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Linux 2.6.28.1
[linux/fpc-iii.git] / fs / ocfs2 / xattr.c
blob74d7367ade13e1e36cb74a13327ca65573fabf86
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
39 #define MLOG_MASK_PREFIX ML_XATTR
40 #include <cluster/masklog.h>
41
42 #include "ocfs2.h"
43 #include "alloc.h"
44 #include "dlmglue.h"
45 #include "file.h"
46 #include "symlink.h"
47 #include "sysfile.h"
48 #include "inode.h"
49 #include "journal.h"
50 #include "ocfs2_fs.h"
51 #include "suballoc.h"
52 #include "uptodate.h"
53 #include "buffer_head_io.h"
54 #include "super.h"
55 #include "xattr.h"
56
57
58 struct ocfs2_xattr_def_value_root {
59 struct ocfs2_xattr_value_root xv;
60 struct ocfs2_extent_rec er;
61 };
62
63 struct ocfs2_xattr_bucket {
64 struct buffer_head *bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET];
65 struct ocfs2_xattr_header *xh;
66 };
67
68 #define OCFS2_XATTR_ROOT_SIZE (sizeof(struct ocfs2_xattr_def_value_root))
69 #define OCFS2_XATTR_INLINE_SIZE 80
70
71 static struct ocfs2_xattr_def_value_root def_xv = {
72 .xv.xr_list.l_count = cpu_to_le16(1),
73 };
74
75 struct xattr_handler *ocfs2_xattr_handlers[] = {
76 &ocfs2_xattr_user_handler,
77 &ocfs2_xattr_trusted_handler,
78 NULL
79 };
80
81 static struct xattr_handler *ocfs2_xattr_handler_map[OCFS2_XATTR_MAX] = {
82 [OCFS2_XATTR_INDEX_USER] = &ocfs2_xattr_user_handler,
83 [OCFS2_XATTR_INDEX_TRUSTED] = &ocfs2_xattr_trusted_handler,
84 };
85
86 struct ocfs2_xattr_info {
87 int name_index;
88 const char *name;
89 const void *value;
90 size_t value_len;
91 };
92
93 struct ocfs2_xattr_search {
94 struct buffer_head *inode_bh;
95 /*
96 * xattr_bh point to the block buffer head which has extended attribute
97 * when extended attribute in inode, xattr_bh is equal to inode_bh.
98 */
99 struct buffer_head *xattr_bh;
100 struct ocfs2_xattr_header *header;
101 struct ocfs2_xattr_bucket bucket;
102 void *base;
103 void *end;
104 struct ocfs2_xattr_entry *here;
105 int not_found;
106 };
107
108 static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
109 struct ocfs2_xattr_header *xh,
110 int index,
111 int *block_off,
112 int *new_offset);
113
114 static int ocfs2_xattr_block_find(struct inode *inode,
115 int name_index,
116 const char *name,
117 struct ocfs2_xattr_search *xs);
118 static int ocfs2_xattr_index_block_find(struct inode *inode,
119 struct buffer_head *root_bh,
120 int name_index,
121 const char *name,
122 struct ocfs2_xattr_search *xs);
123
124 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
125 struct ocfs2_xattr_tree_root *xt,
126 char *buffer,
127 size_t buffer_size);
128
129 static int ocfs2_xattr_create_index_block(struct inode *inode,
130 struct ocfs2_xattr_search *xs);
131
132 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
133 struct ocfs2_xattr_info *xi,
134 struct ocfs2_xattr_search *xs);
135
136 static int ocfs2_delete_xattr_index_block(struct inode *inode,
137 struct buffer_head *xb_bh);
138
139 static inline u16 ocfs2_xattr_buckets_per_cluster(struct ocfs2_super *osb)
140 {
141 return (1 << osb->s_clustersize_bits) / OCFS2_XATTR_BUCKET_SIZE;
142 }
143
144 static inline u16 ocfs2_blocks_per_xattr_bucket(struct super_block *sb)
145 {
146 return OCFS2_XATTR_BUCKET_SIZE / (1 << sb->s_blocksize_bits);
147 }
148
149 static inline u16 ocfs2_xattr_max_xe_in_bucket(struct super_block *sb)
150 {
151 u16 len = sb->s_blocksize -
152 offsetof(struct ocfs2_xattr_header, xh_entries);
153
154 return len / sizeof(struct ocfs2_xattr_entry);
155 }
156
157 static inline const char *ocfs2_xattr_prefix(int name_index)
158 {
159 struct xattr_handler *handler = NULL;
160
161 if (name_index > 0 && name_index < OCFS2_XATTR_MAX)
162 handler = ocfs2_xattr_handler_map[name_index];
163
164 return handler ? handler->prefix : NULL;
165 }
166
167 static u32 ocfs2_xattr_name_hash(struct inode *inode,
168 const char *name,
169 int name_len)
170 {
171 /* Get hash value of uuid from super block */
172 u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash;
173 int i;
174
175 /* hash extended attribute name */
176 for (i = 0; i < name_len; i++) {
177 hash = (hash << OCFS2_HASH_SHIFT) ^
178 (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
179 *name++;
180 }
181
182 return hash;
183 }
184
185 /*
186 * ocfs2_xattr_hash_entry()
187 *
188 * Compute the hash of an extended attribute.
189 */
190 static void ocfs2_xattr_hash_entry(struct inode *inode,
191 struct ocfs2_xattr_header *header,
192 struct ocfs2_xattr_entry *entry)
193 {
194 u32 hash = 0;
195 char *name = (char *)header + le16_to_cpu(entry->xe_name_offset);
196
197 hash = ocfs2_xattr_name_hash(inode, name, entry->xe_name_len);
198 entry->xe_name_hash = cpu_to_le32(hash);
199
200 return;
201 }
202
203 static int ocfs2_xattr_extend_allocation(struct inode *inode,
204 u32 clusters_to_add,
205 struct buffer_head *xattr_bh,
206 struct ocfs2_xattr_value_root *xv)
207 {
208 int status = 0;
209 int restart_func = 0;
210 int credits = 0;
211 handle_t *handle = NULL;
212 struct ocfs2_alloc_context *data_ac = NULL;
213 struct ocfs2_alloc_context *meta_ac = NULL;
214 enum ocfs2_alloc_restarted why;
215 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
216 u32 prev_clusters, logical_start = le32_to_cpu(xv->xr_clusters);
217 struct ocfs2_extent_tree et;
218
219 mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add);
220
221 ocfs2_init_xattr_value_extent_tree(&et, inode, xattr_bh, xv);
222
223 restart_all:
224
225 status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
226 &data_ac, &meta_ac);
227 if (status) {
228 mlog_errno(status);
229 goto leave;
230 }
231
232 credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el,
233 clusters_to_add);
234 handle = ocfs2_start_trans(osb, credits);
235 if (IS_ERR(handle)) {
236 status = PTR_ERR(handle);
237 handle = NULL;
238 mlog_errno(status);
239 goto leave;
240 }
241
242 restarted_transaction:
243 status = ocfs2_journal_access(handle, inode, xattr_bh,
244 OCFS2_JOURNAL_ACCESS_WRITE);
245 if (status < 0) {
246 mlog_errno(status);
247 goto leave;
248 }
249
250 prev_clusters = le32_to_cpu(xv->xr_clusters);
251 status = ocfs2_add_clusters_in_btree(osb,
252 inode,
253 &logical_start,
254 clusters_to_add,
255 0,
256 &et,
257 handle,
258 data_ac,
259 meta_ac,
260 &why);
261 if ((status < 0) && (status != -EAGAIN)) {
262 if (status != -ENOSPC)
263 mlog_errno(status);
264 goto leave;
265 }
266
267 status = ocfs2_journal_dirty(handle, xattr_bh);
268 if (status < 0) {
269 mlog_errno(status);
270 goto leave;
271 }
272
273 clusters_to_add -= le32_to_cpu(xv->xr_clusters) - prev_clusters;
274
275 if (why != RESTART_NONE && clusters_to_add) {
276 if (why == RESTART_META) {
277 mlog(0, "restarting function.\n");
278 restart_func = 1;
279 } else {
280 BUG_ON(why != RESTART_TRANS);
281
282 mlog(0, "restarting transaction.\n");
283 /* TODO: This can be more intelligent. */
284 credits = ocfs2_calc_extend_credits(osb->sb,
285 et.et_root_el,
286 clusters_to_add);
287 status = ocfs2_extend_trans(handle, credits);
288 if (status < 0) {
289 /* handle still has to be committed at
290 * this point. */
291 status = -ENOMEM;
292 mlog_errno(status);
293 goto leave;
294 }
295 goto restarted_transaction;
296 }
297 }
298
299 leave:
300 if (handle) {
301 ocfs2_commit_trans(osb, handle);
302 handle = NULL;
303 }
304 if (data_ac) {
305 ocfs2_free_alloc_context(data_ac);
306 data_ac = NULL;
307 }
308 if (meta_ac) {
309 ocfs2_free_alloc_context(meta_ac);
310 meta_ac = NULL;
311 }
312 if ((!status) && restart_func) {
313 restart_func = 0;
314 goto restart_all;
315 }
316
317 return status;
318 }
319
320 static int __ocfs2_remove_xattr_range(struct inode *inode,
321 struct buffer_head *root_bh,
322 struct ocfs2_xattr_value_root *xv,
323 u32 cpos, u32 phys_cpos, u32 len,
324 struct ocfs2_cached_dealloc_ctxt *dealloc)
325 {
326 int ret;
327 u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
328 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
329 struct inode *tl_inode = osb->osb_tl_inode;
330 handle_t *handle;
331 struct ocfs2_alloc_context *meta_ac = NULL;
332 struct ocfs2_extent_tree et;
333
334 ocfs2_init_xattr_value_extent_tree(&et, inode, root_bh, xv);
335
336 ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
337 if (ret) {
338 mlog_errno(ret);
339 return ret;
340 }
341
342 mutex_lock(&tl_inode->i_mutex);
343
344 if (ocfs2_truncate_log_needs_flush(osb)) {
345 ret = __ocfs2_flush_truncate_log(osb);
346 if (ret < 0) {
347 mlog_errno(ret);
348 goto out;
349 }
350 }
351
352 handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
353 if (IS_ERR(handle)) {
354 ret = PTR_ERR(handle);
355 mlog_errno(ret);
356 goto out;
357 }
358
359 ret = ocfs2_journal_access(handle, inode, root_bh,
360 OCFS2_JOURNAL_ACCESS_WRITE);
361 if (ret) {
362 mlog_errno(ret);
363 goto out_commit;
364 }
365
366 ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
367 dealloc);
368 if (ret) {
369 mlog_errno(ret);
370 goto out_commit;
371 }
372
373 le32_add_cpu(&xv->xr_clusters, -len);
374
375 ret = ocfs2_journal_dirty(handle, root_bh);
376 if (ret) {
377 mlog_errno(ret);
378 goto out_commit;
379 }
380
381 ret = ocfs2_truncate_log_append(osb, handle, phys_blkno, len);
382 if (ret)
383 mlog_errno(ret);
384
385 out_commit:
386 ocfs2_commit_trans(osb, handle);
387 out:
388 mutex_unlock(&tl_inode->i_mutex);
389
390 if (meta_ac)
391 ocfs2_free_alloc_context(meta_ac);
392
393 return ret;
394 }
395
396 static int ocfs2_xattr_shrink_size(struct inode *inode,
397 u32 old_clusters,
398 u32 new_clusters,
399 struct buffer_head *root_bh,
400 struct ocfs2_xattr_value_root *xv)
401 {
402 int ret = 0;
403 u32 trunc_len, cpos, phys_cpos, alloc_size;
404 u64 block;
405 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
406 struct ocfs2_cached_dealloc_ctxt dealloc;
407
408 ocfs2_init_dealloc_ctxt(&dealloc);
409
410 if (old_clusters <= new_clusters)
411 return 0;
412
413 cpos = new_clusters;
414 trunc_len = old_clusters - new_clusters;
415 while (trunc_len) {
416 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
417 &alloc_size, &xv->xr_list);
418 if (ret) {
419 mlog_errno(ret);
420 goto out;
421 }
422
423 if (alloc_size > trunc_len)
424 alloc_size = trunc_len;
425
426 ret = __ocfs2_remove_xattr_range(inode, root_bh, xv, cpos,
427 phys_cpos, alloc_size,
428 &dealloc);
429 if (ret) {
430 mlog_errno(ret);
431 goto out;
432 }
433
434 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
435 ocfs2_remove_xattr_clusters_from_cache(inode, block,
436 alloc_size);
437 cpos += alloc_size;
438 trunc_len -= alloc_size;
439 }
440
441 out:
442 ocfs2_schedule_truncate_log_flush(osb, 1);
443 ocfs2_run_deallocs(osb, &dealloc);
444
445 return ret;
446 }
447
448 static int ocfs2_xattr_value_truncate(struct inode *inode,
449 struct buffer_head *root_bh,
450 struct ocfs2_xattr_value_root *xv,
451 int len)
452 {
453 int ret;
454 u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
455 u32 old_clusters = le32_to_cpu(xv->xr_clusters);
456
457 if (new_clusters == old_clusters)
458 return 0;
459
460 if (new_clusters > old_clusters)
461 ret = ocfs2_xattr_extend_allocation(inode,
462 new_clusters - old_clusters,
463 root_bh, xv);
464 else
465 ret = ocfs2_xattr_shrink_size(inode,
466 old_clusters, new_clusters,
467 root_bh, xv);
468
469 return ret;
470 }
471
472 static int ocfs2_xattr_list_entry(char *buffer, size_t size,
473 size_t *result, const char *prefix,
474 const char *name, int name_len)
475 {
476 char *p = buffer + *result;
477 int prefix_len = strlen(prefix);
478 int total_len = prefix_len + name_len + 1;
479
480 *result += total_len;
481
482 /* we are just looking for how big our buffer needs to be */
483 if (!size)
484 return 0;
485
486 if (*result > size)
487 return -ERANGE;
488
489 memcpy(p, prefix, prefix_len);
490 memcpy(p + prefix_len, name, name_len);
491 p[prefix_len + name_len] = '\0';
492
493 return 0;
494 }
495
496 static int ocfs2_xattr_list_entries(struct inode *inode,
497 struct ocfs2_xattr_header *header,
498 char *buffer, size_t buffer_size)
499 {
500 size_t result = 0;
501 int i, type, ret;
502 const char *prefix, *name;
503
504 for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
505 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
506 type = ocfs2_xattr_get_type(entry);
507 prefix = ocfs2_xattr_prefix(type);
508
509 if (prefix) {
510 name = (const char *)header +
511 le16_to_cpu(entry->xe_name_offset);
512
513 ret = ocfs2_xattr_list_entry(buffer, buffer_size,
514 &result, prefix, name,
515 entry->xe_name_len);
516 if (ret)
517 return ret;
518 }
519 }
520
521 return result;
522 }
523
524 static int ocfs2_xattr_ibody_list(struct inode *inode,
525 struct ocfs2_dinode *di,
526 char *buffer,
527 size_t buffer_size)
528 {
529 struct ocfs2_xattr_header *header = NULL;
530 struct ocfs2_inode_info *oi = OCFS2_I(inode);
531 int ret = 0;
532
533 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
534 return ret;
535
536 header = (struct ocfs2_xattr_header *)
537 ((void *)di + inode->i_sb->s_blocksize -
538 le16_to_cpu(di->i_xattr_inline_size));
539
540 ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size);
541
542 return ret;
543 }
544
545 static int ocfs2_xattr_block_list(struct inode *inode,
546 struct ocfs2_dinode *di,
547 char *buffer,
548 size_t buffer_size)
549 {
550 struct buffer_head *blk_bh = NULL;
551 struct ocfs2_xattr_block *xb;
552 int ret = 0;
553
554 if (!di->i_xattr_loc)
555 return ret;
556
557 ret = ocfs2_read_block(inode, le64_to_cpu(di->i_xattr_loc), &blk_bh);
558 if (ret < 0) {
559 mlog_errno(ret);
560 return ret;
561 }
562
563 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
564 if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
565 ret = -EIO;
566 goto cleanup;
567 }
568
569 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
570 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
571 ret = ocfs2_xattr_list_entries(inode, header,
572 buffer, buffer_size);
573 } else {
574 struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root;
575 ret = ocfs2_xattr_tree_list_index_block(inode, xt,
576 buffer, buffer_size);
577 }
578 cleanup:
579 brelse(blk_bh);
580
581 return ret;
582 }
583
584 ssize_t ocfs2_listxattr(struct dentry *dentry,
585 char *buffer,
586 size_t size)
587 {
588 int ret = 0, i_ret = 0, b_ret = 0;
589 struct buffer_head *di_bh = NULL;
590 struct ocfs2_dinode *di = NULL;
591 struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode);
592
593 if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
594 return -EOPNOTSUPP;
595
596 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
597 return ret;
598
599 ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0);
600 if (ret < 0) {
601 mlog_errno(ret);
602 return ret;
603 }
604
605 di = (struct ocfs2_dinode *)di_bh->b_data;
606
607 down_read(&oi->ip_xattr_sem);
608 i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size);
609 if (i_ret < 0)
610 b_ret = 0;
611 else {
612 if (buffer) {
613 buffer += i_ret;
614 size -= i_ret;
615 }
616 b_ret = ocfs2_xattr_block_list(dentry->d_inode, di,
617 buffer, size);
618 if (b_ret < 0)
619 i_ret = 0;
620 }
621 up_read(&oi->ip_xattr_sem);
622 ocfs2_inode_unlock(dentry->d_inode, 0);
623
624 brelse(di_bh);
625
626 return i_ret + b_ret;
627 }
628
629 static int ocfs2_xattr_find_entry(int name_index,
630 const char *name,
631 struct ocfs2_xattr_search *xs)
632 {
633 struct ocfs2_xattr_entry *entry;
634 size_t name_len;
635 int i, cmp = 1;
636
637 if (name == NULL)
638 return -EINVAL;
639
640 name_len = strlen(name);
641 entry = xs->here;
642 for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
643 cmp = name_index - ocfs2_xattr_get_type(entry);
644 if (!cmp)
645 cmp = name_len - entry->xe_name_len;
646 if (!cmp)
647 cmp = memcmp(name, (xs->base +
648 le16_to_cpu(entry->xe_name_offset)),
649 name_len);
650 if (cmp == 0)
651 break;
652 entry += 1;
653 }
654 xs->here = entry;
655
656 return cmp ? -ENODATA : 0;
657 }
658
659 static int ocfs2_xattr_get_value_outside(struct inode *inode,
660 struct ocfs2_xattr_value_root *xv,
661 void *buffer,
662 size_t len)
663 {
664 u32 cpos, p_cluster, num_clusters, bpc, clusters;
665 u64 blkno;
666 int i, ret = 0;
667 size_t cplen, blocksize;
668 struct buffer_head *bh = NULL;
669 struct ocfs2_extent_list *el;
670
671 el = &xv->xr_list;
672 clusters = le32_to_cpu(xv->xr_clusters);
673 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
674 blocksize = inode->i_sb->s_blocksize;
675
676 cpos = 0;
677 while (cpos < clusters) {
678 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
679 &num_clusters, el);
680 if (ret) {
681 mlog_errno(ret);
682 goto out;
683 }
684
685 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
686 /* Copy ocfs2_xattr_value */
687 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
688 ret = ocfs2_read_block(inode, blkno, &bh);
689 if (ret) {
690 mlog_errno(ret);
691 goto out;
692 }
693
694 cplen = len >= blocksize ? blocksize : len;
695 memcpy(buffer, bh->b_data, cplen);
696 len -= cplen;
697 buffer += cplen;
698
699 brelse(bh);
700 bh = NULL;
701 if (len == 0)
702 break;
703 }
704 cpos += num_clusters;
705 }
706 out:
707 return ret;
708 }
709
710 static int ocfs2_xattr_ibody_get(struct inode *inode,
711 int name_index,
712 const char *name,
713 void *buffer,
714 size_t buffer_size,
715 struct ocfs2_xattr_search *xs)
716 {
717 struct ocfs2_inode_info *oi = OCFS2_I(inode);
718 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
719 struct ocfs2_xattr_value_root *xv;
720 size_t size;
721 int ret = 0;
722
723 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
724 return -ENODATA;
725
726 xs->end = (void *)di + inode->i_sb->s_blocksize;
727 xs->header = (struct ocfs2_xattr_header *)
728 (xs->end - le16_to_cpu(di->i_xattr_inline_size));
729 xs->base = (void *)xs->header;
730 xs->here = xs->header->xh_entries;
731
732 ret = ocfs2_xattr_find_entry(name_index, name, xs);
733 if (ret)
734 return ret;
735 size = le64_to_cpu(xs->here->xe_value_size);
736 if (buffer) {
737 if (size > buffer_size)
738 return -ERANGE;
739 if (ocfs2_xattr_is_local(xs->here)) {
740 memcpy(buffer, (void *)xs->base +
741 le16_to_cpu(xs->here->xe_name_offset) +
742 OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
743 } else {
744 xv = (struct ocfs2_xattr_value_root *)
745 (xs->base + le16_to_cpu(
746 xs->here->xe_name_offset) +
747 OCFS2_XATTR_SIZE(xs->here->xe_name_len));
748 ret = ocfs2_xattr_get_value_outside(inode, xv,
749 buffer, size);
750 if (ret < 0) {
751 mlog_errno(ret);
752 return ret;
753 }
754 }
755 }
756
757 return size;
758 }
759
760 static int ocfs2_xattr_block_get(struct inode *inode,
761 int name_index,
762 const char *name,
763 void *buffer,
764 size_t buffer_size,
765 struct ocfs2_xattr_search *xs)
766 {
767 struct ocfs2_xattr_block *xb;
768 struct ocfs2_xattr_value_root *xv;
769 size_t size;
770 int ret = -ENODATA, name_offset, name_len, block_off, i;
771
772 memset(&xs->bucket, 0, sizeof(xs->bucket));
773
774 ret = ocfs2_xattr_block_find(inode, name_index, name, xs);
775 if (ret) {
776 mlog_errno(ret);
777 goto cleanup;
778 }
779
780 if (xs->not_found) {
781 ret = -ENODATA;
782 goto cleanup;
783 }
784
785 xb = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
786 size = le64_to_cpu(xs->here->xe_value_size);
787 if (buffer) {
788 ret = -ERANGE;
789 if (size > buffer_size)
790 goto cleanup;
791
792 name_offset = le16_to_cpu(xs->here->xe_name_offset);
793 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
794 i = xs->here - xs->header->xh_entries;
795
796 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
797 ret = ocfs2_xattr_bucket_get_name_value(inode,
798 xs->bucket.xh,
799 i,
800 &block_off,
801 &name_offset);
802 xs->base = xs->bucket.bhs[block_off]->b_data;
803 }
804 if (ocfs2_xattr_is_local(xs->here)) {
805 memcpy(buffer, (void *)xs->base +
806 name_offset + name_len, size);
807 } else {
808 xv = (struct ocfs2_xattr_value_root *)
809 (xs->base + name_offset + name_len);
810 ret = ocfs2_xattr_get_value_outside(inode, xv,
811 buffer, size);
812 if (ret < 0) {
813 mlog_errno(ret);
814 goto cleanup;
815 }
816 }
817 }
818 ret = size;
819 cleanup:
820 for (i = 0; i < OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET; i++)
821 brelse(xs->bucket.bhs[i]);
822 memset(&xs->bucket, 0, sizeof(xs->bucket));
823
824 brelse(xs->xattr_bh);
825 xs->xattr_bh = NULL;
826 return ret;
827 }
828
829 /* ocfs2_xattr_get()
830 *
831 * Copy an extended attribute into the buffer provided.
832 * Buffer is NULL to compute the size of buffer required.
833 */
834 static int ocfs2_xattr_get(struct inode *inode,
835 int name_index,
836 const char *name,
837 void *buffer,
838 size_t buffer_size)
839 {
840 int ret;
841 struct ocfs2_dinode *di = NULL;
842 struct buffer_head *di_bh = NULL;
843 struct ocfs2_inode_info *oi = OCFS2_I(inode);
844 struct ocfs2_xattr_search xis = {
845 .not_found = -ENODATA,
846 };
847 struct ocfs2_xattr_search xbs = {
848 .not_found = -ENODATA,
849 };
850
851 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
852 return -EOPNOTSUPP;
853
854 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
855 ret = -ENODATA;
856
857 ret = ocfs2_inode_lock(inode, &di_bh, 0);
858 if (ret < 0) {
859 mlog_errno(ret);
860 return ret;
861 }
862 xis.inode_bh = xbs.inode_bh = di_bh;
863 di = (struct ocfs2_dinode *)di_bh->b_data;
864
865 down_read(&oi->ip_xattr_sem);
866 ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
867 buffer_size, &xis);
868 if (ret == -ENODATA && di->i_xattr_loc)
869 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
870 buffer_size, &xbs);
871 up_read(&oi->ip_xattr_sem);
872 ocfs2_inode_unlock(inode, 0);
873
874 brelse(di_bh);
875
876 return ret;
877 }
878
879 static int __ocfs2_xattr_set_value_outside(struct inode *inode,
880 struct ocfs2_xattr_value_root *xv,
881 const void *value,
882 int value_len)
883 {
884 int ret = 0, i, cp_len, credits;
885 u16 blocksize = inode->i_sb->s_blocksize;
886 u32 p_cluster, num_clusters;
887 u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
888 u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
889 u64 blkno;
890 struct buffer_head *bh = NULL;
891 handle_t *handle;
892
893 BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
894
895 credits = clusters * bpc;
896 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), credits);
897 if (IS_ERR(handle)) {
898 ret = PTR_ERR(handle);
899 mlog_errno(ret);
900 goto out;
901 }
902
903 while (cpos < clusters) {
904 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
905 &num_clusters, &xv->xr_list);
906 if (ret) {
907 mlog_errno(ret);
908 goto out_commit;
909 }
910
911 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
912
913 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
914 ret = ocfs2_read_block(inode, blkno, &bh);
915 if (ret) {
916 mlog_errno(ret);
917 goto out_commit;
918 }
919
920 ret = ocfs2_journal_access(handle,
921 inode,
922 bh,
923 OCFS2_JOURNAL_ACCESS_WRITE);
924 if (ret < 0) {
925 mlog_errno(ret);
926 goto out_commit;
927 }
928
929 cp_len = value_len > blocksize ? blocksize : value_len;
930 memcpy(bh->b_data, value, cp_len);
931 value_len -= cp_len;
932 value += cp_len;
933 if (cp_len < blocksize)
934 memset(bh->b_data + cp_len, 0,
935 blocksize - cp_len);
936
937 ret = ocfs2_journal_dirty(handle, bh);
938 if (ret < 0) {
939 mlog_errno(ret);
940 goto out_commit;
941 }
942 brelse(bh);
943 bh = NULL;
944
945 /*
946 * XXX: do we need to empty all the following
947 * blocks in this cluster?
948 */
949 if (!value_len)
950 break;
951 }
952 cpos += num_clusters;
953 }
954 out_commit:
955 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
956 out:
957 brelse(bh);
958
959 return ret;
960 }
961
962 static int ocfs2_xattr_cleanup(struct inode *inode,
963 struct ocfs2_xattr_info *xi,
964 struct ocfs2_xattr_search *xs,
965 size_t offs)
966 {
967 handle_t *handle = NULL;
968 int ret = 0;
969 size_t name_len = strlen(xi->name);
970 void *val = xs->base + offs;
971 size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
972
973 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
974 OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
975 if (IS_ERR(handle)) {
976 ret = PTR_ERR(handle);
977 mlog_errno(ret);
978 goto out;
979 }
980 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
981 OCFS2_JOURNAL_ACCESS_WRITE);
982 if (ret) {
983 mlog_errno(ret);
984 goto out_commit;
985 }
986 /* Decrease xattr count */
987 le16_add_cpu(&xs->header->xh_count, -1);
988 /* Remove the xattr entry and tree root which has already be set*/
989 memset((void *)xs->here, 0, sizeof(struct ocfs2_xattr_entry));
990 memset(val, 0, size);
991
992 ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
993 if (ret < 0)
994 mlog_errno(ret);
995 out_commit:
996 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
997 out:
998 return ret;
999 }
1000
1001 static int ocfs2_xattr_update_entry(struct inode *inode,
1002 struct ocfs2_xattr_info *xi,
1003 struct ocfs2_xattr_search *xs,
1004 size_t offs)
1005 {
1006 handle_t *handle = NULL;
1007 int ret = 0;
1008
1009 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1010 OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
1011 if (IS_ERR(handle)) {
1012 ret = PTR_ERR(handle);
1013 mlog_errno(ret);
1014 goto out;
1015 }
1016 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1017 OCFS2_JOURNAL_ACCESS_WRITE);
1018 if (ret) {
1019 mlog_errno(ret);
1020 goto out_commit;
1021 }
1022
1023 xs->here->xe_name_offset = cpu_to_le16(offs);
1024 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1025 if (xi->value_len <= OCFS2_XATTR_INLINE_SIZE)
1026 ocfs2_xattr_set_local(xs->here, 1);
1027 else
1028 ocfs2_xattr_set_local(xs->here, 0);
1029 ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1030
1031 ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
1032 if (ret < 0)
1033 mlog_errno(ret);
1034 out_commit:
1035 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1036 out:
1037 return ret;
1038 }
1039
1040 /*
1041 * ocfs2_xattr_set_value_outside()
1042 *
1043 * Set large size value in B tree.
1044 */
1045 static int ocfs2_xattr_set_value_outside(struct inode *inode,
1046 struct ocfs2_xattr_info *xi,
1047 struct ocfs2_xattr_search *xs,
1048 size_t offs)
1049 {
1050 size_t name_len = strlen(xi->name);
1051 void *val = xs->base + offs;
1052 struct ocfs2_xattr_value_root *xv = NULL;
1053 size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1054 int ret = 0;
1055
1056 memset(val, 0, size);
1057 memcpy(val, xi->name, name_len);
1058 xv = (struct ocfs2_xattr_value_root *)
1059 (val + OCFS2_XATTR_SIZE(name_len));
1060 xv->xr_clusters = 0;
1061 xv->xr_last_eb_blk = 0;
1062 xv->xr_list.l_tree_depth = 0;
1063 xv->xr_list.l_count = cpu_to_le16(1);
1064 xv->xr_list.l_next_free_rec = 0;
1065
1066 ret = ocfs2_xattr_value_truncate(inode, xs->xattr_bh, xv,
1067 xi->value_len);
1068 if (ret < 0) {
1069 mlog_errno(ret);
1070 return ret;
1071 }
1072 ret = __ocfs2_xattr_set_value_outside(inode, xv, xi->value,
1073 xi->value_len);
1074 if (ret < 0) {
1075 mlog_errno(ret);
1076 return ret;
1077 }
1078 ret = ocfs2_xattr_update_entry(inode, xi, xs, offs);
1079 if (ret < 0)
1080 mlog_errno(ret);
1081
1082 return ret;
1083 }
1084
1085 /*
1086 * ocfs2_xattr_set_entry_local()
1087 *
1088 * Set, replace or remove extended attribute in local.
1089 */
1090 static void ocfs2_xattr_set_entry_local(struct inode *inode,
1091 struct ocfs2_xattr_info *xi,
1092 struct ocfs2_xattr_search *xs,
1093 struct ocfs2_xattr_entry *last,
1094 size_t min_offs)
1095 {
1096 size_t name_len = strlen(xi->name);
1097 int i;
1098
1099 if (xi->value && xs->not_found) {
1100 /* Insert the new xattr entry. */
1101 le16_add_cpu(&xs->header->xh_count, 1);
1102 ocfs2_xattr_set_type(last, xi->name_index);
1103 ocfs2_xattr_set_local(last, 1);
1104 last->xe_name_len = name_len;
1105 } else {
1106 void *first_val;
1107 void *val;
1108 size_t offs, size;
1109
1110 first_val = xs->base + min_offs;
1111 offs = le16_to_cpu(xs->here->xe_name_offset);
1112 val = xs->base + offs;
1113
1114 if (le64_to_cpu(xs->here->xe_value_size) >
1115 OCFS2_XATTR_INLINE_SIZE)
1116 size = OCFS2_XATTR_SIZE(name_len) +
1117 OCFS2_XATTR_ROOT_SIZE;
1118 else
1119 size = OCFS2_XATTR_SIZE(name_len) +
1120 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1121
1122 if (xi->value && size == OCFS2_XATTR_SIZE(name_len) +
1123 OCFS2_XATTR_SIZE(xi->value_len)) {
1124 /* The old and the new value have the
1125 same size. Just replace the value. */
1126 ocfs2_xattr_set_local(xs->here, 1);
1127 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1128 /* Clear value bytes. */
1129 memset(val + OCFS2_XATTR_SIZE(name_len),
1130 0,
1131 OCFS2_XATTR_SIZE(xi->value_len));
1132 memcpy(val + OCFS2_XATTR_SIZE(name_len),
1133 xi->value,
1134 xi->value_len);
1135 return;
1136 }
1137 /* Remove the old name+value. */
1138 memmove(first_val + size, first_val, val - first_val);
1139 memset(first_val, 0, size);
1140 xs->here->xe_name_hash = 0;
1141 xs->here->xe_name_offset = 0;
1142 ocfs2_xattr_set_local(xs->here, 1);
1143 xs->here->xe_value_size = 0;
1144
1145 min_offs += size;
1146
1147 /* Adjust all value offsets. */
1148 last = xs->header->xh_entries;
1149 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1150 size_t o = le16_to_cpu(last->xe_name_offset);
1151
1152 if (o < offs)
1153 last->xe_name_offset = cpu_to_le16(o + size);
1154 last += 1;
1155 }
1156
1157 if (!xi->value) {
1158 /* Remove the old entry. */
1159 last -= 1;
1160 memmove(xs->here, xs->here + 1,
1161 (void *)last - (void *)xs->here);
1162 memset(last, 0, sizeof(struct ocfs2_xattr_entry));
1163 le16_add_cpu(&xs->header->xh_count, -1);
1164 }
1165 }
1166 if (xi->value) {
1167 /* Insert the new name+value. */
1168 size_t size = OCFS2_XATTR_SIZE(name_len) +
1169 OCFS2_XATTR_SIZE(xi->value_len);
1170 void *val = xs->base + min_offs - size;
1171
1172 xs->here->xe_name_offset = cpu_to_le16(min_offs - size);
1173 memset(val, 0, size);
1174 memcpy(val, xi->name, name_len);
1175 memcpy(val + OCFS2_XATTR_SIZE(name_len),
1176 xi->value,
1177 xi->value_len);
1178 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1179 ocfs2_xattr_set_local(xs->here, 1);
1180 ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1181 }
1182
1183 return;
1184 }
1185
1186 /*
1187 * ocfs2_xattr_set_entry()
1188 *
1189 * Set extended attribute entry into inode or block.
1190 *
1191 * If extended attribute value size > OCFS2_XATTR_INLINE_SIZE,
1192 * We first insert tree root(ocfs2_xattr_value_root) with set_entry_local(),
1193 * then set value in B tree with set_value_outside().
1194 */
1195 static int ocfs2_xattr_set_entry(struct inode *inode,
1196 struct ocfs2_xattr_info *xi,
1197 struct ocfs2_xattr_search *xs,
1198 int flag)
1199 {
1200 struct ocfs2_xattr_entry *last;
1201 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1202 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1203 size_t min_offs = xs->end - xs->base, name_len = strlen(xi->name);
1204 size_t size_l = 0;
1205 handle_t *handle = NULL;
1206 int free, i, ret;
1207 struct ocfs2_xattr_info xi_l = {
1208 .name_index = xi->name_index,
1209 .name = xi->name,
1210 .value = xi->value,
1211 .value_len = xi->value_len,
1212 };
1213
1214 /* Compute min_offs, last and free space. */
1215 last = xs->header->xh_entries;
1216
1217 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1218 size_t offs = le16_to_cpu(last->xe_name_offset);
1219 if (offs < min_offs)
1220 min_offs = offs;
1221 last += 1;
1222 }
1223
1224 free = min_offs - ((void *)last - xs->base) - sizeof(__u32);
1225 if (free < 0)
1226 return -EIO;
1227
1228 if (!xs->not_found) {
1229 size_t size = 0;
1230 if (ocfs2_xattr_is_local(xs->here))
1231 size = OCFS2_XATTR_SIZE(name_len) +
1232 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1233 else
1234 size = OCFS2_XATTR_SIZE(name_len) +
1235 OCFS2_XATTR_ROOT_SIZE;
1236 free += (size + sizeof(struct ocfs2_xattr_entry));
1237 }
1238 /* Check free space in inode or block */
1239 if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1240 if (free < sizeof(struct ocfs2_xattr_entry) +
1241 OCFS2_XATTR_SIZE(name_len) +
1242 OCFS2_XATTR_ROOT_SIZE) {
1243 ret = -ENOSPC;
1244 goto out;
1245 }
1246 size_l = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1247 xi_l.value = (void *)&def_xv;
1248 xi_l.value_len = OCFS2_XATTR_ROOT_SIZE;
1249 } else if (xi->value) {
1250 if (free < sizeof(struct ocfs2_xattr_entry) +
1251 OCFS2_XATTR_SIZE(name_len) +
1252 OCFS2_XATTR_SIZE(xi->value_len)) {
1253 ret = -ENOSPC;
1254 goto out;
1255 }
1256 }
1257
1258 if (!xs->not_found) {
1259 /* For existing extended attribute */
1260 size_t size = OCFS2_XATTR_SIZE(name_len) +
1261 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1262 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1263 void *val = xs->base + offs;
1264
1265 if (ocfs2_xattr_is_local(xs->here) && size == size_l) {
1266 /* Replace existing local xattr with tree root */
1267 ret = ocfs2_xattr_set_value_outside(inode, xi, xs,
1268 offs);
1269 if (ret < 0)
1270 mlog_errno(ret);
1271 goto out;
1272 } else if (!ocfs2_xattr_is_local(xs->here)) {
1273 /* For existing xattr which has value outside */
1274 struct ocfs2_xattr_value_root *xv = NULL;
1275 xv = (struct ocfs2_xattr_value_root *)(val +
1276 OCFS2_XATTR_SIZE(name_len));
1277
1278 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1279 /*
1280 * If new value need set outside also,
1281 * first truncate old value to new value,
1282 * then set new value with set_value_outside().
1283 */
1284 ret = ocfs2_xattr_value_truncate(inode,
1285 xs->xattr_bh,
1286 xv,
1287 xi->value_len);
1288 if (ret < 0) {
1289 mlog_errno(ret);
1290 goto out;
1291 }
1292
1293 ret = __ocfs2_xattr_set_value_outside(inode,
1294 xv,
1295 xi->value,
1296 xi->value_len);
1297 if (ret < 0) {
1298 mlog_errno(ret);
1299 goto out;
1300 }
1301
1302 ret = ocfs2_xattr_update_entry(inode,
1303 xi,
1304 xs,
1305 offs);
1306 if (ret < 0)
1307 mlog_errno(ret);
1308 goto out;
1309 } else {
1310 /*
1311 * If new value need set in local,
1312 * just trucate old value to zero.
1313 */
1314 ret = ocfs2_xattr_value_truncate(inode,
1315 xs->xattr_bh,
1316 xv,
1317 0);
1318 if (ret < 0)
1319 mlog_errno(ret);
1320 }
1321 }
1322 }
1323
1324 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1325 OCFS2_INODE_UPDATE_CREDITS);
1326 if (IS_ERR(handle)) {
1327 ret = PTR_ERR(handle);
1328 mlog_errno(ret);
1329 goto out;
1330 }
1331
1332 ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
1333 OCFS2_JOURNAL_ACCESS_WRITE);
1334 if (ret) {
1335 mlog_errno(ret);
1336 goto out_commit;
1337 }
1338
1339 if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1340 /* set extended attribute in external block. */
1341 ret = ocfs2_extend_trans(handle,
1342 OCFS2_INODE_UPDATE_CREDITS +
1343 OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
1344 if (ret) {
1345 mlog_errno(ret);
1346 goto out_commit;
1347 }
1348 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1349 OCFS2_JOURNAL_ACCESS_WRITE);
1350 if (ret) {
1351 mlog_errno(ret);
1352 goto out_commit;
1353 }
1354 }
1355
1356 /*
1357 * Set value in local, include set tree root in local.
1358 * This is the first step for value size >INLINE_SIZE.
1359 */
1360 ocfs2_xattr_set_entry_local(inode, &xi_l, xs, last, min_offs);
1361
1362 if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1363 ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
1364 if (ret < 0) {
1365 mlog_errno(ret);
1366 goto out_commit;
1367 }
1368 }
1369
1370 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) &&
1371 (flag & OCFS2_INLINE_XATTR_FL)) {
1372 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1373 unsigned int xattrsize = osb->s_xattr_inline_size;
1374
1375 /*
1376 * Adjust extent record count or inline data size
1377 * to reserve space for extended attribute.
1378 */
1379 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1380 struct ocfs2_inline_data *idata = &di->id2.i_data;
1381 le16_add_cpu(&idata->id_count, -xattrsize);
1382 } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
1383 struct ocfs2_extent_list *el = &di->id2.i_list;
1384 le16_add_cpu(&el->l_count, -(xattrsize /
1385 sizeof(struct ocfs2_extent_rec)));
1386 }
1387 di->i_xattr_inline_size = cpu_to_le16(xattrsize);
1388 }
1389 /* Update xattr flag */
1390 spin_lock(&oi->ip_lock);
1391 oi->ip_dyn_features |= flag;
1392 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1393 spin_unlock(&oi->ip_lock);
1394 /* Update inode ctime */
1395 inode->i_ctime = CURRENT_TIME;
1396 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
1397 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
1398
1399 ret = ocfs2_journal_dirty(handle, xs->inode_bh);
1400 if (ret < 0)
1401 mlog_errno(ret);
1402
1403 out_commit:
1404 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1405
1406 if (!ret && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1407 /*
1408 * Set value outside in B tree.
1409 * This is the second step for value size > INLINE_SIZE.
1410 */
1411 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1412 ret = ocfs2_xattr_set_value_outside(inode, xi, xs, offs);
1413 if (ret < 0) {
1414 int ret2;
1415
1416 mlog_errno(ret);
1417 /*
1418 * If set value outside failed, we have to clean
1419 * the junk tree root we have already set in local.
1420 */
1421 ret2 = ocfs2_xattr_cleanup(inode, xi, xs, offs);
1422 if (ret2 < 0)
1423 mlog_errno(ret2);
1424 }
1425 }
1426 out:
1427 return ret;
1428
1429 }
1430
1431 static int ocfs2_remove_value_outside(struct inode*inode,
1432 struct buffer_head *bh,
1433 struct ocfs2_xattr_header *header)
1434 {
1435 int ret = 0, i;
1436
1437 for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
1438 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
1439
1440 if (!ocfs2_xattr_is_local(entry)) {
1441 struct ocfs2_xattr_value_root *xv;
1442 void *val;
1443
1444 val = (void *)header +
1445 le16_to_cpu(entry->xe_name_offset);
1446 xv = (struct ocfs2_xattr_value_root *)
1447 (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
1448 ret = ocfs2_xattr_value_truncate(inode, bh, xv, 0);
1449 if (ret < 0) {
1450 mlog_errno(ret);
1451 return ret;
1452 }
1453 }
1454 }
1455
1456 return ret;
1457 }
1458
1459 static int ocfs2_xattr_ibody_remove(struct inode *inode,
1460 struct buffer_head *di_bh)
1461 {
1462
1463 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1464 struct ocfs2_xattr_header *header;
1465 int ret;
1466
1467 header = (struct ocfs2_xattr_header *)
1468 ((void *)di + inode->i_sb->s_blocksize -
1469 le16_to_cpu(di->i_xattr_inline_size));
1470
1471 ret = ocfs2_remove_value_outside(inode, di_bh, header);
1472
1473 return ret;
1474 }
1475
1476 static int ocfs2_xattr_block_remove(struct inode *inode,
1477 struct buffer_head *blk_bh)
1478 {
1479 struct ocfs2_xattr_block *xb;
1480 int ret = 0;
1481
1482 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1483 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
1484 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
1485 ret = ocfs2_remove_value_outside(inode, blk_bh, header);
1486 } else
1487 ret = ocfs2_delete_xattr_index_block(inode, blk_bh);
1488
1489 return ret;
1490 }
1491
1492 static int ocfs2_xattr_free_block(struct inode *inode,
1493 u64 block)
1494 {
1495 struct inode *xb_alloc_inode;
1496 struct buffer_head *xb_alloc_bh = NULL;
1497 struct buffer_head *blk_bh = NULL;
1498 struct ocfs2_xattr_block *xb;
1499 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1500 handle_t *handle;
1501 int ret = 0;
1502 u64 blk, bg_blkno;
1503 u16 bit;
1504
1505 ret = ocfs2_read_block(inode, block, &blk_bh);
1506 if (ret < 0) {
1507 mlog_errno(ret);
1508 goto out;
1509 }
1510
1511 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1512 if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
1513 ret = -EIO;
1514 goto out;
1515 }
1516
1517 ret = ocfs2_xattr_block_remove(inode, blk_bh);
1518 if (ret < 0) {
1519 mlog_errno(ret);
1520 goto out;
1521 }
1522
1523 blk = le64_to_cpu(xb->xb_blkno);
1524 bit = le16_to_cpu(xb->xb_suballoc_bit);
1525 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
1526
1527 xb_alloc_inode = ocfs2_get_system_file_inode(osb,
1528 EXTENT_ALLOC_SYSTEM_INODE,
1529 le16_to_cpu(xb->xb_suballoc_slot));
1530 if (!xb_alloc_inode) {
1531 ret = -ENOMEM;
1532 mlog_errno(ret);
1533 goto out;
1534 }
1535 mutex_lock(&xb_alloc_inode->i_mutex);
1536
1537 ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
1538 if (ret < 0) {
1539 mlog_errno(ret);
1540 goto out_mutex;
1541 }
1542
1543 handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
1544 if (IS_ERR(handle)) {
1545 ret = PTR_ERR(handle);
1546 mlog_errno(ret);
1547 goto out_unlock;
1548 }
1549
1550 ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
1551 bit, bg_blkno, 1);
1552 if (ret < 0)
1553 mlog_errno(ret);
1554
1555 ocfs2_commit_trans(osb, handle);
1556 out_unlock:
1557 ocfs2_inode_unlock(xb_alloc_inode, 1);
1558 brelse(xb_alloc_bh);
1559 out_mutex:
1560 mutex_unlock(&xb_alloc_inode->i_mutex);
1561 iput(xb_alloc_inode);
1562 out:
1563 brelse(blk_bh);
1564 return ret;
1565 }
1566
1567 /*
1568 * ocfs2_xattr_remove()
1569 *
1570 * Free extended attribute resources associated with this inode.
1571 */
1572 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
1573 {
1574 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1575 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1576 handle_t *handle;
1577 int ret;
1578
1579 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1580 return 0;
1581
1582 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1583 return 0;
1584
1585 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
1586 ret = ocfs2_xattr_ibody_remove(inode, di_bh);
1587 if (ret < 0) {
1588 mlog_errno(ret);
1589 goto out;
1590 }
1591 }
1592
1593 if (di->i_xattr_loc) {
1594 ret = ocfs2_xattr_free_block(inode,
1595 le64_to_cpu(di->i_xattr_loc));
1596 if (ret < 0) {
1597 mlog_errno(ret);
1598 goto out;
1599 }
1600 }
1601
1602 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1603 OCFS2_INODE_UPDATE_CREDITS);
1604 if (IS_ERR(handle)) {
1605 ret = PTR_ERR(handle);
1606 mlog_errno(ret);
1607 goto out;
1608 }
1609 ret = ocfs2_journal_access(handle, inode, di_bh,
1610 OCFS2_JOURNAL_ACCESS_WRITE);
1611 if (ret) {
1612 mlog_errno(ret);
1613 goto out_commit;
1614 }
1615
1616 di->i_xattr_loc = 0;
1617
1618 spin_lock(&oi->ip_lock);
1619 oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
1620 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1621 spin_unlock(&oi->ip_lock);
1622
1623 ret = ocfs2_journal_dirty(handle, di_bh);
1624 if (ret < 0)
1625 mlog_errno(ret);
1626 out_commit:
1627 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1628 out:
1629 return ret;
1630 }
1631
1632 static int ocfs2_xattr_has_space_inline(struct inode *inode,
1633 struct ocfs2_dinode *di)
1634 {
1635 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1636 unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
1637 int free;
1638
1639 if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
1640 return 0;
1641
1642 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1643 struct ocfs2_inline_data *idata = &di->id2.i_data;
1644 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
1645 } else if (ocfs2_inode_is_fast_symlink(inode)) {
1646 free = ocfs2_fast_symlink_chars(inode->i_sb) -
1647 le64_to_cpu(di->i_size);
1648 } else {
1649 struct ocfs2_extent_list *el = &di->id2.i_list;
1650 free = (le16_to_cpu(el->l_count) -
1651 le16_to_cpu(el->l_next_free_rec)) *
1652 sizeof(struct ocfs2_extent_rec);
1653 }
1654 if (free >= xattrsize)
1655 return 1;
1656
1657 return 0;
1658 }
1659
1660 /*
1661 * ocfs2_xattr_ibody_find()
1662 *
1663 * Find extended attribute in inode block and
1664 * fill search info into struct ocfs2_xattr_search.
1665 */
1666 static int ocfs2_xattr_ibody_find(struct inode *inode,
1667 int name_index,
1668 const char *name,
1669 struct ocfs2_xattr_search *xs)
1670 {
1671 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1672 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1673 int ret;
1674 int has_space = 0;
1675
1676 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
1677 return 0;
1678
1679 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
1680 down_read(&oi->ip_alloc_sem);
1681 has_space = ocfs2_xattr_has_space_inline(inode, di);
1682 up_read(&oi->ip_alloc_sem);
1683 if (!has_space)
1684 return 0;
1685 }
1686
1687 xs->xattr_bh = xs->inode_bh;
1688 xs->end = (void *)di + inode->i_sb->s_blocksize;
1689 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
1690 xs->header = (struct ocfs2_xattr_header *)
1691 (xs->end - le16_to_cpu(di->i_xattr_inline_size));
1692 else
1693 xs->header = (struct ocfs2_xattr_header *)
1694 (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
1695 xs->base = (void *)xs->header;
1696 xs->here = xs->header->xh_entries;
1697
1698 /* Find the named attribute. */
1699 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
1700 ret = ocfs2_xattr_find_entry(name_index, name, xs);
1701 if (ret && ret != -ENODATA)
1702 return ret;
1703 xs->not_found = ret;
1704 }
1705
1706 return 0;
1707 }
1708
1709 /*
1710 * ocfs2_xattr_ibody_set()
1711 *
1712 * Set, replace or remove an extended attribute into inode block.
1713 *
1714 */
1715 static int ocfs2_xattr_ibody_set(struct inode *inode,
1716 struct ocfs2_xattr_info *xi,
1717 struct ocfs2_xattr_search *xs)
1718 {
1719 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1720 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1721 int ret;
1722
1723 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
1724 return -ENOSPC;
1725
1726 down_write(&oi->ip_alloc_sem);
1727 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
1728 if (!ocfs2_xattr_has_space_inline(inode, di)) {
1729 ret = -ENOSPC;
1730 goto out;
1731 }
1732 }
1733
1734 ret = ocfs2_xattr_set_entry(inode, xi, xs,
1735 (OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL));
1736 out:
1737 up_write(&oi->ip_alloc_sem);
1738
1739 return ret;
1740 }
1741
1742 /*
1743 * ocfs2_xattr_block_find()
1744 *
1745 * Find extended attribute in external block and
1746 * fill search info into struct ocfs2_xattr_search.
1747 */
1748 static int ocfs2_xattr_block_find(struct inode *inode,
1749 int name_index,
1750 const char *name,
1751 struct ocfs2_xattr_search *xs)
1752 {
1753 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1754 struct buffer_head *blk_bh = NULL;
1755 struct ocfs2_xattr_block *xb;
1756 int ret = 0;
1757
1758 if (!di->i_xattr_loc)
1759 return ret;
1760
1761 ret = ocfs2_read_block(inode, le64_to_cpu(di->i_xattr_loc), &blk_bh);
1762 if (ret < 0) {
1763 mlog_errno(ret);
1764 return ret;
1765 }
1766
1767 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1768 if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
1769 ret = -EIO;
1770 goto cleanup;
1771 }
1772
1773 xs->xattr_bh = blk_bh;
1774
1775 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
1776 xs->header = &xb->xb_attrs.xb_header;
1777 xs->base = (void *)xs->header;
1778 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
1779 xs->here = xs->header->xh_entries;
1780
1781 ret = ocfs2_xattr_find_entry(name_index, name, xs);
1782 } else
1783 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
1784 name_index,
1785 name, xs);
1786
1787 if (ret && ret != -ENODATA) {
1788 xs->xattr_bh = NULL;
1789 goto cleanup;
1790 }
1791 xs->not_found = ret;
1792 return 0;
1793 cleanup:
1794 brelse(blk_bh);
1795
1796 return ret;
1797 }
1798
1799 /*
1800 * ocfs2_xattr_block_set()
1801 *
1802 * Set, replace or remove an extended attribute into external block.
1803 *
1804 */
1805 static int ocfs2_xattr_block_set(struct inode *inode,
1806 struct ocfs2_xattr_info *xi,
1807 struct ocfs2_xattr_search *xs)
1808 {
1809 struct buffer_head *new_bh = NULL;
1810 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1811 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1812 struct ocfs2_alloc_context *meta_ac = NULL;
1813 handle_t *handle = NULL;
1814 struct ocfs2_xattr_block *xblk = NULL;
1815 u16 suballoc_bit_start;
1816 u32 num_got;
1817 u64 first_blkno;
1818 int ret;
1819
1820 if (!xs->xattr_bh) {
1821 /*
1822 * Alloc one external block for extended attribute
1823 * outside of inode.
1824 */
1825 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
1826 if (ret < 0) {
1827 mlog_errno(ret);
1828 goto out;
1829 }
1830 handle = ocfs2_start_trans(osb,
1831 OCFS2_XATTR_BLOCK_CREATE_CREDITS);
1832 if (IS_ERR(handle)) {
1833 ret = PTR_ERR(handle);
1834 mlog_errno(ret);
1835 goto out;
1836 }
1837 ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
1838 OCFS2_JOURNAL_ACCESS_CREATE);
1839 if (ret < 0) {
1840 mlog_errno(ret);
1841 goto out_commit;
1842 }
1843
1844 ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1,
1845 &suballoc_bit_start, &num_got,
1846 &first_blkno);
1847 if (ret < 0) {
1848 mlog_errno(ret);
1849 goto out_commit;
1850 }
1851
1852 new_bh = sb_getblk(inode->i_sb, first_blkno);
1853 ocfs2_set_new_buffer_uptodate(inode, new_bh);
1854
1855 ret = ocfs2_journal_access(handle, inode, new_bh,
1856 OCFS2_JOURNAL_ACCESS_CREATE);
1857 if (ret < 0) {
1858 mlog_errno(ret);
1859 goto out_commit;
1860 }
1861
1862 /* Initialize ocfs2_xattr_block */
1863 xs->xattr_bh = new_bh;
1864 xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
1865 memset(xblk, 0, inode->i_sb->s_blocksize);
1866 strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
1867 xblk->xb_suballoc_slot = cpu_to_le16(osb->slot_num);
1868 xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
1869 xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation);
1870 xblk->xb_blkno = cpu_to_le64(first_blkno);
1871
1872 xs->header = &xblk->xb_attrs.xb_header;
1873 xs->base = (void *)xs->header;
1874 xs->end = (void *)xblk + inode->i_sb->s_blocksize;
1875 xs->here = xs->header->xh_entries;
1876
1877
1878 ret = ocfs2_journal_dirty(handle, new_bh);
1879 if (ret < 0) {
1880 mlog_errno(ret);
1881 goto out_commit;
1882 }
1883 di->i_xattr_loc = cpu_to_le64(first_blkno);
1884 ret = ocfs2_journal_dirty(handle, xs->inode_bh);
1885 if (ret < 0)
1886 mlog_errno(ret);
1887 out_commit:
1888 ocfs2_commit_trans(osb, handle);
1889 out:
1890 if (meta_ac)
1891 ocfs2_free_alloc_context(meta_ac);
1892 if (ret < 0)
1893 return ret;
1894 } else
1895 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1896
1897 if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
1898 /* Set extended attribute into external block */
1899 ret = ocfs2_xattr_set_entry(inode, xi, xs, OCFS2_HAS_XATTR_FL);
1900 if (!ret || ret != -ENOSPC)
1901 goto end;
1902
1903 ret = ocfs2_xattr_create_index_block(inode, xs);
1904 if (ret)
1905 goto end;
1906 }
1907
1908 ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs);
1909
1910 end:
1911
1912 return ret;
1913 }
1914
1915 /*
1916 * ocfs2_xattr_set()
1917 *
1918 * Set, replace or remove an extended attribute for this inode.
1919 * value is NULL to remove an existing extended attribute, else either
1920 * create or replace an extended attribute.
1921 */
1922 int ocfs2_xattr_set(struct inode *inode,
1923 int name_index,
1924 const char *name,
1925 const void *value,
1926 size_t value_len,
1927 int flags)
1928 {
1929 struct buffer_head *di_bh = NULL;
1930 struct ocfs2_dinode *di;
1931 int ret;
1932 u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
1933
1934 struct ocfs2_xattr_info xi = {
1935 .name_index = name_index,
1936 .name = name,
1937 .value = value,
1938 .value_len = value_len,
1939 };
1940
1941 struct ocfs2_xattr_search xis = {
1942 .not_found = -ENODATA,
1943 };
1944
1945 struct ocfs2_xattr_search xbs = {
1946 .not_found = -ENODATA,
1947 };
1948
1949 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1950 return -EOPNOTSUPP;
1951
1952 ret = ocfs2_inode_lock(inode, &di_bh, 1);
1953 if (ret < 0) {
1954 mlog_errno(ret);
1955 return ret;
1956 }
1957 xis.inode_bh = xbs.inode_bh = di_bh;
1958 di = (struct ocfs2_dinode *)di_bh->b_data;
1959
1960 down_write(&OCFS2_I(inode)->ip_xattr_sem);
1961 /*
1962 * Scan inode and external block to find the same name
1963 * extended attribute and collect search infomation.
1964 */
1965 ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
1966 if (ret)
1967 goto cleanup;
1968 if (xis.not_found) {
1969 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
1970 if (ret)
1971 goto cleanup;
1972 }
1973
1974 if (xis.not_found && xbs.not_found) {
1975 ret = -ENODATA;
1976 if (flags & XATTR_REPLACE)
1977 goto cleanup;
1978 ret = 0;
1979 if (!value)
1980 goto cleanup;
1981 } else {
1982 ret = -EEXIST;
1983 if (flags & XATTR_CREATE)
1984 goto cleanup;
1985 }
1986
1987 if (!value) {
1988 /* Remove existing extended attribute */
1989 if (!xis.not_found)
1990 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
1991 else if (!xbs.not_found)
1992 ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
1993 } else {
1994 /* We always try to set extended attribute into inode first*/
1995 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
1996 if (!ret && !xbs.not_found) {
1997 /*
1998 * If succeed and that extended attribute existing in
1999 * external block, then we will remove it.
2000 */
2001 xi.value = NULL;
2002 xi.value_len = 0;
2003 ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
2004 } else if (ret == -ENOSPC) {
2005 if (di->i_xattr_loc && !xbs.xattr_bh) {
2006 ret = ocfs2_xattr_block_find(inode, name_index,
2007 name, &xbs);
2008 if (ret)
2009 goto cleanup;
2010 }
2011 /*
2012 * If no space in inode, we will set extended attribute
2013 * into external block.
2014 */
2015 ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
2016 if (ret)
2017 goto cleanup;
2018 if (!xis.not_found) {
2019 /*
2020 * If succeed and that extended attribute
2021 * existing in inode, we will remove it.
2022 */
2023 xi.value = NULL;
2024 xi.value_len = 0;
2025 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
2026 }
2027 }
2028 }
2029 cleanup:
2030 up_write(&OCFS2_I(inode)->ip_xattr_sem);
2031 ocfs2_inode_unlock(inode, 1);
2032 brelse(di_bh);
2033 brelse(xbs.xattr_bh);
2034 for (i = 0; i < blk_per_bucket; i++)
2035 brelse(xbs.bucket.bhs[i]);
2036
2037 return ret;
2038 }
2039
2040 /*
2041 * Find the xattr extent rec which may contains name_hash.
2042 * e_cpos will be the first name hash of the xattr rec.
2043 * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
2044 */
2045 static int ocfs2_xattr_get_rec(struct inode *inode,
2046 u32 name_hash,
2047 u64 *p_blkno,
2048 u32 *e_cpos,
2049 u32 *num_clusters,
2050 struct ocfs2_extent_list *el)
2051 {
2052 int ret = 0, i;
2053 struct buffer_head *eb_bh = NULL;
2054 struct ocfs2_extent_block *eb;
2055 struct ocfs2_extent_rec *rec = NULL;
2056 u64 e_blkno = 0;
2057
2058 if (el->l_tree_depth) {
2059 ret = ocfs2_find_leaf(inode, el, name_hash, &eb_bh);
2060 if (ret) {
2061 mlog_errno(ret);
2062 goto out;
2063 }
2064
2065 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2066 el = &eb->h_list;
2067
2068 if (el->l_tree_depth) {
2069 ocfs2_error(inode->i_sb,
2070 "Inode %lu has non zero tree depth in "
2071 "xattr tree block %llu\n", inode->i_ino,
2072 (unsigned long long)eb_bh->b_blocknr);
2073 ret = -EROFS;
2074 goto out;
2075 }
2076 }
2077
2078 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
2079 rec = &el->l_recs[i];
2080
2081 if (le32_to_cpu(rec->e_cpos) <= name_hash) {
2082 e_blkno = le64_to_cpu(rec->e_blkno);
2083 break;
2084 }
2085 }
2086
2087 if (!e_blkno) {
2088 ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
2089 "record (%u, %u, 0) in xattr", inode->i_ino,
2090 le32_to_cpu(rec->e_cpos),
2091 ocfs2_rec_clusters(el, rec));
2092 ret = -EROFS;
2093 goto out;
2094 }
2095
2096 *p_blkno = le64_to_cpu(rec->e_blkno);
2097 *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
2098 if (e_cpos)
2099 *e_cpos = le32_to_cpu(rec->e_cpos);
2100 out:
2101 brelse(eb_bh);
2102 return ret;
2103 }
2104
2105 typedef int (xattr_bucket_func)(struct inode *inode,
2106 struct ocfs2_xattr_bucket *bucket,
2107 void *para);
2108
2109 static int ocfs2_find_xe_in_bucket(struct inode *inode,
2110 struct buffer_head *header_bh,
2111 int name_index,
2112 const char *name,
2113 u32 name_hash,
2114 u16 *xe_index,
2115 int *found)
2116 {
2117 int i, ret = 0, cmp = 1, block_off, new_offset;
2118 struct ocfs2_xattr_header *xh =
2119 (struct ocfs2_xattr_header *)header_bh->b_data;
2120 size_t name_len = strlen(name);
2121 struct ocfs2_xattr_entry *xe = NULL;
2122 struct buffer_head *name_bh = NULL;
2123 char *xe_name;
2124
2125 /*
2126 * We don't use binary search in the bucket because there
2127 * may be multiple entries with the same name hash.
2128 */
2129 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
2130 xe = &xh->xh_entries[i];
2131
2132 if (name_hash > le32_to_cpu(xe->xe_name_hash))
2133 continue;
2134 else if (name_hash < le32_to_cpu(xe->xe_name_hash))
2135 break;
2136
2137 cmp = name_index - ocfs2_xattr_get_type(xe);
2138 if (!cmp)
2139 cmp = name_len - xe->xe_name_len;
2140 if (cmp)
2141 continue;
2142
2143 ret = ocfs2_xattr_bucket_get_name_value(inode,
2144 xh,
2145 i,
2146 &block_off,
2147 &new_offset);
2148 if (ret) {
2149 mlog_errno(ret);
2150 break;
2151 }
2152
2153 ret = ocfs2_read_block(inode, header_bh->b_blocknr + block_off,
2154 &name_bh);
2155 if (ret) {
2156 mlog_errno(ret);
2157 break;
2158 }
2159 xe_name = name_bh->b_data + new_offset;
2160
2161 cmp = memcmp(name, xe_name, name_len);
2162 brelse(name_bh);
2163 name_bh = NULL;
2164
2165 if (cmp == 0) {
2166 *xe_index = i;
2167 *found = 1;
2168 ret = 0;
2169 break;
2170 }
2171 }
2172
2173 return ret;
2174 }
2175
2176 /*
2177 * Find the specified xattr entry in a series of buckets.
2178 * This series start from p_blkno and last for num_clusters.
2179 * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
2180 * the num of the valid buckets.
2181 *
2182 * Return the buffer_head this xattr should reside in. And if the xattr's
2183 * hash is in the gap of 2 buckets, return the lower bucket.
2184 */
2185 static int ocfs2_xattr_bucket_find(struct inode *inode,
2186 int name_index,
2187 const char *name,
2188 u32 name_hash,
2189 u64 p_blkno,
2190 u32 first_hash,
2191 u32 num_clusters,
2192 struct ocfs2_xattr_search *xs)
2193 {
2194 int ret, found = 0;
2195 struct buffer_head *bh = NULL;
2196 struct buffer_head *lower_bh = NULL;
2197 struct ocfs2_xattr_header *xh = NULL;
2198 struct ocfs2_xattr_entry *xe = NULL;
2199 u16 index = 0;
2200 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2201 int low_bucket = 0, bucket, high_bucket;
2202 u32 last_hash;
2203 u64 blkno;
2204
2205 ret = ocfs2_read_block(inode, p_blkno, &bh);
2206 if (ret) {
2207 mlog_errno(ret);
2208 goto out;
2209 }
2210
2211 xh = (struct ocfs2_xattr_header *)bh->b_data;
2212 high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
2213
2214 while (low_bucket <= high_bucket) {
2215 brelse(bh);
2216 bh = NULL;
2217 bucket = (low_bucket + high_bucket) / 2;
2218
2219 blkno = p_blkno + bucket * blk_per_bucket;
2220
2221 ret = ocfs2_read_block(inode, blkno, &bh);
2222 if (ret) {
2223 mlog_errno(ret);
2224 goto out;
2225 }
2226
2227 xh = (struct ocfs2_xattr_header *)bh->b_data;
2228 xe = &xh->xh_entries[0];
2229 if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
2230 high_bucket = bucket - 1;
2231 continue;
2232 }
2233
2234 /*
2235 * Check whether the hash of the last entry in our
2236 * bucket is larger than the search one. for an empty
2237 * bucket, the last one is also the first one.
2238 */
2239 if (xh->xh_count)
2240 xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
2241
2242 last_hash = le32_to_cpu(xe->xe_name_hash);
2243
2244 /* record lower_bh which may be the insert place. */
2245 brelse(lower_bh);
2246 lower_bh = bh;
2247 bh = NULL;
2248
2249 if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
2250 low_bucket = bucket + 1;
2251 continue;
2252 }
2253
2254 /* the searched xattr should reside in this bucket if exists. */
2255 ret = ocfs2_find_xe_in_bucket(inode, lower_bh,
2256 name_index, name, name_hash,
2257 &index, &found);
2258 if (ret) {
2259 mlog_errno(ret);
2260 goto out;
2261 }
2262 break;
2263 }
2264
2265 /*
2266 * Record the bucket we have found.
2267 * When the xattr's hash value is in the gap of 2 buckets, we will
2268 * always set it to the previous bucket.
2269 */
2270 if (!lower_bh) {
2271 /*
2272 * We can't find any bucket whose first name_hash is less
2273 * than the find name_hash.
2274 */
2275 BUG_ON(bh->b_blocknr != p_blkno);
2276 lower_bh = bh;
2277 bh = NULL;
2278 }
2279 xs->bucket.bhs[0] = lower_bh;
2280 xs->bucket.xh = (struct ocfs2_xattr_header *)
2281 xs->bucket.bhs[0]->b_data;
2282 lower_bh = NULL;
2283
2284 xs->header = xs->bucket.xh;
2285 xs->base = xs->bucket.bhs[0]->b_data;
2286 xs->end = xs->base + inode->i_sb->s_blocksize;
2287
2288 if (found) {
2289 /*
2290 * If we have found the xattr enty, read all the blocks in
2291 * this bucket.
2292 */
2293 ret = ocfs2_read_blocks(inode, xs->bucket.bhs[0]->b_blocknr + 1,
2294 blk_per_bucket - 1, &xs->bucket.bhs[1],
2295 0);
2296 if (ret) {
2297 mlog_errno(ret);
2298 goto out;
2299 }
2300
2301 xs->here = &xs->header->xh_entries[index];
2302 mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name,
2303 (unsigned long long)xs->bucket.bhs[0]->b_blocknr, index);
2304 } else
2305 ret = -ENODATA;
2306
2307 out:
2308 brelse(bh);
2309 brelse(lower_bh);
2310 return ret;
2311 }
2312
2313 static int ocfs2_xattr_index_block_find(struct inode *inode,
2314 struct buffer_head *root_bh,
2315 int name_index,
2316 const char *name,
2317 struct ocfs2_xattr_search *xs)
2318 {
2319 int ret;
2320 struct ocfs2_xattr_block *xb =
2321 (struct ocfs2_xattr_block *)root_bh->b_data;
2322 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
2323 struct ocfs2_extent_list *el = &xb_root->xt_list;
2324 u64 p_blkno = 0;
2325 u32 first_hash, num_clusters = 0;
2326 u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
2327
2328 if (le16_to_cpu(el->l_next_free_rec) == 0)
2329 return -ENODATA;
2330
2331 mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n",
2332 name, name_hash, name_index);
2333
2334 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
2335 &num_clusters, el);
2336 if (ret) {
2337 mlog_errno(ret);
2338 goto out;
2339 }
2340
2341 BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
2342
2343 mlog(0, "find xattr extent rec %u clusters from %llu, the first hash "
2344 "in the rec is %u\n", num_clusters, (unsigned long long)p_blkno,
2345 first_hash);
2346
2347 ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
2348 p_blkno, first_hash, num_clusters, xs);
2349
2350 out:
2351 return ret;
2352 }
2353
2354 static int ocfs2_iterate_xattr_buckets(struct inode *inode,
2355 u64 blkno,
2356 u32 clusters,
2357 xattr_bucket_func *func,
2358 void *para)
2359 {
2360 int i, j, ret = 0;
2361 int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2362 u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
2363 u32 num_buckets = clusters * bpc;
2364 struct ocfs2_xattr_bucket bucket;
2365
2366 memset(&bucket, 0, sizeof(bucket));
2367
2368 mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n",
2369 clusters, (unsigned long long)blkno);
2370
2371 for (i = 0; i < num_buckets; i++, blkno += blk_per_bucket) {
2372 ret = ocfs2_read_blocks(inode, blkno, blk_per_bucket,
2373 bucket.bhs, 0);
2374 if (ret) {
2375 mlog_errno(ret);
2376 goto out;
2377 }
2378
2379 bucket.xh = (struct ocfs2_xattr_header *)bucket.bhs[0]->b_data;
2380 /*
2381 * The real bucket num in this series of blocks is stored
2382 * in the 1st bucket.
2383 */
2384 if (i == 0)
2385 num_buckets = le16_to_cpu(bucket.xh->xh_num_buckets);
2386
2387 mlog(0, "iterating xattr bucket %llu, first hash %u\n",
2388 (unsigned long long)blkno,
2389 le32_to_cpu(bucket.xh->xh_entries[0].xe_name_hash));
2390 if (func) {
2391 ret = func(inode, &bucket, para);
2392 if (ret) {
2393 mlog_errno(ret);
2394 break;
2395 }
2396 }
2397
2398 for (j = 0; j < blk_per_bucket; j++)
2399 brelse(bucket.bhs[j]);
2400 memset(&bucket, 0, sizeof(bucket));
2401 }
2402
2403 out:
2404 for (j = 0; j < blk_per_bucket; j++)
2405 brelse(bucket.bhs[j]);
2406
2407 return ret;
2408 }
2409
2410 struct ocfs2_xattr_tree_list {
2411 char *buffer;
2412 size_t buffer_size;
2413 size_t result;
2414 };
2415
2416 static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
2417 struct ocfs2_xattr_header *xh,
2418 int index,
2419 int *block_off,
2420 int *new_offset)
2421 {
2422 u16 name_offset;
2423
2424 if (index < 0 || index >= le16_to_cpu(xh->xh_count))
2425 return -EINVAL;
2426
2427 name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
2428
2429 *block_off = name_offset >> inode->i_sb->s_blocksize_bits;
2430 *new_offset = name_offset % inode->i_sb->s_blocksize;
2431
2432 return 0;
2433 }
2434
2435 static int ocfs2_list_xattr_bucket(struct inode *inode,
2436 struct ocfs2_xattr_bucket *bucket,
2437 void *para)
2438 {
2439 int ret = 0, type;
2440 struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
2441 int i, block_off, new_offset;
2442 const char *prefix, *name;
2443
2444 for (i = 0 ; i < le16_to_cpu(bucket->xh->xh_count); i++) {
2445 struct ocfs2_xattr_entry *entry = &bucket->xh->xh_entries[i];
2446 type = ocfs2_xattr_get_type(entry);
2447 prefix = ocfs2_xattr_prefix(type);
2448
2449 if (prefix) {
2450 ret = ocfs2_xattr_bucket_get_name_value(inode,
2451 bucket->xh,
2452 i,
2453 &block_off,
2454 &new_offset);
2455 if (ret)
2456 break;
2457
2458 name = (const char *)bucket->bhs[block_off]->b_data +
2459 new_offset;
2460 ret = ocfs2_xattr_list_entry(xl->buffer,
2461 xl->buffer_size,
2462 &xl->result,
2463 prefix, name,
2464 entry->xe_name_len);
2465 if (ret)
2466 break;
2467 }
2468 }
2469
2470 return ret;
2471 }
2472
2473 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
2474 struct ocfs2_xattr_tree_root *xt,
2475 char *buffer,
2476 size_t buffer_size)
2477 {
2478 struct ocfs2_extent_list *el = &xt->xt_list;
2479 int ret = 0;
2480 u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
2481 u64 p_blkno = 0;
2482 struct ocfs2_xattr_tree_list xl = {
2483 .buffer = buffer,
2484 .buffer_size = buffer_size,
2485 .result = 0,
2486 };
2487
2488 if (le16_to_cpu(el->l_next_free_rec) == 0)
2489 return 0;
2490
2491 while (name_hash > 0) {
2492 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
2493 &e_cpos, &num_clusters, el);
2494 if (ret) {
2495 mlog_errno(ret);
2496 goto out;
2497 }
2498
2499 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
2500 ocfs2_list_xattr_bucket,
2501 &xl);
2502 if (ret) {
2503 mlog_errno(ret);
2504 goto out;
2505 }
2506
2507 if (e_cpos == 0)
2508 break;
2509
2510 name_hash = e_cpos - 1;
2511 }
2512
2513 ret = xl.result;
2514 out:
2515 return ret;
2516 }
2517
2518 static int cmp_xe(const void *a, const void *b)
2519 {
2520 const struct ocfs2_xattr_entry *l = a, *r = b;
2521 u32 l_hash = le32_to_cpu(l->xe_name_hash);
2522 u32 r_hash = le32_to_cpu(r->xe_name_hash);
2523
2524 if (l_hash > r_hash)
2525 return 1;
2526 if (l_hash < r_hash)
2527 return -1;
2528 return 0;
2529 }
2530
2531 static void swap_xe(void *a, void *b, int size)
2532 {
2533 struct ocfs2_xattr_entry *l = a, *r = b, tmp;
2534
2535 tmp = *l;
2536 memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
2537 memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
2538 }
2539
2540 /*
2541 * When the ocfs2_xattr_block is filled up, new bucket will be created
2542 * and all the xattr entries will be moved to the new bucket.
2543 * Note: we need to sort the entries since they are not saved in order
2544 * in the ocfs2_xattr_block.
2545 */
2546 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
2547 struct buffer_head *xb_bh,
2548 struct buffer_head *xh_bh,
2549 struct buffer_head *data_bh)
2550 {
2551 int i, blocksize = inode->i_sb->s_blocksize;
2552 u16 offset, size, off_change;
2553 struct ocfs2_xattr_entry *xe;
2554 struct ocfs2_xattr_block *xb =
2555 (struct ocfs2_xattr_block *)xb_bh->b_data;
2556 struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
2557 struct ocfs2_xattr_header *xh =
2558 (struct ocfs2_xattr_header *)xh_bh->b_data;
2559 u16 count = le16_to_cpu(xb_xh->xh_count);
2560 char *target = xh_bh->b_data, *src = xb_bh->b_data;
2561
2562 mlog(0, "cp xattr from block %llu to bucket %llu\n",
2563 (unsigned long long)xb_bh->b_blocknr,
2564 (unsigned long long)xh_bh->b_blocknr);
2565
2566 memset(xh_bh->b_data, 0, blocksize);
2567 if (data_bh)
2568 memset(data_bh->b_data, 0, blocksize);
2569 /*
2570 * Since the xe_name_offset is based on ocfs2_xattr_header,
2571 * there is a offset change corresponding to the change of
2572 * ocfs2_xattr_header's position.
2573 */
2574 off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
2575 xe = &xb_xh->xh_entries[count - 1];
2576 offset = le16_to_cpu(xe->xe_name_offset) + off_change;
2577 size = blocksize - offset;
2578
2579 /* copy all the names and values. */
2580 if (data_bh)
2581 target = data_bh->b_data;
2582 memcpy(target + offset, src + offset, size);
2583
2584 /* Init new header now. */
2585 xh->xh_count = xb_xh->xh_count;
2586 xh->xh_num_buckets = cpu_to_le16(1);
2587 xh->xh_name_value_len = cpu_to_le16(size);
2588 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
2589
2590 /* copy all the entries. */
2591 target = xh_bh->b_data;
2592 offset = offsetof(struct ocfs2_xattr_header, xh_entries);
2593 size = count * sizeof(struct ocfs2_xattr_entry);
2594 memcpy(target + offset, (char *)xb_xh + offset, size);
2595
2596 /* Change the xe offset for all the xe because of the move. */
2597 off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
2598 offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
2599 for (i = 0; i < count; i++)
2600 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
2601
2602 mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n",
2603 offset, size, off_change);
2604
2605 sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
2606 cmp_xe, swap_xe);
2607 }
2608
2609 /*
2610 * After we move xattr from block to index btree, we have to
2611 * update ocfs2_xattr_search to the new xe and base.
2612 *
2613 * When the entry is in xattr block, xattr_bh indicates the storage place.
2614 * While if the entry is in index b-tree, "bucket" indicates the
2615 * real place of the xattr.
2616 */
2617 static int ocfs2_xattr_update_xattr_search(struct inode *inode,
2618 struct ocfs2_xattr_search *xs,
2619 struct buffer_head *old_bh,
2620 struct buffer_head *new_bh)
2621 {
2622 int ret = 0;
2623 char *buf = old_bh->b_data;
2624 struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
2625 struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
2626 int i, blocksize = inode->i_sb->s_blocksize;
2627 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2628
2629 xs->bucket.bhs[0] = new_bh;
2630 get_bh(new_bh);
2631 xs->bucket.xh = (struct ocfs2_xattr_header *)xs->bucket.bhs[0]->b_data;
2632 xs->header = xs->bucket.xh;
2633
2634 xs->base = new_bh->b_data;
2635 xs->end = xs->base + inode->i_sb->s_blocksize;
2636
2637 if (!xs->not_found) {
2638 if (OCFS2_XATTR_BUCKET_SIZE != blocksize) {
2639 ret = ocfs2_read_blocks(inode,
2640 xs->bucket.bhs[0]->b_blocknr + 1,
2641 blk_per_bucket - 1, &xs->bucket.bhs[1],
2642 0);
2643 if (ret) {
2644 mlog_errno(ret);
2645 return ret;
2646 }
2647
2648 }
2649 i = xs->here - old_xh->xh_entries;
2650 xs->here = &xs->header->xh_entries[i];
2651 }
2652
2653 return ret;
2654 }
2655
2656 static int ocfs2_xattr_create_index_block(struct inode *inode,
2657 struct ocfs2_xattr_search *xs)
2658 {
2659 int ret, credits = OCFS2_SUBALLOC_ALLOC;
2660 u32 bit_off, len;
2661 u64 blkno;
2662 handle_t *handle;
2663 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2664 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2665 struct ocfs2_alloc_context *data_ac;
2666 struct buffer_head *xh_bh = NULL, *data_bh = NULL;
2667 struct buffer_head *xb_bh = xs->xattr_bh;
2668 struct ocfs2_xattr_block *xb =
2669 (struct ocfs2_xattr_block *)xb_bh->b_data;
2670 struct ocfs2_xattr_tree_root *xr;
2671 u16 xb_flags = le16_to_cpu(xb->xb_flags);
2672 u16 bpb = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2673
2674 mlog(0, "create xattr index block for %llu\n",
2675 (unsigned long long)xb_bh->b_blocknr);
2676
2677 BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
2678
2679 ret = ocfs2_reserve_clusters(osb, 1, &data_ac);
2680 if (ret) {
2681 mlog_errno(ret);
2682 goto out;
2683 }
2684
2685 /*
2686 * XXX:
2687 * We can use this lock for now, and maybe move to a dedicated mutex
2688 * if performance becomes a problem later.
2689 */
2690 down_write(&oi->ip_alloc_sem);
2691
2692 /*
2693 * 3 more credits, one for xattr block update, one for the 1st block
2694 * of the new xattr bucket and one for the value/data.
2695 */
2696 credits += 3;
2697 handle = ocfs2_start_trans(osb, credits);
2698 if (IS_ERR(handle)) {
2699 ret = PTR_ERR(handle);
2700 mlog_errno(ret);
2701 goto out_sem;
2702 }
2703
2704 ret = ocfs2_journal_access(handle, inode, xb_bh,
2705 OCFS2_JOURNAL_ACCESS_WRITE);
2706 if (ret) {
2707 mlog_errno(ret);
2708 goto out_commit;
2709 }
2710
2711 ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off, &len);
2712 if (ret) {
2713 mlog_errno(ret);
2714 goto out_commit;
2715 }
2716
2717 /*
2718 * The bucket may spread in many blocks, and
2719 * we will only touch the 1st block and the last block
2720 * in the whole bucket(one for entry and one for data).
2721 */
2722 blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
2723
2724 mlog(0, "allocate 1 cluster from %llu to xattr block\n",
2725 (unsigned long long)blkno);
2726
2727 xh_bh = sb_getblk(inode->i_sb, blkno);
2728 if (!xh_bh) {
2729 ret = -EIO;
2730 mlog_errno(ret);
2731 goto out_commit;
2732 }
2733
2734 ocfs2_set_new_buffer_uptodate(inode, xh_bh);
2735
2736 ret = ocfs2_journal_access(handle, inode, xh_bh,
2737 OCFS2_JOURNAL_ACCESS_CREATE);
2738 if (ret) {
2739 mlog_errno(ret);
2740 goto out_commit;
2741 }
2742
2743 if (bpb > 1) {
2744 data_bh = sb_getblk(inode->i_sb, blkno + bpb - 1);
2745 if (!data_bh) {
2746 ret = -EIO;
2747 mlog_errno(ret);
2748 goto out_commit;
2749 }
2750
2751 ocfs2_set_new_buffer_uptodate(inode, data_bh);
2752
2753 ret = ocfs2_journal_access(handle, inode, data_bh,
2754 OCFS2_JOURNAL_ACCESS_CREATE);
2755 if (ret) {
2756 mlog_errno(ret);
2757 goto out_commit;
2758 }
2759 }
2760
2761 ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xh_bh, data_bh);
2762
2763 ocfs2_journal_dirty(handle, xh_bh);
2764 if (data_bh)
2765 ocfs2_journal_dirty(handle, data_bh);
2766
2767 ret = ocfs2_xattr_update_xattr_search(inode, xs, xb_bh, xh_bh);
2768 if (ret) {
2769 mlog_errno(ret);
2770 goto out_commit;
2771 }
2772
2773 /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
2774 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
2775 offsetof(struct ocfs2_xattr_block, xb_attrs));
2776
2777 xr = &xb->xb_attrs.xb_root;
2778 xr->xt_clusters = cpu_to_le32(1);
2779 xr->xt_last_eb_blk = 0;
2780 xr->xt_list.l_tree_depth = 0;
2781 xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
2782 xr->xt_list.l_next_free_rec = cpu_to_le16(1);
2783
2784 xr->xt_list.l_recs[0].e_cpos = 0;
2785 xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
2786 xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
2787
2788 xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
2789
2790 ret = ocfs2_journal_dirty(handle, xb_bh);
2791 if (ret) {
2792 mlog_errno(ret);
2793 goto out_commit;
2794 }
2795
2796 out_commit:
2797 ocfs2_commit_trans(osb, handle);
2798
2799 out_sem:
2800 up_write(&oi->ip_alloc_sem);
2801
2802 out:
2803 if (data_ac)
2804 ocfs2_free_alloc_context(data_ac);
2805
2806 brelse(xh_bh);
2807 brelse(data_bh);
2808
2809 return ret;
2810 }
2811
2812 static int cmp_xe_offset(const void *a, const void *b)
2813 {
2814 const struct ocfs2_xattr_entry *l = a, *r = b;
2815 u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
2816 u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
2817
2818 if (l_name_offset < r_name_offset)
2819 return 1;
2820 if (l_name_offset > r_name_offset)
2821 return -1;
2822 return 0;
2823 }
2824
2825 /*
2826 * defrag a xattr bucket if we find that the bucket has some
2827 * holes beteen name/value pairs.
2828 * We will move all the name/value pairs to the end of the bucket
2829 * so that we can spare some space for insertion.
2830 */
2831 static int ocfs2_defrag_xattr_bucket(struct inode *inode,
2832 struct ocfs2_xattr_bucket *bucket)
2833 {
2834 int ret, i;
2835 size_t end, offset, len, value_len;
2836 struct ocfs2_xattr_header *xh;
2837 char *entries, *buf, *bucket_buf = NULL;
2838 u64 blkno = bucket->bhs[0]->b_blocknr;
2839 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2840 u16 xh_free_start;
2841 size_t blocksize = inode->i_sb->s_blocksize;
2842 handle_t *handle;
2843 struct buffer_head **bhs;
2844 struct ocfs2_xattr_entry *xe;
2845
2846 bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
2847 GFP_NOFS);
2848 if (!bhs)
2849 return -ENOMEM;
2850
2851 ret = ocfs2_read_blocks(inode, blkno, blk_per_bucket, bhs, 0);
2852 if (ret)
2853 goto out;
2854
2855 /*
2856 * In order to make the operation more efficient and generic,
2857 * we copy all the blocks into a contiguous memory and do the
2858 * defragment there, so if anything is error, we will not touch
2859 * the real block.
2860 */
2861 bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
2862 if (!bucket_buf) {
2863 ret = -EIO;
2864 goto out;
2865 }
2866
2867 buf = bucket_buf;
2868 for (i = 0; i < blk_per_bucket; i++, buf += blocksize)
2869 memcpy(buf, bhs[i]->b_data, blocksize);
2870
2871 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), blk_per_bucket);
2872 if (IS_ERR(handle)) {
2873 ret = PTR_ERR(handle);
2874 handle = NULL;
2875 mlog_errno(ret);
2876 goto out;
2877 }
2878
2879 for (i = 0; i < blk_per_bucket; i++) {
2880 ret = ocfs2_journal_access(handle, inode, bhs[i],
2881 OCFS2_JOURNAL_ACCESS_WRITE);
2882 if (ret < 0) {
2883 mlog_errno(ret);
2884 goto commit;
2885 }
2886 }
2887
2888 xh = (struct ocfs2_xattr_header *)bucket_buf;
2889 entries = (char *)xh->xh_entries;
2890 xh_free_start = le16_to_cpu(xh->xh_free_start);
2891
2892 mlog(0, "adjust xattr bucket in %llu, count = %u, "
2893 "xh_free_start = %u, xh_name_value_len = %u.\n",
2894 (unsigned long long)blkno, le16_to_cpu(xh->xh_count),
2895 xh_free_start, le16_to_cpu(xh->xh_name_value_len));
2896
2897 /*
2898 * sort all the entries by their offset.
2899 * the largest will be the first, so that we can
2900 * move them to the end one by one.
2901 */
2902 sort(entries, le16_to_cpu(xh->xh_count),
2903 sizeof(struct ocfs2_xattr_entry),
2904 cmp_xe_offset, swap_xe);
2905
2906 /* Move all name/values to the end of the bucket. */
2907 xe = xh->xh_entries;
2908 end = OCFS2_XATTR_BUCKET_SIZE;
2909 for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
2910 offset = le16_to_cpu(xe->xe_name_offset);
2911 if (ocfs2_xattr_is_local(xe))
2912 value_len = OCFS2_XATTR_SIZE(
2913 le64_to_cpu(xe->xe_value_size));
2914 else
2915 value_len = OCFS2_XATTR_ROOT_SIZE;
2916 len = OCFS2_XATTR_SIZE(xe->xe_name_len) + value_len;
2917
2918 /*
2919 * We must make sure that the name/value pair
2920 * exist in the same block. So adjust end to
2921 * the previous block end if needed.
2922 */
2923 if (((end - len) / blocksize !=
2924 (end - 1) / blocksize))
2925 end = end - end % blocksize;
2926
2927 if (end > offset + len) {
2928 memmove(bucket_buf + end - len,
2929 bucket_buf + offset, len);
2930 xe->xe_name_offset = cpu_to_le16(end - len);
2931 }
2932
2933 mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
2934 "bucket %llu\n", (unsigned long long)blkno);
2935
2936 end -= len;
2937 }
2938
2939 mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
2940 "bucket %llu\n", (unsigned long long)blkno);
2941
2942 if (xh_free_start == end)
2943 goto commit;
2944
2945 memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
2946 xh->xh_free_start = cpu_to_le16(end);
2947
2948 /* sort the entries by their name_hash. */
2949 sort(entries, le16_to_cpu(xh->xh_count),
2950 sizeof(struct ocfs2_xattr_entry),
2951 cmp_xe, swap_xe);
2952
2953 buf = bucket_buf;
2954 for (i = 0; i < blk_per_bucket; i++, buf += blocksize) {
2955 memcpy(bhs[i]->b_data, buf, blocksize);
2956 ocfs2_journal_dirty(handle, bhs[i]);
2957 }
2958
2959 commit:
2960 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
2961 out:
2962
2963 if (bhs) {
2964 for (i = 0; i < blk_per_bucket; i++)
2965 brelse(bhs[i]);
2966 }
2967 kfree(bhs);
2968
2969 kfree(bucket_buf);
2970 return ret;
2971 }
2972
2973 /*
2974 * Move half nums of the xattr bucket in the previous cluster to this new
2975 * cluster. We only touch the last cluster of the previous extend record.
2976 *
2977 * first_bh is the first buffer_head of a series of bucket in the same
2978 * extent rec and header_bh is the header of one bucket in this cluster.
2979 * They will be updated if we move the data header_bh contains to the new
2980 * cluster. first_hash will be set as the 1st xe's name_hash of the new cluster.
2981 */
2982 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
2983 handle_t *handle,
2984 struct buffer_head **first_bh,
2985 struct buffer_head **header_bh,
2986 u64 new_blkno,
2987 u64 prev_blkno,
2988 u32 num_clusters,
2989 u32 *first_hash)
2990 {
2991 int i, ret, credits;
2992 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2993 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
2994 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
2995 int blocksize = inode->i_sb->s_blocksize;
2996 struct buffer_head *old_bh, *new_bh, *prev_bh, *new_first_bh = NULL;
2997 struct ocfs2_xattr_header *new_xh;
2998 struct ocfs2_xattr_header *xh =
2999 (struct ocfs2_xattr_header *)((*first_bh)->b_data);
3000
3001 BUG_ON(le16_to_cpu(xh->xh_num_buckets) < num_buckets);
3002 BUG_ON(OCFS2_XATTR_BUCKET_SIZE == osb->s_clustersize);
3003
3004 prev_bh = *first_bh;
3005 get_bh(prev_bh);
3006 xh = (struct ocfs2_xattr_header *)prev_bh->b_data;
3007
3008 prev_blkno += (num_clusters - 1) * bpc + bpc / 2;
3009
3010 mlog(0, "move half of xattrs in cluster %llu to %llu\n",
3011 (unsigned long long)prev_blkno, (unsigned long long)new_blkno);
3012
3013 /*
3014 * We need to update the 1st half of the new cluster and
3015 * 1 more for the update of the 1st bucket of the previous
3016 * extent record.
3017 */
3018 credits = bpc / 2 + 1;
3019 ret = ocfs2_extend_trans(handle, credits);
3020 if (ret) {
3021 mlog_errno(ret);
3022 goto out;
3023 }
3024
3025 ret = ocfs2_journal_access(handle, inode, prev_bh,
3026 OCFS2_JOURNAL_ACCESS_WRITE);
3027 if (ret) {
3028 mlog_errno(ret);
3029 goto out;
3030 }
3031
3032 for (i = 0; i < bpc / 2; i++, prev_blkno++, new_blkno++) {
3033 old_bh = new_bh = NULL;
3034 new_bh = sb_getblk(inode->i_sb, new_blkno);
3035 if (!new_bh) {
3036 ret = -EIO;
3037 mlog_errno(ret);
3038 goto out;
3039 }
3040
3041 ocfs2_set_new_buffer_uptodate(inode, new_bh);
3042
3043 ret = ocfs2_journal_access(handle, inode, new_bh,
3044 OCFS2_JOURNAL_ACCESS_CREATE);
3045 if (ret < 0) {
3046 mlog_errno(ret);
3047 brelse(new_bh);
3048 goto out;
3049 }
3050
3051 ret = ocfs2_read_block(inode, prev_blkno, &old_bh);
3052 if (ret < 0) {
3053 mlog_errno(ret);
3054 brelse(new_bh);
3055 goto out;
3056 }
3057
3058 memcpy(new_bh->b_data, old_bh->b_data, blocksize);
3059
3060 if (i == 0) {
3061 new_xh = (struct ocfs2_xattr_header *)new_bh->b_data;
3062 new_xh->xh_num_buckets = cpu_to_le16(num_buckets / 2);
3063
3064 if (first_hash)
3065 *first_hash = le32_to_cpu(
3066 new_xh->xh_entries[0].xe_name_hash);
3067 new_first_bh = new_bh;
3068 get_bh(new_first_bh);
3069 }
3070
3071 ocfs2_journal_dirty(handle, new_bh);
3072
3073 if (*header_bh == old_bh) {
3074 brelse(*header_bh);
3075 *header_bh = new_bh;
3076 get_bh(*header_bh);
3077
3078 brelse(*first_bh);
3079 *first_bh = new_first_bh;
3080 get_bh(*first_bh);
3081 }
3082 brelse(new_bh);
3083 brelse(old_bh);
3084 }
3085
3086 le16_add_cpu(&xh->xh_num_buckets, -(num_buckets / 2));
3087
3088 ocfs2_journal_dirty(handle, prev_bh);
3089 out:
3090 brelse(prev_bh);
3091 brelse(new_first_bh);
3092 return ret;
3093 }
3094
3095 static int ocfs2_read_xattr_bucket(struct inode *inode,
3096 u64 blkno,
3097 struct buffer_head **bhs,
3098 int new)
3099 {
3100 int ret = 0;
3101 u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3102
3103 if (!new)
3104 return ocfs2_read_blocks(inode, blkno,
3105 blk_per_bucket, bhs, 0);
3106
3107 for (i = 0; i < blk_per_bucket; i++) {
3108 bhs[i] = sb_getblk(inode->i_sb, blkno + i);
3109 if (bhs[i] == NULL) {
3110 ret = -EIO;
3111 mlog_errno(ret);
3112 break;
3113 }
3114 ocfs2_set_new_buffer_uptodate(inode, bhs[i]);
3115 }
3116
3117 return ret;
3118 }
3119
3120 /*
3121 * Find the suitable pos when we divide a bucket into 2.
3122 * We have to make sure the xattrs with the same hash value exist
3123 * in the same bucket.
3124 *
3125 * If this ocfs2_xattr_header covers more than one hash value, find a
3126 * place where the hash value changes. Try to find the most even split.
3127 * The most common case is that all entries have different hash values,
3128 * and the first check we make will find a place to split.
3129 */
3130 static int ocfs2_xattr_find_divide_pos(struct ocfs2_xattr_header *xh)
3131 {
3132 struct ocfs2_xattr_entry *entries = xh->xh_entries;
3133 int count = le16_to_cpu(xh->xh_count);
3134 int delta, middle = count / 2;
3135
3136 /*
3137 * We start at the middle. Each step gets farther away in both
3138 * directions. We therefore hit the change in hash value
3139 * nearest to the middle. Note that this loop does not execute for
3140 * count < 2.
3141 */
3142 for (delta = 0; delta < middle; delta++) {
3143 /* Let's check delta earlier than middle */
3144 if (cmp_xe(&entries[middle - delta - 1],
3145 &entries[middle - delta]))
3146 return middle - delta;
3147
3148 /* For even counts, don't walk off the end */
3149 if ((middle + delta + 1) == count)
3150 continue;
3151
3152 /* Now try delta past middle */
3153 if (cmp_xe(&entries[middle + delta],
3154 &entries[middle + delta + 1]))
3155 return middle + delta + 1;
3156 }
3157
3158 /* Every entry had the same hash */
3159 return count;
3160 }
3161
3162 /*
3163 * Move some xattrs in old bucket(blk) to new bucket(new_blk).
3164 * first_hash will record the 1st hash of the new bucket.
3165 *
3166 * Normally half of the xattrs will be moved. But we have to make
3167 * sure that the xattrs with the same hash value are stored in the
3168 * same bucket. If all the xattrs in this bucket have the same hash
3169 * value, the new bucket will be initialized as an empty one and the
3170 * first_hash will be initialized as (hash_value+1).
3171 */
3172 static int ocfs2_divide_xattr_bucket(struct inode *inode,
3173 handle_t *handle,
3174 u64 blk,
3175 u64 new_blk,
3176 u32 *first_hash,
3177 int new_bucket_head)
3178 {
3179 int ret, i;
3180 int count, start, len, name_value_len = 0, xe_len, name_offset = 0;
3181 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3182 struct buffer_head **s_bhs, **t_bhs = NULL;
3183 struct ocfs2_xattr_header *xh;
3184 struct ocfs2_xattr_entry *xe;
3185 int blocksize = inode->i_sb->s_blocksize;
3186
3187 mlog(0, "move some of xattrs from bucket %llu to %llu\n",
3188 (unsigned long long)blk, (unsigned long long)new_blk);
3189
3190 s_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
3191 if (!s_bhs)
3192 return -ENOMEM;
3193
3194 ret = ocfs2_read_xattr_bucket(inode, blk, s_bhs, 0);
3195 if (ret) {
3196 mlog_errno(ret);
3197 goto out;
3198 }
3199
3200 ret = ocfs2_journal_access(handle, inode, s_bhs[0],
3201 OCFS2_JOURNAL_ACCESS_WRITE);
3202 if (ret) {
3203 mlog_errno(ret);
3204 goto out;
3205 }
3206
3207 t_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
3208 if (!t_bhs) {
3209 ret = -ENOMEM;
3210 goto out;
3211 }
3212
3213 ret = ocfs2_read_xattr_bucket(inode, new_blk, t_bhs, new_bucket_head);
3214 if (ret) {
3215 mlog_errno(ret);
3216 goto out;
3217 }
3218
3219 for (i = 0; i < blk_per_bucket; i++) {
3220 ret = ocfs2_journal_access(handle, inode, t_bhs[i],
3221 new_bucket_head ?
3222 OCFS2_JOURNAL_ACCESS_CREATE :
3223 OCFS2_JOURNAL_ACCESS_WRITE);
3224 if (ret) {
3225 mlog_errno(ret);
3226 goto out;
3227 }
3228 }
3229
3230 xh = (struct ocfs2_xattr_header *)s_bhs[0]->b_data;
3231 count = le16_to_cpu(xh->xh_count);
3232 start = ocfs2_xattr_find_divide_pos(xh);
3233
3234 if (start == count) {
3235 xe = &xh->xh_entries[start-1];
3236
3237 /*
3238 * initialized a new empty bucket here.
3239 * The hash value is set as one larger than
3240 * that of the last entry in the previous bucket.
3241 */
3242 for (i = 0; i < blk_per_bucket; i++)
3243 memset(t_bhs[i]->b_data, 0, blocksize);
3244
3245 xh = (struct ocfs2_xattr_header *)t_bhs[0]->b_data;
3246 xh->xh_free_start = cpu_to_le16(blocksize);
3247 xh->xh_entries[0].xe_name_hash = xe->xe_name_hash;
3248 le32_add_cpu(&xh->xh_entries[0].xe_name_hash, 1);
3249
3250 goto set_num_buckets;
3251 }
3252
3253 /* copy the whole bucket to the new first. */
3254 for (i = 0; i < blk_per_bucket; i++)
3255 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);
3256
3257 /* update the new bucket. */
3258 xh = (struct ocfs2_xattr_header *)t_bhs[0]->b_data;
3259
3260 /*
3261 * Calculate the total name/value len and xh_free_start for
3262 * the old bucket first.
3263 */
3264 name_offset = OCFS2_XATTR_BUCKET_SIZE;
3265 name_value_len = 0;
3266 for (i = 0; i < start; i++) {
3267 xe = &xh->xh_entries[i];
3268 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3269 if (ocfs2_xattr_is_local(xe))
3270 xe_len +=
3271 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3272 else
3273 xe_len += OCFS2_XATTR_ROOT_SIZE;
3274 name_value_len += xe_len;
3275 if (le16_to_cpu(xe->xe_name_offset) < name_offset)
3276 name_offset = le16_to_cpu(xe->xe_name_offset);
3277 }
3278
3279 /*
3280 * Now begin the modification to the new bucket.
3281 *
3282 * In the new bucket, We just move the xattr entry to the beginning
3283 * and don't touch the name/value. So there will be some holes in the
3284 * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
3285 * called.
3286 */
3287 xe = &xh->xh_entries[start];
3288 len = sizeof(struct ocfs2_xattr_entry) * (count - start);
3289 mlog(0, "mv xattr entry len %d from %d to %d\n", len,
3290 (int)((char *)xe - (char *)xh),
3291 (int)((char *)xh->xh_entries - (char *)xh));
3292 memmove((char *)xh->xh_entries, (char *)xe, len);
3293 xe = &xh->xh_entries[count - start];
3294 len = sizeof(struct ocfs2_xattr_entry) * start;
3295 memset((char *)xe, 0, len);
3296
3297 le16_add_cpu(&xh->xh_count, -start);
3298 le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
3299
3300 /* Calculate xh_free_start for the new bucket. */
3301 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
3302 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3303 xe = &xh->xh_entries[i];
3304 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3305 if (ocfs2_xattr_is_local(xe))
3306 xe_len +=
3307 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3308 else
3309 xe_len += OCFS2_XATTR_ROOT_SIZE;
3310 if (le16_to_cpu(xe->xe_name_offset) <
3311 le16_to_cpu(xh->xh_free_start))
3312 xh->xh_free_start = xe->xe_name_offset;
3313 }
3314
3315 set_num_buckets:
3316 /* set xh->xh_num_buckets for the new xh. */
3317 if (new_bucket_head)
3318 xh->xh_num_buckets = cpu_to_le16(1);
3319 else
3320 xh->xh_num_buckets = 0;
3321
3322 for (i = 0; i < blk_per_bucket; i++) {
3323 ocfs2_journal_dirty(handle, t_bhs[i]);
3324 if (ret)
3325 mlog_errno(ret);
3326 }
3327
3328 /* store the first_hash of the new bucket. */
3329 if (first_hash)
3330 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3331
3332 /*
3333 * Now only update the 1st block of the old bucket. If we
3334 * just added a new empty bucket, there is no need to modify
3335 * it.
3336 */
3337 if (start == count)
3338 goto out;
3339
3340 xh = (struct ocfs2_xattr_header *)s_bhs[0]->b_data;
3341 memset(&xh->xh_entries[start], 0,
3342 sizeof(struct ocfs2_xattr_entry) * (count - start));
3343 xh->xh_count = cpu_to_le16(start);
3344 xh->xh_free_start = cpu_to_le16(name_offset);
3345 xh->xh_name_value_len = cpu_to_le16(name_value_len);
3346
3347 ocfs2_journal_dirty(handle, s_bhs[0]);
3348 if (ret)
3349 mlog_errno(ret);
3350
3351 out:
3352 if (s_bhs) {
3353 for (i = 0; i < blk_per_bucket; i++)
3354 brelse(s_bhs[i]);
3355 }
3356 kfree(s_bhs);
3357
3358 if (t_bhs) {
3359 for (i = 0; i < blk_per_bucket; i++)
3360 brelse(t_bhs[i]);
3361 }
3362 kfree(t_bhs);
3363
3364 return ret;
3365 }
3366
3367 /*
3368 * Copy xattr from one bucket to another bucket.
3369 *
3370 * The caller must make sure that the journal transaction
3371 * has enough space for journaling.
3372 */
3373 static int ocfs2_cp_xattr_bucket(struct inode *inode,
3374 handle_t *handle,
3375 u64 s_blkno,
3376 u64 t_blkno,
3377 int t_is_new)
3378 {
3379 int ret, i;
3380 int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3381 int blocksize = inode->i_sb->s_blocksize;
3382 struct buffer_head **s_bhs, **t_bhs = NULL;
3383
3384 BUG_ON(s_blkno == t_blkno);
3385
3386 mlog(0, "cp bucket %llu to %llu, target is %d\n",
3387 (unsigned long long)s_blkno, (unsigned long long)t_blkno,
3388 t_is_new);
3389
3390 s_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
3391 GFP_NOFS);
3392 if (!s_bhs)
3393 return -ENOMEM;
3394
3395 ret = ocfs2_read_xattr_bucket(inode, s_blkno, s_bhs, 0);
3396 if (ret)
3397 goto out;
3398
3399 t_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
3400 GFP_NOFS);
3401 if (!t_bhs) {
3402 ret = -ENOMEM;
3403 goto out;
3404 }
3405
3406 ret = ocfs2_read_xattr_bucket(inode, t_blkno, t_bhs, t_is_new);
3407 if (ret)
3408 goto out;
3409
3410 for (i = 0; i < blk_per_bucket; i++) {
3411 ret = ocfs2_journal_access(handle, inode, t_bhs[i],
3412 t_is_new ?
3413 OCFS2_JOURNAL_ACCESS_CREATE :
3414 OCFS2_JOURNAL_ACCESS_WRITE);
3415 if (ret)
3416 goto out;
3417 }
3418
3419 for (i = 0; i < blk_per_bucket; i++) {
3420 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);
3421 ocfs2_journal_dirty(handle, t_bhs[i]);
3422 }
3423
3424 out:
3425 if (s_bhs) {
3426 for (i = 0; i < blk_per_bucket; i++)
3427 brelse(s_bhs[i]);
3428 }
3429 kfree(s_bhs);
3430
3431 if (t_bhs) {
3432 for (i = 0; i < blk_per_bucket; i++)
3433 brelse(t_bhs[i]);
3434 }
3435 kfree(t_bhs);
3436
3437 return ret;
3438 }
3439
3440 /*
3441 * Copy one xattr cluster from src_blk to to_blk.
3442 * The to_blk will become the first bucket header of the cluster, so its
3443 * xh_num_buckets will be initialized as the bucket num in the cluster.
3444 */
3445 static int ocfs2_cp_xattr_cluster(struct inode *inode,
3446 handle_t *handle,
3447 struct buffer_head *first_bh,
3448 u64 src_blk,
3449 u64 to_blk,
3450 u32 *first_hash)
3451 {
3452 int i, ret, credits;
3453 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3454 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3455 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
3456 struct buffer_head *bh = NULL;
3457 struct ocfs2_xattr_header *xh;
3458 u64 to_blk_start = to_blk;
3459
3460 mlog(0, "cp xattrs from cluster %llu to %llu\n",
3461 (unsigned long long)src_blk, (unsigned long long)to_blk);
3462
3463 /*
3464 * We need to update the new cluster and 1 more for the update of
3465 * the 1st bucket of the previous extent rec.
3466 */
3467 credits = bpc + 1;
3468 ret = ocfs2_extend_trans(handle, credits);
3469 if (ret) {
3470 mlog_errno(ret);
3471 goto out;
3472 }
3473
3474 ret = ocfs2_journal_access(handle, inode, first_bh,
3475 OCFS2_JOURNAL_ACCESS_WRITE);
3476 if (ret) {
3477 mlog_errno(ret);
3478 goto out;
3479 }
3480
3481 for (i = 0; i < num_buckets; i++) {
3482 ret = ocfs2_cp_xattr_bucket(inode, handle,
3483 src_blk, to_blk, 1);
3484 if (ret) {
3485 mlog_errno(ret);
3486 goto out;
3487 }
3488
3489 src_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3490 to_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3491 }
3492
3493 /* update the old bucket header. */
3494 xh = (struct ocfs2_xattr_header *)first_bh->b_data;
3495 le16_add_cpu(&xh->xh_num_buckets, -num_buckets);
3496
3497 ocfs2_journal_dirty(handle, first_bh);
3498
3499 /* update the new bucket header. */
3500 ret = ocfs2_read_block(inode, to_blk_start, &bh);
3501 if (ret < 0) {
3502 mlog_errno(ret);
3503 goto out;
3504 }
3505
3506 ret = ocfs2_journal_access(handle, inode, bh,
3507 OCFS2_JOURNAL_ACCESS_WRITE);
3508 if (ret) {
3509 mlog_errno(ret);
3510 goto out;
3511 }
3512
3513 xh = (struct ocfs2_xattr_header *)bh->b_data;
3514 xh->xh_num_buckets = cpu_to_le16(num_buckets);
3515
3516 ocfs2_journal_dirty(handle, bh);
3517
3518 if (first_hash)
3519 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3520 out:
3521 brelse(bh);
3522 return ret;
3523 }
3524
3525 /*
3526 * Move some xattrs in this cluster to the new cluster.
3527 * This function should only be called when bucket size == cluster size.
3528 * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
3529 */
3530 static int ocfs2_divide_xattr_cluster(struct inode *inode,
3531 handle_t *handle,
3532 u64 prev_blk,
3533 u64 new_blk,
3534 u32 *first_hash)
3535 {
3536 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3537 int ret, credits = 2 * blk_per_bucket;
3538
3539 BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
3540
3541 ret = ocfs2_extend_trans(handle, credits);
3542 if (ret) {
3543 mlog_errno(ret);
3544 return ret;
3545 }
3546
3547 /* Move half of the xattr in start_blk to the next bucket. */
3548 return ocfs2_divide_xattr_bucket(inode, handle, prev_blk,
3549 new_blk, first_hash, 1);
3550 }
3551
3552 /*
3553 * Move some xattrs from the old cluster to the new one since they are not
3554 * contiguous in ocfs2 xattr tree.
3555 *
3556 * new_blk starts a new separate cluster, and we will move some xattrs from
3557 * prev_blk to it. v_start will be set as the first name hash value in this
3558 * new cluster so that it can be used as e_cpos during tree insertion and
3559 * don't collide with our original b-tree operations. first_bh and header_bh
3560 * will also be updated since they will be used in ocfs2_extend_xattr_bucket
3561 * to extend the insert bucket.
3562 *
3563 * The problem is how much xattr should we move to the new one and when should
3564 * we update first_bh and header_bh?
3565 * 1. If cluster size > bucket size, that means the previous cluster has more
3566 * than 1 bucket, so just move half nums of bucket into the new cluster and
3567 * update the first_bh and header_bh if the insert bucket has been moved
3568 * to the new cluster.
3569 * 2. If cluster_size == bucket_size:
3570 * a) If the previous extent rec has more than one cluster and the insert
3571 * place isn't in the last cluster, copy the entire last cluster to the
3572 * new one. This time, we don't need to upate the first_bh and header_bh
3573 * since they will not be moved into the new cluster.
3574 * b) Otherwise, move the bottom half of the xattrs in the last cluster into
3575 * the new one. And we set the extend flag to zero if the insert place is
3576 * moved into the new allocated cluster since no extend is needed.
3577 */
3578 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
3579 handle_t *handle,
3580 struct buffer_head **first_bh,
3581 struct buffer_head **header_bh,
3582 u64 new_blk,
3583 u64 prev_blk,
3584 u32 prev_clusters,
3585 u32 *v_start,
3586 int *extend)
3587 {
3588 int ret = 0;
3589 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3590
3591 mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n",
3592 (unsigned long long)prev_blk, prev_clusters,
3593 (unsigned long long)new_blk);
3594
3595 if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1)
3596 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
3597 handle,
3598 first_bh,
3599 header_bh,
3600 new_blk,
3601 prev_blk,
3602 prev_clusters,
3603 v_start);
3604 else {
3605 u64 last_blk = prev_blk + bpc * (prev_clusters - 1);
3606
3607 if (prev_clusters > 1 && (*header_bh)->b_blocknr != last_blk)
3608 ret = ocfs2_cp_xattr_cluster(inode, handle, *first_bh,
3609 last_blk, new_blk,
3610 v_start);
3611 else {
3612 ret = ocfs2_divide_xattr_cluster(inode, handle,
3613 last_blk, new_blk,
3614 v_start);
3615
3616 if ((*header_bh)->b_blocknr == last_blk && extend)
3617 *extend = 0;
3618 }
3619 }
3620
3621 return ret;
3622 }
3623
3624 /*
3625 * Add a new cluster for xattr storage.
3626 *
3627 * If the new cluster is contiguous with the previous one, it will be
3628 * appended to the same extent record, and num_clusters will be updated.
3629 * If not, we will insert a new extent for it and move some xattrs in
3630 * the last cluster into the new allocated one.
3631 * We also need to limit the maximum size of a btree leaf, otherwise we'll
3632 * lose the benefits of hashing because we'll have to search large leaves.
3633 * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
3634 * if it's bigger).
3635 *
3636 * first_bh is the first block of the previous extent rec and header_bh
3637 * indicates the bucket we will insert the new xattrs. They will be updated
3638 * when the header_bh is moved into the new cluster.
3639 */
3640 static int ocfs2_add_new_xattr_cluster(struct inode *inode,
3641 struct buffer_head *root_bh,
3642 struct buffer_head **first_bh,
3643 struct buffer_head **header_bh,
3644 u32 *num_clusters,
3645 u32 prev_cpos,
3646 u64 prev_blkno,
3647 int *extend)
3648 {
3649 int ret, credits;
3650 u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3651 u32 prev_clusters = *num_clusters;
3652 u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
3653 u64 block;
3654 handle_t *handle = NULL;
3655 struct ocfs2_alloc_context *data_ac = NULL;
3656 struct ocfs2_alloc_context *meta_ac = NULL;
3657 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3658 struct ocfs2_extent_tree et;
3659
3660 mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, "
3661 "previous xattr blkno = %llu\n",
3662 (unsigned long long)OCFS2_I(inode)->ip_blkno,
3663 prev_cpos, (unsigned long long)prev_blkno);
3664
3665 ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
3666
3667 ret = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
3668 &data_ac, &meta_ac);
3669 if (ret) {
3670 mlog_errno(ret);
3671 goto leave;
3672 }
3673
3674 credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el,
3675 clusters_to_add);
3676 handle = ocfs2_start_trans(osb, credits);
3677 if (IS_ERR(handle)) {
3678 ret = PTR_ERR(handle);
3679 handle = NULL;
3680 mlog_errno(ret);
3681 goto leave;
3682 }
3683
3684 ret = ocfs2_journal_access(handle, inode, root_bh,
3685 OCFS2_JOURNAL_ACCESS_WRITE);
3686 if (ret < 0) {
3687 mlog_errno(ret);
3688 goto leave;
3689 }
3690
3691 ret = __ocfs2_claim_clusters(osb, handle, data_ac, 1,
3692 clusters_to_add, &bit_off, &num_bits);
3693 if (ret < 0) {
3694 if (ret != -ENOSPC)
3695 mlog_errno(ret);
3696 goto leave;
3697 }
3698
3699 BUG_ON(num_bits > clusters_to_add);
3700
3701 block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
3702 mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n",
3703 num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
3704
3705 if (prev_blkno + prev_clusters * bpc == block &&
3706 (prev_clusters + num_bits) << osb->s_clustersize_bits <=
3707 OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
3708 /*
3709 * If this cluster is contiguous with the old one and
3710 * adding this new cluster, we don't surpass the limit of
3711 * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
3712 * initialized and used like other buckets in the previous
3713 * cluster.
3714 * So add it as a contiguous one. The caller will handle
3715 * its init process.
3716 */
3717 v_start = prev_cpos + prev_clusters;
3718 *num_clusters = prev_clusters + num_bits;
3719 mlog(0, "Add contiguous %u clusters to previous extent rec.\n",
3720 num_bits);
3721 } else {
3722 ret = ocfs2_adjust_xattr_cross_cluster(inode,
3723 handle,
3724 first_bh,
3725 header_bh,
3726 block,
3727 prev_blkno,
3728 prev_clusters,
3729 &v_start,
3730 extend);
3731 if (ret) {
3732 mlog_errno(ret);
3733 goto leave;
3734 }
3735 }
3736
3737 if (handle->h_buffer_credits < credits) {
3738 /*
3739 * The journal has been restarted before, and don't
3740 * have enough space for the insertion, so extend it
3741 * here.
3742 */
3743 ret = ocfs2_extend_trans(handle, credits);
3744 if (ret) {
3745 mlog_errno(ret);
3746 goto leave;
3747 }
3748 }
3749 mlog(0, "Insert %u clusters at block %llu for xattr at %u\n",
3750 num_bits, (unsigned long long)block, v_start);
3751 ret = ocfs2_insert_extent(osb, handle, inode, &et, v_start, block,
3752 num_bits, 0, meta_ac);
3753 if (ret < 0) {
3754 mlog_errno(ret);
3755 goto leave;
3756 }
3757
3758 ret = ocfs2_journal_dirty(handle, root_bh);
3759 if (ret < 0) {
3760 mlog_errno(ret);
3761 goto leave;
3762 }
3763
3764 leave:
3765 if (handle)
3766 ocfs2_commit_trans(osb, handle);
3767 if (data_ac)
3768 ocfs2_free_alloc_context(data_ac);
3769 if (meta_ac)
3770 ocfs2_free_alloc_context(meta_ac);
3771
3772 return ret;
3773 }
3774
3775 /*
3776 * Extend a new xattr bucket and move xattrs to the end one by one until
3777 * We meet with start_bh. Only move half of the xattrs to the bucket after it.
3778 */
3779 static int ocfs2_extend_xattr_bucket(struct inode *inode,
3780 struct buffer_head *first_bh,
3781 struct buffer_head *start_bh,
3782 u32 num_clusters)
3783 {
3784 int ret, credits;
3785 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3786 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3787 u64 start_blk = start_bh->b_blocknr, end_blk;
3788 u32 num_buckets = num_clusters * ocfs2_xattr_buckets_per_cluster(osb);
3789 handle_t *handle;
3790 struct ocfs2_xattr_header *first_xh =
3791 (struct ocfs2_xattr_header *)first_bh->b_data;
3792 u16 bucket = le16_to_cpu(first_xh->xh_num_buckets);
3793
3794 mlog(0, "extend xattr bucket in %llu, xattr extend rec starting "
3795 "from %llu, len = %u\n", (unsigned long long)start_blk,
3796 (unsigned long long)first_bh->b_blocknr, num_clusters);
3797
3798 BUG_ON(bucket >= num_buckets);
3799
3800 end_blk = first_bh->b_blocknr + (bucket - 1) * blk_per_bucket;
3801
3802 /*
3803 * We will touch all the buckets after the start_bh(include it).
3804 * Add one more bucket and modify the first_bh.
3805 */
3806 credits = end_blk - start_blk + 2 * blk_per_bucket + 1;
3807 handle = ocfs2_start_trans(osb, credits);
3808 if (IS_ERR(handle)) {
3809 ret = PTR_ERR(handle);
3810 handle = NULL;
3811 mlog_errno(ret);
3812 goto out;
3813 }
3814
3815 ret = ocfs2_journal_access(handle, inode, first_bh,
3816 OCFS2_JOURNAL_ACCESS_WRITE);
3817 if (ret) {
3818 mlog_errno(ret);
3819 goto commit;
3820 }
3821
3822 while (end_blk != start_blk) {
3823 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
3824 end_blk + blk_per_bucket, 0);
3825 if (ret)
3826 goto commit;
3827 end_blk -= blk_per_bucket;
3828 }
3829
3830 /* Move half of the xattr in start_blk to the next bucket. */
3831 ret = ocfs2_divide_xattr_bucket(inode, handle, start_blk,
3832 start_blk + blk_per_bucket, NULL, 0);
3833
3834 le16_add_cpu(&first_xh->xh_num_buckets, 1);
3835 ocfs2_journal_dirty(handle, first_bh);
3836
3837 commit:
3838 ocfs2_commit_trans(osb, handle);
3839 out:
3840 return ret;
3841 }
3842
3843 /*
3844 * Add new xattr bucket in an extent record and adjust the buckets accordingly.
3845 * xb_bh is the ocfs2_xattr_block.
3846 * We will move all the buckets starting from header_bh to the next place. As
3847 * for this one, half num of its xattrs will be moved to the next one.
3848 *
3849 * We will allocate a new cluster if current cluster is full and adjust
3850 * header_bh and first_bh if the insert place is moved to the new cluster.
3851 */
3852 static int ocfs2_add_new_xattr_bucket(struct inode *inode,
3853 struct buffer_head *xb_bh,
3854 struct buffer_head *header_bh)
3855 {
3856 struct ocfs2_xattr_header *first_xh = NULL;
3857 struct buffer_head *first_bh = NULL;
3858 struct ocfs2_xattr_block *xb =
3859 (struct ocfs2_xattr_block *)xb_bh->b_data;
3860 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3861 struct ocfs2_extent_list *el = &xb_root->xt_list;
3862 struct ocfs2_xattr_header *xh =
3863 (struct ocfs2_xattr_header *)header_bh->b_data;
3864 u32 name_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3865 struct super_block *sb = inode->i_sb;
3866 struct ocfs2_super *osb = OCFS2_SB(sb);
3867 int ret, num_buckets, extend = 1;
3868 u64 p_blkno;
3869 u32 e_cpos, num_clusters;
3870
3871 mlog(0, "Add new xattr bucket starting form %llu\n",
3872 (unsigned long long)header_bh->b_blocknr);
3873
3874 /*
3875 * Add refrence for header_bh here because it may be
3876 * changed in ocfs2_add_new_xattr_cluster and we need
3877 * to free it in the end.
3878 */
3879 get_bh(header_bh);
3880
3881 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
3882 &num_clusters, el);
3883 if (ret) {
3884 mlog_errno(ret);
3885 goto out;
3886 }
3887
3888 ret = ocfs2_read_block(inode, p_blkno, &first_bh);
3889 if (ret) {
3890 mlog_errno(ret);
3891 goto out;
3892 }
3893
3894 num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
3895 first_xh = (struct ocfs2_xattr_header *)first_bh->b_data;
3896
3897 if (num_buckets == le16_to_cpu(first_xh->xh_num_buckets)) {
3898 ret = ocfs2_add_new_xattr_cluster(inode,
3899 xb_bh,
3900 &first_bh,
3901 &header_bh,
3902 &num_clusters,
3903 e_cpos,
3904 p_blkno,
3905 &extend);
3906 if (ret) {
3907 mlog_errno(ret);
3908 goto out;
3909 }
3910 }
3911
3912 if (extend)
3913 ret = ocfs2_extend_xattr_bucket(inode,
3914 first_bh,
3915 header_bh,
3916 num_clusters);
3917 if (ret)
3918 mlog_errno(ret);
3919 out:
3920 brelse(first_bh);
3921 brelse(header_bh);
3922 return ret;
3923 }
3924
3925 static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode,
3926 struct ocfs2_xattr_bucket *bucket,
3927 int offs)
3928 {
3929 int block_off = offs >> inode->i_sb->s_blocksize_bits;
3930
3931 offs = offs % inode->i_sb->s_blocksize;
3932 return bucket->bhs[block_off]->b_data + offs;
3933 }
3934
3935 /*
3936 * Handle the normal xattr set, including replace, delete and new.
3937 *
3938 * Note: "local" indicates the real data's locality. So we can't
3939 * just its bucket locality by its length.
3940 */
3941 static void ocfs2_xattr_set_entry_normal(struct inode *inode,
3942 struct ocfs2_xattr_info *xi,
3943 struct ocfs2_xattr_search *xs,
3944 u32 name_hash,
3945 int local)
3946 {
3947 struct ocfs2_xattr_entry *last, *xe;
3948 int name_len = strlen(xi->name);
3949 struct ocfs2_xattr_header *xh = xs->header;
3950 u16 count = le16_to_cpu(xh->xh_count), start;
3951 size_t blocksize = inode->i_sb->s_blocksize;
3952 char *val;
3953 size_t offs, size, new_size;
3954
3955 last = &xh->xh_entries[count];
3956 if (!xs->not_found) {
3957 xe = xs->here;
3958 offs = le16_to_cpu(xe->xe_name_offset);
3959 if (ocfs2_xattr_is_local(xe))
3960 size = OCFS2_XATTR_SIZE(name_len) +
3961 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3962 else
3963 size = OCFS2_XATTR_SIZE(name_len) +
3964 OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
3965
3966 /*
3967 * If the new value will be stored outside, xi->value has been
3968 * initalized as an empty ocfs2_xattr_value_root, and the same
3969 * goes with xi->value_len, so we can set new_size safely here.
3970 * See ocfs2_xattr_set_in_bucket.
3971 */
3972 new_size = OCFS2_XATTR_SIZE(name_len) +
3973 OCFS2_XATTR_SIZE(xi->value_len);
3974
3975 le16_add_cpu(&xh->xh_name_value_len, -size);
3976 if (xi->value) {
3977 if (new_size > size)
3978 goto set_new_name_value;
3979
3980 /* Now replace the old value with new one. */
3981 if (local)
3982 xe->xe_value_size = cpu_to_le64(xi->value_len);
3983 else
3984 xe->xe_value_size = 0;
3985
3986 val = ocfs2_xattr_bucket_get_val(inode,
3987 &xs->bucket, offs);
3988 memset(val + OCFS2_XATTR_SIZE(name_len), 0,
3989 size - OCFS2_XATTR_SIZE(name_len));
3990 if (OCFS2_XATTR_SIZE(xi->value_len) > 0)
3991 memcpy(val + OCFS2_XATTR_SIZE(name_len),
3992 xi->value, xi->value_len);
3993
3994 le16_add_cpu(&xh->xh_name_value_len, new_size);
3995 ocfs2_xattr_set_local(xe, local);
3996 return;
3997 } else {
3998 /*
3999 * Remove the old entry if there is more than one.
4000 * We don't remove the last entry so that we can
4001 * use it to indicate the hash value of the empty
4002 * bucket.
4003 */
4004 last -= 1;
4005 le16_add_cpu(&xh->xh_count, -1);
4006 if (xh->xh_count) {
4007 memmove(xe, xe + 1,
4008 (void *)last - (void *)xe);
4009 memset(last, 0,
4010 sizeof(struct ocfs2_xattr_entry));
4011 } else
4012 xh->xh_free_start =
4013 cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
4014
4015 return;
4016 }
4017 } else {
4018 /* find a new entry for insert. */
4019 int low = 0, high = count - 1, tmp;
4020 struct ocfs2_xattr_entry *tmp_xe;
4021
4022 while (low <= high && count) {
4023 tmp = (low + high) / 2;
4024 tmp_xe = &xh->xh_entries[tmp];
4025
4026 if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
4027 low = tmp + 1;
4028 else if (name_hash <
4029 le32_to_cpu(tmp_xe->xe_name_hash))
4030 high = tmp - 1;
4031 else {
4032 low = tmp;
4033 break;
4034 }
4035 }
4036
4037 xe = &xh->xh_entries[low];
4038 if (low != count)
4039 memmove(xe + 1, xe, (void *)last - (void *)xe);
4040
4041 le16_add_cpu(&xh->xh_count, 1);
4042 memset(xe, 0, sizeof(struct ocfs2_xattr_entry));
4043 xe->xe_name_hash = cpu_to_le32(name_hash);
4044 xe->xe_name_len = name_len;
4045 ocfs2_xattr_set_type(xe, xi->name_index);
4046 }
4047
4048 set_new_name_value:
4049 /* Insert the new name+value. */
4050 size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len);
4051
4052 /*
4053 * We must make sure that the name/value pair
4054 * exists in the same block.
4055 */
4056 offs = le16_to_cpu(xh->xh_free_start);
4057 start = offs - size;
4058
4059 if (start >> inode->i_sb->s_blocksize_bits !=
4060 (offs - 1) >> inode->i_sb->s_blocksize_bits) {
4061 offs = offs - offs % blocksize;
4062 xh->xh_free_start = cpu_to_le16(offs);
4063 }
4064
4065 val = ocfs2_xattr_bucket_get_val(inode,
4066 &xs->bucket, offs - size);
4067 xe->xe_name_offset = cpu_to_le16(offs - size);
4068
4069 memset(val, 0, size);
4070 memcpy(val, xi->name, name_len);
4071 memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len);
4072
4073 xe->xe_value_size = cpu_to_le64(xi->value_len);
4074 ocfs2_xattr_set_local(xe, local);
4075 xs->here = xe;
4076 le16_add_cpu(&xh->xh_free_start, -size);
4077 le16_add_cpu(&xh->xh_name_value_len, size);
4078
4079 return;
4080 }
4081
4082 static int ocfs2_xattr_bucket_handle_journal(struct inode *inode,
4083 handle_t *handle,
4084 struct ocfs2_xattr_search *xs,
4085 struct buffer_head **bhs,
4086 u16 bh_num)
4087 {
4088 int ret = 0, off, block_off;
4089 struct ocfs2_xattr_entry *xe = xs->here;
4090
4091 /*
4092 * First calculate all the blocks we should journal_access
4093 * and journal_dirty. The first block should always be touched.
4094 */
4095 ret = ocfs2_journal_dirty(handle, bhs[0]);
4096 if (ret)
4097 mlog_errno(ret);
4098
4099 /* calc the data. */
4100 off = le16_to_cpu(xe->xe_name_offset);
4101 block_off = off >> inode->i_sb->s_blocksize_bits;
4102 ret = ocfs2_journal_dirty(handle, bhs[block_off]);
4103 if (ret)
4104 mlog_errno(ret);
4105
4106 return ret;
4107 }
4108
4109 /*
4110 * Set the xattr entry in the specified bucket.
4111 * The bucket is indicated by xs->bucket and it should have the enough
4112 * space for the xattr insertion.
4113 */
4114 static int ocfs2_xattr_set_entry_in_bucket(struct inode *inode,
4115 struct ocfs2_xattr_info *xi,
4116 struct ocfs2_xattr_search *xs,
4117 u32 name_hash,
4118 int local)
4119 {
4120 int i, ret;
4121 handle_t *handle = NULL;
4122 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4123 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4124
4125 mlog(0, "Set xattr entry len = %lu index = %d in bucket %llu\n",
4126 (unsigned long)xi->value_len, xi->name_index,
4127 (unsigned long long)xs->bucket.bhs[0]->b_blocknr);
4128
4129 if (!xs->bucket.bhs[1]) {
4130 ret = ocfs2_read_blocks(inode,
4131 xs->bucket.bhs[0]->b_blocknr + 1,
4132 blk_per_bucket - 1, &xs->bucket.bhs[1],
4133 0);
4134 if (ret) {
4135 mlog_errno(ret);
4136 goto out;
4137 }
4138 }
4139
4140 handle = ocfs2_start_trans(osb, blk_per_bucket);
4141 if (IS_ERR(handle)) {
4142 ret = PTR_ERR(handle);
4143 handle = NULL;
4144 mlog_errno(ret);
4145 goto out;
4146 }
4147
4148 for (i = 0; i < blk_per_bucket; i++) {
4149 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[i],
4150 OCFS2_JOURNAL_ACCESS_WRITE);
4151 if (ret < 0) {
4152 mlog_errno(ret);
4153 goto out;
4154 }
4155 }
4156
4157 ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash, local);
4158
4159 /*Only dirty the blocks we have touched in set xattr. */
4160 ret = ocfs2_xattr_bucket_handle_journal(inode, handle, xs,
4161 xs->bucket.bhs, blk_per_bucket);
4162 if (ret)
4163 mlog_errno(ret);
4164 out:
4165 ocfs2_commit_trans(osb, handle);
4166
4167 return ret;
4168 }
4169
4170 static int ocfs2_xattr_value_update_size(struct inode *inode,
4171 struct buffer_head *xe_bh,
4172 struct ocfs2_xattr_entry *xe,
4173 u64 new_size)
4174 {
4175 int ret;
4176 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4177 handle_t *handle = NULL;
4178
4179 handle = ocfs2_start_trans(osb, 1);
4180 if (IS_ERR(handle)) {
4181 ret = -ENOMEM;
4182 mlog_errno(ret);
4183 goto out;
4184 }
4185
4186 ret = ocfs2_journal_access(handle, inode, xe_bh,
4187 OCFS2_JOURNAL_ACCESS_WRITE);
4188 if (ret < 0) {
4189 mlog_errno(ret);
4190 goto out_commit;
4191 }
4192
4193 xe->xe_value_size = cpu_to_le64(new_size);
4194
4195 ret = ocfs2_journal_dirty(handle, xe_bh);
4196 if (ret < 0)
4197 mlog_errno(ret);
4198
4199 out_commit:
4200 ocfs2_commit_trans(osb, handle);
4201 out:
4202 return ret;
4203 }
4204
4205 /*
4206 * Truncate the specified xe_off entry in xattr bucket.
4207 * bucket is indicated by header_bh and len is the new length.
4208 * Both the ocfs2_xattr_value_root and the entry will be updated here.
4209 *
4210 * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
4211 */
4212 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
4213 struct buffer_head *header_bh,
4214 int xe_off,
4215 int len)
4216 {
4217 int ret, offset;
4218 u64 value_blk;
4219 struct buffer_head *value_bh = NULL;
4220 struct ocfs2_xattr_value_root *xv;
4221 struct ocfs2_xattr_entry *xe;
4222 struct ocfs2_xattr_header *xh =
4223 (struct ocfs2_xattr_header *)header_bh->b_data;
4224 size_t blocksize = inode->i_sb->s_blocksize;
4225
4226 xe = &xh->xh_entries[xe_off];
4227
4228 BUG_ON(!xe || ocfs2_xattr_is_local(xe));
4229
4230 offset = le16_to_cpu(xe->xe_name_offset) +
4231 OCFS2_XATTR_SIZE(xe->xe_name_len);
4232
4233 value_blk = offset / blocksize;
4234
4235 /* We don't allow ocfs2_xattr_value to be stored in different block. */
4236 BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
4237 value_blk += header_bh->b_blocknr;
4238
4239 ret = ocfs2_read_block(inode, value_blk, &value_bh);
4240 if (ret) {
4241 mlog_errno(ret);
4242 goto out;
4243 }
4244
4245 xv = (struct ocfs2_xattr_value_root *)
4246 (value_bh->b_data + offset % blocksize);
4247
4248 mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n",
4249 xe_off, (unsigned long long)header_bh->b_blocknr, len);
4250 ret = ocfs2_xattr_value_truncate(inode, value_bh, xv, len);
4251 if (ret) {
4252 mlog_errno(ret);
4253 goto out;
4254 }
4255
4256 ret = ocfs2_xattr_value_update_size(inode, header_bh, xe, len);
4257 if (ret) {
4258 mlog_errno(ret);
4259 goto out;
4260 }
4261
4262 out:
4263 brelse(value_bh);
4264 return ret;
4265 }
4266
4267 static int ocfs2_xattr_bucket_value_truncate_xs(struct inode *inode,
4268 struct ocfs2_xattr_search *xs,
4269 int len)
4270 {
4271 int ret, offset;
4272 struct ocfs2_xattr_entry *xe = xs->here;
4273 struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xs->base;
4274
4275 BUG_ON(!xs->bucket.bhs[0] || !xe || ocfs2_xattr_is_local(xe));
4276
4277 offset = xe - xh->xh_entries;
4278 ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket.bhs[0],
4279 offset, len);
4280 if (ret)
4281 mlog_errno(ret);
4282
4283 return ret;
4284 }
4285
4286 static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode,
4287 struct ocfs2_xattr_search *xs,
4288 char *val,
4289 int value_len)
4290 {
4291 int offset;
4292 struct ocfs2_xattr_value_root *xv;
4293 struct ocfs2_xattr_entry *xe = xs->here;
4294
4295 BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe));
4296
4297 offset = le16_to_cpu(xe->xe_name_offset) +
4298 OCFS2_XATTR_SIZE(xe->xe_name_len);
4299
4300 xv = (struct ocfs2_xattr_value_root *)(xs->base + offset);
4301
4302 return __ocfs2_xattr_set_value_outside(inode, xv, val, value_len);
4303 }
4304
4305 static int ocfs2_rm_xattr_cluster(struct inode *inode,
4306 struct buffer_head *root_bh,
4307 u64 blkno,
4308 u32 cpos,
4309 u32 len)
4310 {
4311 int ret;
4312 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4313 struct inode *tl_inode = osb->osb_tl_inode;
4314 handle_t *handle;
4315 struct ocfs2_xattr_block *xb =
4316 (struct ocfs2_xattr_block *)root_bh->b_data;
4317 struct ocfs2_alloc_context *meta_ac = NULL;
4318 struct ocfs2_cached_dealloc_ctxt dealloc;
4319 struct ocfs2_extent_tree et;
4320
4321 ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
4322
4323 ocfs2_init_dealloc_ctxt(&dealloc);
4324
4325 mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n",
4326 cpos, len, (unsigned long long)blkno);
4327
4328 ocfs2_remove_xattr_clusters_from_cache(inode, blkno, len);
4329
4330 ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
4331 if (ret) {
4332 mlog_errno(ret);
4333 return ret;
4334 }
4335
4336 mutex_lock(&tl_inode->i_mutex);
4337
4338 if (ocfs2_truncate_log_needs_flush(osb)) {
4339 ret = __ocfs2_flush_truncate_log(osb);
4340 if (ret < 0) {
4341 mlog_errno(ret);
4342 goto out;
4343 }
4344 }
4345
4346 handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
4347 if (IS_ERR(handle)) {
4348 ret = -ENOMEM;
4349 mlog_errno(ret);
4350 goto out;
4351 }
4352
4353 ret = ocfs2_journal_access(handle, inode, root_bh,
4354 OCFS2_JOURNAL_ACCESS_WRITE);
4355 if (ret) {
4356 mlog_errno(ret);
4357 goto out_commit;
4358 }
4359
4360 ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
4361 &dealloc);
4362 if (ret) {
4363 mlog_errno(ret);
4364 goto out_commit;
4365 }
4366
4367 le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
4368
4369 ret = ocfs2_journal_dirty(handle, root_bh);
4370 if (ret) {
4371 mlog_errno(ret);
4372 goto out_commit;
4373 }
4374
4375 ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
4376 if (ret)
4377 mlog_errno(ret);
4378
4379 out_commit:
4380 ocfs2_commit_trans(osb, handle);
4381 out:
4382 ocfs2_schedule_truncate_log_flush(osb, 1);
4383
4384 mutex_unlock(&tl_inode->i_mutex);
4385
4386 if (meta_ac)
4387 ocfs2_free_alloc_context(meta_ac);
4388
4389 ocfs2_run_deallocs(osb, &dealloc);
4390
4391 return ret;
4392 }
4393
4394 static void ocfs2_xattr_bucket_remove_xs(struct inode *inode,
4395 struct ocfs2_xattr_search *xs)
4396 {
4397 handle_t *handle = NULL;
4398 struct ocfs2_xattr_header *xh = xs->bucket.xh;
4399 struct ocfs2_xattr_entry *last = &xh->xh_entries[
4400 le16_to_cpu(xh->xh_count) - 1];
4401 int ret = 0;
4402
4403 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1);
4404 if (IS_ERR(handle)) {
4405 ret = PTR_ERR(handle);
4406 mlog_errno(ret);
4407 return;
4408 }
4409
4410 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[0],
4411 OCFS2_JOURNAL_ACCESS_WRITE);
4412 if (ret) {
4413 mlog_errno(ret);
4414 goto out_commit;
4415 }
4416
4417 /* Remove the old entry. */
4418 memmove(xs->here, xs->here + 1,
4419 (void *)last - (void *)xs->here);
4420 memset(last, 0, sizeof(struct ocfs2_xattr_entry));
4421 le16_add_cpu(&xh->xh_count, -1);
4422
4423 ret = ocfs2_journal_dirty(handle, xs->bucket.bhs[0]);
4424 if (ret < 0)
4425 mlog_errno(ret);
4426 out_commit:
4427 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
4428 }
4429
4430 /*
4431 * Set the xattr name/value in the bucket specified in xs.
4432 *
4433 * As the new value in xi may be stored in the bucket or in an outside cluster,
4434 * we divide the whole process into 3 steps:
4435 * 1. insert name/value in the bucket(ocfs2_xattr_set_entry_in_bucket)
4436 * 2. truncate of the outside cluster(ocfs2_xattr_bucket_value_truncate_xs)
4437 * 3. Set the value to the outside cluster(ocfs2_xattr_bucket_set_value_outside)
4438 * 4. If the clusters for the new outside value can't be allocated, we need
4439 * to free the xattr we allocated in set.
4440 */
4441 static int ocfs2_xattr_set_in_bucket(struct inode *inode,
4442 struct ocfs2_xattr_info *xi,
4443 struct ocfs2_xattr_search *xs)
4444 {
4445 int ret, local = 1;
4446 size_t value_len;
4447 char *val = (char *)xi->value;
4448 struct ocfs2_xattr_entry *xe = xs->here;
4449 u32 name_hash = ocfs2_xattr_name_hash(inode, xi->name,
4450 strlen(xi->name));
4451
4452 if (!xs->not_found && !ocfs2_xattr_is_local(xe)) {
4453 /*
4454 * We need to truncate the xattr storage first.
4455 *
4456 * If both the old and new value are stored to
4457 * outside block, we only need to truncate
4458 * the storage and then set the value outside.
4459 *
4460 * If the new value should be stored within block,
4461 * we should free all the outside block first and
4462 * the modification to the xattr block will be done
4463 * by following steps.
4464 */
4465 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
4466 value_len = xi->value_len;
4467 else
4468 value_len = 0;
4469
4470 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
4471 value_len);
4472 if (ret)
4473 goto out;
4474
4475 if (value_len)
4476 goto set_value_outside;
4477 }
4478
4479 value_len = xi->value_len;
4480 /* So we have to handle the inside block change now. */
4481 if (value_len > OCFS2_XATTR_INLINE_SIZE) {
4482 /*
4483 * If the new value will be stored outside of block,
4484 * initalize a new empty value root and insert it first.
4485 */
4486 local = 0;
4487 xi->value = &def_xv;
4488 xi->value_len = OCFS2_XATTR_ROOT_SIZE;
4489 }
4490
4491 ret = ocfs2_xattr_set_entry_in_bucket(inode, xi, xs, name_hash, local);
4492 if (ret) {
4493 mlog_errno(ret);
4494 goto out;
4495 }
4496
4497 if (value_len <= OCFS2_XATTR_INLINE_SIZE)
4498 goto out;
4499
4500 /* allocate the space now for the outside block storage. */
4501 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
4502 value_len);
4503 if (ret) {
4504 mlog_errno(ret);
4505
4506 if (xs->not_found) {
4507 /*
4508 * We can't allocate enough clusters for outside
4509 * storage and we have allocated xattr already,
4510 * so need to remove it.
4511 */
4512 ocfs2_xattr_bucket_remove_xs(inode, xs);
4513 }
4514 goto out;
4515 }
4516
4517 set_value_outside:
4518 ret = ocfs2_xattr_bucket_set_value_outside(inode, xs, val, value_len);
4519 out:
4520 return ret;
4521 }
4522
4523 /*
4524 * check whether the xattr bucket is filled up with the same hash value.
4525 * If we want to insert the xattr with the same hash, return -ENOSPC.
4526 * If we want to insert a xattr with different hash value, go ahead
4527 * and ocfs2_divide_xattr_bucket will handle this.
4528 */
4529 static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
4530 struct ocfs2_xattr_bucket *bucket,
4531 const char *name)
4532 {
4533 struct ocfs2_xattr_header *xh = bucket->xh;
4534 u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
4535
4536 if (name_hash != le32_to_cpu(xh->xh_entries[0].xe_name_hash))
4537 return 0;
4538
4539 if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
4540 xh->xh_entries[0].xe_name_hash) {
4541 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
4542 "hash = %u\n",
4543 (unsigned long long)bucket->bhs[0]->b_blocknr,
4544 le32_to_cpu(xh->xh_entries[0].xe_name_hash));
4545 return -ENOSPC;
4546 }
4547
4548 return 0;
4549 }
4550
4551 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
4552 struct ocfs2_xattr_info *xi,
4553 struct ocfs2_xattr_search *xs)
4554 {
4555 struct ocfs2_xattr_header *xh;
4556 struct ocfs2_xattr_entry *xe;
4557 u16 count, header_size, xh_free_start;
4558 int i, free, max_free, need, old;
4559 size_t value_size = 0, name_len = strlen(xi->name);
4560 size_t blocksize = inode->i_sb->s_blocksize;
4561 int ret, allocation = 0;
4562 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4563
4564 mlog_entry("Set xattr %s in xattr index block\n", xi->name);
4565
4566 try_again:
4567 xh = xs->header;
4568 count = le16_to_cpu(xh->xh_count);
4569 xh_free_start = le16_to_cpu(xh->xh_free_start);
4570 header_size = sizeof(struct ocfs2_xattr_header) +
4571 count * sizeof(struct ocfs2_xattr_entry);
4572 max_free = OCFS2_XATTR_BUCKET_SIZE -
4573 le16_to_cpu(xh->xh_name_value_len) - header_size;
4574
4575 mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size "
4576 "of %u which exceed block size\n",
4577 (unsigned long long)xs->bucket.bhs[0]->b_blocknr,
4578 header_size);
4579
4580 if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE)
4581 value_size = OCFS2_XATTR_ROOT_SIZE;
4582 else if (xi->value)
4583 value_size = OCFS2_XATTR_SIZE(xi->value_len);
4584
4585 if (xs->not_found)
4586 need = sizeof(struct ocfs2_xattr_entry) +
4587 OCFS2_XATTR_SIZE(name_len) + value_size;
4588 else {
4589 need = value_size + OCFS2_XATTR_SIZE(name_len);
4590
4591 /*
4592 * We only replace the old value if the new length is smaller
4593 * than the old one. Otherwise we will allocate new space in the
4594 * bucket to store it.
4595 */
4596 xe = xs->here;
4597 if (ocfs2_xattr_is_local(xe))
4598 old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
4599 else
4600 old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
4601
4602 if (old >= value_size)
4603 need = 0;
4604 }
4605
4606 free = xh_free_start - header_size;
4607 /*
4608 * We need to make sure the new name/value pair
4609 * can exist in the same block.
4610 */
4611 if (xh_free_start % blocksize < need)
4612 free -= xh_free_start % blocksize;
4613
4614 mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, "
4615 "need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len ="
4616 " %u\n", xs->not_found,
4617 (unsigned long long)xs->bucket.bhs[0]->b_blocknr,
4618 free, need, max_free, le16_to_cpu(xh->xh_free_start),
4619 le16_to_cpu(xh->xh_name_value_len));
4620
4621 if (free < need || count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
4622 if (need <= max_free &&
4623 count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
4624 /*
4625 * We can create the space by defragment. Since only the
4626 * name/value will be moved, the xe shouldn't be changed
4627 * in xs.
4628 */
4629 ret = ocfs2_defrag_xattr_bucket(inode, &xs->bucket);
4630 if (ret) {
4631 mlog_errno(ret);
4632 goto out;
4633 }
4634
4635 xh_free_start = le16_to_cpu(xh->xh_free_start);
4636 free = xh_free_start - header_size;
4637 if (xh_free_start % blocksize < need)
4638 free -= xh_free_start % blocksize;
4639
4640 if (free >= need)
4641 goto xattr_set;
4642
4643 mlog(0, "Can't get enough space for xattr insert by "
4644 "defragment. Need %u bytes, but we have %d, so "
4645 "allocate new bucket for it.\n", need, free);
4646 }
4647
4648 /*
4649 * We have to add new buckets or clusters and one
4650 * allocation should leave us enough space for insert.
4651 */
4652 BUG_ON(allocation);
4653
4654 /*
4655 * We do not allow for overlapping ranges between buckets. And
4656 * the maximum number of collisions we will allow for then is
4657 * one bucket's worth, so check it here whether we need to
4658 * add a new bucket for the insert.
4659 */
4660 ret = ocfs2_check_xattr_bucket_collision(inode,
4661 &xs->bucket,
4662 xi->name);
4663 if (ret) {
4664 mlog_errno(ret);
4665 goto out;
4666 }
4667
4668 ret = ocfs2_add_new_xattr_bucket(inode,
4669 xs->xattr_bh,
4670 xs->bucket.bhs[0]);
4671 if (ret) {
4672 mlog_errno(ret);
4673 goto out;
4674 }
4675
4676 for (i = 0; i < blk_per_bucket; i++)
4677 brelse(xs->bucket.bhs[i]);
4678
4679 memset(&xs->bucket, 0, sizeof(xs->bucket));
4680
4681 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
4682 xi->name_index,
4683 xi->name, xs);
4684 if (ret && ret != -ENODATA)
4685 goto out;
4686 xs->not_found = ret;
4687 allocation = 1;
4688 goto try_again;
4689 }
4690
4691 xattr_set:
4692 ret = ocfs2_xattr_set_in_bucket(inode, xi, xs);
4693 out:
4694 mlog_exit(ret);
4695 return ret;
4696 }
4697
4698 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
4699 struct ocfs2_xattr_bucket *bucket,
4700 void *para)
4701 {
4702 int ret = 0;
4703 struct ocfs2_xattr_header *xh = bucket->xh;
4704 u16 i;
4705 struct ocfs2_xattr_entry *xe;
4706
4707 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
4708 xe = &xh->xh_entries[i];
4709 if (ocfs2_xattr_is_local(xe))
4710 continue;
4711
4712 ret = ocfs2_xattr_bucket_value_truncate(inode,
4713 bucket->bhs[0],
4714 i, 0);
4715 if (ret) {
4716 mlog_errno(ret);
4717 break;
4718 }
4719 }
4720
4721 return ret;
4722 }
4723
4724 static int ocfs2_delete_xattr_index_block(struct inode *inode,
4725 struct buffer_head *xb_bh)
4726 {
4727 struct ocfs2_xattr_block *xb =
4728 (struct ocfs2_xattr_block *)xb_bh->b_data;
4729 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
4730 int ret = 0;
4731 u32 name_hash = UINT_MAX, e_cpos, num_clusters;
4732 u64 p_blkno;
4733
4734 if (le16_to_cpu(el->l_next_free_rec) == 0)
4735 return 0;
4736
4737 while (name_hash > 0) {
4738 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
4739 &e_cpos, &num_clusters, el);
4740 if (ret) {
4741 mlog_errno(ret);
4742 goto out;
4743 }
4744
4745 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
4746 ocfs2_delete_xattr_in_bucket,
4747 NULL);
4748 if (ret) {
4749 mlog_errno(ret);
4750 goto out;
4751 }
4752
4753 ret = ocfs2_rm_xattr_cluster(inode, xb_bh,
4754 p_blkno, e_cpos, num_clusters);
4755 if (ret) {
4756 mlog_errno(ret);
4757 break;
4758 }
4759
4760 if (e_cpos == 0)
4761 break;
4762
4763 name_hash = e_cpos - 1;
4764 }
4765
4766 out:
4767 return ret;
4768 }
4769
4770 /*
4771 * 'trusted' attributes support
4772 */
4773 static size_t ocfs2_xattr_trusted_list(struct inode *inode, char *list,
4774 size_t list_size, const char *name,
4775 size_t name_len)
4776 {
4777 const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
4778 const size_t total_len = prefix_len + name_len + 1;
4779
4780 if (list && total_len <= list_size) {
4781 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
4782 memcpy(list + prefix_len, name, name_len);
4783 list[prefix_len + name_len] = '\0';
4784 }
4785 return total_len;
4786 }
4787
4788 static int ocfs2_xattr_trusted_get(struct inode *inode, const char *name,
4789 void *buffer, size_t size)
4790 {
4791 if (strcmp(name, "") == 0)
4792 return -EINVAL;
4793 return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_TRUSTED, name,
4794 buffer, size);
4795 }
4796
4797 static int ocfs2_xattr_trusted_set(struct inode *inode, const char *name,
4798 const void *value, size_t size, int flags)
4799 {
4800 if (strcmp(name, "") == 0)
4801 return -EINVAL;
4802
4803 return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_TRUSTED, name, value,
4804 size, flags);
4805 }
4806
4807 struct xattr_handler ocfs2_xattr_trusted_handler = {
4808 .prefix = XATTR_TRUSTED_PREFIX,
4809 .list = ocfs2_xattr_trusted_list,
4810 .get = ocfs2_xattr_trusted_get,
4811 .set = ocfs2_xattr_trusted_set,
4812 };
4813
4814 /*
4815 * 'user' attributes support
4816 */
4817 static size_t ocfs2_xattr_user_list(struct inode *inode, char *list,
4818 size_t list_size, const char *name,
4819 size_t name_len)
4820 {
4821 const size_t prefix_len = XATTR_USER_PREFIX_LEN;
4822 const size_t total_len = prefix_len + name_len + 1;
4823 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4824
4825 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
4826 return 0;
4827
4828 if (list && total_len <= list_size) {
4829 memcpy(list, XATTR_USER_PREFIX, prefix_len);
4830 memcpy(list + prefix_len, name, name_len);
4831 list[prefix_len + name_len] = '\0';
4832 }
4833 return total_len;
4834 }
4835
4836 static int ocfs2_xattr_user_get(struct inode *inode, const char *name,
4837 void *buffer, size_t size)
4838 {
4839 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4840
4841 if (strcmp(name, "") == 0)
4842 return -EINVAL;
4843 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
4844 return -EOPNOTSUPP;
4845 return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_USER, name,
4846 buffer, size);
4847 }
4848
4849 static int ocfs2_xattr_user_set(struct inode *inode, const char *name,
4850 const void *value, size_t size, int flags)
4851 {
4852 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4853
4854 if (strcmp(name, "") == 0)
4855 return -EINVAL;
4856 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
4857 return -EOPNOTSUPP;
4858
4859 return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_USER, name, value,
4860 size, flags);
4861 }
4862
4863 struct xattr_handler ocfs2_xattr_user_handler = {
4864 .prefix = XATTR_USER_PREFIX,
4865 .list = ocfs2_xattr_user_list,
4866 .get = ocfs2_xattr_user_get,
4867 .set = ocfs2_xattr_user_set,
4868 };
Linux with added FPC-III support