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ocfs2: Add xattr mount option in ocfs2_show_options()
[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);
f56654c4 209 u32 prev_clusters, logical_start = le32_to_cpu(xv->xr_clusters);
f99b9b7c 210 struct ocfs2_extent_tree et;
f56654c4
TM		 211
212 mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add);
213
8d6220d6 214 ocfs2_init_xattr_value_extent_tree(&et, inode, xattr_bh, xv);
f99b9b7c 215
f56654c4
TM		 216restart_all:
217
f99b9b7c
JB		 218 status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
219 &data_ac, &meta_ac);
f56654c4
TM		 220 if (status) {
221 mlog_errno(status);
222 goto leave;
223 }
224
f99b9b7c
JB		 225 credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el,
226 clusters_to_add);
f56654c4
TM		 227 handle = ocfs2_start_trans(osb, credits);
228 if (IS_ERR(handle)) {
229 status = PTR_ERR(handle);
230 handle = NULL;
231 mlog_errno(status);
232 goto leave;
233 }
234
235restarted_transaction:
236 status = ocfs2_journal_access(handle, inode, xattr_bh,
237 OCFS2_JOURNAL_ACCESS_WRITE);
238 if (status < 0) {
239 mlog_errno(status);
240 goto leave;
241 }
242
243 prev_clusters = le32_to_cpu(xv->xr_clusters);
244 status = ocfs2_add_clusters_in_btree(osb,
245 inode,
246 &logical_start,
247 clusters_to_add,
248 0,
f99b9b7c 249 &et,
f56654c4
TM		 250 handle,
251 data_ac,
252 meta_ac,
f99b9b7c 253 &why);
f56654c4
TM		 254 if ((status < 0) && (status != -EAGAIN)) {
255 if (status != -ENOSPC)
256 mlog_errno(status);
257 goto leave;
258 }
259
260 status = ocfs2_journal_dirty(handle, xattr_bh);
261 if (status < 0) {
262 mlog_errno(status);
263 goto leave;
264 }
265
266 clusters_to_add -= le32_to_cpu(xv->xr_clusters) - prev_clusters;
267
268 if (why != RESTART_NONE && clusters_to_add) {
269 if (why == RESTART_META) {
270 mlog(0, "restarting function.\n");
271 restart_func = 1;
272 } else {
273 BUG_ON(why != RESTART_TRANS);
274
275 mlog(0, "restarting transaction.\n");
276 /* TODO: This can be more intelligent. */
277 credits = ocfs2_calc_extend_credits(osb->sb,
f99b9b7c 278 et.et_root_el,
f56654c4
TM		 279 clusters_to_add);
280 status = ocfs2_extend_trans(handle, credits);
281 if (status < 0) {
282 /* handle still has to be committed at
283 * this point. */
284 status = -ENOMEM;
285 mlog_errno(status);
286 goto leave;
287 }
288 goto restarted_transaction;
289 }
290 }
291
292leave:
293 if (handle) {
294 ocfs2_commit_trans(osb, handle);
295 handle = NULL;
296 }
297 if (data_ac) {
298 ocfs2_free_alloc_context(data_ac);
299 data_ac = NULL;
300 }
301 if (meta_ac) {
302 ocfs2_free_alloc_context(meta_ac);
303 meta_ac = NULL;
304 }
305 if ((!status) && restart_func) {
306 restart_func = 0;
307 goto restart_all;
308 }
309
310 return status;
311}
312
313static int __ocfs2_remove_xattr_range(struct inode *inode,
314 struct buffer_head *root_bh,
315 struct ocfs2_xattr_value_root *xv,
316 u32 cpos, u32 phys_cpos, u32 len,
317 struct ocfs2_cached_dealloc_ctxt *dealloc)
318{
319 int ret;
320 u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
321 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
322 struct inode *tl_inode = osb->osb_tl_inode;
323 handle_t *handle;
324 struct ocfs2_alloc_context *meta_ac = NULL;
f99b9b7c
JB		 325 struct ocfs2_extent_tree et;
326
8d6220d6 327 ocfs2_init_xattr_value_extent_tree(&et, inode, root_bh, xv);
f56654c4 328
f99b9b7c 329 ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
f56654c4
TM		 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
f99b9b7c
JB		 359 ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
360 dealloc);
f56654c4
TM		 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
8154da3d
TY		 567 if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
568 return -EOPNOTSUPP;
569
cf1d6c76
TY		 570 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
571 return ret;
572
573 ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0);
574 if (ret < 0) {
575 mlog_errno(ret);
576 return ret;
577 }
578
579 di = (struct ocfs2_dinode *)di_bh->b_data;
580
581 down_read(&oi->ip_xattr_sem);
582 i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size);
583 if (i_ret < 0)
584 b_ret = 0;
585 else {
586 if (buffer) {
587 buffer += i_ret;
588 size -= i_ret;
589 }
590 b_ret = ocfs2_xattr_block_list(dentry->d_inode, di,
591 buffer, size);
592 if (b_ret < 0)
593 i_ret = 0;
594 }
595 up_read(&oi->ip_xattr_sem);
596 ocfs2_inode_unlock(dentry->d_inode, 0);
597
598 brelse(di_bh);
599
600 return i_ret + b_ret;
601}
602
603static int ocfs2_xattr_find_entry(int name_index,
604 const char *name,
605 struct ocfs2_xattr_search *xs)
606{
607 struct ocfs2_xattr_entry *entry;
608 size_t name_len;
609 int i, cmp = 1;
610
611 if (name == NULL)
612 return -EINVAL;
613
614 name_len = strlen(name);
615 entry = xs->here;
616 for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
617 cmp = name_index - ocfs2_xattr_get_type(entry);
618 if (!cmp)
619 cmp = name_len - entry->xe_name_len;
620 if (!cmp)
621 cmp = memcmp(name, (xs->base +
622 le16_to_cpu(entry->xe_name_offset)),
623 name_len);
624 if (cmp == 0)
625 break;
626 entry += 1;
627 }
628 xs->here = entry;
629
630 return cmp ? -ENODATA : 0;
631}
632
633static int ocfs2_xattr_get_value_outside(struct inode *inode,
589dc260 634 struct ocfs2_xattr_value_root *xv,
cf1d6c76
TY		 635 void *buffer,
636 size_t len)
637{
638 u32 cpos, p_cluster, num_clusters, bpc, clusters;
639 u64 blkno;
640 int i, ret = 0;
641 size_t cplen, blocksize;
642 struct buffer_head *bh = NULL;
cf1d6c76
TY		 643 struct ocfs2_extent_list *el;
644
cf1d6c76
TY		 645 el = &xv->xr_list;
646 clusters = le32_to_cpu(xv->xr_clusters);
647 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
648 blocksize = inode->i_sb->s_blocksize;
649
650 cpos = 0;
651 while (cpos < clusters) {
652 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
653 &num_clusters, el);
654 if (ret) {
655 mlog_errno(ret);
656 goto out;
657 }
658
659 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
660 /* Copy ocfs2_xattr_value */
661 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
662 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno,
663 &bh, OCFS2_BH_CACHED, inode);
664 if (ret) {
665 mlog_errno(ret);
666 goto out;
667 }
668
669 cplen = len >= blocksize ? blocksize : len;
670 memcpy(buffer, bh->b_data, cplen);
671 len -= cplen;
672 buffer += cplen;
673
674 brelse(bh);
675 bh = NULL;
676 if (len == 0)
677 break;
678 }
679 cpos += num_clusters;
680 }
681out:
682 return ret;
683}
684
685static int ocfs2_xattr_ibody_get(struct inode *inode,
686 int name_index,
687 const char *name,
688 void *buffer,
689 size_t buffer_size,
690 struct ocfs2_xattr_search *xs)
691{
692 struct ocfs2_inode_info *oi = OCFS2_I(inode);
693 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
589dc260 694 struct ocfs2_xattr_value_root *xv;
cf1d6c76
TY		 695 size_t size;
696 int ret = 0;
697
698 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
699 return -ENODATA;
700
701 xs->end = (void *)di + inode->i_sb->s_blocksize;
702 xs->header = (struct ocfs2_xattr_header *)
703 (xs->end - le16_to_cpu(di->i_xattr_inline_size));
704 xs->base = (void *)xs->header;
705 xs->here = xs->header->xh_entries;
706
707 ret = ocfs2_xattr_find_entry(name_index, name, xs);
708 if (ret)
709 return ret;
710 size = le64_to_cpu(xs->here->xe_value_size);
711 if (buffer) {
712 if (size > buffer_size)
713 return -ERANGE;
714 if (ocfs2_xattr_is_local(xs->here)) {
715 memcpy(buffer, (void *)xs->base +
716 le16_to_cpu(xs->here->xe_name_offset) +
717 OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
718 } else {
589dc260
TM		 719 xv = (struct ocfs2_xattr_value_root *)
720 (xs->base + le16_to_cpu(
721 xs->here->xe_name_offset) +
722 OCFS2_XATTR_SIZE(xs->here->xe_name_len));
723 ret = ocfs2_xattr_get_value_outside(inode, xv,
cf1d6c76
TY		 724 buffer, size);
725 if (ret < 0) {
726 mlog_errno(ret);
727 return ret;
728 }
729 }
730 }
731
732 return size;
733}
734
735static int ocfs2_xattr_block_get(struct inode *inode,
736 int name_index,
737 const char *name,
738 void *buffer,
739 size_t buffer_size,
740 struct ocfs2_xattr_search *xs)
741{
742 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
743 struct buffer_head *blk_bh = NULL;
744 struct ocfs2_xattr_block *xb;
589dc260 745 struct ocfs2_xattr_value_root *xv;
cf1d6c76 746 size_t size;
589dc260 747 int ret = -ENODATA, name_offset, name_len, block_off, i;
cf1d6c76
TY		 748
749 if (!di->i_xattr_loc)
750 return ret;
751
589dc260
TM		 752 memset(&xs->bucket, 0, sizeof(xs->bucket));
753
cf1d6c76
TY		 754 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
755 le64_to_cpu(di->i_xattr_loc),
756 &blk_bh, OCFS2_BH_CACHED, inode);
757 if (ret < 0) {
758 mlog_errno(ret);
759 return ret;
760 }
761 /*Verify the signature of xattr block*/
762 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
763 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
764 ret = -EFAULT;
765 goto cleanup;
766 }
767
768 xs->xattr_bh = blk_bh;
769 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
cf1d6c76 770
589dc260
TM		 771 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
772 xs->header = &xb->xb_attrs.xb_header;
773 xs->base = (void *)xs->header;
774 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
775 xs->here = xs->header->xh_entries;
776
777 ret = ocfs2_xattr_find_entry(name_index, name, xs);
778 } else
779 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
780 name_index,
781 name, xs);
782
cf1d6c76
TY		 783 if (ret)
784 goto cleanup;
785 size = le64_to_cpu(xs->here->xe_value_size);
786 if (buffer) {
787 ret = -ERANGE;
788 if (size > buffer_size)
789 goto cleanup;
589dc260
TM		 790
791 name_offset = le16_to_cpu(xs->here->xe_name_offset);
792 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
793 i = xs->here - xs->header->xh_entries;
794
795 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
796 ret = ocfs2_xattr_bucket_get_name_value(inode,
797 xs->bucket.xh,
798 i,
799 &block_off,
800 &name_offset);
801 xs->base = xs->bucket.bhs[block_off]->b_data;
802 }
cf1d6c76
TY		 803 if (ocfs2_xattr_is_local(xs->here)) {
804 memcpy(buffer, (void *)xs->base +
589dc260 805 name_offset + name_len, size);
cf1d6c76 806 } else {
589dc260
TM		 807 xv = (struct ocfs2_xattr_value_root *)
808 (xs->base + name_offset + name_len);
809 ret = ocfs2_xattr_get_value_outside(inode, xv,
cf1d6c76
TY		 810 buffer, size);
811 if (ret < 0) {
812 mlog_errno(ret);
813 goto cleanup;
814 }
815 }
816 }
817 ret = size;
818cleanup:
589dc260
TM		 819 for (i = 0; i < OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET; i++)
820 brelse(xs->bucket.bhs[i]);
821 memset(&xs->bucket, 0, sizeof(xs->bucket));
cf1d6c76 822
589dc260 823 brelse(blk_bh);
cf1d6c76
TY		 824 return ret;
825}
826
827/* ocfs2_xattr_get()
828 *
829 * Copy an extended attribute into the buffer provided.
830 * Buffer is NULL to compute the size of buffer required.
831 */
832int ocfs2_xattr_get(struct inode *inode,
833 int name_index,
834 const char *name,
835 void *buffer,
836 size_t buffer_size)
837{
838 int ret;
839 struct ocfs2_dinode *di = NULL;
840 struct buffer_head *di_bh = NULL;
841 struct ocfs2_inode_info *oi = OCFS2_I(inode);
842 struct ocfs2_xattr_search xis = {
843 .not_found = -ENODATA,
844 };
845 struct ocfs2_xattr_search xbs = {
846 .not_found = -ENODATA,
847 };
848
8154da3d
TY		 849 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
850 return -EOPNOTSUPP;
851
cf1d6c76
TY		 852 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
853 ret = -ENODATA;
854
855 ret = ocfs2_inode_lock(inode, &di_bh, 0);
856 if (ret < 0) {
857 mlog_errno(ret);
858 return ret;
859 }
860 xis.inode_bh = xbs.inode_bh = di_bh;
861 di = (struct ocfs2_dinode *)di_bh->b_data;
862
863 down_read(&oi->ip_xattr_sem);
864 ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
865 buffer_size, &xis);
866 if (ret == -ENODATA)
867 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
868 buffer_size, &xbs);
869 up_read(&oi->ip_xattr_sem);
870 ocfs2_inode_unlock(inode, 0);
871
872 brelse(di_bh);
873
874 return ret;
875}
876
877static int __ocfs2_xattr_set_value_outside(struct inode *inode,
878 struct ocfs2_xattr_value_root *xv,
879 const void *value,
880 int value_len)
881{
882 int ret = 0, i, cp_len, credits;
883 u16 blocksize = inode->i_sb->s_blocksize;
884 u32 p_cluster, num_clusters;
885 u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
886 u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
887 u64 blkno;
888 struct buffer_head *bh = NULL;
889 handle_t *handle;
890
891 BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
892
893 credits = clusters * bpc;
894 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), credits);
895 if (IS_ERR(handle)) {
896 ret = PTR_ERR(handle);
897 mlog_errno(ret);
898 goto out;
899 }
900
901 while (cpos < clusters) {
902 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
903 &num_clusters, &xv->xr_list);
904 if (ret) {
905 mlog_errno(ret);
906 goto out_commit;
907 }
908
909 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
910
911 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
912 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno,
913 &bh, OCFS2_BH_CACHED, inode);
914 if (ret) {
915 mlog_errno(ret);
916 goto out_commit;
917 }
918
919 ret = ocfs2_journal_access(handle,
920 inode,
921 bh,
922 OCFS2_JOURNAL_ACCESS_WRITE);
923 if (ret < 0) {
924 mlog_errno(ret);
925 goto out_commit;
926 }
927
928 cp_len = value_len > blocksize ? blocksize : value_len;
929 memcpy(bh->b_data, value, cp_len);
930 value_len -= cp_len;
931 value += cp_len;
932 if (cp_len < blocksize)
933 memset(bh->b_data + cp_len, 0,
934 blocksize - cp_len);
935
936 ret = ocfs2_journal_dirty(handle, bh);
937 if (ret < 0) {
938 mlog_errno(ret);
939 goto out_commit;
940 }
941 brelse(bh);
942 bh = NULL;
943
944 /*
945 * XXX: do we need to empty all the following
946 * blocks in this cluster?
947 */
948 if (!value_len)
949 break;
950 }
951 cpos += num_clusters;
952 }
953out_commit:
954 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
955out:
956 brelse(bh);
957
958 return ret;
959}
960
961static int ocfs2_xattr_cleanup(struct inode *inode,
962 struct ocfs2_xattr_info *xi,
963 struct ocfs2_xattr_search *xs,
964 size_t offs)
965{
966 handle_t *handle = NULL;
967 int ret = 0;
968 size_t name_len = strlen(xi->name);
969 void *val = xs->base + offs;
970 size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
971
972 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
973 OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
974 if (IS_ERR(handle)) {
975 ret = PTR_ERR(handle);
976 mlog_errno(ret);
977 goto out;
978 }
979 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
980 OCFS2_JOURNAL_ACCESS_WRITE);
981 if (ret) {
982 mlog_errno(ret);
983 goto out_commit;
984 }
985 /* Decrease xattr count */
986 le16_add_cpu(&xs->header->xh_count, -1);
987 /* Remove the xattr entry and tree root which has already be set*/
988 memset((void *)xs->here, 0, sizeof(struct ocfs2_xattr_entry));
989 memset(val, 0, size);
990
991 ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
992 if (ret < 0)
993 mlog_errno(ret);
994out_commit:
995 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
996out:
997 return ret;
998}
999
1000static int ocfs2_xattr_update_entry(struct inode *inode,
1001 struct ocfs2_xattr_info *xi,
1002 struct ocfs2_xattr_search *xs,
1003 size_t offs)
1004{
1005 handle_t *handle = NULL;
1006 int ret = 0;
1007
1008 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1009 OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
1010 if (IS_ERR(handle)) {
1011 ret = PTR_ERR(handle);
1012 mlog_errno(ret);
1013 goto out;
1014 }
1015 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1016 OCFS2_JOURNAL_ACCESS_WRITE);
1017 if (ret) {
1018 mlog_errno(ret);
1019 goto out_commit;
1020 }
1021
1022 xs->here->xe_name_offset = cpu_to_le16(offs);
1023 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1024 if (xi->value_len <= OCFS2_XATTR_INLINE_SIZE)
1025 ocfs2_xattr_set_local(xs->here, 1);
1026 else
1027 ocfs2_xattr_set_local(xs->here, 0);
1028 ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1029
1030 ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
1031 if (ret < 0)
1032 mlog_errno(ret);
1033out_commit:
1034 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1035out:
1036 return ret;
1037}
1038
1039/*
1040 * ocfs2_xattr_set_value_outside()
1041 *
1042 * Set large size value in B tree.
1043 */
1044static int ocfs2_xattr_set_value_outside(struct inode *inode,
1045 struct ocfs2_xattr_info *xi,
1046 struct ocfs2_xattr_search *xs,
1047 size_t offs)
1048{
1049 size_t name_len = strlen(xi->name);
1050 void *val = xs->base + offs;
1051 struct ocfs2_xattr_value_root *xv = NULL;
1052 size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1053 int ret = 0;
1054
1055 memset(val, 0, size);
1056 memcpy(val, xi->name, name_len);
1057 xv = (struct ocfs2_xattr_value_root *)
1058 (val + OCFS2_XATTR_SIZE(name_len));
1059 xv->xr_clusters = 0;
1060 xv->xr_last_eb_blk = 0;
1061 xv->xr_list.l_tree_depth = 0;
1062 xv->xr_list.l_count = cpu_to_le16(1);
1063 xv->xr_list.l_next_free_rec = 0;
1064
1065 ret = ocfs2_xattr_value_truncate(inode, xs->xattr_bh, xv,
1066 xi->value_len);
1067 if (ret < 0) {
1068 mlog_errno(ret);
1069 return ret;
1070 }
1071 ret = __ocfs2_xattr_set_value_outside(inode, xv, xi->value,
1072 xi->value_len);
1073 if (ret < 0) {
1074 mlog_errno(ret);
1075 return ret;
1076 }
1077 ret = ocfs2_xattr_update_entry(inode, xi, xs, offs);
1078 if (ret < 0)
1079 mlog_errno(ret);
1080
1081 return ret;
1082}
1083
1084/*
1085 * ocfs2_xattr_set_entry_local()
1086 *
1087 * Set, replace or remove extended attribute in local.
1088 */
1089static void ocfs2_xattr_set_entry_local(struct inode *inode,
1090 struct ocfs2_xattr_info *xi,
1091 struct ocfs2_xattr_search *xs,
1092 struct ocfs2_xattr_entry *last,
1093 size_t min_offs)
1094{
1095 size_t name_len = strlen(xi->name);
1096 int i;
1097
1098 if (xi->value && xs->not_found) {
1099 /* Insert the new xattr entry. */
1100 le16_add_cpu(&xs->header->xh_count, 1);
1101 ocfs2_xattr_set_type(last, xi->name_index);
1102 ocfs2_xattr_set_local(last, 1);
1103 last->xe_name_len = name_len;
1104 } else {
1105 void *first_val;
1106 void *val;
1107 size_t offs, size;
1108
1109 first_val = xs->base + min_offs;
1110 offs = le16_to_cpu(xs->here->xe_name_offset);
1111 val = xs->base + offs;
1112
1113 if (le64_to_cpu(xs->here->xe_value_size) >
1114 OCFS2_XATTR_INLINE_SIZE)
1115 size = OCFS2_XATTR_SIZE(name_len) +
1116 OCFS2_XATTR_ROOT_SIZE;
1117 else
1118 size = OCFS2_XATTR_SIZE(name_len) +
1119 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1120
1121 if (xi->value && size == OCFS2_XATTR_SIZE(name_len) +
1122 OCFS2_XATTR_SIZE(xi->value_len)) {
1123 /* The old and the new value have the
1124 same size. Just replace the value. */
1125 ocfs2_xattr_set_local(xs->here, 1);
1126 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1127 /* Clear value bytes. */
1128 memset(val + OCFS2_XATTR_SIZE(name_len),
1129 0,
1130 OCFS2_XATTR_SIZE(xi->value_len));
1131 memcpy(val + OCFS2_XATTR_SIZE(name_len),
1132 xi->value,
1133 xi->value_len);
1134 return;
1135 }
1136 /* Remove the old name+value. */
1137 memmove(first_val + size, first_val, val - first_val);
1138 memset(first_val, 0, size);
1139 xs->here->xe_name_hash = 0;
1140 xs->here->xe_name_offset = 0;
1141 ocfs2_xattr_set_local(xs->here, 1);
1142 xs->here->xe_value_size = 0;
1143
1144 min_offs += size;
1145
1146 /* Adjust all value offsets. */
1147 last = xs->header->xh_entries;
1148 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1149 size_t o = le16_to_cpu(last->xe_name_offset);
1150
1151 if (o < offs)
1152 last->xe_name_offset = cpu_to_le16(o + size);
1153 last += 1;
1154 }
1155
1156 if (!xi->value) {
1157 /* Remove the old entry. */
1158 last -= 1;
1159 memmove(xs->here, xs->here + 1,
1160 (void *)last - (void *)xs->here);
1161 memset(last, 0, sizeof(struct ocfs2_xattr_entry));
1162 le16_add_cpu(&xs->header->xh_count, -1);
1163 }
1164 }
1165 if (xi->value) {
1166 /* Insert the new name+value. */
1167 size_t size = OCFS2_XATTR_SIZE(name_len) +
1168 OCFS2_XATTR_SIZE(xi->value_len);
1169 void *val = xs->base + min_offs - size;
1170
1171 xs->here->xe_name_offset = cpu_to_le16(min_offs - size);
1172 memset(val, 0, size);
1173 memcpy(val, xi->name, name_len);
1174 memcpy(val + OCFS2_XATTR_SIZE(name_len),
1175 xi->value,
1176 xi->value_len);
1177 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1178 ocfs2_xattr_set_local(xs->here, 1);
1179 ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1180 }
1181
1182 return;
1183}
1184
1185/*
1186 * ocfs2_xattr_set_entry()
1187 *
1188 * Set extended attribute entry into inode or block.
1189 *
1190 * If extended attribute value size > OCFS2_XATTR_INLINE_SIZE,
1191 * We first insert tree root(ocfs2_xattr_value_root) with set_entry_local(),
1192 * then set value in B tree with set_value_outside().
1193 */
1194static int ocfs2_xattr_set_entry(struct inode *inode,
1195 struct ocfs2_xattr_info *xi,
1196 struct ocfs2_xattr_search *xs,
1197 int flag)
1198{
1199 struct ocfs2_xattr_entry *last;
1200 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1201 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1202 size_t min_offs = xs->end - xs->base, name_len = strlen(xi->name);
1203 size_t size_l = 0;
1204 handle_t *handle = NULL;
1205 int free, i, ret;
1206 struct ocfs2_xattr_info xi_l = {
1207 .name_index = xi->name_index,
1208 .name = xi->name,
1209 .value = xi->value,
1210 .value_len = xi->value_len,
1211 };
1212
1213 /* Compute min_offs, last and free space. */
1214 last = xs->header->xh_entries;
1215
1216 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1217 size_t offs = le16_to_cpu(last->xe_name_offset);
1218 if (offs < min_offs)
1219 min_offs = offs;
1220 last += 1;
1221 }
1222
1223 free = min_offs - ((void *)last - xs->base) - sizeof(__u32);
1224 if (free < 0)
1225 return -EFAULT;
1226
1227 if (!xs->not_found) {
1228 size_t size = 0;
1229 if (ocfs2_xattr_is_local(xs->here))
1230 size = OCFS2_XATTR_SIZE(name_len) +
1231 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1232 else
1233 size = OCFS2_XATTR_SIZE(name_len) +
1234 OCFS2_XATTR_ROOT_SIZE;
1235 free += (size + sizeof(struct ocfs2_xattr_entry));
1236 }
1237 /* Check free space in inode or block */
1238 if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1239 if (free < sizeof(struct ocfs2_xattr_entry) +
1240 OCFS2_XATTR_SIZE(name_len) +
1241 OCFS2_XATTR_ROOT_SIZE) {
1242 ret = -ENOSPC;
1243 goto out;
1244 }
1245 size_l = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1246 xi_l.value = (void *)&def_xv;
1247 xi_l.value_len = OCFS2_XATTR_ROOT_SIZE;
1248 } else if (xi->value) {
1249 if (free < sizeof(struct ocfs2_xattr_entry) +
1250 OCFS2_XATTR_SIZE(name_len) +
1251 OCFS2_XATTR_SIZE(xi->value_len)) {
1252 ret = -ENOSPC;
1253 goto out;
1254 }
1255 }
1256
1257 if (!xs->not_found) {
1258 /* For existing extended attribute */
1259 size_t size = OCFS2_XATTR_SIZE(name_len) +
1260 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1261 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1262 void *val = xs->base + offs;
1263
1264 if (ocfs2_xattr_is_local(xs->here) && size == size_l) {
1265 /* Replace existing local xattr with tree root */
1266 ret = ocfs2_xattr_set_value_outside(inode, xi, xs,
1267 offs);
1268 if (ret < 0)
1269 mlog_errno(ret);
1270 goto out;
1271 } else if (!ocfs2_xattr_is_local(xs->here)) {
1272 /* For existing xattr which has value outside */
1273 struct ocfs2_xattr_value_root *xv = NULL;
1274 xv = (struct ocfs2_xattr_value_root *)(val +
1275 OCFS2_XATTR_SIZE(name_len));
1276
1277 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1278 /*
1279 * If new value need set outside also,
1280 * first truncate old value to new value,
1281 * then set new value with set_value_outside().
1282 */
1283 ret = ocfs2_xattr_value_truncate(inode,
1284 xs->xattr_bh,
1285 xv,
1286 xi->value_len);
1287 if (ret < 0) {
1288 mlog_errno(ret);
1289 goto out;
1290 }
1291
1292 ret = __ocfs2_xattr_set_value_outside(inode,
1293 xv,
1294 xi->value,
1295 xi->value_len);
1296 if (ret < 0) {
1297 mlog_errno(ret);
1298 goto out;
1299 }
1300
1301 ret = ocfs2_xattr_update_entry(inode,
1302 xi,
1303 xs,
1304 offs);
1305 if (ret < 0)
1306 mlog_errno(ret);
1307 goto out;
1308 } else {
1309 /*
1310 * If new value need set in local,
1311 * just trucate old value to zero.
1312 */
1313 ret = ocfs2_xattr_value_truncate(inode,
1314 xs->xattr_bh,
1315 xv,
1316 0);
1317 if (ret < 0)
1318 mlog_errno(ret);
1319 }
1320 }
1321 }
1322
1323 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1324 OCFS2_INODE_UPDATE_CREDITS);
1325 if (IS_ERR(handle)) {
1326 ret = PTR_ERR(handle);
1327 mlog_errno(ret);
1328 goto out;
1329 }
1330
1331 ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
1332 OCFS2_JOURNAL_ACCESS_WRITE);
1333 if (ret) {
1334 mlog_errno(ret);
1335 goto out_commit;
1336 }
1337
1338 if (!(flag & OCFS2_INLINE_XATTR_FL)) {
28b8ca0b 1339 /* set extended attribute in external block. */
cf1d6c76 1340 ret = ocfs2_extend_trans(handle,
28b8ca0b 1341 OCFS2_INODE_UPDATE_CREDITS +
cf1d6c76
TY		 1342 OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
1343 if (ret) {
1344 mlog_errno(ret);
1345 goto out_commit;
1346 }
1347 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1348 OCFS2_JOURNAL_ACCESS_WRITE);
1349 if (ret) {
1350 mlog_errno(ret);
1351 goto out_commit;
1352 }
1353 }
1354
1355 /*
1356 * Set value in local, include set tree root in local.
1357 * This is the first step for value size >INLINE_SIZE.
1358 */
1359 ocfs2_xattr_set_entry_local(inode, &xi_l, xs, last, min_offs);
1360
1361 if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1362 ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
1363 if (ret < 0) {
1364 mlog_errno(ret);
1365 goto out_commit;
1366 }
1367 }
1368
1369 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) &&
1370 (flag & OCFS2_INLINE_XATTR_FL)) {
1371 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1372 unsigned int xattrsize = osb->s_xattr_inline_size;
1373
1374 /*
1375 * Adjust extent record count or inline data size
1376 * to reserve space for extended attribute.
1377 */
1378 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1379 struct ocfs2_inline_data *idata = &di->id2.i_data;
1380 le16_add_cpu(&idata->id_count, -xattrsize);
1381 } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
1382 struct ocfs2_extent_list *el = &di->id2.i_list;
1383 le16_add_cpu(&el->l_count, -(xattrsize /
1384 sizeof(struct ocfs2_extent_rec)));
1385 }
1386 di->i_xattr_inline_size = cpu_to_le16(xattrsize);
1387 }
1388 /* Update xattr flag */
1389 spin_lock(&oi->ip_lock);
1390 oi->ip_dyn_features |= flag;
1391 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1392 spin_unlock(&oi->ip_lock);
1393 /* Update inode ctime */
1394 inode->i_ctime = CURRENT_TIME;
1395 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
1396 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
1397
1398 ret = ocfs2_journal_dirty(handle, xs->inode_bh);
1399 if (ret < 0)
1400 mlog_errno(ret);
1401
1402out_commit:
1403 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1404
1405 if (!ret && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1406 /*
1407 * Set value outside in B tree.
1408 * This is the second step for value size > INLINE_SIZE.
1409 */
1410 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1411 ret = ocfs2_xattr_set_value_outside(inode, xi, xs, offs);
1412 if (ret < 0) {
1413 int ret2;
1414
1415 mlog_errno(ret);
1416 /*
1417 * If set value outside failed, we have to clean
1418 * the junk tree root we have already set in local.
1419 */
1420 ret2 = ocfs2_xattr_cleanup(inode, xi, xs, offs);
1421 if (ret2 < 0)
1422 mlog_errno(ret2);
1423 }
1424 }
1425out:
1426 return ret;
1427
1428}
1429
cf1d6c76
TY		 1430static int ocfs2_remove_value_outside(struct inode*inode,
1431 struct buffer_head *bh,
1432 struct ocfs2_xattr_header *header)
1433{
1434 int ret = 0, i;
1435
1436 for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
1437 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
1438
1439 if (!ocfs2_xattr_is_local(entry)) {
1440 struct ocfs2_xattr_value_root *xv;
1441 void *val;
1442
1443 val = (void *)header +
1444 le16_to_cpu(entry->xe_name_offset);
1445 xv = (struct ocfs2_xattr_value_root *)
1446 (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
1447 ret = ocfs2_xattr_value_truncate(inode, bh, xv, 0);
1448 if (ret < 0) {
1449 mlog_errno(ret);
1450 return ret;
1451 }
1452 }
1453 }
1454
1455 return ret;
1456}
1457
1458static int ocfs2_xattr_ibody_remove(struct inode *inode,
1459 struct buffer_head *di_bh)
1460{
1461
1462 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1463 struct ocfs2_xattr_header *header;
1464 int ret;
1465
1466 header = (struct ocfs2_xattr_header *)
1467 ((void *)di + inode->i_sb->s_blocksize -
1468 le16_to_cpu(di->i_xattr_inline_size));
1469
1470 ret = ocfs2_remove_value_outside(inode, di_bh, header);
1471
1472 return ret;
1473}
1474
1475static int ocfs2_xattr_block_remove(struct inode *inode,
1476 struct buffer_head *blk_bh)
1477{
1478 struct ocfs2_xattr_block *xb;
cf1d6c76
TY		 1479 int ret = 0;
1480
1481 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
a3944256
TM		 1482 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
1483 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
1484 ret = ocfs2_remove_value_outside(inode, blk_bh, header);
1485 } else
1486 ret = ocfs2_delete_xattr_index_block(inode, blk_bh);
cf1d6c76
TY		 1487
1488 return ret;
1489}
1490
08413899
TM		 1491static int ocfs2_xattr_free_block(struct inode *inode,
1492 u64 block)
1493{
1494 struct inode *xb_alloc_inode;
1495 struct buffer_head *xb_alloc_bh = NULL;
1496 struct buffer_head *blk_bh = NULL;
1497 struct ocfs2_xattr_block *xb;
1498 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1499 handle_t *handle;
1500 int ret = 0;
1501 u64 blk, bg_blkno;
1502 u16 bit;
1503
1504 ret = ocfs2_read_block(osb, block, &blk_bh,
1505 OCFS2_BH_CACHED, inode);
1506 if (ret < 0) {
1507 mlog_errno(ret);
1508 goto out;
1509 }
1510
1511 /*Verify the signature of xattr block*/
1512 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
1513 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
1514 ret = -EFAULT;
1515 goto out;
1516 }
1517
1518 ret = ocfs2_xattr_block_remove(inode, blk_bh);
1519 if (ret < 0) {
1520 mlog_errno(ret);
1521 goto out;
1522 }
1523
1524 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1525 blk = le64_to_cpu(xb->xb_blkno);
1526 bit = le16_to_cpu(xb->xb_suballoc_bit);
1527 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
1528
1529 xb_alloc_inode = ocfs2_get_system_file_inode(osb,
1530 EXTENT_ALLOC_SYSTEM_INODE,
1531 le16_to_cpu(xb->xb_suballoc_slot));
1532 if (!xb_alloc_inode) {
1533 ret = -ENOMEM;
1534 mlog_errno(ret);
1535 goto out;
1536 }
1537 mutex_lock(&xb_alloc_inode->i_mutex);
1538
1539 ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
1540 if (ret < 0) {
1541 mlog_errno(ret);
1542 goto out_mutex;
1543 }
1544
1545 handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
1546 if (IS_ERR(handle)) {
1547 ret = PTR_ERR(handle);
1548 mlog_errno(ret);
1549 goto out_unlock;
1550 }
1551
1552 ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
1553 bit, bg_blkno, 1);
1554 if (ret < 0)
1555 mlog_errno(ret);
1556
1557 ocfs2_commit_trans(osb, handle);
1558out_unlock:
1559 ocfs2_inode_unlock(xb_alloc_inode, 1);
1560 brelse(xb_alloc_bh);
1561out_mutex:
1562 mutex_unlock(&xb_alloc_inode->i_mutex);
1563 iput(xb_alloc_inode);
1564out:
1565 brelse(blk_bh);
1566 return ret;
1567}
1568
cf1d6c76
TY		 1569/*
1570 * ocfs2_xattr_remove()
1571 *
1572 * Free extended attribute resources associated with this inode.
1573 */
1574int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
1575{
cf1d6c76
TY		 1576 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1577 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1578 handle_t *handle;
1579 int ret;
1580
8154da3d
TY		 1581 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1582 return 0;
1583
cf1d6c76
TY		 1584 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1585 return 0;
1586
1587 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
1588 ret = ocfs2_xattr_ibody_remove(inode, di_bh);
1589 if (ret < 0) {
1590 mlog_errno(ret);
1591 goto out;
1592 }
1593 }
cf1d6c76 1594
08413899
TM		 1595 if (di->i_xattr_loc) {
1596 ret = ocfs2_xattr_free_block(inode,
1597 le64_to_cpu(di->i_xattr_loc));
cf1d6c76
TY		 1598 if (ret < 0) {
1599 mlog_errno(ret);
1600 goto out;
1601 }
1602 }
1603
1604 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1605 OCFS2_INODE_UPDATE_CREDITS);
1606 if (IS_ERR(handle)) {
1607 ret = PTR_ERR(handle);
1608 mlog_errno(ret);
1609 goto out;
1610 }
1611 ret = ocfs2_journal_access(handle, inode, di_bh,
1612 OCFS2_JOURNAL_ACCESS_WRITE);
1613 if (ret) {
1614 mlog_errno(ret);
1615 goto out_commit;
1616 }
1617
08413899 1618 di->i_xattr_loc = 0;
cf1d6c76
TY		 1619
1620 spin_lock(&oi->ip_lock);
1621 oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
1622 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1623 spin_unlock(&oi->ip_lock);
1624
1625 ret = ocfs2_journal_dirty(handle, di_bh);
1626 if (ret < 0)
1627 mlog_errno(ret);
1628out_commit:
1629 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1630out:
cf1d6c76
TY		 1631 return ret;
1632}
1633
1634static int ocfs2_xattr_has_space_inline(struct inode *inode,
1635 struct ocfs2_dinode *di)
1636{
1637 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1638 unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
1639 int free;
1640
1641 if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
1642 return 0;
1643
1644 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1645 struct ocfs2_inline_data *idata = &di->id2.i_data;
1646 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
1647 } else if (ocfs2_inode_is_fast_symlink(inode)) {
1648 free = ocfs2_fast_symlink_chars(inode->i_sb) -
1649 le64_to_cpu(di->i_size);
1650 } else {
1651 struct ocfs2_extent_list *el = &di->id2.i_list;
1652 free = (le16_to_cpu(el->l_count) -
1653 le16_to_cpu(el->l_next_free_rec)) *
1654 sizeof(struct ocfs2_extent_rec);
1655 }
1656 if (free >= xattrsize)
1657 return 1;
1658
1659 return 0;
1660}
1661
1662/*
1663 * ocfs2_xattr_ibody_find()
1664 *
1665 * Find extended attribute in inode block and
1666 * fill search info into struct ocfs2_xattr_search.
1667 */
1668static int ocfs2_xattr_ibody_find(struct inode *inode,
1669 int name_index,
1670 const char *name,
1671 struct ocfs2_xattr_search *xs)
1672{
1673 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1674 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1675 int ret;
1676 int has_space = 0;
1677
1678 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
1679 return 0;
1680
1681 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
1682 down_read(&oi->ip_alloc_sem);
1683 has_space = ocfs2_xattr_has_space_inline(inode, di);
1684 up_read(&oi->ip_alloc_sem);
1685 if (!has_space)
1686 return 0;
1687 }
1688
1689 xs->xattr_bh = xs->inode_bh;
1690 xs->end = (void *)di + inode->i_sb->s_blocksize;
1691 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
1692 xs->header = (struct ocfs2_xattr_header *)
1693 (xs->end - le16_to_cpu(di->i_xattr_inline_size));
1694 else
1695 xs->header = (struct ocfs2_xattr_header *)
1696 (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
1697 xs->base = (void *)xs->header;
1698 xs->here = xs->header->xh_entries;
1699
1700 /* Find the named attribute. */
1701 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
1702 ret = ocfs2_xattr_find_entry(name_index, name, xs);
1703 if (ret && ret != -ENODATA)
1704 return ret;
1705 xs->not_found = ret;
1706 }
1707
1708 return 0;
1709}
1710
1711/*
1712 * ocfs2_xattr_ibody_set()
1713 *
1714 * Set, replace or remove an extended attribute into inode block.
1715 *
1716 */
1717static int ocfs2_xattr_ibody_set(struct inode *inode,
1718 struct ocfs2_xattr_info *xi,
1719 struct ocfs2_xattr_search *xs)
1720{
1721 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1722 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1723 int ret;
1724
1725 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
1726 return -ENOSPC;
1727
1728 down_write(&oi->ip_alloc_sem);
1729 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
1730 if (!ocfs2_xattr_has_space_inline(inode, di)) {
1731 ret = -ENOSPC;
1732 goto out;
1733 }
1734 }
1735
1736 ret = ocfs2_xattr_set_entry(inode, xi, xs,
1737 (OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL));
1738out:
1739 up_write(&oi->ip_alloc_sem);
1740
1741 return ret;
1742}
1743
1744/*
1745 * ocfs2_xattr_block_find()
1746 *
1747 * Find extended attribute in external block and
1748 * fill search info into struct ocfs2_xattr_search.
1749 */
1750static int ocfs2_xattr_block_find(struct inode *inode,
1751 int name_index,
1752 const char *name,
1753 struct ocfs2_xattr_search *xs)
1754{
1755 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1756 struct buffer_head *blk_bh = NULL;
589dc260 1757 struct ocfs2_xattr_block *xb;
cf1d6c76
TY		 1758 int ret = 0;
1759
1760 if (!di->i_xattr_loc)
1761 return ret;
1762
1763 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
1764 le64_to_cpu(di->i_xattr_loc),
1765 &blk_bh, OCFS2_BH_CACHED, inode);
1766 if (ret < 0) {
1767 mlog_errno(ret);
1768 return ret;
1769 }
1770 /*Verify the signature of xattr block*/
1771 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
1772 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
1773 ret = -EFAULT;
1774 goto cleanup;
1775 }
1776
1777 xs->xattr_bh = blk_bh;
589dc260
TM		 1778 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1779
1780 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
1781 xs->header = &xb->xb_attrs.xb_header;
1782 xs->base = (void *)xs->header;
1783 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
1784 xs->here = xs->header->xh_entries;
1785
1786 ret = ocfs2_xattr_find_entry(name_index, name, xs);
1787 } else
1788 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
1789 name_index,
1790 name, xs);
cf1d6c76 1791
cf1d6c76
TY		 1792 if (ret && ret != -ENODATA) {
1793 xs->xattr_bh = NULL;
1794 goto cleanup;
1795 }
1796 xs->not_found = ret;
1797 return 0;
cf1d6c76
TY		 1798cleanup:
1799 brelse(blk_bh);
1800
1801 return ret;
1802}
1803
01225596
TM		 1804/*
1805 * When all the xattrs are deleted from index btree, the ocfs2_xattr_tree
1806 * will be erased and ocfs2_xattr_block will have its ocfs2_xattr_header
1807 * re-initialized.
1808 */
1809static int ocfs2_restore_xattr_block(struct inode *inode,
1810 struct ocfs2_xattr_search *xs)
1811{
1812 int ret;
1813 handle_t *handle;
1814 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1815 struct ocfs2_xattr_block *xb =
1816 (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1817 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
1818 u16 xb_flags = le16_to_cpu(xb->xb_flags);
1819
1820 BUG_ON(!(xb_flags & OCFS2_XATTR_INDEXED) ||
1821 le16_to_cpu(el->l_next_free_rec) != 0);
1822
1823 handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
1824 if (IS_ERR(handle)) {
1825 ret = PTR_ERR(handle);
1826 handle = NULL;
1827 goto out;
1828 }
1829
1830 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1831 OCFS2_JOURNAL_ACCESS_WRITE);
1832 if (ret < 0) {
1833 mlog_errno(ret);
1834 goto out_commit;
1835 }
1836
1837 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
1838 offsetof(struct ocfs2_xattr_block, xb_attrs));
1839
1840 xb->xb_flags = cpu_to_le16(xb_flags & ~OCFS2_XATTR_INDEXED);
1841
1842 ocfs2_journal_dirty(handle, xs->xattr_bh);
1843
1844out_commit:
1845 ocfs2_commit_trans(osb, handle);
1846out:
1847 return ret;
1848}
1849
cf1d6c76
TY		 1850/*
1851 * ocfs2_xattr_block_set()
1852 *
1853 * Set, replace or remove an extended attribute into external block.
1854 *
1855 */
1856static int ocfs2_xattr_block_set(struct inode *inode,
1857 struct ocfs2_xattr_info *xi,
1858 struct ocfs2_xattr_search *xs)
1859{
1860 struct buffer_head *new_bh = NULL;
1861 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1862 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1863 struct ocfs2_alloc_context *meta_ac = NULL;
1864 handle_t *handle = NULL;
1865 struct ocfs2_xattr_block *xblk = NULL;
1866 u16 suballoc_bit_start;
1867 u32 num_got;
1868 u64 first_blkno;
1869 int ret;
1870
1871 if (!xs->xattr_bh) {
1872 /*
1873 * Alloc one external block for extended attribute
1874 * outside of inode.
1875 */
1876 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
1877 if (ret < 0) {
1878 mlog_errno(ret);
1879 goto out;
1880 }
1881 handle = ocfs2_start_trans(osb,
1882 OCFS2_XATTR_BLOCK_CREATE_CREDITS);
1883 if (IS_ERR(handle)) {
1884 ret = PTR_ERR(handle);
1885 mlog_errno(ret);
1886 goto out;
1887 }
1888 ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
1889 OCFS2_JOURNAL_ACCESS_CREATE);
1890 if (ret < 0) {
1891 mlog_errno(ret);
1892 goto out_commit;
1893 }
1894
1895 ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1,
1896 &suballoc_bit_start, &num_got,
1897 &first_blkno);
1898 if (ret < 0) {
1899 mlog_errno(ret);
1900 goto out_commit;
1901 }
1902
1903 new_bh = sb_getblk(inode->i_sb, first_blkno);
1904 ocfs2_set_new_buffer_uptodate(inode, new_bh);
1905
1906 ret = ocfs2_journal_access(handle, inode, new_bh,
1907 OCFS2_JOURNAL_ACCESS_CREATE);
1908 if (ret < 0) {
1909 mlog_errno(ret);
1910 goto out_commit;
1911 }
1912
1913 /* Initialize ocfs2_xattr_block */
1914 xs->xattr_bh = new_bh;
1915 xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
1916 memset(xblk, 0, inode->i_sb->s_blocksize);
1917 strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
1918 xblk->xb_suballoc_slot = cpu_to_le16(osb->slot_num);
1919 xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
1920 xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation);
1921 xblk->xb_blkno = cpu_to_le64(first_blkno);
1922
1923 xs->header = &xblk->xb_attrs.xb_header;
1924 xs->base = (void *)xs->header;
1925 xs->end = (void *)xblk + inode->i_sb->s_blocksize;
1926 xs->here = xs->header->xh_entries;
1927
1928
1929 ret = ocfs2_journal_dirty(handle, new_bh);
1930 if (ret < 0) {
1931 mlog_errno(ret);
1932 goto out_commit;
1933 }
1934 di->i_xattr_loc = cpu_to_le64(first_blkno);
1935 ret = ocfs2_journal_dirty(handle, xs->inode_bh);
1936 if (ret < 0)
1937 mlog_errno(ret);
1938out_commit:
1939 ocfs2_commit_trans(osb, handle);
1940out:
1941 if (meta_ac)
1942 ocfs2_free_alloc_context(meta_ac);
1943 if (ret < 0)
1944 return ret;
01225596
TM		 1945 } else
1946 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1947
1948 if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
1949 /* Set extended attribute into external block */
1950 ret = ocfs2_xattr_set_entry(inode, xi, xs, OCFS2_HAS_XATTR_FL);
1951 if (!ret || ret != -ENOSPC)
1952 goto end;
1953
1954 ret = ocfs2_xattr_create_index_block(inode, xs);
1955 if (ret)
1956 goto end;
cf1d6c76
TY		 1957 }
1958
01225596
TM		 1959 ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs);
1960 if (!ret && xblk->xb_attrs.xb_root.xt_list.l_next_free_rec == 0)
1961 ret = ocfs2_restore_xattr_block(inode, xs);
1962
1963end:
cf1d6c76
TY		 1964
1965 return ret;
1966}
1967
1968/*
1969 * ocfs2_xattr_set()
1970 *
1971 * Set, replace or remove an extended attribute for this inode.
1972 * value is NULL to remove an existing extended attribute, else either
1973 * create or replace an extended attribute.
1974 */
1975int ocfs2_xattr_set(struct inode *inode,
1976 int name_index,
1977 const char *name,
1978 const void *value,
1979 size_t value_len,
1980 int flags)
1981{
1982 struct buffer_head *di_bh = NULL;
1983 struct ocfs2_dinode *di;
1984 int ret;
01225596 1985 u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
cf1d6c76
TY		 1986
1987 struct ocfs2_xattr_info xi = {
1988 .name_index = name_index,
1989 .name = name,
1990 .value = value,
1991 .value_len = value_len,
1992 };
1993
1994 struct ocfs2_xattr_search xis = {
1995 .not_found = -ENODATA,
1996 };
1997
1998 struct ocfs2_xattr_search xbs = {
1999 .not_found = -ENODATA,
2000 };
2001
8154da3d
TY		 2002 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2003 return -EOPNOTSUPP;
2004
cf1d6c76
TY		 2005 ret = ocfs2_inode_lock(inode, &di_bh, 1);
2006 if (ret < 0) {
2007 mlog_errno(ret);
2008 return ret;
2009 }
2010 xis.inode_bh = xbs.inode_bh = di_bh;
2011 di = (struct ocfs2_dinode *)di_bh->b_data;
2012
2013 down_write(&OCFS2_I(inode)->ip_xattr_sem);
2014 /*
2015 * Scan inode and external block to find the same name
2016 * extended attribute and collect search infomation.
2017 */
2018 ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
2019 if (ret)
2020 goto cleanup;
2021 if (xis.not_found) {
2022 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
2023 if (ret)
2024 goto cleanup;
2025 }
2026
2027 if (xis.not_found && xbs.not_found) {
2028 ret = -ENODATA;
2029 if (flags & XATTR_REPLACE)
2030 goto cleanup;
2031 ret = 0;
2032 if (!value)
2033 goto cleanup;
2034 } else {
2035 ret = -EEXIST;
2036 if (flags & XATTR_CREATE)
2037 goto cleanup;
2038 }
2039
2040 if (!value) {
2041 /* Remove existing extended attribute */
2042 if (!xis.not_found)
2043 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
2044 else if (!xbs.not_found)
2045 ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
2046 } else {
2047 /* We always try to set extended attribute into inode first*/
2048 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
2049 if (!ret && !xbs.not_found) {
2050 /*
2051 * If succeed and that extended attribute existing in
2052 * external block, then we will remove it.
2053 */
2054 xi.value = NULL;
2055 xi.value_len = 0;
2056 ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
2057 } else if (ret == -ENOSPC) {
2058 if (di->i_xattr_loc && !xbs.xattr_bh) {
2059 ret = ocfs2_xattr_block_find(inode, name_index,
2060 name, &xbs);
2061 if (ret)
2062 goto cleanup;
2063 }
2064 /*
2065 * If no space in inode, we will set extended attribute
2066 * into external block.
2067 */
2068 ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
2069 if (ret)
2070 goto cleanup;
2071 if (!xis.not_found) {
2072 /*
2073 * If succeed and that extended attribute
2074 * existing in inode, we will remove it.
2075 */
2076 xi.value = NULL;
2077 xi.value_len = 0;
2078 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
2079 }
2080 }
2081 }
2082cleanup:
2083 up_write(&OCFS2_I(inode)->ip_xattr_sem);
2084 ocfs2_inode_unlock(inode, 1);
2085 brelse(di_bh);
2086 brelse(xbs.xattr_bh);
01225596
TM		 2087 for (i = 0; i < blk_per_bucket; i++)
2088 brelse(xbs.bucket.bhs[i]);
cf1d6c76
TY		 2089
2090 return ret;
2091}
2092
589dc260
TM		 2093static inline u32 ocfs2_xattr_hash_by_name(struct inode *inode,
2094 int name_index,
2095 const char *suffix_name)
2096{
2097 struct xattr_handler *handler = ocfs2_xattr_handler(name_index);
2098 char *prefix = handler->prefix;
2099 int prefix_len = strlen(handler->prefix);
2100
2101 return ocfs2_xattr_name_hash(inode, prefix, prefix_len,
2102 (char *)suffix_name, strlen(suffix_name));
2103}
2104
0c044f0b
TM		 2105/*
2106 * Find the xattr extent rec which may contains name_hash.
2107 * e_cpos will be the first name hash of the xattr rec.
2108 * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
2109 */
2110static int ocfs2_xattr_get_rec(struct inode *inode,
2111 u32 name_hash,
2112 u64 *p_blkno,
2113 u32 *e_cpos,
2114 u32 *num_clusters,
2115 struct ocfs2_extent_list *el)
2116{
2117 int ret = 0, i;
2118 struct buffer_head *eb_bh = NULL;
2119 struct ocfs2_extent_block *eb;
2120 struct ocfs2_extent_rec *rec = NULL;
2121 u64 e_blkno = 0;
2122
2123 if (el->l_tree_depth) {
2124 ret = ocfs2_find_leaf(inode, el, name_hash, &eb_bh);
2125 if (ret) {
2126 mlog_errno(ret);
2127 goto out;
2128 }
2129
2130 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2131 el = &eb->h_list;
2132
2133 if (el->l_tree_depth) {
2134 ocfs2_error(inode->i_sb,
2135 "Inode %lu has non zero tree depth in "
2136 "xattr tree block %llu\n", inode->i_ino,
2137 (unsigned long long)eb_bh->b_blocknr);
2138 ret = -EROFS;
2139 goto out;
2140 }
2141 }
2142
2143 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
2144 rec = &el->l_recs[i];
2145
2146 if (le32_to_cpu(rec->e_cpos) <= name_hash) {
2147 e_blkno = le64_to_cpu(rec->e_blkno);
2148 break;
2149 }
2150 }
2151
2152 if (!e_blkno) {
2153 ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
2154 "record (%u, %u, 0) in xattr", inode->i_ino,
2155 le32_to_cpu(rec->e_cpos),
2156 ocfs2_rec_clusters(el, rec));
2157 ret = -EROFS;
2158 goto out;
2159 }
2160
2161 *p_blkno = le64_to_cpu(rec->e_blkno);
2162 *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
2163 if (e_cpos)
2164 *e_cpos = le32_to_cpu(rec->e_cpos);
2165out:
2166 brelse(eb_bh);
2167 return ret;
2168}
2169
2170typedef int (xattr_bucket_func)(struct inode *inode,
2171 struct ocfs2_xattr_bucket *bucket,
2172 void *para);
2173
589dc260
TM		 2174static int ocfs2_find_xe_in_bucket(struct inode *inode,
2175 struct buffer_head *header_bh,
2176 int name_index,
2177 const char *name,
2178 u32 name_hash,
2179 u16 *xe_index,
2180 int *found)
2181{
2182 int i, ret = 0, cmp = 1, block_off, new_offset;
2183 struct ocfs2_xattr_header *xh =
2184 (struct ocfs2_xattr_header *)header_bh->b_data;
2185 size_t name_len = strlen(name);
2186 struct ocfs2_xattr_entry *xe = NULL;
2187 struct buffer_head *name_bh = NULL;
2188 char *xe_name;
2189
2190 /*
2191 * We don't use binary search in the bucket because there
2192 * may be multiple entries with the same name hash.
2193 */
2194 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
2195 xe = &xh->xh_entries[i];
2196
2197 if (name_hash > le32_to_cpu(xe->xe_name_hash))
2198 continue;
2199 else if (name_hash < le32_to_cpu(xe->xe_name_hash))
2200 break;
2201
2202 cmp = name_index - ocfs2_xattr_get_type(xe);
2203 if (!cmp)
2204 cmp = name_len - xe->xe_name_len;
2205 if (cmp)
2206 continue;
2207
2208 ret = ocfs2_xattr_bucket_get_name_value(inode,
2209 xh,
2210 i,
2211 &block_off,
2212 &new_offset);
2213 if (ret) {
2214 mlog_errno(ret);
2215 break;
2216 }
2217
2218 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
2219 header_bh->b_blocknr + block_off,
2220 &name_bh, OCFS2_BH_CACHED, inode);
2221 if (ret) {
2222 mlog_errno(ret);
2223 break;
2224 }
2225 xe_name = name_bh->b_data + new_offset;
2226
2227 cmp = memcmp(name, xe_name, name_len);
2228 brelse(name_bh);
2229 name_bh = NULL;
2230
2231 if (cmp == 0) {
2232 *xe_index = i;
2233 *found = 1;
2234 ret = 0;
2235 break;
2236 }
2237 }
2238
2239 return ret;
2240}
2241
2242/*
2243 * Find the specified xattr entry in a series of buckets.
2244 * This series start from p_blkno and last for num_clusters.
2245 * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
2246 * the num of the valid buckets.
2247 *
2248 * Return the buffer_head this xattr should reside in. And if the xattr's
2249 * hash is in the gap of 2 buckets, return the lower bucket.
2250 */
2251static int ocfs2_xattr_bucket_find(struct inode *inode,
2252 int name_index,
2253 const char *name,
2254 u32 name_hash,
2255 u64 p_blkno,
2256 u32 first_hash,
2257 u32 num_clusters,
2258 struct ocfs2_xattr_search *xs)
2259{
2260 int ret, found = 0;
2261 struct buffer_head *bh = NULL;
2262 struct buffer_head *lower_bh = NULL;
2263 struct ocfs2_xattr_header *xh = NULL;
2264 struct ocfs2_xattr_entry *xe = NULL;
2265 u16 index = 0;
2266 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2267 int low_bucket = 0, bucket, high_bucket;
2268 u32 last_hash;
2269 u64 blkno;
2270
2271 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), p_blkno,
2272 &bh, OCFS2_BH_CACHED, inode);
2273 if (ret) {
2274 mlog_errno(ret);
2275 goto out;
2276 }
2277
2278 xh = (struct ocfs2_xattr_header *)bh->b_data;
2279 high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
2280
2281 while (low_bucket <= high_bucket) {
2282 brelse(bh);
2283 bh = NULL;
2284 bucket = (low_bucket + high_bucket) / 2;
2285
2286 blkno = p_blkno + bucket * blk_per_bucket;
2287
2288 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno,
2289 &bh, OCFS2_BH_CACHED, inode);
2290 if (ret) {
2291 mlog_errno(ret);
2292 goto out;
2293 }
2294
2295 xh = (struct ocfs2_xattr_header *)bh->b_data;
2296 xe = &xh->xh_entries[0];
2297 if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
2298 high_bucket = bucket - 1;
2299 continue;
2300 }
2301
2302 /*
2303 * Check whether the hash of the last entry in our
2304 * bucket is larger than the search one.
2305 */
2306 xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
2307 last_hash = le32_to_cpu(xe->xe_name_hash);
2308
2309 /* record lower_bh which may be the insert place. */
2310 brelse(lower_bh);
2311 lower_bh = bh;
2312 bh = NULL;
2313
2314 if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
2315 low_bucket = bucket + 1;
2316 continue;
2317 }
2318
2319 /* the searched xattr should reside in this bucket if exists. */
2320 ret = ocfs2_find_xe_in_bucket(inode, lower_bh,
2321 name_index, name, name_hash,
2322 &index, &found);
2323 if (ret) {
2324 mlog_errno(ret);
2325 goto out;
2326 }
2327 break;
2328 }
2329
2330 /*
2331 * Record the bucket we have found.
2332 * When the xattr's hash value is in the gap of 2 buckets, we will
2333 * always set it to the previous bucket.
2334 */
2335 if (!lower_bh) {
2336 /*
2337 * We can't find any bucket whose first name_hash is less
2338 * than the find name_hash.
2339 */
2340 BUG_ON(bh->b_blocknr != p_blkno);
2341 lower_bh = bh;
2342 bh = NULL;
2343 }
2344 xs->bucket.bhs[0] = lower_bh;
2345 xs->bucket.xh = (struct ocfs2_xattr_header *)
2346 xs->bucket.bhs[0]->b_data;
2347 lower_bh = NULL;
2348
2349 xs->header = xs->bucket.xh;
2350 xs->base = xs->bucket.bhs[0]->b_data;
2351 xs->end = xs->base + inode->i_sb->s_blocksize;
2352
2353 if (found) {
2354 /*
2355 * If we have found the xattr enty, read all the blocks in
2356 * this bucket.
2357 */
2358 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb),
2359 xs->bucket.bhs[0]->b_blocknr + 1,
2360 blk_per_bucket - 1, &xs->bucket.bhs[1],
2361 OCFS2_BH_CACHED, inode);
2362 if (ret) {
2363 mlog_errno(ret);
2364 goto out;
2365 }
2366
2367 xs->here = &xs->header->xh_entries[index];
2368 mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name,
2369 (unsigned long long)xs->bucket.bhs[0]->b_blocknr, index);
2370 } else
2371 ret = -ENODATA;
2372
2373out:
2374 brelse(bh);
2375 brelse(lower_bh);
2376 return ret;
2377}
2378
2379static int ocfs2_xattr_index_block_find(struct inode *inode,
2380 struct buffer_head *root_bh,
2381 int name_index,
2382 const char *name,
2383 struct ocfs2_xattr_search *xs)
2384{
2385 int ret;
2386 struct ocfs2_xattr_block *xb =
2387 (struct ocfs2_xattr_block *)root_bh->b_data;
2388 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
2389 struct ocfs2_extent_list *el = &xb_root->xt_list;
2390 u64 p_blkno = 0;
2391 u32 first_hash, num_clusters = 0;
2392 u32 name_hash = ocfs2_xattr_hash_by_name(inode, name_index, name);
2393
2394 if (le16_to_cpu(el->l_next_free_rec) == 0)
2395 return -ENODATA;
2396
2397 mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n",
2398 name, name_hash, name_index);
2399
2400 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
2401 &num_clusters, el);
2402 if (ret) {
2403 mlog_errno(ret);
2404 goto out;
2405 }
2406
2407 BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
2408
2409 mlog(0, "find xattr extent rec %u clusters from %llu, the first hash "
2410 "in the rec is %u\n", num_clusters, p_blkno, first_hash);
2411
2412 ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
2413 p_blkno, first_hash, num_clusters, xs);
2414
2415out:
2416 return ret;
2417}
2418
0c044f0b
TM		 2419static int ocfs2_iterate_xattr_buckets(struct inode *inode,
2420 u64 blkno,
2421 u32 clusters,
2422 xattr_bucket_func *func,
2423 void *para)
2424{
2425 int i, j, ret = 0;
2426 int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2427 u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
2428 u32 num_buckets = clusters * bpc;
2429 struct ocfs2_xattr_bucket bucket;
2430
2431 memset(&bucket, 0, sizeof(bucket));
2432
2433 mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n",
2434 clusters, blkno);
2435
2436 for (i = 0; i < num_buckets; i++, blkno += blk_per_bucket) {
2437 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb),
2438 blkno, blk_per_bucket,
2439 bucket.bhs, OCFS2_BH_CACHED, inode);
2440 if (ret) {
2441 mlog_errno(ret);
2442 goto out;
2443 }
2444
2445 bucket.xh = (struct ocfs2_xattr_header *)bucket.bhs[0]->b_data;
2446 /*
2447 * The real bucket num in this series of blocks is stored
2448 * in the 1st bucket.
2449 */
2450 if (i == 0)
2451 num_buckets = le16_to_cpu(bucket.xh->xh_num_buckets);
2452
2453 mlog(0, "iterating xattr bucket %llu\n", blkno);
2454 if (func) {
2455 ret = func(inode, &bucket, para);
2456 if (ret) {
2457 mlog_errno(ret);
2458 break;
2459 }
2460 }
2461
2462 for (j = 0; j < blk_per_bucket; j++)
2463 brelse(bucket.bhs[j]);
2464 memset(&bucket, 0, sizeof(bucket));
2465 }
2466
2467out:
2468 for (j = 0; j < blk_per_bucket; j++)
2469 brelse(bucket.bhs[j]);
2470
2471 return ret;
2472}
2473
2474struct ocfs2_xattr_tree_list {
2475 char *buffer;
2476 size_t buffer_size;
2477};
2478
2479static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
2480 struct ocfs2_xattr_header *xh,
2481 int index,
2482 int *block_off,
2483 int *new_offset)
2484{
2485 u16 name_offset;
2486
2487 if (index < 0 || index >= le16_to_cpu(xh->xh_count))
2488 return -EINVAL;
2489
2490 name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
2491
2492 *block_off = name_offset >> inode->i_sb->s_blocksize_bits;
2493 *new_offset = name_offset % inode->i_sb->s_blocksize;
2494
2495 return 0;
2496}
2497
2498static int ocfs2_list_xattr_bucket(struct inode *inode,
2499 struct ocfs2_xattr_bucket *bucket,
2500 void *para)
2501{
2502 int ret = 0;
2503 struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
2504 size_t size;
2505 int i, block_off, new_offset;
2506
2507 for (i = 0 ; i < le16_to_cpu(bucket->xh->xh_count); i++) {
2508 struct ocfs2_xattr_entry *entry = &bucket->xh->xh_entries[i];
2509 struct xattr_handler *handler =
2510 ocfs2_xattr_handler(ocfs2_xattr_get_type(entry));
2511
2512 if (handler) {
2513 ret = ocfs2_xattr_bucket_get_name_value(inode,
2514 bucket->xh,
2515 i,
2516 &block_off,
2517 &new_offset);
2518 if (ret)
2519 break;
2520 size = handler->list(inode, xl->buffer, xl->buffer_size,
2521 bucket->bhs[block_off]->b_data +
2522 new_offset,
2523 entry->xe_name_len);
2524 if (xl->buffer) {
2525 if (size > xl->buffer_size)
2526 return -ERANGE;
2527 xl->buffer += size;
2528 }
2529 xl->buffer_size -= size;
2530 }
2531 }
2532
2533 return ret;
2534}
2535
2536static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
2537 struct ocfs2_xattr_tree_root *xt,
2538 char *buffer,
2539 size_t buffer_size)
2540{
2541 struct ocfs2_extent_list *el = &xt->xt_list;
2542 int ret = 0;
2543 u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
2544 u64 p_blkno = 0;
2545 struct ocfs2_xattr_tree_list xl = {
2546 .buffer = buffer,
2547 .buffer_size = buffer_size,
2548 };
2549
2550 if (le16_to_cpu(el->l_next_free_rec) == 0)
2551 return 0;
2552
2553 while (name_hash > 0) {
2554 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
2555 &e_cpos, &num_clusters, el);
2556 if (ret) {
2557 mlog_errno(ret);
2558 goto out;
2559 }
2560
2561 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
2562 ocfs2_list_xattr_bucket,
2563 &xl);
2564 if (ret) {
2565 mlog_errno(ret);
2566 goto out;
2567 }
2568
2569 if (e_cpos == 0)
2570 break;
2571
2572 name_hash = e_cpos - 1;
2573 }
2574
2575 ret = buffer_size - xl.buffer_size;
2576out:
2577 return ret;
2578}
01225596
TM		 2579
2580static int cmp_xe(const void *a, const void *b)
2581{
2582 const struct ocfs2_xattr_entry *l = a, *r = b;
2583 u32 l_hash = le32_to_cpu(l->xe_name_hash);
2584 u32 r_hash = le32_to_cpu(r->xe_name_hash);
2585
2586 if (l_hash > r_hash)
2587 return 1;
2588 if (l_hash < r_hash)
2589 return -1;
2590 return 0;
2591}
2592
2593static void swap_xe(void *a, void *b, int size)
2594{
2595 struct ocfs2_xattr_entry *l = a, *r = b, tmp;
2596
2597 tmp = *l;
2598 memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
2599 memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
2600}
2601
2602/*
2603 * When the ocfs2_xattr_block is filled up, new bucket will be created
2604 * and all the xattr entries will be moved to the new bucket.
2605 * Note: we need to sort the entries since they are not saved in order
2606 * in the ocfs2_xattr_block.
2607 */
2608static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
2609 struct buffer_head *xb_bh,
2610 struct buffer_head *xh_bh,
2611 struct buffer_head *data_bh)
2612{
2613 int i, blocksize = inode->i_sb->s_blocksize;
2614 u16 offset, size, off_change;
2615 struct ocfs2_xattr_entry *xe;
2616 struct ocfs2_xattr_block *xb =
2617 (struct ocfs2_xattr_block *)xb_bh->b_data;
2618 struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
2619 struct ocfs2_xattr_header *xh =
2620 (struct ocfs2_xattr_header *)xh_bh->b_data;
2621 u16 count = le16_to_cpu(xb_xh->xh_count);
2622 char *target = xh_bh->b_data, *src = xb_bh->b_data;
2623
2624 mlog(0, "cp xattr from block %llu to bucket %llu\n",
2625 (unsigned long long)xb_bh->b_blocknr,
2626 (unsigned long long)xh_bh->b_blocknr);
2627
2628 memset(xh_bh->b_data, 0, blocksize);
2629 if (data_bh)
2630 memset(data_bh->b_data, 0, blocksize);
2631 /*
2632 * Since the xe_name_offset is based on ocfs2_xattr_header,
2633 * there is a offset change corresponding to the change of
2634 * ocfs2_xattr_header's position.
2635 */
2636 off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
2637 xe = &xb_xh->xh_entries[count - 1];
2638 offset = le16_to_cpu(xe->xe_name_offset) + off_change;
2639 size = blocksize - offset;
2640
2641 /* copy all the names and values. */
2642 if (data_bh)
2643 target = data_bh->b_data;
2644 memcpy(target + offset, src + offset, size);
2645
2646 /* Init new header now. */
2647 xh->xh_count = xb_xh->xh_count;
2648 xh->xh_num_buckets = cpu_to_le16(1);
2649 xh->xh_name_value_len = cpu_to_le16(size);
2650 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
2651
2652 /* copy all the entries. */
2653 target = xh_bh->b_data;
2654 offset = offsetof(struct ocfs2_xattr_header, xh_entries);
2655 size = count * sizeof(struct ocfs2_xattr_entry);
2656 memcpy(target + offset, (char *)xb_xh + offset, size);
2657
2658 /* Change the xe offset for all the xe because of the move. */
2659 off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
2660 offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
2661 for (i = 0; i < count; i++)
2662 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
2663
2664 mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n",
2665 offset, size, off_change);
2666
2667 sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
2668 cmp_xe, swap_xe);
2669}
2670
2671/*
2672 * After we move xattr from block to index btree, we have to
2673 * update ocfs2_xattr_search to the new xe and base.
2674 *
2675 * When the entry is in xattr block, xattr_bh indicates the storage place.
2676 * While if the entry is in index b-tree, "bucket" indicates the
2677 * real place of the xattr.
2678 */
2679static int ocfs2_xattr_update_xattr_search(struct inode *inode,
2680 struct ocfs2_xattr_search *xs,
2681 struct buffer_head *old_bh,
2682 struct buffer_head *new_bh)
2683{
2684 int ret = 0;
2685 char *buf = old_bh->b_data;
2686 struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
2687 struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
2688 int i, blocksize = inode->i_sb->s_blocksize;
2689 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2690
2691 xs->bucket.bhs[0] = new_bh;
2692 get_bh(new_bh);
2693 xs->bucket.xh = (struct ocfs2_xattr_header *)xs->bucket.bhs[0]->b_data;
2694 xs->header = xs->bucket.xh;
2695
2696 xs->base = new_bh->b_data;
2697 xs->end = xs->base + inode->i_sb->s_blocksize;
2698
2699 if (!xs->not_found) {
2700 if (OCFS2_XATTR_BUCKET_SIZE != blocksize) {
2701 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb),
2702 xs->bucket.bhs[0]->b_blocknr + 1,
2703 blk_per_bucket - 1, &xs->bucket.bhs[1],
2704 OCFS2_BH_CACHED, inode);
2705 if (ret) {
2706 mlog_errno(ret);
2707 return ret;
2708 }
2709
2710 i = xs->here - old_xh->xh_entries;
2711 xs->here = &xs->header->xh_entries[i];
2712 }
2713 }
2714
2715 return ret;
2716}
2717
2718static int ocfs2_xattr_create_index_block(struct inode *inode,
2719 struct ocfs2_xattr_search *xs)
2720{
2721 int ret, credits = OCFS2_SUBALLOC_ALLOC;
2722 u32 bit_off, len;
2723 u64 blkno;
2724 handle_t *handle;
2725 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2726 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2727 struct ocfs2_alloc_context *data_ac;
2728 struct buffer_head *xh_bh = NULL, *data_bh = NULL;
2729 struct buffer_head *xb_bh = xs->xattr_bh;
2730 struct ocfs2_xattr_block *xb =
2731 (struct ocfs2_xattr_block *)xb_bh->b_data;
2732 struct ocfs2_xattr_tree_root *xr;
2733 u16 xb_flags = le16_to_cpu(xb->xb_flags);
2734 u16 bpb = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2735
2736 mlog(0, "create xattr index block for %llu\n",
2737 (unsigned long long)xb_bh->b_blocknr);
2738
2739 BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
2740
2741 ret = ocfs2_reserve_clusters(osb, 1, &data_ac);
2742 if (ret) {
2743 mlog_errno(ret);
2744 goto out;
2745 }
2746
2747 /*
2748 * XXX:
2749 * We can use this lock for now, and maybe move to a dedicated mutex
2750 * if performance becomes a problem later.
2751 */
2752 down_write(&oi->ip_alloc_sem);
2753
2754 /*
2755 * 3 more credits, one for xattr block update, one for the 1st block
2756 * of the new xattr bucket and one for the value/data.
2757 */
2758 credits += 3;
2759 handle = ocfs2_start_trans(osb, credits);
2760 if (IS_ERR(handle)) {
2761 ret = PTR_ERR(handle);
2762 mlog_errno(ret);
2763 goto out_sem;
2764 }
2765
2766 ret = ocfs2_journal_access(handle, inode, xb_bh,
2767 OCFS2_JOURNAL_ACCESS_WRITE);
2768 if (ret) {
2769 mlog_errno(ret);
2770 goto out_commit;
2771 }
2772
2773 ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off, &len);
2774 if (ret) {
2775 mlog_errno(ret);
2776 goto out_commit;
2777 }
2778
2779 /*
2780 * The bucket may spread in many blocks, and
2781 * we will only touch the 1st block and the last block
2782 * in the whole bucket(one for entry and one for data).
2783 */
2784 blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
2785
2786 mlog(0, "allocate 1 cluster from %llu to xattr block\n", blkno);
2787
2788 xh_bh = sb_getblk(inode->i_sb, blkno);
2789 if (!xh_bh) {
2790 ret = -EIO;
2791 mlog_errno(ret);
2792 goto out_commit;
2793 }
2794
2795 ocfs2_set_new_buffer_uptodate(inode, xh_bh);
2796
2797 ret = ocfs2_journal_access(handle, inode, xh_bh,
2798 OCFS2_JOURNAL_ACCESS_CREATE);
2799 if (ret) {
2800 mlog_errno(ret);
2801 goto out_commit;
2802 }
2803
2804 if (bpb > 1) {
2805 data_bh = sb_getblk(inode->i_sb, blkno + bpb - 1);
2806 if (!data_bh) {
2807 ret = -EIO;
2808 mlog_errno(ret);
2809 goto out_commit;
2810 }
2811
2812 ocfs2_set_new_buffer_uptodate(inode, data_bh);
2813
2814 ret = ocfs2_journal_access(handle, inode, data_bh,
2815 OCFS2_JOURNAL_ACCESS_CREATE);
2816 if (ret) {
2817 mlog_errno(ret);
2818 goto out_commit;
2819 }
2820 }
2821
2822 ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xh_bh, data_bh);
2823
2824 ocfs2_journal_dirty(handle, xh_bh);
2825 if (data_bh)
2826 ocfs2_journal_dirty(handle, data_bh);
2827
2828 ocfs2_xattr_update_xattr_search(inode, xs, xb_bh, xh_bh);
2829
2830 /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
2831 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
2832 offsetof(struct ocfs2_xattr_block, xb_attrs));
2833
2834 xr = &xb->xb_attrs.xb_root;
2835 xr->xt_clusters = cpu_to_le32(1);
2836 xr->xt_last_eb_blk = 0;
2837 xr->xt_list.l_tree_depth = 0;
2838 xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
2839 xr->xt_list.l_next_free_rec = cpu_to_le16(1);
2840
2841 xr->xt_list.l_recs[0].e_cpos = 0;
2842 xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
2843 xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
2844
2845 xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
2846
2847 ret = ocfs2_journal_dirty(handle, xb_bh);
2848 if (ret) {
2849 mlog_errno(ret);
2850 goto out_commit;
2851 }
2852
2853out_commit:
2854 ocfs2_commit_trans(osb, handle);
2855
2856out_sem:
2857 up_write(&oi->ip_alloc_sem);
2858
2859out:
2860 if (data_ac)
2861 ocfs2_free_alloc_context(data_ac);
2862
2863 brelse(xh_bh);
2864 brelse(data_bh);
2865
2866 return ret;
2867}
2868
2869static int cmp_xe_offset(const void *a, const void *b)
2870{
2871 const struct ocfs2_xattr_entry *l = a, *r = b;
2872 u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
2873 u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
2874
2875 if (l_name_offset < r_name_offset)
2876 return 1;
2877 if (l_name_offset > r_name_offset)
2878 return -1;
2879 return 0;
2880}
2881
2882/*
2883 * defrag a xattr bucket if we find that the bucket has some
2884 * holes beteen name/value pairs.
2885 * We will move all the name/value pairs to the end of the bucket
2886 * so that we can spare some space for insertion.
2887 */
2888static int ocfs2_defrag_xattr_bucket(struct inode *inode,
2889 struct ocfs2_xattr_bucket *bucket)
2890{
2891 int ret, i;
2892 size_t end, offset, len, value_len;
2893 struct ocfs2_xattr_header *xh;
2894 char *entries, *buf, *bucket_buf = NULL;
2895 u64 blkno = bucket->bhs[0]->b_blocknr;
2896 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2897 u16 xh_free_start;
2898 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2899 size_t blocksize = inode->i_sb->s_blocksize;
2900 handle_t *handle;
2901 struct buffer_head **bhs;
2902 struct ocfs2_xattr_entry *xe;
2903
2904 bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
2905 GFP_NOFS);
2906 if (!bhs)
2907 return -ENOMEM;
2908
2909 ret = ocfs2_read_blocks(osb, blkno, blk_per_bucket, bhs,
2910 OCFS2_BH_CACHED, inode);
2911 if (ret)
2912 goto out;
2913
2914 /*
2915 * In order to make the operation more efficient and generic,
2916 * we copy all the blocks into a contiguous memory and do the
2917 * defragment there, so if anything is error, we will not touch
2918 * the real block.
2919 */
2920 bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
2921 if (!bucket_buf) {
2922 ret = -EIO;
2923 goto out;
2924 }
2925
2926 buf = bucket_buf;
2927 for (i = 0; i < blk_per_bucket; i++, buf += blocksize)
2928 memcpy(buf, bhs[i]->b_data, blocksize);
2929
2930 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), blk_per_bucket);
2931 if (IS_ERR(handle)) {
2932 ret = PTR_ERR(handle);
2933 handle = NULL;
2934 mlog_errno(ret);
2935 goto out;
2936 }
2937
2938 for (i = 0; i < blk_per_bucket; i++) {
2939 ret = ocfs2_journal_access(handle, inode, bhs[i],
2940 OCFS2_JOURNAL_ACCESS_WRITE);
2941 if (ret < 0) {
2942 mlog_errno(ret);
2943 goto commit;
2944 }
2945 }
2946
2947 xh = (struct ocfs2_xattr_header *)bucket_buf;
2948 entries = (char *)xh->xh_entries;
2949 xh_free_start = le16_to_cpu(xh->xh_free_start);
2950
2951 mlog(0, "adjust xattr bucket in %llu, count = %u, "
2952 "xh_free_start = %u, xh_name_value_len = %u.\n",
2953 blkno, le16_to_cpu(xh->xh_count), xh_free_start,
2954 le16_to_cpu(xh->xh_name_value_len));
2955
2956 /*
2957 * sort all the entries by their offset.
2958 * the largest will be the first, so that we can
2959 * move them to the end one by one.
2960 */
2961 sort(entries, le16_to_cpu(xh->xh_count),
2962 sizeof(struct ocfs2_xattr_entry),
2963 cmp_xe_offset, swap_xe);
2964
2965 /* Move all name/values to the end of the bucket. */
2966 xe = xh->xh_entries;
2967 end = OCFS2_XATTR_BUCKET_SIZE;
2968 for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
2969 offset = le16_to_cpu(xe->xe_name_offset);
2970 if (ocfs2_xattr_is_local(xe))
2971 value_len = OCFS2_XATTR_SIZE(
2972 le64_to_cpu(xe->xe_value_size));
2973 else
2974 value_len = OCFS2_XATTR_ROOT_SIZE;
2975 len = OCFS2_XATTR_SIZE(xe->xe_name_len) + value_len;
2976
2977 /*
2978 * We must make sure that the name/value pair
2979 * exist in the same block. So adjust end to
2980 * the previous block end if needed.
2981 */
2982 if (((end - len) / blocksize !=
2983 (end - 1) / blocksize))
2984 end = end - end % blocksize;
2985
2986 if (end > offset + len) {
2987 memmove(bucket_buf + end - len,
2988 bucket_buf + offset, len);
2989 xe->xe_name_offset = cpu_to_le16(end - len);
2990 }
2991
2992 mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
2993 "bucket %llu\n", (unsigned long long)blkno);
2994
2995 end -= len;
2996 }
2997
2998 mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
2999 "bucket %llu\n", (unsigned long long)blkno);
3000
3001 if (xh_free_start == end)
3002 goto commit;
3003
3004 memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
3005 xh->xh_free_start = cpu_to_le16(end);
3006
3007 /* sort the entries by their name_hash. */
3008 sort(entries, le16_to_cpu(xh->xh_count),
3009 sizeof(struct ocfs2_xattr_entry),
3010 cmp_xe, swap_xe);
3011
3012 buf = bucket_buf;
3013 for (i = 0; i < blk_per_bucket; i++, buf += blocksize) {
3014 memcpy(bhs[i]->b_data, buf, blocksize);
3015 ocfs2_journal_dirty(handle, bhs[i]);
3016 }
3017
3018commit:
3019 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
3020out:
3021
3022 if (bhs) {
3023 for (i = 0; i < blk_per_bucket; i++)
3024 brelse(bhs[i]);
3025 }
3026 kfree(bhs);
3027
3028 kfree(bucket_buf);
3029 return ret;
3030}
3031
3032/*
3033 * Move half nums of the xattr bucket in the previous cluster to this new
3034 * cluster. We only touch the last cluster of the previous extend record.
3035 *
3036 * first_bh is the first buffer_head of a series of bucket in the same
3037 * extent rec and header_bh is the header of one bucket in this cluster.
3038 * They will be updated if we move the data header_bh contains to the new
3039 * cluster. first_hash will be set as the 1st xe's name_hash of the new cluster.
3040 */
3041static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
3042 handle_t *handle,
3043 struct buffer_head **first_bh,
3044 struct buffer_head **header_bh,
3045 u64 new_blkno,
3046 u64 prev_blkno,
3047 u32 num_clusters,
3048 u32 *first_hash)
3049{
3050 int i, ret, credits;
3051 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3052 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3053 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
3054 int blocksize = inode->i_sb->s_blocksize;
3055 struct buffer_head *old_bh, *new_bh, *prev_bh, *new_first_bh = NULL;
3056 struct ocfs2_xattr_header *new_xh;
3057 struct ocfs2_xattr_header *xh =
3058 (struct ocfs2_xattr_header *)((*first_bh)->b_data);
3059
3060 BUG_ON(le16_to_cpu(xh->xh_num_buckets) < num_buckets);
3061 BUG_ON(OCFS2_XATTR_BUCKET_SIZE == osb->s_clustersize);
3062
3063 prev_bh = *first_bh;
3064 get_bh(prev_bh);
3065 xh = (struct ocfs2_xattr_header *)prev_bh->b_data;
3066
3067 prev_blkno += (num_clusters - 1) * bpc + bpc / 2;
3068
3069 mlog(0, "move half of xattrs in cluster %llu to %llu\n",
3070 prev_blkno, new_blkno);
3071
3072 /*
3073 * We need to update the 1st half of the new cluster and
3074 * 1 more for the update of the 1st bucket of the previous
3075 * extent record.
3076 */
3077 credits = bpc / 2 + 1;
3078 ret = ocfs2_extend_trans(handle, credits);
3079 if (ret) {
3080 mlog_errno(ret);
3081 goto out;
3082 }
3083
3084 ret = ocfs2_journal_access(handle, inode, prev_bh,
3085 OCFS2_JOURNAL_ACCESS_WRITE);
3086 if (ret) {
3087 mlog_errno(ret);
3088 goto out;
3089 }
3090
3091 for (i = 0; i < bpc / 2; i++, prev_blkno++, new_blkno++) {
3092 old_bh = new_bh = NULL;
3093 new_bh = sb_getblk(inode->i_sb, new_blkno);
3094 if (!new_bh) {
3095 ret = -EIO;
3096 mlog_errno(ret);
3097 goto out;
3098 }
3099
3100 ocfs2_set_new_buffer_uptodate(inode, new_bh);
3101
3102 ret = ocfs2_journal_access(handle, inode, new_bh,
3103 OCFS2_JOURNAL_ACCESS_CREATE);
3104 if (ret < 0) {
3105 mlog_errno(ret);
3106 brelse(new_bh);
3107 goto out;
3108 }
3109
3110 ret = ocfs2_read_block(osb, prev_blkno,
3111 &old_bh, OCFS2_BH_CACHED, inode);
3112 if (ret < 0) {
3113 mlog_errno(ret);
3114 brelse(new_bh);
3115 goto out;
3116 }
3117
3118 memcpy(new_bh->b_data, old_bh->b_data, blocksize);
3119
3120 if (i == 0) {
3121 new_xh = (struct ocfs2_xattr_header *)new_bh->b_data;
3122 new_xh->xh_num_buckets = cpu_to_le16(num_buckets / 2);
3123
3124 if (first_hash)
3125 *first_hash = le32_to_cpu(
3126 new_xh->xh_entries[0].xe_name_hash);
3127 new_first_bh = new_bh;
3128 get_bh(new_first_bh);
3129 }
3130
3131 ocfs2_journal_dirty(handle, new_bh);
3132
3133 if (*header_bh == old_bh) {
3134 brelse(*header_bh);
3135 *header_bh = new_bh;
3136 get_bh(*header_bh);
3137
3138 brelse(*first_bh);
3139 *first_bh = new_first_bh;
3140 get_bh(*first_bh);
3141 }
3142 brelse(new_bh);
3143 brelse(old_bh);
3144 }
3145
3146 le16_add_cpu(&xh->xh_num_buckets, -(num_buckets / 2));
3147
3148 ocfs2_journal_dirty(handle, prev_bh);
3149out:
3150 brelse(prev_bh);
3151 brelse(new_first_bh);
3152 return ret;
3153}
3154
3155static int ocfs2_read_xattr_bucket(struct inode *inode,
3156 u64 blkno,
3157 struct buffer_head **bhs,
3158 int new)
3159{
3160 int ret = 0;
3161 u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3162
3163 if (!new)
3164 return ocfs2_read_blocks(OCFS2_SB(inode->i_sb), blkno,
3165 blk_per_bucket, bhs,
3166 OCFS2_BH_CACHED, inode);
3167
3168 for (i = 0; i < blk_per_bucket; i++) {
3169 bhs[i] = sb_getblk(inode->i_sb, blkno + i);
3170 if (bhs[i] == NULL) {
3171 ret = -EIO;
3172 mlog_errno(ret);
3173 break;
3174 }
3175 ocfs2_set_new_buffer_uptodate(inode, bhs[i]);
3176 }
3177
3178 return ret;
3179}
3180
3181/*
3182 * Move half num of the xattrs in old bucket(blk) to new bucket(new_blk).
3183 * first_hash will record the 1st hash of the new bucket.
3184 */
3185static int ocfs2_half_xattr_bucket(struct inode *inode,
3186 handle_t *handle,
3187 u64 blk,
3188 u64 new_blk,
3189 u32 *first_hash,
3190 int new_bucket_head)
3191{
3192 int ret, i;
3193 u16 count, start, len, name_value_len, xe_len, name_offset;
3194 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3195 struct buffer_head **s_bhs, **t_bhs = NULL;
3196 struct ocfs2_xattr_header *xh;
3197 struct ocfs2_xattr_entry *xe;
3198 int blocksize = inode->i_sb->s_blocksize;
3199
3200 mlog(0, "move half of xattrs from bucket %llu to %llu\n",
3201 blk, new_blk);
3202
3203 s_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
3204 if (!s_bhs)
3205 return -ENOMEM;
3206
3207 ret = ocfs2_read_xattr_bucket(inode, blk, s_bhs, 0);
3208 if (ret) {
3209 mlog_errno(ret);
3210 goto out;
3211 }
3212
3213 ret = ocfs2_journal_access(handle, inode, s_bhs[0],
3214 OCFS2_JOURNAL_ACCESS_WRITE);
3215 if (ret) {
3216 mlog_errno(ret);
3217 goto out;
3218 }
3219
3220 t_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
3221 if (!t_bhs) {
3222 ret = -ENOMEM;
3223 goto out;
3224 }
3225
3226 ret = ocfs2_read_xattr_bucket(inode, new_blk, t_bhs, new_bucket_head);
3227 if (ret) {
3228 mlog_errno(ret);
3229 goto out;
3230 }
3231
3232 for (i = 0; i < blk_per_bucket; i++) {
3233 ret = ocfs2_journal_access(handle, inode, t_bhs[i],
3234 OCFS2_JOURNAL_ACCESS_CREATE);
3235 if (ret) {
3236 mlog_errno(ret);
3237 goto out;
3238 }
3239 }
3240
3241 /* copy the whole bucket to the new first. */
3242 for (i = 0; i < blk_per_bucket; i++)
3243 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);
3244
3245 /* update the new bucket. */
3246 xh = (struct ocfs2_xattr_header *)t_bhs[0]->b_data;
3247 count = le16_to_cpu(xh->xh_count);
3248 start = count / 2;
3249
3250 /*
3251 * Calculate the total name/value len and xh_free_start for
3252 * the old bucket first.
3253 */
3254 name_offset = OCFS2_XATTR_BUCKET_SIZE;
3255 name_value_len = 0;
3256 for (i = 0; i < start; i++) {
3257 xe = &xh->xh_entries[i];
3258 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3259 if (ocfs2_xattr_is_local(xe))
3260 xe_len +=
3261 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3262 else
3263 xe_len += OCFS2_XATTR_ROOT_SIZE;
3264 name_value_len += xe_len;
3265 if (le16_to_cpu(xe->xe_name_offset) < name_offset)
3266 name_offset = le16_to_cpu(xe->xe_name_offset);
3267 }
3268
3269 /*
3270 * Now begin the modification to the new bucket.
3271 *
3272 * In the new bucket, We just move the xattr entry to the beginning
3273 * and don't touch the name/value. So there will be some holes in the
3274 * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
3275 * called.
3276 */
3277 xe = &xh->xh_entries[start];
3278 len = sizeof(struct ocfs2_xattr_entry) * (count - start);
3279 mlog(0, "mv xattr entry len %d from %d to %d\n", len,
ff1ec20e
MF		 3280 (int)((char *)xe - (char *)xh),
3281 (int)((char *)xh->xh_entries - (char *)xh));
01225596
TM		 3282 memmove((char *)xh->xh_entries, (char *)xe, len);
3283 xe = &xh->xh_entries[count - start];
3284 len = sizeof(struct ocfs2_xattr_entry) * start;
3285 memset((char *)xe, 0, len);
3286
3287 le16_add_cpu(&xh->xh_count, -start);
3288 le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
3289
3290 /* Calculate xh_free_start for the new bucket. */
3291 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
3292 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3293 xe = &xh->xh_entries[i];
3294 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3295 if (ocfs2_xattr_is_local(xe))
3296 xe_len +=
3297 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3298 else
3299 xe_len += OCFS2_XATTR_ROOT_SIZE;
3300 if (le16_to_cpu(xe->xe_name_offset) <
3301 le16_to_cpu(xh->xh_free_start))
3302 xh->xh_free_start = xe->xe_name_offset;
3303 }
3304
3305 /* set xh->xh_num_buckets for the new xh. */
3306 if (new_bucket_head)
3307 xh->xh_num_buckets = cpu_to_le16(1);
3308 else
3309 xh->xh_num_buckets = 0;
3310
3311 for (i = 0; i < blk_per_bucket; i++) {
3312 ocfs2_journal_dirty(handle, t_bhs[i]);
3313 if (ret)
3314 mlog_errno(ret);
3315 }
3316
3317 /* store the first_hash of the new bucket. */
3318 if (first_hash)
3319 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3320
3321 /*
3322 * Now only update the 1st block of the old bucket.
3323 * Please note that the entry has been sorted already above.
3324 */
3325 xh = (struct ocfs2_xattr_header *)s_bhs[0]->b_data;
3326 memset(&xh->xh_entries[start], 0,
3327 sizeof(struct ocfs2_xattr_entry) * (count - start));
3328 xh->xh_count = cpu_to_le16(start);
3329 xh->xh_free_start = cpu_to_le16(name_offset);
3330 xh->xh_name_value_len = cpu_to_le16(name_value_len);
3331
3332 ocfs2_journal_dirty(handle, s_bhs[0]);
3333 if (ret)
3334 mlog_errno(ret);
3335
3336out:
3337 if (s_bhs) {
3338 for (i = 0; i < blk_per_bucket; i++)
3339 brelse(s_bhs[i]);
3340 }
3341 kfree(s_bhs);
3342
3343 if (t_bhs) {
3344 for (i = 0; i < blk_per_bucket; i++)
3345 brelse(t_bhs[i]);
3346 }
3347 kfree(t_bhs);
3348
3349 return ret;
3350}
3351
3352/*
3353 * Copy xattr from one bucket to another bucket.
3354 *
3355 * The caller must make sure that the journal transaction
3356 * has enough space for journaling.
3357 */
3358static int ocfs2_cp_xattr_bucket(struct inode *inode,
3359 handle_t *handle,
3360 u64 s_blkno,
3361 u64 t_blkno,
3362 int t_is_new)
3363{
3364 int ret, i;
3365 int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3366 int blocksize = inode->i_sb->s_blocksize;
3367 struct buffer_head **s_bhs, **t_bhs = NULL;
3368
3369 BUG_ON(s_blkno == t_blkno);
3370
3371 mlog(0, "cp bucket %llu to %llu, target is %d\n",
3372 s_blkno, t_blkno, t_is_new);
3373
3374 s_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
3375 GFP_NOFS);
3376 if (!s_bhs)
3377 return -ENOMEM;
3378
3379 ret = ocfs2_read_xattr_bucket(inode, s_blkno, s_bhs, 0);
3380 if (ret)
3381 goto out;
3382
3383 t_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
3384 GFP_NOFS);
3385 if (!t_bhs) {
3386 ret = -ENOMEM;
3387 goto out;
3388 }
3389
3390 ret = ocfs2_read_xattr_bucket(inode, t_blkno, t_bhs, t_is_new);
3391 if (ret)
3392 goto out;
3393
3394 for (i = 0; i < blk_per_bucket; i++) {
3395 ret = ocfs2_journal_access(handle, inode, t_bhs[i],
3396 OCFS2_JOURNAL_ACCESS_WRITE);
3397 if (ret)
3398 goto out;
3399 }
3400
3401 for (i = 0; i < blk_per_bucket; i++) {
3402 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);
3403 ocfs2_journal_dirty(handle, t_bhs[i]);
3404 }
3405
3406out:
3407 if (s_bhs) {
3408 for (i = 0; i < blk_per_bucket; i++)
3409 brelse(s_bhs[i]);
3410 }
3411 kfree(s_bhs);
3412
3413 if (t_bhs) {
3414 for (i = 0; i < blk_per_bucket; i++)
3415 brelse(t_bhs[i]);
3416 }
3417 kfree(t_bhs);
3418
3419 return ret;
3420}
3421
3422/*
3423 * Copy one xattr cluster from src_blk to to_blk.
3424 * The to_blk will become the first bucket header of the cluster, so its
3425 * xh_num_buckets will be initialized as the bucket num in the cluster.
3426 */
3427static int ocfs2_cp_xattr_cluster(struct inode *inode,
3428 handle_t *handle,
3429 struct buffer_head *first_bh,
3430 u64 src_blk,
3431 u64 to_blk,
3432 u32 *first_hash)
3433{
3434 int i, ret, credits;
3435 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3436 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3437 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
3438 struct buffer_head *bh = NULL;
3439 struct ocfs2_xattr_header *xh;
3440 u64 to_blk_start = to_blk;
3441
3442 mlog(0, "cp xattrs from cluster %llu to %llu\n", src_blk, to_blk);
3443
3444 /*
3445 * We need to update the new cluster and 1 more for the update of
3446 * the 1st bucket of the previous extent rec.
3447 */
3448 credits = bpc + 1;
3449 ret = ocfs2_extend_trans(handle, credits);
3450 if (ret) {
3451 mlog_errno(ret);
3452 goto out;
3453 }
3454
3455 ret = ocfs2_journal_access(handle, inode, first_bh,
3456 OCFS2_JOURNAL_ACCESS_WRITE);
3457 if (ret) {
3458 mlog_errno(ret);
3459 goto out;
3460 }
3461
3462 for (i = 0; i < num_buckets; i++) {
3463 ret = ocfs2_cp_xattr_bucket(inode, handle,
3464 src_blk, to_blk, 1);
3465 if (ret) {
3466 mlog_errno(ret);
3467 goto out;
3468 }
3469
3470 src_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3471 to_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3472 }
3473
3474 /* update the old bucket header. */
3475 xh = (struct ocfs2_xattr_header *)first_bh->b_data;
3476 le16_add_cpu(&xh->xh_num_buckets, -num_buckets);
3477
3478 ocfs2_journal_dirty(handle, first_bh);
3479
3480 /* update the new bucket header. */
3481 ret = ocfs2_read_block(osb, to_blk_start, &bh, OCFS2_BH_CACHED, inode);
3482 if (ret < 0) {
3483 mlog_errno(ret);
3484 goto out;
3485 }
3486
3487 ret = ocfs2_journal_access(handle, inode, bh,
3488 OCFS2_JOURNAL_ACCESS_WRITE);
3489 if (ret) {
3490 mlog_errno(ret);
3491 goto out;
3492 }
3493
3494 xh = (struct ocfs2_xattr_header *)bh->b_data;
3495 xh->xh_num_buckets = cpu_to_le16(num_buckets);
3496
3497 ocfs2_journal_dirty(handle, bh);
3498
3499 if (first_hash)
3500 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3501out:
3502 brelse(bh);
3503 return ret;
3504}
3505
3506/*
3507 * Move half of the xattrs in this cluster to the new cluster.
3508 * This function should only be called when bucket size == cluster size.
3509 * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
3510 */
3511static int ocfs2_half_xattr_cluster(struct inode *inode,
3512 handle_t *handle,
3513 u64 prev_blk,
3514 u64 new_blk,
3515 u32 *first_hash)
3516{
3517 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3518 int ret, credits = 2 * blk_per_bucket;
3519
3520 BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
3521
3522 ret = ocfs2_extend_trans(handle, credits);
3523 if (ret) {
3524 mlog_errno(ret);
3525 return ret;
3526 }
3527
3528 /* Move half of the xattr in start_blk to the next bucket. */
3529 return ocfs2_half_xattr_bucket(inode, handle, prev_blk,
3530 new_blk, first_hash, 1);
3531}
3532
3533/*
3534 * Move some xattrs from the old cluster to the new one since they are not
3535 * contiguous in ocfs2 xattr tree.
3536 *
3537 * new_blk starts a new separate cluster, and we will move some xattrs from
3538 * prev_blk to it. v_start will be set as the first name hash value in this
3539 * new cluster so that it can be used as e_cpos during tree insertion and
3540 * don't collide with our original b-tree operations. first_bh and header_bh
3541 * will also be updated since they will be used in ocfs2_extend_xattr_bucket
3542 * to extend the insert bucket.
3543 *
3544 * The problem is how much xattr should we move to the new one and when should
3545 * we update first_bh and header_bh?
3546 * 1. If cluster size > bucket size, that means the previous cluster has more
3547 * than 1 bucket, so just move half nums of bucket into the new cluster and
3548 * update the first_bh and header_bh if the insert bucket has been moved
3549 * to the new cluster.
3550 * 2. If cluster_size == bucket_size:
3551 * a) If the previous extent rec has more than one cluster and the insert
3552 * place isn't in the last cluster, copy the entire last cluster to the
3553 * new one. This time, we don't need to upate the first_bh and header_bh
3554 * since they will not be moved into the new cluster.
3555 * b) Otherwise, move the bottom half of the xattrs in the last cluster into
3556 * the new one. And we set the extend flag to zero if the insert place is
3557 * moved into the new allocated cluster since no extend is needed.
3558 */
3559static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
3560 handle_t *handle,
3561 struct buffer_head **first_bh,
3562 struct buffer_head **header_bh,
3563 u64 new_blk,
3564 u64 prev_blk,
3565 u32 prev_clusters,
3566 u32 *v_start,
3567 int *extend)
3568{
3569 int ret = 0;
3570 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3571
3572 mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n",
3573 prev_blk, prev_clusters, new_blk);
3574
3575 if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1)
3576 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
3577 handle,
3578 first_bh,
3579 header_bh,
3580 new_blk,
3581 prev_blk,
3582 prev_clusters,
3583 v_start);
3584 else {
3585 u64 last_blk = prev_blk + bpc * (prev_clusters - 1);
3586
3587 if (prev_clusters > 1 && (*header_bh)->b_blocknr != last_blk)
3588 ret = ocfs2_cp_xattr_cluster(inode, handle, *first_bh,
3589 last_blk, new_blk,
3590 v_start);
3591 else {
3592 ret = ocfs2_half_xattr_cluster(inode, handle,
3593 last_blk, new_blk,
3594 v_start);
3595
3596 if ((*header_bh)->b_blocknr == last_blk && extend)
3597 *extend = 0;
3598 }
3599 }
3600
3601 return ret;
3602}
3603
3604/*
3605 * Add a new cluster for xattr storage.
3606 *
3607 * If the new cluster is contiguous with the previous one, it will be
3608 * appended to the same extent record, and num_clusters will be updated.
3609 * If not, we will insert a new extent for it and move some xattrs in
3610 * the last cluster into the new allocated one.
3611 * We also need to limit the maximum size of a btree leaf, otherwise we'll
3612 * lose the benefits of hashing because we'll have to search large leaves.
3613 * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
3614 * if it's bigger).
3615 *
3616 * first_bh is the first block of the previous extent rec and header_bh
3617 * indicates the bucket we will insert the new xattrs. They will be updated
3618 * when the header_bh is moved into the new cluster.
3619 */
3620static int ocfs2_add_new_xattr_cluster(struct inode *inode,
3621 struct buffer_head *root_bh,
3622 struct buffer_head **first_bh,
3623 struct buffer_head **header_bh,
3624 u32 *num_clusters,
3625 u32 prev_cpos,
3626 u64 prev_blkno,
3627 int *extend)
3628{
3629 int ret, credits;
3630 u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3631 u32 prev_clusters = *num_clusters;
3632 u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
3633 u64 block;
3634 handle_t *handle = NULL;
3635 struct ocfs2_alloc_context *data_ac = NULL;
3636 struct ocfs2_alloc_context *meta_ac = NULL;
3637 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
f99b9b7c 3638 struct ocfs2_extent_tree et;
01225596
TM		 3639
3640 mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, "
3641 "previous xattr blkno = %llu\n",
3642 (unsigned long long)OCFS2_I(inode)->ip_blkno,
3643 prev_cpos, prev_blkno);
3644
8d6220d6 3645 ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
f99b9b7c
JB		 3646
3647 ret = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
3648 &data_ac, &meta_ac);
01225596
TM		 3649 if (ret) {
3650 mlog_errno(ret);
3651 goto leave;
3652 }
3653
f99b9b7c
JB		 3654 credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el,
3655 clusters_to_add);
01225596
TM		 3656 handle = ocfs2_start_trans(osb, credits);
3657 if (IS_ERR(handle)) {
3658 ret = PTR_ERR(handle);
3659 handle = NULL;
3660 mlog_errno(ret);
3661 goto leave;
3662 }
3663
3664 ret = ocfs2_journal_access(handle, inode, root_bh,
3665 OCFS2_JOURNAL_ACCESS_WRITE);
3666 if (ret < 0) {
3667 mlog_errno(ret);
3668 goto leave;
3669 }
3670
3671 ret = __ocfs2_claim_clusters(osb, handle, data_ac, 1,
3672 clusters_to_add, &bit_off, &num_bits);
3673 if (ret < 0) {
3674 if (ret != -ENOSPC)
3675 mlog_errno(ret);
3676 goto leave;
3677 }
3678
3679 BUG_ON(num_bits > clusters_to_add);
3680
3681 block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
3682 mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n",
3683 num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
3684
3685 if (prev_blkno + prev_clusters * bpc == block &&
3686 (prev_clusters + num_bits) << osb->s_clustersize_bits <=
3687 OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
3688 /*
3689 * If this cluster is contiguous with the old one and
3690 * adding this new cluster, we don't surpass the limit of
3691 * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
3692 * initialized and used like other buckets in the previous
3693 * cluster.
3694 * So add it as a contiguous one. The caller will handle
3695 * its init process.
3696 */
3697 v_start = prev_cpos + prev_clusters;
3698 *num_clusters = prev_clusters + num_bits;
3699 mlog(0, "Add contiguous %u clusters to previous extent rec.\n",
3700 num_bits);
3701 } else {
3702 ret = ocfs2_adjust_xattr_cross_cluster(inode,
3703 handle,
3704 first_bh,
3705 header_bh,
3706 block,
3707 prev_blkno,
3708 prev_clusters,
3709 &v_start,
3710 extend);
3711 if (ret) {
3712 mlog_errno(ret);
3713 goto leave;
3714 }
3715 }
3716
28b8ca0b
TM		 3717 if (handle->h_buffer_credits < credits) {
3718 /*
3719 * The journal has been restarted before, and don't
3720 * have enough space for the insertion, so extend it
3721 * here.
3722 */
3723 ret = ocfs2_extend_trans(handle, credits);
3724 if (ret) {
3725 mlog_errno(ret);
3726 goto leave;
3727 }
3728 }
01225596
TM		 3729 mlog(0, "Insert %u clusters at block %llu for xattr at %u\n",
3730 num_bits, block, v_start);
f99b9b7c
JB		 3731 ret = ocfs2_insert_extent(osb, handle, inode, &et, v_start, block,
3732 num_bits, 0, meta_ac);
01225596
TM		 3733 if (ret < 0) {
3734 mlog_errno(ret);
3735 goto leave;
3736 }
3737
3738 ret = ocfs2_journal_dirty(handle, root_bh);
3739 if (ret < 0) {
3740 mlog_errno(ret);
3741 goto leave;
3742 }
3743
3744leave:
3745 if (handle)
3746 ocfs2_commit_trans(osb, handle);
3747 if (data_ac)
3748 ocfs2_free_alloc_context(data_ac);
3749 if (meta_ac)
3750 ocfs2_free_alloc_context(meta_ac);
3751
3752 return ret;
3753}
3754
3755/*
3756 * Extend a new xattr bucket and move xattrs to the end one by one until
3757 * We meet with start_bh. Only move half of the xattrs to the bucket after it.
3758 */
3759static int ocfs2_extend_xattr_bucket(struct inode *inode,
3760 struct buffer_head *first_bh,
3761 struct buffer_head *start_bh,
3762 u32 num_clusters)
3763{
3764 int ret, credits;
3765 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3766 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3767 u64 start_blk = start_bh->b_blocknr, end_blk;
3768 u32 num_buckets = num_clusters * ocfs2_xattr_buckets_per_cluster(osb);
3769 handle_t *handle;
3770 struct ocfs2_xattr_header *first_xh =
3771 (struct ocfs2_xattr_header *)first_bh->b_data;
3772 u16 bucket = le16_to_cpu(first_xh->xh_num_buckets);
3773
3774 mlog(0, "extend xattr bucket in %llu, xattr extend rec starting "
3775 "from %llu, len = %u\n", start_blk,
3776 (unsigned long long)first_bh->b_blocknr, num_clusters);
3777
3778 BUG_ON(bucket >= num_buckets);
3779
3780 end_blk = first_bh->b_blocknr + (bucket - 1) * blk_per_bucket;
3781
3782 /*
3783 * We will touch all the buckets after the start_bh(include it).
3784 * Add one more bucket and modify the first_bh.
3785 */
3786 credits = end_blk - start_blk + 2 * blk_per_bucket + 1;
3787 handle = ocfs2_start_trans(osb, credits);
3788 if (IS_ERR(handle)) {
3789 ret = PTR_ERR(handle);
3790 handle = NULL;
3791 mlog_errno(ret);
3792 goto out;
3793 }
3794
3795 ret = ocfs2_journal_access(handle, inode, first_bh,
3796 OCFS2_JOURNAL_ACCESS_WRITE);
3797 if (ret) {
3798 mlog_errno(ret);
3799 goto commit;
3800 }
3801
3802 while (end_blk != start_blk) {
3803 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
3804 end_blk + blk_per_bucket, 0);
3805 if (ret)
3806 goto commit;
3807 end_blk -= blk_per_bucket;
3808 }
3809
3810 /* Move half of the xattr in start_blk to the next bucket. */
3811 ret = ocfs2_half_xattr_bucket(inode, handle, start_blk,
3812 start_blk + blk_per_bucket, NULL, 0);
3813
3814 le16_add_cpu(&first_xh->xh_num_buckets, 1);
3815 ocfs2_journal_dirty(handle, first_bh);
3816
3817commit:
3818 ocfs2_commit_trans(osb, handle);
3819out:
3820 return ret;
3821}
3822
3823/*
3824 * Add new xattr bucket in an extent record and adjust the buckets accordingly.
3825 * xb_bh is the ocfs2_xattr_block.
3826 * We will move all the buckets starting from header_bh to the next place. As
3827 * for this one, half num of its xattrs will be moved to the next one.
3828 *
3829 * We will allocate a new cluster if current cluster is full and adjust
3830 * header_bh and first_bh if the insert place is moved to the new cluster.
3831 */
3832static int ocfs2_add_new_xattr_bucket(struct inode *inode,
3833 struct buffer_head *xb_bh,
3834 struct buffer_head *header_bh)
3835{
3836 struct ocfs2_xattr_header *first_xh = NULL;
3837 struct buffer_head *first_bh = NULL;
3838 struct ocfs2_xattr_block *xb =
3839 (struct ocfs2_xattr_block *)xb_bh->b_data;
3840 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3841 struct ocfs2_extent_list *el = &xb_root->xt_list;
3842 struct ocfs2_xattr_header *xh =
3843 (struct ocfs2_xattr_header *)header_bh->b_data;
3844 u32 name_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3845 struct super_block *sb = inode->i_sb;
3846 struct ocfs2_super *osb = OCFS2_SB(sb);
3847 int ret, num_buckets, extend = 1;
3848 u64 p_blkno;
3849 u32 e_cpos, num_clusters;
3850
3851 mlog(0, "Add new xattr bucket starting form %llu\n",
3852 (unsigned long long)header_bh->b_blocknr);
3853
3854 /*
3855 * Add refrence for header_bh here because it may be
3856 * changed in ocfs2_add_new_xattr_cluster and we need
3857 * to free it in the end.
3858 */
3859 get_bh(header_bh);
3860
3861 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
3862 &num_clusters, el);
3863 if (ret) {
3864 mlog_errno(ret);
3865 goto out;
3866 }
3867
3868 ret = ocfs2_read_block(osb, p_blkno,
3869 &first_bh, OCFS2_BH_CACHED, inode);
3870 if (ret) {
3871 mlog_errno(ret);
3872 goto out;
3873 }
3874
3875 num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
3876 first_xh = (struct ocfs2_xattr_header *)first_bh->b_data;
3877
3878 if (num_buckets == le16_to_cpu(first_xh->xh_num_buckets)) {
3879 ret = ocfs2_add_new_xattr_cluster(inode,
3880 xb_bh,
3881 &first_bh,
3882 &header_bh,
3883 &num_clusters,
3884 e_cpos,
3885 p_blkno,
3886 &extend);
3887 if (ret) {
3888 mlog_errno(ret);
3889 goto out;
3890 }
3891 }
3892
3893 if (extend)
3894 ret = ocfs2_extend_xattr_bucket(inode,
3895 first_bh,
3896 header_bh,
3897 num_clusters);
3898 if (ret)
3899 mlog_errno(ret);
3900out:
3901 brelse(first_bh);
3902 brelse(header_bh);
3903 return ret;
3904}
3905
3906static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode,
3907 struct ocfs2_xattr_bucket *bucket,
3908 int offs)
3909{
3910 int block_off = offs >> inode->i_sb->s_blocksize_bits;
3911
3912 offs = offs % inode->i_sb->s_blocksize;
3913 return bucket->bhs[block_off]->b_data + offs;
3914}
3915
3916/*
3917 * Handle the normal xattr set, including replace, delete and new.
3918 * When the bucket is empty, "is_empty" is set and the caller can
3919 * free this bucket.
3920 *
3921 * Note: "local" indicates the real data's locality. So we can't
3922 * just its bucket locality by its length.
3923 */
3924static void ocfs2_xattr_set_entry_normal(struct inode *inode,
3925 struct ocfs2_xattr_info *xi,
3926 struct ocfs2_xattr_search *xs,
3927 u32 name_hash,
3928 int local,
3929 int *is_empty)
3930{
3931 struct ocfs2_xattr_entry *last, *xe;
3932 int name_len = strlen(xi->name);
3933 struct ocfs2_xattr_header *xh = xs->header;
3934 u16 count = le16_to_cpu(xh->xh_count), start;
3935 size_t blocksize = inode->i_sb->s_blocksize;
3936 char *val;
3937 size_t offs, size, new_size;
3938
3939 last = &xh->xh_entries[count];
3940 if (!xs->not_found) {
3941 xe = xs->here;
3942 offs = le16_to_cpu(xe->xe_name_offset);
3943 if (ocfs2_xattr_is_local(xe))
3944 size = OCFS2_XATTR_SIZE(name_len) +
3945 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3946 else
3947 size = OCFS2_XATTR_SIZE(name_len) +
3948 OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
3949
3950 /*
3951 * If the new value will be stored outside, xi->value has been
3952 * initalized as an empty ocfs2_xattr_value_root, and the same
3953 * goes with xi->value_len, so we can set new_size safely here.
3954 * See ocfs2_xattr_set_in_bucket.
3955 */
3956 new_size = OCFS2_XATTR_SIZE(name_len) +
3957 OCFS2_XATTR_SIZE(xi->value_len);
3958
3959 le16_add_cpu(&xh->xh_name_value_len, -size);
3960 if (xi->value) {
3961 if (new_size > size)
3962 goto set_new_name_value;
3963
3964 /* Now replace the old value with new one. */
3965 if (local)
3966 xe->xe_value_size = cpu_to_le64(xi->value_len);
3967 else
3968 xe->xe_value_size = 0;
3969
3970 val = ocfs2_xattr_bucket_get_val(inode,
3971 &xs->bucket, offs);
3972 memset(val + OCFS2_XATTR_SIZE(name_len), 0,
3973 size - OCFS2_XATTR_SIZE(name_len));
3974 if (OCFS2_XATTR_SIZE(xi->value_len) > 0)
3975 memcpy(val + OCFS2_XATTR_SIZE(name_len),
3976 xi->value, xi->value_len);
3977
3978 le16_add_cpu(&xh->xh_name_value_len, new_size);
3979 ocfs2_xattr_set_local(xe, local);
3980 return;
3981 } else {
3982 /* Remove the old entry. */
3983 last -= 1;
3984 memmove(xe, xe + 1,
3985 (void *)last - (void *)xe);
3986 memset(last, 0, sizeof(struct ocfs2_xattr_entry));
3987 le16_add_cpu(&xh->xh_count, -1);
3988 if (xh->xh_count == 0 && is_empty)
3989 *is_empty = 1;
3990 return;
3991 }
3992 } else {
3993 /* find a new entry for insert. */
3994 int low = 0, high = count - 1, tmp;
3995 struct ocfs2_xattr_entry *tmp_xe;
3996
3997 while (low <= high) {
3998 tmp = (low + high) / 2;
3999 tmp_xe = &xh->xh_entries[tmp];
4000
4001 if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
4002 low = tmp + 1;
4003 else if (name_hash <
4004 le32_to_cpu(tmp_xe->xe_name_hash))
4005 high = tmp - 1;
4006 else
4007 break;
4008 }
4009
4010 xe = &xh->xh_entries[low];
4011 if (low != count)
4012 memmove(xe + 1, xe, (void *)last - (void *)xe);
4013
4014 le16_add_cpu(&xh->xh_count, 1);
4015 memset(xe, 0, sizeof(struct ocfs2_xattr_entry));
4016 xe->xe_name_hash = cpu_to_le32(name_hash);
4017 xe->xe_name_len = name_len;
4018 ocfs2_xattr_set_type(xe, xi->name_index);
4019 }
4020
4021set_new_name_value:
4022 /* Insert the new name+value. */
4023 size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len);
4024
4025 /*
4026 * We must make sure that the name/value pair
4027 * exists in the same block.
4028 */
4029 offs = le16_to_cpu(xh->xh_free_start);
4030 start = offs - size;
4031
4032 if (start >> inode->i_sb->s_blocksize_bits !=
4033 (offs - 1) >> inode->i_sb->s_blocksize_bits) {
4034 offs = offs - offs % blocksize;
4035 xh->xh_free_start = cpu_to_le16(offs);
4036 }
4037
4038 val = ocfs2_xattr_bucket_get_val(inode,
4039 &xs->bucket, offs - size);
4040 xe->xe_name_offset = cpu_to_le16(offs - size);
4041
4042 memset(val, 0, size);
4043 memcpy(val, xi->name, name_len);
4044 memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len);
4045
4046 xe->xe_value_size = cpu_to_le64(xi->value_len);
4047 ocfs2_xattr_set_local(xe, local);
4048 xs->here = xe;
4049 le16_add_cpu(&xh->xh_free_start, -size);
4050 le16_add_cpu(&xh->xh_name_value_len, size);
4051
4052 return;
4053}
4054
4055static int ocfs2_xattr_bucket_handle_journal(struct inode *inode,
4056 handle_t *handle,
4057 struct ocfs2_xattr_search *xs,
4058 struct buffer_head **bhs,
4059 u16 bh_num)
4060{
4061 int ret = 0, off, block_off;
4062 struct ocfs2_xattr_entry *xe = xs->here;
4063
4064 /*
4065 * First calculate all the blocks we should journal_access
4066 * and journal_dirty. The first block should always be touched.
4067 */
4068 ret = ocfs2_journal_dirty(handle, bhs[0]);
4069 if (ret)
4070 mlog_errno(ret);
4071
4072 /* calc the data. */
4073 off = le16_to_cpu(xe->xe_name_offset);
4074 block_off = off >> inode->i_sb->s_blocksize_bits;
4075 ret = ocfs2_journal_dirty(handle, bhs[block_off]);
4076 if (ret)
4077 mlog_errno(ret);
4078
4079 return ret;
4080}
4081
4082/*
4083 * Set the xattr entry in the specified bucket.
4084 * The bucket is indicated by xs->bucket and it should have the enough
4085 * space for the xattr insertion.
4086 */
4087static int ocfs2_xattr_set_entry_in_bucket(struct inode *inode,
4088 struct ocfs2_xattr_info *xi,
4089 struct ocfs2_xattr_search *xs,
4090 u32 name_hash,
4091 int local,
4092 int *bucket_empty)
4093{
4094 int i, ret;
4095 handle_t *handle = NULL;
4096 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4097 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4098
ff1ec20e
MF		 4099 mlog(0, "Set xattr entry len = %lu index = %d in bucket %llu\n",
4100 (unsigned long)xi->value_len, xi->name_index,
01225596
TM		 4101 (unsigned long long)xs->bucket.bhs[0]->b_blocknr);
4102
4103 if (!xs->bucket.bhs[1]) {
4104 ret = ocfs2_read_blocks(osb,
4105 xs->bucket.bhs[0]->b_blocknr + 1,
4106 blk_per_bucket - 1, &xs->bucket.bhs[1],
4107 OCFS2_BH_CACHED, inode);
4108 if (ret) {
4109 mlog_errno(ret);
4110 goto out;
4111 }
4112 }
4113
4114 handle = ocfs2_start_trans(osb, blk_per_bucket);
4115 if (IS_ERR(handle)) {
4116 ret = PTR_ERR(handle);
4117 handle = NULL;
4118 mlog_errno(ret);
4119 goto out;
4120 }
4121
4122 for (i = 0; i < blk_per_bucket; i++) {
4123 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[i],
4124 OCFS2_JOURNAL_ACCESS_WRITE);
4125 if (ret < 0) {
4126 mlog_errno(ret);
4127 goto out;
4128 }
4129 }
4130
4131 ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash,
4132 local, bucket_empty);
4133
4134 /*Only dirty the blocks we have touched in set xattr. */
4135 ret = ocfs2_xattr_bucket_handle_journal(inode, handle, xs,
4136 xs->bucket.bhs, blk_per_bucket);
4137 if (ret)
4138 mlog_errno(ret);
4139out:
4140 ocfs2_commit_trans(osb, handle);
4141
4142 return ret;
4143}
4144
4145static int ocfs2_xattr_value_update_size(struct inode *inode,
4146 struct buffer_head *xe_bh,
4147 struct ocfs2_xattr_entry *xe,
4148 u64 new_size)
4149{
4150 int ret;
4151 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4152 handle_t *handle = NULL;
4153
4154 handle = ocfs2_start_trans(osb, 1);
4155 if (handle == NULL) {
4156 ret = -ENOMEM;
4157 mlog_errno(ret);
4158 goto out;
4159 }
4160
4161 ret = ocfs2_journal_access(handle, inode, xe_bh,
4162 OCFS2_JOURNAL_ACCESS_WRITE);
4163 if (ret < 0) {
4164 mlog_errno(ret);
4165 goto out_commit;
4166 }
4167
4168 xe->xe_value_size = cpu_to_le64(new_size);
4169
4170 ret = ocfs2_journal_dirty(handle, xe_bh);
4171 if (ret < 0)
4172 mlog_errno(ret);
4173
4174out_commit:
4175 ocfs2_commit_trans(osb, handle);
4176out:
4177 return ret;
4178}
4179
4180/*
4181 * Truncate the specified xe_off entry in xattr bucket.
4182 * bucket is indicated by header_bh and len is the new length.
4183 * Both the ocfs2_xattr_value_root and the entry will be updated here.
4184 *
4185 * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
4186 */
4187static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
4188 struct buffer_head *header_bh,
4189 int xe_off,
4190 int len)
4191{
4192 int ret, offset;
4193 u64 value_blk;
4194 struct buffer_head *value_bh = NULL;
4195 struct ocfs2_xattr_value_root *xv;
4196 struct ocfs2_xattr_entry *xe;
4197 struct ocfs2_xattr_header *xh =
4198 (struct ocfs2_xattr_header *)header_bh->b_data;
4199 size_t blocksize = inode->i_sb->s_blocksize;
4200
4201 xe = &xh->xh_entries[xe_off];
4202
4203 BUG_ON(!xe || ocfs2_xattr_is_local(xe));
4204
4205 offset = le16_to_cpu(xe->xe_name_offset) +
4206 OCFS2_XATTR_SIZE(xe->xe_name_len);
4207
4208 value_blk = offset / blocksize;
4209
4210 /* We don't allow ocfs2_xattr_value to be stored in different block. */
4211 BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
4212 value_blk += header_bh->b_blocknr;
4213
4214 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), value_blk,
4215 &value_bh, OCFS2_BH_CACHED, inode);
4216 if (ret) {
4217 mlog_errno(ret);
4218 goto out;
4219 }
4220
4221 xv = (struct ocfs2_xattr_value_root *)
4222 (value_bh->b_data + offset % blocksize);
4223
4224 mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n",
4225 xe_off, (unsigned long long)header_bh->b_blocknr, len);
4226 ret = ocfs2_xattr_value_truncate(inode, value_bh, xv, len);
4227 if (ret) {
4228 mlog_errno(ret);
4229 goto out;
4230 }
4231
4232 ret = ocfs2_xattr_value_update_size(inode, header_bh, xe, len);
4233 if (ret) {
4234 mlog_errno(ret);
4235 goto out;
4236 }
4237
4238out:
4239 brelse(value_bh);
4240 return ret;
4241}
4242
4243static int ocfs2_xattr_bucket_value_truncate_xs(struct inode *inode,
4244 struct ocfs2_xattr_search *xs,
4245 int len)
4246{
4247 int ret, offset;
4248 struct ocfs2_xattr_entry *xe = xs->here;
4249 struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xs->base;
4250
4251 BUG_ON(!xs->bucket.bhs[0] || !xe || ocfs2_xattr_is_local(xe));
4252
4253 offset = xe - xh->xh_entries;
4254 ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket.bhs[0],
4255 offset, len);
4256 if (ret)
4257 mlog_errno(ret);
4258
4259 return ret;
4260}
4261
4262static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode,
4263 struct ocfs2_xattr_search *xs,
4264 char *val,
4265 int value_len)
4266{
4267 int offset;
4268 struct ocfs2_xattr_value_root *xv;
4269 struct ocfs2_xattr_entry *xe = xs->here;
4270
4271 BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe));
4272
4273 offset = le16_to_cpu(xe->xe_name_offset) +
4274 OCFS2_XATTR_SIZE(xe->xe_name_len);
4275
4276 xv = (struct ocfs2_xattr_value_root *)(xs->base + offset);
4277
4278 return __ocfs2_xattr_set_value_outside(inode, xv, val, value_len);
4279}
4280
4281/*
4282 * Remove the xattr bucket pointed by bucket_bh.
4283 * All the buckets after it in the same xattr extent rec will be
4284 * move forward one by one.
4285 */
4286static int ocfs2_rm_xattr_bucket(struct inode *inode,
4287 struct buffer_head *first_bh,
4288 struct ocfs2_xattr_bucket *bucket)
4289{
4290 int ret = 0, credits;
4291 struct ocfs2_xattr_header *xh =
4292 (struct ocfs2_xattr_header *)first_bh->b_data;
4293 u16 bucket_num = le16_to_cpu(xh->xh_num_buckets);
4294 u64 end, start = bucket->bhs[0]->b_blocknr;
4295 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4296 handle_t *handle;
4297 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4298
4299 end = first_bh->b_blocknr + (bucket_num - 1) * blk_per_bucket;
4300
4301 mlog(0, "rm xattr bucket %llu\n", start);
4302 /*
4303 * We need to update the first xattr_header and all the buckets starting
4304 * from start in this xattr rec.
4305 *
4306 * XXX: Should we empty the old last bucket here?
4307 */
4308 credits = 1 + end - start;
4309 handle = ocfs2_start_trans(osb, credits);
4310 if (IS_ERR(handle)) {
4311 ret = PTR_ERR(handle);
4312 mlog_errno(ret);
4313 return ret;
4314 }
4315
4316 ret = ocfs2_journal_access(handle, inode, first_bh,
4317 OCFS2_JOURNAL_ACCESS_WRITE);
4318 if (ret) {
4319 mlog_errno(ret);
4320 goto out_commit;
4321 }
4322
4323
4324 while (start < end) {
4325 ret = ocfs2_cp_xattr_bucket(inode, handle,
4326 start + blk_per_bucket,
4327 start, 0);
4328 if (ret) {
4329 mlog_errno(ret);
4330 goto out_commit;
4331 }
4332 start += blk_per_bucket;
4333 }
4334
4335 /* update the first_bh. */
4336 xh->xh_num_buckets = cpu_to_le16(bucket_num - 1);
4337 ocfs2_journal_dirty(handle, first_bh);
4338
4339out_commit:
4340 ocfs2_commit_trans(osb, handle);
4341 return ret;
4342}
4343
4344static int ocfs2_rm_xattr_cluster(struct inode *inode,
4345 struct buffer_head *root_bh,
4346 u64 blkno,
4347 u32 cpos,
4348 u32 len)
4349{
4350 int ret;
4351 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4352 struct inode *tl_inode = osb->osb_tl_inode;
4353 handle_t *handle;
4354 struct ocfs2_xattr_block *xb =
4355 (struct ocfs2_xattr_block *)root_bh->b_data;
01225596
TM		 4356 struct ocfs2_alloc_context *meta_ac = NULL;
4357 struct ocfs2_cached_dealloc_ctxt dealloc;
f99b9b7c
JB		 4358 struct ocfs2_extent_tree et;
4359
8d6220d6 4360 ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
01225596
TM		 4361
4362 ocfs2_init_dealloc_ctxt(&dealloc);
4363
4364 mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n",
4365 cpos, len, (unsigned long long)blkno);
4366
4367 ocfs2_remove_xattr_clusters_from_cache(inode, blkno, len);
4368
f99b9b7c 4369 ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
01225596
TM		 4370 if (ret) {
4371 mlog_errno(ret);
4372 return ret;
4373 }
4374
4375 mutex_lock(&tl_inode->i_mutex);
4376
4377 if (ocfs2_truncate_log_needs_flush(osb)) {
4378 ret = __ocfs2_flush_truncate_log(osb);
4379 if (ret < 0) {
4380 mlog_errno(ret);
4381 goto out;
4382 }
4383 }
4384
4385 handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
4386 if (handle == NULL) {
4387 ret = -ENOMEM;
4388 mlog_errno(ret);
4389 goto out;
4390 }
4391
4392 ret = ocfs2_journal_access(handle, inode, root_bh,
4393 OCFS2_JOURNAL_ACCESS_WRITE);
4394 if (ret) {
4395 mlog_errno(ret);
4396 goto out_commit;
4397 }
4398
f99b9b7c
JB		 4399 ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
4400 &dealloc);
01225596
TM		 4401 if (ret) {
4402 mlog_errno(ret);
4403 goto out_commit;
4404 }
4405
4406 le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
4407
4408 ret = ocfs2_journal_dirty(handle, root_bh);
4409 if (ret) {
4410 mlog_errno(ret);
4411 goto out_commit;
4412 }
4413
4414 ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
4415 if (ret)
4416 mlog_errno(ret);
4417
4418out_commit:
4419 ocfs2_commit_trans(osb, handle);
4420out:
4421 ocfs2_schedule_truncate_log_flush(osb, 1);
4422
4423 mutex_unlock(&tl_inode->i_mutex);
4424
4425 if (meta_ac)
4426 ocfs2_free_alloc_context(meta_ac);
4427
4428 ocfs2_run_deallocs(osb, &dealloc);
4429
4430 return ret;
4431}
4432
4433/*
4434 * Free the xattr bucket indicated by xs->bucket and if all the buckets
4435 * in the clusters is free, free the clusters also.
4436 */
4437static int ocfs2_xattr_bucket_shrink(struct inode *inode,
4438 struct ocfs2_xattr_info *xi,
4439 struct ocfs2_xattr_search *xs,
4440 u32 name_hash)
4441{
4442 int ret;
4443 u32 e_cpos, num_clusters;
4444 u64 p_blkno;
4445 struct buffer_head *first_bh = NULL;
4446 struct ocfs2_xattr_header *first_xh;
4447 struct ocfs2_xattr_block *xb =
4448 (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
4449
4450 BUG_ON(xs->header->xh_count != 0);
4451
4452 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
4453 &e_cpos, &num_clusters,
4454 &xb->xb_attrs.xb_root.xt_list);
4455 if (ret) {
4456 mlog_errno(ret);
4457 return ret;
4458 }
4459
4460 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), p_blkno,
4461 &first_bh, OCFS2_BH_CACHED, inode);
4462 if (ret) {
4463 mlog_errno(ret);
4464 return ret;
4465 }
4466
4467 ret = ocfs2_rm_xattr_bucket(inode, first_bh, &xs->bucket);
4468 if (ret) {
4469 mlog_errno(ret);
4470 goto out;
4471 }
4472
4473 first_xh = (struct ocfs2_xattr_header *)first_bh->b_data;
4474 if (first_xh->xh_num_buckets == 0)
4475 ret = ocfs2_rm_xattr_cluster(inode, xs->xattr_bh,
4476 p_blkno, e_cpos,
4477 num_clusters);
4478
4479out:
4480 brelse(first_bh);
4481 return ret;
4482}
4483
4484static void ocfs2_xattr_bucket_remove_xs(struct inode *inode,
4485 struct ocfs2_xattr_search *xs)
4486{
4487 handle_t *handle = NULL;
4488 struct ocfs2_xattr_header *xh = xs->bucket.xh;
4489 struct ocfs2_xattr_entry *last = &xh->xh_entries[
4490 le16_to_cpu(xh->xh_count) - 1];
4491 int ret = 0;
4492
4493 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1);
4494 if (IS_ERR(handle)) {
4495 ret = PTR_ERR(handle);
4496 mlog_errno(ret);
4497 return;
4498 }
4499
4500 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[0],
4501 OCFS2_JOURNAL_ACCESS_WRITE);
4502 if (ret) {
4503 mlog_errno(ret);
4504 goto out_commit;
4505 }
4506
4507 /* Remove the old entry. */
4508 memmove(xs->here, xs->here + 1,
4509 (void *)last - (void *)xs->here);
4510 memset(last, 0, sizeof(struct ocfs2_xattr_entry));
4511 le16_add_cpu(&xh->xh_count, -1);
4512
4513 ret = ocfs2_journal_dirty(handle, xs->bucket.bhs[0]);
4514 if (ret < 0)
4515 mlog_errno(ret);
4516out_commit:
4517 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
4518}
4519
4520/*
4521 * Set the xattr name/value in the bucket specified in xs.
4522 *
4523 * As the new value in xi may be stored in the bucket or in an outside cluster,
4524 * we divide the whole process into 3 steps:
4525 * 1. insert name/value in the bucket(ocfs2_xattr_set_entry_in_bucket)
4526 * 2. truncate of the outside cluster(ocfs2_xattr_bucket_value_truncate_xs)
4527 * 3. Set the value to the outside cluster(ocfs2_xattr_bucket_set_value_outside)
4528 * 4. If the clusters for the new outside value can't be allocated, we need
4529 * to free the xattr we allocated in set.
4530 */
4531static int ocfs2_xattr_set_in_bucket(struct inode *inode,
4532 struct ocfs2_xattr_info *xi,
4533 struct ocfs2_xattr_search *xs)
4534{
4535 int ret, local = 1, bucket_empty = 0;
4536 size_t value_len;
4537 char *val = (char *)xi->value;
4538 struct ocfs2_xattr_entry *xe = xs->here;
4539 u32 name_hash = ocfs2_xattr_hash_by_name(inode,
4540 xi->name_index, xi->name);
4541
4542 if (!xs->not_found && !ocfs2_xattr_is_local(xe)) {
4543 /*
4544 * We need to truncate the xattr storage first.
4545 *
4546 * If both the old and new value are stored to
4547 * outside block, we only need to truncate
4548 * the storage and then set the value outside.
4549 *
4550 * If the new value should be stored within block,
4551 * we should free all the outside block first and
4552 * the modification to the xattr block will be done
4553 * by following steps.
4554 */
4555 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
4556 value_len = xi->value_len;
4557 else
4558 value_len = 0;
4559
4560 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
4561 value_len);
4562 if (ret)
4563 goto out;
4564
4565 if (value_len)
4566 goto set_value_outside;
4567 }
4568
4569 value_len = xi->value_len;
4570 /* So we have to handle the inside block change now. */
4571 if (value_len > OCFS2_XATTR_INLINE_SIZE) {
4572 /*
4573 * If the new value will be stored outside of block,
4574 * initalize a new empty value root and insert it first.
4575 */
4576 local = 0;
4577 xi->value = &def_xv;
4578 xi->value_len = OCFS2_XATTR_ROOT_SIZE;
4579 }
4580
4581 ret = ocfs2_xattr_set_entry_in_bucket(inode, xi, xs, name_hash,
4582 local, &bucket_empty);
4583 if (ret) {
4584 mlog_errno(ret);
4585 goto out;
4586 }
4587
4588 if (value_len > OCFS2_XATTR_INLINE_SIZE) {
4589 /* allocate the space now for the outside block storage. */
4590 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
4591 value_len);
4592 if (ret) {
4593 mlog_errno(ret);
4594
4595 if (xs->not_found) {
4596 /*
4597 * We can't allocate enough clusters for outside
4598 * storage and we have allocated xattr already,
4599 * so need to remove it.
4600 */
4601 ocfs2_xattr_bucket_remove_xs(inode, xs);
4602 }
4603 goto out;
4604 }
4605 } else {
4606 if (bucket_empty)
4607 ret = ocfs2_xattr_bucket_shrink(inode, xi,
4608 xs, name_hash);
4609 goto out;
4610 }
4611
4612set_value_outside:
4613 ret = ocfs2_xattr_bucket_set_value_outside(inode, xs, val, value_len);
4614out:
4615 return ret;
4616}
4617
4618/* check whether the xattr bucket is filled up with the same hash value. */
4619static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
4620 struct ocfs2_xattr_bucket *bucket)
4621{
4622 struct ocfs2_xattr_header *xh = bucket->xh;
4623
4624 if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
4625 xh->xh_entries[0].xe_name_hash) {
4626 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
4627 "hash = %u\n",
4628 (unsigned long long)bucket->bhs[0]->b_blocknr,
4629 le32_to_cpu(xh->xh_entries[0].xe_name_hash));
4630 return -ENOSPC;
4631 }
4632
4633 return 0;
4634}
4635
4636static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
4637 struct ocfs2_xattr_info *xi,
4638 struct ocfs2_xattr_search *xs)
4639{
4640 struct ocfs2_xattr_header *xh;
4641 struct ocfs2_xattr_entry *xe;
4642 u16 count, header_size, xh_free_start;
4643 int i, free, max_free, need, old;
4644 size_t value_size = 0, name_len = strlen(xi->name);
4645 size_t blocksize = inode->i_sb->s_blocksize;
4646 int ret, allocation = 0;
4647 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4648
4649 mlog_entry("Set xattr %s in xattr index block\n", xi->name);
4650
4651try_again:
4652 xh = xs->header;
4653 count = le16_to_cpu(xh->xh_count);
4654 xh_free_start = le16_to_cpu(xh->xh_free_start);
4655 header_size = sizeof(struct ocfs2_xattr_header) +
4656 count * sizeof(struct ocfs2_xattr_entry);
4657 max_free = OCFS2_XATTR_BUCKET_SIZE -
4658 le16_to_cpu(xh->xh_name_value_len) - header_size;
4659
4660 mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size "
4661 "of %u which exceed block size\n",
4662 (unsigned long long)xs->bucket.bhs[0]->b_blocknr,
4663 header_size);
4664
4665 if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE)
4666 value_size = OCFS2_XATTR_ROOT_SIZE;
4667 else if (xi->value)
4668 value_size = OCFS2_XATTR_SIZE(xi->value_len);
4669
4670 if (xs->not_found)
4671 need = sizeof(struct ocfs2_xattr_entry) +
4672 OCFS2_XATTR_SIZE(name_len) + value_size;
4673 else {
4674 need = value_size + OCFS2_XATTR_SIZE(name_len);
4675
4676 /*
4677 * We only replace the old value if the new length is smaller
4678 * than the old one. Otherwise we will allocate new space in the
4679 * bucket to store it.
4680 */
4681 xe = xs->here;
4682 if (ocfs2_xattr_is_local(xe))
4683 old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
4684 else
4685 old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
4686
4687 if (old >= value_size)
4688 need = 0;
4689 }
4690
4691 free = xh_free_start - header_size;
4692 /*
4693 * We need to make sure the new name/value pair
4694 * can exist in the same block.
4695 */
4696 if (xh_free_start % blocksize < need)
4697 free -= xh_free_start % blocksize;
4698
4699 mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, "
4700 "need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len ="
4701 " %u\n", xs->not_found,
4702 (unsigned long long)xs->bucket.bhs[0]->b_blocknr,
4703 free, need, max_free, le16_to_cpu(xh->xh_free_start),
4704 le16_to_cpu(xh->xh_name_value_len));
4705
4706 if (free < need || count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
4707 if (need <= max_free &&
4708 count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
4709 /*
4710 * We can create the space by defragment. Since only the
4711 * name/value will be moved, the xe shouldn't be changed
4712 * in xs.
4713 */
4714 ret = ocfs2_defrag_xattr_bucket(inode, &xs->bucket);
4715 if (ret) {
4716 mlog_errno(ret);
4717 goto out;
4718 }
4719
4720 xh_free_start = le16_to_cpu(xh->xh_free_start);
4721 free = xh_free_start - header_size;
4722 if (xh_free_start % blocksize < need)
4723 free -= xh_free_start % blocksize;
4724
4725 if (free >= need)
4726 goto xattr_set;
4727
4728 mlog(0, "Can't get enough space for xattr insert by "
4729 "defragment. Need %u bytes, but we have %d, so "
4730 "allocate new bucket for it.\n", need, free);
4731 }
4732
4733 /*
4734 * We have to add new buckets or clusters and one
4735 * allocation should leave us enough space for insert.
4736 */
4737 BUG_ON(allocation);
4738
4739 /*
4740 * We do not allow for overlapping ranges between buckets. And
4741 * the maximum number of collisions we will allow for then is
4742 * one bucket's worth, so check it here whether we need to
4743 * add a new bucket for the insert.
4744 */
4745 ret = ocfs2_check_xattr_bucket_collision(inode, &xs->bucket);
4746 if (ret) {
4747 mlog_errno(ret);
4748 goto out;
4749 }
4750
4751 ret = ocfs2_add_new_xattr_bucket(inode,
4752 xs->xattr_bh,
4753 xs->bucket.bhs[0]);
4754 if (ret) {
4755 mlog_errno(ret);
4756 goto out;
4757 }
4758
4759 for (i = 0; i < blk_per_bucket; i++)
4760 brelse(xs->bucket.bhs[i]);
4761
4762 memset(&xs->bucket, 0, sizeof(xs->bucket));
4763
4764 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
4765 xi->name_index,
4766 xi->name, xs);
4767 if (ret && ret != -ENODATA)
4768 goto out;
4769 xs->not_found = ret;
4770 allocation = 1;
4771 goto try_again;
4772 }
4773
4774xattr_set:
4775 ret = ocfs2_xattr_set_in_bucket(inode, xi, xs);
4776out:
4777 mlog_exit(ret);
4778 return ret;
4779}
a3944256
TM		 4780
4781static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
4782 struct ocfs2_xattr_bucket *bucket,
4783 void *para)
4784{
4785 int ret = 0;
4786 struct ocfs2_xattr_header *xh = bucket->xh;
4787 u16 i;
4788 struct ocfs2_xattr_entry *xe;
4789
4790 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
4791 xe = &xh->xh_entries[i];
4792 if (ocfs2_xattr_is_local(xe))
4793 continue;
4794
4795 ret = ocfs2_xattr_bucket_value_truncate(inode,
4796 bucket->bhs[0],
4797 i, 0);
4798 if (ret) {
4799 mlog_errno(ret);
4800 break;
4801 }
4802 }
4803
4804 return ret;
4805}
4806
4807static int ocfs2_delete_xattr_index_block(struct inode *inode,
4808 struct buffer_head *xb_bh)
4809{
4810 struct ocfs2_xattr_block *xb =
4811 (struct ocfs2_xattr_block *)xb_bh->b_data;
4812 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
4813 int ret = 0;
4814 u32 name_hash = UINT_MAX, e_cpos, num_clusters;
4815 u64 p_blkno;
4816
4817 if (le16_to_cpu(el->l_next_free_rec) == 0)
4818 return 0;
4819
4820 while (name_hash > 0) {
4821 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
4822 &e_cpos, &num_clusters, el);
4823 if (ret) {
4824 mlog_errno(ret);
4825 goto out;
4826 }
4827
4828 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
4829 ocfs2_delete_xattr_in_bucket,
4830 NULL);
4831 if (ret) {
4832 mlog_errno(ret);
4833 goto out;
4834 }
4835
4836 ret = ocfs2_rm_xattr_cluster(inode, xb_bh,
4837 p_blkno, e_cpos, num_clusters);
4838 if (ret) {
4839 mlog_errno(ret);
4840 break;
4841 }
4842
4843 if (e_cpos == 0)
4844 break;
4845
4846 name_hash = e_cpos - 1;
4847 }
4848
4849out:
4850 return ret;
4851}
Linux kernel - Deliverables
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