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