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TOMOYO Linux Cross Reference
Linux/fs/xfs/libxfs/xfs_dir2.c

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  1 /*
  2  * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
  3  * All Rights Reserved.
  4  *
  5  * This program is free software; you can redistribute it and/or
  6  * modify it under the terms of the GNU General Public License as
  7  * published by the Free Software Foundation.
  8  *
  9  * This program is distributed in the hope that it would be useful,
 10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12  * GNU General Public License for more details.
 13  *
 14  * You should have received a copy of the GNU General Public License
 15  * along with this program; if not, write the Free Software Foundation,
 16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 17  */
 18 #include "xfs.h"
 19 #include "xfs_fs.h"
 20 #include "xfs_format.h"
 21 #include "xfs_log_format.h"
 22 #include "xfs_trans_resv.h"
 23 #include "xfs_mount.h"
 24 #include "xfs_da_format.h"
 25 #include "xfs_da_btree.h"
 26 #include "xfs_inode.h"
 27 #include "xfs_trans.h"
 28 #include "xfs_inode_item.h"
 29 #include "xfs_bmap.h"
 30 #include "xfs_dir2.h"
 31 #include "xfs_dir2_priv.h"
 32 #include "xfs_error.h"
 33 #include "xfs_trace.h"
 34 
 35 struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2, XFS_DIR3_FT_DIR };
 36 
 37 /*
 38  * @mode, if set, indicates that the type field needs to be set up.
 39  * This uses the transformation from file mode to DT_* as defined in linux/fs.h
 40  * for file type specification. This will be propagated into the directory
 41  * structure if appropriate for the given operation and filesystem config.
 42  */
 43 const unsigned char xfs_mode_to_ftype[S_IFMT >> S_SHIFT] = {
 44         [0]                     = XFS_DIR3_FT_UNKNOWN,
 45         [S_IFREG >> S_SHIFT]    = XFS_DIR3_FT_REG_FILE,
 46         [S_IFDIR >> S_SHIFT]    = XFS_DIR3_FT_DIR,
 47         [S_IFCHR >> S_SHIFT]    = XFS_DIR3_FT_CHRDEV,
 48         [S_IFBLK >> S_SHIFT]    = XFS_DIR3_FT_BLKDEV,
 49         [S_IFIFO >> S_SHIFT]    = XFS_DIR3_FT_FIFO,
 50         [S_IFSOCK >> S_SHIFT]   = XFS_DIR3_FT_SOCK,
 51         [S_IFLNK >> S_SHIFT]    = XFS_DIR3_FT_SYMLINK,
 52 };
 53 
 54 /*
 55  * ASCII case-insensitive (ie. A-Z) support for directories that was
 56  * used in IRIX.
 57  */
 58 STATIC xfs_dahash_t
 59 xfs_ascii_ci_hashname(
 60         struct xfs_name *name)
 61 {
 62         xfs_dahash_t    hash;
 63         int             i;
 64 
 65         for (i = 0, hash = 0; i < name->len; i++)
 66                 hash = tolower(name->name[i]) ^ rol32(hash, 7);
 67 
 68         return hash;
 69 }
 70 
 71 STATIC enum xfs_dacmp
 72 xfs_ascii_ci_compname(
 73         struct xfs_da_args *args,
 74         const unsigned char *name,
 75         int             len)
 76 {
 77         enum xfs_dacmp  result;
 78         int             i;
 79 
 80         if (args->namelen != len)
 81                 return XFS_CMP_DIFFERENT;
 82 
 83         result = XFS_CMP_EXACT;
 84         for (i = 0; i < len; i++) {
 85                 if (args->name[i] == name[i])
 86                         continue;
 87                 if (tolower(args->name[i]) != tolower(name[i]))
 88                         return XFS_CMP_DIFFERENT;
 89                 result = XFS_CMP_CASE;
 90         }
 91 
 92         return result;
 93 }
 94 
 95 static struct xfs_nameops xfs_ascii_ci_nameops = {
 96         .hashname       = xfs_ascii_ci_hashname,
 97         .compname       = xfs_ascii_ci_compname,
 98 };
 99 
100 int
101 xfs_da_mount(
102         struct xfs_mount        *mp)
103 {
104         struct xfs_da_geometry  *dageo;
105         int                     nodehdr_size;
106 
107 
108         ASSERT(mp->m_sb.sb_versionnum & XFS_SB_VERSION_DIRV2BIT);
109         ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
110                XFS_MAX_BLOCKSIZE);
111 
112         mp->m_dir_inode_ops = xfs_dir_get_ops(mp, NULL);
113         mp->m_nondir_inode_ops = xfs_nondir_get_ops(mp, NULL);
114 
115         nodehdr_size = mp->m_dir_inode_ops->node_hdr_size;
116         mp->m_dir_geo = kmem_zalloc(sizeof(struct xfs_da_geometry),
117                                     KM_SLEEP | KM_MAYFAIL);
118         mp->m_attr_geo = kmem_zalloc(sizeof(struct xfs_da_geometry),
119                                      KM_SLEEP | KM_MAYFAIL);
120         if (!mp->m_dir_geo || !mp->m_attr_geo) {
121                 kmem_free(mp->m_dir_geo);
122                 kmem_free(mp->m_attr_geo);
123                 return -ENOMEM;
124         }
125 
126         /* set up directory geometry */
127         dageo = mp->m_dir_geo;
128         dageo->blklog = mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog;
129         dageo->fsblog = mp->m_sb.sb_blocklog;
130         dageo->blksize = 1 << dageo->blklog;
131         dageo->fsbcount = 1 << mp->m_sb.sb_dirblklog;
132 
133         /*
134          * Now we've set up the block conversion variables, we can calculate the
135          * segment block constants using the geometry structure.
136          */
137         dageo->datablk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_DATA_OFFSET);
138         dageo->leafblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_LEAF_OFFSET);
139         dageo->freeblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_FREE_OFFSET);
140         dageo->node_ents = (dageo->blksize - nodehdr_size) /
141                                 (uint)sizeof(xfs_da_node_entry_t);
142         dageo->magicpct = (dageo->blksize * 37) / 100;
143 
144         /* set up attribute geometry - single fsb only */
145         dageo = mp->m_attr_geo;
146         dageo->blklog = mp->m_sb.sb_blocklog;
147         dageo->fsblog = mp->m_sb.sb_blocklog;
148         dageo->blksize = 1 << dageo->blklog;
149         dageo->fsbcount = 1;
150         dageo->node_ents = (dageo->blksize - nodehdr_size) /
151                                 (uint)sizeof(xfs_da_node_entry_t);
152         dageo->magicpct = (dageo->blksize * 37) / 100;
153 
154         if (xfs_sb_version_hasasciici(&mp->m_sb))
155                 mp->m_dirnameops = &xfs_ascii_ci_nameops;
156         else
157                 mp->m_dirnameops = &xfs_default_nameops;
158 
159         return 0;
160 }
161 
162 void
163 xfs_da_unmount(
164         struct xfs_mount        *mp)
165 {
166         kmem_free(mp->m_dir_geo);
167         kmem_free(mp->m_attr_geo);
168 }
169 
170 /*
171  * Return 1 if directory contains only "." and "..".
172  */
173 int
174 xfs_dir_isempty(
175         xfs_inode_t     *dp)
176 {
177         xfs_dir2_sf_hdr_t       *sfp;
178 
179         ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
180         if (dp->i_d.di_size == 0)       /* might happen during shutdown. */
181                 return 1;
182         if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
183                 return 0;
184         sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
185         return !sfp->count;
186 }
187 
188 /*
189  * Validate a given inode number.
190  */
191 int
192 xfs_dir_ino_validate(
193         xfs_mount_t     *mp,
194         xfs_ino_t       ino)
195 {
196         xfs_agblock_t   agblkno;
197         xfs_agino_t     agino;
198         xfs_agnumber_t  agno;
199         int             ino_ok;
200         int             ioff;
201 
202         agno = XFS_INO_TO_AGNO(mp, ino);
203         agblkno = XFS_INO_TO_AGBNO(mp, ino);
204         ioff = XFS_INO_TO_OFFSET(mp, ino);
205         agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
206         ino_ok =
207                 agno < mp->m_sb.sb_agcount &&
208                 agblkno < mp->m_sb.sb_agblocks &&
209                 agblkno != 0 &&
210                 ioff < (1 << mp->m_sb.sb_inopblog) &&
211                 XFS_AGINO_TO_INO(mp, agno, agino) == ino;
212         if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
213                         XFS_RANDOM_DIR_INO_VALIDATE))) {
214                 xfs_warn(mp, "Invalid inode number 0x%Lx",
215                                 (unsigned long long) ino);
216                 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
217                 return -EFSCORRUPTED;
218         }
219         return 0;
220 }
221 
222 /*
223  * Initialize a directory with its "." and ".." entries.
224  */
225 int
226 xfs_dir_init(
227         xfs_trans_t     *tp,
228         xfs_inode_t     *dp,
229         xfs_inode_t     *pdp)
230 {
231         struct xfs_da_args *args;
232         int             error;
233 
234         ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
235         error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino);
236         if (error)
237                 return error;
238 
239         args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
240         if (!args)
241                 return -ENOMEM;
242 
243         args->geo = dp->i_mount->m_dir_geo;
244         args->dp = dp;
245         args->trans = tp;
246         error = xfs_dir2_sf_create(args, pdp->i_ino);
247         kmem_free(args);
248         return error;
249 }
250 
251 /*
252  * Enter a name in a directory, or check for available space.
253  * If inum is 0, only the available space test is performed.
254  */
255 int
256 xfs_dir_createname(
257         xfs_trans_t             *tp,
258         xfs_inode_t             *dp,
259         struct xfs_name         *name,
260         xfs_ino_t               inum,           /* new entry inode number */
261         xfs_fsblock_t           *first,         /* bmap's firstblock */
262         xfs_bmap_free_t         *flist,         /* bmap's freeblock list */
263         xfs_extlen_t            total)          /* bmap's total block count */
264 {
265         struct xfs_da_args      *args;
266         int                     rval;
267         int                     v;              /* type-checking value */
268 
269         ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
270         if (inum) {
271                 rval = xfs_dir_ino_validate(tp->t_mountp, inum);
272                 if (rval)
273                         return rval;
274                 XFS_STATS_INC(dp->i_mount, xs_dir_create);
275         }
276 
277         args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
278         if (!args)
279                 return -ENOMEM;
280 
281         args->geo = dp->i_mount->m_dir_geo;
282         args->name = name->name;
283         args->namelen = name->len;
284         args->filetype = name->type;
285         args->hashval = dp->i_mount->m_dirnameops->hashname(name);
286         args->inumber = inum;
287         args->dp = dp;
288         args->firstblock = first;
289         args->flist = flist;
290         args->total = total;
291         args->whichfork = XFS_DATA_FORK;
292         args->trans = tp;
293         args->op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
294         if (!inum)
295                 args->op_flags |= XFS_DA_OP_JUSTCHECK;
296 
297         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
298                 rval = xfs_dir2_sf_addname(args);
299                 goto out_free;
300         }
301 
302         rval = xfs_dir2_isblock(args, &v);
303         if (rval)
304                 goto out_free;
305         if (v) {
306                 rval = xfs_dir2_block_addname(args);
307                 goto out_free;
308         }
309 
310         rval = xfs_dir2_isleaf(args, &v);
311         if (rval)
312                 goto out_free;
313         if (v)
314                 rval = xfs_dir2_leaf_addname(args);
315         else
316                 rval = xfs_dir2_node_addname(args);
317 
318 out_free:
319         kmem_free(args);
320         return rval;
321 }
322 
323 /*
324  * If doing a CI lookup and case-insensitive match, dup actual name into
325  * args.value. Return EEXIST for success (ie. name found) or an error.
326  */
327 int
328 xfs_dir_cilookup_result(
329         struct xfs_da_args *args,
330         const unsigned char *name,
331         int             len)
332 {
333         if (args->cmpresult == XFS_CMP_DIFFERENT)
334                 return -ENOENT;
335         if (args->cmpresult != XFS_CMP_CASE ||
336                                         !(args->op_flags & XFS_DA_OP_CILOOKUP))
337                 return -EEXIST;
338 
339         args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL);
340         if (!args->value)
341                 return -ENOMEM;
342 
343         memcpy(args->value, name, len);
344         args->valuelen = len;
345         return -EEXIST;
346 }
347 
348 /*
349  * Lookup a name in a directory, give back the inode number.
350  * If ci_name is not NULL, returns the actual name in ci_name if it differs
351  * to name, or ci_name->name is set to NULL for an exact match.
352  */
353 
354 int
355 xfs_dir_lookup(
356         xfs_trans_t     *tp,
357         xfs_inode_t     *dp,
358         struct xfs_name *name,
359         xfs_ino_t       *inum,          /* out: inode number */
360         struct xfs_name *ci_name)       /* out: actual name if CI match */
361 {
362         struct xfs_da_args *args;
363         int             rval;
364         int             v;              /* type-checking value */
365         int             lock_mode;
366 
367         ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
368         XFS_STATS_INC(dp->i_mount, xs_dir_lookup);
369 
370         /*
371          * We need to use KM_NOFS here so that lockdep will not throw false
372          * positive deadlock warnings on a non-transactional lookup path. It is
373          * safe to recurse into inode recalim in that case, but lockdep can't
374          * easily be taught about it. Hence KM_NOFS avoids having to add more
375          * lockdep Doing this avoids having to add a bunch of lockdep class
376          * annotations into the reclaim path for the ilock.
377          */
378         args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
379         args->geo = dp->i_mount->m_dir_geo;
380         args->name = name->name;
381         args->namelen = name->len;
382         args->filetype = name->type;
383         args->hashval = dp->i_mount->m_dirnameops->hashname(name);
384         args->dp = dp;
385         args->whichfork = XFS_DATA_FORK;
386         args->trans = tp;
387         args->op_flags = XFS_DA_OP_OKNOENT;
388         if (ci_name)
389                 args->op_flags |= XFS_DA_OP_CILOOKUP;
390 
391         lock_mode = xfs_ilock_data_map_shared(dp);
392         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
393                 rval = xfs_dir2_sf_lookup(args);
394                 goto out_check_rval;
395         }
396 
397         rval = xfs_dir2_isblock(args, &v);
398         if (rval)
399                 goto out_free;
400         if (v) {
401                 rval = xfs_dir2_block_lookup(args);
402                 goto out_check_rval;
403         }
404 
405         rval = xfs_dir2_isleaf(args, &v);
406         if (rval)
407                 goto out_free;
408         if (v)
409                 rval = xfs_dir2_leaf_lookup(args);
410         else
411                 rval = xfs_dir2_node_lookup(args);
412 
413 out_check_rval:
414         if (rval == -EEXIST)
415                 rval = 0;
416         if (!rval) {
417                 *inum = args->inumber;
418                 if (ci_name) {
419                         ci_name->name = args->value;
420                         ci_name->len = args->valuelen;
421                 }
422         }
423 out_free:
424         xfs_iunlock(dp, lock_mode);
425         kmem_free(args);
426         return rval;
427 }
428 
429 /*
430  * Remove an entry from a directory.
431  */
432 int
433 xfs_dir_removename(
434         xfs_trans_t     *tp,
435         xfs_inode_t     *dp,
436         struct xfs_name *name,
437         xfs_ino_t       ino,
438         xfs_fsblock_t   *first,         /* bmap's firstblock */
439         xfs_bmap_free_t *flist,         /* bmap's freeblock list */
440         xfs_extlen_t    total)          /* bmap's total block count */
441 {
442         struct xfs_da_args *args;
443         int             rval;
444         int             v;              /* type-checking value */
445 
446         ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
447         XFS_STATS_INC(dp->i_mount, xs_dir_remove);
448 
449         args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
450         if (!args)
451                 return -ENOMEM;
452 
453         args->geo = dp->i_mount->m_dir_geo;
454         args->name = name->name;
455         args->namelen = name->len;
456         args->filetype = name->type;
457         args->hashval = dp->i_mount->m_dirnameops->hashname(name);
458         args->inumber = ino;
459         args->dp = dp;
460         args->firstblock = first;
461         args->flist = flist;
462         args->total = total;
463         args->whichfork = XFS_DATA_FORK;
464         args->trans = tp;
465 
466         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
467                 rval = xfs_dir2_sf_removename(args);
468                 goto out_free;
469         }
470 
471         rval = xfs_dir2_isblock(args, &v);
472         if (rval)
473                 goto out_free;
474         if (v) {
475                 rval = xfs_dir2_block_removename(args);
476                 goto out_free;
477         }
478 
479         rval = xfs_dir2_isleaf(args, &v);
480         if (rval)
481                 goto out_free;
482         if (v)
483                 rval = xfs_dir2_leaf_removename(args);
484         else
485                 rval = xfs_dir2_node_removename(args);
486 out_free:
487         kmem_free(args);
488         return rval;
489 }
490 
491 /*
492  * Replace the inode number of a directory entry.
493  */
494 int
495 xfs_dir_replace(
496         xfs_trans_t     *tp,
497         xfs_inode_t     *dp,
498         struct xfs_name *name,          /* name of entry to replace */
499         xfs_ino_t       inum,           /* new inode number */
500         xfs_fsblock_t   *first,         /* bmap's firstblock */
501         xfs_bmap_free_t *flist,         /* bmap's freeblock list */
502         xfs_extlen_t    total)          /* bmap's total block count */
503 {
504         struct xfs_da_args *args;
505         int             rval;
506         int             v;              /* type-checking value */
507 
508         ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
509 
510         rval = xfs_dir_ino_validate(tp->t_mountp, inum);
511         if (rval)
512                 return rval;
513 
514         args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
515         if (!args)
516                 return -ENOMEM;
517 
518         args->geo = dp->i_mount->m_dir_geo;
519         args->name = name->name;
520         args->namelen = name->len;
521         args->filetype = name->type;
522         args->hashval = dp->i_mount->m_dirnameops->hashname(name);
523         args->inumber = inum;
524         args->dp = dp;
525         args->firstblock = first;
526         args->flist = flist;
527         args->total = total;
528         args->whichfork = XFS_DATA_FORK;
529         args->trans = tp;
530 
531         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
532                 rval = xfs_dir2_sf_replace(args);
533                 goto out_free;
534         }
535 
536         rval = xfs_dir2_isblock(args, &v);
537         if (rval)
538                 goto out_free;
539         if (v) {
540                 rval = xfs_dir2_block_replace(args);
541                 goto out_free;
542         }
543 
544         rval = xfs_dir2_isleaf(args, &v);
545         if (rval)
546                 goto out_free;
547         if (v)
548                 rval = xfs_dir2_leaf_replace(args);
549         else
550                 rval = xfs_dir2_node_replace(args);
551 out_free:
552         kmem_free(args);
553         return rval;
554 }
555 
556 /*
557  * See if this entry can be added to the directory without allocating space.
558  */
559 int
560 xfs_dir_canenter(
561         xfs_trans_t     *tp,
562         xfs_inode_t     *dp,
563         struct xfs_name *name)          /* name of entry to add */
564 {
565         return xfs_dir_createname(tp, dp, name, 0, NULL, NULL, 0);
566 }
567 
568 /*
569  * Utility routines.
570  */
571 
572 /*
573  * Add a block to the directory.
574  *
575  * This routine is for data and free blocks, not leaf/node blocks which are
576  * handled by xfs_da_grow_inode.
577  */
578 int
579 xfs_dir2_grow_inode(
580         struct xfs_da_args      *args,
581         int                     space,  /* v2 dir's space XFS_DIR2_xxx_SPACE */
582         xfs_dir2_db_t           *dbp)   /* out: block number added */
583 {
584         struct xfs_inode        *dp = args->dp;
585         struct xfs_mount        *mp = dp->i_mount;
586         xfs_fileoff_t           bno;    /* directory offset of new block */
587         int                     count;  /* count of filesystem blocks */
588         int                     error;
589 
590         trace_xfs_dir2_grow_inode(args, space);
591 
592         /*
593          * Set lowest possible block in the space requested.
594          */
595         bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
596         count = args->geo->fsbcount;
597 
598         error = xfs_da_grow_inode_int(args, &bno, count);
599         if (error)
600                 return error;
601 
602         *dbp = xfs_dir2_da_to_db(args->geo, (xfs_dablk_t)bno);
603 
604         /*
605          * Update file's size if this is the data space and it grew.
606          */
607         if (space == XFS_DIR2_DATA_SPACE) {
608                 xfs_fsize_t     size;           /* directory file (data) size */
609 
610                 size = XFS_FSB_TO_B(mp, bno + count);
611                 if (size > dp->i_d.di_size) {
612                         dp->i_d.di_size = size;
613                         xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
614                 }
615         }
616         return 0;
617 }
618 
619 /*
620  * See if the directory is a single-block form directory.
621  */
622 int
623 xfs_dir2_isblock(
624         struct xfs_da_args      *args,
625         int                     *vp)    /* out: 1 is block, 0 is not block */
626 {
627         xfs_fileoff_t           last;   /* last file offset */
628         int                     rval;
629 
630         if ((rval = xfs_bmap_last_offset(args->dp, &last, XFS_DATA_FORK)))
631                 return rval;
632         rval = XFS_FSB_TO_B(args->dp->i_mount, last) == args->geo->blksize;
633         ASSERT(rval == 0 || args->dp->i_d.di_size == args->geo->blksize);
634         *vp = rval;
635         return 0;
636 }
637 
638 /*
639  * See if the directory is a single-leaf form directory.
640  */
641 int
642 xfs_dir2_isleaf(
643         struct xfs_da_args      *args,
644         int                     *vp)    /* out: 1 is block, 0 is not block */
645 {
646         xfs_fileoff_t           last;   /* last file offset */
647         int                     rval;
648 
649         if ((rval = xfs_bmap_last_offset(args->dp, &last, XFS_DATA_FORK)))
650                 return rval;
651         *vp = last == args->geo->leafblk + args->geo->fsbcount;
652         return 0;
653 }
654 
655 /*
656  * Remove the given block from the directory.
657  * This routine is used for data and free blocks, leaf/node are done
658  * by xfs_da_shrink_inode.
659  */
660 int
661 xfs_dir2_shrink_inode(
662         xfs_da_args_t   *args,
663         xfs_dir2_db_t   db,
664         struct xfs_buf  *bp)
665 {
666         xfs_fileoff_t   bno;            /* directory file offset */
667         xfs_dablk_t     da;             /* directory file offset */
668         int             done;           /* bunmap is finished */
669         xfs_inode_t     *dp;
670         int             error;
671         xfs_mount_t     *mp;
672         xfs_trans_t     *tp;
673 
674         trace_xfs_dir2_shrink_inode(args, db);
675 
676         dp = args->dp;
677         mp = dp->i_mount;
678         tp = args->trans;
679         da = xfs_dir2_db_to_da(args->geo, db);
680 
681         /* Unmap the fsblock(s). */
682         error = xfs_bunmapi(tp, dp, da, args->geo->fsbcount, 0, 0,
683                             args->firstblock, args->flist, &done);
684         if (error) {
685                 /*
686                  * ENOSPC actually can happen if we're in a removename with no
687                  * space reservation, and the resulting block removal would
688                  * cause a bmap btree split or conversion from extents to btree.
689                  * This can only happen for un-fragmented directory blocks,
690                  * since you need to be punching out the middle of an extent.
691                  * In this case we need to leave the block in the file, and not
692                  * binval it.  So the block has to be in a consistent empty
693                  * state and appropriately logged.  We don't free up the buffer,
694                  * the caller can tell it hasn't happened since it got an error
695                  * back.
696                  */
697                 return error;
698         }
699         ASSERT(done);
700         /*
701          * Invalidate the buffer from the transaction.
702          */
703         xfs_trans_binval(tp, bp);
704         /*
705          * If it's not a data block, we're done.
706          */
707         if (db >= xfs_dir2_byte_to_db(args->geo, XFS_DIR2_LEAF_OFFSET))
708                 return 0;
709         /*
710          * If the block isn't the last one in the directory, we're done.
711          */
712         if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(args->geo, db + 1, 0))
713                 return 0;
714         bno = da;
715         if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
716                 /*
717                  * This can't really happen unless there's kernel corruption.
718                  */
719                 return error;
720         }
721         if (db == args->geo->datablk)
722                 ASSERT(bno == 0);
723         else
724                 ASSERT(bno > 0);
725         /*
726          * Set the size to the new last block.
727          */
728         dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
729         xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
730         return 0;
731 }
732 

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