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ocfs2: Fix the update of name_offset when removing xattrs
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ocfs2 / xattr.c
blob82c2a0b53eb4f0d812e23a97c9be19f2bbf46f40
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 #include "acl.h"
60
61 struct ocfs2_xattr_def_value_root {
62 struct ocfs2_xattr_value_root xv;
63 struct ocfs2_extent_rec er;
64 };
65
66 struct ocfs2_xattr_bucket {
67 /* The inode these xattrs are associated with */
68 struct inode *bu_inode;
69
70 /* The actual buffers that make up the bucket */
71 struct buffer_head *bu_bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET];
72
73 /* How many blocks make up one bucket for this filesystem */
74 int bu_blocks;
75 };
76
77 struct ocfs2_xattr_set_ctxt {
78 handle_t *handle;
79 struct ocfs2_alloc_context *meta_ac;
80 struct ocfs2_alloc_context *data_ac;
81 struct ocfs2_cached_dealloc_ctxt dealloc;
82 };
83
84 #define OCFS2_XATTR_ROOT_SIZE (sizeof(struct ocfs2_xattr_def_value_root))
85 #define OCFS2_XATTR_INLINE_SIZE 80
86 #define OCFS2_XATTR_HEADER_GAP 4
87 #define OCFS2_XATTR_FREE_IN_IBODY (OCFS2_MIN_XATTR_INLINE_SIZE \
88 - sizeof(struct ocfs2_xattr_header) \
89 - OCFS2_XATTR_HEADER_GAP)
90 #define OCFS2_XATTR_FREE_IN_BLOCK(ptr) ((ptr)->i_sb->s_blocksize \
91 - sizeof(struct ocfs2_xattr_block) \
92 - sizeof(struct ocfs2_xattr_header) \
93 - OCFS2_XATTR_HEADER_GAP)
94
95 static struct ocfs2_xattr_def_value_root def_xv = {
96 .xv.xr_list.l_count = cpu_to_le16(1),
97 };
98
99 struct xattr_handler *ocfs2_xattr_handlers[] = {
100 &ocfs2_xattr_user_handler,
101 &ocfs2_xattr_acl_access_handler,
102 &ocfs2_xattr_acl_default_handler,
103 &ocfs2_xattr_trusted_handler,
104 &ocfs2_xattr_security_handler,
105 NULL
106 };
107
108 static struct xattr_handler *ocfs2_xattr_handler_map[OCFS2_XATTR_MAX] = {
109 [OCFS2_XATTR_INDEX_USER] = &ocfs2_xattr_user_handler,
110 [OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS]
111 = &ocfs2_xattr_acl_access_handler,
112 [OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT]
113 = &ocfs2_xattr_acl_default_handler,
114 [OCFS2_XATTR_INDEX_TRUSTED] = &ocfs2_xattr_trusted_handler,
115 [OCFS2_XATTR_INDEX_SECURITY] = &ocfs2_xattr_security_handler,
116 };
117
118 struct ocfs2_xattr_info {
119 int xi_name_index;
120 const char *xi_name;
121 int xi_name_len;
122 const void *xi_value;
123 size_t xi_value_len;
124 };
125
126 struct ocfs2_xattr_search {
127 struct buffer_head *inode_bh;
128 /*
129 * xattr_bh point to the block buffer head which has extended attribute
130 * when extended attribute in inode, xattr_bh is equal to inode_bh.
131 */
132 struct buffer_head *xattr_bh;
133 struct ocfs2_xattr_header *header;
134 struct ocfs2_xattr_bucket *bucket;
135 void *base;
136 void *end;
137 struct ocfs2_xattr_entry *here;
138 int not_found;
139 };
140
141 /* Operations on struct ocfs2_xa_entry */
142 struct ocfs2_xa_loc;
143 struct ocfs2_xa_loc_operations {
144 /*
145 * Journal functions
146 */
147 int (*xlo_journal_access)(handle_t *handle, struct ocfs2_xa_loc *loc,
148 int type);
149 void (*xlo_journal_dirty)(handle_t *handle, struct ocfs2_xa_loc *loc);
150
151 /*
152 * Return a pointer to the appropriate buffer in loc->xl_storage
153 * at the given offset from loc->xl_header.
154 */
155 void *(*xlo_offset_pointer)(struct ocfs2_xa_loc *loc, int offset);
156
157 /* Can we reuse the existing entry for the new value? */
158 int (*xlo_can_reuse)(struct ocfs2_xa_loc *loc,
159 struct ocfs2_xattr_info *xi);
160
161 /* How much space is needed for the new value? */
162 int (*xlo_check_space)(struct ocfs2_xa_loc *loc,
163 struct ocfs2_xattr_info *xi);
164
165 /*
166 * Return the offset of the first name+value pair. This is
167 * the start of our downward-filling free space.
168 */
169 int (*xlo_get_free_start)(struct ocfs2_xa_loc *loc);
170
171 /*
172 * Remove the name+value at this location. Do whatever is
173 * appropriate with the remaining name+value pairs.
174 */
175 void (*xlo_wipe_namevalue)(struct ocfs2_xa_loc *loc);
176
177 /* Fill xl_entry with a new entry */
178 void (*xlo_add_entry)(struct ocfs2_xa_loc *loc, u32 name_hash);
179
180 /* Add name+value storage to an entry */
181 void (*xlo_add_namevalue)(struct ocfs2_xa_loc *loc, int size);
182
183 /*
184 * Initialize the value buf's access and bh fields for this entry.
185 * ocfs2_xa_fill_value_buf() will handle the xv pointer.
186 */
187 void (*xlo_fill_value_buf)(struct ocfs2_xa_loc *loc,
188 struct ocfs2_xattr_value_buf *vb);
189 };
190
191 /*
192 * Describes an xattr entry location. This is a memory structure
193 * tracking the on-disk structure.
194 */
195 struct ocfs2_xa_loc {
196 /* This xattr belongs to this inode */
197 struct inode *xl_inode;
198
199 /* The ocfs2_xattr_header inside the on-disk storage. Not NULL. */
200 struct ocfs2_xattr_header *xl_header;
201
202 /* Bytes from xl_header to the end of the storage */
203 int xl_size;
204
205 /*
206 * The ocfs2_xattr_entry this location describes. If this is
207 * NULL, this location describes the on-disk structure where it
208 * would have been.
209 */
210 struct ocfs2_xattr_entry *xl_entry;
211
212 /*
213 * Internal housekeeping
214 */
215
216 /* Buffer(s) containing this entry */
217 void *xl_storage;
218
219 /* Operations on the storage backing this location */
220 const struct ocfs2_xa_loc_operations *xl_ops;
221 };
222
223 /*
224 * Convenience functions to calculate how much space is needed for a
225 * given name+value pair
226 */
227 static int namevalue_size(int name_len, uint64_t value_len)
228 {
229 if (value_len > OCFS2_XATTR_INLINE_SIZE)
230 return OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
231 else
232 return OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(value_len);
233 }
234
235 static int namevalue_size_xi(struct ocfs2_xattr_info *xi)
236 {
237 return namevalue_size(xi->xi_name_len, xi->xi_value_len);
238 }
239
240 static int namevalue_size_xe(struct ocfs2_xattr_entry *xe)
241 {
242 u64 value_len = le64_to_cpu(xe->xe_value_size);
243
244 BUG_ON((value_len > OCFS2_XATTR_INLINE_SIZE) &&
245 ocfs2_xattr_is_local(xe));
246 return namevalue_size(xe->xe_name_len, value_len);
247 }
248
249
250 static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
251 struct ocfs2_xattr_header *xh,
252 int index,
253 int *block_off,
254 int *new_offset);
255
256 static int ocfs2_xattr_block_find(struct inode *inode,
257 int name_index,
258 const char *name,
259 struct ocfs2_xattr_search *xs);
260 static int ocfs2_xattr_index_block_find(struct inode *inode,
261 struct buffer_head *root_bh,
262 int name_index,
263 const char *name,
264 struct ocfs2_xattr_search *xs);
265
266 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
267 struct buffer_head *blk_bh,
268 char *buffer,
269 size_t buffer_size);
270
271 static int ocfs2_xattr_create_index_block(struct inode *inode,
272 struct ocfs2_xattr_search *xs,
273 struct ocfs2_xattr_set_ctxt *ctxt);
274
275 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
276 struct ocfs2_xattr_info *xi,
277 struct ocfs2_xattr_search *xs,
278 struct ocfs2_xattr_set_ctxt *ctxt);
279
280 typedef int (xattr_tree_rec_func)(struct inode *inode,
281 struct buffer_head *root_bh,
282 u64 blkno, u32 cpos, u32 len, void *para);
283 static int ocfs2_iterate_xattr_index_block(struct inode *inode,
284 struct buffer_head *root_bh,
285 xattr_tree_rec_func *rec_func,
286 void *para);
287 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
288 struct ocfs2_xattr_bucket *bucket,
289 void *para);
290 static int ocfs2_rm_xattr_cluster(struct inode *inode,
291 struct buffer_head *root_bh,
292 u64 blkno,
293 u32 cpos,
294 u32 len,
295 void *para);
296
297 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
298 u64 src_blk, u64 last_blk, u64 to_blk,
299 unsigned int start_bucket,
300 u32 *first_hash);
301 static int ocfs2_prepare_refcount_xattr(struct inode *inode,
302 struct ocfs2_dinode *di,
303 struct ocfs2_xattr_info *xi,
304 struct ocfs2_xattr_search *xis,
305 struct ocfs2_xattr_search *xbs,
306 struct ocfs2_refcount_tree **ref_tree,
307 int *meta_need,
308 int *credits);
309 static int ocfs2_get_xattr_tree_value_root(struct super_block *sb,
310 struct ocfs2_xattr_bucket *bucket,
311 int offset,
312 struct ocfs2_xattr_value_root **xv,
313 struct buffer_head **bh);
314
315 static inline u16 ocfs2_xattr_buckets_per_cluster(struct ocfs2_super *osb)
316 {
317 return (1 << osb->s_clustersize_bits) / OCFS2_XATTR_BUCKET_SIZE;
318 }
319
320 static inline u16 ocfs2_blocks_per_xattr_bucket(struct super_block *sb)
321 {
322 return OCFS2_XATTR_BUCKET_SIZE / (1 << sb->s_blocksize_bits);
323 }
324
325 #define bucket_blkno(_b) ((_b)->bu_bhs[0]->b_blocknr)
326 #define bucket_block(_b, _n) ((_b)->bu_bhs[(_n)]->b_data)
327 #define bucket_xh(_b) ((struct ocfs2_xattr_header *)bucket_block((_b), 0))
328
329 static struct ocfs2_xattr_bucket *ocfs2_xattr_bucket_new(struct inode *inode)
330 {
331 struct ocfs2_xattr_bucket *bucket;
332 int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
333
334 BUG_ON(blks > OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET);
335
336 bucket = kzalloc(sizeof(struct ocfs2_xattr_bucket), GFP_NOFS);
337 if (bucket) {
338 bucket->bu_inode = inode;
339 bucket->bu_blocks = blks;
340 }
341
342 return bucket;
343 }
344
345 static void ocfs2_xattr_bucket_relse(struct ocfs2_xattr_bucket *bucket)
346 {
347 int i;
348
349 for (i = 0; i < bucket->bu_blocks; i++) {
350 brelse(bucket->bu_bhs[i]);
351 bucket->bu_bhs[i] = NULL;
352 }
353 }
354
355 static void ocfs2_xattr_bucket_free(struct ocfs2_xattr_bucket *bucket)
356 {
357 if (bucket) {
358 ocfs2_xattr_bucket_relse(bucket);
359 bucket->bu_inode = NULL;
360 kfree(bucket);
361 }
362 }
363
364 /*
365 * A bucket that has never been written to disk doesn't need to be
366 * read. We just need the buffer_heads. Don't call this for
367 * buckets that are already on disk. ocfs2_read_xattr_bucket() initializes
368 * them fully.
369 */
370 static int ocfs2_init_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
371 u64 xb_blkno)
372 {
373 int i, rc = 0;
374
375 for (i = 0; i < bucket->bu_blocks; i++) {
376 bucket->bu_bhs[i] = sb_getblk(bucket->bu_inode->i_sb,
377 xb_blkno + i);
378 if (!bucket->bu_bhs[i]) {
379 rc = -EIO;
380 mlog_errno(rc);
381 break;
382 }
383
384 if (!ocfs2_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
385 bucket->bu_bhs[i]))
386 ocfs2_set_new_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
387 bucket->bu_bhs[i]);
388 }
389
390 if (rc)
391 ocfs2_xattr_bucket_relse(bucket);
392 return rc;
393 }
394
395 /* Read the xattr bucket at xb_blkno */
396 static int ocfs2_read_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
397 u64 xb_blkno)
398 {
399 int rc;
400
401 rc = ocfs2_read_blocks(INODE_CACHE(bucket->bu_inode), xb_blkno,
402 bucket->bu_blocks, bucket->bu_bhs, 0,
403 NULL);
404 if (!rc) {
405 spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
406 rc = ocfs2_validate_meta_ecc_bhs(bucket->bu_inode->i_sb,
407 bucket->bu_bhs,
408 bucket->bu_blocks,
409 &bucket_xh(bucket)->xh_check);
410 spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
411 if (rc)
412 mlog_errno(rc);
413 }
414
415 if (rc)
416 ocfs2_xattr_bucket_relse(bucket);
417 return rc;
418 }
419
420 static int ocfs2_xattr_bucket_journal_access(handle_t *handle,
421 struct ocfs2_xattr_bucket *bucket,
422 int type)
423 {
424 int i, rc = 0;
425
426 for (i = 0; i < bucket->bu_blocks; i++) {
427 rc = ocfs2_journal_access(handle,
428 INODE_CACHE(bucket->bu_inode),
429 bucket->bu_bhs[i], type);
430 if (rc) {
431 mlog_errno(rc);
432 break;
433 }
434 }
435
436 return rc;
437 }
438
439 static void ocfs2_xattr_bucket_journal_dirty(handle_t *handle,
440 struct ocfs2_xattr_bucket *bucket)
441 {
442 int i;
443
444 spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
445 ocfs2_compute_meta_ecc_bhs(bucket->bu_inode->i_sb,
446 bucket->bu_bhs, bucket->bu_blocks,
447 &bucket_xh(bucket)->xh_check);
448 spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
449
450 for (i = 0; i < bucket->bu_blocks; i++)
451 ocfs2_journal_dirty(handle, bucket->bu_bhs[i]);
452 }
453
454 static void ocfs2_xattr_bucket_copy_data(struct ocfs2_xattr_bucket *dest,
455 struct ocfs2_xattr_bucket *src)
456 {
457 int i;
458 int blocksize = src->bu_inode->i_sb->s_blocksize;
459
460 BUG_ON(dest->bu_blocks != src->bu_blocks);
461 BUG_ON(dest->bu_inode != src->bu_inode);
462
463 for (i = 0; i < src->bu_blocks; i++) {
464 memcpy(bucket_block(dest, i), bucket_block(src, i),
465 blocksize);
466 }
467 }
468
469 static int ocfs2_validate_xattr_block(struct super_block *sb,
470 struct buffer_head *bh)
471 {
472 int rc;
473 struct ocfs2_xattr_block *xb =
474 (struct ocfs2_xattr_block *)bh->b_data;
475
476 mlog(0, "Validating xattr block %llu\n",
477 (unsigned long long)bh->b_blocknr);
478
479 BUG_ON(!buffer_uptodate(bh));
480
481 /*
482 * If the ecc fails, we return the error but otherwise
483 * leave the filesystem running. We know any error is
484 * local to this block.
485 */
486 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &xb->xb_check);
487 if (rc)
488 return rc;
489
490 /*
491 * Errors after here are fatal
492 */
493
494 if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
495 ocfs2_error(sb,
496 "Extended attribute block #%llu has bad "
497 "signature %.*s",
498 (unsigned long long)bh->b_blocknr, 7,
499 xb->xb_signature);
500 return -EINVAL;
501 }
502
503 if (le64_to_cpu(xb->xb_blkno) != bh->b_blocknr) {
504 ocfs2_error(sb,
505 "Extended attribute block #%llu has an "
506 "invalid xb_blkno of %llu",
507 (unsigned long long)bh->b_blocknr,
508 (unsigned long long)le64_to_cpu(xb->xb_blkno));
509 return -EINVAL;
510 }
511
512 if (le32_to_cpu(xb->xb_fs_generation) != OCFS2_SB(sb)->fs_generation) {
513 ocfs2_error(sb,
514 "Extended attribute block #%llu has an invalid "
515 "xb_fs_generation of #%u",
516 (unsigned long long)bh->b_blocknr,
517 le32_to_cpu(xb->xb_fs_generation));
518 return -EINVAL;
519 }
520
521 return 0;
522 }
523
524 static int ocfs2_read_xattr_block(struct inode *inode, u64 xb_blkno,
525 struct buffer_head **bh)
526 {
527 int rc;
528 struct buffer_head *tmp = *bh;
529
530 rc = ocfs2_read_block(INODE_CACHE(inode), xb_blkno, &tmp,
531 ocfs2_validate_xattr_block);
532
533 /* If ocfs2_read_block() got us a new bh, pass it up. */
534 if (!rc && !*bh)
535 *bh = tmp;
536
537 return rc;
538 }
539
540 static inline const char *ocfs2_xattr_prefix(int name_index)
541 {
542 struct xattr_handler *handler = NULL;
543
544 if (name_index > 0 && name_index < OCFS2_XATTR_MAX)
545 handler = ocfs2_xattr_handler_map[name_index];
546
547 return handler ? handler->prefix : NULL;
548 }
549
550 static u32 ocfs2_xattr_name_hash(struct inode *inode,
551 const char *name,
552 int name_len)
553 {
554 /* Get hash value of uuid from super block */
555 u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash;
556 int i;
557
558 /* hash extended attribute name */
559 for (i = 0; i < name_len; i++) {
560 hash = (hash << OCFS2_HASH_SHIFT) ^
561 (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
562 *name++;
563 }
564
565 return hash;
566 }
567
568 static int ocfs2_xattr_entry_real_size(int name_len, size_t value_len)
569 {
570 return namevalue_size(name_len, value_len) +
571 sizeof(struct ocfs2_xattr_entry);
572 }
573
574 static int ocfs2_xi_entry_usage(struct ocfs2_xattr_info *xi)
575 {
576 return namevalue_size_xi(xi) +
577 sizeof(struct ocfs2_xattr_entry);
578 }
579
580 static int ocfs2_xe_entry_usage(struct ocfs2_xattr_entry *xe)
581 {
582 return namevalue_size_xe(xe) +
583 sizeof(struct ocfs2_xattr_entry);
584 }
585
586 int ocfs2_calc_security_init(struct inode *dir,
587 struct ocfs2_security_xattr_info *si,
588 int *want_clusters,
589 int *xattr_credits,
590 struct ocfs2_alloc_context **xattr_ac)
591 {
592 int ret = 0;
593 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
594 int s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
595 si->value_len);
596
597 /*
598 * The max space of security xattr taken inline is
599 * 256(name) + 80(value) + 16(entry) = 352 bytes,
600 * So reserve one metadata block for it is ok.
601 */
602 if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
603 s_size > OCFS2_XATTR_FREE_IN_IBODY) {
604 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, xattr_ac);
605 if (ret) {
606 mlog_errno(ret);
607 return ret;
608 }
609 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
610 }
611
612 /* reserve clusters for xattr value which will be set in B tree*/
613 if (si->value_len > OCFS2_XATTR_INLINE_SIZE) {
614 int new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
615 si->value_len);
616
617 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
618 new_clusters);
619 *want_clusters += new_clusters;
620 }
621 return ret;
622 }
623
624 int ocfs2_calc_xattr_init(struct inode *dir,
625 struct buffer_head *dir_bh,
626 int mode,
627 struct ocfs2_security_xattr_info *si,
628 int *want_clusters,
629 int *xattr_credits,
630 int *want_meta)
631 {
632 int ret = 0;
633 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
634 int s_size = 0, a_size = 0, acl_len = 0, new_clusters;
635
636 if (si->enable)
637 s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
638 si->value_len);
639
640 if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
641 acl_len = ocfs2_xattr_get_nolock(dir, dir_bh,
642 OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT,
643 "", NULL, 0);
644 if (acl_len > 0) {
645 a_size = ocfs2_xattr_entry_real_size(0, acl_len);
646 if (S_ISDIR(mode))
647 a_size <<= 1;
648 } else if (acl_len != 0 && acl_len != -ENODATA) {
649 mlog_errno(ret);
650 return ret;
651 }
652 }
653
654 if (!(s_size + a_size))
655 return ret;
656
657 /*
658 * The max space of security xattr taken inline is
659 * 256(name) + 80(value) + 16(entry) = 352 bytes,
660 * The max space of acl xattr taken inline is
661 * 80(value) + 16(entry) * 2(if directory) = 192 bytes,
662 * when blocksize = 512, may reserve one more cluser for
663 * xattr bucket, otherwise reserve one metadata block
664 * for them is ok.
665 * If this is a new directory with inline data,
666 * we choose to reserve the entire inline area for
667 * directory contents and force an external xattr block.
668 */
669 if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
670 (S_ISDIR(mode) && ocfs2_supports_inline_data(osb)) ||
671 (s_size + a_size) > OCFS2_XATTR_FREE_IN_IBODY) {
672 *want_meta = *want_meta + 1;
673 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
674 }
675
676 if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE &&
677 (s_size + a_size) > OCFS2_XATTR_FREE_IN_BLOCK(dir)) {
678 *want_clusters += 1;
679 *xattr_credits += ocfs2_blocks_per_xattr_bucket(dir->i_sb);
680 }
681
682 /*
683 * reserve credits and clusters for xattrs which has large value
684 * and have to be set outside
685 */
686 if (si->enable && si->value_len > OCFS2_XATTR_INLINE_SIZE) {
687 new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
688 si->value_len);
689 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
690 new_clusters);
691 *want_clusters += new_clusters;
692 }
693 if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL &&
694 acl_len > OCFS2_XATTR_INLINE_SIZE) {
695 /* for directory, it has DEFAULT and ACCESS two types of acls */
696 new_clusters = (S_ISDIR(mode) ? 2 : 1) *
697 ocfs2_clusters_for_bytes(dir->i_sb, acl_len);
698 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
699 new_clusters);
700 *want_clusters += new_clusters;
701 }
702
703 return ret;
704 }
705
706 static int ocfs2_xattr_extend_allocation(struct inode *inode,
707 u32 clusters_to_add,
708 struct ocfs2_xattr_value_buf *vb,
709 struct ocfs2_xattr_set_ctxt *ctxt)
710 {
711 int status = 0;
712 handle_t *handle = ctxt->handle;
713 enum ocfs2_alloc_restarted why;
714 u32 prev_clusters, logical_start = le32_to_cpu(vb->vb_xv->xr_clusters);
715 struct ocfs2_extent_tree et;
716
717 mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add);
718
719 ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
720
721 status = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
722 OCFS2_JOURNAL_ACCESS_WRITE);
723 if (status < 0) {
724 mlog_errno(status);
725 goto leave;
726 }
727
728 prev_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
729 status = ocfs2_add_clusters_in_btree(handle,
730 &et,
731 &logical_start,
732 clusters_to_add,
733 0,
734 ctxt->data_ac,
735 ctxt->meta_ac,
736 &why);
737 if (status < 0) {
738 mlog_errno(status);
739 goto leave;
740 }
741
742 status = ocfs2_journal_dirty(handle, vb->vb_bh);
743 if (status < 0) {
744 mlog_errno(status);
745 goto leave;
746 }
747
748 clusters_to_add -= le32_to_cpu(vb->vb_xv->xr_clusters) - prev_clusters;
749
750 /*
751 * We should have already allocated enough space before the transaction,
752 * so no need to restart.
753 */
754 BUG_ON(why != RESTART_NONE || clusters_to_add);
755
756 leave:
757
758 return status;
759 }
760
761 static int __ocfs2_remove_xattr_range(struct inode *inode,
762 struct ocfs2_xattr_value_buf *vb,
763 u32 cpos, u32 phys_cpos, u32 len,
764 unsigned int ext_flags,
765 struct ocfs2_xattr_set_ctxt *ctxt)
766 {
767 int ret;
768 u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
769 handle_t *handle = ctxt->handle;
770 struct ocfs2_extent_tree et;
771
772 ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
773
774 ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
775 OCFS2_JOURNAL_ACCESS_WRITE);
776 if (ret) {
777 mlog_errno(ret);
778 goto out;
779 }
780
781 ret = ocfs2_remove_extent(handle, &et, cpos, len, ctxt->meta_ac,
782 &ctxt->dealloc);
783 if (ret) {
784 mlog_errno(ret);
785 goto out;
786 }
787
788 le32_add_cpu(&vb->vb_xv->xr_clusters, -len);
789
790 ret = ocfs2_journal_dirty(handle, vb->vb_bh);
791 if (ret) {
792 mlog_errno(ret);
793 goto out;
794 }
795
796 if (ext_flags & OCFS2_EXT_REFCOUNTED)
797 ret = ocfs2_decrease_refcount(inode, handle,
798 ocfs2_blocks_to_clusters(inode->i_sb,
799 phys_blkno),
800 len, ctxt->meta_ac, &ctxt->dealloc, 1);
801 else
802 ret = ocfs2_cache_cluster_dealloc(&ctxt->dealloc,
803 phys_blkno, len);
804 if (ret)
805 mlog_errno(ret);
806
807 out:
808 return ret;
809 }
810
811 static int ocfs2_xattr_shrink_size(struct inode *inode,
812 u32 old_clusters,
813 u32 new_clusters,
814 struct ocfs2_xattr_value_buf *vb,
815 struct ocfs2_xattr_set_ctxt *ctxt)
816 {
817 int ret = 0;
818 unsigned int ext_flags;
819 u32 trunc_len, cpos, phys_cpos, alloc_size;
820 u64 block;
821
822 if (old_clusters <= new_clusters)
823 return 0;
824
825 cpos = new_clusters;
826 trunc_len = old_clusters - new_clusters;
827 while (trunc_len) {
828 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
829 &alloc_size,
830 &vb->vb_xv->xr_list, &ext_flags);
831 if (ret) {
832 mlog_errno(ret);
833 goto out;
834 }
835
836 if (alloc_size > trunc_len)
837 alloc_size = trunc_len;
838
839 ret = __ocfs2_remove_xattr_range(inode, vb, cpos,
840 phys_cpos, alloc_size,
841 ext_flags, ctxt);
842 if (ret) {
843 mlog_errno(ret);
844 goto out;
845 }
846
847 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
848 ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode),
849 block, alloc_size);
850 cpos += alloc_size;
851 trunc_len -= alloc_size;
852 }
853
854 out:
855 return ret;
856 }
857
858 static int ocfs2_xattr_value_truncate(struct inode *inode,
859 struct ocfs2_xattr_value_buf *vb,
860 int len,
861 struct ocfs2_xattr_set_ctxt *ctxt)
862 {
863 int ret;
864 u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
865 u32 old_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
866
867 if (new_clusters == old_clusters)
868 return 0;
869
870 if (new_clusters > old_clusters)
871 ret = ocfs2_xattr_extend_allocation(inode,
872 new_clusters - old_clusters,
873 vb, ctxt);
874 else
875 ret = ocfs2_xattr_shrink_size(inode,
876 old_clusters, new_clusters,
877 vb, ctxt);
878
879 return ret;
880 }
881
882 static int ocfs2_xattr_list_entry(char *buffer, size_t size,
883 size_t *result, const char *prefix,
884 const char *name, int name_len)
885 {
886 char *p = buffer + *result;
887 int prefix_len = strlen(prefix);
888 int total_len = prefix_len + name_len + 1;
889
890 *result += total_len;
891
892 /* we are just looking for how big our buffer needs to be */
893 if (!size)
894 return 0;
895
896 if (*result > size)
897 return -ERANGE;
898
899 memcpy(p, prefix, prefix_len);
900 memcpy(p + prefix_len, name, name_len);
901 p[prefix_len + name_len] = '\0';
902
903 return 0;
904 }
905
906 static int ocfs2_xattr_list_entries(struct inode *inode,
907 struct ocfs2_xattr_header *header,
908 char *buffer, size_t buffer_size)
909 {
910 size_t result = 0;
911 int i, type, ret;
912 const char *prefix, *name;
913
914 for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
915 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
916 type = ocfs2_xattr_get_type(entry);
917 prefix = ocfs2_xattr_prefix(type);
918
919 if (prefix) {
920 name = (const char *)header +
921 le16_to_cpu(entry->xe_name_offset);
922
923 ret = ocfs2_xattr_list_entry(buffer, buffer_size,
924 &result, prefix, name,
925 entry->xe_name_len);
926 if (ret)
927 return ret;
928 }
929 }
930
931 return result;
932 }
933
934 int ocfs2_has_inline_xattr_value_outside(struct inode *inode,
935 struct ocfs2_dinode *di)
936 {
937 struct ocfs2_xattr_header *xh;
938 int i;
939
940 xh = (struct ocfs2_xattr_header *)
941 ((void *)di + inode->i_sb->s_blocksize -
942 le16_to_cpu(di->i_xattr_inline_size));
943
944 for (i = 0; i < le16_to_cpu(xh->xh_count); i++)
945 if (!ocfs2_xattr_is_local(&xh->xh_entries[i]))
946 return 1;
947
948 return 0;
949 }
950
951 static int ocfs2_xattr_ibody_list(struct inode *inode,
952 struct ocfs2_dinode *di,
953 char *buffer,
954 size_t buffer_size)
955 {
956 struct ocfs2_xattr_header *header = NULL;
957 struct ocfs2_inode_info *oi = OCFS2_I(inode);
958 int ret = 0;
959
960 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
961 return ret;
962
963 header = (struct ocfs2_xattr_header *)
964 ((void *)di + inode->i_sb->s_blocksize -
965 le16_to_cpu(di->i_xattr_inline_size));
966
967 ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size);
968
969 return ret;
970 }
971
972 static int ocfs2_xattr_block_list(struct inode *inode,
973 struct ocfs2_dinode *di,
974 char *buffer,
975 size_t buffer_size)
976 {
977 struct buffer_head *blk_bh = NULL;
978 struct ocfs2_xattr_block *xb;
979 int ret = 0;
980
981 if (!di->i_xattr_loc)
982 return ret;
983
984 ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
985 &blk_bh);
986 if (ret < 0) {
987 mlog_errno(ret);
988 return ret;
989 }
990
991 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
992 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
993 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
994 ret = ocfs2_xattr_list_entries(inode, header,
995 buffer, buffer_size);
996 } else
997 ret = ocfs2_xattr_tree_list_index_block(inode, blk_bh,
998 buffer, buffer_size);
999
1000 brelse(blk_bh);
1001
1002 return ret;
1003 }
1004
1005 ssize_t ocfs2_listxattr(struct dentry *dentry,
1006 char *buffer,
1007 size_t size)
1008 {
1009 int ret = 0, i_ret = 0, b_ret = 0;
1010 struct buffer_head *di_bh = NULL;
1011 struct ocfs2_dinode *di = NULL;
1012 struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode);
1013
1014 if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
1015 return -EOPNOTSUPP;
1016
1017 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1018 return ret;
1019
1020 ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0);
1021 if (ret < 0) {
1022 mlog_errno(ret);
1023 return ret;
1024 }
1025
1026 di = (struct ocfs2_dinode *)di_bh->b_data;
1027
1028 down_read(&oi->ip_xattr_sem);
1029 i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size);
1030 if (i_ret < 0)
1031 b_ret = 0;
1032 else {
1033 if (buffer) {
1034 buffer += i_ret;
1035 size -= i_ret;
1036 }
1037 b_ret = ocfs2_xattr_block_list(dentry->d_inode, di,
1038 buffer, size);
1039 if (b_ret < 0)
1040 i_ret = 0;
1041 }
1042 up_read(&oi->ip_xattr_sem);
1043 ocfs2_inode_unlock(dentry->d_inode, 0);
1044
1045 brelse(di_bh);
1046
1047 return i_ret + b_ret;
1048 }
1049
1050 static int ocfs2_xattr_find_entry(int name_index,
1051 const char *name,
1052 struct ocfs2_xattr_search *xs)
1053 {
1054 struct ocfs2_xattr_entry *entry;
1055 size_t name_len;
1056 int i, cmp = 1;
1057
1058 if (name == NULL)
1059 return -EINVAL;
1060
1061 name_len = strlen(name);
1062 entry = xs->here;
1063 for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
1064 cmp = name_index - ocfs2_xattr_get_type(entry);
1065 if (!cmp)
1066 cmp = name_len - entry->xe_name_len;
1067 if (!cmp)
1068 cmp = memcmp(name, (xs->base +
1069 le16_to_cpu(entry->xe_name_offset)),
1070 name_len);
1071 if (cmp == 0)
1072 break;
1073 entry += 1;
1074 }
1075 xs->here = entry;
1076
1077 return cmp ? -ENODATA : 0;
1078 }
1079
1080 static int ocfs2_xattr_get_value_outside(struct inode *inode,
1081 struct ocfs2_xattr_value_root *xv,
1082 void *buffer,
1083 size_t len)
1084 {
1085 u32 cpos, p_cluster, num_clusters, bpc, clusters;
1086 u64 blkno;
1087 int i, ret = 0;
1088 size_t cplen, blocksize;
1089 struct buffer_head *bh = NULL;
1090 struct ocfs2_extent_list *el;
1091
1092 el = &xv->xr_list;
1093 clusters = le32_to_cpu(xv->xr_clusters);
1094 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1095 blocksize = inode->i_sb->s_blocksize;
1096
1097 cpos = 0;
1098 while (cpos < clusters) {
1099 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
1100 &num_clusters, el, NULL);
1101 if (ret) {
1102 mlog_errno(ret);
1103 goto out;
1104 }
1105
1106 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
1107 /* Copy ocfs2_xattr_value */
1108 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1109 ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
1110 &bh, NULL);
1111 if (ret) {
1112 mlog_errno(ret);
1113 goto out;
1114 }
1115
1116 cplen = len >= blocksize ? blocksize : len;
1117 memcpy(buffer, bh->b_data, cplen);
1118 len -= cplen;
1119 buffer += cplen;
1120
1121 brelse(bh);
1122 bh = NULL;
1123 if (len == 0)
1124 break;
1125 }
1126 cpos += num_clusters;
1127 }
1128 out:
1129 return ret;
1130 }
1131
1132 static int ocfs2_xattr_ibody_get(struct inode *inode,
1133 int name_index,
1134 const char *name,
1135 void *buffer,
1136 size_t buffer_size,
1137 struct ocfs2_xattr_search *xs)
1138 {
1139 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1140 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1141 struct ocfs2_xattr_value_root *xv;
1142 size_t size;
1143 int ret = 0;
1144
1145 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
1146 return -ENODATA;
1147
1148 xs->end = (void *)di + inode->i_sb->s_blocksize;
1149 xs->header = (struct ocfs2_xattr_header *)
1150 (xs->end - le16_to_cpu(di->i_xattr_inline_size));
1151 xs->base = (void *)xs->header;
1152 xs->here = xs->header->xh_entries;
1153
1154 ret = ocfs2_xattr_find_entry(name_index, name, xs);
1155 if (ret)
1156 return ret;
1157 size = le64_to_cpu(xs->here->xe_value_size);
1158 if (buffer) {
1159 if (size > buffer_size)
1160 return -ERANGE;
1161 if (ocfs2_xattr_is_local(xs->here)) {
1162 memcpy(buffer, (void *)xs->base +
1163 le16_to_cpu(xs->here->xe_name_offset) +
1164 OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
1165 } else {
1166 xv = (struct ocfs2_xattr_value_root *)
1167 (xs->base + le16_to_cpu(
1168 xs->here->xe_name_offset) +
1169 OCFS2_XATTR_SIZE(xs->here->xe_name_len));
1170 ret = ocfs2_xattr_get_value_outside(inode, xv,
1171 buffer, size);
1172 if (ret < 0) {
1173 mlog_errno(ret);
1174 return ret;
1175 }
1176 }
1177 }
1178
1179 return size;
1180 }
1181
1182 static int ocfs2_xattr_block_get(struct inode *inode,
1183 int name_index,
1184 const char *name,
1185 void *buffer,
1186 size_t buffer_size,
1187 struct ocfs2_xattr_search *xs)
1188 {
1189 struct ocfs2_xattr_block *xb;
1190 struct ocfs2_xattr_value_root *xv;
1191 size_t size;
1192 int ret = -ENODATA, name_offset, name_len, i;
1193 int uninitialized_var(block_off);
1194
1195 xs->bucket = ocfs2_xattr_bucket_new(inode);
1196 if (!xs->bucket) {
1197 ret = -ENOMEM;
1198 mlog_errno(ret);
1199 goto cleanup;
1200 }
1201
1202 ret = ocfs2_xattr_block_find(inode, name_index, name, xs);
1203 if (ret) {
1204 mlog_errno(ret);
1205 goto cleanup;
1206 }
1207
1208 if (xs->not_found) {
1209 ret = -ENODATA;
1210 goto cleanup;
1211 }
1212
1213 xb = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1214 size = le64_to_cpu(xs->here->xe_value_size);
1215 if (buffer) {
1216 ret = -ERANGE;
1217 if (size > buffer_size)
1218 goto cleanup;
1219
1220 name_offset = le16_to_cpu(xs->here->xe_name_offset);
1221 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
1222 i = xs->here - xs->header->xh_entries;
1223
1224 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
1225 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
1226 bucket_xh(xs->bucket),
1227 i,
1228 &block_off,
1229 &name_offset);
1230 xs->base = bucket_block(xs->bucket, block_off);
1231 }
1232 if (ocfs2_xattr_is_local(xs->here)) {
1233 memcpy(buffer, (void *)xs->base +
1234 name_offset + name_len, size);
1235 } else {
1236 xv = (struct ocfs2_xattr_value_root *)
1237 (xs->base + name_offset + name_len);
1238 ret = ocfs2_xattr_get_value_outside(inode, xv,
1239 buffer, size);
1240 if (ret < 0) {
1241 mlog_errno(ret);
1242 goto cleanup;
1243 }
1244 }
1245 }
1246 ret = size;
1247 cleanup:
1248 ocfs2_xattr_bucket_free(xs->bucket);
1249
1250 brelse(xs->xattr_bh);
1251 xs->xattr_bh = NULL;
1252 return ret;
1253 }
1254
1255 int ocfs2_xattr_get_nolock(struct inode *inode,
1256 struct buffer_head *di_bh,
1257 int name_index,
1258 const char *name,
1259 void *buffer,
1260 size_t buffer_size)
1261 {
1262 int ret;
1263 struct ocfs2_dinode *di = NULL;
1264 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1265 struct ocfs2_xattr_search xis = {
1266 .not_found = -ENODATA,
1267 };
1268 struct ocfs2_xattr_search xbs = {
1269 .not_found = -ENODATA,
1270 };
1271
1272 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1273 return -EOPNOTSUPP;
1274
1275 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1276 ret = -ENODATA;
1277
1278 xis.inode_bh = xbs.inode_bh = di_bh;
1279 di = (struct ocfs2_dinode *)di_bh->b_data;
1280
1281 down_read(&oi->ip_xattr_sem);
1282 ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
1283 buffer_size, &xis);
1284 if (ret == -ENODATA && di->i_xattr_loc)
1285 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
1286 buffer_size, &xbs);
1287 up_read(&oi->ip_xattr_sem);
1288
1289 return ret;
1290 }
1291
1292 /* ocfs2_xattr_get()
1293 *
1294 * Copy an extended attribute into the buffer provided.
1295 * Buffer is NULL to compute the size of buffer required.
1296 */
1297 static int ocfs2_xattr_get(struct inode *inode,
1298 int name_index,
1299 const char *name,
1300 void *buffer,
1301 size_t buffer_size)
1302 {
1303 int ret;
1304 struct buffer_head *di_bh = NULL;
1305
1306 ret = ocfs2_inode_lock(inode, &di_bh, 0);
1307 if (ret < 0) {
1308 mlog_errno(ret);
1309 return ret;
1310 }
1311 ret = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
1312 name, buffer, buffer_size);
1313
1314 ocfs2_inode_unlock(inode, 0);
1315
1316 brelse(di_bh);
1317
1318 return ret;
1319 }
1320
1321 static int __ocfs2_xattr_set_value_outside(struct inode *inode,
1322 handle_t *handle,
1323 struct ocfs2_xattr_value_buf *vb,
1324 const void *value,
1325 int value_len)
1326 {
1327 int ret = 0, i, cp_len;
1328 u16 blocksize = inode->i_sb->s_blocksize;
1329 u32 p_cluster, num_clusters;
1330 u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1331 u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
1332 u64 blkno;
1333 struct buffer_head *bh = NULL;
1334 unsigned int ext_flags;
1335 struct ocfs2_xattr_value_root *xv = vb->vb_xv;
1336
1337 BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
1338
1339 while (cpos < clusters) {
1340 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
1341 &num_clusters, &xv->xr_list,
1342 &ext_flags);
1343 if (ret) {
1344 mlog_errno(ret);
1345 goto out;
1346 }
1347
1348 BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
1349
1350 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
1351
1352 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1353 ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
1354 &bh, NULL);
1355 if (ret) {
1356 mlog_errno(ret);
1357 goto out;
1358 }
1359
1360 ret = ocfs2_journal_access(handle,
1361 INODE_CACHE(inode),
1362 bh,
1363 OCFS2_JOURNAL_ACCESS_WRITE);
1364 if (ret < 0) {
1365 mlog_errno(ret);
1366 goto out;
1367 }
1368
1369 cp_len = value_len > blocksize ? blocksize : value_len;
1370 memcpy(bh->b_data, value, cp_len);
1371 value_len -= cp_len;
1372 value += cp_len;
1373 if (cp_len < blocksize)
1374 memset(bh->b_data + cp_len, 0,
1375 blocksize - cp_len);
1376
1377 ret = ocfs2_journal_dirty(handle, bh);
1378 if (ret < 0) {
1379 mlog_errno(ret);
1380 goto out;
1381 }
1382 brelse(bh);
1383 bh = NULL;
1384
1385 /*
1386 * XXX: do we need to empty all the following
1387 * blocks in this cluster?
1388 */
1389 if (!value_len)
1390 break;
1391 }
1392 cpos += num_clusters;
1393 }
1394 out:
1395 brelse(bh);
1396
1397 return ret;
1398 }
1399
1400 static int ocfs2_xa_check_space_helper(int needed_space, int free_start,
1401 int num_entries)
1402 {
1403 int free_space;
1404
1405 if (!needed_space)
1406 return 0;
1407
1408 free_space = free_start -
1409 sizeof(struct ocfs2_xattr_header) -
1410 (num_entries * sizeof(struct ocfs2_xattr_entry)) -
1411 OCFS2_XATTR_HEADER_GAP;
1412 if (free_space < 0)
1413 return -EIO;
1414 if (free_space < needed_space)
1415 return -ENOSPC;
1416
1417 return 0;
1418 }
1419
1420 static int ocfs2_xa_journal_access(handle_t *handle, struct ocfs2_xa_loc *loc,
1421 int type)
1422 {
1423 return loc->xl_ops->xlo_journal_access(handle, loc, type);
1424 }
1425
1426 static void ocfs2_xa_journal_dirty(handle_t *handle, struct ocfs2_xa_loc *loc)
1427 {
1428 loc->xl_ops->xlo_journal_dirty(handle, loc);
1429 }
1430
1431 /* Give a pointer into the storage for the given offset */
1432 static void *ocfs2_xa_offset_pointer(struct ocfs2_xa_loc *loc, int offset)
1433 {
1434 BUG_ON(offset >= loc->xl_size);
1435 return loc->xl_ops->xlo_offset_pointer(loc, offset);
1436 }
1437
1438 /*
1439 * Wipe the name+value pair and allow the storage to reclaim it. This
1440 * must be followed by either removal of the entry or a call to
1441 * ocfs2_xa_add_namevalue().
1442 */
1443 static void ocfs2_xa_wipe_namevalue(struct ocfs2_xa_loc *loc)
1444 {
1445 loc->xl_ops->xlo_wipe_namevalue(loc);
1446 }
1447
1448 /*
1449 * Find lowest offset to a name+value pair. This is the start of our
1450 * downward-growing free space.
1451 */
1452 static int ocfs2_xa_get_free_start(struct ocfs2_xa_loc *loc)
1453 {
1454 return loc->xl_ops->xlo_get_free_start(loc);
1455 }
1456
1457 /* Can we reuse loc->xl_entry for xi? */
1458 static int ocfs2_xa_can_reuse_entry(struct ocfs2_xa_loc *loc,
1459 struct ocfs2_xattr_info *xi)
1460 {
1461 return loc->xl_ops->xlo_can_reuse(loc, xi);
1462 }
1463
1464 /* How much free space is needed to set the new value */
1465 static int ocfs2_xa_check_space(struct ocfs2_xa_loc *loc,
1466 struct ocfs2_xattr_info *xi)
1467 {
1468 return loc->xl_ops->xlo_check_space(loc, xi);
1469 }
1470
1471 static void ocfs2_xa_add_entry(struct ocfs2_xa_loc *loc, u32 name_hash)
1472 {
1473 loc->xl_ops->xlo_add_entry(loc, name_hash);
1474 loc->xl_entry->xe_name_hash = cpu_to_le32(name_hash);
1475 /*
1476 * We can't leave the new entry's xe_name_offset at zero or
1477 * add_namevalue() will go nuts. We set it to the size of our
1478 * storage so that it can never be less than any other entry.
1479 */
1480 loc->xl_entry->xe_name_offset = cpu_to_le16(loc->xl_size);
1481 }
1482
1483 static void ocfs2_xa_add_namevalue(struct ocfs2_xa_loc *loc,
1484 struct ocfs2_xattr_info *xi)
1485 {
1486 int size = namevalue_size_xi(xi);
1487 int nameval_offset;
1488 char *nameval_buf;
1489
1490 loc->xl_ops->xlo_add_namevalue(loc, size);
1491 loc->xl_entry->xe_value_size = cpu_to_le64(xi->xi_value_len);
1492 loc->xl_entry->xe_name_len = xi->xi_name_len;
1493 ocfs2_xattr_set_type(loc->xl_entry, xi->xi_name_index);
1494 ocfs2_xattr_set_local(loc->xl_entry,
1495 xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE);
1496
1497 nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1498 nameval_buf = ocfs2_xa_offset_pointer(loc, nameval_offset);
1499 memset(nameval_buf, 0, size);
1500 memcpy(nameval_buf, xi->xi_name, xi->xi_name_len);
1501 }
1502
1503 static void ocfs2_xa_fill_value_buf(struct ocfs2_xa_loc *loc,
1504 struct ocfs2_xattr_value_buf *vb)
1505 {
1506 int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1507 int name_size = OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len);
1508
1509 /* Value bufs are for value trees */
1510 BUG_ON(ocfs2_xattr_is_local(loc->xl_entry));
1511 BUG_ON(namevalue_size_xe(loc->xl_entry) !=
1512 (name_size + OCFS2_XATTR_ROOT_SIZE));
1513
1514 loc->xl_ops->xlo_fill_value_buf(loc, vb);
1515 vb->vb_xv =
1516 (struct ocfs2_xattr_value_root *)ocfs2_xa_offset_pointer(loc,
1517 nameval_offset +
1518 name_size);
1519 }
1520
1521 static int ocfs2_xa_block_journal_access(handle_t *handle,
1522 struct ocfs2_xa_loc *loc, int type)
1523 {
1524 struct buffer_head *bh = loc->xl_storage;
1525 ocfs2_journal_access_func access;
1526
1527 if (loc->xl_size == (bh->b_size -
1528 offsetof(struct ocfs2_xattr_block,
1529 xb_attrs.xb_header)))
1530 access = ocfs2_journal_access_xb;
1531 else
1532 access = ocfs2_journal_access_di;
1533 return access(handle, INODE_CACHE(loc->xl_inode), bh, type);
1534 }
1535
1536 static void ocfs2_xa_block_journal_dirty(handle_t *handle,
1537 struct ocfs2_xa_loc *loc)
1538 {
1539 struct buffer_head *bh = loc->xl_storage;
1540
1541 ocfs2_journal_dirty(handle, bh);
1542 }
1543
1544 static void *ocfs2_xa_block_offset_pointer(struct ocfs2_xa_loc *loc,
1545 int offset)
1546 {
1547 return (char *)loc->xl_header + offset;
1548 }
1549
1550 static int ocfs2_xa_block_can_reuse(struct ocfs2_xa_loc *loc,
1551 struct ocfs2_xattr_info *xi)
1552 {
1553 /*
1554 * Block storage is strict. If the sizes aren't exact, we will
1555 * remove the old one and reinsert the new.
1556 */
1557 return namevalue_size_xe(loc->xl_entry) ==
1558 namevalue_size_xi(xi);
1559 }
1560
1561 static int ocfs2_xa_block_get_free_start(struct ocfs2_xa_loc *loc)
1562 {
1563 struct ocfs2_xattr_header *xh = loc->xl_header;
1564 int i, count = le16_to_cpu(xh->xh_count);
1565 int offset, free_start = loc->xl_size;
1566
1567 for (i = 0; i < count; i++) {
1568 offset = le16_to_cpu(xh->xh_entries[i].xe_name_offset);
1569 if (offset < free_start)
1570 free_start = offset;
1571 }
1572
1573 return free_start;
1574 }
1575
1576 static int ocfs2_xa_block_check_space(struct ocfs2_xa_loc *loc,
1577 struct ocfs2_xattr_info *xi)
1578 {
1579 int count = le16_to_cpu(loc->xl_header->xh_count);
1580 int free_start = ocfs2_xa_get_free_start(loc);
1581 int needed_space = ocfs2_xi_entry_usage(xi);
1582
1583 /*
1584 * Block storage will reclaim the original entry before inserting
1585 * the new value, so we only need the difference. If the new
1586 * entry is smaller than the old one, we don't need anything.
1587 */
1588 if (loc->xl_entry) {
1589 /* Don't need space if we're reusing! */
1590 if (ocfs2_xa_can_reuse_entry(loc, xi))
1591 needed_space = 0;
1592 else
1593 needed_space -= ocfs2_xe_entry_usage(loc->xl_entry);
1594 }
1595 if (needed_space < 0)
1596 needed_space = 0;
1597 return ocfs2_xa_check_space_helper(needed_space, free_start, count);
1598 }
1599
1600 /*
1601 * Block storage for xattrs keeps the name+value pairs compacted. When
1602 * we remove one, we have to shift any that preceded it towards the end.
1603 */
1604 static void ocfs2_xa_block_wipe_namevalue(struct ocfs2_xa_loc *loc)
1605 {
1606 int i, offset;
1607 int namevalue_offset, first_namevalue_offset, namevalue_size;
1608 struct ocfs2_xattr_entry *entry = loc->xl_entry;
1609 struct ocfs2_xattr_header *xh = loc->xl_header;
1610 int count = le16_to_cpu(xh->xh_count);
1611
1612 namevalue_offset = le16_to_cpu(entry->xe_name_offset);
1613 namevalue_size = namevalue_size_xe(entry);
1614 first_namevalue_offset = ocfs2_xa_get_free_start(loc);
1615
1616 /* Shift the name+value pairs */
1617 memmove((char *)xh + first_namevalue_offset + namevalue_size,
1618 (char *)xh + first_namevalue_offset,
1619 namevalue_offset - first_namevalue_offset);
1620 memset((char *)xh + first_namevalue_offset, 0, namevalue_size);
1621
1622 /* Now tell xh->xh_entries about it */
1623 for (i = 0; i < count; i++) {
1624 offset = le16_to_cpu(xh->xh_entries[i].xe_name_offset);
1625 if (offset <= namevalue_offset)
1626 le16_add_cpu(&xh->xh_entries[i].xe_name_offset,
1627 namevalue_size);
1628 }
1629
1630 /*
1631 * Note that we don't update xh_free_start or xh_name_value_len
1632 * because they're not used in block-stored xattrs.
1633 */
1634 }
1635
1636 static void ocfs2_xa_block_add_entry(struct ocfs2_xa_loc *loc, u32 name_hash)
1637 {
1638 int count = le16_to_cpu(loc->xl_header->xh_count);
1639 loc->xl_entry = &(loc->xl_header->xh_entries[count]);
1640 le16_add_cpu(&loc->xl_header->xh_count, 1);
1641 memset(loc->xl_entry, 0, sizeof(struct ocfs2_xattr_entry));
1642 }
1643
1644 static void ocfs2_xa_block_add_namevalue(struct ocfs2_xa_loc *loc, int size)
1645 {
1646 int free_start = ocfs2_xa_get_free_start(loc);
1647
1648 loc->xl_entry->xe_name_offset = cpu_to_le16(free_start - size);
1649 }
1650
1651 static void ocfs2_xa_block_fill_value_buf(struct ocfs2_xa_loc *loc,
1652 struct ocfs2_xattr_value_buf *vb)
1653 {
1654 struct buffer_head *bh = loc->xl_storage;
1655
1656 if (loc->xl_size == (bh->b_size -
1657 offsetof(struct ocfs2_xattr_block,
1658 xb_attrs.xb_header)))
1659 vb->vb_access = ocfs2_journal_access_xb;
1660 else
1661 vb->vb_access = ocfs2_journal_access_di;
1662 vb->vb_bh = bh;
1663 }
1664
1665 /*
1666 * Operations for xattrs stored in blocks. This includes inline inode
1667 * storage and unindexed ocfs2_xattr_blocks.
1668 */
1669 static const struct ocfs2_xa_loc_operations ocfs2_xa_block_loc_ops = {
1670 .xlo_journal_access = ocfs2_xa_block_journal_access,
1671 .xlo_journal_dirty = ocfs2_xa_block_journal_dirty,
1672 .xlo_offset_pointer = ocfs2_xa_block_offset_pointer,
1673 .xlo_check_space = ocfs2_xa_block_check_space,
1674 .xlo_can_reuse = ocfs2_xa_block_can_reuse,
1675 .xlo_get_free_start = ocfs2_xa_block_get_free_start,
1676 .xlo_wipe_namevalue = ocfs2_xa_block_wipe_namevalue,
1677 .xlo_add_entry = ocfs2_xa_block_add_entry,
1678 .xlo_add_namevalue = ocfs2_xa_block_add_namevalue,
1679 .xlo_fill_value_buf = ocfs2_xa_block_fill_value_buf,
1680 };
1681
1682 static int ocfs2_xa_bucket_journal_access(handle_t *handle,
1683 struct ocfs2_xa_loc *loc, int type)
1684 {
1685 struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1686
1687 return ocfs2_xattr_bucket_journal_access(handle, bucket, type);
1688 }
1689
1690 static void ocfs2_xa_bucket_journal_dirty(handle_t *handle,
1691 struct ocfs2_xa_loc *loc)
1692 {
1693 struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1694
1695 ocfs2_xattr_bucket_journal_dirty(handle, bucket);
1696 }
1697
1698 static void *ocfs2_xa_bucket_offset_pointer(struct ocfs2_xa_loc *loc,
1699 int offset)
1700 {
1701 struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1702 int block, block_offset;
1703
1704 /* The header is at the front of the bucket */
1705 block = offset >> loc->xl_inode->i_sb->s_blocksize_bits;
1706 block_offset = offset % loc->xl_inode->i_sb->s_blocksize;
1707
1708 return bucket_block(bucket, block) + block_offset;
1709 }
1710
1711 static int ocfs2_xa_bucket_can_reuse(struct ocfs2_xa_loc *loc,
1712 struct ocfs2_xattr_info *xi)
1713 {
1714 return namevalue_size_xe(loc->xl_entry) >=
1715 namevalue_size_xi(xi);
1716 }
1717
1718 static int ocfs2_xa_bucket_get_free_start(struct ocfs2_xa_loc *loc)
1719 {
1720 struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1721 return le16_to_cpu(bucket_xh(bucket)->xh_free_start);
1722 }
1723
1724 static int ocfs2_bucket_align_free_start(struct super_block *sb,
1725 int free_start, int size)
1726 {
1727 /*
1728 * We need to make sure that the name+value pair fits within
1729 * one block.
1730 */
1731 if (((free_start - size) >> sb->s_blocksize_bits) !=
1732 ((free_start - 1) >> sb->s_blocksize_bits))
1733 free_start -= free_start % sb->s_blocksize;
1734
1735 return free_start;
1736 }
1737
1738 static int ocfs2_xa_bucket_check_space(struct ocfs2_xa_loc *loc,
1739 struct ocfs2_xattr_info *xi)
1740 {
1741 int rc;
1742 int count = le16_to_cpu(loc->xl_header->xh_count);
1743 int free_start = ocfs2_xa_get_free_start(loc);
1744 int needed_space = ocfs2_xi_entry_usage(xi);
1745 int size = namevalue_size_xi(xi);
1746 struct super_block *sb = loc->xl_inode->i_sb;
1747
1748 /*
1749 * Bucket storage does not reclaim name+value pairs it cannot
1750 * reuse. They live as holes until the bucket fills, and then
1751 * the bucket is defragmented. However, the bucket can reclaim
1752 * the ocfs2_xattr_entry.
1753 */
1754 if (loc->xl_entry) {
1755 /* Don't need space if we're reusing! */
1756 if (ocfs2_xa_can_reuse_entry(loc, xi))
1757 needed_space = 0;
1758 else
1759 needed_space -= sizeof(struct ocfs2_xattr_entry);
1760 }
1761 BUG_ON(needed_space < 0);
1762
1763 if (free_start < size) {
1764 if (needed_space)
1765 return -ENOSPC;
1766 } else {
1767 /*
1768 * First we check if it would fit in the first place.
1769 * Below, we align the free start to a block. This may
1770 * slide us below the minimum gap. By checking unaligned
1771 * first, we avoid that error.
1772 */
1773 rc = ocfs2_xa_check_space_helper(needed_space, free_start,
1774 count);
1775 if (rc)
1776 return rc;
1777 free_start = ocfs2_bucket_align_free_start(sb, free_start,
1778 size);
1779 }
1780 return ocfs2_xa_check_space_helper(needed_space, free_start, count);
1781 }
1782
1783 static void ocfs2_xa_bucket_wipe_namevalue(struct ocfs2_xa_loc *loc)
1784 {
1785 le16_add_cpu(&loc->xl_header->xh_name_value_len,
1786 -namevalue_size_xe(loc->xl_entry));
1787 }
1788
1789 static void ocfs2_xa_bucket_add_entry(struct ocfs2_xa_loc *loc, u32 name_hash)
1790 {
1791 struct ocfs2_xattr_header *xh = loc->xl_header;
1792 int count = le16_to_cpu(xh->xh_count);
1793 int low = 0, high = count - 1, tmp;
1794 struct ocfs2_xattr_entry *tmp_xe;
1795
1796 /*
1797 * We keep buckets sorted by name_hash, so we need to find
1798 * our insert place.
1799 */
1800 while (low <= high && count) {
1801 tmp = (low + high) / 2;
1802 tmp_xe = &xh->xh_entries[tmp];
1803
1804 if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
1805 low = tmp + 1;
1806 else if (name_hash < le32_to_cpu(tmp_xe->xe_name_hash))
1807 high = tmp - 1;
1808 else {
1809 low = tmp;
1810 break;
1811 }
1812 }
1813
1814 if (low != count)
1815 memmove(&xh->xh_entries[low + 1],
1816 &xh->xh_entries[low],
1817 ((count - low) * sizeof(struct ocfs2_xattr_entry)));
1818
1819 le16_add_cpu(&xh->xh_count, 1);
1820 loc->xl_entry = &xh->xh_entries[low];
1821 memset(loc->xl_entry, 0, sizeof(struct ocfs2_xattr_entry));
1822 }
1823
1824 static void ocfs2_xa_bucket_add_namevalue(struct ocfs2_xa_loc *loc, int size)
1825 {
1826 int free_start = ocfs2_xa_get_free_start(loc);
1827 struct ocfs2_xattr_header *xh = loc->xl_header;
1828 struct super_block *sb = loc->xl_inode->i_sb;
1829 int nameval_offset;
1830
1831 free_start = ocfs2_bucket_align_free_start(sb, free_start, size);
1832 nameval_offset = free_start - size;
1833 loc->xl_entry->xe_name_offset = cpu_to_le16(nameval_offset);
1834 xh->xh_free_start = cpu_to_le16(nameval_offset);
1835 le16_add_cpu(&xh->xh_name_value_len, size);
1836
1837 }
1838
1839 static void ocfs2_xa_bucket_fill_value_buf(struct ocfs2_xa_loc *loc,
1840 struct ocfs2_xattr_value_buf *vb)
1841 {
1842 struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1843 struct super_block *sb = loc->xl_inode->i_sb;
1844 int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1845 int size = namevalue_size_xe(loc->xl_entry);
1846 int block_offset = nameval_offset >> sb->s_blocksize_bits;
1847
1848 /* Values are not allowed to straddle block boundaries */
1849 BUG_ON(block_offset !=
1850 ((nameval_offset + size - 1) >> sb->s_blocksize_bits));
1851 /* We expect the bucket to be filled in */
1852 BUG_ON(!bucket->bu_bhs[block_offset]);
1853
1854 vb->vb_access = ocfs2_journal_access;
1855 vb->vb_bh = bucket->bu_bhs[block_offset];
1856 }
1857
1858 /* Operations for xattrs stored in buckets. */
1859 static const struct ocfs2_xa_loc_operations ocfs2_xa_bucket_loc_ops = {
1860 .xlo_journal_access = ocfs2_xa_bucket_journal_access,
1861 .xlo_journal_dirty = ocfs2_xa_bucket_journal_dirty,
1862 .xlo_offset_pointer = ocfs2_xa_bucket_offset_pointer,
1863 .xlo_check_space = ocfs2_xa_bucket_check_space,
1864 .xlo_can_reuse = ocfs2_xa_bucket_can_reuse,
1865 .xlo_get_free_start = ocfs2_xa_bucket_get_free_start,
1866 .xlo_wipe_namevalue = ocfs2_xa_bucket_wipe_namevalue,
1867 .xlo_add_entry = ocfs2_xa_bucket_add_entry,
1868 .xlo_add_namevalue = ocfs2_xa_bucket_add_namevalue,
1869 .xlo_fill_value_buf = ocfs2_xa_bucket_fill_value_buf,
1870 };
1871
1872 static unsigned int ocfs2_xa_value_clusters(struct ocfs2_xa_loc *loc)
1873 {
1874 struct ocfs2_xattr_value_buf vb;
1875
1876 if (ocfs2_xattr_is_local(loc->xl_entry))
1877 return 0;
1878
1879 ocfs2_xa_fill_value_buf(loc, &vb);
1880 return le32_to_cpu(vb.vb_xv->xr_clusters);
1881 }
1882
1883 static int ocfs2_xa_value_truncate(struct ocfs2_xa_loc *loc, u64 bytes,
1884 struct ocfs2_xattr_set_ctxt *ctxt)
1885 {
1886 int trunc_rc, access_rc;
1887 struct ocfs2_xattr_value_buf vb;
1888
1889 ocfs2_xa_fill_value_buf(loc, &vb);
1890 trunc_rc = ocfs2_xattr_value_truncate(loc->xl_inode, &vb, bytes,
1891 ctxt);
1892
1893 /*
1894 * The caller of ocfs2_xa_value_truncate() has already called
1895 * ocfs2_xa_journal_access on the loc. However, The truncate code
1896 * calls ocfs2_extend_trans(). This may commit the previous
1897 * transaction and open a new one. If this is a bucket, truncate
1898 * could leave only vb->vb_bh set up for journaling. Meanwhile,
1899 * the caller is expecting to dirty the entire bucket. So we must
1900 * reset the journal work. We do this even if truncate has failed,
1901 * as it could have failed after committing the extend.
1902 */
1903 access_rc = ocfs2_xa_journal_access(ctxt->handle, loc,
1904 OCFS2_JOURNAL_ACCESS_WRITE);
1905
1906 /* Errors in truncate take precedence */
1907 return trunc_rc ? trunc_rc : access_rc;
1908 }
1909
1910 static void ocfs2_xa_remove_entry(struct ocfs2_xa_loc *loc)
1911 {
1912 int index, count;
1913 struct ocfs2_xattr_header *xh = loc->xl_header;
1914 struct ocfs2_xattr_entry *entry = loc->xl_entry;
1915
1916 ocfs2_xa_wipe_namevalue(loc);
1917 loc->xl_entry = NULL;
1918
1919 le16_add_cpu(&xh->xh_count, -1);
1920 count = le16_to_cpu(xh->xh_count);
1921
1922 /*
1923 * Only zero out the entry if there are more remaining. This is
1924 * important for an empty bucket, as it keeps track of the
1925 * bucket's hash value. It doesn't hurt empty block storage.
1926 */
1927 if (count) {
1928 index = ((char *)entry - (char *)&xh->xh_entries) /
1929 sizeof(struct ocfs2_xattr_entry);
1930 memmove(&xh->xh_entries[index], &xh->xh_entries[index + 1],
1931 (count - index) * sizeof(struct ocfs2_xattr_entry));
1932 memset(&xh->xh_entries[count], 0,
1933 sizeof(struct ocfs2_xattr_entry));
1934 }
1935 }
1936
1937 /*
1938 * If we have a problem adjusting the size of an external value during
1939 * ocfs2_xa_prepare_entry() or ocfs2_xa_remove(), we may have an xattr
1940 * in an intermediate state. For example, the value may be partially
1941 * truncated.
1942 *
1943 * If the value tree hasn't changed, the extend/truncate went nowhere.
1944 * We have nothing to do. The caller can treat it as a straight error.
1945 *
1946 * If the value tree got partially truncated, we now have a corrupted
1947 * extended attribute. We're going to wipe its entry and leak the
1948 * clusters. Better to leak some storage than leave a corrupt entry.
1949 *
1950 * If the value tree grew, it obviously didn't grow enough for the
1951 * new entry. We're not going to try and reclaim those clusters either.
1952 * If there was already an external value there (orig_clusters != 0),
1953 * the new clusters are attached safely and we can just leave the old
1954 * value in place. If there was no external value there, we remove
1955 * the entry.
1956 *
1957 * This way, the xattr block we store in the journal will be consistent.
1958 * If the size change broke because of the journal, no changes will hit
1959 * disk anyway.
1960 */
1961 static void ocfs2_xa_cleanup_value_truncate(struct ocfs2_xa_loc *loc,
1962 const char *what,
1963 unsigned int orig_clusters)
1964 {
1965 unsigned int new_clusters = ocfs2_xa_value_clusters(loc);
1966 char *nameval_buf = ocfs2_xa_offset_pointer(loc,
1967 le16_to_cpu(loc->xl_entry->xe_name_offset));
1968
1969 if (new_clusters < orig_clusters) {
1970 mlog(ML_ERROR,
1971 "Partial truncate while %s xattr %.*s. Leaking "
1972 "%u clusters and removing the entry\n",
1973 what, loc->xl_entry->xe_name_len, nameval_buf,
1974 orig_clusters - new_clusters);
1975 ocfs2_xa_remove_entry(loc);
1976 } else if (!orig_clusters) {
1977 mlog(ML_ERROR,
1978 "Unable to allocate an external value for xattr "
1979 "%.*s safely. Leaking %u clusters and removing the "
1980 "entry\n",
1981 loc->xl_entry->xe_name_len, nameval_buf,
1982 new_clusters - orig_clusters);
1983 ocfs2_xa_remove_entry(loc);
1984 } else if (new_clusters > orig_clusters)
1985 mlog(ML_ERROR,
1986 "Unable to grow xattr %.*s safely. %u new clusters "
1987 "have been added, but the value will not be "
1988 "modified\n",
1989 loc->xl_entry->xe_name_len, nameval_buf,
1990 new_clusters - orig_clusters);
1991 }
1992
1993 static int ocfs2_xa_remove(struct ocfs2_xa_loc *loc,
1994 struct ocfs2_xattr_set_ctxt *ctxt)
1995 {
1996 int rc = 0;
1997 unsigned int orig_clusters;
1998
1999 if (!ocfs2_xattr_is_local(loc->xl_entry)) {
2000 orig_clusters = ocfs2_xa_value_clusters(loc);
2001 rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2002 if (rc) {
2003 mlog_errno(rc);
2004 /*
2005 * Since this is remove, we can return 0 if
2006 * ocfs2_xa_cleanup_value_truncate() is going to
2007 * wipe the entry anyway. So we check the
2008 * cluster count as well.
2009 */
2010 if (orig_clusters != ocfs2_xa_value_clusters(loc))
2011 rc = 0;
2012 ocfs2_xa_cleanup_value_truncate(loc, "removing",
2013 orig_clusters);
2014 if (rc)
2015 goto out;
2016 }
2017 }
2018
2019 ocfs2_xa_remove_entry(loc);
2020
2021 out:
2022 return rc;
2023 }
2024
2025 static void ocfs2_xa_install_value_root(struct ocfs2_xa_loc *loc)
2026 {
2027 int name_size = OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len);
2028 char *nameval_buf;
2029
2030 nameval_buf = ocfs2_xa_offset_pointer(loc,
2031 le16_to_cpu(loc->xl_entry->xe_name_offset));
2032 memcpy(nameval_buf + name_size, &def_xv, OCFS2_XATTR_ROOT_SIZE);
2033 }
2034
2035 /*
2036 * Take an existing entry and make it ready for the new value. This
2037 * won't allocate space, but it may free space. It should be ready for
2038 * ocfs2_xa_prepare_entry() to finish the work.
2039 */
2040 static int ocfs2_xa_reuse_entry(struct ocfs2_xa_loc *loc,
2041 struct ocfs2_xattr_info *xi,
2042 struct ocfs2_xattr_set_ctxt *ctxt)
2043 {
2044 int rc = 0;
2045 int name_size = OCFS2_XATTR_SIZE(xi->xi_name_len);
2046 unsigned int orig_clusters;
2047 char *nameval_buf;
2048 int xe_local = ocfs2_xattr_is_local(loc->xl_entry);
2049 int xi_local = xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE;
2050
2051 BUG_ON(OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len) !=
2052 name_size);
2053
2054 nameval_buf = ocfs2_xa_offset_pointer(loc,
2055 le16_to_cpu(loc->xl_entry->xe_name_offset));
2056 if (xe_local) {
2057 memset(nameval_buf + name_size, 0,
2058 namevalue_size_xe(loc->xl_entry) - name_size);
2059 if (!xi_local)
2060 ocfs2_xa_install_value_root(loc);
2061 } else {
2062 orig_clusters = ocfs2_xa_value_clusters(loc);
2063 if (xi_local) {
2064 rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2065 if (rc < 0)
2066 mlog_errno(rc);
2067 else
2068 memset(nameval_buf + name_size, 0,
2069 namevalue_size_xe(loc->xl_entry) -
2070 name_size);
2071 } else if (le64_to_cpu(loc->xl_entry->xe_value_size) >
2072 xi->xi_value_len) {
2073 rc = ocfs2_xa_value_truncate(loc, xi->xi_value_len,
2074 ctxt);
2075 if (rc < 0)
2076 mlog_errno(rc);
2077 }
2078
2079 if (rc) {
2080 ocfs2_xa_cleanup_value_truncate(loc, "reusing",
2081 orig_clusters);
2082 goto out;
2083 }
2084 }
2085
2086 loc->xl_entry->xe_value_size = cpu_to_le64(xi->xi_value_len);
2087 ocfs2_xattr_set_local(loc->xl_entry, xi_local);
2088
2089 out:
2090 return rc;
2091 }
2092
2093 /*
2094 * Prepares loc->xl_entry to receive the new xattr. This includes
2095 * properly setting up the name+value pair region. If loc->xl_entry
2096 * already exists, it will take care of modifying it appropriately.
2097 *
2098 * Note that this modifies the data. You did journal_access already,
2099 * right?
2100 */
2101 static int ocfs2_xa_prepare_entry(struct ocfs2_xa_loc *loc,
2102 struct ocfs2_xattr_info *xi,
2103 u32 name_hash,
2104 struct ocfs2_xattr_set_ctxt *ctxt)
2105 {
2106 int rc = 0;
2107 unsigned int orig_clusters;
2108 __le64 orig_value_size = 0;
2109
2110 rc = ocfs2_xa_check_space(loc, xi);
2111 if (rc)
2112 goto out;
2113
2114 if (loc->xl_entry) {
2115 if (ocfs2_xa_can_reuse_entry(loc, xi)) {
2116 orig_value_size = loc->xl_entry->xe_value_size;
2117 rc = ocfs2_xa_reuse_entry(loc, xi, ctxt);
2118 if (rc)
2119 goto out;
2120 goto alloc_value;
2121 }
2122
2123 if (!ocfs2_xattr_is_local(loc->xl_entry)) {
2124 orig_clusters = ocfs2_xa_value_clusters(loc);
2125 rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2126 if (rc) {
2127 mlog_errno(rc);
2128 ocfs2_xa_cleanup_value_truncate(loc,
2129 "overwriting",
2130 orig_clusters);
2131 goto out;
2132 }
2133 }
2134 ocfs2_xa_wipe_namevalue(loc);
2135 } else
2136 ocfs2_xa_add_entry(loc, name_hash);
2137
2138 /*
2139 * If we get here, we have a blank entry. Fill it. We grow our
2140 * name+value pair back from the end.
2141 */
2142 ocfs2_xa_add_namevalue(loc, xi);
2143 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE)
2144 ocfs2_xa_install_value_root(loc);
2145
2146 alloc_value:
2147 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
2148 orig_clusters = ocfs2_xa_value_clusters(loc);
2149 rc = ocfs2_xa_value_truncate(loc, xi->xi_value_len, ctxt);
2150 if (rc < 0) {
2151 /*
2152 * If we tried to grow an existing external value,
2153 * ocfs2_xa_cleanuP-value_truncate() is going to
2154 * let it stand. We have to restore its original
2155 * value size.
2156 */
2157 loc->xl_entry->xe_value_size = orig_value_size;
2158 ocfs2_xa_cleanup_value_truncate(loc, "growing",
2159 orig_clusters);
2160 mlog_errno(rc);
2161 }
2162 }
2163
2164 out:
2165 return rc;
2166 }
2167
2168 /*
2169 * Store the value portion of the name+value pair. This will skip
2170 * values that are stored externally. Their tree roots were set up
2171 * by ocfs2_xa_prepare_entry().
2172 */
2173 static int ocfs2_xa_store_value(struct ocfs2_xa_loc *loc,
2174 struct ocfs2_xattr_info *xi,
2175 struct ocfs2_xattr_set_ctxt *ctxt)
2176 {
2177 int rc = 0;
2178 int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
2179 int name_size = OCFS2_XATTR_SIZE(xi->xi_name_len);
2180 char *nameval_buf;
2181 struct ocfs2_xattr_value_buf vb;
2182
2183 nameval_buf = ocfs2_xa_offset_pointer(loc, nameval_offset);
2184 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
2185 ocfs2_xa_fill_value_buf(loc, &vb);
2186 rc = __ocfs2_xattr_set_value_outside(loc->xl_inode,
2187 ctxt->handle, &vb,
2188 xi->xi_value,
2189 xi->xi_value_len);
2190 } else
2191 memcpy(nameval_buf + name_size, xi->xi_value, xi->xi_value_len);
2192
2193 return rc;
2194 }
2195
2196 static int ocfs2_xa_set(struct ocfs2_xa_loc *loc,
2197 struct ocfs2_xattr_info *xi,
2198 struct ocfs2_xattr_set_ctxt *ctxt)
2199 {
2200 int ret;
2201 u32 name_hash = ocfs2_xattr_name_hash(loc->xl_inode, xi->xi_name,
2202 xi->xi_name_len);
2203
2204 ret = ocfs2_xa_journal_access(ctxt->handle, loc,
2205 OCFS2_JOURNAL_ACCESS_WRITE);
2206 if (ret) {
2207 mlog_errno(ret);
2208 goto out;
2209 }
2210
2211 /*
2212 * From here on out, everything is going to modify the buffer a
2213 * little. Errors are going to leave the xattr header in a
2214 * sane state. Thus, even with errors we dirty the sucker.
2215 */
2216
2217 /* Don't worry, we are never called with !xi_value and !xl_entry */
2218 if (!xi->xi_value) {
2219 ret = ocfs2_xa_remove(loc, ctxt);
2220 goto out_dirty;
2221 }
2222
2223 ret = ocfs2_xa_prepare_entry(loc, xi, name_hash, ctxt);
2224 if (ret) {
2225 if (ret != -ENOSPC)
2226 mlog_errno(ret);
2227 goto out_dirty;
2228 }
2229
2230 ret = ocfs2_xa_store_value(loc, xi, ctxt);
2231 if (ret)
2232 mlog_errno(ret);
2233
2234 out_dirty:
2235 ocfs2_xa_journal_dirty(ctxt->handle, loc);
2236
2237 out:
2238 return ret;
2239 }
2240
2241 static void ocfs2_init_dinode_xa_loc(struct ocfs2_xa_loc *loc,
2242 struct inode *inode,
2243 struct buffer_head *bh,
2244 struct ocfs2_xattr_entry *entry)
2245 {
2246 struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
2247
2248 BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_XATTR_FL));
2249
2250 loc->xl_inode = inode;
2251 loc->xl_ops = &ocfs2_xa_block_loc_ops;
2252 loc->xl_storage = bh;
2253 loc->xl_entry = entry;
2254 loc->xl_size = le16_to_cpu(di->i_xattr_inline_size);
2255 loc->xl_header =
2256 (struct ocfs2_xattr_header *)(bh->b_data + bh->b_size -
2257 loc->xl_size);
2258 }
2259
2260 static void ocfs2_init_xattr_block_xa_loc(struct ocfs2_xa_loc *loc,
2261 struct inode *inode,
2262 struct buffer_head *bh,
2263 struct ocfs2_xattr_entry *entry)
2264 {
2265 struct ocfs2_xattr_block *xb =
2266 (struct ocfs2_xattr_block *)bh->b_data;
2267
2268 BUG_ON(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED);
2269
2270 loc->xl_inode = inode;
2271 loc->xl_ops = &ocfs2_xa_block_loc_ops;
2272 loc->xl_storage = bh;
2273 loc->xl_header = &(xb->xb_attrs.xb_header);
2274 loc->xl_entry = entry;
2275 loc->xl_size = bh->b_size - offsetof(struct ocfs2_xattr_block,
2276 xb_attrs.xb_header);
2277 }
2278
2279 static void ocfs2_init_xattr_bucket_xa_loc(struct ocfs2_xa_loc *loc,
2280 struct ocfs2_xattr_bucket *bucket,
2281 struct ocfs2_xattr_entry *entry)
2282 {
2283 loc->xl_inode = bucket->bu_inode;
2284 loc->xl_ops = &ocfs2_xa_bucket_loc_ops;
2285 loc->xl_storage = bucket;
2286 loc->xl_header = bucket_xh(bucket);
2287 loc->xl_entry = entry;
2288 loc->xl_size = OCFS2_XATTR_BUCKET_SIZE;
2289 }
2290
2291 /*
2292 * In xattr remove, if it is stored outside and refcounted, we may have
2293 * the chance to split the refcount tree. So need the allocators.
2294 */
2295 static int ocfs2_lock_xattr_remove_allocators(struct inode *inode,
2296 struct ocfs2_xattr_value_root *xv,
2297 struct ocfs2_caching_info *ref_ci,
2298 struct buffer_head *ref_root_bh,
2299 struct ocfs2_alloc_context **meta_ac,
2300 int *ref_credits)
2301 {
2302 int ret, meta_add = 0;
2303 u32 p_cluster, num_clusters;
2304 unsigned int ext_flags;
2305
2306 *ref_credits = 0;
2307 ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
2308 &num_clusters,
2309 &xv->xr_list,
2310 &ext_flags);
2311 if (ret) {
2312 mlog_errno(ret);
2313 goto out;
2314 }
2315
2316 if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
2317 goto out;
2318
2319 ret = ocfs2_refcounted_xattr_delete_need(inode, ref_ci,
2320 ref_root_bh, xv,
2321 &meta_add, ref_credits);
2322 if (ret) {
2323 mlog_errno(ret);
2324 goto out;
2325 }
2326
2327 ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb),
2328 meta_add, meta_ac);
2329 if (ret)
2330 mlog_errno(ret);
2331
2332 out:
2333 return ret;
2334 }
2335
2336 static int ocfs2_remove_value_outside(struct inode*inode,
2337 struct ocfs2_xattr_value_buf *vb,
2338 struct ocfs2_xattr_header *header,
2339 struct ocfs2_caching_info *ref_ci,
2340 struct buffer_head *ref_root_bh)
2341 {
2342 int ret = 0, i, ref_credits;
2343 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2344 struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
2345 void *val;
2346
2347 ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
2348
2349 for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
2350 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
2351
2352 if (ocfs2_xattr_is_local(entry))
2353 continue;
2354
2355 val = (void *)header +
2356 le16_to_cpu(entry->xe_name_offset);
2357 vb->vb_xv = (struct ocfs2_xattr_value_root *)
2358 (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
2359
2360 ret = ocfs2_lock_xattr_remove_allocators(inode, vb->vb_xv,
2361 ref_ci, ref_root_bh,
2362 &ctxt.meta_ac,
2363 &ref_credits);
2364
2365 ctxt.handle = ocfs2_start_trans(osb, ref_credits +
2366 ocfs2_remove_extent_credits(osb->sb));
2367 if (IS_ERR(ctxt.handle)) {
2368 ret = PTR_ERR(ctxt.handle);
2369 mlog_errno(ret);
2370 break;
2371 }
2372
2373 ret = ocfs2_xattr_value_truncate(inode, vb, 0, &ctxt);
2374 if (ret < 0) {
2375 mlog_errno(ret);
2376 break;
2377 }
2378
2379 ocfs2_commit_trans(osb, ctxt.handle);
2380 if (ctxt.meta_ac) {
2381 ocfs2_free_alloc_context(ctxt.meta_ac);
2382 ctxt.meta_ac = NULL;
2383 }
2384 }
2385
2386 if (ctxt.meta_ac)
2387 ocfs2_free_alloc_context(ctxt.meta_ac);
2388 ocfs2_schedule_truncate_log_flush(osb, 1);
2389 ocfs2_run_deallocs(osb, &ctxt.dealloc);
2390 return ret;
2391 }
2392
2393 static int ocfs2_xattr_ibody_remove(struct inode *inode,
2394 struct buffer_head *di_bh,
2395 struct ocfs2_caching_info *ref_ci,
2396 struct buffer_head *ref_root_bh)
2397 {
2398
2399 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2400 struct ocfs2_xattr_header *header;
2401 int ret;
2402 struct ocfs2_xattr_value_buf vb = {
2403 .vb_bh = di_bh,
2404 .vb_access = ocfs2_journal_access_di,
2405 };
2406
2407 header = (struct ocfs2_xattr_header *)
2408 ((void *)di + inode->i_sb->s_blocksize -
2409 le16_to_cpu(di->i_xattr_inline_size));
2410
2411 ret = ocfs2_remove_value_outside(inode, &vb, header,
2412 ref_ci, ref_root_bh);
2413
2414 return ret;
2415 }
2416
2417 struct ocfs2_rm_xattr_bucket_para {
2418 struct ocfs2_caching_info *ref_ci;
2419 struct buffer_head *ref_root_bh;
2420 };
2421
2422 static int ocfs2_xattr_block_remove(struct inode *inode,
2423 struct buffer_head *blk_bh,
2424 struct ocfs2_caching_info *ref_ci,
2425 struct buffer_head *ref_root_bh)
2426 {
2427 struct ocfs2_xattr_block *xb;
2428 int ret = 0;
2429 struct ocfs2_xattr_value_buf vb = {
2430 .vb_bh = blk_bh,
2431 .vb_access = ocfs2_journal_access_xb,
2432 };
2433 struct ocfs2_rm_xattr_bucket_para args = {
2434 .ref_ci = ref_ci,
2435 .ref_root_bh = ref_root_bh,
2436 };
2437
2438 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2439 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2440 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
2441 ret = ocfs2_remove_value_outside(inode, &vb, header,
2442 ref_ci, ref_root_bh);
2443 } else
2444 ret = ocfs2_iterate_xattr_index_block(inode,
2445 blk_bh,
2446 ocfs2_rm_xattr_cluster,
2447 &args);
2448
2449 return ret;
2450 }
2451
2452 static int ocfs2_xattr_free_block(struct inode *inode,
2453 u64 block,
2454 struct ocfs2_caching_info *ref_ci,
2455 struct buffer_head *ref_root_bh)
2456 {
2457 struct inode *xb_alloc_inode;
2458 struct buffer_head *xb_alloc_bh = NULL;
2459 struct buffer_head *blk_bh = NULL;
2460 struct ocfs2_xattr_block *xb;
2461 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2462 handle_t *handle;
2463 int ret = 0;
2464 u64 blk, bg_blkno;
2465 u16 bit;
2466
2467 ret = ocfs2_read_xattr_block(inode, block, &blk_bh);
2468 if (ret < 0) {
2469 mlog_errno(ret);
2470 goto out;
2471 }
2472
2473 ret = ocfs2_xattr_block_remove(inode, blk_bh, ref_ci, ref_root_bh);
2474 if (ret < 0) {
2475 mlog_errno(ret);
2476 goto out;
2477 }
2478
2479 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2480 blk = le64_to_cpu(xb->xb_blkno);
2481 bit = le16_to_cpu(xb->xb_suballoc_bit);
2482 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
2483
2484 xb_alloc_inode = ocfs2_get_system_file_inode(osb,
2485 EXTENT_ALLOC_SYSTEM_INODE,
2486 le16_to_cpu(xb->xb_suballoc_slot));
2487 if (!xb_alloc_inode) {
2488 ret = -ENOMEM;
2489 mlog_errno(ret);
2490 goto out;
2491 }
2492 mutex_lock(&xb_alloc_inode->i_mutex);
2493
2494 ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
2495 if (ret < 0) {
2496 mlog_errno(ret);
2497 goto out_mutex;
2498 }
2499
2500 handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
2501 if (IS_ERR(handle)) {
2502 ret = PTR_ERR(handle);
2503 mlog_errno(ret);
2504 goto out_unlock;
2505 }
2506
2507 ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
2508 bit, bg_blkno, 1);
2509 if (ret < 0)
2510 mlog_errno(ret);
2511
2512 ocfs2_commit_trans(osb, handle);
2513 out_unlock:
2514 ocfs2_inode_unlock(xb_alloc_inode, 1);
2515 brelse(xb_alloc_bh);
2516 out_mutex:
2517 mutex_unlock(&xb_alloc_inode->i_mutex);
2518 iput(xb_alloc_inode);
2519 out:
2520 brelse(blk_bh);
2521 return ret;
2522 }
2523
2524 /*
2525 * ocfs2_xattr_remove()
2526 *
2527 * Free extended attribute resources associated with this inode.
2528 */
2529 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
2530 {
2531 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2532 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2533 struct ocfs2_refcount_tree *ref_tree = NULL;
2534 struct buffer_head *ref_root_bh = NULL;
2535 struct ocfs2_caching_info *ref_ci = NULL;
2536 handle_t *handle;
2537 int ret;
2538
2539 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2540 return 0;
2541
2542 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
2543 return 0;
2544
2545 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) {
2546 ret = ocfs2_lock_refcount_tree(OCFS2_SB(inode->i_sb),
2547 le64_to_cpu(di->i_refcount_loc),
2548 1, &ref_tree, &ref_root_bh);
2549 if (ret) {
2550 mlog_errno(ret);
2551 goto out;
2552 }
2553 ref_ci = &ref_tree->rf_ci;
2554
2555 }
2556
2557 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2558 ret = ocfs2_xattr_ibody_remove(inode, di_bh,
2559 ref_ci, ref_root_bh);
2560 if (ret < 0) {
2561 mlog_errno(ret);
2562 goto out;
2563 }
2564 }
2565
2566 if (di->i_xattr_loc) {
2567 ret = ocfs2_xattr_free_block(inode,
2568 le64_to_cpu(di->i_xattr_loc),
2569 ref_ci, ref_root_bh);
2570 if (ret < 0) {
2571 mlog_errno(ret);
2572 goto out;
2573 }
2574 }
2575
2576 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
2577 OCFS2_INODE_UPDATE_CREDITS);
2578 if (IS_ERR(handle)) {
2579 ret = PTR_ERR(handle);
2580 mlog_errno(ret);
2581 goto out;
2582 }
2583 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
2584 OCFS2_JOURNAL_ACCESS_WRITE);
2585 if (ret) {
2586 mlog_errno(ret);
2587 goto out_commit;
2588 }
2589
2590 di->i_xattr_loc = 0;
2591
2592 spin_lock(&oi->ip_lock);
2593 oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
2594 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
2595 spin_unlock(&oi->ip_lock);
2596
2597 ret = ocfs2_journal_dirty(handle, di_bh);
2598 if (ret < 0)
2599 mlog_errno(ret);
2600 out_commit:
2601 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
2602 out:
2603 if (ref_tree)
2604 ocfs2_unlock_refcount_tree(OCFS2_SB(inode->i_sb), ref_tree, 1);
2605 brelse(ref_root_bh);
2606 return ret;
2607 }
2608
2609 static int ocfs2_xattr_has_space_inline(struct inode *inode,
2610 struct ocfs2_dinode *di)
2611 {
2612 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2613 unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
2614 int free;
2615
2616 if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
2617 return 0;
2618
2619 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2620 struct ocfs2_inline_data *idata = &di->id2.i_data;
2621 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
2622 } else if (ocfs2_inode_is_fast_symlink(inode)) {
2623 free = ocfs2_fast_symlink_chars(inode->i_sb) -
2624 le64_to_cpu(di->i_size);
2625 } else {
2626 struct ocfs2_extent_list *el = &di->id2.i_list;
2627 free = (le16_to_cpu(el->l_count) -
2628 le16_to_cpu(el->l_next_free_rec)) *
2629 sizeof(struct ocfs2_extent_rec);
2630 }
2631 if (free >= xattrsize)
2632 return 1;
2633
2634 return 0;
2635 }
2636
2637 /*
2638 * ocfs2_xattr_ibody_find()
2639 *
2640 * Find extended attribute in inode block and
2641 * fill search info into struct ocfs2_xattr_search.
2642 */
2643 static int ocfs2_xattr_ibody_find(struct inode *inode,
2644 int name_index,
2645 const char *name,
2646 struct ocfs2_xattr_search *xs)
2647 {
2648 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2649 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2650 int ret;
2651 int has_space = 0;
2652
2653 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2654 return 0;
2655
2656 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2657 down_read(&oi->ip_alloc_sem);
2658 has_space = ocfs2_xattr_has_space_inline(inode, di);
2659 up_read(&oi->ip_alloc_sem);
2660 if (!has_space)
2661 return 0;
2662 }
2663
2664 xs->xattr_bh = xs->inode_bh;
2665 xs->end = (void *)di + inode->i_sb->s_blocksize;
2666 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
2667 xs->header = (struct ocfs2_xattr_header *)
2668 (xs->end - le16_to_cpu(di->i_xattr_inline_size));
2669 else
2670 xs->header = (struct ocfs2_xattr_header *)
2671 (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
2672 xs->base = (void *)xs->header;
2673 xs->here = xs->header->xh_entries;
2674
2675 /* Find the named attribute. */
2676 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2677 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2678 if (ret && ret != -ENODATA)
2679 return ret;
2680 xs->not_found = ret;
2681 }
2682
2683 return 0;
2684 }
2685
2686 static int ocfs2_xattr_ibody_init(struct inode *inode,
2687 struct buffer_head *di_bh,
2688 struct ocfs2_xattr_set_ctxt *ctxt)
2689 {
2690 int ret;
2691 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2692 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2693 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2694 unsigned int xattrsize = osb->s_xattr_inline_size;
2695
2696 if (!ocfs2_xattr_has_space_inline(inode, di)) {
2697 ret = -ENOSPC;
2698 goto out;
2699 }
2700
2701 ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode), di_bh,
2702 OCFS2_JOURNAL_ACCESS_WRITE);
2703 if (ret) {
2704 mlog_errno(ret);
2705 goto out;
2706 }
2707
2708 /*
2709 * Adjust extent record count or inline data size
2710 * to reserve space for extended attribute.
2711 */
2712 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2713 struct ocfs2_inline_data *idata = &di->id2.i_data;
2714 le16_add_cpu(&idata->id_count, -xattrsize);
2715 } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
2716 struct ocfs2_extent_list *el = &di->id2.i_list;
2717 le16_add_cpu(&el->l_count, -(xattrsize /
2718 sizeof(struct ocfs2_extent_rec)));
2719 }
2720 di->i_xattr_inline_size = cpu_to_le16(xattrsize);
2721
2722 spin_lock(&oi->ip_lock);
2723 oi->ip_dyn_features |= OCFS2_INLINE_XATTR_FL|OCFS2_HAS_XATTR_FL;
2724 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
2725 spin_unlock(&oi->ip_lock);
2726
2727 ret = ocfs2_journal_dirty(ctxt->handle, di_bh);
2728 if (ret < 0)
2729 mlog_errno(ret);
2730
2731 out:
2732 return ret;
2733 }
2734
2735 /*
2736 * ocfs2_xattr_ibody_set()
2737 *
2738 * Set, replace or remove an extended attribute into inode block.
2739 *
2740 */
2741 static int ocfs2_xattr_ibody_set(struct inode *inode,
2742 struct ocfs2_xattr_info *xi,
2743 struct ocfs2_xattr_search *xs,
2744 struct ocfs2_xattr_set_ctxt *ctxt)
2745 {
2746 int ret;
2747 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2748 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2749 struct ocfs2_xa_loc loc;
2750
2751 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2752 return -ENOSPC;
2753
2754 down_write(&oi->ip_alloc_sem);
2755 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2756 if (!ocfs2_xattr_has_space_inline(inode, di)) {
2757 ret = -ENOSPC;
2758 goto out;
2759 }
2760 }
2761
2762 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2763 ret = ocfs2_xattr_ibody_init(inode, xs->inode_bh, ctxt);
2764 if (ret) {
2765 if (ret != -ENOSPC)
2766 mlog_errno(ret);
2767 goto out;
2768 }
2769 }
2770
2771 ocfs2_init_dinode_xa_loc(&loc, inode, xs->inode_bh,
2772 xs->not_found ? NULL : xs->here);
2773 ret = ocfs2_xa_set(&loc, xi, ctxt);
2774 if (ret) {
2775 if (ret != -ENOSPC)
2776 mlog_errno(ret);
2777 goto out;
2778 }
2779 xs->here = loc.xl_entry;
2780
2781 out:
2782 up_write(&oi->ip_alloc_sem);
2783
2784 return ret;
2785 }
2786
2787 /*
2788 * ocfs2_xattr_block_find()
2789 *
2790 * Find extended attribute in external block and
2791 * fill search info into struct ocfs2_xattr_search.
2792 */
2793 static int ocfs2_xattr_block_find(struct inode *inode,
2794 int name_index,
2795 const char *name,
2796 struct ocfs2_xattr_search *xs)
2797 {
2798 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2799 struct buffer_head *blk_bh = NULL;
2800 struct ocfs2_xattr_block *xb;
2801 int ret = 0;
2802
2803 if (!di->i_xattr_loc)
2804 return ret;
2805
2806 ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
2807 &blk_bh);
2808 if (ret < 0) {
2809 mlog_errno(ret);
2810 return ret;
2811 }
2812
2813 xs->xattr_bh = blk_bh;
2814 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2815
2816 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2817 xs->header = &xb->xb_attrs.xb_header;
2818 xs->base = (void *)xs->header;
2819 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
2820 xs->here = xs->header->xh_entries;
2821
2822 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2823 } else
2824 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
2825 name_index,
2826 name, xs);
2827
2828 if (ret && ret != -ENODATA) {
2829 xs->xattr_bh = NULL;
2830 goto cleanup;
2831 }
2832 xs->not_found = ret;
2833 return 0;
2834 cleanup:
2835 brelse(blk_bh);
2836
2837 return ret;
2838 }
2839
2840 static int ocfs2_create_xattr_block(struct inode *inode,
2841 struct buffer_head *inode_bh,
2842 struct ocfs2_xattr_set_ctxt *ctxt,
2843 int indexed,
2844 struct buffer_head **ret_bh)
2845 {
2846 int ret;
2847 u16 suballoc_bit_start;
2848 u32 num_got;
2849 u64 first_blkno;
2850 struct ocfs2_dinode *di = (struct ocfs2_dinode *)inode_bh->b_data;
2851 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2852 struct buffer_head *new_bh = NULL;
2853 struct ocfs2_xattr_block *xblk;
2854
2855 ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
2856 inode_bh, OCFS2_JOURNAL_ACCESS_CREATE);
2857 if (ret < 0) {
2858 mlog_errno(ret);
2859 goto end;
2860 }
2861
2862 ret = ocfs2_claim_metadata(osb, ctxt->handle, ctxt->meta_ac, 1,
2863 &suballoc_bit_start, &num_got,
2864 &first_blkno);
2865 if (ret < 0) {
2866 mlog_errno(ret);
2867 goto end;
2868 }
2869
2870 new_bh = sb_getblk(inode->i_sb, first_blkno);
2871 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), new_bh);
2872
2873 ret = ocfs2_journal_access_xb(ctxt->handle, INODE_CACHE(inode),
2874 new_bh,
2875 OCFS2_JOURNAL_ACCESS_CREATE);
2876 if (ret < 0) {
2877 mlog_errno(ret);
2878 goto end;
2879 }
2880
2881 /* Initialize ocfs2_xattr_block */
2882 xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
2883 memset(xblk, 0, inode->i_sb->s_blocksize);
2884 strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
2885 xblk->xb_suballoc_slot = cpu_to_le16(ctxt->meta_ac->ac_alloc_slot);
2886 xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
2887 xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation);
2888 xblk->xb_blkno = cpu_to_le64(first_blkno);
2889 if (indexed) {
2890 struct ocfs2_xattr_tree_root *xr = &xblk->xb_attrs.xb_root;
2891 xr->xt_clusters = cpu_to_le32(1);
2892 xr->xt_last_eb_blk = 0;
2893 xr->xt_list.l_tree_depth = 0;
2894 xr->xt_list.l_count = cpu_to_le16(
2895 ocfs2_xattr_recs_per_xb(inode->i_sb));
2896 xr->xt_list.l_next_free_rec = cpu_to_le16(1);
2897 xblk->xb_flags = cpu_to_le16(OCFS2_XATTR_INDEXED);
2898 }
2899 ocfs2_journal_dirty(ctxt->handle, new_bh);
2900
2901 /* Add it to the inode */
2902 di->i_xattr_loc = cpu_to_le64(first_blkno);
2903
2904 spin_lock(&OCFS2_I(inode)->ip_lock);
2905 OCFS2_I(inode)->ip_dyn_features |= OCFS2_HAS_XATTR_FL;
2906 di->i_dyn_features = cpu_to_le16(OCFS2_I(inode)->ip_dyn_features);
2907 spin_unlock(&OCFS2_I(inode)->ip_lock);
2908
2909 ocfs2_journal_dirty(ctxt->handle, inode_bh);
2910
2911 *ret_bh = new_bh;
2912 new_bh = NULL;
2913
2914 end:
2915 brelse(new_bh);
2916 return ret;
2917 }
2918
2919 /*
2920 * ocfs2_xattr_block_set()
2921 *
2922 * Set, replace or remove an extended attribute into external block.
2923 *
2924 */
2925 static int ocfs2_xattr_block_set(struct inode *inode,
2926 struct ocfs2_xattr_info *xi,
2927 struct ocfs2_xattr_search *xs,
2928 struct ocfs2_xattr_set_ctxt *ctxt)
2929 {
2930 struct buffer_head *new_bh = NULL;
2931 struct ocfs2_xattr_block *xblk = NULL;
2932 int ret;
2933 struct ocfs2_xa_loc loc;
2934
2935 if (!xs->xattr_bh) {
2936 ret = ocfs2_create_xattr_block(inode, xs->inode_bh, ctxt,
2937 0, &new_bh);
2938 if (ret) {
2939 mlog_errno(ret);
2940 goto end;
2941 }
2942
2943 xs->xattr_bh = new_bh;
2944 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2945 xs->header = &xblk->xb_attrs.xb_header;
2946 xs->base = (void *)xs->header;
2947 xs->end = (void *)xblk + inode->i_sb->s_blocksize;
2948 xs->here = xs->header->xh_entries;
2949 } else
2950 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2951
2952 if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
2953 ocfs2_init_xattr_block_xa_loc(&loc, inode, xs->xattr_bh,
2954 xs->not_found ? NULL : xs->here);
2955
2956 ret = ocfs2_xa_set(&loc, xi, ctxt);
2957 if (!ret)
2958 xs->here = loc.xl_entry;
2959 else if (ret != -ENOSPC)
2960 goto end;
2961 else {
2962 ret = ocfs2_xattr_create_index_block(inode, xs, ctxt);
2963 if (ret)
2964 goto end;
2965 }
2966 }
2967
2968 if (le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)
2969 ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs, ctxt);
2970
2971 end:
2972 return ret;
2973 }
2974
2975 /* Check whether the new xattr can be inserted into the inode. */
2976 static int ocfs2_xattr_can_be_in_inode(struct inode *inode,
2977 struct ocfs2_xattr_info *xi,
2978 struct ocfs2_xattr_search *xs)
2979 {
2980 struct ocfs2_xattr_entry *last;
2981 int free, i;
2982 size_t min_offs = xs->end - xs->base;
2983
2984 if (!xs->header)
2985 return 0;
2986
2987 last = xs->header->xh_entries;
2988
2989 for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
2990 size_t offs = le16_to_cpu(last->xe_name_offset);
2991 if (offs < min_offs)
2992 min_offs = offs;
2993 last += 1;
2994 }
2995
2996 free = min_offs - ((void *)last - xs->base) - OCFS2_XATTR_HEADER_GAP;
2997 if (free < 0)
2998 return 0;
2999
3000 BUG_ON(!xs->not_found);
3001
3002 if (free >= (sizeof(struct ocfs2_xattr_entry) + namevalue_size_xi(xi)))
3003 return 1;
3004
3005 return 0;
3006 }
3007
3008 static int ocfs2_calc_xattr_set_need(struct inode *inode,
3009 struct ocfs2_dinode *di,
3010 struct ocfs2_xattr_info *xi,
3011 struct ocfs2_xattr_search *xis,
3012 struct ocfs2_xattr_search *xbs,
3013 int *clusters_need,
3014 int *meta_need,
3015 int *credits_need)
3016 {
3017 int ret = 0, old_in_xb = 0;
3018 int clusters_add = 0, meta_add = 0, credits = 0;
3019 struct buffer_head *bh = NULL;
3020 struct ocfs2_xattr_block *xb = NULL;
3021 struct ocfs2_xattr_entry *xe = NULL;
3022 struct ocfs2_xattr_value_root *xv = NULL;
3023 char *base = NULL;
3024 int name_offset, name_len = 0;
3025 u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
3026 xi->xi_value_len);
3027 u64 value_size;
3028
3029 /*
3030 * Calculate the clusters we need to write.
3031 * No matter whether we replace an old one or add a new one,
3032 * we need this for writing.
3033 */
3034 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE)
3035 credits += new_clusters *
3036 ocfs2_clusters_to_blocks(inode->i_sb, 1);
3037
3038 if (xis->not_found && xbs->not_found) {
3039 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3040
3041 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3042 clusters_add += new_clusters;
3043 credits += ocfs2_calc_extend_credits(inode->i_sb,
3044 &def_xv.xv.xr_list,
3045 new_clusters);
3046 }
3047
3048 goto meta_guess;
3049 }
3050
3051 if (!xis->not_found) {
3052 xe = xis->here;
3053 name_offset = le16_to_cpu(xe->xe_name_offset);
3054 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3055 base = xis->base;
3056 credits += OCFS2_INODE_UPDATE_CREDITS;
3057 } else {
3058 int i, block_off = 0;
3059 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
3060 xe = xbs->here;
3061 name_offset = le16_to_cpu(xe->xe_name_offset);
3062 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3063 i = xbs->here - xbs->header->xh_entries;
3064 old_in_xb = 1;
3065
3066 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
3067 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3068 bucket_xh(xbs->bucket),
3069 i, &block_off,
3070 &name_offset);
3071 base = bucket_block(xbs->bucket, block_off);
3072 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3073 } else {
3074 base = xbs->base;
3075 credits += OCFS2_XATTR_BLOCK_UPDATE_CREDITS;
3076 }
3077 }
3078
3079 /*
3080 * delete a xattr doesn't need metadata and cluster allocation.
3081 * so just calculate the credits and return.
3082 *
3083 * The credits for removing the value tree will be extended
3084 * by ocfs2_remove_extent itself.
3085 */
3086 if (!xi->xi_value) {
3087 if (!ocfs2_xattr_is_local(xe))
3088 credits += ocfs2_remove_extent_credits(inode->i_sb);
3089
3090 goto out;
3091 }
3092
3093 /* do cluster allocation guess first. */
3094 value_size = le64_to_cpu(xe->xe_value_size);
3095
3096 if (old_in_xb) {
3097 /*
3098 * In xattr set, we always try to set the xe in inode first,
3099 * so if it can be inserted into inode successfully, the old
3100 * one will be removed from the xattr block, and this xattr
3101 * will be inserted into inode as a new xattr in inode.
3102 */
3103 if (ocfs2_xattr_can_be_in_inode(inode, xi, xis)) {
3104 clusters_add += new_clusters;
3105 credits += ocfs2_remove_extent_credits(inode->i_sb) +
3106 OCFS2_INODE_UPDATE_CREDITS;
3107 if (!ocfs2_xattr_is_local(xe))
3108 credits += ocfs2_calc_extend_credits(
3109 inode->i_sb,
3110 &def_xv.xv.xr_list,
3111 new_clusters);
3112 goto out;
3113 }
3114 }
3115
3116 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3117 /* the new values will be stored outside. */
3118 u32 old_clusters = 0;
3119
3120 if (!ocfs2_xattr_is_local(xe)) {
3121 old_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
3122 value_size);
3123 xv = (struct ocfs2_xattr_value_root *)
3124 (base + name_offset + name_len);
3125 value_size = OCFS2_XATTR_ROOT_SIZE;
3126 } else
3127 xv = &def_xv.xv;
3128
3129 if (old_clusters >= new_clusters) {
3130 credits += ocfs2_remove_extent_credits(inode->i_sb);
3131 goto out;
3132 } else {
3133 meta_add += ocfs2_extend_meta_needed(&xv->xr_list);
3134 clusters_add += new_clusters - old_clusters;
3135 credits += ocfs2_calc_extend_credits(inode->i_sb,
3136 &xv->xr_list,
3137 new_clusters -
3138 old_clusters);
3139 if (value_size >= OCFS2_XATTR_ROOT_SIZE)
3140 goto out;
3141 }
3142 } else {
3143 /*
3144 * Now the new value will be stored inside. So if the new
3145 * value is smaller than the size of value root or the old
3146 * value, we don't need any allocation, otherwise we have
3147 * to guess metadata allocation.
3148 */
3149 if ((ocfs2_xattr_is_local(xe) &&
3150 (value_size >= xi->xi_value_len)) ||
3151 (!ocfs2_xattr_is_local(xe) &&
3152 OCFS2_XATTR_ROOT_SIZE >= xi->xi_value_len))
3153 goto out;
3154 }
3155
3156 meta_guess:
3157 /* calculate metadata allocation. */
3158 if (di->i_xattr_loc) {
3159 if (!xbs->xattr_bh) {
3160 ret = ocfs2_read_xattr_block(inode,
3161 le64_to_cpu(di->i_xattr_loc),
3162 &bh);
3163 if (ret) {
3164 mlog_errno(ret);
3165 goto out;
3166 }
3167
3168 xb = (struct ocfs2_xattr_block *)bh->b_data;
3169 } else
3170 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
3171
3172 /*
3173 * If there is already an xattr tree, good, we can calculate
3174 * like other b-trees. Otherwise we may have the chance of
3175 * create a tree, the credit calculation is borrowed from
3176 * ocfs2_calc_extend_credits with root_el = NULL. And the
3177 * new tree will be cluster based, so no meta is needed.
3178 */
3179 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
3180 struct ocfs2_extent_list *el =
3181 &xb->xb_attrs.xb_root.xt_list;
3182 meta_add += ocfs2_extend_meta_needed(el);
3183 credits += ocfs2_calc_extend_credits(inode->i_sb,
3184 el, 1);
3185 } else
3186 credits += OCFS2_SUBALLOC_ALLOC + 1;
3187
3188 /*
3189 * This cluster will be used either for new bucket or for
3190 * new xattr block.
3191 * If the cluster size is the same as the bucket size, one
3192 * more is needed since we may need to extend the bucket
3193 * also.
3194 */
3195 clusters_add += 1;
3196 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3197 if (OCFS2_XATTR_BUCKET_SIZE ==
3198 OCFS2_SB(inode->i_sb)->s_clustersize) {
3199 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3200 clusters_add += 1;
3201 }
3202 } else {
3203 meta_add += 1;
3204 credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
3205 }
3206 out:
3207 if (clusters_need)
3208 *clusters_need = clusters_add;
3209 if (meta_need)
3210 *meta_need = meta_add;
3211 if (credits_need)
3212 *credits_need = credits;
3213 brelse(bh);
3214 return ret;
3215 }
3216
3217 static int ocfs2_init_xattr_set_ctxt(struct inode *inode,
3218 struct ocfs2_dinode *di,
3219 struct ocfs2_xattr_info *xi,
3220 struct ocfs2_xattr_search *xis,
3221 struct ocfs2_xattr_search *xbs,
3222 struct ocfs2_xattr_set_ctxt *ctxt,
3223 int extra_meta,
3224 int *credits)
3225 {
3226 int clusters_add, meta_add, ret;
3227 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3228
3229 memset(ctxt, 0, sizeof(struct ocfs2_xattr_set_ctxt));
3230
3231 ocfs2_init_dealloc_ctxt(&ctxt->dealloc);
3232
3233 ret = ocfs2_calc_xattr_set_need(inode, di, xi, xis, xbs,
3234 &clusters_add, &meta_add, credits);
3235 if (ret) {
3236 mlog_errno(ret);
3237 return ret;
3238 }
3239
3240 meta_add += extra_meta;
3241 mlog(0, "Set xattr %s, reserve meta blocks = %d, clusters = %d, "
3242 "credits = %d\n", xi->xi_name, meta_add, clusters_add, *credits);
3243
3244 if (meta_add) {
3245 ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add,
3246 &ctxt->meta_ac);
3247 if (ret) {
3248 mlog_errno(ret);
3249 goto out;
3250 }
3251 }
3252
3253 if (clusters_add) {
3254 ret = ocfs2_reserve_clusters(osb, clusters_add, &ctxt->data_ac);
3255 if (ret)
3256 mlog_errno(ret);
3257 }
3258 out:
3259 if (ret) {
3260 if (ctxt->meta_ac) {
3261 ocfs2_free_alloc_context(ctxt->meta_ac);
3262 ctxt->meta_ac = NULL;
3263 }
3264
3265 /*
3266 * We cannot have an error and a non null ctxt->data_ac.
3267 */
3268 }
3269
3270 return ret;
3271 }
3272
3273 static int __ocfs2_xattr_set_handle(struct inode *inode,
3274 struct ocfs2_dinode *di,
3275 struct ocfs2_xattr_info *xi,
3276 struct ocfs2_xattr_search *xis,
3277 struct ocfs2_xattr_search *xbs,
3278 struct ocfs2_xattr_set_ctxt *ctxt)
3279 {
3280 int ret = 0, credits, old_found;
3281
3282 if (!xi->xi_value) {
3283 /* Remove existing extended attribute */
3284 if (!xis->not_found)
3285 ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
3286 else if (!xbs->not_found)
3287 ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3288 } else {
3289 /* We always try to set extended attribute into inode first*/
3290 ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
3291 if (!ret && !xbs->not_found) {
3292 /*
3293 * If succeed and that extended attribute existing in
3294 * external block, then we will remove it.
3295 */
3296 xi->xi_value = NULL;
3297 xi->xi_value_len = 0;
3298
3299 old_found = xis->not_found;
3300 xis->not_found = -ENODATA;
3301 ret = ocfs2_calc_xattr_set_need(inode,
3302 di,
3303 xi,
3304 xis,
3305 xbs,
3306 NULL,
3307 NULL,
3308 &credits);
3309 xis->not_found = old_found;
3310 if (ret) {
3311 mlog_errno(ret);
3312 goto out;
3313 }
3314
3315 ret = ocfs2_extend_trans(ctxt->handle, credits +
3316 ctxt->handle->h_buffer_credits);
3317 if (ret) {
3318 mlog_errno(ret);
3319 goto out;
3320 }
3321 ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3322 } else if (ret == -ENOSPC) {
3323 if (di->i_xattr_loc && !xbs->xattr_bh) {
3324 ret = ocfs2_xattr_block_find(inode,
3325 xi->xi_name_index,
3326 xi->xi_name, xbs);
3327 if (ret)
3328 goto out;
3329
3330 old_found = xis->not_found;
3331 xis->not_found = -ENODATA;
3332 ret = ocfs2_calc_xattr_set_need(inode,
3333 di,
3334 xi,
3335 xis,
3336 xbs,
3337 NULL,
3338 NULL,
3339 &credits);
3340 xis->not_found = old_found;
3341 if (ret) {
3342 mlog_errno(ret);
3343 goto out;
3344 }
3345
3346 ret = ocfs2_extend_trans(ctxt->handle, credits +
3347 ctxt->handle->h_buffer_credits);
3348 if (ret) {
3349 mlog_errno(ret);
3350 goto out;
3351 }
3352 }
3353 /*
3354 * If no space in inode, we will set extended attribute
3355 * into external block.
3356 */
3357 ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3358 if (ret)
3359 goto out;
3360 if (!xis->not_found) {
3361 /*
3362 * If succeed and that extended attribute
3363 * existing in inode, we will remove it.
3364 */
3365 xi->xi_value = NULL;
3366 xi->xi_value_len = 0;
3367 xbs->not_found = -ENODATA;
3368 ret = ocfs2_calc_xattr_set_need(inode,
3369 di,
3370 xi,
3371 xis,
3372 xbs,
3373 NULL,
3374 NULL,
3375 &credits);
3376 if (ret) {
3377 mlog_errno(ret);
3378 goto out;
3379 }
3380
3381 ret = ocfs2_extend_trans(ctxt->handle, credits +
3382 ctxt->handle->h_buffer_credits);
3383 if (ret) {
3384 mlog_errno(ret);
3385 goto out;
3386 }
3387 ret = ocfs2_xattr_ibody_set(inode, xi,
3388 xis, ctxt);
3389 }
3390 }
3391 }
3392
3393 if (!ret) {
3394 /* Update inode ctime. */
3395 ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
3396 xis->inode_bh,
3397 OCFS2_JOURNAL_ACCESS_WRITE);
3398 if (ret) {
3399 mlog_errno(ret);
3400 goto out;
3401 }
3402
3403 inode->i_ctime = CURRENT_TIME;
3404 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
3405 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
3406 ocfs2_journal_dirty(ctxt->handle, xis->inode_bh);
3407 }
3408 out:
3409 return ret;
3410 }
3411
3412 /*
3413 * This function only called duing creating inode
3414 * for init security/acl xattrs of the new inode.
3415 * All transanction credits have been reserved in mknod.
3416 */
3417 int ocfs2_xattr_set_handle(handle_t *handle,
3418 struct inode *inode,
3419 struct buffer_head *di_bh,
3420 int name_index,
3421 const char *name,
3422 const void *value,
3423 size_t value_len,
3424 int flags,
3425 struct ocfs2_alloc_context *meta_ac,
3426 struct ocfs2_alloc_context *data_ac)
3427 {
3428 struct ocfs2_dinode *di;
3429 int ret;
3430
3431 struct ocfs2_xattr_info xi = {
3432 .xi_name_index = name_index,
3433 .xi_name = name,
3434 .xi_name_len = strlen(name),
3435 .xi_value = value,
3436 .xi_value_len = value_len,
3437 };
3438
3439 struct ocfs2_xattr_search xis = {
3440 .not_found = -ENODATA,
3441 };
3442
3443 struct ocfs2_xattr_search xbs = {
3444 .not_found = -ENODATA,
3445 };
3446
3447 struct ocfs2_xattr_set_ctxt ctxt = {
3448 .handle = handle,
3449 .meta_ac = meta_ac,
3450 .data_ac = data_ac,
3451 };
3452
3453 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
3454 return -EOPNOTSUPP;
3455
3456 /*
3457 * In extreme situation, may need xattr bucket when
3458 * block size is too small. And we have already reserved
3459 * the credits for bucket in mknod.
3460 */
3461 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) {
3462 xbs.bucket = ocfs2_xattr_bucket_new(inode);
3463 if (!xbs.bucket) {
3464 mlog_errno(-ENOMEM);
3465 return -ENOMEM;
3466 }
3467 }
3468
3469 xis.inode_bh = xbs.inode_bh = di_bh;
3470 di = (struct ocfs2_dinode *)di_bh->b_data;
3471
3472 down_write(&OCFS2_I(inode)->ip_xattr_sem);
3473
3474 ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
3475 if (ret)
3476 goto cleanup;
3477 if (xis.not_found) {
3478 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
3479 if (ret)
3480 goto cleanup;
3481 }
3482
3483 ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
3484
3485 cleanup:
3486 up_write(&OCFS2_I(inode)->ip_xattr_sem);
3487 brelse(xbs.xattr_bh);
3488 ocfs2_xattr_bucket_free(xbs.bucket);
3489
3490 return ret;
3491 }
3492
3493 /*
3494 * ocfs2_xattr_set()
3495 *
3496 * Set, replace or remove an extended attribute for this inode.
3497 * value is NULL to remove an existing extended attribute, else either
3498 * create or replace an extended attribute.
3499 */
3500 int ocfs2_xattr_set(struct inode *inode,
3501 int name_index,
3502 const char *name,
3503 const void *value,
3504 size_t value_len,
3505 int flags)
3506 {
3507 struct buffer_head *di_bh = NULL;
3508 struct ocfs2_dinode *di;
3509 int ret, credits, ref_meta = 0, ref_credits = 0;
3510 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3511 struct inode *tl_inode = osb->osb_tl_inode;
3512 struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
3513 struct ocfs2_refcount_tree *ref_tree = NULL;
3514
3515 struct ocfs2_xattr_info xi = {
3516 .xi_name_index = name_index,
3517 .xi_name = name,
3518 .xi_name_len = strlen(name),
3519 .xi_value = value,
3520 .xi_value_len = value_len,
3521 };
3522
3523 struct ocfs2_xattr_search xis = {
3524 .not_found = -ENODATA,
3525 };
3526
3527 struct ocfs2_xattr_search xbs = {
3528 .not_found = -ENODATA,
3529 };
3530
3531 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
3532 return -EOPNOTSUPP;
3533
3534 /*
3535 * Only xbs will be used on indexed trees. xis doesn't need a
3536 * bucket.
3537 */
3538 xbs.bucket = ocfs2_xattr_bucket_new(inode);
3539 if (!xbs.bucket) {
3540 mlog_errno(-ENOMEM);
3541 return -ENOMEM;
3542 }
3543
3544 ret = ocfs2_inode_lock(inode, &di_bh, 1);
3545 if (ret < 0) {
3546 mlog_errno(ret);
3547 goto cleanup_nolock;
3548 }
3549 xis.inode_bh = xbs.inode_bh = di_bh;
3550 di = (struct ocfs2_dinode *)di_bh->b_data;
3551
3552 down_write(&OCFS2_I(inode)->ip_xattr_sem);
3553 /*
3554 * Scan inode and external block to find the same name
3555 * extended attribute and collect search infomation.
3556 */
3557 ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
3558 if (ret)
3559 goto cleanup;
3560 if (xis.not_found) {
3561 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
3562 if (ret)
3563 goto cleanup;
3564 }
3565
3566 if (xis.not_found && xbs.not_found) {
3567 ret = -ENODATA;
3568 if (flags & XATTR_REPLACE)
3569 goto cleanup;
3570 ret = 0;
3571 if (!value)
3572 goto cleanup;
3573 } else {
3574 ret = -EEXIST;
3575 if (flags & XATTR_CREATE)
3576 goto cleanup;
3577 }
3578
3579 /* Check whether the value is refcounted and do some prepartion. */
3580 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL &&
3581 (!xis.not_found || !xbs.not_found)) {
3582 ret = ocfs2_prepare_refcount_xattr(inode, di, &xi,
3583 &xis, &xbs, &ref_tree,
3584 &ref_meta, &ref_credits);
3585 if (ret) {
3586 mlog_errno(ret);
3587 goto cleanup;
3588 }
3589 }
3590
3591 mutex_lock(&tl_inode->i_mutex);
3592
3593 if (ocfs2_truncate_log_needs_flush(osb)) {
3594 ret = __ocfs2_flush_truncate_log(osb);
3595 if (ret < 0) {
3596 mutex_unlock(&tl_inode->i_mutex);
3597 mlog_errno(ret);
3598 goto cleanup;
3599 }
3600 }
3601 mutex_unlock(&tl_inode->i_mutex);
3602
3603 ret = ocfs2_init_xattr_set_ctxt(inode, di, &xi, &xis,
3604 &xbs, &ctxt, ref_meta, &credits);
3605 if (ret) {
3606 mlog_errno(ret);
3607 goto cleanup;
3608 }
3609
3610 /* we need to update inode's ctime field, so add credit for it. */
3611 credits += OCFS2_INODE_UPDATE_CREDITS;
3612 ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
3613 if (IS_ERR(ctxt.handle)) {
3614 ret = PTR_ERR(ctxt.handle);
3615 mlog_errno(ret);
3616 goto cleanup;
3617 }
3618
3619 ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
3620
3621 ocfs2_commit_trans(osb, ctxt.handle);
3622
3623 if (ctxt.data_ac)
3624 ocfs2_free_alloc_context(ctxt.data_ac);
3625 if (ctxt.meta_ac)
3626 ocfs2_free_alloc_context(ctxt.meta_ac);
3627 if (ocfs2_dealloc_has_cluster(&ctxt.dealloc))
3628 ocfs2_schedule_truncate_log_flush(osb, 1);
3629 ocfs2_run_deallocs(osb, &ctxt.dealloc);
3630
3631 cleanup:
3632 if (ref_tree)
3633 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3634 up_write(&OCFS2_I(inode)->ip_xattr_sem);
3635 if (!value && !ret) {
3636 ret = ocfs2_try_remove_refcount_tree(inode, di_bh);
3637 if (ret)
3638 mlog_errno(ret);
3639 }
3640 ocfs2_inode_unlock(inode, 1);
3641 cleanup_nolock:
3642 brelse(di_bh);
3643 brelse(xbs.xattr_bh);
3644 ocfs2_xattr_bucket_free(xbs.bucket);
3645
3646 return ret;
3647 }
3648
3649 /*
3650 * Find the xattr extent rec which may contains name_hash.
3651 * e_cpos will be the first name hash of the xattr rec.
3652 * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
3653 */
3654 static int ocfs2_xattr_get_rec(struct inode *inode,
3655 u32 name_hash,
3656 u64 *p_blkno,
3657 u32 *e_cpos,
3658 u32 *num_clusters,
3659 struct ocfs2_extent_list *el)
3660 {
3661 int ret = 0, i;
3662 struct buffer_head *eb_bh = NULL;
3663 struct ocfs2_extent_block *eb;
3664 struct ocfs2_extent_rec *rec = NULL;
3665 u64 e_blkno = 0;
3666
3667 if (el->l_tree_depth) {
3668 ret = ocfs2_find_leaf(INODE_CACHE(inode), el, name_hash,
3669 &eb_bh);
3670 if (ret) {
3671 mlog_errno(ret);
3672 goto out;
3673 }
3674
3675 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
3676 el = &eb->h_list;
3677
3678 if (el->l_tree_depth) {
3679 ocfs2_error(inode->i_sb,
3680 "Inode %lu has non zero tree depth in "
3681 "xattr tree block %llu\n", inode->i_ino,
3682 (unsigned long long)eb_bh->b_blocknr);
3683 ret = -EROFS;
3684 goto out;
3685 }
3686 }
3687
3688 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
3689 rec = &el->l_recs[i];
3690
3691 if (le32_to_cpu(rec->e_cpos) <= name_hash) {
3692 e_blkno = le64_to_cpu(rec->e_blkno);
3693 break;
3694 }
3695 }
3696
3697 if (!e_blkno) {
3698 ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
3699 "record (%u, %u, 0) in xattr", inode->i_ino,
3700 le32_to_cpu(rec->e_cpos),
3701 ocfs2_rec_clusters(el, rec));
3702 ret = -EROFS;
3703 goto out;
3704 }
3705
3706 *p_blkno = le64_to_cpu(rec->e_blkno);
3707 *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
3708 if (e_cpos)
3709 *e_cpos = le32_to_cpu(rec->e_cpos);
3710 out:
3711 brelse(eb_bh);
3712 return ret;
3713 }
3714
3715 typedef int (xattr_bucket_func)(struct inode *inode,
3716 struct ocfs2_xattr_bucket *bucket,
3717 void *para);
3718
3719 static int ocfs2_find_xe_in_bucket(struct inode *inode,
3720 struct ocfs2_xattr_bucket *bucket,
3721 int name_index,
3722 const char *name,
3723 u32 name_hash,
3724 u16 *xe_index,
3725 int *found)
3726 {
3727 int i, ret = 0, cmp = 1, block_off, new_offset;
3728 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
3729 size_t name_len = strlen(name);
3730 struct ocfs2_xattr_entry *xe = NULL;
3731 char *xe_name;
3732
3733 /*
3734 * We don't use binary search in the bucket because there
3735 * may be multiple entries with the same name hash.
3736 */
3737 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3738 xe = &xh->xh_entries[i];
3739
3740 if (name_hash > le32_to_cpu(xe->xe_name_hash))
3741 continue;
3742 else if (name_hash < le32_to_cpu(xe->xe_name_hash))
3743 break;
3744
3745 cmp = name_index - ocfs2_xattr_get_type(xe);
3746 if (!cmp)
3747 cmp = name_len - xe->xe_name_len;
3748 if (cmp)
3749 continue;
3750
3751 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3752 xh,
3753 i,
3754 &block_off,
3755 &new_offset);
3756 if (ret) {
3757 mlog_errno(ret);
3758 break;
3759 }
3760
3761
3762 xe_name = bucket_block(bucket, block_off) + new_offset;
3763 if (!memcmp(name, xe_name, name_len)) {
3764 *xe_index = i;
3765 *found = 1;
3766 ret = 0;
3767 break;
3768 }
3769 }
3770
3771 return ret;
3772 }
3773
3774 /*
3775 * Find the specified xattr entry in a series of buckets.
3776 * This series start from p_blkno and last for num_clusters.
3777 * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
3778 * the num of the valid buckets.
3779 *
3780 * Return the buffer_head this xattr should reside in. And if the xattr's
3781 * hash is in the gap of 2 buckets, return the lower bucket.
3782 */
3783 static int ocfs2_xattr_bucket_find(struct inode *inode,
3784 int name_index,
3785 const char *name,
3786 u32 name_hash,
3787 u64 p_blkno,
3788 u32 first_hash,
3789 u32 num_clusters,
3790 struct ocfs2_xattr_search *xs)
3791 {
3792 int ret, found = 0;
3793 struct ocfs2_xattr_header *xh = NULL;
3794 struct ocfs2_xattr_entry *xe = NULL;
3795 u16 index = 0;
3796 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3797 int low_bucket = 0, bucket, high_bucket;
3798 struct ocfs2_xattr_bucket *search;
3799 u32 last_hash;
3800 u64 blkno, lower_blkno = 0;
3801
3802 search = ocfs2_xattr_bucket_new(inode);
3803 if (!search) {
3804 ret = -ENOMEM;
3805 mlog_errno(ret);
3806 goto out;
3807 }
3808
3809 ret = ocfs2_read_xattr_bucket(search, p_blkno);
3810 if (ret) {
3811 mlog_errno(ret);
3812 goto out;
3813 }
3814
3815 xh = bucket_xh(search);
3816 high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
3817 while (low_bucket <= high_bucket) {
3818 ocfs2_xattr_bucket_relse(search);
3819
3820 bucket = (low_bucket + high_bucket) / 2;
3821 blkno = p_blkno + bucket * blk_per_bucket;
3822 ret = ocfs2_read_xattr_bucket(search, blkno);
3823 if (ret) {
3824 mlog_errno(ret);
3825 goto out;
3826 }
3827
3828 xh = bucket_xh(search);
3829 xe = &xh->xh_entries[0];
3830 if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
3831 high_bucket = bucket - 1;
3832 continue;
3833 }
3834
3835 /*
3836 * Check whether the hash of the last entry in our
3837 * bucket is larger than the search one. for an empty
3838 * bucket, the last one is also the first one.
3839 */
3840 if (xh->xh_count)
3841 xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
3842
3843 last_hash = le32_to_cpu(xe->xe_name_hash);
3844
3845 /* record lower_blkno which may be the insert place. */
3846 lower_blkno = blkno;
3847
3848 if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
3849 low_bucket = bucket + 1;
3850 continue;
3851 }
3852
3853 /* the searched xattr should reside in this bucket if exists. */
3854 ret = ocfs2_find_xe_in_bucket(inode, search,
3855 name_index, name, name_hash,
3856 &index, &found);
3857 if (ret) {
3858 mlog_errno(ret);
3859 goto out;
3860 }
3861 break;
3862 }
3863
3864 /*
3865 * Record the bucket we have found.
3866 * When the xattr's hash value is in the gap of 2 buckets, we will
3867 * always set it to the previous bucket.
3868 */
3869 if (!lower_blkno)
3870 lower_blkno = p_blkno;
3871
3872 /* This should be in cache - we just read it during the search */
3873 ret = ocfs2_read_xattr_bucket(xs->bucket, lower_blkno);
3874 if (ret) {
3875 mlog_errno(ret);
3876 goto out;
3877 }
3878
3879 xs->header = bucket_xh(xs->bucket);
3880 xs->base = bucket_block(xs->bucket, 0);
3881 xs->end = xs->base + inode->i_sb->s_blocksize;
3882
3883 if (found) {
3884 xs->here = &xs->header->xh_entries[index];
3885 mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name,
3886 (unsigned long long)bucket_blkno(xs->bucket), index);
3887 } else
3888 ret = -ENODATA;
3889
3890 out:
3891 ocfs2_xattr_bucket_free(search);
3892 return ret;
3893 }
3894
3895 static int ocfs2_xattr_index_block_find(struct inode *inode,
3896 struct buffer_head *root_bh,
3897 int name_index,
3898 const char *name,
3899 struct ocfs2_xattr_search *xs)
3900 {
3901 int ret;
3902 struct ocfs2_xattr_block *xb =
3903 (struct ocfs2_xattr_block *)root_bh->b_data;
3904 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3905 struct ocfs2_extent_list *el = &xb_root->xt_list;
3906 u64 p_blkno = 0;
3907 u32 first_hash, num_clusters = 0;
3908 u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
3909
3910 if (le16_to_cpu(el->l_next_free_rec) == 0)
3911 return -ENODATA;
3912
3913 mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n",
3914 name, name_hash, name_index);
3915
3916 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
3917 &num_clusters, el);
3918 if (ret) {
3919 mlog_errno(ret);
3920 goto out;
3921 }
3922
3923 BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
3924
3925 mlog(0, "find xattr extent rec %u clusters from %llu, the first hash "
3926 "in the rec is %u\n", num_clusters, (unsigned long long)p_blkno,
3927 first_hash);
3928
3929 ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
3930 p_blkno, first_hash, num_clusters, xs);
3931
3932 out:
3933 return ret;
3934 }
3935
3936 static int ocfs2_iterate_xattr_buckets(struct inode *inode,
3937 u64 blkno,
3938 u32 clusters,
3939 xattr_bucket_func *func,
3940 void *para)
3941 {
3942 int i, ret = 0;
3943 u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
3944 u32 num_buckets = clusters * bpc;
3945 struct ocfs2_xattr_bucket *bucket;
3946
3947 bucket = ocfs2_xattr_bucket_new(inode);
3948 if (!bucket) {
3949 mlog_errno(-ENOMEM);
3950 return -ENOMEM;
3951 }
3952
3953 mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n",
3954 clusters, (unsigned long long)blkno);
3955
3956 for (i = 0; i < num_buckets; i++, blkno += bucket->bu_blocks) {
3957 ret = ocfs2_read_xattr_bucket(bucket, blkno);
3958 if (ret) {
3959 mlog_errno(ret);
3960 break;
3961 }
3962
3963 /*
3964 * The real bucket num in this series of blocks is stored
3965 * in the 1st bucket.
3966 */
3967 if (i == 0)
3968 num_buckets = le16_to_cpu(bucket_xh(bucket)->xh_num_buckets);
3969
3970 mlog(0, "iterating xattr bucket %llu, first hash %u\n",
3971 (unsigned long long)blkno,
3972 le32_to_cpu(bucket_xh(bucket)->xh_entries[0].xe_name_hash));
3973 if (func) {
3974 ret = func(inode, bucket, para);
3975 if (ret && ret != -ERANGE)
3976 mlog_errno(ret);
3977 /* Fall through to bucket_relse() */
3978 }
3979
3980 ocfs2_xattr_bucket_relse(bucket);
3981 if (ret)
3982 break;
3983 }
3984
3985 ocfs2_xattr_bucket_free(bucket);
3986 return ret;
3987 }
3988
3989 struct ocfs2_xattr_tree_list {
3990 char *buffer;
3991 size_t buffer_size;
3992 size_t result;
3993 };
3994
3995 static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
3996 struct ocfs2_xattr_header *xh,
3997 int index,
3998 int *block_off,
3999 int *new_offset)
4000 {
4001 u16 name_offset;
4002
4003 if (index < 0 || index >= le16_to_cpu(xh->xh_count))
4004 return -EINVAL;
4005
4006 name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
4007
4008 *block_off = name_offset >> sb->s_blocksize_bits;
4009 *new_offset = name_offset % sb->s_blocksize;
4010
4011 return 0;
4012 }
4013
4014 static int ocfs2_list_xattr_bucket(struct inode *inode,
4015 struct ocfs2_xattr_bucket *bucket,
4016 void *para)
4017 {
4018 int ret = 0, type;
4019 struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
4020 int i, block_off, new_offset;
4021 const char *prefix, *name;
4022
4023 for (i = 0 ; i < le16_to_cpu(bucket_xh(bucket)->xh_count); i++) {
4024 struct ocfs2_xattr_entry *entry = &bucket_xh(bucket)->xh_entries[i];
4025 type = ocfs2_xattr_get_type(entry);
4026 prefix = ocfs2_xattr_prefix(type);
4027
4028 if (prefix) {
4029 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
4030 bucket_xh(bucket),
4031 i,
4032 &block_off,
4033 &new_offset);
4034 if (ret)
4035 break;
4036
4037 name = (const char *)bucket_block(bucket, block_off) +
4038 new_offset;
4039 ret = ocfs2_xattr_list_entry(xl->buffer,
4040 xl->buffer_size,
4041 &xl->result,
4042 prefix, name,
4043 entry->xe_name_len);
4044 if (ret)
4045 break;
4046 }
4047 }
4048
4049 return ret;
4050 }
4051
4052 static int ocfs2_iterate_xattr_index_block(struct inode *inode,
4053 struct buffer_head *blk_bh,
4054 xattr_tree_rec_func *rec_func,
4055 void *para)
4056 {
4057 struct ocfs2_xattr_block *xb =
4058 (struct ocfs2_xattr_block *)blk_bh->b_data;
4059 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
4060 int ret = 0;
4061 u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
4062 u64 p_blkno = 0;
4063
4064 if (!el->l_next_free_rec || !rec_func)
4065 return 0;
4066
4067 while (name_hash > 0) {
4068 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
4069 &e_cpos, &num_clusters, el);
4070 if (ret) {
4071 mlog_errno(ret);
4072 break;
4073 }
4074
4075 ret = rec_func(inode, blk_bh, p_blkno, e_cpos,
4076 num_clusters, para);
4077 if (ret) {
4078 if (ret != -ERANGE)
4079 mlog_errno(ret);
4080 break;
4081 }
4082
4083 if (e_cpos == 0)
4084 break;
4085
4086 name_hash = e_cpos - 1;
4087 }
4088
4089 return ret;
4090
4091 }
4092
4093 static int ocfs2_list_xattr_tree_rec(struct inode *inode,
4094 struct buffer_head *root_bh,
4095 u64 blkno, u32 cpos, u32 len, void *para)
4096 {
4097 return ocfs2_iterate_xattr_buckets(inode, blkno, len,
4098 ocfs2_list_xattr_bucket, para);
4099 }
4100
4101 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
4102 struct buffer_head *blk_bh,
4103 char *buffer,
4104 size_t buffer_size)
4105 {
4106 int ret;
4107 struct ocfs2_xattr_tree_list xl = {
4108 .buffer = buffer,
4109 .buffer_size = buffer_size,
4110 .result = 0,
4111 };
4112
4113 ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
4114 ocfs2_list_xattr_tree_rec, &xl);
4115 if (ret) {
4116 mlog_errno(ret);
4117 goto out;
4118 }
4119
4120 ret = xl.result;
4121 out:
4122 return ret;
4123 }
4124
4125 static int cmp_xe(const void *a, const void *b)
4126 {
4127 const struct ocfs2_xattr_entry *l = a, *r = b;
4128 u32 l_hash = le32_to_cpu(l->xe_name_hash);
4129 u32 r_hash = le32_to_cpu(r->xe_name_hash);
4130
4131 if (l_hash > r_hash)
4132 return 1;
4133 if (l_hash < r_hash)
4134 return -1;
4135 return 0;
4136 }
4137
4138 static void swap_xe(void *a, void *b, int size)
4139 {
4140 struct ocfs2_xattr_entry *l = a, *r = b, tmp;
4141
4142 tmp = *l;
4143 memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
4144 memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
4145 }
4146
4147 /*
4148 * When the ocfs2_xattr_block is filled up, new bucket will be created
4149 * and all the xattr entries will be moved to the new bucket.
4150 * The header goes at the start of the bucket, and the names+values are
4151 * filled from the end. This is why *target starts as the last buffer.
4152 * Note: we need to sort the entries since they are not saved in order
4153 * in the ocfs2_xattr_block.
4154 */
4155 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
4156 struct buffer_head *xb_bh,
4157 struct ocfs2_xattr_bucket *bucket)
4158 {
4159 int i, blocksize = inode->i_sb->s_blocksize;
4160 int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4161 u16 offset, size, off_change;
4162 struct ocfs2_xattr_entry *xe;
4163 struct ocfs2_xattr_block *xb =
4164 (struct ocfs2_xattr_block *)xb_bh->b_data;
4165 struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
4166 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
4167 u16 count = le16_to_cpu(xb_xh->xh_count);
4168 char *src = xb_bh->b_data;
4169 char *target = bucket_block(bucket, blks - 1);
4170
4171 mlog(0, "cp xattr from block %llu to bucket %llu\n",
4172 (unsigned long long)xb_bh->b_blocknr,
4173 (unsigned long long)bucket_blkno(bucket));
4174
4175 for (i = 0; i < blks; i++)
4176 memset(bucket_block(bucket, i), 0, blocksize);
4177
4178 /*
4179 * Since the xe_name_offset is based on ocfs2_xattr_header,
4180 * there is a offset change corresponding to the change of
4181 * ocfs2_xattr_header's position.
4182 */
4183 off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
4184 xe = &xb_xh->xh_entries[count - 1];
4185 offset = le16_to_cpu(xe->xe_name_offset) + off_change;
4186 size = blocksize - offset;
4187
4188 /* copy all the names and values. */
4189 memcpy(target + offset, src + offset, size);
4190
4191 /* Init new header now. */
4192 xh->xh_count = xb_xh->xh_count;
4193 xh->xh_num_buckets = cpu_to_le16(1);
4194 xh->xh_name_value_len = cpu_to_le16(size);
4195 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
4196
4197 /* copy all the entries. */
4198 target = bucket_block(bucket, 0);
4199 offset = offsetof(struct ocfs2_xattr_header, xh_entries);
4200 size = count * sizeof(struct ocfs2_xattr_entry);
4201 memcpy(target + offset, (char *)xb_xh + offset, size);
4202
4203 /* Change the xe offset for all the xe because of the move. */
4204 off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
4205 offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
4206 for (i = 0; i < count; i++)
4207 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
4208
4209 mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n",
4210 offset, size, off_change);
4211
4212 sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
4213 cmp_xe, swap_xe);
4214 }
4215
4216 /*
4217 * After we move xattr from block to index btree, we have to
4218 * update ocfs2_xattr_search to the new xe and base.
4219 *
4220 * When the entry is in xattr block, xattr_bh indicates the storage place.
4221 * While if the entry is in index b-tree, "bucket" indicates the
4222 * real place of the xattr.
4223 */
4224 static void ocfs2_xattr_update_xattr_search(struct inode *inode,
4225 struct ocfs2_xattr_search *xs,
4226 struct buffer_head *old_bh)
4227 {
4228 char *buf = old_bh->b_data;
4229 struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
4230 struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
4231 int i;
4232
4233 xs->header = bucket_xh(xs->bucket);
4234 xs->base = bucket_block(xs->bucket, 0);
4235 xs->end = xs->base + inode->i_sb->s_blocksize;
4236
4237 if (xs->not_found)
4238 return;
4239
4240 i = xs->here - old_xh->xh_entries;
4241 xs->here = &xs->header->xh_entries[i];
4242 }
4243
4244 static int ocfs2_xattr_create_index_block(struct inode *inode,
4245 struct ocfs2_xattr_search *xs,
4246 struct ocfs2_xattr_set_ctxt *ctxt)
4247 {
4248 int ret;
4249 u32 bit_off, len;
4250 u64 blkno;
4251 handle_t *handle = ctxt->handle;
4252 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4253 struct ocfs2_inode_info *oi = OCFS2_I(inode);
4254 struct buffer_head *xb_bh = xs->xattr_bh;
4255 struct ocfs2_xattr_block *xb =
4256 (struct ocfs2_xattr_block *)xb_bh->b_data;
4257 struct ocfs2_xattr_tree_root *xr;
4258 u16 xb_flags = le16_to_cpu(xb->xb_flags);
4259
4260 mlog(0, "create xattr index block for %llu\n",
4261 (unsigned long long)xb_bh->b_blocknr);
4262
4263 BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
4264 BUG_ON(!xs->bucket);
4265
4266 /*
4267 * XXX:
4268 * We can use this lock for now, and maybe move to a dedicated mutex
4269 * if performance becomes a problem later.
4270 */
4271 down_write(&oi->ip_alloc_sem);
4272
4273 ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), xb_bh,
4274 OCFS2_JOURNAL_ACCESS_WRITE);
4275 if (ret) {
4276 mlog_errno(ret);
4277 goto out;
4278 }
4279
4280 ret = __ocfs2_claim_clusters(osb, handle, ctxt->data_ac,
4281 1, 1, &bit_off, &len);
4282 if (ret) {
4283 mlog_errno(ret);
4284 goto out;
4285 }
4286
4287 /*
4288 * The bucket may spread in many blocks, and
4289 * we will only touch the 1st block and the last block
4290 * in the whole bucket(one for entry and one for data).
4291 */
4292 blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
4293
4294 mlog(0, "allocate 1 cluster from %llu to xattr block\n",
4295 (unsigned long long)blkno);
4296
4297 ret = ocfs2_init_xattr_bucket(xs->bucket, blkno);
4298 if (ret) {
4299 mlog_errno(ret);
4300 goto out;
4301 }
4302
4303 ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
4304 OCFS2_JOURNAL_ACCESS_CREATE);
4305 if (ret) {
4306 mlog_errno(ret);
4307 goto out;
4308 }
4309
4310 ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xs->bucket);
4311 ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
4312
4313 ocfs2_xattr_update_xattr_search(inode, xs, xb_bh);
4314
4315 /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
4316 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
4317 offsetof(struct ocfs2_xattr_block, xb_attrs));
4318
4319 xr = &xb->xb_attrs.xb_root;
4320 xr->xt_clusters = cpu_to_le32(1);
4321 xr->xt_last_eb_blk = 0;
4322 xr->xt_list.l_tree_depth = 0;
4323 xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
4324 xr->xt_list.l_next_free_rec = cpu_to_le16(1);
4325
4326 xr->xt_list.l_recs[0].e_cpos = 0;
4327 xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
4328 xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
4329
4330 xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
4331
4332 ocfs2_journal_dirty(handle, xb_bh);
4333
4334 out:
4335 up_write(&oi->ip_alloc_sem);
4336
4337 return ret;
4338 }
4339
4340 static int cmp_xe_offset(const void *a, const void *b)
4341 {
4342 const struct ocfs2_xattr_entry *l = a, *r = b;
4343 u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
4344 u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
4345
4346 if (l_name_offset < r_name_offset)
4347 return 1;
4348 if (l_name_offset > r_name_offset)
4349 return -1;
4350 return 0;
4351 }
4352
4353 /*
4354 * defrag a xattr bucket if we find that the bucket has some
4355 * holes beteen name/value pairs.
4356 * We will move all the name/value pairs to the end of the bucket
4357 * so that we can spare some space for insertion.
4358 */
4359 static int ocfs2_defrag_xattr_bucket(struct inode *inode,
4360 handle_t *handle,
4361 struct ocfs2_xattr_bucket *bucket)
4362 {
4363 int ret, i;
4364 size_t end, offset, len;
4365 struct ocfs2_xattr_header *xh;
4366 char *entries, *buf, *bucket_buf = NULL;
4367 u64 blkno = bucket_blkno(bucket);
4368 u16 xh_free_start;
4369 size_t blocksize = inode->i_sb->s_blocksize;
4370 struct ocfs2_xattr_entry *xe;
4371
4372 /*
4373 * In order to make the operation more efficient and generic,
4374 * we copy all the blocks into a contiguous memory and do the
4375 * defragment there, so if anything is error, we will not touch
4376 * the real block.
4377 */
4378 bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
4379 if (!bucket_buf) {
4380 ret = -EIO;
4381 goto out;
4382 }
4383
4384 buf = bucket_buf;
4385 for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
4386 memcpy(buf, bucket_block(bucket, i), blocksize);
4387
4388 ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
4389 OCFS2_JOURNAL_ACCESS_WRITE);
4390 if (ret < 0) {
4391 mlog_errno(ret);
4392 goto out;
4393 }
4394
4395 xh = (struct ocfs2_xattr_header *)bucket_buf;
4396 entries = (char *)xh->xh_entries;
4397 xh_free_start = le16_to_cpu(xh->xh_free_start);
4398
4399 mlog(0, "adjust xattr bucket in %llu, count = %u, "
4400 "xh_free_start = %u, xh_name_value_len = %u.\n",
4401 (unsigned long long)blkno, le16_to_cpu(xh->xh_count),
4402 xh_free_start, le16_to_cpu(xh->xh_name_value_len));
4403
4404 /*
4405 * sort all the entries by their offset.
4406 * the largest will be the first, so that we can
4407 * move them to the end one by one.
4408 */
4409 sort(entries, le16_to_cpu(xh->xh_count),
4410 sizeof(struct ocfs2_xattr_entry),
4411 cmp_xe_offset, swap_xe);
4412
4413 /* Move all name/values to the end of the bucket. */
4414 xe = xh->xh_entries;
4415 end = OCFS2_XATTR_BUCKET_SIZE;
4416 for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
4417 offset = le16_to_cpu(xe->xe_name_offset);
4418 len = namevalue_size_xe(xe);
4419
4420 /*
4421 * We must make sure that the name/value pair
4422 * exist in the same block. So adjust end to
4423 * the previous block end if needed.
4424 */
4425 if (((end - len) / blocksize !=
4426 (end - 1) / blocksize))
4427 end = end - end % blocksize;
4428
4429 if (end > offset + len) {
4430 memmove(bucket_buf + end - len,
4431 bucket_buf + offset, len);
4432 xe->xe_name_offset = cpu_to_le16(end - len);
4433 }
4434
4435 mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
4436 "bucket %llu\n", (unsigned long long)blkno);
4437
4438 end -= len;
4439 }
4440
4441 mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
4442 "bucket %llu\n", (unsigned long long)blkno);
4443
4444 if (xh_free_start == end)
4445 goto out;
4446
4447 memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
4448 xh->xh_free_start = cpu_to_le16(end);
4449
4450 /* sort the entries by their name_hash. */
4451 sort(entries, le16_to_cpu(xh->xh_count),
4452 sizeof(struct ocfs2_xattr_entry),
4453 cmp_xe, swap_xe);
4454
4455 buf = bucket_buf;
4456 for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
4457 memcpy(bucket_block(bucket, i), buf, blocksize);
4458 ocfs2_xattr_bucket_journal_dirty(handle, bucket);
4459
4460 out:
4461 kfree(bucket_buf);
4462 return ret;
4463 }
4464
4465 /*
4466 * prev_blkno points to the start of an existing extent. new_blkno
4467 * points to a newly allocated extent. Because we know each of our
4468 * clusters contains more than bucket, we can easily split one cluster
4469 * at a bucket boundary. So we take the last cluster of the existing
4470 * extent and split it down the middle. We move the last half of the
4471 * buckets in the last cluster of the existing extent over to the new
4472 * extent.
4473 *
4474 * first_bh is the buffer at prev_blkno so we can update the existing
4475 * extent's bucket count. header_bh is the bucket were we were hoping
4476 * to insert our xattr. If the bucket move places the target in the new
4477 * extent, we'll update first_bh and header_bh after modifying the old
4478 * extent.
4479 *
4480 * first_hash will be set as the 1st xe's name_hash in the new extent.
4481 */
4482 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
4483 handle_t *handle,
4484 struct ocfs2_xattr_bucket *first,
4485 struct ocfs2_xattr_bucket *target,
4486 u64 new_blkno,
4487 u32 num_clusters,
4488 u32 *first_hash)
4489 {
4490 int ret;
4491 struct super_block *sb = inode->i_sb;
4492 int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(sb);
4493 int num_buckets = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(sb));
4494 int to_move = num_buckets / 2;
4495 u64 src_blkno;
4496 u64 last_cluster_blkno = bucket_blkno(first) +
4497 ((num_clusters - 1) * ocfs2_clusters_to_blocks(sb, 1));
4498
4499 BUG_ON(le16_to_cpu(bucket_xh(first)->xh_num_buckets) < num_buckets);
4500 BUG_ON(OCFS2_XATTR_BUCKET_SIZE == OCFS2_SB(sb)->s_clustersize);
4501
4502 mlog(0, "move half of xattrs in cluster %llu to %llu\n",
4503 (unsigned long long)last_cluster_blkno, (unsigned long long)new_blkno);
4504
4505 ret = ocfs2_mv_xattr_buckets(inode, handle, bucket_blkno(first),
4506 last_cluster_blkno, new_blkno,
4507 to_move, first_hash);
4508 if (ret) {
4509 mlog_errno(ret);
4510 goto out;
4511 }
4512
4513 /* This is the first bucket that got moved */
4514 src_blkno = last_cluster_blkno + (to_move * blks_per_bucket);
4515
4516 /*
4517 * If the target bucket was part of the moved buckets, we need to
4518 * update first and target.
4519 */
4520 if (bucket_blkno(target) >= src_blkno) {
4521 /* Find the block for the new target bucket */
4522 src_blkno = new_blkno +
4523 (bucket_blkno(target) - src_blkno);
4524
4525 ocfs2_xattr_bucket_relse(first);
4526 ocfs2_xattr_bucket_relse(target);
4527
4528 /*
4529 * These shouldn't fail - the buffers are in the
4530 * journal from ocfs2_cp_xattr_bucket().
4531 */
4532 ret = ocfs2_read_xattr_bucket(first, new_blkno);
4533 if (ret) {
4534 mlog_errno(ret);
4535 goto out;
4536 }
4537 ret = ocfs2_read_xattr_bucket(target, src_blkno);
4538 if (ret)
4539 mlog_errno(ret);
4540
4541 }
4542
4543 out:
4544 return ret;
4545 }
4546
4547 /*
4548 * Find the suitable pos when we divide a bucket into 2.
4549 * We have to make sure the xattrs with the same hash value exist
4550 * in the same bucket.
4551 *
4552 * If this ocfs2_xattr_header covers more than one hash value, find a
4553 * place where the hash value changes. Try to find the most even split.
4554 * The most common case is that all entries have different hash values,
4555 * and the first check we make will find a place to split.
4556 */
4557 static int ocfs2_xattr_find_divide_pos(struct ocfs2_xattr_header *xh)
4558 {
4559 struct ocfs2_xattr_entry *entries = xh->xh_entries;
4560 int count = le16_to_cpu(xh->xh_count);
4561 int delta, middle = count / 2;
4562
4563 /*
4564 * We start at the middle. Each step gets farther away in both
4565 * directions. We therefore hit the change in hash value
4566 * nearest to the middle. Note that this loop does not execute for
4567 * count < 2.
4568 */
4569 for (delta = 0; delta < middle; delta++) {
4570 /* Let's check delta earlier than middle */
4571 if (cmp_xe(&entries[middle - delta - 1],
4572 &entries[middle - delta]))
4573 return middle - delta;
4574
4575 /* For even counts, don't walk off the end */
4576 if ((middle + delta + 1) == count)
4577 continue;
4578
4579 /* Now try delta past middle */
4580 if (cmp_xe(&entries[middle + delta],
4581 &entries[middle + delta + 1]))
4582 return middle + delta + 1;
4583 }
4584
4585 /* Every entry had the same hash */
4586 return count;
4587 }
4588
4589 /*
4590 * Move some xattrs in old bucket(blk) to new bucket(new_blk).
4591 * first_hash will record the 1st hash of the new bucket.
4592 *
4593 * Normally half of the xattrs will be moved. But we have to make
4594 * sure that the xattrs with the same hash value are stored in the
4595 * same bucket. If all the xattrs in this bucket have the same hash
4596 * value, the new bucket will be initialized as an empty one and the
4597 * first_hash will be initialized as (hash_value+1).
4598 */
4599 static int ocfs2_divide_xattr_bucket(struct inode *inode,
4600 handle_t *handle,
4601 u64 blk,
4602 u64 new_blk,
4603 u32 *first_hash,
4604 int new_bucket_head)
4605 {
4606 int ret, i;
4607 int count, start, len, name_value_len = 0, name_offset = 0;
4608 struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
4609 struct ocfs2_xattr_header *xh;
4610 struct ocfs2_xattr_entry *xe;
4611 int blocksize = inode->i_sb->s_blocksize;
4612
4613 mlog(0, "move some of xattrs from bucket %llu to %llu\n",
4614 (unsigned long long)blk, (unsigned long long)new_blk);
4615
4616 s_bucket = ocfs2_xattr_bucket_new(inode);
4617 t_bucket = ocfs2_xattr_bucket_new(inode);
4618 if (!s_bucket || !t_bucket) {
4619 ret = -ENOMEM;
4620 mlog_errno(ret);
4621 goto out;
4622 }
4623
4624 ret = ocfs2_read_xattr_bucket(s_bucket, blk);
4625 if (ret) {
4626 mlog_errno(ret);
4627 goto out;
4628 }
4629
4630 ret = ocfs2_xattr_bucket_journal_access(handle, s_bucket,
4631 OCFS2_JOURNAL_ACCESS_WRITE);
4632 if (ret) {
4633 mlog_errno(ret);
4634 goto out;
4635 }
4636
4637 /*
4638 * Even if !new_bucket_head, we're overwriting t_bucket. Thus,
4639 * there's no need to read it.
4640 */
4641 ret = ocfs2_init_xattr_bucket(t_bucket, new_blk);
4642 if (ret) {
4643 mlog_errno(ret);
4644 goto out;
4645 }
4646
4647 /*
4648 * Hey, if we're overwriting t_bucket, what difference does
4649 * ACCESS_CREATE vs ACCESS_WRITE make? See the comment in the
4650 * same part of ocfs2_cp_xattr_bucket().
4651 */
4652 ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4653 new_bucket_head ?
4654 OCFS2_JOURNAL_ACCESS_CREATE :
4655 OCFS2_JOURNAL_ACCESS_WRITE);
4656 if (ret) {
4657 mlog_errno(ret);
4658 goto out;
4659 }
4660
4661 xh = bucket_xh(s_bucket);
4662 count = le16_to_cpu(xh->xh_count);
4663 start = ocfs2_xattr_find_divide_pos(xh);
4664
4665 if (start == count) {
4666 xe = &xh->xh_entries[start-1];
4667
4668 /*
4669 * initialized a new empty bucket here.
4670 * The hash value is set as one larger than
4671 * that of the last entry in the previous bucket.
4672 */
4673 for (i = 0; i < t_bucket->bu_blocks; i++)
4674 memset(bucket_block(t_bucket, i), 0, blocksize);
4675
4676 xh = bucket_xh(t_bucket);
4677 xh->xh_free_start = cpu_to_le16(blocksize);
4678 xh->xh_entries[0].xe_name_hash = xe->xe_name_hash;
4679 le32_add_cpu(&xh->xh_entries[0].xe_name_hash, 1);
4680
4681 goto set_num_buckets;
4682 }
4683
4684 /* copy the whole bucket to the new first. */
4685 ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4686
4687 /* update the new bucket. */
4688 xh = bucket_xh(t_bucket);
4689
4690 /*
4691 * Calculate the total name/value len and xh_free_start for
4692 * the old bucket first.
4693 */
4694 name_offset = OCFS2_XATTR_BUCKET_SIZE;
4695 name_value_len = 0;
4696 for (i = 0; i < start; i++) {
4697 xe = &xh->xh_entries[i];
4698 name_value_len += namevalue_size_xe(xe);
4699 if (le16_to_cpu(xe->xe_name_offset) < name_offset)
4700 name_offset = le16_to_cpu(xe->xe_name_offset);
4701 }
4702
4703 /*
4704 * Now begin the modification to the new bucket.
4705 *
4706 * In the new bucket, We just move the xattr entry to the beginning
4707 * and don't touch the name/value. So there will be some holes in the
4708 * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
4709 * called.
4710 */
4711 xe = &xh->xh_entries[start];
4712 len = sizeof(struct ocfs2_xattr_entry) * (count - start);
4713 mlog(0, "mv xattr entry len %d from %d to %d\n", len,
4714 (int)((char *)xe - (char *)xh),
4715 (int)((char *)xh->xh_entries - (char *)xh));
4716 memmove((char *)xh->xh_entries, (char *)xe, len);
4717 xe = &xh->xh_entries[count - start];
4718 len = sizeof(struct ocfs2_xattr_entry) * start;
4719 memset((char *)xe, 0, len);
4720
4721 le16_add_cpu(&xh->xh_count, -start);
4722 le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
4723
4724 /* Calculate xh_free_start for the new bucket. */
4725 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
4726 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
4727 xe = &xh->xh_entries[i];
4728 if (le16_to_cpu(xe->xe_name_offset) <
4729 le16_to_cpu(xh->xh_free_start))
4730 xh->xh_free_start = xe->xe_name_offset;
4731 }
4732
4733 set_num_buckets:
4734 /* set xh->xh_num_buckets for the new xh. */
4735 if (new_bucket_head)
4736 xh->xh_num_buckets = cpu_to_le16(1);
4737 else
4738 xh->xh_num_buckets = 0;
4739
4740 ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4741
4742 /* store the first_hash of the new bucket. */
4743 if (first_hash)
4744 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
4745
4746 /*
4747 * Now only update the 1st block of the old bucket. If we
4748 * just added a new empty bucket, there is no need to modify
4749 * it.
4750 */
4751 if (start == count)
4752 goto out;
4753
4754 xh = bucket_xh(s_bucket);
4755 memset(&xh->xh_entries[start], 0,
4756 sizeof(struct ocfs2_xattr_entry) * (count - start));
4757 xh->xh_count = cpu_to_le16(start);
4758 xh->xh_free_start = cpu_to_le16(name_offset);
4759 xh->xh_name_value_len = cpu_to_le16(name_value_len);
4760
4761 ocfs2_xattr_bucket_journal_dirty(handle, s_bucket);
4762
4763 out:
4764 ocfs2_xattr_bucket_free(s_bucket);
4765 ocfs2_xattr_bucket_free(t_bucket);
4766
4767 return ret;
4768 }
4769
4770 /*
4771 * Copy xattr from one bucket to another bucket.
4772 *
4773 * The caller must make sure that the journal transaction
4774 * has enough space for journaling.
4775 */
4776 static int ocfs2_cp_xattr_bucket(struct inode *inode,
4777 handle_t *handle,
4778 u64 s_blkno,
4779 u64 t_blkno,
4780 int t_is_new)
4781 {
4782 int ret;
4783 struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
4784
4785 BUG_ON(s_blkno == t_blkno);
4786
4787 mlog(0, "cp bucket %llu to %llu, target is %d\n",
4788 (unsigned long long)s_blkno, (unsigned long long)t_blkno,
4789 t_is_new);
4790
4791 s_bucket = ocfs2_xattr_bucket_new(inode);
4792 t_bucket = ocfs2_xattr_bucket_new(inode);
4793 if (!s_bucket || !t_bucket) {
4794 ret = -ENOMEM;
4795 mlog_errno(ret);
4796 goto out;
4797 }
4798
4799 ret = ocfs2_read_xattr_bucket(s_bucket, s_blkno);
4800 if (ret)
4801 goto out;
4802
4803 /*
4804 * Even if !t_is_new, we're overwriting t_bucket. Thus,
4805 * there's no need to read it.
4806 */
4807 ret = ocfs2_init_xattr_bucket(t_bucket, t_blkno);
4808 if (ret)
4809 goto out;
4810
4811 /*
4812 * Hey, if we're overwriting t_bucket, what difference does
4813 * ACCESS_CREATE vs ACCESS_WRITE make? Well, if we allocated a new
4814 * cluster to fill, we came here from
4815 * ocfs2_mv_xattr_buckets(), and it is really new -
4816 * ACCESS_CREATE is required. But we also might have moved data
4817 * out of t_bucket before extending back into it.
4818 * ocfs2_add_new_xattr_bucket() can do this - its call to
4819 * ocfs2_add_new_xattr_cluster() may have created a new extent
4820 * and copied out the end of the old extent. Then it re-extends
4821 * the old extent back to create space for new xattrs. That's
4822 * how we get here, and the bucket isn't really new.
4823 */
4824 ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4825 t_is_new ?
4826 OCFS2_JOURNAL_ACCESS_CREATE :
4827 OCFS2_JOURNAL_ACCESS_WRITE);
4828 if (ret)
4829 goto out;
4830
4831 ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4832 ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4833
4834 out:
4835 ocfs2_xattr_bucket_free(t_bucket);
4836 ocfs2_xattr_bucket_free(s_bucket);
4837
4838 return ret;
4839 }
4840
4841 /*
4842 * src_blk points to the start of an existing extent. last_blk points to
4843 * last cluster in that extent. to_blk points to a newly allocated
4844 * extent. We copy the buckets from the cluster at last_blk to the new
4845 * extent. If start_bucket is non-zero, we skip that many buckets before
4846 * we start copying. The new extent's xh_num_buckets gets set to the
4847 * number of buckets we copied. The old extent's xh_num_buckets shrinks
4848 * by the same amount.
4849 */
4850 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
4851 u64 src_blk, u64 last_blk, u64 to_blk,
4852 unsigned int start_bucket,
4853 u32 *first_hash)
4854 {
4855 int i, ret, credits;
4856 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4857 int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4858 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
4859 struct ocfs2_xattr_bucket *old_first, *new_first;
4860
4861 mlog(0, "mv xattrs from cluster %llu to %llu\n",
4862 (unsigned long long)last_blk, (unsigned long long)to_blk);
4863
4864 BUG_ON(start_bucket >= num_buckets);
4865 if (start_bucket) {
4866 num_buckets -= start_bucket;
4867 last_blk += (start_bucket * blks_per_bucket);
4868 }
4869
4870 /* The first bucket of the original extent */
4871 old_first = ocfs2_xattr_bucket_new(inode);
4872 /* The first bucket of the new extent */
4873 new_first = ocfs2_xattr_bucket_new(inode);
4874 if (!old_first || !new_first) {
4875 ret = -ENOMEM;
4876 mlog_errno(ret);
4877 goto out;
4878 }
4879
4880 ret = ocfs2_read_xattr_bucket(old_first, src_blk);
4881 if (ret) {
4882 mlog_errno(ret);
4883 goto out;
4884 }
4885
4886 /*
4887 * We need to update the first bucket of the old extent and all
4888 * the buckets going to the new extent.
4889 */
4890 credits = ((num_buckets + 1) * blks_per_bucket) +
4891 handle->h_buffer_credits;
4892 ret = ocfs2_extend_trans(handle, credits);
4893 if (ret) {
4894 mlog_errno(ret);
4895 goto out;
4896 }
4897
4898 ret = ocfs2_xattr_bucket_journal_access(handle, old_first,
4899 OCFS2_JOURNAL_ACCESS_WRITE);
4900 if (ret) {
4901 mlog_errno(ret);
4902 goto out;
4903 }
4904
4905 for (i = 0; i < num_buckets; i++) {
4906 ret = ocfs2_cp_xattr_bucket(inode, handle,
4907 last_blk + (i * blks_per_bucket),
4908 to_blk + (i * blks_per_bucket),
4909 1);
4910 if (ret) {
4911 mlog_errno(ret);
4912 goto out;
4913 }
4914 }
4915
4916 /*
4917 * Get the new bucket ready before we dirty anything
4918 * (This actually shouldn't fail, because we already dirtied
4919 * it once in ocfs2_cp_xattr_bucket()).
4920 */
4921 ret = ocfs2_read_xattr_bucket(new_first, to_blk);
4922 if (ret) {
4923 mlog_errno(ret);
4924 goto out;
4925 }
4926 ret = ocfs2_xattr_bucket_journal_access(handle, new_first,
4927 OCFS2_JOURNAL_ACCESS_WRITE);
4928 if (ret) {
4929 mlog_errno(ret);
4930 goto out;
4931 }
4932
4933 /* Now update the headers */
4934 le16_add_cpu(&bucket_xh(old_first)->xh_num_buckets, -num_buckets);
4935 ocfs2_xattr_bucket_journal_dirty(handle, old_first);
4936
4937 bucket_xh(new_first)->xh_num_buckets = cpu_to_le16(num_buckets);
4938 ocfs2_xattr_bucket_journal_dirty(handle, new_first);
4939
4940 if (first_hash)
4941 *first_hash = le32_to_cpu(bucket_xh(new_first)->xh_entries[0].xe_name_hash);
4942
4943 out:
4944 ocfs2_xattr_bucket_free(new_first);
4945 ocfs2_xattr_bucket_free(old_first);
4946 return ret;
4947 }
4948
4949 /*
4950 * Move some xattrs in this cluster to the new cluster.
4951 * This function should only be called when bucket size == cluster size.
4952 * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
4953 */
4954 static int ocfs2_divide_xattr_cluster(struct inode *inode,
4955 handle_t *handle,
4956 u64 prev_blk,
4957 u64 new_blk,
4958 u32 *first_hash)
4959 {
4960 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4961 int ret, credits = 2 * blk_per_bucket + handle->h_buffer_credits;
4962
4963 BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
4964
4965 ret = ocfs2_extend_trans(handle, credits);
4966 if (ret) {
4967 mlog_errno(ret);
4968 return ret;
4969 }
4970
4971 /* Move half of the xattr in start_blk to the next bucket. */
4972 return ocfs2_divide_xattr_bucket(inode, handle, prev_blk,
4973 new_blk, first_hash, 1);
4974 }
4975
4976 /*
4977 * Move some xattrs from the old cluster to the new one since they are not
4978 * contiguous in ocfs2 xattr tree.
4979 *
4980 * new_blk starts a new separate cluster, and we will move some xattrs from
4981 * prev_blk to it. v_start will be set as the first name hash value in this
4982 * new cluster so that it can be used as e_cpos during tree insertion and
4983 * don't collide with our original b-tree operations. first_bh and header_bh
4984 * will also be updated since they will be used in ocfs2_extend_xattr_bucket
4985 * to extend the insert bucket.
4986 *
4987 * The problem is how much xattr should we move to the new one and when should
4988 * we update first_bh and header_bh?
4989 * 1. If cluster size > bucket size, that means the previous cluster has more
4990 * than 1 bucket, so just move half nums of bucket into the new cluster and
4991 * update the first_bh and header_bh if the insert bucket has been moved
4992 * to the new cluster.
4993 * 2. If cluster_size == bucket_size:
4994 * a) If the previous extent rec has more than one cluster and the insert
4995 * place isn't in the last cluster, copy the entire last cluster to the
4996 * new one. This time, we don't need to upate the first_bh and header_bh
4997 * since they will not be moved into the new cluster.
4998 * b) Otherwise, move the bottom half of the xattrs in the last cluster into
4999 * the new one. And we set the extend flag to zero if the insert place is
5000 * moved into the new allocated cluster since no extend is needed.
5001 */
5002 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
5003 handle_t *handle,
5004 struct ocfs2_xattr_bucket *first,
5005 struct ocfs2_xattr_bucket *target,
5006 u64 new_blk,
5007 u32 prev_clusters,
5008 u32 *v_start,
5009 int *extend)
5010 {
5011 int ret;
5012
5013 mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n",
5014 (unsigned long long)bucket_blkno(first), prev_clusters,
5015 (unsigned long long)new_blk);
5016
5017 if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1) {
5018 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
5019 handle,
5020 first, target,
5021 new_blk,
5022 prev_clusters,
5023 v_start);
5024 if (ret)
5025 mlog_errno(ret);
5026 } else {
5027 /* The start of the last cluster in the first extent */
5028 u64 last_blk = bucket_blkno(first) +
5029 ((prev_clusters - 1) *
5030 ocfs2_clusters_to_blocks(inode->i_sb, 1));
5031
5032 if (prev_clusters > 1 && bucket_blkno(target) != last_blk) {
5033 ret = ocfs2_mv_xattr_buckets(inode, handle,
5034 bucket_blkno(first),
5035 last_blk, new_blk, 0,
5036 v_start);
5037 if (ret)
5038 mlog_errno(ret);
5039 } else {
5040 ret = ocfs2_divide_xattr_cluster(inode, handle,
5041 last_blk, new_blk,
5042 v_start);
5043 if (ret)
5044 mlog_errno(ret);
5045
5046 if ((bucket_blkno(target) == last_blk) && extend)
5047 *extend = 0;
5048 }
5049 }
5050
5051 return ret;
5052 }
5053
5054 /*
5055 * Add a new cluster for xattr storage.
5056 *
5057 * If the new cluster is contiguous with the previous one, it will be
5058 * appended to the same extent record, and num_clusters will be updated.
5059 * If not, we will insert a new extent for it and move some xattrs in
5060 * the last cluster into the new allocated one.
5061 * We also need to limit the maximum size of a btree leaf, otherwise we'll
5062 * lose the benefits of hashing because we'll have to search large leaves.
5063 * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
5064 * if it's bigger).
5065 *
5066 * first_bh is the first block of the previous extent rec and header_bh
5067 * indicates the bucket we will insert the new xattrs. They will be updated
5068 * when the header_bh is moved into the new cluster.
5069 */
5070 static int ocfs2_add_new_xattr_cluster(struct inode *inode,
5071 struct buffer_head *root_bh,
5072 struct ocfs2_xattr_bucket *first,
5073 struct ocfs2_xattr_bucket *target,
5074 u32 *num_clusters,
5075 u32 prev_cpos,
5076 int *extend,
5077 struct ocfs2_xattr_set_ctxt *ctxt)
5078 {
5079 int ret;
5080 u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
5081 u32 prev_clusters = *num_clusters;
5082 u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
5083 u64 block;
5084 handle_t *handle = ctxt->handle;
5085 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5086 struct ocfs2_extent_tree et;
5087
5088 mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, "
5089 "previous xattr blkno = %llu\n",
5090 (unsigned long long)OCFS2_I(inode)->ip_blkno,
5091 prev_cpos, (unsigned long long)bucket_blkno(first));
5092
5093 ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
5094
5095 ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
5096 OCFS2_JOURNAL_ACCESS_WRITE);
5097 if (ret < 0) {
5098 mlog_errno(ret);
5099 goto leave;
5100 }
5101
5102 ret = __ocfs2_claim_clusters(osb, handle, ctxt->data_ac, 1,
5103 clusters_to_add, &bit_off, &num_bits);
5104 if (ret < 0) {
5105 if (ret != -ENOSPC)
5106 mlog_errno(ret);
5107 goto leave;
5108 }
5109
5110 BUG_ON(num_bits > clusters_to_add);
5111
5112 block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
5113 mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n",
5114 num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
5115
5116 if (bucket_blkno(first) + (prev_clusters * bpc) == block &&
5117 (prev_clusters + num_bits) << osb->s_clustersize_bits <=
5118 OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
5119 /*
5120 * If this cluster is contiguous with the old one and
5121 * adding this new cluster, we don't surpass the limit of
5122 * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
5123 * initialized and used like other buckets in the previous
5124 * cluster.
5125 * So add it as a contiguous one. The caller will handle
5126 * its init process.
5127 */
5128 v_start = prev_cpos + prev_clusters;
5129 *num_clusters = prev_clusters + num_bits;
5130 mlog(0, "Add contiguous %u clusters to previous extent rec.\n",
5131 num_bits);
5132 } else {
5133 ret = ocfs2_adjust_xattr_cross_cluster(inode,
5134 handle,
5135 first,
5136 target,
5137 block,
5138 prev_clusters,
5139 &v_start,
5140 extend);
5141 if (ret) {
5142 mlog_errno(ret);
5143 goto leave;
5144 }
5145 }
5146
5147 mlog(0, "Insert %u clusters at block %llu for xattr at %u\n",
5148 num_bits, (unsigned long long)block, v_start);
5149 ret = ocfs2_insert_extent(handle, &et, v_start, block,
5150 num_bits, 0, ctxt->meta_ac);
5151 if (ret < 0) {
5152 mlog_errno(ret);
5153 goto leave;
5154 }
5155
5156 ret = ocfs2_journal_dirty(handle, root_bh);
5157 if (ret < 0)
5158 mlog_errno(ret);
5159
5160 leave:
5161 return ret;
5162 }
5163
5164 /*
5165 * We are given an extent. 'first' is the bucket at the very front of
5166 * the extent. The extent has space for an additional bucket past
5167 * bucket_xh(first)->xh_num_buckets. 'target_blkno' is the block number
5168 * of the target bucket. We wish to shift every bucket past the target
5169 * down one, filling in that additional space. When we get back to the
5170 * target, we split the target between itself and the now-empty bucket
5171 * at target+1 (aka, target_blkno + blks_per_bucket).
5172 */
5173 static int ocfs2_extend_xattr_bucket(struct inode *inode,
5174 handle_t *handle,
5175 struct ocfs2_xattr_bucket *first,
5176 u64 target_blk,
5177 u32 num_clusters)
5178 {
5179 int ret, credits;
5180 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5181 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5182 u64 end_blk;
5183 u16 new_bucket = le16_to_cpu(bucket_xh(first)->xh_num_buckets);
5184
5185 mlog(0, "extend xattr bucket in %llu, xattr extend rec starting "
5186 "from %llu, len = %u\n", (unsigned long long)target_blk,
5187 (unsigned long long)bucket_blkno(first), num_clusters);
5188
5189 /* The extent must have room for an additional bucket */
5190 BUG_ON(new_bucket >=
5191 (num_clusters * ocfs2_xattr_buckets_per_cluster(osb)));
5192
5193 /* end_blk points to the last existing bucket */
5194 end_blk = bucket_blkno(first) + ((new_bucket - 1) * blk_per_bucket);
5195
5196 /*
5197 * end_blk is the start of the last existing bucket.
5198 * Thus, (end_blk - target_blk) covers the target bucket and
5199 * every bucket after it up to, but not including, the last
5200 * existing bucket. Then we add the last existing bucket, the
5201 * new bucket, and the first bucket (3 * blk_per_bucket).
5202 */
5203 credits = (end_blk - target_blk) + (3 * blk_per_bucket) +
5204 handle->h_buffer_credits;
5205 ret = ocfs2_extend_trans(handle, credits);
5206 if (ret) {
5207 mlog_errno(ret);
5208 goto out;
5209 }
5210
5211 ret = ocfs2_xattr_bucket_journal_access(handle, first,
5212 OCFS2_JOURNAL_ACCESS_WRITE);
5213 if (ret) {
5214 mlog_errno(ret);
5215 goto out;
5216 }
5217
5218 while (end_blk != target_blk) {
5219 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
5220 end_blk + blk_per_bucket, 0);
5221 if (ret)
5222 goto out;
5223 end_blk -= blk_per_bucket;
5224 }
5225
5226 /* Move half of the xattr in target_blkno to the next bucket. */
5227 ret = ocfs2_divide_xattr_bucket(inode, handle, target_blk,
5228 target_blk + blk_per_bucket, NULL, 0);
5229
5230 le16_add_cpu(&bucket_xh(first)->xh_num_buckets, 1);
5231 ocfs2_xattr_bucket_journal_dirty(handle, first);
5232
5233 out:
5234 return ret;
5235 }
5236
5237 /*
5238 * Add new xattr bucket in an extent record and adjust the buckets
5239 * accordingly. xb_bh is the ocfs2_xattr_block, and target is the
5240 * bucket we want to insert into.
5241 *
5242 * In the easy case, we will move all the buckets after target down by
5243 * one. Half of target's xattrs will be moved to the next bucket.
5244 *
5245 * If current cluster is full, we'll allocate a new one. This may not
5246 * be contiguous. The underlying calls will make sure that there is
5247 * space for the insert, shifting buckets around if necessary.
5248 * 'target' may be moved by those calls.
5249 */
5250 static int ocfs2_add_new_xattr_bucket(struct inode *inode,
5251 struct buffer_head *xb_bh,
5252 struct ocfs2_xattr_bucket *target,
5253 struct ocfs2_xattr_set_ctxt *ctxt)
5254 {
5255 struct ocfs2_xattr_block *xb =
5256 (struct ocfs2_xattr_block *)xb_bh->b_data;
5257 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
5258 struct ocfs2_extent_list *el = &xb_root->xt_list;
5259 u32 name_hash =
5260 le32_to_cpu(bucket_xh(target)->xh_entries[0].xe_name_hash);
5261 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5262 int ret, num_buckets, extend = 1;
5263 u64 p_blkno;
5264 u32 e_cpos, num_clusters;
5265 /* The bucket at the front of the extent */
5266 struct ocfs2_xattr_bucket *first;
5267
5268 mlog(0, "Add new xattr bucket starting from %llu\n",
5269 (unsigned long long)bucket_blkno(target));
5270
5271 /* The first bucket of the original extent */
5272 first = ocfs2_xattr_bucket_new(inode);
5273 if (!first) {
5274 ret = -ENOMEM;
5275 mlog_errno(ret);
5276 goto out;
5277 }
5278
5279 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
5280 &num_clusters, el);
5281 if (ret) {
5282 mlog_errno(ret);
5283 goto out;
5284 }
5285
5286 ret = ocfs2_read_xattr_bucket(first, p_blkno);
5287 if (ret) {
5288 mlog_errno(ret);
5289 goto out;
5290 }
5291
5292 num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
5293 if (num_buckets == le16_to_cpu(bucket_xh(first)->xh_num_buckets)) {
5294 /*
5295 * This can move first+target if the target bucket moves
5296 * to the new extent.
5297 */
5298 ret = ocfs2_add_new_xattr_cluster(inode,
5299 xb_bh,
5300 first,
5301 target,
5302 &num_clusters,
5303 e_cpos,
5304 &extend,
5305 ctxt);
5306 if (ret) {
5307 mlog_errno(ret);
5308 goto out;
5309 }
5310 }
5311
5312 if (extend) {
5313 ret = ocfs2_extend_xattr_bucket(inode,
5314 ctxt->handle,
5315 first,
5316 bucket_blkno(target),
5317 num_clusters);
5318 if (ret)
5319 mlog_errno(ret);
5320 }
5321
5322 out:
5323 ocfs2_xattr_bucket_free(first);
5324
5325 return ret;
5326 }
5327
5328 static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode,
5329 struct ocfs2_xattr_bucket *bucket,
5330 int offs)
5331 {
5332 int block_off = offs >> inode->i_sb->s_blocksize_bits;
5333
5334 offs = offs % inode->i_sb->s_blocksize;
5335 return bucket_block(bucket, block_off) + offs;
5336 }
5337
5338 /*
5339 * Truncate the specified xe_off entry in xattr bucket.
5340 * bucket is indicated by header_bh and len is the new length.
5341 * Both the ocfs2_xattr_value_root and the entry will be updated here.
5342 *
5343 * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
5344 */
5345 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
5346 struct ocfs2_xattr_bucket *bucket,
5347 int xe_off,
5348 int len,
5349 struct ocfs2_xattr_set_ctxt *ctxt)
5350 {
5351 int ret, offset;
5352 u64 value_blk;
5353 struct ocfs2_xattr_entry *xe;
5354 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5355 size_t blocksize = inode->i_sb->s_blocksize;
5356 struct ocfs2_xattr_value_buf vb = {
5357 .vb_access = ocfs2_journal_access,
5358 };
5359
5360 xe = &xh->xh_entries[xe_off];
5361
5362 BUG_ON(!xe || ocfs2_xattr_is_local(xe));
5363
5364 offset = le16_to_cpu(xe->xe_name_offset) +
5365 OCFS2_XATTR_SIZE(xe->xe_name_len);
5366
5367 value_blk = offset / blocksize;
5368
5369 /* We don't allow ocfs2_xattr_value to be stored in different block. */
5370 BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
5371
5372 vb.vb_bh = bucket->bu_bhs[value_blk];
5373 BUG_ON(!vb.vb_bh);
5374
5375 vb.vb_xv = (struct ocfs2_xattr_value_root *)
5376 (vb.vb_bh->b_data + offset % blocksize);
5377
5378 /*
5379 * From here on out we have to dirty the bucket. The generic
5380 * value calls only modify one of the bucket's bhs, but we need
5381 * to send the bucket at once. So if they error, they *could* have
5382 * modified something. We have to assume they did, and dirty
5383 * the whole bucket. This leaves us in a consistent state.
5384 */
5385 mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n",
5386 xe_off, (unsigned long long)bucket_blkno(bucket), len);
5387 ret = ocfs2_xattr_value_truncate(inode, &vb, len, ctxt);
5388 if (ret) {
5389 mlog_errno(ret);
5390 goto out;
5391 }
5392
5393 ret = ocfs2_xattr_bucket_journal_access(ctxt->handle, bucket,
5394 OCFS2_JOURNAL_ACCESS_WRITE);
5395 if (ret) {
5396 mlog_errno(ret);
5397 goto out;
5398 }
5399
5400 xe->xe_value_size = cpu_to_le64(len);
5401
5402 ocfs2_xattr_bucket_journal_dirty(ctxt->handle, bucket);
5403
5404 out:
5405 return ret;
5406 }
5407
5408 static int ocfs2_rm_xattr_cluster(struct inode *inode,
5409 struct buffer_head *root_bh,
5410 u64 blkno,
5411 u32 cpos,
5412 u32 len,
5413 void *para)
5414 {
5415 int ret;
5416 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5417 struct inode *tl_inode = osb->osb_tl_inode;
5418 handle_t *handle;
5419 struct ocfs2_xattr_block *xb =
5420 (struct ocfs2_xattr_block *)root_bh->b_data;
5421 struct ocfs2_alloc_context *meta_ac = NULL;
5422 struct ocfs2_cached_dealloc_ctxt dealloc;
5423 struct ocfs2_extent_tree et;
5424
5425 ret = ocfs2_iterate_xattr_buckets(inode, blkno, len,
5426 ocfs2_delete_xattr_in_bucket, para);
5427 if (ret) {
5428 mlog_errno(ret);
5429 return ret;
5430 }
5431
5432 ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
5433
5434 ocfs2_init_dealloc_ctxt(&dealloc);
5435
5436 mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n",
5437 cpos, len, (unsigned long long)blkno);
5438
5439 ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode), blkno,
5440 len);
5441
5442 ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
5443 if (ret) {
5444 mlog_errno(ret);
5445 return ret;
5446 }
5447
5448 mutex_lock(&tl_inode->i_mutex);
5449
5450 if (ocfs2_truncate_log_needs_flush(osb)) {
5451 ret = __ocfs2_flush_truncate_log(osb);
5452 if (ret < 0) {
5453 mlog_errno(ret);
5454 goto out;
5455 }
5456 }
5457
5458 handle = ocfs2_start_trans(osb, ocfs2_remove_extent_credits(osb->sb));
5459 if (IS_ERR(handle)) {
5460 ret = -ENOMEM;
5461 mlog_errno(ret);
5462 goto out;
5463 }
5464
5465 ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
5466 OCFS2_JOURNAL_ACCESS_WRITE);
5467 if (ret) {
5468 mlog_errno(ret);
5469 goto out_commit;
5470 }
5471
5472 ret = ocfs2_remove_extent(handle, &et, cpos, len, meta_ac,
5473 &dealloc);
5474 if (ret) {
5475 mlog_errno(ret);
5476 goto out_commit;
5477 }
5478
5479 le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
5480
5481 ret = ocfs2_journal_dirty(handle, root_bh);
5482 if (ret) {
5483 mlog_errno(ret);
5484 goto out_commit;
5485 }
5486
5487 ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
5488 if (ret)
5489 mlog_errno(ret);
5490
5491 out_commit:
5492 ocfs2_commit_trans(osb, handle);
5493 out:
5494 ocfs2_schedule_truncate_log_flush(osb, 1);
5495
5496 mutex_unlock(&tl_inode->i_mutex);
5497
5498 if (meta_ac)
5499 ocfs2_free_alloc_context(meta_ac);
5500
5501 ocfs2_run_deallocs(osb, &dealloc);
5502
5503 return ret;
5504 }
5505
5506 /*
5507 * check whether the xattr bucket is filled up with the same hash value.
5508 * If we want to insert the xattr with the same hash, return -ENOSPC.
5509 * If we want to insert a xattr with different hash value, go ahead
5510 * and ocfs2_divide_xattr_bucket will handle this.
5511 */
5512 static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
5513 struct ocfs2_xattr_bucket *bucket,
5514 const char *name)
5515 {
5516 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5517 u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
5518
5519 if (name_hash != le32_to_cpu(xh->xh_entries[0].xe_name_hash))
5520 return 0;
5521
5522 if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
5523 xh->xh_entries[0].xe_name_hash) {
5524 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
5525 "hash = %u\n",
5526 (unsigned long long)bucket_blkno(bucket),
5527 le32_to_cpu(xh->xh_entries[0].xe_name_hash));
5528 return -ENOSPC;
5529 }
5530
5531 return 0;
5532 }
5533
5534 /*
5535 * Try to set the entry in the current bucket. If we fail, the caller
5536 * will handle getting us another bucket.
5537 */
5538 static int ocfs2_xattr_set_entry_bucket(struct inode *inode,
5539 struct ocfs2_xattr_info *xi,
5540 struct ocfs2_xattr_search *xs,
5541 struct ocfs2_xattr_set_ctxt *ctxt)
5542 {
5543 int ret;
5544 struct ocfs2_xa_loc loc;
5545
5546 mlog_entry("Set xattr %s in xattr bucket\n", xi->xi_name);
5547
5548 ocfs2_init_xattr_bucket_xa_loc(&loc, xs->bucket,
5549 xs->not_found ? NULL : xs->here);
5550 ret = ocfs2_xa_set(&loc, xi, ctxt);
5551 if (!ret) {
5552 xs->here = loc.xl_entry;
5553 goto out;
5554 }
5555 if (ret != -ENOSPC) {
5556 mlog_errno(ret);
5557 goto out;
5558 }
5559
5560 /* Ok, we need space. Let's try defragmenting the bucket. */
5561 ret = ocfs2_defrag_xattr_bucket(inode, ctxt->handle,
5562 xs->bucket);
5563 if (ret) {
5564 mlog_errno(ret);
5565 goto out;
5566 }
5567
5568 ret = ocfs2_xa_set(&loc, xi, ctxt);
5569 if (!ret) {
5570 xs->here = loc.xl_entry;
5571 goto out;
5572 }
5573 if (ret != -ENOSPC)
5574 mlog_errno(ret);
5575
5576
5577 out:
5578 mlog_exit(ret);
5579 return ret;
5580 }
5581
5582 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
5583 struct ocfs2_xattr_info *xi,
5584 struct ocfs2_xattr_search *xs,
5585 struct ocfs2_xattr_set_ctxt *ctxt)
5586 {
5587 int ret;
5588
5589 mlog_entry("Set xattr %s in xattr index block\n", xi->xi_name);
5590
5591 ret = ocfs2_xattr_set_entry_bucket(inode, xi, xs, ctxt);
5592 if (!ret)
5593 goto out;
5594 if (ret != -ENOSPC) {
5595 mlog_errno(ret);
5596 goto out;
5597 }
5598
5599 /* Ack, need more space. Let's try to get another bucket! */
5600
5601 /*
5602 * We do not allow for overlapping ranges between buckets. And
5603 * the maximum number of collisions we will allow for then is
5604 * one bucket's worth, so check it here whether we need to
5605 * add a new bucket for the insert.
5606 */
5607 ret = ocfs2_check_xattr_bucket_collision(inode,
5608 xs->bucket,
5609 xi->xi_name);
5610 if (ret) {
5611 mlog_errno(ret);
5612 goto out;
5613 }
5614
5615 ret = ocfs2_add_new_xattr_bucket(inode,
5616 xs->xattr_bh,
5617 xs->bucket,
5618 ctxt);
5619 if (ret) {
5620 mlog_errno(ret);
5621 goto out;
5622 }
5623
5624 /*
5625 * ocfs2_add_new_xattr_bucket() will have updated
5626 * xs->bucket if it moved, but it will not have updated
5627 * any of the other search fields. Thus, we drop it and
5628 * re-search. Everything should be cached, so it'll be
5629 * quick.
5630 */
5631 ocfs2_xattr_bucket_relse(xs->bucket);
5632 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
5633 xi->xi_name_index,
5634 xi->xi_name, xs);
5635 if (ret && ret != -ENODATA)
5636 goto out;
5637 xs->not_found = ret;
5638
5639 /* Ok, we have a new bucket, let's try again */
5640 ret = ocfs2_xattr_set_entry_bucket(inode, xi, xs, ctxt);
5641 if (ret && (ret != -ENOSPC))
5642 mlog_errno(ret);
5643
5644 out:
5645 mlog_exit(ret);
5646 return ret;
5647 }
5648
5649 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
5650 struct ocfs2_xattr_bucket *bucket,
5651 void *para)
5652 {
5653 int ret = 0, ref_credits;
5654 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5655 u16 i;
5656 struct ocfs2_xattr_entry *xe;
5657 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5658 struct ocfs2_xattr_set_ctxt ctxt = {NULL, NULL,};
5659 int credits = ocfs2_remove_extent_credits(osb->sb) +
5660 ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5661 struct ocfs2_xattr_value_root *xv;
5662 struct ocfs2_rm_xattr_bucket_para *args =
5663 (struct ocfs2_rm_xattr_bucket_para *)para;
5664
5665 ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
5666
5667 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
5668 xe = &xh->xh_entries[i];
5669 if (ocfs2_xattr_is_local(xe))
5670 continue;
5671
5672 ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket,
5673 i, &xv, NULL);
5674
5675 ret = ocfs2_lock_xattr_remove_allocators(inode, xv,
5676 args->ref_ci,
5677 args->ref_root_bh,
5678 &ctxt.meta_ac,
5679 &ref_credits);
5680
5681 ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
5682 if (IS_ERR(ctxt.handle)) {
5683 ret = PTR_ERR(ctxt.handle);
5684 mlog_errno(ret);
5685 break;
5686 }
5687
5688 ret = ocfs2_xattr_bucket_value_truncate(inode, bucket,
5689 i, 0, &ctxt);
5690
5691 ocfs2_commit_trans(osb, ctxt.handle);
5692 if (ctxt.meta_ac) {
5693 ocfs2_free_alloc_context(ctxt.meta_ac);
5694 ctxt.meta_ac = NULL;
5695 }
5696 if (ret) {
5697 mlog_errno(ret);
5698 break;
5699 }
5700 }
5701
5702 if (ctxt.meta_ac)
5703 ocfs2_free_alloc_context(ctxt.meta_ac);
5704 ocfs2_schedule_truncate_log_flush(osb, 1);
5705 ocfs2_run_deallocs(osb, &ctxt.dealloc);
5706 return ret;
5707 }
5708
5709 /*
5710 * Whenever we modify a xattr value root in the bucket(e.g, CoW
5711 * or change the extent record flag), we need to recalculate
5712 * the metaecc for the whole bucket. So it is done here.
5713 *
5714 * Note:
5715 * We have to give the extra credits for the caller.
5716 */
5717 static int ocfs2_xattr_bucket_post_refcount(struct inode *inode,
5718 handle_t *handle,
5719 void *para)
5720 {
5721 int ret;
5722 struct ocfs2_xattr_bucket *bucket =
5723 (struct ocfs2_xattr_bucket *)para;
5724
5725 ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
5726 OCFS2_JOURNAL_ACCESS_WRITE);
5727 if (ret) {
5728 mlog_errno(ret);
5729 return ret;
5730 }
5731
5732 ocfs2_xattr_bucket_journal_dirty(handle, bucket);
5733
5734 return 0;
5735 }
5736
5737 /*
5738 * Special action we need if the xattr value is refcounted.
5739 *
5740 * 1. If the xattr is refcounted, lock the tree.
5741 * 2. CoW the xattr if we are setting the new value and the value
5742 * will be stored outside.
5743 * 3. In other case, decrease_refcount will work for us, so just
5744 * lock the refcount tree, calculate the meta and credits is OK.
5745 *
5746 * We have to do CoW before ocfs2_init_xattr_set_ctxt since
5747 * currently CoW is a completed transaction, while this function
5748 * will also lock the allocators and let us deadlock. So we will
5749 * CoW the whole xattr value.
5750 */
5751 static int ocfs2_prepare_refcount_xattr(struct inode *inode,
5752 struct ocfs2_dinode *di,
5753 struct ocfs2_xattr_info *xi,
5754 struct ocfs2_xattr_search *xis,
5755 struct ocfs2_xattr_search *xbs,
5756 struct ocfs2_refcount_tree **ref_tree,
5757 int *meta_add,
5758 int *credits)
5759 {
5760 int ret = 0;
5761 struct ocfs2_xattr_block *xb;
5762 struct ocfs2_xattr_entry *xe;
5763 char *base;
5764 u32 p_cluster, num_clusters;
5765 unsigned int ext_flags;
5766 int name_offset, name_len;
5767 struct ocfs2_xattr_value_buf vb;
5768 struct ocfs2_xattr_bucket *bucket = NULL;
5769 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5770 struct ocfs2_post_refcount refcount;
5771 struct ocfs2_post_refcount *p = NULL;
5772 struct buffer_head *ref_root_bh = NULL;
5773
5774 if (!xis->not_found) {
5775 xe = xis->here;
5776 name_offset = le16_to_cpu(xe->xe_name_offset);
5777 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5778 base = xis->base;
5779 vb.vb_bh = xis->inode_bh;
5780 vb.vb_access = ocfs2_journal_access_di;
5781 } else {
5782 int i, block_off = 0;
5783 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
5784 xe = xbs->here;
5785 name_offset = le16_to_cpu(xe->xe_name_offset);
5786 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5787 i = xbs->here - xbs->header->xh_entries;
5788
5789 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
5790 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
5791 bucket_xh(xbs->bucket),
5792 i, &block_off,
5793 &name_offset);
5794 if (ret) {
5795 mlog_errno(ret);
5796 goto out;
5797 }
5798 base = bucket_block(xbs->bucket, block_off);
5799 vb.vb_bh = xbs->bucket->bu_bhs[block_off];
5800 vb.vb_access = ocfs2_journal_access;
5801
5802 if (ocfs2_meta_ecc(osb)) {
5803 /*create parameters for ocfs2_post_refcount. */
5804 bucket = xbs->bucket;
5805 refcount.credits = bucket->bu_blocks;
5806 refcount.para = bucket;
5807 refcount.func =
5808 ocfs2_xattr_bucket_post_refcount;
5809 p = &refcount;
5810 }
5811 } else {
5812 base = xbs->base;
5813 vb.vb_bh = xbs->xattr_bh;
5814 vb.vb_access = ocfs2_journal_access_xb;
5815 }
5816 }
5817
5818 if (ocfs2_xattr_is_local(xe))
5819 goto out;
5820
5821 vb.vb_xv = (struct ocfs2_xattr_value_root *)
5822 (base + name_offset + name_len);
5823
5824 ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
5825 &num_clusters, &vb.vb_xv->xr_list,
5826 &ext_flags);
5827 if (ret) {
5828 mlog_errno(ret);
5829 goto out;
5830 }
5831
5832 /*
5833 * We just need to check the 1st extent record, since we always
5834 * CoW the whole xattr. So there shouldn't be a xattr with
5835 * some REFCOUNT extent recs after the 1st one.
5836 */
5837 if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
5838 goto out;
5839
5840 ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
5841 1, ref_tree, &ref_root_bh);
5842 if (ret) {
5843 mlog_errno(ret);
5844 goto out;
5845 }
5846
5847 /*
5848 * If we are deleting the xattr or the new size will be stored inside,
5849 * cool, leave it there, the xattr truncate process will remove them
5850 * for us(it still needs the refcount tree lock and the meta, credits).
5851 * And the worse case is that every cluster truncate will split the
5852 * refcount tree, and make the original extent become 3. So we will need
5853 * 2 * cluster more extent recs at most.
5854 */
5855 if (!xi->xi_value || xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE) {
5856
5857 ret = ocfs2_refcounted_xattr_delete_need(inode,
5858 &(*ref_tree)->rf_ci,
5859 ref_root_bh, vb.vb_xv,
5860 meta_add, credits);
5861 if (ret)
5862 mlog_errno(ret);
5863 goto out;
5864 }
5865
5866 ret = ocfs2_refcount_cow_xattr(inode, di, &vb,
5867 *ref_tree, ref_root_bh, 0,
5868 le32_to_cpu(vb.vb_xv->xr_clusters), p);
5869 if (ret)
5870 mlog_errno(ret);
5871
5872 out:
5873 brelse(ref_root_bh);
5874 return ret;
5875 }
5876
5877 /*
5878 * Add the REFCOUNTED flags for all the extent rec in ocfs2_xattr_value_root.
5879 * The physical clusters will be added to refcount tree.
5880 */
5881 static int ocfs2_xattr_value_attach_refcount(struct inode *inode,
5882 struct ocfs2_xattr_value_root *xv,
5883 struct ocfs2_extent_tree *value_et,
5884 struct ocfs2_caching_info *ref_ci,
5885 struct buffer_head *ref_root_bh,
5886 struct ocfs2_cached_dealloc_ctxt *dealloc,
5887 struct ocfs2_post_refcount *refcount)
5888 {
5889 int ret = 0;
5890 u32 clusters = le32_to_cpu(xv->xr_clusters);
5891 u32 cpos, p_cluster, num_clusters;
5892 struct ocfs2_extent_list *el = &xv->xr_list;
5893 unsigned int ext_flags;
5894
5895 cpos = 0;
5896 while (cpos < clusters) {
5897 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
5898 &num_clusters, el, &ext_flags);
5899
5900 cpos += num_clusters;
5901 if ((ext_flags & OCFS2_EXT_REFCOUNTED))
5902 continue;
5903
5904 BUG_ON(!p_cluster);
5905
5906 ret = ocfs2_add_refcount_flag(inode, value_et,
5907 ref_ci, ref_root_bh,
5908 cpos - num_clusters,
5909 p_cluster, num_clusters,
5910 dealloc, refcount);
5911 if (ret) {
5912 mlog_errno(ret);
5913 break;
5914 }
5915 }
5916
5917 return ret;
5918 }
5919
5920 /*
5921 * Given a normal ocfs2_xattr_header, refcount all the entries which
5922 * have value stored outside.
5923 * Used for xattrs stored in inode and ocfs2_xattr_block.
5924 */
5925 static int ocfs2_xattr_attach_refcount_normal(struct inode *inode,
5926 struct ocfs2_xattr_value_buf *vb,
5927 struct ocfs2_xattr_header *header,
5928 struct ocfs2_caching_info *ref_ci,
5929 struct buffer_head *ref_root_bh,
5930 struct ocfs2_cached_dealloc_ctxt *dealloc)
5931 {
5932
5933 struct ocfs2_xattr_entry *xe;
5934 struct ocfs2_xattr_value_root *xv;
5935 struct ocfs2_extent_tree et;
5936 int i, ret = 0;
5937
5938 for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
5939 xe = &header->xh_entries[i];
5940
5941 if (ocfs2_xattr_is_local(xe))
5942 continue;
5943
5944 xv = (struct ocfs2_xattr_value_root *)((void *)header +
5945 le16_to_cpu(xe->xe_name_offset) +
5946 OCFS2_XATTR_SIZE(xe->xe_name_len));
5947
5948 vb->vb_xv = xv;
5949 ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
5950
5951 ret = ocfs2_xattr_value_attach_refcount(inode, xv, &et,
5952 ref_ci, ref_root_bh,
5953 dealloc, NULL);
5954 if (ret) {
5955 mlog_errno(ret);
5956 break;
5957 }
5958 }
5959
5960 return ret;
5961 }
5962
5963 static int ocfs2_xattr_inline_attach_refcount(struct inode *inode,
5964 struct buffer_head *fe_bh,
5965 struct ocfs2_caching_info *ref_ci,
5966 struct buffer_head *ref_root_bh,
5967 struct ocfs2_cached_dealloc_ctxt *dealloc)
5968 {
5969 struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
5970 struct ocfs2_xattr_header *header = (struct ocfs2_xattr_header *)
5971 (fe_bh->b_data + inode->i_sb->s_blocksize -
5972 le16_to_cpu(di->i_xattr_inline_size));
5973 struct ocfs2_xattr_value_buf vb = {
5974 .vb_bh = fe_bh,
5975 .vb_access = ocfs2_journal_access_di,
5976 };
5977
5978 return ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
5979 ref_ci, ref_root_bh, dealloc);
5980 }
5981
5982 struct ocfs2_xattr_tree_value_refcount_para {
5983 struct ocfs2_caching_info *ref_ci;
5984 struct buffer_head *ref_root_bh;
5985 struct ocfs2_cached_dealloc_ctxt *dealloc;
5986 };
5987
5988 static int ocfs2_get_xattr_tree_value_root(struct super_block *sb,
5989 struct ocfs2_xattr_bucket *bucket,
5990 int offset,
5991 struct ocfs2_xattr_value_root **xv,
5992 struct buffer_head **bh)
5993 {
5994 int ret, block_off, name_offset;
5995 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5996 struct ocfs2_xattr_entry *xe = &xh->xh_entries[offset];
5997 void *base;
5998
5999 ret = ocfs2_xattr_bucket_get_name_value(sb,
6000 bucket_xh(bucket),
6001 offset,
6002 &block_off,
6003 &name_offset);
6004 if (ret) {
6005 mlog_errno(ret);
6006 goto out;
6007 }
6008
6009 base = bucket_block(bucket, block_off);
6010
6011 *xv = (struct ocfs2_xattr_value_root *)(base + name_offset +
6012 OCFS2_XATTR_SIZE(xe->xe_name_len));
6013
6014 if (bh)
6015 *bh = bucket->bu_bhs[block_off];
6016 out:
6017 return ret;
6018 }
6019
6020 /*
6021 * For a given xattr bucket, refcount all the entries which
6022 * have value stored outside.
6023 */
6024 static int ocfs2_xattr_bucket_value_refcount(struct inode *inode,
6025 struct ocfs2_xattr_bucket *bucket,
6026 void *para)
6027 {
6028 int i, ret = 0;
6029 struct ocfs2_extent_tree et;
6030 struct ocfs2_xattr_tree_value_refcount_para *ref =
6031 (struct ocfs2_xattr_tree_value_refcount_para *)para;
6032 struct ocfs2_xattr_header *xh =
6033 (struct ocfs2_xattr_header *)bucket->bu_bhs[0]->b_data;
6034 struct ocfs2_xattr_entry *xe;
6035 struct ocfs2_xattr_value_buf vb = {
6036 .vb_access = ocfs2_journal_access,
6037 };
6038 struct ocfs2_post_refcount refcount = {
6039 .credits = bucket->bu_blocks,
6040 .para = bucket,
6041 .func = ocfs2_xattr_bucket_post_refcount,
6042 };
6043 struct ocfs2_post_refcount *p = NULL;
6044
6045 /* We only need post_refcount if we support metaecc. */
6046 if (ocfs2_meta_ecc(OCFS2_SB(inode->i_sb)))
6047 p = &refcount;
6048
6049 mlog(0, "refcount bucket %llu, count = %u\n",
6050 (unsigned long long)bucket_blkno(bucket),
6051 le16_to_cpu(xh->xh_count));
6052 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
6053 xe = &xh->xh_entries[i];
6054
6055 if (ocfs2_xattr_is_local(xe))
6056 continue;
6057
6058 ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket, i,
6059 &vb.vb_xv, &vb.vb_bh);
6060 if (ret) {
6061 mlog_errno(ret);
6062 break;
6063 }
6064
6065 ocfs2_init_xattr_value_extent_tree(&et,
6066 INODE_CACHE(inode), &vb);
6067
6068 ret = ocfs2_xattr_value_attach_refcount(inode, vb.vb_xv,
6069 &et, ref->ref_ci,
6070 ref->ref_root_bh,
6071 ref->dealloc, p);
6072 if (ret) {
6073 mlog_errno(ret);
6074 break;
6075 }
6076 }
6077
6078 return ret;
6079
6080 }
6081
6082 static int ocfs2_refcount_xattr_tree_rec(struct inode *inode,
6083 struct buffer_head *root_bh,
6084 u64 blkno, u32 cpos, u32 len, void *para)
6085 {
6086 return ocfs2_iterate_xattr_buckets(inode, blkno, len,
6087 ocfs2_xattr_bucket_value_refcount,
6088 para);
6089 }
6090
6091 static int ocfs2_xattr_block_attach_refcount(struct inode *inode,
6092 struct buffer_head *blk_bh,
6093 struct ocfs2_caching_info *ref_ci,
6094 struct buffer_head *ref_root_bh,
6095 struct ocfs2_cached_dealloc_ctxt *dealloc)
6096 {
6097 int ret = 0;
6098 struct ocfs2_xattr_block *xb =
6099 (struct ocfs2_xattr_block *)blk_bh->b_data;
6100
6101 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
6102 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
6103 struct ocfs2_xattr_value_buf vb = {
6104 .vb_bh = blk_bh,
6105 .vb_access = ocfs2_journal_access_xb,
6106 };
6107
6108 ret = ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
6109 ref_ci, ref_root_bh,
6110 dealloc);
6111 } else {
6112 struct ocfs2_xattr_tree_value_refcount_para para = {
6113 .ref_ci = ref_ci,
6114 .ref_root_bh = ref_root_bh,
6115 .dealloc = dealloc,
6116 };
6117
6118 ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
6119 ocfs2_refcount_xattr_tree_rec,
6120 &para);
6121 }
6122
6123 return ret;
6124 }
6125
6126 int ocfs2_xattr_attach_refcount_tree(struct inode *inode,
6127 struct buffer_head *fe_bh,
6128 struct ocfs2_caching_info *ref_ci,
6129 struct buffer_head *ref_root_bh,
6130 struct ocfs2_cached_dealloc_ctxt *dealloc)
6131 {
6132 int ret = 0;
6133 struct ocfs2_inode_info *oi = OCFS2_I(inode);
6134 struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
6135 struct buffer_head *blk_bh = NULL;
6136
6137 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
6138 ret = ocfs2_xattr_inline_attach_refcount(inode, fe_bh,
6139 ref_ci, ref_root_bh,
6140 dealloc);
6141 if (ret) {
6142 mlog_errno(ret);
6143 goto out;
6144 }
6145 }
6146
6147 if (!di->i_xattr_loc)
6148 goto out;
6149
6150 ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
6151 &blk_bh);
6152 if (ret < 0) {
6153 mlog_errno(ret);
6154 goto out;
6155 }
6156
6157 ret = ocfs2_xattr_block_attach_refcount(inode, blk_bh, ref_ci,
6158 ref_root_bh, dealloc);
6159 if (ret)
6160 mlog_errno(ret);
6161
6162 brelse(blk_bh);
6163 out:
6164
6165 return ret;
6166 }
6167
6168 typedef int (should_xattr_reflinked)(struct ocfs2_xattr_entry *xe);
6169 /*
6170 * Store the information we need in xattr reflink.
6171 * old_bh and new_bh are inode bh for the old and new inode.
6172 */
6173 struct ocfs2_xattr_reflink {
6174 struct inode *old_inode;
6175 struct inode *new_inode;
6176 struct buffer_head *old_bh;
6177 struct buffer_head *new_bh;
6178 struct ocfs2_caching_info *ref_ci;
6179 struct buffer_head *ref_root_bh;
6180 struct ocfs2_cached_dealloc_ctxt *dealloc;
6181 should_xattr_reflinked *xattr_reflinked;
6182 };
6183
6184 /*
6185 * Given a xattr header and xe offset,
6186 * return the proper xv and the corresponding bh.
6187 * xattr in inode, block and xattr tree have different implementaions.
6188 */
6189 typedef int (get_xattr_value_root)(struct super_block *sb,
6190 struct buffer_head *bh,
6191 struct ocfs2_xattr_header *xh,
6192 int offset,
6193 struct ocfs2_xattr_value_root **xv,
6194 struct buffer_head **ret_bh,
6195 void *para);
6196
6197 /*
6198 * Calculate all the xattr value root metadata stored in this xattr header and
6199 * credits we need if we create them from the scratch.
6200 * We use get_xattr_value_root so that all types of xattr container can use it.
6201 */
6202 static int ocfs2_value_metas_in_xattr_header(struct super_block *sb,
6203 struct buffer_head *bh,
6204 struct ocfs2_xattr_header *xh,
6205 int *metas, int *credits,
6206 int *num_recs,
6207 get_xattr_value_root *func,
6208 void *para)
6209 {
6210 int i, ret = 0;
6211 struct ocfs2_xattr_value_root *xv;
6212 struct ocfs2_xattr_entry *xe;
6213
6214 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
6215 xe = &xh->xh_entries[i];
6216 if (ocfs2_xattr_is_local(xe))
6217 continue;
6218
6219 ret = func(sb, bh, xh, i, &xv, NULL, para);
6220 if (ret) {
6221 mlog_errno(ret);
6222 break;
6223 }
6224
6225 *metas += le16_to_cpu(xv->xr_list.l_tree_depth) *
6226 le16_to_cpu(xv->xr_list.l_next_free_rec);
6227
6228 *credits += ocfs2_calc_extend_credits(sb,
6229 &def_xv.xv.xr_list,
6230 le32_to_cpu(xv->xr_clusters));
6231
6232 /*
6233 * If the value is a tree with depth > 1, We don't go deep
6234 * to the extent block, so just calculate a maximum record num.
6235 */
6236 if (!xv->xr_list.l_tree_depth)
6237 *num_recs += le16_to_cpu(xv->xr_list.l_next_free_rec);
6238 else
6239 *num_recs += ocfs2_clusters_for_bytes(sb,
6240 XATTR_SIZE_MAX);
6241 }
6242
6243 return ret;
6244 }
6245
6246 /* Used by xattr inode and block to return the right xv and buffer_head. */
6247 static int ocfs2_get_xattr_value_root(struct super_block *sb,
6248 struct buffer_head *bh,
6249 struct ocfs2_xattr_header *xh,
6250 int offset,
6251 struct ocfs2_xattr_value_root **xv,
6252 struct buffer_head **ret_bh,
6253 void *para)
6254 {
6255 struct ocfs2_xattr_entry *xe = &xh->xh_entries[offset];
6256
6257 *xv = (struct ocfs2_xattr_value_root *)((void *)xh +
6258 le16_to_cpu(xe->xe_name_offset) +
6259 OCFS2_XATTR_SIZE(xe->xe_name_len));
6260
6261 if (ret_bh)
6262 *ret_bh = bh;
6263
6264 return 0;
6265 }
6266
6267 /*
6268 * Lock the meta_ac and caculate how much credits we need for reflink xattrs.
6269 * It is only used for inline xattr and xattr block.
6270 */
6271 static int ocfs2_reflink_lock_xattr_allocators(struct ocfs2_super *osb,
6272 struct ocfs2_xattr_header *xh,
6273 struct buffer_head *ref_root_bh,
6274 int *credits,
6275 struct ocfs2_alloc_context **meta_ac)
6276 {
6277 int ret, meta_add = 0, num_recs = 0;
6278 struct ocfs2_refcount_block *rb =
6279 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
6280
6281 *credits = 0;
6282
6283 ret = ocfs2_value_metas_in_xattr_header(osb->sb, NULL, xh,
6284 &meta_add, credits, &num_recs,
6285 ocfs2_get_xattr_value_root,
6286 NULL);
6287 if (ret) {
6288 mlog_errno(ret);
6289 goto out;
6290 }
6291
6292 /*
6293 * We need to add/modify num_recs in refcount tree, so just calculate
6294 * an approximate number we need for refcount tree change.
6295 * Sometimes we need to split the tree, and after split, half recs
6296 * will be moved to the new block, and a new block can only provide
6297 * half number of recs. So we multiple new blocks by 2.
6298 */
6299 num_recs = num_recs / ocfs2_refcount_recs_per_rb(osb->sb) * 2;
6300 meta_add += num_recs;
6301 *credits += num_recs + num_recs * OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
6302 if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
6303 *credits += le16_to_cpu(rb->rf_list.l_tree_depth) *
6304 le16_to_cpu(rb->rf_list.l_next_free_rec) + 1;
6305 else
6306 *credits += 1;
6307
6308 ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add, meta_ac);
6309 if (ret)
6310 mlog_errno(ret);
6311
6312 out:
6313 return ret;
6314 }
6315
6316 /*
6317 * Given a xattr header, reflink all the xattrs in this container.
6318 * It can be used for inode, block and bucket.
6319 *
6320 * NOTE:
6321 * Before we call this function, the caller has memcpy the xattr in
6322 * old_xh to the new_xh.
6323 *
6324 * If args.xattr_reflinked is set, call it to decide whether the xe should
6325 * be reflinked or not. If not, remove it from the new xattr header.
6326 */
6327 static int ocfs2_reflink_xattr_header(handle_t *handle,
6328 struct ocfs2_xattr_reflink *args,
6329 struct buffer_head *old_bh,
6330 struct ocfs2_xattr_header *xh,
6331 struct buffer_head *new_bh,
6332 struct ocfs2_xattr_header *new_xh,
6333 struct ocfs2_xattr_value_buf *vb,
6334 struct ocfs2_alloc_context *meta_ac,
6335 get_xattr_value_root *func,
6336 void *para)
6337 {
6338 int ret = 0, i, j;
6339 struct super_block *sb = args->old_inode->i_sb;
6340 struct buffer_head *value_bh;
6341 struct ocfs2_xattr_entry *xe, *last;
6342 struct ocfs2_xattr_value_root *xv, *new_xv;
6343 struct ocfs2_extent_tree data_et;
6344 u32 clusters, cpos, p_cluster, num_clusters;
6345 unsigned int ext_flags = 0;
6346
6347 mlog(0, "reflink xattr in container %llu, count = %u\n",
6348 (unsigned long long)old_bh->b_blocknr, le16_to_cpu(xh->xh_count));
6349
6350 last = &new_xh->xh_entries[le16_to_cpu(new_xh->xh_count)];
6351 for (i = 0, j = 0; i < le16_to_cpu(xh->xh_count); i++, j++) {
6352 xe = &xh->xh_entries[i];
6353
6354 if (args->xattr_reflinked && !args->xattr_reflinked(xe)) {
6355 xe = &new_xh->xh_entries[j];
6356
6357 le16_add_cpu(&new_xh->xh_count, -1);
6358 if (new_xh->xh_count) {
6359 memmove(xe, xe + 1,
6360 (void *)last - (void *)xe);
6361 memset(last, 0,
6362 sizeof(struct ocfs2_xattr_entry));
6363 }
6364
6365 /*
6366 * We don't want j to increase in the next round since
6367 * it is already moved ahead.
6368 */
6369 j--;
6370 continue;
6371 }
6372
6373 if (ocfs2_xattr_is_local(xe))
6374 continue;
6375
6376 ret = func(sb, old_bh, xh, i, &xv, NULL, para);
6377 if (ret) {
6378 mlog_errno(ret);
6379 break;
6380 }
6381
6382 ret = func(sb, new_bh, new_xh, j, &new_xv, &value_bh, para);
6383 if (ret) {
6384 mlog_errno(ret);
6385 break;
6386 }
6387
6388 /*
6389 * For the xattr which has l_tree_depth = 0, all the extent
6390 * recs have already be copied to the new xh with the
6391 * propriate OCFS2_EXT_REFCOUNTED flag we just need to
6392 * increase the refount count int the refcount tree.
6393 *
6394 * For the xattr which has l_tree_depth > 0, we need
6395 * to initialize it to the empty default value root,
6396 * and then insert the extents one by one.
6397 */
6398 if (xv->xr_list.l_tree_depth) {
6399 memcpy(new_xv, &def_xv, sizeof(def_xv));
6400 vb->vb_xv = new_xv;
6401 vb->vb_bh = value_bh;
6402 ocfs2_init_xattr_value_extent_tree(&data_et,
6403 INODE_CACHE(args->new_inode), vb);
6404 }
6405
6406 clusters = le32_to_cpu(xv->xr_clusters);
6407 cpos = 0;
6408 while (cpos < clusters) {
6409 ret = ocfs2_xattr_get_clusters(args->old_inode,
6410 cpos,
6411 &p_cluster,
6412 &num_clusters,
6413 &xv->xr_list,
6414 &ext_flags);
6415 if (ret) {
6416 mlog_errno(ret);
6417 goto out;
6418 }
6419
6420 BUG_ON(!p_cluster);
6421
6422 if (xv->xr_list.l_tree_depth) {
6423 ret = ocfs2_insert_extent(handle,
6424 &data_et, cpos,
6425 ocfs2_clusters_to_blocks(
6426 args->old_inode->i_sb,
6427 p_cluster),
6428 num_clusters, ext_flags,
6429 meta_ac);
6430 if (ret) {
6431 mlog_errno(ret);
6432 goto out;
6433 }
6434 }
6435
6436 ret = ocfs2_increase_refcount(handle, args->ref_ci,
6437 args->ref_root_bh,
6438 p_cluster, num_clusters,
6439 meta_ac, args->dealloc);
6440 if (ret) {
6441 mlog_errno(ret);
6442 goto out;
6443 }
6444
6445 cpos += num_clusters;
6446 }
6447 }
6448
6449 out:
6450 return ret;
6451 }
6452
6453 static int ocfs2_reflink_xattr_inline(struct ocfs2_xattr_reflink *args)
6454 {
6455 int ret = 0, credits = 0;
6456 handle_t *handle;
6457 struct ocfs2_super *osb = OCFS2_SB(args->old_inode->i_sb);
6458 struct ocfs2_dinode *di = (struct ocfs2_dinode *)args->old_bh->b_data;
6459 int inline_size = le16_to_cpu(di->i_xattr_inline_size);
6460 int header_off = osb->sb->s_blocksize - inline_size;
6461 struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)
6462 (args->old_bh->b_data + header_off);
6463 struct ocfs2_xattr_header *new_xh = (struct ocfs2_xattr_header *)
6464 (args->new_bh->b_data + header_off);
6465 struct ocfs2_alloc_context *meta_ac = NULL;
6466 struct ocfs2_inode_info *new_oi;
6467 struct ocfs2_dinode *new_di;
6468 struct ocfs2_xattr_value_buf vb = {
6469 .vb_bh = args->new_bh,
6470 .vb_access = ocfs2_journal_access_di,
6471 };
6472
6473 ret = ocfs2_reflink_lock_xattr_allocators(osb, xh, args->ref_root_bh,
6474 &credits, &meta_ac);
6475 if (ret) {
6476 mlog_errno(ret);
6477 goto out;
6478 }
6479
6480 handle = ocfs2_start_trans(osb, credits);
6481 if (IS_ERR(handle)) {
6482 ret = PTR_ERR(handle);
6483 mlog_errno(ret);
6484 goto out;
6485 }
6486
6487 ret = ocfs2_journal_access_di(handle, INODE_CACHE(args->new_inode),
6488 args->new_bh, OCFS2_JOURNAL_ACCESS_WRITE);
6489 if (ret) {
6490 mlog_errno(ret);
6491 goto out_commit;
6492 }
6493
6494 memcpy(args->new_bh->b_data + header_off,
6495 args->old_bh->b_data + header_off, inline_size);
6496
6497 new_di = (struct ocfs2_dinode *)args->new_bh->b_data;
6498 new_di->i_xattr_inline_size = cpu_to_le16(inline_size);
6499
6500 ret = ocfs2_reflink_xattr_header(handle, args, args->old_bh, xh,
6501 args->new_bh, new_xh, &vb, meta_ac,
6502 ocfs2_get_xattr_value_root, NULL);
6503 if (ret) {
6504 mlog_errno(ret);
6505 goto out_commit;
6506 }
6507
6508 new_oi = OCFS2_I(args->new_inode);
6509 spin_lock(&new_oi->ip_lock);
6510 new_oi->ip_dyn_features |= OCFS2_HAS_XATTR_FL | OCFS2_INLINE_XATTR_FL;
6511 new_di->i_dyn_features = cpu_to_le16(new_oi->ip_dyn_features);
6512 spin_unlock(&new_oi->ip_lock);
6513
6514 ocfs2_journal_dirty(handle, args->new_bh);
6515
6516 out_commit:
6517 ocfs2_commit_trans(osb, handle);
6518
6519 out:
6520 if (meta_ac)
6521 ocfs2_free_alloc_context(meta_ac);
6522 return ret;
6523 }
6524
6525 static int ocfs2_create_empty_xattr_block(struct inode *inode,
6526 struct buffer_head *fe_bh,
6527 struct buffer_head **ret_bh,
6528 int indexed)
6529 {
6530 int ret;
6531 struct ocfs2_alloc_context *meta_ac;
6532 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
6533 struct ocfs2_xattr_set_ctxt ctxt = {
6534 .meta_ac = meta_ac,
6535 };
6536
6537 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
6538 if (ret < 0) {
6539 mlog_errno(ret);
6540 return ret;
6541 }
6542
6543 ctxt.handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_CREATE_CREDITS);
6544 if (IS_ERR(ctxt.handle)) {
6545 ret = PTR_ERR(ctxt.handle);
6546 mlog_errno(ret);
6547 goto out;
6548 }
6549
6550 mlog(0, "create new xattr block for inode %llu, index = %d\n",
6551 (unsigned long long)fe_bh->b_blocknr, indexed);
6552 ret = ocfs2_create_xattr_block(inode, fe_bh, &ctxt, indexed,
6553 ret_bh);
6554 if (ret)
6555 mlog_errno(ret);
6556
6557 ocfs2_commit_trans(osb, ctxt.handle);
6558 out:
6559 ocfs2_free_alloc_context(meta_ac);
6560 return ret;
6561 }
6562
6563 static int ocfs2_reflink_xattr_block(struct ocfs2_xattr_reflink *args,
6564 struct buffer_head *blk_bh,
6565 struct buffer_head *new_blk_bh)
6566 {
6567 int ret = 0, credits = 0;
6568 handle_t *handle;
6569 struct ocfs2_inode_info *new_oi = OCFS2_I(args->new_inode);
6570 struct ocfs2_dinode *new_di;
6571 struct ocfs2_super *osb = OCFS2_SB(args->new_inode->i_sb);
6572 int header_off = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
6573 struct ocfs2_xattr_block *xb =
6574 (struct ocfs2_xattr_block *)blk_bh->b_data;
6575 struct ocfs2_xattr_header *xh = &xb->xb_attrs.xb_header;
6576 struct ocfs2_xattr_block *new_xb =
6577 (struct ocfs2_xattr_block *)new_blk_bh->b_data;
6578 struct ocfs2_xattr_header *new_xh = &new_xb->xb_attrs.xb_header;
6579 struct ocfs2_alloc_context *meta_ac;
6580 struct ocfs2_xattr_value_buf vb = {
6581 .vb_bh = new_blk_bh,
6582 .vb_access = ocfs2_journal_access_xb,
6583 };
6584
6585 ret = ocfs2_reflink_lock_xattr_allocators(osb, xh, args->ref_root_bh,
6586 &credits, &meta_ac);
6587 if (ret) {
6588 mlog_errno(ret);
6589 return ret;
6590 }
6591
6592 /* One more credits in case we need to add xattr flags in new inode. */
6593 handle = ocfs2_start_trans(osb, credits + 1);
6594 if (IS_ERR(handle)) {
6595 ret = PTR_ERR(handle);
6596 mlog_errno(ret);
6597 goto out;
6598 }
6599
6600 if (!(new_oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) {
6601 ret = ocfs2_journal_access_di(handle,
6602 INODE_CACHE(args->new_inode),
6603 args->new_bh,
6604 OCFS2_JOURNAL_ACCESS_WRITE);
6605 if (ret) {
6606 mlog_errno(ret);
6607 goto out_commit;
6608 }
6609 }
6610
6611 ret = ocfs2_journal_access_xb(handle, INODE_CACHE(args->new_inode),
6612 new_blk_bh, OCFS2_JOURNAL_ACCESS_WRITE);
6613 if (ret) {
6614 mlog_errno(ret);
6615 goto out_commit;
6616 }
6617
6618 memcpy(new_blk_bh->b_data + header_off, blk_bh->b_data + header_off,
6619 osb->sb->s_blocksize - header_off);
6620
6621 ret = ocfs2_reflink_xattr_header(handle, args, blk_bh, xh,
6622 new_blk_bh, new_xh, &vb, meta_ac,
6623 ocfs2_get_xattr_value_root, NULL);
6624 if (ret) {
6625 mlog_errno(ret);
6626 goto out_commit;
6627 }
6628
6629 ocfs2_journal_dirty(handle, new_blk_bh);
6630
6631 if (!(new_oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) {
6632 new_di = (struct ocfs2_dinode *)args->new_bh->b_data;
6633 spin_lock(&new_oi->ip_lock);
6634 new_oi->ip_dyn_features |= OCFS2_HAS_XATTR_FL;
6635 new_di->i_dyn_features = cpu_to_le16(new_oi->ip_dyn_features);
6636 spin_unlock(&new_oi->ip_lock);
6637
6638 ocfs2_journal_dirty(handle, args->new_bh);
6639 }
6640
6641 out_commit:
6642 ocfs2_commit_trans(osb, handle);
6643
6644 out:
6645 ocfs2_free_alloc_context(meta_ac);
6646 return ret;
6647 }
6648
6649 struct ocfs2_reflink_xattr_tree_args {
6650 struct ocfs2_xattr_reflink *reflink;
6651 struct buffer_head *old_blk_bh;
6652 struct buffer_head *new_blk_bh;
6653 struct ocfs2_xattr_bucket *old_bucket;
6654 struct ocfs2_xattr_bucket *new_bucket;
6655 };
6656
6657 /*
6658 * NOTE:
6659 * We have to handle the case that both old bucket and new bucket
6660 * will call this function to get the right ret_bh.
6661 * So The caller must give us the right bh.
6662 */
6663 static int ocfs2_get_reflink_xattr_value_root(struct super_block *sb,
6664 struct buffer_head *bh,
6665 struct ocfs2_xattr_header *xh,
6666 int offset,
6667 struct ocfs2_xattr_value_root **xv,
6668 struct buffer_head **ret_bh,
6669 void *para)
6670 {
6671 struct ocfs2_reflink_xattr_tree_args *args =
6672 (struct ocfs2_reflink_xattr_tree_args *)para;
6673 struct ocfs2_xattr_bucket *bucket;
6674
6675 if (bh == args->old_bucket->bu_bhs[0])
6676 bucket = args->old_bucket;
6677 else
6678 bucket = args->new_bucket;
6679
6680 return ocfs2_get_xattr_tree_value_root(sb, bucket, offset,
6681 xv, ret_bh);
6682 }
6683
6684 struct ocfs2_value_tree_metas {
6685 int num_metas;
6686 int credits;
6687 int num_recs;
6688 };
6689
6690 static int ocfs2_value_tree_metas_in_bucket(struct super_block *sb,
6691 struct buffer_head *bh,
6692 struct ocfs2_xattr_header *xh,
6693 int offset,
6694 struct ocfs2_xattr_value_root **xv,
6695 struct buffer_head **ret_bh,
6696 void *para)
6697 {
6698 struct ocfs2_xattr_bucket *bucket =
6699 (struct ocfs2_xattr_bucket *)para;
6700
6701 return ocfs2_get_xattr_tree_value_root(sb, bucket, offset,
6702 xv, ret_bh);
6703 }
6704
6705 static int ocfs2_calc_value_tree_metas(struct inode *inode,
6706 struct ocfs2_xattr_bucket *bucket,
6707 void *para)
6708 {
6709 struct ocfs2_value_tree_metas *metas =
6710 (struct ocfs2_value_tree_metas *)para;
6711 struct ocfs2_xattr_header *xh =
6712 (struct ocfs2_xattr_header *)bucket->bu_bhs[0]->b_data;
6713
6714 /* Add the credits for this bucket first. */
6715 metas->credits += bucket->bu_blocks;
6716 return ocfs2_value_metas_in_xattr_header(inode->i_sb, bucket->bu_bhs[0],
6717 xh, &metas->num_metas,
6718 &metas->credits, &metas->num_recs,
6719 ocfs2_value_tree_metas_in_bucket,
6720 bucket);
6721 }
6722
6723 /*
6724 * Given a xattr extent rec starting from blkno and having len clusters,
6725 * iterate all the buckets calculate how much metadata we need for reflinking
6726 * all the ocfs2_xattr_value_root and lock the allocators accordingly.
6727 */
6728 static int ocfs2_lock_reflink_xattr_rec_allocators(
6729 struct ocfs2_reflink_xattr_tree_args *args,
6730 struct ocfs2_extent_tree *xt_et,
6731 u64 blkno, u32 len, int *credits,
6732 struct ocfs2_alloc_context **meta_ac,
6733 struct ocfs2_alloc_context **data_ac)
6734 {
6735 int ret, num_free_extents;
6736 struct ocfs2_value_tree_metas metas;
6737 struct ocfs2_super *osb = OCFS2_SB(args->reflink->old_inode->i_sb);
6738 struct ocfs2_refcount_block *rb;
6739
6740 memset(&metas, 0, sizeof(metas));
6741
6742 ret = ocfs2_iterate_xattr_buckets(args->reflink->old_inode, blkno, len,
6743 ocfs2_calc_value_tree_metas, &metas);
6744 if (ret) {
6745 mlog_errno(ret);
6746 goto out;
6747 }
6748
6749 *credits = metas.credits;
6750
6751 /*
6752 * Calculate we need for refcount tree change.
6753 *
6754 * We need to add/modify num_recs in refcount tree, so just calculate
6755 * an approximate number we need for refcount tree change.
6756 * Sometimes we need to split the tree, and after split, half recs
6757 * will be moved to the new block, and a new block can only provide
6758 * half number of recs. So we multiple new blocks by 2.
6759 * In the end, we have to add credits for modifying the already
6760 * existed refcount block.
6761 */
6762 rb = (struct ocfs2_refcount_block *)args->reflink->ref_root_bh->b_data;
6763 metas.num_recs =
6764 (metas.num_recs + ocfs2_refcount_recs_per_rb(osb->sb) - 1) /
6765 ocfs2_refcount_recs_per_rb(osb->sb) * 2;
6766 metas.num_metas += metas.num_recs;
6767 *credits += metas.num_recs +
6768 metas.num_recs * OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
6769 if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
6770 *credits += le16_to_cpu(rb->rf_list.l_tree_depth) *
6771 le16_to_cpu(rb->rf_list.l_next_free_rec) + 1;
6772 else
6773 *credits += 1;
6774
6775 /* count in the xattr tree change. */
6776 num_free_extents = ocfs2_num_free_extents(osb, xt_et);
6777 if (num_free_extents < 0) {
6778 ret = num_free_extents;
6779 mlog_errno(ret);
6780 goto out;
6781 }
6782
6783 if (num_free_extents < len)
6784 metas.num_metas += ocfs2_extend_meta_needed(xt_et->et_root_el);
6785
6786 *credits += ocfs2_calc_extend_credits(osb->sb,
6787 xt_et->et_root_el, len);
6788
6789 if (metas.num_metas) {
6790 ret = ocfs2_reserve_new_metadata_blocks(osb, metas.num_metas,
6791 meta_ac);
6792 if (ret) {
6793 mlog_errno(ret);
6794 goto out;
6795 }
6796 }
6797
6798 if (len) {
6799 ret = ocfs2_reserve_clusters(osb, len, data_ac);
6800 if (ret)
6801 mlog_errno(ret);
6802 }
6803 out:
6804 if (ret) {
6805 if (*meta_ac) {
6806 ocfs2_free_alloc_context(*meta_ac);
6807 meta_ac = NULL;
6808 }
6809 }
6810
6811 return ret;
6812 }
6813
6814 static int ocfs2_reflink_xattr_buckets(handle_t *handle,
6815 u64 blkno, u64 new_blkno, u32 clusters,
6816 struct ocfs2_alloc_context *meta_ac,
6817 struct ocfs2_alloc_context *data_ac,
6818 struct ocfs2_reflink_xattr_tree_args *args)
6819 {
6820 int i, j, ret = 0;
6821 struct super_block *sb = args->reflink->old_inode->i_sb;
6822 u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(sb));
6823 u32 num_buckets = clusters * bpc;
6824 int bpb = args->old_bucket->bu_blocks;
6825 struct ocfs2_xattr_value_buf vb = {
6826 .vb_access = ocfs2_journal_access,
6827 };
6828
6829 for (i = 0; i < num_buckets; i++, blkno += bpb, new_blkno += bpb) {
6830 ret = ocfs2_read_xattr_bucket(args->old_bucket, blkno);
6831 if (ret) {
6832 mlog_errno(ret);
6833 break;
6834 }
6835
6836 ret = ocfs2_init_xattr_bucket(args->new_bucket, new_blkno);
6837 if (ret) {
6838 mlog_errno(ret);
6839 break;
6840 }
6841
6842 /*
6843 * The real bucket num in this series of blocks is stored
6844 * in the 1st bucket.
6845 */
6846 if (i == 0)
6847 num_buckets = le16_to_cpu(
6848 bucket_xh(args->old_bucket)->xh_num_buckets);
6849
6850 ret = ocfs2_xattr_bucket_journal_access(handle,
6851 args->new_bucket,
6852 OCFS2_JOURNAL_ACCESS_CREATE);
6853 if (ret) {
6854 mlog_errno(ret);
6855 break;
6856 }
6857
6858 for (j = 0; j < bpb; j++)
6859 memcpy(bucket_block(args->new_bucket, j),
6860 bucket_block(args->old_bucket, j),
6861 sb->s_blocksize);
6862
6863 ocfs2_xattr_bucket_journal_dirty(handle, args->new_bucket);
6864
6865 ret = ocfs2_reflink_xattr_header(handle, args->reflink,
6866 args->old_bucket->bu_bhs[0],
6867 bucket_xh(args->old_bucket),
6868 args->new_bucket->bu_bhs[0],
6869 bucket_xh(args->new_bucket),
6870 &vb, meta_ac,
6871 ocfs2_get_reflink_xattr_value_root,
6872 args);
6873 if (ret) {
6874 mlog_errno(ret);
6875 break;
6876 }
6877
6878 /*
6879 * Re-access and dirty the bucket to calculate metaecc.
6880 * Because we may extend the transaction in reflink_xattr_header
6881 * which will let the already accessed block gone.
6882 */
6883 ret = ocfs2_xattr_bucket_journal_access(handle,
6884 args->new_bucket,
6885 OCFS2_JOURNAL_ACCESS_WRITE);
6886 if (ret) {
6887 mlog_errno(ret);
6888 break;
6889 }
6890
6891 ocfs2_xattr_bucket_journal_dirty(handle, args->new_bucket);
6892 ocfs2_xattr_bucket_relse(args->old_bucket);
6893 ocfs2_xattr_bucket_relse(args->new_bucket);
6894 }
6895
6896 ocfs2_xattr_bucket_relse(args->old_bucket);
6897 ocfs2_xattr_bucket_relse(args->new_bucket);
6898 return ret;
6899 }
6900 /*
6901 * Create the same xattr extent record in the new inode's xattr tree.
6902 */
6903 static int ocfs2_reflink_xattr_rec(struct inode *inode,
6904 struct buffer_head *root_bh,
6905 u64 blkno,
6906 u32 cpos,
6907 u32 len,
6908 void *para)
6909 {
6910 int ret, credits = 0;
6911 u32 p_cluster, num_clusters;
6912 u64 new_blkno;
6913 handle_t *handle;
6914 struct ocfs2_reflink_xattr_tree_args *args =
6915 (struct ocfs2_reflink_xattr_tree_args *)para;
6916 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
6917 struct ocfs2_alloc_context *meta_ac = NULL;
6918 struct ocfs2_alloc_context *data_ac = NULL;
6919 struct ocfs2_extent_tree et;
6920
6921 ocfs2_init_xattr_tree_extent_tree(&et,
6922 INODE_CACHE(args->reflink->new_inode),
6923 args->new_blk_bh);
6924
6925 ret = ocfs2_lock_reflink_xattr_rec_allocators(args, &et, blkno,
6926 len, &credits,
6927 &meta_ac, &data_ac);
6928 if (ret) {
6929 mlog_errno(ret);
6930 goto out;
6931 }
6932
6933 handle = ocfs2_start_trans(osb, credits);
6934 if (IS_ERR(handle)) {
6935 ret = PTR_ERR(handle);
6936 mlog_errno(ret);
6937 goto out;
6938 }
6939
6940 ret = ocfs2_claim_clusters(osb, handle, data_ac,
6941 len, &p_cluster, &num_clusters);
6942 if (ret) {
6943 mlog_errno(ret);
6944 goto out_commit;
6945 }
6946
6947 new_blkno = ocfs2_clusters_to_blocks(osb->sb, p_cluster);
6948
6949 mlog(0, "reflink xattr buckets %llu to %llu, len %u\n",
6950 (unsigned long long)blkno, (unsigned long long)new_blkno, len);
6951 ret = ocfs2_reflink_xattr_buckets(handle, blkno, new_blkno, len,
6952 meta_ac, data_ac, args);
6953 if (ret) {
6954 mlog_errno(ret);
6955 goto out_commit;
6956 }
6957
6958 mlog(0, "insert new xattr extent rec start %llu len %u to %u\n",
6959 (unsigned long long)new_blkno, len, cpos);
6960 ret = ocfs2_insert_extent(handle, &et, cpos, new_blkno,
6961 len, 0, meta_ac);
6962 if (ret)
6963 mlog_errno(ret);
6964
6965 out_commit:
6966 ocfs2_commit_trans(osb, handle);
6967
6968 out:
6969 if (meta_ac)
6970 ocfs2_free_alloc_context(meta_ac);
6971 if (data_ac)
6972 ocfs2_free_alloc_context(data_ac);
6973 return ret;
6974 }
6975
6976 /*
6977 * Create reflinked xattr buckets.
6978 * We will add bucket one by one, and refcount all the xattrs in the bucket
6979 * if they are stored outside.
6980 */
6981 static int ocfs2_reflink_xattr_tree(struct ocfs2_xattr_reflink *args,
6982 struct buffer_head *blk_bh,
6983 struct buffer_head *new_blk_bh)
6984 {
6985 int ret;
6986 struct ocfs2_reflink_xattr_tree_args para;
6987
6988 memset(&para, 0, sizeof(para));
6989 para.reflink = args;
6990 para.old_blk_bh = blk_bh;
6991 para.new_blk_bh = new_blk_bh;
6992
6993 para.old_bucket = ocfs2_xattr_bucket_new(args->old_inode);
6994 if (!para.old_bucket) {
6995 mlog_errno(-ENOMEM);
6996 return -ENOMEM;
6997 }
6998
6999 para.new_bucket = ocfs2_xattr_bucket_new(args->new_inode);
7000 if (!para.new_bucket) {
7001 ret = -ENOMEM;
7002 mlog_errno(ret);
7003 goto out;
7004 }
7005
7006 ret = ocfs2_iterate_xattr_index_block(args->old_inode, blk_bh,
7007 ocfs2_reflink_xattr_rec,
7008 &para);
7009 if (ret)
7010 mlog_errno(ret);
7011
7012 out:
7013 ocfs2_xattr_bucket_free(para.old_bucket);
7014 ocfs2_xattr_bucket_free(para.new_bucket);
7015 return ret;
7016 }
7017
7018 static int ocfs2_reflink_xattr_in_block(struct ocfs2_xattr_reflink *args,
7019 struct buffer_head *blk_bh)
7020 {
7021 int ret, indexed = 0;
7022 struct buffer_head *new_blk_bh = NULL;
7023 struct ocfs2_xattr_block *xb =
7024 (struct ocfs2_xattr_block *)blk_bh->b_data;
7025
7026
7027 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)
7028 indexed = 1;
7029
7030 ret = ocfs2_create_empty_xattr_block(args->new_inode, args->new_bh,
7031 &new_blk_bh, indexed);
7032 if (ret) {
7033 mlog_errno(ret);
7034 goto out;
7035 }
7036
7037 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED))
7038 ret = ocfs2_reflink_xattr_block(args, blk_bh, new_blk_bh);
7039 else
7040 ret = ocfs2_reflink_xattr_tree(args, blk_bh, new_blk_bh);
7041 if (ret)
7042 mlog_errno(ret);
7043
7044 out:
7045 brelse(new_blk_bh);
7046 return ret;
7047 }
7048
7049 static int ocfs2_reflink_xattr_no_security(struct ocfs2_xattr_entry *xe)
7050 {
7051 int type = ocfs2_xattr_get_type(xe);
7052
7053 return type != OCFS2_XATTR_INDEX_SECURITY &&
7054 type != OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS &&
7055 type != OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
7056 }
7057
7058 int ocfs2_reflink_xattrs(struct inode *old_inode,
7059 struct buffer_head *old_bh,
7060 struct inode *new_inode,
7061 struct buffer_head *new_bh,
7062 bool preserve_security)
7063 {
7064 int ret;
7065 struct ocfs2_xattr_reflink args;
7066 struct ocfs2_inode_info *oi = OCFS2_I(old_inode);
7067 struct ocfs2_dinode *di = (struct ocfs2_dinode *)old_bh->b_data;
7068 struct buffer_head *blk_bh = NULL;
7069 struct ocfs2_cached_dealloc_ctxt dealloc;
7070 struct ocfs2_refcount_tree *ref_tree;
7071 struct buffer_head *ref_root_bh = NULL;
7072
7073 ret = ocfs2_lock_refcount_tree(OCFS2_SB(old_inode->i_sb),
7074 le64_to_cpu(di->i_refcount_loc),
7075 1, &ref_tree, &ref_root_bh);
7076 if (ret) {
7077 mlog_errno(ret);
7078 goto out;
7079 }
7080
7081 ocfs2_init_dealloc_ctxt(&dealloc);
7082
7083 args.old_inode = old_inode;
7084 args.new_inode = new_inode;
7085 args.old_bh = old_bh;
7086 args.new_bh = new_bh;
7087 args.ref_ci = &ref_tree->rf_ci;
7088 args.ref_root_bh = ref_root_bh;
7089 args.dealloc = &dealloc;
7090 if (preserve_security)
7091 args.xattr_reflinked = NULL;
7092 else
7093 args.xattr_reflinked = ocfs2_reflink_xattr_no_security;
7094
7095 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
7096 ret = ocfs2_reflink_xattr_inline(&args);
7097 if (ret) {
7098 mlog_errno(ret);
7099 goto out_unlock;
7100 }
7101 }
7102
7103 if (!di->i_xattr_loc)
7104 goto out_unlock;
7105
7106 ret = ocfs2_read_xattr_block(old_inode, le64_to_cpu(di->i_xattr_loc),
7107 &blk_bh);
7108 if (ret < 0) {
7109 mlog_errno(ret);
7110 goto out_unlock;
7111 }
7112
7113 ret = ocfs2_reflink_xattr_in_block(&args, blk_bh);
7114 if (ret)
7115 mlog_errno(ret);
7116
7117 brelse(blk_bh);
7118
7119 out_unlock:
7120 ocfs2_unlock_refcount_tree(OCFS2_SB(old_inode->i_sb),
7121 ref_tree, 1);
7122 brelse(ref_root_bh);
7123
7124 if (ocfs2_dealloc_has_cluster(&dealloc)) {
7125 ocfs2_schedule_truncate_log_flush(OCFS2_SB(old_inode->i_sb), 1);
7126 ocfs2_run_deallocs(OCFS2_SB(old_inode->i_sb), &dealloc);
7127 }
7128
7129 out:
7130 return ret;
7131 }
7132
7133 /*
7134 * Initialize security and acl for a already created inode.
7135 * Used for reflink a non-preserve-security file.
7136 *
7137 * It uses common api like ocfs2_xattr_set, so the caller
7138 * must not hold any lock expect i_mutex.
7139 */
7140 int ocfs2_init_security_and_acl(struct inode *dir,
7141 struct inode *inode)
7142 {
7143 int ret = 0;
7144 struct buffer_head *dir_bh = NULL;
7145 struct ocfs2_security_xattr_info si = {
7146 .enable = 1,
7147 };
7148
7149 ret = ocfs2_init_security_get(inode, dir, &si);
7150 if (!ret) {
7151 ret = ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_SECURITY,
7152 si.name, si.value, si.value_len,
7153 XATTR_CREATE);
7154 if (ret) {
7155 mlog_errno(ret);
7156 goto leave;
7157 }
7158 } else if (ret != -EOPNOTSUPP) {
7159 mlog_errno(ret);
7160 goto leave;
7161 }
7162
7163 ret = ocfs2_inode_lock(dir, &dir_bh, 0);
7164 if (ret) {
7165 mlog_errno(ret);
7166 goto leave;
7167 }
7168
7169 ret = ocfs2_init_acl(NULL, inode, dir, NULL, dir_bh, NULL, NULL);
7170 if (ret)
7171 mlog_errno(ret);
7172
7173 ocfs2_inode_unlock(dir, 0);
7174 brelse(dir_bh);
7175 leave:
7176 return ret;
7177 }
7178 /*
7179 * 'security' attributes support
7180 */
7181 static size_t ocfs2_xattr_security_list(struct dentry *dentry, char *list,
7182 size_t list_size, const char *name,
7183 size_t name_len, int type)
7184 {
7185 const size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
7186 const size_t total_len = prefix_len + name_len + 1;
7187
7188 if (list && total_len <= list_size) {
7189 memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
7190 memcpy(list + prefix_len, name, name_len);
7191 list[prefix_len + name_len] = '\0';
7192 }
7193 return total_len;
7194 }
7195
7196 static int ocfs2_xattr_security_get(struct dentry *dentry, const char *name,
7197 void *buffer, size_t size, int type)
7198 {
7199 if (strcmp(name, "") == 0)
7200 return -EINVAL;
7201 return ocfs2_xattr_get(dentry->d_inode, OCFS2_XATTR_INDEX_SECURITY,
7202 name, buffer, size);
7203 }
7204
7205 static int ocfs2_xattr_security_set(struct dentry *dentry, const char *name,
7206 const void *value, size_t size, int flags, int type)
7207 {
7208 if (strcmp(name, "") == 0)
7209 return -EINVAL;
7210
7211 return ocfs2_xattr_set(dentry->d_inode, OCFS2_XATTR_INDEX_SECURITY,
7212 name, value, size, flags);
7213 }
7214
7215 int ocfs2_init_security_get(struct inode *inode,
7216 struct inode *dir,
7217 struct ocfs2_security_xattr_info *si)
7218 {
7219 /* check whether ocfs2 support feature xattr */
7220 if (!ocfs2_supports_xattr(OCFS2_SB(dir->i_sb)))
7221 return -EOPNOTSUPP;
7222 return security_inode_init_security(inode, dir, &si->name, &si->value,
7223 &si->value_len);
7224 }
7225
7226 int ocfs2_init_security_set(handle_t *handle,
7227 struct inode *inode,
7228 struct buffer_head *di_bh,
7229 struct ocfs2_security_xattr_info *si,
7230 struct ocfs2_alloc_context *xattr_ac,
7231 struct ocfs2_alloc_context *data_ac)
7232 {
7233 return ocfs2_xattr_set_handle(handle, inode, di_bh,
7234 OCFS2_XATTR_INDEX_SECURITY,
7235 si->name, si->value, si->value_len, 0,
7236 xattr_ac, data_ac);
7237 }
7238
7239 struct xattr_handler ocfs2_xattr_security_handler = {
7240 .prefix = XATTR_SECURITY_PREFIX,
7241 .list = ocfs2_xattr_security_list,
7242 .get = ocfs2_xattr_security_get,
7243 .set = ocfs2_xattr_security_set,
7244 };
7245
7246 /*
7247 * 'trusted' attributes support
7248 */
7249 static size_t ocfs2_xattr_trusted_list(struct dentry *dentry, char *list,
7250 size_t list_size, const char *name,
7251 size_t name_len, int type)
7252 {
7253 const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
7254 const size_t total_len = prefix_len + name_len + 1;
7255
7256 if (list && total_len <= list_size) {
7257 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
7258 memcpy(list + prefix_len, name, name_len);
7259 list[prefix_len + name_len] = '\0';
7260 }
7261 return total_len;
7262 }
7263
7264 static int ocfs2_xattr_trusted_get(struct dentry *dentry, const char *name,
7265 void *buffer, size_t size, int type)
7266 {
7267 if (strcmp(name, "") == 0)
7268 return -EINVAL;
7269 return ocfs2_xattr_get(dentry->d_inode, OCFS2_XATTR_INDEX_TRUSTED,
7270 name, buffer, size);
7271 }
7272
7273 static int ocfs2_xattr_trusted_set(struct dentry *dentry, const char *name,
7274 const void *value, size_t size, int flags, int type)
7275 {
7276 if (strcmp(name, "") == 0)
7277 return -EINVAL;
7278
7279 return ocfs2_xattr_set(dentry->d_inode, OCFS2_XATTR_INDEX_TRUSTED,
7280 name, value, size, flags);
7281 }
7282
7283 struct xattr_handler ocfs2_xattr_trusted_handler = {
7284 .prefix = XATTR_TRUSTED_PREFIX,
7285 .list = ocfs2_xattr_trusted_list,
7286 .get = ocfs2_xattr_trusted_get,
7287 .set = ocfs2_xattr_trusted_set,
7288 };
7289
7290 /*
7291 * 'user' attributes support
7292 */
7293 static size_t ocfs2_xattr_user_list(struct dentry *dentry, char *list,
7294 size_t list_size, const char *name,
7295 size_t name_len, int type)
7296 {
7297 const size_t prefix_len = XATTR_USER_PREFIX_LEN;
7298 const size_t total_len = prefix_len + name_len + 1;
7299 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7300
7301 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7302 return 0;
7303
7304 if (list && total_len <= list_size) {
7305 memcpy(list, XATTR_USER_PREFIX, prefix_len);
7306 memcpy(list + prefix_len, name, name_len);
7307 list[prefix_len + name_len] = '\0';
7308 }
7309 return total_len;
7310 }
7311
7312 static int ocfs2_xattr_user_get(struct dentry *dentry, const char *name,
7313 void *buffer, size_t size, int type)
7314 {
7315 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7316
7317 if (strcmp(name, "") == 0)
7318 return -EINVAL;
7319 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7320 return -EOPNOTSUPP;
7321 return ocfs2_xattr_get(dentry->d_inode, OCFS2_XATTR_INDEX_USER, name,
7322 buffer, size);
7323 }
7324
7325 static int ocfs2_xattr_user_set(struct dentry *dentry, const char *name,
7326 const void *value, size_t size, int flags, int type)
7327 {
7328 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7329
7330 if (strcmp(name, "") == 0)
7331 return -EINVAL;
7332 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7333 return -EOPNOTSUPP;
7334
7335 return ocfs2_xattr_set(dentry->d_inode, OCFS2_XATTR_INDEX_USER,
7336 name, value, size, flags);
7337 }
7338
7339 struct xattr_handler ocfs2_xattr_user_handler = {
7340 .prefix = XATTR_USER_PREFIX,
7341 .list = ocfs2_xattr_user_list,
7342 .get = ocfs2_xattr_user_get,
7343 .set = ocfs2_xattr_user_set,
7344 };
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree