projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branches 'device-groups', 'logitech' and 'multitouch' into for-linus
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / xfs / 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
19 #include "xfs.h"
20 #include "xfs_fs.h"
21 #include "xfs_types.h"
22 #include "xfs_bit.h"
23 #include "xfs_log.h"
24 #include "xfs_inum.h"
25 #include "xfs_trans.h"
26 #include "xfs_sb.h"
27 #include "xfs_ag.h"
28 #include "xfs_mount.h"
29 #include "xfs_da_btree.h"
30 #include "xfs_bmap_btree.h"
31 #include "xfs_attr_sf.h"
32 #include "xfs_dinode.h"
33 #include "xfs_inode.h"
34 #include "xfs_alloc.h"
35 #include "xfs_inode_item.h"
36 #include "xfs_bmap.h"
37 #include "xfs_attr.h"
38 #include "xfs_attr_leaf.h"
39 #include "xfs_error.h"
40 #include "xfs_quota.h"
41 #include "xfs_trans_space.h"
42 #include "xfs_rw.h"
43 #include "xfs_vnodeops.h"
44 #include "xfs_trace.h"
45
46 /*
47 * xfs_attr.c
48 *
49 * Provide the external interfaces to manage attribute lists.
50 */
51
52 /*========================================================================
53 * Function prototypes for the kernel.
54 *========================================================================*/
55
56 /*
57 * Internal routines when attribute list fits inside the inode.
58 */
59 STATIC int xfs_attr_shortform_addname(xfs_da_args_t *args);
60
61 /*
62 * Internal routines when attribute list is one block.
63 */
64 STATIC int xfs_attr_leaf_get(xfs_da_args_t *args);
65 STATIC int xfs_attr_leaf_addname(xfs_da_args_t *args);
66 STATIC int xfs_attr_leaf_removename(xfs_da_args_t *args);
67 STATIC int xfs_attr_leaf_list(xfs_attr_list_context_t *context);
68
69 /*
70 * Internal routines when attribute list is more than one block.
71 */
72 STATIC int xfs_attr_node_get(xfs_da_args_t *args);
73 STATIC int xfs_attr_node_addname(xfs_da_args_t *args);
74 STATIC int xfs_attr_node_removename(xfs_da_args_t *args);
75 STATIC int xfs_attr_node_list(xfs_attr_list_context_t *context);
76 STATIC int xfs_attr_fillstate(xfs_da_state_t *state);
77 STATIC int xfs_attr_refillstate(xfs_da_state_t *state);
78
79 /*
80 * Routines to manipulate out-of-line attribute values.
81 */
82 STATIC int xfs_attr_rmtval_set(xfs_da_args_t *args);
83 STATIC int xfs_attr_rmtval_remove(xfs_da_args_t *args);
84
85 #define ATTR_RMTVALUE_MAPSIZE 1 /* # of map entries at once */
86
87 STATIC int
88 xfs_attr_name_to_xname(
89 struct xfs_name *xname,
90 const unsigned char *aname)
91 {
92 if (!aname)
93 return EINVAL;
94 xname->name = aname;
95 xname->len = strlen((char *)aname);
96 if (xname->len >= MAXNAMELEN)
97 return EFAULT; /* match IRIX behaviour */
98
99 return 0;
100 }
101
102 STATIC int
103 xfs_inode_hasattr(
104 struct xfs_inode *ip)
105 {
106 if (!XFS_IFORK_Q(ip) ||
107 (ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
108 ip->i_d.di_anextents == 0))
109 return 0;
110 return 1;
111 }
112
113 /*========================================================================
114 * Overall external interface routines.
115 *========================================================================*/
116
117 STATIC int
118 xfs_attr_get_int(
119 struct xfs_inode *ip,
120 struct xfs_name *name,
121 unsigned char *value,
122 int *valuelenp,
123 int flags)
124 {
125 xfs_da_args_t args;
126 int error;
127
128 if (!xfs_inode_hasattr(ip))
129 return ENOATTR;
130
131 /*
132 * Fill in the arg structure for this request.
133 */
134 memset((char *)&args, 0, sizeof(args));
135 args.name = name->name;
136 args.namelen = name->len;
137 args.value = value;
138 args.valuelen = *valuelenp;
139 args.flags = flags;
140 args.hashval = xfs_da_hashname(args.name, args.namelen);
141 args.dp = ip;
142 args.whichfork = XFS_ATTR_FORK;
143
144 /*
145 * Decide on what work routines to call based on the inode size.
146 */
147 if (ip->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
148 error = xfs_attr_shortform_getvalue(&args);
149 } else if (xfs_bmap_one_block(ip, XFS_ATTR_FORK)) {
150 error = xfs_attr_leaf_get(&args);
151 } else {
152 error = xfs_attr_node_get(&args);
153 }
154
155 /*
156 * Return the number of bytes in the value to the caller.
157 */
158 *valuelenp = args.valuelen;
159
160 if (error == EEXIST)
161 error = 0;
162 return(error);
163 }
164
165 int
166 xfs_attr_get(
167 xfs_inode_t *ip,
168 const unsigned char *name,
169 unsigned char *value,
170 int *valuelenp,
171 int flags)
172 {
173 int error;
174 struct xfs_name xname;
175
176 XFS_STATS_INC(xs_attr_get);
177
178 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
179 return(EIO);
180
181 error = xfs_attr_name_to_xname(&xname, name);
182 if (error)
183 return error;
184
185 xfs_ilock(ip, XFS_ILOCK_SHARED);
186 error = xfs_attr_get_int(ip, &xname, value, valuelenp, flags);
187 xfs_iunlock(ip, XFS_ILOCK_SHARED);
188 return(error);
189 }
190
191 /*
192 * Calculate how many blocks we need for the new attribute,
193 */
194 STATIC int
195 xfs_attr_calc_size(
196 struct xfs_inode *ip,
197 int namelen,
198 int valuelen,
199 int *local)
200 {
201 struct xfs_mount *mp = ip->i_mount;
202 int size;
203 int nblks;
204
205 /*
206 * Determine space new attribute will use, and if it would be
207 * "local" or "remote" (note: local != inline).
208 */
209 size = xfs_attr_leaf_newentsize(namelen, valuelen,
210 mp->m_sb.sb_blocksize, local);
211
212 nblks = XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK);
213 if (*local) {
214 if (size > (mp->m_sb.sb_blocksize >> 1)) {
215 /* Double split possible */
216 nblks *= 2;
217 }
218 } else {
219 /*
220 * Out of line attribute, cannot double split, but
221 * make room for the attribute value itself.
222 */
223 uint dblocks = XFS_B_TO_FSB(mp, valuelen);
224 nblks += dblocks;
225 nblks += XFS_NEXTENTADD_SPACE_RES(mp, dblocks, XFS_ATTR_FORK);
226 }
227
228 return nblks;
229 }
230
231 STATIC int
232 xfs_attr_set_int(
233 struct xfs_inode *dp,
234 struct xfs_name *name,
235 unsigned char *value,
236 int valuelen,
237 int flags)
238 {
239 xfs_da_args_t args;
240 xfs_fsblock_t firstblock;
241 xfs_bmap_free_t flist;
242 int error, err2, committed;
243 xfs_mount_t *mp = dp->i_mount;
244 int rsvd = (flags & ATTR_ROOT) != 0;
245 int local;
246
247 /*
248 * Attach the dquots to the inode.
249 */
250 error = xfs_qm_dqattach(dp, 0);
251 if (error)
252 return error;
253
254 /*
255 * If the inode doesn't have an attribute fork, add one.
256 * (inode must not be locked when we call this routine)
257 */
258 if (XFS_IFORK_Q(dp) == 0) {
259 int sf_size = sizeof(xfs_attr_sf_hdr_t) +
260 XFS_ATTR_SF_ENTSIZE_BYNAME(name->len, valuelen);
261
262 if ((error = xfs_bmap_add_attrfork(dp, sf_size, rsvd)))
263 return(error);
264 }
265
266 /*
267 * Fill in the arg structure for this request.
268 */
269 memset((char *)&args, 0, sizeof(args));
270 args.name = name->name;
271 args.namelen = name->len;
272 args.value = value;
273 args.valuelen = valuelen;
274 args.flags = flags;
275 args.hashval = xfs_da_hashname(args.name, args.namelen);
276 args.dp = dp;
277 args.firstblock = &firstblock;
278 args.flist = &flist;
279 args.whichfork = XFS_ATTR_FORK;
280 args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
281
282 /* Size is now blocks for attribute data */
283 args.total = xfs_attr_calc_size(dp, name->len, valuelen, &local);
284
285 /*
286 * Start our first transaction of the day.
287 *
288 * All future transactions during this code must be "chained" off
289 * this one via the trans_dup() call. All transactions will contain
290 * the inode, and the inode will always be marked with trans_ihold().
291 * Since the inode will be locked in all transactions, we must log
292 * the inode in every transaction to let it float upward through
293 * the log.
294 */
295 args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_SET);
296
297 /*
298 * Root fork attributes can use reserved data blocks for this
299 * operation if necessary
300 */
301
302 if (rsvd)
303 args.trans->t_flags |= XFS_TRANS_RESERVE;
304
305 if ((error = xfs_trans_reserve(args.trans, args.total,
306 XFS_ATTRSET_LOG_RES(mp, args.total), 0,
307 XFS_TRANS_PERM_LOG_RES, XFS_ATTRSET_LOG_COUNT))) {
308 xfs_trans_cancel(args.trans, 0);
309 return(error);
310 }
311 xfs_ilock(dp, XFS_ILOCK_EXCL);
312
313 error = xfs_trans_reserve_quota_nblks(args.trans, dp, args.total, 0,
314 rsvd ? XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
315 XFS_QMOPT_RES_REGBLKS);
316 if (error) {
317 xfs_iunlock(dp, XFS_ILOCK_EXCL);
318 xfs_trans_cancel(args.trans, XFS_TRANS_RELEASE_LOG_RES);
319 return (error);
320 }
321
322 xfs_trans_ijoin(args.trans, dp, 0);
323
324 /*
325 * If the attribute list is non-existent or a shortform list,
326 * upgrade it to a single-leaf-block attribute list.
327 */
328 if ((dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
329 ((dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS) &&
330 (dp->i_d.di_anextents == 0))) {
331
332 /*
333 * Build initial attribute list (if required).
334 */
335 if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS)
336 xfs_attr_shortform_create(&args);
337
338 /*
339 * Try to add the attr to the attribute list in
340 * the inode.
341 */
342 error = xfs_attr_shortform_addname(&args);
343 if (error != ENOSPC) {
344 /*
345 * Commit the shortform mods, and we're done.
346 * NOTE: this is also the error path (EEXIST, etc).
347 */
348 ASSERT(args.trans != NULL);
349
350 /*
351 * If this is a synchronous mount, make sure that
352 * the transaction goes to disk before returning
353 * to the user.
354 */
355 if (mp->m_flags & XFS_MOUNT_WSYNC) {
356 xfs_trans_set_sync(args.trans);
357 }
358
359 if (!error && (flags & ATTR_KERNOTIME) == 0) {
360 xfs_trans_ichgtime(args.trans, dp,
361 XFS_ICHGTIME_CHG);
362 }
363 err2 = xfs_trans_commit(args.trans,
364 XFS_TRANS_RELEASE_LOG_RES);
365 xfs_iunlock(dp, XFS_ILOCK_EXCL);
366
367 return(error == 0 ? err2 : error);
368 }
369
370 /*
371 * It won't fit in the shortform, transform to a leaf block.
372 * GROT: another possible req'mt for a double-split btree op.
373 */
374 xfs_bmap_init(args.flist, args.firstblock);
375 error = xfs_attr_shortform_to_leaf(&args);
376 if (!error) {
377 error = xfs_bmap_finish(&args.trans, args.flist,
378 &committed);
379 }
380 if (error) {
381 ASSERT(committed);
382 args.trans = NULL;
383 xfs_bmap_cancel(&flist);
384 goto out;
385 }
386
387 /*
388 * bmap_finish() may have committed the last trans and started
389 * a new one. We need the inode to be in all transactions.
390 */
391 if (committed)
392 xfs_trans_ijoin(args.trans, dp, 0);
393
394 /*
395 * Commit the leaf transformation. We'll need another (linked)
396 * transaction to add the new attribute to the leaf.
397 */
398
399 error = xfs_trans_roll(&args.trans, dp);
400 if (error)
401 goto out;
402
403 }
404
405 if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
406 error = xfs_attr_leaf_addname(&args);
407 } else {
408 error = xfs_attr_node_addname(&args);
409 }
410 if (error) {
411 goto out;
412 }
413
414 /*
415 * If this is a synchronous mount, make sure that the
416 * transaction goes to disk before returning to the user.
417 */
418 if (mp->m_flags & XFS_MOUNT_WSYNC) {
419 xfs_trans_set_sync(args.trans);
420 }
421
422 if ((flags & ATTR_KERNOTIME) == 0)
423 xfs_trans_ichgtime(args.trans, dp, XFS_ICHGTIME_CHG);
424
425 /*
426 * Commit the last in the sequence of transactions.
427 */
428 xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
429 error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES);
430 xfs_iunlock(dp, XFS_ILOCK_EXCL);
431
432 return(error);
433
434 out:
435 if (args.trans)
436 xfs_trans_cancel(args.trans,
437 XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
438 xfs_iunlock(dp, XFS_ILOCK_EXCL);
439 return(error);
440 }
441
442 int
443 xfs_attr_set(
444 xfs_inode_t *dp,
445 const unsigned char *name,
446 unsigned char *value,
447 int valuelen,
448 int flags)
449 {
450 int error;
451 struct xfs_name xname;
452
453 XFS_STATS_INC(xs_attr_set);
454
455 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
456 return (EIO);
457
458 error = xfs_attr_name_to_xname(&xname, name);
459 if (error)
460 return error;
461
462 return xfs_attr_set_int(dp, &xname, value, valuelen, flags);
463 }
464
465 /*
466 * Generic handler routine to remove a name from an attribute list.
467 * Transitions attribute list from Btree to shortform as necessary.
468 */
469 STATIC int
470 xfs_attr_remove_int(xfs_inode_t *dp, struct xfs_name *name, int flags)
471 {
472 xfs_da_args_t args;
473 xfs_fsblock_t firstblock;
474 xfs_bmap_free_t flist;
475 int error;
476 xfs_mount_t *mp = dp->i_mount;
477
478 /*
479 * Fill in the arg structure for this request.
480 */
481 memset((char *)&args, 0, sizeof(args));
482 args.name = name->name;
483 args.namelen = name->len;
484 args.flags = flags;
485 args.hashval = xfs_da_hashname(args.name, args.namelen);
486 args.dp = dp;
487 args.firstblock = &firstblock;
488 args.flist = &flist;
489 args.total = 0;
490 args.whichfork = XFS_ATTR_FORK;
491
492 /*
493 * we have no control over the attribute names that userspace passes us
494 * to remove, so we have to allow the name lookup prior to attribute
495 * removal to fail.
496 */
497 args.op_flags = XFS_DA_OP_OKNOENT;
498
499 /*
500 * Attach the dquots to the inode.
501 */
502 error = xfs_qm_dqattach(dp, 0);
503 if (error)
504 return error;
505
506 /*
507 * Start our first transaction of the day.
508 *
509 * All future transactions during this code must be "chained" off
510 * this one via the trans_dup() call. All transactions will contain
511 * the inode, and the inode will always be marked with trans_ihold().
512 * Since the inode will be locked in all transactions, we must log
513 * the inode in every transaction to let it float upward through
514 * the log.
515 */
516 args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_RM);
517
518 /*
519 * Root fork attributes can use reserved data blocks for this
520 * operation if necessary
521 */
522
523 if (flags & ATTR_ROOT)
524 args.trans->t_flags |= XFS_TRANS_RESERVE;
525
526 if ((error = xfs_trans_reserve(args.trans,
527 XFS_ATTRRM_SPACE_RES(mp),
528 XFS_ATTRRM_LOG_RES(mp),
529 0, XFS_TRANS_PERM_LOG_RES,
530 XFS_ATTRRM_LOG_COUNT))) {
531 xfs_trans_cancel(args.trans, 0);
532 return(error);
533 }
534
535 xfs_ilock(dp, XFS_ILOCK_EXCL);
536 /*
537 * No need to make quota reservations here. We expect to release some
538 * blocks not allocate in the common case.
539 */
540 xfs_trans_ijoin(args.trans, dp, 0);
541
542 /*
543 * Decide on what work routines to call based on the inode size.
544 */
545 if (!xfs_inode_hasattr(dp)) {
546 error = XFS_ERROR(ENOATTR);
547 goto out;
548 }
549 if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
550 ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
551 error = xfs_attr_shortform_remove(&args);
552 if (error) {
553 goto out;
554 }
555 } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
556 error = xfs_attr_leaf_removename(&args);
557 } else {
558 error = xfs_attr_node_removename(&args);
559 }
560 if (error) {
561 goto out;
562 }
563
564 /*
565 * If this is a synchronous mount, make sure that the
566 * transaction goes to disk before returning to the user.
567 */
568 if (mp->m_flags & XFS_MOUNT_WSYNC) {
569 xfs_trans_set_sync(args.trans);
570 }
571
572 if ((flags & ATTR_KERNOTIME) == 0)
573 xfs_trans_ichgtime(args.trans, dp, XFS_ICHGTIME_CHG);
574
575 /*
576 * Commit the last in the sequence of transactions.
577 */
578 xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
579 error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES);
580 xfs_iunlock(dp, XFS_ILOCK_EXCL);
581
582 return(error);
583
584 out:
585 if (args.trans)
586 xfs_trans_cancel(args.trans,
587 XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
588 xfs_iunlock(dp, XFS_ILOCK_EXCL);
589 return(error);
590 }
591
592 int
593 xfs_attr_remove(
594 xfs_inode_t *dp,
595 const unsigned char *name,
596 int flags)
597 {
598 int error;
599 struct xfs_name xname;
600
601 XFS_STATS_INC(xs_attr_remove);
602
603 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
604 return (EIO);
605
606 error = xfs_attr_name_to_xname(&xname, name);
607 if (error)
608 return error;
609
610 xfs_ilock(dp, XFS_ILOCK_SHARED);
611 if (!xfs_inode_hasattr(dp)) {
612 xfs_iunlock(dp, XFS_ILOCK_SHARED);
613 return XFS_ERROR(ENOATTR);
614 }
615 xfs_iunlock(dp, XFS_ILOCK_SHARED);
616
617 return xfs_attr_remove_int(dp, &xname, flags);
618 }
619
620 int
621 xfs_attr_list_int(xfs_attr_list_context_t *context)
622 {
623 int error;
624 xfs_inode_t *dp = context->dp;
625
626 XFS_STATS_INC(xs_attr_list);
627
628 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
629 return EIO;
630
631 xfs_ilock(dp, XFS_ILOCK_SHARED);
632
633 /*
634 * Decide on what work routines to call based on the inode size.
635 */
636 if (!xfs_inode_hasattr(dp)) {
637 error = 0;
638 } else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
639 error = xfs_attr_shortform_list(context);
640 } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
641 error = xfs_attr_leaf_list(context);
642 } else {
643 error = xfs_attr_node_list(context);
644 }
645
646 xfs_iunlock(dp, XFS_ILOCK_SHARED);
647
648 return error;
649 }
650
651 #define ATTR_ENTBASESIZE /* minimum bytes used by an attr */ \
652 (((struct attrlist_ent *) 0)->a_name - (char *) 0)
653 #define ATTR_ENTSIZE(namelen) /* actual bytes used by an attr */ \
654 ((ATTR_ENTBASESIZE + (namelen) + 1 + sizeof(u_int32_t)-1) \
655 & ~(sizeof(u_int32_t)-1))
656
657 /*
658 * Format an attribute and copy it out to the user's buffer.
659 * Take care to check values and protect against them changing later,
660 * we may be reading them directly out of a user buffer.
661 */
662 /*ARGSUSED*/
663 STATIC int
664 xfs_attr_put_listent(
665 xfs_attr_list_context_t *context,
666 int flags,
667 unsigned char *name,
668 int namelen,
669 int valuelen,
670 unsigned char *value)
671 {
672 struct attrlist *alist = (struct attrlist *)context->alist;
673 attrlist_ent_t *aep;
674 int arraytop;
675
676 ASSERT(!(context->flags & ATTR_KERNOVAL));
677 ASSERT(context->count >= 0);
678 ASSERT(context->count < (ATTR_MAX_VALUELEN/8));
679 ASSERT(context->firstu >= sizeof(*alist));
680 ASSERT(context->firstu <= context->bufsize);
681
682 /*
683 * Only list entries in the right namespace.
684 */
685 if (((context->flags & ATTR_SECURE) == 0) !=
686 ((flags & XFS_ATTR_SECURE) == 0))
687 return 0;
688 if (((context->flags & ATTR_ROOT) == 0) !=
689 ((flags & XFS_ATTR_ROOT) == 0))
690 return 0;
691
692 arraytop = sizeof(*alist) +
693 context->count * sizeof(alist->al_offset[0]);
694 context->firstu -= ATTR_ENTSIZE(namelen);
695 if (context->firstu < arraytop) {
696 trace_xfs_attr_list_full(context);
697 alist->al_more = 1;
698 context->seen_enough = 1;
699 return 1;
700 }
701
702 aep = (attrlist_ent_t *)&context->alist[context->firstu];
703 aep->a_valuelen = valuelen;
704 memcpy(aep->a_name, name, namelen);
705 aep->a_name[namelen] = 0;
706 alist->al_offset[context->count++] = context->firstu;
707 alist->al_count = context->count;
708 trace_xfs_attr_list_add(context);
709 return 0;
710 }
711
712 /*
713 * Generate a list of extended attribute names and optionally
714 * also value lengths. Positive return value follows the XFS
715 * convention of being an error, zero or negative return code
716 * is the length of the buffer returned (negated), indicating
717 * success.
718 */
719 int
720 xfs_attr_list(
721 xfs_inode_t *dp,
722 char *buffer,
723 int bufsize,
724 int flags,
725 attrlist_cursor_kern_t *cursor)
726 {
727 xfs_attr_list_context_t context;
728 struct attrlist *alist;
729 int error;
730
731 /*
732 * Validate the cursor.
733 */
734 if (cursor->pad1 || cursor->pad2)
735 return(XFS_ERROR(EINVAL));
736 if ((cursor->initted == 0) &&
737 (cursor->hashval || cursor->blkno || cursor->offset))
738 return XFS_ERROR(EINVAL);
739
740 /*
741 * Check for a properly aligned buffer.
742 */
743 if (((long)buffer) & (sizeof(int)-1))
744 return XFS_ERROR(EFAULT);
745 if (flags & ATTR_KERNOVAL)
746 bufsize = 0;
747
748 /*
749 * Initialize the output buffer.
750 */
751 memset(&context, 0, sizeof(context));
752 context.dp = dp;
753 context.cursor = cursor;
754 context.resynch = 1;
755 context.flags = flags;
756 context.alist = buffer;
757 context.bufsize = (bufsize & ~(sizeof(int)-1)); /* align */
758 context.firstu = context.bufsize;
759 context.put_listent = xfs_attr_put_listent;
760
761 alist = (struct attrlist *)context.alist;
762 alist->al_count = 0;
763 alist->al_more = 0;
764 alist->al_offset[0] = context.bufsize;
765
766 error = xfs_attr_list_int(&context);
767 ASSERT(error >= 0);
768 return error;
769 }
770
771 int /* error */
772 xfs_attr_inactive(xfs_inode_t *dp)
773 {
774 xfs_trans_t *trans;
775 xfs_mount_t *mp;
776 int error;
777
778 mp = dp->i_mount;
779 ASSERT(! XFS_NOT_DQATTACHED(mp, dp));
780
781 xfs_ilock(dp, XFS_ILOCK_SHARED);
782 if (!xfs_inode_hasattr(dp) ||
783 dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
784 xfs_iunlock(dp, XFS_ILOCK_SHARED);
785 return 0;
786 }
787 xfs_iunlock(dp, XFS_ILOCK_SHARED);
788
789 /*
790 * Start our first transaction of the day.
791 *
792 * All future transactions during this code must be "chained" off
793 * this one via the trans_dup() call. All transactions will contain
794 * the inode, and the inode will always be marked with trans_ihold().
795 * Since the inode will be locked in all transactions, we must log
796 * the inode in every transaction to let it float upward through
797 * the log.
798 */
799 trans = xfs_trans_alloc(mp, XFS_TRANS_ATTRINVAL);
800 if ((error = xfs_trans_reserve(trans, 0, XFS_ATTRINVAL_LOG_RES(mp), 0,
801 XFS_TRANS_PERM_LOG_RES,
802 XFS_ATTRINVAL_LOG_COUNT))) {
803 xfs_trans_cancel(trans, 0);
804 return(error);
805 }
806 xfs_ilock(dp, XFS_ILOCK_EXCL);
807
808 /*
809 * No need to make quota reservations here. We expect to release some
810 * blocks, not allocate, in the common case.
811 */
812 xfs_trans_ijoin(trans, dp, 0);
813
814 /*
815 * Decide on what work routines to call based on the inode size.
816 */
817 if (!xfs_inode_hasattr(dp) ||
818 dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
819 error = 0;
820 goto out;
821 }
822 error = xfs_attr_root_inactive(&trans, dp);
823 if (error)
824 goto out;
825
826 error = xfs_itruncate_extents(&trans, dp, XFS_ATTR_FORK, 0);
827 if (error)
828 goto out;
829
830 error = xfs_trans_commit(trans, XFS_TRANS_RELEASE_LOG_RES);
831 xfs_iunlock(dp, XFS_ILOCK_EXCL);
832
833 return(error);
834
835 out:
836 xfs_trans_cancel(trans, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
837 xfs_iunlock(dp, XFS_ILOCK_EXCL);
838 return(error);
839 }
840
841
842
843 /*========================================================================
844 * External routines when attribute list is inside the inode
845 *========================================================================*/
846
847 /*
848 * Add a name to the shortform attribute list structure
849 * This is the external routine.
850 */
851 STATIC int
852 xfs_attr_shortform_addname(xfs_da_args_t *args)
853 {
854 int newsize, forkoff, retval;
855
856 trace_xfs_attr_sf_addname(args);
857
858 retval = xfs_attr_shortform_lookup(args);
859 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
860 return(retval);
861 } else if (retval == EEXIST) {
862 if (args->flags & ATTR_CREATE)
863 return(retval);
864 retval = xfs_attr_shortform_remove(args);
865 ASSERT(retval == 0);
866 }
867
868 if (args->namelen >= XFS_ATTR_SF_ENTSIZE_MAX ||
869 args->valuelen >= XFS_ATTR_SF_ENTSIZE_MAX)
870 return(XFS_ERROR(ENOSPC));
871
872 newsize = XFS_ATTR_SF_TOTSIZE(args->dp);
873 newsize += XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
874
875 forkoff = xfs_attr_shortform_bytesfit(args->dp, newsize);
876 if (!forkoff)
877 return(XFS_ERROR(ENOSPC));
878
879 xfs_attr_shortform_add(args, forkoff);
880 return(0);
881 }
882
883
884 /*========================================================================
885 * External routines when attribute list is one block
886 *========================================================================*/
887
888 /*
889 * Add a name to the leaf attribute list structure
890 *
891 * This leaf block cannot have a "remote" value, we only call this routine
892 * if bmap_one_block() says there is only one block (ie: no remote blks).
893 */
894 STATIC int
895 xfs_attr_leaf_addname(xfs_da_args_t *args)
896 {
897 xfs_inode_t *dp;
898 xfs_dabuf_t *bp;
899 int retval, error, committed, forkoff;
900
901 trace_xfs_attr_leaf_addname(args);
902
903 /*
904 * Read the (only) block in the attribute list in.
905 */
906 dp = args->dp;
907 args->blkno = 0;
908 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
909 XFS_ATTR_FORK);
910 if (error)
911 return(error);
912 ASSERT(bp != NULL);
913
914 /*
915 * Look up the given attribute in the leaf block. Figure out if
916 * the given flags produce an error or call for an atomic rename.
917 */
918 retval = xfs_attr_leaf_lookup_int(bp, args);
919 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
920 xfs_da_brelse(args->trans, bp);
921 return(retval);
922 } else if (retval == EEXIST) {
923 if (args->flags & ATTR_CREATE) { /* pure create op */
924 xfs_da_brelse(args->trans, bp);
925 return(retval);
926 }
927
928 trace_xfs_attr_leaf_replace(args);
929
930 args->op_flags |= XFS_DA_OP_RENAME; /* an atomic rename */
931 args->blkno2 = args->blkno; /* set 2nd entry info*/
932 args->index2 = args->index;
933 args->rmtblkno2 = args->rmtblkno;
934 args->rmtblkcnt2 = args->rmtblkcnt;
935 }
936
937 /*
938 * Add the attribute to the leaf block, transitioning to a Btree
939 * if required.
940 */
941 retval = xfs_attr_leaf_add(bp, args);
942 xfs_da_buf_done(bp);
943 if (retval == ENOSPC) {
944 /*
945 * Promote the attribute list to the Btree format, then
946 * Commit that transaction so that the node_addname() call
947 * can manage its own transactions.
948 */
949 xfs_bmap_init(args->flist, args->firstblock);
950 error = xfs_attr_leaf_to_node(args);
951 if (!error) {
952 error = xfs_bmap_finish(&args->trans, args->flist,
953 &committed);
954 }
955 if (error) {
956 ASSERT(committed);
957 args->trans = NULL;
958 xfs_bmap_cancel(args->flist);
959 return(error);
960 }
961
962 /*
963 * bmap_finish() may have committed the last trans and started
964 * a new one. We need the inode to be in all transactions.
965 */
966 if (committed)
967 xfs_trans_ijoin(args->trans, dp, 0);
968
969 /*
970 * Commit the current trans (including the inode) and start
971 * a new one.
972 */
973 error = xfs_trans_roll(&args->trans, dp);
974 if (error)
975 return (error);
976
977 /*
978 * Fob the whole rest of the problem off on the Btree code.
979 */
980 error = xfs_attr_node_addname(args);
981 return(error);
982 }
983
984 /*
985 * Commit the transaction that added the attr name so that
986 * later routines can manage their own transactions.
987 */
988 error = xfs_trans_roll(&args->trans, dp);
989 if (error)
990 return (error);
991
992 /*
993 * If there was an out-of-line value, allocate the blocks we
994 * identified for its storage and copy the value. This is done
995 * after we create the attribute so that we don't overflow the
996 * maximum size of a transaction and/or hit a deadlock.
997 */
998 if (args->rmtblkno > 0) {
999 error = xfs_attr_rmtval_set(args);
1000 if (error)
1001 return(error);
1002 }
1003
1004 /*
1005 * If this is an atomic rename operation, we must "flip" the
1006 * incomplete flags on the "new" and "old" attribute/value pairs
1007 * so that one disappears and one appears atomically. Then we
1008 * must remove the "old" attribute/value pair.
1009 */
1010 if (args->op_flags & XFS_DA_OP_RENAME) {
1011 /*
1012 * In a separate transaction, set the incomplete flag on the
1013 * "old" attr and clear the incomplete flag on the "new" attr.
1014 */
1015 error = xfs_attr_leaf_flipflags(args);
1016 if (error)
1017 return(error);
1018
1019 /*
1020 * Dismantle the "old" attribute/value pair by removing
1021 * a "remote" value (if it exists).
1022 */
1023 args->index = args->index2;
1024 args->blkno = args->blkno2;
1025 args->rmtblkno = args->rmtblkno2;
1026 args->rmtblkcnt = args->rmtblkcnt2;
1027 if (args->rmtblkno) {
1028 error = xfs_attr_rmtval_remove(args);
1029 if (error)
1030 return(error);
1031 }
1032
1033 /*
1034 * Read in the block containing the "old" attr, then
1035 * remove the "old" attr from that block (neat, huh!)
1036 */
1037 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1,
1038 &bp, XFS_ATTR_FORK);
1039 if (error)
1040 return(error);
1041 ASSERT(bp != NULL);
1042 (void)xfs_attr_leaf_remove(bp, args);
1043
1044 /*
1045 * If the result is small enough, shrink it all into the inode.
1046 */
1047 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1048 xfs_bmap_init(args->flist, args->firstblock);
1049 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1050 /* bp is gone due to xfs_da_shrink_inode */
1051 if (!error) {
1052 error = xfs_bmap_finish(&args->trans,
1053 args->flist,
1054 &committed);
1055 }
1056 if (error) {
1057 ASSERT(committed);
1058 args->trans = NULL;
1059 xfs_bmap_cancel(args->flist);
1060 return(error);
1061 }
1062
1063 /*
1064 * bmap_finish() may have committed the last trans
1065 * and started a new one. We need the inode to be
1066 * in all transactions.
1067 */
1068 if (committed)
1069 xfs_trans_ijoin(args->trans, dp, 0);
1070 } else
1071 xfs_da_buf_done(bp);
1072
1073 /*
1074 * Commit the remove and start the next trans in series.
1075 */
1076 error = xfs_trans_roll(&args->trans, dp);
1077
1078 } else if (args->rmtblkno > 0) {
1079 /*
1080 * Added a "remote" value, just clear the incomplete flag.
1081 */
1082 error = xfs_attr_leaf_clearflag(args);
1083 }
1084 return(error);
1085 }
1086
1087 /*
1088 * Remove a name from the leaf attribute list structure
1089 *
1090 * This leaf block cannot have a "remote" value, we only call this routine
1091 * if bmap_one_block() says there is only one block (ie: no remote blks).
1092 */
1093 STATIC int
1094 xfs_attr_leaf_removename(xfs_da_args_t *args)
1095 {
1096 xfs_inode_t *dp;
1097 xfs_dabuf_t *bp;
1098 int error, committed, forkoff;
1099
1100 trace_xfs_attr_leaf_removename(args);
1101
1102 /*
1103 * Remove the attribute.
1104 */
1105 dp = args->dp;
1106 args->blkno = 0;
1107 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
1108 XFS_ATTR_FORK);
1109 if (error) {
1110 return(error);
1111 }
1112
1113 ASSERT(bp != NULL);
1114 error = xfs_attr_leaf_lookup_int(bp, args);
1115 if (error == ENOATTR) {
1116 xfs_da_brelse(args->trans, bp);
1117 return(error);
1118 }
1119
1120 (void)xfs_attr_leaf_remove(bp, args);
1121
1122 /*
1123 * If the result is small enough, shrink it all into the inode.
1124 */
1125 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1126 xfs_bmap_init(args->flist, args->firstblock);
1127 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1128 /* bp is gone due to xfs_da_shrink_inode */
1129 if (!error) {
1130 error = xfs_bmap_finish(&args->trans, args->flist,
1131 &committed);
1132 }
1133 if (error) {
1134 ASSERT(committed);
1135 args->trans = NULL;
1136 xfs_bmap_cancel(args->flist);
1137 return(error);
1138 }
1139
1140 /*
1141 * bmap_finish() may have committed the last trans and started
1142 * a new one. We need the inode to be in all transactions.
1143 */
1144 if (committed)
1145 xfs_trans_ijoin(args->trans, dp, 0);
1146 } else
1147 xfs_da_buf_done(bp);
1148 return(0);
1149 }
1150
1151 /*
1152 * Look up a name in a leaf attribute list structure.
1153 *
1154 * This leaf block cannot have a "remote" value, we only call this routine
1155 * if bmap_one_block() says there is only one block (ie: no remote blks).
1156 */
1157 STATIC int
1158 xfs_attr_leaf_get(xfs_da_args_t *args)
1159 {
1160 xfs_dabuf_t *bp;
1161 int error;
1162
1163 args->blkno = 0;
1164 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
1165 XFS_ATTR_FORK);
1166 if (error)
1167 return(error);
1168 ASSERT(bp != NULL);
1169
1170 error = xfs_attr_leaf_lookup_int(bp, args);
1171 if (error != EEXIST) {
1172 xfs_da_brelse(args->trans, bp);
1173 return(error);
1174 }
1175 error = xfs_attr_leaf_getvalue(bp, args);
1176 xfs_da_brelse(args->trans, bp);
1177 if (!error && (args->rmtblkno > 0) && !(args->flags & ATTR_KERNOVAL)) {
1178 error = xfs_attr_rmtval_get(args);
1179 }
1180 return(error);
1181 }
1182
1183 /*
1184 * Copy out attribute entries for attr_list(), for leaf attribute lists.
1185 */
1186 STATIC int
1187 xfs_attr_leaf_list(xfs_attr_list_context_t *context)
1188 {
1189 xfs_attr_leafblock_t *leaf;
1190 int error;
1191 xfs_dabuf_t *bp;
1192
1193 context->cursor->blkno = 0;
1194 error = xfs_da_read_buf(NULL, context->dp, 0, -1, &bp, XFS_ATTR_FORK);
1195 if (error)
1196 return XFS_ERROR(error);
1197 ASSERT(bp != NULL);
1198 leaf = bp->data;
1199 if (unlikely(leaf->hdr.info.magic != cpu_to_be16(XFS_ATTR_LEAF_MAGIC))) {
1200 XFS_CORRUPTION_ERROR("xfs_attr_leaf_list", XFS_ERRLEVEL_LOW,
1201 context->dp->i_mount, leaf);
1202 xfs_da_brelse(NULL, bp);
1203 return XFS_ERROR(EFSCORRUPTED);
1204 }
1205
1206 error = xfs_attr_leaf_list_int(bp, context);
1207 xfs_da_brelse(NULL, bp);
1208 return XFS_ERROR(error);
1209 }
1210
1211
1212 /*========================================================================
1213 * External routines when attribute list size > XFS_LBSIZE(mp).
1214 *========================================================================*/
1215
1216 /*
1217 * Add a name to a Btree-format attribute list.
1218 *
1219 * This will involve walking down the Btree, and may involve splitting
1220 * leaf nodes and even splitting intermediate nodes up to and including
1221 * the root node (a special case of an intermediate node).
1222 *
1223 * "Remote" attribute values confuse the issue and atomic rename operations
1224 * add a whole extra layer of confusion on top of that.
1225 */
1226 STATIC int
1227 xfs_attr_node_addname(xfs_da_args_t *args)
1228 {
1229 xfs_da_state_t *state;
1230 xfs_da_state_blk_t *blk;
1231 xfs_inode_t *dp;
1232 xfs_mount_t *mp;
1233 int committed, retval, error;
1234
1235 trace_xfs_attr_node_addname(args);
1236
1237 /*
1238 * Fill in bucket of arguments/results/context to carry around.
1239 */
1240 dp = args->dp;
1241 mp = dp->i_mount;
1242 restart:
1243 state = xfs_da_state_alloc();
1244 state->args = args;
1245 state->mp = mp;
1246 state->blocksize = state->mp->m_sb.sb_blocksize;
1247 state->node_ents = state->mp->m_attr_node_ents;
1248
1249 /*
1250 * Search to see if name already exists, and get back a pointer
1251 * to where it should go.
1252 */
1253 error = xfs_da_node_lookup_int(state, &retval);
1254 if (error)
1255 goto out;
1256 blk = &state->path.blk[ state->path.active-1 ];
1257 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1258 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
1259 goto out;
1260 } else if (retval == EEXIST) {
1261 if (args->flags & ATTR_CREATE)
1262 goto out;
1263
1264 trace_xfs_attr_node_replace(args);
1265
1266 args->op_flags |= XFS_DA_OP_RENAME; /* atomic rename op */
1267 args->blkno2 = args->blkno; /* set 2nd entry info*/
1268 args->index2 = args->index;
1269 args->rmtblkno2 = args->rmtblkno;
1270 args->rmtblkcnt2 = args->rmtblkcnt;
1271 args->rmtblkno = 0;
1272 args->rmtblkcnt = 0;
1273 }
1274
1275 retval = xfs_attr_leaf_add(blk->bp, state->args);
1276 if (retval == ENOSPC) {
1277 if (state->path.active == 1) {
1278 /*
1279 * Its really a single leaf node, but it had
1280 * out-of-line values so it looked like it *might*
1281 * have been a b-tree.
1282 */
1283 xfs_da_state_free(state);
1284 xfs_bmap_init(args->flist, args->firstblock);
1285 error = xfs_attr_leaf_to_node(args);
1286 if (!error) {
1287 error = xfs_bmap_finish(&args->trans,
1288 args->flist,
1289 &committed);
1290 }
1291 if (error) {
1292 ASSERT(committed);
1293 args->trans = NULL;
1294 xfs_bmap_cancel(args->flist);
1295 goto out;
1296 }
1297
1298 /*
1299 * bmap_finish() may have committed the last trans
1300 * and started a new one. We need the inode to be
1301 * in all transactions.
1302 */
1303 if (committed)
1304 xfs_trans_ijoin(args->trans, dp, 0);
1305
1306 /*
1307 * Commit the node conversion and start the next
1308 * trans in the chain.
1309 */
1310 error = xfs_trans_roll(&args->trans, dp);
1311 if (error)
1312 goto out;
1313
1314 goto restart;
1315 }
1316
1317 /*
1318 * Split as many Btree elements as required.
1319 * This code tracks the new and old attr's location
1320 * in the index/blkno/rmtblkno/rmtblkcnt fields and
1321 * in the index2/blkno2/rmtblkno2/rmtblkcnt2 fields.
1322 */
1323 xfs_bmap_init(args->flist, args->firstblock);
1324 error = xfs_da_split(state);
1325 if (!error) {
1326 error = xfs_bmap_finish(&args->trans, args->flist,
1327 &committed);
1328 }
1329 if (error) {
1330 ASSERT(committed);
1331 args->trans = NULL;
1332 xfs_bmap_cancel(args->flist);
1333 goto out;
1334 }
1335
1336 /*
1337 * bmap_finish() may have committed the last trans and started
1338 * a new one. We need the inode to be in all transactions.
1339 */
1340 if (committed)
1341 xfs_trans_ijoin(args->trans, dp, 0);
1342 } else {
1343 /*
1344 * Addition succeeded, update Btree hashvals.
1345 */
1346 xfs_da_fixhashpath(state, &state->path);
1347 }
1348
1349 /*
1350 * Kill the state structure, we're done with it and need to
1351 * allow the buffers to come back later.
1352 */
1353 xfs_da_state_free(state);
1354 state = NULL;
1355
1356 /*
1357 * Commit the leaf addition or btree split and start the next
1358 * trans in the chain.
1359 */
1360 error = xfs_trans_roll(&args->trans, dp);
1361 if (error)
1362 goto out;
1363
1364 /*
1365 * If there was an out-of-line value, allocate the blocks we
1366 * identified for its storage and copy the value. This is done
1367 * after we create the attribute so that we don't overflow the
1368 * maximum size of a transaction and/or hit a deadlock.
1369 */
1370 if (args->rmtblkno > 0) {
1371 error = xfs_attr_rmtval_set(args);
1372 if (error)
1373 return(error);
1374 }
1375
1376 /*
1377 * If this is an atomic rename operation, we must "flip" the
1378 * incomplete flags on the "new" and "old" attribute/value pairs
1379 * so that one disappears and one appears atomically. Then we
1380 * must remove the "old" attribute/value pair.
1381 */
1382 if (args->op_flags & XFS_DA_OP_RENAME) {
1383 /*
1384 * In a separate transaction, set the incomplete flag on the
1385 * "old" attr and clear the incomplete flag on the "new" attr.
1386 */
1387 error = xfs_attr_leaf_flipflags(args);
1388 if (error)
1389 goto out;
1390
1391 /*
1392 * Dismantle the "old" attribute/value pair by removing
1393 * a "remote" value (if it exists).
1394 */
1395 args->index = args->index2;
1396 args->blkno = args->blkno2;
1397 args->rmtblkno = args->rmtblkno2;
1398 args->rmtblkcnt = args->rmtblkcnt2;
1399 if (args->rmtblkno) {
1400 error = xfs_attr_rmtval_remove(args);
1401 if (error)
1402 return(error);
1403 }
1404
1405 /*
1406 * Re-find the "old" attribute entry after any split ops.
1407 * The INCOMPLETE flag means that we will find the "old"
1408 * attr, not the "new" one.
1409 */
1410 args->flags |= XFS_ATTR_INCOMPLETE;
1411 state = xfs_da_state_alloc();
1412 state->args = args;
1413 state->mp = mp;
1414 state->blocksize = state->mp->m_sb.sb_blocksize;
1415 state->node_ents = state->mp->m_attr_node_ents;
1416 state->inleaf = 0;
1417 error = xfs_da_node_lookup_int(state, &retval);
1418 if (error)
1419 goto out;
1420
1421 /*
1422 * Remove the name and update the hashvals in the tree.
1423 */
1424 blk = &state->path.blk[ state->path.active-1 ];
1425 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1426 error = xfs_attr_leaf_remove(blk->bp, args);
1427 xfs_da_fixhashpath(state, &state->path);
1428
1429 /*
1430 * Check to see if the tree needs to be collapsed.
1431 */
1432 if (retval && (state->path.active > 1)) {
1433 xfs_bmap_init(args->flist, args->firstblock);
1434 error = xfs_da_join(state);
1435 if (!error) {
1436 error = xfs_bmap_finish(&args->trans,
1437 args->flist,
1438 &committed);
1439 }
1440 if (error) {
1441 ASSERT(committed);
1442 args->trans = NULL;
1443 xfs_bmap_cancel(args->flist);
1444 goto out;
1445 }
1446
1447 /*
1448 * bmap_finish() may have committed the last trans
1449 * and started a new one. We need the inode to be
1450 * in all transactions.
1451 */
1452 if (committed)
1453 xfs_trans_ijoin(args->trans, dp, 0);
1454 }
1455
1456 /*
1457 * Commit and start the next trans in the chain.
1458 */
1459 error = xfs_trans_roll(&args->trans, dp);
1460 if (error)
1461 goto out;
1462
1463 } else if (args->rmtblkno > 0) {
1464 /*
1465 * Added a "remote" value, just clear the incomplete flag.
1466 */
1467 error = xfs_attr_leaf_clearflag(args);
1468 if (error)
1469 goto out;
1470 }
1471 retval = error = 0;
1472
1473 out:
1474 if (state)
1475 xfs_da_state_free(state);
1476 if (error)
1477 return(error);
1478 return(retval);
1479 }
1480
1481 /*
1482 * Remove a name from a B-tree attribute list.
1483 *
1484 * This will involve walking down the Btree, and may involve joining
1485 * leaf nodes and even joining intermediate nodes up to and including
1486 * the root node (a special case of an intermediate node).
1487 */
1488 STATIC int
1489 xfs_attr_node_removename(xfs_da_args_t *args)
1490 {
1491 xfs_da_state_t *state;
1492 xfs_da_state_blk_t *blk;
1493 xfs_inode_t *dp;
1494 xfs_dabuf_t *bp;
1495 int retval, error, committed, forkoff;
1496
1497 trace_xfs_attr_node_removename(args);
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, 0);
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, 0);
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_read(args->dp, (xfs_fileoff_t)lblkno,
1979 args->rmtblkcnt, map, &nmap,
1980 XFS_BMAPI_ATTRFORK);
1981 if (error)
1982 return(error);
1983 ASSERT(nmap >= 1);
1984
1985 for (i = 0; (i < nmap) && (valuelen > 0); i++) {
1986 ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) &&
1987 (map[i].br_startblock != HOLESTARTBLOCK));
1988 dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock);
1989 blkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
1990 error = xfs_read_buf(mp, mp->m_ddev_targp, dblkno,
1991 blkcnt, XBF_LOCK | XBF_DONT_BLOCK,
1992 &bp);
1993 if (error)
1994 return(error);
1995
1996 tmp = (valuelen < XFS_BUF_SIZE(bp))
1997 ? valuelen : XFS_BUF_SIZE(bp);
1998 xfs_buf_iomove(bp, 0, tmp, dst, XBRW_READ);
1999 xfs_buf_relse(bp);
2000 dst += tmp;
2001 valuelen -= tmp;
2002
2003 lblkno += map[i].br_blockcount;
2004 }
2005 }
2006 ASSERT(valuelen == 0);
2007 return(0);
2008 }
2009
2010 /*
2011 * Write the value associated with an attribute into the out-of-line buffer
2012 * that we have defined for it.
2013 */
2014 STATIC int
2015 xfs_attr_rmtval_set(xfs_da_args_t *args)
2016 {
2017 xfs_mount_t *mp;
2018 xfs_fileoff_t lfileoff;
2019 xfs_inode_t *dp;
2020 xfs_bmbt_irec_t map;
2021 xfs_daddr_t dblkno;
2022 void *src;
2023 xfs_buf_t *bp;
2024 xfs_dablk_t lblkno;
2025 int blkcnt, valuelen, nmap, error, tmp, committed;
2026
2027 dp = args->dp;
2028 mp = dp->i_mount;
2029 src = args->value;
2030
2031 /*
2032 * Find a "hole" in the attribute address space large enough for
2033 * us to drop the new attribute's value into.
2034 */
2035 blkcnt = XFS_B_TO_FSB(mp, args->valuelen);
2036 lfileoff = 0;
2037 error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff,
2038 XFS_ATTR_FORK);
2039 if (error) {
2040 return(error);
2041 }
2042 args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff;
2043 args->rmtblkcnt = blkcnt;
2044
2045 /*
2046 * Roll through the "value", allocating blocks on disk as required.
2047 */
2048 while (blkcnt > 0) {
2049 /*
2050 * Allocate a single extent, up to the size of the value.
2051 */
2052 xfs_bmap_init(args->flist, args->firstblock);
2053 nmap = 1;
2054 error = xfs_bmapi_write(args->trans, dp, (xfs_fileoff_t)lblkno,
2055 blkcnt,
2056 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2057 args->firstblock, args->total, &map, &nmap,
2058 args->flist);
2059 if (!error) {
2060 error = xfs_bmap_finish(&args->trans, args->flist,
2061 &committed);
2062 }
2063 if (error) {
2064 ASSERT(committed);
2065 args->trans = NULL;
2066 xfs_bmap_cancel(args->flist);
2067 return(error);
2068 }
2069
2070 /*
2071 * bmap_finish() may have committed the last trans and started
2072 * a new one. We need the inode to be in all transactions.
2073 */
2074 if (committed)
2075 xfs_trans_ijoin(args->trans, dp, 0);
2076
2077 ASSERT(nmap == 1);
2078 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2079 (map.br_startblock != HOLESTARTBLOCK));
2080 lblkno += map.br_blockcount;
2081 blkcnt -= map.br_blockcount;
2082
2083 /*
2084 * Start the next trans in the chain.
2085 */
2086 error = xfs_trans_roll(&args->trans, dp);
2087 if (error)
2088 return (error);
2089 }
2090
2091 /*
2092 * Roll through the "value", copying the attribute value to the
2093 * already-allocated blocks. Blocks are written synchronously
2094 * so that we can know they are all on disk before we turn off
2095 * the INCOMPLETE flag.
2096 */
2097 lblkno = args->rmtblkno;
2098 valuelen = args->valuelen;
2099 while (valuelen > 0) {
2100 /*
2101 * Try to remember where we decided to put the value.
2102 */
2103 xfs_bmap_init(args->flist, args->firstblock);
2104 nmap = 1;
2105 error = xfs_bmapi_read(dp, (xfs_fileoff_t)lblkno,
2106 args->rmtblkcnt, &map, &nmap,
2107 XFS_BMAPI_ATTRFORK);
2108 if (error)
2109 return(error);
2110 ASSERT(nmap == 1);
2111 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2112 (map.br_startblock != HOLESTARTBLOCK));
2113
2114 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
2115 blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
2116
2117 bp = xfs_buf_get(mp->m_ddev_targp, dblkno, blkcnt,
2118 XBF_LOCK | XBF_DONT_BLOCK);
2119 if (!bp)
2120 return ENOMEM;
2121 tmp = (valuelen < XFS_BUF_SIZE(bp)) ? valuelen :
2122 XFS_BUF_SIZE(bp);
2123 xfs_buf_iomove(bp, 0, tmp, src, XBRW_WRITE);
2124 if (tmp < XFS_BUF_SIZE(bp))
2125 xfs_buf_zero(bp, tmp, XFS_BUF_SIZE(bp) - tmp);
2126 error = xfs_bwrite(bp); /* GROT: NOTE: synchronous write */
2127 xfs_buf_relse(bp);
2128 if (error)
2129 return error;
2130 src += tmp;
2131 valuelen -= tmp;
2132
2133 lblkno += map.br_blockcount;
2134 }
2135 ASSERT(valuelen == 0);
2136 return(0);
2137 }
2138
2139 /*
2140 * Remove the value associated with an attribute by deleting the
2141 * out-of-line buffer that it is stored on.
2142 */
2143 STATIC int
2144 xfs_attr_rmtval_remove(xfs_da_args_t *args)
2145 {
2146 xfs_mount_t *mp;
2147 xfs_bmbt_irec_t map;
2148 xfs_buf_t *bp;
2149 xfs_daddr_t dblkno;
2150 xfs_dablk_t lblkno;
2151 int valuelen, blkcnt, nmap, error, done, committed;
2152
2153 mp = args->dp->i_mount;
2154
2155 /*
2156 * Roll through the "value", invalidating the attribute value's
2157 * blocks.
2158 */
2159 lblkno = args->rmtblkno;
2160 valuelen = args->rmtblkcnt;
2161 while (valuelen > 0) {
2162 /*
2163 * Try to remember where we decided to put the value.
2164 */
2165 nmap = 1;
2166 error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno,
2167 args->rmtblkcnt, &map, &nmap,
2168 XFS_BMAPI_ATTRFORK);
2169 if (error)
2170 return(error);
2171 ASSERT(nmap == 1);
2172 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2173 (map.br_startblock != HOLESTARTBLOCK));
2174
2175 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
2176 blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
2177
2178 /*
2179 * If the "remote" value is in the cache, remove it.
2180 */
2181 bp = xfs_incore(mp->m_ddev_targp, dblkno, blkcnt, XBF_TRYLOCK);
2182 if (bp) {
2183 xfs_buf_stale(bp);
2184 xfs_buf_relse(bp);
2185 bp = NULL;
2186 }
2187
2188 valuelen -= map.br_blockcount;
2189
2190 lblkno += map.br_blockcount;
2191 }
2192
2193 /*
2194 * Keep de-allocating extents until the remote-value region is gone.
2195 */
2196 lblkno = args->rmtblkno;
2197 blkcnt = args->rmtblkcnt;
2198 done = 0;
2199 while (!done) {
2200 xfs_bmap_init(args->flist, args->firstblock);
2201 error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt,
2202 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2203 1, args->firstblock, args->flist,
2204 &done);
2205 if (!error) {
2206 error = xfs_bmap_finish(&args->trans, args->flist,
2207 &committed);
2208 }
2209 if (error) {
2210 ASSERT(committed);
2211 args->trans = NULL;
2212 xfs_bmap_cancel(args->flist);
2213 return(error);
2214 }
2215
2216 /*
2217 * bmap_finish() may have committed the last trans and started
2218 * a new one. We need the inode to be in all transactions.
2219 */
2220 if (committed)
2221 xfs_trans_ijoin(args->trans, args->dp, 0);
2222
2223 /*
2224 * Close out trans and start the next one in the chain.
2225 */
2226 error = xfs_trans_roll(&args->trans, args->dp);
2227 if (error)
2228 return (error);
2229 }
2230 return(0);
2231 }
kernel source for telekom puls (alcatel/mediatek)