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Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target...
[linux-btrfs-devel.git] / fs / xfs / xfs_attr.c
blob160bcdc34a6e91d6ce77394089123b2a86abc3dc
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);
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);
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);
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);
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 /*
827 * Signal synchronous inactive transactions unless this is a
828 * synchronous mount filesystem in which case we know that we're here
829 * because we've been called out of xfs_inactive which means that the
830 * last reference is gone and the unlink transaction has already hit
831 * the disk so async inactive transactions are safe.
832 */
833 if (!(mp->m_flags & XFS_MOUNT_WSYNC)) {
834 if (dp->i_d.di_anextents > 0)
835 xfs_trans_set_sync(trans);
836 }
837
838 error = xfs_itruncate_extents(&trans, dp, XFS_ATTR_FORK, 0);
839 if (error)
840 goto out;
841
842 /*
843 * Commit the last in the sequence of transactions.
844 */
845 xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
846 error = xfs_trans_commit(trans, XFS_TRANS_RELEASE_LOG_RES);
847 xfs_iunlock(dp, XFS_ILOCK_EXCL);
848
849 return(error);
850
851 out:
852 xfs_trans_cancel(trans, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
853 xfs_iunlock(dp, XFS_ILOCK_EXCL);
854 return(error);
855 }
856
857
858
859 /*========================================================================
860 * External routines when attribute list is inside the inode
861 *========================================================================*/
862
863 /*
864 * Add a name to the shortform attribute list structure
865 * This is the external routine.
866 */
867 STATIC int
868 xfs_attr_shortform_addname(xfs_da_args_t *args)
869 {
870 int newsize, forkoff, retval;
871
872 retval = xfs_attr_shortform_lookup(args);
873 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
874 return(retval);
875 } else if (retval == EEXIST) {
876 if (args->flags & ATTR_CREATE)
877 return(retval);
878 retval = xfs_attr_shortform_remove(args);
879 ASSERT(retval == 0);
880 }
881
882 if (args->namelen >= XFS_ATTR_SF_ENTSIZE_MAX ||
883 args->valuelen >= XFS_ATTR_SF_ENTSIZE_MAX)
884 return(XFS_ERROR(ENOSPC));
885
886 newsize = XFS_ATTR_SF_TOTSIZE(args->dp);
887 newsize += XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
888
889 forkoff = xfs_attr_shortform_bytesfit(args->dp, newsize);
890 if (!forkoff)
891 return(XFS_ERROR(ENOSPC));
892
893 xfs_attr_shortform_add(args, forkoff);
894 return(0);
895 }
896
897
898 /*========================================================================
899 * External routines when attribute list is one block
900 *========================================================================*/
901
902 /*
903 * Add a name to the leaf attribute list structure
904 *
905 * This leaf block cannot have a "remote" value, we only call this routine
906 * if bmap_one_block() says there is only one block (ie: no remote blks).
907 */
908 STATIC int
909 xfs_attr_leaf_addname(xfs_da_args_t *args)
910 {
911 xfs_inode_t *dp;
912 xfs_dabuf_t *bp;
913 int retval, error, committed, forkoff;
914
915 /*
916 * Read the (only) block in the attribute list in.
917 */
918 dp = args->dp;
919 args->blkno = 0;
920 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
921 XFS_ATTR_FORK);
922 if (error)
923 return(error);
924 ASSERT(bp != NULL);
925
926 /*
927 * Look up the given attribute in the leaf block. Figure out if
928 * the given flags produce an error or call for an atomic rename.
929 */
930 retval = xfs_attr_leaf_lookup_int(bp, args);
931 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
932 xfs_da_brelse(args->trans, bp);
933 return(retval);
934 } else if (retval == EEXIST) {
935 if (args->flags & ATTR_CREATE) { /* pure create op */
936 xfs_da_brelse(args->trans, bp);
937 return(retval);
938 }
939 args->op_flags |= XFS_DA_OP_RENAME; /* an atomic rename */
940 args->blkno2 = args->blkno; /* set 2nd entry info*/
941 args->index2 = args->index;
942 args->rmtblkno2 = args->rmtblkno;
943 args->rmtblkcnt2 = args->rmtblkcnt;
944 }
945
946 /*
947 * Add the attribute to the leaf block, transitioning to a Btree
948 * if required.
949 */
950 retval = xfs_attr_leaf_add(bp, args);
951 xfs_da_buf_done(bp);
952 if (retval == ENOSPC) {
953 /*
954 * Promote the attribute list to the Btree format, then
955 * Commit that transaction so that the node_addname() call
956 * can manage its own transactions.
957 */
958 xfs_bmap_init(args->flist, args->firstblock);
959 error = xfs_attr_leaf_to_node(args);
960 if (!error) {
961 error = xfs_bmap_finish(&args->trans, args->flist,
962 &committed);
963 }
964 if (error) {
965 ASSERT(committed);
966 args->trans = NULL;
967 xfs_bmap_cancel(args->flist);
968 return(error);
969 }
970
971 /*
972 * bmap_finish() may have committed the last trans and started
973 * a new one. We need the inode to be in all transactions.
974 */
975 if (committed)
976 xfs_trans_ijoin(args->trans, dp);
977
978 /*
979 * Commit the current trans (including the inode) and start
980 * a new one.
981 */
982 error = xfs_trans_roll(&args->trans, dp);
983 if (error)
984 return (error);
985
986 /*
987 * Fob the whole rest of the problem off on the Btree code.
988 */
989 error = xfs_attr_node_addname(args);
990 return(error);
991 }
992
993 /*
994 * Commit the transaction that added the attr name so that
995 * later routines can manage their own transactions.
996 */
997 error = xfs_trans_roll(&args->trans, dp);
998 if (error)
999 return (error);
1000
1001 /*
1002 * If there was an out-of-line value, allocate the blocks we
1003 * identified for its storage and copy the value. This is done
1004 * after we create the attribute so that we don't overflow the
1005 * maximum size of a transaction and/or hit a deadlock.
1006 */
1007 if (args->rmtblkno > 0) {
1008 error = xfs_attr_rmtval_set(args);
1009 if (error)
1010 return(error);
1011 }
1012
1013 /*
1014 * If this is an atomic rename operation, we must "flip" the
1015 * incomplete flags on the "new" and "old" attribute/value pairs
1016 * so that one disappears and one appears atomically. Then we
1017 * must remove the "old" attribute/value pair.
1018 */
1019 if (args->op_flags & XFS_DA_OP_RENAME) {
1020 /*
1021 * In a separate transaction, set the incomplete flag on the
1022 * "old" attr and clear the incomplete flag on the "new" attr.
1023 */
1024 error = xfs_attr_leaf_flipflags(args);
1025 if (error)
1026 return(error);
1027
1028 /*
1029 * Dismantle the "old" attribute/value pair by removing
1030 * a "remote" value (if it exists).
1031 */
1032 args->index = args->index2;
1033 args->blkno = args->blkno2;
1034 args->rmtblkno = args->rmtblkno2;
1035 args->rmtblkcnt = args->rmtblkcnt2;
1036 if (args->rmtblkno) {
1037 error = xfs_attr_rmtval_remove(args);
1038 if (error)
1039 return(error);
1040 }
1041
1042 /*
1043 * Read in the block containing the "old" attr, then
1044 * remove the "old" attr from that block (neat, huh!)
1045 */
1046 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1,
1047 &bp, XFS_ATTR_FORK);
1048 if (error)
1049 return(error);
1050 ASSERT(bp != NULL);
1051 (void)xfs_attr_leaf_remove(bp, args);
1052
1053 /*
1054 * If the result is small enough, shrink it all into the inode.
1055 */
1056 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1057 xfs_bmap_init(args->flist, args->firstblock);
1058 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1059 /* bp is gone due to xfs_da_shrink_inode */
1060 if (!error) {
1061 error = xfs_bmap_finish(&args->trans,
1062 args->flist,
1063 &committed);
1064 }
1065 if (error) {
1066 ASSERT(committed);
1067 args->trans = NULL;
1068 xfs_bmap_cancel(args->flist);
1069 return(error);
1070 }
1071
1072 /*
1073 * bmap_finish() may have committed the last trans
1074 * and started a new one. We need the inode to be
1075 * in all transactions.
1076 */
1077 if (committed)
1078 xfs_trans_ijoin(args->trans, dp);
1079 } else
1080 xfs_da_buf_done(bp);
1081
1082 /*
1083 * Commit the remove and start the next trans in series.
1084 */
1085 error = xfs_trans_roll(&args->trans, dp);
1086
1087 } else if (args->rmtblkno > 0) {
1088 /*
1089 * Added a "remote" value, just clear the incomplete flag.
1090 */
1091 error = xfs_attr_leaf_clearflag(args);
1092 }
1093 return(error);
1094 }
1095
1096 /*
1097 * Remove a name from the leaf attribute list structure
1098 *
1099 * This leaf block cannot have a "remote" value, we only call this routine
1100 * if bmap_one_block() says there is only one block (ie: no remote blks).
1101 */
1102 STATIC int
1103 xfs_attr_leaf_removename(xfs_da_args_t *args)
1104 {
1105 xfs_inode_t *dp;
1106 xfs_dabuf_t *bp;
1107 int error, committed, forkoff;
1108
1109 /*
1110 * Remove the attribute.
1111 */
1112 dp = args->dp;
1113 args->blkno = 0;
1114 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
1115 XFS_ATTR_FORK);
1116 if (error) {
1117 return(error);
1118 }
1119
1120 ASSERT(bp != NULL);
1121 error = xfs_attr_leaf_lookup_int(bp, args);
1122 if (error == ENOATTR) {
1123 xfs_da_brelse(args->trans, bp);
1124 return(error);
1125 }
1126
1127 (void)xfs_attr_leaf_remove(bp, args);
1128
1129 /*
1130 * If the result is small enough, shrink it all into the inode.
1131 */
1132 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1133 xfs_bmap_init(args->flist, args->firstblock);
1134 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1135 /* bp is gone due to xfs_da_shrink_inode */
1136 if (!error) {
1137 error = xfs_bmap_finish(&args->trans, args->flist,
1138 &committed);
1139 }
1140 if (error) {
1141 ASSERT(committed);
1142 args->trans = NULL;
1143 xfs_bmap_cancel(args->flist);
1144 return(error);
1145 }
1146
1147 /*
1148 * bmap_finish() may have committed the last trans and started
1149 * a new one. We need the inode to be in all transactions.
1150 */
1151 if (committed)
1152 xfs_trans_ijoin(args->trans, dp);
1153 } else
1154 xfs_da_buf_done(bp);
1155 return(0);
1156 }
1157
1158 /*
1159 * Look up a name in a leaf attribute list structure.
1160 *
1161 * This leaf block cannot have a "remote" value, we only call this routine
1162 * if bmap_one_block() says there is only one block (ie: no remote blks).
1163 */
1164 STATIC int
1165 xfs_attr_leaf_get(xfs_da_args_t *args)
1166 {
1167 xfs_dabuf_t *bp;
1168 int error;
1169
1170 args->blkno = 0;
1171 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
1172 XFS_ATTR_FORK);
1173 if (error)
1174 return(error);
1175 ASSERT(bp != NULL);
1176
1177 error = xfs_attr_leaf_lookup_int(bp, args);
1178 if (error != EEXIST) {
1179 xfs_da_brelse(args->trans, bp);
1180 return(error);
1181 }
1182 error = xfs_attr_leaf_getvalue(bp, args);
1183 xfs_da_brelse(args->trans, bp);
1184 if (!error && (args->rmtblkno > 0) && !(args->flags & ATTR_KERNOVAL)) {
1185 error = xfs_attr_rmtval_get(args);
1186 }
1187 return(error);
1188 }
1189
1190 /*
1191 * Copy out attribute entries for attr_list(), for leaf attribute lists.
1192 */
1193 STATIC int
1194 xfs_attr_leaf_list(xfs_attr_list_context_t *context)
1195 {
1196 xfs_attr_leafblock_t *leaf;
1197 int error;
1198 xfs_dabuf_t *bp;
1199
1200 context->cursor->blkno = 0;
1201 error = xfs_da_read_buf(NULL, context->dp, 0, -1, &bp, XFS_ATTR_FORK);
1202 if (error)
1203 return XFS_ERROR(error);
1204 ASSERT(bp != NULL);
1205 leaf = bp->data;
1206 if (unlikely(leaf->hdr.info.magic != cpu_to_be16(XFS_ATTR_LEAF_MAGIC))) {
1207 XFS_CORRUPTION_ERROR("xfs_attr_leaf_list", XFS_ERRLEVEL_LOW,
1208 context->dp->i_mount, leaf);
1209 xfs_da_brelse(NULL, bp);
1210 return XFS_ERROR(EFSCORRUPTED);
1211 }
1212
1213 error = xfs_attr_leaf_list_int(bp, context);
1214 xfs_da_brelse(NULL, bp);
1215 return XFS_ERROR(error);
1216 }
1217
1218
1219 /*========================================================================
1220 * External routines when attribute list size > XFS_LBSIZE(mp).
1221 *========================================================================*/
1222
1223 /*
1224 * Add a name to a Btree-format attribute list.
1225 *
1226 * This will involve walking down the Btree, and may involve splitting
1227 * leaf nodes and even splitting intermediate nodes up to and including
1228 * the root node (a special case of an intermediate node).
1229 *
1230 * "Remote" attribute values confuse the issue and atomic rename operations
1231 * add a whole extra layer of confusion on top of that.
1232 */
1233 STATIC int
1234 xfs_attr_node_addname(xfs_da_args_t *args)
1235 {
1236 xfs_da_state_t *state;
1237 xfs_da_state_blk_t *blk;
1238 xfs_inode_t *dp;
1239 xfs_mount_t *mp;
1240 int committed, retval, error;
1241
1242 /*
1243 * Fill in bucket of arguments/results/context to carry around.
1244 */
1245 dp = args->dp;
1246 mp = dp->i_mount;
1247 restart:
1248 state = xfs_da_state_alloc();
1249 state->args = args;
1250 state->mp = mp;
1251 state->blocksize = state->mp->m_sb.sb_blocksize;
1252 state->node_ents = state->mp->m_attr_node_ents;
1253
1254 /*
1255 * Search to see if name already exists, and get back a pointer
1256 * to where it should go.
1257 */
1258 error = xfs_da_node_lookup_int(state, &retval);
1259 if (error)
1260 goto out;
1261 blk = &state->path.blk[ state->path.active-1 ];
1262 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1263 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
1264 goto out;
1265 } else if (retval == EEXIST) {
1266 if (args->flags & ATTR_CREATE)
1267 goto out;
1268 args->op_flags |= XFS_DA_OP_RENAME; /* atomic rename op */
1269 args->blkno2 = args->blkno; /* set 2nd entry info*/
1270 args->index2 = args->index;
1271 args->rmtblkno2 = args->rmtblkno;
1272 args->rmtblkcnt2 = args->rmtblkcnt;
1273 args->rmtblkno = 0;
1274 args->rmtblkcnt = 0;
1275 }
1276
1277 retval = xfs_attr_leaf_add(blk->bp, state->args);
1278 if (retval == ENOSPC) {
1279 if (state->path.active == 1) {
1280 /*
1281 * Its really a single leaf node, but it had
1282 * out-of-line values so it looked like it *might*
1283 * have been a b-tree.
1284 */
1285 xfs_da_state_free(state);
1286 xfs_bmap_init(args->flist, args->firstblock);
1287 error = xfs_attr_leaf_to_node(args);
1288 if (!error) {
1289 error = xfs_bmap_finish(&args->trans,
1290 args->flist,
1291 &committed);
1292 }
1293 if (error) {
1294 ASSERT(committed);
1295 args->trans = NULL;
1296 xfs_bmap_cancel(args->flist);
1297 goto out;
1298 }
1299
1300 /*
1301 * bmap_finish() may have committed the last trans
1302 * and started a new one. We need the inode to be
1303 * in all transactions.
1304 */
1305 if (committed)
1306 xfs_trans_ijoin(args->trans, dp);
1307
1308 /*
1309 * Commit the node conversion and start the next
1310 * trans in the chain.
1311 */
1312 error = xfs_trans_roll(&args->trans, dp);
1313 if (error)
1314 goto out;
1315
1316 goto restart;
1317 }
1318
1319 /*
1320 * Split as many Btree elements as required.
1321 * This code tracks the new and old attr's location
1322 * in the index/blkno/rmtblkno/rmtblkcnt fields and
1323 * in the index2/blkno2/rmtblkno2/rmtblkcnt2 fields.
1324 */
1325 xfs_bmap_init(args->flist, args->firstblock);
1326 error = xfs_da_split(state);
1327 if (!error) {
1328 error = xfs_bmap_finish(&args->trans, args->flist,
1329 &committed);
1330 }
1331 if (error) {
1332 ASSERT(committed);
1333 args->trans = NULL;
1334 xfs_bmap_cancel(args->flist);
1335 goto out;
1336 }
1337
1338 /*
1339 * bmap_finish() may have committed the last trans and started
1340 * a new one. We need the inode to be in all transactions.
1341 */
1342 if (committed)
1343 xfs_trans_ijoin(args->trans, dp);
1344 } else {
1345 /*
1346 * Addition succeeded, update Btree hashvals.
1347 */
1348 xfs_da_fixhashpath(state, &state->path);
1349 }
1350
1351 /*
1352 * Kill the state structure, we're done with it and need to
1353 * allow the buffers to come back later.
1354 */
1355 xfs_da_state_free(state);
1356 state = NULL;
1357
1358 /*
1359 * Commit the leaf addition or btree split and start the next
1360 * trans in the chain.
1361 */
1362 error = xfs_trans_roll(&args->trans, dp);
1363 if (error)
1364 goto out;
1365
1366 /*
1367 * If there was an out-of-line value, allocate the blocks we
1368 * identified for its storage and copy the value. This is done
1369 * after we create the attribute so that we don't overflow the
1370 * maximum size of a transaction and/or hit a deadlock.
1371 */
1372 if (args->rmtblkno > 0) {
1373 error = xfs_attr_rmtval_set(args);
1374 if (error)
1375 return(error);
1376 }
1377
1378 /*
1379 * If this is an atomic rename operation, we must "flip" the
1380 * incomplete flags on the "new" and "old" attribute/value pairs
1381 * so that one disappears and one appears atomically. Then we
1382 * must remove the "old" attribute/value pair.
1383 */
1384 if (args->op_flags & XFS_DA_OP_RENAME) {
1385 /*
1386 * In a separate transaction, set the incomplete flag on the
1387 * "old" attr and clear the incomplete flag on the "new" attr.
1388 */
1389 error = xfs_attr_leaf_flipflags(args);
1390 if (error)
1391 goto out;
1392
1393 /*
1394 * Dismantle the "old" attribute/value pair by removing
1395 * a "remote" value (if it exists).
1396 */
1397 args->index = args->index2;
1398 args->blkno = args->blkno2;
1399 args->rmtblkno = args->rmtblkno2;
1400 args->rmtblkcnt = args->rmtblkcnt2;
1401 if (args->rmtblkno) {
1402 error = xfs_attr_rmtval_remove(args);
1403 if (error)
1404 return(error);
1405 }
1406
1407 /*
1408 * Re-find the "old" attribute entry after any split ops.
1409 * The INCOMPLETE flag means that we will find the "old"
1410 * attr, not the "new" one.
1411 */
1412 args->flags |= XFS_ATTR_INCOMPLETE;
1413 state = xfs_da_state_alloc();
1414 state->args = args;
1415 state->mp = mp;
1416 state->blocksize = state->mp->m_sb.sb_blocksize;
1417 state->node_ents = state->mp->m_attr_node_ents;
1418 state->inleaf = 0;
1419 error = xfs_da_node_lookup_int(state, &retval);
1420 if (error)
1421 goto out;
1422
1423 /*
1424 * Remove the name and update the hashvals in the tree.
1425 */
1426 blk = &state->path.blk[ state->path.active-1 ];
1427 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1428 error = xfs_attr_leaf_remove(blk->bp, args);
1429 xfs_da_fixhashpath(state, &state->path);
1430
1431 /*
1432 * Check to see if the tree needs to be collapsed.
1433 */
1434 if (retval && (state->path.active > 1)) {
1435 xfs_bmap_init(args->flist, args->firstblock);
1436 error = xfs_da_join(state);
1437 if (!error) {
1438 error = xfs_bmap_finish(&args->trans,
1439 args->flist,
1440 &committed);
1441 }
1442 if (error) {
1443 ASSERT(committed);
1444 args->trans = NULL;
1445 xfs_bmap_cancel(args->flist);
1446 goto out;
1447 }
1448
1449 /*
1450 * bmap_finish() may have committed the last trans
1451 * and started a new one. We need the inode to be
1452 * in all transactions.
1453 */
1454 if (committed)
1455 xfs_trans_ijoin(args->trans, dp);
1456 }
1457
1458 /*
1459 * Commit and start the next trans in the chain.
1460 */
1461 error = xfs_trans_roll(&args->trans, dp);
1462 if (error)
1463 goto out;
1464
1465 } else if (args->rmtblkno > 0) {
1466 /*
1467 * Added a "remote" value, just clear the incomplete flag.
1468 */
1469 error = xfs_attr_leaf_clearflag(args);
1470 if (error)
1471 goto out;
1472 }
1473 retval = error = 0;
1474
1475 out:
1476 if (state)
1477 xfs_da_state_free(state);
1478 if (error)
1479 return(error);
1480 return(retval);
1481 }
1482
1483 /*
1484 * Remove a name from a B-tree attribute list.
1485 *
1486 * This will involve walking down the Btree, and may involve joining
1487 * leaf nodes and even joining intermediate nodes up to and including
1488 * the root node (a special case of an intermediate node).
1489 */
1490 STATIC int
1491 xfs_attr_node_removename(xfs_da_args_t *args)
1492 {
1493 xfs_da_state_t *state;
1494 xfs_da_state_blk_t *blk;
1495 xfs_inode_t *dp;
1496 xfs_dabuf_t *bp;
1497 int retval, error, committed, forkoff;
1498
1499 /*
1500 * Tie a string around our finger to remind us where we are.
1501 */
1502 dp = args->dp;
1503 state = xfs_da_state_alloc();
1504 state->args = args;
1505 state->mp = dp->i_mount;
1506 state->blocksize = state->mp->m_sb.sb_blocksize;
1507 state->node_ents = state->mp->m_attr_node_ents;
1508
1509 /*
1510 * Search to see if name exists, and get back a pointer to it.
1511 */
1512 error = xfs_da_node_lookup_int(state, &retval);
1513 if (error || (retval != EEXIST)) {
1514 if (error == 0)
1515 error = retval;
1516 goto out;
1517 }
1518
1519 /*
1520 * If there is an out-of-line value, de-allocate the blocks.
1521 * This is done before we remove the attribute so that we don't
1522 * overflow the maximum size of a transaction and/or hit a deadlock.
1523 */
1524 blk = &state->path.blk[ state->path.active-1 ];
1525 ASSERT(blk->bp != NULL);
1526 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1527 if (args->rmtblkno > 0) {
1528 /*
1529 * Fill in disk block numbers in the state structure
1530 * so that we can get the buffers back after we commit
1531 * several transactions in the following calls.
1532 */
1533 error = xfs_attr_fillstate(state);
1534 if (error)
1535 goto out;
1536
1537 /*
1538 * Mark the attribute as INCOMPLETE, then bunmapi() the
1539 * remote value.
1540 */
1541 error = xfs_attr_leaf_setflag(args);
1542 if (error)
1543 goto out;
1544 error = xfs_attr_rmtval_remove(args);
1545 if (error)
1546 goto out;
1547
1548 /*
1549 * Refill the state structure with buffers, the prior calls
1550 * released our buffers.
1551 */
1552 error = xfs_attr_refillstate(state);
1553 if (error)
1554 goto out;
1555 }
1556
1557 /*
1558 * Remove the name and update the hashvals in the tree.
1559 */
1560 blk = &state->path.blk[ state->path.active-1 ];
1561 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1562 retval = xfs_attr_leaf_remove(blk->bp, args);
1563 xfs_da_fixhashpath(state, &state->path);
1564
1565 /*
1566 * Check to see if the tree needs to be collapsed.
1567 */
1568 if (retval && (state->path.active > 1)) {
1569 xfs_bmap_init(args->flist, args->firstblock);
1570 error = xfs_da_join(state);
1571 if (!error) {
1572 error = xfs_bmap_finish(&args->trans, args->flist,
1573 &committed);
1574 }
1575 if (error) {
1576 ASSERT(committed);
1577 args->trans = NULL;
1578 xfs_bmap_cancel(args->flist);
1579 goto out;
1580 }
1581
1582 /*
1583 * bmap_finish() may have committed the last trans and started
1584 * a new one. We need the inode to be in all transactions.
1585 */
1586 if (committed)
1587 xfs_trans_ijoin(args->trans, dp);
1588
1589 /*
1590 * Commit the Btree join operation and start a new trans.
1591 */
1592 error = xfs_trans_roll(&args->trans, dp);
1593 if (error)
1594 goto out;
1595 }
1596
1597 /*
1598 * If the result is small enough, push it all into the inode.
1599 */
1600 if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
1601 /*
1602 * Have to get rid of the copy of this dabuf in the state.
1603 */
1604 ASSERT(state->path.active == 1);
1605 ASSERT(state->path.blk[0].bp);
1606 xfs_da_buf_done(state->path.blk[0].bp);
1607 state->path.blk[0].bp = NULL;
1608
1609 error = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp,
1610 XFS_ATTR_FORK);
1611 if (error)
1612 goto out;
1613 ASSERT((((xfs_attr_leafblock_t *)bp->data)->hdr.info.magic) ==
1614 cpu_to_be16(XFS_ATTR_LEAF_MAGIC));
1615
1616 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1617 xfs_bmap_init(args->flist, args->firstblock);
1618 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1619 /* bp is gone due to xfs_da_shrink_inode */
1620 if (!error) {
1621 error = xfs_bmap_finish(&args->trans,
1622 args->flist,
1623 &committed);
1624 }
1625 if (error) {
1626 ASSERT(committed);
1627 args->trans = NULL;
1628 xfs_bmap_cancel(args->flist);
1629 goto out;
1630 }
1631
1632 /*
1633 * bmap_finish() may have committed the last trans
1634 * and started a new one. We need the inode to be
1635 * in all transactions.
1636 */
1637 if (committed)
1638 xfs_trans_ijoin(args->trans, dp);
1639 } else
1640 xfs_da_brelse(args->trans, bp);
1641 }
1642 error = 0;
1643
1644 out:
1645 xfs_da_state_free(state);
1646 return(error);
1647 }
1648
1649 /*
1650 * Fill in the disk block numbers in the state structure for the buffers
1651 * that are attached to the state structure.
1652 * This is done so that we can quickly reattach ourselves to those buffers
1653 * after some set of transaction commits have released these buffers.
1654 */
1655 STATIC int
1656 xfs_attr_fillstate(xfs_da_state_t *state)
1657 {
1658 xfs_da_state_path_t *path;
1659 xfs_da_state_blk_t *blk;
1660 int level;
1661
1662 /*
1663 * Roll down the "path" in the state structure, storing the on-disk
1664 * block number for those buffers in the "path".
1665 */
1666 path = &state->path;
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 /*
1679 * Roll down the "altpath" in the state structure, storing the on-disk
1680 * block number for those buffers in the "altpath".
1681 */
1682 path = &state->altpath;
1683 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1684 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1685 if (blk->bp) {
1686 blk->disk_blkno = xfs_da_blkno(blk->bp);
1687 xfs_da_buf_done(blk->bp);
1688 blk->bp = NULL;
1689 } else {
1690 blk->disk_blkno = 0;
1691 }
1692 }
1693
1694 return(0);
1695 }
1696
1697 /*
1698 * Reattach the buffers to the state structure based on the disk block
1699 * numbers stored in the state structure.
1700 * This is done after some set of transaction commits have released those
1701 * buffers from our grip.
1702 */
1703 STATIC int
1704 xfs_attr_refillstate(xfs_da_state_t *state)
1705 {
1706 xfs_da_state_path_t *path;
1707 xfs_da_state_blk_t *blk;
1708 int level, error;
1709
1710 /*
1711 * Roll down the "path" in the state structure, storing the on-disk
1712 * block number for those buffers in the "path".
1713 */
1714 path = &state->path;
1715 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1716 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1717 if (blk->disk_blkno) {
1718 error = xfs_da_read_buf(state->args->trans,
1719 state->args->dp,
1720 blk->blkno, blk->disk_blkno,
1721 &blk->bp, XFS_ATTR_FORK);
1722 if (error)
1723 return(error);
1724 } else {
1725 blk->bp = NULL;
1726 }
1727 }
1728
1729 /*
1730 * Roll down the "altpath" in the state structure, storing the on-disk
1731 * block number for those buffers in the "altpath".
1732 */
1733 path = &state->altpath;
1734 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1735 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1736 if (blk->disk_blkno) {
1737 error = xfs_da_read_buf(state->args->trans,
1738 state->args->dp,
1739 blk->blkno, blk->disk_blkno,
1740 &blk->bp, XFS_ATTR_FORK);
1741 if (error)
1742 return(error);
1743 } else {
1744 blk->bp = NULL;
1745 }
1746 }
1747
1748 return(0);
1749 }
1750
1751 /*
1752 * Look up a filename in a node attribute list.
1753 *
1754 * This routine gets called for any attribute fork that has more than one
1755 * block, ie: both true Btree attr lists and for single-leaf-blocks with
1756 * "remote" values taking up more blocks.
1757 */
1758 STATIC int
1759 xfs_attr_node_get(xfs_da_args_t *args)
1760 {
1761 xfs_da_state_t *state;
1762 xfs_da_state_blk_t *blk;
1763 int error, retval;
1764 int i;
1765
1766 state = xfs_da_state_alloc();
1767 state->args = args;
1768 state->mp = args->dp->i_mount;
1769 state->blocksize = state->mp->m_sb.sb_blocksize;
1770 state->node_ents = state->mp->m_attr_node_ents;
1771
1772 /*
1773 * Search to see if name exists, and get back a pointer to it.
1774 */
1775 error = xfs_da_node_lookup_int(state, &retval);
1776 if (error) {
1777 retval = error;
1778 } else if (retval == EEXIST) {
1779 blk = &state->path.blk[ state->path.active-1 ];
1780 ASSERT(blk->bp != NULL);
1781 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1782
1783 /*
1784 * Get the value, local or "remote"
1785 */
1786 retval = xfs_attr_leaf_getvalue(blk->bp, args);
1787 if (!retval && (args->rmtblkno > 0)
1788 && !(args->flags & ATTR_KERNOVAL)) {
1789 retval = xfs_attr_rmtval_get(args);
1790 }
1791 }
1792
1793 /*
1794 * If not in a transaction, we have to release all the buffers.
1795 */
1796 for (i = 0; i < state->path.active; i++) {
1797 xfs_da_brelse(args->trans, state->path.blk[i].bp);
1798 state->path.blk[i].bp = NULL;
1799 }
1800
1801 xfs_da_state_free(state);
1802 return(retval);
1803 }
1804
1805 STATIC int /* error */
1806 xfs_attr_node_list(xfs_attr_list_context_t *context)
1807 {
1808 attrlist_cursor_kern_t *cursor;
1809 xfs_attr_leafblock_t *leaf;
1810 xfs_da_intnode_t *node;
1811 xfs_da_node_entry_t *btree;
1812 int error, i;
1813 xfs_dabuf_t *bp;
1814
1815 cursor = context->cursor;
1816 cursor->initted = 1;
1817
1818 /*
1819 * Do all sorts of validation on the passed-in cursor structure.
1820 * If anything is amiss, ignore the cursor and look up the hashval
1821 * starting from the btree root.
1822 */
1823 bp = NULL;
1824 if (cursor->blkno > 0) {
1825 error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
1826 &bp, XFS_ATTR_FORK);
1827 if ((error != 0) && (error != EFSCORRUPTED))
1828 return(error);
1829 if (bp) {
1830 node = bp->data;
1831 switch (be16_to_cpu(node->hdr.info.magic)) {
1832 case XFS_DA_NODE_MAGIC:
1833 trace_xfs_attr_list_wrong_blk(context);
1834 xfs_da_brelse(NULL, bp);
1835 bp = NULL;
1836 break;
1837 case XFS_ATTR_LEAF_MAGIC:
1838 leaf = bp->data;
1839 if (cursor->hashval > be32_to_cpu(leaf->entries[
1840 be16_to_cpu(leaf->hdr.count)-1].hashval)) {
1841 trace_xfs_attr_list_wrong_blk(context);
1842 xfs_da_brelse(NULL, bp);
1843 bp = NULL;
1844 } else if (cursor->hashval <=
1845 be32_to_cpu(leaf->entries[0].hashval)) {
1846 trace_xfs_attr_list_wrong_blk(context);
1847 xfs_da_brelse(NULL, bp);
1848 bp = NULL;
1849 }
1850 break;
1851 default:
1852 trace_xfs_attr_list_wrong_blk(context);
1853 xfs_da_brelse(NULL, bp);
1854 bp = NULL;
1855 }
1856 }
1857 }
1858
1859 /*
1860 * We did not find what we expected given the cursor's contents,
1861 * so we start from the top and work down based on the hash value.
1862 * Note that start of node block is same as start of leaf block.
1863 */
1864 if (bp == NULL) {
1865 cursor->blkno = 0;
1866 for (;;) {
1867 error = xfs_da_read_buf(NULL, context->dp,
1868 cursor->blkno, -1, &bp,
1869 XFS_ATTR_FORK);
1870 if (error)
1871 return(error);
1872 if (unlikely(bp == NULL)) {
1873 XFS_ERROR_REPORT("xfs_attr_node_list(2)",
1874 XFS_ERRLEVEL_LOW,
1875 context->dp->i_mount);
1876 return(XFS_ERROR(EFSCORRUPTED));
1877 }
1878 node = bp->data;
1879 if (node->hdr.info.magic ==
1880 cpu_to_be16(XFS_ATTR_LEAF_MAGIC))
1881 break;
1882 if (unlikely(node->hdr.info.magic !=
1883 cpu_to_be16(XFS_DA_NODE_MAGIC))) {
1884 XFS_CORRUPTION_ERROR("xfs_attr_node_list(3)",
1885 XFS_ERRLEVEL_LOW,
1886 context->dp->i_mount,
1887 node);
1888 xfs_da_brelse(NULL, bp);
1889 return(XFS_ERROR(EFSCORRUPTED));
1890 }
1891 btree = node->btree;
1892 for (i = 0; i < be16_to_cpu(node->hdr.count);
1893 btree++, i++) {
1894 if (cursor->hashval
1895 <= be32_to_cpu(btree->hashval)) {
1896 cursor->blkno = be32_to_cpu(btree->before);
1897 trace_xfs_attr_list_node_descend(context,
1898 btree);
1899 break;
1900 }
1901 }
1902 if (i == be16_to_cpu(node->hdr.count)) {
1903 xfs_da_brelse(NULL, bp);
1904 return(0);
1905 }
1906 xfs_da_brelse(NULL, bp);
1907 }
1908 }
1909 ASSERT(bp != NULL);
1910
1911 /*
1912 * Roll upward through the blocks, processing each leaf block in
1913 * order. As long as there is space in the result buffer, keep
1914 * adding the information.
1915 */
1916 for (;;) {
1917 leaf = bp->data;
1918 if (unlikely(leaf->hdr.info.magic !=
1919 cpu_to_be16(XFS_ATTR_LEAF_MAGIC))) {
1920 XFS_CORRUPTION_ERROR("xfs_attr_node_list(4)",
1921 XFS_ERRLEVEL_LOW,
1922 context->dp->i_mount, leaf);
1923 xfs_da_brelse(NULL, bp);
1924 return(XFS_ERROR(EFSCORRUPTED));
1925 }
1926 error = xfs_attr_leaf_list_int(bp, context);
1927 if (error) {
1928 xfs_da_brelse(NULL, bp);
1929 return error;
1930 }
1931 if (context->seen_enough || leaf->hdr.info.forw == 0)
1932 break;
1933 cursor->blkno = be32_to_cpu(leaf->hdr.info.forw);
1934 xfs_da_brelse(NULL, bp);
1935 error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
1936 &bp, XFS_ATTR_FORK);
1937 if (error)
1938 return(error);
1939 if (unlikely((bp == NULL))) {
1940 XFS_ERROR_REPORT("xfs_attr_node_list(5)",
1941 XFS_ERRLEVEL_LOW,
1942 context->dp->i_mount);
1943 return(XFS_ERROR(EFSCORRUPTED));
1944 }
1945 }
1946 xfs_da_brelse(NULL, bp);
1947 return(0);
1948 }
1949
1950
1951 /*========================================================================
1952 * External routines for manipulating out-of-line attribute values.
1953 *========================================================================*/
1954
1955 /*
1956 * Read the value associated with an attribute from the out-of-line buffer
1957 * that we stored it in.
1958 */
1959 int
1960 xfs_attr_rmtval_get(xfs_da_args_t *args)
1961 {
1962 xfs_bmbt_irec_t map[ATTR_RMTVALUE_MAPSIZE];
1963 xfs_mount_t *mp;
1964 xfs_daddr_t dblkno;
1965 void *dst;
1966 xfs_buf_t *bp;
1967 int nmap, error, tmp, valuelen, blkcnt, i;
1968 xfs_dablk_t lblkno;
1969
1970 ASSERT(!(args->flags & ATTR_KERNOVAL));
1971
1972 mp = args->dp->i_mount;
1973 dst = args->value;
1974 valuelen = args->valuelen;
1975 lblkno = args->rmtblkno;
1976 while (valuelen > 0) {
1977 nmap = ATTR_RMTVALUE_MAPSIZE;
1978 error = xfs_bmapi(args->trans, args->dp, (xfs_fileoff_t)lblkno,
1979 args->rmtblkcnt,
1980 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
1981 NULL, 0, map, &nmap, NULL);
1982 if (error)
1983 return(error);
1984 ASSERT(nmap >= 1);
1985
1986 for (i = 0; (i < nmap) && (valuelen > 0); i++) {
1987 ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) &&
1988 (map[i].br_startblock != HOLESTARTBLOCK));
1989 dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock);
1990 blkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
1991 error = xfs_read_buf(mp, mp->m_ddev_targp, dblkno,
1992 blkcnt, XBF_LOCK | XBF_DONT_BLOCK,
1993 &bp);
1994 if (error)
1995 return(error);
1996
1997 tmp = (valuelen < XFS_BUF_SIZE(bp))
1998 ? valuelen : XFS_BUF_SIZE(bp);
1999 xfs_buf_iomove(bp, 0, tmp, dst, XBRW_READ);
2000 xfs_buf_relse(bp);
2001 dst += tmp;
2002 valuelen -= tmp;
2003
2004 lblkno += map[i].br_blockcount;
2005 }
2006 }
2007 ASSERT(valuelen == 0);
2008 return(0);
2009 }
2010
2011 /*
2012 * Write the value associated with an attribute into the out-of-line buffer
2013 * that we have defined for it.
2014 */
2015 STATIC int
2016 xfs_attr_rmtval_set(xfs_da_args_t *args)
2017 {
2018 xfs_mount_t *mp;
2019 xfs_fileoff_t lfileoff;
2020 xfs_inode_t *dp;
2021 xfs_bmbt_irec_t map;
2022 xfs_daddr_t dblkno;
2023 void *src;
2024 xfs_buf_t *bp;
2025 xfs_dablk_t lblkno;
2026 int blkcnt, valuelen, nmap, error, tmp, committed;
2027
2028 dp = args->dp;
2029 mp = dp->i_mount;
2030 src = args->value;
2031
2032 /*
2033 * Find a "hole" in the attribute address space large enough for
2034 * us to drop the new attribute's value into.
2035 */
2036 blkcnt = XFS_B_TO_FSB(mp, args->valuelen);
2037 lfileoff = 0;
2038 error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff,
2039 XFS_ATTR_FORK);
2040 if (error) {
2041 return(error);
2042 }
2043 args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff;
2044 args->rmtblkcnt = blkcnt;
2045
2046 /*
2047 * Roll through the "value", allocating blocks on disk as required.
2048 */
2049 while (blkcnt > 0) {
2050 /*
2051 * Allocate a single extent, up to the size of the value.
2052 */
2053 xfs_bmap_init(args->flist, args->firstblock);
2054 nmap = 1;
2055 error = xfs_bmapi(args->trans, dp, (xfs_fileoff_t)lblkno,
2056 blkcnt,
2057 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA |
2058 XFS_BMAPI_WRITE,
2059 args->firstblock, args->total, &map, &nmap,
2060 args->flist);
2061 if (!error) {
2062 error = xfs_bmap_finish(&args->trans, args->flist,
2063 &committed);
2064 }
2065 if (error) {
2066 ASSERT(committed);
2067 args->trans = NULL;
2068 xfs_bmap_cancel(args->flist);
2069 return(error);
2070 }
2071
2072 /*
2073 * bmap_finish() may have committed the last trans and started
2074 * a new one. We need the inode to be in all transactions.
2075 */
2076 if (committed)
2077 xfs_trans_ijoin(args->trans, dp);
2078
2079 ASSERT(nmap == 1);
2080 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2081 (map.br_startblock != HOLESTARTBLOCK));
2082 lblkno += map.br_blockcount;
2083 blkcnt -= map.br_blockcount;
2084
2085 /*
2086 * Start the next trans in the chain.
2087 */
2088 error = xfs_trans_roll(&args->trans, dp);
2089 if (error)
2090 return (error);
2091 }
2092
2093 /*
2094 * Roll through the "value", copying the attribute value to the
2095 * already-allocated blocks. Blocks are written synchronously
2096 * so that we can know they are all on disk before we turn off
2097 * the INCOMPLETE flag.
2098 */
2099 lblkno = args->rmtblkno;
2100 valuelen = args->valuelen;
2101 while (valuelen > 0) {
2102 /*
2103 * Try to remember where we decided to put the value.
2104 */
2105 xfs_bmap_init(args->flist, args->firstblock);
2106 nmap = 1;
2107 error = xfs_bmapi(NULL, dp, (xfs_fileoff_t)lblkno,
2108 args->rmtblkcnt,
2109 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2110 args->firstblock, 0, &map, &nmap,
2111 NULL);
2112 if (error) {
2113 return(error);
2114 }
2115 ASSERT(nmap == 1);
2116 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2117 (map.br_startblock != HOLESTARTBLOCK));
2118
2119 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
2120 blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
2121
2122 bp = xfs_buf_get(mp->m_ddev_targp, dblkno, blkcnt,
2123 XBF_LOCK | XBF_DONT_BLOCK);
2124 ASSERT(!xfs_buf_geterror(bp));
2125
2126 tmp = (valuelen < XFS_BUF_SIZE(bp)) ? valuelen :
2127 XFS_BUF_SIZE(bp);
2128 xfs_buf_iomove(bp, 0, tmp, src, XBRW_WRITE);
2129 if (tmp < XFS_BUF_SIZE(bp))
2130 xfs_buf_zero(bp, tmp, XFS_BUF_SIZE(bp) - tmp);
2131 if ((error = xfs_bwrite(mp, bp))) {/* GROT: NOTE: synchronous write */
2132 return (error);
2133 }
2134 src += tmp;
2135 valuelen -= tmp;
2136
2137 lblkno += map.br_blockcount;
2138 }
2139 ASSERT(valuelen == 0);
2140 return(0);
2141 }
2142
2143 /*
2144 * Remove the value associated with an attribute by deleting the
2145 * out-of-line buffer that it is stored on.
2146 */
2147 STATIC int
2148 xfs_attr_rmtval_remove(xfs_da_args_t *args)
2149 {
2150 xfs_mount_t *mp;
2151 xfs_bmbt_irec_t map;
2152 xfs_buf_t *bp;
2153 xfs_daddr_t dblkno;
2154 xfs_dablk_t lblkno;
2155 int valuelen, blkcnt, nmap, error, done, committed;
2156
2157 mp = args->dp->i_mount;
2158
2159 /*
2160 * Roll through the "value", invalidating the attribute value's
2161 * blocks.
2162 */
2163 lblkno = args->rmtblkno;
2164 valuelen = args->rmtblkcnt;
2165 while (valuelen > 0) {
2166 /*
2167 * Try to remember where we decided to put the value.
2168 */
2169 xfs_bmap_init(args->flist, args->firstblock);
2170 nmap = 1;
2171 error = xfs_bmapi(NULL, args->dp, (xfs_fileoff_t)lblkno,
2172 args->rmtblkcnt,
2173 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2174 args->firstblock, 0, &map, &nmap,
2175 args->flist);
2176 if (error) {
2177 return(error);
2178 }
2179 ASSERT(nmap == 1);
2180 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2181 (map.br_startblock != HOLESTARTBLOCK));
2182
2183 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
2184 blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
2185
2186 /*
2187 * If the "remote" value is in the cache, remove it.
2188 */
2189 bp = xfs_incore(mp->m_ddev_targp, dblkno, blkcnt, XBF_TRYLOCK);
2190 if (bp) {
2191 XFS_BUF_STALE(bp);
2192 XFS_BUF_UNDELAYWRITE(bp);
2193 xfs_buf_relse(bp);
2194 bp = NULL;
2195 }
2196
2197 valuelen -= map.br_blockcount;
2198
2199 lblkno += map.br_blockcount;
2200 }
2201
2202 /*
2203 * Keep de-allocating extents until the remote-value region is gone.
2204 */
2205 lblkno = args->rmtblkno;
2206 blkcnt = args->rmtblkcnt;
2207 done = 0;
2208 while (!done) {
2209 xfs_bmap_init(args->flist, args->firstblock);
2210 error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt,
2211 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2212 1, args->firstblock, args->flist,
2213 &done);
2214 if (!error) {
2215 error = xfs_bmap_finish(&args->trans, args->flist,
2216 &committed);
2217 }
2218 if (error) {
2219 ASSERT(committed);
2220 args->trans = NULL;
2221 xfs_bmap_cancel(args->flist);
2222 return(error);
2223 }
2224
2225 /*
2226 * bmap_finish() may have committed the last trans and started
2227 * a new one. We need the inode to be in all transactions.
2228 */
2229 if (committed)
2230 xfs_trans_ijoin(args->trans, args->dp);
2231
2232 /*
2233 * Close out trans and start the next one in the chain.
2234 */
2235 error = xfs_trans_roll(&args->trans, args->dp);
2236 if (error)
2237 return (error);
2238 }
2239 return(0);
2240 }
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