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[mirror_ubuntu-zesty-kernel.git] / fs / xfs / libxfs / xfs_attr.c
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_shared.h"
21 #include "xfs_format.h"
22 #include "xfs_log_format.h"
23 #include "xfs_trans_resv.h"
24 #include "xfs_bit.h"
25 #include "xfs_mount.h"
26 #include "xfs_da_format.h"
27 #include "xfs_da_btree.h"
28 #include "xfs_attr_sf.h"
29 #include "xfs_inode.h"
30 #include "xfs_alloc.h"
31 #include "xfs_trans.h"
32 #include "xfs_inode_item.h"
33 #include "xfs_bmap.h"
34 #include "xfs_bmap_util.h"
35 #include "xfs_bmap_btree.h"
36 #include "xfs_attr.h"
37 #include "xfs_attr_leaf.h"
38 #include "xfs_attr_remote.h"
39 #include "xfs_error.h"
40 #include "xfs_quota.h"
41 #include "xfs_trans_space.h"
42 #include "xfs_trace.h"
43
44 /*
45 * xfs_attr.c
46 *
47 * Provide the external interfaces to manage attribute lists.
48 */
49
50 /*========================================================================
51 * Function prototypes for the kernel.
52 *========================================================================*/
53
54 /*
55 * Internal routines when attribute list fits inside the inode.
56 */
57 STATIC int xfs_attr_shortform_addname(xfs_da_args_t *args);
58
59 /*
60 * Internal routines when attribute list is one block.
61 */
62 STATIC int xfs_attr_leaf_get(xfs_da_args_t *args);
63 STATIC int xfs_attr_leaf_addname(xfs_da_args_t *args);
64 STATIC int xfs_attr_leaf_removename(xfs_da_args_t *args);
65
66 /*
67 * Internal routines when attribute list is more than one block.
68 */
69 STATIC int xfs_attr_node_get(xfs_da_args_t *args);
70 STATIC int xfs_attr_node_addname(xfs_da_args_t *args);
71 STATIC int xfs_attr_node_removename(xfs_da_args_t *args);
72 STATIC int xfs_attr_fillstate(xfs_da_state_t *state);
73 STATIC int xfs_attr_refillstate(xfs_da_state_t *state);
74
75
76 STATIC int
77 xfs_attr_args_init(
78 struct xfs_da_args *args,
79 struct xfs_inode *dp,
80 const unsigned char *name,
81 int flags)
82 {
83
84 if (!name)
85 return -EINVAL;
86
87 memset(args, 0, sizeof(*args));
88 args->geo = dp->i_mount->m_attr_geo;
89 args->whichfork = XFS_ATTR_FORK;
90 args->dp = dp;
91 args->flags = flags;
92 args->name = name;
93 args->namelen = strlen((const char *)name);
94 if (args->namelen >= MAXNAMELEN)
95 return -EFAULT; /* match IRIX behaviour */
96
97 args->hashval = xfs_da_hashname(args->name, args->namelen);
98 return 0;
99 }
100
101 int
102 xfs_inode_hasattr(
103 struct xfs_inode *ip)
104 {
105 if (!XFS_IFORK_Q(ip) ||
106 (ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
107 ip->i_d.di_anextents == 0))
108 return 0;
109 return 1;
110 }
111
112 /*========================================================================
113 * Overall external interface routines.
114 *========================================================================*/
115
116 int
117 xfs_attr_get(
118 struct xfs_inode *ip,
119 const unsigned char *name,
120 unsigned char *value,
121 int *valuelenp,
122 int flags)
123 {
124 struct xfs_da_args args;
125 uint lock_mode;
126 int error;
127
128 XFS_STATS_INC(ip->i_mount, xs_attr_get);
129
130 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
131 return -EIO;
132
133 if (!xfs_inode_hasattr(ip))
134 return -ENOATTR;
135
136 error = xfs_attr_args_init(&args, ip, name, flags);
137 if (error)
138 return error;
139
140 args.value = value;
141 args.valuelen = *valuelenp;
142 /* Entirely possible to look up a name which doesn't exist */
143 args.op_flags = XFS_DA_OP_OKNOENT;
144
145 lock_mode = xfs_ilock_attr_map_shared(ip);
146 if (!xfs_inode_hasattr(ip))
147 error = -ENOATTR;
148 else if (ip->i_d.di_aformat == XFS_DINODE_FMT_LOCAL)
149 error = xfs_attr_shortform_getvalue(&args);
150 else if (xfs_bmap_one_block(ip, XFS_ATTR_FORK))
151 error = xfs_attr_leaf_get(&args);
152 else
153 error = xfs_attr_node_get(&args);
154 xfs_iunlock(ip, lock_mode);
155
156 *valuelenp = args.valuelen;
157 return error == -EEXIST ? 0 : error;
158 }
159
160 /*
161 * Calculate how many blocks we need for the new attribute,
162 */
163 STATIC int
164 xfs_attr_calc_size(
165 struct xfs_da_args *args,
166 int *local)
167 {
168 struct xfs_mount *mp = args->dp->i_mount;
169 int size;
170 int nblks;
171
172 /*
173 * Determine space new attribute will use, and if it would be
174 * "local" or "remote" (note: local != inline).
175 */
176 size = xfs_attr_leaf_newentsize(args, local);
177 nblks = XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK);
178 if (*local) {
179 if (size > (args->geo->blksize / 2)) {
180 /* Double split possible */
181 nblks *= 2;
182 }
183 } else {
184 /*
185 * Out of line attribute, cannot double split, but
186 * make room for the attribute value itself.
187 */
188 uint dblocks = xfs_attr3_rmt_blocks(mp, args->valuelen);
189 nblks += dblocks;
190 nblks += XFS_NEXTENTADD_SPACE_RES(mp, dblocks, XFS_ATTR_FORK);
191 }
192
193 return nblks;
194 }
195
196 int
197 xfs_attr_set(
198 struct xfs_inode *dp,
199 const unsigned char *name,
200 unsigned char *value,
201 int valuelen,
202 int flags)
203 {
204 struct xfs_mount *mp = dp->i_mount;
205 struct xfs_da_args args;
206 struct xfs_bmap_free flist;
207 struct xfs_trans_res tres;
208 xfs_fsblock_t firstblock;
209 int rsvd = (flags & ATTR_ROOT) != 0;
210 int error, err2, committed, local;
211
212 XFS_STATS_INC(mp, xs_attr_set);
213
214 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
215 return -EIO;
216
217 error = xfs_attr_args_init(&args, dp, name, flags);
218 if (error)
219 return error;
220
221 args.value = value;
222 args.valuelen = valuelen;
223 args.firstblock = &firstblock;
224 args.flist = &flist;
225 args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
226 args.total = xfs_attr_calc_size(&args, &local);
227
228 error = xfs_qm_dqattach(dp, 0);
229 if (error)
230 return error;
231
232 /*
233 * If the inode doesn't have an attribute fork, add one.
234 * (inode must not be locked when we call this routine)
235 */
236 if (XFS_IFORK_Q(dp) == 0) {
237 int sf_size = sizeof(xfs_attr_sf_hdr_t) +
238 XFS_ATTR_SF_ENTSIZE_BYNAME(args.namelen, valuelen);
239
240 error = xfs_bmap_add_attrfork(dp, sf_size, rsvd);
241 if (error)
242 return error;
243 }
244
245 /*
246 * Start our first transaction of the day.
247 *
248 * All future transactions during this code must be "chained" off
249 * this one via the trans_dup() call. All transactions will contain
250 * the inode, and the inode will always be marked with trans_ihold().
251 * Since the inode will be locked in all transactions, we must log
252 * the inode in every transaction to let it float upward through
253 * the log.
254 */
255 args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_SET);
256
257 /*
258 * Root fork attributes can use reserved data blocks for this
259 * operation if necessary
260 */
261
262 if (rsvd)
263 args.trans->t_flags |= XFS_TRANS_RESERVE;
264
265 tres.tr_logres = M_RES(mp)->tr_attrsetm.tr_logres +
266 M_RES(mp)->tr_attrsetrt.tr_logres * args.total;
267 tres.tr_logcount = XFS_ATTRSET_LOG_COUNT;
268 tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
269 error = xfs_trans_reserve(args.trans, &tres, args.total, 0);
270 if (error) {
271 xfs_trans_cancel(args.trans);
272 return error;
273 }
274 xfs_ilock(dp, XFS_ILOCK_EXCL);
275
276 error = xfs_trans_reserve_quota_nblks(args.trans, dp, args.total, 0,
277 rsvd ? XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
278 XFS_QMOPT_RES_REGBLKS);
279 if (error) {
280 xfs_iunlock(dp, XFS_ILOCK_EXCL);
281 xfs_trans_cancel(args.trans);
282 return error;
283 }
284
285 xfs_trans_ijoin(args.trans, dp, 0);
286
287 /*
288 * If the attribute list is non-existent or a shortform list,
289 * upgrade it to a single-leaf-block attribute list.
290 */
291 if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL ||
292 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
293 dp->i_d.di_anextents == 0)) {
294
295 /*
296 * Build initial attribute list (if required).
297 */
298 if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS)
299 xfs_attr_shortform_create(&args);
300
301 /*
302 * Try to add the attr to the attribute list in
303 * the inode.
304 */
305 error = xfs_attr_shortform_addname(&args);
306 if (error != -ENOSPC) {
307 /*
308 * Commit the shortform mods, and we're done.
309 * NOTE: this is also the error path (EEXIST, etc).
310 */
311 ASSERT(args.trans != NULL);
312
313 /*
314 * If this is a synchronous mount, make sure that
315 * the transaction goes to disk before returning
316 * to the user.
317 */
318 if (mp->m_flags & XFS_MOUNT_WSYNC)
319 xfs_trans_set_sync(args.trans);
320
321 if (!error && (flags & ATTR_KERNOTIME) == 0) {
322 xfs_trans_ichgtime(args.trans, dp,
323 XFS_ICHGTIME_CHG);
324 }
325 err2 = xfs_trans_commit(args.trans);
326 xfs_iunlock(dp, XFS_ILOCK_EXCL);
327
328 return error ? error : err2;
329 }
330
331 /*
332 * It won't fit in the shortform, transform to a leaf block.
333 * GROT: another possible req'mt for a double-split btree op.
334 */
335 xfs_bmap_init(args.flist, args.firstblock);
336 error = xfs_attr_shortform_to_leaf(&args);
337 if (!error) {
338 error = xfs_bmap_finish(&args.trans, args.flist,
339 &committed);
340 }
341 if (error) {
342 ASSERT(committed);
343 args.trans = NULL;
344 xfs_bmap_cancel(&flist);
345 goto out;
346 }
347
348 /*
349 * bmap_finish() may have committed the last trans and started
350 * a new one. We need the inode to be in all transactions.
351 */
352 if (committed)
353 xfs_trans_ijoin(args.trans, dp, 0);
354
355 /*
356 * Commit the leaf transformation. We'll need another (linked)
357 * transaction to add the new attribute to the leaf.
358 */
359
360 error = xfs_trans_roll(&args.trans, dp);
361 if (error)
362 goto out;
363
364 }
365
366 if (xfs_bmap_one_block(dp, XFS_ATTR_FORK))
367 error = xfs_attr_leaf_addname(&args);
368 else
369 error = xfs_attr_node_addname(&args);
370 if (error)
371 goto out;
372
373 /*
374 * If this is a synchronous mount, make sure that the
375 * transaction goes to disk before returning to the user.
376 */
377 if (mp->m_flags & XFS_MOUNT_WSYNC)
378 xfs_trans_set_sync(args.trans);
379
380 if ((flags & ATTR_KERNOTIME) == 0)
381 xfs_trans_ichgtime(args.trans, dp, XFS_ICHGTIME_CHG);
382
383 /*
384 * Commit the last in the sequence of transactions.
385 */
386 xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
387 error = xfs_trans_commit(args.trans);
388 xfs_iunlock(dp, XFS_ILOCK_EXCL);
389
390 return error;
391
392 out:
393 if (args.trans)
394 xfs_trans_cancel(args.trans);
395 xfs_iunlock(dp, XFS_ILOCK_EXCL);
396 return error;
397 }
398
399 /*
400 * Generic handler routine to remove a name from an attribute list.
401 * Transitions attribute list from Btree to shortform as necessary.
402 */
403 int
404 xfs_attr_remove(
405 struct xfs_inode *dp,
406 const unsigned char *name,
407 int flags)
408 {
409 struct xfs_mount *mp = dp->i_mount;
410 struct xfs_da_args args;
411 struct xfs_bmap_free flist;
412 xfs_fsblock_t firstblock;
413 int error;
414
415 XFS_STATS_INC(mp, xs_attr_remove);
416
417 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
418 return -EIO;
419
420 if (!xfs_inode_hasattr(dp))
421 return -ENOATTR;
422
423 error = xfs_attr_args_init(&args, dp, name, flags);
424 if (error)
425 return error;
426
427 args.firstblock = &firstblock;
428 args.flist = &flist;
429
430 /*
431 * we have no control over the attribute names that userspace passes us
432 * to remove, so we have to allow the name lookup prior to attribute
433 * removal to fail.
434 */
435 args.op_flags = XFS_DA_OP_OKNOENT;
436
437 error = xfs_qm_dqattach(dp, 0);
438 if (error)
439 return error;
440
441 /*
442 * Start our first transaction of the day.
443 *
444 * All future transactions during this code must be "chained" off
445 * this one via the trans_dup() call. All transactions will contain
446 * the inode, and the inode will always be marked with trans_ihold().
447 * Since the inode will be locked in all transactions, we must log
448 * the inode in every transaction to let it float upward through
449 * the log.
450 */
451 args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_RM);
452
453 /*
454 * Root fork attributes can use reserved data blocks for this
455 * operation if necessary
456 */
457
458 if (flags & ATTR_ROOT)
459 args.trans->t_flags |= XFS_TRANS_RESERVE;
460
461 error = xfs_trans_reserve(args.trans, &M_RES(mp)->tr_attrrm,
462 XFS_ATTRRM_SPACE_RES(mp), 0);
463 if (error) {
464 xfs_trans_cancel(args.trans);
465 return error;
466 }
467
468 xfs_ilock(dp, XFS_ILOCK_EXCL);
469 /*
470 * No need to make quota reservations here. We expect to release some
471 * blocks not allocate in the common case.
472 */
473 xfs_trans_ijoin(args.trans, dp, 0);
474
475 if (!xfs_inode_hasattr(dp)) {
476 error = -ENOATTR;
477 } else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
478 ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
479 error = xfs_attr_shortform_remove(&args);
480 } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
481 error = xfs_attr_leaf_removename(&args);
482 } else {
483 error = xfs_attr_node_removename(&args);
484 }
485
486 if (error)
487 goto out;
488
489 /*
490 * If this is a synchronous mount, make sure that the
491 * transaction goes to disk before returning to the user.
492 */
493 if (mp->m_flags & XFS_MOUNT_WSYNC)
494 xfs_trans_set_sync(args.trans);
495
496 if ((flags & ATTR_KERNOTIME) == 0)
497 xfs_trans_ichgtime(args.trans, dp, XFS_ICHGTIME_CHG);
498
499 /*
500 * Commit the last in the sequence of transactions.
501 */
502 xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
503 error = xfs_trans_commit(args.trans);
504 xfs_iunlock(dp, XFS_ILOCK_EXCL);
505
506 return error;
507
508 out:
509 if (args.trans)
510 xfs_trans_cancel(args.trans);
511 xfs_iunlock(dp, XFS_ILOCK_EXCL);
512 return error;
513 }
514
515 /*========================================================================
516 * External routines when attribute list is inside the inode
517 *========================================================================*/
518
519 /*
520 * Add a name to the shortform attribute list structure
521 * This is the external routine.
522 */
523 STATIC int
524 xfs_attr_shortform_addname(xfs_da_args_t *args)
525 {
526 int newsize, forkoff, retval;
527
528 trace_xfs_attr_sf_addname(args);
529
530 retval = xfs_attr_shortform_lookup(args);
531 if ((args->flags & ATTR_REPLACE) && (retval == -ENOATTR)) {
532 return retval;
533 } else if (retval == -EEXIST) {
534 if (args->flags & ATTR_CREATE)
535 return retval;
536 retval = xfs_attr_shortform_remove(args);
537 ASSERT(retval == 0);
538 }
539
540 if (args->namelen >= XFS_ATTR_SF_ENTSIZE_MAX ||
541 args->valuelen >= XFS_ATTR_SF_ENTSIZE_MAX)
542 return -ENOSPC;
543
544 newsize = XFS_ATTR_SF_TOTSIZE(args->dp);
545 newsize += XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
546
547 forkoff = xfs_attr_shortform_bytesfit(args->dp, newsize);
548 if (!forkoff)
549 return -ENOSPC;
550
551 xfs_attr_shortform_add(args, forkoff);
552 return 0;
553 }
554
555
556 /*========================================================================
557 * External routines when attribute list is one block
558 *========================================================================*/
559
560 /*
561 * Add a name to the leaf attribute list structure
562 *
563 * This leaf block cannot have a "remote" value, we only call this routine
564 * if bmap_one_block() says there is only one block (ie: no remote blks).
565 */
566 STATIC int
567 xfs_attr_leaf_addname(xfs_da_args_t *args)
568 {
569 xfs_inode_t *dp;
570 struct xfs_buf *bp;
571 int retval, error, committed, forkoff;
572
573 trace_xfs_attr_leaf_addname(args);
574
575 /*
576 * Read the (only) block in the attribute list in.
577 */
578 dp = args->dp;
579 args->blkno = 0;
580 error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, -1, &bp);
581 if (error)
582 return error;
583
584 /*
585 * Look up the given attribute in the leaf block. Figure out if
586 * the given flags produce an error or call for an atomic rename.
587 */
588 retval = xfs_attr3_leaf_lookup_int(bp, args);
589 if ((args->flags & ATTR_REPLACE) && (retval == -ENOATTR)) {
590 xfs_trans_brelse(args->trans, bp);
591 return retval;
592 } else if (retval == -EEXIST) {
593 if (args->flags & ATTR_CREATE) { /* pure create op */
594 xfs_trans_brelse(args->trans, bp);
595 return retval;
596 }
597
598 trace_xfs_attr_leaf_replace(args);
599
600 /* save the attribute state for later removal*/
601 args->op_flags |= XFS_DA_OP_RENAME; /* an atomic rename */
602 args->blkno2 = args->blkno; /* set 2nd entry info*/
603 args->index2 = args->index;
604 args->rmtblkno2 = args->rmtblkno;
605 args->rmtblkcnt2 = args->rmtblkcnt;
606 args->rmtvaluelen2 = args->rmtvaluelen;
607
608 /*
609 * clear the remote attr state now that it is saved so that the
610 * values reflect the state of the attribute we are about to
611 * add, not the attribute we just found and will remove later.
612 */
613 args->rmtblkno = 0;
614 args->rmtblkcnt = 0;
615 args->rmtvaluelen = 0;
616 }
617
618 /*
619 * Add the attribute to the leaf block, transitioning to a Btree
620 * if required.
621 */
622 retval = xfs_attr3_leaf_add(bp, args);
623 if (retval == -ENOSPC) {
624 /*
625 * Promote the attribute list to the Btree format, then
626 * Commit that transaction so that the node_addname() call
627 * can manage its own transactions.
628 */
629 xfs_bmap_init(args->flist, args->firstblock);
630 error = xfs_attr3_leaf_to_node(args);
631 if (!error) {
632 error = xfs_bmap_finish(&args->trans, args->flist,
633 &committed);
634 }
635 if (error) {
636 ASSERT(committed);
637 args->trans = NULL;
638 xfs_bmap_cancel(args->flist);
639 return error;
640 }
641
642 /*
643 * bmap_finish() may have committed the last trans and started
644 * a new one. We need the inode to be in all transactions.
645 */
646 if (committed)
647 xfs_trans_ijoin(args->trans, dp, 0);
648
649 /*
650 * Commit the current trans (including the inode) and start
651 * a new one.
652 */
653 error = xfs_trans_roll(&args->trans, dp);
654 if (error)
655 return error;
656
657 /*
658 * Fob the whole rest of the problem off on the Btree code.
659 */
660 error = xfs_attr_node_addname(args);
661 return error;
662 }
663
664 /*
665 * Commit the transaction that added the attr name so that
666 * later routines can manage their own transactions.
667 */
668 error = xfs_trans_roll(&args->trans, dp);
669 if (error)
670 return error;
671
672 /*
673 * If there was an out-of-line value, allocate the blocks we
674 * identified for its storage and copy the value. This is done
675 * after we create the attribute so that we don't overflow the
676 * maximum size of a transaction and/or hit a deadlock.
677 */
678 if (args->rmtblkno > 0) {
679 error = xfs_attr_rmtval_set(args);
680 if (error)
681 return error;
682 }
683
684 /*
685 * If this is an atomic rename operation, we must "flip" the
686 * incomplete flags on the "new" and "old" attribute/value pairs
687 * so that one disappears and one appears atomically. Then we
688 * must remove the "old" attribute/value pair.
689 */
690 if (args->op_flags & XFS_DA_OP_RENAME) {
691 /*
692 * In a separate transaction, set the incomplete flag on the
693 * "old" attr and clear the incomplete flag on the "new" attr.
694 */
695 error = xfs_attr3_leaf_flipflags(args);
696 if (error)
697 return error;
698
699 /*
700 * Dismantle the "old" attribute/value pair by removing
701 * a "remote" value (if it exists).
702 */
703 args->index = args->index2;
704 args->blkno = args->blkno2;
705 args->rmtblkno = args->rmtblkno2;
706 args->rmtblkcnt = args->rmtblkcnt2;
707 args->rmtvaluelen = args->rmtvaluelen2;
708 if (args->rmtblkno) {
709 error = xfs_attr_rmtval_remove(args);
710 if (error)
711 return error;
712 }
713
714 /*
715 * Read in the block containing the "old" attr, then
716 * remove the "old" attr from that block (neat, huh!)
717 */
718 error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno,
719 -1, &bp);
720 if (error)
721 return error;
722
723 xfs_attr3_leaf_remove(bp, args);
724
725 /*
726 * If the result is small enough, shrink it all into the inode.
727 */
728 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
729 xfs_bmap_init(args->flist, args->firstblock);
730 error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
731 /* bp is gone due to xfs_da_shrink_inode */
732 if (!error) {
733 error = xfs_bmap_finish(&args->trans,
734 args->flist,
735 &committed);
736 }
737 if (error) {
738 ASSERT(committed);
739 args->trans = NULL;
740 xfs_bmap_cancel(args->flist);
741 return error;
742 }
743
744 /*
745 * bmap_finish() may have committed the last trans
746 * and started a new one. We need the inode to be
747 * in all transactions.
748 */
749 if (committed)
750 xfs_trans_ijoin(args->trans, dp, 0);
751 }
752
753 /*
754 * Commit the remove and start the next trans in series.
755 */
756 error = xfs_trans_roll(&args->trans, dp);
757
758 } else if (args->rmtblkno > 0) {
759 /*
760 * Added a "remote" value, just clear the incomplete flag.
761 */
762 error = xfs_attr3_leaf_clearflag(args);
763 }
764 return error;
765 }
766
767 /*
768 * Remove a name from the leaf attribute list structure
769 *
770 * This leaf block cannot have a "remote" value, we only call this routine
771 * if bmap_one_block() says there is only one block (ie: no remote blks).
772 */
773 STATIC int
774 xfs_attr_leaf_removename(xfs_da_args_t *args)
775 {
776 xfs_inode_t *dp;
777 struct xfs_buf *bp;
778 int error, committed, forkoff;
779
780 trace_xfs_attr_leaf_removename(args);
781
782 /*
783 * Remove the attribute.
784 */
785 dp = args->dp;
786 args->blkno = 0;
787 error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, -1, &bp);
788 if (error)
789 return error;
790
791 error = xfs_attr3_leaf_lookup_int(bp, args);
792 if (error == -ENOATTR) {
793 xfs_trans_brelse(args->trans, bp);
794 return error;
795 }
796
797 xfs_attr3_leaf_remove(bp, args);
798
799 /*
800 * If the result is small enough, shrink it all into the inode.
801 */
802 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
803 xfs_bmap_init(args->flist, args->firstblock);
804 error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
805 /* bp is gone due to xfs_da_shrink_inode */
806 if (!error) {
807 error = xfs_bmap_finish(&args->trans, args->flist,
808 &committed);
809 }
810 if (error) {
811 ASSERT(committed);
812 args->trans = NULL;
813 xfs_bmap_cancel(args->flist);
814 return error;
815 }
816
817 /*
818 * bmap_finish() may have committed the last trans and started
819 * a new one. We need the inode to be in all transactions.
820 */
821 if (committed)
822 xfs_trans_ijoin(args->trans, dp, 0);
823 }
824 return 0;
825 }
826
827 /*
828 * Look up a name in a leaf attribute list structure.
829 *
830 * This leaf block cannot have a "remote" value, we only call this routine
831 * if bmap_one_block() says there is only one block (ie: no remote blks).
832 */
833 STATIC int
834 xfs_attr_leaf_get(xfs_da_args_t *args)
835 {
836 struct xfs_buf *bp;
837 int error;
838
839 trace_xfs_attr_leaf_get(args);
840
841 args->blkno = 0;
842 error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, -1, &bp);
843 if (error)
844 return error;
845
846 error = xfs_attr3_leaf_lookup_int(bp, args);
847 if (error != -EEXIST) {
848 xfs_trans_brelse(args->trans, bp);
849 return error;
850 }
851 error = xfs_attr3_leaf_getvalue(bp, args);
852 xfs_trans_brelse(args->trans, bp);
853 if (!error && (args->rmtblkno > 0) && !(args->flags & ATTR_KERNOVAL)) {
854 error = xfs_attr_rmtval_get(args);
855 }
856 return error;
857 }
858
859 /*========================================================================
860 * External routines when attribute list size > geo->blksize
861 *========================================================================*/
862
863 /*
864 * Add a name to a Btree-format attribute list.
865 *
866 * This will involve walking down the Btree, and may involve splitting
867 * leaf nodes and even splitting intermediate nodes up to and including
868 * the root node (a special case of an intermediate node).
869 *
870 * "Remote" attribute values confuse the issue and atomic rename operations
871 * add a whole extra layer of confusion on top of that.
872 */
873 STATIC int
874 xfs_attr_node_addname(xfs_da_args_t *args)
875 {
876 xfs_da_state_t *state;
877 xfs_da_state_blk_t *blk;
878 xfs_inode_t *dp;
879 xfs_mount_t *mp;
880 int committed, retval, error;
881
882 trace_xfs_attr_node_addname(args);
883
884 /*
885 * Fill in bucket of arguments/results/context to carry around.
886 */
887 dp = args->dp;
888 mp = dp->i_mount;
889 restart:
890 state = xfs_da_state_alloc();
891 state->args = args;
892 state->mp = mp;
893
894 /*
895 * Search to see if name already exists, and get back a pointer
896 * to where it should go.
897 */
898 error = xfs_da3_node_lookup_int(state, &retval);
899 if (error)
900 goto out;
901 blk = &state->path.blk[ state->path.active-1 ];
902 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
903 if ((args->flags & ATTR_REPLACE) && (retval == -ENOATTR)) {
904 goto out;
905 } else if (retval == -EEXIST) {
906 if (args->flags & ATTR_CREATE)
907 goto out;
908
909 trace_xfs_attr_node_replace(args);
910
911 /* save the attribute state for later removal*/
912 args->op_flags |= XFS_DA_OP_RENAME; /* atomic rename op */
913 args->blkno2 = args->blkno; /* set 2nd entry info*/
914 args->index2 = args->index;
915 args->rmtblkno2 = args->rmtblkno;
916 args->rmtblkcnt2 = args->rmtblkcnt;
917 args->rmtvaluelen2 = args->rmtvaluelen;
918
919 /*
920 * clear the remote attr state now that it is saved so that the
921 * values reflect the state of the attribute we are about to
922 * add, not the attribute we just found and will remove later.
923 */
924 args->rmtblkno = 0;
925 args->rmtblkcnt = 0;
926 args->rmtvaluelen = 0;
927 }
928
929 retval = xfs_attr3_leaf_add(blk->bp, state->args);
930 if (retval == -ENOSPC) {
931 if (state->path.active == 1) {
932 /*
933 * Its really a single leaf node, but it had
934 * out-of-line values so it looked like it *might*
935 * have been a b-tree.
936 */
937 xfs_da_state_free(state);
938 state = NULL;
939 xfs_bmap_init(args->flist, args->firstblock);
940 error = xfs_attr3_leaf_to_node(args);
941 if (!error) {
942 error = xfs_bmap_finish(&args->trans,
943 args->flist,
944 &committed);
945 }
946 if (error) {
947 ASSERT(committed);
948 args->trans = NULL;
949 xfs_bmap_cancel(args->flist);
950 goto out;
951 }
952
953 /*
954 * bmap_finish() may have committed the last trans
955 * and started a new one. We need the inode to be
956 * in all transactions.
957 */
958 if (committed)
959 xfs_trans_ijoin(args->trans, dp, 0);
960
961 /*
962 * Commit the node conversion and start the next
963 * trans in the chain.
964 */
965 error = xfs_trans_roll(&args->trans, dp);
966 if (error)
967 goto out;
968
969 goto restart;
970 }
971
972 /*
973 * Split as many Btree elements as required.
974 * This code tracks the new and old attr's location
975 * in the index/blkno/rmtblkno/rmtblkcnt fields and
976 * in the index2/blkno2/rmtblkno2/rmtblkcnt2 fields.
977 */
978 xfs_bmap_init(args->flist, args->firstblock);
979 error = xfs_da3_split(state);
980 if (!error) {
981 error = xfs_bmap_finish(&args->trans, args->flist,
982 &committed);
983 }
984 if (error) {
985 ASSERT(committed);
986 args->trans = NULL;
987 xfs_bmap_cancel(args->flist);
988 goto out;
989 }
990
991 /*
992 * bmap_finish() may have committed the last trans and started
993 * a new one. We need the inode to be in all transactions.
994 */
995 if (committed)
996 xfs_trans_ijoin(args->trans, dp, 0);
997 } else {
998 /*
999 * Addition succeeded, update Btree hashvals.
1000 */
1001 xfs_da3_fixhashpath(state, &state->path);
1002 }
1003
1004 /*
1005 * Kill the state structure, we're done with it and need to
1006 * allow the buffers to come back later.
1007 */
1008 xfs_da_state_free(state);
1009 state = NULL;
1010
1011 /*
1012 * Commit the leaf addition or btree split and start the next
1013 * trans in the chain.
1014 */
1015 error = xfs_trans_roll(&args->trans, dp);
1016 if (error)
1017 goto out;
1018
1019 /*
1020 * If there was an out-of-line value, allocate the blocks we
1021 * identified for its storage and copy the value. This is done
1022 * after we create the attribute so that we don't overflow the
1023 * maximum size of a transaction and/or hit a deadlock.
1024 */
1025 if (args->rmtblkno > 0) {
1026 error = xfs_attr_rmtval_set(args);
1027 if (error)
1028 return error;
1029 }
1030
1031 /*
1032 * If this is an atomic rename operation, we must "flip" the
1033 * incomplete flags on the "new" and "old" attribute/value pairs
1034 * so that one disappears and one appears atomically. Then we
1035 * must remove the "old" attribute/value pair.
1036 */
1037 if (args->op_flags & XFS_DA_OP_RENAME) {
1038 /*
1039 * In a separate transaction, set the incomplete flag on the
1040 * "old" attr and clear the incomplete flag on the "new" attr.
1041 */
1042 error = xfs_attr3_leaf_flipflags(args);
1043 if (error)
1044 goto out;
1045
1046 /*
1047 * Dismantle the "old" attribute/value pair by removing
1048 * a "remote" value (if it exists).
1049 */
1050 args->index = args->index2;
1051 args->blkno = args->blkno2;
1052 args->rmtblkno = args->rmtblkno2;
1053 args->rmtblkcnt = args->rmtblkcnt2;
1054 args->rmtvaluelen = args->rmtvaluelen2;
1055 if (args->rmtblkno) {
1056 error = xfs_attr_rmtval_remove(args);
1057 if (error)
1058 return error;
1059 }
1060
1061 /*
1062 * Re-find the "old" attribute entry after any split ops.
1063 * The INCOMPLETE flag means that we will find the "old"
1064 * attr, not the "new" one.
1065 */
1066 args->flags |= XFS_ATTR_INCOMPLETE;
1067 state = xfs_da_state_alloc();
1068 state->args = args;
1069 state->mp = mp;
1070 state->inleaf = 0;
1071 error = xfs_da3_node_lookup_int(state, &retval);
1072 if (error)
1073 goto out;
1074
1075 /*
1076 * Remove the name and update the hashvals in the tree.
1077 */
1078 blk = &state->path.blk[ state->path.active-1 ];
1079 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1080 error = xfs_attr3_leaf_remove(blk->bp, args);
1081 xfs_da3_fixhashpath(state, &state->path);
1082
1083 /*
1084 * Check to see if the tree needs to be collapsed.
1085 */
1086 if (retval && (state->path.active > 1)) {
1087 xfs_bmap_init(args->flist, args->firstblock);
1088 error = xfs_da3_join(state);
1089 if (!error) {
1090 error = xfs_bmap_finish(&args->trans,
1091 args->flist,
1092 &committed);
1093 }
1094 if (error) {
1095 ASSERT(committed);
1096 args->trans = NULL;
1097 xfs_bmap_cancel(args->flist);
1098 goto out;
1099 }
1100
1101 /*
1102 * bmap_finish() may have committed the last trans
1103 * and started a new one. We need the inode to be
1104 * in all transactions.
1105 */
1106 if (committed)
1107 xfs_trans_ijoin(args->trans, dp, 0);
1108 }
1109
1110 /*
1111 * Commit and start the next trans in the chain.
1112 */
1113 error = xfs_trans_roll(&args->trans, dp);
1114 if (error)
1115 goto out;
1116
1117 } else if (args->rmtblkno > 0) {
1118 /*
1119 * Added a "remote" value, just clear the incomplete flag.
1120 */
1121 error = xfs_attr3_leaf_clearflag(args);
1122 if (error)
1123 goto out;
1124 }
1125 retval = error = 0;
1126
1127 out:
1128 if (state)
1129 xfs_da_state_free(state);
1130 if (error)
1131 return error;
1132 return retval;
1133 }
1134
1135 /*
1136 * Remove a name from a B-tree attribute list.
1137 *
1138 * This will involve walking down the Btree, and may involve joining
1139 * leaf nodes and even joining intermediate nodes up to and including
1140 * the root node (a special case of an intermediate node).
1141 */
1142 STATIC int
1143 xfs_attr_node_removename(xfs_da_args_t *args)
1144 {
1145 xfs_da_state_t *state;
1146 xfs_da_state_blk_t *blk;
1147 xfs_inode_t *dp;
1148 struct xfs_buf *bp;
1149 int retval, error, committed, forkoff;
1150
1151 trace_xfs_attr_node_removename(args);
1152
1153 /*
1154 * Tie a string around our finger to remind us where we are.
1155 */
1156 dp = args->dp;
1157 state = xfs_da_state_alloc();
1158 state->args = args;
1159 state->mp = dp->i_mount;
1160
1161 /*
1162 * Search to see if name exists, and get back a pointer to it.
1163 */
1164 error = xfs_da3_node_lookup_int(state, &retval);
1165 if (error || (retval != -EEXIST)) {
1166 if (error == 0)
1167 error = retval;
1168 goto out;
1169 }
1170
1171 /*
1172 * If there is an out-of-line value, de-allocate the blocks.
1173 * This is done before we remove the attribute so that we don't
1174 * overflow the maximum size of a transaction and/or hit a deadlock.
1175 */
1176 blk = &state->path.blk[ state->path.active-1 ];
1177 ASSERT(blk->bp != NULL);
1178 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1179 if (args->rmtblkno > 0) {
1180 /*
1181 * Fill in disk block numbers in the state structure
1182 * so that we can get the buffers back after we commit
1183 * several transactions in the following calls.
1184 */
1185 error = xfs_attr_fillstate(state);
1186 if (error)
1187 goto out;
1188
1189 /*
1190 * Mark the attribute as INCOMPLETE, then bunmapi() the
1191 * remote value.
1192 */
1193 error = xfs_attr3_leaf_setflag(args);
1194 if (error)
1195 goto out;
1196 error = xfs_attr_rmtval_remove(args);
1197 if (error)
1198 goto out;
1199
1200 /*
1201 * Refill the state structure with buffers, the prior calls
1202 * released our buffers.
1203 */
1204 error = xfs_attr_refillstate(state);
1205 if (error)
1206 goto out;
1207 }
1208
1209 /*
1210 * Remove the name and update the hashvals in the tree.
1211 */
1212 blk = &state->path.blk[ state->path.active-1 ];
1213 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1214 retval = xfs_attr3_leaf_remove(blk->bp, args);
1215 xfs_da3_fixhashpath(state, &state->path);
1216
1217 /*
1218 * Check to see if the tree needs to be collapsed.
1219 */
1220 if (retval && (state->path.active > 1)) {
1221 xfs_bmap_init(args->flist, args->firstblock);
1222 error = xfs_da3_join(state);
1223 if (!error) {
1224 error = xfs_bmap_finish(&args->trans, args->flist,
1225 &committed);
1226 }
1227 if (error) {
1228 ASSERT(committed);
1229 args->trans = NULL;
1230 xfs_bmap_cancel(args->flist);
1231 goto out;
1232 }
1233
1234 /*
1235 * bmap_finish() may have committed the last trans and started
1236 * a new one. We need the inode to be in all transactions.
1237 */
1238 if (committed)
1239 xfs_trans_ijoin(args->trans, dp, 0);
1240
1241 /*
1242 * Commit the Btree join operation and start a new trans.
1243 */
1244 error = xfs_trans_roll(&args->trans, dp);
1245 if (error)
1246 goto out;
1247 }
1248
1249 /*
1250 * If the result is small enough, push it all into the inode.
1251 */
1252 if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
1253 /*
1254 * Have to get rid of the copy of this dabuf in the state.
1255 */
1256 ASSERT(state->path.active == 1);
1257 ASSERT(state->path.blk[0].bp);
1258 state->path.blk[0].bp = NULL;
1259
1260 error = xfs_attr3_leaf_read(args->trans, args->dp, 0, -1, &bp);
1261 if (error)
1262 goto out;
1263
1264 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1265 xfs_bmap_init(args->flist, args->firstblock);
1266 error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
1267 /* bp is gone due to xfs_da_shrink_inode */
1268 if (!error) {
1269 error = xfs_bmap_finish(&args->trans,
1270 args->flist,
1271 &committed);
1272 }
1273 if (error) {
1274 ASSERT(committed);
1275 args->trans = NULL;
1276 xfs_bmap_cancel(args->flist);
1277 goto out;
1278 }
1279
1280 /*
1281 * bmap_finish() may have committed the last trans
1282 * and started a new one. We need the inode to be
1283 * in all transactions.
1284 */
1285 if (committed)
1286 xfs_trans_ijoin(args->trans, dp, 0);
1287 } else
1288 xfs_trans_brelse(args->trans, bp);
1289 }
1290 error = 0;
1291
1292 out:
1293 xfs_da_state_free(state);
1294 return error;
1295 }
1296
1297 /*
1298 * Fill in the disk block numbers in the state structure for the buffers
1299 * that are attached to the state structure.
1300 * This is done so that we can quickly reattach ourselves to those buffers
1301 * after some set of transaction commits have released these buffers.
1302 */
1303 STATIC int
1304 xfs_attr_fillstate(xfs_da_state_t *state)
1305 {
1306 xfs_da_state_path_t *path;
1307 xfs_da_state_blk_t *blk;
1308 int level;
1309
1310 trace_xfs_attr_fillstate(state->args);
1311
1312 /*
1313 * Roll down the "path" in the state structure, storing the on-disk
1314 * block number for those buffers in the "path".
1315 */
1316 path = &state->path;
1317 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1318 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1319 if (blk->bp) {
1320 blk->disk_blkno = XFS_BUF_ADDR(blk->bp);
1321 blk->bp = NULL;
1322 } else {
1323 blk->disk_blkno = 0;
1324 }
1325 }
1326
1327 /*
1328 * Roll down the "altpath" in the state structure, storing the on-disk
1329 * block number for those buffers in the "altpath".
1330 */
1331 path = &state->altpath;
1332 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1333 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1334 if (blk->bp) {
1335 blk->disk_blkno = XFS_BUF_ADDR(blk->bp);
1336 blk->bp = NULL;
1337 } else {
1338 blk->disk_blkno = 0;
1339 }
1340 }
1341
1342 return 0;
1343 }
1344
1345 /*
1346 * Reattach the buffers to the state structure based on the disk block
1347 * numbers stored in the state structure.
1348 * This is done after some set of transaction commits have released those
1349 * buffers from our grip.
1350 */
1351 STATIC int
1352 xfs_attr_refillstate(xfs_da_state_t *state)
1353 {
1354 xfs_da_state_path_t *path;
1355 xfs_da_state_blk_t *blk;
1356 int level, error;
1357
1358 trace_xfs_attr_refillstate(state->args);
1359
1360 /*
1361 * Roll down the "path" in the state structure, storing the on-disk
1362 * block number for those buffers in the "path".
1363 */
1364 path = &state->path;
1365 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1366 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1367 if (blk->disk_blkno) {
1368 error = xfs_da3_node_read(state->args->trans,
1369 state->args->dp,
1370 blk->blkno, blk->disk_blkno,
1371 &blk->bp, XFS_ATTR_FORK);
1372 if (error)
1373 return error;
1374 } else {
1375 blk->bp = NULL;
1376 }
1377 }
1378
1379 /*
1380 * Roll down the "altpath" in the state structure, storing the on-disk
1381 * block number for those buffers in the "altpath".
1382 */
1383 path = &state->altpath;
1384 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1385 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1386 if (blk->disk_blkno) {
1387 error = xfs_da3_node_read(state->args->trans,
1388 state->args->dp,
1389 blk->blkno, blk->disk_blkno,
1390 &blk->bp, XFS_ATTR_FORK);
1391 if (error)
1392 return error;
1393 } else {
1394 blk->bp = NULL;
1395 }
1396 }
1397
1398 return 0;
1399 }
1400
1401 /*
1402 * Look up a filename in a node attribute list.
1403 *
1404 * This routine gets called for any attribute fork that has more than one
1405 * block, ie: both true Btree attr lists and for single-leaf-blocks with
1406 * "remote" values taking up more blocks.
1407 */
1408 STATIC int
1409 xfs_attr_node_get(xfs_da_args_t *args)
1410 {
1411 xfs_da_state_t *state;
1412 xfs_da_state_blk_t *blk;
1413 int error, retval;
1414 int i;
1415
1416 trace_xfs_attr_node_get(args);
1417
1418 state = xfs_da_state_alloc();
1419 state->args = args;
1420 state->mp = args->dp->i_mount;
1421
1422 /*
1423 * Search to see if name exists, and get back a pointer to it.
1424 */
1425 error = xfs_da3_node_lookup_int(state, &retval);
1426 if (error) {
1427 retval = error;
1428 } else if (retval == -EEXIST) {
1429 blk = &state->path.blk[ state->path.active-1 ];
1430 ASSERT(blk->bp != NULL);
1431 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1432
1433 /*
1434 * Get the value, local or "remote"
1435 */
1436 retval = xfs_attr3_leaf_getvalue(blk->bp, args);
1437 if (!retval && (args->rmtblkno > 0)
1438 && !(args->flags & ATTR_KERNOVAL)) {
1439 retval = xfs_attr_rmtval_get(args);
1440 }
1441 }
1442
1443 /*
1444 * If not in a transaction, we have to release all the buffers.
1445 */
1446 for (i = 0; i < state->path.active; i++) {
1447 xfs_trans_brelse(args->trans, state->path.blk[i].bp);
1448 state->path.blk[i].bp = NULL;
1449 }
1450
1451 xfs_da_state_free(state);
1452 return retval;
1453 }
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