?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
ocfs2: Set xattr block entries with ocfs2_xa_set()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ocfs2 / xattr.c
blobfb8568d1e8a1710d5ea1c20ca6c2627664279729
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 int ocfs2_xa_value_truncate(struct ocfs2_xa_loc *loc, u64 bytes,
1873 struct ocfs2_xattr_set_ctxt *ctxt)
1874 {
1875 int trunc_rc, access_rc;
1876 struct ocfs2_xattr_value_buf vb;
1877
1878 ocfs2_xa_fill_value_buf(loc, &vb);
1879 trunc_rc = ocfs2_xattr_value_truncate(loc->xl_inode, &vb, bytes,
1880 ctxt);
1881
1882 /*
1883 * The caller of ocfs2_xa_value_truncate() has already called
1884 * ocfs2_xa_journal_access on the loc. However, The truncate code
1885 * calls ocfs2_extend_trans(). This may commit the previous
1886 * transaction and open a new one. If this is a bucket, truncate
1887 * could leave only vb->vb_bh set up for journaling. Meanwhile,
1888 * the caller is expecting to dirty the entire bucket. So we must
1889 * reset the journal work. We do this even if truncate has failed,
1890 * as it could have failed after committing the extend.
1891 */
1892 access_rc = ocfs2_xa_journal_access(ctxt->handle, loc,
1893 OCFS2_JOURNAL_ACCESS_WRITE);
1894
1895 /* Errors in truncate take precedence */
1896 return trunc_rc ? trunc_rc : access_rc;
1897 }
1898
1899 static void ocfs2_xa_remove_entry(struct ocfs2_xa_loc *loc)
1900 {
1901 int index, count;
1902 struct ocfs2_xattr_header *xh = loc->xl_header;
1903 struct ocfs2_xattr_entry *entry = loc->xl_entry;
1904
1905 ocfs2_xa_wipe_namevalue(loc);
1906 loc->xl_entry = NULL;
1907
1908 le16_add_cpu(&xh->xh_count, -1);
1909 count = le16_to_cpu(xh->xh_count);
1910
1911 /*
1912 * Only zero out the entry if there are more remaining. This is
1913 * important for an empty bucket, as it keeps track of the
1914 * bucket's hash value. It doesn't hurt empty block storage.
1915 */
1916 if (count) {
1917 index = ((char *)entry - (char *)&xh->xh_entries) /
1918 sizeof(struct ocfs2_xattr_entry);
1919 memmove(&xh->xh_entries[index], &xh->xh_entries[index + 1],
1920 (count - index) * sizeof(struct ocfs2_xattr_entry));
1921 memset(&xh->xh_entries[count], 0,
1922 sizeof(struct ocfs2_xattr_entry));
1923 }
1924 }
1925
1926 static int ocfs2_xa_remove(struct ocfs2_xa_loc *loc,
1927 struct ocfs2_xattr_set_ctxt *ctxt)
1928 {
1929 int rc = 0;
1930
1931 if (!ocfs2_xattr_is_local(loc->xl_entry)) {
1932 rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
1933 if (rc) {
1934 mlog_errno(rc);
1935 goto out;
1936 }
1937 }
1938
1939 ocfs2_xa_remove_entry(loc);
1940
1941 out:
1942 return rc;
1943 }
1944
1945 static void ocfs2_xa_install_value_root(struct ocfs2_xa_loc *loc)
1946 {
1947 int name_size = OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len);
1948 char *nameval_buf;
1949
1950 nameval_buf = ocfs2_xa_offset_pointer(loc,
1951 le16_to_cpu(loc->xl_entry->xe_name_offset));
1952 memcpy(nameval_buf + name_size, &def_xv, OCFS2_XATTR_ROOT_SIZE);
1953 }
1954
1955 /*
1956 * Take an existing entry and make it ready for the new value. This
1957 * won't allocate space, but it may free space. It should be ready for
1958 * ocfs2_xa_prepare_entry() to finish the work.
1959 */
1960 static int ocfs2_xa_reuse_entry(struct ocfs2_xa_loc *loc,
1961 struct ocfs2_xattr_info *xi,
1962 struct ocfs2_xattr_set_ctxt *ctxt)
1963 {
1964 int rc = 0;
1965 int name_size = OCFS2_XATTR_SIZE(xi->xi_name_len);
1966 char *nameval_buf;
1967 int xe_local = ocfs2_xattr_is_local(loc->xl_entry);
1968 int xi_local = xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE;
1969
1970 BUG_ON(OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len) !=
1971 name_size);
1972
1973 nameval_buf = ocfs2_xa_offset_pointer(loc,
1974 le16_to_cpu(loc->xl_entry->xe_name_offset));
1975 if (xe_local) {
1976 memset(nameval_buf + name_size, 0,
1977 namevalue_size_xe(loc->xl_entry) - name_size);
1978 if (!xi_local)
1979 ocfs2_xa_install_value_root(loc);
1980 } else {
1981 if (xi_local) {
1982 rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
1983 if (rc < 0) {
1984 mlog_errno(rc);
1985 goto out;
1986 }
1987 memset(nameval_buf + name_size, 0,
1988 namevalue_size_xe(loc->xl_entry) -
1989 name_size);
1990 } else if (le64_to_cpu(loc->xl_entry->xe_value_size) >
1991 xi->xi_value_len) {
1992 rc = ocfs2_xa_value_truncate(loc, xi->xi_value_len,
1993 ctxt);
1994 if (rc < 0) {
1995 mlog_errno(rc);
1996 goto out;
1997 }
1998 }
1999 }
2000
2001 loc->xl_entry->xe_value_size = cpu_to_le64(xi->xi_value_len);
2002 ocfs2_xattr_set_local(loc->xl_entry, xi_local);
2003
2004 out:
2005 return rc;
2006 }
2007
2008 /*
2009 * Prepares loc->xl_entry to receive the new xattr. This includes
2010 * properly setting up the name+value pair region. If loc->xl_entry
2011 * already exists, it will take care of modifying it appropriately.
2012 *
2013 * Note that this modifies the data. You did journal_access already,
2014 * right?
2015 */
2016 static int ocfs2_xa_prepare_entry(struct ocfs2_xa_loc *loc,
2017 struct ocfs2_xattr_info *xi,
2018 u32 name_hash,
2019 struct ocfs2_xattr_set_ctxt *ctxt)
2020 {
2021 int rc = 0;
2022
2023 rc = ocfs2_xa_check_space(loc, xi);
2024 if (rc)
2025 goto out;
2026
2027 if (loc->xl_entry) {
2028 if (ocfs2_xa_can_reuse_entry(loc, xi)) {
2029 rc = ocfs2_xa_reuse_entry(loc, xi, ctxt);
2030 if (rc)
2031 goto out;
2032 goto alloc_value;
2033 }
2034
2035 if (!ocfs2_xattr_is_local(loc->xl_entry)) {
2036 rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2037 if (rc) {
2038 mlog_errno(rc);
2039 goto out;
2040 }
2041 }
2042 ocfs2_xa_wipe_namevalue(loc);
2043 } else
2044 ocfs2_xa_add_entry(loc, name_hash);
2045
2046 /*
2047 * If we get here, we have a blank entry. Fill it. We grow our
2048 * name+value pair back from the end.
2049 */
2050 ocfs2_xa_add_namevalue(loc, xi);
2051 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE)
2052 ocfs2_xa_install_value_root(loc);
2053
2054 alloc_value:
2055 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
2056 rc = ocfs2_xa_value_truncate(loc, xi->xi_value_len, ctxt);
2057 if (rc < 0)
2058 mlog_errno(rc);
2059 }
2060
2061 out:
2062 return rc;
2063 }
2064
2065 /*
2066 * Store the value portion of the name+value pair. This will skip
2067 * values that are stored externally. Their tree roots were set up
2068 * by ocfs2_xa_prepare_entry().
2069 */
2070 static int ocfs2_xa_store_value(struct ocfs2_xa_loc *loc,
2071 struct ocfs2_xattr_info *xi,
2072 struct ocfs2_xattr_set_ctxt *ctxt)
2073 {
2074 int rc = 0;
2075 int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
2076 int name_size = OCFS2_XATTR_SIZE(xi->xi_name_len);
2077 char *nameval_buf;
2078 struct ocfs2_xattr_value_buf vb;
2079
2080 nameval_buf = ocfs2_xa_offset_pointer(loc, nameval_offset);
2081 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
2082 ocfs2_xa_fill_value_buf(loc, &vb);
2083 rc = __ocfs2_xattr_set_value_outside(loc->xl_inode,
2084 ctxt->handle, &vb,
2085 xi->xi_value,
2086 xi->xi_value_len);
2087 } else
2088 memcpy(nameval_buf + name_size, xi->xi_value, xi->xi_value_len);
2089
2090 return rc;
2091 }
2092
2093 static int ocfs2_xa_set(struct ocfs2_xa_loc *loc,
2094 struct ocfs2_xattr_info *xi,
2095 struct ocfs2_xattr_set_ctxt *ctxt)
2096 {
2097 int ret;
2098 u32 name_hash = ocfs2_xattr_name_hash(loc->xl_inode, xi->xi_name,
2099 xi->xi_name_len);
2100
2101 ret = ocfs2_xa_journal_access(ctxt->handle, loc,
2102 OCFS2_JOURNAL_ACCESS_WRITE);
2103 if (ret) {
2104 mlog_errno(ret);
2105 goto out;
2106 }
2107
2108 /* Don't worry, we are never called with !xi_value and !xl_entry */
2109 if (!xi->xi_value) {
2110 ret = ocfs2_xa_remove(loc, ctxt);
2111 goto out;
2112 }
2113
2114 ret = ocfs2_xa_prepare_entry(loc, xi, name_hash, ctxt);
2115 if (ret) {
2116 if (ret != -ENOSPC)
2117 mlog_errno(ret);
2118 goto out;
2119 }
2120
2121 ret = ocfs2_xa_store_value(loc, xi, ctxt);
2122 if (ret) {
2123 mlog_errno(ret);
2124 goto out;
2125 }
2126
2127 ocfs2_xa_journal_dirty(ctxt->handle, loc);
2128
2129 out:
2130 return ret;
2131 }
2132
2133 static void ocfs2_init_dinode_xa_loc(struct ocfs2_xa_loc *loc,
2134 struct inode *inode,
2135 struct buffer_head *bh,
2136 struct ocfs2_xattr_entry *entry)
2137 {
2138 struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
2139
2140 loc->xl_inode = inode;
2141 loc->xl_ops = &ocfs2_xa_block_loc_ops;
2142 loc->xl_storage = bh;
2143 loc->xl_entry = entry;
2144
2145 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
2146 loc->xl_size = le16_to_cpu(di->i_xattr_inline_size);
2147 else {
2148 BUG_ON(entry);
2149 loc->xl_size = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
2150 }
2151 loc->xl_header =
2152 (struct ocfs2_xattr_header *)(bh->b_data + bh->b_size -
2153 loc->xl_size);
2154 }
2155
2156 static void ocfs2_init_xattr_block_xa_loc(struct ocfs2_xa_loc *loc,
2157 struct inode *inode,
2158 struct buffer_head *bh,
2159 struct ocfs2_xattr_entry *entry)
2160 {
2161 struct ocfs2_xattr_block *xb =
2162 (struct ocfs2_xattr_block *)bh->b_data;
2163
2164 BUG_ON(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED);
2165
2166 loc->xl_inode = inode;
2167 loc->xl_ops = &ocfs2_xa_block_loc_ops;
2168 loc->xl_storage = bh;
2169 loc->xl_header = &(xb->xb_attrs.xb_header);
2170 loc->xl_entry = entry;
2171 loc->xl_size = bh->b_size - offsetof(struct ocfs2_xattr_block,
2172 xb_attrs.xb_header);
2173 }
2174
2175 static void ocfs2_init_xattr_bucket_xa_loc(struct ocfs2_xa_loc *loc,
2176 struct ocfs2_xattr_bucket *bucket,
2177 struct ocfs2_xattr_entry *entry)
2178 {
2179 loc->xl_inode = bucket->bu_inode;
2180 loc->xl_ops = &ocfs2_xa_bucket_loc_ops;
2181 loc->xl_storage = bucket;
2182 loc->xl_header = bucket_xh(bucket);
2183 loc->xl_entry = entry;
2184 loc->xl_size = OCFS2_XATTR_BUCKET_SIZE;
2185 }
2186
2187
2188 /*
2189 * ocfs2_xattr_set_entry()
2190 *
2191 * Set extended attribute entry into inode or block.
2192 *
2193 * If extended attribute value size > OCFS2_XATTR_INLINE_SIZE,
2194 * We first insert tree root(ocfs2_xattr_value_root) like a normal value,
2195 * then set value in B tree with set_value_outside().
2196 */
2197 static int ocfs2_xattr_set_entry(struct inode *inode,
2198 struct ocfs2_xattr_info *xi,
2199 struct ocfs2_xattr_search *xs,
2200 struct ocfs2_xattr_set_ctxt *ctxt,
2201 int flag)
2202 {
2203 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2204 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2205 handle_t *handle = ctxt->handle;
2206 int ret;
2207 struct ocfs2_xa_loc loc;
2208
2209 BUG_ON(!(flag & OCFS2_INLINE_XATTR_FL));
2210 BUG_ON(xs->xattr_bh != xs->inode_bh);
2211
2212 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), xs->inode_bh,
2213 OCFS2_JOURNAL_ACCESS_WRITE);
2214 if (ret) {
2215 mlog_errno(ret);
2216 goto out;
2217 }
2218
2219 ocfs2_init_dinode_xa_loc(&loc, inode, xs->inode_bh,
2220 xs->not_found ? NULL : xs->here);
2221 ret = ocfs2_xa_set(&loc, xi, ctxt);
2222 if (ret) {
2223 if (ret != -ENOSPC)
2224 mlog_errno(ret);
2225 goto out;
2226 }
2227 xs->here = loc.xl_entry;
2228
2229 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2230 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2231 unsigned int xattrsize = osb->s_xattr_inline_size;
2232
2233 /*
2234 * Adjust extent record count or inline data size
2235 * to reserve space for extended attribute.
2236 */
2237 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2238 struct ocfs2_inline_data *idata = &di->id2.i_data;
2239 le16_add_cpu(&idata->id_count, -xattrsize);
2240 } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
2241 struct ocfs2_extent_list *el = &di->id2.i_list;
2242 le16_add_cpu(&el->l_count, -(xattrsize /
2243 sizeof(struct ocfs2_extent_rec)));
2244 }
2245 di->i_xattr_inline_size = cpu_to_le16(xattrsize);
2246 }
2247 /* Update xattr flag */
2248 spin_lock(&oi->ip_lock);
2249 oi->ip_dyn_features |= OCFS2_INLINE_XATTR_FL;
2250 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
2251 spin_unlock(&oi->ip_lock);
2252
2253 ret = ocfs2_journal_dirty(handle, xs->inode_bh);
2254 if (ret < 0)
2255 mlog_errno(ret);
2256
2257 out:
2258 return ret;
2259 }
2260
2261 /*
2262 * In xattr remove, if it is stored outside and refcounted, we may have
2263 * the chance to split the refcount tree. So need the allocators.
2264 */
2265 static int ocfs2_lock_xattr_remove_allocators(struct inode *inode,
2266 struct ocfs2_xattr_value_root *xv,
2267 struct ocfs2_caching_info *ref_ci,
2268 struct buffer_head *ref_root_bh,
2269 struct ocfs2_alloc_context **meta_ac,
2270 int *ref_credits)
2271 {
2272 int ret, meta_add = 0;
2273 u32 p_cluster, num_clusters;
2274 unsigned int ext_flags;
2275
2276 *ref_credits = 0;
2277 ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
2278 &num_clusters,
2279 &xv->xr_list,
2280 &ext_flags);
2281 if (ret) {
2282 mlog_errno(ret);
2283 goto out;
2284 }
2285
2286 if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
2287 goto out;
2288
2289 ret = ocfs2_refcounted_xattr_delete_need(inode, ref_ci,
2290 ref_root_bh, xv,
2291 &meta_add, ref_credits);
2292 if (ret) {
2293 mlog_errno(ret);
2294 goto out;
2295 }
2296
2297 ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb),
2298 meta_add, meta_ac);
2299 if (ret)
2300 mlog_errno(ret);
2301
2302 out:
2303 return ret;
2304 }
2305
2306 static int ocfs2_remove_value_outside(struct inode*inode,
2307 struct ocfs2_xattr_value_buf *vb,
2308 struct ocfs2_xattr_header *header,
2309 struct ocfs2_caching_info *ref_ci,
2310 struct buffer_head *ref_root_bh)
2311 {
2312 int ret = 0, i, ref_credits;
2313 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2314 struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
2315 void *val;
2316
2317 ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
2318
2319 for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
2320 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
2321
2322 if (ocfs2_xattr_is_local(entry))
2323 continue;
2324
2325 val = (void *)header +
2326 le16_to_cpu(entry->xe_name_offset);
2327 vb->vb_xv = (struct ocfs2_xattr_value_root *)
2328 (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
2329
2330 ret = ocfs2_lock_xattr_remove_allocators(inode, vb->vb_xv,
2331 ref_ci, ref_root_bh,
2332 &ctxt.meta_ac,
2333 &ref_credits);
2334
2335 ctxt.handle = ocfs2_start_trans(osb, ref_credits +
2336 ocfs2_remove_extent_credits(osb->sb));
2337 if (IS_ERR(ctxt.handle)) {
2338 ret = PTR_ERR(ctxt.handle);
2339 mlog_errno(ret);
2340 break;
2341 }
2342
2343 ret = ocfs2_xattr_value_truncate(inode, vb, 0, &ctxt);
2344 if (ret < 0) {
2345 mlog_errno(ret);
2346 break;
2347 }
2348
2349 ocfs2_commit_trans(osb, ctxt.handle);
2350 if (ctxt.meta_ac) {
2351 ocfs2_free_alloc_context(ctxt.meta_ac);
2352 ctxt.meta_ac = NULL;
2353 }
2354 }
2355
2356 if (ctxt.meta_ac)
2357 ocfs2_free_alloc_context(ctxt.meta_ac);
2358 ocfs2_schedule_truncate_log_flush(osb, 1);
2359 ocfs2_run_deallocs(osb, &ctxt.dealloc);
2360 return ret;
2361 }
2362
2363 static int ocfs2_xattr_ibody_remove(struct inode *inode,
2364 struct buffer_head *di_bh,
2365 struct ocfs2_caching_info *ref_ci,
2366 struct buffer_head *ref_root_bh)
2367 {
2368
2369 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2370 struct ocfs2_xattr_header *header;
2371 int ret;
2372 struct ocfs2_xattr_value_buf vb = {
2373 .vb_bh = di_bh,
2374 .vb_access = ocfs2_journal_access_di,
2375 };
2376
2377 header = (struct ocfs2_xattr_header *)
2378 ((void *)di + inode->i_sb->s_blocksize -
2379 le16_to_cpu(di->i_xattr_inline_size));
2380
2381 ret = ocfs2_remove_value_outside(inode, &vb, header,
2382 ref_ci, ref_root_bh);
2383
2384 return ret;
2385 }
2386
2387 struct ocfs2_rm_xattr_bucket_para {
2388 struct ocfs2_caching_info *ref_ci;
2389 struct buffer_head *ref_root_bh;
2390 };
2391
2392 static int ocfs2_xattr_block_remove(struct inode *inode,
2393 struct buffer_head *blk_bh,
2394 struct ocfs2_caching_info *ref_ci,
2395 struct buffer_head *ref_root_bh)
2396 {
2397 struct ocfs2_xattr_block *xb;
2398 int ret = 0;
2399 struct ocfs2_xattr_value_buf vb = {
2400 .vb_bh = blk_bh,
2401 .vb_access = ocfs2_journal_access_xb,
2402 };
2403 struct ocfs2_rm_xattr_bucket_para args = {
2404 .ref_ci = ref_ci,
2405 .ref_root_bh = ref_root_bh,
2406 };
2407
2408 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2409 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2410 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
2411 ret = ocfs2_remove_value_outside(inode, &vb, header,
2412 ref_ci, ref_root_bh);
2413 } else
2414 ret = ocfs2_iterate_xattr_index_block(inode,
2415 blk_bh,
2416 ocfs2_rm_xattr_cluster,
2417 &args);
2418
2419 return ret;
2420 }
2421
2422 static int ocfs2_xattr_free_block(struct inode *inode,
2423 u64 block,
2424 struct ocfs2_caching_info *ref_ci,
2425 struct buffer_head *ref_root_bh)
2426 {
2427 struct inode *xb_alloc_inode;
2428 struct buffer_head *xb_alloc_bh = NULL;
2429 struct buffer_head *blk_bh = NULL;
2430 struct ocfs2_xattr_block *xb;
2431 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2432 handle_t *handle;
2433 int ret = 0;
2434 u64 blk, bg_blkno;
2435 u16 bit;
2436
2437 ret = ocfs2_read_xattr_block(inode, block, &blk_bh);
2438 if (ret < 0) {
2439 mlog_errno(ret);
2440 goto out;
2441 }
2442
2443 ret = ocfs2_xattr_block_remove(inode, blk_bh, ref_ci, ref_root_bh);
2444 if (ret < 0) {
2445 mlog_errno(ret);
2446 goto out;
2447 }
2448
2449 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2450 blk = le64_to_cpu(xb->xb_blkno);
2451 bit = le16_to_cpu(xb->xb_suballoc_bit);
2452 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
2453
2454 xb_alloc_inode = ocfs2_get_system_file_inode(osb,
2455 EXTENT_ALLOC_SYSTEM_INODE,
2456 le16_to_cpu(xb->xb_suballoc_slot));
2457 if (!xb_alloc_inode) {
2458 ret = -ENOMEM;
2459 mlog_errno(ret);
2460 goto out;
2461 }
2462 mutex_lock(&xb_alloc_inode->i_mutex);
2463
2464 ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
2465 if (ret < 0) {
2466 mlog_errno(ret);
2467 goto out_mutex;
2468 }
2469
2470 handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
2471 if (IS_ERR(handle)) {
2472 ret = PTR_ERR(handle);
2473 mlog_errno(ret);
2474 goto out_unlock;
2475 }
2476
2477 ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
2478 bit, bg_blkno, 1);
2479 if (ret < 0)
2480 mlog_errno(ret);
2481
2482 ocfs2_commit_trans(osb, handle);
2483 out_unlock:
2484 ocfs2_inode_unlock(xb_alloc_inode, 1);
2485 brelse(xb_alloc_bh);
2486 out_mutex:
2487 mutex_unlock(&xb_alloc_inode->i_mutex);
2488 iput(xb_alloc_inode);
2489 out:
2490 brelse(blk_bh);
2491 return ret;
2492 }
2493
2494 /*
2495 * ocfs2_xattr_remove()
2496 *
2497 * Free extended attribute resources associated with this inode.
2498 */
2499 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
2500 {
2501 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2502 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2503 struct ocfs2_refcount_tree *ref_tree = NULL;
2504 struct buffer_head *ref_root_bh = NULL;
2505 struct ocfs2_caching_info *ref_ci = NULL;
2506 handle_t *handle;
2507 int ret;
2508
2509 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2510 return 0;
2511
2512 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
2513 return 0;
2514
2515 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) {
2516 ret = ocfs2_lock_refcount_tree(OCFS2_SB(inode->i_sb),
2517 le64_to_cpu(di->i_refcount_loc),
2518 1, &ref_tree, &ref_root_bh);
2519 if (ret) {
2520 mlog_errno(ret);
2521 goto out;
2522 }
2523 ref_ci = &ref_tree->rf_ci;
2524
2525 }
2526
2527 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2528 ret = ocfs2_xattr_ibody_remove(inode, di_bh,
2529 ref_ci, ref_root_bh);
2530 if (ret < 0) {
2531 mlog_errno(ret);
2532 goto out;
2533 }
2534 }
2535
2536 if (di->i_xattr_loc) {
2537 ret = ocfs2_xattr_free_block(inode,
2538 le64_to_cpu(di->i_xattr_loc),
2539 ref_ci, ref_root_bh);
2540 if (ret < 0) {
2541 mlog_errno(ret);
2542 goto out;
2543 }
2544 }
2545
2546 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
2547 OCFS2_INODE_UPDATE_CREDITS);
2548 if (IS_ERR(handle)) {
2549 ret = PTR_ERR(handle);
2550 mlog_errno(ret);
2551 goto out;
2552 }
2553 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
2554 OCFS2_JOURNAL_ACCESS_WRITE);
2555 if (ret) {
2556 mlog_errno(ret);
2557 goto out_commit;
2558 }
2559
2560 di->i_xattr_loc = 0;
2561
2562 spin_lock(&oi->ip_lock);
2563 oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
2564 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
2565 spin_unlock(&oi->ip_lock);
2566
2567 ret = ocfs2_journal_dirty(handle, di_bh);
2568 if (ret < 0)
2569 mlog_errno(ret);
2570 out_commit:
2571 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
2572 out:
2573 if (ref_tree)
2574 ocfs2_unlock_refcount_tree(OCFS2_SB(inode->i_sb), ref_tree, 1);
2575 brelse(ref_root_bh);
2576 return ret;
2577 }
2578
2579 static int ocfs2_xattr_has_space_inline(struct inode *inode,
2580 struct ocfs2_dinode *di)
2581 {
2582 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2583 unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
2584 int free;
2585
2586 if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
2587 return 0;
2588
2589 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2590 struct ocfs2_inline_data *idata = &di->id2.i_data;
2591 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
2592 } else if (ocfs2_inode_is_fast_symlink(inode)) {
2593 free = ocfs2_fast_symlink_chars(inode->i_sb) -
2594 le64_to_cpu(di->i_size);
2595 } else {
2596 struct ocfs2_extent_list *el = &di->id2.i_list;
2597 free = (le16_to_cpu(el->l_count) -
2598 le16_to_cpu(el->l_next_free_rec)) *
2599 sizeof(struct ocfs2_extent_rec);
2600 }
2601 if (free >= xattrsize)
2602 return 1;
2603
2604 return 0;
2605 }
2606
2607 /*
2608 * ocfs2_xattr_ibody_find()
2609 *
2610 * Find extended attribute in inode block and
2611 * fill search info into struct ocfs2_xattr_search.
2612 */
2613 static int ocfs2_xattr_ibody_find(struct inode *inode,
2614 int name_index,
2615 const char *name,
2616 struct ocfs2_xattr_search *xs)
2617 {
2618 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2619 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2620 int ret;
2621 int has_space = 0;
2622
2623 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2624 return 0;
2625
2626 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2627 down_read(&oi->ip_alloc_sem);
2628 has_space = ocfs2_xattr_has_space_inline(inode, di);
2629 up_read(&oi->ip_alloc_sem);
2630 if (!has_space)
2631 return 0;
2632 }
2633
2634 xs->xattr_bh = xs->inode_bh;
2635 xs->end = (void *)di + inode->i_sb->s_blocksize;
2636 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
2637 xs->header = (struct ocfs2_xattr_header *)
2638 (xs->end - le16_to_cpu(di->i_xattr_inline_size));
2639 else
2640 xs->header = (struct ocfs2_xattr_header *)
2641 (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
2642 xs->base = (void *)xs->header;
2643 xs->here = xs->header->xh_entries;
2644
2645 /* Find the named attribute. */
2646 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2647 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2648 if (ret && ret != -ENODATA)
2649 return ret;
2650 xs->not_found = ret;
2651 }
2652
2653 return 0;
2654 }
2655
2656 /*
2657 * ocfs2_xattr_ibody_set()
2658 *
2659 * Set, replace or remove an extended attribute into inode block.
2660 *
2661 */
2662 static int ocfs2_xattr_ibody_set(struct inode *inode,
2663 struct ocfs2_xattr_info *xi,
2664 struct ocfs2_xattr_search *xs,
2665 struct ocfs2_xattr_set_ctxt *ctxt)
2666 {
2667 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2668 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2669 int ret;
2670
2671 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2672 return -ENOSPC;
2673
2674 down_write(&oi->ip_alloc_sem);
2675 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2676 if (!ocfs2_xattr_has_space_inline(inode, di)) {
2677 ret = -ENOSPC;
2678 goto out;
2679 }
2680 }
2681
2682 ret = ocfs2_xattr_set_entry(inode, xi, xs, ctxt,
2683 (OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL));
2684 out:
2685 up_write(&oi->ip_alloc_sem);
2686
2687 return ret;
2688 }
2689
2690 /*
2691 * ocfs2_xattr_block_find()
2692 *
2693 * Find extended attribute in external block and
2694 * fill search info into struct ocfs2_xattr_search.
2695 */
2696 static int ocfs2_xattr_block_find(struct inode *inode,
2697 int name_index,
2698 const char *name,
2699 struct ocfs2_xattr_search *xs)
2700 {
2701 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2702 struct buffer_head *blk_bh = NULL;
2703 struct ocfs2_xattr_block *xb;
2704 int ret = 0;
2705
2706 if (!di->i_xattr_loc)
2707 return ret;
2708
2709 ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
2710 &blk_bh);
2711 if (ret < 0) {
2712 mlog_errno(ret);
2713 return ret;
2714 }
2715
2716 xs->xattr_bh = blk_bh;
2717 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2718
2719 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2720 xs->header = &xb->xb_attrs.xb_header;
2721 xs->base = (void *)xs->header;
2722 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
2723 xs->here = xs->header->xh_entries;
2724
2725 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2726 } else
2727 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
2728 name_index,
2729 name, xs);
2730
2731 if (ret && ret != -ENODATA) {
2732 xs->xattr_bh = NULL;
2733 goto cleanup;
2734 }
2735 xs->not_found = ret;
2736 return 0;
2737 cleanup:
2738 brelse(blk_bh);
2739
2740 return ret;
2741 }
2742
2743 static int ocfs2_create_xattr_block(struct inode *inode,
2744 struct buffer_head *inode_bh,
2745 struct ocfs2_xattr_set_ctxt *ctxt,
2746 int indexed,
2747 struct buffer_head **ret_bh)
2748 {
2749 int ret;
2750 u16 suballoc_bit_start;
2751 u32 num_got;
2752 u64 first_blkno;
2753 struct ocfs2_dinode *di = (struct ocfs2_dinode *)inode_bh->b_data;
2754 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2755 struct buffer_head *new_bh = NULL;
2756 struct ocfs2_xattr_block *xblk;
2757
2758 ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
2759 inode_bh, OCFS2_JOURNAL_ACCESS_CREATE);
2760 if (ret < 0) {
2761 mlog_errno(ret);
2762 goto end;
2763 }
2764
2765 ret = ocfs2_claim_metadata(osb, ctxt->handle, ctxt->meta_ac, 1,
2766 &suballoc_bit_start, &num_got,
2767 &first_blkno);
2768 if (ret < 0) {
2769 mlog_errno(ret);
2770 goto end;
2771 }
2772
2773 new_bh = sb_getblk(inode->i_sb, first_blkno);
2774 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), new_bh);
2775
2776 ret = ocfs2_journal_access_xb(ctxt->handle, INODE_CACHE(inode),
2777 new_bh,
2778 OCFS2_JOURNAL_ACCESS_CREATE);
2779 if (ret < 0) {
2780 mlog_errno(ret);
2781 goto end;
2782 }
2783
2784 /* Initialize ocfs2_xattr_block */
2785 xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
2786 memset(xblk, 0, inode->i_sb->s_blocksize);
2787 strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
2788 xblk->xb_suballoc_slot = cpu_to_le16(ctxt->meta_ac->ac_alloc_slot);
2789 xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
2790 xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation);
2791 xblk->xb_blkno = cpu_to_le64(first_blkno);
2792 if (indexed) {
2793 struct ocfs2_xattr_tree_root *xr = &xblk->xb_attrs.xb_root;
2794 xr->xt_clusters = cpu_to_le32(1);
2795 xr->xt_last_eb_blk = 0;
2796 xr->xt_list.l_tree_depth = 0;
2797 xr->xt_list.l_count = cpu_to_le16(
2798 ocfs2_xattr_recs_per_xb(inode->i_sb));
2799 xr->xt_list.l_next_free_rec = cpu_to_le16(1);
2800 xblk->xb_flags = cpu_to_le16(OCFS2_XATTR_INDEXED);
2801 }
2802 ocfs2_journal_dirty(ctxt->handle, new_bh);
2803
2804 /* Add it to the inode */
2805 di->i_xattr_loc = cpu_to_le64(first_blkno);
2806
2807 spin_lock(&OCFS2_I(inode)->ip_lock);
2808 OCFS2_I(inode)->ip_dyn_features |= OCFS2_HAS_XATTR_FL;
2809 di->i_dyn_features = cpu_to_le16(OCFS2_I(inode)->ip_dyn_features);
2810 spin_unlock(&OCFS2_I(inode)->ip_lock);
2811
2812 ocfs2_journal_dirty(ctxt->handle, inode_bh);
2813
2814 *ret_bh = new_bh;
2815 new_bh = NULL;
2816
2817 end:
2818 brelse(new_bh);
2819 return ret;
2820 }
2821
2822 /*
2823 * ocfs2_xattr_block_set()
2824 *
2825 * Set, replace or remove an extended attribute into external block.
2826 *
2827 */
2828 static int ocfs2_xattr_block_set(struct inode *inode,
2829 struct ocfs2_xattr_info *xi,
2830 struct ocfs2_xattr_search *xs,
2831 struct ocfs2_xattr_set_ctxt *ctxt)
2832 {
2833 struct buffer_head *new_bh = NULL;
2834 struct ocfs2_xattr_block *xblk = NULL;
2835 int ret;
2836 struct ocfs2_xa_loc loc;
2837
2838 if (!xs->xattr_bh) {
2839 ret = ocfs2_create_xattr_block(inode, xs->inode_bh, ctxt,
2840 0, &new_bh);
2841 if (ret) {
2842 mlog_errno(ret);
2843 goto end;
2844 }
2845
2846 xs->xattr_bh = new_bh;
2847 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2848 xs->header = &xblk->xb_attrs.xb_header;
2849 xs->base = (void *)xs->header;
2850 xs->end = (void *)xblk + inode->i_sb->s_blocksize;
2851 xs->here = xs->header->xh_entries;
2852 } else
2853 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2854
2855 if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
2856 ocfs2_init_xattr_block_xa_loc(&loc, inode, xs->xattr_bh,
2857 xs->not_found ? NULL : xs->here);
2858
2859 ret = ocfs2_xa_set(&loc, xi, ctxt);
2860 if (!ret)
2861 xs->here = loc.xl_entry;
2862 else if (ret != -ENOSPC)
2863 goto end;
2864 else {
2865 ret = ocfs2_xattr_create_index_block(inode, xs, ctxt);
2866 if (ret)
2867 goto end;
2868 }
2869 }
2870
2871 if (le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)
2872 ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs, ctxt);
2873
2874 end:
2875 return ret;
2876 }
2877
2878 /* Check whether the new xattr can be inserted into the inode. */
2879 static int ocfs2_xattr_can_be_in_inode(struct inode *inode,
2880 struct ocfs2_xattr_info *xi,
2881 struct ocfs2_xattr_search *xs)
2882 {
2883 struct ocfs2_xattr_entry *last;
2884 int free, i;
2885 size_t min_offs = xs->end - xs->base;
2886
2887 if (!xs->header)
2888 return 0;
2889
2890 last = xs->header->xh_entries;
2891
2892 for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
2893 size_t offs = le16_to_cpu(last->xe_name_offset);
2894 if (offs < min_offs)
2895 min_offs = offs;
2896 last += 1;
2897 }
2898
2899 free = min_offs - ((void *)last - xs->base) - OCFS2_XATTR_HEADER_GAP;
2900 if (free < 0)
2901 return 0;
2902
2903 BUG_ON(!xs->not_found);
2904
2905 if (free >= (sizeof(struct ocfs2_xattr_entry) + namevalue_size_xi(xi)))
2906 return 1;
2907
2908 return 0;
2909 }
2910
2911 static int ocfs2_calc_xattr_set_need(struct inode *inode,
2912 struct ocfs2_dinode *di,
2913 struct ocfs2_xattr_info *xi,
2914 struct ocfs2_xattr_search *xis,
2915 struct ocfs2_xattr_search *xbs,
2916 int *clusters_need,
2917 int *meta_need,
2918 int *credits_need)
2919 {
2920 int ret = 0, old_in_xb = 0;
2921 int clusters_add = 0, meta_add = 0, credits = 0;
2922 struct buffer_head *bh = NULL;
2923 struct ocfs2_xattr_block *xb = NULL;
2924 struct ocfs2_xattr_entry *xe = NULL;
2925 struct ocfs2_xattr_value_root *xv = NULL;
2926 char *base = NULL;
2927 int name_offset, name_len = 0;
2928 u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
2929 xi->xi_value_len);
2930 u64 value_size;
2931
2932 /*
2933 * Calculate the clusters we need to write.
2934 * No matter whether we replace an old one or add a new one,
2935 * we need this for writing.
2936 */
2937 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE)
2938 credits += new_clusters *
2939 ocfs2_clusters_to_blocks(inode->i_sb, 1);
2940
2941 if (xis->not_found && xbs->not_found) {
2942 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2943
2944 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
2945 clusters_add += new_clusters;
2946 credits += ocfs2_calc_extend_credits(inode->i_sb,
2947 &def_xv.xv.xr_list,
2948 new_clusters);
2949 }
2950
2951 goto meta_guess;
2952 }
2953
2954 if (!xis->not_found) {
2955 xe = xis->here;
2956 name_offset = le16_to_cpu(xe->xe_name_offset);
2957 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
2958 base = xis->base;
2959 credits += OCFS2_INODE_UPDATE_CREDITS;
2960 } else {
2961 int i, block_off = 0;
2962 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
2963 xe = xbs->here;
2964 name_offset = le16_to_cpu(xe->xe_name_offset);
2965 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
2966 i = xbs->here - xbs->header->xh_entries;
2967 old_in_xb = 1;
2968
2969 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
2970 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
2971 bucket_xh(xbs->bucket),
2972 i, &block_off,
2973 &name_offset);
2974 base = bucket_block(xbs->bucket, block_off);
2975 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2976 } else {
2977 base = xbs->base;
2978 credits += OCFS2_XATTR_BLOCK_UPDATE_CREDITS;
2979 }
2980 }
2981
2982 /*
2983 * delete a xattr doesn't need metadata and cluster allocation.
2984 * so just calculate the credits and return.
2985 *
2986 * The credits for removing the value tree will be extended
2987 * by ocfs2_remove_extent itself.
2988 */
2989 if (!xi->xi_value) {
2990 if (!ocfs2_xattr_is_local(xe))
2991 credits += ocfs2_remove_extent_credits(inode->i_sb);
2992
2993 goto out;
2994 }
2995
2996 /* do cluster allocation guess first. */
2997 value_size = le64_to_cpu(xe->xe_value_size);
2998
2999 if (old_in_xb) {
3000 /*
3001 * In xattr set, we always try to set the xe in inode first,
3002 * so if it can be inserted into inode successfully, the old
3003 * one will be removed from the xattr block, and this xattr
3004 * will be inserted into inode as a new xattr in inode.
3005 */
3006 if (ocfs2_xattr_can_be_in_inode(inode, xi, xis)) {
3007 clusters_add += new_clusters;
3008 credits += ocfs2_remove_extent_credits(inode->i_sb) +
3009 OCFS2_INODE_UPDATE_CREDITS;
3010 if (!ocfs2_xattr_is_local(xe))
3011 credits += ocfs2_calc_extend_credits(
3012 inode->i_sb,
3013 &def_xv.xv.xr_list,
3014 new_clusters);
3015 goto out;
3016 }
3017 }
3018
3019 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3020 /* the new values will be stored outside. */
3021 u32 old_clusters = 0;
3022
3023 if (!ocfs2_xattr_is_local(xe)) {
3024 old_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
3025 value_size);
3026 xv = (struct ocfs2_xattr_value_root *)
3027 (base + name_offset + name_len);
3028 value_size = OCFS2_XATTR_ROOT_SIZE;
3029 } else
3030 xv = &def_xv.xv;
3031
3032 if (old_clusters >= new_clusters) {
3033 credits += ocfs2_remove_extent_credits(inode->i_sb);
3034 goto out;
3035 } else {
3036 meta_add += ocfs2_extend_meta_needed(&xv->xr_list);
3037 clusters_add += new_clusters - old_clusters;
3038 credits += ocfs2_calc_extend_credits(inode->i_sb,
3039 &xv->xr_list,
3040 new_clusters -
3041 old_clusters);
3042 if (value_size >= OCFS2_XATTR_ROOT_SIZE)
3043 goto out;
3044 }
3045 } else {
3046 /*
3047 * Now the new value will be stored inside. So if the new
3048 * value is smaller than the size of value root or the old
3049 * value, we don't need any allocation, otherwise we have
3050 * to guess metadata allocation.
3051 */
3052 if ((ocfs2_xattr_is_local(xe) &&
3053 (value_size >= xi->xi_value_len)) ||
3054 (!ocfs2_xattr_is_local(xe) &&
3055 OCFS2_XATTR_ROOT_SIZE >= xi->xi_value_len))
3056 goto out;
3057 }
3058
3059 meta_guess:
3060 /* calculate metadata allocation. */
3061 if (di->i_xattr_loc) {
3062 if (!xbs->xattr_bh) {
3063 ret = ocfs2_read_xattr_block(inode,
3064 le64_to_cpu(di->i_xattr_loc),
3065 &bh);
3066 if (ret) {
3067 mlog_errno(ret);
3068 goto out;
3069 }
3070
3071 xb = (struct ocfs2_xattr_block *)bh->b_data;
3072 } else
3073 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
3074
3075 /*
3076 * If there is already an xattr tree, good, we can calculate
3077 * like other b-trees. Otherwise we may have the chance of
3078 * create a tree, the credit calculation is borrowed from
3079 * ocfs2_calc_extend_credits with root_el = NULL. And the
3080 * new tree will be cluster based, so no meta is needed.
3081 */
3082 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
3083 struct ocfs2_extent_list *el =
3084 &xb->xb_attrs.xb_root.xt_list;
3085 meta_add += ocfs2_extend_meta_needed(el);
3086 credits += ocfs2_calc_extend_credits(inode->i_sb,
3087 el, 1);
3088 } else
3089 credits += OCFS2_SUBALLOC_ALLOC + 1;
3090
3091 /*
3092 * This cluster will be used either for new bucket or for
3093 * new xattr block.
3094 * If the cluster size is the same as the bucket size, one
3095 * more is needed since we may need to extend the bucket
3096 * also.
3097 */
3098 clusters_add += 1;
3099 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3100 if (OCFS2_XATTR_BUCKET_SIZE ==
3101 OCFS2_SB(inode->i_sb)->s_clustersize) {
3102 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3103 clusters_add += 1;
3104 }
3105 } else {
3106 meta_add += 1;
3107 credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
3108 }
3109 out:
3110 if (clusters_need)
3111 *clusters_need = clusters_add;
3112 if (meta_need)
3113 *meta_need = meta_add;
3114 if (credits_need)
3115 *credits_need = credits;
3116 brelse(bh);
3117 return ret;
3118 }
3119
3120 static int ocfs2_init_xattr_set_ctxt(struct inode *inode,
3121 struct ocfs2_dinode *di,
3122 struct ocfs2_xattr_info *xi,
3123 struct ocfs2_xattr_search *xis,
3124 struct ocfs2_xattr_search *xbs,
3125 struct ocfs2_xattr_set_ctxt *ctxt,
3126 int extra_meta,
3127 int *credits)
3128 {
3129 int clusters_add, meta_add, ret;
3130 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3131
3132 memset(ctxt, 0, sizeof(struct ocfs2_xattr_set_ctxt));
3133
3134 ocfs2_init_dealloc_ctxt(&ctxt->dealloc);
3135
3136 ret = ocfs2_calc_xattr_set_need(inode, di, xi, xis, xbs,
3137 &clusters_add, &meta_add, credits);
3138 if (ret) {
3139 mlog_errno(ret);
3140 return ret;
3141 }
3142
3143 meta_add += extra_meta;
3144 mlog(0, "Set xattr %s, reserve meta blocks = %d, clusters = %d, "
3145 "credits = %d\n", xi->xi_name, meta_add, clusters_add, *credits);
3146
3147 if (meta_add) {
3148 ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add,
3149 &ctxt->meta_ac);
3150 if (ret) {
3151 mlog_errno(ret);
3152 goto out;
3153 }
3154 }
3155
3156 if (clusters_add) {
3157 ret = ocfs2_reserve_clusters(osb, clusters_add, &ctxt->data_ac);
3158 if (ret)
3159 mlog_errno(ret);
3160 }
3161 out:
3162 if (ret) {
3163 if (ctxt->meta_ac) {
3164 ocfs2_free_alloc_context(ctxt->meta_ac);
3165 ctxt->meta_ac = NULL;
3166 }
3167
3168 /*
3169 * We cannot have an error and a non null ctxt->data_ac.
3170 */
3171 }
3172
3173 return ret;
3174 }
3175
3176 static int __ocfs2_xattr_set_handle(struct inode *inode,
3177 struct ocfs2_dinode *di,
3178 struct ocfs2_xattr_info *xi,
3179 struct ocfs2_xattr_search *xis,
3180 struct ocfs2_xattr_search *xbs,
3181 struct ocfs2_xattr_set_ctxt *ctxt)
3182 {
3183 int ret = 0, credits, old_found;
3184
3185 if (!xi->xi_value) {
3186 /* Remove existing extended attribute */
3187 if (!xis->not_found)
3188 ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
3189 else if (!xbs->not_found)
3190 ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3191 } else {
3192 /* We always try to set extended attribute into inode first*/
3193 ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
3194 if (!ret && !xbs->not_found) {
3195 /*
3196 * If succeed and that extended attribute existing in
3197 * external block, then we will remove it.
3198 */
3199 xi->xi_value = NULL;
3200 xi->xi_value_len = 0;
3201
3202 old_found = xis->not_found;
3203 xis->not_found = -ENODATA;
3204 ret = ocfs2_calc_xattr_set_need(inode,
3205 di,
3206 xi,
3207 xis,
3208 xbs,
3209 NULL,
3210 NULL,
3211 &credits);
3212 xis->not_found = old_found;
3213 if (ret) {
3214 mlog_errno(ret);
3215 goto out;
3216 }
3217
3218 ret = ocfs2_extend_trans(ctxt->handle, credits +
3219 ctxt->handle->h_buffer_credits);
3220 if (ret) {
3221 mlog_errno(ret);
3222 goto out;
3223 }
3224 ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3225 } else if (ret == -ENOSPC) {
3226 if (di->i_xattr_loc && !xbs->xattr_bh) {
3227 ret = ocfs2_xattr_block_find(inode,
3228 xi->xi_name_index,
3229 xi->xi_name, xbs);
3230 if (ret)
3231 goto out;
3232
3233 old_found = xis->not_found;
3234 xis->not_found = -ENODATA;
3235 ret = ocfs2_calc_xattr_set_need(inode,
3236 di,
3237 xi,
3238 xis,
3239 xbs,
3240 NULL,
3241 NULL,
3242 &credits);
3243 xis->not_found = old_found;
3244 if (ret) {
3245 mlog_errno(ret);
3246 goto out;
3247 }
3248
3249 ret = ocfs2_extend_trans(ctxt->handle, credits +
3250 ctxt->handle->h_buffer_credits);
3251 if (ret) {
3252 mlog_errno(ret);
3253 goto out;
3254 }
3255 }
3256 /*
3257 * If no space in inode, we will set extended attribute
3258 * into external block.
3259 */
3260 ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3261 if (ret)
3262 goto out;
3263 if (!xis->not_found) {
3264 /*
3265 * If succeed and that extended attribute
3266 * existing in inode, we will remove it.
3267 */
3268 xi->xi_value = NULL;
3269 xi->xi_value_len = 0;
3270 xbs->not_found = -ENODATA;
3271 ret = ocfs2_calc_xattr_set_need(inode,
3272 di,
3273 xi,
3274 xis,
3275 xbs,
3276 NULL,
3277 NULL,
3278 &credits);
3279 if (ret) {
3280 mlog_errno(ret);
3281 goto out;
3282 }
3283
3284 ret = ocfs2_extend_trans(ctxt->handle, credits +
3285 ctxt->handle->h_buffer_credits);
3286 if (ret) {
3287 mlog_errno(ret);
3288 goto out;
3289 }
3290 ret = ocfs2_xattr_ibody_set(inode, xi,
3291 xis, ctxt);
3292 }
3293 }
3294 }
3295
3296 if (!ret) {
3297 /* Update inode ctime. */
3298 ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
3299 xis->inode_bh,
3300 OCFS2_JOURNAL_ACCESS_WRITE);
3301 if (ret) {
3302 mlog_errno(ret);
3303 goto out;
3304 }
3305
3306 inode->i_ctime = CURRENT_TIME;
3307 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
3308 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
3309 ocfs2_journal_dirty(ctxt->handle, xis->inode_bh);
3310 }
3311 out:
3312 return ret;
3313 }
3314
3315 /*
3316 * This function only called duing creating inode
3317 * for init security/acl xattrs of the new inode.
3318 * All transanction credits have been reserved in mknod.
3319 */
3320 int ocfs2_xattr_set_handle(handle_t *handle,
3321 struct inode *inode,
3322 struct buffer_head *di_bh,
3323 int name_index,
3324 const char *name,
3325 const void *value,
3326 size_t value_len,
3327 int flags,
3328 struct ocfs2_alloc_context *meta_ac,
3329 struct ocfs2_alloc_context *data_ac)
3330 {
3331 struct ocfs2_dinode *di;
3332 int ret;
3333
3334 struct ocfs2_xattr_info xi = {
3335 .xi_name_index = name_index,
3336 .xi_name = name,
3337 .xi_name_len = strlen(name),
3338 .xi_value = value,
3339 .xi_value_len = value_len,
3340 };
3341
3342 struct ocfs2_xattr_search xis = {
3343 .not_found = -ENODATA,
3344 };
3345
3346 struct ocfs2_xattr_search xbs = {
3347 .not_found = -ENODATA,
3348 };
3349
3350 struct ocfs2_xattr_set_ctxt ctxt = {
3351 .handle = handle,
3352 .meta_ac = meta_ac,
3353 .data_ac = data_ac,
3354 };
3355
3356 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
3357 return -EOPNOTSUPP;
3358
3359 /*
3360 * In extreme situation, may need xattr bucket when
3361 * block size is too small. And we have already reserved
3362 * the credits for bucket in mknod.
3363 */
3364 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) {
3365 xbs.bucket = ocfs2_xattr_bucket_new(inode);
3366 if (!xbs.bucket) {
3367 mlog_errno(-ENOMEM);
3368 return -ENOMEM;
3369 }
3370 }
3371
3372 xis.inode_bh = xbs.inode_bh = di_bh;
3373 di = (struct ocfs2_dinode *)di_bh->b_data;
3374
3375 down_write(&OCFS2_I(inode)->ip_xattr_sem);
3376
3377 ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
3378 if (ret)
3379 goto cleanup;
3380 if (xis.not_found) {
3381 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
3382 if (ret)
3383 goto cleanup;
3384 }
3385
3386 ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
3387
3388 cleanup:
3389 up_write(&OCFS2_I(inode)->ip_xattr_sem);
3390 brelse(xbs.xattr_bh);
3391 ocfs2_xattr_bucket_free(xbs.bucket);
3392
3393 return ret;
3394 }
3395
3396 /*
3397 * ocfs2_xattr_set()
3398 *
3399 * Set, replace or remove an extended attribute for this inode.
3400 * value is NULL to remove an existing extended attribute, else either
3401 * create or replace an extended attribute.
3402 */
3403 int ocfs2_xattr_set(struct inode *inode,
3404 int name_index,
3405 const char *name,
3406 const void *value,
3407 size_t value_len,
3408 int flags)
3409 {
3410 struct buffer_head *di_bh = NULL;
3411 struct ocfs2_dinode *di;
3412 int ret, credits, ref_meta = 0, ref_credits = 0;
3413 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3414 struct inode *tl_inode = osb->osb_tl_inode;
3415 struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
3416 struct ocfs2_refcount_tree *ref_tree = NULL;
3417
3418 struct ocfs2_xattr_info xi = {
3419 .xi_name_index = name_index,
3420 .xi_name = name,
3421 .xi_name_len = strlen(name),
3422 .xi_value = value,
3423 .xi_value_len = value_len,
3424 };
3425
3426 struct ocfs2_xattr_search xis = {
3427 .not_found = -ENODATA,
3428 };
3429
3430 struct ocfs2_xattr_search xbs = {
3431 .not_found = -ENODATA,
3432 };
3433
3434 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
3435 return -EOPNOTSUPP;
3436
3437 /*
3438 * Only xbs will be used on indexed trees. xis doesn't need a
3439 * bucket.
3440 */
3441 xbs.bucket = ocfs2_xattr_bucket_new(inode);
3442 if (!xbs.bucket) {
3443 mlog_errno(-ENOMEM);
3444 return -ENOMEM;
3445 }
3446
3447 ret = ocfs2_inode_lock(inode, &di_bh, 1);
3448 if (ret < 0) {
3449 mlog_errno(ret);
3450 goto cleanup_nolock;
3451 }
3452 xis.inode_bh = xbs.inode_bh = di_bh;
3453 di = (struct ocfs2_dinode *)di_bh->b_data;
3454
3455 down_write(&OCFS2_I(inode)->ip_xattr_sem);
3456 /*
3457 * Scan inode and external block to find the same name
3458 * extended attribute and collect search infomation.
3459 */
3460 ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
3461 if (ret)
3462 goto cleanup;
3463 if (xis.not_found) {
3464 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
3465 if (ret)
3466 goto cleanup;
3467 }
3468
3469 if (xis.not_found && xbs.not_found) {
3470 ret = -ENODATA;
3471 if (flags & XATTR_REPLACE)
3472 goto cleanup;
3473 ret = 0;
3474 if (!value)
3475 goto cleanup;
3476 } else {
3477 ret = -EEXIST;
3478 if (flags & XATTR_CREATE)
3479 goto cleanup;
3480 }
3481
3482 /* Check whether the value is refcounted and do some prepartion. */
3483 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL &&
3484 (!xis.not_found || !xbs.not_found)) {
3485 ret = ocfs2_prepare_refcount_xattr(inode, di, &xi,
3486 &xis, &xbs, &ref_tree,
3487 &ref_meta, &ref_credits);
3488 if (ret) {
3489 mlog_errno(ret);
3490 goto cleanup;
3491 }
3492 }
3493
3494 mutex_lock(&tl_inode->i_mutex);
3495
3496 if (ocfs2_truncate_log_needs_flush(osb)) {
3497 ret = __ocfs2_flush_truncate_log(osb);
3498 if (ret < 0) {
3499 mutex_unlock(&tl_inode->i_mutex);
3500 mlog_errno(ret);
3501 goto cleanup;
3502 }
3503 }
3504 mutex_unlock(&tl_inode->i_mutex);
3505
3506 ret = ocfs2_init_xattr_set_ctxt(inode, di, &xi, &xis,
3507 &xbs, &ctxt, ref_meta, &credits);
3508 if (ret) {
3509 mlog_errno(ret);
3510 goto cleanup;
3511 }
3512
3513 /* we need to update inode's ctime field, so add credit for it. */
3514 credits += OCFS2_INODE_UPDATE_CREDITS;
3515 ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
3516 if (IS_ERR(ctxt.handle)) {
3517 ret = PTR_ERR(ctxt.handle);
3518 mlog_errno(ret);
3519 goto cleanup;
3520 }
3521
3522 ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
3523
3524 ocfs2_commit_trans(osb, ctxt.handle);
3525
3526 if (ctxt.data_ac)
3527 ocfs2_free_alloc_context(ctxt.data_ac);
3528 if (ctxt.meta_ac)
3529 ocfs2_free_alloc_context(ctxt.meta_ac);
3530 if (ocfs2_dealloc_has_cluster(&ctxt.dealloc))
3531 ocfs2_schedule_truncate_log_flush(osb, 1);
3532 ocfs2_run_deallocs(osb, &ctxt.dealloc);
3533
3534 cleanup:
3535 if (ref_tree)
3536 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3537 up_write(&OCFS2_I(inode)->ip_xattr_sem);
3538 if (!value && !ret) {
3539 ret = ocfs2_try_remove_refcount_tree(inode, di_bh);
3540 if (ret)
3541 mlog_errno(ret);
3542 }
3543 ocfs2_inode_unlock(inode, 1);
3544 cleanup_nolock:
3545 brelse(di_bh);
3546 brelse(xbs.xattr_bh);
3547 ocfs2_xattr_bucket_free(xbs.bucket);
3548
3549 return ret;
3550 }
3551
3552 /*
3553 * Find the xattr extent rec which may contains name_hash.
3554 * e_cpos will be the first name hash of the xattr rec.
3555 * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
3556 */
3557 static int ocfs2_xattr_get_rec(struct inode *inode,
3558 u32 name_hash,
3559 u64 *p_blkno,
3560 u32 *e_cpos,
3561 u32 *num_clusters,
3562 struct ocfs2_extent_list *el)
3563 {
3564 int ret = 0, i;
3565 struct buffer_head *eb_bh = NULL;
3566 struct ocfs2_extent_block *eb;
3567 struct ocfs2_extent_rec *rec = NULL;
3568 u64 e_blkno = 0;
3569
3570 if (el->l_tree_depth) {
3571 ret = ocfs2_find_leaf(INODE_CACHE(inode), el, name_hash,
3572 &eb_bh);
3573 if (ret) {
3574 mlog_errno(ret);
3575 goto out;
3576 }
3577
3578 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
3579 el = &eb->h_list;
3580
3581 if (el->l_tree_depth) {
3582 ocfs2_error(inode->i_sb,
3583 "Inode %lu has non zero tree depth in "
3584 "xattr tree block %llu\n", inode->i_ino,
3585 (unsigned long long)eb_bh->b_blocknr);
3586 ret = -EROFS;
3587 goto out;
3588 }
3589 }
3590
3591 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
3592 rec = &el->l_recs[i];
3593
3594 if (le32_to_cpu(rec->e_cpos) <= name_hash) {
3595 e_blkno = le64_to_cpu(rec->e_blkno);
3596 break;
3597 }
3598 }
3599
3600 if (!e_blkno) {
3601 ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
3602 "record (%u, %u, 0) in xattr", inode->i_ino,
3603 le32_to_cpu(rec->e_cpos),
3604 ocfs2_rec_clusters(el, rec));
3605 ret = -EROFS;
3606 goto out;
3607 }
3608
3609 *p_blkno = le64_to_cpu(rec->e_blkno);
3610 *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
3611 if (e_cpos)
3612 *e_cpos = le32_to_cpu(rec->e_cpos);
3613 out:
3614 brelse(eb_bh);
3615 return ret;
3616 }
3617
3618 typedef int (xattr_bucket_func)(struct inode *inode,
3619 struct ocfs2_xattr_bucket *bucket,
3620 void *para);
3621
3622 static int ocfs2_find_xe_in_bucket(struct inode *inode,
3623 struct ocfs2_xattr_bucket *bucket,
3624 int name_index,
3625 const char *name,
3626 u32 name_hash,
3627 u16 *xe_index,
3628 int *found)
3629 {
3630 int i, ret = 0, cmp = 1, block_off, new_offset;
3631 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
3632 size_t name_len = strlen(name);
3633 struct ocfs2_xattr_entry *xe = NULL;
3634 char *xe_name;
3635
3636 /*
3637 * We don't use binary search in the bucket because there
3638 * may be multiple entries with the same name hash.
3639 */
3640 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3641 xe = &xh->xh_entries[i];
3642
3643 if (name_hash > le32_to_cpu(xe->xe_name_hash))
3644 continue;
3645 else if (name_hash < le32_to_cpu(xe->xe_name_hash))
3646 break;
3647
3648 cmp = name_index - ocfs2_xattr_get_type(xe);
3649 if (!cmp)
3650 cmp = name_len - xe->xe_name_len;
3651 if (cmp)
3652 continue;
3653
3654 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3655 xh,
3656 i,
3657 &block_off,
3658 &new_offset);
3659 if (ret) {
3660 mlog_errno(ret);
3661 break;
3662 }
3663
3664
3665 xe_name = bucket_block(bucket, block_off) + new_offset;
3666 if (!memcmp(name, xe_name, name_len)) {
3667 *xe_index = i;
3668 *found = 1;
3669 ret = 0;
3670 break;
3671 }
3672 }
3673
3674 return ret;
3675 }
3676
3677 /*
3678 * Find the specified xattr entry in a series of buckets.
3679 * This series start from p_blkno and last for num_clusters.
3680 * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
3681 * the num of the valid buckets.
3682 *
3683 * Return the buffer_head this xattr should reside in. And if the xattr's
3684 * hash is in the gap of 2 buckets, return the lower bucket.
3685 */
3686 static int ocfs2_xattr_bucket_find(struct inode *inode,
3687 int name_index,
3688 const char *name,
3689 u32 name_hash,
3690 u64 p_blkno,
3691 u32 first_hash,
3692 u32 num_clusters,
3693 struct ocfs2_xattr_search *xs)
3694 {
3695 int ret, found = 0;
3696 struct ocfs2_xattr_header *xh = NULL;
3697 struct ocfs2_xattr_entry *xe = NULL;
3698 u16 index = 0;
3699 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3700 int low_bucket = 0, bucket, high_bucket;
3701 struct ocfs2_xattr_bucket *search;
3702 u32 last_hash;
3703 u64 blkno, lower_blkno = 0;
3704
3705 search = ocfs2_xattr_bucket_new(inode);
3706 if (!search) {
3707 ret = -ENOMEM;
3708 mlog_errno(ret);
3709 goto out;
3710 }
3711
3712 ret = ocfs2_read_xattr_bucket(search, p_blkno);
3713 if (ret) {
3714 mlog_errno(ret);
3715 goto out;
3716 }
3717
3718 xh = bucket_xh(search);
3719 high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
3720 while (low_bucket <= high_bucket) {
3721 ocfs2_xattr_bucket_relse(search);
3722
3723 bucket = (low_bucket + high_bucket) / 2;
3724 blkno = p_blkno + bucket * blk_per_bucket;
3725 ret = ocfs2_read_xattr_bucket(search, blkno);
3726 if (ret) {
3727 mlog_errno(ret);
3728 goto out;
3729 }
3730
3731 xh = bucket_xh(search);
3732 xe = &xh->xh_entries[0];
3733 if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
3734 high_bucket = bucket - 1;
3735 continue;
3736 }
3737
3738 /*
3739 * Check whether the hash of the last entry in our
3740 * bucket is larger than the search one. for an empty
3741 * bucket, the last one is also the first one.
3742 */
3743 if (xh->xh_count)
3744 xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
3745
3746 last_hash = le32_to_cpu(xe->xe_name_hash);
3747
3748 /* record lower_blkno which may be the insert place. */
3749 lower_blkno = blkno;
3750
3751 if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
3752 low_bucket = bucket + 1;
3753 continue;
3754 }
3755
3756 /* the searched xattr should reside in this bucket if exists. */
3757 ret = ocfs2_find_xe_in_bucket(inode, search,
3758 name_index, name, name_hash,
3759 &index, &found);
3760 if (ret) {
3761 mlog_errno(ret);
3762 goto out;
3763 }
3764 break;
3765 }
3766
3767 /*
3768 * Record the bucket we have found.
3769 * When the xattr's hash value is in the gap of 2 buckets, we will
3770 * always set it to the previous bucket.
3771 */
3772 if (!lower_blkno)
3773 lower_blkno = p_blkno;
3774
3775 /* This should be in cache - we just read it during the search */
3776 ret = ocfs2_read_xattr_bucket(xs->bucket, lower_blkno);
3777 if (ret) {
3778 mlog_errno(ret);
3779 goto out;
3780 }
3781
3782 xs->header = bucket_xh(xs->bucket);
3783 xs->base = bucket_block(xs->bucket, 0);
3784 xs->end = xs->base + inode->i_sb->s_blocksize;
3785
3786 if (found) {
3787 xs->here = &xs->header->xh_entries[index];
3788 mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name,
3789 (unsigned long long)bucket_blkno(xs->bucket), index);
3790 } else
3791 ret = -ENODATA;
3792
3793 out:
3794 ocfs2_xattr_bucket_free(search);
3795 return ret;
3796 }
3797
3798 static int ocfs2_xattr_index_block_find(struct inode *inode,
3799 struct buffer_head *root_bh,
3800 int name_index,
3801 const char *name,
3802 struct ocfs2_xattr_search *xs)
3803 {
3804 int ret;
3805 struct ocfs2_xattr_block *xb =
3806 (struct ocfs2_xattr_block *)root_bh->b_data;
3807 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3808 struct ocfs2_extent_list *el = &xb_root->xt_list;
3809 u64 p_blkno = 0;
3810 u32 first_hash, num_clusters = 0;
3811 u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
3812
3813 if (le16_to_cpu(el->l_next_free_rec) == 0)
3814 return -ENODATA;
3815
3816 mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n",
3817 name, name_hash, name_index);
3818
3819 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
3820 &num_clusters, el);
3821 if (ret) {
3822 mlog_errno(ret);
3823 goto out;
3824 }
3825
3826 BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
3827
3828 mlog(0, "find xattr extent rec %u clusters from %llu, the first hash "
3829 "in the rec is %u\n", num_clusters, (unsigned long long)p_blkno,
3830 first_hash);
3831
3832 ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
3833 p_blkno, first_hash, num_clusters, xs);
3834
3835 out:
3836 return ret;
3837 }
3838
3839 static int ocfs2_iterate_xattr_buckets(struct inode *inode,
3840 u64 blkno,
3841 u32 clusters,
3842 xattr_bucket_func *func,
3843 void *para)
3844 {
3845 int i, ret = 0;
3846 u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
3847 u32 num_buckets = clusters * bpc;
3848 struct ocfs2_xattr_bucket *bucket;
3849
3850 bucket = ocfs2_xattr_bucket_new(inode);
3851 if (!bucket) {
3852 mlog_errno(-ENOMEM);
3853 return -ENOMEM;
3854 }
3855
3856 mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n",
3857 clusters, (unsigned long long)blkno);
3858
3859 for (i = 0; i < num_buckets; i++, blkno += bucket->bu_blocks) {
3860 ret = ocfs2_read_xattr_bucket(bucket, blkno);
3861 if (ret) {
3862 mlog_errno(ret);
3863 break;
3864 }
3865
3866 /*
3867 * The real bucket num in this series of blocks is stored
3868 * in the 1st bucket.
3869 */
3870 if (i == 0)
3871 num_buckets = le16_to_cpu(bucket_xh(bucket)->xh_num_buckets);
3872
3873 mlog(0, "iterating xattr bucket %llu, first hash %u\n",
3874 (unsigned long long)blkno,
3875 le32_to_cpu(bucket_xh(bucket)->xh_entries[0].xe_name_hash));
3876 if (func) {
3877 ret = func(inode, bucket, para);
3878 if (ret && ret != -ERANGE)
3879 mlog_errno(ret);
3880 /* Fall through to bucket_relse() */
3881 }
3882
3883 ocfs2_xattr_bucket_relse(bucket);
3884 if (ret)
3885 break;
3886 }
3887
3888 ocfs2_xattr_bucket_free(bucket);
3889 return ret;
3890 }
3891
3892 struct ocfs2_xattr_tree_list {
3893 char *buffer;
3894 size_t buffer_size;
3895 size_t result;
3896 };
3897
3898 static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
3899 struct ocfs2_xattr_header *xh,
3900 int index,
3901 int *block_off,
3902 int *new_offset)
3903 {
3904 u16 name_offset;
3905
3906 if (index < 0 || index >= le16_to_cpu(xh->xh_count))
3907 return -EINVAL;
3908
3909 name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
3910
3911 *block_off = name_offset >> sb->s_blocksize_bits;
3912 *new_offset = name_offset % sb->s_blocksize;
3913
3914 return 0;
3915 }
3916
3917 static int ocfs2_list_xattr_bucket(struct inode *inode,
3918 struct ocfs2_xattr_bucket *bucket,
3919 void *para)
3920 {
3921 int ret = 0, type;
3922 struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
3923 int i, block_off, new_offset;
3924 const char *prefix, *name;
3925
3926 for (i = 0 ; i < le16_to_cpu(bucket_xh(bucket)->xh_count); i++) {
3927 struct ocfs2_xattr_entry *entry = &bucket_xh(bucket)->xh_entries[i];
3928 type = ocfs2_xattr_get_type(entry);
3929 prefix = ocfs2_xattr_prefix(type);
3930
3931 if (prefix) {
3932 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3933 bucket_xh(bucket),
3934 i,
3935 &block_off,
3936 &new_offset);
3937 if (ret)
3938 break;
3939
3940 name = (const char *)bucket_block(bucket, block_off) +
3941 new_offset;
3942 ret = ocfs2_xattr_list_entry(xl->buffer,
3943 xl->buffer_size,
3944 &xl->result,
3945 prefix, name,
3946 entry->xe_name_len);
3947 if (ret)
3948 break;
3949 }
3950 }
3951
3952 return ret;
3953 }
3954
3955 static int ocfs2_iterate_xattr_index_block(struct inode *inode,
3956 struct buffer_head *blk_bh,
3957 xattr_tree_rec_func *rec_func,
3958 void *para)
3959 {
3960 struct ocfs2_xattr_block *xb =
3961 (struct ocfs2_xattr_block *)blk_bh->b_data;
3962 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
3963 int ret = 0;
3964 u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
3965 u64 p_blkno = 0;
3966
3967 if (!el->l_next_free_rec || !rec_func)
3968 return 0;
3969
3970 while (name_hash > 0) {
3971 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
3972 &e_cpos, &num_clusters, el);
3973 if (ret) {
3974 mlog_errno(ret);
3975 break;
3976 }
3977
3978 ret = rec_func(inode, blk_bh, p_blkno, e_cpos,
3979 num_clusters, para);
3980 if (ret) {
3981 if (ret != -ERANGE)
3982 mlog_errno(ret);
3983 break;
3984 }
3985
3986 if (e_cpos == 0)
3987 break;
3988
3989 name_hash = e_cpos - 1;
3990 }
3991
3992 return ret;
3993
3994 }
3995
3996 static int ocfs2_list_xattr_tree_rec(struct inode *inode,
3997 struct buffer_head *root_bh,
3998 u64 blkno, u32 cpos, u32 len, void *para)
3999 {
4000 return ocfs2_iterate_xattr_buckets(inode, blkno, len,
4001 ocfs2_list_xattr_bucket, para);
4002 }
4003
4004 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
4005 struct buffer_head *blk_bh,
4006 char *buffer,
4007 size_t buffer_size)
4008 {
4009 int ret;
4010 struct ocfs2_xattr_tree_list xl = {
4011 .buffer = buffer,
4012 .buffer_size = buffer_size,
4013 .result = 0,
4014 };
4015
4016 ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
4017 ocfs2_list_xattr_tree_rec, &xl);
4018 if (ret) {
4019 mlog_errno(ret);
4020 goto out;
4021 }
4022
4023 ret = xl.result;
4024 out:
4025 return ret;
4026 }
4027
4028 static int cmp_xe(const void *a, const void *b)
4029 {
4030 const struct ocfs2_xattr_entry *l = a, *r = b;
4031 u32 l_hash = le32_to_cpu(l->xe_name_hash);
4032 u32 r_hash = le32_to_cpu(r->xe_name_hash);
4033
4034 if (l_hash > r_hash)
4035 return 1;
4036 if (l_hash < r_hash)
4037 return -1;
4038 return 0;
4039 }
4040
4041 static void swap_xe(void *a, void *b, int size)
4042 {
4043 struct ocfs2_xattr_entry *l = a, *r = b, tmp;
4044
4045 tmp = *l;
4046 memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
4047 memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
4048 }
4049
4050 /*
4051 * When the ocfs2_xattr_block is filled up, new bucket will be created
4052 * and all the xattr entries will be moved to the new bucket.
4053 * The header goes at the start of the bucket, and the names+values are
4054 * filled from the end. This is why *target starts as the last buffer.
4055 * Note: we need to sort the entries since they are not saved in order
4056 * in the ocfs2_xattr_block.
4057 */
4058 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
4059 struct buffer_head *xb_bh,
4060 struct ocfs2_xattr_bucket *bucket)
4061 {
4062 int i, blocksize = inode->i_sb->s_blocksize;
4063 int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4064 u16 offset, size, off_change;
4065 struct ocfs2_xattr_entry *xe;
4066 struct ocfs2_xattr_block *xb =
4067 (struct ocfs2_xattr_block *)xb_bh->b_data;
4068 struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
4069 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
4070 u16 count = le16_to_cpu(xb_xh->xh_count);
4071 char *src = xb_bh->b_data;
4072 char *target = bucket_block(bucket, blks - 1);
4073
4074 mlog(0, "cp xattr from block %llu to bucket %llu\n",
4075 (unsigned long long)xb_bh->b_blocknr,
4076 (unsigned long long)bucket_blkno(bucket));
4077
4078 for (i = 0; i < blks; i++)
4079 memset(bucket_block(bucket, i), 0, blocksize);
4080
4081 /*
4082 * Since the xe_name_offset is based on ocfs2_xattr_header,
4083 * there is a offset change corresponding to the change of
4084 * ocfs2_xattr_header's position.
4085 */
4086 off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
4087 xe = &xb_xh->xh_entries[count - 1];
4088 offset = le16_to_cpu(xe->xe_name_offset) + off_change;
4089 size = blocksize - offset;
4090
4091 /* copy all the names and values. */
4092 memcpy(target + offset, src + offset, size);
4093
4094 /* Init new header now. */
4095 xh->xh_count = xb_xh->xh_count;
4096 xh->xh_num_buckets = cpu_to_le16(1);
4097 xh->xh_name_value_len = cpu_to_le16(size);
4098 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
4099
4100 /* copy all the entries. */
4101 target = bucket_block(bucket, 0);
4102 offset = offsetof(struct ocfs2_xattr_header, xh_entries);
4103 size = count * sizeof(struct ocfs2_xattr_entry);
4104 memcpy(target + offset, (char *)xb_xh + offset, size);
4105
4106 /* Change the xe offset for all the xe because of the move. */
4107 off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
4108 offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
4109 for (i = 0; i < count; i++)
4110 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
4111
4112 mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n",
4113 offset, size, off_change);
4114
4115 sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
4116 cmp_xe, swap_xe);
4117 }
4118
4119 /*
4120 * After we move xattr from block to index btree, we have to
4121 * update ocfs2_xattr_search to the new xe and base.
4122 *
4123 * When the entry is in xattr block, xattr_bh indicates the storage place.
4124 * While if the entry is in index b-tree, "bucket" indicates the
4125 * real place of the xattr.
4126 */
4127 static void ocfs2_xattr_update_xattr_search(struct inode *inode,
4128 struct ocfs2_xattr_search *xs,
4129 struct buffer_head *old_bh)
4130 {
4131 char *buf = old_bh->b_data;
4132 struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
4133 struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
4134 int i;
4135
4136 xs->header = bucket_xh(xs->bucket);
4137 xs->base = bucket_block(xs->bucket, 0);
4138 xs->end = xs->base + inode->i_sb->s_blocksize;
4139
4140 if (xs->not_found)
4141 return;
4142
4143 i = xs->here - old_xh->xh_entries;
4144 xs->here = &xs->header->xh_entries[i];
4145 }
4146
4147 static int ocfs2_xattr_create_index_block(struct inode *inode,
4148 struct ocfs2_xattr_search *xs,
4149 struct ocfs2_xattr_set_ctxt *ctxt)
4150 {
4151 int ret;
4152 u32 bit_off, len;
4153 u64 blkno;
4154 handle_t *handle = ctxt->handle;
4155 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4156 struct ocfs2_inode_info *oi = OCFS2_I(inode);
4157 struct buffer_head *xb_bh = xs->xattr_bh;
4158 struct ocfs2_xattr_block *xb =
4159 (struct ocfs2_xattr_block *)xb_bh->b_data;
4160 struct ocfs2_xattr_tree_root *xr;
4161 u16 xb_flags = le16_to_cpu(xb->xb_flags);
4162
4163 mlog(0, "create xattr index block for %llu\n",
4164 (unsigned long long)xb_bh->b_blocknr);
4165
4166 BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
4167 BUG_ON(!xs->bucket);
4168
4169 /*
4170 * XXX:
4171 * We can use this lock for now, and maybe move to a dedicated mutex
4172 * if performance becomes a problem later.
4173 */
4174 down_write(&oi->ip_alloc_sem);
4175
4176 ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), xb_bh,
4177 OCFS2_JOURNAL_ACCESS_WRITE);
4178 if (ret) {
4179 mlog_errno(ret);
4180 goto out;
4181 }
4182
4183 ret = __ocfs2_claim_clusters(osb, handle, ctxt->data_ac,
4184 1, 1, &bit_off, &len);
4185 if (ret) {
4186 mlog_errno(ret);
4187 goto out;
4188 }
4189
4190 /*
4191 * The bucket may spread in many blocks, and
4192 * we will only touch the 1st block and the last block
4193 * in the whole bucket(one for entry and one for data).
4194 */
4195 blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
4196
4197 mlog(0, "allocate 1 cluster from %llu to xattr block\n",
4198 (unsigned long long)blkno);
4199
4200 ret = ocfs2_init_xattr_bucket(xs->bucket, blkno);
4201 if (ret) {
4202 mlog_errno(ret);
4203 goto out;
4204 }
4205
4206 ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
4207 OCFS2_JOURNAL_ACCESS_CREATE);
4208 if (ret) {
4209 mlog_errno(ret);
4210 goto out;
4211 }
4212
4213 ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xs->bucket);
4214 ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
4215
4216 ocfs2_xattr_update_xattr_search(inode, xs, xb_bh);
4217
4218 /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
4219 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
4220 offsetof(struct ocfs2_xattr_block, xb_attrs));
4221
4222 xr = &xb->xb_attrs.xb_root;
4223 xr->xt_clusters = cpu_to_le32(1);
4224 xr->xt_last_eb_blk = 0;
4225 xr->xt_list.l_tree_depth = 0;
4226 xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
4227 xr->xt_list.l_next_free_rec = cpu_to_le16(1);
4228
4229 xr->xt_list.l_recs[0].e_cpos = 0;
4230 xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
4231 xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
4232
4233 xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
4234
4235 ocfs2_journal_dirty(handle, xb_bh);
4236
4237 out:
4238 up_write(&oi->ip_alloc_sem);
4239
4240 return ret;
4241 }
4242
4243 static int cmp_xe_offset(const void *a, const void *b)
4244 {
4245 const struct ocfs2_xattr_entry *l = a, *r = b;
4246 u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
4247 u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
4248
4249 if (l_name_offset < r_name_offset)
4250 return 1;
4251 if (l_name_offset > r_name_offset)
4252 return -1;
4253 return 0;
4254 }
4255
4256 /*
4257 * defrag a xattr bucket if we find that the bucket has some
4258 * holes beteen name/value pairs.
4259 * We will move all the name/value pairs to the end of the bucket
4260 * so that we can spare some space for insertion.
4261 */
4262 static int ocfs2_defrag_xattr_bucket(struct inode *inode,
4263 handle_t *handle,
4264 struct ocfs2_xattr_bucket *bucket)
4265 {
4266 int ret, i;
4267 size_t end, offset, len;
4268 struct ocfs2_xattr_header *xh;
4269 char *entries, *buf, *bucket_buf = NULL;
4270 u64 blkno = bucket_blkno(bucket);
4271 u16 xh_free_start;
4272 size_t blocksize = inode->i_sb->s_blocksize;
4273 struct ocfs2_xattr_entry *xe;
4274
4275 /*
4276 * In order to make the operation more efficient and generic,
4277 * we copy all the blocks into a contiguous memory and do the
4278 * defragment there, so if anything is error, we will not touch
4279 * the real block.
4280 */
4281 bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
4282 if (!bucket_buf) {
4283 ret = -EIO;
4284 goto out;
4285 }
4286
4287 buf = bucket_buf;
4288 for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
4289 memcpy(buf, bucket_block(bucket, i), blocksize);
4290
4291 ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
4292 OCFS2_JOURNAL_ACCESS_WRITE);
4293 if (ret < 0) {
4294 mlog_errno(ret);
4295 goto out;
4296 }
4297
4298 xh = (struct ocfs2_xattr_header *)bucket_buf;
4299 entries = (char *)xh->xh_entries;
4300 xh_free_start = le16_to_cpu(xh->xh_free_start);
4301
4302 mlog(0, "adjust xattr bucket in %llu, count = %u, "
4303 "xh_free_start = %u, xh_name_value_len = %u.\n",
4304 (unsigned long long)blkno, le16_to_cpu(xh->xh_count),
4305 xh_free_start, le16_to_cpu(xh->xh_name_value_len));
4306
4307 /*
4308 * sort all the entries by their offset.
4309 * the largest will be the first, so that we can
4310 * move them to the end one by one.
4311 */
4312 sort(entries, le16_to_cpu(xh->xh_count),
4313 sizeof(struct ocfs2_xattr_entry),
4314 cmp_xe_offset, swap_xe);
4315
4316 /* Move all name/values to the end of the bucket. */
4317 xe = xh->xh_entries;
4318 end = OCFS2_XATTR_BUCKET_SIZE;
4319 for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
4320 offset = le16_to_cpu(xe->xe_name_offset);
4321 len = namevalue_size_xe(xe);
4322
4323 /*
4324 * We must make sure that the name/value pair
4325 * exist in the same block. So adjust end to
4326 * the previous block end if needed.
4327 */
4328 if (((end - len) / blocksize !=
4329 (end - 1) / blocksize))
4330 end = end - end % blocksize;
4331
4332 if (end > offset + len) {
4333 memmove(bucket_buf + end - len,
4334 bucket_buf + offset, len);
4335 xe->xe_name_offset = cpu_to_le16(end - len);
4336 }
4337
4338 mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
4339 "bucket %llu\n", (unsigned long long)blkno);
4340
4341 end -= len;
4342 }
4343
4344 mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
4345 "bucket %llu\n", (unsigned long long)blkno);
4346
4347 if (xh_free_start == end)
4348 goto out;
4349
4350 memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
4351 xh->xh_free_start = cpu_to_le16(end);
4352
4353 /* sort the entries by their name_hash. */
4354 sort(entries, le16_to_cpu(xh->xh_count),
4355 sizeof(struct ocfs2_xattr_entry),
4356 cmp_xe, swap_xe);
4357
4358 buf = bucket_buf;
4359 for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
4360 memcpy(bucket_block(bucket, i), buf, blocksize);
4361 ocfs2_xattr_bucket_journal_dirty(handle, bucket);
4362
4363 out:
4364 kfree(bucket_buf);
4365 return ret;
4366 }
4367
4368 /*
4369 * prev_blkno points to the start of an existing extent. new_blkno
4370 * points to a newly allocated extent. Because we know each of our
4371 * clusters contains more than bucket, we can easily split one cluster
4372 * at a bucket boundary. So we take the last cluster of the existing
4373 * extent and split it down the middle. We move the last half of the
4374 * buckets in the last cluster of the existing extent over to the new
4375 * extent.
4376 *
4377 * first_bh is the buffer at prev_blkno so we can update the existing
4378 * extent's bucket count. header_bh is the bucket were we were hoping
4379 * to insert our xattr. If the bucket move places the target in the new
4380 * extent, we'll update first_bh and header_bh after modifying the old
4381 * extent.
4382 *
4383 * first_hash will be set as the 1st xe's name_hash in the new extent.
4384 */
4385 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
4386 handle_t *handle,
4387 struct ocfs2_xattr_bucket *first,
4388 struct ocfs2_xattr_bucket *target,
4389 u64 new_blkno,
4390 u32 num_clusters,
4391 u32 *first_hash)
4392 {
4393 int ret;
4394 struct super_block *sb = inode->i_sb;
4395 int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(sb);
4396 int num_buckets = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(sb));
4397 int to_move = num_buckets / 2;
4398 u64 src_blkno;
4399 u64 last_cluster_blkno = bucket_blkno(first) +
4400 ((num_clusters - 1) * ocfs2_clusters_to_blocks(sb, 1));
4401
4402 BUG_ON(le16_to_cpu(bucket_xh(first)->xh_num_buckets) < num_buckets);
4403 BUG_ON(OCFS2_XATTR_BUCKET_SIZE == OCFS2_SB(sb)->s_clustersize);
4404
4405 mlog(0, "move half of xattrs in cluster %llu to %llu\n",
4406 (unsigned long long)last_cluster_blkno, (unsigned long long)new_blkno);
4407
4408 ret = ocfs2_mv_xattr_buckets(inode, handle, bucket_blkno(first),
4409 last_cluster_blkno, new_blkno,
4410 to_move, first_hash);
4411 if (ret) {
4412 mlog_errno(ret);
4413 goto out;
4414 }
4415
4416 /* This is the first bucket that got moved */
4417 src_blkno = last_cluster_blkno + (to_move * blks_per_bucket);
4418
4419 /*
4420 * If the target bucket was part of the moved buckets, we need to
4421 * update first and target.
4422 */
4423 if (bucket_blkno(target) >= src_blkno) {
4424 /* Find the block for the new target bucket */
4425 src_blkno = new_blkno +
4426 (bucket_blkno(target) - src_blkno);
4427
4428 ocfs2_xattr_bucket_relse(first);
4429 ocfs2_xattr_bucket_relse(target);
4430
4431 /*
4432 * These shouldn't fail - the buffers are in the
4433 * journal from ocfs2_cp_xattr_bucket().
4434 */
4435 ret = ocfs2_read_xattr_bucket(first, new_blkno);
4436 if (ret) {
4437 mlog_errno(ret);
4438 goto out;
4439 }
4440 ret = ocfs2_read_xattr_bucket(target, src_blkno);
4441 if (ret)
4442 mlog_errno(ret);
4443
4444 }
4445
4446 out:
4447 return ret;
4448 }
4449
4450 /*
4451 * Find the suitable pos when we divide a bucket into 2.
4452 * We have to make sure the xattrs with the same hash value exist
4453 * in the same bucket.
4454 *
4455 * If this ocfs2_xattr_header covers more than one hash value, find a
4456 * place where the hash value changes. Try to find the most even split.
4457 * The most common case is that all entries have different hash values,
4458 * and the first check we make will find a place to split.
4459 */
4460 static int ocfs2_xattr_find_divide_pos(struct ocfs2_xattr_header *xh)
4461 {
4462 struct ocfs2_xattr_entry *entries = xh->xh_entries;
4463 int count = le16_to_cpu(xh->xh_count);
4464 int delta, middle = count / 2;
4465
4466 /*
4467 * We start at the middle. Each step gets farther away in both
4468 * directions. We therefore hit the change in hash value
4469 * nearest to the middle. Note that this loop does not execute for
4470 * count < 2.
4471 */
4472 for (delta = 0; delta < middle; delta++) {
4473 /* Let's check delta earlier than middle */
4474 if (cmp_xe(&entries[middle - delta - 1],
4475 &entries[middle - delta]))
4476 return middle - delta;
4477
4478 /* For even counts, don't walk off the end */
4479 if ((middle + delta + 1) == count)
4480 continue;
4481
4482 /* Now try delta past middle */
4483 if (cmp_xe(&entries[middle + delta],
4484 &entries[middle + delta + 1]))
4485 return middle + delta + 1;
4486 }
4487
4488 /* Every entry had the same hash */
4489 return count;
4490 }
4491
4492 /*
4493 * Move some xattrs in old bucket(blk) to new bucket(new_blk).
4494 * first_hash will record the 1st hash of the new bucket.
4495 *
4496 * Normally half of the xattrs will be moved. But we have to make
4497 * sure that the xattrs with the same hash value are stored in the
4498 * same bucket. If all the xattrs in this bucket have the same hash
4499 * value, the new bucket will be initialized as an empty one and the
4500 * first_hash will be initialized as (hash_value+1).
4501 */
4502 static int ocfs2_divide_xattr_bucket(struct inode *inode,
4503 handle_t *handle,
4504 u64 blk,
4505 u64 new_blk,
4506 u32 *first_hash,
4507 int new_bucket_head)
4508 {
4509 int ret, i;
4510 int count, start, len, name_value_len = 0, name_offset = 0;
4511 struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
4512 struct ocfs2_xattr_header *xh;
4513 struct ocfs2_xattr_entry *xe;
4514 int blocksize = inode->i_sb->s_blocksize;
4515
4516 mlog(0, "move some of xattrs from bucket %llu to %llu\n",
4517 (unsigned long long)blk, (unsigned long long)new_blk);
4518
4519 s_bucket = ocfs2_xattr_bucket_new(inode);
4520 t_bucket = ocfs2_xattr_bucket_new(inode);
4521 if (!s_bucket || !t_bucket) {
4522 ret = -ENOMEM;
4523 mlog_errno(ret);
4524 goto out;
4525 }
4526
4527 ret = ocfs2_read_xattr_bucket(s_bucket, blk);
4528 if (ret) {
4529 mlog_errno(ret);
4530 goto out;
4531 }
4532
4533 ret = ocfs2_xattr_bucket_journal_access(handle, s_bucket,
4534 OCFS2_JOURNAL_ACCESS_WRITE);
4535 if (ret) {
4536 mlog_errno(ret);
4537 goto out;
4538 }
4539
4540 /*
4541 * Even if !new_bucket_head, we're overwriting t_bucket. Thus,
4542 * there's no need to read it.
4543 */
4544 ret = ocfs2_init_xattr_bucket(t_bucket, new_blk);
4545 if (ret) {
4546 mlog_errno(ret);
4547 goto out;
4548 }
4549
4550 /*
4551 * Hey, if we're overwriting t_bucket, what difference does
4552 * ACCESS_CREATE vs ACCESS_WRITE make? See the comment in the
4553 * same part of ocfs2_cp_xattr_bucket().
4554 */
4555 ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4556 new_bucket_head ?
4557 OCFS2_JOURNAL_ACCESS_CREATE :
4558 OCFS2_JOURNAL_ACCESS_WRITE);
4559 if (ret) {
4560 mlog_errno(ret);
4561 goto out;
4562 }
4563
4564 xh = bucket_xh(s_bucket);
4565 count = le16_to_cpu(xh->xh_count);
4566 start = ocfs2_xattr_find_divide_pos(xh);
4567
4568 if (start == count) {
4569 xe = &xh->xh_entries[start-1];
4570
4571 /*
4572 * initialized a new empty bucket here.
4573 * The hash value is set as one larger than
4574 * that of the last entry in the previous bucket.
4575 */
4576 for (i = 0; i < t_bucket->bu_blocks; i++)
4577 memset(bucket_block(t_bucket, i), 0, blocksize);
4578
4579 xh = bucket_xh(t_bucket);
4580 xh->xh_free_start = cpu_to_le16(blocksize);
4581 xh->xh_entries[0].xe_name_hash = xe->xe_name_hash;
4582 le32_add_cpu(&xh->xh_entries[0].xe_name_hash, 1);
4583
4584 goto set_num_buckets;
4585 }
4586
4587 /* copy the whole bucket to the new first. */
4588 ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4589
4590 /* update the new bucket. */
4591 xh = bucket_xh(t_bucket);
4592
4593 /*
4594 * Calculate the total name/value len and xh_free_start for
4595 * the old bucket first.
4596 */
4597 name_offset = OCFS2_XATTR_BUCKET_SIZE;
4598 name_value_len = 0;
4599 for (i = 0; i < start; i++) {
4600 xe = &xh->xh_entries[i];
4601 name_value_len += namevalue_size_xe(xe);
4602 if (le16_to_cpu(xe->xe_name_offset) < name_offset)
4603 name_offset = le16_to_cpu(xe->xe_name_offset);
4604 }
4605
4606 /*
4607 * Now begin the modification to the new bucket.
4608 *
4609 * In the new bucket, We just move the xattr entry to the beginning
4610 * and don't touch the name/value. So there will be some holes in the
4611 * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
4612 * called.
4613 */
4614 xe = &xh->xh_entries[start];
4615 len = sizeof(struct ocfs2_xattr_entry) * (count - start);
4616 mlog(0, "mv xattr entry len %d from %d to %d\n", len,
4617 (int)((char *)xe - (char *)xh),
4618 (int)((char *)xh->xh_entries - (char *)xh));
4619 memmove((char *)xh->xh_entries, (char *)xe, len);
4620 xe = &xh->xh_entries[count - start];
4621 len = sizeof(struct ocfs2_xattr_entry) * start;
4622 memset((char *)xe, 0, len);
4623
4624 le16_add_cpu(&xh->xh_count, -start);
4625 le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
4626
4627 /* Calculate xh_free_start for the new bucket. */
4628 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
4629 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
4630 xe = &xh->xh_entries[i];
4631 if (le16_to_cpu(xe->xe_name_offset) <
4632 le16_to_cpu(xh->xh_free_start))
4633 xh->xh_free_start = xe->xe_name_offset;
4634 }
4635
4636 set_num_buckets:
4637 /* set xh->xh_num_buckets for the new xh. */
4638 if (new_bucket_head)
4639 xh->xh_num_buckets = cpu_to_le16(1);
4640 else
4641 xh->xh_num_buckets = 0;
4642
4643 ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4644
4645 /* store the first_hash of the new bucket. */
4646 if (first_hash)
4647 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
4648
4649 /*
4650 * Now only update the 1st block of the old bucket. If we
4651 * just added a new empty bucket, there is no need to modify
4652 * it.
4653 */
4654 if (start == count)
4655 goto out;
4656
4657 xh = bucket_xh(s_bucket);
4658 memset(&xh->xh_entries[start], 0,
4659 sizeof(struct ocfs2_xattr_entry) * (count - start));
4660 xh->xh_count = cpu_to_le16(start);
4661 xh->xh_free_start = cpu_to_le16(name_offset);
4662 xh->xh_name_value_len = cpu_to_le16(name_value_len);
4663
4664 ocfs2_xattr_bucket_journal_dirty(handle, s_bucket);
4665
4666 out:
4667 ocfs2_xattr_bucket_free(s_bucket);
4668 ocfs2_xattr_bucket_free(t_bucket);
4669
4670 return ret;
4671 }
4672
4673 /*
4674 * Copy xattr from one bucket to another bucket.
4675 *
4676 * The caller must make sure that the journal transaction
4677 * has enough space for journaling.
4678 */
4679 static int ocfs2_cp_xattr_bucket(struct inode *inode,
4680 handle_t *handle,
4681 u64 s_blkno,
4682 u64 t_blkno,
4683 int t_is_new)
4684 {
4685 int ret;
4686 struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
4687
4688 BUG_ON(s_blkno == t_blkno);
4689
4690 mlog(0, "cp bucket %llu to %llu, target is %d\n",
4691 (unsigned long long)s_blkno, (unsigned long long)t_blkno,
4692 t_is_new);
4693
4694 s_bucket = ocfs2_xattr_bucket_new(inode);
4695 t_bucket = ocfs2_xattr_bucket_new(inode);
4696 if (!s_bucket || !t_bucket) {
4697 ret = -ENOMEM;
4698 mlog_errno(ret);
4699 goto out;
4700 }
4701
4702 ret = ocfs2_read_xattr_bucket(s_bucket, s_blkno);
4703 if (ret)
4704 goto out;
4705
4706 /*
4707 * Even if !t_is_new, we're overwriting t_bucket. Thus,
4708 * there's no need to read it.
4709 */
4710 ret = ocfs2_init_xattr_bucket(t_bucket, t_blkno);
4711 if (ret)
4712 goto out;
4713
4714 /*
4715 * Hey, if we're overwriting t_bucket, what difference does
4716 * ACCESS_CREATE vs ACCESS_WRITE make? Well, if we allocated a new
4717 * cluster to fill, we came here from
4718 * ocfs2_mv_xattr_buckets(), and it is really new -
4719 * ACCESS_CREATE is required. But we also might have moved data
4720 * out of t_bucket before extending back into it.
4721 * ocfs2_add_new_xattr_bucket() can do this - its call to
4722 * ocfs2_add_new_xattr_cluster() may have created a new extent
4723 * and copied out the end of the old extent. Then it re-extends
4724 * the old extent back to create space for new xattrs. That's
4725 * how we get here, and the bucket isn't really new.
4726 */
4727 ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4728 t_is_new ?
4729 OCFS2_JOURNAL_ACCESS_CREATE :
4730 OCFS2_JOURNAL_ACCESS_WRITE);
4731 if (ret)
4732 goto out;
4733
4734 ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4735 ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4736
4737 out:
4738 ocfs2_xattr_bucket_free(t_bucket);
4739 ocfs2_xattr_bucket_free(s_bucket);
4740
4741 return ret;
4742 }
4743
4744 /*
4745 * src_blk points to the start of an existing extent. last_blk points to
4746 * last cluster in that extent. to_blk points to a newly allocated
4747 * extent. We copy the buckets from the cluster at last_blk to the new
4748 * extent. If start_bucket is non-zero, we skip that many buckets before
4749 * we start copying. The new extent's xh_num_buckets gets set to the
4750 * number of buckets we copied. The old extent's xh_num_buckets shrinks
4751 * by the same amount.
4752 */
4753 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
4754 u64 src_blk, u64 last_blk, u64 to_blk,
4755 unsigned int start_bucket,
4756 u32 *first_hash)
4757 {
4758 int i, ret, credits;
4759 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4760 int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4761 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
4762 struct ocfs2_xattr_bucket *old_first, *new_first;
4763
4764 mlog(0, "mv xattrs from cluster %llu to %llu\n",
4765 (unsigned long long)last_blk, (unsigned long long)to_blk);
4766
4767 BUG_ON(start_bucket >= num_buckets);
4768 if (start_bucket) {
4769 num_buckets -= start_bucket;
4770 last_blk += (start_bucket * blks_per_bucket);
4771 }
4772
4773 /* The first bucket of the original extent */
4774 old_first = ocfs2_xattr_bucket_new(inode);
4775 /* The first bucket of the new extent */
4776 new_first = ocfs2_xattr_bucket_new(inode);
4777 if (!old_first || !new_first) {
4778 ret = -ENOMEM;
4779 mlog_errno(ret);
4780 goto out;
4781 }
4782
4783 ret = ocfs2_read_xattr_bucket(old_first, src_blk);
4784 if (ret) {
4785 mlog_errno(ret);
4786 goto out;
4787 }
4788
4789 /*
4790 * We need to update the first bucket of the old extent and all
4791 * the buckets going to the new extent.
4792 */
4793 credits = ((num_buckets + 1) * blks_per_bucket) +
4794 handle->h_buffer_credits;
4795 ret = ocfs2_extend_trans(handle, credits);
4796 if (ret) {
4797 mlog_errno(ret);
4798 goto out;
4799 }
4800
4801 ret = ocfs2_xattr_bucket_journal_access(handle, old_first,
4802 OCFS2_JOURNAL_ACCESS_WRITE);
4803 if (ret) {
4804 mlog_errno(ret);
4805 goto out;
4806 }
4807
4808 for (i = 0; i < num_buckets; i++) {
4809 ret = ocfs2_cp_xattr_bucket(inode, handle,
4810 last_blk + (i * blks_per_bucket),
4811 to_blk + (i * blks_per_bucket),
4812 1);
4813 if (ret) {
4814 mlog_errno(ret);
4815 goto out;
4816 }
4817 }
4818
4819 /*
4820 * Get the new bucket ready before we dirty anything
4821 * (This actually shouldn't fail, because we already dirtied
4822 * it once in ocfs2_cp_xattr_bucket()).
4823 */
4824 ret = ocfs2_read_xattr_bucket(new_first, to_blk);
4825 if (ret) {
4826 mlog_errno(ret);
4827 goto out;
4828 }
4829 ret = ocfs2_xattr_bucket_journal_access(handle, new_first,
4830 OCFS2_JOURNAL_ACCESS_WRITE);
4831 if (ret) {
4832 mlog_errno(ret);
4833 goto out;
4834 }
4835
4836 /* Now update the headers */
4837 le16_add_cpu(&bucket_xh(old_first)->xh_num_buckets, -num_buckets);
4838 ocfs2_xattr_bucket_journal_dirty(handle, old_first);
4839
4840 bucket_xh(new_first)->xh_num_buckets = cpu_to_le16(num_buckets);
4841 ocfs2_xattr_bucket_journal_dirty(handle, new_first);
4842
4843 if (first_hash)
4844 *first_hash = le32_to_cpu(bucket_xh(new_first)->xh_entries[0].xe_name_hash);
4845
4846 out:
4847 ocfs2_xattr_bucket_free(new_first);
4848 ocfs2_xattr_bucket_free(old_first);
4849 return ret;
4850 }
4851
4852 /*
4853 * Move some xattrs in this cluster to the new cluster.
4854 * This function should only be called when bucket size == cluster size.
4855 * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
4856 */
4857 static int ocfs2_divide_xattr_cluster(struct inode *inode,
4858 handle_t *handle,
4859 u64 prev_blk,
4860 u64 new_blk,
4861 u32 *first_hash)
4862 {
4863 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4864 int ret, credits = 2 * blk_per_bucket + handle->h_buffer_credits;
4865
4866 BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
4867
4868 ret = ocfs2_extend_trans(handle, credits);
4869 if (ret) {
4870 mlog_errno(ret);
4871 return ret;
4872 }
4873
4874 /* Move half of the xattr in start_blk to the next bucket. */
4875 return ocfs2_divide_xattr_bucket(inode, handle, prev_blk,
4876 new_blk, first_hash, 1);
4877 }
4878
4879 /*
4880 * Move some xattrs from the old cluster to the new one since they are not
4881 * contiguous in ocfs2 xattr tree.
4882 *
4883 * new_blk starts a new separate cluster, and we will move some xattrs from
4884 * prev_blk to it. v_start will be set as the first name hash value in this
4885 * new cluster so that it can be used as e_cpos during tree insertion and
4886 * don't collide with our original b-tree operations. first_bh and header_bh
4887 * will also be updated since they will be used in ocfs2_extend_xattr_bucket
4888 * to extend the insert bucket.
4889 *
4890 * The problem is how much xattr should we move to the new one and when should
4891 * we update first_bh and header_bh?
4892 * 1. If cluster size > bucket size, that means the previous cluster has more
4893 * than 1 bucket, so just move half nums of bucket into the new cluster and
4894 * update the first_bh and header_bh if the insert bucket has been moved
4895 * to the new cluster.
4896 * 2. If cluster_size == bucket_size:
4897 * a) If the previous extent rec has more than one cluster and the insert
4898 * place isn't in the last cluster, copy the entire last cluster to the
4899 * new one. This time, we don't need to upate the first_bh and header_bh
4900 * since they will not be moved into the new cluster.
4901 * b) Otherwise, move the bottom half of the xattrs in the last cluster into
4902 * the new one. And we set the extend flag to zero if the insert place is
4903 * moved into the new allocated cluster since no extend is needed.
4904 */
4905 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
4906 handle_t *handle,
4907 struct ocfs2_xattr_bucket *first,
4908 struct ocfs2_xattr_bucket *target,
4909 u64 new_blk,
4910 u32 prev_clusters,
4911 u32 *v_start,
4912 int *extend)
4913 {
4914 int ret;
4915
4916 mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n",
4917 (unsigned long long)bucket_blkno(first), prev_clusters,
4918 (unsigned long long)new_blk);
4919
4920 if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1) {
4921 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
4922 handle,
4923 first, target,
4924 new_blk,
4925 prev_clusters,
4926 v_start);
4927 if (ret)
4928 mlog_errno(ret);
4929 } else {
4930 /* The start of the last cluster in the first extent */
4931 u64 last_blk = bucket_blkno(first) +
4932 ((prev_clusters - 1) *
4933 ocfs2_clusters_to_blocks(inode->i_sb, 1));
4934
4935 if (prev_clusters > 1 && bucket_blkno(target) != last_blk) {
4936 ret = ocfs2_mv_xattr_buckets(inode, handle,
4937 bucket_blkno(first),
4938 last_blk, new_blk, 0,
4939 v_start);
4940 if (ret)
4941 mlog_errno(ret);
4942 } else {
4943 ret = ocfs2_divide_xattr_cluster(inode, handle,
4944 last_blk, new_blk,
4945 v_start);
4946 if (ret)
4947 mlog_errno(ret);
4948
4949 if ((bucket_blkno(target) == last_blk) && extend)
4950 *extend = 0;
4951 }
4952 }
4953
4954 return ret;
4955 }
4956
4957 /*
4958 * Add a new cluster for xattr storage.
4959 *
4960 * If the new cluster is contiguous with the previous one, it will be
4961 * appended to the same extent record, and num_clusters will be updated.
4962 * If not, we will insert a new extent for it and move some xattrs in
4963 * the last cluster into the new allocated one.
4964 * We also need to limit the maximum size of a btree leaf, otherwise we'll
4965 * lose the benefits of hashing because we'll have to search large leaves.
4966 * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
4967 * if it's bigger).
4968 *
4969 * first_bh is the first block of the previous extent rec and header_bh
4970 * indicates the bucket we will insert the new xattrs. They will be updated
4971 * when the header_bh is moved into the new cluster.
4972 */
4973 static int ocfs2_add_new_xattr_cluster(struct inode *inode,
4974 struct buffer_head *root_bh,
4975 struct ocfs2_xattr_bucket *first,
4976 struct ocfs2_xattr_bucket *target,
4977 u32 *num_clusters,
4978 u32 prev_cpos,
4979 int *extend,
4980 struct ocfs2_xattr_set_ctxt *ctxt)
4981 {
4982 int ret;
4983 u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
4984 u32 prev_clusters = *num_clusters;
4985 u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
4986 u64 block;
4987 handle_t *handle = ctxt->handle;
4988 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4989 struct ocfs2_extent_tree et;
4990
4991 mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, "
4992 "previous xattr blkno = %llu\n",
4993 (unsigned long long)OCFS2_I(inode)->ip_blkno,
4994 prev_cpos, (unsigned long long)bucket_blkno(first));
4995
4996 ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
4997
4998 ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
4999 OCFS2_JOURNAL_ACCESS_WRITE);
5000 if (ret < 0) {
5001 mlog_errno(ret);
5002 goto leave;
5003 }
5004
5005 ret = __ocfs2_claim_clusters(osb, handle, ctxt->data_ac, 1,
5006 clusters_to_add, &bit_off, &num_bits);
5007 if (ret < 0) {
5008 if (ret != -ENOSPC)
5009 mlog_errno(ret);
5010 goto leave;
5011 }
5012
5013 BUG_ON(num_bits > clusters_to_add);
5014
5015 block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
5016 mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n",
5017 num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
5018
5019 if (bucket_blkno(first) + (prev_clusters * bpc) == block &&
5020 (prev_clusters + num_bits) << osb->s_clustersize_bits <=
5021 OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
5022 /*
5023 * If this cluster is contiguous with the old one and
5024 * adding this new cluster, we don't surpass the limit of
5025 * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
5026 * initialized and used like other buckets in the previous
5027 * cluster.
5028 * So add it as a contiguous one. The caller will handle
5029 * its init process.
5030 */
5031 v_start = prev_cpos + prev_clusters;
5032 *num_clusters = prev_clusters + num_bits;
5033 mlog(0, "Add contiguous %u clusters to previous extent rec.\n",
5034 num_bits);
5035 } else {
5036 ret = ocfs2_adjust_xattr_cross_cluster(inode,
5037 handle,
5038 first,
5039 target,
5040 block,
5041 prev_clusters,
5042 &v_start,
5043 extend);
5044 if (ret) {
5045 mlog_errno(ret);
5046 goto leave;
5047 }
5048 }
5049
5050 mlog(0, "Insert %u clusters at block %llu for xattr at %u\n",
5051 num_bits, (unsigned long long)block, v_start);
5052 ret = ocfs2_insert_extent(handle, &et, v_start, block,
5053 num_bits, 0, ctxt->meta_ac);
5054 if (ret < 0) {
5055 mlog_errno(ret);
5056 goto leave;
5057 }
5058
5059 ret = ocfs2_journal_dirty(handle, root_bh);
5060 if (ret < 0)
5061 mlog_errno(ret);
5062
5063 leave:
5064 return ret;
5065 }
5066
5067 /*
5068 * We are given an extent. 'first' is the bucket at the very front of
5069 * the extent. The extent has space for an additional bucket past
5070 * bucket_xh(first)->xh_num_buckets. 'target_blkno' is the block number
5071 * of the target bucket. We wish to shift every bucket past the target
5072 * down one, filling in that additional space. When we get back to the
5073 * target, we split the target between itself and the now-empty bucket
5074 * at target+1 (aka, target_blkno + blks_per_bucket).
5075 */
5076 static int ocfs2_extend_xattr_bucket(struct inode *inode,
5077 handle_t *handle,
5078 struct ocfs2_xattr_bucket *first,
5079 u64 target_blk,
5080 u32 num_clusters)
5081 {
5082 int ret, credits;
5083 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5084 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5085 u64 end_blk;
5086 u16 new_bucket = le16_to_cpu(bucket_xh(first)->xh_num_buckets);
5087
5088 mlog(0, "extend xattr bucket in %llu, xattr extend rec starting "
5089 "from %llu, len = %u\n", (unsigned long long)target_blk,
5090 (unsigned long long)bucket_blkno(first), num_clusters);
5091
5092 /* The extent must have room for an additional bucket */
5093 BUG_ON(new_bucket >=
5094 (num_clusters * ocfs2_xattr_buckets_per_cluster(osb)));
5095
5096 /* end_blk points to the last existing bucket */
5097 end_blk = bucket_blkno(first) + ((new_bucket - 1) * blk_per_bucket);
5098
5099 /*
5100 * end_blk is the start of the last existing bucket.
5101 * Thus, (end_blk - target_blk) covers the target bucket and
5102 * every bucket after it up to, but not including, the last
5103 * existing bucket. Then we add the last existing bucket, the
5104 * new bucket, and the first bucket (3 * blk_per_bucket).
5105 */
5106 credits = (end_blk - target_blk) + (3 * blk_per_bucket) +
5107 handle->h_buffer_credits;
5108 ret = ocfs2_extend_trans(handle, credits);
5109 if (ret) {
5110 mlog_errno(ret);
5111 goto out;
5112 }
5113
5114 ret = ocfs2_xattr_bucket_journal_access(handle, first,
5115 OCFS2_JOURNAL_ACCESS_WRITE);
5116 if (ret) {
5117 mlog_errno(ret);
5118 goto out;
5119 }
5120
5121 while (end_blk != target_blk) {
5122 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
5123 end_blk + blk_per_bucket, 0);
5124 if (ret)
5125 goto out;
5126 end_blk -= blk_per_bucket;
5127 }
5128
5129 /* Move half of the xattr in target_blkno to the next bucket. */
5130 ret = ocfs2_divide_xattr_bucket(inode, handle, target_blk,
5131 target_blk + blk_per_bucket, NULL, 0);
5132
5133 le16_add_cpu(&bucket_xh(first)->xh_num_buckets, 1);
5134 ocfs2_xattr_bucket_journal_dirty(handle, first);
5135
5136 out:
5137 return ret;
5138 }
5139
5140 /*
5141 * Add new xattr bucket in an extent record and adjust the buckets
5142 * accordingly. xb_bh is the ocfs2_xattr_block, and target is the
5143 * bucket we want to insert into.
5144 *
5145 * In the easy case, we will move all the buckets after target down by
5146 * one. Half of target's xattrs will be moved to the next bucket.
5147 *
5148 * If current cluster is full, we'll allocate a new one. This may not
5149 * be contiguous. The underlying calls will make sure that there is
5150 * space for the insert, shifting buckets around if necessary.
5151 * 'target' may be moved by those calls.
5152 */
5153 static int ocfs2_add_new_xattr_bucket(struct inode *inode,
5154 struct buffer_head *xb_bh,
5155 struct ocfs2_xattr_bucket *target,
5156 struct ocfs2_xattr_set_ctxt *ctxt)
5157 {
5158 struct ocfs2_xattr_block *xb =
5159 (struct ocfs2_xattr_block *)xb_bh->b_data;
5160 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
5161 struct ocfs2_extent_list *el = &xb_root->xt_list;
5162 u32 name_hash =
5163 le32_to_cpu(bucket_xh(target)->xh_entries[0].xe_name_hash);
5164 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5165 int ret, num_buckets, extend = 1;
5166 u64 p_blkno;
5167 u32 e_cpos, num_clusters;
5168 /* The bucket at the front of the extent */
5169 struct ocfs2_xattr_bucket *first;
5170
5171 mlog(0, "Add new xattr bucket starting from %llu\n",
5172 (unsigned long long)bucket_blkno(target));
5173
5174 /* The first bucket of the original extent */
5175 first = ocfs2_xattr_bucket_new(inode);
5176 if (!first) {
5177 ret = -ENOMEM;
5178 mlog_errno(ret);
5179 goto out;
5180 }
5181
5182 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
5183 &num_clusters, el);
5184 if (ret) {
5185 mlog_errno(ret);
5186 goto out;
5187 }
5188
5189 ret = ocfs2_read_xattr_bucket(first, p_blkno);
5190 if (ret) {
5191 mlog_errno(ret);
5192 goto out;
5193 }
5194
5195 num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
5196 if (num_buckets == le16_to_cpu(bucket_xh(first)->xh_num_buckets)) {
5197 /*
5198 * This can move first+target if the target bucket moves
5199 * to the new extent.
5200 */
5201 ret = ocfs2_add_new_xattr_cluster(inode,
5202 xb_bh,
5203 first,
5204 target,
5205 &num_clusters,
5206 e_cpos,
5207 &extend,
5208 ctxt);
5209 if (ret) {
5210 mlog_errno(ret);
5211 goto out;
5212 }
5213 }
5214
5215 if (extend) {
5216 ret = ocfs2_extend_xattr_bucket(inode,
5217 ctxt->handle,
5218 first,
5219 bucket_blkno(target),
5220 num_clusters);
5221 if (ret)
5222 mlog_errno(ret);
5223 }
5224
5225 out:
5226 ocfs2_xattr_bucket_free(first);
5227
5228 return ret;
5229 }
5230
5231 static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode,
5232 struct ocfs2_xattr_bucket *bucket,
5233 int offs)
5234 {
5235 int block_off = offs >> inode->i_sb->s_blocksize_bits;
5236
5237 offs = offs % inode->i_sb->s_blocksize;
5238 return bucket_block(bucket, block_off) + offs;
5239 }
5240
5241 /*
5242 * Truncate the specified xe_off entry in xattr bucket.
5243 * bucket is indicated by header_bh and len is the new length.
5244 * Both the ocfs2_xattr_value_root and the entry will be updated here.
5245 *
5246 * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
5247 */
5248 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
5249 struct ocfs2_xattr_bucket *bucket,
5250 int xe_off,
5251 int len,
5252 struct ocfs2_xattr_set_ctxt *ctxt)
5253 {
5254 int ret, offset;
5255 u64 value_blk;
5256 struct ocfs2_xattr_entry *xe;
5257 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5258 size_t blocksize = inode->i_sb->s_blocksize;
5259 struct ocfs2_xattr_value_buf vb = {
5260 .vb_access = ocfs2_journal_access,
5261 };
5262
5263 xe = &xh->xh_entries[xe_off];
5264
5265 BUG_ON(!xe || ocfs2_xattr_is_local(xe));
5266
5267 offset = le16_to_cpu(xe->xe_name_offset) +
5268 OCFS2_XATTR_SIZE(xe->xe_name_len);
5269
5270 value_blk = offset / blocksize;
5271
5272 /* We don't allow ocfs2_xattr_value to be stored in different block. */
5273 BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
5274
5275 vb.vb_bh = bucket->bu_bhs[value_blk];
5276 BUG_ON(!vb.vb_bh);
5277
5278 vb.vb_xv = (struct ocfs2_xattr_value_root *)
5279 (vb.vb_bh->b_data + offset % blocksize);
5280
5281 /*
5282 * From here on out we have to dirty the bucket. The generic
5283 * value calls only modify one of the bucket's bhs, but we need
5284 * to send the bucket at once. So if they error, they *could* have
5285 * modified something. We have to assume they did, and dirty
5286 * the whole bucket. This leaves us in a consistent state.
5287 */
5288 mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n",
5289 xe_off, (unsigned long long)bucket_blkno(bucket), len);
5290 ret = ocfs2_xattr_value_truncate(inode, &vb, len, ctxt);
5291 if (ret) {
5292 mlog_errno(ret);
5293 goto out;
5294 }
5295
5296 ret = ocfs2_xattr_bucket_journal_access(ctxt->handle, bucket,
5297 OCFS2_JOURNAL_ACCESS_WRITE);
5298 if (ret) {
5299 mlog_errno(ret);
5300 goto out;
5301 }
5302
5303 xe->xe_value_size = cpu_to_le64(len);
5304
5305 ocfs2_xattr_bucket_journal_dirty(ctxt->handle, bucket);
5306
5307 out:
5308 return ret;
5309 }
5310
5311 static int ocfs2_rm_xattr_cluster(struct inode *inode,
5312 struct buffer_head *root_bh,
5313 u64 blkno,
5314 u32 cpos,
5315 u32 len,
5316 void *para)
5317 {
5318 int ret;
5319 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5320 struct inode *tl_inode = osb->osb_tl_inode;
5321 handle_t *handle;
5322 struct ocfs2_xattr_block *xb =
5323 (struct ocfs2_xattr_block *)root_bh->b_data;
5324 struct ocfs2_alloc_context *meta_ac = NULL;
5325 struct ocfs2_cached_dealloc_ctxt dealloc;
5326 struct ocfs2_extent_tree et;
5327
5328 ret = ocfs2_iterate_xattr_buckets(inode, blkno, len,
5329 ocfs2_delete_xattr_in_bucket, para);
5330 if (ret) {
5331 mlog_errno(ret);
5332 return ret;
5333 }
5334
5335 ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
5336
5337 ocfs2_init_dealloc_ctxt(&dealloc);
5338
5339 mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n",
5340 cpos, len, (unsigned long long)blkno);
5341
5342 ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode), blkno,
5343 len);
5344
5345 ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
5346 if (ret) {
5347 mlog_errno(ret);
5348 return ret;
5349 }
5350
5351 mutex_lock(&tl_inode->i_mutex);
5352
5353 if (ocfs2_truncate_log_needs_flush(osb)) {
5354 ret = __ocfs2_flush_truncate_log(osb);
5355 if (ret < 0) {
5356 mlog_errno(ret);
5357 goto out;
5358 }
5359 }
5360
5361 handle = ocfs2_start_trans(osb, ocfs2_remove_extent_credits(osb->sb));
5362 if (IS_ERR(handle)) {
5363 ret = -ENOMEM;
5364 mlog_errno(ret);
5365 goto out;
5366 }
5367
5368 ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
5369 OCFS2_JOURNAL_ACCESS_WRITE);
5370 if (ret) {
5371 mlog_errno(ret);
5372 goto out_commit;
5373 }
5374
5375 ret = ocfs2_remove_extent(handle, &et, cpos, len, meta_ac,
5376 &dealloc);
5377 if (ret) {
5378 mlog_errno(ret);
5379 goto out_commit;
5380 }
5381
5382 le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
5383
5384 ret = ocfs2_journal_dirty(handle, root_bh);
5385 if (ret) {
5386 mlog_errno(ret);
5387 goto out_commit;
5388 }
5389
5390 ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
5391 if (ret)
5392 mlog_errno(ret);
5393
5394 out_commit:
5395 ocfs2_commit_trans(osb, handle);
5396 out:
5397 ocfs2_schedule_truncate_log_flush(osb, 1);
5398
5399 mutex_unlock(&tl_inode->i_mutex);
5400
5401 if (meta_ac)
5402 ocfs2_free_alloc_context(meta_ac);
5403
5404 ocfs2_run_deallocs(osb, &dealloc);
5405
5406 return ret;
5407 }
5408
5409 /*
5410 * check whether the xattr bucket is filled up with the same hash value.
5411 * If we want to insert the xattr with the same hash, return -ENOSPC.
5412 * If we want to insert a xattr with different hash value, go ahead
5413 * and ocfs2_divide_xattr_bucket will handle this.
5414 */
5415 static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
5416 struct ocfs2_xattr_bucket *bucket,
5417 const char *name)
5418 {
5419 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5420 u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
5421
5422 if (name_hash != le32_to_cpu(xh->xh_entries[0].xe_name_hash))
5423 return 0;
5424
5425 if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
5426 xh->xh_entries[0].xe_name_hash) {
5427 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
5428 "hash = %u\n",
5429 (unsigned long long)bucket_blkno(bucket),
5430 le32_to_cpu(xh->xh_entries[0].xe_name_hash));
5431 return -ENOSPC;
5432 }
5433
5434 return 0;
5435 }
5436
5437 /*
5438 * Try to set the entry in the current bucket. If we fail, the caller
5439 * will handle getting us another bucket.
5440 */
5441 static int ocfs2_xattr_set_entry_bucket(struct inode *inode,
5442 struct ocfs2_xattr_info *xi,
5443 struct ocfs2_xattr_search *xs,
5444 struct ocfs2_xattr_set_ctxt *ctxt)
5445 {
5446 int ret;
5447 struct ocfs2_xa_loc loc;
5448
5449 mlog_entry("Set xattr %s in xattr bucket\n", xi->xi_name);
5450
5451 ocfs2_init_xattr_bucket_xa_loc(&loc, xs->bucket,
5452 xs->not_found ? NULL : xs->here);
5453 ret = ocfs2_xa_set(&loc, xi, ctxt);
5454 if (!ret) {
5455 xs->here = loc.xl_entry;
5456 goto out;
5457 }
5458 if (ret != -ENOSPC) {
5459 mlog_errno(ret);
5460 goto out;
5461 }
5462
5463 /* Ok, we need space. Let's try defragmenting the bucket. */
5464 ret = ocfs2_defrag_xattr_bucket(inode, ctxt->handle,
5465 xs->bucket);
5466 if (ret) {
5467 mlog_errno(ret);
5468 goto out;
5469 }
5470
5471 ret = ocfs2_xa_set(&loc, xi, ctxt);
5472 if (!ret) {
5473 xs->here = loc.xl_entry;
5474 goto out;
5475 }
5476 if (ret != -ENOSPC)
5477 mlog_errno(ret);
5478
5479
5480 out:
5481 mlog_exit(ret);
5482 return ret;
5483 }
5484
5485 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
5486 struct ocfs2_xattr_info *xi,
5487 struct ocfs2_xattr_search *xs,
5488 struct ocfs2_xattr_set_ctxt *ctxt)
5489 {
5490 int ret;
5491
5492 mlog_entry("Set xattr %s in xattr index block\n", xi->xi_name);
5493
5494 ret = ocfs2_xattr_set_entry_bucket(inode, xi, xs, ctxt);
5495 if (!ret)
5496 goto out;
5497 if (ret != -ENOSPC) {
5498 mlog_errno(ret);
5499 goto out;
5500 }
5501
5502 /* Ack, need more space. Let's try to get another bucket! */
5503
5504 /*
5505 * We do not allow for overlapping ranges between buckets. And
5506 * the maximum number of collisions we will allow for then is
5507 * one bucket's worth, so check it here whether we need to
5508 * add a new bucket for the insert.
5509 */
5510 ret = ocfs2_check_xattr_bucket_collision(inode,
5511 xs->bucket,
5512 xi->xi_name);
5513 if (ret) {
5514 mlog_errno(ret);
5515 goto out;
5516 }
5517
5518 ret = ocfs2_add_new_xattr_bucket(inode,
5519 xs->xattr_bh,
5520 xs->bucket,
5521 ctxt);
5522 if (ret) {
5523 mlog_errno(ret);
5524 goto out;
5525 }
5526
5527 /*
5528 * ocfs2_add_new_xattr_bucket() will have updated
5529 * xs->bucket if it moved, but it will not have updated
5530 * any of the other search fields. Thus, we drop it and
5531 * re-search. Everything should be cached, so it'll be
5532 * quick.
5533 */
5534 ocfs2_xattr_bucket_relse(xs->bucket);
5535 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
5536 xi->xi_name_index,
5537 xi->xi_name, xs);
5538 if (ret && ret != -ENODATA)
5539 goto out;
5540 xs->not_found = ret;
5541
5542 /* Ok, we have a new bucket, let's try again */
5543 ret = ocfs2_xattr_set_entry_bucket(inode, xi, xs, ctxt);
5544 if (ret && (ret != -ENOSPC))
5545 mlog_errno(ret);
5546
5547 out:
5548 mlog_exit(ret);
5549 return ret;
5550 }
5551
5552 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
5553 struct ocfs2_xattr_bucket *bucket,
5554 void *para)
5555 {
5556 int ret = 0, ref_credits;
5557 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5558 u16 i;
5559 struct ocfs2_xattr_entry *xe;
5560 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5561 struct ocfs2_xattr_set_ctxt ctxt = {NULL, NULL,};
5562 int credits = ocfs2_remove_extent_credits(osb->sb) +
5563 ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5564 struct ocfs2_xattr_value_root *xv;
5565 struct ocfs2_rm_xattr_bucket_para *args =
5566 (struct ocfs2_rm_xattr_bucket_para *)para;
5567
5568 ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
5569
5570 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
5571 xe = &xh->xh_entries[i];
5572 if (ocfs2_xattr_is_local(xe))
5573 continue;
5574
5575 ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket,
5576 i, &xv, NULL);
5577
5578 ret = ocfs2_lock_xattr_remove_allocators(inode, xv,
5579 args->ref_ci,
5580 args->ref_root_bh,
5581 &ctxt.meta_ac,
5582 &ref_credits);
5583
5584 ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
5585 if (IS_ERR(ctxt.handle)) {
5586 ret = PTR_ERR(ctxt.handle);
5587 mlog_errno(ret);
5588 break;
5589 }
5590
5591 ret = ocfs2_xattr_bucket_value_truncate(inode, bucket,
5592 i, 0, &ctxt);
5593
5594 ocfs2_commit_trans(osb, ctxt.handle);
5595 if (ctxt.meta_ac) {
5596 ocfs2_free_alloc_context(ctxt.meta_ac);
5597 ctxt.meta_ac = NULL;
5598 }
5599 if (ret) {
5600 mlog_errno(ret);
5601 break;
5602 }
5603 }
5604
5605 if (ctxt.meta_ac)
5606 ocfs2_free_alloc_context(ctxt.meta_ac);
5607 ocfs2_schedule_truncate_log_flush(osb, 1);
5608 ocfs2_run_deallocs(osb, &ctxt.dealloc);
5609 return ret;
5610 }
5611
5612 /*
5613 * Whenever we modify a xattr value root in the bucket(e.g, CoW
5614 * or change the extent record flag), we need to recalculate
5615 * the metaecc for the whole bucket. So it is done here.
5616 *
5617 * Note:
5618 * We have to give the extra credits for the caller.
5619 */
5620 static int ocfs2_xattr_bucket_post_refcount(struct inode *inode,
5621 handle_t *handle,
5622 void *para)
5623 {
5624 int ret;
5625 struct ocfs2_xattr_bucket *bucket =
5626 (struct ocfs2_xattr_bucket *)para;
5627
5628 ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
5629 OCFS2_JOURNAL_ACCESS_WRITE);
5630 if (ret) {
5631 mlog_errno(ret);
5632 return ret;
5633 }
5634
5635 ocfs2_xattr_bucket_journal_dirty(handle, bucket);
5636
5637 return 0;
5638 }
5639
5640 /*
5641 * Special action we need if the xattr value is refcounted.
5642 *
5643 * 1. If the xattr is refcounted, lock the tree.
5644 * 2. CoW the xattr if we are setting the new value and the value
5645 * will be stored outside.
5646 * 3. In other case, decrease_refcount will work for us, so just
5647 * lock the refcount tree, calculate the meta and credits is OK.
5648 *
5649 * We have to do CoW before ocfs2_init_xattr_set_ctxt since
5650 * currently CoW is a completed transaction, while this function
5651 * will also lock the allocators and let us deadlock. So we will
5652 * CoW the whole xattr value.
5653 */
5654 static int ocfs2_prepare_refcount_xattr(struct inode *inode,
5655 struct ocfs2_dinode *di,
5656 struct ocfs2_xattr_info *xi,
5657 struct ocfs2_xattr_search *xis,
5658 struct ocfs2_xattr_search *xbs,
5659 struct ocfs2_refcount_tree **ref_tree,
5660 int *meta_add,
5661 int *credits)
5662 {
5663 int ret = 0;
5664 struct ocfs2_xattr_block *xb;
5665 struct ocfs2_xattr_entry *xe;
5666 char *base;
5667 u32 p_cluster, num_clusters;
5668 unsigned int ext_flags;
5669 int name_offset, name_len;
5670 struct ocfs2_xattr_value_buf vb;
5671 struct ocfs2_xattr_bucket *bucket = NULL;
5672 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5673 struct ocfs2_post_refcount refcount;
5674 struct ocfs2_post_refcount *p = NULL;
5675 struct buffer_head *ref_root_bh = NULL;
5676
5677 if (!xis->not_found) {
5678 xe = xis->here;
5679 name_offset = le16_to_cpu(xe->xe_name_offset);
5680 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5681 base = xis->base;
5682 vb.vb_bh = xis->inode_bh;
5683 vb.vb_access = ocfs2_journal_access_di;
5684 } else {
5685 int i, block_off = 0;
5686 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
5687 xe = xbs->here;
5688 name_offset = le16_to_cpu(xe->xe_name_offset);
5689 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5690 i = xbs->here - xbs->header->xh_entries;
5691
5692 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
5693 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
5694 bucket_xh(xbs->bucket),
5695 i, &block_off,
5696 &name_offset);
5697 if (ret) {
5698 mlog_errno(ret);
5699 goto out;
5700 }
5701 base = bucket_block(xbs->bucket, block_off);
5702 vb.vb_bh = xbs->bucket->bu_bhs[block_off];
5703 vb.vb_access = ocfs2_journal_access;
5704
5705 if (ocfs2_meta_ecc(osb)) {
5706 /*create parameters for ocfs2_post_refcount. */
5707 bucket = xbs->bucket;
5708 refcount.credits = bucket->bu_blocks;
5709 refcount.para = bucket;
5710 refcount.func =
5711 ocfs2_xattr_bucket_post_refcount;
5712 p = &refcount;
5713 }
5714 } else {
5715 base = xbs->base;
5716 vb.vb_bh = xbs->xattr_bh;
5717 vb.vb_access = ocfs2_journal_access_xb;
5718 }
5719 }
5720
5721 if (ocfs2_xattr_is_local(xe))
5722 goto out;
5723
5724 vb.vb_xv = (struct ocfs2_xattr_value_root *)
5725 (base + name_offset + name_len);
5726
5727 ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
5728 &num_clusters, &vb.vb_xv->xr_list,
5729 &ext_flags);
5730 if (ret) {
5731 mlog_errno(ret);
5732 goto out;
5733 }
5734
5735 /*
5736 * We just need to check the 1st extent record, since we always
5737 * CoW the whole xattr. So there shouldn't be a xattr with
5738 * some REFCOUNT extent recs after the 1st one.
5739 */
5740 if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
5741 goto out;
5742
5743 ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
5744 1, ref_tree, &ref_root_bh);
5745 if (ret) {
5746 mlog_errno(ret);
5747 goto out;
5748 }
5749
5750 /*
5751 * If we are deleting the xattr or the new size will be stored inside,
5752 * cool, leave it there, the xattr truncate process will remove them
5753 * for us(it still needs the refcount tree lock and the meta, credits).
5754 * And the worse case is that every cluster truncate will split the
5755 * refcount tree, and make the original extent become 3. So we will need
5756 * 2 * cluster more extent recs at most.
5757 */
5758 if (!xi->xi_value || xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE) {
5759
5760 ret = ocfs2_refcounted_xattr_delete_need(inode,
5761 &(*ref_tree)->rf_ci,
5762 ref_root_bh, vb.vb_xv,
5763 meta_add, credits);
5764 if (ret)
5765 mlog_errno(ret);
5766 goto out;
5767 }
5768
5769 ret = ocfs2_refcount_cow_xattr(inode, di, &vb,
5770 *ref_tree, ref_root_bh, 0,
5771 le32_to_cpu(vb.vb_xv->xr_clusters), p);
5772 if (ret)
5773 mlog_errno(ret);
5774
5775 out:
5776 brelse(ref_root_bh);
5777 return ret;
5778 }
5779
5780 /*
5781 * Add the REFCOUNTED flags for all the extent rec in ocfs2_xattr_value_root.
5782 * The physical clusters will be added to refcount tree.
5783 */
5784 static int ocfs2_xattr_value_attach_refcount(struct inode *inode,
5785 struct ocfs2_xattr_value_root *xv,
5786 struct ocfs2_extent_tree *value_et,
5787 struct ocfs2_caching_info *ref_ci,
5788 struct buffer_head *ref_root_bh,
5789 struct ocfs2_cached_dealloc_ctxt *dealloc,
5790 struct ocfs2_post_refcount *refcount)
5791 {
5792 int ret = 0;
5793 u32 clusters = le32_to_cpu(xv->xr_clusters);
5794 u32 cpos, p_cluster, num_clusters;
5795 struct ocfs2_extent_list *el = &xv->xr_list;
5796 unsigned int ext_flags;
5797
5798 cpos = 0;
5799 while (cpos < clusters) {
5800 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
5801 &num_clusters, el, &ext_flags);
5802
5803 cpos += num_clusters;
5804 if ((ext_flags & OCFS2_EXT_REFCOUNTED))
5805 continue;
5806
5807 BUG_ON(!p_cluster);
5808
5809 ret = ocfs2_add_refcount_flag(inode, value_et,
5810 ref_ci, ref_root_bh,
5811 cpos - num_clusters,
5812 p_cluster, num_clusters,
5813 dealloc, refcount);
5814 if (ret) {
5815 mlog_errno(ret);
5816 break;
5817 }
5818 }
5819
5820 return ret;
5821 }
5822
5823 /*
5824 * Given a normal ocfs2_xattr_header, refcount all the entries which
5825 * have value stored outside.
5826 * Used for xattrs stored in inode and ocfs2_xattr_block.
5827 */
5828 static int ocfs2_xattr_attach_refcount_normal(struct inode *inode,
5829 struct ocfs2_xattr_value_buf *vb,
5830 struct ocfs2_xattr_header *header,
5831 struct ocfs2_caching_info *ref_ci,
5832 struct buffer_head *ref_root_bh,
5833 struct ocfs2_cached_dealloc_ctxt *dealloc)
5834 {
5835
5836 struct ocfs2_xattr_entry *xe;
5837 struct ocfs2_xattr_value_root *xv;
5838 struct ocfs2_extent_tree et;
5839 int i, ret = 0;
5840
5841 for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
5842 xe = &header->xh_entries[i];
5843
5844 if (ocfs2_xattr_is_local(xe))
5845 continue;
5846
5847 xv = (struct ocfs2_xattr_value_root *)((void *)header +
5848 le16_to_cpu(xe->xe_name_offset) +
5849 OCFS2_XATTR_SIZE(xe->xe_name_len));
5850
5851 vb->vb_xv = xv;
5852 ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
5853
5854 ret = ocfs2_xattr_value_attach_refcount(inode, xv, &et,
5855 ref_ci, ref_root_bh,
5856 dealloc, NULL);
5857 if (ret) {
5858 mlog_errno(ret);
5859 break;
5860 }
5861 }
5862
5863 return ret;
5864 }
5865
5866 static int ocfs2_xattr_inline_attach_refcount(struct inode *inode,
5867 struct buffer_head *fe_bh,
5868 struct ocfs2_caching_info *ref_ci,
5869 struct buffer_head *ref_root_bh,
5870 struct ocfs2_cached_dealloc_ctxt *dealloc)
5871 {
5872 struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
5873 struct ocfs2_xattr_header *header = (struct ocfs2_xattr_header *)
5874 (fe_bh->b_data + inode->i_sb->s_blocksize -
5875 le16_to_cpu(di->i_xattr_inline_size));
5876 struct ocfs2_xattr_value_buf vb = {
5877 .vb_bh = fe_bh,
5878 .vb_access = ocfs2_journal_access_di,
5879 };
5880
5881 return ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
5882 ref_ci, ref_root_bh, dealloc);
5883 }
5884
5885 struct ocfs2_xattr_tree_value_refcount_para {
5886 struct ocfs2_caching_info *ref_ci;
5887 struct buffer_head *ref_root_bh;
5888 struct ocfs2_cached_dealloc_ctxt *dealloc;
5889 };
5890
5891 static int ocfs2_get_xattr_tree_value_root(struct super_block *sb,
5892 struct ocfs2_xattr_bucket *bucket,
5893 int offset,
5894 struct ocfs2_xattr_value_root **xv,
5895 struct buffer_head **bh)
5896 {
5897 int ret, block_off, name_offset;
5898 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5899 struct ocfs2_xattr_entry *xe = &xh->xh_entries[offset];
5900 void *base;
5901
5902 ret = ocfs2_xattr_bucket_get_name_value(sb,
5903 bucket_xh(bucket),
5904 offset,
5905 &block_off,
5906 &name_offset);
5907 if (ret) {
5908 mlog_errno(ret);
5909 goto out;
5910 }
5911
5912 base = bucket_block(bucket, block_off);
5913
5914 *xv = (struct ocfs2_xattr_value_root *)(base + name_offset +
5915 OCFS2_XATTR_SIZE(xe->xe_name_len));
5916
5917 if (bh)
5918 *bh = bucket->bu_bhs[block_off];
5919 out:
5920 return ret;
5921 }
5922
5923 /*
5924 * For a given xattr bucket, refcount all the entries which
5925 * have value stored outside.
5926 */
5927 static int ocfs2_xattr_bucket_value_refcount(struct inode *inode,
5928 struct ocfs2_xattr_bucket *bucket,
5929 void *para)
5930 {
5931 int i, ret = 0;
5932 struct ocfs2_extent_tree et;
5933 struct ocfs2_xattr_tree_value_refcount_para *ref =
5934 (struct ocfs2_xattr_tree_value_refcount_para *)para;
5935 struct ocfs2_xattr_header *xh =
5936 (struct ocfs2_xattr_header *)bucket->bu_bhs[0]->b_data;
5937 struct ocfs2_xattr_entry *xe;
5938 struct ocfs2_xattr_value_buf vb = {
5939 .vb_access = ocfs2_journal_access,
5940 };
5941 struct ocfs2_post_refcount refcount = {
5942 .credits = bucket->bu_blocks,
5943 .para = bucket,
5944 .func = ocfs2_xattr_bucket_post_refcount,
5945 };
5946 struct ocfs2_post_refcount *p = NULL;
5947
5948 /* We only need post_refcount if we support metaecc. */
5949 if (ocfs2_meta_ecc(OCFS2_SB(inode->i_sb)))
5950 p = &refcount;
5951
5952 mlog(0, "refcount bucket %llu, count = %u\n",
5953 (unsigned long long)bucket_blkno(bucket),
5954 le16_to_cpu(xh->xh_count));
5955 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
5956 xe = &xh->xh_entries[i];
5957
5958 if (ocfs2_xattr_is_local(xe))
5959 continue;
5960
5961 ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket, i,
5962 &vb.vb_xv, &vb.vb_bh);
5963 if (ret) {
5964 mlog_errno(ret);
5965 break;
5966 }
5967
5968 ocfs2_init_xattr_value_extent_tree(&et,
5969 INODE_CACHE(inode), &vb);
5970
5971 ret = ocfs2_xattr_value_attach_refcount(inode, vb.vb_xv,
5972 &et, ref->ref_ci,
5973 ref->ref_root_bh,
5974 ref->dealloc, p);
5975 if (ret) {
5976 mlog_errno(ret);
5977 break;
5978 }
5979 }
5980
5981 return ret;
5982
5983 }
5984
5985 static int ocfs2_refcount_xattr_tree_rec(struct inode *inode,
5986 struct buffer_head *root_bh,
5987 u64 blkno, u32 cpos, u32 len, void *para)
5988 {
5989 return ocfs2_iterate_xattr_buckets(inode, blkno, len,
5990 ocfs2_xattr_bucket_value_refcount,
5991 para);
5992 }
5993
5994 static int ocfs2_xattr_block_attach_refcount(struct inode *inode,
5995 struct buffer_head *blk_bh,
5996 struct ocfs2_caching_info *ref_ci,
5997 struct buffer_head *ref_root_bh,
5998 struct ocfs2_cached_dealloc_ctxt *dealloc)
5999 {
6000 int ret = 0;
6001 struct ocfs2_xattr_block *xb =
6002 (struct ocfs2_xattr_block *)blk_bh->b_data;
6003
6004 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
6005 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
6006 struct ocfs2_xattr_value_buf vb = {
6007 .vb_bh = blk_bh,
6008 .vb_access = ocfs2_journal_access_xb,
6009 };
6010
6011 ret = ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
6012 ref_ci, ref_root_bh,
6013 dealloc);
6014 } else {
6015 struct ocfs2_xattr_tree_value_refcount_para para = {
6016 .ref_ci = ref_ci,
6017 .ref_root_bh = ref_root_bh,
6018 .dealloc = dealloc,
6019 };
6020
6021 ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
6022 ocfs2_refcount_xattr_tree_rec,
6023 &para);
6024 }
6025
6026 return ret;
6027 }
6028
6029 int ocfs2_xattr_attach_refcount_tree(struct inode *inode,
6030 struct buffer_head *fe_bh,
6031 struct ocfs2_caching_info *ref_ci,
6032 struct buffer_head *ref_root_bh,
6033 struct ocfs2_cached_dealloc_ctxt *dealloc)
6034 {
6035 int ret = 0;
6036 struct ocfs2_inode_info *oi = OCFS2_I(inode);
6037 struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
6038 struct buffer_head *blk_bh = NULL;
6039
6040 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
6041 ret = ocfs2_xattr_inline_attach_refcount(inode, fe_bh,
6042 ref_ci, ref_root_bh,
6043 dealloc);
6044 if (ret) {
6045 mlog_errno(ret);
6046 goto out;
6047 }
6048 }
6049
6050 if (!di->i_xattr_loc)
6051 goto out;
6052
6053 ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
6054 &blk_bh);
6055 if (ret < 0) {
6056 mlog_errno(ret);
6057 goto out;
6058 }
6059
6060 ret = ocfs2_xattr_block_attach_refcount(inode, blk_bh, ref_ci,
6061 ref_root_bh, dealloc);
6062 if (ret)
6063 mlog_errno(ret);
6064
6065 brelse(blk_bh);
6066 out:
6067
6068 return ret;
6069 }
6070
6071 typedef int (should_xattr_reflinked)(struct ocfs2_xattr_entry *xe);
6072 /*
6073 * Store the information we need in xattr reflink.
6074 * old_bh and new_bh are inode bh for the old and new inode.
6075 */
6076 struct ocfs2_xattr_reflink {
6077 struct inode *old_inode;
6078 struct inode *new_inode;
6079 struct buffer_head *old_bh;
6080 struct buffer_head *new_bh;
6081 struct ocfs2_caching_info *ref_ci;
6082 struct buffer_head *ref_root_bh;
6083 struct ocfs2_cached_dealloc_ctxt *dealloc;
6084 should_xattr_reflinked *xattr_reflinked;
6085 };
6086
6087 /*
6088 * Given a xattr header and xe offset,
6089 * return the proper xv and the corresponding bh.
6090 * xattr in inode, block and xattr tree have different implementaions.
6091 */
6092 typedef int (get_xattr_value_root)(struct super_block *sb,
6093 struct buffer_head *bh,
6094 struct ocfs2_xattr_header *xh,
6095 int offset,
6096 struct ocfs2_xattr_value_root **xv,
6097 struct buffer_head **ret_bh,
6098 void *para);
6099
6100 /*
6101 * Calculate all the xattr value root metadata stored in this xattr header and
6102 * credits we need if we create them from the scratch.
6103 * We use get_xattr_value_root so that all types of xattr container can use it.
6104 */
6105 static int ocfs2_value_metas_in_xattr_header(struct super_block *sb,
6106 struct buffer_head *bh,
6107 struct ocfs2_xattr_header *xh,
6108 int *metas, int *credits,
6109 int *num_recs,
6110 get_xattr_value_root *func,
6111 void *para)
6112 {
6113 int i, ret = 0;
6114 struct ocfs2_xattr_value_root *xv;
6115 struct ocfs2_xattr_entry *xe;
6116
6117 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
6118 xe = &xh->xh_entries[i];
6119 if (ocfs2_xattr_is_local(xe))
6120 continue;
6121
6122 ret = func(sb, bh, xh, i, &xv, NULL, para);
6123 if (ret) {
6124 mlog_errno(ret);
6125 break;
6126 }
6127
6128 *metas += le16_to_cpu(xv->xr_list.l_tree_depth) *
6129 le16_to_cpu(xv->xr_list.l_next_free_rec);
6130
6131 *credits += ocfs2_calc_extend_credits(sb,
6132 &def_xv.xv.xr_list,
6133 le32_to_cpu(xv->xr_clusters));
6134
6135 /*
6136 * If the value is a tree with depth > 1, We don't go deep
6137 * to the extent block, so just calculate a maximum record num.
6138 */
6139 if (!xv->xr_list.l_tree_depth)
6140 *num_recs += le16_to_cpu(xv->xr_list.l_next_free_rec);
6141 else
6142 *num_recs += ocfs2_clusters_for_bytes(sb,
6143 XATTR_SIZE_MAX);
6144 }
6145
6146 return ret;
6147 }
6148
6149 /* Used by xattr inode and block to return the right xv and buffer_head. */
6150 static int ocfs2_get_xattr_value_root(struct super_block *sb,
6151 struct buffer_head *bh,
6152 struct ocfs2_xattr_header *xh,
6153 int offset,
6154 struct ocfs2_xattr_value_root **xv,
6155 struct buffer_head **ret_bh,
6156 void *para)
6157 {
6158 struct ocfs2_xattr_entry *xe = &xh->xh_entries[offset];
6159
6160 *xv = (struct ocfs2_xattr_value_root *)((void *)xh +
6161 le16_to_cpu(xe->xe_name_offset) +
6162 OCFS2_XATTR_SIZE(xe->xe_name_len));
6163
6164 if (ret_bh)
6165 *ret_bh = bh;
6166
6167 return 0;
6168 }
6169
6170 /*
6171 * Lock the meta_ac and caculate how much credits we need for reflink xattrs.
6172 * It is only used for inline xattr and xattr block.
6173 */
6174 static int ocfs2_reflink_lock_xattr_allocators(struct ocfs2_super *osb,
6175 struct ocfs2_xattr_header *xh,
6176 struct buffer_head *ref_root_bh,
6177 int *credits,
6178 struct ocfs2_alloc_context **meta_ac)
6179 {
6180 int ret, meta_add = 0, num_recs = 0;
6181 struct ocfs2_refcount_block *rb =
6182 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
6183
6184 *credits = 0;
6185
6186 ret = ocfs2_value_metas_in_xattr_header(osb->sb, NULL, xh,
6187 &meta_add, credits, &num_recs,
6188 ocfs2_get_xattr_value_root,
6189 NULL);
6190 if (ret) {
6191 mlog_errno(ret);
6192 goto out;
6193 }
6194
6195 /*
6196 * We need to add/modify num_recs in refcount tree, so just calculate
6197 * an approximate number we need for refcount tree change.
6198 * Sometimes we need to split the tree, and after split, half recs
6199 * will be moved to the new block, and a new block can only provide
6200 * half number of recs. So we multiple new blocks by 2.
6201 */
6202 num_recs = num_recs / ocfs2_refcount_recs_per_rb(osb->sb) * 2;
6203 meta_add += num_recs;
6204 *credits += num_recs + num_recs * OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
6205 if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
6206 *credits += le16_to_cpu(rb->rf_list.l_tree_depth) *
6207 le16_to_cpu(rb->rf_list.l_next_free_rec) + 1;
6208 else
6209 *credits += 1;
6210
6211 ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add, meta_ac);
6212 if (ret)
6213 mlog_errno(ret);
6214
6215 out:
6216 return ret;
6217 }
6218
6219 /*
6220 * Given a xattr header, reflink all the xattrs in this container.
6221 * It can be used for inode, block and bucket.
6222 *
6223 * NOTE:
6224 * Before we call this function, the caller has memcpy the xattr in
6225 * old_xh to the new_xh.
6226 *
6227 * If args.xattr_reflinked is set, call it to decide whether the xe should
6228 * be reflinked or not. If not, remove it from the new xattr header.
6229 */
6230 static int ocfs2_reflink_xattr_header(handle_t *handle,
6231 struct ocfs2_xattr_reflink *args,
6232 struct buffer_head *old_bh,
6233 struct ocfs2_xattr_header *xh,
6234 struct buffer_head *new_bh,
6235 struct ocfs2_xattr_header *new_xh,
6236 struct ocfs2_xattr_value_buf *vb,
6237 struct ocfs2_alloc_context *meta_ac,
6238 get_xattr_value_root *func,
6239 void *para)
6240 {
6241 int ret = 0, i, j;
6242 struct super_block *sb = args->old_inode->i_sb;
6243 struct buffer_head *value_bh;
6244 struct ocfs2_xattr_entry *xe, *last;
6245 struct ocfs2_xattr_value_root *xv, *new_xv;
6246 struct ocfs2_extent_tree data_et;
6247 u32 clusters, cpos, p_cluster, num_clusters;
6248 unsigned int ext_flags = 0;
6249
6250 mlog(0, "reflink xattr in container %llu, count = %u\n",
6251 (unsigned long long)old_bh->b_blocknr, le16_to_cpu(xh->xh_count));
6252
6253 last = &new_xh->xh_entries[le16_to_cpu(new_xh->xh_count)];
6254 for (i = 0, j = 0; i < le16_to_cpu(xh->xh_count); i++, j++) {
6255 xe = &xh->xh_entries[i];
6256
6257 if (args->xattr_reflinked && !args->xattr_reflinked(xe)) {
6258 xe = &new_xh->xh_entries[j];
6259
6260 le16_add_cpu(&new_xh->xh_count, -1);
6261 if (new_xh->xh_count) {
6262 memmove(xe, xe + 1,
6263 (void *)last - (void *)xe);
6264 memset(last, 0,
6265 sizeof(struct ocfs2_xattr_entry));
6266 }
6267
6268 /*
6269 * We don't want j to increase in the next round since
6270 * it is already moved ahead.
6271 */
6272 j--;
6273 continue;
6274 }
6275
6276 if (ocfs2_xattr_is_local(xe))
6277 continue;
6278
6279 ret = func(sb, old_bh, xh, i, &xv, NULL, para);
6280 if (ret) {
6281 mlog_errno(ret);
6282 break;
6283 }
6284
6285 ret = func(sb, new_bh, new_xh, j, &new_xv, &value_bh, para);
6286 if (ret) {
6287 mlog_errno(ret);
6288 break;
6289 }
6290
6291 /*
6292 * For the xattr which has l_tree_depth = 0, all the extent
6293 * recs have already be copied to the new xh with the
6294 * propriate OCFS2_EXT_REFCOUNTED flag we just need to
6295 * increase the refount count int the refcount tree.
6296 *
6297 * For the xattr which has l_tree_depth > 0, we need
6298 * to initialize it to the empty default value root,
6299 * and then insert the extents one by one.
6300 */
6301 if (xv->xr_list.l_tree_depth) {
6302 memcpy(new_xv, &def_xv, sizeof(def_xv));
6303 vb->vb_xv = new_xv;
6304 vb->vb_bh = value_bh;
6305 ocfs2_init_xattr_value_extent_tree(&data_et,
6306 INODE_CACHE(args->new_inode), vb);
6307 }
6308
6309 clusters = le32_to_cpu(xv->xr_clusters);
6310 cpos = 0;
6311 while (cpos < clusters) {
6312 ret = ocfs2_xattr_get_clusters(args->old_inode,
6313 cpos,
6314 &p_cluster,
6315 &num_clusters,
6316 &xv->xr_list,
6317 &ext_flags);
6318 if (ret) {
6319 mlog_errno(ret);
6320 goto out;
6321 }
6322
6323 BUG_ON(!p_cluster);
6324
6325 if (xv->xr_list.l_tree_depth) {
6326 ret = ocfs2_insert_extent(handle,
6327 &data_et, cpos,
6328 ocfs2_clusters_to_blocks(
6329 args->old_inode->i_sb,
6330 p_cluster),
6331 num_clusters, ext_flags,
6332 meta_ac);
6333 if (ret) {
6334 mlog_errno(ret);
6335 goto out;
6336 }
6337 }
6338
6339 ret = ocfs2_increase_refcount(handle, args->ref_ci,
6340 args->ref_root_bh,
6341 p_cluster, num_clusters,
6342 meta_ac, args->dealloc);
6343 if (ret) {
6344 mlog_errno(ret);
6345 goto out;
6346 }
6347
6348 cpos += num_clusters;
6349 }
6350 }
6351
6352 out:
6353 return ret;
6354 }
6355
6356 static int ocfs2_reflink_xattr_inline(struct ocfs2_xattr_reflink *args)
6357 {
6358 int ret = 0, credits = 0;
6359 handle_t *handle;
6360 struct ocfs2_super *osb = OCFS2_SB(args->old_inode->i_sb);
6361 struct ocfs2_dinode *di = (struct ocfs2_dinode *)args->old_bh->b_data;
6362 int inline_size = le16_to_cpu(di->i_xattr_inline_size);
6363 int header_off = osb->sb->s_blocksize - inline_size;
6364 struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)
6365 (args->old_bh->b_data + header_off);
6366 struct ocfs2_xattr_header *new_xh = (struct ocfs2_xattr_header *)
6367 (args->new_bh->b_data + header_off);
6368 struct ocfs2_alloc_context *meta_ac = NULL;
6369 struct ocfs2_inode_info *new_oi;
6370 struct ocfs2_dinode *new_di;
6371 struct ocfs2_xattr_value_buf vb = {
6372 .vb_bh = args->new_bh,
6373 .vb_access = ocfs2_journal_access_di,
6374 };
6375
6376 ret = ocfs2_reflink_lock_xattr_allocators(osb, xh, args->ref_root_bh,
6377 &credits, &meta_ac);
6378 if (ret) {
6379 mlog_errno(ret);
6380 goto out;
6381 }
6382
6383 handle = ocfs2_start_trans(osb, credits);
6384 if (IS_ERR(handle)) {
6385 ret = PTR_ERR(handle);
6386 mlog_errno(ret);
6387 goto out;
6388 }
6389
6390 ret = ocfs2_journal_access_di(handle, INODE_CACHE(args->new_inode),
6391 args->new_bh, OCFS2_JOURNAL_ACCESS_WRITE);
6392 if (ret) {
6393 mlog_errno(ret);
6394 goto out_commit;
6395 }
6396
6397 memcpy(args->new_bh->b_data + header_off,
6398 args->old_bh->b_data + header_off, inline_size);
6399
6400 new_di = (struct ocfs2_dinode *)args->new_bh->b_data;
6401 new_di->i_xattr_inline_size = cpu_to_le16(inline_size);
6402
6403 ret = ocfs2_reflink_xattr_header(handle, args, args->old_bh, xh,
6404 args->new_bh, new_xh, &vb, meta_ac,
6405 ocfs2_get_xattr_value_root, NULL);
6406 if (ret) {
6407 mlog_errno(ret);
6408 goto out_commit;
6409 }
6410
6411 new_oi = OCFS2_I(args->new_inode);
6412 spin_lock(&new_oi->ip_lock);
6413 new_oi->ip_dyn_features |= OCFS2_HAS_XATTR_FL | OCFS2_INLINE_XATTR_FL;
6414 new_di->i_dyn_features = cpu_to_le16(new_oi->ip_dyn_features);
6415 spin_unlock(&new_oi->ip_lock);
6416
6417 ocfs2_journal_dirty(handle, args->new_bh);
6418
6419 out_commit:
6420 ocfs2_commit_trans(osb, handle);
6421
6422 out:
6423 if (meta_ac)
6424 ocfs2_free_alloc_context(meta_ac);
6425 return ret;
6426 }
6427
6428 static int ocfs2_create_empty_xattr_block(struct inode *inode,
6429 struct buffer_head *fe_bh,
6430 struct buffer_head **ret_bh,
6431 int indexed)
6432 {
6433 int ret;
6434 struct ocfs2_alloc_context *meta_ac;
6435 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
6436 struct ocfs2_xattr_set_ctxt ctxt = {
6437 .meta_ac = meta_ac,
6438 };
6439
6440 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
6441 if (ret < 0) {
6442 mlog_errno(ret);
6443 return ret;
6444 }
6445
6446 ctxt.handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_CREATE_CREDITS);
6447 if (IS_ERR(ctxt.handle)) {
6448 ret = PTR_ERR(ctxt.handle);
6449 mlog_errno(ret);
6450 goto out;
6451 }
6452
6453 mlog(0, "create new xattr block for inode %llu, index = %d\n",
6454 (unsigned long long)fe_bh->b_blocknr, indexed);
6455 ret = ocfs2_create_xattr_block(inode, fe_bh, &ctxt, indexed,
6456 ret_bh);
6457 if (ret)
6458 mlog_errno(ret);
6459
6460 ocfs2_commit_trans(osb, ctxt.handle);
6461 out:
6462 ocfs2_free_alloc_context(meta_ac);
6463 return ret;
6464 }
6465
6466 static int ocfs2_reflink_xattr_block(struct ocfs2_xattr_reflink *args,
6467 struct buffer_head *blk_bh,
6468 struct buffer_head *new_blk_bh)
6469 {
6470 int ret = 0, credits = 0;
6471 handle_t *handle;
6472 struct ocfs2_inode_info *new_oi = OCFS2_I(args->new_inode);
6473 struct ocfs2_dinode *new_di;
6474 struct ocfs2_super *osb = OCFS2_SB(args->new_inode->i_sb);
6475 int header_off = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
6476 struct ocfs2_xattr_block *xb =
6477 (struct ocfs2_xattr_block *)blk_bh->b_data;
6478 struct ocfs2_xattr_header *xh = &xb->xb_attrs.xb_header;
6479 struct ocfs2_xattr_block *new_xb =
6480 (struct ocfs2_xattr_block *)new_blk_bh->b_data;
6481 struct ocfs2_xattr_header *new_xh = &new_xb->xb_attrs.xb_header;
6482 struct ocfs2_alloc_context *meta_ac;
6483 struct ocfs2_xattr_value_buf vb = {
6484 .vb_bh = new_blk_bh,
6485 .vb_access = ocfs2_journal_access_xb,
6486 };
6487
6488 ret = ocfs2_reflink_lock_xattr_allocators(osb, xh, args->ref_root_bh,
6489 &credits, &meta_ac);
6490 if (ret) {
6491 mlog_errno(ret);
6492 return ret;
6493 }
6494
6495 /* One more credits in case we need to add xattr flags in new inode. */
6496 handle = ocfs2_start_trans(osb, credits + 1);
6497 if (IS_ERR(handle)) {
6498 ret = PTR_ERR(handle);
6499 mlog_errno(ret);
6500 goto out;
6501 }
6502
6503 if (!(new_oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) {
6504 ret = ocfs2_journal_access_di(handle,
6505 INODE_CACHE(args->new_inode),
6506 args->new_bh,
6507 OCFS2_JOURNAL_ACCESS_WRITE);
6508 if (ret) {
6509 mlog_errno(ret);
6510 goto out_commit;
6511 }
6512 }
6513
6514 ret = ocfs2_journal_access_xb(handle, INODE_CACHE(args->new_inode),
6515 new_blk_bh, OCFS2_JOURNAL_ACCESS_WRITE);
6516 if (ret) {
6517 mlog_errno(ret);
6518 goto out_commit;
6519 }
6520
6521 memcpy(new_blk_bh->b_data + header_off, blk_bh->b_data + header_off,
6522 osb->sb->s_blocksize - header_off);
6523
6524 ret = ocfs2_reflink_xattr_header(handle, args, blk_bh, xh,
6525 new_blk_bh, new_xh, &vb, meta_ac,
6526 ocfs2_get_xattr_value_root, NULL);
6527 if (ret) {
6528 mlog_errno(ret);
6529 goto out_commit;
6530 }
6531
6532 ocfs2_journal_dirty(handle, new_blk_bh);
6533
6534 if (!(new_oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) {
6535 new_di = (struct ocfs2_dinode *)args->new_bh->b_data;
6536 spin_lock(&new_oi->ip_lock);
6537 new_oi->ip_dyn_features |= OCFS2_HAS_XATTR_FL;
6538 new_di->i_dyn_features = cpu_to_le16(new_oi->ip_dyn_features);
6539 spin_unlock(&new_oi->ip_lock);
6540
6541 ocfs2_journal_dirty(handle, args->new_bh);
6542 }
6543
6544 out_commit:
6545 ocfs2_commit_trans(osb, handle);
6546
6547 out:
6548 ocfs2_free_alloc_context(meta_ac);
6549 return ret;
6550 }
6551
6552 struct ocfs2_reflink_xattr_tree_args {
6553 struct ocfs2_xattr_reflink *reflink;
6554 struct buffer_head *old_blk_bh;
6555 struct buffer_head *new_blk_bh;
6556 struct ocfs2_xattr_bucket *old_bucket;
6557 struct ocfs2_xattr_bucket *new_bucket;
6558 };
6559
6560 /*
6561 * NOTE:
6562 * We have to handle the case that both old bucket and new bucket
6563 * will call this function to get the right ret_bh.
6564 * So The caller must give us the right bh.
6565 */
6566 static int ocfs2_get_reflink_xattr_value_root(struct super_block *sb,
6567 struct buffer_head *bh,
6568 struct ocfs2_xattr_header *xh,
6569 int offset,
6570 struct ocfs2_xattr_value_root **xv,
6571 struct buffer_head **ret_bh,
6572 void *para)
6573 {
6574 struct ocfs2_reflink_xattr_tree_args *args =
6575 (struct ocfs2_reflink_xattr_tree_args *)para;
6576 struct ocfs2_xattr_bucket *bucket;
6577
6578 if (bh == args->old_bucket->bu_bhs[0])
6579 bucket = args->old_bucket;
6580 else
6581 bucket = args->new_bucket;
6582
6583 return ocfs2_get_xattr_tree_value_root(sb, bucket, offset,
6584 xv, ret_bh);
6585 }
6586
6587 struct ocfs2_value_tree_metas {
6588 int num_metas;
6589 int credits;
6590 int num_recs;
6591 };
6592
6593 static int ocfs2_value_tree_metas_in_bucket(struct super_block *sb,
6594 struct buffer_head *bh,
6595 struct ocfs2_xattr_header *xh,
6596 int offset,
6597 struct ocfs2_xattr_value_root **xv,
6598 struct buffer_head **ret_bh,
6599 void *para)
6600 {
6601 struct ocfs2_xattr_bucket *bucket =
6602 (struct ocfs2_xattr_bucket *)para;
6603
6604 return ocfs2_get_xattr_tree_value_root(sb, bucket, offset,
6605 xv, ret_bh);
6606 }
6607
6608 static int ocfs2_calc_value_tree_metas(struct inode *inode,
6609 struct ocfs2_xattr_bucket *bucket,
6610 void *para)
6611 {
6612 struct ocfs2_value_tree_metas *metas =
6613 (struct ocfs2_value_tree_metas *)para;
6614 struct ocfs2_xattr_header *xh =
6615 (struct ocfs2_xattr_header *)bucket->bu_bhs[0]->b_data;
6616
6617 /* Add the credits for this bucket first. */
6618 metas->credits += bucket->bu_blocks;
6619 return ocfs2_value_metas_in_xattr_header(inode->i_sb, bucket->bu_bhs[0],
6620 xh, &metas->num_metas,
6621 &metas->credits, &metas->num_recs,
6622 ocfs2_value_tree_metas_in_bucket,
6623 bucket);
6624 }
6625
6626 /*
6627 * Given a xattr extent rec starting from blkno and having len clusters,
6628 * iterate all the buckets calculate how much metadata we need for reflinking
6629 * all the ocfs2_xattr_value_root and lock the allocators accordingly.
6630 */
6631 static int ocfs2_lock_reflink_xattr_rec_allocators(
6632 struct ocfs2_reflink_xattr_tree_args *args,
6633 struct ocfs2_extent_tree *xt_et,
6634 u64 blkno, u32 len, int *credits,
6635 struct ocfs2_alloc_context **meta_ac,
6636 struct ocfs2_alloc_context **data_ac)
6637 {
6638 int ret, num_free_extents;
6639 struct ocfs2_value_tree_metas metas;
6640 struct ocfs2_super *osb = OCFS2_SB(args->reflink->old_inode->i_sb);
6641 struct ocfs2_refcount_block *rb;
6642
6643 memset(&metas, 0, sizeof(metas));
6644
6645 ret = ocfs2_iterate_xattr_buckets(args->reflink->old_inode, blkno, len,
6646 ocfs2_calc_value_tree_metas, &metas);
6647 if (ret) {
6648 mlog_errno(ret);
6649 goto out;
6650 }
6651
6652 *credits = metas.credits;
6653
6654 /*
6655 * Calculate we need for refcount tree change.
6656 *
6657 * We need to add/modify num_recs in refcount tree, so just calculate
6658 * an approximate number we need for refcount tree change.
6659 * Sometimes we need to split the tree, and after split, half recs
6660 * will be moved to the new block, and a new block can only provide
6661 * half number of recs. So we multiple new blocks by 2.
6662 * In the end, we have to add credits for modifying the already
6663 * existed refcount block.
6664 */
6665 rb = (struct ocfs2_refcount_block *)args->reflink->ref_root_bh->b_data;
6666 metas.num_recs =
6667 (metas.num_recs + ocfs2_refcount_recs_per_rb(osb->sb) - 1) /
6668 ocfs2_refcount_recs_per_rb(osb->sb) * 2;
6669 metas.num_metas += metas.num_recs;
6670 *credits += metas.num_recs +
6671 metas.num_recs * OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
6672 if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
6673 *credits += le16_to_cpu(rb->rf_list.l_tree_depth) *
6674 le16_to_cpu(rb->rf_list.l_next_free_rec) + 1;
6675 else
6676 *credits += 1;
6677
6678 /* count in the xattr tree change. */
6679 num_free_extents = ocfs2_num_free_extents(osb, xt_et);
6680 if (num_free_extents < 0) {
6681 ret = num_free_extents;
6682 mlog_errno(ret);
6683 goto out;
6684 }
6685
6686 if (num_free_extents < len)
6687 metas.num_metas += ocfs2_extend_meta_needed(xt_et->et_root_el);
6688
6689 *credits += ocfs2_calc_extend_credits(osb->sb,
6690 xt_et->et_root_el, len);
6691
6692 if (metas.num_metas) {
6693 ret = ocfs2_reserve_new_metadata_blocks(osb, metas.num_metas,
6694 meta_ac);
6695 if (ret) {
6696 mlog_errno(ret);
6697 goto out;
6698 }
6699 }
6700
6701 if (len) {
6702 ret = ocfs2_reserve_clusters(osb, len, data_ac);
6703 if (ret)
6704 mlog_errno(ret);
6705 }
6706 out:
6707 if (ret) {
6708 if (*meta_ac) {
6709 ocfs2_free_alloc_context(*meta_ac);
6710 meta_ac = NULL;
6711 }
6712 }
6713
6714 return ret;
6715 }
6716
6717 static int ocfs2_reflink_xattr_buckets(handle_t *handle,
6718 u64 blkno, u64 new_blkno, u32 clusters,
6719 struct ocfs2_alloc_context *meta_ac,
6720 struct ocfs2_alloc_context *data_ac,
6721 struct ocfs2_reflink_xattr_tree_args *args)
6722 {
6723 int i, j, ret = 0;
6724 struct super_block *sb = args->reflink->old_inode->i_sb;
6725 u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(sb));
6726 u32 num_buckets = clusters * bpc;
6727 int bpb = args->old_bucket->bu_blocks;
6728 struct ocfs2_xattr_value_buf vb = {
6729 .vb_access = ocfs2_journal_access,
6730 };
6731
6732 for (i = 0; i < num_buckets; i++, blkno += bpb, new_blkno += bpb) {
6733 ret = ocfs2_read_xattr_bucket(args->old_bucket, blkno);
6734 if (ret) {
6735 mlog_errno(ret);
6736 break;
6737 }
6738
6739 ret = ocfs2_init_xattr_bucket(args->new_bucket, new_blkno);
6740 if (ret) {
6741 mlog_errno(ret);
6742 break;
6743 }
6744
6745 /*
6746 * The real bucket num in this series of blocks is stored
6747 * in the 1st bucket.
6748 */
6749 if (i == 0)
6750 num_buckets = le16_to_cpu(
6751 bucket_xh(args->old_bucket)->xh_num_buckets);
6752
6753 ret = ocfs2_xattr_bucket_journal_access(handle,
6754 args->new_bucket,
6755 OCFS2_JOURNAL_ACCESS_CREATE);
6756 if (ret) {
6757 mlog_errno(ret);
6758 break;
6759 }
6760
6761 for (j = 0; j < bpb; j++)
6762 memcpy(bucket_block(args->new_bucket, j),
6763 bucket_block(args->old_bucket, j),
6764 sb->s_blocksize);
6765
6766 ocfs2_xattr_bucket_journal_dirty(handle, args->new_bucket);
6767
6768 ret = ocfs2_reflink_xattr_header(handle, args->reflink,
6769 args->old_bucket->bu_bhs[0],
6770 bucket_xh(args->old_bucket),
6771 args->new_bucket->bu_bhs[0],
6772 bucket_xh(args->new_bucket),
6773 &vb, meta_ac,
6774 ocfs2_get_reflink_xattr_value_root,
6775 args);
6776 if (ret) {
6777 mlog_errno(ret);
6778 break;
6779 }
6780
6781 /*
6782 * Re-access and dirty the bucket to calculate metaecc.
6783 * Because we may extend the transaction in reflink_xattr_header
6784 * which will let the already accessed block gone.
6785 */
6786 ret = ocfs2_xattr_bucket_journal_access(handle,
6787 args->new_bucket,
6788 OCFS2_JOURNAL_ACCESS_WRITE);
6789 if (ret) {
6790 mlog_errno(ret);
6791 break;
6792 }
6793
6794 ocfs2_xattr_bucket_journal_dirty(handle, args->new_bucket);
6795 ocfs2_xattr_bucket_relse(args->old_bucket);
6796 ocfs2_xattr_bucket_relse(args->new_bucket);
6797 }
6798
6799 ocfs2_xattr_bucket_relse(args->old_bucket);
6800 ocfs2_xattr_bucket_relse(args->new_bucket);
6801 return ret;
6802 }
6803 /*
6804 * Create the same xattr extent record in the new inode's xattr tree.
6805 */
6806 static int ocfs2_reflink_xattr_rec(struct inode *inode,
6807 struct buffer_head *root_bh,
6808 u64 blkno,
6809 u32 cpos,
6810 u32 len,
6811 void *para)
6812 {
6813 int ret, credits = 0;
6814 u32 p_cluster, num_clusters;
6815 u64 new_blkno;
6816 handle_t *handle;
6817 struct ocfs2_reflink_xattr_tree_args *args =
6818 (struct ocfs2_reflink_xattr_tree_args *)para;
6819 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
6820 struct ocfs2_alloc_context *meta_ac = NULL;
6821 struct ocfs2_alloc_context *data_ac = NULL;
6822 struct ocfs2_extent_tree et;
6823
6824 ocfs2_init_xattr_tree_extent_tree(&et,
6825 INODE_CACHE(args->reflink->new_inode),
6826 args->new_blk_bh);
6827
6828 ret = ocfs2_lock_reflink_xattr_rec_allocators(args, &et, blkno,
6829 len, &credits,
6830 &meta_ac, &data_ac);
6831 if (ret) {
6832 mlog_errno(ret);
6833 goto out;
6834 }
6835
6836 handle = ocfs2_start_trans(osb, credits);
6837 if (IS_ERR(handle)) {
6838 ret = PTR_ERR(handle);
6839 mlog_errno(ret);
6840 goto out;
6841 }
6842
6843 ret = ocfs2_claim_clusters(osb, handle, data_ac,
6844 len, &p_cluster, &num_clusters);
6845 if (ret) {
6846 mlog_errno(ret);
6847 goto out_commit;
6848 }
6849
6850 new_blkno = ocfs2_clusters_to_blocks(osb->sb, p_cluster);
6851
6852 mlog(0, "reflink xattr buckets %llu to %llu, len %u\n",
6853 (unsigned long long)blkno, (unsigned long long)new_blkno, len);
6854 ret = ocfs2_reflink_xattr_buckets(handle, blkno, new_blkno, len,
6855 meta_ac, data_ac, args);
6856 if (ret) {
6857 mlog_errno(ret);
6858 goto out_commit;
6859 }
6860
6861 mlog(0, "insert new xattr extent rec start %llu len %u to %u\n",
6862 (unsigned long long)new_blkno, len, cpos);
6863 ret = ocfs2_insert_extent(handle, &et, cpos, new_blkno,
6864 len, 0, meta_ac);
6865 if (ret)
6866 mlog_errno(ret);
6867
6868 out_commit:
6869 ocfs2_commit_trans(osb, handle);
6870
6871 out:
6872 if (meta_ac)
6873 ocfs2_free_alloc_context(meta_ac);
6874 if (data_ac)
6875 ocfs2_free_alloc_context(data_ac);
6876 return ret;
6877 }
6878
6879 /*
6880 * Create reflinked xattr buckets.
6881 * We will add bucket one by one, and refcount all the xattrs in the bucket
6882 * if they are stored outside.
6883 */
6884 static int ocfs2_reflink_xattr_tree(struct ocfs2_xattr_reflink *args,
6885 struct buffer_head *blk_bh,
6886 struct buffer_head *new_blk_bh)
6887 {
6888 int ret;
6889 struct ocfs2_reflink_xattr_tree_args para;
6890
6891 memset(&para, 0, sizeof(para));
6892 para.reflink = args;
6893 para.old_blk_bh = blk_bh;
6894 para.new_blk_bh = new_blk_bh;
6895
6896 para.old_bucket = ocfs2_xattr_bucket_new(args->old_inode);
6897 if (!para.old_bucket) {
6898 mlog_errno(-ENOMEM);
6899 return -ENOMEM;
6900 }
6901
6902 para.new_bucket = ocfs2_xattr_bucket_new(args->new_inode);
6903 if (!para.new_bucket) {
6904 ret = -ENOMEM;
6905 mlog_errno(ret);
6906 goto out;
6907 }
6908
6909 ret = ocfs2_iterate_xattr_index_block(args->old_inode, blk_bh,
6910 ocfs2_reflink_xattr_rec,
6911 &para);
6912 if (ret)
6913 mlog_errno(ret);
6914
6915 out:
6916 ocfs2_xattr_bucket_free(para.old_bucket);
6917 ocfs2_xattr_bucket_free(para.new_bucket);
6918 return ret;
6919 }
6920
6921 static int ocfs2_reflink_xattr_in_block(struct ocfs2_xattr_reflink *args,
6922 struct buffer_head *blk_bh)
6923 {
6924 int ret, indexed = 0;
6925 struct buffer_head *new_blk_bh = NULL;
6926 struct ocfs2_xattr_block *xb =
6927 (struct ocfs2_xattr_block *)blk_bh->b_data;
6928
6929
6930 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)
6931 indexed = 1;
6932
6933 ret = ocfs2_create_empty_xattr_block(args->new_inode, args->new_bh,
6934 &new_blk_bh, indexed);
6935 if (ret) {
6936 mlog_errno(ret);
6937 goto out;
6938 }
6939
6940 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED))
6941 ret = ocfs2_reflink_xattr_block(args, blk_bh, new_blk_bh);
6942 else
6943 ret = ocfs2_reflink_xattr_tree(args, blk_bh, new_blk_bh);
6944 if (ret)
6945 mlog_errno(ret);
6946
6947 out:
6948 brelse(new_blk_bh);
6949 return ret;
6950 }
6951
6952 static int ocfs2_reflink_xattr_no_security(struct ocfs2_xattr_entry *xe)
6953 {
6954 int type = ocfs2_xattr_get_type(xe);
6955
6956 return type != OCFS2_XATTR_INDEX_SECURITY &&
6957 type != OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS &&
6958 type != OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
6959 }
6960
6961 int ocfs2_reflink_xattrs(struct inode *old_inode,
6962 struct buffer_head *old_bh,
6963 struct inode *new_inode,
6964 struct buffer_head *new_bh,
6965 bool preserve_security)
6966 {
6967 int ret;
6968 struct ocfs2_xattr_reflink args;
6969 struct ocfs2_inode_info *oi = OCFS2_I(old_inode);
6970 struct ocfs2_dinode *di = (struct ocfs2_dinode *)old_bh->b_data;
6971 struct buffer_head *blk_bh = NULL;
6972 struct ocfs2_cached_dealloc_ctxt dealloc;
6973 struct ocfs2_refcount_tree *ref_tree;
6974 struct buffer_head *ref_root_bh = NULL;
6975
6976 ret = ocfs2_lock_refcount_tree(OCFS2_SB(old_inode->i_sb),
6977 le64_to_cpu(di->i_refcount_loc),
6978 1, &ref_tree, &ref_root_bh);
6979 if (ret) {
6980 mlog_errno(ret);
6981 goto out;
6982 }
6983
6984 ocfs2_init_dealloc_ctxt(&dealloc);
6985
6986 args.old_inode = old_inode;
6987 args.new_inode = new_inode;
6988 args.old_bh = old_bh;
6989 args.new_bh = new_bh;
6990 args.ref_ci = &ref_tree->rf_ci;
6991 args.ref_root_bh = ref_root_bh;
6992 args.dealloc = &dealloc;
6993 if (preserve_security)
6994 args.xattr_reflinked = NULL;
6995 else
6996 args.xattr_reflinked = ocfs2_reflink_xattr_no_security;
6997
6998 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
6999 ret = ocfs2_reflink_xattr_inline(&args);
7000 if (ret) {
7001 mlog_errno(ret);
7002 goto out_unlock;
7003 }
7004 }
7005
7006 if (!di->i_xattr_loc)
7007 goto out_unlock;
7008
7009 ret = ocfs2_read_xattr_block(old_inode, le64_to_cpu(di->i_xattr_loc),
7010 &blk_bh);
7011 if (ret < 0) {
7012 mlog_errno(ret);
7013 goto out_unlock;
7014 }
7015
7016 ret = ocfs2_reflink_xattr_in_block(&args, blk_bh);
7017 if (ret)
7018 mlog_errno(ret);
7019
7020 brelse(blk_bh);
7021
7022 out_unlock:
7023 ocfs2_unlock_refcount_tree(OCFS2_SB(old_inode->i_sb),
7024 ref_tree, 1);
7025 brelse(ref_root_bh);
7026
7027 if (ocfs2_dealloc_has_cluster(&dealloc)) {
7028 ocfs2_schedule_truncate_log_flush(OCFS2_SB(old_inode->i_sb), 1);
7029 ocfs2_run_deallocs(OCFS2_SB(old_inode->i_sb), &dealloc);
7030 }
7031
7032 out:
7033 return ret;
7034 }
7035
7036 /*
7037 * Initialize security and acl for a already created inode.
7038 * Used for reflink a non-preserve-security file.
7039 *
7040 * It uses common api like ocfs2_xattr_set, so the caller
7041 * must not hold any lock expect i_mutex.
7042 */
7043 int ocfs2_init_security_and_acl(struct inode *dir,
7044 struct inode *inode)
7045 {
7046 int ret = 0;
7047 struct buffer_head *dir_bh = NULL;
7048 struct ocfs2_security_xattr_info si = {
7049 .enable = 1,
7050 };
7051
7052 ret = ocfs2_init_security_get(inode, dir, &si);
7053 if (!ret) {
7054 ret = ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_SECURITY,
7055 si.name, si.value, si.value_len,
7056 XATTR_CREATE);
7057 if (ret) {
7058 mlog_errno(ret);
7059 goto leave;
7060 }
7061 } else if (ret != -EOPNOTSUPP) {
7062 mlog_errno(ret);
7063 goto leave;
7064 }
7065
7066 ret = ocfs2_inode_lock(dir, &dir_bh, 0);
7067 if (ret) {
7068 mlog_errno(ret);
7069 goto leave;
7070 }
7071
7072 ret = ocfs2_init_acl(NULL, inode, dir, NULL, dir_bh, NULL, NULL);
7073 if (ret)
7074 mlog_errno(ret);
7075
7076 ocfs2_inode_unlock(dir, 0);
7077 brelse(dir_bh);
7078 leave:
7079 return ret;
7080 }
7081 /*
7082 * 'security' attributes support
7083 */
7084 static size_t ocfs2_xattr_security_list(struct dentry *dentry, char *list,
7085 size_t list_size, const char *name,
7086 size_t name_len, int type)
7087 {
7088 const size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
7089 const size_t total_len = prefix_len + name_len + 1;
7090
7091 if (list && total_len <= list_size) {
7092 memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
7093 memcpy(list + prefix_len, name, name_len);
7094 list[prefix_len + name_len] = '\0';
7095 }
7096 return total_len;
7097 }
7098
7099 static int ocfs2_xattr_security_get(struct dentry *dentry, const char *name,
7100 void *buffer, size_t size, int type)
7101 {
7102 if (strcmp(name, "") == 0)
7103 return -EINVAL;
7104 return ocfs2_xattr_get(dentry->d_inode, OCFS2_XATTR_INDEX_SECURITY,
7105 name, buffer, size);
7106 }
7107
7108 static int ocfs2_xattr_security_set(struct dentry *dentry, const char *name,
7109 const void *value, size_t size, int flags, int type)
7110 {
7111 if (strcmp(name, "") == 0)
7112 return -EINVAL;
7113
7114 return ocfs2_xattr_set(dentry->d_inode, OCFS2_XATTR_INDEX_SECURITY,
7115 name, value, size, flags);
7116 }
7117
7118 int ocfs2_init_security_get(struct inode *inode,
7119 struct inode *dir,
7120 struct ocfs2_security_xattr_info *si)
7121 {
7122 /* check whether ocfs2 support feature xattr */
7123 if (!ocfs2_supports_xattr(OCFS2_SB(dir->i_sb)))
7124 return -EOPNOTSUPP;
7125 return security_inode_init_security(inode, dir, &si->name, &si->value,
7126 &si->value_len);
7127 }
7128
7129 int ocfs2_init_security_set(handle_t *handle,
7130 struct inode *inode,
7131 struct buffer_head *di_bh,
7132 struct ocfs2_security_xattr_info *si,
7133 struct ocfs2_alloc_context *xattr_ac,
7134 struct ocfs2_alloc_context *data_ac)
7135 {
7136 return ocfs2_xattr_set_handle(handle, inode, di_bh,
7137 OCFS2_XATTR_INDEX_SECURITY,
7138 si->name, si->value, si->value_len, 0,
7139 xattr_ac, data_ac);
7140 }
7141
7142 struct xattr_handler ocfs2_xattr_security_handler = {
7143 .prefix = XATTR_SECURITY_PREFIX,
7144 .list = ocfs2_xattr_security_list,
7145 .get = ocfs2_xattr_security_get,
7146 .set = ocfs2_xattr_security_set,
7147 };
7148
7149 /*
7150 * 'trusted' attributes support
7151 */
7152 static size_t ocfs2_xattr_trusted_list(struct dentry *dentry, char *list,
7153 size_t list_size, const char *name,
7154 size_t name_len, int type)
7155 {
7156 const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
7157 const size_t total_len = prefix_len + name_len + 1;
7158
7159 if (list && total_len <= list_size) {
7160 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
7161 memcpy(list + prefix_len, name, name_len);
7162 list[prefix_len + name_len] = '\0';
7163 }
7164 return total_len;
7165 }
7166
7167 static int ocfs2_xattr_trusted_get(struct dentry *dentry, const char *name,
7168 void *buffer, size_t size, int type)
7169 {
7170 if (strcmp(name, "") == 0)
7171 return -EINVAL;
7172 return ocfs2_xattr_get(dentry->d_inode, OCFS2_XATTR_INDEX_TRUSTED,
7173 name, buffer, size);
7174 }
7175
7176 static int ocfs2_xattr_trusted_set(struct dentry *dentry, const char *name,
7177 const void *value, size_t size, int flags, int type)
7178 {
7179 if (strcmp(name, "") == 0)
7180 return -EINVAL;
7181
7182 return ocfs2_xattr_set(dentry->d_inode, OCFS2_XATTR_INDEX_TRUSTED,
7183 name, value, size, flags);
7184 }
7185
7186 struct xattr_handler ocfs2_xattr_trusted_handler = {
7187 .prefix = XATTR_TRUSTED_PREFIX,
7188 .list = ocfs2_xattr_trusted_list,
7189 .get = ocfs2_xattr_trusted_get,
7190 .set = ocfs2_xattr_trusted_set,
7191 };
7192
7193 /*
7194 * 'user' attributes support
7195 */
7196 static size_t ocfs2_xattr_user_list(struct dentry *dentry, char *list,
7197 size_t list_size, const char *name,
7198 size_t name_len, int type)
7199 {
7200 const size_t prefix_len = XATTR_USER_PREFIX_LEN;
7201 const size_t total_len = prefix_len + name_len + 1;
7202 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7203
7204 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7205 return 0;
7206
7207 if (list && total_len <= list_size) {
7208 memcpy(list, XATTR_USER_PREFIX, prefix_len);
7209 memcpy(list + prefix_len, name, name_len);
7210 list[prefix_len + name_len] = '\0';
7211 }
7212 return total_len;
7213 }
7214
7215 static int ocfs2_xattr_user_get(struct dentry *dentry, const char *name,
7216 void *buffer, size_t size, int type)
7217 {
7218 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7219
7220 if (strcmp(name, "") == 0)
7221 return -EINVAL;
7222 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7223 return -EOPNOTSUPP;
7224 return ocfs2_xattr_get(dentry->d_inode, OCFS2_XATTR_INDEX_USER, name,
7225 buffer, size);
7226 }
7227
7228 static int ocfs2_xattr_user_set(struct dentry *dentry, const char *name,
7229 const void *value, size_t size, int flags, int type)
7230 {
7231 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7232
7233 if (strcmp(name, "") == 0)
7234 return -EINVAL;
7235 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7236 return -EOPNOTSUPP;
7237
7238 return ocfs2_xattr_set(dentry->d_inode, OCFS2_XATTR_INDEX_USER,
7239 name, value, size, flags);
7240 }
7241
7242 struct xattr_handler ocfs2_xattr_user_handler = {
7243 .prefix = XATTR_USER_PREFIX,
7244 .list = ocfs2_xattr_user_list,
7245 .get = ocfs2_xattr_user_get,
7246 .set = ocfs2_xattr_user_set,
7247 };
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree