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agp: fix arbitrary kernel memory writes
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / xfs / xfs_attr.c
blobe953b6cfb2a85e3f35116180e52ae473e26466a9
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_dir2.h"
29 #include "xfs_dmapi.h"
30 #include "xfs_mount.h"
31 #include "xfs_da_btree.h"
32 #include "xfs_bmap_btree.h"
33 #include "xfs_alloc_btree.h"
34 #include "xfs_ialloc_btree.h"
35 #include "xfs_dir2_sf.h"
36 #include "xfs_attr_sf.h"
37 #include "xfs_dinode.h"
38 #include "xfs_inode.h"
39 #include "xfs_alloc.h"
40 #include "xfs_btree.h"
41 #include "xfs_inode_item.h"
42 #include "xfs_bmap.h"
43 #include "xfs_attr.h"
44 #include "xfs_attr_leaf.h"
45 #include "xfs_error.h"
46 #include "xfs_quota.h"
47 #include "xfs_trans_space.h"
48 #include "xfs_rw.h"
49 #include "xfs_vnodeops.h"
50 #include "xfs_trace.h"
51
52 /*
53 * xfs_attr.c
54 *
55 * Provide the external interfaces to manage attribute lists.
56 */
57
58 /*========================================================================
59 * Function prototypes for the kernel.
60 *========================================================================*/
61
62 /*
63 * Internal routines when attribute list fits inside the inode.
64 */
65 STATIC int xfs_attr_shortform_addname(xfs_da_args_t *args);
66
67 /*
68 * Internal routines when attribute list is one block.
69 */
70 STATIC int xfs_attr_leaf_get(xfs_da_args_t *args);
71 STATIC int xfs_attr_leaf_addname(xfs_da_args_t *args);
72 STATIC int xfs_attr_leaf_removename(xfs_da_args_t *args);
73 STATIC int xfs_attr_leaf_list(xfs_attr_list_context_t *context);
74
75 /*
76 * Internal routines when attribute list is more than one block.
77 */
78 STATIC int xfs_attr_node_get(xfs_da_args_t *args);
79 STATIC int xfs_attr_node_addname(xfs_da_args_t *args);
80 STATIC int xfs_attr_node_removename(xfs_da_args_t *args);
81 STATIC int xfs_attr_node_list(xfs_attr_list_context_t *context);
82 STATIC int xfs_attr_fillstate(xfs_da_state_t *state);
83 STATIC int xfs_attr_refillstate(xfs_da_state_t *state);
84
85 /*
86 * Routines to manipulate out-of-line attribute values.
87 */
88 STATIC int xfs_attr_rmtval_set(xfs_da_args_t *args);
89 STATIC int xfs_attr_rmtval_remove(xfs_da_args_t *args);
90
91 #define ATTR_RMTVALUE_MAPSIZE 1 /* # of map entries at once */
92
93 STATIC int
94 xfs_attr_name_to_xname(
95 struct xfs_name *xname,
96 const char *aname)
97 {
98 if (!aname)
99 return EINVAL;
100 xname->name = aname;
101 xname->len = strlen(aname);
102 if (xname->len >= MAXNAMELEN)
103 return EFAULT; /* match IRIX behaviour */
104
105 return 0;
106 }
107
108 STATIC int
109 xfs_inode_hasattr(
110 struct xfs_inode *ip)
111 {
112 if (!XFS_IFORK_Q(ip) ||
113 (ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
114 ip->i_d.di_anextents == 0))
115 return 0;
116 return 1;
117 }
118
119 /*========================================================================
120 * Overall external interface routines.
121 *========================================================================*/
122
123 STATIC int
124 xfs_attr_get_int(
125 struct xfs_inode *ip,
126 struct xfs_name *name,
127 char *value,
128 int *valuelenp,
129 int flags)
130 {
131 xfs_da_args_t args;
132 int error;
133
134 if (!xfs_inode_hasattr(ip))
135 return ENOATTR;
136
137 /*
138 * Fill in the arg structure for this request.
139 */
140 memset((char *)&args, 0, sizeof(args));
141 args.name = name->name;
142 args.namelen = name->len;
143 args.value = value;
144 args.valuelen = *valuelenp;
145 args.flags = flags;
146 args.hashval = xfs_da_hashname(args.name, args.namelen);
147 args.dp = ip;
148 args.whichfork = XFS_ATTR_FORK;
149
150 /*
151 * Decide on what work routines to call based on the inode size.
152 */
153 if (ip->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
154 error = xfs_attr_shortform_getvalue(&args);
155 } else if (xfs_bmap_one_block(ip, XFS_ATTR_FORK)) {
156 error = xfs_attr_leaf_get(&args);
157 } else {
158 error = xfs_attr_node_get(&args);
159 }
160
161 /*
162 * Return the number of bytes in the value to the caller.
163 */
164 *valuelenp = args.valuelen;
165
166 if (error == EEXIST)
167 error = 0;
168 return(error);
169 }
170
171 int
172 xfs_attr_get(
173 xfs_inode_t *ip,
174 const char *name,
175 char *value,
176 int *valuelenp,
177 int flags)
178 {
179 int error;
180 struct xfs_name xname;
181
182 XFS_STATS_INC(xs_attr_get);
183
184 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
185 return(EIO);
186
187 error = xfs_attr_name_to_xname(&xname, name);
188 if (error)
189 return error;
190
191 xfs_ilock(ip, XFS_ILOCK_SHARED);
192 error = xfs_attr_get_int(ip, &xname, value, valuelenp, flags);
193 xfs_iunlock(ip, XFS_ILOCK_SHARED);
194 return(error);
195 }
196
197 /*
198 * Calculate how many blocks we need for the new attribute,
199 */
200 int
201 xfs_attr_calc_size(
202 struct xfs_inode *ip,
203 int namelen,
204 int valuelen,
205 int *local)
206 {
207 struct xfs_mount *mp = ip->i_mount;
208 int size;
209 int nblks;
210
211 /*
212 * Determine space new attribute will use, and if it would be
213 * "local" or "remote" (note: local != inline).
214 */
215 size = xfs_attr_leaf_newentsize(namelen, valuelen,
216 mp->m_sb.sb_blocksize, local);
217
218 nblks = XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK);
219 if (*local) {
220 if (size > (mp->m_sb.sb_blocksize >> 1)) {
221 /* Double split possible */
222 nblks *= 2;
223 }
224 } else {
225 /*
226 * Out of line attribute, cannot double split, but
227 * make room for the attribute value itself.
228 */
229 uint dblocks = XFS_B_TO_FSB(mp, valuelen);
230 nblks += dblocks;
231 nblks += XFS_NEXTENTADD_SPACE_RES(mp, dblocks, XFS_ATTR_FORK);
232 }
233
234 return nblks;
235 }
236
237 STATIC int
238 xfs_attr_set_int(xfs_inode_t *dp, struct xfs_name *name,
239 char *value, int valuelen, int flags)
240 {
241 xfs_da_args_t args;
242 xfs_fsblock_t firstblock;
243 xfs_bmap_free_t flist;
244 int error, err2, committed;
245 xfs_mount_t *mp = dp->i_mount;
246 int rsvd = (flags & ATTR_ROOT) != 0;
247 int local;
248
249 /*
250 * Attach the dquots to the inode.
251 */
252 error = xfs_qm_dqattach(dp, 0);
253 if (error)
254 return error;
255
256 /*
257 * If the inode doesn't have an attribute fork, add one.
258 * (inode must not be locked when we call this routine)
259 */
260 if (XFS_IFORK_Q(dp) == 0) {
261 int sf_size = sizeof(xfs_attr_sf_hdr_t) +
262 XFS_ATTR_SF_ENTSIZE_BYNAME(name->len, valuelen);
263
264 if ((error = xfs_bmap_add_attrfork(dp, sf_size, rsvd)))
265 return(error);
266 }
267
268 /*
269 * Fill in the arg structure for this request.
270 */
271 memset((char *)&args, 0, sizeof(args));
272 args.name = name->name;
273 args.namelen = name->len;
274 args.value = value;
275 args.valuelen = valuelen;
276 args.flags = flags;
277 args.hashval = xfs_da_hashname(args.name, args.namelen);
278 args.dp = dp;
279 args.firstblock = &firstblock;
280 args.flist = &flist;
281 args.whichfork = XFS_ATTR_FORK;
282 args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
283
284 /* Size is now blocks for attribute data */
285 args.total = xfs_attr_calc_size(dp, name->len, valuelen, &local);
286
287 /*
288 * Start our first transaction of the day.
289 *
290 * All future transactions during this code must be "chained" off
291 * this one via the trans_dup() call. All transactions will contain
292 * the inode, and the inode will always be marked with trans_ihold().
293 * Since the inode will be locked in all transactions, we must log
294 * the inode in every transaction to let it float upward through
295 * the log.
296 */
297 args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_SET);
298
299 /*
300 * Root fork attributes can use reserved data blocks for this
301 * operation if necessary
302 */
303
304 if (rsvd)
305 args.trans->t_flags |= XFS_TRANS_RESERVE;
306
307 if ((error = xfs_trans_reserve(args.trans, args.total,
308 XFS_ATTRSET_LOG_RES(mp, args.total), 0,
309 XFS_TRANS_PERM_LOG_RES, XFS_ATTRSET_LOG_COUNT))) {
310 xfs_trans_cancel(args.trans, 0);
311 return(error);
312 }
313 xfs_ilock(dp, XFS_ILOCK_EXCL);
314
315 error = xfs_trans_reserve_quota_nblks(args.trans, dp, args.total, 0,
316 rsvd ? XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
317 XFS_QMOPT_RES_REGBLKS);
318 if (error) {
319 xfs_iunlock(dp, XFS_ILOCK_EXCL);
320 xfs_trans_cancel(args.trans, XFS_TRANS_RELEASE_LOG_RES);
321 return (error);
322 }
323
324 xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
325 xfs_trans_ihold(args.trans, dp);
326
327 /*
328 * If the attribute list is non-existent or a shortform list,
329 * upgrade it to a single-leaf-block attribute list.
330 */
331 if ((dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
332 ((dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS) &&
333 (dp->i_d.di_anextents == 0))) {
334
335 /*
336 * Build initial attribute list (if required).
337 */
338 if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS)
339 xfs_attr_shortform_create(&args);
340
341 /*
342 * Try to add the attr to the attribute list in
343 * the inode.
344 */
345 error = xfs_attr_shortform_addname(&args);
346 if (error != ENOSPC) {
347 /*
348 * Commit the shortform mods, and we're done.
349 * NOTE: this is also the error path (EEXIST, etc).
350 */
351 ASSERT(args.trans != NULL);
352
353 /*
354 * If this is a synchronous mount, make sure that
355 * the transaction goes to disk before returning
356 * to the user.
357 */
358 if (mp->m_flags & XFS_MOUNT_WSYNC) {
359 xfs_trans_set_sync(args.trans);
360 }
361 err2 = xfs_trans_commit(args.trans,
362 XFS_TRANS_RELEASE_LOG_RES);
363 xfs_iunlock(dp, XFS_ILOCK_EXCL);
364
365 /*
366 * Hit the inode change time.
367 */
368 if (!error && (flags & ATTR_KERNOTIME) == 0) {
369 xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
370 }
371 return(error == 0 ? err2 : error);
372 }
373
374 /*
375 * It won't fit in the shortform, transform to a leaf block.
376 * GROT: another possible req'mt for a double-split btree op.
377 */
378 xfs_bmap_init(args.flist, args.firstblock);
379 error = xfs_attr_shortform_to_leaf(&args);
380 if (!error) {
381 error = xfs_bmap_finish(&args.trans, args.flist,
382 &committed);
383 }
384 if (error) {
385 ASSERT(committed);
386 args.trans = NULL;
387 xfs_bmap_cancel(&flist);
388 goto out;
389 }
390
391 /*
392 * bmap_finish() may have committed the last trans and started
393 * a new one. We need the inode to be in all transactions.
394 */
395 if (committed) {
396 xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
397 xfs_trans_ihold(args.trans, dp);
398 }
399
400 /*
401 * Commit the leaf transformation. We'll need another (linked)
402 * transaction to add the new attribute to the leaf.
403 */
404
405 error = xfs_trans_roll(&args.trans, dp);
406 if (error)
407 goto out;
408
409 }
410
411 if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
412 error = xfs_attr_leaf_addname(&args);
413 } else {
414 error = xfs_attr_node_addname(&args);
415 }
416 if (error) {
417 goto out;
418 }
419
420 /*
421 * If this is a synchronous mount, make sure that the
422 * transaction goes to disk before returning to the user.
423 */
424 if (mp->m_flags & XFS_MOUNT_WSYNC) {
425 xfs_trans_set_sync(args.trans);
426 }
427
428 /*
429 * Commit the last in the sequence of transactions.
430 */
431 xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
432 error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES);
433 xfs_iunlock(dp, XFS_ILOCK_EXCL);
434
435 /*
436 * Hit the inode change time.
437 */
438 if (!error && (flags & ATTR_KERNOTIME) == 0) {
439 xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
440 }
441
442 return(error);
443
444 out:
445 if (args.trans)
446 xfs_trans_cancel(args.trans,
447 XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
448 xfs_iunlock(dp, XFS_ILOCK_EXCL);
449 return(error);
450 }
451
452 int
453 xfs_attr_set(
454 xfs_inode_t *dp,
455 const char *name,
456 char *value,
457 int valuelen,
458 int flags)
459 {
460 int error;
461 struct xfs_name xname;
462
463 XFS_STATS_INC(xs_attr_set);
464
465 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
466 return (EIO);
467
468 error = xfs_attr_name_to_xname(&xname, name);
469 if (error)
470 return error;
471
472 return xfs_attr_set_int(dp, &xname, value, valuelen, flags);
473 }
474
475 /*
476 * Generic handler routine to remove a name from an attribute list.
477 * Transitions attribute list from Btree to shortform as necessary.
478 */
479 STATIC int
480 xfs_attr_remove_int(xfs_inode_t *dp, struct xfs_name *name, int flags)
481 {
482 xfs_da_args_t args;
483 xfs_fsblock_t firstblock;
484 xfs_bmap_free_t flist;
485 int error;
486 xfs_mount_t *mp = dp->i_mount;
487
488 /*
489 * Fill in the arg structure for this request.
490 */
491 memset((char *)&args, 0, sizeof(args));
492 args.name = name->name;
493 args.namelen = name->len;
494 args.flags = flags;
495 args.hashval = xfs_da_hashname(args.name, args.namelen);
496 args.dp = dp;
497 args.firstblock = &firstblock;
498 args.flist = &flist;
499 args.total = 0;
500 args.whichfork = XFS_ATTR_FORK;
501
502 /*
503 * Attach the dquots to the inode.
504 */
505 error = xfs_qm_dqattach(dp, 0);
506 if (error)
507 return error;
508
509 /*
510 * Start our first transaction of the day.
511 *
512 * All future transactions during this code must be "chained" off
513 * this one via the trans_dup() call. All transactions will contain
514 * the inode, and the inode will always be marked with trans_ihold().
515 * Since the inode will be locked in all transactions, we must log
516 * the inode in every transaction to let it float upward through
517 * the log.
518 */
519 args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_RM);
520
521 /*
522 * Root fork attributes can use reserved data blocks for this
523 * operation if necessary
524 */
525
526 if (flags & ATTR_ROOT)
527 args.trans->t_flags |= XFS_TRANS_RESERVE;
528
529 if ((error = xfs_trans_reserve(args.trans,
530 XFS_ATTRRM_SPACE_RES(mp),
531 XFS_ATTRRM_LOG_RES(mp),
532 0, XFS_TRANS_PERM_LOG_RES,
533 XFS_ATTRRM_LOG_COUNT))) {
534 xfs_trans_cancel(args.trans, 0);
535 return(error);
536 }
537
538 xfs_ilock(dp, XFS_ILOCK_EXCL);
539 /*
540 * No need to make quota reservations here. We expect to release some
541 * blocks not allocate in the common case.
542 */
543 xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
544 xfs_trans_ihold(args.trans, dp);
545
546 /*
547 * Decide on what work routines to call based on the inode size.
548 */
549 if (!xfs_inode_hasattr(dp)) {
550 error = XFS_ERROR(ENOATTR);
551 goto out;
552 }
553 if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
554 ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
555 error = xfs_attr_shortform_remove(&args);
556 if (error) {
557 goto out;
558 }
559 } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
560 error = xfs_attr_leaf_removename(&args);
561 } else {
562 error = xfs_attr_node_removename(&args);
563 }
564 if (error) {
565 goto out;
566 }
567
568 /*
569 * If this is a synchronous mount, make sure that the
570 * transaction goes to disk before returning to the user.
571 */
572 if (mp->m_flags & XFS_MOUNT_WSYNC) {
573 xfs_trans_set_sync(args.trans);
574 }
575
576 /*
577 * Commit the last in the sequence of transactions.
578 */
579 xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
580 error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES);
581 xfs_iunlock(dp, XFS_ILOCK_EXCL);
582
583 /*
584 * Hit the inode change time.
585 */
586 if (!error && (flags & ATTR_KERNOTIME) == 0) {
587 xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
588 }
589
590 return(error);
591
592 out:
593 if (args.trans)
594 xfs_trans_cancel(args.trans,
595 XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
596 xfs_iunlock(dp, XFS_ILOCK_EXCL);
597 return(error);
598 }
599
600 int
601 xfs_attr_remove(
602 xfs_inode_t *dp,
603 const char *name,
604 int flags)
605 {
606 int error;
607 struct xfs_name xname;
608
609 XFS_STATS_INC(xs_attr_remove);
610
611 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
612 return (EIO);
613
614 error = xfs_attr_name_to_xname(&xname, name);
615 if (error)
616 return error;
617
618 xfs_ilock(dp, XFS_ILOCK_SHARED);
619 if (!xfs_inode_hasattr(dp)) {
620 xfs_iunlock(dp, XFS_ILOCK_SHARED);
621 return XFS_ERROR(ENOATTR);
622 }
623 xfs_iunlock(dp, XFS_ILOCK_SHARED);
624
625 return xfs_attr_remove_int(dp, &xname, flags);
626 }
627
628 int
629 xfs_attr_list_int(xfs_attr_list_context_t *context)
630 {
631 int error;
632 xfs_inode_t *dp = context->dp;
633
634 XFS_STATS_INC(xs_attr_list);
635
636 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
637 return EIO;
638
639 xfs_ilock(dp, XFS_ILOCK_SHARED);
640
641 /*
642 * Decide on what work routines to call based on the inode size.
643 */
644 if (!xfs_inode_hasattr(dp)) {
645 error = 0;
646 } else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
647 error = xfs_attr_shortform_list(context);
648 } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
649 error = xfs_attr_leaf_list(context);
650 } else {
651 error = xfs_attr_node_list(context);
652 }
653
654 xfs_iunlock(dp, XFS_ILOCK_SHARED);
655
656 return error;
657 }
658
659 #define ATTR_ENTBASESIZE /* minimum bytes used by an attr */ \
660 (((struct attrlist_ent *) 0)->a_name - (char *) 0)
661 #define ATTR_ENTSIZE(namelen) /* actual bytes used by an attr */ \
662 ((ATTR_ENTBASESIZE + (namelen) + 1 + sizeof(u_int32_t)-1) \
663 & ~(sizeof(u_int32_t)-1))
664
665 /*
666 * Format an attribute and copy it out to the user's buffer.
667 * Take care to check values and protect against them changing later,
668 * we may be reading them directly out of a user buffer.
669 */
670 /*ARGSUSED*/
671 STATIC int
672 xfs_attr_put_listent(xfs_attr_list_context_t *context, int flags,
673 char *name, int namelen,
674 int valuelen, char *value)
675 {
676 struct attrlist *alist = (struct attrlist *)context->alist;
677 attrlist_ent_t *aep;
678 int arraytop;
679
680 ASSERT(!(context->flags & ATTR_KERNOVAL));
681 ASSERT(context->count >= 0);
682 ASSERT(context->count < (ATTR_MAX_VALUELEN/8));
683 ASSERT(context->firstu >= sizeof(*alist));
684 ASSERT(context->firstu <= context->bufsize);
685
686 /*
687 * Only list entries in the right namespace.
688 */
689 if (((context->flags & ATTR_SECURE) == 0) !=
690 ((flags & XFS_ATTR_SECURE) == 0))
691 return 0;
692 if (((context->flags & ATTR_ROOT) == 0) !=
693 ((flags & XFS_ATTR_ROOT) == 0))
694 return 0;
695
696 arraytop = sizeof(*alist) +
697 context->count * sizeof(alist->al_offset[0]);
698 context->firstu -= ATTR_ENTSIZE(namelen);
699 if (context->firstu < arraytop) {
700 trace_xfs_attr_list_full(context);
701 alist->al_more = 1;
702 context->seen_enough = 1;
703 return 1;
704 }
705
706 aep = (attrlist_ent_t *)&context->alist[context->firstu];
707 aep->a_valuelen = valuelen;
708 memcpy(aep->a_name, name, namelen);
709 aep->a_name[namelen] = 0;
710 alist->al_offset[context->count++] = context->firstu;
711 alist->al_count = context->count;
712 trace_xfs_attr_list_add(context);
713 return 0;
714 }
715
716 /*
717 * Generate a list of extended attribute names and optionally
718 * also value lengths. Positive return value follows the XFS
719 * convention of being an error, zero or negative return code
720 * is the length of the buffer returned (negated), indicating
721 * success.
722 */
723 int
724 xfs_attr_list(
725 xfs_inode_t *dp,
726 char *buffer,
727 int bufsize,
728 int flags,
729 attrlist_cursor_kern_t *cursor)
730 {
731 xfs_attr_list_context_t context;
732 struct attrlist *alist;
733 int error;
734
735 /*
736 * Validate the cursor.
737 */
738 if (cursor->pad1 || cursor->pad2)
739 return(XFS_ERROR(EINVAL));
740 if ((cursor->initted == 0) &&
741 (cursor->hashval || cursor->blkno || cursor->offset))
742 return XFS_ERROR(EINVAL);
743
744 /*
745 * Check for a properly aligned buffer.
746 */
747 if (((long)buffer) & (sizeof(int)-1))
748 return XFS_ERROR(EFAULT);
749 if (flags & ATTR_KERNOVAL)
750 bufsize = 0;
751
752 /*
753 * Initialize the output buffer.
754 */
755 memset(&context, 0, sizeof(context));
756 context.dp = dp;
757 context.cursor = cursor;
758 context.resynch = 1;
759 context.flags = flags;
760 context.alist = buffer;
761 context.bufsize = (bufsize & ~(sizeof(int)-1)); /* align */
762 context.firstu = context.bufsize;
763 context.put_listent = xfs_attr_put_listent;
764
765 alist = (struct attrlist *)context.alist;
766 alist->al_count = 0;
767 alist->al_more = 0;
768 alist->al_offset[0] = context.bufsize;
769
770 error = xfs_attr_list_int(&context);
771 ASSERT(error >= 0);
772 return error;
773 }
774
775 int /* error */
776 xfs_attr_inactive(xfs_inode_t *dp)
777 {
778 xfs_trans_t *trans;
779 xfs_mount_t *mp;
780 int error;
781
782 mp = dp->i_mount;
783 ASSERT(! XFS_NOT_DQATTACHED(mp, dp));
784
785 xfs_ilock(dp, XFS_ILOCK_SHARED);
786 if (!xfs_inode_hasattr(dp) ||
787 dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
788 xfs_iunlock(dp, XFS_ILOCK_SHARED);
789 return 0;
790 }
791 xfs_iunlock(dp, XFS_ILOCK_SHARED);
792
793 /*
794 * Start our first transaction of the day.
795 *
796 * All future transactions during this code must be "chained" off
797 * this one via the trans_dup() call. All transactions will contain
798 * the inode, and the inode will always be marked with trans_ihold().
799 * Since the inode will be locked in all transactions, we must log
800 * the inode in every transaction to let it float upward through
801 * the log.
802 */
803 trans = xfs_trans_alloc(mp, XFS_TRANS_ATTRINVAL);
804 if ((error = xfs_trans_reserve(trans, 0, XFS_ATTRINVAL_LOG_RES(mp), 0,
805 XFS_TRANS_PERM_LOG_RES,
806 XFS_ATTRINVAL_LOG_COUNT))) {
807 xfs_trans_cancel(trans, 0);
808 return(error);
809 }
810 xfs_ilock(dp, XFS_ILOCK_EXCL);
811
812 /*
813 * No need to make quota reservations here. We expect to release some
814 * blocks, not allocate, in the common case.
815 */
816 xfs_trans_ijoin(trans, dp, XFS_ILOCK_EXCL);
817 xfs_trans_ihold(trans, dp);
818
819 /*
820 * Decide on what work routines to call based on the inode size.
821 */
822 if (!xfs_inode_hasattr(dp) ||
823 dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
824 error = 0;
825 goto out;
826 }
827 error = xfs_attr_root_inactive(&trans, dp);
828 if (error)
829 goto out;
830 /*
831 * signal synchronous inactive transactions unless this
832 * is a synchronous mount filesystem in which case we
833 * know that we're here because we've been called out of
834 * xfs_inactive which means that the last reference is gone
835 * and the unlink transaction has already hit the disk so
836 * async inactive transactions are safe.
837 */
838 if ((error = xfs_itruncate_finish(&trans, dp, 0LL, XFS_ATTR_FORK,
839 (!(mp->m_flags & XFS_MOUNT_WSYNC)
840 ? 1 : 0))))
841 goto out;
842
843 /*
844 * Commit the last in the sequence of transactions.
845 */
846 xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
847 error = xfs_trans_commit(trans, XFS_TRANS_RELEASE_LOG_RES);
848 xfs_iunlock(dp, XFS_ILOCK_EXCL);
849
850 return(error);
851
852 out:
853 xfs_trans_cancel(trans, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
854 xfs_iunlock(dp, XFS_ILOCK_EXCL);
855 return(error);
856 }
857
858
859
860 /*========================================================================
861 * External routines when attribute list is inside the inode
862 *========================================================================*/
863
864 /*
865 * Add a name to the shortform attribute list structure
866 * This is the external routine.
867 */
868 STATIC int
869 xfs_attr_shortform_addname(xfs_da_args_t *args)
870 {
871 int newsize, forkoff, retval;
872
873 retval = xfs_attr_shortform_lookup(args);
874 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
875 return(retval);
876 } else if (retval == EEXIST) {
877 if (args->flags & ATTR_CREATE)
878 return(retval);
879 retval = xfs_attr_shortform_remove(args);
880 ASSERT(retval == 0);
881 }
882
883 if (args->namelen >= XFS_ATTR_SF_ENTSIZE_MAX ||
884 args->valuelen >= XFS_ATTR_SF_ENTSIZE_MAX)
885 return(XFS_ERROR(ENOSPC));
886
887 newsize = XFS_ATTR_SF_TOTSIZE(args->dp);
888 newsize += XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
889
890 forkoff = xfs_attr_shortform_bytesfit(args->dp, newsize);
891 if (!forkoff)
892 return(XFS_ERROR(ENOSPC));
893
894 xfs_attr_shortform_add(args, forkoff);
895 return(0);
896 }
897
898
899 /*========================================================================
900 * External routines when attribute list is one block
901 *========================================================================*/
902
903 /*
904 * Add a name to the leaf attribute list structure
905 *
906 * This leaf block cannot have a "remote" value, we only call this routine
907 * if bmap_one_block() says there is only one block (ie: no remote blks).
908 */
909 STATIC int
910 xfs_attr_leaf_addname(xfs_da_args_t *args)
911 {
912 xfs_inode_t *dp;
913 xfs_dabuf_t *bp;
914 int retval, error, committed, forkoff;
915
916 /*
917 * Read the (only) block in the attribute list in.
918 */
919 dp = args->dp;
920 args->blkno = 0;
921 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
922 XFS_ATTR_FORK);
923 if (error)
924 return(error);
925 ASSERT(bp != NULL);
926
927 /*
928 * Look up the given attribute in the leaf block. Figure out if
929 * the given flags produce an error or call for an atomic rename.
930 */
931 retval = xfs_attr_leaf_lookup_int(bp, args);
932 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
933 xfs_da_brelse(args->trans, bp);
934 return(retval);
935 } else if (retval == EEXIST) {
936 if (args->flags & ATTR_CREATE) { /* pure create op */
937 xfs_da_brelse(args->trans, bp);
938 return(retval);
939 }
940 args->op_flags |= XFS_DA_OP_RENAME; /* an atomic rename */
941 args->blkno2 = args->blkno; /* set 2nd entry info*/
942 args->index2 = args->index;
943 args->rmtblkno2 = args->rmtblkno;
944 args->rmtblkcnt2 = args->rmtblkcnt;
945 }
946
947 /*
948 * Add the attribute to the leaf block, transitioning to a Btree
949 * if required.
950 */
951 retval = xfs_attr_leaf_add(bp, args);
952 xfs_da_buf_done(bp);
953 if (retval == ENOSPC) {
954 /*
955 * Promote the attribute list to the Btree format, then
956 * Commit that transaction so that the node_addname() call
957 * can manage its own transactions.
958 */
959 xfs_bmap_init(args->flist, args->firstblock);
960 error = xfs_attr_leaf_to_node(args);
961 if (!error) {
962 error = xfs_bmap_finish(&args->trans, args->flist,
963 &committed);
964 }
965 if (error) {
966 ASSERT(committed);
967 args->trans = NULL;
968 xfs_bmap_cancel(args->flist);
969 return(error);
970 }
971
972 /*
973 * bmap_finish() may have committed the last trans and started
974 * a new one. We need the inode to be in all transactions.
975 */
976 if (committed) {
977 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
978 xfs_trans_ihold(args->trans, dp);
979 }
980
981 /*
982 * Commit the current trans (including the inode) and start
983 * a new one.
984 */
985 error = xfs_trans_roll(&args->trans, dp);
986 if (error)
987 return (error);
988
989 /*
990 * Fob the whole rest of the problem off on the Btree code.
991 */
992 error = xfs_attr_node_addname(args);
993 return(error);
994 }
995
996 /*
997 * Commit the transaction that added the attr name so that
998 * later routines can manage their own transactions.
999 */
1000 error = xfs_trans_roll(&args->trans, dp);
1001 if (error)
1002 return (error);
1003
1004 /*
1005 * If there was an out-of-line value, allocate the blocks we
1006 * identified for its storage and copy the value. This is done
1007 * after we create the attribute so that we don't overflow the
1008 * maximum size of a transaction and/or hit a deadlock.
1009 */
1010 if (args->rmtblkno > 0) {
1011 error = xfs_attr_rmtval_set(args);
1012 if (error)
1013 return(error);
1014 }
1015
1016 /*
1017 * If this is an atomic rename operation, we must "flip" the
1018 * incomplete flags on the "new" and "old" attribute/value pairs
1019 * so that one disappears and one appears atomically. Then we
1020 * must remove the "old" attribute/value pair.
1021 */
1022 if (args->op_flags & XFS_DA_OP_RENAME) {
1023 /*
1024 * In a separate transaction, set the incomplete flag on the
1025 * "old" attr and clear the incomplete flag on the "new" attr.
1026 */
1027 error = xfs_attr_leaf_flipflags(args);
1028 if (error)
1029 return(error);
1030
1031 /*
1032 * Dismantle the "old" attribute/value pair by removing
1033 * a "remote" value (if it exists).
1034 */
1035 args->index = args->index2;
1036 args->blkno = args->blkno2;
1037 args->rmtblkno = args->rmtblkno2;
1038 args->rmtblkcnt = args->rmtblkcnt2;
1039 if (args->rmtblkno) {
1040 error = xfs_attr_rmtval_remove(args);
1041 if (error)
1042 return(error);
1043 }
1044
1045 /*
1046 * Read in the block containing the "old" attr, then
1047 * remove the "old" attr from that block (neat, huh!)
1048 */
1049 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1,
1050 &bp, XFS_ATTR_FORK);
1051 if (error)
1052 return(error);
1053 ASSERT(bp != NULL);
1054 (void)xfs_attr_leaf_remove(bp, args);
1055
1056 /*
1057 * If the result is small enough, shrink it all into the inode.
1058 */
1059 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1060 xfs_bmap_init(args->flist, args->firstblock);
1061 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1062 /* bp is gone due to xfs_da_shrink_inode */
1063 if (!error) {
1064 error = xfs_bmap_finish(&args->trans,
1065 args->flist,
1066 &committed);
1067 }
1068 if (error) {
1069 ASSERT(committed);
1070 args->trans = NULL;
1071 xfs_bmap_cancel(args->flist);
1072 return(error);
1073 }
1074
1075 /*
1076 * bmap_finish() may have committed the last trans
1077 * and started a new one. We need the inode to be
1078 * in all transactions.
1079 */
1080 if (committed) {
1081 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1082 xfs_trans_ihold(args->trans, dp);
1083 }
1084 } else
1085 xfs_da_buf_done(bp);
1086
1087 /*
1088 * Commit the remove and start the next trans in series.
1089 */
1090 error = xfs_trans_roll(&args->trans, dp);
1091
1092 } else if (args->rmtblkno > 0) {
1093 /*
1094 * Added a "remote" value, just clear the incomplete flag.
1095 */
1096 error = xfs_attr_leaf_clearflag(args);
1097 }
1098 return(error);
1099 }
1100
1101 /*
1102 * Remove a name from the leaf attribute list structure
1103 *
1104 * This leaf block cannot have a "remote" value, we only call this routine
1105 * if bmap_one_block() says there is only one block (ie: no remote blks).
1106 */
1107 STATIC int
1108 xfs_attr_leaf_removename(xfs_da_args_t *args)
1109 {
1110 xfs_inode_t *dp;
1111 xfs_dabuf_t *bp;
1112 int error, committed, forkoff;
1113
1114 /*
1115 * Remove the attribute.
1116 */
1117 dp = args->dp;
1118 args->blkno = 0;
1119 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
1120 XFS_ATTR_FORK);
1121 if (error) {
1122 return(error);
1123 }
1124
1125 ASSERT(bp != NULL);
1126 error = xfs_attr_leaf_lookup_int(bp, args);
1127 if (error == ENOATTR) {
1128 xfs_da_brelse(args->trans, bp);
1129 return(error);
1130 }
1131
1132 (void)xfs_attr_leaf_remove(bp, args);
1133
1134 /*
1135 * If the result is small enough, shrink it all into the inode.
1136 */
1137 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1138 xfs_bmap_init(args->flist, args->firstblock);
1139 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1140 /* bp is gone due to xfs_da_shrink_inode */
1141 if (!error) {
1142 error = xfs_bmap_finish(&args->trans, args->flist,
1143 &committed);
1144 }
1145 if (error) {
1146 ASSERT(committed);
1147 args->trans = NULL;
1148 xfs_bmap_cancel(args->flist);
1149 return(error);
1150 }
1151
1152 /*
1153 * bmap_finish() may have committed the last trans and started
1154 * a new one. We need the inode to be in all transactions.
1155 */
1156 if (committed) {
1157 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1158 xfs_trans_ihold(args->trans, dp);
1159 }
1160 } else
1161 xfs_da_buf_done(bp);
1162 return(0);
1163 }
1164
1165 /*
1166 * Look up a name in a leaf attribute list structure.
1167 *
1168 * This leaf block cannot have a "remote" value, we only call this routine
1169 * if bmap_one_block() says there is only one block (ie: no remote blks).
1170 */
1171 STATIC int
1172 xfs_attr_leaf_get(xfs_da_args_t *args)
1173 {
1174 xfs_dabuf_t *bp;
1175 int error;
1176
1177 args->blkno = 0;
1178 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
1179 XFS_ATTR_FORK);
1180 if (error)
1181 return(error);
1182 ASSERT(bp != NULL);
1183
1184 error = xfs_attr_leaf_lookup_int(bp, args);
1185 if (error != EEXIST) {
1186 xfs_da_brelse(args->trans, bp);
1187 return(error);
1188 }
1189 error = xfs_attr_leaf_getvalue(bp, args);
1190 xfs_da_brelse(args->trans, bp);
1191 if (!error && (args->rmtblkno > 0) && !(args->flags & ATTR_KERNOVAL)) {
1192 error = xfs_attr_rmtval_get(args);
1193 }
1194 return(error);
1195 }
1196
1197 /*
1198 * Copy out attribute entries for attr_list(), for leaf attribute lists.
1199 */
1200 STATIC int
1201 xfs_attr_leaf_list(xfs_attr_list_context_t *context)
1202 {
1203 xfs_attr_leafblock_t *leaf;
1204 int error;
1205 xfs_dabuf_t *bp;
1206
1207 context->cursor->blkno = 0;
1208 error = xfs_da_read_buf(NULL, context->dp, 0, -1, &bp, XFS_ATTR_FORK);
1209 if (error)
1210 return XFS_ERROR(error);
1211 ASSERT(bp != NULL);
1212 leaf = bp->data;
1213 if (unlikely(be16_to_cpu(leaf->hdr.info.magic) != XFS_ATTR_LEAF_MAGIC)) {
1214 XFS_CORRUPTION_ERROR("xfs_attr_leaf_list", XFS_ERRLEVEL_LOW,
1215 context->dp->i_mount, leaf);
1216 xfs_da_brelse(NULL, bp);
1217 return XFS_ERROR(EFSCORRUPTED);
1218 }
1219
1220 error = xfs_attr_leaf_list_int(bp, context);
1221 xfs_da_brelse(NULL, bp);
1222 return XFS_ERROR(error);
1223 }
1224
1225
1226 /*========================================================================
1227 * External routines when attribute list size > XFS_LBSIZE(mp).
1228 *========================================================================*/
1229
1230 /*
1231 * Add a name to a Btree-format attribute list.
1232 *
1233 * This will involve walking down the Btree, and may involve splitting
1234 * leaf nodes and even splitting intermediate nodes up to and including
1235 * the root node (a special case of an intermediate node).
1236 *
1237 * "Remote" attribute values confuse the issue and atomic rename operations
1238 * add a whole extra layer of confusion on top of that.
1239 */
1240 STATIC int
1241 xfs_attr_node_addname(xfs_da_args_t *args)
1242 {
1243 xfs_da_state_t *state;
1244 xfs_da_state_blk_t *blk;
1245 xfs_inode_t *dp;
1246 xfs_mount_t *mp;
1247 int committed, retval, error;
1248
1249 /*
1250 * Fill in bucket of arguments/results/context to carry around.
1251 */
1252 dp = args->dp;
1253 mp = dp->i_mount;
1254 restart:
1255 state = xfs_da_state_alloc();
1256 state->args = args;
1257 state->mp = mp;
1258 state->blocksize = state->mp->m_sb.sb_blocksize;
1259 state->node_ents = state->mp->m_attr_node_ents;
1260
1261 /*
1262 * Search to see if name already exists, and get back a pointer
1263 * to where it should go.
1264 */
1265 error = xfs_da_node_lookup_int(state, &retval);
1266 if (error)
1267 goto out;
1268 blk = &state->path.blk[ state->path.active-1 ];
1269 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1270 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
1271 goto out;
1272 } else if (retval == EEXIST) {
1273 if (args->flags & ATTR_CREATE)
1274 goto out;
1275 args->op_flags |= XFS_DA_OP_RENAME; /* atomic rename op */
1276 args->blkno2 = args->blkno; /* set 2nd entry info*/
1277 args->index2 = args->index;
1278 args->rmtblkno2 = args->rmtblkno;
1279 args->rmtblkcnt2 = args->rmtblkcnt;
1280 args->rmtblkno = 0;
1281 args->rmtblkcnt = 0;
1282 }
1283
1284 retval = xfs_attr_leaf_add(blk->bp, state->args);
1285 if (retval == ENOSPC) {
1286 if (state->path.active == 1) {
1287 /*
1288 * Its really a single leaf node, but it had
1289 * out-of-line values so it looked like it *might*
1290 * have been a b-tree.
1291 */
1292 xfs_da_state_free(state);
1293 xfs_bmap_init(args->flist, args->firstblock);
1294 error = xfs_attr_leaf_to_node(args);
1295 if (!error) {
1296 error = xfs_bmap_finish(&args->trans,
1297 args->flist,
1298 &committed);
1299 }
1300 if (error) {
1301 ASSERT(committed);
1302 args->trans = NULL;
1303 xfs_bmap_cancel(args->flist);
1304 goto out;
1305 }
1306
1307 /*
1308 * bmap_finish() may have committed the last trans
1309 * and started a new one. We need the inode to be
1310 * in all transactions.
1311 */
1312 if (committed) {
1313 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1314 xfs_trans_ihold(args->trans, dp);
1315 }
1316
1317 /*
1318 * Commit the node conversion and start the next
1319 * trans in the chain.
1320 */
1321 error = xfs_trans_roll(&args->trans, dp);
1322 if (error)
1323 goto out;
1324
1325 goto restart;
1326 }
1327
1328 /*
1329 * Split as many Btree elements as required.
1330 * This code tracks the new and old attr's location
1331 * in the index/blkno/rmtblkno/rmtblkcnt fields and
1332 * in the index2/blkno2/rmtblkno2/rmtblkcnt2 fields.
1333 */
1334 xfs_bmap_init(args->flist, args->firstblock);
1335 error = xfs_da_split(state);
1336 if (!error) {
1337 error = xfs_bmap_finish(&args->trans, args->flist,
1338 &committed);
1339 }
1340 if (error) {
1341 ASSERT(committed);
1342 args->trans = NULL;
1343 xfs_bmap_cancel(args->flist);
1344 goto out;
1345 }
1346
1347 /*
1348 * bmap_finish() may have committed the last trans and started
1349 * a new one. We need the inode to be in all transactions.
1350 */
1351 if (committed) {
1352 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1353 xfs_trans_ihold(args->trans, dp);
1354 }
1355 } else {
1356 /*
1357 * Addition succeeded, update Btree hashvals.
1358 */
1359 xfs_da_fixhashpath(state, &state->path);
1360 }
1361
1362 /*
1363 * Kill the state structure, we're done with it and need to
1364 * allow the buffers to come back later.
1365 */
1366 xfs_da_state_free(state);
1367 state = NULL;
1368
1369 /*
1370 * Commit the leaf addition or btree split and start the next
1371 * trans in the chain.
1372 */
1373 error = xfs_trans_roll(&args->trans, dp);
1374 if (error)
1375 goto out;
1376
1377 /*
1378 * If there was an out-of-line value, allocate the blocks we
1379 * identified for its storage and copy the value. This is done
1380 * after we create the attribute so that we don't overflow the
1381 * maximum size of a transaction and/or hit a deadlock.
1382 */
1383 if (args->rmtblkno > 0) {
1384 error = xfs_attr_rmtval_set(args);
1385 if (error)
1386 return(error);
1387 }
1388
1389 /*
1390 * If this is an atomic rename operation, we must "flip" the
1391 * incomplete flags on the "new" and "old" attribute/value pairs
1392 * so that one disappears and one appears atomically. Then we
1393 * must remove the "old" attribute/value pair.
1394 */
1395 if (args->op_flags & XFS_DA_OP_RENAME) {
1396 /*
1397 * In a separate transaction, set the incomplete flag on the
1398 * "old" attr and clear the incomplete flag on the "new" attr.
1399 */
1400 error = xfs_attr_leaf_flipflags(args);
1401 if (error)
1402 goto out;
1403
1404 /*
1405 * Dismantle the "old" attribute/value pair by removing
1406 * a "remote" value (if it exists).
1407 */
1408 args->index = args->index2;
1409 args->blkno = args->blkno2;
1410 args->rmtblkno = args->rmtblkno2;
1411 args->rmtblkcnt = args->rmtblkcnt2;
1412 if (args->rmtblkno) {
1413 error = xfs_attr_rmtval_remove(args);
1414 if (error)
1415 return(error);
1416 }
1417
1418 /*
1419 * Re-find the "old" attribute entry after any split ops.
1420 * The INCOMPLETE flag means that we will find the "old"
1421 * attr, not the "new" one.
1422 */
1423 args->flags |= XFS_ATTR_INCOMPLETE;
1424 state = xfs_da_state_alloc();
1425 state->args = args;
1426 state->mp = mp;
1427 state->blocksize = state->mp->m_sb.sb_blocksize;
1428 state->node_ents = state->mp->m_attr_node_ents;
1429 state->inleaf = 0;
1430 error = xfs_da_node_lookup_int(state, &retval);
1431 if (error)
1432 goto out;
1433
1434 /*
1435 * Remove the name and update the hashvals in the tree.
1436 */
1437 blk = &state->path.blk[ state->path.active-1 ];
1438 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1439 error = xfs_attr_leaf_remove(blk->bp, args);
1440 xfs_da_fixhashpath(state, &state->path);
1441
1442 /*
1443 * Check to see if the tree needs to be collapsed.
1444 */
1445 if (retval && (state->path.active > 1)) {
1446 xfs_bmap_init(args->flist, args->firstblock);
1447 error = xfs_da_join(state);
1448 if (!error) {
1449 error = xfs_bmap_finish(&args->trans,
1450 args->flist,
1451 &committed);
1452 }
1453 if (error) {
1454 ASSERT(committed);
1455 args->trans = NULL;
1456 xfs_bmap_cancel(args->flist);
1457 goto out;
1458 }
1459
1460 /*
1461 * bmap_finish() may have committed the last trans
1462 * and started a new one. We need the inode to be
1463 * in all transactions.
1464 */
1465 if (committed) {
1466 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1467 xfs_trans_ihold(args->trans, dp);
1468 }
1469 }
1470
1471 /*
1472 * Commit and start the next trans in the chain.
1473 */
1474 error = xfs_trans_roll(&args->trans, dp);
1475 if (error)
1476 goto out;
1477
1478 } else if (args->rmtblkno > 0) {
1479 /*
1480 * Added a "remote" value, just clear the incomplete flag.
1481 */
1482 error = xfs_attr_leaf_clearflag(args);
1483 if (error)
1484 goto out;
1485 }
1486 retval = error = 0;
1487
1488 out:
1489 if (state)
1490 xfs_da_state_free(state);
1491 if (error)
1492 return(error);
1493 return(retval);
1494 }
1495
1496 /*
1497 * Remove a name from a B-tree attribute list.
1498 *
1499 * This will involve walking down the Btree, and may involve joining
1500 * leaf nodes and even joining intermediate nodes up to and including
1501 * the root node (a special case of an intermediate node).
1502 */
1503 STATIC int
1504 xfs_attr_node_removename(xfs_da_args_t *args)
1505 {
1506 xfs_da_state_t *state;
1507 xfs_da_state_blk_t *blk;
1508 xfs_inode_t *dp;
1509 xfs_dabuf_t *bp;
1510 int retval, error, committed, forkoff;
1511
1512 /*
1513 * Tie a string around our finger to remind us where we are.
1514 */
1515 dp = args->dp;
1516 state = xfs_da_state_alloc();
1517 state->args = args;
1518 state->mp = dp->i_mount;
1519 state->blocksize = state->mp->m_sb.sb_blocksize;
1520 state->node_ents = state->mp->m_attr_node_ents;
1521
1522 /*
1523 * Search to see if name exists, and get back a pointer to it.
1524 */
1525 error = xfs_da_node_lookup_int(state, &retval);
1526 if (error || (retval != EEXIST)) {
1527 if (error == 0)
1528 error = retval;
1529 goto out;
1530 }
1531
1532 /*
1533 * If there is an out-of-line value, de-allocate the blocks.
1534 * This is done before we remove the attribute so that we don't
1535 * overflow the maximum size of a transaction and/or hit a deadlock.
1536 */
1537 blk = &state->path.blk[ state->path.active-1 ];
1538 ASSERT(blk->bp != NULL);
1539 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1540 if (args->rmtblkno > 0) {
1541 /*
1542 * Fill in disk block numbers in the state structure
1543 * so that we can get the buffers back after we commit
1544 * several transactions in the following calls.
1545 */
1546 error = xfs_attr_fillstate(state);
1547 if (error)
1548 goto out;
1549
1550 /*
1551 * Mark the attribute as INCOMPLETE, then bunmapi() the
1552 * remote value.
1553 */
1554 error = xfs_attr_leaf_setflag(args);
1555 if (error)
1556 goto out;
1557 error = xfs_attr_rmtval_remove(args);
1558 if (error)
1559 goto out;
1560
1561 /*
1562 * Refill the state structure with buffers, the prior calls
1563 * released our buffers.
1564 */
1565 error = xfs_attr_refillstate(state);
1566 if (error)
1567 goto out;
1568 }
1569
1570 /*
1571 * Remove the name and update the hashvals in the tree.
1572 */
1573 blk = &state->path.blk[ state->path.active-1 ];
1574 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1575 retval = xfs_attr_leaf_remove(blk->bp, args);
1576 xfs_da_fixhashpath(state, &state->path);
1577
1578 /*
1579 * Check to see if the tree needs to be collapsed.
1580 */
1581 if (retval && (state->path.active > 1)) {
1582 xfs_bmap_init(args->flist, args->firstblock);
1583 error = xfs_da_join(state);
1584 if (!error) {
1585 error = xfs_bmap_finish(&args->trans, args->flist,
1586 &committed);
1587 }
1588 if (error) {
1589 ASSERT(committed);
1590 args->trans = NULL;
1591 xfs_bmap_cancel(args->flist);
1592 goto out;
1593 }
1594
1595 /*
1596 * bmap_finish() may have committed the last trans and started
1597 * a new one. We need the inode to be in all transactions.
1598 */
1599 if (committed) {
1600 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1601 xfs_trans_ihold(args->trans, dp);
1602 }
1603
1604 /*
1605 * Commit the Btree join operation and start a new trans.
1606 */
1607 error = xfs_trans_roll(&args->trans, dp);
1608 if (error)
1609 goto out;
1610 }
1611
1612 /*
1613 * If the result is small enough, push it all into the inode.
1614 */
1615 if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
1616 /*
1617 * Have to get rid of the copy of this dabuf in the state.
1618 */
1619 ASSERT(state->path.active == 1);
1620 ASSERT(state->path.blk[0].bp);
1621 xfs_da_buf_done(state->path.blk[0].bp);
1622 state->path.blk[0].bp = NULL;
1623
1624 error = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp,
1625 XFS_ATTR_FORK);
1626 if (error)
1627 goto out;
1628 ASSERT(be16_to_cpu(((xfs_attr_leafblock_t *)
1629 bp->data)->hdr.info.magic)
1630 == XFS_ATTR_LEAF_MAGIC);
1631
1632 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1633 xfs_bmap_init(args->flist, args->firstblock);
1634 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1635 /* bp is gone due to xfs_da_shrink_inode */
1636 if (!error) {
1637 error = xfs_bmap_finish(&args->trans,
1638 args->flist,
1639 &committed);
1640 }
1641 if (error) {
1642 ASSERT(committed);
1643 args->trans = NULL;
1644 xfs_bmap_cancel(args->flist);
1645 goto out;
1646 }
1647
1648 /*
1649 * bmap_finish() may have committed the last trans
1650 * and started a new one. We need the inode to be
1651 * in all transactions.
1652 */
1653 if (committed) {
1654 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1655 xfs_trans_ihold(args->trans, dp);
1656 }
1657 } else
1658 xfs_da_brelse(args->trans, bp);
1659 }
1660 error = 0;
1661
1662 out:
1663 xfs_da_state_free(state);
1664 return(error);
1665 }
1666
1667 /*
1668 * Fill in the disk block numbers in the state structure for the buffers
1669 * that are attached to the state structure.
1670 * This is done so that we can quickly reattach ourselves to those buffers
1671 * after some set of transaction commits have released these buffers.
1672 */
1673 STATIC int
1674 xfs_attr_fillstate(xfs_da_state_t *state)
1675 {
1676 xfs_da_state_path_t *path;
1677 xfs_da_state_blk_t *blk;
1678 int level;
1679
1680 /*
1681 * Roll down the "path" in the state structure, storing the on-disk
1682 * block number for those buffers in the "path".
1683 */
1684 path = &state->path;
1685 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1686 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1687 if (blk->bp) {
1688 blk->disk_blkno = xfs_da_blkno(blk->bp);
1689 xfs_da_buf_done(blk->bp);
1690 blk->bp = NULL;
1691 } else {
1692 blk->disk_blkno = 0;
1693 }
1694 }
1695
1696 /*
1697 * Roll down the "altpath" in the state structure, storing the on-disk
1698 * block number for those buffers in the "altpath".
1699 */
1700 path = &state->altpath;
1701 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1702 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1703 if (blk->bp) {
1704 blk->disk_blkno = xfs_da_blkno(blk->bp);
1705 xfs_da_buf_done(blk->bp);
1706 blk->bp = NULL;
1707 } else {
1708 blk->disk_blkno = 0;
1709 }
1710 }
1711
1712 return(0);
1713 }
1714
1715 /*
1716 * Reattach the buffers to the state structure based on the disk block
1717 * numbers stored in the state structure.
1718 * This is done after some set of transaction commits have released those
1719 * buffers from our grip.
1720 */
1721 STATIC int
1722 xfs_attr_refillstate(xfs_da_state_t *state)
1723 {
1724 xfs_da_state_path_t *path;
1725 xfs_da_state_blk_t *blk;
1726 int level, error;
1727
1728 /*
1729 * Roll down the "path" in the state structure, storing the on-disk
1730 * block number for those buffers in the "path".
1731 */
1732 path = &state->path;
1733 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1734 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1735 if (blk->disk_blkno) {
1736 error = xfs_da_read_buf(state->args->trans,
1737 state->args->dp,
1738 blk->blkno, blk->disk_blkno,
1739 &blk->bp, XFS_ATTR_FORK);
1740 if (error)
1741 return(error);
1742 } else {
1743 blk->bp = NULL;
1744 }
1745 }
1746
1747 /*
1748 * Roll down the "altpath" in the state structure, storing the on-disk
1749 * block number for those buffers in the "altpath".
1750 */
1751 path = &state->altpath;
1752 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1753 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1754 if (blk->disk_blkno) {
1755 error = xfs_da_read_buf(state->args->trans,
1756 state->args->dp,
1757 blk->blkno, blk->disk_blkno,
1758 &blk->bp, XFS_ATTR_FORK);
1759 if (error)
1760 return(error);
1761 } else {
1762 blk->bp = NULL;
1763 }
1764 }
1765
1766 return(0);
1767 }
1768
1769 /*
1770 * Look up a filename in a node attribute list.
1771 *
1772 * This routine gets called for any attribute fork that has more than one
1773 * block, ie: both true Btree attr lists and for single-leaf-blocks with
1774 * "remote" values taking up more blocks.
1775 */
1776 STATIC int
1777 xfs_attr_node_get(xfs_da_args_t *args)
1778 {
1779 xfs_da_state_t *state;
1780 xfs_da_state_blk_t *blk;
1781 int error, retval;
1782 int i;
1783
1784 state = xfs_da_state_alloc();
1785 state->args = args;
1786 state->mp = args->dp->i_mount;
1787 state->blocksize = state->mp->m_sb.sb_blocksize;
1788 state->node_ents = state->mp->m_attr_node_ents;
1789
1790 /*
1791 * Search to see if name exists, and get back a pointer to it.
1792 */
1793 error = xfs_da_node_lookup_int(state, &retval);
1794 if (error) {
1795 retval = error;
1796 } else if (retval == EEXIST) {
1797 blk = &state->path.blk[ state->path.active-1 ];
1798 ASSERT(blk->bp != NULL);
1799 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1800
1801 /*
1802 * Get the value, local or "remote"
1803 */
1804 retval = xfs_attr_leaf_getvalue(blk->bp, args);
1805 if (!retval && (args->rmtblkno > 0)
1806 && !(args->flags & ATTR_KERNOVAL)) {
1807 retval = xfs_attr_rmtval_get(args);
1808 }
1809 }
1810
1811 /*
1812 * If not in a transaction, we have to release all the buffers.
1813 */
1814 for (i = 0; i < state->path.active; i++) {
1815 xfs_da_brelse(args->trans, state->path.blk[i].bp);
1816 state->path.blk[i].bp = NULL;
1817 }
1818
1819 xfs_da_state_free(state);
1820 return(retval);
1821 }
1822
1823 STATIC int /* error */
1824 xfs_attr_node_list(xfs_attr_list_context_t *context)
1825 {
1826 attrlist_cursor_kern_t *cursor;
1827 xfs_attr_leafblock_t *leaf;
1828 xfs_da_intnode_t *node;
1829 xfs_da_node_entry_t *btree;
1830 int error, i;
1831 xfs_dabuf_t *bp;
1832
1833 cursor = context->cursor;
1834 cursor->initted = 1;
1835
1836 /*
1837 * Do all sorts of validation on the passed-in cursor structure.
1838 * If anything is amiss, ignore the cursor and look up the hashval
1839 * starting from the btree root.
1840 */
1841 bp = NULL;
1842 if (cursor->blkno > 0) {
1843 error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
1844 &bp, XFS_ATTR_FORK);
1845 if ((error != 0) && (error != EFSCORRUPTED))
1846 return(error);
1847 if (bp) {
1848 node = bp->data;
1849 switch (be16_to_cpu(node->hdr.info.magic)) {
1850 case XFS_DA_NODE_MAGIC:
1851 trace_xfs_attr_list_wrong_blk(context);
1852 xfs_da_brelse(NULL, bp);
1853 bp = NULL;
1854 break;
1855 case XFS_ATTR_LEAF_MAGIC:
1856 leaf = bp->data;
1857 if (cursor->hashval > be32_to_cpu(leaf->entries[
1858 be16_to_cpu(leaf->hdr.count)-1].hashval)) {
1859 trace_xfs_attr_list_wrong_blk(context);
1860 xfs_da_brelse(NULL, bp);
1861 bp = NULL;
1862 } else if (cursor->hashval <=
1863 be32_to_cpu(leaf->entries[0].hashval)) {
1864 trace_xfs_attr_list_wrong_blk(context);
1865 xfs_da_brelse(NULL, bp);
1866 bp = NULL;
1867 }
1868 break;
1869 default:
1870 trace_xfs_attr_list_wrong_blk(context);
1871 xfs_da_brelse(NULL, bp);
1872 bp = NULL;
1873 }
1874 }
1875 }
1876
1877 /*
1878 * We did not find what we expected given the cursor's contents,
1879 * so we start from the top and work down based on the hash value.
1880 * Note that start of node block is same as start of leaf block.
1881 */
1882 if (bp == NULL) {
1883 cursor->blkno = 0;
1884 for (;;) {
1885 error = xfs_da_read_buf(NULL, context->dp,
1886 cursor->blkno, -1, &bp,
1887 XFS_ATTR_FORK);
1888 if (error)
1889 return(error);
1890 if (unlikely(bp == NULL)) {
1891 XFS_ERROR_REPORT("xfs_attr_node_list(2)",
1892 XFS_ERRLEVEL_LOW,
1893 context->dp->i_mount);
1894 return(XFS_ERROR(EFSCORRUPTED));
1895 }
1896 node = bp->data;
1897 if (be16_to_cpu(node->hdr.info.magic)
1898 == XFS_ATTR_LEAF_MAGIC)
1899 break;
1900 if (unlikely(be16_to_cpu(node->hdr.info.magic)
1901 != XFS_DA_NODE_MAGIC)) {
1902 XFS_CORRUPTION_ERROR("xfs_attr_node_list(3)",
1903 XFS_ERRLEVEL_LOW,
1904 context->dp->i_mount,
1905 node);
1906 xfs_da_brelse(NULL, bp);
1907 return(XFS_ERROR(EFSCORRUPTED));
1908 }
1909 btree = node->btree;
1910 for (i = 0; i < be16_to_cpu(node->hdr.count);
1911 btree++, i++) {
1912 if (cursor->hashval
1913 <= be32_to_cpu(btree->hashval)) {
1914 cursor->blkno = be32_to_cpu(btree->before);
1915 trace_xfs_attr_list_node_descend(context,
1916 btree);
1917 break;
1918 }
1919 }
1920 if (i == be16_to_cpu(node->hdr.count)) {
1921 xfs_da_brelse(NULL, bp);
1922 return(0);
1923 }
1924 xfs_da_brelse(NULL, bp);
1925 }
1926 }
1927 ASSERT(bp != NULL);
1928
1929 /*
1930 * Roll upward through the blocks, processing each leaf block in
1931 * order. As long as there is space in the result buffer, keep
1932 * adding the information.
1933 */
1934 for (;;) {
1935 leaf = bp->data;
1936 if (unlikely(be16_to_cpu(leaf->hdr.info.magic)
1937 != XFS_ATTR_LEAF_MAGIC)) {
1938 XFS_CORRUPTION_ERROR("xfs_attr_node_list(4)",
1939 XFS_ERRLEVEL_LOW,
1940 context->dp->i_mount, leaf);
1941 xfs_da_brelse(NULL, bp);
1942 return(XFS_ERROR(EFSCORRUPTED));
1943 }
1944 error = xfs_attr_leaf_list_int(bp, context);
1945 if (error) {
1946 xfs_da_brelse(NULL, bp);
1947 return error;
1948 }
1949 if (context->seen_enough || leaf->hdr.info.forw == 0)
1950 break;
1951 cursor->blkno = be32_to_cpu(leaf->hdr.info.forw);
1952 xfs_da_brelse(NULL, bp);
1953 error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
1954 &bp, XFS_ATTR_FORK);
1955 if (error)
1956 return(error);
1957 if (unlikely((bp == NULL))) {
1958 XFS_ERROR_REPORT("xfs_attr_node_list(5)",
1959 XFS_ERRLEVEL_LOW,
1960 context->dp->i_mount);
1961 return(XFS_ERROR(EFSCORRUPTED));
1962 }
1963 }
1964 xfs_da_brelse(NULL, bp);
1965 return(0);
1966 }
1967
1968
1969 /*========================================================================
1970 * External routines for manipulating out-of-line attribute values.
1971 *========================================================================*/
1972
1973 /*
1974 * Read the value associated with an attribute from the out-of-line buffer
1975 * that we stored it in.
1976 */
1977 int
1978 xfs_attr_rmtval_get(xfs_da_args_t *args)
1979 {
1980 xfs_bmbt_irec_t map[ATTR_RMTVALUE_MAPSIZE];
1981 xfs_mount_t *mp;
1982 xfs_daddr_t dblkno;
1983 xfs_caddr_t dst;
1984 xfs_buf_t *bp;
1985 int nmap, error, tmp, valuelen, blkcnt, i;
1986 xfs_dablk_t lblkno;
1987
1988 ASSERT(!(args->flags & ATTR_KERNOVAL));
1989
1990 mp = args->dp->i_mount;
1991 dst = args->value;
1992 valuelen = args->valuelen;
1993 lblkno = args->rmtblkno;
1994 while (valuelen > 0) {
1995 nmap = ATTR_RMTVALUE_MAPSIZE;
1996 error = xfs_bmapi(args->trans, args->dp, (xfs_fileoff_t)lblkno,
1997 args->rmtblkcnt,
1998 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
1999 NULL, 0, map, &nmap, NULL, NULL);
2000 if (error)
2001 return(error);
2002 ASSERT(nmap >= 1);
2003
2004 for (i = 0; (i < nmap) && (valuelen > 0); i++) {
2005 ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) &&
2006 (map[i].br_startblock != HOLESTARTBLOCK));
2007 dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock);
2008 blkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
2009 error = xfs_read_buf(mp, mp->m_ddev_targp, dblkno,
2010 blkcnt,
2011 XFS_BUF_LOCK | XBF_DONT_BLOCK,
2012 &bp);
2013 if (error)
2014 return(error);
2015
2016 tmp = (valuelen < XFS_BUF_SIZE(bp))
2017 ? valuelen : XFS_BUF_SIZE(bp);
2018 xfs_biomove(bp, 0, tmp, dst, XFS_B_READ);
2019 xfs_buf_relse(bp);
2020 dst += tmp;
2021 valuelen -= tmp;
2022
2023 lblkno += map[i].br_blockcount;
2024 }
2025 }
2026 ASSERT(valuelen == 0);
2027 return(0);
2028 }
2029
2030 /*
2031 * Write the value associated with an attribute into the out-of-line buffer
2032 * that we have defined for it.
2033 */
2034 STATIC int
2035 xfs_attr_rmtval_set(xfs_da_args_t *args)
2036 {
2037 xfs_mount_t *mp;
2038 xfs_fileoff_t lfileoff;
2039 xfs_inode_t *dp;
2040 xfs_bmbt_irec_t map;
2041 xfs_daddr_t dblkno;
2042 xfs_caddr_t src;
2043 xfs_buf_t *bp;
2044 xfs_dablk_t lblkno;
2045 int blkcnt, valuelen, nmap, error, tmp, committed;
2046
2047 dp = args->dp;
2048 mp = dp->i_mount;
2049 src = args->value;
2050
2051 /*
2052 * Find a "hole" in the attribute address space large enough for
2053 * us to drop the new attribute's value into.
2054 */
2055 blkcnt = XFS_B_TO_FSB(mp, args->valuelen);
2056 lfileoff = 0;
2057 error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff,
2058 XFS_ATTR_FORK);
2059 if (error) {
2060 return(error);
2061 }
2062 args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff;
2063 args->rmtblkcnt = blkcnt;
2064
2065 /*
2066 * Roll through the "value", allocating blocks on disk as required.
2067 */
2068 while (blkcnt > 0) {
2069 /*
2070 * Allocate a single extent, up to the size of the value.
2071 */
2072 xfs_bmap_init(args->flist, args->firstblock);
2073 nmap = 1;
2074 error = xfs_bmapi(args->trans, dp, (xfs_fileoff_t)lblkno,
2075 blkcnt,
2076 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA |
2077 XFS_BMAPI_WRITE,
2078 args->firstblock, args->total, &map, &nmap,
2079 args->flist, NULL);
2080 if (!error) {
2081 error = xfs_bmap_finish(&args->trans, args->flist,
2082 &committed);
2083 }
2084 if (error) {
2085 ASSERT(committed);
2086 args->trans = NULL;
2087 xfs_bmap_cancel(args->flist);
2088 return(error);
2089 }
2090
2091 /*
2092 * bmap_finish() may have committed the last trans and started
2093 * a new one. We need the inode to be in all transactions.
2094 */
2095 if (committed) {
2096 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
2097 xfs_trans_ihold(args->trans, dp);
2098 }
2099
2100 ASSERT(nmap == 1);
2101 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2102 (map.br_startblock != HOLESTARTBLOCK));
2103 lblkno += map.br_blockcount;
2104 blkcnt -= map.br_blockcount;
2105
2106 /*
2107 * Start the next trans in the chain.
2108 */
2109 error = xfs_trans_roll(&args->trans, dp);
2110 if (error)
2111 return (error);
2112 }
2113
2114 /*
2115 * Roll through the "value", copying the attribute value to the
2116 * already-allocated blocks. Blocks are written synchronously
2117 * so that we can know they are all on disk before we turn off
2118 * the INCOMPLETE flag.
2119 */
2120 lblkno = args->rmtblkno;
2121 valuelen = args->valuelen;
2122 while (valuelen > 0) {
2123 /*
2124 * Try to remember where we decided to put the value.
2125 */
2126 xfs_bmap_init(args->flist, args->firstblock);
2127 nmap = 1;
2128 error = xfs_bmapi(NULL, dp, (xfs_fileoff_t)lblkno,
2129 args->rmtblkcnt,
2130 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2131 args->firstblock, 0, &map, &nmap,
2132 NULL, NULL);
2133 if (error) {
2134 return(error);
2135 }
2136 ASSERT(nmap == 1);
2137 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2138 (map.br_startblock != HOLESTARTBLOCK));
2139
2140 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
2141 blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
2142
2143 bp = xfs_buf_get(mp->m_ddev_targp, dblkno, blkcnt,
2144 XFS_BUF_LOCK | XBF_DONT_BLOCK);
2145 ASSERT(bp);
2146 ASSERT(!XFS_BUF_GETERROR(bp));
2147
2148 tmp = (valuelen < XFS_BUF_SIZE(bp)) ? valuelen :
2149 XFS_BUF_SIZE(bp);
2150 xfs_biomove(bp, 0, tmp, src, XFS_B_WRITE);
2151 if (tmp < XFS_BUF_SIZE(bp))
2152 xfs_biozero(bp, tmp, XFS_BUF_SIZE(bp) - tmp);
2153 if ((error = xfs_bwrite(mp, bp))) {/* GROT: NOTE: synchronous write */
2154 return (error);
2155 }
2156 src += tmp;
2157 valuelen -= tmp;
2158
2159 lblkno += map.br_blockcount;
2160 }
2161 ASSERT(valuelen == 0);
2162 return(0);
2163 }
2164
2165 /*
2166 * Remove the value associated with an attribute by deleting the
2167 * out-of-line buffer that it is stored on.
2168 */
2169 STATIC int
2170 xfs_attr_rmtval_remove(xfs_da_args_t *args)
2171 {
2172 xfs_mount_t *mp;
2173 xfs_bmbt_irec_t map;
2174 xfs_buf_t *bp;
2175 xfs_daddr_t dblkno;
2176 xfs_dablk_t lblkno;
2177 int valuelen, blkcnt, nmap, error, done, committed;
2178
2179 mp = args->dp->i_mount;
2180
2181 /*
2182 * Roll through the "value", invalidating the attribute value's
2183 * blocks.
2184 */
2185 lblkno = args->rmtblkno;
2186 valuelen = args->rmtblkcnt;
2187 while (valuelen > 0) {
2188 /*
2189 * Try to remember where we decided to put the value.
2190 */
2191 xfs_bmap_init(args->flist, args->firstblock);
2192 nmap = 1;
2193 error = xfs_bmapi(NULL, args->dp, (xfs_fileoff_t)lblkno,
2194 args->rmtblkcnt,
2195 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2196 args->firstblock, 0, &map, &nmap,
2197 args->flist, NULL);
2198 if (error) {
2199 return(error);
2200 }
2201 ASSERT(nmap == 1);
2202 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2203 (map.br_startblock != HOLESTARTBLOCK));
2204
2205 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
2206 blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
2207
2208 /*
2209 * If the "remote" value is in the cache, remove it.
2210 */
2211 bp = xfs_incore(mp->m_ddev_targp, dblkno, blkcnt,
2212 XFS_INCORE_TRYLOCK);
2213 if (bp) {
2214 XFS_BUF_STALE(bp);
2215 XFS_BUF_UNDELAYWRITE(bp);
2216 xfs_buf_relse(bp);
2217 bp = NULL;
2218 }
2219
2220 valuelen -= map.br_blockcount;
2221
2222 lblkno += map.br_blockcount;
2223 }
2224
2225 /*
2226 * Keep de-allocating extents until the remote-value region is gone.
2227 */
2228 lblkno = args->rmtblkno;
2229 blkcnt = args->rmtblkcnt;
2230 done = 0;
2231 while (!done) {
2232 xfs_bmap_init(args->flist, args->firstblock);
2233 error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt,
2234 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2235 1, args->firstblock, args->flist,
2236 NULL, &done);
2237 if (!error) {
2238 error = xfs_bmap_finish(&args->trans, args->flist,
2239 &committed);
2240 }
2241 if (error) {
2242 ASSERT(committed);
2243 args->trans = NULL;
2244 xfs_bmap_cancel(args->flist);
2245 return(error);
2246 }
2247
2248 /*
2249 * bmap_finish() may have committed the last trans and started
2250 * a new one. We need the inode to be in all transactions.
2251 */
2252 if (committed) {
2253 xfs_trans_ijoin(args->trans, args->dp, XFS_ILOCK_EXCL);
2254 xfs_trans_ihold(args->trans, args->dp);
2255 }
2256
2257 /*
2258 * Close out trans and start the next one in the chain.
2259 */
2260 error = xfs_trans_roll(&args->trans, args->dp);
2261 if (error)
2262 return (error);
2263 }
2264 return(0);
2265 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree