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Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable
[deliverable/linux.git] / fs / ocfs2 / xattr.c
1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * xattr.c
5 *
6 * Copyright (C) 2004, 2008 Oracle. All rights reserved.
7 *
8 * CREDITS:
9 * Lots of code in this file is copy from linux/fs/ext3/xattr.c.
10 * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public
14 * License version 2 as published by the Free Software Foundation.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 */
21
22 #include <linux/capability.h>
23 #include <linux/fs.h>
24 #include <linux/types.h>
25 #include <linux/slab.h>
26 #include <linux/highmem.h>
27 #include <linux/pagemap.h>
28 #include <linux/uio.h>
29 #include <linux/sched.h>
30 #include <linux/splice.h>
31 #include <linux/mount.h>
32 #include <linux/writeback.h>
33 #include <linux/falloc.h>
34 #include <linux/sort.h>
35 #include <linux/init.h>
36 #include <linux/module.h>
37 #include <linux/string.h>
38 #include <linux/security.h>
39
40 #define MLOG_MASK_PREFIX ML_XATTR
41 #include <cluster/masklog.h>
42
43 #include "ocfs2.h"
44 #include "alloc.h"
45 #include "blockcheck.h"
46 #include "dlmglue.h"
47 #include "file.h"
48 #include "symlink.h"
49 #include "sysfile.h"
50 #include "inode.h"
51 #include "journal.h"
52 #include "ocfs2_fs.h"
53 #include "suballoc.h"
54 #include "uptodate.h"
55 #include "buffer_head_io.h"
56 #include "super.h"
57 #include "xattr.h"
58
59
60 struct ocfs2_xattr_def_value_root {
61 struct ocfs2_xattr_value_root xv;
62 struct ocfs2_extent_rec er;
63 };
64
65 struct ocfs2_xattr_bucket {
66 /* The inode these xattrs are associated with */
67 struct inode *bu_inode;
68
69 /* The actual buffers that make up the bucket */
70 struct buffer_head *bu_bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET];
71
72 /* How many blocks make up one bucket for this filesystem */
73 int bu_blocks;
74 };
75
76 struct ocfs2_xattr_set_ctxt {
77 handle_t *handle;
78 struct ocfs2_alloc_context *meta_ac;
79 struct ocfs2_alloc_context *data_ac;
80 struct ocfs2_cached_dealloc_ctxt dealloc;
81 };
82
83 #define OCFS2_XATTR_ROOT_SIZE (sizeof(struct ocfs2_xattr_def_value_root))
84 #define OCFS2_XATTR_INLINE_SIZE 80
85 #define OCFS2_XATTR_HEADER_GAP 4
86 #define OCFS2_XATTR_FREE_IN_IBODY (OCFS2_MIN_XATTR_INLINE_SIZE \
87 - sizeof(struct ocfs2_xattr_header) \
88 - OCFS2_XATTR_HEADER_GAP)
89 #define OCFS2_XATTR_FREE_IN_BLOCK(ptr) ((ptr)->i_sb->s_blocksize \
90 - sizeof(struct ocfs2_xattr_block) \
91 - sizeof(struct ocfs2_xattr_header) \
92 - OCFS2_XATTR_HEADER_GAP)
93
94 static struct ocfs2_xattr_def_value_root def_xv = {
95 .xv.xr_list.l_count = cpu_to_le16(1),
96 };
97
98 struct xattr_handler *ocfs2_xattr_handlers[] = {
99 &ocfs2_xattr_user_handler,
100 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
101 &ocfs2_xattr_acl_access_handler,
102 &ocfs2_xattr_acl_default_handler,
103 #endif
104 &ocfs2_xattr_trusted_handler,
105 &ocfs2_xattr_security_handler,
106 NULL
107 };
108
109 static struct xattr_handler *ocfs2_xattr_handler_map[OCFS2_XATTR_MAX] = {
110 [OCFS2_XATTR_INDEX_USER] = &ocfs2_xattr_user_handler,
111 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
112 [OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS]
113 = &ocfs2_xattr_acl_access_handler,
114 [OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT]
115 = &ocfs2_xattr_acl_default_handler,
116 #endif
117 [OCFS2_XATTR_INDEX_TRUSTED] = &ocfs2_xattr_trusted_handler,
118 [OCFS2_XATTR_INDEX_SECURITY] = &ocfs2_xattr_security_handler,
119 };
120
121 struct ocfs2_xattr_info {
122 int name_index;
123 const char *name;
124 const void *value;
125 size_t value_len;
126 };
127
128 struct ocfs2_xattr_search {
129 struct buffer_head *inode_bh;
130 /*
131 * xattr_bh point to the block buffer head which has extended attribute
132 * when extended attribute in inode, xattr_bh is equal to inode_bh.
133 */
134 struct buffer_head *xattr_bh;
135 struct ocfs2_xattr_header *header;
136 struct ocfs2_xattr_bucket *bucket;
137 void *base;
138 void *end;
139 struct ocfs2_xattr_entry *here;
140 int not_found;
141 };
142
143 static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
144 struct ocfs2_xattr_header *xh,
145 int index,
146 int *block_off,
147 int *new_offset);
148
149 static int ocfs2_xattr_block_find(struct inode *inode,
150 int name_index,
151 const char *name,
152 struct ocfs2_xattr_search *xs);
153 static int ocfs2_xattr_index_block_find(struct inode *inode,
154 struct buffer_head *root_bh,
155 int name_index,
156 const char *name,
157 struct ocfs2_xattr_search *xs);
158
159 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
160 struct ocfs2_xattr_tree_root *xt,
161 char *buffer,
162 size_t buffer_size);
163
164 static int ocfs2_xattr_create_index_block(struct inode *inode,
165 struct ocfs2_xattr_search *xs,
166 struct ocfs2_xattr_set_ctxt *ctxt);
167
168 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
169 struct ocfs2_xattr_info *xi,
170 struct ocfs2_xattr_search *xs,
171 struct ocfs2_xattr_set_ctxt *ctxt);
172
173 static int ocfs2_delete_xattr_index_block(struct inode *inode,
174 struct buffer_head *xb_bh);
175 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
176 u64 src_blk, u64 last_blk, u64 to_blk,
177 unsigned int start_bucket,
178 u32 *first_hash);
179
180 static inline u16 ocfs2_xattr_buckets_per_cluster(struct ocfs2_super *osb)
181 {
182 return (1 << osb->s_clustersize_bits) / OCFS2_XATTR_BUCKET_SIZE;
183 }
184
185 static inline u16 ocfs2_blocks_per_xattr_bucket(struct super_block *sb)
186 {
187 return OCFS2_XATTR_BUCKET_SIZE / (1 << sb->s_blocksize_bits);
188 }
189
190 static inline u16 ocfs2_xattr_max_xe_in_bucket(struct super_block *sb)
191 {
192 u16 len = sb->s_blocksize -
193 offsetof(struct ocfs2_xattr_header, xh_entries);
194
195 return len / sizeof(struct ocfs2_xattr_entry);
196 }
197
198 #define bucket_blkno(_b) ((_b)->bu_bhs[0]->b_blocknr)
199 #define bucket_block(_b, _n) ((_b)->bu_bhs[(_n)]->b_data)
200 #define bucket_xh(_b) ((struct ocfs2_xattr_header *)bucket_block((_b), 0))
201
202 static struct ocfs2_xattr_bucket *ocfs2_xattr_bucket_new(struct inode *inode)
203 {
204 struct ocfs2_xattr_bucket *bucket;
205 int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
206
207 BUG_ON(blks > OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET);
208
209 bucket = kzalloc(sizeof(struct ocfs2_xattr_bucket), GFP_NOFS);
210 if (bucket) {
211 bucket->bu_inode = inode;
212 bucket->bu_blocks = blks;
213 }
214
215 return bucket;
216 }
217
218 static void ocfs2_xattr_bucket_relse(struct ocfs2_xattr_bucket *bucket)
219 {
220 int i;
221
222 for (i = 0; i < bucket->bu_blocks; i++) {
223 brelse(bucket->bu_bhs[i]);
224 bucket->bu_bhs[i] = NULL;
225 }
226 }
227
228 static void ocfs2_xattr_bucket_free(struct ocfs2_xattr_bucket *bucket)
229 {
230 if (bucket) {
231 ocfs2_xattr_bucket_relse(bucket);
232 bucket->bu_inode = NULL;
233 kfree(bucket);
234 }
235 }
236
237 /*
238 * A bucket that has never been written to disk doesn't need to be
239 * read. We just need the buffer_heads. Don't call this for
240 * buckets that are already on disk. ocfs2_read_xattr_bucket() initializes
241 * them fully.
242 */
243 static int ocfs2_init_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
244 u64 xb_blkno)
245 {
246 int i, rc = 0;
247
248 for (i = 0; i < bucket->bu_blocks; i++) {
249 bucket->bu_bhs[i] = sb_getblk(bucket->bu_inode->i_sb,
250 xb_blkno + i);
251 if (!bucket->bu_bhs[i]) {
252 rc = -EIO;
253 mlog_errno(rc);
254 break;
255 }
256
257 if (!ocfs2_buffer_uptodate(bucket->bu_inode,
258 bucket->bu_bhs[i]))
259 ocfs2_set_new_buffer_uptodate(bucket->bu_inode,
260 bucket->bu_bhs[i]);
261 }
262
263 if (rc)
264 ocfs2_xattr_bucket_relse(bucket);
265 return rc;
266 }
267
268 /* Read the xattr bucket at xb_blkno */
269 static int ocfs2_read_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
270 u64 xb_blkno)
271 {
272 int rc;
273
274 rc = ocfs2_read_blocks(bucket->bu_inode, xb_blkno,
275 bucket->bu_blocks, bucket->bu_bhs, 0,
276 NULL);
277 if (!rc) {
278 spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
279 rc = ocfs2_validate_meta_ecc_bhs(bucket->bu_inode->i_sb,
280 bucket->bu_bhs,
281 bucket->bu_blocks,
282 &bucket_xh(bucket)->xh_check);
283 spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
284 if (rc)
285 mlog_errno(rc);
286 }
287
288 if (rc)
289 ocfs2_xattr_bucket_relse(bucket);
290 return rc;
291 }
292
293 static int ocfs2_xattr_bucket_journal_access(handle_t *handle,
294 struct ocfs2_xattr_bucket *bucket,
295 int type)
296 {
297 int i, rc = 0;
298
299 for (i = 0; i < bucket->bu_blocks; i++) {
300 rc = ocfs2_journal_access(handle, bucket->bu_inode,
301 bucket->bu_bhs[i], type);
302 if (rc) {
303 mlog_errno(rc);
304 break;
305 }
306 }
307
308 return rc;
309 }
310
311 static void ocfs2_xattr_bucket_journal_dirty(handle_t *handle,
312 struct ocfs2_xattr_bucket *bucket)
313 {
314 int i;
315
316 spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
317 ocfs2_compute_meta_ecc_bhs(bucket->bu_inode->i_sb,
318 bucket->bu_bhs, bucket->bu_blocks,
319 &bucket_xh(bucket)->xh_check);
320 spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
321
322 for (i = 0; i < bucket->bu_blocks; i++)
323 ocfs2_journal_dirty(handle, bucket->bu_bhs[i]);
324 }
325
326 static void ocfs2_xattr_bucket_copy_data(struct ocfs2_xattr_bucket *dest,
327 struct ocfs2_xattr_bucket *src)
328 {
329 int i;
330 int blocksize = src->bu_inode->i_sb->s_blocksize;
331
332 BUG_ON(dest->bu_blocks != src->bu_blocks);
333 BUG_ON(dest->bu_inode != src->bu_inode);
334
335 for (i = 0; i < src->bu_blocks; i++) {
336 memcpy(bucket_block(dest, i), bucket_block(src, i),
337 blocksize);
338 }
339 }
340
341 static int ocfs2_validate_xattr_block(struct super_block *sb,
342 struct buffer_head *bh)
343 {
344 int rc;
345 struct ocfs2_xattr_block *xb =
346 (struct ocfs2_xattr_block *)bh->b_data;
347
348 mlog(0, "Validating xattr block %llu\n",
349 (unsigned long long)bh->b_blocknr);
350
351 BUG_ON(!buffer_uptodate(bh));
352
353 /*
354 * If the ecc fails, we return the error but otherwise
355 * leave the filesystem running. We know any error is
356 * local to this block.
357 */
358 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &xb->xb_check);
359 if (rc)
360 return rc;
361
362 /*
363 * Errors after here are fatal
364 */
365
366 if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
367 ocfs2_error(sb,
368 "Extended attribute block #%llu has bad "
369 "signature %.*s",
370 (unsigned long long)bh->b_blocknr, 7,
371 xb->xb_signature);
372 return -EINVAL;
373 }
374
375 if (le64_to_cpu(xb->xb_blkno) != bh->b_blocknr) {
376 ocfs2_error(sb,
377 "Extended attribute block #%llu has an "
378 "invalid xb_blkno of %llu",
379 (unsigned long long)bh->b_blocknr,
380 (unsigned long long)le64_to_cpu(xb->xb_blkno));
381 return -EINVAL;
382 }
383
384 if (le32_to_cpu(xb->xb_fs_generation) != OCFS2_SB(sb)->fs_generation) {
385 ocfs2_error(sb,
386 "Extended attribute block #%llu has an invalid "
387 "xb_fs_generation of #%u",
388 (unsigned long long)bh->b_blocknr,
389 le32_to_cpu(xb->xb_fs_generation));
390 return -EINVAL;
391 }
392
393 return 0;
394 }
395
396 static int ocfs2_read_xattr_block(struct inode *inode, u64 xb_blkno,
397 struct buffer_head **bh)
398 {
399 int rc;
400 struct buffer_head *tmp = *bh;
401
402 rc = ocfs2_read_block(inode, xb_blkno, &tmp,
403 ocfs2_validate_xattr_block);
404
405 /* If ocfs2_read_block() got us a new bh, pass it up. */
406 if (!rc && !*bh)
407 *bh = tmp;
408
409 return rc;
410 }
411
412 static inline const char *ocfs2_xattr_prefix(int name_index)
413 {
414 struct xattr_handler *handler = NULL;
415
416 if (name_index > 0 && name_index < OCFS2_XATTR_MAX)
417 handler = ocfs2_xattr_handler_map[name_index];
418
419 return handler ? handler->prefix : NULL;
420 }
421
422 static u32 ocfs2_xattr_name_hash(struct inode *inode,
423 const char *name,
424 int name_len)
425 {
426 /* Get hash value of uuid from super block */
427 u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash;
428 int i;
429
430 /* hash extended attribute name */
431 for (i = 0; i < name_len; i++) {
432 hash = (hash << OCFS2_HASH_SHIFT) ^
433 (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
434 *name++;
435 }
436
437 return hash;
438 }
439
440 /*
441 * ocfs2_xattr_hash_entry()
442 *
443 * Compute the hash of an extended attribute.
444 */
445 static void ocfs2_xattr_hash_entry(struct inode *inode,
446 struct ocfs2_xattr_header *header,
447 struct ocfs2_xattr_entry *entry)
448 {
449 u32 hash = 0;
450 char *name = (char *)header + le16_to_cpu(entry->xe_name_offset);
451
452 hash = ocfs2_xattr_name_hash(inode, name, entry->xe_name_len);
453 entry->xe_name_hash = cpu_to_le32(hash);
454
455 return;
456 }
457
458 static int ocfs2_xattr_entry_real_size(int name_len, size_t value_len)
459 {
460 int size = 0;
461
462 if (value_len <= OCFS2_XATTR_INLINE_SIZE)
463 size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(value_len);
464 else
465 size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
466 size += sizeof(struct ocfs2_xattr_entry);
467
468 return size;
469 }
470
471 int ocfs2_calc_security_init(struct inode *dir,
472 struct ocfs2_security_xattr_info *si,
473 int *want_clusters,
474 int *xattr_credits,
475 struct ocfs2_alloc_context **xattr_ac)
476 {
477 int ret = 0;
478 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
479 int s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
480 si->value_len);
481
482 /*
483 * The max space of security xattr taken inline is
484 * 256(name) + 80(value) + 16(entry) = 352 bytes,
485 * So reserve one metadata block for it is ok.
486 */
487 if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
488 s_size > OCFS2_XATTR_FREE_IN_IBODY) {
489 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, xattr_ac);
490 if (ret) {
491 mlog_errno(ret);
492 return ret;
493 }
494 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
495 }
496
497 /* reserve clusters for xattr value which will be set in B tree*/
498 if (si->value_len > OCFS2_XATTR_INLINE_SIZE) {
499 int new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
500 si->value_len);
501
502 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
503 new_clusters);
504 *want_clusters += new_clusters;
505 }
506 return ret;
507 }
508
509 int ocfs2_calc_xattr_init(struct inode *dir,
510 struct buffer_head *dir_bh,
511 int mode,
512 struct ocfs2_security_xattr_info *si,
513 int *want_clusters,
514 int *xattr_credits,
515 int *want_meta)
516 {
517 int ret = 0;
518 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
519 int s_size = 0, a_size = 0, acl_len = 0, new_clusters;
520
521 if (si->enable)
522 s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
523 si->value_len);
524
525 if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
526 acl_len = ocfs2_xattr_get_nolock(dir, dir_bh,
527 OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT,
528 "", NULL, 0);
529 if (acl_len > 0) {
530 a_size = ocfs2_xattr_entry_real_size(0, acl_len);
531 if (S_ISDIR(mode))
532 a_size <<= 1;
533 } else if (acl_len != 0 && acl_len != -ENODATA) {
534 mlog_errno(ret);
535 return ret;
536 }
537 }
538
539 if (!(s_size + a_size))
540 return ret;
541
542 /*
543 * The max space of security xattr taken inline is
544 * 256(name) + 80(value) + 16(entry) = 352 bytes,
545 * The max space of acl xattr taken inline is
546 * 80(value) + 16(entry) * 2(if directory) = 192 bytes,
547 * when blocksize = 512, may reserve one more cluser for
548 * xattr bucket, otherwise reserve one metadata block
549 * for them is ok.
550 * If this is a new directory with inline data,
551 * we choose to reserve the entire inline area for
552 * directory contents and force an external xattr block.
553 */
554 if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
555 (S_ISDIR(mode) && ocfs2_supports_inline_data(osb)) ||
556 (s_size + a_size) > OCFS2_XATTR_FREE_IN_IBODY) {
557 *want_meta = *want_meta + 1;
558 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
559 }
560
561 if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE &&
562 (s_size + a_size) > OCFS2_XATTR_FREE_IN_BLOCK(dir)) {
563 *want_clusters += 1;
564 *xattr_credits += ocfs2_blocks_per_xattr_bucket(dir->i_sb);
565 }
566
567 /*
568 * reserve credits and clusters for xattrs which has large value
569 * and have to be set outside
570 */
571 if (si->enable && si->value_len > OCFS2_XATTR_INLINE_SIZE) {
572 new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
573 si->value_len);
574 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
575 new_clusters);
576 *want_clusters += new_clusters;
577 }
578 if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL &&
579 acl_len > OCFS2_XATTR_INLINE_SIZE) {
580 /* for directory, it has DEFAULT and ACCESS two types of acls */
581 new_clusters = (S_ISDIR(mode) ? 2 : 1) *
582 ocfs2_clusters_for_bytes(dir->i_sb, acl_len);
583 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
584 new_clusters);
585 *want_clusters += new_clusters;
586 }
587
588 return ret;
589 }
590
591 static int ocfs2_xattr_extend_allocation(struct inode *inode,
592 u32 clusters_to_add,
593 struct ocfs2_xattr_value_buf *vb,
594 struct ocfs2_xattr_set_ctxt *ctxt)
595 {
596 int status = 0;
597 handle_t *handle = ctxt->handle;
598 enum ocfs2_alloc_restarted why;
599 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
600 u32 prev_clusters, logical_start = le32_to_cpu(vb->vb_xv->xr_clusters);
601 struct ocfs2_extent_tree et;
602
603 mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add);
604
605 ocfs2_init_xattr_value_extent_tree(&et, inode, vb);
606
607 status = vb->vb_access(handle, inode, vb->vb_bh,
608 OCFS2_JOURNAL_ACCESS_WRITE);
609 if (status < 0) {
610 mlog_errno(status);
611 goto leave;
612 }
613
614 prev_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
615 status = ocfs2_add_clusters_in_btree(osb,
616 inode,
617 &logical_start,
618 clusters_to_add,
619 0,
620 &et,
621 handle,
622 ctxt->data_ac,
623 ctxt->meta_ac,
624 &why);
625 if (status < 0) {
626 mlog_errno(status);
627 goto leave;
628 }
629
630 status = ocfs2_journal_dirty(handle, vb->vb_bh);
631 if (status < 0) {
632 mlog_errno(status);
633 goto leave;
634 }
635
636 clusters_to_add -= le32_to_cpu(vb->vb_xv->xr_clusters) - prev_clusters;
637
638 /*
639 * We should have already allocated enough space before the transaction,
640 * so no need to restart.
641 */
642 BUG_ON(why != RESTART_NONE || clusters_to_add);
643
644 leave:
645
646 return status;
647 }
648
649 static int __ocfs2_remove_xattr_range(struct inode *inode,
650 struct ocfs2_xattr_value_buf *vb,
651 u32 cpos, u32 phys_cpos, u32 len,
652 struct ocfs2_xattr_set_ctxt *ctxt)
653 {
654 int ret;
655 u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
656 handle_t *handle = ctxt->handle;
657 struct ocfs2_extent_tree et;
658
659 ocfs2_init_xattr_value_extent_tree(&et, inode, vb);
660
661 ret = vb->vb_access(handle, inode, vb->vb_bh,
662 OCFS2_JOURNAL_ACCESS_WRITE);
663 if (ret) {
664 mlog_errno(ret);
665 goto out;
666 }
667
668 ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, ctxt->meta_ac,
669 &ctxt->dealloc);
670 if (ret) {
671 mlog_errno(ret);
672 goto out;
673 }
674
675 le32_add_cpu(&vb->vb_xv->xr_clusters, -len);
676
677 ret = ocfs2_journal_dirty(handle, vb->vb_bh);
678 if (ret) {
679 mlog_errno(ret);
680 goto out;
681 }
682
683 ret = ocfs2_cache_cluster_dealloc(&ctxt->dealloc, phys_blkno, len);
684 if (ret)
685 mlog_errno(ret);
686
687 out:
688 return ret;
689 }
690
691 static int ocfs2_xattr_shrink_size(struct inode *inode,
692 u32 old_clusters,
693 u32 new_clusters,
694 struct ocfs2_xattr_value_buf *vb,
695 struct ocfs2_xattr_set_ctxt *ctxt)
696 {
697 int ret = 0;
698 u32 trunc_len, cpos, phys_cpos, alloc_size;
699 u64 block;
700
701 if (old_clusters <= new_clusters)
702 return 0;
703
704 cpos = new_clusters;
705 trunc_len = old_clusters - new_clusters;
706 while (trunc_len) {
707 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
708 &alloc_size,
709 &vb->vb_xv->xr_list);
710 if (ret) {
711 mlog_errno(ret);
712 goto out;
713 }
714
715 if (alloc_size > trunc_len)
716 alloc_size = trunc_len;
717
718 ret = __ocfs2_remove_xattr_range(inode, vb, cpos,
719 phys_cpos, alloc_size,
720 ctxt);
721 if (ret) {
722 mlog_errno(ret);
723 goto out;
724 }
725
726 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
727 ocfs2_remove_xattr_clusters_from_cache(inode, block,
728 alloc_size);
729 cpos += alloc_size;
730 trunc_len -= alloc_size;
731 }
732
733 out:
734 return ret;
735 }
736
737 static int ocfs2_xattr_value_truncate(struct inode *inode,
738 struct ocfs2_xattr_value_buf *vb,
739 int len,
740 struct ocfs2_xattr_set_ctxt *ctxt)
741 {
742 int ret;
743 u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
744 u32 old_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
745
746 if (new_clusters == old_clusters)
747 return 0;
748
749 if (new_clusters > old_clusters)
750 ret = ocfs2_xattr_extend_allocation(inode,
751 new_clusters - old_clusters,
752 vb, ctxt);
753 else
754 ret = ocfs2_xattr_shrink_size(inode,
755 old_clusters, new_clusters,
756 vb, ctxt);
757
758 return ret;
759 }
760
761 static int ocfs2_xattr_list_entry(char *buffer, size_t size,
762 size_t *result, const char *prefix,
763 const char *name, int name_len)
764 {
765 char *p = buffer + *result;
766 int prefix_len = strlen(prefix);
767 int total_len = prefix_len + name_len + 1;
768
769 *result += total_len;
770
771 /* we are just looking for how big our buffer needs to be */
772 if (!size)
773 return 0;
774
775 if (*result > size)
776 return -ERANGE;
777
778 memcpy(p, prefix, prefix_len);
779 memcpy(p + prefix_len, name, name_len);
780 p[prefix_len + name_len] = '\0';
781
782 return 0;
783 }
784
785 static int ocfs2_xattr_list_entries(struct inode *inode,
786 struct ocfs2_xattr_header *header,
787 char *buffer, size_t buffer_size)
788 {
789 size_t result = 0;
790 int i, type, ret;
791 const char *prefix, *name;
792
793 for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
794 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
795 type = ocfs2_xattr_get_type(entry);
796 prefix = ocfs2_xattr_prefix(type);
797
798 if (prefix) {
799 name = (const char *)header +
800 le16_to_cpu(entry->xe_name_offset);
801
802 ret = ocfs2_xattr_list_entry(buffer, buffer_size,
803 &result, prefix, name,
804 entry->xe_name_len);
805 if (ret)
806 return ret;
807 }
808 }
809
810 return result;
811 }
812
813 static int ocfs2_xattr_ibody_list(struct inode *inode,
814 struct ocfs2_dinode *di,
815 char *buffer,
816 size_t buffer_size)
817 {
818 struct ocfs2_xattr_header *header = NULL;
819 struct ocfs2_inode_info *oi = OCFS2_I(inode);
820 int ret = 0;
821
822 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
823 return ret;
824
825 header = (struct ocfs2_xattr_header *)
826 ((void *)di + inode->i_sb->s_blocksize -
827 le16_to_cpu(di->i_xattr_inline_size));
828
829 ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size);
830
831 return ret;
832 }
833
834 static int ocfs2_xattr_block_list(struct inode *inode,
835 struct ocfs2_dinode *di,
836 char *buffer,
837 size_t buffer_size)
838 {
839 struct buffer_head *blk_bh = NULL;
840 struct ocfs2_xattr_block *xb;
841 int ret = 0;
842
843 if (!di->i_xattr_loc)
844 return ret;
845
846 ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
847 &blk_bh);
848 if (ret < 0) {
849 mlog_errno(ret);
850 return ret;
851 }
852
853 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
854 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
855 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
856 ret = ocfs2_xattr_list_entries(inode, header,
857 buffer, buffer_size);
858 } else {
859 struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root;
860 ret = ocfs2_xattr_tree_list_index_block(inode, xt,
861 buffer, buffer_size);
862 }
863
864 brelse(blk_bh);
865
866 return ret;
867 }
868
869 ssize_t ocfs2_listxattr(struct dentry *dentry,
870 char *buffer,
871 size_t size)
872 {
873 int ret = 0, i_ret = 0, b_ret = 0;
874 struct buffer_head *di_bh = NULL;
875 struct ocfs2_dinode *di = NULL;
876 struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode);
877
878 if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
879 return -EOPNOTSUPP;
880
881 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
882 return ret;
883
884 ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0);
885 if (ret < 0) {
886 mlog_errno(ret);
887 return ret;
888 }
889
890 di = (struct ocfs2_dinode *)di_bh->b_data;
891
892 down_read(&oi->ip_xattr_sem);
893 i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size);
894 if (i_ret < 0)
895 b_ret = 0;
896 else {
897 if (buffer) {
898 buffer += i_ret;
899 size -= i_ret;
900 }
901 b_ret = ocfs2_xattr_block_list(dentry->d_inode, di,
902 buffer, size);
903 if (b_ret < 0)
904 i_ret = 0;
905 }
906 up_read(&oi->ip_xattr_sem);
907 ocfs2_inode_unlock(dentry->d_inode, 0);
908
909 brelse(di_bh);
910
911 return i_ret + b_ret;
912 }
913
914 static int ocfs2_xattr_find_entry(int name_index,
915 const char *name,
916 struct ocfs2_xattr_search *xs)
917 {
918 struct ocfs2_xattr_entry *entry;
919 size_t name_len;
920 int i, cmp = 1;
921
922 if (name == NULL)
923 return -EINVAL;
924
925 name_len = strlen(name);
926 entry = xs->here;
927 for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
928 cmp = name_index - ocfs2_xattr_get_type(entry);
929 if (!cmp)
930 cmp = name_len - entry->xe_name_len;
931 if (!cmp)
932 cmp = memcmp(name, (xs->base +
933 le16_to_cpu(entry->xe_name_offset)),
934 name_len);
935 if (cmp == 0)
936 break;
937 entry += 1;
938 }
939 xs->here = entry;
940
941 return cmp ? -ENODATA : 0;
942 }
943
944 static int ocfs2_xattr_get_value_outside(struct inode *inode,
945 struct ocfs2_xattr_value_root *xv,
946 void *buffer,
947 size_t len)
948 {
949 u32 cpos, p_cluster, num_clusters, bpc, clusters;
950 u64 blkno;
951 int i, ret = 0;
952 size_t cplen, blocksize;
953 struct buffer_head *bh = NULL;
954 struct ocfs2_extent_list *el;
955
956 el = &xv->xr_list;
957 clusters = le32_to_cpu(xv->xr_clusters);
958 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
959 blocksize = inode->i_sb->s_blocksize;
960
961 cpos = 0;
962 while (cpos < clusters) {
963 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
964 &num_clusters, el);
965 if (ret) {
966 mlog_errno(ret);
967 goto out;
968 }
969
970 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
971 /* Copy ocfs2_xattr_value */
972 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
973 ret = ocfs2_read_block(inode, blkno, &bh, NULL);
974 if (ret) {
975 mlog_errno(ret);
976 goto out;
977 }
978
979 cplen = len >= blocksize ? blocksize : len;
980 memcpy(buffer, bh->b_data, cplen);
981 len -= cplen;
982 buffer += cplen;
983
984 brelse(bh);
985 bh = NULL;
986 if (len == 0)
987 break;
988 }
989 cpos += num_clusters;
990 }
991 out:
992 return ret;
993 }
994
995 static int ocfs2_xattr_ibody_get(struct inode *inode,
996 int name_index,
997 const char *name,
998 void *buffer,
999 size_t buffer_size,
1000 struct ocfs2_xattr_search *xs)
1001 {
1002 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1003 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1004 struct ocfs2_xattr_value_root *xv;
1005 size_t size;
1006 int ret = 0;
1007
1008 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
1009 return -ENODATA;
1010
1011 xs->end = (void *)di + inode->i_sb->s_blocksize;
1012 xs->header = (struct ocfs2_xattr_header *)
1013 (xs->end - le16_to_cpu(di->i_xattr_inline_size));
1014 xs->base = (void *)xs->header;
1015 xs->here = xs->header->xh_entries;
1016
1017 ret = ocfs2_xattr_find_entry(name_index, name, xs);
1018 if (ret)
1019 return ret;
1020 size = le64_to_cpu(xs->here->xe_value_size);
1021 if (buffer) {
1022 if (size > buffer_size)
1023 return -ERANGE;
1024 if (ocfs2_xattr_is_local(xs->here)) {
1025 memcpy(buffer, (void *)xs->base +
1026 le16_to_cpu(xs->here->xe_name_offset) +
1027 OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
1028 } else {
1029 xv = (struct ocfs2_xattr_value_root *)
1030 (xs->base + le16_to_cpu(
1031 xs->here->xe_name_offset) +
1032 OCFS2_XATTR_SIZE(xs->here->xe_name_len));
1033 ret = ocfs2_xattr_get_value_outside(inode, xv,
1034 buffer, size);
1035 if (ret < 0) {
1036 mlog_errno(ret);
1037 return ret;
1038 }
1039 }
1040 }
1041
1042 return size;
1043 }
1044
1045 static int ocfs2_xattr_block_get(struct inode *inode,
1046 int name_index,
1047 const char *name,
1048 void *buffer,
1049 size_t buffer_size,
1050 struct ocfs2_xattr_search *xs)
1051 {
1052 struct ocfs2_xattr_block *xb;
1053 struct ocfs2_xattr_value_root *xv;
1054 size_t size;
1055 int ret = -ENODATA, name_offset, name_len, block_off, i;
1056
1057 xs->bucket = ocfs2_xattr_bucket_new(inode);
1058 if (!xs->bucket) {
1059 ret = -ENOMEM;
1060 mlog_errno(ret);
1061 goto cleanup;
1062 }
1063
1064 ret = ocfs2_xattr_block_find(inode, name_index, name, xs);
1065 if (ret) {
1066 mlog_errno(ret);
1067 goto cleanup;
1068 }
1069
1070 if (xs->not_found) {
1071 ret = -ENODATA;
1072 goto cleanup;
1073 }
1074
1075 xb = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1076 size = le64_to_cpu(xs->here->xe_value_size);
1077 if (buffer) {
1078 ret = -ERANGE;
1079 if (size > buffer_size)
1080 goto cleanup;
1081
1082 name_offset = le16_to_cpu(xs->here->xe_name_offset);
1083 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
1084 i = xs->here - xs->header->xh_entries;
1085
1086 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
1087 ret = ocfs2_xattr_bucket_get_name_value(inode,
1088 bucket_xh(xs->bucket),
1089 i,
1090 &block_off,
1091 &name_offset);
1092 xs->base = bucket_block(xs->bucket, block_off);
1093 }
1094 if (ocfs2_xattr_is_local(xs->here)) {
1095 memcpy(buffer, (void *)xs->base +
1096 name_offset + name_len, size);
1097 } else {
1098 xv = (struct ocfs2_xattr_value_root *)
1099 (xs->base + name_offset + name_len);
1100 ret = ocfs2_xattr_get_value_outside(inode, xv,
1101 buffer, size);
1102 if (ret < 0) {
1103 mlog_errno(ret);
1104 goto cleanup;
1105 }
1106 }
1107 }
1108 ret = size;
1109 cleanup:
1110 ocfs2_xattr_bucket_free(xs->bucket);
1111
1112 brelse(xs->xattr_bh);
1113 xs->xattr_bh = NULL;
1114 return ret;
1115 }
1116
1117 int ocfs2_xattr_get_nolock(struct inode *inode,
1118 struct buffer_head *di_bh,
1119 int name_index,
1120 const char *name,
1121 void *buffer,
1122 size_t buffer_size)
1123 {
1124 int ret;
1125 struct ocfs2_dinode *di = NULL;
1126 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1127 struct ocfs2_xattr_search xis = {
1128 .not_found = -ENODATA,
1129 };
1130 struct ocfs2_xattr_search xbs = {
1131 .not_found = -ENODATA,
1132 };
1133
1134 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1135 return -EOPNOTSUPP;
1136
1137 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1138 ret = -ENODATA;
1139
1140 xis.inode_bh = xbs.inode_bh = di_bh;
1141 di = (struct ocfs2_dinode *)di_bh->b_data;
1142
1143 down_read(&oi->ip_xattr_sem);
1144 ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
1145 buffer_size, &xis);
1146 if (ret == -ENODATA && di->i_xattr_loc)
1147 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
1148 buffer_size, &xbs);
1149 up_read(&oi->ip_xattr_sem);
1150
1151 return ret;
1152 }
1153
1154 /* ocfs2_xattr_get()
1155 *
1156 * Copy an extended attribute into the buffer provided.
1157 * Buffer is NULL to compute the size of buffer required.
1158 */
1159 static int ocfs2_xattr_get(struct inode *inode,
1160 int name_index,
1161 const char *name,
1162 void *buffer,
1163 size_t buffer_size)
1164 {
1165 int ret;
1166 struct buffer_head *di_bh = NULL;
1167
1168 ret = ocfs2_inode_lock(inode, &di_bh, 0);
1169 if (ret < 0) {
1170 mlog_errno(ret);
1171 return ret;
1172 }
1173 ret = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
1174 name, buffer, buffer_size);
1175
1176 ocfs2_inode_unlock(inode, 0);
1177
1178 brelse(di_bh);
1179
1180 return ret;
1181 }
1182
1183 static int __ocfs2_xattr_set_value_outside(struct inode *inode,
1184 handle_t *handle,
1185 struct ocfs2_xattr_value_root *xv,
1186 const void *value,
1187 int value_len)
1188 {
1189 int ret = 0, i, cp_len;
1190 u16 blocksize = inode->i_sb->s_blocksize;
1191 u32 p_cluster, num_clusters;
1192 u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1193 u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
1194 u64 blkno;
1195 struct buffer_head *bh = NULL;
1196
1197 BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
1198
1199 while (cpos < clusters) {
1200 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
1201 &num_clusters, &xv->xr_list);
1202 if (ret) {
1203 mlog_errno(ret);
1204 goto out;
1205 }
1206
1207 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
1208
1209 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1210 ret = ocfs2_read_block(inode, blkno, &bh, NULL);
1211 if (ret) {
1212 mlog_errno(ret);
1213 goto out;
1214 }
1215
1216 ret = ocfs2_journal_access(handle,
1217 inode,
1218 bh,
1219 OCFS2_JOURNAL_ACCESS_WRITE);
1220 if (ret < 0) {
1221 mlog_errno(ret);
1222 goto out;
1223 }
1224
1225 cp_len = value_len > blocksize ? blocksize : value_len;
1226 memcpy(bh->b_data, value, cp_len);
1227 value_len -= cp_len;
1228 value += cp_len;
1229 if (cp_len < blocksize)
1230 memset(bh->b_data + cp_len, 0,
1231 blocksize - cp_len);
1232
1233 ret = ocfs2_journal_dirty(handle, bh);
1234 if (ret < 0) {
1235 mlog_errno(ret);
1236 goto out;
1237 }
1238 brelse(bh);
1239 bh = NULL;
1240
1241 /*
1242 * XXX: do we need to empty all the following
1243 * blocks in this cluster?
1244 */
1245 if (!value_len)
1246 break;
1247 }
1248 cpos += num_clusters;
1249 }
1250 out:
1251 brelse(bh);
1252
1253 return ret;
1254 }
1255
1256 static int ocfs2_xattr_cleanup(struct inode *inode,
1257 handle_t *handle,
1258 struct ocfs2_xattr_info *xi,
1259 struct ocfs2_xattr_search *xs,
1260 struct ocfs2_xattr_value_buf *vb,
1261 size_t offs)
1262 {
1263 int ret = 0;
1264 size_t name_len = strlen(xi->name);
1265 void *val = xs->base + offs;
1266 size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1267
1268 ret = vb->vb_access(handle, inode, vb->vb_bh,
1269 OCFS2_JOURNAL_ACCESS_WRITE);
1270 if (ret) {
1271 mlog_errno(ret);
1272 goto out;
1273 }
1274 /* Decrease xattr count */
1275 le16_add_cpu(&xs->header->xh_count, -1);
1276 /* Remove the xattr entry and tree root which has already be set*/
1277 memset((void *)xs->here, 0, sizeof(struct ocfs2_xattr_entry));
1278 memset(val, 0, size);
1279
1280 ret = ocfs2_journal_dirty(handle, vb->vb_bh);
1281 if (ret < 0)
1282 mlog_errno(ret);
1283 out:
1284 return ret;
1285 }
1286
1287 static int ocfs2_xattr_update_entry(struct inode *inode,
1288 handle_t *handle,
1289 struct ocfs2_xattr_info *xi,
1290 struct ocfs2_xattr_search *xs,
1291 struct ocfs2_xattr_value_buf *vb,
1292 size_t offs)
1293 {
1294 int ret;
1295
1296 ret = vb->vb_access(handle, inode, vb->vb_bh,
1297 OCFS2_JOURNAL_ACCESS_WRITE);
1298 if (ret) {
1299 mlog_errno(ret);
1300 goto out;
1301 }
1302
1303 xs->here->xe_name_offset = cpu_to_le16(offs);
1304 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1305 if (xi->value_len <= OCFS2_XATTR_INLINE_SIZE)
1306 ocfs2_xattr_set_local(xs->here, 1);
1307 else
1308 ocfs2_xattr_set_local(xs->here, 0);
1309 ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1310
1311 ret = ocfs2_journal_dirty(handle, vb->vb_bh);
1312 if (ret < 0)
1313 mlog_errno(ret);
1314 out:
1315 return ret;
1316 }
1317
1318 /*
1319 * ocfs2_xattr_set_value_outside()
1320 *
1321 * Set large size value in B tree.
1322 */
1323 static int ocfs2_xattr_set_value_outside(struct inode *inode,
1324 struct ocfs2_xattr_info *xi,
1325 struct ocfs2_xattr_search *xs,
1326 struct ocfs2_xattr_set_ctxt *ctxt,
1327 struct ocfs2_xattr_value_buf *vb,
1328 size_t offs)
1329 {
1330 size_t name_len = strlen(xi->name);
1331 void *val = xs->base + offs;
1332 struct ocfs2_xattr_value_root *xv = NULL;
1333 size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1334 int ret = 0;
1335
1336 memset(val, 0, size);
1337 memcpy(val, xi->name, name_len);
1338 xv = (struct ocfs2_xattr_value_root *)
1339 (val + OCFS2_XATTR_SIZE(name_len));
1340 xv->xr_clusters = 0;
1341 xv->xr_last_eb_blk = 0;
1342 xv->xr_list.l_tree_depth = 0;
1343 xv->xr_list.l_count = cpu_to_le16(1);
1344 xv->xr_list.l_next_free_rec = 0;
1345 vb->vb_xv = xv;
1346
1347 ret = ocfs2_xattr_value_truncate(inode, vb, xi->value_len, ctxt);
1348 if (ret < 0) {
1349 mlog_errno(ret);
1350 return ret;
1351 }
1352 ret = ocfs2_xattr_update_entry(inode, ctxt->handle, xi, xs, vb, offs);
1353 if (ret < 0) {
1354 mlog_errno(ret);
1355 return ret;
1356 }
1357 ret = __ocfs2_xattr_set_value_outside(inode, ctxt->handle, vb->vb_xv,
1358 xi->value, xi->value_len);
1359 if (ret < 0)
1360 mlog_errno(ret);
1361
1362 return ret;
1363 }
1364
1365 /*
1366 * ocfs2_xattr_set_entry_local()
1367 *
1368 * Set, replace or remove extended attribute in local.
1369 */
1370 static void ocfs2_xattr_set_entry_local(struct inode *inode,
1371 struct ocfs2_xattr_info *xi,
1372 struct ocfs2_xattr_search *xs,
1373 struct ocfs2_xattr_entry *last,
1374 size_t min_offs)
1375 {
1376 size_t name_len = strlen(xi->name);
1377 int i;
1378
1379 if (xi->value && xs->not_found) {
1380 /* Insert the new xattr entry. */
1381 le16_add_cpu(&xs->header->xh_count, 1);
1382 ocfs2_xattr_set_type(last, xi->name_index);
1383 ocfs2_xattr_set_local(last, 1);
1384 last->xe_name_len = name_len;
1385 } else {
1386 void *first_val;
1387 void *val;
1388 size_t offs, size;
1389
1390 first_val = xs->base + min_offs;
1391 offs = le16_to_cpu(xs->here->xe_name_offset);
1392 val = xs->base + offs;
1393
1394 if (le64_to_cpu(xs->here->xe_value_size) >
1395 OCFS2_XATTR_INLINE_SIZE)
1396 size = OCFS2_XATTR_SIZE(name_len) +
1397 OCFS2_XATTR_ROOT_SIZE;
1398 else
1399 size = OCFS2_XATTR_SIZE(name_len) +
1400 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1401
1402 if (xi->value && size == OCFS2_XATTR_SIZE(name_len) +
1403 OCFS2_XATTR_SIZE(xi->value_len)) {
1404 /* The old and the new value have the
1405 same size. Just replace the value. */
1406 ocfs2_xattr_set_local(xs->here, 1);
1407 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1408 /* Clear value bytes. */
1409 memset(val + OCFS2_XATTR_SIZE(name_len),
1410 0,
1411 OCFS2_XATTR_SIZE(xi->value_len));
1412 memcpy(val + OCFS2_XATTR_SIZE(name_len),
1413 xi->value,
1414 xi->value_len);
1415 return;
1416 }
1417 /* Remove the old name+value. */
1418 memmove(first_val + size, first_val, val - first_val);
1419 memset(first_val, 0, size);
1420 xs->here->xe_name_hash = 0;
1421 xs->here->xe_name_offset = 0;
1422 ocfs2_xattr_set_local(xs->here, 1);
1423 xs->here->xe_value_size = 0;
1424
1425 min_offs += size;
1426
1427 /* Adjust all value offsets. */
1428 last = xs->header->xh_entries;
1429 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1430 size_t o = le16_to_cpu(last->xe_name_offset);
1431
1432 if (o < offs)
1433 last->xe_name_offset = cpu_to_le16(o + size);
1434 last += 1;
1435 }
1436
1437 if (!xi->value) {
1438 /* Remove the old entry. */
1439 last -= 1;
1440 memmove(xs->here, xs->here + 1,
1441 (void *)last - (void *)xs->here);
1442 memset(last, 0, sizeof(struct ocfs2_xattr_entry));
1443 le16_add_cpu(&xs->header->xh_count, -1);
1444 }
1445 }
1446 if (xi->value) {
1447 /* Insert the new name+value. */
1448 size_t size = OCFS2_XATTR_SIZE(name_len) +
1449 OCFS2_XATTR_SIZE(xi->value_len);
1450 void *val = xs->base + min_offs - size;
1451
1452 xs->here->xe_name_offset = cpu_to_le16(min_offs - size);
1453 memset(val, 0, size);
1454 memcpy(val, xi->name, name_len);
1455 memcpy(val + OCFS2_XATTR_SIZE(name_len),
1456 xi->value,
1457 xi->value_len);
1458 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1459 ocfs2_xattr_set_local(xs->here, 1);
1460 ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1461 }
1462
1463 return;
1464 }
1465
1466 /*
1467 * ocfs2_xattr_set_entry()
1468 *
1469 * Set extended attribute entry into inode or block.
1470 *
1471 * If extended attribute value size > OCFS2_XATTR_INLINE_SIZE,
1472 * We first insert tree root(ocfs2_xattr_value_root) with set_entry_local(),
1473 * then set value in B tree with set_value_outside().
1474 */
1475 static int ocfs2_xattr_set_entry(struct inode *inode,
1476 struct ocfs2_xattr_info *xi,
1477 struct ocfs2_xattr_search *xs,
1478 struct ocfs2_xattr_set_ctxt *ctxt,
1479 int flag)
1480 {
1481 struct ocfs2_xattr_entry *last;
1482 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1483 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1484 size_t min_offs = xs->end - xs->base, name_len = strlen(xi->name);
1485 size_t size_l = 0;
1486 handle_t *handle = ctxt->handle;
1487 int free, i, ret;
1488 struct ocfs2_xattr_info xi_l = {
1489 .name_index = xi->name_index,
1490 .name = xi->name,
1491 .value = xi->value,
1492 .value_len = xi->value_len,
1493 };
1494 struct ocfs2_xattr_value_buf vb = {
1495 .vb_bh = xs->xattr_bh,
1496 .vb_access = ocfs2_journal_access_di,
1497 };
1498
1499 if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1500 BUG_ON(xs->xattr_bh == xs->inode_bh);
1501 vb.vb_access = ocfs2_journal_access_xb;
1502 } else
1503 BUG_ON(xs->xattr_bh != xs->inode_bh);
1504
1505 /* Compute min_offs, last and free space. */
1506 last = xs->header->xh_entries;
1507
1508 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1509 size_t offs = le16_to_cpu(last->xe_name_offset);
1510 if (offs < min_offs)
1511 min_offs = offs;
1512 last += 1;
1513 }
1514
1515 free = min_offs - ((void *)last - xs->base) - OCFS2_XATTR_HEADER_GAP;
1516 if (free < 0)
1517 return -EIO;
1518
1519 if (!xs->not_found) {
1520 size_t size = 0;
1521 if (ocfs2_xattr_is_local(xs->here))
1522 size = OCFS2_XATTR_SIZE(name_len) +
1523 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1524 else
1525 size = OCFS2_XATTR_SIZE(name_len) +
1526 OCFS2_XATTR_ROOT_SIZE;
1527 free += (size + sizeof(struct ocfs2_xattr_entry));
1528 }
1529 /* Check free space in inode or block */
1530 if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1531 if (free < sizeof(struct ocfs2_xattr_entry) +
1532 OCFS2_XATTR_SIZE(name_len) +
1533 OCFS2_XATTR_ROOT_SIZE) {
1534 ret = -ENOSPC;
1535 goto out;
1536 }
1537 size_l = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1538 xi_l.value = (void *)&def_xv;
1539 xi_l.value_len = OCFS2_XATTR_ROOT_SIZE;
1540 } else if (xi->value) {
1541 if (free < sizeof(struct ocfs2_xattr_entry) +
1542 OCFS2_XATTR_SIZE(name_len) +
1543 OCFS2_XATTR_SIZE(xi->value_len)) {
1544 ret = -ENOSPC;
1545 goto out;
1546 }
1547 }
1548
1549 if (!xs->not_found) {
1550 /* For existing extended attribute */
1551 size_t size = OCFS2_XATTR_SIZE(name_len) +
1552 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1553 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1554 void *val = xs->base + offs;
1555
1556 if (ocfs2_xattr_is_local(xs->here) && size == size_l) {
1557 /* Replace existing local xattr with tree root */
1558 ret = ocfs2_xattr_set_value_outside(inode, xi, xs,
1559 ctxt, &vb, offs);
1560 if (ret < 0)
1561 mlog_errno(ret);
1562 goto out;
1563 } else if (!ocfs2_xattr_is_local(xs->here)) {
1564 /* For existing xattr which has value outside */
1565 vb.vb_xv = (struct ocfs2_xattr_value_root *)
1566 (val + OCFS2_XATTR_SIZE(name_len));
1567
1568 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1569 /*
1570 * If new value need set outside also,
1571 * first truncate old value to new value,
1572 * then set new value with set_value_outside().
1573 */
1574 ret = ocfs2_xattr_value_truncate(inode,
1575 &vb,
1576 xi->value_len,
1577 ctxt);
1578 if (ret < 0) {
1579 mlog_errno(ret);
1580 goto out;
1581 }
1582
1583 ret = ocfs2_xattr_update_entry(inode,
1584 handle,
1585 xi,
1586 xs,
1587 &vb,
1588 offs);
1589 if (ret < 0) {
1590 mlog_errno(ret);
1591 goto out;
1592 }
1593
1594 ret = __ocfs2_xattr_set_value_outside(inode,
1595 handle,
1596 vb.vb_xv,
1597 xi->value,
1598 xi->value_len);
1599 if (ret < 0)
1600 mlog_errno(ret);
1601 goto out;
1602 } else {
1603 /*
1604 * If new value need set in local,
1605 * just trucate old value to zero.
1606 */
1607 ret = ocfs2_xattr_value_truncate(inode,
1608 &vb,
1609 0,
1610 ctxt);
1611 if (ret < 0)
1612 mlog_errno(ret);
1613 }
1614 }
1615 }
1616
1617 ret = ocfs2_journal_access_di(handle, inode, xs->inode_bh,
1618 OCFS2_JOURNAL_ACCESS_WRITE);
1619 if (ret) {
1620 mlog_errno(ret);
1621 goto out;
1622 }
1623
1624 if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1625 ret = vb.vb_access(handle, inode, vb.vb_bh,
1626 OCFS2_JOURNAL_ACCESS_WRITE);
1627 if (ret) {
1628 mlog_errno(ret);
1629 goto out;
1630 }
1631 }
1632
1633 /*
1634 * Set value in local, include set tree root in local.
1635 * This is the first step for value size >INLINE_SIZE.
1636 */
1637 ocfs2_xattr_set_entry_local(inode, &xi_l, xs, last, min_offs);
1638
1639 if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1640 ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
1641 if (ret < 0) {
1642 mlog_errno(ret);
1643 goto out;
1644 }
1645 }
1646
1647 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) &&
1648 (flag & OCFS2_INLINE_XATTR_FL)) {
1649 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1650 unsigned int xattrsize = osb->s_xattr_inline_size;
1651
1652 /*
1653 * Adjust extent record count or inline data size
1654 * to reserve space for extended attribute.
1655 */
1656 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1657 struct ocfs2_inline_data *idata = &di->id2.i_data;
1658 le16_add_cpu(&idata->id_count, -xattrsize);
1659 } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
1660 struct ocfs2_extent_list *el = &di->id2.i_list;
1661 le16_add_cpu(&el->l_count, -(xattrsize /
1662 sizeof(struct ocfs2_extent_rec)));
1663 }
1664 di->i_xattr_inline_size = cpu_to_le16(xattrsize);
1665 }
1666 /* Update xattr flag */
1667 spin_lock(&oi->ip_lock);
1668 oi->ip_dyn_features |= flag;
1669 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1670 spin_unlock(&oi->ip_lock);
1671
1672 ret = ocfs2_journal_dirty(handle, xs->inode_bh);
1673 if (ret < 0)
1674 mlog_errno(ret);
1675
1676 if (!ret && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1677 /*
1678 * Set value outside in B tree.
1679 * This is the second step for value size > INLINE_SIZE.
1680 */
1681 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1682 ret = ocfs2_xattr_set_value_outside(inode, xi, xs, ctxt,
1683 &vb, offs);
1684 if (ret < 0) {
1685 int ret2;
1686
1687 mlog_errno(ret);
1688 /*
1689 * If set value outside failed, we have to clean
1690 * the junk tree root we have already set in local.
1691 */
1692 ret2 = ocfs2_xattr_cleanup(inode, ctxt->handle,
1693 xi, xs, &vb, offs);
1694 if (ret2 < 0)
1695 mlog_errno(ret2);
1696 }
1697 }
1698 out:
1699 return ret;
1700 }
1701
1702 static int ocfs2_remove_value_outside(struct inode*inode,
1703 struct ocfs2_xattr_value_buf *vb,
1704 struct ocfs2_xattr_header *header)
1705 {
1706 int ret = 0, i;
1707 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1708 struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
1709
1710 ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
1711
1712 ctxt.handle = ocfs2_start_trans(osb,
1713 ocfs2_remove_extent_credits(osb->sb));
1714 if (IS_ERR(ctxt.handle)) {
1715 ret = PTR_ERR(ctxt.handle);
1716 mlog_errno(ret);
1717 goto out;
1718 }
1719
1720 for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
1721 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
1722
1723 if (!ocfs2_xattr_is_local(entry)) {
1724 void *val;
1725
1726 val = (void *)header +
1727 le16_to_cpu(entry->xe_name_offset);
1728 vb->vb_xv = (struct ocfs2_xattr_value_root *)
1729 (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
1730 ret = ocfs2_xattr_value_truncate(inode, vb, 0, &ctxt);
1731 if (ret < 0) {
1732 mlog_errno(ret);
1733 break;
1734 }
1735 }
1736 }
1737
1738 ocfs2_commit_trans(osb, ctxt.handle);
1739 ocfs2_schedule_truncate_log_flush(osb, 1);
1740 ocfs2_run_deallocs(osb, &ctxt.dealloc);
1741 out:
1742 return ret;
1743 }
1744
1745 static int ocfs2_xattr_ibody_remove(struct inode *inode,
1746 struct buffer_head *di_bh)
1747 {
1748
1749 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1750 struct ocfs2_xattr_header *header;
1751 int ret;
1752 struct ocfs2_xattr_value_buf vb = {
1753 .vb_bh = di_bh,
1754 .vb_access = ocfs2_journal_access_di,
1755 };
1756
1757 header = (struct ocfs2_xattr_header *)
1758 ((void *)di + inode->i_sb->s_blocksize -
1759 le16_to_cpu(di->i_xattr_inline_size));
1760
1761 ret = ocfs2_remove_value_outside(inode, &vb, header);
1762
1763 return ret;
1764 }
1765
1766 static int ocfs2_xattr_block_remove(struct inode *inode,
1767 struct buffer_head *blk_bh)
1768 {
1769 struct ocfs2_xattr_block *xb;
1770 int ret = 0;
1771 struct ocfs2_xattr_value_buf vb = {
1772 .vb_bh = blk_bh,
1773 .vb_access = ocfs2_journal_access_xb,
1774 };
1775
1776 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1777 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
1778 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
1779 ret = ocfs2_remove_value_outside(inode, &vb, header);
1780 } else
1781 ret = ocfs2_delete_xattr_index_block(inode, blk_bh);
1782
1783 return ret;
1784 }
1785
1786 static int ocfs2_xattr_free_block(struct inode *inode,
1787 u64 block)
1788 {
1789 struct inode *xb_alloc_inode;
1790 struct buffer_head *xb_alloc_bh = NULL;
1791 struct buffer_head *blk_bh = NULL;
1792 struct ocfs2_xattr_block *xb;
1793 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1794 handle_t *handle;
1795 int ret = 0;
1796 u64 blk, bg_blkno;
1797 u16 bit;
1798
1799 ret = ocfs2_read_xattr_block(inode, block, &blk_bh);
1800 if (ret < 0) {
1801 mlog_errno(ret);
1802 goto out;
1803 }
1804
1805 ret = ocfs2_xattr_block_remove(inode, blk_bh);
1806 if (ret < 0) {
1807 mlog_errno(ret);
1808 goto out;
1809 }
1810
1811 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1812 blk = le64_to_cpu(xb->xb_blkno);
1813 bit = le16_to_cpu(xb->xb_suballoc_bit);
1814 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
1815
1816 xb_alloc_inode = ocfs2_get_system_file_inode(osb,
1817 EXTENT_ALLOC_SYSTEM_INODE,
1818 le16_to_cpu(xb->xb_suballoc_slot));
1819 if (!xb_alloc_inode) {
1820 ret = -ENOMEM;
1821 mlog_errno(ret);
1822 goto out;
1823 }
1824 mutex_lock(&xb_alloc_inode->i_mutex);
1825
1826 ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
1827 if (ret < 0) {
1828 mlog_errno(ret);
1829 goto out_mutex;
1830 }
1831
1832 handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
1833 if (IS_ERR(handle)) {
1834 ret = PTR_ERR(handle);
1835 mlog_errno(ret);
1836 goto out_unlock;
1837 }
1838
1839 ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
1840 bit, bg_blkno, 1);
1841 if (ret < 0)
1842 mlog_errno(ret);
1843
1844 ocfs2_commit_trans(osb, handle);
1845 out_unlock:
1846 ocfs2_inode_unlock(xb_alloc_inode, 1);
1847 brelse(xb_alloc_bh);
1848 out_mutex:
1849 mutex_unlock(&xb_alloc_inode->i_mutex);
1850 iput(xb_alloc_inode);
1851 out:
1852 brelse(blk_bh);
1853 return ret;
1854 }
1855
1856 /*
1857 * ocfs2_xattr_remove()
1858 *
1859 * Free extended attribute resources associated with this inode.
1860 */
1861 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
1862 {
1863 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1864 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1865 handle_t *handle;
1866 int ret;
1867
1868 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1869 return 0;
1870
1871 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1872 return 0;
1873
1874 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
1875 ret = ocfs2_xattr_ibody_remove(inode, di_bh);
1876 if (ret < 0) {
1877 mlog_errno(ret);
1878 goto out;
1879 }
1880 }
1881
1882 if (di->i_xattr_loc) {
1883 ret = ocfs2_xattr_free_block(inode,
1884 le64_to_cpu(di->i_xattr_loc));
1885 if (ret < 0) {
1886 mlog_errno(ret);
1887 goto out;
1888 }
1889 }
1890
1891 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1892 OCFS2_INODE_UPDATE_CREDITS);
1893 if (IS_ERR(handle)) {
1894 ret = PTR_ERR(handle);
1895 mlog_errno(ret);
1896 goto out;
1897 }
1898 ret = ocfs2_journal_access_di(handle, inode, di_bh,
1899 OCFS2_JOURNAL_ACCESS_WRITE);
1900 if (ret) {
1901 mlog_errno(ret);
1902 goto out_commit;
1903 }
1904
1905 di->i_xattr_loc = 0;
1906
1907 spin_lock(&oi->ip_lock);
1908 oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
1909 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1910 spin_unlock(&oi->ip_lock);
1911
1912 ret = ocfs2_journal_dirty(handle, di_bh);
1913 if (ret < 0)
1914 mlog_errno(ret);
1915 out_commit:
1916 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1917 out:
1918 return ret;
1919 }
1920
1921 static int ocfs2_xattr_has_space_inline(struct inode *inode,
1922 struct ocfs2_dinode *di)
1923 {
1924 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1925 unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
1926 int free;
1927
1928 if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
1929 return 0;
1930
1931 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1932 struct ocfs2_inline_data *idata = &di->id2.i_data;
1933 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
1934 } else if (ocfs2_inode_is_fast_symlink(inode)) {
1935 free = ocfs2_fast_symlink_chars(inode->i_sb) -
1936 le64_to_cpu(di->i_size);
1937 } else {
1938 struct ocfs2_extent_list *el = &di->id2.i_list;
1939 free = (le16_to_cpu(el->l_count) -
1940 le16_to_cpu(el->l_next_free_rec)) *
1941 sizeof(struct ocfs2_extent_rec);
1942 }
1943 if (free >= xattrsize)
1944 return 1;
1945
1946 return 0;
1947 }
1948
1949 /*
1950 * ocfs2_xattr_ibody_find()
1951 *
1952 * Find extended attribute in inode block and
1953 * fill search info into struct ocfs2_xattr_search.
1954 */
1955 static int ocfs2_xattr_ibody_find(struct inode *inode,
1956 int name_index,
1957 const char *name,
1958 struct ocfs2_xattr_search *xs)
1959 {
1960 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1961 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1962 int ret;
1963 int has_space = 0;
1964
1965 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
1966 return 0;
1967
1968 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
1969 down_read(&oi->ip_alloc_sem);
1970 has_space = ocfs2_xattr_has_space_inline(inode, di);
1971 up_read(&oi->ip_alloc_sem);
1972 if (!has_space)
1973 return 0;
1974 }
1975
1976 xs->xattr_bh = xs->inode_bh;
1977 xs->end = (void *)di + inode->i_sb->s_blocksize;
1978 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
1979 xs->header = (struct ocfs2_xattr_header *)
1980 (xs->end - le16_to_cpu(di->i_xattr_inline_size));
1981 else
1982 xs->header = (struct ocfs2_xattr_header *)
1983 (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
1984 xs->base = (void *)xs->header;
1985 xs->here = xs->header->xh_entries;
1986
1987 /* Find the named attribute. */
1988 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
1989 ret = ocfs2_xattr_find_entry(name_index, name, xs);
1990 if (ret && ret != -ENODATA)
1991 return ret;
1992 xs->not_found = ret;
1993 }
1994
1995 return 0;
1996 }
1997
1998 /*
1999 * ocfs2_xattr_ibody_set()
2000 *
2001 * Set, replace or remove an extended attribute into inode block.
2002 *
2003 */
2004 static int ocfs2_xattr_ibody_set(struct inode *inode,
2005 struct ocfs2_xattr_info *xi,
2006 struct ocfs2_xattr_search *xs,
2007 struct ocfs2_xattr_set_ctxt *ctxt)
2008 {
2009 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2010 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2011 int ret;
2012
2013 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2014 return -ENOSPC;
2015
2016 down_write(&oi->ip_alloc_sem);
2017 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2018 if (!ocfs2_xattr_has_space_inline(inode, di)) {
2019 ret = -ENOSPC;
2020 goto out;
2021 }
2022 }
2023
2024 ret = ocfs2_xattr_set_entry(inode, xi, xs, ctxt,
2025 (OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL));
2026 out:
2027 up_write(&oi->ip_alloc_sem);
2028
2029 return ret;
2030 }
2031
2032 /*
2033 * ocfs2_xattr_block_find()
2034 *
2035 * Find extended attribute in external block and
2036 * fill search info into struct ocfs2_xattr_search.
2037 */
2038 static int ocfs2_xattr_block_find(struct inode *inode,
2039 int name_index,
2040 const char *name,
2041 struct ocfs2_xattr_search *xs)
2042 {
2043 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2044 struct buffer_head *blk_bh = NULL;
2045 struct ocfs2_xattr_block *xb;
2046 int ret = 0;
2047
2048 if (!di->i_xattr_loc)
2049 return ret;
2050
2051 ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
2052 &blk_bh);
2053 if (ret < 0) {
2054 mlog_errno(ret);
2055 return ret;
2056 }
2057
2058 xs->xattr_bh = blk_bh;
2059 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2060
2061 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2062 xs->header = &xb->xb_attrs.xb_header;
2063 xs->base = (void *)xs->header;
2064 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
2065 xs->here = xs->header->xh_entries;
2066
2067 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2068 } else
2069 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
2070 name_index,
2071 name, xs);
2072
2073 if (ret && ret != -ENODATA) {
2074 xs->xattr_bh = NULL;
2075 goto cleanup;
2076 }
2077 xs->not_found = ret;
2078 return 0;
2079 cleanup:
2080 brelse(blk_bh);
2081
2082 return ret;
2083 }
2084
2085 /*
2086 * ocfs2_xattr_block_set()
2087 *
2088 * Set, replace or remove an extended attribute into external block.
2089 *
2090 */
2091 static int ocfs2_xattr_block_set(struct inode *inode,
2092 struct ocfs2_xattr_info *xi,
2093 struct ocfs2_xattr_search *xs,
2094 struct ocfs2_xattr_set_ctxt *ctxt)
2095 {
2096 struct buffer_head *new_bh = NULL;
2097 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2098 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2099 handle_t *handle = ctxt->handle;
2100 struct ocfs2_xattr_block *xblk = NULL;
2101 u16 suballoc_bit_start;
2102 u32 num_got;
2103 u64 first_blkno;
2104 int ret;
2105
2106 if (!xs->xattr_bh) {
2107 ret = ocfs2_journal_access_di(handle, inode, xs->inode_bh,
2108 OCFS2_JOURNAL_ACCESS_CREATE);
2109 if (ret < 0) {
2110 mlog_errno(ret);
2111 goto end;
2112 }
2113
2114 ret = ocfs2_claim_metadata(osb, handle, ctxt->meta_ac, 1,
2115 &suballoc_bit_start, &num_got,
2116 &first_blkno);
2117 if (ret < 0) {
2118 mlog_errno(ret);
2119 goto end;
2120 }
2121
2122 new_bh = sb_getblk(inode->i_sb, first_blkno);
2123 ocfs2_set_new_buffer_uptodate(inode, new_bh);
2124
2125 ret = ocfs2_journal_access_xb(handle, inode, new_bh,
2126 OCFS2_JOURNAL_ACCESS_CREATE);
2127 if (ret < 0) {
2128 mlog_errno(ret);
2129 goto end;
2130 }
2131
2132 /* Initialize ocfs2_xattr_block */
2133 xs->xattr_bh = new_bh;
2134 xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
2135 memset(xblk, 0, inode->i_sb->s_blocksize);
2136 strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
2137 xblk->xb_suballoc_slot = cpu_to_le16(osb->slot_num);
2138 xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
2139 xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation);
2140 xblk->xb_blkno = cpu_to_le64(first_blkno);
2141
2142 xs->header = &xblk->xb_attrs.xb_header;
2143 xs->base = (void *)xs->header;
2144 xs->end = (void *)xblk + inode->i_sb->s_blocksize;
2145 xs->here = xs->header->xh_entries;
2146
2147 ret = ocfs2_journal_dirty(handle, new_bh);
2148 if (ret < 0) {
2149 mlog_errno(ret);
2150 goto end;
2151 }
2152 di->i_xattr_loc = cpu_to_le64(first_blkno);
2153 ocfs2_journal_dirty(handle, xs->inode_bh);
2154 } else
2155 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2156
2157 if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
2158 /* Set extended attribute into external block */
2159 ret = ocfs2_xattr_set_entry(inode, xi, xs, ctxt,
2160 OCFS2_HAS_XATTR_FL);
2161 if (!ret || ret != -ENOSPC)
2162 goto end;
2163
2164 ret = ocfs2_xattr_create_index_block(inode, xs, ctxt);
2165 if (ret)
2166 goto end;
2167 }
2168
2169 ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs, ctxt);
2170
2171 end:
2172
2173 return ret;
2174 }
2175
2176 /* Check whether the new xattr can be inserted into the inode. */
2177 static int ocfs2_xattr_can_be_in_inode(struct inode *inode,
2178 struct ocfs2_xattr_info *xi,
2179 struct ocfs2_xattr_search *xs)
2180 {
2181 u64 value_size;
2182 struct ocfs2_xattr_entry *last;
2183 int free, i;
2184 size_t min_offs = xs->end - xs->base;
2185
2186 if (!xs->header)
2187 return 0;
2188
2189 last = xs->header->xh_entries;
2190
2191 for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
2192 size_t offs = le16_to_cpu(last->xe_name_offset);
2193 if (offs < min_offs)
2194 min_offs = offs;
2195 last += 1;
2196 }
2197
2198 free = min_offs - ((void *)last - xs->base) - OCFS2_XATTR_HEADER_GAP;
2199 if (free < 0)
2200 return 0;
2201
2202 BUG_ON(!xs->not_found);
2203
2204 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
2205 value_size = OCFS2_XATTR_ROOT_SIZE;
2206 else
2207 value_size = OCFS2_XATTR_SIZE(xi->value_len);
2208
2209 if (free >= sizeof(struct ocfs2_xattr_entry) +
2210 OCFS2_XATTR_SIZE(strlen(xi->name)) + value_size)
2211 return 1;
2212
2213 return 0;
2214 }
2215
2216 static int ocfs2_calc_xattr_set_need(struct inode *inode,
2217 struct ocfs2_dinode *di,
2218 struct ocfs2_xattr_info *xi,
2219 struct ocfs2_xattr_search *xis,
2220 struct ocfs2_xattr_search *xbs,
2221 int *clusters_need,
2222 int *meta_need,
2223 int *credits_need)
2224 {
2225 int ret = 0, old_in_xb = 0;
2226 int clusters_add = 0, meta_add = 0, credits = 0;
2227 struct buffer_head *bh = NULL;
2228 struct ocfs2_xattr_block *xb = NULL;
2229 struct ocfs2_xattr_entry *xe = NULL;
2230 struct ocfs2_xattr_value_root *xv = NULL;
2231 char *base = NULL;
2232 int name_offset, name_len = 0;
2233 u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
2234 xi->value_len);
2235 u64 value_size;
2236
2237 /*
2238 * Calculate the clusters we need to write.
2239 * No matter whether we replace an old one or add a new one,
2240 * we need this for writing.
2241 */
2242 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
2243 credits += new_clusters *
2244 ocfs2_clusters_to_blocks(inode->i_sb, 1);
2245
2246 if (xis->not_found && xbs->not_found) {
2247 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2248
2249 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
2250 clusters_add += new_clusters;
2251 credits += ocfs2_calc_extend_credits(inode->i_sb,
2252 &def_xv.xv.xr_list,
2253 new_clusters);
2254 }
2255
2256 goto meta_guess;
2257 }
2258
2259 if (!xis->not_found) {
2260 xe = xis->here;
2261 name_offset = le16_to_cpu(xe->xe_name_offset);
2262 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
2263 base = xis->base;
2264 credits += OCFS2_INODE_UPDATE_CREDITS;
2265 } else {
2266 int i, block_off = 0;
2267 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
2268 xe = xbs->here;
2269 name_offset = le16_to_cpu(xe->xe_name_offset);
2270 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
2271 i = xbs->here - xbs->header->xh_entries;
2272 old_in_xb = 1;
2273
2274 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
2275 ret = ocfs2_xattr_bucket_get_name_value(inode,
2276 bucket_xh(xbs->bucket),
2277 i, &block_off,
2278 &name_offset);
2279 base = bucket_block(xbs->bucket, block_off);
2280 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2281 } else {
2282 base = xbs->base;
2283 credits += OCFS2_XATTR_BLOCK_UPDATE_CREDITS;
2284 }
2285 }
2286
2287 /*
2288 * delete a xattr doesn't need metadata and cluster allocation.
2289 * so just calculate the credits and return.
2290 *
2291 * The credits for removing the value tree will be extended
2292 * by ocfs2_remove_extent itself.
2293 */
2294 if (!xi->value) {
2295 if (!ocfs2_xattr_is_local(xe))
2296 credits += ocfs2_remove_extent_credits(inode->i_sb);
2297
2298 goto out;
2299 }
2300
2301 /* do cluster allocation guess first. */
2302 value_size = le64_to_cpu(xe->xe_value_size);
2303
2304 if (old_in_xb) {
2305 /*
2306 * In xattr set, we always try to set the xe in inode first,
2307 * so if it can be inserted into inode successfully, the old
2308 * one will be removed from the xattr block, and this xattr
2309 * will be inserted into inode as a new xattr in inode.
2310 */
2311 if (ocfs2_xattr_can_be_in_inode(inode, xi, xis)) {
2312 clusters_add += new_clusters;
2313 credits += ocfs2_remove_extent_credits(inode->i_sb) +
2314 OCFS2_INODE_UPDATE_CREDITS;
2315 if (!ocfs2_xattr_is_local(xe))
2316 credits += ocfs2_calc_extend_credits(
2317 inode->i_sb,
2318 &def_xv.xv.xr_list,
2319 new_clusters);
2320 goto out;
2321 }
2322 }
2323
2324 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
2325 /* the new values will be stored outside. */
2326 u32 old_clusters = 0;
2327
2328 if (!ocfs2_xattr_is_local(xe)) {
2329 old_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
2330 value_size);
2331 xv = (struct ocfs2_xattr_value_root *)
2332 (base + name_offset + name_len);
2333 value_size = OCFS2_XATTR_ROOT_SIZE;
2334 } else
2335 xv = &def_xv.xv;
2336
2337 if (old_clusters >= new_clusters) {
2338 credits += ocfs2_remove_extent_credits(inode->i_sb);
2339 goto out;
2340 } else {
2341 meta_add += ocfs2_extend_meta_needed(&xv->xr_list);
2342 clusters_add += new_clusters - old_clusters;
2343 credits += ocfs2_calc_extend_credits(inode->i_sb,
2344 &xv->xr_list,
2345 new_clusters -
2346 old_clusters);
2347 if (value_size >= OCFS2_XATTR_ROOT_SIZE)
2348 goto out;
2349 }
2350 } else {
2351 /*
2352 * Now the new value will be stored inside. So if the new
2353 * value is smaller than the size of value root or the old
2354 * value, we don't need any allocation, otherwise we have
2355 * to guess metadata allocation.
2356 */
2357 if ((ocfs2_xattr_is_local(xe) && value_size >= xi->value_len) ||
2358 (!ocfs2_xattr_is_local(xe) &&
2359 OCFS2_XATTR_ROOT_SIZE >= xi->value_len))
2360 goto out;
2361 }
2362
2363 meta_guess:
2364 /* calculate metadata allocation. */
2365 if (di->i_xattr_loc) {
2366 if (!xbs->xattr_bh) {
2367 ret = ocfs2_read_xattr_block(inode,
2368 le64_to_cpu(di->i_xattr_loc),
2369 &bh);
2370 if (ret) {
2371 mlog_errno(ret);
2372 goto out;
2373 }
2374
2375 xb = (struct ocfs2_xattr_block *)bh->b_data;
2376 } else
2377 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
2378
2379 /*
2380 * If there is already an xattr tree, good, we can calculate
2381 * like other b-trees. Otherwise we may have the chance of
2382 * create a tree, the credit calculation is borrowed from
2383 * ocfs2_calc_extend_credits with root_el = NULL. And the
2384 * new tree will be cluster based, so no meta is needed.
2385 */
2386 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
2387 struct ocfs2_extent_list *el =
2388 &xb->xb_attrs.xb_root.xt_list;
2389 meta_add += ocfs2_extend_meta_needed(el);
2390 credits += ocfs2_calc_extend_credits(inode->i_sb,
2391 el, 1);
2392 } else
2393 credits += OCFS2_SUBALLOC_ALLOC + 1;
2394
2395 /*
2396 * This cluster will be used either for new bucket or for
2397 * new xattr block.
2398 * If the cluster size is the same as the bucket size, one
2399 * more is needed since we may need to extend the bucket
2400 * also.
2401 */
2402 clusters_add += 1;
2403 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2404 if (OCFS2_XATTR_BUCKET_SIZE ==
2405 OCFS2_SB(inode->i_sb)->s_clustersize) {
2406 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2407 clusters_add += 1;
2408 }
2409 } else {
2410 meta_add += 1;
2411 credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
2412 }
2413 out:
2414 if (clusters_need)
2415 *clusters_need = clusters_add;
2416 if (meta_need)
2417 *meta_need = meta_add;
2418 if (credits_need)
2419 *credits_need = credits;
2420 brelse(bh);
2421 return ret;
2422 }
2423
2424 static int ocfs2_init_xattr_set_ctxt(struct inode *inode,
2425 struct ocfs2_dinode *di,
2426 struct ocfs2_xattr_info *xi,
2427 struct ocfs2_xattr_search *xis,
2428 struct ocfs2_xattr_search *xbs,
2429 struct ocfs2_xattr_set_ctxt *ctxt,
2430 int *credits)
2431 {
2432 int clusters_add, meta_add, ret;
2433 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2434
2435 memset(ctxt, 0, sizeof(struct ocfs2_xattr_set_ctxt));
2436
2437 ocfs2_init_dealloc_ctxt(&ctxt->dealloc);
2438
2439 ret = ocfs2_calc_xattr_set_need(inode, di, xi, xis, xbs,
2440 &clusters_add, &meta_add, credits);
2441 if (ret) {
2442 mlog_errno(ret);
2443 return ret;
2444 }
2445
2446 mlog(0, "Set xattr %s, reserve meta blocks = %d, clusters = %d, "
2447 "credits = %d\n", xi->name, meta_add, clusters_add, *credits);
2448
2449 if (meta_add) {
2450 ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add,
2451 &ctxt->meta_ac);
2452 if (ret) {
2453 mlog_errno(ret);
2454 goto out;
2455 }
2456 }
2457
2458 if (clusters_add) {
2459 ret = ocfs2_reserve_clusters(osb, clusters_add, &ctxt->data_ac);
2460 if (ret)
2461 mlog_errno(ret);
2462 }
2463 out:
2464 if (ret) {
2465 if (ctxt->meta_ac) {
2466 ocfs2_free_alloc_context(ctxt->meta_ac);
2467 ctxt->meta_ac = NULL;
2468 }
2469
2470 /*
2471 * We cannot have an error and a non null ctxt->data_ac.
2472 */
2473 }
2474
2475 return ret;
2476 }
2477
2478 static int __ocfs2_xattr_set_handle(struct inode *inode,
2479 struct ocfs2_dinode *di,
2480 struct ocfs2_xattr_info *xi,
2481 struct ocfs2_xattr_search *xis,
2482 struct ocfs2_xattr_search *xbs,
2483 struct ocfs2_xattr_set_ctxt *ctxt)
2484 {
2485 int ret = 0, credits, old_found;
2486
2487 if (!xi->value) {
2488 /* Remove existing extended attribute */
2489 if (!xis->not_found)
2490 ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
2491 else if (!xbs->not_found)
2492 ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
2493 } else {
2494 /* We always try to set extended attribute into inode first*/
2495 ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
2496 if (!ret && !xbs->not_found) {
2497 /*
2498 * If succeed and that extended attribute existing in
2499 * external block, then we will remove it.
2500 */
2501 xi->value = NULL;
2502 xi->value_len = 0;
2503
2504 old_found = xis->not_found;
2505 xis->not_found = -ENODATA;
2506 ret = ocfs2_calc_xattr_set_need(inode,
2507 di,
2508 xi,
2509 xis,
2510 xbs,
2511 NULL,
2512 NULL,
2513 &credits);
2514 xis->not_found = old_found;
2515 if (ret) {
2516 mlog_errno(ret);
2517 goto out;
2518 }
2519
2520 ret = ocfs2_extend_trans(ctxt->handle, credits +
2521 ctxt->handle->h_buffer_credits);
2522 if (ret) {
2523 mlog_errno(ret);
2524 goto out;
2525 }
2526 ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
2527 } else if (ret == -ENOSPC) {
2528 if (di->i_xattr_loc && !xbs->xattr_bh) {
2529 ret = ocfs2_xattr_block_find(inode,
2530 xi->name_index,
2531 xi->name, xbs);
2532 if (ret)
2533 goto out;
2534
2535 old_found = xis->not_found;
2536 xis->not_found = -ENODATA;
2537 ret = ocfs2_calc_xattr_set_need(inode,
2538 di,
2539 xi,
2540 xis,
2541 xbs,
2542 NULL,
2543 NULL,
2544 &credits);
2545 xis->not_found = old_found;
2546 if (ret) {
2547 mlog_errno(ret);
2548 goto out;
2549 }
2550
2551 ret = ocfs2_extend_trans(ctxt->handle, credits +
2552 ctxt->handle->h_buffer_credits);
2553 if (ret) {
2554 mlog_errno(ret);
2555 goto out;
2556 }
2557 }
2558 /*
2559 * If no space in inode, we will set extended attribute
2560 * into external block.
2561 */
2562 ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
2563 if (ret)
2564 goto out;
2565 if (!xis->not_found) {
2566 /*
2567 * If succeed and that extended attribute
2568 * existing in inode, we will remove it.
2569 */
2570 xi->value = NULL;
2571 xi->value_len = 0;
2572 xbs->not_found = -ENODATA;
2573 ret = ocfs2_calc_xattr_set_need(inode,
2574 di,
2575 xi,
2576 xis,
2577 xbs,
2578 NULL,
2579 NULL,
2580 &credits);
2581 if (ret) {
2582 mlog_errno(ret);
2583 goto out;
2584 }
2585
2586 ret = ocfs2_extend_trans(ctxt->handle, credits +
2587 ctxt->handle->h_buffer_credits);
2588 if (ret) {
2589 mlog_errno(ret);
2590 goto out;
2591 }
2592 ret = ocfs2_xattr_ibody_set(inode, xi,
2593 xis, ctxt);
2594 }
2595 }
2596 }
2597
2598 if (!ret) {
2599 /* Update inode ctime. */
2600 ret = ocfs2_journal_access_di(ctxt->handle, inode,
2601 xis->inode_bh,
2602 OCFS2_JOURNAL_ACCESS_WRITE);
2603 if (ret) {
2604 mlog_errno(ret);
2605 goto out;
2606 }
2607
2608 inode->i_ctime = CURRENT_TIME;
2609 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
2610 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
2611 ocfs2_journal_dirty(ctxt->handle, xis->inode_bh);
2612 }
2613 out:
2614 return ret;
2615 }
2616
2617 /*
2618 * This function only called duing creating inode
2619 * for init security/acl xattrs of the new inode.
2620 * All transanction credits have been reserved in mknod.
2621 */
2622 int ocfs2_xattr_set_handle(handle_t *handle,
2623 struct inode *inode,
2624 struct buffer_head *di_bh,
2625 int name_index,
2626 const char *name,
2627 const void *value,
2628 size_t value_len,
2629 int flags,
2630 struct ocfs2_alloc_context *meta_ac,
2631 struct ocfs2_alloc_context *data_ac)
2632 {
2633 struct ocfs2_dinode *di;
2634 int ret;
2635
2636 struct ocfs2_xattr_info xi = {
2637 .name_index = name_index,
2638 .name = name,
2639 .value = value,
2640 .value_len = value_len,
2641 };
2642
2643 struct ocfs2_xattr_search xis = {
2644 .not_found = -ENODATA,
2645 };
2646
2647 struct ocfs2_xattr_search xbs = {
2648 .not_found = -ENODATA,
2649 };
2650
2651 struct ocfs2_xattr_set_ctxt ctxt = {
2652 .handle = handle,
2653 .meta_ac = meta_ac,
2654 .data_ac = data_ac,
2655 };
2656
2657 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2658 return -EOPNOTSUPP;
2659
2660 /*
2661 * In extreme situation, may need xattr bucket when
2662 * block size is too small. And we have already reserved
2663 * the credits for bucket in mknod.
2664 */
2665 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) {
2666 xbs.bucket = ocfs2_xattr_bucket_new(inode);
2667 if (!xbs.bucket) {
2668 mlog_errno(-ENOMEM);
2669 return -ENOMEM;
2670 }
2671 }
2672
2673 xis.inode_bh = xbs.inode_bh = di_bh;
2674 di = (struct ocfs2_dinode *)di_bh->b_data;
2675
2676 down_write(&OCFS2_I(inode)->ip_xattr_sem);
2677
2678 ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
2679 if (ret)
2680 goto cleanup;
2681 if (xis.not_found) {
2682 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
2683 if (ret)
2684 goto cleanup;
2685 }
2686
2687 ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
2688
2689 cleanup:
2690 up_write(&OCFS2_I(inode)->ip_xattr_sem);
2691 brelse(xbs.xattr_bh);
2692 ocfs2_xattr_bucket_free(xbs.bucket);
2693
2694 return ret;
2695 }
2696
2697 /*
2698 * ocfs2_xattr_set()
2699 *
2700 * Set, replace or remove an extended attribute for this inode.
2701 * value is NULL to remove an existing extended attribute, else either
2702 * create or replace an extended attribute.
2703 */
2704 int ocfs2_xattr_set(struct inode *inode,
2705 int name_index,
2706 const char *name,
2707 const void *value,
2708 size_t value_len,
2709 int flags)
2710 {
2711 struct buffer_head *di_bh = NULL;
2712 struct ocfs2_dinode *di;
2713 int ret, credits;
2714 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2715 struct inode *tl_inode = osb->osb_tl_inode;
2716 struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
2717
2718 struct ocfs2_xattr_info xi = {
2719 .name_index = name_index,
2720 .name = name,
2721 .value = value,
2722 .value_len = value_len,
2723 };
2724
2725 struct ocfs2_xattr_search xis = {
2726 .not_found = -ENODATA,
2727 };
2728
2729 struct ocfs2_xattr_search xbs = {
2730 .not_found = -ENODATA,
2731 };
2732
2733 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2734 return -EOPNOTSUPP;
2735
2736 /*
2737 * Only xbs will be used on indexed trees. xis doesn't need a
2738 * bucket.
2739 */
2740 xbs.bucket = ocfs2_xattr_bucket_new(inode);
2741 if (!xbs.bucket) {
2742 mlog_errno(-ENOMEM);
2743 return -ENOMEM;
2744 }
2745
2746 ret = ocfs2_inode_lock(inode, &di_bh, 1);
2747 if (ret < 0) {
2748 mlog_errno(ret);
2749 goto cleanup_nolock;
2750 }
2751 xis.inode_bh = xbs.inode_bh = di_bh;
2752 di = (struct ocfs2_dinode *)di_bh->b_data;
2753
2754 down_write(&OCFS2_I(inode)->ip_xattr_sem);
2755 /*
2756 * Scan inode and external block to find the same name
2757 * extended attribute and collect search infomation.
2758 */
2759 ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
2760 if (ret)
2761 goto cleanup;
2762 if (xis.not_found) {
2763 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
2764 if (ret)
2765 goto cleanup;
2766 }
2767
2768 if (xis.not_found && xbs.not_found) {
2769 ret = -ENODATA;
2770 if (flags & XATTR_REPLACE)
2771 goto cleanup;
2772 ret = 0;
2773 if (!value)
2774 goto cleanup;
2775 } else {
2776 ret = -EEXIST;
2777 if (flags & XATTR_CREATE)
2778 goto cleanup;
2779 }
2780
2781
2782 mutex_lock(&tl_inode->i_mutex);
2783
2784 if (ocfs2_truncate_log_needs_flush(osb)) {
2785 ret = __ocfs2_flush_truncate_log(osb);
2786 if (ret < 0) {
2787 mutex_unlock(&tl_inode->i_mutex);
2788 mlog_errno(ret);
2789 goto cleanup;
2790 }
2791 }
2792 mutex_unlock(&tl_inode->i_mutex);
2793
2794 ret = ocfs2_init_xattr_set_ctxt(inode, di, &xi, &xis,
2795 &xbs, &ctxt, &credits);
2796 if (ret) {
2797 mlog_errno(ret);
2798 goto cleanup;
2799 }
2800
2801 /* we need to update inode's ctime field, so add credit for it. */
2802 credits += OCFS2_INODE_UPDATE_CREDITS;
2803 ctxt.handle = ocfs2_start_trans(osb, credits);
2804 if (IS_ERR(ctxt.handle)) {
2805 ret = PTR_ERR(ctxt.handle);
2806 mlog_errno(ret);
2807 goto cleanup;
2808 }
2809
2810 ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
2811
2812 ocfs2_commit_trans(osb, ctxt.handle);
2813
2814 if (ctxt.data_ac)
2815 ocfs2_free_alloc_context(ctxt.data_ac);
2816 if (ctxt.meta_ac)
2817 ocfs2_free_alloc_context(ctxt.meta_ac);
2818 if (ocfs2_dealloc_has_cluster(&ctxt.dealloc))
2819 ocfs2_schedule_truncate_log_flush(osb, 1);
2820 ocfs2_run_deallocs(osb, &ctxt.dealloc);
2821 cleanup:
2822 up_write(&OCFS2_I(inode)->ip_xattr_sem);
2823 ocfs2_inode_unlock(inode, 1);
2824 cleanup_nolock:
2825 brelse(di_bh);
2826 brelse(xbs.xattr_bh);
2827 ocfs2_xattr_bucket_free(xbs.bucket);
2828
2829 return ret;
2830 }
2831
2832 /*
2833 * Find the xattr extent rec which may contains name_hash.
2834 * e_cpos will be the first name hash of the xattr rec.
2835 * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
2836 */
2837 static int ocfs2_xattr_get_rec(struct inode *inode,
2838 u32 name_hash,
2839 u64 *p_blkno,
2840 u32 *e_cpos,
2841 u32 *num_clusters,
2842 struct ocfs2_extent_list *el)
2843 {
2844 int ret = 0, i;
2845 struct buffer_head *eb_bh = NULL;
2846 struct ocfs2_extent_block *eb;
2847 struct ocfs2_extent_rec *rec = NULL;
2848 u64 e_blkno = 0;
2849
2850 if (el->l_tree_depth) {
2851 ret = ocfs2_find_leaf(inode, el, name_hash, &eb_bh);
2852 if (ret) {
2853 mlog_errno(ret);
2854 goto out;
2855 }
2856
2857 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2858 el = &eb->h_list;
2859
2860 if (el->l_tree_depth) {
2861 ocfs2_error(inode->i_sb,
2862 "Inode %lu has non zero tree depth in "
2863 "xattr tree block %llu\n", inode->i_ino,
2864 (unsigned long long)eb_bh->b_blocknr);
2865 ret = -EROFS;
2866 goto out;
2867 }
2868 }
2869
2870 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
2871 rec = &el->l_recs[i];
2872
2873 if (le32_to_cpu(rec->e_cpos) <= name_hash) {
2874 e_blkno = le64_to_cpu(rec->e_blkno);
2875 break;
2876 }
2877 }
2878
2879 if (!e_blkno) {
2880 ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
2881 "record (%u, %u, 0) in xattr", inode->i_ino,
2882 le32_to_cpu(rec->e_cpos),
2883 ocfs2_rec_clusters(el, rec));
2884 ret = -EROFS;
2885 goto out;
2886 }
2887
2888 *p_blkno = le64_to_cpu(rec->e_blkno);
2889 *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
2890 if (e_cpos)
2891 *e_cpos = le32_to_cpu(rec->e_cpos);
2892 out:
2893 brelse(eb_bh);
2894 return ret;
2895 }
2896
2897 typedef int (xattr_bucket_func)(struct inode *inode,
2898 struct ocfs2_xattr_bucket *bucket,
2899 void *para);
2900
2901 static int ocfs2_find_xe_in_bucket(struct inode *inode,
2902 struct ocfs2_xattr_bucket *bucket,
2903 int name_index,
2904 const char *name,
2905 u32 name_hash,
2906 u16 *xe_index,
2907 int *found)
2908 {
2909 int i, ret = 0, cmp = 1, block_off, new_offset;
2910 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
2911 size_t name_len = strlen(name);
2912 struct ocfs2_xattr_entry *xe = NULL;
2913 char *xe_name;
2914
2915 /*
2916 * We don't use binary search in the bucket because there
2917 * may be multiple entries with the same name hash.
2918 */
2919 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
2920 xe = &xh->xh_entries[i];
2921
2922 if (name_hash > le32_to_cpu(xe->xe_name_hash))
2923 continue;
2924 else if (name_hash < le32_to_cpu(xe->xe_name_hash))
2925 break;
2926
2927 cmp = name_index - ocfs2_xattr_get_type(xe);
2928 if (!cmp)
2929 cmp = name_len - xe->xe_name_len;
2930 if (cmp)
2931 continue;
2932
2933 ret = ocfs2_xattr_bucket_get_name_value(inode,
2934 xh,
2935 i,
2936 &block_off,
2937 &new_offset);
2938 if (ret) {
2939 mlog_errno(ret);
2940 break;
2941 }
2942
2943
2944 xe_name = bucket_block(bucket, block_off) + new_offset;
2945 if (!memcmp(name, xe_name, name_len)) {
2946 *xe_index = i;
2947 *found = 1;
2948 ret = 0;
2949 break;
2950 }
2951 }
2952
2953 return ret;
2954 }
2955
2956 /*
2957 * Find the specified xattr entry in a series of buckets.
2958 * This series start from p_blkno and last for num_clusters.
2959 * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
2960 * the num of the valid buckets.
2961 *
2962 * Return the buffer_head this xattr should reside in. And if the xattr's
2963 * hash is in the gap of 2 buckets, return the lower bucket.
2964 */
2965 static int ocfs2_xattr_bucket_find(struct inode *inode,
2966 int name_index,
2967 const char *name,
2968 u32 name_hash,
2969 u64 p_blkno,
2970 u32 first_hash,
2971 u32 num_clusters,
2972 struct ocfs2_xattr_search *xs)
2973 {
2974 int ret, found = 0;
2975 struct ocfs2_xattr_header *xh = NULL;
2976 struct ocfs2_xattr_entry *xe = NULL;
2977 u16 index = 0;
2978 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2979 int low_bucket = 0, bucket, high_bucket;
2980 struct ocfs2_xattr_bucket *search;
2981 u32 last_hash;
2982 u64 blkno, lower_blkno = 0;
2983
2984 search = ocfs2_xattr_bucket_new(inode);
2985 if (!search) {
2986 ret = -ENOMEM;
2987 mlog_errno(ret);
2988 goto out;
2989 }
2990
2991 ret = ocfs2_read_xattr_bucket(search, p_blkno);
2992 if (ret) {
2993 mlog_errno(ret);
2994 goto out;
2995 }
2996
2997 xh = bucket_xh(search);
2998 high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
2999 while (low_bucket <= high_bucket) {
3000 ocfs2_xattr_bucket_relse(search);
3001
3002 bucket = (low_bucket + high_bucket) / 2;
3003 blkno = p_blkno + bucket * blk_per_bucket;
3004 ret = ocfs2_read_xattr_bucket(search, blkno);
3005 if (ret) {
3006 mlog_errno(ret);
3007 goto out;
3008 }
3009
3010 xh = bucket_xh(search);
3011 xe = &xh->xh_entries[0];
3012 if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
3013 high_bucket = bucket - 1;
3014 continue;
3015 }
3016
3017 /*
3018 * Check whether the hash of the last entry in our
3019 * bucket is larger than the search one. for an empty
3020 * bucket, the last one is also the first one.
3021 */
3022 if (xh->xh_count)
3023 xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
3024
3025 last_hash = le32_to_cpu(xe->xe_name_hash);
3026
3027 /* record lower_blkno which may be the insert place. */
3028 lower_blkno = blkno;
3029
3030 if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
3031 low_bucket = bucket + 1;
3032 continue;
3033 }
3034
3035 /* the searched xattr should reside in this bucket if exists. */
3036 ret = ocfs2_find_xe_in_bucket(inode, search,
3037 name_index, name, name_hash,
3038 &index, &found);
3039 if (ret) {
3040 mlog_errno(ret);
3041 goto out;
3042 }
3043 break;
3044 }
3045
3046 /*
3047 * Record the bucket we have found.
3048 * When the xattr's hash value is in the gap of 2 buckets, we will
3049 * always set it to the previous bucket.
3050 */
3051 if (!lower_blkno)
3052 lower_blkno = p_blkno;
3053
3054 /* This should be in cache - we just read it during the search */
3055 ret = ocfs2_read_xattr_bucket(xs->bucket, lower_blkno);
3056 if (ret) {
3057 mlog_errno(ret);
3058 goto out;
3059 }
3060
3061 xs->header = bucket_xh(xs->bucket);
3062 xs->base = bucket_block(xs->bucket, 0);
3063 xs->end = xs->base + inode->i_sb->s_blocksize;
3064
3065 if (found) {
3066 xs->here = &xs->header->xh_entries[index];
3067 mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name,
3068 (unsigned long long)bucket_blkno(xs->bucket), index);
3069 } else
3070 ret = -ENODATA;
3071
3072 out:
3073 ocfs2_xattr_bucket_free(search);
3074 return ret;
3075 }
3076
3077 static int ocfs2_xattr_index_block_find(struct inode *inode,
3078 struct buffer_head *root_bh,
3079 int name_index,
3080 const char *name,
3081 struct ocfs2_xattr_search *xs)
3082 {
3083 int ret;
3084 struct ocfs2_xattr_block *xb =
3085 (struct ocfs2_xattr_block *)root_bh->b_data;
3086 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3087 struct ocfs2_extent_list *el = &xb_root->xt_list;
3088 u64 p_blkno = 0;
3089 u32 first_hash, num_clusters = 0;
3090 u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
3091
3092 if (le16_to_cpu(el->l_next_free_rec) == 0)
3093 return -ENODATA;
3094
3095 mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n",
3096 name, name_hash, name_index);
3097
3098 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
3099 &num_clusters, el);
3100 if (ret) {
3101 mlog_errno(ret);
3102 goto out;
3103 }
3104
3105 BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
3106
3107 mlog(0, "find xattr extent rec %u clusters from %llu, the first hash "
3108 "in the rec is %u\n", num_clusters, (unsigned long long)p_blkno,
3109 first_hash);
3110
3111 ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
3112 p_blkno, first_hash, num_clusters, xs);
3113
3114 out:
3115 return ret;
3116 }
3117
3118 static int ocfs2_iterate_xattr_buckets(struct inode *inode,
3119 u64 blkno,
3120 u32 clusters,
3121 xattr_bucket_func *func,
3122 void *para)
3123 {
3124 int i, ret = 0;
3125 u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
3126 u32 num_buckets = clusters * bpc;
3127 struct ocfs2_xattr_bucket *bucket;
3128
3129 bucket = ocfs2_xattr_bucket_new(inode);
3130 if (!bucket) {
3131 mlog_errno(-ENOMEM);
3132 return -ENOMEM;
3133 }
3134
3135 mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n",
3136 clusters, (unsigned long long)blkno);
3137
3138 for (i = 0; i < num_buckets; i++, blkno += bucket->bu_blocks) {
3139 ret = ocfs2_read_xattr_bucket(bucket, blkno);
3140 if (ret) {
3141 mlog_errno(ret);
3142 break;
3143 }
3144
3145 /*
3146 * The real bucket num in this series of blocks is stored
3147 * in the 1st bucket.
3148 */
3149 if (i == 0)
3150 num_buckets = le16_to_cpu(bucket_xh(bucket)->xh_num_buckets);
3151
3152 mlog(0, "iterating xattr bucket %llu, first hash %u\n",
3153 (unsigned long long)blkno,
3154 le32_to_cpu(bucket_xh(bucket)->xh_entries[0].xe_name_hash));
3155 if (func) {
3156 ret = func(inode, bucket, para);
3157 if (ret && ret != -ERANGE)
3158 mlog_errno(ret);
3159 /* Fall through to bucket_relse() */
3160 }
3161
3162 ocfs2_xattr_bucket_relse(bucket);
3163 if (ret)
3164 break;
3165 }
3166
3167 ocfs2_xattr_bucket_free(bucket);
3168 return ret;
3169 }
3170
3171 struct ocfs2_xattr_tree_list {
3172 char *buffer;
3173 size_t buffer_size;
3174 size_t result;
3175 };
3176
3177 static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
3178 struct ocfs2_xattr_header *xh,
3179 int index,
3180 int *block_off,
3181 int *new_offset)
3182 {
3183 u16 name_offset;
3184
3185 if (index < 0 || index >= le16_to_cpu(xh->xh_count))
3186 return -EINVAL;
3187
3188 name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
3189
3190 *block_off = name_offset >> inode->i_sb->s_blocksize_bits;
3191 *new_offset = name_offset % inode->i_sb->s_blocksize;
3192
3193 return 0;
3194 }
3195
3196 static int ocfs2_list_xattr_bucket(struct inode *inode,
3197 struct ocfs2_xattr_bucket *bucket,
3198 void *para)
3199 {
3200 int ret = 0, type;
3201 struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
3202 int i, block_off, new_offset;
3203 const char *prefix, *name;
3204
3205 for (i = 0 ; i < le16_to_cpu(bucket_xh(bucket)->xh_count); i++) {
3206 struct ocfs2_xattr_entry *entry = &bucket_xh(bucket)->xh_entries[i];
3207 type = ocfs2_xattr_get_type(entry);
3208 prefix = ocfs2_xattr_prefix(type);
3209
3210 if (prefix) {
3211 ret = ocfs2_xattr_bucket_get_name_value(inode,
3212 bucket_xh(bucket),
3213 i,
3214 &block_off,
3215 &new_offset);
3216 if (ret)
3217 break;
3218
3219 name = (const char *)bucket_block(bucket, block_off) +
3220 new_offset;
3221 ret = ocfs2_xattr_list_entry(xl->buffer,
3222 xl->buffer_size,
3223 &xl->result,
3224 prefix, name,
3225 entry->xe_name_len);
3226 if (ret)
3227 break;
3228 }
3229 }
3230
3231 return ret;
3232 }
3233
3234 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
3235 struct ocfs2_xattr_tree_root *xt,
3236 char *buffer,
3237 size_t buffer_size)
3238 {
3239 struct ocfs2_extent_list *el = &xt->xt_list;
3240 int ret = 0;
3241 u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
3242 u64 p_blkno = 0;
3243 struct ocfs2_xattr_tree_list xl = {
3244 .buffer = buffer,
3245 .buffer_size = buffer_size,
3246 .result = 0,
3247 };
3248
3249 if (le16_to_cpu(el->l_next_free_rec) == 0)
3250 return 0;
3251
3252 while (name_hash > 0) {
3253 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
3254 &e_cpos, &num_clusters, el);
3255 if (ret) {
3256 mlog_errno(ret);
3257 goto out;
3258 }
3259
3260 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
3261 ocfs2_list_xattr_bucket,
3262 &xl);
3263 if (ret) {
3264 if (ret != -ERANGE)
3265 mlog_errno(ret);
3266 goto out;
3267 }
3268
3269 if (e_cpos == 0)
3270 break;
3271
3272 name_hash = e_cpos - 1;
3273 }
3274
3275 ret = xl.result;
3276 out:
3277 return ret;
3278 }
3279
3280 static int cmp_xe(const void *a, const void *b)
3281 {
3282 const struct ocfs2_xattr_entry *l = a, *r = b;
3283 u32 l_hash = le32_to_cpu(l->xe_name_hash);
3284 u32 r_hash = le32_to_cpu(r->xe_name_hash);
3285
3286 if (l_hash > r_hash)
3287 return 1;
3288 if (l_hash < r_hash)
3289 return -1;
3290 return 0;
3291 }
3292
3293 static void swap_xe(void *a, void *b, int size)
3294 {
3295 struct ocfs2_xattr_entry *l = a, *r = b, tmp;
3296
3297 tmp = *l;
3298 memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
3299 memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
3300 }
3301
3302 /*
3303 * When the ocfs2_xattr_block is filled up, new bucket will be created
3304 * and all the xattr entries will be moved to the new bucket.
3305 * The header goes at the start of the bucket, and the names+values are
3306 * filled from the end. This is why *target starts as the last buffer.
3307 * Note: we need to sort the entries since they are not saved in order
3308 * in the ocfs2_xattr_block.
3309 */
3310 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
3311 struct buffer_head *xb_bh,
3312 struct ocfs2_xattr_bucket *bucket)
3313 {
3314 int i, blocksize = inode->i_sb->s_blocksize;
3315 int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3316 u16 offset, size, off_change;
3317 struct ocfs2_xattr_entry *xe;
3318 struct ocfs2_xattr_block *xb =
3319 (struct ocfs2_xattr_block *)xb_bh->b_data;
3320 struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
3321 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
3322 u16 count = le16_to_cpu(xb_xh->xh_count);
3323 char *src = xb_bh->b_data;
3324 char *target = bucket_block(bucket, blks - 1);
3325
3326 mlog(0, "cp xattr from block %llu to bucket %llu\n",
3327 (unsigned long long)xb_bh->b_blocknr,
3328 (unsigned long long)bucket_blkno(bucket));
3329
3330 for (i = 0; i < blks; i++)
3331 memset(bucket_block(bucket, i), 0, blocksize);
3332
3333 /*
3334 * Since the xe_name_offset is based on ocfs2_xattr_header,
3335 * there is a offset change corresponding to the change of
3336 * ocfs2_xattr_header's position.
3337 */
3338 off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
3339 xe = &xb_xh->xh_entries[count - 1];
3340 offset = le16_to_cpu(xe->xe_name_offset) + off_change;
3341 size = blocksize - offset;
3342
3343 /* copy all the names and values. */
3344 memcpy(target + offset, src + offset, size);
3345
3346 /* Init new header now. */
3347 xh->xh_count = xb_xh->xh_count;
3348 xh->xh_num_buckets = cpu_to_le16(1);
3349 xh->xh_name_value_len = cpu_to_le16(size);
3350 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
3351
3352 /* copy all the entries. */
3353 target = bucket_block(bucket, 0);
3354 offset = offsetof(struct ocfs2_xattr_header, xh_entries);
3355 size = count * sizeof(struct ocfs2_xattr_entry);
3356 memcpy(target + offset, (char *)xb_xh + offset, size);
3357
3358 /* Change the xe offset for all the xe because of the move. */
3359 off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
3360 offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
3361 for (i = 0; i < count; i++)
3362 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
3363
3364 mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n",
3365 offset, size, off_change);
3366
3367 sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
3368 cmp_xe, swap_xe);
3369 }
3370
3371 /*
3372 * After we move xattr from block to index btree, we have to
3373 * update ocfs2_xattr_search to the new xe and base.
3374 *
3375 * When the entry is in xattr block, xattr_bh indicates the storage place.
3376 * While if the entry is in index b-tree, "bucket" indicates the
3377 * real place of the xattr.
3378 */
3379 static void ocfs2_xattr_update_xattr_search(struct inode *inode,
3380 struct ocfs2_xattr_search *xs,
3381 struct buffer_head *old_bh)
3382 {
3383 char *buf = old_bh->b_data;
3384 struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
3385 struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
3386 int i;
3387
3388 xs->header = bucket_xh(xs->bucket);
3389 xs->base = bucket_block(xs->bucket, 0);
3390 xs->end = xs->base + inode->i_sb->s_blocksize;
3391
3392 if (xs->not_found)
3393 return;
3394
3395 i = xs->here - old_xh->xh_entries;
3396 xs->here = &xs->header->xh_entries[i];
3397 }
3398
3399 static int ocfs2_xattr_create_index_block(struct inode *inode,
3400 struct ocfs2_xattr_search *xs,
3401 struct ocfs2_xattr_set_ctxt *ctxt)
3402 {
3403 int ret;
3404 u32 bit_off, len;
3405 u64 blkno;
3406 handle_t *handle = ctxt->handle;
3407 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3408 struct ocfs2_inode_info *oi = OCFS2_I(inode);
3409 struct buffer_head *xb_bh = xs->xattr_bh;
3410 struct ocfs2_xattr_block *xb =
3411 (struct ocfs2_xattr_block *)xb_bh->b_data;
3412 struct ocfs2_xattr_tree_root *xr;
3413 u16 xb_flags = le16_to_cpu(xb->xb_flags);
3414
3415 mlog(0, "create xattr index block for %llu\n",
3416 (unsigned long long)xb_bh->b_blocknr);
3417
3418 BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
3419 BUG_ON(!xs->bucket);
3420
3421 /*
3422 * XXX:
3423 * We can use this lock for now, and maybe move to a dedicated mutex
3424 * if performance becomes a problem later.
3425 */
3426 down_write(&oi->ip_alloc_sem);
3427
3428 ret = ocfs2_journal_access_xb(handle, inode, xb_bh,
3429 OCFS2_JOURNAL_ACCESS_WRITE);
3430 if (ret) {
3431 mlog_errno(ret);
3432 goto out;
3433 }
3434
3435 ret = __ocfs2_claim_clusters(osb, handle, ctxt->data_ac,
3436 1, 1, &bit_off, &len);
3437 if (ret) {
3438 mlog_errno(ret);
3439 goto out;
3440 }
3441
3442 /*
3443 * The bucket may spread in many blocks, and
3444 * we will only touch the 1st block and the last block
3445 * in the whole bucket(one for entry and one for data).
3446 */
3447 blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
3448
3449 mlog(0, "allocate 1 cluster from %llu to xattr block\n",
3450 (unsigned long long)blkno);
3451
3452 ret = ocfs2_init_xattr_bucket(xs->bucket, blkno);
3453 if (ret) {
3454 mlog_errno(ret);
3455 goto out;
3456 }
3457
3458 ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
3459 OCFS2_JOURNAL_ACCESS_CREATE);
3460 if (ret) {
3461 mlog_errno(ret);
3462 goto out;
3463 }
3464
3465 ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xs->bucket);
3466 ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
3467
3468 ocfs2_xattr_update_xattr_search(inode, xs, xb_bh);
3469
3470 /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
3471 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
3472 offsetof(struct ocfs2_xattr_block, xb_attrs));
3473
3474 xr = &xb->xb_attrs.xb_root;
3475 xr->xt_clusters = cpu_to_le32(1);
3476 xr->xt_last_eb_blk = 0;
3477 xr->xt_list.l_tree_depth = 0;
3478 xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
3479 xr->xt_list.l_next_free_rec = cpu_to_le16(1);
3480
3481 xr->xt_list.l_recs[0].e_cpos = 0;
3482 xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
3483 xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
3484
3485 xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
3486
3487 ocfs2_journal_dirty(handle, xb_bh);
3488
3489 out:
3490 up_write(&oi->ip_alloc_sem);
3491
3492 return ret;
3493 }
3494
3495 static int cmp_xe_offset(const void *a, const void *b)
3496 {
3497 const struct ocfs2_xattr_entry *l = a, *r = b;
3498 u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
3499 u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
3500
3501 if (l_name_offset < r_name_offset)
3502 return 1;
3503 if (l_name_offset > r_name_offset)
3504 return -1;
3505 return 0;
3506 }
3507
3508 /*
3509 * defrag a xattr bucket if we find that the bucket has some
3510 * holes beteen name/value pairs.
3511 * We will move all the name/value pairs to the end of the bucket
3512 * so that we can spare some space for insertion.
3513 */
3514 static int ocfs2_defrag_xattr_bucket(struct inode *inode,
3515 handle_t *handle,
3516 struct ocfs2_xattr_bucket *bucket)
3517 {
3518 int ret, i;
3519 size_t end, offset, len, value_len;
3520 struct ocfs2_xattr_header *xh;
3521 char *entries, *buf, *bucket_buf = NULL;
3522 u64 blkno = bucket_blkno(bucket);
3523 u16 xh_free_start;
3524 size_t blocksize = inode->i_sb->s_blocksize;
3525 struct ocfs2_xattr_entry *xe;
3526
3527 /*
3528 * In order to make the operation more efficient and generic,
3529 * we copy all the blocks into a contiguous memory and do the
3530 * defragment there, so if anything is error, we will not touch
3531 * the real block.
3532 */
3533 bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
3534 if (!bucket_buf) {
3535 ret = -EIO;
3536 goto out;
3537 }
3538
3539 buf = bucket_buf;
3540 for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
3541 memcpy(buf, bucket_block(bucket, i), blocksize);
3542
3543 ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
3544 OCFS2_JOURNAL_ACCESS_WRITE);
3545 if (ret < 0) {
3546 mlog_errno(ret);
3547 goto out;
3548 }
3549
3550 xh = (struct ocfs2_xattr_header *)bucket_buf;
3551 entries = (char *)xh->xh_entries;
3552 xh_free_start = le16_to_cpu(xh->xh_free_start);
3553
3554 mlog(0, "adjust xattr bucket in %llu, count = %u, "
3555 "xh_free_start = %u, xh_name_value_len = %u.\n",
3556 (unsigned long long)blkno, le16_to_cpu(xh->xh_count),
3557 xh_free_start, le16_to_cpu(xh->xh_name_value_len));
3558
3559 /*
3560 * sort all the entries by their offset.
3561 * the largest will be the first, so that we can
3562 * move them to the end one by one.
3563 */
3564 sort(entries, le16_to_cpu(xh->xh_count),
3565 sizeof(struct ocfs2_xattr_entry),
3566 cmp_xe_offset, swap_xe);
3567
3568 /* Move all name/values to the end of the bucket. */
3569 xe = xh->xh_entries;
3570 end = OCFS2_XATTR_BUCKET_SIZE;
3571 for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
3572 offset = le16_to_cpu(xe->xe_name_offset);
3573 if (ocfs2_xattr_is_local(xe))
3574 value_len = OCFS2_XATTR_SIZE(
3575 le64_to_cpu(xe->xe_value_size));
3576 else
3577 value_len = OCFS2_XATTR_ROOT_SIZE;
3578 len = OCFS2_XATTR_SIZE(xe->xe_name_len) + value_len;
3579
3580 /*
3581 * We must make sure that the name/value pair
3582 * exist in the same block. So adjust end to
3583 * the previous block end if needed.
3584 */
3585 if (((end - len) / blocksize !=
3586 (end - 1) / blocksize))
3587 end = end - end % blocksize;
3588
3589 if (end > offset + len) {
3590 memmove(bucket_buf + end - len,
3591 bucket_buf + offset, len);
3592 xe->xe_name_offset = cpu_to_le16(end - len);
3593 }
3594
3595 mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
3596 "bucket %llu\n", (unsigned long long)blkno);
3597
3598 end -= len;
3599 }
3600
3601 mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
3602 "bucket %llu\n", (unsigned long long)blkno);
3603
3604 if (xh_free_start == end)
3605 goto out;
3606
3607 memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
3608 xh->xh_free_start = cpu_to_le16(end);
3609
3610 /* sort the entries by their name_hash. */
3611 sort(entries, le16_to_cpu(xh->xh_count),
3612 sizeof(struct ocfs2_xattr_entry),
3613 cmp_xe, swap_xe);
3614
3615 buf = bucket_buf;
3616 for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
3617 memcpy(bucket_block(bucket, i), buf, blocksize);
3618 ocfs2_xattr_bucket_journal_dirty(handle, bucket);
3619
3620 out:
3621 kfree(bucket_buf);
3622 return ret;
3623 }
3624
3625 /*
3626 * prev_blkno points to the start of an existing extent. new_blkno
3627 * points to a newly allocated extent. Because we know each of our
3628 * clusters contains more than bucket, we can easily split one cluster
3629 * at a bucket boundary. So we take the last cluster of the existing
3630 * extent and split it down the middle. We move the last half of the
3631 * buckets in the last cluster of the existing extent over to the new
3632 * extent.
3633 *
3634 * first_bh is the buffer at prev_blkno so we can update the existing
3635 * extent's bucket count. header_bh is the bucket were we were hoping
3636 * to insert our xattr. If the bucket move places the target in the new
3637 * extent, we'll update first_bh and header_bh after modifying the old
3638 * extent.
3639 *
3640 * first_hash will be set as the 1st xe's name_hash in the new extent.
3641 */
3642 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
3643 handle_t *handle,
3644 struct ocfs2_xattr_bucket *first,
3645 struct ocfs2_xattr_bucket *target,
3646 u64 new_blkno,
3647 u32 num_clusters,
3648 u32 *first_hash)
3649 {
3650 int ret;
3651 struct super_block *sb = inode->i_sb;
3652 int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(sb);
3653 int num_buckets = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(sb));
3654 int to_move = num_buckets / 2;
3655 u64 src_blkno;
3656 u64 last_cluster_blkno = bucket_blkno(first) +
3657 ((num_clusters - 1) * ocfs2_clusters_to_blocks(sb, 1));
3658
3659 BUG_ON(le16_to_cpu(bucket_xh(first)->xh_num_buckets) < num_buckets);
3660 BUG_ON(OCFS2_XATTR_BUCKET_SIZE == OCFS2_SB(sb)->s_clustersize);
3661
3662 mlog(0, "move half of xattrs in cluster %llu to %llu\n",
3663 (unsigned long long)last_cluster_blkno, (unsigned long long)new_blkno);
3664
3665 ret = ocfs2_mv_xattr_buckets(inode, handle, bucket_blkno(first),
3666 last_cluster_blkno, new_blkno,
3667 to_move, first_hash);
3668 if (ret) {
3669 mlog_errno(ret);
3670 goto out;
3671 }
3672
3673 /* This is the first bucket that got moved */
3674 src_blkno = last_cluster_blkno + (to_move * blks_per_bucket);
3675
3676 /*
3677 * If the target bucket was part of the moved buckets, we need to
3678 * update first and target.
3679 */
3680 if (bucket_blkno(target) >= src_blkno) {
3681 /* Find the block for the new target bucket */
3682 src_blkno = new_blkno +
3683 (bucket_blkno(target) - src_blkno);
3684
3685 ocfs2_xattr_bucket_relse(first);
3686 ocfs2_xattr_bucket_relse(target);
3687
3688 /*
3689 * These shouldn't fail - the buffers are in the
3690 * journal from ocfs2_cp_xattr_bucket().
3691 */
3692 ret = ocfs2_read_xattr_bucket(first, new_blkno);
3693 if (ret) {
3694 mlog_errno(ret);
3695 goto out;
3696 }
3697 ret = ocfs2_read_xattr_bucket(target, src_blkno);
3698 if (ret)
3699 mlog_errno(ret);
3700
3701 }
3702
3703 out:
3704 return ret;
3705 }
3706
3707 /*
3708 * Find the suitable pos when we divide a bucket into 2.
3709 * We have to make sure the xattrs with the same hash value exist
3710 * in the same bucket.
3711 *
3712 * If this ocfs2_xattr_header covers more than one hash value, find a
3713 * place where the hash value changes. Try to find the most even split.
3714 * The most common case is that all entries have different hash values,
3715 * and the first check we make will find a place to split.
3716 */
3717 static int ocfs2_xattr_find_divide_pos(struct ocfs2_xattr_header *xh)
3718 {
3719 struct ocfs2_xattr_entry *entries = xh->xh_entries;
3720 int count = le16_to_cpu(xh->xh_count);
3721 int delta, middle = count / 2;
3722
3723 /*
3724 * We start at the middle. Each step gets farther away in both
3725 * directions. We therefore hit the change in hash value
3726 * nearest to the middle. Note that this loop does not execute for
3727 * count < 2.
3728 */
3729 for (delta = 0; delta < middle; delta++) {
3730 /* Let's check delta earlier than middle */
3731 if (cmp_xe(&entries[middle - delta - 1],
3732 &entries[middle - delta]))
3733 return middle - delta;
3734
3735 /* For even counts, don't walk off the end */
3736 if ((middle + delta + 1) == count)
3737 continue;
3738
3739 /* Now try delta past middle */
3740 if (cmp_xe(&entries[middle + delta],
3741 &entries[middle + delta + 1]))
3742 return middle + delta + 1;
3743 }
3744
3745 /* Every entry had the same hash */
3746 return count;
3747 }
3748
3749 /*
3750 * Move some xattrs in old bucket(blk) to new bucket(new_blk).
3751 * first_hash will record the 1st hash of the new bucket.
3752 *
3753 * Normally half of the xattrs will be moved. But we have to make
3754 * sure that the xattrs with the same hash value are stored in the
3755 * same bucket. If all the xattrs in this bucket have the same hash
3756 * value, the new bucket will be initialized as an empty one and the
3757 * first_hash will be initialized as (hash_value+1).
3758 */
3759 static int ocfs2_divide_xattr_bucket(struct inode *inode,
3760 handle_t *handle,
3761 u64 blk,
3762 u64 new_blk,
3763 u32 *first_hash,
3764 int new_bucket_head)
3765 {
3766 int ret, i;
3767 int count, start, len, name_value_len = 0, xe_len, name_offset = 0;
3768 struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
3769 struct ocfs2_xattr_header *xh;
3770 struct ocfs2_xattr_entry *xe;
3771 int blocksize = inode->i_sb->s_blocksize;
3772
3773 mlog(0, "move some of xattrs from bucket %llu to %llu\n",
3774 (unsigned long long)blk, (unsigned long long)new_blk);
3775
3776 s_bucket = ocfs2_xattr_bucket_new(inode);
3777 t_bucket = ocfs2_xattr_bucket_new(inode);
3778 if (!s_bucket || !t_bucket) {
3779 ret = -ENOMEM;
3780 mlog_errno(ret);
3781 goto out;
3782 }
3783
3784 ret = ocfs2_read_xattr_bucket(s_bucket, blk);
3785 if (ret) {
3786 mlog_errno(ret);
3787 goto out;
3788 }
3789
3790 ret = ocfs2_xattr_bucket_journal_access(handle, s_bucket,
3791 OCFS2_JOURNAL_ACCESS_WRITE);
3792 if (ret) {
3793 mlog_errno(ret);
3794 goto out;
3795 }
3796
3797 /*
3798 * Even if !new_bucket_head, we're overwriting t_bucket. Thus,
3799 * there's no need to read it.
3800 */
3801 ret = ocfs2_init_xattr_bucket(t_bucket, new_blk);
3802 if (ret) {
3803 mlog_errno(ret);
3804 goto out;
3805 }
3806
3807 /*
3808 * Hey, if we're overwriting t_bucket, what difference does
3809 * ACCESS_CREATE vs ACCESS_WRITE make? See the comment in the
3810 * same part of ocfs2_cp_xattr_bucket().
3811 */
3812 ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
3813 new_bucket_head ?
3814 OCFS2_JOURNAL_ACCESS_CREATE :
3815 OCFS2_JOURNAL_ACCESS_WRITE);
3816 if (ret) {
3817 mlog_errno(ret);
3818 goto out;
3819 }
3820
3821 xh = bucket_xh(s_bucket);
3822 count = le16_to_cpu(xh->xh_count);
3823 start = ocfs2_xattr_find_divide_pos(xh);
3824
3825 if (start == count) {
3826 xe = &xh->xh_entries[start-1];
3827
3828 /*
3829 * initialized a new empty bucket here.
3830 * The hash value is set as one larger than
3831 * that of the last entry in the previous bucket.
3832 */
3833 for (i = 0; i < t_bucket->bu_blocks; i++)
3834 memset(bucket_block(t_bucket, i), 0, blocksize);
3835
3836 xh = bucket_xh(t_bucket);
3837 xh->xh_free_start = cpu_to_le16(blocksize);
3838 xh->xh_entries[0].xe_name_hash = xe->xe_name_hash;
3839 le32_add_cpu(&xh->xh_entries[0].xe_name_hash, 1);
3840
3841 goto set_num_buckets;
3842 }
3843
3844 /* copy the whole bucket to the new first. */
3845 ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
3846
3847 /* update the new bucket. */
3848 xh = bucket_xh(t_bucket);
3849
3850 /*
3851 * Calculate the total name/value len and xh_free_start for
3852 * the old bucket first.
3853 */
3854 name_offset = OCFS2_XATTR_BUCKET_SIZE;
3855 name_value_len = 0;
3856 for (i = 0; i < start; i++) {
3857 xe = &xh->xh_entries[i];
3858 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3859 if (ocfs2_xattr_is_local(xe))
3860 xe_len +=
3861 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3862 else
3863 xe_len += OCFS2_XATTR_ROOT_SIZE;
3864 name_value_len += xe_len;
3865 if (le16_to_cpu(xe->xe_name_offset) < name_offset)
3866 name_offset = le16_to_cpu(xe->xe_name_offset);
3867 }
3868
3869 /*
3870 * Now begin the modification to the new bucket.
3871 *
3872 * In the new bucket, We just move the xattr entry to the beginning
3873 * and don't touch the name/value. So there will be some holes in the
3874 * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
3875 * called.
3876 */
3877 xe = &xh->xh_entries[start];
3878 len = sizeof(struct ocfs2_xattr_entry) * (count - start);
3879 mlog(0, "mv xattr entry len %d from %d to %d\n", len,
3880 (int)((char *)xe - (char *)xh),
3881 (int)((char *)xh->xh_entries - (char *)xh));
3882 memmove((char *)xh->xh_entries, (char *)xe, len);
3883 xe = &xh->xh_entries[count - start];
3884 len = sizeof(struct ocfs2_xattr_entry) * start;
3885 memset((char *)xe, 0, len);
3886
3887 le16_add_cpu(&xh->xh_count, -start);
3888 le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
3889
3890 /* Calculate xh_free_start for the new bucket. */
3891 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
3892 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3893 xe = &xh->xh_entries[i];
3894 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3895 if (ocfs2_xattr_is_local(xe))
3896 xe_len +=
3897 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3898 else
3899 xe_len += OCFS2_XATTR_ROOT_SIZE;
3900 if (le16_to_cpu(xe->xe_name_offset) <
3901 le16_to_cpu(xh->xh_free_start))
3902 xh->xh_free_start = xe->xe_name_offset;
3903 }
3904
3905 set_num_buckets:
3906 /* set xh->xh_num_buckets for the new xh. */
3907 if (new_bucket_head)
3908 xh->xh_num_buckets = cpu_to_le16(1);
3909 else
3910 xh->xh_num_buckets = 0;
3911
3912 ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
3913
3914 /* store the first_hash of the new bucket. */
3915 if (first_hash)
3916 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3917
3918 /*
3919 * Now only update the 1st block of the old bucket. If we
3920 * just added a new empty bucket, there is no need to modify
3921 * it.
3922 */
3923 if (start == count)
3924 goto out;
3925
3926 xh = bucket_xh(s_bucket);
3927 memset(&xh->xh_entries[start], 0,
3928 sizeof(struct ocfs2_xattr_entry) * (count - start));
3929 xh->xh_count = cpu_to_le16(start);
3930 xh->xh_free_start = cpu_to_le16(name_offset);
3931 xh->xh_name_value_len = cpu_to_le16(name_value_len);
3932
3933 ocfs2_xattr_bucket_journal_dirty(handle, s_bucket);
3934
3935 out:
3936 ocfs2_xattr_bucket_free(s_bucket);
3937 ocfs2_xattr_bucket_free(t_bucket);
3938
3939 return ret;
3940 }
3941
3942 /*
3943 * Copy xattr from one bucket to another bucket.
3944 *
3945 * The caller must make sure that the journal transaction
3946 * has enough space for journaling.
3947 */
3948 static int ocfs2_cp_xattr_bucket(struct inode *inode,
3949 handle_t *handle,
3950 u64 s_blkno,
3951 u64 t_blkno,
3952 int t_is_new)
3953 {
3954 int ret;
3955 struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
3956
3957 BUG_ON(s_blkno == t_blkno);
3958
3959 mlog(0, "cp bucket %llu to %llu, target is %d\n",
3960 (unsigned long long)s_blkno, (unsigned long long)t_blkno,
3961 t_is_new);
3962
3963 s_bucket = ocfs2_xattr_bucket_new(inode);
3964 t_bucket = ocfs2_xattr_bucket_new(inode);
3965 if (!s_bucket || !t_bucket) {
3966 ret = -ENOMEM;
3967 mlog_errno(ret);
3968 goto out;
3969 }
3970
3971 ret = ocfs2_read_xattr_bucket(s_bucket, s_blkno);
3972 if (ret)
3973 goto out;
3974
3975 /*
3976 * Even if !t_is_new, we're overwriting t_bucket. Thus,
3977 * there's no need to read it.
3978 */
3979 ret = ocfs2_init_xattr_bucket(t_bucket, t_blkno);
3980 if (ret)
3981 goto out;
3982
3983 /*
3984 * Hey, if we're overwriting t_bucket, what difference does
3985 * ACCESS_CREATE vs ACCESS_WRITE make? Well, if we allocated a new
3986 * cluster to fill, we came here from
3987 * ocfs2_mv_xattr_buckets(), and it is really new -
3988 * ACCESS_CREATE is required. But we also might have moved data
3989 * out of t_bucket before extending back into it.
3990 * ocfs2_add_new_xattr_bucket() can do this - its call to
3991 * ocfs2_add_new_xattr_cluster() may have created a new extent
3992 * and copied out the end of the old extent. Then it re-extends
3993 * the old extent back to create space for new xattrs. That's
3994 * how we get here, and the bucket isn't really new.
3995 */
3996 ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
3997 t_is_new ?
3998 OCFS2_JOURNAL_ACCESS_CREATE :
3999 OCFS2_JOURNAL_ACCESS_WRITE);
4000 if (ret)
4001 goto out;
4002
4003 ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4004 ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4005
4006 out:
4007 ocfs2_xattr_bucket_free(t_bucket);
4008 ocfs2_xattr_bucket_free(s_bucket);
4009
4010 return ret;
4011 }
4012
4013 /*
4014 * src_blk points to the start of an existing extent. last_blk points to
4015 * last cluster in that extent. to_blk points to a newly allocated
4016 * extent. We copy the buckets from the cluster at last_blk to the new
4017 * extent. If start_bucket is non-zero, we skip that many buckets before
4018 * we start copying. The new extent's xh_num_buckets gets set to the
4019 * number of buckets we copied. The old extent's xh_num_buckets shrinks
4020 * by the same amount.
4021 */
4022 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
4023 u64 src_blk, u64 last_blk, u64 to_blk,
4024 unsigned int start_bucket,
4025 u32 *first_hash)
4026 {
4027 int i, ret, credits;
4028 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4029 int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4030 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
4031 struct ocfs2_xattr_bucket *old_first, *new_first;
4032
4033 mlog(0, "mv xattrs from cluster %llu to %llu\n",
4034 (unsigned long long)last_blk, (unsigned long long)to_blk);
4035
4036 BUG_ON(start_bucket >= num_buckets);
4037 if (start_bucket) {
4038 num_buckets -= start_bucket;
4039 last_blk += (start_bucket * blks_per_bucket);
4040 }
4041
4042 /* The first bucket of the original extent */
4043 old_first = ocfs2_xattr_bucket_new(inode);
4044 /* The first bucket of the new extent */
4045 new_first = ocfs2_xattr_bucket_new(inode);
4046 if (!old_first || !new_first) {
4047 ret = -ENOMEM;
4048 mlog_errno(ret);
4049 goto out;
4050 }
4051
4052 ret = ocfs2_read_xattr_bucket(old_first, src_blk);
4053 if (ret) {
4054 mlog_errno(ret);
4055 goto out;
4056 }
4057
4058 /*
4059 * We need to update the first bucket of the old extent and all
4060 * the buckets going to the new extent.
4061 */
4062 credits = ((num_buckets + 1) * blks_per_bucket) +
4063 handle->h_buffer_credits;
4064 ret = ocfs2_extend_trans(handle, credits);
4065 if (ret) {
4066 mlog_errno(ret);
4067 goto out;
4068 }
4069
4070 ret = ocfs2_xattr_bucket_journal_access(handle, old_first,
4071 OCFS2_JOURNAL_ACCESS_WRITE);
4072 if (ret) {
4073 mlog_errno(ret);
4074 goto out;
4075 }
4076
4077 for (i = 0; i < num_buckets; i++) {
4078 ret = ocfs2_cp_xattr_bucket(inode, handle,
4079 last_blk + (i * blks_per_bucket),
4080 to_blk + (i * blks_per_bucket),
4081 1);
4082 if (ret) {
4083 mlog_errno(ret);
4084 goto out;
4085 }
4086 }
4087
4088 /*
4089 * Get the new bucket ready before we dirty anything
4090 * (This actually shouldn't fail, because we already dirtied
4091 * it once in ocfs2_cp_xattr_bucket()).
4092 */
4093 ret = ocfs2_read_xattr_bucket(new_first, to_blk);
4094 if (ret) {
4095 mlog_errno(ret);
4096 goto out;
4097 }
4098 ret = ocfs2_xattr_bucket_journal_access(handle, new_first,
4099 OCFS2_JOURNAL_ACCESS_WRITE);
4100 if (ret) {
4101 mlog_errno(ret);
4102 goto out;
4103 }
4104
4105 /* Now update the headers */
4106 le16_add_cpu(&bucket_xh(old_first)->xh_num_buckets, -num_buckets);
4107 ocfs2_xattr_bucket_journal_dirty(handle, old_first);
4108
4109 bucket_xh(new_first)->xh_num_buckets = cpu_to_le16(num_buckets);
4110 ocfs2_xattr_bucket_journal_dirty(handle, new_first);
4111
4112 if (first_hash)
4113 *first_hash = le32_to_cpu(bucket_xh(new_first)->xh_entries[0].xe_name_hash);
4114
4115 out:
4116 ocfs2_xattr_bucket_free(new_first);
4117 ocfs2_xattr_bucket_free(old_first);
4118 return ret;
4119 }
4120
4121 /*
4122 * Move some xattrs in this cluster to the new cluster.
4123 * This function should only be called when bucket size == cluster size.
4124 * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
4125 */
4126 static int ocfs2_divide_xattr_cluster(struct inode *inode,
4127 handle_t *handle,
4128 u64 prev_blk,
4129 u64 new_blk,
4130 u32 *first_hash)
4131 {
4132 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4133 int ret, credits = 2 * blk_per_bucket + handle->h_buffer_credits;
4134
4135 BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
4136
4137 ret = ocfs2_extend_trans(handle, credits);
4138 if (ret) {
4139 mlog_errno(ret);
4140 return ret;
4141 }
4142
4143 /* Move half of the xattr in start_blk to the next bucket. */
4144 return ocfs2_divide_xattr_bucket(inode, handle, prev_blk,
4145 new_blk, first_hash, 1);
4146 }
4147
4148 /*
4149 * Move some xattrs from the old cluster to the new one since they are not
4150 * contiguous in ocfs2 xattr tree.
4151 *
4152 * new_blk starts a new separate cluster, and we will move some xattrs from
4153 * prev_blk to it. v_start will be set as the first name hash value in this
4154 * new cluster so that it can be used as e_cpos during tree insertion and
4155 * don't collide with our original b-tree operations. first_bh and header_bh
4156 * will also be updated since they will be used in ocfs2_extend_xattr_bucket
4157 * to extend the insert bucket.
4158 *
4159 * The problem is how much xattr should we move to the new one and when should
4160 * we update first_bh and header_bh?
4161 * 1. If cluster size > bucket size, that means the previous cluster has more
4162 * than 1 bucket, so just move half nums of bucket into the new cluster and
4163 * update the first_bh and header_bh if the insert bucket has been moved
4164 * to the new cluster.
4165 * 2. If cluster_size == bucket_size:
4166 * a) If the previous extent rec has more than one cluster and the insert
4167 * place isn't in the last cluster, copy the entire last cluster to the
4168 * new one. This time, we don't need to upate the first_bh and header_bh
4169 * since they will not be moved into the new cluster.
4170 * b) Otherwise, move the bottom half of the xattrs in the last cluster into
4171 * the new one. And we set the extend flag to zero if the insert place is
4172 * moved into the new allocated cluster since no extend is needed.
4173 */
4174 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
4175 handle_t *handle,
4176 struct ocfs2_xattr_bucket *first,
4177 struct ocfs2_xattr_bucket *target,
4178 u64 new_blk,
4179 u32 prev_clusters,
4180 u32 *v_start,
4181 int *extend)
4182 {
4183 int ret;
4184
4185 mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n",
4186 (unsigned long long)bucket_blkno(first), prev_clusters,
4187 (unsigned long long)new_blk);
4188
4189 if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1) {
4190 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
4191 handle,
4192 first, target,
4193 new_blk,
4194 prev_clusters,
4195 v_start);
4196 if (ret)
4197 mlog_errno(ret);
4198 } else {
4199 /* The start of the last cluster in the first extent */
4200 u64 last_blk = bucket_blkno(first) +
4201 ((prev_clusters - 1) *
4202 ocfs2_clusters_to_blocks(inode->i_sb, 1));
4203
4204 if (prev_clusters > 1 && bucket_blkno(target) != last_blk) {
4205 ret = ocfs2_mv_xattr_buckets(inode, handle,
4206 bucket_blkno(first),
4207 last_blk, new_blk, 0,
4208 v_start);
4209 if (ret)
4210 mlog_errno(ret);
4211 } else {
4212 ret = ocfs2_divide_xattr_cluster(inode, handle,
4213 last_blk, new_blk,
4214 v_start);
4215 if (ret)
4216 mlog_errno(ret);
4217
4218 if ((bucket_blkno(target) == last_blk) && extend)
4219 *extend = 0;
4220 }
4221 }
4222
4223 return ret;
4224 }
4225
4226 /*
4227 * Add a new cluster for xattr storage.
4228 *
4229 * If the new cluster is contiguous with the previous one, it will be
4230 * appended to the same extent record, and num_clusters will be updated.
4231 * If not, we will insert a new extent for it and move some xattrs in
4232 * the last cluster into the new allocated one.
4233 * We also need to limit the maximum size of a btree leaf, otherwise we'll
4234 * lose the benefits of hashing because we'll have to search large leaves.
4235 * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
4236 * if it's bigger).
4237 *
4238 * first_bh is the first block of the previous extent rec and header_bh
4239 * indicates the bucket we will insert the new xattrs. They will be updated
4240 * when the header_bh is moved into the new cluster.
4241 */
4242 static int ocfs2_add_new_xattr_cluster(struct inode *inode,
4243 struct buffer_head *root_bh,
4244 struct ocfs2_xattr_bucket *first,
4245 struct ocfs2_xattr_bucket *target,
4246 u32 *num_clusters,
4247 u32 prev_cpos,
4248 int *extend,
4249 struct ocfs2_xattr_set_ctxt *ctxt)
4250 {
4251 int ret;
4252 u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
4253 u32 prev_clusters = *num_clusters;
4254 u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
4255 u64 block;
4256 handle_t *handle = ctxt->handle;
4257 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4258 struct ocfs2_extent_tree et;
4259
4260 mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, "
4261 "previous xattr blkno = %llu\n",
4262 (unsigned long long)OCFS2_I(inode)->ip_blkno,
4263 prev_cpos, (unsigned long long)bucket_blkno(first));
4264
4265 ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
4266
4267 ret = ocfs2_journal_access_xb(handle, inode, root_bh,
4268 OCFS2_JOURNAL_ACCESS_WRITE);
4269 if (ret < 0) {
4270 mlog_errno(ret);
4271 goto leave;
4272 }
4273
4274 ret = __ocfs2_claim_clusters(osb, handle, ctxt->data_ac, 1,
4275 clusters_to_add, &bit_off, &num_bits);
4276 if (ret < 0) {
4277 if (ret != -ENOSPC)
4278 mlog_errno(ret);
4279 goto leave;
4280 }
4281
4282 BUG_ON(num_bits > clusters_to_add);
4283
4284 block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
4285 mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n",
4286 num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
4287
4288 if (bucket_blkno(first) + (prev_clusters * bpc) == block &&
4289 (prev_clusters + num_bits) << osb->s_clustersize_bits <=
4290 OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
4291 /*
4292 * If this cluster is contiguous with the old one and
4293 * adding this new cluster, we don't surpass the limit of
4294 * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
4295 * initialized and used like other buckets in the previous
4296 * cluster.
4297 * So add it as a contiguous one. The caller will handle
4298 * its init process.
4299 */
4300 v_start = prev_cpos + prev_clusters;
4301 *num_clusters = prev_clusters + num_bits;
4302 mlog(0, "Add contiguous %u clusters to previous extent rec.\n",
4303 num_bits);
4304 } else {
4305 ret = ocfs2_adjust_xattr_cross_cluster(inode,
4306 handle,
4307 first,
4308 target,
4309 block,
4310 prev_clusters,
4311 &v_start,
4312 extend);
4313 if (ret) {
4314 mlog_errno(ret);
4315 goto leave;
4316 }
4317 }
4318
4319 mlog(0, "Insert %u clusters at block %llu for xattr at %u\n",
4320 num_bits, (unsigned long long)block, v_start);
4321 ret = ocfs2_insert_extent(osb, handle, inode, &et, v_start, block,
4322 num_bits, 0, ctxt->meta_ac);
4323 if (ret < 0) {
4324 mlog_errno(ret);
4325 goto leave;
4326 }
4327
4328 ret = ocfs2_journal_dirty(handle, root_bh);
4329 if (ret < 0)
4330 mlog_errno(ret);
4331
4332 leave:
4333 return ret;
4334 }
4335
4336 /*
4337 * We are given an extent. 'first' is the bucket at the very front of
4338 * the extent. The extent has space for an additional bucket past
4339 * bucket_xh(first)->xh_num_buckets. 'target_blkno' is the block number
4340 * of the target bucket. We wish to shift every bucket past the target
4341 * down one, filling in that additional space. When we get back to the
4342 * target, we split the target between itself and the now-empty bucket
4343 * at target+1 (aka, target_blkno + blks_per_bucket).
4344 */
4345 static int ocfs2_extend_xattr_bucket(struct inode *inode,
4346 handle_t *handle,
4347 struct ocfs2_xattr_bucket *first,
4348 u64 target_blk,
4349 u32 num_clusters)
4350 {
4351 int ret, credits;
4352 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4353 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4354 u64 end_blk;
4355 u16 new_bucket = le16_to_cpu(bucket_xh(first)->xh_num_buckets);
4356
4357 mlog(0, "extend xattr bucket in %llu, xattr extend rec starting "
4358 "from %llu, len = %u\n", (unsigned long long)target_blk,
4359 (unsigned long long)bucket_blkno(first), num_clusters);
4360
4361 /* The extent must have room for an additional bucket */
4362 BUG_ON(new_bucket >=
4363 (num_clusters * ocfs2_xattr_buckets_per_cluster(osb)));
4364
4365 /* end_blk points to the last existing bucket */
4366 end_blk = bucket_blkno(first) + ((new_bucket - 1) * blk_per_bucket);
4367
4368 /*
4369 * end_blk is the start of the last existing bucket.
4370 * Thus, (end_blk - target_blk) covers the target bucket and
4371 * every bucket after it up to, but not including, the last
4372 * existing bucket. Then we add the last existing bucket, the
4373 * new bucket, and the first bucket (3 * blk_per_bucket).
4374 */
4375 credits = (end_blk - target_blk) + (3 * blk_per_bucket) +
4376 handle->h_buffer_credits;
4377 ret = ocfs2_extend_trans(handle, credits);
4378 if (ret) {
4379 mlog_errno(ret);
4380 goto out;
4381 }
4382
4383 ret = ocfs2_xattr_bucket_journal_access(handle, first,
4384 OCFS2_JOURNAL_ACCESS_WRITE);
4385 if (ret) {
4386 mlog_errno(ret);
4387 goto out;
4388 }
4389
4390 while (end_blk != target_blk) {
4391 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
4392 end_blk + blk_per_bucket, 0);
4393 if (ret)
4394 goto out;
4395 end_blk -= blk_per_bucket;
4396 }
4397
4398 /* Move half of the xattr in target_blkno to the next bucket. */
4399 ret = ocfs2_divide_xattr_bucket(inode, handle, target_blk,
4400 target_blk + blk_per_bucket, NULL, 0);
4401
4402 le16_add_cpu(&bucket_xh(first)->xh_num_buckets, 1);
4403 ocfs2_xattr_bucket_journal_dirty(handle, first);
4404
4405 out:
4406 return ret;
4407 }
4408
4409 /*
4410 * Add new xattr bucket in an extent record and adjust the buckets
4411 * accordingly. xb_bh is the ocfs2_xattr_block, and target is the
4412 * bucket we want to insert into.
4413 *
4414 * In the easy case, we will move all the buckets after target down by
4415 * one. Half of target's xattrs will be moved to the next bucket.
4416 *
4417 * If current cluster is full, we'll allocate a new one. This may not
4418 * be contiguous. The underlying calls will make sure that there is
4419 * space for the insert, shifting buckets around if necessary.
4420 * 'target' may be moved by those calls.
4421 */
4422 static int ocfs2_add_new_xattr_bucket(struct inode *inode,
4423 struct buffer_head *xb_bh,
4424 struct ocfs2_xattr_bucket *target,
4425 struct ocfs2_xattr_set_ctxt *ctxt)
4426 {
4427 struct ocfs2_xattr_block *xb =
4428 (struct ocfs2_xattr_block *)xb_bh->b_data;
4429 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
4430 struct ocfs2_extent_list *el = &xb_root->xt_list;
4431 u32 name_hash =
4432 le32_to_cpu(bucket_xh(target)->xh_entries[0].xe_name_hash);
4433 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4434 int ret, num_buckets, extend = 1;
4435 u64 p_blkno;
4436 u32 e_cpos, num_clusters;
4437 /* The bucket at the front of the extent */
4438 struct ocfs2_xattr_bucket *first;
4439
4440 mlog(0, "Add new xattr bucket starting from %llu\n",
4441 (unsigned long long)bucket_blkno(target));
4442
4443 /* The first bucket of the original extent */
4444 first = ocfs2_xattr_bucket_new(inode);
4445 if (!first) {
4446 ret = -ENOMEM;
4447 mlog_errno(ret);
4448 goto out;
4449 }
4450
4451 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
4452 &num_clusters, el);
4453 if (ret) {
4454 mlog_errno(ret);
4455 goto out;
4456 }
4457
4458 ret = ocfs2_read_xattr_bucket(first, p_blkno);
4459 if (ret) {
4460 mlog_errno(ret);
4461 goto out;
4462 }
4463
4464 num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
4465 if (num_buckets == le16_to_cpu(bucket_xh(first)->xh_num_buckets)) {
4466 /*
4467 * This can move first+target if the target bucket moves
4468 * to the new extent.
4469 */
4470 ret = ocfs2_add_new_xattr_cluster(inode,
4471 xb_bh,
4472 first,
4473 target,
4474 &num_clusters,
4475 e_cpos,
4476 &extend,
4477 ctxt);
4478 if (ret) {
4479 mlog_errno(ret);
4480 goto out;
4481 }
4482 }
4483
4484 if (extend) {
4485 ret = ocfs2_extend_xattr_bucket(inode,
4486 ctxt->handle,
4487 first,
4488 bucket_blkno(target),
4489 num_clusters);
4490 if (ret)
4491 mlog_errno(ret);
4492 }
4493
4494 out:
4495 ocfs2_xattr_bucket_free(first);
4496
4497 return ret;
4498 }
4499
4500 static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode,
4501 struct ocfs2_xattr_bucket *bucket,
4502 int offs)
4503 {
4504 int block_off = offs >> inode->i_sb->s_blocksize_bits;
4505
4506 offs = offs % inode->i_sb->s_blocksize;
4507 return bucket_block(bucket, block_off) + offs;
4508 }
4509
4510 /*
4511 * Handle the normal xattr set, including replace, delete and new.
4512 *
4513 * Note: "local" indicates the real data's locality. So we can't
4514 * just its bucket locality by its length.
4515 */
4516 static void ocfs2_xattr_set_entry_normal(struct inode *inode,
4517 struct ocfs2_xattr_info *xi,
4518 struct ocfs2_xattr_search *xs,
4519 u32 name_hash,
4520 int local)
4521 {
4522 struct ocfs2_xattr_entry *last, *xe;
4523 int name_len = strlen(xi->name);
4524 struct ocfs2_xattr_header *xh = xs->header;
4525 u16 count = le16_to_cpu(xh->xh_count), start;
4526 size_t blocksize = inode->i_sb->s_blocksize;
4527 char *val;
4528 size_t offs, size, new_size;
4529
4530 last = &xh->xh_entries[count];
4531 if (!xs->not_found) {
4532 xe = xs->here;
4533 offs = le16_to_cpu(xe->xe_name_offset);
4534 if (ocfs2_xattr_is_local(xe))
4535 size = OCFS2_XATTR_SIZE(name_len) +
4536 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
4537 else
4538 size = OCFS2_XATTR_SIZE(name_len) +
4539 OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
4540
4541 /*
4542 * If the new value will be stored outside, xi->value has been
4543 * initalized as an empty ocfs2_xattr_value_root, and the same
4544 * goes with xi->value_len, so we can set new_size safely here.
4545 * See ocfs2_xattr_set_in_bucket.
4546 */
4547 new_size = OCFS2_XATTR_SIZE(name_len) +
4548 OCFS2_XATTR_SIZE(xi->value_len);
4549
4550 le16_add_cpu(&xh->xh_name_value_len, -size);
4551 if (xi->value) {
4552 if (new_size > size)
4553 goto set_new_name_value;
4554
4555 /* Now replace the old value with new one. */
4556 if (local)
4557 xe->xe_value_size = cpu_to_le64(xi->value_len);
4558 else
4559 xe->xe_value_size = 0;
4560
4561 val = ocfs2_xattr_bucket_get_val(inode,
4562 xs->bucket, offs);
4563 memset(val + OCFS2_XATTR_SIZE(name_len), 0,
4564 size - OCFS2_XATTR_SIZE(name_len));
4565 if (OCFS2_XATTR_SIZE(xi->value_len) > 0)
4566 memcpy(val + OCFS2_XATTR_SIZE(name_len),
4567 xi->value, xi->value_len);
4568
4569 le16_add_cpu(&xh->xh_name_value_len, new_size);
4570 ocfs2_xattr_set_local(xe, local);
4571 return;
4572 } else {
4573 /*
4574 * Remove the old entry if there is more than one.
4575 * We don't remove the last entry so that we can
4576 * use it to indicate the hash value of the empty
4577 * bucket.
4578 */
4579 last -= 1;
4580 le16_add_cpu(&xh->xh_count, -1);
4581 if (xh->xh_count) {
4582 memmove(xe, xe + 1,
4583 (void *)last - (void *)xe);
4584 memset(last, 0,
4585 sizeof(struct ocfs2_xattr_entry));
4586 } else
4587 xh->xh_free_start =
4588 cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
4589
4590 return;
4591 }
4592 } else {
4593 /* find a new entry for insert. */
4594 int low = 0, high = count - 1, tmp;
4595 struct ocfs2_xattr_entry *tmp_xe;
4596
4597 while (low <= high && count) {
4598 tmp = (low + high) / 2;
4599 tmp_xe = &xh->xh_entries[tmp];
4600
4601 if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
4602 low = tmp + 1;
4603 else if (name_hash <
4604 le32_to_cpu(tmp_xe->xe_name_hash))
4605 high = tmp - 1;
4606 else {
4607 low = tmp;
4608 break;
4609 }
4610 }
4611
4612 xe = &xh->xh_entries[low];
4613 if (low != count)
4614 memmove(xe + 1, xe, (void *)last - (void *)xe);
4615
4616 le16_add_cpu(&xh->xh_count, 1);
4617 memset(xe, 0, sizeof(struct ocfs2_xattr_entry));
4618 xe->xe_name_hash = cpu_to_le32(name_hash);
4619 xe->xe_name_len = name_len;
4620 ocfs2_xattr_set_type(xe, xi->name_index);
4621 }
4622
4623 set_new_name_value:
4624 /* Insert the new name+value. */
4625 size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len);
4626
4627 /*
4628 * We must make sure that the name/value pair
4629 * exists in the same block.
4630 */
4631 offs = le16_to_cpu(xh->xh_free_start);
4632 start = offs - size;
4633
4634 if (start >> inode->i_sb->s_blocksize_bits !=
4635 (offs - 1) >> inode->i_sb->s_blocksize_bits) {
4636 offs = offs - offs % blocksize;
4637 xh->xh_free_start = cpu_to_le16(offs);
4638 }
4639
4640 val = ocfs2_xattr_bucket_get_val(inode, xs->bucket, offs - size);
4641 xe->xe_name_offset = cpu_to_le16(offs - size);
4642
4643 memset(val, 0, size);
4644 memcpy(val, xi->name, name_len);
4645 memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len);
4646
4647 xe->xe_value_size = cpu_to_le64(xi->value_len);
4648 ocfs2_xattr_set_local(xe, local);
4649 xs->here = xe;
4650 le16_add_cpu(&xh->xh_free_start, -size);
4651 le16_add_cpu(&xh->xh_name_value_len, size);
4652
4653 return;
4654 }
4655
4656 /*
4657 * Set the xattr entry in the specified bucket.
4658 * The bucket is indicated by xs->bucket and it should have the enough
4659 * space for the xattr insertion.
4660 */
4661 static int ocfs2_xattr_set_entry_in_bucket(struct inode *inode,
4662 handle_t *handle,
4663 struct ocfs2_xattr_info *xi,
4664 struct ocfs2_xattr_search *xs,
4665 u32 name_hash,
4666 int local)
4667 {
4668 int ret;
4669 u64 blkno;
4670
4671 mlog(0, "Set xattr entry len = %lu index = %d in bucket %llu\n",
4672 (unsigned long)xi->value_len, xi->name_index,
4673 (unsigned long long)bucket_blkno(xs->bucket));
4674
4675 if (!xs->bucket->bu_bhs[1]) {
4676 blkno = bucket_blkno(xs->bucket);
4677 ocfs2_xattr_bucket_relse(xs->bucket);
4678 ret = ocfs2_read_xattr_bucket(xs->bucket, blkno);
4679 if (ret) {
4680 mlog_errno(ret);
4681 goto out;
4682 }
4683 }
4684
4685 ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
4686 OCFS2_JOURNAL_ACCESS_WRITE);
4687 if (ret < 0) {
4688 mlog_errno(ret);
4689 goto out;
4690 }
4691
4692 ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash, local);
4693 ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
4694
4695 out:
4696 return ret;
4697 }
4698
4699 /*
4700 * Truncate the specified xe_off entry in xattr bucket.
4701 * bucket is indicated by header_bh and len is the new length.
4702 * Both the ocfs2_xattr_value_root and the entry will be updated here.
4703 *
4704 * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
4705 */
4706 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
4707 struct ocfs2_xattr_bucket *bucket,
4708 int xe_off,
4709 int len,
4710 struct ocfs2_xattr_set_ctxt *ctxt)
4711 {
4712 int ret, offset;
4713 u64 value_blk;
4714 struct ocfs2_xattr_entry *xe;
4715 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
4716 size_t blocksize = inode->i_sb->s_blocksize;
4717 struct ocfs2_xattr_value_buf vb = {
4718 .vb_access = ocfs2_journal_access,
4719 };
4720
4721 xe = &xh->xh_entries[xe_off];
4722
4723 BUG_ON(!xe || ocfs2_xattr_is_local(xe));
4724
4725 offset = le16_to_cpu(xe->xe_name_offset) +
4726 OCFS2_XATTR_SIZE(xe->xe_name_len);
4727
4728 value_blk = offset / blocksize;
4729
4730 /* We don't allow ocfs2_xattr_value to be stored in different block. */
4731 BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
4732
4733 vb.vb_bh = bucket->bu_bhs[value_blk];
4734 BUG_ON(!vb.vb_bh);
4735
4736 vb.vb_xv = (struct ocfs2_xattr_value_root *)
4737 (vb.vb_bh->b_data + offset % blocksize);
4738
4739 /*
4740 * From here on out we have to dirty the bucket. The generic
4741 * value calls only modify one of the bucket's bhs, but we need
4742 * to send the bucket at once. So if they error, they *could* have
4743 * modified something. We have to assume they did, and dirty
4744 * the whole bucket. This leaves us in a consistent state.
4745 */
4746 mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n",
4747 xe_off, (unsigned long long)bucket_blkno(bucket), len);
4748 ret = ocfs2_xattr_value_truncate(inode, &vb, len, ctxt);
4749 if (ret) {
4750 mlog_errno(ret);
4751 goto out;
4752 }
4753
4754 ret = ocfs2_xattr_bucket_journal_access(ctxt->handle, bucket,
4755 OCFS2_JOURNAL_ACCESS_WRITE);
4756 if (ret) {
4757 mlog_errno(ret);
4758 goto out;
4759 }
4760
4761 xe->xe_value_size = cpu_to_le64(len);
4762
4763 ocfs2_xattr_bucket_journal_dirty(ctxt->handle, bucket);
4764
4765 out:
4766 return ret;
4767 }
4768
4769 static int ocfs2_xattr_bucket_value_truncate_xs(struct inode *inode,
4770 struct ocfs2_xattr_search *xs,
4771 int len,
4772 struct ocfs2_xattr_set_ctxt *ctxt)
4773 {
4774 int ret, offset;
4775 struct ocfs2_xattr_entry *xe = xs->here;
4776 struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xs->base;
4777
4778 BUG_ON(!xs->bucket->bu_bhs[0] || !xe || ocfs2_xattr_is_local(xe));
4779
4780 offset = xe - xh->xh_entries;
4781 ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket,
4782 offset, len, ctxt);
4783 if (ret)
4784 mlog_errno(ret);
4785
4786 return ret;
4787 }
4788
4789 static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode,
4790 handle_t *handle,
4791 struct ocfs2_xattr_search *xs,
4792 char *val,
4793 int value_len)
4794 {
4795 int ret, offset, block_off;
4796 struct ocfs2_xattr_value_root *xv;
4797 struct ocfs2_xattr_entry *xe = xs->here;
4798 struct ocfs2_xattr_header *xh = bucket_xh(xs->bucket);
4799 void *base;
4800
4801 BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe));
4802
4803 ret = ocfs2_xattr_bucket_get_name_value(inode, xh,
4804 xe - xh->xh_entries,
4805 &block_off,
4806 &offset);
4807 if (ret) {
4808 mlog_errno(ret);
4809 goto out;
4810 }
4811
4812 base = bucket_block(xs->bucket, block_off);
4813 xv = (struct ocfs2_xattr_value_root *)(base + offset +
4814 OCFS2_XATTR_SIZE(xe->xe_name_len));
4815
4816 ret = __ocfs2_xattr_set_value_outside(inode, handle,
4817 xv, val, value_len);
4818 if (ret)
4819 mlog_errno(ret);
4820 out:
4821 return ret;
4822 }
4823
4824 static int ocfs2_rm_xattr_cluster(struct inode *inode,
4825 struct buffer_head *root_bh,
4826 u64 blkno,
4827 u32 cpos,
4828 u32 len)
4829 {
4830 int ret;
4831 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4832 struct inode *tl_inode = osb->osb_tl_inode;
4833 handle_t *handle;
4834 struct ocfs2_xattr_block *xb =
4835 (struct ocfs2_xattr_block *)root_bh->b_data;
4836 struct ocfs2_alloc_context *meta_ac = NULL;
4837 struct ocfs2_cached_dealloc_ctxt dealloc;
4838 struct ocfs2_extent_tree et;
4839
4840 ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
4841
4842 ocfs2_init_dealloc_ctxt(&dealloc);
4843
4844 mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n",
4845 cpos, len, (unsigned long long)blkno);
4846
4847 ocfs2_remove_xattr_clusters_from_cache(inode, blkno, len);
4848
4849 ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
4850 if (ret) {
4851 mlog_errno(ret);
4852 return ret;
4853 }
4854
4855 mutex_lock(&tl_inode->i_mutex);
4856
4857 if (ocfs2_truncate_log_needs_flush(osb)) {
4858 ret = __ocfs2_flush_truncate_log(osb);
4859 if (ret < 0) {
4860 mlog_errno(ret);
4861 goto out;
4862 }
4863 }
4864
4865 handle = ocfs2_start_trans(osb, ocfs2_remove_extent_credits(osb->sb));
4866 if (IS_ERR(handle)) {
4867 ret = -ENOMEM;
4868 mlog_errno(ret);
4869 goto out;
4870 }
4871
4872 ret = ocfs2_journal_access_xb(handle, inode, root_bh,
4873 OCFS2_JOURNAL_ACCESS_WRITE);
4874 if (ret) {
4875 mlog_errno(ret);
4876 goto out_commit;
4877 }
4878
4879 ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
4880 &dealloc);
4881 if (ret) {
4882 mlog_errno(ret);
4883 goto out_commit;
4884 }
4885
4886 le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
4887
4888 ret = ocfs2_journal_dirty(handle, root_bh);
4889 if (ret) {
4890 mlog_errno(ret);
4891 goto out_commit;
4892 }
4893
4894 ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
4895 if (ret)
4896 mlog_errno(ret);
4897
4898 out_commit:
4899 ocfs2_commit_trans(osb, handle);
4900 out:
4901 ocfs2_schedule_truncate_log_flush(osb, 1);
4902
4903 mutex_unlock(&tl_inode->i_mutex);
4904
4905 if (meta_ac)
4906 ocfs2_free_alloc_context(meta_ac);
4907
4908 ocfs2_run_deallocs(osb, &dealloc);
4909
4910 return ret;
4911 }
4912
4913 static void ocfs2_xattr_bucket_remove_xs(struct inode *inode,
4914 handle_t *handle,
4915 struct ocfs2_xattr_search *xs)
4916 {
4917 struct ocfs2_xattr_header *xh = bucket_xh(xs->bucket);
4918 struct ocfs2_xattr_entry *last = &xh->xh_entries[
4919 le16_to_cpu(xh->xh_count) - 1];
4920 int ret = 0;
4921
4922 ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
4923 OCFS2_JOURNAL_ACCESS_WRITE);
4924 if (ret) {
4925 mlog_errno(ret);
4926 return;
4927 }
4928
4929 /* Remove the old entry. */
4930 memmove(xs->here, xs->here + 1,
4931 (void *)last - (void *)xs->here);
4932 memset(last, 0, sizeof(struct ocfs2_xattr_entry));
4933 le16_add_cpu(&xh->xh_count, -1);
4934
4935 ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
4936 }
4937
4938 /*
4939 * Set the xattr name/value in the bucket specified in xs.
4940 *
4941 * As the new value in xi may be stored in the bucket or in an outside cluster,
4942 * we divide the whole process into 3 steps:
4943 * 1. insert name/value in the bucket(ocfs2_xattr_set_entry_in_bucket)
4944 * 2. truncate of the outside cluster(ocfs2_xattr_bucket_value_truncate_xs)
4945 * 3. Set the value to the outside cluster(ocfs2_xattr_bucket_set_value_outside)
4946 * 4. If the clusters for the new outside value can't be allocated, we need
4947 * to free the xattr we allocated in set.
4948 */
4949 static int ocfs2_xattr_set_in_bucket(struct inode *inode,
4950 struct ocfs2_xattr_info *xi,
4951 struct ocfs2_xattr_search *xs,
4952 struct ocfs2_xattr_set_ctxt *ctxt)
4953 {
4954 int ret, local = 1;
4955 size_t value_len;
4956 char *val = (char *)xi->value;
4957 struct ocfs2_xattr_entry *xe = xs->here;
4958 u32 name_hash = ocfs2_xattr_name_hash(inode, xi->name,
4959 strlen(xi->name));
4960
4961 if (!xs->not_found && !ocfs2_xattr_is_local(xe)) {
4962 /*
4963 * We need to truncate the xattr storage first.
4964 *
4965 * If both the old and new value are stored to
4966 * outside block, we only need to truncate
4967 * the storage and then set the value outside.
4968 *
4969 * If the new value should be stored within block,
4970 * we should free all the outside block first and
4971 * the modification to the xattr block will be done
4972 * by following steps.
4973 */
4974 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
4975 value_len = xi->value_len;
4976 else
4977 value_len = 0;
4978
4979 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
4980 value_len,
4981 ctxt);
4982 if (ret)
4983 goto out;
4984
4985 if (value_len)
4986 goto set_value_outside;
4987 }
4988
4989 value_len = xi->value_len;
4990 /* So we have to handle the inside block change now. */
4991 if (value_len > OCFS2_XATTR_INLINE_SIZE) {
4992 /*
4993 * If the new value will be stored outside of block,
4994 * initalize a new empty value root and insert it first.
4995 */
4996 local = 0;
4997 xi->value = &def_xv;
4998 xi->value_len = OCFS2_XATTR_ROOT_SIZE;
4999 }
5000
5001 ret = ocfs2_xattr_set_entry_in_bucket(inode, ctxt->handle, xi, xs,
5002 name_hash, local);
5003 if (ret) {
5004 mlog_errno(ret);
5005 goto out;
5006 }
5007
5008 if (value_len <= OCFS2_XATTR_INLINE_SIZE)
5009 goto out;
5010
5011 /* allocate the space now for the outside block storage. */
5012 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
5013 value_len, ctxt);
5014 if (ret) {
5015 mlog_errno(ret);
5016
5017 if (xs->not_found) {
5018 /*
5019 * We can't allocate enough clusters for outside
5020 * storage and we have allocated xattr already,
5021 * so need to remove it.
5022 */
5023 ocfs2_xattr_bucket_remove_xs(inode, ctxt->handle, xs);
5024 }
5025 goto out;
5026 }
5027
5028 set_value_outside:
5029 ret = ocfs2_xattr_bucket_set_value_outside(inode, ctxt->handle,
5030 xs, val, value_len);
5031 out:
5032 return ret;
5033 }
5034
5035 /*
5036 * check whether the xattr bucket is filled up with the same hash value.
5037 * If we want to insert the xattr with the same hash, return -ENOSPC.
5038 * If we want to insert a xattr with different hash value, go ahead
5039 * and ocfs2_divide_xattr_bucket will handle this.
5040 */
5041 static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
5042 struct ocfs2_xattr_bucket *bucket,
5043 const char *name)
5044 {
5045 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5046 u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
5047
5048 if (name_hash != le32_to_cpu(xh->xh_entries[0].xe_name_hash))
5049 return 0;
5050
5051 if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
5052 xh->xh_entries[0].xe_name_hash) {
5053 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
5054 "hash = %u\n",
5055 (unsigned long long)bucket_blkno(bucket),
5056 le32_to_cpu(xh->xh_entries[0].xe_name_hash));
5057 return -ENOSPC;
5058 }
5059
5060 return 0;
5061 }
5062
5063 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
5064 struct ocfs2_xattr_info *xi,
5065 struct ocfs2_xattr_search *xs,
5066 struct ocfs2_xattr_set_ctxt *ctxt)
5067 {
5068 struct ocfs2_xattr_header *xh;
5069 struct ocfs2_xattr_entry *xe;
5070 u16 count, header_size, xh_free_start;
5071 int free, max_free, need, old;
5072 size_t value_size = 0, name_len = strlen(xi->name);
5073 size_t blocksize = inode->i_sb->s_blocksize;
5074 int ret, allocation = 0;
5075
5076 mlog_entry("Set xattr %s in xattr index block\n", xi->name);
5077
5078 try_again:
5079 xh = xs->header;
5080 count = le16_to_cpu(xh->xh_count);
5081 xh_free_start = le16_to_cpu(xh->xh_free_start);
5082 header_size = sizeof(struct ocfs2_xattr_header) +
5083 count * sizeof(struct ocfs2_xattr_entry);
5084 max_free = OCFS2_XATTR_BUCKET_SIZE - header_size -
5085 le16_to_cpu(xh->xh_name_value_len) - OCFS2_XATTR_HEADER_GAP;
5086
5087 mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size "
5088 "of %u which exceed block size\n",
5089 (unsigned long long)bucket_blkno(xs->bucket),
5090 header_size);
5091
5092 if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE)
5093 value_size = OCFS2_XATTR_ROOT_SIZE;
5094 else if (xi->value)
5095 value_size = OCFS2_XATTR_SIZE(xi->value_len);
5096
5097 if (xs->not_found)
5098 need = sizeof(struct ocfs2_xattr_entry) +
5099 OCFS2_XATTR_SIZE(name_len) + value_size;
5100 else {
5101 need = value_size + OCFS2_XATTR_SIZE(name_len);
5102
5103 /*
5104 * We only replace the old value if the new length is smaller
5105 * than the old one. Otherwise we will allocate new space in the
5106 * bucket to store it.
5107 */
5108 xe = xs->here;
5109 if (ocfs2_xattr_is_local(xe))
5110 old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
5111 else
5112 old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
5113
5114 if (old >= value_size)
5115 need = 0;
5116 }
5117
5118 free = xh_free_start - header_size - OCFS2_XATTR_HEADER_GAP;
5119 /*
5120 * We need to make sure the new name/value pair
5121 * can exist in the same block.
5122 */
5123 if (xh_free_start % blocksize < need)
5124 free -= xh_free_start % blocksize;
5125
5126 mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, "
5127 "need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len ="
5128 " %u\n", xs->not_found,
5129 (unsigned long long)bucket_blkno(xs->bucket),
5130 free, need, max_free, le16_to_cpu(xh->xh_free_start),
5131 le16_to_cpu(xh->xh_name_value_len));
5132
5133 if (free < need ||
5134 (xs->not_found &&
5135 count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb))) {
5136 if (need <= max_free &&
5137 count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
5138 /*
5139 * We can create the space by defragment. Since only the
5140 * name/value will be moved, the xe shouldn't be changed
5141 * in xs.
5142 */
5143 ret = ocfs2_defrag_xattr_bucket(inode, ctxt->handle,
5144 xs->bucket);
5145 if (ret) {
5146 mlog_errno(ret);
5147 goto out;
5148 }
5149
5150 xh_free_start = le16_to_cpu(xh->xh_free_start);
5151 free = xh_free_start - header_size
5152 - OCFS2_XATTR_HEADER_GAP;
5153 if (xh_free_start % blocksize < need)
5154 free -= xh_free_start % blocksize;
5155
5156 if (free >= need)
5157 goto xattr_set;
5158
5159 mlog(0, "Can't get enough space for xattr insert by "
5160 "defragment. Need %u bytes, but we have %d, so "
5161 "allocate new bucket for it.\n", need, free);
5162 }
5163
5164 /*
5165 * We have to add new buckets or clusters and one
5166 * allocation should leave us enough space for insert.
5167 */
5168 BUG_ON(allocation);
5169
5170 /*
5171 * We do not allow for overlapping ranges between buckets. And
5172 * the maximum number of collisions we will allow for then is
5173 * one bucket's worth, so check it here whether we need to
5174 * add a new bucket for the insert.
5175 */
5176 ret = ocfs2_check_xattr_bucket_collision(inode,
5177 xs->bucket,
5178 xi->name);
5179 if (ret) {
5180 mlog_errno(ret);
5181 goto out;
5182 }
5183
5184 ret = ocfs2_add_new_xattr_bucket(inode,
5185 xs->xattr_bh,
5186 xs->bucket,
5187 ctxt);
5188 if (ret) {
5189 mlog_errno(ret);
5190 goto out;
5191 }
5192
5193 /*
5194 * ocfs2_add_new_xattr_bucket() will have updated
5195 * xs->bucket if it moved, but it will not have updated
5196 * any of the other search fields. Thus, we drop it and
5197 * re-search. Everything should be cached, so it'll be
5198 * quick.
5199 */
5200 ocfs2_xattr_bucket_relse(xs->bucket);
5201 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
5202 xi->name_index,
5203 xi->name, xs);
5204 if (ret && ret != -ENODATA)
5205 goto out;
5206 xs->not_found = ret;
5207 allocation = 1;
5208 goto try_again;
5209 }
5210
5211 xattr_set:
5212 ret = ocfs2_xattr_set_in_bucket(inode, xi, xs, ctxt);
5213 out:
5214 mlog_exit(ret);
5215 return ret;
5216 }
5217
5218 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
5219 struct ocfs2_xattr_bucket *bucket,
5220 void *para)
5221 {
5222 int ret = 0;
5223 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5224 u16 i;
5225 struct ocfs2_xattr_entry *xe;
5226 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5227 struct ocfs2_xattr_set_ctxt ctxt = {NULL, NULL,};
5228 int credits = ocfs2_remove_extent_credits(osb->sb) +
5229 ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5230
5231
5232 ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
5233
5234 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
5235 xe = &xh->xh_entries[i];
5236 if (ocfs2_xattr_is_local(xe))
5237 continue;
5238
5239 ctxt.handle = ocfs2_start_trans(osb, credits);
5240 if (IS_ERR(ctxt.handle)) {
5241 ret = PTR_ERR(ctxt.handle);
5242 mlog_errno(ret);
5243 break;
5244 }
5245
5246 ret = ocfs2_xattr_bucket_value_truncate(inode, bucket,
5247 i, 0, &ctxt);
5248
5249 ocfs2_commit_trans(osb, ctxt.handle);
5250 if (ret) {
5251 mlog_errno(ret);
5252 break;
5253 }
5254 }
5255
5256 ocfs2_schedule_truncate_log_flush(osb, 1);
5257 ocfs2_run_deallocs(osb, &ctxt.dealloc);
5258 return ret;
5259 }
5260
5261 static int ocfs2_delete_xattr_index_block(struct inode *inode,
5262 struct buffer_head *xb_bh)
5263 {
5264 struct ocfs2_xattr_block *xb =
5265 (struct ocfs2_xattr_block *)xb_bh->b_data;
5266 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
5267 int ret = 0;
5268 u32 name_hash = UINT_MAX, e_cpos, num_clusters;
5269 u64 p_blkno;
5270
5271 if (le16_to_cpu(el->l_next_free_rec) == 0)
5272 return 0;
5273
5274 while (name_hash > 0) {
5275 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
5276 &e_cpos, &num_clusters, el);
5277 if (ret) {
5278 mlog_errno(ret);
5279 goto out;
5280 }
5281
5282 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
5283 ocfs2_delete_xattr_in_bucket,
5284 NULL);
5285 if (ret) {
5286 mlog_errno(ret);
5287 goto out;
5288 }
5289
5290 ret = ocfs2_rm_xattr_cluster(inode, xb_bh,
5291 p_blkno, e_cpos, num_clusters);
5292 if (ret) {
5293 mlog_errno(ret);
5294 break;
5295 }
5296
5297 if (e_cpos == 0)
5298 break;
5299
5300 name_hash = e_cpos - 1;
5301 }
5302
5303 out:
5304 return ret;
5305 }
5306
5307 /*
5308 * 'security' attributes support
5309 */
5310 static size_t ocfs2_xattr_security_list(struct inode *inode, char *list,
5311 size_t list_size, const char *name,
5312 size_t name_len)
5313 {
5314 const size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
5315 const size_t total_len = prefix_len + name_len + 1;
5316
5317 if (list && total_len <= list_size) {
5318 memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
5319 memcpy(list + prefix_len, name, name_len);
5320 list[prefix_len + name_len] = '\0';
5321 }
5322 return total_len;
5323 }
5324
5325 static int ocfs2_xattr_security_get(struct inode *inode, const char *name,
5326 void *buffer, size_t size)
5327 {
5328 if (strcmp(name, "") == 0)
5329 return -EINVAL;
5330 return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_SECURITY, name,
5331 buffer, size);
5332 }
5333
5334 static int ocfs2_xattr_security_set(struct inode *inode, const char *name,
5335 const void *value, size_t size, int flags)
5336 {
5337 if (strcmp(name, "") == 0)
5338 return -EINVAL;
5339
5340 return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_SECURITY, name, value,
5341 size, flags);
5342 }
5343
5344 int ocfs2_init_security_get(struct inode *inode,
5345 struct inode *dir,
5346 struct ocfs2_security_xattr_info *si)
5347 {
5348 /* check whether ocfs2 support feature xattr */
5349 if (!ocfs2_supports_xattr(OCFS2_SB(dir->i_sb)))
5350 return -EOPNOTSUPP;
5351 return security_inode_init_security(inode, dir, &si->name, &si->value,
5352 &si->value_len);
5353 }
5354
5355 int ocfs2_init_security_set(handle_t *handle,
5356 struct inode *inode,
5357 struct buffer_head *di_bh,
5358 struct ocfs2_security_xattr_info *si,
5359 struct ocfs2_alloc_context *xattr_ac,
5360 struct ocfs2_alloc_context *data_ac)
5361 {
5362 return ocfs2_xattr_set_handle(handle, inode, di_bh,
5363 OCFS2_XATTR_INDEX_SECURITY,
5364 si->name, si->value, si->value_len, 0,
5365 xattr_ac, data_ac);
5366 }
5367
5368 struct xattr_handler ocfs2_xattr_security_handler = {
5369 .prefix = XATTR_SECURITY_PREFIX,
5370 .list = ocfs2_xattr_security_list,
5371 .get = ocfs2_xattr_security_get,
5372 .set = ocfs2_xattr_security_set,
5373 };
5374
5375 /*
5376 * 'trusted' attributes support
5377 */
5378 static size_t ocfs2_xattr_trusted_list(struct inode *inode, char *list,
5379 size_t list_size, const char *name,
5380 size_t name_len)
5381 {
5382 const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
5383 const size_t total_len = prefix_len + name_len + 1;
5384
5385 if (list && total_len <= list_size) {
5386 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
5387 memcpy(list + prefix_len, name, name_len);
5388 list[prefix_len + name_len] = '\0';
5389 }
5390 return total_len;
5391 }
5392
5393 static int ocfs2_xattr_trusted_get(struct inode *inode, const char *name,
5394 void *buffer, size_t size)
5395 {
5396 if (strcmp(name, "") == 0)
5397 return -EINVAL;
5398 return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_TRUSTED, name,
5399 buffer, size);
5400 }
5401
5402 static int ocfs2_xattr_trusted_set(struct inode *inode, const char *name,
5403 const void *value, size_t size, int flags)
5404 {
5405 if (strcmp(name, "") == 0)
5406 return -EINVAL;
5407
5408 return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_TRUSTED, name, value,
5409 size, flags);
5410 }
5411
5412 struct xattr_handler ocfs2_xattr_trusted_handler = {
5413 .prefix = XATTR_TRUSTED_PREFIX,
5414 .list = ocfs2_xattr_trusted_list,
5415 .get = ocfs2_xattr_trusted_get,
5416 .set = ocfs2_xattr_trusted_set,
5417 };
5418
5419 /*
5420 * 'user' attributes support
5421 */
5422 static size_t ocfs2_xattr_user_list(struct inode *inode, char *list,
5423 size_t list_size, const char *name,
5424 size_t name_len)
5425 {
5426 const size_t prefix_len = XATTR_USER_PREFIX_LEN;
5427 const size_t total_len = prefix_len + name_len + 1;
5428 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5429
5430 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
5431 return 0;
5432
5433 if (list && total_len <= list_size) {
5434 memcpy(list, XATTR_USER_PREFIX, prefix_len);
5435 memcpy(list + prefix_len, name, name_len);
5436 list[prefix_len + name_len] = '\0';
5437 }
5438 return total_len;
5439 }
5440
5441 static int ocfs2_xattr_user_get(struct inode *inode, const char *name,
5442 void *buffer, size_t size)
5443 {
5444 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5445
5446 if (strcmp(name, "") == 0)
5447 return -EINVAL;
5448 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
5449 return -EOPNOTSUPP;
5450 return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_USER, name,
5451 buffer, size);
5452 }
5453
5454 static int ocfs2_xattr_user_set(struct inode *inode, const char *name,
5455 const void *value, size_t size, int flags)
5456 {
5457 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5458
5459 if (strcmp(name, "") == 0)
5460 return -EINVAL;
5461 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
5462 return -EOPNOTSUPP;
5463
5464 return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_USER, name, value,
5465 size, flags);
5466 }
5467
5468 struct xattr_handler ocfs2_xattr_user_handler = {
5469 .prefix = XATTR_USER_PREFIX,
5470 .list = ocfs2_xattr_user_list,
5471 .get = ocfs2_xattr_user_get,
5472 .set = ocfs2_xattr_user_set,
5473 };
Linux kernel - Deliverables
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