?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
shmem_file_write is redundant
[wrt350n-kernel.git] / fs / xfs / xfs_attr.c
blob93fa64dd1be6ab49287bc5a1e8a4659767fa20f0
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 #include "xfs_vnodeops.h"
53
54 /*
55 * xfs_attr.c
56 *
57 * Provide the external interfaces to manage attribute lists.
58 */
59
60 #define ATTR_SYSCOUNT 2
61 static struct attrnames posix_acl_access;
62 static struct attrnames posix_acl_default;
63 static struct attrnames *attr_system_names[ATTR_SYSCOUNT];
64
65 /*========================================================================
66 * Function prototypes for the kernel.
67 *========================================================================*/
68
69 /*
70 * Internal routines when attribute list fits inside the inode.
71 */
72 STATIC int xfs_attr_shortform_addname(xfs_da_args_t *args);
73
74 /*
75 * Internal routines when attribute list is one block.
76 */
77 STATIC int xfs_attr_leaf_get(xfs_da_args_t *args);
78 STATIC int xfs_attr_leaf_addname(xfs_da_args_t *args);
79 STATIC int xfs_attr_leaf_removename(xfs_da_args_t *args);
80 STATIC int xfs_attr_leaf_list(xfs_attr_list_context_t *context);
81
82 /*
83 * Internal routines when attribute list is more than one block.
84 */
85 STATIC int xfs_attr_node_get(xfs_da_args_t *args);
86 STATIC int xfs_attr_node_addname(xfs_da_args_t *args);
87 STATIC int xfs_attr_node_removename(xfs_da_args_t *args);
88 STATIC int xfs_attr_node_list(xfs_attr_list_context_t *context);
89 STATIC int xfs_attr_fillstate(xfs_da_state_t *state);
90 STATIC int xfs_attr_refillstate(xfs_da_state_t *state);
91
92 /*
93 * Routines to manipulate out-of-line attribute values.
94 */
95 STATIC int xfs_attr_rmtval_set(xfs_da_args_t *args);
96 STATIC int xfs_attr_rmtval_remove(xfs_da_args_t *args);
97
98 #define ATTR_RMTVALUE_MAPSIZE 1 /* # of map entries at once */
99
100 #if defined(XFS_ATTR_TRACE)
101 ktrace_t *xfs_attr_trace_buf;
102 #endif
103
104
105 /*========================================================================
106 * Overall external interface routines.
107 *========================================================================*/
108
109 int
110 xfs_attr_fetch(xfs_inode_t *ip, const char *name, int namelen,
111 char *value, int *valuelenp, int flags, struct cred *cred)
112 {
113 xfs_da_args_t args;
114 int error;
115
116 if ((XFS_IFORK_Q(ip) == 0) ||
117 (ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
118 ip->i_d.di_anextents == 0))
119 return(ENOATTR);
120
121 /*
122 * Fill in the arg structure for this request.
123 */
124 memset((char *)&args, 0, sizeof(args));
125 args.name = name;
126 args.namelen = namelen;
127 args.value = value;
128 args.valuelen = *valuelenp;
129 args.flags = flags;
130 args.hashval = xfs_da_hashname(args.name, args.namelen);
131 args.dp = ip;
132 args.whichfork = XFS_ATTR_FORK;
133
134 /*
135 * Decide on what work routines to call based on the inode size.
136 */
137 if (XFS_IFORK_Q(ip) == 0 ||
138 (ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
139 ip->i_d.di_anextents == 0)) {
140 error = XFS_ERROR(ENOATTR);
141 } else if (ip->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
142 error = xfs_attr_shortform_getvalue(&args);
143 } else if (xfs_bmap_one_block(ip, XFS_ATTR_FORK)) {
144 error = xfs_attr_leaf_get(&args);
145 } else {
146 error = xfs_attr_node_get(&args);
147 }
148
149 /*
150 * Return the number of bytes in the value to the caller.
151 */
152 *valuelenp = args.valuelen;
153
154 if (error == EEXIST)
155 error = 0;
156 return(error);
157 }
158
159 int
160 xfs_attr_get(
161 xfs_inode_t *ip,
162 const char *name,
163 char *value,
164 int *valuelenp,
165 int flags,
166 cred_t *cred)
167 {
168 int error, namelen;
169
170 XFS_STATS_INC(xs_attr_get);
171
172 if (!name)
173 return(EINVAL);
174 namelen = strlen(name);
175 if (namelen >= MAXNAMELEN)
176 return(EFAULT); /* match IRIX behaviour */
177
178 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
179 return(EIO);
180
181 xfs_ilock(ip, XFS_ILOCK_SHARED);
182 error = xfs_attr_fetch(ip, name, namelen, value, valuelenp, flags, cred);
183 xfs_iunlock(ip, XFS_ILOCK_SHARED);
184 return(error);
185 }
186
187 int
188 xfs_attr_set_int(xfs_inode_t *dp, const char *name, int namelen,
189 char *value, int valuelen, int flags)
190 {
191 xfs_da_args_t args;
192 xfs_fsblock_t firstblock;
193 xfs_bmap_free_t flist;
194 int error, err2, committed;
195 int local, size;
196 uint nblks;
197 xfs_mount_t *mp = dp->i_mount;
198 int rsvd = (flags & ATTR_ROOT) != 0;
199
200 /*
201 * Attach the dquots to the inode.
202 */
203 if ((error = XFS_QM_DQATTACH(mp, dp, 0)))
204 return (error);
205
206 /*
207 * If the inode doesn't have an attribute fork, add one.
208 * (inode must not be locked when we call this routine)
209 */
210 if (XFS_IFORK_Q(dp) == 0) {
211 int sf_size = sizeof(xfs_attr_sf_hdr_t) +
212 XFS_ATTR_SF_ENTSIZE_BYNAME(namelen, valuelen);
213
214 if ((error = xfs_bmap_add_attrfork(dp, sf_size, rsvd)))
215 return(error);
216 }
217
218 /*
219 * Fill in the arg structure for this request.
220 */
221 memset((char *)&args, 0, sizeof(args));
222 args.name = name;
223 args.namelen = namelen;
224 args.value = value;
225 args.valuelen = valuelen;
226 args.flags = flags;
227 args.hashval = xfs_da_hashname(args.name, args.namelen);
228 args.dp = dp;
229 args.firstblock = &firstblock;
230 args.flist = &flist;
231 args.whichfork = XFS_ATTR_FORK;
232 args.addname = 1;
233 args.oknoent = 1;
234
235 /*
236 * Determine space new attribute will use, and if it would be
237 * "local" or "remote" (note: local != inline).
238 */
239 size = xfs_attr_leaf_newentsize(namelen, valuelen,
240 mp->m_sb.sb_blocksize, &local);
241
242 nblks = XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK);
243 if (local) {
244 if (size > (mp->m_sb.sb_blocksize >> 1)) {
245 /* Double split possible */
246 nblks <<= 1;
247 }
248 } else {
249 uint dblocks = XFS_B_TO_FSB(mp, valuelen);
250 /* Out of line attribute, cannot double split, but make
251 * room for the attribute value itself.
252 */
253 nblks += dblocks;
254 nblks += XFS_NEXTENTADD_SPACE_RES(mp, dblocks, XFS_ATTR_FORK);
255 }
256
257 /* Size is now blocks for attribute data */
258 args.total = nblks;
259
260 /*
261 * Start our first transaction of the day.
262 *
263 * All future transactions during this code must be "chained" off
264 * this one via the trans_dup() call. All transactions will contain
265 * the inode, and the inode will always be marked with trans_ihold().
266 * Since the inode will be locked in all transactions, we must log
267 * the inode in every transaction to let it float upward through
268 * the log.
269 */
270 args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_SET);
271
272 /*
273 * Root fork attributes can use reserved data blocks for this
274 * operation if necessary
275 */
276
277 if (rsvd)
278 args.trans->t_flags |= XFS_TRANS_RESERVE;
279
280 if ((error = xfs_trans_reserve(args.trans, (uint) nblks,
281 XFS_ATTRSET_LOG_RES(mp, nblks),
282 0, XFS_TRANS_PERM_LOG_RES,
283 XFS_ATTRSET_LOG_COUNT))) {
284 xfs_trans_cancel(args.trans, 0);
285 return(error);
286 }
287 xfs_ilock(dp, XFS_ILOCK_EXCL);
288
289 error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, args.trans, dp, nblks, 0,
290 rsvd ? XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
291 XFS_QMOPT_RES_REGBLKS);
292 if (error) {
293 xfs_iunlock(dp, XFS_ILOCK_EXCL);
294 xfs_trans_cancel(args.trans, XFS_TRANS_RELEASE_LOG_RES);
295 return (error);
296 }
297
298 xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
299 xfs_trans_ihold(args.trans, dp);
300
301 /*
302 * If the attribute list is non-existent or a shortform list,
303 * upgrade it to a single-leaf-block attribute list.
304 */
305 if ((dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
306 ((dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS) &&
307 (dp->i_d.di_anextents == 0))) {
308
309 /*
310 * Build initial attribute list (if required).
311 */
312 if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS)
313 xfs_attr_shortform_create(&args);
314
315 /*
316 * Try to add the attr to the attribute list in
317 * the inode.
318 */
319 error = xfs_attr_shortform_addname(&args);
320 if (error != ENOSPC) {
321 /*
322 * Commit the shortform mods, and we're done.
323 * NOTE: this is also the error path (EEXIST, etc).
324 */
325 ASSERT(args.trans != NULL);
326
327 /*
328 * If this is a synchronous mount, make sure that
329 * the transaction goes to disk before returning
330 * to the user.
331 */
332 if (mp->m_flags & XFS_MOUNT_WSYNC) {
333 xfs_trans_set_sync(args.trans);
334 }
335 err2 = xfs_trans_commit(args.trans,
336 XFS_TRANS_RELEASE_LOG_RES);
337 xfs_iunlock(dp, XFS_ILOCK_EXCL);
338
339 /*
340 * Hit the inode change time.
341 */
342 if (!error && (flags & ATTR_KERNOTIME) == 0) {
343 xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
344 }
345 return(error == 0 ? err2 : error);
346 }
347
348 /*
349 * It won't fit in the shortform, transform to a leaf block.
350 * GROT: another possible req'mt for a double-split btree op.
351 */
352 XFS_BMAP_INIT(args.flist, args.firstblock);
353 error = xfs_attr_shortform_to_leaf(&args);
354 if (!error) {
355 error = xfs_bmap_finish(&args.trans, args.flist,
356 &committed);
357 }
358 if (error) {
359 ASSERT(committed);
360 args.trans = NULL;
361 xfs_bmap_cancel(&flist);
362 goto out;
363 }
364
365 /*
366 * bmap_finish() may have committed the last trans and started
367 * a new one. We need the inode to be in all transactions.
368 */
369 if (committed) {
370 xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
371 xfs_trans_ihold(args.trans, dp);
372 }
373
374 /*
375 * Commit the leaf transformation. We'll need another (linked)
376 * transaction to add the new attribute to the leaf.
377 */
378 if ((error = xfs_attr_rolltrans(&args.trans, dp)))
379 goto out;
380
381 }
382
383 if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
384 error = xfs_attr_leaf_addname(&args);
385 } else {
386 error = xfs_attr_node_addname(&args);
387 }
388 if (error) {
389 goto out;
390 }
391
392 /*
393 * If this is a synchronous mount, make sure that the
394 * transaction goes to disk before returning to the user.
395 */
396 if (mp->m_flags & XFS_MOUNT_WSYNC) {
397 xfs_trans_set_sync(args.trans);
398 }
399
400 /*
401 * Commit the last in the sequence of transactions.
402 */
403 xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
404 error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES);
405 xfs_iunlock(dp, XFS_ILOCK_EXCL);
406
407 /*
408 * Hit the inode change time.
409 */
410 if (!error && (flags & ATTR_KERNOTIME) == 0) {
411 xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
412 }
413
414 return(error);
415
416 out:
417 if (args.trans)
418 xfs_trans_cancel(args.trans,
419 XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
420 xfs_iunlock(dp, XFS_ILOCK_EXCL);
421 return(error);
422 }
423
424 int
425 xfs_attr_set(
426 xfs_inode_t *dp,
427 const char *name,
428 char *value,
429 int valuelen,
430 int flags)
431 {
432 int namelen;
433
434 namelen = strlen(name);
435 if (namelen >= MAXNAMELEN)
436 return EFAULT; /* match IRIX behaviour */
437
438 XFS_STATS_INC(xs_attr_set);
439
440 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
441 return (EIO);
442
443 return xfs_attr_set_int(dp, name, namelen, value, valuelen, flags);
444 }
445
446 /*
447 * Generic handler routine to remove a name from an attribute list.
448 * Transitions attribute list from Btree to shortform as necessary.
449 */
450 int
451 xfs_attr_remove_int(xfs_inode_t *dp, const char *name, int namelen, int flags)
452 {
453 xfs_da_args_t args;
454 xfs_fsblock_t firstblock;
455 xfs_bmap_free_t flist;
456 int error;
457 xfs_mount_t *mp = dp->i_mount;
458
459 /*
460 * Fill in the arg structure for this request.
461 */
462 memset((char *)&args, 0, sizeof(args));
463 args.name = name;
464 args.namelen = namelen;
465 args.flags = flags;
466 args.hashval = xfs_da_hashname(args.name, args.namelen);
467 args.dp = dp;
468 args.firstblock = &firstblock;
469 args.flist = &flist;
470 args.total = 0;
471 args.whichfork = XFS_ATTR_FORK;
472
473 /*
474 * Attach the dquots to the inode.
475 */
476 if ((error = XFS_QM_DQATTACH(mp, dp, 0)))
477 return (error);
478
479 /*
480 * Start our first transaction of the day.
481 *
482 * All future transactions during this code must be "chained" off
483 * this one via the trans_dup() call. All transactions will contain
484 * the inode, and the inode will always be marked with trans_ihold().
485 * Since the inode will be locked in all transactions, we must log
486 * the inode in every transaction to let it float upward through
487 * the log.
488 */
489 args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_RM);
490
491 /*
492 * Root fork attributes can use reserved data blocks for this
493 * operation if necessary
494 */
495
496 if (flags & ATTR_ROOT)
497 args.trans->t_flags |= XFS_TRANS_RESERVE;
498
499 if ((error = xfs_trans_reserve(args.trans,
500 XFS_ATTRRM_SPACE_RES(mp),
501 XFS_ATTRRM_LOG_RES(mp),
502 0, XFS_TRANS_PERM_LOG_RES,
503 XFS_ATTRRM_LOG_COUNT))) {
504 xfs_trans_cancel(args.trans, 0);
505 return(error);
506 }
507
508 xfs_ilock(dp, XFS_ILOCK_EXCL);
509 /*
510 * No need to make quota reservations here. We expect to release some
511 * blocks not allocate in the common case.
512 */
513 xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
514 xfs_trans_ihold(args.trans, dp);
515
516 /*
517 * Decide on what work routines to call based on the inode size.
518 */
519 if (XFS_IFORK_Q(dp) == 0 ||
520 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
521 dp->i_d.di_anextents == 0)) {
522 error = XFS_ERROR(ENOATTR);
523 goto out;
524 }
525 if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
526 ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
527 error = xfs_attr_shortform_remove(&args);
528 if (error) {
529 goto out;
530 }
531 } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
532 error = xfs_attr_leaf_removename(&args);
533 } else {
534 error = xfs_attr_node_removename(&args);
535 }
536 if (error) {
537 goto out;
538 }
539
540 /*
541 * If this is a synchronous mount, make sure that the
542 * transaction goes to disk before returning to the user.
543 */
544 if (mp->m_flags & XFS_MOUNT_WSYNC) {
545 xfs_trans_set_sync(args.trans);
546 }
547
548 /*
549 * Commit the last in the sequence of transactions.
550 */
551 xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
552 error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES);
553 xfs_iunlock(dp, XFS_ILOCK_EXCL);
554
555 /*
556 * Hit the inode change time.
557 */
558 if (!error && (flags & ATTR_KERNOTIME) == 0) {
559 xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
560 }
561
562 return(error);
563
564 out:
565 if (args.trans)
566 xfs_trans_cancel(args.trans,
567 XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
568 xfs_iunlock(dp, XFS_ILOCK_EXCL);
569 return(error);
570 }
571
572 int
573 xfs_attr_remove(
574 xfs_inode_t *dp,
575 const char *name,
576 int flags)
577 {
578 int namelen;
579
580 namelen = strlen(name);
581 if (namelen >= MAXNAMELEN)
582 return EFAULT; /* match IRIX behaviour */
583
584 XFS_STATS_INC(xs_attr_remove);
585
586 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
587 return (EIO);
588
589 xfs_ilock(dp, XFS_ILOCK_SHARED);
590 if (XFS_IFORK_Q(dp) == 0 ||
591 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
592 dp->i_d.di_anextents == 0)) {
593 xfs_iunlock(dp, XFS_ILOCK_SHARED);
594 return(XFS_ERROR(ENOATTR));
595 }
596 xfs_iunlock(dp, XFS_ILOCK_SHARED);
597
598 return xfs_attr_remove_int(dp, name, namelen, flags);
599 }
600
601 int /* error */
602 xfs_attr_list_int(xfs_attr_list_context_t *context)
603 {
604 int error;
605 xfs_inode_t *dp = context->dp;
606
607 /*
608 * Decide on what work routines to call based on the inode size.
609 */
610 if (XFS_IFORK_Q(dp) == 0 ||
611 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
612 dp->i_d.di_anextents == 0)) {
613 error = 0;
614 } else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
615 error = xfs_attr_shortform_list(context);
616 } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
617 error = xfs_attr_leaf_list(context);
618 } else {
619 error = xfs_attr_node_list(context);
620 }
621 return error;
622 }
623
624 #define ATTR_ENTBASESIZE /* minimum bytes used by an attr */ \
625 (((struct attrlist_ent *) 0)->a_name - (char *) 0)
626 #define ATTR_ENTSIZE(namelen) /* actual bytes used by an attr */ \
627 ((ATTR_ENTBASESIZE + (namelen) + 1 + sizeof(u_int32_t)-1) \
628 & ~(sizeof(u_int32_t)-1))
629
630 /*
631 * Format an attribute and copy it out to the user's buffer.
632 * Take care to check values and protect against them changing later,
633 * we may be reading them directly out of a user buffer.
634 */
635 /*ARGSUSED*/
636 STATIC int
637 xfs_attr_put_listent(xfs_attr_list_context_t *context, attrnames_t *namesp,
638 char *name, int namelen,
639 int valuelen, char *value)
640 {
641 attrlist_ent_t *aep;
642 int arraytop;
643
644 ASSERT(!(context->flags & ATTR_KERNOVAL));
645 ASSERT(context->count >= 0);
646 ASSERT(context->count < (ATTR_MAX_VALUELEN/8));
647 ASSERT(context->firstu >= sizeof(*context->alist));
648 ASSERT(context->firstu <= context->bufsize);
649
650 arraytop = sizeof(*context->alist) +
651 context->count * sizeof(context->alist->al_offset[0]);
652 context->firstu -= ATTR_ENTSIZE(namelen);
653 if (context->firstu < arraytop) {
654 xfs_attr_trace_l_c("buffer full", context);
655 context->alist->al_more = 1;
656 context->seen_enough = 1;
657 return 1;
658 }
659
660 aep = (attrlist_ent_t *)&(((char *)context->alist)[ context->firstu ]);
661 aep->a_valuelen = valuelen;
662 memcpy(aep->a_name, name, namelen);
663 aep->a_name[ namelen ] = 0;
664 context->alist->al_offset[ context->count++ ] = context->firstu;
665 context->alist->al_count = context->count;
666 xfs_attr_trace_l_c("add", context);
667 return 0;
668 }
669
670 STATIC int
671 xfs_attr_kern_list(xfs_attr_list_context_t *context, attrnames_t *namesp,
672 char *name, int namelen,
673 int valuelen, char *value)
674 {
675 char *offset;
676 int arraytop;
677
678 ASSERT(context->count >= 0);
679
680 arraytop = context->count + namesp->attr_namelen + namelen + 1;
681 if (arraytop > context->firstu) {
682 context->count = -1; /* insufficient space */
683 return 1;
684 }
685 offset = (char *)context->alist + context->count;
686 strncpy(offset, namesp->attr_name, namesp->attr_namelen);
687 offset += namesp->attr_namelen;
688 strncpy(offset, name, namelen); /* real name */
689 offset += namelen;
690 *offset = '\0';
691 context->count += namesp->attr_namelen + namelen + 1;
692 return 0;
693 }
694
695 /*ARGSUSED*/
696 STATIC int
697 xfs_attr_kern_list_sizes(xfs_attr_list_context_t *context, attrnames_t *namesp,
698 char *name, int namelen,
699 int valuelen, char *value)
700 {
701 context->count += namesp->attr_namelen + namelen + 1;
702 return 0;
703 }
704
705 /*
706 * Generate a list of extended attribute names and optionally
707 * also value lengths. Positive return value follows the XFS
708 * convention of being an error, zero or negative return code
709 * is the length of the buffer returned (negated), indicating
710 * success.
711 */
712 int
713 xfs_attr_list(
714 xfs_inode_t *dp,
715 char *buffer,
716 int bufsize,
717 int flags,
718 attrlist_cursor_kern_t *cursor)
719 {
720 xfs_attr_list_context_t context;
721 int error;
722
723 XFS_STATS_INC(xs_attr_list);
724
725 /*
726 * Validate the cursor.
727 */
728 if (cursor->pad1 || cursor->pad2)
729 return(XFS_ERROR(EINVAL));
730 if ((cursor->initted == 0) &&
731 (cursor->hashval || cursor->blkno || cursor->offset))
732 return XFS_ERROR(EINVAL);
733
734 /*
735 * Check for a properly aligned buffer.
736 */
737 if (((long)buffer) & (sizeof(int)-1))
738 return XFS_ERROR(EFAULT);
739 if (flags & ATTR_KERNOVAL)
740 bufsize = 0;
741
742 /*
743 * Initialize the output buffer.
744 */
745 context.dp = dp;
746 context.cursor = cursor;
747 context.count = 0;
748 context.dupcnt = 0;
749 context.resynch = 1;
750 context.flags = flags;
751 context.seen_enough = 0;
752 context.alist = (attrlist_t *)buffer;
753 context.put_value = 0;
754
755 if (flags & ATTR_KERNAMELS) {
756 context.bufsize = bufsize;
757 context.firstu = context.bufsize;
758 if (flags & ATTR_KERNOVAL)
759 context.put_listent = xfs_attr_kern_list_sizes;
760 else
761 context.put_listent = xfs_attr_kern_list;
762 } else {
763 context.bufsize = (bufsize & ~(sizeof(int)-1)); /* align */
764 context.firstu = context.bufsize;
765 context.alist->al_count = 0;
766 context.alist->al_more = 0;
767 context.alist->al_offset[0] = context.bufsize;
768 context.put_listent = xfs_attr_put_listent;
769 }
770
771 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
772 return EIO;
773
774 xfs_ilock(dp, XFS_ILOCK_SHARED);
775 xfs_attr_trace_l_c("syscall start", &context);
776
777 error = xfs_attr_list_int(&context);
778
779 xfs_iunlock(dp, XFS_ILOCK_SHARED);
780 xfs_attr_trace_l_c("syscall end", &context);
781
782 if (context.flags & (ATTR_KERNOVAL|ATTR_KERNAMELS)) {
783 /* must return negated buffer size or the error */
784 if (context.count < 0)
785 error = XFS_ERROR(ERANGE);
786 else
787 error = -context.count;
788 } else
789 ASSERT(error >= 0);
790
791 return error;
792 }
793
794 int /* error */
795 xfs_attr_inactive(xfs_inode_t *dp)
796 {
797 xfs_trans_t *trans;
798 xfs_mount_t *mp;
799 int error;
800
801 mp = dp->i_mount;
802 ASSERT(! XFS_NOT_DQATTACHED(mp, dp));
803
804 xfs_ilock(dp, XFS_ILOCK_SHARED);
805 if ((XFS_IFORK_Q(dp) == 0) ||
806 (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
807 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
808 dp->i_d.di_anextents == 0)) {
809 xfs_iunlock(dp, XFS_ILOCK_SHARED);
810 return(0);
811 }
812 xfs_iunlock(dp, XFS_ILOCK_SHARED);
813
814 /*
815 * Start our first transaction of the day.
816 *
817 * All future transactions during this code must be "chained" off
818 * this one via the trans_dup() call. All transactions will contain
819 * the inode, and the inode will always be marked with trans_ihold().
820 * Since the inode will be locked in all transactions, we must log
821 * the inode in every transaction to let it float upward through
822 * the log.
823 */
824 trans = xfs_trans_alloc(mp, XFS_TRANS_ATTRINVAL);
825 if ((error = xfs_trans_reserve(trans, 0, XFS_ATTRINVAL_LOG_RES(mp), 0,
826 XFS_TRANS_PERM_LOG_RES,
827 XFS_ATTRINVAL_LOG_COUNT))) {
828 xfs_trans_cancel(trans, 0);
829 return(error);
830 }
831 xfs_ilock(dp, XFS_ILOCK_EXCL);
832
833 /*
834 * No need to make quota reservations here. We expect to release some
835 * blocks, not allocate, in the common case.
836 */
837 xfs_trans_ijoin(trans, dp, XFS_ILOCK_EXCL);
838 xfs_trans_ihold(trans, dp);
839
840 /*
841 * Decide on what work routines to call based on the inode size.
842 */
843 if ((XFS_IFORK_Q(dp) == 0) ||
844 (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
845 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
846 dp->i_d.di_anextents == 0)) {
847 error = 0;
848 goto out;
849 }
850 error = xfs_attr_root_inactive(&trans, dp);
851 if (error)
852 goto out;
853 /*
854 * signal synchronous inactive transactions unless this
855 * is a synchronous mount filesystem in which case we
856 * know that we're here because we've been called out of
857 * xfs_inactive which means that the last reference is gone
858 * and the unlink transaction has already hit the disk so
859 * async inactive transactions are safe.
860 */
861 if ((error = xfs_itruncate_finish(&trans, dp, 0LL, XFS_ATTR_FORK,
862 (!(mp->m_flags & XFS_MOUNT_WSYNC)
863 ? 1 : 0))))
864 goto out;
865
866 /*
867 * Commit the last in the sequence of transactions.
868 */
869 xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
870 error = xfs_trans_commit(trans, XFS_TRANS_RELEASE_LOG_RES);
871 xfs_iunlock(dp, XFS_ILOCK_EXCL);
872
873 return(error);
874
875 out:
876 xfs_trans_cancel(trans, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
877 xfs_iunlock(dp, XFS_ILOCK_EXCL);
878 return(error);
879 }
880
881
882
883 /*========================================================================
884 * External routines when attribute list is inside the inode
885 *========================================================================*/
886
887 /*
888 * Add a name to the shortform attribute list structure
889 * This is the external routine.
890 */
891 STATIC int
892 xfs_attr_shortform_addname(xfs_da_args_t *args)
893 {
894 int newsize, forkoff, retval;
895
896 retval = xfs_attr_shortform_lookup(args);
897 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
898 return(retval);
899 } else if (retval == EEXIST) {
900 if (args->flags & ATTR_CREATE)
901 return(retval);
902 retval = xfs_attr_shortform_remove(args);
903 ASSERT(retval == 0);
904 }
905
906 if (args->namelen >= XFS_ATTR_SF_ENTSIZE_MAX ||
907 args->valuelen >= XFS_ATTR_SF_ENTSIZE_MAX)
908 return(XFS_ERROR(ENOSPC));
909
910 newsize = XFS_ATTR_SF_TOTSIZE(args->dp);
911 newsize += XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
912
913 forkoff = xfs_attr_shortform_bytesfit(args->dp, newsize);
914 if (!forkoff)
915 return(XFS_ERROR(ENOSPC));
916
917 xfs_attr_shortform_add(args, forkoff);
918 return(0);
919 }
920
921
922 /*========================================================================
923 * External routines when attribute list is one block
924 *========================================================================*/
925
926 /*
927 * Add a name to the leaf attribute list structure
928 *
929 * This leaf block cannot have a "remote" value, we only call this routine
930 * if bmap_one_block() says there is only one block (ie: no remote blks).
931 */
932 int
933 xfs_attr_leaf_addname(xfs_da_args_t *args)
934 {
935 xfs_inode_t *dp;
936 xfs_dabuf_t *bp;
937 int retval, error, committed, forkoff;
938
939 /*
940 * Read the (only) block in the attribute list in.
941 */
942 dp = args->dp;
943 args->blkno = 0;
944 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
945 XFS_ATTR_FORK);
946 if (error)
947 return(error);
948 ASSERT(bp != NULL);
949
950 /*
951 * Look up the given attribute in the leaf block. Figure out if
952 * the given flags produce an error or call for an atomic rename.
953 */
954 retval = xfs_attr_leaf_lookup_int(bp, args);
955 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
956 xfs_da_brelse(args->trans, bp);
957 return(retval);
958 } else if (retval == EEXIST) {
959 if (args->flags & ATTR_CREATE) { /* pure create op */
960 xfs_da_brelse(args->trans, bp);
961 return(retval);
962 }
963 args->rename = 1; /* an atomic rename */
964 args->blkno2 = args->blkno; /* set 2nd entry info*/
965 args->index2 = args->index;
966 args->rmtblkno2 = args->rmtblkno;
967 args->rmtblkcnt2 = args->rmtblkcnt;
968 }
969
970 /*
971 * Add the attribute to the leaf block, transitioning to a Btree
972 * if required.
973 */
974 retval = xfs_attr_leaf_add(bp, args);
975 xfs_da_buf_done(bp);
976 if (retval == ENOSPC) {
977 /*
978 * Promote the attribute list to the Btree format, then
979 * Commit that transaction so that the node_addname() call
980 * can manage its own transactions.
981 */
982 XFS_BMAP_INIT(args->flist, args->firstblock);
983 error = xfs_attr_leaf_to_node(args);
984 if (!error) {
985 error = xfs_bmap_finish(&args->trans, args->flist,
986 &committed);
987 }
988 if (error) {
989 ASSERT(committed);
990 args->trans = NULL;
991 xfs_bmap_cancel(args->flist);
992 return(error);
993 }
994
995 /*
996 * bmap_finish() may have committed the last trans and started
997 * a new one. We need the inode to be in all transactions.
998 */
999 if (committed) {
1000 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1001 xfs_trans_ihold(args->trans, dp);
1002 }
1003
1004 /*
1005 * Commit the current trans (including the inode) and start
1006 * a new one.
1007 */
1008 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1009 return (error);
1010
1011 /*
1012 * Fob the whole rest of the problem off on the Btree code.
1013 */
1014 error = xfs_attr_node_addname(args);
1015 return(error);
1016 }
1017
1018 /*
1019 * Commit the transaction that added the attr name so that
1020 * later routines can manage their own transactions.
1021 */
1022 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1023 return (error);
1024
1025 /*
1026 * If there was an out-of-line value, allocate the blocks we
1027 * identified for its storage and copy the value. This is done
1028 * after we create the attribute so that we don't overflow the
1029 * maximum size of a transaction and/or hit a deadlock.
1030 */
1031 if (args->rmtblkno > 0) {
1032 error = xfs_attr_rmtval_set(args);
1033 if (error)
1034 return(error);
1035 }
1036
1037 /*
1038 * If this is an atomic rename operation, we must "flip" the
1039 * incomplete flags on the "new" and "old" attribute/value pairs
1040 * so that one disappears and one appears atomically. Then we
1041 * must remove the "old" attribute/value pair.
1042 */
1043 if (args->rename) {
1044 /*
1045 * In a separate transaction, set the incomplete flag on the
1046 * "old" attr and clear the incomplete flag on the "new" attr.
1047 */
1048 error = xfs_attr_leaf_flipflags(args);
1049 if (error)
1050 return(error);
1051
1052 /*
1053 * Dismantle the "old" attribute/value pair by removing
1054 * a "remote" value (if it exists).
1055 */
1056 args->index = args->index2;
1057 args->blkno = args->blkno2;
1058 args->rmtblkno = args->rmtblkno2;
1059 args->rmtblkcnt = args->rmtblkcnt2;
1060 if (args->rmtblkno) {
1061 error = xfs_attr_rmtval_remove(args);
1062 if (error)
1063 return(error);
1064 }
1065
1066 /*
1067 * Read in the block containing the "old" attr, then
1068 * remove the "old" attr from that block (neat, huh!)
1069 */
1070 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1,
1071 &bp, XFS_ATTR_FORK);
1072 if (error)
1073 return(error);
1074 ASSERT(bp != NULL);
1075 (void)xfs_attr_leaf_remove(bp, args);
1076
1077 /*
1078 * If the result is small enough, shrink it all into the inode.
1079 */
1080 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1081 XFS_BMAP_INIT(args->flist, args->firstblock);
1082 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1083 /* bp is gone due to xfs_da_shrink_inode */
1084 if (!error) {
1085 error = xfs_bmap_finish(&args->trans,
1086 args->flist,
1087 &committed);
1088 }
1089 if (error) {
1090 ASSERT(committed);
1091 args->trans = NULL;
1092 xfs_bmap_cancel(args->flist);
1093 return(error);
1094 }
1095
1096 /*
1097 * bmap_finish() may have committed the last trans
1098 * and started a new one. We need the inode to be
1099 * in all transactions.
1100 */
1101 if (committed) {
1102 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1103 xfs_trans_ihold(args->trans, dp);
1104 }
1105 } else
1106 xfs_da_buf_done(bp);
1107
1108 /*
1109 * Commit the remove and start the next trans in series.
1110 */
1111 error = xfs_attr_rolltrans(&args->trans, dp);
1112
1113 } else if (args->rmtblkno > 0) {
1114 /*
1115 * Added a "remote" value, just clear the incomplete flag.
1116 */
1117 error = xfs_attr_leaf_clearflag(args);
1118 }
1119 return(error);
1120 }
1121
1122 /*
1123 * Remove a name from the leaf attribute list structure
1124 *
1125 * This leaf block cannot have a "remote" value, we only call this routine
1126 * if bmap_one_block() says there is only one block (ie: no remote blks).
1127 */
1128 STATIC int
1129 xfs_attr_leaf_removename(xfs_da_args_t *args)
1130 {
1131 xfs_inode_t *dp;
1132 xfs_dabuf_t *bp;
1133 int error, committed, forkoff;
1134
1135 /*
1136 * Remove the attribute.
1137 */
1138 dp = args->dp;
1139 args->blkno = 0;
1140 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
1141 XFS_ATTR_FORK);
1142 if (error) {
1143 return(error);
1144 }
1145
1146 ASSERT(bp != NULL);
1147 error = xfs_attr_leaf_lookup_int(bp, args);
1148 if (error == ENOATTR) {
1149 xfs_da_brelse(args->trans, bp);
1150 return(error);
1151 }
1152
1153 (void)xfs_attr_leaf_remove(bp, args);
1154
1155 /*
1156 * If the result is small enough, shrink it all into the inode.
1157 */
1158 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1159 XFS_BMAP_INIT(args->flist, args->firstblock);
1160 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1161 /* bp is gone due to xfs_da_shrink_inode */
1162 if (!error) {
1163 error = xfs_bmap_finish(&args->trans, args->flist,
1164 &committed);
1165 }
1166 if (error) {
1167 ASSERT(committed);
1168 args->trans = NULL;
1169 xfs_bmap_cancel(args->flist);
1170 return(error);
1171 }
1172
1173 /*
1174 * bmap_finish() may have committed the last trans and started
1175 * a new one. We need the inode to be in all transactions.
1176 */
1177 if (committed) {
1178 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1179 xfs_trans_ihold(args->trans, dp);
1180 }
1181 } else
1182 xfs_da_buf_done(bp);
1183 return(0);
1184 }
1185
1186 /*
1187 * Look up a name in a leaf attribute list structure.
1188 *
1189 * This leaf block cannot have a "remote" value, we only call this routine
1190 * if bmap_one_block() says there is only one block (ie: no remote blks).
1191 */
1192 STATIC int
1193 xfs_attr_leaf_get(xfs_da_args_t *args)
1194 {
1195 xfs_dabuf_t *bp;
1196 int error;
1197
1198 args->blkno = 0;
1199 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
1200 XFS_ATTR_FORK);
1201 if (error)
1202 return(error);
1203 ASSERT(bp != NULL);
1204
1205 error = xfs_attr_leaf_lookup_int(bp, args);
1206 if (error != EEXIST) {
1207 xfs_da_brelse(args->trans, bp);
1208 return(error);
1209 }
1210 error = xfs_attr_leaf_getvalue(bp, args);
1211 xfs_da_brelse(args->trans, bp);
1212 if (!error && (args->rmtblkno > 0) && !(args->flags & ATTR_KERNOVAL)) {
1213 error = xfs_attr_rmtval_get(args);
1214 }
1215 return(error);
1216 }
1217
1218 /*
1219 * Copy out attribute entries for attr_list(), for leaf attribute lists.
1220 */
1221 STATIC int
1222 xfs_attr_leaf_list(xfs_attr_list_context_t *context)
1223 {
1224 xfs_attr_leafblock_t *leaf;
1225 int error;
1226 xfs_dabuf_t *bp;
1227
1228 context->cursor->blkno = 0;
1229 error = xfs_da_read_buf(NULL, context->dp, 0, -1, &bp, XFS_ATTR_FORK);
1230 if (error)
1231 return XFS_ERROR(error);
1232 ASSERT(bp != NULL);
1233 leaf = bp->data;
1234 if (unlikely(be16_to_cpu(leaf->hdr.info.magic) != XFS_ATTR_LEAF_MAGIC)) {
1235 XFS_CORRUPTION_ERROR("xfs_attr_leaf_list", XFS_ERRLEVEL_LOW,
1236 context->dp->i_mount, leaf);
1237 xfs_da_brelse(NULL, bp);
1238 return XFS_ERROR(EFSCORRUPTED);
1239 }
1240
1241 error = xfs_attr_leaf_list_int(bp, context);
1242 xfs_da_brelse(NULL, bp);
1243 return XFS_ERROR(error);
1244 }
1245
1246
1247 /*========================================================================
1248 * External routines when attribute list size > XFS_LBSIZE(mp).
1249 *========================================================================*/
1250
1251 /*
1252 * Add a name to a Btree-format attribute list.
1253 *
1254 * This will involve walking down the Btree, and may involve splitting
1255 * leaf nodes and even splitting intermediate nodes up to and including
1256 * the root node (a special case of an intermediate node).
1257 *
1258 * "Remote" attribute values confuse the issue and atomic rename operations
1259 * add a whole extra layer of confusion on top of that.
1260 */
1261 STATIC int
1262 xfs_attr_node_addname(xfs_da_args_t *args)
1263 {
1264 xfs_da_state_t *state;
1265 xfs_da_state_blk_t *blk;
1266 xfs_inode_t *dp;
1267 xfs_mount_t *mp;
1268 int committed, retval, error;
1269
1270 /*
1271 * Fill in bucket of arguments/results/context to carry around.
1272 */
1273 dp = args->dp;
1274 mp = dp->i_mount;
1275 restart:
1276 state = xfs_da_state_alloc();
1277 state->args = args;
1278 state->mp = mp;
1279 state->blocksize = state->mp->m_sb.sb_blocksize;
1280 state->node_ents = state->mp->m_attr_node_ents;
1281
1282 /*
1283 * Search to see if name already exists, and get back a pointer
1284 * to where it should go.
1285 */
1286 error = xfs_da_node_lookup_int(state, &retval);
1287 if (error)
1288 goto out;
1289 blk = &state->path.blk[ state->path.active-1 ];
1290 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1291 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
1292 goto out;
1293 } else if (retval == EEXIST) {
1294 if (args->flags & ATTR_CREATE)
1295 goto out;
1296 args->rename = 1; /* atomic rename op */
1297 args->blkno2 = args->blkno; /* set 2nd entry info*/
1298 args->index2 = args->index;
1299 args->rmtblkno2 = args->rmtblkno;
1300 args->rmtblkcnt2 = args->rmtblkcnt;
1301 args->rmtblkno = 0;
1302 args->rmtblkcnt = 0;
1303 }
1304
1305 retval = xfs_attr_leaf_add(blk->bp, state->args);
1306 if (retval == ENOSPC) {
1307 if (state->path.active == 1) {
1308 /*
1309 * Its really a single leaf node, but it had
1310 * out-of-line values so it looked like it *might*
1311 * have been a b-tree.
1312 */
1313 xfs_da_state_free(state);
1314 XFS_BMAP_INIT(args->flist, args->firstblock);
1315 error = xfs_attr_leaf_to_node(args);
1316 if (!error) {
1317 error = xfs_bmap_finish(&args->trans,
1318 args->flist,
1319 &committed);
1320 }
1321 if (error) {
1322 ASSERT(committed);
1323 args->trans = NULL;
1324 xfs_bmap_cancel(args->flist);
1325 goto out;
1326 }
1327
1328 /*
1329 * bmap_finish() may have committed the last trans
1330 * and started a new one. We need the inode to be
1331 * in all transactions.
1332 */
1333 if (committed) {
1334 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1335 xfs_trans_ihold(args->trans, dp);
1336 }
1337
1338 /*
1339 * Commit the node conversion and start the next
1340 * trans in the chain.
1341 */
1342 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1343 goto out;
1344
1345 goto restart;
1346 }
1347
1348 /*
1349 * Split as many Btree elements as required.
1350 * This code tracks the new and old attr's location
1351 * in the index/blkno/rmtblkno/rmtblkcnt fields and
1352 * in the index2/blkno2/rmtblkno2/rmtblkcnt2 fields.
1353 */
1354 XFS_BMAP_INIT(args->flist, args->firstblock);
1355 error = xfs_da_split(state);
1356 if (!error) {
1357 error = xfs_bmap_finish(&args->trans, args->flist,
1358 &committed);
1359 }
1360 if (error) {
1361 ASSERT(committed);
1362 args->trans = NULL;
1363 xfs_bmap_cancel(args->flist);
1364 goto out;
1365 }
1366
1367 /*
1368 * bmap_finish() may have committed the last trans and started
1369 * a new one. We need the inode to be in all transactions.
1370 */
1371 if (committed) {
1372 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1373 xfs_trans_ihold(args->trans, dp);
1374 }
1375 } else {
1376 /*
1377 * Addition succeeded, update Btree hashvals.
1378 */
1379 xfs_da_fixhashpath(state, &state->path);
1380 }
1381
1382 /*
1383 * Kill the state structure, we're done with it and need to
1384 * allow the buffers to come back later.
1385 */
1386 xfs_da_state_free(state);
1387 state = NULL;
1388
1389 /*
1390 * Commit the leaf addition or btree split and start the next
1391 * trans in the chain.
1392 */
1393 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1394 goto out;
1395
1396 /*
1397 * If there was an out-of-line value, allocate the blocks we
1398 * identified for its storage and copy the value. This is done
1399 * after we create the attribute so that we don't overflow the
1400 * maximum size of a transaction and/or hit a deadlock.
1401 */
1402 if (args->rmtblkno > 0) {
1403 error = xfs_attr_rmtval_set(args);
1404 if (error)
1405 return(error);
1406 }
1407
1408 /*
1409 * If this is an atomic rename operation, we must "flip" the
1410 * incomplete flags on the "new" and "old" attribute/value pairs
1411 * so that one disappears and one appears atomically. Then we
1412 * must remove the "old" attribute/value pair.
1413 */
1414 if (args->rename) {
1415 /*
1416 * In a separate transaction, set the incomplete flag on the
1417 * "old" attr and clear the incomplete flag on the "new" attr.
1418 */
1419 error = xfs_attr_leaf_flipflags(args);
1420 if (error)
1421 goto out;
1422
1423 /*
1424 * Dismantle the "old" attribute/value pair by removing
1425 * a "remote" value (if it exists).
1426 */
1427 args->index = args->index2;
1428 args->blkno = args->blkno2;
1429 args->rmtblkno = args->rmtblkno2;
1430 args->rmtblkcnt = args->rmtblkcnt2;
1431 if (args->rmtblkno) {
1432 error = xfs_attr_rmtval_remove(args);
1433 if (error)
1434 return(error);
1435 }
1436
1437 /*
1438 * Re-find the "old" attribute entry after any split ops.
1439 * The INCOMPLETE flag means that we will find the "old"
1440 * attr, not the "new" one.
1441 */
1442 args->flags |= XFS_ATTR_INCOMPLETE;
1443 state = xfs_da_state_alloc();
1444 state->args = args;
1445 state->mp = mp;
1446 state->blocksize = state->mp->m_sb.sb_blocksize;
1447 state->node_ents = state->mp->m_attr_node_ents;
1448 state->inleaf = 0;
1449 error = xfs_da_node_lookup_int(state, &retval);
1450 if (error)
1451 goto out;
1452
1453 /*
1454 * Remove the name and update the hashvals in the tree.
1455 */
1456 blk = &state->path.blk[ state->path.active-1 ];
1457 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1458 error = xfs_attr_leaf_remove(blk->bp, args);
1459 xfs_da_fixhashpath(state, &state->path);
1460
1461 /*
1462 * Check to see if the tree needs to be collapsed.
1463 */
1464 if (retval && (state->path.active > 1)) {
1465 XFS_BMAP_INIT(args->flist, args->firstblock);
1466 error = xfs_da_join(state);
1467 if (!error) {
1468 error = xfs_bmap_finish(&args->trans,
1469 args->flist,
1470 &committed);
1471 }
1472 if (error) {
1473 ASSERT(committed);
1474 args->trans = NULL;
1475 xfs_bmap_cancel(args->flist);
1476 goto out;
1477 }
1478
1479 /*
1480 * bmap_finish() may have committed the last trans
1481 * and started a new one. We need the inode to be
1482 * in all transactions.
1483 */
1484 if (committed) {
1485 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1486 xfs_trans_ihold(args->trans, dp);
1487 }
1488 }
1489
1490 /*
1491 * Commit and start the next trans in the chain.
1492 */
1493 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1494 goto out;
1495
1496 } else if (args->rmtblkno > 0) {
1497 /*
1498 * Added a "remote" value, just clear the incomplete flag.
1499 */
1500 error = xfs_attr_leaf_clearflag(args);
1501 if (error)
1502 goto out;
1503 }
1504 retval = error = 0;
1505
1506 out:
1507 if (state)
1508 xfs_da_state_free(state);
1509 if (error)
1510 return(error);
1511 return(retval);
1512 }
1513
1514 /*
1515 * Remove a name from a B-tree attribute list.
1516 *
1517 * This will involve walking down the Btree, and may involve joining
1518 * leaf nodes and even joining intermediate nodes up to and including
1519 * the root node (a special case of an intermediate node).
1520 */
1521 STATIC int
1522 xfs_attr_node_removename(xfs_da_args_t *args)
1523 {
1524 xfs_da_state_t *state;
1525 xfs_da_state_blk_t *blk;
1526 xfs_inode_t *dp;
1527 xfs_dabuf_t *bp;
1528 int retval, error, committed, forkoff;
1529
1530 /*
1531 * Tie a string around our finger to remind us where we are.
1532 */
1533 dp = args->dp;
1534 state = xfs_da_state_alloc();
1535 state->args = args;
1536 state->mp = dp->i_mount;
1537 state->blocksize = state->mp->m_sb.sb_blocksize;
1538 state->node_ents = state->mp->m_attr_node_ents;
1539
1540 /*
1541 * Search to see if name exists, and get back a pointer to it.
1542 */
1543 error = xfs_da_node_lookup_int(state, &retval);
1544 if (error || (retval != EEXIST)) {
1545 if (error == 0)
1546 error = retval;
1547 goto out;
1548 }
1549
1550 /*
1551 * If there is an out-of-line value, de-allocate the blocks.
1552 * This is done before we remove the attribute so that we don't
1553 * overflow the maximum size of a transaction and/or hit a deadlock.
1554 */
1555 blk = &state->path.blk[ state->path.active-1 ];
1556 ASSERT(blk->bp != NULL);
1557 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1558 if (args->rmtblkno > 0) {
1559 /*
1560 * Fill in disk block numbers in the state structure
1561 * so that we can get the buffers back after we commit
1562 * several transactions in the following calls.
1563 */
1564 error = xfs_attr_fillstate(state);
1565 if (error)
1566 goto out;
1567
1568 /*
1569 * Mark the attribute as INCOMPLETE, then bunmapi() the
1570 * remote value.
1571 */
1572 error = xfs_attr_leaf_setflag(args);
1573 if (error)
1574 goto out;
1575 error = xfs_attr_rmtval_remove(args);
1576 if (error)
1577 goto out;
1578
1579 /*
1580 * Refill the state structure with buffers, the prior calls
1581 * released our buffers.
1582 */
1583 error = xfs_attr_refillstate(state);
1584 if (error)
1585 goto out;
1586 }
1587
1588 /*
1589 * Remove the name and update the hashvals in the tree.
1590 */
1591 blk = &state->path.blk[ state->path.active-1 ];
1592 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1593 retval = xfs_attr_leaf_remove(blk->bp, args);
1594 xfs_da_fixhashpath(state, &state->path);
1595
1596 /*
1597 * Check to see if the tree needs to be collapsed.
1598 */
1599 if (retval && (state->path.active > 1)) {
1600 XFS_BMAP_INIT(args->flist, args->firstblock);
1601 error = xfs_da_join(state);
1602 if (!error) {
1603 error = xfs_bmap_finish(&args->trans, args->flist,
1604 &committed);
1605 }
1606 if (error) {
1607 ASSERT(committed);
1608 args->trans = NULL;
1609 xfs_bmap_cancel(args->flist);
1610 goto out;
1611 }
1612
1613 /*
1614 * bmap_finish() may have committed the last trans and started
1615 * a new one. We need the inode to be in all transactions.
1616 */
1617 if (committed) {
1618 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1619 xfs_trans_ihold(args->trans, dp);
1620 }
1621
1622 /*
1623 * Commit the Btree join operation and start a new trans.
1624 */
1625 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1626 goto out;
1627 }
1628
1629 /*
1630 * If the result is small enough, push it all into the inode.
1631 */
1632 if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
1633 /*
1634 * Have to get rid of the copy of this dabuf in the state.
1635 */
1636 ASSERT(state->path.active == 1);
1637 ASSERT(state->path.blk[0].bp);
1638 xfs_da_buf_done(state->path.blk[0].bp);
1639 state->path.blk[0].bp = NULL;
1640
1641 error = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp,
1642 XFS_ATTR_FORK);
1643 if (error)
1644 goto out;
1645 ASSERT(be16_to_cpu(((xfs_attr_leafblock_t *)
1646 bp->data)->hdr.info.magic)
1647 == XFS_ATTR_LEAF_MAGIC);
1648
1649 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1650 XFS_BMAP_INIT(args->flist, args->firstblock);
1651 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1652 /* bp is gone due to xfs_da_shrink_inode */
1653 if (!error) {
1654 error = xfs_bmap_finish(&args->trans,
1655 args->flist,
1656 &committed);
1657 }
1658 if (error) {
1659 ASSERT(committed);
1660 args->trans = NULL;
1661 xfs_bmap_cancel(args->flist);
1662 goto out;
1663 }
1664
1665 /*
1666 * bmap_finish() may have committed the last trans
1667 * and started a new one. We need the inode to be
1668 * in all transactions.
1669 */
1670 if (committed) {
1671 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1672 xfs_trans_ihold(args->trans, dp);
1673 }
1674 } else
1675 xfs_da_brelse(args->trans, bp);
1676 }
1677 error = 0;
1678
1679 out:
1680 xfs_da_state_free(state);
1681 return(error);
1682 }
1683
1684 /*
1685 * Fill in the disk block numbers in the state structure for the buffers
1686 * that are attached to the state structure.
1687 * This is done so that we can quickly reattach ourselves to those buffers
1688 * after some set of transaction commits have released these buffers.
1689 */
1690 STATIC int
1691 xfs_attr_fillstate(xfs_da_state_t *state)
1692 {
1693 xfs_da_state_path_t *path;
1694 xfs_da_state_blk_t *blk;
1695 int level;
1696
1697 /*
1698 * Roll down the "path" in the state structure, storing the on-disk
1699 * block number for those buffers in the "path".
1700 */
1701 path = &state->path;
1702 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1703 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1704 if (blk->bp) {
1705 blk->disk_blkno = xfs_da_blkno(blk->bp);
1706 xfs_da_buf_done(blk->bp);
1707 blk->bp = NULL;
1708 } else {
1709 blk->disk_blkno = 0;
1710 }
1711 }
1712
1713 /*
1714 * Roll down the "altpath" in the state structure, storing the on-disk
1715 * block number for those buffers in the "altpath".
1716 */
1717 path = &state->altpath;
1718 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1719 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1720 if (blk->bp) {
1721 blk->disk_blkno = xfs_da_blkno(blk->bp);
1722 xfs_da_buf_done(blk->bp);
1723 blk->bp = NULL;
1724 } else {
1725 blk->disk_blkno = 0;
1726 }
1727 }
1728
1729 return(0);
1730 }
1731
1732 /*
1733 * Reattach the buffers to the state structure based on the disk block
1734 * numbers stored in the state structure.
1735 * This is done after some set of transaction commits have released those
1736 * buffers from our grip.
1737 */
1738 STATIC int
1739 xfs_attr_refillstate(xfs_da_state_t *state)
1740 {
1741 xfs_da_state_path_t *path;
1742 xfs_da_state_blk_t *blk;
1743 int level, error;
1744
1745 /*
1746 * Roll down the "path" in the state structure, storing the on-disk
1747 * block number for those buffers in the "path".
1748 */
1749 path = &state->path;
1750 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1751 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1752 if (blk->disk_blkno) {
1753 error = xfs_da_read_buf(state->args->trans,
1754 state->args->dp,
1755 blk->blkno, blk->disk_blkno,
1756 &blk->bp, XFS_ATTR_FORK);
1757 if (error)
1758 return(error);
1759 } else {
1760 blk->bp = NULL;
1761 }
1762 }
1763
1764 /*
1765 * Roll down the "altpath" in the state structure, storing the on-disk
1766 * block number for those buffers in the "altpath".
1767 */
1768 path = &state->altpath;
1769 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1770 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1771 if (blk->disk_blkno) {
1772 error = xfs_da_read_buf(state->args->trans,
1773 state->args->dp,
1774 blk->blkno, blk->disk_blkno,
1775 &blk->bp, XFS_ATTR_FORK);
1776 if (error)
1777 return(error);
1778 } else {
1779 blk->bp = NULL;
1780 }
1781 }
1782
1783 return(0);
1784 }
1785
1786 /*
1787 * Look up a filename in a node attribute list.
1788 *
1789 * This routine gets called for any attribute fork that has more than one
1790 * block, ie: both true Btree attr lists and for single-leaf-blocks with
1791 * "remote" values taking up more blocks.
1792 */
1793 STATIC int
1794 xfs_attr_node_get(xfs_da_args_t *args)
1795 {
1796 xfs_da_state_t *state;
1797 xfs_da_state_blk_t *blk;
1798 int error, retval;
1799 int i;
1800
1801 state = xfs_da_state_alloc();
1802 state->args = args;
1803 state->mp = args->dp->i_mount;
1804 state->blocksize = state->mp->m_sb.sb_blocksize;
1805 state->node_ents = state->mp->m_attr_node_ents;
1806
1807 /*
1808 * Search to see if name exists, and get back a pointer to it.
1809 */
1810 error = xfs_da_node_lookup_int(state, &retval);
1811 if (error) {
1812 retval = error;
1813 } else if (retval == EEXIST) {
1814 blk = &state->path.blk[ state->path.active-1 ];
1815 ASSERT(blk->bp != NULL);
1816 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1817
1818 /*
1819 * Get the value, local or "remote"
1820 */
1821 retval = xfs_attr_leaf_getvalue(blk->bp, args);
1822 if (!retval && (args->rmtblkno > 0)
1823 && !(args->flags & ATTR_KERNOVAL)) {
1824 retval = xfs_attr_rmtval_get(args);
1825 }
1826 }
1827
1828 /*
1829 * If not in a transaction, we have to release all the buffers.
1830 */
1831 for (i = 0; i < state->path.active; i++) {
1832 xfs_da_brelse(args->trans, state->path.blk[i].bp);
1833 state->path.blk[i].bp = NULL;
1834 }
1835
1836 xfs_da_state_free(state);
1837 return(retval);
1838 }
1839
1840 STATIC int /* error */
1841 xfs_attr_node_list(xfs_attr_list_context_t *context)
1842 {
1843 attrlist_cursor_kern_t *cursor;
1844 xfs_attr_leafblock_t *leaf;
1845 xfs_da_intnode_t *node;
1846 xfs_da_node_entry_t *btree;
1847 int error, i;
1848 xfs_dabuf_t *bp;
1849
1850 cursor = context->cursor;
1851 cursor->initted = 1;
1852
1853 /*
1854 * Do all sorts of validation on the passed-in cursor structure.
1855 * If anything is amiss, ignore the cursor and look up the hashval
1856 * starting from the btree root.
1857 */
1858 bp = NULL;
1859 if (cursor->blkno > 0) {
1860 error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
1861 &bp, XFS_ATTR_FORK);
1862 if ((error != 0) && (error != EFSCORRUPTED))
1863 return(error);
1864 if (bp) {
1865 node = bp->data;
1866 switch (be16_to_cpu(node->hdr.info.magic)) {
1867 case XFS_DA_NODE_MAGIC:
1868 xfs_attr_trace_l_cn("wrong blk", context, node);
1869 xfs_da_brelse(NULL, bp);
1870 bp = NULL;
1871 break;
1872 case XFS_ATTR_LEAF_MAGIC:
1873 leaf = bp->data;
1874 if (cursor->hashval > be32_to_cpu(leaf->entries[
1875 be16_to_cpu(leaf->hdr.count)-1].hashval)) {
1876 xfs_attr_trace_l_cl("wrong blk",
1877 context, leaf);
1878 xfs_da_brelse(NULL, bp);
1879 bp = NULL;
1880 } else if (cursor->hashval <=
1881 be32_to_cpu(leaf->entries[0].hashval)) {
1882 xfs_attr_trace_l_cl("maybe wrong blk",
1883 context, leaf);
1884 xfs_da_brelse(NULL, bp);
1885 bp = NULL;
1886 }
1887 break;
1888 default:
1889 xfs_attr_trace_l_c("wrong blk - ??", context);
1890 xfs_da_brelse(NULL, bp);
1891 bp = NULL;
1892 }
1893 }
1894 }
1895
1896 /*
1897 * We did not find what we expected given the cursor's contents,
1898 * so we start from the top and work down based on the hash value.
1899 * Note that start of node block is same as start of leaf block.
1900 */
1901 if (bp == NULL) {
1902 cursor->blkno = 0;
1903 for (;;) {
1904 error = xfs_da_read_buf(NULL, context->dp,
1905 cursor->blkno, -1, &bp,
1906 XFS_ATTR_FORK);
1907 if (error)
1908 return(error);
1909 if (unlikely(bp == NULL)) {
1910 XFS_ERROR_REPORT("xfs_attr_node_list(2)",
1911 XFS_ERRLEVEL_LOW,
1912 context->dp->i_mount);
1913 return(XFS_ERROR(EFSCORRUPTED));
1914 }
1915 node = bp->data;
1916 if (be16_to_cpu(node->hdr.info.magic)
1917 == XFS_ATTR_LEAF_MAGIC)
1918 break;
1919 if (unlikely(be16_to_cpu(node->hdr.info.magic)
1920 != XFS_DA_NODE_MAGIC)) {
1921 XFS_CORRUPTION_ERROR("xfs_attr_node_list(3)",
1922 XFS_ERRLEVEL_LOW,
1923 context->dp->i_mount,
1924 node);
1925 xfs_da_brelse(NULL, bp);
1926 return(XFS_ERROR(EFSCORRUPTED));
1927 }
1928 btree = node->btree;
1929 for (i = 0; i < be16_to_cpu(node->hdr.count);
1930 btree++, i++) {
1931 if (cursor->hashval
1932 <= be32_to_cpu(btree->hashval)) {
1933 cursor->blkno = be32_to_cpu(btree->before);
1934 xfs_attr_trace_l_cb("descending",
1935 context, btree);
1936 break;
1937 }
1938 }
1939 if (i == be16_to_cpu(node->hdr.count)) {
1940 xfs_da_brelse(NULL, bp);
1941 return(0);
1942 }
1943 xfs_da_brelse(NULL, bp);
1944 }
1945 }
1946 ASSERT(bp != NULL);
1947
1948 /*
1949 * Roll upward through the blocks, processing each leaf block in
1950 * order. As long as there is space in the result buffer, keep
1951 * adding the information.
1952 */
1953 for (;;) {
1954 leaf = bp->data;
1955 if (unlikely(be16_to_cpu(leaf->hdr.info.magic)
1956 != XFS_ATTR_LEAF_MAGIC)) {
1957 XFS_CORRUPTION_ERROR("xfs_attr_node_list(4)",
1958 XFS_ERRLEVEL_LOW,
1959 context->dp->i_mount, leaf);
1960 xfs_da_brelse(NULL, bp);
1961 return(XFS_ERROR(EFSCORRUPTED));
1962 }
1963 error = xfs_attr_leaf_list_int(bp, context);
1964 if (error) {
1965 xfs_da_brelse(NULL, bp);
1966 return error;
1967 }
1968 if (context->seen_enough || leaf->hdr.info.forw == 0)
1969 break;
1970 cursor->blkno = be32_to_cpu(leaf->hdr.info.forw);
1971 xfs_da_brelse(NULL, bp);
1972 error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
1973 &bp, XFS_ATTR_FORK);
1974 if (error)
1975 return(error);
1976 if (unlikely((bp == NULL))) {
1977 XFS_ERROR_REPORT("xfs_attr_node_list(5)",
1978 XFS_ERRLEVEL_LOW,
1979 context->dp->i_mount);
1980 return(XFS_ERROR(EFSCORRUPTED));
1981 }
1982 }
1983 xfs_da_brelse(NULL, bp);
1984 return(0);
1985 }
1986
1987
1988 /*========================================================================
1989 * External routines for manipulating out-of-line attribute values.
1990 *========================================================================*/
1991
1992 /*
1993 * Read the value associated with an attribute from the out-of-line buffer
1994 * that we stored it in.
1995 */
1996 int
1997 xfs_attr_rmtval_get(xfs_da_args_t *args)
1998 {
1999 xfs_bmbt_irec_t map[ATTR_RMTVALUE_MAPSIZE];
2000 xfs_mount_t *mp;
2001 xfs_daddr_t dblkno;
2002 xfs_caddr_t dst;
2003 xfs_buf_t *bp;
2004 int nmap, error, tmp, valuelen, blkcnt, i;
2005 xfs_dablk_t lblkno;
2006
2007 ASSERT(!(args->flags & ATTR_KERNOVAL));
2008
2009 mp = args->dp->i_mount;
2010 dst = args->value;
2011 valuelen = args->valuelen;
2012 lblkno = args->rmtblkno;
2013 while (valuelen > 0) {
2014 nmap = ATTR_RMTVALUE_MAPSIZE;
2015 error = xfs_bmapi(args->trans, args->dp, (xfs_fileoff_t)lblkno,
2016 args->rmtblkcnt,
2017 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2018 NULL, 0, map, &nmap, NULL, NULL);
2019 if (error)
2020 return(error);
2021 ASSERT(nmap >= 1);
2022
2023 for (i = 0; (i < nmap) && (valuelen > 0); i++) {
2024 ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) &&
2025 (map[i].br_startblock != HOLESTARTBLOCK));
2026 dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock);
2027 blkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
2028 error = xfs_read_buf(mp, mp->m_ddev_targp, dblkno,
2029 blkcnt, XFS_BUF_LOCK, &bp);
2030 if (error)
2031 return(error);
2032
2033 tmp = (valuelen < XFS_BUF_SIZE(bp))
2034 ? valuelen : XFS_BUF_SIZE(bp);
2035 xfs_biomove(bp, 0, tmp, dst, XFS_B_READ);
2036 xfs_buf_relse(bp);
2037 dst += tmp;
2038 valuelen -= tmp;
2039
2040 lblkno += map[i].br_blockcount;
2041 }
2042 }
2043 ASSERT(valuelen == 0);
2044 return(0);
2045 }
2046
2047 /*
2048 * Write the value associated with an attribute into the out-of-line buffer
2049 * that we have defined for it.
2050 */
2051 STATIC int
2052 xfs_attr_rmtval_set(xfs_da_args_t *args)
2053 {
2054 xfs_mount_t *mp;
2055 xfs_fileoff_t lfileoff;
2056 xfs_inode_t *dp;
2057 xfs_bmbt_irec_t map;
2058 xfs_daddr_t dblkno;
2059 xfs_caddr_t src;
2060 xfs_buf_t *bp;
2061 xfs_dablk_t lblkno;
2062 int blkcnt, valuelen, nmap, error, tmp, committed;
2063
2064 dp = args->dp;
2065 mp = dp->i_mount;
2066 src = args->value;
2067
2068 /*
2069 * Find a "hole" in the attribute address space large enough for
2070 * us to drop the new attribute's value into.
2071 */
2072 blkcnt = XFS_B_TO_FSB(mp, args->valuelen);
2073 lfileoff = 0;
2074 error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff,
2075 XFS_ATTR_FORK);
2076 if (error) {
2077 return(error);
2078 }
2079 args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff;
2080 args->rmtblkcnt = blkcnt;
2081
2082 /*
2083 * Roll through the "value", allocating blocks on disk as required.
2084 */
2085 while (blkcnt > 0) {
2086 /*
2087 * Allocate a single extent, up to the size of the value.
2088 */
2089 XFS_BMAP_INIT(args->flist, args->firstblock);
2090 nmap = 1;
2091 error = xfs_bmapi(args->trans, dp, (xfs_fileoff_t)lblkno,
2092 blkcnt,
2093 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA |
2094 XFS_BMAPI_WRITE,
2095 args->firstblock, args->total, &map, &nmap,
2096 args->flist, NULL);
2097 if (!error) {
2098 error = xfs_bmap_finish(&args->trans, args->flist,
2099 &committed);
2100 }
2101 if (error) {
2102 ASSERT(committed);
2103 args->trans = NULL;
2104 xfs_bmap_cancel(args->flist);
2105 return(error);
2106 }
2107
2108 /*
2109 * bmap_finish() may have committed the last trans and started
2110 * a new one. We need the inode to be in all transactions.
2111 */
2112 if (committed) {
2113 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
2114 xfs_trans_ihold(args->trans, dp);
2115 }
2116
2117 ASSERT(nmap == 1);
2118 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2119 (map.br_startblock != HOLESTARTBLOCK));
2120 lblkno += map.br_blockcount;
2121 blkcnt -= map.br_blockcount;
2122
2123 /*
2124 * Start the next trans in the chain.
2125 */
2126 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
2127 return (error);
2128 }
2129
2130 /*
2131 * Roll through the "value", copying the attribute value to the
2132 * already-allocated blocks. Blocks are written synchronously
2133 * so that we can know they are all on disk before we turn off
2134 * the INCOMPLETE flag.
2135 */
2136 lblkno = args->rmtblkno;
2137 valuelen = args->valuelen;
2138 while (valuelen > 0) {
2139 /*
2140 * Try to remember where we decided to put the value.
2141 */
2142 XFS_BMAP_INIT(args->flist, args->firstblock);
2143 nmap = 1;
2144 error = xfs_bmapi(NULL, dp, (xfs_fileoff_t)lblkno,
2145 args->rmtblkcnt,
2146 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2147 args->firstblock, 0, &map, &nmap,
2148 NULL, NULL);
2149 if (error) {
2150 return(error);
2151 }
2152 ASSERT(nmap == 1);
2153 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2154 (map.br_startblock != HOLESTARTBLOCK));
2155
2156 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
2157 blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
2158
2159 bp = xfs_buf_get_flags(mp->m_ddev_targp, dblkno,
2160 blkcnt, XFS_BUF_LOCK);
2161 ASSERT(bp);
2162 ASSERT(!XFS_BUF_GETERROR(bp));
2163
2164 tmp = (valuelen < XFS_BUF_SIZE(bp)) ? valuelen :
2165 XFS_BUF_SIZE(bp);
2166 xfs_biomove(bp, 0, tmp, src, XFS_B_WRITE);
2167 if (tmp < XFS_BUF_SIZE(bp))
2168 xfs_biozero(bp, tmp, XFS_BUF_SIZE(bp) - tmp);
2169 if ((error = xfs_bwrite(mp, bp))) {/* GROT: NOTE: synchronous write */
2170 return (error);
2171 }
2172 src += tmp;
2173 valuelen -= tmp;
2174
2175 lblkno += map.br_blockcount;
2176 }
2177 ASSERT(valuelen == 0);
2178 return(0);
2179 }
2180
2181 /*
2182 * Remove the value associated with an attribute by deleting the
2183 * out-of-line buffer that it is stored on.
2184 */
2185 STATIC int
2186 xfs_attr_rmtval_remove(xfs_da_args_t *args)
2187 {
2188 xfs_mount_t *mp;
2189 xfs_bmbt_irec_t map;
2190 xfs_buf_t *bp;
2191 xfs_daddr_t dblkno;
2192 xfs_dablk_t lblkno;
2193 int valuelen, blkcnt, nmap, error, done, committed;
2194
2195 mp = args->dp->i_mount;
2196
2197 /*
2198 * Roll through the "value", invalidating the attribute value's
2199 * blocks.
2200 */
2201 lblkno = args->rmtblkno;
2202 valuelen = args->rmtblkcnt;
2203 while (valuelen > 0) {
2204 /*
2205 * Try to remember where we decided to put the value.
2206 */
2207 XFS_BMAP_INIT(args->flist, args->firstblock);
2208 nmap = 1;
2209 error = xfs_bmapi(NULL, args->dp, (xfs_fileoff_t)lblkno,
2210 args->rmtblkcnt,
2211 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2212 args->firstblock, 0, &map, &nmap,
2213 args->flist, NULL);
2214 if (error) {
2215 return(error);
2216 }
2217 ASSERT(nmap == 1);
2218 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2219 (map.br_startblock != HOLESTARTBLOCK));
2220
2221 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
2222 blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
2223
2224 /*
2225 * If the "remote" value is in the cache, remove it.
2226 */
2227 bp = xfs_incore(mp->m_ddev_targp, dblkno, blkcnt,
2228 XFS_INCORE_TRYLOCK);
2229 if (bp) {
2230 XFS_BUF_STALE(bp);
2231 XFS_BUF_UNDELAYWRITE(bp);
2232 xfs_buf_relse(bp);
2233 bp = NULL;
2234 }
2235
2236 valuelen -= map.br_blockcount;
2237
2238 lblkno += map.br_blockcount;
2239 }
2240
2241 /*
2242 * Keep de-allocating extents until the remote-value region is gone.
2243 */
2244 lblkno = args->rmtblkno;
2245 blkcnt = args->rmtblkcnt;
2246 done = 0;
2247 while (!done) {
2248 XFS_BMAP_INIT(args->flist, args->firstblock);
2249 error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt,
2250 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2251 1, args->firstblock, args->flist,
2252 NULL, &done);
2253 if (!error) {
2254 error = xfs_bmap_finish(&args->trans, args->flist,
2255 &committed);
2256 }
2257 if (error) {
2258 ASSERT(committed);
2259 args->trans = NULL;
2260 xfs_bmap_cancel(args->flist);
2261 return(error);
2262 }
2263
2264 /*
2265 * bmap_finish() may have committed the last trans and started
2266 * a new one. We need the inode to be in all transactions.
2267 */
2268 if (committed) {
2269 xfs_trans_ijoin(args->trans, args->dp, XFS_ILOCK_EXCL);
2270 xfs_trans_ihold(args->trans, args->dp);
2271 }
2272
2273 /*
2274 * Close out trans and start the next one in the chain.
2275 */
2276 if ((error = xfs_attr_rolltrans(&args->trans, args->dp)))
2277 return (error);
2278 }
2279 return(0);
2280 }
2281
2282 #if defined(XFS_ATTR_TRACE)
2283 /*
2284 * Add a trace buffer entry for an attr_list context structure.
2285 */
2286 void
2287 xfs_attr_trace_l_c(char *where, struct xfs_attr_list_context *context)
2288 {
2289 xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_C, where,
2290 (__psunsigned_t)context->dp,
2291 (__psunsigned_t)context->cursor->hashval,
2292 (__psunsigned_t)context->cursor->blkno,
2293 (__psunsigned_t)context->cursor->offset,
2294 (__psunsigned_t)context->alist,
2295 (__psunsigned_t)context->bufsize,
2296 (__psunsigned_t)context->count,
2297 (__psunsigned_t)context->firstu,
2298 (__psunsigned_t)
2299 ((context->count > 0) &&
2300 !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2301 ? (ATTR_ENTRY(context->alist,
2302 context->count-1)->a_valuelen)
2303 : 0,
2304 (__psunsigned_t)context->dupcnt,
2305 (__psunsigned_t)context->flags,
2306 (__psunsigned_t)NULL,
2307 (__psunsigned_t)NULL,
2308 (__psunsigned_t)NULL);
2309 }
2310
2311 /*
2312 * Add a trace buffer entry for a context structure and a Btree node.
2313 */
2314 void
2315 xfs_attr_trace_l_cn(char *where, struct xfs_attr_list_context *context,
2316 struct xfs_da_intnode *node)
2317 {
2318 xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CN, where,
2319 (__psunsigned_t)context->dp,
2320 (__psunsigned_t)context->cursor->hashval,
2321 (__psunsigned_t)context->cursor->blkno,
2322 (__psunsigned_t)context->cursor->offset,
2323 (__psunsigned_t)context->alist,
2324 (__psunsigned_t)context->bufsize,
2325 (__psunsigned_t)context->count,
2326 (__psunsigned_t)context->firstu,
2327 (__psunsigned_t)
2328 ((context->count > 0) &&
2329 !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2330 ? (ATTR_ENTRY(context->alist,
2331 context->count-1)->a_valuelen)
2332 : 0,
2333 (__psunsigned_t)context->dupcnt,
2334 (__psunsigned_t)context->flags,
2335 (__psunsigned_t)be16_to_cpu(node->hdr.count),
2336 (__psunsigned_t)be32_to_cpu(node->btree[0].hashval),
2337 (__psunsigned_t)be32_to_cpu(node->btree[
2338 be16_to_cpu(node->hdr.count)-1].hashval));
2339 }
2340
2341 /*
2342 * Add a trace buffer entry for a context structure and a Btree element.
2343 */
2344 void
2345 xfs_attr_trace_l_cb(char *where, struct xfs_attr_list_context *context,
2346 struct xfs_da_node_entry *btree)
2347 {
2348 xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CB, where,
2349 (__psunsigned_t)context->dp,
2350 (__psunsigned_t)context->cursor->hashval,
2351 (__psunsigned_t)context->cursor->blkno,
2352 (__psunsigned_t)context->cursor->offset,
2353 (__psunsigned_t)context->alist,
2354 (__psunsigned_t)context->bufsize,
2355 (__psunsigned_t)context->count,
2356 (__psunsigned_t)context->firstu,
2357 (__psunsigned_t)
2358 ((context->count > 0) &&
2359 !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2360 ? (ATTR_ENTRY(context->alist,
2361 context->count-1)->a_valuelen)
2362 : 0,
2363 (__psunsigned_t)context->dupcnt,
2364 (__psunsigned_t)context->flags,
2365 (__psunsigned_t)be32_to_cpu(btree->hashval),
2366 (__psunsigned_t)be32_to_cpu(btree->before),
2367 (__psunsigned_t)NULL);
2368 }
2369
2370 /*
2371 * Add a trace buffer entry for a context structure and a leaf block.
2372 */
2373 void
2374 xfs_attr_trace_l_cl(char *where, struct xfs_attr_list_context *context,
2375 struct xfs_attr_leafblock *leaf)
2376 {
2377 xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CL, where,
2378 (__psunsigned_t)context->dp,
2379 (__psunsigned_t)context->cursor->hashval,
2380 (__psunsigned_t)context->cursor->blkno,
2381 (__psunsigned_t)context->cursor->offset,
2382 (__psunsigned_t)context->alist,
2383 (__psunsigned_t)context->bufsize,
2384 (__psunsigned_t)context->count,
2385 (__psunsigned_t)context->firstu,
2386 (__psunsigned_t)
2387 ((context->count > 0) &&
2388 !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2389 ? (ATTR_ENTRY(context->alist,
2390 context->count-1)->a_valuelen)
2391 : 0,
2392 (__psunsigned_t)context->dupcnt,
2393 (__psunsigned_t)context->flags,
2394 (__psunsigned_t)be16_to_cpu(leaf->hdr.count),
2395 (__psunsigned_t)be32_to_cpu(leaf->entries[0].hashval),
2396 (__psunsigned_t)be32_to_cpu(leaf->entries[
2397 be16_to_cpu(leaf->hdr.count)-1].hashval));
2398 }
2399
2400 /*
2401 * Add a trace buffer entry for the arguments given to the routine,
2402 * generic form.
2403 */
2404 void
2405 xfs_attr_trace_enter(int type, char *where,
2406 __psunsigned_t a2, __psunsigned_t a3,
2407 __psunsigned_t a4, __psunsigned_t a5,
2408 __psunsigned_t a6, __psunsigned_t a7,
2409 __psunsigned_t a8, __psunsigned_t a9,
2410 __psunsigned_t a10, __psunsigned_t a11,
2411 __psunsigned_t a12, __psunsigned_t a13,
2412 __psunsigned_t a14, __psunsigned_t a15)
2413 {
2414 ASSERT(xfs_attr_trace_buf);
2415 ktrace_enter(xfs_attr_trace_buf, (void *)((__psunsigned_t)type),
2416 (void *)where,
2417 (void *)a2, (void *)a3, (void *)a4,
2418 (void *)a5, (void *)a6, (void *)a7,
2419 (void *)a8, (void *)a9, (void *)a10,
2420 (void *)a11, (void *)a12, (void *)a13,
2421 (void *)a14, (void *)a15);
2422 }
2423 #endif /* XFS_ATTR_TRACE */
2424
2425
2426 /*========================================================================
2427 * System (pseudo) namespace attribute interface routines.
2428 *========================================================================*/
2429
2430 STATIC int
2431 posix_acl_access_set(
2432 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2433 {
2434 return xfs_acl_vset(vp, data, size, _ACL_TYPE_ACCESS);
2435 }
2436
2437 STATIC int
2438 posix_acl_access_remove(
2439 bhv_vnode_t *vp, char *name, int xflags)
2440 {
2441 return xfs_acl_vremove(vp, _ACL_TYPE_ACCESS);
2442 }
2443
2444 STATIC int
2445 posix_acl_access_get(
2446 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2447 {
2448 return xfs_acl_vget(vp, data, size, _ACL_TYPE_ACCESS);
2449 }
2450
2451 STATIC int
2452 posix_acl_access_exists(
2453 bhv_vnode_t *vp)
2454 {
2455 return xfs_acl_vhasacl_access(vp);
2456 }
2457
2458 STATIC int
2459 posix_acl_default_set(
2460 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2461 {
2462 return xfs_acl_vset(vp, data, size, _ACL_TYPE_DEFAULT);
2463 }
2464
2465 STATIC int
2466 posix_acl_default_get(
2467 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2468 {
2469 return xfs_acl_vget(vp, data, size, _ACL_TYPE_DEFAULT);
2470 }
2471
2472 STATIC int
2473 posix_acl_default_remove(
2474 bhv_vnode_t *vp, char *name, int xflags)
2475 {
2476 return xfs_acl_vremove(vp, _ACL_TYPE_DEFAULT);
2477 }
2478
2479 STATIC int
2480 posix_acl_default_exists(
2481 bhv_vnode_t *vp)
2482 {
2483 return xfs_acl_vhasacl_default(vp);
2484 }
2485
2486 static struct attrnames posix_acl_access = {
2487 .attr_name = "posix_acl_access",
2488 .attr_namelen = sizeof("posix_acl_access") - 1,
2489 .attr_get = posix_acl_access_get,
2490 .attr_set = posix_acl_access_set,
2491 .attr_remove = posix_acl_access_remove,
2492 .attr_exists = posix_acl_access_exists,
2493 };
2494
2495 static struct attrnames posix_acl_default = {
2496 .attr_name = "posix_acl_default",
2497 .attr_namelen = sizeof("posix_acl_default") - 1,
2498 .attr_get = posix_acl_default_get,
2499 .attr_set = posix_acl_default_set,
2500 .attr_remove = posix_acl_default_remove,
2501 .attr_exists = posix_acl_default_exists,
2502 };
2503
2504 static struct attrnames *attr_system_names[] =
2505 { &posix_acl_access, &posix_acl_default };
2506
2507
2508 /*========================================================================
2509 * Namespace-prefix-style attribute name interface routines.
2510 *========================================================================*/
2511
2512 STATIC int
2513 attr_generic_set(
2514 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2515 {
2516 return -xfs_attr_set(xfs_vtoi(vp), name, data, size, xflags);
2517 }
2518
2519 STATIC int
2520 attr_generic_get(
2521 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2522 {
2523 int error, asize = size;
2524
2525 error = xfs_attr_get(xfs_vtoi(vp), name, data,
2526 &asize, xflags, NULL);
2527 if (!error)
2528 return asize;
2529 return -error;
2530 }
2531
2532 STATIC int
2533 attr_generic_remove(
2534 bhv_vnode_t *vp, char *name, int xflags)
2535 {
2536 return -xfs_attr_remove(xfs_vtoi(vp), name, xflags);
2537 }
2538
2539 STATIC int
2540 attr_generic_listadd(
2541 attrnames_t *prefix,
2542 attrnames_t *namesp,
2543 void *data,
2544 size_t size,
2545 ssize_t *result)
2546 {
2547 char *p = data + *result;
2548
2549 *result += prefix->attr_namelen;
2550 *result += namesp->attr_namelen + 1;
2551 if (!size)
2552 return 0;
2553 if (*result > size)
2554 return -ERANGE;
2555 strcpy(p, prefix->attr_name);
2556 p += prefix->attr_namelen;
2557 strcpy(p, namesp->attr_name);
2558 p += namesp->attr_namelen + 1;
2559 return 0;
2560 }
2561
2562 STATIC int
2563 attr_system_list(
2564 bhv_vnode_t *vp,
2565 void *data,
2566 size_t size,
2567 ssize_t *result)
2568 {
2569 attrnames_t *namesp;
2570 int i, error = 0;
2571
2572 for (i = 0; i < ATTR_SYSCOUNT; i++) {
2573 namesp = attr_system_names[i];
2574 if (!namesp->attr_exists || !namesp->attr_exists(vp))
2575 continue;
2576 error = attr_generic_listadd(&attr_system, namesp,
2577 data, size, result);
2578 if (error)
2579 break;
2580 }
2581 return error;
2582 }
2583
2584 int
2585 attr_generic_list(
2586 bhv_vnode_t *vp, void *data, size_t size, int xflags, ssize_t *result)
2587 {
2588 attrlist_cursor_kern_t cursor = { 0 };
2589 int error;
2590
2591 error = xfs_attr_list(xfs_vtoi(vp), data, size, xflags, &cursor);
2592 if (error > 0)
2593 return -error;
2594 *result = -error;
2595 return attr_system_list(vp, data, size, result);
2596 }
2597
2598 attrnames_t *
2599 attr_lookup_namespace(
2600 char *name,
2601 struct attrnames **names,
2602 int nnames)
2603 {
2604 int i;
2605
2606 for (i = 0; i < nnames; i++)
2607 if (!strncmp(name, names[i]->attr_name, names[i]->attr_namelen))
2608 return names[i];
2609 return NULL;
2610 }
2611
2612 /*
2613 * Some checks to prevent people abusing EAs to get over quota:
2614 * - Don't allow modifying user EAs on devices/symlinks;
2615 * - Don't allow modifying user EAs if sticky bit set;
2616 */
2617 STATIC int
2618 attr_user_capable(
2619 bhv_vnode_t *vp,
2620 cred_t *cred)
2621 {
2622 struct inode *inode = vn_to_inode(vp);
2623
2624 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
2625 return -EPERM;
2626 if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode) &&
2627 !capable(CAP_SYS_ADMIN))
2628 return -EPERM;
2629 if (S_ISDIR(inode->i_mode) && (inode->i_mode & S_ISVTX) &&
2630 (current_fsuid(cred) != inode->i_uid) && !capable(CAP_FOWNER))
2631 return -EPERM;
2632 return 0;
2633 }
2634
2635 STATIC int
2636 attr_trusted_capable(
2637 bhv_vnode_t *vp,
2638 cred_t *cred)
2639 {
2640 struct inode *inode = vn_to_inode(vp);
2641
2642 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
2643 return -EPERM;
2644 if (!capable(CAP_SYS_ADMIN))
2645 return -EPERM;
2646 return 0;
2647 }
2648
2649 STATIC int
2650 attr_secure_capable(
2651 bhv_vnode_t *vp,
2652 cred_t *cred)
2653 {
2654 return -ENOSECURITY;
2655 }
2656
2657 STATIC int
2658 attr_system_set(
2659 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2660 {
2661 attrnames_t *namesp;
2662 int error;
2663
2664 if (xflags & ATTR_CREATE)
2665 return -EINVAL;
2666
2667 namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT);
2668 if (!namesp)
2669 return -EOPNOTSUPP;
2670 error = namesp->attr_set(vp, name, data, size, xflags);
2671 if (!error)
2672 error = vn_revalidate(vp);
2673 return error;
2674 }
2675
2676 STATIC int
2677 attr_system_get(
2678 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2679 {
2680 attrnames_t *namesp;
2681
2682 namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT);
2683 if (!namesp)
2684 return -EOPNOTSUPP;
2685 return namesp->attr_get(vp, name, data, size, xflags);
2686 }
2687
2688 STATIC int
2689 attr_system_remove(
2690 bhv_vnode_t *vp, char *name, int xflags)
2691 {
2692 attrnames_t *namesp;
2693
2694 namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT);
2695 if (!namesp)
2696 return -EOPNOTSUPP;
2697 return namesp->attr_remove(vp, name, xflags);
2698 }
2699
2700 struct attrnames attr_system = {
2701 .attr_name = "system.",
2702 .attr_namelen = sizeof("system.") - 1,
2703 .attr_flag = ATTR_SYSTEM,
2704 .attr_get = attr_system_get,
2705 .attr_set = attr_system_set,
2706 .attr_remove = attr_system_remove,
2707 .attr_capable = (attrcapable_t)fs_noerr,
2708 };
2709
2710 struct attrnames attr_trusted = {
2711 .attr_name = "trusted.",
2712 .attr_namelen = sizeof("trusted.") - 1,
2713 .attr_flag = ATTR_ROOT,
2714 .attr_get = attr_generic_get,
2715 .attr_set = attr_generic_set,
2716 .attr_remove = attr_generic_remove,
2717 .attr_capable = attr_trusted_capable,
2718 };
2719
2720 struct attrnames attr_secure = {
2721 .attr_name = "security.",
2722 .attr_namelen = sizeof("security.") - 1,
2723 .attr_flag = ATTR_SECURE,
2724 .attr_get = attr_generic_get,
2725 .attr_set = attr_generic_set,
2726 .attr_remove = attr_generic_remove,
2727 .attr_capable = attr_secure_capable,
2728 };
2729
2730 struct attrnames attr_user = {
2731 .attr_name = "user.",
2732 .attr_namelen = sizeof("user.") - 1,
2733 .attr_get = attr_generic_get,
2734 .attr_set = attr_generic_set,
2735 .attr_remove = attr_generic_remove,
2736 .attr_capable = attr_user_capable,
2737 };
2738
2739 struct attrnames *attr_namespaces[] =
2740 { &attr_system, &attr_trusted, &attr_secure, &attr_user };
WRT350N Kernel Patches