Btrfs: calc file extent num_bytes correctly in file clone
[linux-2.6.git] / fs / ufs / inode.c
1 /*
2  *  linux/fs/ufs/inode.c
3  *
4  * Copyright (C) 1998
5  * Daniel Pirkl <daniel.pirkl@email.cz>
6  * Charles University, Faculty of Mathematics and Physics
7  *
8  *  from
9  *
10  *  linux/fs/ext2/inode.c
11  *
12  * Copyright (C) 1992, 1993, 1994, 1995
13  * Remy Card (card@masi.ibp.fr)
14  * Laboratoire MASI - Institut Blaise Pascal
15  * Universite Pierre et Marie Curie (Paris VI)
16  *
17  *  from
18  *
19  *  linux/fs/minix/inode.c
20  *
21  *  Copyright (C) 1991, 1992  Linus Torvalds
22  *
23  *  Goal-directed block allocation by Stephen Tweedie (sct@dcs.ed.ac.uk), 1993
24  *  Big-endian to little-endian byte-swapping/bitmaps by
25  *        David S. Miller (davem@caip.rutgers.edu), 1995
26  */
27
28 #include <asm/uaccess.h>
29 #include <asm/system.h>
30
31 #include <linux/errno.h>
32 #include <linux/fs.h>
33 #include <linux/time.h>
34 #include <linux/stat.h>
35 #include <linux/string.h>
36 #include <linux/mm.h>
37 #include <linux/buffer_head.h>
38 #include <linux/writeback.h>
39
40 #include "ufs_fs.h"
41 #include "ufs.h"
42 #include "swab.h"
43 #include "util.h"
44
45 static u64 ufs_frag_map(struct inode *inode, sector_t frag, bool needs_lock);
46
47 static int ufs_block_to_path(struct inode *inode, sector_t i_block, sector_t offsets[4])
48 {
49         struct ufs_sb_private_info *uspi = UFS_SB(inode->i_sb)->s_uspi;
50         int ptrs = uspi->s_apb;
51         int ptrs_bits = uspi->s_apbshift;
52         const long direct_blocks = UFS_NDADDR,
53                 indirect_blocks = ptrs,
54                 double_blocks = (1 << (ptrs_bits * 2));
55         int n = 0;
56
57
58         UFSD("ptrs=uspi->s_apb = %d,double_blocks=%ld \n",ptrs,double_blocks);
59         if (i_block < direct_blocks) {
60                 offsets[n++] = i_block;
61         } else if ((i_block -= direct_blocks) < indirect_blocks) {
62                 offsets[n++] = UFS_IND_BLOCK;
63                 offsets[n++] = i_block;
64         } else if ((i_block -= indirect_blocks) < double_blocks) {
65                 offsets[n++] = UFS_DIND_BLOCK;
66                 offsets[n++] = i_block >> ptrs_bits;
67                 offsets[n++] = i_block & (ptrs - 1);
68         } else if (((i_block -= double_blocks) >> (ptrs_bits * 2)) < ptrs) {
69                 offsets[n++] = UFS_TIND_BLOCK;
70                 offsets[n++] = i_block >> (ptrs_bits * 2);
71                 offsets[n++] = (i_block >> ptrs_bits) & (ptrs - 1);
72                 offsets[n++] = i_block & (ptrs - 1);
73         } else {
74                 ufs_warning(inode->i_sb, "ufs_block_to_path", "block > big");
75         }
76         return n;
77 }
78
79 /*
80  * Returns the location of the fragment from
81  * the beginning of the filesystem.
82  */
83
84 static u64 ufs_frag_map(struct inode *inode, sector_t frag, bool needs_lock)
85 {
86         struct ufs_inode_info *ufsi = UFS_I(inode);
87         struct super_block *sb = inode->i_sb;
88         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
89         u64 mask = (u64) uspi->s_apbmask>>uspi->s_fpbshift;
90         int shift = uspi->s_apbshift-uspi->s_fpbshift;
91         sector_t offsets[4], *p;
92         int depth = ufs_block_to_path(inode, frag >> uspi->s_fpbshift, offsets);
93         u64  ret = 0L;
94         __fs32 block;
95         __fs64 u2_block = 0L;
96         unsigned flags = UFS_SB(sb)->s_flags;
97         u64 temp = 0L;
98
99         UFSD(": frag = %llu  depth = %d\n", (unsigned long long)frag, depth);
100         UFSD(": uspi->s_fpbshift = %d ,uspi->s_apbmask = %x, mask=%llx\n",
101                 uspi->s_fpbshift, uspi->s_apbmask,
102                 (unsigned long long)mask);
103
104         if (depth == 0)
105                 return 0;
106
107         p = offsets;
108
109         if (needs_lock)
110                 lock_ufs(sb);
111         if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
112                 goto ufs2;
113
114         block = ufsi->i_u1.i_data[*p++];
115         if (!block)
116                 goto out;
117         while (--depth) {
118                 struct buffer_head *bh;
119                 sector_t n = *p++;
120
121                 bh = sb_bread(sb, uspi->s_sbbase + fs32_to_cpu(sb, block)+(n>>shift));
122                 if (!bh)
123                         goto out;
124                 block = ((__fs32 *) bh->b_data)[n & mask];
125                 brelse (bh);
126                 if (!block)
127                         goto out;
128         }
129         ret = (u64) (uspi->s_sbbase + fs32_to_cpu(sb, block) + (frag & uspi->s_fpbmask));
130         goto out;
131 ufs2:
132         u2_block = ufsi->i_u1.u2_i_data[*p++];
133         if (!u2_block)
134                 goto out;
135
136
137         while (--depth) {
138                 struct buffer_head *bh;
139                 sector_t n = *p++;
140
141
142                 temp = (u64)(uspi->s_sbbase) + fs64_to_cpu(sb, u2_block);
143                 bh = sb_bread(sb, temp +(u64) (n>>shift));
144                 if (!bh)
145                         goto out;
146                 u2_block = ((__fs64 *)bh->b_data)[n & mask];
147                 brelse(bh);
148                 if (!u2_block)
149                         goto out;
150         }
151         temp = (u64)uspi->s_sbbase + fs64_to_cpu(sb, u2_block);
152         ret = temp + (u64) (frag & uspi->s_fpbmask);
153
154 out:
155         if (needs_lock)
156                 unlock_ufs(sb);
157         return ret;
158 }
159
160 /**
161  * ufs_inode_getfrag() - allocate new fragment(s)
162  * @inode - pointer to inode
163  * @fragment - number of `fragment' which hold pointer
164  *   to new allocated fragment(s)
165  * @new_fragment - number of new allocated fragment(s)
166  * @required - how many fragment(s) we require
167  * @err - we set it if something wrong
168  * @phys - pointer to where we save physical number of new allocated fragments,
169  *   NULL if we allocate not data(indirect blocks for example).
170  * @new - we set it if we allocate new block
171  * @locked_page - for ufs_new_fragments()
172  */
173 static struct buffer_head *
174 ufs_inode_getfrag(struct inode *inode, u64 fragment,
175                   sector_t new_fragment, unsigned int required, int *err,
176                   long *phys, int *new, struct page *locked_page)
177 {
178         struct ufs_inode_info *ufsi = UFS_I(inode);
179         struct super_block *sb = inode->i_sb;
180         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
181         struct buffer_head * result;
182         unsigned blockoff, lastblockoff;
183         u64 tmp, goal, lastfrag, block, lastblock;
184         void *p, *p2;
185
186         UFSD("ENTER, ino %lu, fragment %llu, new_fragment %llu, required %u, "
187              "metadata %d\n", inode->i_ino, (unsigned long long)fragment,
188              (unsigned long long)new_fragment, required, !phys);
189
190         /* TODO : to be done for write support
191         if ( (flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
192              goto ufs2;
193          */
194
195         block = ufs_fragstoblks (fragment);
196         blockoff = ufs_fragnum (fragment);
197         p = ufs_get_direct_data_ptr(uspi, ufsi, block);
198
199         goal = 0;
200
201 repeat:
202         tmp = ufs_data_ptr_to_cpu(sb, p);
203
204         lastfrag = ufsi->i_lastfrag;
205         if (tmp && fragment < lastfrag) {
206                 if (!phys) {
207                         result = sb_getblk(sb, uspi->s_sbbase + tmp + blockoff);
208                         if (tmp == ufs_data_ptr_to_cpu(sb, p)) {
209                                 UFSD("EXIT, result %llu\n",
210                                      (unsigned long long)tmp + blockoff);
211                                 return result;
212                         }
213                         brelse (result);
214                         goto repeat;
215                 } else {
216                         *phys = uspi->s_sbbase + tmp + blockoff;
217                         return NULL;
218                 }
219         }
220
221         lastblock = ufs_fragstoblks (lastfrag);
222         lastblockoff = ufs_fragnum (lastfrag);
223         /*
224          * We will extend file into new block beyond last allocated block
225          */
226         if (lastblock < block) {
227                 /*
228                  * We must reallocate last allocated block
229                  */
230                 if (lastblockoff) {
231                         p2 = ufs_get_direct_data_ptr(uspi, ufsi, lastblock);
232                         tmp = ufs_new_fragments(inode, p2, lastfrag,
233                                                 ufs_data_ptr_to_cpu(sb, p2),
234                                                 uspi->s_fpb - lastblockoff,
235                                                 err, locked_page);
236                         if (!tmp) {
237                                 if (lastfrag != ufsi->i_lastfrag)
238                                         goto repeat;
239                                 else
240                                         return NULL;
241                         }
242                         lastfrag = ufsi->i_lastfrag;
243                         
244                 }
245                 tmp = ufs_data_ptr_to_cpu(sb,
246                                          ufs_get_direct_data_ptr(uspi, ufsi,
247                                                                  lastblock));
248                 if (tmp)
249                         goal = tmp + uspi->s_fpb;
250                 tmp = ufs_new_fragments (inode, p, fragment - blockoff, 
251                                          goal, required + blockoff,
252                                          err,
253                                          phys != NULL ? locked_page : NULL);
254         } else if (lastblock == block) {
255         /*
256          * We will extend last allocated block
257          */
258                 tmp = ufs_new_fragments(inode, p, fragment -
259                                         (blockoff - lastblockoff),
260                                         ufs_data_ptr_to_cpu(sb, p),
261                                         required +  (blockoff - lastblockoff),
262                                         err, phys != NULL ? locked_page : NULL);
263         } else /* (lastblock > block) */ {
264         /*
265          * We will allocate new block before last allocated block
266          */
267                 if (block) {
268                         tmp = ufs_data_ptr_to_cpu(sb,
269                                                  ufs_get_direct_data_ptr(uspi, ufsi, block - 1));
270                         if (tmp)
271                                 goal = tmp + uspi->s_fpb;
272                 }
273                 tmp = ufs_new_fragments(inode, p, fragment - blockoff,
274                                         goal, uspi->s_fpb, err,
275                                         phys != NULL ? locked_page : NULL);
276         }
277         if (!tmp) {
278                 if ((!blockoff && ufs_data_ptr_to_cpu(sb, p)) ||
279                     (blockoff && lastfrag != ufsi->i_lastfrag))
280                         goto repeat;
281                 *err = -ENOSPC;
282                 return NULL;
283         }
284
285         if (!phys) {
286                 result = sb_getblk(sb, uspi->s_sbbase + tmp + blockoff);
287         } else {
288                 *phys = uspi->s_sbbase + tmp + blockoff;
289                 result = NULL;
290                 *err = 0;
291                 *new = 1;
292         }
293
294         inode->i_ctime = CURRENT_TIME_SEC;
295         if (IS_SYNC(inode))
296                 ufs_sync_inode (inode);
297         mark_inode_dirty(inode);
298         UFSD("EXIT, result %llu\n", (unsigned long long)tmp + blockoff);
299         return result;
300
301      /* This part : To be implemented ....
302         Required only for writing, not required for READ-ONLY.
303 ufs2:
304
305         u2_block = ufs_fragstoblks(fragment);
306         u2_blockoff = ufs_fragnum(fragment);
307         p = ufsi->i_u1.u2_i_data + block;
308         goal = 0;
309
310 repeat2:
311         tmp = fs32_to_cpu(sb, *p);
312         lastfrag = ufsi->i_lastfrag;
313
314      */
315 }
316
317 /**
318  * ufs_inode_getblock() - allocate new block
319  * @inode - pointer to inode
320  * @bh - pointer to block which hold "pointer" to new allocated block
321  * @fragment - number of `fragment' which hold pointer
322  *   to new allocated block
323  * @new_fragment - number of new allocated fragment
324  *  (block will hold this fragment and also uspi->s_fpb-1)
325  * @err - see ufs_inode_getfrag()
326  * @phys - see ufs_inode_getfrag()
327  * @new - see ufs_inode_getfrag()
328  * @locked_page - see ufs_inode_getfrag()
329  */
330 static struct buffer_head *
331 ufs_inode_getblock(struct inode *inode, struct buffer_head *bh,
332                   u64 fragment, sector_t new_fragment, int *err,
333                   long *phys, int *new, struct page *locked_page)
334 {
335         struct super_block *sb = inode->i_sb;
336         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
337         struct buffer_head * result;
338         unsigned blockoff;
339         u64 tmp, goal, block;
340         void *p;
341
342         block = ufs_fragstoblks (fragment);
343         blockoff = ufs_fragnum (fragment);
344
345         UFSD("ENTER, ino %lu, fragment %llu, new_fragment %llu, metadata %d\n",
346              inode->i_ino, (unsigned long long)fragment,
347              (unsigned long long)new_fragment, !phys);
348
349         result = NULL;
350         if (!bh)
351                 goto out;
352         if (!buffer_uptodate(bh)) {
353                 ll_rw_block (READ, 1, &bh);
354                 wait_on_buffer (bh);
355                 if (!buffer_uptodate(bh))
356                         goto out;
357         }
358         if (uspi->fs_magic == UFS2_MAGIC)
359                 p = (__fs64 *)bh->b_data + block;
360         else
361                 p = (__fs32 *)bh->b_data + block;
362 repeat:
363         tmp = ufs_data_ptr_to_cpu(sb, p);
364         if (tmp) {
365                 if (!phys) {
366                         result = sb_getblk(sb, uspi->s_sbbase + tmp + blockoff);
367                         if (tmp == ufs_data_ptr_to_cpu(sb, p))
368                                 goto out;
369                         brelse (result);
370                         goto repeat;
371                 } else {
372                         *phys = uspi->s_sbbase + tmp + blockoff;
373                         goto out;
374                 }
375         }
376
377         if (block && (uspi->fs_magic == UFS2_MAGIC ?
378                       (tmp = fs64_to_cpu(sb, ((__fs64 *)bh->b_data)[block-1])) :
379                       (tmp = fs32_to_cpu(sb, ((__fs32 *)bh->b_data)[block-1]))))
380                 goal = tmp + uspi->s_fpb;
381         else
382                 goal = bh->b_blocknr + uspi->s_fpb;
383         tmp = ufs_new_fragments(inode, p, ufs_blknum(new_fragment), goal,
384                                 uspi->s_fpb, err, locked_page);
385         if (!tmp) {
386                 if (ufs_data_ptr_to_cpu(sb, p))
387                         goto repeat;
388                 goto out;
389         }               
390
391
392         if (!phys) {
393                 result = sb_getblk(sb, uspi->s_sbbase + tmp + blockoff);
394         } else {
395                 *phys = uspi->s_sbbase + tmp + blockoff;
396                 *new = 1;
397         }
398
399         mark_buffer_dirty(bh);
400         if (IS_SYNC(inode))
401                 sync_dirty_buffer(bh);
402         inode->i_ctime = CURRENT_TIME_SEC;
403         mark_inode_dirty(inode);
404         UFSD("result %llu\n", (unsigned long long)tmp + blockoff);
405 out:
406         brelse (bh);
407         UFSD("EXIT\n");
408         return result;
409 }
410
411 /**
412  * ufs_getfrag_block() - `get_block_t' function, interface between UFS and
413  * readpage, writepage and so on
414  */
415
416 int ufs_getfrag_block(struct inode *inode, sector_t fragment, struct buffer_head *bh_result, int create)
417 {
418         struct super_block * sb = inode->i_sb;
419         struct ufs_sb_info * sbi = UFS_SB(sb);
420         struct ufs_sb_private_info * uspi = sbi->s_uspi;
421         struct buffer_head * bh;
422         int ret, err, new;
423         unsigned long ptr,phys;
424         u64 phys64 = 0;
425         bool needs_lock = (sbi->mutex_owner != current);
426         
427         if (!create) {
428                 phys64 = ufs_frag_map(inode, fragment, needs_lock);
429                 UFSD("phys64 = %llu\n", (unsigned long long)phys64);
430                 if (phys64)
431                         map_bh(bh_result, sb, phys64);
432                 return 0;
433         }
434
435         /* This code entered only while writing ....? */
436
437         err = -EIO;
438         new = 0;
439         ret = 0;
440         bh = NULL;
441
442         if (needs_lock)
443                 lock_ufs(sb);
444
445         UFSD("ENTER, ino %lu, fragment %llu\n", inode->i_ino, (unsigned long long)fragment);
446         if (fragment >
447             ((UFS_NDADDR + uspi->s_apb + uspi->s_2apb + uspi->s_3apb)
448              << uspi->s_fpbshift))
449                 goto abort_too_big;
450
451         err = 0;
452         ptr = fragment;
453           
454         /*
455          * ok, these macros clean the logic up a bit and make
456          * it much more readable:
457          */
458 #define GET_INODE_DATABLOCK(x) \
459         ufs_inode_getfrag(inode, x, fragment, 1, &err, &phys, &new,\
460                           bh_result->b_page)
461 #define GET_INODE_PTR(x) \
462         ufs_inode_getfrag(inode, x, fragment, uspi->s_fpb, &err, NULL, NULL,\
463                           bh_result->b_page)
464 #define GET_INDIRECT_DATABLOCK(x) \
465         ufs_inode_getblock(inode, bh, x, fragment,      \
466                           &err, &phys, &new, bh_result->b_page)
467 #define GET_INDIRECT_PTR(x) \
468         ufs_inode_getblock(inode, bh, x, fragment,      \
469                           &err, NULL, NULL, NULL)
470
471         if (ptr < UFS_NDIR_FRAGMENT) {
472                 bh = GET_INODE_DATABLOCK(ptr);
473                 goto out;
474         }
475         ptr -= UFS_NDIR_FRAGMENT;
476         if (ptr < (1 << (uspi->s_apbshift + uspi->s_fpbshift))) {
477                 bh = GET_INODE_PTR(UFS_IND_FRAGMENT + (ptr >> uspi->s_apbshift));
478                 goto get_indirect;
479         }
480         ptr -= 1 << (uspi->s_apbshift + uspi->s_fpbshift);
481         if (ptr < (1 << (uspi->s_2apbshift + uspi->s_fpbshift))) {
482                 bh = GET_INODE_PTR(UFS_DIND_FRAGMENT + (ptr >> uspi->s_2apbshift));
483                 goto get_double;
484         }
485         ptr -= 1 << (uspi->s_2apbshift + uspi->s_fpbshift);
486         bh = GET_INODE_PTR(UFS_TIND_FRAGMENT + (ptr >> uspi->s_3apbshift));
487         bh = GET_INDIRECT_PTR((ptr >> uspi->s_2apbshift) & uspi->s_apbmask);
488 get_double:
489         bh = GET_INDIRECT_PTR((ptr >> uspi->s_apbshift) & uspi->s_apbmask);
490 get_indirect:
491         bh = GET_INDIRECT_DATABLOCK(ptr & uspi->s_apbmask);
492
493 #undef GET_INODE_DATABLOCK
494 #undef GET_INODE_PTR
495 #undef GET_INDIRECT_DATABLOCK
496 #undef GET_INDIRECT_PTR
497
498 out:
499         if (err)
500                 goto abort;
501         if (new)
502                 set_buffer_new(bh_result);
503         map_bh(bh_result, sb, phys);
504 abort:
505         if (needs_lock)
506                 unlock_ufs(sb);
507
508         return err;
509
510 abort_too_big:
511         ufs_warning(sb, "ufs_get_block", "block > big");
512         goto abort;
513 }
514
515 static int ufs_writepage(struct page *page, struct writeback_control *wbc)
516 {
517         return block_write_full_page(page,ufs_getfrag_block,wbc);
518 }
519
520 static int ufs_readpage(struct file *file, struct page *page)
521 {
522         return block_read_full_page(page,ufs_getfrag_block);
523 }
524
525 int ufs_prepare_chunk(struct page *page, loff_t pos, unsigned len)
526 {
527         return __block_write_begin(page, pos, len, ufs_getfrag_block);
528 }
529
530 static int ufs_write_begin(struct file *file, struct address_space *mapping,
531                         loff_t pos, unsigned len, unsigned flags,
532                         struct page **pagep, void **fsdata)
533 {
534         int ret;
535
536         ret = block_write_begin(mapping, pos, len, flags, pagep,
537                                 ufs_getfrag_block);
538         if (unlikely(ret)) {
539                 loff_t isize = mapping->host->i_size;
540                 if (pos + len > isize)
541                         vmtruncate(mapping->host, isize);
542         }
543
544         return ret;
545 }
546
547 static sector_t ufs_bmap(struct address_space *mapping, sector_t block)
548 {
549         return generic_block_bmap(mapping,block,ufs_getfrag_block);
550 }
551
552 const struct address_space_operations ufs_aops = {
553         .readpage = ufs_readpage,
554         .writepage = ufs_writepage,
555         .write_begin = ufs_write_begin,
556         .write_end = generic_write_end,
557         .bmap = ufs_bmap
558 };
559
560 static void ufs_set_inode_ops(struct inode *inode)
561 {
562         if (S_ISREG(inode->i_mode)) {
563                 inode->i_op = &ufs_file_inode_operations;
564                 inode->i_fop = &ufs_file_operations;
565                 inode->i_mapping->a_ops = &ufs_aops;
566         } else if (S_ISDIR(inode->i_mode)) {
567                 inode->i_op = &ufs_dir_inode_operations;
568                 inode->i_fop = &ufs_dir_operations;
569                 inode->i_mapping->a_ops = &ufs_aops;
570         } else if (S_ISLNK(inode->i_mode)) {
571                 if (!inode->i_blocks)
572                         inode->i_op = &ufs_fast_symlink_inode_operations;
573                 else {
574                         inode->i_op = &ufs_symlink_inode_operations;
575                         inode->i_mapping->a_ops = &ufs_aops;
576                 }
577         } else
578                 init_special_inode(inode, inode->i_mode,
579                                    ufs_get_inode_dev(inode->i_sb, UFS_I(inode)));
580 }
581
582 static int ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
583 {
584         struct ufs_inode_info *ufsi = UFS_I(inode);
585         struct super_block *sb = inode->i_sb;
586         mode_t mode;
587
588         /*
589          * Copy data to the in-core inode.
590          */
591         inode->i_mode = mode = fs16_to_cpu(sb, ufs_inode->ui_mode);
592         inode->i_nlink = fs16_to_cpu(sb, ufs_inode->ui_nlink);
593         if (inode->i_nlink == 0) {
594                 ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
595                 return -1;
596         }
597         
598         /*
599          * Linux now has 32-bit uid and gid, so we can support EFT.
600          */
601         inode->i_uid = ufs_get_inode_uid(sb, ufs_inode);
602         inode->i_gid = ufs_get_inode_gid(sb, ufs_inode);
603
604         inode->i_size = fs64_to_cpu(sb, ufs_inode->ui_size);
605         inode->i_atime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_atime.tv_sec);
606         inode->i_ctime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_ctime.tv_sec);
607         inode->i_mtime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_mtime.tv_sec);
608         inode->i_mtime.tv_nsec = 0;
609         inode->i_atime.tv_nsec = 0;
610         inode->i_ctime.tv_nsec = 0;
611         inode->i_blocks = fs32_to_cpu(sb, ufs_inode->ui_blocks);
612         inode->i_generation = fs32_to_cpu(sb, ufs_inode->ui_gen);
613         ufsi->i_flags = fs32_to_cpu(sb, ufs_inode->ui_flags);
614         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
615         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
616
617         
618         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
619                 memcpy(ufsi->i_u1.i_data, &ufs_inode->ui_u2.ui_addr,
620                        sizeof(ufs_inode->ui_u2.ui_addr));
621         } else {
622                 memcpy(ufsi->i_u1.i_symlink, ufs_inode->ui_u2.ui_symlink,
623                        sizeof(ufs_inode->ui_u2.ui_symlink) - 1);
624                 ufsi->i_u1.i_symlink[sizeof(ufs_inode->ui_u2.ui_symlink) - 1] = 0;
625         }
626         return 0;
627 }
628
629 static int ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
630 {
631         struct ufs_inode_info *ufsi = UFS_I(inode);
632         struct super_block *sb = inode->i_sb;
633         mode_t mode;
634
635         UFSD("Reading ufs2 inode, ino %lu\n", inode->i_ino);
636         /*
637          * Copy data to the in-core inode.
638          */
639         inode->i_mode = mode = fs16_to_cpu(sb, ufs2_inode->ui_mode);
640         inode->i_nlink = fs16_to_cpu(sb, ufs2_inode->ui_nlink);
641         if (inode->i_nlink == 0) {
642                 ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
643                 return -1;
644         }
645
646         /*
647          * Linux now has 32-bit uid and gid, so we can support EFT.
648          */
649         inode->i_uid = fs32_to_cpu(sb, ufs2_inode->ui_uid);
650         inode->i_gid = fs32_to_cpu(sb, ufs2_inode->ui_gid);
651
652         inode->i_size = fs64_to_cpu(sb, ufs2_inode->ui_size);
653         inode->i_atime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_atime);
654         inode->i_ctime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_ctime);
655         inode->i_mtime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_mtime);
656         inode->i_atime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_atimensec);
657         inode->i_ctime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_ctimensec);
658         inode->i_mtime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_mtimensec);
659         inode->i_blocks = fs64_to_cpu(sb, ufs2_inode->ui_blocks);
660         inode->i_generation = fs32_to_cpu(sb, ufs2_inode->ui_gen);
661         ufsi->i_flags = fs32_to_cpu(sb, ufs2_inode->ui_flags);
662         /*
663         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
664         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
665         */
666
667         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
668                 memcpy(ufsi->i_u1.u2_i_data, &ufs2_inode->ui_u2.ui_addr,
669                        sizeof(ufs2_inode->ui_u2.ui_addr));
670         } else {
671                 memcpy(ufsi->i_u1.i_symlink, ufs2_inode->ui_u2.ui_symlink,
672                        sizeof(ufs2_inode->ui_u2.ui_symlink) - 1);
673                 ufsi->i_u1.i_symlink[sizeof(ufs2_inode->ui_u2.ui_symlink) - 1] = 0;
674         }
675         return 0;
676 }
677
678 struct inode *ufs_iget(struct super_block *sb, unsigned long ino)
679 {
680         struct ufs_inode_info *ufsi;
681         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
682         struct buffer_head * bh;
683         struct inode *inode;
684         int err;
685
686         UFSD("ENTER, ino %lu\n", ino);
687
688         if (ino < UFS_ROOTINO || ino > (uspi->s_ncg * uspi->s_ipg)) {
689                 ufs_warning(sb, "ufs_read_inode", "bad inode number (%lu)\n",
690                             ino);
691                 return ERR_PTR(-EIO);
692         }
693
694         inode = iget_locked(sb, ino);
695         if (!inode)
696                 return ERR_PTR(-ENOMEM);
697         if (!(inode->i_state & I_NEW))
698                 return inode;
699
700         ufsi = UFS_I(inode);
701
702         bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino));
703         if (!bh) {
704                 ufs_warning(sb, "ufs_read_inode", "unable to read inode %lu\n",
705                             inode->i_ino);
706                 goto bad_inode;
707         }
708         if ((UFS_SB(sb)->s_flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) {
709                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
710
711                 err = ufs2_read_inode(inode,
712                                       ufs2_inode + ufs_inotofsbo(inode->i_ino));
713         } else {
714                 struct ufs_inode *ufs_inode = (struct ufs_inode *)bh->b_data;
715
716                 err = ufs1_read_inode(inode,
717                                       ufs_inode + ufs_inotofsbo(inode->i_ino));
718         }
719
720         if (err)
721                 goto bad_inode;
722         inode->i_version++;
723         ufsi->i_lastfrag =
724                 (inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift;
725         ufsi->i_dir_start_lookup = 0;
726         ufsi->i_osync = 0;
727
728         ufs_set_inode_ops(inode);
729
730         brelse(bh);
731
732         UFSD("EXIT\n");
733         unlock_new_inode(inode);
734         return inode;
735
736 bad_inode:
737         iget_failed(inode);
738         return ERR_PTR(-EIO);
739 }
740
741 static void ufs1_update_inode(struct inode *inode, struct ufs_inode *ufs_inode)
742 {
743         struct super_block *sb = inode->i_sb;
744         struct ufs_inode_info *ufsi = UFS_I(inode);
745
746         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
747         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
748
749         ufs_set_inode_uid(sb, ufs_inode, inode->i_uid);
750         ufs_set_inode_gid(sb, ufs_inode, inode->i_gid);
751                 
752         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
753         ufs_inode->ui_atime.tv_sec = cpu_to_fs32(sb, inode->i_atime.tv_sec);
754         ufs_inode->ui_atime.tv_usec = 0;
755         ufs_inode->ui_ctime.tv_sec = cpu_to_fs32(sb, inode->i_ctime.tv_sec);
756         ufs_inode->ui_ctime.tv_usec = 0;
757         ufs_inode->ui_mtime.tv_sec = cpu_to_fs32(sb, inode->i_mtime.tv_sec);
758         ufs_inode->ui_mtime.tv_usec = 0;
759         ufs_inode->ui_blocks = cpu_to_fs32(sb, inode->i_blocks);
760         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
761         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
762
763         if ((UFS_SB(sb)->s_flags & UFS_UID_MASK) == UFS_UID_EFT) {
764                 ufs_inode->ui_u3.ui_sun.ui_shadow = cpu_to_fs32(sb, ufsi->i_shadow);
765                 ufs_inode->ui_u3.ui_sun.ui_oeftflag = cpu_to_fs32(sb, ufsi->i_oeftflag);
766         }
767
768         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
769                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
770                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.i_data[0];
771         } else if (inode->i_blocks) {
772                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.i_data,
773                        sizeof(ufs_inode->ui_u2.ui_addr));
774         }
775         else {
776                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
777                        sizeof(ufs_inode->ui_u2.ui_symlink));
778         }
779
780         if (!inode->i_nlink)
781                 memset (ufs_inode, 0, sizeof(struct ufs_inode));
782 }
783
784 static void ufs2_update_inode(struct inode *inode, struct ufs2_inode *ufs_inode)
785 {
786         struct super_block *sb = inode->i_sb;
787         struct ufs_inode_info *ufsi = UFS_I(inode);
788
789         UFSD("ENTER\n");
790         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
791         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
792
793         ufs_inode->ui_uid = cpu_to_fs32(sb, inode->i_uid);
794         ufs_inode->ui_gid = cpu_to_fs32(sb, inode->i_gid);
795
796         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
797         ufs_inode->ui_atime = cpu_to_fs64(sb, inode->i_atime.tv_sec);
798         ufs_inode->ui_atimensec = cpu_to_fs32(sb, inode->i_atime.tv_nsec);
799         ufs_inode->ui_ctime = cpu_to_fs64(sb, inode->i_ctime.tv_sec);
800         ufs_inode->ui_ctimensec = cpu_to_fs32(sb, inode->i_ctime.tv_nsec);
801         ufs_inode->ui_mtime = cpu_to_fs64(sb, inode->i_mtime.tv_sec);
802         ufs_inode->ui_mtimensec = cpu_to_fs32(sb, inode->i_mtime.tv_nsec);
803
804         ufs_inode->ui_blocks = cpu_to_fs64(sb, inode->i_blocks);
805         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
806         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
807
808         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
809                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
810                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.u2_i_data[0];
811         } else if (inode->i_blocks) {
812                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.u2_i_data,
813                        sizeof(ufs_inode->ui_u2.ui_addr));
814         } else {
815                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
816                        sizeof(ufs_inode->ui_u2.ui_symlink));
817         }
818
819         if (!inode->i_nlink)
820                 memset (ufs_inode, 0, sizeof(struct ufs2_inode));
821         UFSD("EXIT\n");
822 }
823
824 static int ufs_update_inode(struct inode * inode, int do_sync)
825 {
826         struct super_block *sb = inode->i_sb;
827         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
828         struct buffer_head * bh;
829
830         UFSD("ENTER, ino %lu\n", inode->i_ino);
831
832         if (inode->i_ino < UFS_ROOTINO ||
833             inode->i_ino > (uspi->s_ncg * uspi->s_ipg)) {
834                 ufs_warning (sb, "ufs_read_inode", "bad inode number (%lu)\n", inode->i_ino);
835                 return -1;
836         }
837
838         bh = sb_bread(sb, ufs_inotofsba(inode->i_ino));
839         if (!bh) {
840                 ufs_warning (sb, "ufs_read_inode", "unable to read inode %lu\n", inode->i_ino);
841                 return -1;
842         }
843         if (uspi->fs_magic == UFS2_MAGIC) {
844                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
845
846                 ufs2_update_inode(inode,
847                                   ufs2_inode + ufs_inotofsbo(inode->i_ino));
848         } else {
849                 struct ufs_inode *ufs_inode = (struct ufs_inode *) bh->b_data;
850
851                 ufs1_update_inode(inode, ufs_inode + ufs_inotofsbo(inode->i_ino));
852         }
853                 
854         mark_buffer_dirty(bh);
855         if (do_sync)
856                 sync_dirty_buffer(bh);
857         brelse (bh);
858         
859         UFSD("EXIT\n");
860         return 0;
861 }
862
863 int ufs_write_inode(struct inode *inode, struct writeback_control *wbc)
864 {
865         int ret;
866         lock_ufs(inode->i_sb);
867         ret = ufs_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
868         unlock_ufs(inode->i_sb);
869         return ret;
870 }
871
872 int ufs_sync_inode (struct inode *inode)
873 {
874         return ufs_update_inode (inode, 1);
875 }
876
877 void ufs_evict_inode(struct inode * inode)
878 {
879         int want_delete = 0;
880
881         if (!inode->i_nlink && !is_bad_inode(inode))
882                 want_delete = 1;
883
884         truncate_inode_pages(&inode->i_data, 0);
885         if (want_delete) {
886                 loff_t old_i_size;
887                 /*UFS_I(inode)->i_dtime = CURRENT_TIME;*/
888                 lock_ufs(inode->i_sb);
889                 mark_inode_dirty(inode);
890                 ufs_update_inode(inode, IS_SYNC(inode));
891                 old_i_size = inode->i_size;
892                 inode->i_size = 0;
893                 if (inode->i_blocks && ufs_truncate(inode, old_i_size))
894                         ufs_warning(inode->i_sb, __func__, "ufs_truncate failed\n");
895                 unlock_ufs(inode->i_sb);
896         }
897
898         invalidate_inode_buffers(inode);
899         end_writeback(inode);
900
901         if (want_delete) {
902                 lock_ufs(inode->i_sb);
903                 ufs_free_inode (inode);
904                 unlock_ufs(inode->i_sb);
905         }
906 }