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Linux 3.12.28
[linux/fpc-iii.git] / fs / xfs / xfs_dir2.c
blobedf203ab50afa734a74faaace8e626721e7fc1bb
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_types.h"
21 #include "xfs_log.h"
22 #include "xfs_inum.h"
23 #include "xfs_trans.h"
24 #include "xfs_sb.h"
25 #include "xfs_ag.h"
26 #include "xfs_mount.h"
27 #include "xfs_da_btree.h"
28 #include "xfs_bmap_btree.h"
29 #include "xfs_alloc_btree.h"
30 #include "xfs_dinode.h"
31 #include "xfs_inode.h"
32 #include "xfs_inode_item.h"
33 #include "xfs_bmap.h"
34 #include "xfs_dir2_format.h"
35 #include "xfs_dir2.h"
36 #include "xfs_dir2_priv.h"
37 #include "xfs_error.h"
38 #include "xfs_trace.h"
39
40 struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2, XFS_DIR3_FT_DIR };
41
42
43 /*
44 * ASCII case-insensitive (ie. A-Z) support for directories that was
45 * used in IRIX.
46 */
47 STATIC xfs_dahash_t
48 xfs_ascii_ci_hashname(
49 struct xfs_name *name)
50 {
51 xfs_dahash_t hash;
52 int i;
53
54 for (i = 0, hash = 0; i < name->len; i++)
55 hash = tolower(name->name[i]) ^ rol32(hash, 7);
56
57 return hash;
58 }
59
60 STATIC enum xfs_dacmp
61 xfs_ascii_ci_compname(
62 struct xfs_da_args *args,
63 const unsigned char *name,
64 int len)
65 {
66 enum xfs_dacmp result;
67 int i;
68
69 if (args->namelen != len)
70 return XFS_CMP_DIFFERENT;
71
72 result = XFS_CMP_EXACT;
73 for (i = 0; i < len; i++) {
74 if (args->name[i] == name[i])
75 continue;
76 if (tolower(args->name[i]) != tolower(name[i]))
77 return XFS_CMP_DIFFERENT;
78 result = XFS_CMP_CASE;
79 }
80
81 return result;
82 }
83
84 static struct xfs_nameops xfs_ascii_ci_nameops = {
85 .hashname = xfs_ascii_ci_hashname,
86 .compname = xfs_ascii_ci_compname,
87 };
88
89 void
90 xfs_dir_mount(
91 xfs_mount_t *mp)
92 {
93 int nodehdr_size;
94
95
96 ASSERT(xfs_sb_version_hasdirv2(&mp->m_sb));
97 ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
98 XFS_MAX_BLOCKSIZE);
99 mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
100 mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
101 mp->m_dirdatablk = xfs_dir2_db_to_da(mp, XFS_DIR2_DATA_FIRSTDB(mp));
102 mp->m_dirleafblk = xfs_dir2_db_to_da(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
103 mp->m_dirfreeblk = xfs_dir2_db_to_da(mp, XFS_DIR2_FREE_FIRSTDB(mp));
104
105 nodehdr_size = __xfs_da3_node_hdr_size(xfs_sb_version_hascrc(&mp->m_sb));
106 mp->m_attr_node_ents = (mp->m_sb.sb_blocksize - nodehdr_size) /
107 (uint)sizeof(xfs_da_node_entry_t);
108 mp->m_dir_node_ents = (mp->m_dirblksize - nodehdr_size) /
109 (uint)sizeof(xfs_da_node_entry_t);
110
111 mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
112 if (xfs_sb_version_hasasciici(&mp->m_sb))
113 mp->m_dirnameops = &xfs_ascii_ci_nameops;
114 else
115 mp->m_dirnameops = &xfs_default_nameops;
116 }
117
118 /*
119 * Return 1 if directory contains only "." and "..".
120 */
121 int
122 xfs_dir_isempty(
123 xfs_inode_t *dp)
124 {
125 xfs_dir2_sf_hdr_t *sfp;
126
127 ASSERT(S_ISDIR(dp->i_d.di_mode));
128 if (dp->i_d.di_size == 0) /* might happen during shutdown. */
129 return 1;
130 if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
131 return 0;
132 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
133 return !sfp->count;
134 }
135
136 /*
137 * Validate a given inode number.
138 */
139 int
140 xfs_dir_ino_validate(
141 xfs_mount_t *mp,
142 xfs_ino_t ino)
143 {
144 xfs_agblock_t agblkno;
145 xfs_agino_t agino;
146 xfs_agnumber_t agno;
147 int ino_ok;
148 int ioff;
149
150 agno = XFS_INO_TO_AGNO(mp, ino);
151 agblkno = XFS_INO_TO_AGBNO(mp, ino);
152 ioff = XFS_INO_TO_OFFSET(mp, ino);
153 agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
154 ino_ok =
155 agno < mp->m_sb.sb_agcount &&
156 agblkno < mp->m_sb.sb_agblocks &&
157 agblkno != 0 &&
158 ioff < (1 << mp->m_sb.sb_inopblog) &&
159 XFS_AGINO_TO_INO(mp, agno, agino) == ino;
160 if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
161 XFS_RANDOM_DIR_INO_VALIDATE))) {
162 xfs_warn(mp, "Invalid inode number 0x%Lx",
163 (unsigned long long) ino);
164 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
165 return XFS_ERROR(EFSCORRUPTED);
166 }
167 return 0;
168 }
169
170 /*
171 * Initialize a directory with its "." and ".." entries.
172 */
173 int
174 xfs_dir_init(
175 xfs_trans_t *tp,
176 xfs_inode_t *dp,
177 xfs_inode_t *pdp)
178 {
179 xfs_da_args_t args;
180 int error;
181
182 memset((char *)&args, 0, sizeof(args));
183 args.dp = dp;
184 args.trans = tp;
185 ASSERT(S_ISDIR(dp->i_d.di_mode));
186 if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino)))
187 return error;
188 return xfs_dir2_sf_create(&args, pdp->i_ino);
189 }
190
191 /*
192 Enter a name in a directory.
193 */
194 int
195 xfs_dir_createname(
196 xfs_trans_t *tp,
197 xfs_inode_t *dp,
198 struct xfs_name *name,
199 xfs_ino_t inum, /* new entry inode number */
200 xfs_fsblock_t *first, /* bmap's firstblock */
201 xfs_bmap_free_t *flist, /* bmap's freeblock list */
202 xfs_extlen_t total) /* bmap's total block count */
203 {
204 xfs_da_args_t args;
205 int rval;
206 int v; /* type-checking value */
207
208 ASSERT(S_ISDIR(dp->i_d.di_mode));
209 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
210 return rval;
211 XFS_STATS_INC(xs_dir_create);
212
213 memset(&args, 0, sizeof(xfs_da_args_t));
214 args.name = name->name;
215 args.namelen = name->len;
216 args.filetype = name->type;
217 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
218 args.inumber = inum;
219 args.dp = dp;
220 args.firstblock = first;
221 args.flist = flist;
222 args.total = total;
223 args.whichfork = XFS_DATA_FORK;
224 args.trans = tp;
225 args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
226
227 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
228 rval = xfs_dir2_sf_addname(&args);
229 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
230 return rval;
231 else if (v)
232 rval = xfs_dir2_block_addname(&args);
233 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
234 return rval;
235 else if (v)
236 rval = xfs_dir2_leaf_addname(&args);
237 else
238 rval = xfs_dir2_node_addname(&args);
239 return rval;
240 }
241
242 /*
243 * If doing a CI lookup and case-insensitive match, dup actual name into
244 * args.value. Return EEXIST for success (ie. name found) or an error.
245 */
246 int
247 xfs_dir_cilookup_result(
248 struct xfs_da_args *args,
249 const unsigned char *name,
250 int len)
251 {
252 if (args->cmpresult == XFS_CMP_DIFFERENT)
253 return ENOENT;
254 if (args->cmpresult != XFS_CMP_CASE ||
255 !(args->op_flags & XFS_DA_OP_CILOOKUP))
256 return EEXIST;
257
258 args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL);
259 if (!args->value)
260 return ENOMEM;
261
262 memcpy(args->value, name, len);
263 args->valuelen = len;
264 return EEXIST;
265 }
266
267 /*
268 * Lookup a name in a directory, give back the inode number.
269 * If ci_name is not NULL, returns the actual name in ci_name if it differs
270 * to name, or ci_name->name is set to NULL for an exact match.
271 */
272
273 int
274 xfs_dir_lookup(
275 xfs_trans_t *tp,
276 xfs_inode_t *dp,
277 struct xfs_name *name,
278 xfs_ino_t *inum, /* out: inode number */
279 struct xfs_name *ci_name) /* out: actual name if CI match */
280 {
281 xfs_da_args_t args;
282 int rval;
283 int v; /* type-checking value */
284
285 ASSERT(S_ISDIR(dp->i_d.di_mode));
286 XFS_STATS_INC(xs_dir_lookup);
287
288 memset(&args, 0, sizeof(xfs_da_args_t));
289 args.name = name->name;
290 args.namelen = name->len;
291 args.filetype = name->type;
292 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
293 args.dp = dp;
294 args.whichfork = XFS_DATA_FORK;
295 args.trans = tp;
296 args.op_flags = XFS_DA_OP_OKNOENT;
297 if (ci_name)
298 args.op_flags |= XFS_DA_OP_CILOOKUP;
299
300 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
301 rval = xfs_dir2_sf_lookup(&args);
302 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
303 return rval;
304 else if (v)
305 rval = xfs_dir2_block_lookup(&args);
306 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
307 return rval;
308 else if (v)
309 rval = xfs_dir2_leaf_lookup(&args);
310 else
311 rval = xfs_dir2_node_lookup(&args);
312 if (rval == EEXIST)
313 rval = 0;
314 if (!rval) {
315 *inum = args.inumber;
316 if (ci_name) {
317 ci_name->name = args.value;
318 ci_name->len = args.valuelen;
319 }
320 }
321 return rval;
322 }
323
324 /*
325 * Remove an entry from a directory.
326 */
327 int
328 xfs_dir_removename(
329 xfs_trans_t *tp,
330 xfs_inode_t *dp,
331 struct xfs_name *name,
332 xfs_ino_t ino,
333 xfs_fsblock_t *first, /* bmap's firstblock */
334 xfs_bmap_free_t *flist, /* bmap's freeblock list */
335 xfs_extlen_t total) /* bmap's total block count */
336 {
337 xfs_da_args_t args;
338 int rval;
339 int v; /* type-checking value */
340
341 ASSERT(S_ISDIR(dp->i_d.di_mode));
342 XFS_STATS_INC(xs_dir_remove);
343
344 memset(&args, 0, sizeof(xfs_da_args_t));
345 args.name = name->name;
346 args.namelen = name->len;
347 args.filetype = name->type;
348 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
349 args.inumber = ino;
350 args.dp = dp;
351 args.firstblock = first;
352 args.flist = flist;
353 args.total = total;
354 args.whichfork = XFS_DATA_FORK;
355 args.trans = tp;
356
357 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
358 rval = xfs_dir2_sf_removename(&args);
359 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
360 return rval;
361 else if (v)
362 rval = xfs_dir2_block_removename(&args);
363 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
364 return rval;
365 else if (v)
366 rval = xfs_dir2_leaf_removename(&args);
367 else
368 rval = xfs_dir2_node_removename(&args);
369 return rval;
370 }
371
372 /*
373 * Replace the inode number of a directory entry.
374 */
375 int
376 xfs_dir_replace(
377 xfs_trans_t *tp,
378 xfs_inode_t *dp,
379 struct xfs_name *name, /* name of entry to replace */
380 xfs_ino_t inum, /* new inode number */
381 xfs_fsblock_t *first, /* bmap's firstblock */
382 xfs_bmap_free_t *flist, /* bmap's freeblock list */
383 xfs_extlen_t total) /* bmap's total block count */
384 {
385 xfs_da_args_t args;
386 int rval;
387 int v; /* type-checking value */
388
389 ASSERT(S_ISDIR(dp->i_d.di_mode));
390
391 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
392 return rval;
393
394 memset(&args, 0, sizeof(xfs_da_args_t));
395 args.name = name->name;
396 args.namelen = name->len;
397 args.filetype = name->type;
398 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
399 args.inumber = inum;
400 args.dp = dp;
401 args.firstblock = first;
402 args.flist = flist;
403 args.total = total;
404 args.whichfork = XFS_DATA_FORK;
405 args.trans = tp;
406
407 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
408 rval = xfs_dir2_sf_replace(&args);
409 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
410 return rval;
411 else if (v)
412 rval = xfs_dir2_block_replace(&args);
413 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
414 return rval;
415 else if (v)
416 rval = xfs_dir2_leaf_replace(&args);
417 else
418 rval = xfs_dir2_node_replace(&args);
419 return rval;
420 }
421
422 /*
423 * See if this entry can be added to the directory without allocating space.
424 * First checks that the caller couldn't reserve enough space (resblks = 0).
425 */
426 int
427 xfs_dir_canenter(
428 xfs_trans_t *tp,
429 xfs_inode_t *dp,
430 struct xfs_name *name, /* name of entry to add */
431 uint resblks)
432 {
433 xfs_da_args_t args;
434 int rval;
435 int v; /* type-checking value */
436
437 if (resblks)
438 return 0;
439
440 ASSERT(S_ISDIR(dp->i_d.di_mode));
441
442 memset(&args, 0, sizeof(xfs_da_args_t));
443 args.name = name->name;
444 args.namelen = name->len;
445 args.filetype = name->type;
446 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
447 args.dp = dp;
448 args.whichfork = XFS_DATA_FORK;
449 args.trans = tp;
450 args.op_flags = XFS_DA_OP_JUSTCHECK | XFS_DA_OP_ADDNAME |
451 XFS_DA_OP_OKNOENT;
452
453 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
454 rval = xfs_dir2_sf_addname(&args);
455 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
456 return rval;
457 else if (v)
458 rval = xfs_dir2_block_addname(&args);
459 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
460 return rval;
461 else if (v)
462 rval = xfs_dir2_leaf_addname(&args);
463 else
464 rval = xfs_dir2_node_addname(&args);
465 return rval;
466 }
467
468 /*
469 * Utility routines.
470 */
471
472 /*
473 * Add a block to the directory.
474 *
475 * This routine is for data and free blocks, not leaf/node blocks which are
476 * handled by xfs_da_grow_inode.
477 */
478 int
479 xfs_dir2_grow_inode(
480 struct xfs_da_args *args,
481 int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
482 xfs_dir2_db_t *dbp) /* out: block number added */
483 {
484 struct xfs_inode *dp = args->dp;
485 struct xfs_mount *mp = dp->i_mount;
486 xfs_fileoff_t bno; /* directory offset of new block */
487 int count; /* count of filesystem blocks */
488 int error;
489
490 trace_xfs_dir2_grow_inode(args, space);
491
492 /*
493 * Set lowest possible block in the space requested.
494 */
495 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
496 count = mp->m_dirblkfsbs;
497
498 error = xfs_da_grow_inode_int(args, &bno, count);
499 if (error)
500 return error;
501
502 *dbp = xfs_dir2_da_to_db(mp, (xfs_dablk_t)bno);
503
504 /*
505 * Update file's size if this is the data space and it grew.
506 */
507 if (space == XFS_DIR2_DATA_SPACE) {
508 xfs_fsize_t size; /* directory file (data) size */
509
510 size = XFS_FSB_TO_B(mp, bno + count);
511 if (size > dp->i_d.di_size) {
512 dp->i_d.di_size = size;
513 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
514 }
515 }
516 return 0;
517 }
518
519 /*
520 * See if the directory is a single-block form directory.
521 */
522 int
523 xfs_dir2_isblock(
524 xfs_trans_t *tp,
525 xfs_inode_t *dp,
526 int *vp) /* out: 1 is block, 0 is not block */
527 {
528 xfs_fileoff_t last; /* last file offset */
529 xfs_mount_t *mp;
530 int rval;
531
532 mp = dp->i_mount;
533 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
534 return rval;
535 rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
536 ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
537 *vp = rval;
538 return 0;
539 }
540
541 /*
542 * See if the directory is a single-leaf form directory.
543 */
544 int
545 xfs_dir2_isleaf(
546 xfs_trans_t *tp,
547 xfs_inode_t *dp,
548 int *vp) /* out: 1 is leaf, 0 is not leaf */
549 {
550 xfs_fileoff_t last; /* last file offset */
551 xfs_mount_t *mp;
552 int rval;
553
554 mp = dp->i_mount;
555 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
556 return rval;
557 *vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
558 return 0;
559 }
560
561 /*
562 * Remove the given block from the directory.
563 * This routine is used for data and free blocks, leaf/node are done
564 * by xfs_da_shrink_inode.
565 */
566 int
567 xfs_dir2_shrink_inode(
568 xfs_da_args_t *args,
569 xfs_dir2_db_t db,
570 struct xfs_buf *bp)
571 {
572 xfs_fileoff_t bno; /* directory file offset */
573 xfs_dablk_t da; /* directory file offset */
574 int done; /* bunmap is finished */
575 xfs_inode_t *dp;
576 int error;
577 xfs_mount_t *mp;
578 xfs_trans_t *tp;
579
580 trace_xfs_dir2_shrink_inode(args, db);
581
582 dp = args->dp;
583 mp = dp->i_mount;
584 tp = args->trans;
585 da = xfs_dir2_db_to_da(mp, db);
586 /*
587 * Unmap the fsblock(s).
588 */
589 if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
590 XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
591 &done))) {
592 /*
593 * ENOSPC actually can happen if we're in a removename with
594 * no space reservation, and the resulting block removal
595 * would cause a bmap btree split or conversion from extents
596 * to btree. This can only happen for un-fragmented
597 * directory blocks, since you need to be punching out
598 * the middle of an extent.
599 * In this case we need to leave the block in the file,
600 * and not binval it.
601 * So the block has to be in a consistent empty state
602 * and appropriately logged.
603 * We don't free up the buffer, the caller can tell it
604 * hasn't happened since it got an error back.
605 */
606 return error;
607 }
608 ASSERT(done);
609 /*
610 * Invalidate the buffer from the transaction.
611 */
612 xfs_trans_binval(tp, bp);
613 /*
614 * If it's not a data block, we're done.
615 */
616 if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
617 return 0;
618 /*
619 * If the block isn't the last one in the directory, we're done.
620 */
621 if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(mp, db + 1, 0))
622 return 0;
623 bno = da;
624 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
625 /*
626 * This can't really happen unless there's kernel corruption.
627 */
628 return error;
629 }
630 if (db == mp->m_dirdatablk)
631 ASSERT(bno == 0);
632 else
633 ASSERT(bno > 0);
634 /*
635 * Set the size to the new last block.
636 */
637 dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
638 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
639 return 0;
640 }
Linux with added FPC-III support