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[PATCH] fix silly ARM non-EABI build error
[linux-2.6/kvm.git] / fs / xfs / xfs_attr.c
blob1a210104327547b77768e6fd6cd58f7618bac090
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_get(xfs_da_args_t *args);
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(bhv_desc_t *bdp, const char *name, char *value, int *valuelenp,
161 int flags, struct cred *cred)
162 {
163 xfs_inode_t *ip = XFS_BHVTOI(bdp);
164 int error, namelen;
165
166 XFS_STATS_INC(xs_attr_get);
167
168 if (!name)
169 return(EINVAL);
170 namelen = strlen(name);
171 if (namelen >= MAXNAMELEN)
172 return(EFAULT); /* match IRIX behaviour */
173
174 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
175 return(EIO);
176
177 xfs_ilock(ip, XFS_ILOCK_SHARED);
178 error = xfs_attr_fetch(ip, name, namelen, value, valuelenp, flags, cred);
179 xfs_iunlock(ip, XFS_ILOCK_SHARED);
180 return(error);
181 }
182
183 STATIC int
184 xfs_attr_set_int(xfs_inode_t *dp, const char *name, int namelen,
185 char *value, int valuelen, int flags)
186 {
187 xfs_da_args_t args;
188 xfs_fsblock_t firstblock;
189 xfs_bmap_free_t flist;
190 int error, err2, committed;
191 int local, size;
192 uint nblks;
193 xfs_mount_t *mp = dp->i_mount;
194 int rsvd = (flags & ATTR_ROOT) != 0;
195
196 /*
197 * Attach the dquots to the inode.
198 */
199 if ((error = XFS_QM_DQATTACH(mp, dp, 0)))
200 return (error);
201
202 /*
203 * Determine space new attribute will use, and if it would be
204 * "local" or "remote" (note: local != inline).
205 */
206 size = xfs_attr_leaf_newentsize(namelen, valuelen,
207 mp->m_sb.sb_blocksize, &local);
208
209 /*
210 * If the inode doesn't have an attribute fork, add one.
211 * (inode must not be locked when we call this routine)
212 */
213 if (XFS_IFORK_Q(dp) == 0) {
214 if ((error = xfs_bmap_add_attrfork(dp, 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 nblks = XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK);
236 if (local) {
237 if (size > (mp->m_sb.sb_blocksize >> 1)) {
238 /* Double split possible */
239 nblks <<= 1;
240 }
241 } else {
242 uint dblocks = XFS_B_TO_FSB(mp, valuelen);
243 /* Out of line attribute, cannot double split, but make
244 * room for the attribute value itself.
245 */
246 nblks += dblocks;
247 nblks += XFS_NEXTENTADD_SPACE_RES(mp, dblocks, XFS_ATTR_FORK);
248 }
249
250 /* Size is now blocks for attribute data */
251 args.total = nblks;
252
253 /*
254 * Start our first transaction of the day.
255 *
256 * All future transactions during this code must be "chained" off
257 * this one via the trans_dup() call. All transactions will contain
258 * the inode, and the inode will always be marked with trans_ihold().
259 * Since the inode will be locked in all transactions, we must log
260 * the inode in every transaction to let it float upward through
261 * the log.
262 */
263 args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_SET);
264
265 /*
266 * Root fork attributes can use reserved data blocks for this
267 * operation if necessary
268 */
269
270 if (rsvd)
271 args.trans->t_flags |= XFS_TRANS_RESERVE;
272
273 if ((error = xfs_trans_reserve(args.trans, (uint) nblks,
274 XFS_ATTRSET_LOG_RES(mp, nblks),
275 0, XFS_TRANS_PERM_LOG_RES,
276 XFS_ATTRSET_LOG_COUNT))) {
277 xfs_trans_cancel(args.trans, 0);
278 return(error);
279 }
280 xfs_ilock(dp, XFS_ILOCK_EXCL);
281
282 error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, args.trans, dp, nblks, 0,
283 rsvd ? XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
284 XFS_QMOPT_RES_REGBLKS);
285 if (error) {
286 xfs_iunlock(dp, XFS_ILOCK_EXCL);
287 xfs_trans_cancel(args.trans, XFS_TRANS_RELEASE_LOG_RES);
288 return (error);
289 }
290
291 xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
292 xfs_trans_ihold(args.trans, dp);
293
294 /*
295 * If the attribute list is non-existent or a shortform list,
296 * upgrade it to a single-leaf-block attribute list.
297 */
298 if ((dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
299 ((dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS) &&
300 (dp->i_d.di_anextents == 0))) {
301
302 /*
303 * Build initial attribute list (if required).
304 */
305 if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS)
306 xfs_attr_shortform_create(&args);
307
308 /*
309 * Try to add the attr to the attribute list in
310 * the inode.
311 */
312 error = xfs_attr_shortform_addname(&args);
313 if (error != ENOSPC) {
314 /*
315 * Commit the shortform mods, and we're done.
316 * NOTE: this is also the error path (EEXIST, etc).
317 */
318 ASSERT(args.trans != NULL);
319
320 /*
321 * If this is a synchronous mount, make sure that
322 * the transaction goes to disk before returning
323 * to the user.
324 */
325 if (mp->m_flags & XFS_MOUNT_WSYNC) {
326 xfs_trans_set_sync(args.trans);
327 }
328 err2 = xfs_trans_commit(args.trans,
329 XFS_TRANS_RELEASE_LOG_RES,
330 NULL);
331 xfs_iunlock(dp, XFS_ILOCK_EXCL);
332
333 /*
334 * Hit the inode change time.
335 */
336 if (!error && (flags & ATTR_KERNOTIME) == 0) {
337 xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
338 }
339 return(error == 0 ? err2 : error);
340 }
341
342 /*
343 * It won't fit in the shortform, transform to a leaf block.
344 * GROT: another possible req'mt for a double-split btree op.
345 */
346 XFS_BMAP_INIT(args.flist, args.firstblock);
347 error = xfs_attr_shortform_to_leaf(&args);
348 if (!error) {
349 error = xfs_bmap_finish(&args.trans, args.flist,
350 *args.firstblock, &committed);
351 }
352 if (error) {
353 ASSERT(committed);
354 args.trans = NULL;
355 xfs_bmap_cancel(&flist);
356 goto out;
357 }
358
359 /*
360 * bmap_finish() may have committed the last trans and started
361 * a new one. We need the inode to be in all transactions.
362 */
363 if (committed) {
364 xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
365 xfs_trans_ihold(args.trans, dp);
366 }
367
368 /*
369 * Commit the leaf transformation. We'll need another (linked)
370 * transaction to add the new attribute to the leaf.
371 */
372 if ((error = xfs_attr_rolltrans(&args.trans, dp)))
373 goto out;
374
375 }
376
377 if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
378 error = xfs_attr_leaf_addname(&args);
379 } else {
380 error = xfs_attr_node_addname(&args);
381 }
382 if (error) {
383 goto out;
384 }
385
386 /*
387 * If this is a synchronous mount, make sure that the
388 * transaction goes to disk before returning to the user.
389 */
390 if (mp->m_flags & XFS_MOUNT_WSYNC) {
391 xfs_trans_set_sync(args.trans);
392 }
393
394 /*
395 * Commit the last in the sequence of transactions.
396 */
397 xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
398 error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES,
399 NULL);
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 STATIC 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 NULL);
547 xfs_iunlock(dp, XFS_ILOCK_EXCL);
548
549 /*
550 * Hit the inode change time.
551 */
552 if (!error && (flags & ATTR_KERNOTIME) == 0) {
553 xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
554 }
555
556 return(error);
557
558 out:
559 if (args.trans)
560 xfs_trans_cancel(args.trans,
561 XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
562 xfs_iunlock(dp, XFS_ILOCK_EXCL);
563 return(error);
564 }
565
566 int
567 xfs_attr_remove(bhv_desc_t *bdp, const char *name, int flags, struct cred *cred)
568 {
569 xfs_inode_t *dp;
570 int namelen;
571
572 namelen = strlen(name);
573 if (namelen >= MAXNAMELEN)
574 return EFAULT; /* match IRIX behaviour */
575
576 XFS_STATS_INC(xs_attr_remove);
577
578 dp = XFS_BHVTOI(bdp);
579 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
580 return (EIO);
581
582 xfs_ilock(dp, XFS_ILOCK_SHARED);
583 if (XFS_IFORK_Q(dp) == 0 ||
584 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
585 dp->i_d.di_anextents == 0)) {
586 xfs_iunlock(dp, XFS_ILOCK_SHARED);
587 return(XFS_ERROR(ENOATTR));
588 }
589 xfs_iunlock(dp, XFS_ILOCK_SHARED);
590
591 return xfs_attr_remove_int(dp, name, namelen, flags);
592 }
593
594 /*
595 * Generate a list of extended attribute names and optionally
596 * also value lengths. Positive return value follows the XFS
597 * convention of being an error, zero or negative return code
598 * is the length of the buffer returned (negated), indicating
599 * success.
600 */
601 int
602 xfs_attr_list(bhv_desc_t *bdp, char *buffer, int bufsize, int flags,
603 attrlist_cursor_kern_t *cursor, struct cred *cred)
604 {
605 xfs_attr_list_context_t context;
606 xfs_inode_t *dp;
607 int error;
608
609 XFS_STATS_INC(xs_attr_list);
610
611 /*
612 * Validate the cursor.
613 */
614 if (cursor->pad1 || cursor->pad2)
615 return(XFS_ERROR(EINVAL));
616 if ((cursor->initted == 0) &&
617 (cursor->hashval || cursor->blkno || cursor->offset))
618 return(XFS_ERROR(EINVAL));
619
620 /*
621 * Check for a properly aligned buffer.
622 */
623 if (((long)buffer) & (sizeof(int)-1))
624 return(XFS_ERROR(EFAULT));
625 if (flags & ATTR_KERNOVAL)
626 bufsize = 0;
627
628 /*
629 * Initialize the output buffer.
630 */
631 context.dp = dp = XFS_BHVTOI(bdp);
632 context.cursor = cursor;
633 context.count = 0;
634 context.dupcnt = 0;
635 context.resynch = 1;
636 context.flags = flags;
637 if (!(flags & ATTR_KERNAMELS)) {
638 context.bufsize = (bufsize & ~(sizeof(int)-1)); /* align */
639 context.firstu = context.bufsize;
640 context.alist = (attrlist_t *)buffer;
641 context.alist->al_count = 0;
642 context.alist->al_more = 0;
643 context.alist->al_offset[0] = context.bufsize;
644 }
645 else {
646 context.bufsize = bufsize;
647 context.firstu = context.bufsize;
648 context.alist = (attrlist_t *)buffer;
649 }
650
651 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
652 return (EIO);
653
654 xfs_ilock(dp, XFS_ILOCK_SHARED);
655 /*
656 * Decide on what work routines to call based on the inode size.
657 */
658 xfs_attr_trace_l_c("syscall start", &context);
659 if (XFS_IFORK_Q(dp) == 0 ||
660 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
661 dp->i_d.di_anextents == 0)) {
662 error = 0;
663 } else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
664 error = xfs_attr_shortform_list(&context);
665 } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
666 error = xfs_attr_leaf_list(&context);
667 } else {
668 error = xfs_attr_node_list(&context);
669 }
670 xfs_iunlock(dp, XFS_ILOCK_SHARED);
671 xfs_attr_trace_l_c("syscall end", &context);
672
673 if (!(context.flags & (ATTR_KERNOVAL|ATTR_KERNAMELS))) {
674 ASSERT(error >= 0);
675 }
676 else { /* must return negated buffer size or the error */
677 if (context.count < 0)
678 error = XFS_ERROR(ERANGE);
679 else
680 error = -context.count;
681 }
682
683 return(error);
684 }
685
686 int /* error */
687 xfs_attr_inactive(xfs_inode_t *dp)
688 {
689 xfs_trans_t *trans;
690 xfs_mount_t *mp;
691 int error;
692
693 mp = dp->i_mount;
694 ASSERT(! XFS_NOT_DQATTACHED(mp, dp));
695
696 xfs_ilock(dp, XFS_ILOCK_SHARED);
697 if ((XFS_IFORK_Q(dp) == 0) ||
698 (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
699 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
700 dp->i_d.di_anextents == 0)) {
701 xfs_iunlock(dp, XFS_ILOCK_SHARED);
702 return(0);
703 }
704 xfs_iunlock(dp, XFS_ILOCK_SHARED);
705
706 /*
707 * Start our first transaction of the day.
708 *
709 * All future transactions during this code must be "chained" off
710 * this one via the trans_dup() call. All transactions will contain
711 * the inode, and the inode will always be marked with trans_ihold().
712 * Since the inode will be locked in all transactions, we must log
713 * the inode in every transaction to let it float upward through
714 * the log.
715 */
716 trans = xfs_trans_alloc(mp, XFS_TRANS_ATTRINVAL);
717 if ((error = xfs_trans_reserve(trans, 0, XFS_ATTRINVAL_LOG_RES(mp), 0,
718 XFS_TRANS_PERM_LOG_RES,
719 XFS_ATTRINVAL_LOG_COUNT))) {
720 xfs_trans_cancel(trans, 0);
721 return(error);
722 }
723 xfs_ilock(dp, XFS_ILOCK_EXCL);
724
725 /*
726 * No need to make quota reservations here. We expect to release some
727 * blocks, not allocate, in the common case.
728 */
729 xfs_trans_ijoin(trans, dp, XFS_ILOCK_EXCL);
730 xfs_trans_ihold(trans, dp);
731
732 /*
733 * Decide on what work routines to call based on the inode size.
734 */
735 if ((XFS_IFORK_Q(dp) == 0) ||
736 (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
737 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
738 dp->i_d.di_anextents == 0)) {
739 error = 0;
740 goto out;
741 }
742 error = xfs_attr_root_inactive(&trans, dp);
743 if (error)
744 goto out;
745 /*
746 * signal synchronous inactive transactions unless this
747 * is a synchronous mount filesystem in which case we
748 * know that we're here because we've been called out of
749 * xfs_inactive which means that the last reference is gone
750 * and the unlink transaction has already hit the disk so
751 * async inactive transactions are safe.
752 */
753 if ((error = xfs_itruncate_finish(&trans, dp, 0LL, XFS_ATTR_FORK,
754 (!(mp->m_flags & XFS_MOUNT_WSYNC)
755 ? 1 : 0))))
756 goto out;
757
758 /*
759 * Commit the last in the sequence of transactions.
760 */
761 xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
762 error = xfs_trans_commit(trans, XFS_TRANS_RELEASE_LOG_RES,
763 NULL);
764 xfs_iunlock(dp, XFS_ILOCK_EXCL);
765
766 return(error);
767
768 out:
769 xfs_trans_cancel(trans, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
770 xfs_iunlock(dp, XFS_ILOCK_EXCL);
771 return(error);
772 }
773
774
775
776 /*========================================================================
777 * External routines when attribute list is inside the inode
778 *========================================================================*/
779
780 /*
781 * Add a name to the shortform attribute list structure
782 * This is the external routine.
783 */
784 STATIC int
785 xfs_attr_shortform_addname(xfs_da_args_t *args)
786 {
787 int newsize, forkoff, retval;
788
789 retval = xfs_attr_shortform_lookup(args);
790 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
791 return(retval);
792 } else if (retval == EEXIST) {
793 if (args->flags & ATTR_CREATE)
794 return(retval);
795 retval = xfs_attr_shortform_remove(args);
796 ASSERT(retval == 0);
797 }
798
799 if (args->namelen >= XFS_ATTR_SF_ENTSIZE_MAX ||
800 args->valuelen >= XFS_ATTR_SF_ENTSIZE_MAX)
801 return(XFS_ERROR(ENOSPC));
802
803 newsize = XFS_ATTR_SF_TOTSIZE(args->dp);
804 newsize += XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
805
806 forkoff = xfs_attr_shortform_bytesfit(args->dp, newsize);
807 if (!forkoff)
808 return(XFS_ERROR(ENOSPC));
809
810 xfs_attr_shortform_add(args, forkoff);
811 return(0);
812 }
813
814
815 /*========================================================================
816 * External routines when attribute list is one block
817 *========================================================================*/
818
819 /*
820 * Add a name to the leaf attribute list structure
821 *
822 * This leaf block cannot have a "remote" value, we only call this routine
823 * if bmap_one_block() says there is only one block (ie: no remote blks).
824 */
825 int
826 xfs_attr_leaf_addname(xfs_da_args_t *args)
827 {
828 xfs_inode_t *dp;
829 xfs_dabuf_t *bp;
830 int retval, error, committed, forkoff;
831
832 /*
833 * Read the (only) block in the attribute list in.
834 */
835 dp = args->dp;
836 args->blkno = 0;
837 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
838 XFS_ATTR_FORK);
839 if (error)
840 return(error);
841 ASSERT(bp != NULL);
842
843 /*
844 * Look up the given attribute in the leaf block. Figure out if
845 * the given flags produce an error or call for an atomic rename.
846 */
847 retval = xfs_attr_leaf_lookup_int(bp, args);
848 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
849 xfs_da_brelse(args->trans, bp);
850 return(retval);
851 } else if (retval == EEXIST) {
852 if (args->flags & ATTR_CREATE) { /* pure create op */
853 xfs_da_brelse(args->trans, bp);
854 return(retval);
855 }
856 args->rename = 1; /* an atomic rename */
857 args->blkno2 = args->blkno; /* set 2nd entry info*/
858 args->index2 = args->index;
859 args->rmtblkno2 = args->rmtblkno;
860 args->rmtblkcnt2 = args->rmtblkcnt;
861 }
862
863 /*
864 * Add the attribute to the leaf block, transitioning to a Btree
865 * if required.
866 */
867 retval = xfs_attr_leaf_add(bp, args);
868 xfs_da_buf_done(bp);
869 if (retval == ENOSPC) {
870 /*
871 * Promote the attribute list to the Btree format, then
872 * Commit that transaction so that the node_addname() call
873 * can manage its own transactions.
874 */
875 XFS_BMAP_INIT(args->flist, args->firstblock);
876 error = xfs_attr_leaf_to_node(args);
877 if (!error) {
878 error = xfs_bmap_finish(&args->trans, args->flist,
879 *args->firstblock, &committed);
880 }
881 if (error) {
882 ASSERT(committed);
883 args->trans = NULL;
884 xfs_bmap_cancel(args->flist);
885 return(error);
886 }
887
888 /*
889 * bmap_finish() may have committed the last trans and started
890 * a new one. We need the inode to be in all transactions.
891 */
892 if (committed) {
893 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
894 xfs_trans_ihold(args->trans, dp);
895 }
896
897 /*
898 * Commit the current trans (including the inode) and start
899 * a new one.
900 */
901 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
902 return (error);
903
904 /*
905 * Fob the whole rest of the problem off on the Btree code.
906 */
907 error = xfs_attr_node_addname(args);
908 return(error);
909 }
910
911 /*
912 * Commit the transaction that added the attr name so that
913 * later routines can manage their own transactions.
914 */
915 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
916 return (error);
917
918 /*
919 * If there was an out-of-line value, allocate the blocks we
920 * identified for its storage and copy the value. This is done
921 * after we create the attribute so that we don't overflow the
922 * maximum size of a transaction and/or hit a deadlock.
923 */
924 if (args->rmtblkno > 0) {
925 error = xfs_attr_rmtval_set(args);
926 if (error)
927 return(error);
928 }
929
930 /*
931 * If this is an atomic rename operation, we must "flip" the
932 * incomplete flags on the "new" and "old" attribute/value pairs
933 * so that one disappears and one appears atomically. Then we
934 * must remove the "old" attribute/value pair.
935 */
936 if (args->rename) {
937 /*
938 * In a separate transaction, set the incomplete flag on the
939 * "old" attr and clear the incomplete flag on the "new" attr.
940 */
941 error = xfs_attr_leaf_flipflags(args);
942 if (error)
943 return(error);
944
945 /*
946 * Dismantle the "old" attribute/value pair by removing
947 * a "remote" value (if it exists).
948 */
949 args->index = args->index2;
950 args->blkno = args->blkno2;
951 args->rmtblkno = args->rmtblkno2;
952 args->rmtblkcnt = args->rmtblkcnt2;
953 if (args->rmtblkno) {
954 error = xfs_attr_rmtval_remove(args);
955 if (error)
956 return(error);
957 }
958
959 /*
960 * Read in the block containing the "old" attr, then
961 * remove the "old" attr from that block (neat, huh!)
962 */
963 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1,
964 &bp, XFS_ATTR_FORK);
965 if (error)
966 return(error);
967 ASSERT(bp != NULL);
968 (void)xfs_attr_leaf_remove(bp, args);
969
970 /*
971 * If the result is small enough, shrink it all into the inode.
972 */
973 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
974 XFS_BMAP_INIT(args->flist, args->firstblock);
975 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
976 /* bp is gone due to xfs_da_shrink_inode */
977 if (!error) {
978 error = xfs_bmap_finish(&args->trans,
979 args->flist,
980 *args->firstblock,
981 &committed);
982 }
983 if (error) {
984 ASSERT(committed);
985 args->trans = NULL;
986 xfs_bmap_cancel(args->flist);
987 return(error);
988 }
989
990 /*
991 * bmap_finish() may have committed the last trans
992 * and started a new one. We need the inode to be
993 * in all transactions.
994 */
995 if (committed) {
996 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
997 xfs_trans_ihold(args->trans, dp);
998 }
999 } else
1000 xfs_da_buf_done(bp);
1001
1002 /*
1003 * Commit the remove and start the next trans in series.
1004 */
1005 error = xfs_attr_rolltrans(&args->trans, dp);
1006
1007 } else if (args->rmtblkno > 0) {
1008 /*
1009 * Added a "remote" value, just clear the incomplete flag.
1010 */
1011 error = xfs_attr_leaf_clearflag(args);
1012 }
1013 return(error);
1014 }
1015
1016 /*
1017 * Remove a name from the leaf attribute list structure
1018 *
1019 * This leaf block cannot have a "remote" value, we only call this routine
1020 * if bmap_one_block() says there is only one block (ie: no remote blks).
1021 */
1022 STATIC int
1023 xfs_attr_leaf_removename(xfs_da_args_t *args)
1024 {
1025 xfs_inode_t *dp;
1026 xfs_dabuf_t *bp;
1027 int error, committed, forkoff;
1028
1029 /*
1030 * Remove the attribute.
1031 */
1032 dp = args->dp;
1033 args->blkno = 0;
1034 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
1035 XFS_ATTR_FORK);
1036 if (error) {
1037 return(error);
1038 }
1039
1040 ASSERT(bp != NULL);
1041 error = xfs_attr_leaf_lookup_int(bp, args);
1042 if (error == ENOATTR) {
1043 xfs_da_brelse(args->trans, bp);
1044 return(error);
1045 }
1046
1047 (void)xfs_attr_leaf_remove(bp, args);
1048
1049 /*
1050 * If the result is small enough, shrink it all into the inode.
1051 */
1052 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1053 XFS_BMAP_INIT(args->flist, args->firstblock);
1054 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1055 /* bp is gone due to xfs_da_shrink_inode */
1056 if (!error) {
1057 error = xfs_bmap_finish(&args->trans, args->flist,
1058 *args->firstblock, &committed);
1059 }
1060 if (error) {
1061 ASSERT(committed);
1062 args->trans = NULL;
1063 xfs_bmap_cancel(args->flist);
1064 return(error);
1065 }
1066
1067 /*
1068 * bmap_finish() may have committed the last trans and started
1069 * a new one. We need the inode to be in all transactions.
1070 */
1071 if (committed) {
1072 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1073 xfs_trans_ihold(args->trans, dp);
1074 }
1075 } else
1076 xfs_da_buf_done(bp);
1077 return(0);
1078 }
1079
1080 /*
1081 * Look up a name in a leaf attribute list structure.
1082 *
1083 * This leaf block cannot have a "remote" value, we only call this routine
1084 * if bmap_one_block() says there is only one block (ie: no remote blks).
1085 */
1086 STATIC int
1087 xfs_attr_leaf_get(xfs_da_args_t *args)
1088 {
1089 xfs_dabuf_t *bp;
1090 int error;
1091
1092 args->blkno = 0;
1093 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
1094 XFS_ATTR_FORK);
1095 if (error)
1096 return(error);
1097 ASSERT(bp != NULL);
1098
1099 error = xfs_attr_leaf_lookup_int(bp, args);
1100 if (error != EEXIST) {
1101 xfs_da_brelse(args->trans, bp);
1102 return(error);
1103 }
1104 error = xfs_attr_leaf_getvalue(bp, args);
1105 xfs_da_brelse(args->trans, bp);
1106 if (!error && (args->rmtblkno > 0) && !(args->flags & ATTR_KERNOVAL)) {
1107 error = xfs_attr_rmtval_get(args);
1108 }
1109 return(error);
1110 }
1111
1112 /*
1113 * Copy out attribute entries for attr_list(), for leaf attribute lists.
1114 */
1115 STATIC int
1116 xfs_attr_leaf_list(xfs_attr_list_context_t *context)
1117 {
1118 xfs_attr_leafblock_t *leaf;
1119 int error;
1120 xfs_dabuf_t *bp;
1121
1122 context->cursor->blkno = 0;
1123 error = xfs_da_read_buf(NULL, context->dp, 0, -1, &bp, XFS_ATTR_FORK);
1124 if (error)
1125 return(error);
1126 ASSERT(bp != NULL);
1127 leaf = bp->data;
1128 if (unlikely(be16_to_cpu(leaf->hdr.info.magic) != XFS_ATTR_LEAF_MAGIC)) {
1129 XFS_CORRUPTION_ERROR("xfs_attr_leaf_list", XFS_ERRLEVEL_LOW,
1130 context->dp->i_mount, leaf);
1131 xfs_da_brelse(NULL, bp);
1132 return(XFS_ERROR(EFSCORRUPTED));
1133 }
1134
1135 (void)xfs_attr_leaf_list_int(bp, context);
1136 xfs_da_brelse(NULL, bp);
1137 return(0);
1138 }
1139
1140
1141 /*========================================================================
1142 * External routines when attribute list size > XFS_LBSIZE(mp).
1143 *========================================================================*/
1144
1145 /*
1146 * Add a name to a Btree-format attribute list.
1147 *
1148 * This will involve walking down the Btree, and may involve splitting
1149 * leaf nodes and even splitting intermediate nodes up to and including
1150 * the root node (a special case of an intermediate node).
1151 *
1152 * "Remote" attribute values confuse the issue and atomic rename operations
1153 * add a whole extra layer of confusion on top of that.
1154 */
1155 STATIC int
1156 xfs_attr_node_addname(xfs_da_args_t *args)
1157 {
1158 xfs_da_state_t *state;
1159 xfs_da_state_blk_t *blk;
1160 xfs_inode_t *dp;
1161 xfs_mount_t *mp;
1162 int committed, retval, error;
1163
1164 /*
1165 * Fill in bucket of arguments/results/context to carry around.
1166 */
1167 dp = args->dp;
1168 mp = dp->i_mount;
1169 restart:
1170 state = xfs_da_state_alloc();
1171 state->args = args;
1172 state->mp = mp;
1173 state->blocksize = state->mp->m_sb.sb_blocksize;
1174 state->node_ents = state->mp->m_attr_node_ents;
1175
1176 /*
1177 * Search to see if name already exists, and get back a pointer
1178 * to where it should go.
1179 */
1180 error = xfs_da_node_lookup_int(state, &retval);
1181 if (error)
1182 goto out;
1183 blk = &state->path.blk[ state->path.active-1 ];
1184 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1185 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
1186 goto out;
1187 } else if (retval == EEXIST) {
1188 if (args->flags & ATTR_CREATE)
1189 goto out;
1190 args->rename = 1; /* atomic rename op */
1191 args->blkno2 = args->blkno; /* set 2nd entry info*/
1192 args->index2 = args->index;
1193 args->rmtblkno2 = args->rmtblkno;
1194 args->rmtblkcnt2 = args->rmtblkcnt;
1195 args->rmtblkno = 0;
1196 args->rmtblkcnt = 0;
1197 }
1198
1199 retval = xfs_attr_leaf_add(blk->bp, state->args);
1200 if (retval == ENOSPC) {
1201 if (state->path.active == 1) {
1202 /*
1203 * Its really a single leaf node, but it had
1204 * out-of-line values so it looked like it *might*
1205 * have been a b-tree.
1206 */
1207 xfs_da_state_free(state);
1208 XFS_BMAP_INIT(args->flist, args->firstblock);
1209 error = xfs_attr_leaf_to_node(args);
1210 if (!error) {
1211 error = xfs_bmap_finish(&args->trans,
1212 args->flist,
1213 *args->firstblock,
1214 &committed);
1215 }
1216 if (error) {
1217 ASSERT(committed);
1218 args->trans = NULL;
1219 xfs_bmap_cancel(args->flist);
1220 goto out;
1221 }
1222
1223 /*
1224 * bmap_finish() may have committed the last trans
1225 * and started a new one. We need the inode to be
1226 * in all transactions.
1227 */
1228 if (committed) {
1229 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1230 xfs_trans_ihold(args->trans, dp);
1231 }
1232
1233 /*
1234 * Commit the node conversion and start the next
1235 * trans in the chain.
1236 */
1237 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1238 goto out;
1239
1240 goto restart;
1241 }
1242
1243 /*
1244 * Split as many Btree elements as required.
1245 * This code tracks the new and old attr's location
1246 * in the index/blkno/rmtblkno/rmtblkcnt fields and
1247 * in the index2/blkno2/rmtblkno2/rmtblkcnt2 fields.
1248 */
1249 XFS_BMAP_INIT(args->flist, args->firstblock);
1250 error = xfs_da_split(state);
1251 if (!error) {
1252 error = xfs_bmap_finish(&args->trans, args->flist,
1253 *args->firstblock, &committed);
1254 }
1255 if (error) {
1256 ASSERT(committed);
1257 args->trans = NULL;
1258 xfs_bmap_cancel(args->flist);
1259 goto out;
1260 }
1261
1262 /*
1263 * bmap_finish() may have committed the last trans and started
1264 * a new one. We need the inode to be in all transactions.
1265 */
1266 if (committed) {
1267 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1268 xfs_trans_ihold(args->trans, dp);
1269 }
1270 } else {
1271 /*
1272 * Addition succeeded, update Btree hashvals.
1273 */
1274 xfs_da_fixhashpath(state, &state->path);
1275 }
1276
1277 /*
1278 * Kill the state structure, we're done with it and need to
1279 * allow the buffers to come back later.
1280 */
1281 xfs_da_state_free(state);
1282 state = NULL;
1283
1284 /*
1285 * Commit the leaf addition or btree split and start the next
1286 * trans in the chain.
1287 */
1288 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1289 goto out;
1290
1291 /*
1292 * If there was an out-of-line value, allocate the blocks we
1293 * identified for its storage and copy the value. This is done
1294 * after we create the attribute so that we don't overflow the
1295 * maximum size of a transaction and/or hit a deadlock.
1296 */
1297 if (args->rmtblkno > 0) {
1298 error = xfs_attr_rmtval_set(args);
1299 if (error)
1300 return(error);
1301 }
1302
1303 /*
1304 * If this is an atomic rename operation, we must "flip" the
1305 * incomplete flags on the "new" and "old" attribute/value pairs
1306 * so that one disappears and one appears atomically. Then we
1307 * must remove the "old" attribute/value pair.
1308 */
1309 if (args->rename) {
1310 /*
1311 * In a separate transaction, set the incomplete flag on the
1312 * "old" attr and clear the incomplete flag on the "new" attr.
1313 */
1314 error = xfs_attr_leaf_flipflags(args);
1315 if (error)
1316 goto out;
1317
1318 /*
1319 * Dismantle the "old" attribute/value pair by removing
1320 * a "remote" value (if it exists).
1321 */
1322 args->index = args->index2;
1323 args->blkno = args->blkno2;
1324 args->rmtblkno = args->rmtblkno2;
1325 args->rmtblkcnt = args->rmtblkcnt2;
1326 if (args->rmtblkno) {
1327 error = xfs_attr_rmtval_remove(args);
1328 if (error)
1329 return(error);
1330 }
1331
1332 /*
1333 * Re-find the "old" attribute entry after any split ops.
1334 * The INCOMPLETE flag means that we will find the "old"
1335 * attr, not the "new" one.
1336 */
1337 args->flags |= XFS_ATTR_INCOMPLETE;
1338 state = xfs_da_state_alloc();
1339 state->args = args;
1340 state->mp = mp;
1341 state->blocksize = state->mp->m_sb.sb_blocksize;
1342 state->node_ents = state->mp->m_attr_node_ents;
1343 state->inleaf = 0;
1344 error = xfs_da_node_lookup_int(state, &retval);
1345 if (error)
1346 goto out;
1347
1348 /*
1349 * Remove the name and update the hashvals in the tree.
1350 */
1351 blk = &state->path.blk[ state->path.active-1 ];
1352 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1353 error = xfs_attr_leaf_remove(blk->bp, args);
1354 xfs_da_fixhashpath(state, &state->path);
1355
1356 /*
1357 * Check to see if the tree needs to be collapsed.
1358 */
1359 if (retval && (state->path.active > 1)) {
1360 XFS_BMAP_INIT(args->flist, args->firstblock);
1361 error = xfs_da_join(state);
1362 if (!error) {
1363 error = xfs_bmap_finish(&args->trans,
1364 args->flist,
1365 *args->firstblock,
1366 &committed);
1367 }
1368 if (error) {
1369 ASSERT(committed);
1370 args->trans = NULL;
1371 xfs_bmap_cancel(args->flist);
1372 goto out;
1373 }
1374
1375 /*
1376 * bmap_finish() may have committed the last trans
1377 * and started a new one. We need the inode to be
1378 * in all transactions.
1379 */
1380 if (committed) {
1381 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1382 xfs_trans_ihold(args->trans, dp);
1383 }
1384 }
1385
1386 /*
1387 * Commit and start the next trans in the chain.
1388 */
1389 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1390 goto out;
1391
1392 } else if (args->rmtblkno > 0) {
1393 /*
1394 * Added a "remote" value, just clear the incomplete flag.
1395 */
1396 error = xfs_attr_leaf_clearflag(args);
1397 if (error)
1398 goto out;
1399 }
1400 retval = error = 0;
1401
1402 out:
1403 if (state)
1404 xfs_da_state_free(state);
1405 if (error)
1406 return(error);
1407 return(retval);
1408 }
1409
1410 /*
1411 * Remove a name from a B-tree attribute list.
1412 *
1413 * This will involve walking down the Btree, and may involve joining
1414 * leaf nodes and even joining intermediate nodes up to and including
1415 * the root node (a special case of an intermediate node).
1416 */
1417 STATIC int
1418 xfs_attr_node_removename(xfs_da_args_t *args)
1419 {
1420 xfs_da_state_t *state;
1421 xfs_da_state_blk_t *blk;
1422 xfs_inode_t *dp;
1423 xfs_dabuf_t *bp;
1424 int retval, error, committed, forkoff;
1425
1426 /*
1427 * Tie a string around our finger to remind us where we are.
1428 */
1429 dp = args->dp;
1430 state = xfs_da_state_alloc();
1431 state->args = args;
1432 state->mp = dp->i_mount;
1433 state->blocksize = state->mp->m_sb.sb_blocksize;
1434 state->node_ents = state->mp->m_attr_node_ents;
1435
1436 /*
1437 * Search to see if name exists, and get back a pointer to it.
1438 */
1439 error = xfs_da_node_lookup_int(state, &retval);
1440 if (error || (retval != EEXIST)) {
1441 if (error == 0)
1442 error = retval;
1443 goto out;
1444 }
1445
1446 /*
1447 * If there is an out-of-line value, de-allocate the blocks.
1448 * This is done before we remove the attribute so that we don't
1449 * overflow the maximum size of a transaction and/or hit a deadlock.
1450 */
1451 blk = &state->path.blk[ state->path.active-1 ];
1452 ASSERT(blk->bp != NULL);
1453 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1454 if (args->rmtblkno > 0) {
1455 /*
1456 * Fill in disk block numbers in the state structure
1457 * so that we can get the buffers back after we commit
1458 * several transactions in the following calls.
1459 */
1460 error = xfs_attr_fillstate(state);
1461 if (error)
1462 goto out;
1463
1464 /*
1465 * Mark the attribute as INCOMPLETE, then bunmapi() the
1466 * remote value.
1467 */
1468 error = xfs_attr_leaf_setflag(args);
1469 if (error)
1470 goto out;
1471 error = xfs_attr_rmtval_remove(args);
1472 if (error)
1473 goto out;
1474
1475 /*
1476 * Refill the state structure with buffers, the prior calls
1477 * released our buffers.
1478 */
1479 error = xfs_attr_refillstate(state);
1480 if (error)
1481 goto out;
1482 }
1483
1484 /*
1485 * Remove the name and update the hashvals in the tree.
1486 */
1487 blk = &state->path.blk[ state->path.active-1 ];
1488 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1489 retval = xfs_attr_leaf_remove(blk->bp, args);
1490 xfs_da_fixhashpath(state, &state->path);
1491
1492 /*
1493 * Check to see if the tree needs to be collapsed.
1494 */
1495 if (retval && (state->path.active > 1)) {
1496 XFS_BMAP_INIT(args->flist, args->firstblock);
1497 error = xfs_da_join(state);
1498 if (!error) {
1499 error = xfs_bmap_finish(&args->trans, args->flist,
1500 *args->firstblock, &committed);
1501 }
1502 if (error) {
1503 ASSERT(committed);
1504 args->trans = NULL;
1505 xfs_bmap_cancel(args->flist);
1506 goto out;
1507 }
1508
1509 /*
1510 * bmap_finish() may have committed the last trans and started
1511 * a new one. We need the inode to be in all transactions.
1512 */
1513 if (committed) {
1514 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1515 xfs_trans_ihold(args->trans, dp);
1516 }
1517
1518 /*
1519 * Commit the Btree join operation and start a new trans.
1520 */
1521 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1522 goto out;
1523 }
1524
1525 /*
1526 * If the result is small enough, push it all into the inode.
1527 */
1528 if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
1529 /*
1530 * Have to get rid of the copy of this dabuf in the state.
1531 */
1532 ASSERT(state->path.active == 1);
1533 ASSERT(state->path.blk[0].bp);
1534 xfs_da_buf_done(state->path.blk[0].bp);
1535 state->path.blk[0].bp = NULL;
1536
1537 error = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp,
1538 XFS_ATTR_FORK);
1539 if (error)
1540 goto out;
1541 ASSERT(be16_to_cpu(((xfs_attr_leafblock_t *)
1542 bp->data)->hdr.info.magic)
1543 == XFS_ATTR_LEAF_MAGIC);
1544
1545 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1546 XFS_BMAP_INIT(args->flist, args->firstblock);
1547 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1548 /* bp is gone due to xfs_da_shrink_inode */
1549 if (!error) {
1550 error = xfs_bmap_finish(&args->trans,
1551 args->flist,
1552 *args->firstblock,
1553 &committed);
1554 }
1555 if (error) {
1556 ASSERT(committed);
1557 args->trans = NULL;
1558 xfs_bmap_cancel(args->flist);
1559 goto out;
1560 }
1561
1562 /*
1563 * bmap_finish() may have committed the last trans
1564 * and started a new one. We need the inode to be
1565 * in all transactions.
1566 */
1567 if (committed) {
1568 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1569 xfs_trans_ihold(args->trans, dp);
1570 }
1571 } else
1572 xfs_da_brelse(args->trans, bp);
1573 }
1574 error = 0;
1575
1576 out:
1577 xfs_da_state_free(state);
1578 return(error);
1579 }
1580
1581 /*
1582 * Fill in the disk block numbers in the state structure for the buffers
1583 * that are attached to the state structure.
1584 * This is done so that we can quickly reattach ourselves to those buffers
1585 * after some set of transaction commits have released these buffers.
1586 */
1587 STATIC int
1588 xfs_attr_fillstate(xfs_da_state_t *state)
1589 {
1590 xfs_da_state_path_t *path;
1591 xfs_da_state_blk_t *blk;
1592 int level;
1593
1594 /*
1595 * Roll down the "path" in the state structure, storing the on-disk
1596 * block number for those buffers in the "path".
1597 */
1598 path = &state->path;
1599 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1600 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1601 if (blk->bp) {
1602 blk->disk_blkno = xfs_da_blkno(blk->bp);
1603 xfs_da_buf_done(blk->bp);
1604 blk->bp = NULL;
1605 } else {
1606 blk->disk_blkno = 0;
1607 }
1608 }
1609
1610 /*
1611 * Roll down the "altpath" in the state structure, storing the on-disk
1612 * block number for those buffers in the "altpath".
1613 */
1614 path = &state->altpath;
1615 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1616 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1617 if (blk->bp) {
1618 blk->disk_blkno = xfs_da_blkno(blk->bp);
1619 xfs_da_buf_done(blk->bp);
1620 blk->bp = NULL;
1621 } else {
1622 blk->disk_blkno = 0;
1623 }
1624 }
1625
1626 return(0);
1627 }
1628
1629 /*
1630 * Reattach the buffers to the state structure based on the disk block
1631 * numbers stored in the state structure.
1632 * This is done after some set of transaction commits have released those
1633 * buffers from our grip.
1634 */
1635 STATIC int
1636 xfs_attr_refillstate(xfs_da_state_t *state)
1637 {
1638 xfs_da_state_path_t *path;
1639 xfs_da_state_blk_t *blk;
1640 int level, error;
1641
1642 /*
1643 * Roll down the "path" in the state structure, storing the on-disk
1644 * block number for those buffers in the "path".
1645 */
1646 path = &state->path;
1647 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1648 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1649 if (blk->disk_blkno) {
1650 error = xfs_da_read_buf(state->args->trans,
1651 state->args->dp,
1652 blk->blkno, blk->disk_blkno,
1653 &blk->bp, XFS_ATTR_FORK);
1654 if (error)
1655 return(error);
1656 } else {
1657 blk->bp = NULL;
1658 }
1659 }
1660
1661 /*
1662 * Roll down the "altpath" in the state structure, storing the on-disk
1663 * block number for those buffers in the "altpath".
1664 */
1665 path = &state->altpath;
1666 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1667 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1668 if (blk->disk_blkno) {
1669 error = xfs_da_read_buf(state->args->trans,
1670 state->args->dp,
1671 blk->blkno, blk->disk_blkno,
1672 &blk->bp, XFS_ATTR_FORK);
1673 if (error)
1674 return(error);
1675 } else {
1676 blk->bp = NULL;
1677 }
1678 }
1679
1680 return(0);
1681 }
1682
1683 /*
1684 * Look up a filename in a node attribute list.
1685 *
1686 * This routine gets called for any attribute fork that has more than one
1687 * block, ie: both true Btree attr lists and for single-leaf-blocks with
1688 * "remote" values taking up more blocks.
1689 */
1690 STATIC int
1691 xfs_attr_node_get(xfs_da_args_t *args)
1692 {
1693 xfs_da_state_t *state;
1694 xfs_da_state_blk_t *blk;
1695 int error, retval;
1696 int i;
1697
1698 state = xfs_da_state_alloc();
1699 state->args = args;
1700 state->mp = args->dp->i_mount;
1701 state->blocksize = state->mp->m_sb.sb_blocksize;
1702 state->node_ents = state->mp->m_attr_node_ents;
1703
1704 /*
1705 * Search to see if name exists, and get back a pointer to it.
1706 */
1707 error = xfs_da_node_lookup_int(state, &retval);
1708 if (error) {
1709 retval = error;
1710 } else if (retval == EEXIST) {
1711 blk = &state->path.blk[ state->path.active-1 ];
1712 ASSERT(blk->bp != NULL);
1713 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1714
1715 /*
1716 * Get the value, local or "remote"
1717 */
1718 retval = xfs_attr_leaf_getvalue(blk->bp, args);
1719 if (!retval && (args->rmtblkno > 0)
1720 && !(args->flags & ATTR_KERNOVAL)) {
1721 retval = xfs_attr_rmtval_get(args);
1722 }
1723 }
1724
1725 /*
1726 * If not in a transaction, we have to release all the buffers.
1727 */
1728 for (i = 0; i < state->path.active; i++) {
1729 xfs_da_brelse(args->trans, state->path.blk[i].bp);
1730 state->path.blk[i].bp = NULL;
1731 }
1732
1733 xfs_da_state_free(state);
1734 return(retval);
1735 }
1736
1737 STATIC int /* error */
1738 xfs_attr_node_list(xfs_attr_list_context_t *context)
1739 {
1740 attrlist_cursor_kern_t *cursor;
1741 xfs_attr_leafblock_t *leaf;
1742 xfs_da_intnode_t *node;
1743 xfs_da_node_entry_t *btree;
1744 int error, i;
1745 xfs_dabuf_t *bp;
1746
1747 cursor = context->cursor;
1748 cursor->initted = 1;
1749
1750 /*
1751 * Do all sorts of validation on the passed-in cursor structure.
1752 * If anything is amiss, ignore the cursor and look up the hashval
1753 * starting from the btree root.
1754 */
1755 bp = NULL;
1756 if (cursor->blkno > 0) {
1757 error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
1758 &bp, XFS_ATTR_FORK);
1759 if ((error != 0) && (error != EFSCORRUPTED))
1760 return(error);
1761 if (bp) {
1762 node = bp->data;
1763 switch (be16_to_cpu(node->hdr.info.magic)) {
1764 case XFS_DA_NODE_MAGIC:
1765 xfs_attr_trace_l_cn("wrong blk", context, node);
1766 xfs_da_brelse(NULL, bp);
1767 bp = NULL;
1768 break;
1769 case XFS_ATTR_LEAF_MAGIC:
1770 leaf = bp->data;
1771 if (cursor->hashval > be32_to_cpu(leaf->entries[
1772 be16_to_cpu(leaf->hdr.count)-1].hashval)) {
1773 xfs_attr_trace_l_cl("wrong blk",
1774 context, leaf);
1775 xfs_da_brelse(NULL, bp);
1776 bp = NULL;
1777 } else if (cursor->hashval <=
1778 be32_to_cpu(leaf->entries[0].hashval)) {
1779 xfs_attr_trace_l_cl("maybe wrong blk",
1780 context, leaf);
1781 xfs_da_brelse(NULL, bp);
1782 bp = NULL;
1783 }
1784 break;
1785 default:
1786 xfs_attr_trace_l_c("wrong blk - ??", context);
1787 xfs_da_brelse(NULL, bp);
1788 bp = NULL;
1789 }
1790 }
1791 }
1792
1793 /*
1794 * We did not find what we expected given the cursor's contents,
1795 * so we start from the top and work down based on the hash value.
1796 * Note that start of node block is same as start of leaf block.
1797 */
1798 if (bp == NULL) {
1799 cursor->blkno = 0;
1800 for (;;) {
1801 error = xfs_da_read_buf(NULL, context->dp,
1802 cursor->blkno, -1, &bp,
1803 XFS_ATTR_FORK);
1804 if (error)
1805 return(error);
1806 if (unlikely(bp == NULL)) {
1807 XFS_ERROR_REPORT("xfs_attr_node_list(2)",
1808 XFS_ERRLEVEL_LOW,
1809 context->dp->i_mount);
1810 return(XFS_ERROR(EFSCORRUPTED));
1811 }
1812 node = bp->data;
1813 if (be16_to_cpu(node->hdr.info.magic)
1814 == XFS_ATTR_LEAF_MAGIC)
1815 break;
1816 if (unlikely(be16_to_cpu(node->hdr.info.magic)
1817 != XFS_DA_NODE_MAGIC)) {
1818 XFS_CORRUPTION_ERROR("xfs_attr_node_list(3)",
1819 XFS_ERRLEVEL_LOW,
1820 context->dp->i_mount,
1821 node);
1822 xfs_da_brelse(NULL, bp);
1823 return(XFS_ERROR(EFSCORRUPTED));
1824 }
1825 btree = node->btree;
1826 for (i = 0; i < be16_to_cpu(node->hdr.count);
1827 btree++, i++) {
1828 if (cursor->hashval
1829 <= be32_to_cpu(btree->hashval)) {
1830 cursor->blkno = be32_to_cpu(btree->before);
1831 xfs_attr_trace_l_cb("descending",
1832 context, btree);
1833 break;
1834 }
1835 }
1836 if (i == be16_to_cpu(node->hdr.count)) {
1837 xfs_da_brelse(NULL, bp);
1838 return(0);
1839 }
1840 xfs_da_brelse(NULL, bp);
1841 }
1842 }
1843 ASSERT(bp != NULL);
1844
1845 /*
1846 * Roll upward through the blocks, processing each leaf block in
1847 * order. As long as there is space in the result buffer, keep
1848 * adding the information.
1849 */
1850 for (;;) {
1851 leaf = bp->data;
1852 if (unlikely(be16_to_cpu(leaf->hdr.info.magic)
1853 != XFS_ATTR_LEAF_MAGIC)) {
1854 XFS_CORRUPTION_ERROR("xfs_attr_node_list(4)",
1855 XFS_ERRLEVEL_LOW,
1856 context->dp->i_mount, leaf);
1857 xfs_da_brelse(NULL, bp);
1858 return(XFS_ERROR(EFSCORRUPTED));
1859 }
1860 error = xfs_attr_leaf_list_int(bp, context);
1861 if (error || !leaf->hdr.info.forw)
1862 break; /* not really an error, buffer full or EOF */
1863 cursor->blkno = be32_to_cpu(leaf->hdr.info.forw);
1864 xfs_da_brelse(NULL, bp);
1865 error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
1866 &bp, XFS_ATTR_FORK);
1867 if (error)
1868 return(error);
1869 if (unlikely((bp == NULL))) {
1870 XFS_ERROR_REPORT("xfs_attr_node_list(5)",
1871 XFS_ERRLEVEL_LOW,
1872 context->dp->i_mount);
1873 return(XFS_ERROR(EFSCORRUPTED));
1874 }
1875 }
1876 xfs_da_brelse(NULL, bp);
1877 return(0);
1878 }
1879
1880
1881 /*========================================================================
1882 * External routines for manipulating out-of-line attribute values.
1883 *========================================================================*/
1884
1885 /*
1886 * Read the value associated with an attribute from the out-of-line buffer
1887 * that we stored it in.
1888 */
1889 STATIC int
1890 xfs_attr_rmtval_get(xfs_da_args_t *args)
1891 {
1892 xfs_bmbt_irec_t map[ATTR_RMTVALUE_MAPSIZE];
1893 xfs_mount_t *mp;
1894 xfs_daddr_t dblkno;
1895 xfs_caddr_t dst;
1896 xfs_buf_t *bp;
1897 int nmap, error, tmp, valuelen, blkcnt, i;
1898 xfs_dablk_t lblkno;
1899
1900 ASSERT(!(args->flags & ATTR_KERNOVAL));
1901
1902 mp = args->dp->i_mount;
1903 dst = args->value;
1904 valuelen = args->valuelen;
1905 lblkno = args->rmtblkno;
1906 while (valuelen > 0) {
1907 nmap = ATTR_RMTVALUE_MAPSIZE;
1908 error = xfs_bmapi(args->trans, args->dp, (xfs_fileoff_t)lblkno,
1909 args->rmtblkcnt,
1910 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
1911 NULL, 0, map, &nmap, NULL, NULL);
1912 if (error)
1913 return(error);
1914 ASSERT(nmap >= 1);
1915
1916 for (i = 0; (i < nmap) && (valuelen > 0); i++) {
1917 ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) &&
1918 (map[i].br_startblock != HOLESTARTBLOCK));
1919 dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock);
1920 blkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
1921 error = xfs_read_buf(mp, mp->m_ddev_targp, dblkno,
1922 blkcnt, XFS_BUF_LOCK, &bp);
1923 if (error)
1924 return(error);
1925
1926 tmp = (valuelen < XFS_BUF_SIZE(bp))
1927 ? valuelen : XFS_BUF_SIZE(bp);
1928 xfs_biomove(bp, 0, tmp, dst, XFS_B_READ);
1929 xfs_buf_relse(bp);
1930 dst += tmp;
1931 valuelen -= tmp;
1932
1933 lblkno += map[i].br_blockcount;
1934 }
1935 }
1936 ASSERT(valuelen == 0);
1937 return(0);
1938 }
1939
1940 /*
1941 * Write the value associated with an attribute into the out-of-line buffer
1942 * that we have defined for it.
1943 */
1944 STATIC int
1945 xfs_attr_rmtval_set(xfs_da_args_t *args)
1946 {
1947 xfs_mount_t *mp;
1948 xfs_fileoff_t lfileoff;
1949 xfs_inode_t *dp;
1950 xfs_bmbt_irec_t map;
1951 xfs_daddr_t dblkno;
1952 xfs_caddr_t src;
1953 xfs_buf_t *bp;
1954 xfs_dablk_t lblkno;
1955 int blkcnt, valuelen, nmap, error, tmp, committed;
1956
1957 dp = args->dp;
1958 mp = dp->i_mount;
1959 src = args->value;
1960
1961 /*
1962 * Find a "hole" in the attribute address space large enough for
1963 * us to drop the new attribute's value into.
1964 */
1965 blkcnt = XFS_B_TO_FSB(mp, args->valuelen);
1966 lfileoff = 0;
1967 error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff,
1968 XFS_ATTR_FORK);
1969 if (error) {
1970 return(error);
1971 }
1972 args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff;
1973 args->rmtblkcnt = blkcnt;
1974
1975 /*
1976 * Roll through the "value", allocating blocks on disk as required.
1977 */
1978 while (blkcnt > 0) {
1979 /*
1980 * Allocate a single extent, up to the size of the value.
1981 */
1982 XFS_BMAP_INIT(args->flist, args->firstblock);
1983 nmap = 1;
1984 error = xfs_bmapi(args->trans, dp, (xfs_fileoff_t)lblkno,
1985 blkcnt,
1986 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA |
1987 XFS_BMAPI_WRITE,
1988 args->firstblock, args->total, &map, &nmap,
1989 args->flist, NULL);
1990 if (!error) {
1991 error = xfs_bmap_finish(&args->trans, args->flist,
1992 *args->firstblock, &committed);
1993 }
1994 if (error) {
1995 ASSERT(committed);
1996 args->trans = NULL;
1997 xfs_bmap_cancel(args->flist);
1998 return(error);
1999 }
2000
2001 /*
2002 * bmap_finish() may have committed the last trans and started
2003 * a new one. We need the inode to be in all transactions.
2004 */
2005 if (committed) {
2006 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
2007 xfs_trans_ihold(args->trans, dp);
2008 }
2009
2010 ASSERT(nmap == 1);
2011 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2012 (map.br_startblock != HOLESTARTBLOCK));
2013 lblkno += map.br_blockcount;
2014 blkcnt -= map.br_blockcount;
2015
2016 /*
2017 * Start the next trans in the chain.
2018 */
2019 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
2020 return (error);
2021 }
2022
2023 /*
2024 * Roll through the "value", copying the attribute value to the
2025 * already-allocated blocks. Blocks are written synchronously
2026 * so that we can know they are all on disk before we turn off
2027 * the INCOMPLETE flag.
2028 */
2029 lblkno = args->rmtblkno;
2030 valuelen = args->valuelen;
2031 while (valuelen > 0) {
2032 /*
2033 * Try to remember where we decided to put the value.
2034 */
2035 XFS_BMAP_INIT(args->flist, args->firstblock);
2036 nmap = 1;
2037 error = xfs_bmapi(NULL, dp, (xfs_fileoff_t)lblkno,
2038 args->rmtblkcnt,
2039 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2040 args->firstblock, 0, &map, &nmap,
2041 NULL, NULL);
2042 if (error) {
2043 return(error);
2044 }
2045 ASSERT(nmap == 1);
2046 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2047 (map.br_startblock != HOLESTARTBLOCK));
2048
2049 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
2050 blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
2051
2052 bp = xfs_buf_get_flags(mp->m_ddev_targp, dblkno,
2053 blkcnt, XFS_BUF_LOCK);
2054 ASSERT(bp);
2055 ASSERT(!XFS_BUF_GETERROR(bp));
2056
2057 tmp = (valuelen < XFS_BUF_SIZE(bp)) ? valuelen :
2058 XFS_BUF_SIZE(bp);
2059 xfs_biomove(bp, 0, tmp, src, XFS_B_WRITE);
2060 if (tmp < XFS_BUF_SIZE(bp))
2061 xfs_biozero(bp, tmp, XFS_BUF_SIZE(bp) - tmp);
2062 if ((error = xfs_bwrite(mp, bp))) {/* GROT: NOTE: synchronous write */
2063 return (error);
2064 }
2065 src += tmp;
2066 valuelen -= tmp;
2067
2068 lblkno += map.br_blockcount;
2069 }
2070 ASSERT(valuelen == 0);
2071 return(0);
2072 }
2073
2074 /*
2075 * Remove the value associated with an attribute by deleting the
2076 * out-of-line buffer that it is stored on.
2077 */
2078 STATIC int
2079 xfs_attr_rmtval_remove(xfs_da_args_t *args)
2080 {
2081 xfs_mount_t *mp;
2082 xfs_bmbt_irec_t map;
2083 xfs_buf_t *bp;
2084 xfs_daddr_t dblkno;
2085 xfs_dablk_t lblkno;
2086 int valuelen, blkcnt, nmap, error, done, committed;
2087
2088 mp = args->dp->i_mount;
2089
2090 /*
2091 * Roll through the "value", invalidating the attribute value's
2092 * blocks.
2093 */
2094 lblkno = args->rmtblkno;
2095 valuelen = args->rmtblkcnt;
2096 while (valuelen > 0) {
2097 /*
2098 * Try to remember where we decided to put the value.
2099 */
2100 XFS_BMAP_INIT(args->flist, args->firstblock);
2101 nmap = 1;
2102 error = xfs_bmapi(NULL, args->dp, (xfs_fileoff_t)lblkno,
2103 args->rmtblkcnt,
2104 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2105 args->firstblock, 0, &map, &nmap,
2106 args->flist, NULL);
2107 if (error) {
2108 return(error);
2109 }
2110 ASSERT(nmap == 1);
2111 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2112 (map.br_startblock != HOLESTARTBLOCK));
2113
2114 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
2115 blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
2116
2117 /*
2118 * If the "remote" value is in the cache, remove it.
2119 */
2120 bp = xfs_incore(mp->m_ddev_targp, dblkno, blkcnt,
2121 XFS_INCORE_TRYLOCK);
2122 if (bp) {
2123 XFS_BUF_STALE(bp);
2124 XFS_BUF_UNDELAYWRITE(bp);
2125 xfs_buf_relse(bp);
2126 bp = NULL;
2127 }
2128
2129 valuelen -= map.br_blockcount;
2130
2131 lblkno += map.br_blockcount;
2132 }
2133
2134 /*
2135 * Keep de-allocating extents until the remote-value region is gone.
2136 */
2137 lblkno = args->rmtblkno;
2138 blkcnt = args->rmtblkcnt;
2139 done = 0;
2140 while (!done) {
2141 XFS_BMAP_INIT(args->flist, args->firstblock);
2142 error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt,
2143 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2144 1, args->firstblock, args->flist,
2145 NULL, &done);
2146 if (!error) {
2147 error = xfs_bmap_finish(&args->trans, args->flist,
2148 *args->firstblock, &committed);
2149 }
2150 if (error) {
2151 ASSERT(committed);
2152 args->trans = NULL;
2153 xfs_bmap_cancel(args->flist);
2154 return(error);
2155 }
2156
2157 /*
2158 * bmap_finish() may have committed the last trans and started
2159 * a new one. We need the inode to be in all transactions.
2160 */
2161 if (committed) {
2162 xfs_trans_ijoin(args->trans, args->dp, XFS_ILOCK_EXCL);
2163 xfs_trans_ihold(args->trans, args->dp);
2164 }
2165
2166 /*
2167 * Close out trans and start the next one in the chain.
2168 */
2169 if ((error = xfs_attr_rolltrans(&args->trans, args->dp)))
2170 return (error);
2171 }
2172 return(0);
2173 }
2174
2175 #if defined(XFS_ATTR_TRACE)
2176 /*
2177 * Add a trace buffer entry for an attr_list context structure.
2178 */
2179 void
2180 xfs_attr_trace_l_c(char *where, struct xfs_attr_list_context *context)
2181 {
2182 xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_C, where,
2183 (__psunsigned_t)context->dp,
2184 (__psunsigned_t)context->cursor->hashval,
2185 (__psunsigned_t)context->cursor->blkno,
2186 (__psunsigned_t)context->cursor->offset,
2187 (__psunsigned_t)context->alist,
2188 (__psunsigned_t)context->bufsize,
2189 (__psunsigned_t)context->count,
2190 (__psunsigned_t)context->firstu,
2191 (__psunsigned_t)
2192 ((context->count > 0) &&
2193 !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2194 ? (ATTR_ENTRY(context->alist,
2195 context->count-1)->a_valuelen)
2196 : 0,
2197 (__psunsigned_t)context->dupcnt,
2198 (__psunsigned_t)context->flags,
2199 (__psunsigned_t)NULL,
2200 (__psunsigned_t)NULL,
2201 (__psunsigned_t)NULL);
2202 }
2203
2204 /*
2205 * Add a trace buffer entry for a context structure and a Btree node.
2206 */
2207 void
2208 xfs_attr_trace_l_cn(char *where, struct xfs_attr_list_context *context,
2209 struct xfs_da_intnode *node)
2210 {
2211 xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CN, where,
2212 (__psunsigned_t)context->dp,
2213 (__psunsigned_t)context->cursor->hashval,
2214 (__psunsigned_t)context->cursor->blkno,
2215 (__psunsigned_t)context->cursor->offset,
2216 (__psunsigned_t)context->alist,
2217 (__psunsigned_t)context->bufsize,
2218 (__psunsigned_t)context->count,
2219 (__psunsigned_t)context->firstu,
2220 (__psunsigned_t)
2221 ((context->count > 0) &&
2222 !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2223 ? (ATTR_ENTRY(context->alist,
2224 context->count-1)->a_valuelen)
2225 : 0,
2226 (__psunsigned_t)context->dupcnt,
2227 (__psunsigned_t)context->flags,
2228 (__psunsigned_t)be16_to_cpu(node->hdr.count),
2229 (__psunsigned_t)be32_to_cpu(node->btree[0].hashval),
2230 (__psunsigned_t)be32_to_cpu(node->btree[
2231 be16_to_cpu(node->hdr.count)-1].hashval));
2232 }
2233
2234 /*
2235 * Add a trace buffer entry for a context structure and a Btree element.
2236 */
2237 void
2238 xfs_attr_trace_l_cb(char *where, struct xfs_attr_list_context *context,
2239 struct xfs_da_node_entry *btree)
2240 {
2241 xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CB, where,
2242 (__psunsigned_t)context->dp,
2243 (__psunsigned_t)context->cursor->hashval,
2244 (__psunsigned_t)context->cursor->blkno,
2245 (__psunsigned_t)context->cursor->offset,
2246 (__psunsigned_t)context->alist,
2247 (__psunsigned_t)context->bufsize,
2248 (__psunsigned_t)context->count,
2249 (__psunsigned_t)context->firstu,
2250 (__psunsigned_t)
2251 ((context->count > 0) &&
2252 !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2253 ? (ATTR_ENTRY(context->alist,
2254 context->count-1)->a_valuelen)
2255 : 0,
2256 (__psunsigned_t)context->dupcnt,
2257 (__psunsigned_t)context->flags,
2258 (__psunsigned_t)be32_to_cpu(btree->hashval),
2259 (__psunsigned_t)be32_to_cpu(btree->before),
2260 (__psunsigned_t)NULL);
2261 }
2262
2263 /*
2264 * Add a trace buffer entry for a context structure and a leaf block.
2265 */
2266 void
2267 xfs_attr_trace_l_cl(char *where, struct xfs_attr_list_context *context,
2268 struct xfs_attr_leafblock *leaf)
2269 {
2270 xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CL, where,
2271 (__psunsigned_t)context->dp,
2272 (__psunsigned_t)context->cursor->hashval,
2273 (__psunsigned_t)context->cursor->blkno,
2274 (__psunsigned_t)context->cursor->offset,
2275 (__psunsigned_t)context->alist,
2276 (__psunsigned_t)context->bufsize,
2277 (__psunsigned_t)context->count,
2278 (__psunsigned_t)context->firstu,
2279 (__psunsigned_t)
2280 ((context->count > 0) &&
2281 !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2282 ? (ATTR_ENTRY(context->alist,
2283 context->count-1)->a_valuelen)
2284 : 0,
2285 (__psunsigned_t)context->dupcnt,
2286 (__psunsigned_t)context->flags,
2287 (__psunsigned_t)be16_to_cpu(leaf->hdr.count),
2288 (__psunsigned_t)be32_to_cpu(leaf->entries[0].hashval),
2289 (__psunsigned_t)be32_to_cpu(leaf->entries[
2290 be16_to_cpu(leaf->hdr.count)-1].hashval));
2291 }
2292
2293 /*
2294 * Add a trace buffer entry for the arguments given to the routine,
2295 * generic form.
2296 */
2297 void
2298 xfs_attr_trace_enter(int type, char *where,
2299 __psunsigned_t a2, __psunsigned_t a3,
2300 __psunsigned_t a4, __psunsigned_t a5,
2301 __psunsigned_t a6, __psunsigned_t a7,
2302 __psunsigned_t a8, __psunsigned_t a9,
2303 __psunsigned_t a10, __psunsigned_t a11,
2304 __psunsigned_t a12, __psunsigned_t a13,
2305 __psunsigned_t a14, __psunsigned_t a15)
2306 {
2307 ASSERT(xfs_attr_trace_buf);
2308 ktrace_enter(xfs_attr_trace_buf, (void *)((__psunsigned_t)type),
2309 (void *)where,
2310 (void *)a2, (void *)a3, (void *)a4,
2311 (void *)a5, (void *)a6, (void *)a7,
2312 (void *)a8, (void *)a9, (void *)a10,
2313 (void *)a11, (void *)a12, (void *)a13,
2314 (void *)a14, (void *)a15);
2315 }
2316 #endif /* XFS_ATTR_TRACE */
2317
2318
2319 /*========================================================================
2320 * System (pseudo) namespace attribute interface routines.
2321 *========================================================================*/
2322
2323 STATIC int
2324 posix_acl_access_set(
2325 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2326 {
2327 return xfs_acl_vset(vp, data, size, _ACL_TYPE_ACCESS);
2328 }
2329
2330 STATIC int
2331 posix_acl_access_remove(
2332 bhv_vnode_t *vp, char *name, int xflags)
2333 {
2334 return xfs_acl_vremove(vp, _ACL_TYPE_ACCESS);
2335 }
2336
2337 STATIC int
2338 posix_acl_access_get(
2339 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2340 {
2341 return xfs_acl_vget(vp, data, size, _ACL_TYPE_ACCESS);
2342 }
2343
2344 STATIC int
2345 posix_acl_access_exists(
2346 bhv_vnode_t *vp)
2347 {
2348 return xfs_acl_vhasacl_access(vp);
2349 }
2350
2351 STATIC int
2352 posix_acl_default_set(
2353 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2354 {
2355 return xfs_acl_vset(vp, data, size, _ACL_TYPE_DEFAULT);
2356 }
2357
2358 STATIC int
2359 posix_acl_default_get(
2360 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2361 {
2362 return xfs_acl_vget(vp, data, size, _ACL_TYPE_DEFAULT);
2363 }
2364
2365 STATIC int
2366 posix_acl_default_remove(
2367 bhv_vnode_t *vp, char *name, int xflags)
2368 {
2369 return xfs_acl_vremove(vp, _ACL_TYPE_DEFAULT);
2370 }
2371
2372 STATIC int
2373 posix_acl_default_exists(
2374 bhv_vnode_t *vp)
2375 {
2376 return xfs_acl_vhasacl_default(vp);
2377 }
2378
2379 STATIC struct attrnames posix_acl_access = {
2380 .attr_name = "posix_acl_access",
2381 .attr_namelen = sizeof("posix_acl_access") - 1,
2382 .attr_get = posix_acl_access_get,
2383 .attr_set = posix_acl_access_set,
2384 .attr_remove = posix_acl_access_remove,
2385 .attr_exists = posix_acl_access_exists,
2386 };
2387
2388 STATIC struct attrnames posix_acl_default = {
2389 .attr_name = "posix_acl_default",
2390 .attr_namelen = sizeof("posix_acl_default") - 1,
2391 .attr_get = posix_acl_default_get,
2392 .attr_set = posix_acl_default_set,
2393 .attr_remove = posix_acl_default_remove,
2394 .attr_exists = posix_acl_default_exists,
2395 };
2396
2397 STATIC struct attrnames *attr_system_names[] =
2398 { &posix_acl_access, &posix_acl_default };
2399
2400
2401 /*========================================================================
2402 * Namespace-prefix-style attribute name interface routines.
2403 *========================================================================*/
2404
2405 STATIC int
2406 attr_generic_set(
2407 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2408 {
2409 return -bhv_vop_attr_set(vp, name, data, size, xflags, NULL);
2410 }
2411
2412 STATIC int
2413 attr_generic_get(
2414 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2415 {
2416 int error, asize = size;
2417
2418 error = bhv_vop_attr_get(vp, name, data, &asize, xflags, NULL);
2419 if (!error)
2420 return asize;
2421 return -error;
2422 }
2423
2424 STATIC int
2425 attr_generic_remove(
2426 bhv_vnode_t *vp, char *name, int xflags)
2427 {
2428 return -bhv_vop_attr_remove(vp, name, xflags, NULL);
2429 }
2430
2431 STATIC int
2432 attr_generic_listadd(
2433 attrnames_t *prefix,
2434 attrnames_t *namesp,
2435 void *data,
2436 size_t size,
2437 ssize_t *result)
2438 {
2439 char *p = data + *result;
2440
2441 *result += prefix->attr_namelen;
2442 *result += namesp->attr_namelen + 1;
2443 if (!size)
2444 return 0;
2445 if (*result > size)
2446 return -ERANGE;
2447 strcpy(p, prefix->attr_name);
2448 p += prefix->attr_namelen;
2449 strcpy(p, namesp->attr_name);
2450 p += namesp->attr_namelen + 1;
2451 return 0;
2452 }
2453
2454 STATIC int
2455 attr_system_list(
2456 bhv_vnode_t *vp,
2457 void *data,
2458 size_t size,
2459 ssize_t *result)
2460 {
2461 attrnames_t *namesp;
2462 int i, error = 0;
2463
2464 for (i = 0; i < ATTR_SYSCOUNT; i++) {
2465 namesp = attr_system_names[i];
2466 if (!namesp->attr_exists || !namesp->attr_exists(vp))
2467 continue;
2468 error = attr_generic_listadd(&attr_system, namesp,
2469 data, size, result);
2470 if (error)
2471 break;
2472 }
2473 return error;
2474 }
2475
2476 int
2477 attr_generic_list(
2478 bhv_vnode_t *vp, void *data, size_t size, int xflags, ssize_t *result)
2479 {
2480 attrlist_cursor_kern_t cursor = { 0 };
2481 int error;
2482
2483 error = bhv_vop_attr_list(vp, data, size, xflags, &cursor, NULL);
2484 if (error > 0)
2485 return -error;
2486 *result = -error;
2487 return attr_system_list(vp, data, size, result);
2488 }
2489
2490 attrnames_t *
2491 attr_lookup_namespace(
2492 char *name,
2493 struct attrnames **names,
2494 int nnames)
2495 {
2496 int i;
2497
2498 for (i = 0; i < nnames; i++)
2499 if (!strncmp(name, names[i]->attr_name, names[i]->attr_namelen))
2500 return names[i];
2501 return NULL;
2502 }
2503
2504 /*
2505 * Some checks to prevent people abusing EAs to get over quota:
2506 * - Don't allow modifying user EAs on devices/symlinks;
2507 * - Don't allow modifying user EAs if sticky bit set;
2508 */
2509 STATIC int
2510 attr_user_capable(
2511 bhv_vnode_t *vp,
2512 cred_t *cred)
2513 {
2514 struct inode *inode = vn_to_inode(vp);
2515
2516 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
2517 return -EPERM;
2518 if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode) &&
2519 !capable(CAP_SYS_ADMIN))
2520 return -EPERM;
2521 if (S_ISDIR(inode->i_mode) && (inode->i_mode & S_ISVTX) &&
2522 (current_fsuid(cred) != inode->i_uid) && !capable(CAP_FOWNER))
2523 return -EPERM;
2524 return 0;
2525 }
2526
2527 STATIC int
2528 attr_trusted_capable(
2529 bhv_vnode_t *vp,
2530 cred_t *cred)
2531 {
2532 struct inode *inode = vn_to_inode(vp);
2533
2534 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
2535 return -EPERM;
2536 if (!capable(CAP_SYS_ADMIN))
2537 return -EPERM;
2538 return 0;
2539 }
2540
2541 STATIC int
2542 attr_secure_capable(
2543 bhv_vnode_t *vp,
2544 cred_t *cred)
2545 {
2546 return -ENOSECURITY;
2547 }
2548
2549 STATIC int
2550 attr_system_set(
2551 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2552 {
2553 attrnames_t *namesp;
2554 int error;
2555
2556 if (xflags & ATTR_CREATE)
2557 return -EINVAL;
2558
2559 namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT);
2560 if (!namesp)
2561 return -EOPNOTSUPP;
2562 error = namesp->attr_set(vp, name, data, size, xflags);
2563 if (!error)
2564 error = vn_revalidate(vp);
2565 return error;
2566 }
2567
2568 STATIC int
2569 attr_system_get(
2570 bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags)
2571 {
2572 attrnames_t *namesp;
2573
2574 namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT);
2575 if (!namesp)
2576 return -EOPNOTSUPP;
2577 return namesp->attr_get(vp, name, data, size, xflags);
2578 }
2579
2580 STATIC int
2581 attr_system_remove(
2582 bhv_vnode_t *vp, char *name, int xflags)
2583 {
2584 attrnames_t *namesp;
2585
2586 namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT);
2587 if (!namesp)
2588 return -EOPNOTSUPP;
2589 return namesp->attr_remove(vp, name, xflags);
2590 }
2591
2592 struct attrnames attr_system = {
2593 .attr_name = "system.",
2594 .attr_namelen = sizeof("system.") - 1,
2595 .attr_flag = ATTR_SYSTEM,
2596 .attr_get = attr_system_get,
2597 .attr_set = attr_system_set,
2598 .attr_remove = attr_system_remove,
2599 .attr_capable = (attrcapable_t)fs_noerr,
2600 };
2601
2602 struct attrnames attr_trusted = {
2603 .attr_name = "trusted.",
2604 .attr_namelen = sizeof("trusted.") - 1,
2605 .attr_flag = ATTR_ROOT,
2606 .attr_get = attr_generic_get,
2607 .attr_set = attr_generic_set,
2608 .attr_remove = attr_generic_remove,
2609 .attr_capable = attr_trusted_capable,
2610 };
2611
2612 struct attrnames attr_secure = {
2613 .attr_name = "security.",
2614 .attr_namelen = sizeof("security.") - 1,
2615 .attr_flag = ATTR_SECURE,
2616 .attr_get = attr_generic_get,
2617 .attr_set = attr_generic_set,
2618 .attr_remove = attr_generic_remove,
2619 .attr_capable = attr_secure_capable,
2620 };
2621
2622 struct attrnames attr_user = {
2623 .attr_name = "user.",
2624 .attr_namelen = sizeof("user.") - 1,
2625 .attr_get = attr_generic_get,
2626 .attr_set = attr_generic_set,
2627 .attr_remove = attr_generic_remove,
2628 .attr_capable = attr_user_capable,
2629 };
2630
2631 struct attrnames *attr_namespaces[] =
2632 { &attr_system, &attr_trusted, &attr_secure, &attr_user };
kernel-based virtual machine