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Linux-2.6.12-rc2
[linux-2.6/next.git] / fs / xfs / xfs_attr.c
blobee8b5904ec7ccd7e7fb0a15ec3470cd1336e2c45
1 /*
2 * Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc., 59
21 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
22 *
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
25 *
26 * http://www.sgi.com
27 *
28 * For further information regarding this notice, see:
29 *
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
31 */
32
33 #include "xfs.h"
34
35 #include "xfs_macros.h"
36 #include "xfs_types.h"
37 #include "xfs_inum.h"
38 #include "xfs_log.h"
39 #include "xfs_trans.h"
40 #include "xfs_sb.h"
41 #include "xfs_ag.h"
42 #include "xfs_dir.h"
43 #include "xfs_dir2.h"
44 #include "xfs_dmapi.h"
45 #include "xfs_mount.h"
46 #include "xfs_alloc_btree.h"
47 #include "xfs_bmap_btree.h"
48 #include "xfs_ialloc_btree.h"
49 #include "xfs_alloc.h"
50 #include "xfs_btree.h"
51 #include "xfs_attr_sf.h"
52 #include "xfs_dir_sf.h"
53 #include "xfs_dir2_sf.h"
54 #include "xfs_dinode.h"
55 #include "xfs_inode_item.h"
56 #include "xfs_inode.h"
57 #include "xfs_bmap.h"
58 #include "xfs_da_btree.h"
59 #include "xfs_attr.h"
60 #include "xfs_attr_leaf.h"
61 #include "xfs_error.h"
62 #include "xfs_bit.h"
63 #include "xfs_quota.h"
64 #include "xfs_rw.h"
65 #include "xfs_trans_space.h"
66 #include "xfs_acl.h"
67
68 /*
69 * xfs_attr.c
70 *
71 * Provide the external interfaces to manage attribute lists.
72 */
73
74 /*========================================================================
75 * Function prototypes for the kernel.
76 *========================================================================*/
77
78 /*
79 * Internal routines when attribute list fits inside the inode.
80 */
81 STATIC int xfs_attr_shortform_addname(xfs_da_args_t *args);
82
83 /*
84 * Internal routines when attribute list is one block.
85 */
86 STATIC int xfs_attr_leaf_addname(xfs_da_args_t *args);
87 STATIC int xfs_attr_leaf_removename(xfs_da_args_t *args);
88 STATIC int xfs_attr_leaf_list(xfs_attr_list_context_t *context);
89
90 /*
91 * Internal routines when attribute list is more than one block.
92 */
93 STATIC int xfs_attr_node_addname(xfs_da_args_t *args);
94 STATIC int xfs_attr_node_removename(xfs_da_args_t *args);
95 STATIC int xfs_attr_node_list(xfs_attr_list_context_t *context);
96 STATIC int xfs_attr_fillstate(xfs_da_state_t *state);
97 STATIC int xfs_attr_refillstate(xfs_da_state_t *state);
98
99 /*
100 * Routines to manipulate out-of-line attribute values.
101 */
102 STATIC int xfs_attr_rmtval_get(xfs_da_args_t *args);
103 STATIC int xfs_attr_rmtval_set(xfs_da_args_t *args);
104 STATIC int xfs_attr_rmtval_remove(xfs_da_args_t *args);
105
106 #define ATTR_RMTVALUE_MAPSIZE 1 /* # of map entries at once */
107
108 #if defined(XFS_ATTR_TRACE)
109 ktrace_t *xfs_attr_trace_buf;
110 #endif
111
112
113 /*========================================================================
114 * Overall external interface routines.
115 *========================================================================*/
116
117 int
118 xfs_attr_fetch(xfs_inode_t *ip, char *name, int namelen,
119 char *value, int *valuelenp, int flags, struct cred *cred)
120 {
121 xfs_da_args_t args;
122 int error;
123
124 if ((XFS_IFORK_Q(ip) == 0) ||
125 (ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
126 ip->i_d.di_anextents == 0))
127 return(ENOATTR);
128
129 if (!(flags & (ATTR_KERNACCESS|ATTR_SECURE))) {
130 if ((error = xfs_iaccess(ip, S_IRUSR, cred)))
131 return(XFS_ERROR(error));
132 }
133
134 /*
135 * Fill in the arg structure for this request.
136 */
137 memset((char *)&args, 0, sizeof(args));
138 args.name = name;
139 args.namelen = namelen;
140 args.value = value;
141 args.valuelen = *valuelenp;
142 args.flags = flags;
143 args.hashval = xfs_da_hashname(args.name, args.namelen);
144 args.dp = ip;
145 args.whichfork = XFS_ATTR_FORK;
146
147 /*
148 * Decide on what work routines to call based on the inode size.
149 */
150 if (XFS_IFORK_Q(ip) == 0 ||
151 (ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
152 ip->i_d.di_anextents == 0)) {
153 error = XFS_ERROR(ENOATTR);
154 } else if (ip->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
155 error = xfs_attr_shortform_getvalue(&args);
156 } else if (xfs_bmap_one_block(ip, XFS_ATTR_FORK)) {
157 error = xfs_attr_leaf_get(&args);
158 } else {
159 error = xfs_attr_node_get(&args);
160 }
161
162 /*
163 * Return the number of bytes in the value to the caller.
164 */
165 *valuelenp = args.valuelen;
166
167 if (error == EEXIST)
168 error = 0;
169 return(error);
170 }
171
172 int
173 xfs_attr_get(bhv_desc_t *bdp, char *name, char *value, int *valuelenp,
174 int flags, struct cred *cred)
175 {
176 xfs_inode_t *ip = XFS_BHVTOI(bdp);
177 int error, namelen;
178
179 XFS_STATS_INC(xs_attr_get);
180
181 if (!name)
182 return(EINVAL);
183 namelen = strlen(name);
184 if (namelen >= MAXNAMELEN)
185 return(EFAULT); /* match IRIX behaviour */
186
187 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
188 return(EIO);
189
190 xfs_ilock(ip, XFS_ILOCK_SHARED);
191 error = xfs_attr_fetch(ip, name, namelen, value, valuelenp, flags, cred);
192 xfs_iunlock(ip, XFS_ILOCK_SHARED);
193 return(error);
194 }
195
196 /*ARGSUSED*/
197 int /* error */
198 xfs_attr_set(bhv_desc_t *bdp, char *name, char *value, int valuelen, int flags,
199 struct cred *cred)
200 {
201 xfs_da_args_t args;
202 xfs_inode_t *dp;
203 xfs_fsblock_t firstblock;
204 xfs_bmap_free_t flist;
205 int error, err2, committed;
206 int local, size;
207 uint nblks;
208 xfs_mount_t *mp;
209 int rsvd = (flags & ATTR_ROOT) != 0;
210 int namelen;
211
212 namelen = strlen(name);
213 if (namelen >= MAXNAMELEN)
214 return EFAULT; /* match IRIX behaviour */
215
216 XFS_STATS_INC(xs_attr_set);
217
218 dp = XFS_BHVTOI(bdp);
219 mp = dp->i_mount;
220 if (XFS_FORCED_SHUTDOWN(mp))
221 return (EIO);
222
223 xfs_ilock(dp, XFS_ILOCK_SHARED);
224 if (!(flags & ATTR_SECURE) &&
225 (error = xfs_iaccess(dp, S_IWUSR, cred))) {
226 xfs_iunlock(dp, XFS_ILOCK_SHARED);
227 return(XFS_ERROR(error));
228 }
229 xfs_iunlock(dp, XFS_ILOCK_SHARED);
230
231 /*
232 * Attach the dquots to the inode.
233 */
234 if ((error = XFS_QM_DQATTACH(mp, dp, 0)))
235 return (error);
236
237 /*
238 * If the inode doesn't have an attribute fork, add one.
239 * (inode must not be locked when we call this routine)
240 */
241 if (XFS_IFORK_Q(dp) == 0) {
242 error = xfs_bmap_add_attrfork(dp, rsvd);
243 if (error)
244 return(error);
245 }
246
247 /*
248 * Fill in the arg structure for this request.
249 */
250 memset((char *)&args, 0, sizeof(args));
251 args.name = name;
252 args.namelen = namelen;
253 args.value = value;
254 args.valuelen = valuelen;
255 args.flags = flags;
256 args.hashval = xfs_da_hashname(args.name, args.namelen);
257 args.dp = dp;
258 args.firstblock = &firstblock;
259 args.flist = &flist;
260 args.whichfork = XFS_ATTR_FORK;
261 args.oknoent = 1;
262
263 /* Determine space new attribute will use, and if it will be inline
264 * or out of line.
265 */
266 size = xfs_attr_leaf_newentsize(&args, mp->m_sb.sb_blocksize, &local);
267
268 nblks = XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK);
269 if (local) {
270 if (size > (mp->m_sb.sb_blocksize >> 1)) {
271 /* Double split possible */
272 nblks <<= 1;
273 }
274 } else {
275 uint dblocks = XFS_B_TO_FSB(mp, valuelen);
276 /* Out of line attribute, cannot double split, but make
277 * room for the attribute value itself.
278 */
279 nblks += dblocks;
280 nblks += XFS_NEXTENTADD_SPACE_RES(mp, dblocks, XFS_ATTR_FORK);
281 }
282
283 /* Size is now blocks for attribute data */
284 args.total = nblks;
285
286 /*
287 * Start our first transaction of the day.
288 *
289 * All future transactions during this code must be "chained" off
290 * this one via the trans_dup() call. All transactions will contain
291 * the inode, and the inode will always be marked with trans_ihold().
292 * Since the inode will be locked in all transactions, we must log
293 * the inode in every transaction to let it float upward through
294 * the log.
295 */
296 args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_SET);
297
298 /*
299 * Root fork attributes can use reserved data blocks for this
300 * operation if necessary
301 */
302
303 if (rsvd)
304 args.trans->t_flags |= XFS_TRANS_RESERVE;
305
306 if ((error = xfs_trans_reserve(args.trans, (uint) nblks,
307 XFS_ATTRSET_LOG_RES(mp, nblks),
308 0, XFS_TRANS_PERM_LOG_RES,
309 XFS_ATTRSET_LOG_COUNT))) {
310 xfs_trans_cancel(args.trans, 0);
311 return(error);
312 }
313 xfs_ilock(dp, XFS_ILOCK_EXCL);
314
315 error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, args.trans, dp, nblks, 0,
316 rsvd ? XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
317 XFS_QMOPT_RES_REGBLKS);
318 if (error) {
319 xfs_iunlock(dp, XFS_ILOCK_EXCL);
320 xfs_trans_cancel(args.trans, XFS_TRANS_RELEASE_LOG_RES);
321 return (error);
322 }
323
324 xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
325 xfs_trans_ihold(args.trans, dp);
326
327 /*
328 * If the attribute list is non-existant or a shortform list,
329 * upgrade it to a single-leaf-block attribute list.
330 */
331 if ((dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
332 ((dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS) &&
333 (dp->i_d.di_anextents == 0))) {
334
335 /*
336 * Build initial attribute list (if required).
337 */
338 if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS)
339 (void)xfs_attr_shortform_create(&args);
340
341 /*
342 * Try to add the attr to the attribute list in
343 * the inode.
344 */
345 error = xfs_attr_shortform_addname(&args);
346 if (error != ENOSPC) {
347 /*
348 * Commit the shortform mods, and we're done.
349 * NOTE: this is also the error path (EEXIST, etc).
350 */
351 ASSERT(args.trans != NULL);
352
353 /*
354 * If this is a synchronous mount, make sure that
355 * the transaction goes to disk before returning
356 * to the user.
357 */
358 if (mp->m_flags & XFS_MOUNT_WSYNC) {
359 xfs_trans_set_sync(args.trans);
360 }
361 err2 = xfs_trans_commit(args.trans,
362 XFS_TRANS_RELEASE_LOG_RES,
363 NULL);
364 xfs_iunlock(dp, XFS_ILOCK_EXCL);
365
366 /*
367 * Hit the inode change time.
368 */
369 if (!error && (flags & ATTR_KERNOTIME) == 0) {
370 xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
371 }
372 return(error == 0 ? err2 : error);
373 }
374
375 /*
376 * It won't fit in the shortform, transform to a leaf block.
377 * GROT: another possible req'mt for a double-split btree op.
378 */
379 XFS_BMAP_INIT(args.flist, args.firstblock);
380 error = xfs_attr_shortform_to_leaf(&args);
381 if (!error) {
382 error = xfs_bmap_finish(&args.trans, args.flist,
383 *args.firstblock, &committed);
384 }
385 if (error) {
386 ASSERT(committed);
387 args.trans = NULL;
388 xfs_bmap_cancel(&flist);
389 goto out;
390 }
391
392 /*
393 * bmap_finish() may have committed the last trans and started
394 * a new one. We need the inode to be in all transactions.
395 */
396 if (committed) {
397 xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
398 xfs_trans_ihold(args.trans, dp);
399 }
400
401 /*
402 * Commit the leaf transformation. We'll need another (linked)
403 * transaction to add the new attribute to the leaf.
404 */
405 if ((error = xfs_attr_rolltrans(&args.trans, dp)))
406 goto out;
407
408 }
409
410 if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
411 error = xfs_attr_leaf_addname(&args);
412 } else {
413 error = xfs_attr_node_addname(&args);
414 }
415 if (error) {
416 goto out;
417 }
418
419 /*
420 * If this is a synchronous mount, make sure that the
421 * transaction goes to disk before returning to the user.
422 */
423 if (mp->m_flags & XFS_MOUNT_WSYNC) {
424 xfs_trans_set_sync(args.trans);
425 }
426
427 /*
428 * Commit the last in the sequence of transactions.
429 */
430 xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
431 error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES,
432 NULL);
433 xfs_iunlock(dp, XFS_ILOCK_EXCL);
434
435 /*
436 * Hit the inode change time.
437 */
438 if (!error && (flags & ATTR_KERNOTIME) == 0) {
439 xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
440 }
441
442 return(error);
443
444 out:
445 if (args.trans)
446 xfs_trans_cancel(args.trans,
447 XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
448 xfs_iunlock(dp, XFS_ILOCK_EXCL);
449 return(error);
450 }
451
452 /*
453 * Generic handler routine to remove a name from an attribute list.
454 * Transitions attribute list from Btree to shortform as necessary.
455 */
456 /*ARGSUSED*/
457 int /* error */
458 xfs_attr_remove(bhv_desc_t *bdp, char *name, int flags, struct cred *cred)
459 {
460 xfs_da_args_t args;
461 xfs_inode_t *dp;
462 xfs_fsblock_t firstblock;
463 xfs_bmap_free_t flist;
464 int error;
465 xfs_mount_t *mp;
466 int namelen;
467
468 ASSERT(MAXNAMELEN-1<=0xff); /* length is stored in uint8 */
469 namelen = strlen(name);
470 if (namelen>=MAXNAMELEN)
471 return EFAULT; /* match irix behaviour */
472
473 XFS_STATS_INC(xs_attr_remove);
474
475 dp = XFS_BHVTOI(bdp);
476 mp = dp->i_mount;
477 if (XFS_FORCED_SHUTDOWN(mp))
478 return (EIO);
479
480 xfs_ilock(dp, XFS_ILOCK_SHARED);
481 if (!(flags & ATTR_SECURE) &&
482 (error = xfs_iaccess(dp, S_IWUSR, cred))) {
483 xfs_iunlock(dp, XFS_ILOCK_SHARED);
484 return(XFS_ERROR(error));
485 } else if (XFS_IFORK_Q(dp) == 0 ||
486 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
487 dp->i_d.di_anextents == 0)) {
488 xfs_iunlock(dp, XFS_ILOCK_SHARED);
489 return(XFS_ERROR(ENOATTR));
490 }
491 xfs_iunlock(dp, XFS_ILOCK_SHARED);
492
493 /*
494 * Fill in the arg structure for this request.
495 */
496 memset((char *)&args, 0, sizeof(args));
497 args.name = name;
498 args.namelen = namelen;
499 args.flags = flags;
500 args.hashval = xfs_da_hashname(args.name, args.namelen);
501 args.dp = dp;
502 args.firstblock = &firstblock;
503 args.flist = &flist;
504 args.total = 0;
505 args.whichfork = XFS_ATTR_FORK;
506
507 /*
508 * Attach the dquots to the inode.
509 */
510 if ((error = XFS_QM_DQATTACH(mp, dp, 0)))
511 return (error);
512
513 /*
514 * Start our first transaction of the day.
515 *
516 * All future transactions during this code must be "chained" off
517 * this one via the trans_dup() call. All transactions will contain
518 * the inode, and the inode will always be marked with trans_ihold().
519 * Since the inode will be locked in all transactions, we must log
520 * the inode in every transaction to let it float upward through
521 * the log.
522 */
523 args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_RM);
524
525 /*
526 * Root fork attributes can use reserved data blocks for this
527 * operation if necessary
528 */
529
530 if (flags & ATTR_ROOT)
531 args.trans->t_flags |= XFS_TRANS_RESERVE;
532
533 if ((error = xfs_trans_reserve(args.trans,
534 XFS_ATTRRM_SPACE_RES(mp),
535 XFS_ATTRRM_LOG_RES(mp),
536 0, XFS_TRANS_PERM_LOG_RES,
537 XFS_ATTRRM_LOG_COUNT))) {
538 xfs_trans_cancel(args.trans, 0);
539 return(error);
540
541 }
542
543 xfs_ilock(dp, XFS_ILOCK_EXCL);
544 /*
545 * No need to make quota reservations here. We expect to release some
546 * blocks not allocate in the common case.
547 */
548 xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
549 xfs_trans_ihold(args.trans, dp);
550
551 /*
552 * Decide on what work routines to call based on the inode size.
553 */
554 if (XFS_IFORK_Q(dp) == 0 ||
555 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
556 dp->i_d.di_anextents == 0)) {
557 error = XFS_ERROR(ENOATTR);
558 goto out;
559 }
560 if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
561 ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
562 error = xfs_attr_shortform_remove(&args);
563 if (error) {
564 goto out;
565 }
566 } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
567 error = xfs_attr_leaf_removename(&args);
568 } else {
569 error = xfs_attr_node_removename(&args);
570 }
571 if (error) {
572 goto out;
573 }
574
575 /*
576 * If this is a synchronous mount, make sure that the
577 * transaction goes to disk before returning to the user.
578 */
579 if (mp->m_flags & XFS_MOUNT_WSYNC) {
580 xfs_trans_set_sync(args.trans);
581 }
582
583 /*
584 * Commit the last in the sequence of transactions.
585 */
586 xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
587 error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES,
588 NULL);
589 xfs_iunlock(dp, XFS_ILOCK_EXCL);
590
591 /*
592 * Hit the inode change time.
593 */
594 if (!error && (flags & ATTR_KERNOTIME) == 0) {
595 xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
596 }
597
598 return(error);
599
600 out:
601 if (args.trans)
602 xfs_trans_cancel(args.trans,
603 XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
604 xfs_iunlock(dp, XFS_ILOCK_EXCL);
605 return(error);
606 }
607
608 /*
609 * Generate a list of extended attribute names and optionally
610 * also value lengths. Positive return value follows the XFS
611 * convention of being an error, zero or negative return code
612 * is the length of the buffer returned (negated), indicating
613 * success.
614 */
615 int
616 xfs_attr_list(bhv_desc_t *bdp, char *buffer, int bufsize, int flags,
617 attrlist_cursor_kern_t *cursor, struct cred *cred)
618 {
619 xfs_attr_list_context_t context;
620 xfs_inode_t *dp;
621 int error;
622
623 XFS_STATS_INC(xs_attr_list);
624
625 /*
626 * Validate the cursor.
627 */
628 if (cursor->pad1 || cursor->pad2)
629 return(XFS_ERROR(EINVAL));
630 if ((cursor->initted == 0) &&
631 (cursor->hashval || cursor->blkno || cursor->offset))
632 return(XFS_ERROR(EINVAL));
633
634 /*
635 * Check for a properly aligned buffer.
636 */
637 if (((long)buffer) & (sizeof(int)-1))
638 return(XFS_ERROR(EFAULT));
639 if (flags & ATTR_KERNOVAL)
640 bufsize = 0;
641
642 /*
643 * Initialize the output buffer.
644 */
645 context.dp = dp = XFS_BHVTOI(bdp);
646 context.cursor = cursor;
647 context.count = 0;
648 context.dupcnt = 0;
649 context.resynch = 1;
650 context.flags = flags;
651 if (!(flags & ATTR_KERNAMELS)) {
652 context.bufsize = (bufsize & ~(sizeof(int)-1)); /* align */
653 context.firstu = context.bufsize;
654 context.alist = (attrlist_t *)buffer;
655 context.alist->al_count = 0;
656 context.alist->al_more = 0;
657 context.alist->al_offset[0] = context.bufsize;
658 }
659 else {
660 context.bufsize = bufsize;
661 context.firstu = context.bufsize;
662 context.alist = (attrlist_t *)buffer;
663 }
664
665 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
666 return (EIO);
667
668 xfs_ilock(dp, XFS_ILOCK_SHARED);
669 if (!(flags & ATTR_SECURE) &&
670 (error = xfs_iaccess(dp, S_IRUSR, cred))) {
671 xfs_iunlock(dp, XFS_ILOCK_SHARED);
672 return(XFS_ERROR(error));
673 }
674
675 /*
676 * Decide on what work routines to call based on the inode size.
677 */
678 xfs_attr_trace_l_c("syscall start", &context);
679 if (XFS_IFORK_Q(dp) == 0 ||
680 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
681 dp->i_d.di_anextents == 0)) {
682 error = 0;
683 } else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
684 error = xfs_attr_shortform_list(&context);
685 } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
686 error = xfs_attr_leaf_list(&context);
687 } else {
688 error = xfs_attr_node_list(&context);
689 }
690 xfs_iunlock(dp, XFS_ILOCK_SHARED);
691 xfs_attr_trace_l_c("syscall end", &context);
692
693 if (!(context.flags & (ATTR_KERNOVAL|ATTR_KERNAMELS))) {
694 ASSERT(error >= 0);
695 }
696 else { /* must return negated buffer size or the error */
697 if (context.count < 0)
698 error = XFS_ERROR(ERANGE);
699 else
700 error = -context.count;
701 }
702
703 return(error);
704 }
705
706 int /* error */
707 xfs_attr_inactive(xfs_inode_t *dp)
708 {
709 xfs_trans_t *trans;
710 xfs_mount_t *mp;
711 int error;
712
713 mp = dp->i_mount;
714 ASSERT(! XFS_NOT_DQATTACHED(mp, dp));
715
716 xfs_ilock(dp, XFS_ILOCK_SHARED);
717 if ((XFS_IFORK_Q(dp) == 0) ||
718 (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
719 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
720 dp->i_d.di_anextents == 0)) {
721 xfs_iunlock(dp, XFS_ILOCK_SHARED);
722 return(0);
723 }
724 xfs_iunlock(dp, XFS_ILOCK_SHARED);
725
726 /*
727 * Start our first transaction of the day.
728 *
729 * All future transactions during this code must be "chained" off
730 * this one via the trans_dup() call. All transactions will contain
731 * the inode, and the inode will always be marked with trans_ihold().
732 * Since the inode will be locked in all transactions, we must log
733 * the inode in every transaction to let it float upward through
734 * the log.
735 */
736 trans = xfs_trans_alloc(mp, XFS_TRANS_ATTRINVAL);
737 if ((error = xfs_trans_reserve(trans, 0, XFS_ATTRINVAL_LOG_RES(mp), 0,
738 XFS_TRANS_PERM_LOG_RES,
739 XFS_ATTRINVAL_LOG_COUNT))) {
740 xfs_trans_cancel(trans, 0);
741 return(error);
742 }
743 xfs_ilock(dp, XFS_ILOCK_EXCL);
744
745 /*
746 * No need to make quota reservations here. We expect to release some
747 * blocks, not allocate, in the common case.
748 */
749 xfs_trans_ijoin(trans, dp, XFS_ILOCK_EXCL);
750 xfs_trans_ihold(trans, dp);
751
752 /*
753 * Decide on what work routines to call based on the inode size.
754 */
755 if ((XFS_IFORK_Q(dp) == 0) ||
756 (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
757 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
758 dp->i_d.di_anextents == 0)) {
759 error = 0;
760 goto out;
761 }
762 error = xfs_attr_root_inactive(&trans, dp);
763 if (error)
764 goto out;
765 /*
766 * signal synchronous inactive transactions unless this
767 * is a synchronous mount filesystem in which case we
768 * know that we're here because we've been called out of
769 * xfs_inactive which means that the last reference is gone
770 * and the unlink transaction has already hit the disk so
771 * async inactive transactions are safe.
772 */
773 if ((error = xfs_itruncate_finish(&trans, dp, 0LL, XFS_ATTR_FORK,
774 (!(mp->m_flags & XFS_MOUNT_WSYNC)
775 ? 1 : 0))))
776 goto out;
777
778 /*
779 * Commit the last in the sequence of transactions.
780 */
781 xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
782 error = xfs_trans_commit(trans, XFS_TRANS_RELEASE_LOG_RES,
783 NULL);
784 xfs_iunlock(dp, XFS_ILOCK_EXCL);
785
786 return(error);
787
788 out:
789 xfs_trans_cancel(trans, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
790 xfs_iunlock(dp, XFS_ILOCK_EXCL);
791 return(error);
792 }
793
794
795
796 /*========================================================================
797 * External routines when attribute list is inside the inode
798 *========================================================================*/
799
800 /*
801 * Add a name to the shortform attribute list structure
802 * This is the external routine.
803 */
804 STATIC int
805 xfs_attr_shortform_addname(xfs_da_args_t *args)
806 {
807 int newsize, retval;
808
809 retval = xfs_attr_shortform_lookup(args);
810 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
811 return(retval);
812 } else if (retval == EEXIST) {
813 if (args->flags & ATTR_CREATE)
814 return(retval);
815 retval = xfs_attr_shortform_remove(args);
816 ASSERT(retval == 0);
817 }
818
819 newsize = XFS_ATTR_SF_TOTSIZE(args->dp);
820 newsize += XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
821 if ((newsize <= XFS_IFORK_ASIZE(args->dp)) &&
822 (args->namelen < XFS_ATTR_SF_ENTSIZE_MAX) &&
823 (args->valuelen < XFS_ATTR_SF_ENTSIZE_MAX)) {
824 retval = xfs_attr_shortform_add(args);
825 ASSERT(retval == 0);
826 } else {
827 return(XFS_ERROR(ENOSPC));
828 }
829 return(0);
830 }
831
832
833 /*========================================================================
834 * External routines when attribute list is one block
835 *========================================================================*/
836
837 /*
838 * Add a name to the leaf attribute list structure
839 *
840 * This leaf block cannot have a "remote" value, we only call this routine
841 * if bmap_one_block() says there is only one block (ie: no remote blks).
842 */
843 int
844 xfs_attr_leaf_addname(xfs_da_args_t *args)
845 {
846 xfs_inode_t *dp;
847 xfs_dabuf_t *bp;
848 int retval, error, committed;
849
850 /*
851 * Read the (only) block in the attribute list in.
852 */
853 dp = args->dp;
854 args->blkno = 0;
855 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
856 XFS_ATTR_FORK);
857 if (error)
858 return(error);
859 ASSERT(bp != NULL);
860
861 /*
862 * Look up the given attribute in the leaf block. Figure out if
863 * the given flags produce an error or call for an atomic rename.
864 */
865 retval = xfs_attr_leaf_lookup_int(bp, args);
866 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
867 xfs_da_brelse(args->trans, bp);
868 return(retval);
869 } else if (retval == EEXIST) {
870 if (args->flags & ATTR_CREATE) { /* pure create op */
871 xfs_da_brelse(args->trans, bp);
872 return(retval);
873 }
874 args->rename = 1; /* an atomic rename */
875 args->blkno2 = args->blkno; /* set 2nd entry info*/
876 args->index2 = args->index;
877 args->rmtblkno2 = args->rmtblkno;
878 args->rmtblkcnt2 = args->rmtblkcnt;
879 }
880
881 /*
882 * Add the attribute to the leaf block, transitioning to a Btree
883 * if required.
884 */
885 retval = xfs_attr_leaf_add(bp, args);
886 xfs_da_buf_done(bp);
887 if (retval == ENOSPC) {
888 /*
889 * Promote the attribute list to the Btree format, then
890 * Commit that transaction so that the node_addname() call
891 * can manage its own transactions.
892 */
893 XFS_BMAP_INIT(args->flist, args->firstblock);
894 error = xfs_attr_leaf_to_node(args);
895 if (!error) {
896 error = xfs_bmap_finish(&args->trans, args->flist,
897 *args->firstblock, &committed);
898 }
899 if (error) {
900 ASSERT(committed);
901 args->trans = NULL;
902 xfs_bmap_cancel(args->flist);
903 return(error);
904 }
905
906 /*
907 * bmap_finish() may have committed the last trans and started
908 * a new one. We need the inode to be in all transactions.
909 */
910 if (committed) {
911 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
912 xfs_trans_ihold(args->trans, dp);
913 }
914
915 /*
916 * Commit the current trans (including the inode) and start
917 * a new one.
918 */
919 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
920 return (error);
921
922 /*
923 * Fob the whole rest of the problem off on the Btree code.
924 */
925 error = xfs_attr_node_addname(args);
926 return(error);
927 }
928
929 /*
930 * Commit the transaction that added the attr name so that
931 * later routines can manage their own transactions.
932 */
933 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
934 return (error);
935
936 /*
937 * If there was an out-of-line value, allocate the blocks we
938 * identified for its storage and copy the value. This is done
939 * after we create the attribute so that we don't overflow the
940 * maximum size of a transaction and/or hit a deadlock.
941 */
942 if (args->rmtblkno > 0) {
943 error = xfs_attr_rmtval_set(args);
944 if (error)
945 return(error);
946 }
947
948 /*
949 * If this is an atomic rename operation, we must "flip" the
950 * incomplete flags on the "new" and "old" attribute/value pairs
951 * so that one disappears and one appears atomically. Then we
952 * must remove the "old" attribute/value pair.
953 */
954 if (args->rename) {
955 /*
956 * In a separate transaction, set the incomplete flag on the
957 * "old" attr and clear the incomplete flag on the "new" attr.
958 */
959 error = xfs_attr_leaf_flipflags(args);
960 if (error)
961 return(error);
962
963 /*
964 * Dismantle the "old" attribute/value pair by removing
965 * a "remote" value (if it exists).
966 */
967 args->index = args->index2;
968 args->blkno = args->blkno2;
969 args->rmtblkno = args->rmtblkno2;
970 args->rmtblkcnt = args->rmtblkcnt2;
971 if (args->rmtblkno) {
972 error = xfs_attr_rmtval_remove(args);
973 if (error)
974 return(error);
975 }
976
977 /*
978 * Read in the block containing the "old" attr, then
979 * remove the "old" attr from that block (neat, huh!)
980 */
981 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1,
982 &bp, XFS_ATTR_FORK);
983 if (error)
984 return(error);
985 ASSERT(bp != NULL);
986 (void)xfs_attr_leaf_remove(bp, args);
987
988 /*
989 * If the result is small enough, shrink it all into the inode.
990 */
991 if (xfs_attr_shortform_allfit(bp, dp)) {
992 XFS_BMAP_INIT(args->flist, args->firstblock);
993 error = xfs_attr_leaf_to_shortform(bp, args);
994 /* bp is gone due to xfs_da_shrink_inode */
995 if (!error) {
996 error = xfs_bmap_finish(&args->trans,
997 args->flist,
998 *args->firstblock,
999 &committed);
1000 }
1001 if (error) {
1002 ASSERT(committed);
1003 args->trans = NULL;
1004 xfs_bmap_cancel(args->flist);
1005 return(error);
1006 }
1007
1008 /*
1009 * bmap_finish() may have committed the last trans
1010 * and started a new one. We need the inode to be
1011 * in all transactions.
1012 */
1013 if (committed) {
1014 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1015 xfs_trans_ihold(args->trans, dp);
1016 }
1017 } else
1018 xfs_da_buf_done(bp);
1019
1020 /*
1021 * Commit the remove and start the next trans in series.
1022 */
1023 error = xfs_attr_rolltrans(&args->trans, dp);
1024
1025 } else if (args->rmtblkno > 0) {
1026 /*
1027 * Added a "remote" value, just clear the incomplete flag.
1028 */
1029 error = xfs_attr_leaf_clearflag(args);
1030 }
1031 return(error);
1032 }
1033
1034 /*
1035 * Remove a name from the leaf attribute list structure
1036 *
1037 * This leaf block cannot have a "remote" value, we only call this routine
1038 * if bmap_one_block() says there is only one block (ie: no remote blks).
1039 */
1040 STATIC int
1041 xfs_attr_leaf_removename(xfs_da_args_t *args)
1042 {
1043 xfs_inode_t *dp;
1044 xfs_dabuf_t *bp;
1045 int committed;
1046 int error;
1047
1048 /*
1049 * Remove the attribute.
1050 */
1051 dp = args->dp;
1052 args->blkno = 0;
1053 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
1054 XFS_ATTR_FORK);
1055 if (error) {
1056 return(error);
1057 }
1058
1059 ASSERT(bp != NULL);
1060 error = xfs_attr_leaf_lookup_int(bp, args);
1061 if (error == ENOATTR) {
1062 xfs_da_brelse(args->trans, bp);
1063 return(error);
1064 }
1065
1066 (void)xfs_attr_leaf_remove(bp, args);
1067
1068 /*
1069 * If the result is small enough, shrink it all into the inode.
1070 */
1071 if (xfs_attr_shortform_allfit(bp, dp)) {
1072 XFS_BMAP_INIT(args->flist, args->firstblock);
1073 error = xfs_attr_leaf_to_shortform(bp, args);
1074 /* bp is gone due to xfs_da_shrink_inode */
1075 if (!error) {
1076 error = xfs_bmap_finish(&args->trans, args->flist,
1077 *args->firstblock, &committed);
1078 }
1079 if (error) {
1080 ASSERT(committed);
1081 args->trans = NULL;
1082 xfs_bmap_cancel(args->flist);
1083 return(error);
1084 }
1085
1086 /*
1087 * bmap_finish() may have committed the last trans and started
1088 * a new one. We need the inode to be 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 return(0);
1097 }
1098
1099 /*
1100 * Look up a name in a leaf attribute list structure.
1101 *
1102 * This leaf block cannot have a "remote" value, we only call this routine
1103 * if bmap_one_block() says there is only one block (ie: no remote blks).
1104 */
1105 int
1106 xfs_attr_leaf_get(xfs_da_args_t *args)
1107 {
1108 xfs_dabuf_t *bp;
1109 int error;
1110
1111 args->blkno = 0;
1112 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
1113 XFS_ATTR_FORK);
1114 if (error)
1115 return(error);
1116 ASSERT(bp != NULL);
1117
1118 error = xfs_attr_leaf_lookup_int(bp, args);
1119 if (error != EEXIST) {
1120 xfs_da_brelse(args->trans, bp);
1121 return(error);
1122 }
1123 error = xfs_attr_leaf_getvalue(bp, args);
1124 xfs_da_brelse(args->trans, bp);
1125 if (!error && (args->rmtblkno > 0) && !(args->flags & ATTR_KERNOVAL)) {
1126 error = xfs_attr_rmtval_get(args);
1127 }
1128 return(error);
1129 }
1130
1131 /*
1132 * Copy out attribute entries for attr_list(), for leaf attribute lists.
1133 */
1134 STATIC int
1135 xfs_attr_leaf_list(xfs_attr_list_context_t *context)
1136 {
1137 xfs_attr_leafblock_t *leaf;
1138 int error;
1139 xfs_dabuf_t *bp;
1140
1141 context->cursor->blkno = 0;
1142 error = xfs_da_read_buf(NULL, context->dp, 0, -1, &bp, XFS_ATTR_FORK);
1143 if (error)
1144 return(error);
1145 ASSERT(bp != NULL);
1146 leaf = bp->data;
1147 if (unlikely(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
1148 != XFS_ATTR_LEAF_MAGIC)) {
1149 XFS_CORRUPTION_ERROR("xfs_attr_leaf_list", XFS_ERRLEVEL_LOW,
1150 context->dp->i_mount, leaf);
1151 xfs_da_brelse(NULL, bp);
1152 return(XFS_ERROR(EFSCORRUPTED));
1153 }
1154
1155 (void)xfs_attr_leaf_list_int(bp, context);
1156 xfs_da_brelse(NULL, bp);
1157 return(0);
1158 }
1159
1160
1161 /*========================================================================
1162 * External routines when attribute list size > XFS_LBSIZE(mp).
1163 *========================================================================*/
1164
1165 /*
1166 * Add a name to a Btree-format attribute list.
1167 *
1168 * This will involve walking down the Btree, and may involve splitting
1169 * leaf nodes and even splitting intermediate nodes up to and including
1170 * the root node (a special case of an intermediate node).
1171 *
1172 * "Remote" attribute values confuse the issue and atomic rename operations
1173 * add a whole extra layer of confusion on top of that.
1174 */
1175 STATIC int
1176 xfs_attr_node_addname(xfs_da_args_t *args)
1177 {
1178 xfs_da_state_t *state;
1179 xfs_da_state_blk_t *blk;
1180 xfs_inode_t *dp;
1181 xfs_mount_t *mp;
1182 int committed, retval, error;
1183
1184 /*
1185 * Fill in bucket of arguments/results/context to carry around.
1186 */
1187 dp = args->dp;
1188 mp = dp->i_mount;
1189 restart:
1190 state = xfs_da_state_alloc();
1191 state->args = args;
1192 state->mp = mp;
1193 state->blocksize = state->mp->m_sb.sb_blocksize;
1194 state->node_ents = state->mp->m_attr_node_ents;
1195
1196 /*
1197 * Search to see if name already exists, and get back a pointer
1198 * to where it should go.
1199 */
1200 error = xfs_da_node_lookup_int(state, &retval);
1201 if (error)
1202 goto out;
1203 blk = &state->path.blk[ state->path.active-1 ];
1204 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1205 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
1206 goto out;
1207 } else if (retval == EEXIST) {
1208 if (args->flags & ATTR_CREATE)
1209 goto out;
1210 args->rename = 1; /* atomic rename op */
1211 args->blkno2 = args->blkno; /* set 2nd entry info*/
1212 args->index2 = args->index;
1213 args->rmtblkno2 = args->rmtblkno;
1214 args->rmtblkcnt2 = args->rmtblkcnt;
1215 args->rmtblkno = 0;
1216 args->rmtblkcnt = 0;
1217 }
1218
1219 retval = xfs_attr_leaf_add(blk->bp, state->args);
1220 if (retval == ENOSPC) {
1221 if (state->path.active == 1) {
1222 /*
1223 * Its really a single leaf node, but it had
1224 * out-of-line values so it looked like it *might*
1225 * have been a b-tree.
1226 */
1227 xfs_da_state_free(state);
1228 XFS_BMAP_INIT(args->flist, args->firstblock);
1229 error = xfs_attr_leaf_to_node(args);
1230 if (!error) {
1231 error = xfs_bmap_finish(&args->trans,
1232 args->flist,
1233 *args->firstblock,
1234 &committed);
1235 }
1236 if (error) {
1237 ASSERT(committed);
1238 args->trans = NULL;
1239 xfs_bmap_cancel(args->flist);
1240 goto out;
1241 }
1242
1243 /*
1244 * bmap_finish() may have committed the last trans
1245 * and started a new one. We need the inode to be
1246 * in all transactions.
1247 */
1248 if (committed) {
1249 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1250 xfs_trans_ihold(args->trans, dp);
1251 }
1252
1253 /*
1254 * Commit the node conversion and start the next
1255 * trans in the chain.
1256 */
1257 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1258 goto out;
1259
1260 goto restart;
1261 }
1262
1263 /*
1264 * Split as many Btree elements as required.
1265 * This code tracks the new and old attr's location
1266 * in the index/blkno/rmtblkno/rmtblkcnt fields and
1267 * in the index2/blkno2/rmtblkno2/rmtblkcnt2 fields.
1268 */
1269 XFS_BMAP_INIT(args->flist, args->firstblock);
1270 error = xfs_da_split(state);
1271 if (!error) {
1272 error = xfs_bmap_finish(&args->trans, args->flist,
1273 *args->firstblock, &committed);
1274 }
1275 if (error) {
1276 ASSERT(committed);
1277 args->trans = NULL;
1278 xfs_bmap_cancel(args->flist);
1279 goto out;
1280 }
1281
1282 /*
1283 * bmap_finish() may have committed the last trans and started
1284 * a new one. We need the inode to be in all transactions.
1285 */
1286 if (committed) {
1287 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1288 xfs_trans_ihold(args->trans, dp);
1289 }
1290 } else {
1291 /*
1292 * Addition succeeded, update Btree hashvals.
1293 */
1294 xfs_da_fixhashpath(state, &state->path);
1295 }
1296
1297 /*
1298 * Kill the state structure, we're done with it and need to
1299 * allow the buffers to come back later.
1300 */
1301 xfs_da_state_free(state);
1302 state = NULL;
1303
1304 /*
1305 * Commit the leaf addition or btree split and start the next
1306 * trans in the chain.
1307 */
1308 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1309 goto out;
1310
1311 /*
1312 * If there was an out-of-line value, allocate the blocks we
1313 * identified for its storage and copy the value. This is done
1314 * after we create the attribute so that we don't overflow the
1315 * maximum size of a transaction and/or hit a deadlock.
1316 */
1317 if (args->rmtblkno > 0) {
1318 error = xfs_attr_rmtval_set(args);
1319 if (error)
1320 return(error);
1321 }
1322
1323 /*
1324 * If this is an atomic rename operation, we must "flip" the
1325 * incomplete flags on the "new" and "old" attribute/value pairs
1326 * so that one disappears and one appears atomically. Then we
1327 * must remove the "old" attribute/value pair.
1328 */
1329 if (args->rename) {
1330 /*
1331 * In a separate transaction, set the incomplete flag on the
1332 * "old" attr and clear the incomplete flag on the "new" attr.
1333 */
1334 error = xfs_attr_leaf_flipflags(args);
1335 if (error)
1336 goto out;
1337
1338 /*
1339 * Dismantle the "old" attribute/value pair by removing
1340 * a "remote" value (if it exists).
1341 */
1342 args->index = args->index2;
1343 args->blkno = args->blkno2;
1344 args->rmtblkno = args->rmtblkno2;
1345 args->rmtblkcnt = args->rmtblkcnt2;
1346 if (args->rmtblkno) {
1347 error = xfs_attr_rmtval_remove(args);
1348 if (error)
1349 return(error);
1350 }
1351
1352 /*
1353 * Re-find the "old" attribute entry after any split ops.
1354 * The INCOMPLETE flag means that we will find the "old"
1355 * attr, not the "new" one.
1356 */
1357 args->flags |= XFS_ATTR_INCOMPLETE;
1358 state = xfs_da_state_alloc();
1359 state->args = args;
1360 state->mp = mp;
1361 state->blocksize = state->mp->m_sb.sb_blocksize;
1362 state->node_ents = state->mp->m_attr_node_ents;
1363 state->inleaf = 0;
1364 error = xfs_da_node_lookup_int(state, &retval);
1365 if (error)
1366 goto out;
1367
1368 /*
1369 * Remove the name and update the hashvals in the tree.
1370 */
1371 blk = &state->path.blk[ state->path.active-1 ];
1372 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1373 error = xfs_attr_leaf_remove(blk->bp, args);
1374 xfs_da_fixhashpath(state, &state->path);
1375
1376 /*
1377 * Check to see if the tree needs to be collapsed.
1378 */
1379 if (retval && (state->path.active > 1)) {
1380 XFS_BMAP_INIT(args->flist, args->firstblock);
1381 error = xfs_da_join(state);
1382 if (!error) {
1383 error = xfs_bmap_finish(&args->trans,
1384 args->flist,
1385 *args->firstblock,
1386 &committed);
1387 }
1388 if (error) {
1389 ASSERT(committed);
1390 args->trans = NULL;
1391 xfs_bmap_cancel(args->flist);
1392 goto out;
1393 }
1394
1395 /*
1396 * bmap_finish() may have committed the last trans
1397 * and started a new one. We need the inode to be
1398 * in all transactions.
1399 */
1400 if (committed) {
1401 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1402 xfs_trans_ihold(args->trans, dp);
1403 }
1404 }
1405
1406 /*
1407 * Commit and start the next trans in the chain.
1408 */
1409 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1410 goto out;
1411
1412 } else if (args->rmtblkno > 0) {
1413 /*
1414 * Added a "remote" value, just clear the incomplete flag.
1415 */
1416 error = xfs_attr_leaf_clearflag(args);
1417 if (error)
1418 goto out;
1419 }
1420 retval = error = 0;
1421
1422 out:
1423 if (state)
1424 xfs_da_state_free(state);
1425 if (error)
1426 return(error);
1427 return(retval);
1428 }
1429
1430 /*
1431 * Remove a name from a B-tree attribute list.
1432 *
1433 * This will involve walking down the Btree, and may involve joining
1434 * leaf nodes and even joining intermediate nodes up to and including
1435 * the root node (a special case of an intermediate node).
1436 */
1437 STATIC int
1438 xfs_attr_node_removename(xfs_da_args_t *args)
1439 {
1440 xfs_da_state_t *state;
1441 xfs_da_state_blk_t *blk;
1442 xfs_inode_t *dp;
1443 xfs_dabuf_t *bp;
1444 int retval, error, committed;
1445
1446 /*
1447 * Tie a string around our finger to remind us where we are.
1448 */
1449 dp = args->dp;
1450 state = xfs_da_state_alloc();
1451 state->args = args;
1452 state->mp = dp->i_mount;
1453 state->blocksize = state->mp->m_sb.sb_blocksize;
1454 state->node_ents = state->mp->m_attr_node_ents;
1455
1456 /*
1457 * Search to see if name exists, and get back a pointer to it.
1458 */
1459 error = xfs_da_node_lookup_int(state, &retval);
1460 if (error || (retval != EEXIST)) {
1461 if (error == 0)
1462 error = retval;
1463 goto out;
1464 }
1465
1466 /*
1467 * If there is an out-of-line value, de-allocate the blocks.
1468 * This is done before we remove the attribute so that we don't
1469 * overflow the maximum size of a transaction and/or hit a deadlock.
1470 */
1471 blk = &state->path.blk[ state->path.active-1 ];
1472 ASSERT(blk->bp != NULL);
1473 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1474 if (args->rmtblkno > 0) {
1475 /*
1476 * Fill in disk block numbers in the state structure
1477 * so that we can get the buffers back after we commit
1478 * several transactions in the following calls.
1479 */
1480 error = xfs_attr_fillstate(state);
1481 if (error)
1482 goto out;
1483
1484 /*
1485 * Mark the attribute as INCOMPLETE, then bunmapi() the
1486 * remote value.
1487 */
1488 error = xfs_attr_leaf_setflag(args);
1489 if (error)
1490 goto out;
1491 error = xfs_attr_rmtval_remove(args);
1492 if (error)
1493 goto out;
1494
1495 /*
1496 * Refill the state structure with buffers, the prior calls
1497 * released our buffers.
1498 */
1499 error = xfs_attr_refillstate(state);
1500 if (error)
1501 goto out;
1502 }
1503
1504 /*
1505 * Remove the name and update the hashvals in the tree.
1506 */
1507 blk = &state->path.blk[ state->path.active-1 ];
1508 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1509 retval = xfs_attr_leaf_remove(blk->bp, args);
1510 xfs_da_fixhashpath(state, &state->path);
1511
1512 /*
1513 * Check to see if the tree needs to be collapsed.
1514 */
1515 if (retval && (state->path.active > 1)) {
1516 XFS_BMAP_INIT(args->flist, args->firstblock);
1517 error = xfs_da_join(state);
1518 if (!error) {
1519 error = xfs_bmap_finish(&args->trans, args->flist,
1520 *args->firstblock, &committed);
1521 }
1522 if (error) {
1523 ASSERT(committed);
1524 args->trans = NULL;
1525 xfs_bmap_cancel(args->flist);
1526 goto out;
1527 }
1528
1529 /*
1530 * bmap_finish() may have committed the last trans and started
1531 * a new one. We need the inode to be in all transactions.
1532 */
1533 if (committed) {
1534 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1535 xfs_trans_ihold(args->trans, dp);
1536 }
1537
1538 /*
1539 * Commit the Btree join operation and start a new trans.
1540 */
1541 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1542 goto out;
1543 }
1544
1545 /*
1546 * If the result is small enough, push it all into the inode.
1547 */
1548 if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
1549 /*
1550 * Have to get rid of the copy of this dabuf in the state.
1551 */
1552 ASSERT(state->path.active == 1);
1553 ASSERT(state->path.blk[0].bp);
1554 xfs_da_buf_done(state->path.blk[0].bp);
1555 state->path.blk[0].bp = NULL;
1556
1557 error = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp,
1558 XFS_ATTR_FORK);
1559 if (error)
1560 goto out;
1561 ASSERT(INT_GET(((xfs_attr_leafblock_t *)
1562 bp->data)->hdr.info.magic, ARCH_CONVERT)
1563 == XFS_ATTR_LEAF_MAGIC);
1564
1565 if (xfs_attr_shortform_allfit(bp, dp)) {
1566 XFS_BMAP_INIT(args->flist, args->firstblock);
1567 error = xfs_attr_leaf_to_shortform(bp, args);
1568 /* bp is gone due to xfs_da_shrink_inode */
1569 if (!error) {
1570 error = xfs_bmap_finish(&args->trans,
1571 args->flist,
1572 *args->firstblock,
1573 &committed);
1574 }
1575 if (error) {
1576 ASSERT(committed);
1577 args->trans = NULL;
1578 xfs_bmap_cancel(args->flist);
1579 goto out;
1580 }
1581
1582 /*
1583 * bmap_finish() may have committed the last trans
1584 * and started a new one. We need the inode to be
1585 * in all transactions.
1586 */
1587 if (committed) {
1588 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1589 xfs_trans_ihold(args->trans, dp);
1590 }
1591 } else
1592 xfs_da_brelse(args->trans, bp);
1593 }
1594 error = 0;
1595
1596 out:
1597 xfs_da_state_free(state);
1598 return(error);
1599 }
1600
1601 /*
1602 * Fill in the disk block numbers in the state structure for the buffers
1603 * that are attached to the state structure.
1604 * This is done so that we can quickly reattach ourselves to those buffers
1605 * after some set of transaction commit's has released these buffers.
1606 */
1607 STATIC int
1608 xfs_attr_fillstate(xfs_da_state_t *state)
1609 {
1610 xfs_da_state_path_t *path;
1611 xfs_da_state_blk_t *blk;
1612 int level;
1613
1614 /*
1615 * Roll down the "path" in the state structure, storing the on-disk
1616 * block number for those buffers in the "path".
1617 */
1618 path = &state->path;
1619 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1620 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1621 if (blk->bp) {
1622 blk->disk_blkno = xfs_da_blkno(blk->bp);
1623 xfs_da_buf_done(blk->bp);
1624 blk->bp = NULL;
1625 } else {
1626 blk->disk_blkno = 0;
1627 }
1628 }
1629
1630 /*
1631 * Roll down the "altpath" in the state structure, storing the on-disk
1632 * block number for those buffers in the "altpath".
1633 */
1634 path = &state->altpath;
1635 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1636 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1637 if (blk->bp) {
1638 blk->disk_blkno = xfs_da_blkno(blk->bp);
1639 xfs_da_buf_done(blk->bp);
1640 blk->bp = NULL;
1641 } else {
1642 blk->disk_blkno = 0;
1643 }
1644 }
1645
1646 return(0);
1647 }
1648
1649 /*
1650 * Reattach the buffers to the state structure based on the disk block
1651 * numbers stored in the state structure.
1652 * This is done after some set of transaction commit's has released those
1653 * buffers from our grip.
1654 */
1655 STATIC int
1656 xfs_attr_refillstate(xfs_da_state_t *state)
1657 {
1658 xfs_da_state_path_t *path;
1659 xfs_da_state_blk_t *blk;
1660 int level, error;
1661
1662 /*
1663 * Roll down the "path" in the state structure, storing the on-disk
1664 * block number for those buffers in the "path".
1665 */
1666 path = &state->path;
1667 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1668 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1669 if (blk->disk_blkno) {
1670 error = xfs_da_read_buf(state->args->trans,
1671 state->args->dp,
1672 blk->blkno, blk->disk_blkno,
1673 &blk->bp, XFS_ATTR_FORK);
1674 if (error)
1675 return(error);
1676 } else {
1677 blk->bp = NULL;
1678 }
1679 }
1680
1681 /*
1682 * Roll down the "altpath" in the state structure, storing the on-disk
1683 * block number for those buffers in the "altpath".
1684 */
1685 path = &state->altpath;
1686 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1687 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1688 if (blk->disk_blkno) {
1689 error = xfs_da_read_buf(state->args->trans,
1690 state->args->dp,
1691 blk->blkno, blk->disk_blkno,
1692 &blk->bp, XFS_ATTR_FORK);
1693 if (error)
1694 return(error);
1695 } else {
1696 blk->bp = NULL;
1697 }
1698 }
1699
1700 return(0);
1701 }
1702
1703 /*
1704 * Look up a filename in a node attribute list.
1705 *
1706 * This routine gets called for any attribute fork that has more than one
1707 * block, ie: both true Btree attr lists and for single-leaf-blocks with
1708 * "remote" values taking up more blocks.
1709 */
1710 int
1711 xfs_attr_node_get(xfs_da_args_t *args)
1712 {
1713 xfs_da_state_t *state;
1714 xfs_da_state_blk_t *blk;
1715 int error, retval;
1716 int i;
1717
1718 state = xfs_da_state_alloc();
1719 state->args = args;
1720 state->mp = args->dp->i_mount;
1721 state->blocksize = state->mp->m_sb.sb_blocksize;
1722 state->node_ents = state->mp->m_attr_node_ents;
1723
1724 /*
1725 * Search to see if name exists, and get back a pointer to it.
1726 */
1727 error = xfs_da_node_lookup_int(state, &retval);
1728 if (error) {
1729 retval = error;
1730 } else if (retval == EEXIST) {
1731 blk = &state->path.blk[ state->path.active-1 ];
1732 ASSERT(blk->bp != NULL);
1733 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1734
1735 /*
1736 * Get the value, local or "remote"
1737 */
1738 retval = xfs_attr_leaf_getvalue(blk->bp, args);
1739 if (!retval && (args->rmtblkno > 0)
1740 && !(args->flags & ATTR_KERNOVAL)) {
1741 retval = xfs_attr_rmtval_get(args);
1742 }
1743 }
1744
1745 /*
1746 * If not in a transaction, we have to release all the buffers.
1747 */
1748 for (i = 0; i < state->path.active; i++) {
1749 xfs_da_brelse(args->trans, state->path.blk[i].bp);
1750 state->path.blk[i].bp = NULL;
1751 }
1752
1753 xfs_da_state_free(state);
1754 return(retval);
1755 }
1756
1757 STATIC int /* error */
1758 xfs_attr_node_list(xfs_attr_list_context_t *context)
1759 {
1760 attrlist_cursor_kern_t *cursor;
1761 xfs_attr_leafblock_t *leaf;
1762 xfs_da_intnode_t *node;
1763 xfs_da_node_entry_t *btree;
1764 int error, i;
1765 xfs_dabuf_t *bp;
1766
1767 cursor = context->cursor;
1768 cursor->initted = 1;
1769
1770 /*
1771 * Do all sorts of validation on the passed-in cursor structure.
1772 * If anything is amiss, ignore the cursor and look up the hashval
1773 * starting from the btree root.
1774 */
1775 bp = NULL;
1776 if (cursor->blkno > 0) {
1777 error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
1778 &bp, XFS_ATTR_FORK);
1779 if ((error != 0) && (error != EFSCORRUPTED))
1780 return(error);
1781 if (bp) {
1782 node = bp->data;
1783 switch (INT_GET(node->hdr.info.magic, ARCH_CONVERT)) {
1784 case XFS_DA_NODE_MAGIC:
1785 xfs_attr_trace_l_cn("wrong blk", context, node);
1786 xfs_da_brelse(NULL, bp);
1787 bp = NULL;
1788 break;
1789 case XFS_ATTR_LEAF_MAGIC:
1790 leaf = bp->data;
1791 if (cursor->hashval >
1792 INT_GET(leaf->entries[
1793 INT_GET(leaf->hdr.count,
1794 ARCH_CONVERT)-1].hashval,
1795 ARCH_CONVERT)) {
1796 xfs_attr_trace_l_cl("wrong blk",
1797 context, leaf);
1798 xfs_da_brelse(NULL, bp);
1799 bp = NULL;
1800 } else if (cursor->hashval <=
1801 INT_GET(leaf->entries[0].hashval,
1802 ARCH_CONVERT)) {
1803 xfs_attr_trace_l_cl("maybe wrong blk",
1804 context, leaf);
1805 xfs_da_brelse(NULL, bp);
1806 bp = NULL;
1807 }
1808 break;
1809 default:
1810 xfs_attr_trace_l_c("wrong blk - ??", context);
1811 xfs_da_brelse(NULL, bp);
1812 bp = NULL;
1813 }
1814 }
1815 }
1816
1817 /*
1818 * We did not find what we expected given the cursor's contents,
1819 * so we start from the top and work down based on the hash value.
1820 * Note that start of node block is same as start of leaf block.
1821 */
1822 if (bp == NULL) {
1823 cursor->blkno = 0;
1824 for (;;) {
1825 error = xfs_da_read_buf(NULL, context->dp,
1826 cursor->blkno, -1, &bp,
1827 XFS_ATTR_FORK);
1828 if (error)
1829 return(error);
1830 if (unlikely(bp == NULL)) {
1831 XFS_ERROR_REPORT("xfs_attr_node_list(2)",
1832 XFS_ERRLEVEL_LOW,
1833 context->dp->i_mount);
1834 return(XFS_ERROR(EFSCORRUPTED));
1835 }
1836 node = bp->data;
1837 if (INT_GET(node->hdr.info.magic, ARCH_CONVERT)
1838 == XFS_ATTR_LEAF_MAGIC)
1839 break;
1840 if (unlikely(INT_GET(node->hdr.info.magic, ARCH_CONVERT)
1841 != XFS_DA_NODE_MAGIC)) {
1842 XFS_CORRUPTION_ERROR("xfs_attr_node_list(3)",
1843 XFS_ERRLEVEL_LOW,
1844 context->dp->i_mount,
1845 node);
1846 xfs_da_brelse(NULL, bp);
1847 return(XFS_ERROR(EFSCORRUPTED));
1848 }
1849 btree = node->btree;
1850 for (i = 0;
1851 i < INT_GET(node->hdr.count, ARCH_CONVERT);
1852 btree++, i++) {
1853 if (cursor->hashval
1854 <= INT_GET(btree->hashval,
1855 ARCH_CONVERT)) {
1856 cursor->blkno = INT_GET(btree->before, ARCH_CONVERT);
1857 xfs_attr_trace_l_cb("descending",
1858 context, btree);
1859 break;
1860 }
1861 }
1862 if (i == INT_GET(node->hdr.count, ARCH_CONVERT)) {
1863 xfs_da_brelse(NULL, bp);
1864 return(0);
1865 }
1866 xfs_da_brelse(NULL, bp);
1867 }
1868 }
1869 ASSERT(bp != NULL);
1870
1871 /*
1872 * Roll upward through the blocks, processing each leaf block in
1873 * order. As long as there is space in the result buffer, keep
1874 * adding the information.
1875 */
1876 for (;;) {
1877 leaf = bp->data;
1878 if (unlikely(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
1879 != XFS_ATTR_LEAF_MAGIC)) {
1880 XFS_CORRUPTION_ERROR("xfs_attr_node_list(4)",
1881 XFS_ERRLEVEL_LOW,
1882 context->dp->i_mount, leaf);
1883 xfs_da_brelse(NULL, bp);
1884 return(XFS_ERROR(EFSCORRUPTED));
1885 }
1886 error = xfs_attr_leaf_list_int(bp, context);
1887 if (error || !leaf->hdr.info.forw)
1888 break; /* not really an error, buffer full or EOF */
1889 cursor->blkno = INT_GET(leaf->hdr.info.forw, ARCH_CONVERT);
1890 xfs_da_brelse(NULL, bp);
1891 error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
1892 &bp, XFS_ATTR_FORK);
1893 if (error)
1894 return(error);
1895 if (unlikely((bp == NULL))) {
1896 XFS_ERROR_REPORT("xfs_attr_node_list(5)",
1897 XFS_ERRLEVEL_LOW,
1898 context->dp->i_mount);
1899 return(XFS_ERROR(EFSCORRUPTED));
1900 }
1901 }
1902 xfs_da_brelse(NULL, bp);
1903 return(0);
1904 }
1905
1906
1907 /*========================================================================
1908 * External routines for manipulating out-of-line attribute values.
1909 *========================================================================*/
1910
1911 /*
1912 * Read the value associated with an attribute from the out-of-line buffer
1913 * that we stored it in.
1914 */
1915 STATIC int
1916 xfs_attr_rmtval_get(xfs_da_args_t *args)
1917 {
1918 xfs_bmbt_irec_t map[ATTR_RMTVALUE_MAPSIZE];
1919 xfs_mount_t *mp;
1920 xfs_daddr_t dblkno;
1921 xfs_caddr_t dst;
1922 xfs_buf_t *bp;
1923 int nmap, error, tmp, valuelen, blkcnt, i;
1924 xfs_dablk_t lblkno;
1925
1926 ASSERT(!(args->flags & ATTR_KERNOVAL));
1927
1928 mp = args->dp->i_mount;
1929 dst = args->value;
1930 valuelen = args->valuelen;
1931 lblkno = args->rmtblkno;
1932 while (valuelen > 0) {
1933 nmap = ATTR_RMTVALUE_MAPSIZE;
1934 error = xfs_bmapi(args->trans, args->dp, (xfs_fileoff_t)lblkno,
1935 args->rmtblkcnt,
1936 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
1937 NULL, 0, map, &nmap, NULL);
1938 if (error)
1939 return(error);
1940 ASSERT(nmap >= 1);
1941
1942 for (i = 0; (i < nmap) && (valuelen > 0); i++) {
1943 ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) &&
1944 (map[i].br_startblock != HOLESTARTBLOCK));
1945 dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock);
1946 blkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
1947 error = xfs_read_buf(mp, mp->m_ddev_targp, dblkno,
1948 blkcnt, XFS_BUF_LOCK, &bp);
1949 if (error)
1950 return(error);
1951
1952 tmp = (valuelen < XFS_BUF_SIZE(bp))
1953 ? valuelen : XFS_BUF_SIZE(bp);
1954 xfs_biomove(bp, 0, tmp, dst, XFS_B_READ);
1955 xfs_buf_relse(bp);
1956 dst += tmp;
1957 valuelen -= tmp;
1958
1959 lblkno += map[i].br_blockcount;
1960 }
1961 }
1962 ASSERT(valuelen == 0);
1963 return(0);
1964 }
1965
1966 /*
1967 * Write the value associated with an attribute into the out-of-line buffer
1968 * that we have defined for it.
1969 */
1970 STATIC int
1971 xfs_attr_rmtval_set(xfs_da_args_t *args)
1972 {
1973 xfs_mount_t *mp;
1974 xfs_fileoff_t lfileoff;
1975 xfs_inode_t *dp;
1976 xfs_bmbt_irec_t map;
1977 xfs_daddr_t dblkno;
1978 xfs_caddr_t src;
1979 xfs_buf_t *bp;
1980 xfs_dablk_t lblkno;
1981 int blkcnt, valuelen, nmap, error, tmp, committed;
1982
1983 dp = args->dp;
1984 mp = dp->i_mount;
1985 src = args->value;
1986
1987 /*
1988 * Find a "hole" in the attribute address space large enough for
1989 * us to drop the new attribute's value into.
1990 */
1991 blkcnt = XFS_B_TO_FSB(mp, args->valuelen);
1992 lfileoff = 0;
1993 error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff,
1994 XFS_ATTR_FORK);
1995 if (error) {
1996 return(error);
1997 }
1998 args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff;
1999 args->rmtblkcnt = blkcnt;
2000
2001 /*
2002 * Roll through the "value", allocating blocks on disk as required.
2003 */
2004 while (blkcnt > 0) {
2005 /*
2006 * Allocate a single extent, up to the size of the value.
2007 */
2008 XFS_BMAP_INIT(args->flist, args->firstblock);
2009 nmap = 1;
2010 error = xfs_bmapi(args->trans, dp, (xfs_fileoff_t)lblkno,
2011 blkcnt,
2012 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA |
2013 XFS_BMAPI_WRITE,
2014 args->firstblock, args->total, &map, &nmap,
2015 args->flist);
2016 if (!error) {
2017 error = xfs_bmap_finish(&args->trans, args->flist,
2018 *args->firstblock, &committed);
2019 }
2020 if (error) {
2021 ASSERT(committed);
2022 args->trans = NULL;
2023 xfs_bmap_cancel(args->flist);
2024 return(error);
2025 }
2026
2027 /*
2028 * bmap_finish() may have committed the last trans and started
2029 * a new one. We need the inode to be in all transactions.
2030 */
2031 if (committed) {
2032 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
2033 xfs_trans_ihold(args->trans, dp);
2034 }
2035
2036 ASSERT(nmap == 1);
2037 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2038 (map.br_startblock != HOLESTARTBLOCK));
2039 lblkno += map.br_blockcount;
2040 blkcnt -= map.br_blockcount;
2041
2042 /*
2043 * Start the next trans in the chain.
2044 */
2045 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
2046 return (error);
2047 }
2048
2049 /*
2050 * Roll through the "value", copying the attribute value to the
2051 * already-allocated blocks. Blocks are written synchronously
2052 * so that we can know they are all on disk before we turn off
2053 * the INCOMPLETE flag.
2054 */
2055 lblkno = args->rmtblkno;
2056 valuelen = args->valuelen;
2057 while (valuelen > 0) {
2058 /*
2059 * Try to remember where we decided to put the value.
2060 */
2061 XFS_BMAP_INIT(args->flist, args->firstblock);
2062 nmap = 1;
2063 error = xfs_bmapi(NULL, dp, (xfs_fileoff_t)lblkno,
2064 args->rmtblkcnt,
2065 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2066 args->firstblock, 0, &map, &nmap, NULL);
2067 if (error) {
2068 return(error);
2069 }
2070 ASSERT(nmap == 1);
2071 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2072 (map.br_startblock != HOLESTARTBLOCK));
2073
2074 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
2075 blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
2076
2077 bp = xfs_buf_get_flags(mp->m_ddev_targp, dblkno,
2078 blkcnt, XFS_BUF_LOCK);
2079 ASSERT(bp);
2080 ASSERT(!XFS_BUF_GETERROR(bp));
2081
2082 tmp = (valuelen < XFS_BUF_SIZE(bp)) ? valuelen :
2083 XFS_BUF_SIZE(bp);
2084 xfs_biomove(bp, 0, tmp, src, XFS_B_WRITE);
2085 if (tmp < XFS_BUF_SIZE(bp))
2086 xfs_biozero(bp, tmp, XFS_BUF_SIZE(bp) - tmp);
2087 if ((error = xfs_bwrite(mp, bp))) {/* GROT: NOTE: synchronous write */
2088 return (error);
2089 }
2090 src += tmp;
2091 valuelen -= tmp;
2092
2093 lblkno += map.br_blockcount;
2094 }
2095 ASSERT(valuelen == 0);
2096 return(0);
2097 }
2098
2099 /*
2100 * Remove the value associated with an attribute by deleting the
2101 * out-of-line buffer that it is stored on.
2102 */
2103 STATIC int
2104 xfs_attr_rmtval_remove(xfs_da_args_t *args)
2105 {
2106 xfs_mount_t *mp;
2107 xfs_bmbt_irec_t map;
2108 xfs_buf_t *bp;
2109 xfs_daddr_t dblkno;
2110 xfs_dablk_t lblkno;
2111 int valuelen, blkcnt, nmap, error, done, committed;
2112
2113 mp = args->dp->i_mount;
2114
2115 /*
2116 * Roll through the "value", invalidating the attribute value's
2117 * blocks.
2118 */
2119 lblkno = args->rmtblkno;
2120 valuelen = args->rmtblkcnt;
2121 while (valuelen > 0) {
2122 /*
2123 * Try to remember where we decided to put the value.
2124 */
2125 XFS_BMAP_INIT(args->flist, args->firstblock);
2126 nmap = 1;
2127 error = xfs_bmapi(NULL, args->dp, (xfs_fileoff_t)lblkno,
2128 args->rmtblkcnt,
2129 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2130 args->firstblock, 0, &map, &nmap,
2131 args->flist);
2132 if (error) {
2133 return(error);
2134 }
2135 ASSERT(nmap == 1);
2136 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2137 (map.br_startblock != HOLESTARTBLOCK));
2138
2139 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
2140 blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
2141
2142 /*
2143 * If the "remote" value is in the cache, remove it.
2144 */
2145 bp = xfs_incore(mp->m_ddev_targp, dblkno, blkcnt,
2146 XFS_INCORE_TRYLOCK);
2147 if (bp) {
2148 XFS_BUF_STALE(bp);
2149 XFS_BUF_UNDELAYWRITE(bp);
2150 xfs_buf_relse(bp);
2151 bp = NULL;
2152 }
2153
2154 valuelen -= map.br_blockcount;
2155
2156 lblkno += map.br_blockcount;
2157 }
2158
2159 /*
2160 * Keep de-allocating extents until the remote-value region is gone.
2161 */
2162 lblkno = args->rmtblkno;
2163 blkcnt = args->rmtblkcnt;
2164 done = 0;
2165 while (!done) {
2166 XFS_BMAP_INIT(args->flist, args->firstblock);
2167 error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt,
2168 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2169 1, args->firstblock, args->flist, &done);
2170 if (!error) {
2171 error = xfs_bmap_finish(&args->trans, args->flist,
2172 *args->firstblock, &committed);
2173 }
2174 if (error) {
2175 ASSERT(committed);
2176 args->trans = NULL;
2177 xfs_bmap_cancel(args->flist);
2178 return(error);
2179 }
2180
2181 /*
2182 * bmap_finish() may have committed the last trans and started
2183 * a new one. We need the inode to be in all transactions.
2184 */
2185 if (committed) {
2186 xfs_trans_ijoin(args->trans, args->dp, XFS_ILOCK_EXCL);
2187 xfs_trans_ihold(args->trans, args->dp);
2188 }
2189
2190 /*
2191 * Close out trans and start the next one in the chain.
2192 */
2193 if ((error = xfs_attr_rolltrans(&args->trans, args->dp)))
2194 return (error);
2195 }
2196 return(0);
2197 }
2198
2199 #if defined(XFS_ATTR_TRACE)
2200 /*
2201 * Add a trace buffer entry for an attr_list context structure.
2202 */
2203 void
2204 xfs_attr_trace_l_c(char *where, struct xfs_attr_list_context *context)
2205 {
2206 xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_C, where,
2207 (__psunsigned_t)context->dp,
2208 (__psunsigned_t)context->cursor->hashval,
2209 (__psunsigned_t)context->cursor->blkno,
2210 (__psunsigned_t)context->cursor->offset,
2211 (__psunsigned_t)context->alist,
2212 (__psunsigned_t)context->bufsize,
2213 (__psunsigned_t)context->count,
2214 (__psunsigned_t)context->firstu,
2215 (__psunsigned_t)
2216 ((context->count > 0) &&
2217 !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2218 ? (ATTR_ENTRY(context->alist,
2219 context->count-1)->a_valuelen)
2220 : 0,
2221 (__psunsigned_t)context->dupcnt,
2222 (__psunsigned_t)context->flags,
2223 (__psunsigned_t)NULL,
2224 (__psunsigned_t)NULL,
2225 (__psunsigned_t)NULL);
2226 }
2227
2228 /*
2229 * Add a trace buffer entry for a context structure and a Btree node.
2230 */
2231 void
2232 xfs_attr_trace_l_cn(char *where, struct xfs_attr_list_context *context,
2233 struct xfs_da_intnode *node)
2234 {
2235 xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CN, where,
2236 (__psunsigned_t)context->dp,
2237 (__psunsigned_t)context->cursor->hashval,
2238 (__psunsigned_t)context->cursor->blkno,
2239 (__psunsigned_t)context->cursor->offset,
2240 (__psunsigned_t)context->alist,
2241 (__psunsigned_t)context->bufsize,
2242 (__psunsigned_t)context->count,
2243 (__psunsigned_t)context->firstu,
2244 (__psunsigned_t)
2245 ((context->count > 0) &&
2246 !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2247 ? (ATTR_ENTRY(context->alist,
2248 context->count-1)->a_valuelen)
2249 : 0,
2250 (__psunsigned_t)context->dupcnt,
2251 (__psunsigned_t)context->flags,
2252 (__psunsigned_t)INT_GET(node->hdr.count, ARCH_CONVERT),
2253 (__psunsigned_t)INT_GET(node->btree[0].hashval, ARCH_CONVERT),
2254 (__psunsigned_t)INT_GET(node->btree[INT_GET(node->hdr.count, ARCH_CONVERT)-1].hashval, ARCH_CONVERT));
2255 }
2256
2257 /*
2258 * Add a trace buffer entry for a context structure and a Btree element.
2259 */
2260 void
2261 xfs_attr_trace_l_cb(char *where, struct xfs_attr_list_context *context,
2262 struct xfs_da_node_entry *btree)
2263 {
2264 xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CB, where,
2265 (__psunsigned_t)context->dp,
2266 (__psunsigned_t)context->cursor->hashval,
2267 (__psunsigned_t)context->cursor->blkno,
2268 (__psunsigned_t)context->cursor->offset,
2269 (__psunsigned_t)context->alist,
2270 (__psunsigned_t)context->bufsize,
2271 (__psunsigned_t)context->count,
2272 (__psunsigned_t)context->firstu,
2273 (__psunsigned_t)
2274 ((context->count > 0) &&
2275 !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2276 ? (ATTR_ENTRY(context->alist,
2277 context->count-1)->a_valuelen)
2278 : 0,
2279 (__psunsigned_t)context->dupcnt,
2280 (__psunsigned_t)context->flags,
2281 (__psunsigned_t)INT_GET(btree->hashval, ARCH_CONVERT),
2282 (__psunsigned_t)INT_GET(btree->before, ARCH_CONVERT),
2283 (__psunsigned_t)NULL);
2284 }
2285
2286 /*
2287 * Add a trace buffer entry for a context structure and a leaf block.
2288 */
2289 void
2290 xfs_attr_trace_l_cl(char *where, struct xfs_attr_list_context *context,
2291 struct xfs_attr_leafblock *leaf)
2292 {
2293 xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CL, where,
2294 (__psunsigned_t)context->dp,
2295 (__psunsigned_t)context->cursor->hashval,
2296 (__psunsigned_t)context->cursor->blkno,
2297 (__psunsigned_t)context->cursor->offset,
2298 (__psunsigned_t)context->alist,
2299 (__psunsigned_t)context->bufsize,
2300 (__psunsigned_t)context->count,
2301 (__psunsigned_t)context->firstu,
2302 (__psunsigned_t)
2303 ((context->count > 0) &&
2304 !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2305 ? (ATTR_ENTRY(context->alist,
2306 context->count-1)->a_valuelen)
2307 : 0,
2308 (__psunsigned_t)context->dupcnt,
2309 (__psunsigned_t)context->flags,
2310 (__psunsigned_t)INT_GET(leaf->hdr.count, ARCH_CONVERT),
2311 (__psunsigned_t)INT_GET(leaf->entries[0].hashval, ARCH_CONVERT),
2312 (__psunsigned_t)INT_GET(leaf->entries[INT_GET(leaf->hdr.count, ARCH_CONVERT)-1].hashval, ARCH_CONVERT));
2313 }
2314
2315 /*
2316 * Add a trace buffer entry for the arguments given to the routine,
2317 * generic form.
2318 */
2319 void
2320 xfs_attr_trace_enter(int type, char *where,
2321 __psunsigned_t a2, __psunsigned_t a3,
2322 __psunsigned_t a4, __psunsigned_t a5,
2323 __psunsigned_t a6, __psunsigned_t a7,
2324 __psunsigned_t a8, __psunsigned_t a9,
2325 __psunsigned_t a10, __psunsigned_t a11,
2326 __psunsigned_t a12, __psunsigned_t a13,
2327 __psunsigned_t a14, __psunsigned_t a15)
2328 {
2329 ASSERT(xfs_attr_trace_buf);
2330 ktrace_enter(xfs_attr_trace_buf, (void *)((__psunsigned_t)type),
2331 (void *)where,
2332 (void *)a2, (void *)a3, (void *)a4,
2333 (void *)a5, (void *)a6, (void *)a7,
2334 (void *)a8, (void *)a9, (void *)a10,
2335 (void *)a11, (void *)a12, (void *)a13,
2336 (void *)a14, (void *)a15);
2337 }
2338 #endif /* XFS_ATTR_TRACE */
2339
2340
2341 /*========================================================================
2342 * System (pseudo) namespace attribute interface routines.
2343 *========================================================================*/
2344
2345 STATIC int
2346 posix_acl_access_set(
2347 vnode_t *vp, char *name, void *data, size_t size, int xflags)
2348 {
2349 return xfs_acl_vset(vp, data, size, _ACL_TYPE_ACCESS);
2350 }
2351
2352 STATIC int
2353 posix_acl_access_remove(
2354 struct vnode *vp, char *name, int xflags)
2355 {
2356 return xfs_acl_vremove(vp, _ACL_TYPE_ACCESS);
2357 }
2358
2359 STATIC int
2360 posix_acl_access_get(
2361 vnode_t *vp, char *name, void *data, size_t size, int xflags)
2362 {
2363 return xfs_acl_vget(vp, data, size, _ACL_TYPE_ACCESS);
2364 }
2365
2366 STATIC int
2367 posix_acl_access_exists(
2368 vnode_t *vp)
2369 {
2370 return xfs_acl_vhasacl_access(vp);
2371 }
2372
2373 STATIC int
2374 posix_acl_default_set(
2375 vnode_t *vp, char *name, void *data, size_t size, int xflags)
2376 {
2377 return xfs_acl_vset(vp, data, size, _ACL_TYPE_DEFAULT);
2378 }
2379
2380 STATIC int
2381 posix_acl_default_get(
2382 vnode_t *vp, char *name, void *data, size_t size, int xflags)
2383 {
2384 return xfs_acl_vget(vp, data, size, _ACL_TYPE_DEFAULT);
2385 }
2386
2387 STATIC int
2388 posix_acl_default_remove(
2389 struct vnode *vp, char *name, int xflags)
2390 {
2391 return xfs_acl_vremove(vp, _ACL_TYPE_DEFAULT);
2392 }
2393
2394 STATIC int
2395 posix_acl_default_exists(
2396 vnode_t *vp)
2397 {
2398 return xfs_acl_vhasacl_default(vp);
2399 }
2400
2401 struct attrnames posix_acl_access = {
2402 .attr_name = "posix_acl_access",
2403 .attr_namelen = sizeof("posix_acl_access") - 1,
2404 .attr_get = posix_acl_access_get,
2405 .attr_set = posix_acl_access_set,
2406 .attr_remove = posix_acl_access_remove,
2407 .attr_exists = posix_acl_access_exists,
2408 };
2409
2410 struct attrnames posix_acl_default = {
2411 .attr_name = "posix_acl_default",
2412 .attr_namelen = sizeof("posix_acl_default") - 1,
2413 .attr_get = posix_acl_default_get,
2414 .attr_set = posix_acl_default_set,
2415 .attr_remove = posix_acl_default_remove,
2416 .attr_exists = posix_acl_default_exists,
2417 };
2418
2419 struct attrnames *attr_system_names[] =
2420 { &posix_acl_access, &posix_acl_default };
2421
2422
2423 /*========================================================================
2424 * Namespace-prefix-style attribute name interface routines.
2425 *========================================================================*/
2426
2427 STATIC int
2428 attr_generic_set(
2429 struct vnode *vp, char *name, void *data, size_t size, int xflags)
2430 {
2431 int error;
2432
2433 VOP_ATTR_SET(vp, name, data, size, xflags, NULL, error);
2434 return -error;
2435 }
2436
2437 STATIC int
2438 attr_generic_get(
2439 struct vnode *vp, char *name, void *data, size_t size, int xflags)
2440 {
2441 int error, asize = size;
2442
2443 VOP_ATTR_GET(vp, name, data, &asize, xflags, NULL, error);
2444 if (!error)
2445 return asize;
2446 return -error;
2447 }
2448
2449 STATIC int
2450 attr_generic_remove(
2451 struct vnode *vp, char *name, int xflags)
2452 {
2453 int error;
2454
2455 VOP_ATTR_REMOVE(vp, name, xflags, NULL, error);
2456 return -error;
2457 }
2458
2459 STATIC int
2460 attr_generic_listadd(
2461 attrnames_t *prefix,
2462 attrnames_t *namesp,
2463 void *data,
2464 size_t size,
2465 ssize_t *result)
2466 {
2467 char *p = data + *result;
2468
2469 *result += prefix->attr_namelen;
2470 *result += namesp->attr_namelen + 1;
2471 if (!size)
2472 return 0;
2473 if (*result > size)
2474 return -ERANGE;
2475 strcpy(p, prefix->attr_name);
2476 p += prefix->attr_namelen;
2477 strcpy(p, namesp->attr_name);
2478 p += namesp->attr_namelen + 1;
2479 return 0;
2480 }
2481
2482 STATIC int
2483 attr_system_list(
2484 struct vnode *vp,
2485 void *data,
2486 size_t size,
2487 ssize_t *result)
2488 {
2489 attrnames_t *namesp;
2490 int i, error = 0;
2491
2492 for (i = 0; i < ATTR_SYSCOUNT; i++) {
2493 namesp = attr_system_names[i];
2494 if (!namesp->attr_exists || !namesp->attr_exists(vp))
2495 continue;
2496 error = attr_generic_listadd(&attr_system, namesp,
2497 data, size, result);
2498 if (error)
2499 break;
2500 }
2501 return error;
2502 }
2503
2504 int
2505 attr_generic_list(
2506 struct vnode *vp, void *data, size_t size, int xflags, ssize_t *result)
2507 {
2508 attrlist_cursor_kern_t cursor = { 0 };
2509 int error;
2510
2511 VOP_ATTR_LIST(vp, data, size, xflags, &cursor, NULL, error);
2512 if (error > 0)
2513 return -error;
2514 *result = -error;
2515 return attr_system_list(vp, data, size, result);
2516 }
2517
2518 attrnames_t *
2519 attr_lookup_namespace(
2520 char *name,
2521 struct attrnames **names,
2522 int nnames)
2523 {
2524 int i;
2525
2526 for (i = 0; i < nnames; i++)
2527 if (!strncmp(name, names[i]->attr_name, names[i]->attr_namelen))
2528 return names[i];
2529 return NULL;
2530 }
2531
2532 /*
2533 * Some checks to prevent people abusing EAs to get over quota:
2534 * - Don't allow modifying user EAs on devices/symlinks;
2535 * - Don't allow modifying user EAs if sticky bit set;
2536 */
2537 STATIC int
2538 attr_user_capable(
2539 struct vnode *vp,
2540 cred_t *cred)
2541 {
2542 struct inode *inode = LINVFS_GET_IP(vp);
2543
2544 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
2545 return -EPERM;
2546 if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode) &&
2547 !capable(CAP_SYS_ADMIN))
2548 return -EPERM;
2549 if (S_ISDIR(inode->i_mode) && (inode->i_mode & S_ISVTX) &&
2550 (current_fsuid(cred) != inode->i_uid) && !capable(CAP_FOWNER))
2551 return -EPERM;
2552 return 0;
2553 }
2554
2555 STATIC int
2556 attr_trusted_capable(
2557 struct vnode *vp,
2558 cred_t *cred)
2559 {
2560 struct inode *inode = LINVFS_GET_IP(vp);
2561
2562 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
2563 return -EPERM;
2564 if (!capable(CAP_SYS_ADMIN))
2565 return -EPERM;
2566 return 0;
2567 }
2568
2569 STATIC int
2570 attr_secure_capable(
2571 struct vnode *vp,
2572 cred_t *cred)
2573 {
2574 return -ENOSECURITY;
2575 }
2576
2577 STATIC int
2578 attr_system_set(
2579 struct vnode *vp, char *name, void *data, size_t size, int xflags)
2580 {
2581 attrnames_t *namesp;
2582 int error;
2583
2584 if (xflags & ATTR_CREATE)
2585 return -EINVAL;
2586
2587 namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT);
2588 if (!namesp)
2589 return -EOPNOTSUPP;
2590 error = namesp->attr_set(vp, name, data, size, xflags);
2591 if (!error)
2592 error = vn_revalidate(vp);
2593 return error;
2594 }
2595
2596 STATIC int
2597 attr_system_get(
2598 struct vnode *vp, char *name, void *data, size_t size, int xflags)
2599 {
2600 attrnames_t *namesp;
2601
2602 namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT);
2603 if (!namesp)
2604 return -EOPNOTSUPP;
2605 return namesp->attr_get(vp, name, data, size, xflags);
2606 }
2607
2608 STATIC int
2609 attr_system_remove(
2610 struct vnode *vp, char *name, int xflags)
2611 {
2612 attrnames_t *namesp;
2613
2614 namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT);
2615 if (!namesp)
2616 return -EOPNOTSUPP;
2617 return namesp->attr_remove(vp, name, xflags);
2618 }
2619
2620 struct attrnames attr_system = {
2621 .attr_name = "system.",
2622 .attr_namelen = sizeof("system.") - 1,
2623 .attr_flag = ATTR_SYSTEM,
2624 .attr_get = attr_system_get,
2625 .attr_set = attr_system_set,
2626 .attr_remove = attr_system_remove,
2627 .attr_capable = (attrcapable_t)fs_noerr,
2628 };
2629
2630 struct attrnames attr_trusted = {
2631 .attr_name = "trusted.",
2632 .attr_namelen = sizeof("trusted.") - 1,
2633 .attr_flag = ATTR_ROOT,
2634 .attr_get = attr_generic_get,
2635 .attr_set = attr_generic_set,
2636 .attr_remove = attr_generic_remove,
2637 .attr_capable = attr_trusted_capable,
2638 };
2639
2640 struct attrnames attr_secure = {
2641 .attr_name = "security.",
2642 .attr_namelen = sizeof("security.") - 1,
2643 .attr_flag = ATTR_SECURE,
2644 .attr_get = attr_generic_get,
2645 .attr_set = attr_generic_set,
2646 .attr_remove = attr_generic_remove,
2647 .attr_capable = attr_secure_capable,
2648 };
2649
2650 struct attrnames attr_user = {
2651 .attr_name = "user.",
2652 .attr_namelen = sizeof("user.") - 1,
2653 .attr_get = attr_generic_get,
2654 .attr_set = attr_generic_set,
2655 .attr_remove = attr_generic_remove,
2656 .attr_capable = attr_user_capable,
2657 };
2658
2659 struct attrnames *attr_namespaces[] =
2660 { &attr_system, &attr_trusted, &attr_secure, &attr_user };
linux-next