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fix O_SYNC|O_APPEND syncing the wrong range on write()
[linux/fpc-iii.git] / fs / xfs / xfs_dir2.c
blobce16ef02997a9b27e77293033f84366919fe0e48
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_inum.h"
24 #include "xfs_sb.h"
25 #include "xfs_ag.h"
26 #include "xfs_mount.h"
27 #include "xfs_da_format.h"
28 #include "xfs_da_btree.h"
29 #include "xfs_inode.h"
30 #include "xfs_trans.h"
31 #include "xfs_inode_item.h"
32 #include "xfs_bmap.h"
33 #include "xfs_dir2.h"
34 #include "xfs_dir2_priv.h"
35 #include "xfs_error.h"
36 #include "xfs_trace.h"
37 #include "xfs_dinode.h"
38
39 struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2, XFS_DIR3_FT_DIR };
40
41
42 /*
43 * ASCII case-insensitive (ie. A-Z) support for directories that was
44 * used in IRIX.
45 */
46 STATIC xfs_dahash_t
47 xfs_ascii_ci_hashname(
48 struct xfs_name *name)
49 {
50 xfs_dahash_t hash;
51 int i;
52
53 for (i = 0, hash = 0; i < name->len; i++)
54 hash = tolower(name->name[i]) ^ rol32(hash, 7);
55
56 return hash;
57 }
58
59 STATIC enum xfs_dacmp
60 xfs_ascii_ci_compname(
61 struct xfs_da_args *args,
62 const unsigned char *name,
63 int len)
64 {
65 enum xfs_dacmp result;
66 int i;
67
68 if (args->namelen != len)
69 return XFS_CMP_DIFFERENT;
70
71 result = XFS_CMP_EXACT;
72 for (i = 0; i < len; i++) {
73 if (args->name[i] == name[i])
74 continue;
75 if (tolower(args->name[i]) != tolower(name[i]))
76 return XFS_CMP_DIFFERENT;
77 result = XFS_CMP_CASE;
78 }
79
80 return result;
81 }
82
83 static struct xfs_nameops xfs_ascii_ci_nameops = {
84 .hashname = xfs_ascii_ci_hashname,
85 .compname = xfs_ascii_ci_compname,
86 };
87
88 void
89 xfs_dir_mount(
90 xfs_mount_t *mp)
91 {
92 int nodehdr_size;
93
94
95 ASSERT(xfs_sb_version_hasdirv2(&mp->m_sb));
96 ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
97 XFS_MAX_BLOCKSIZE);
98
99 mp->m_dir_inode_ops = xfs_dir_get_ops(mp, NULL);
100 mp->m_nondir_inode_ops = xfs_nondir_get_ops(mp, NULL);
101
102 mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
103 mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
104 mp->m_dirdatablk = xfs_dir2_db_to_da(mp, XFS_DIR2_DATA_FIRSTDB(mp));
105 mp->m_dirleafblk = xfs_dir2_db_to_da(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
106 mp->m_dirfreeblk = xfs_dir2_db_to_da(mp, XFS_DIR2_FREE_FIRSTDB(mp));
107
108 nodehdr_size = mp->m_dir_inode_ops->node_hdr_size;
109 mp->m_attr_node_ents = (mp->m_sb.sb_blocksize - nodehdr_size) /
110 (uint)sizeof(xfs_da_node_entry_t);
111 mp->m_dir_node_ents = (mp->m_dirblksize - nodehdr_size) /
112 (uint)sizeof(xfs_da_node_entry_t);
113
114 mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
115 if (xfs_sb_version_hasasciici(&mp->m_sb))
116 mp->m_dirnameops = &xfs_ascii_ci_nameops;
117 else
118 mp->m_dirnameops = &xfs_default_nameops;
119
120 }
121
122 /*
123 * Return 1 if directory contains only "." and "..".
124 */
125 int
126 xfs_dir_isempty(
127 xfs_inode_t *dp)
128 {
129 xfs_dir2_sf_hdr_t *sfp;
130
131 ASSERT(S_ISDIR(dp->i_d.di_mode));
132 if (dp->i_d.di_size == 0) /* might happen during shutdown. */
133 return 1;
134 if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
135 return 0;
136 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
137 return !sfp->count;
138 }
139
140 /*
141 * Validate a given inode number.
142 */
143 int
144 xfs_dir_ino_validate(
145 xfs_mount_t *mp,
146 xfs_ino_t ino)
147 {
148 xfs_agblock_t agblkno;
149 xfs_agino_t agino;
150 xfs_agnumber_t agno;
151 int ino_ok;
152 int ioff;
153
154 agno = XFS_INO_TO_AGNO(mp, ino);
155 agblkno = XFS_INO_TO_AGBNO(mp, ino);
156 ioff = XFS_INO_TO_OFFSET(mp, ino);
157 agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
158 ino_ok =
159 agno < mp->m_sb.sb_agcount &&
160 agblkno < mp->m_sb.sb_agblocks &&
161 agblkno != 0 &&
162 ioff < (1 << mp->m_sb.sb_inopblog) &&
163 XFS_AGINO_TO_INO(mp, agno, agino) == ino;
164 if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
165 XFS_RANDOM_DIR_INO_VALIDATE))) {
166 xfs_warn(mp, "Invalid inode number 0x%Lx",
167 (unsigned long long) ino);
168 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
169 return XFS_ERROR(EFSCORRUPTED);
170 }
171 return 0;
172 }
173
174 /*
175 * Initialize a directory with its "." and ".." entries.
176 */
177 int
178 xfs_dir_init(
179 xfs_trans_t *tp,
180 xfs_inode_t *dp,
181 xfs_inode_t *pdp)
182 {
183 xfs_da_args_t args;
184 int error;
185
186 memset((char *)&args, 0, sizeof(args));
187 args.dp = dp;
188 args.trans = tp;
189 ASSERT(S_ISDIR(dp->i_d.di_mode));
190 if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino)))
191 return error;
192 return xfs_dir2_sf_create(&args, pdp->i_ino);
193 }
194
195 /*
196 Enter a name in a directory.
197 */
198 int
199 xfs_dir_createname(
200 xfs_trans_t *tp,
201 xfs_inode_t *dp,
202 struct xfs_name *name,
203 xfs_ino_t inum, /* new entry inode number */
204 xfs_fsblock_t *first, /* bmap's firstblock */
205 xfs_bmap_free_t *flist, /* bmap's freeblock list */
206 xfs_extlen_t total) /* bmap's total block count */
207 {
208 xfs_da_args_t args;
209 int rval;
210 int v; /* type-checking value */
211
212 ASSERT(S_ISDIR(dp->i_d.di_mode));
213 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
214 return rval;
215 XFS_STATS_INC(xs_dir_create);
216
217 memset(&args, 0, sizeof(xfs_da_args_t));
218 args.name = name->name;
219 args.namelen = name->len;
220 args.filetype = name->type;
221 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
222 args.inumber = inum;
223 args.dp = dp;
224 args.firstblock = first;
225 args.flist = flist;
226 args.total = total;
227 args.whichfork = XFS_DATA_FORK;
228 args.trans = tp;
229 args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
230
231 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
232 rval = xfs_dir2_sf_addname(&args);
233 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
234 return rval;
235 else if (v)
236 rval = xfs_dir2_block_addname(&args);
237 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
238 return rval;
239 else if (v)
240 rval = xfs_dir2_leaf_addname(&args);
241 else
242 rval = xfs_dir2_node_addname(&args);
243 return rval;
244 }
245
246 /*
247 * If doing a CI lookup and case-insensitive match, dup actual name into
248 * args.value. Return EEXIST for success (ie. name found) or an error.
249 */
250 int
251 xfs_dir_cilookup_result(
252 struct xfs_da_args *args,
253 const unsigned char *name,
254 int len)
255 {
256 if (args->cmpresult == XFS_CMP_DIFFERENT)
257 return ENOENT;
258 if (args->cmpresult != XFS_CMP_CASE ||
259 !(args->op_flags & XFS_DA_OP_CILOOKUP))
260 return EEXIST;
261
262 args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL);
263 if (!args->value)
264 return ENOMEM;
265
266 memcpy(args->value, name, len);
267 args->valuelen = len;
268 return EEXIST;
269 }
270
271 /*
272 * Lookup a name in a directory, give back the inode number.
273 * If ci_name is not NULL, returns the actual name in ci_name if it differs
274 * to name, or ci_name->name is set to NULL for an exact match.
275 */
276
277 int
278 xfs_dir_lookup(
279 xfs_trans_t *tp,
280 xfs_inode_t *dp,
281 struct xfs_name *name,
282 xfs_ino_t *inum, /* out: inode number */
283 struct xfs_name *ci_name) /* out: actual name if CI match */
284 {
285 xfs_da_args_t args;
286 int rval;
287 int v; /* type-checking value */
288
289 ASSERT(S_ISDIR(dp->i_d.di_mode));
290 XFS_STATS_INC(xs_dir_lookup);
291
292 memset(&args, 0, sizeof(xfs_da_args_t));
293 args.name = name->name;
294 args.namelen = name->len;
295 args.filetype = name->type;
296 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
297 args.dp = dp;
298 args.whichfork = XFS_DATA_FORK;
299 args.trans = tp;
300 args.op_flags = XFS_DA_OP_OKNOENT;
301 if (ci_name)
302 args.op_flags |= XFS_DA_OP_CILOOKUP;
303
304 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
305 rval = xfs_dir2_sf_lookup(&args);
306 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
307 return rval;
308 else if (v)
309 rval = xfs_dir2_block_lookup(&args);
310 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
311 return rval;
312 else if (v)
313 rval = xfs_dir2_leaf_lookup(&args);
314 else
315 rval = xfs_dir2_node_lookup(&args);
316 if (rval == EEXIST)
317 rval = 0;
318 if (!rval) {
319 *inum = args.inumber;
320 if (ci_name) {
321 ci_name->name = args.value;
322 ci_name->len = args.valuelen;
323 }
324 }
325 return rval;
326 }
327
328 /*
329 * Remove an entry from a directory.
330 */
331 int
332 xfs_dir_removename(
333 xfs_trans_t *tp,
334 xfs_inode_t *dp,
335 struct xfs_name *name,
336 xfs_ino_t ino,
337 xfs_fsblock_t *first, /* bmap's firstblock */
338 xfs_bmap_free_t *flist, /* bmap's freeblock list */
339 xfs_extlen_t total) /* bmap's total block count */
340 {
341 xfs_da_args_t args;
342 int rval;
343 int v; /* type-checking value */
344
345 ASSERT(S_ISDIR(dp->i_d.di_mode));
346 XFS_STATS_INC(xs_dir_remove);
347
348 memset(&args, 0, sizeof(xfs_da_args_t));
349 args.name = name->name;
350 args.namelen = name->len;
351 args.filetype = name->type;
352 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
353 args.inumber = ino;
354 args.dp = dp;
355 args.firstblock = first;
356 args.flist = flist;
357 args.total = total;
358 args.whichfork = XFS_DATA_FORK;
359 args.trans = tp;
360
361 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
362 rval = xfs_dir2_sf_removename(&args);
363 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
364 return rval;
365 else if (v)
366 rval = xfs_dir2_block_removename(&args);
367 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
368 return rval;
369 else if (v)
370 rval = xfs_dir2_leaf_removename(&args);
371 else
372 rval = xfs_dir2_node_removename(&args);
373 return rval;
374 }
375
376 /*
377 * Replace the inode number of a directory entry.
378 */
379 int
380 xfs_dir_replace(
381 xfs_trans_t *tp,
382 xfs_inode_t *dp,
383 struct xfs_name *name, /* name of entry to replace */
384 xfs_ino_t inum, /* new inode number */
385 xfs_fsblock_t *first, /* bmap's firstblock */
386 xfs_bmap_free_t *flist, /* bmap's freeblock list */
387 xfs_extlen_t total) /* bmap's total block count */
388 {
389 xfs_da_args_t args;
390 int rval;
391 int v; /* type-checking value */
392
393 ASSERT(S_ISDIR(dp->i_d.di_mode));
394
395 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
396 return rval;
397
398 memset(&args, 0, sizeof(xfs_da_args_t));
399 args.name = name->name;
400 args.namelen = name->len;
401 args.filetype = name->type;
402 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
403 args.inumber = inum;
404 args.dp = dp;
405 args.firstblock = first;
406 args.flist = flist;
407 args.total = total;
408 args.whichfork = XFS_DATA_FORK;
409 args.trans = tp;
410
411 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
412 rval = xfs_dir2_sf_replace(&args);
413 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
414 return rval;
415 else if (v)
416 rval = xfs_dir2_block_replace(&args);
417 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
418 return rval;
419 else if (v)
420 rval = xfs_dir2_leaf_replace(&args);
421 else
422 rval = xfs_dir2_node_replace(&args);
423 return rval;
424 }
425
426 /*
427 * See if this entry can be added to the directory without allocating space.
428 * First checks that the caller couldn't reserve enough space (resblks = 0).
429 */
430 int
431 xfs_dir_canenter(
432 xfs_trans_t *tp,
433 xfs_inode_t *dp,
434 struct xfs_name *name, /* name of entry to add */
435 uint resblks)
436 {
437 xfs_da_args_t args;
438 int rval;
439 int v; /* type-checking value */
440
441 if (resblks)
442 return 0;
443
444 ASSERT(S_ISDIR(dp->i_d.di_mode));
445
446 memset(&args, 0, sizeof(xfs_da_args_t));
447 args.name = name->name;
448 args.namelen = name->len;
449 args.filetype = name->type;
450 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
451 args.dp = dp;
452 args.whichfork = XFS_DATA_FORK;
453 args.trans = tp;
454 args.op_flags = XFS_DA_OP_JUSTCHECK | XFS_DA_OP_ADDNAME |
455 XFS_DA_OP_OKNOENT;
456
457 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
458 rval = xfs_dir2_sf_addname(&args);
459 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
460 return rval;
461 else if (v)
462 rval = xfs_dir2_block_addname(&args);
463 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
464 return rval;
465 else if (v)
466 rval = xfs_dir2_leaf_addname(&args);
467 else
468 rval = xfs_dir2_node_addname(&args);
469 return rval;
470 }
471
472 /*
473 * Utility routines.
474 */
475
476 /*
477 * Add a block to the directory.
478 *
479 * This routine is for data and free blocks, not leaf/node blocks which are
480 * handled by xfs_da_grow_inode.
481 */
482 int
483 xfs_dir2_grow_inode(
484 struct xfs_da_args *args,
485 int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
486 xfs_dir2_db_t *dbp) /* out: block number added */
487 {
488 struct xfs_inode *dp = args->dp;
489 struct xfs_mount *mp = dp->i_mount;
490 xfs_fileoff_t bno; /* directory offset of new block */
491 int count; /* count of filesystem blocks */
492 int error;
493
494 trace_xfs_dir2_grow_inode(args, space);
495
496 /*
497 * Set lowest possible block in the space requested.
498 */
499 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
500 count = mp->m_dirblkfsbs;
501
502 error = xfs_da_grow_inode_int(args, &bno, count);
503 if (error)
504 return error;
505
506 *dbp = xfs_dir2_da_to_db(mp, (xfs_dablk_t)bno);
507
508 /*
509 * Update file's size if this is the data space and it grew.
510 */
511 if (space == XFS_DIR2_DATA_SPACE) {
512 xfs_fsize_t size; /* directory file (data) size */
513
514 size = XFS_FSB_TO_B(mp, bno + count);
515 if (size > dp->i_d.di_size) {
516 dp->i_d.di_size = size;
517 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
518 }
519 }
520 return 0;
521 }
522
523 /*
524 * See if the directory is a single-block form directory.
525 */
526 int
527 xfs_dir2_isblock(
528 xfs_trans_t *tp,
529 xfs_inode_t *dp,
530 int *vp) /* out: 1 is block, 0 is not block */
531 {
532 xfs_fileoff_t last; /* last file offset */
533 xfs_mount_t *mp;
534 int rval;
535
536 mp = dp->i_mount;
537 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
538 return rval;
539 rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
540 ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
541 *vp = rval;
542 return 0;
543 }
544
545 /*
546 * See if the directory is a single-leaf form directory.
547 */
548 int
549 xfs_dir2_isleaf(
550 xfs_trans_t *tp,
551 xfs_inode_t *dp,
552 int *vp) /* out: 1 is leaf, 0 is not leaf */
553 {
554 xfs_fileoff_t last; /* last file offset */
555 xfs_mount_t *mp;
556 int rval;
557
558 mp = dp->i_mount;
559 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
560 return rval;
561 *vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
562 return 0;
563 }
564
565 /*
566 * Remove the given block from the directory.
567 * This routine is used for data and free blocks, leaf/node are done
568 * by xfs_da_shrink_inode.
569 */
570 int
571 xfs_dir2_shrink_inode(
572 xfs_da_args_t *args,
573 xfs_dir2_db_t db,
574 struct xfs_buf *bp)
575 {
576 xfs_fileoff_t bno; /* directory file offset */
577 xfs_dablk_t da; /* directory file offset */
578 int done; /* bunmap is finished */
579 xfs_inode_t *dp;
580 int error;
581 xfs_mount_t *mp;
582 xfs_trans_t *tp;
583
584 trace_xfs_dir2_shrink_inode(args, db);
585
586 dp = args->dp;
587 mp = dp->i_mount;
588 tp = args->trans;
589 da = xfs_dir2_db_to_da(mp, db);
590 /*
591 * Unmap the fsblock(s).
592 */
593 if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
594 XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
595 &done))) {
596 /*
597 * ENOSPC actually can happen if we're in a removename with
598 * no space reservation, and the resulting block removal
599 * would cause a bmap btree split or conversion from extents
600 * to btree. This can only happen for un-fragmented
601 * directory blocks, since you need to be punching out
602 * the middle of an extent.
603 * In this case we need to leave the block in the file,
604 * and not binval it.
605 * So the block has to be in a consistent empty state
606 * and appropriately logged.
607 * We don't free up the buffer, the caller can tell it
608 * hasn't happened since it got an error back.
609 */
610 return error;
611 }
612 ASSERT(done);
613 /*
614 * Invalidate the buffer from the transaction.
615 */
616 xfs_trans_binval(tp, bp);
617 /*
618 * If it's not a data block, we're done.
619 */
620 if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
621 return 0;
622 /*
623 * If the block isn't the last one in the directory, we're done.
624 */
625 if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(mp, db + 1, 0))
626 return 0;
627 bno = da;
628 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
629 /*
630 * This can't really happen unless there's kernel corruption.
631 */
632 return error;
633 }
634 if (db == mp->m_dirdatablk)
635 ASSERT(bno == 0);
636 else
637 ASSERT(bno > 0);
638 /*
639 * Set the size to the new last block.
640 */
641 dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
642 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
643 return 0;
644 }
Linux with added FPC-III support