
3318                 xfs_iext_insert(ifp, idx + 1, 1, &new);
3319                 ifp->if_lastex = idx + 1;
3320                 break;
3321         }
3322         /*
3323          * If we need to, add to list of extents to delete.
3324          */
3325         if (do_fx)
3326                 xfs_bmap_add_free(del->br_startblock, del->br_blockcount, flist,
3327                         mp);
3328         /*
3329          * Adjust inode # blocks in the file.
3330          */
3331         if (nblks)
3332                 ip->i_d.di_nblocks -= nblks;
3333         /*
3334          * Adjust quota data.
3335          */
3336         if (qfield)
3337                 XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, qfield, (long)-nblks);
3338
3339         /*
3340          * Account for change in delayed indirect blocks.
3341          * Nothing to do for disk quota accounting here.
3342          */
3343         ASSERT(da_old >= da_new);
3344         if (da_old > da_new)
3345                 xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS, (int64_t)(da_old - da_new),
3346                         rsvd);
3347         if (delta) {
3348                 /* DELTA: report the original extent. */
3349                 if (delta->xed_startoff > got.br_startoff)
3350                         delta->xed_startoff = got.br_startoff;
3351                 if (delta->xed_blockcount < got.br_startoff+got.br_blockcount)
3352                         delta->xed_blockcount = got.br_startoff +
3353                                                         got.br_blockcount;
3354         }
3355 done:
3356         *logflagsp = flags;
3357         return error;
3358 }
3359
3360 /*
3361  * Remove the entry "free" from the free item list.  Prev points to the
3362  * previous entry, unless "free" is the head of the list.
3363  */
3364 STATIC void
3365 xfs_bmap_del_free(
3366         xfs_bmap_free_t         *flist, /* free item list header */
3367         xfs_bmap_free_item_t    *prev,  /* previous item on list, if any */
3368         xfs_bmap_free_item_t    *free)  /* list item to be freed */
3369 {
3370         if (prev)
3371                 prev->xbfi_next = free->xbfi_next;
3372         else
3373                 flist->xbf_first = free->xbfi_next;
3374         flist->xbf_count--;
3375         kmem_zone_free(xfs_bmap_free_item_zone, free);
3376 }
3377
3378 /*
3379  * Convert an extents-format file into a btree-format file.
3380  * The new file will have a root block (in the inode) and a single child block.
3381  */
3382 STATIC int                                      /* error */
3383 xfs_bmap_extents_to_btree(
3384         xfs_trans_t             *tp,            /* transaction pointer */
3385         xfs_inode_t             *ip,            /* incore inode pointer */
3386         xfs_fsblock_t           *firstblock,    /* first-block-allocated */
3387         xfs_bmap_free_t         *flist,         /* blocks freed in xaction */
3388         xfs_btree_cur_t         **curp,         /* cursor returned to caller */
3389         int                     wasdel,         /* converting a delayed alloc */
3390         int                     *logflagsp,     /* inode logging flags */
3391         int                     whichfork)      /* data or attr fork */
3392 {
3393         xfs_bmbt_block_t        *ablock;        /* allocated (child) bt block */
3394         xfs_buf_t               *abp;           /* buffer for ablock */
3395         xfs_alloc_arg_t         args;           /* allocation arguments */
3396         xfs_bmbt_rec_t          *arp;           /* child record pointer */
3397         xfs_bmbt_block_t        *block;         /* btree root block */
3398         xfs_btree_cur_t         *cur;           /* bmap btree cursor */
3399         xfs_bmbt_rec_t          *ep;            /* extent record pointer */
3400         int                     error;          /* error return value */
3401         xfs_extnum_t            i, cnt;         /* extent record index */
3402         xfs_ifork_t             *ifp;           /* inode fork pointer */
3403         xfs_bmbt_key_t          *kp;            /* root block key pointer */
3404         xfs_mount_t             *mp;            /* mount structure */
3405         xfs_extnum_t            nextents;       /* number of file extents */
3406         xfs_bmbt_ptr_t          *pp;            /* root block address pointer */
3407
3408         ifp = XFS_IFORK_PTR(ip, whichfork);
3409         ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS);
3410         ASSERT(ifp->if_ext_max ==
3411                XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
3412         /*
3413          * Make space in the inode incore.
3414          */
3415         xfs_iroot_realloc(ip, 1, whichfork);
3416         ifp->if_flags |= XFS_IFBROOT;
3417         /*
3418          * Fill in the root.
3419          */
3420         block = ifp->if_broot;
3421         block->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
3422         block->bb_level = cpu_to_be16(1);
3423         block->bb_numrecs = cpu_to_be16(1);
3424         block->bb_leftsib = cpu_to_be64(NULLDFSBNO);
3425         block->bb_rightsib = cpu_to_be64(NULLDFSBNO);
3426         /*
3427          * Need a cursor.  Can't allocate until bb_level is filled in.
3428          */
3429         mp = ip->i_mount;
3430         cur = xfs_btree_init_cursor(mp, tp, NULL, 0, XFS_BTNUM_BMAP, ip,
3431                 whichfork);
3432         cur->bc_private.b.firstblock = *firstblock;
3433         cur->bc_private.b.flist = flist;
3434         cur->bc_private.b.flags = wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;
3435         /*
3436          * Convert to a btree with two levels, one record in root.
3437          */
3438         XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_BTREE);
3439         args.tp = tp;
3440         args.mp = mp;
3441         args.firstblock = *firstblock;
3442         if (*firstblock == NULLFSBLOCK) {
3443                 args.type = XFS_ALLOCTYPE_START_BNO;
3444                 args.fsbno = XFS_INO_TO_FSB(mp, ip->i_ino);
3445         } else if (flist->xbf_low) {
3446                 args.type = XFS_ALLOCTYPE_START_BNO;
3447                 args.fsbno = *firstblock;
3448         } else {
3449                 args.type = XFS_ALLOCTYPE_NEAR_BNO;
3450                 args.fsbno = *firstblock;
3451         }
3452         args.minlen = args.maxlen = args.prod = 1;
3453         args.total = args.minleft = args.alignment = args.mod = args.isfl =
3454                 args.minalignslop = 0;
3455         args.wasdel = wasdel;
3456         *logflagsp = 0;
3457         if ((error = xfs_alloc_vextent(&args))) {
3458                 xfs_iroot_realloc(ip, -1, whichfork);
3459                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
3460                 return error;
3461         }
3462         /*
3463          * Allocation can't fail, the space was reserved.
3464          */
3465         ASSERT(args.fsbno != NULLFSBLOCK);
3466         ASSERT(*firstblock == NULLFSBLOCK ||
3467                args.agno == XFS_FSB_TO_AGNO(mp, *firstblock) ||
3468                (flist->xbf_low &&
3469                 args.agno > XFS_FSB_TO_AGNO(mp, *firstblock)));
3470         *firstblock = cur->bc_private.b.firstblock = args.fsbno;
3471         cur->bc_private.b.allocated++;
3472         ip->i_d.di_nblocks++;
3473         XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
3474         abp = xfs_btree_get_bufl(mp, tp, args.fsbno, 0);
3475         /*
3476          * Fill in the child block.
3477          */
3478         ablock = XFS_BUF_TO_BMBT_BLOCK(abp);
3479         ablock->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
3480         ablock->bb_level = 0;
3481         ablock->bb_leftsib = cpu_to_be64(NULLDFSBNO);
3482         ablock->bb_rightsib = cpu_to_be64(NULLDFSBNO);
3483         arp = XFS_BMAP_REC_IADDR(ablock, 1, cur);
3484         nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
3485         for (cnt = i = 0; i < nextents; i++) {
3486                 ep = xfs_iext_get_ext(ifp, i);
3487                 if (!ISNULLSTARTBLOCK(xfs_bmbt_get_startblock(ep))) {
3488                         arp->l0 = INT_GET(ep->l0, ARCH_CONVERT);
3489                         arp->l1 = INT_GET(ep->l1, ARCH_CONVERT);
3490                         arp++; cnt++;
3491                 }
3492         }
3493         ASSERT(cnt == XFS_IFORK_NEXTENTS(ip, whichfork));
3494         ablock->bb_numrecs = cpu_to_be16(cnt);
3495         /*
3496          * Fill in the root key and pointer.
3497          */
3498         kp = XFS_BMAP_KEY_IADDR(block, 1, cur);
3499         arp = XFS_BMAP_REC_IADDR(ablock, 1, cur);
3500         kp->br_startoff = cpu_to_be64(xfs_bmbt_disk_get_startoff(arp));
3501         pp = XFS_BMAP_PTR_IADDR(block, 1, cur);
3502         *pp = cpu_to_be64(args.fsbno);
3503         /*
3504          * Do all this logging at the end so that
3505          * the root is at the right level.
3506          */
3507         xfs_bmbt_log_block(cur, abp, XFS_BB_ALL_BITS);
3508         xfs_bmbt_log_recs(cur, abp, 1, be16_to_cpu(ablock->bb_numrecs));
3509         ASSERT(*curp == NULL);
3510         *curp = cur;
3511         *logflagsp = XFS_ILOG_CORE | XFS_ILOG_FBROOT(whichfork);
3512         return 0;
3513 }
3514
3515 /*
3516  * Helper routine to reset inode di_forkoff field when switching
3517  * attribute fork from local to extent format - we reset it where
3518  * possible to make space available for inline data fork extents.
3519  */
3520 STATIC void
3521 xfs_bmap_forkoff_reset(
3522         xfs_mount_t     *mp,
3523         xfs_inode_t     *ip,
3524         int             whichfork)
3525 {
3526         if (whichfork == XFS_ATTR_FORK &&
3527             (ip->i_d.di_format != XFS_DINODE_FMT_DEV) &&
3528             (ip->i_d.di_format != XFS_DINODE_FMT_UUID) &&
3529             (ip->i_d.di_format != XFS_DINODE_FMT_BTREE) &&
3530             ((mp->m_attroffset >> 3) > ip->i_d.di_forkoff)) {
3531                 ip->i_d.di_forkoff = mp->m_attroffset >> 3;
3532                 ip->i_df.if_ext_max = XFS_IFORK_DSIZE(ip) /
3533                                         (uint)sizeof(xfs_bmbt_rec_t);
3534                 ip->i_afp->if_ext_max = XFS_IFORK_ASIZE(ip) /
3535                                         (uint)sizeof(xfs_bmbt_rec_t);
3536         }
3537 }
3538
3539 /*
3540  * Convert a local file to an extents file.
3541  * This code is out of bounds for data forks of regular files,
3542  * since the file data needs to get logged so things will stay consistent.
3543  * (The bmap-level manipulations are ok, though).
3544  */
3545 STATIC int                              /* error */
3546 xfs_bmap_local_to_extents(
3547         xfs_trans_t     *tp,            /* transaction pointer */
3548         xfs_inode_t     *ip,            /* incore inode pointer */
3549         xfs_fsblock_t   *firstblock,    /* first block allocated in xaction */
3550         xfs_extlen_t    total,          /* total blocks needed by transaction */
3551         int             *logflagsp,     /* inode logging flags */
3552         int             whichfork)      /* data or attr fork */
3553 {
3554         int             error;          /* error return value */
3555         int             flags;          /* logging flags returned */
3556 #ifdef XFS_BMAP_TRACE
3557         static char     fname[] = "xfs_bmap_local_to_extents";
3558 #endif
3559         xfs_ifork_t     *ifp;           /* inode fork pointer */
3560
3561         /*
3562          * We don't want to deal with the case of keeping inode data inline yet.
3563          * So sending the data fork of a regular inode is invalid.
3564          */
3565         ASSERT(!((ip->i_d.di_mode & S_IFMT) == S_IFREG &&
3566                  whichfork == XFS_DATA_FORK));
3567         ifp = XFS_IFORK_PTR(ip, whichfork);
3568         ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
3569         flags = 0;
3570         error = 0;
3571         if (ifp->if_bytes) {
3572                 xfs_alloc_arg_t args;   /* allocation arguments */
3573                 xfs_buf_t       *bp;    /* buffer for extent block */
3574                 xfs_bmbt_rec_t  *ep;    /* extent record pointer */
3575
3576                 args.tp = tp;
3577                 args.mp = ip->i_mount;
3578                 args.firstblock = *firstblock;
3579                 ASSERT((ifp->if_flags &
3580                         (XFS_IFINLINE|XFS_IFEXTENTS|XFS_IFEXTIREC)) == XFS_IFINLINE);
3581                 /*
3582                  * Allocate a block.  We know we need only one, since the
3583                  * file currently fits in an inode.
3584                  */
3585                 if (*firstblock == NULLFSBLOCK) {
3586                         args.fsbno = XFS_INO_TO_FSB(args.mp, ip->i_ino);
3587                         args.type = XFS_ALLOCTYPE_START_BNO;
3588                 } else {
3589                         args.fsbno = *firstblock;
3590                         args.type = XFS_ALLOCTYPE_NEAR_BNO;
3591                 }
3592                 args.total = total;
3593                 args.mod = args.minleft = args.alignment = args.wasdel =
3594                         args.isfl = args.minalignslop = 0;
3595                 args.minlen = args.maxlen = args.prod = 1;
3596                 if ((error = xfs_alloc_vextent(&args)))
3597                         goto done;
3598                 /*
3599                  * Can't fail, the space was reserved.
3600                  */
3601                 ASSERT(args.fsbno != NULLFSBLOCK);
3602                 ASSERT(args.len == 1);
3603                 *firstblock = args.fsbno;
3604                 bp = xfs_btree_get_bufl(args.mp, tp, args.fsbno, 0);
3605                 memcpy((char *)XFS_BUF_PTR(bp), ifp->if_u1.if_data,
3606                         ifp->if_bytes);
3607                 xfs_trans_log_buf(tp, bp, 0, ifp->if_bytes - 1);
3608                 xfs_bmap_forkoff_reset(args.mp, ip, whichfork);
3609                 xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
3610                 xfs_iext_add(ifp, 0, 1);
3611                 ep = xfs_iext_get_ext(ifp, 0);
3612                 xfs_bmbt_set_allf(ep, 0, args.fsbno, 1, XFS_EXT_NORM);
3613                 xfs_bmap_trace_post_update(fname, "new", ip, 0, whichfork);
3614                 XFS_IFORK_NEXT_SET(ip, whichfork, 1);
3615                 ip->i_d.di_nblocks = 1;
3616                 XFS_TRANS_MOD_DQUOT_BYINO(args.mp, tp, ip,
3617                         XFS_TRANS_DQ_BCOUNT, 1L);
3618                 flags |= XFS_ILOG_FEXT(whichfork);
3619         } else {
3620                 ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) == 0);
3621                 xfs_bmap_forkoff_reset(ip->i_mount, ip, whichfork);
3622         }
3623         ifp->if_flags &= ~XFS_IFINLINE;
3624         ifp->if_flags |= XFS_IFEXTENTS;
3625         XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
3626         flags |= XFS_ILOG_CORE;
3627 done:
3628         *logflagsp = flags;
3629         return error;
3630 }
3631
3632 /*
3633  * Search the extent records for the entry containing block bno.
3634  * If bno lies in a hole, point to the next entry.  If bno lies
3635  * past eof, *eofp will be set, and *prevp will contain the last
3636  * entry (null if none).  Else, *lastxp will be set to the index
3637  * of the found entry; *gotp will contain the entry.
3638  */
3639 xfs_bmbt_rec_t *                        /* pointer to found extent entry */
3640 xfs_bmap_search_multi_extents(
3641         xfs_ifork_t     *ifp,           /* inode fork pointer */
3642         xfs_fileoff_t   bno,            /* block number searched for */
3643         int             *eofp,          /* out: end of file found */
3644         xfs_extnum_t    *lastxp,        /* out: last extent index */
3645         xfs_bmbt_irec_t *gotp,          /* out: extent entry found */
3646         xfs_bmbt_irec_t *prevp)         /* out: previous extent entry found */
3647 {
3648         xfs_bmbt_rec_t  *ep;            /* extent record pointer */
3649         xfs_extnum_t    lastx;          /* last extent index */
3650
3651         /*
3652          * Initialize the extent entry structure to catch access to
3653          * uninitialized br_startblock field.
3654          */
3655         gotp->br_startoff = 0xffa5a5a5a5a5a5a5LL;
3656         gotp->br_blockcount = 0xa55a5a5a5a5a5a5aLL;
3657         gotp->br_state = XFS_EXT_INVALID;
3658 #if XFS_BIG_BLKNOS
3659         gotp->br_startblock = 0xffffa5a5a5a5a5a5LL;
3660 #else
3661         gotp->br_startblock = 0xffffa5a5;
3662 #endif
3663         prevp->br_startoff = NULLFILEOFF;
3664
3665         ep = xfs_iext_bno_to_ext(ifp, bno, &lastx);
3666         if (lastx > 0) {
3667                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx - 1), prevp);
3668         }
3669         if (lastx < (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
3670                 xfs_bmbt_get_all(ep, gotp);
3671                 *eofp = 0;
3672         } else {
3673                 if (lastx > 0) {
3674                         *gotp = *prevp;
3675                 }
3676                 *eofp = 1;
3677                 ep = NULL;
3678         }
3679         *lastxp = lastx;
3680         return ep;
3681 }
3682
3683 /*
3684  * Search the extents list for the inode, for the extent containing bno.
3685  * If bno lies in a hole, point to the next entry.  If bno lies past eof,
3686  * *eofp will be set, and *prevp will contain the last entry (null if none).
3687  * Else, *lastxp will be set to the index of the found
3688  * entry; *gotp will contain the entry.
3689  */
3690 STATIC xfs_bmbt_rec_t *                 /* pointer to found extent entry */
3691 xfs_bmap_search_extents(
3692         xfs_inode_t     *ip,            /* incore inode pointer */
3693         xfs_fileoff_t   bno,            /* block number searched for */
3694         int             fork,           /* data or attr fork */
3695         int             *eofp,          /* out: end of file found */
3696         xfs_extnum_t    *lastxp,        /* out: last extent index */
3697         xfs_bmbt_irec_t *gotp,          /* out: extent entry found */
3698         xfs_bmbt_irec_t *prevp)         /* out: previous extent entry found */
3699 {
3700         xfs_ifork_t     *ifp;           /* inode fork pointer */
3701         xfs_bmbt_rec_t  *ep;            /* extent record pointer */
3702
3703         XFS_STATS_INC(xs_look_exlist);
3704         ifp = XFS_IFORK_PTR(ip, fork);
3705
3706         ep = xfs_bmap_search_multi_extents(ifp, bno, eofp, lastxp, gotp, prevp);
3707
3708         if (unlikely(!(gotp->br_startblock) && (*lastxp != NULLEXTNUM) &&
3709                      !(XFS_IS_REALTIME_INODE(ip) && fork == XFS_DATA_FORK))) {
3710                 xfs_cmn_err(XFS_PTAG_FSBLOCK_ZERO, CE_ALERT, ip->i_mount,
3711                                 "Access to block zero in inode %llu "
3712                                 "start_block: %llx start_off: %llx "
3713                                 "blkcnt: %llx extent-state: %x lastx: %x\n",
3714                         (unsigned long long)ip->i_ino,
3715                         (unsigned long long)gotp->br_startblock,
3716                         (unsigned long long)gotp->br_startoff,
3717                         (unsigned long long)gotp->br_blockcount,
3718                         gotp->br_state, *lastxp);
3719                 *lastxp = NULLEXTNUM;
3720                 *eofp = 1;
3721                 return NULL;
3722         }
3723         return ep;
3724 }
3725
3726
3727 #ifdef XFS_BMAP_TRACE
3728 ktrace_t        *xfs_bmap_trace_buf;
3729
3730 /*
3731  * Add a bmap trace buffer entry.  Base routine for the others.
3732  */
3733 STATIC void
3734 xfs_bmap_trace_addentry(
3735         int             opcode,         /* operation */
3736         char            *fname,         /* function name */
3737         char            *desc,          /* operation description */
3738         xfs_inode_t     *ip,            /* incore inode pointer */
3739         xfs_extnum_t    idx,            /* index of entry(ies) */
3740         xfs_extnum_t    cnt,            /* count of entries, 1 or 2 */
3741         xfs_bmbt_rec_t  *r1,            /* first record */
3742         xfs_bmbt_rec_t  *r2,            /* second record or null */
3743         int             whichfork)      /* data or attr fork */
3744 {
3745         xfs_bmbt_rec_t  tr2;
3746
3747         ASSERT(cnt == 1 || cnt == 2);
3748         ASSERT(r1 != NULL);
3749         if (cnt == 1) {
3750                 ASSERT(r2 == NULL);
3751                 r2 = &tr2;
3752                 memset(&tr2, 0, sizeof(tr2));
3753         } else
3754                 ASSERT(r2 != NULL);
3755         ktrace_enter(xfs_bmap_trace_buf,
3756                 (void *)(__psint_t)(opcode | (whichfork << 16)),
3757                 (void *)fname, (void *)desc, (void *)ip,
3758                 (void *)(__psint_t)idx,
3759                 (void *)(__psint_t)cnt,
3760                 (void *)(__psunsigned_t)(ip->i_ino >> 32),
3761                 (void *)(__psunsigned_t)(unsigned)ip->i_ino,
3762                 (void *)(__psunsigned_t)(r1->l0 >> 32),
3763                 (void *)(__psunsigned_t)(unsigned)(r1->l0),
3764                 (void *)(__psunsigned_t)(r1->l1 >> 32),
3765                 (void *)(__psunsigned_t)(unsigned)(r1->l1),
3766                 (void *)(__psunsigned_t)(r2->l0 >> 32),
3767                 (void *)(__psunsigned_t)(unsigned)(r2->l0),
3768                 (void *)(__psunsigned_t)(r2->l1 >> 32),
3769                 (void *)(__psunsigned_t)(unsigned)(r2->l1)
3770                 );
3771         ASSERT(ip->i_xtrace);
3772         ktrace_enter(ip->i_xtrace,
3773                 (void *)(__psint_t)(opcode | (whichfork << 16)),
3774                 (void *)fname, (void *)desc, (void *)ip,
3775                 (void *)(__psint_t)idx,
3776                 (void *)(__psint_t)cnt,
3777                 (void *)(__psunsigned_t)(ip->i_ino >> 32),
3778                 (void *)(__psunsigned_t)(unsigned)ip->i_ino,
3779                 (void *)(__psunsigned_t)(r1->l0 >> 32),
3780                 (void *)(__psunsigned_t)(unsigned)(r1->l0),
3781                 (void *)(__psunsigned_t)(r1->l1 >> 32),
3782                 (void *)(__psunsigned_t)(unsigned)(r1->l1),
3783                 (void *)(__psunsigned_t)(r2->l0 >> 32),
3784                 (void *)(__psunsigned_t)(unsigned)(r2->l0),
3785                 (void *)(__psunsigned_t)(r2->l1 >> 32),
3786                 (void *)(__psunsigned_t)(unsigned)(r2->l1)
3787                 );
3788 }
3789
3790 /*
3791  * Add bmap trace entry prior to a call to xfs_iext_remove.
3792  */
3793 STATIC void
3794 xfs_bmap_trace_delete(
3795         char            *fname,         /* function name */
3796         char            *desc,          /* operation description */
3797         xfs_inode_t     *ip,            /* incore inode pointer */
3798         xfs_extnum_t    idx,            /* index of entry(entries) deleted */
3799         xfs_extnum_t    cnt,            /* count of entries deleted, 1 or 2 */
3800         int             whichfork)      /* data or attr fork */
3801 {
3802         xfs_ifork_t     *ifp;           /* inode fork pointer */
3803
3804         ifp = XFS_IFORK_PTR(ip, whichfork);
3805         xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_DELETE, fname, desc, ip, idx,
3806                 cnt, xfs_iext_get_ext(ifp, idx),
3807                 cnt == 2 ? xfs_iext_get_ext(ifp, idx + 1) : NULL,
3808                 whichfork);
3809 }
3810
3811 /*
3812  * Add bmap trace entry prior to a call to xfs_iext_insert, or
3813  * reading in the extents list from the disk (in the btree).
3814  */
3815 STATIC void
3816 xfs_bmap_trace_insert(
3817         char            *fname,         /* function name */
3818         char            *desc,          /* operation description */
3819         xfs_inode_t     *ip,            /* incore inode pointer */
3820         xfs_extnum_t    idx,            /* index of entry(entries) inserted */
3821         xfs_extnum_t    cnt,            /* count of entries inserted, 1 or 2 */
3822         xfs_bmbt_irec_t *r1,            /* inserted record 1 */
3823         xfs_bmbt_irec_t *r2,            /* inserted record 2 or null */
3824         int             whichfork)      /* data or attr fork */
3825 {
3826         xfs_bmbt_rec_t  tr1;            /* compressed record 1 */
3827         xfs_bmbt_rec_t  tr2;            /* compressed record 2 if needed */
3828
3829         xfs_bmbt_set_all(&tr1, r1);
3830         if (cnt == 2) {
3831                 ASSERT(r2 != NULL);
3832                 xfs_bmbt_set_all(&tr2, r2);
3833         } else {
3834                 ASSERT(cnt == 1);
3835                 ASSERT(r2 == NULL);
3836         }
3837         xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_INSERT, fname, desc, ip, idx,
3838                 cnt, &tr1, cnt == 2 ? &tr2 : NULL, whichfork);
3839 }
3840
3841 /*
3842  * Add bmap trace entry after updating an extent record in place.
3843  */
3844 STATIC void
3845 xfs_bmap_trace_post_update(
3846         char            *fname,         /* function name */
3847         char            *desc,          /* operation description */
3848         xfs_inode_t     *ip,            /* incore inode pointer */
3849         xfs_extnum_t    idx,            /* index of entry updated */
3850         int             whichfork)      /* data or attr fork */
3851 {
3852         xfs_ifork_t     *ifp;           /* inode fork pointer */
3853
3854         ifp = XFS_IFORK_PTR(ip, whichfork);
3855         xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_POST_UP, fname, desc, ip, idx,
3856                 1, xfs_iext_get_ext(ifp, idx), NULL, whichfork);
3857 }
3858
3859 /*
3860  * Add bmap trace entry prior to updating an extent record in place.
3861  */
3862 STATIC void
3863 xfs_bmap_trace_pre_update(
3864         char            *fname,         /* function name */
3865         char            *desc,          /* operation description */
3866         xfs_inode_t     *ip,            /* incore inode pointer */
3867         xfs_extnum_t    idx,            /* index of entry to be updated */
3868         int             whichfork)      /* data or attr fork */
3869 {
3870         xfs_ifork_t     *ifp;           /* inode fork pointer */
3871
3872         ifp = XFS_IFORK_PTR(ip, whichfork);
3873         xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_PRE_UP, fname, desc, ip, idx, 1,
3874                 xfs_iext_get_ext(ifp, idx), NULL, whichfork);
3875 }
3876 #endif  /* XFS_BMAP_TRACE */
3877
3878 /*
3879  * Compute the worst-case number of indirect blocks that will be used
3880  * for ip's delayed extent of length "len".
3881  */
3882 STATIC xfs_filblks_t
3883 xfs_bmap_worst_indlen(
3884         xfs_inode_t     *ip,            /* incore inode pointer */
3885         xfs_filblks_t   len)            /* delayed extent length */
3886 {
3887         int             level;          /* btree level number */
3888         int             maxrecs;        /* maximum record count at this level */
3889         xfs_mount_t     *mp;            /* mount structure */
3890         xfs_filblks_t   rval;           /* return value */
3891
3892         mp = ip->i_mount;
3893         maxrecs = mp->m_bmap_dmxr[0];
3894         for (level = 0, rval = 0;
3895              level < XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK);
3896              level++) {
3897                 len += maxrecs - 1;
3898                 do_div(len, maxrecs);
3899                 rval += len;
3900                 if (len == 1)
3901                         return rval + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) -
3902                                 level - 1;
3903                 if (level == 0)
3904                         maxrecs = mp->m_bmap_dmxr[1];
3905         }
3906         return rval;
3907 }
3908
3909 #if defined(XFS_RW_TRACE)
3910 STATIC void
3911 xfs_bunmap_trace(
3912         xfs_inode_t             *ip,
3913         xfs_fileoff_t           bno,
3914         xfs_filblks_t           len,
3915         int                     flags,
3916         inst_t                  *ra)
3917 {
3918         if (ip->i_rwtrace == NULL)
3919                 return;
3920         ktrace_enter(ip->i_rwtrace,
3921                 (void *)(__psint_t)XFS_BUNMAP,
3922                 (void *)ip,
3923                 (void *)(__psint_t)((ip->i_d.di_size >> 32) & 0xffffffff),
3924                 (void *)(__psint_t)(ip->i_d.di_size & 0xffffffff),
3925                 (void *)(__psint_t)(((xfs_dfiloff_t)bno >> 32) & 0xffffffff),
3926                 (void *)(__psint_t)((xfs_dfiloff_t)bno & 0xffffffff),
3927                 (void *)(__psint_t)len,
3928                 (void *)(__psint_t)flags,
3929                 (void *)(unsigned long)current_cpu(),
3930                 (void *)ra,
3931                 (void *)0,
3932                 (void *)0,
3933                 (void *)0,
3934                 (void *)0,
3935                 (void *)0,
3936                 (void *)0);
3937 }
3938 #endif
3939
3940 /*
3941  * Convert inode from non-attributed to attributed.
3942  * Must not be in a transaction, ip must not be locked.
3943  */
3944 int                                             /* error code */
3945 xfs_bmap_add_attrfork(
3946         xfs_inode_t             *ip,            /* incore inode pointer */
3947         int                     size,           /* space new attribute needs */
3948         int                     rsvd)           /* xact may use reserved blks */
3949 {
3950         xfs_fsblock_t           firstblock;     /* 1st block/ag allocated */
3951         xfs_bmap_free_t         flist;          /* freed extent records */
3952         xfs_mount_t             *mp;            /* mount structure */
3953         xfs_trans_t             *tp;            /* transaction pointer */
3954         unsigned long           s;              /* spinlock spl value */
3955         int                     blks;           /* space reservation */
3956         int                     version = 1;    /* superblock attr version */
3957         int                     committed;      /* xaction was committed */
3958         int                     logflags;       /* logging flags */
3959         int                     error;          /* error return value */
3960
3961         ASSERT(XFS_IFORK_Q(ip) == 0);
3962         ASSERT(ip->i_df.if_ext_max ==
3963                XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
3964
3965         mp = ip->i_mount;
3966         ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
3967         tp = xfs_trans_alloc(mp, XFS_TRANS_ADDAFORK);
3968         blks = XFS_ADDAFORK_SPACE_RES(mp);
3969         if (rsvd)
3970                 tp->t_flags |= XFS_TRANS_RESERVE;
3971         if ((error = xfs_trans_reserve(tp, blks, XFS_ADDAFORK_LOG_RES(mp), 0,
3972                         XFS_TRANS_PERM_LOG_RES, XFS_ADDAFORK_LOG_COUNT)))
3973                 goto error0;
3974         xfs_ilock(ip, XFS_ILOCK_EXCL);
3975         error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, blks, 0, rsvd ?
3976                         XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
3977                         XFS_QMOPT_RES_REGBLKS);
3978         if (error) {
3979                 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3980                 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES);
3981                 return error;
3982         }
3983         if (XFS_IFORK_Q(ip))
3984                 goto error1;
3985         if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS) {
3986                 /*
3987                  * For inodes coming from pre-6.2 filesystems.
3988                  */
3989                 ASSERT(ip->i_d.di_aformat == 0);
3990                 ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
3991         }
3992         ASSERT(ip->i_d.di_anextents == 0);
3993         VN_HOLD(XFS_ITOV(ip));
3994         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
3995         xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
3996         switch (ip->i_d.di_format) {
3997         case XFS_DINODE_FMT_DEV:
3998                 ip->i_d.di_forkoff = roundup(sizeof(xfs_dev_t), 8) >> 3;
3999                 break;
4000         case XFS_DINODE_FMT_UUID:
4001                 ip->i_d.di_forkoff = roundup(sizeof(uuid_t), 8) >> 3;
4002                 break;
4003         case XFS_DINODE_FMT_LOCAL:
4004         case XFS_DINODE_FMT_EXTENTS:
4005         case XFS_DINODE_FMT_BTREE:
4006                 ip->i_d.di_forkoff = xfs_attr_shortform_bytesfit(ip, size);
4007                 if (!ip->i_d.di_forkoff)
4008                         ip->i_d.di_forkoff = mp->m_attroffset >> 3;
4009                 else if (mp->m_flags & XFS_MOUNT_ATTR2)
4010                         version = 2;
4011                 break;
4012         default:
4013                 ASSERT(0);
4014                 error = XFS_ERROR(EINVAL);
4015                 goto error1;
4016         }
4017         ip->i_df.if_ext_max =
4018                 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
4019         ASSERT(ip->i_afp == NULL);
4020         ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP);
4021         ip->i_afp->if_ext_max =
4022                 XFS_IFORK_ASIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
4023         ip->i_afp->if_flags = XFS_IFEXTENTS;
4024         logflags = 0;
4025         XFS_BMAP_INIT(&flist, &firstblock);
4026         switch (ip->i_d.di_format) {
4027         case XFS_DINODE_FMT_LOCAL:
4028                 error = xfs_bmap_add_attrfork_local(tp, ip, &firstblock, &flist,
4029                         &logflags);
4030                 break;
4031         case XFS_DINODE_FMT_EXTENTS:
4032                 error = xfs_bmap_add_attrfork_extents(tp, ip, &firstblock,
4033                         &flist, &logflags);
4034                 break;
4035         case XFS_DINODE_FMT_BTREE:
4036                 error = xfs_bmap_add_attrfork_btree(tp, ip, &firstblock, &flist,
4037                         &logflags);
4038                 break;
4039         default:
4040                 error = 0;
4041                 break;
4042         }
4043         if (logflags)
4044                 xfs_trans_log_inode(tp, ip, logflags);
4045         if (error)
4046                 goto error2;
4047         if (!XFS_SB_VERSION_HASATTR(&mp->m_sb) ||
4048            (!XFS_SB_VERSION_HASATTR2(&mp->m_sb) && version == 2)) {
4049                 __int64_t sbfields = 0;
4050
4051                 s = XFS_SB_LOCK(mp);
4052                 if (!XFS_SB_VERSION_HASATTR(&mp->m_sb)) {
4053                         XFS_SB_VERSION_ADDATTR(&mp->m_sb);
4054                         sbfields |= XFS_SB_VERSIONNUM;
4055                 }
4056                 if (!XFS_SB_VERSION_HASATTR2(&mp->m_sb) && version == 2) {
4057                         XFS_SB_VERSION_ADDATTR2(&mp->m_sb);
4058                         sbfields |= (XFS_SB_VERSIONNUM | XFS_SB_FEATURES2);
4059                 }
4060                 if (sbfields) {
4061                         XFS_SB_UNLOCK(mp, s);
4062                         xfs_mod_sb(tp, sbfields);
4063                 } else
4064                         XFS_SB_UNLOCK(mp, s);
4065         }
4066         if ((error = xfs_bmap_finish(&tp, &flist, &committed)))
4067                 goto error2;
4068         error = xfs_trans_commit(tp, XFS_TRANS_PERM_LOG_RES);
4069         ASSERT(ip->i_df.if_ext_max ==
4070                XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
4071         return error;
4072 error2:
4073         xfs_bmap_cancel(&flist);
4074 error1:
4075         ASSERT(ismrlocked(&ip->i_lock,MR_UPDATE));
4076         xfs_iunlock(ip, XFS_ILOCK_EXCL);
4077 error0:
4078         xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
4079         ASSERT(ip->i_df.if_ext_max ==
4080                XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
4081         return error;
4082 }
4083
4084 /*
4085  * Add the extent to the list of extents to be free at transaction end.
4086  * The list is maintained sorted (by block number).
4087  */
4088 /* ARGSUSED */
4089 void
4090 xfs_bmap_add_free(
4091         xfs_fsblock_t           bno,            /* fs block number of extent */
4092         xfs_filblks_t           len,            /* length of extent */
4093         xfs_bmap_free_t         *flist,         /* list of extents */
4094         xfs_mount_t             *mp)            /* mount point structure */
4095 {
4096         xfs_bmap_free_item_t    *cur;           /* current (next) element */
4097         xfs_bmap_free_item_t    *new;           /* new element */
4098         xfs_bmap_free_item_t    *prev;          /* previous element */
4099 #ifdef DEBUG
4100         xfs_agnumber_t          agno;
4101         xfs_agblock_t           agbno;
4102
4103         ASSERT(bno != NULLFSBLOCK);
4104         ASSERT(len > 0);
4105         ASSERT(len <= MAXEXTLEN);
4106         ASSERT(!ISNULLSTARTBLOCK(bno));
4107         agno = XFS_FSB_TO_AGNO(mp, bno);
4108         agbno = XFS_FSB_TO_AGBNO(mp, bno);
4109         ASSERT(agno < mp->m_sb.sb_agcount);
4110         ASSERT(agbno < mp->m_sb.sb_agblocks);
4111         ASSERT(len < mp->m_sb.sb_agblocks);
4112         ASSERT(agbno + len <= mp->m_sb.sb_agblocks);
4113 #endif
4114         ASSERT(xfs_bmap_free_item_zone != NULL);
4115         new = kmem_zone_alloc(xfs_bmap_free_item_zone, KM_SLEEP);
4116         new->xbfi_startblock = bno;
4117         new->xbfi_blockcount = (xfs_extlen_t)len;
4118         for (prev = NULL, cur = flist->xbf_first;
4119              cur != NULL;
4120              prev = cur, cur = cur->xbfi_next) {
4121                 if (cur->xbfi_startblock >= bno)
4122                         break;
4123         }
4124         if (prev)
4125                 prev->xbfi_next = new;
4126         else
4127                 flist->xbf_first = new;
4128         new->xbfi_next = cur;
4129         flist->xbf_count++;
4130 }
4131
4132 /*
4133  * Compute and fill in the value of the maximum depth of a bmap btree
4134  * in this filesystem.  Done once, during mount.
4135  */
4136 void
4137 xfs_bmap_compute_maxlevels(
4138         xfs_mount_t     *mp,            /* file system mount structure */
4139         int             whichfork)      /* data or attr fork */
4140 {
4141         int             level;          /* btree level */
4142         uint            maxblocks;      /* max blocks at this level */
4143         uint            maxleafents;    /* max leaf entries possible */
4144         int             maxrootrecs;    /* max records in root block */
4145         int             minleafrecs;    /* min records in leaf block */
4146         int             minnoderecs;    /* min records in node block */
4147         int             sz;             /* root block size */
4148
4149         /*
4150          * The maximum number of extents in a file, hence the maximum
4151          * number of leaf entries, is controlled by the type of di_nextents
4152          * (a signed 32-bit number, xfs_extnum_t), or by di_anextents
4153          * (a signed 16-bit number, xfs_aextnum_t).
4154          */
4155         if (whichfork == XFS_DATA_FORK) {
4156                 maxleafents = MAXEXTNUM;
4157                 sz = (mp->m_flags & XFS_MOUNT_ATTR2) ?
4158                         XFS_BMDR_SPACE_CALC(MINDBTPTRS) : mp->m_attroffset;
4159         } else {
4160                 maxleafents = MAXAEXTNUM;
4161                 sz = (mp->m_flags & XFS_MOUNT_ATTR2) ?
4162                         XFS_BMDR_SPACE_CALC(MINABTPTRS) :
4163                         mp->m_sb.sb_inodesize - mp->m_attroffset;
4164         }
4165         maxrootrecs = (int)XFS_BTREE_BLOCK_MAXRECS(sz, xfs_bmdr, 0);
4166         minleafrecs = mp->m_bmap_dmnr[0];
4167         minnoderecs = mp->m_bmap_dmnr[1];
4168         maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs;
4169         for (level = 1; maxblocks > 1; level++) {
4170                 if (maxblocks <= maxrootrecs)
4171                         maxblocks = 1;
4172                 else
4173                         maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
4174         }
4175         mp->m_bm_maxlevels[whichfork] = level;
4176 }
4177
4178 /*
4179  * Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi
4180  * caller.  Frees all the extents that need freeing, which must be done
4181  * last due to locking considerations.  We never free any extents in
4182  * the first transaction.  This is to allow the caller to make the first
4183  * transaction a synchronous one so that the pointers to the data being
4184  * broken in this transaction will be permanent before the data is actually
4185  * freed.  This is necessary to prevent blocks from being reallocated
4186  * and written to before the free and reallocation are actually permanent.
4187  * We do not just make the first transaction synchronous here, because
4188  * there are more efficient ways to gain the same protection in some cases
4189  * (see the file truncation code).
4190  *
4191  * Return 1 if the given transaction was committed and a new one
4192  * started, and 0 otherwise in the committed parameter.
4193  */
4194 /*ARGSUSED*/
4195 int                                             /* error */
4196 xfs_bmap_finish(
4197         xfs_trans_t             **tp,           /* transaction pointer addr */
4198         xfs_bmap_free_t         *flist,         /* i/o: list extents to free */
4199         int                     *committed)     /* xact committed or not */
4200 {
4201         xfs_efd_log_item_t      *efd;           /* extent free data */
4202         xfs_efi_log_item_t      *efi;           /* extent free intention */
4203         int                     error;          /* error return value */
4204         xfs_bmap_free_item_t    *free;          /* free extent item */
4205         unsigned int            logres;         /* new log reservation */
4206         unsigned int            logcount;       /* new log count */
4207         xfs_mount_t             *mp;            /* filesystem mount structure */
4208         xfs_bmap_free_item_t    *next;          /* next item on free list */
4209         xfs_trans_t             *ntp;           /* new transaction pointer */
4210
4211         ASSERT((*tp)->t_flags & XFS_TRANS_PERM_LOG_RES);
4212         if (flist->xbf_count == 0) {
4213                 *committed = 0;
4214                 return 0;
4215         }
4216         ntp = *tp;
4217         efi = xfs_trans_get_efi(ntp, flist->xbf_count);
4218         for (free = flist->xbf_first; free; free = free->xbfi_next)
4219                 xfs_trans_log_efi_extent(ntp, efi, free->xbfi_startblock,
4220                         free->xbfi_blockcount);
4221         logres = ntp->t_log_res;
4222         logcount = ntp->t_log_count;
4223         ntp = xfs_trans_dup(*tp);
4224         error = xfs_trans_commit(*tp, 0);
4225         *tp = ntp;
4226         *committed = 1;
4227         /*
4228          * We have a new transaction, so we should return committed=1,
4229          * even though we're returning an error.
4230          */
4231         if (error) {
4232                 return error;
4233         }
4234         if ((error = xfs_trans_reserve(ntp, 0, logres, 0, XFS_TRANS_PERM_LOG_RES,
4235                         logcount)))
4236                 return error;
4237         efd = xfs_trans_get_efd(ntp, efi, flist->xbf_count);
4238         for (free = flist->xbf_first; free != NULL; free = next) {
4239                 next = free->xbfi_next;
4240                 if ((error = xfs_free_extent(ntp, free->xbfi_startblock,
4241                                 free->xbfi_blockcount))) {
4242                         /*
4243                          * The bmap free list will be cleaned up at a
4244                          * higher level.  The EFI will be canceled when
4245                          * this transaction is aborted.
4246                          * Need to force shutdown here to make sure it
4247                          * happens, since this transaction may not be
4248                          * dirty yet.
4249                          */
4250                         mp = ntp->t_mountp;
4251                         if (!XFS_FORCED_SHUTDOWN(mp))
4252                                 xfs_force_shutdown(mp,
4253                                                    (error == EFSCORRUPTED) ?
4254                                                    SHUTDOWN_CORRUPT_INCORE :
4255                                                    SHUTDOWN_META_IO_ERROR);
4256                         return error;
4257                 }
4258                 xfs_trans_log_efd_extent(ntp, efd, free->xbfi_startblock,
4259                         free->xbfi_blockcount);
4260                 xfs_bmap_del_free(flist, NULL, free);
4261         }
4262         return 0;
4263 }
4264
4265 /*
4266  * Free up any items left in the list.
4267  */
4268 void
4269 xfs_bmap_cancel(
4270         xfs_bmap_free_t         *flist) /* list of bmap_free_items */
4271 {
4272         xfs_bmap_free_item_t    *free;  /* free list item */
4273         xfs_bmap_free_item_t    *next;
4274
4275         if (flist->xbf_count == 0)
4276                 return;
4277         ASSERT(flist->xbf_first != NULL);
4278         for (free = flist->xbf_first; free; free = next) {
4279                 next = free->xbfi_next;
4280                 xfs_bmap_del_free(flist, NULL, free);
4281         }
4282         ASSERT(flist->xbf_count == 0);
4283 }
4284
4285 /*
4286  * Returns the file-relative block number of the first unused block(s)
4287  * in the file with at least "len" logically contiguous blocks free.
4288  * This is the lowest-address hole if the file has holes, else the first block
4289  * past the end of file.
4290  * Return 0 if the file is currently local (in-inode).
4291  */
4292 int                                             /* error */
4293 xfs_bmap_first_unused(
4294         xfs_trans_t     *tp,                    /* transaction pointer */
4295         xfs_inode_t     *ip,                    /* incore inode */
4296         xfs_extlen_t    len,                    /* size of hole to find */
4297         xfs_fileoff_t   *first_unused,          /* unused block */
4298         int             whichfork)              /* data or attr fork */
4299 {
4300         xfs_bmbt_rec_t  *ep;                    /* pointer to an extent entry */
4301         int             error;                  /* error return value */
4302         int             idx;                    /* extent record index */
4303         xfs_ifork_t     *ifp;                   /* inode fork pointer */
4304         xfs_fileoff_t   lastaddr;               /* last block number seen */
4305         xfs_fileoff_t   lowest;                 /* lowest useful block */
4306         xfs_fileoff_t   max;                    /* starting useful block */
4307         xfs_fileoff_t   off;                    /* offset for this block */
4308         xfs_extnum_t    nextents;               /* number of extent entries */
4309
4310         ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE ||
4311                XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ||
4312                XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
4313         if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4314                 *first_unused = 0;
4315                 return 0;
4316         }
4317         ifp = XFS_IFORK_PTR(ip, whichfork);
4318         if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4319             (error = xfs_iread_extents(tp, ip, whichfork)))
4320                 return error;
4321         lowest = *first_unused;
4322         nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4323         for (idx = 0, lastaddr = 0, max = lowest; idx < nextents; idx++) {
4324                 ep = xfs_iext_get_ext(ifp, idx);
4325                 off = xfs_bmbt_get_startoff(ep);
4326                 /*
4327                  * See if the hole before this extent will work.
4328                  */
4329                 if (off >= lowest + len && off - max >= len) {
4330                         *first_unused = max;
4331                         return 0;
4332                 }
4333                 lastaddr = off + xfs_bmbt_get_blockcount(ep);
4334                 max = XFS_FILEOFF_MAX(lastaddr, lowest);
4335         }
4336         *first_unused = max;
4337         return 0;
4338 }
4339
4340 /*
4341  * Returns the file-relative block number of the last block + 1 before
4342  * last_block (input value) in the file.
4343  * This is not based on i_size, it is based on the extent records.
4344  * Returns 0 for local files, as they do not have extent records.
4345  */
4346 int                                             /* error */
4347 xfs_bmap_last_before(
4348         xfs_trans_t     *tp,                    /* transaction pointer */
4349         xfs_inode_t     *ip,                    /* incore inode */
4350         xfs_fileoff_t   *last_block,            /* last block */
4351         int             whichfork)              /* data or attr fork */
4352 {
4353         xfs_fileoff_t   bno;                    /* input file offset */
4354         int             eof;                    /* hit end of file */
4355         xfs_bmbt_rec_t  *ep;                    /* pointer to last extent */
4356         int             error;                  /* error return value */
4357         xfs_bmbt_irec_t got;                    /* current extent value */
4358         xfs_ifork_t     *ifp;                   /* inode fork pointer */
4359         xfs_extnum_t    lastx;                  /* last extent used */
4360         xfs_bmbt_irec_t prev;                   /* previous extent value */
4361
4362         if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
4363             XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4364             XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
4365                return XFS_ERROR(EIO);
4366         if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4367                 *last_block = 0;
4368                 return 0;
4369         }
4370         ifp = XFS_IFORK_PTR(ip, whichfork);
4371         if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4372             (error = xfs_iread_extents(tp, ip, whichfork)))
4373                 return error;
4374         bno = *last_block - 1;
4375         ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
4376                 &prev);
4377         if (eof || xfs_bmbt_get_startoff(ep) > bno) {
4378                 if (prev.br_startoff == NULLFILEOFF)
4379                         *last_block = 0;
4380                 else
4381                         *last_block = prev.br_startoff + prev.br_blockcount;
4382         }
4383         /*
4384          * Otherwise *last_block is already the right answer.
4385          */
4386         return 0;
4387 }
4388
4389 /*
4390  * Returns the file-relative block number of the first block past eof in
4391  * the file.  This is not based on i_size, it is based on the extent records.
4392  * Returns 0 for local files, as they do not have extent records.
4393  */
4394 int                                             /* error */
4395 xfs_bmap_last_offset(
4396         xfs_trans_t     *tp,                    /* transaction pointer */
4397         xfs_inode_t     *ip,                    /* incore inode */
4398         xfs_fileoff_t   *last_block,            /* last block */
4399         int             whichfork)              /* data or attr fork */
4400 {
4401         xfs_bmbt_rec_t  *ep;                    /* pointer to last extent */
4402         int             error;                  /* error return value */
4403         xfs_ifork_t     *ifp;                   /* inode fork pointer */
4404         xfs_extnum_t    nextents;               /* number of extent entries */
4405
4406         if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
4407             XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4408             XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
4409                return XFS_ERROR(EIO);
4410         if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4411                 *last_block = 0;
4412                 return 0;
4413         }
4414         ifp = XFS_IFORK_PTR(ip, whichfork);
4415         if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4416             (error = xfs_iread_extents(tp, ip, whichfork)))
4417                 return error;
4418         nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4419         if (!nextents) {
4420                 *last_block = 0;
4421                 return 0;
4422         }
4423         ep = xfs_iext_get_ext(ifp, nextents - 1);
4424         *last_block = xfs_bmbt_get_startoff(ep) + xfs_bmbt_get_blockcount(ep);
4425         return 0;
4426 }
4427
4428 /*
4429  * Returns whether the selected fork of the inode has exactly one
4430  * block or not.  For the data fork we check this matches di_size,
4431  * implying the file's range is 0..bsize-1.
4432  */
4433 int                                     /* 1=>1 block, 0=>otherwise */
4434 xfs_bmap_one_block(
4435         xfs_inode_t     *ip,            /* incore inode */
4436         int             whichfork)      /* data or attr fork */
4437 {
4438         xfs_bmbt_rec_t  *ep;            /* ptr to fork's extent */
4439         xfs_ifork_t     *ifp;           /* inode fork pointer */
4440         int             rval;           /* return value */
4441         xfs_bmbt_irec_t s;              /* internal version of extent */
4442
4443 #ifndef DEBUG
4444         if (whichfork == XFS_DATA_FORK) {
4445                 return ((ip->i_d.di_mode & S_IFMT) == S_IFREG) ?
4446                         (ip->i_size == ip->i_mount->m_sb.sb_blocksize) :
4447                         (ip->i_d.di_size == ip->i_mount->m_sb.sb_blocksize);
4448         }
4449 #endif  /* !DEBUG */
4450         if (XFS_IFORK_NEXTENTS(ip, whichfork) != 1)
4451                 return 0;
4452         if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
4453                 return 0;
4454         ifp = XFS_IFORK_PTR(ip, whichfork);
4455         ASSERT(ifp->if_flags & XFS_IFEXTENTS);
4456         ep = xfs_iext_get_ext(ifp, 0);
4457         xfs_bmbt_get_all(ep, &s);
4458         rval = s.br_startoff == 0 && s.br_blockcount == 1;
4459         if (rval && whichfork == XFS_DATA_FORK)
4460                 ASSERT(ip->i_size == ip->i_mount->m_sb.sb_blocksize);
4461         return rval;
4462 }
4463
4464 /*
4465  * Read in the extents to if_extents.
4466  * All inode fields are set up by caller, we just traverse the btree
4467  * and copy the records in. If the file system cannot contain unwritten
4468  * extents, the records are checked for no "state" flags.
4469  */
4470 int                                     /* error */
4471 xfs_bmap_read_extents(
4472         xfs_trans_t             *tp,    /* transaction pointer */
4473         xfs_inode_t             *ip,    /* incore inode */
4474         int                     whichfork) /* data or attr fork */
4475 {
4476         xfs_bmbt_block_t        *block; /* current btree block */
4477         xfs_fsblock_t           bno;    /* block # of "block" */
4478         xfs_buf_t               *bp;    /* buffer for "block" */
4479         int                     error;  /* error return value */
4480         xfs_exntfmt_t           exntf;  /* XFS_EXTFMT_NOSTATE, if checking */
4481 #ifdef XFS_BMAP_TRACE
4482         static char             fname[] = "xfs_bmap_read_extents";
4483 #endif
4484         xfs_extnum_t            i, j;   /* index into the extents list */
4485         xfs_ifork_t             *ifp;   /* fork structure */
4486         int                     level;  /* btree level, for checking */
4487         xfs_mount_t             *mp;    /* file system mount structure */
4488         __be64                  *pp;    /* pointer to block address */
4489         /* REFERENCED */
4490         xfs_extnum_t            room;   /* number of entries there's room for */
4491
4492         bno = NULLFSBLOCK;
4493         mp = ip->i_mount;
4494         ifp = XFS_IFORK_PTR(ip, whichfork);
4495         exntf = (whichfork != XFS_DATA_FORK) ? XFS_EXTFMT_NOSTATE :
4496                                         XFS_EXTFMT_INODE(ip);
4497         block = ifp->if_broot;
4498         /*
4499          * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
4500          */
4501         level = be16_to_cpu(block->bb_level);
4502         ASSERT(level > 0);
4503         pp = XFS_BMAP_BROOT_PTR_ADDR(block, 1, ifp->if_broot_bytes);
4504         bno = be64_to_cpu(*pp);
4505         ASSERT(bno != NULLDFSBNO);
4506         ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
4507         ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
4508         /*
4509          * Go down the tree until leaf level is reached, following the first
4510          * pointer (leftmost) at each level.
4511          */
4512         while (level-- > 0) {
4513                 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
4514                                 XFS_BMAP_BTREE_REF)))
4515                         return error;
4516                 block = XFS_BUF_TO_BMBT_BLOCK(bp);
4517                 XFS_WANT_CORRUPTED_GOTO(
4518                         XFS_BMAP_SANITY_CHECK(mp, block, level),
4519                         error0);
4520                 if (level == 0)
4521                         break;
4522                 pp = XFS_BTREE_PTR_ADDR(xfs_bmbt, block, 1, mp->m_bmap_dmxr[1]);
4523                 bno = be64_to_cpu(*pp);
4524                 XFS_WANT_CORRUPTED_GOTO(XFS_FSB_SANITY_CHECK(mp, bno), error0);
4525                 xfs_trans_brelse(tp, bp);
4526         }
4527         /*
4528          * Here with bp and block set to the leftmost leaf node in the tree.
4529          */
4530         room = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4531         i = 0;
4532         /*
4533          * Loop over all leaf nodes.  Copy information to the extent records.
4534          */
4535         for (;;) {
4536                 xfs_bmbt_rec_t  *frp, *trp;
4537                 xfs_fsblock_t   nextbno;
4538                 xfs_extnum_t    num_recs;
4539                 xfs_extnum_t    start;
4540
4541
4542                 num_recs = be16_to_cpu(block->bb_numrecs);
4543                 if (unlikely(i + num_recs > room)) {
4544                         ASSERT(i + num_recs <= room);
4545                         xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
4546                                 "corrupt dinode %Lu, (btree extents).",
4547                                 (unsigned long long) ip->i_ino);
4548                         XFS_ERROR_REPORT("xfs_bmap_read_extents(1)",
4549                                          XFS_ERRLEVEL_LOW,
4550                                         ip->i_mount);
4551                         goto error0;
4552                 }
4553                 XFS_WANT_CORRUPTED_GOTO(
4554                         XFS_BMAP_SANITY_CHECK(mp, block, 0),
4555                         error0);
4556                 /*
4557                  * Read-ahead the next leaf block, if any.
4558                  */
4559                 nextbno = be64_to_cpu(block->bb_rightsib);
4560                 if (nextbno != NULLFSBLOCK)
4561                         xfs_btree_reada_bufl(mp, nextbno, 1);
4562                 /*
4563                  * Copy records into the extent records.
4564                  */
4565                 frp = XFS_BTREE_REC_ADDR(xfs_bmbt, block, 1);
4566                 start = i;
4567                 for (j = 0; j < num_recs; j++, i++, frp++) {
4568                         trp = xfs_iext_get_ext(ifp, i);
4569                         trp->l0 = INT_GET(frp->l0, ARCH_CONVERT);
4570                         trp->l1 = INT_GET(frp->l1, ARCH_CONVERT);
4571                 }
4572                 if (exntf == XFS_EXTFMT_NOSTATE) {
4573                         /*
4574                          * Check all attribute bmap btree records and
4575                          * any "older" data bmap btree records for a
4576                          * set bit in the "extent flag" position.
4577                          */
4578                         if (unlikely(xfs_check_nostate_extents(ifp,
4579                                         start, num_recs))) {
4580                                 XFS_ERROR_REPORT("xfs_bmap_read_extents(2)",
4581                                                  XFS_ERRLEVEL_LOW,
4582                                                  ip->i_mount);
4583                                 goto error0;
4584                         }
4585                 }
4586                 xfs_trans_brelse(tp, bp);
4587                 bno = nextbno;
4588                 /*
4589                  * If we've reached the end, stop.
4590                  */
4591                 if (bno == NULLFSBLOCK)
4592                         break;
4593                 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
4594                                 XFS_BMAP_BTREE_REF)))
4595                         return error;
4596                 block = XFS_BUF_TO_BMBT_BLOCK(bp);
4597         }
4598         ASSERT(i == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)));
4599         ASSERT(i == XFS_IFORK_NEXTENTS(ip, whichfork));
4600         xfs_bmap_trace_exlist(fname, ip, i, whichfork);
4601         return 0;
4602 error0:
4603         xfs_trans_brelse(tp, bp);
4604         return XFS_ERROR(EFSCORRUPTED);
4605 }
4606
4607 #ifdef XFS_BMAP_TRACE
4608 /*
4609  * Add bmap trace insert entries for all the contents of the extent records.
4610  */
4611 void
4612 xfs_bmap_trace_exlist(
4613         char            *fname,         /* function name */
4614         xfs_inode_t     *ip,            /* incore inode pointer */
4615         xfs_extnum_t    cnt,            /* count of entries in the list */
4616         int             whichfork)      /* data or attr fork */
4617 {
4618         xfs_bmbt_rec_t  *ep;            /* current extent record */
4619         xfs_extnum_t    idx;            /* extent record index */
4620         xfs_ifork_t     *ifp;           /* inode fork pointer */
4621         xfs_bmbt_irec_t s;              /* file extent record */
4622
4623         ifp = XFS_IFORK_PTR(ip, whichfork);
4624         ASSERT(cnt == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)));
4625         for (idx = 0; idx < cnt; idx++) {
4626                 ep = xfs_iext_get_ext(ifp, idx);
4627                 xfs_bmbt_get_all(ep, &s);
4628                 xfs_bmap_trace_insert(fname, "exlist", ip, idx, 1, &s, NULL,
4629                         whichfork);
4630         }
4631 }
4632 #endif
4633
4634 #ifdef DEBUG
4635 /*
4636  * Validate that the bmbt_irecs being returned from bmapi are valid
4637  * given the callers original parameters.  Specifically check the
4638  * ranges of the returned irecs to ensure that they only extent beyond
4639  * the given parameters if the XFS_BMAPI_ENTIRE flag was set.
4640  */
4641 STATIC void
4642 xfs_bmap_validate_ret(
4643         xfs_fileoff_t           bno,
4644         xfs_filblks_t           len,
4645         int                     flags,
4646         xfs_bmbt_irec_t         *mval,
4647         int                     nmap,
4648         int                     ret_nmap)
4649 {
4650         int                     i;              /* index to map values */
4651
4652         ASSERT(ret_nmap <= nmap);
4653
4654         for (i = 0; i < ret_nmap; i++) {
4655                 ASSERT(mval[i].br_blockcount > 0);
4656                 if (!(flags & XFS_BMAPI_ENTIRE)) {
4657                         ASSERT(mval[i].br_startoff >= bno);
4658                         ASSERT(mval[i].br_blockcount <= len);
4659                         ASSERT(mval[i].br_startoff + mval[i].br_blockcount <=
4660                                bno + len);
4661                 } else {
4662                         ASSERT(mval[i].br_startoff < bno + len);
4663                         ASSERT(mval[i].br_startoff + mval[i].br_blockcount >
4664                                bno);
4665                 }
4666                 ASSERT(i == 0 ||
4667                        mval[i - 1].br_startoff + mval[i - 1].br_blockcount ==
4668                        mval[i].br_startoff);
4669                 if ((flags & XFS_BMAPI_WRITE) && !(flags & XFS_BMAPI_DELAY))
4670                         ASSERT(mval[i].br_startblock != DELAYSTARTBLOCK &&
4671                                mval[i].br_startblock != HOLESTARTBLOCK);
4672                 ASSERT(mval[i].br_state == XFS_EXT_NORM ||
4673                        mval[i].br_state == XFS_EXT_UNWRITTEN);
4674         }
4675 }
4676 #endif /* DEBUG */
4677
4678
4679 /*
4680  * Map file blocks to filesystem blocks.
4681  * File range is given by the bno/len pair.
4682  * Adds blocks to file if a write ("flags & XFS_BMAPI_WRITE" set)
4683  * into a hole or past eof.
4684  * Only allocates blocks from a single allocation group,
4685  * to avoid locking problems.
4686  * The returned value in "firstblock" from the first call in a transaction
4687  * must be remembered and presented to subsequent calls in "firstblock".
4688  * An upper bound for the number of blocks to be allocated is supplied to
4689  * the first call in "total"; if no allocation group has that many free
4690  * blocks then the call will fail (return NULLFSBLOCK in "firstblock").
4691  */
4692 int                                     /* error */
4693 xfs_bmapi(
4694         xfs_trans_t     *tp,            /* transaction pointer */
4695         xfs_inode_t     *ip,            /* incore inode */
4696         xfs_fileoff_t   bno,            /* starting file offs. mapped */
4697         xfs_filblks_t   len,            /* length to map in file */
4698         int             flags,          /* XFS_BMAPI_... */
4699         xfs_fsblock_t   *firstblock,    /* first allocated block
4700                                            controls a.g. for allocs */
4701         xfs_extlen_t    total,          /* total blocks needed */
4702         xfs_bmbt_irec_t *mval,          /* output: map values */
4703         int             *nmap,          /* i/o: mval size/count */
4704         xfs_bmap_free_t *flist,         /* i/o: list extents to free */
4705         xfs_extdelta_t  *delta)         /* o: change made to incore extents */
4706 {
4707         xfs_fsblock_t   abno;           /* allocated block number */
4708         xfs_extlen_t    alen;           /* allocated extent length */
4709         xfs_fileoff_t   aoff;           /* allocated file offset */
4710         xfs_bmalloca_t  bma;            /* args for xfs_bmap_alloc */
4711         xfs_btree_cur_t *cur;           /* bmap btree cursor */
4712         xfs_fileoff_t   end;            /* end of mapped file region */
4713         int             eof;            /* we've hit the end of extents */
4714         xfs_bmbt_rec_t  *ep;            /* extent record pointer */
4715         int             error;          /* error return */
4716         xfs_bmbt_irec_t got;            /* current file extent record */
4717         xfs_ifork_t     *ifp;           /* inode fork pointer */
4718         xfs_extlen_t    indlen;         /* indirect blocks length */
4719         xfs_extnum_t    lastx;          /* last useful extent number */
4720         int             logflags;       /* flags for transaction logging */
4721         xfs_extlen_t    minleft;        /* min blocks left after allocation */
4722         xfs_extlen_t    minlen;         /* min allocation size */
4723         xfs_mount_t     *mp;            /* xfs mount structure */
4724         int             n;              /* current extent index */
4725         int             nallocs;        /* number of extents alloc\'d */
4726         xfs_extnum_t    nextents;       /* number of extents in file */
4727         xfs_fileoff_t   obno;           /* old block number (offset) */
4728         xfs_bmbt_irec_t prev;           /* previous file extent record */
4729         int             tmp_logflags;   /* temp flags holder */
4730         int             whichfork;      /* data or attr fork */
4731         char            inhole;         /* current location is hole in file */
4732         char            wasdelay;       /* old extent was delayed */
4733         char            wr;             /* this is a write request */
4734         char            rt;             /* this is a realtime file */
4735 #ifdef DEBUG
4736         xfs_fileoff_t   orig_bno;       /* original block number value */
4737         int             orig_flags;     /* original flags arg value */
4738         xfs_filblks_t   orig_len;       /* original value of len arg */
4739         xfs_bmbt_irec_t *orig_mval;     /* original value of mval */
4740         int             orig_nmap;      /* original value of *nmap */
4741
4742         orig_bno = bno;
4743         orig_len = len;
4744         orig_flags = flags;
4745         orig_mval = mval;
4746         orig_nmap = *nmap;
4747 #endif
4748         ASSERT(*nmap >= 1);
4749         ASSERT(*nmap <= XFS_BMAP_MAX_NMAP || !(flags & XFS_BMAPI_WRITE));
4750         whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
4751                 XFS_ATTR_FORK : XFS_DATA_FORK;
4752         mp = ip->i_mount;
4753         if (unlikely(XFS_TEST_ERROR(
4754             (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4755              XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
4756              XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL),
4757              mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
4758                 XFS_ERROR_REPORT("xfs_bmapi", XFS_ERRLEVEL_LOW, mp);
4759                 return XFS_ERROR(EFSCORRUPTED);
4760         }
4761         if (XFS_FORCED_SHUTDOWN(mp))
4762                 return XFS_ERROR(EIO);
4763         rt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
4764         ifp = XFS_IFORK_PTR(ip, whichfork);
4765         ASSERT(ifp->if_ext_max ==
4766                XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
4767         if ((wr = (flags & XFS_BMAPI_WRITE)) != 0)
4768                 XFS_STATS_INC(xs_blk_mapw);
4769         else
4770                 XFS_STATS_INC(xs_blk_mapr);
4771         /*
4772          * IGSTATE flag is used to combine extents which
4773          * differ only due to the state of the extents.
4774          * This technique is used from xfs_getbmap()
4775          * when the caller does not wish to see the
4776          * separation (which is the default).
4777          *
4778          * This technique is also used when writing a
4779          * buffer which has been partially written,
4780          * (usually by being flushed during a chunkread),
4781          * to ensure one write takes place. This also
4782          * prevents a change in the xfs inode extents at
4783          * this time, intentionally. This change occurs
4784          * on completion of the write operation, in
4785          * xfs_strat_comp(), where the xfs_bmapi() call
4786          * is transactioned, and the extents combined.
4787          */
4788         if ((flags & XFS_BMAPI_IGSTATE) && wr)  /* if writing unwritten space */
4789                 wr = 0;                         /* no allocations are allowed */
4790         ASSERT(wr || !(flags & XFS_BMAPI_DELAY));
4791         logflags = 0;
4792         nallocs = 0;
4793         cur = NULL;
4794         if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4795                 ASSERT(wr && tp);
4796                 if ((error = xfs_bmap_local_to_extents(tp, ip,
4797                                 firstblock, total, &logflags, whichfork)))
4798                         goto error0;
4799         }
4800         if (wr && *firstblock == NULLFSBLOCK) {
4801                 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE)
4802                         minleft = be16_to_cpu(ifp->if_broot->bb_level) + 1;
4803                 else
4804                         minleft = 1;
4805         } else
4806                 minleft = 0;
4807         if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4808             (error = xfs_iread_extents(tp, ip, whichfork)))
4809                 goto error0;
4810         ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
4811                 &prev);
4812         nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4813         n = 0;
4814         end = bno + len;
4815         obno = bno;
4816         bma.ip = NULL;
4817         if (delta) {
4818                 delta->xed_startoff = NULLFILEOFF;
4819                 delta->xed_blockcount = 0;
4820         }
4821         while (bno < end && n < *nmap) {
4822                 /*
4823                  * Reading past eof, act as though there's a hole
4824                  * up to end.
4825                  */
4826                 if (eof && !wr)
4827                         got.br_startoff = end;
4828                 inhole = eof || got.br_startoff > bno;
4829                 wasdelay = wr && !inhole && !(flags & XFS_BMAPI_DELAY) &&
4830                         ISNULLSTARTBLOCK(got.br_startblock);
4831                 /*
4832                  * First, deal with the hole before the allocated space
4833                  * that we found, if any.
4834                  */
4835                 if (wr && (inhole || wasdelay)) {
4836                         /*
4837                          * For the wasdelay case, we could also just
4838                          * allocate the stuff asked for in this bmap call
4839                          * but that wouldn't be as good.
4840                          */
4841                         if (wasdelay && !(flags & XFS_BMAPI_EXACT)) {
4842                                 alen = (xfs_extlen_t)got.br_blockcount;
4843                                 aoff = got.br_startoff;
4844                                 if (lastx != NULLEXTNUM && lastx) {
4845                                         ep = xfs_iext_get_ext(ifp, lastx - 1);
4846                                         xfs_bmbt_get_all(ep, &prev);
4847                                 }
4848                         } else if (wasdelay) {
4849                                 alen = (xfs_extlen_t)
4850                                         XFS_FILBLKS_MIN(len,
4851                                                 (got.br_startoff +
4852                                                  got.br_blockcount) - bno);
4853                                 aoff = bno;
4854                         } else {
4855                                 alen = (xfs_extlen_t)
4856                                         XFS_FILBLKS_MIN(len, MAXEXTLEN);