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[XFS] Fix a noatime regression related to updating inode atime field on
[linux-2.6-block.git] / fs / xfs / xfs_dir.c
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1da177e4 1/*
7b718769
NS		 2 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
1da177e4 4 *
7b718769
NS		 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
1da177e4
LT		 7 * published by the Free Software Foundation.
8 *
7b718769
NS		 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.
1da177e4 13 *
7b718769
NS		 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
1da177e4 17 */
1da177e4 18#include "xfs.h"
a844f451 19#include "xfs_fs.h"
1da177e4 20#include "xfs_types.h"
1da177e4 21#include "xfs_log.h"
a844f451 22#include "xfs_inum.h"
1da177e4
LT		 23#include "xfs_trans.h"
24#include "xfs_sb.h"
25#include "xfs_dir.h"
26#include "xfs_dir2.h"
27#include "xfs_dmapi.h"
28#include "xfs_mount.h"
a844f451 29#include "xfs_da_btree.h"
1da177e4 30#include "xfs_bmap_btree.h"
a844f451 31#include "xfs_alloc_btree.h"
1da177e4
LT		 32#include "xfs_ialloc_btree.h"
33#include "xfs_alloc.h"
34#include "xfs_btree.h"
1da177e4
LT		 35#include "xfs_dir_sf.h"
36#include "xfs_dir2_sf.h"
a844f451 37#include "xfs_attr_sf.h"
1da177e4
LT		 38#include "xfs_dinode.h"
39#include "xfs_inode.h"
40#include "xfs_bmap.h"
1da177e4
LT		 41#include "xfs_dir_leaf.h"
42#include "xfs_error.h"
43
44/*
45 * xfs_dir.c
46 *
47 * Provide the external interfaces to manage directories.
48 */
49
50/*========================================================================
51 * Function prototypes for the kernel.
52 *========================================================================*/
53
54/*
55 * Functions for the dirops interfaces.
56 */
57static void xfs_dir_mount(struct xfs_mount *mp);
58
59static int xfs_dir_isempty(struct xfs_inode *dp);
60
61static int xfs_dir_init(struct xfs_trans *trans,
62 struct xfs_inode *dir,
63 struct xfs_inode *parent_dir);
64
65static int xfs_dir_createname(struct xfs_trans *trans,
66 struct xfs_inode *dp,
67 char *name_string,
68 int name_len,
69 xfs_ino_t inode_number,
70 xfs_fsblock_t *firstblock,
71 xfs_bmap_free_t *flist,
72 xfs_extlen_t total);
73
74static int xfs_dir_lookup(struct xfs_trans *tp,
75 struct xfs_inode *dp,
76 char *name_string,
77 int name_length,
78 xfs_ino_t *inode_number);
79
80static int xfs_dir_removename(struct xfs_trans *trans,
81 struct xfs_inode *dp,
82 char *name_string,
83 int name_length,
84 xfs_ino_t ino,
85 xfs_fsblock_t *firstblock,
86 xfs_bmap_free_t *flist,
87 xfs_extlen_t total);
88
89static int xfs_dir_getdents(struct xfs_trans *tp,
90 struct xfs_inode *dp,
91 struct uio *uiop,
92 int *eofp);
93
94static int xfs_dir_replace(struct xfs_trans *tp,
95 struct xfs_inode *dp,
96 char *name_string,
97 int name_length,
98 xfs_ino_t inode_number,
99 xfs_fsblock_t *firstblock,
100 xfs_bmap_free_t *flist,
101 xfs_extlen_t total);
102
103static int xfs_dir_canenter(struct xfs_trans *tp,
104 struct xfs_inode *dp,
105 char *name_string,
106 int name_length);
107
108static int xfs_dir_shortform_validate_ondisk(xfs_mount_t *mp,
109 xfs_dinode_t *dip);
110
111xfs_dirops_t xfsv1_dirops = {
112 .xd_mount = xfs_dir_mount,
113 .xd_isempty = xfs_dir_isempty,
114 .xd_init = xfs_dir_init,
115 .xd_createname = xfs_dir_createname,
116 .xd_lookup = xfs_dir_lookup,
117 .xd_removename = xfs_dir_removename,
118 .xd_getdents = xfs_dir_getdents,
119 .xd_replace = xfs_dir_replace,
120 .xd_canenter = xfs_dir_canenter,
121 .xd_shortform_validate_ondisk = xfs_dir_shortform_validate_ondisk,
122 .xd_shortform_to_single = xfs_dir_shortform_to_leaf,
123};
124
125/*
126 * Internal routines when dirsize == XFS_LBSIZE(mp).
127 */
128STATIC int xfs_dir_leaf_lookup(xfs_da_args_t *args);
129STATIC int xfs_dir_leaf_removename(xfs_da_args_t *args, int *number_entries,
130 int *total_namebytes);
131STATIC int xfs_dir_leaf_getdents(xfs_trans_t *trans, xfs_inode_t *dp,
132 uio_t *uio, int *eofp,
133 xfs_dirent_t *dbp,
134 xfs_dir_put_t put);
135STATIC int xfs_dir_leaf_replace(xfs_da_args_t *args);
136
137/*
138 * Internal routines when dirsize > XFS_LBSIZE(mp).
139 */
140STATIC int xfs_dir_node_addname(xfs_da_args_t *args);
141STATIC int xfs_dir_node_lookup(xfs_da_args_t *args);
142STATIC int xfs_dir_node_removename(xfs_da_args_t *args);
143STATIC int xfs_dir_node_getdents(xfs_trans_t *trans, xfs_inode_t *dp,
144 uio_t *uio, int *eofp,
145 xfs_dirent_t *dbp,
146 xfs_dir_put_t put);
147STATIC int xfs_dir_node_replace(xfs_da_args_t *args);
148
149#if defined(XFS_DIR_TRACE)
150ktrace_t *xfs_dir_trace_buf;
151#endif
152
153
154/*========================================================================
155 * Overall external interface routines.
156 *========================================================================*/
157
158xfs_dahash_t xfs_dir_hash_dot, xfs_dir_hash_dotdot;
159
160/*
161 * One-time startup routine called from xfs_init().
162 */
163void
164xfs_dir_startup(void)
165{
166 xfs_dir_hash_dot = xfs_da_hashname(".", 1);
167 xfs_dir_hash_dotdot = xfs_da_hashname("..", 2);
168}
169
170/*
171 * Initialize directory-related fields in the mount structure.
172 */
173static void
174xfs_dir_mount(xfs_mount_t *mp)
175{
176 uint shortcount, leafcount, count;
177
178 mp->m_dirversion = 1;
13059ff0 179 if (!(mp->m_flags & XFS_MOUNT_ATTR2)) {
d8cc890d
NS		 180 shortcount = (mp->m_attroffset -
181 (uint)sizeof(xfs_dir_sf_hdr_t)) /
182 (uint)sizeof(xfs_dir_sf_entry_t);
183 leafcount = (XFS_LBSIZE(mp) -
184 (uint)sizeof(xfs_dir_leaf_hdr_t)) /
185 ((uint)sizeof(xfs_dir_leaf_entry_t) +
186 (uint)sizeof(xfs_dir_leaf_name_t));
187 } else {
188 shortcount = (XFS_BMDR_SPACE_CALC(MINABTPTRS) -
189 (uint)sizeof(xfs_dir_sf_hdr_t)) /
190 (uint)sizeof(xfs_dir_sf_entry_t);
191 leafcount = (XFS_LBSIZE(mp) -
192 (uint)sizeof(xfs_dir_leaf_hdr_t)) /
193 ((uint)sizeof(xfs_dir_leaf_entry_t) +
194 (uint)sizeof(xfs_dir_leaf_name_t));
195 }
1da177e4
LT		 196 count = shortcount > leafcount ? shortcount : leafcount;
197 mp->m_dircook_elog = xfs_da_log2_roundup(count + 1);
198 ASSERT(mp->m_dircook_elog <= mp->m_sb.sb_blocklog);
199 mp->m_dir_node_ents = mp->m_attr_node_ents =
200 (XFS_LBSIZE(mp) - (uint)sizeof(xfs_da_node_hdr_t)) /
201 (uint)sizeof(xfs_da_node_entry_t);
202 mp->m_dir_magicpct = (XFS_LBSIZE(mp) * 37) / 100;
203 mp->m_dirblksize = mp->m_sb.sb_blocksize;
204 mp->m_dirblkfsbs = 1;
205}
206
207/*
208 * Return 1 if directory contains only "." and "..".
209 */
210static int
211xfs_dir_isempty(xfs_inode_t *dp)
212{
213 xfs_dir_sf_hdr_t *hdr;
214
215 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
216 if (dp->i_d.di_size == 0)
217 return(1);
218 if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
219 return(0);
220 hdr = (xfs_dir_sf_hdr_t *)dp->i_df.if_u1.if_data;
221 return(hdr->count == 0);
222}
223
224/*
225 * Initialize a directory with its "." and ".." entries.
226 */
227static int
228xfs_dir_init(xfs_trans_t *trans, xfs_inode_t *dir, xfs_inode_t *parent_dir)
229{
230 xfs_da_args_t args;
231 int error;
232
233 memset((char *)&args, 0, sizeof(args));
234 args.dp = dir;
235 args.trans = trans;
236
237 ASSERT((dir->i_d.di_mode & S_IFMT) == S_IFDIR);
238 if ((error = xfs_dir_ino_validate(trans->t_mountp, parent_dir->i_ino)))
239 return error;
240
241 return(xfs_dir_shortform_create(&args, parent_dir->i_ino));
242}
243
244/*
245 * Generic handler routine to add a name to a directory.
246 * Transitions directory from shortform to Btree as necessary.
247 */
248static int /* error */
249xfs_dir_createname(xfs_trans_t *trans, xfs_inode_t *dp, char *name,
250 int namelen, xfs_ino_t inum, xfs_fsblock_t *firstblock,
251 xfs_bmap_free_t *flist, xfs_extlen_t total)
252{
253 xfs_da_args_t args;
254 int retval, newsize, done;
255
256 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
257
258 if ((retval = xfs_dir_ino_validate(trans->t_mountp, inum)))
259 return (retval);
260
261 XFS_STATS_INC(xs_dir_create);
262 /*
263 * Fill in the arg structure for this request.
264 */
265 args.name = name;
266 args.namelen = namelen;
267 args.hashval = xfs_da_hashname(name, namelen);
268 args.inumber = inum;
269 args.dp = dp;
270 args.firstblock = firstblock;
271 args.flist = flist;
272 args.total = total;
273 args.whichfork = XFS_DATA_FORK;
274 args.trans = trans;
275 args.justcheck = 0;
276 args.addname = args.oknoent = 1;
277
278 /*
279 * Decide on what work routines to call based on the inode size.
280 */
281 done = 0;
282 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
283 newsize = XFS_DIR_SF_ENTSIZE_BYNAME(args.namelen);
284 if ((dp->i_d.di_size + newsize) <= XFS_IFORK_DSIZE(dp)) {
285 retval = xfs_dir_shortform_addname(&args);
286 done = 1;
287 } else {
288 if (total == 0)
289 return XFS_ERROR(ENOSPC);
290 retval = xfs_dir_shortform_to_leaf(&args);
291 done = retval != 0;
292 }
293 }
294 if (!done && xfs_bmap_one_block(dp, XFS_DATA_FORK)) {
295 retval = xfs_dir_leaf_addname(&args);
296 done = retval != ENOSPC;
297 if (!done) {
298 if (total == 0)
299 return XFS_ERROR(ENOSPC);
300 retval = xfs_dir_leaf_to_node(&args);
301 done = retval != 0;
302 }
303 }
304 if (!done) {
305 retval = xfs_dir_node_addname(&args);
306 }
307 return(retval);
308}
309
310/*
311 * Generic handler routine to check if a name can be added to a directory,
312 * without adding any blocks to the directory.
313 */
314static int /* error */
315xfs_dir_canenter(xfs_trans_t *trans, xfs_inode_t *dp, char *name, int namelen)
316{
317 xfs_da_args_t args;
318 int retval, newsize;
319
320 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
321 /*
322 * Fill in the arg structure for this request.
323 */
324 args.name = name;
325 args.namelen = namelen;
326 args.hashval = xfs_da_hashname(name, namelen);
327 args.inumber = 0;
328 args.dp = dp;
329 args.firstblock = NULL;
330 args.flist = NULL;
331 args.total = 0;
332 args.whichfork = XFS_DATA_FORK;
333 args.trans = trans;
334 args.justcheck = args.addname = args.oknoent = 1;
335
336 /*
337 * Decide on what work routines to call based on the inode size.
338 */
339 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
340 newsize = XFS_DIR_SF_ENTSIZE_BYNAME(args.namelen);
341 if ((dp->i_d.di_size + newsize) <= XFS_IFORK_DSIZE(dp))
342 retval = 0;
343 else
344 retval = XFS_ERROR(ENOSPC);
345 } else if (xfs_bmap_one_block(dp, XFS_DATA_FORK)) {
346 retval = xfs_dir_leaf_addname(&args);
347 } else {
348 retval = xfs_dir_node_addname(&args);
349 }
350 return(retval);
351}
352
353/*
354 * Generic handler routine to remove a name from a directory.
355 * Transitions directory from Btree to shortform as necessary.
356 */
357static int /* error */
358xfs_dir_removename(xfs_trans_t *trans, xfs_inode_t *dp, char *name,
359 int namelen, xfs_ino_t ino, xfs_fsblock_t *firstblock,
360 xfs_bmap_free_t *flist, xfs_extlen_t total)
361{
362 xfs_da_args_t args;
363 int count, totallen, newsize, retval;
364
365 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
366 XFS_STATS_INC(xs_dir_remove);
367 /*
368 * Fill in the arg structure for this request.
369 */
370 args.name = name;
371 args.namelen = namelen;
372 args.hashval = xfs_da_hashname(name, namelen);
373 args.inumber = ino;
374 args.dp = dp;
375 args.firstblock = firstblock;
376 args.flist = flist;
377 args.total = total;
378 args.whichfork = XFS_DATA_FORK;
379 args.trans = trans;
380 args.justcheck = args.addname = args.oknoent = 0;
381
382 /*
383 * Decide on what work routines to call based on the inode size.
384 */
385 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
386 retval = xfs_dir_shortform_removename(&args);
387 } else if (xfs_bmap_one_block(dp, XFS_DATA_FORK)) {
388 retval = xfs_dir_leaf_removename(&args, &count, &totallen);
389 if (retval == 0) {
390 newsize = XFS_DIR_SF_ALLFIT(count, totallen);
391 if (newsize <= XFS_IFORK_DSIZE(dp)) {
392 retval = xfs_dir_leaf_to_shortform(&args);
393 }
394 }
395 } else {
396 retval = xfs_dir_node_removename(&args);
397 }
398 return(retval);
399}
400
401static int /* error */
402xfs_dir_lookup(xfs_trans_t *trans, xfs_inode_t *dp, char *name, int namelen,
403 xfs_ino_t *inum)
404{
405 xfs_da_args_t args;
406 int retval;
407
408 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
409
410 XFS_STATS_INC(xs_dir_lookup);
411 /*
412 * Fill in the arg structure for this request.
413 */
414 args.name = name;
415 args.namelen = namelen;
416 args.hashval = xfs_da_hashname(name, namelen);
417 args.inumber = 0;
418 args.dp = dp;
419 args.firstblock = NULL;
420 args.flist = NULL;
421 args.total = 0;
422 args.whichfork = XFS_DATA_FORK;
423 args.trans = trans;
424 args.justcheck = args.addname = 0;
425 args.oknoent = 1;
426
427 /*
428 * Decide on what work routines to call based on the inode size.
429 */
430 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
431 retval = xfs_dir_shortform_lookup(&args);
432 } else if (xfs_bmap_one_block(dp, XFS_DATA_FORK)) {
433 retval = xfs_dir_leaf_lookup(&args);
434 } else {
435 retval = xfs_dir_node_lookup(&args);
436 }
437 if (retval == EEXIST)
438 retval = 0;
439 *inum = args.inumber;
440 return(retval);
441}
442
443/*
444 * Implement readdir.
445 */
446static int /* error */
447xfs_dir_getdents(xfs_trans_t *trans, xfs_inode_t *dp, uio_t *uio, int *eofp)
448{
449 xfs_dirent_t *dbp;
450 int alignment, retval;
451 xfs_dir_put_t put;
452
453 XFS_STATS_INC(xs_dir_getdents);
454 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
455
456 /*
457 * If our caller has given us a single contiguous memory buffer,
458 * just work directly within that buffer. If it's in user memory,
459 * lock it down first.
460 */
461 alignment = sizeof(xfs_off_t) - 1;
462 if ((uio->uio_iovcnt == 1) &&
463 (((__psint_t)uio->uio_iov[0].iov_base & alignment) == 0) &&
464 ((uio->uio_iov[0].iov_len & alignment) == 0)) {
465 dbp = NULL;
466 put = xfs_dir_put_dirent64_direct;
467 } else {
468 dbp = kmem_alloc(sizeof(*dbp) + MAXNAMELEN, KM_SLEEP);
469 put = xfs_dir_put_dirent64_uio;
470 }
471
472 /*
473 * Decide on what work routines to call based on the inode size.
474 */
475 *eofp = 0;
476
477 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
478 retval = xfs_dir_shortform_getdents(dp, uio, eofp, dbp, put);
479 } else if (xfs_bmap_one_block(dp, XFS_DATA_FORK)) {
480 retval = xfs_dir_leaf_getdents(trans, dp, uio, eofp, dbp, put);
481 } else {
482 retval = xfs_dir_node_getdents(trans, dp, uio, eofp, dbp, put);
483 }
484 if (dbp != NULL)
485 kmem_free(dbp, sizeof(*dbp) + MAXNAMELEN);
486
487 return(retval);
488}
489
490static int /* error */
491xfs_dir_replace(xfs_trans_t *trans, xfs_inode_t *dp, char *name, int namelen,
492 xfs_ino_t inum, xfs_fsblock_t *firstblock,
493 xfs_bmap_free_t *flist, xfs_extlen_t total)
494{
495 xfs_da_args_t args;
496 int retval;
497
498 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
499
500 if ((retval = xfs_dir_ino_validate(trans->t_mountp, inum)))
501 return retval;
502
503 /*
504 * Fill in the arg structure for this request.
505 */
506 args.name = name;
507 args.namelen = namelen;
508 args.hashval = xfs_da_hashname(name, namelen);
509 args.inumber = inum;
510 args.dp = dp;
511 args.firstblock = firstblock;
512 args.flist = flist;
513 args.total = total;
514 args.whichfork = XFS_DATA_FORK;
515 args.trans = trans;
516 args.justcheck = args.addname = args.oknoent = 0;
517
518 /*
519 * Decide on what work routines to call based on the inode size.
520 */
521 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
522 retval = xfs_dir_shortform_replace(&args);
523 } else if (xfs_bmap_one_block(dp, XFS_DATA_FORK)) {
524 retval = xfs_dir_leaf_replace(&args);
525 } else {
526 retval = xfs_dir_node_replace(&args);
527 }
528
529 return(retval);
530}
531
532static int
533xfs_dir_shortform_validate_ondisk(xfs_mount_t *mp, xfs_dinode_t *dp)
534{
535 xfs_ino_t ino;
536 int namelen_sum;
537 int count;
538 xfs_dir_shortform_t *sf;
539 xfs_dir_sf_entry_t *sfe;
540 int i;
541
542
543
544 if ((INT_GET(dp->di_core.di_mode, ARCH_CONVERT) & S_IFMT) != S_IFDIR) {
545 return 0;
546 }
547 if (INT_GET(dp->di_core.di_format, ARCH_CONVERT) != XFS_DINODE_FMT_LOCAL) {
548 return 0;
549 }
550 if (INT_GET(dp->di_core.di_size, ARCH_CONVERT) < sizeof(sf->hdr)) {
551 xfs_fs_cmn_err(CE_WARN, mp, "Invalid shortform size: dp 0x%p",
552 dp);
553 return 1;
554 }
555 sf = (xfs_dir_shortform_t *)(&dp->di_u.di_dirsf);
556 ino = XFS_GET_DIR_INO8(sf->hdr.parent);
557 if (xfs_dir_ino_validate(mp, ino))
558 return 1;
559
560 count = sf->hdr.count;
561 if ((count < 0) || ((count * 10) > XFS_LITINO(mp))) {
562 xfs_fs_cmn_err(CE_WARN, mp,
563 "Invalid shortform count: dp 0x%p", dp);
564 return(1);
565 }
566
567 if (count == 0) {
568 return 0;
569 }
570
571 namelen_sum = 0;
572 sfe = &sf->list[0];
573 for (i = sf->hdr.count - 1; i >= 0; i--) {
574 ino = XFS_GET_DIR_INO8(sfe->inumber);
575 xfs_dir_ino_validate(mp, ino);
576 if (sfe->namelen >= XFS_LITINO(mp)) {
577 xfs_fs_cmn_err(CE_WARN, mp,
578 "Invalid shortform namelen: dp 0x%p", dp);
579 return 1;
580 }
581 namelen_sum += sfe->namelen;
582 sfe = XFS_DIR_SF_NEXTENTRY(sfe);
583 }
584 if (namelen_sum >= XFS_LITINO(mp)) {
585 xfs_fs_cmn_err(CE_WARN, mp,
586 "Invalid shortform namelen: dp 0x%p", dp);
587 return 1;
588 }
589
590 return 0;
591}
592
593/*========================================================================
594 * External routines when dirsize == XFS_LBSIZE(dp->i_mount).
595 *========================================================================*/
596
597/*
598 * Add a name to the leaf directory structure
599 * This is the external routine.
600 */
601int
602xfs_dir_leaf_addname(xfs_da_args_t *args)
603{
604 int index, retval;
605 xfs_dabuf_t *bp;
606
607 retval = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp,
608 XFS_DATA_FORK);
609 if (retval)
610 return(retval);
611 ASSERT(bp != NULL);
612
613 retval = xfs_dir_leaf_lookup_int(bp, args, &index);
614 if (retval == ENOENT)
615 retval = xfs_dir_leaf_add(bp, args, index);
616 xfs_da_buf_done(bp);
617 return(retval);
618}
619
620/*
621 * Remove a name from the leaf directory structure
622 * This is the external routine.
623 */
624STATIC int
625xfs_dir_leaf_removename(xfs_da_args_t *args, int *count, int *totallen)
626{
627 xfs_dir_leafblock_t *leaf;
628 int index, retval;
629 xfs_dabuf_t *bp;
630
631 retval = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp,
632 XFS_DATA_FORK);
633 if (retval)
634 return(retval);
635 ASSERT(bp != NULL);
636 leaf = bp->data;
89da0544 637 ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_DIR_LEAF_MAGIC);
1da177e4
LT		 638 retval = xfs_dir_leaf_lookup_int(bp, args, &index);
639 if (retval == EEXIST) {
640 (void)xfs_dir_leaf_remove(args->trans, bp, index);
8034fff3
CH		 641 *count = be16_to_cpu(leaf->hdr.count);
642 *totallen = be16_to_cpu(leaf->hdr.namebytes);
1da177e4
LT		 643 retval = 0;
644 }
645 xfs_da_buf_done(bp);
646 return(retval);
647}
648
649/*
650 * Look up a name in a leaf directory structure.
651 * This is the external routine.
652 */
653STATIC int
654xfs_dir_leaf_lookup(xfs_da_args_t *args)
655{
656 int index, retval;
657 xfs_dabuf_t *bp;
658
659 retval = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp,
660 XFS_DATA_FORK);
661 if (retval)
662 return(retval);
663 ASSERT(bp != NULL);
664 retval = xfs_dir_leaf_lookup_int(bp, args, &index);
665 xfs_da_brelse(args->trans, bp);
666 return(retval);
667}
668
669/*
670 * Copy out directory entries for getdents(), for leaf directories.
671 */
672STATIC int
673xfs_dir_leaf_getdents(xfs_trans_t *trans, xfs_inode_t *dp, uio_t *uio,
674 int *eofp, xfs_dirent_t *dbp, xfs_dir_put_t put)
675{
676 xfs_dabuf_t *bp;
677 int retval, eob;
678
679 retval = xfs_da_read_buf(dp->i_transp, dp, 0, -1, &bp, XFS_DATA_FORK);
680 if (retval)
681 return(retval);
682 ASSERT(bp != NULL);
683 retval = xfs_dir_leaf_getdents_int(bp, dp, 0, uio, &eob, dbp, put, -1);
684 xfs_da_brelse(trans, bp);
685 *eofp = (eob == 0);
686 return(retval);
687}
688
689/*
690 * Look up a name in a leaf directory structure, replace the inode number.
691 * This is the external routine.
692 */
693STATIC int
694xfs_dir_leaf_replace(xfs_da_args_t *args)
695{
696 int index, retval;
697 xfs_dabuf_t *bp;
698 xfs_ino_t inum;
699 xfs_dir_leafblock_t *leaf;
700 xfs_dir_leaf_entry_t *entry;
701 xfs_dir_leaf_name_t *namest;
702
703 inum = args->inumber;
704 retval = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp,
705 XFS_DATA_FORK);
706 if (retval)
707 return(retval);
708 ASSERT(bp != NULL);
709 retval = xfs_dir_leaf_lookup_int(bp, args, &index);
710 if (retval == EEXIST) {
711 leaf = bp->data;
712 entry = &leaf->entries[index];
1d8daf06 713 namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, be16_to_cpu(entry->nameidx));
1da177e4
LT		 714 /* XXX - replace assert? */
715 XFS_DIR_SF_PUT_DIRINO(&inum, &namest->inumber);
716 xfs_da_log_buf(args->trans, bp,
717 XFS_DA_LOGRANGE(leaf, namest, sizeof(namest->inumber)));
718 xfs_da_buf_done(bp);
719 retval = 0;
720 } else
721 xfs_da_brelse(args->trans, bp);
722 return(retval);
723}
724
725
726/*========================================================================
727 * External routines when dirsize > XFS_LBSIZE(mp).
728 *========================================================================*/
729
730/*
731 * Add a name to a Btree-format directory.
732 *
733 * This will involve walking down the Btree, and may involve splitting
734 * leaf nodes and even splitting intermediate nodes up to and including
735 * the root node (a special case of an intermediate node).
736 */
737STATIC int
738xfs_dir_node_addname(xfs_da_args_t *args)
739{
740 xfs_da_state_t *state;
741 xfs_da_state_blk_t *blk;
742 int retval, error;
743
744 /*
745 * Fill in bucket of arguments/results/context to carry around.
746 */
747 state = xfs_da_state_alloc();
748 state->args = args;
749 state->mp = args->dp->i_mount;
750 state->blocksize = state->mp->m_sb.sb_blocksize;
751 state->node_ents = state->mp->m_dir_node_ents;
752
753 /*
754 * Search to see if name already exists, and get back a pointer
755 * to where it should go.
756 */
757 error = xfs_da_node_lookup_int(state, &retval);
758 if (error)
759 retval = error;
760 if (retval != ENOENT)
761 goto error;
762 blk = &state->path.blk[ state->path.active-1 ];
763 ASSERT(blk->magic == XFS_DIR_LEAF_MAGIC);
764 retval = xfs_dir_leaf_add(blk->bp, args, blk->index);
765 if (retval == 0) {
766 /*
767 * Addition succeeded, update Btree hashvals.
768 */
769 if (!args->justcheck)
770 xfs_da_fixhashpath(state, &state->path);
771 } else {
772 /*
773 * Addition failed, split as many Btree elements as required.
774 */
775 if (args->total == 0) {
776 ASSERT(retval == ENOSPC);
777 goto error;
778 }
779 retval = xfs_da_split(state);
780 }
781error:
782 xfs_da_state_free(state);
783
784 return(retval);
785}
786
787/*
788 * Remove a name from a B-tree directory.
789 *
790 * This will involve walking down the Btree, and may involve joining
791 * leaf nodes and even joining intermediate nodes up to and including
792 * the root node (a special case of an intermediate node).
793 */
794STATIC int
795xfs_dir_node_removename(xfs_da_args_t *args)
796{
797 xfs_da_state_t *state;
798 xfs_da_state_blk_t *blk;
799 int retval, error;
800
801 state = xfs_da_state_alloc();
802 state->args = args;
803 state->mp = args->dp->i_mount;
804 state->blocksize = state->mp->m_sb.sb_blocksize;
805 state->node_ents = state->mp->m_dir_node_ents;
806
807 /*
808 * Search to see if name exists, and get back a pointer to it.
809 */
810 error = xfs_da_node_lookup_int(state, &retval);
811 if (error)
812 retval = error;
813 if (retval != EEXIST) {
814 xfs_da_state_free(state);
815 return(retval);
816 }
817
818 /*
819 * Remove the name and update the hashvals in the tree.
820 */
821 blk = &state->path.blk[ state->path.active-1 ];
822 ASSERT(blk->magic == XFS_DIR_LEAF_MAGIC);
823 retval = xfs_dir_leaf_remove(args->trans, blk->bp, blk->index);
824 xfs_da_fixhashpath(state, &state->path);
825
826 /*
827 * Check to see if the tree needs to be collapsed.
828 */
829 error = 0;
830 if (retval) {
831 error = xfs_da_join(state);
832 }
833
834 xfs_da_state_free(state);
835 if (error)
836 return(error);
837 return(0);
838}
839
840/*
841 * Look up a filename in a int directory.
842 * Use an internal routine to actually do all the work.
843 */
844STATIC int
845xfs_dir_node_lookup(xfs_da_args_t *args)
846{
847 xfs_da_state_t *state;
848 int retval, error, i;
849
850 state = xfs_da_state_alloc();
851 state->args = args;
852 state->mp = args->dp->i_mount;
853 state->blocksize = state->mp->m_sb.sb_blocksize;
854 state->node_ents = state->mp->m_dir_node_ents;
855
856 /*
857 * Search to see if name exists,
858 * and get back a pointer to it.
859 */
860 error = xfs_da_node_lookup_int(state, &retval);
861 if (error) {
862 retval = error;
863 }
864
865 /*
866 * If not in a transaction, we have to release all the buffers.
867 */
868 for (i = 0; i < state->path.active; i++) {
869 xfs_da_brelse(args->trans, state->path.blk[i].bp);
870 state->path.blk[i].bp = NULL;
871 }
872
873 xfs_da_state_free(state);
874 return(retval);
875}
876
877STATIC int
878xfs_dir_node_getdents(xfs_trans_t *trans, xfs_inode_t *dp, uio_t *uio,
879 int *eofp, xfs_dirent_t *dbp, xfs_dir_put_t put)
880{
881 xfs_da_intnode_t *node;
882 xfs_da_node_entry_t *btree;
883 xfs_dir_leafblock_t *leaf = NULL;
884 xfs_dablk_t bno, nextbno;
885 xfs_dahash_t cookhash;
886 xfs_mount_t *mp;
887 int error, eob, i;
888 xfs_dabuf_t *bp;
889 xfs_daddr_t nextda;
890
891 /*
892 * Pick up our context.
893 */
894 mp = dp->i_mount;
895 bp = NULL;
896 bno = XFS_DA_COOKIE_BNO(mp, uio->uio_offset);
897 cookhash = XFS_DA_COOKIE_HASH(mp, uio->uio_offset);
898
899 xfs_dir_trace_g_du("node: start", dp, uio);
900
901 /*
902 * Re-find our place, even if we're confused about what our place is.
903 *
904 * First we check the block number from the magic cookie, it is a
905 * cache of where we ended last time. If we find a leaf block, and
906 * the starting hashval in that block is less than our desired
907 * hashval, then we run with it.
908 */
909 if (bno > 0) {
910 error = xfs_da_read_buf(trans, dp, bno, -2, &bp, XFS_DATA_FORK);
911 if ((error != 0) && (error != EFSCORRUPTED))
912 return(error);
913 if (bp)
914 leaf = bp->data;
89da0544 915 if (bp && be16_to_cpu(leaf->hdr.info.magic) != XFS_DIR_LEAF_MAGIC) {
1da177e4
LT		 916 xfs_dir_trace_g_dub("node: block not a leaf",
917 dp, uio, bno);
918 xfs_da_brelse(trans, bp);
919 bp = NULL;
920 }
1d8daf06 921 if (bp && be32_to_cpu(leaf->entries[0].hashval) > cookhash) {
1da177e4
LT		 922 xfs_dir_trace_g_dub("node: leaf hash too large",
923 dp, uio, bno);
924 xfs_da_brelse(trans, bp);
925 bp = NULL;
926 }
1d8daf06
CH		 927 if (bp && cookhash > be32_to_cpu(leaf->entries[
928 be16_to_cpu(leaf->hdr.count) - 1].hashval)) {
1da177e4
LT		 929 xfs_dir_trace_g_dub("node: leaf hash too small",
930 dp, uio, bno);
931 xfs_da_brelse(trans, bp);
932 bp = NULL;
933 }
934 }
935
936 /*
937 * If we did not find a leaf block from the blockno in the cookie,
938 * or we there was no blockno in the cookie (eg: first time thru),
939 * the we start at the top of the Btree and re-find our hashval.
940 */
941 if (bp == NULL) {
942 xfs_dir_trace_g_du("node: start at root" , dp, uio);
943 bno = 0;
944 for (;;) {
945 error = xfs_da_read_buf(trans, dp, bno, -1, &bp,
946 XFS_DATA_FORK);
947 if (error)
948 return(error);
949 if (bp == NULL)
950 return(XFS_ERROR(EFSCORRUPTED));
951 node = bp->data;
89da0544 952 if (be16_to_cpu(node->hdr.info.magic) != XFS_DA_NODE_MAGIC)
1da177e4
LT		 953 break;
954 btree = &node->btree[0];
955 xfs_dir_trace_g_dun("node: node detail", dp, uio, node);
fac80cce 956 for (i = 0; i < be16_to_cpu(node->hdr.count); btree++, i++) {
403432dc
NS		 957 if (be32_to_cpu(btree->hashval) >= cookhash) {
958 bno = be32_to_cpu(btree->before);
1da177e4
LT		 959 break;
960 }
961 }
fac80cce 962 if (i == be16_to_cpu(node->hdr.count)) {
1da177e4
LT		 963 xfs_da_brelse(trans, bp);
964 xfs_dir_trace_g_du("node: hash beyond EOF",
965 dp, uio);
966 uio->uio_offset = XFS_DA_MAKE_COOKIE(mp, 0, 0,
967 XFS_DA_MAXHASH);
968 *eofp = 1;
969 return(0);
970 }
971 xfs_dir_trace_g_dub("node: going to block",
972 dp, uio, bno);
973 xfs_da_brelse(trans, bp);
974 }
975 }
976 ASSERT(cookhash != XFS_DA_MAXHASH);
977
978 /*
979 * We've dropped down to the (first) leaf block that contains the
980 * hashval we are interested in. Continue rolling upward thru the
981 * leaf blocks until we fill up our buffer.
982 */
983 for (;;) {
984 leaf = bp->data;
89da0544 985 if (unlikely(be16_to_cpu(leaf->hdr.info.magic) != XFS_DIR_LEAF_MAGIC)) {
1da177e4
LT		 986 xfs_dir_trace_g_dul("node: not a leaf", dp, uio, leaf);
987 xfs_da_brelse(trans, bp);
988 XFS_CORRUPTION_ERROR("xfs_dir_node_getdents(1)",
989 XFS_ERRLEVEL_LOW, mp, leaf);
990 return XFS_ERROR(EFSCORRUPTED);
991 }
992 xfs_dir_trace_g_dul("node: leaf detail", dp, uio, leaf);
89da0544 993 if ((nextbno = be32_to_cpu(leaf->hdr.info.forw))) {
1da177e4
LT		 994 nextda = xfs_da_reada_buf(trans, dp, nextbno,
995 XFS_DATA_FORK);
996 } else
997 nextda = -1;
998 error = xfs_dir_leaf_getdents_int(bp, dp, bno, uio, &eob, dbp,
999 put, nextda);
1000 xfs_da_brelse(trans, bp);
1001 bno = nextbno;
1002 if (eob) {
1003 xfs_dir_trace_g_dub("node: E-O-B", dp, uio, bno);
1004 *eofp = 0;
1005 return(error);
1006 }
1007 if (bno == 0)
1008 break;
1009 error = xfs_da_read_buf(trans, dp, bno, nextda, &bp,
1010 XFS_DATA_FORK);
1011 if (error)
1012 return(error);
1013 if (unlikely(bp == NULL)) {
1014 XFS_ERROR_REPORT("xfs_dir_node_getdents(2)",
1015 XFS_ERRLEVEL_LOW, mp);
1016 return(XFS_ERROR(EFSCORRUPTED));
1017 }
1018 }
1019 *eofp = 1;
1020 xfs_dir_trace_g_du("node: E-O-F", dp, uio);
1021 return(0);
1022}
1023
1024/*
1025 * Look up a filename in an int directory, replace the inode number.
1026 * Use an internal routine to actually do the lookup.
1027 */
1028STATIC int
1029xfs_dir_node_replace(xfs_da_args_t *args)
1030{
1031 xfs_da_state_t *state;
1032 xfs_da_state_blk_t *blk;
1033 xfs_dir_leafblock_t *leaf;
1034 xfs_dir_leaf_entry_t *entry;
1035 xfs_dir_leaf_name_t *namest;
1036 xfs_ino_t inum;
1037 int retval, error, i;
1038 xfs_dabuf_t *bp;
1039
1040 state = xfs_da_state_alloc();
1041 state->args = args;
1042 state->mp = args->dp->i_mount;
1043 state->blocksize = state->mp->m_sb.sb_blocksize;
1044 state->node_ents = state->mp->m_dir_node_ents;
1045 inum = args->inumber;
1046
1047 /*
1048 * Search to see if name exists,
1049 * and get back a pointer to it.
1050 */
1051 error = xfs_da_node_lookup_int(state, &retval);
1052 if (error) {
1053 retval = error;
1054 }
1055
1056 if (retval == EEXIST) {
1057 blk = &state->path.blk[state->path.active - 1];
1058 ASSERT(blk->magic == XFS_DIR_LEAF_MAGIC);
1059 bp = blk->bp;
1060 leaf = bp->data;
1061 entry = &leaf->entries[blk->index];
1d8daf06 1062 namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, be16_to_cpu(entry->nameidx));
1da177e4
LT		 1063 /* XXX - replace assert ? */
1064 XFS_DIR_SF_PUT_DIRINO(&inum, &namest->inumber);
1065 xfs_da_log_buf(args->trans, bp,
1066 XFS_DA_LOGRANGE(leaf, namest, sizeof(namest->inumber)));
1067 xfs_da_buf_done(bp);
1068 blk->bp = NULL;
1069 retval = 0;
1070 } else {
1071 i = state->path.active - 1;
1072 xfs_da_brelse(args->trans, state->path.blk[i].bp);
1073 state->path.blk[i].bp = NULL;
1074 }
1075 for (i = 0; i < state->path.active - 1; i++) {
1076 xfs_da_brelse(args->trans, state->path.blk[i].bp);
1077 state->path.blk[i].bp = NULL;
1078 }
1079
1080 xfs_da_state_free(state);
1081 return(retval);
1082}
1083
1084#if defined(XFS_DIR_TRACE)
1085/*
1086 * Add a trace buffer entry for an inode and a uio.
1087 */
1088void
1089xfs_dir_trace_g_du(char *where, xfs_inode_t *dp, uio_t *uio)
1090{
1091 xfs_dir_trace_enter(XFS_DIR_KTRACE_G_DU, where,
1092 (void *)dp, (void *)dp->i_mount,
1093 (void *)((unsigned long)(uio->uio_offset >> 32)),
1094 (void *)((unsigned long)(uio->uio_offset & 0xFFFFFFFF)),
1095 (void *)(unsigned long)uio->uio_resid,
1096 NULL, NULL, NULL, NULL, NULL, NULL, NULL);
1097}
1098
1099/*
1100 * Add a trace buffer entry for an inode and a uio.
1101 */
1102void
1103xfs_dir_trace_g_dub(char *where, xfs_inode_t *dp, uio_t *uio, xfs_dablk_t bno)
1104{
1105 xfs_dir_trace_enter(XFS_DIR_KTRACE_G_DUB, where,
1106 (void *)dp, (void *)dp->i_mount,
1107 (void *)((unsigned long)(uio->uio_offset >> 32)),
1108 (void *)((unsigned long)(uio->uio_offset & 0xFFFFFFFF)),
1109 (void *)(unsigned long)uio->uio_resid,
1110 (void *)(unsigned long)bno,
1111 NULL, NULL, NULL, NULL, NULL, NULL);
1112}
1113
1114/*
1115 * Add a trace buffer entry for an inode and a uio.
1116 */
1117void
1118xfs_dir_trace_g_dun(char *where, xfs_inode_t *dp, uio_t *uio,
1119 xfs_da_intnode_t *node)
1120{
fac80cce 1121 int last = be16_to_cpu(node->hdr.count) - 1;
1da177e4
LT		 1122
1123 xfs_dir_trace_enter(XFS_DIR_KTRACE_G_DUN, where,
1124 (void *)dp, (void *)dp->i_mount,
1125 (void *)((unsigned long)(uio->uio_offset >> 32)),
1126 (void *)((unsigned long)(uio->uio_offset & 0xFFFFFFFF)),
1127 (void *)(unsigned long)uio->uio_resid,
89da0544 1128 (void *)(unsigned long)be32_to_cpu(node->hdr.info.forw),
1da177e4 1129 (void *)(unsigned long)
fac80cce 1130 be16_to_cpu(node->hdr.count),
1da177e4 1131 (void *)(unsigned long)
403432dc 1132 be32_to_cpu(node->btree[0].hashval),
1da177e4 1133 (void *)(unsigned long)
403432dc 1134 be32_to_cpu(node->btree[last].hashval),
1da177e4
LT		 1135 NULL, NULL, NULL);
1136}
1137
1138/*
1139 * Add a trace buffer entry for an inode and a uio.
1140 */
1141void
1142xfs_dir_trace_g_dul(char *where, xfs_inode_t *dp, uio_t *uio,
1143 xfs_dir_leafblock_t *leaf)
1144{
8034fff3 1145 int last = be16_to_cpu(leaf->hdr.count) - 1;
1da177e4
LT		 1146
1147 xfs_dir_trace_enter(XFS_DIR_KTRACE_G_DUL, where,
1148 (void *)dp, (void *)dp->i_mount,
1149 (void *)((unsigned long)(uio->uio_offset >> 32)),
1150 (void *)((unsigned long)(uio->uio_offset & 0xFFFFFFFF)),
1151 (void *)(unsigned long)uio->uio_resid,
89da0544 1152 (void *)(unsigned long)be32_to_cpu(leaf->hdr.info.forw),
8034fff3 1153 (void *)(unsigned long)be16_to_cpu(leaf->hdr.count),
1d8daf06
CH		 1154 (void *)(unsigned long)be32_to_cpu(leaf->entries[0].hashval),
1155 (void *)(unsigned long)be32_to_cpu(leaf->entries[last].hashval),
1da177e4
LT		 1156 NULL, NULL, NULL);
1157}
1158
1159/*
1160 * Add a trace buffer entry for an inode and a uio.
1161 */
1162void
1163xfs_dir_trace_g_due(char *where, xfs_inode_t *dp, uio_t *uio,
1164 xfs_dir_leaf_entry_t *entry)
1165{
1166 xfs_dir_trace_enter(XFS_DIR_KTRACE_G_DUE, where,
1167 (void *)dp, (void *)dp->i_mount,
1168 (void *)((unsigned long)(uio->uio_offset >> 32)),
1169 (void *)((unsigned long)(uio->uio_offset & 0xFFFFFFFF)),
1170 (void *)(unsigned long)uio->uio_resid,
1d8daf06 1171 (void *)(unsigned long)be32_to_cpu(entry->hashval),
1da177e4
LT		 1172 NULL, NULL, NULL, NULL, NULL, NULL);
1173}
1174
1175/*
1176 * Add a trace buffer entry for an inode and a uio.
1177 */
1178void
1179xfs_dir_trace_g_duc(char *where, xfs_inode_t *dp, uio_t *uio, xfs_off_t cookie)
1180{
1181 xfs_dir_trace_enter(XFS_DIR_KTRACE_G_DUC, where,
1182 (void *)dp, (void *)dp->i_mount,
1183 (void *)((unsigned long)(uio->uio_offset >> 32)),
1184 (void *)((unsigned long)(uio->uio_offset & 0xFFFFFFFF)),
1185 (void *)(unsigned long)uio->uio_resid,
1186 (void *)((unsigned long)(cookie >> 32)),
1187 (void *)((unsigned long)(cookie & 0xFFFFFFFF)),
1188 NULL, NULL, NULL, NULL, NULL);
1189}
1190
1191/*
1192 * Add a trace buffer entry for the arguments given to the routine,
1193 * generic form.
1194 */
1195void
1196xfs_dir_trace_enter(int type, char *where,
1197 void * a0, void * a1,
1198 void * a2, void * a3,
1199 void * a4, void * a5,
1200 void * a6, void * a7,
1201 void * a8, void * a9,
1202 void * a10, void * a11)
1203{
1204 ASSERT(xfs_dir_trace_buf);
1205 ktrace_enter(xfs_dir_trace_buf, (void *)(unsigned long)type,
1206 (void *)where,
1207 (void *)a0, (void *)a1, (void *)a2,
1208 (void *)a3, (void *)a4, (void *)a5,
1209 (void *)a6, (void *)a7, (void *)a8,
1210 (void *)a9, (void *)a10, (void *)a11,
1211 NULL, NULL);
1212}
1213#endif /* XFS_DIR_TRACE */
Linux 6.x block layer and io_uring tree(s)