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aufs: possible bugfix, allow the nested aufsd between several aufs mounts
[zen-stable.git] / fs / xfs / xfs_attr.c
blob08b9ac644c3140f6f6cc007f6f3eab05331ff35b
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 "xfs.h"
20 #include "xfs_fs.h"
21 #include "xfs_types.h"
22 #include "xfs_bit.h"
23 #include "xfs_log.h"
24 #include "xfs_inum.h"
25 #include "xfs_trans.h"
26 #include "xfs_sb.h"
27 #include "xfs_ag.h"
28 #include "xfs_mount.h"
29 #include "xfs_da_btree.h"
30 #include "xfs_bmap_btree.h"
31 #include "xfs_attr_sf.h"
32 #include "xfs_dinode.h"
33 #include "xfs_inode.h"
34 #include "xfs_alloc.h"
35 #include "xfs_inode_item.h"
36 #include "xfs_bmap.h"
37 #include "xfs_attr.h"
38 #include "xfs_attr_leaf.h"
39 #include "xfs_error.h"
40 #include "xfs_quota.h"
41 #include "xfs_trans_space.h"
42 #include "xfs_rw.h"
43 #include "xfs_vnodeops.h"
44 #include "xfs_trace.h"
45
46 /*
47 * xfs_attr.c
48 *
49 * Provide the external interfaces to manage attribute lists.
50 */
51
52 /*========================================================================
53 * Function prototypes for the kernel.
54 *========================================================================*/
55
56 /*
57 * Internal routines when attribute list fits inside the inode.
58 */
59 STATIC int xfs_attr_shortform_addname(xfs_da_args_t *args);
60
61 /*
62 * Internal routines when attribute list is one block.
63 */
64 STATIC int xfs_attr_leaf_get(xfs_da_args_t *args);
65 STATIC int xfs_attr_leaf_addname(xfs_da_args_t *args);
66 STATIC int xfs_attr_leaf_removename(xfs_da_args_t *args);
67 STATIC int xfs_attr_leaf_list(xfs_attr_list_context_t *context);
68
69 /*
70 * Internal routines when attribute list is more than one block.
71 */
72 STATIC int xfs_attr_node_get(xfs_da_args_t *args);
73 STATIC int xfs_attr_node_addname(xfs_da_args_t *args);
74 STATIC int xfs_attr_node_removename(xfs_da_args_t *args);
75 STATIC int xfs_attr_node_list(xfs_attr_list_context_t *context);
76 STATIC int xfs_attr_fillstate(xfs_da_state_t *state);
77 STATIC int xfs_attr_refillstate(xfs_da_state_t *state);
78
79 /*
80 * Routines to manipulate out-of-line attribute values.
81 */
82 STATIC int xfs_attr_rmtval_set(xfs_da_args_t *args);
83 STATIC int xfs_attr_rmtval_remove(xfs_da_args_t *args);
84
85 #define ATTR_RMTVALUE_MAPSIZE 1 /* # of map entries at once */
86
87 STATIC int
88 xfs_attr_name_to_xname(
89 struct xfs_name *xname,
90 const unsigned char *aname)
91 {
92 if (!aname)
93 return EINVAL;
94 xname->name = aname;
95 xname->len = strlen((char *)aname);
96 if (xname->len >= MAXNAMELEN)
97 return EFAULT; /* match IRIX behaviour */
98
99 return 0;
100 }
101
102 STATIC int
103 xfs_inode_hasattr(
104 struct xfs_inode *ip)
105 {
106 if (!XFS_IFORK_Q(ip) ||
107 (ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
108 ip->i_d.di_anextents == 0))
109 return 0;
110 return 1;
111 }
112
113 /*========================================================================
114 * Overall external interface routines.
115 *========================================================================*/
116
117 STATIC int
118 xfs_attr_get_int(
119 struct xfs_inode *ip,
120 struct xfs_name *name,
121 unsigned char *value,
122 int *valuelenp,
123 int flags)
124 {
125 xfs_da_args_t args;
126 int error;
127
128 if (!xfs_inode_hasattr(ip))
129 return ENOATTR;
130
131 /*
132 * Fill in the arg structure for this request.
133 */
134 memset((char *)&args, 0, sizeof(args));
135 args.name = name->name;
136 args.namelen = name->len;
137 args.value = value;
138 args.valuelen = *valuelenp;
139 args.flags = flags;
140 args.hashval = xfs_da_hashname(args.name, args.namelen);
141 args.dp = ip;
142 args.whichfork = XFS_ATTR_FORK;
143
144 /*
145 * Decide on what work routines to call based on the inode size.
146 */
147 if (ip->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
148 error = xfs_attr_shortform_getvalue(&args);
149 } else if (xfs_bmap_one_block(ip, XFS_ATTR_FORK)) {
150 error = xfs_attr_leaf_get(&args);
151 } else {
152 error = xfs_attr_node_get(&args);
153 }
154
155 /*
156 * Return the number of bytes in the value to the caller.
157 */
158 *valuelenp = args.valuelen;
159
160 if (error == EEXIST)
161 error = 0;
162 return(error);
163 }
164
165 int
166 xfs_attr_get(
167 xfs_inode_t *ip,
168 const unsigned char *name,
169 unsigned char *value,
170 int *valuelenp,
171 int flags)
172 {
173 int error;
174 struct xfs_name xname;
175
176 XFS_STATS_INC(xs_attr_get);
177
178 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
179 return(EIO);
180
181 error = xfs_attr_name_to_xname(&xname, name);
182 if (error)
183 return error;
184
185 xfs_ilock(ip, XFS_ILOCK_SHARED);
186 error = xfs_attr_get_int(ip, &xname, value, valuelenp, flags);
187 xfs_iunlock(ip, XFS_ILOCK_SHARED);
188 return(error);
189 }
190
191 /*
192 * Calculate how many blocks we need for the new attribute,
193 */
194 STATIC int
195 xfs_attr_calc_size(
196 struct xfs_inode *ip,
197 int namelen,
198 int valuelen,
199 int *local)
200 {
201 struct xfs_mount *mp = ip->i_mount;
202 int size;
203 int nblks;
204
205 /*
206 * Determine space new attribute will use, and if it would be
207 * "local" or "remote" (note: local != inline).
208 */
209 size = xfs_attr_leaf_newentsize(namelen, valuelen,
210 mp->m_sb.sb_blocksize, local);
211
212 nblks = XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK);
213 if (*local) {
214 if (size > (mp->m_sb.sb_blocksize >> 1)) {
215 /* Double split possible */
216 nblks *= 2;
217 }
218 } else {
219 /*
220 * Out of line attribute, cannot double split, but
221 * make room for the attribute value itself.
222 */
223 uint dblocks = XFS_B_TO_FSB(mp, valuelen);
224 nblks += dblocks;
225 nblks += XFS_NEXTENTADD_SPACE_RES(mp, dblocks, XFS_ATTR_FORK);
226 }
227
228 return nblks;
229 }
230
231 STATIC int
232 xfs_attr_set_int(
233 struct xfs_inode *dp,
234 struct xfs_name *name,
235 unsigned char *value,
236 int valuelen,
237 int flags)
238 {
239 xfs_da_args_t args;
240 xfs_fsblock_t firstblock;
241 xfs_bmap_free_t flist;
242 int error, err2, committed;
243 xfs_mount_t *mp = dp->i_mount;
244 int rsvd = (flags & ATTR_ROOT) != 0;
245 int local;
246
247 /*
248 * Attach the dquots to the inode.
249 */
250 error = xfs_qm_dqattach(dp, 0);
251 if (error)
252 return error;
253
254 /*
255 * If the inode doesn't have an attribute fork, add one.
256 * (inode must not be locked when we call this routine)
257 */
258 if (XFS_IFORK_Q(dp) == 0) {
259 int sf_size = sizeof(xfs_attr_sf_hdr_t) +
260 XFS_ATTR_SF_ENTSIZE_BYNAME(name->len, valuelen);
261
262 if ((error = xfs_bmap_add_attrfork(dp, sf_size, rsvd)))
263 return(error);
264 }
265
266 /*
267 * Fill in the arg structure for this request.
268 */
269 memset((char *)&args, 0, sizeof(args));
270 args.name = name->name;
271 args.namelen = name->len;
272 args.value = value;
273 args.valuelen = valuelen;
274 args.flags = flags;
275 args.hashval = xfs_da_hashname(args.name, args.namelen);
276 args.dp = dp;
277 args.firstblock = &firstblock;
278 args.flist = &flist;
279 args.whichfork = XFS_ATTR_FORK;
280 args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
281
282 /* Size is now blocks for attribute data */
283 args.total = xfs_attr_calc_size(dp, name->len, valuelen, &local);
284
285 /*
286 * Start our first transaction of the day.
287 *
288 * All future transactions during this code must be "chained" off
289 * this one via the trans_dup() call. All transactions will contain
290 * the inode, and the inode will always be marked with trans_ihold().
291 * Since the inode will be locked in all transactions, we must log
292 * the inode in every transaction to let it float upward through
293 * the log.
294 */
295 args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_SET);
296
297 /*
298 * Root fork attributes can use reserved data blocks for this
299 * operation if necessary
300 */
301
302 if (rsvd)
303 args.trans->t_flags |= XFS_TRANS_RESERVE;
304
305 if ((error = xfs_trans_reserve(args.trans, args.total,
306 XFS_ATTRSET_LOG_RES(mp, args.total), 0,
307 XFS_TRANS_PERM_LOG_RES, XFS_ATTRSET_LOG_COUNT))) {
308 xfs_trans_cancel(args.trans, 0);
309 return(error);
310 }
311 xfs_ilock(dp, XFS_ILOCK_EXCL);
312
313 error = xfs_trans_reserve_quota_nblks(args.trans, dp, args.total, 0,
314 rsvd ? XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
315 XFS_QMOPT_RES_REGBLKS);
316 if (error) {
317 xfs_iunlock(dp, XFS_ILOCK_EXCL);
318 xfs_trans_cancel(args.trans, XFS_TRANS_RELEASE_LOG_RES);
319 return (error);
320 }
321
322 xfs_trans_ijoin(args.trans, dp, 0);
323
324 /*
325 * If the attribute list is non-existent or a shortform list,
326 * upgrade it to a single-leaf-block attribute list.
327 */
328 if ((dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
329 ((dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS) &&
330 (dp->i_d.di_anextents == 0))) {
331
332 /*
333 * Build initial attribute list (if required).
334 */
335 if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS)
336 xfs_attr_shortform_create(&args);
337
338 /*
339 * Try to add the attr to the attribute list in
340 * the inode.
341 */
342 error = xfs_attr_shortform_addname(&args);
343 if (error != ENOSPC) {
344 /*
345 * Commit the shortform mods, and we're done.
346 * NOTE: this is also the error path (EEXIST, etc).
347 */
348 ASSERT(args.trans != NULL);
349
350 /*
351 * If this is a synchronous mount, make sure that
352 * the transaction goes to disk before returning
353 * to the user.
354 */
355 if (mp->m_flags & XFS_MOUNT_WSYNC) {
356 xfs_trans_set_sync(args.trans);
357 }
358
359 if (!error && (flags & ATTR_KERNOTIME) == 0) {
360 xfs_trans_ichgtime(args.trans, dp,
361 XFS_ICHGTIME_CHG);
362 }
363 err2 = xfs_trans_commit(args.trans,
364 XFS_TRANS_RELEASE_LOG_RES);
365 xfs_iunlock(dp, XFS_ILOCK_EXCL);
366
367 return(error == 0 ? err2 : error);
368 }
369
370 /*
371 * It won't fit in the shortform, transform to a leaf block.
372 * GROT: another possible req'mt for a double-split btree op.
373 */
374 xfs_bmap_init(args.flist, args.firstblock);
375 error = xfs_attr_shortform_to_leaf(&args);
376 if (!error) {
377 error = xfs_bmap_finish(&args.trans, args.flist,
378 &committed);
379 }
380 if (error) {
381 ASSERT(committed);
382 args.trans = NULL;
383 xfs_bmap_cancel(&flist);
384 goto out;
385 }
386
387 /*
388 * bmap_finish() may have committed the last trans and started
389 * a new one. We need the inode to be in all transactions.
390 */
391 if (committed)
392 xfs_trans_ijoin(args.trans, dp, 0);
393
394 /*
395 * Commit the leaf transformation. We'll need another (linked)
396 * transaction to add the new attribute to the leaf.
397 */
398
399 error = xfs_trans_roll(&args.trans, dp);
400 if (error)
401 goto out;
402
403 }
404
405 if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
406 error = xfs_attr_leaf_addname(&args);
407 } else {
408 error = xfs_attr_node_addname(&args);
409 }
410 if (error) {
411 goto out;
412 }
413
414 /*
415 * If this is a synchronous mount, make sure that the
416 * transaction goes to disk before returning to the user.
417 */
418 if (mp->m_flags & XFS_MOUNT_WSYNC) {
419 xfs_trans_set_sync(args.trans);
420 }
421
422 if ((flags & ATTR_KERNOTIME) == 0)
423 xfs_trans_ichgtime(args.trans, dp, XFS_ICHGTIME_CHG);
424
425 /*
426 * Commit the last in the sequence of transactions.
427 */
428 xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
429 error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES);
430 xfs_iunlock(dp, XFS_ILOCK_EXCL);
431
432 return(error);
433
434 out:
435 if (args.trans)
436 xfs_trans_cancel(args.trans,
437 XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
438 xfs_iunlock(dp, XFS_ILOCK_EXCL);
439 return(error);
440 }
441
442 int
443 xfs_attr_set(
444 xfs_inode_t *dp,
445 const unsigned char *name,
446 unsigned char *value,
447 int valuelen,
448 int flags)
449 {
450 int error;
451 struct xfs_name xname;
452
453 XFS_STATS_INC(xs_attr_set);
454
455 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
456 return (EIO);
457
458 error = xfs_attr_name_to_xname(&xname, name);
459 if (error)
460 return error;
461
462 return xfs_attr_set_int(dp, &xname, value, valuelen, flags);
463 }
464
465 /*
466 * Generic handler routine to remove a name from an attribute list.
467 * Transitions attribute list from Btree to shortform as necessary.
468 */
469 STATIC int
470 xfs_attr_remove_int(xfs_inode_t *dp, struct xfs_name *name, int flags)
471 {
472 xfs_da_args_t args;
473 xfs_fsblock_t firstblock;
474 xfs_bmap_free_t flist;
475 int error;
476 xfs_mount_t *mp = dp->i_mount;
477
478 /*
479 * Fill in the arg structure for this request.
480 */
481 memset((char *)&args, 0, sizeof(args));
482 args.name = name->name;
483 args.namelen = name->len;
484 args.flags = flags;
485 args.hashval = xfs_da_hashname(args.name, args.namelen);
486 args.dp = dp;
487 args.firstblock = &firstblock;
488 args.flist = &flist;
489 args.total = 0;
490 args.whichfork = XFS_ATTR_FORK;
491
492 /*
493 * we have no control over the attribute names that userspace passes us
494 * to remove, so we have to allow the name lookup prior to attribute
495 * removal to fail.
496 */
497 args.op_flags = XFS_DA_OP_OKNOENT;
498
499 /*
500 * Attach the dquots to the inode.
501 */
502 error = xfs_qm_dqattach(dp, 0);
503 if (error)
504 return error;
505
506 /*
507 * Start our first transaction of the day.
508 *
509 * All future transactions during this code must be "chained" off
510 * this one via the trans_dup() call. All transactions will contain
511 * the inode, and the inode will always be marked with trans_ihold().
512 * Since the inode will be locked in all transactions, we must log
513 * the inode in every transaction to let it float upward through
514 * the log.
515 */
516 args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_RM);
517
518 /*
519 * Root fork attributes can use reserved data blocks for this
520 * operation if necessary
521 */
522
523 if (flags & ATTR_ROOT)
524 args.trans->t_flags |= XFS_TRANS_RESERVE;
525
526 if ((error = xfs_trans_reserve(args.trans,
527 XFS_ATTRRM_SPACE_RES(mp),
528 XFS_ATTRRM_LOG_RES(mp),
529 0, XFS_TRANS_PERM_LOG_RES,
530 XFS_ATTRRM_LOG_COUNT))) {
531 xfs_trans_cancel(args.trans, 0);
532 return(error);
533 }
534
535 xfs_ilock(dp, XFS_ILOCK_EXCL);
536 /*
537 * No need to make quota reservations here. We expect to release some
538 * blocks not allocate in the common case.
539 */
540 xfs_trans_ijoin(args.trans, dp, 0);
541
542 /*
543 * Decide on what work routines to call based on the inode size.
544 */
545 if (!xfs_inode_hasattr(dp)) {
546 error = XFS_ERROR(ENOATTR);
547 goto out;
548 }
549 if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
550 ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
551 error = xfs_attr_shortform_remove(&args);
552 if (error) {
553 goto out;
554 }
555 } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
556 error = xfs_attr_leaf_removename(&args);
557 } else {
558 error = xfs_attr_node_removename(&args);
559 }
560 if (error) {
561 goto out;
562 }
563
564 /*
565 * If this is a synchronous mount, make sure that the
566 * transaction goes to disk before returning to the user.
567 */
568 if (mp->m_flags & XFS_MOUNT_WSYNC) {
569 xfs_trans_set_sync(args.trans);
570 }
571
572 if ((flags & ATTR_KERNOTIME) == 0)
573 xfs_trans_ichgtime(args.trans, dp, XFS_ICHGTIME_CHG);
574
575 /*
576 * Commit the last in the sequence of transactions.
577 */
578 xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
579 error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES);
580 xfs_iunlock(dp, XFS_ILOCK_EXCL);
581
582 return(error);
583
584 out:
585 if (args.trans)
586 xfs_trans_cancel(args.trans,
587 XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
588 xfs_iunlock(dp, XFS_ILOCK_EXCL);
589 return(error);
590 }
591
592 int
593 xfs_attr_remove(
594 xfs_inode_t *dp,
595 const unsigned char *name,
596 int flags)
597 {
598 int error;
599 struct xfs_name xname;
600
601 XFS_STATS_INC(xs_attr_remove);
602
603 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
604 return (EIO);
605
606 error = xfs_attr_name_to_xname(&xname, name);
607 if (error)
608 return error;
609
610 xfs_ilock(dp, XFS_ILOCK_SHARED);
611 if (!xfs_inode_hasattr(dp)) {
612 xfs_iunlock(dp, XFS_ILOCK_SHARED);
613 return XFS_ERROR(ENOATTR);
614 }
615 xfs_iunlock(dp, XFS_ILOCK_SHARED);
616
617 return xfs_attr_remove_int(dp, &xname, flags);
618 }
619
620 int
621 xfs_attr_list_int(xfs_attr_list_context_t *context)
622 {
623 int error;
624 xfs_inode_t *dp = context->dp;
625
626 XFS_STATS_INC(xs_attr_list);
627
628 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
629 return EIO;
630
631 xfs_ilock(dp, XFS_ILOCK_SHARED);
632
633 /*
634 * Decide on what work routines to call based on the inode size.
635 */
636 if (!xfs_inode_hasattr(dp)) {
637 error = 0;
638 } else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
639 error = xfs_attr_shortform_list(context);
640 } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
641 error = xfs_attr_leaf_list(context);
642 } else {
643 error = xfs_attr_node_list(context);
644 }
645
646 xfs_iunlock(dp, XFS_ILOCK_SHARED);
647
648 return error;
649 }
650
651 #define ATTR_ENTBASESIZE /* minimum bytes used by an attr */ \
652 (((struct attrlist_ent *) 0)->a_name - (char *) 0)
653 #define ATTR_ENTSIZE(namelen) /* actual bytes used by an attr */ \
654 ((ATTR_ENTBASESIZE + (namelen) + 1 + sizeof(u_int32_t)-1) \
655 & ~(sizeof(u_int32_t)-1))
656
657 /*
658 * Format an attribute and copy it out to the user's buffer.
659 * Take care to check values and protect against them changing later,
660 * we may be reading them directly out of a user buffer.
661 */
662 /*ARGSUSED*/
663 STATIC int
664 xfs_attr_put_listent(
665 xfs_attr_list_context_t *context,
666 int flags,
667 unsigned char *name,
668 int namelen,
669 int valuelen,
670 unsigned char *value)
671 {
672 struct attrlist *alist = (struct attrlist *)context->alist;
673 attrlist_ent_t *aep;
674 int arraytop;
675
676 ASSERT(!(context->flags & ATTR_KERNOVAL));
677 ASSERT(context->count >= 0);
678 ASSERT(context->count < (ATTR_MAX_VALUELEN/8));
679 ASSERT(context->firstu >= sizeof(*alist));
680 ASSERT(context->firstu <= context->bufsize);
681
682 /*
683 * Only list entries in the right namespace.
684 */
685 if (((context->flags & ATTR_SECURE) == 0) !=
686 ((flags & XFS_ATTR_SECURE) == 0))
687 return 0;
688 if (((context->flags & ATTR_ROOT) == 0) !=
689 ((flags & XFS_ATTR_ROOT) == 0))
690 return 0;
691
692 arraytop = sizeof(*alist) +
693 context->count * sizeof(alist->al_offset[0]);
694 context->firstu -= ATTR_ENTSIZE(namelen);
695 if (context->firstu < arraytop) {
696 trace_xfs_attr_list_full(context);
697 alist->al_more = 1;
698 context->seen_enough = 1;
699 return 1;
700 }
701
702 aep = (attrlist_ent_t *)&context->alist[context->firstu];
703 aep->a_valuelen = valuelen;
704 memcpy(aep->a_name, name, namelen);
705 aep->a_name[namelen] = 0;
706 alist->al_offset[context->count++] = context->firstu;
707 alist->al_count = context->count;
708 trace_xfs_attr_list_add(context);
709 return 0;
710 }
711
712 /*
713 * Generate a list of extended attribute names and optionally
714 * also value lengths. Positive return value follows the XFS
715 * convention of being an error, zero or negative return code
716 * is the length of the buffer returned (negated), indicating
717 * success.
718 */
719 int
720 xfs_attr_list(
721 xfs_inode_t *dp,
722 char *buffer,
723 int bufsize,
724 int flags,
725 attrlist_cursor_kern_t *cursor)
726 {
727 xfs_attr_list_context_t context;
728 struct attrlist *alist;
729 int error;
730
731 /*
732 * Validate the cursor.
733 */
734 if (cursor->pad1 || cursor->pad2)
735 return(XFS_ERROR(EINVAL));
736 if ((cursor->initted == 0) &&
737 (cursor->hashval || cursor->blkno || cursor->offset))
738 return XFS_ERROR(EINVAL);
739
740 /*
741 * Check for a properly aligned buffer.
742 */
743 if (((long)buffer) & (sizeof(int)-1))
744 return XFS_ERROR(EFAULT);
745 if (flags & ATTR_KERNOVAL)
746 bufsize = 0;
747
748 /*
749 * Initialize the output buffer.
750 */
751 memset(&context, 0, sizeof(context));
752 context.dp = dp;
753 context.cursor = cursor;
754 context.resynch = 1;
755 context.flags = flags;
756 context.alist = buffer;
757 context.bufsize = (bufsize & ~(sizeof(int)-1)); /* align */
758 context.firstu = context.bufsize;
759 context.put_listent = xfs_attr_put_listent;
760
761 alist = (struct attrlist *)context.alist;
762 alist->al_count = 0;
763 alist->al_more = 0;
764 alist->al_offset[0] = context.bufsize;
765
766 error = xfs_attr_list_int(&context);
767 ASSERT(error >= 0);
768 return error;
769 }
770
771 int /* error */
772 xfs_attr_inactive(xfs_inode_t *dp)
773 {
774 xfs_trans_t *trans;
775 xfs_mount_t *mp;
776 int error;
777
778 mp = dp->i_mount;
779 ASSERT(! XFS_NOT_DQATTACHED(mp, dp));
780
781 xfs_ilock(dp, XFS_ILOCK_SHARED);
782 if (!xfs_inode_hasattr(dp) ||
783 dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
784 xfs_iunlock(dp, XFS_ILOCK_SHARED);
785 return 0;
786 }
787 xfs_iunlock(dp, XFS_ILOCK_SHARED);
788
789 /*
790 * Start our first transaction of the day.
791 *
792 * All future transactions during this code must be "chained" off
793 * this one via the trans_dup() call. All transactions will contain
794 * the inode, and the inode will always be marked with trans_ihold().
795 * Since the inode will be locked in all transactions, we must log
796 * the inode in every transaction to let it float upward through
797 * the log.
798 */
799 trans = xfs_trans_alloc(mp, XFS_TRANS_ATTRINVAL);
800 if ((error = xfs_trans_reserve(trans, 0, XFS_ATTRINVAL_LOG_RES(mp), 0,
801 XFS_TRANS_PERM_LOG_RES,
802 XFS_ATTRINVAL_LOG_COUNT))) {
803 xfs_trans_cancel(trans, 0);
804 return(error);
805 }
806 xfs_ilock(dp, XFS_ILOCK_EXCL);
807
808 /*
809 * No need to make quota reservations here. We expect to release some
810 * blocks, not allocate, in the common case.
811 */
812 xfs_trans_ijoin(trans, dp, 0);
813
814 /*
815 * Decide on what work routines to call based on the inode size.
816 */
817 if (!xfs_inode_hasattr(dp) ||
818 dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
819 error = 0;
820 goto out;
821 }
822 error = xfs_attr_root_inactive(&trans, dp);
823 if (error)
824 goto out;
825
826 error = xfs_itruncate_extents(&trans, dp, XFS_ATTR_FORK, 0);
827 if (error)
828 goto out;
829
830 error = xfs_trans_commit(trans, XFS_TRANS_RELEASE_LOG_RES);
831 xfs_iunlock(dp, XFS_ILOCK_EXCL);
832
833 return(error);
834
835 out:
836 xfs_trans_cancel(trans, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
837 xfs_iunlock(dp, XFS_ILOCK_EXCL);
838 return(error);
839 }
840
841
842
843 /*========================================================================
844 * External routines when attribute list is inside the inode
845 *========================================================================*/
846
847 /*
848 * Add a name to the shortform attribute list structure
849 * This is the external routine.
850 */
851 STATIC int
852 xfs_attr_shortform_addname(xfs_da_args_t *args)
853 {
854 int newsize, forkoff, retval;
855
856 retval = xfs_attr_shortform_lookup(args);
857 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
858 return(retval);
859 } else if (retval == EEXIST) {
860 if (args->flags & ATTR_CREATE)
861 return(retval);
862 retval = xfs_attr_shortform_remove(args);
863 ASSERT(retval == 0);
864 }
865
866 if (args->namelen >= XFS_ATTR_SF_ENTSIZE_MAX ||
867 args->valuelen >= XFS_ATTR_SF_ENTSIZE_MAX)
868 return(XFS_ERROR(ENOSPC));
869
870 newsize = XFS_ATTR_SF_TOTSIZE(args->dp);
871 newsize += XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
872
873 forkoff = xfs_attr_shortform_bytesfit(args->dp, newsize);
874 if (!forkoff)
875 return(XFS_ERROR(ENOSPC));
876
877 xfs_attr_shortform_add(args, forkoff);
878 return(0);
879 }
880
881
882 /*========================================================================
883 * External routines when attribute list is one block
884 *========================================================================*/
885
886 /*
887 * Add a name to the leaf attribute list structure
888 *
889 * This leaf block cannot have a "remote" value, we only call this routine
890 * if bmap_one_block() says there is only one block (ie: no remote blks).
891 */
892 STATIC int
893 xfs_attr_leaf_addname(xfs_da_args_t *args)
894 {
895 xfs_inode_t *dp;
896 xfs_dabuf_t *bp;
897 int retval, error, committed, forkoff;
898
899 /*
900 * Read the (only) block in the attribute list in.
901 */
902 dp = args->dp;
903 args->blkno = 0;
904 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
905 XFS_ATTR_FORK);
906 if (error)
907 return(error);
908 ASSERT(bp != NULL);
909
910 /*
911 * Look up the given attribute in the leaf block. Figure out if
912 * the given flags produce an error or call for an atomic rename.
913 */
914 retval = xfs_attr_leaf_lookup_int(bp, args);
915 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
916 xfs_da_brelse(args->trans, bp);
917 return(retval);
918 } else if (retval == EEXIST) {
919 if (args->flags & ATTR_CREATE) { /* pure create op */
920 xfs_da_brelse(args->trans, bp);
921 return(retval);
922 }
923 args->op_flags |= XFS_DA_OP_RENAME; /* an atomic rename */
924 args->blkno2 = args->blkno; /* set 2nd entry info*/
925 args->index2 = args->index;
926 args->rmtblkno2 = args->rmtblkno;
927 args->rmtblkcnt2 = args->rmtblkcnt;
928 }
929
930 /*
931 * Add the attribute to the leaf block, transitioning to a Btree
932 * if required.
933 */
934 retval = xfs_attr_leaf_add(bp, args);
935 xfs_da_buf_done(bp);
936 if (retval == ENOSPC) {
937 /*
938 * Promote the attribute list to the Btree format, then
939 * Commit that transaction so that the node_addname() call
940 * can manage its own transactions.
941 */
942 xfs_bmap_init(args->flist, args->firstblock);
943 error = xfs_attr_leaf_to_node(args);
944 if (!error) {
945 error = xfs_bmap_finish(&args->trans, args->flist,
946 &committed);
947 }
948 if (error) {
949 ASSERT(committed);
950 args->trans = NULL;
951 xfs_bmap_cancel(args->flist);
952 return(error);
953 }
954
955 /*
956 * bmap_finish() may have committed the last trans and started
957 * a new one. We need the inode to be in all transactions.
958 */
959 if (committed)
960 xfs_trans_ijoin(args->trans, dp, 0);
961
962 /*
963 * Commit the current trans (including the inode) and start
964 * a new one.
965 */
966 error = xfs_trans_roll(&args->trans, dp);
967 if (error)
968 return (error);
969
970 /*
971 * Fob the whole rest of the problem off on the Btree code.
972 */
973 error = xfs_attr_node_addname(args);
974 return(error);
975 }
976
977 /*
978 * Commit the transaction that added the attr name so that
979 * later routines can manage their own transactions.
980 */
981 error = xfs_trans_roll(&args->trans, dp);
982 if (error)
983 return (error);
984
985 /*
986 * If there was an out-of-line value, allocate the blocks we
987 * identified for its storage and copy the value. This is done
988 * after we create the attribute so that we don't overflow the
989 * maximum size of a transaction and/or hit a deadlock.
990 */
991 if (args->rmtblkno > 0) {
992 error = xfs_attr_rmtval_set(args);
993 if (error)
994 return(error);
995 }
996
997 /*
998 * If this is an atomic rename operation, we must "flip" the
999 * incomplete flags on the "new" and "old" attribute/value pairs
1000 * so that one disappears and one appears atomically. Then we
1001 * must remove the "old" attribute/value pair.
1002 */
1003 if (args->op_flags & XFS_DA_OP_RENAME) {
1004 /*
1005 * In a separate transaction, set the incomplete flag on the
1006 * "old" attr and clear the incomplete flag on the "new" attr.
1007 */
1008 error = xfs_attr_leaf_flipflags(args);
1009 if (error)
1010 return(error);
1011
1012 /*
1013 * Dismantle the "old" attribute/value pair by removing
1014 * a "remote" value (if it exists).
1015 */
1016 args->index = args->index2;
1017 args->blkno = args->blkno2;
1018 args->rmtblkno = args->rmtblkno2;
1019 args->rmtblkcnt = args->rmtblkcnt2;
1020 if (args->rmtblkno) {
1021 error = xfs_attr_rmtval_remove(args);
1022 if (error)
1023 return(error);
1024 }
1025
1026 /*
1027 * Read in the block containing the "old" attr, then
1028 * remove the "old" attr from that block (neat, huh!)
1029 */
1030 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1,
1031 &bp, XFS_ATTR_FORK);
1032 if (error)
1033 return(error);
1034 ASSERT(bp != NULL);
1035 (void)xfs_attr_leaf_remove(bp, args);
1036
1037 /*
1038 * If the result is small enough, shrink it all into the inode.
1039 */
1040 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1041 xfs_bmap_init(args->flist, args->firstblock);
1042 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1043 /* bp is gone due to xfs_da_shrink_inode */
1044 if (!error) {
1045 error = xfs_bmap_finish(&args->trans,
1046 args->flist,
1047 &committed);
1048 }
1049 if (error) {
1050 ASSERT(committed);
1051 args->trans = NULL;
1052 xfs_bmap_cancel(args->flist);
1053 return(error);
1054 }
1055
1056 /*
1057 * bmap_finish() may have committed the last trans
1058 * and started a new one. We need the inode to be
1059 * in all transactions.
1060 */
1061 if (committed)
1062 xfs_trans_ijoin(args->trans, dp, 0);
1063 } else
1064 xfs_da_buf_done(bp);
1065
1066 /*
1067 * Commit the remove and start the next trans in series.
1068 */
1069 error = xfs_trans_roll(&args->trans, dp);
1070
1071 } else if (args->rmtblkno > 0) {
1072 /*
1073 * Added a "remote" value, just clear the incomplete flag.
1074 */
1075 error = xfs_attr_leaf_clearflag(args);
1076 }
1077 return(error);
1078 }
1079
1080 /*
1081 * Remove a name from the leaf attribute list structure
1082 *
1083 * This leaf block cannot have a "remote" value, we only call this routine
1084 * if bmap_one_block() says there is only one block (ie: no remote blks).
1085 */
1086 STATIC int
1087 xfs_attr_leaf_removename(xfs_da_args_t *args)
1088 {
1089 xfs_inode_t *dp;
1090 xfs_dabuf_t *bp;
1091 int error, committed, forkoff;
1092
1093 /*
1094 * Remove the attribute.
1095 */
1096 dp = args->dp;
1097 args->blkno = 0;
1098 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
1099 XFS_ATTR_FORK);
1100 if (error) {
1101 return(error);
1102 }
1103
1104 ASSERT(bp != NULL);
1105 error = xfs_attr_leaf_lookup_int(bp, args);
1106 if (error == ENOATTR) {
1107 xfs_da_brelse(args->trans, bp);
1108 return(error);
1109 }
1110
1111 (void)xfs_attr_leaf_remove(bp, args);
1112
1113 /*
1114 * If the result is small enough, shrink it all into the inode.
1115 */
1116 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1117 xfs_bmap_init(args->flist, args->firstblock);
1118 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1119 /* bp is gone due to xfs_da_shrink_inode */
1120 if (!error) {
1121 error = xfs_bmap_finish(&args->trans, args->flist,
1122 &committed);
1123 }
1124 if (error) {
1125 ASSERT(committed);
1126 args->trans = NULL;
1127 xfs_bmap_cancel(args->flist);
1128 return(error);
1129 }
1130
1131 /*
1132 * bmap_finish() may have committed the last trans and started
1133 * a new one. We need the inode to be in all transactions.
1134 */
1135 if (committed)
1136 xfs_trans_ijoin(args->trans, dp, 0);
1137 } else
1138 xfs_da_buf_done(bp);
1139 return(0);
1140 }
1141
1142 /*
1143 * Look up a name in a leaf attribute list structure.
1144 *
1145 * This leaf block cannot have a "remote" value, we only call this routine
1146 * if bmap_one_block() says there is only one block (ie: no remote blks).
1147 */
1148 STATIC int
1149 xfs_attr_leaf_get(xfs_da_args_t *args)
1150 {
1151 xfs_dabuf_t *bp;
1152 int error;
1153
1154 args->blkno = 0;
1155 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
1156 XFS_ATTR_FORK);
1157 if (error)
1158 return(error);
1159 ASSERT(bp != NULL);
1160
1161 error = xfs_attr_leaf_lookup_int(bp, args);
1162 if (error != EEXIST) {
1163 xfs_da_brelse(args->trans, bp);
1164 return(error);
1165 }
1166 error = xfs_attr_leaf_getvalue(bp, args);
1167 xfs_da_brelse(args->trans, bp);
1168 if (!error && (args->rmtblkno > 0) && !(args->flags & ATTR_KERNOVAL)) {
1169 error = xfs_attr_rmtval_get(args);
1170 }
1171 return(error);
1172 }
1173
1174 /*
1175 * Copy out attribute entries for attr_list(), for leaf attribute lists.
1176 */
1177 STATIC int
1178 xfs_attr_leaf_list(xfs_attr_list_context_t *context)
1179 {
1180 xfs_attr_leafblock_t *leaf;
1181 int error;
1182 xfs_dabuf_t *bp;
1183
1184 context->cursor->blkno = 0;
1185 error = xfs_da_read_buf(NULL, context->dp, 0, -1, &bp, XFS_ATTR_FORK);
1186 if (error)
1187 return XFS_ERROR(error);
1188 ASSERT(bp != NULL);
1189 leaf = bp->data;
1190 if (unlikely(leaf->hdr.info.magic != cpu_to_be16(XFS_ATTR_LEAF_MAGIC))) {
1191 XFS_CORRUPTION_ERROR("xfs_attr_leaf_list", XFS_ERRLEVEL_LOW,
1192 context->dp->i_mount, leaf);
1193 xfs_da_brelse(NULL, bp);
1194 return XFS_ERROR(EFSCORRUPTED);
1195 }
1196
1197 error = xfs_attr_leaf_list_int(bp, context);
1198 xfs_da_brelse(NULL, bp);
1199 return XFS_ERROR(error);
1200 }
1201
1202
1203 /*========================================================================
1204 * External routines when attribute list size > XFS_LBSIZE(mp).
1205 *========================================================================*/
1206
1207 /*
1208 * Add a name to a Btree-format attribute list.
1209 *
1210 * This will involve walking down the Btree, and may involve splitting
1211 * leaf nodes and even splitting intermediate nodes up to and including
1212 * the root node (a special case of an intermediate node).
1213 *
1214 * "Remote" attribute values confuse the issue and atomic rename operations
1215 * add a whole extra layer of confusion on top of that.
1216 */
1217 STATIC int
1218 xfs_attr_node_addname(xfs_da_args_t *args)
1219 {
1220 xfs_da_state_t *state;
1221 xfs_da_state_blk_t *blk;
1222 xfs_inode_t *dp;
1223 xfs_mount_t *mp;
1224 int committed, retval, error;
1225
1226 /*
1227 * Fill in bucket of arguments/results/context to carry around.
1228 */
1229 dp = args->dp;
1230 mp = dp->i_mount;
1231 restart:
1232 state = xfs_da_state_alloc();
1233 state->args = args;
1234 state->mp = mp;
1235 state->blocksize = state->mp->m_sb.sb_blocksize;
1236 state->node_ents = state->mp->m_attr_node_ents;
1237
1238 /*
1239 * Search to see if name already exists, and get back a pointer
1240 * to where it should go.
1241 */
1242 error = xfs_da_node_lookup_int(state, &retval);
1243 if (error)
1244 goto out;
1245 blk = &state->path.blk[ state->path.active-1 ];
1246 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1247 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
1248 goto out;
1249 } else if (retval == EEXIST) {
1250 if (args->flags & ATTR_CREATE)
1251 goto out;
1252 args->op_flags |= XFS_DA_OP_RENAME; /* atomic rename op */
1253 args->blkno2 = args->blkno; /* set 2nd entry info*/
1254 args->index2 = args->index;
1255 args->rmtblkno2 = args->rmtblkno;
1256 args->rmtblkcnt2 = args->rmtblkcnt;
1257 args->rmtblkno = 0;
1258 args->rmtblkcnt = 0;
1259 }
1260
1261 retval = xfs_attr_leaf_add(blk->bp, state->args);
1262 if (retval == ENOSPC) {
1263 if (state->path.active == 1) {
1264 /*
1265 * Its really a single leaf node, but it had
1266 * out-of-line values so it looked like it *might*
1267 * have been a b-tree.
1268 */
1269 xfs_da_state_free(state);
1270 xfs_bmap_init(args->flist, args->firstblock);
1271 error = xfs_attr_leaf_to_node(args);
1272 if (!error) {
1273 error = xfs_bmap_finish(&args->trans,
1274 args->flist,
1275 &committed);
1276 }
1277 if (error) {
1278 ASSERT(committed);
1279 args->trans = NULL;
1280 xfs_bmap_cancel(args->flist);
1281 goto out;
1282 }
1283
1284 /*
1285 * bmap_finish() may have committed the last trans
1286 * and started a new one. We need the inode to be
1287 * in all transactions.
1288 */
1289 if (committed)
1290 xfs_trans_ijoin(args->trans, dp, 0);
1291
1292 /*
1293 * Commit the node conversion and start the next
1294 * trans in the chain.
1295 */
1296 error = xfs_trans_roll(&args->trans, dp);
1297 if (error)
1298 goto out;
1299
1300 goto restart;
1301 }
1302
1303 /*
1304 * Split as many Btree elements as required.
1305 * This code tracks the new and old attr's location
1306 * in the index/blkno/rmtblkno/rmtblkcnt fields and
1307 * in the index2/blkno2/rmtblkno2/rmtblkcnt2 fields.
1308 */
1309 xfs_bmap_init(args->flist, args->firstblock);
1310 error = xfs_da_split(state);
1311 if (!error) {
1312 error = xfs_bmap_finish(&args->trans, args->flist,
1313 &committed);
1314 }
1315 if (error) {
1316 ASSERT(committed);
1317 args->trans = NULL;
1318 xfs_bmap_cancel(args->flist);
1319 goto out;
1320 }
1321
1322 /*
1323 * bmap_finish() may have committed the last trans and started
1324 * a new one. We need the inode to be in all transactions.
1325 */
1326 if (committed)
1327 xfs_trans_ijoin(args->trans, dp, 0);
1328 } else {
1329 /*
1330 * Addition succeeded, update Btree hashvals.
1331 */
1332 xfs_da_fixhashpath(state, &state->path);
1333 }
1334
1335 /*
1336 * Kill the state structure, we're done with it and need to
1337 * allow the buffers to come back later.
1338 */
1339 xfs_da_state_free(state);
1340 state = NULL;
1341
1342 /*
1343 * Commit the leaf addition or btree split and start the next
1344 * trans in the chain.
1345 */
1346 error = xfs_trans_roll(&args->trans, dp);
1347 if (error)
1348 goto out;
1349
1350 /*
1351 * If there was an out-of-line value, allocate the blocks we
1352 * identified for its storage and copy the value. This is done
1353 * after we create the attribute so that we don't overflow the
1354 * maximum size of a transaction and/or hit a deadlock.
1355 */
1356 if (args->rmtblkno > 0) {
1357 error = xfs_attr_rmtval_set(args);
1358 if (error)
1359 return(error);
1360 }
1361
1362 /*
1363 * If this is an atomic rename operation, we must "flip" the
1364 * incomplete flags on the "new" and "old" attribute/value pairs
1365 * so that one disappears and one appears atomically. Then we
1366 * must remove the "old" attribute/value pair.
1367 */
1368 if (args->op_flags & XFS_DA_OP_RENAME) {
1369 /*
1370 * In a separate transaction, set the incomplete flag on the
1371 * "old" attr and clear the incomplete flag on the "new" attr.
1372 */
1373 error = xfs_attr_leaf_flipflags(args);
1374 if (error)
1375 goto out;
1376
1377 /*
1378 * Dismantle the "old" attribute/value pair by removing
1379 * a "remote" value (if it exists).
1380 */
1381 args->index = args->index2;
1382 args->blkno = args->blkno2;
1383 args->rmtblkno = args->rmtblkno2;
1384 args->rmtblkcnt = args->rmtblkcnt2;
1385 if (args->rmtblkno) {
1386 error = xfs_attr_rmtval_remove(args);
1387 if (error)
1388 return(error);
1389 }
1390
1391 /*
1392 * Re-find the "old" attribute entry after any split ops.
1393 * The INCOMPLETE flag means that we will find the "old"
1394 * attr, not the "new" one.
1395 */
1396 args->flags |= XFS_ATTR_INCOMPLETE;
1397 state = xfs_da_state_alloc();
1398 state->args = args;
1399 state->mp = mp;
1400 state->blocksize = state->mp->m_sb.sb_blocksize;
1401 state->node_ents = state->mp->m_attr_node_ents;
1402 state->inleaf = 0;
1403 error = xfs_da_node_lookup_int(state, &retval);
1404 if (error)
1405 goto out;
1406
1407 /*
1408 * Remove the name and update the hashvals in the tree.
1409 */
1410 blk = &state->path.blk[ state->path.active-1 ];
1411 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1412 error = xfs_attr_leaf_remove(blk->bp, args);
1413 xfs_da_fixhashpath(state, &state->path);
1414
1415 /*
1416 * Check to see if the tree needs to be collapsed.
1417 */
1418 if (retval && (state->path.active > 1)) {
1419 xfs_bmap_init(args->flist, args->firstblock);
1420 error = xfs_da_join(state);
1421 if (!error) {
1422 error = xfs_bmap_finish(&args->trans,
1423 args->flist,
1424 &committed);
1425 }
1426 if (error) {
1427 ASSERT(committed);
1428 args->trans = NULL;
1429 xfs_bmap_cancel(args->flist);
1430 goto out;
1431 }
1432
1433 /*
1434 * bmap_finish() may have committed the last trans
1435 * and started a new one. We need the inode to be
1436 * in all transactions.
1437 */
1438 if (committed)
1439 xfs_trans_ijoin(args->trans, dp, 0);
1440 }
1441
1442 /*
1443 * Commit and start the next trans in the chain.
1444 */
1445 error = xfs_trans_roll(&args->trans, dp);
1446 if (error)
1447 goto out;
1448
1449 } else if (args->rmtblkno > 0) {
1450 /*
1451 * Added a "remote" value, just clear the incomplete flag.
1452 */
1453 error = xfs_attr_leaf_clearflag(args);
1454 if (error)
1455 goto out;
1456 }
1457 retval = error = 0;
1458
1459 out:
1460 if (state)
1461 xfs_da_state_free(state);
1462 if (error)
1463 return(error);
1464 return(retval);
1465 }
1466
1467 /*
1468 * Remove a name from a B-tree attribute list.
1469 *
1470 * This will involve walking down the Btree, and may involve joining
1471 * leaf nodes and even joining intermediate nodes up to and including
1472 * the root node (a special case of an intermediate node).
1473 */
1474 STATIC int
1475 xfs_attr_node_removename(xfs_da_args_t *args)
1476 {
1477 xfs_da_state_t *state;
1478 xfs_da_state_blk_t *blk;
1479 xfs_inode_t *dp;
1480 xfs_dabuf_t *bp;
1481 int retval, error, committed, forkoff;
1482
1483 /*
1484 * Tie a string around our finger to remind us where we are.
1485 */
1486 dp = args->dp;
1487 state = xfs_da_state_alloc();
1488 state->args = args;
1489 state->mp = dp->i_mount;
1490 state->blocksize = state->mp->m_sb.sb_blocksize;
1491 state->node_ents = state->mp->m_attr_node_ents;
1492
1493 /*
1494 * Search to see if name exists, and get back a pointer to it.
1495 */
1496 error = xfs_da_node_lookup_int(state, &retval);
1497 if (error || (retval != EEXIST)) {
1498 if (error == 0)
1499 error = retval;
1500 goto out;
1501 }
1502
1503 /*
1504 * If there is an out-of-line value, de-allocate the blocks.
1505 * This is done before we remove the attribute so that we don't
1506 * overflow the maximum size of a transaction and/or hit a deadlock.
1507 */
1508 blk = &state->path.blk[ state->path.active-1 ];
1509 ASSERT(blk->bp != NULL);
1510 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1511 if (args->rmtblkno > 0) {
1512 /*
1513 * Fill in disk block numbers in the state structure
1514 * so that we can get the buffers back after we commit
1515 * several transactions in the following calls.
1516 */
1517 error = xfs_attr_fillstate(state);
1518 if (error)
1519 goto out;
1520
1521 /*
1522 * Mark the attribute as INCOMPLETE, then bunmapi() the
1523 * remote value.
1524 */
1525 error = xfs_attr_leaf_setflag(args);
1526 if (error)
1527 goto out;
1528 error = xfs_attr_rmtval_remove(args);
1529 if (error)
1530 goto out;
1531
1532 /*
1533 * Refill the state structure with buffers, the prior calls
1534 * released our buffers.
1535 */
1536 error = xfs_attr_refillstate(state);
1537 if (error)
1538 goto out;
1539 }
1540
1541 /*
1542 * Remove the name and update the hashvals in the tree.
1543 */
1544 blk = &state->path.blk[ state->path.active-1 ];
1545 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1546 retval = xfs_attr_leaf_remove(blk->bp, args);
1547 xfs_da_fixhashpath(state, &state->path);
1548
1549 /*
1550 * Check to see if the tree needs to be collapsed.
1551 */
1552 if (retval && (state->path.active > 1)) {
1553 xfs_bmap_init(args->flist, args->firstblock);
1554 error = xfs_da_join(state);
1555 if (!error) {
1556 error = xfs_bmap_finish(&args->trans, args->flist,
1557 &committed);
1558 }
1559 if (error) {
1560 ASSERT(committed);
1561 args->trans = NULL;
1562 xfs_bmap_cancel(args->flist);
1563 goto out;
1564 }
1565
1566 /*
1567 * bmap_finish() may have committed the last trans and started
1568 * a new one. We need the inode to be in all transactions.
1569 */
1570 if (committed)
1571 xfs_trans_ijoin(args->trans, dp, 0);
1572
1573 /*
1574 * Commit the Btree join operation and start a new trans.
1575 */
1576 error = xfs_trans_roll(&args->trans, dp);
1577 if (error)
1578 goto out;
1579 }
1580
1581 /*
1582 * If the result is small enough, push it all into the inode.
1583 */
1584 if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
1585 /*
1586 * Have to get rid of the copy of this dabuf in the state.
1587 */
1588 ASSERT(state->path.active == 1);
1589 ASSERT(state->path.blk[0].bp);
1590 xfs_da_buf_done(state->path.blk[0].bp);
1591 state->path.blk[0].bp = NULL;
1592
1593 error = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp,
1594 XFS_ATTR_FORK);
1595 if (error)
1596 goto out;
1597 ASSERT((((xfs_attr_leafblock_t *)bp->data)->hdr.info.magic) ==
1598 cpu_to_be16(XFS_ATTR_LEAF_MAGIC));
1599
1600 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1601 xfs_bmap_init(args->flist, args->firstblock);
1602 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1603 /* bp is gone due to xfs_da_shrink_inode */
1604 if (!error) {
1605 error = xfs_bmap_finish(&args->trans,
1606 args->flist,
1607 &committed);
1608 }
1609 if (error) {
1610 ASSERT(committed);
1611 args->trans = NULL;
1612 xfs_bmap_cancel(args->flist);
1613 goto out;
1614 }
1615
1616 /*
1617 * bmap_finish() may have committed the last trans
1618 * and started a new one. We need the inode to be
1619 * in all transactions.
1620 */
1621 if (committed)
1622 xfs_trans_ijoin(args->trans, dp, 0);
1623 } else
1624 xfs_da_brelse(args->trans, bp);
1625 }
1626 error = 0;
1627
1628 out:
1629 xfs_da_state_free(state);
1630 return(error);
1631 }
1632
1633 /*
1634 * Fill in the disk block numbers in the state structure for the buffers
1635 * that are attached to the state structure.
1636 * This is done so that we can quickly reattach ourselves to those buffers
1637 * after some set of transaction commits have released these buffers.
1638 */
1639 STATIC int
1640 xfs_attr_fillstate(xfs_da_state_t *state)
1641 {
1642 xfs_da_state_path_t *path;
1643 xfs_da_state_blk_t *blk;
1644 int level;
1645
1646 /*
1647 * Roll down the "path" in the state structure, storing the on-disk
1648 * block number for those buffers in the "path".
1649 */
1650 path = &state->path;
1651 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1652 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1653 if (blk->bp) {
1654 blk->disk_blkno = xfs_da_blkno(blk->bp);
1655 xfs_da_buf_done(blk->bp);
1656 blk->bp = NULL;
1657 } else {
1658 blk->disk_blkno = 0;
1659 }
1660 }
1661
1662 /*
1663 * Roll down the "altpath" in the state structure, storing the on-disk
1664 * block number for those buffers in the "altpath".
1665 */
1666 path = &state->altpath;
1667 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1668 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1669 if (blk->bp) {
1670 blk->disk_blkno = xfs_da_blkno(blk->bp);
1671 xfs_da_buf_done(blk->bp);
1672 blk->bp = NULL;
1673 } else {
1674 blk->disk_blkno = 0;
1675 }
1676 }
1677
1678 return(0);
1679 }
1680
1681 /*
1682 * Reattach the buffers to the state structure based on the disk block
1683 * numbers stored in the state structure.
1684 * This is done after some set of transaction commits have released those
1685 * buffers from our grip.
1686 */
1687 STATIC int
1688 xfs_attr_refillstate(xfs_da_state_t *state)
1689 {
1690 xfs_da_state_path_t *path;
1691 xfs_da_state_blk_t *blk;
1692 int level, error;
1693
1694 /*
1695 * Roll down the "path" in the state structure, storing the on-disk
1696 * block number for those buffers in the "path".
1697 */
1698 path = &state->path;
1699 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1700 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1701 if (blk->disk_blkno) {
1702 error = xfs_da_read_buf(state->args->trans,
1703 state->args->dp,
1704 blk->blkno, blk->disk_blkno,
1705 &blk->bp, XFS_ATTR_FORK);
1706 if (error)
1707 return(error);
1708 } else {
1709 blk->bp = NULL;
1710 }
1711 }
1712
1713 /*
1714 * Roll down the "altpath" in the state structure, storing the on-disk
1715 * block number for those buffers in the "altpath".
1716 */
1717 path = &state->altpath;
1718 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1719 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1720 if (blk->disk_blkno) {
1721 error = xfs_da_read_buf(state->args->trans,
1722 state->args->dp,
1723 blk->blkno, blk->disk_blkno,
1724 &blk->bp, XFS_ATTR_FORK);
1725 if (error)
1726 return(error);
1727 } else {
1728 blk->bp = NULL;
1729 }
1730 }
1731
1732 return(0);
1733 }
1734
1735 /*
1736 * Look up a filename in a node attribute list.
1737 *
1738 * This routine gets called for any attribute fork that has more than one
1739 * block, ie: both true Btree attr lists and for single-leaf-blocks with
1740 * "remote" values taking up more blocks.
1741 */
1742 STATIC int
1743 xfs_attr_node_get(xfs_da_args_t *args)
1744 {
1745 xfs_da_state_t *state;
1746 xfs_da_state_blk_t *blk;
1747 int error, retval;
1748 int i;
1749
1750 state = xfs_da_state_alloc();
1751 state->args = args;
1752 state->mp = args->dp->i_mount;
1753 state->blocksize = state->mp->m_sb.sb_blocksize;
1754 state->node_ents = state->mp->m_attr_node_ents;
1755
1756 /*
1757 * Search to see if name exists, and get back a pointer to it.
1758 */
1759 error = xfs_da_node_lookup_int(state, &retval);
1760 if (error) {
1761 retval = error;
1762 } else if (retval == EEXIST) {
1763 blk = &state->path.blk[ state->path.active-1 ];
1764 ASSERT(blk->bp != NULL);
1765 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1766
1767 /*
1768 * Get the value, local or "remote"
1769 */
1770 retval = xfs_attr_leaf_getvalue(blk->bp, args);
1771 if (!retval && (args->rmtblkno > 0)
1772 && !(args->flags & ATTR_KERNOVAL)) {
1773 retval = xfs_attr_rmtval_get(args);
1774 }
1775 }
1776
1777 /*
1778 * If not in a transaction, we have to release all the buffers.
1779 */
1780 for (i = 0; i < state->path.active; i++) {
1781 xfs_da_brelse(args->trans, state->path.blk[i].bp);
1782 state->path.blk[i].bp = NULL;
1783 }
1784
1785 xfs_da_state_free(state);
1786 return(retval);
1787 }
1788
1789 STATIC int /* error */
1790 xfs_attr_node_list(xfs_attr_list_context_t *context)
1791 {
1792 attrlist_cursor_kern_t *cursor;
1793 xfs_attr_leafblock_t *leaf;
1794 xfs_da_intnode_t *node;
1795 xfs_da_node_entry_t *btree;
1796 int error, i;
1797 xfs_dabuf_t *bp;
1798
1799 cursor = context->cursor;
1800 cursor->initted = 1;
1801
1802 /*
1803 * Do all sorts of validation on the passed-in cursor structure.
1804 * If anything is amiss, ignore the cursor and look up the hashval
1805 * starting from the btree root.
1806 */
1807 bp = NULL;
1808 if (cursor->blkno > 0) {
1809 error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
1810 &bp, XFS_ATTR_FORK);
1811 if ((error != 0) && (error != EFSCORRUPTED))
1812 return(error);
1813 if (bp) {
1814 node = bp->data;
1815 switch (be16_to_cpu(node->hdr.info.magic)) {
1816 case XFS_DA_NODE_MAGIC:
1817 trace_xfs_attr_list_wrong_blk(context);
1818 xfs_da_brelse(NULL, bp);
1819 bp = NULL;
1820 break;
1821 case XFS_ATTR_LEAF_MAGIC:
1822 leaf = bp->data;
1823 if (cursor->hashval > be32_to_cpu(leaf->entries[
1824 be16_to_cpu(leaf->hdr.count)-1].hashval)) {
1825 trace_xfs_attr_list_wrong_blk(context);
1826 xfs_da_brelse(NULL, bp);
1827 bp = NULL;
1828 } else if (cursor->hashval <=
1829 be32_to_cpu(leaf->entries[0].hashval)) {
1830 trace_xfs_attr_list_wrong_blk(context);
1831 xfs_da_brelse(NULL, bp);
1832 bp = NULL;
1833 }
1834 break;
1835 default:
1836 trace_xfs_attr_list_wrong_blk(context);
1837 xfs_da_brelse(NULL, bp);
1838 bp = NULL;
1839 }
1840 }
1841 }
1842
1843 /*
1844 * We did not find what we expected given the cursor's contents,
1845 * so we start from the top and work down based on the hash value.
1846 * Note that start of node block is same as start of leaf block.
1847 */
1848 if (bp == NULL) {
1849 cursor->blkno = 0;
1850 for (;;) {
1851 error = xfs_da_read_buf(NULL, context->dp,
1852 cursor->blkno, -1, &bp,
1853 XFS_ATTR_FORK);
1854 if (error)
1855 return(error);
1856 if (unlikely(bp == NULL)) {
1857 XFS_ERROR_REPORT("xfs_attr_node_list(2)",
1858 XFS_ERRLEVEL_LOW,
1859 context->dp->i_mount);
1860 return(XFS_ERROR(EFSCORRUPTED));
1861 }
1862 node = bp->data;
1863 if (node->hdr.info.magic ==
1864 cpu_to_be16(XFS_ATTR_LEAF_MAGIC))
1865 break;
1866 if (unlikely(node->hdr.info.magic !=
1867 cpu_to_be16(XFS_DA_NODE_MAGIC))) {
1868 XFS_CORRUPTION_ERROR("xfs_attr_node_list(3)",
1869 XFS_ERRLEVEL_LOW,
1870 context->dp->i_mount,
1871 node);
1872 xfs_da_brelse(NULL, bp);
1873 return(XFS_ERROR(EFSCORRUPTED));
1874 }
1875 btree = node->btree;
1876 for (i = 0; i < be16_to_cpu(node->hdr.count);
1877 btree++, i++) {
1878 if (cursor->hashval
1879 <= be32_to_cpu(btree->hashval)) {
1880 cursor->blkno = be32_to_cpu(btree->before);
1881 trace_xfs_attr_list_node_descend(context,
1882 btree);
1883 break;
1884 }
1885 }
1886 if (i == be16_to_cpu(node->hdr.count)) {
1887 xfs_da_brelse(NULL, bp);
1888 return(0);
1889 }
1890 xfs_da_brelse(NULL, bp);
1891 }
1892 }
1893 ASSERT(bp != NULL);
1894
1895 /*
1896 * Roll upward through the blocks, processing each leaf block in
1897 * order. As long as there is space in the result buffer, keep
1898 * adding the information.
1899 */
1900 for (;;) {
1901 leaf = bp->data;
1902 if (unlikely(leaf->hdr.info.magic !=
1903 cpu_to_be16(XFS_ATTR_LEAF_MAGIC))) {
1904 XFS_CORRUPTION_ERROR("xfs_attr_node_list(4)",
1905 XFS_ERRLEVEL_LOW,
1906 context->dp->i_mount, leaf);
1907 xfs_da_brelse(NULL, bp);
1908 return(XFS_ERROR(EFSCORRUPTED));
1909 }
1910 error = xfs_attr_leaf_list_int(bp, context);
1911 if (error) {
1912 xfs_da_brelse(NULL, bp);
1913 return error;
1914 }
1915 if (context->seen_enough || leaf->hdr.info.forw == 0)
1916 break;
1917 cursor->blkno = be32_to_cpu(leaf->hdr.info.forw);
1918 xfs_da_brelse(NULL, bp);
1919 error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
1920 &bp, XFS_ATTR_FORK);
1921 if (error)
1922 return(error);
1923 if (unlikely((bp == NULL))) {
1924 XFS_ERROR_REPORT("xfs_attr_node_list(5)",
1925 XFS_ERRLEVEL_LOW,
1926 context->dp->i_mount);
1927 return(XFS_ERROR(EFSCORRUPTED));
1928 }
1929 }
1930 xfs_da_brelse(NULL, bp);
1931 return(0);
1932 }
1933
1934
1935 /*========================================================================
1936 * External routines for manipulating out-of-line attribute values.
1937 *========================================================================*/
1938
1939 /*
1940 * Read the value associated with an attribute from the out-of-line buffer
1941 * that we stored it in.
1942 */
1943 int
1944 xfs_attr_rmtval_get(xfs_da_args_t *args)
1945 {
1946 xfs_bmbt_irec_t map[ATTR_RMTVALUE_MAPSIZE];
1947 xfs_mount_t *mp;
1948 xfs_daddr_t dblkno;
1949 void *dst;
1950 xfs_buf_t *bp;
1951 int nmap, error, tmp, valuelen, blkcnt, i;
1952 xfs_dablk_t lblkno;
1953
1954 ASSERT(!(args->flags & ATTR_KERNOVAL));
1955
1956 mp = args->dp->i_mount;
1957 dst = args->value;
1958 valuelen = args->valuelen;
1959 lblkno = args->rmtblkno;
1960 while (valuelen > 0) {
1961 nmap = ATTR_RMTVALUE_MAPSIZE;
1962 error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno,
1963 args->rmtblkcnt, map, &nmap,
1964 XFS_BMAPI_ATTRFORK);
1965 if (error)
1966 return(error);
1967 ASSERT(nmap >= 1);
1968
1969 for (i = 0; (i < nmap) && (valuelen > 0); i++) {
1970 ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) &&
1971 (map[i].br_startblock != HOLESTARTBLOCK));
1972 dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock);
1973 blkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
1974 error = xfs_read_buf(mp, mp->m_ddev_targp, dblkno,
1975 blkcnt, XBF_LOCK | XBF_DONT_BLOCK,
1976 &bp);
1977 if (error)
1978 return(error);
1979
1980 tmp = (valuelen < XFS_BUF_SIZE(bp))
1981 ? valuelen : XFS_BUF_SIZE(bp);
1982 xfs_buf_iomove(bp, 0, tmp, dst, XBRW_READ);
1983 xfs_buf_relse(bp);
1984 dst += tmp;
1985 valuelen -= tmp;
1986
1987 lblkno += map[i].br_blockcount;
1988 }
1989 }
1990 ASSERT(valuelen == 0);
1991 return(0);
1992 }
1993
1994 /*
1995 * Write the value associated with an attribute into the out-of-line buffer
1996 * that we have defined for it.
1997 */
1998 STATIC int
1999 xfs_attr_rmtval_set(xfs_da_args_t *args)
2000 {
2001 xfs_mount_t *mp;
2002 xfs_fileoff_t lfileoff;
2003 xfs_inode_t *dp;
2004 xfs_bmbt_irec_t map;
2005 xfs_daddr_t dblkno;
2006 void *src;
2007 xfs_buf_t *bp;
2008 xfs_dablk_t lblkno;
2009 int blkcnt, valuelen, nmap, error, tmp, committed;
2010
2011 dp = args->dp;
2012 mp = dp->i_mount;
2013 src = args->value;
2014
2015 /*
2016 * Find a "hole" in the attribute address space large enough for
2017 * us to drop the new attribute's value into.
2018 */
2019 blkcnt = XFS_B_TO_FSB(mp, args->valuelen);
2020 lfileoff = 0;
2021 error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff,
2022 XFS_ATTR_FORK);
2023 if (error) {
2024 return(error);
2025 }
2026 args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff;
2027 args->rmtblkcnt = blkcnt;
2028
2029 /*
2030 * Roll through the "value", allocating blocks on disk as required.
2031 */
2032 while (blkcnt > 0) {
2033 /*
2034 * Allocate a single extent, up to the size of the value.
2035 */
2036 xfs_bmap_init(args->flist, args->firstblock);
2037 nmap = 1;
2038 error = xfs_bmapi_write(args->trans, dp, (xfs_fileoff_t)lblkno,
2039 blkcnt,
2040 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2041 args->firstblock, args->total, &map, &nmap,
2042 args->flist);
2043 if (!error) {
2044 error = xfs_bmap_finish(&args->trans, args->flist,
2045 &committed);
2046 }
2047 if (error) {
2048 ASSERT(committed);
2049 args->trans = NULL;
2050 xfs_bmap_cancel(args->flist);
2051 return(error);
2052 }
2053
2054 /*
2055 * bmap_finish() may have committed the last trans and started
2056 * a new one. We need the inode to be in all transactions.
2057 */
2058 if (committed)
2059 xfs_trans_ijoin(args->trans, dp, 0);
2060
2061 ASSERT(nmap == 1);
2062 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2063 (map.br_startblock != HOLESTARTBLOCK));
2064 lblkno += map.br_blockcount;
2065 blkcnt -= map.br_blockcount;
2066
2067 /*
2068 * Start the next trans in the chain.
2069 */
2070 error = xfs_trans_roll(&args->trans, dp);
2071 if (error)
2072 return (error);
2073 }
2074
2075 /*
2076 * Roll through the "value", copying the attribute value to the
2077 * already-allocated blocks. Blocks are written synchronously
2078 * so that we can know they are all on disk before we turn off
2079 * the INCOMPLETE flag.
2080 */
2081 lblkno = args->rmtblkno;
2082 valuelen = args->valuelen;
2083 while (valuelen > 0) {
2084 /*
2085 * Try to remember where we decided to put the value.
2086 */
2087 xfs_bmap_init(args->flist, args->firstblock);
2088 nmap = 1;
2089 error = xfs_bmapi_read(dp, (xfs_fileoff_t)lblkno,
2090 args->rmtblkcnt, &map, &nmap,
2091 XFS_BMAPI_ATTRFORK);
2092 if (error)
2093 return(error);
2094 ASSERT(nmap == 1);
2095 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2096 (map.br_startblock != HOLESTARTBLOCK));
2097
2098 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
2099 blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
2100
2101 bp = xfs_buf_get(mp->m_ddev_targp, dblkno, blkcnt,
2102 XBF_LOCK | XBF_DONT_BLOCK);
2103 if (!bp)
2104 return ENOMEM;
2105 tmp = (valuelen < XFS_BUF_SIZE(bp)) ? valuelen :
2106 XFS_BUF_SIZE(bp);
2107 xfs_buf_iomove(bp, 0, tmp, src, XBRW_WRITE);
2108 if (tmp < XFS_BUF_SIZE(bp))
2109 xfs_buf_zero(bp, tmp, XFS_BUF_SIZE(bp) - tmp);
2110 error = xfs_bwrite(bp); /* GROT: NOTE: synchronous write */
2111 xfs_buf_relse(bp);
2112 if (error)
2113 return error;
2114 src += tmp;
2115 valuelen -= tmp;
2116
2117 lblkno += map.br_blockcount;
2118 }
2119 ASSERT(valuelen == 0);
2120 return(0);
2121 }
2122
2123 /*
2124 * Remove the value associated with an attribute by deleting the
2125 * out-of-line buffer that it is stored on.
2126 */
2127 STATIC int
2128 xfs_attr_rmtval_remove(xfs_da_args_t *args)
2129 {
2130 xfs_mount_t *mp;
2131 xfs_bmbt_irec_t map;
2132 xfs_buf_t *bp;
2133 xfs_daddr_t dblkno;
2134 xfs_dablk_t lblkno;
2135 int valuelen, blkcnt, nmap, error, done, committed;
2136
2137 mp = args->dp->i_mount;
2138
2139 /*
2140 * Roll through the "value", invalidating the attribute value's
2141 * blocks.
2142 */
2143 lblkno = args->rmtblkno;
2144 valuelen = args->rmtblkcnt;
2145 while (valuelen > 0) {
2146 /*
2147 * Try to remember where we decided to put the value.
2148 */
2149 nmap = 1;
2150 error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno,
2151 args->rmtblkcnt, &map, &nmap,
2152 XFS_BMAPI_ATTRFORK);
2153 if (error)
2154 return(error);
2155 ASSERT(nmap == 1);
2156 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2157 (map.br_startblock != HOLESTARTBLOCK));
2158
2159 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
2160 blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
2161
2162 /*
2163 * If the "remote" value is in the cache, remove it.
2164 */
2165 bp = xfs_incore(mp->m_ddev_targp, dblkno, blkcnt, XBF_TRYLOCK);
2166 if (bp) {
2167 xfs_buf_stale(bp);
2168 xfs_buf_relse(bp);
2169 bp = NULL;
2170 }
2171
2172 valuelen -= map.br_blockcount;
2173
2174 lblkno += map.br_blockcount;
2175 }
2176
2177 /*
2178 * Keep de-allocating extents until the remote-value region is gone.
2179 */
2180 lblkno = args->rmtblkno;
2181 blkcnt = args->rmtblkcnt;
2182 done = 0;
2183 while (!done) {
2184 xfs_bmap_init(args->flist, args->firstblock);
2185 error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt,
2186 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2187 1, args->firstblock, args->flist,
2188 &done);
2189 if (!error) {
2190 error = xfs_bmap_finish(&args->trans, args->flist,
2191 &committed);
2192 }
2193 if (error) {
2194 ASSERT(committed);
2195 args->trans = NULL;
2196 xfs_bmap_cancel(args->flist);
2197 return(error);
2198 }
2199
2200 /*
2201 * bmap_finish() may have committed the last trans and started
2202 * a new one. We need the inode to be in all transactions.
2203 */
2204 if (committed)
2205 xfs_trans_ijoin(args->trans, args->dp, 0);
2206
2207 /*
2208 * Close out trans and start the next one in the chain.
2209 */
2210 error = xfs_trans_roll(&args->trans, args->dp);
2211 if (error)
2212 return (error);
2213 }
2214 return(0);
2215 }