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s390/monwriter: fix smatch warning for strcpy()
[linux-2.6/btrfs-unstable.git] / fs / xfs / xfs_attr.c
blobddcf2267ffa6fdf1bcf33cf7439c6b379472c2b4
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 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_format.h"
21 #include "xfs_bit.h"
22 #include "xfs_log.h"
23 #include "xfs_trans.h"
24 #include "xfs_trans_priv.h"
25 #include "xfs_sb.h"
26 #include "xfs_ag.h"
27 #include "xfs_mount.h"
28 #include "xfs_da_btree.h"
29 #include "xfs_bmap_btree.h"
30 #include "xfs_attr_sf.h"
31 #include "xfs_dinode.h"
32 #include "xfs_inode.h"
33 #include "xfs_alloc.h"
34 #include "xfs_inode_item.h"
35 #include "xfs_bmap.h"
36 #include "xfs_bmap_util.h"
37 #include "xfs_attr.h"
38 #include "xfs_attr_leaf.h"
39 #include "xfs_attr_remote.h"
40 #include "xfs_error.h"
41 #include "xfs_quota.h"
42 #include "xfs_trans_space.h"
43 #include "xfs_trace.h"
44
45 /*
46 * xfs_attr.c
47 *
48 * Provide the external interfaces to manage attribute lists.
49 */
50
51 /*========================================================================
52 * Function prototypes for the kernel.
53 *========================================================================*/
54
55 /*
56 * Internal routines when attribute list fits inside the inode.
57 */
58 STATIC int xfs_attr_shortform_addname(xfs_da_args_t *args);
59
60 /*
61 * Internal routines when attribute list is one block.
62 */
63 STATIC int xfs_attr_leaf_get(xfs_da_args_t *args);
64 STATIC int xfs_attr_leaf_addname(xfs_da_args_t *args);
65 STATIC int xfs_attr_leaf_removename(xfs_da_args_t *args);
66
67 /*
68 * Internal routines when attribute list is more than one block.
69 */
70 STATIC int xfs_attr_node_get(xfs_da_args_t *args);
71 STATIC int xfs_attr_node_addname(xfs_da_args_t *args);
72 STATIC int xfs_attr_node_removename(xfs_da_args_t *args);
73 STATIC int xfs_attr_fillstate(xfs_da_state_t *state);
74 STATIC int xfs_attr_refillstate(xfs_da_state_t *state);
75
76
77 STATIC int
78 xfs_attr_name_to_xname(
79 struct xfs_name *xname,
80 const unsigned char *aname)
81 {
82 if (!aname)
83 return EINVAL;
84 xname->name = aname;
85 xname->len = strlen((char *)aname);
86 if (xname->len >= MAXNAMELEN)
87 return EFAULT; /* match IRIX behaviour */
88
89 return 0;
90 }
91
92 int
93 xfs_inode_hasattr(
94 struct xfs_inode *ip)
95 {
96 if (!XFS_IFORK_Q(ip) ||
97 (ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
98 ip->i_d.di_anextents == 0))
99 return 0;
100 return 1;
101 }
102
103 /*========================================================================
104 * Overall external interface routines.
105 *========================================================================*/
106
107 STATIC int
108 xfs_attr_get_int(
109 struct xfs_inode *ip,
110 struct xfs_name *name,
111 unsigned char *value,
112 int *valuelenp,
113 int flags)
114 {
115 xfs_da_args_t args;
116 int error;
117
118 if (!xfs_inode_hasattr(ip))
119 return ENOATTR;
120
121 /*
122 * Fill in the arg structure for this request.
123 */
124 memset((char *)&args, 0, sizeof(args));
125 args.name = name->name;
126 args.namelen = name->len;
127 args.value = value;
128 args.valuelen = *valuelenp;
129 args.flags = flags;
130 args.hashval = xfs_da_hashname(args.name, args.namelen);
131 args.dp = ip;
132 args.whichfork = XFS_ATTR_FORK;
133
134 /*
135 * Decide on what work routines to call based on the inode size.
136 */
137 if (ip->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
138 error = xfs_attr_shortform_getvalue(&args);
139 } else if (xfs_bmap_one_block(ip, XFS_ATTR_FORK)) {
140 error = xfs_attr_leaf_get(&args);
141 } else {
142 error = xfs_attr_node_get(&args);
143 }
144
145 /*
146 * Return the number of bytes in the value to the caller.
147 */
148 *valuelenp = args.valuelen;
149
150 if (error == EEXIST)
151 error = 0;
152 return(error);
153 }
154
155 int
156 xfs_attr_get(
157 xfs_inode_t *ip,
158 const unsigned char *name,
159 unsigned char *value,
160 int *valuelenp,
161 int flags)
162 {
163 int error;
164 struct xfs_name xname;
165
166 XFS_STATS_INC(xs_attr_get);
167
168 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
169 return(EIO);
170
171 error = xfs_attr_name_to_xname(&xname, name);
172 if (error)
173 return error;
174
175 xfs_ilock(ip, XFS_ILOCK_SHARED);
176 error = xfs_attr_get_int(ip, &xname, value, valuelenp, flags);
177 xfs_iunlock(ip, XFS_ILOCK_SHARED);
178 return(error);
179 }
180
181 /*
182 * Calculate how many blocks we need for the new attribute,
183 */
184 STATIC int
185 xfs_attr_calc_size(
186 struct xfs_inode *ip,
187 int namelen,
188 int valuelen,
189 int *local)
190 {
191 struct xfs_mount *mp = ip->i_mount;
192 int size;
193 int nblks;
194
195 /*
196 * Determine space new attribute will use, and if it would be
197 * "local" or "remote" (note: local != inline).
198 */
199 size = xfs_attr_leaf_newentsize(namelen, valuelen,
200 mp->m_sb.sb_blocksize, local);
201
202 nblks = XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK);
203 if (*local) {
204 if (size > (mp->m_sb.sb_blocksize >> 1)) {
205 /* Double split possible */
206 nblks *= 2;
207 }
208 } else {
209 /*
210 * Out of line attribute, cannot double split, but
211 * make room for the attribute value itself.
212 */
213 uint dblocks = XFS_B_TO_FSB(mp, valuelen);
214 nblks += dblocks;
215 nblks += XFS_NEXTENTADD_SPACE_RES(mp, dblocks, XFS_ATTR_FORK);
216 }
217
218 return nblks;
219 }
220
221 STATIC int
222 xfs_attr_set_int(
223 struct xfs_inode *dp,
224 struct xfs_name *name,
225 unsigned char *value,
226 int valuelen,
227 int flags)
228 {
229 xfs_da_args_t args;
230 xfs_fsblock_t firstblock;
231 xfs_bmap_free_t flist;
232 int error, err2, committed;
233 struct xfs_mount *mp = dp->i_mount;
234 struct xfs_trans_res tres;
235 int rsvd = (flags & ATTR_ROOT) != 0;
236 int local;
237
238 /*
239 * Attach the dquots to the inode.
240 */
241 error = xfs_qm_dqattach(dp, 0);
242 if (error)
243 return error;
244
245 /*
246 * If the inode doesn't have an attribute fork, add one.
247 * (inode must not be locked when we call this routine)
248 */
249 if (XFS_IFORK_Q(dp) == 0) {
250 int sf_size = sizeof(xfs_attr_sf_hdr_t) +
251 XFS_ATTR_SF_ENTSIZE_BYNAME(name->len, valuelen);
252
253 if ((error = xfs_bmap_add_attrfork(dp, sf_size, rsvd)))
254 return(error);
255 }
256
257 /*
258 * Fill in the arg structure for this request.
259 */
260 memset((char *)&args, 0, sizeof(args));
261 args.name = name->name;
262 args.namelen = name->len;
263 args.value = value;
264 args.valuelen = valuelen;
265 args.flags = flags;
266 args.hashval = xfs_da_hashname(args.name, args.namelen);
267 args.dp = dp;
268 args.firstblock = &firstblock;
269 args.flist = &flist;
270 args.whichfork = XFS_ATTR_FORK;
271 args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
272
273 /* Size is now blocks for attribute data */
274 args.total = xfs_attr_calc_size(dp, name->len, valuelen, &local);
275
276 /*
277 * Start our first transaction of the day.
278 *
279 * All future transactions during this code must be "chained" off
280 * this one via the trans_dup() call. All transactions will contain
281 * the inode, and the inode will always be marked with trans_ihold().
282 * Since the inode will be locked in all transactions, we must log
283 * the inode in every transaction to let it float upward through
284 * the log.
285 */
286 args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_SET);
287
288 /*
289 * Root fork attributes can use reserved data blocks for this
290 * operation if necessary
291 */
292
293 if (rsvd)
294 args.trans->t_flags |= XFS_TRANS_RESERVE;
295
296 tres.tr_logres = M_RES(mp)->tr_attrsetm.tr_logres +
297 M_RES(mp)->tr_attrsetrt.tr_logres * args.total;
298 tres.tr_logcount = XFS_ATTRSET_LOG_COUNT;
299 tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
300 error = xfs_trans_reserve(args.trans, &tres, args.total, 0);
301 if (error) {
302 xfs_trans_cancel(args.trans, 0);
303 return(error);
304 }
305 xfs_ilock(dp, XFS_ILOCK_EXCL);
306
307 error = xfs_trans_reserve_quota_nblks(args.trans, dp, args.total, 0,
308 rsvd ? XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
309 XFS_QMOPT_RES_REGBLKS);
310 if (error) {
311 xfs_iunlock(dp, XFS_ILOCK_EXCL);
312 xfs_trans_cancel(args.trans, XFS_TRANS_RELEASE_LOG_RES);
313 return (error);
314 }
315
316 xfs_trans_ijoin(args.trans, dp, 0);
317
318 /*
319 * If the attribute list is non-existent or a shortform list,
320 * upgrade it to a single-leaf-block attribute list.
321 */
322 if ((dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
323 ((dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS) &&
324 (dp->i_d.di_anextents == 0))) {
325
326 /*
327 * Build initial attribute list (if required).
328 */
329 if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS)
330 xfs_attr_shortform_create(&args);
331
332 /*
333 * Try to add the attr to the attribute list in
334 * the inode.
335 */
336 error = xfs_attr_shortform_addname(&args);
337 if (error != ENOSPC) {
338 /*
339 * Commit the shortform mods, and we're done.
340 * NOTE: this is also the error path (EEXIST, etc).
341 */
342 ASSERT(args.trans != NULL);
343
344 /*
345 * If this is a synchronous mount, make sure that
346 * the transaction goes to disk before returning
347 * to the user.
348 */
349 if (mp->m_flags & XFS_MOUNT_WSYNC) {
350 xfs_trans_set_sync(args.trans);
351 }
352
353 if (!error && (flags & ATTR_KERNOTIME) == 0) {
354 xfs_trans_ichgtime(args.trans, dp,
355 XFS_ICHGTIME_CHG);
356 }
357 err2 = xfs_trans_commit(args.trans,
358 XFS_TRANS_RELEASE_LOG_RES);
359 xfs_iunlock(dp, XFS_ILOCK_EXCL);
360
361 return(error == 0 ? err2 : error);
362 }
363
364 /*
365 * It won't fit in the shortform, transform to a leaf block.
366 * GROT: another possible req'mt for a double-split btree op.
367 */
368 xfs_bmap_init(args.flist, args.firstblock);
369 error = xfs_attr_shortform_to_leaf(&args);
370 if (!error) {
371 error = xfs_bmap_finish(&args.trans, args.flist,
372 &committed);
373 }
374 if (error) {
375 ASSERT(committed);
376 args.trans = NULL;
377 xfs_bmap_cancel(&flist);
378 goto out;
379 }
380
381 /*
382 * bmap_finish() may have committed the last trans and started
383 * a new one. We need the inode to be in all transactions.
384 */
385 if (committed)
386 xfs_trans_ijoin(args.trans, dp, 0);
387
388 /*
389 * Commit the leaf transformation. We'll need another (linked)
390 * transaction to add the new attribute to the leaf.
391 */
392
393 error = xfs_trans_roll(&args.trans, dp);
394 if (error)
395 goto out;
396
397 }
398
399 if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
400 error = xfs_attr_leaf_addname(&args);
401 } else {
402 error = xfs_attr_node_addname(&args);
403 }
404 if (error) {
405 goto out;
406 }
407
408 /*
409 * If this is a synchronous mount, make sure that the
410 * transaction goes to disk before returning to the user.
411 */
412 if (mp->m_flags & XFS_MOUNT_WSYNC) {
413 xfs_trans_set_sync(args.trans);
414 }
415
416 if ((flags & ATTR_KERNOTIME) == 0)
417 xfs_trans_ichgtime(args.trans, dp, XFS_ICHGTIME_CHG);
418
419 /*
420 * Commit the last in the sequence of transactions.
421 */
422 xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
423 error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES);
424 xfs_iunlock(dp, XFS_ILOCK_EXCL);
425
426 return(error);
427
428 out:
429 if (args.trans)
430 xfs_trans_cancel(args.trans,
431 XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
432 xfs_iunlock(dp, XFS_ILOCK_EXCL);
433 return(error);
434 }
435
436 int
437 xfs_attr_set(
438 xfs_inode_t *dp,
439 const unsigned char *name,
440 unsigned char *value,
441 int valuelen,
442 int flags)
443 {
444 int error;
445 struct xfs_name xname;
446
447 XFS_STATS_INC(xs_attr_set);
448
449 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
450 return (EIO);
451
452 error = xfs_attr_name_to_xname(&xname, name);
453 if (error)
454 return error;
455
456 return xfs_attr_set_int(dp, &xname, value, valuelen, flags);
457 }
458
459 /*
460 * Generic handler routine to remove a name from an attribute list.
461 * Transitions attribute list from Btree to shortform as necessary.
462 */
463 STATIC int
464 xfs_attr_remove_int(xfs_inode_t *dp, struct xfs_name *name, int flags)
465 {
466 xfs_da_args_t args;
467 xfs_fsblock_t firstblock;
468 xfs_bmap_free_t flist;
469 int error;
470 xfs_mount_t *mp = dp->i_mount;
471
472 /*
473 * Fill in the arg structure for this request.
474 */
475 memset((char *)&args, 0, sizeof(args));
476 args.name = name->name;
477 args.namelen = name->len;
478 args.flags = flags;
479 args.hashval = xfs_da_hashname(args.name, args.namelen);
480 args.dp = dp;
481 args.firstblock = &firstblock;
482 args.flist = &flist;
483 args.total = 0;
484 args.whichfork = XFS_ATTR_FORK;
485
486 /*
487 * we have no control over the attribute names that userspace passes us
488 * to remove, so we have to allow the name lookup prior to attribute
489 * removal to fail.
490 */
491 args.op_flags = XFS_DA_OP_OKNOENT;
492
493 /*
494 * Attach the dquots to the inode.
495 */
496 error = xfs_qm_dqattach(dp, 0);
497 if (error)
498 return error;
499
500 /*
501 * Start our first transaction of the day.
502 *
503 * All future transactions during this code must be "chained" off
504 * this one via the trans_dup() call. All transactions will contain
505 * the inode, and the inode will always be marked with trans_ihold().
506 * Since the inode will be locked in all transactions, we must log
507 * the inode in every transaction to let it float upward through
508 * the log.
509 */
510 args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_RM);
511
512 /*
513 * Root fork attributes can use reserved data blocks for this
514 * operation if necessary
515 */
516
517 if (flags & ATTR_ROOT)
518 args.trans->t_flags |= XFS_TRANS_RESERVE;
519
520 error = xfs_trans_reserve(args.trans, &M_RES(mp)->tr_attrrm,
521 XFS_ATTRRM_SPACE_RES(mp), 0);
522 if (error) {
523 xfs_trans_cancel(args.trans, 0);
524 return(error);
525 }
526
527 xfs_ilock(dp, XFS_ILOCK_EXCL);
528 /*
529 * No need to make quota reservations here. We expect to release some
530 * blocks not allocate in the common case.
531 */
532 xfs_trans_ijoin(args.trans, dp, 0);
533
534 /*
535 * Decide on what work routines to call based on the inode size.
536 */
537 if (!xfs_inode_hasattr(dp)) {
538 error = XFS_ERROR(ENOATTR);
539 goto out;
540 }
541 if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
542 ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
543 error = xfs_attr_shortform_remove(&args);
544 if (error) {
545 goto out;
546 }
547 } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
548 error = xfs_attr_leaf_removename(&args);
549 } else {
550 error = xfs_attr_node_removename(&args);
551 }
552 if (error) {
553 goto out;
554 }
555
556 /*
557 * If this is a synchronous mount, make sure that the
558 * transaction goes to disk before returning to the user.
559 */
560 if (mp->m_flags & XFS_MOUNT_WSYNC) {
561 xfs_trans_set_sync(args.trans);
562 }
563
564 if ((flags & ATTR_KERNOTIME) == 0)
565 xfs_trans_ichgtime(args.trans, dp, XFS_ICHGTIME_CHG);
566
567 /*
568 * Commit the last in the sequence of transactions.
569 */
570 xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
571 error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES);
572 xfs_iunlock(dp, XFS_ILOCK_EXCL);
573
574 return(error);
575
576 out:
577 if (args.trans)
578 xfs_trans_cancel(args.trans,
579 XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
580 xfs_iunlock(dp, XFS_ILOCK_EXCL);
581 return(error);
582 }
583
584 int
585 xfs_attr_remove(
586 xfs_inode_t *dp,
587 const unsigned char *name,
588 int flags)
589 {
590 int error;
591 struct xfs_name xname;
592
593 XFS_STATS_INC(xs_attr_remove);
594
595 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
596 return (EIO);
597
598 error = xfs_attr_name_to_xname(&xname, name);
599 if (error)
600 return error;
601
602 xfs_ilock(dp, XFS_ILOCK_SHARED);
603 if (!xfs_inode_hasattr(dp)) {
604 xfs_iunlock(dp, XFS_ILOCK_SHARED);
605 return XFS_ERROR(ENOATTR);
606 }
607 xfs_iunlock(dp, XFS_ILOCK_SHARED);
608
609 return xfs_attr_remove_int(dp, &xname, flags);
610 }
611
612
613 /*========================================================================
614 * External routines when attribute list is inside the inode
615 *========================================================================*/
616
617 /*
618 * Add a name to the shortform attribute list structure
619 * This is the external routine.
620 */
621 STATIC int
622 xfs_attr_shortform_addname(xfs_da_args_t *args)
623 {
624 int newsize, forkoff, retval;
625
626 trace_xfs_attr_sf_addname(args);
627
628 retval = xfs_attr_shortform_lookup(args);
629 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
630 return(retval);
631 } else if (retval == EEXIST) {
632 if (args->flags & ATTR_CREATE)
633 return(retval);
634 retval = xfs_attr_shortform_remove(args);
635 ASSERT(retval == 0);
636 }
637
638 if (args->namelen >= XFS_ATTR_SF_ENTSIZE_MAX ||
639 args->valuelen >= XFS_ATTR_SF_ENTSIZE_MAX)
640 return(XFS_ERROR(ENOSPC));
641
642 newsize = XFS_ATTR_SF_TOTSIZE(args->dp);
643 newsize += XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
644
645 forkoff = xfs_attr_shortform_bytesfit(args->dp, newsize);
646 if (!forkoff)
647 return(XFS_ERROR(ENOSPC));
648
649 xfs_attr_shortform_add(args, forkoff);
650 return(0);
651 }
652
653
654 /*========================================================================
655 * External routines when attribute list is one block
656 *========================================================================*/
657
658 /*
659 * Add a name to the leaf attribute list structure
660 *
661 * This leaf block cannot have a "remote" value, we only call this routine
662 * if bmap_one_block() says there is only one block (ie: no remote blks).
663 */
664 STATIC int
665 xfs_attr_leaf_addname(xfs_da_args_t *args)
666 {
667 xfs_inode_t *dp;
668 struct xfs_buf *bp;
669 int retval, error, committed, forkoff;
670
671 trace_xfs_attr_leaf_addname(args);
672
673 /*
674 * Read the (only) block in the attribute list in.
675 */
676 dp = args->dp;
677 args->blkno = 0;
678 error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, -1, &bp);
679 if (error)
680 return error;
681
682 /*
683 * Look up the given attribute in the leaf block. Figure out if
684 * the given flags produce an error or call for an atomic rename.
685 */
686 retval = xfs_attr3_leaf_lookup_int(bp, args);
687 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
688 xfs_trans_brelse(args->trans, bp);
689 return retval;
690 } else if (retval == EEXIST) {
691 if (args->flags & ATTR_CREATE) { /* pure create op */
692 xfs_trans_brelse(args->trans, bp);
693 return retval;
694 }
695
696 trace_xfs_attr_leaf_replace(args);
697
698 args->op_flags |= XFS_DA_OP_RENAME; /* an atomic rename */
699 args->blkno2 = args->blkno; /* set 2nd entry info*/
700 args->index2 = args->index;
701 args->rmtblkno2 = args->rmtblkno;
702 args->rmtblkcnt2 = args->rmtblkcnt;
703 }
704
705 /*
706 * Add the attribute to the leaf block, transitioning to a Btree
707 * if required.
708 */
709 retval = xfs_attr3_leaf_add(bp, args);
710 if (retval == ENOSPC) {
711 /*
712 * Promote the attribute list to the Btree format, then
713 * Commit that transaction so that the node_addname() call
714 * can manage its own transactions.
715 */
716 xfs_bmap_init(args->flist, args->firstblock);
717 error = xfs_attr3_leaf_to_node(args);
718 if (!error) {
719 error = xfs_bmap_finish(&args->trans, args->flist,
720 &committed);
721 }
722 if (error) {
723 ASSERT(committed);
724 args->trans = NULL;
725 xfs_bmap_cancel(args->flist);
726 return(error);
727 }
728
729 /*
730 * bmap_finish() may have committed the last trans and started
731 * a new one. We need the inode to be in all transactions.
732 */
733 if (committed)
734 xfs_trans_ijoin(args->trans, dp, 0);
735
736 /*
737 * Commit the current trans (including the inode) and start
738 * a new one.
739 */
740 error = xfs_trans_roll(&args->trans, dp);
741 if (error)
742 return (error);
743
744 /*
745 * Fob the whole rest of the problem off on the Btree code.
746 */
747 error = xfs_attr_node_addname(args);
748 return(error);
749 }
750
751 /*
752 * Commit the transaction that added the attr name so that
753 * later routines can manage their own transactions.
754 */
755 error = xfs_trans_roll(&args->trans, dp);
756 if (error)
757 return (error);
758
759 /*
760 * If there was an out-of-line value, allocate the blocks we
761 * identified for its storage and copy the value. This is done
762 * after we create the attribute so that we don't overflow the
763 * maximum size of a transaction and/or hit a deadlock.
764 */
765 if (args->rmtblkno > 0) {
766 error = xfs_attr_rmtval_set(args);
767 if (error)
768 return(error);
769 }
770
771 /*
772 * If this is an atomic rename operation, we must "flip" the
773 * incomplete flags on the "new" and "old" attribute/value pairs
774 * so that one disappears and one appears atomically. Then we
775 * must remove the "old" attribute/value pair.
776 */
777 if (args->op_flags & XFS_DA_OP_RENAME) {
778 /*
779 * In a separate transaction, set the incomplete flag on the
780 * "old" attr and clear the incomplete flag on the "new" attr.
781 */
782 error = xfs_attr3_leaf_flipflags(args);
783 if (error)
784 return(error);
785
786 /*
787 * Dismantle the "old" attribute/value pair by removing
788 * a "remote" value (if it exists).
789 */
790 args->index = args->index2;
791 args->blkno = args->blkno2;
792 args->rmtblkno = args->rmtblkno2;
793 args->rmtblkcnt = args->rmtblkcnt2;
794 if (args->rmtblkno) {
795 error = xfs_attr_rmtval_remove(args);
796 if (error)
797 return(error);
798 }
799
800 /*
801 * Read in the block containing the "old" attr, then
802 * remove the "old" attr from that block (neat, huh!)
803 */
804 error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno,
805 -1, &bp);
806 if (error)
807 return error;
808
809 xfs_attr3_leaf_remove(bp, args);
810
811 /*
812 * If the result is small enough, shrink it all into the inode.
813 */
814 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
815 xfs_bmap_init(args->flist, args->firstblock);
816 error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
817 /* bp is gone due to xfs_da_shrink_inode */
818 if (!error) {
819 error = xfs_bmap_finish(&args->trans,
820 args->flist,
821 &committed);
822 }
823 if (error) {
824 ASSERT(committed);
825 args->trans = NULL;
826 xfs_bmap_cancel(args->flist);
827 return(error);
828 }
829
830 /*
831 * bmap_finish() may have committed the last trans
832 * and started a new one. We need the inode to be
833 * in all transactions.
834 */
835 if (committed)
836 xfs_trans_ijoin(args->trans, dp, 0);
837 }
838
839 /*
840 * Commit the remove and start the next trans in series.
841 */
842 error = xfs_trans_roll(&args->trans, dp);
843
844 } else if (args->rmtblkno > 0) {
845 /*
846 * Added a "remote" value, just clear the incomplete flag.
847 */
848 error = xfs_attr3_leaf_clearflag(args);
849 }
850 return error;
851 }
852
853 /*
854 * Remove a name from the leaf attribute list structure
855 *
856 * This leaf block cannot have a "remote" value, we only call this routine
857 * if bmap_one_block() says there is only one block (ie: no remote blks).
858 */
859 STATIC int
860 xfs_attr_leaf_removename(xfs_da_args_t *args)
861 {
862 xfs_inode_t *dp;
863 struct xfs_buf *bp;
864 int error, committed, forkoff;
865
866 trace_xfs_attr_leaf_removename(args);
867
868 /*
869 * Remove the attribute.
870 */
871 dp = args->dp;
872 args->blkno = 0;
873 error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, -1, &bp);
874 if (error)
875 return error;
876
877 error = xfs_attr3_leaf_lookup_int(bp, args);
878 if (error == ENOATTR) {
879 xfs_trans_brelse(args->trans, bp);
880 return error;
881 }
882
883 xfs_attr3_leaf_remove(bp, args);
884
885 /*
886 * If the result is small enough, shrink it all into the inode.
887 */
888 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
889 xfs_bmap_init(args->flist, args->firstblock);
890 error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
891 /* bp is gone due to xfs_da_shrink_inode */
892 if (!error) {
893 error = xfs_bmap_finish(&args->trans, args->flist,
894 &committed);
895 }
896 if (error) {
897 ASSERT(committed);
898 args->trans = NULL;
899 xfs_bmap_cancel(args->flist);
900 return error;
901 }
902
903 /*
904 * bmap_finish() may have committed the last trans and started
905 * a new one. We need the inode to be in all transactions.
906 */
907 if (committed)
908 xfs_trans_ijoin(args->trans, dp, 0);
909 }
910 return 0;
911 }
912
913 /*
914 * Look up a name in a leaf attribute list structure.
915 *
916 * This leaf block cannot have a "remote" value, we only call this routine
917 * if bmap_one_block() says there is only one block (ie: no remote blks).
918 */
919 STATIC int
920 xfs_attr_leaf_get(xfs_da_args_t *args)
921 {
922 struct xfs_buf *bp;
923 int error;
924
925 trace_xfs_attr_leaf_get(args);
926
927 args->blkno = 0;
928 error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, -1, &bp);
929 if (error)
930 return error;
931
932 error = xfs_attr3_leaf_lookup_int(bp, args);
933 if (error != EEXIST) {
934 xfs_trans_brelse(args->trans, bp);
935 return error;
936 }
937 error = xfs_attr3_leaf_getvalue(bp, args);
938 xfs_trans_brelse(args->trans, bp);
939 if (!error && (args->rmtblkno > 0) && !(args->flags & ATTR_KERNOVAL)) {
940 error = xfs_attr_rmtval_get(args);
941 }
942 return error;
943 }
944
945 /*========================================================================
946 * External routines when attribute list size > XFS_LBSIZE(mp).
947 *========================================================================*/
948
949 /*
950 * Add a name to a Btree-format attribute list.
951 *
952 * This will involve walking down the Btree, and may involve splitting
953 * leaf nodes and even splitting intermediate nodes up to and including
954 * the root node (a special case of an intermediate node).
955 *
956 * "Remote" attribute values confuse the issue and atomic rename operations
957 * add a whole extra layer of confusion on top of that.
958 */
959 STATIC int
960 xfs_attr_node_addname(xfs_da_args_t *args)
961 {
962 xfs_da_state_t *state;
963 xfs_da_state_blk_t *blk;
964 xfs_inode_t *dp;
965 xfs_mount_t *mp;
966 int committed, retval, error;
967
968 trace_xfs_attr_node_addname(args);
969
970 /*
971 * Fill in bucket of arguments/results/context to carry around.
972 */
973 dp = args->dp;
974 mp = dp->i_mount;
975 restart:
976 state = xfs_da_state_alloc();
977 state->args = args;
978 state->mp = mp;
979 state->blocksize = state->mp->m_sb.sb_blocksize;
980 state->node_ents = state->mp->m_attr_node_ents;
981
982 /*
983 * Search to see if name already exists, and get back a pointer
984 * to where it should go.
985 */
986 error = xfs_da3_node_lookup_int(state, &retval);
987 if (error)
988 goto out;
989 blk = &state->path.blk[ state->path.active-1 ];
990 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
991 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
992 goto out;
993 } else if (retval == EEXIST) {
994 if (args->flags & ATTR_CREATE)
995 goto out;
996
997 trace_xfs_attr_node_replace(args);
998
999 args->op_flags |= XFS_DA_OP_RENAME; /* atomic rename op */
1000 args->blkno2 = args->blkno; /* set 2nd entry info*/
1001 args->index2 = args->index;
1002 args->rmtblkno2 = args->rmtblkno;
1003 args->rmtblkcnt2 = args->rmtblkcnt;
1004 args->rmtblkno = 0;
1005 args->rmtblkcnt = 0;
1006 }
1007
1008 retval = xfs_attr3_leaf_add(blk->bp, state->args);
1009 if (retval == ENOSPC) {
1010 if (state->path.active == 1) {
1011 /*
1012 * Its really a single leaf node, but it had
1013 * out-of-line values so it looked like it *might*
1014 * have been a b-tree.
1015 */
1016 xfs_da_state_free(state);
1017 state = NULL;
1018 xfs_bmap_init(args->flist, args->firstblock);
1019 error = xfs_attr3_leaf_to_node(args);
1020 if (!error) {
1021 error = xfs_bmap_finish(&args->trans,
1022 args->flist,
1023 &committed);
1024 }
1025 if (error) {
1026 ASSERT(committed);
1027 args->trans = NULL;
1028 xfs_bmap_cancel(args->flist);
1029 goto out;
1030 }
1031
1032 /*
1033 * bmap_finish() may have committed the last trans
1034 * and started a new one. We need the inode to be
1035 * in all transactions.
1036 */
1037 if (committed)
1038 xfs_trans_ijoin(args->trans, dp, 0);
1039
1040 /*
1041 * Commit the node conversion and start the next
1042 * trans in the chain.
1043 */
1044 error = xfs_trans_roll(&args->trans, dp);
1045 if (error)
1046 goto out;
1047
1048 goto restart;
1049 }
1050
1051 /*
1052 * Split as many Btree elements as required.
1053 * This code tracks the new and old attr's location
1054 * in the index/blkno/rmtblkno/rmtblkcnt fields and
1055 * in the index2/blkno2/rmtblkno2/rmtblkcnt2 fields.
1056 */
1057 xfs_bmap_init(args->flist, args->firstblock);
1058 error = xfs_da3_split(state);
1059 if (!error) {
1060 error = xfs_bmap_finish(&args->trans, args->flist,
1061 &committed);
1062 }
1063 if (error) {
1064 ASSERT(committed);
1065 args->trans = NULL;
1066 xfs_bmap_cancel(args->flist);
1067 goto out;
1068 }
1069
1070 /*
1071 * bmap_finish() may have committed the last trans and started
1072 * a new one. We need the inode to be in all transactions.
1073 */
1074 if (committed)
1075 xfs_trans_ijoin(args->trans, dp, 0);
1076 } else {
1077 /*
1078 * Addition succeeded, update Btree hashvals.
1079 */
1080 xfs_da3_fixhashpath(state, &state->path);
1081 }
1082
1083 /*
1084 * Kill the state structure, we're done with it and need to
1085 * allow the buffers to come back later.
1086 */
1087 xfs_da_state_free(state);
1088 state = NULL;
1089
1090 /*
1091 * Commit the leaf addition or btree split and start the next
1092 * trans in the chain.
1093 */
1094 error = xfs_trans_roll(&args->trans, dp);
1095 if (error)
1096 goto out;
1097
1098 /*
1099 * If there was an out-of-line value, allocate the blocks we
1100 * identified for its storage and copy the value. This is done
1101 * after we create the attribute so that we don't overflow the
1102 * maximum size of a transaction and/or hit a deadlock.
1103 */
1104 if (args->rmtblkno > 0) {
1105 error = xfs_attr_rmtval_set(args);
1106 if (error)
1107 return(error);
1108 }
1109
1110 /*
1111 * If this is an atomic rename operation, we must "flip" the
1112 * incomplete flags on the "new" and "old" attribute/value pairs
1113 * so that one disappears and one appears atomically. Then we
1114 * must remove the "old" attribute/value pair.
1115 */
1116 if (args->op_flags & XFS_DA_OP_RENAME) {
1117 /*
1118 * In a separate transaction, set the incomplete flag on the
1119 * "old" attr and clear the incomplete flag on the "new" attr.
1120 */
1121 error = xfs_attr3_leaf_flipflags(args);
1122 if (error)
1123 goto out;
1124
1125 /*
1126 * Dismantle the "old" attribute/value pair by removing
1127 * a "remote" value (if it exists).
1128 */
1129 args->index = args->index2;
1130 args->blkno = args->blkno2;
1131 args->rmtblkno = args->rmtblkno2;
1132 args->rmtblkcnt = args->rmtblkcnt2;
1133 if (args->rmtblkno) {
1134 error = xfs_attr_rmtval_remove(args);
1135 if (error)
1136 return(error);
1137 }
1138
1139 /*
1140 * Re-find the "old" attribute entry after any split ops.
1141 * The INCOMPLETE flag means that we will find the "old"
1142 * attr, not the "new" one.
1143 */
1144 args->flags |= XFS_ATTR_INCOMPLETE;
1145 state = xfs_da_state_alloc();
1146 state->args = args;
1147 state->mp = mp;
1148 state->blocksize = state->mp->m_sb.sb_blocksize;
1149 state->node_ents = state->mp->m_attr_node_ents;
1150 state->inleaf = 0;
1151 error = xfs_da3_node_lookup_int(state, &retval);
1152 if (error)
1153 goto out;
1154
1155 /*
1156 * Remove the name and update the hashvals in the tree.
1157 */
1158 blk = &state->path.blk[ state->path.active-1 ];
1159 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1160 error = xfs_attr3_leaf_remove(blk->bp, args);
1161 xfs_da3_fixhashpath(state, &state->path);
1162
1163 /*
1164 * Check to see if the tree needs to be collapsed.
1165 */
1166 if (retval && (state->path.active > 1)) {
1167 xfs_bmap_init(args->flist, args->firstblock);
1168 error = xfs_da3_join(state);
1169 if (!error) {
1170 error = xfs_bmap_finish(&args->trans,
1171 args->flist,
1172 &committed);
1173 }
1174 if (error) {
1175 ASSERT(committed);
1176 args->trans = NULL;
1177 xfs_bmap_cancel(args->flist);
1178 goto out;
1179 }
1180
1181 /*
1182 * bmap_finish() may have committed the last trans
1183 * and started a new one. We need the inode to be
1184 * in all transactions.
1185 */
1186 if (committed)
1187 xfs_trans_ijoin(args->trans, dp, 0);
1188 }
1189
1190 /*
1191 * Commit and start the next trans in the chain.
1192 */
1193 error = xfs_trans_roll(&args->trans, dp);
1194 if (error)
1195 goto out;
1196
1197 } else if (args->rmtblkno > 0) {
1198 /*
1199 * Added a "remote" value, just clear the incomplete flag.
1200 */
1201 error = xfs_attr3_leaf_clearflag(args);
1202 if (error)
1203 goto out;
1204 }
1205 retval = error = 0;
1206
1207 out:
1208 if (state)
1209 xfs_da_state_free(state);
1210 if (error)
1211 return(error);
1212 return(retval);
1213 }
1214
1215 /*
1216 * Remove a name from a B-tree attribute list.
1217 *
1218 * This will involve walking down the Btree, and may involve joining
1219 * leaf nodes and even joining intermediate nodes up to and including
1220 * the root node (a special case of an intermediate node).
1221 */
1222 STATIC int
1223 xfs_attr_node_removename(xfs_da_args_t *args)
1224 {
1225 xfs_da_state_t *state;
1226 xfs_da_state_blk_t *blk;
1227 xfs_inode_t *dp;
1228 struct xfs_buf *bp;
1229 int retval, error, committed, forkoff;
1230
1231 trace_xfs_attr_node_removename(args);
1232
1233 /*
1234 * Tie a string around our finger to remind us where we are.
1235 */
1236 dp = args->dp;
1237 state = xfs_da_state_alloc();
1238 state->args = args;
1239 state->mp = dp->i_mount;
1240 state->blocksize = state->mp->m_sb.sb_blocksize;
1241 state->node_ents = state->mp->m_attr_node_ents;
1242
1243 /*
1244 * Search to see if name exists, and get back a pointer to it.
1245 */
1246 error = xfs_da3_node_lookup_int(state, &retval);
1247 if (error || (retval != EEXIST)) {
1248 if (error == 0)
1249 error = retval;
1250 goto out;
1251 }
1252
1253 /*
1254 * If there is an out-of-line value, de-allocate the blocks.
1255 * This is done before we remove the attribute so that we don't
1256 * overflow the maximum size of a transaction and/or hit a deadlock.
1257 */
1258 blk = &state->path.blk[ state->path.active-1 ];
1259 ASSERT(blk->bp != NULL);
1260 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1261 if (args->rmtblkno > 0) {
1262 /*
1263 * Fill in disk block numbers in the state structure
1264 * so that we can get the buffers back after we commit
1265 * several transactions in the following calls.
1266 */
1267 error = xfs_attr_fillstate(state);
1268 if (error)
1269 goto out;
1270
1271 /*
1272 * Mark the attribute as INCOMPLETE, then bunmapi() the
1273 * remote value.
1274 */
1275 error = xfs_attr3_leaf_setflag(args);
1276 if (error)
1277 goto out;
1278 error = xfs_attr_rmtval_remove(args);
1279 if (error)
1280 goto out;
1281
1282 /*
1283 * Refill the state structure with buffers, the prior calls
1284 * released our buffers.
1285 */
1286 error = xfs_attr_refillstate(state);
1287 if (error)
1288 goto out;
1289 }
1290
1291 /*
1292 * Remove the name and update the hashvals in the tree.
1293 */
1294 blk = &state->path.blk[ state->path.active-1 ];
1295 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1296 retval = xfs_attr3_leaf_remove(blk->bp, args);
1297 xfs_da3_fixhashpath(state, &state->path);
1298
1299 /*
1300 * Check to see if the tree needs to be collapsed.
1301 */
1302 if (retval && (state->path.active > 1)) {
1303 xfs_bmap_init(args->flist, args->firstblock);
1304 error = xfs_da3_join(state);
1305 if (!error) {
1306 error = xfs_bmap_finish(&args->trans, args->flist,
1307 &committed);
1308 }
1309 if (error) {
1310 ASSERT(committed);
1311 args->trans = NULL;
1312 xfs_bmap_cancel(args->flist);
1313 goto out;
1314 }
1315
1316 /*
1317 * bmap_finish() may have committed the last trans and started
1318 * a new one. We need the inode to be in all transactions.
1319 */
1320 if (committed)
1321 xfs_trans_ijoin(args->trans, dp, 0);
1322
1323 /*
1324 * Commit the Btree join operation and start a new trans.
1325 */
1326 error = xfs_trans_roll(&args->trans, dp);
1327 if (error)
1328 goto out;
1329 }
1330
1331 /*
1332 * If the result is small enough, push it all into the inode.
1333 */
1334 if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
1335 /*
1336 * Have to get rid of the copy of this dabuf in the state.
1337 */
1338 ASSERT(state->path.active == 1);
1339 ASSERT(state->path.blk[0].bp);
1340 state->path.blk[0].bp = NULL;
1341
1342 error = xfs_attr3_leaf_read(args->trans, args->dp, 0, -1, &bp);
1343 if (error)
1344 goto out;
1345
1346 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1347 xfs_bmap_init(args->flist, args->firstblock);
1348 error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
1349 /* bp is gone due to xfs_da_shrink_inode */
1350 if (!error) {
1351 error = xfs_bmap_finish(&args->trans,
1352 args->flist,
1353 &committed);
1354 }
1355 if (error) {
1356 ASSERT(committed);
1357 args->trans = NULL;
1358 xfs_bmap_cancel(args->flist);
1359 goto out;
1360 }
1361
1362 /*
1363 * bmap_finish() may have committed the last trans
1364 * and started a new one. We need the inode to be
1365 * in all transactions.
1366 */
1367 if (committed)
1368 xfs_trans_ijoin(args->trans, dp, 0);
1369 } else
1370 xfs_trans_brelse(args->trans, bp);
1371 }
1372 error = 0;
1373
1374 out:
1375 xfs_da_state_free(state);
1376 return(error);
1377 }
1378
1379 /*
1380 * Fill in the disk block numbers in the state structure for the buffers
1381 * that are attached to the state structure.
1382 * This is done so that we can quickly reattach ourselves to those buffers
1383 * after some set of transaction commits have released these buffers.
1384 */
1385 STATIC int
1386 xfs_attr_fillstate(xfs_da_state_t *state)
1387 {
1388 xfs_da_state_path_t *path;
1389 xfs_da_state_blk_t *blk;
1390 int level;
1391
1392 trace_xfs_attr_fillstate(state->args);
1393
1394 /*
1395 * Roll down the "path" in the state structure, storing the on-disk
1396 * block number for those buffers in the "path".
1397 */
1398 path = &state->path;
1399 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1400 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1401 if (blk->bp) {
1402 blk->disk_blkno = XFS_BUF_ADDR(blk->bp);
1403 blk->bp = NULL;
1404 } else {
1405 blk->disk_blkno = 0;
1406 }
1407 }
1408
1409 /*
1410 * Roll down the "altpath" in the state structure, storing the on-disk
1411 * block number for those buffers in the "altpath".
1412 */
1413 path = &state->altpath;
1414 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1415 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1416 if (blk->bp) {
1417 blk->disk_blkno = XFS_BUF_ADDR(blk->bp);
1418 blk->bp = NULL;
1419 } else {
1420 blk->disk_blkno = 0;
1421 }
1422 }
1423
1424 return(0);
1425 }
1426
1427 /*
1428 * Reattach the buffers to the state structure based on the disk block
1429 * numbers stored in the state structure.
1430 * This is done after some set of transaction commits have released those
1431 * buffers from our grip.
1432 */
1433 STATIC int
1434 xfs_attr_refillstate(xfs_da_state_t *state)
1435 {
1436 xfs_da_state_path_t *path;
1437 xfs_da_state_blk_t *blk;
1438 int level, error;
1439
1440 trace_xfs_attr_refillstate(state->args);
1441
1442 /*
1443 * Roll down the "path" in the state structure, storing the on-disk
1444 * block number for those buffers in the "path".
1445 */
1446 path = &state->path;
1447 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1448 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1449 if (blk->disk_blkno) {
1450 error = xfs_da3_node_read(state->args->trans,
1451 state->args->dp,
1452 blk->blkno, blk->disk_blkno,
1453 &blk->bp, XFS_ATTR_FORK);
1454 if (error)
1455 return(error);
1456 } else {
1457 blk->bp = NULL;
1458 }
1459 }
1460
1461 /*
1462 * Roll down the "altpath" in the state structure, storing the on-disk
1463 * block number for those buffers in the "altpath".
1464 */
1465 path = &state->altpath;
1466 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1467 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1468 if (blk->disk_blkno) {
1469 error = xfs_da3_node_read(state->args->trans,
1470 state->args->dp,
1471 blk->blkno, blk->disk_blkno,
1472 &blk->bp, XFS_ATTR_FORK);
1473 if (error)
1474 return(error);
1475 } else {
1476 blk->bp = NULL;
1477 }
1478 }
1479
1480 return(0);
1481 }
1482
1483 /*
1484 * Look up a filename in a node attribute list.
1485 *
1486 * This routine gets called for any attribute fork that has more than one
1487 * block, ie: both true Btree attr lists and for single-leaf-blocks with
1488 * "remote" values taking up more blocks.
1489 */
1490 STATIC int
1491 xfs_attr_node_get(xfs_da_args_t *args)
1492 {
1493 xfs_da_state_t *state;
1494 xfs_da_state_blk_t *blk;
1495 int error, retval;
1496 int i;
1497
1498 trace_xfs_attr_node_get(args);
1499
1500 state = xfs_da_state_alloc();
1501 state->args = args;
1502 state->mp = args->dp->i_mount;
1503 state->blocksize = state->mp->m_sb.sb_blocksize;
1504 state->node_ents = state->mp->m_attr_node_ents;
1505
1506 /*
1507 * Search to see if name exists, and get back a pointer to it.
1508 */
1509 error = xfs_da3_node_lookup_int(state, &retval);
1510 if (error) {
1511 retval = error;
1512 } else if (retval == EEXIST) {
1513 blk = &state->path.blk[ state->path.active-1 ];
1514 ASSERT(blk->bp != NULL);
1515 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1516
1517 /*
1518 * Get the value, local or "remote"
1519 */
1520 retval = xfs_attr3_leaf_getvalue(blk->bp, args);
1521 if (!retval && (args->rmtblkno > 0)
1522 && !(args->flags & ATTR_KERNOVAL)) {
1523 retval = xfs_attr_rmtval_get(args);
1524 }
1525 }
1526
1527 /*
1528 * If not in a transaction, we have to release all the buffers.
1529 */
1530 for (i = 0; i < state->path.active; i++) {
1531 xfs_trans_brelse(args->trans, state->path.blk[i].bp);
1532 state->path.blk[i].bp = NULL;
1533 }
1534
1535 xfs_da_state_free(state);
1536 return(retval);
1537 }
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