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ocfs2: Delete all xattr buckets during inode removal
[deliverable/linux.git] / fs / ocfs2 / xattr.c
CommitLineData
f56654c4
TM		 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 *
cf1d6c76
TY		 8 * CREDITS:
9 * Lots of code in this file is taken from ext3.
10 *
f56654c4
TM		 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
cf1d6c76
TY		 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>
01225596 39#include <linux/sort.h>
cf1d6c76 40
f56654c4
TM		 41#define MLOG_MASK_PREFIX ML_XATTR
42#include <cluster/masklog.h>
43
44#include "ocfs2.h"
45#include "alloc.h"
46#include "dlmglue.h"
47#include "file.h"
cf1d6c76
TY		 48#include "symlink.h"
49#include "sysfile.h"
f56654c4
TM		 50#include "inode.h"
51#include "journal.h"
52#include "ocfs2_fs.h"
53#include "suballoc.h"
54#include "uptodate.h"
55#include "buffer_head_io.h"
0c044f0b 56#include "super.h"
cf1d6c76
TY		 57#include "xattr.h"
58
59
60struct ocfs2_xattr_def_value_root {
61 struct ocfs2_xattr_value_root xv;
62 struct ocfs2_extent_rec er;
63};
64
0c044f0b
TM		 65struct ocfs2_xattr_bucket {
66 struct buffer_head *bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET];
67 struct ocfs2_xattr_header *xh;
68};
69
cf1d6c76
TY		 70#define OCFS2_XATTR_ROOT_SIZE (sizeof(struct ocfs2_xattr_def_value_root))
71#define OCFS2_XATTR_INLINE_SIZE 80
72
73static struct ocfs2_xattr_def_value_root def_xv = {
74 .xv.xr_list.l_count = cpu_to_le16(1),
75};
76
77struct xattr_handler *ocfs2_xattr_handlers[] = {
78 &ocfs2_xattr_user_handler,
79 &ocfs2_xattr_trusted_handler,
80 NULL
81};
82
83static struct xattr_handler *ocfs2_xattr_handler_map[] = {
84 [OCFS2_XATTR_INDEX_USER] = &ocfs2_xattr_user_handler,
85 [OCFS2_XATTR_INDEX_TRUSTED] = &ocfs2_xattr_trusted_handler,
86};
87
88struct ocfs2_xattr_info {
89 int name_index;
90 const char *name;
91 const void *value;
92 size_t value_len;
93};
94
95struct ocfs2_xattr_search {
96 struct buffer_head *inode_bh;
97 /*
98 * xattr_bh point to the block buffer head which has extended attribute
99 * when extended attribute in inode, xattr_bh is equal to inode_bh.
100 */
101 struct buffer_head *xattr_bh;
102 struct ocfs2_xattr_header *header;
589dc260 103 struct ocfs2_xattr_bucket bucket;
cf1d6c76
TY		 104 void *base;
105 void *end;
106 struct ocfs2_xattr_entry *here;
107 int not_found;
108};
109
589dc260
TM		 110static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
111 struct ocfs2_xattr_header *xh,
112 int index,
113 int *block_off,
114 int *new_offset);
115
116static int ocfs2_xattr_index_block_find(struct inode *inode,
117 struct buffer_head *root_bh,
118 int name_index,
119 const char *name,
120 struct ocfs2_xattr_search *xs);
121
0c044f0b
TM		 122static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
123 struct ocfs2_xattr_tree_root *xt,
124 char *buffer,
125 size_t buffer_size);
126
01225596
TM		 127static int ocfs2_xattr_create_index_block(struct inode *inode,
128 struct ocfs2_xattr_search *xs);
129
130static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
131 struct ocfs2_xattr_info *xi,
132 struct ocfs2_xattr_search *xs);
133
a3944256
TM		 134static int ocfs2_delete_xattr_index_block(struct inode *inode,
135 struct buffer_head *xb_bh);
136
cf1d6c76
TY		 137static inline struct xattr_handler *ocfs2_xattr_handler(int name_index)
138{
139 struct xattr_handler *handler = NULL;
140
141 if (name_index > 0 && name_index < OCFS2_XATTR_MAX)
142 handler = ocfs2_xattr_handler_map[name_index];
143
144 return handler;
145}
146
147static inline u32 ocfs2_xattr_name_hash(struct inode *inode,
148 char *prefix,
149 int prefix_len,
150 char *name,
151 int name_len)
152{
153 /* Get hash value of uuid from super block */
154 u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash;
155 int i;
156
157 /* hash extended attribute prefix */
158 for (i = 0; i < prefix_len; i++) {
159 hash = (hash << OCFS2_HASH_SHIFT) ^
160 (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
161 *prefix++;
162 }
163 /* hash extended attribute name */
164 for (i = 0; i < name_len; i++) {
165 hash = (hash << OCFS2_HASH_SHIFT) ^
166 (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
167 *name++;
168 }
169
170 return hash;
171}
172
173/*
174 * ocfs2_xattr_hash_entry()
175 *
176 * Compute the hash of an extended attribute.
177 */
178static void ocfs2_xattr_hash_entry(struct inode *inode,
179 struct ocfs2_xattr_header *header,
180 struct ocfs2_xattr_entry *entry)
181{
182 u32 hash = 0;
183 struct xattr_handler *handler =
184 ocfs2_xattr_handler(ocfs2_xattr_get_type(entry));
185 char *prefix = handler->prefix;
186 char *name = (char *)header + le16_to_cpu(entry->xe_name_offset);
187 int prefix_len = strlen(handler->prefix);
188
189 hash = ocfs2_xattr_name_hash(inode, prefix, prefix_len, name,
190 entry->xe_name_len);
191 entry->xe_name_hash = cpu_to_le32(hash);
192
193 return;
194}
f56654c4
TM		 195
196static int ocfs2_xattr_extend_allocation(struct inode *inode,
197 u32 clusters_to_add,
198 struct buffer_head *xattr_bh,
199 struct ocfs2_xattr_value_root *xv)
200{
201 int status = 0;
202 int restart_func = 0;
203 int credits = 0;
204 handle_t *handle = NULL;
205 struct ocfs2_alloc_context *data_ac = NULL;
206 struct ocfs2_alloc_context *meta_ac = NULL;
207 enum ocfs2_alloc_restarted why;
208 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
209 struct ocfs2_extent_list *root_el = &xv->xr_list;
210 u32 prev_clusters, logical_start = le32_to_cpu(xv->xr_clusters);
211
212 mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add);
213
214restart_all:
215
216 status = ocfs2_lock_allocators(inode, xattr_bh, root_el,
217 clusters_to_add, 0, &data_ac,
218 &meta_ac, OCFS2_XATTR_VALUE_EXTENT, xv);
219 if (status) {
220 mlog_errno(status);
221 goto leave;
222 }
223
224 credits = ocfs2_calc_extend_credits(osb->sb, root_el, clusters_to_add);
225 handle = ocfs2_start_trans(osb, credits);
226 if (IS_ERR(handle)) {
227 status = PTR_ERR(handle);
228 handle = NULL;
229 mlog_errno(status);
230 goto leave;
231 }
232
233restarted_transaction:
234 status = ocfs2_journal_access(handle, inode, xattr_bh,
235 OCFS2_JOURNAL_ACCESS_WRITE);
236 if (status < 0) {
237 mlog_errno(status);
238 goto leave;
239 }
240
241 prev_clusters = le32_to_cpu(xv->xr_clusters);
242 status = ocfs2_add_clusters_in_btree(osb,
243 inode,
244 &logical_start,
245 clusters_to_add,
246 0,
247 xattr_bh,
248 root_el,
249 handle,
250 data_ac,
251 meta_ac,
252 &why,
253 OCFS2_XATTR_VALUE_EXTENT,
254 xv);
255 if ((status < 0) && (status != -EAGAIN)) {
256 if (status != -ENOSPC)
257 mlog_errno(status);
258 goto leave;
259 }
260
261 status = ocfs2_journal_dirty(handle, xattr_bh);
262 if (status < 0) {
263 mlog_errno(status);
264 goto leave;
265 }
266
267 clusters_to_add -= le32_to_cpu(xv->xr_clusters) - prev_clusters;
268
269 if (why != RESTART_NONE && clusters_to_add) {
270 if (why == RESTART_META) {
271 mlog(0, "restarting function.\n");
272 restart_func = 1;
273 } else {
274 BUG_ON(why != RESTART_TRANS);
275
276 mlog(0, "restarting transaction.\n");
277 /* TODO: This can be more intelligent. */
278 credits = ocfs2_calc_extend_credits(osb->sb,
279 root_el,
280 clusters_to_add);
281 status = ocfs2_extend_trans(handle, credits);
282 if (status < 0) {
283 /* handle still has to be committed at
284 * this point. */
285 status = -ENOMEM;
286 mlog_errno(status);
287 goto leave;
288 }
289 goto restarted_transaction;
290 }
291 }
292
293leave:
294 if (handle) {
295 ocfs2_commit_trans(osb, handle);
296 handle = NULL;
297 }
298 if (data_ac) {
299 ocfs2_free_alloc_context(data_ac);
300 data_ac = NULL;
301 }
302 if (meta_ac) {
303 ocfs2_free_alloc_context(meta_ac);
304 meta_ac = NULL;
305 }
306 if ((!status) && restart_func) {
307 restart_func = 0;
308 goto restart_all;
309 }
310
311 return status;
312}
313
314static int __ocfs2_remove_xattr_range(struct inode *inode,
315 struct buffer_head *root_bh,
316 struct ocfs2_xattr_value_root *xv,
317 u32 cpos, u32 phys_cpos, u32 len,
318 struct ocfs2_cached_dealloc_ctxt *dealloc)
319{
320 int ret;
321 u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
322 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
323 struct inode *tl_inode = osb->osb_tl_inode;
324 handle_t *handle;
325 struct ocfs2_alloc_context *meta_ac = NULL;
326
327 ret = ocfs2_lock_allocators(inode, root_bh, &xv->xr_list,
328 0, 1, NULL, &meta_ac,
329 OCFS2_XATTR_VALUE_EXTENT, xv);
330 if (ret) {
331 mlog_errno(ret);
332 return ret;
333 }
334
335 mutex_lock(&tl_inode->i_mutex);
336
337 if (ocfs2_truncate_log_needs_flush(osb)) {
338 ret = __ocfs2_flush_truncate_log(osb);
339 if (ret < 0) {
340 mlog_errno(ret);
341 goto out;
342 }
343 }
344
345 handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
346 if (IS_ERR(handle)) {
347 ret = PTR_ERR(handle);
348 mlog_errno(ret);
349 goto out;
350 }
351
352 ret = ocfs2_journal_access(handle, inode, root_bh,
353 OCFS2_JOURNAL_ACCESS_WRITE);
354 if (ret) {
355 mlog_errno(ret);
356 goto out_commit;
357 }
358
359 ret = ocfs2_remove_extent(inode, root_bh, cpos, len, handle, meta_ac,
360 dealloc, OCFS2_XATTR_VALUE_EXTENT, xv);
361 if (ret) {
362 mlog_errno(ret);
363 goto out_commit;
364 }
365
366 le32_add_cpu(&xv->xr_clusters, -len);
367
368 ret = ocfs2_journal_dirty(handle, root_bh);
369 if (ret) {
370 mlog_errno(ret);
371 goto out_commit;
372 }
373
374 ret = ocfs2_truncate_log_append(osb, handle, phys_blkno, len);
375 if (ret)
376 mlog_errno(ret);
377
378out_commit:
379 ocfs2_commit_trans(osb, handle);
380out:
381 mutex_unlock(&tl_inode->i_mutex);
382
383 if (meta_ac)
384 ocfs2_free_alloc_context(meta_ac);
385
386 return ret;
387}
388
389static int ocfs2_xattr_shrink_size(struct inode *inode,
390 u32 old_clusters,
391 u32 new_clusters,
392 struct buffer_head *root_bh,
393 struct ocfs2_xattr_value_root *xv)
394{
395 int ret = 0;
396 u32 trunc_len, cpos, phys_cpos, alloc_size;
397 u64 block;
398 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
399 struct ocfs2_cached_dealloc_ctxt dealloc;
400
401 ocfs2_init_dealloc_ctxt(&dealloc);
402
403 if (old_clusters <= new_clusters)
404 return 0;
405
406 cpos = new_clusters;
407 trunc_len = old_clusters - new_clusters;
408 while (trunc_len) {
409 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
410 &alloc_size, &xv->xr_list);
411 if (ret) {
412 mlog_errno(ret);
413 goto out;
414 }
415
416 if (alloc_size > trunc_len)
417 alloc_size = trunc_len;
418
419 ret = __ocfs2_remove_xattr_range(inode, root_bh, xv, cpos,
420 phys_cpos, alloc_size,
421 &dealloc);
422 if (ret) {
423 mlog_errno(ret);
424 goto out;
425 }
426
427 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
428 ocfs2_remove_xattr_clusters_from_cache(inode, block,
429 alloc_size);
430 cpos += alloc_size;
431 trunc_len -= alloc_size;
432 }
433
434out:
435 ocfs2_schedule_truncate_log_flush(osb, 1);
436 ocfs2_run_deallocs(osb, &dealloc);
437
438 return ret;
439}
440
441static int ocfs2_xattr_value_truncate(struct inode *inode,
442 struct buffer_head *root_bh,
443 struct ocfs2_xattr_value_root *xv,
444 int len)
445{
446 int ret;
447 u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
448 u32 old_clusters = le32_to_cpu(xv->xr_clusters);
449
450 if (new_clusters == old_clusters)
451 return 0;
452
453 if (new_clusters > old_clusters)
454 ret = ocfs2_xattr_extend_allocation(inode,
455 new_clusters - old_clusters,
456 root_bh, xv);
457 else
458 ret = ocfs2_xattr_shrink_size(inode,
459 old_clusters, new_clusters,
460 root_bh, xv);
461
462 return ret;
463}
cf1d6c76
TY		 464
465static int ocfs2_xattr_list_entries(struct inode *inode,
466 struct ocfs2_xattr_header *header,
467 char *buffer, size_t buffer_size)
468{
469 size_t rest = buffer_size;
470 int i;
471
472 for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
473 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
474 struct xattr_handler *handler =
475 ocfs2_xattr_handler(ocfs2_xattr_get_type(entry));
476
477 if (handler) {
478 size_t size = handler->list(inode, buffer, rest,
479 ((char *)header +
480 le16_to_cpu(entry->xe_name_offset)),
481 entry->xe_name_len);
482 if (buffer) {
483 if (size > rest)
484 return -ERANGE;
485 buffer += size;
486 }
487 rest -= size;
488 }
489 }
490
491 return buffer_size - rest;
492}
493
494static int ocfs2_xattr_ibody_list(struct inode *inode,
495 struct ocfs2_dinode *di,
496 char *buffer,
497 size_t buffer_size)
498{
499 struct ocfs2_xattr_header *header = NULL;
500 struct ocfs2_inode_info *oi = OCFS2_I(inode);
501 int ret = 0;
502
503 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
504 return ret;
505
506 header = (struct ocfs2_xattr_header *)
507 ((void *)di + inode->i_sb->s_blocksize -
508 le16_to_cpu(di->i_xattr_inline_size));
509
510 ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size);
511
512 return ret;
513}
514
515static int ocfs2_xattr_block_list(struct inode *inode,
516 struct ocfs2_dinode *di,
517 char *buffer,
518 size_t buffer_size)
519{
520 struct buffer_head *blk_bh = NULL;
0c044f0b 521 struct ocfs2_xattr_block *xb;
cf1d6c76
TY		 522 int ret = 0;
523
524 if (!di->i_xattr_loc)
525 return ret;
526
527 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
528 le64_to_cpu(di->i_xattr_loc),
529 &blk_bh, OCFS2_BH_CACHED, inode);
530 if (ret < 0) {
531 mlog_errno(ret);
532 return ret;
533 }
534 /*Verify the signature of xattr block*/
535 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
536 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
537 ret = -EFAULT;
538 goto cleanup;
539 }
540
0c044f0b 541 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
cf1d6c76 542
0c044f0b
TM		 543 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
544 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
545 ret = ocfs2_xattr_list_entries(inode, header,
546 buffer, buffer_size);
547 } else {
548 struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root;
549 ret = ocfs2_xattr_tree_list_index_block(inode, xt,
550 buffer, buffer_size);
551 }
cf1d6c76
TY		 552cleanup:
553 brelse(blk_bh);
554
555 return ret;
556}
557
558ssize_t ocfs2_listxattr(struct dentry *dentry,
559 char *buffer,
560 size_t size)
561{
562 int ret = 0, i_ret = 0, b_ret = 0;
563 struct buffer_head *di_bh = NULL;
564 struct ocfs2_dinode *di = NULL;
565 struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode);
566
567 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
568 return ret;
569
570 ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0);
571 if (ret < 0) {
572 mlog_errno(ret);
573 return ret;
574 }
575
576 di = (struct ocfs2_dinode *)di_bh->b_data;
577
578 down_read(&oi->ip_xattr_sem);
579 i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size);
580 if (i_ret < 0)
581 b_ret = 0;
582 else {
583 if (buffer) {
584 buffer += i_ret;
585 size -= i_ret;
586 }
587 b_ret = ocfs2_xattr_block_list(dentry->d_inode, di,
588 buffer, size);
589 if (b_ret < 0)
590 i_ret = 0;
591 }
592 up_read(&oi->ip_xattr_sem);
593 ocfs2_inode_unlock(dentry->d_inode, 0);
594
595 brelse(di_bh);
596
597 return i_ret + b_ret;
598}
599
600static int ocfs2_xattr_find_entry(int name_index,
601 const char *name,
602 struct ocfs2_xattr_search *xs)
603{
604 struct ocfs2_xattr_entry *entry;
605 size_t name_len;
606 int i, cmp = 1;
607
608 if (name == NULL)
609 return -EINVAL;
610
611 name_len = strlen(name);
612 entry = xs->here;
613 for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
614 cmp = name_index - ocfs2_xattr_get_type(entry);
615 if (!cmp)
616 cmp = name_len - entry->xe_name_len;
617 if (!cmp)
618 cmp = memcmp(name, (xs->base +
619 le16_to_cpu(entry->xe_name_offset)),
620 name_len);
621 if (cmp == 0)
622 break;
623 entry += 1;
624 }
625 xs->here = entry;
626
627 return cmp ? -ENODATA : 0;
628}
629
630static int ocfs2_xattr_get_value_outside(struct inode *inode,
589dc260 631 struct ocfs2_xattr_value_root *xv,
cf1d6c76
TY		 632 void *buffer,
633 size_t len)
634{
635 u32 cpos, p_cluster, num_clusters, bpc, clusters;
636 u64 blkno;
637 int i, ret = 0;
638 size_t cplen, blocksize;
639 struct buffer_head *bh = NULL;
cf1d6c76
TY		 640 struct ocfs2_extent_list *el;
641
cf1d6c76
TY		 642 el = &xv->xr_list;
643 clusters = le32_to_cpu(xv->xr_clusters);
644 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
645 blocksize = inode->i_sb->s_blocksize;
646
647 cpos = 0;
648 while (cpos < clusters) {
649 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
650 &num_clusters, el);
651 if (ret) {
652 mlog_errno(ret);
653 goto out;
654 }
655
656 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
657 /* Copy ocfs2_xattr_value */
658 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
659 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno,
660 &bh, OCFS2_BH_CACHED, inode);
661 if (ret) {
662 mlog_errno(ret);
663 goto out;
664 }
665
666 cplen = len >= blocksize ? blocksize : len;
667 memcpy(buffer, bh->b_data, cplen);
668 len -= cplen;
669 buffer += cplen;
670
671 brelse(bh);
672 bh = NULL;
673 if (len == 0)
674 break;
675 }
676 cpos += num_clusters;
677 }
678out:
679 return ret;
680}
681
682static int ocfs2_xattr_ibody_get(struct inode *inode,
683 int name_index,
684 const char *name,
685 void *buffer,
686 size_t buffer_size,
687 struct ocfs2_xattr_search *xs)
688{
689 struct ocfs2_inode_info *oi = OCFS2_I(inode);
690 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
589dc260 691 struct ocfs2_xattr_value_root *xv;
cf1d6c76
TY		 692 size_t size;
693 int ret = 0;
694
695 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
696 return -ENODATA;
697
698 xs->end = (void *)di + inode->i_sb->s_blocksize;
699 xs->header = (struct ocfs2_xattr_header *)
700 (xs->end - le16_to_cpu(di->i_xattr_inline_size));
701 xs->base = (void *)xs->header;
702 xs->here = xs->header->xh_entries;
703
704 ret = ocfs2_xattr_find_entry(name_index, name, xs);
705 if (ret)
706 return ret;
707 size = le64_to_cpu(xs->here->xe_value_size);
708 if (buffer) {
709 if (size > buffer_size)
710 return -ERANGE;
711 if (ocfs2_xattr_is_local(xs->here)) {
712 memcpy(buffer, (void *)xs->base +
713 le16_to_cpu(xs->here->xe_name_offset) +
714 OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
715 } else {
589dc260
TM		 716 xv = (struct ocfs2_xattr_value_root *)
717 (xs->base + le16_to_cpu(
718 xs->here->xe_name_offset) +
719 OCFS2_XATTR_SIZE(xs->here->xe_name_len));
720 ret = ocfs2_xattr_get_value_outside(inode, xv,
cf1d6c76
TY		 721 buffer, size);
722 if (ret < 0) {
723 mlog_errno(ret);
724 return ret;
725 }
726 }
727 }
728
729 return size;
730}
731
732static int ocfs2_xattr_block_get(struct inode *inode,
733 int name_index,
734 const char *name,
735 void *buffer,
736 size_t buffer_size,
737 struct ocfs2_xattr_search *xs)
738{
739 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
740 struct buffer_head *blk_bh = NULL;
741 struct ocfs2_xattr_block *xb;
589dc260 742 struct ocfs2_xattr_value_root *xv;
cf1d6c76 743 size_t size;
589dc260 744 int ret = -ENODATA, name_offset, name_len, block_off, i;
cf1d6c76
TY		 745
746 if (!di->i_xattr_loc)
747 return ret;
748
589dc260
TM		 749 memset(&xs->bucket, 0, sizeof(xs->bucket));
750
cf1d6c76
TY		 751 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
752 le64_to_cpu(di->i_xattr_loc),
753 &blk_bh, OCFS2_BH_CACHED, inode);
754 if (ret < 0) {
755 mlog_errno(ret);
756 return ret;
757 }
758 /*Verify the signature of xattr block*/
759 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
760 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
761 ret = -EFAULT;
762 goto cleanup;
763 }
764
765 xs->xattr_bh = blk_bh;
766 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
cf1d6c76 767
589dc260
TM		 768 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
769 xs->header = &xb->xb_attrs.xb_header;
770 xs->base = (void *)xs->header;
771 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
772 xs->here = xs->header->xh_entries;
773
774 ret = ocfs2_xattr_find_entry(name_index, name, xs);
775 } else
776 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
777 name_index,
778 name, xs);
779
cf1d6c76
TY		 780 if (ret)
781 goto cleanup;
782 size = le64_to_cpu(xs->here->xe_value_size);
783 if (buffer) {
784 ret = -ERANGE;
785 if (size > buffer_size)
786 goto cleanup;
589dc260
TM		 787
788 name_offset = le16_to_cpu(xs->here->xe_name_offset);
789 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
790 i = xs->here - xs->header->xh_entries;
791
792 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
793 ret = ocfs2_xattr_bucket_get_name_value(inode,
794 xs->bucket.xh,
795 i,
796 &block_off,
797 &name_offset);
798 xs->base = xs->bucket.bhs[block_off]->b_data;
799 }
cf1d6c76
TY		 800 if (ocfs2_xattr_is_local(xs->here)) {
801 memcpy(buffer, (void *)xs->base +
589dc260 802 name_offset + name_len, size);
cf1d6c76 803 } else {
589dc260
TM		 804 xv = (struct ocfs2_xattr_value_root *)
805 (xs->base + name_offset + name_len);
806 ret = ocfs2_xattr_get_value_outside(inode, xv,
cf1d6c76
TY		 807 buffer, size);
808 if (ret < 0) {
809 mlog_errno(ret);
810 goto cleanup;
811 }
812 }
813 }
814 ret = size;
815cleanup:
589dc260
TM		 816 for (i = 0; i < OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET; i++)
817 brelse(xs->bucket.bhs[i]);
818 memset(&xs->bucket, 0, sizeof(xs->bucket));
cf1d6c76 819
589dc260 820 brelse(blk_bh);
cf1d6c76
TY		 821 return ret;
822}
823
824/* ocfs2_xattr_get()
825 *
826 * Copy an extended attribute into the buffer provided.
827 * Buffer is NULL to compute the size of buffer required.
828 */
829int ocfs2_xattr_get(struct inode *inode,
830 int name_index,
831 const char *name,
832 void *buffer,
833 size_t buffer_size)
834{
835 int ret;
836 struct ocfs2_dinode *di = NULL;
837 struct buffer_head *di_bh = NULL;
838 struct ocfs2_inode_info *oi = OCFS2_I(inode);
839 struct ocfs2_xattr_search xis = {
840 .not_found = -ENODATA,
841 };
842 struct ocfs2_xattr_search xbs = {
843 .not_found = -ENODATA,
844 };
845
846 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
847 ret = -ENODATA;
848
849 ret = ocfs2_inode_lock(inode, &di_bh, 0);
850 if (ret < 0) {
851 mlog_errno(ret);
852 return ret;
853 }
854 xis.inode_bh = xbs.inode_bh = di_bh;
855 di = (struct ocfs2_dinode *)di_bh->b_data;
856
857 down_read(&oi->ip_xattr_sem);
858 ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
859 buffer_size, &xis);
860 if (ret == -ENODATA)
861 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
862 buffer_size, &xbs);
863 up_read(&oi->ip_xattr_sem);
864 ocfs2_inode_unlock(inode, 0);
865
866 brelse(di_bh);
867
868 return ret;
869}
870
871static int __ocfs2_xattr_set_value_outside(struct inode *inode,
872 struct ocfs2_xattr_value_root *xv,
873 const void *value,
874 int value_len)
875{
876 int ret = 0, i, cp_len, credits;
877 u16 blocksize = inode->i_sb->s_blocksize;
878 u32 p_cluster, num_clusters;
879 u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
880 u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
881 u64 blkno;
882 struct buffer_head *bh = NULL;
883 handle_t *handle;
884
885 BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
886
887 credits = clusters * bpc;
888 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), credits);
889 if (IS_ERR(handle)) {
890 ret = PTR_ERR(handle);
891 mlog_errno(ret);
892 goto out;
893 }
894
895 while (cpos < clusters) {
896 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
897 &num_clusters, &xv->xr_list);
898 if (ret) {
899 mlog_errno(ret);
900 goto out_commit;
901 }
902
903 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
904
905 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
906 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno,
907 &bh, OCFS2_BH_CACHED, inode);
908 if (ret) {
909 mlog_errno(ret);
910 goto out_commit;
911 }
912
913 ret = ocfs2_journal_access(handle,
914 inode,
915 bh,
916 OCFS2_JOURNAL_ACCESS_WRITE);
917 if (ret < 0) {
918 mlog_errno(ret);
919 goto out_commit;
920 }
921
922 cp_len = value_len > blocksize ? blocksize : value_len;
923 memcpy(bh->b_data, value, cp_len);
924 value_len -= cp_len;
925 value += cp_len;
926 if (cp_len < blocksize)
927 memset(bh->b_data + cp_len, 0,
928 blocksize - cp_len);
929
930 ret = ocfs2_journal_dirty(handle, bh);
931 if (ret < 0) {
932 mlog_errno(ret);
933 goto out_commit;
934 }
935 brelse(bh);
936 bh = NULL;
937
938 /*
939 * XXX: do we need to empty all the following
940 * blocks in this cluster?
941 */
942 if (!value_len)
943 break;
944 }
945 cpos += num_clusters;
946 }
947out_commit:
948 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
949out:
950 brelse(bh);
951
952 return ret;
953}
954
955static int ocfs2_xattr_cleanup(struct inode *inode,
956 struct ocfs2_xattr_info *xi,
957 struct ocfs2_xattr_search *xs,
958 size_t offs)
959{
960 handle_t *handle = NULL;
961 int ret = 0;
962 size_t name_len = strlen(xi->name);
963 void *val = xs->base + offs;
964 size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
965
966 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
967 OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
968 if (IS_ERR(handle)) {
969 ret = PTR_ERR(handle);
970 mlog_errno(ret);
971 goto out;
972 }
973 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
974 OCFS2_JOURNAL_ACCESS_WRITE);
975 if (ret) {
976 mlog_errno(ret);
977 goto out_commit;
978 }
979 /* Decrease xattr count */
980 le16_add_cpu(&xs->header->xh_count, -1);
981 /* Remove the xattr entry and tree root which has already be set*/
982 memset((void *)xs->here, 0, sizeof(struct ocfs2_xattr_entry));
983 memset(val, 0, size);
984
985 ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
986 if (ret < 0)
987 mlog_errno(ret);
988out_commit:
989 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
990out:
991 return ret;
992}
993
994static int ocfs2_xattr_update_entry(struct inode *inode,
995 struct ocfs2_xattr_info *xi,
996 struct ocfs2_xattr_search *xs,
997 size_t offs)
998{
999 handle_t *handle = NULL;
1000 int ret = 0;
1001
1002 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1003 OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
1004 if (IS_ERR(handle)) {
1005 ret = PTR_ERR(handle);
1006 mlog_errno(ret);
1007 goto out;
1008 }
1009 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1010 OCFS2_JOURNAL_ACCESS_WRITE);
1011 if (ret) {
1012 mlog_errno(ret);
1013 goto out_commit;
1014 }
1015
1016 xs->here->xe_name_offset = cpu_to_le16(offs);
1017 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1018 if (xi->value_len <= OCFS2_XATTR_INLINE_SIZE)
1019 ocfs2_xattr_set_local(xs->here, 1);
1020 else
1021 ocfs2_xattr_set_local(xs->here, 0);
1022 ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1023
1024 ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
1025 if (ret < 0)
1026 mlog_errno(ret);
1027out_commit:
1028 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1029out:
1030 return ret;
1031}
1032
1033/*
1034 * ocfs2_xattr_set_value_outside()
1035 *
1036 * Set large size value in B tree.
1037 */
1038static int ocfs2_xattr_set_value_outside(struct inode *inode,
1039 struct ocfs2_xattr_info *xi,
1040 struct ocfs2_xattr_search *xs,
1041 size_t offs)
1042{
1043 size_t name_len = strlen(xi->name);
1044 void *val = xs->base + offs;
1045 struct ocfs2_xattr_value_root *xv = NULL;
1046 size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1047 int ret = 0;
1048
1049 memset(val, 0, size);
1050 memcpy(val, xi->name, name_len);
1051 xv = (struct ocfs2_xattr_value_root *)
1052 (val + OCFS2_XATTR_SIZE(name_len));
1053 xv->xr_clusters = 0;
1054 xv->xr_last_eb_blk = 0;
1055 xv->xr_list.l_tree_depth = 0;
1056 xv->xr_list.l_count = cpu_to_le16(1);
1057 xv->xr_list.l_next_free_rec = 0;
1058
1059 ret = ocfs2_xattr_value_truncate(inode, xs->xattr_bh, xv,
1060 xi->value_len);
1061 if (ret < 0) {
1062 mlog_errno(ret);
1063 return ret;
1064 }
1065 ret = __ocfs2_xattr_set_value_outside(inode, xv, xi->value,
1066 xi->value_len);
1067 if (ret < 0) {
1068 mlog_errno(ret);
1069 return ret;
1070 }
1071 ret = ocfs2_xattr_update_entry(inode, xi, xs, offs);
1072 if (ret < 0)
1073 mlog_errno(ret);
1074
1075 return ret;
1076}
1077
1078/*
1079 * ocfs2_xattr_set_entry_local()
1080 *
1081 * Set, replace or remove extended attribute in local.
1082 */
1083static void ocfs2_xattr_set_entry_local(struct inode *inode,
1084 struct ocfs2_xattr_info *xi,
1085 struct ocfs2_xattr_search *xs,
1086 struct ocfs2_xattr_entry *last,
1087 size_t min_offs)
1088{
1089 size_t name_len = strlen(xi->name);
1090 int i;
1091
1092 if (xi->value && xs->not_found) {
1093 /* Insert the new xattr entry. */
1094 le16_add_cpu(&xs->header->xh_count, 1);
1095 ocfs2_xattr_set_type(last, xi->name_index);
1096 ocfs2_xattr_set_local(last, 1);
1097 last->xe_name_len = name_len;
1098 } else {
1099 void *first_val;
1100 void *val;
1101 size_t offs, size;
1102
1103 first_val = xs->base + min_offs;
1104 offs = le16_to_cpu(xs->here->xe_name_offset);
1105 val = xs->base + offs;
1106
1107 if (le64_to_cpu(xs->here->xe_value_size) >
1108 OCFS2_XATTR_INLINE_SIZE)
1109 size = OCFS2_XATTR_SIZE(name_len) +
1110 OCFS2_XATTR_ROOT_SIZE;
1111 else
1112 size = OCFS2_XATTR_SIZE(name_len) +
1113 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1114
1115 if (xi->value && size == OCFS2_XATTR_SIZE(name_len) +
1116 OCFS2_XATTR_SIZE(xi->value_len)) {
1117 /* The old and the new value have the
1118 same size. Just replace the value. */
1119 ocfs2_xattr_set_local(xs->here, 1);
1120 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1121 /* Clear value bytes. */
1122 memset(val + OCFS2_XATTR_SIZE(name_len),
1123 0,
1124 OCFS2_XATTR_SIZE(xi->value_len));
1125 memcpy(val + OCFS2_XATTR_SIZE(name_len),
1126 xi->value,
1127 xi->value_len);
1128 return;
1129 }
1130 /* Remove the old name+value. */
1131 memmove(first_val + size, first_val, val - first_val);
1132 memset(first_val, 0, size);
1133 xs->here->xe_name_hash = 0;
1134 xs->here->xe_name_offset = 0;
1135 ocfs2_xattr_set_local(xs->here, 1);
1136 xs->here->xe_value_size = 0;
1137
1138 min_offs += size;
1139
1140 /* Adjust all value offsets. */
1141 last = xs->header->xh_entries;
1142 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1143 size_t o = le16_to_cpu(last->xe_name_offset);
1144
1145 if (o < offs)
1146 last->xe_name_offset = cpu_to_le16(o + size);
1147 last += 1;
1148 }
1149
1150 if (!xi->value) {
1151 /* Remove the old entry. */
1152 last -= 1;
1153 memmove(xs->here, xs->here + 1,
1154 (void *)last - (void *)xs->here);
1155 memset(last, 0, sizeof(struct ocfs2_xattr_entry));
1156 le16_add_cpu(&xs->header->xh_count, -1);
1157 }
1158 }
1159 if (xi->value) {
1160 /* Insert the new name+value. */
1161 size_t size = OCFS2_XATTR_SIZE(name_len) +
1162 OCFS2_XATTR_SIZE(xi->value_len);
1163 void *val = xs->base + min_offs - size;
1164
1165 xs->here->xe_name_offset = cpu_to_le16(min_offs - size);
1166 memset(val, 0, size);
1167 memcpy(val, xi->name, name_len);
1168 memcpy(val + OCFS2_XATTR_SIZE(name_len),
1169 xi->value,
1170 xi->value_len);
1171 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1172 ocfs2_xattr_set_local(xs->here, 1);
1173 ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1174 }
1175
1176 return;
1177}
1178
1179/*
1180 * ocfs2_xattr_set_entry()
1181 *
1182 * Set extended attribute entry into inode or block.
1183 *
1184 * If extended attribute value size > OCFS2_XATTR_INLINE_SIZE,
1185 * We first insert tree root(ocfs2_xattr_value_root) with set_entry_local(),
1186 * then set value in B tree with set_value_outside().
1187 */
1188static int ocfs2_xattr_set_entry(struct inode *inode,
1189 struct ocfs2_xattr_info *xi,
1190 struct ocfs2_xattr_search *xs,
1191 int flag)
1192{
1193 struct ocfs2_xattr_entry *last;
1194 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1195 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1196 size_t min_offs = xs->end - xs->base, name_len = strlen(xi->name);
1197 size_t size_l = 0;
1198 handle_t *handle = NULL;
1199 int free, i, ret;
1200 struct ocfs2_xattr_info xi_l = {
1201 .name_index = xi->name_index,
1202 .name = xi->name,
1203 .value = xi->value,
1204 .value_len = xi->value_len,
1205 };
1206
1207 /* Compute min_offs, last and free space. */
1208 last = xs->header->xh_entries;
1209
1210 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1211 size_t offs = le16_to_cpu(last->xe_name_offset);
1212 if (offs < min_offs)
1213 min_offs = offs;
1214 last += 1;
1215 }
1216
1217 free = min_offs - ((void *)last - xs->base) - sizeof(__u32);
1218 if (free < 0)
1219 return -EFAULT;
1220
1221 if (!xs->not_found) {
1222 size_t size = 0;
1223 if (ocfs2_xattr_is_local(xs->here))
1224 size = OCFS2_XATTR_SIZE(name_len) +
1225 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1226 else
1227 size = OCFS2_XATTR_SIZE(name_len) +
1228 OCFS2_XATTR_ROOT_SIZE;
1229 free += (size + sizeof(struct ocfs2_xattr_entry));
1230 }
1231 /* Check free space in inode or block */
1232 if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1233 if (free < sizeof(struct ocfs2_xattr_entry) +
1234 OCFS2_XATTR_SIZE(name_len) +
1235 OCFS2_XATTR_ROOT_SIZE) {
1236 ret = -ENOSPC;
1237 goto out;
1238 }
1239 size_l = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1240 xi_l.value = (void *)&def_xv;
1241 xi_l.value_len = OCFS2_XATTR_ROOT_SIZE;
1242 } else if (xi->value) {
1243 if (free < sizeof(struct ocfs2_xattr_entry) +
1244 OCFS2_XATTR_SIZE(name_len) +
1245 OCFS2_XATTR_SIZE(xi->value_len)) {
1246 ret = -ENOSPC;
1247 goto out;
1248 }
1249 }
1250
1251 if (!xs->not_found) {
1252 /* For existing extended attribute */
1253 size_t size = OCFS2_XATTR_SIZE(name_len) +
1254 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1255 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1256 void *val = xs->base + offs;
1257
1258 if (ocfs2_xattr_is_local(xs->here) && size == size_l) {
1259 /* Replace existing local xattr with tree root */
1260 ret = ocfs2_xattr_set_value_outside(inode, xi, xs,
1261 offs);
1262 if (ret < 0)
1263 mlog_errno(ret);
1264 goto out;
1265 } else if (!ocfs2_xattr_is_local(xs->here)) {
1266 /* For existing xattr which has value outside */
1267 struct ocfs2_xattr_value_root *xv = NULL;
1268 xv = (struct ocfs2_xattr_value_root *)(val +
1269 OCFS2_XATTR_SIZE(name_len));
1270
1271 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1272 /*
1273 * If new value need set outside also,
1274 * first truncate old value to new value,
1275 * then set new value with set_value_outside().
1276 */
1277 ret = ocfs2_xattr_value_truncate(inode,
1278 xs->xattr_bh,
1279 xv,
1280 xi->value_len);
1281 if (ret < 0) {
1282 mlog_errno(ret);
1283 goto out;
1284 }
1285
1286 ret = __ocfs2_xattr_set_value_outside(inode,
1287 xv,
1288 xi->value,
1289 xi->value_len);
1290 if (ret < 0) {
1291 mlog_errno(ret);
1292 goto out;
1293 }
1294
1295 ret = ocfs2_xattr_update_entry(inode,
1296 xi,
1297 xs,
1298 offs);
1299 if (ret < 0)
1300 mlog_errno(ret);
1301 goto out;
1302 } else {
1303 /*
1304 * If new value need set in local,
1305 * just trucate old value to zero.
1306 */
1307 ret = ocfs2_xattr_value_truncate(inode,
1308 xs->xattr_bh,
1309 xv,
1310 0);
1311 if (ret < 0)
1312 mlog_errno(ret);
1313 }
1314 }
1315 }
1316
1317 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1318 OCFS2_INODE_UPDATE_CREDITS);
1319 if (IS_ERR(handle)) {
1320 ret = PTR_ERR(handle);
1321 mlog_errno(ret);
1322 goto out;
1323 }
1324
1325 ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
1326 OCFS2_JOURNAL_ACCESS_WRITE);
1327 if (ret) {
1328 mlog_errno(ret);
1329 goto out_commit;
1330 }
1331
1332 if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1333 /*set extended attribue in external blcok*/
1334 ret = ocfs2_extend_trans(handle,
1335 OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
1336 if (ret) {
1337 mlog_errno(ret);
1338 goto out_commit;
1339 }
1340 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1341 OCFS2_JOURNAL_ACCESS_WRITE);
1342 if (ret) {
1343 mlog_errno(ret);
1344 goto out_commit;
1345 }
1346 }
1347
1348 /*
1349 * Set value in local, include set tree root in local.
1350 * This is the first step for value size >INLINE_SIZE.
1351 */
1352 ocfs2_xattr_set_entry_local(inode, &xi_l, xs, last, min_offs);
1353
1354 if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1355 ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
1356 if (ret < 0) {
1357 mlog_errno(ret);
1358 goto out_commit;
1359 }
1360 }
1361
1362 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) &&
1363 (flag & OCFS2_INLINE_XATTR_FL)) {
1364 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1365 unsigned int xattrsize = osb->s_xattr_inline_size;
1366
1367 /*
1368 * Adjust extent record count or inline data size
1369 * to reserve space for extended attribute.
1370 */
1371 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1372 struct ocfs2_inline_data *idata = &di->id2.i_data;
1373 le16_add_cpu(&idata->id_count, -xattrsize);
1374 } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
1375 struct ocfs2_extent_list *el = &di->id2.i_list;
1376 le16_add_cpu(&el->l_count, -(xattrsize /
1377 sizeof(struct ocfs2_extent_rec)));
1378 }
1379 di->i_xattr_inline_size = cpu_to_le16(xattrsize);
1380 }
1381 /* Update xattr flag */
1382 spin_lock(&oi->ip_lock);
1383 oi->ip_dyn_features |= flag;
1384 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1385 spin_unlock(&oi->ip_lock);
1386 /* Update inode ctime */
1387 inode->i_ctime = CURRENT_TIME;
1388 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
1389 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
1390
1391 ret = ocfs2_journal_dirty(handle, xs->inode_bh);
1392 if (ret < 0)
1393 mlog_errno(ret);
1394
1395out_commit:
1396 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1397
1398 if (!ret && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1399 /*
1400 * Set value outside in B tree.
1401 * This is the second step for value size > INLINE_SIZE.
1402 */
1403 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1404 ret = ocfs2_xattr_set_value_outside(inode, xi, xs, offs);
1405 if (ret < 0) {
1406 int ret2;
1407
1408 mlog_errno(ret);
1409 /*
1410 * If set value outside failed, we have to clean
1411 * the junk tree root we have already set in local.
1412 */
1413 ret2 = ocfs2_xattr_cleanup(inode, xi, xs, offs);
1414 if (ret2 < 0)
1415 mlog_errno(ret2);
1416 }
1417 }
1418out:
1419 return ret;
1420
1421}
1422
1423static int ocfs2_xattr_free_block(handle_t *handle,
1424 struct ocfs2_super *osb,
1425 struct ocfs2_xattr_block *xb)
1426{
1427 struct inode *xb_alloc_inode;
1428 struct buffer_head *xb_alloc_bh = NULL;
1429 u64 blk = le64_to_cpu(xb->xb_blkno);
1430 u16 bit = le16_to_cpu(xb->xb_suballoc_bit);
1431 u64 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
1432 int ret = 0;
1433
1434 xb_alloc_inode = ocfs2_get_system_file_inode(osb,
1435 EXTENT_ALLOC_SYSTEM_INODE,
1436 le16_to_cpu(xb->xb_suballoc_slot));
1437 if (!xb_alloc_inode) {
1438 ret = -ENOMEM;
1439 mlog_errno(ret);
1440 goto out;
1441 }
1442 mutex_lock(&xb_alloc_inode->i_mutex);
1443
1444 ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
1445 if (ret < 0) {
1446 mlog_errno(ret);
1447 goto out_mutex;
1448 }
1449 ret = ocfs2_extend_trans(handle, OCFS2_SUBALLOC_FREE);
1450 if (ret < 0) {
1451 mlog_errno(ret);
1452 goto out_unlock;
1453 }
1454 ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
1455 bit, bg_blkno, 1);
1456 if (ret < 0)
1457 mlog_errno(ret);
1458out_unlock:
1459 ocfs2_inode_unlock(xb_alloc_inode, 1);
1460 brelse(xb_alloc_bh);
1461out_mutex:
1462 mutex_unlock(&xb_alloc_inode->i_mutex);
1463 iput(xb_alloc_inode);
1464out:
1465 return ret;
1466}
1467
1468static int ocfs2_remove_value_outside(struct inode*inode,
1469 struct buffer_head *bh,
1470 struct ocfs2_xattr_header *header)
1471{
1472 int ret = 0, i;
1473
1474 for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
1475 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
1476
1477 if (!ocfs2_xattr_is_local(entry)) {
1478 struct ocfs2_xattr_value_root *xv;
1479 void *val;
1480
1481 val = (void *)header +
1482 le16_to_cpu(entry->xe_name_offset);
1483 xv = (struct ocfs2_xattr_value_root *)
1484 (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
1485 ret = ocfs2_xattr_value_truncate(inode, bh, xv, 0);
1486 if (ret < 0) {
1487 mlog_errno(ret);
1488 return ret;
1489 }
1490 }
1491 }
1492
1493 return ret;
1494}
1495
1496static int ocfs2_xattr_ibody_remove(struct inode *inode,
1497 struct buffer_head *di_bh)
1498{
1499
1500 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1501 struct ocfs2_xattr_header *header;
1502 int ret;
1503
1504 header = (struct ocfs2_xattr_header *)
1505 ((void *)di + inode->i_sb->s_blocksize -
1506 le16_to_cpu(di->i_xattr_inline_size));
1507
1508 ret = ocfs2_remove_value_outside(inode, di_bh, header);
1509
1510 return ret;
1511}
1512
1513static int ocfs2_xattr_block_remove(struct inode *inode,
1514 struct buffer_head *blk_bh)
1515{
1516 struct ocfs2_xattr_block *xb;
cf1d6c76
TY		 1517 int ret = 0;
1518
1519 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
a3944256
TM		 1520 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
1521 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
1522 ret = ocfs2_remove_value_outside(inode, blk_bh, header);
1523 } else
1524 ret = ocfs2_delete_xattr_index_block(inode, blk_bh);
cf1d6c76
TY		 1525
1526 return ret;
1527}
1528
1529/*
1530 * ocfs2_xattr_remove()
1531 *
1532 * Free extended attribute resources associated with this inode.
1533 */
1534int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
1535{
1536 struct ocfs2_xattr_block *xb;
1537 struct buffer_head *blk_bh = NULL;
1538 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1539 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1540 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1541 handle_t *handle;
1542 int ret;
1543
1544 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1545 return 0;
1546
1547 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
1548 ret = ocfs2_xattr_ibody_remove(inode, di_bh);
1549 if (ret < 0) {
1550 mlog_errno(ret);
1551 goto out;
1552 }
1553 }
1554 if (di->i_xattr_loc) {
1555 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
1556 le64_to_cpu(di->i_xattr_loc),
1557 &blk_bh, OCFS2_BH_CACHED, inode);
1558 if (ret < 0) {
1559 mlog_errno(ret);
1560 return ret;
1561 }
1562 /*Verify the signature of xattr block*/
1563 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
1564 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
1565 ret = -EFAULT;
1566 goto out;
1567 }
1568
1569 ret = ocfs2_xattr_block_remove(inode, blk_bh);
1570 if (ret < 0) {
1571 mlog_errno(ret);
1572 goto out;
1573 }
1574 }
1575
1576 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1577 OCFS2_INODE_UPDATE_CREDITS);
1578 if (IS_ERR(handle)) {
1579 ret = PTR_ERR(handle);
1580 mlog_errno(ret);
1581 goto out;
1582 }
1583 ret = ocfs2_journal_access(handle, inode, di_bh,
1584 OCFS2_JOURNAL_ACCESS_WRITE);
1585 if (ret) {
1586 mlog_errno(ret);
1587 goto out_commit;
1588 }
1589
1590 if (di->i_xattr_loc) {
1591 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1592 ocfs2_xattr_free_block(handle, osb, xb);
1593 di->i_xattr_loc = cpu_to_le64(0);
1594 }
1595
1596 spin_lock(&oi->ip_lock);
1597 oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
1598 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1599 spin_unlock(&oi->ip_lock);
1600
1601 ret = ocfs2_journal_dirty(handle, di_bh);
1602 if (ret < 0)
1603 mlog_errno(ret);
1604out_commit:
1605 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1606out:
1607 brelse(blk_bh);
1608
1609 return ret;
1610}
1611
1612static int ocfs2_xattr_has_space_inline(struct inode *inode,
1613 struct ocfs2_dinode *di)
1614{
1615 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1616 unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
1617 int free;
1618
1619 if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
1620 return 0;
1621
1622 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1623 struct ocfs2_inline_data *idata = &di->id2.i_data;
1624 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
1625 } else if (ocfs2_inode_is_fast_symlink(inode)) {
1626 free = ocfs2_fast_symlink_chars(inode->i_sb) -
1627 le64_to_cpu(di->i_size);
1628 } else {
1629 struct ocfs2_extent_list *el = &di->id2.i_list;
1630 free = (le16_to_cpu(el->l_count) -
1631 le16_to_cpu(el->l_next_free_rec)) *
1632 sizeof(struct ocfs2_extent_rec);
1633 }
1634 if (free >= xattrsize)
1635 return 1;
1636
1637 return 0;
1638}
1639
1640/*
1641 * ocfs2_xattr_ibody_find()
1642 *
1643 * Find extended attribute in inode block and
1644 * fill search info into struct ocfs2_xattr_search.
1645 */
1646static int ocfs2_xattr_ibody_find(struct inode *inode,
1647 int name_index,
1648 const char *name,
1649 struct ocfs2_xattr_search *xs)
1650{
1651 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1652 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1653 int ret;
1654 int has_space = 0;
1655
1656 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
1657 return 0;
1658
1659 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
1660 down_read(&oi->ip_alloc_sem);
1661 has_space = ocfs2_xattr_has_space_inline(inode, di);
1662 up_read(&oi->ip_alloc_sem);
1663 if (!has_space)
1664 return 0;
1665 }
1666
1667 xs->xattr_bh = xs->inode_bh;
1668 xs->end = (void *)di + inode->i_sb->s_blocksize;
1669 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
1670 xs->header = (struct ocfs2_xattr_header *)
1671 (xs->end - le16_to_cpu(di->i_xattr_inline_size));
1672 else
1673 xs->header = (struct ocfs2_xattr_header *)
1674 (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
1675 xs->base = (void *)xs->header;
1676 xs->here = xs->header->xh_entries;
1677
1678 /* Find the named attribute. */
1679 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
1680 ret = ocfs2_xattr_find_entry(name_index, name, xs);
1681 if (ret && ret != -ENODATA)
1682 return ret;
1683 xs->not_found = ret;
1684 }
1685
1686 return 0;
1687}
1688
1689/*
1690 * ocfs2_xattr_ibody_set()
1691 *
1692 * Set, replace or remove an extended attribute into inode block.
1693 *
1694 */
1695static int ocfs2_xattr_ibody_set(struct inode *inode,
1696 struct ocfs2_xattr_info *xi,
1697 struct ocfs2_xattr_search *xs)
1698{
1699 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1700 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1701 int ret;
1702
1703 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
1704 return -ENOSPC;
1705
1706 down_write(&oi->ip_alloc_sem);
1707 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
1708 if (!ocfs2_xattr_has_space_inline(inode, di)) {
1709 ret = -ENOSPC;
1710 goto out;
1711 }
1712 }
1713
1714 ret = ocfs2_xattr_set_entry(inode, xi, xs,
1715 (OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL));
1716out:
1717 up_write(&oi->ip_alloc_sem);
1718
1719 return ret;
1720}
1721
1722/*
1723 * ocfs2_xattr_block_find()
1724 *
1725 * Find extended attribute in external block and
1726 * fill search info into struct ocfs2_xattr_search.
1727 */
1728static int ocfs2_xattr_block_find(struct inode *inode,
1729 int name_index,
1730 const char *name,
1731 struct ocfs2_xattr_search *xs)
1732{
1733 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1734 struct buffer_head *blk_bh = NULL;
589dc260 1735 struct ocfs2_xattr_block *xb;
cf1d6c76
TY		 1736 int ret = 0;
1737
1738 if (!di->i_xattr_loc)
1739 return ret;
1740
1741 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
1742 le64_to_cpu(di->i_xattr_loc),
1743 &blk_bh, OCFS2_BH_CACHED, inode);
1744 if (ret < 0) {
1745 mlog_errno(ret);
1746 return ret;
1747 }
1748 /*Verify the signature of xattr block*/
1749 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
1750 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
1751 ret = -EFAULT;
1752 goto cleanup;
1753 }
1754
1755 xs->xattr_bh = blk_bh;
589dc260
TM		 1756 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1757
1758 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
1759 xs->header = &xb->xb_attrs.xb_header;
1760 xs->base = (void *)xs->header;
1761 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
1762 xs->here = xs->header->xh_entries;
1763
1764 ret = ocfs2_xattr_find_entry(name_index, name, xs);
1765 } else
1766 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
1767 name_index,
1768 name, xs);
cf1d6c76 1769
cf1d6c76
TY		 1770 if (ret && ret != -ENODATA) {
1771 xs->xattr_bh = NULL;
1772 goto cleanup;
1773 }
1774 xs->not_found = ret;
1775 return 0;
cf1d6c76
TY		 1776cleanup:
1777 brelse(blk_bh);
1778
1779 return ret;
1780}
1781
01225596
TM		 1782/*
1783 * When all the xattrs are deleted from index btree, the ocfs2_xattr_tree
1784 * will be erased and ocfs2_xattr_block will have its ocfs2_xattr_header
1785 * re-initialized.
1786 */
1787static int ocfs2_restore_xattr_block(struct inode *inode,
1788 struct ocfs2_xattr_search *xs)
1789{
1790 int ret;
1791 handle_t *handle;
1792 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1793 struct ocfs2_xattr_block *xb =
1794 (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1795 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
1796 u16 xb_flags = le16_to_cpu(xb->xb_flags);
1797
1798 BUG_ON(!(xb_flags & OCFS2_XATTR_INDEXED) ||
1799 le16_to_cpu(el->l_next_free_rec) != 0);
1800
1801 handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
1802 if (IS_ERR(handle)) {
1803 ret = PTR_ERR(handle);
1804 handle = NULL;
1805 goto out;
1806 }
1807
1808 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1809 OCFS2_JOURNAL_ACCESS_WRITE);
1810 if (ret < 0) {
1811 mlog_errno(ret);
1812 goto out_commit;
1813 }
1814
1815 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
1816 offsetof(struct ocfs2_xattr_block, xb_attrs));
1817
1818 xb->xb_flags = cpu_to_le16(xb_flags & ~OCFS2_XATTR_INDEXED);
1819
1820 ocfs2_journal_dirty(handle, xs->xattr_bh);
1821
1822out_commit:
1823 ocfs2_commit_trans(osb, handle);
1824out:
1825 return ret;
1826}
1827
cf1d6c76
TY		 1828/*
1829 * ocfs2_xattr_block_set()
1830 *
1831 * Set, replace or remove an extended attribute into external block.
1832 *
1833 */
1834static int ocfs2_xattr_block_set(struct inode *inode,
1835 struct ocfs2_xattr_info *xi,
1836 struct ocfs2_xattr_search *xs)
1837{
1838 struct buffer_head *new_bh = NULL;
1839 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1840 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1841 struct ocfs2_alloc_context *meta_ac = NULL;
1842 handle_t *handle = NULL;
1843 struct ocfs2_xattr_block *xblk = NULL;
1844 u16 suballoc_bit_start;
1845 u32 num_got;
1846 u64 first_blkno;
1847 int ret;
1848
1849 if (!xs->xattr_bh) {
1850 /*
1851 * Alloc one external block for extended attribute
1852 * outside of inode.
1853 */
1854 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
1855 if (ret < 0) {
1856 mlog_errno(ret);
1857 goto out;
1858 }
1859 handle = ocfs2_start_trans(osb,
1860 OCFS2_XATTR_BLOCK_CREATE_CREDITS);
1861 if (IS_ERR(handle)) {
1862 ret = PTR_ERR(handle);
1863 mlog_errno(ret);
1864 goto out;
1865 }
1866 ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
1867 OCFS2_JOURNAL_ACCESS_CREATE);
1868 if (ret < 0) {
1869 mlog_errno(ret);
1870 goto out_commit;
1871 }
1872
1873 ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1,
1874 &suballoc_bit_start, &num_got,
1875 &first_blkno);
1876 if (ret < 0) {
1877 mlog_errno(ret);
1878 goto out_commit;
1879 }
1880
1881 new_bh = sb_getblk(inode->i_sb, first_blkno);
1882 ocfs2_set_new_buffer_uptodate(inode, new_bh);
1883
1884 ret = ocfs2_journal_access(handle, inode, new_bh,
1885 OCFS2_JOURNAL_ACCESS_CREATE);
1886 if (ret < 0) {
1887 mlog_errno(ret);
1888 goto out_commit;
1889 }
1890
1891 /* Initialize ocfs2_xattr_block */
1892 xs->xattr_bh = new_bh;
1893 xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
1894 memset(xblk, 0, inode->i_sb->s_blocksize);
1895 strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
1896 xblk->xb_suballoc_slot = cpu_to_le16(osb->slot_num);
1897 xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
1898 xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation);
1899 xblk->xb_blkno = cpu_to_le64(first_blkno);
1900
1901 xs->header = &xblk->xb_attrs.xb_header;
1902 xs->base = (void *)xs->header;
1903 xs->end = (void *)xblk + inode->i_sb->s_blocksize;
1904 xs->here = xs->header->xh_entries;
1905
1906
1907 ret = ocfs2_journal_dirty(handle, new_bh);
1908 if (ret < 0) {
1909 mlog_errno(ret);
1910 goto out_commit;
1911 }
1912 di->i_xattr_loc = cpu_to_le64(first_blkno);
1913 ret = ocfs2_journal_dirty(handle, xs->inode_bh);
1914 if (ret < 0)
1915 mlog_errno(ret);
1916out_commit:
1917 ocfs2_commit_trans(osb, handle);
1918out:
1919 if (meta_ac)
1920 ocfs2_free_alloc_context(meta_ac);
1921 if (ret < 0)
1922 return ret;
01225596
TM		 1923 } else
1924 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1925
1926 if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
1927 /* Set extended attribute into external block */
1928 ret = ocfs2_xattr_set_entry(inode, xi, xs, OCFS2_HAS_XATTR_FL);
1929 if (!ret || ret != -ENOSPC)
1930 goto end;
1931
1932 ret = ocfs2_xattr_create_index_block(inode, xs);
1933 if (ret)
1934 goto end;
cf1d6c76
TY		 1935 }
1936
01225596
TM		 1937 ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs);
1938 if (!ret && xblk->xb_attrs.xb_root.xt_list.l_next_free_rec == 0)
1939 ret = ocfs2_restore_xattr_block(inode, xs);
1940
1941end:
cf1d6c76
TY		 1942
1943 return ret;
1944}
1945
1946/*
1947 * ocfs2_xattr_set()
1948 *
1949 * Set, replace or remove an extended attribute for this inode.
1950 * value is NULL to remove an existing extended attribute, else either
1951 * create or replace an extended attribute.
1952 */
1953int ocfs2_xattr_set(struct inode *inode,
1954 int name_index,
1955 const char *name,
1956 const void *value,
1957 size_t value_len,
1958 int flags)
1959{
1960 struct buffer_head *di_bh = NULL;
1961 struct ocfs2_dinode *di;
1962 int ret;
01225596 1963 u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
cf1d6c76
TY		 1964
1965 struct ocfs2_xattr_info xi = {
1966 .name_index = name_index,
1967 .name = name,
1968 .value = value,
1969 .value_len = value_len,
1970 };
1971
1972 struct ocfs2_xattr_search xis = {
1973 .not_found = -ENODATA,
1974 };
1975
1976 struct ocfs2_xattr_search xbs = {
1977 .not_found = -ENODATA,
1978 };
1979
1980 ret = ocfs2_inode_lock(inode, &di_bh, 1);
1981 if (ret < 0) {
1982 mlog_errno(ret);
1983 return ret;
1984 }
1985 xis.inode_bh = xbs.inode_bh = di_bh;
1986 di = (struct ocfs2_dinode *)di_bh->b_data;
1987
1988 down_write(&OCFS2_I(inode)->ip_xattr_sem);
1989 /*
1990 * Scan inode and external block to find the same name
1991 * extended attribute and collect search infomation.
1992 */
1993 ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
1994 if (ret)
1995 goto cleanup;
1996 if (xis.not_found) {
1997 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
1998 if (ret)
1999 goto cleanup;
2000 }
2001
2002 if (xis.not_found && xbs.not_found) {
2003 ret = -ENODATA;
2004 if (flags & XATTR_REPLACE)
2005 goto cleanup;
2006 ret = 0;
2007 if (!value)
2008 goto cleanup;
2009 } else {
2010 ret = -EEXIST;
2011 if (flags & XATTR_CREATE)
2012 goto cleanup;
2013 }
2014
2015 if (!value) {
2016 /* Remove existing extended attribute */
2017 if (!xis.not_found)
2018 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
2019 else if (!xbs.not_found)
2020 ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
2021 } else {
2022 /* We always try to set extended attribute into inode first*/
2023 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
2024 if (!ret && !xbs.not_found) {
2025 /*
2026 * If succeed and that extended attribute existing in
2027 * external block, then we will remove it.
2028 */
2029 xi.value = NULL;
2030 xi.value_len = 0;
2031 ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
2032 } else if (ret == -ENOSPC) {
2033 if (di->i_xattr_loc && !xbs.xattr_bh) {
2034 ret = ocfs2_xattr_block_find(inode, name_index,
2035 name, &xbs);
2036 if (ret)
2037 goto cleanup;
2038 }
2039 /*
2040 * If no space in inode, we will set extended attribute
2041 * into external block.
2042 */
2043 ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
2044 if (ret)
2045 goto cleanup;
2046 if (!xis.not_found) {
2047 /*
2048 * If succeed and that extended attribute
2049 * existing in inode, we will remove it.
2050 */
2051 xi.value = NULL;
2052 xi.value_len = 0;
2053 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
2054 }
2055 }
2056 }
2057cleanup:
2058 up_write(&OCFS2_I(inode)->ip_xattr_sem);
2059 ocfs2_inode_unlock(inode, 1);
2060 brelse(di_bh);
2061 brelse(xbs.xattr_bh);
01225596
TM		 2062 for (i = 0; i < blk_per_bucket; i++)
2063 brelse(xbs.bucket.bhs[i]);
cf1d6c76
TY		 2064
2065 return ret;
2066}
2067
589dc260
TM		 2068static inline u32 ocfs2_xattr_hash_by_name(struct inode *inode,
2069 int name_index,
2070 const char *suffix_name)
2071{
2072 struct xattr_handler *handler = ocfs2_xattr_handler(name_index);
2073 char *prefix = handler->prefix;
2074 int prefix_len = strlen(handler->prefix);
2075
2076 return ocfs2_xattr_name_hash(inode, prefix, prefix_len,
2077 (char *)suffix_name, strlen(suffix_name));
2078}
2079
0c044f0b
TM		 2080/*
2081 * Find the xattr extent rec which may contains name_hash.
2082 * e_cpos will be the first name hash of the xattr rec.
2083 * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
2084 */
2085static int ocfs2_xattr_get_rec(struct inode *inode,
2086 u32 name_hash,
2087 u64 *p_blkno,
2088 u32 *e_cpos,
2089 u32 *num_clusters,
2090 struct ocfs2_extent_list *el)
2091{
2092 int ret = 0, i;
2093 struct buffer_head *eb_bh = NULL;
2094 struct ocfs2_extent_block *eb;
2095 struct ocfs2_extent_rec *rec = NULL;
2096 u64 e_blkno = 0;
2097
2098 if (el->l_tree_depth) {
2099 ret = ocfs2_find_leaf(inode, el, name_hash, &eb_bh);
2100 if (ret) {
2101 mlog_errno(ret);
2102 goto out;
2103 }
2104
2105 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2106 el = &eb->h_list;
2107
2108 if (el->l_tree_depth) {
2109 ocfs2_error(inode->i_sb,
2110 "Inode %lu has non zero tree depth in "
2111 "xattr tree block %llu\n", inode->i_ino,
2112 (unsigned long long)eb_bh->b_blocknr);
2113 ret = -EROFS;
2114 goto out;
2115 }
2116 }
2117
2118 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
2119 rec = &el->l_recs[i];
2120
2121 if (le32_to_cpu(rec->e_cpos) <= name_hash) {
2122 e_blkno = le64_to_cpu(rec->e_blkno);
2123 break;
2124 }
2125 }
2126
2127 if (!e_blkno) {
2128 ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
2129 "record (%u, %u, 0) in xattr", inode->i_ino,
2130 le32_to_cpu(rec->e_cpos),
2131 ocfs2_rec_clusters(el, rec));
2132 ret = -EROFS;
2133 goto out;
2134 }
2135
2136 *p_blkno = le64_to_cpu(rec->e_blkno);
2137 *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
2138 if (e_cpos)
2139 *e_cpos = le32_to_cpu(rec->e_cpos);
2140out:
2141 brelse(eb_bh);
2142 return ret;
2143}
2144
2145typedef int (xattr_bucket_func)(struct inode *inode,
2146 struct ocfs2_xattr_bucket *bucket,
2147 void *para);
2148
589dc260
TM		 2149static int ocfs2_find_xe_in_bucket(struct inode *inode,
2150 struct buffer_head *header_bh,
2151 int name_index,
2152 const char *name,
2153 u32 name_hash,
2154 u16 *xe_index,
2155 int *found)
2156{
2157 int i, ret = 0, cmp = 1, block_off, new_offset;
2158 struct ocfs2_xattr_header *xh =
2159 (struct ocfs2_xattr_header *)header_bh->b_data;
2160 size_t name_len = strlen(name);
2161 struct ocfs2_xattr_entry *xe = NULL;
2162 struct buffer_head *name_bh = NULL;
2163 char *xe_name;
2164
2165 /*
2166 * We don't use binary search in the bucket because there
2167 * may be multiple entries with the same name hash.
2168 */
2169 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
2170 xe = &xh->xh_entries[i];
2171
2172 if (name_hash > le32_to_cpu(xe->xe_name_hash))
2173 continue;
2174 else if (name_hash < le32_to_cpu(xe->xe_name_hash))
2175 break;
2176
2177 cmp = name_index - ocfs2_xattr_get_type(xe);
2178 if (!cmp)
2179 cmp = name_len - xe->xe_name_len;
2180 if (cmp)
2181 continue;
2182
2183 ret = ocfs2_xattr_bucket_get_name_value(inode,
2184 xh,
2185 i,
2186 &block_off,
2187 &new_offset);
2188 if (ret) {
2189 mlog_errno(ret);
2190 break;
2191 }
2192
2193 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
2194 header_bh->b_blocknr + block_off,
2195 &name_bh, OCFS2_BH_CACHED, inode);
2196 if (ret) {
2197 mlog_errno(ret);
2198 break;
2199 }
2200 xe_name = name_bh->b_data + new_offset;
2201
2202 cmp = memcmp(name, xe_name, name_len);
2203 brelse(name_bh);
2204 name_bh = NULL;
2205
2206 if (cmp == 0) {
2207 *xe_index = i;
2208 *found = 1;
2209 ret = 0;
2210 break;
2211 }
2212 }
2213
2214 return ret;
2215}
2216
2217/*
2218 * Find the specified xattr entry in a series of buckets.
2219 * This series start from p_blkno and last for num_clusters.
2220 * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
2221 * the num of the valid buckets.
2222 *
2223 * Return the buffer_head this xattr should reside in. And if the xattr's
2224 * hash is in the gap of 2 buckets, return the lower bucket.
2225 */
2226static int ocfs2_xattr_bucket_find(struct inode *inode,
2227 int name_index,
2228 const char *name,
2229 u32 name_hash,
2230 u64 p_blkno,
2231 u32 first_hash,
2232 u32 num_clusters,
2233 struct ocfs2_xattr_search *xs)
2234{
2235 int ret, found = 0;
2236 struct buffer_head *bh = NULL;
2237 struct buffer_head *lower_bh = NULL;
2238 struct ocfs2_xattr_header *xh = NULL;
2239 struct ocfs2_xattr_entry *xe = NULL;
2240 u16 index = 0;
2241 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2242 int low_bucket = 0, bucket, high_bucket;
2243 u32 last_hash;
2244 u64 blkno;
2245
2246 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), p_blkno,
2247 &bh, OCFS2_BH_CACHED, inode);
2248 if (ret) {
2249 mlog_errno(ret);
2250 goto out;
2251 }
2252
2253 xh = (struct ocfs2_xattr_header *)bh->b_data;
2254 high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
2255
2256 while (low_bucket <= high_bucket) {
2257 brelse(bh);
2258 bh = NULL;
2259 bucket = (low_bucket + high_bucket) / 2;
2260
2261 blkno = p_blkno + bucket * blk_per_bucket;
2262
2263 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno,
2264 &bh, OCFS2_BH_CACHED, inode);
2265 if (ret) {
2266 mlog_errno(ret);
2267 goto out;
2268 }
2269
2270 xh = (struct ocfs2_xattr_header *)bh->b_data;
2271 xe = &xh->xh_entries[0];
2272 if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
2273 high_bucket = bucket - 1;
2274 continue;
2275 }
2276
2277 /*
2278 * Check whether the hash of the last entry in our
2279 * bucket is larger than the search one.
2280 */
2281 xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
2282 last_hash = le32_to_cpu(xe->xe_name_hash);
2283
2284 /* record lower_bh which may be the insert place. */
2285 brelse(lower_bh);
2286 lower_bh = bh;
2287 bh = NULL;
2288
2289 if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
2290 low_bucket = bucket + 1;
2291 continue;
2292 }
2293
2294 /* the searched xattr should reside in this bucket if exists. */
2295 ret = ocfs2_find_xe_in_bucket(inode, lower_bh,
2296 name_index, name, name_hash,
2297 &index, &found);
2298 if (ret) {
2299 mlog_errno(ret);
2300 goto out;
2301 }
2302 break;
2303 }
2304
2305 /*
2306 * Record the bucket we have found.
2307 * When the xattr's hash value is in the gap of 2 buckets, we will
2308 * always set it to the previous bucket.
2309 */
2310 if (!lower_bh) {
2311 /*
2312 * We can't find any bucket whose first name_hash is less
2313 * than the find name_hash.
2314 */
2315 BUG_ON(bh->b_blocknr != p_blkno);
2316 lower_bh = bh;
2317 bh = NULL;
2318 }
2319 xs->bucket.bhs[0] = lower_bh;
2320 xs->bucket.xh = (struct ocfs2_xattr_header *)
2321 xs->bucket.bhs[0]->b_data;
2322 lower_bh = NULL;
2323
2324 xs->header = xs->bucket.xh;
2325 xs->base = xs->bucket.bhs[0]->b_data;
2326 xs->end = xs->base + inode->i_sb->s_blocksize;
2327
2328 if (found) {
2329 /*
2330 * If we have found the xattr enty, read all the blocks in
2331 * this bucket.
2332 */
2333 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb),
2334 xs->bucket.bhs[0]->b_blocknr + 1,
2335 blk_per_bucket - 1, &xs->bucket.bhs[1],
2336 OCFS2_BH_CACHED, inode);
2337 if (ret) {
2338 mlog_errno(ret);
2339 goto out;
2340 }
2341
2342 xs->here = &xs->header->xh_entries[index];
2343 mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name,
2344 (unsigned long long)xs->bucket.bhs[0]->b_blocknr, index);
2345 } else
2346 ret = -ENODATA;
2347
2348out:
2349 brelse(bh);
2350 brelse(lower_bh);
2351 return ret;
2352}
2353
2354static int ocfs2_xattr_index_block_find(struct inode *inode,
2355 struct buffer_head *root_bh,
2356 int name_index,
2357 const char *name,
2358 struct ocfs2_xattr_search *xs)
2359{
2360 int ret;
2361 struct ocfs2_xattr_block *xb =
2362 (struct ocfs2_xattr_block *)root_bh->b_data;
2363 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
2364 struct ocfs2_extent_list *el = &xb_root->xt_list;
2365 u64 p_blkno = 0;
2366 u32 first_hash, num_clusters = 0;
2367 u32 name_hash = ocfs2_xattr_hash_by_name(inode, name_index, name);
2368
2369 if (le16_to_cpu(el->l_next_free_rec) == 0)
2370 return -ENODATA;
2371
2372 mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n",
2373 name, name_hash, name_index);
2374
2375 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
2376 &num_clusters, el);
2377 if (ret) {
2378 mlog_errno(ret);
2379 goto out;
2380 }
2381
2382 BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
2383
2384 mlog(0, "find xattr extent rec %u clusters from %llu, the first hash "
2385 "in the rec is %u\n", num_clusters, p_blkno, first_hash);
2386
2387 ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
2388 p_blkno, first_hash, num_clusters, xs);
2389
2390out:
2391 return ret;
2392}
2393
0c044f0b
TM		 2394static int ocfs2_iterate_xattr_buckets(struct inode *inode,
2395 u64 blkno,
2396 u32 clusters,
2397 xattr_bucket_func *func,
2398 void *para)
2399{
2400 int i, j, ret = 0;
2401 int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2402 u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
2403 u32 num_buckets = clusters * bpc;
2404 struct ocfs2_xattr_bucket bucket;
2405
2406 memset(&bucket, 0, sizeof(bucket));
2407
2408 mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n",
2409 clusters, blkno);
2410
2411 for (i = 0; i < num_buckets; i++, blkno += blk_per_bucket) {
2412 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb),
2413 blkno, blk_per_bucket,
2414 bucket.bhs, OCFS2_BH_CACHED, inode);
2415 if (ret) {
2416 mlog_errno(ret);
2417 goto out;
2418 }
2419
2420 bucket.xh = (struct ocfs2_xattr_header *)bucket.bhs[0]->b_data;
2421 /*
2422 * The real bucket num in this series of blocks is stored
2423 * in the 1st bucket.
2424 */
2425 if (i == 0)
2426 num_buckets = le16_to_cpu(bucket.xh->xh_num_buckets);
2427
2428 mlog(0, "iterating xattr bucket %llu\n", blkno);
2429 if (func) {
2430 ret = func(inode, &bucket, para);
2431 if (ret) {
2432 mlog_errno(ret);
2433 break;
2434 }
2435 }
2436
2437 for (j = 0; j < blk_per_bucket; j++)
2438 brelse(bucket.bhs[j]);
2439 memset(&bucket, 0, sizeof(bucket));
2440 }
2441
2442out:
2443 for (j = 0; j < blk_per_bucket; j++)
2444 brelse(bucket.bhs[j]);
2445
2446 return ret;
2447}
2448
2449struct ocfs2_xattr_tree_list {
2450 char *buffer;
2451 size_t buffer_size;
2452};
2453
2454static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
2455 struct ocfs2_xattr_header *xh,
2456 int index,
2457 int *block_off,
2458 int *new_offset)
2459{
2460 u16 name_offset;
2461
2462 if (index < 0 || index >= le16_to_cpu(xh->xh_count))
2463 return -EINVAL;
2464
2465 name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
2466
2467 *block_off = name_offset >> inode->i_sb->s_blocksize_bits;
2468 *new_offset = name_offset % inode->i_sb->s_blocksize;
2469
2470 return 0;
2471}
2472
2473static int ocfs2_list_xattr_bucket(struct inode *inode,
2474 struct ocfs2_xattr_bucket *bucket,
2475 void *para)
2476{
2477 int ret = 0;
2478 struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
2479 size_t size;
2480 int i, block_off, new_offset;
2481
2482 for (i = 0 ; i < le16_to_cpu(bucket->xh->xh_count); i++) {
2483 struct ocfs2_xattr_entry *entry = &bucket->xh->xh_entries[i];
2484 struct xattr_handler *handler =
2485 ocfs2_xattr_handler(ocfs2_xattr_get_type(entry));
2486
2487 if (handler) {
2488 ret = ocfs2_xattr_bucket_get_name_value(inode,
2489 bucket->xh,
2490 i,
2491 &block_off,
2492 &new_offset);
2493 if (ret)
2494 break;
2495 size = handler->list(inode, xl->buffer, xl->buffer_size,
2496 bucket->bhs[block_off]->b_data +
2497 new_offset,
2498 entry->xe_name_len);
2499 if (xl->buffer) {
2500 if (size > xl->buffer_size)
2501 return -ERANGE;
2502 xl->buffer += size;
2503 }
2504 xl->buffer_size -= size;
2505 }
2506 }
2507
2508 return ret;
2509}
2510
2511static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
2512 struct ocfs2_xattr_tree_root *xt,
2513 char *buffer,
2514 size_t buffer_size)
2515{
2516 struct ocfs2_extent_list *el = &xt->xt_list;
2517 int ret = 0;
2518 u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
2519 u64 p_blkno = 0;
2520 struct ocfs2_xattr_tree_list xl = {
2521 .buffer = buffer,
2522 .buffer_size = buffer_size,
2523 };
2524
2525 if (le16_to_cpu(el->l_next_free_rec) == 0)
2526 return 0;
2527
2528 while (name_hash > 0) {
2529 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
2530 &e_cpos, &num_clusters, el);
2531 if (ret) {
2532 mlog_errno(ret);
2533 goto out;
2534 }
2535
2536 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
2537 ocfs2_list_xattr_bucket,
2538 &xl);
2539 if (ret) {
2540 mlog_errno(ret);
2541 goto out;
2542 }
2543
2544 if (e_cpos == 0)
2545 break;
2546
2547 name_hash = e_cpos - 1;
2548 }
2549
2550 ret = buffer_size - xl.buffer_size;
2551out:
2552 return ret;
2553}
01225596
TM		 2554
2555static int cmp_xe(const void *a, const void *b)
2556{
2557 const struct ocfs2_xattr_entry *l = a, *r = b;
2558 u32 l_hash = le32_to_cpu(l->xe_name_hash);
2559 u32 r_hash = le32_to_cpu(r->xe_name_hash);
2560
2561 if (l_hash > r_hash)
2562 return 1;
2563 if (l_hash < r_hash)
2564 return -1;
2565 return 0;
2566}
2567
2568static void swap_xe(void *a, void *b, int size)
2569{
2570 struct ocfs2_xattr_entry *l = a, *r = b, tmp;
2571
2572 tmp = *l;
2573 memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
2574 memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
2575}
2576
2577/*
2578 * When the ocfs2_xattr_block is filled up, new bucket will be created
2579 * and all the xattr entries will be moved to the new bucket.
2580 * Note: we need to sort the entries since they are not saved in order
2581 * in the ocfs2_xattr_block.
2582 */
2583static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
2584 struct buffer_head *xb_bh,
2585 struct buffer_head *xh_bh,
2586 struct buffer_head *data_bh)
2587{
2588 int i, blocksize = inode->i_sb->s_blocksize;
2589 u16 offset, size, off_change;
2590 struct ocfs2_xattr_entry *xe;
2591 struct ocfs2_xattr_block *xb =
2592 (struct ocfs2_xattr_block *)xb_bh->b_data;
2593 struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
2594 struct ocfs2_xattr_header *xh =
2595 (struct ocfs2_xattr_header *)xh_bh->b_data;
2596 u16 count = le16_to_cpu(xb_xh->xh_count);
2597 char *target = xh_bh->b_data, *src = xb_bh->b_data;
2598
2599 mlog(0, "cp xattr from block %llu to bucket %llu\n",
2600 (unsigned long long)xb_bh->b_blocknr,
2601 (unsigned long long)xh_bh->b_blocknr);
2602
2603 memset(xh_bh->b_data, 0, blocksize);
2604 if (data_bh)
2605 memset(data_bh->b_data, 0, blocksize);
2606 /*
2607 * Since the xe_name_offset is based on ocfs2_xattr_header,
2608 * there is a offset change corresponding to the change of
2609 * ocfs2_xattr_header's position.
2610 */
2611 off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
2612 xe = &xb_xh->xh_entries[count - 1];
2613 offset = le16_to_cpu(xe->xe_name_offset) + off_change;
2614 size = blocksize - offset;
2615
2616 /* copy all the names and values. */
2617 if (data_bh)
2618 target = data_bh->b_data;
2619 memcpy(target + offset, src + offset, size);
2620
2621 /* Init new header now. */
2622 xh->xh_count = xb_xh->xh_count;
2623 xh->xh_num_buckets = cpu_to_le16(1);
2624 xh->xh_name_value_len = cpu_to_le16(size);
2625 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
2626
2627 /* copy all the entries. */
2628 target = xh_bh->b_data;
2629 offset = offsetof(struct ocfs2_xattr_header, xh_entries);
2630 size = count * sizeof(struct ocfs2_xattr_entry);
2631 memcpy(target + offset, (char *)xb_xh + offset, size);
2632
2633 /* Change the xe offset for all the xe because of the move. */
2634 off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
2635 offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
2636 for (i = 0; i < count; i++)
2637 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
2638
2639 mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n",
2640 offset, size, off_change);
2641
2642 sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
2643 cmp_xe, swap_xe);
2644}
2645
2646/*
2647 * After we move xattr from block to index btree, we have to
2648 * update ocfs2_xattr_search to the new xe and base.
2649 *
2650 * When the entry is in xattr block, xattr_bh indicates the storage place.
2651 * While if the entry is in index b-tree, "bucket" indicates the
2652 * real place of the xattr.
2653 */
2654static int ocfs2_xattr_update_xattr_search(struct inode *inode,
2655 struct ocfs2_xattr_search *xs,
2656 struct buffer_head *old_bh,
2657 struct buffer_head *new_bh)
2658{
2659 int ret = 0;
2660 char *buf = old_bh->b_data;
2661 struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
2662 struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
2663 int i, blocksize = inode->i_sb->s_blocksize;
2664 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2665
2666 xs->bucket.bhs[0] = new_bh;
2667 get_bh(new_bh);
2668 xs->bucket.xh = (struct ocfs2_xattr_header *)xs->bucket.bhs[0]->b_data;
2669 xs->header = xs->bucket.xh;
2670
2671 xs->base = new_bh->b_data;
2672 xs->end = xs->base + inode->i_sb->s_blocksize;
2673
2674 if (!xs->not_found) {
2675 if (OCFS2_XATTR_BUCKET_SIZE != blocksize) {
2676 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb),
2677 xs->bucket.bhs[0]->b_blocknr + 1,
2678 blk_per_bucket - 1, &xs->bucket.bhs[1],
2679 OCFS2_BH_CACHED, inode);
2680 if (ret) {
2681 mlog_errno(ret);
2682 return ret;
2683 }
2684
2685 i = xs->here - old_xh->xh_entries;
2686 xs->here = &xs->header->xh_entries[i];
2687 }
2688 }
2689
2690 return ret;
2691}
2692
2693static int ocfs2_xattr_create_index_block(struct inode *inode,
2694 struct ocfs2_xattr_search *xs)
2695{
2696 int ret, credits = OCFS2_SUBALLOC_ALLOC;
2697 u32 bit_off, len;
2698 u64 blkno;
2699 handle_t *handle;
2700 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2701 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2702 struct ocfs2_alloc_context *data_ac;
2703 struct buffer_head *xh_bh = NULL, *data_bh = NULL;
2704 struct buffer_head *xb_bh = xs->xattr_bh;
2705 struct ocfs2_xattr_block *xb =
2706 (struct ocfs2_xattr_block *)xb_bh->b_data;
2707 struct ocfs2_xattr_tree_root *xr;
2708 u16 xb_flags = le16_to_cpu(xb->xb_flags);
2709 u16 bpb = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2710
2711 mlog(0, "create xattr index block for %llu\n",
2712 (unsigned long long)xb_bh->b_blocknr);
2713
2714 BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
2715
2716 ret = ocfs2_reserve_clusters(osb, 1, &data_ac);
2717 if (ret) {
2718 mlog_errno(ret);
2719 goto out;
2720 }
2721
2722 /*
2723 * XXX:
2724 * We can use this lock for now, and maybe move to a dedicated mutex
2725 * if performance becomes a problem later.
2726 */
2727 down_write(&oi->ip_alloc_sem);
2728
2729 /*
2730 * 3 more credits, one for xattr block update, one for the 1st block
2731 * of the new xattr bucket and one for the value/data.
2732 */
2733 credits += 3;
2734 handle = ocfs2_start_trans(osb, credits);
2735 if (IS_ERR(handle)) {
2736 ret = PTR_ERR(handle);
2737 mlog_errno(ret);
2738 goto out_sem;
2739 }
2740
2741 ret = ocfs2_journal_access(handle, inode, xb_bh,
2742 OCFS2_JOURNAL_ACCESS_WRITE);
2743 if (ret) {
2744 mlog_errno(ret);
2745 goto out_commit;
2746 }
2747
2748 ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off, &len);
2749 if (ret) {
2750 mlog_errno(ret);
2751 goto out_commit;
2752 }
2753
2754 /*
2755 * The bucket may spread in many blocks, and
2756 * we will only touch the 1st block and the last block
2757 * in the whole bucket(one for entry and one for data).
2758 */
2759 blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
2760
2761 mlog(0, "allocate 1 cluster from %llu to xattr block\n", blkno);
2762
2763 xh_bh = sb_getblk(inode->i_sb, blkno);
2764 if (!xh_bh) {
2765 ret = -EIO;
2766 mlog_errno(ret);
2767 goto out_commit;
2768 }
2769
2770 ocfs2_set_new_buffer_uptodate(inode, xh_bh);
2771
2772 ret = ocfs2_journal_access(handle, inode, xh_bh,
2773 OCFS2_JOURNAL_ACCESS_CREATE);
2774 if (ret) {
2775 mlog_errno(ret);
2776 goto out_commit;
2777 }
2778
2779 if (bpb > 1) {
2780 data_bh = sb_getblk(inode->i_sb, blkno + bpb - 1);
2781 if (!data_bh) {
2782 ret = -EIO;
2783 mlog_errno(ret);
2784 goto out_commit;
2785 }
2786
2787 ocfs2_set_new_buffer_uptodate(inode, data_bh);
2788
2789 ret = ocfs2_journal_access(handle, inode, data_bh,
2790 OCFS2_JOURNAL_ACCESS_CREATE);
2791 if (ret) {
2792 mlog_errno(ret);
2793 goto out_commit;
2794 }
2795 }
2796
2797 ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xh_bh, data_bh);
2798
2799 ocfs2_journal_dirty(handle, xh_bh);
2800 if (data_bh)
2801 ocfs2_journal_dirty(handle, data_bh);
2802
2803 ocfs2_xattr_update_xattr_search(inode, xs, xb_bh, xh_bh);
2804
2805 /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
2806 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
2807 offsetof(struct ocfs2_xattr_block, xb_attrs));
2808
2809 xr = &xb->xb_attrs.xb_root;
2810 xr->xt_clusters = cpu_to_le32(1);
2811 xr->xt_last_eb_blk = 0;
2812 xr->xt_list.l_tree_depth = 0;
2813 xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
2814 xr->xt_list.l_next_free_rec = cpu_to_le16(1);
2815
2816 xr->xt_list.l_recs[0].e_cpos = 0;
2817 xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
2818 xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
2819
2820 xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
2821
2822 ret = ocfs2_journal_dirty(handle, xb_bh);
2823 if (ret) {
2824 mlog_errno(ret);
2825 goto out_commit;
2826 }
2827
2828out_commit:
2829 ocfs2_commit_trans(osb, handle);
2830
2831out_sem:
2832 up_write(&oi->ip_alloc_sem);
2833
2834out:
2835 if (data_ac)
2836 ocfs2_free_alloc_context(data_ac);
2837
2838 brelse(xh_bh);
2839 brelse(data_bh);
2840
2841 return ret;
2842}
2843
2844static int cmp_xe_offset(const void *a, const void *b)
2845{
2846 const struct ocfs2_xattr_entry *l = a, *r = b;
2847 u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
2848 u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
2849
2850 if (l_name_offset < r_name_offset)
2851 return 1;
2852 if (l_name_offset > r_name_offset)
2853 return -1;
2854 return 0;
2855}
2856
2857/*
2858 * defrag a xattr bucket if we find that the bucket has some
2859 * holes beteen name/value pairs.
2860 * We will move all the name/value pairs to the end of the bucket
2861 * so that we can spare some space for insertion.
2862 */
2863static int ocfs2_defrag_xattr_bucket(struct inode *inode,
2864 struct ocfs2_xattr_bucket *bucket)
2865{
2866 int ret, i;
2867 size_t end, offset, len, value_len;
2868 struct ocfs2_xattr_header *xh;
2869 char *entries, *buf, *bucket_buf = NULL;
2870 u64 blkno = bucket->bhs[0]->b_blocknr;
2871 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2872 u16 xh_free_start;
2873 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2874 size_t blocksize = inode->i_sb->s_blocksize;
2875 handle_t *handle;
2876 struct buffer_head **bhs;
2877 struct ocfs2_xattr_entry *xe;
2878
2879 bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
2880 GFP_NOFS);
2881 if (!bhs)
2882 return -ENOMEM;
2883
2884 ret = ocfs2_read_blocks(osb, blkno, blk_per_bucket, bhs,
2885 OCFS2_BH_CACHED, inode);
2886 if (ret)
2887 goto out;
2888
2889 /*
2890 * In order to make the operation more efficient and generic,
2891 * we copy all the blocks into a contiguous memory and do the
2892 * defragment there, so if anything is error, we will not touch
2893 * the real block.
2894 */
2895 bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
2896 if (!bucket_buf) {
2897 ret = -EIO;
2898 goto out;
2899 }
2900
2901 buf = bucket_buf;
2902 for (i = 0; i < blk_per_bucket; i++, buf += blocksize)
2903 memcpy(buf, bhs[i]->b_data, blocksize);
2904
2905 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), blk_per_bucket);
2906 if (IS_ERR(handle)) {
2907 ret = PTR_ERR(handle);
2908 handle = NULL;
2909 mlog_errno(ret);
2910 goto out;
2911 }
2912
2913 for (i = 0; i < blk_per_bucket; i++) {
2914 ret = ocfs2_journal_access(handle, inode, bhs[i],
2915 OCFS2_JOURNAL_ACCESS_WRITE);
2916 if (ret < 0) {
2917 mlog_errno(ret);
2918 goto commit;
2919 }
2920 }
2921
2922 xh = (struct ocfs2_xattr_header *)bucket_buf;
2923 entries = (char *)xh->xh_entries;
2924 xh_free_start = le16_to_cpu(xh->xh_free_start);
2925
2926 mlog(0, "adjust xattr bucket in %llu, count = %u, "
2927 "xh_free_start = %u, xh_name_value_len = %u.\n",
2928 blkno, le16_to_cpu(xh->xh_count), xh_free_start,
2929 le16_to_cpu(xh->xh_name_value_len));
2930
2931 /*
2932 * sort all the entries by their offset.
2933 * the largest will be the first, so that we can
2934 * move them to the end one by one.
2935 */
2936 sort(entries, le16_to_cpu(xh->xh_count),
2937 sizeof(struct ocfs2_xattr_entry),
2938 cmp_xe_offset, swap_xe);
2939
2940 /* Move all name/values to the end of the bucket. */
2941 xe = xh->xh_entries;
2942 end = OCFS2_XATTR_BUCKET_SIZE;
2943 for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
2944 offset = le16_to_cpu(xe->xe_name_offset);
2945 if (ocfs2_xattr_is_local(xe))
2946 value_len = OCFS2_XATTR_SIZE(
2947 le64_to_cpu(xe->xe_value_size));
2948 else
2949 value_len = OCFS2_XATTR_ROOT_SIZE;
2950 len = OCFS2_XATTR_SIZE(xe->xe_name_len) + value_len;
2951
2952 /*
2953 * We must make sure that the name/value pair
2954 * exist in the same block. So adjust end to
2955 * the previous block end if needed.
2956 */
2957 if (((end - len) / blocksize !=
2958 (end - 1) / blocksize))
2959 end = end - end % blocksize;
2960
2961 if (end > offset + len) {
2962 memmove(bucket_buf + end - len,
2963 bucket_buf + offset, len);
2964 xe->xe_name_offset = cpu_to_le16(end - len);
2965 }
2966
2967 mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
2968 "bucket %llu\n", (unsigned long long)blkno);
2969
2970 end -= len;
2971 }
2972
2973 mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
2974 "bucket %llu\n", (unsigned long long)blkno);
2975
2976 if (xh_free_start == end)
2977 goto commit;
2978
2979 memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
2980 xh->xh_free_start = cpu_to_le16(end);
2981
2982 /* sort the entries by their name_hash. */
2983 sort(entries, le16_to_cpu(xh->xh_count),
2984 sizeof(struct ocfs2_xattr_entry),
2985 cmp_xe, swap_xe);
2986
2987 buf = bucket_buf;
2988 for (i = 0; i < blk_per_bucket; i++, buf += blocksize) {
2989 memcpy(bhs[i]->b_data, buf, blocksize);
2990 ocfs2_journal_dirty(handle, bhs[i]);
2991 }
2992
2993commit:
2994 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
2995out:
2996
2997 if (bhs) {
2998 for (i = 0; i < blk_per_bucket; i++)
2999 brelse(bhs[i]);
3000 }
3001 kfree(bhs);
3002
3003 kfree(bucket_buf);
3004 return ret;
3005}
3006
3007/*
3008 * Move half nums of the xattr bucket in the previous cluster to this new
3009 * cluster. We only touch the last cluster of the previous extend record.
3010 *
3011 * first_bh is the first buffer_head of a series of bucket in the same
3012 * extent rec and header_bh is the header of one bucket in this cluster.
3013 * They will be updated if we move the data header_bh contains to the new
3014 * cluster. first_hash will be set as the 1st xe's name_hash of the new cluster.
3015 */
3016static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
3017 handle_t *handle,
3018 struct buffer_head **first_bh,
3019 struct buffer_head **header_bh,
3020 u64 new_blkno,
3021 u64 prev_blkno,
3022 u32 num_clusters,
3023 u32 *first_hash)
3024{
3025 int i, ret, credits;
3026 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3027 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3028 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
3029 int blocksize = inode->i_sb->s_blocksize;
3030 struct buffer_head *old_bh, *new_bh, *prev_bh, *new_first_bh = NULL;
3031 struct ocfs2_xattr_header *new_xh;
3032 struct ocfs2_xattr_header *xh =
3033 (struct ocfs2_xattr_header *)((*first_bh)->b_data);
3034
3035 BUG_ON(le16_to_cpu(xh->xh_num_buckets) < num_buckets);
3036 BUG_ON(OCFS2_XATTR_BUCKET_SIZE == osb->s_clustersize);
3037
3038 prev_bh = *first_bh;
3039 get_bh(prev_bh);
3040 xh = (struct ocfs2_xattr_header *)prev_bh->b_data;
3041
3042 prev_blkno += (num_clusters - 1) * bpc + bpc / 2;
3043
3044 mlog(0, "move half of xattrs in cluster %llu to %llu\n",
3045 prev_blkno, new_blkno);
3046
3047 /*
3048 * We need to update the 1st half of the new cluster and
3049 * 1 more for the update of the 1st bucket of the previous
3050 * extent record.
3051 */
3052 credits = bpc / 2 + 1;
3053 ret = ocfs2_extend_trans(handle, credits);
3054 if (ret) {
3055 mlog_errno(ret);
3056 goto out;
3057 }
3058
3059 ret = ocfs2_journal_access(handle, inode, prev_bh,
3060 OCFS2_JOURNAL_ACCESS_WRITE);
3061 if (ret) {
3062 mlog_errno(ret);
3063 goto out;
3064 }
3065
3066 for (i = 0; i < bpc / 2; i++, prev_blkno++, new_blkno++) {
3067 old_bh = new_bh = NULL;
3068 new_bh = sb_getblk(inode->i_sb, new_blkno);
3069 if (!new_bh) {
3070 ret = -EIO;
3071 mlog_errno(ret);
3072 goto out;
3073 }
3074
3075 ocfs2_set_new_buffer_uptodate(inode, new_bh);
3076
3077 ret = ocfs2_journal_access(handle, inode, new_bh,
3078 OCFS2_JOURNAL_ACCESS_CREATE);
3079 if (ret < 0) {
3080 mlog_errno(ret);
3081 brelse(new_bh);
3082 goto out;
3083 }
3084
3085 ret = ocfs2_read_block(osb, prev_blkno,
3086 &old_bh, OCFS2_BH_CACHED, inode);
3087 if (ret < 0) {
3088 mlog_errno(ret);
3089 brelse(new_bh);
3090 goto out;
3091 }
3092
3093 memcpy(new_bh->b_data, old_bh->b_data, blocksize);
3094
3095 if (i == 0) {
3096 new_xh = (struct ocfs2_xattr_header *)new_bh->b_data;
3097 new_xh->xh_num_buckets = cpu_to_le16(num_buckets / 2);
3098
3099 if (first_hash)
3100 *first_hash = le32_to_cpu(
3101 new_xh->xh_entries[0].xe_name_hash);
3102 new_first_bh = new_bh;
3103 get_bh(new_first_bh);
3104 }
3105
3106 ocfs2_journal_dirty(handle, new_bh);
3107
3108 if (*header_bh == old_bh) {
3109 brelse(*header_bh);
3110 *header_bh = new_bh;
3111 get_bh(*header_bh);
3112
3113 brelse(*first_bh);
3114 *first_bh = new_first_bh;
3115 get_bh(*first_bh);
3116 }
3117 brelse(new_bh);
3118 brelse(old_bh);
3119 }
3120
3121 le16_add_cpu(&xh->xh_num_buckets, -(num_buckets / 2));
3122
3123 ocfs2_journal_dirty(handle, prev_bh);
3124out:
3125 brelse(prev_bh);
3126 brelse(new_first_bh);
3127 return ret;
3128}
3129
3130static int ocfs2_read_xattr_bucket(struct inode *inode,
3131 u64 blkno,
3132 struct buffer_head **bhs,
3133 int new)
3134{
3135 int ret = 0;
3136 u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3137
3138 if (!new)
3139 return ocfs2_read_blocks(OCFS2_SB(inode->i_sb), blkno,
3140 blk_per_bucket, bhs,
3141 OCFS2_BH_CACHED, inode);
3142
3143 for (i = 0; i < blk_per_bucket; i++) {
3144 bhs[i] = sb_getblk(inode->i_sb, blkno + i);
3145 if (bhs[i] == NULL) {
3146 ret = -EIO;
3147 mlog_errno(ret);
3148 break;
3149 }
3150 ocfs2_set_new_buffer_uptodate(inode, bhs[i]);
3151 }
3152
3153 return ret;
3154}
3155
3156/*
3157 * Move half num of the xattrs in old bucket(blk) to new bucket(new_blk).
3158 * first_hash will record the 1st hash of the new bucket.
3159 */
3160static int ocfs2_half_xattr_bucket(struct inode *inode,
3161 handle_t *handle,
3162 u64 blk,
3163 u64 new_blk,
3164 u32 *first_hash,
3165 int new_bucket_head)
3166{
3167 int ret, i;
3168 u16 count, start, len, name_value_len, xe_len, name_offset;
3169 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3170 struct buffer_head **s_bhs, **t_bhs = NULL;
3171 struct ocfs2_xattr_header *xh;
3172 struct ocfs2_xattr_entry *xe;
3173 int blocksize = inode->i_sb->s_blocksize;
3174
3175 mlog(0, "move half of xattrs from bucket %llu to %llu\n",
3176 blk, new_blk);
3177
3178 s_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
3179 if (!s_bhs)
3180 return -ENOMEM;
3181
3182 ret = ocfs2_read_xattr_bucket(inode, blk, s_bhs, 0);
3183 if (ret) {
3184 mlog_errno(ret);
3185 goto out;
3186 }
3187
3188 ret = ocfs2_journal_access(handle, inode, s_bhs[0],
3189 OCFS2_JOURNAL_ACCESS_WRITE);
3190 if (ret) {
3191 mlog_errno(ret);
3192 goto out;
3193 }
3194
3195 t_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
3196 if (!t_bhs) {
3197 ret = -ENOMEM;
3198 goto out;
3199 }
3200
3201 ret = ocfs2_read_xattr_bucket(inode, new_blk, t_bhs, new_bucket_head);
3202 if (ret) {
3203 mlog_errno(ret);
3204 goto out;
3205 }
3206
3207 for (i = 0; i < blk_per_bucket; i++) {
3208 ret = ocfs2_journal_access(handle, inode, t_bhs[i],
3209 OCFS2_JOURNAL_ACCESS_CREATE);
3210 if (ret) {
3211 mlog_errno(ret);
3212 goto out;
3213 }
3214 }
3215
3216 /* copy the whole bucket to the new first. */
3217 for (i = 0; i < blk_per_bucket; i++)
3218 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);
3219
3220 /* update the new bucket. */
3221 xh = (struct ocfs2_xattr_header *)t_bhs[0]->b_data;
3222 count = le16_to_cpu(xh->xh_count);
3223 start = count / 2;
3224
3225 /*
3226 * Calculate the total name/value len and xh_free_start for
3227 * the old bucket first.
3228 */
3229 name_offset = OCFS2_XATTR_BUCKET_SIZE;
3230 name_value_len = 0;
3231 for (i = 0; i < start; i++) {
3232 xe = &xh->xh_entries[i];
3233 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3234 if (ocfs2_xattr_is_local(xe))
3235 xe_len +=
3236 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3237 else
3238 xe_len += OCFS2_XATTR_ROOT_SIZE;
3239 name_value_len += xe_len;
3240 if (le16_to_cpu(xe->xe_name_offset) < name_offset)
3241 name_offset = le16_to_cpu(xe->xe_name_offset);
3242 }
3243
3244 /*
3245 * Now begin the modification to the new bucket.
3246 *
3247 * In the new bucket, We just move the xattr entry to the beginning
3248 * and don't touch the name/value. So there will be some holes in the
3249 * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
3250 * called.
3251 */
3252 xe = &xh->xh_entries[start];
3253 len = sizeof(struct ocfs2_xattr_entry) * (count - start);
3254 mlog(0, "mv xattr entry len %d from %d to %d\n", len,
3255 (char *)xe - (char *)xh, (char *)xh->xh_entries - (char *)xh);
3256 memmove((char *)xh->xh_entries, (char *)xe, len);
3257 xe = &xh->xh_entries[count - start];
3258 len = sizeof(struct ocfs2_xattr_entry) * start;
3259 memset((char *)xe, 0, len);
3260
3261 le16_add_cpu(&xh->xh_count, -start);
3262 le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
3263
3264 /* Calculate xh_free_start for the new bucket. */
3265 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
3266 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3267 xe = &xh->xh_entries[i];
3268 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3269 if (ocfs2_xattr_is_local(xe))
3270 xe_len +=
3271 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3272 else
3273 xe_len += OCFS2_XATTR_ROOT_SIZE;
3274 if (le16_to_cpu(xe->xe_name_offset) <
3275 le16_to_cpu(xh->xh_free_start))
3276 xh->xh_free_start = xe->xe_name_offset;
3277 }
3278
3279 /* set xh->xh_num_buckets for the new xh. */
3280 if (new_bucket_head)
3281 xh->xh_num_buckets = cpu_to_le16(1);
3282 else
3283 xh->xh_num_buckets = 0;
3284
3285 for (i = 0; i < blk_per_bucket; i++) {
3286 ocfs2_journal_dirty(handle, t_bhs[i]);
3287 if (ret)
3288 mlog_errno(ret);
3289 }
3290
3291 /* store the first_hash of the new bucket. */
3292 if (first_hash)
3293 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3294
3295 /*
3296 * Now only update the 1st block of the old bucket.
3297 * Please note that the entry has been sorted already above.
3298 */
3299 xh = (struct ocfs2_xattr_header *)s_bhs[0]->b_data;
3300 memset(&xh->xh_entries[start], 0,
3301 sizeof(struct ocfs2_xattr_entry) * (count - start));
3302 xh->xh_count = cpu_to_le16(start);
3303 xh->xh_free_start = cpu_to_le16(name_offset);
3304 xh->xh_name_value_len = cpu_to_le16(name_value_len);
3305
3306 ocfs2_journal_dirty(handle, s_bhs[0]);
3307 if (ret)
3308 mlog_errno(ret);
3309
3310out:
3311 if (s_bhs) {
3312 for (i = 0; i < blk_per_bucket; i++)
3313 brelse(s_bhs[i]);
3314 }
3315 kfree(s_bhs);
3316
3317 if (t_bhs) {
3318 for (i = 0; i < blk_per_bucket; i++)
3319 brelse(t_bhs[i]);
3320 }
3321 kfree(t_bhs);
3322
3323 return ret;
3324}
3325
3326/*
3327 * Copy xattr from one bucket to another bucket.
3328 *
3329 * The caller must make sure that the journal transaction
3330 * has enough space for journaling.
3331 */
3332static int ocfs2_cp_xattr_bucket(struct inode *inode,
3333 handle_t *handle,
3334 u64 s_blkno,
3335 u64 t_blkno,
3336 int t_is_new)
3337{
3338 int ret, i;
3339 int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3340 int blocksize = inode->i_sb->s_blocksize;
3341 struct buffer_head **s_bhs, **t_bhs = NULL;
3342
3343 BUG_ON(s_blkno == t_blkno);
3344
3345 mlog(0, "cp bucket %llu to %llu, target is %d\n",
3346 s_blkno, t_blkno, t_is_new);
3347
3348 s_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
3349 GFP_NOFS);
3350 if (!s_bhs)
3351 return -ENOMEM;
3352
3353 ret = ocfs2_read_xattr_bucket(inode, s_blkno, s_bhs, 0);
3354 if (ret)
3355 goto out;
3356
3357 t_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
3358 GFP_NOFS);
3359 if (!t_bhs) {
3360 ret = -ENOMEM;
3361 goto out;
3362 }
3363
3364 ret = ocfs2_read_xattr_bucket(inode, t_blkno, t_bhs, t_is_new);
3365 if (ret)
3366 goto out;
3367
3368 for (i = 0; i < blk_per_bucket; i++) {
3369 ret = ocfs2_journal_access(handle, inode, t_bhs[i],
3370 OCFS2_JOURNAL_ACCESS_WRITE);
3371 if (ret)
3372 goto out;
3373 }
3374
3375 for (i = 0; i < blk_per_bucket; i++) {
3376 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);
3377 ocfs2_journal_dirty(handle, t_bhs[i]);
3378 }
3379
3380out:
3381 if (s_bhs) {
3382 for (i = 0; i < blk_per_bucket; i++)
3383 brelse(s_bhs[i]);
3384 }
3385 kfree(s_bhs);
3386
3387 if (t_bhs) {
3388 for (i = 0; i < blk_per_bucket; i++)
3389 brelse(t_bhs[i]);
3390 }
3391 kfree(t_bhs);
3392
3393 return ret;
3394}
3395
3396/*
3397 * Copy one xattr cluster from src_blk to to_blk.
3398 * The to_blk will become the first bucket header of the cluster, so its
3399 * xh_num_buckets will be initialized as the bucket num in the cluster.
3400 */
3401static int ocfs2_cp_xattr_cluster(struct inode *inode,
3402 handle_t *handle,
3403 struct buffer_head *first_bh,
3404 u64 src_blk,
3405 u64 to_blk,
3406 u32 *first_hash)
3407{
3408 int i, ret, credits;
3409 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3410 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3411 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
3412 struct buffer_head *bh = NULL;
3413 struct ocfs2_xattr_header *xh;
3414 u64 to_blk_start = to_blk;
3415
3416 mlog(0, "cp xattrs from cluster %llu to %llu\n", src_blk, to_blk);
3417
3418 /*
3419 * We need to update the new cluster and 1 more for the update of
3420 * the 1st bucket of the previous extent rec.
3421 */
3422 credits = bpc + 1;
3423 ret = ocfs2_extend_trans(handle, credits);
3424 if (ret) {
3425 mlog_errno(ret);
3426 goto out;
3427 }
3428
3429 ret = ocfs2_journal_access(handle, inode, first_bh,
3430 OCFS2_JOURNAL_ACCESS_WRITE);
3431 if (ret) {
3432 mlog_errno(ret);
3433 goto out;
3434 }
3435
3436 for (i = 0; i < num_buckets; i++) {
3437 ret = ocfs2_cp_xattr_bucket(inode, handle,
3438 src_blk, to_blk, 1);
3439 if (ret) {
3440 mlog_errno(ret);
3441 goto out;
3442 }
3443
3444 src_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3445 to_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3446 }
3447
3448 /* update the old bucket header. */
3449 xh = (struct ocfs2_xattr_header *)first_bh->b_data;
3450 le16_add_cpu(&xh->xh_num_buckets, -num_buckets);
3451
3452 ocfs2_journal_dirty(handle, first_bh);
3453
3454 /* update the new bucket header. */
3455 ret = ocfs2_read_block(osb, to_blk_start, &bh, OCFS2_BH_CACHED, inode);
3456 if (ret < 0) {
3457 mlog_errno(ret);
3458 goto out;
3459 }
3460
3461 ret = ocfs2_journal_access(handle, inode, bh,
3462 OCFS2_JOURNAL_ACCESS_WRITE);
3463 if (ret) {
3464 mlog_errno(ret);
3465 goto out;
3466 }
3467
3468 xh = (struct ocfs2_xattr_header *)bh->b_data;
3469 xh->xh_num_buckets = cpu_to_le16(num_buckets);
3470
3471 ocfs2_journal_dirty(handle, bh);
3472
3473 if (first_hash)
3474 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3475out:
3476 brelse(bh);
3477 return ret;
3478}
3479
3480/*
3481 * Move half of the xattrs in this cluster to the new cluster.
3482 * This function should only be called when bucket size == cluster size.
3483 * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
3484 */
3485static int ocfs2_half_xattr_cluster(struct inode *inode,
3486 handle_t *handle,
3487 u64 prev_blk,
3488 u64 new_blk,
3489 u32 *first_hash)
3490{
3491 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3492 int ret, credits = 2 * blk_per_bucket;
3493
3494 BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
3495
3496 ret = ocfs2_extend_trans(handle, credits);
3497 if (ret) {
3498 mlog_errno(ret);
3499 return ret;
3500 }
3501
3502 /* Move half of the xattr in start_blk to the next bucket. */
3503 return ocfs2_half_xattr_bucket(inode, handle, prev_blk,
3504 new_blk, first_hash, 1);
3505}
3506
3507/*
3508 * Move some xattrs from the old cluster to the new one since they are not
3509 * contiguous in ocfs2 xattr tree.
3510 *
3511 * new_blk starts a new separate cluster, and we will move some xattrs from
3512 * prev_blk to it. v_start will be set as the first name hash value in this
3513 * new cluster so that it can be used as e_cpos during tree insertion and
3514 * don't collide with our original b-tree operations. first_bh and header_bh
3515 * will also be updated since they will be used in ocfs2_extend_xattr_bucket
3516 * to extend the insert bucket.
3517 *
3518 * The problem is how much xattr should we move to the new one and when should
3519 * we update first_bh and header_bh?
3520 * 1. If cluster size > bucket size, that means the previous cluster has more
3521 * than 1 bucket, so just move half nums of bucket into the new cluster and
3522 * update the first_bh and header_bh if the insert bucket has been moved
3523 * to the new cluster.
3524 * 2. If cluster_size == bucket_size:
3525 * a) If the previous extent rec has more than one cluster and the insert
3526 * place isn't in the last cluster, copy the entire last cluster to the
3527 * new one. This time, we don't need to upate the first_bh and header_bh
3528 * since they will not be moved into the new cluster.
3529 * b) Otherwise, move the bottom half of the xattrs in the last cluster into
3530 * the new one. And we set the extend flag to zero if the insert place is
3531 * moved into the new allocated cluster since no extend is needed.
3532 */
3533static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
3534 handle_t *handle,
3535 struct buffer_head **first_bh,
3536 struct buffer_head **header_bh,
3537 u64 new_blk,
3538 u64 prev_blk,
3539 u32 prev_clusters,
3540 u32 *v_start,
3541 int *extend)
3542{
3543 int ret = 0;
3544 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3545
3546 mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n",
3547 prev_blk, prev_clusters, new_blk);
3548
3549 if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1)
3550 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
3551 handle,
3552 first_bh,
3553 header_bh,
3554 new_blk,
3555 prev_blk,
3556 prev_clusters,
3557 v_start);
3558 else {
3559 u64 last_blk = prev_blk + bpc * (prev_clusters - 1);
3560
3561 if (prev_clusters > 1 && (*header_bh)->b_blocknr != last_blk)
3562 ret = ocfs2_cp_xattr_cluster(inode, handle, *first_bh,
3563 last_blk, new_blk,
3564 v_start);
3565 else {
3566 ret = ocfs2_half_xattr_cluster(inode, handle,
3567 last_blk, new_blk,
3568 v_start);
3569
3570 if ((*header_bh)->b_blocknr == last_blk && extend)
3571 *extend = 0;
3572 }
3573 }
3574
3575 return ret;
3576}
3577
3578/*
3579 * Add a new cluster for xattr storage.
3580 *
3581 * If the new cluster is contiguous with the previous one, it will be
3582 * appended to the same extent record, and num_clusters will be updated.
3583 * If not, we will insert a new extent for it and move some xattrs in
3584 * the last cluster into the new allocated one.
3585 * We also need to limit the maximum size of a btree leaf, otherwise we'll
3586 * lose the benefits of hashing because we'll have to search large leaves.
3587 * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
3588 * if it's bigger).
3589 *
3590 * first_bh is the first block of the previous extent rec and header_bh
3591 * indicates the bucket we will insert the new xattrs. They will be updated
3592 * when the header_bh is moved into the new cluster.
3593 */
3594static int ocfs2_add_new_xattr_cluster(struct inode *inode,
3595 struct buffer_head *root_bh,
3596 struct buffer_head **first_bh,
3597 struct buffer_head **header_bh,
3598 u32 *num_clusters,
3599 u32 prev_cpos,
3600 u64 prev_blkno,
3601 int *extend)
3602{
3603 int ret, credits;
3604 u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3605 u32 prev_clusters = *num_clusters;
3606 u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
3607 u64 block;
3608 handle_t *handle = NULL;
3609 struct ocfs2_alloc_context *data_ac = NULL;
3610 struct ocfs2_alloc_context *meta_ac = NULL;
3611 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3612 struct ocfs2_xattr_block *xb =
3613 (struct ocfs2_xattr_block *)root_bh->b_data;
3614 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3615 struct ocfs2_extent_list *root_el = &xb_root->xt_list;
3616 enum ocfs2_extent_tree_type type = OCFS2_XATTR_TREE_EXTENT;
3617
3618 mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, "
3619 "previous xattr blkno = %llu\n",
3620 (unsigned long long)OCFS2_I(inode)->ip_blkno,
3621 prev_cpos, prev_blkno);
3622
3623 ret = ocfs2_lock_allocators(inode, root_bh, root_el,
3624 clusters_to_add, 0, &data_ac,
3625 &meta_ac, type, NULL);
3626 if (ret) {
3627 mlog_errno(ret);
3628 goto leave;
3629 }
3630
3631 credits = ocfs2_calc_extend_credits(osb->sb, root_el, clusters_to_add);
3632 handle = ocfs2_start_trans(osb, credits);
3633 if (IS_ERR(handle)) {
3634 ret = PTR_ERR(handle);
3635 handle = NULL;
3636 mlog_errno(ret);
3637 goto leave;
3638 }
3639
3640 ret = ocfs2_journal_access(handle, inode, root_bh,
3641 OCFS2_JOURNAL_ACCESS_WRITE);
3642 if (ret < 0) {
3643 mlog_errno(ret);
3644 goto leave;
3645 }
3646
3647 ret = __ocfs2_claim_clusters(osb, handle, data_ac, 1,
3648 clusters_to_add, &bit_off, &num_bits);
3649 if (ret < 0) {
3650 if (ret != -ENOSPC)
3651 mlog_errno(ret);
3652 goto leave;
3653 }
3654
3655 BUG_ON(num_bits > clusters_to_add);
3656
3657 block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
3658 mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n",
3659 num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
3660
3661 if (prev_blkno + prev_clusters * bpc == block &&
3662 (prev_clusters + num_bits) << osb->s_clustersize_bits <=
3663 OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
3664 /*
3665 * If this cluster is contiguous with the old one and
3666 * adding this new cluster, we don't surpass the limit of
3667 * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
3668 * initialized and used like other buckets in the previous
3669 * cluster.
3670 * So add it as a contiguous one. The caller will handle
3671 * its init process.
3672 */
3673 v_start = prev_cpos + prev_clusters;
3674 *num_clusters = prev_clusters + num_bits;
3675 mlog(0, "Add contiguous %u clusters to previous extent rec.\n",
3676 num_bits);
3677 } else {
3678 ret = ocfs2_adjust_xattr_cross_cluster(inode,
3679 handle,
3680 first_bh,
3681 header_bh,
3682 block,
3683 prev_blkno,
3684 prev_clusters,
3685 &v_start,
3686 extend);
3687 if (ret) {
3688 mlog_errno(ret);
3689 goto leave;
3690 }
3691 }
3692
3693 mlog(0, "Insert %u clusters at block %llu for xattr at %u\n",
3694 num_bits, block, v_start);
3695 ret = ocfs2_xattr_tree_insert_extent(osb, handle, inode, root_bh,
3696 v_start, block, num_bits,
3697 0, meta_ac);
3698 if (ret < 0) {
3699 mlog_errno(ret);
3700 goto leave;
3701 }
3702
3703 ret = ocfs2_journal_dirty(handle, root_bh);
3704 if (ret < 0) {
3705 mlog_errno(ret);
3706 goto leave;
3707 }
3708
3709leave:
3710 if (handle)
3711 ocfs2_commit_trans(osb, handle);
3712 if (data_ac)
3713 ocfs2_free_alloc_context(data_ac);
3714 if (meta_ac)
3715 ocfs2_free_alloc_context(meta_ac);
3716
3717 return ret;
3718}
3719
3720/*
3721 * Extend a new xattr bucket and move xattrs to the end one by one until
3722 * We meet with start_bh. Only move half of the xattrs to the bucket after it.
3723 */
3724static int ocfs2_extend_xattr_bucket(struct inode *inode,
3725 struct buffer_head *first_bh,
3726 struct buffer_head *start_bh,
3727 u32 num_clusters)
3728{
3729 int ret, credits;
3730 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3731 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3732 u64 start_blk = start_bh->b_blocknr, end_blk;
3733 u32 num_buckets = num_clusters * ocfs2_xattr_buckets_per_cluster(osb);
3734 handle_t *handle;
3735 struct ocfs2_xattr_header *first_xh =
3736 (struct ocfs2_xattr_header *)first_bh->b_data;
3737 u16 bucket = le16_to_cpu(first_xh->xh_num_buckets);
3738
3739 mlog(0, "extend xattr bucket in %llu, xattr extend rec starting "
3740 "from %llu, len = %u\n", start_blk,
3741 (unsigned long long)first_bh->b_blocknr, num_clusters);
3742
3743 BUG_ON(bucket >= num_buckets);
3744
3745 end_blk = first_bh->b_blocknr + (bucket - 1) * blk_per_bucket;
3746
3747 /*
3748 * We will touch all the buckets after the start_bh(include it).
3749 * Add one more bucket and modify the first_bh.
3750 */
3751 credits = end_blk - start_blk + 2 * blk_per_bucket + 1;
3752 handle = ocfs2_start_trans(osb, credits);
3753 if (IS_ERR(handle)) {
3754 ret = PTR_ERR(handle);
3755 handle = NULL;
3756 mlog_errno(ret);
3757 goto out;
3758 }
3759
3760 ret = ocfs2_journal_access(handle, inode, first_bh,
3761 OCFS2_JOURNAL_ACCESS_WRITE);
3762 if (ret) {
3763 mlog_errno(ret);
3764 goto commit;
3765 }
3766
3767 while (end_blk != start_blk) {
3768 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
3769 end_blk + blk_per_bucket, 0);
3770 if (ret)
3771 goto commit;
3772 end_blk -= blk_per_bucket;
3773 }
3774
3775 /* Move half of the xattr in start_blk to the next bucket. */
3776 ret = ocfs2_half_xattr_bucket(inode, handle, start_blk,
3777 start_blk + blk_per_bucket, NULL, 0);
3778
3779 le16_add_cpu(&first_xh->xh_num_buckets, 1);
3780 ocfs2_journal_dirty(handle, first_bh);
3781
3782commit:
3783 ocfs2_commit_trans(osb, handle);
3784out:
3785 return ret;
3786}
3787
3788/*
3789 * Add new xattr bucket in an extent record and adjust the buckets accordingly.
3790 * xb_bh is the ocfs2_xattr_block.
3791 * We will move all the buckets starting from header_bh to the next place. As
3792 * for this one, half num of its xattrs will be moved to the next one.
3793 *
3794 * We will allocate a new cluster if current cluster is full and adjust
3795 * header_bh and first_bh if the insert place is moved to the new cluster.
3796 */
3797static int ocfs2_add_new_xattr_bucket(struct inode *inode,
3798 struct buffer_head *xb_bh,
3799 struct buffer_head *header_bh)
3800{
3801 struct ocfs2_xattr_header *first_xh = NULL;
3802 struct buffer_head *first_bh = NULL;
3803 struct ocfs2_xattr_block *xb =
3804 (struct ocfs2_xattr_block *)xb_bh->b_data;
3805 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3806 struct ocfs2_extent_list *el = &xb_root->xt_list;
3807 struct ocfs2_xattr_header *xh =
3808 (struct ocfs2_xattr_header *)header_bh->b_data;
3809 u32 name_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3810 struct super_block *sb = inode->i_sb;
3811 struct ocfs2_super *osb = OCFS2_SB(sb);
3812 int ret, num_buckets, extend = 1;
3813 u64 p_blkno;
3814 u32 e_cpos, num_clusters;
3815
3816 mlog(0, "Add new xattr bucket starting form %llu\n",
3817 (unsigned long long)header_bh->b_blocknr);
3818
3819 /*
3820 * Add refrence for header_bh here because it may be
3821 * changed in ocfs2_add_new_xattr_cluster and we need
3822 * to free it in the end.
3823 */
3824 get_bh(header_bh);
3825
3826 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
3827 &num_clusters, el);
3828 if (ret) {
3829 mlog_errno(ret);
3830 goto out;
3831 }
3832
3833 ret = ocfs2_read_block(osb, p_blkno,
3834 &first_bh, OCFS2_BH_CACHED, inode);
3835 if (ret) {
3836 mlog_errno(ret);
3837 goto out;
3838 }
3839
3840 num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
3841 first_xh = (struct ocfs2_xattr_header *)first_bh->b_data;
3842
3843 if (num_buckets == le16_to_cpu(first_xh->xh_num_buckets)) {
3844 ret = ocfs2_add_new_xattr_cluster(inode,
3845 xb_bh,
3846 &first_bh,
3847 &header_bh,
3848 &num_clusters,
3849 e_cpos,
3850 p_blkno,
3851 &extend);
3852 if (ret) {
3853 mlog_errno(ret);
3854 goto out;
3855 }
3856 }
3857
3858 if (extend)
3859 ret = ocfs2_extend_xattr_bucket(inode,
3860 first_bh,
3861 header_bh,
3862 num_clusters);
3863 if (ret)
3864 mlog_errno(ret);
3865out:
3866 brelse(first_bh);
3867 brelse(header_bh);
3868 return ret;
3869}
3870
3871static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode,
3872 struct ocfs2_xattr_bucket *bucket,
3873 int offs)
3874{
3875 int block_off = offs >> inode->i_sb->s_blocksize_bits;
3876
3877 offs = offs % inode->i_sb->s_blocksize;
3878 return bucket->bhs[block_off]->b_data + offs;
3879}
3880
3881/*
3882 * Handle the normal xattr set, including replace, delete and new.
3883 * When the bucket is empty, "is_empty" is set and the caller can
3884 * free this bucket.
3885 *
3886 * Note: "local" indicates the real data's locality. So we can't
3887 * just its bucket locality by its length.
3888 */
3889static void ocfs2_xattr_set_entry_normal(struct inode *inode,
3890 struct ocfs2_xattr_info *xi,
3891 struct ocfs2_xattr_search *xs,
3892 u32 name_hash,
3893 int local,
3894 int *is_empty)
3895{
3896 struct ocfs2_xattr_entry *last, *xe;
3897 int name_len = strlen(xi->name);
3898 struct ocfs2_xattr_header *xh = xs->header;
3899 u16 count = le16_to_cpu(xh->xh_count), start;
3900 size_t blocksize = inode->i_sb->s_blocksize;
3901 char *val;
3902 size_t offs, size, new_size;
3903
3904 last = &xh->xh_entries[count];
3905 if (!xs->not_found) {
3906 xe = xs->here;
3907 offs = le16_to_cpu(xe->xe_name_offset);
3908 if (ocfs2_xattr_is_local(xe))
3909 size = OCFS2_XATTR_SIZE(name_len) +
3910 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3911 else
3912 size = OCFS2_XATTR_SIZE(name_len) +
3913 OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
3914
3915 /*
3916 * If the new value will be stored outside, xi->value has been
3917 * initalized as an empty ocfs2_xattr_value_root, and the same
3918 * goes with xi->value_len, so we can set new_size safely here.
3919 * See ocfs2_xattr_set_in_bucket.
3920 */
3921 new_size = OCFS2_XATTR_SIZE(name_len) +
3922 OCFS2_XATTR_SIZE(xi->value_len);
3923
3924 le16_add_cpu(&xh->xh_name_value_len, -size);
3925 if (xi->value) {
3926 if (new_size > size)
3927 goto set_new_name_value;
3928
3929 /* Now replace the old value with new one. */
3930 if (local)
3931 xe->xe_value_size = cpu_to_le64(xi->value_len);
3932 else
3933 xe->xe_value_size = 0;
3934
3935 val = ocfs2_xattr_bucket_get_val(inode,
3936 &xs->bucket, offs);
3937 memset(val + OCFS2_XATTR_SIZE(name_len), 0,
3938 size - OCFS2_XATTR_SIZE(name_len));
3939 if (OCFS2_XATTR_SIZE(xi->value_len) > 0)
3940 memcpy(val + OCFS2_XATTR_SIZE(name_len),
3941 xi->value, xi->value_len);
3942
3943 le16_add_cpu(&xh->xh_name_value_len, new_size);
3944 ocfs2_xattr_set_local(xe, local);
3945 return;
3946 } else {
3947 /* Remove the old entry. */
3948 last -= 1;
3949 memmove(xe, xe + 1,
3950 (void *)last - (void *)xe);
3951 memset(last, 0, sizeof(struct ocfs2_xattr_entry));
3952 le16_add_cpu(&xh->xh_count, -1);
3953 if (xh->xh_count == 0 && is_empty)
3954 *is_empty = 1;
3955 return;
3956 }
3957 } else {
3958 /* find a new entry for insert. */
3959 int low = 0, high = count - 1, tmp;
3960 struct ocfs2_xattr_entry *tmp_xe;
3961
3962 while (low <= high) {
3963 tmp = (low + high) / 2;
3964 tmp_xe = &xh->xh_entries[tmp];
3965
3966 if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
3967 low = tmp + 1;
3968 else if (name_hash <
3969 le32_to_cpu(tmp_xe->xe_name_hash))
3970 high = tmp - 1;
3971 else
3972 break;
3973 }
3974
3975 xe = &xh->xh_entries[low];
3976 if (low != count)
3977 memmove(xe + 1, xe, (void *)last - (void *)xe);
3978
3979 le16_add_cpu(&xh->xh_count, 1);
3980 memset(xe, 0, sizeof(struct ocfs2_xattr_entry));
3981 xe->xe_name_hash = cpu_to_le32(name_hash);
3982 xe->xe_name_len = name_len;
3983 ocfs2_xattr_set_type(xe, xi->name_index);
3984 }
3985
3986set_new_name_value:
3987 /* Insert the new name+value. */
3988 size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len);
3989
3990 /*
3991 * We must make sure that the name/value pair
3992 * exists in the same block.
3993 */
3994 offs = le16_to_cpu(xh->xh_free_start);
3995 start = offs - size;
3996
3997 if (start >> inode->i_sb->s_blocksize_bits !=
3998 (offs - 1) >> inode->i_sb->s_blocksize_bits) {
3999 offs = offs - offs % blocksize;
4000 xh->xh_free_start = cpu_to_le16(offs);
4001 }
4002
4003 val = ocfs2_xattr_bucket_get_val(inode,
4004 &xs->bucket, offs - size);
4005 xe->xe_name_offset = cpu_to_le16(offs - size);
4006
4007 memset(val, 0, size);
4008 memcpy(val, xi->name, name_len);
4009 memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len);
4010
4011 xe->xe_value_size = cpu_to_le64(xi->value_len);
4012 ocfs2_xattr_set_local(xe, local);
4013 xs->here = xe;
4014 le16_add_cpu(&xh->xh_free_start, -size);
4015 le16_add_cpu(&xh->xh_name_value_len, size);
4016
4017 return;
4018}
4019
4020static int ocfs2_xattr_bucket_handle_journal(struct inode *inode,
4021 handle_t *handle,
4022 struct ocfs2_xattr_search *xs,
4023 struct buffer_head **bhs,
4024 u16 bh_num)
4025{
4026 int ret = 0, off, block_off;
4027 struct ocfs2_xattr_entry *xe = xs->here;
4028
4029 /*
4030 * First calculate all the blocks we should journal_access
4031 * and journal_dirty. The first block should always be touched.
4032 */
4033 ret = ocfs2_journal_dirty(handle, bhs[0]);
4034 if (ret)
4035 mlog_errno(ret);
4036
4037 /* calc the data. */
4038 off = le16_to_cpu(xe->xe_name_offset);
4039 block_off = off >> inode->i_sb->s_blocksize_bits;
4040 ret = ocfs2_journal_dirty(handle, bhs[block_off]);
4041 if (ret)
4042 mlog_errno(ret);
4043
4044 return ret;
4045}
4046
4047/*
4048 * Set the xattr entry in the specified bucket.
4049 * The bucket is indicated by xs->bucket and it should have the enough
4050 * space for the xattr insertion.
4051 */
4052static int ocfs2_xattr_set_entry_in_bucket(struct inode *inode,
4053 struct ocfs2_xattr_info *xi,
4054 struct ocfs2_xattr_search *xs,
4055 u32 name_hash,
4056 int local,
4057 int *bucket_empty)
4058{
4059 int i, ret;
4060 handle_t *handle = NULL;
4061 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4062 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4063
4064 mlog(0, "Set xattr entry len = %d index = %d in bucket %llu\n",
4065 xi->value_len, xi->name_index,
4066 (unsigned long long)xs->bucket.bhs[0]->b_blocknr);
4067
4068 if (!xs->bucket.bhs[1]) {
4069 ret = ocfs2_read_blocks(osb,
4070 xs->bucket.bhs[0]->b_blocknr + 1,
4071 blk_per_bucket - 1, &xs->bucket.bhs[1],
4072 OCFS2_BH_CACHED, inode);
4073 if (ret) {
4074 mlog_errno(ret);
4075 goto out;
4076 }
4077 }
4078
4079 handle = ocfs2_start_trans(osb, blk_per_bucket);
4080 if (IS_ERR(handle)) {
4081 ret = PTR_ERR(handle);
4082 handle = NULL;
4083 mlog_errno(ret);
4084 goto out;
4085 }
4086
4087 for (i = 0; i < blk_per_bucket; i++) {
4088 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[i],
4089 OCFS2_JOURNAL_ACCESS_WRITE);
4090 if (ret < 0) {
4091 mlog_errno(ret);
4092 goto out;
4093 }
4094 }
4095
4096 ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash,
4097 local, bucket_empty);
4098
4099 /*Only dirty the blocks we have touched in set xattr. */
4100 ret = ocfs2_xattr_bucket_handle_journal(inode, handle, xs,
4101 xs->bucket.bhs, blk_per_bucket);
4102 if (ret)
4103 mlog_errno(ret);
4104out:
4105 ocfs2_commit_trans(osb, handle);
4106
4107 return ret;
4108}
4109
4110static int ocfs2_xattr_value_update_size(struct inode *inode,
4111 struct buffer_head *xe_bh,
4112 struct ocfs2_xattr_entry *xe,
4113 u64 new_size)
4114{
4115 int ret;
4116 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4117 handle_t *handle = NULL;
4118
4119 handle = ocfs2_start_trans(osb, 1);
4120 if (handle == NULL) {
4121 ret = -ENOMEM;
4122 mlog_errno(ret);
4123 goto out;
4124 }
4125
4126 ret = ocfs2_journal_access(handle, inode, xe_bh,
4127 OCFS2_JOURNAL_ACCESS_WRITE);
4128 if (ret < 0) {
4129 mlog_errno(ret);
4130 goto out_commit;
4131 }
4132
4133 xe->xe_value_size = cpu_to_le64(new_size);
4134
4135 ret = ocfs2_journal_dirty(handle, xe_bh);
4136 if (ret < 0)
4137 mlog_errno(ret);
4138
4139out_commit:
4140 ocfs2_commit_trans(osb, handle);
4141out:
4142 return ret;
4143}
4144
4145/*
4146 * Truncate the specified xe_off entry in xattr bucket.
4147 * bucket is indicated by header_bh and len is the new length.
4148 * Both the ocfs2_xattr_value_root and the entry will be updated here.
4149 *
4150 * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
4151 */
4152static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
4153 struct buffer_head *header_bh,
4154 int xe_off,
4155 int len)
4156{
4157 int ret, offset;
4158 u64 value_blk;
4159 struct buffer_head *value_bh = NULL;
4160 struct ocfs2_xattr_value_root *xv;
4161 struct ocfs2_xattr_entry *xe;
4162 struct ocfs2_xattr_header *xh =
4163 (struct ocfs2_xattr_header *)header_bh->b_data;
4164 size_t blocksize = inode->i_sb->s_blocksize;
4165
4166 xe = &xh->xh_entries[xe_off];
4167
4168 BUG_ON(!xe || ocfs2_xattr_is_local(xe));
4169
4170 offset = le16_to_cpu(xe->xe_name_offset) +
4171 OCFS2_XATTR_SIZE(xe->xe_name_len);
4172
4173 value_blk = offset / blocksize;
4174
4175 /* We don't allow ocfs2_xattr_value to be stored in different block. */
4176 BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
4177 value_blk += header_bh->b_blocknr;
4178
4179 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), value_blk,
4180 &value_bh, OCFS2_BH_CACHED, inode);
4181 if (ret) {
4182 mlog_errno(ret);
4183 goto out;
4184 }
4185
4186 xv = (struct ocfs2_xattr_value_root *)
4187 (value_bh->b_data + offset % blocksize);
4188
4189 mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n",
4190 xe_off, (unsigned long long)header_bh->b_blocknr, len);
4191 ret = ocfs2_xattr_value_truncate(inode, value_bh, xv, len);
4192 if (ret) {
4193 mlog_errno(ret);
4194 goto out;
4195 }
4196
4197 ret = ocfs2_xattr_value_update_size(inode, header_bh, xe, len);
4198 if (ret) {
4199 mlog_errno(ret);
4200 goto out;
4201 }
4202
4203out:
4204 brelse(value_bh);
4205 return ret;
4206}
4207
4208static int ocfs2_xattr_bucket_value_truncate_xs(struct inode *inode,
4209 struct ocfs2_xattr_search *xs,
4210 int len)
4211{
4212 int ret, offset;
4213 struct ocfs2_xattr_entry *xe = xs->here;
4214 struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xs->base;
4215
4216 BUG_ON(!xs->bucket.bhs[0] || !xe || ocfs2_xattr_is_local(xe));
4217
4218 offset = xe - xh->xh_entries;
4219 ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket.bhs[0],
4220 offset, len);
4221 if (ret)
4222 mlog_errno(ret);
4223
4224 return ret;
4225}
4226
4227static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode,
4228 struct ocfs2_xattr_search *xs,
4229 char *val,
4230 int value_len)
4231{
4232 int offset;
4233 struct ocfs2_xattr_value_root *xv;
4234 struct ocfs2_xattr_entry *xe = xs->here;
4235
4236 BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe));
4237
4238 offset = le16_to_cpu(xe->xe_name_offset) +
4239 OCFS2_XATTR_SIZE(xe->xe_name_len);
4240
4241 xv = (struct ocfs2_xattr_value_root *)(xs->base + offset);
4242
4243 return __ocfs2_xattr_set_value_outside(inode, xv, val, value_len);
4244}
4245
4246/*
4247 * Remove the xattr bucket pointed by bucket_bh.
4248 * All the buckets after it in the same xattr extent rec will be
4249 * move forward one by one.
4250 */
4251static int ocfs2_rm_xattr_bucket(struct inode *inode,
4252 struct buffer_head *first_bh,
4253 struct ocfs2_xattr_bucket *bucket)
4254{
4255 int ret = 0, credits;
4256 struct ocfs2_xattr_header *xh =
4257 (struct ocfs2_xattr_header *)first_bh->b_data;
4258 u16 bucket_num = le16_to_cpu(xh->xh_num_buckets);
4259 u64 end, start = bucket->bhs[0]->b_blocknr;
4260 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4261 handle_t *handle;
4262 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4263
4264 end = first_bh->b_blocknr + (bucket_num - 1) * blk_per_bucket;
4265
4266 mlog(0, "rm xattr bucket %llu\n", start);
4267 /*
4268 * We need to update the first xattr_header and all the buckets starting
4269 * from start in this xattr rec.
4270 *
4271 * XXX: Should we empty the old last bucket here?
4272 */
4273 credits = 1 + end - start;
4274 handle = ocfs2_start_trans(osb, credits);
4275 if (IS_ERR(handle)) {
4276 ret = PTR_ERR(handle);
4277 mlog_errno(ret);
4278 return ret;
4279 }
4280
4281 ret = ocfs2_journal_access(handle, inode, first_bh,
4282 OCFS2_JOURNAL_ACCESS_WRITE);
4283 if (ret) {
4284 mlog_errno(ret);
4285 goto out_commit;
4286 }
4287
4288
4289 while (start < end) {
4290 ret = ocfs2_cp_xattr_bucket(inode, handle,
4291 start + blk_per_bucket,
4292 start, 0);
4293 if (ret) {
4294 mlog_errno(ret);
4295 goto out_commit;
4296 }
4297 start += blk_per_bucket;
4298 }
4299
4300 /* update the first_bh. */
4301 xh->xh_num_buckets = cpu_to_le16(bucket_num - 1);
4302 ocfs2_journal_dirty(handle, first_bh);
4303
4304out_commit:
4305 ocfs2_commit_trans(osb, handle);
4306 return ret;
4307}
4308
4309static int ocfs2_rm_xattr_cluster(struct inode *inode,
4310 struct buffer_head *root_bh,
4311 u64 blkno,
4312 u32 cpos,
4313 u32 len)
4314{
4315 int ret;
4316 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4317 struct inode *tl_inode = osb->osb_tl_inode;
4318 handle_t *handle;
4319 struct ocfs2_xattr_block *xb =
4320 (struct ocfs2_xattr_block *)root_bh->b_data;
4321 struct ocfs2_extent_list *root_el = &xb->xb_attrs.xb_root.xt_list;
4322 struct ocfs2_alloc_context *meta_ac = NULL;
4323 struct ocfs2_cached_dealloc_ctxt dealloc;
4324
4325 ocfs2_init_dealloc_ctxt(&dealloc);
4326
4327 mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n",
4328 cpos, len, (unsigned long long)blkno);
4329
4330 ocfs2_remove_xattr_clusters_from_cache(inode, blkno, len);
4331
4332 ret = ocfs2_lock_allocators(inode, root_bh, root_el,
4333 0, 1, NULL, &meta_ac,
4334 OCFS2_XATTR_TREE_EXTENT, NULL);
4335 if (ret) {
4336 mlog_errno(ret);
4337 return ret;
4338 }
4339
4340 mutex_lock(&tl_inode->i_mutex);
4341
4342 if (ocfs2_truncate_log_needs_flush(osb)) {
4343 ret = __ocfs2_flush_truncate_log(osb);
4344 if (ret < 0) {
4345 mlog_errno(ret);
4346 goto out;
4347 }
4348 }
4349
4350 handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
4351 if (handle == NULL) {
4352 ret = -ENOMEM;
4353 mlog_errno(ret);
4354 goto out;
4355 }
4356
4357 ret = ocfs2_journal_access(handle, inode, root_bh,
4358 OCFS2_JOURNAL_ACCESS_WRITE);
4359 if (ret) {
4360 mlog_errno(ret);
4361 goto out_commit;
4362 }
4363
4364 ret = ocfs2_remove_extent(inode, root_bh, cpos, len, handle, meta_ac,
4365 &dealloc, OCFS2_XATTR_TREE_EXTENT, NULL);
4366 if (ret) {
4367 mlog_errno(ret);
4368 goto out_commit;
4369 }
4370
4371 le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
4372
4373 ret = ocfs2_journal_dirty(handle, root_bh);
4374 if (ret) {
4375 mlog_errno(ret);
4376 goto out_commit;
4377 }
4378
4379 ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
4380 if (ret)
4381 mlog_errno(ret);
4382
4383out_commit:
4384 ocfs2_commit_trans(osb, handle);
4385out:
4386 ocfs2_schedule_truncate_log_flush(osb, 1);
4387
4388 mutex_unlock(&tl_inode->i_mutex);
4389
4390 if (meta_ac)
4391 ocfs2_free_alloc_context(meta_ac);
4392
4393 ocfs2_run_deallocs(osb, &dealloc);
4394
4395 return ret;
4396}
4397
4398/*
4399 * Free the xattr bucket indicated by xs->bucket and if all the buckets
4400 * in the clusters is free, free the clusters also.
4401 */
4402static int ocfs2_xattr_bucket_shrink(struct inode *inode,
4403 struct ocfs2_xattr_info *xi,
4404 struct ocfs2_xattr_search *xs,
4405 u32 name_hash)
4406{
4407 int ret;
4408 u32 e_cpos, num_clusters;
4409 u64 p_blkno;
4410 struct buffer_head *first_bh = NULL;
4411 struct ocfs2_xattr_header *first_xh;
4412 struct ocfs2_xattr_block *xb =
4413 (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
4414
4415 BUG_ON(xs->header->xh_count != 0);
4416
4417 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
4418 &e_cpos, &num_clusters,
4419 &xb->xb_attrs.xb_root.xt_list);
4420 if (ret) {
4421 mlog_errno(ret);
4422 return ret;
4423 }
4424
4425 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), p_blkno,
4426 &first_bh, OCFS2_BH_CACHED, inode);
4427 if (ret) {
4428 mlog_errno(ret);
4429 return ret;
4430 }
4431
4432 ret = ocfs2_rm_xattr_bucket(inode, first_bh, &xs->bucket);
4433 if (ret) {
4434 mlog_errno(ret);
4435 goto out;
4436 }
4437
4438 first_xh = (struct ocfs2_xattr_header *)first_bh->b_data;
4439 if (first_xh->xh_num_buckets == 0)
4440 ret = ocfs2_rm_xattr_cluster(inode, xs->xattr_bh,
4441 p_blkno, e_cpos,
4442 num_clusters);
4443
4444out:
4445 brelse(first_bh);
4446 return ret;
4447}
4448
4449static void ocfs2_xattr_bucket_remove_xs(struct inode *inode,
4450 struct ocfs2_xattr_search *xs)
4451{
4452 handle_t *handle = NULL;
4453 struct ocfs2_xattr_header *xh = xs->bucket.xh;
4454 struct ocfs2_xattr_entry *last = &xh->xh_entries[
4455 le16_to_cpu(xh->xh_count) - 1];
4456 int ret = 0;
4457
4458 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1);
4459 if (IS_ERR(handle)) {
4460 ret = PTR_ERR(handle);
4461 mlog_errno(ret);
4462 return;
4463 }
4464
4465 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[0],
4466 OCFS2_JOURNAL_ACCESS_WRITE);
4467 if (ret) {
4468 mlog_errno(ret);
4469 goto out_commit;
4470 }
4471
4472 /* Remove the old entry. */
4473 memmove(xs->here, xs->here + 1,
4474 (void *)last - (void *)xs->here);
4475 memset(last, 0, sizeof(struct ocfs2_xattr_entry));
4476 le16_add_cpu(&xh->xh_count, -1);
4477
4478 ret = ocfs2_journal_dirty(handle, xs->bucket.bhs[0]);
4479 if (ret < 0)
4480 mlog_errno(ret);
4481out_commit:
4482 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
4483}
4484
4485/*
4486 * Set the xattr name/value in the bucket specified in xs.
4487 *
4488 * As the new value in xi may be stored in the bucket or in an outside cluster,
4489 * we divide the whole process into 3 steps:
4490 * 1. insert name/value in the bucket(ocfs2_xattr_set_entry_in_bucket)
4491 * 2. truncate of the outside cluster(ocfs2_xattr_bucket_value_truncate_xs)
4492 * 3. Set the value to the outside cluster(ocfs2_xattr_bucket_set_value_outside)
4493 * 4. If the clusters for the new outside value can't be allocated, we need
4494 * to free the xattr we allocated in set.
4495 */
4496static int ocfs2_xattr_set_in_bucket(struct inode *inode,
4497 struct ocfs2_xattr_info *xi,
4498 struct ocfs2_xattr_search *xs)
4499{
4500 int ret, local = 1, bucket_empty = 0;
4501 size_t value_len;
4502 char *val = (char *)xi->value;
4503 struct ocfs2_xattr_entry *xe = xs->here;
4504 u32 name_hash = ocfs2_xattr_hash_by_name(inode,
4505 xi->name_index, xi->name);
4506
4507 if (!xs->not_found && !ocfs2_xattr_is_local(xe)) {
4508 /*
4509 * We need to truncate the xattr storage first.
4510 *
4511 * If both the old and new value are stored to
4512 * outside block, we only need to truncate
4513 * the storage and then set the value outside.
4514 *
4515 * If the new value should be stored within block,
4516 * we should free all the outside block first and
4517 * the modification to the xattr block will be done
4518 * by following steps.
4519 */
4520 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
4521 value_len = xi->value_len;
4522 else
4523 value_len = 0;
4524
4525 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
4526 value_len);
4527 if (ret)
4528 goto out;
4529
4530 if (value_len)
4531 goto set_value_outside;
4532 }
4533
4534 value_len = xi->value_len;
4535 /* So we have to handle the inside block change now. */
4536 if (value_len > OCFS2_XATTR_INLINE_SIZE) {
4537 /*
4538 * If the new value will be stored outside of block,
4539 * initalize a new empty value root and insert it first.
4540 */
4541 local = 0;
4542 xi->value = &def_xv;
4543 xi->value_len = OCFS2_XATTR_ROOT_SIZE;
4544 }
4545
4546 ret = ocfs2_xattr_set_entry_in_bucket(inode, xi, xs, name_hash,
4547 local, &bucket_empty);
4548 if (ret) {
4549 mlog_errno(ret);
4550 goto out;
4551 }
4552
4553 if (value_len > OCFS2_XATTR_INLINE_SIZE) {
4554 /* allocate the space now for the outside block storage. */
4555 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
4556 value_len);
4557 if (ret) {
4558 mlog_errno(ret);
4559
4560 if (xs->not_found) {
4561 /*
4562 * We can't allocate enough clusters for outside
4563 * storage and we have allocated xattr already,
4564 * so need to remove it.
4565 */
4566 ocfs2_xattr_bucket_remove_xs(inode, xs);
4567 }
4568 goto out;
4569 }
4570 } else {
4571 if (bucket_empty)
4572 ret = ocfs2_xattr_bucket_shrink(inode, xi,
4573 xs, name_hash);
4574 goto out;
4575 }
4576
4577set_value_outside:
4578 ret = ocfs2_xattr_bucket_set_value_outside(inode, xs, val, value_len);
4579out:
4580 return ret;
4581}
4582
4583/* check whether the xattr bucket is filled up with the same hash value. */
4584static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
4585 struct ocfs2_xattr_bucket *bucket)
4586{
4587 struct ocfs2_xattr_header *xh = bucket->xh;
4588
4589 if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
4590 xh->xh_entries[0].xe_name_hash) {
4591 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
4592 "hash = %u\n",
4593 (unsigned long long)bucket->bhs[0]->b_blocknr,
4594 le32_to_cpu(xh->xh_entries[0].xe_name_hash));
4595 return -ENOSPC;
4596 }
4597
4598 return 0;
4599}
4600
4601static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
4602 struct ocfs2_xattr_info *xi,
4603 struct ocfs2_xattr_search *xs)
4604{
4605 struct ocfs2_xattr_header *xh;
4606 struct ocfs2_xattr_entry *xe;
4607 u16 count, header_size, xh_free_start;
4608 int i, free, max_free, need, old;
4609 size_t value_size = 0, name_len = strlen(xi->name);
4610 size_t blocksize = inode->i_sb->s_blocksize;
4611 int ret, allocation = 0;
4612 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4613
4614 mlog_entry("Set xattr %s in xattr index block\n", xi->name);
4615
4616try_again:
4617 xh = xs->header;
4618 count = le16_to_cpu(xh->xh_count);
4619 xh_free_start = le16_to_cpu(xh->xh_free_start);
4620 header_size = sizeof(struct ocfs2_xattr_header) +
4621 count * sizeof(struct ocfs2_xattr_entry);
4622 max_free = OCFS2_XATTR_BUCKET_SIZE -
4623 le16_to_cpu(xh->xh_name_value_len) - header_size;
4624
4625 mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size "
4626 "of %u which exceed block size\n",
4627 (unsigned long long)xs->bucket.bhs[0]->b_blocknr,
4628 header_size);
4629
4630 if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE)
4631 value_size = OCFS2_XATTR_ROOT_SIZE;
4632 else if (xi->value)
4633 value_size = OCFS2_XATTR_SIZE(xi->value_len);
4634
4635 if (xs->not_found)
4636 need = sizeof(struct ocfs2_xattr_entry) +
4637 OCFS2_XATTR_SIZE(name_len) + value_size;
4638 else {
4639 need = value_size + OCFS2_XATTR_SIZE(name_len);
4640
4641 /*
4642 * We only replace the old value if the new length is smaller
4643 * than the old one. Otherwise we will allocate new space in the
4644 * bucket to store it.
4645 */
4646 xe = xs->here;
4647 if (ocfs2_xattr_is_local(xe))
4648 old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
4649 else
4650 old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
4651
4652 if (old >= value_size)
4653 need = 0;
4654 }
4655
4656 free = xh_free_start - header_size;
4657 /*
4658 * We need to make sure the new name/value pair
4659 * can exist in the same block.
4660 */
4661 if (xh_free_start % blocksize < need)
4662 free -= xh_free_start % blocksize;
4663
4664 mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, "
4665 "need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len ="
4666 " %u\n", xs->not_found,
4667 (unsigned long long)xs->bucket.bhs[0]->b_blocknr,
4668 free, need, max_free, le16_to_cpu(xh->xh_free_start),
4669 le16_to_cpu(xh->xh_name_value_len));
4670
4671 if (free < need || count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
4672 if (need <= max_free &&
4673 count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
4674 /*
4675 * We can create the space by defragment. Since only the
4676 * name/value will be moved, the xe shouldn't be changed
4677 * in xs.
4678 */
4679 ret = ocfs2_defrag_xattr_bucket(inode, &xs->bucket);
4680 if (ret) {
4681 mlog_errno(ret);
4682 goto out;
4683 }
4684
4685 xh_free_start = le16_to_cpu(xh->xh_free_start);
4686 free = xh_free_start - header_size;
4687 if (xh_free_start % blocksize < need)
4688 free -= xh_free_start % blocksize;
4689
4690 if (free >= need)
4691 goto xattr_set;
4692
4693 mlog(0, "Can't get enough space for xattr insert by "
4694 "defragment. Need %u bytes, but we have %d, so "
4695 "allocate new bucket for it.\n", need, free);
4696 }
4697
4698 /*
4699 * We have to add new buckets or clusters and one
4700 * allocation should leave us enough space for insert.
4701 */
4702 BUG_ON(allocation);
4703
4704 /*
4705 * We do not allow for overlapping ranges between buckets. And
4706 * the maximum number of collisions we will allow for then is
4707 * one bucket's worth, so check it here whether we need to
4708 * add a new bucket for the insert.
4709 */
4710 ret = ocfs2_check_xattr_bucket_collision(inode, &xs->bucket);
4711 if (ret) {
4712 mlog_errno(ret);
4713 goto out;
4714 }
4715
4716 ret = ocfs2_add_new_xattr_bucket(inode,
4717 xs->xattr_bh,
4718 xs->bucket.bhs[0]);
4719 if (ret) {
4720 mlog_errno(ret);
4721 goto out;
4722 }
4723
4724 for (i = 0; i < blk_per_bucket; i++)
4725 brelse(xs->bucket.bhs[i]);
4726
4727 memset(&xs->bucket, 0, sizeof(xs->bucket));
4728
4729 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
4730 xi->name_index,
4731 xi->name, xs);
4732 if (ret && ret != -ENODATA)
4733 goto out;
4734 xs->not_found = ret;
4735 allocation = 1;
4736 goto try_again;
4737 }
4738
4739xattr_set:
4740 ret = ocfs2_xattr_set_in_bucket(inode, xi, xs);
4741out:
4742 mlog_exit(ret);
4743 return ret;
4744}
a3944256
TM		 4745
4746static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
4747 struct ocfs2_xattr_bucket *bucket,
4748 void *para)
4749{
4750 int ret = 0;
4751 struct ocfs2_xattr_header *xh = bucket->xh;
4752 u16 i;
4753 struct ocfs2_xattr_entry *xe;
4754
4755 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
4756 xe = &xh->xh_entries[i];
4757 if (ocfs2_xattr_is_local(xe))
4758 continue;
4759
4760 ret = ocfs2_xattr_bucket_value_truncate(inode,
4761 bucket->bhs[0],
4762 i, 0);
4763 if (ret) {
4764 mlog_errno(ret);
4765 break;
4766 }
4767 }
4768
4769 return ret;
4770}
4771
4772static int ocfs2_delete_xattr_index_block(struct inode *inode,
4773 struct buffer_head *xb_bh)
4774{
4775 struct ocfs2_xattr_block *xb =
4776 (struct ocfs2_xattr_block *)xb_bh->b_data;
4777 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
4778 int ret = 0;
4779 u32 name_hash = UINT_MAX, e_cpos, num_clusters;
4780 u64 p_blkno;
4781
4782 if (le16_to_cpu(el->l_next_free_rec) == 0)
4783 return 0;
4784
4785 while (name_hash > 0) {
4786 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
4787 &e_cpos, &num_clusters, el);
4788 if (ret) {
4789 mlog_errno(ret);
4790 goto out;
4791 }
4792
4793 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
4794 ocfs2_delete_xattr_in_bucket,
4795 NULL);
4796 if (ret) {
4797 mlog_errno(ret);
4798 goto out;
4799 }
4800
4801 ret = ocfs2_rm_xattr_cluster(inode, xb_bh,
4802 p_blkno, e_cpos, num_clusters);
4803 if (ret) {
4804 mlog_errno(ret);
4805 break;
4806 }
4807
4808 if (e_cpos == 0)
4809 break;
4810
4811 name_hash = e_cpos - 1;
4812 }
4813
4814out:
4815 return ret;
4816}
Linux kernel - Deliverables
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