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[PATCH] kobject: quiet errors in kobject_add
[linux-2.6/suspend2-2.6.18.git] / fs / xfs / xfs_attr.c
blobb6e1e02bbb285bd5bda5c090f4a85d6e6789494e
1 /*
2 * Copyright (c) 2000-2005 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
19 #include <linux/capability.h>
20
21 #include "xfs.h"
22 #include "xfs_fs.h"
23 #include "xfs_types.h"
24 #include "xfs_bit.h"
25 #include "xfs_log.h"
26 #include "xfs_inum.h"
27 #include "xfs_trans.h"
28 #include "xfs_sb.h"
29 #include "xfs_ag.h"
30 #include "xfs_dir.h"
31 #include "xfs_dir2.h"
32 #include "xfs_dmapi.h"
33 #include "xfs_mount.h"
34 #include "xfs_da_btree.h"
35 #include "xfs_bmap_btree.h"
36 #include "xfs_alloc_btree.h"
37 #include "xfs_ialloc_btree.h"
38 #include "xfs_dir_sf.h"
39 #include "xfs_dir2_sf.h"
40 #include "xfs_attr_sf.h"
41 #include "xfs_dinode.h"
42 #include "xfs_inode.h"
43 #include "xfs_alloc.h"
44 #include "xfs_btree.h"
45 #include "xfs_inode_item.h"
46 #include "xfs_bmap.h"
47 #include "xfs_attr.h"
48 #include "xfs_attr_leaf.h"
49 #include "xfs_error.h"
50 #include "xfs_quota.h"
51 #include "xfs_trans_space.h"
52 #include "xfs_acl.h"
53 #include "xfs_rw.h"
54
55 /*
56 * xfs_attr.c
57 *
58 * Provide the external interfaces to manage attribute lists.
59 */
60
61 #define ATTR_SYSCOUNT 2
62 STATIC struct attrnames posix_acl_access;
63 STATIC struct attrnames posix_acl_default;
64 STATIC struct attrnames *attr_system_names[ATTR_SYSCOUNT];
65
66 /*========================================================================
67 * Function prototypes for the kernel.
68 *========================================================================*/
69
70 /*
71 * Internal routines when attribute list fits inside the inode.
72 */
73 STATIC int xfs_attr_shortform_addname(xfs_da_args_t *args);
74
75 /*
76 * Internal routines when attribute list is one block.
77 */
78 STATIC int xfs_attr_leaf_get(xfs_da_args_t *args);
79 STATIC int xfs_attr_leaf_addname(xfs_da_args_t *args);
80 STATIC int xfs_attr_leaf_removename(xfs_da_args_t *args);
81 STATIC int xfs_attr_leaf_list(xfs_attr_list_context_t *context);
82
83 /*
84 * Internal routines when attribute list is more than one block.
85 */
86 STATIC int xfs_attr_node_get(xfs_da_args_t *args);
87 STATIC int xfs_attr_node_addname(xfs_da_args_t *args);
88 STATIC int xfs_attr_node_removename(xfs_da_args_t *args);
89 STATIC int xfs_attr_node_list(xfs_attr_list_context_t *context);
90 STATIC int xfs_attr_fillstate(xfs_da_state_t *state);
91 STATIC int xfs_attr_refillstate(xfs_da_state_t *state);
92
93 /*
94 * Routines to manipulate out-of-line attribute values.
95 */
96 STATIC int xfs_attr_rmtval_get(xfs_da_args_t *args);
97 STATIC int xfs_attr_rmtval_set(xfs_da_args_t *args);
98 STATIC int xfs_attr_rmtval_remove(xfs_da_args_t *args);
99
100 #define ATTR_RMTVALUE_MAPSIZE 1 /* # of map entries at once */
101
102 #if defined(XFS_ATTR_TRACE)
103 ktrace_t *xfs_attr_trace_buf;
104 #endif
105
106
107 /*========================================================================
108 * Overall external interface routines.
109 *========================================================================*/
110
111 int
112 xfs_attr_fetch(xfs_inode_t *ip, const char *name, int namelen,
113 char *value, int *valuelenp, int flags, struct cred *cred)
114 {
115 xfs_da_args_t args;
116 int error;
117
118 if ((XFS_IFORK_Q(ip) == 0) ||
119 (ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
120 ip->i_d.di_anextents == 0))
121 return(ENOATTR);
122
123 /*
124 * Fill in the arg structure for this request.
125 */
126 memset((char *)&args, 0, sizeof(args));
127 args.name = name;
128 args.namelen = namelen;
129 args.value = value;
130 args.valuelen = *valuelenp;
131 args.flags = flags;
132 args.hashval = xfs_da_hashname(args.name, args.namelen);
133 args.dp = ip;
134 args.whichfork = XFS_ATTR_FORK;
135
136 /*
137 * Decide on what work routines to call based on the inode size.
138 */
139 if (XFS_IFORK_Q(ip) == 0 ||
140 (ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
141 ip->i_d.di_anextents == 0)) {
142 error = XFS_ERROR(ENOATTR);
143 } else if (ip->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
144 error = xfs_attr_shortform_getvalue(&args);
145 } else if (xfs_bmap_one_block(ip, XFS_ATTR_FORK)) {
146 error = xfs_attr_leaf_get(&args);
147 } else {
148 error = xfs_attr_node_get(&args);
149 }
150
151 /*
152 * Return the number of bytes in the value to the caller.
153 */
154 *valuelenp = args.valuelen;
155
156 if (error == EEXIST)
157 error = 0;
158 return(error);
159 }
160
161 int
162 xfs_attr_get(bhv_desc_t *bdp, const char *name, char *value, int *valuelenp,
163 int flags, struct cred *cred)
164 {
165 xfs_inode_t *ip = XFS_BHVTOI(bdp);
166 int error, namelen;
167
168 XFS_STATS_INC(xs_attr_get);
169
170 if (!name)
171 return(EINVAL);
172 namelen = strlen(name);
173 if (namelen >= MAXNAMELEN)
174 return(EFAULT); /* match IRIX behaviour */
175
176 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
177 return(EIO);
178
179 xfs_ilock(ip, XFS_ILOCK_SHARED);
180 error = xfs_attr_fetch(ip, name, namelen, value, valuelenp, flags, cred);
181 xfs_iunlock(ip, XFS_ILOCK_SHARED);
182 return(error);
183 }
184
185 STATIC int
186 xfs_attr_set_int(xfs_inode_t *dp, const char *name, int namelen,
187 char *value, int valuelen, int flags)
188 {
189 xfs_da_args_t args;
190 xfs_fsblock_t firstblock;
191 xfs_bmap_free_t flist;
192 int error, err2, committed;
193 int local, size;
194 uint nblks;
195 xfs_mount_t *mp = dp->i_mount;
196 int rsvd = (flags & ATTR_ROOT) != 0;
197
198 /*
199 * Attach the dquots to the inode.
200 */
201 if ((error = XFS_QM_DQATTACH(mp, dp, 0)))
202 return (error);
203
204 /*
205 * Determine space new attribute will use, and if it would be
206 * "local" or "remote" (note: local != inline).
207 */
208 size = xfs_attr_leaf_newentsize(namelen, valuelen,
209 mp->m_sb.sb_blocksize, &local);
210
211 /*
212 * If the inode doesn't have an attribute fork, add one.
213 * (inode must not be locked when we call this routine)
214 */
215 if (XFS_IFORK_Q(dp) == 0) {
216 if ((error = xfs_bmap_add_attrfork(dp, size, rsvd)))
217 return(error);
218 }
219
220 /*
221 * Fill in the arg structure for this request.
222 */
223 memset((char *)&args, 0, sizeof(args));
224 args.name = name;
225 args.namelen = namelen;
226 args.value = value;
227 args.valuelen = valuelen;
228 args.flags = flags;
229 args.hashval = xfs_da_hashname(args.name, args.namelen);
230 args.dp = dp;
231 args.firstblock = &firstblock;
232 args.flist = &flist;
233 args.whichfork = XFS_ATTR_FORK;
234 args.addname = 1;
235 args.oknoent = 1;
236
237 nblks = XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK);
238 if (local) {
239 if (size > (mp->m_sb.sb_blocksize >> 1)) {
240 /* Double split possible */
241 nblks <<= 1;
242 }
243 } else {
244 uint dblocks = XFS_B_TO_FSB(mp, valuelen);
245 /* Out of line attribute, cannot double split, but make
246 * room for the attribute value itself.
247 */
248 nblks += dblocks;
249 nblks += XFS_NEXTENTADD_SPACE_RES(mp, dblocks, XFS_ATTR_FORK);
250 }
251
252 /* Size is now blocks for attribute data */
253 args.total = nblks;
254
255 /*
256 * Start our first transaction of the day.
257 *
258 * All future transactions during this code must be "chained" off
259 * this one via the trans_dup() call. All transactions will contain
260 * the inode, and the inode will always be marked with trans_ihold().
261 * Since the inode will be locked in all transactions, we must log
262 * the inode in every transaction to let it float upward through
263 * the log.
264 */
265 args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_SET);
266
267 /*
268 * Root fork attributes can use reserved data blocks for this
269 * operation if necessary
270 */
271
272 if (rsvd)
273 args.trans->t_flags |= XFS_TRANS_RESERVE;
274
275 if ((error = xfs_trans_reserve(args.trans, (uint) nblks,
276 XFS_ATTRSET_LOG_RES(mp, nblks),
277 0, XFS_TRANS_PERM_LOG_RES,
278 XFS_ATTRSET_LOG_COUNT))) {
279 xfs_trans_cancel(args.trans, 0);
280 return(error);
281 }
282 xfs_ilock(dp, XFS_ILOCK_EXCL);
283
284 error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, args.trans, dp, nblks, 0,
285 rsvd ? XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
286 XFS_QMOPT_RES_REGBLKS);
287 if (error) {
288 xfs_iunlock(dp, XFS_ILOCK_EXCL);
289 xfs_trans_cancel(args.trans, XFS_TRANS_RELEASE_LOG_RES);
290 return (error);
291 }
292
293 xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
294 xfs_trans_ihold(args.trans, dp);
295
296 /*
297 * If the attribute list is non-existent or a shortform list,
298 * upgrade it to a single-leaf-block attribute list.
299 */
300 if ((dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
301 ((dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS) &&
302 (dp->i_d.di_anextents == 0))) {
303
304 /*
305 * Build initial attribute list (if required).
306 */
307 if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS)
308 xfs_attr_shortform_create(&args);
309
310 /*
311 * Try to add the attr to the attribute list in
312 * the inode.
313 */
314 error = xfs_attr_shortform_addname(&args);
315 if (error != ENOSPC) {
316 /*
317 * Commit the shortform mods, and we're done.
318 * NOTE: this is also the error path (EEXIST, etc).
319 */
320 ASSERT(args.trans != NULL);
321
322 /*
323 * If this is a synchronous mount, make sure that
324 * the transaction goes to disk before returning
325 * to the user.
326 */
327 if (mp->m_flags & XFS_MOUNT_WSYNC) {
328 xfs_trans_set_sync(args.trans);
329 }
330 err2 = xfs_trans_commit(args.trans,
331 XFS_TRANS_RELEASE_LOG_RES,
332 NULL);
333 xfs_iunlock(dp, XFS_ILOCK_EXCL);
334
335 /*
336 * Hit the inode change time.
337 */
338 if (!error && (flags & ATTR_KERNOTIME) == 0) {
339 xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
340 }
341 return(error == 0 ? err2 : error);
342 }
343
344 /*
345 * It won't fit in the shortform, transform to a leaf block.
346 * GROT: another possible req'mt for a double-split btree op.
347 */
348 XFS_BMAP_INIT(args.flist, args.firstblock);
349 error = xfs_attr_shortform_to_leaf(&args);
350 if (!error) {
351 error = xfs_bmap_finish(&args.trans, args.flist,
352 *args.firstblock, &committed);
353 }
354 if (error) {
355 ASSERT(committed);
356 args.trans = NULL;
357 xfs_bmap_cancel(&flist);
358 goto out;
359 }
360
361 /*
362 * bmap_finish() may have committed the last trans and started
363 * a new one. We need the inode to be in all transactions.
364 */
365 if (committed) {
366 xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
367 xfs_trans_ihold(args.trans, dp);
368 }
369
370 /*
371 * Commit the leaf transformation. We'll need another (linked)
372 * transaction to add the new attribute to the leaf.
373 */
374 if ((error = xfs_attr_rolltrans(&args.trans, dp)))
375 goto out;
376
377 }
378
379 if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
380 error = xfs_attr_leaf_addname(&args);
381 } else {
382 error = xfs_attr_node_addname(&args);
383 }
384 if (error) {
385 goto out;
386 }
387
388 /*
389 * If this is a synchronous mount, make sure that the
390 * transaction goes to disk before returning to the user.
391 */
392 if (mp->m_flags & XFS_MOUNT_WSYNC) {
393 xfs_trans_set_sync(args.trans);
394 }
395
396 /*
397 * Commit the last in the sequence of transactions.
398 */
399 xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
400 error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES,
401 NULL);
402 xfs_iunlock(dp, XFS_ILOCK_EXCL);
403
404 /*
405 * Hit the inode change time.
406 */
407 if (!error && (flags & ATTR_KERNOTIME) == 0) {
408 xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
409 }
410
411 return(error);
412
413 out:
414 if (args.trans)
415 xfs_trans_cancel(args.trans,
416 XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
417 xfs_iunlock(dp, XFS_ILOCK_EXCL);
418 return(error);
419 }
420
421 int
422 xfs_attr_set(bhv_desc_t *bdp, const char *name, char *value, int valuelen, int flags,
423 struct cred *cred)
424 {
425 xfs_inode_t *dp;
426 int namelen;
427
428 namelen = strlen(name);
429 if (namelen >= MAXNAMELEN)
430 return EFAULT; /* match IRIX behaviour */
431
432 XFS_STATS_INC(xs_attr_set);
433
434 dp = XFS_BHVTOI(bdp);
435 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
436 return (EIO);
437
438 return xfs_attr_set_int(dp, name, namelen, value, valuelen, flags);
439 }
440
441 /*
442 * Generic handler routine to remove a name from an attribute list.
443 * Transitions attribute list from Btree to shortform as necessary.
444 */
445 STATIC int
446 xfs_attr_remove_int(xfs_inode_t *dp, const char *name, int namelen, int flags)
447 {
448 xfs_da_args_t args;
449 xfs_fsblock_t firstblock;
450 xfs_bmap_free_t flist;
451 int error;
452 xfs_mount_t *mp = dp->i_mount;
453
454 /*
455 * Fill in the arg structure for this request.
456 */
457 memset((char *)&args, 0, sizeof(args));
458 args.name = name;
459 args.namelen = namelen;
460 args.flags = flags;
461 args.hashval = xfs_da_hashname(args.name, args.namelen);
462 args.dp = dp;
463 args.firstblock = &firstblock;
464 args.flist = &flist;
465 args.total = 0;
466 args.whichfork = XFS_ATTR_FORK;
467
468 /*
469 * Attach the dquots to the inode.
470 */
471 if ((error = XFS_QM_DQATTACH(mp, dp, 0)))
472 return (error);
473
474 /*
475 * Start our first transaction of the day.
476 *
477 * All future transactions during this code must be "chained" off
478 * this one via the trans_dup() call. All transactions will contain
479 * the inode, and the inode will always be marked with trans_ihold().
480 * Since the inode will be locked in all transactions, we must log
481 * the inode in every transaction to let it float upward through
482 * the log.
483 */
484 args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_RM);
485
486 /*
487 * Root fork attributes can use reserved data blocks for this
488 * operation if necessary
489 */
490
491 if (flags & ATTR_ROOT)
492 args.trans->t_flags |= XFS_TRANS_RESERVE;
493
494 if ((error = xfs_trans_reserve(args.trans,
495 XFS_ATTRRM_SPACE_RES(mp),
496 XFS_ATTRRM_LOG_RES(mp),
497 0, XFS_TRANS_PERM_LOG_RES,
498 XFS_ATTRRM_LOG_COUNT))) {
499 xfs_trans_cancel(args.trans, 0);
500 return(error);
501 }
502
503 xfs_ilock(dp, XFS_ILOCK_EXCL);
504 /*
505 * No need to make quota reservations here. We expect to release some
506 * blocks not allocate in the common case.
507 */
508 xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
509 xfs_trans_ihold(args.trans, dp);
510
511 /*
512 * Decide on what work routines to call based on the inode size.
513 */
514 if (XFS_IFORK_Q(dp) == 0 ||
515 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
516 dp->i_d.di_anextents == 0)) {
517 error = XFS_ERROR(ENOATTR);
518 goto out;
519 }
520 if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
521 ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
522 error = xfs_attr_shortform_remove(&args);
523 if (error) {
524 goto out;
525 }
526 } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
527 error = xfs_attr_leaf_removename(&args);
528 } else {
529 error = xfs_attr_node_removename(&args);
530 }
531 if (error) {
532 goto out;
533 }
534
535 /*
536 * If this is a synchronous mount, make sure that the
537 * transaction goes to disk before returning to the user.
538 */
539 if (mp->m_flags & XFS_MOUNT_WSYNC) {
540 xfs_trans_set_sync(args.trans);
541 }
542
543 /*
544 * Commit the last in the sequence of transactions.
545 */
546 xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
547 error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES,
548 NULL);
549 xfs_iunlock(dp, XFS_ILOCK_EXCL);
550
551 /*
552 * Hit the inode change time.
553 */
554 if (!error && (flags & ATTR_KERNOTIME) == 0) {
555 xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
556 }
557
558 return(error);
559
560 out:
561 if (args.trans)
562 xfs_trans_cancel(args.trans,
563 XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
564 xfs_iunlock(dp, XFS_ILOCK_EXCL);
565 return(error);
566 }
567
568 int
569 xfs_attr_remove(bhv_desc_t *bdp, const char *name, int flags, struct cred *cred)
570 {
571 xfs_inode_t *dp;
572 int namelen;
573
574 namelen = strlen(name);
575 if (namelen >= MAXNAMELEN)
576 return EFAULT; /* match IRIX behaviour */
577
578 XFS_STATS_INC(xs_attr_remove);
579
580 dp = XFS_BHVTOI(bdp);
581 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
582 return (EIO);
583
584 xfs_ilock(dp, XFS_ILOCK_SHARED);
585 if (XFS_IFORK_Q(dp) == 0 ||
586 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
587 dp->i_d.di_anextents == 0)) {
588 xfs_iunlock(dp, XFS_ILOCK_SHARED);
589 return(XFS_ERROR(ENOATTR));
590 }
591 xfs_iunlock(dp, XFS_ILOCK_SHARED);
592
593 return xfs_attr_remove_int(dp, name, namelen, flags);
594 }
595
596 /*
597 * Generate a list of extended attribute names and optionally
598 * also value lengths. Positive return value follows the XFS
599 * convention of being an error, zero or negative return code
600 * is the length of the buffer returned (negated), indicating
601 * success.
602 */
603 int
604 xfs_attr_list(bhv_desc_t *bdp, char *buffer, int bufsize, int flags,
605 attrlist_cursor_kern_t *cursor, struct cred *cred)
606 {
607 xfs_attr_list_context_t context;
608 xfs_inode_t *dp;
609 int error;
610
611 XFS_STATS_INC(xs_attr_list);
612
613 /*
614 * Validate the cursor.
615 */
616 if (cursor->pad1 || cursor->pad2)
617 return(XFS_ERROR(EINVAL));
618 if ((cursor->initted == 0) &&
619 (cursor->hashval || cursor->blkno || cursor->offset))
620 return(XFS_ERROR(EINVAL));
621
622 /*
623 * Check for a properly aligned buffer.
624 */
625 if (((long)buffer) & (sizeof(int)-1))
626 return(XFS_ERROR(EFAULT));
627 if (flags & ATTR_KERNOVAL)
628 bufsize = 0;
629
630 /*
631 * Initialize the output buffer.
632 */
633 context.dp = dp = XFS_BHVTOI(bdp);
634 context.cursor = cursor;
635 context.count = 0;
636 context.dupcnt = 0;
637 context.resynch = 1;
638 context.flags = flags;
639 if (!(flags & ATTR_KERNAMELS)) {
640 context.bufsize = (bufsize & ~(sizeof(int)-1)); /* align */
641 context.firstu = context.bufsize;
642 context.alist = (attrlist_t *)buffer;
643 context.alist->al_count = 0;
644 context.alist->al_more = 0;
645 context.alist->al_offset[0] = context.bufsize;
646 }
647 else {
648 context.bufsize = bufsize;
649 context.firstu = context.bufsize;
650 context.alist = (attrlist_t *)buffer;
651 }
652
653 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
654 return (EIO);
655
656 xfs_ilock(dp, XFS_ILOCK_SHARED);
657 /*
658 * Decide on what work routines to call based on the inode size.
659 */
660 xfs_attr_trace_l_c("syscall start", &context);
661 if (XFS_IFORK_Q(dp) == 0 ||
662 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
663 dp->i_d.di_anextents == 0)) {
664 error = 0;
665 } else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
666 error = xfs_attr_shortform_list(&context);
667 } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
668 error = xfs_attr_leaf_list(&context);
669 } else {
670 error = xfs_attr_node_list(&context);
671 }
672 xfs_iunlock(dp, XFS_ILOCK_SHARED);
673 xfs_attr_trace_l_c("syscall end", &context);
674
675 if (!(context.flags & (ATTR_KERNOVAL|ATTR_KERNAMELS))) {
676 ASSERT(error >= 0);
677 }
678 else { /* must return negated buffer size or the error */
679 if (context.count < 0)
680 error = XFS_ERROR(ERANGE);
681 else
682 error = -context.count;
683 }
684
685 return(error);
686 }
687
688 int /* error */
689 xfs_attr_inactive(xfs_inode_t *dp)
690 {
691 xfs_trans_t *trans;
692 xfs_mount_t *mp;
693 int error;
694
695 mp = dp->i_mount;
696 ASSERT(! XFS_NOT_DQATTACHED(mp, dp));
697
698 xfs_ilock(dp, XFS_ILOCK_SHARED);
699 if ((XFS_IFORK_Q(dp) == 0) ||
700 (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
701 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
702 dp->i_d.di_anextents == 0)) {
703 xfs_iunlock(dp, XFS_ILOCK_SHARED);
704 return(0);
705 }
706 xfs_iunlock(dp, XFS_ILOCK_SHARED);
707
708 /*
709 * Start our first transaction of the day.
710 *
711 * All future transactions during this code must be "chained" off
712 * this one via the trans_dup() call. All transactions will contain
713 * the inode, and the inode will always be marked with trans_ihold().
714 * Since the inode will be locked in all transactions, we must log
715 * the inode in every transaction to let it float upward through
716 * the log.
717 */
718 trans = xfs_trans_alloc(mp, XFS_TRANS_ATTRINVAL);
719 if ((error = xfs_trans_reserve(trans, 0, XFS_ATTRINVAL_LOG_RES(mp), 0,
720 XFS_TRANS_PERM_LOG_RES,
721 XFS_ATTRINVAL_LOG_COUNT))) {
722 xfs_trans_cancel(trans, 0);
723 return(error);
724 }
725 xfs_ilock(dp, XFS_ILOCK_EXCL);
726
727 /*
728 * No need to make quota reservations here. We expect to release some
729 * blocks, not allocate, in the common case.
730 */
731 xfs_trans_ijoin(trans, dp, XFS_ILOCK_EXCL);
732 xfs_trans_ihold(trans, dp);
733
734 /*
735 * Decide on what work routines to call based on the inode size.
736 */
737 if ((XFS_IFORK_Q(dp) == 0) ||
738 (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
739 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
740 dp->i_d.di_anextents == 0)) {
741 error = 0;
742 goto out;
743 }
744 error = xfs_attr_root_inactive(&trans, dp);
745 if (error)
746 goto out;
747 /*
748 * signal synchronous inactive transactions unless this
749 * is a synchronous mount filesystem in which case we
750 * know that we're here because we've been called out of
751 * xfs_inactive which means that the last reference is gone
752 * and the unlink transaction has already hit the disk so
753 * async inactive transactions are safe.
754 */
755 if ((error = xfs_itruncate_finish(&trans, dp, 0LL, XFS_ATTR_FORK,
756 (!(mp->m_flags & XFS_MOUNT_WSYNC)
757 ? 1 : 0))))
758 goto out;
759
760 /*
761 * Commit the last in the sequence of transactions.
762 */
763 xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
764 error = xfs_trans_commit(trans, XFS_TRANS_RELEASE_LOG_RES,
765 NULL);
766 xfs_iunlock(dp, XFS_ILOCK_EXCL);
767
768 return(error);
769
770 out:
771 xfs_trans_cancel(trans, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
772 xfs_iunlock(dp, XFS_ILOCK_EXCL);
773 return(error);
774 }
775
776
777
778 /*========================================================================
779 * External routines when attribute list is inside the inode
780 *========================================================================*/
781
782 /*
783 * Add a name to the shortform attribute list structure
784 * This is the external routine.
785 */
786 STATIC int
787 xfs_attr_shortform_addname(xfs_da_args_t *args)
788 {
789 int newsize, forkoff, retval;
790
791 retval = xfs_attr_shortform_lookup(args);
792 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
793 return(retval);
794 } else if (retval == EEXIST) {
795 if (args->flags & ATTR_CREATE)
796 return(retval);
797 retval = xfs_attr_shortform_remove(args);
798 ASSERT(retval == 0);
799 }
800
801 if (args->namelen >= XFS_ATTR_SF_ENTSIZE_MAX ||
802 args->valuelen >= XFS_ATTR_SF_ENTSIZE_MAX)
803 return(XFS_ERROR(ENOSPC));
804
805 newsize = XFS_ATTR_SF_TOTSIZE(args->dp);
806 newsize += XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
807
808 forkoff = xfs_attr_shortform_bytesfit(args->dp, newsize);
809 if (!forkoff)
810 return(XFS_ERROR(ENOSPC));
811
812 xfs_attr_shortform_add(args, forkoff);
813 return(0);
814 }
815
816
817 /*========================================================================
818 * External routines when attribute list is one block
819 *========================================================================*/
820
821 /*
822 * Add a name to the leaf attribute list structure
823 *
824 * This leaf block cannot have a "remote" value, we only call this routine
825 * if bmap_one_block() says there is only one block (ie: no remote blks).
826 */
827 int
828 xfs_attr_leaf_addname(xfs_da_args_t *args)
829 {
830 xfs_inode_t *dp;
831 xfs_dabuf_t *bp;
832 int retval, error, committed, forkoff;
833
834 /*
835 * Read the (only) block in the attribute list in.
836 */
837 dp = args->dp;
838 args->blkno = 0;
839 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
840 XFS_ATTR_FORK);
841 if (error)
842 return(error);
843 ASSERT(bp != NULL);
844
845 /*
846 * Look up the given attribute in the leaf block. Figure out if
847 * the given flags produce an error or call for an atomic rename.
848 */
849 retval = xfs_attr_leaf_lookup_int(bp, args);
850 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
851 xfs_da_brelse(args->trans, bp);
852 return(retval);
853 } else if (retval == EEXIST) {
854 if (args->flags & ATTR_CREATE) { /* pure create op */
855 xfs_da_brelse(args->trans, bp);
856 return(retval);
857 }
858 args->rename = 1; /* an atomic rename */
859 args->blkno2 = args->blkno; /* set 2nd entry info*/
860 args->index2 = args->index;
861 args->rmtblkno2 = args->rmtblkno;
862 args->rmtblkcnt2 = args->rmtblkcnt;
863 }
864
865 /*
866 * Add the attribute to the leaf block, transitioning to a Btree
867 * if required.
868 */
869 retval = xfs_attr_leaf_add(bp, args);
870 xfs_da_buf_done(bp);
871 if (retval == ENOSPC) {
872 /*
873 * Promote the attribute list to the Btree format, then
874 * Commit that transaction so that the node_addname() call
875 * can manage its own transactions.
876 */
877 XFS_BMAP_INIT(args->flist, args->firstblock);
878 error = xfs_attr_leaf_to_node(args);
879 if (!error) {
880 error = xfs_bmap_finish(&args->trans, args->flist,
881 *args->firstblock, &committed);
882 }
883 if (error) {
884 ASSERT(committed);
885 args->trans = NULL;
886 xfs_bmap_cancel(args->flist);
887 return(error);
888 }
889
890 /*
891 * bmap_finish() may have committed the last trans and started
892 * a new one. We need the inode to be in all transactions.
893 */
894 if (committed) {
895 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
896 xfs_trans_ihold(args->trans, dp);
897 }
898
899 /*
900 * Commit the current trans (including the inode) and start
901 * a new one.
902 */
903 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
904 return (error);
905
906 /*
907 * Fob the whole rest of the problem off on the Btree code.
908 */
909 error = xfs_attr_node_addname(args);
910 return(error);
911 }
912
913 /*
914 * Commit the transaction that added the attr name so that
915 * later routines can manage their own transactions.
916 */
917 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
918 return (error);
919
920 /*
921 * If there was an out-of-line value, allocate the blocks we
922 * identified for its storage and copy the value. This is done
923 * after we create the attribute so that we don't overflow the
924 * maximum size of a transaction and/or hit a deadlock.
925 */
926 if (args->rmtblkno > 0) {
927 error = xfs_attr_rmtval_set(args);
928 if (error)
929 return(error);
930 }
931
932 /*
933 * If this is an atomic rename operation, we must "flip" the
934 * incomplete flags on the "new" and "old" attribute/value pairs
935 * so that one disappears and one appears atomically. Then we
936 * must remove the "old" attribute/value pair.
937 */
938 if (args->rename) {
939 /*
940 * In a separate transaction, set the incomplete flag on the
941 * "old" attr and clear the incomplete flag on the "new" attr.
942 */
943 error = xfs_attr_leaf_flipflags(args);
944 if (error)
945 return(error);
946
947 /*
948 * Dismantle the "old" attribute/value pair by removing
949 * a "remote" value (if it exists).
950 */
951 args->index = args->index2;
952 args->blkno = args->blkno2;
953 args->rmtblkno = args->rmtblkno2;
954 args->rmtblkcnt = args->rmtblkcnt2;
955 if (args->rmtblkno) {
956 error = xfs_attr_rmtval_remove(args);
957 if (error)
958 return(error);
959 }
960
961 /*
962 * Read in the block containing the "old" attr, then
963 * remove the "old" attr from that block (neat, huh!)
964 */
965 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1,
966 &bp, XFS_ATTR_FORK);
967 if (error)
968 return(error);
969 ASSERT(bp != NULL);
970 (void)xfs_attr_leaf_remove(bp, args);
971
972 /*
973 * If the result is small enough, shrink it all into the inode.
974 */
975 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
976 XFS_BMAP_INIT(args->flist, args->firstblock);
977 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
978 /* bp is gone due to xfs_da_shrink_inode */
979 if (!error) {
980 error = xfs_bmap_finish(&args->trans,
981 args->flist,
982 *args->firstblock,
983 &committed);
984 }
985 if (error) {
986 ASSERT(committed);
987 args->trans = NULL;
988 xfs_bmap_cancel(args->flist);
989 return(error);
990 }
991
992 /*
993 * bmap_finish() may have committed the last trans
994 * and started a new one. We need the inode to be
995 * in all transactions.
996 */
997 if (committed) {
998 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
999 xfs_trans_ihold(args->trans, dp);
1000 }
1001 } else
1002 xfs_da_buf_done(bp);
1003
1004 /*
1005 * Commit the remove and start the next trans in series.
1006 */
1007 error = xfs_attr_rolltrans(&args->trans, dp);
1008
1009 } else if (args->rmtblkno > 0) {
1010 /*
1011 * Added a "remote" value, just clear the incomplete flag.
1012 */
1013 error = xfs_attr_leaf_clearflag(args);
1014 }
1015 return(error);
1016 }
1017
1018 /*
1019 * Remove a name from the leaf attribute list structure
1020 *
1021 * This leaf block cannot have a "remote" value, we only call this routine
1022 * if bmap_one_block() says there is only one block (ie: no remote blks).
1023 */
1024 STATIC int
1025 xfs_attr_leaf_removename(xfs_da_args_t *args)
1026 {
1027 xfs_inode_t *dp;
1028 xfs_dabuf_t *bp;
1029 int error, committed, forkoff;
1030
1031 /*
1032 * Remove the attribute.
1033 */
1034 dp = args->dp;
1035 args->blkno = 0;
1036 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
1037 XFS_ATTR_FORK);
1038 if (error) {
1039 return(error);
1040 }
1041
1042 ASSERT(bp != NULL);
1043 error = xfs_attr_leaf_lookup_int(bp, args);
1044 if (error == ENOATTR) {
1045 xfs_da_brelse(args->trans, bp);
1046 return(error);
1047 }
1048
1049 (void)xfs_attr_leaf_remove(bp, args);
1050
1051 /*
1052 * If the result is small enough, shrink it all into the inode.
1053 */
1054 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1055 XFS_BMAP_INIT(args->flist, args->firstblock);
1056 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1057 /* bp is gone due to xfs_da_shrink_inode */
1058 if (!error) {
1059 error = xfs_bmap_finish(&args->trans, args->flist,
1060 *args->firstblock, &committed);
1061 }
1062 if (error) {
1063 ASSERT(committed);
1064 args->trans = NULL;
1065 xfs_bmap_cancel(args->flist);
1066 return(error);
1067 }
1068
1069 /*
1070 * bmap_finish() may have committed the last trans and started
1071 * a new one. We need the inode to be in all transactions.
1072 */
1073 if (committed) {
1074 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1075 xfs_trans_ihold(args->trans, dp);
1076 }
1077 } else
1078 xfs_da_buf_done(bp);
1079 return(0);
1080 }
1081
1082 /*
1083 * Look up a name in a leaf attribute list structure.
1084 *
1085 * This leaf block cannot have a "remote" value, we only call this routine
1086 * if bmap_one_block() says there is only one block (ie: no remote blks).
1087 */
1088 STATIC int
1089 xfs_attr_leaf_get(xfs_da_args_t *args)
1090 {
1091 xfs_dabuf_t *bp;
1092 int error;
1093
1094 args->blkno = 0;
1095 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
1096 XFS_ATTR_FORK);
1097 if (error)
1098 return(error);
1099 ASSERT(bp != NULL);
1100
1101 error = xfs_attr_leaf_lookup_int(bp, args);
1102 if (error != EEXIST) {
1103 xfs_da_brelse(args->trans, bp);
1104 return(error);
1105 }
1106 error = xfs_attr_leaf_getvalue(bp, args);
1107 xfs_da_brelse(args->trans, bp);
1108 if (!error && (args->rmtblkno > 0) && !(args->flags & ATTR_KERNOVAL)) {
1109 error = xfs_attr_rmtval_get(args);
1110 }
1111 return(error);
1112 }
1113
1114 /*
1115 * Copy out attribute entries for attr_list(), for leaf attribute lists.
1116 */
1117 STATIC int
1118 xfs_attr_leaf_list(xfs_attr_list_context_t *context)
1119 {
1120 xfs_attr_leafblock_t *leaf;
1121 int error;
1122 xfs_dabuf_t *bp;
1123
1124 context->cursor->blkno = 0;
1125 error = xfs_da_read_buf(NULL, context->dp, 0, -1, &bp, XFS_ATTR_FORK);
1126 if (error)
1127 return(error);
1128 ASSERT(bp != NULL);
1129 leaf = bp->data;
1130 if (unlikely(be16_to_cpu(leaf->hdr.info.magic) != XFS_ATTR_LEAF_MAGIC)) {
1131 XFS_CORRUPTION_ERROR("xfs_attr_leaf_list", XFS_ERRLEVEL_LOW,
1132 context->dp->i_mount, leaf);
1133 xfs_da_brelse(NULL, bp);
1134 return(XFS_ERROR(EFSCORRUPTED));
1135 }
1136
1137 (void)xfs_attr_leaf_list_int(bp, context);
1138 xfs_da_brelse(NULL, bp);
1139 return(0);
1140 }
1141
1142
1143 /*========================================================================
1144 * External routines when attribute list size > XFS_LBSIZE(mp).
1145 *========================================================================*/
1146
1147 /*
1148 * Add a name to a Btree-format attribute list.
1149 *
1150 * This will involve walking down the Btree, and may involve splitting
1151 * leaf nodes and even splitting intermediate nodes up to and including
1152 * the root node (a special case of an intermediate node).
1153 *
1154 * "Remote" attribute values confuse the issue and atomic rename operations
1155 * add a whole extra layer of confusion on top of that.
1156 */
1157 STATIC int
1158 xfs_attr_node_addname(xfs_da_args_t *args)
1159 {
1160 xfs_da_state_t *state;
1161 xfs_da_state_blk_t *blk;
1162 xfs_inode_t *dp;
1163 xfs_mount_t *mp;
1164 int committed, retval, error;
1165
1166 /*
1167 * Fill in bucket of arguments/results/context to carry around.
1168 */
1169 dp = args->dp;
1170 mp = dp->i_mount;
1171 restart:
1172 state = xfs_da_state_alloc();
1173 state->args = args;
1174 state->mp = mp;
1175 state->blocksize = state->mp->m_sb.sb_blocksize;
1176 state->node_ents = state->mp->m_attr_node_ents;
1177
1178 /*
1179 * Search to see if name already exists, and get back a pointer
1180 * to where it should go.
1181 */
1182 error = xfs_da_node_lookup_int(state, &retval);
1183 if (error)
1184 goto out;
1185 blk = &state->path.blk[ state->path.active-1 ];
1186 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1187 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
1188 goto out;
1189 } else if (retval == EEXIST) {
1190 if (args->flags & ATTR_CREATE)
1191 goto out;
1192 args->rename = 1; /* atomic rename op */
1193 args->blkno2 = args->blkno; /* set 2nd entry info*/
1194 args->index2 = args->index;
1195 args->rmtblkno2 = args->rmtblkno;
1196 args->rmtblkcnt2 = args->rmtblkcnt;
1197 args->rmtblkno = 0;
1198 args->rmtblkcnt = 0;
1199 }
1200
1201 retval = xfs_attr_leaf_add(blk->bp, state->args);
1202 if (retval == ENOSPC) {
1203 if (state->path.active == 1) {
1204 /*
1205 * Its really a single leaf node, but it had
1206 * out-of-line values so it looked like it *might*
1207 * have been a b-tree.
1208 */
1209 xfs_da_state_free(state);
1210 XFS_BMAP_INIT(args->flist, args->firstblock);
1211 error = xfs_attr_leaf_to_node(args);
1212 if (!error) {
1213 error = xfs_bmap_finish(&args->trans,
1214 args->flist,
1215 *args->firstblock,
1216 &committed);
1217 }
1218 if (error) {
1219 ASSERT(committed);
1220 args->trans = NULL;
1221 xfs_bmap_cancel(args->flist);
1222 goto out;
1223 }
1224
1225 /*
1226 * bmap_finish() may have committed the last trans
1227 * and started a new one. We need the inode to be
1228 * in all transactions.
1229 */
1230 if (committed) {
1231 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1232 xfs_trans_ihold(args->trans, dp);
1233 }
1234
1235 /*
1236 * Commit the node conversion and start the next
1237 * trans in the chain.
1238 */
1239 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1240 goto out;
1241
1242 goto restart;
1243 }
1244
1245 /*
1246 * Split as many Btree elements as required.
1247 * This code tracks the new and old attr's location
1248 * in the index/blkno/rmtblkno/rmtblkcnt fields and
1249 * in the index2/blkno2/rmtblkno2/rmtblkcnt2 fields.
1250 */
1251 XFS_BMAP_INIT(args->flist, args->firstblock);
1252 error = xfs_da_split(state);
1253 if (!error) {
1254 error = xfs_bmap_finish(&args->trans, args->flist,
1255 *args->firstblock, &committed);
1256 }
1257 if (error) {
1258 ASSERT(committed);
1259 args->trans = NULL;
1260 xfs_bmap_cancel(args->flist);
1261 goto out;
1262 }
1263
1264 /*
1265 * bmap_finish() may have committed the last trans and started
1266 * a new one. We need the inode to be in all transactions.
1267 */
1268 if (committed) {
1269 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1270 xfs_trans_ihold(args->trans, dp);
1271 }
1272 } else {
1273 /*
1274 * Addition succeeded, update Btree hashvals.
1275 */
1276 xfs_da_fixhashpath(state, &state->path);
1277 }
1278
1279 /*
1280 * Kill the state structure, we're done with it and need to
1281 * allow the buffers to come back later.
1282 */
1283 xfs_da_state_free(state);
1284 state = NULL;
1285
1286 /*
1287 * Commit the leaf addition or btree split and start the next
1288 * trans in the chain.
1289 */
1290 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1291 goto out;
1292
1293 /*
1294 * If there was an out-of-line value, allocate the blocks we
1295 * identified for its storage and copy the value. This is done
1296 * after we create the attribute so that we don't overflow the
1297 * maximum size of a transaction and/or hit a deadlock.
1298 */
1299 if (args->rmtblkno > 0) {
1300 error = xfs_attr_rmtval_set(args);
1301 if (error)
1302 return(error);
1303 }
1304
1305 /*
1306 * If this is an atomic rename operation, we must "flip" the
1307 * incomplete flags on the "new" and "old" attribute/value pairs
1308 * so that one disappears and one appears atomically. Then we
1309 * must remove the "old" attribute/value pair.
1310 */
1311 if (args->rename) {
1312 /*
1313 * In a separate transaction, set the incomplete flag on the
1314 * "old" attr and clear the incomplete flag on the "new" attr.
1315 */
1316 error = xfs_attr_leaf_flipflags(args);
1317 if (error)
1318 goto out;
1319
1320 /*
1321 * Dismantle the "old" attribute/value pair by removing
1322 * a "remote" value (if it exists).
1323 */
1324 args->index = args->index2;
1325 args->blkno = args->blkno2;
1326 args->rmtblkno = args->rmtblkno2;
1327 args->rmtblkcnt = args->rmtblkcnt2;
1328 if (args->rmtblkno) {
1329 error = xfs_attr_rmtval_remove(args);
1330 if (error)
1331 return(error);
1332 }
1333
1334 /*
1335 * Re-find the "old" attribute entry after any split ops.
1336 * The INCOMPLETE flag means that we will find the "old"
1337 * attr, not the "new" one.
1338 */
1339 args->flags |= XFS_ATTR_INCOMPLETE;
1340 state = xfs_da_state_alloc();
1341 state->args = args;
1342 state->mp = mp;
1343 state->blocksize = state->mp->m_sb.sb_blocksize;
1344 state->node_ents = state->mp->m_attr_node_ents;
1345 state->inleaf = 0;
1346 error = xfs_da_node_lookup_int(state, &retval);
1347 if (error)
1348 goto out;
1349
1350 /*
1351 * Remove the name and update the hashvals in the tree.
1352 */
1353 blk = &state->path.blk[ state->path.active-1 ];
1354 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1355 error = xfs_attr_leaf_remove(blk->bp, args);
1356 xfs_da_fixhashpath(state, &state->path);
1357
1358 /*
1359 * Check to see if the tree needs to be collapsed.
1360 */
1361 if (retval && (state->path.active > 1)) {
1362 XFS_BMAP_INIT(args->flist, args->firstblock);
1363 error = xfs_da_join(state);
1364 if (!error) {
1365 error = xfs_bmap_finish(&args->trans,
1366 args->flist,
1367 *args->firstblock,
1368 &committed);
1369 }
1370 if (error) {
1371 ASSERT(committed);
1372 args->trans = NULL;
1373 xfs_bmap_cancel(args->flist);
1374 goto out;
1375 }
1376
1377 /*
1378 * bmap_finish() may have committed the last trans
1379 * and started a new one. We need the inode to be
1380 * in all transactions.
1381 */
1382 if (committed) {
1383 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1384 xfs_trans_ihold(args->trans, dp);
1385 }
1386 }
1387
1388 /*
1389 * Commit and start the next trans in the chain.
1390 */
1391 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1392 goto out;
1393
1394 } else if (args->rmtblkno > 0) {
1395 /*
1396 * Added a "remote" value, just clear the incomplete flag.
1397 */
1398 error = xfs_attr_leaf_clearflag(args);
1399 if (error)
1400 goto out;
1401 }
1402 retval = error = 0;
1403
1404 out:
1405 if (state)
1406 xfs_da_state_free(state);
1407 if (error)
1408 return(error);
1409 return(retval);
1410 }
1411
1412 /*
1413 * Remove a name from a B-tree attribute list.
1414 *
1415 * This will involve walking down the Btree, and may involve joining
1416 * leaf nodes and even joining intermediate nodes up to and including
1417 * the root node (a special case of an intermediate node).
1418 */
1419 STATIC int
1420 xfs_attr_node_removename(xfs_da_args_t *args)
1421 {
1422 xfs_da_state_t *state;
1423 xfs_da_state_blk_t *blk;
1424 xfs_inode_t *dp;
1425 xfs_dabuf_t *bp;
1426 int retval, error, committed, forkoff;
1427
1428 /*
1429 * Tie a string around our finger to remind us where we are.
1430 */
1431 dp = args->dp;
1432 state = xfs_da_state_alloc();
1433 state->args = args;
1434 state->mp = dp->i_mount;
1435 state->blocksize = state->mp->m_sb.sb_blocksize;
1436 state->node_ents = state->mp->m_attr_node_ents;
1437
1438 /*
1439 * Search to see if name exists, and get back a pointer to it.
1440 */
1441 error = xfs_da_node_lookup_int(state, &retval);
1442 if (error || (retval != EEXIST)) {
1443 if (error == 0)
1444 error = retval;
1445 goto out;
1446 }
1447
1448 /*
1449 * If there is an out-of-line value, de-allocate the blocks.
1450 * This is done before we remove the attribute so that we don't
1451 * overflow the maximum size of a transaction and/or hit a deadlock.
1452 */
1453 blk = &state->path.blk[ state->path.active-1 ];
1454 ASSERT(blk->bp != NULL);
1455 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1456 if (args->rmtblkno > 0) {
1457 /*
1458 * Fill in disk block numbers in the state structure
1459 * so that we can get the buffers back after we commit
1460 * several transactions in the following calls.
1461 */
1462 error = xfs_attr_fillstate(state);
1463 if (error)
1464 goto out;
1465
1466 /*
1467 * Mark the attribute as INCOMPLETE, then bunmapi() the
1468 * remote value.
1469 */
1470 error = xfs_attr_leaf_setflag(args);
1471 if (error)
1472 goto out;
1473 error = xfs_attr_rmtval_remove(args);
1474 if (error)
1475 goto out;
1476
1477 /*
1478 * Refill the state structure with buffers, the prior calls
1479 * released our buffers.
1480 */
1481 error = xfs_attr_refillstate(state);
1482 if (error)
1483 goto out;
1484 }
1485
1486 /*
1487 * Remove the name and update the hashvals in the tree.
1488 */
1489 blk = &state->path.blk[ state->path.active-1 ];
1490 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1491 retval = xfs_attr_leaf_remove(blk->bp, args);
1492 xfs_da_fixhashpath(state, &state->path);
1493
1494 /*
1495 * Check to see if the tree needs to be collapsed.
1496 */
1497 if (retval && (state->path.active > 1)) {
1498 XFS_BMAP_INIT(args->flist, args->firstblock);
1499 error = xfs_da_join(state);
1500 if (!error) {
1501 error = xfs_bmap_finish(&args->trans, args->flist,
1502 *args->firstblock, &committed);
1503 }
1504 if (error) {
1505 ASSERT(committed);
1506 args->trans = NULL;
1507 xfs_bmap_cancel(args->flist);
1508 goto out;
1509 }
1510
1511 /*
1512 * bmap_finish() may have committed the last trans and started
1513 * a new one. We need the inode to be in all transactions.
1514 */
1515 if (committed) {
1516 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1517 xfs_trans_ihold(args->trans, dp);
1518 }
1519
1520 /*
1521 * Commit the Btree join operation and start a new trans.
1522 */
1523 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1524 goto out;
1525 }
1526
1527 /*
1528 * If the result is small enough, push it all into the inode.
1529 */
1530 if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
1531 /*
1532 * Have to get rid of the copy of this dabuf in the state.
1533 */
1534 ASSERT(state->path.active == 1);
1535 ASSERT(state->path.blk[0].bp);
1536 xfs_da_buf_done(state->path.blk[0].bp);
1537 state->path.blk[0].bp = NULL;
1538
1539 error = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp,
1540 XFS_ATTR_FORK);
1541 if (error)
1542 goto out;
1543 ASSERT(be16_to_cpu(((xfs_attr_leafblock_t *)
1544 bp->data)->hdr.info.magic)
1545 == XFS_ATTR_LEAF_MAGIC);
1546
1547 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1548 XFS_BMAP_INIT(args->flist, args->firstblock);
1549 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1550 /* bp is gone due to xfs_da_shrink_inode */
1551 if (!error) {
1552 error = xfs_bmap_finish(&args->trans,
1553 args->flist,
1554 *args->firstblock,
1555 &committed);
1556 }
1557 if (error) {
1558 ASSERT(committed);
1559 args->trans = NULL;
1560 xfs_bmap_cancel(args->flist);
1561 goto out;
1562 }
1563
1564 /*
1565 * bmap_finish() may have committed the last trans
1566 * and started a new one. We need the inode to be
1567 * in all transactions.
1568 */
1569 if (committed) {
1570 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1571 xfs_trans_ihold(args->trans, dp);
1572 }
1573 } else
1574 xfs_da_brelse(args->trans, bp);
1575 }
1576 error = 0;
1577
1578 out:
1579 xfs_da_state_free(state);
1580 return(error);
1581 }
1582
1583 /*
1584 * Fill in the disk block numbers in the state structure for the buffers
1585 * that are attached to the state structure.
1586 * This is done so that we can quickly reattach ourselves to those buffers
1587 * after some set of transaction commits have released these buffers.
1588 */
1589 STATIC int
1590 xfs_attr_fillstate(xfs_da_state_t *state)
1591 {
1592 xfs_da_state_path_t *path;
1593 xfs_da_state_blk_t *blk;
1594 int level;
1595
1596 /*
1597 * Roll down the "path" in the state structure, storing the on-disk
1598 * block number for those buffers in the "path".
1599 */
1600 path = &state->path;
1601 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1602 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1603 if (blk->bp) {
1604 blk->disk_blkno = xfs_da_blkno(blk->bp);
1605 xfs_da_buf_done(blk->bp);
1606 blk->bp = NULL;
1607 } else {
1608 blk->disk_blkno = 0;
1609 }
1610 }
1611
1612 /*
1613 * Roll down the "altpath" in the state structure, storing the on-disk
1614 * block number for those buffers in the "altpath".
1615 */
1616 path = &state->altpath;
1617 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1618 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1619 if (blk->bp) {
1620 blk->disk_blkno = xfs_da_blkno(blk->bp);
1621 xfs_da_buf_done(blk->bp);
1622 blk->bp = NULL;
1623 } else {
1624 blk->disk_blkno = 0;
1625 }
1626 }
1627
1628 return(0);
1629 }
1630
1631 /*
1632 * Reattach the buffers to the state structure based on the disk block
1633 * numbers stored in the state structure.
1634 * This is done after some set of transaction commits have released those
1635 * buffers from our grip.
1636 */
1637 STATIC int
1638 xfs_attr_refillstate(xfs_da_state_t *state)
1639 {
1640 xfs_da_state_path_t *path;
1641 xfs_da_state_blk_t *blk;
1642 int level, error;
1643
1644 /*
1645 * Roll down the "path" in the state structure, storing the on-disk
1646 * block number for those buffers in the "path".
1647 */
1648 path = &state->path;
1649 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1650 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1651 if (blk->disk_blkno) {
1652 error = xfs_da_read_buf(state->args->trans,
1653 state->args->dp,
1654 blk->blkno, blk->disk_blkno,
1655 &blk->bp, XFS_ATTR_FORK);
1656 if (error)
1657 return(error);
1658 } else {
1659 blk->bp = NULL;
1660 }
1661 }
1662
1663 /*
1664 * Roll down the "altpath" in the state structure, storing the on-disk
1665 * block number for those buffers in the "altpath".
1666 */
1667 path = &state->altpath;
1668 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1669 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1670 if (blk->disk_blkno) {
1671 error = xfs_da_read_buf(state->args->trans,
1672 state->args->dp,
1673 blk->blkno, blk->disk_blkno,
1674 &blk->bp, XFS_ATTR_FORK);
1675 if (error)
1676 return(error);
1677 } else {
1678 blk->bp = NULL;
1679 }
1680 }
1681
1682 return(0);
1683 }
1684
1685 /*
1686 * Look up a filename in a node attribute list.
1687 *
1688 * This routine gets called for any attribute fork that has more than one
1689 * block, ie: both true Btree attr lists and for single-leaf-blocks with
1690 * "remote" values taking up more blocks.
1691 */
1692 STATIC int
1693 xfs_attr_node_get(xfs_da_args_t *args)
1694 {
1695 xfs_da_state_t *state;
1696 xfs_da_state_blk_t *blk;
1697 int error, retval;
1698 int i;
1699
1700 state = xfs_da_state_alloc();
1701 state->args = args;
1702 state->mp = args->dp->i_mount;
1703 state->blocksize = state->mp->m_sb.sb_blocksize;
1704 state->node_ents = state->mp->m_attr_node_ents;
1705
1706 /*
1707 * Search to see if name exists, and get back a pointer to it.
1708 */
1709 error = xfs_da_node_lookup_int(state, &retval);
1710 if (error) {
1711 retval = error;
1712 } else if (retval == EEXIST) {
1713 blk = &state->path.blk[ state->path.active-1 ];
1714 ASSERT(blk->bp != NULL);
1715 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1716
1717 /*
1718 * Get the value, local or "remote"
1719 */
1720 retval = xfs_attr_leaf_getvalue(blk->bp, args);
1721 if (!retval && (args->rmtblkno > 0)
1722 && !(args->flags & ATTR_KERNOVAL)) {
1723 retval = xfs_attr_rmtval_get(args);
1724 }
1725 }
1726
1727 /*
1728 * If not in a transaction, we have to release all the buffers.
1729 */
1730 for (i = 0; i < state->path.active; i++) {
1731 xfs_da_brelse(args->trans, state->path.blk[i].bp);
1732 state->path.blk[i].bp = NULL;
1733 }
1734
1735 xfs_da_state_free(state);
1736 return(retval);
1737 }
1738
1739 STATIC int /* error */
1740 xfs_attr_node_list(xfs_attr_list_context_t *context)
1741 {
1742 attrlist_cursor_kern_t *cursor;
1743 xfs_attr_leafblock_t *leaf;
1744 xfs_da_intnode_t *node;
1745 xfs_da_node_entry_t *btree;
1746 int error, i;
1747 xfs_dabuf_t *bp;
1748
1749 cursor = context->cursor;
1750 cursor->initted = 1;
1751
1752 /*
1753 * Do all sorts of validation on the passed-in cursor structure.
1754 * If anything is amiss, ignore the cursor and look up the hashval
1755 * starting from the btree root.
1756 */
1757 bp = NULL;
1758 if (cursor->blkno > 0) {
1759 error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
1760 &bp, XFS_ATTR_FORK);
1761 if ((error != 0) && (error != EFSCORRUPTED))
1762 return(error);
1763 if (bp) {
1764 node = bp->data;
1765 switch (be16_to_cpu(node->hdr.info.magic)) {
1766 case XFS_DA_NODE_MAGIC:
1767 xfs_attr_trace_l_cn("wrong blk", context, node);
1768 xfs_da_brelse(NULL, bp);
1769 bp = NULL;
1770 break;
1771 case XFS_ATTR_LEAF_MAGIC:
1772 leaf = bp->data;
1773 if (cursor->hashval > be32_to_cpu(leaf->entries[
1774 be16_to_cpu(leaf->hdr.count)-1].hashval)) {
1775 xfs_attr_trace_l_cl("wrong blk",
1776 context, leaf);
1777 xfs_da_brelse(NULL, bp);
1778 bp = NULL;
1779 } else if (cursor->hashval <=
1780 be32_to_cpu(leaf->entries[0].hashval)) {
1781 xfs_attr_trace_l_cl("maybe wrong blk",
1782 context, leaf);
1783 xfs_da_brelse(NULL, bp);
1784 bp = NULL;
1785 }
1786 break;
1787 default:
1788 xfs_attr_trace_l_c("wrong blk - ??", context);
1789 xfs_da_brelse(NULL, bp);
1790 bp = NULL;
1791 }
1792 }
1793 }
1794
1795 /*
1796 * We did not find what we expected given the cursor's contents,
1797 * so we start from the top and work down based on the hash value.
1798 * Note that start of node block is same as start of leaf block.
1799 */
1800 if (bp == NULL) {
1801 cursor->blkno = 0;
1802 for (;;) {
1803 error = xfs_da_read_buf(NULL, context->dp,
1804 cursor->blkno, -1, &bp,
1805 XFS_ATTR_FORK);
1806 if (error)
1807 return(error);
1808 if (unlikely(bp == NULL)) {
1809 XFS_ERROR_REPORT("xfs_attr_node_list(2)",
1810 XFS_ERRLEVEL_LOW,
1811 context->dp->i_mount);
1812 return(XFS_ERROR(EFSCORRUPTED));
1813 }
1814 node = bp->data;
1815 if (be16_to_cpu(node->hdr.info.magic)
1816 == XFS_ATTR_LEAF_MAGIC)
1817 break;
1818 if (unlikely(be16_to_cpu(node->hdr.info.magic)
1819 != XFS_DA_NODE_MAGIC)) {
1820 XFS_CORRUPTION_ERROR("xfs_attr_node_list(3)",
1821 XFS_ERRLEVEL_LOW,
1822 context->dp->i_mount,
1823 node);
1824 xfs_da_brelse(NULL, bp);
1825 return(XFS_ERROR(EFSCORRUPTED));
1826 }
1827 btree = node->btree;
1828 for (i = 0; i < be16_to_cpu(node->hdr.count);
1829 btree++, i++) {
1830 if (cursor->hashval
1831 <= be32_to_cpu(btree->hashval)) {
1832 cursor->blkno = be32_to_cpu(btree->before);
1833 xfs_attr_trace_l_cb("descending",
1834 context, btree);
1835 break;
1836 }
1837 }
1838 if (i == be16_to_cpu(node->hdr.count)) {
1839 xfs_da_brelse(NULL, bp);
1840 return(0);
1841 }
1842 xfs_da_brelse(NULL, bp);
1843 }
1844 }
1845 ASSERT(bp != NULL);
1846
1847 /*
1848 * Roll upward through the blocks, processing each leaf block in
1849 * order. As long as there is space in the result buffer, keep
1850 * adding the information.
1851 */
1852 for (;;) {
1853 leaf = bp->data;
1854 if (unlikely(be16_to_cpu(leaf->hdr.info.magic)
1855 != XFS_ATTR_LEAF_MAGIC)) {
1856 XFS_CORRUPTION_ERROR("xfs_attr_node_list(4)",
1857 XFS_ERRLEVEL_LOW,
1858 context->dp->i_mount, leaf);
1859 xfs_da_brelse(NULL, bp);
1860 return(XFS_ERROR(EFSCORRUPTED));
1861 }
1862 error = xfs_attr_leaf_list_int(bp, context);
1863 if (error || !leaf->hdr.info.forw)
1864 break; /* not really an error, buffer full or EOF */
1865 cursor->blkno = be32_to_cpu(leaf->hdr.info.forw);
1866 xfs_da_brelse(NULL, bp);
1867 error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
1868 &bp, XFS_ATTR_FORK);
1869 if (error)
1870 return(error);
1871 if (unlikely((bp == NULL))) {
1872 XFS_ERROR_REPORT("xfs_attr_node_list(5)",
1873 XFS_ERRLEVEL_LOW,
1874 context->dp->i_mount);
1875 return(XFS_ERROR(EFSCORRUPTED));
1876 }
1877 }
1878 xfs_da_brelse(NULL, bp);
1879 return(0);
1880 }
1881
1882
1883 /*========================================================================
1884 * External routines for manipulating out-of-line attribute values.
1885 *========================================================================*/
1886
1887 /*
1888 * Read the value associated with an attribute from the out-of-line buffer
1889 * that we stored it in.
1890 */
1891 STATIC int
1892 xfs_attr_rmtval_get(xfs_da_args_t *args)
1893 {
1894 xfs_bmbt_irec_t map[ATTR_RMTVALUE_MAPSIZE];
1895 xfs_mount_t *mp;
1896 xfs_daddr_t dblkno;
1897 xfs_caddr_t dst;
1898 xfs_buf_t *bp;
1899 int nmap, error, tmp, valuelen, blkcnt, i;
1900 xfs_dablk_t lblkno;
1901
1902 ASSERT(!(args->flags & ATTR_KERNOVAL));
1903
1904 mp = args->dp->i_mount;
1905 dst = args->value;
1906 valuelen = args->valuelen;
1907 lblkno = args->rmtblkno;
1908 while (valuelen > 0) {
1909 nmap = ATTR_RMTVALUE_MAPSIZE;
1910 error = xfs_bmapi(args->trans, args->dp, (xfs_fileoff_t)lblkno,
1911 args->rmtblkcnt,
1912 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
1913 NULL, 0, map, &nmap, NULL);
1914 if (error)
1915 return(error);
1916 ASSERT(nmap >= 1);
1917
1918 for (i = 0; (i < nmap) && (valuelen > 0); i++) {
1919 ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) &&
1920 (map[i].br_startblock != HOLESTARTBLOCK));
1921 dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock);
1922 blkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
1923 error = xfs_read_buf(mp, mp->m_ddev_targp, dblkno,
1924 blkcnt, XFS_BUF_LOCK, &bp);
1925 if (error)
1926 return(error);
1927
1928 tmp = (valuelen < XFS_BUF_SIZE(bp))
1929 ? valuelen : XFS_BUF_SIZE(bp);
1930 xfs_biomove(bp, 0, tmp, dst, XFS_B_READ);
1931 xfs_buf_relse(bp);
1932 dst += tmp;
1933 valuelen -= tmp;
1934
1935 lblkno += map[i].br_blockcount;
1936 }
1937 }
1938 ASSERT(valuelen == 0);
1939 return(0);
1940 }
1941
1942 /*
1943 * Write the value associated with an attribute into the out-of-line buffer
1944 * that we have defined for it.
1945 */
1946 STATIC int
1947 xfs_attr_rmtval_set(xfs_da_args_t *args)
1948 {
1949 xfs_mount_t *mp;
1950 xfs_fileoff_t lfileoff;
1951 xfs_inode_t *dp;
1952 xfs_bmbt_irec_t map;
1953 xfs_daddr_t dblkno;
1954 xfs_caddr_t src;
1955 xfs_buf_t *bp;
1956 xfs_dablk_t lblkno;
1957 int blkcnt, valuelen, nmap, error, tmp, committed;
1958
1959 dp = args->dp;
1960 mp = dp->i_mount;
1961 src = args->value;
1962
1963 /*
1964 * Find a "hole" in the attribute address space large enough for
1965 * us to drop the new attribute's value into.
1966 */
1967 blkcnt = XFS_B_TO_FSB(mp, args->valuelen);
1968 lfileoff = 0;
1969 error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff,
1970 XFS_ATTR_FORK);
1971 if (error) {
1972 return(error);
1973 }
1974 args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff;
1975 args->rmtblkcnt = blkcnt;
1976
1977 /*
1978 * Roll through the "value", allocating blocks on disk as required.
1979 */
1980 while (blkcnt > 0) {
1981 /*
1982 * Allocate a single extent, up to the size of the value.
1983 */
1984 XFS_BMAP_INIT(args->flist, args->firstblock);
1985 nmap = 1;
1986 error = xfs_bmapi(args->trans, dp, (xfs_fileoff_t)lblkno,
1987 blkcnt,
1988 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA |
1989 XFS_BMAPI_WRITE,
1990 args->firstblock, args->total, &map, &nmap,
1991 args->flist);
1992 if (!error) {
1993 error = xfs_bmap_finish(&args->trans, args->flist,
1994 *args->firstblock, &committed);
1995 }
1996 if (error) {
1997 ASSERT(committed);
1998 args->trans = NULL;
1999 xfs_bmap_cancel(args->flist);
2000 return(error);
2001 }
2002
2003 /*
2004 * bmap_finish() may have committed the last trans and started
2005 * a new one. We need the inode to be in all transactions.
2006 */
2007 if (committed) {
2008 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
2009 xfs_trans_ihold(args->trans, dp);
2010 }
2011
2012 ASSERT(nmap == 1);
2013 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2014 (map.br_startblock != HOLESTARTBLOCK));
2015 lblkno += map.br_blockcount;
2016 blkcnt -= map.br_blockcount;
2017
2018 /*
2019 * Start the next trans in the chain.
2020 */
2021 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
2022 return (error);
2023 }
2024
2025 /*
2026 * Roll through the "value", copying the attribute value to the
2027 * already-allocated blocks. Blocks are written synchronously
2028 * so that we can know they are all on disk before we turn off
2029 * the INCOMPLETE flag.
2030 */
2031 lblkno = args->rmtblkno;
2032 valuelen = args->valuelen;
2033 while (valuelen > 0) {
2034 /*
2035 * Try to remember where we decided to put the value.
2036 */
2037 XFS_BMAP_INIT(args->flist, args->firstblock);
2038 nmap = 1;
2039 error = xfs_bmapi(NULL, dp, (xfs_fileoff_t)lblkno,
2040 args->rmtblkcnt,
2041 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2042 args->firstblock, 0, &map, &nmap, NULL);
2043 if (error) {
2044 return(error);
2045 }
2046 ASSERT(nmap == 1);
2047 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2048 (map.br_startblock != HOLESTARTBLOCK));
2049
2050 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
2051 blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
2052
2053 bp = xfs_buf_get_flags(mp->m_ddev_targp, dblkno,
2054 blkcnt, XFS_BUF_LOCK);
2055 ASSERT(bp);
2056 ASSERT(!XFS_BUF_GETERROR(bp));
2057
2058 tmp = (valuelen < XFS_BUF_SIZE(bp)) ? valuelen :
2059 XFS_BUF_SIZE(bp);
2060 xfs_biomove(bp, 0, tmp, src, XFS_B_WRITE);
2061 if (tmp < XFS_BUF_SIZE(bp))
2062 xfs_biozero(bp, tmp, XFS_BUF_SIZE(bp) - tmp);
2063 if ((error = xfs_bwrite(mp, bp))) {/* GROT: NOTE: synchronous write */
2064 return (error);
2065 }
2066 src += tmp;
2067 valuelen -= tmp;
2068
2069 lblkno += map.br_blockcount;
2070 }
2071 ASSERT(valuelen == 0);
2072 return(0);
2073 }
2074
2075 /*
2076 * Remove the value associated with an attribute by deleting the
2077 * out-of-line buffer that it is stored on.
2078 */
2079 STATIC int
2080 xfs_attr_rmtval_remove(xfs_da_args_t *args)
2081 {
2082 xfs_mount_t *mp;
2083 xfs_bmbt_irec_t map;
2084 xfs_buf_t *bp;
2085 xfs_daddr_t dblkno;
2086 xfs_dablk_t lblkno;
2087 int valuelen, blkcnt, nmap, error, done, committed;
2088
2089 mp = args->dp->i_mount;
2090
2091 /*
2092 * Roll through the "value", invalidating the attribute value's
2093 * blocks.
2094 */
2095 lblkno = args->rmtblkno;
2096 valuelen = args->rmtblkcnt;
2097 while (valuelen > 0) {
2098 /*
2099 * Try to remember where we decided to put the value.
2100 */
2101 XFS_BMAP_INIT(args->flist, args->firstblock);
2102 nmap = 1;
2103 error = xfs_bmapi(NULL, args->dp, (xfs_fileoff_t)lblkno,
2104 args->rmtblkcnt,
2105 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2106 args->firstblock, 0, &map, &nmap,
2107 args->flist);
2108 if (error) {
2109 return(error);
2110 }
2111 ASSERT(nmap == 1);
2112 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2113 (map.br_startblock != HOLESTARTBLOCK));
2114
2115 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
2116 blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
2117
2118 /*
2119 * If the "remote" value is in the cache, remove it.
2120 */
2121 bp = xfs_incore(mp->m_ddev_targp, dblkno, blkcnt,
2122 XFS_INCORE_TRYLOCK);
2123 if (bp) {
2124 XFS_BUF_STALE(bp);
2125 XFS_BUF_UNDELAYWRITE(bp);
2126 xfs_buf_relse(bp);
2127 bp = NULL;
2128 }
2129
2130 valuelen -= map.br_blockcount;
2131
2132 lblkno += map.br_blockcount;
2133 }
2134
2135 /*
2136 * Keep de-allocating extents until the remote-value region is gone.
2137 */
2138 lblkno = args->rmtblkno;
2139 blkcnt = args->rmtblkcnt;
2140 done = 0;
2141 while (!done) {
2142 XFS_BMAP_INIT(args->flist, args->firstblock);
2143 error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt,
2144 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2145 1, args->firstblock, args->flist, &done);
2146 if (!error) {
2147 error = xfs_bmap_finish(&args->trans, args->flist,
2148 *args->firstblock, &committed);
2149 }
2150 if (error) {
2151 ASSERT(committed);
2152 args->trans = NULL;
2153 xfs_bmap_cancel(args->flist);
2154 return(error);
2155 }
2156
2157 /*
2158 * bmap_finish() may have committed the last trans and started
2159 * a new one. We need the inode to be in all transactions.
2160 */
2161 if (committed) {
2162 xfs_trans_ijoin(args->trans, args->dp, XFS_ILOCK_EXCL);
2163 xfs_trans_ihold(args->trans, args->dp);
2164 }
2165
2166 /*
2167 * Close out trans and start the next one in the chain.
2168 */
2169 if ((error = xfs_attr_rolltrans(&args->trans, args->dp)))
2170 return (error);
2171 }
2172 return(0);
2173 }
2174
2175 #if defined(XFS_ATTR_TRACE)
2176 /*
2177 * Add a trace buffer entry for an attr_list context structure.
2178 */
2179 void
2180 xfs_attr_trace_l_c(char *where, struct xfs_attr_list_context *context)
2181 {
2182 xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_C, where,
2183 (__psunsigned_t)context->dp,
2184 (__psunsigned_t)context->cursor->hashval,
2185 (__psunsigned_t)context->cursor->blkno,
2186 (__psunsigned_t)context->cursor->offset,
2187 (__psunsigned_t)context->alist,
2188 (__psunsigned_t)context->bufsize,
2189 (__psunsigned_t)context->count,
2190 (__psunsigned_t)context->firstu,
2191 (__psunsigned_t)
2192 ((context->count > 0) &&
2193 !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2194 ? (ATTR_ENTRY(context->alist,
2195 context->count-1)->a_valuelen)
2196 : 0,
2197 (__psunsigned_t)context->dupcnt,
2198 (__psunsigned_t)context->flags,
2199 (__psunsigned_t)NULL,
2200 (__psunsigned_t)NULL,
2201 (__psunsigned_t)NULL);
2202 }
2203
2204 /*
2205 * Add a trace buffer entry for a context structure and a Btree node.
2206 */
2207 void
2208 xfs_attr_trace_l_cn(char *where, struct xfs_attr_list_context *context,
2209 struct xfs_da_intnode *node)
2210 {
2211 xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CN, where,
2212 (__psunsigned_t)context->dp,
2213 (__psunsigned_t)context->cursor->hashval,
2214 (__psunsigned_t)context->cursor->blkno,
2215 (__psunsigned_t)context->cursor->offset,
2216 (__psunsigned_t)context->alist,
2217 (__psunsigned_t)context->bufsize,
2218 (__psunsigned_t)context->count,
2219 (__psunsigned_t)context->firstu,
2220 (__psunsigned_t)
2221 ((context->count > 0) &&
2222 !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2223 ? (ATTR_ENTRY(context->alist,
2224 context->count-1)->a_valuelen)
2225 : 0,
2226 (__psunsigned_t)context->dupcnt,
2227 (__psunsigned_t)context->flags,
2228 (__psunsigned_t)be16_to_cpu(node->hdr.count),
2229 (__psunsigned_t)be32_to_cpu(node->btree[0].hashval),
2230 (__psunsigned_t)be32_to_cpu(node->btree[
2231 be16_to_cpu(node->hdr.count)-1].hashval));
2232 }
2233
2234 /*
2235 * Add a trace buffer entry for a context structure and a Btree element.
2236 */
2237 void
2238 xfs_attr_trace_l_cb(char *where, struct xfs_attr_list_context *context,
2239 struct xfs_da_node_entry *btree)
2240 {
2241 xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CB, where,
2242 (__psunsigned_t)context->dp,
2243 (__psunsigned_t)context->cursor->hashval,
2244 (__psunsigned_t)context->cursor->blkno,
2245 (__psunsigned_t)context->cursor->offset,
2246 (__psunsigned_t)context->alist,
2247 (__psunsigned_t)context->bufsize,
2248 (__psunsigned_t)context->count,
2249 (__psunsigned_t)context->firstu,
2250 (__psunsigned_t)
2251 ((context->count > 0) &&
2252 !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2253 ? (ATTR_ENTRY(context->alist,
2254 context->count-1)->a_valuelen)
2255 : 0,
2256 (__psunsigned_t)context->dupcnt,
2257 (__psunsigned_t)context->flags,
2258 (__psunsigned_t)be32_to_cpu(btree->hashval),
2259 (__psunsigned_t)be32_to_cpu(btree->before),
2260 (__psunsigned_t)NULL);
2261 }
2262
2263 /*
2264 * Add a trace buffer entry for a context structure and a leaf block.
2265 */
2266 void
2267 xfs_attr_trace_l_cl(char *where, struct xfs_attr_list_context *context,
2268 struct xfs_attr_leafblock *leaf)
2269 {
2270 xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CL, where,
2271 (__psunsigned_t)context->dp,
2272 (__psunsigned_t)context->cursor->hashval,
2273 (__psunsigned_t)context->cursor->blkno,
2274 (__psunsigned_t)context->cursor->offset,
2275 (__psunsigned_t)context->alist,
2276 (__psunsigned_t)context->bufsize,
2277 (__psunsigned_t)context->count,
2278 (__psunsigned_t)context->firstu,
2279 (__psunsigned_t)
2280 ((context->count > 0) &&
2281 !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2282 ? (ATTR_ENTRY(context->alist,
2283 context->count-1)->a_valuelen)
2284 : 0,
2285 (__psunsigned_t)context->dupcnt,
2286 (__psunsigned_t)context->flags,
2287 (__psunsigned_t)be16_to_cpu(leaf->hdr.count),
2288 (__psunsigned_t)be32_to_cpu(leaf->entries[0].hashval),
2289 (__psunsigned_t)be32_to_cpu(leaf->entries[
2290 be16_to_cpu(leaf->hdr.count)-1].hashval));
2291 }
2292
2293 /*
2294 * Add a trace buffer entry for the arguments given to the routine,
2295 * generic form.
2296 */
2297 void
2298 xfs_attr_trace_enter(int type, char *where,
2299 __psunsigned_t a2, __psunsigned_t a3,
2300 __psunsigned_t a4, __psunsigned_t a5,
2301 __psunsigned_t a6, __psunsigned_t a7,
2302 __psunsigned_t a8, __psunsigned_t a9,
2303 __psunsigned_t a10, __psunsigned_t a11,
2304 __psunsigned_t a12, __psunsigned_t a13,
2305 __psunsigned_t a14, __psunsigned_t a15)
2306 {
2307 ASSERT(xfs_attr_trace_buf);
2308 ktrace_enter(xfs_attr_trace_buf, (void *)((__psunsigned_t)type),
2309 (void *)where,
2310 (void *)a2, (void *)a3, (void *)a4,
2311 (void *)a5, (void *)a6, (void *)a7,
2312 (void *)a8, (void *)a9, (void *)a10,
2313 (void *)a11, (void *)a12, (void *)a13,
2314 (void *)a14, (void *)a15);
2315 }
2316 #endif /* XFS_ATTR_TRACE */
2317
2318
2319 /*========================================================================
2320 * System (pseudo) namespace attribute interface routines.
2321 *========================================================================*/
2322
2323 STATIC int
2324 posix_acl_access_set(
2325 vnode_t *vp, char *name, void *data, size_t size, int xflags)
2326 {
2327 return xfs_acl_vset(vp, data, size, _ACL_TYPE_ACCESS);
2328 }
2329
2330 STATIC int
2331 posix_acl_access_remove(
2332 struct vnode *vp, char *name, int xflags)
2333 {
2334 return xfs_acl_vremove(vp, _ACL_TYPE_ACCESS);
2335 }
2336
2337 STATIC int
2338 posix_acl_access_get(
2339 vnode_t *vp, char *name, void *data, size_t size, int xflags)
2340 {
2341 return xfs_acl_vget(vp, data, size, _ACL_TYPE_ACCESS);
2342 }
2343
2344 STATIC int
2345 posix_acl_access_exists(
2346 vnode_t *vp)
2347 {
2348 return xfs_acl_vhasacl_access(vp);
2349 }
2350
2351 STATIC int
2352 posix_acl_default_set(
2353 vnode_t *vp, char *name, void *data, size_t size, int xflags)
2354 {
2355 return xfs_acl_vset(vp, data, size, _ACL_TYPE_DEFAULT);
2356 }
2357
2358 STATIC int
2359 posix_acl_default_get(
2360 vnode_t *vp, char *name, void *data, size_t size, int xflags)
2361 {
2362 return xfs_acl_vget(vp, data, size, _ACL_TYPE_DEFAULT);
2363 }
2364
2365 STATIC int
2366 posix_acl_default_remove(
2367 struct vnode *vp, char *name, int xflags)
2368 {
2369 return xfs_acl_vremove(vp, _ACL_TYPE_DEFAULT);
2370 }
2371
2372 STATIC int
2373 posix_acl_default_exists(
2374 vnode_t *vp)
2375 {
2376 return xfs_acl_vhasacl_default(vp);
2377 }
2378
2379 STATIC struct attrnames posix_acl_access = {
2380 .attr_name = "posix_acl_access",
2381 .attr_namelen = sizeof("posix_acl_access") - 1,
2382 .attr_get = posix_acl_access_get,
2383 .attr_set = posix_acl_access_set,
2384 .attr_remove = posix_acl_access_remove,
2385 .attr_exists = posix_acl_access_exists,
2386 };
2387
2388 STATIC struct attrnames posix_acl_default = {
2389 .attr_name = "posix_acl_default",
2390 .attr_namelen = sizeof("posix_acl_default") - 1,
2391 .attr_get = posix_acl_default_get,
2392 .attr_set = posix_acl_default_set,
2393 .attr_remove = posix_acl_default_remove,
2394 .attr_exists = posix_acl_default_exists,
2395 };
2396
2397 STATIC struct attrnames *attr_system_names[] =
2398 { &posix_acl_access, &posix_acl_default };
2399
2400
2401 /*========================================================================
2402 * Namespace-prefix-style attribute name interface routines.
2403 *========================================================================*/
2404
2405 STATIC int
2406 attr_generic_set(
2407 struct vnode *vp, char *name, void *data, size_t size, int xflags)
2408 {
2409 int error;
2410
2411 VOP_ATTR_SET(vp, name, data, size, xflags, NULL, error);
2412 return -error;
2413 }
2414
2415 STATIC int
2416 attr_generic_get(
2417 struct vnode *vp, char *name, void *data, size_t size, int xflags)
2418 {
2419 int error, asize = size;
2420
2421 VOP_ATTR_GET(vp, name, data, &asize, xflags, NULL, error);
2422 if (!error)
2423 return asize;
2424 return -error;
2425 }
2426
2427 STATIC int
2428 attr_generic_remove(
2429 struct vnode *vp, char *name, int xflags)
2430 {
2431 int error;
2432
2433 VOP_ATTR_REMOVE(vp, name, xflags, NULL, error);
2434 return -error;
2435 }
2436
2437 STATIC int
2438 attr_generic_listadd(
2439 attrnames_t *prefix,
2440 attrnames_t *namesp,
2441 void *data,
2442 size_t size,
2443 ssize_t *result)
2444 {
2445 char *p = data + *result;
2446
2447 *result += prefix->attr_namelen;
2448 *result += namesp->attr_namelen + 1;
2449 if (!size)
2450 return 0;
2451 if (*result > size)
2452 return -ERANGE;
2453 strcpy(p, prefix->attr_name);
2454 p += prefix->attr_namelen;
2455 strcpy(p, namesp->attr_name);
2456 p += namesp->attr_namelen + 1;
2457 return 0;
2458 }
2459
2460 STATIC int
2461 attr_system_list(
2462 struct vnode *vp,
2463 void *data,
2464 size_t size,
2465 ssize_t *result)
2466 {
2467 attrnames_t *namesp;
2468 int i, error = 0;
2469
2470 for (i = 0; i < ATTR_SYSCOUNT; i++) {
2471 namesp = attr_system_names[i];
2472 if (!namesp->attr_exists || !namesp->attr_exists(vp))
2473 continue;
2474 error = attr_generic_listadd(&attr_system, namesp,
2475 data, size, result);
2476 if (error)
2477 break;
2478 }
2479 return error;
2480 }
2481
2482 int
2483 attr_generic_list(
2484 struct vnode *vp, void *data, size_t size, int xflags, ssize_t *result)
2485 {
2486 attrlist_cursor_kern_t cursor = { 0 };
2487 int error;
2488
2489 VOP_ATTR_LIST(vp, data, size, xflags, &cursor, NULL, error);
2490 if (error > 0)
2491 return -error;
2492 *result = -error;
2493 return attr_system_list(vp, data, size, result);
2494 }
2495
2496 attrnames_t *
2497 attr_lookup_namespace(
2498 char *name,
2499 struct attrnames **names,
2500 int nnames)
2501 {
2502 int i;
2503
2504 for (i = 0; i < nnames; i++)
2505 if (!strncmp(name, names[i]->attr_name, names[i]->attr_namelen))
2506 return names[i];
2507 return NULL;
2508 }
2509
2510 /*
2511 * Some checks to prevent people abusing EAs to get over quota:
2512 * - Don't allow modifying user EAs on devices/symlinks;
2513 * - Don't allow modifying user EAs if sticky bit set;
2514 */
2515 STATIC int
2516 attr_user_capable(
2517 struct vnode *vp,
2518 cred_t *cred)
2519 {
2520 struct inode *inode = vn_to_inode(vp);
2521
2522 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
2523 return -EPERM;
2524 if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode) &&
2525 !capable(CAP_SYS_ADMIN))
2526 return -EPERM;
2527 if (S_ISDIR(inode->i_mode) && (inode->i_mode & S_ISVTX) &&
2528 (current_fsuid(cred) != inode->i_uid) && !capable(CAP_FOWNER))
2529 return -EPERM;
2530 return 0;
2531 }
2532
2533 STATIC int
2534 attr_trusted_capable(
2535 struct vnode *vp,
2536 cred_t *cred)
2537 {
2538 struct inode *inode = vn_to_inode(vp);
2539
2540 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
2541 return -EPERM;
2542 if (!capable(CAP_SYS_ADMIN))
2543 return -EPERM;
2544 return 0;
2545 }
2546
2547 STATIC int
2548 attr_secure_capable(
2549 struct vnode *vp,
2550 cred_t *cred)
2551 {
2552 return -ENOSECURITY;
2553 }
2554
2555 STATIC int
2556 attr_system_set(
2557 struct vnode *vp, char *name, void *data, size_t size, int xflags)
2558 {
2559 attrnames_t *namesp;
2560 int error;
2561
2562 if (xflags & ATTR_CREATE)
2563 return -EINVAL;
2564
2565 namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT);
2566 if (!namesp)
2567 return -EOPNOTSUPP;
2568 error = namesp->attr_set(vp, name, data, size, xflags);
2569 if (!error)
2570 error = vn_revalidate(vp);
2571 return error;
2572 }
2573
2574 STATIC int
2575 attr_system_get(
2576 struct vnode *vp, char *name, void *data, size_t size, int xflags)
2577 {
2578 attrnames_t *namesp;
2579
2580 namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT);
2581 if (!namesp)
2582 return -EOPNOTSUPP;
2583 return namesp->attr_get(vp, name, data, size, xflags);
2584 }
2585
2586 STATIC int
2587 attr_system_remove(
2588 struct vnode *vp, char *name, int xflags)
2589 {
2590 attrnames_t *namesp;
2591
2592 namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT);
2593 if (!namesp)
2594 return -EOPNOTSUPP;
2595 return namesp->attr_remove(vp, name, xflags);
2596 }
2597
2598 struct attrnames attr_system = {
2599 .attr_name = "system.",
2600 .attr_namelen = sizeof("system.") - 1,
2601 .attr_flag = ATTR_SYSTEM,
2602 .attr_get = attr_system_get,
2603 .attr_set = attr_system_set,
2604 .attr_remove = attr_system_remove,
2605 .attr_capable = (attrcapable_t)fs_noerr,
2606 };
2607
2608 struct attrnames attr_trusted = {
2609 .attr_name = "trusted.",
2610 .attr_namelen = sizeof("trusted.") - 1,
2611 .attr_flag = ATTR_ROOT,
2612 .attr_get = attr_generic_get,
2613 .attr_set = attr_generic_set,
2614 .attr_remove = attr_generic_remove,
2615 .attr_capable = attr_trusted_capable,
2616 };
2617
2618 struct attrnames attr_secure = {
2619 .attr_name = "security.",
2620 .attr_namelen = sizeof("security.") - 1,
2621 .attr_flag = ATTR_SECURE,
2622 .attr_get = attr_generic_get,
2623 .attr_set = attr_generic_set,
2624 .attr_remove = attr_generic_remove,
2625 .attr_capable = attr_secure_capable,
2626 };
2627
2628 struct attrnames attr_user = {
2629 .attr_name = "user.",
2630 .attr_namelen = sizeof("user.") - 1,
2631 .attr_get = attr_generic_get,
2632 .attr_set = attr_generic_set,
2633 .attr_remove = attr_generic_remove,
2634 .attr_capable = attr_user_capable,
2635 };
2636
2637 struct attrnames *attr_namespaces[] =
2638 { &attr_system, &attr_trusted, &attr_secure, &attr_user };
Software Suspend 2 for 2.6.18.y (mirror)