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ocfs2: Attach xattr clusters to refcount tree.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ocfs2 / xattr.c
blob501539a733f4459d3deeaca984c097fb2e8802cb
1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * xattr.c
5 *
6 * Copyright (C) 2004, 2008 Oracle. All rights reserved.
7 *
8 * CREDITS:
9 * Lots of code in this file is copy from linux/fs/ext3/xattr.c.
10 * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public
14 * License version 2 as published by the Free Software Foundation.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 */
21
22 #include <linux/capability.h>
23 #include <linux/fs.h>
24 #include <linux/types.h>
25 #include <linux/slab.h>
26 #include <linux/highmem.h>
27 #include <linux/pagemap.h>
28 #include <linux/uio.h>
29 #include <linux/sched.h>
30 #include <linux/splice.h>
31 #include <linux/mount.h>
32 #include <linux/writeback.h>
33 #include <linux/falloc.h>
34 #include <linux/sort.h>
35 #include <linux/init.h>
36 #include <linux/module.h>
37 #include <linux/string.h>
38 #include <linux/security.h>
39
40 #define MLOG_MASK_PREFIX ML_XATTR
41 #include <cluster/masklog.h>
42
43 #include "ocfs2.h"
44 #include "alloc.h"
45 #include "blockcheck.h"
46 #include "dlmglue.h"
47 #include "file.h"
48 #include "symlink.h"
49 #include "sysfile.h"
50 #include "inode.h"
51 #include "journal.h"
52 #include "ocfs2_fs.h"
53 #include "suballoc.h"
54 #include "uptodate.h"
55 #include "buffer_head_io.h"
56 #include "super.h"
57 #include "xattr.h"
58 #include "refcounttree.h"
59
60 struct ocfs2_xattr_def_value_root {
61 struct ocfs2_xattr_value_root xv;
62 struct ocfs2_extent_rec er;
63 };
64
65 struct ocfs2_xattr_bucket {
66 /* The inode these xattrs are associated with */
67 struct inode *bu_inode;
68
69 /* The actual buffers that make up the bucket */
70 struct buffer_head *bu_bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET];
71
72 /* How many blocks make up one bucket for this filesystem */
73 int bu_blocks;
74 };
75
76 struct ocfs2_xattr_set_ctxt {
77 handle_t *handle;
78 struct ocfs2_alloc_context *meta_ac;
79 struct ocfs2_alloc_context *data_ac;
80 struct ocfs2_cached_dealloc_ctxt dealloc;
81 };
82
83 #define OCFS2_XATTR_ROOT_SIZE (sizeof(struct ocfs2_xattr_def_value_root))
84 #define OCFS2_XATTR_INLINE_SIZE 80
85 #define OCFS2_XATTR_HEADER_GAP 4
86 #define OCFS2_XATTR_FREE_IN_IBODY (OCFS2_MIN_XATTR_INLINE_SIZE \
87 - sizeof(struct ocfs2_xattr_header) \
88 - OCFS2_XATTR_HEADER_GAP)
89 #define OCFS2_XATTR_FREE_IN_BLOCK(ptr) ((ptr)->i_sb->s_blocksize \
90 - sizeof(struct ocfs2_xattr_block) \
91 - sizeof(struct ocfs2_xattr_header) \
92 - OCFS2_XATTR_HEADER_GAP)
93
94 static struct ocfs2_xattr_def_value_root def_xv = {
95 .xv.xr_list.l_count = cpu_to_le16(1),
96 };
97
98 struct xattr_handler *ocfs2_xattr_handlers[] = {
99 &ocfs2_xattr_user_handler,
100 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
101 &ocfs2_xattr_acl_access_handler,
102 &ocfs2_xattr_acl_default_handler,
103 #endif
104 &ocfs2_xattr_trusted_handler,
105 &ocfs2_xattr_security_handler,
106 NULL
107 };
108
109 static struct xattr_handler *ocfs2_xattr_handler_map[OCFS2_XATTR_MAX] = {
110 [OCFS2_XATTR_INDEX_USER] = &ocfs2_xattr_user_handler,
111 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
112 [OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS]
113 = &ocfs2_xattr_acl_access_handler,
114 [OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT]
115 = &ocfs2_xattr_acl_default_handler,
116 #endif
117 [OCFS2_XATTR_INDEX_TRUSTED] = &ocfs2_xattr_trusted_handler,
118 [OCFS2_XATTR_INDEX_SECURITY] = &ocfs2_xattr_security_handler,
119 };
120
121 struct ocfs2_xattr_info {
122 int name_index;
123 const char *name;
124 const void *value;
125 size_t value_len;
126 };
127
128 struct ocfs2_xattr_search {
129 struct buffer_head *inode_bh;
130 /*
131 * xattr_bh point to the block buffer head which has extended attribute
132 * when extended attribute in inode, xattr_bh is equal to inode_bh.
133 */
134 struct buffer_head *xattr_bh;
135 struct ocfs2_xattr_header *header;
136 struct ocfs2_xattr_bucket *bucket;
137 void *base;
138 void *end;
139 struct ocfs2_xattr_entry *here;
140 int not_found;
141 };
142
143 static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
144 struct ocfs2_xattr_header *xh,
145 int index,
146 int *block_off,
147 int *new_offset);
148
149 static int ocfs2_xattr_block_find(struct inode *inode,
150 int name_index,
151 const char *name,
152 struct ocfs2_xattr_search *xs);
153 static int ocfs2_xattr_index_block_find(struct inode *inode,
154 struct buffer_head *root_bh,
155 int name_index,
156 const char *name,
157 struct ocfs2_xattr_search *xs);
158
159 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
160 struct buffer_head *blk_bh,
161 char *buffer,
162 size_t buffer_size);
163
164 static int ocfs2_xattr_create_index_block(struct inode *inode,
165 struct ocfs2_xattr_search *xs,
166 struct ocfs2_xattr_set_ctxt *ctxt);
167
168 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
169 struct ocfs2_xattr_info *xi,
170 struct ocfs2_xattr_search *xs,
171 struct ocfs2_xattr_set_ctxt *ctxt);
172
173 typedef int (xattr_tree_rec_func)(struct inode *inode,
174 struct buffer_head *root_bh,
175 u64 blkno, u32 cpos, u32 len, void *para);
176 static int ocfs2_iterate_xattr_index_block(struct inode *inode,
177 struct buffer_head *root_bh,
178 xattr_tree_rec_func *rec_func,
179 void *para);
180 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
181 struct ocfs2_xattr_bucket *bucket,
182 void *para);
183 static int ocfs2_rm_xattr_cluster(struct inode *inode,
184 struct buffer_head *root_bh,
185 u64 blkno,
186 u32 cpos,
187 u32 len,
188 void *para);
189
190 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
191 u64 src_blk, u64 last_blk, u64 to_blk,
192 unsigned int start_bucket,
193 u32 *first_hash);
194 static int ocfs2_prepare_refcount_xattr(struct inode *inode,
195 struct ocfs2_dinode *di,
196 struct ocfs2_xattr_info *xi,
197 struct ocfs2_xattr_search *xis,
198 struct ocfs2_xattr_search *xbs,
199 struct ocfs2_refcount_tree **ref_tree,
200 int *meta_need,
201 int *credits);
202
203 static inline u16 ocfs2_xattr_buckets_per_cluster(struct ocfs2_super *osb)
204 {
205 return (1 << osb->s_clustersize_bits) / OCFS2_XATTR_BUCKET_SIZE;
206 }
207
208 static inline u16 ocfs2_blocks_per_xattr_bucket(struct super_block *sb)
209 {
210 return OCFS2_XATTR_BUCKET_SIZE / (1 << sb->s_blocksize_bits);
211 }
212
213 static inline u16 ocfs2_xattr_max_xe_in_bucket(struct super_block *sb)
214 {
215 u16 len = sb->s_blocksize -
216 offsetof(struct ocfs2_xattr_header, xh_entries);
217
218 return len / sizeof(struct ocfs2_xattr_entry);
219 }
220
221 #define bucket_blkno(_b) ((_b)->bu_bhs[0]->b_blocknr)
222 #define bucket_block(_b, _n) ((_b)->bu_bhs[(_n)]->b_data)
223 #define bucket_xh(_b) ((struct ocfs2_xattr_header *)bucket_block((_b), 0))
224
225 static struct ocfs2_xattr_bucket *ocfs2_xattr_bucket_new(struct inode *inode)
226 {
227 struct ocfs2_xattr_bucket *bucket;
228 int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
229
230 BUG_ON(blks > OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET);
231
232 bucket = kzalloc(sizeof(struct ocfs2_xattr_bucket), GFP_NOFS);
233 if (bucket) {
234 bucket->bu_inode = inode;
235 bucket->bu_blocks = blks;
236 }
237
238 return bucket;
239 }
240
241 static void ocfs2_xattr_bucket_relse(struct ocfs2_xattr_bucket *bucket)
242 {
243 int i;
244
245 for (i = 0; i < bucket->bu_blocks; i++) {
246 brelse(bucket->bu_bhs[i]);
247 bucket->bu_bhs[i] = NULL;
248 }
249 }
250
251 static void ocfs2_xattr_bucket_free(struct ocfs2_xattr_bucket *bucket)
252 {
253 if (bucket) {
254 ocfs2_xattr_bucket_relse(bucket);
255 bucket->bu_inode = NULL;
256 kfree(bucket);
257 }
258 }
259
260 /*
261 * A bucket that has never been written to disk doesn't need to be
262 * read. We just need the buffer_heads. Don't call this for
263 * buckets that are already on disk. ocfs2_read_xattr_bucket() initializes
264 * them fully.
265 */
266 static int ocfs2_init_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
267 u64 xb_blkno)
268 {
269 int i, rc = 0;
270
271 for (i = 0; i < bucket->bu_blocks; i++) {
272 bucket->bu_bhs[i] = sb_getblk(bucket->bu_inode->i_sb,
273 xb_blkno + i);
274 if (!bucket->bu_bhs[i]) {
275 rc = -EIO;
276 mlog_errno(rc);
277 break;
278 }
279
280 if (!ocfs2_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
281 bucket->bu_bhs[i]))
282 ocfs2_set_new_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
283 bucket->bu_bhs[i]);
284 }
285
286 if (rc)
287 ocfs2_xattr_bucket_relse(bucket);
288 return rc;
289 }
290
291 /* Read the xattr bucket at xb_blkno */
292 static int ocfs2_read_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
293 u64 xb_blkno)
294 {
295 int rc;
296
297 rc = ocfs2_read_blocks(INODE_CACHE(bucket->bu_inode), xb_blkno,
298 bucket->bu_blocks, bucket->bu_bhs, 0,
299 NULL);
300 if (!rc) {
301 spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
302 rc = ocfs2_validate_meta_ecc_bhs(bucket->bu_inode->i_sb,
303 bucket->bu_bhs,
304 bucket->bu_blocks,
305 &bucket_xh(bucket)->xh_check);
306 spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
307 if (rc)
308 mlog_errno(rc);
309 }
310
311 if (rc)
312 ocfs2_xattr_bucket_relse(bucket);
313 return rc;
314 }
315
316 static int ocfs2_xattr_bucket_journal_access(handle_t *handle,
317 struct ocfs2_xattr_bucket *bucket,
318 int type)
319 {
320 int i, rc = 0;
321
322 for (i = 0; i < bucket->bu_blocks; i++) {
323 rc = ocfs2_journal_access(handle,
324 INODE_CACHE(bucket->bu_inode),
325 bucket->bu_bhs[i], type);
326 if (rc) {
327 mlog_errno(rc);
328 break;
329 }
330 }
331
332 return rc;
333 }
334
335 static void ocfs2_xattr_bucket_journal_dirty(handle_t *handle,
336 struct ocfs2_xattr_bucket *bucket)
337 {
338 int i;
339
340 spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
341 ocfs2_compute_meta_ecc_bhs(bucket->bu_inode->i_sb,
342 bucket->bu_bhs, bucket->bu_blocks,
343 &bucket_xh(bucket)->xh_check);
344 spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
345
346 for (i = 0; i < bucket->bu_blocks; i++)
347 ocfs2_journal_dirty(handle, bucket->bu_bhs[i]);
348 }
349
350 static void ocfs2_xattr_bucket_copy_data(struct ocfs2_xattr_bucket *dest,
351 struct ocfs2_xattr_bucket *src)
352 {
353 int i;
354 int blocksize = src->bu_inode->i_sb->s_blocksize;
355
356 BUG_ON(dest->bu_blocks != src->bu_blocks);
357 BUG_ON(dest->bu_inode != src->bu_inode);
358
359 for (i = 0; i < src->bu_blocks; i++) {
360 memcpy(bucket_block(dest, i), bucket_block(src, i),
361 blocksize);
362 }
363 }
364
365 static int ocfs2_validate_xattr_block(struct super_block *sb,
366 struct buffer_head *bh)
367 {
368 int rc;
369 struct ocfs2_xattr_block *xb =
370 (struct ocfs2_xattr_block *)bh->b_data;
371
372 mlog(0, "Validating xattr block %llu\n",
373 (unsigned long long)bh->b_blocknr);
374
375 BUG_ON(!buffer_uptodate(bh));
376
377 /*
378 * If the ecc fails, we return the error but otherwise
379 * leave the filesystem running. We know any error is
380 * local to this block.
381 */
382 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &xb->xb_check);
383 if (rc)
384 return rc;
385
386 /*
387 * Errors after here are fatal
388 */
389
390 if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
391 ocfs2_error(sb,
392 "Extended attribute block #%llu has bad "
393 "signature %.*s",
394 (unsigned long long)bh->b_blocknr, 7,
395 xb->xb_signature);
396 return -EINVAL;
397 }
398
399 if (le64_to_cpu(xb->xb_blkno) != bh->b_blocknr) {
400 ocfs2_error(sb,
401 "Extended attribute block #%llu has an "
402 "invalid xb_blkno of %llu",
403 (unsigned long long)bh->b_blocknr,
404 (unsigned long long)le64_to_cpu(xb->xb_blkno));
405 return -EINVAL;
406 }
407
408 if (le32_to_cpu(xb->xb_fs_generation) != OCFS2_SB(sb)->fs_generation) {
409 ocfs2_error(sb,
410 "Extended attribute block #%llu has an invalid "
411 "xb_fs_generation of #%u",
412 (unsigned long long)bh->b_blocknr,
413 le32_to_cpu(xb->xb_fs_generation));
414 return -EINVAL;
415 }
416
417 return 0;
418 }
419
420 static int ocfs2_read_xattr_block(struct inode *inode, u64 xb_blkno,
421 struct buffer_head **bh)
422 {
423 int rc;
424 struct buffer_head *tmp = *bh;
425
426 rc = ocfs2_read_block(INODE_CACHE(inode), xb_blkno, &tmp,
427 ocfs2_validate_xattr_block);
428
429 /* If ocfs2_read_block() got us a new bh, pass it up. */
430 if (!rc && !*bh)
431 *bh = tmp;
432
433 return rc;
434 }
435
436 static inline const char *ocfs2_xattr_prefix(int name_index)
437 {
438 struct xattr_handler *handler = NULL;
439
440 if (name_index > 0 && name_index < OCFS2_XATTR_MAX)
441 handler = ocfs2_xattr_handler_map[name_index];
442
443 return handler ? handler->prefix : NULL;
444 }
445
446 static u32 ocfs2_xattr_name_hash(struct inode *inode,
447 const char *name,
448 int name_len)
449 {
450 /* Get hash value of uuid from super block */
451 u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash;
452 int i;
453
454 /* hash extended attribute name */
455 for (i = 0; i < name_len; i++) {
456 hash = (hash << OCFS2_HASH_SHIFT) ^
457 (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
458 *name++;
459 }
460
461 return hash;
462 }
463
464 /*
465 * ocfs2_xattr_hash_entry()
466 *
467 * Compute the hash of an extended attribute.
468 */
469 static void ocfs2_xattr_hash_entry(struct inode *inode,
470 struct ocfs2_xattr_header *header,
471 struct ocfs2_xattr_entry *entry)
472 {
473 u32 hash = 0;
474 char *name = (char *)header + le16_to_cpu(entry->xe_name_offset);
475
476 hash = ocfs2_xattr_name_hash(inode, name, entry->xe_name_len);
477 entry->xe_name_hash = cpu_to_le32(hash);
478
479 return;
480 }
481
482 static int ocfs2_xattr_entry_real_size(int name_len, size_t value_len)
483 {
484 int size = 0;
485
486 if (value_len <= OCFS2_XATTR_INLINE_SIZE)
487 size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(value_len);
488 else
489 size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
490 size += sizeof(struct ocfs2_xattr_entry);
491
492 return size;
493 }
494
495 int ocfs2_calc_security_init(struct inode *dir,
496 struct ocfs2_security_xattr_info *si,
497 int *want_clusters,
498 int *xattr_credits,
499 struct ocfs2_alloc_context **xattr_ac)
500 {
501 int ret = 0;
502 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
503 int s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
504 si->value_len);
505
506 /*
507 * The max space of security xattr taken inline is
508 * 256(name) + 80(value) + 16(entry) = 352 bytes,
509 * So reserve one metadata block for it is ok.
510 */
511 if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
512 s_size > OCFS2_XATTR_FREE_IN_IBODY) {
513 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, xattr_ac);
514 if (ret) {
515 mlog_errno(ret);
516 return ret;
517 }
518 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
519 }
520
521 /* reserve clusters for xattr value which will be set in B tree*/
522 if (si->value_len > OCFS2_XATTR_INLINE_SIZE) {
523 int new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
524 si->value_len);
525
526 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
527 new_clusters);
528 *want_clusters += new_clusters;
529 }
530 return ret;
531 }
532
533 int ocfs2_calc_xattr_init(struct inode *dir,
534 struct buffer_head *dir_bh,
535 int mode,
536 struct ocfs2_security_xattr_info *si,
537 int *want_clusters,
538 int *xattr_credits,
539 int *want_meta)
540 {
541 int ret = 0;
542 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
543 int s_size = 0, a_size = 0, acl_len = 0, new_clusters;
544
545 if (si->enable)
546 s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
547 si->value_len);
548
549 if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
550 acl_len = ocfs2_xattr_get_nolock(dir, dir_bh,
551 OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT,
552 "", NULL, 0);
553 if (acl_len > 0) {
554 a_size = ocfs2_xattr_entry_real_size(0, acl_len);
555 if (S_ISDIR(mode))
556 a_size <<= 1;
557 } else if (acl_len != 0 && acl_len != -ENODATA) {
558 mlog_errno(ret);
559 return ret;
560 }
561 }
562
563 if (!(s_size + a_size))
564 return ret;
565
566 /*
567 * The max space of security xattr taken inline is
568 * 256(name) + 80(value) + 16(entry) = 352 bytes,
569 * The max space of acl xattr taken inline is
570 * 80(value) + 16(entry) * 2(if directory) = 192 bytes,
571 * when blocksize = 512, may reserve one more cluser for
572 * xattr bucket, otherwise reserve one metadata block
573 * for them is ok.
574 * If this is a new directory with inline data,
575 * we choose to reserve the entire inline area for
576 * directory contents and force an external xattr block.
577 */
578 if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
579 (S_ISDIR(mode) && ocfs2_supports_inline_data(osb)) ||
580 (s_size + a_size) > OCFS2_XATTR_FREE_IN_IBODY) {
581 *want_meta = *want_meta + 1;
582 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
583 }
584
585 if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE &&
586 (s_size + a_size) > OCFS2_XATTR_FREE_IN_BLOCK(dir)) {
587 *want_clusters += 1;
588 *xattr_credits += ocfs2_blocks_per_xattr_bucket(dir->i_sb);
589 }
590
591 /*
592 * reserve credits and clusters for xattrs which has large value
593 * and have to be set outside
594 */
595 if (si->enable && si->value_len > OCFS2_XATTR_INLINE_SIZE) {
596 new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
597 si->value_len);
598 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
599 new_clusters);
600 *want_clusters += new_clusters;
601 }
602 if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL &&
603 acl_len > OCFS2_XATTR_INLINE_SIZE) {
604 /* for directory, it has DEFAULT and ACCESS two types of acls */
605 new_clusters = (S_ISDIR(mode) ? 2 : 1) *
606 ocfs2_clusters_for_bytes(dir->i_sb, acl_len);
607 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
608 new_clusters);
609 *want_clusters += new_clusters;
610 }
611
612 return ret;
613 }
614
615 static int ocfs2_xattr_extend_allocation(struct inode *inode,
616 u32 clusters_to_add,
617 struct ocfs2_xattr_value_buf *vb,
618 struct ocfs2_xattr_set_ctxt *ctxt)
619 {
620 int status = 0;
621 handle_t *handle = ctxt->handle;
622 enum ocfs2_alloc_restarted why;
623 u32 prev_clusters, logical_start = le32_to_cpu(vb->vb_xv->xr_clusters);
624 struct ocfs2_extent_tree et;
625
626 mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add);
627
628 ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
629
630 status = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
631 OCFS2_JOURNAL_ACCESS_WRITE);
632 if (status < 0) {
633 mlog_errno(status);
634 goto leave;
635 }
636
637 prev_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
638 status = ocfs2_add_clusters_in_btree(handle,
639 &et,
640 &logical_start,
641 clusters_to_add,
642 0,
643 ctxt->data_ac,
644 ctxt->meta_ac,
645 &why);
646 if (status < 0) {
647 mlog_errno(status);
648 goto leave;
649 }
650
651 status = ocfs2_journal_dirty(handle, vb->vb_bh);
652 if (status < 0) {
653 mlog_errno(status);
654 goto leave;
655 }
656
657 clusters_to_add -= le32_to_cpu(vb->vb_xv->xr_clusters) - prev_clusters;
658
659 /*
660 * We should have already allocated enough space before the transaction,
661 * so no need to restart.
662 */
663 BUG_ON(why != RESTART_NONE || clusters_to_add);
664
665 leave:
666
667 return status;
668 }
669
670 static int __ocfs2_remove_xattr_range(struct inode *inode,
671 struct ocfs2_xattr_value_buf *vb,
672 u32 cpos, u32 phys_cpos, u32 len,
673 unsigned int ext_flags,
674 struct ocfs2_xattr_set_ctxt *ctxt)
675 {
676 int ret;
677 u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
678 handle_t *handle = ctxt->handle;
679 struct ocfs2_extent_tree et;
680
681 ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
682
683 ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
684 OCFS2_JOURNAL_ACCESS_WRITE);
685 if (ret) {
686 mlog_errno(ret);
687 goto out;
688 }
689
690 ret = ocfs2_remove_extent(handle, &et, cpos, len, ctxt->meta_ac,
691 &ctxt->dealloc);
692 if (ret) {
693 mlog_errno(ret);
694 goto out;
695 }
696
697 le32_add_cpu(&vb->vb_xv->xr_clusters, -len);
698
699 ret = ocfs2_journal_dirty(handle, vb->vb_bh);
700 if (ret) {
701 mlog_errno(ret);
702 goto out;
703 }
704
705 if (ext_flags & OCFS2_EXT_REFCOUNTED)
706 ret = ocfs2_decrease_refcount(inode, handle,
707 ocfs2_blocks_to_clusters(inode->i_sb,
708 phys_blkno),
709 len, ctxt->meta_ac, &ctxt->dealloc, 1);
710 else
711 ret = ocfs2_cache_cluster_dealloc(&ctxt->dealloc,
712 phys_blkno, len);
713 if (ret)
714 mlog_errno(ret);
715
716 out:
717 return ret;
718 }
719
720 static int ocfs2_xattr_shrink_size(struct inode *inode,
721 u32 old_clusters,
722 u32 new_clusters,
723 struct ocfs2_xattr_value_buf *vb,
724 struct ocfs2_xattr_set_ctxt *ctxt)
725 {
726 int ret = 0;
727 unsigned int ext_flags;
728 u32 trunc_len, cpos, phys_cpos, alloc_size;
729 u64 block;
730
731 if (old_clusters <= new_clusters)
732 return 0;
733
734 cpos = new_clusters;
735 trunc_len = old_clusters - new_clusters;
736 while (trunc_len) {
737 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
738 &alloc_size,
739 &vb->vb_xv->xr_list, &ext_flags);
740 if (ret) {
741 mlog_errno(ret);
742 goto out;
743 }
744
745 if (alloc_size > trunc_len)
746 alloc_size = trunc_len;
747
748 ret = __ocfs2_remove_xattr_range(inode, vb, cpos,
749 phys_cpos, alloc_size,
750 ext_flags, ctxt);
751 if (ret) {
752 mlog_errno(ret);
753 goto out;
754 }
755
756 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
757 ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode),
758 block, alloc_size);
759 cpos += alloc_size;
760 trunc_len -= alloc_size;
761 }
762
763 out:
764 return ret;
765 }
766
767 static int ocfs2_xattr_value_truncate(struct inode *inode,
768 struct ocfs2_xattr_value_buf *vb,
769 int len,
770 struct ocfs2_xattr_set_ctxt *ctxt)
771 {
772 int ret;
773 u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
774 u32 old_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
775
776 if (new_clusters == old_clusters)
777 return 0;
778
779 if (new_clusters > old_clusters)
780 ret = ocfs2_xattr_extend_allocation(inode,
781 new_clusters - old_clusters,
782 vb, ctxt);
783 else
784 ret = ocfs2_xattr_shrink_size(inode,
785 old_clusters, new_clusters,
786 vb, ctxt);
787
788 return ret;
789 }
790
791 static int ocfs2_xattr_list_entry(char *buffer, size_t size,
792 size_t *result, const char *prefix,
793 const char *name, int name_len)
794 {
795 char *p = buffer + *result;
796 int prefix_len = strlen(prefix);
797 int total_len = prefix_len + name_len + 1;
798
799 *result += total_len;
800
801 /* we are just looking for how big our buffer needs to be */
802 if (!size)
803 return 0;
804
805 if (*result > size)
806 return -ERANGE;
807
808 memcpy(p, prefix, prefix_len);
809 memcpy(p + prefix_len, name, name_len);
810 p[prefix_len + name_len] = '\0';
811
812 return 0;
813 }
814
815 static int ocfs2_xattr_list_entries(struct inode *inode,
816 struct ocfs2_xattr_header *header,
817 char *buffer, size_t buffer_size)
818 {
819 size_t result = 0;
820 int i, type, ret;
821 const char *prefix, *name;
822
823 for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
824 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
825 type = ocfs2_xattr_get_type(entry);
826 prefix = ocfs2_xattr_prefix(type);
827
828 if (prefix) {
829 name = (const char *)header +
830 le16_to_cpu(entry->xe_name_offset);
831
832 ret = ocfs2_xattr_list_entry(buffer, buffer_size,
833 &result, prefix, name,
834 entry->xe_name_len);
835 if (ret)
836 return ret;
837 }
838 }
839
840 return result;
841 }
842
843 static int ocfs2_xattr_ibody_list(struct inode *inode,
844 struct ocfs2_dinode *di,
845 char *buffer,
846 size_t buffer_size)
847 {
848 struct ocfs2_xattr_header *header = NULL;
849 struct ocfs2_inode_info *oi = OCFS2_I(inode);
850 int ret = 0;
851
852 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
853 return ret;
854
855 header = (struct ocfs2_xattr_header *)
856 ((void *)di + inode->i_sb->s_blocksize -
857 le16_to_cpu(di->i_xattr_inline_size));
858
859 ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size);
860
861 return ret;
862 }
863
864 static int ocfs2_xattr_block_list(struct inode *inode,
865 struct ocfs2_dinode *di,
866 char *buffer,
867 size_t buffer_size)
868 {
869 struct buffer_head *blk_bh = NULL;
870 struct ocfs2_xattr_block *xb;
871 int ret = 0;
872
873 if (!di->i_xattr_loc)
874 return ret;
875
876 ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
877 &blk_bh);
878 if (ret < 0) {
879 mlog_errno(ret);
880 return ret;
881 }
882
883 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
884 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
885 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
886 ret = ocfs2_xattr_list_entries(inode, header,
887 buffer, buffer_size);
888 } else
889 ret = ocfs2_xattr_tree_list_index_block(inode, blk_bh,
890 buffer, buffer_size);
891
892 brelse(blk_bh);
893
894 return ret;
895 }
896
897 ssize_t ocfs2_listxattr(struct dentry *dentry,
898 char *buffer,
899 size_t size)
900 {
901 int ret = 0, i_ret = 0, b_ret = 0;
902 struct buffer_head *di_bh = NULL;
903 struct ocfs2_dinode *di = NULL;
904 struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode);
905
906 if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
907 return -EOPNOTSUPP;
908
909 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
910 return ret;
911
912 ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0);
913 if (ret < 0) {
914 mlog_errno(ret);
915 return ret;
916 }
917
918 di = (struct ocfs2_dinode *)di_bh->b_data;
919
920 down_read(&oi->ip_xattr_sem);
921 i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size);
922 if (i_ret < 0)
923 b_ret = 0;
924 else {
925 if (buffer) {
926 buffer += i_ret;
927 size -= i_ret;
928 }
929 b_ret = ocfs2_xattr_block_list(dentry->d_inode, di,
930 buffer, size);
931 if (b_ret < 0)
932 i_ret = 0;
933 }
934 up_read(&oi->ip_xattr_sem);
935 ocfs2_inode_unlock(dentry->d_inode, 0);
936
937 brelse(di_bh);
938
939 return i_ret + b_ret;
940 }
941
942 static int ocfs2_xattr_find_entry(int name_index,
943 const char *name,
944 struct ocfs2_xattr_search *xs)
945 {
946 struct ocfs2_xattr_entry *entry;
947 size_t name_len;
948 int i, cmp = 1;
949
950 if (name == NULL)
951 return -EINVAL;
952
953 name_len = strlen(name);
954 entry = xs->here;
955 for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
956 cmp = name_index - ocfs2_xattr_get_type(entry);
957 if (!cmp)
958 cmp = name_len - entry->xe_name_len;
959 if (!cmp)
960 cmp = memcmp(name, (xs->base +
961 le16_to_cpu(entry->xe_name_offset)),
962 name_len);
963 if (cmp == 0)
964 break;
965 entry += 1;
966 }
967 xs->here = entry;
968
969 return cmp ? -ENODATA : 0;
970 }
971
972 static int ocfs2_xattr_get_value_outside(struct inode *inode,
973 struct ocfs2_xattr_value_root *xv,
974 void *buffer,
975 size_t len)
976 {
977 u32 cpos, p_cluster, num_clusters, bpc, clusters;
978 u64 blkno;
979 int i, ret = 0;
980 size_t cplen, blocksize;
981 struct buffer_head *bh = NULL;
982 struct ocfs2_extent_list *el;
983
984 el = &xv->xr_list;
985 clusters = le32_to_cpu(xv->xr_clusters);
986 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
987 blocksize = inode->i_sb->s_blocksize;
988
989 cpos = 0;
990 while (cpos < clusters) {
991 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
992 &num_clusters, el, NULL);
993 if (ret) {
994 mlog_errno(ret);
995 goto out;
996 }
997
998 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
999 /* Copy ocfs2_xattr_value */
1000 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1001 ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
1002 &bh, NULL);
1003 if (ret) {
1004 mlog_errno(ret);
1005 goto out;
1006 }
1007
1008 cplen = len >= blocksize ? blocksize : len;
1009 memcpy(buffer, bh->b_data, cplen);
1010 len -= cplen;
1011 buffer += cplen;
1012
1013 brelse(bh);
1014 bh = NULL;
1015 if (len == 0)
1016 break;
1017 }
1018 cpos += num_clusters;
1019 }
1020 out:
1021 return ret;
1022 }
1023
1024 static int ocfs2_xattr_ibody_get(struct inode *inode,
1025 int name_index,
1026 const char *name,
1027 void *buffer,
1028 size_t buffer_size,
1029 struct ocfs2_xattr_search *xs)
1030 {
1031 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1032 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1033 struct ocfs2_xattr_value_root *xv;
1034 size_t size;
1035 int ret = 0;
1036
1037 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
1038 return -ENODATA;
1039
1040 xs->end = (void *)di + inode->i_sb->s_blocksize;
1041 xs->header = (struct ocfs2_xattr_header *)
1042 (xs->end - le16_to_cpu(di->i_xattr_inline_size));
1043 xs->base = (void *)xs->header;
1044 xs->here = xs->header->xh_entries;
1045
1046 ret = ocfs2_xattr_find_entry(name_index, name, xs);
1047 if (ret)
1048 return ret;
1049 size = le64_to_cpu(xs->here->xe_value_size);
1050 if (buffer) {
1051 if (size > buffer_size)
1052 return -ERANGE;
1053 if (ocfs2_xattr_is_local(xs->here)) {
1054 memcpy(buffer, (void *)xs->base +
1055 le16_to_cpu(xs->here->xe_name_offset) +
1056 OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
1057 } else {
1058 xv = (struct ocfs2_xattr_value_root *)
1059 (xs->base + le16_to_cpu(
1060 xs->here->xe_name_offset) +
1061 OCFS2_XATTR_SIZE(xs->here->xe_name_len));
1062 ret = ocfs2_xattr_get_value_outside(inode, xv,
1063 buffer, size);
1064 if (ret < 0) {
1065 mlog_errno(ret);
1066 return ret;
1067 }
1068 }
1069 }
1070
1071 return size;
1072 }
1073
1074 static int ocfs2_xattr_block_get(struct inode *inode,
1075 int name_index,
1076 const char *name,
1077 void *buffer,
1078 size_t buffer_size,
1079 struct ocfs2_xattr_search *xs)
1080 {
1081 struct ocfs2_xattr_block *xb;
1082 struct ocfs2_xattr_value_root *xv;
1083 size_t size;
1084 int ret = -ENODATA, name_offset, name_len, i;
1085 int uninitialized_var(block_off);
1086
1087 xs->bucket = ocfs2_xattr_bucket_new(inode);
1088 if (!xs->bucket) {
1089 ret = -ENOMEM;
1090 mlog_errno(ret);
1091 goto cleanup;
1092 }
1093
1094 ret = ocfs2_xattr_block_find(inode, name_index, name, xs);
1095 if (ret) {
1096 mlog_errno(ret);
1097 goto cleanup;
1098 }
1099
1100 if (xs->not_found) {
1101 ret = -ENODATA;
1102 goto cleanup;
1103 }
1104
1105 xb = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1106 size = le64_to_cpu(xs->here->xe_value_size);
1107 if (buffer) {
1108 ret = -ERANGE;
1109 if (size > buffer_size)
1110 goto cleanup;
1111
1112 name_offset = le16_to_cpu(xs->here->xe_name_offset);
1113 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
1114 i = xs->here - xs->header->xh_entries;
1115
1116 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
1117 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
1118 bucket_xh(xs->bucket),
1119 i,
1120 &block_off,
1121 &name_offset);
1122 xs->base = bucket_block(xs->bucket, block_off);
1123 }
1124 if (ocfs2_xattr_is_local(xs->here)) {
1125 memcpy(buffer, (void *)xs->base +
1126 name_offset + name_len, size);
1127 } else {
1128 xv = (struct ocfs2_xattr_value_root *)
1129 (xs->base + name_offset + name_len);
1130 ret = ocfs2_xattr_get_value_outside(inode, xv,
1131 buffer, size);
1132 if (ret < 0) {
1133 mlog_errno(ret);
1134 goto cleanup;
1135 }
1136 }
1137 }
1138 ret = size;
1139 cleanup:
1140 ocfs2_xattr_bucket_free(xs->bucket);
1141
1142 brelse(xs->xattr_bh);
1143 xs->xattr_bh = NULL;
1144 return ret;
1145 }
1146
1147 int ocfs2_xattr_get_nolock(struct inode *inode,
1148 struct buffer_head *di_bh,
1149 int name_index,
1150 const char *name,
1151 void *buffer,
1152 size_t buffer_size)
1153 {
1154 int ret;
1155 struct ocfs2_dinode *di = NULL;
1156 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1157 struct ocfs2_xattr_search xis = {
1158 .not_found = -ENODATA,
1159 };
1160 struct ocfs2_xattr_search xbs = {
1161 .not_found = -ENODATA,
1162 };
1163
1164 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1165 return -EOPNOTSUPP;
1166
1167 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1168 ret = -ENODATA;
1169
1170 xis.inode_bh = xbs.inode_bh = di_bh;
1171 di = (struct ocfs2_dinode *)di_bh->b_data;
1172
1173 down_read(&oi->ip_xattr_sem);
1174 ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
1175 buffer_size, &xis);
1176 if (ret == -ENODATA && di->i_xattr_loc)
1177 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
1178 buffer_size, &xbs);
1179 up_read(&oi->ip_xattr_sem);
1180
1181 return ret;
1182 }
1183
1184 /* ocfs2_xattr_get()
1185 *
1186 * Copy an extended attribute into the buffer provided.
1187 * Buffer is NULL to compute the size of buffer required.
1188 */
1189 static int ocfs2_xattr_get(struct inode *inode,
1190 int name_index,
1191 const char *name,
1192 void *buffer,
1193 size_t buffer_size)
1194 {
1195 int ret;
1196 struct buffer_head *di_bh = NULL;
1197
1198 ret = ocfs2_inode_lock(inode, &di_bh, 0);
1199 if (ret < 0) {
1200 mlog_errno(ret);
1201 return ret;
1202 }
1203 ret = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
1204 name, buffer, buffer_size);
1205
1206 ocfs2_inode_unlock(inode, 0);
1207
1208 brelse(di_bh);
1209
1210 return ret;
1211 }
1212
1213 static int __ocfs2_xattr_set_value_outside(struct inode *inode,
1214 handle_t *handle,
1215 struct ocfs2_xattr_value_buf *vb,
1216 const void *value,
1217 int value_len)
1218 {
1219 int ret = 0, i, cp_len;
1220 u16 blocksize = inode->i_sb->s_blocksize;
1221 u32 p_cluster, num_clusters;
1222 u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1223 u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
1224 u64 blkno;
1225 struct buffer_head *bh = NULL;
1226 unsigned int ext_flags;
1227 struct ocfs2_xattr_value_root *xv = vb->vb_xv;
1228
1229 BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
1230
1231 while (cpos < clusters) {
1232 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
1233 &num_clusters, &xv->xr_list,
1234 &ext_flags);
1235 if (ret) {
1236 mlog_errno(ret);
1237 goto out;
1238 }
1239
1240 BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
1241
1242 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
1243
1244 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1245 ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
1246 &bh, NULL);
1247 if (ret) {
1248 mlog_errno(ret);
1249 goto out;
1250 }
1251
1252 ret = ocfs2_journal_access(handle,
1253 INODE_CACHE(inode),
1254 bh,
1255 OCFS2_JOURNAL_ACCESS_WRITE);
1256 if (ret < 0) {
1257 mlog_errno(ret);
1258 goto out;
1259 }
1260
1261 cp_len = value_len > blocksize ? blocksize : value_len;
1262 memcpy(bh->b_data, value, cp_len);
1263 value_len -= cp_len;
1264 value += cp_len;
1265 if (cp_len < blocksize)
1266 memset(bh->b_data + cp_len, 0,
1267 blocksize - cp_len);
1268
1269 ret = ocfs2_journal_dirty(handle, bh);
1270 if (ret < 0) {
1271 mlog_errno(ret);
1272 goto out;
1273 }
1274 brelse(bh);
1275 bh = NULL;
1276
1277 /*
1278 * XXX: do we need to empty all the following
1279 * blocks in this cluster?
1280 */
1281 if (!value_len)
1282 break;
1283 }
1284 cpos += num_clusters;
1285 }
1286 out:
1287 brelse(bh);
1288
1289 return ret;
1290 }
1291
1292 static int ocfs2_xattr_cleanup(struct inode *inode,
1293 handle_t *handle,
1294 struct ocfs2_xattr_info *xi,
1295 struct ocfs2_xattr_search *xs,
1296 struct ocfs2_xattr_value_buf *vb,
1297 size_t offs)
1298 {
1299 int ret = 0;
1300 size_t name_len = strlen(xi->name);
1301 void *val = xs->base + offs;
1302 size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1303
1304 ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
1305 OCFS2_JOURNAL_ACCESS_WRITE);
1306 if (ret) {
1307 mlog_errno(ret);
1308 goto out;
1309 }
1310 /* Decrease xattr count */
1311 le16_add_cpu(&xs->header->xh_count, -1);
1312 /* Remove the xattr entry and tree root which has already be set*/
1313 memset((void *)xs->here, 0, sizeof(struct ocfs2_xattr_entry));
1314 memset(val, 0, size);
1315
1316 ret = ocfs2_journal_dirty(handle, vb->vb_bh);
1317 if (ret < 0)
1318 mlog_errno(ret);
1319 out:
1320 return ret;
1321 }
1322
1323 static int ocfs2_xattr_update_entry(struct inode *inode,
1324 handle_t *handle,
1325 struct ocfs2_xattr_info *xi,
1326 struct ocfs2_xattr_search *xs,
1327 struct ocfs2_xattr_value_buf *vb,
1328 size_t offs)
1329 {
1330 int ret;
1331
1332 ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
1333 OCFS2_JOURNAL_ACCESS_WRITE);
1334 if (ret) {
1335 mlog_errno(ret);
1336 goto out;
1337 }
1338
1339 xs->here->xe_name_offset = cpu_to_le16(offs);
1340 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1341 if (xi->value_len <= OCFS2_XATTR_INLINE_SIZE)
1342 ocfs2_xattr_set_local(xs->here, 1);
1343 else
1344 ocfs2_xattr_set_local(xs->here, 0);
1345 ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1346
1347 ret = ocfs2_journal_dirty(handle, vb->vb_bh);
1348 if (ret < 0)
1349 mlog_errno(ret);
1350 out:
1351 return ret;
1352 }
1353
1354 /*
1355 * ocfs2_xattr_set_value_outside()
1356 *
1357 * Set large size value in B tree.
1358 */
1359 static int ocfs2_xattr_set_value_outside(struct inode *inode,
1360 struct ocfs2_xattr_info *xi,
1361 struct ocfs2_xattr_search *xs,
1362 struct ocfs2_xattr_set_ctxt *ctxt,
1363 struct ocfs2_xattr_value_buf *vb,
1364 size_t offs)
1365 {
1366 size_t name_len = strlen(xi->name);
1367 void *val = xs->base + offs;
1368 struct ocfs2_xattr_value_root *xv = NULL;
1369 size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1370 int ret = 0;
1371
1372 memset(val, 0, size);
1373 memcpy(val, xi->name, name_len);
1374 xv = (struct ocfs2_xattr_value_root *)
1375 (val + OCFS2_XATTR_SIZE(name_len));
1376 xv->xr_clusters = 0;
1377 xv->xr_last_eb_blk = 0;
1378 xv->xr_list.l_tree_depth = 0;
1379 xv->xr_list.l_count = cpu_to_le16(1);
1380 xv->xr_list.l_next_free_rec = 0;
1381 vb->vb_xv = xv;
1382
1383 ret = ocfs2_xattr_value_truncate(inode, vb, xi->value_len, ctxt);
1384 if (ret < 0) {
1385 mlog_errno(ret);
1386 return ret;
1387 }
1388 ret = ocfs2_xattr_update_entry(inode, ctxt->handle, xi, xs, vb, offs);
1389 if (ret < 0) {
1390 mlog_errno(ret);
1391 return ret;
1392 }
1393 ret = __ocfs2_xattr_set_value_outside(inode, ctxt->handle, vb,
1394 xi->value, xi->value_len);
1395 if (ret < 0)
1396 mlog_errno(ret);
1397
1398 return ret;
1399 }
1400
1401 /*
1402 * ocfs2_xattr_set_entry_local()
1403 *
1404 * Set, replace or remove extended attribute in local.
1405 */
1406 static void ocfs2_xattr_set_entry_local(struct inode *inode,
1407 struct ocfs2_xattr_info *xi,
1408 struct ocfs2_xattr_search *xs,
1409 struct ocfs2_xattr_entry *last,
1410 size_t min_offs)
1411 {
1412 size_t name_len = strlen(xi->name);
1413 int i;
1414
1415 if (xi->value && xs->not_found) {
1416 /* Insert the new xattr entry. */
1417 le16_add_cpu(&xs->header->xh_count, 1);
1418 ocfs2_xattr_set_type(last, xi->name_index);
1419 ocfs2_xattr_set_local(last, 1);
1420 last->xe_name_len = name_len;
1421 } else {
1422 void *first_val;
1423 void *val;
1424 size_t offs, size;
1425
1426 first_val = xs->base + min_offs;
1427 offs = le16_to_cpu(xs->here->xe_name_offset);
1428 val = xs->base + offs;
1429
1430 if (le64_to_cpu(xs->here->xe_value_size) >
1431 OCFS2_XATTR_INLINE_SIZE)
1432 size = OCFS2_XATTR_SIZE(name_len) +
1433 OCFS2_XATTR_ROOT_SIZE;
1434 else
1435 size = OCFS2_XATTR_SIZE(name_len) +
1436 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1437
1438 if (xi->value && size == OCFS2_XATTR_SIZE(name_len) +
1439 OCFS2_XATTR_SIZE(xi->value_len)) {
1440 /* The old and the new value have the
1441 same size. Just replace the value. */
1442 ocfs2_xattr_set_local(xs->here, 1);
1443 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1444 /* Clear value bytes. */
1445 memset(val + OCFS2_XATTR_SIZE(name_len),
1446 0,
1447 OCFS2_XATTR_SIZE(xi->value_len));
1448 memcpy(val + OCFS2_XATTR_SIZE(name_len),
1449 xi->value,
1450 xi->value_len);
1451 return;
1452 }
1453 /* Remove the old name+value. */
1454 memmove(first_val + size, first_val, val - first_val);
1455 memset(first_val, 0, size);
1456 xs->here->xe_name_hash = 0;
1457 xs->here->xe_name_offset = 0;
1458 ocfs2_xattr_set_local(xs->here, 1);
1459 xs->here->xe_value_size = 0;
1460
1461 min_offs += size;
1462
1463 /* Adjust all value offsets. */
1464 last = xs->header->xh_entries;
1465 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1466 size_t o = le16_to_cpu(last->xe_name_offset);
1467
1468 if (o < offs)
1469 last->xe_name_offset = cpu_to_le16(o + size);
1470 last += 1;
1471 }
1472
1473 if (!xi->value) {
1474 /* Remove the old entry. */
1475 last -= 1;
1476 memmove(xs->here, xs->here + 1,
1477 (void *)last - (void *)xs->here);
1478 memset(last, 0, sizeof(struct ocfs2_xattr_entry));
1479 le16_add_cpu(&xs->header->xh_count, -1);
1480 }
1481 }
1482 if (xi->value) {
1483 /* Insert the new name+value. */
1484 size_t size = OCFS2_XATTR_SIZE(name_len) +
1485 OCFS2_XATTR_SIZE(xi->value_len);
1486 void *val = xs->base + min_offs - size;
1487
1488 xs->here->xe_name_offset = cpu_to_le16(min_offs - size);
1489 memset(val, 0, size);
1490 memcpy(val, xi->name, name_len);
1491 memcpy(val + OCFS2_XATTR_SIZE(name_len),
1492 xi->value,
1493 xi->value_len);
1494 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1495 ocfs2_xattr_set_local(xs->here, 1);
1496 ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1497 }
1498
1499 return;
1500 }
1501
1502 /*
1503 * ocfs2_xattr_set_entry()
1504 *
1505 * Set extended attribute entry into inode or block.
1506 *
1507 * If extended attribute value size > OCFS2_XATTR_INLINE_SIZE,
1508 * We first insert tree root(ocfs2_xattr_value_root) with set_entry_local(),
1509 * then set value in B tree with set_value_outside().
1510 */
1511 static int ocfs2_xattr_set_entry(struct inode *inode,
1512 struct ocfs2_xattr_info *xi,
1513 struct ocfs2_xattr_search *xs,
1514 struct ocfs2_xattr_set_ctxt *ctxt,
1515 int flag)
1516 {
1517 struct ocfs2_xattr_entry *last;
1518 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1519 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1520 size_t min_offs = xs->end - xs->base, name_len = strlen(xi->name);
1521 size_t size_l = 0;
1522 handle_t *handle = ctxt->handle;
1523 int free, i, ret;
1524 struct ocfs2_xattr_info xi_l = {
1525 .name_index = xi->name_index,
1526 .name = xi->name,
1527 .value = xi->value,
1528 .value_len = xi->value_len,
1529 };
1530 struct ocfs2_xattr_value_buf vb = {
1531 .vb_bh = xs->xattr_bh,
1532 .vb_access = ocfs2_journal_access_di,
1533 };
1534
1535 if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1536 BUG_ON(xs->xattr_bh == xs->inode_bh);
1537 vb.vb_access = ocfs2_journal_access_xb;
1538 } else
1539 BUG_ON(xs->xattr_bh != xs->inode_bh);
1540
1541 /* Compute min_offs, last and free space. */
1542 last = xs->header->xh_entries;
1543
1544 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1545 size_t offs = le16_to_cpu(last->xe_name_offset);
1546 if (offs < min_offs)
1547 min_offs = offs;
1548 last += 1;
1549 }
1550
1551 free = min_offs - ((void *)last - xs->base) - OCFS2_XATTR_HEADER_GAP;
1552 if (free < 0)
1553 return -EIO;
1554
1555 if (!xs->not_found) {
1556 size_t size = 0;
1557 if (ocfs2_xattr_is_local(xs->here))
1558 size = OCFS2_XATTR_SIZE(name_len) +
1559 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1560 else
1561 size = OCFS2_XATTR_SIZE(name_len) +
1562 OCFS2_XATTR_ROOT_SIZE;
1563 free += (size + sizeof(struct ocfs2_xattr_entry));
1564 }
1565 /* Check free space in inode or block */
1566 if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1567 if (free < sizeof(struct ocfs2_xattr_entry) +
1568 OCFS2_XATTR_SIZE(name_len) +
1569 OCFS2_XATTR_ROOT_SIZE) {
1570 ret = -ENOSPC;
1571 goto out;
1572 }
1573 size_l = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1574 xi_l.value = (void *)&def_xv;
1575 xi_l.value_len = OCFS2_XATTR_ROOT_SIZE;
1576 } else if (xi->value) {
1577 if (free < sizeof(struct ocfs2_xattr_entry) +
1578 OCFS2_XATTR_SIZE(name_len) +
1579 OCFS2_XATTR_SIZE(xi->value_len)) {
1580 ret = -ENOSPC;
1581 goto out;
1582 }
1583 }
1584
1585 if (!xs->not_found) {
1586 /* For existing extended attribute */
1587 size_t size = OCFS2_XATTR_SIZE(name_len) +
1588 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1589 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1590 void *val = xs->base + offs;
1591
1592 if (ocfs2_xattr_is_local(xs->here) && size == size_l) {
1593 /* Replace existing local xattr with tree root */
1594 ret = ocfs2_xattr_set_value_outside(inode, xi, xs,
1595 ctxt, &vb, offs);
1596 if (ret < 0)
1597 mlog_errno(ret);
1598 goto out;
1599 } else if (!ocfs2_xattr_is_local(xs->here)) {
1600 /* For existing xattr which has value outside */
1601 vb.vb_xv = (struct ocfs2_xattr_value_root *)
1602 (val + OCFS2_XATTR_SIZE(name_len));
1603
1604 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1605 /*
1606 * If new value need set outside also,
1607 * first truncate old value to new value,
1608 * then set new value with set_value_outside().
1609 */
1610 ret = ocfs2_xattr_value_truncate(inode,
1611 &vb,
1612 xi->value_len,
1613 ctxt);
1614 if (ret < 0) {
1615 mlog_errno(ret);
1616 goto out;
1617 }
1618
1619 ret = ocfs2_xattr_update_entry(inode,
1620 handle,
1621 xi,
1622 xs,
1623 &vb,
1624 offs);
1625 if (ret < 0) {
1626 mlog_errno(ret);
1627 goto out;
1628 }
1629
1630 ret = __ocfs2_xattr_set_value_outside(inode,
1631 handle,
1632 &vb,
1633 xi->value,
1634 xi->value_len);
1635 if (ret < 0)
1636 mlog_errno(ret);
1637 goto out;
1638 } else {
1639 /*
1640 * If new value need set in local,
1641 * just trucate old value to zero.
1642 */
1643 ret = ocfs2_xattr_value_truncate(inode,
1644 &vb,
1645 0,
1646 ctxt);
1647 if (ret < 0)
1648 mlog_errno(ret);
1649 }
1650 }
1651 }
1652
1653 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), xs->inode_bh,
1654 OCFS2_JOURNAL_ACCESS_WRITE);
1655 if (ret) {
1656 mlog_errno(ret);
1657 goto out;
1658 }
1659
1660 if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1661 ret = vb.vb_access(handle, INODE_CACHE(inode), vb.vb_bh,
1662 OCFS2_JOURNAL_ACCESS_WRITE);
1663 if (ret) {
1664 mlog_errno(ret);
1665 goto out;
1666 }
1667 }
1668
1669 /*
1670 * Set value in local, include set tree root in local.
1671 * This is the first step for value size >INLINE_SIZE.
1672 */
1673 ocfs2_xattr_set_entry_local(inode, &xi_l, xs, last, min_offs);
1674
1675 if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1676 ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
1677 if (ret < 0) {
1678 mlog_errno(ret);
1679 goto out;
1680 }
1681 }
1682
1683 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) &&
1684 (flag & OCFS2_INLINE_XATTR_FL)) {
1685 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1686 unsigned int xattrsize = osb->s_xattr_inline_size;
1687
1688 /*
1689 * Adjust extent record count or inline data size
1690 * to reserve space for extended attribute.
1691 */
1692 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1693 struct ocfs2_inline_data *idata = &di->id2.i_data;
1694 le16_add_cpu(&idata->id_count, -xattrsize);
1695 } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
1696 struct ocfs2_extent_list *el = &di->id2.i_list;
1697 le16_add_cpu(&el->l_count, -(xattrsize /
1698 sizeof(struct ocfs2_extent_rec)));
1699 }
1700 di->i_xattr_inline_size = cpu_to_le16(xattrsize);
1701 }
1702 /* Update xattr flag */
1703 spin_lock(&oi->ip_lock);
1704 oi->ip_dyn_features |= flag;
1705 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1706 spin_unlock(&oi->ip_lock);
1707
1708 ret = ocfs2_journal_dirty(handle, xs->inode_bh);
1709 if (ret < 0)
1710 mlog_errno(ret);
1711
1712 if (!ret && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1713 /*
1714 * Set value outside in B tree.
1715 * This is the second step for value size > INLINE_SIZE.
1716 */
1717 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1718 ret = ocfs2_xattr_set_value_outside(inode, xi, xs, ctxt,
1719 &vb, offs);
1720 if (ret < 0) {
1721 int ret2;
1722
1723 mlog_errno(ret);
1724 /*
1725 * If set value outside failed, we have to clean
1726 * the junk tree root we have already set in local.
1727 */
1728 ret2 = ocfs2_xattr_cleanup(inode, ctxt->handle,
1729 xi, xs, &vb, offs);
1730 if (ret2 < 0)
1731 mlog_errno(ret2);
1732 }
1733 }
1734 out:
1735 return ret;
1736 }
1737
1738 static int ocfs2_remove_value_outside(struct inode*inode,
1739 struct ocfs2_xattr_value_buf *vb,
1740 struct ocfs2_xattr_header *header)
1741 {
1742 int ret = 0, i;
1743 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1744 struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
1745
1746 ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
1747
1748 ctxt.handle = ocfs2_start_trans(osb,
1749 ocfs2_remove_extent_credits(osb->sb));
1750 if (IS_ERR(ctxt.handle)) {
1751 ret = PTR_ERR(ctxt.handle);
1752 mlog_errno(ret);
1753 goto out;
1754 }
1755
1756 for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
1757 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
1758
1759 if (!ocfs2_xattr_is_local(entry)) {
1760 void *val;
1761
1762 val = (void *)header +
1763 le16_to_cpu(entry->xe_name_offset);
1764 vb->vb_xv = (struct ocfs2_xattr_value_root *)
1765 (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
1766 ret = ocfs2_xattr_value_truncate(inode, vb, 0, &ctxt);
1767 if (ret < 0) {
1768 mlog_errno(ret);
1769 break;
1770 }
1771 }
1772 }
1773
1774 ocfs2_commit_trans(osb, ctxt.handle);
1775 ocfs2_schedule_truncate_log_flush(osb, 1);
1776 ocfs2_run_deallocs(osb, &ctxt.dealloc);
1777 out:
1778 return ret;
1779 }
1780
1781 static int ocfs2_xattr_ibody_remove(struct inode *inode,
1782 struct buffer_head *di_bh)
1783 {
1784
1785 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1786 struct ocfs2_xattr_header *header;
1787 int ret;
1788 struct ocfs2_xattr_value_buf vb = {
1789 .vb_bh = di_bh,
1790 .vb_access = ocfs2_journal_access_di,
1791 };
1792
1793 header = (struct ocfs2_xattr_header *)
1794 ((void *)di + inode->i_sb->s_blocksize -
1795 le16_to_cpu(di->i_xattr_inline_size));
1796
1797 ret = ocfs2_remove_value_outside(inode, &vb, header);
1798
1799 return ret;
1800 }
1801
1802 static int ocfs2_xattr_block_remove(struct inode *inode,
1803 struct buffer_head *blk_bh)
1804 {
1805 struct ocfs2_xattr_block *xb;
1806 int ret = 0;
1807 struct ocfs2_xattr_value_buf vb = {
1808 .vb_bh = blk_bh,
1809 .vb_access = ocfs2_journal_access_xb,
1810 };
1811
1812 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1813 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
1814 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
1815 ret = ocfs2_remove_value_outside(inode, &vb, header);
1816 } else
1817 ret = ocfs2_iterate_xattr_index_block(inode,
1818 blk_bh,
1819 ocfs2_rm_xattr_cluster,
1820 NULL);
1821
1822 return ret;
1823 }
1824
1825 static int ocfs2_xattr_free_block(struct inode *inode,
1826 u64 block)
1827 {
1828 struct inode *xb_alloc_inode;
1829 struct buffer_head *xb_alloc_bh = NULL;
1830 struct buffer_head *blk_bh = NULL;
1831 struct ocfs2_xattr_block *xb;
1832 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1833 handle_t *handle;
1834 int ret = 0;
1835 u64 blk, bg_blkno;
1836 u16 bit;
1837
1838 ret = ocfs2_read_xattr_block(inode, block, &blk_bh);
1839 if (ret < 0) {
1840 mlog_errno(ret);
1841 goto out;
1842 }
1843
1844 ret = ocfs2_xattr_block_remove(inode, blk_bh);
1845 if (ret < 0) {
1846 mlog_errno(ret);
1847 goto out;
1848 }
1849
1850 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1851 blk = le64_to_cpu(xb->xb_blkno);
1852 bit = le16_to_cpu(xb->xb_suballoc_bit);
1853 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
1854
1855 xb_alloc_inode = ocfs2_get_system_file_inode(osb,
1856 EXTENT_ALLOC_SYSTEM_INODE,
1857 le16_to_cpu(xb->xb_suballoc_slot));
1858 if (!xb_alloc_inode) {
1859 ret = -ENOMEM;
1860 mlog_errno(ret);
1861 goto out;
1862 }
1863 mutex_lock(&xb_alloc_inode->i_mutex);
1864
1865 ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
1866 if (ret < 0) {
1867 mlog_errno(ret);
1868 goto out_mutex;
1869 }
1870
1871 handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
1872 if (IS_ERR(handle)) {
1873 ret = PTR_ERR(handle);
1874 mlog_errno(ret);
1875 goto out_unlock;
1876 }
1877
1878 ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
1879 bit, bg_blkno, 1);
1880 if (ret < 0)
1881 mlog_errno(ret);
1882
1883 ocfs2_commit_trans(osb, handle);
1884 out_unlock:
1885 ocfs2_inode_unlock(xb_alloc_inode, 1);
1886 brelse(xb_alloc_bh);
1887 out_mutex:
1888 mutex_unlock(&xb_alloc_inode->i_mutex);
1889 iput(xb_alloc_inode);
1890 out:
1891 brelse(blk_bh);
1892 return ret;
1893 }
1894
1895 /*
1896 * ocfs2_xattr_remove()
1897 *
1898 * Free extended attribute resources associated with this inode.
1899 */
1900 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
1901 {
1902 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1903 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1904 handle_t *handle;
1905 int ret;
1906
1907 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1908 return 0;
1909
1910 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1911 return 0;
1912
1913 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
1914 ret = ocfs2_xattr_ibody_remove(inode, di_bh);
1915 if (ret < 0) {
1916 mlog_errno(ret);
1917 goto out;
1918 }
1919 }
1920
1921 if (di->i_xattr_loc) {
1922 ret = ocfs2_xattr_free_block(inode,
1923 le64_to_cpu(di->i_xattr_loc));
1924 if (ret < 0) {
1925 mlog_errno(ret);
1926 goto out;
1927 }
1928 }
1929
1930 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1931 OCFS2_INODE_UPDATE_CREDITS);
1932 if (IS_ERR(handle)) {
1933 ret = PTR_ERR(handle);
1934 mlog_errno(ret);
1935 goto out;
1936 }
1937 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
1938 OCFS2_JOURNAL_ACCESS_WRITE);
1939 if (ret) {
1940 mlog_errno(ret);
1941 goto out_commit;
1942 }
1943
1944 di->i_xattr_loc = 0;
1945
1946 spin_lock(&oi->ip_lock);
1947 oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
1948 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1949 spin_unlock(&oi->ip_lock);
1950
1951 ret = ocfs2_journal_dirty(handle, di_bh);
1952 if (ret < 0)
1953 mlog_errno(ret);
1954 out_commit:
1955 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1956 out:
1957 return ret;
1958 }
1959
1960 static int ocfs2_xattr_has_space_inline(struct inode *inode,
1961 struct ocfs2_dinode *di)
1962 {
1963 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1964 unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
1965 int free;
1966
1967 if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
1968 return 0;
1969
1970 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1971 struct ocfs2_inline_data *idata = &di->id2.i_data;
1972 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
1973 } else if (ocfs2_inode_is_fast_symlink(inode)) {
1974 free = ocfs2_fast_symlink_chars(inode->i_sb) -
1975 le64_to_cpu(di->i_size);
1976 } else {
1977 struct ocfs2_extent_list *el = &di->id2.i_list;
1978 free = (le16_to_cpu(el->l_count) -
1979 le16_to_cpu(el->l_next_free_rec)) *
1980 sizeof(struct ocfs2_extent_rec);
1981 }
1982 if (free >= xattrsize)
1983 return 1;
1984
1985 return 0;
1986 }
1987
1988 /*
1989 * ocfs2_xattr_ibody_find()
1990 *
1991 * Find extended attribute in inode block and
1992 * fill search info into struct ocfs2_xattr_search.
1993 */
1994 static int ocfs2_xattr_ibody_find(struct inode *inode,
1995 int name_index,
1996 const char *name,
1997 struct ocfs2_xattr_search *xs)
1998 {
1999 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2000 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2001 int ret;
2002 int has_space = 0;
2003
2004 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2005 return 0;
2006
2007 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2008 down_read(&oi->ip_alloc_sem);
2009 has_space = ocfs2_xattr_has_space_inline(inode, di);
2010 up_read(&oi->ip_alloc_sem);
2011 if (!has_space)
2012 return 0;
2013 }
2014
2015 xs->xattr_bh = xs->inode_bh;
2016 xs->end = (void *)di + inode->i_sb->s_blocksize;
2017 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
2018 xs->header = (struct ocfs2_xattr_header *)
2019 (xs->end - le16_to_cpu(di->i_xattr_inline_size));
2020 else
2021 xs->header = (struct ocfs2_xattr_header *)
2022 (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
2023 xs->base = (void *)xs->header;
2024 xs->here = xs->header->xh_entries;
2025
2026 /* Find the named attribute. */
2027 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2028 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2029 if (ret && ret != -ENODATA)
2030 return ret;
2031 xs->not_found = ret;
2032 }
2033
2034 return 0;
2035 }
2036
2037 /*
2038 * ocfs2_xattr_ibody_set()
2039 *
2040 * Set, replace or remove an extended attribute into inode block.
2041 *
2042 */
2043 static int ocfs2_xattr_ibody_set(struct inode *inode,
2044 struct ocfs2_xattr_info *xi,
2045 struct ocfs2_xattr_search *xs,
2046 struct ocfs2_xattr_set_ctxt *ctxt)
2047 {
2048 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2049 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2050 int ret;
2051
2052 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2053 return -ENOSPC;
2054
2055 down_write(&oi->ip_alloc_sem);
2056 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2057 if (!ocfs2_xattr_has_space_inline(inode, di)) {
2058 ret = -ENOSPC;
2059 goto out;
2060 }
2061 }
2062
2063 ret = ocfs2_xattr_set_entry(inode, xi, xs, ctxt,
2064 (OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL));
2065 out:
2066 up_write(&oi->ip_alloc_sem);
2067
2068 return ret;
2069 }
2070
2071 /*
2072 * ocfs2_xattr_block_find()
2073 *
2074 * Find extended attribute in external block and
2075 * fill search info into struct ocfs2_xattr_search.
2076 */
2077 static int ocfs2_xattr_block_find(struct inode *inode,
2078 int name_index,
2079 const char *name,
2080 struct ocfs2_xattr_search *xs)
2081 {
2082 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2083 struct buffer_head *blk_bh = NULL;
2084 struct ocfs2_xattr_block *xb;
2085 int ret = 0;
2086
2087 if (!di->i_xattr_loc)
2088 return ret;
2089
2090 ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
2091 &blk_bh);
2092 if (ret < 0) {
2093 mlog_errno(ret);
2094 return ret;
2095 }
2096
2097 xs->xattr_bh = blk_bh;
2098 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2099
2100 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2101 xs->header = &xb->xb_attrs.xb_header;
2102 xs->base = (void *)xs->header;
2103 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
2104 xs->here = xs->header->xh_entries;
2105
2106 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2107 } else
2108 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
2109 name_index,
2110 name, xs);
2111
2112 if (ret && ret != -ENODATA) {
2113 xs->xattr_bh = NULL;
2114 goto cleanup;
2115 }
2116 xs->not_found = ret;
2117 return 0;
2118 cleanup:
2119 brelse(blk_bh);
2120
2121 return ret;
2122 }
2123
2124 static int ocfs2_create_xattr_block(handle_t *handle,
2125 struct inode *inode,
2126 struct buffer_head *inode_bh,
2127 struct ocfs2_alloc_context *meta_ac,
2128 struct buffer_head **ret_bh)
2129 {
2130 int ret;
2131 u16 suballoc_bit_start;
2132 u32 num_got;
2133 u64 first_blkno;
2134 struct ocfs2_dinode *di = (struct ocfs2_dinode *)inode_bh->b_data;
2135 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2136 struct buffer_head *new_bh = NULL;
2137 struct ocfs2_xattr_block *xblk;
2138
2139 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), inode_bh,
2140 OCFS2_JOURNAL_ACCESS_CREATE);
2141 if (ret < 0) {
2142 mlog_errno(ret);
2143 goto end;
2144 }
2145
2146 ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1,
2147 &suballoc_bit_start, &num_got,
2148 &first_blkno);
2149 if (ret < 0) {
2150 mlog_errno(ret);
2151 goto end;
2152 }
2153
2154 new_bh = sb_getblk(inode->i_sb, first_blkno);
2155 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), new_bh);
2156
2157 ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode),
2158 new_bh,
2159 OCFS2_JOURNAL_ACCESS_CREATE);
2160 if (ret < 0) {
2161 mlog_errno(ret);
2162 goto end;
2163 }
2164
2165 /* Initialize ocfs2_xattr_block */
2166 xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
2167 memset(xblk, 0, inode->i_sb->s_blocksize);
2168 strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
2169 xblk->xb_suballoc_slot = cpu_to_le16(osb->slot_num);
2170 xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
2171 xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation);
2172 xblk->xb_blkno = cpu_to_le64(first_blkno);
2173
2174 ret = ocfs2_journal_dirty(handle, new_bh);
2175 if (ret < 0) {
2176 mlog_errno(ret);
2177 goto end;
2178 }
2179 di->i_xattr_loc = cpu_to_le64(first_blkno);
2180 ocfs2_journal_dirty(handle, inode_bh);
2181
2182 *ret_bh = new_bh;
2183 new_bh = NULL;
2184
2185 end:
2186 brelse(new_bh);
2187 return ret;
2188 }
2189
2190 /*
2191 * ocfs2_xattr_block_set()
2192 *
2193 * Set, replace or remove an extended attribute into external block.
2194 *
2195 */
2196 static int ocfs2_xattr_block_set(struct inode *inode,
2197 struct ocfs2_xattr_info *xi,
2198 struct ocfs2_xattr_search *xs,
2199 struct ocfs2_xattr_set_ctxt *ctxt)
2200 {
2201 struct buffer_head *new_bh = NULL;
2202 handle_t *handle = ctxt->handle;
2203 struct ocfs2_xattr_block *xblk = NULL;
2204 int ret;
2205
2206 if (!xs->xattr_bh) {
2207 ret = ocfs2_create_xattr_block(handle, inode, xs->inode_bh,
2208 ctxt->meta_ac, &new_bh);
2209 if (ret) {
2210 mlog_errno(ret);
2211 goto end;
2212 }
2213
2214 xs->xattr_bh = new_bh;
2215 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2216 xs->header = &xblk->xb_attrs.xb_header;
2217 xs->base = (void *)xs->header;
2218 xs->end = (void *)xblk + inode->i_sb->s_blocksize;
2219 xs->here = xs->header->xh_entries;
2220 } else
2221 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2222
2223 if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
2224 /* Set extended attribute into external block */
2225 ret = ocfs2_xattr_set_entry(inode, xi, xs, ctxt,
2226 OCFS2_HAS_XATTR_FL);
2227 if (!ret || ret != -ENOSPC)
2228 goto end;
2229
2230 ret = ocfs2_xattr_create_index_block(inode, xs, ctxt);
2231 if (ret)
2232 goto end;
2233 }
2234
2235 ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs, ctxt);
2236
2237 end:
2238
2239 return ret;
2240 }
2241
2242 /* Check whether the new xattr can be inserted into the inode. */
2243 static int ocfs2_xattr_can_be_in_inode(struct inode *inode,
2244 struct ocfs2_xattr_info *xi,
2245 struct ocfs2_xattr_search *xs)
2246 {
2247 u64 value_size;
2248 struct ocfs2_xattr_entry *last;
2249 int free, i;
2250 size_t min_offs = xs->end - xs->base;
2251
2252 if (!xs->header)
2253 return 0;
2254
2255 last = xs->header->xh_entries;
2256
2257 for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
2258 size_t offs = le16_to_cpu(last->xe_name_offset);
2259 if (offs < min_offs)
2260 min_offs = offs;
2261 last += 1;
2262 }
2263
2264 free = min_offs - ((void *)last - xs->base) - OCFS2_XATTR_HEADER_GAP;
2265 if (free < 0)
2266 return 0;
2267
2268 BUG_ON(!xs->not_found);
2269
2270 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
2271 value_size = OCFS2_XATTR_ROOT_SIZE;
2272 else
2273 value_size = OCFS2_XATTR_SIZE(xi->value_len);
2274
2275 if (free >= sizeof(struct ocfs2_xattr_entry) +
2276 OCFS2_XATTR_SIZE(strlen(xi->name)) + value_size)
2277 return 1;
2278
2279 return 0;
2280 }
2281
2282 static int ocfs2_calc_xattr_set_need(struct inode *inode,
2283 struct ocfs2_dinode *di,
2284 struct ocfs2_xattr_info *xi,
2285 struct ocfs2_xattr_search *xis,
2286 struct ocfs2_xattr_search *xbs,
2287 int *clusters_need,
2288 int *meta_need,
2289 int *credits_need)
2290 {
2291 int ret = 0, old_in_xb = 0;
2292 int clusters_add = 0, meta_add = 0, credits = 0;
2293 struct buffer_head *bh = NULL;
2294 struct ocfs2_xattr_block *xb = NULL;
2295 struct ocfs2_xattr_entry *xe = NULL;
2296 struct ocfs2_xattr_value_root *xv = NULL;
2297 char *base = NULL;
2298 int name_offset, name_len = 0;
2299 u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
2300 xi->value_len);
2301 u64 value_size;
2302
2303 /*
2304 * Calculate the clusters we need to write.
2305 * No matter whether we replace an old one or add a new one,
2306 * we need this for writing.
2307 */
2308 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
2309 credits += new_clusters *
2310 ocfs2_clusters_to_blocks(inode->i_sb, 1);
2311
2312 if (xis->not_found && xbs->not_found) {
2313 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2314
2315 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
2316 clusters_add += new_clusters;
2317 credits += ocfs2_calc_extend_credits(inode->i_sb,
2318 &def_xv.xv.xr_list,
2319 new_clusters);
2320 }
2321
2322 goto meta_guess;
2323 }
2324
2325 if (!xis->not_found) {
2326 xe = xis->here;
2327 name_offset = le16_to_cpu(xe->xe_name_offset);
2328 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
2329 base = xis->base;
2330 credits += OCFS2_INODE_UPDATE_CREDITS;
2331 } else {
2332 int i, block_off = 0;
2333 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
2334 xe = xbs->here;
2335 name_offset = le16_to_cpu(xe->xe_name_offset);
2336 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
2337 i = xbs->here - xbs->header->xh_entries;
2338 old_in_xb = 1;
2339
2340 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
2341 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
2342 bucket_xh(xbs->bucket),
2343 i, &block_off,
2344 &name_offset);
2345 base = bucket_block(xbs->bucket, block_off);
2346 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2347 } else {
2348 base = xbs->base;
2349 credits += OCFS2_XATTR_BLOCK_UPDATE_CREDITS;
2350 }
2351 }
2352
2353 /*
2354 * delete a xattr doesn't need metadata and cluster allocation.
2355 * so just calculate the credits and return.
2356 *
2357 * The credits for removing the value tree will be extended
2358 * by ocfs2_remove_extent itself.
2359 */
2360 if (!xi->value) {
2361 if (!ocfs2_xattr_is_local(xe))
2362 credits += ocfs2_remove_extent_credits(inode->i_sb);
2363
2364 goto out;
2365 }
2366
2367 /* do cluster allocation guess first. */
2368 value_size = le64_to_cpu(xe->xe_value_size);
2369
2370 if (old_in_xb) {
2371 /*
2372 * In xattr set, we always try to set the xe in inode first,
2373 * so if it can be inserted into inode successfully, the old
2374 * one will be removed from the xattr block, and this xattr
2375 * will be inserted into inode as a new xattr in inode.
2376 */
2377 if (ocfs2_xattr_can_be_in_inode(inode, xi, xis)) {
2378 clusters_add += new_clusters;
2379 credits += ocfs2_remove_extent_credits(inode->i_sb) +
2380 OCFS2_INODE_UPDATE_CREDITS;
2381 if (!ocfs2_xattr_is_local(xe))
2382 credits += ocfs2_calc_extend_credits(
2383 inode->i_sb,
2384 &def_xv.xv.xr_list,
2385 new_clusters);
2386 goto out;
2387 }
2388 }
2389
2390 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
2391 /* the new values will be stored outside. */
2392 u32 old_clusters = 0;
2393
2394 if (!ocfs2_xattr_is_local(xe)) {
2395 old_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
2396 value_size);
2397 xv = (struct ocfs2_xattr_value_root *)
2398 (base + name_offset + name_len);
2399 value_size = OCFS2_XATTR_ROOT_SIZE;
2400 } else
2401 xv = &def_xv.xv;
2402
2403 if (old_clusters >= new_clusters) {
2404 credits += ocfs2_remove_extent_credits(inode->i_sb);
2405 goto out;
2406 } else {
2407 meta_add += ocfs2_extend_meta_needed(&xv->xr_list);
2408 clusters_add += new_clusters - old_clusters;
2409 credits += ocfs2_calc_extend_credits(inode->i_sb,
2410 &xv->xr_list,
2411 new_clusters -
2412 old_clusters);
2413 if (value_size >= OCFS2_XATTR_ROOT_SIZE)
2414 goto out;
2415 }
2416 } else {
2417 /*
2418 * Now the new value will be stored inside. So if the new
2419 * value is smaller than the size of value root or the old
2420 * value, we don't need any allocation, otherwise we have
2421 * to guess metadata allocation.
2422 */
2423 if ((ocfs2_xattr_is_local(xe) && value_size >= xi->value_len) ||
2424 (!ocfs2_xattr_is_local(xe) &&
2425 OCFS2_XATTR_ROOT_SIZE >= xi->value_len))
2426 goto out;
2427 }
2428
2429 meta_guess:
2430 /* calculate metadata allocation. */
2431 if (di->i_xattr_loc) {
2432 if (!xbs->xattr_bh) {
2433 ret = ocfs2_read_xattr_block(inode,
2434 le64_to_cpu(di->i_xattr_loc),
2435 &bh);
2436 if (ret) {
2437 mlog_errno(ret);
2438 goto out;
2439 }
2440
2441 xb = (struct ocfs2_xattr_block *)bh->b_data;
2442 } else
2443 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
2444
2445 /*
2446 * If there is already an xattr tree, good, we can calculate
2447 * like other b-trees. Otherwise we may have the chance of
2448 * create a tree, the credit calculation is borrowed from
2449 * ocfs2_calc_extend_credits with root_el = NULL. And the
2450 * new tree will be cluster based, so no meta is needed.
2451 */
2452 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
2453 struct ocfs2_extent_list *el =
2454 &xb->xb_attrs.xb_root.xt_list;
2455 meta_add += ocfs2_extend_meta_needed(el);
2456 credits += ocfs2_calc_extend_credits(inode->i_sb,
2457 el, 1);
2458 } else
2459 credits += OCFS2_SUBALLOC_ALLOC + 1;
2460
2461 /*
2462 * This cluster will be used either for new bucket or for
2463 * new xattr block.
2464 * If the cluster size is the same as the bucket size, one
2465 * more is needed since we may need to extend the bucket
2466 * also.
2467 */
2468 clusters_add += 1;
2469 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2470 if (OCFS2_XATTR_BUCKET_SIZE ==
2471 OCFS2_SB(inode->i_sb)->s_clustersize) {
2472 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2473 clusters_add += 1;
2474 }
2475 } else {
2476 meta_add += 1;
2477 credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
2478 }
2479 out:
2480 if (clusters_need)
2481 *clusters_need = clusters_add;
2482 if (meta_need)
2483 *meta_need = meta_add;
2484 if (credits_need)
2485 *credits_need = credits;
2486 brelse(bh);
2487 return ret;
2488 }
2489
2490 static int ocfs2_init_xattr_set_ctxt(struct inode *inode,
2491 struct ocfs2_dinode *di,
2492 struct ocfs2_xattr_info *xi,
2493 struct ocfs2_xattr_search *xis,
2494 struct ocfs2_xattr_search *xbs,
2495 struct ocfs2_xattr_set_ctxt *ctxt,
2496 int extra_meta,
2497 int *credits)
2498 {
2499 int clusters_add, meta_add, ret;
2500 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2501
2502 memset(ctxt, 0, sizeof(struct ocfs2_xattr_set_ctxt));
2503
2504 ocfs2_init_dealloc_ctxt(&ctxt->dealloc);
2505
2506 ret = ocfs2_calc_xattr_set_need(inode, di, xi, xis, xbs,
2507 &clusters_add, &meta_add, credits);
2508 if (ret) {
2509 mlog_errno(ret);
2510 return ret;
2511 }
2512
2513 meta_add += extra_meta;
2514 mlog(0, "Set xattr %s, reserve meta blocks = %d, clusters = %d, "
2515 "credits = %d\n", xi->name, meta_add, clusters_add, *credits);
2516
2517 if (meta_add) {
2518 ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add,
2519 &ctxt->meta_ac);
2520 if (ret) {
2521 mlog_errno(ret);
2522 goto out;
2523 }
2524 }
2525
2526 if (clusters_add) {
2527 ret = ocfs2_reserve_clusters(osb, clusters_add, &ctxt->data_ac);
2528 if (ret)
2529 mlog_errno(ret);
2530 }
2531 out:
2532 if (ret) {
2533 if (ctxt->meta_ac) {
2534 ocfs2_free_alloc_context(ctxt->meta_ac);
2535 ctxt->meta_ac = NULL;
2536 }
2537
2538 /*
2539 * We cannot have an error and a non null ctxt->data_ac.
2540 */
2541 }
2542
2543 return ret;
2544 }
2545
2546 static int __ocfs2_xattr_set_handle(struct inode *inode,
2547 struct ocfs2_dinode *di,
2548 struct ocfs2_xattr_info *xi,
2549 struct ocfs2_xattr_search *xis,
2550 struct ocfs2_xattr_search *xbs,
2551 struct ocfs2_xattr_set_ctxt *ctxt)
2552 {
2553 int ret = 0, credits, old_found;
2554
2555 if (!xi->value) {
2556 /* Remove existing extended attribute */
2557 if (!xis->not_found)
2558 ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
2559 else if (!xbs->not_found)
2560 ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
2561 } else {
2562 /* We always try to set extended attribute into inode first*/
2563 ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
2564 if (!ret && !xbs->not_found) {
2565 /*
2566 * If succeed and that extended attribute existing in
2567 * external block, then we will remove it.
2568 */
2569 xi->value = NULL;
2570 xi->value_len = 0;
2571
2572 old_found = xis->not_found;
2573 xis->not_found = -ENODATA;
2574 ret = ocfs2_calc_xattr_set_need(inode,
2575 di,
2576 xi,
2577 xis,
2578 xbs,
2579 NULL,
2580 NULL,
2581 &credits);
2582 xis->not_found = old_found;
2583 if (ret) {
2584 mlog_errno(ret);
2585 goto out;
2586 }
2587
2588 ret = ocfs2_extend_trans(ctxt->handle, credits +
2589 ctxt->handle->h_buffer_credits);
2590 if (ret) {
2591 mlog_errno(ret);
2592 goto out;
2593 }
2594 ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
2595 } else if (ret == -ENOSPC) {
2596 if (di->i_xattr_loc && !xbs->xattr_bh) {
2597 ret = ocfs2_xattr_block_find(inode,
2598 xi->name_index,
2599 xi->name, xbs);
2600 if (ret)
2601 goto out;
2602
2603 old_found = xis->not_found;
2604 xis->not_found = -ENODATA;
2605 ret = ocfs2_calc_xattr_set_need(inode,
2606 di,
2607 xi,
2608 xis,
2609 xbs,
2610 NULL,
2611 NULL,
2612 &credits);
2613 xis->not_found = old_found;
2614 if (ret) {
2615 mlog_errno(ret);
2616 goto out;
2617 }
2618
2619 ret = ocfs2_extend_trans(ctxt->handle, credits +
2620 ctxt->handle->h_buffer_credits);
2621 if (ret) {
2622 mlog_errno(ret);
2623 goto out;
2624 }
2625 }
2626 /*
2627 * If no space in inode, we will set extended attribute
2628 * into external block.
2629 */
2630 ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
2631 if (ret)
2632 goto out;
2633 if (!xis->not_found) {
2634 /*
2635 * If succeed and that extended attribute
2636 * existing in inode, we will remove it.
2637 */
2638 xi->value = NULL;
2639 xi->value_len = 0;
2640 xbs->not_found = -ENODATA;
2641 ret = ocfs2_calc_xattr_set_need(inode,
2642 di,
2643 xi,
2644 xis,
2645 xbs,
2646 NULL,
2647 NULL,
2648 &credits);
2649 if (ret) {
2650 mlog_errno(ret);
2651 goto out;
2652 }
2653
2654 ret = ocfs2_extend_trans(ctxt->handle, credits +
2655 ctxt->handle->h_buffer_credits);
2656 if (ret) {
2657 mlog_errno(ret);
2658 goto out;
2659 }
2660 ret = ocfs2_xattr_ibody_set(inode, xi,
2661 xis, ctxt);
2662 }
2663 }
2664 }
2665
2666 if (!ret) {
2667 /* Update inode ctime. */
2668 ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
2669 xis->inode_bh,
2670 OCFS2_JOURNAL_ACCESS_WRITE);
2671 if (ret) {
2672 mlog_errno(ret);
2673 goto out;
2674 }
2675
2676 inode->i_ctime = CURRENT_TIME;
2677 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
2678 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
2679 ocfs2_journal_dirty(ctxt->handle, xis->inode_bh);
2680 }
2681 out:
2682 return ret;
2683 }
2684
2685 /*
2686 * This function only called duing creating inode
2687 * for init security/acl xattrs of the new inode.
2688 * All transanction credits have been reserved in mknod.
2689 */
2690 int ocfs2_xattr_set_handle(handle_t *handle,
2691 struct inode *inode,
2692 struct buffer_head *di_bh,
2693 int name_index,
2694 const char *name,
2695 const void *value,
2696 size_t value_len,
2697 int flags,
2698 struct ocfs2_alloc_context *meta_ac,
2699 struct ocfs2_alloc_context *data_ac)
2700 {
2701 struct ocfs2_dinode *di;
2702 int ret;
2703
2704 struct ocfs2_xattr_info xi = {
2705 .name_index = name_index,
2706 .name = name,
2707 .value = value,
2708 .value_len = value_len,
2709 };
2710
2711 struct ocfs2_xattr_search xis = {
2712 .not_found = -ENODATA,
2713 };
2714
2715 struct ocfs2_xattr_search xbs = {
2716 .not_found = -ENODATA,
2717 };
2718
2719 struct ocfs2_xattr_set_ctxt ctxt = {
2720 .handle = handle,
2721 .meta_ac = meta_ac,
2722 .data_ac = data_ac,
2723 };
2724
2725 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2726 return -EOPNOTSUPP;
2727
2728 /*
2729 * In extreme situation, may need xattr bucket when
2730 * block size is too small. And we have already reserved
2731 * the credits for bucket in mknod.
2732 */
2733 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) {
2734 xbs.bucket = ocfs2_xattr_bucket_new(inode);
2735 if (!xbs.bucket) {
2736 mlog_errno(-ENOMEM);
2737 return -ENOMEM;
2738 }
2739 }
2740
2741 xis.inode_bh = xbs.inode_bh = di_bh;
2742 di = (struct ocfs2_dinode *)di_bh->b_data;
2743
2744 down_write(&OCFS2_I(inode)->ip_xattr_sem);
2745
2746 ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
2747 if (ret)
2748 goto cleanup;
2749 if (xis.not_found) {
2750 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
2751 if (ret)
2752 goto cleanup;
2753 }
2754
2755 ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
2756
2757 cleanup:
2758 up_write(&OCFS2_I(inode)->ip_xattr_sem);
2759 brelse(xbs.xattr_bh);
2760 ocfs2_xattr_bucket_free(xbs.bucket);
2761
2762 return ret;
2763 }
2764
2765 /*
2766 * ocfs2_xattr_set()
2767 *
2768 * Set, replace or remove an extended attribute for this inode.
2769 * value is NULL to remove an existing extended attribute, else either
2770 * create or replace an extended attribute.
2771 */
2772 int ocfs2_xattr_set(struct inode *inode,
2773 int name_index,
2774 const char *name,
2775 const void *value,
2776 size_t value_len,
2777 int flags)
2778 {
2779 struct buffer_head *di_bh = NULL;
2780 struct ocfs2_dinode *di;
2781 int ret, credits, ref_meta = 0, ref_credits = 0;
2782 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2783 struct inode *tl_inode = osb->osb_tl_inode;
2784 struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
2785 struct ocfs2_refcount_tree *ref_tree = NULL;
2786
2787 struct ocfs2_xattr_info xi = {
2788 .name_index = name_index,
2789 .name = name,
2790 .value = value,
2791 .value_len = value_len,
2792 };
2793
2794 struct ocfs2_xattr_search xis = {
2795 .not_found = -ENODATA,
2796 };
2797
2798 struct ocfs2_xattr_search xbs = {
2799 .not_found = -ENODATA,
2800 };
2801
2802 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2803 return -EOPNOTSUPP;
2804
2805 /*
2806 * Only xbs will be used on indexed trees. xis doesn't need a
2807 * bucket.
2808 */
2809 xbs.bucket = ocfs2_xattr_bucket_new(inode);
2810 if (!xbs.bucket) {
2811 mlog_errno(-ENOMEM);
2812 return -ENOMEM;
2813 }
2814
2815 ret = ocfs2_inode_lock(inode, &di_bh, 1);
2816 if (ret < 0) {
2817 mlog_errno(ret);
2818 goto cleanup_nolock;
2819 }
2820 xis.inode_bh = xbs.inode_bh = di_bh;
2821 di = (struct ocfs2_dinode *)di_bh->b_data;
2822
2823 down_write(&OCFS2_I(inode)->ip_xattr_sem);
2824 /*
2825 * Scan inode and external block to find the same name
2826 * extended attribute and collect search infomation.
2827 */
2828 ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
2829 if (ret)
2830 goto cleanup;
2831 if (xis.not_found) {
2832 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
2833 if (ret)
2834 goto cleanup;
2835 }
2836
2837 if (xis.not_found && xbs.not_found) {
2838 ret = -ENODATA;
2839 if (flags & XATTR_REPLACE)
2840 goto cleanup;
2841 ret = 0;
2842 if (!value)
2843 goto cleanup;
2844 } else {
2845 ret = -EEXIST;
2846 if (flags & XATTR_CREATE)
2847 goto cleanup;
2848 }
2849
2850 /* Check whether the value is refcounted and do some prepartion. */
2851 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL &&
2852 (!xis.not_found || !xbs.not_found)) {
2853 ret = ocfs2_prepare_refcount_xattr(inode, di, &xi,
2854 &xis, &xbs, &ref_tree,
2855 &ref_meta, &ref_credits);
2856 if (ret) {
2857 mlog_errno(ret);
2858 goto cleanup;
2859 }
2860 }
2861
2862 mutex_lock(&tl_inode->i_mutex);
2863
2864 if (ocfs2_truncate_log_needs_flush(osb)) {
2865 ret = __ocfs2_flush_truncate_log(osb);
2866 if (ret < 0) {
2867 mutex_unlock(&tl_inode->i_mutex);
2868 mlog_errno(ret);
2869 goto cleanup;
2870 }
2871 }
2872 mutex_unlock(&tl_inode->i_mutex);
2873
2874 ret = ocfs2_init_xattr_set_ctxt(inode, di, &xi, &xis,
2875 &xbs, &ctxt, ref_meta, &credits);
2876 if (ret) {
2877 mlog_errno(ret);
2878 goto cleanup;
2879 }
2880
2881 /* we need to update inode's ctime field, so add credit for it. */
2882 credits += OCFS2_INODE_UPDATE_CREDITS;
2883 ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
2884 if (IS_ERR(ctxt.handle)) {
2885 ret = PTR_ERR(ctxt.handle);
2886 mlog_errno(ret);
2887 goto cleanup;
2888 }
2889
2890 ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
2891
2892 ocfs2_commit_trans(osb, ctxt.handle);
2893
2894 if (ctxt.data_ac)
2895 ocfs2_free_alloc_context(ctxt.data_ac);
2896 if (ctxt.meta_ac)
2897 ocfs2_free_alloc_context(ctxt.meta_ac);
2898 if (ocfs2_dealloc_has_cluster(&ctxt.dealloc))
2899 ocfs2_schedule_truncate_log_flush(osb, 1);
2900 ocfs2_run_deallocs(osb, &ctxt.dealloc);
2901 cleanup:
2902 if (ref_tree)
2903 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
2904 up_write(&OCFS2_I(inode)->ip_xattr_sem);
2905 ocfs2_inode_unlock(inode, 1);
2906 cleanup_nolock:
2907 brelse(di_bh);
2908 brelse(xbs.xattr_bh);
2909 ocfs2_xattr_bucket_free(xbs.bucket);
2910
2911 return ret;
2912 }
2913
2914 /*
2915 * Find the xattr extent rec which may contains name_hash.
2916 * e_cpos will be the first name hash of the xattr rec.
2917 * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
2918 */
2919 static int ocfs2_xattr_get_rec(struct inode *inode,
2920 u32 name_hash,
2921 u64 *p_blkno,
2922 u32 *e_cpos,
2923 u32 *num_clusters,
2924 struct ocfs2_extent_list *el)
2925 {
2926 int ret = 0, i;
2927 struct buffer_head *eb_bh = NULL;
2928 struct ocfs2_extent_block *eb;
2929 struct ocfs2_extent_rec *rec = NULL;
2930 u64 e_blkno = 0;
2931
2932 if (el->l_tree_depth) {
2933 ret = ocfs2_find_leaf(INODE_CACHE(inode), el, name_hash,
2934 &eb_bh);
2935 if (ret) {
2936 mlog_errno(ret);
2937 goto out;
2938 }
2939
2940 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2941 el = &eb->h_list;
2942
2943 if (el->l_tree_depth) {
2944 ocfs2_error(inode->i_sb,
2945 "Inode %lu has non zero tree depth in "
2946 "xattr tree block %llu\n", inode->i_ino,
2947 (unsigned long long)eb_bh->b_blocknr);
2948 ret = -EROFS;
2949 goto out;
2950 }
2951 }
2952
2953 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
2954 rec = &el->l_recs[i];
2955
2956 if (le32_to_cpu(rec->e_cpos) <= name_hash) {
2957 e_blkno = le64_to_cpu(rec->e_blkno);
2958 break;
2959 }
2960 }
2961
2962 if (!e_blkno) {
2963 ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
2964 "record (%u, %u, 0) in xattr", inode->i_ino,
2965 le32_to_cpu(rec->e_cpos),
2966 ocfs2_rec_clusters(el, rec));
2967 ret = -EROFS;
2968 goto out;
2969 }
2970
2971 *p_blkno = le64_to_cpu(rec->e_blkno);
2972 *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
2973 if (e_cpos)
2974 *e_cpos = le32_to_cpu(rec->e_cpos);
2975 out:
2976 brelse(eb_bh);
2977 return ret;
2978 }
2979
2980 typedef int (xattr_bucket_func)(struct inode *inode,
2981 struct ocfs2_xattr_bucket *bucket,
2982 void *para);
2983
2984 static int ocfs2_find_xe_in_bucket(struct inode *inode,
2985 struct ocfs2_xattr_bucket *bucket,
2986 int name_index,
2987 const char *name,
2988 u32 name_hash,
2989 u16 *xe_index,
2990 int *found)
2991 {
2992 int i, ret = 0, cmp = 1, block_off, new_offset;
2993 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
2994 size_t name_len = strlen(name);
2995 struct ocfs2_xattr_entry *xe = NULL;
2996 char *xe_name;
2997
2998 /*
2999 * We don't use binary search in the bucket because there
3000 * may be multiple entries with the same name hash.
3001 */
3002 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3003 xe = &xh->xh_entries[i];
3004
3005 if (name_hash > le32_to_cpu(xe->xe_name_hash))
3006 continue;
3007 else if (name_hash < le32_to_cpu(xe->xe_name_hash))
3008 break;
3009
3010 cmp = name_index - ocfs2_xattr_get_type(xe);
3011 if (!cmp)
3012 cmp = name_len - xe->xe_name_len;
3013 if (cmp)
3014 continue;
3015
3016 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3017 xh,
3018 i,
3019 &block_off,
3020 &new_offset);
3021 if (ret) {
3022 mlog_errno(ret);
3023 break;
3024 }
3025
3026
3027 xe_name = bucket_block(bucket, block_off) + new_offset;
3028 if (!memcmp(name, xe_name, name_len)) {
3029 *xe_index = i;
3030 *found = 1;
3031 ret = 0;
3032 break;
3033 }
3034 }
3035
3036 return ret;
3037 }
3038
3039 /*
3040 * Find the specified xattr entry in a series of buckets.
3041 * This series start from p_blkno and last for num_clusters.
3042 * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
3043 * the num of the valid buckets.
3044 *
3045 * Return the buffer_head this xattr should reside in. And if the xattr's
3046 * hash is in the gap of 2 buckets, return the lower bucket.
3047 */
3048 static int ocfs2_xattr_bucket_find(struct inode *inode,
3049 int name_index,
3050 const char *name,
3051 u32 name_hash,
3052 u64 p_blkno,
3053 u32 first_hash,
3054 u32 num_clusters,
3055 struct ocfs2_xattr_search *xs)
3056 {
3057 int ret, found = 0;
3058 struct ocfs2_xattr_header *xh = NULL;
3059 struct ocfs2_xattr_entry *xe = NULL;
3060 u16 index = 0;
3061 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3062 int low_bucket = 0, bucket, high_bucket;
3063 struct ocfs2_xattr_bucket *search;
3064 u32 last_hash;
3065 u64 blkno, lower_blkno = 0;
3066
3067 search = ocfs2_xattr_bucket_new(inode);
3068 if (!search) {
3069 ret = -ENOMEM;
3070 mlog_errno(ret);
3071 goto out;
3072 }
3073
3074 ret = ocfs2_read_xattr_bucket(search, p_blkno);
3075 if (ret) {
3076 mlog_errno(ret);
3077 goto out;
3078 }
3079
3080 xh = bucket_xh(search);
3081 high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
3082 while (low_bucket <= high_bucket) {
3083 ocfs2_xattr_bucket_relse(search);
3084
3085 bucket = (low_bucket + high_bucket) / 2;
3086 blkno = p_blkno + bucket * blk_per_bucket;
3087 ret = ocfs2_read_xattr_bucket(search, blkno);
3088 if (ret) {
3089 mlog_errno(ret);
3090 goto out;
3091 }
3092
3093 xh = bucket_xh(search);
3094 xe = &xh->xh_entries[0];
3095 if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
3096 high_bucket = bucket - 1;
3097 continue;
3098 }
3099
3100 /*
3101 * Check whether the hash of the last entry in our
3102 * bucket is larger than the search one. for an empty
3103 * bucket, the last one is also the first one.
3104 */
3105 if (xh->xh_count)
3106 xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
3107
3108 last_hash = le32_to_cpu(xe->xe_name_hash);
3109
3110 /* record lower_blkno which may be the insert place. */
3111 lower_blkno = blkno;
3112
3113 if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
3114 low_bucket = bucket + 1;
3115 continue;
3116 }
3117
3118 /* the searched xattr should reside in this bucket if exists. */
3119 ret = ocfs2_find_xe_in_bucket(inode, search,
3120 name_index, name, name_hash,
3121 &index, &found);
3122 if (ret) {
3123 mlog_errno(ret);
3124 goto out;
3125 }
3126 break;
3127 }
3128
3129 /*
3130 * Record the bucket we have found.
3131 * When the xattr's hash value is in the gap of 2 buckets, we will
3132 * always set it to the previous bucket.
3133 */
3134 if (!lower_blkno)
3135 lower_blkno = p_blkno;
3136
3137 /* This should be in cache - we just read it during the search */
3138 ret = ocfs2_read_xattr_bucket(xs->bucket, lower_blkno);
3139 if (ret) {
3140 mlog_errno(ret);
3141 goto out;
3142 }
3143
3144 xs->header = bucket_xh(xs->bucket);
3145 xs->base = bucket_block(xs->bucket, 0);
3146 xs->end = xs->base + inode->i_sb->s_blocksize;
3147
3148 if (found) {
3149 xs->here = &xs->header->xh_entries[index];
3150 mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name,
3151 (unsigned long long)bucket_blkno(xs->bucket), index);
3152 } else
3153 ret = -ENODATA;
3154
3155 out:
3156 ocfs2_xattr_bucket_free(search);
3157 return ret;
3158 }
3159
3160 static int ocfs2_xattr_index_block_find(struct inode *inode,
3161 struct buffer_head *root_bh,
3162 int name_index,
3163 const char *name,
3164 struct ocfs2_xattr_search *xs)
3165 {
3166 int ret;
3167 struct ocfs2_xattr_block *xb =
3168 (struct ocfs2_xattr_block *)root_bh->b_data;
3169 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3170 struct ocfs2_extent_list *el = &xb_root->xt_list;
3171 u64 p_blkno = 0;
3172 u32 first_hash, num_clusters = 0;
3173 u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
3174
3175 if (le16_to_cpu(el->l_next_free_rec) == 0)
3176 return -ENODATA;
3177
3178 mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n",
3179 name, name_hash, name_index);
3180
3181 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
3182 &num_clusters, el);
3183 if (ret) {
3184 mlog_errno(ret);
3185 goto out;
3186 }
3187
3188 BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
3189
3190 mlog(0, "find xattr extent rec %u clusters from %llu, the first hash "
3191 "in the rec is %u\n", num_clusters, (unsigned long long)p_blkno,
3192 first_hash);
3193
3194 ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
3195 p_blkno, first_hash, num_clusters, xs);
3196
3197 out:
3198 return ret;
3199 }
3200
3201 static int ocfs2_iterate_xattr_buckets(struct inode *inode,
3202 u64 blkno,
3203 u32 clusters,
3204 xattr_bucket_func *func,
3205 void *para)
3206 {
3207 int i, ret = 0;
3208 u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
3209 u32 num_buckets = clusters * bpc;
3210 struct ocfs2_xattr_bucket *bucket;
3211
3212 bucket = ocfs2_xattr_bucket_new(inode);
3213 if (!bucket) {
3214 mlog_errno(-ENOMEM);
3215 return -ENOMEM;
3216 }
3217
3218 mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n",
3219 clusters, (unsigned long long)blkno);
3220
3221 for (i = 0; i < num_buckets; i++, blkno += bucket->bu_blocks) {
3222 ret = ocfs2_read_xattr_bucket(bucket, blkno);
3223 if (ret) {
3224 mlog_errno(ret);
3225 break;
3226 }
3227
3228 /*
3229 * The real bucket num in this series of blocks is stored
3230 * in the 1st bucket.
3231 */
3232 if (i == 0)
3233 num_buckets = le16_to_cpu(bucket_xh(bucket)->xh_num_buckets);
3234
3235 mlog(0, "iterating xattr bucket %llu, first hash %u\n",
3236 (unsigned long long)blkno,
3237 le32_to_cpu(bucket_xh(bucket)->xh_entries[0].xe_name_hash));
3238 if (func) {
3239 ret = func(inode, bucket, para);
3240 if (ret && ret != -ERANGE)
3241 mlog_errno(ret);
3242 /* Fall through to bucket_relse() */
3243 }
3244
3245 ocfs2_xattr_bucket_relse(bucket);
3246 if (ret)
3247 break;
3248 }
3249
3250 ocfs2_xattr_bucket_free(bucket);
3251 return ret;
3252 }
3253
3254 struct ocfs2_xattr_tree_list {
3255 char *buffer;
3256 size_t buffer_size;
3257 size_t result;
3258 };
3259
3260 static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
3261 struct ocfs2_xattr_header *xh,
3262 int index,
3263 int *block_off,
3264 int *new_offset)
3265 {
3266 u16 name_offset;
3267
3268 if (index < 0 || index >= le16_to_cpu(xh->xh_count))
3269 return -EINVAL;
3270
3271 name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
3272
3273 *block_off = name_offset >> sb->s_blocksize_bits;
3274 *new_offset = name_offset % sb->s_blocksize;
3275
3276 return 0;
3277 }
3278
3279 static int ocfs2_list_xattr_bucket(struct inode *inode,
3280 struct ocfs2_xattr_bucket *bucket,
3281 void *para)
3282 {
3283 int ret = 0, type;
3284 struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
3285 int i, block_off, new_offset;
3286 const char *prefix, *name;
3287
3288 for (i = 0 ; i < le16_to_cpu(bucket_xh(bucket)->xh_count); i++) {
3289 struct ocfs2_xattr_entry *entry = &bucket_xh(bucket)->xh_entries[i];
3290 type = ocfs2_xattr_get_type(entry);
3291 prefix = ocfs2_xattr_prefix(type);
3292
3293 if (prefix) {
3294 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3295 bucket_xh(bucket),
3296 i,
3297 &block_off,
3298 &new_offset);
3299 if (ret)
3300 break;
3301
3302 name = (const char *)bucket_block(bucket, block_off) +
3303 new_offset;
3304 ret = ocfs2_xattr_list_entry(xl->buffer,
3305 xl->buffer_size,
3306 &xl->result,
3307 prefix, name,
3308 entry->xe_name_len);
3309 if (ret)
3310 break;
3311 }
3312 }
3313
3314 return ret;
3315 }
3316
3317 static int ocfs2_iterate_xattr_index_block(struct inode *inode,
3318 struct buffer_head *blk_bh,
3319 xattr_tree_rec_func *rec_func,
3320 void *para)
3321 {
3322 struct ocfs2_xattr_block *xb =
3323 (struct ocfs2_xattr_block *)blk_bh->b_data;
3324 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
3325 int ret = 0;
3326 u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
3327 u64 p_blkno = 0;
3328
3329 if (!el->l_next_free_rec || !rec_func)
3330 return 0;
3331
3332 while (name_hash > 0) {
3333 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
3334 &e_cpos, &num_clusters, el);
3335 if (ret) {
3336 mlog_errno(ret);
3337 break;
3338 }
3339
3340 ret = rec_func(inode, blk_bh, p_blkno, e_cpos,
3341 num_clusters, para);
3342 if (ret) {
3343 if (ret != -ERANGE)
3344 mlog_errno(ret);
3345 break;
3346 }
3347
3348 if (e_cpos == 0)
3349 break;
3350
3351 name_hash = e_cpos - 1;
3352 }
3353
3354 return ret;
3355
3356 }
3357
3358 static int ocfs2_list_xattr_tree_rec(struct inode *inode,
3359 struct buffer_head *root_bh,
3360 u64 blkno, u32 cpos, u32 len, void *para)
3361 {
3362 return ocfs2_iterate_xattr_buckets(inode, blkno, len,
3363 ocfs2_list_xattr_bucket, para);
3364 }
3365
3366 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
3367 struct buffer_head *blk_bh,
3368 char *buffer,
3369 size_t buffer_size)
3370 {
3371 int ret;
3372 struct ocfs2_xattr_tree_list xl = {
3373 .buffer = buffer,
3374 .buffer_size = buffer_size,
3375 .result = 0,
3376 };
3377
3378 ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
3379 ocfs2_list_xattr_tree_rec, &xl);
3380 if (ret) {
3381 mlog_errno(ret);
3382 goto out;
3383 }
3384
3385 ret = xl.result;
3386 out:
3387 return ret;
3388 }
3389
3390 static int cmp_xe(const void *a, const void *b)
3391 {
3392 const struct ocfs2_xattr_entry *l = a, *r = b;
3393 u32 l_hash = le32_to_cpu(l->xe_name_hash);
3394 u32 r_hash = le32_to_cpu(r->xe_name_hash);
3395
3396 if (l_hash > r_hash)
3397 return 1;
3398 if (l_hash < r_hash)
3399 return -1;
3400 return 0;
3401 }
3402
3403 static void swap_xe(void *a, void *b, int size)
3404 {
3405 struct ocfs2_xattr_entry *l = a, *r = b, tmp;
3406
3407 tmp = *l;
3408 memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
3409 memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
3410 }
3411
3412 /*
3413 * When the ocfs2_xattr_block is filled up, new bucket will be created
3414 * and all the xattr entries will be moved to the new bucket.
3415 * The header goes at the start of the bucket, and the names+values are
3416 * filled from the end. This is why *target starts as the last buffer.
3417 * Note: we need to sort the entries since they are not saved in order
3418 * in the ocfs2_xattr_block.
3419 */
3420 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
3421 struct buffer_head *xb_bh,
3422 struct ocfs2_xattr_bucket *bucket)
3423 {
3424 int i, blocksize = inode->i_sb->s_blocksize;
3425 int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3426 u16 offset, size, off_change;
3427 struct ocfs2_xattr_entry *xe;
3428 struct ocfs2_xattr_block *xb =
3429 (struct ocfs2_xattr_block *)xb_bh->b_data;
3430 struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
3431 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
3432 u16 count = le16_to_cpu(xb_xh->xh_count);
3433 char *src = xb_bh->b_data;
3434 char *target = bucket_block(bucket, blks - 1);
3435
3436 mlog(0, "cp xattr from block %llu to bucket %llu\n",
3437 (unsigned long long)xb_bh->b_blocknr,
3438 (unsigned long long)bucket_blkno(bucket));
3439
3440 for (i = 0; i < blks; i++)
3441 memset(bucket_block(bucket, i), 0, blocksize);
3442
3443 /*
3444 * Since the xe_name_offset is based on ocfs2_xattr_header,
3445 * there is a offset change corresponding to the change of
3446 * ocfs2_xattr_header's position.
3447 */
3448 off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
3449 xe = &xb_xh->xh_entries[count - 1];
3450 offset = le16_to_cpu(xe->xe_name_offset) + off_change;
3451 size = blocksize - offset;
3452
3453 /* copy all the names and values. */
3454 memcpy(target + offset, src + offset, size);
3455
3456 /* Init new header now. */
3457 xh->xh_count = xb_xh->xh_count;
3458 xh->xh_num_buckets = cpu_to_le16(1);
3459 xh->xh_name_value_len = cpu_to_le16(size);
3460 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
3461
3462 /* copy all the entries. */
3463 target = bucket_block(bucket, 0);
3464 offset = offsetof(struct ocfs2_xattr_header, xh_entries);
3465 size = count * sizeof(struct ocfs2_xattr_entry);
3466 memcpy(target + offset, (char *)xb_xh + offset, size);
3467
3468 /* Change the xe offset for all the xe because of the move. */
3469 off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
3470 offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
3471 for (i = 0; i < count; i++)
3472 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
3473
3474 mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n",
3475 offset, size, off_change);
3476
3477 sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
3478 cmp_xe, swap_xe);
3479 }
3480
3481 /*
3482 * After we move xattr from block to index btree, we have to
3483 * update ocfs2_xattr_search to the new xe and base.
3484 *
3485 * When the entry is in xattr block, xattr_bh indicates the storage place.
3486 * While if the entry is in index b-tree, "bucket" indicates the
3487 * real place of the xattr.
3488 */
3489 static void ocfs2_xattr_update_xattr_search(struct inode *inode,
3490 struct ocfs2_xattr_search *xs,
3491 struct buffer_head *old_bh)
3492 {
3493 char *buf = old_bh->b_data;
3494 struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
3495 struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
3496 int i;
3497
3498 xs->header = bucket_xh(xs->bucket);
3499 xs->base = bucket_block(xs->bucket, 0);
3500 xs->end = xs->base + inode->i_sb->s_blocksize;
3501
3502 if (xs->not_found)
3503 return;
3504
3505 i = xs->here - old_xh->xh_entries;
3506 xs->here = &xs->header->xh_entries[i];
3507 }
3508
3509 static int ocfs2_xattr_create_index_block(struct inode *inode,
3510 struct ocfs2_xattr_search *xs,
3511 struct ocfs2_xattr_set_ctxt *ctxt)
3512 {
3513 int ret;
3514 u32 bit_off, len;
3515 u64 blkno;
3516 handle_t *handle = ctxt->handle;
3517 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3518 struct ocfs2_inode_info *oi = OCFS2_I(inode);
3519 struct buffer_head *xb_bh = xs->xattr_bh;
3520 struct ocfs2_xattr_block *xb =
3521 (struct ocfs2_xattr_block *)xb_bh->b_data;
3522 struct ocfs2_xattr_tree_root *xr;
3523 u16 xb_flags = le16_to_cpu(xb->xb_flags);
3524
3525 mlog(0, "create xattr index block for %llu\n",
3526 (unsigned long long)xb_bh->b_blocknr);
3527
3528 BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
3529 BUG_ON(!xs->bucket);
3530
3531 /*
3532 * XXX:
3533 * We can use this lock for now, and maybe move to a dedicated mutex
3534 * if performance becomes a problem later.
3535 */
3536 down_write(&oi->ip_alloc_sem);
3537
3538 ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), xb_bh,
3539 OCFS2_JOURNAL_ACCESS_WRITE);
3540 if (ret) {
3541 mlog_errno(ret);
3542 goto out;
3543 }
3544
3545 ret = __ocfs2_claim_clusters(osb, handle, ctxt->data_ac,
3546 1, 1, &bit_off, &len);
3547 if (ret) {
3548 mlog_errno(ret);
3549 goto out;
3550 }
3551
3552 /*
3553 * The bucket may spread in many blocks, and
3554 * we will only touch the 1st block and the last block
3555 * in the whole bucket(one for entry and one for data).
3556 */
3557 blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
3558
3559 mlog(0, "allocate 1 cluster from %llu to xattr block\n",
3560 (unsigned long long)blkno);
3561
3562 ret = ocfs2_init_xattr_bucket(xs->bucket, blkno);
3563 if (ret) {
3564 mlog_errno(ret);
3565 goto out;
3566 }
3567
3568 ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
3569 OCFS2_JOURNAL_ACCESS_CREATE);
3570 if (ret) {
3571 mlog_errno(ret);
3572 goto out;
3573 }
3574
3575 ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xs->bucket);
3576 ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
3577
3578 ocfs2_xattr_update_xattr_search(inode, xs, xb_bh);
3579
3580 /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
3581 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
3582 offsetof(struct ocfs2_xattr_block, xb_attrs));
3583
3584 xr = &xb->xb_attrs.xb_root;
3585 xr->xt_clusters = cpu_to_le32(1);
3586 xr->xt_last_eb_blk = 0;
3587 xr->xt_list.l_tree_depth = 0;
3588 xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
3589 xr->xt_list.l_next_free_rec = cpu_to_le16(1);
3590
3591 xr->xt_list.l_recs[0].e_cpos = 0;
3592 xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
3593 xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
3594
3595 xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
3596
3597 ocfs2_journal_dirty(handle, xb_bh);
3598
3599 out:
3600 up_write(&oi->ip_alloc_sem);
3601
3602 return ret;
3603 }
3604
3605 static int cmp_xe_offset(const void *a, const void *b)
3606 {
3607 const struct ocfs2_xattr_entry *l = a, *r = b;
3608 u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
3609 u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
3610
3611 if (l_name_offset < r_name_offset)
3612 return 1;
3613 if (l_name_offset > r_name_offset)
3614 return -1;
3615 return 0;
3616 }
3617
3618 /*
3619 * defrag a xattr bucket if we find that the bucket has some
3620 * holes beteen name/value pairs.
3621 * We will move all the name/value pairs to the end of the bucket
3622 * so that we can spare some space for insertion.
3623 */
3624 static int ocfs2_defrag_xattr_bucket(struct inode *inode,
3625 handle_t *handle,
3626 struct ocfs2_xattr_bucket *bucket)
3627 {
3628 int ret, i;
3629 size_t end, offset, len, value_len;
3630 struct ocfs2_xattr_header *xh;
3631 char *entries, *buf, *bucket_buf = NULL;
3632 u64 blkno = bucket_blkno(bucket);
3633 u16 xh_free_start;
3634 size_t blocksize = inode->i_sb->s_blocksize;
3635 struct ocfs2_xattr_entry *xe;
3636
3637 /*
3638 * In order to make the operation more efficient and generic,
3639 * we copy all the blocks into a contiguous memory and do the
3640 * defragment there, so if anything is error, we will not touch
3641 * the real block.
3642 */
3643 bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
3644 if (!bucket_buf) {
3645 ret = -EIO;
3646 goto out;
3647 }
3648
3649 buf = bucket_buf;
3650 for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
3651 memcpy(buf, bucket_block(bucket, i), blocksize);
3652
3653 ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
3654 OCFS2_JOURNAL_ACCESS_WRITE);
3655 if (ret < 0) {
3656 mlog_errno(ret);
3657 goto out;
3658 }
3659
3660 xh = (struct ocfs2_xattr_header *)bucket_buf;
3661 entries = (char *)xh->xh_entries;
3662 xh_free_start = le16_to_cpu(xh->xh_free_start);
3663
3664 mlog(0, "adjust xattr bucket in %llu, count = %u, "
3665 "xh_free_start = %u, xh_name_value_len = %u.\n",
3666 (unsigned long long)blkno, le16_to_cpu(xh->xh_count),
3667 xh_free_start, le16_to_cpu(xh->xh_name_value_len));
3668
3669 /*
3670 * sort all the entries by their offset.
3671 * the largest will be the first, so that we can
3672 * move them to the end one by one.
3673 */
3674 sort(entries, le16_to_cpu(xh->xh_count),
3675 sizeof(struct ocfs2_xattr_entry),
3676 cmp_xe_offset, swap_xe);
3677
3678 /* Move all name/values to the end of the bucket. */
3679 xe = xh->xh_entries;
3680 end = OCFS2_XATTR_BUCKET_SIZE;
3681 for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
3682 offset = le16_to_cpu(xe->xe_name_offset);
3683 if (ocfs2_xattr_is_local(xe))
3684 value_len = OCFS2_XATTR_SIZE(
3685 le64_to_cpu(xe->xe_value_size));
3686 else
3687 value_len = OCFS2_XATTR_ROOT_SIZE;
3688 len = OCFS2_XATTR_SIZE(xe->xe_name_len) + value_len;
3689
3690 /*
3691 * We must make sure that the name/value pair
3692 * exist in the same block. So adjust end to
3693 * the previous block end if needed.
3694 */
3695 if (((end - len) / blocksize !=
3696 (end - 1) / blocksize))
3697 end = end - end % blocksize;
3698
3699 if (end > offset + len) {
3700 memmove(bucket_buf + end - len,
3701 bucket_buf + offset, len);
3702 xe->xe_name_offset = cpu_to_le16(end - len);
3703 }
3704
3705 mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
3706 "bucket %llu\n", (unsigned long long)blkno);
3707
3708 end -= len;
3709 }
3710
3711 mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
3712 "bucket %llu\n", (unsigned long long)blkno);
3713
3714 if (xh_free_start == end)
3715 goto out;
3716
3717 memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
3718 xh->xh_free_start = cpu_to_le16(end);
3719
3720 /* sort the entries by their name_hash. */
3721 sort(entries, le16_to_cpu(xh->xh_count),
3722 sizeof(struct ocfs2_xattr_entry),
3723 cmp_xe, swap_xe);
3724
3725 buf = bucket_buf;
3726 for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
3727 memcpy(bucket_block(bucket, i), buf, blocksize);
3728 ocfs2_xattr_bucket_journal_dirty(handle, bucket);
3729
3730 out:
3731 kfree(bucket_buf);
3732 return ret;
3733 }
3734
3735 /*
3736 * prev_blkno points to the start of an existing extent. new_blkno
3737 * points to a newly allocated extent. Because we know each of our
3738 * clusters contains more than bucket, we can easily split one cluster
3739 * at a bucket boundary. So we take the last cluster of the existing
3740 * extent and split it down the middle. We move the last half of the
3741 * buckets in the last cluster of the existing extent over to the new
3742 * extent.
3743 *
3744 * first_bh is the buffer at prev_blkno so we can update the existing
3745 * extent's bucket count. header_bh is the bucket were we were hoping
3746 * to insert our xattr. If the bucket move places the target in the new
3747 * extent, we'll update first_bh and header_bh after modifying the old
3748 * extent.
3749 *
3750 * first_hash will be set as the 1st xe's name_hash in the new extent.
3751 */
3752 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
3753 handle_t *handle,
3754 struct ocfs2_xattr_bucket *first,
3755 struct ocfs2_xattr_bucket *target,
3756 u64 new_blkno,
3757 u32 num_clusters,
3758 u32 *first_hash)
3759 {
3760 int ret;
3761 struct super_block *sb = inode->i_sb;
3762 int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(sb);
3763 int num_buckets = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(sb));
3764 int to_move = num_buckets / 2;
3765 u64 src_blkno;
3766 u64 last_cluster_blkno = bucket_blkno(first) +
3767 ((num_clusters - 1) * ocfs2_clusters_to_blocks(sb, 1));
3768
3769 BUG_ON(le16_to_cpu(bucket_xh(first)->xh_num_buckets) < num_buckets);
3770 BUG_ON(OCFS2_XATTR_BUCKET_SIZE == OCFS2_SB(sb)->s_clustersize);
3771
3772 mlog(0, "move half of xattrs in cluster %llu to %llu\n",
3773 (unsigned long long)last_cluster_blkno, (unsigned long long)new_blkno);
3774
3775 ret = ocfs2_mv_xattr_buckets(inode, handle, bucket_blkno(first),
3776 last_cluster_blkno, new_blkno,
3777 to_move, first_hash);
3778 if (ret) {
3779 mlog_errno(ret);
3780 goto out;
3781 }
3782
3783 /* This is the first bucket that got moved */
3784 src_blkno = last_cluster_blkno + (to_move * blks_per_bucket);
3785
3786 /*
3787 * If the target bucket was part of the moved buckets, we need to
3788 * update first and target.
3789 */
3790 if (bucket_blkno(target) >= src_blkno) {
3791 /* Find the block for the new target bucket */
3792 src_blkno = new_blkno +
3793 (bucket_blkno(target) - src_blkno);
3794
3795 ocfs2_xattr_bucket_relse(first);
3796 ocfs2_xattr_bucket_relse(target);
3797
3798 /*
3799 * These shouldn't fail - the buffers are in the
3800 * journal from ocfs2_cp_xattr_bucket().
3801 */
3802 ret = ocfs2_read_xattr_bucket(first, new_blkno);
3803 if (ret) {
3804 mlog_errno(ret);
3805 goto out;
3806 }
3807 ret = ocfs2_read_xattr_bucket(target, src_blkno);
3808 if (ret)
3809 mlog_errno(ret);
3810
3811 }
3812
3813 out:
3814 return ret;
3815 }
3816
3817 /*
3818 * Find the suitable pos when we divide a bucket into 2.
3819 * We have to make sure the xattrs with the same hash value exist
3820 * in the same bucket.
3821 *
3822 * If this ocfs2_xattr_header covers more than one hash value, find a
3823 * place where the hash value changes. Try to find the most even split.
3824 * The most common case is that all entries have different hash values,
3825 * and the first check we make will find a place to split.
3826 */
3827 static int ocfs2_xattr_find_divide_pos(struct ocfs2_xattr_header *xh)
3828 {
3829 struct ocfs2_xattr_entry *entries = xh->xh_entries;
3830 int count = le16_to_cpu(xh->xh_count);
3831 int delta, middle = count / 2;
3832
3833 /*
3834 * We start at the middle. Each step gets farther away in both
3835 * directions. We therefore hit the change in hash value
3836 * nearest to the middle. Note that this loop does not execute for
3837 * count < 2.
3838 */
3839 for (delta = 0; delta < middle; delta++) {
3840 /* Let's check delta earlier than middle */
3841 if (cmp_xe(&entries[middle - delta - 1],
3842 &entries[middle - delta]))
3843 return middle - delta;
3844
3845 /* For even counts, don't walk off the end */
3846 if ((middle + delta + 1) == count)
3847 continue;
3848
3849 /* Now try delta past middle */
3850 if (cmp_xe(&entries[middle + delta],
3851 &entries[middle + delta + 1]))
3852 return middle + delta + 1;
3853 }
3854
3855 /* Every entry had the same hash */
3856 return count;
3857 }
3858
3859 /*
3860 * Move some xattrs in old bucket(blk) to new bucket(new_blk).
3861 * first_hash will record the 1st hash of the new bucket.
3862 *
3863 * Normally half of the xattrs will be moved. But we have to make
3864 * sure that the xattrs with the same hash value are stored in the
3865 * same bucket. If all the xattrs in this bucket have the same hash
3866 * value, the new bucket will be initialized as an empty one and the
3867 * first_hash will be initialized as (hash_value+1).
3868 */
3869 static int ocfs2_divide_xattr_bucket(struct inode *inode,
3870 handle_t *handle,
3871 u64 blk,
3872 u64 new_blk,
3873 u32 *first_hash,
3874 int new_bucket_head)
3875 {
3876 int ret, i;
3877 int count, start, len, name_value_len = 0, xe_len, name_offset = 0;
3878 struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
3879 struct ocfs2_xattr_header *xh;
3880 struct ocfs2_xattr_entry *xe;
3881 int blocksize = inode->i_sb->s_blocksize;
3882
3883 mlog(0, "move some of xattrs from bucket %llu to %llu\n",
3884 (unsigned long long)blk, (unsigned long long)new_blk);
3885
3886 s_bucket = ocfs2_xattr_bucket_new(inode);
3887 t_bucket = ocfs2_xattr_bucket_new(inode);
3888 if (!s_bucket || !t_bucket) {
3889 ret = -ENOMEM;
3890 mlog_errno(ret);
3891 goto out;
3892 }
3893
3894 ret = ocfs2_read_xattr_bucket(s_bucket, blk);
3895 if (ret) {
3896 mlog_errno(ret);
3897 goto out;
3898 }
3899
3900 ret = ocfs2_xattr_bucket_journal_access(handle, s_bucket,
3901 OCFS2_JOURNAL_ACCESS_WRITE);
3902 if (ret) {
3903 mlog_errno(ret);
3904 goto out;
3905 }
3906
3907 /*
3908 * Even if !new_bucket_head, we're overwriting t_bucket. Thus,
3909 * there's no need to read it.
3910 */
3911 ret = ocfs2_init_xattr_bucket(t_bucket, new_blk);
3912 if (ret) {
3913 mlog_errno(ret);
3914 goto out;
3915 }
3916
3917 /*
3918 * Hey, if we're overwriting t_bucket, what difference does
3919 * ACCESS_CREATE vs ACCESS_WRITE make? See the comment in the
3920 * same part of ocfs2_cp_xattr_bucket().
3921 */
3922 ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
3923 new_bucket_head ?
3924 OCFS2_JOURNAL_ACCESS_CREATE :
3925 OCFS2_JOURNAL_ACCESS_WRITE);
3926 if (ret) {
3927 mlog_errno(ret);
3928 goto out;
3929 }
3930
3931 xh = bucket_xh(s_bucket);
3932 count = le16_to_cpu(xh->xh_count);
3933 start = ocfs2_xattr_find_divide_pos(xh);
3934
3935 if (start == count) {
3936 xe = &xh->xh_entries[start-1];
3937
3938 /*
3939 * initialized a new empty bucket here.
3940 * The hash value is set as one larger than
3941 * that of the last entry in the previous bucket.
3942 */
3943 for (i = 0; i < t_bucket->bu_blocks; i++)
3944 memset(bucket_block(t_bucket, i), 0, blocksize);
3945
3946 xh = bucket_xh(t_bucket);
3947 xh->xh_free_start = cpu_to_le16(blocksize);
3948 xh->xh_entries[0].xe_name_hash = xe->xe_name_hash;
3949 le32_add_cpu(&xh->xh_entries[0].xe_name_hash, 1);
3950
3951 goto set_num_buckets;
3952 }
3953
3954 /* copy the whole bucket to the new first. */
3955 ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
3956
3957 /* update the new bucket. */
3958 xh = bucket_xh(t_bucket);
3959
3960 /*
3961 * Calculate the total name/value len and xh_free_start for
3962 * the old bucket first.
3963 */
3964 name_offset = OCFS2_XATTR_BUCKET_SIZE;
3965 name_value_len = 0;
3966 for (i = 0; i < start; i++) {
3967 xe = &xh->xh_entries[i];
3968 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3969 if (ocfs2_xattr_is_local(xe))
3970 xe_len +=
3971 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3972 else
3973 xe_len += OCFS2_XATTR_ROOT_SIZE;
3974 name_value_len += xe_len;
3975 if (le16_to_cpu(xe->xe_name_offset) < name_offset)
3976 name_offset = le16_to_cpu(xe->xe_name_offset);
3977 }
3978
3979 /*
3980 * Now begin the modification to the new bucket.
3981 *
3982 * In the new bucket, We just move the xattr entry to the beginning
3983 * and don't touch the name/value. So there will be some holes in the
3984 * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
3985 * called.
3986 */
3987 xe = &xh->xh_entries[start];
3988 len = sizeof(struct ocfs2_xattr_entry) * (count - start);
3989 mlog(0, "mv xattr entry len %d from %d to %d\n", len,
3990 (int)((char *)xe - (char *)xh),
3991 (int)((char *)xh->xh_entries - (char *)xh));
3992 memmove((char *)xh->xh_entries, (char *)xe, len);
3993 xe = &xh->xh_entries[count - start];
3994 len = sizeof(struct ocfs2_xattr_entry) * start;
3995 memset((char *)xe, 0, len);
3996
3997 le16_add_cpu(&xh->xh_count, -start);
3998 le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
3999
4000 /* Calculate xh_free_start for the new bucket. */
4001 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
4002 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
4003 xe = &xh->xh_entries[i];
4004 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
4005 if (ocfs2_xattr_is_local(xe))
4006 xe_len +=
4007 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
4008 else
4009 xe_len += OCFS2_XATTR_ROOT_SIZE;
4010 if (le16_to_cpu(xe->xe_name_offset) <
4011 le16_to_cpu(xh->xh_free_start))
4012 xh->xh_free_start = xe->xe_name_offset;
4013 }
4014
4015 set_num_buckets:
4016 /* set xh->xh_num_buckets for the new xh. */
4017 if (new_bucket_head)
4018 xh->xh_num_buckets = cpu_to_le16(1);
4019 else
4020 xh->xh_num_buckets = 0;
4021
4022 ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4023
4024 /* store the first_hash of the new bucket. */
4025 if (first_hash)
4026 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
4027
4028 /*
4029 * Now only update the 1st block of the old bucket. If we
4030 * just added a new empty bucket, there is no need to modify
4031 * it.
4032 */
4033 if (start == count)
4034 goto out;
4035
4036 xh = bucket_xh(s_bucket);
4037 memset(&xh->xh_entries[start], 0,
4038 sizeof(struct ocfs2_xattr_entry) * (count - start));
4039 xh->xh_count = cpu_to_le16(start);
4040 xh->xh_free_start = cpu_to_le16(name_offset);
4041 xh->xh_name_value_len = cpu_to_le16(name_value_len);
4042
4043 ocfs2_xattr_bucket_journal_dirty(handle, s_bucket);
4044
4045 out:
4046 ocfs2_xattr_bucket_free(s_bucket);
4047 ocfs2_xattr_bucket_free(t_bucket);
4048
4049 return ret;
4050 }
4051
4052 /*
4053 * Copy xattr from one bucket to another bucket.
4054 *
4055 * The caller must make sure that the journal transaction
4056 * has enough space for journaling.
4057 */
4058 static int ocfs2_cp_xattr_bucket(struct inode *inode,
4059 handle_t *handle,
4060 u64 s_blkno,
4061 u64 t_blkno,
4062 int t_is_new)
4063 {
4064 int ret;
4065 struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
4066
4067 BUG_ON(s_blkno == t_blkno);
4068
4069 mlog(0, "cp bucket %llu to %llu, target is %d\n",
4070 (unsigned long long)s_blkno, (unsigned long long)t_blkno,
4071 t_is_new);
4072
4073 s_bucket = ocfs2_xattr_bucket_new(inode);
4074 t_bucket = ocfs2_xattr_bucket_new(inode);
4075 if (!s_bucket || !t_bucket) {
4076 ret = -ENOMEM;
4077 mlog_errno(ret);
4078 goto out;
4079 }
4080
4081 ret = ocfs2_read_xattr_bucket(s_bucket, s_blkno);
4082 if (ret)
4083 goto out;
4084
4085 /*
4086 * Even if !t_is_new, we're overwriting t_bucket. Thus,
4087 * there's no need to read it.
4088 */
4089 ret = ocfs2_init_xattr_bucket(t_bucket, t_blkno);
4090 if (ret)
4091 goto out;
4092
4093 /*
4094 * Hey, if we're overwriting t_bucket, what difference does
4095 * ACCESS_CREATE vs ACCESS_WRITE make? Well, if we allocated a new
4096 * cluster to fill, we came here from
4097 * ocfs2_mv_xattr_buckets(), and it is really new -
4098 * ACCESS_CREATE is required. But we also might have moved data
4099 * out of t_bucket before extending back into it.
4100 * ocfs2_add_new_xattr_bucket() can do this - its call to
4101 * ocfs2_add_new_xattr_cluster() may have created a new extent
4102 * and copied out the end of the old extent. Then it re-extends
4103 * the old extent back to create space for new xattrs. That's
4104 * how we get here, and the bucket isn't really new.
4105 */
4106 ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4107 t_is_new ?
4108 OCFS2_JOURNAL_ACCESS_CREATE :
4109 OCFS2_JOURNAL_ACCESS_WRITE);
4110 if (ret)
4111 goto out;
4112
4113 ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4114 ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4115
4116 out:
4117 ocfs2_xattr_bucket_free(t_bucket);
4118 ocfs2_xattr_bucket_free(s_bucket);
4119
4120 return ret;
4121 }
4122
4123 /*
4124 * src_blk points to the start of an existing extent. last_blk points to
4125 * last cluster in that extent. to_blk points to a newly allocated
4126 * extent. We copy the buckets from the cluster at last_blk to the new
4127 * extent. If start_bucket is non-zero, we skip that many buckets before
4128 * we start copying. The new extent's xh_num_buckets gets set to the
4129 * number of buckets we copied. The old extent's xh_num_buckets shrinks
4130 * by the same amount.
4131 */
4132 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
4133 u64 src_blk, u64 last_blk, u64 to_blk,
4134 unsigned int start_bucket,
4135 u32 *first_hash)
4136 {
4137 int i, ret, credits;
4138 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4139 int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4140 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
4141 struct ocfs2_xattr_bucket *old_first, *new_first;
4142
4143 mlog(0, "mv xattrs from cluster %llu to %llu\n",
4144 (unsigned long long)last_blk, (unsigned long long)to_blk);
4145
4146 BUG_ON(start_bucket >= num_buckets);
4147 if (start_bucket) {
4148 num_buckets -= start_bucket;
4149 last_blk += (start_bucket * blks_per_bucket);
4150 }
4151
4152 /* The first bucket of the original extent */
4153 old_first = ocfs2_xattr_bucket_new(inode);
4154 /* The first bucket of the new extent */
4155 new_first = ocfs2_xattr_bucket_new(inode);
4156 if (!old_first || !new_first) {
4157 ret = -ENOMEM;
4158 mlog_errno(ret);
4159 goto out;
4160 }
4161
4162 ret = ocfs2_read_xattr_bucket(old_first, src_blk);
4163 if (ret) {
4164 mlog_errno(ret);
4165 goto out;
4166 }
4167
4168 /*
4169 * We need to update the first bucket of the old extent and all
4170 * the buckets going to the new extent.
4171 */
4172 credits = ((num_buckets + 1) * blks_per_bucket) +
4173 handle->h_buffer_credits;
4174 ret = ocfs2_extend_trans(handle, credits);
4175 if (ret) {
4176 mlog_errno(ret);
4177 goto out;
4178 }
4179
4180 ret = ocfs2_xattr_bucket_journal_access(handle, old_first,
4181 OCFS2_JOURNAL_ACCESS_WRITE);
4182 if (ret) {
4183 mlog_errno(ret);
4184 goto out;
4185 }
4186
4187 for (i = 0; i < num_buckets; i++) {
4188 ret = ocfs2_cp_xattr_bucket(inode, handle,
4189 last_blk + (i * blks_per_bucket),
4190 to_blk + (i * blks_per_bucket),
4191 1);
4192 if (ret) {
4193 mlog_errno(ret);
4194 goto out;
4195 }
4196 }
4197
4198 /*
4199 * Get the new bucket ready before we dirty anything
4200 * (This actually shouldn't fail, because we already dirtied
4201 * it once in ocfs2_cp_xattr_bucket()).
4202 */
4203 ret = ocfs2_read_xattr_bucket(new_first, to_blk);
4204 if (ret) {
4205 mlog_errno(ret);
4206 goto out;
4207 }
4208 ret = ocfs2_xattr_bucket_journal_access(handle, new_first,
4209 OCFS2_JOURNAL_ACCESS_WRITE);
4210 if (ret) {
4211 mlog_errno(ret);
4212 goto out;
4213 }
4214
4215 /* Now update the headers */
4216 le16_add_cpu(&bucket_xh(old_first)->xh_num_buckets, -num_buckets);
4217 ocfs2_xattr_bucket_journal_dirty(handle, old_first);
4218
4219 bucket_xh(new_first)->xh_num_buckets = cpu_to_le16(num_buckets);
4220 ocfs2_xattr_bucket_journal_dirty(handle, new_first);
4221
4222 if (first_hash)
4223 *first_hash = le32_to_cpu(bucket_xh(new_first)->xh_entries[0].xe_name_hash);
4224
4225 out:
4226 ocfs2_xattr_bucket_free(new_first);
4227 ocfs2_xattr_bucket_free(old_first);
4228 return ret;
4229 }
4230
4231 /*
4232 * Move some xattrs in this cluster to the new cluster.
4233 * This function should only be called when bucket size == cluster size.
4234 * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
4235 */
4236 static int ocfs2_divide_xattr_cluster(struct inode *inode,
4237 handle_t *handle,
4238 u64 prev_blk,
4239 u64 new_blk,
4240 u32 *first_hash)
4241 {
4242 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4243 int ret, credits = 2 * blk_per_bucket + handle->h_buffer_credits;
4244
4245 BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
4246
4247 ret = ocfs2_extend_trans(handle, credits);
4248 if (ret) {
4249 mlog_errno(ret);
4250 return ret;
4251 }
4252
4253 /* Move half of the xattr in start_blk to the next bucket. */
4254 return ocfs2_divide_xattr_bucket(inode, handle, prev_blk,
4255 new_blk, first_hash, 1);
4256 }
4257
4258 /*
4259 * Move some xattrs from the old cluster to the new one since they are not
4260 * contiguous in ocfs2 xattr tree.
4261 *
4262 * new_blk starts a new separate cluster, and we will move some xattrs from
4263 * prev_blk to it. v_start will be set as the first name hash value in this
4264 * new cluster so that it can be used as e_cpos during tree insertion and
4265 * don't collide with our original b-tree operations. first_bh and header_bh
4266 * will also be updated since they will be used in ocfs2_extend_xattr_bucket
4267 * to extend the insert bucket.
4268 *
4269 * The problem is how much xattr should we move to the new one and when should
4270 * we update first_bh and header_bh?
4271 * 1. If cluster size > bucket size, that means the previous cluster has more
4272 * than 1 bucket, so just move half nums of bucket into the new cluster and
4273 * update the first_bh and header_bh if the insert bucket has been moved
4274 * to the new cluster.
4275 * 2. If cluster_size == bucket_size:
4276 * a) If the previous extent rec has more than one cluster and the insert
4277 * place isn't in the last cluster, copy the entire last cluster to the
4278 * new one. This time, we don't need to upate the first_bh and header_bh
4279 * since they will not be moved into the new cluster.
4280 * b) Otherwise, move the bottom half of the xattrs in the last cluster into
4281 * the new one. And we set the extend flag to zero if the insert place is
4282 * moved into the new allocated cluster since no extend is needed.
4283 */
4284 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
4285 handle_t *handle,
4286 struct ocfs2_xattr_bucket *first,
4287 struct ocfs2_xattr_bucket *target,
4288 u64 new_blk,
4289 u32 prev_clusters,
4290 u32 *v_start,
4291 int *extend)
4292 {
4293 int ret;
4294
4295 mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n",
4296 (unsigned long long)bucket_blkno(first), prev_clusters,
4297 (unsigned long long)new_blk);
4298
4299 if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1) {
4300 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
4301 handle,
4302 first, target,
4303 new_blk,
4304 prev_clusters,
4305 v_start);
4306 if (ret)
4307 mlog_errno(ret);
4308 } else {
4309 /* The start of the last cluster in the first extent */
4310 u64 last_blk = bucket_blkno(first) +
4311 ((prev_clusters - 1) *
4312 ocfs2_clusters_to_blocks(inode->i_sb, 1));
4313
4314 if (prev_clusters > 1 && bucket_blkno(target) != last_blk) {
4315 ret = ocfs2_mv_xattr_buckets(inode, handle,
4316 bucket_blkno(first),
4317 last_blk, new_blk, 0,
4318 v_start);
4319 if (ret)
4320 mlog_errno(ret);
4321 } else {
4322 ret = ocfs2_divide_xattr_cluster(inode, handle,
4323 last_blk, new_blk,
4324 v_start);
4325 if (ret)
4326 mlog_errno(ret);
4327
4328 if ((bucket_blkno(target) == last_blk) && extend)
4329 *extend = 0;
4330 }
4331 }
4332
4333 return ret;
4334 }
4335
4336 /*
4337 * Add a new cluster for xattr storage.
4338 *
4339 * If the new cluster is contiguous with the previous one, it will be
4340 * appended to the same extent record, and num_clusters will be updated.
4341 * If not, we will insert a new extent for it and move some xattrs in
4342 * the last cluster into the new allocated one.
4343 * We also need to limit the maximum size of a btree leaf, otherwise we'll
4344 * lose the benefits of hashing because we'll have to search large leaves.
4345 * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
4346 * if it's bigger).
4347 *
4348 * first_bh is the first block of the previous extent rec and header_bh
4349 * indicates the bucket we will insert the new xattrs. They will be updated
4350 * when the header_bh is moved into the new cluster.
4351 */
4352 static int ocfs2_add_new_xattr_cluster(struct inode *inode,
4353 struct buffer_head *root_bh,
4354 struct ocfs2_xattr_bucket *first,
4355 struct ocfs2_xattr_bucket *target,
4356 u32 *num_clusters,
4357 u32 prev_cpos,
4358 int *extend,
4359 struct ocfs2_xattr_set_ctxt *ctxt)
4360 {
4361 int ret;
4362 u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
4363 u32 prev_clusters = *num_clusters;
4364 u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
4365 u64 block;
4366 handle_t *handle = ctxt->handle;
4367 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4368 struct ocfs2_extent_tree et;
4369
4370 mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, "
4371 "previous xattr blkno = %llu\n",
4372 (unsigned long long)OCFS2_I(inode)->ip_blkno,
4373 prev_cpos, (unsigned long long)bucket_blkno(first));
4374
4375 ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
4376
4377 ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
4378 OCFS2_JOURNAL_ACCESS_WRITE);
4379 if (ret < 0) {
4380 mlog_errno(ret);
4381 goto leave;
4382 }
4383
4384 ret = __ocfs2_claim_clusters(osb, handle, ctxt->data_ac, 1,
4385 clusters_to_add, &bit_off, &num_bits);
4386 if (ret < 0) {
4387 if (ret != -ENOSPC)
4388 mlog_errno(ret);
4389 goto leave;
4390 }
4391
4392 BUG_ON(num_bits > clusters_to_add);
4393
4394 block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
4395 mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n",
4396 num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
4397
4398 if (bucket_blkno(first) + (prev_clusters * bpc) == block &&
4399 (prev_clusters + num_bits) << osb->s_clustersize_bits <=
4400 OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
4401 /*
4402 * If this cluster is contiguous with the old one and
4403 * adding this new cluster, we don't surpass the limit of
4404 * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
4405 * initialized and used like other buckets in the previous
4406 * cluster.
4407 * So add it as a contiguous one. The caller will handle
4408 * its init process.
4409 */
4410 v_start = prev_cpos + prev_clusters;
4411 *num_clusters = prev_clusters + num_bits;
4412 mlog(0, "Add contiguous %u clusters to previous extent rec.\n",
4413 num_bits);
4414 } else {
4415 ret = ocfs2_adjust_xattr_cross_cluster(inode,
4416 handle,
4417 first,
4418 target,
4419 block,
4420 prev_clusters,
4421 &v_start,
4422 extend);
4423 if (ret) {
4424 mlog_errno(ret);
4425 goto leave;
4426 }
4427 }
4428
4429 mlog(0, "Insert %u clusters at block %llu for xattr at %u\n",
4430 num_bits, (unsigned long long)block, v_start);
4431 ret = ocfs2_insert_extent(handle, &et, v_start, block,
4432 num_bits, 0, ctxt->meta_ac);
4433 if (ret < 0) {
4434 mlog_errno(ret);
4435 goto leave;
4436 }
4437
4438 ret = ocfs2_journal_dirty(handle, root_bh);
4439 if (ret < 0)
4440 mlog_errno(ret);
4441
4442 leave:
4443 return ret;
4444 }
4445
4446 /*
4447 * We are given an extent. 'first' is the bucket at the very front of
4448 * the extent. The extent has space for an additional bucket past
4449 * bucket_xh(first)->xh_num_buckets. 'target_blkno' is the block number
4450 * of the target bucket. We wish to shift every bucket past the target
4451 * down one, filling in that additional space. When we get back to the
4452 * target, we split the target between itself and the now-empty bucket
4453 * at target+1 (aka, target_blkno + blks_per_bucket).
4454 */
4455 static int ocfs2_extend_xattr_bucket(struct inode *inode,
4456 handle_t *handle,
4457 struct ocfs2_xattr_bucket *first,
4458 u64 target_blk,
4459 u32 num_clusters)
4460 {
4461 int ret, credits;
4462 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4463 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4464 u64 end_blk;
4465 u16 new_bucket = le16_to_cpu(bucket_xh(first)->xh_num_buckets);
4466
4467 mlog(0, "extend xattr bucket in %llu, xattr extend rec starting "
4468 "from %llu, len = %u\n", (unsigned long long)target_blk,
4469 (unsigned long long)bucket_blkno(first), num_clusters);
4470
4471 /* The extent must have room for an additional bucket */
4472 BUG_ON(new_bucket >=
4473 (num_clusters * ocfs2_xattr_buckets_per_cluster(osb)));
4474
4475 /* end_blk points to the last existing bucket */
4476 end_blk = bucket_blkno(first) + ((new_bucket - 1) * blk_per_bucket);
4477
4478 /*
4479 * end_blk is the start of the last existing bucket.
4480 * Thus, (end_blk - target_blk) covers the target bucket and
4481 * every bucket after it up to, but not including, the last
4482 * existing bucket. Then we add the last existing bucket, the
4483 * new bucket, and the first bucket (3 * blk_per_bucket).
4484 */
4485 credits = (end_blk - target_blk) + (3 * blk_per_bucket) +
4486 handle->h_buffer_credits;
4487 ret = ocfs2_extend_trans(handle, credits);
4488 if (ret) {
4489 mlog_errno(ret);
4490 goto out;
4491 }
4492
4493 ret = ocfs2_xattr_bucket_journal_access(handle, first,
4494 OCFS2_JOURNAL_ACCESS_WRITE);
4495 if (ret) {
4496 mlog_errno(ret);
4497 goto out;
4498 }
4499
4500 while (end_blk != target_blk) {
4501 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
4502 end_blk + blk_per_bucket, 0);
4503 if (ret)
4504 goto out;
4505 end_blk -= blk_per_bucket;
4506 }
4507
4508 /* Move half of the xattr in target_blkno to the next bucket. */
4509 ret = ocfs2_divide_xattr_bucket(inode, handle, target_blk,
4510 target_blk + blk_per_bucket, NULL, 0);
4511
4512 le16_add_cpu(&bucket_xh(first)->xh_num_buckets, 1);
4513 ocfs2_xattr_bucket_journal_dirty(handle, first);
4514
4515 out:
4516 return ret;
4517 }
4518
4519 /*
4520 * Add new xattr bucket in an extent record and adjust the buckets
4521 * accordingly. xb_bh is the ocfs2_xattr_block, and target is the
4522 * bucket we want to insert into.
4523 *
4524 * In the easy case, we will move all the buckets after target down by
4525 * one. Half of target's xattrs will be moved to the next bucket.
4526 *
4527 * If current cluster is full, we'll allocate a new one. This may not
4528 * be contiguous. The underlying calls will make sure that there is
4529 * space for the insert, shifting buckets around if necessary.
4530 * 'target' may be moved by those calls.
4531 */
4532 static int ocfs2_add_new_xattr_bucket(struct inode *inode,
4533 struct buffer_head *xb_bh,
4534 struct ocfs2_xattr_bucket *target,
4535 struct ocfs2_xattr_set_ctxt *ctxt)
4536 {
4537 struct ocfs2_xattr_block *xb =
4538 (struct ocfs2_xattr_block *)xb_bh->b_data;
4539 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
4540 struct ocfs2_extent_list *el = &xb_root->xt_list;
4541 u32 name_hash =
4542 le32_to_cpu(bucket_xh(target)->xh_entries[0].xe_name_hash);
4543 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4544 int ret, num_buckets, extend = 1;
4545 u64 p_blkno;
4546 u32 e_cpos, num_clusters;
4547 /* The bucket at the front of the extent */
4548 struct ocfs2_xattr_bucket *first;
4549
4550 mlog(0, "Add new xattr bucket starting from %llu\n",
4551 (unsigned long long)bucket_blkno(target));
4552
4553 /* The first bucket of the original extent */
4554 first = ocfs2_xattr_bucket_new(inode);
4555 if (!first) {
4556 ret = -ENOMEM;
4557 mlog_errno(ret);
4558 goto out;
4559 }
4560
4561 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
4562 &num_clusters, el);
4563 if (ret) {
4564 mlog_errno(ret);
4565 goto out;
4566 }
4567
4568 ret = ocfs2_read_xattr_bucket(first, p_blkno);
4569 if (ret) {
4570 mlog_errno(ret);
4571 goto out;
4572 }
4573
4574 num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
4575 if (num_buckets == le16_to_cpu(bucket_xh(first)->xh_num_buckets)) {
4576 /*
4577 * This can move first+target if the target bucket moves
4578 * to the new extent.
4579 */
4580 ret = ocfs2_add_new_xattr_cluster(inode,
4581 xb_bh,
4582 first,
4583 target,
4584 &num_clusters,
4585 e_cpos,
4586 &extend,
4587 ctxt);
4588 if (ret) {
4589 mlog_errno(ret);
4590 goto out;
4591 }
4592 }
4593
4594 if (extend) {
4595 ret = ocfs2_extend_xattr_bucket(inode,
4596 ctxt->handle,
4597 first,
4598 bucket_blkno(target),
4599 num_clusters);
4600 if (ret)
4601 mlog_errno(ret);
4602 }
4603
4604 out:
4605 ocfs2_xattr_bucket_free(first);
4606
4607 return ret;
4608 }
4609
4610 static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode,
4611 struct ocfs2_xattr_bucket *bucket,
4612 int offs)
4613 {
4614 int block_off = offs >> inode->i_sb->s_blocksize_bits;
4615
4616 offs = offs % inode->i_sb->s_blocksize;
4617 return bucket_block(bucket, block_off) + offs;
4618 }
4619
4620 /*
4621 * Handle the normal xattr set, including replace, delete and new.
4622 *
4623 * Note: "local" indicates the real data's locality. So we can't
4624 * just its bucket locality by its length.
4625 */
4626 static void ocfs2_xattr_set_entry_normal(struct inode *inode,
4627 struct ocfs2_xattr_info *xi,
4628 struct ocfs2_xattr_search *xs,
4629 u32 name_hash,
4630 int local)
4631 {
4632 struct ocfs2_xattr_entry *last, *xe;
4633 int name_len = strlen(xi->name);
4634 struct ocfs2_xattr_header *xh = xs->header;
4635 u16 count = le16_to_cpu(xh->xh_count), start;
4636 size_t blocksize = inode->i_sb->s_blocksize;
4637 char *val;
4638 size_t offs, size, new_size;
4639
4640 last = &xh->xh_entries[count];
4641 if (!xs->not_found) {
4642 xe = xs->here;
4643 offs = le16_to_cpu(xe->xe_name_offset);
4644 if (ocfs2_xattr_is_local(xe))
4645 size = OCFS2_XATTR_SIZE(name_len) +
4646 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
4647 else
4648 size = OCFS2_XATTR_SIZE(name_len) +
4649 OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
4650
4651 /*
4652 * If the new value will be stored outside, xi->value has been
4653 * initalized as an empty ocfs2_xattr_value_root, and the same
4654 * goes with xi->value_len, so we can set new_size safely here.
4655 * See ocfs2_xattr_set_in_bucket.
4656 */
4657 new_size = OCFS2_XATTR_SIZE(name_len) +
4658 OCFS2_XATTR_SIZE(xi->value_len);
4659
4660 le16_add_cpu(&xh->xh_name_value_len, -size);
4661 if (xi->value) {
4662 if (new_size > size)
4663 goto set_new_name_value;
4664
4665 /* Now replace the old value with new one. */
4666 if (local)
4667 xe->xe_value_size = cpu_to_le64(xi->value_len);
4668 else
4669 xe->xe_value_size = 0;
4670
4671 val = ocfs2_xattr_bucket_get_val(inode,
4672 xs->bucket, offs);
4673 memset(val + OCFS2_XATTR_SIZE(name_len), 0,
4674 size - OCFS2_XATTR_SIZE(name_len));
4675 if (OCFS2_XATTR_SIZE(xi->value_len) > 0)
4676 memcpy(val + OCFS2_XATTR_SIZE(name_len),
4677 xi->value, xi->value_len);
4678
4679 le16_add_cpu(&xh->xh_name_value_len, new_size);
4680 ocfs2_xattr_set_local(xe, local);
4681 return;
4682 } else {
4683 /*
4684 * Remove the old entry if there is more than one.
4685 * We don't remove the last entry so that we can
4686 * use it to indicate the hash value of the empty
4687 * bucket.
4688 */
4689 last -= 1;
4690 le16_add_cpu(&xh->xh_count, -1);
4691 if (xh->xh_count) {
4692 memmove(xe, xe + 1,
4693 (void *)last - (void *)xe);
4694 memset(last, 0,
4695 sizeof(struct ocfs2_xattr_entry));
4696 } else
4697 xh->xh_free_start =
4698 cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
4699
4700 return;
4701 }
4702 } else {
4703 /* find a new entry for insert. */
4704 int low = 0, high = count - 1, tmp;
4705 struct ocfs2_xattr_entry *tmp_xe;
4706
4707 while (low <= high && count) {
4708 tmp = (low + high) / 2;
4709 tmp_xe = &xh->xh_entries[tmp];
4710
4711 if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
4712 low = tmp + 1;
4713 else if (name_hash <
4714 le32_to_cpu(tmp_xe->xe_name_hash))
4715 high = tmp - 1;
4716 else {
4717 low = tmp;
4718 break;
4719 }
4720 }
4721
4722 xe = &xh->xh_entries[low];
4723 if (low != count)
4724 memmove(xe + 1, xe, (void *)last - (void *)xe);
4725
4726 le16_add_cpu(&xh->xh_count, 1);
4727 memset(xe, 0, sizeof(struct ocfs2_xattr_entry));
4728 xe->xe_name_hash = cpu_to_le32(name_hash);
4729 xe->xe_name_len = name_len;
4730 ocfs2_xattr_set_type(xe, xi->name_index);
4731 }
4732
4733 set_new_name_value:
4734 /* Insert the new name+value. */
4735 size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len);
4736
4737 /*
4738 * We must make sure that the name/value pair
4739 * exists in the same block.
4740 */
4741 offs = le16_to_cpu(xh->xh_free_start);
4742 start = offs - size;
4743
4744 if (start >> inode->i_sb->s_blocksize_bits !=
4745 (offs - 1) >> inode->i_sb->s_blocksize_bits) {
4746 offs = offs - offs % blocksize;
4747 xh->xh_free_start = cpu_to_le16(offs);
4748 }
4749
4750 val = ocfs2_xattr_bucket_get_val(inode, xs->bucket, offs - size);
4751 xe->xe_name_offset = cpu_to_le16(offs - size);
4752
4753 memset(val, 0, size);
4754 memcpy(val, xi->name, name_len);
4755 memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len);
4756
4757 xe->xe_value_size = cpu_to_le64(xi->value_len);
4758 ocfs2_xattr_set_local(xe, local);
4759 xs->here = xe;
4760 le16_add_cpu(&xh->xh_free_start, -size);
4761 le16_add_cpu(&xh->xh_name_value_len, size);
4762
4763 return;
4764 }
4765
4766 /*
4767 * Set the xattr entry in the specified bucket.
4768 * The bucket is indicated by xs->bucket and it should have the enough
4769 * space for the xattr insertion.
4770 */
4771 static int ocfs2_xattr_set_entry_in_bucket(struct inode *inode,
4772 handle_t *handle,
4773 struct ocfs2_xattr_info *xi,
4774 struct ocfs2_xattr_search *xs,
4775 u32 name_hash,
4776 int local)
4777 {
4778 int ret;
4779 u64 blkno;
4780
4781 mlog(0, "Set xattr entry len = %lu index = %d in bucket %llu\n",
4782 (unsigned long)xi->value_len, xi->name_index,
4783 (unsigned long long)bucket_blkno(xs->bucket));
4784
4785 if (!xs->bucket->bu_bhs[1]) {
4786 blkno = bucket_blkno(xs->bucket);
4787 ocfs2_xattr_bucket_relse(xs->bucket);
4788 ret = ocfs2_read_xattr_bucket(xs->bucket, blkno);
4789 if (ret) {
4790 mlog_errno(ret);
4791 goto out;
4792 }
4793 }
4794
4795 ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
4796 OCFS2_JOURNAL_ACCESS_WRITE);
4797 if (ret < 0) {
4798 mlog_errno(ret);
4799 goto out;
4800 }
4801
4802 ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash, local);
4803 ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
4804
4805 out:
4806 return ret;
4807 }
4808
4809 /*
4810 * Truncate the specified xe_off entry in xattr bucket.
4811 * bucket is indicated by header_bh and len is the new length.
4812 * Both the ocfs2_xattr_value_root and the entry will be updated here.
4813 *
4814 * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
4815 */
4816 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
4817 struct ocfs2_xattr_bucket *bucket,
4818 int xe_off,
4819 int len,
4820 struct ocfs2_xattr_set_ctxt *ctxt)
4821 {
4822 int ret, offset;
4823 u64 value_blk;
4824 struct ocfs2_xattr_entry *xe;
4825 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
4826 size_t blocksize = inode->i_sb->s_blocksize;
4827 struct ocfs2_xattr_value_buf vb = {
4828 .vb_access = ocfs2_journal_access,
4829 };
4830
4831 xe = &xh->xh_entries[xe_off];
4832
4833 BUG_ON(!xe || ocfs2_xattr_is_local(xe));
4834
4835 offset = le16_to_cpu(xe->xe_name_offset) +
4836 OCFS2_XATTR_SIZE(xe->xe_name_len);
4837
4838 value_blk = offset / blocksize;
4839
4840 /* We don't allow ocfs2_xattr_value to be stored in different block. */
4841 BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
4842
4843 vb.vb_bh = bucket->bu_bhs[value_blk];
4844 BUG_ON(!vb.vb_bh);
4845
4846 vb.vb_xv = (struct ocfs2_xattr_value_root *)
4847 (vb.vb_bh->b_data + offset % blocksize);
4848
4849 /*
4850 * From here on out we have to dirty the bucket. The generic
4851 * value calls only modify one of the bucket's bhs, but we need
4852 * to send the bucket at once. So if they error, they *could* have
4853 * modified something. We have to assume they did, and dirty
4854 * the whole bucket. This leaves us in a consistent state.
4855 */
4856 mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n",
4857 xe_off, (unsigned long long)bucket_blkno(bucket), len);
4858 ret = ocfs2_xattr_value_truncate(inode, &vb, len, ctxt);
4859 if (ret) {
4860 mlog_errno(ret);
4861 goto out;
4862 }
4863
4864 ret = ocfs2_xattr_bucket_journal_access(ctxt->handle, bucket,
4865 OCFS2_JOURNAL_ACCESS_WRITE);
4866 if (ret) {
4867 mlog_errno(ret);
4868 goto out;
4869 }
4870
4871 xe->xe_value_size = cpu_to_le64(len);
4872
4873 ocfs2_xattr_bucket_journal_dirty(ctxt->handle, bucket);
4874
4875 out:
4876 return ret;
4877 }
4878
4879 static int ocfs2_xattr_bucket_value_truncate_xs(struct inode *inode,
4880 struct ocfs2_xattr_search *xs,
4881 int len,
4882 struct ocfs2_xattr_set_ctxt *ctxt)
4883 {
4884 int ret, offset;
4885 struct ocfs2_xattr_entry *xe = xs->here;
4886 struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xs->base;
4887
4888 BUG_ON(!xs->bucket->bu_bhs[0] || !xe || ocfs2_xattr_is_local(xe));
4889
4890 offset = xe - xh->xh_entries;
4891 ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket,
4892 offset, len, ctxt);
4893 if (ret)
4894 mlog_errno(ret);
4895
4896 return ret;
4897 }
4898
4899 static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode,
4900 handle_t *handle,
4901 struct ocfs2_xattr_search *xs,
4902 char *val,
4903 int value_len)
4904 {
4905 int ret, offset, block_off;
4906 struct ocfs2_xattr_value_root *xv;
4907 struct ocfs2_xattr_entry *xe = xs->here;
4908 struct ocfs2_xattr_header *xh = bucket_xh(xs->bucket);
4909 void *base;
4910 struct ocfs2_xattr_value_buf vb = {
4911 .vb_access = ocfs2_journal_access,
4912 };
4913
4914 BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe));
4915
4916 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb, xh,
4917 xe - xh->xh_entries,
4918 &block_off,
4919 &offset);
4920 if (ret) {
4921 mlog_errno(ret);
4922 goto out;
4923 }
4924
4925 base = bucket_block(xs->bucket, block_off);
4926 xv = (struct ocfs2_xattr_value_root *)(base + offset +
4927 OCFS2_XATTR_SIZE(xe->xe_name_len));
4928
4929 vb.vb_xv = xv;
4930 vb.vb_bh = xs->bucket->bu_bhs[block_off];
4931 ret = __ocfs2_xattr_set_value_outside(inode, handle,
4932 &vb, val, value_len);
4933 if (ret)
4934 mlog_errno(ret);
4935 out:
4936 return ret;
4937 }
4938
4939 static int ocfs2_rm_xattr_cluster(struct inode *inode,
4940 struct buffer_head *root_bh,
4941 u64 blkno,
4942 u32 cpos,
4943 u32 len,
4944 void *para)
4945 {
4946 int ret;
4947 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4948 struct inode *tl_inode = osb->osb_tl_inode;
4949 handle_t *handle;
4950 struct ocfs2_xattr_block *xb =
4951 (struct ocfs2_xattr_block *)root_bh->b_data;
4952 struct ocfs2_alloc_context *meta_ac = NULL;
4953 struct ocfs2_cached_dealloc_ctxt dealloc;
4954 struct ocfs2_extent_tree et;
4955
4956 ret = ocfs2_iterate_xattr_buckets(inode, blkno, len,
4957 ocfs2_delete_xattr_in_bucket, NULL);
4958 if (ret) {
4959 mlog_errno(ret);
4960 return ret;
4961 }
4962
4963 ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
4964
4965 ocfs2_init_dealloc_ctxt(&dealloc);
4966
4967 mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n",
4968 cpos, len, (unsigned long long)blkno);
4969
4970 ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode), blkno,
4971 len);
4972
4973 ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
4974 if (ret) {
4975 mlog_errno(ret);
4976 return ret;
4977 }
4978
4979 mutex_lock(&tl_inode->i_mutex);
4980
4981 if (ocfs2_truncate_log_needs_flush(osb)) {
4982 ret = __ocfs2_flush_truncate_log(osb);
4983 if (ret < 0) {
4984 mlog_errno(ret);
4985 goto out;
4986 }
4987 }
4988
4989 handle = ocfs2_start_trans(osb, ocfs2_remove_extent_credits(osb->sb));
4990 if (IS_ERR(handle)) {
4991 ret = -ENOMEM;
4992 mlog_errno(ret);
4993 goto out;
4994 }
4995
4996 ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
4997 OCFS2_JOURNAL_ACCESS_WRITE);
4998 if (ret) {
4999 mlog_errno(ret);
5000 goto out_commit;
5001 }
5002
5003 ret = ocfs2_remove_extent(handle, &et, cpos, len, meta_ac,
5004 &dealloc);
5005 if (ret) {
5006 mlog_errno(ret);
5007 goto out_commit;
5008 }
5009
5010 le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
5011
5012 ret = ocfs2_journal_dirty(handle, root_bh);
5013 if (ret) {
5014 mlog_errno(ret);
5015 goto out_commit;
5016 }
5017
5018 ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
5019 if (ret)
5020 mlog_errno(ret);
5021
5022 out_commit:
5023 ocfs2_commit_trans(osb, handle);
5024 out:
5025 ocfs2_schedule_truncate_log_flush(osb, 1);
5026
5027 mutex_unlock(&tl_inode->i_mutex);
5028
5029 if (meta_ac)
5030 ocfs2_free_alloc_context(meta_ac);
5031
5032 ocfs2_run_deallocs(osb, &dealloc);
5033
5034 return ret;
5035 }
5036
5037 static void ocfs2_xattr_bucket_remove_xs(struct inode *inode,
5038 handle_t *handle,
5039 struct ocfs2_xattr_search *xs)
5040 {
5041 struct ocfs2_xattr_header *xh = bucket_xh(xs->bucket);
5042 struct ocfs2_xattr_entry *last = &xh->xh_entries[
5043 le16_to_cpu(xh->xh_count) - 1];
5044 int ret = 0;
5045
5046 ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
5047 OCFS2_JOURNAL_ACCESS_WRITE);
5048 if (ret) {
5049 mlog_errno(ret);
5050 return;
5051 }
5052
5053 /* Remove the old entry. */
5054 memmove(xs->here, xs->here + 1,
5055 (void *)last - (void *)xs->here);
5056 memset(last, 0, sizeof(struct ocfs2_xattr_entry));
5057 le16_add_cpu(&xh->xh_count, -1);
5058
5059 ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
5060 }
5061
5062 /*
5063 * Set the xattr name/value in the bucket specified in xs.
5064 *
5065 * As the new value in xi may be stored in the bucket or in an outside cluster,
5066 * we divide the whole process into 3 steps:
5067 * 1. insert name/value in the bucket(ocfs2_xattr_set_entry_in_bucket)
5068 * 2. truncate of the outside cluster(ocfs2_xattr_bucket_value_truncate_xs)
5069 * 3. Set the value to the outside cluster(ocfs2_xattr_bucket_set_value_outside)
5070 * 4. If the clusters for the new outside value can't be allocated, we need
5071 * to free the xattr we allocated in set.
5072 */
5073 static int ocfs2_xattr_set_in_bucket(struct inode *inode,
5074 struct ocfs2_xattr_info *xi,
5075 struct ocfs2_xattr_search *xs,
5076 struct ocfs2_xattr_set_ctxt *ctxt)
5077 {
5078 int ret, local = 1;
5079 size_t value_len;
5080 char *val = (char *)xi->value;
5081 struct ocfs2_xattr_entry *xe = xs->here;
5082 u32 name_hash = ocfs2_xattr_name_hash(inode, xi->name,
5083 strlen(xi->name));
5084
5085 if (!xs->not_found && !ocfs2_xattr_is_local(xe)) {
5086 /*
5087 * We need to truncate the xattr storage first.
5088 *
5089 * If both the old and new value are stored to
5090 * outside block, we only need to truncate
5091 * the storage and then set the value outside.
5092 *
5093 * If the new value should be stored within block,
5094 * we should free all the outside block first and
5095 * the modification to the xattr block will be done
5096 * by following steps.
5097 */
5098 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
5099 value_len = xi->value_len;
5100 else
5101 value_len = 0;
5102
5103 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
5104 value_len,
5105 ctxt);
5106 if (ret)
5107 goto out;
5108
5109 if (value_len)
5110 goto set_value_outside;
5111 }
5112
5113 value_len = xi->value_len;
5114 /* So we have to handle the inside block change now. */
5115 if (value_len > OCFS2_XATTR_INLINE_SIZE) {
5116 /*
5117 * If the new value will be stored outside of block,
5118 * initalize a new empty value root and insert it first.
5119 */
5120 local = 0;
5121 xi->value = &def_xv;
5122 xi->value_len = OCFS2_XATTR_ROOT_SIZE;
5123 }
5124
5125 ret = ocfs2_xattr_set_entry_in_bucket(inode, ctxt->handle, xi, xs,
5126 name_hash, local);
5127 if (ret) {
5128 mlog_errno(ret);
5129 goto out;
5130 }
5131
5132 if (value_len <= OCFS2_XATTR_INLINE_SIZE)
5133 goto out;
5134
5135 /* allocate the space now for the outside block storage. */
5136 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
5137 value_len, ctxt);
5138 if (ret) {
5139 mlog_errno(ret);
5140
5141 if (xs->not_found) {
5142 /*
5143 * We can't allocate enough clusters for outside
5144 * storage and we have allocated xattr already,
5145 * so need to remove it.
5146 */
5147 ocfs2_xattr_bucket_remove_xs(inode, ctxt->handle, xs);
5148 }
5149 goto out;
5150 }
5151
5152 set_value_outside:
5153 ret = ocfs2_xattr_bucket_set_value_outside(inode, ctxt->handle,
5154 xs, val, value_len);
5155 out:
5156 return ret;
5157 }
5158
5159 /*
5160 * check whether the xattr bucket is filled up with the same hash value.
5161 * If we want to insert the xattr with the same hash, return -ENOSPC.
5162 * If we want to insert a xattr with different hash value, go ahead
5163 * and ocfs2_divide_xattr_bucket will handle this.
5164 */
5165 static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
5166 struct ocfs2_xattr_bucket *bucket,
5167 const char *name)
5168 {
5169 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5170 u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
5171
5172 if (name_hash != le32_to_cpu(xh->xh_entries[0].xe_name_hash))
5173 return 0;
5174
5175 if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
5176 xh->xh_entries[0].xe_name_hash) {
5177 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
5178 "hash = %u\n",
5179 (unsigned long long)bucket_blkno(bucket),
5180 le32_to_cpu(xh->xh_entries[0].xe_name_hash));
5181 return -ENOSPC;
5182 }
5183
5184 return 0;
5185 }
5186
5187 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
5188 struct ocfs2_xattr_info *xi,
5189 struct ocfs2_xattr_search *xs,
5190 struct ocfs2_xattr_set_ctxt *ctxt)
5191 {
5192 struct ocfs2_xattr_header *xh;
5193 struct ocfs2_xattr_entry *xe;
5194 u16 count, header_size, xh_free_start;
5195 int free, max_free, need, old;
5196 size_t value_size = 0, name_len = strlen(xi->name);
5197 size_t blocksize = inode->i_sb->s_blocksize;
5198 int ret, allocation = 0;
5199
5200 mlog_entry("Set xattr %s in xattr index block\n", xi->name);
5201
5202 try_again:
5203 xh = xs->header;
5204 count = le16_to_cpu(xh->xh_count);
5205 xh_free_start = le16_to_cpu(xh->xh_free_start);
5206 header_size = sizeof(struct ocfs2_xattr_header) +
5207 count * sizeof(struct ocfs2_xattr_entry);
5208 max_free = OCFS2_XATTR_BUCKET_SIZE - header_size -
5209 le16_to_cpu(xh->xh_name_value_len) - OCFS2_XATTR_HEADER_GAP;
5210
5211 mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size "
5212 "of %u which exceed block size\n",
5213 (unsigned long long)bucket_blkno(xs->bucket),
5214 header_size);
5215
5216 if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE)
5217 value_size = OCFS2_XATTR_ROOT_SIZE;
5218 else if (xi->value)
5219 value_size = OCFS2_XATTR_SIZE(xi->value_len);
5220
5221 if (xs->not_found)
5222 need = sizeof(struct ocfs2_xattr_entry) +
5223 OCFS2_XATTR_SIZE(name_len) + value_size;
5224 else {
5225 need = value_size + OCFS2_XATTR_SIZE(name_len);
5226
5227 /*
5228 * We only replace the old value if the new length is smaller
5229 * than the old one. Otherwise we will allocate new space in the
5230 * bucket to store it.
5231 */
5232 xe = xs->here;
5233 if (ocfs2_xattr_is_local(xe))
5234 old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
5235 else
5236 old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
5237
5238 if (old >= value_size)
5239 need = 0;
5240 }
5241
5242 free = xh_free_start - header_size - OCFS2_XATTR_HEADER_GAP;
5243 /*
5244 * We need to make sure the new name/value pair
5245 * can exist in the same block.
5246 */
5247 if (xh_free_start % blocksize < need)
5248 free -= xh_free_start % blocksize;
5249
5250 mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, "
5251 "need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len ="
5252 " %u\n", xs->not_found,
5253 (unsigned long long)bucket_blkno(xs->bucket),
5254 free, need, max_free, le16_to_cpu(xh->xh_free_start),
5255 le16_to_cpu(xh->xh_name_value_len));
5256
5257 if (free < need ||
5258 (xs->not_found &&
5259 count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb))) {
5260 if (need <= max_free &&
5261 count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
5262 /*
5263 * We can create the space by defragment. Since only the
5264 * name/value will be moved, the xe shouldn't be changed
5265 * in xs.
5266 */
5267 ret = ocfs2_defrag_xattr_bucket(inode, ctxt->handle,
5268 xs->bucket);
5269 if (ret) {
5270 mlog_errno(ret);
5271 goto out;
5272 }
5273
5274 xh_free_start = le16_to_cpu(xh->xh_free_start);
5275 free = xh_free_start - header_size
5276 - OCFS2_XATTR_HEADER_GAP;
5277 if (xh_free_start % blocksize < need)
5278 free -= xh_free_start % blocksize;
5279
5280 if (free >= need)
5281 goto xattr_set;
5282
5283 mlog(0, "Can't get enough space for xattr insert by "
5284 "defragment. Need %u bytes, but we have %d, so "
5285 "allocate new bucket for it.\n", need, free);
5286 }
5287
5288 /*
5289 * We have to add new buckets or clusters and one
5290 * allocation should leave us enough space for insert.
5291 */
5292 BUG_ON(allocation);
5293
5294 /*
5295 * We do not allow for overlapping ranges between buckets. And
5296 * the maximum number of collisions we will allow for then is
5297 * one bucket's worth, so check it here whether we need to
5298 * add a new bucket for the insert.
5299 */
5300 ret = ocfs2_check_xattr_bucket_collision(inode,
5301 xs->bucket,
5302 xi->name);
5303 if (ret) {
5304 mlog_errno(ret);
5305 goto out;
5306 }
5307
5308 ret = ocfs2_add_new_xattr_bucket(inode,
5309 xs->xattr_bh,
5310 xs->bucket,
5311 ctxt);
5312 if (ret) {
5313 mlog_errno(ret);
5314 goto out;
5315 }
5316
5317 /*
5318 * ocfs2_add_new_xattr_bucket() will have updated
5319 * xs->bucket if it moved, but it will not have updated
5320 * any of the other search fields. Thus, we drop it and
5321 * re-search. Everything should be cached, so it'll be
5322 * quick.
5323 */
5324 ocfs2_xattr_bucket_relse(xs->bucket);
5325 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
5326 xi->name_index,
5327 xi->name, xs);
5328 if (ret && ret != -ENODATA)
5329 goto out;
5330 xs->not_found = ret;
5331 allocation = 1;
5332 goto try_again;
5333 }
5334
5335 xattr_set:
5336 ret = ocfs2_xattr_set_in_bucket(inode, xi, xs, ctxt);
5337 out:
5338 mlog_exit(ret);
5339 return ret;
5340 }
5341
5342 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
5343 struct ocfs2_xattr_bucket *bucket,
5344 void *para)
5345 {
5346 int ret = 0;
5347 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5348 u16 i;
5349 struct ocfs2_xattr_entry *xe;
5350 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5351 struct ocfs2_xattr_set_ctxt ctxt = {NULL, NULL,};
5352 int credits = ocfs2_remove_extent_credits(osb->sb) +
5353 ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5354
5355
5356 ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
5357
5358 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
5359 xe = &xh->xh_entries[i];
5360 if (ocfs2_xattr_is_local(xe))
5361 continue;
5362
5363 ctxt.handle = ocfs2_start_trans(osb, credits);
5364 if (IS_ERR(ctxt.handle)) {
5365 ret = PTR_ERR(ctxt.handle);
5366 mlog_errno(ret);
5367 break;
5368 }
5369
5370 ret = ocfs2_xattr_bucket_value_truncate(inode, bucket,
5371 i, 0, &ctxt);
5372
5373 ocfs2_commit_trans(osb, ctxt.handle);
5374 if (ret) {
5375 mlog_errno(ret);
5376 break;
5377 }
5378 }
5379
5380 ocfs2_schedule_truncate_log_flush(osb, 1);
5381 ocfs2_run_deallocs(osb, &ctxt.dealloc);
5382 return ret;
5383 }
5384
5385 /*
5386 * Whenever we modify a xattr value root in the bucket(e.g, CoW
5387 * or change the extent record flag), we need to recalculate
5388 * the metaecc for the whole bucket. So it is done here.
5389 *
5390 * Note:
5391 * We have to give the extra credits for the caller.
5392 */
5393 static int ocfs2_xattr_bucket_post_refcount(struct inode *inode,
5394 handle_t *handle,
5395 void *para)
5396 {
5397 int ret;
5398 struct ocfs2_xattr_bucket *bucket =
5399 (struct ocfs2_xattr_bucket *)para;
5400
5401 ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
5402 OCFS2_JOURNAL_ACCESS_WRITE);
5403 if (ret) {
5404 mlog_errno(ret);
5405 return ret;
5406 }
5407
5408 ocfs2_xattr_bucket_journal_dirty(handle, bucket);
5409
5410 return 0;
5411 }
5412
5413 /*
5414 * Special action we need if the xattr value is refcounted.
5415 *
5416 * 1. If the xattr is refcounted, lock the tree.
5417 * 2. CoW the xattr if we are setting the new value and the value
5418 * will be stored outside.
5419 * 3. In other case, decrease_refcount will work for us, so just
5420 * lock the refcount tree, calculate the meta and credits is OK.
5421 *
5422 * We have to do CoW before ocfs2_init_xattr_set_ctxt since
5423 * currently CoW is a completed transaction, while this function
5424 * will also lock the allocators and let us deadlock. So we will
5425 * CoW the whole xattr value.
5426 */
5427 static int ocfs2_prepare_refcount_xattr(struct inode *inode,
5428 struct ocfs2_dinode *di,
5429 struct ocfs2_xattr_info *xi,
5430 struct ocfs2_xattr_search *xis,
5431 struct ocfs2_xattr_search *xbs,
5432 struct ocfs2_refcount_tree **ref_tree,
5433 int *meta_add,
5434 int *credits)
5435 {
5436 int ret = 0;
5437 struct ocfs2_xattr_block *xb;
5438 struct ocfs2_xattr_entry *xe;
5439 char *base;
5440 u32 p_cluster, num_clusters;
5441 unsigned int ext_flags;
5442 int name_offset, name_len;
5443 struct ocfs2_xattr_value_buf vb;
5444 struct ocfs2_xattr_bucket *bucket = NULL;
5445 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5446 struct ocfs2_post_refcount refcount;
5447 struct ocfs2_post_refcount *p = NULL;
5448 struct buffer_head *ref_root_bh = NULL;
5449
5450 if (!xis->not_found) {
5451 xe = xis->here;
5452 name_offset = le16_to_cpu(xe->xe_name_offset);
5453 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5454 base = xis->base;
5455 vb.vb_bh = xis->inode_bh;
5456 vb.vb_access = ocfs2_journal_access_di;
5457 } else {
5458 int i, block_off = 0;
5459 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
5460 xe = xbs->here;
5461 name_offset = le16_to_cpu(xe->xe_name_offset);
5462 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5463 i = xbs->here - xbs->header->xh_entries;
5464
5465 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
5466 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
5467 bucket_xh(xbs->bucket),
5468 i, &block_off,
5469 &name_offset);
5470 if (ret) {
5471 mlog_errno(ret);
5472 goto out;
5473 }
5474 base = bucket_block(xbs->bucket, block_off);
5475 vb.vb_bh = xbs->bucket->bu_bhs[block_off];
5476 vb.vb_access = ocfs2_journal_access;
5477
5478 if (ocfs2_meta_ecc(osb)) {
5479 /*create parameters for ocfs2_post_refcount. */
5480 bucket = xbs->bucket;
5481 refcount.credits = bucket->bu_blocks;
5482 refcount.para = bucket;
5483 refcount.func =
5484 ocfs2_xattr_bucket_post_refcount;
5485 p = &refcount;
5486 }
5487 } else {
5488 base = xbs->base;
5489 vb.vb_bh = xbs->xattr_bh;
5490 vb.vb_access = ocfs2_journal_access_xb;
5491 }
5492 }
5493
5494 if (ocfs2_xattr_is_local(xe))
5495 goto out;
5496
5497 vb.vb_xv = (struct ocfs2_xattr_value_root *)
5498 (base + name_offset + name_len);
5499
5500 ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
5501 &num_clusters, &vb.vb_xv->xr_list,
5502 &ext_flags);
5503 if (ret) {
5504 mlog_errno(ret);
5505 goto out;
5506 }
5507
5508 /*
5509 * We just need to check the 1st extent record, since we always
5510 * CoW the whole xattr. So there shouldn't be a xattr with
5511 * some REFCOUNT extent recs after the 1st one.
5512 */
5513 if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
5514 goto out;
5515
5516 ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
5517 1, ref_tree, &ref_root_bh);
5518 if (ret) {
5519 mlog_errno(ret);
5520 goto out;
5521 }
5522
5523 /*
5524 * If we are deleting the xattr or the new size will be stored inside,
5525 * cool, leave it there, the xattr truncate process will remove them
5526 * for us(it still needs the refcount tree lock and the meta, credits).
5527 * And the worse case is that every cluster truncate will split the
5528 * refcount tree, and make the original extent become 3. So we will need
5529 * 2 * cluster more extent recs at most.
5530 */
5531 if (!xi->value || xi->value_len <= OCFS2_XATTR_INLINE_SIZE) {
5532
5533 ret = ocfs2_refcounted_xattr_delete_need(inode,
5534 &(*ref_tree)->rf_ci,
5535 ref_root_bh, vb.vb_xv,
5536 meta_add, credits);
5537 if (ret)
5538 mlog_errno(ret);
5539 goto out;
5540 }
5541
5542 ret = ocfs2_refcount_cow_xattr(inode, di, &vb,
5543 *ref_tree, ref_root_bh, 0,
5544 le32_to_cpu(vb.vb_xv->xr_clusters), p);
5545 if (ret)
5546 mlog_errno(ret);
5547
5548 out:
5549 brelse(ref_root_bh);
5550 return ret;
5551 }
5552
5553 /*
5554 * Add the REFCOUNTED flags for all the extent rec in ocfs2_xattr_value_root.
5555 * The physical clusters will be added to refcount tree.
5556 */
5557 static int ocfs2_xattr_value_attach_refcount(struct inode *inode,
5558 struct ocfs2_xattr_value_root *xv,
5559 struct ocfs2_extent_tree *value_et,
5560 struct ocfs2_caching_info *ref_ci,
5561 struct buffer_head *ref_root_bh,
5562 struct ocfs2_cached_dealloc_ctxt *dealloc,
5563 struct ocfs2_post_refcount *refcount)
5564 {
5565 int ret = 0;
5566 u32 clusters = le32_to_cpu(xv->xr_clusters);
5567 u32 cpos, p_cluster, num_clusters;
5568 struct ocfs2_extent_list *el = &xv->xr_list;
5569 unsigned int ext_flags;
5570
5571 cpos = 0;
5572 while (cpos < clusters) {
5573 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
5574 &num_clusters, el, &ext_flags);
5575
5576 cpos += num_clusters;
5577 if ((ext_flags & OCFS2_EXT_REFCOUNTED))
5578 continue;
5579
5580 BUG_ON(!p_cluster);
5581
5582 ret = ocfs2_add_refcount_flag(inode, value_et,
5583 ref_ci, ref_root_bh,
5584 cpos - num_clusters,
5585 p_cluster, num_clusters,
5586 dealloc, refcount);
5587 if (ret) {
5588 mlog_errno(ret);
5589 break;
5590 }
5591 }
5592
5593 return ret;
5594 }
5595
5596 /*
5597 * Given a normal ocfs2_xattr_header, refcount all the entries which
5598 * have value stored outside.
5599 * Used for xattrs stored in inode and ocfs2_xattr_block.
5600 */
5601 static int ocfs2_xattr_attach_refcount_normal(struct inode *inode,
5602 struct ocfs2_xattr_value_buf *vb,
5603 struct ocfs2_xattr_header *header,
5604 struct ocfs2_caching_info *ref_ci,
5605 struct buffer_head *ref_root_bh,
5606 struct ocfs2_cached_dealloc_ctxt *dealloc)
5607 {
5608
5609 struct ocfs2_xattr_entry *xe;
5610 struct ocfs2_xattr_value_root *xv;
5611 struct ocfs2_extent_tree et;
5612 int i, ret = 0;
5613
5614 for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
5615 xe = &header->xh_entries[i];
5616
5617 if (ocfs2_xattr_is_local(xe))
5618 continue;
5619
5620 xv = (struct ocfs2_xattr_value_root *)((void *)header +
5621 le16_to_cpu(xe->xe_name_offset) +
5622 OCFS2_XATTR_SIZE(xe->xe_name_len));
5623
5624 vb->vb_xv = xv;
5625 ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
5626
5627 ret = ocfs2_xattr_value_attach_refcount(inode, xv, &et,
5628 ref_ci, ref_root_bh,
5629 dealloc, NULL);
5630 if (ret) {
5631 mlog_errno(ret);
5632 break;
5633 }
5634 }
5635
5636 return ret;
5637 }
5638
5639 static int ocfs2_xattr_inline_attach_refcount(struct inode *inode,
5640 struct buffer_head *fe_bh,
5641 struct ocfs2_caching_info *ref_ci,
5642 struct buffer_head *ref_root_bh,
5643 struct ocfs2_cached_dealloc_ctxt *dealloc)
5644 {
5645 struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
5646 struct ocfs2_xattr_header *header = (struct ocfs2_xattr_header *)
5647 (fe_bh->b_data + inode->i_sb->s_blocksize -
5648 le16_to_cpu(di->i_xattr_inline_size));
5649 struct ocfs2_xattr_value_buf vb = {
5650 .vb_bh = fe_bh,
5651 .vb_access = ocfs2_journal_access_di,
5652 };
5653
5654 return ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
5655 ref_ci, ref_root_bh, dealloc);
5656 }
5657
5658 struct ocfs2_xattr_tree_value_refcount_para {
5659 struct ocfs2_caching_info *ref_ci;
5660 struct buffer_head *ref_root_bh;
5661 struct ocfs2_cached_dealloc_ctxt *dealloc;
5662 };
5663
5664 static int ocfs2_get_xattr_tree_value_root(struct super_block *sb,
5665 struct ocfs2_xattr_bucket *bucket,
5666 int offset,
5667 struct ocfs2_xattr_value_root **xv,
5668 struct buffer_head **bh)
5669 {
5670 int ret, block_off, name_offset;
5671 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5672 struct ocfs2_xattr_entry *xe = &xh->xh_entries[offset];
5673 void *base;
5674
5675 ret = ocfs2_xattr_bucket_get_name_value(sb,
5676 bucket_xh(bucket),
5677 offset,
5678 &block_off,
5679 &name_offset);
5680 if (ret) {
5681 mlog_errno(ret);
5682 goto out;
5683 }
5684
5685 base = bucket_block(bucket, block_off);
5686
5687 *xv = (struct ocfs2_xattr_value_root *)(base + name_offset +
5688 OCFS2_XATTR_SIZE(xe->xe_name_len));
5689
5690 if (bh)
5691 *bh = bucket->bu_bhs[block_off];
5692 out:
5693 return ret;
5694 }
5695
5696 /*
5697 * For a given xattr bucket, refcount all the entries which
5698 * have value stored outside.
5699 */
5700 static int ocfs2_xattr_bucket_value_refcount(struct inode *inode,
5701 struct ocfs2_xattr_bucket *bucket,
5702 void *para)
5703 {
5704 int i, ret = 0;
5705 struct ocfs2_extent_tree et;
5706 struct ocfs2_xattr_tree_value_refcount_para *ref =
5707 (struct ocfs2_xattr_tree_value_refcount_para *)para;
5708 struct ocfs2_xattr_header *xh =
5709 (struct ocfs2_xattr_header *)bucket->bu_bhs[0]->b_data;
5710 struct ocfs2_xattr_entry *xe;
5711 struct ocfs2_xattr_value_buf vb = {
5712 .vb_access = ocfs2_journal_access,
5713 };
5714 struct ocfs2_post_refcount refcount = {
5715 .credits = bucket->bu_blocks,
5716 .para = bucket,
5717 .func = ocfs2_xattr_bucket_post_refcount,
5718 };
5719 struct ocfs2_post_refcount *p = NULL;
5720
5721 /* We only need post_refcount if we support metaecc. */
5722 if (ocfs2_meta_ecc(OCFS2_SB(inode->i_sb)))
5723 p = &refcount;
5724
5725 mlog(0, "refcount bucket %llu, count = %u\n",
5726 (unsigned long long)bucket_blkno(bucket),
5727 le16_to_cpu(xh->xh_count));
5728 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
5729 xe = &xh->xh_entries[i];
5730
5731 if (ocfs2_xattr_is_local(xe))
5732 continue;
5733
5734 ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket, i,
5735 &vb.vb_xv, &vb.vb_bh);
5736 if (ret) {
5737 mlog_errno(ret);
5738 break;
5739 }
5740
5741 ocfs2_init_xattr_value_extent_tree(&et,
5742 INODE_CACHE(inode), &vb);
5743
5744 ret = ocfs2_xattr_value_attach_refcount(inode, vb.vb_xv,
5745 &et, ref->ref_ci,
5746 ref->ref_root_bh,
5747 ref->dealloc, p);
5748 if (ret) {
5749 mlog_errno(ret);
5750 break;
5751 }
5752 }
5753
5754 return ret;
5755
5756 }
5757
5758 static int ocfs2_refcount_xattr_tree_rec(struct inode *inode,
5759 struct buffer_head *root_bh,
5760 u64 blkno, u32 cpos, u32 len, void *para)
5761 {
5762 return ocfs2_iterate_xattr_buckets(inode, blkno, len,
5763 ocfs2_xattr_bucket_value_refcount,
5764 para);
5765 }
5766
5767 static int ocfs2_xattr_block_attach_refcount(struct inode *inode,
5768 struct buffer_head *blk_bh,
5769 struct ocfs2_caching_info *ref_ci,
5770 struct buffer_head *ref_root_bh,
5771 struct ocfs2_cached_dealloc_ctxt *dealloc)
5772 {
5773 int ret = 0;
5774 struct ocfs2_xattr_block *xb =
5775 (struct ocfs2_xattr_block *)blk_bh->b_data;
5776
5777 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
5778 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
5779 struct ocfs2_xattr_value_buf vb = {
5780 .vb_bh = blk_bh,
5781 .vb_access = ocfs2_journal_access_xb,
5782 };
5783
5784 ret = ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
5785 ref_ci, ref_root_bh,
5786 dealloc);
5787 } else {
5788 struct ocfs2_xattr_tree_value_refcount_para para = {
5789 .ref_ci = ref_ci,
5790 .ref_root_bh = ref_root_bh,
5791 .dealloc = dealloc,
5792 };
5793
5794 ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
5795 ocfs2_refcount_xattr_tree_rec,
5796 &para);
5797 }
5798
5799 return ret;
5800 }
5801
5802 int ocfs2_xattr_attach_refcount_tree(struct inode *inode,
5803 struct buffer_head *fe_bh,
5804 struct ocfs2_caching_info *ref_ci,
5805 struct buffer_head *ref_root_bh,
5806 struct ocfs2_cached_dealloc_ctxt *dealloc)
5807 {
5808 int ret = 0;
5809 struct ocfs2_inode_info *oi = OCFS2_I(inode);
5810 struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
5811 struct buffer_head *blk_bh = NULL;
5812
5813 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
5814 ret = ocfs2_xattr_inline_attach_refcount(inode, fe_bh,
5815 ref_ci, ref_root_bh,
5816 dealloc);
5817 if (ret) {
5818 mlog_errno(ret);
5819 goto out;
5820 }
5821 }
5822
5823 if (!di->i_xattr_loc)
5824 goto out;
5825
5826 ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
5827 &blk_bh);
5828 if (ret < 0) {
5829 mlog_errno(ret);
5830 goto out;
5831 }
5832
5833 ret = ocfs2_xattr_block_attach_refcount(inode, blk_bh, ref_ci,
5834 ref_root_bh, dealloc);
5835 if (ret)
5836 mlog_errno(ret);
5837
5838 brelse(blk_bh);
5839 out:
5840
5841 return ret;
5842 }
5843
5844 /*
5845 * 'security' attributes support
5846 */
5847 static size_t ocfs2_xattr_security_list(struct inode *inode, char *list,
5848 size_t list_size, const char *name,
5849 size_t name_len)
5850 {
5851 const size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
5852 const size_t total_len = prefix_len + name_len + 1;
5853
5854 if (list && total_len <= list_size) {
5855 memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
5856 memcpy(list + prefix_len, name, name_len);
5857 list[prefix_len + name_len] = '\0';
5858 }
5859 return total_len;
5860 }
5861
5862 static int ocfs2_xattr_security_get(struct inode *inode, const char *name,
5863 void *buffer, size_t size)
5864 {
5865 if (strcmp(name, "") == 0)
5866 return -EINVAL;
5867 return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_SECURITY, name,
5868 buffer, size);
5869 }
5870
5871 static int ocfs2_xattr_security_set(struct inode *inode, const char *name,
5872 const void *value, size_t size, int flags)
5873 {
5874 if (strcmp(name, "") == 0)
5875 return -EINVAL;
5876
5877 return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_SECURITY, name, value,
5878 size, flags);
5879 }
5880
5881 int ocfs2_init_security_get(struct inode *inode,
5882 struct inode *dir,
5883 struct ocfs2_security_xattr_info *si)
5884 {
5885 /* check whether ocfs2 support feature xattr */
5886 if (!ocfs2_supports_xattr(OCFS2_SB(dir->i_sb)))
5887 return -EOPNOTSUPP;
5888 return security_inode_init_security(inode, dir, &si->name, &si->value,
5889 &si->value_len);
5890 }
5891
5892 int ocfs2_init_security_set(handle_t *handle,
5893 struct inode *inode,
5894 struct buffer_head *di_bh,
5895 struct ocfs2_security_xattr_info *si,
5896 struct ocfs2_alloc_context *xattr_ac,
5897 struct ocfs2_alloc_context *data_ac)
5898 {
5899 return ocfs2_xattr_set_handle(handle, inode, di_bh,
5900 OCFS2_XATTR_INDEX_SECURITY,
5901 si->name, si->value, si->value_len, 0,
5902 xattr_ac, data_ac);
5903 }
5904
5905 struct xattr_handler ocfs2_xattr_security_handler = {
5906 .prefix = XATTR_SECURITY_PREFIX,
5907 .list = ocfs2_xattr_security_list,
5908 .get = ocfs2_xattr_security_get,
5909 .set = ocfs2_xattr_security_set,
5910 };
5911
5912 /*
5913 * 'trusted' attributes support
5914 */
5915 static size_t ocfs2_xattr_trusted_list(struct inode *inode, char *list,
5916 size_t list_size, const char *name,
5917 size_t name_len)
5918 {
5919 const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
5920 const size_t total_len = prefix_len + name_len + 1;
5921
5922 if (list && total_len <= list_size) {
5923 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
5924 memcpy(list + prefix_len, name, name_len);
5925 list[prefix_len + name_len] = '\0';
5926 }
5927 return total_len;
5928 }
5929
5930 static int ocfs2_xattr_trusted_get(struct inode *inode, const char *name,
5931 void *buffer, size_t size)
5932 {
5933 if (strcmp(name, "") == 0)
5934 return -EINVAL;
5935 return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_TRUSTED, name,
5936 buffer, size);
5937 }
5938
5939 static int ocfs2_xattr_trusted_set(struct inode *inode, const char *name,
5940 const void *value, size_t size, int flags)
5941 {
5942 if (strcmp(name, "") == 0)
5943 return -EINVAL;
5944
5945 return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_TRUSTED, name, value,
5946 size, flags);
5947 }
5948
5949 struct xattr_handler ocfs2_xattr_trusted_handler = {
5950 .prefix = XATTR_TRUSTED_PREFIX,
5951 .list = ocfs2_xattr_trusted_list,
5952 .get = ocfs2_xattr_trusted_get,
5953 .set = ocfs2_xattr_trusted_set,
5954 };
5955
5956 /*
5957 * 'user' attributes support
5958 */
5959 static size_t ocfs2_xattr_user_list(struct inode *inode, char *list,
5960 size_t list_size, const char *name,
5961 size_t name_len)
5962 {
5963 const size_t prefix_len = XATTR_USER_PREFIX_LEN;
5964 const size_t total_len = prefix_len + name_len + 1;
5965 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5966
5967 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
5968 return 0;
5969
5970 if (list && total_len <= list_size) {
5971 memcpy(list, XATTR_USER_PREFIX, prefix_len);
5972 memcpy(list + prefix_len, name, name_len);
5973 list[prefix_len + name_len] = '\0';
5974 }
5975 return total_len;
5976 }
5977
5978 static int ocfs2_xattr_user_get(struct inode *inode, const char *name,
5979 void *buffer, size_t size)
5980 {
5981 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5982
5983 if (strcmp(name, "") == 0)
5984 return -EINVAL;
5985 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
5986 return -EOPNOTSUPP;
5987 return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_USER, name,
5988 buffer, size);
5989 }
5990
5991 static int ocfs2_xattr_user_set(struct inode *inode, const char *name,
5992 const void *value, size_t size, int flags)
5993 {
5994 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5995
5996 if (strcmp(name, "") == 0)
5997 return -EINVAL;
5998 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
5999 return -EOPNOTSUPP;
6000
6001 return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_USER, name, value,
6002 size, flags);
6003 }
6004
6005 struct xattr_handler ocfs2_xattr_user_handler = {
6006 .prefix = XATTR_USER_PREFIX,
6007 .list = ocfs2_xattr_user_list,
6008 .get = ocfs2_xattr_user_get,
6009 .set = ocfs2_xattr_user_set,
6010 };
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree