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[POWERPC] mpc85xx_mds: select QUICC_ENGINE
[pv_ops_mirror.git] / fs / xfs / xfs_attr.c
blob7ce44a7b88a246de3effe15bd9ab8f0aa680b095
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 xfs_iunlock(dp, XFS_ILOCK_EXCL);
333
334 /*
335 * Hit the inode change time.
336 */
337 if (!error && (flags & ATTR_KERNOTIME) == 0) {
338 xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
339 }
340 return(error == 0 ? err2 : error);
341 }
342
343 /*
344 * It won't fit in the shortform, transform to a leaf block.
345 * GROT: another possible req'mt for a double-split btree op.
346 */
347 XFS_BMAP_INIT(args.flist, args.firstblock);
348 error = xfs_attr_shortform_to_leaf(&args);
349 if (!error) {
350 error = xfs_bmap_finish(&args.trans, args.flist,
351 &committed);
352 }
353 if (error) {
354 ASSERT(committed);
355 args.trans = NULL;
356 xfs_bmap_cancel(&flist);
357 goto out;
358 }
359
360 /*
361 * bmap_finish() may have committed the last trans and started
362 * a new one. We need the inode to be in all transactions.
363 */
364 if (committed) {
365 xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
366 xfs_trans_ihold(args.trans, dp);
367 }
368
369 /*
370 * Commit the leaf transformation. We'll need another (linked)
371 * transaction to add the new attribute to the leaf.
372 */
373 if ((error = xfs_attr_rolltrans(&args.trans, dp)))
374 goto out;
375
376 }
377
378 if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
379 error = xfs_attr_leaf_addname(&args);
380 } else {
381 error = xfs_attr_node_addname(&args);
382 }
383 if (error) {
384 goto out;
385 }
386
387 /*
388 * If this is a synchronous mount, make sure that the
389 * transaction goes to disk before returning to the user.
390 */
391 if (mp->m_flags & XFS_MOUNT_WSYNC) {
392 xfs_trans_set_sync(args.trans);
393 }
394
395 /*
396 * Commit the last in the sequence of transactions.
397 */
398 xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
399 error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES);
400 xfs_iunlock(dp, XFS_ILOCK_EXCL);
401
402 /*
403 * Hit the inode change time.
404 */
405 if (!error && (flags & ATTR_KERNOTIME) == 0) {
406 xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
407 }
408
409 return(error);
410
411 out:
412 if (args.trans)
413 xfs_trans_cancel(args.trans,
414 XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
415 xfs_iunlock(dp, XFS_ILOCK_EXCL);
416 return(error);
417 }
418
419 int
420 xfs_attr_set(bhv_desc_t *bdp, const char *name, char *value, int valuelen, int flags,
421 struct cred *cred)
422 {
423 xfs_inode_t *dp;
424 int namelen;
425
426 namelen = strlen(name);
427 if (namelen >= MAXNAMELEN)
428 return EFAULT; /* match IRIX behaviour */
429
430 XFS_STATS_INC(xs_attr_set);
431
432 dp = XFS_BHVTOI(bdp);
433 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
434 return (EIO);
435
436 return xfs_attr_set_int(dp, name, namelen, value, valuelen, flags);
437 }
438
439 /*
440 * Generic handler routine to remove a name from an attribute list.
441 * Transitions attribute list from Btree to shortform as necessary.
442 */
443 int
444 xfs_attr_remove_int(xfs_inode_t *dp, const char *name, int namelen, int flags)
445 {
446 xfs_da_args_t args;
447 xfs_fsblock_t firstblock;
448 xfs_bmap_free_t flist;
449 int error;
450 xfs_mount_t *mp = dp->i_mount;
451
452 /*
453 * Fill in the arg structure for this request.
454 */
455 memset((char *)&args, 0, sizeof(args));
456 args.name = name;
457 args.namelen = namelen;
458 args.flags = flags;
459 args.hashval = xfs_da_hashname(args.name, args.namelen);
460 args.dp = dp;
461 args.firstblock = &firstblock;
462 args.flist = &flist;
463 args.total = 0;
464 args.whichfork = XFS_ATTR_FORK;
465
466 /*
467 * Attach the dquots to the inode.
468 */
469 if ((error = XFS_QM_DQATTACH(mp, dp, 0)))
470 return (error);
471
472 /*
473 * Start our first transaction of the day.
474 *
475 * All future transactions during this code must be "chained" off
476 * this one via the trans_dup() call. All transactions will contain
477 * the inode, and the inode will always be marked with trans_ihold().
478 * Since the inode will be locked in all transactions, we must log
479 * the inode in every transaction to let it float upward through
480 * the log.
481 */
482 args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_RM);
483
484 /*
485 * Root fork attributes can use reserved data blocks for this
486 * operation if necessary
487 */
488
489 if (flags & ATTR_ROOT)
490 args.trans->t_flags |= XFS_TRANS_RESERVE;
491
492 if ((error = xfs_trans_reserve(args.trans,
493 XFS_ATTRRM_SPACE_RES(mp),
494 XFS_ATTRRM_LOG_RES(mp),
495 0, XFS_TRANS_PERM_LOG_RES,
496 XFS_ATTRRM_LOG_COUNT))) {
497 xfs_trans_cancel(args.trans, 0);
498 return(error);
499 }
500
501 xfs_ilock(dp, XFS_ILOCK_EXCL);
502 /*
503 * No need to make quota reservations here. We expect to release some
504 * blocks not allocate in the common case.
505 */
506 xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
507 xfs_trans_ihold(args.trans, dp);
508
509 /*
510 * Decide on what work routines to call based on the inode size.
511 */
512 if (XFS_IFORK_Q(dp) == 0 ||
513 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
514 dp->i_d.di_anextents == 0)) {
515 error = XFS_ERROR(ENOATTR);
516 goto out;
517 }
518 if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
519 ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
520 error = xfs_attr_shortform_remove(&args);
521 if (error) {
522 goto out;
523 }
524 } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
525 error = xfs_attr_leaf_removename(&args);
526 } else {
527 error = xfs_attr_node_removename(&args);
528 }
529 if (error) {
530 goto out;
531 }
532
533 /*
534 * If this is a synchronous mount, make sure that the
535 * transaction goes to disk before returning to the user.
536 */
537 if (mp->m_flags & XFS_MOUNT_WSYNC) {
538 xfs_trans_set_sync(args.trans);
539 }
540
541 /*
542 * Commit the last in the sequence of transactions.
543 */
544 xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
545 error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES);
546 xfs_iunlock(dp, XFS_ILOCK_EXCL);
547
548 /*
549 * Hit the inode change time.
550 */
551 if (!error && (flags & ATTR_KERNOTIME) == 0) {
552 xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
553 }
554
555 return(error);
556
557 out:
558 if (args.trans)
559 xfs_trans_cancel(args.trans,
560 XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
561 xfs_iunlock(dp, XFS_ILOCK_EXCL);
562 return(error);
563 }
564
565 int
566 xfs_attr_remove(bhv_desc_t *bdp, const char *name, int flags, struct cred *cred)
567 {
568 xfs_inode_t *dp;
569 int namelen;
570
571 namelen = strlen(name);
572 if (namelen >= MAXNAMELEN)
573 return EFAULT; /* match IRIX behaviour */
574
575 XFS_STATS_INC(xs_attr_remove);
576
577 dp = XFS_BHVTOI(bdp);
578 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
579 return (EIO);
580
581 xfs_ilock(dp, XFS_ILOCK_SHARED);
582 if (XFS_IFORK_Q(dp) == 0 ||
583 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
584 dp->i_d.di_anextents == 0)) {
585 xfs_iunlock(dp, XFS_ILOCK_SHARED);
586 return(XFS_ERROR(ENOATTR));
587 }
588 xfs_iunlock(dp, XFS_ILOCK_SHARED);
589
590 return xfs_attr_remove_int(dp, name, namelen, flags);
591 }
592
593 int /* error */
594 xfs_attr_list_int(xfs_attr_list_context_t *context)
595 {
596 int error;
597 xfs_inode_t *dp = context->dp;
598
599 /*
600 * Decide on what work routines to call based on the inode size.
601 */
602 if (XFS_IFORK_Q(dp) == 0 ||
603 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
604 dp->i_d.di_anextents == 0)) {
605 error = 0;
606 } else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
607 error = xfs_attr_shortform_list(context);
608 } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
609 error = xfs_attr_leaf_list(context);
610 } else {
611 error = xfs_attr_node_list(context);
612 }
613 return error;
614 }
615
616 #define ATTR_ENTBASESIZE /* minimum bytes used by an attr */ \
617 (((struct attrlist_ent *) 0)->a_name - (char *) 0)
618 #define ATTR_ENTSIZE(namelen) /* actual bytes used by an attr */ \
619 ((ATTR_ENTBASESIZE + (namelen) + 1 + sizeof(u_int32_t)-1) \
620 & ~(sizeof(u_int32_t)-1))
621
622 /*
623 * Format an attribute and copy it out to the user's buffer.
624 * Take care to check values and protect against them changing later,
625 * we may be reading them directly out of a user buffer.
626 */
627 /*ARGSUSED*/
628 STATIC int
629 xfs_attr_put_listent(xfs_attr_list_context_t *context, attrnames_t *namesp,
630 char *name, int namelen,
631 int valuelen, char *value)
632 {
633 attrlist_ent_t *aep;
634 int arraytop;
635
636 ASSERT(!(context->flags & ATTR_KERNOVAL));
637 ASSERT(context->count >= 0);
638 ASSERT(context->count < (ATTR_MAX_VALUELEN/8));
639 ASSERT(context->firstu >= sizeof(*context->alist));
640 ASSERT(context->firstu <= context->bufsize);
641
642 arraytop = sizeof(*context->alist) +
643 context->count * sizeof(context->alist->al_offset[0]);
644 context->firstu -= ATTR_ENTSIZE(namelen);
645 if (context->firstu < arraytop) {
646 xfs_attr_trace_l_c("buffer full", context);
647 context->alist->al_more = 1;
648 context->seen_enough = 1;
649 return 1;
650 }
651
652 aep = (attrlist_ent_t *)&(((char *)context->alist)[ context->firstu ]);
653 aep->a_valuelen = valuelen;
654 memcpy(aep->a_name, name, namelen);
655 aep->a_name[ namelen ] = 0;
656 context->alist->al_offset[ context->count++ ] = context->firstu;
657 context->alist->al_count = context->count;
658 xfs_attr_trace_l_c("add", context);
659 return 0;
660 }
661
662 STATIC int
663 xfs_attr_kern_list(xfs_attr_list_context_t *context, attrnames_t *namesp,
664 char *name, int namelen,
665 int valuelen, char *value)
666 {
667 char *offset;
668 int arraytop;
669
670 ASSERT(context->count >= 0);
671
672 arraytop = context->count + namesp->attr_namelen + namelen + 1;
673 if (arraytop > context->firstu) {
674 context->count = -1; /* insufficient space */
675 return 1;
676 }
677 offset = (char *)context->alist + context->count;
678 strncpy(offset, namesp->attr_name, namesp->attr_namelen);
679 offset += namesp->attr_namelen;
680 strncpy(offset, name, namelen); /* real name */
681 offset += namelen;
682 *offset = '\0';
683 context->count += namesp->attr_namelen + namelen + 1;
684 return 0;
685 }
686
687 /*ARGSUSED*/
688 STATIC int
689 xfs_attr_kern_list_sizes(xfs_attr_list_context_t *context, attrnames_t *namesp,
690 char *name, int namelen,
691 int valuelen, char *value)
692 {
693 context->count += namesp->attr_namelen + namelen + 1;
694 return 0;
695 }
696
697 /*
698 * Generate a list of extended attribute names and optionally
699 * also value lengths. Positive return value follows the XFS
700 * convention of being an error, zero or negative return code
701 * is the length of the buffer returned (negated), indicating
702 * success.
703 */
704 int
705 xfs_attr_list(bhv_desc_t *bdp, char *buffer, int bufsize, int flags,
706 attrlist_cursor_kern_t *cursor, struct cred *cred)
707 {
708 xfs_attr_list_context_t context;
709 xfs_inode_t *dp;
710 int error;
711
712 XFS_STATS_INC(xs_attr_list);
713
714 /*
715 * Validate the cursor.
716 */
717 if (cursor->pad1 || cursor->pad2)
718 return(XFS_ERROR(EINVAL));
719 if ((cursor->initted == 0) &&
720 (cursor->hashval || cursor->blkno || cursor->offset))
721 return XFS_ERROR(EINVAL);
722
723 /*
724 * Check for a properly aligned buffer.
725 */
726 if (((long)buffer) & (sizeof(int)-1))
727 return XFS_ERROR(EFAULT);
728 if (flags & ATTR_KERNOVAL)
729 bufsize = 0;
730
731 /*
732 * Initialize the output buffer.
733 */
734 context.dp = dp = XFS_BHVTOI(bdp);
735 context.cursor = cursor;
736 context.count = 0;
737 context.dupcnt = 0;
738 context.resynch = 1;
739 context.flags = flags;
740 context.seen_enough = 0;
741 context.alist = (attrlist_t *)buffer;
742 context.put_value = 0;
743
744 if (flags & ATTR_KERNAMELS) {
745 context.bufsize = bufsize;
746 context.firstu = context.bufsize;
747 if (flags & ATTR_KERNOVAL)
748 context.put_listent = xfs_attr_kern_list_sizes;
749 else
750 context.put_listent = xfs_attr_kern_list;
751 } else {
752 context.bufsize = (bufsize & ~(sizeof(int)-1)); /* align */
753 context.firstu = context.bufsize;
754 context.alist->al_count = 0;
755 context.alist->al_more = 0;
756 context.alist->al_offset[0] = context.bufsize;
757 context.put_listent = xfs_attr_put_listent;
758 }
759
760 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
761 return EIO;
762
763 xfs_ilock(dp, XFS_ILOCK_SHARED);
764 xfs_attr_trace_l_c("syscall start", &context);
765
766 error = xfs_attr_list_int(&context);
767
768 xfs_iunlock(dp, XFS_ILOCK_SHARED);
769 xfs_attr_trace_l_c("syscall end", &context);
770
771 if (context.flags & (ATTR_KERNOVAL|ATTR_KERNAMELS)) {
772 /* must return negated buffer size or the error */
773 if (context.count < 0)
774 error = XFS_ERROR(ERANGE);
775 else
776 error = -context.count;
777 } else
778 ASSERT(error >= 0);
779
780 return error;
781 }
782
783 int /* error */
784 xfs_attr_inactive(xfs_inode_t *dp)
785 {
786 xfs_trans_t *trans;
787 xfs_mount_t *mp;
788 int error;
789
790 mp = dp->i_mount;
791 ASSERT(! XFS_NOT_DQATTACHED(mp, dp));
792
793 xfs_ilock(dp, XFS_ILOCK_SHARED);
794 if ((XFS_IFORK_Q(dp) == 0) ||
795 (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
796 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
797 dp->i_d.di_anextents == 0)) {
798 xfs_iunlock(dp, XFS_ILOCK_SHARED);
799 return(0);
800 }
801 xfs_iunlock(dp, XFS_ILOCK_SHARED);
802
803 /*
804 * Start our first transaction of the day.
805 *
806 * All future transactions during this code must be "chained" off
807 * this one via the trans_dup() call. All transactions will contain
808 * the inode, and the inode will always be marked with trans_ihold().
809 * Since the inode will be locked in all transactions, we must log
810 * the inode in every transaction to let it float upward through
811 * the log.
812 */
813 trans = xfs_trans_alloc(mp, XFS_TRANS_ATTRINVAL);
814 if ((error = xfs_trans_reserve(trans, 0, XFS_ATTRINVAL_LOG_RES(mp), 0,
815 XFS_TRANS_PERM_LOG_RES,
816 XFS_ATTRINVAL_LOG_COUNT))) {
817 xfs_trans_cancel(trans, 0);
818 return(error);
819 }
820 xfs_ilock(dp, XFS_ILOCK_EXCL);
821
822 /*
823 * No need to make quota reservations here. We expect to release some
824 * blocks, not allocate, in the common case.
825 */
826 xfs_trans_ijoin(trans, dp, XFS_ILOCK_EXCL);
827 xfs_trans_ihold(trans, dp);
828
829 /*
830 * Decide on what work routines to call based on the inode size.
831 */
832 if ((XFS_IFORK_Q(dp) == 0) ||
833 (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
834 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
835 dp->i_d.di_anextents == 0)) {
836 error = 0;
837 goto out;
838 }
839 error = xfs_attr_root_inactive(&trans, dp);
840 if (error)
841 goto out;
842 /*
843 * signal synchronous inactive transactions unless this
844 * is a synchronous mount filesystem in which case we
845 * know that we're here because we've been called out of
846 * xfs_inactive which means that the last reference is gone
847 * and the unlink transaction has already hit the disk so
848 * async inactive transactions are safe.
849 */
850 if ((error = xfs_itruncate_finish(&trans, dp, 0LL, XFS_ATTR_FORK,
851 (!(mp->m_flags & XFS_MOUNT_WSYNC)
852 ? 1 : 0))))
853 goto out;
854
855 /*
856 * Commit the last in the sequence of transactions.
857 */
858 xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
859 error = xfs_trans_commit(trans, XFS_TRANS_RELEASE_LOG_RES);
860 xfs_iunlock(dp, XFS_ILOCK_EXCL);
861
862 return(error);
863
864 out:
865 xfs_trans_cancel(trans, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
866 xfs_iunlock(dp, XFS_ILOCK_EXCL);
867 return(error);
868 }
869
870
871
872 /*========================================================================
873 * External routines when attribute list is inside the inode
874 *========================================================================*/
875
876 /*
877 * Add a name to the shortform attribute list structure
878 * This is the external routine.
879 */
880 STATIC int
881 xfs_attr_shortform_addname(xfs_da_args_t *args)
882 {
883 int newsize, forkoff, retval;
884
885 retval = xfs_attr_shortform_lookup(args);
886 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
887 return(retval);
888 } else if (retval == EEXIST) {
889 if (args->flags & ATTR_CREATE)
890 return(retval);
891 retval = xfs_attr_shortform_remove(args);
892 ASSERT(retval == 0);
893 }
894
895 if (args->namelen >= XFS_ATTR_SF_ENTSIZE_MAX ||
896 args->valuelen >= XFS_ATTR_SF_ENTSIZE_MAX)
897 return(XFS_ERROR(ENOSPC));
898
899 newsize = XFS_ATTR_SF_TOTSIZE(args->dp);
900 newsize += XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
901
902 forkoff = xfs_attr_shortform_bytesfit(args->dp, newsize);
903 if (!forkoff)
904 return(XFS_ERROR(ENOSPC));
905
906 xfs_attr_shortform_add(args, forkoff);
907 return(0);
908 }
909
910
911 /*========================================================================
912 * External routines when attribute list is one block
913 *========================================================================*/
914
915 /*
916 * Add a name to the leaf attribute list structure
917 *
918 * This leaf block cannot have a "remote" value, we only call this routine
919 * if bmap_one_block() says there is only one block (ie: no remote blks).
920 */
921 int
922 xfs_attr_leaf_addname(xfs_da_args_t *args)
923 {
924 xfs_inode_t *dp;
925 xfs_dabuf_t *bp;
926 int retval, error, committed, forkoff;
927
928 /*
929 * Read the (only) block in the attribute list in.
930 */
931 dp = args->dp;
932 args->blkno = 0;
933 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
934 XFS_ATTR_FORK);
935 if (error)
936 return(error);
937 ASSERT(bp != NULL);
938
939 /*
940 * Look up the given attribute in the leaf block. Figure out if
941 * the given flags produce an error or call for an atomic rename.
942 */
943 retval = xfs_attr_leaf_lookup_int(bp, args);
944 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
945 xfs_da_brelse(args->trans, bp);
946 return(retval);
947 } else if (retval == EEXIST) {
948 if (args->flags & ATTR_CREATE) { /* pure create op */
949 xfs_da_brelse(args->trans, bp);
950 return(retval);
951 }
952 args->rename = 1; /* an atomic rename */
953 args->blkno2 = args->blkno; /* set 2nd entry info*/
954 args->index2 = args->index;
955 args->rmtblkno2 = args->rmtblkno;
956 args->rmtblkcnt2 = args->rmtblkcnt;
957 }
958
959 /*
960 * Add the attribute to the leaf block, transitioning to a Btree
961 * if required.
962 */
963 retval = xfs_attr_leaf_add(bp, args);
964 xfs_da_buf_done(bp);
965 if (retval == ENOSPC) {
966 /*
967 * Promote the attribute list to the Btree format, then
968 * Commit that transaction so that the node_addname() call
969 * can manage its own transactions.
970 */
971 XFS_BMAP_INIT(args->flist, args->firstblock);
972 error = xfs_attr_leaf_to_node(args);
973 if (!error) {
974 error = xfs_bmap_finish(&args->trans, args->flist,
975 &committed);
976 }
977 if (error) {
978 ASSERT(committed);
979 args->trans = NULL;
980 xfs_bmap_cancel(args->flist);
981 return(error);
982 }
983
984 /*
985 * bmap_finish() may have committed the last trans and started
986 * a new one. We need the inode to be in all transactions.
987 */
988 if (committed) {
989 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
990 xfs_trans_ihold(args->trans, dp);
991 }
992
993 /*
994 * Commit the current trans (including the inode) and start
995 * a new one.
996 */
997 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
998 return (error);
999
1000 /*
1001 * Fob the whole rest of the problem off on the Btree code.
1002 */
1003 error = xfs_attr_node_addname(args);
1004 return(error);
1005 }
1006
1007 /*
1008 * Commit the transaction that added the attr name so that
1009 * later routines can manage their own transactions.
1010 */
1011 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1012 return (error);
1013
1014 /*
1015 * If there was an out-of-line value, allocate the blocks we
1016 * identified for its storage and copy the value. This is done
1017 * after we create the attribute so that we don't overflow the
1018 * maximum size of a transaction and/or hit a deadlock.
1019 */
1020 if (args->rmtblkno > 0) {
1021 error = xfs_attr_rmtval_set(args);
1022 if (error)
1023 return(error);
1024 }
1025
1026 /*
1027 * If this is an atomic rename operation, we must "flip" the
1028 * incomplete flags on the "new" and "old" attribute/value pairs
1029 * so that one disappears and one appears atomically. Then we
1030 * must remove the "old" attribute/value pair.
1031 */
1032 if (args->rename) {
1033 /*
1034 * In a separate transaction, set the incomplete flag on the
1035 * "old" attr and clear the incomplete flag on the "new" attr.
1036 */
1037 error = xfs_attr_leaf_flipflags(args);
1038 if (error)
1039 return(error);
1040
1041 /*
1042 * Dismantle the "old" attribute/value pair by removing
1043 * a "remote" value (if it exists).
1044 */
1045 args->index = args->index2;
1046 args->blkno = args->blkno2;
1047 args->rmtblkno = args->rmtblkno2;
1048 args->rmtblkcnt = args->rmtblkcnt2;
1049 if (args->rmtblkno) {
1050 error = xfs_attr_rmtval_remove(args);
1051 if (error)
1052 return(error);
1053 }
1054
1055 /*
1056 * Read in the block containing the "old" attr, then
1057 * remove the "old" attr from that block (neat, huh!)
1058 */
1059 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1,
1060 &bp, XFS_ATTR_FORK);
1061 if (error)
1062 return(error);
1063 ASSERT(bp != NULL);
1064 (void)xfs_attr_leaf_remove(bp, args);
1065
1066 /*
1067 * If the result is small enough, shrink it all into the inode.
1068 */
1069 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1070 XFS_BMAP_INIT(args->flist, args->firstblock);
1071 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1072 /* bp is gone due to xfs_da_shrink_inode */
1073 if (!error) {
1074 error = xfs_bmap_finish(&args->trans,
1075 args->flist,
1076 &committed);
1077 }
1078 if (error) {
1079 ASSERT(committed);
1080 args->trans = NULL;
1081 xfs_bmap_cancel(args->flist);
1082 return(error);
1083 }
1084
1085 /*
1086 * bmap_finish() may have committed the last trans
1087 * and started a new one. We need the inode to be
1088 * in all transactions.
1089 */
1090 if (committed) {
1091 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1092 xfs_trans_ihold(args->trans, dp);
1093 }
1094 } else
1095 xfs_da_buf_done(bp);
1096
1097 /*
1098 * Commit the remove and start the next trans in series.
1099 */
1100 error = xfs_attr_rolltrans(&args->trans, dp);
1101
1102 } else if (args->rmtblkno > 0) {
1103 /*
1104 * Added a "remote" value, just clear the incomplete flag.
1105 */
1106 error = xfs_attr_leaf_clearflag(args);
1107 }
1108 return(error);
1109 }
1110
1111 /*
1112 * Remove a name from the leaf attribute list structure
1113 *
1114 * This leaf block cannot have a "remote" value, we only call this routine
1115 * if bmap_one_block() says there is only one block (ie: no remote blks).
1116 */
1117 STATIC int
1118 xfs_attr_leaf_removename(xfs_da_args_t *args)
1119 {
1120 xfs_inode_t *dp;
1121 xfs_dabuf_t *bp;
1122 int error, committed, forkoff;
1123
1124 /*
1125 * Remove the attribute.
1126 */
1127 dp = args->dp;
1128 args->blkno = 0;
1129 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
1130 XFS_ATTR_FORK);
1131 if (error) {
1132 return(error);
1133 }
1134
1135 ASSERT(bp != NULL);
1136 error = xfs_attr_leaf_lookup_int(bp, args);
1137 if (error == ENOATTR) {
1138 xfs_da_brelse(args->trans, bp);
1139 return(error);
1140 }
1141
1142 (void)xfs_attr_leaf_remove(bp, args);
1143
1144 /*
1145 * If the result is small enough, shrink it all into the inode.
1146 */
1147 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1148 XFS_BMAP_INIT(args->flist, args->firstblock);
1149 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1150 /* bp is gone due to xfs_da_shrink_inode */
1151 if (!error) {
1152 error = xfs_bmap_finish(&args->trans, args->flist,
1153 &committed);
1154 }
1155 if (error) {
1156 ASSERT(committed);
1157 args->trans = NULL;
1158 xfs_bmap_cancel(args->flist);
1159 return(error);
1160 }
1161
1162 /*
1163 * bmap_finish() may have committed the last trans and started
1164 * a new one. We need the inode to be in all transactions.
1165 */
1166 if (committed) {
1167 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1168 xfs_trans_ihold(args->trans, dp);
1169 }
1170 } else
1171 xfs_da_buf_done(bp);
1172 return(0);
1173 }
1174
1175 /*
1176 * Look up a name in a leaf attribute list structure.
1177 *
1178 * This leaf block cannot have a "remote" value, we only call this routine
1179 * if bmap_one_block() says there is only one block (ie: no remote blks).
1180 */
1181 STATIC int
1182 xfs_attr_leaf_get(xfs_da_args_t *args)
1183 {
1184 xfs_dabuf_t *bp;
1185 int error;
1186
1187 args->blkno = 0;
1188 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
1189 XFS_ATTR_FORK);
1190 if (error)
1191 return(error);
1192 ASSERT(bp != NULL);
1193
1194 error = xfs_attr_leaf_lookup_int(bp, args);
1195 if (error != EEXIST) {
1196 xfs_da_brelse(args->trans, bp);
1197 return(error);
1198 }
1199 error = xfs_attr_leaf_getvalue(bp, args);
1200 xfs_da_brelse(args->trans, bp);
1201 if (!error && (args->rmtblkno > 0) && !(args->flags & ATTR_KERNOVAL)) {
1202 error = xfs_attr_rmtval_get(args);
1203 }
1204 return(error);
1205 }
1206
1207 /*
1208 * Copy out attribute entries for attr_list(), for leaf attribute lists.
1209 */
1210 STATIC int
1211 xfs_attr_leaf_list(xfs_attr_list_context_t *context)
1212 {
1213 xfs_attr_leafblock_t *leaf;
1214 int error;
1215 xfs_dabuf_t *bp;
1216
1217 context->cursor->blkno = 0;
1218 error = xfs_da_read_buf(NULL, context->dp, 0, -1, &bp, XFS_ATTR_FORK);
1219 if (error)
1220 return XFS_ERROR(error);
1221 ASSERT(bp != NULL);
1222 leaf = bp->data;
1223 if (unlikely(be16_to_cpu(leaf->hdr.info.magic) != XFS_ATTR_LEAF_MAGIC)) {
1224 XFS_CORRUPTION_ERROR("xfs_attr_leaf_list", XFS_ERRLEVEL_LOW,
1225 context->dp->i_mount, leaf);
1226 xfs_da_brelse(NULL, bp);
1227 return XFS_ERROR(EFSCORRUPTED);
1228 }
1229
1230 error = xfs_attr_leaf_list_int(bp, context);
1231 xfs_da_brelse(NULL, bp);
1232 return XFS_ERROR(error);
1233 }
1234
1235
1236 /*========================================================================
1237 * External routines when attribute list size > XFS_LBSIZE(mp).
1238 *========================================================================*/
1239
1240 /*
1241 * Add a name to a Btree-format attribute list.
1242 *
1243 * This will involve walking down the Btree, and may involve splitting
1244 * leaf nodes and even splitting intermediate nodes up to and including
1245 * the root node (a special case of an intermediate node).
1246 *
1247 * "Remote" attribute values confuse the issue and atomic rename operations
1248 * add a whole extra layer of confusion on top of that.
1249 */
1250 STATIC int
1251 xfs_attr_node_addname(xfs_da_args_t *args)
1252 {
1253 xfs_da_state_t *state;
1254 xfs_da_state_blk_t *blk;
1255 xfs_inode_t *dp;
1256 xfs_mount_t *mp;
1257 int committed, retval, error;
1258
1259 /*
1260 * Fill in bucket of arguments/results/context to carry around.
1261 */
1262 dp = args->dp;
1263 mp = dp->i_mount;
1264 restart:
1265 state = xfs_da_state_alloc();
1266 state->args = args;
1267 state->mp = mp;
1268 state->blocksize = state->mp->m_sb.sb_blocksize;
1269 state->node_ents = state->mp->m_attr_node_ents;
1270
1271 /*
1272 * Search to see if name already exists, and get back a pointer
1273 * to where it should go.
1274 */
1275 error = xfs_da_node_lookup_int(state, &retval);
1276 if (error)
1277 goto out;
1278 blk = &state->path.blk[ state->path.active-1 ];
1279 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1280 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
1281 goto out;
1282 } else if (retval == EEXIST) {
1283 if (args->flags & ATTR_CREATE)
1284 goto out;
1285 args->rename = 1; /* atomic rename op */
1286 args->blkno2 = args->blkno; /* set 2nd entry info*/
1287 args->index2 = args->index;
1288 args->rmtblkno2 = args->rmtblkno;
1289 args->rmtblkcnt2 = args->rmtblkcnt;
1290 args->rmtblkno = 0;
1291 args->rmtblkcnt = 0;
1292 }
1293
1294 retval = xfs_attr_leaf_add(blk->bp, state->args);
1295 if (retval == ENOSPC) {
1296 if (state->path.active == 1) {
1297 /*
1298 * Its really a single leaf node, but it had
1299 * out-of-line values so it looked like it *might*
1300 * have been a b-tree.
1301 */
1302 xfs_da_state_free(state);
1303 XFS_BMAP_INIT(args->flist, args->firstblock);
1304 error = xfs_attr_leaf_to_node(args);
1305 if (!error) {
1306 error = xfs_bmap_finish(&args->trans,
1307 args->flist,
1308 &committed);
1309 }
1310 if (error) {
1311 ASSERT(committed);
1312 args->trans = NULL;
1313 xfs_bmap_cancel(args->flist);
1314 goto out;
1315 }
1316
1317 /*
1318 * bmap_finish() may have committed the last trans
1319 * and started a new one. We need the inode to be
1320 * in all transactions.
1321 */
1322 if (committed) {
1323 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1324 xfs_trans_ihold(args->trans, dp);
1325 }
1326
1327 /*
1328 * Commit the node conversion and start the next
1329 * trans in the chain.
1330 */
1331 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1332 goto out;
1333
1334 goto restart;
1335 }
1336
1337 /*
1338 * Split as many Btree elements as required.
1339 * This code tracks the new and old attr's location
1340 * in the index/blkno/rmtblkno/rmtblkcnt fields and
1341 * in the index2/blkno2/rmtblkno2/rmtblkcnt2 fields.
1342 */
1343 XFS_BMAP_INIT(args->flist, args->firstblock);
1344 error = xfs_da_split(state);
1345 if (!error) {
1346 error = xfs_bmap_finish(&args->trans, args->flist,
1347 &committed);
1348 }
1349 if (error) {
1350 ASSERT(committed);
1351 args->trans = NULL;
1352 xfs_bmap_cancel(args->flist);
1353 goto out;
1354 }
1355
1356 /*
1357 * bmap_finish() may have committed the last trans and started
1358 * a new one. We need the inode to be in all transactions.
1359 */
1360 if (committed) {
1361 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1362 xfs_trans_ihold(args->trans, dp);
1363 }
1364 } else {
1365 /*
1366 * Addition succeeded, update Btree hashvals.
1367 */
1368 xfs_da_fixhashpath(state, &state->path);
1369 }
1370
1371 /*
1372 * Kill the state structure, we're done with it and need to
1373 * allow the buffers to come back later.
1374 */
1375 xfs_da_state_free(state);
1376 state = NULL;
1377
1378 /*
1379 * Commit the leaf addition or btree split and start the next
1380 * trans in the chain.
1381 */
1382 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1383 goto out;
1384
1385 /*
1386 * If there was an out-of-line value, allocate the blocks we
1387 * identified for its storage and copy the value. This is done
1388 * after we create the attribute so that we don't overflow the
1389 * maximum size of a transaction and/or hit a deadlock.
1390 */
1391 if (args->rmtblkno > 0) {
1392 error = xfs_attr_rmtval_set(args);
1393 if (error)
1394 return(error);
1395 }
1396
1397 /*
1398 * If this is an atomic rename operation, we must "flip" the
1399 * incomplete flags on the "new" and "old" attribute/value pairs
1400 * so that one disappears and one appears atomically. Then we
1401 * must remove the "old" attribute/value pair.
1402 */
1403 if (args->rename) {
1404 /*
1405 * In a separate transaction, set the incomplete flag on the
1406 * "old" attr and clear the incomplete flag on the "new" attr.
1407 */
1408 error = xfs_attr_leaf_flipflags(args);
1409 if (error)
1410 goto out;
1411
1412 /*
1413 * Dismantle the "old" attribute/value pair by removing
1414 * a "remote" value (if it exists).
1415 */
1416 args->index = args->index2;
1417 args->blkno = args->blkno2;
1418 args->rmtblkno = args->rmtblkno2;
1419 args->rmtblkcnt = args->rmtblkcnt2;
1420 if (args->rmtblkno) {
1421 error = xfs_attr_rmtval_remove(args);
1422 if (error)
1423 return(error);
1424 }
1425
1426 /*
1427 * Re-find the "old" attribute entry after any split ops.
1428 * The INCOMPLETE flag means that we will find the "old"
1429 * attr, not the "new" one.
1430 */
1431 args->flags |= XFS_ATTR_INCOMPLETE;
1432 state = xfs_da_state_alloc();
1433 state->args = args;
1434 state->mp = mp;
1435 state->blocksize = state->mp->m_sb.sb_blocksize;
1436 state->node_ents = state->mp->m_attr_node_ents;
1437 state->inleaf = 0;
1438 error = xfs_da_node_lookup_int(state, &retval);
1439 if (error)
1440 goto out;
1441
1442 /*
1443 * Remove the name and update the hashvals in the tree.
1444 */
1445 blk = &state->path.blk[ state->path.active-1 ];
1446 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1447 error = xfs_attr_leaf_remove(blk->bp, args);
1448 xfs_da_fixhashpath(state, &state->path);
1449
1450 /*
1451 * Check to see if the tree needs to be collapsed.
1452 */
1453 if (retval && (state->path.active > 1)) {
1454 XFS_BMAP_INIT(args->flist, args->firstblock);
1455 error = xfs_da_join(state);
1456 if (!error) {
1457 error = xfs_bmap_finish(&args->trans,
1458 args->flist,
1459 &committed);
1460 }
1461 if (error) {
1462 ASSERT(committed);
1463 args->trans = NULL;
1464 xfs_bmap_cancel(args->flist);
1465 goto out;
1466 }
1467
1468 /*
1469 * bmap_finish() may have committed the last trans
1470 * and started a new one. We need the inode to be
1471 * in all transactions.
1472 */
1473 if (committed) {
1474 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1475 xfs_trans_ihold(args->trans, dp);
1476 }
1477 }
1478
1479 /*
1480 * Commit and start the next trans in the chain.
1481 */
1482 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1483 goto out;
1484
1485 } else if (args->rmtblkno > 0) {
1486 /*
1487 * Added a "remote" value, just clear the incomplete flag.
1488 */
1489 error = xfs_attr_leaf_clearflag(args);
1490 if (error)
1491 goto out;
1492 }
1493 retval = error = 0;
1494
1495 out:
1496 if (state)
1497 xfs_da_state_free(state);
1498 if (error)
1499 return(error);
1500 return(retval);
1501 }
1502
1503 /*
1504 * Remove a name from a B-tree attribute list.
1505 *
1506 * This will involve walking down the Btree, and may involve joining
1507 * leaf nodes and even joining intermediate nodes up to and including
1508 * the root node (a special case of an intermediate node).
1509 */
1510 STATIC int
1511 xfs_attr_node_removename(xfs_da_args_t *args)
1512 {
1513 xfs_da_state_t *state;
1514 xfs_da_state_blk_t *blk;
1515 xfs_inode_t *dp;
1516 xfs_dabuf_t *bp;
1517 int retval, error, committed, forkoff;
1518
1519 /*
1520 * Tie a string around our finger to remind us where we are.
1521 */
1522 dp = args->dp;
1523 state = xfs_da_state_alloc();
1524 state->args = args;
1525 state->mp = dp->i_mount;
1526 state->blocksize = state->mp->m_sb.sb_blocksize;
1527 state->node_ents = state->mp->m_attr_node_ents;
1528
1529 /*
1530 * Search to see if name exists, and get back a pointer to it.
1531 */
1532 error = xfs_da_node_lookup_int(state, &retval);
1533 if (error || (retval != EEXIST)) {
1534 if (error == 0)
1535 error = retval;
1536 goto out;
1537 }
1538
1539 /*
1540 * If there is an out-of-line value, de-allocate the blocks.
1541 * This is done before we remove the attribute so that we don't
1542 * overflow the maximum size of a transaction and/or hit a deadlock.
1543 */
1544 blk = &state->path.blk[ state->path.active-1 ];
1545 ASSERT(blk->bp != NULL);
1546 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1547 if (args->rmtblkno > 0) {
1548 /*
1549 * Fill in disk block numbers in the state structure
1550 * so that we can get the buffers back after we commit
1551 * several transactions in the following calls.
1552 */
1553 error = xfs_attr_fillstate(state);
1554 if (error)
1555 goto out;
1556
1557 /*
1558 * Mark the attribute as INCOMPLETE, then bunmapi() the
1559 * remote value.
1560 */
1561 error = xfs_attr_leaf_setflag(args);
1562 if (error)
1563 goto out;
1564 error = xfs_attr_rmtval_remove(args);
1565 if (error)
1566 goto out;
1567
1568 /*
1569 * Refill the state structure with buffers, the prior calls
1570 * released our buffers.
1571 */
1572 error = xfs_attr_refillstate(state);
1573 if (error)
1574 goto out;
1575 }
1576
1577 /*
1578 * Remove the name and update the hashvals in the tree.
1579 */
1580 blk = &state->path.blk[ state->path.active-1 ];
1581 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1582 retval = xfs_attr_leaf_remove(blk->bp, args);
1583 xfs_da_fixhashpath(state, &state->path);
1584
1585 /*
1586 * Check to see if the tree needs to be collapsed.
1587 */
1588 if (retval && (state->path.active > 1)) {
1589 XFS_BMAP_INIT(args->flist, args->firstblock);
1590 error = xfs_da_join(state);
1591 if (!error) {
1592 error = xfs_bmap_finish(&args->trans, args->flist,
1593 &committed);
1594 }
1595 if (error) {
1596 ASSERT(committed);
1597 args->trans = NULL;
1598 xfs_bmap_cancel(args->flist);
1599 goto out;
1600 }
1601
1602 /*
1603 * bmap_finish() may have committed the last trans and started
1604 * a new one. We need the inode to be in all transactions.
1605 */
1606 if (committed) {
1607 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1608 xfs_trans_ihold(args->trans, dp);
1609 }
1610
1611 /*
1612 * Commit the Btree join operation and start a new trans.
1613 */
1614 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1615 goto out;
1616 }
1617
1618 /*
1619 * If the result is small enough, push it all into the inode.
1620 */
1621 if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
1622 /*
1623 * Have to get rid of the copy of this dabuf in the state.
1624 */
1625 ASSERT(state->path.active == 1);
1626 ASSERT(state->path.blk[0].bp);
1627 xfs_da_buf_done(state->path.blk[0].bp);
1628 state->path.blk[0].bp = NULL;
1629
1630 error = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp,
1631 XFS_ATTR_FORK);
1632 if (error)
1633 goto out;
1634 ASSERT(be16_to_cpu(((xfs_attr_leafblock_t *)
1635 bp->data)->hdr.info.magic)
1636 == XFS_ATTR_LEAF_MAGIC);
1637
1638 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1639 XFS_BMAP_INIT(args->flist, args->firstblock);
1640 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1641 /* bp is gone due to xfs_da_shrink_inode */
1642 if (!error) {
1643 error = xfs_bmap_finish(&args->trans,
1644 args->flist,
1645 &committed);
1646 }
1647 if (error) {
1648 ASSERT(committed);
1649 args->trans = NULL;
1650 xfs_bmap_cancel(args->flist);
1651 goto out;
1652 }
1653
1654 /*
1655 * bmap_finish() may have committed the last trans
1656 * and started a new one. We need the inode to be
1657 * in all transactions.
1658 */
1659 if (committed) {
1660 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1661 xfs_trans_ihold(args->trans, dp);
1662 }
1663 } else
1664 xfs_da_brelse(args->trans, bp);
1665 }
1666 error = 0;
1667
1668 out:
1669 xfs_da_state_free(state);
1670 return(error);
1671 }
1672
1673 /*
1674 * Fill in the disk block numbers in the state structure for the buffers
1675 * that are attached to the state structure.
1676 * This is done so that we can quickly reattach ourselves to those buffers
1677 * after some set of transaction commits have released these buffers.
1678 */
1679 STATIC int
1680 xfs_attr_fillstate(xfs_da_state_t *state)
1681 {
1682 xfs_da_state_path_t *path;
1683 xfs_da_state_blk_t *blk;
1684 int level;
1685
1686 /*
1687 * Roll down the "path" in the state structure, storing the on-disk
1688 * block number for those buffers in the "path".
1689 */
1690 path = &state->path;
1691 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1692 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1693 if (blk->bp) {
1694 blk->disk_blkno = xfs_da_blkno(blk->bp);
1695 xfs_da_buf_done(blk->bp);
1696 blk->bp = NULL;
1697 } else {
1698 blk->disk_blkno = 0;
1699 }
1700 }
1701
1702 /*
1703 * Roll down the "altpath" in the state structure, storing the on-disk
1704 * block number for those buffers in the "altpath".
1705 */
1706 path = &state->altpath;
1707 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1708 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1709 if (blk->bp) {
1710 blk->disk_blkno = xfs_da_blkno(blk->bp);
1711 xfs_da_buf_done(blk->bp);
1712 blk->bp = NULL;
1713 } else {
1714 blk->disk_blkno = 0;
1715 }
1716 }
1717
1718 return(0);
1719 }
1720
1721 /*
1722 * Reattach the buffers to the state structure based on the disk block
1723 * numbers stored in the state structure.
1724 * This is done after some set of transaction commits have released those
1725 * buffers from our grip.
1726 */
1727 STATIC int
1728 xfs_attr_refillstate(xfs_da_state_t *state)
1729 {
1730 xfs_da_state_path_t *path;
1731 xfs_da_state_blk_t *blk;
1732 int level, error;
1733
1734 /*
1735 * Roll down the "path" in the state structure, storing the on-disk
1736 * block number for those buffers in the "path".
1737 */
1738 path = &state->path;
1739 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1740 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1741 if (blk->disk_blkno) {
1742 error = xfs_da_read_buf(state->args->trans,
1743 state->args->dp,
1744 blk->blkno, blk->disk_blkno,
1745 &blk->bp, XFS_ATTR_FORK);
1746 if (error)
1747 return(error);
1748 } else {
1749 blk->bp = NULL;
1750 }
1751 }
1752
1753 /*
1754 * Roll down the "altpath" in the state structure, storing the on-disk
1755 * block number for those buffers in the "altpath".
1756 */
1757 path = &state->altpath;
1758 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1759 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1760 if (blk->disk_blkno) {
1761 error = xfs_da_read_buf(state->args->trans,
1762 state->args->dp,
1763 blk->blkno, blk->disk_blkno,
1764 &blk->bp, XFS_ATTR_FORK);
1765 if (error)
1766 return(error);
1767 } else {
1768 blk->bp = NULL;
1769 }
1770 }
1771
1772 return(0);
1773 }
1774
1775 /*
1776 * Look up a filename in a node attribute list.
1777 *
1778 * This routine gets called for any attribute fork that has more than one
1779 * block, ie: both true Btree attr lists and for single-leaf-blocks with
1780 * "remote" values taking up more blocks.
1781 */
1782 STATIC int
1783 xfs_attr_node_get(xfs_da_args_t *args)
1784 {
1785 xfs_da_state_t *state;
1786 xfs_da_state_blk_t *blk;
1787 int error, retval;
1788 int i;
1789
1790 state = xfs_da_state_alloc();
1791 state->args = args;
1792 state->mp = args->dp->i_mount;
1793 state->blocksize = state->mp->m_sb.sb_blocksize;
1794 state->node_ents = state->mp->m_attr_node_ents;
1795
1796 /*
1797 * Search to see if name exists, and get back a pointer to it.
1798 */
1799 error = xfs_da_node_lookup_int(state, &retval);
1800 if (error) {
1801 retval = error;
1802 } else if (retval == EEXIST) {
1803 blk = &state->path.blk[ state->path.active-1 ];
1804 ASSERT(blk->bp != NULL);
1805 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1806
1807 /*
1808 * Get the value, local or "remote"
1809 */
1810 retval = xfs_attr_leaf_getvalue(blk->bp, args);
1811 if (!retval && (args->rmtblkno > 0)
1812 && !(args->flags & ATTR_KERNOVAL)) {
1813 retval = xfs_attr_rmtval_get(args);
1814 }
1815 }
1816
1817 /*
1818 * If not in a transaction, we have to release all the buffers.
1819 */
1820 for (i = 0; i < state->path.active; i++) {
1821 xfs_da_brelse(args->trans, state->path.blk[i].bp);
1822 state->path.blk[i].bp = NULL;
1823 }
1824
1825 xfs_da_state_free(state);
1826 return(retval);
1827 }
1828
1829 STATIC int /* error */
1830 xfs_attr_node_list(xfs_attr_list_context_t *context)
1831 {
1832 attrlist_cursor_kern_t *cursor;
1833 xfs_attr_leafblock_t *leaf;
1834 xfs_da_intnode_t *node;
1835 xfs_da_node_entry_t *btree;
1836 int error, i;
1837 xfs_dabuf_t *bp;
1838
1839 cursor = context->cursor;
1840 cursor->initted = 1;
1841
1842 /*
1843 * Do all sorts of validation on the passed-in cursor structure.
1844 * If anything is amiss, ignore the cursor and look up the hashval
1845 * starting from the btree root.
1846 */
1847 bp = NULL;
1848 if (cursor->blkno > 0) {
1849 error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
1850 &bp, XFS_ATTR_FORK);
1851 if ((error != 0) && (error != EFSCORRUPTED))
1852 return(error);
1853 if (bp) {
1854 node = bp->data;
1855 switch (be16_to_cpu(node->hdr.info.magic)) {
1856 case XFS_DA_NODE_MAGIC:
1857 xfs_attr_trace_l_cn("wrong blk", context, node);
1858 xfs_da_brelse(NULL, bp);
1859 bp = NULL;
1860 break;
1861 case XFS_ATTR_LEAF_MAGIC:
1862 leaf = bp->data;
1863 if (cursor->hashval > be32_to_cpu(leaf->entries[
1864 be16_to_cpu(leaf->hdr.count)-1].hashval)) {
1865 xfs_attr_trace_l_cl("wrong blk",
1866 context, leaf);
1867 xfs_da_brelse(NULL, bp);
1868 bp = NULL;
1869 } else if (cursor->hashval <=
1870 be32_to_cpu(leaf->entries[0].hashval)) {
1871 xfs_attr_trace_l_cl("maybe wrong blk",
1872 context, leaf);
1873 xfs_da_brelse(NULL, bp);
1874 bp = NULL;
1875 }
1876 break;
1877 default:
1878 xfs_attr_trace_l_c("wrong blk - ??", context);
1879 xfs_da_brelse(NULL, bp);
1880 bp = NULL;
1881 }
1882 }
1883 }
1884
1885 /*
1886 * We did not find what we expected given the cursor's contents,
1887 * so we start from the top and work down based on the hash value.
1888 * Note that start of node block is same as start of leaf block.
1889 */
1890 if (bp == NULL) {
1891 cursor->blkno = 0;
1892 for (;;) {
1893 error = xfs_da_read_buf(NULL, context->dp,
1894 cursor->blkno, -1, &bp,
1895 XFS_ATTR_FORK);
1896 if (error)
1897 return(error);
1898 if (unlikely(bp == NULL)) {
1899 XFS_ERROR_REPORT("xfs_attr_node_list(2)",
1900 XFS_ERRLEVEL_LOW,
1901 context->dp->i_mount);
1902 return(XFS_ERROR(EFSCORRUPTED));
1903 }
1904 node = bp->data;
1905 if (be16_to_cpu(node->hdr.info.magic)
1906 == XFS_ATTR_LEAF_MAGIC)
1907 break;
1908 if (unlikely(be16_to_cpu(node->hdr.info.magic)
1909 != XFS_DA_NODE_MAGIC)) {
1910 XFS_CORRUPTION_ERROR("xfs_attr_node_list(3)",
1911 XFS_ERRLEVEL_LOW,
1912 context->dp->i_mount,
1913 node);
1914 xfs_da_brelse(NULL, bp);
1915 return(XFS_ERROR(EFSCORRUPTED));
1916 }
1917 btree = node->btree;
1918 for (i = 0; i < be16_to_cpu(node->hdr.count);
1919 btree++, i++) {
1920 if (cursor->hashval
1921 <= be32_to_cpu(btree->hashval)) {
1922 cursor->blkno = be32_to_cpu(btree->before);
1923 xfs_attr_trace_l_cb("descending",
1924 context, btree);
1925 break;
1926 }
1927 }
1928 if (i == be16_to_cpu(node->hdr.count)) {
1929 xfs_da_brelse(NULL, bp);
1930 return(0);
1931 }
1932 xfs_da_brelse(NULL, bp);
1933 }
1934 }
1935 ASSERT(bp != NULL);
1936
1937 /*
1938 * Roll upward through the blocks, processing each leaf block in
1939 * order. As long as there is space in the result buffer, keep
1940 * adding the information.
1941 */
1942 for (;;) {
1943 leaf = bp->data;
1944 if (unlikely(be16_to_cpu(leaf->hdr.info.magic)
1945 != XFS_ATTR_LEAF_MAGIC)) {
1946 XFS_CORRUPTION_ERROR("xfs_attr_node_list(4)",
1947 XFS_ERRLEVEL_LOW,
1948 context->dp->i_mount, leaf);
1949 xfs_da_brelse(NULL, bp);
1950 return(XFS_ERROR(EFSCORRUPTED));
1951 }
1952 error = xfs_attr_leaf_list_int(bp, context);
1953 if (error) {
1954 xfs_da_brelse(NULL, bp);
1955 return error;
1956 }
1957 if (context->seen_enough || leaf->hdr.info.forw == 0)
1958 break;
1959 cursor->blkno = be32_to_cpu(leaf->hdr.info.forw);
1960 xfs_da_brelse(NULL, bp);
1961 error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
1962 &bp, XFS_ATTR_FORK);
1963 if (error)
1964 return(error);
1965 if (unlikely((bp == NULL))) {
1966 XFS_ERROR_REPORT("xfs_attr_node_list(5)",
1967 XFS_ERRLEVEL_LOW,
1968 context->dp->i_mount);
1969 return(XFS_ERROR(EFSCORRUPTED));
1970 }
1971 }
1972 xfs_da_brelse(NULL, bp);
1973 return(0);
1974 }
1975
1976
1977 /*========================================================================
1978 * External routines for manipulating out-of-line attribute values.
1979 *========================================================================*/
1980
1981 /*
1982 * Read the value associated with an attribute from the out-of-line buffer
1983 * that we stored it in.
1984 */
1985 int
1986 xfs_attr_rmtval_get(xfs_da_args_t *args)
1987 {
1988 xfs_bmbt_irec_t map[ATTR_RMTVALUE_MAPSIZE];
1989 xfs_mount_t *mp;
1990 xfs_daddr_t dblkno;
1991 xfs_caddr_t dst;
1992 xfs_buf_t *bp;
1993 int nmap, error, tmp, valuelen, blkcnt, i;
1994 xfs_dablk_t lblkno;
1995
1996 ASSERT(!(args->flags & ATTR_KERNOVAL));
1997
1998 mp = args->dp->i_mount;
1999 dst = args->value;
2000 valuelen = args->valuelen;
2001 lblkno = args->rmtblkno;
2002 while (valuelen > 0) {
2003 nmap = ATTR_RMTVALUE_MAPSIZE;
2004 error = xfs_bmapi(args->trans, args->dp, (xfs_fileoff_t)lblkno,
2005 args->rmtblkcnt,
2006 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2007 NULL, 0, map, &nmap, NULL, NULL);
2008 if (error)
2009 return(error);
2010 ASSERT(nmap >= 1);
2011
2012 for (i = 0; (i < nmap) && (valuelen > 0); i++) {
2013 ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) &&
2014 (map[i].br_startblock != HOLESTARTBLOCK));
2015 dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock);
2016 blkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
2017 error = xfs_read_buf(mp, mp->m_ddev_targp, dblkno,
2018 blkcnt, XFS_BUF_LOCK, &bp);
2019 if (error)
2020 return(error);
2021
2022 tmp = (valuelen < XFS_BUF_SIZE(bp))
2023 ? valuelen : XFS_BUF_SIZE(bp);
2024 xfs_biomove(bp, 0, tmp, dst, XFS_B_READ);
2025 xfs_buf_relse(bp);
2026 dst += tmp;
2027 valuelen -= tmp;
2028
2029 lblkno += map[i].br_blockcount;
2030 }
2031 }
2032 ASSERT(valuelen == 0);
2033 return(0);
2034 }
2035
2036 /*
2037 * Write the value associated with an attribute into the out-of-line buffer
2038 * that we have defined for it.
2039 */
2040 STATIC int
2041 xfs_attr_rmtval_set(xfs_da_args_t *args)
2042 {
2043 xfs_mount_t *mp;
2044 xfs_fileoff_t lfileoff;
2045 xfs_inode_t *dp;
2046 xfs_bmbt_irec_t map;
2047 xfs_daddr_t dblkno;
2048 xfs_caddr_t src;
2049 xfs_buf_t *bp;
2050 xfs_dablk_t lblkno;
2051 int blkcnt, valuelen, nmap, error, tmp, committed;
2052
2053 dp = args->dp;
2054 mp = dp->i_mount;
2055 src = args->value;
2056
2057 /*
2058 * Find a "hole" in the attribute address space large enough for
2059 * us to drop the new attribute's value into.
2060 */
2061 blkcnt = XFS_B_TO_FSB(mp, args->valuelen);
2062 lfileoff = 0;
2063 error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff,
2064 XFS_ATTR_FORK);
2065 if (error) {
2066 return(error);
2067 }
2068 args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff;
2069 args->rmtblkcnt = blkcnt;
2070
2071 /*
2072 * Roll through the "value", allocating blocks on disk as required.
2073 */
2074 while (blkcnt > 0) {
2075 /*
2076 * Allocate a single extent, up to the size of the value.
2077 */
2078 XFS_BMAP_INIT(args->flist, args->firstblock);
2079 nmap = 1;
2080 error = xfs_bmapi(args->trans, dp, (xfs_fileoff_t)lblkno,
2081 blkcnt,
2082 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA |
2083 XFS_BMAPI_WRITE,
2084 args->firstblock, args->total, &map, &nmap,
2085 args->flist, NULL);
2086 if (!error) {
2087 error = xfs_bmap_finish(&args->trans, args->flist,
2088 &committed);
2089 }
2090 if (error) {
2091 ASSERT(committed);
2092 args->trans = NULL;
2093 xfs_bmap_cancel(args->flist);
2094 return(error);
2095 }
2096
2097 /*
2098 * bmap_finish() may have committed the last trans and started
2099 * a new one. We need the inode to be in all transactions.
2100 */
2101 if (committed) {
2102 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
2103 xfs_trans_ihold(args->trans, dp);
2104 }
2105
2106 ASSERT(nmap == 1);
2107 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2108 (map.br_startblock != HOLESTARTBLOCK));
2109 lblkno += map.br_blockcount;
2110 blkcnt -= map.br_blockcount;
2111
2112 /*
2113 * Start the next trans in the chain.
2114 */
2115 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
2116 return (error);
2117 }
2118
2119 /*
2120 * Roll through the "value", copying the attribute value to the
2121 * already-allocated blocks. Blocks are written synchronously
2122 * so that we can know they are all on disk before we turn off
2123 * the INCOMPLETE flag.
2124 */
2125 lblkno = args->rmtblkno;
2126 valuelen = args->valuelen;
2127 while (valuelen > 0) {
2128 /*
2129 * Try to remember where we decided to put the value.
2130 */
2131 XFS_BMAP_INIT(args->flist, args->firstblock);
2132 nmap = 1;
2133 error = xfs_bmapi(NULL, dp, (xfs_fileoff_t)lblkno,
2134 args->rmtblkcnt,
2135 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2136 args->firstblock, 0, &map, &nmap,
2137 NULL, NULL);
2138 if (error) {
2139 return(error);
2140 }
2141 ASSERT(nmap == 1);
2142 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2143 (map.br_startblock != HOLESTARTBLOCK));
2144
2145 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
2146 blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
2147
2148 bp = xfs_buf_get_flags(mp->m_ddev_targp, dblkno,
2149 blkcnt, XFS_BUF_LOCK);
2150 ASSERT(bp);
2151 ASSERT(!XFS_BUF_GETERROR(bp));
2152
2153 tmp = (valuelen < XFS_BUF_SIZE(bp)) ? valuelen :
2154 XFS_BUF_SIZE(bp);
2155 xfs_biomove(bp, 0, tmp, src, XFS_B_WRITE);
2156 if (tmp < XFS_BUF_SIZE(bp))
2157 xfs_biozero(bp, tmp, XFS_BUF_SIZE(bp) - tmp);
2158 if ((error = xfs_bwrite(mp, bp))) {/* GROT: NOTE: synchronous write */
2159 return (error);
2160 }
2161 src += tmp;
2162 valuelen -= tmp;
2163
2164 lblkno += map.br_blockcount;
2165 }
2166 ASSERT(valuelen == 0);
2167 return(0);
2168 }
2169
2170 /*
2171 * Remove the value associated with an attribute by deleting the
2172 * out-of-line buffer that it is stored on.
2173 */
2174 STATIC int
2175 xfs_attr_rmtval_remove(xfs_da_args_t *args)
2176 {
2177 xfs_mount_t *mp;
2178 xfs_bmbt_irec_t map;
2179 xfs_buf_t *bp;
2180 xfs_daddr_t dblkno;
2181 xfs_dablk_t lblkno;
2182 int valuelen, blkcnt, nmap, error, done, committed;
2183
2184 mp = args->dp->i_mount;
2185
2186 /*
2187 * Roll through the "value", invalidating the attribute value's
2188 * blocks.
2189 */
2190 lblkno = args->rmtblkno;
2191 valuelen = args->rmtblkcnt;
2192 while (valuelen > 0) {
2193 /*
2194 * Try to remember where we decided to put the value.
2195 */
2196 XFS_BMAP_INIT(args->flist, args->firstblock);
2197 nmap = 1;
2198 error = xfs_bmapi(NULL, args->dp, (xfs_fileoff_t)lblkno,
2199 args->rmtblkcnt,
2200 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2201 args->firstblock, 0, &map, &nmap,
2202 args->flist, NULL);
2203 if (error) {
2204 return(error);
2205 }
2206 ASSERT(nmap == 1);
2207 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2208 (map.br_startblock != HOLESTARTBLOCK));
2209
2210 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
2211 blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
2212
2213 /*
2214 * If the "remote" value is in the cache, remove it.
2215 */
2216 bp = xfs_incore(mp->m_ddev_targp, dblkno, blkcnt,
2217 XFS_INCORE_TRYLOCK);
2218 if (bp) {
2219 XFS_BUF_STALE(bp);
2220 XFS_BUF_UNDELAYWRITE(bp);
2221 xfs_buf_relse(bp);
2222 bp = NULL;
2223 }
2224
2225 valuelen -= map.br_blockcount;
2226
2227 lblkno += map.br_blockcount;
2228 }
2229
2230 /*
2231 * Keep de-allocating extents until the remote-value region is gone.
2232 */
2233 lblkno = args->rmtblkno;
2234 blkcnt = args->rmtblkcnt;
2235 done = 0;
2236 while (!done) {
2237 XFS_BMAP_INIT(args->flist, args->firstblock);
2238 error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt,
2239 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2240 1, args->firstblock, args->flist,
2241 NULL, &done);
2242 if (!error) {
2243 error = xfs_bmap_finish(&args->trans, args->flist,
2244 &committed);
2245 }
2246 if (error) {
2247 ASSERT(committed);
2248 args->trans = NULL;
2249 xfs_bmap_cancel(args->flist);
2250 return(error);
2251 }
2252
2253 /*
2254 * bmap_finish() may have committed the last trans and started
2255 * a new one. We need the inode to be in all transactions.
2256 */
2257 if (committed) {
2258 xfs_trans_ijoin(args->trans, args->dp, XFS_ILOCK_EXCL);
2259 xfs_trans_ihold(args->trans, args->dp);
2260 }
2261
2262 /*
2263 * Close out trans and start the next one in the chain.
2264 */
2265 if ((error = xfs_attr_rolltrans(&args->trans, args->dp)))
2266 return (error);
2267 }
2268 return(0);
2269 }
2270
2271 #if defined(XFS_ATTR_TRACE)
2272 /*
2273 * Add a trace buffer entry for an attr_list context structure.
2274 */
2275 void
2276 xfs_attr_trace_l_c(char *where, struct xfs_attr_list_context *context)
2277 {
2278 xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_C, where,
2279 (__psunsigned_t)context->dp,
2280 (__psunsigned_t)context->cursor->hashval,
2281 (__psunsigned_t)context->cursor->blkno,
2282 (__psunsigned_t)context->cursor->offset,
2283 (__psunsigned_t)context->alist,
2284 (__psunsigned_t)context->bufsize,
2285 (__psunsigned_t)context->count,
2286 (__psunsigned_t)context->firstu,
2287 (__psunsigned_t)
2288 ((context->count > 0) &&
2289 !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2290 ? (ATTR_ENTRY(context->alist,
2291 context->count-1)->a_valuelen)
2292 : 0,
2293 (__psunsigned_t)context->dupcnt,
2294 (__psunsigned_t)context->flags,
2295 (__psunsigned_t)NULL,
2296 (__psunsigned_t)NULL,
2297 (__psunsigned_t)NULL);
2298 }
2299
2300 /*
2301 * Add a trace buffer entry for a context structure and a Btree node.
2302 */
2303 void
2304 xfs_attr_trace_l_cn(char *where, struct xfs_attr_list_context *context,
2305 struct xfs_da_intnode *node)
2306 {
2307 xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CN, where,
2308 (__psunsigned_t)context->dp,
2309 (__psunsigned_t)context->cursor->hashval,
2310 (__psunsigned_t)context->cursor->blkno,
2311 (__psunsigned_t)context->cursor->offset,
2312 (__psunsigned_t)context->alist,
2313 (__psunsigned_t)context->bufsize,
2314 (__psunsigned_t)context->count,
2315 (__psunsigned_t)context->firstu,
2316 (__psunsigned_t)
2317 ((context->count > 0) &&
2318 !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2319 ? (ATTR_ENTRY(context->alist,
2320 context->count-1)->a_valuelen)
2321 : 0,
2322 (__psunsigned_t)context->dupcnt,
2323 (__psunsigned_t)context->flags,
2324 (__psunsigned_t)be16_to_cpu(node->hdr.count),
2325 (__psunsigned_t)be32_to_cpu(node->btree[0].hashval),
2326 (__psunsigned_t)be32_to_cpu(node->btree[
2327 be16_to_cpu(node->hdr.count)-1].hashval));
2328 }
2329
2330 /*
2331 * Add a trace buffer entry for a context structure and a Btree element.
2332 */
2333 void
2334 xfs_attr_trace_l_cb(char *where, struct xfs_attr_list_context *context,
2335 struct xfs_da_node_entry *btree)
2336 {
2337 xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CB, where,
2338 (__psunsigned_t)context->dp,
2339 (__psunsigned_t)context->cursor->hashval,
2340 (__psunsigned_t)context->cursor->blkno,
2341 (__psunsigned_t)context->cursor->offset,
2342 (__psunsigned_t)context->alist,
2343 (__psunsigned_t)context->bufsize,
2344 (__psunsigned_t)context->count,
2345 (__psunsigned_t)context->firstu,
2346 (__psunsigned_t)
2347 ((context->count > 0) &&
2348 !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2349 ? (ATTR_ENTRY(context->alist,
2350 context->count-1)->a_valuelen)
2351 : 0,
2352 (__psunsigned_t)context->dupcnt,
2353 (__psunsigned_t)context->flags,
2354 (__psunsigned_t)be32_to_cpu(btree->hashval),
2355 (__psunsigned_t)be32_to_cpu(btree->before),
2356 (__psunsigned_t)NULL);
2357 }
2358
2359 /*
2360 * Add a trace buffer entry for a context structure and a leaf block.
2361 */
2362 void
2363 xfs_attr_trace_l_cl(char *where, struct xfs_attr_list_context *context,
2364 struct xfs_attr_leafblock *leaf)
2365 {
2366 xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CL, where,
2367 (__psunsigned_t)context->dp,
2368 (__psunsigned_t)context->cursor->hashval,
2369 (__psunsigned_t)context->cursor->blkno,
2370 (__psunsigned_t)context->cursor->offset,
2371 (__psunsigned_t)context->alist,
2372 (__psunsigned_t)context->bufsize,
2373 (__psunsigned_t)context->count,
2374 (__psunsigned_t)context->firstu,
2375 (__psunsigned_t)
2376 ((context->count > 0) &&
2377 !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2378 ? (ATTR_ENTRY(context->alist,
2379 context->count-1)->a_valuelen)
2380 : 0,
2381 (__psunsigned_t)context->dupcnt,
2382 (__psunsigned_t)context->flags,
2383 (__psunsigned_t)be16_to_cpu(leaf->hdr.count),
2384 (__psunsigned_t)be32_to_cpu(leaf->entries[0].hashval),
2385 (__psunsigned_t)be32_to_cpu(leaf->entries[
2386 be16_to_cpu(leaf->hdr.count)-1].hashval));
2387 }
2388
2389 /*
2390 * Add a trace buffer entry for the arguments given to the routine,
2391 * generic form.
2392 */
2393 void
2394 xfs_attr_trace_enter(int type, char *where,
2395 __psunsigned_t a2, __psunsigned_t a3,
2396 __psunsigned_t a4, __psunsigned_t a5,
2397 __psunsigned_t a6, __psunsigned_t a7,
2398 __psunsigned_t a8, __psunsigned_t a9,
2399 __psunsigned_t a10, __psunsigned_t a11,
2400 __psunsigned_t a12, __psunsigned_t a13,
2401 __psunsigned_t a14, __psunsigned_t a15)
2402 {
2403 ASSERT(xfs_attr_trace_buf);
2404 ktrace_enter(xfs_attr_trace_buf, (void *)((__psunsigned_t)type),
2405 (void *)where,
2406 (void *)a2, (void *)a3, (void *)a4,
2407 (void *)a5, (void *)a6, (void *)a7,
2408 (void *)a8, (void *)a9, (void *)a10,
2409 (void *)a11, (void *)a12, (void *)a13,
2410 (void *)a14, (void *)a15);
2411 }
2412 #endif /* XFS_ATTR_TRACE */
2413
2414
2415 /*========================================================================
2416 * System (pseudo) namespace attribute interface routines.
2417 *========================================================================*/
2418
2419 STATIC int
2420 posix_acl_access_set(
2421 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2422 {
2423 return xfs_acl_vset(vp, data, size, _ACL_TYPE_ACCESS);
2424 }
2425
2426 STATIC int
2427 posix_acl_access_remove(
2428 bhv_vnode_t *vp, char *name, int xflags)
2429 {
2430 return xfs_acl_vremove(vp, _ACL_TYPE_ACCESS);
2431 }
2432
2433 STATIC int
2434 posix_acl_access_get(
2435 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2436 {
2437 return xfs_acl_vget(vp, data, size, _ACL_TYPE_ACCESS);
2438 }
2439
2440 STATIC int
2441 posix_acl_access_exists(
2442 bhv_vnode_t *vp)
2443 {
2444 return xfs_acl_vhasacl_access(vp);
2445 }
2446
2447 STATIC int
2448 posix_acl_default_set(
2449 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2450 {
2451 return xfs_acl_vset(vp, data, size, _ACL_TYPE_DEFAULT);
2452 }
2453
2454 STATIC int
2455 posix_acl_default_get(
2456 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2457 {
2458 return xfs_acl_vget(vp, data, size, _ACL_TYPE_DEFAULT);
2459 }
2460
2461 STATIC int
2462 posix_acl_default_remove(
2463 bhv_vnode_t *vp, char *name, int xflags)
2464 {
2465 return xfs_acl_vremove(vp, _ACL_TYPE_DEFAULT);
2466 }
2467
2468 STATIC int
2469 posix_acl_default_exists(
2470 bhv_vnode_t *vp)
2471 {
2472 return xfs_acl_vhasacl_default(vp);
2473 }
2474
2475 static struct attrnames posix_acl_access = {
2476 .attr_name = "posix_acl_access",
2477 .attr_namelen = sizeof("posix_acl_access") - 1,
2478 .attr_get = posix_acl_access_get,
2479 .attr_set = posix_acl_access_set,
2480 .attr_remove = posix_acl_access_remove,
2481 .attr_exists = posix_acl_access_exists,
2482 };
2483
2484 static struct attrnames posix_acl_default = {
2485 .attr_name = "posix_acl_default",
2486 .attr_namelen = sizeof("posix_acl_default") - 1,
2487 .attr_get = posix_acl_default_get,
2488 .attr_set = posix_acl_default_set,
2489 .attr_remove = posix_acl_default_remove,
2490 .attr_exists = posix_acl_default_exists,
2491 };
2492
2493 static struct attrnames *attr_system_names[] =
2494 { &posix_acl_access, &posix_acl_default };
2495
2496
2497 /*========================================================================
2498 * Namespace-prefix-style attribute name interface routines.
2499 *========================================================================*/
2500
2501 STATIC int
2502 attr_generic_set(
2503 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2504 {
2505 return -bhv_vop_attr_set(vp, name, data, size, xflags, NULL);
2506 }
2507
2508 STATIC int
2509 attr_generic_get(
2510 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2511 {
2512 int error, asize = size;
2513
2514 error = bhv_vop_attr_get(vp, name, data, &asize, xflags, NULL);
2515 if (!error)
2516 return asize;
2517 return -error;
2518 }
2519
2520 STATIC int
2521 attr_generic_remove(
2522 bhv_vnode_t *vp, char *name, int xflags)
2523 {
2524 return -bhv_vop_attr_remove(vp, name, xflags, NULL);
2525 }
2526
2527 STATIC int
2528 attr_generic_listadd(
2529 attrnames_t *prefix,
2530 attrnames_t *namesp,
2531 void *data,
2532 size_t size,
2533 ssize_t *result)
2534 {
2535 char *p = data + *result;
2536
2537 *result += prefix->attr_namelen;
2538 *result += namesp->attr_namelen + 1;
2539 if (!size)
2540 return 0;
2541 if (*result > size)
2542 return -ERANGE;
2543 strcpy(p, prefix->attr_name);
2544 p += prefix->attr_namelen;
2545 strcpy(p, namesp->attr_name);
2546 p += namesp->attr_namelen + 1;
2547 return 0;
2548 }
2549
2550 STATIC int
2551 attr_system_list(
2552 bhv_vnode_t *vp,
2553 void *data,
2554 size_t size,
2555 ssize_t *result)
2556 {
2557 attrnames_t *namesp;
2558 int i, error = 0;
2559
2560 for (i = 0; i < ATTR_SYSCOUNT; i++) {
2561 namesp = attr_system_names[i];
2562 if (!namesp->attr_exists || !namesp->attr_exists(vp))
2563 continue;
2564 error = attr_generic_listadd(&attr_system, namesp,
2565 data, size, result);
2566 if (error)
2567 break;
2568 }
2569 return error;
2570 }
2571
2572 int
2573 attr_generic_list(
2574 bhv_vnode_t *vp, void *data, size_t size, int xflags, ssize_t *result)
2575 {
2576 attrlist_cursor_kern_t cursor = { 0 };
2577 int error;
2578
2579 error = bhv_vop_attr_list(vp, data, size, xflags, &cursor, NULL);
2580 if (error > 0)
2581 return -error;
2582 *result = -error;
2583 return attr_system_list(vp, data, size, result);
2584 }
2585
2586 attrnames_t *
2587 attr_lookup_namespace(
2588 char *name,
2589 struct attrnames **names,
2590 int nnames)
2591 {
2592 int i;
2593
2594 for (i = 0; i < nnames; i++)
2595 if (!strncmp(name, names[i]->attr_name, names[i]->attr_namelen))
2596 return names[i];
2597 return NULL;
2598 }
2599
2600 /*
2601 * Some checks to prevent people abusing EAs to get over quota:
2602 * - Don't allow modifying user EAs on devices/symlinks;
2603 * - Don't allow modifying user EAs if sticky bit set;
2604 */
2605 STATIC int
2606 attr_user_capable(
2607 bhv_vnode_t *vp,
2608 cred_t *cred)
2609 {
2610 struct inode *inode = vn_to_inode(vp);
2611
2612 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
2613 return -EPERM;
2614 if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode) &&
2615 !capable(CAP_SYS_ADMIN))
2616 return -EPERM;
2617 if (S_ISDIR(inode->i_mode) && (inode->i_mode & S_ISVTX) &&
2618 (current_fsuid(cred) != inode->i_uid) && !capable(CAP_FOWNER))
2619 return -EPERM;
2620 return 0;
2621 }
2622
2623 STATIC int
2624 attr_trusted_capable(
2625 bhv_vnode_t *vp,
2626 cred_t *cred)
2627 {
2628 struct inode *inode = vn_to_inode(vp);
2629
2630 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
2631 return -EPERM;
2632 if (!capable(CAP_SYS_ADMIN))
2633 return -EPERM;
2634 return 0;
2635 }
2636
2637 STATIC int
2638 attr_secure_capable(
2639 bhv_vnode_t *vp,
2640 cred_t *cred)
2641 {
2642 return -ENOSECURITY;
2643 }
2644
2645 STATIC int
2646 attr_system_set(
2647 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2648 {
2649 attrnames_t *namesp;
2650 int error;
2651
2652 if (xflags & ATTR_CREATE)
2653 return -EINVAL;
2654
2655 namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT);
2656 if (!namesp)
2657 return -EOPNOTSUPP;
2658 error = namesp->attr_set(vp, name, data, size, xflags);
2659 if (!error)
2660 error = vn_revalidate(vp);
2661 return error;
2662 }
2663
2664 STATIC int
2665 attr_system_get(
2666 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2667 {
2668 attrnames_t *namesp;
2669
2670 namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT);
2671 if (!namesp)
2672 return -EOPNOTSUPP;
2673 return namesp->attr_get(vp, name, data, size, xflags);
2674 }
2675
2676 STATIC int
2677 attr_system_remove(
2678 bhv_vnode_t *vp, char *name, 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_remove(vp, name, xflags);
2686 }
2687
2688 struct attrnames attr_system = {
2689 .attr_name = "system.",
2690 .attr_namelen = sizeof("system.") - 1,
2691 .attr_flag = ATTR_SYSTEM,
2692 .attr_get = attr_system_get,
2693 .attr_set = attr_system_set,
2694 .attr_remove = attr_system_remove,
2695 .attr_capable = (attrcapable_t)fs_noerr,
2696 };
2697
2698 struct attrnames attr_trusted = {
2699 .attr_name = "trusted.",
2700 .attr_namelen = sizeof("trusted.") - 1,
2701 .attr_flag = ATTR_ROOT,
2702 .attr_get = attr_generic_get,
2703 .attr_set = attr_generic_set,
2704 .attr_remove = attr_generic_remove,
2705 .attr_capable = attr_trusted_capable,
2706 };
2707
2708 struct attrnames attr_secure = {
2709 .attr_name = "security.",
2710 .attr_namelen = sizeof("security.") - 1,
2711 .attr_flag = ATTR_SECURE,
2712 .attr_get = attr_generic_get,
2713 .attr_set = attr_generic_set,
2714 .attr_remove = attr_generic_remove,
2715 .attr_capable = attr_secure_capable,
2716 };
2717
2718 struct attrnames attr_user = {
2719 .attr_name = "user.",
2720 .attr_namelen = sizeof("user.") - 1,
2721 .attr_get = attr_generic_get,
2722 .attr_set = attr_generic_set,
2723 .attr_remove = attr_generic_remove,
2724 .attr_capable = attr_user_capable,
2725 };
2726
2727 struct attrnames *attr_namespaces[] =
2728 { &attr_system, &attr_trusted, &attr_secure, &attr_user };
Mirror for ia64_pv_ops.git