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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm
[wrt350n-kernel.git] / fs / xfs / xfs_attr.c
blob9d358ffce4e5101d999570b3af021be3705d797b
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 <linux/capability.h>
20
21 #include "xfs.h"
22 #include "xfs_fs.h"
23 #include "xfs_types.h"
24 #include "xfs_bit.h"
25 #include "xfs_log.h"
26 #include "xfs_inum.h"
27 #include "xfs_trans.h"
28 #include "xfs_sb.h"
29 #include "xfs_ag.h"
30 #include "xfs_dir2.h"
31 #include "xfs_dmapi.h"
32 #include "xfs_mount.h"
33 #include "xfs_da_btree.h"
34 #include "xfs_bmap_btree.h"
35 #include "xfs_alloc_btree.h"
36 #include "xfs_ialloc_btree.h"
37 #include "xfs_dir2_sf.h"
38 #include "xfs_attr_sf.h"
39 #include "xfs_dinode.h"
40 #include "xfs_inode.h"
41 #include "xfs_alloc.h"
42 #include "xfs_btree.h"
43 #include "xfs_inode_item.h"
44 #include "xfs_bmap.h"
45 #include "xfs_attr.h"
46 #include "xfs_attr_leaf.h"
47 #include "xfs_error.h"
48 #include "xfs_quota.h"
49 #include "xfs_trans_space.h"
50 #include "xfs_acl.h"
51 #include "xfs_rw.h"
52
53 /*
54 * xfs_attr.c
55 *
56 * Provide the external interfaces to manage attribute lists.
57 */
58
59 #define ATTR_SYSCOUNT 2
60 static struct attrnames posix_acl_access;
61 static struct attrnames posix_acl_default;
62 static struct attrnames *attr_system_names[ATTR_SYSCOUNT];
63
64 /*========================================================================
65 * Function prototypes for the kernel.
66 *========================================================================*/
67
68 /*
69 * Internal routines when attribute list fits inside the inode.
70 */
71 STATIC int xfs_attr_shortform_addname(xfs_da_args_t *args);
72
73 /*
74 * Internal routines when attribute list is one block.
75 */
76 STATIC int xfs_attr_leaf_get(xfs_da_args_t *args);
77 STATIC int xfs_attr_leaf_addname(xfs_da_args_t *args);
78 STATIC int xfs_attr_leaf_removename(xfs_da_args_t *args);
79 STATIC int xfs_attr_leaf_list(xfs_attr_list_context_t *context);
80
81 /*
82 * Internal routines when attribute list is more than one block.
83 */
84 STATIC int xfs_attr_node_get(xfs_da_args_t *args);
85 STATIC int xfs_attr_node_addname(xfs_da_args_t *args);
86 STATIC int xfs_attr_node_removename(xfs_da_args_t *args);
87 STATIC int xfs_attr_node_list(xfs_attr_list_context_t *context);
88 STATIC int xfs_attr_fillstate(xfs_da_state_t *state);
89 STATIC int xfs_attr_refillstate(xfs_da_state_t *state);
90
91 /*
92 * Routines to manipulate out-of-line attribute values.
93 */
94 STATIC int xfs_attr_rmtval_set(xfs_da_args_t *args);
95 STATIC int xfs_attr_rmtval_remove(xfs_da_args_t *args);
96
97 #define ATTR_RMTVALUE_MAPSIZE 1 /* # of map entries at once */
98
99 #if defined(XFS_ATTR_TRACE)
100 ktrace_t *xfs_attr_trace_buf;
101 #endif
102
103
104 /*========================================================================
105 * Overall external interface routines.
106 *========================================================================*/
107
108 int
109 xfs_attr_fetch(xfs_inode_t *ip, const char *name, int namelen,
110 char *value, int *valuelenp, int flags, struct cred *cred)
111 {
112 xfs_da_args_t args;
113 int error;
114
115 if ((XFS_IFORK_Q(ip) == 0) ||
116 (ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
117 ip->i_d.di_anextents == 0))
118 return(ENOATTR);
119
120 /*
121 * Fill in the arg structure for this request.
122 */
123 memset((char *)&args, 0, sizeof(args));
124 args.name = name;
125 args.namelen = namelen;
126 args.value = value;
127 args.valuelen = *valuelenp;
128 args.flags = flags;
129 args.hashval = xfs_da_hashname(args.name, args.namelen);
130 args.dp = ip;
131 args.whichfork = XFS_ATTR_FORK;
132
133 /*
134 * Decide on what work routines to call based on the inode size.
135 */
136 if (XFS_IFORK_Q(ip) == 0 ||
137 (ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
138 ip->i_d.di_anextents == 0)) {
139 error = XFS_ERROR(ENOATTR);
140 } else if (ip->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
141 error = xfs_attr_shortform_getvalue(&args);
142 } else if (xfs_bmap_one_block(ip, XFS_ATTR_FORK)) {
143 error = xfs_attr_leaf_get(&args);
144 } else {
145 error = xfs_attr_node_get(&args);
146 }
147
148 /*
149 * Return the number of bytes in the value to the caller.
150 */
151 *valuelenp = args.valuelen;
152
153 if (error == EEXIST)
154 error = 0;
155 return(error);
156 }
157
158 int
159 xfs_attr_get(bhv_desc_t *bdp, const char *name, char *value, int *valuelenp,
160 int flags, struct cred *cred)
161 {
162 xfs_inode_t *ip = XFS_BHVTOI(bdp);
163 int error, namelen;
164
165 XFS_STATS_INC(xs_attr_get);
166
167 if (!name)
168 return(EINVAL);
169 namelen = strlen(name);
170 if (namelen >= MAXNAMELEN)
171 return(EFAULT); /* match IRIX behaviour */
172
173 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
174 return(EIO);
175
176 xfs_ilock(ip, XFS_ILOCK_SHARED);
177 error = xfs_attr_fetch(ip, name, namelen, value, valuelenp, flags, cred);
178 xfs_iunlock(ip, XFS_ILOCK_SHARED);
179 return(error);
180 }
181
182 int
183 xfs_attr_set_int(xfs_inode_t *dp, const char *name, int namelen,
184 char *value, int valuelen, int flags)
185 {
186 xfs_da_args_t args;
187 xfs_fsblock_t firstblock;
188 xfs_bmap_free_t flist;
189 int error, err2, committed;
190 int local, size;
191 uint nblks;
192 xfs_mount_t *mp = dp->i_mount;
193 int rsvd = (flags & ATTR_ROOT) != 0;
194
195 /*
196 * Attach the dquots to the inode.
197 */
198 if ((error = XFS_QM_DQATTACH(mp, dp, 0)))
199 return (error);
200
201 /*
202 * If the inode doesn't have an attribute fork, add one.
203 * (inode must not be locked when we call this routine)
204 */
205 if (XFS_IFORK_Q(dp) == 0) {
206 int sf_size = sizeof(xfs_attr_sf_hdr_t) +
207 XFS_ATTR_SF_ENTSIZE_BYNAME(namelen, valuelen);
208
209 if ((error = xfs_bmap_add_attrfork(dp, sf_size, rsvd)))
210 return(error);
211 }
212
213 /*
214 * Fill in the arg structure for this request.
215 */
216 memset((char *)&args, 0, sizeof(args));
217 args.name = name;
218 args.namelen = namelen;
219 args.value = value;
220 args.valuelen = valuelen;
221 args.flags = flags;
222 args.hashval = xfs_da_hashname(args.name, args.namelen);
223 args.dp = dp;
224 args.firstblock = &firstblock;
225 args.flist = &flist;
226 args.whichfork = XFS_ATTR_FORK;
227 args.addname = 1;
228 args.oknoent = 1;
229
230 /*
231 * Determine space new attribute will use, and if it would be
232 * "local" or "remote" (note: local != inline).
233 */
234 size = xfs_attr_leaf_newentsize(namelen, valuelen,
235 mp->m_sb.sb_blocksize, &local);
236
237 nblks = XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK);
238 if (local) {
239 if (size > (mp->m_sb.sb_blocksize >> 1)) {
240 /* Double split possible */
241 nblks <<= 1;
242 }
243 } else {
244 uint dblocks = XFS_B_TO_FSB(mp, valuelen);
245 /* Out of line attribute, cannot double split, but make
246 * room for the attribute value itself.
247 */
248 nblks += dblocks;
249 nblks += XFS_NEXTENTADD_SPACE_RES(mp, dblocks, XFS_ATTR_FORK);
250 }
251
252 /* Size is now blocks for attribute data */
253 args.total = nblks;
254
255 /*
256 * Start our first transaction of the day.
257 *
258 * All future transactions during this code must be "chained" off
259 * this one via the trans_dup() call. All transactions will contain
260 * the inode, and the inode will always be marked with trans_ihold().
261 * Since the inode will be locked in all transactions, we must log
262 * the inode in every transaction to let it float upward through
263 * the log.
264 */
265 args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_SET);
266
267 /*
268 * Root fork attributes can use reserved data blocks for this
269 * operation if necessary
270 */
271
272 if (rsvd)
273 args.trans->t_flags |= XFS_TRANS_RESERVE;
274
275 if ((error = xfs_trans_reserve(args.trans, (uint) nblks,
276 XFS_ATTRSET_LOG_RES(mp, nblks),
277 0, XFS_TRANS_PERM_LOG_RES,
278 XFS_ATTRSET_LOG_COUNT))) {
279 xfs_trans_cancel(args.trans, 0);
280 return(error);
281 }
282 xfs_ilock(dp, XFS_ILOCK_EXCL);
283
284 error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, args.trans, dp, nblks, 0,
285 rsvd ? XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
286 XFS_QMOPT_RES_REGBLKS);
287 if (error) {
288 xfs_iunlock(dp, XFS_ILOCK_EXCL);
289 xfs_trans_cancel(args.trans, XFS_TRANS_RELEASE_LOG_RES);
290 return (error);
291 }
292
293 xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
294 xfs_trans_ihold(args.trans, dp);
295
296 /*
297 * If the attribute list is non-existent or a shortform list,
298 * upgrade it to a single-leaf-block attribute list.
299 */
300 if ((dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
301 ((dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS) &&
302 (dp->i_d.di_anextents == 0))) {
303
304 /*
305 * Build initial attribute list (if required).
306 */
307 if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS)
308 xfs_attr_shortform_create(&args);
309
310 /*
311 * Try to add the attr to the attribute list in
312 * the inode.
313 */
314 error = xfs_attr_shortform_addname(&args);
315 if (error != ENOSPC) {
316 /*
317 * Commit the shortform mods, and we're done.
318 * NOTE: this is also the error path (EEXIST, etc).
319 */
320 ASSERT(args.trans != NULL);
321
322 /*
323 * If this is a synchronous mount, make sure that
324 * the transaction goes to disk before returning
325 * to the user.
326 */
327 if (mp->m_flags & XFS_MOUNT_WSYNC) {
328 xfs_trans_set_sync(args.trans);
329 }
330 err2 = xfs_trans_commit(args.trans,
331 XFS_TRANS_RELEASE_LOG_RES,
332 NULL);
333 xfs_iunlock(dp, XFS_ILOCK_EXCL);
334
335 /*
336 * Hit the inode change time.
337 */
338 if (!error && (flags & ATTR_KERNOTIME) == 0) {
339 xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
340 }
341 return(error == 0 ? err2 : error);
342 }
343
344 /*
345 * It won't fit in the shortform, transform to a leaf block.
346 * GROT: another possible req'mt for a double-split btree op.
347 */
348 XFS_BMAP_INIT(args.flist, args.firstblock);
349 error = xfs_attr_shortform_to_leaf(&args);
350 if (!error) {
351 error = xfs_bmap_finish(&args.trans, args.flist,
352 &committed);
353 }
354 if (error) {
355 ASSERT(committed);
356 args.trans = NULL;
357 xfs_bmap_cancel(&flist);
358 goto out;
359 }
360
361 /*
362 * bmap_finish() may have committed the last trans and started
363 * a new one. We need the inode to be in all transactions.
364 */
365 if (committed) {
366 xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
367 xfs_trans_ihold(args.trans, dp);
368 }
369
370 /*
371 * Commit the leaf transformation. We'll need another (linked)
372 * transaction to add the new attribute to the leaf.
373 */
374 if ((error = xfs_attr_rolltrans(&args.trans, dp)))
375 goto out;
376
377 }
378
379 if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
380 error = xfs_attr_leaf_addname(&args);
381 } else {
382 error = xfs_attr_node_addname(&args);
383 }
384 if (error) {
385 goto out;
386 }
387
388 /*
389 * If this is a synchronous mount, make sure that the
390 * transaction goes to disk before returning to the user.
391 */
392 if (mp->m_flags & XFS_MOUNT_WSYNC) {
393 xfs_trans_set_sync(args.trans);
394 }
395
396 /*
397 * Commit the last in the sequence of transactions.
398 */
399 xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
400 error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES,
401 NULL);
402 xfs_iunlock(dp, XFS_ILOCK_EXCL);
403
404 /*
405 * Hit the inode change time.
406 */
407 if (!error && (flags & ATTR_KERNOTIME) == 0) {
408 xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
409 }
410
411 return(error);
412
413 out:
414 if (args.trans)
415 xfs_trans_cancel(args.trans,
416 XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
417 xfs_iunlock(dp, XFS_ILOCK_EXCL);
418 return(error);
419 }
420
421 int
422 xfs_attr_set(bhv_desc_t *bdp, const char *name, char *value, int valuelen, int flags,
423 struct cred *cred)
424 {
425 xfs_inode_t *dp;
426 int namelen;
427
428 namelen = strlen(name);
429 if (namelen >= MAXNAMELEN)
430 return EFAULT; /* match IRIX behaviour */
431
432 XFS_STATS_INC(xs_attr_set);
433
434 dp = XFS_BHVTOI(bdp);
435 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
436 return (EIO);
437
438 return xfs_attr_set_int(dp, name, namelen, value, valuelen, flags);
439 }
440
441 /*
442 * Generic handler routine to remove a name from an attribute list.
443 * Transitions attribute list from Btree to shortform as necessary.
444 */
445 int
446 xfs_attr_remove_int(xfs_inode_t *dp, const char *name, int namelen, int flags)
447 {
448 xfs_da_args_t args;
449 xfs_fsblock_t firstblock;
450 xfs_bmap_free_t flist;
451 int error;
452 xfs_mount_t *mp = dp->i_mount;
453
454 /*
455 * Fill in the arg structure for this request.
456 */
457 memset((char *)&args, 0, sizeof(args));
458 args.name = name;
459 args.namelen = namelen;
460 args.flags = flags;
461 args.hashval = xfs_da_hashname(args.name, args.namelen);
462 args.dp = dp;
463 args.firstblock = &firstblock;
464 args.flist = &flist;
465 args.total = 0;
466 args.whichfork = XFS_ATTR_FORK;
467
468 /*
469 * Attach the dquots to the inode.
470 */
471 if ((error = XFS_QM_DQATTACH(mp, dp, 0)))
472 return (error);
473
474 /*
475 * Start our first transaction of the day.
476 *
477 * All future transactions during this code must be "chained" off
478 * this one via the trans_dup() call. All transactions will contain
479 * the inode, and the inode will always be marked with trans_ihold().
480 * Since the inode will be locked in all transactions, we must log
481 * the inode in every transaction to let it float upward through
482 * the log.
483 */
484 args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_RM);
485
486 /*
487 * Root fork attributes can use reserved data blocks for this
488 * operation if necessary
489 */
490
491 if (flags & ATTR_ROOT)
492 args.trans->t_flags |= XFS_TRANS_RESERVE;
493
494 if ((error = xfs_trans_reserve(args.trans,
495 XFS_ATTRRM_SPACE_RES(mp),
496 XFS_ATTRRM_LOG_RES(mp),
497 0, XFS_TRANS_PERM_LOG_RES,
498 XFS_ATTRRM_LOG_COUNT))) {
499 xfs_trans_cancel(args.trans, 0);
500 return(error);
501 }
502
503 xfs_ilock(dp, XFS_ILOCK_EXCL);
504 /*
505 * No need to make quota reservations here. We expect to release some
506 * blocks not allocate in the common case.
507 */
508 xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
509 xfs_trans_ihold(args.trans, dp);
510
511 /*
512 * Decide on what work routines to call based on the inode size.
513 */
514 if (XFS_IFORK_Q(dp) == 0 ||
515 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
516 dp->i_d.di_anextents == 0)) {
517 error = XFS_ERROR(ENOATTR);
518 goto out;
519 }
520 if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
521 ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
522 error = xfs_attr_shortform_remove(&args);
523 if (error) {
524 goto out;
525 }
526 } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
527 error = xfs_attr_leaf_removename(&args);
528 } else {
529 error = xfs_attr_node_removename(&args);
530 }
531 if (error) {
532 goto out;
533 }
534
535 /*
536 * If this is a synchronous mount, make sure that the
537 * transaction goes to disk before returning to the user.
538 */
539 if (mp->m_flags & XFS_MOUNT_WSYNC) {
540 xfs_trans_set_sync(args.trans);
541 }
542
543 /*
544 * Commit the last in the sequence of transactions.
545 */
546 xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
547 error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES,
548 NULL);
549 xfs_iunlock(dp, XFS_ILOCK_EXCL);
550
551 /*
552 * Hit the inode change time.
553 */
554 if (!error && (flags & ATTR_KERNOTIME) == 0) {
555 xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
556 }
557
558 return(error);
559
560 out:
561 if (args.trans)
562 xfs_trans_cancel(args.trans,
563 XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
564 xfs_iunlock(dp, XFS_ILOCK_EXCL);
565 return(error);
566 }
567
568 int
569 xfs_attr_remove(bhv_desc_t *bdp, const char *name, int flags, struct cred *cred)
570 {
571 xfs_inode_t *dp;
572 int namelen;
573
574 namelen = strlen(name);
575 if (namelen >= MAXNAMELEN)
576 return EFAULT; /* match IRIX behaviour */
577
578 XFS_STATS_INC(xs_attr_remove);
579
580 dp = XFS_BHVTOI(bdp);
581 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
582 return (EIO);
583
584 xfs_ilock(dp, XFS_ILOCK_SHARED);
585 if (XFS_IFORK_Q(dp) == 0 ||
586 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
587 dp->i_d.di_anextents == 0)) {
588 xfs_iunlock(dp, XFS_ILOCK_SHARED);
589 return(XFS_ERROR(ENOATTR));
590 }
591 xfs_iunlock(dp, XFS_ILOCK_SHARED);
592
593 return xfs_attr_remove_int(dp, name, namelen, flags);
594 }
595
596 int /* error */
597 xfs_attr_list_int(xfs_attr_list_context_t *context)
598 {
599 int error;
600 xfs_inode_t *dp = context->dp;
601
602 /*
603 * Decide on what work routines to call based on the inode size.
604 */
605 if (XFS_IFORK_Q(dp) == 0 ||
606 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
607 dp->i_d.di_anextents == 0)) {
608 error = 0;
609 } else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
610 error = xfs_attr_shortform_list(context);
611 } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
612 error = xfs_attr_leaf_list(context);
613 } else {
614 error = xfs_attr_node_list(context);
615 }
616 return error;
617 }
618
619 #define ATTR_ENTBASESIZE /* minimum bytes used by an attr */ \
620 (((struct attrlist_ent *) 0)->a_name - (char *) 0)
621 #define ATTR_ENTSIZE(namelen) /* actual bytes used by an attr */ \
622 ((ATTR_ENTBASESIZE + (namelen) + 1 + sizeof(u_int32_t)-1) \
623 & ~(sizeof(u_int32_t)-1))
624
625 /*
626 * Format an attribute and copy it out to the user's buffer.
627 * Take care to check values and protect against them changing later,
628 * we may be reading them directly out of a user buffer.
629 */
630 /*ARGSUSED*/
631 STATIC int
632 xfs_attr_put_listent(xfs_attr_list_context_t *context, attrnames_t *namesp,
633 char *name, int namelen,
634 int valuelen, char *value)
635 {
636 attrlist_ent_t *aep;
637 int arraytop;
638
639 ASSERT(!(context->flags & ATTR_KERNOVAL));
640 ASSERT(context->count >= 0);
641 ASSERT(context->count < (ATTR_MAX_VALUELEN/8));
642 ASSERT(context->firstu >= sizeof(*context->alist));
643 ASSERT(context->firstu <= context->bufsize);
644
645 arraytop = sizeof(*context->alist) +
646 context->count * sizeof(context->alist->al_offset[0]);
647 context->firstu -= ATTR_ENTSIZE(namelen);
648 if (context->firstu < arraytop) {
649 xfs_attr_trace_l_c("buffer full", context);
650 context->alist->al_more = 1;
651 context->seen_enough = 1;
652 return 1;
653 }
654
655 aep = (attrlist_ent_t *)&(((char *)context->alist)[ context->firstu ]);
656 aep->a_valuelen = valuelen;
657 memcpy(aep->a_name, name, namelen);
658 aep->a_name[ namelen ] = 0;
659 context->alist->al_offset[ context->count++ ] = context->firstu;
660 context->alist->al_count = context->count;
661 xfs_attr_trace_l_c("add", context);
662 return 0;
663 }
664
665 STATIC int
666 xfs_attr_kern_list(xfs_attr_list_context_t *context, attrnames_t *namesp,
667 char *name, int namelen,
668 int valuelen, char *value)
669 {
670 char *offset;
671 int arraytop;
672
673 ASSERT(context->count >= 0);
674
675 arraytop = context->count + namesp->attr_namelen + namelen + 1;
676 if (arraytop > context->firstu) {
677 context->count = -1; /* insufficient space */
678 return 1;
679 }
680 offset = (char *)context->alist + context->count;
681 strncpy(offset, namesp->attr_name, namesp->attr_namelen);
682 offset += namesp->attr_namelen;
683 strncpy(offset, name, namelen); /* real name */
684 offset += namelen;
685 *offset = '\0';
686 context->count += namesp->attr_namelen + namelen + 1;
687 return 0;
688 }
689
690 /*ARGSUSED*/
691 STATIC int
692 xfs_attr_kern_list_sizes(xfs_attr_list_context_t *context, attrnames_t *namesp,
693 char *name, int namelen,
694 int valuelen, char *value)
695 {
696 context->count += namesp->attr_namelen + namelen + 1;
697 return 0;
698 }
699
700 /*
701 * Generate a list of extended attribute names and optionally
702 * also value lengths. Positive return value follows the XFS
703 * convention of being an error, zero or negative return code
704 * is the length of the buffer returned (negated), indicating
705 * success.
706 */
707 int
708 xfs_attr_list(bhv_desc_t *bdp, char *buffer, int bufsize, int flags,
709 attrlist_cursor_kern_t *cursor, struct cred *cred)
710 {
711 xfs_attr_list_context_t context;
712 xfs_inode_t *dp;
713 int error;
714
715 XFS_STATS_INC(xs_attr_list);
716
717 /*
718 * Validate the cursor.
719 */
720 if (cursor->pad1 || cursor->pad2)
721 return(XFS_ERROR(EINVAL));
722 if ((cursor->initted == 0) &&
723 (cursor->hashval || cursor->blkno || cursor->offset))
724 return XFS_ERROR(EINVAL);
725
726 /*
727 * Check for a properly aligned buffer.
728 */
729 if (((long)buffer) & (sizeof(int)-1))
730 return XFS_ERROR(EFAULT);
731 if (flags & ATTR_KERNOVAL)
732 bufsize = 0;
733
734 /*
735 * Initialize the output buffer.
736 */
737 context.dp = dp = XFS_BHVTOI(bdp);
738 context.cursor = cursor;
739 context.count = 0;
740 context.dupcnt = 0;
741 context.resynch = 1;
742 context.flags = flags;
743 context.seen_enough = 0;
744 context.alist = (attrlist_t *)buffer;
745 context.put_value = 0;
746
747 if (flags & ATTR_KERNAMELS) {
748 context.bufsize = bufsize;
749 context.firstu = context.bufsize;
750 if (flags & ATTR_KERNOVAL)
751 context.put_listent = xfs_attr_kern_list_sizes;
752 else
753 context.put_listent = xfs_attr_kern_list;
754 } else {
755 context.bufsize = (bufsize & ~(sizeof(int)-1)); /* align */
756 context.firstu = context.bufsize;
757 context.alist->al_count = 0;
758 context.alist->al_more = 0;
759 context.alist->al_offset[0] = context.bufsize;
760 context.put_listent = xfs_attr_put_listent;
761 }
762
763 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
764 return EIO;
765
766 xfs_ilock(dp, XFS_ILOCK_SHARED);
767 xfs_attr_trace_l_c("syscall start", &context);
768
769 error = xfs_attr_list_int(&context);
770
771 xfs_iunlock(dp, XFS_ILOCK_SHARED);
772 xfs_attr_trace_l_c("syscall end", &context);
773
774 if (context.flags & (ATTR_KERNOVAL|ATTR_KERNAMELS)) {
775 /* must return negated buffer size or the error */
776 if (context.count < 0)
777 error = XFS_ERROR(ERANGE);
778 else
779 error = -context.count;
780 } else
781 ASSERT(error >= 0);
782
783 return error;
784 }
785
786 int /* error */
787 xfs_attr_inactive(xfs_inode_t *dp)
788 {
789 xfs_trans_t *trans;
790 xfs_mount_t *mp;
791 int error;
792
793 mp = dp->i_mount;
794 ASSERT(! XFS_NOT_DQATTACHED(mp, dp));
795
796 xfs_ilock(dp, XFS_ILOCK_SHARED);
797 if ((XFS_IFORK_Q(dp) == 0) ||
798 (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
799 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
800 dp->i_d.di_anextents == 0)) {
801 xfs_iunlock(dp, XFS_ILOCK_SHARED);
802 return(0);
803 }
804 xfs_iunlock(dp, XFS_ILOCK_SHARED);
805
806 /*
807 * Start our first transaction of the day.
808 *
809 * All future transactions during this code must be "chained" off
810 * this one via the trans_dup() call. All transactions will contain
811 * the inode, and the inode will always be marked with trans_ihold().
812 * Since the inode will be locked in all transactions, we must log
813 * the inode in every transaction to let it float upward through
814 * the log.
815 */
816 trans = xfs_trans_alloc(mp, XFS_TRANS_ATTRINVAL);
817 if ((error = xfs_trans_reserve(trans, 0, XFS_ATTRINVAL_LOG_RES(mp), 0,
818 XFS_TRANS_PERM_LOG_RES,
819 XFS_ATTRINVAL_LOG_COUNT))) {
820 xfs_trans_cancel(trans, 0);
821 return(error);
822 }
823 xfs_ilock(dp, XFS_ILOCK_EXCL);
824
825 /*
826 * No need to make quota reservations here. We expect to release some
827 * blocks, not allocate, in the common case.
828 */
829 xfs_trans_ijoin(trans, dp, XFS_ILOCK_EXCL);
830 xfs_trans_ihold(trans, dp);
831
832 /*
833 * Decide on what work routines to call based on the inode size.
834 */
835 if ((XFS_IFORK_Q(dp) == 0) ||
836 (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
837 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
838 dp->i_d.di_anextents == 0)) {
839 error = 0;
840 goto out;
841 }
842 error = xfs_attr_root_inactive(&trans, dp);
843 if (error)
844 goto out;
845 /*
846 * signal synchronous inactive transactions unless this
847 * is a synchronous mount filesystem in which case we
848 * know that we're here because we've been called out of
849 * xfs_inactive which means that the last reference is gone
850 * and the unlink transaction has already hit the disk so
851 * async inactive transactions are safe.
852 */
853 if ((error = xfs_itruncate_finish(&trans, dp, 0LL, XFS_ATTR_FORK,
854 (!(mp->m_flags & XFS_MOUNT_WSYNC)
855 ? 1 : 0))))
856 goto out;
857
858 /*
859 * Commit the last in the sequence of transactions.
860 */
861 xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
862 error = xfs_trans_commit(trans, XFS_TRANS_RELEASE_LOG_RES,
863 NULL);
864 xfs_iunlock(dp, XFS_ILOCK_EXCL);
865
866 return(error);
867
868 out:
869 xfs_trans_cancel(trans, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
870 xfs_iunlock(dp, XFS_ILOCK_EXCL);
871 return(error);
872 }
873
874
875
876 /*========================================================================
877 * External routines when attribute list is inside the inode
878 *========================================================================*/
879
880 /*
881 * Add a name to the shortform attribute list structure
882 * This is the external routine.
883 */
884 STATIC int
885 xfs_attr_shortform_addname(xfs_da_args_t *args)
886 {
887 int newsize, forkoff, retval;
888
889 retval = xfs_attr_shortform_lookup(args);
890 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
891 return(retval);
892 } else if (retval == EEXIST) {
893 if (args->flags & ATTR_CREATE)
894 return(retval);
895 retval = xfs_attr_shortform_remove(args);
896 ASSERT(retval == 0);
897 }
898
899 if (args->namelen >= XFS_ATTR_SF_ENTSIZE_MAX ||
900 args->valuelen >= XFS_ATTR_SF_ENTSIZE_MAX)
901 return(XFS_ERROR(ENOSPC));
902
903 newsize = XFS_ATTR_SF_TOTSIZE(args->dp);
904 newsize += XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
905
906 forkoff = xfs_attr_shortform_bytesfit(args->dp, newsize);
907 if (!forkoff)
908 return(XFS_ERROR(ENOSPC));
909
910 xfs_attr_shortform_add(args, forkoff);
911 return(0);
912 }
913
914
915 /*========================================================================
916 * External routines when attribute list is one block
917 *========================================================================*/
918
919 /*
920 * Add a name to the leaf attribute list structure
921 *
922 * This leaf block cannot have a "remote" value, we only call this routine
923 * if bmap_one_block() says there is only one block (ie: no remote blks).
924 */
925 int
926 xfs_attr_leaf_addname(xfs_da_args_t *args)
927 {
928 xfs_inode_t *dp;
929 xfs_dabuf_t *bp;
930 int retval, error, committed, forkoff;
931
932 /*
933 * Read the (only) block in the attribute list in.
934 */
935 dp = args->dp;
936 args->blkno = 0;
937 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
938 XFS_ATTR_FORK);
939 if (error)
940 return(error);
941 ASSERT(bp != NULL);
942
943 /*
944 * Look up the given attribute in the leaf block. Figure out if
945 * the given flags produce an error or call for an atomic rename.
946 */
947 retval = xfs_attr_leaf_lookup_int(bp, args);
948 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
949 xfs_da_brelse(args->trans, bp);
950 return(retval);
951 } else if (retval == EEXIST) {
952 if (args->flags & ATTR_CREATE) { /* pure create op */
953 xfs_da_brelse(args->trans, bp);
954 return(retval);
955 }
956 args->rename = 1; /* an atomic rename */
957 args->blkno2 = args->blkno; /* set 2nd entry info*/
958 args->index2 = args->index;
959 args->rmtblkno2 = args->rmtblkno;
960 args->rmtblkcnt2 = args->rmtblkcnt;
961 }
962
963 /*
964 * Add the attribute to the leaf block, transitioning to a Btree
965 * if required.
966 */
967 retval = xfs_attr_leaf_add(bp, args);
968 xfs_da_buf_done(bp);
969 if (retval == ENOSPC) {
970 /*
971 * Promote the attribute list to the Btree format, then
972 * Commit that transaction so that the node_addname() call
973 * can manage its own transactions.
974 */
975 XFS_BMAP_INIT(args->flist, args->firstblock);
976 error = xfs_attr_leaf_to_node(args);
977 if (!error) {
978 error = xfs_bmap_finish(&args->trans, args->flist,
979 &committed);
980 }
981 if (error) {
982 ASSERT(committed);
983 args->trans = NULL;
984 xfs_bmap_cancel(args->flist);
985 return(error);
986 }
987
988 /*
989 * bmap_finish() may have committed the last trans and started
990 * a new one. We need the inode to be in all transactions.
991 */
992 if (committed) {
993 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
994 xfs_trans_ihold(args->trans, dp);
995 }
996
997 /*
998 * Commit the current trans (including the inode) and start
999 * a new one.
1000 */
1001 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1002 return (error);
1003
1004 /*
1005 * Fob the whole rest of the problem off on the Btree code.
1006 */
1007 error = xfs_attr_node_addname(args);
1008 return(error);
1009 }
1010
1011 /*
1012 * Commit the transaction that added the attr name so that
1013 * later routines can manage their own transactions.
1014 */
1015 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1016 return (error);
1017
1018 /*
1019 * If there was an out-of-line value, allocate the blocks we
1020 * identified for its storage and copy the value. This is done
1021 * after we create the attribute so that we don't overflow the
1022 * maximum size of a transaction and/or hit a deadlock.
1023 */
1024 if (args->rmtblkno > 0) {
1025 error = xfs_attr_rmtval_set(args);
1026 if (error)
1027 return(error);
1028 }
1029
1030 /*
1031 * If this is an atomic rename operation, we must "flip" the
1032 * incomplete flags on the "new" and "old" attribute/value pairs
1033 * so that one disappears and one appears atomically. Then we
1034 * must remove the "old" attribute/value pair.
1035 */
1036 if (args->rename) {
1037 /*
1038 * In a separate transaction, set the incomplete flag on the
1039 * "old" attr and clear the incomplete flag on the "new" attr.
1040 */
1041 error = xfs_attr_leaf_flipflags(args);
1042 if (error)
1043 return(error);
1044
1045 /*
1046 * Dismantle the "old" attribute/value pair by removing
1047 * a "remote" value (if it exists).
1048 */
1049 args->index = args->index2;
1050 args->blkno = args->blkno2;
1051 args->rmtblkno = args->rmtblkno2;
1052 args->rmtblkcnt = args->rmtblkcnt2;
1053 if (args->rmtblkno) {
1054 error = xfs_attr_rmtval_remove(args);
1055 if (error)
1056 return(error);
1057 }
1058
1059 /*
1060 * Read in the block containing the "old" attr, then
1061 * remove the "old" attr from that block (neat, huh!)
1062 */
1063 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1,
1064 &bp, XFS_ATTR_FORK);
1065 if (error)
1066 return(error);
1067 ASSERT(bp != NULL);
1068 (void)xfs_attr_leaf_remove(bp, args);
1069
1070 /*
1071 * If the result is small enough, shrink it all into the inode.
1072 */
1073 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1074 XFS_BMAP_INIT(args->flist, args->firstblock);
1075 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1076 /* bp is gone due to xfs_da_shrink_inode */
1077 if (!error) {
1078 error = xfs_bmap_finish(&args->trans,
1079 args->flist,
1080 &committed);
1081 }
1082 if (error) {
1083 ASSERT(committed);
1084 args->trans = NULL;
1085 xfs_bmap_cancel(args->flist);
1086 return(error);
1087 }
1088
1089 /*
1090 * bmap_finish() may have committed the last trans
1091 * and started a new one. We need the inode to be
1092 * in all transactions.
1093 */
1094 if (committed) {
1095 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1096 xfs_trans_ihold(args->trans, dp);
1097 }
1098 } else
1099 xfs_da_buf_done(bp);
1100
1101 /*
1102 * Commit the remove and start the next trans in series.
1103 */
1104 error = xfs_attr_rolltrans(&args->trans, dp);
1105
1106 } else if (args->rmtblkno > 0) {
1107 /*
1108 * Added a "remote" value, just clear the incomplete flag.
1109 */
1110 error = xfs_attr_leaf_clearflag(args);
1111 }
1112 return(error);
1113 }
1114
1115 /*
1116 * Remove a name from the leaf attribute list structure
1117 *
1118 * This leaf block cannot have a "remote" value, we only call this routine
1119 * if bmap_one_block() says there is only one block (ie: no remote blks).
1120 */
1121 STATIC int
1122 xfs_attr_leaf_removename(xfs_da_args_t *args)
1123 {
1124 xfs_inode_t *dp;
1125 xfs_dabuf_t *bp;
1126 int error, committed, forkoff;
1127
1128 /*
1129 * Remove the attribute.
1130 */
1131 dp = args->dp;
1132 args->blkno = 0;
1133 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
1134 XFS_ATTR_FORK);
1135 if (error) {
1136 return(error);
1137 }
1138
1139 ASSERT(bp != NULL);
1140 error = xfs_attr_leaf_lookup_int(bp, args);
1141 if (error == ENOATTR) {
1142 xfs_da_brelse(args->trans, bp);
1143 return(error);
1144 }
1145
1146 (void)xfs_attr_leaf_remove(bp, args);
1147
1148 /*
1149 * If the result is small enough, shrink it all into the inode.
1150 */
1151 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1152 XFS_BMAP_INIT(args->flist, args->firstblock);
1153 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1154 /* bp is gone due to xfs_da_shrink_inode */
1155 if (!error) {
1156 error = xfs_bmap_finish(&args->trans, args->flist,
1157 &committed);
1158 }
1159 if (error) {
1160 ASSERT(committed);
1161 args->trans = NULL;
1162 xfs_bmap_cancel(args->flist);
1163 return(error);
1164 }
1165
1166 /*
1167 * bmap_finish() may have committed the last trans and started
1168 * a new one. We need the inode to be in all transactions.
1169 */
1170 if (committed) {
1171 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1172 xfs_trans_ihold(args->trans, dp);
1173 }
1174 } else
1175 xfs_da_buf_done(bp);
1176 return(0);
1177 }
1178
1179 /*
1180 * Look up a name in a leaf attribute list structure.
1181 *
1182 * This leaf block cannot have a "remote" value, we only call this routine
1183 * if bmap_one_block() says there is only one block (ie: no remote blks).
1184 */
1185 STATIC int
1186 xfs_attr_leaf_get(xfs_da_args_t *args)
1187 {
1188 xfs_dabuf_t *bp;
1189 int error;
1190
1191 args->blkno = 0;
1192 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
1193 XFS_ATTR_FORK);
1194 if (error)
1195 return(error);
1196 ASSERT(bp != NULL);
1197
1198 error = xfs_attr_leaf_lookup_int(bp, args);
1199 if (error != EEXIST) {
1200 xfs_da_brelse(args->trans, bp);
1201 return(error);
1202 }
1203 error = xfs_attr_leaf_getvalue(bp, args);
1204 xfs_da_brelse(args->trans, bp);
1205 if (!error && (args->rmtblkno > 0) && !(args->flags & ATTR_KERNOVAL)) {
1206 error = xfs_attr_rmtval_get(args);
1207 }
1208 return(error);
1209 }
1210
1211 /*
1212 * Copy out attribute entries for attr_list(), for leaf attribute lists.
1213 */
1214 STATIC int
1215 xfs_attr_leaf_list(xfs_attr_list_context_t *context)
1216 {
1217 xfs_attr_leafblock_t *leaf;
1218 int error;
1219 xfs_dabuf_t *bp;
1220
1221 context->cursor->blkno = 0;
1222 error = xfs_da_read_buf(NULL, context->dp, 0, -1, &bp, XFS_ATTR_FORK);
1223 if (error)
1224 return XFS_ERROR(error);
1225 ASSERT(bp != NULL);
1226 leaf = bp->data;
1227 if (unlikely(be16_to_cpu(leaf->hdr.info.magic) != XFS_ATTR_LEAF_MAGIC)) {
1228 XFS_CORRUPTION_ERROR("xfs_attr_leaf_list", XFS_ERRLEVEL_LOW,
1229 context->dp->i_mount, leaf);
1230 xfs_da_brelse(NULL, bp);
1231 return XFS_ERROR(EFSCORRUPTED);
1232 }
1233
1234 error = xfs_attr_leaf_list_int(bp, context);
1235 xfs_da_brelse(NULL, bp);
1236 return XFS_ERROR(error);
1237 }
1238
1239
1240 /*========================================================================
1241 * External routines when attribute list size > XFS_LBSIZE(mp).
1242 *========================================================================*/
1243
1244 /*
1245 * Add a name to a Btree-format attribute list.
1246 *
1247 * This will involve walking down the Btree, and may involve splitting
1248 * leaf nodes and even splitting intermediate nodes up to and including
1249 * the root node (a special case of an intermediate node).
1250 *
1251 * "Remote" attribute values confuse the issue and atomic rename operations
1252 * add a whole extra layer of confusion on top of that.
1253 */
1254 STATIC int
1255 xfs_attr_node_addname(xfs_da_args_t *args)
1256 {
1257 xfs_da_state_t *state;
1258 xfs_da_state_blk_t *blk;
1259 xfs_inode_t *dp;
1260 xfs_mount_t *mp;
1261 int committed, retval, error;
1262
1263 /*
1264 * Fill in bucket of arguments/results/context to carry around.
1265 */
1266 dp = args->dp;
1267 mp = dp->i_mount;
1268 restart:
1269 state = xfs_da_state_alloc();
1270 state->args = args;
1271 state->mp = mp;
1272 state->blocksize = state->mp->m_sb.sb_blocksize;
1273 state->node_ents = state->mp->m_attr_node_ents;
1274
1275 /*
1276 * Search to see if name already exists, and get back a pointer
1277 * to where it should go.
1278 */
1279 error = xfs_da_node_lookup_int(state, &retval);
1280 if (error)
1281 goto out;
1282 blk = &state->path.blk[ state->path.active-1 ];
1283 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1284 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
1285 goto out;
1286 } else if (retval == EEXIST) {
1287 if (args->flags & ATTR_CREATE)
1288 goto out;
1289 args->rename = 1; /* atomic rename op */
1290 args->blkno2 = args->blkno; /* set 2nd entry info*/
1291 args->index2 = args->index;
1292 args->rmtblkno2 = args->rmtblkno;
1293 args->rmtblkcnt2 = args->rmtblkcnt;
1294 args->rmtblkno = 0;
1295 args->rmtblkcnt = 0;
1296 }
1297
1298 retval = xfs_attr_leaf_add(blk->bp, state->args);
1299 if (retval == ENOSPC) {
1300 if (state->path.active == 1) {
1301 /*
1302 * Its really a single leaf node, but it had
1303 * out-of-line values so it looked like it *might*
1304 * have been a b-tree.
1305 */
1306 xfs_da_state_free(state);
1307 XFS_BMAP_INIT(args->flist, args->firstblock);
1308 error = xfs_attr_leaf_to_node(args);
1309 if (!error) {
1310 error = xfs_bmap_finish(&args->trans,
1311 args->flist,
1312 &committed);
1313 }
1314 if (error) {
1315 ASSERT(committed);
1316 args->trans = NULL;
1317 xfs_bmap_cancel(args->flist);
1318 goto out;
1319 }
1320
1321 /*
1322 * bmap_finish() may have committed the last trans
1323 * and started a new one. We need the inode to be
1324 * in all transactions.
1325 */
1326 if (committed) {
1327 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1328 xfs_trans_ihold(args->trans, dp);
1329 }
1330
1331 /*
1332 * Commit the node conversion and start the next
1333 * trans in the chain.
1334 */
1335 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1336 goto out;
1337
1338 goto restart;
1339 }
1340
1341 /*
1342 * Split as many Btree elements as required.
1343 * This code tracks the new and old attr's location
1344 * in the index/blkno/rmtblkno/rmtblkcnt fields and
1345 * in the index2/blkno2/rmtblkno2/rmtblkcnt2 fields.
1346 */
1347 XFS_BMAP_INIT(args->flist, args->firstblock);
1348 error = xfs_da_split(state);
1349 if (!error) {
1350 error = xfs_bmap_finish(&args->trans, args->flist,
1351 &committed);
1352 }
1353 if (error) {
1354 ASSERT(committed);
1355 args->trans = NULL;
1356 xfs_bmap_cancel(args->flist);
1357 goto out;
1358 }
1359
1360 /*
1361 * bmap_finish() may have committed the last trans and started
1362 * a new one. We need the inode to be in all transactions.
1363 */
1364 if (committed) {
1365 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1366 xfs_trans_ihold(args->trans, dp);
1367 }
1368 } else {
1369 /*
1370 * Addition succeeded, update Btree hashvals.
1371 */
1372 xfs_da_fixhashpath(state, &state->path);
1373 }
1374
1375 /*
1376 * Kill the state structure, we're done with it and need to
1377 * allow the buffers to come back later.
1378 */
1379 xfs_da_state_free(state);
1380 state = NULL;
1381
1382 /*
1383 * Commit the leaf addition or btree split and start the next
1384 * trans in the chain.
1385 */
1386 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1387 goto out;
1388
1389 /*
1390 * If there was an out-of-line value, allocate the blocks we
1391 * identified for its storage and copy the value. This is done
1392 * after we create the attribute so that we don't overflow the
1393 * maximum size of a transaction and/or hit a deadlock.
1394 */
1395 if (args->rmtblkno > 0) {
1396 error = xfs_attr_rmtval_set(args);
1397 if (error)
1398 return(error);
1399 }
1400
1401 /*
1402 * If this is an atomic rename operation, we must "flip" the
1403 * incomplete flags on the "new" and "old" attribute/value pairs
1404 * so that one disappears and one appears atomically. Then we
1405 * must remove the "old" attribute/value pair.
1406 */
1407 if (args->rename) {
1408 /*
1409 * In a separate transaction, set the incomplete flag on the
1410 * "old" attr and clear the incomplete flag on the "new" attr.
1411 */
1412 error = xfs_attr_leaf_flipflags(args);
1413 if (error)
1414 goto out;
1415
1416 /*
1417 * Dismantle the "old" attribute/value pair by removing
1418 * a "remote" value (if it exists).
1419 */
1420 args->index = args->index2;
1421 args->blkno = args->blkno2;
1422 args->rmtblkno = args->rmtblkno2;
1423 args->rmtblkcnt = args->rmtblkcnt2;
1424 if (args->rmtblkno) {
1425 error = xfs_attr_rmtval_remove(args);
1426 if (error)
1427 return(error);
1428 }
1429
1430 /*
1431 * Re-find the "old" attribute entry after any split ops.
1432 * The INCOMPLETE flag means that we will find the "old"
1433 * attr, not the "new" one.
1434 */
1435 args->flags |= XFS_ATTR_INCOMPLETE;
1436 state = xfs_da_state_alloc();
1437 state->args = args;
1438 state->mp = mp;
1439 state->blocksize = state->mp->m_sb.sb_blocksize;
1440 state->node_ents = state->mp->m_attr_node_ents;
1441 state->inleaf = 0;
1442 error = xfs_da_node_lookup_int(state, &retval);
1443 if (error)
1444 goto out;
1445
1446 /*
1447 * Remove the name and update the hashvals in the tree.
1448 */
1449 blk = &state->path.blk[ state->path.active-1 ];
1450 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1451 error = xfs_attr_leaf_remove(blk->bp, args);
1452 xfs_da_fixhashpath(state, &state->path);
1453
1454 /*
1455 * Check to see if the tree needs to be collapsed.
1456 */
1457 if (retval && (state->path.active > 1)) {
1458 XFS_BMAP_INIT(args->flist, args->firstblock);
1459 error = xfs_da_join(state);
1460 if (!error) {
1461 error = xfs_bmap_finish(&args->trans,
1462 args->flist,
1463 &committed);
1464 }
1465 if (error) {
1466 ASSERT(committed);
1467 args->trans = NULL;
1468 xfs_bmap_cancel(args->flist);
1469 goto out;
1470 }
1471
1472 /*
1473 * bmap_finish() may have committed the last trans
1474 * and started a new one. We need the inode to be
1475 * in all transactions.
1476 */
1477 if (committed) {
1478 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1479 xfs_trans_ihold(args->trans, dp);
1480 }
1481 }
1482
1483 /*
1484 * Commit and start the next trans in the chain.
1485 */
1486 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1487 goto out;
1488
1489 } else if (args->rmtblkno > 0) {
1490 /*
1491 * Added a "remote" value, just clear the incomplete flag.
1492 */
1493 error = xfs_attr_leaf_clearflag(args);
1494 if (error)
1495 goto out;
1496 }
1497 retval = error = 0;
1498
1499 out:
1500 if (state)
1501 xfs_da_state_free(state);
1502 if (error)
1503 return(error);
1504 return(retval);
1505 }
1506
1507 /*
1508 * Remove a name from a B-tree attribute list.
1509 *
1510 * This will involve walking down the Btree, and may involve joining
1511 * leaf nodes and even joining intermediate nodes up to and including
1512 * the root node (a special case of an intermediate node).
1513 */
1514 STATIC int
1515 xfs_attr_node_removename(xfs_da_args_t *args)
1516 {
1517 xfs_da_state_t *state;
1518 xfs_da_state_blk_t *blk;
1519 xfs_inode_t *dp;
1520 xfs_dabuf_t *bp;
1521 int retval, error, committed, forkoff;
1522
1523 /*
1524 * Tie a string around our finger to remind us where we are.
1525 */
1526 dp = args->dp;
1527 state = xfs_da_state_alloc();
1528 state->args = args;
1529 state->mp = dp->i_mount;
1530 state->blocksize = state->mp->m_sb.sb_blocksize;
1531 state->node_ents = state->mp->m_attr_node_ents;
1532
1533 /*
1534 * Search to see if name exists, and get back a pointer to it.
1535 */
1536 error = xfs_da_node_lookup_int(state, &retval);
1537 if (error || (retval != EEXIST)) {
1538 if (error == 0)
1539 error = retval;
1540 goto out;
1541 }
1542
1543 /*
1544 * If there is an out-of-line value, de-allocate the blocks.
1545 * This is done before we remove the attribute so that we don't
1546 * overflow the maximum size of a transaction and/or hit a deadlock.
1547 */
1548 blk = &state->path.blk[ state->path.active-1 ];
1549 ASSERT(blk->bp != NULL);
1550 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1551 if (args->rmtblkno > 0) {
1552 /*
1553 * Fill in disk block numbers in the state structure
1554 * so that we can get the buffers back after we commit
1555 * several transactions in the following calls.
1556 */
1557 error = xfs_attr_fillstate(state);
1558 if (error)
1559 goto out;
1560
1561 /*
1562 * Mark the attribute as INCOMPLETE, then bunmapi() the
1563 * remote value.
1564 */
1565 error = xfs_attr_leaf_setflag(args);
1566 if (error)
1567 goto out;
1568 error = xfs_attr_rmtval_remove(args);
1569 if (error)
1570 goto out;
1571
1572 /*
1573 * Refill the state structure with buffers, the prior calls
1574 * released our buffers.
1575 */
1576 error = xfs_attr_refillstate(state);
1577 if (error)
1578 goto out;
1579 }
1580
1581 /*
1582 * Remove the name and update the hashvals in the tree.
1583 */
1584 blk = &state->path.blk[ state->path.active-1 ];
1585 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1586 retval = xfs_attr_leaf_remove(blk->bp, args);
1587 xfs_da_fixhashpath(state, &state->path);
1588
1589 /*
1590 * Check to see if the tree needs to be collapsed.
1591 */
1592 if (retval && (state->path.active > 1)) {
1593 XFS_BMAP_INIT(args->flist, args->firstblock);
1594 error = xfs_da_join(state);
1595 if (!error) {
1596 error = xfs_bmap_finish(&args->trans, args->flist,
1597 &committed);
1598 }
1599 if (error) {
1600 ASSERT(committed);
1601 args->trans = NULL;
1602 xfs_bmap_cancel(args->flist);
1603 goto out;
1604 }
1605
1606 /*
1607 * bmap_finish() may have committed the last trans and started
1608 * a new one. We need the inode to be in all transactions.
1609 */
1610 if (committed) {
1611 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1612 xfs_trans_ihold(args->trans, dp);
1613 }
1614
1615 /*
1616 * Commit the Btree join operation and start a new trans.
1617 */
1618 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1619 goto out;
1620 }
1621
1622 /*
1623 * If the result is small enough, push it all into the inode.
1624 */
1625 if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
1626 /*
1627 * Have to get rid of the copy of this dabuf in the state.
1628 */
1629 ASSERT(state->path.active == 1);
1630 ASSERT(state->path.blk[0].bp);
1631 xfs_da_buf_done(state->path.blk[0].bp);
1632 state->path.blk[0].bp = NULL;
1633
1634 error = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp,
1635 XFS_ATTR_FORK);
1636 if (error)
1637 goto out;
1638 ASSERT(be16_to_cpu(((xfs_attr_leafblock_t *)
1639 bp->data)->hdr.info.magic)
1640 == XFS_ATTR_LEAF_MAGIC);
1641
1642 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1643 XFS_BMAP_INIT(args->flist, args->firstblock);
1644 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1645 /* bp is gone due to xfs_da_shrink_inode */
1646 if (!error) {
1647 error = xfs_bmap_finish(&args->trans,
1648 args->flist,
1649 &committed);
1650 }
1651 if (error) {
1652 ASSERT(committed);
1653 args->trans = NULL;
1654 xfs_bmap_cancel(args->flist);
1655 goto out;
1656 }
1657
1658 /*
1659 * bmap_finish() may have committed the last trans
1660 * and started a new one. We need the inode to be
1661 * in all transactions.
1662 */
1663 if (committed) {
1664 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1665 xfs_trans_ihold(args->trans, dp);
1666 }
1667 } else
1668 xfs_da_brelse(args->trans, bp);
1669 }
1670 error = 0;
1671
1672 out:
1673 xfs_da_state_free(state);
1674 return(error);
1675 }
1676
1677 /*
1678 * Fill in the disk block numbers in the state structure for the buffers
1679 * that are attached to the state structure.
1680 * This is done so that we can quickly reattach ourselves to those buffers
1681 * after some set of transaction commits have released these buffers.
1682 */
1683 STATIC int
1684 xfs_attr_fillstate(xfs_da_state_t *state)
1685 {
1686 xfs_da_state_path_t *path;
1687 xfs_da_state_blk_t *blk;
1688 int level;
1689
1690 /*
1691 * Roll down the "path" in the state structure, storing the on-disk
1692 * block number for those buffers in the "path".
1693 */
1694 path = &state->path;
1695 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1696 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1697 if (blk->bp) {
1698 blk->disk_blkno = xfs_da_blkno(blk->bp);
1699 xfs_da_buf_done(blk->bp);
1700 blk->bp = NULL;
1701 } else {
1702 blk->disk_blkno = 0;
1703 }
1704 }
1705
1706 /*
1707 * Roll down the "altpath" in the state structure, storing the on-disk
1708 * block number for those buffers in the "altpath".
1709 */
1710 path = &state->altpath;
1711 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1712 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1713 if (blk->bp) {
1714 blk->disk_blkno = xfs_da_blkno(blk->bp);
1715 xfs_da_buf_done(blk->bp);
1716 blk->bp = NULL;
1717 } else {
1718 blk->disk_blkno = 0;
1719 }
1720 }
1721
1722 return(0);
1723 }
1724
1725 /*
1726 * Reattach the buffers to the state structure based on the disk block
1727 * numbers stored in the state structure.
1728 * This is done after some set of transaction commits have released those
1729 * buffers from our grip.
1730 */
1731 STATIC int
1732 xfs_attr_refillstate(xfs_da_state_t *state)
1733 {
1734 xfs_da_state_path_t *path;
1735 xfs_da_state_blk_t *blk;
1736 int level, error;
1737
1738 /*
1739 * Roll down the "path" in the state structure, storing the on-disk
1740 * block number for those buffers in the "path".
1741 */
1742 path = &state->path;
1743 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1744 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1745 if (blk->disk_blkno) {
1746 error = xfs_da_read_buf(state->args->trans,
1747 state->args->dp,
1748 blk->blkno, blk->disk_blkno,
1749 &blk->bp, XFS_ATTR_FORK);
1750 if (error)
1751 return(error);
1752 } else {
1753 blk->bp = NULL;
1754 }
1755 }
1756
1757 /*
1758 * Roll down the "altpath" in the state structure, storing the on-disk
1759 * block number for those buffers in the "altpath".
1760 */
1761 path = &state->altpath;
1762 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1763 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1764 if (blk->disk_blkno) {
1765 error = xfs_da_read_buf(state->args->trans,
1766 state->args->dp,
1767 blk->blkno, blk->disk_blkno,
1768 &blk->bp, XFS_ATTR_FORK);
1769 if (error)
1770 return(error);
1771 } else {
1772 blk->bp = NULL;
1773 }
1774 }
1775
1776 return(0);
1777 }
1778
1779 /*
1780 * Look up a filename in a node attribute list.
1781 *
1782 * This routine gets called for any attribute fork that has more than one
1783 * block, ie: both true Btree attr lists and for single-leaf-blocks with
1784 * "remote" values taking up more blocks.
1785 */
1786 STATIC int
1787 xfs_attr_node_get(xfs_da_args_t *args)
1788 {
1789 xfs_da_state_t *state;
1790 xfs_da_state_blk_t *blk;
1791 int error, retval;
1792 int i;
1793
1794 state = xfs_da_state_alloc();
1795 state->args = args;
1796 state->mp = args->dp->i_mount;
1797 state->blocksize = state->mp->m_sb.sb_blocksize;
1798 state->node_ents = state->mp->m_attr_node_ents;
1799
1800 /*
1801 * Search to see if name exists, and get back a pointer to it.
1802 */
1803 error = xfs_da_node_lookup_int(state, &retval);
1804 if (error) {
1805 retval = error;
1806 } else if (retval == EEXIST) {
1807 blk = &state->path.blk[ state->path.active-1 ];
1808 ASSERT(blk->bp != NULL);
1809 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1810
1811 /*
1812 * Get the value, local or "remote"
1813 */
1814 retval = xfs_attr_leaf_getvalue(blk->bp, args);
1815 if (!retval && (args->rmtblkno > 0)
1816 && !(args->flags & ATTR_KERNOVAL)) {
1817 retval = xfs_attr_rmtval_get(args);
1818 }
1819 }
1820
1821 /*
1822 * If not in a transaction, we have to release all the buffers.
1823 */
1824 for (i = 0; i < state->path.active; i++) {
1825 xfs_da_brelse(args->trans, state->path.blk[i].bp);
1826 state->path.blk[i].bp = NULL;
1827 }
1828
1829 xfs_da_state_free(state);
1830 return(retval);
1831 }
1832
1833 STATIC int /* error */
1834 xfs_attr_node_list(xfs_attr_list_context_t *context)
1835 {
1836 attrlist_cursor_kern_t *cursor;
1837 xfs_attr_leafblock_t *leaf;
1838 xfs_da_intnode_t *node;
1839 xfs_da_node_entry_t *btree;
1840 int error, i;
1841 xfs_dabuf_t *bp;
1842
1843 cursor = context->cursor;
1844 cursor->initted = 1;
1845
1846 /*
1847 * Do all sorts of validation on the passed-in cursor structure.
1848 * If anything is amiss, ignore the cursor and look up the hashval
1849 * starting from the btree root.
1850 */
1851 bp = NULL;
1852 if (cursor->blkno > 0) {
1853 error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
1854 &bp, XFS_ATTR_FORK);
1855 if ((error != 0) && (error != EFSCORRUPTED))
1856 return(error);
1857 if (bp) {
1858 node = bp->data;
1859 switch (be16_to_cpu(node->hdr.info.magic)) {
1860 case XFS_DA_NODE_MAGIC:
1861 xfs_attr_trace_l_cn("wrong blk", context, node);
1862 xfs_da_brelse(NULL, bp);
1863 bp = NULL;
1864 break;
1865 case XFS_ATTR_LEAF_MAGIC:
1866 leaf = bp->data;
1867 if (cursor->hashval > be32_to_cpu(leaf->entries[
1868 be16_to_cpu(leaf->hdr.count)-1].hashval)) {
1869 xfs_attr_trace_l_cl("wrong blk",
1870 context, leaf);
1871 xfs_da_brelse(NULL, bp);
1872 bp = NULL;
1873 } else if (cursor->hashval <=
1874 be32_to_cpu(leaf->entries[0].hashval)) {
1875 xfs_attr_trace_l_cl("maybe wrong blk",
1876 context, leaf);
1877 xfs_da_brelse(NULL, bp);
1878 bp = NULL;
1879 }
1880 break;
1881 default:
1882 xfs_attr_trace_l_c("wrong blk - ??", context);
1883 xfs_da_brelse(NULL, bp);
1884 bp = NULL;
1885 }
1886 }
1887 }
1888
1889 /*
1890 * We did not find what we expected given the cursor's contents,
1891 * so we start from the top and work down based on the hash value.
1892 * Note that start of node block is same as start of leaf block.
1893 */
1894 if (bp == NULL) {
1895 cursor->blkno = 0;
1896 for (;;) {
1897 error = xfs_da_read_buf(NULL, context->dp,
1898 cursor->blkno, -1, &bp,
1899 XFS_ATTR_FORK);
1900 if (error)
1901 return(error);
1902 if (unlikely(bp == NULL)) {
1903 XFS_ERROR_REPORT("xfs_attr_node_list(2)",
1904 XFS_ERRLEVEL_LOW,
1905 context->dp->i_mount);
1906 return(XFS_ERROR(EFSCORRUPTED));
1907 }
1908 node = bp->data;
1909 if (be16_to_cpu(node->hdr.info.magic)
1910 == XFS_ATTR_LEAF_MAGIC)
1911 break;
1912 if (unlikely(be16_to_cpu(node->hdr.info.magic)
1913 != XFS_DA_NODE_MAGIC)) {
1914 XFS_CORRUPTION_ERROR("xfs_attr_node_list(3)",
1915 XFS_ERRLEVEL_LOW,
1916 context->dp->i_mount,
1917 node);
1918 xfs_da_brelse(NULL, bp);
1919 return(XFS_ERROR(EFSCORRUPTED));
1920 }
1921 btree = node->btree;
1922 for (i = 0; i < be16_to_cpu(node->hdr.count);
1923 btree++, i++) {
1924 if (cursor->hashval
1925 <= be32_to_cpu(btree->hashval)) {
1926 cursor->blkno = be32_to_cpu(btree->before);
1927 xfs_attr_trace_l_cb("descending",
1928 context, btree);
1929 break;
1930 }
1931 }
1932 if (i == be16_to_cpu(node->hdr.count)) {
1933 xfs_da_brelse(NULL, bp);
1934 return(0);
1935 }
1936 xfs_da_brelse(NULL, bp);
1937 }
1938 }
1939 ASSERT(bp != NULL);
1940
1941 /*
1942 * Roll upward through the blocks, processing each leaf block in
1943 * order. As long as there is space in the result buffer, keep
1944 * adding the information.
1945 */
1946 for (;;) {
1947 leaf = bp->data;
1948 if (unlikely(be16_to_cpu(leaf->hdr.info.magic)
1949 != XFS_ATTR_LEAF_MAGIC)) {
1950 XFS_CORRUPTION_ERROR("xfs_attr_node_list(4)",
1951 XFS_ERRLEVEL_LOW,
1952 context->dp->i_mount, leaf);
1953 xfs_da_brelse(NULL, bp);
1954 return(XFS_ERROR(EFSCORRUPTED));
1955 }
1956 error = xfs_attr_leaf_list_int(bp, context);
1957 if (error) {
1958 xfs_da_brelse(NULL, bp);
1959 return error;
1960 }
1961 if (context->seen_enough || leaf->hdr.info.forw == 0)
1962 break;
1963 cursor->blkno = be32_to_cpu(leaf->hdr.info.forw);
1964 xfs_da_brelse(NULL, bp);
1965 error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
1966 &bp, XFS_ATTR_FORK);
1967 if (error)
1968 return(error);
1969 if (unlikely((bp == NULL))) {
1970 XFS_ERROR_REPORT("xfs_attr_node_list(5)",
1971 XFS_ERRLEVEL_LOW,
1972 context->dp->i_mount);
1973 return(XFS_ERROR(EFSCORRUPTED));
1974 }
1975 }
1976 xfs_da_brelse(NULL, bp);
1977 return(0);
1978 }
1979
1980
1981 /*========================================================================
1982 * External routines for manipulating out-of-line attribute values.
1983 *========================================================================*/
1984
1985 /*
1986 * Read the value associated with an attribute from the out-of-line buffer
1987 * that we stored it in.
1988 */
1989 int
1990 xfs_attr_rmtval_get(xfs_da_args_t *args)
1991 {
1992 xfs_bmbt_irec_t map[ATTR_RMTVALUE_MAPSIZE];
1993 xfs_mount_t *mp;
1994 xfs_daddr_t dblkno;
1995 xfs_caddr_t dst;
1996 xfs_buf_t *bp;
1997 int nmap, error, tmp, valuelen, blkcnt, i;
1998 xfs_dablk_t lblkno;
1999
2000 ASSERT(!(args->flags & ATTR_KERNOVAL));
2001
2002 mp = args->dp->i_mount;
2003 dst = args->value;
2004 valuelen = args->valuelen;
2005 lblkno = args->rmtblkno;
2006 while (valuelen > 0) {
2007 nmap = ATTR_RMTVALUE_MAPSIZE;
2008 error = xfs_bmapi(args->trans, args->dp, (xfs_fileoff_t)lblkno,
2009 args->rmtblkcnt,
2010 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2011 NULL, 0, map, &nmap, NULL, NULL);
2012 if (error)
2013 return(error);
2014 ASSERT(nmap >= 1);
2015
2016 for (i = 0; (i < nmap) && (valuelen > 0); i++) {
2017 ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) &&
2018 (map[i].br_startblock != HOLESTARTBLOCK));
2019 dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock);
2020 blkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
2021 error = xfs_read_buf(mp, mp->m_ddev_targp, dblkno,
2022 blkcnt, XFS_BUF_LOCK, &bp);
2023 if (error)
2024 return(error);
2025
2026 tmp = (valuelen < XFS_BUF_SIZE(bp))
2027 ? valuelen : XFS_BUF_SIZE(bp);
2028 xfs_biomove(bp, 0, tmp, dst, XFS_B_READ);
2029 xfs_buf_relse(bp);
2030 dst += tmp;
2031 valuelen -= tmp;
2032
2033 lblkno += map[i].br_blockcount;
2034 }
2035 }
2036 ASSERT(valuelen == 0);
2037 return(0);
2038 }
2039
2040 /*
2041 * Write the value associated with an attribute into the out-of-line buffer
2042 * that we have defined for it.
2043 */
2044 STATIC int
2045 xfs_attr_rmtval_set(xfs_da_args_t *args)
2046 {
2047 xfs_mount_t *mp;
2048 xfs_fileoff_t lfileoff;
2049 xfs_inode_t *dp;
2050 xfs_bmbt_irec_t map;
2051 xfs_daddr_t dblkno;
2052 xfs_caddr_t src;
2053 xfs_buf_t *bp;
2054 xfs_dablk_t lblkno;
2055 int blkcnt, valuelen, nmap, error, tmp, committed;
2056
2057 dp = args->dp;
2058 mp = dp->i_mount;
2059 src = args->value;
2060
2061 /*
2062 * Find a "hole" in the attribute address space large enough for
2063 * us to drop the new attribute's value into.
2064 */
2065 blkcnt = XFS_B_TO_FSB(mp, args->valuelen);
2066 lfileoff = 0;
2067 error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff,
2068 XFS_ATTR_FORK);
2069 if (error) {
2070 return(error);
2071 }
2072 args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff;
2073 args->rmtblkcnt = blkcnt;
2074
2075 /*
2076 * Roll through the "value", allocating blocks on disk as required.
2077 */
2078 while (blkcnt > 0) {
2079 /*
2080 * Allocate a single extent, up to the size of the value.
2081 */
2082 XFS_BMAP_INIT(args->flist, args->firstblock);
2083 nmap = 1;
2084 error = xfs_bmapi(args->trans, dp, (xfs_fileoff_t)lblkno,
2085 blkcnt,
2086 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA |
2087 XFS_BMAPI_WRITE,
2088 args->firstblock, args->total, &map, &nmap,
2089 args->flist, NULL);
2090 if (!error) {
2091 error = xfs_bmap_finish(&args->trans, args->flist,
2092 &committed);
2093 }
2094 if (error) {
2095 ASSERT(committed);
2096 args->trans = NULL;
2097 xfs_bmap_cancel(args->flist);
2098 return(error);
2099 }
2100
2101 /*
2102 * bmap_finish() may have committed the last trans and started
2103 * a new one. We need the inode to be in all transactions.
2104 */
2105 if (committed) {
2106 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
2107 xfs_trans_ihold(args->trans, dp);
2108 }
2109
2110 ASSERT(nmap == 1);
2111 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2112 (map.br_startblock != HOLESTARTBLOCK));
2113 lblkno += map.br_blockcount;
2114 blkcnt -= map.br_blockcount;
2115
2116 /*
2117 * Start the next trans in the chain.
2118 */
2119 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
2120 return (error);
2121 }
2122
2123 /*
2124 * Roll through the "value", copying the attribute value to the
2125 * already-allocated blocks. Blocks are written synchronously
2126 * so that we can know they are all on disk before we turn off
2127 * the INCOMPLETE flag.
2128 */
2129 lblkno = args->rmtblkno;
2130 valuelen = args->valuelen;
2131 while (valuelen > 0) {
2132 /*
2133 * Try to remember where we decided to put the value.
2134 */
2135 XFS_BMAP_INIT(args->flist, args->firstblock);
2136 nmap = 1;
2137 error = xfs_bmapi(NULL, dp, (xfs_fileoff_t)lblkno,
2138 args->rmtblkcnt,
2139 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2140 args->firstblock, 0, &map, &nmap,
2141 NULL, NULL);
2142 if (error) {
2143 return(error);
2144 }
2145 ASSERT(nmap == 1);
2146 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2147 (map.br_startblock != HOLESTARTBLOCK));
2148
2149 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
2150 blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
2151
2152 bp = xfs_buf_get_flags(mp->m_ddev_targp, dblkno,
2153 blkcnt, XFS_BUF_LOCK);
2154 ASSERT(bp);
2155 ASSERT(!XFS_BUF_GETERROR(bp));
2156
2157 tmp = (valuelen < XFS_BUF_SIZE(bp)) ? valuelen :
2158 XFS_BUF_SIZE(bp);
2159 xfs_biomove(bp, 0, tmp, src, XFS_B_WRITE);
2160 if (tmp < XFS_BUF_SIZE(bp))
2161 xfs_biozero(bp, tmp, XFS_BUF_SIZE(bp) - tmp);
2162 if ((error = xfs_bwrite(mp, bp))) {/* GROT: NOTE: synchronous write */
2163 return (error);
2164 }
2165 src += tmp;
2166 valuelen -= tmp;
2167
2168 lblkno += map.br_blockcount;
2169 }
2170 ASSERT(valuelen == 0);
2171 return(0);
2172 }
2173
2174 /*
2175 * Remove the value associated with an attribute by deleting the
2176 * out-of-line buffer that it is stored on.
2177 */
2178 STATIC int
2179 xfs_attr_rmtval_remove(xfs_da_args_t *args)
2180 {
2181 xfs_mount_t *mp;
2182 xfs_bmbt_irec_t map;
2183 xfs_buf_t *bp;
2184 xfs_daddr_t dblkno;
2185 xfs_dablk_t lblkno;
2186 int valuelen, blkcnt, nmap, error, done, committed;
2187
2188 mp = args->dp->i_mount;
2189
2190 /*
2191 * Roll through the "value", invalidating the attribute value's
2192 * blocks.
2193 */
2194 lblkno = args->rmtblkno;
2195 valuelen = args->rmtblkcnt;
2196 while (valuelen > 0) {
2197 /*
2198 * Try to remember where we decided to put the value.
2199 */
2200 XFS_BMAP_INIT(args->flist, args->firstblock);
2201 nmap = 1;
2202 error = xfs_bmapi(NULL, args->dp, (xfs_fileoff_t)lblkno,
2203 args->rmtblkcnt,
2204 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2205 args->firstblock, 0, &map, &nmap,
2206 args->flist, NULL);
2207 if (error) {
2208 return(error);
2209 }
2210 ASSERT(nmap == 1);
2211 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2212 (map.br_startblock != HOLESTARTBLOCK));
2213
2214 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
2215 blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
2216
2217 /*
2218 * If the "remote" value is in the cache, remove it.
2219 */
2220 bp = xfs_incore(mp->m_ddev_targp, dblkno, blkcnt,
2221 XFS_INCORE_TRYLOCK);
2222 if (bp) {
2223 XFS_BUF_STALE(bp);
2224 XFS_BUF_UNDELAYWRITE(bp);
2225 xfs_buf_relse(bp);
2226 bp = NULL;
2227 }
2228
2229 valuelen -= map.br_blockcount;
2230
2231 lblkno += map.br_blockcount;
2232 }
2233
2234 /*
2235 * Keep de-allocating extents until the remote-value region is gone.
2236 */
2237 lblkno = args->rmtblkno;
2238 blkcnt = args->rmtblkcnt;
2239 done = 0;
2240 while (!done) {
2241 XFS_BMAP_INIT(args->flist, args->firstblock);
2242 error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt,
2243 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2244 1, args->firstblock, args->flist,
2245 NULL, &done);
2246 if (!error) {
2247 error = xfs_bmap_finish(&args->trans, args->flist,
2248 &committed);
2249 }
2250 if (error) {
2251 ASSERT(committed);
2252 args->trans = NULL;
2253 xfs_bmap_cancel(args->flist);
2254 return(error);
2255 }
2256
2257 /*
2258 * bmap_finish() may have committed the last trans and started
2259 * a new one. We need the inode to be in all transactions.
2260 */
2261 if (committed) {
2262 xfs_trans_ijoin(args->trans, args->dp, XFS_ILOCK_EXCL);
2263 xfs_trans_ihold(args->trans, args->dp);
2264 }
2265
2266 /*
2267 * Close out trans and start the next one in the chain.
2268 */
2269 if ((error = xfs_attr_rolltrans(&args->trans, args->dp)))
2270 return (error);
2271 }
2272 return(0);
2273 }
2274
2275 #if defined(XFS_ATTR_TRACE)
2276 /*
2277 * Add a trace buffer entry for an attr_list context structure.
2278 */
2279 void
2280 xfs_attr_trace_l_c(char *where, struct xfs_attr_list_context *context)
2281 {
2282 xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_C, where,
2283 (__psunsigned_t)context->dp,
2284 (__psunsigned_t)context->cursor->hashval,
2285 (__psunsigned_t)context->cursor->blkno,
2286 (__psunsigned_t)context->cursor->offset,
2287 (__psunsigned_t)context->alist,
2288 (__psunsigned_t)context->bufsize,
2289 (__psunsigned_t)context->count,
2290 (__psunsigned_t)context->firstu,
2291 (__psunsigned_t)
2292 ((context->count > 0) &&
2293 !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2294 ? (ATTR_ENTRY(context->alist,
2295 context->count-1)->a_valuelen)
2296 : 0,
2297 (__psunsigned_t)context->dupcnt,
2298 (__psunsigned_t)context->flags,
2299 (__psunsigned_t)NULL,
2300 (__psunsigned_t)NULL,
2301 (__psunsigned_t)NULL);
2302 }
2303
2304 /*
2305 * Add a trace buffer entry for a context structure and a Btree node.
2306 */
2307 void
2308 xfs_attr_trace_l_cn(char *where, struct xfs_attr_list_context *context,
2309 struct xfs_da_intnode *node)
2310 {
2311 xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CN, where,
2312 (__psunsigned_t)context->dp,
2313 (__psunsigned_t)context->cursor->hashval,
2314 (__psunsigned_t)context->cursor->blkno,
2315 (__psunsigned_t)context->cursor->offset,
2316 (__psunsigned_t)context->alist,
2317 (__psunsigned_t)context->bufsize,
2318 (__psunsigned_t)context->count,
2319 (__psunsigned_t)context->firstu,
2320 (__psunsigned_t)
2321 ((context->count > 0) &&
2322 !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2323 ? (ATTR_ENTRY(context->alist,
2324 context->count-1)->a_valuelen)
2325 : 0,
2326 (__psunsigned_t)context->dupcnt,
2327 (__psunsigned_t)context->flags,
2328 (__psunsigned_t)be16_to_cpu(node->hdr.count),
2329 (__psunsigned_t)be32_to_cpu(node->btree[0].hashval),
2330 (__psunsigned_t)be32_to_cpu(node->btree[
2331 be16_to_cpu(node->hdr.count)-1].hashval));
2332 }
2333
2334 /*
2335 * Add a trace buffer entry for a context structure and a Btree element.
2336 */
2337 void
2338 xfs_attr_trace_l_cb(char *where, struct xfs_attr_list_context *context,
2339 struct xfs_da_node_entry *btree)
2340 {
2341 xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CB, where,
2342 (__psunsigned_t)context->dp,
2343 (__psunsigned_t)context->cursor->hashval,
2344 (__psunsigned_t)context->cursor->blkno,
2345 (__psunsigned_t)context->cursor->offset,
2346 (__psunsigned_t)context->alist,
2347 (__psunsigned_t)context->bufsize,
2348 (__psunsigned_t)context->count,
2349 (__psunsigned_t)context->firstu,
2350 (__psunsigned_t)
2351 ((context->count > 0) &&
2352 !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2353 ? (ATTR_ENTRY(context->alist,
2354 context->count-1)->a_valuelen)
2355 : 0,
2356 (__psunsigned_t)context->dupcnt,
2357 (__psunsigned_t)context->flags,
2358 (__psunsigned_t)be32_to_cpu(btree->hashval),
2359 (__psunsigned_t)be32_to_cpu(btree->before),
2360 (__psunsigned_t)NULL);
2361 }
2362
2363 /*
2364 * Add a trace buffer entry for a context structure and a leaf block.
2365 */
2366 void
2367 xfs_attr_trace_l_cl(char *where, struct xfs_attr_list_context *context,
2368 struct xfs_attr_leafblock *leaf)
2369 {
2370 xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CL, where,
2371 (__psunsigned_t)context->dp,
2372 (__psunsigned_t)context->cursor->hashval,
2373 (__psunsigned_t)context->cursor->blkno,
2374 (__psunsigned_t)context->cursor->offset,
2375 (__psunsigned_t)context->alist,
2376 (__psunsigned_t)context->bufsize,
2377 (__psunsigned_t)context->count,
2378 (__psunsigned_t)context->firstu,
2379 (__psunsigned_t)
2380 ((context->count > 0) &&
2381 !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2382 ? (ATTR_ENTRY(context->alist,
2383 context->count-1)->a_valuelen)
2384 : 0,
2385 (__psunsigned_t)context->dupcnt,
2386 (__psunsigned_t)context->flags,
2387 (__psunsigned_t)be16_to_cpu(leaf->hdr.count),
2388 (__psunsigned_t)be32_to_cpu(leaf->entries[0].hashval),
2389 (__psunsigned_t)be32_to_cpu(leaf->entries[
2390 be16_to_cpu(leaf->hdr.count)-1].hashval));
2391 }
2392
2393 /*
2394 * Add a trace buffer entry for the arguments given to the routine,
2395 * generic form.
2396 */
2397 void
2398 xfs_attr_trace_enter(int type, char *where,
2399 __psunsigned_t a2, __psunsigned_t a3,
2400 __psunsigned_t a4, __psunsigned_t a5,
2401 __psunsigned_t a6, __psunsigned_t a7,
2402 __psunsigned_t a8, __psunsigned_t a9,
2403 __psunsigned_t a10, __psunsigned_t a11,
2404 __psunsigned_t a12, __psunsigned_t a13,
2405 __psunsigned_t a14, __psunsigned_t a15)
2406 {
2407 ASSERT(xfs_attr_trace_buf);
2408 ktrace_enter(xfs_attr_trace_buf, (void *)((__psunsigned_t)type),
2409 (void *)where,
2410 (void *)a2, (void *)a3, (void *)a4,
2411 (void *)a5, (void *)a6, (void *)a7,
2412 (void *)a8, (void *)a9, (void *)a10,
2413 (void *)a11, (void *)a12, (void *)a13,
2414 (void *)a14, (void *)a15);
2415 }
2416 #endif /* XFS_ATTR_TRACE */
2417
2418
2419 /*========================================================================
2420 * System (pseudo) namespace attribute interface routines.
2421 *========================================================================*/
2422
2423 STATIC int
2424 posix_acl_access_set(
2425 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2426 {
2427 return xfs_acl_vset(vp, data, size, _ACL_TYPE_ACCESS);
2428 }
2429
2430 STATIC int
2431 posix_acl_access_remove(
2432 bhv_vnode_t *vp, char *name, int xflags)
2433 {
2434 return xfs_acl_vremove(vp, _ACL_TYPE_ACCESS);
2435 }
2436
2437 STATIC int
2438 posix_acl_access_get(
2439 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2440 {
2441 return xfs_acl_vget(vp, data, size, _ACL_TYPE_ACCESS);
2442 }
2443
2444 STATIC int
2445 posix_acl_access_exists(
2446 bhv_vnode_t *vp)
2447 {
2448 return xfs_acl_vhasacl_access(vp);
2449 }
2450
2451 STATIC int
2452 posix_acl_default_set(
2453 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2454 {
2455 return xfs_acl_vset(vp, data, size, _ACL_TYPE_DEFAULT);
2456 }
2457
2458 STATIC int
2459 posix_acl_default_get(
2460 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2461 {
2462 return xfs_acl_vget(vp, data, size, _ACL_TYPE_DEFAULT);
2463 }
2464
2465 STATIC int
2466 posix_acl_default_remove(
2467 bhv_vnode_t *vp, char *name, int xflags)
2468 {
2469 return xfs_acl_vremove(vp, _ACL_TYPE_DEFAULT);
2470 }
2471
2472 STATIC int
2473 posix_acl_default_exists(
2474 bhv_vnode_t *vp)
2475 {
2476 return xfs_acl_vhasacl_default(vp);
2477 }
2478
2479 static struct attrnames posix_acl_access = {
2480 .attr_name = "posix_acl_access",
2481 .attr_namelen = sizeof("posix_acl_access") - 1,
2482 .attr_get = posix_acl_access_get,
2483 .attr_set = posix_acl_access_set,
2484 .attr_remove = posix_acl_access_remove,
2485 .attr_exists = posix_acl_access_exists,
2486 };
2487
2488 static struct attrnames posix_acl_default = {
2489 .attr_name = "posix_acl_default",
2490 .attr_namelen = sizeof("posix_acl_default") - 1,
2491 .attr_get = posix_acl_default_get,
2492 .attr_set = posix_acl_default_set,
2493 .attr_remove = posix_acl_default_remove,
2494 .attr_exists = posix_acl_default_exists,
2495 };
2496
2497 static struct attrnames *attr_system_names[] =
2498 { &posix_acl_access, &posix_acl_default };
2499
2500
2501 /*========================================================================
2502 * Namespace-prefix-style attribute name interface routines.
2503 *========================================================================*/
2504
2505 STATIC int
2506 attr_generic_set(
2507 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2508 {
2509 return -bhv_vop_attr_set(vp, name, data, size, xflags, NULL);
2510 }
2511
2512 STATIC int
2513 attr_generic_get(
2514 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2515 {
2516 int error, asize = size;
2517
2518 error = bhv_vop_attr_get(vp, name, data, &asize, xflags, NULL);
2519 if (!error)
2520 return asize;
2521 return -error;
2522 }
2523
2524 STATIC int
2525 attr_generic_remove(
2526 bhv_vnode_t *vp, char *name, int xflags)
2527 {
2528 return -bhv_vop_attr_remove(vp, name, xflags, NULL);
2529 }
2530
2531 STATIC int
2532 attr_generic_listadd(
2533 attrnames_t *prefix,
2534 attrnames_t *namesp,
2535 void *data,
2536 size_t size,
2537 ssize_t *result)
2538 {
2539 char *p = data + *result;
2540
2541 *result += prefix->attr_namelen;
2542 *result += namesp->attr_namelen + 1;
2543 if (!size)
2544 return 0;
2545 if (*result > size)
2546 return -ERANGE;
2547 strcpy(p, prefix->attr_name);
2548 p += prefix->attr_namelen;
2549 strcpy(p, namesp->attr_name);
2550 p += namesp->attr_namelen + 1;
2551 return 0;
2552 }
2553
2554 STATIC int
2555 attr_system_list(
2556 bhv_vnode_t *vp,
2557 void *data,
2558 size_t size,
2559 ssize_t *result)
2560 {
2561 attrnames_t *namesp;
2562 int i, error = 0;
2563
2564 for (i = 0; i < ATTR_SYSCOUNT; i++) {
2565 namesp = attr_system_names[i];
2566 if (!namesp->attr_exists || !namesp->attr_exists(vp))
2567 continue;
2568 error = attr_generic_listadd(&attr_system, namesp,
2569 data, size, result);
2570 if (error)
2571 break;
2572 }
2573 return error;
2574 }
2575
2576 int
2577 attr_generic_list(
2578 bhv_vnode_t *vp, void *data, size_t size, int xflags, ssize_t *result)
2579 {
2580 attrlist_cursor_kern_t cursor = { 0 };
2581 int error;
2582
2583 error = bhv_vop_attr_list(vp, data, size, xflags, &cursor, NULL);
2584 if (error > 0)
2585 return -error;
2586 *result = -error;
2587 return attr_system_list(vp, data, size, result);
2588 }
2589
2590 attrnames_t *
2591 attr_lookup_namespace(
2592 char *name,
2593 struct attrnames **names,
2594 int nnames)
2595 {
2596 int i;
2597
2598 for (i = 0; i < nnames; i++)
2599 if (!strncmp(name, names[i]->attr_name, names[i]->attr_namelen))
2600 return names[i];
2601 return NULL;
2602 }
2603
2604 /*
2605 * Some checks to prevent people abusing EAs to get over quota:
2606 * - Don't allow modifying user EAs on devices/symlinks;
2607 * - Don't allow modifying user EAs if sticky bit set;
2608 */
2609 STATIC int
2610 attr_user_capable(
2611 bhv_vnode_t *vp,
2612 cred_t *cred)
2613 {
2614 struct inode *inode = vn_to_inode(vp);
2615
2616 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
2617 return -EPERM;
2618 if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode) &&
2619 !capable(CAP_SYS_ADMIN))
2620 return -EPERM;
2621 if (S_ISDIR(inode->i_mode) && (inode->i_mode & S_ISVTX) &&
2622 (current_fsuid(cred) != inode->i_uid) && !capable(CAP_FOWNER))
2623 return -EPERM;
2624 return 0;
2625 }
2626
2627 STATIC int
2628 attr_trusted_capable(
2629 bhv_vnode_t *vp,
2630 cred_t *cred)
2631 {
2632 struct inode *inode = vn_to_inode(vp);
2633
2634 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
2635 return -EPERM;
2636 if (!capable(CAP_SYS_ADMIN))
2637 return -EPERM;
2638 return 0;
2639 }
2640
2641 STATIC int
2642 attr_secure_capable(
2643 bhv_vnode_t *vp,
2644 cred_t *cred)
2645 {
2646 return -ENOSECURITY;
2647 }
2648
2649 STATIC int
2650 attr_system_set(
2651 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2652 {
2653 attrnames_t *namesp;
2654 int error;
2655
2656 if (xflags & ATTR_CREATE)
2657 return -EINVAL;
2658
2659 namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT);
2660 if (!namesp)
2661 return -EOPNOTSUPP;
2662 error = namesp->attr_set(vp, name, data, size, xflags);
2663 if (!error)
2664 error = vn_revalidate(vp);
2665 return error;
2666 }
2667
2668 STATIC int
2669 attr_system_get(
2670 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2671 {
2672 attrnames_t *namesp;
2673
2674 namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT);
2675 if (!namesp)
2676 return -EOPNOTSUPP;
2677 return namesp->attr_get(vp, name, data, size, xflags);
2678 }
2679
2680 STATIC int
2681 attr_system_remove(
2682 bhv_vnode_t *vp, char *name, int xflags)
2683 {
2684 attrnames_t *namesp;
2685
2686 namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT);
2687 if (!namesp)
2688 return -EOPNOTSUPP;
2689 return namesp->attr_remove(vp, name, xflags);
2690 }
2691
2692 struct attrnames attr_system = {
2693 .attr_name = "system.",
2694 .attr_namelen = sizeof("system.") - 1,
2695 .attr_flag = ATTR_SYSTEM,
2696 .attr_get = attr_system_get,
2697 .attr_set = attr_system_set,
2698 .attr_remove = attr_system_remove,
2699 .attr_capable = (attrcapable_t)fs_noerr,
2700 };
2701
2702 struct attrnames attr_trusted = {
2703 .attr_name = "trusted.",
2704 .attr_namelen = sizeof("trusted.") - 1,
2705 .attr_flag = ATTR_ROOT,
2706 .attr_get = attr_generic_get,
2707 .attr_set = attr_generic_set,
2708 .attr_remove = attr_generic_remove,
2709 .attr_capable = attr_trusted_capable,
2710 };
2711
2712 struct attrnames attr_secure = {
2713 .attr_name = "security.",
2714 .attr_namelen = sizeof("security.") - 1,
2715 .attr_flag = ATTR_SECURE,
2716 .attr_get = attr_generic_get,
2717 .attr_set = attr_generic_set,
2718 .attr_remove = attr_generic_remove,
2719 .attr_capable = attr_secure_capable,
2720 };
2721
2722 struct attrnames attr_user = {
2723 .attr_name = "user.",
2724 .attr_namelen = sizeof("user.") - 1,
2725 .attr_get = attr_generic_get,
2726 .attr_set = attr_generic_set,
2727 .attr_remove = attr_generic_remove,
2728 .attr_capable = attr_user_capable,
2729 };
2730
2731 struct attrnames *attr_namespaces[] =
2732 { &attr_system, &attr_trusted, &attr_secure, &attr_user };
WRT350N Kernel Patches