dquot: move dquot drop responsibility into the filesystem
[linux-2.6.git] / fs / udf / inode.c
1 /*
2  * inode.c
3  *
4  * PURPOSE
5  *  Inode handling routines for the OSTA-UDF(tm) filesystem.
6  *
7  * COPYRIGHT
8  *  This file is distributed under the terms of the GNU General Public
9  *  License (GPL). Copies of the GPL can be obtained from:
10  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
11  *  Each contributing author retains all rights to their own work.
12  *
13  *  (C) 1998 Dave Boynton
14  *  (C) 1998-2004 Ben Fennema
15  *  (C) 1999-2000 Stelias Computing Inc
16  *
17  * HISTORY
18  *
19  *  10/04/98 dgb  Added rudimentary directory functions
20  *  10/07/98      Fully working udf_block_map! It works!
21  *  11/25/98      bmap altered to better support extents
22  *  12/06/98 blf  partition support in udf_iget, udf_block_map
23  *                and udf_read_inode
24  *  12/12/98      rewrote udf_block_map to handle next extents and descs across
25  *                block boundaries (which is not actually allowed)
26  *  12/20/98      added support for strategy 4096
27  *  03/07/99      rewrote udf_block_map (again)
28  *                New funcs, inode_bmap, udf_next_aext
29  *  04/19/99      Support for writing device EA's for major/minor #
30  */
31
32 #include "udfdecl.h"
33 #include <linux/mm.h>
34 #include <linux/smp_lock.h>
35 #include <linux/module.h>
36 #include <linux/pagemap.h>
37 #include <linux/buffer_head.h>
38 #include <linux/writeback.h>
39 #include <linux/slab.h>
40 #include <linux/crc-itu-t.h>
41
42 #include "udf_i.h"
43 #include "udf_sb.h"
44
45 MODULE_AUTHOR("Ben Fennema");
46 MODULE_DESCRIPTION("Universal Disk Format Filesystem");
47 MODULE_LICENSE("GPL");
48
49 #define EXTENT_MERGE_SIZE 5
50
51 static mode_t udf_convert_permissions(struct fileEntry *);
52 static int udf_update_inode(struct inode *, int);
53 static void udf_fill_inode(struct inode *, struct buffer_head *);
54 static int udf_alloc_i_data(struct inode *inode, size_t size);
55 static struct buffer_head *inode_getblk(struct inode *, sector_t, int *,
56                                         sector_t *, int *);
57 static int8_t udf_insert_aext(struct inode *, struct extent_position,
58                               struct kernel_lb_addr, uint32_t);
59 static void udf_split_extents(struct inode *, int *, int, int,
60                               struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
61 static void udf_prealloc_extents(struct inode *, int, int,
62                                  struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
63 static void udf_merge_extents(struct inode *,
64                               struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
65 static void udf_update_extents(struct inode *,
66                                struct kernel_long_ad[EXTENT_MERGE_SIZE], int, int,
67                                struct extent_position *);
68 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
69
70
71 void udf_delete_inode(struct inode *inode)
72 {
73         truncate_inode_pages(&inode->i_data, 0);
74
75         if (is_bad_inode(inode))
76                 goto no_delete;
77
78         inode->i_size = 0;
79         udf_truncate(inode);
80         lock_kernel();
81
82         udf_update_inode(inode, IS_SYNC(inode));
83         udf_free_inode(inode);
84
85         unlock_kernel();
86         return;
87
88 no_delete:
89         clear_inode(inode);
90 }
91
92 /*
93  * If we are going to release inode from memory, we truncate last inode extent
94  * to proper length. We could use drop_inode() but it's called under inode_lock
95  * and thus we cannot mark inode dirty there.  We use clear_inode() but we have
96  * to make sure to write inode as it's not written automatically.
97  */
98 void udf_clear_inode(struct inode *inode)
99 {
100         struct udf_inode_info *iinfo = UDF_I(inode);
101
102         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
103             inode->i_size != iinfo->i_lenExtents) {
104                 printk(KERN_WARNING "UDF-fs (%s): Inode %lu (mode %o) has "
105                         "inode size %llu different from extent lenght %llu. "
106                         "Filesystem need not be standards compliant.\n",
107                         inode->i_sb->s_id, inode->i_ino, inode->i_mode,
108                         (unsigned long long)inode->i_size,
109                         (unsigned long long)iinfo->i_lenExtents);
110         }
111
112         vfs_dq_drop(inode);
113         kfree(iinfo->i_ext.i_data);
114         iinfo->i_ext.i_data = NULL;
115 }
116
117 static int udf_writepage(struct page *page, struct writeback_control *wbc)
118 {
119         return block_write_full_page(page, udf_get_block, wbc);
120 }
121
122 static int udf_readpage(struct file *file, struct page *page)
123 {
124         return block_read_full_page(page, udf_get_block);
125 }
126
127 static int udf_write_begin(struct file *file, struct address_space *mapping,
128                         loff_t pos, unsigned len, unsigned flags,
129                         struct page **pagep, void **fsdata)
130 {
131         *pagep = NULL;
132         return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
133                                 udf_get_block);
134 }
135
136 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
137 {
138         return generic_block_bmap(mapping, block, udf_get_block);
139 }
140
141 const struct address_space_operations udf_aops = {
142         .readpage       = udf_readpage,
143         .writepage      = udf_writepage,
144         .sync_page      = block_sync_page,
145         .write_begin            = udf_write_begin,
146         .write_end              = generic_write_end,
147         .bmap           = udf_bmap,
148 };
149
150 void udf_expand_file_adinicb(struct inode *inode, int newsize, int *err)
151 {
152         struct page *page;
153         char *kaddr;
154         struct udf_inode_info *iinfo = UDF_I(inode);
155         struct writeback_control udf_wbc = {
156                 .sync_mode = WB_SYNC_NONE,
157                 .nr_to_write = 1,
158         };
159
160         /* from now on we have normal address_space methods */
161         inode->i_data.a_ops = &udf_aops;
162
163         if (!iinfo->i_lenAlloc) {
164                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
165                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
166                 else
167                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
168                 mark_inode_dirty(inode);
169                 return;
170         }
171
172         page = grab_cache_page(inode->i_mapping, 0);
173         BUG_ON(!PageLocked(page));
174
175         if (!PageUptodate(page)) {
176                 kaddr = kmap(page);
177                 memset(kaddr + iinfo->i_lenAlloc, 0x00,
178                        PAGE_CACHE_SIZE - iinfo->i_lenAlloc);
179                 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
180                         iinfo->i_lenAlloc);
181                 flush_dcache_page(page);
182                 SetPageUptodate(page);
183                 kunmap(page);
184         }
185         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
186                iinfo->i_lenAlloc);
187         iinfo->i_lenAlloc = 0;
188         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
189                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
190         else
191                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
192
193         inode->i_data.a_ops->writepage(page, &udf_wbc);
194         page_cache_release(page);
195
196         mark_inode_dirty(inode);
197 }
198
199 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
200                                            int *err)
201 {
202         int newblock;
203         struct buffer_head *dbh = NULL;
204         struct kernel_lb_addr eloc;
205         uint8_t alloctype;
206         struct extent_position epos;
207
208         struct udf_fileident_bh sfibh, dfibh;
209         loff_t f_pos = udf_ext0_offset(inode);
210         int size = udf_ext0_offset(inode) + inode->i_size;
211         struct fileIdentDesc cfi, *sfi, *dfi;
212         struct udf_inode_info *iinfo = UDF_I(inode);
213
214         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
215                 alloctype = ICBTAG_FLAG_AD_SHORT;
216         else
217                 alloctype = ICBTAG_FLAG_AD_LONG;
218
219         if (!inode->i_size) {
220                 iinfo->i_alloc_type = alloctype;
221                 mark_inode_dirty(inode);
222                 return NULL;
223         }
224
225         /* alloc block, and copy data to it */
226         *block = udf_new_block(inode->i_sb, inode,
227                                iinfo->i_location.partitionReferenceNum,
228                                iinfo->i_location.logicalBlockNum, err);
229         if (!(*block))
230                 return NULL;
231         newblock = udf_get_pblock(inode->i_sb, *block,
232                                   iinfo->i_location.partitionReferenceNum,
233                                 0);
234         if (!newblock)
235                 return NULL;
236         dbh = udf_tgetblk(inode->i_sb, newblock);
237         if (!dbh)
238                 return NULL;
239         lock_buffer(dbh);
240         memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
241         set_buffer_uptodate(dbh);
242         unlock_buffer(dbh);
243         mark_buffer_dirty_inode(dbh, inode);
244
245         sfibh.soffset = sfibh.eoffset =
246                         f_pos & (inode->i_sb->s_blocksize - 1);
247         sfibh.sbh = sfibh.ebh = NULL;
248         dfibh.soffset = dfibh.eoffset = 0;
249         dfibh.sbh = dfibh.ebh = dbh;
250         while (f_pos < size) {
251                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
252                 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
253                                          NULL, NULL, NULL);
254                 if (!sfi) {
255                         brelse(dbh);
256                         return NULL;
257                 }
258                 iinfo->i_alloc_type = alloctype;
259                 sfi->descTag.tagLocation = cpu_to_le32(*block);
260                 dfibh.soffset = dfibh.eoffset;
261                 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
262                 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
263                 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
264                                  sfi->fileIdent +
265                                         le16_to_cpu(sfi->lengthOfImpUse))) {
266                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
267                         brelse(dbh);
268                         return NULL;
269                 }
270         }
271         mark_buffer_dirty_inode(dbh, inode);
272
273         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
274                 iinfo->i_lenAlloc);
275         iinfo->i_lenAlloc = 0;
276         eloc.logicalBlockNum = *block;
277         eloc.partitionReferenceNum =
278                                 iinfo->i_location.partitionReferenceNum;
279         iinfo->i_lenExtents = inode->i_size;
280         epos.bh = NULL;
281         epos.block = iinfo->i_location;
282         epos.offset = udf_file_entry_alloc_offset(inode);
283         udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
284         /* UniqueID stuff */
285
286         brelse(epos.bh);
287         mark_inode_dirty(inode);
288         return dbh;
289 }
290
291 static int udf_get_block(struct inode *inode, sector_t block,
292                          struct buffer_head *bh_result, int create)
293 {
294         int err, new;
295         struct buffer_head *bh;
296         sector_t phys = 0;
297         struct udf_inode_info *iinfo;
298
299         if (!create) {
300                 phys = udf_block_map(inode, block);
301                 if (phys)
302                         map_bh(bh_result, inode->i_sb, phys);
303                 return 0;
304         }
305
306         err = -EIO;
307         new = 0;
308         bh = NULL;
309
310         lock_kernel();
311
312         iinfo = UDF_I(inode);
313         if (block == iinfo->i_next_alloc_block + 1) {
314                 iinfo->i_next_alloc_block++;
315                 iinfo->i_next_alloc_goal++;
316         }
317
318         err = 0;
319
320         bh = inode_getblk(inode, block, &err, &phys, &new);
321         BUG_ON(bh);
322         if (err)
323                 goto abort;
324         BUG_ON(!phys);
325
326         if (new)
327                 set_buffer_new(bh_result);
328         map_bh(bh_result, inode->i_sb, phys);
329
330 abort:
331         unlock_kernel();
332         return err;
333 }
334
335 static struct buffer_head *udf_getblk(struct inode *inode, long block,
336                                       int create, int *err)
337 {
338         struct buffer_head *bh;
339         struct buffer_head dummy;
340
341         dummy.b_state = 0;
342         dummy.b_blocknr = -1000;
343         *err = udf_get_block(inode, block, &dummy, create);
344         if (!*err && buffer_mapped(&dummy)) {
345                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
346                 if (buffer_new(&dummy)) {
347                         lock_buffer(bh);
348                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
349                         set_buffer_uptodate(bh);
350                         unlock_buffer(bh);
351                         mark_buffer_dirty_inode(bh, inode);
352                 }
353                 return bh;
354         }
355
356         return NULL;
357 }
358
359 /* Extend the file by 'blocks' blocks, return the number of extents added */
360 int udf_extend_file(struct inode *inode, struct extent_position *last_pos,
361                     struct kernel_long_ad *last_ext, sector_t blocks)
362 {
363         sector_t add;
364         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
365         struct super_block *sb = inode->i_sb;
366         struct kernel_lb_addr prealloc_loc = {};
367         int prealloc_len = 0;
368         struct udf_inode_info *iinfo;
369
370         /* The previous extent is fake and we should not extend by anything
371          * - there's nothing to do... */
372         if (!blocks && fake)
373                 return 0;
374
375         iinfo = UDF_I(inode);
376         /* Round the last extent up to a multiple of block size */
377         if (last_ext->extLength & (sb->s_blocksize - 1)) {
378                 last_ext->extLength =
379                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
380                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
381                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
382                 iinfo->i_lenExtents =
383                         (iinfo->i_lenExtents + sb->s_blocksize - 1) &
384                         ~(sb->s_blocksize - 1);
385         }
386
387         /* Last extent are just preallocated blocks? */
388         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
389                                                 EXT_NOT_RECORDED_ALLOCATED) {
390                 /* Save the extent so that we can reattach it to the end */
391                 prealloc_loc = last_ext->extLocation;
392                 prealloc_len = last_ext->extLength;
393                 /* Mark the extent as a hole */
394                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
395                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
396                 last_ext->extLocation.logicalBlockNum = 0;
397                 last_ext->extLocation.partitionReferenceNum = 0;
398         }
399
400         /* Can we merge with the previous extent? */
401         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
402                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
403                 add = ((1 << 30) - sb->s_blocksize -
404                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
405                         sb->s_blocksize_bits;
406                 if (add > blocks)
407                         add = blocks;
408                 blocks -= add;
409                 last_ext->extLength += add << sb->s_blocksize_bits;
410         }
411
412         if (fake) {
413                 udf_add_aext(inode, last_pos, &last_ext->extLocation,
414                              last_ext->extLength, 1);
415                 count++;
416         } else
417                 udf_write_aext(inode, last_pos, &last_ext->extLocation,
418                                 last_ext->extLength, 1);
419
420         /* Managed to do everything necessary? */
421         if (!blocks)
422                 goto out;
423
424         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
425         last_ext->extLocation.logicalBlockNum = 0;
426         last_ext->extLocation.partitionReferenceNum = 0;
427         add = (1 << (30-sb->s_blocksize_bits)) - 1;
428         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
429                                 (add << sb->s_blocksize_bits);
430
431         /* Create enough extents to cover the whole hole */
432         while (blocks > add) {
433                 blocks -= add;
434                 if (udf_add_aext(inode, last_pos, &last_ext->extLocation,
435                                  last_ext->extLength, 1) == -1)
436                         return -1;
437                 count++;
438         }
439         if (blocks) {
440                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
441                         (blocks << sb->s_blocksize_bits);
442                 if (udf_add_aext(inode, last_pos, &last_ext->extLocation,
443                                  last_ext->extLength, 1) == -1)
444                         return -1;
445                 count++;
446         }
447
448 out:
449         /* Do we have some preallocated blocks saved? */
450         if (prealloc_len) {
451                 if (udf_add_aext(inode, last_pos, &prealloc_loc,
452                                  prealloc_len, 1) == -1)
453                         return -1;
454                 last_ext->extLocation = prealloc_loc;
455                 last_ext->extLength = prealloc_len;
456                 count++;
457         }
458
459         /* last_pos should point to the last written extent... */
460         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
461                 last_pos->offset -= sizeof(struct short_ad);
462         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
463                 last_pos->offset -= sizeof(struct long_ad);
464         else
465                 return -1;
466
467         return count;
468 }
469
470 static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
471                                         int *err, sector_t *phys, int *new)
472 {
473         static sector_t last_block;
474         struct buffer_head *result = NULL;
475         struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
476         struct extent_position prev_epos, cur_epos, next_epos;
477         int count = 0, startnum = 0, endnum = 0;
478         uint32_t elen = 0, tmpelen;
479         struct kernel_lb_addr eloc, tmpeloc;
480         int c = 1;
481         loff_t lbcount = 0, b_off = 0;
482         uint32_t newblocknum, newblock;
483         sector_t offset = 0;
484         int8_t etype;
485         struct udf_inode_info *iinfo = UDF_I(inode);
486         int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
487         int lastblock = 0;
488
489         prev_epos.offset = udf_file_entry_alloc_offset(inode);
490         prev_epos.block = iinfo->i_location;
491         prev_epos.bh = NULL;
492         cur_epos = next_epos = prev_epos;
493         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
494
495         /* find the extent which contains the block we are looking for.
496            alternate between laarr[0] and laarr[1] for locations of the
497            current extent, and the previous extent */
498         do {
499                 if (prev_epos.bh != cur_epos.bh) {
500                         brelse(prev_epos.bh);
501                         get_bh(cur_epos.bh);
502                         prev_epos.bh = cur_epos.bh;
503                 }
504                 if (cur_epos.bh != next_epos.bh) {
505                         brelse(cur_epos.bh);
506                         get_bh(next_epos.bh);
507                         cur_epos.bh = next_epos.bh;
508                 }
509
510                 lbcount += elen;
511
512                 prev_epos.block = cur_epos.block;
513                 cur_epos.block = next_epos.block;
514
515                 prev_epos.offset = cur_epos.offset;
516                 cur_epos.offset = next_epos.offset;
517
518                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
519                 if (etype == -1)
520                         break;
521
522                 c = !c;
523
524                 laarr[c].extLength = (etype << 30) | elen;
525                 laarr[c].extLocation = eloc;
526
527                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
528                         pgoal = eloc.logicalBlockNum +
529                                 ((elen + inode->i_sb->s_blocksize - 1) >>
530                                  inode->i_sb->s_blocksize_bits);
531
532                 count++;
533         } while (lbcount + elen <= b_off);
534
535         b_off -= lbcount;
536         offset = b_off >> inode->i_sb->s_blocksize_bits;
537         /*
538          * Move prev_epos and cur_epos into indirect extent if we are at
539          * the pointer to it
540          */
541         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
542         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
543
544         /* if the extent is allocated and recorded, return the block
545            if the extent is not a multiple of the blocksize, round up */
546
547         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
548                 if (elen & (inode->i_sb->s_blocksize - 1)) {
549                         elen = EXT_RECORDED_ALLOCATED |
550                                 ((elen + inode->i_sb->s_blocksize - 1) &
551                                  ~(inode->i_sb->s_blocksize - 1));
552                         etype = udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
553                 }
554                 brelse(prev_epos.bh);
555                 brelse(cur_epos.bh);
556                 brelse(next_epos.bh);
557                 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
558                 *phys = newblock;
559                 return NULL;
560         }
561
562         last_block = block;
563         /* Are we beyond EOF? */
564         if (etype == -1) {
565                 int ret;
566
567                 if (count) {
568                         if (c)
569                                 laarr[0] = laarr[1];
570                         startnum = 1;
571                 } else {
572                         /* Create a fake extent when there's not one */
573                         memset(&laarr[0].extLocation, 0x00,
574                                 sizeof(struct kernel_lb_addr));
575                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
576                         /* Will udf_extend_file() create real extent from
577                            a fake one? */
578                         startnum = (offset > 0);
579                 }
580                 /* Create extents for the hole between EOF and offset */
581                 ret = udf_extend_file(inode, &prev_epos, laarr, offset);
582                 if (ret == -1) {
583                         brelse(prev_epos.bh);
584                         brelse(cur_epos.bh);
585                         brelse(next_epos.bh);
586                         /* We don't really know the error here so we just make
587                          * something up */
588                         *err = -ENOSPC;
589                         return NULL;
590                 }
591                 c = 0;
592                 offset = 0;
593                 count += ret;
594                 /* We are not covered by a preallocated extent? */
595                 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
596                                                 EXT_NOT_RECORDED_ALLOCATED) {
597                         /* Is there any real extent? - otherwise we overwrite
598                          * the fake one... */
599                         if (count)
600                                 c = !c;
601                         laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
602                                 inode->i_sb->s_blocksize;
603                         memset(&laarr[c].extLocation, 0x00,
604                                 sizeof(struct kernel_lb_addr));
605                         count++;
606                         endnum++;
607                 }
608                 endnum = c + 1;
609                 lastblock = 1;
610         } else {
611                 endnum = startnum = ((count > 2) ? 2 : count);
612
613                 /* if the current extent is in position 0,
614                    swap it with the previous */
615                 if (!c && count != 1) {
616                         laarr[2] = laarr[0];
617                         laarr[0] = laarr[1];
618                         laarr[1] = laarr[2];
619                         c = 1;
620                 }
621
622                 /* if the current block is located in an extent,
623                    read the next extent */
624                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
625                 if (etype != -1) {
626                         laarr[c + 1].extLength = (etype << 30) | elen;
627                         laarr[c + 1].extLocation = eloc;
628                         count++;
629                         startnum++;
630                         endnum++;
631                 } else
632                         lastblock = 1;
633         }
634
635         /* if the current extent is not recorded but allocated, get the
636          * block in the extent corresponding to the requested block */
637         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
638                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
639         else { /* otherwise, allocate a new block */
640                 if (iinfo->i_next_alloc_block == block)
641                         goal = iinfo->i_next_alloc_goal;
642
643                 if (!goal) {
644                         if (!(goal = pgoal)) /* XXX: what was intended here? */
645                                 goal = iinfo->i_location.logicalBlockNum + 1;
646                 }
647
648                 newblocknum = udf_new_block(inode->i_sb, inode,
649                                 iinfo->i_location.partitionReferenceNum,
650                                 goal, err);
651                 if (!newblocknum) {
652                         brelse(prev_epos.bh);
653                         *err = -ENOSPC;
654                         return NULL;
655                 }
656                 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
657         }
658
659         /* if the extent the requsted block is located in contains multiple
660          * blocks, split the extent into at most three extents. blocks prior
661          * to requested block, requested block, and blocks after requested
662          * block */
663         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
664
665 #ifdef UDF_PREALLOCATE
666         /* We preallocate blocks only for regular files. It also makes sense
667          * for directories but there's a problem when to drop the
668          * preallocation. We might use some delayed work for that but I feel
669          * it's overengineering for a filesystem like UDF. */
670         if (S_ISREG(inode->i_mode))
671                 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
672 #endif
673
674         /* merge any continuous blocks in laarr */
675         udf_merge_extents(inode, laarr, &endnum);
676
677         /* write back the new extents, inserting new extents if the new number
678          * of extents is greater than the old number, and deleting extents if
679          * the new number of extents is less than the old number */
680         udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
681
682         brelse(prev_epos.bh);
683
684         newblock = udf_get_pblock(inode->i_sb, newblocknum,
685                                 iinfo->i_location.partitionReferenceNum, 0);
686         if (!newblock)
687                 return NULL;
688         *phys = newblock;
689         *err = 0;
690         *new = 1;
691         iinfo->i_next_alloc_block = block;
692         iinfo->i_next_alloc_goal = newblocknum;
693         inode->i_ctime = current_fs_time(inode->i_sb);
694
695         if (IS_SYNC(inode))
696                 udf_sync_inode(inode);
697         else
698                 mark_inode_dirty(inode);
699
700         return result;
701 }
702
703 static void udf_split_extents(struct inode *inode, int *c, int offset,
704                               int newblocknum,
705                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
706                               int *endnum)
707 {
708         unsigned long blocksize = inode->i_sb->s_blocksize;
709         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
710
711         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
712             (laarr[*c].extLength >> 30) ==
713                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
714                 int curr = *c;
715                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
716                             blocksize - 1) >> blocksize_bits;
717                 int8_t etype = (laarr[curr].extLength >> 30);
718
719                 if (blen == 1)
720                         ;
721                 else if (!offset || blen == offset + 1) {
722                         laarr[curr + 2] = laarr[curr + 1];
723                         laarr[curr + 1] = laarr[curr];
724                 } else {
725                         laarr[curr + 3] = laarr[curr + 1];
726                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
727                 }
728
729                 if (offset) {
730                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
731                                 udf_free_blocks(inode->i_sb, inode,
732                                                 &laarr[curr].extLocation,
733                                                 0, offset);
734                                 laarr[curr].extLength =
735                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
736                                         (offset << blocksize_bits);
737                                 laarr[curr].extLocation.logicalBlockNum = 0;
738                                 laarr[curr].extLocation.
739                                                 partitionReferenceNum = 0;
740                         } else
741                                 laarr[curr].extLength = (etype << 30) |
742                                         (offset << blocksize_bits);
743                         curr++;
744                         (*c)++;
745                         (*endnum)++;
746                 }
747
748                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
749                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
750                         laarr[curr].extLocation.partitionReferenceNum =
751                                 UDF_I(inode)->i_location.partitionReferenceNum;
752                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
753                         blocksize;
754                 curr++;
755
756                 if (blen != offset + 1) {
757                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
758                                 laarr[curr].extLocation.logicalBlockNum +=
759                                                                 offset + 1;
760                         laarr[curr].extLength = (etype << 30) |
761                                 ((blen - (offset + 1)) << blocksize_bits);
762                         curr++;
763                         (*endnum)++;
764                 }
765         }
766 }
767
768 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
769                                  struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
770                                  int *endnum)
771 {
772         int start, length = 0, currlength = 0, i;
773
774         if (*endnum >= (c + 1)) {
775                 if (!lastblock)
776                         return;
777                 else
778                         start = c;
779         } else {
780                 if ((laarr[c + 1].extLength >> 30) ==
781                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
782                         start = c + 1;
783                         length = currlength =
784                                 (((laarr[c + 1].extLength &
785                                         UDF_EXTENT_LENGTH_MASK) +
786                                 inode->i_sb->s_blocksize - 1) >>
787                                 inode->i_sb->s_blocksize_bits);
788                 } else
789                         start = c;
790         }
791
792         for (i = start + 1; i <= *endnum; i++) {
793                 if (i == *endnum) {
794                         if (lastblock)
795                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
796                 } else if ((laarr[i].extLength >> 30) ==
797                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
798                         length += (((laarr[i].extLength &
799                                                 UDF_EXTENT_LENGTH_MASK) +
800                                     inode->i_sb->s_blocksize - 1) >>
801                                     inode->i_sb->s_blocksize_bits);
802                 } else
803                         break;
804         }
805
806         if (length) {
807                 int next = laarr[start].extLocation.logicalBlockNum +
808                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
809                           inode->i_sb->s_blocksize - 1) >>
810                           inode->i_sb->s_blocksize_bits);
811                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
812                                 laarr[start].extLocation.partitionReferenceNum,
813                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
814                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
815                                 currlength);
816                 if (numalloc)   {
817                         if (start == (c + 1))
818                                 laarr[start].extLength +=
819                                         (numalloc <<
820                                          inode->i_sb->s_blocksize_bits);
821                         else {
822                                 memmove(&laarr[c + 2], &laarr[c + 1],
823                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
824                                 (*endnum)++;
825                                 laarr[c + 1].extLocation.logicalBlockNum = next;
826                                 laarr[c + 1].extLocation.partitionReferenceNum =
827                                         laarr[c].extLocation.
828                                                         partitionReferenceNum;
829                                 laarr[c + 1].extLength =
830                                         EXT_NOT_RECORDED_ALLOCATED |
831                                         (numalloc <<
832                                          inode->i_sb->s_blocksize_bits);
833                                 start = c + 1;
834                         }
835
836                         for (i = start + 1; numalloc && i < *endnum; i++) {
837                                 int elen = ((laarr[i].extLength &
838                                                 UDF_EXTENT_LENGTH_MASK) +
839                                             inode->i_sb->s_blocksize - 1) >>
840                                             inode->i_sb->s_blocksize_bits;
841
842                                 if (elen > numalloc) {
843                                         laarr[i].extLength -=
844                                                 (numalloc <<
845                                                  inode->i_sb->s_blocksize_bits);
846                                         numalloc = 0;
847                                 } else {
848                                         numalloc -= elen;
849                                         if (*endnum > (i + 1))
850                                                 memmove(&laarr[i],
851                                                         &laarr[i + 1],
852                                                         sizeof(struct long_ad) *
853                                                         (*endnum - (i + 1)));
854                                         i--;
855                                         (*endnum)--;
856                                 }
857                         }
858                         UDF_I(inode)->i_lenExtents +=
859                                 numalloc << inode->i_sb->s_blocksize_bits;
860                 }
861         }
862 }
863
864 static void udf_merge_extents(struct inode *inode,
865                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
866                               int *endnum)
867 {
868         int i;
869         unsigned long blocksize = inode->i_sb->s_blocksize;
870         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
871
872         for (i = 0; i < (*endnum - 1); i++) {
873                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
874                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
875
876                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
877                         (((li->extLength >> 30) ==
878                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
879                         ((lip1->extLocation.logicalBlockNum -
880                           li->extLocation.logicalBlockNum) ==
881                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
882                         blocksize - 1) >> blocksize_bits)))) {
883
884                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
885                                 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
886                                 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
887                                 lip1->extLength = (lip1->extLength -
888                                                   (li->extLength &
889                                                    UDF_EXTENT_LENGTH_MASK) +
890                                                    UDF_EXTENT_LENGTH_MASK) &
891                                                         ~(blocksize - 1);
892                                 li->extLength = (li->extLength &
893                                                  UDF_EXTENT_FLAG_MASK) +
894                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
895                                                 blocksize;
896                                 lip1->extLocation.logicalBlockNum =
897                                         li->extLocation.logicalBlockNum +
898                                         ((li->extLength &
899                                                 UDF_EXTENT_LENGTH_MASK) >>
900                                                 blocksize_bits);
901                         } else {
902                                 li->extLength = lip1->extLength +
903                                         (((li->extLength &
904                                                 UDF_EXTENT_LENGTH_MASK) +
905                                          blocksize - 1) & ~(blocksize - 1));
906                                 if (*endnum > (i + 2))
907                                         memmove(&laarr[i + 1], &laarr[i + 2],
908                                                 sizeof(struct long_ad) *
909                                                 (*endnum - (i + 2)));
910                                 i--;
911                                 (*endnum)--;
912                         }
913                 } else if (((li->extLength >> 30) ==
914                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
915                            ((lip1->extLength >> 30) ==
916                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
917                         udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
918                                         ((li->extLength &
919                                           UDF_EXTENT_LENGTH_MASK) +
920                                          blocksize - 1) >> blocksize_bits);
921                         li->extLocation.logicalBlockNum = 0;
922                         li->extLocation.partitionReferenceNum = 0;
923
924                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
925                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
926                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
927                                 lip1->extLength = (lip1->extLength -
928                                                    (li->extLength &
929                                                    UDF_EXTENT_LENGTH_MASK) +
930                                                    UDF_EXTENT_LENGTH_MASK) &
931                                                    ~(blocksize - 1);
932                                 li->extLength = (li->extLength &
933                                                  UDF_EXTENT_FLAG_MASK) +
934                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
935                                                 blocksize;
936                         } else {
937                                 li->extLength = lip1->extLength +
938                                         (((li->extLength &
939                                                 UDF_EXTENT_LENGTH_MASK) +
940                                           blocksize - 1) & ~(blocksize - 1));
941                                 if (*endnum > (i + 2))
942                                         memmove(&laarr[i + 1], &laarr[i + 2],
943                                                 sizeof(struct long_ad) *
944                                                 (*endnum - (i + 2)));
945                                 i--;
946                                 (*endnum)--;
947                         }
948                 } else if ((li->extLength >> 30) ==
949                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
950                         udf_free_blocks(inode->i_sb, inode,
951                                         &li->extLocation, 0,
952                                         ((li->extLength &
953                                                 UDF_EXTENT_LENGTH_MASK) +
954                                          blocksize - 1) >> blocksize_bits);
955                         li->extLocation.logicalBlockNum = 0;
956                         li->extLocation.partitionReferenceNum = 0;
957                         li->extLength = (li->extLength &
958                                                 UDF_EXTENT_LENGTH_MASK) |
959                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
960                 }
961         }
962 }
963
964 static void udf_update_extents(struct inode *inode,
965                                struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
966                                int startnum, int endnum,
967                                struct extent_position *epos)
968 {
969         int start = 0, i;
970         struct kernel_lb_addr tmploc;
971         uint32_t tmplen;
972
973         if (startnum > endnum) {
974                 for (i = 0; i < (startnum - endnum); i++)
975                         udf_delete_aext(inode, *epos, laarr[i].extLocation,
976                                         laarr[i].extLength);
977         } else if (startnum < endnum) {
978                 for (i = 0; i < (endnum - startnum); i++) {
979                         udf_insert_aext(inode, *epos, laarr[i].extLocation,
980                                         laarr[i].extLength);
981                         udf_next_aext(inode, epos, &laarr[i].extLocation,
982                                       &laarr[i].extLength, 1);
983                         start++;
984                 }
985         }
986
987         for (i = start; i < endnum; i++) {
988                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
989                 udf_write_aext(inode, epos, &laarr[i].extLocation,
990                                laarr[i].extLength, 1);
991         }
992 }
993
994 struct buffer_head *udf_bread(struct inode *inode, int block,
995                               int create, int *err)
996 {
997         struct buffer_head *bh = NULL;
998
999         bh = udf_getblk(inode, block, create, err);
1000         if (!bh)
1001                 return NULL;
1002
1003         if (buffer_uptodate(bh))
1004                 return bh;
1005
1006         ll_rw_block(READ, 1, &bh);
1007
1008         wait_on_buffer(bh);
1009         if (buffer_uptodate(bh))
1010                 return bh;
1011
1012         brelse(bh);
1013         *err = -EIO;
1014         return NULL;
1015 }
1016
1017 void udf_truncate(struct inode *inode)
1018 {
1019         int offset;
1020         int err;
1021         struct udf_inode_info *iinfo;
1022
1023         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1024               S_ISLNK(inode->i_mode)))
1025                 return;
1026         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1027                 return;
1028
1029         lock_kernel();
1030         iinfo = UDF_I(inode);
1031         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1032                 if (inode->i_sb->s_blocksize <
1033                                 (udf_file_entry_alloc_offset(inode) +
1034                                  inode->i_size)) {
1035                         udf_expand_file_adinicb(inode, inode->i_size, &err);
1036                         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1037                                 inode->i_size = iinfo->i_lenAlloc;
1038                                 unlock_kernel();
1039                                 return;
1040                         } else
1041                                 udf_truncate_extents(inode);
1042                 } else {
1043                         offset = inode->i_size & (inode->i_sb->s_blocksize - 1);
1044                         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
1045                                 0x00, inode->i_sb->s_blocksize -
1046                                 offset - udf_file_entry_alloc_offset(inode));
1047                         iinfo->i_lenAlloc = inode->i_size;
1048                 }
1049         } else {
1050                 block_truncate_page(inode->i_mapping, inode->i_size,
1051                                     udf_get_block);
1052                 udf_truncate_extents(inode);
1053         }
1054
1055         inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1056         if (IS_SYNC(inode))
1057                 udf_sync_inode(inode);
1058         else
1059                 mark_inode_dirty(inode);
1060         unlock_kernel();
1061 }
1062
1063 static void __udf_read_inode(struct inode *inode)
1064 {
1065         struct buffer_head *bh = NULL;
1066         struct fileEntry *fe;
1067         uint16_t ident;
1068         struct udf_inode_info *iinfo = UDF_I(inode);
1069
1070         /*
1071          * Set defaults, but the inode is still incomplete!
1072          * Note: get_new_inode() sets the following on a new inode:
1073          *      i_sb = sb
1074          *      i_no = ino
1075          *      i_flags = sb->s_flags
1076          *      i_state = 0
1077          * clean_inode(): zero fills and sets
1078          *      i_count = 1
1079          *      i_nlink = 1
1080          *      i_op = NULL;
1081          */
1082         bh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 0, &ident);
1083         if (!bh) {
1084                 printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed !bh\n",
1085                        inode->i_ino);
1086                 make_bad_inode(inode);
1087                 return;
1088         }
1089
1090         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1091             ident != TAG_IDENT_USE) {
1092                 printk(KERN_ERR "udf: udf_read_inode(ino %ld) "
1093                                 "failed ident=%d\n", inode->i_ino, ident);
1094                 brelse(bh);
1095                 make_bad_inode(inode);
1096                 return;
1097         }
1098
1099         fe = (struct fileEntry *)bh->b_data;
1100
1101         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1102                 struct buffer_head *ibh;
1103
1104                 ibh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 1,
1105                                         &ident);
1106                 if (ident == TAG_IDENT_IE && ibh) {
1107                         struct buffer_head *nbh = NULL;
1108                         struct kernel_lb_addr loc;
1109                         struct indirectEntry *ie;
1110
1111                         ie = (struct indirectEntry *)ibh->b_data;
1112                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1113
1114                         if (ie->indirectICB.extLength &&
1115                                 (nbh = udf_read_ptagged(inode->i_sb, &loc, 0,
1116                                                         &ident))) {
1117                                 if (ident == TAG_IDENT_FE ||
1118                                         ident == TAG_IDENT_EFE) {
1119                                         memcpy(&iinfo->i_location,
1120                                                 &loc,
1121                                                 sizeof(struct kernel_lb_addr));
1122                                         brelse(bh);
1123                                         brelse(ibh);
1124                                         brelse(nbh);
1125                                         __udf_read_inode(inode);
1126                                         return;
1127                                 }
1128                                 brelse(nbh);
1129                         }
1130                 }
1131                 brelse(ibh);
1132         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1133                 printk(KERN_ERR "udf: unsupported strategy type: %d\n",
1134                        le16_to_cpu(fe->icbTag.strategyType));
1135                 brelse(bh);
1136                 make_bad_inode(inode);
1137                 return;
1138         }
1139         udf_fill_inode(inode, bh);
1140
1141         brelse(bh);
1142 }
1143
1144 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1145 {
1146         struct fileEntry *fe;
1147         struct extendedFileEntry *efe;
1148         int offset;
1149         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1150         struct udf_inode_info *iinfo = UDF_I(inode);
1151
1152         fe = (struct fileEntry *)bh->b_data;
1153         efe = (struct extendedFileEntry *)bh->b_data;
1154
1155         if (fe->icbTag.strategyType == cpu_to_le16(4))
1156                 iinfo->i_strat4096 = 0;
1157         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1158                 iinfo->i_strat4096 = 1;
1159
1160         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1161                                                         ICBTAG_FLAG_AD_MASK;
1162         iinfo->i_unique = 0;
1163         iinfo->i_lenEAttr = 0;
1164         iinfo->i_lenExtents = 0;
1165         iinfo->i_lenAlloc = 0;
1166         iinfo->i_next_alloc_block = 0;
1167         iinfo->i_next_alloc_goal = 0;
1168         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1169                 iinfo->i_efe = 1;
1170                 iinfo->i_use = 0;
1171                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1172                                         sizeof(struct extendedFileEntry))) {
1173                         make_bad_inode(inode);
1174                         return;
1175                 }
1176                 memcpy(iinfo->i_ext.i_data,
1177                        bh->b_data + sizeof(struct extendedFileEntry),
1178                        inode->i_sb->s_blocksize -
1179                                         sizeof(struct extendedFileEntry));
1180         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1181                 iinfo->i_efe = 0;
1182                 iinfo->i_use = 0;
1183                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1184                                                 sizeof(struct fileEntry))) {
1185                         make_bad_inode(inode);
1186                         return;
1187                 }
1188                 memcpy(iinfo->i_ext.i_data,
1189                        bh->b_data + sizeof(struct fileEntry),
1190                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1191         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1192                 iinfo->i_efe = 0;
1193                 iinfo->i_use = 1;
1194                 iinfo->i_lenAlloc = le32_to_cpu(
1195                                 ((struct unallocSpaceEntry *)bh->b_data)->
1196                                  lengthAllocDescs);
1197                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1198                                         sizeof(struct unallocSpaceEntry))) {
1199                         make_bad_inode(inode);
1200                         return;
1201                 }
1202                 memcpy(iinfo->i_ext.i_data,
1203                        bh->b_data + sizeof(struct unallocSpaceEntry),
1204                        inode->i_sb->s_blocksize -
1205                                         sizeof(struct unallocSpaceEntry));
1206                 return;
1207         }
1208
1209         inode->i_uid = le32_to_cpu(fe->uid);
1210         if (inode->i_uid == -1 ||
1211             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1212             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1213                 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1214
1215         inode->i_gid = le32_to_cpu(fe->gid);
1216         if (inode->i_gid == -1 ||
1217             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1218             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1219                 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1220
1221         inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
1222         if (!inode->i_nlink)
1223                 inode->i_nlink = 1;
1224
1225         inode->i_size = le64_to_cpu(fe->informationLength);
1226         iinfo->i_lenExtents = inode->i_size;
1227
1228         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1229                         sbi->s_fmode != UDF_INVALID_MODE)
1230                 inode->i_mode = sbi->s_fmode;
1231         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1232                         sbi->s_dmode != UDF_INVALID_MODE)
1233                 inode->i_mode = sbi->s_dmode;
1234         else
1235                 inode->i_mode = udf_convert_permissions(fe);
1236         inode->i_mode &= ~sbi->s_umask;
1237
1238         if (iinfo->i_efe == 0) {
1239                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1240                         (inode->i_sb->s_blocksize_bits - 9);
1241
1242                 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1243                         inode->i_atime = sbi->s_record_time;
1244
1245                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1246                                             fe->modificationTime))
1247                         inode->i_mtime = sbi->s_record_time;
1248
1249                 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1250                         inode->i_ctime = sbi->s_record_time;
1251
1252                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1253                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1254                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1255                 offset = sizeof(struct fileEntry) + iinfo->i_lenEAttr;
1256         } else {
1257                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1258                     (inode->i_sb->s_blocksize_bits - 9);
1259
1260                 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1261                         inode->i_atime = sbi->s_record_time;
1262
1263                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1264                                             efe->modificationTime))
1265                         inode->i_mtime = sbi->s_record_time;
1266
1267                 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1268                         iinfo->i_crtime = sbi->s_record_time;
1269
1270                 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1271                         inode->i_ctime = sbi->s_record_time;
1272
1273                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1274                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1275                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1276                 offset = sizeof(struct extendedFileEntry) +
1277                                                         iinfo->i_lenEAttr;
1278         }
1279
1280         switch (fe->icbTag.fileType) {
1281         case ICBTAG_FILE_TYPE_DIRECTORY:
1282                 inode->i_op = &udf_dir_inode_operations;
1283                 inode->i_fop = &udf_dir_operations;
1284                 inode->i_mode |= S_IFDIR;
1285                 inc_nlink(inode);
1286                 break;
1287         case ICBTAG_FILE_TYPE_REALTIME:
1288         case ICBTAG_FILE_TYPE_REGULAR:
1289         case ICBTAG_FILE_TYPE_UNDEF:
1290         case ICBTAG_FILE_TYPE_VAT20:
1291                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1292                         inode->i_data.a_ops = &udf_adinicb_aops;
1293                 else
1294                         inode->i_data.a_ops = &udf_aops;
1295                 inode->i_op = &udf_file_inode_operations;
1296                 inode->i_fop = &udf_file_operations;
1297                 inode->i_mode |= S_IFREG;
1298                 break;
1299         case ICBTAG_FILE_TYPE_BLOCK:
1300                 inode->i_mode |= S_IFBLK;
1301                 break;
1302         case ICBTAG_FILE_TYPE_CHAR:
1303                 inode->i_mode |= S_IFCHR;
1304                 break;
1305         case ICBTAG_FILE_TYPE_FIFO:
1306                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1307                 break;
1308         case ICBTAG_FILE_TYPE_SOCKET:
1309                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1310                 break;
1311         case ICBTAG_FILE_TYPE_SYMLINK:
1312                 inode->i_data.a_ops = &udf_symlink_aops;
1313                 inode->i_op = &page_symlink_inode_operations;
1314                 inode->i_mode = S_IFLNK | S_IRWXUGO;
1315                 break;
1316         case ICBTAG_FILE_TYPE_MAIN:
1317                 udf_debug("METADATA FILE-----\n");
1318                 break;
1319         case ICBTAG_FILE_TYPE_MIRROR:
1320                 udf_debug("METADATA MIRROR FILE-----\n");
1321                 break;
1322         case ICBTAG_FILE_TYPE_BITMAP:
1323                 udf_debug("METADATA BITMAP FILE-----\n");
1324                 break;
1325         default:
1326                 printk(KERN_ERR "udf: udf_fill_inode(ino %ld) failed unknown "
1327                                 "file type=%d\n", inode->i_ino,
1328                                 fe->icbTag.fileType);
1329                 make_bad_inode(inode);
1330                 return;
1331         }
1332         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1333                 struct deviceSpec *dsea =
1334                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1335                 if (dsea) {
1336                         init_special_inode(inode, inode->i_mode,
1337                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1338                                       le32_to_cpu(dsea->minorDeviceIdent)));
1339                         /* Developer ID ??? */
1340                 } else
1341                         make_bad_inode(inode);
1342         }
1343 }
1344
1345 static int udf_alloc_i_data(struct inode *inode, size_t size)
1346 {
1347         struct udf_inode_info *iinfo = UDF_I(inode);
1348         iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1349
1350         if (!iinfo->i_ext.i_data) {
1351                 printk(KERN_ERR "udf:udf_alloc_i_data (ino %ld) "
1352                                 "no free memory\n", inode->i_ino);
1353                 return -ENOMEM;
1354         }
1355
1356         return 0;
1357 }
1358
1359 static mode_t udf_convert_permissions(struct fileEntry *fe)
1360 {
1361         mode_t mode;
1362         uint32_t permissions;
1363         uint32_t flags;
1364
1365         permissions = le32_to_cpu(fe->permissions);
1366         flags = le16_to_cpu(fe->icbTag.flags);
1367
1368         mode =  ((permissions) & S_IRWXO) |
1369                 ((permissions >> 2) & S_IRWXG) |
1370                 ((permissions >> 4) & S_IRWXU) |
1371                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1372                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1373                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1374
1375         return mode;
1376 }
1377
1378 int udf_write_inode(struct inode *inode, int sync)
1379 {
1380         int ret;
1381
1382         lock_kernel();
1383         ret = udf_update_inode(inode, sync);
1384         unlock_kernel();
1385
1386         return ret;
1387 }
1388
1389 int udf_sync_inode(struct inode *inode)
1390 {
1391         return udf_update_inode(inode, 1);
1392 }
1393
1394 static int udf_update_inode(struct inode *inode, int do_sync)
1395 {
1396         struct buffer_head *bh = NULL;
1397         struct fileEntry *fe;
1398         struct extendedFileEntry *efe;
1399         uint32_t udfperms;
1400         uint16_t icbflags;
1401         uint16_t crclen;
1402         int err = 0;
1403         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1404         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1405         struct udf_inode_info *iinfo = UDF_I(inode);
1406
1407         bh = udf_tread(inode->i_sb,
1408                         udf_get_lb_pblock(inode->i_sb,
1409                                           &iinfo->i_location, 0));
1410         if (!bh) {
1411                 udf_debug("bread failure\n");
1412                 return -EIO;
1413         }
1414
1415         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
1416
1417         fe = (struct fileEntry *)bh->b_data;
1418         efe = (struct extendedFileEntry *)bh->b_data;
1419
1420         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1421                 struct unallocSpaceEntry *use =
1422                         (struct unallocSpaceEntry *)bh->b_data;
1423
1424                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1425                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1426                        iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1427                                         sizeof(struct unallocSpaceEntry));
1428                 crclen = sizeof(struct unallocSpaceEntry) +
1429                                 iinfo->i_lenAlloc - sizeof(struct tag);
1430                 use->descTag.tagLocation = cpu_to_le32(
1431                                                 iinfo->i_location.
1432                                                         logicalBlockNum);
1433                 use->descTag.descCRCLength = cpu_to_le16(crclen);
1434                 use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
1435                                                            sizeof(struct tag),
1436                                                            crclen));
1437                 use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1438
1439                 mark_buffer_dirty(bh);
1440                 brelse(bh);
1441                 return err;
1442         }
1443
1444         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1445                 fe->uid = cpu_to_le32(-1);
1446         else
1447                 fe->uid = cpu_to_le32(inode->i_uid);
1448
1449         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1450                 fe->gid = cpu_to_le32(-1);
1451         else
1452                 fe->gid = cpu_to_le32(inode->i_gid);
1453
1454         udfperms = ((inode->i_mode & S_IRWXO)) |
1455                    ((inode->i_mode & S_IRWXG) << 2) |
1456                    ((inode->i_mode & S_IRWXU) << 4);
1457
1458         udfperms |= (le32_to_cpu(fe->permissions) &
1459                     (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1460                      FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1461                      FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1462         fe->permissions = cpu_to_le32(udfperms);
1463
1464         if (S_ISDIR(inode->i_mode))
1465                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1466         else
1467                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1468
1469         fe->informationLength = cpu_to_le64(inode->i_size);
1470
1471         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1472                 struct regid *eid;
1473                 struct deviceSpec *dsea =
1474                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1475                 if (!dsea) {
1476                         dsea = (struct deviceSpec *)
1477                                 udf_add_extendedattr(inode,
1478                                                      sizeof(struct deviceSpec) +
1479                                                      sizeof(struct regid), 12, 0x3);
1480                         dsea->attrType = cpu_to_le32(12);
1481                         dsea->attrSubtype = 1;
1482                         dsea->attrLength = cpu_to_le32(
1483                                                 sizeof(struct deviceSpec) +
1484                                                 sizeof(struct regid));
1485                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1486                 }
1487                 eid = (struct regid *)dsea->impUse;
1488                 memset(eid, 0, sizeof(struct regid));
1489                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1490                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1491                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1492                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1493                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1494         }
1495
1496         if (iinfo->i_efe == 0) {
1497                 memcpy(bh->b_data + sizeof(struct fileEntry),
1498                        iinfo->i_ext.i_data,
1499                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1500                 fe->logicalBlocksRecorded = cpu_to_le64(
1501                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1502                         (blocksize_bits - 9));
1503
1504                 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1505                 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1506                 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1507                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1508                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1509                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1510                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1511                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1512                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1513                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1514                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1515                 crclen = sizeof(struct fileEntry);
1516         } else {
1517                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1518                        iinfo->i_ext.i_data,
1519                        inode->i_sb->s_blocksize -
1520                                         sizeof(struct extendedFileEntry));
1521                 efe->objectSize = cpu_to_le64(inode->i_size);
1522                 efe->logicalBlocksRecorded = cpu_to_le64(
1523                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1524                         (blocksize_bits - 9));
1525
1526                 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1527                     (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1528                      iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1529                         iinfo->i_crtime = inode->i_atime;
1530
1531                 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1532                     (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1533                      iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1534                         iinfo->i_crtime = inode->i_mtime;
1535
1536                 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1537                     (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1538                      iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1539                         iinfo->i_crtime = inode->i_ctime;
1540
1541                 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1542                 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1543                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1544                 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1545
1546                 memset(&(efe->impIdent), 0, sizeof(struct regid));
1547                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1548                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1549                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1550                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1551                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1552                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1553                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1554                 crclen = sizeof(struct extendedFileEntry);
1555         }
1556         if (iinfo->i_strat4096) {
1557                 fe->icbTag.strategyType = cpu_to_le16(4096);
1558                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1559                 fe->icbTag.numEntries = cpu_to_le16(2);
1560         } else {
1561                 fe->icbTag.strategyType = cpu_to_le16(4);
1562                 fe->icbTag.numEntries = cpu_to_le16(1);
1563         }
1564
1565         if (S_ISDIR(inode->i_mode))
1566                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1567         else if (S_ISREG(inode->i_mode))
1568                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1569         else if (S_ISLNK(inode->i_mode))
1570                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1571         else if (S_ISBLK(inode->i_mode))
1572                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1573         else if (S_ISCHR(inode->i_mode))
1574                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1575         else if (S_ISFIFO(inode->i_mode))
1576                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1577         else if (S_ISSOCK(inode->i_mode))
1578                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1579
1580         icbflags =      iinfo->i_alloc_type |
1581                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1582                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1583                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1584                         (le16_to_cpu(fe->icbTag.flags) &
1585                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1586                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1587
1588         fe->icbTag.flags = cpu_to_le16(icbflags);
1589         if (sbi->s_udfrev >= 0x0200)
1590                 fe->descTag.descVersion = cpu_to_le16(3);
1591         else
1592                 fe->descTag.descVersion = cpu_to_le16(2);
1593         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1594         fe->descTag.tagLocation = cpu_to_le32(
1595                                         iinfo->i_location.logicalBlockNum);
1596         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc -
1597                                                                 sizeof(struct tag);
1598         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1599         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1600                                                   crclen));
1601         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1602
1603         /* write the data blocks */
1604         mark_buffer_dirty(bh);
1605         if (do_sync) {
1606                 sync_dirty_buffer(bh);
1607                 if (buffer_req(bh) && !buffer_uptodate(bh)) {
1608                         printk(KERN_WARNING "IO error syncing udf inode "
1609                                 "[%s:%08lx]\n", inode->i_sb->s_id,
1610                                 inode->i_ino);
1611                         err = -EIO;
1612                 }
1613         }
1614         brelse(bh);
1615
1616         return err;
1617 }
1618
1619 struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
1620 {
1621         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1622         struct inode *inode = iget_locked(sb, block);
1623
1624         if (!inode)
1625                 return NULL;
1626
1627         if (inode->i_state & I_NEW) {
1628                 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1629                 __udf_read_inode(inode);
1630                 unlock_new_inode(inode);
1631         }
1632
1633         if (is_bad_inode(inode))
1634                 goto out_iput;
1635
1636         if (ino->logicalBlockNum >= UDF_SB(sb)->
1637                         s_partmaps[ino->partitionReferenceNum].s_partition_len) {
1638                 udf_debug("block=%d, partition=%d out of range\n",
1639                           ino->logicalBlockNum, ino->partitionReferenceNum);
1640                 make_bad_inode(inode);
1641                 goto out_iput;
1642         }
1643
1644         return inode;
1645
1646  out_iput:
1647         iput(inode);
1648         return NULL;
1649 }
1650
1651 int8_t udf_add_aext(struct inode *inode, struct extent_position *epos,
1652                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1653 {
1654         int adsize;
1655         struct short_ad *sad = NULL;
1656         struct long_ad *lad = NULL;
1657         struct allocExtDesc *aed;
1658         int8_t etype;
1659         uint8_t *ptr;
1660         struct udf_inode_info *iinfo = UDF_I(inode);
1661
1662         if (!epos->bh)
1663                 ptr = iinfo->i_ext.i_data + epos->offset -
1664                         udf_file_entry_alloc_offset(inode) +
1665                         iinfo->i_lenEAttr;
1666         else
1667                 ptr = epos->bh->b_data + epos->offset;
1668
1669         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1670                 adsize = sizeof(struct short_ad);
1671         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1672                 adsize = sizeof(struct long_ad);
1673         else
1674                 return -1;
1675
1676         if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1677                 char *sptr, *dptr;
1678                 struct buffer_head *nbh;
1679                 int err, loffset;
1680                 struct kernel_lb_addr obloc = epos->block;
1681
1682                 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1683                                                 obloc.partitionReferenceNum,
1684                                                 obloc.logicalBlockNum, &err);
1685                 if (!epos->block.logicalBlockNum)
1686                         return -1;
1687                 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1688                                                                  &epos->block,
1689                                                                  0));
1690                 if (!nbh)
1691                         return -1;
1692                 lock_buffer(nbh);
1693                 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1694                 set_buffer_uptodate(nbh);
1695                 unlock_buffer(nbh);
1696                 mark_buffer_dirty_inode(nbh, inode);
1697
1698                 aed = (struct allocExtDesc *)(nbh->b_data);
1699                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1700                         aed->previousAllocExtLocation =
1701                                         cpu_to_le32(obloc.logicalBlockNum);
1702                 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1703                         loffset = epos->offset;
1704                         aed->lengthAllocDescs = cpu_to_le32(adsize);
1705                         sptr = ptr - adsize;
1706                         dptr = nbh->b_data + sizeof(struct allocExtDesc);
1707                         memcpy(dptr, sptr, adsize);
1708                         epos->offset = sizeof(struct allocExtDesc) + adsize;
1709                 } else {
1710                         loffset = epos->offset + adsize;
1711                         aed->lengthAllocDescs = cpu_to_le32(0);
1712                         sptr = ptr;
1713                         epos->offset = sizeof(struct allocExtDesc);
1714
1715                         if (epos->bh) {
1716                                 aed = (struct allocExtDesc *)epos->bh->b_data;
1717                                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1718                         } else {
1719                                 iinfo->i_lenAlloc += adsize;
1720                                 mark_inode_dirty(inode);
1721                         }
1722                 }
1723                 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1724                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1725                                     epos->block.logicalBlockNum, sizeof(struct tag));
1726                 else
1727                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1728                                     epos->block.logicalBlockNum, sizeof(struct tag));
1729                 switch (iinfo->i_alloc_type) {
1730                 case ICBTAG_FLAG_AD_SHORT:
1731                         sad = (struct short_ad *)sptr;
1732                         sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1733                                                      inode->i_sb->s_blocksize);
1734                         sad->extPosition =
1735                                 cpu_to_le32(epos->block.logicalBlockNum);
1736                         break;
1737                 case ICBTAG_FLAG_AD_LONG:
1738                         lad = (struct long_ad *)sptr;
1739                         lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1740                                                      inode->i_sb->s_blocksize);
1741                         lad->extLocation = cpu_to_lelb(epos->block);
1742                         memset(lad->impUse, 0x00, sizeof(lad->impUse));
1743                         break;
1744                 }
1745                 if (epos->bh) {
1746                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1747                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1748                                 udf_update_tag(epos->bh->b_data, loffset);
1749                         else
1750                                 udf_update_tag(epos->bh->b_data,
1751                                                 sizeof(struct allocExtDesc));
1752                         mark_buffer_dirty_inode(epos->bh, inode);
1753                         brelse(epos->bh);
1754                 } else {
1755                         mark_inode_dirty(inode);
1756                 }
1757                 epos->bh = nbh;
1758         }
1759
1760         etype = udf_write_aext(inode, epos, eloc, elen, inc);
1761
1762         if (!epos->bh) {
1763                 iinfo->i_lenAlloc += adsize;
1764                 mark_inode_dirty(inode);
1765         } else {
1766                 aed = (struct allocExtDesc *)epos->bh->b_data;
1767                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1768                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1769                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1770                         udf_update_tag(epos->bh->b_data,
1771                                         epos->offset + (inc ? 0 : adsize));
1772                 else
1773                         udf_update_tag(epos->bh->b_data,
1774                                         sizeof(struct allocExtDesc));
1775                 mark_buffer_dirty_inode(epos->bh, inode);
1776         }
1777
1778         return etype;
1779 }
1780
1781 int8_t udf_write_aext(struct inode *inode, struct extent_position *epos,
1782                       struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1783 {
1784         int adsize;
1785         uint8_t *ptr;
1786         struct short_ad *sad;
1787         struct long_ad *lad;
1788         struct udf_inode_info *iinfo = UDF_I(inode);
1789
1790         if (!epos->bh)
1791                 ptr = iinfo->i_ext.i_data + epos->offset -
1792                         udf_file_entry_alloc_offset(inode) +
1793                         iinfo->i_lenEAttr;
1794         else
1795                 ptr = epos->bh->b_data + epos->offset;
1796
1797         switch (iinfo->i_alloc_type) {
1798         case ICBTAG_FLAG_AD_SHORT:
1799                 sad = (struct short_ad *)ptr;
1800                 sad->extLength = cpu_to_le32(elen);
1801                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
1802                 adsize = sizeof(struct short_ad);
1803                 break;
1804         case ICBTAG_FLAG_AD_LONG:
1805                 lad = (struct long_ad *)ptr;
1806                 lad->extLength = cpu_to_le32(elen);
1807                 lad->extLocation = cpu_to_lelb(*eloc);
1808                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1809                 adsize = sizeof(struct long_ad);
1810                 break;
1811         default:
1812                 return -1;
1813         }
1814
1815         if (epos->bh) {
1816                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1817                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
1818                         struct allocExtDesc *aed =
1819                                 (struct allocExtDesc *)epos->bh->b_data;
1820                         udf_update_tag(epos->bh->b_data,
1821                                        le32_to_cpu(aed->lengthAllocDescs) +
1822                                        sizeof(struct allocExtDesc));
1823                 }
1824                 mark_buffer_dirty_inode(epos->bh, inode);
1825         } else {
1826                 mark_inode_dirty(inode);
1827         }
1828
1829         if (inc)
1830                 epos->offset += adsize;
1831
1832         return (elen >> 30);
1833 }
1834
1835 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
1836                      struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1837 {
1838         int8_t etype;
1839
1840         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1841                (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
1842                 int block;
1843                 epos->block = *eloc;
1844                 epos->offset = sizeof(struct allocExtDesc);
1845                 brelse(epos->bh);
1846                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
1847                 epos->bh = udf_tread(inode->i_sb, block);
1848                 if (!epos->bh) {
1849                         udf_debug("reading block %d failed!\n", block);
1850                         return -1;
1851                 }
1852         }
1853
1854         return etype;
1855 }
1856
1857 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
1858                         struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1859 {
1860         int alen;
1861         int8_t etype;
1862         uint8_t *ptr;
1863         struct short_ad *sad;
1864         struct long_ad *lad;
1865         struct udf_inode_info *iinfo = UDF_I(inode);
1866
1867         if (!epos->bh) {
1868                 if (!epos->offset)
1869                         epos->offset = udf_file_entry_alloc_offset(inode);
1870                 ptr = iinfo->i_ext.i_data + epos->offset -
1871                         udf_file_entry_alloc_offset(inode) +
1872                         iinfo->i_lenEAttr;
1873                 alen = udf_file_entry_alloc_offset(inode) +
1874                                                         iinfo->i_lenAlloc;
1875         } else {
1876                 if (!epos->offset)
1877                         epos->offset = sizeof(struct allocExtDesc);
1878                 ptr = epos->bh->b_data + epos->offset;
1879                 alen = sizeof(struct allocExtDesc) +
1880                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
1881                                                         lengthAllocDescs);
1882         }
1883
1884         switch (iinfo->i_alloc_type) {
1885         case ICBTAG_FLAG_AD_SHORT:
1886                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
1887                 if (!sad)
1888                         return -1;
1889                 etype = le32_to_cpu(sad->extLength) >> 30;
1890                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
1891                 eloc->partitionReferenceNum =
1892                                 iinfo->i_location.partitionReferenceNum;
1893                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
1894                 break;
1895         case ICBTAG_FLAG_AD_LONG:
1896                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
1897                 if (!lad)
1898                         return -1;
1899                 etype = le32_to_cpu(lad->extLength) >> 30;
1900                 *eloc = lelb_to_cpu(lad->extLocation);
1901                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
1902                 break;
1903         default:
1904                 udf_debug("alloc_type = %d unsupported\n",
1905                                 iinfo->i_alloc_type);
1906                 return -1;
1907         }
1908
1909         return etype;
1910 }
1911
1912 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
1913                               struct kernel_lb_addr neloc, uint32_t nelen)
1914 {
1915         struct kernel_lb_addr oeloc;
1916         uint32_t oelen;
1917         int8_t etype;
1918
1919         if (epos.bh)
1920                 get_bh(epos.bh);
1921
1922         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
1923                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
1924                 neloc = oeloc;
1925                 nelen = (etype << 30) | oelen;
1926         }
1927         udf_add_aext(inode, &epos, &neloc, nelen, 1);
1928         brelse(epos.bh);
1929
1930         return (nelen >> 30);
1931 }
1932
1933 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
1934                        struct kernel_lb_addr eloc, uint32_t elen)
1935 {
1936         struct extent_position oepos;
1937         int adsize;
1938         int8_t etype;
1939         struct allocExtDesc *aed;
1940         struct udf_inode_info *iinfo;
1941
1942         if (epos.bh) {
1943                 get_bh(epos.bh);
1944                 get_bh(epos.bh);
1945         }
1946
1947         iinfo = UDF_I(inode);
1948         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1949                 adsize = sizeof(struct short_ad);
1950         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1951                 adsize = sizeof(struct long_ad);
1952         else
1953                 adsize = 0;
1954
1955         oepos = epos;
1956         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
1957                 return -1;
1958
1959         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
1960                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
1961                 if (oepos.bh != epos.bh) {
1962                         oepos.block = epos.block;
1963                         brelse(oepos.bh);
1964                         get_bh(epos.bh);
1965                         oepos.bh = epos.bh;
1966                         oepos.offset = epos.offset - adsize;
1967                 }
1968         }
1969         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
1970         elen = 0;
1971
1972         if (epos.bh != oepos.bh) {
1973                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
1974                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
1975                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
1976                 if (!oepos.bh) {
1977                         iinfo->i_lenAlloc -= (adsize * 2);
1978                         mark_inode_dirty(inode);
1979                 } else {
1980                         aed = (struct allocExtDesc *)oepos.bh->b_data;
1981                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
1982                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1983                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1984                                 udf_update_tag(oepos.bh->b_data,
1985                                                 oepos.offset - (2 * adsize));
1986                         else
1987                                 udf_update_tag(oepos.bh->b_data,
1988                                                 sizeof(struct allocExtDesc));
1989                         mark_buffer_dirty_inode(oepos.bh, inode);
1990                 }
1991         } else {
1992                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
1993                 if (!oepos.bh) {
1994                         iinfo->i_lenAlloc -= adsize;
1995                         mark_inode_dirty(inode);
1996                 } else {
1997                         aed = (struct allocExtDesc *)oepos.bh->b_data;
1998                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
1999                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2000                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2001                                 udf_update_tag(oepos.bh->b_data,
2002                                                 epos.offset - adsize);
2003                         else
2004                                 udf_update_tag(oepos.bh->b_data,
2005                                                 sizeof(struct allocExtDesc));
2006                         mark_buffer_dirty_inode(oepos.bh, inode);
2007                 }
2008         }
2009
2010         brelse(epos.bh);
2011         brelse(oepos.bh);
2012
2013         return (elen >> 30);
2014 }
2015
2016 int8_t inode_bmap(struct inode *inode, sector_t block,
2017                   struct extent_position *pos, struct kernel_lb_addr *eloc,
2018                   uint32_t *elen, sector_t *offset)
2019 {
2020         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2021         loff_t lbcount = 0, bcount =
2022             (loff_t) block << blocksize_bits;
2023         int8_t etype;
2024         struct udf_inode_info *iinfo;
2025
2026         iinfo = UDF_I(inode);
2027         pos->offset = 0;
2028         pos->block = iinfo->i_location;
2029         pos->bh = NULL;
2030         *elen = 0;
2031
2032         do {
2033                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2034                 if (etype == -1) {
2035                         *offset = (bcount - lbcount) >> blocksize_bits;
2036                         iinfo->i_lenExtents = lbcount;
2037                         return -1;
2038                 }
2039                 lbcount += *elen;
2040         } while (lbcount <= bcount);
2041
2042         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2043
2044         return etype;
2045 }
2046
2047 long udf_block_map(struct inode *inode, sector_t block)
2048 {
2049         struct kernel_lb_addr eloc;
2050         uint32_t elen;
2051         sector_t offset;
2052         struct extent_position epos = {};
2053         int ret;
2054
2055         lock_kernel();
2056
2057         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2058                                                 (EXT_RECORDED_ALLOCATED >> 30))
2059                 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2060         else
2061                 ret = 0;
2062
2063         unlock_kernel();
2064         brelse(epos.bh);
2065
2066         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2067                 return udf_fixed_to_variable(ret);
2068         else
2069                 return ret;
2070 }