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ocfs2: Simplify ocfs2_read_block()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ocfs2 / xattr.c
blobc25780a70dfd6757864c68ed685df1537a6a2937
1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * xattr.c
5 *
6 * Copyright (C) 2008 Oracle. All rights reserved.
7 *
8 * CREDITS:
9 * Lots of code in this file is taken from ext3.
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public
13 * License as published by the Free Software Foundation; either
14 * version 2 of the License, or (at your option) any later version.
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 * You should have received a copy of the GNU General Public
22 * License along with this program; if not, write to the
23 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24 * Boston, MA 021110-1307, USA.
25 */
26
27 #include <linux/capability.h>
28 #include <linux/fs.h>
29 #include <linux/types.h>
30 #include <linux/slab.h>
31 #include <linux/highmem.h>
32 #include <linux/pagemap.h>
33 #include <linux/uio.h>
34 #include <linux/sched.h>
35 #include <linux/splice.h>
36 #include <linux/mount.h>
37 #include <linux/writeback.h>
38 #include <linux/falloc.h>
39 #include <linux/sort.h>
40 #include <linux/init.h>
41 #include <linux/module.h>
42 #include <linux/string.h>
43
44 #define MLOG_MASK_PREFIX ML_XATTR
45 #include <cluster/masklog.h>
46
47 #include "ocfs2.h"
48 #include "alloc.h"
49 #include "dlmglue.h"
50 #include "file.h"
51 #include "symlink.h"
52 #include "sysfile.h"
53 #include "inode.h"
54 #include "journal.h"
55 #include "ocfs2_fs.h"
56 #include "suballoc.h"
57 #include "uptodate.h"
58 #include "buffer_head_io.h"
59 #include "super.h"
60 #include "xattr.h"
61
62
63 struct ocfs2_xattr_def_value_root {
64 struct ocfs2_xattr_value_root xv;
65 struct ocfs2_extent_rec er;
66 };
67
68 struct ocfs2_xattr_bucket {
69 struct buffer_head *bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET];
70 struct ocfs2_xattr_header *xh;
71 };
72
73 #define OCFS2_XATTR_ROOT_SIZE (sizeof(struct ocfs2_xattr_def_value_root))
74 #define OCFS2_XATTR_INLINE_SIZE 80
75
76 static struct ocfs2_xattr_def_value_root def_xv = {
77 .xv.xr_list.l_count = cpu_to_le16(1),
78 };
79
80 struct xattr_handler *ocfs2_xattr_handlers[] = {
81 &ocfs2_xattr_user_handler,
82 &ocfs2_xattr_trusted_handler,
83 NULL
84 };
85
86 static struct xattr_handler *ocfs2_xattr_handler_map[] = {
87 [OCFS2_XATTR_INDEX_USER] = &ocfs2_xattr_user_handler,
88 [OCFS2_XATTR_INDEX_TRUSTED] = &ocfs2_xattr_trusted_handler,
89 };
90
91 struct ocfs2_xattr_info {
92 int name_index;
93 const char *name;
94 const void *value;
95 size_t value_len;
96 };
97
98 struct ocfs2_xattr_search {
99 struct buffer_head *inode_bh;
100 /*
101 * xattr_bh point to the block buffer head which has extended attribute
102 * when extended attribute in inode, xattr_bh is equal to inode_bh.
103 */
104 struct buffer_head *xattr_bh;
105 struct ocfs2_xattr_header *header;
106 struct ocfs2_xattr_bucket bucket;
107 void *base;
108 void *end;
109 struct ocfs2_xattr_entry *here;
110 int not_found;
111 };
112
113 static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
114 struct ocfs2_xattr_header *xh,
115 int index,
116 int *block_off,
117 int *new_offset);
118
119 static int ocfs2_xattr_index_block_find(struct inode *inode,
120 struct buffer_head *root_bh,
121 int name_index,
122 const char *name,
123 struct ocfs2_xattr_search *xs);
124
125 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
126 struct ocfs2_xattr_tree_root *xt,
127 char *buffer,
128 size_t buffer_size);
129
130 static int ocfs2_xattr_create_index_block(struct inode *inode,
131 struct ocfs2_xattr_search *xs);
132
133 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
134 struct ocfs2_xattr_info *xi,
135 struct ocfs2_xattr_search *xs);
136
137 static int ocfs2_delete_xattr_index_block(struct inode *inode,
138 struct buffer_head *xb_bh);
139
140 static inline const char *ocfs2_xattr_prefix(int name_index)
141 {
142 struct xattr_handler *handler = NULL;
143
144 if (name_index > 0 && name_index < OCFS2_XATTR_MAX)
145 handler = ocfs2_xattr_handler_map[name_index];
146
147 return handler ? handler->prefix : NULL;
148 }
149
150 static u32 ocfs2_xattr_name_hash(struct inode *inode,
151 const char *name,
152 int name_len)
153 {
154 /* Get hash value of uuid from super block */
155 u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash;
156 int i;
157
158 /* hash extended attribute name */
159 for (i = 0; i < name_len; i++) {
160 hash = (hash << OCFS2_HASH_SHIFT) ^
161 (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
162 *name++;
163 }
164
165 return hash;
166 }
167
168 /*
169 * ocfs2_xattr_hash_entry()
170 *
171 * Compute the hash of an extended attribute.
172 */
173 static void ocfs2_xattr_hash_entry(struct inode *inode,
174 struct ocfs2_xattr_header *header,
175 struct ocfs2_xattr_entry *entry)
176 {
177 u32 hash = 0;
178 char *name = (char *)header + le16_to_cpu(entry->xe_name_offset);
179
180 hash = ocfs2_xattr_name_hash(inode, name, entry->xe_name_len);
181 entry->xe_name_hash = cpu_to_le32(hash);
182
183 return;
184 }
185
186 static int ocfs2_xattr_extend_allocation(struct inode *inode,
187 u32 clusters_to_add,
188 struct buffer_head *xattr_bh,
189 struct ocfs2_xattr_value_root *xv)
190 {
191 int status = 0;
192 int restart_func = 0;
193 int credits = 0;
194 handle_t *handle = NULL;
195 struct ocfs2_alloc_context *data_ac = NULL;
196 struct ocfs2_alloc_context *meta_ac = NULL;
197 enum ocfs2_alloc_restarted why;
198 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
199 u32 prev_clusters, logical_start = le32_to_cpu(xv->xr_clusters);
200 struct ocfs2_extent_tree et;
201
202 mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add);
203
204 ocfs2_init_xattr_value_extent_tree(&et, inode, xattr_bh, xv);
205
206 restart_all:
207
208 status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
209 &data_ac, &meta_ac);
210 if (status) {
211 mlog_errno(status);
212 goto leave;
213 }
214
215 credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el,
216 clusters_to_add);
217 handle = ocfs2_start_trans(osb, credits);
218 if (IS_ERR(handle)) {
219 status = PTR_ERR(handle);
220 handle = NULL;
221 mlog_errno(status);
222 goto leave;
223 }
224
225 restarted_transaction:
226 status = ocfs2_journal_access(handle, inode, xattr_bh,
227 OCFS2_JOURNAL_ACCESS_WRITE);
228 if (status < 0) {
229 mlog_errno(status);
230 goto leave;
231 }
232
233 prev_clusters = le32_to_cpu(xv->xr_clusters);
234 status = ocfs2_add_clusters_in_btree(osb,
235 inode,
236 &logical_start,
237 clusters_to_add,
238 0,
239 &et,
240 handle,
241 data_ac,
242 meta_ac,
243 &why);
244 if ((status < 0) && (status != -EAGAIN)) {
245 if (status != -ENOSPC)
246 mlog_errno(status);
247 goto leave;
248 }
249
250 status = ocfs2_journal_dirty(handle, xattr_bh);
251 if (status < 0) {
252 mlog_errno(status);
253 goto leave;
254 }
255
256 clusters_to_add -= le32_to_cpu(xv->xr_clusters) - prev_clusters;
257
258 if (why != RESTART_NONE && clusters_to_add) {
259 if (why == RESTART_META) {
260 mlog(0, "restarting function.\n");
261 restart_func = 1;
262 } else {
263 BUG_ON(why != RESTART_TRANS);
264
265 mlog(0, "restarting transaction.\n");
266 /* TODO: This can be more intelligent. */
267 credits = ocfs2_calc_extend_credits(osb->sb,
268 et.et_root_el,
269 clusters_to_add);
270 status = ocfs2_extend_trans(handle, credits);
271 if (status < 0) {
272 /* handle still has to be committed at
273 * this point. */
274 status = -ENOMEM;
275 mlog_errno(status);
276 goto leave;
277 }
278 goto restarted_transaction;
279 }
280 }
281
282 leave:
283 if (handle) {
284 ocfs2_commit_trans(osb, handle);
285 handle = NULL;
286 }
287 if (data_ac) {
288 ocfs2_free_alloc_context(data_ac);
289 data_ac = NULL;
290 }
291 if (meta_ac) {
292 ocfs2_free_alloc_context(meta_ac);
293 meta_ac = NULL;
294 }
295 if ((!status) && restart_func) {
296 restart_func = 0;
297 goto restart_all;
298 }
299
300 return status;
301 }
302
303 static int __ocfs2_remove_xattr_range(struct inode *inode,
304 struct buffer_head *root_bh,
305 struct ocfs2_xattr_value_root *xv,
306 u32 cpos, u32 phys_cpos, u32 len,
307 struct ocfs2_cached_dealloc_ctxt *dealloc)
308 {
309 int ret;
310 u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
311 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
312 struct inode *tl_inode = osb->osb_tl_inode;
313 handle_t *handle;
314 struct ocfs2_alloc_context *meta_ac = NULL;
315 struct ocfs2_extent_tree et;
316
317 ocfs2_init_xattr_value_extent_tree(&et, inode, root_bh, xv);
318
319 ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
320 if (ret) {
321 mlog_errno(ret);
322 return ret;
323 }
324
325 mutex_lock(&tl_inode->i_mutex);
326
327 if (ocfs2_truncate_log_needs_flush(osb)) {
328 ret = __ocfs2_flush_truncate_log(osb);
329 if (ret < 0) {
330 mlog_errno(ret);
331 goto out;
332 }
333 }
334
335 handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
336 if (IS_ERR(handle)) {
337 ret = PTR_ERR(handle);
338 mlog_errno(ret);
339 goto out;
340 }
341
342 ret = ocfs2_journal_access(handle, inode, root_bh,
343 OCFS2_JOURNAL_ACCESS_WRITE);
344 if (ret) {
345 mlog_errno(ret);
346 goto out_commit;
347 }
348
349 ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
350 dealloc);
351 if (ret) {
352 mlog_errno(ret);
353 goto out_commit;
354 }
355
356 le32_add_cpu(&xv->xr_clusters, -len);
357
358 ret = ocfs2_journal_dirty(handle, root_bh);
359 if (ret) {
360 mlog_errno(ret);
361 goto out_commit;
362 }
363
364 ret = ocfs2_truncate_log_append(osb, handle, phys_blkno, len);
365 if (ret)
366 mlog_errno(ret);
367
368 out_commit:
369 ocfs2_commit_trans(osb, handle);
370 out:
371 mutex_unlock(&tl_inode->i_mutex);
372
373 if (meta_ac)
374 ocfs2_free_alloc_context(meta_ac);
375
376 return ret;
377 }
378
379 static int ocfs2_xattr_shrink_size(struct inode *inode,
380 u32 old_clusters,
381 u32 new_clusters,
382 struct buffer_head *root_bh,
383 struct ocfs2_xattr_value_root *xv)
384 {
385 int ret = 0;
386 u32 trunc_len, cpos, phys_cpos, alloc_size;
387 u64 block;
388 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
389 struct ocfs2_cached_dealloc_ctxt dealloc;
390
391 ocfs2_init_dealloc_ctxt(&dealloc);
392
393 if (old_clusters <= new_clusters)
394 return 0;
395
396 cpos = new_clusters;
397 trunc_len = old_clusters - new_clusters;
398 while (trunc_len) {
399 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
400 &alloc_size, &xv->xr_list);
401 if (ret) {
402 mlog_errno(ret);
403 goto out;
404 }
405
406 if (alloc_size > trunc_len)
407 alloc_size = trunc_len;
408
409 ret = __ocfs2_remove_xattr_range(inode, root_bh, xv, cpos,
410 phys_cpos, alloc_size,
411 &dealloc);
412 if (ret) {
413 mlog_errno(ret);
414 goto out;
415 }
416
417 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
418 ocfs2_remove_xattr_clusters_from_cache(inode, block,
419 alloc_size);
420 cpos += alloc_size;
421 trunc_len -= alloc_size;
422 }
423
424 out:
425 ocfs2_schedule_truncate_log_flush(osb, 1);
426 ocfs2_run_deallocs(osb, &dealloc);
427
428 return ret;
429 }
430
431 static int ocfs2_xattr_value_truncate(struct inode *inode,
432 struct buffer_head *root_bh,
433 struct ocfs2_xattr_value_root *xv,
434 int len)
435 {
436 int ret;
437 u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
438 u32 old_clusters = le32_to_cpu(xv->xr_clusters);
439
440 if (new_clusters == old_clusters)
441 return 0;
442
443 if (new_clusters > old_clusters)
444 ret = ocfs2_xattr_extend_allocation(inode,
445 new_clusters - old_clusters,
446 root_bh, xv);
447 else
448 ret = ocfs2_xattr_shrink_size(inode,
449 old_clusters, new_clusters,
450 root_bh, xv);
451
452 return ret;
453 }
454
455 static int ocfs2_xattr_list_entry(char *buffer, size_t size,
456 size_t *result, const char *prefix,
457 const char *name, int name_len)
458 {
459 char *p = buffer + *result;
460 int prefix_len = strlen(prefix);
461 int total_len = prefix_len + name_len + 1;
462
463 *result += total_len;
464
465 /* we are just looking for how big our buffer needs to be */
466 if (!size)
467 return 0;
468
469 if (*result > size)
470 return -ERANGE;
471
472 memcpy(p, prefix, prefix_len);
473 memcpy(p + prefix_len, name, name_len);
474 p[prefix_len + name_len] = '\0';
475
476 return 0;
477 }
478
479 static int ocfs2_xattr_list_entries(struct inode *inode,
480 struct ocfs2_xattr_header *header,
481 char *buffer, size_t buffer_size)
482 {
483 size_t result = 0;
484 int i, type, ret;
485 const char *prefix, *name;
486
487 for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
488 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
489 type = ocfs2_xattr_get_type(entry);
490 prefix = ocfs2_xattr_prefix(type);
491
492 if (prefix) {
493 name = (const char *)header +
494 le16_to_cpu(entry->xe_name_offset);
495
496 ret = ocfs2_xattr_list_entry(buffer, buffer_size,
497 &result, prefix, name,
498 entry->xe_name_len);
499 if (ret)
500 return ret;
501 }
502 }
503
504 return result;
505 }
506
507 static int ocfs2_xattr_ibody_list(struct inode *inode,
508 struct ocfs2_dinode *di,
509 char *buffer,
510 size_t buffer_size)
511 {
512 struct ocfs2_xattr_header *header = NULL;
513 struct ocfs2_inode_info *oi = OCFS2_I(inode);
514 int ret = 0;
515
516 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
517 return ret;
518
519 header = (struct ocfs2_xattr_header *)
520 ((void *)di + inode->i_sb->s_blocksize -
521 le16_to_cpu(di->i_xattr_inline_size));
522
523 ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size);
524
525 return ret;
526 }
527
528 static int ocfs2_xattr_block_list(struct inode *inode,
529 struct ocfs2_dinode *di,
530 char *buffer,
531 size_t buffer_size)
532 {
533 struct buffer_head *blk_bh = NULL;
534 struct ocfs2_xattr_block *xb;
535 int ret = 0;
536
537 if (!di->i_xattr_loc)
538 return ret;
539
540 ret = ocfs2_read_block(inode, le64_to_cpu(di->i_xattr_loc), &blk_bh);
541 if (ret < 0) {
542 mlog_errno(ret);
543 return ret;
544 }
545 /*Verify the signature of xattr block*/
546 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
547 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
548 ret = -EFAULT;
549 goto cleanup;
550 }
551
552 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
553
554 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
555 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
556 ret = ocfs2_xattr_list_entries(inode, header,
557 buffer, buffer_size);
558 } else {
559 struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root;
560 ret = ocfs2_xattr_tree_list_index_block(inode, xt,
561 buffer, buffer_size);
562 }
563 cleanup:
564 brelse(blk_bh);
565
566 return ret;
567 }
568
569 ssize_t ocfs2_listxattr(struct dentry *dentry,
570 char *buffer,
571 size_t size)
572 {
573 int ret = 0, i_ret = 0, b_ret = 0;
574 struct buffer_head *di_bh = NULL;
575 struct ocfs2_dinode *di = NULL;
576 struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode);
577
578 if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
579 return -EOPNOTSUPP;
580
581 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
582 return ret;
583
584 ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0);
585 if (ret < 0) {
586 mlog_errno(ret);
587 return ret;
588 }
589
590 di = (struct ocfs2_dinode *)di_bh->b_data;
591
592 down_read(&oi->ip_xattr_sem);
593 i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size);
594 if (i_ret < 0)
595 b_ret = 0;
596 else {
597 if (buffer) {
598 buffer += i_ret;
599 size -= i_ret;
600 }
601 b_ret = ocfs2_xattr_block_list(dentry->d_inode, di,
602 buffer, size);
603 if (b_ret < 0)
604 i_ret = 0;
605 }
606 up_read(&oi->ip_xattr_sem);
607 ocfs2_inode_unlock(dentry->d_inode, 0);
608
609 brelse(di_bh);
610
611 return i_ret + b_ret;
612 }
613
614 static int ocfs2_xattr_find_entry(int name_index,
615 const char *name,
616 struct ocfs2_xattr_search *xs)
617 {
618 struct ocfs2_xattr_entry *entry;
619 size_t name_len;
620 int i, cmp = 1;
621
622 if (name == NULL)
623 return -EINVAL;
624
625 name_len = strlen(name);
626 entry = xs->here;
627 for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
628 cmp = name_index - ocfs2_xattr_get_type(entry);
629 if (!cmp)
630 cmp = name_len - entry->xe_name_len;
631 if (!cmp)
632 cmp = memcmp(name, (xs->base +
633 le16_to_cpu(entry->xe_name_offset)),
634 name_len);
635 if (cmp == 0)
636 break;
637 entry += 1;
638 }
639 xs->here = entry;
640
641 return cmp ? -ENODATA : 0;
642 }
643
644 static int ocfs2_xattr_get_value_outside(struct inode *inode,
645 struct ocfs2_xattr_value_root *xv,
646 void *buffer,
647 size_t len)
648 {
649 u32 cpos, p_cluster, num_clusters, bpc, clusters;
650 u64 blkno;
651 int i, ret = 0;
652 size_t cplen, blocksize;
653 struct buffer_head *bh = NULL;
654 struct ocfs2_extent_list *el;
655
656 el = &xv->xr_list;
657 clusters = le32_to_cpu(xv->xr_clusters);
658 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
659 blocksize = inode->i_sb->s_blocksize;
660
661 cpos = 0;
662 while (cpos < clusters) {
663 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
664 &num_clusters, el);
665 if (ret) {
666 mlog_errno(ret);
667 goto out;
668 }
669
670 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
671 /* Copy ocfs2_xattr_value */
672 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
673 ret = ocfs2_read_block(inode, blkno, &bh);
674 if (ret) {
675 mlog_errno(ret);
676 goto out;
677 }
678
679 cplen = len >= blocksize ? blocksize : len;
680 memcpy(buffer, bh->b_data, cplen);
681 len -= cplen;
682 buffer += cplen;
683
684 brelse(bh);
685 bh = NULL;
686 if (len == 0)
687 break;
688 }
689 cpos += num_clusters;
690 }
691 out:
692 return ret;
693 }
694
695 static int ocfs2_xattr_ibody_get(struct inode *inode,
696 int name_index,
697 const char *name,
698 void *buffer,
699 size_t buffer_size,
700 struct ocfs2_xattr_search *xs)
701 {
702 struct ocfs2_inode_info *oi = OCFS2_I(inode);
703 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
704 struct ocfs2_xattr_value_root *xv;
705 size_t size;
706 int ret = 0;
707
708 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
709 return -ENODATA;
710
711 xs->end = (void *)di + inode->i_sb->s_blocksize;
712 xs->header = (struct ocfs2_xattr_header *)
713 (xs->end - le16_to_cpu(di->i_xattr_inline_size));
714 xs->base = (void *)xs->header;
715 xs->here = xs->header->xh_entries;
716
717 ret = ocfs2_xattr_find_entry(name_index, name, xs);
718 if (ret)
719 return ret;
720 size = le64_to_cpu(xs->here->xe_value_size);
721 if (buffer) {
722 if (size > buffer_size)
723 return -ERANGE;
724 if (ocfs2_xattr_is_local(xs->here)) {
725 memcpy(buffer, (void *)xs->base +
726 le16_to_cpu(xs->here->xe_name_offset) +
727 OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
728 } else {
729 xv = (struct ocfs2_xattr_value_root *)
730 (xs->base + le16_to_cpu(
731 xs->here->xe_name_offset) +
732 OCFS2_XATTR_SIZE(xs->here->xe_name_len));
733 ret = ocfs2_xattr_get_value_outside(inode, xv,
734 buffer, size);
735 if (ret < 0) {
736 mlog_errno(ret);
737 return ret;
738 }
739 }
740 }
741
742 return size;
743 }
744
745 static int ocfs2_xattr_block_get(struct inode *inode,
746 int name_index,
747 const char *name,
748 void *buffer,
749 size_t buffer_size,
750 struct ocfs2_xattr_search *xs)
751 {
752 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
753 struct buffer_head *blk_bh = NULL;
754 struct ocfs2_xattr_block *xb;
755 struct ocfs2_xattr_value_root *xv;
756 size_t size;
757 int ret = -ENODATA, name_offset, name_len, block_off, i;
758
759 if (!di->i_xattr_loc)
760 return ret;
761
762 memset(&xs->bucket, 0, sizeof(xs->bucket));
763
764 ret = ocfs2_read_block(inode, le64_to_cpu(di->i_xattr_loc), &blk_bh);
765 if (ret < 0) {
766 mlog_errno(ret);
767 return ret;
768 }
769 /*Verify the signature of xattr block*/
770 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
771 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
772 ret = -EFAULT;
773 goto cleanup;
774 }
775
776 xs->xattr_bh = blk_bh;
777 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
778
779 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
780 xs->header = &xb->xb_attrs.xb_header;
781 xs->base = (void *)xs->header;
782 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
783 xs->here = xs->header->xh_entries;
784
785 ret = ocfs2_xattr_find_entry(name_index, name, xs);
786 } else
787 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
788 name_index,
789 name, xs);
790
791 if (ret)
792 goto cleanup;
793 size = le64_to_cpu(xs->here->xe_value_size);
794 if (buffer) {
795 ret = -ERANGE;
796 if (size > buffer_size)
797 goto cleanup;
798
799 name_offset = le16_to_cpu(xs->here->xe_name_offset);
800 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
801 i = xs->here - xs->header->xh_entries;
802
803 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
804 ret = ocfs2_xattr_bucket_get_name_value(inode,
805 xs->bucket.xh,
806 i,
807 &block_off,
808 &name_offset);
809 xs->base = xs->bucket.bhs[block_off]->b_data;
810 }
811 if (ocfs2_xattr_is_local(xs->here)) {
812 memcpy(buffer, (void *)xs->base +
813 name_offset + name_len, size);
814 } else {
815 xv = (struct ocfs2_xattr_value_root *)
816 (xs->base + name_offset + name_len);
817 ret = ocfs2_xattr_get_value_outside(inode, xv,
818 buffer, size);
819 if (ret < 0) {
820 mlog_errno(ret);
821 goto cleanup;
822 }
823 }
824 }
825 ret = size;
826 cleanup:
827 for (i = 0; i < OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET; i++)
828 brelse(xs->bucket.bhs[i]);
829 memset(&xs->bucket, 0, sizeof(xs->bucket));
830
831 brelse(blk_bh);
832 return ret;
833 }
834
835 /* ocfs2_xattr_get()
836 *
837 * Copy an extended attribute into the buffer provided.
838 * Buffer is NULL to compute the size of buffer required.
839 */
840 int ocfs2_xattr_get(struct inode *inode,
841 int name_index,
842 const char *name,
843 void *buffer,
844 size_t buffer_size)
845 {
846 int ret;
847 struct ocfs2_dinode *di = NULL;
848 struct buffer_head *di_bh = NULL;
849 struct ocfs2_inode_info *oi = OCFS2_I(inode);
850 struct ocfs2_xattr_search xis = {
851 .not_found = -ENODATA,
852 };
853 struct ocfs2_xattr_search xbs = {
854 .not_found = -ENODATA,
855 };
856
857 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
858 return -EOPNOTSUPP;
859
860 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
861 ret = -ENODATA;
862
863 ret = ocfs2_inode_lock(inode, &di_bh, 0);
864 if (ret < 0) {
865 mlog_errno(ret);
866 return ret;
867 }
868 xis.inode_bh = xbs.inode_bh = di_bh;
869 di = (struct ocfs2_dinode *)di_bh->b_data;
870
871 down_read(&oi->ip_xattr_sem);
872 ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
873 buffer_size, &xis);
874 if (ret == -ENODATA)
875 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
876 buffer_size, &xbs);
877 up_read(&oi->ip_xattr_sem);
878 ocfs2_inode_unlock(inode, 0);
879
880 brelse(di_bh);
881
882 return ret;
883 }
884
885 static int __ocfs2_xattr_set_value_outside(struct inode *inode,
886 struct ocfs2_xattr_value_root *xv,
887 const void *value,
888 int value_len)
889 {
890 int ret = 0, i, cp_len, credits;
891 u16 blocksize = inode->i_sb->s_blocksize;
892 u32 p_cluster, num_clusters;
893 u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
894 u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
895 u64 blkno;
896 struct buffer_head *bh = NULL;
897 handle_t *handle;
898
899 BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
900
901 credits = clusters * bpc;
902 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), credits);
903 if (IS_ERR(handle)) {
904 ret = PTR_ERR(handle);
905 mlog_errno(ret);
906 goto out;
907 }
908
909 while (cpos < clusters) {
910 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
911 &num_clusters, &xv->xr_list);
912 if (ret) {
913 mlog_errno(ret);
914 goto out_commit;
915 }
916
917 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
918
919 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
920 ret = ocfs2_read_block(inode, blkno, &bh);
921 if (ret) {
922 mlog_errno(ret);
923 goto out_commit;
924 }
925
926 ret = ocfs2_journal_access(handle,
927 inode,
928 bh,
929 OCFS2_JOURNAL_ACCESS_WRITE);
930 if (ret < 0) {
931 mlog_errno(ret);
932 goto out_commit;
933 }
934
935 cp_len = value_len > blocksize ? blocksize : value_len;
936 memcpy(bh->b_data, value, cp_len);
937 value_len -= cp_len;
938 value += cp_len;
939 if (cp_len < blocksize)
940 memset(bh->b_data + cp_len, 0,
941 blocksize - cp_len);
942
943 ret = ocfs2_journal_dirty(handle, bh);
944 if (ret < 0) {
945 mlog_errno(ret);
946 goto out_commit;
947 }
948 brelse(bh);
949 bh = NULL;
950
951 /*
952 * XXX: do we need to empty all the following
953 * blocks in this cluster?
954 */
955 if (!value_len)
956 break;
957 }
958 cpos += num_clusters;
959 }
960 out_commit:
961 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
962 out:
963 brelse(bh);
964
965 return ret;
966 }
967
968 static int ocfs2_xattr_cleanup(struct inode *inode,
969 struct ocfs2_xattr_info *xi,
970 struct ocfs2_xattr_search *xs,
971 size_t offs)
972 {
973 handle_t *handle = NULL;
974 int ret = 0;
975 size_t name_len = strlen(xi->name);
976 void *val = xs->base + offs;
977 size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
978
979 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
980 OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
981 if (IS_ERR(handle)) {
982 ret = PTR_ERR(handle);
983 mlog_errno(ret);
984 goto out;
985 }
986 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
987 OCFS2_JOURNAL_ACCESS_WRITE);
988 if (ret) {
989 mlog_errno(ret);
990 goto out_commit;
991 }
992 /* Decrease xattr count */
993 le16_add_cpu(&xs->header->xh_count, -1);
994 /* Remove the xattr entry and tree root which has already be set*/
995 memset((void *)xs->here, 0, sizeof(struct ocfs2_xattr_entry));
996 memset(val, 0, size);
997
998 ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
999 if (ret < 0)
1000 mlog_errno(ret);
1001 out_commit:
1002 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1003 out:
1004 return ret;
1005 }
1006
1007 static int ocfs2_xattr_update_entry(struct inode *inode,
1008 struct ocfs2_xattr_info *xi,
1009 struct ocfs2_xattr_search *xs,
1010 size_t offs)
1011 {
1012 handle_t *handle = NULL;
1013 int ret = 0;
1014
1015 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1016 OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
1017 if (IS_ERR(handle)) {
1018 ret = PTR_ERR(handle);
1019 mlog_errno(ret);
1020 goto out;
1021 }
1022 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1023 OCFS2_JOURNAL_ACCESS_WRITE);
1024 if (ret) {
1025 mlog_errno(ret);
1026 goto out_commit;
1027 }
1028
1029 xs->here->xe_name_offset = cpu_to_le16(offs);
1030 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1031 if (xi->value_len <= OCFS2_XATTR_INLINE_SIZE)
1032 ocfs2_xattr_set_local(xs->here, 1);
1033 else
1034 ocfs2_xattr_set_local(xs->here, 0);
1035 ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1036
1037 ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
1038 if (ret < 0)
1039 mlog_errno(ret);
1040 out_commit:
1041 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1042 out:
1043 return ret;
1044 }
1045
1046 /*
1047 * ocfs2_xattr_set_value_outside()
1048 *
1049 * Set large size value in B tree.
1050 */
1051 static int ocfs2_xattr_set_value_outside(struct inode *inode,
1052 struct ocfs2_xattr_info *xi,
1053 struct ocfs2_xattr_search *xs,
1054 size_t offs)
1055 {
1056 size_t name_len = strlen(xi->name);
1057 void *val = xs->base + offs;
1058 struct ocfs2_xattr_value_root *xv = NULL;
1059 size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1060 int ret = 0;
1061
1062 memset(val, 0, size);
1063 memcpy(val, xi->name, name_len);
1064 xv = (struct ocfs2_xattr_value_root *)
1065 (val + OCFS2_XATTR_SIZE(name_len));
1066 xv->xr_clusters = 0;
1067 xv->xr_last_eb_blk = 0;
1068 xv->xr_list.l_tree_depth = 0;
1069 xv->xr_list.l_count = cpu_to_le16(1);
1070 xv->xr_list.l_next_free_rec = 0;
1071
1072 ret = ocfs2_xattr_value_truncate(inode, xs->xattr_bh, xv,
1073 xi->value_len);
1074 if (ret < 0) {
1075 mlog_errno(ret);
1076 return ret;
1077 }
1078 ret = __ocfs2_xattr_set_value_outside(inode, xv, xi->value,
1079 xi->value_len);
1080 if (ret < 0) {
1081 mlog_errno(ret);
1082 return ret;
1083 }
1084 ret = ocfs2_xattr_update_entry(inode, xi, xs, offs);
1085 if (ret < 0)
1086 mlog_errno(ret);
1087
1088 return ret;
1089 }
1090
1091 /*
1092 * ocfs2_xattr_set_entry_local()
1093 *
1094 * Set, replace or remove extended attribute in local.
1095 */
1096 static void ocfs2_xattr_set_entry_local(struct inode *inode,
1097 struct ocfs2_xattr_info *xi,
1098 struct ocfs2_xattr_search *xs,
1099 struct ocfs2_xattr_entry *last,
1100 size_t min_offs)
1101 {
1102 size_t name_len = strlen(xi->name);
1103 int i;
1104
1105 if (xi->value && xs->not_found) {
1106 /* Insert the new xattr entry. */
1107 le16_add_cpu(&xs->header->xh_count, 1);
1108 ocfs2_xattr_set_type(last, xi->name_index);
1109 ocfs2_xattr_set_local(last, 1);
1110 last->xe_name_len = name_len;
1111 } else {
1112 void *first_val;
1113 void *val;
1114 size_t offs, size;
1115
1116 first_val = xs->base + min_offs;
1117 offs = le16_to_cpu(xs->here->xe_name_offset);
1118 val = xs->base + offs;
1119
1120 if (le64_to_cpu(xs->here->xe_value_size) >
1121 OCFS2_XATTR_INLINE_SIZE)
1122 size = OCFS2_XATTR_SIZE(name_len) +
1123 OCFS2_XATTR_ROOT_SIZE;
1124 else
1125 size = OCFS2_XATTR_SIZE(name_len) +
1126 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1127
1128 if (xi->value && size == OCFS2_XATTR_SIZE(name_len) +
1129 OCFS2_XATTR_SIZE(xi->value_len)) {
1130 /* The old and the new value have the
1131 same size. Just replace the value. */
1132 ocfs2_xattr_set_local(xs->here, 1);
1133 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1134 /* Clear value bytes. */
1135 memset(val + OCFS2_XATTR_SIZE(name_len),
1136 0,
1137 OCFS2_XATTR_SIZE(xi->value_len));
1138 memcpy(val + OCFS2_XATTR_SIZE(name_len),
1139 xi->value,
1140 xi->value_len);
1141 return;
1142 }
1143 /* Remove the old name+value. */
1144 memmove(first_val + size, first_val, val - first_val);
1145 memset(first_val, 0, size);
1146 xs->here->xe_name_hash = 0;
1147 xs->here->xe_name_offset = 0;
1148 ocfs2_xattr_set_local(xs->here, 1);
1149 xs->here->xe_value_size = 0;
1150
1151 min_offs += size;
1152
1153 /* Adjust all value offsets. */
1154 last = xs->header->xh_entries;
1155 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1156 size_t o = le16_to_cpu(last->xe_name_offset);
1157
1158 if (o < offs)
1159 last->xe_name_offset = cpu_to_le16(o + size);
1160 last += 1;
1161 }
1162
1163 if (!xi->value) {
1164 /* Remove the old entry. */
1165 last -= 1;
1166 memmove(xs->here, xs->here + 1,
1167 (void *)last - (void *)xs->here);
1168 memset(last, 0, sizeof(struct ocfs2_xattr_entry));
1169 le16_add_cpu(&xs->header->xh_count, -1);
1170 }
1171 }
1172 if (xi->value) {
1173 /* Insert the new name+value. */
1174 size_t size = OCFS2_XATTR_SIZE(name_len) +
1175 OCFS2_XATTR_SIZE(xi->value_len);
1176 void *val = xs->base + min_offs - size;
1177
1178 xs->here->xe_name_offset = cpu_to_le16(min_offs - size);
1179 memset(val, 0, size);
1180 memcpy(val, xi->name, name_len);
1181 memcpy(val + OCFS2_XATTR_SIZE(name_len),
1182 xi->value,
1183 xi->value_len);
1184 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1185 ocfs2_xattr_set_local(xs->here, 1);
1186 ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1187 }
1188
1189 return;
1190 }
1191
1192 /*
1193 * ocfs2_xattr_set_entry()
1194 *
1195 * Set extended attribute entry into inode or block.
1196 *
1197 * If extended attribute value size > OCFS2_XATTR_INLINE_SIZE,
1198 * We first insert tree root(ocfs2_xattr_value_root) with set_entry_local(),
1199 * then set value in B tree with set_value_outside().
1200 */
1201 static int ocfs2_xattr_set_entry(struct inode *inode,
1202 struct ocfs2_xattr_info *xi,
1203 struct ocfs2_xattr_search *xs,
1204 int flag)
1205 {
1206 struct ocfs2_xattr_entry *last;
1207 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1208 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1209 size_t min_offs = xs->end - xs->base, name_len = strlen(xi->name);
1210 size_t size_l = 0;
1211 handle_t *handle = NULL;
1212 int free, i, ret;
1213 struct ocfs2_xattr_info xi_l = {
1214 .name_index = xi->name_index,
1215 .name = xi->name,
1216 .value = xi->value,
1217 .value_len = xi->value_len,
1218 };
1219
1220 /* Compute min_offs, last and free space. */
1221 last = xs->header->xh_entries;
1222
1223 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1224 size_t offs = le16_to_cpu(last->xe_name_offset);
1225 if (offs < min_offs)
1226 min_offs = offs;
1227 last += 1;
1228 }
1229
1230 free = min_offs - ((void *)last - xs->base) - sizeof(__u32);
1231 if (free < 0)
1232 return -EFAULT;
1233
1234 if (!xs->not_found) {
1235 size_t size = 0;
1236 if (ocfs2_xattr_is_local(xs->here))
1237 size = OCFS2_XATTR_SIZE(name_len) +
1238 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1239 else
1240 size = OCFS2_XATTR_SIZE(name_len) +
1241 OCFS2_XATTR_ROOT_SIZE;
1242 free += (size + sizeof(struct ocfs2_xattr_entry));
1243 }
1244 /* Check free space in inode or block */
1245 if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1246 if (free < sizeof(struct ocfs2_xattr_entry) +
1247 OCFS2_XATTR_SIZE(name_len) +
1248 OCFS2_XATTR_ROOT_SIZE) {
1249 ret = -ENOSPC;
1250 goto out;
1251 }
1252 size_l = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1253 xi_l.value = (void *)&def_xv;
1254 xi_l.value_len = OCFS2_XATTR_ROOT_SIZE;
1255 } else if (xi->value) {
1256 if (free < sizeof(struct ocfs2_xattr_entry) +
1257 OCFS2_XATTR_SIZE(name_len) +
1258 OCFS2_XATTR_SIZE(xi->value_len)) {
1259 ret = -ENOSPC;
1260 goto out;
1261 }
1262 }
1263
1264 if (!xs->not_found) {
1265 /* For existing extended attribute */
1266 size_t size = OCFS2_XATTR_SIZE(name_len) +
1267 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1268 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1269 void *val = xs->base + offs;
1270
1271 if (ocfs2_xattr_is_local(xs->here) && size == size_l) {
1272 /* Replace existing local xattr with tree root */
1273 ret = ocfs2_xattr_set_value_outside(inode, xi, xs,
1274 offs);
1275 if (ret < 0)
1276 mlog_errno(ret);
1277 goto out;
1278 } else if (!ocfs2_xattr_is_local(xs->here)) {
1279 /* For existing xattr which has value outside */
1280 struct ocfs2_xattr_value_root *xv = NULL;
1281 xv = (struct ocfs2_xattr_value_root *)(val +
1282 OCFS2_XATTR_SIZE(name_len));
1283
1284 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1285 /*
1286 * If new value need set outside also,
1287 * first truncate old value to new value,
1288 * then set new value with set_value_outside().
1289 */
1290 ret = ocfs2_xattr_value_truncate(inode,
1291 xs->xattr_bh,
1292 xv,
1293 xi->value_len);
1294 if (ret < 0) {
1295 mlog_errno(ret);
1296 goto out;
1297 }
1298
1299 ret = __ocfs2_xattr_set_value_outside(inode,
1300 xv,
1301 xi->value,
1302 xi->value_len);
1303 if (ret < 0) {
1304 mlog_errno(ret);
1305 goto out;
1306 }
1307
1308 ret = ocfs2_xattr_update_entry(inode,
1309 xi,
1310 xs,
1311 offs);
1312 if (ret < 0)
1313 mlog_errno(ret);
1314 goto out;
1315 } else {
1316 /*
1317 * If new value need set in local,
1318 * just trucate old value to zero.
1319 */
1320 ret = ocfs2_xattr_value_truncate(inode,
1321 xs->xattr_bh,
1322 xv,
1323 0);
1324 if (ret < 0)
1325 mlog_errno(ret);
1326 }
1327 }
1328 }
1329
1330 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1331 OCFS2_INODE_UPDATE_CREDITS);
1332 if (IS_ERR(handle)) {
1333 ret = PTR_ERR(handle);
1334 mlog_errno(ret);
1335 goto out;
1336 }
1337
1338 ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
1339 OCFS2_JOURNAL_ACCESS_WRITE);
1340 if (ret) {
1341 mlog_errno(ret);
1342 goto out_commit;
1343 }
1344
1345 if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1346 /* set extended attribute in external block. */
1347 ret = ocfs2_extend_trans(handle,
1348 OCFS2_INODE_UPDATE_CREDITS +
1349 OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
1350 if (ret) {
1351 mlog_errno(ret);
1352 goto out_commit;
1353 }
1354 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1355 OCFS2_JOURNAL_ACCESS_WRITE);
1356 if (ret) {
1357 mlog_errno(ret);
1358 goto out_commit;
1359 }
1360 }
1361
1362 /*
1363 * Set value in local, include set tree root in local.
1364 * This is the first step for value size >INLINE_SIZE.
1365 */
1366 ocfs2_xattr_set_entry_local(inode, &xi_l, xs, last, min_offs);
1367
1368 if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1369 ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
1370 if (ret < 0) {
1371 mlog_errno(ret);
1372 goto out_commit;
1373 }
1374 }
1375
1376 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) &&
1377 (flag & OCFS2_INLINE_XATTR_FL)) {
1378 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1379 unsigned int xattrsize = osb->s_xattr_inline_size;
1380
1381 /*
1382 * Adjust extent record count or inline data size
1383 * to reserve space for extended attribute.
1384 */
1385 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1386 struct ocfs2_inline_data *idata = &di->id2.i_data;
1387 le16_add_cpu(&idata->id_count, -xattrsize);
1388 } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
1389 struct ocfs2_extent_list *el = &di->id2.i_list;
1390 le16_add_cpu(&el->l_count, -(xattrsize /
1391 sizeof(struct ocfs2_extent_rec)));
1392 }
1393 di->i_xattr_inline_size = cpu_to_le16(xattrsize);
1394 }
1395 /* Update xattr flag */
1396 spin_lock(&oi->ip_lock);
1397 oi->ip_dyn_features |= flag;
1398 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1399 spin_unlock(&oi->ip_lock);
1400 /* Update inode ctime */
1401 inode->i_ctime = CURRENT_TIME;
1402 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
1403 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
1404
1405 ret = ocfs2_journal_dirty(handle, xs->inode_bh);
1406 if (ret < 0)
1407 mlog_errno(ret);
1408
1409 out_commit:
1410 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1411
1412 if (!ret && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1413 /*
1414 * Set value outside in B tree.
1415 * This is the second step for value size > INLINE_SIZE.
1416 */
1417 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1418 ret = ocfs2_xattr_set_value_outside(inode, xi, xs, offs);
1419 if (ret < 0) {
1420 int ret2;
1421
1422 mlog_errno(ret);
1423 /*
1424 * If set value outside failed, we have to clean
1425 * the junk tree root we have already set in local.
1426 */
1427 ret2 = ocfs2_xattr_cleanup(inode, xi, xs, offs);
1428 if (ret2 < 0)
1429 mlog_errno(ret2);
1430 }
1431 }
1432 out:
1433 return ret;
1434
1435 }
1436
1437 static int ocfs2_remove_value_outside(struct inode*inode,
1438 struct buffer_head *bh,
1439 struct ocfs2_xattr_header *header)
1440 {
1441 int ret = 0, i;
1442
1443 for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
1444 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
1445
1446 if (!ocfs2_xattr_is_local(entry)) {
1447 struct ocfs2_xattr_value_root *xv;
1448 void *val;
1449
1450 val = (void *)header +
1451 le16_to_cpu(entry->xe_name_offset);
1452 xv = (struct ocfs2_xattr_value_root *)
1453 (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
1454 ret = ocfs2_xattr_value_truncate(inode, bh, xv, 0);
1455 if (ret < 0) {
1456 mlog_errno(ret);
1457 return ret;
1458 }
1459 }
1460 }
1461
1462 return ret;
1463 }
1464
1465 static int ocfs2_xattr_ibody_remove(struct inode *inode,
1466 struct buffer_head *di_bh)
1467 {
1468
1469 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1470 struct ocfs2_xattr_header *header;
1471 int ret;
1472
1473 header = (struct ocfs2_xattr_header *)
1474 ((void *)di + inode->i_sb->s_blocksize -
1475 le16_to_cpu(di->i_xattr_inline_size));
1476
1477 ret = ocfs2_remove_value_outside(inode, di_bh, header);
1478
1479 return ret;
1480 }
1481
1482 static int ocfs2_xattr_block_remove(struct inode *inode,
1483 struct buffer_head *blk_bh)
1484 {
1485 struct ocfs2_xattr_block *xb;
1486 int ret = 0;
1487
1488 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1489 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
1490 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
1491 ret = ocfs2_remove_value_outside(inode, blk_bh, header);
1492 } else
1493 ret = ocfs2_delete_xattr_index_block(inode, blk_bh);
1494
1495 return ret;
1496 }
1497
1498 static int ocfs2_xattr_free_block(struct inode *inode,
1499 u64 block)
1500 {
1501 struct inode *xb_alloc_inode;
1502 struct buffer_head *xb_alloc_bh = NULL;
1503 struct buffer_head *blk_bh = NULL;
1504 struct ocfs2_xattr_block *xb;
1505 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1506 handle_t *handle;
1507 int ret = 0;
1508 u64 blk, bg_blkno;
1509 u16 bit;
1510
1511 ret = ocfs2_read_block(inode, block, &blk_bh);
1512 if (ret < 0) {
1513 mlog_errno(ret);
1514 goto out;
1515 }
1516
1517 /*Verify the signature of xattr block*/
1518 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
1519 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
1520 ret = -EFAULT;
1521 goto out;
1522 }
1523
1524 ret = ocfs2_xattr_block_remove(inode, blk_bh);
1525 if (ret < 0) {
1526 mlog_errno(ret);
1527 goto out;
1528 }
1529
1530 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1531 blk = le64_to_cpu(xb->xb_blkno);
1532 bit = le16_to_cpu(xb->xb_suballoc_bit);
1533 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
1534
1535 xb_alloc_inode = ocfs2_get_system_file_inode(osb,
1536 EXTENT_ALLOC_SYSTEM_INODE,
1537 le16_to_cpu(xb->xb_suballoc_slot));
1538 if (!xb_alloc_inode) {
1539 ret = -ENOMEM;
1540 mlog_errno(ret);
1541 goto out;
1542 }
1543 mutex_lock(&xb_alloc_inode->i_mutex);
1544
1545 ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
1546 if (ret < 0) {
1547 mlog_errno(ret);
1548 goto out_mutex;
1549 }
1550
1551 handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
1552 if (IS_ERR(handle)) {
1553 ret = PTR_ERR(handle);
1554 mlog_errno(ret);
1555 goto out_unlock;
1556 }
1557
1558 ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
1559 bit, bg_blkno, 1);
1560 if (ret < 0)
1561 mlog_errno(ret);
1562
1563 ocfs2_commit_trans(osb, handle);
1564 out_unlock:
1565 ocfs2_inode_unlock(xb_alloc_inode, 1);
1566 brelse(xb_alloc_bh);
1567 out_mutex:
1568 mutex_unlock(&xb_alloc_inode->i_mutex);
1569 iput(xb_alloc_inode);
1570 out:
1571 brelse(blk_bh);
1572 return ret;
1573 }
1574
1575 /*
1576 * ocfs2_xattr_remove()
1577 *
1578 * Free extended attribute resources associated with this inode.
1579 */
1580 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
1581 {
1582 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1583 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1584 handle_t *handle;
1585 int ret;
1586
1587 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1588 return 0;
1589
1590 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1591 return 0;
1592
1593 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
1594 ret = ocfs2_xattr_ibody_remove(inode, di_bh);
1595 if (ret < 0) {
1596 mlog_errno(ret);
1597 goto out;
1598 }
1599 }
1600
1601 if (di->i_xattr_loc) {
1602 ret = ocfs2_xattr_free_block(inode,
1603 le64_to_cpu(di->i_xattr_loc));
1604 if (ret < 0) {
1605 mlog_errno(ret);
1606 goto out;
1607 }
1608 }
1609
1610 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1611 OCFS2_INODE_UPDATE_CREDITS);
1612 if (IS_ERR(handle)) {
1613 ret = PTR_ERR(handle);
1614 mlog_errno(ret);
1615 goto out;
1616 }
1617 ret = ocfs2_journal_access(handle, inode, di_bh,
1618 OCFS2_JOURNAL_ACCESS_WRITE);
1619 if (ret) {
1620 mlog_errno(ret);
1621 goto out_commit;
1622 }
1623
1624 di->i_xattr_loc = 0;
1625
1626 spin_lock(&oi->ip_lock);
1627 oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
1628 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1629 spin_unlock(&oi->ip_lock);
1630
1631 ret = ocfs2_journal_dirty(handle, di_bh);
1632 if (ret < 0)
1633 mlog_errno(ret);
1634 out_commit:
1635 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1636 out:
1637 return ret;
1638 }
1639
1640 static int ocfs2_xattr_has_space_inline(struct inode *inode,
1641 struct ocfs2_dinode *di)
1642 {
1643 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1644 unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
1645 int free;
1646
1647 if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
1648 return 0;
1649
1650 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1651 struct ocfs2_inline_data *idata = &di->id2.i_data;
1652 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
1653 } else if (ocfs2_inode_is_fast_symlink(inode)) {
1654 free = ocfs2_fast_symlink_chars(inode->i_sb) -
1655 le64_to_cpu(di->i_size);
1656 } else {
1657 struct ocfs2_extent_list *el = &di->id2.i_list;
1658 free = (le16_to_cpu(el->l_count) -
1659 le16_to_cpu(el->l_next_free_rec)) *
1660 sizeof(struct ocfs2_extent_rec);
1661 }
1662 if (free >= xattrsize)
1663 return 1;
1664
1665 return 0;
1666 }
1667
1668 /*
1669 * ocfs2_xattr_ibody_find()
1670 *
1671 * Find extended attribute in inode block and
1672 * fill search info into struct ocfs2_xattr_search.
1673 */
1674 static int ocfs2_xattr_ibody_find(struct inode *inode,
1675 int name_index,
1676 const char *name,
1677 struct ocfs2_xattr_search *xs)
1678 {
1679 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1680 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1681 int ret;
1682 int has_space = 0;
1683
1684 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
1685 return 0;
1686
1687 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
1688 down_read(&oi->ip_alloc_sem);
1689 has_space = ocfs2_xattr_has_space_inline(inode, di);
1690 up_read(&oi->ip_alloc_sem);
1691 if (!has_space)
1692 return 0;
1693 }
1694
1695 xs->xattr_bh = xs->inode_bh;
1696 xs->end = (void *)di + inode->i_sb->s_blocksize;
1697 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
1698 xs->header = (struct ocfs2_xattr_header *)
1699 (xs->end - le16_to_cpu(di->i_xattr_inline_size));
1700 else
1701 xs->header = (struct ocfs2_xattr_header *)
1702 (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
1703 xs->base = (void *)xs->header;
1704 xs->here = xs->header->xh_entries;
1705
1706 /* Find the named attribute. */
1707 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
1708 ret = ocfs2_xattr_find_entry(name_index, name, xs);
1709 if (ret && ret != -ENODATA)
1710 return ret;
1711 xs->not_found = ret;
1712 }
1713
1714 return 0;
1715 }
1716
1717 /*
1718 * ocfs2_xattr_ibody_set()
1719 *
1720 * Set, replace or remove an extended attribute into inode block.
1721 *
1722 */
1723 static int ocfs2_xattr_ibody_set(struct inode *inode,
1724 struct ocfs2_xattr_info *xi,
1725 struct ocfs2_xattr_search *xs)
1726 {
1727 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1728 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1729 int ret;
1730
1731 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
1732 return -ENOSPC;
1733
1734 down_write(&oi->ip_alloc_sem);
1735 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
1736 if (!ocfs2_xattr_has_space_inline(inode, di)) {
1737 ret = -ENOSPC;
1738 goto out;
1739 }
1740 }
1741
1742 ret = ocfs2_xattr_set_entry(inode, xi, xs,
1743 (OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL));
1744 out:
1745 up_write(&oi->ip_alloc_sem);
1746
1747 return ret;
1748 }
1749
1750 /*
1751 * ocfs2_xattr_block_find()
1752 *
1753 * Find extended attribute in external block and
1754 * fill search info into struct ocfs2_xattr_search.
1755 */
1756 static int ocfs2_xattr_block_find(struct inode *inode,
1757 int name_index,
1758 const char *name,
1759 struct ocfs2_xattr_search *xs)
1760 {
1761 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1762 struct buffer_head *blk_bh = NULL;
1763 struct ocfs2_xattr_block *xb;
1764 int ret = 0;
1765
1766 if (!di->i_xattr_loc)
1767 return ret;
1768
1769 ret = ocfs2_read_block(inode, le64_to_cpu(di->i_xattr_loc), &blk_bh);
1770 if (ret < 0) {
1771 mlog_errno(ret);
1772 return ret;
1773 }
1774 /*Verify the signature of xattr block*/
1775 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
1776 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
1777 ret = -EFAULT;
1778 goto cleanup;
1779 }
1780
1781 xs->xattr_bh = blk_bh;
1782 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1783
1784 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
1785 xs->header = &xb->xb_attrs.xb_header;
1786 xs->base = (void *)xs->header;
1787 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
1788 xs->here = xs->header->xh_entries;
1789
1790 ret = ocfs2_xattr_find_entry(name_index, name, xs);
1791 } else
1792 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
1793 name_index,
1794 name, xs);
1795
1796 if (ret && ret != -ENODATA) {
1797 xs->xattr_bh = NULL;
1798 goto cleanup;
1799 }
1800 xs->not_found = ret;
1801 return 0;
1802 cleanup:
1803 brelse(blk_bh);
1804
1805 return ret;
1806 }
1807
1808 /*
1809 * When all the xattrs are deleted from index btree, the ocfs2_xattr_tree
1810 * will be erased and ocfs2_xattr_block will have its ocfs2_xattr_header
1811 * re-initialized.
1812 */
1813 static int ocfs2_restore_xattr_block(struct inode *inode,
1814 struct ocfs2_xattr_search *xs)
1815 {
1816 int ret;
1817 handle_t *handle;
1818 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1819 struct ocfs2_xattr_block *xb =
1820 (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1821 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
1822 u16 xb_flags = le16_to_cpu(xb->xb_flags);
1823
1824 BUG_ON(!(xb_flags & OCFS2_XATTR_INDEXED) ||
1825 le16_to_cpu(el->l_next_free_rec) != 0);
1826
1827 handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
1828 if (IS_ERR(handle)) {
1829 ret = PTR_ERR(handle);
1830 handle = NULL;
1831 goto out;
1832 }
1833
1834 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1835 OCFS2_JOURNAL_ACCESS_WRITE);
1836 if (ret < 0) {
1837 mlog_errno(ret);
1838 goto out_commit;
1839 }
1840
1841 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
1842 offsetof(struct ocfs2_xattr_block, xb_attrs));
1843
1844 xb->xb_flags = cpu_to_le16(xb_flags & ~OCFS2_XATTR_INDEXED);
1845
1846 ocfs2_journal_dirty(handle, xs->xattr_bh);
1847
1848 out_commit:
1849 ocfs2_commit_trans(osb, handle);
1850 out:
1851 return ret;
1852 }
1853
1854 /*
1855 * ocfs2_xattr_block_set()
1856 *
1857 * Set, replace or remove an extended attribute into external block.
1858 *
1859 */
1860 static int ocfs2_xattr_block_set(struct inode *inode,
1861 struct ocfs2_xattr_info *xi,
1862 struct ocfs2_xattr_search *xs)
1863 {
1864 struct buffer_head *new_bh = NULL;
1865 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1866 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1867 struct ocfs2_alloc_context *meta_ac = NULL;
1868 handle_t *handle = NULL;
1869 struct ocfs2_xattr_block *xblk = NULL;
1870 u16 suballoc_bit_start;
1871 u32 num_got;
1872 u64 first_blkno;
1873 int ret;
1874
1875 if (!xs->xattr_bh) {
1876 /*
1877 * Alloc one external block for extended attribute
1878 * outside of inode.
1879 */
1880 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
1881 if (ret < 0) {
1882 mlog_errno(ret);
1883 goto out;
1884 }
1885 handle = ocfs2_start_trans(osb,
1886 OCFS2_XATTR_BLOCK_CREATE_CREDITS);
1887 if (IS_ERR(handle)) {
1888 ret = PTR_ERR(handle);
1889 mlog_errno(ret);
1890 goto out;
1891 }
1892 ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
1893 OCFS2_JOURNAL_ACCESS_CREATE);
1894 if (ret < 0) {
1895 mlog_errno(ret);
1896 goto out_commit;
1897 }
1898
1899 ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1,
1900 &suballoc_bit_start, &num_got,
1901 &first_blkno);
1902 if (ret < 0) {
1903 mlog_errno(ret);
1904 goto out_commit;
1905 }
1906
1907 new_bh = sb_getblk(inode->i_sb, first_blkno);
1908 ocfs2_set_new_buffer_uptodate(inode, new_bh);
1909
1910 ret = ocfs2_journal_access(handle, inode, new_bh,
1911 OCFS2_JOURNAL_ACCESS_CREATE);
1912 if (ret < 0) {
1913 mlog_errno(ret);
1914 goto out_commit;
1915 }
1916
1917 /* Initialize ocfs2_xattr_block */
1918 xs->xattr_bh = new_bh;
1919 xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
1920 memset(xblk, 0, inode->i_sb->s_blocksize);
1921 strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
1922 xblk->xb_suballoc_slot = cpu_to_le16(osb->slot_num);
1923 xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
1924 xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation);
1925 xblk->xb_blkno = cpu_to_le64(first_blkno);
1926
1927 xs->header = &xblk->xb_attrs.xb_header;
1928 xs->base = (void *)xs->header;
1929 xs->end = (void *)xblk + inode->i_sb->s_blocksize;
1930 xs->here = xs->header->xh_entries;
1931
1932
1933 ret = ocfs2_journal_dirty(handle, new_bh);
1934 if (ret < 0) {
1935 mlog_errno(ret);
1936 goto out_commit;
1937 }
1938 di->i_xattr_loc = cpu_to_le64(first_blkno);
1939 ret = ocfs2_journal_dirty(handle, xs->inode_bh);
1940 if (ret < 0)
1941 mlog_errno(ret);
1942 out_commit:
1943 ocfs2_commit_trans(osb, handle);
1944 out:
1945 if (meta_ac)
1946 ocfs2_free_alloc_context(meta_ac);
1947 if (ret < 0)
1948 return ret;
1949 } else
1950 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1951
1952 if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
1953 /* Set extended attribute into external block */
1954 ret = ocfs2_xattr_set_entry(inode, xi, xs, OCFS2_HAS_XATTR_FL);
1955 if (!ret || ret != -ENOSPC)
1956 goto end;
1957
1958 ret = ocfs2_xattr_create_index_block(inode, xs);
1959 if (ret)
1960 goto end;
1961 }
1962
1963 ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs);
1964 if (!ret && xblk->xb_attrs.xb_root.xt_list.l_next_free_rec == 0)
1965 ret = ocfs2_restore_xattr_block(inode, xs);
1966
1967 end:
1968
1969 return ret;
1970 }
1971
1972 /*
1973 * ocfs2_xattr_set()
1974 *
1975 * Set, replace or remove an extended attribute for this inode.
1976 * value is NULL to remove an existing extended attribute, else either
1977 * create or replace an extended attribute.
1978 */
1979 int ocfs2_xattr_set(struct inode *inode,
1980 int name_index,
1981 const char *name,
1982 const void *value,
1983 size_t value_len,
1984 int flags)
1985 {
1986 struct buffer_head *di_bh = NULL;
1987 struct ocfs2_dinode *di;
1988 int ret;
1989 u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
1990
1991 struct ocfs2_xattr_info xi = {
1992 .name_index = name_index,
1993 .name = name,
1994 .value = value,
1995 .value_len = value_len,
1996 };
1997
1998 struct ocfs2_xattr_search xis = {
1999 .not_found = -ENODATA,
2000 };
2001
2002 struct ocfs2_xattr_search xbs = {
2003 .not_found = -ENODATA,
2004 };
2005
2006 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2007 return -EOPNOTSUPP;
2008
2009 ret = ocfs2_inode_lock(inode, &di_bh, 1);
2010 if (ret < 0) {
2011 mlog_errno(ret);
2012 return ret;
2013 }
2014 xis.inode_bh = xbs.inode_bh = di_bh;
2015 di = (struct ocfs2_dinode *)di_bh->b_data;
2016
2017 down_write(&OCFS2_I(inode)->ip_xattr_sem);
2018 /*
2019 * Scan inode and external block to find the same name
2020 * extended attribute and collect search infomation.
2021 */
2022 ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
2023 if (ret)
2024 goto cleanup;
2025 if (xis.not_found) {
2026 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
2027 if (ret)
2028 goto cleanup;
2029 }
2030
2031 if (xis.not_found && xbs.not_found) {
2032 ret = -ENODATA;
2033 if (flags & XATTR_REPLACE)
2034 goto cleanup;
2035 ret = 0;
2036 if (!value)
2037 goto cleanup;
2038 } else {
2039 ret = -EEXIST;
2040 if (flags & XATTR_CREATE)
2041 goto cleanup;
2042 }
2043
2044 if (!value) {
2045 /* Remove existing extended attribute */
2046 if (!xis.not_found)
2047 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
2048 else if (!xbs.not_found)
2049 ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
2050 } else {
2051 /* We always try to set extended attribute into inode first*/
2052 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
2053 if (!ret && !xbs.not_found) {
2054 /*
2055 * If succeed and that extended attribute existing in
2056 * external block, then we will remove it.
2057 */
2058 xi.value = NULL;
2059 xi.value_len = 0;
2060 ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
2061 } else if (ret == -ENOSPC) {
2062 if (di->i_xattr_loc && !xbs.xattr_bh) {
2063 ret = ocfs2_xattr_block_find(inode, name_index,
2064 name, &xbs);
2065 if (ret)
2066 goto cleanup;
2067 }
2068 /*
2069 * If no space in inode, we will set extended attribute
2070 * into external block.
2071 */
2072 ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
2073 if (ret)
2074 goto cleanup;
2075 if (!xis.not_found) {
2076 /*
2077 * If succeed and that extended attribute
2078 * existing in inode, we will remove it.
2079 */
2080 xi.value = NULL;
2081 xi.value_len = 0;
2082 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
2083 }
2084 }
2085 }
2086 cleanup:
2087 up_write(&OCFS2_I(inode)->ip_xattr_sem);
2088 ocfs2_inode_unlock(inode, 1);
2089 brelse(di_bh);
2090 brelse(xbs.xattr_bh);
2091 for (i = 0; i < blk_per_bucket; i++)
2092 brelse(xbs.bucket.bhs[i]);
2093
2094 return ret;
2095 }
2096
2097 /*
2098 * Find the xattr extent rec which may contains name_hash.
2099 * e_cpos will be the first name hash of the xattr rec.
2100 * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
2101 */
2102 static int ocfs2_xattr_get_rec(struct inode *inode,
2103 u32 name_hash,
2104 u64 *p_blkno,
2105 u32 *e_cpos,
2106 u32 *num_clusters,
2107 struct ocfs2_extent_list *el)
2108 {
2109 int ret = 0, i;
2110 struct buffer_head *eb_bh = NULL;
2111 struct ocfs2_extent_block *eb;
2112 struct ocfs2_extent_rec *rec = NULL;
2113 u64 e_blkno = 0;
2114
2115 if (el->l_tree_depth) {
2116 ret = ocfs2_find_leaf(inode, el, name_hash, &eb_bh);
2117 if (ret) {
2118 mlog_errno(ret);
2119 goto out;
2120 }
2121
2122 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2123 el = &eb->h_list;
2124
2125 if (el->l_tree_depth) {
2126 ocfs2_error(inode->i_sb,
2127 "Inode %lu has non zero tree depth in "
2128 "xattr tree block %llu\n", inode->i_ino,
2129 (unsigned long long)eb_bh->b_blocknr);
2130 ret = -EROFS;
2131 goto out;
2132 }
2133 }
2134
2135 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
2136 rec = &el->l_recs[i];
2137
2138 if (le32_to_cpu(rec->e_cpos) <= name_hash) {
2139 e_blkno = le64_to_cpu(rec->e_blkno);
2140 break;
2141 }
2142 }
2143
2144 if (!e_blkno) {
2145 ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
2146 "record (%u, %u, 0) in xattr", inode->i_ino,
2147 le32_to_cpu(rec->e_cpos),
2148 ocfs2_rec_clusters(el, rec));
2149 ret = -EROFS;
2150 goto out;
2151 }
2152
2153 *p_blkno = le64_to_cpu(rec->e_blkno);
2154 *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
2155 if (e_cpos)
2156 *e_cpos = le32_to_cpu(rec->e_cpos);
2157 out:
2158 brelse(eb_bh);
2159 return ret;
2160 }
2161
2162 typedef int (xattr_bucket_func)(struct inode *inode,
2163 struct ocfs2_xattr_bucket *bucket,
2164 void *para);
2165
2166 static int ocfs2_find_xe_in_bucket(struct inode *inode,
2167 struct buffer_head *header_bh,
2168 int name_index,
2169 const char *name,
2170 u32 name_hash,
2171 u16 *xe_index,
2172 int *found)
2173 {
2174 int i, ret = 0, cmp = 1, block_off, new_offset;
2175 struct ocfs2_xattr_header *xh =
2176 (struct ocfs2_xattr_header *)header_bh->b_data;
2177 size_t name_len = strlen(name);
2178 struct ocfs2_xattr_entry *xe = NULL;
2179 struct buffer_head *name_bh = NULL;
2180 char *xe_name;
2181
2182 /*
2183 * We don't use binary search in the bucket because there
2184 * may be multiple entries with the same name hash.
2185 */
2186 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
2187 xe = &xh->xh_entries[i];
2188
2189 if (name_hash > le32_to_cpu(xe->xe_name_hash))
2190 continue;
2191 else if (name_hash < le32_to_cpu(xe->xe_name_hash))
2192 break;
2193
2194 cmp = name_index - ocfs2_xattr_get_type(xe);
2195 if (!cmp)
2196 cmp = name_len - xe->xe_name_len;
2197 if (cmp)
2198 continue;
2199
2200 ret = ocfs2_xattr_bucket_get_name_value(inode,
2201 xh,
2202 i,
2203 &block_off,
2204 &new_offset);
2205 if (ret) {
2206 mlog_errno(ret);
2207 break;
2208 }
2209
2210 ret = ocfs2_read_block(inode, header_bh->b_blocknr + block_off,
2211 &name_bh);
2212 if (ret) {
2213 mlog_errno(ret);
2214 break;
2215 }
2216 xe_name = name_bh->b_data + new_offset;
2217
2218 cmp = memcmp(name, xe_name, name_len);
2219 brelse(name_bh);
2220 name_bh = NULL;
2221
2222 if (cmp == 0) {
2223 *xe_index = i;
2224 *found = 1;
2225 ret = 0;
2226 break;
2227 }
2228 }
2229
2230 return ret;
2231 }
2232
2233 /*
2234 * Find the specified xattr entry in a series of buckets.
2235 * This series start from p_blkno and last for num_clusters.
2236 * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
2237 * the num of the valid buckets.
2238 *
2239 * Return the buffer_head this xattr should reside in. And if the xattr's
2240 * hash is in the gap of 2 buckets, return the lower bucket.
2241 */
2242 static int ocfs2_xattr_bucket_find(struct inode *inode,
2243 int name_index,
2244 const char *name,
2245 u32 name_hash,
2246 u64 p_blkno,
2247 u32 first_hash,
2248 u32 num_clusters,
2249 struct ocfs2_xattr_search *xs)
2250 {
2251 int ret, found = 0;
2252 struct buffer_head *bh = NULL;
2253 struct buffer_head *lower_bh = NULL;
2254 struct ocfs2_xattr_header *xh = NULL;
2255 struct ocfs2_xattr_entry *xe = NULL;
2256 u16 index = 0;
2257 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2258 int low_bucket = 0, bucket, high_bucket;
2259 u32 last_hash;
2260 u64 blkno;
2261
2262 ret = ocfs2_read_block(inode, p_blkno, &bh);
2263 if (ret) {
2264 mlog_errno(ret);
2265 goto out;
2266 }
2267
2268 xh = (struct ocfs2_xattr_header *)bh->b_data;
2269 high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
2270
2271 while (low_bucket <= high_bucket) {
2272 brelse(bh);
2273 bh = NULL;
2274 bucket = (low_bucket + high_bucket) / 2;
2275
2276 blkno = p_blkno + bucket * blk_per_bucket;
2277
2278 ret = ocfs2_read_block(inode, blkno, &bh);
2279 if (ret) {
2280 mlog_errno(ret);
2281 goto out;
2282 }
2283
2284 xh = (struct ocfs2_xattr_header *)bh->b_data;
2285 xe = &xh->xh_entries[0];
2286 if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
2287 high_bucket = bucket - 1;
2288 continue;
2289 }
2290
2291 /*
2292 * Check whether the hash of the last entry in our
2293 * bucket is larger than the search one. for an empty
2294 * bucket, the last one is also the first one.
2295 */
2296 if (xh->xh_count)
2297 xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
2298
2299 last_hash = le32_to_cpu(xe->xe_name_hash);
2300
2301 /* record lower_bh which may be the insert place. */
2302 brelse(lower_bh);
2303 lower_bh = bh;
2304 bh = NULL;
2305
2306 if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
2307 low_bucket = bucket + 1;
2308 continue;
2309 }
2310
2311 /* the searched xattr should reside in this bucket if exists. */
2312 ret = ocfs2_find_xe_in_bucket(inode, lower_bh,
2313 name_index, name, name_hash,
2314 &index, &found);
2315 if (ret) {
2316 mlog_errno(ret);
2317 goto out;
2318 }
2319 break;
2320 }
2321
2322 /*
2323 * Record the bucket we have found.
2324 * When the xattr's hash value is in the gap of 2 buckets, we will
2325 * always set it to the previous bucket.
2326 */
2327 if (!lower_bh) {
2328 /*
2329 * We can't find any bucket whose first name_hash is less
2330 * than the find name_hash.
2331 */
2332 BUG_ON(bh->b_blocknr != p_blkno);
2333 lower_bh = bh;
2334 bh = NULL;
2335 }
2336 xs->bucket.bhs[0] = lower_bh;
2337 xs->bucket.xh = (struct ocfs2_xattr_header *)
2338 xs->bucket.bhs[0]->b_data;
2339 lower_bh = NULL;
2340
2341 xs->header = xs->bucket.xh;
2342 xs->base = xs->bucket.bhs[0]->b_data;
2343 xs->end = xs->base + inode->i_sb->s_blocksize;
2344
2345 if (found) {
2346 /*
2347 * If we have found the xattr enty, read all the blocks in
2348 * this bucket.
2349 */
2350 ret = ocfs2_read_blocks(inode, xs->bucket.bhs[0]->b_blocknr + 1,
2351 blk_per_bucket - 1, &xs->bucket.bhs[1],
2352 OCFS2_BH_CACHED);
2353 if (ret) {
2354 mlog_errno(ret);
2355 goto out;
2356 }
2357
2358 xs->here = &xs->header->xh_entries[index];
2359 mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name,
2360 (unsigned long long)xs->bucket.bhs[0]->b_blocknr, index);
2361 } else
2362 ret = -ENODATA;
2363
2364 out:
2365 brelse(bh);
2366 brelse(lower_bh);
2367 return ret;
2368 }
2369
2370 static int ocfs2_xattr_index_block_find(struct inode *inode,
2371 struct buffer_head *root_bh,
2372 int name_index,
2373 const char *name,
2374 struct ocfs2_xattr_search *xs)
2375 {
2376 int ret;
2377 struct ocfs2_xattr_block *xb =
2378 (struct ocfs2_xattr_block *)root_bh->b_data;
2379 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
2380 struct ocfs2_extent_list *el = &xb_root->xt_list;
2381 u64 p_blkno = 0;
2382 u32 first_hash, num_clusters = 0;
2383 u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
2384
2385 if (le16_to_cpu(el->l_next_free_rec) == 0)
2386 return -ENODATA;
2387
2388 mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n",
2389 name, name_hash, name_index);
2390
2391 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
2392 &num_clusters, el);
2393 if (ret) {
2394 mlog_errno(ret);
2395 goto out;
2396 }
2397
2398 BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
2399
2400 mlog(0, "find xattr extent rec %u clusters from %llu, the first hash "
2401 "in the rec is %u\n", num_clusters, p_blkno, first_hash);
2402
2403 ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
2404 p_blkno, first_hash, num_clusters, xs);
2405
2406 out:
2407 return ret;
2408 }
2409
2410 static int ocfs2_iterate_xattr_buckets(struct inode *inode,
2411 u64 blkno,
2412 u32 clusters,
2413 xattr_bucket_func *func,
2414 void *para)
2415 {
2416 int i, j, ret = 0;
2417 int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2418 u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
2419 u32 num_buckets = clusters * bpc;
2420 struct ocfs2_xattr_bucket bucket;
2421
2422 memset(&bucket, 0, sizeof(bucket));
2423
2424 mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n",
2425 clusters, blkno);
2426
2427 for (i = 0; i < num_buckets; i++, blkno += blk_per_bucket) {
2428 ret = ocfs2_read_blocks(inode, blkno, blk_per_bucket,
2429 bucket.bhs, OCFS2_BH_CACHED);
2430 if (ret) {
2431 mlog_errno(ret);
2432 goto out;
2433 }
2434
2435 bucket.xh = (struct ocfs2_xattr_header *)bucket.bhs[0]->b_data;
2436 /*
2437 * The real bucket num in this series of blocks is stored
2438 * in the 1st bucket.
2439 */
2440 if (i == 0)
2441 num_buckets = le16_to_cpu(bucket.xh->xh_num_buckets);
2442
2443 mlog(0, "iterating xattr bucket %llu, first hash %u\n", blkno,
2444 le32_to_cpu(bucket.xh->xh_entries[0].xe_name_hash));
2445 if (func) {
2446 ret = func(inode, &bucket, para);
2447 if (ret) {
2448 mlog_errno(ret);
2449 break;
2450 }
2451 }
2452
2453 for (j = 0; j < blk_per_bucket; j++)
2454 brelse(bucket.bhs[j]);
2455 memset(&bucket, 0, sizeof(bucket));
2456 }
2457
2458 out:
2459 for (j = 0; j < blk_per_bucket; j++)
2460 brelse(bucket.bhs[j]);
2461
2462 return ret;
2463 }
2464
2465 struct ocfs2_xattr_tree_list {
2466 char *buffer;
2467 size_t buffer_size;
2468 size_t result;
2469 };
2470
2471 static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
2472 struct ocfs2_xattr_header *xh,
2473 int index,
2474 int *block_off,
2475 int *new_offset)
2476 {
2477 u16 name_offset;
2478
2479 if (index < 0 || index >= le16_to_cpu(xh->xh_count))
2480 return -EINVAL;
2481
2482 name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
2483
2484 *block_off = name_offset >> inode->i_sb->s_blocksize_bits;
2485 *new_offset = name_offset % inode->i_sb->s_blocksize;
2486
2487 return 0;
2488 }
2489
2490 static int ocfs2_list_xattr_bucket(struct inode *inode,
2491 struct ocfs2_xattr_bucket *bucket,
2492 void *para)
2493 {
2494 int ret = 0, type;
2495 struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
2496 int i, block_off, new_offset;
2497 const char *prefix, *name;
2498
2499 for (i = 0 ; i < le16_to_cpu(bucket->xh->xh_count); i++) {
2500 struct ocfs2_xattr_entry *entry = &bucket->xh->xh_entries[i];
2501 type = ocfs2_xattr_get_type(entry);
2502 prefix = ocfs2_xattr_prefix(type);
2503
2504 if (prefix) {
2505 ret = ocfs2_xattr_bucket_get_name_value(inode,
2506 bucket->xh,
2507 i,
2508 &block_off,
2509 &new_offset);
2510 if (ret)
2511 break;
2512
2513 name = (const char *)bucket->bhs[block_off]->b_data +
2514 new_offset;
2515 ret = ocfs2_xattr_list_entry(xl->buffer,
2516 xl->buffer_size,
2517 &xl->result,
2518 prefix, name,
2519 entry->xe_name_len);
2520 if (ret)
2521 break;
2522 }
2523 }
2524
2525 return ret;
2526 }
2527
2528 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
2529 struct ocfs2_xattr_tree_root *xt,
2530 char *buffer,
2531 size_t buffer_size)
2532 {
2533 struct ocfs2_extent_list *el = &xt->xt_list;
2534 int ret = 0;
2535 u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
2536 u64 p_blkno = 0;
2537 struct ocfs2_xattr_tree_list xl = {
2538 .buffer = buffer,
2539 .buffer_size = buffer_size,
2540 .result = 0,
2541 };
2542
2543 if (le16_to_cpu(el->l_next_free_rec) == 0)
2544 return 0;
2545
2546 while (name_hash > 0) {
2547 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
2548 &e_cpos, &num_clusters, el);
2549 if (ret) {
2550 mlog_errno(ret);
2551 goto out;
2552 }
2553
2554 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
2555 ocfs2_list_xattr_bucket,
2556 &xl);
2557 if (ret) {
2558 mlog_errno(ret);
2559 goto out;
2560 }
2561
2562 if (e_cpos == 0)
2563 break;
2564
2565 name_hash = e_cpos - 1;
2566 }
2567
2568 ret = xl.result;
2569 out:
2570 return ret;
2571 }
2572
2573 static int cmp_xe(const void *a, const void *b)
2574 {
2575 const struct ocfs2_xattr_entry *l = a, *r = b;
2576 u32 l_hash = le32_to_cpu(l->xe_name_hash);
2577 u32 r_hash = le32_to_cpu(r->xe_name_hash);
2578
2579 if (l_hash > r_hash)
2580 return 1;
2581 if (l_hash < r_hash)
2582 return -1;
2583 return 0;
2584 }
2585
2586 static void swap_xe(void *a, void *b, int size)
2587 {
2588 struct ocfs2_xattr_entry *l = a, *r = b, tmp;
2589
2590 tmp = *l;
2591 memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
2592 memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
2593 }
2594
2595 /*
2596 * When the ocfs2_xattr_block is filled up, new bucket will be created
2597 * and all the xattr entries will be moved to the new bucket.
2598 * Note: we need to sort the entries since they are not saved in order
2599 * in the ocfs2_xattr_block.
2600 */
2601 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
2602 struct buffer_head *xb_bh,
2603 struct buffer_head *xh_bh,
2604 struct buffer_head *data_bh)
2605 {
2606 int i, blocksize = inode->i_sb->s_blocksize;
2607 u16 offset, size, off_change;
2608 struct ocfs2_xattr_entry *xe;
2609 struct ocfs2_xattr_block *xb =
2610 (struct ocfs2_xattr_block *)xb_bh->b_data;
2611 struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
2612 struct ocfs2_xattr_header *xh =
2613 (struct ocfs2_xattr_header *)xh_bh->b_data;
2614 u16 count = le16_to_cpu(xb_xh->xh_count);
2615 char *target = xh_bh->b_data, *src = xb_bh->b_data;
2616
2617 mlog(0, "cp xattr from block %llu to bucket %llu\n",
2618 (unsigned long long)xb_bh->b_blocknr,
2619 (unsigned long long)xh_bh->b_blocknr);
2620
2621 memset(xh_bh->b_data, 0, blocksize);
2622 if (data_bh)
2623 memset(data_bh->b_data, 0, blocksize);
2624 /*
2625 * Since the xe_name_offset is based on ocfs2_xattr_header,
2626 * there is a offset change corresponding to the change of
2627 * ocfs2_xattr_header's position.
2628 */
2629 off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
2630 xe = &xb_xh->xh_entries[count - 1];
2631 offset = le16_to_cpu(xe->xe_name_offset) + off_change;
2632 size = blocksize - offset;
2633
2634 /* copy all the names and values. */
2635 if (data_bh)
2636 target = data_bh->b_data;
2637 memcpy(target + offset, src + offset, size);
2638
2639 /* Init new header now. */
2640 xh->xh_count = xb_xh->xh_count;
2641 xh->xh_num_buckets = cpu_to_le16(1);
2642 xh->xh_name_value_len = cpu_to_le16(size);
2643 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
2644
2645 /* copy all the entries. */
2646 target = xh_bh->b_data;
2647 offset = offsetof(struct ocfs2_xattr_header, xh_entries);
2648 size = count * sizeof(struct ocfs2_xattr_entry);
2649 memcpy(target + offset, (char *)xb_xh + offset, size);
2650
2651 /* Change the xe offset for all the xe because of the move. */
2652 off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
2653 offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
2654 for (i = 0; i < count; i++)
2655 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
2656
2657 mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n",
2658 offset, size, off_change);
2659
2660 sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
2661 cmp_xe, swap_xe);
2662 }
2663
2664 /*
2665 * After we move xattr from block to index btree, we have to
2666 * update ocfs2_xattr_search to the new xe and base.
2667 *
2668 * When the entry is in xattr block, xattr_bh indicates the storage place.
2669 * While if the entry is in index b-tree, "bucket" indicates the
2670 * real place of the xattr.
2671 */
2672 static int ocfs2_xattr_update_xattr_search(struct inode *inode,
2673 struct ocfs2_xattr_search *xs,
2674 struct buffer_head *old_bh,
2675 struct buffer_head *new_bh)
2676 {
2677 int ret = 0;
2678 char *buf = old_bh->b_data;
2679 struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
2680 struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
2681 int i, blocksize = inode->i_sb->s_blocksize;
2682 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2683
2684 xs->bucket.bhs[0] = new_bh;
2685 get_bh(new_bh);
2686 xs->bucket.xh = (struct ocfs2_xattr_header *)xs->bucket.bhs[0]->b_data;
2687 xs->header = xs->bucket.xh;
2688
2689 xs->base = new_bh->b_data;
2690 xs->end = xs->base + inode->i_sb->s_blocksize;
2691
2692 if (!xs->not_found) {
2693 if (OCFS2_XATTR_BUCKET_SIZE != blocksize) {
2694 ret = ocfs2_read_blocks(inode,
2695 xs->bucket.bhs[0]->b_blocknr + 1,
2696 blk_per_bucket - 1, &xs->bucket.bhs[1],
2697 OCFS2_BH_CACHED);
2698 if (ret) {
2699 mlog_errno(ret);
2700 return ret;
2701 }
2702
2703 i = xs->here - old_xh->xh_entries;
2704 xs->here = &xs->header->xh_entries[i];
2705 }
2706 }
2707
2708 return ret;
2709 }
2710
2711 static int ocfs2_xattr_create_index_block(struct inode *inode,
2712 struct ocfs2_xattr_search *xs)
2713 {
2714 int ret, credits = OCFS2_SUBALLOC_ALLOC;
2715 u32 bit_off, len;
2716 u64 blkno;
2717 handle_t *handle;
2718 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2719 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2720 struct ocfs2_alloc_context *data_ac;
2721 struct buffer_head *xh_bh = NULL, *data_bh = NULL;
2722 struct buffer_head *xb_bh = xs->xattr_bh;
2723 struct ocfs2_xattr_block *xb =
2724 (struct ocfs2_xattr_block *)xb_bh->b_data;
2725 struct ocfs2_xattr_tree_root *xr;
2726 u16 xb_flags = le16_to_cpu(xb->xb_flags);
2727 u16 bpb = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2728
2729 mlog(0, "create xattr index block for %llu\n",
2730 (unsigned long long)xb_bh->b_blocknr);
2731
2732 BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
2733
2734 ret = ocfs2_reserve_clusters(osb, 1, &data_ac);
2735 if (ret) {
2736 mlog_errno(ret);
2737 goto out;
2738 }
2739
2740 /*
2741 * XXX:
2742 * We can use this lock for now, and maybe move to a dedicated mutex
2743 * if performance becomes a problem later.
2744 */
2745 down_write(&oi->ip_alloc_sem);
2746
2747 /*
2748 * 3 more credits, one for xattr block update, one for the 1st block
2749 * of the new xattr bucket and one for the value/data.
2750 */
2751 credits += 3;
2752 handle = ocfs2_start_trans(osb, credits);
2753 if (IS_ERR(handle)) {
2754 ret = PTR_ERR(handle);
2755 mlog_errno(ret);
2756 goto out_sem;
2757 }
2758
2759 ret = ocfs2_journal_access(handle, inode, xb_bh,
2760 OCFS2_JOURNAL_ACCESS_WRITE);
2761 if (ret) {
2762 mlog_errno(ret);
2763 goto out_commit;
2764 }
2765
2766 ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off, &len);
2767 if (ret) {
2768 mlog_errno(ret);
2769 goto out_commit;
2770 }
2771
2772 /*
2773 * The bucket may spread in many blocks, and
2774 * we will only touch the 1st block and the last block
2775 * in the whole bucket(one for entry and one for data).
2776 */
2777 blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
2778
2779 mlog(0, "allocate 1 cluster from %llu to xattr block\n", blkno);
2780
2781 xh_bh = sb_getblk(inode->i_sb, blkno);
2782 if (!xh_bh) {
2783 ret = -EIO;
2784 mlog_errno(ret);
2785 goto out_commit;
2786 }
2787
2788 ocfs2_set_new_buffer_uptodate(inode, xh_bh);
2789
2790 ret = ocfs2_journal_access(handle, inode, xh_bh,
2791 OCFS2_JOURNAL_ACCESS_CREATE);
2792 if (ret) {
2793 mlog_errno(ret);
2794 goto out_commit;
2795 }
2796
2797 if (bpb > 1) {
2798 data_bh = sb_getblk(inode->i_sb, blkno + bpb - 1);
2799 if (!data_bh) {
2800 ret = -EIO;
2801 mlog_errno(ret);
2802 goto out_commit;
2803 }
2804
2805 ocfs2_set_new_buffer_uptodate(inode, data_bh);
2806
2807 ret = ocfs2_journal_access(handle, inode, data_bh,
2808 OCFS2_JOURNAL_ACCESS_CREATE);
2809 if (ret) {
2810 mlog_errno(ret);
2811 goto out_commit;
2812 }
2813 }
2814
2815 ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xh_bh, data_bh);
2816
2817 ocfs2_journal_dirty(handle, xh_bh);
2818 if (data_bh)
2819 ocfs2_journal_dirty(handle, data_bh);
2820
2821 ocfs2_xattr_update_xattr_search(inode, xs, xb_bh, xh_bh);
2822
2823 /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
2824 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
2825 offsetof(struct ocfs2_xattr_block, xb_attrs));
2826
2827 xr = &xb->xb_attrs.xb_root;
2828 xr->xt_clusters = cpu_to_le32(1);
2829 xr->xt_last_eb_blk = 0;
2830 xr->xt_list.l_tree_depth = 0;
2831 xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
2832 xr->xt_list.l_next_free_rec = cpu_to_le16(1);
2833
2834 xr->xt_list.l_recs[0].e_cpos = 0;
2835 xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
2836 xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
2837
2838 xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
2839
2840 ret = ocfs2_journal_dirty(handle, xb_bh);
2841 if (ret) {
2842 mlog_errno(ret);
2843 goto out_commit;
2844 }
2845
2846 out_commit:
2847 ocfs2_commit_trans(osb, handle);
2848
2849 out_sem:
2850 up_write(&oi->ip_alloc_sem);
2851
2852 out:
2853 if (data_ac)
2854 ocfs2_free_alloc_context(data_ac);
2855
2856 brelse(xh_bh);
2857 brelse(data_bh);
2858
2859 return ret;
2860 }
2861
2862 static int cmp_xe_offset(const void *a, const void *b)
2863 {
2864 const struct ocfs2_xattr_entry *l = a, *r = b;
2865 u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
2866 u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
2867
2868 if (l_name_offset < r_name_offset)
2869 return 1;
2870 if (l_name_offset > r_name_offset)
2871 return -1;
2872 return 0;
2873 }
2874
2875 /*
2876 * defrag a xattr bucket if we find that the bucket has some
2877 * holes beteen name/value pairs.
2878 * We will move all the name/value pairs to the end of the bucket
2879 * so that we can spare some space for insertion.
2880 */
2881 static int ocfs2_defrag_xattr_bucket(struct inode *inode,
2882 struct ocfs2_xattr_bucket *bucket)
2883 {
2884 int ret, i;
2885 size_t end, offset, len, value_len;
2886 struct ocfs2_xattr_header *xh;
2887 char *entries, *buf, *bucket_buf = NULL;
2888 u64 blkno = bucket->bhs[0]->b_blocknr;
2889 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2890 u16 xh_free_start;
2891 size_t blocksize = inode->i_sb->s_blocksize;
2892 handle_t *handle;
2893 struct buffer_head **bhs;
2894 struct ocfs2_xattr_entry *xe;
2895
2896 bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
2897 GFP_NOFS);
2898 if (!bhs)
2899 return -ENOMEM;
2900
2901 ret = ocfs2_read_blocks(inode, blkno, blk_per_bucket, bhs,
2902 OCFS2_BH_CACHED);
2903 if (ret)
2904 goto out;
2905
2906 /*
2907 * In order to make the operation more efficient and generic,
2908 * we copy all the blocks into a contiguous memory and do the
2909 * defragment there, so if anything is error, we will not touch
2910 * the real block.
2911 */
2912 bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
2913 if (!bucket_buf) {
2914 ret = -EIO;
2915 goto out;
2916 }
2917
2918 buf = bucket_buf;
2919 for (i = 0; i < blk_per_bucket; i++, buf += blocksize)
2920 memcpy(buf, bhs[i]->b_data, blocksize);
2921
2922 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), blk_per_bucket);
2923 if (IS_ERR(handle)) {
2924 ret = PTR_ERR(handle);
2925 handle = NULL;
2926 mlog_errno(ret);
2927 goto out;
2928 }
2929
2930 for (i = 0; i < blk_per_bucket; i++) {
2931 ret = ocfs2_journal_access(handle, inode, bhs[i],
2932 OCFS2_JOURNAL_ACCESS_WRITE);
2933 if (ret < 0) {
2934 mlog_errno(ret);
2935 goto commit;
2936 }
2937 }
2938
2939 xh = (struct ocfs2_xattr_header *)bucket_buf;
2940 entries = (char *)xh->xh_entries;
2941 xh_free_start = le16_to_cpu(xh->xh_free_start);
2942
2943 mlog(0, "adjust xattr bucket in %llu, count = %u, "
2944 "xh_free_start = %u, xh_name_value_len = %u.\n",
2945 blkno, le16_to_cpu(xh->xh_count), xh_free_start,
2946 le16_to_cpu(xh->xh_name_value_len));
2947
2948 /*
2949 * sort all the entries by their offset.
2950 * the largest will be the first, so that we can
2951 * move them to the end one by one.
2952 */
2953 sort(entries, le16_to_cpu(xh->xh_count),
2954 sizeof(struct ocfs2_xattr_entry),
2955 cmp_xe_offset, swap_xe);
2956
2957 /* Move all name/values to the end of the bucket. */
2958 xe = xh->xh_entries;
2959 end = OCFS2_XATTR_BUCKET_SIZE;
2960 for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
2961 offset = le16_to_cpu(xe->xe_name_offset);
2962 if (ocfs2_xattr_is_local(xe))
2963 value_len = OCFS2_XATTR_SIZE(
2964 le64_to_cpu(xe->xe_value_size));
2965 else
2966 value_len = OCFS2_XATTR_ROOT_SIZE;
2967 len = OCFS2_XATTR_SIZE(xe->xe_name_len) + value_len;
2968
2969 /*
2970 * We must make sure that the name/value pair
2971 * exist in the same block. So adjust end to
2972 * the previous block end if needed.
2973 */
2974 if (((end - len) / blocksize !=
2975 (end - 1) / blocksize))
2976 end = end - end % blocksize;
2977
2978 if (end > offset + len) {
2979 memmove(bucket_buf + end - len,
2980 bucket_buf + offset, len);
2981 xe->xe_name_offset = cpu_to_le16(end - len);
2982 }
2983
2984 mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
2985 "bucket %llu\n", (unsigned long long)blkno);
2986
2987 end -= len;
2988 }
2989
2990 mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
2991 "bucket %llu\n", (unsigned long long)blkno);
2992
2993 if (xh_free_start == end)
2994 goto commit;
2995
2996 memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
2997 xh->xh_free_start = cpu_to_le16(end);
2998
2999 /* sort the entries by their name_hash. */
3000 sort(entries, le16_to_cpu(xh->xh_count),
3001 sizeof(struct ocfs2_xattr_entry),
3002 cmp_xe, swap_xe);
3003
3004 buf = bucket_buf;
3005 for (i = 0; i < blk_per_bucket; i++, buf += blocksize) {
3006 memcpy(bhs[i]->b_data, buf, blocksize);
3007 ocfs2_journal_dirty(handle, bhs[i]);
3008 }
3009
3010 commit:
3011 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
3012 out:
3013
3014 if (bhs) {
3015 for (i = 0; i < blk_per_bucket; i++)
3016 brelse(bhs[i]);
3017 }
3018 kfree(bhs);
3019
3020 kfree(bucket_buf);
3021 return ret;
3022 }
3023
3024 /*
3025 * Move half nums of the xattr bucket in the previous cluster to this new
3026 * cluster. We only touch the last cluster of the previous extend record.
3027 *
3028 * first_bh is the first buffer_head of a series of bucket in the same
3029 * extent rec and header_bh is the header of one bucket in this cluster.
3030 * They will be updated if we move the data header_bh contains to the new
3031 * cluster. first_hash will be set as the 1st xe's name_hash of the new cluster.
3032 */
3033 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
3034 handle_t *handle,
3035 struct buffer_head **first_bh,
3036 struct buffer_head **header_bh,
3037 u64 new_blkno,
3038 u64 prev_blkno,
3039 u32 num_clusters,
3040 u32 *first_hash)
3041 {
3042 int i, ret, credits;
3043 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3044 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3045 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
3046 int blocksize = inode->i_sb->s_blocksize;
3047 struct buffer_head *old_bh, *new_bh, *prev_bh, *new_first_bh = NULL;
3048 struct ocfs2_xattr_header *new_xh;
3049 struct ocfs2_xattr_header *xh =
3050 (struct ocfs2_xattr_header *)((*first_bh)->b_data);
3051
3052 BUG_ON(le16_to_cpu(xh->xh_num_buckets) < num_buckets);
3053 BUG_ON(OCFS2_XATTR_BUCKET_SIZE == osb->s_clustersize);
3054
3055 prev_bh = *first_bh;
3056 get_bh(prev_bh);
3057 xh = (struct ocfs2_xattr_header *)prev_bh->b_data;
3058
3059 prev_blkno += (num_clusters - 1) * bpc + bpc / 2;
3060
3061 mlog(0, "move half of xattrs in cluster %llu to %llu\n",
3062 prev_blkno, new_blkno);
3063
3064 /*
3065 * We need to update the 1st half of the new cluster and
3066 * 1 more for the update of the 1st bucket of the previous
3067 * extent record.
3068 */
3069 credits = bpc / 2 + 1;
3070 ret = ocfs2_extend_trans(handle, credits);
3071 if (ret) {
3072 mlog_errno(ret);
3073 goto out;
3074 }
3075
3076 ret = ocfs2_journal_access(handle, inode, prev_bh,
3077 OCFS2_JOURNAL_ACCESS_WRITE);
3078 if (ret) {
3079 mlog_errno(ret);
3080 goto out;
3081 }
3082
3083 for (i = 0; i < bpc / 2; i++, prev_blkno++, new_blkno++) {
3084 old_bh = new_bh = NULL;
3085 new_bh = sb_getblk(inode->i_sb, new_blkno);
3086 if (!new_bh) {
3087 ret = -EIO;
3088 mlog_errno(ret);
3089 goto out;
3090 }
3091
3092 ocfs2_set_new_buffer_uptodate(inode, new_bh);
3093
3094 ret = ocfs2_journal_access(handle, inode, new_bh,
3095 OCFS2_JOURNAL_ACCESS_CREATE);
3096 if (ret < 0) {
3097 mlog_errno(ret);
3098 brelse(new_bh);
3099 goto out;
3100 }
3101
3102 ret = ocfs2_read_block(inode, prev_blkno, &old_bh);
3103 if (ret < 0) {
3104 mlog_errno(ret);
3105 brelse(new_bh);
3106 goto out;
3107 }
3108
3109 memcpy(new_bh->b_data, old_bh->b_data, blocksize);
3110
3111 if (i == 0) {
3112 new_xh = (struct ocfs2_xattr_header *)new_bh->b_data;
3113 new_xh->xh_num_buckets = cpu_to_le16(num_buckets / 2);
3114
3115 if (first_hash)
3116 *first_hash = le32_to_cpu(
3117 new_xh->xh_entries[0].xe_name_hash);
3118 new_first_bh = new_bh;
3119 get_bh(new_first_bh);
3120 }
3121
3122 ocfs2_journal_dirty(handle, new_bh);
3123
3124 if (*header_bh == old_bh) {
3125 brelse(*header_bh);
3126 *header_bh = new_bh;
3127 get_bh(*header_bh);
3128
3129 brelse(*first_bh);
3130 *first_bh = new_first_bh;
3131 get_bh(*first_bh);
3132 }
3133 brelse(new_bh);
3134 brelse(old_bh);
3135 }
3136
3137 le16_add_cpu(&xh->xh_num_buckets, -(num_buckets / 2));
3138
3139 ocfs2_journal_dirty(handle, prev_bh);
3140 out:
3141 brelse(prev_bh);
3142 brelse(new_first_bh);
3143 return ret;
3144 }
3145
3146 static int ocfs2_read_xattr_bucket(struct inode *inode,
3147 u64 blkno,
3148 struct buffer_head **bhs,
3149 int new)
3150 {
3151 int ret = 0;
3152 u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3153
3154 if (!new)
3155 return ocfs2_read_blocks(inode, blkno,
3156 blk_per_bucket, bhs,
3157 OCFS2_BH_CACHED);
3158
3159 for (i = 0; i < blk_per_bucket; i++) {
3160 bhs[i] = sb_getblk(inode->i_sb, blkno + i);
3161 if (bhs[i] == NULL) {
3162 ret = -EIO;
3163 mlog_errno(ret);
3164 break;
3165 }
3166 ocfs2_set_new_buffer_uptodate(inode, bhs[i]);
3167 }
3168
3169 return ret;
3170 }
3171
3172 /*
3173 * Move half num of the xattrs in old bucket(blk) to new bucket(new_blk).
3174 * first_hash will record the 1st hash of the new bucket.
3175 */
3176 static int ocfs2_half_xattr_bucket(struct inode *inode,
3177 handle_t *handle,
3178 u64 blk,
3179 u64 new_blk,
3180 u32 *first_hash,
3181 int new_bucket_head)
3182 {
3183 int ret, i;
3184 u16 count, start, len, name_value_len, xe_len, name_offset;
3185 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3186 struct buffer_head **s_bhs, **t_bhs = NULL;
3187 struct ocfs2_xattr_header *xh;
3188 struct ocfs2_xattr_entry *xe;
3189 int blocksize = inode->i_sb->s_blocksize;
3190
3191 mlog(0, "move half of xattrs from bucket %llu to %llu\n",
3192 blk, new_blk);
3193
3194 s_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
3195 if (!s_bhs)
3196 return -ENOMEM;
3197
3198 ret = ocfs2_read_xattr_bucket(inode, blk, s_bhs, 0);
3199 if (ret) {
3200 mlog_errno(ret);
3201 goto out;
3202 }
3203
3204 ret = ocfs2_journal_access(handle, inode, s_bhs[0],
3205 OCFS2_JOURNAL_ACCESS_WRITE);
3206 if (ret) {
3207 mlog_errno(ret);
3208 goto out;
3209 }
3210
3211 t_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
3212 if (!t_bhs) {
3213 ret = -ENOMEM;
3214 goto out;
3215 }
3216
3217 ret = ocfs2_read_xattr_bucket(inode, new_blk, t_bhs, new_bucket_head);
3218 if (ret) {
3219 mlog_errno(ret);
3220 goto out;
3221 }
3222
3223 for (i = 0; i < blk_per_bucket; i++) {
3224 ret = ocfs2_journal_access(handle, inode, t_bhs[i],
3225 OCFS2_JOURNAL_ACCESS_CREATE);
3226 if (ret) {
3227 mlog_errno(ret);
3228 goto out;
3229 }
3230 }
3231
3232 /* copy the whole bucket to the new first. */
3233 for (i = 0; i < blk_per_bucket; i++)
3234 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);
3235
3236 /* update the new bucket. */
3237 xh = (struct ocfs2_xattr_header *)t_bhs[0]->b_data;
3238 count = le16_to_cpu(xh->xh_count);
3239 start = count / 2;
3240
3241 /*
3242 * Calculate the total name/value len and xh_free_start for
3243 * the old bucket first.
3244 */
3245 name_offset = OCFS2_XATTR_BUCKET_SIZE;
3246 name_value_len = 0;
3247 for (i = 0; i < start; i++) {
3248 xe = &xh->xh_entries[i];
3249 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3250 if (ocfs2_xattr_is_local(xe))
3251 xe_len +=
3252 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3253 else
3254 xe_len += OCFS2_XATTR_ROOT_SIZE;
3255 name_value_len += xe_len;
3256 if (le16_to_cpu(xe->xe_name_offset) < name_offset)
3257 name_offset = le16_to_cpu(xe->xe_name_offset);
3258 }
3259
3260 /*
3261 * Now begin the modification to the new bucket.
3262 *
3263 * In the new bucket, We just move the xattr entry to the beginning
3264 * and don't touch the name/value. So there will be some holes in the
3265 * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
3266 * called.
3267 */
3268 xe = &xh->xh_entries[start];
3269 len = sizeof(struct ocfs2_xattr_entry) * (count - start);
3270 mlog(0, "mv xattr entry len %d from %d to %d\n", len,
3271 (int)((char *)xe - (char *)xh),
3272 (int)((char *)xh->xh_entries - (char *)xh));
3273 memmove((char *)xh->xh_entries, (char *)xe, len);
3274 xe = &xh->xh_entries[count - start];
3275 len = sizeof(struct ocfs2_xattr_entry) * start;
3276 memset((char *)xe, 0, len);
3277
3278 le16_add_cpu(&xh->xh_count, -start);
3279 le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
3280
3281 /* Calculate xh_free_start for the new bucket. */
3282 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
3283 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3284 xe = &xh->xh_entries[i];
3285 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3286 if (ocfs2_xattr_is_local(xe))
3287 xe_len +=
3288 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3289 else
3290 xe_len += OCFS2_XATTR_ROOT_SIZE;
3291 if (le16_to_cpu(xe->xe_name_offset) <
3292 le16_to_cpu(xh->xh_free_start))
3293 xh->xh_free_start = xe->xe_name_offset;
3294 }
3295
3296 /* set xh->xh_num_buckets for the new xh. */
3297 if (new_bucket_head)
3298 xh->xh_num_buckets = cpu_to_le16(1);
3299 else
3300 xh->xh_num_buckets = 0;
3301
3302 for (i = 0; i < blk_per_bucket; i++) {
3303 ocfs2_journal_dirty(handle, t_bhs[i]);
3304 if (ret)
3305 mlog_errno(ret);
3306 }
3307
3308 /* store the first_hash of the new bucket. */
3309 if (first_hash)
3310 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3311
3312 /*
3313 * Now only update the 1st block of the old bucket.
3314 * Please note that the entry has been sorted already above.
3315 */
3316 xh = (struct ocfs2_xattr_header *)s_bhs[0]->b_data;
3317 memset(&xh->xh_entries[start], 0,
3318 sizeof(struct ocfs2_xattr_entry) * (count - start));
3319 xh->xh_count = cpu_to_le16(start);
3320 xh->xh_free_start = cpu_to_le16(name_offset);
3321 xh->xh_name_value_len = cpu_to_le16(name_value_len);
3322
3323 ocfs2_journal_dirty(handle, s_bhs[0]);
3324 if (ret)
3325 mlog_errno(ret);
3326
3327 out:
3328 if (s_bhs) {
3329 for (i = 0; i < blk_per_bucket; i++)
3330 brelse(s_bhs[i]);
3331 }
3332 kfree(s_bhs);
3333
3334 if (t_bhs) {
3335 for (i = 0; i < blk_per_bucket; i++)
3336 brelse(t_bhs[i]);
3337 }
3338 kfree(t_bhs);
3339
3340 return ret;
3341 }
3342
3343 /*
3344 * Copy xattr from one bucket to another bucket.
3345 *
3346 * The caller must make sure that the journal transaction
3347 * has enough space for journaling.
3348 */
3349 static int ocfs2_cp_xattr_bucket(struct inode *inode,
3350 handle_t *handle,
3351 u64 s_blkno,
3352 u64 t_blkno,
3353 int t_is_new)
3354 {
3355 int ret, i;
3356 int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3357 int blocksize = inode->i_sb->s_blocksize;
3358 struct buffer_head **s_bhs, **t_bhs = NULL;
3359
3360 BUG_ON(s_blkno == t_blkno);
3361
3362 mlog(0, "cp bucket %llu to %llu, target is %d\n",
3363 s_blkno, t_blkno, t_is_new);
3364
3365 s_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
3366 GFP_NOFS);
3367 if (!s_bhs)
3368 return -ENOMEM;
3369
3370 ret = ocfs2_read_xattr_bucket(inode, s_blkno, s_bhs, 0);
3371 if (ret)
3372 goto out;
3373
3374 t_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
3375 GFP_NOFS);
3376 if (!t_bhs) {
3377 ret = -ENOMEM;
3378 goto out;
3379 }
3380
3381 ret = ocfs2_read_xattr_bucket(inode, t_blkno, t_bhs, t_is_new);
3382 if (ret)
3383 goto out;
3384
3385 for (i = 0; i < blk_per_bucket; i++) {
3386 ret = ocfs2_journal_access(handle, inode, t_bhs[i],
3387 OCFS2_JOURNAL_ACCESS_WRITE);
3388 if (ret)
3389 goto out;
3390 }
3391
3392 for (i = 0; i < blk_per_bucket; i++) {
3393 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);
3394 ocfs2_journal_dirty(handle, t_bhs[i]);
3395 }
3396
3397 out:
3398 if (s_bhs) {
3399 for (i = 0; i < blk_per_bucket; i++)
3400 brelse(s_bhs[i]);
3401 }
3402 kfree(s_bhs);
3403
3404 if (t_bhs) {
3405 for (i = 0; i < blk_per_bucket; i++)
3406 brelse(t_bhs[i]);
3407 }
3408 kfree(t_bhs);
3409
3410 return ret;
3411 }
3412
3413 /*
3414 * Copy one xattr cluster from src_blk to to_blk.
3415 * The to_blk will become the first bucket header of the cluster, so its
3416 * xh_num_buckets will be initialized as the bucket num in the cluster.
3417 */
3418 static int ocfs2_cp_xattr_cluster(struct inode *inode,
3419 handle_t *handle,
3420 struct buffer_head *first_bh,
3421 u64 src_blk,
3422 u64 to_blk,
3423 u32 *first_hash)
3424 {
3425 int i, ret, credits;
3426 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3427 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3428 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
3429 struct buffer_head *bh = NULL;
3430 struct ocfs2_xattr_header *xh;
3431 u64 to_blk_start = to_blk;
3432
3433 mlog(0, "cp xattrs from cluster %llu to %llu\n", src_blk, to_blk);
3434
3435 /*
3436 * We need to update the new cluster and 1 more for the update of
3437 * the 1st bucket of the previous extent rec.
3438 */
3439 credits = bpc + 1;
3440 ret = ocfs2_extend_trans(handle, credits);
3441 if (ret) {
3442 mlog_errno(ret);
3443 goto out;
3444 }
3445
3446 ret = ocfs2_journal_access(handle, inode, first_bh,
3447 OCFS2_JOURNAL_ACCESS_WRITE);
3448 if (ret) {
3449 mlog_errno(ret);
3450 goto out;
3451 }
3452
3453 for (i = 0; i < num_buckets; i++) {
3454 ret = ocfs2_cp_xattr_bucket(inode, handle,
3455 src_blk, to_blk, 1);
3456 if (ret) {
3457 mlog_errno(ret);
3458 goto out;
3459 }
3460
3461 src_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3462 to_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3463 }
3464
3465 /* update the old bucket header. */
3466 xh = (struct ocfs2_xattr_header *)first_bh->b_data;
3467 le16_add_cpu(&xh->xh_num_buckets, -num_buckets);
3468
3469 ocfs2_journal_dirty(handle, first_bh);
3470
3471 /* update the new bucket header. */
3472 ret = ocfs2_read_block(inode, to_blk_start, &bh);
3473 if (ret < 0) {
3474 mlog_errno(ret);
3475 goto out;
3476 }
3477
3478 ret = ocfs2_journal_access(handle, inode, bh,
3479 OCFS2_JOURNAL_ACCESS_WRITE);
3480 if (ret) {
3481 mlog_errno(ret);
3482 goto out;
3483 }
3484
3485 xh = (struct ocfs2_xattr_header *)bh->b_data;
3486 xh->xh_num_buckets = cpu_to_le16(num_buckets);
3487
3488 ocfs2_journal_dirty(handle, bh);
3489
3490 if (first_hash)
3491 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3492 out:
3493 brelse(bh);
3494 return ret;
3495 }
3496
3497 /*
3498 * Move half of the xattrs in this cluster to the new cluster.
3499 * This function should only be called when bucket size == cluster size.
3500 * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
3501 */
3502 static int ocfs2_half_xattr_cluster(struct inode *inode,
3503 handle_t *handle,
3504 u64 prev_blk,
3505 u64 new_blk,
3506 u32 *first_hash)
3507 {
3508 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3509 int ret, credits = 2 * blk_per_bucket;
3510
3511 BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
3512
3513 ret = ocfs2_extend_trans(handle, credits);
3514 if (ret) {
3515 mlog_errno(ret);
3516 return ret;
3517 }
3518
3519 /* Move half of the xattr in start_blk to the next bucket. */
3520 return ocfs2_half_xattr_bucket(inode, handle, prev_blk,
3521 new_blk, first_hash, 1);
3522 }
3523
3524 /*
3525 * Move some xattrs from the old cluster to the new one since they are not
3526 * contiguous in ocfs2 xattr tree.
3527 *
3528 * new_blk starts a new separate cluster, and we will move some xattrs from
3529 * prev_blk to it. v_start will be set as the first name hash value in this
3530 * new cluster so that it can be used as e_cpos during tree insertion and
3531 * don't collide with our original b-tree operations. first_bh and header_bh
3532 * will also be updated since they will be used in ocfs2_extend_xattr_bucket
3533 * to extend the insert bucket.
3534 *
3535 * The problem is how much xattr should we move to the new one and when should
3536 * we update first_bh and header_bh?
3537 * 1. If cluster size > bucket size, that means the previous cluster has more
3538 * than 1 bucket, so just move half nums of bucket into the new cluster and
3539 * update the first_bh and header_bh if the insert bucket has been moved
3540 * to the new cluster.
3541 * 2. If cluster_size == bucket_size:
3542 * a) If the previous extent rec has more than one cluster and the insert
3543 * place isn't in the last cluster, copy the entire last cluster to the
3544 * new one. This time, we don't need to upate the first_bh and header_bh
3545 * since they will not be moved into the new cluster.
3546 * b) Otherwise, move the bottom half of the xattrs in the last cluster into
3547 * the new one. And we set the extend flag to zero if the insert place is
3548 * moved into the new allocated cluster since no extend is needed.
3549 */
3550 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
3551 handle_t *handle,
3552 struct buffer_head **first_bh,
3553 struct buffer_head **header_bh,
3554 u64 new_blk,
3555 u64 prev_blk,
3556 u32 prev_clusters,
3557 u32 *v_start,
3558 int *extend)
3559 {
3560 int ret = 0;
3561 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3562
3563 mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n",
3564 prev_blk, prev_clusters, new_blk);
3565
3566 if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1)
3567 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
3568 handle,
3569 first_bh,
3570 header_bh,
3571 new_blk,
3572 prev_blk,
3573 prev_clusters,
3574 v_start);
3575 else {
3576 u64 last_blk = prev_blk + bpc * (prev_clusters - 1);
3577
3578 if (prev_clusters > 1 && (*header_bh)->b_blocknr != last_blk)
3579 ret = ocfs2_cp_xattr_cluster(inode, handle, *first_bh,
3580 last_blk, new_blk,
3581 v_start);
3582 else {
3583 ret = ocfs2_half_xattr_cluster(inode, handle,
3584 last_blk, new_blk,
3585 v_start);
3586
3587 if ((*header_bh)->b_blocknr == last_blk && extend)
3588 *extend = 0;
3589 }
3590 }
3591
3592 return ret;
3593 }
3594
3595 /*
3596 * Add a new cluster for xattr storage.
3597 *
3598 * If the new cluster is contiguous with the previous one, it will be
3599 * appended to the same extent record, and num_clusters will be updated.
3600 * If not, we will insert a new extent for it and move some xattrs in
3601 * the last cluster into the new allocated one.
3602 * We also need to limit the maximum size of a btree leaf, otherwise we'll
3603 * lose the benefits of hashing because we'll have to search large leaves.
3604 * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
3605 * if it's bigger).
3606 *
3607 * first_bh is the first block of the previous extent rec and header_bh
3608 * indicates the bucket we will insert the new xattrs. They will be updated
3609 * when the header_bh is moved into the new cluster.
3610 */
3611 static int ocfs2_add_new_xattr_cluster(struct inode *inode,
3612 struct buffer_head *root_bh,
3613 struct buffer_head **first_bh,
3614 struct buffer_head **header_bh,
3615 u32 *num_clusters,
3616 u32 prev_cpos,
3617 u64 prev_blkno,
3618 int *extend)
3619 {
3620 int ret, credits;
3621 u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3622 u32 prev_clusters = *num_clusters;
3623 u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
3624 u64 block;
3625 handle_t *handle = NULL;
3626 struct ocfs2_alloc_context *data_ac = NULL;
3627 struct ocfs2_alloc_context *meta_ac = NULL;
3628 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3629 struct ocfs2_extent_tree et;
3630
3631 mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, "
3632 "previous xattr blkno = %llu\n",
3633 (unsigned long long)OCFS2_I(inode)->ip_blkno,
3634 prev_cpos, prev_blkno);
3635
3636 ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
3637
3638 ret = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
3639 &data_ac, &meta_ac);
3640 if (ret) {
3641 mlog_errno(ret);
3642 goto leave;
3643 }
3644
3645 credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el,
3646 clusters_to_add);
3647 handle = ocfs2_start_trans(osb, credits);
3648 if (IS_ERR(handle)) {
3649 ret = PTR_ERR(handle);
3650 handle = NULL;
3651 mlog_errno(ret);
3652 goto leave;
3653 }
3654
3655 ret = ocfs2_journal_access(handle, inode, root_bh,
3656 OCFS2_JOURNAL_ACCESS_WRITE);
3657 if (ret < 0) {
3658 mlog_errno(ret);
3659 goto leave;
3660 }
3661
3662 ret = __ocfs2_claim_clusters(osb, handle, data_ac, 1,
3663 clusters_to_add, &bit_off, &num_bits);
3664 if (ret < 0) {
3665 if (ret != -ENOSPC)
3666 mlog_errno(ret);
3667 goto leave;
3668 }
3669
3670 BUG_ON(num_bits > clusters_to_add);
3671
3672 block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
3673 mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n",
3674 num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
3675
3676 if (prev_blkno + prev_clusters * bpc == block &&
3677 (prev_clusters + num_bits) << osb->s_clustersize_bits <=
3678 OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
3679 /*
3680 * If this cluster is contiguous with the old one and
3681 * adding this new cluster, we don't surpass the limit of
3682 * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
3683 * initialized and used like other buckets in the previous
3684 * cluster.
3685 * So add it as a contiguous one. The caller will handle
3686 * its init process.
3687 */
3688 v_start = prev_cpos + prev_clusters;
3689 *num_clusters = prev_clusters + num_bits;
3690 mlog(0, "Add contiguous %u clusters to previous extent rec.\n",
3691 num_bits);
3692 } else {
3693 ret = ocfs2_adjust_xattr_cross_cluster(inode,
3694 handle,
3695 first_bh,
3696 header_bh,
3697 block,
3698 prev_blkno,
3699 prev_clusters,
3700 &v_start,
3701 extend);
3702 if (ret) {
3703 mlog_errno(ret);
3704 goto leave;
3705 }
3706 }
3707
3708 if (handle->h_buffer_credits < credits) {
3709 /*
3710 * The journal has been restarted before, and don't
3711 * have enough space for the insertion, so extend it
3712 * here.
3713 */
3714 ret = ocfs2_extend_trans(handle, credits);
3715 if (ret) {
3716 mlog_errno(ret);
3717 goto leave;
3718 }
3719 }
3720 mlog(0, "Insert %u clusters at block %llu for xattr at %u\n",
3721 num_bits, block, v_start);
3722 ret = ocfs2_insert_extent(osb, handle, inode, &et, v_start, block,
3723 num_bits, 0, meta_ac);
3724 if (ret < 0) {
3725 mlog_errno(ret);
3726 goto leave;
3727 }
3728
3729 ret = ocfs2_journal_dirty(handle, root_bh);
3730 if (ret < 0) {
3731 mlog_errno(ret);
3732 goto leave;
3733 }
3734
3735 leave:
3736 if (handle)
3737 ocfs2_commit_trans(osb, handle);
3738 if (data_ac)
3739 ocfs2_free_alloc_context(data_ac);
3740 if (meta_ac)
3741 ocfs2_free_alloc_context(meta_ac);
3742
3743 return ret;
3744 }
3745
3746 /*
3747 * Extend a new xattr bucket and move xattrs to the end one by one until
3748 * We meet with start_bh. Only move half of the xattrs to the bucket after it.
3749 */
3750 static int ocfs2_extend_xattr_bucket(struct inode *inode,
3751 struct buffer_head *first_bh,
3752 struct buffer_head *start_bh,
3753 u32 num_clusters)
3754 {
3755 int ret, credits;
3756 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3757 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3758 u64 start_blk = start_bh->b_blocknr, end_blk;
3759 u32 num_buckets = num_clusters * ocfs2_xattr_buckets_per_cluster(osb);
3760 handle_t *handle;
3761 struct ocfs2_xattr_header *first_xh =
3762 (struct ocfs2_xattr_header *)first_bh->b_data;
3763 u16 bucket = le16_to_cpu(first_xh->xh_num_buckets);
3764
3765 mlog(0, "extend xattr bucket in %llu, xattr extend rec starting "
3766 "from %llu, len = %u\n", start_blk,
3767 (unsigned long long)first_bh->b_blocknr, num_clusters);
3768
3769 BUG_ON(bucket >= num_buckets);
3770
3771 end_blk = first_bh->b_blocknr + (bucket - 1) * blk_per_bucket;
3772
3773 /*
3774 * We will touch all the buckets after the start_bh(include it).
3775 * Add one more bucket and modify the first_bh.
3776 */
3777 credits = end_blk - start_blk + 2 * blk_per_bucket + 1;
3778 handle = ocfs2_start_trans(osb, credits);
3779 if (IS_ERR(handle)) {
3780 ret = PTR_ERR(handle);
3781 handle = NULL;
3782 mlog_errno(ret);
3783 goto out;
3784 }
3785
3786 ret = ocfs2_journal_access(handle, inode, first_bh,
3787 OCFS2_JOURNAL_ACCESS_WRITE);
3788 if (ret) {
3789 mlog_errno(ret);
3790 goto commit;
3791 }
3792
3793 while (end_blk != start_blk) {
3794 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
3795 end_blk + blk_per_bucket, 0);
3796 if (ret)
3797 goto commit;
3798 end_blk -= blk_per_bucket;
3799 }
3800
3801 /* Move half of the xattr in start_blk to the next bucket. */
3802 ret = ocfs2_half_xattr_bucket(inode, handle, start_blk,
3803 start_blk + blk_per_bucket, NULL, 0);
3804
3805 le16_add_cpu(&first_xh->xh_num_buckets, 1);
3806 ocfs2_journal_dirty(handle, first_bh);
3807
3808 commit:
3809 ocfs2_commit_trans(osb, handle);
3810 out:
3811 return ret;
3812 }
3813
3814 /*
3815 * Add new xattr bucket in an extent record and adjust the buckets accordingly.
3816 * xb_bh is the ocfs2_xattr_block.
3817 * We will move all the buckets starting from header_bh to the next place. As
3818 * for this one, half num of its xattrs will be moved to the next one.
3819 *
3820 * We will allocate a new cluster if current cluster is full and adjust
3821 * header_bh and first_bh if the insert place is moved to the new cluster.
3822 */
3823 static int ocfs2_add_new_xattr_bucket(struct inode *inode,
3824 struct buffer_head *xb_bh,
3825 struct buffer_head *header_bh)
3826 {
3827 struct ocfs2_xattr_header *first_xh = NULL;
3828 struct buffer_head *first_bh = NULL;
3829 struct ocfs2_xattr_block *xb =
3830 (struct ocfs2_xattr_block *)xb_bh->b_data;
3831 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3832 struct ocfs2_extent_list *el = &xb_root->xt_list;
3833 struct ocfs2_xattr_header *xh =
3834 (struct ocfs2_xattr_header *)header_bh->b_data;
3835 u32 name_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3836 struct super_block *sb = inode->i_sb;
3837 struct ocfs2_super *osb = OCFS2_SB(sb);
3838 int ret, num_buckets, extend = 1;
3839 u64 p_blkno;
3840 u32 e_cpos, num_clusters;
3841
3842 mlog(0, "Add new xattr bucket starting form %llu\n",
3843 (unsigned long long)header_bh->b_blocknr);
3844
3845 /*
3846 * Add refrence for header_bh here because it may be
3847 * changed in ocfs2_add_new_xattr_cluster and we need
3848 * to free it in the end.
3849 */
3850 get_bh(header_bh);
3851
3852 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
3853 &num_clusters, el);
3854 if (ret) {
3855 mlog_errno(ret);
3856 goto out;
3857 }
3858
3859 ret = ocfs2_read_block(inode, p_blkno, &first_bh);
3860 if (ret) {
3861 mlog_errno(ret);
3862 goto out;
3863 }
3864
3865 num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
3866 first_xh = (struct ocfs2_xattr_header *)first_bh->b_data;
3867
3868 if (num_buckets == le16_to_cpu(first_xh->xh_num_buckets)) {
3869 ret = ocfs2_add_new_xattr_cluster(inode,
3870 xb_bh,
3871 &first_bh,
3872 &header_bh,
3873 &num_clusters,
3874 e_cpos,
3875 p_blkno,
3876 &extend);
3877 if (ret) {
3878 mlog_errno(ret);
3879 goto out;
3880 }
3881 }
3882
3883 if (extend)
3884 ret = ocfs2_extend_xattr_bucket(inode,
3885 first_bh,
3886 header_bh,
3887 num_clusters);
3888 if (ret)
3889 mlog_errno(ret);
3890 out:
3891 brelse(first_bh);
3892 brelse(header_bh);
3893 return ret;
3894 }
3895
3896 static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode,
3897 struct ocfs2_xattr_bucket *bucket,
3898 int offs)
3899 {
3900 int block_off = offs >> inode->i_sb->s_blocksize_bits;
3901
3902 offs = offs % inode->i_sb->s_blocksize;
3903 return bucket->bhs[block_off]->b_data + offs;
3904 }
3905
3906 /*
3907 * Handle the normal xattr set, including replace, delete and new.
3908 *
3909 * Note: "local" indicates the real data's locality. So we can't
3910 * just its bucket locality by its length.
3911 */
3912 static void ocfs2_xattr_set_entry_normal(struct inode *inode,
3913 struct ocfs2_xattr_info *xi,
3914 struct ocfs2_xattr_search *xs,
3915 u32 name_hash,
3916 int local)
3917 {
3918 struct ocfs2_xattr_entry *last, *xe;
3919 int name_len = strlen(xi->name);
3920 struct ocfs2_xattr_header *xh = xs->header;
3921 u16 count = le16_to_cpu(xh->xh_count), start;
3922 size_t blocksize = inode->i_sb->s_blocksize;
3923 char *val;
3924 size_t offs, size, new_size;
3925
3926 last = &xh->xh_entries[count];
3927 if (!xs->not_found) {
3928 xe = xs->here;
3929 offs = le16_to_cpu(xe->xe_name_offset);
3930 if (ocfs2_xattr_is_local(xe))
3931 size = OCFS2_XATTR_SIZE(name_len) +
3932 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3933 else
3934 size = OCFS2_XATTR_SIZE(name_len) +
3935 OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
3936
3937 /*
3938 * If the new value will be stored outside, xi->value has been
3939 * initalized as an empty ocfs2_xattr_value_root, and the same
3940 * goes with xi->value_len, so we can set new_size safely here.
3941 * See ocfs2_xattr_set_in_bucket.
3942 */
3943 new_size = OCFS2_XATTR_SIZE(name_len) +
3944 OCFS2_XATTR_SIZE(xi->value_len);
3945
3946 le16_add_cpu(&xh->xh_name_value_len, -size);
3947 if (xi->value) {
3948 if (new_size > size)
3949 goto set_new_name_value;
3950
3951 /* Now replace the old value with new one. */
3952 if (local)
3953 xe->xe_value_size = cpu_to_le64(xi->value_len);
3954 else
3955 xe->xe_value_size = 0;
3956
3957 val = ocfs2_xattr_bucket_get_val(inode,
3958 &xs->bucket, offs);
3959 memset(val + OCFS2_XATTR_SIZE(name_len), 0,
3960 size - OCFS2_XATTR_SIZE(name_len));
3961 if (OCFS2_XATTR_SIZE(xi->value_len) > 0)
3962 memcpy(val + OCFS2_XATTR_SIZE(name_len),
3963 xi->value, xi->value_len);
3964
3965 le16_add_cpu(&xh->xh_name_value_len, new_size);
3966 ocfs2_xattr_set_local(xe, local);
3967 return;
3968 } else {
3969 /*
3970 * Remove the old entry if there is more than one.
3971 * We don't remove the last entry so that we can
3972 * use it to indicate the hash value of the empty
3973 * bucket.
3974 */
3975 last -= 1;
3976 le16_add_cpu(&xh->xh_count, -1);
3977 if (xh->xh_count) {
3978 memmove(xe, xe + 1,
3979 (void *)last - (void *)xe);
3980 memset(last, 0,
3981 sizeof(struct ocfs2_xattr_entry));
3982 } else
3983 xh->xh_free_start =
3984 cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
3985
3986 return;
3987 }
3988 } else {
3989 /* find a new entry for insert. */
3990 int low = 0, high = count - 1, tmp;
3991 struct ocfs2_xattr_entry *tmp_xe;
3992
3993 while (low <= high && count) {
3994 tmp = (low + high) / 2;
3995 tmp_xe = &xh->xh_entries[tmp];
3996
3997 if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
3998 low = tmp + 1;
3999 else if (name_hash <
4000 le32_to_cpu(tmp_xe->xe_name_hash))
4001 high = tmp - 1;
4002 else {
4003 low = tmp;
4004 break;
4005 }
4006 }
4007
4008 xe = &xh->xh_entries[low];
4009 if (low != count)
4010 memmove(xe + 1, xe, (void *)last - (void *)xe);
4011
4012 le16_add_cpu(&xh->xh_count, 1);
4013 memset(xe, 0, sizeof(struct ocfs2_xattr_entry));
4014 xe->xe_name_hash = cpu_to_le32(name_hash);
4015 xe->xe_name_len = name_len;
4016 ocfs2_xattr_set_type(xe, xi->name_index);
4017 }
4018
4019 set_new_name_value:
4020 /* Insert the new name+value. */
4021 size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len);
4022
4023 /*
4024 * We must make sure that the name/value pair
4025 * exists in the same block.
4026 */
4027 offs = le16_to_cpu(xh->xh_free_start);
4028 start = offs - size;
4029
4030 if (start >> inode->i_sb->s_blocksize_bits !=
4031 (offs - 1) >> inode->i_sb->s_blocksize_bits) {
4032 offs = offs - offs % blocksize;
4033 xh->xh_free_start = cpu_to_le16(offs);
4034 }
4035
4036 val = ocfs2_xattr_bucket_get_val(inode,
4037 &xs->bucket, offs - size);
4038 xe->xe_name_offset = cpu_to_le16(offs - size);
4039
4040 memset(val, 0, size);
4041 memcpy(val, xi->name, name_len);
4042 memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len);
4043
4044 xe->xe_value_size = cpu_to_le64(xi->value_len);
4045 ocfs2_xattr_set_local(xe, local);
4046 xs->here = xe;
4047 le16_add_cpu(&xh->xh_free_start, -size);
4048 le16_add_cpu(&xh->xh_name_value_len, size);
4049
4050 return;
4051 }
4052
4053 static int ocfs2_xattr_bucket_handle_journal(struct inode *inode,
4054 handle_t *handle,
4055 struct ocfs2_xattr_search *xs,
4056 struct buffer_head **bhs,
4057 u16 bh_num)
4058 {
4059 int ret = 0, off, block_off;
4060 struct ocfs2_xattr_entry *xe = xs->here;
4061
4062 /*
4063 * First calculate all the blocks we should journal_access
4064 * and journal_dirty. The first block should always be touched.
4065 */
4066 ret = ocfs2_journal_dirty(handle, bhs[0]);
4067 if (ret)
4068 mlog_errno(ret);
4069
4070 /* calc the data. */
4071 off = le16_to_cpu(xe->xe_name_offset);
4072 block_off = off >> inode->i_sb->s_blocksize_bits;
4073 ret = ocfs2_journal_dirty(handle, bhs[block_off]);
4074 if (ret)
4075 mlog_errno(ret);
4076
4077 return ret;
4078 }
4079
4080 /*
4081 * Set the xattr entry in the specified bucket.
4082 * The bucket is indicated by xs->bucket and it should have the enough
4083 * space for the xattr insertion.
4084 */
4085 static int ocfs2_xattr_set_entry_in_bucket(struct inode *inode,
4086 struct ocfs2_xattr_info *xi,
4087 struct ocfs2_xattr_search *xs,
4088 u32 name_hash,
4089 int local)
4090 {
4091 int i, ret;
4092 handle_t *handle = NULL;
4093 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4094 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4095
4096 mlog(0, "Set xattr entry len = %lu index = %d in bucket %llu\n",
4097 (unsigned long)xi->value_len, xi->name_index,
4098 (unsigned long long)xs->bucket.bhs[0]->b_blocknr);
4099
4100 if (!xs->bucket.bhs[1]) {
4101 ret = ocfs2_read_blocks(inode,
4102 xs->bucket.bhs[0]->b_blocknr + 1,
4103 blk_per_bucket - 1, &xs->bucket.bhs[1],
4104 OCFS2_BH_CACHED);
4105 if (ret) {
4106 mlog_errno(ret);
4107 goto out;
4108 }
4109 }
4110
4111 handle = ocfs2_start_trans(osb, blk_per_bucket);
4112 if (IS_ERR(handle)) {
4113 ret = PTR_ERR(handle);
4114 handle = NULL;
4115 mlog_errno(ret);
4116 goto out;
4117 }
4118
4119 for (i = 0; i < blk_per_bucket; i++) {
4120 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[i],
4121 OCFS2_JOURNAL_ACCESS_WRITE);
4122 if (ret < 0) {
4123 mlog_errno(ret);
4124 goto out;
4125 }
4126 }
4127
4128 ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash, local);
4129
4130 /*Only dirty the blocks we have touched in set xattr. */
4131 ret = ocfs2_xattr_bucket_handle_journal(inode, handle, xs,
4132 xs->bucket.bhs, blk_per_bucket);
4133 if (ret)
4134 mlog_errno(ret);
4135 out:
4136 ocfs2_commit_trans(osb, handle);
4137
4138 return ret;
4139 }
4140
4141 static int ocfs2_xattr_value_update_size(struct inode *inode,
4142 struct buffer_head *xe_bh,
4143 struct ocfs2_xattr_entry *xe,
4144 u64 new_size)
4145 {
4146 int ret;
4147 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4148 handle_t *handle = NULL;
4149
4150 handle = ocfs2_start_trans(osb, 1);
4151 if (handle == NULL) {
4152 ret = -ENOMEM;
4153 mlog_errno(ret);
4154 goto out;
4155 }
4156
4157 ret = ocfs2_journal_access(handle, inode, xe_bh,
4158 OCFS2_JOURNAL_ACCESS_WRITE);
4159 if (ret < 0) {
4160 mlog_errno(ret);
4161 goto out_commit;
4162 }
4163
4164 xe->xe_value_size = cpu_to_le64(new_size);
4165
4166 ret = ocfs2_journal_dirty(handle, xe_bh);
4167 if (ret < 0)
4168 mlog_errno(ret);
4169
4170 out_commit:
4171 ocfs2_commit_trans(osb, handle);
4172 out:
4173 return ret;
4174 }
4175
4176 /*
4177 * Truncate the specified xe_off entry in xattr bucket.
4178 * bucket is indicated by header_bh and len is the new length.
4179 * Both the ocfs2_xattr_value_root and the entry will be updated here.
4180 *
4181 * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
4182 */
4183 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
4184 struct buffer_head *header_bh,
4185 int xe_off,
4186 int len)
4187 {
4188 int ret, offset;
4189 u64 value_blk;
4190 struct buffer_head *value_bh = NULL;
4191 struct ocfs2_xattr_value_root *xv;
4192 struct ocfs2_xattr_entry *xe;
4193 struct ocfs2_xattr_header *xh =
4194 (struct ocfs2_xattr_header *)header_bh->b_data;
4195 size_t blocksize = inode->i_sb->s_blocksize;
4196
4197 xe = &xh->xh_entries[xe_off];
4198
4199 BUG_ON(!xe || ocfs2_xattr_is_local(xe));
4200
4201 offset = le16_to_cpu(xe->xe_name_offset) +
4202 OCFS2_XATTR_SIZE(xe->xe_name_len);
4203
4204 value_blk = offset / blocksize;
4205
4206 /* We don't allow ocfs2_xattr_value to be stored in different block. */
4207 BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
4208 value_blk += header_bh->b_blocknr;
4209
4210 ret = ocfs2_read_block(inode, value_blk, &value_bh);
4211 if (ret) {
4212 mlog_errno(ret);
4213 goto out;
4214 }
4215
4216 xv = (struct ocfs2_xattr_value_root *)
4217 (value_bh->b_data + offset % blocksize);
4218
4219 mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n",
4220 xe_off, (unsigned long long)header_bh->b_blocknr, len);
4221 ret = ocfs2_xattr_value_truncate(inode, value_bh, xv, len);
4222 if (ret) {
4223 mlog_errno(ret);
4224 goto out;
4225 }
4226
4227 ret = ocfs2_xattr_value_update_size(inode, header_bh, xe, len);
4228 if (ret) {
4229 mlog_errno(ret);
4230 goto out;
4231 }
4232
4233 out:
4234 brelse(value_bh);
4235 return ret;
4236 }
4237
4238 static int ocfs2_xattr_bucket_value_truncate_xs(struct inode *inode,
4239 struct ocfs2_xattr_search *xs,
4240 int len)
4241 {
4242 int ret, offset;
4243 struct ocfs2_xattr_entry *xe = xs->here;
4244 struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xs->base;
4245
4246 BUG_ON(!xs->bucket.bhs[0] || !xe || ocfs2_xattr_is_local(xe));
4247
4248 offset = xe - xh->xh_entries;
4249 ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket.bhs[0],
4250 offset, len);
4251 if (ret)
4252 mlog_errno(ret);
4253
4254 return ret;
4255 }
4256
4257 static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode,
4258 struct ocfs2_xattr_search *xs,
4259 char *val,
4260 int value_len)
4261 {
4262 int offset;
4263 struct ocfs2_xattr_value_root *xv;
4264 struct ocfs2_xattr_entry *xe = xs->here;
4265
4266 BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe));
4267
4268 offset = le16_to_cpu(xe->xe_name_offset) +
4269 OCFS2_XATTR_SIZE(xe->xe_name_len);
4270
4271 xv = (struct ocfs2_xattr_value_root *)(xs->base + offset);
4272
4273 return __ocfs2_xattr_set_value_outside(inode, xv, val, value_len);
4274 }
4275
4276 static int ocfs2_rm_xattr_cluster(struct inode *inode,
4277 struct buffer_head *root_bh,
4278 u64 blkno,
4279 u32 cpos,
4280 u32 len)
4281 {
4282 int ret;
4283 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4284 struct inode *tl_inode = osb->osb_tl_inode;
4285 handle_t *handle;
4286 struct ocfs2_xattr_block *xb =
4287 (struct ocfs2_xattr_block *)root_bh->b_data;
4288 struct ocfs2_alloc_context *meta_ac = NULL;
4289 struct ocfs2_cached_dealloc_ctxt dealloc;
4290 struct ocfs2_extent_tree et;
4291
4292 ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
4293
4294 ocfs2_init_dealloc_ctxt(&dealloc);
4295
4296 mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n",
4297 cpos, len, (unsigned long long)blkno);
4298
4299 ocfs2_remove_xattr_clusters_from_cache(inode, blkno, len);
4300
4301 ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
4302 if (ret) {
4303 mlog_errno(ret);
4304 return ret;
4305 }
4306
4307 mutex_lock(&tl_inode->i_mutex);
4308
4309 if (ocfs2_truncate_log_needs_flush(osb)) {
4310 ret = __ocfs2_flush_truncate_log(osb);
4311 if (ret < 0) {
4312 mlog_errno(ret);
4313 goto out;
4314 }
4315 }
4316
4317 handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
4318 if (handle == NULL) {
4319 ret = -ENOMEM;
4320 mlog_errno(ret);
4321 goto out;
4322 }
4323
4324 ret = ocfs2_journal_access(handle, inode, root_bh,
4325 OCFS2_JOURNAL_ACCESS_WRITE);
4326 if (ret) {
4327 mlog_errno(ret);
4328 goto out_commit;
4329 }
4330
4331 ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
4332 &dealloc);
4333 if (ret) {
4334 mlog_errno(ret);
4335 goto out_commit;
4336 }
4337
4338 le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
4339
4340 ret = ocfs2_journal_dirty(handle, root_bh);
4341 if (ret) {
4342 mlog_errno(ret);
4343 goto out_commit;
4344 }
4345
4346 ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
4347 if (ret)
4348 mlog_errno(ret);
4349
4350 out_commit:
4351 ocfs2_commit_trans(osb, handle);
4352 out:
4353 ocfs2_schedule_truncate_log_flush(osb, 1);
4354
4355 mutex_unlock(&tl_inode->i_mutex);
4356
4357 if (meta_ac)
4358 ocfs2_free_alloc_context(meta_ac);
4359
4360 ocfs2_run_deallocs(osb, &dealloc);
4361
4362 return ret;
4363 }
4364
4365 static void ocfs2_xattr_bucket_remove_xs(struct inode *inode,
4366 struct ocfs2_xattr_search *xs)
4367 {
4368 handle_t *handle = NULL;
4369 struct ocfs2_xattr_header *xh = xs->bucket.xh;
4370 struct ocfs2_xattr_entry *last = &xh->xh_entries[
4371 le16_to_cpu(xh->xh_count) - 1];
4372 int ret = 0;
4373
4374 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1);
4375 if (IS_ERR(handle)) {
4376 ret = PTR_ERR(handle);
4377 mlog_errno(ret);
4378 return;
4379 }
4380
4381 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[0],
4382 OCFS2_JOURNAL_ACCESS_WRITE);
4383 if (ret) {
4384 mlog_errno(ret);
4385 goto out_commit;
4386 }
4387
4388 /* Remove the old entry. */
4389 memmove(xs->here, xs->here + 1,
4390 (void *)last - (void *)xs->here);
4391 memset(last, 0, sizeof(struct ocfs2_xattr_entry));
4392 le16_add_cpu(&xh->xh_count, -1);
4393
4394 ret = ocfs2_journal_dirty(handle, xs->bucket.bhs[0]);
4395 if (ret < 0)
4396 mlog_errno(ret);
4397 out_commit:
4398 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
4399 }
4400
4401 /*
4402 * Set the xattr name/value in the bucket specified in xs.
4403 *
4404 * As the new value in xi may be stored in the bucket or in an outside cluster,
4405 * we divide the whole process into 3 steps:
4406 * 1. insert name/value in the bucket(ocfs2_xattr_set_entry_in_bucket)
4407 * 2. truncate of the outside cluster(ocfs2_xattr_bucket_value_truncate_xs)
4408 * 3. Set the value to the outside cluster(ocfs2_xattr_bucket_set_value_outside)
4409 * 4. If the clusters for the new outside value can't be allocated, we need
4410 * to free the xattr we allocated in set.
4411 */
4412 static int ocfs2_xattr_set_in_bucket(struct inode *inode,
4413 struct ocfs2_xattr_info *xi,
4414 struct ocfs2_xattr_search *xs)
4415 {
4416 int ret, local = 1;
4417 size_t value_len;
4418 char *val = (char *)xi->value;
4419 struct ocfs2_xattr_entry *xe = xs->here;
4420 u32 name_hash = ocfs2_xattr_name_hash(inode, xi->name,
4421 strlen(xi->name));
4422
4423 if (!xs->not_found && !ocfs2_xattr_is_local(xe)) {
4424 /*
4425 * We need to truncate the xattr storage first.
4426 *
4427 * If both the old and new value are stored to
4428 * outside block, we only need to truncate
4429 * the storage and then set the value outside.
4430 *
4431 * If the new value should be stored within block,
4432 * we should free all the outside block first and
4433 * the modification to the xattr block will be done
4434 * by following steps.
4435 */
4436 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
4437 value_len = xi->value_len;
4438 else
4439 value_len = 0;
4440
4441 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
4442 value_len);
4443 if (ret)
4444 goto out;
4445
4446 if (value_len)
4447 goto set_value_outside;
4448 }
4449
4450 value_len = xi->value_len;
4451 /* So we have to handle the inside block change now. */
4452 if (value_len > OCFS2_XATTR_INLINE_SIZE) {
4453 /*
4454 * If the new value will be stored outside of block,
4455 * initalize a new empty value root and insert it first.
4456 */
4457 local = 0;
4458 xi->value = &def_xv;
4459 xi->value_len = OCFS2_XATTR_ROOT_SIZE;
4460 }
4461
4462 ret = ocfs2_xattr_set_entry_in_bucket(inode, xi, xs, name_hash, local);
4463 if (ret) {
4464 mlog_errno(ret);
4465 goto out;
4466 }
4467
4468 if (value_len <= OCFS2_XATTR_INLINE_SIZE)
4469 goto out;
4470
4471 /* allocate the space now for the outside block storage. */
4472 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
4473 value_len);
4474 if (ret) {
4475 mlog_errno(ret);
4476
4477 if (xs->not_found) {
4478 /*
4479 * We can't allocate enough clusters for outside
4480 * storage and we have allocated xattr already,
4481 * so need to remove it.
4482 */
4483 ocfs2_xattr_bucket_remove_xs(inode, xs);
4484 }
4485 goto out;
4486 }
4487
4488 set_value_outside:
4489 ret = ocfs2_xattr_bucket_set_value_outside(inode, xs, val, value_len);
4490 out:
4491 return ret;
4492 }
4493
4494 /* check whether the xattr bucket is filled up with the same hash value. */
4495 static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
4496 struct ocfs2_xattr_bucket *bucket)
4497 {
4498 struct ocfs2_xattr_header *xh = bucket->xh;
4499
4500 if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
4501 xh->xh_entries[0].xe_name_hash) {
4502 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
4503 "hash = %u\n",
4504 (unsigned long long)bucket->bhs[0]->b_blocknr,
4505 le32_to_cpu(xh->xh_entries[0].xe_name_hash));
4506 return -ENOSPC;
4507 }
4508
4509 return 0;
4510 }
4511
4512 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
4513 struct ocfs2_xattr_info *xi,
4514 struct ocfs2_xattr_search *xs)
4515 {
4516 struct ocfs2_xattr_header *xh;
4517 struct ocfs2_xattr_entry *xe;
4518 u16 count, header_size, xh_free_start;
4519 int i, free, max_free, need, old;
4520 size_t value_size = 0, name_len = strlen(xi->name);
4521 size_t blocksize = inode->i_sb->s_blocksize;
4522 int ret, allocation = 0;
4523 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4524
4525 mlog_entry("Set xattr %s in xattr index block\n", xi->name);
4526
4527 try_again:
4528 xh = xs->header;
4529 count = le16_to_cpu(xh->xh_count);
4530 xh_free_start = le16_to_cpu(xh->xh_free_start);
4531 header_size = sizeof(struct ocfs2_xattr_header) +
4532 count * sizeof(struct ocfs2_xattr_entry);
4533 max_free = OCFS2_XATTR_BUCKET_SIZE -
4534 le16_to_cpu(xh->xh_name_value_len) - header_size;
4535
4536 mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size "
4537 "of %u which exceed block size\n",
4538 (unsigned long long)xs->bucket.bhs[0]->b_blocknr,
4539 header_size);
4540
4541 if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE)
4542 value_size = OCFS2_XATTR_ROOT_SIZE;
4543 else if (xi->value)
4544 value_size = OCFS2_XATTR_SIZE(xi->value_len);
4545
4546 if (xs->not_found)
4547 need = sizeof(struct ocfs2_xattr_entry) +
4548 OCFS2_XATTR_SIZE(name_len) + value_size;
4549 else {
4550 need = value_size + OCFS2_XATTR_SIZE(name_len);
4551
4552 /*
4553 * We only replace the old value if the new length is smaller
4554 * than the old one. Otherwise we will allocate new space in the
4555 * bucket to store it.
4556 */
4557 xe = xs->here;
4558 if (ocfs2_xattr_is_local(xe))
4559 old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
4560 else
4561 old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
4562
4563 if (old >= value_size)
4564 need = 0;
4565 }
4566
4567 free = xh_free_start - header_size;
4568 /*
4569 * We need to make sure the new name/value pair
4570 * can exist in the same block.
4571 */
4572 if (xh_free_start % blocksize < need)
4573 free -= xh_free_start % blocksize;
4574
4575 mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, "
4576 "need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len ="
4577 " %u\n", xs->not_found,
4578 (unsigned long long)xs->bucket.bhs[0]->b_blocknr,
4579 free, need, max_free, le16_to_cpu(xh->xh_free_start),
4580 le16_to_cpu(xh->xh_name_value_len));
4581
4582 if (free < need || count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
4583 if (need <= max_free &&
4584 count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
4585 /*
4586 * We can create the space by defragment. Since only the
4587 * name/value will be moved, the xe shouldn't be changed
4588 * in xs.
4589 */
4590 ret = ocfs2_defrag_xattr_bucket(inode, &xs->bucket);
4591 if (ret) {
4592 mlog_errno(ret);
4593 goto out;
4594 }
4595
4596 xh_free_start = le16_to_cpu(xh->xh_free_start);
4597 free = xh_free_start - header_size;
4598 if (xh_free_start % blocksize < need)
4599 free -= xh_free_start % blocksize;
4600
4601 if (free >= need)
4602 goto xattr_set;
4603
4604 mlog(0, "Can't get enough space for xattr insert by "
4605 "defragment. Need %u bytes, but we have %d, so "
4606 "allocate new bucket for it.\n", need, free);
4607 }
4608
4609 /*
4610 * We have to add new buckets or clusters and one
4611 * allocation should leave us enough space for insert.
4612 */
4613 BUG_ON(allocation);
4614
4615 /*
4616 * We do not allow for overlapping ranges between buckets. And
4617 * the maximum number of collisions we will allow for then is
4618 * one bucket's worth, so check it here whether we need to
4619 * add a new bucket for the insert.
4620 */
4621 ret = ocfs2_check_xattr_bucket_collision(inode, &xs->bucket);
4622 if (ret) {
4623 mlog_errno(ret);
4624 goto out;
4625 }
4626
4627 ret = ocfs2_add_new_xattr_bucket(inode,
4628 xs->xattr_bh,
4629 xs->bucket.bhs[0]);
4630 if (ret) {
4631 mlog_errno(ret);
4632 goto out;
4633 }
4634
4635 for (i = 0; i < blk_per_bucket; i++)
4636 brelse(xs->bucket.bhs[i]);
4637
4638 memset(&xs->bucket, 0, sizeof(xs->bucket));
4639
4640 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
4641 xi->name_index,
4642 xi->name, xs);
4643 if (ret && ret != -ENODATA)
4644 goto out;
4645 xs->not_found = ret;
4646 allocation = 1;
4647 goto try_again;
4648 }
4649
4650 xattr_set:
4651 ret = ocfs2_xattr_set_in_bucket(inode, xi, xs);
4652 out:
4653 mlog_exit(ret);
4654 return ret;
4655 }
4656
4657 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
4658 struct ocfs2_xattr_bucket *bucket,
4659 void *para)
4660 {
4661 int ret = 0;
4662 struct ocfs2_xattr_header *xh = bucket->xh;
4663 u16 i;
4664 struct ocfs2_xattr_entry *xe;
4665
4666 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
4667 xe = &xh->xh_entries[i];
4668 if (ocfs2_xattr_is_local(xe))
4669 continue;
4670
4671 ret = ocfs2_xattr_bucket_value_truncate(inode,
4672 bucket->bhs[0],
4673 i, 0);
4674 if (ret) {
4675 mlog_errno(ret);
4676 break;
4677 }
4678 }
4679
4680 return ret;
4681 }
4682
4683 static int ocfs2_delete_xattr_index_block(struct inode *inode,
4684 struct buffer_head *xb_bh)
4685 {
4686 struct ocfs2_xattr_block *xb =
4687 (struct ocfs2_xattr_block *)xb_bh->b_data;
4688 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
4689 int ret = 0;
4690 u32 name_hash = UINT_MAX, e_cpos, num_clusters;
4691 u64 p_blkno;
4692
4693 if (le16_to_cpu(el->l_next_free_rec) == 0)
4694 return 0;
4695
4696 while (name_hash > 0) {
4697 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
4698 &e_cpos, &num_clusters, el);
4699 if (ret) {
4700 mlog_errno(ret);
4701 goto out;
4702 }
4703
4704 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
4705 ocfs2_delete_xattr_in_bucket,
4706 NULL);
4707 if (ret) {
4708 mlog_errno(ret);
4709 goto out;
4710 }
4711
4712 ret = ocfs2_rm_xattr_cluster(inode, xb_bh,
4713 p_blkno, e_cpos, num_clusters);
4714 if (ret) {
4715 mlog_errno(ret);
4716 break;
4717 }
4718
4719 if (e_cpos == 0)
4720 break;
4721
4722 name_hash = e_cpos - 1;
4723 }
4724
4725 out:
4726 return ret;
4727 }
4728
4729 /*
4730 * 'trusted' attributes support
4731 */
4732
4733 #define XATTR_TRUSTED_PREFIX "trusted."
4734
4735 static size_t ocfs2_xattr_trusted_list(struct inode *inode, char *list,
4736 size_t list_size, const char *name,
4737 size_t name_len)
4738 {
4739 const size_t prefix_len = sizeof(XATTR_TRUSTED_PREFIX) - 1;
4740 const size_t total_len = prefix_len + name_len + 1;
4741
4742 if (list && total_len <= list_size) {
4743 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
4744 memcpy(list + prefix_len, name, name_len);
4745 list[prefix_len + name_len] = '\0';
4746 }
4747 return total_len;
4748 }
4749
4750 static int ocfs2_xattr_trusted_get(struct inode *inode, const char *name,
4751 void *buffer, size_t size)
4752 {
4753 if (strcmp(name, "") == 0)
4754 return -EINVAL;
4755 return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_TRUSTED, name,
4756 buffer, size);
4757 }
4758
4759 static int ocfs2_xattr_trusted_set(struct inode *inode, const char *name,
4760 const void *value, size_t size, int flags)
4761 {
4762 if (strcmp(name, "") == 0)
4763 return -EINVAL;
4764
4765 return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_TRUSTED, name, value,
4766 size, flags);
4767 }
4768
4769 struct xattr_handler ocfs2_xattr_trusted_handler = {
4770 .prefix = XATTR_TRUSTED_PREFIX,
4771 .list = ocfs2_xattr_trusted_list,
4772 .get = ocfs2_xattr_trusted_get,
4773 .set = ocfs2_xattr_trusted_set,
4774 };
4775
4776
4777 /*
4778 * 'user' attributes support
4779 */
4780
4781 #define XATTR_USER_PREFIX "user."
4782
4783 static size_t ocfs2_xattr_user_list(struct inode *inode, char *list,
4784 size_t list_size, const char *name,
4785 size_t name_len)
4786 {
4787 const size_t prefix_len = sizeof(XATTR_USER_PREFIX) - 1;
4788 const size_t total_len = prefix_len + name_len + 1;
4789 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4790
4791 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
4792 return 0;
4793
4794 if (list && total_len <= list_size) {
4795 memcpy(list, XATTR_USER_PREFIX, prefix_len);
4796 memcpy(list + prefix_len, name, name_len);
4797 list[prefix_len + name_len] = '\0';
4798 }
4799 return total_len;
4800 }
4801
4802 static int ocfs2_xattr_user_get(struct inode *inode, const char *name,
4803 void *buffer, size_t size)
4804 {
4805 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4806
4807 if (strcmp(name, "") == 0)
4808 return -EINVAL;
4809 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
4810 return -EOPNOTSUPP;
4811 return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_USER, name,
4812 buffer, size);
4813 }
4814
4815 static int ocfs2_xattr_user_set(struct inode *inode, const char *name,
4816 const void *value, size_t size, int flags)
4817 {
4818 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4819
4820 if (strcmp(name, "") == 0)
4821 return -EINVAL;
4822 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
4823 return -EOPNOTSUPP;
4824
4825 return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_USER, name, value,
4826 size, flags);
4827 }
4828
4829 struct xattr_handler ocfs2_xattr_user_handler = {
4830 .prefix = XATTR_USER_PREFIX,
4831 .list = ocfs2_xattr_user_list,
4832 .get = ocfs2_xattr_user_get,
4833 .set = ocfs2_xattr_user_set,
4834 };
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree