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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / fs / ocfs2 / xattr.c
blob7d3d979f57d9142169f93f2c88b27a612dc06dc4
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 #include <cluster/masklog.h>
41
42 #include "ocfs2.h"
43 #include "alloc.h"
44 #include "blockcheck.h"
45 #include "dlmglue.h"
46 #include "file.h"
47 #include "symlink.h"
48 #include "sysfile.h"
49 #include "inode.h"
50 #include "journal.h"
51 #include "ocfs2_fs.h"
52 #include "suballoc.h"
53 #include "uptodate.h"
54 #include "buffer_head_io.h"
55 #include "super.h"
56 #include "xattr.h"
57 #include "refcounttree.h"
58 #include "acl.h"
59 #include "ocfs2_trace.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 int set_abort;
83 };
84
85 #define OCFS2_XATTR_ROOT_SIZE (sizeof(struct ocfs2_xattr_def_value_root))
86 #define OCFS2_XATTR_INLINE_SIZE 80
87 #define OCFS2_XATTR_HEADER_GAP 4
88 #define OCFS2_XATTR_FREE_IN_IBODY (OCFS2_MIN_XATTR_INLINE_SIZE \
89 - sizeof(struct ocfs2_xattr_header) \
90 - OCFS2_XATTR_HEADER_GAP)
91 #define OCFS2_XATTR_FREE_IN_BLOCK(ptr) ((ptr)->i_sb->s_blocksize \
92 - sizeof(struct ocfs2_xattr_block) \
93 - sizeof(struct ocfs2_xattr_header) \
94 - OCFS2_XATTR_HEADER_GAP)
95
96 static struct ocfs2_xattr_def_value_root def_xv = {
97 .xv.xr_list.l_count = cpu_to_le16(1),
98 };
99
100 const struct xattr_handler *ocfs2_xattr_handlers[] = {
101 &ocfs2_xattr_user_handler,
102 &posix_acl_access_xattr_handler,
103 &posix_acl_default_xattr_handler,
104 &ocfs2_xattr_trusted_handler,
105 &ocfs2_xattr_security_handler,
106 NULL
107 };
108
109 static const struct xattr_handler *ocfs2_xattr_handler_map[OCFS2_XATTR_MAX] = {
110 [OCFS2_XATTR_INDEX_USER] = &ocfs2_xattr_user_handler,
111 [OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS]
112 = &posix_acl_access_xattr_handler,
113 [OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT]
114 = &posix_acl_default_xattr_handler,
115 [OCFS2_XATTR_INDEX_TRUSTED] = &ocfs2_xattr_trusted_handler,
116 [OCFS2_XATTR_INDEX_SECURITY] = &ocfs2_xattr_security_handler,
117 };
118
119 struct ocfs2_xattr_info {
120 int xi_name_index;
121 const char *xi_name;
122 int xi_name_len;
123 const void *xi_value;
124 size_t xi_value_len;
125 };
126
127 struct ocfs2_xattr_search {
128 struct buffer_head *inode_bh;
129 /*
130 * xattr_bh point to the block buffer head which has extended attribute
131 * when extended attribute in inode, xattr_bh is equal to inode_bh.
132 */
133 struct buffer_head *xattr_bh;
134 struct ocfs2_xattr_header *header;
135 struct ocfs2_xattr_bucket *bucket;
136 void *base;
137 void *end;
138 struct ocfs2_xattr_entry *here;
139 int not_found;
140 };
141
142 /* Operations on struct ocfs2_xa_entry */
143 struct ocfs2_xa_loc;
144 struct ocfs2_xa_loc_operations {
145 /*
146 * Journal functions
147 */
148 int (*xlo_journal_access)(handle_t *handle, struct ocfs2_xa_loc *loc,
149 int type);
150 void (*xlo_journal_dirty)(handle_t *handle, struct ocfs2_xa_loc *loc);
151
152 /*
153 * Return a pointer to the appropriate buffer in loc->xl_storage
154 * at the given offset from loc->xl_header.
155 */
156 void *(*xlo_offset_pointer)(struct ocfs2_xa_loc *loc, int offset);
157
158 /* Can we reuse the existing entry for the new value? */
159 int (*xlo_can_reuse)(struct ocfs2_xa_loc *loc,
160 struct ocfs2_xattr_info *xi);
161
162 /* How much space is needed for the new value? */
163 int (*xlo_check_space)(struct ocfs2_xa_loc *loc,
164 struct ocfs2_xattr_info *xi);
165
166 /*
167 * Return the offset of the first name+value pair. This is
168 * the start of our downward-filling free space.
169 */
170 int (*xlo_get_free_start)(struct ocfs2_xa_loc *loc);
171
172 /*
173 * Remove the name+value at this location. Do whatever is
174 * appropriate with the remaining name+value pairs.
175 */
176 void (*xlo_wipe_namevalue)(struct ocfs2_xa_loc *loc);
177
178 /* Fill xl_entry with a new entry */
179 void (*xlo_add_entry)(struct ocfs2_xa_loc *loc, u32 name_hash);
180
181 /* Add name+value storage to an entry */
182 void (*xlo_add_namevalue)(struct ocfs2_xa_loc *loc, int size);
183
184 /*
185 * Initialize the value buf's access and bh fields for this entry.
186 * ocfs2_xa_fill_value_buf() will handle the xv pointer.
187 */
188 void (*xlo_fill_value_buf)(struct ocfs2_xa_loc *loc,
189 struct ocfs2_xattr_value_buf *vb);
190 };
191
192 /*
193 * Describes an xattr entry location. This is a memory structure
194 * tracking the on-disk structure.
195 */
196 struct ocfs2_xa_loc {
197 /* This xattr belongs to this inode */
198 struct inode *xl_inode;
199
200 /* The ocfs2_xattr_header inside the on-disk storage. Not NULL. */
201 struct ocfs2_xattr_header *xl_header;
202
203 /* Bytes from xl_header to the end of the storage */
204 int xl_size;
205
206 /*
207 * The ocfs2_xattr_entry this location describes. If this is
208 * NULL, this location describes the on-disk structure where it
209 * would have been.
210 */
211 struct ocfs2_xattr_entry *xl_entry;
212
213 /*
214 * Internal housekeeping
215 */
216
217 /* Buffer(s) containing this entry */
218 void *xl_storage;
219
220 /* Operations on the storage backing this location */
221 const struct ocfs2_xa_loc_operations *xl_ops;
222 };
223
224 /*
225 * Convenience functions to calculate how much space is needed for a
226 * given name+value pair
227 */
228 static int namevalue_size(int name_len, uint64_t value_len)
229 {
230 if (value_len > OCFS2_XATTR_INLINE_SIZE)
231 return OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
232 else
233 return OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(value_len);
234 }
235
236 static int namevalue_size_xi(struct ocfs2_xattr_info *xi)
237 {
238 return namevalue_size(xi->xi_name_len, xi->xi_value_len);
239 }
240
241 static int namevalue_size_xe(struct ocfs2_xattr_entry *xe)
242 {
243 u64 value_len = le64_to_cpu(xe->xe_value_size);
244
245 BUG_ON((value_len > OCFS2_XATTR_INLINE_SIZE) &&
246 ocfs2_xattr_is_local(xe));
247 return namevalue_size(xe->xe_name_len, value_len);
248 }
249
250
251 static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
252 struct ocfs2_xattr_header *xh,
253 int index,
254 int *block_off,
255 int *new_offset);
256
257 static int ocfs2_xattr_block_find(struct inode *inode,
258 int name_index,
259 const char *name,
260 struct ocfs2_xattr_search *xs);
261 static int ocfs2_xattr_index_block_find(struct inode *inode,
262 struct buffer_head *root_bh,
263 int name_index,
264 const char *name,
265 struct ocfs2_xattr_search *xs);
266
267 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
268 struct buffer_head *blk_bh,
269 char *buffer,
270 size_t buffer_size);
271
272 static int ocfs2_xattr_create_index_block(struct inode *inode,
273 struct ocfs2_xattr_search *xs,
274 struct ocfs2_xattr_set_ctxt *ctxt);
275
276 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
277 struct ocfs2_xattr_info *xi,
278 struct ocfs2_xattr_search *xs,
279 struct ocfs2_xattr_set_ctxt *ctxt);
280
281 typedef int (xattr_tree_rec_func)(struct inode *inode,
282 struct buffer_head *root_bh,
283 u64 blkno, u32 cpos, u32 len, void *para);
284 static int ocfs2_iterate_xattr_index_block(struct inode *inode,
285 struct buffer_head *root_bh,
286 xattr_tree_rec_func *rec_func,
287 void *para);
288 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
289 struct ocfs2_xattr_bucket *bucket,
290 void *para);
291 static int ocfs2_rm_xattr_cluster(struct inode *inode,
292 struct buffer_head *root_bh,
293 u64 blkno,
294 u32 cpos,
295 u32 len,
296 void *para);
297
298 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
299 u64 src_blk, u64 last_blk, u64 to_blk,
300 unsigned int start_bucket,
301 u32 *first_hash);
302 static int ocfs2_prepare_refcount_xattr(struct inode *inode,
303 struct ocfs2_dinode *di,
304 struct ocfs2_xattr_info *xi,
305 struct ocfs2_xattr_search *xis,
306 struct ocfs2_xattr_search *xbs,
307 struct ocfs2_refcount_tree **ref_tree,
308 int *meta_need,
309 int *credits);
310 static int ocfs2_get_xattr_tree_value_root(struct super_block *sb,
311 struct ocfs2_xattr_bucket *bucket,
312 int offset,
313 struct ocfs2_xattr_value_root **xv,
314 struct buffer_head **bh);
315
316 static inline u16 ocfs2_xattr_buckets_per_cluster(struct ocfs2_super *osb)
317 {
318 return (1 << osb->s_clustersize_bits) / OCFS2_XATTR_BUCKET_SIZE;
319 }
320
321 static inline u16 ocfs2_blocks_per_xattr_bucket(struct super_block *sb)
322 {
323 return OCFS2_XATTR_BUCKET_SIZE / (1 << sb->s_blocksize_bits);
324 }
325
326 #define bucket_blkno(_b) ((_b)->bu_bhs[0]->b_blocknr)
327 #define bucket_block(_b, _n) ((_b)->bu_bhs[(_n)]->b_data)
328 #define bucket_xh(_b) ((struct ocfs2_xattr_header *)bucket_block((_b), 0))
329
330 static struct ocfs2_xattr_bucket *ocfs2_xattr_bucket_new(struct inode *inode)
331 {
332 struct ocfs2_xattr_bucket *bucket;
333 int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
334
335 BUG_ON(blks > OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET);
336
337 bucket = kzalloc(sizeof(struct ocfs2_xattr_bucket), GFP_NOFS);
338 if (bucket) {
339 bucket->bu_inode = inode;
340 bucket->bu_blocks = blks;
341 }
342
343 return bucket;
344 }
345
346 static void ocfs2_xattr_bucket_relse(struct ocfs2_xattr_bucket *bucket)
347 {
348 int i;
349
350 for (i = 0; i < bucket->bu_blocks; i++) {
351 brelse(bucket->bu_bhs[i]);
352 bucket->bu_bhs[i] = NULL;
353 }
354 }
355
356 static void ocfs2_xattr_bucket_free(struct ocfs2_xattr_bucket *bucket)
357 {
358 if (bucket) {
359 ocfs2_xattr_bucket_relse(bucket);
360 bucket->bu_inode = NULL;
361 kfree(bucket);
362 }
363 }
364
365 /*
366 * A bucket that has never been written to disk doesn't need to be
367 * read. We just need the buffer_heads. Don't call this for
368 * buckets that are already on disk. ocfs2_read_xattr_bucket() initializes
369 * them fully.
370 */
371 static int ocfs2_init_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
372 u64 xb_blkno, int new)
373 {
374 int i, rc = 0;
375
376 for (i = 0; i < bucket->bu_blocks; i++) {
377 bucket->bu_bhs[i] = sb_getblk(bucket->bu_inode->i_sb,
378 xb_blkno + i);
379 if (!bucket->bu_bhs[i]) {
380 rc = -ENOMEM;
381 mlog_errno(rc);
382 break;
383 }
384
385 if (!ocfs2_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
386 bucket->bu_bhs[i])) {
387 if (new)
388 ocfs2_set_new_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
389 bucket->bu_bhs[i]);
390 else {
391 set_buffer_uptodate(bucket->bu_bhs[i]);
392 ocfs2_set_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
393 bucket->bu_bhs[i]);
394 }
395 }
396 }
397
398 if (rc)
399 ocfs2_xattr_bucket_relse(bucket);
400 return rc;
401 }
402
403 /* Read the xattr bucket at xb_blkno */
404 static int ocfs2_read_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
405 u64 xb_blkno)
406 {
407 int rc;
408
409 rc = ocfs2_read_blocks(INODE_CACHE(bucket->bu_inode), xb_blkno,
410 bucket->bu_blocks, bucket->bu_bhs, 0,
411 NULL);
412 if (!rc) {
413 spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
414 rc = ocfs2_validate_meta_ecc_bhs(bucket->bu_inode->i_sb,
415 bucket->bu_bhs,
416 bucket->bu_blocks,
417 &bucket_xh(bucket)->xh_check);
418 spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
419 if (rc)
420 mlog_errno(rc);
421 }
422
423 if (rc)
424 ocfs2_xattr_bucket_relse(bucket);
425 return rc;
426 }
427
428 static int ocfs2_xattr_bucket_journal_access(handle_t *handle,
429 struct ocfs2_xattr_bucket *bucket,
430 int type)
431 {
432 int i, rc = 0;
433
434 for (i = 0; i < bucket->bu_blocks; i++) {
435 rc = ocfs2_journal_access(handle,
436 INODE_CACHE(bucket->bu_inode),
437 bucket->bu_bhs[i], type);
438 if (rc) {
439 mlog_errno(rc);
440 break;
441 }
442 }
443
444 return rc;
445 }
446
447 static void ocfs2_xattr_bucket_journal_dirty(handle_t *handle,
448 struct ocfs2_xattr_bucket *bucket)
449 {
450 int i;
451
452 spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
453 ocfs2_compute_meta_ecc_bhs(bucket->bu_inode->i_sb,
454 bucket->bu_bhs, bucket->bu_blocks,
455 &bucket_xh(bucket)->xh_check);
456 spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
457
458 for (i = 0; i < bucket->bu_blocks; i++)
459 ocfs2_journal_dirty(handle, bucket->bu_bhs[i]);
460 }
461
462 static void ocfs2_xattr_bucket_copy_data(struct ocfs2_xattr_bucket *dest,
463 struct ocfs2_xattr_bucket *src)
464 {
465 int i;
466 int blocksize = src->bu_inode->i_sb->s_blocksize;
467
468 BUG_ON(dest->bu_blocks != src->bu_blocks);
469 BUG_ON(dest->bu_inode != src->bu_inode);
470
471 for (i = 0; i < src->bu_blocks; i++) {
472 memcpy(bucket_block(dest, i), bucket_block(src, i),
473 blocksize);
474 }
475 }
476
477 static int ocfs2_validate_xattr_block(struct super_block *sb,
478 struct buffer_head *bh)
479 {
480 int rc;
481 struct ocfs2_xattr_block *xb =
482 (struct ocfs2_xattr_block *)bh->b_data;
483
484 trace_ocfs2_validate_xattr_block((unsigned long long)bh->b_blocknr);
485
486 BUG_ON(!buffer_uptodate(bh));
487
488 /*
489 * If the ecc fails, we return the error but otherwise
490 * leave the filesystem running. We know any error is
491 * local to this block.
492 */
493 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &xb->xb_check);
494 if (rc)
495 return rc;
496
497 /*
498 * Errors after here are fatal
499 */
500
501 if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
502 return ocfs2_error(sb,
503 "Extended attribute block #%llu has bad signature %.*s\n",
504 (unsigned long long)bh->b_blocknr, 7,
505 xb->xb_signature);
506 }
507
508 if (le64_to_cpu(xb->xb_blkno) != bh->b_blocknr) {
509 return ocfs2_error(sb,
510 "Extended attribute block #%llu has an invalid xb_blkno of %llu\n",
511 (unsigned long long)bh->b_blocknr,
512 (unsigned long long)le64_to_cpu(xb->xb_blkno));
513 }
514
515 if (le32_to_cpu(xb->xb_fs_generation) != OCFS2_SB(sb)->fs_generation) {
516 return ocfs2_error(sb,
517 "Extended attribute block #%llu has an invalid xb_fs_generation of #%u\n",
518 (unsigned long long)bh->b_blocknr,
519 le32_to_cpu(xb->xb_fs_generation));
520 }
521
522 return 0;
523 }
524
525 static int ocfs2_read_xattr_block(struct inode *inode, u64 xb_blkno,
526 struct buffer_head **bh)
527 {
528 int rc;
529 struct buffer_head *tmp = *bh;
530
531 rc = ocfs2_read_block(INODE_CACHE(inode), xb_blkno, &tmp,
532 ocfs2_validate_xattr_block);
533
534 /* If ocfs2_read_block() got us a new bh, pass it up. */
535 if (!rc && !*bh)
536 *bh = tmp;
537
538 return rc;
539 }
540
541 static inline const char *ocfs2_xattr_prefix(int name_index)
542 {
543 const struct xattr_handler *handler = NULL;
544
545 if (name_index > 0 && name_index < OCFS2_XATTR_MAX)
546 handler = ocfs2_xattr_handler_map[name_index];
547 return handler ? xattr_prefix(handler) : 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 umode_t 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, credits;
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 ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
718
719 while (clusters_to_add) {
720 trace_ocfs2_xattr_extend_allocation(clusters_to_add);
721
722 status = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
723 OCFS2_JOURNAL_ACCESS_WRITE);
724 if (status < 0) {
725 mlog_errno(status);
726 break;
727 }
728
729 prev_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
730 status = ocfs2_add_clusters_in_btree(handle,
731 &et,
732 &logical_start,
733 clusters_to_add,
734 0,
735 ctxt->data_ac,
736 ctxt->meta_ac,
737 &why);
738 if ((status < 0) && (status != -EAGAIN)) {
739 if (status != -ENOSPC)
740 mlog_errno(status);
741 break;
742 }
743
744 ocfs2_journal_dirty(handle, vb->vb_bh);
745
746 clusters_to_add -= le32_to_cpu(vb->vb_xv->xr_clusters) -
747 prev_clusters;
748
749 if (why != RESTART_NONE && clusters_to_add) {
750 /*
751 * We can only fail in case the alloc file doesn't give
752 * up enough clusters.
753 */
754 BUG_ON(why == RESTART_META);
755
756 credits = ocfs2_calc_extend_credits(inode->i_sb,
757 &vb->vb_xv->xr_list);
758 status = ocfs2_extend_trans(handle, credits);
759 if (status < 0) {
760 status = -ENOMEM;
761 mlog_errno(status);
762 break;
763 }
764 }
765 }
766
767 return status;
768 }
769
770 static int __ocfs2_remove_xattr_range(struct inode *inode,
771 struct ocfs2_xattr_value_buf *vb,
772 u32 cpos, u32 phys_cpos, u32 len,
773 unsigned int ext_flags,
774 struct ocfs2_xattr_set_ctxt *ctxt)
775 {
776 int ret;
777 u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
778 handle_t *handle = ctxt->handle;
779 struct ocfs2_extent_tree et;
780
781 ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
782
783 ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
784 OCFS2_JOURNAL_ACCESS_WRITE);
785 if (ret) {
786 mlog_errno(ret);
787 goto out;
788 }
789
790 ret = ocfs2_remove_extent(handle, &et, cpos, len, ctxt->meta_ac,
791 &ctxt->dealloc);
792 if (ret) {
793 mlog_errno(ret);
794 goto out;
795 }
796
797 le32_add_cpu(&vb->vb_xv->xr_clusters, -len);
798 ocfs2_journal_dirty(handle, vb->vb_bh);
799
800 if (ext_flags & OCFS2_EXT_REFCOUNTED)
801 ret = ocfs2_decrease_refcount(inode, handle,
802 ocfs2_blocks_to_clusters(inode->i_sb,
803 phys_blkno),
804 len, ctxt->meta_ac, &ctxt->dealloc, 1);
805 else
806 ret = ocfs2_cache_cluster_dealloc(&ctxt->dealloc,
807 phys_blkno, len);
808 if (ret)
809 mlog_errno(ret);
810
811 out:
812 return ret;
813 }
814
815 static int ocfs2_xattr_shrink_size(struct inode *inode,
816 u32 old_clusters,
817 u32 new_clusters,
818 struct ocfs2_xattr_value_buf *vb,
819 struct ocfs2_xattr_set_ctxt *ctxt)
820 {
821 int ret = 0;
822 unsigned int ext_flags;
823 u32 trunc_len, cpos, phys_cpos, alloc_size;
824 u64 block;
825
826 if (old_clusters <= new_clusters)
827 return 0;
828
829 cpos = new_clusters;
830 trunc_len = old_clusters - new_clusters;
831 while (trunc_len) {
832 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
833 &alloc_size,
834 &vb->vb_xv->xr_list, &ext_flags);
835 if (ret) {
836 mlog_errno(ret);
837 goto out;
838 }
839
840 if (alloc_size > trunc_len)
841 alloc_size = trunc_len;
842
843 ret = __ocfs2_remove_xattr_range(inode, vb, cpos,
844 phys_cpos, alloc_size,
845 ext_flags, ctxt);
846 if (ret) {
847 mlog_errno(ret);
848 goto out;
849 }
850
851 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
852 ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode),
853 block, alloc_size);
854 cpos += alloc_size;
855 trunc_len -= alloc_size;
856 }
857
858 out:
859 return ret;
860 }
861
862 static int ocfs2_xattr_value_truncate(struct inode *inode,
863 struct ocfs2_xattr_value_buf *vb,
864 int len,
865 struct ocfs2_xattr_set_ctxt *ctxt)
866 {
867 int ret;
868 u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
869 u32 old_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
870
871 if (new_clusters == old_clusters)
872 return 0;
873
874 if (new_clusters > old_clusters)
875 ret = ocfs2_xattr_extend_allocation(inode,
876 new_clusters - old_clusters,
877 vb, ctxt);
878 else
879 ret = ocfs2_xattr_shrink_size(inode,
880 old_clusters, new_clusters,
881 vb, ctxt);
882
883 return ret;
884 }
885
886 static int ocfs2_xattr_list_entry(struct super_block *sb,
887 char *buffer, size_t size,
888 size_t *result, int type,
889 const char *name, int name_len)
890 {
891 char *p = buffer + *result;
892 const char *prefix;
893 int prefix_len;
894 int total_len;
895
896 switch(type) {
897 case OCFS2_XATTR_INDEX_USER:
898 if (OCFS2_SB(sb)->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
899 return 0;
900 break;
901
902 case OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS:
903 case OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT:
904 if (!(sb->s_flags & MS_POSIXACL))
905 return 0;
906 break;
907
908 case OCFS2_XATTR_INDEX_TRUSTED:
909 if (!capable(CAP_SYS_ADMIN))
910 return 0;
911 break;
912 }
913
914 prefix = ocfs2_xattr_prefix(type);
915 if (!prefix)
916 return 0;
917 prefix_len = strlen(prefix);
918 total_len = prefix_len + name_len + 1;
919 *result += total_len;
920
921 /* we are just looking for how big our buffer needs to be */
922 if (!size)
923 return 0;
924
925 if (*result > size)
926 return -ERANGE;
927
928 memcpy(p, prefix, prefix_len);
929 memcpy(p + prefix_len, name, name_len);
930 p[prefix_len + name_len] = '\0';
931
932 return 0;
933 }
934
935 static int ocfs2_xattr_list_entries(struct inode *inode,
936 struct ocfs2_xattr_header *header,
937 char *buffer, size_t buffer_size)
938 {
939 size_t result = 0;
940 int i, type, ret;
941 const char *name;
942
943 for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
944 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
945 type = ocfs2_xattr_get_type(entry);
946 name = (const char *)header +
947 le16_to_cpu(entry->xe_name_offset);
948
949 ret = ocfs2_xattr_list_entry(inode->i_sb,
950 buffer, buffer_size,
951 &result, type, name,
952 entry->xe_name_len);
953 if (ret)
954 return ret;
955 }
956
957 return result;
958 }
959
960 int ocfs2_has_inline_xattr_value_outside(struct inode *inode,
961 struct ocfs2_dinode *di)
962 {
963 struct ocfs2_xattr_header *xh;
964 int i;
965
966 xh = (struct ocfs2_xattr_header *)
967 ((void *)di + inode->i_sb->s_blocksize -
968 le16_to_cpu(di->i_xattr_inline_size));
969
970 for (i = 0; i < le16_to_cpu(xh->xh_count); i++)
971 if (!ocfs2_xattr_is_local(&xh->xh_entries[i]))
972 return 1;
973
974 return 0;
975 }
976
977 static int ocfs2_xattr_ibody_list(struct inode *inode,
978 struct ocfs2_dinode *di,
979 char *buffer,
980 size_t buffer_size)
981 {
982 struct ocfs2_xattr_header *header = NULL;
983 struct ocfs2_inode_info *oi = OCFS2_I(inode);
984 int ret = 0;
985
986 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
987 return ret;
988
989 header = (struct ocfs2_xattr_header *)
990 ((void *)di + inode->i_sb->s_blocksize -
991 le16_to_cpu(di->i_xattr_inline_size));
992
993 ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size);
994
995 return ret;
996 }
997
998 static int ocfs2_xattr_block_list(struct inode *inode,
999 struct ocfs2_dinode *di,
1000 char *buffer,
1001 size_t buffer_size)
1002 {
1003 struct buffer_head *blk_bh = NULL;
1004 struct ocfs2_xattr_block *xb;
1005 int ret = 0;
1006
1007 if (!di->i_xattr_loc)
1008 return ret;
1009
1010 ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
1011 &blk_bh);
1012 if (ret < 0) {
1013 mlog_errno(ret);
1014 return ret;
1015 }
1016
1017 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1018 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
1019 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
1020 ret = ocfs2_xattr_list_entries(inode, header,
1021 buffer, buffer_size);
1022 } else
1023 ret = ocfs2_xattr_tree_list_index_block(inode, blk_bh,
1024 buffer, buffer_size);
1025
1026 brelse(blk_bh);
1027
1028 return ret;
1029 }
1030
1031 ssize_t ocfs2_listxattr(struct dentry *dentry,
1032 char *buffer,
1033 size_t size)
1034 {
1035 int ret = 0, i_ret = 0, b_ret = 0;
1036 struct buffer_head *di_bh = NULL;
1037 struct ocfs2_dinode *di = NULL;
1038 struct ocfs2_inode_info *oi = OCFS2_I(d_inode(dentry));
1039
1040 if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
1041 return -EOPNOTSUPP;
1042
1043 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1044 return ret;
1045
1046 ret = ocfs2_inode_lock(d_inode(dentry), &di_bh, 0);
1047 if (ret < 0) {
1048 mlog_errno(ret);
1049 return ret;
1050 }
1051
1052 di = (struct ocfs2_dinode *)di_bh->b_data;
1053
1054 down_read(&oi->ip_xattr_sem);
1055 i_ret = ocfs2_xattr_ibody_list(d_inode(dentry), di, buffer, size);
1056 if (i_ret < 0)
1057 b_ret = 0;
1058 else {
1059 if (buffer) {
1060 buffer += i_ret;
1061 size -= i_ret;
1062 }
1063 b_ret = ocfs2_xattr_block_list(d_inode(dentry), di,
1064 buffer, size);
1065 if (b_ret < 0)
1066 i_ret = 0;
1067 }
1068 up_read(&oi->ip_xattr_sem);
1069 ocfs2_inode_unlock(d_inode(dentry), 0);
1070
1071 brelse(di_bh);
1072
1073 return i_ret + b_ret;
1074 }
1075
1076 static int ocfs2_xattr_find_entry(int name_index,
1077 const char *name,
1078 struct ocfs2_xattr_search *xs)
1079 {
1080 struct ocfs2_xattr_entry *entry;
1081 size_t name_len;
1082 int i, cmp = 1;
1083
1084 if (name == NULL)
1085 return -EINVAL;
1086
1087 name_len = strlen(name);
1088 entry = xs->here;
1089 for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
1090 cmp = name_index - ocfs2_xattr_get_type(entry);
1091 if (!cmp)
1092 cmp = name_len - entry->xe_name_len;
1093 if (!cmp)
1094 cmp = memcmp(name, (xs->base +
1095 le16_to_cpu(entry->xe_name_offset)),
1096 name_len);
1097 if (cmp == 0)
1098 break;
1099 entry += 1;
1100 }
1101 xs->here = entry;
1102
1103 return cmp ? -ENODATA : 0;
1104 }
1105
1106 static int ocfs2_xattr_get_value_outside(struct inode *inode,
1107 struct ocfs2_xattr_value_root *xv,
1108 void *buffer,
1109 size_t len)
1110 {
1111 u32 cpos, p_cluster, num_clusters, bpc, clusters;
1112 u64 blkno;
1113 int i, ret = 0;
1114 size_t cplen, blocksize;
1115 struct buffer_head *bh = NULL;
1116 struct ocfs2_extent_list *el;
1117
1118 el = &xv->xr_list;
1119 clusters = le32_to_cpu(xv->xr_clusters);
1120 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1121 blocksize = inode->i_sb->s_blocksize;
1122
1123 cpos = 0;
1124 while (cpos < clusters) {
1125 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
1126 &num_clusters, el, NULL);
1127 if (ret) {
1128 mlog_errno(ret);
1129 goto out;
1130 }
1131
1132 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
1133 /* Copy ocfs2_xattr_value */
1134 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1135 ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
1136 &bh, NULL);
1137 if (ret) {
1138 mlog_errno(ret);
1139 goto out;
1140 }
1141
1142 cplen = len >= blocksize ? blocksize : len;
1143 memcpy(buffer, bh->b_data, cplen);
1144 len -= cplen;
1145 buffer += cplen;
1146
1147 brelse(bh);
1148 bh = NULL;
1149 if (len == 0)
1150 break;
1151 }
1152 cpos += num_clusters;
1153 }
1154 out:
1155 return ret;
1156 }
1157
1158 static int ocfs2_xattr_ibody_get(struct inode *inode,
1159 int name_index,
1160 const char *name,
1161 void *buffer,
1162 size_t buffer_size,
1163 struct ocfs2_xattr_search *xs)
1164 {
1165 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1166 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1167 struct ocfs2_xattr_value_root *xv;
1168 size_t size;
1169 int ret = 0;
1170
1171 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
1172 return -ENODATA;
1173
1174 xs->end = (void *)di + inode->i_sb->s_blocksize;
1175 xs->header = (struct ocfs2_xattr_header *)
1176 (xs->end - le16_to_cpu(di->i_xattr_inline_size));
1177 xs->base = (void *)xs->header;
1178 xs->here = xs->header->xh_entries;
1179
1180 ret = ocfs2_xattr_find_entry(name_index, name, xs);
1181 if (ret)
1182 return ret;
1183 size = le64_to_cpu(xs->here->xe_value_size);
1184 if (buffer) {
1185 if (size > buffer_size)
1186 return -ERANGE;
1187 if (ocfs2_xattr_is_local(xs->here)) {
1188 memcpy(buffer, (void *)xs->base +
1189 le16_to_cpu(xs->here->xe_name_offset) +
1190 OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
1191 } else {
1192 xv = (struct ocfs2_xattr_value_root *)
1193 (xs->base + le16_to_cpu(
1194 xs->here->xe_name_offset) +
1195 OCFS2_XATTR_SIZE(xs->here->xe_name_len));
1196 ret = ocfs2_xattr_get_value_outside(inode, xv,
1197 buffer, size);
1198 if (ret < 0) {
1199 mlog_errno(ret);
1200 return ret;
1201 }
1202 }
1203 }
1204
1205 return size;
1206 }
1207
1208 static int ocfs2_xattr_block_get(struct inode *inode,
1209 int name_index,
1210 const char *name,
1211 void *buffer,
1212 size_t buffer_size,
1213 struct ocfs2_xattr_search *xs)
1214 {
1215 struct ocfs2_xattr_block *xb;
1216 struct ocfs2_xattr_value_root *xv;
1217 size_t size;
1218 int ret = -ENODATA, name_offset, name_len, i;
1219 int uninitialized_var(block_off);
1220
1221 xs->bucket = ocfs2_xattr_bucket_new(inode);
1222 if (!xs->bucket) {
1223 ret = -ENOMEM;
1224 mlog_errno(ret);
1225 goto cleanup;
1226 }
1227
1228 ret = ocfs2_xattr_block_find(inode, name_index, name, xs);
1229 if (ret) {
1230 mlog_errno(ret);
1231 goto cleanup;
1232 }
1233
1234 if (xs->not_found) {
1235 ret = -ENODATA;
1236 goto cleanup;
1237 }
1238
1239 xb = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1240 size = le64_to_cpu(xs->here->xe_value_size);
1241 if (buffer) {
1242 ret = -ERANGE;
1243 if (size > buffer_size)
1244 goto cleanup;
1245
1246 name_offset = le16_to_cpu(xs->here->xe_name_offset);
1247 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
1248 i = xs->here - xs->header->xh_entries;
1249
1250 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
1251 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
1252 bucket_xh(xs->bucket),
1253 i,
1254 &block_off,
1255 &name_offset);
1256 if (ret) {
1257 mlog_errno(ret);
1258 goto cleanup;
1259 }
1260 xs->base = bucket_block(xs->bucket, block_off);
1261 }
1262 if (ocfs2_xattr_is_local(xs->here)) {
1263 memcpy(buffer, (void *)xs->base +
1264 name_offset + name_len, size);
1265 } else {
1266 xv = (struct ocfs2_xattr_value_root *)
1267 (xs->base + name_offset + name_len);
1268 ret = ocfs2_xattr_get_value_outside(inode, xv,
1269 buffer, size);
1270 if (ret < 0) {
1271 mlog_errno(ret);
1272 goto cleanup;
1273 }
1274 }
1275 }
1276 ret = size;
1277 cleanup:
1278 ocfs2_xattr_bucket_free(xs->bucket);
1279
1280 brelse(xs->xattr_bh);
1281 xs->xattr_bh = NULL;
1282 return ret;
1283 }
1284
1285 int ocfs2_xattr_get_nolock(struct inode *inode,
1286 struct buffer_head *di_bh,
1287 int name_index,
1288 const char *name,
1289 void *buffer,
1290 size_t buffer_size)
1291 {
1292 int ret;
1293 struct ocfs2_dinode *di = NULL;
1294 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1295 struct ocfs2_xattr_search xis = {
1296 .not_found = -ENODATA,
1297 };
1298 struct ocfs2_xattr_search xbs = {
1299 .not_found = -ENODATA,
1300 };
1301
1302 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1303 return -EOPNOTSUPP;
1304
1305 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1306 return -ENODATA;
1307
1308 xis.inode_bh = xbs.inode_bh = di_bh;
1309 di = (struct ocfs2_dinode *)di_bh->b_data;
1310
1311 ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
1312 buffer_size, &xis);
1313 if (ret == -ENODATA && di->i_xattr_loc)
1314 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
1315 buffer_size, &xbs);
1316
1317 return ret;
1318 }
1319
1320 /* ocfs2_xattr_get()
1321 *
1322 * Copy an extended attribute into the buffer provided.
1323 * Buffer is NULL to compute the size of buffer required.
1324 */
1325 static int ocfs2_xattr_get(struct inode *inode,
1326 int name_index,
1327 const char *name,
1328 void *buffer,
1329 size_t buffer_size)
1330 {
1331 int ret;
1332 struct buffer_head *di_bh = NULL;
1333
1334 ret = ocfs2_inode_lock(inode, &di_bh, 0);
1335 if (ret < 0) {
1336 mlog_errno(ret);
1337 return ret;
1338 }
1339 down_read(&OCFS2_I(inode)->ip_xattr_sem);
1340 ret = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
1341 name, buffer, buffer_size);
1342 up_read(&OCFS2_I(inode)->ip_xattr_sem);
1343
1344 ocfs2_inode_unlock(inode, 0);
1345
1346 brelse(di_bh);
1347
1348 return ret;
1349 }
1350
1351 static int __ocfs2_xattr_set_value_outside(struct inode *inode,
1352 handle_t *handle,
1353 struct ocfs2_xattr_value_buf *vb,
1354 const void *value,
1355 int value_len)
1356 {
1357 int ret = 0, i, cp_len;
1358 u16 blocksize = inode->i_sb->s_blocksize;
1359 u32 p_cluster, num_clusters;
1360 u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1361 u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
1362 u64 blkno;
1363 struct buffer_head *bh = NULL;
1364 unsigned int ext_flags;
1365 struct ocfs2_xattr_value_root *xv = vb->vb_xv;
1366
1367 BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
1368
1369 while (cpos < clusters) {
1370 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
1371 &num_clusters, &xv->xr_list,
1372 &ext_flags);
1373 if (ret) {
1374 mlog_errno(ret);
1375 goto out;
1376 }
1377
1378 BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
1379
1380 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
1381
1382 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1383 ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
1384 &bh, NULL);
1385 if (ret) {
1386 mlog_errno(ret);
1387 goto out;
1388 }
1389
1390 ret = ocfs2_journal_access(handle,
1391 INODE_CACHE(inode),
1392 bh,
1393 OCFS2_JOURNAL_ACCESS_WRITE);
1394 if (ret < 0) {
1395 mlog_errno(ret);
1396 goto out;
1397 }
1398
1399 cp_len = value_len > blocksize ? blocksize : value_len;
1400 memcpy(bh->b_data, value, cp_len);
1401 value_len -= cp_len;
1402 value += cp_len;
1403 if (cp_len < blocksize)
1404 memset(bh->b_data + cp_len, 0,
1405 blocksize - cp_len);
1406
1407 ocfs2_journal_dirty(handle, bh);
1408 brelse(bh);
1409 bh = NULL;
1410
1411 /*
1412 * XXX: do we need to empty all the following
1413 * blocks in this cluster?
1414 */
1415 if (!value_len)
1416 break;
1417 }
1418 cpos += num_clusters;
1419 }
1420 out:
1421 brelse(bh);
1422
1423 return ret;
1424 }
1425
1426 static int ocfs2_xa_check_space_helper(int needed_space, int free_start,
1427 int num_entries)
1428 {
1429 int free_space;
1430
1431 if (!needed_space)
1432 return 0;
1433
1434 free_space = free_start -
1435 sizeof(struct ocfs2_xattr_header) -
1436 (num_entries * sizeof(struct ocfs2_xattr_entry)) -
1437 OCFS2_XATTR_HEADER_GAP;
1438 if (free_space < 0)
1439 return -EIO;
1440 if (free_space < needed_space)
1441 return -ENOSPC;
1442
1443 return 0;
1444 }
1445
1446 static int ocfs2_xa_journal_access(handle_t *handle, struct ocfs2_xa_loc *loc,
1447 int type)
1448 {
1449 return loc->xl_ops->xlo_journal_access(handle, loc, type);
1450 }
1451
1452 static void ocfs2_xa_journal_dirty(handle_t *handle, struct ocfs2_xa_loc *loc)
1453 {
1454 loc->xl_ops->xlo_journal_dirty(handle, loc);
1455 }
1456
1457 /* Give a pointer into the storage for the given offset */
1458 static void *ocfs2_xa_offset_pointer(struct ocfs2_xa_loc *loc, int offset)
1459 {
1460 BUG_ON(offset >= loc->xl_size);
1461 return loc->xl_ops->xlo_offset_pointer(loc, offset);
1462 }
1463
1464 /*
1465 * Wipe the name+value pair and allow the storage to reclaim it. This
1466 * must be followed by either removal of the entry or a call to
1467 * ocfs2_xa_add_namevalue().
1468 */
1469 static void ocfs2_xa_wipe_namevalue(struct ocfs2_xa_loc *loc)
1470 {
1471 loc->xl_ops->xlo_wipe_namevalue(loc);
1472 }
1473
1474 /*
1475 * Find lowest offset to a name+value pair. This is the start of our
1476 * downward-growing free space.
1477 */
1478 static int ocfs2_xa_get_free_start(struct ocfs2_xa_loc *loc)
1479 {
1480 return loc->xl_ops->xlo_get_free_start(loc);
1481 }
1482
1483 /* Can we reuse loc->xl_entry for xi? */
1484 static int ocfs2_xa_can_reuse_entry(struct ocfs2_xa_loc *loc,
1485 struct ocfs2_xattr_info *xi)
1486 {
1487 return loc->xl_ops->xlo_can_reuse(loc, xi);
1488 }
1489
1490 /* How much free space is needed to set the new value */
1491 static int ocfs2_xa_check_space(struct ocfs2_xa_loc *loc,
1492 struct ocfs2_xattr_info *xi)
1493 {
1494 return loc->xl_ops->xlo_check_space(loc, xi);
1495 }
1496
1497 static void ocfs2_xa_add_entry(struct ocfs2_xa_loc *loc, u32 name_hash)
1498 {
1499 loc->xl_ops->xlo_add_entry(loc, name_hash);
1500 loc->xl_entry->xe_name_hash = cpu_to_le32(name_hash);
1501 /*
1502 * We can't leave the new entry's xe_name_offset at zero or
1503 * add_namevalue() will go nuts. We set it to the size of our
1504 * storage so that it can never be less than any other entry.
1505 */
1506 loc->xl_entry->xe_name_offset = cpu_to_le16(loc->xl_size);
1507 }
1508
1509 static void ocfs2_xa_add_namevalue(struct ocfs2_xa_loc *loc,
1510 struct ocfs2_xattr_info *xi)
1511 {
1512 int size = namevalue_size_xi(xi);
1513 int nameval_offset;
1514 char *nameval_buf;
1515
1516 loc->xl_ops->xlo_add_namevalue(loc, size);
1517 loc->xl_entry->xe_value_size = cpu_to_le64(xi->xi_value_len);
1518 loc->xl_entry->xe_name_len = xi->xi_name_len;
1519 ocfs2_xattr_set_type(loc->xl_entry, xi->xi_name_index);
1520 ocfs2_xattr_set_local(loc->xl_entry,
1521 xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE);
1522
1523 nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1524 nameval_buf = ocfs2_xa_offset_pointer(loc, nameval_offset);
1525 memset(nameval_buf, 0, size);
1526 memcpy(nameval_buf, xi->xi_name, xi->xi_name_len);
1527 }
1528
1529 static void ocfs2_xa_fill_value_buf(struct ocfs2_xa_loc *loc,
1530 struct ocfs2_xattr_value_buf *vb)
1531 {
1532 int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1533 int name_size = OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len);
1534
1535 /* Value bufs are for value trees */
1536 BUG_ON(ocfs2_xattr_is_local(loc->xl_entry));
1537 BUG_ON(namevalue_size_xe(loc->xl_entry) !=
1538 (name_size + OCFS2_XATTR_ROOT_SIZE));
1539
1540 loc->xl_ops->xlo_fill_value_buf(loc, vb);
1541 vb->vb_xv =
1542 (struct ocfs2_xattr_value_root *)ocfs2_xa_offset_pointer(loc,
1543 nameval_offset +
1544 name_size);
1545 }
1546
1547 static int ocfs2_xa_block_journal_access(handle_t *handle,
1548 struct ocfs2_xa_loc *loc, int type)
1549 {
1550 struct buffer_head *bh = loc->xl_storage;
1551 ocfs2_journal_access_func access;
1552
1553 if (loc->xl_size == (bh->b_size -
1554 offsetof(struct ocfs2_xattr_block,
1555 xb_attrs.xb_header)))
1556 access = ocfs2_journal_access_xb;
1557 else
1558 access = ocfs2_journal_access_di;
1559 return access(handle, INODE_CACHE(loc->xl_inode), bh, type);
1560 }
1561
1562 static void ocfs2_xa_block_journal_dirty(handle_t *handle,
1563 struct ocfs2_xa_loc *loc)
1564 {
1565 struct buffer_head *bh = loc->xl_storage;
1566
1567 ocfs2_journal_dirty(handle, bh);
1568 }
1569
1570 static void *ocfs2_xa_block_offset_pointer(struct ocfs2_xa_loc *loc,
1571 int offset)
1572 {
1573 return (char *)loc->xl_header + offset;
1574 }
1575
1576 static int ocfs2_xa_block_can_reuse(struct ocfs2_xa_loc *loc,
1577 struct ocfs2_xattr_info *xi)
1578 {
1579 /*
1580 * Block storage is strict. If the sizes aren't exact, we will
1581 * remove the old one and reinsert the new.
1582 */
1583 return namevalue_size_xe(loc->xl_entry) ==
1584 namevalue_size_xi(xi);
1585 }
1586
1587 static int ocfs2_xa_block_get_free_start(struct ocfs2_xa_loc *loc)
1588 {
1589 struct ocfs2_xattr_header *xh = loc->xl_header;
1590 int i, count = le16_to_cpu(xh->xh_count);
1591 int offset, free_start = loc->xl_size;
1592
1593 for (i = 0; i < count; i++) {
1594 offset = le16_to_cpu(xh->xh_entries[i].xe_name_offset);
1595 if (offset < free_start)
1596 free_start = offset;
1597 }
1598
1599 return free_start;
1600 }
1601
1602 static int ocfs2_xa_block_check_space(struct ocfs2_xa_loc *loc,
1603 struct ocfs2_xattr_info *xi)
1604 {
1605 int count = le16_to_cpu(loc->xl_header->xh_count);
1606 int free_start = ocfs2_xa_get_free_start(loc);
1607 int needed_space = ocfs2_xi_entry_usage(xi);
1608
1609 /*
1610 * Block storage will reclaim the original entry before inserting
1611 * the new value, so we only need the difference. If the new
1612 * entry is smaller than the old one, we don't need anything.
1613 */
1614 if (loc->xl_entry) {
1615 /* Don't need space if we're reusing! */
1616 if (ocfs2_xa_can_reuse_entry(loc, xi))
1617 needed_space = 0;
1618 else
1619 needed_space -= ocfs2_xe_entry_usage(loc->xl_entry);
1620 }
1621 if (needed_space < 0)
1622 needed_space = 0;
1623 return ocfs2_xa_check_space_helper(needed_space, free_start, count);
1624 }
1625
1626 /*
1627 * Block storage for xattrs keeps the name+value pairs compacted. When
1628 * we remove one, we have to shift any that preceded it towards the end.
1629 */
1630 static void ocfs2_xa_block_wipe_namevalue(struct ocfs2_xa_loc *loc)
1631 {
1632 int i, offset;
1633 int namevalue_offset, first_namevalue_offset, namevalue_size;
1634 struct ocfs2_xattr_entry *entry = loc->xl_entry;
1635 struct ocfs2_xattr_header *xh = loc->xl_header;
1636 int count = le16_to_cpu(xh->xh_count);
1637
1638 namevalue_offset = le16_to_cpu(entry->xe_name_offset);
1639 namevalue_size = namevalue_size_xe(entry);
1640 first_namevalue_offset = ocfs2_xa_get_free_start(loc);
1641
1642 /* Shift the name+value pairs */
1643 memmove((char *)xh + first_namevalue_offset + namevalue_size,
1644 (char *)xh + first_namevalue_offset,
1645 namevalue_offset - first_namevalue_offset);
1646 memset((char *)xh + first_namevalue_offset, 0, namevalue_size);
1647
1648 /* Now tell xh->xh_entries about it */
1649 for (i = 0; i < count; i++) {
1650 offset = le16_to_cpu(xh->xh_entries[i].xe_name_offset);
1651 if (offset <= namevalue_offset)
1652 le16_add_cpu(&xh->xh_entries[i].xe_name_offset,
1653 namevalue_size);
1654 }
1655
1656 /*
1657 * Note that we don't update xh_free_start or xh_name_value_len
1658 * because they're not used in block-stored xattrs.
1659 */
1660 }
1661
1662 static void ocfs2_xa_block_add_entry(struct ocfs2_xa_loc *loc, u32 name_hash)
1663 {
1664 int count = le16_to_cpu(loc->xl_header->xh_count);
1665 loc->xl_entry = &(loc->xl_header->xh_entries[count]);
1666 le16_add_cpu(&loc->xl_header->xh_count, 1);
1667 memset(loc->xl_entry, 0, sizeof(struct ocfs2_xattr_entry));
1668 }
1669
1670 static void ocfs2_xa_block_add_namevalue(struct ocfs2_xa_loc *loc, int size)
1671 {
1672 int free_start = ocfs2_xa_get_free_start(loc);
1673
1674 loc->xl_entry->xe_name_offset = cpu_to_le16(free_start - size);
1675 }
1676
1677 static void ocfs2_xa_block_fill_value_buf(struct ocfs2_xa_loc *loc,
1678 struct ocfs2_xattr_value_buf *vb)
1679 {
1680 struct buffer_head *bh = loc->xl_storage;
1681
1682 if (loc->xl_size == (bh->b_size -
1683 offsetof(struct ocfs2_xattr_block,
1684 xb_attrs.xb_header)))
1685 vb->vb_access = ocfs2_journal_access_xb;
1686 else
1687 vb->vb_access = ocfs2_journal_access_di;
1688 vb->vb_bh = bh;
1689 }
1690
1691 /*
1692 * Operations for xattrs stored in blocks. This includes inline inode
1693 * storage and unindexed ocfs2_xattr_blocks.
1694 */
1695 static const struct ocfs2_xa_loc_operations ocfs2_xa_block_loc_ops = {
1696 .xlo_journal_access = ocfs2_xa_block_journal_access,
1697 .xlo_journal_dirty = ocfs2_xa_block_journal_dirty,
1698 .xlo_offset_pointer = ocfs2_xa_block_offset_pointer,
1699 .xlo_check_space = ocfs2_xa_block_check_space,
1700 .xlo_can_reuse = ocfs2_xa_block_can_reuse,
1701 .xlo_get_free_start = ocfs2_xa_block_get_free_start,
1702 .xlo_wipe_namevalue = ocfs2_xa_block_wipe_namevalue,
1703 .xlo_add_entry = ocfs2_xa_block_add_entry,
1704 .xlo_add_namevalue = ocfs2_xa_block_add_namevalue,
1705 .xlo_fill_value_buf = ocfs2_xa_block_fill_value_buf,
1706 };
1707
1708 static int ocfs2_xa_bucket_journal_access(handle_t *handle,
1709 struct ocfs2_xa_loc *loc, int type)
1710 {
1711 struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1712
1713 return ocfs2_xattr_bucket_journal_access(handle, bucket, type);
1714 }
1715
1716 static void ocfs2_xa_bucket_journal_dirty(handle_t *handle,
1717 struct ocfs2_xa_loc *loc)
1718 {
1719 struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1720
1721 ocfs2_xattr_bucket_journal_dirty(handle, bucket);
1722 }
1723
1724 static void *ocfs2_xa_bucket_offset_pointer(struct ocfs2_xa_loc *loc,
1725 int offset)
1726 {
1727 struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1728 int block, block_offset;
1729
1730 /* The header is at the front of the bucket */
1731 block = offset >> loc->xl_inode->i_sb->s_blocksize_bits;
1732 block_offset = offset % loc->xl_inode->i_sb->s_blocksize;
1733
1734 return bucket_block(bucket, block) + block_offset;
1735 }
1736
1737 static int ocfs2_xa_bucket_can_reuse(struct ocfs2_xa_loc *loc,
1738 struct ocfs2_xattr_info *xi)
1739 {
1740 return namevalue_size_xe(loc->xl_entry) >=
1741 namevalue_size_xi(xi);
1742 }
1743
1744 static int ocfs2_xa_bucket_get_free_start(struct ocfs2_xa_loc *loc)
1745 {
1746 struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1747 return le16_to_cpu(bucket_xh(bucket)->xh_free_start);
1748 }
1749
1750 static int ocfs2_bucket_align_free_start(struct super_block *sb,
1751 int free_start, int size)
1752 {
1753 /*
1754 * We need to make sure that the name+value pair fits within
1755 * one block.
1756 */
1757 if (((free_start - size) >> sb->s_blocksize_bits) !=
1758 ((free_start - 1) >> sb->s_blocksize_bits))
1759 free_start -= free_start % sb->s_blocksize;
1760
1761 return free_start;
1762 }
1763
1764 static int ocfs2_xa_bucket_check_space(struct ocfs2_xa_loc *loc,
1765 struct ocfs2_xattr_info *xi)
1766 {
1767 int rc;
1768 int count = le16_to_cpu(loc->xl_header->xh_count);
1769 int free_start = ocfs2_xa_get_free_start(loc);
1770 int needed_space = ocfs2_xi_entry_usage(xi);
1771 int size = namevalue_size_xi(xi);
1772 struct super_block *sb = loc->xl_inode->i_sb;
1773
1774 /*
1775 * Bucket storage does not reclaim name+value pairs it cannot
1776 * reuse. They live as holes until the bucket fills, and then
1777 * the bucket is defragmented. However, the bucket can reclaim
1778 * the ocfs2_xattr_entry.
1779 */
1780 if (loc->xl_entry) {
1781 /* Don't need space if we're reusing! */
1782 if (ocfs2_xa_can_reuse_entry(loc, xi))
1783 needed_space = 0;
1784 else
1785 needed_space -= sizeof(struct ocfs2_xattr_entry);
1786 }
1787 BUG_ON(needed_space < 0);
1788
1789 if (free_start < size) {
1790 if (needed_space)
1791 return -ENOSPC;
1792 } else {
1793 /*
1794 * First we check if it would fit in the first place.
1795 * Below, we align the free start to a block. This may
1796 * slide us below the minimum gap. By checking unaligned
1797 * first, we avoid that error.
1798 */
1799 rc = ocfs2_xa_check_space_helper(needed_space, free_start,
1800 count);
1801 if (rc)
1802 return rc;
1803 free_start = ocfs2_bucket_align_free_start(sb, free_start,
1804 size);
1805 }
1806 return ocfs2_xa_check_space_helper(needed_space, free_start, count);
1807 }
1808
1809 static void ocfs2_xa_bucket_wipe_namevalue(struct ocfs2_xa_loc *loc)
1810 {
1811 le16_add_cpu(&loc->xl_header->xh_name_value_len,
1812 -namevalue_size_xe(loc->xl_entry));
1813 }
1814
1815 static void ocfs2_xa_bucket_add_entry(struct ocfs2_xa_loc *loc, u32 name_hash)
1816 {
1817 struct ocfs2_xattr_header *xh = loc->xl_header;
1818 int count = le16_to_cpu(xh->xh_count);
1819 int low = 0, high = count - 1, tmp;
1820 struct ocfs2_xattr_entry *tmp_xe;
1821
1822 /*
1823 * We keep buckets sorted by name_hash, so we need to find
1824 * our insert place.
1825 */
1826 while (low <= high && count) {
1827 tmp = (low + high) / 2;
1828 tmp_xe = &xh->xh_entries[tmp];
1829
1830 if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
1831 low = tmp + 1;
1832 else if (name_hash < le32_to_cpu(tmp_xe->xe_name_hash))
1833 high = tmp - 1;
1834 else {
1835 low = tmp;
1836 break;
1837 }
1838 }
1839
1840 if (low != count)
1841 memmove(&xh->xh_entries[low + 1],
1842 &xh->xh_entries[low],
1843 ((count - low) * sizeof(struct ocfs2_xattr_entry)));
1844
1845 le16_add_cpu(&xh->xh_count, 1);
1846 loc->xl_entry = &xh->xh_entries[low];
1847 memset(loc->xl_entry, 0, sizeof(struct ocfs2_xattr_entry));
1848 }
1849
1850 static void ocfs2_xa_bucket_add_namevalue(struct ocfs2_xa_loc *loc, int size)
1851 {
1852 int free_start = ocfs2_xa_get_free_start(loc);
1853 struct ocfs2_xattr_header *xh = loc->xl_header;
1854 struct super_block *sb = loc->xl_inode->i_sb;
1855 int nameval_offset;
1856
1857 free_start = ocfs2_bucket_align_free_start(sb, free_start, size);
1858 nameval_offset = free_start - size;
1859 loc->xl_entry->xe_name_offset = cpu_to_le16(nameval_offset);
1860 xh->xh_free_start = cpu_to_le16(nameval_offset);
1861 le16_add_cpu(&xh->xh_name_value_len, size);
1862
1863 }
1864
1865 static void ocfs2_xa_bucket_fill_value_buf(struct ocfs2_xa_loc *loc,
1866 struct ocfs2_xattr_value_buf *vb)
1867 {
1868 struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1869 struct super_block *sb = loc->xl_inode->i_sb;
1870 int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1871 int size = namevalue_size_xe(loc->xl_entry);
1872 int block_offset = nameval_offset >> sb->s_blocksize_bits;
1873
1874 /* Values are not allowed to straddle block boundaries */
1875 BUG_ON(block_offset !=
1876 ((nameval_offset + size - 1) >> sb->s_blocksize_bits));
1877 /* We expect the bucket to be filled in */
1878 BUG_ON(!bucket->bu_bhs[block_offset]);
1879
1880 vb->vb_access = ocfs2_journal_access;
1881 vb->vb_bh = bucket->bu_bhs[block_offset];
1882 }
1883
1884 /* Operations for xattrs stored in buckets. */
1885 static const struct ocfs2_xa_loc_operations ocfs2_xa_bucket_loc_ops = {
1886 .xlo_journal_access = ocfs2_xa_bucket_journal_access,
1887 .xlo_journal_dirty = ocfs2_xa_bucket_journal_dirty,
1888 .xlo_offset_pointer = ocfs2_xa_bucket_offset_pointer,
1889 .xlo_check_space = ocfs2_xa_bucket_check_space,
1890 .xlo_can_reuse = ocfs2_xa_bucket_can_reuse,
1891 .xlo_get_free_start = ocfs2_xa_bucket_get_free_start,
1892 .xlo_wipe_namevalue = ocfs2_xa_bucket_wipe_namevalue,
1893 .xlo_add_entry = ocfs2_xa_bucket_add_entry,
1894 .xlo_add_namevalue = ocfs2_xa_bucket_add_namevalue,
1895 .xlo_fill_value_buf = ocfs2_xa_bucket_fill_value_buf,
1896 };
1897
1898 static unsigned int ocfs2_xa_value_clusters(struct ocfs2_xa_loc *loc)
1899 {
1900 struct ocfs2_xattr_value_buf vb;
1901
1902 if (ocfs2_xattr_is_local(loc->xl_entry))
1903 return 0;
1904
1905 ocfs2_xa_fill_value_buf(loc, &vb);
1906 return le32_to_cpu(vb.vb_xv->xr_clusters);
1907 }
1908
1909 static int ocfs2_xa_value_truncate(struct ocfs2_xa_loc *loc, u64 bytes,
1910 struct ocfs2_xattr_set_ctxt *ctxt)
1911 {
1912 int trunc_rc, access_rc;
1913 struct ocfs2_xattr_value_buf vb;
1914
1915 ocfs2_xa_fill_value_buf(loc, &vb);
1916 trunc_rc = ocfs2_xattr_value_truncate(loc->xl_inode, &vb, bytes,
1917 ctxt);
1918
1919 /*
1920 * The caller of ocfs2_xa_value_truncate() has already called
1921 * ocfs2_xa_journal_access on the loc. However, The truncate code
1922 * calls ocfs2_extend_trans(). This may commit the previous
1923 * transaction and open a new one. If this is a bucket, truncate
1924 * could leave only vb->vb_bh set up for journaling. Meanwhile,
1925 * the caller is expecting to dirty the entire bucket. So we must
1926 * reset the journal work. We do this even if truncate has failed,
1927 * as it could have failed after committing the extend.
1928 */
1929 access_rc = ocfs2_xa_journal_access(ctxt->handle, loc,
1930 OCFS2_JOURNAL_ACCESS_WRITE);
1931
1932 /* Errors in truncate take precedence */
1933 return trunc_rc ? trunc_rc : access_rc;
1934 }
1935
1936 static void ocfs2_xa_remove_entry(struct ocfs2_xa_loc *loc)
1937 {
1938 int index, count;
1939 struct ocfs2_xattr_header *xh = loc->xl_header;
1940 struct ocfs2_xattr_entry *entry = loc->xl_entry;
1941
1942 ocfs2_xa_wipe_namevalue(loc);
1943 loc->xl_entry = NULL;
1944
1945 le16_add_cpu(&xh->xh_count, -1);
1946 count = le16_to_cpu(xh->xh_count);
1947
1948 /*
1949 * Only zero out the entry if there are more remaining. This is
1950 * important for an empty bucket, as it keeps track of the
1951 * bucket's hash value. It doesn't hurt empty block storage.
1952 */
1953 if (count) {
1954 index = ((char *)entry - (char *)&xh->xh_entries) /
1955 sizeof(struct ocfs2_xattr_entry);
1956 memmove(&xh->xh_entries[index], &xh->xh_entries[index + 1],
1957 (count - index) * sizeof(struct ocfs2_xattr_entry));
1958 memset(&xh->xh_entries[count], 0,
1959 sizeof(struct ocfs2_xattr_entry));
1960 }
1961 }
1962
1963 /*
1964 * If we have a problem adjusting the size of an external value during
1965 * ocfs2_xa_prepare_entry() or ocfs2_xa_remove(), we may have an xattr
1966 * in an intermediate state. For example, the value may be partially
1967 * truncated.
1968 *
1969 * If the value tree hasn't changed, the extend/truncate went nowhere.
1970 * We have nothing to do. The caller can treat it as a straight error.
1971 *
1972 * If the value tree got partially truncated, we now have a corrupted
1973 * extended attribute. We're going to wipe its entry and leak the
1974 * clusters. Better to leak some storage than leave a corrupt entry.
1975 *
1976 * If the value tree grew, it obviously didn't grow enough for the
1977 * new entry. We're not going to try and reclaim those clusters either.
1978 * If there was already an external value there (orig_clusters != 0),
1979 * the new clusters are attached safely and we can just leave the old
1980 * value in place. If there was no external value there, we remove
1981 * the entry.
1982 *
1983 * This way, the xattr block we store in the journal will be consistent.
1984 * If the size change broke because of the journal, no changes will hit
1985 * disk anyway.
1986 */
1987 static void ocfs2_xa_cleanup_value_truncate(struct ocfs2_xa_loc *loc,
1988 const char *what,
1989 unsigned int orig_clusters)
1990 {
1991 unsigned int new_clusters = ocfs2_xa_value_clusters(loc);
1992 char *nameval_buf = ocfs2_xa_offset_pointer(loc,
1993 le16_to_cpu(loc->xl_entry->xe_name_offset));
1994
1995 if (new_clusters < orig_clusters) {
1996 mlog(ML_ERROR,
1997 "Partial truncate while %s xattr %.*s. Leaking "
1998 "%u clusters and removing the entry\n",
1999 what, loc->xl_entry->xe_name_len, nameval_buf,
2000 orig_clusters - new_clusters);
2001 ocfs2_xa_remove_entry(loc);
2002 } else if (!orig_clusters) {
2003 mlog(ML_ERROR,
2004 "Unable to allocate an external value for xattr "
2005 "%.*s safely. Leaking %u clusters and removing the "
2006 "entry\n",
2007 loc->xl_entry->xe_name_len, nameval_buf,
2008 new_clusters - orig_clusters);
2009 ocfs2_xa_remove_entry(loc);
2010 } else if (new_clusters > orig_clusters)
2011 mlog(ML_ERROR,
2012 "Unable to grow xattr %.*s safely. %u new clusters "
2013 "have been added, but the value will not be "
2014 "modified\n",
2015 loc->xl_entry->xe_name_len, nameval_buf,
2016 new_clusters - orig_clusters);
2017 }
2018
2019 static int ocfs2_xa_remove(struct ocfs2_xa_loc *loc,
2020 struct ocfs2_xattr_set_ctxt *ctxt)
2021 {
2022 int rc = 0;
2023 unsigned int orig_clusters;
2024
2025 if (!ocfs2_xattr_is_local(loc->xl_entry)) {
2026 orig_clusters = ocfs2_xa_value_clusters(loc);
2027 rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2028 if (rc) {
2029 mlog_errno(rc);
2030 /*
2031 * Since this is remove, we can return 0 if
2032 * ocfs2_xa_cleanup_value_truncate() is going to
2033 * wipe the entry anyway. So we check the
2034 * cluster count as well.
2035 */
2036 if (orig_clusters != ocfs2_xa_value_clusters(loc))
2037 rc = 0;
2038 ocfs2_xa_cleanup_value_truncate(loc, "removing",
2039 orig_clusters);
2040 if (rc)
2041 goto out;
2042 }
2043 }
2044
2045 ocfs2_xa_remove_entry(loc);
2046
2047 out:
2048 return rc;
2049 }
2050
2051 static void ocfs2_xa_install_value_root(struct ocfs2_xa_loc *loc)
2052 {
2053 int name_size = OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len);
2054 char *nameval_buf;
2055
2056 nameval_buf = ocfs2_xa_offset_pointer(loc,
2057 le16_to_cpu(loc->xl_entry->xe_name_offset));
2058 memcpy(nameval_buf + name_size, &def_xv, OCFS2_XATTR_ROOT_SIZE);
2059 }
2060
2061 /*
2062 * Take an existing entry and make it ready for the new value. This
2063 * won't allocate space, but it may free space. It should be ready for
2064 * ocfs2_xa_prepare_entry() to finish the work.
2065 */
2066 static int ocfs2_xa_reuse_entry(struct ocfs2_xa_loc *loc,
2067 struct ocfs2_xattr_info *xi,
2068 struct ocfs2_xattr_set_ctxt *ctxt)
2069 {
2070 int rc = 0;
2071 int name_size = OCFS2_XATTR_SIZE(xi->xi_name_len);
2072 unsigned int orig_clusters;
2073 char *nameval_buf;
2074 int xe_local = ocfs2_xattr_is_local(loc->xl_entry);
2075 int xi_local = xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE;
2076
2077 BUG_ON(OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len) !=
2078 name_size);
2079
2080 nameval_buf = ocfs2_xa_offset_pointer(loc,
2081 le16_to_cpu(loc->xl_entry->xe_name_offset));
2082 if (xe_local) {
2083 memset(nameval_buf + name_size, 0,
2084 namevalue_size_xe(loc->xl_entry) - name_size);
2085 if (!xi_local)
2086 ocfs2_xa_install_value_root(loc);
2087 } else {
2088 orig_clusters = ocfs2_xa_value_clusters(loc);
2089 if (xi_local) {
2090 rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2091 if (rc < 0)
2092 mlog_errno(rc);
2093 else
2094 memset(nameval_buf + name_size, 0,
2095 namevalue_size_xe(loc->xl_entry) -
2096 name_size);
2097 } else if (le64_to_cpu(loc->xl_entry->xe_value_size) >
2098 xi->xi_value_len) {
2099 rc = ocfs2_xa_value_truncate(loc, xi->xi_value_len,
2100 ctxt);
2101 if (rc < 0)
2102 mlog_errno(rc);
2103 }
2104
2105 if (rc) {
2106 ocfs2_xa_cleanup_value_truncate(loc, "reusing",
2107 orig_clusters);
2108 goto out;
2109 }
2110 }
2111
2112 loc->xl_entry->xe_value_size = cpu_to_le64(xi->xi_value_len);
2113 ocfs2_xattr_set_local(loc->xl_entry, xi_local);
2114
2115 out:
2116 return rc;
2117 }
2118
2119 /*
2120 * Prepares loc->xl_entry to receive the new xattr. This includes
2121 * properly setting up the name+value pair region. If loc->xl_entry
2122 * already exists, it will take care of modifying it appropriately.
2123 *
2124 * Note that this modifies the data. You did journal_access already,
2125 * right?
2126 */
2127 static int ocfs2_xa_prepare_entry(struct ocfs2_xa_loc *loc,
2128 struct ocfs2_xattr_info *xi,
2129 u32 name_hash,
2130 struct ocfs2_xattr_set_ctxt *ctxt)
2131 {
2132 int rc = 0;
2133 unsigned int orig_clusters;
2134 __le64 orig_value_size = 0;
2135
2136 rc = ocfs2_xa_check_space(loc, xi);
2137 if (rc)
2138 goto out;
2139
2140 if (loc->xl_entry) {
2141 if (ocfs2_xa_can_reuse_entry(loc, xi)) {
2142 orig_value_size = loc->xl_entry->xe_value_size;
2143 rc = ocfs2_xa_reuse_entry(loc, xi, ctxt);
2144 if (rc)
2145 goto out;
2146 goto alloc_value;
2147 }
2148
2149 if (!ocfs2_xattr_is_local(loc->xl_entry)) {
2150 orig_clusters = ocfs2_xa_value_clusters(loc);
2151 rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2152 if (rc) {
2153 mlog_errno(rc);
2154 ocfs2_xa_cleanup_value_truncate(loc,
2155 "overwriting",
2156 orig_clusters);
2157 goto out;
2158 }
2159 }
2160 ocfs2_xa_wipe_namevalue(loc);
2161 } else
2162 ocfs2_xa_add_entry(loc, name_hash);
2163
2164 /*
2165 * If we get here, we have a blank entry. Fill it. We grow our
2166 * name+value pair back from the end.
2167 */
2168 ocfs2_xa_add_namevalue(loc, xi);
2169 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE)
2170 ocfs2_xa_install_value_root(loc);
2171
2172 alloc_value:
2173 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
2174 orig_clusters = ocfs2_xa_value_clusters(loc);
2175 rc = ocfs2_xa_value_truncate(loc, xi->xi_value_len, ctxt);
2176 if (rc < 0) {
2177 ctxt->set_abort = 1;
2178 ocfs2_xa_cleanup_value_truncate(loc, "growing",
2179 orig_clusters);
2180 /*
2181 * If we were growing an existing value,
2182 * ocfs2_xa_cleanup_value_truncate() won't remove
2183 * the entry. We need to restore the original value
2184 * size.
2185 */
2186 if (loc->xl_entry) {
2187 BUG_ON(!orig_value_size);
2188 loc->xl_entry->xe_value_size = orig_value_size;
2189 }
2190 mlog_errno(rc);
2191 }
2192 }
2193
2194 out:
2195 return rc;
2196 }
2197
2198 /*
2199 * Store the value portion of the name+value pair. This will skip
2200 * values that are stored externally. Their tree roots were set up
2201 * by ocfs2_xa_prepare_entry().
2202 */
2203 static int ocfs2_xa_store_value(struct ocfs2_xa_loc *loc,
2204 struct ocfs2_xattr_info *xi,
2205 struct ocfs2_xattr_set_ctxt *ctxt)
2206 {
2207 int rc = 0;
2208 int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
2209 int name_size = OCFS2_XATTR_SIZE(xi->xi_name_len);
2210 char *nameval_buf;
2211 struct ocfs2_xattr_value_buf vb;
2212
2213 nameval_buf = ocfs2_xa_offset_pointer(loc, nameval_offset);
2214 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
2215 ocfs2_xa_fill_value_buf(loc, &vb);
2216 rc = __ocfs2_xattr_set_value_outside(loc->xl_inode,
2217 ctxt->handle, &vb,
2218 xi->xi_value,
2219 xi->xi_value_len);
2220 } else
2221 memcpy(nameval_buf + name_size, xi->xi_value, xi->xi_value_len);
2222
2223 return rc;
2224 }
2225
2226 static int ocfs2_xa_set(struct ocfs2_xa_loc *loc,
2227 struct ocfs2_xattr_info *xi,
2228 struct ocfs2_xattr_set_ctxt *ctxt)
2229 {
2230 int ret;
2231 u32 name_hash = ocfs2_xattr_name_hash(loc->xl_inode, xi->xi_name,
2232 xi->xi_name_len);
2233
2234 ret = ocfs2_xa_journal_access(ctxt->handle, loc,
2235 OCFS2_JOURNAL_ACCESS_WRITE);
2236 if (ret) {
2237 mlog_errno(ret);
2238 goto out;
2239 }
2240
2241 /*
2242 * From here on out, everything is going to modify the buffer a
2243 * little. Errors are going to leave the xattr header in a
2244 * sane state. Thus, even with errors we dirty the sucker.
2245 */
2246
2247 /* Don't worry, we are never called with !xi_value and !xl_entry */
2248 if (!xi->xi_value) {
2249 ret = ocfs2_xa_remove(loc, ctxt);
2250 goto out_dirty;
2251 }
2252
2253 ret = ocfs2_xa_prepare_entry(loc, xi, name_hash, ctxt);
2254 if (ret) {
2255 if (ret != -ENOSPC)
2256 mlog_errno(ret);
2257 goto out_dirty;
2258 }
2259
2260 ret = ocfs2_xa_store_value(loc, xi, ctxt);
2261 if (ret)
2262 mlog_errno(ret);
2263
2264 out_dirty:
2265 ocfs2_xa_journal_dirty(ctxt->handle, loc);
2266
2267 out:
2268 return ret;
2269 }
2270
2271 static void ocfs2_init_dinode_xa_loc(struct ocfs2_xa_loc *loc,
2272 struct inode *inode,
2273 struct buffer_head *bh,
2274 struct ocfs2_xattr_entry *entry)
2275 {
2276 struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
2277
2278 BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_XATTR_FL));
2279
2280 loc->xl_inode = inode;
2281 loc->xl_ops = &ocfs2_xa_block_loc_ops;
2282 loc->xl_storage = bh;
2283 loc->xl_entry = entry;
2284 loc->xl_size = le16_to_cpu(di->i_xattr_inline_size);
2285 loc->xl_header =
2286 (struct ocfs2_xattr_header *)(bh->b_data + bh->b_size -
2287 loc->xl_size);
2288 }
2289
2290 static void ocfs2_init_xattr_block_xa_loc(struct ocfs2_xa_loc *loc,
2291 struct inode *inode,
2292 struct buffer_head *bh,
2293 struct ocfs2_xattr_entry *entry)
2294 {
2295 struct ocfs2_xattr_block *xb =
2296 (struct ocfs2_xattr_block *)bh->b_data;
2297
2298 BUG_ON(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED);
2299
2300 loc->xl_inode = inode;
2301 loc->xl_ops = &ocfs2_xa_block_loc_ops;
2302 loc->xl_storage = bh;
2303 loc->xl_header = &(xb->xb_attrs.xb_header);
2304 loc->xl_entry = entry;
2305 loc->xl_size = bh->b_size - offsetof(struct ocfs2_xattr_block,
2306 xb_attrs.xb_header);
2307 }
2308
2309 static void ocfs2_init_xattr_bucket_xa_loc(struct ocfs2_xa_loc *loc,
2310 struct ocfs2_xattr_bucket *bucket,
2311 struct ocfs2_xattr_entry *entry)
2312 {
2313 loc->xl_inode = bucket->bu_inode;
2314 loc->xl_ops = &ocfs2_xa_bucket_loc_ops;
2315 loc->xl_storage = bucket;
2316 loc->xl_header = bucket_xh(bucket);
2317 loc->xl_entry = entry;
2318 loc->xl_size = OCFS2_XATTR_BUCKET_SIZE;
2319 }
2320
2321 /*
2322 * In xattr remove, if it is stored outside and refcounted, we may have
2323 * the chance to split the refcount tree. So need the allocators.
2324 */
2325 static int ocfs2_lock_xattr_remove_allocators(struct inode *inode,
2326 struct ocfs2_xattr_value_root *xv,
2327 struct ocfs2_caching_info *ref_ci,
2328 struct buffer_head *ref_root_bh,
2329 struct ocfs2_alloc_context **meta_ac,
2330 int *ref_credits)
2331 {
2332 int ret, meta_add = 0;
2333 u32 p_cluster, num_clusters;
2334 unsigned int ext_flags;
2335
2336 *ref_credits = 0;
2337 ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
2338 &num_clusters,
2339 &xv->xr_list,
2340 &ext_flags);
2341 if (ret) {
2342 mlog_errno(ret);
2343 goto out;
2344 }
2345
2346 if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
2347 goto out;
2348
2349 ret = ocfs2_refcounted_xattr_delete_need(inode, ref_ci,
2350 ref_root_bh, xv,
2351 &meta_add, ref_credits);
2352 if (ret) {
2353 mlog_errno(ret);
2354 goto out;
2355 }
2356
2357 ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb),
2358 meta_add, meta_ac);
2359 if (ret)
2360 mlog_errno(ret);
2361
2362 out:
2363 return ret;
2364 }
2365
2366 static int ocfs2_remove_value_outside(struct inode*inode,
2367 struct ocfs2_xattr_value_buf *vb,
2368 struct ocfs2_xattr_header *header,
2369 struct ocfs2_caching_info *ref_ci,
2370 struct buffer_head *ref_root_bh)
2371 {
2372 int ret = 0, i, ref_credits;
2373 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2374 struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
2375 void *val;
2376
2377 ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
2378
2379 for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
2380 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
2381
2382 if (ocfs2_xattr_is_local(entry))
2383 continue;
2384
2385 val = (void *)header +
2386 le16_to_cpu(entry->xe_name_offset);
2387 vb->vb_xv = (struct ocfs2_xattr_value_root *)
2388 (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
2389
2390 ret = ocfs2_lock_xattr_remove_allocators(inode, vb->vb_xv,
2391 ref_ci, ref_root_bh,
2392 &ctxt.meta_ac,
2393 &ref_credits);
2394
2395 ctxt.handle = ocfs2_start_trans(osb, ref_credits +
2396 ocfs2_remove_extent_credits(osb->sb));
2397 if (IS_ERR(ctxt.handle)) {
2398 ret = PTR_ERR(ctxt.handle);
2399 mlog_errno(ret);
2400 break;
2401 }
2402
2403 ret = ocfs2_xattr_value_truncate(inode, vb, 0, &ctxt);
2404
2405 ocfs2_commit_trans(osb, ctxt.handle);
2406 if (ctxt.meta_ac) {
2407 ocfs2_free_alloc_context(ctxt.meta_ac);
2408 ctxt.meta_ac = NULL;
2409 }
2410
2411 if (ret < 0) {
2412 mlog_errno(ret);
2413 break;
2414 }
2415
2416 }
2417
2418 if (ctxt.meta_ac)
2419 ocfs2_free_alloc_context(ctxt.meta_ac);
2420 ocfs2_schedule_truncate_log_flush(osb, 1);
2421 ocfs2_run_deallocs(osb, &ctxt.dealloc);
2422 return ret;
2423 }
2424
2425 static int ocfs2_xattr_ibody_remove(struct inode *inode,
2426 struct buffer_head *di_bh,
2427 struct ocfs2_caching_info *ref_ci,
2428 struct buffer_head *ref_root_bh)
2429 {
2430
2431 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2432 struct ocfs2_xattr_header *header;
2433 int ret;
2434 struct ocfs2_xattr_value_buf vb = {
2435 .vb_bh = di_bh,
2436 .vb_access = ocfs2_journal_access_di,
2437 };
2438
2439 header = (struct ocfs2_xattr_header *)
2440 ((void *)di + inode->i_sb->s_blocksize -
2441 le16_to_cpu(di->i_xattr_inline_size));
2442
2443 ret = ocfs2_remove_value_outside(inode, &vb, header,
2444 ref_ci, ref_root_bh);
2445
2446 return ret;
2447 }
2448
2449 struct ocfs2_rm_xattr_bucket_para {
2450 struct ocfs2_caching_info *ref_ci;
2451 struct buffer_head *ref_root_bh;
2452 };
2453
2454 static int ocfs2_xattr_block_remove(struct inode *inode,
2455 struct buffer_head *blk_bh,
2456 struct ocfs2_caching_info *ref_ci,
2457 struct buffer_head *ref_root_bh)
2458 {
2459 struct ocfs2_xattr_block *xb;
2460 int ret = 0;
2461 struct ocfs2_xattr_value_buf vb = {
2462 .vb_bh = blk_bh,
2463 .vb_access = ocfs2_journal_access_xb,
2464 };
2465 struct ocfs2_rm_xattr_bucket_para args = {
2466 .ref_ci = ref_ci,
2467 .ref_root_bh = ref_root_bh,
2468 };
2469
2470 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2471 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2472 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
2473 ret = ocfs2_remove_value_outside(inode, &vb, header,
2474 ref_ci, ref_root_bh);
2475 } else
2476 ret = ocfs2_iterate_xattr_index_block(inode,
2477 blk_bh,
2478 ocfs2_rm_xattr_cluster,
2479 &args);
2480
2481 return ret;
2482 }
2483
2484 static int ocfs2_xattr_free_block(struct inode *inode,
2485 u64 block,
2486 struct ocfs2_caching_info *ref_ci,
2487 struct buffer_head *ref_root_bh)
2488 {
2489 struct inode *xb_alloc_inode;
2490 struct buffer_head *xb_alloc_bh = NULL;
2491 struct buffer_head *blk_bh = NULL;
2492 struct ocfs2_xattr_block *xb;
2493 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2494 handle_t *handle;
2495 int ret = 0;
2496 u64 blk, bg_blkno;
2497 u16 bit;
2498
2499 ret = ocfs2_read_xattr_block(inode, block, &blk_bh);
2500 if (ret < 0) {
2501 mlog_errno(ret);
2502 goto out;
2503 }
2504
2505 ret = ocfs2_xattr_block_remove(inode, blk_bh, ref_ci, ref_root_bh);
2506 if (ret < 0) {
2507 mlog_errno(ret);
2508 goto out;
2509 }
2510
2511 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2512 blk = le64_to_cpu(xb->xb_blkno);
2513 bit = le16_to_cpu(xb->xb_suballoc_bit);
2514 if (xb->xb_suballoc_loc)
2515 bg_blkno = le64_to_cpu(xb->xb_suballoc_loc);
2516 else
2517 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
2518
2519 xb_alloc_inode = ocfs2_get_system_file_inode(osb,
2520 EXTENT_ALLOC_SYSTEM_INODE,
2521 le16_to_cpu(xb->xb_suballoc_slot));
2522 if (!xb_alloc_inode) {
2523 ret = -ENOMEM;
2524 mlog_errno(ret);
2525 goto out;
2526 }
2527 inode_lock(xb_alloc_inode);
2528
2529 ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
2530 if (ret < 0) {
2531 mlog_errno(ret);
2532 goto out_mutex;
2533 }
2534
2535 handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
2536 if (IS_ERR(handle)) {
2537 ret = PTR_ERR(handle);
2538 mlog_errno(ret);
2539 goto out_unlock;
2540 }
2541
2542 ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
2543 bit, bg_blkno, 1);
2544 if (ret < 0)
2545 mlog_errno(ret);
2546
2547 ocfs2_commit_trans(osb, handle);
2548 out_unlock:
2549 ocfs2_inode_unlock(xb_alloc_inode, 1);
2550 brelse(xb_alloc_bh);
2551 out_mutex:
2552 inode_unlock(xb_alloc_inode);
2553 iput(xb_alloc_inode);
2554 out:
2555 brelse(blk_bh);
2556 return ret;
2557 }
2558
2559 /*
2560 * ocfs2_xattr_remove()
2561 *
2562 * Free extended attribute resources associated with this inode.
2563 */
2564 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
2565 {
2566 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2567 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2568 struct ocfs2_refcount_tree *ref_tree = NULL;
2569 struct buffer_head *ref_root_bh = NULL;
2570 struct ocfs2_caching_info *ref_ci = NULL;
2571 handle_t *handle;
2572 int ret;
2573
2574 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2575 return 0;
2576
2577 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
2578 return 0;
2579
2580 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) {
2581 ret = ocfs2_lock_refcount_tree(OCFS2_SB(inode->i_sb),
2582 le64_to_cpu(di->i_refcount_loc),
2583 1, &ref_tree, &ref_root_bh);
2584 if (ret) {
2585 mlog_errno(ret);
2586 goto out;
2587 }
2588 ref_ci = &ref_tree->rf_ci;
2589
2590 }
2591
2592 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2593 ret = ocfs2_xattr_ibody_remove(inode, di_bh,
2594 ref_ci, ref_root_bh);
2595 if (ret < 0) {
2596 mlog_errno(ret);
2597 goto out;
2598 }
2599 }
2600
2601 if (di->i_xattr_loc) {
2602 ret = ocfs2_xattr_free_block(inode,
2603 le64_to_cpu(di->i_xattr_loc),
2604 ref_ci, ref_root_bh);
2605 if (ret < 0) {
2606 mlog_errno(ret);
2607 goto out;
2608 }
2609 }
2610
2611 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
2612 OCFS2_INODE_UPDATE_CREDITS);
2613 if (IS_ERR(handle)) {
2614 ret = PTR_ERR(handle);
2615 mlog_errno(ret);
2616 goto out;
2617 }
2618 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
2619 OCFS2_JOURNAL_ACCESS_WRITE);
2620 if (ret) {
2621 mlog_errno(ret);
2622 goto out_commit;
2623 }
2624
2625 di->i_xattr_loc = 0;
2626
2627 spin_lock(&oi->ip_lock);
2628 oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
2629 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
2630 spin_unlock(&oi->ip_lock);
2631 ocfs2_update_inode_fsync_trans(handle, inode, 0);
2632
2633 ocfs2_journal_dirty(handle, di_bh);
2634 out_commit:
2635 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
2636 out:
2637 if (ref_tree)
2638 ocfs2_unlock_refcount_tree(OCFS2_SB(inode->i_sb), ref_tree, 1);
2639 brelse(ref_root_bh);
2640 return ret;
2641 }
2642
2643 static int ocfs2_xattr_has_space_inline(struct inode *inode,
2644 struct ocfs2_dinode *di)
2645 {
2646 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2647 unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
2648 int free;
2649
2650 if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
2651 return 0;
2652
2653 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2654 struct ocfs2_inline_data *idata = &di->id2.i_data;
2655 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
2656 } else if (ocfs2_inode_is_fast_symlink(inode)) {
2657 free = ocfs2_fast_symlink_chars(inode->i_sb) -
2658 le64_to_cpu(di->i_size);
2659 } else {
2660 struct ocfs2_extent_list *el = &di->id2.i_list;
2661 free = (le16_to_cpu(el->l_count) -
2662 le16_to_cpu(el->l_next_free_rec)) *
2663 sizeof(struct ocfs2_extent_rec);
2664 }
2665 if (free >= xattrsize)
2666 return 1;
2667
2668 return 0;
2669 }
2670
2671 /*
2672 * ocfs2_xattr_ibody_find()
2673 *
2674 * Find extended attribute in inode block and
2675 * fill search info into struct ocfs2_xattr_search.
2676 */
2677 static int ocfs2_xattr_ibody_find(struct inode *inode,
2678 int name_index,
2679 const char *name,
2680 struct ocfs2_xattr_search *xs)
2681 {
2682 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2683 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2684 int ret;
2685 int has_space = 0;
2686
2687 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2688 return 0;
2689
2690 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2691 down_read(&oi->ip_alloc_sem);
2692 has_space = ocfs2_xattr_has_space_inline(inode, di);
2693 up_read(&oi->ip_alloc_sem);
2694 if (!has_space)
2695 return 0;
2696 }
2697
2698 xs->xattr_bh = xs->inode_bh;
2699 xs->end = (void *)di + inode->i_sb->s_blocksize;
2700 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
2701 xs->header = (struct ocfs2_xattr_header *)
2702 (xs->end - le16_to_cpu(di->i_xattr_inline_size));
2703 else
2704 xs->header = (struct ocfs2_xattr_header *)
2705 (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
2706 xs->base = (void *)xs->header;
2707 xs->here = xs->header->xh_entries;
2708
2709 /* Find the named attribute. */
2710 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2711 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2712 if (ret && ret != -ENODATA)
2713 return ret;
2714 xs->not_found = ret;
2715 }
2716
2717 return 0;
2718 }
2719
2720 static int ocfs2_xattr_ibody_init(struct inode *inode,
2721 struct buffer_head *di_bh,
2722 struct ocfs2_xattr_set_ctxt *ctxt)
2723 {
2724 int ret;
2725 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2726 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2727 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2728 unsigned int xattrsize = osb->s_xattr_inline_size;
2729
2730 if (!ocfs2_xattr_has_space_inline(inode, di)) {
2731 ret = -ENOSPC;
2732 goto out;
2733 }
2734
2735 ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode), di_bh,
2736 OCFS2_JOURNAL_ACCESS_WRITE);
2737 if (ret) {
2738 mlog_errno(ret);
2739 goto out;
2740 }
2741
2742 /*
2743 * Adjust extent record count or inline data size
2744 * to reserve space for extended attribute.
2745 */
2746 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2747 struct ocfs2_inline_data *idata = &di->id2.i_data;
2748 le16_add_cpu(&idata->id_count, -xattrsize);
2749 } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
2750 struct ocfs2_extent_list *el = &di->id2.i_list;
2751 le16_add_cpu(&el->l_count, -(xattrsize /
2752 sizeof(struct ocfs2_extent_rec)));
2753 }
2754 di->i_xattr_inline_size = cpu_to_le16(xattrsize);
2755
2756 spin_lock(&oi->ip_lock);
2757 oi->ip_dyn_features |= OCFS2_INLINE_XATTR_FL|OCFS2_HAS_XATTR_FL;
2758 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
2759 spin_unlock(&oi->ip_lock);
2760
2761 ocfs2_journal_dirty(ctxt->handle, di_bh);
2762
2763 out:
2764 return ret;
2765 }
2766
2767 /*
2768 * ocfs2_xattr_ibody_set()
2769 *
2770 * Set, replace or remove an extended attribute into inode block.
2771 *
2772 */
2773 static int ocfs2_xattr_ibody_set(struct inode *inode,
2774 struct ocfs2_xattr_info *xi,
2775 struct ocfs2_xattr_search *xs,
2776 struct ocfs2_xattr_set_ctxt *ctxt)
2777 {
2778 int ret;
2779 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2780 struct ocfs2_xa_loc loc;
2781
2782 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2783 return -ENOSPC;
2784
2785 down_write(&oi->ip_alloc_sem);
2786 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2787 ret = ocfs2_xattr_ibody_init(inode, xs->inode_bh, ctxt);
2788 if (ret) {
2789 if (ret != -ENOSPC)
2790 mlog_errno(ret);
2791 goto out;
2792 }
2793 }
2794
2795 ocfs2_init_dinode_xa_loc(&loc, inode, xs->inode_bh,
2796 xs->not_found ? NULL : xs->here);
2797 ret = ocfs2_xa_set(&loc, xi, ctxt);
2798 if (ret) {
2799 if (ret != -ENOSPC)
2800 mlog_errno(ret);
2801 goto out;
2802 }
2803 xs->here = loc.xl_entry;
2804
2805 out:
2806 up_write(&oi->ip_alloc_sem);
2807
2808 return ret;
2809 }
2810
2811 /*
2812 * ocfs2_xattr_block_find()
2813 *
2814 * Find extended attribute in external block and
2815 * fill search info into struct ocfs2_xattr_search.
2816 */
2817 static int ocfs2_xattr_block_find(struct inode *inode,
2818 int name_index,
2819 const char *name,
2820 struct ocfs2_xattr_search *xs)
2821 {
2822 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2823 struct buffer_head *blk_bh = NULL;
2824 struct ocfs2_xattr_block *xb;
2825 int ret = 0;
2826
2827 if (!di->i_xattr_loc)
2828 return ret;
2829
2830 ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
2831 &blk_bh);
2832 if (ret < 0) {
2833 mlog_errno(ret);
2834 return ret;
2835 }
2836
2837 xs->xattr_bh = blk_bh;
2838 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2839
2840 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2841 xs->header = &xb->xb_attrs.xb_header;
2842 xs->base = (void *)xs->header;
2843 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
2844 xs->here = xs->header->xh_entries;
2845
2846 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2847 } else
2848 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
2849 name_index,
2850 name, xs);
2851
2852 if (ret && ret != -ENODATA) {
2853 xs->xattr_bh = NULL;
2854 goto cleanup;
2855 }
2856 xs->not_found = ret;
2857 return 0;
2858 cleanup:
2859 brelse(blk_bh);
2860
2861 return ret;
2862 }
2863
2864 static int ocfs2_create_xattr_block(struct inode *inode,
2865 struct buffer_head *inode_bh,
2866 struct ocfs2_xattr_set_ctxt *ctxt,
2867 int indexed,
2868 struct buffer_head **ret_bh)
2869 {
2870 int ret;
2871 u16 suballoc_bit_start;
2872 u32 num_got;
2873 u64 suballoc_loc, first_blkno;
2874 struct ocfs2_dinode *di = (struct ocfs2_dinode *)inode_bh->b_data;
2875 struct buffer_head *new_bh = NULL;
2876 struct ocfs2_xattr_block *xblk;
2877
2878 ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
2879 inode_bh, OCFS2_JOURNAL_ACCESS_CREATE);
2880 if (ret < 0) {
2881 mlog_errno(ret);
2882 goto end;
2883 }
2884
2885 ret = ocfs2_claim_metadata(ctxt->handle, ctxt->meta_ac, 1,
2886 &suballoc_loc, &suballoc_bit_start,
2887 &num_got, &first_blkno);
2888 if (ret < 0) {
2889 mlog_errno(ret);
2890 goto end;
2891 }
2892
2893 new_bh = sb_getblk(inode->i_sb, first_blkno);
2894 if (!new_bh) {
2895 ret = -ENOMEM;
2896 mlog_errno(ret);
2897 goto end;
2898 }
2899
2900 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), new_bh);
2901
2902 ret = ocfs2_journal_access_xb(ctxt->handle, INODE_CACHE(inode),
2903 new_bh,
2904 OCFS2_JOURNAL_ACCESS_CREATE);
2905 if (ret < 0) {
2906 mlog_errno(ret);
2907 goto end;
2908 }
2909
2910 /* Initialize ocfs2_xattr_block */
2911 xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
2912 memset(xblk, 0, inode->i_sb->s_blocksize);
2913 strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
2914 xblk->xb_suballoc_slot = cpu_to_le16(ctxt->meta_ac->ac_alloc_slot);
2915 xblk->xb_suballoc_loc = cpu_to_le64(suballoc_loc);
2916 xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
2917 xblk->xb_fs_generation =
2918 cpu_to_le32(OCFS2_SB(inode->i_sb)->fs_generation);
2919 xblk->xb_blkno = cpu_to_le64(first_blkno);
2920 if (indexed) {
2921 struct ocfs2_xattr_tree_root *xr = &xblk->xb_attrs.xb_root;
2922 xr->xt_clusters = cpu_to_le32(1);
2923 xr->xt_last_eb_blk = 0;
2924 xr->xt_list.l_tree_depth = 0;
2925 xr->xt_list.l_count = cpu_to_le16(
2926 ocfs2_xattr_recs_per_xb(inode->i_sb));
2927 xr->xt_list.l_next_free_rec = cpu_to_le16(1);
2928 xblk->xb_flags = cpu_to_le16(OCFS2_XATTR_INDEXED);
2929 }
2930 ocfs2_journal_dirty(ctxt->handle, new_bh);
2931
2932 /* Add it to the inode */
2933 di->i_xattr_loc = cpu_to_le64(first_blkno);
2934
2935 spin_lock(&OCFS2_I(inode)->ip_lock);
2936 OCFS2_I(inode)->ip_dyn_features |= OCFS2_HAS_XATTR_FL;
2937 di->i_dyn_features = cpu_to_le16(OCFS2_I(inode)->ip_dyn_features);
2938 spin_unlock(&OCFS2_I(inode)->ip_lock);
2939
2940 ocfs2_journal_dirty(ctxt->handle, inode_bh);
2941
2942 *ret_bh = new_bh;
2943 new_bh = NULL;
2944
2945 end:
2946 brelse(new_bh);
2947 return ret;
2948 }
2949
2950 /*
2951 * ocfs2_xattr_block_set()
2952 *
2953 * Set, replace or remove an extended attribute into external block.
2954 *
2955 */
2956 static int ocfs2_xattr_block_set(struct inode *inode,
2957 struct ocfs2_xattr_info *xi,
2958 struct ocfs2_xattr_search *xs,
2959 struct ocfs2_xattr_set_ctxt *ctxt)
2960 {
2961 struct buffer_head *new_bh = NULL;
2962 struct ocfs2_xattr_block *xblk = NULL;
2963 int ret;
2964 struct ocfs2_xa_loc loc;
2965
2966 if (!xs->xattr_bh) {
2967 ret = ocfs2_create_xattr_block(inode, xs->inode_bh, ctxt,
2968 0, &new_bh);
2969 if (ret) {
2970 mlog_errno(ret);
2971 goto end;
2972 }
2973
2974 xs->xattr_bh = new_bh;
2975 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2976 xs->header = &xblk->xb_attrs.xb_header;
2977 xs->base = (void *)xs->header;
2978 xs->end = (void *)xblk + inode->i_sb->s_blocksize;
2979 xs->here = xs->header->xh_entries;
2980 } else
2981 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2982
2983 if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
2984 ocfs2_init_xattr_block_xa_loc(&loc, inode, xs->xattr_bh,
2985 xs->not_found ? NULL : xs->here);
2986
2987 ret = ocfs2_xa_set(&loc, xi, ctxt);
2988 if (!ret)
2989 xs->here = loc.xl_entry;
2990 else if ((ret != -ENOSPC) || ctxt->set_abort)
2991 goto end;
2992 else {
2993 ret = ocfs2_xattr_create_index_block(inode, xs, ctxt);
2994 if (ret)
2995 goto end;
2996 }
2997 }
2998
2999 if (le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)
3000 ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs, ctxt);
3001
3002 end:
3003 return ret;
3004 }
3005
3006 /* Check whether the new xattr can be inserted into the inode. */
3007 static int ocfs2_xattr_can_be_in_inode(struct inode *inode,
3008 struct ocfs2_xattr_info *xi,
3009 struct ocfs2_xattr_search *xs)
3010 {
3011 struct ocfs2_xattr_entry *last;
3012 int free, i;
3013 size_t min_offs = xs->end - xs->base;
3014
3015 if (!xs->header)
3016 return 0;
3017
3018 last = xs->header->xh_entries;
3019
3020 for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
3021 size_t offs = le16_to_cpu(last->xe_name_offset);
3022 if (offs < min_offs)
3023 min_offs = offs;
3024 last += 1;
3025 }
3026
3027 free = min_offs - ((void *)last - xs->base) - OCFS2_XATTR_HEADER_GAP;
3028 if (free < 0)
3029 return 0;
3030
3031 BUG_ON(!xs->not_found);
3032
3033 if (free >= (sizeof(struct ocfs2_xattr_entry) + namevalue_size_xi(xi)))
3034 return 1;
3035
3036 return 0;
3037 }
3038
3039 static int ocfs2_calc_xattr_set_need(struct inode *inode,
3040 struct ocfs2_dinode *di,
3041 struct ocfs2_xattr_info *xi,
3042 struct ocfs2_xattr_search *xis,
3043 struct ocfs2_xattr_search *xbs,
3044 int *clusters_need,
3045 int *meta_need,
3046 int *credits_need)
3047 {
3048 int ret = 0, old_in_xb = 0;
3049 int clusters_add = 0, meta_add = 0, credits = 0;
3050 struct buffer_head *bh = NULL;
3051 struct ocfs2_xattr_block *xb = NULL;
3052 struct ocfs2_xattr_entry *xe = NULL;
3053 struct ocfs2_xattr_value_root *xv = NULL;
3054 char *base = NULL;
3055 int name_offset, name_len = 0;
3056 u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
3057 xi->xi_value_len);
3058 u64 value_size;
3059
3060 /*
3061 * Calculate the clusters we need to write.
3062 * No matter whether we replace an old one or add a new one,
3063 * we need this for writing.
3064 */
3065 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE)
3066 credits += new_clusters *
3067 ocfs2_clusters_to_blocks(inode->i_sb, 1);
3068
3069 if (xis->not_found && xbs->not_found) {
3070 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3071
3072 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3073 clusters_add += new_clusters;
3074 credits += ocfs2_calc_extend_credits(inode->i_sb,
3075 &def_xv.xv.xr_list);
3076 }
3077
3078 goto meta_guess;
3079 }
3080
3081 if (!xis->not_found) {
3082 xe = xis->here;
3083 name_offset = le16_to_cpu(xe->xe_name_offset);
3084 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3085 base = xis->base;
3086 credits += OCFS2_INODE_UPDATE_CREDITS;
3087 } else {
3088 int i, block_off = 0;
3089 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
3090 xe = xbs->here;
3091 name_offset = le16_to_cpu(xe->xe_name_offset);
3092 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3093 i = xbs->here - xbs->header->xh_entries;
3094 old_in_xb = 1;
3095
3096 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
3097 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3098 bucket_xh(xbs->bucket),
3099 i, &block_off,
3100 &name_offset);
3101 base = bucket_block(xbs->bucket, block_off);
3102 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3103 } else {
3104 base = xbs->base;
3105 credits += OCFS2_XATTR_BLOCK_UPDATE_CREDITS;
3106 }
3107 }
3108
3109 /*
3110 * delete a xattr doesn't need metadata and cluster allocation.
3111 * so just calculate the credits and return.
3112 *
3113 * The credits for removing the value tree will be extended
3114 * by ocfs2_remove_extent itself.
3115 */
3116 if (!xi->xi_value) {
3117 if (!ocfs2_xattr_is_local(xe))
3118 credits += ocfs2_remove_extent_credits(inode->i_sb);
3119
3120 goto out;
3121 }
3122
3123 /* do cluster allocation guess first. */
3124 value_size = le64_to_cpu(xe->xe_value_size);
3125
3126 if (old_in_xb) {
3127 /*
3128 * In xattr set, we always try to set the xe in inode first,
3129 * so if it can be inserted into inode successfully, the old
3130 * one will be removed from the xattr block, and this xattr
3131 * will be inserted into inode as a new xattr in inode.
3132 */
3133 if (ocfs2_xattr_can_be_in_inode(inode, xi, xis)) {
3134 clusters_add += new_clusters;
3135 credits += ocfs2_remove_extent_credits(inode->i_sb) +
3136 OCFS2_INODE_UPDATE_CREDITS;
3137 if (!ocfs2_xattr_is_local(xe))
3138 credits += ocfs2_calc_extend_credits(
3139 inode->i_sb,
3140 &def_xv.xv.xr_list);
3141 goto out;
3142 }
3143 }
3144
3145 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3146 /* the new values will be stored outside. */
3147 u32 old_clusters = 0;
3148
3149 if (!ocfs2_xattr_is_local(xe)) {
3150 old_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
3151 value_size);
3152 xv = (struct ocfs2_xattr_value_root *)
3153 (base + name_offset + name_len);
3154 value_size = OCFS2_XATTR_ROOT_SIZE;
3155 } else
3156 xv = &def_xv.xv;
3157
3158 if (old_clusters >= new_clusters) {
3159 credits += ocfs2_remove_extent_credits(inode->i_sb);
3160 goto out;
3161 } else {
3162 meta_add += ocfs2_extend_meta_needed(&xv->xr_list);
3163 clusters_add += new_clusters - old_clusters;
3164 credits += ocfs2_calc_extend_credits(inode->i_sb,
3165 &xv->xr_list);
3166 if (value_size >= OCFS2_XATTR_ROOT_SIZE)
3167 goto out;
3168 }
3169 } else {
3170 /*
3171 * Now the new value will be stored inside. So if the new
3172 * value is smaller than the size of value root or the old
3173 * value, we don't need any allocation, otherwise we have
3174 * to guess metadata allocation.
3175 */
3176 if ((ocfs2_xattr_is_local(xe) &&
3177 (value_size >= xi->xi_value_len)) ||
3178 (!ocfs2_xattr_is_local(xe) &&
3179 OCFS2_XATTR_ROOT_SIZE >= xi->xi_value_len))
3180 goto out;
3181 }
3182
3183 meta_guess:
3184 /* calculate metadata allocation. */
3185 if (di->i_xattr_loc) {
3186 if (!xbs->xattr_bh) {
3187 ret = ocfs2_read_xattr_block(inode,
3188 le64_to_cpu(di->i_xattr_loc),
3189 &bh);
3190 if (ret) {
3191 mlog_errno(ret);
3192 goto out;
3193 }
3194
3195 xb = (struct ocfs2_xattr_block *)bh->b_data;
3196 } else
3197 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
3198
3199 /*
3200 * If there is already an xattr tree, good, we can calculate
3201 * like other b-trees. Otherwise we may have the chance of
3202 * create a tree, the credit calculation is borrowed from
3203 * ocfs2_calc_extend_credits with root_el = NULL. And the
3204 * new tree will be cluster based, so no meta is needed.
3205 */
3206 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
3207 struct ocfs2_extent_list *el =
3208 &xb->xb_attrs.xb_root.xt_list;
3209 meta_add += ocfs2_extend_meta_needed(el);
3210 credits += ocfs2_calc_extend_credits(inode->i_sb,
3211 el);
3212 } else
3213 credits += OCFS2_SUBALLOC_ALLOC + 1;
3214
3215 /*
3216 * This cluster will be used either for new bucket or for
3217 * new xattr block.
3218 * If the cluster size is the same as the bucket size, one
3219 * more is needed since we may need to extend the bucket
3220 * also.
3221 */
3222 clusters_add += 1;
3223 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3224 if (OCFS2_XATTR_BUCKET_SIZE ==
3225 OCFS2_SB(inode->i_sb)->s_clustersize) {
3226 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3227 clusters_add += 1;
3228 }
3229 } else {
3230 credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
3231 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3232 struct ocfs2_extent_list *el = &def_xv.xv.xr_list;
3233 meta_add += ocfs2_extend_meta_needed(el);
3234 credits += ocfs2_calc_extend_credits(inode->i_sb,
3235 el);
3236 } else {
3237 meta_add += 1;
3238 }
3239 }
3240 out:
3241 if (clusters_need)
3242 *clusters_need = clusters_add;
3243 if (meta_need)
3244 *meta_need = meta_add;
3245 if (credits_need)
3246 *credits_need = credits;
3247 brelse(bh);
3248 return ret;
3249 }
3250
3251 static int ocfs2_init_xattr_set_ctxt(struct inode *inode,
3252 struct ocfs2_dinode *di,
3253 struct ocfs2_xattr_info *xi,
3254 struct ocfs2_xattr_search *xis,
3255 struct ocfs2_xattr_search *xbs,
3256 struct ocfs2_xattr_set_ctxt *ctxt,
3257 int extra_meta,
3258 int *credits)
3259 {
3260 int clusters_add, meta_add, ret;
3261 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3262
3263 memset(ctxt, 0, sizeof(struct ocfs2_xattr_set_ctxt));
3264
3265 ocfs2_init_dealloc_ctxt(&ctxt->dealloc);
3266
3267 ret = ocfs2_calc_xattr_set_need(inode, di, xi, xis, xbs,
3268 &clusters_add, &meta_add, credits);
3269 if (ret) {
3270 mlog_errno(ret);
3271 return ret;
3272 }
3273
3274 meta_add += extra_meta;
3275 trace_ocfs2_init_xattr_set_ctxt(xi->xi_name, meta_add,
3276 clusters_add, *credits);
3277
3278 if (meta_add) {
3279 ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add,
3280 &ctxt->meta_ac);
3281 if (ret) {
3282 mlog_errno(ret);
3283 goto out;
3284 }
3285 }
3286
3287 if (clusters_add) {
3288 ret = ocfs2_reserve_clusters(osb, clusters_add, &ctxt->data_ac);
3289 if (ret)
3290 mlog_errno(ret);
3291 }
3292 out:
3293 if (ret) {
3294 if (ctxt->meta_ac) {
3295 ocfs2_free_alloc_context(ctxt->meta_ac);
3296 ctxt->meta_ac = NULL;
3297 }
3298
3299 /*
3300 * We cannot have an error and a non null ctxt->data_ac.
3301 */
3302 }
3303
3304 return ret;
3305 }
3306
3307 static int __ocfs2_xattr_set_handle(struct inode *inode,
3308 struct ocfs2_dinode *di,
3309 struct ocfs2_xattr_info *xi,
3310 struct ocfs2_xattr_search *xis,
3311 struct ocfs2_xattr_search *xbs,
3312 struct ocfs2_xattr_set_ctxt *ctxt)
3313 {
3314 int ret = 0, credits, old_found;
3315
3316 if (!xi->xi_value) {
3317 /* Remove existing extended attribute */
3318 if (!xis->not_found)
3319 ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
3320 else if (!xbs->not_found)
3321 ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3322 } else {
3323 /* We always try to set extended attribute into inode first*/
3324 ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
3325 if (!ret && !xbs->not_found) {
3326 /*
3327 * If succeed and that extended attribute existing in
3328 * external block, then we will remove it.
3329 */
3330 xi->xi_value = NULL;
3331 xi->xi_value_len = 0;
3332
3333 old_found = xis->not_found;
3334 xis->not_found = -ENODATA;
3335 ret = ocfs2_calc_xattr_set_need(inode,
3336 di,
3337 xi,
3338 xis,
3339 xbs,
3340 NULL,
3341 NULL,
3342 &credits);
3343 xis->not_found = old_found;
3344 if (ret) {
3345 mlog_errno(ret);
3346 goto out;
3347 }
3348
3349 ret = ocfs2_extend_trans(ctxt->handle, credits);
3350 if (ret) {
3351 mlog_errno(ret);
3352 goto out;
3353 }
3354 ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3355 } else if ((ret == -ENOSPC) && !ctxt->set_abort) {
3356 if (di->i_xattr_loc && !xbs->xattr_bh) {
3357 ret = ocfs2_xattr_block_find(inode,
3358 xi->xi_name_index,
3359 xi->xi_name, xbs);
3360 if (ret)
3361 goto out;
3362
3363 old_found = xis->not_found;
3364 xis->not_found = -ENODATA;
3365 ret = ocfs2_calc_xattr_set_need(inode,
3366 di,
3367 xi,
3368 xis,
3369 xbs,
3370 NULL,
3371 NULL,
3372 &credits);
3373 xis->not_found = old_found;
3374 if (ret) {
3375 mlog_errno(ret);
3376 goto out;
3377 }
3378
3379 ret = ocfs2_extend_trans(ctxt->handle, credits);
3380 if (ret) {
3381 mlog_errno(ret);
3382 goto out;
3383 }
3384 }
3385 /*
3386 * If no space in inode, we will set extended attribute
3387 * into external block.
3388 */
3389 ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3390 if (ret)
3391 goto out;
3392 if (!xis->not_found) {
3393 /*
3394 * If succeed and that extended attribute
3395 * existing in inode, we will remove it.
3396 */
3397 xi->xi_value = NULL;
3398 xi->xi_value_len = 0;
3399 xbs->not_found = -ENODATA;
3400 ret = ocfs2_calc_xattr_set_need(inode,
3401 di,
3402 xi,
3403 xis,
3404 xbs,
3405 NULL,
3406 NULL,
3407 &credits);
3408 if (ret) {
3409 mlog_errno(ret);
3410 goto out;
3411 }
3412
3413 ret = ocfs2_extend_trans(ctxt->handle, credits);
3414 if (ret) {
3415 mlog_errno(ret);
3416 goto out;
3417 }
3418 ret = ocfs2_xattr_ibody_set(inode, xi,
3419 xis, ctxt);
3420 }
3421 }
3422 }
3423
3424 if (!ret) {
3425 /* Update inode ctime. */
3426 ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
3427 xis->inode_bh,
3428 OCFS2_JOURNAL_ACCESS_WRITE);
3429 if (ret) {
3430 mlog_errno(ret);
3431 goto out;
3432 }
3433
3434 inode->i_ctime = CURRENT_TIME;
3435 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
3436 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
3437 ocfs2_journal_dirty(ctxt->handle, xis->inode_bh);
3438 }
3439 out:
3440 return ret;
3441 }
3442
3443 /*
3444 * This function only called duing creating inode
3445 * for init security/acl xattrs of the new inode.
3446 * All transanction credits have been reserved in mknod.
3447 */
3448 int ocfs2_xattr_set_handle(handle_t *handle,
3449 struct inode *inode,
3450 struct buffer_head *di_bh,
3451 int name_index,
3452 const char *name,
3453 const void *value,
3454 size_t value_len,
3455 int flags,
3456 struct ocfs2_alloc_context *meta_ac,
3457 struct ocfs2_alloc_context *data_ac)
3458 {
3459 struct ocfs2_dinode *di;
3460 int ret;
3461
3462 struct ocfs2_xattr_info xi = {
3463 .xi_name_index = name_index,
3464 .xi_name = name,
3465 .xi_name_len = strlen(name),
3466 .xi_value = value,
3467 .xi_value_len = value_len,
3468 };
3469
3470 struct ocfs2_xattr_search xis = {
3471 .not_found = -ENODATA,
3472 };
3473
3474 struct ocfs2_xattr_search xbs = {
3475 .not_found = -ENODATA,
3476 };
3477
3478 struct ocfs2_xattr_set_ctxt ctxt = {
3479 .handle = handle,
3480 .meta_ac = meta_ac,
3481 .data_ac = data_ac,
3482 };
3483
3484 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
3485 return -EOPNOTSUPP;
3486
3487 /*
3488 * In extreme situation, may need xattr bucket when
3489 * block size is too small. And we have already reserved
3490 * the credits for bucket in mknod.
3491 */
3492 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) {
3493 xbs.bucket = ocfs2_xattr_bucket_new(inode);
3494 if (!xbs.bucket) {
3495 mlog_errno(-ENOMEM);
3496 return -ENOMEM;
3497 }
3498 }
3499
3500 xis.inode_bh = xbs.inode_bh = di_bh;
3501 di = (struct ocfs2_dinode *)di_bh->b_data;
3502
3503 down_write(&OCFS2_I(inode)->ip_xattr_sem);
3504
3505 ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
3506 if (ret)
3507 goto cleanup;
3508 if (xis.not_found) {
3509 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
3510 if (ret)
3511 goto cleanup;
3512 }
3513
3514 ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
3515
3516 cleanup:
3517 up_write(&OCFS2_I(inode)->ip_xattr_sem);
3518 brelse(xbs.xattr_bh);
3519 ocfs2_xattr_bucket_free(xbs.bucket);
3520
3521 return ret;
3522 }
3523
3524 /*
3525 * ocfs2_xattr_set()
3526 *
3527 * Set, replace or remove an extended attribute for this inode.
3528 * value is NULL to remove an existing extended attribute, else either
3529 * create or replace an extended attribute.
3530 */
3531 int ocfs2_xattr_set(struct inode *inode,
3532 int name_index,
3533 const char *name,
3534 const void *value,
3535 size_t value_len,
3536 int flags)
3537 {
3538 struct buffer_head *di_bh = NULL;
3539 struct ocfs2_dinode *di;
3540 int ret, credits, ref_meta = 0, ref_credits = 0;
3541 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3542 struct inode *tl_inode = osb->osb_tl_inode;
3543 struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, NULL, };
3544 struct ocfs2_refcount_tree *ref_tree = NULL;
3545
3546 struct ocfs2_xattr_info xi = {
3547 .xi_name_index = name_index,
3548 .xi_name = name,
3549 .xi_name_len = strlen(name),
3550 .xi_value = value,
3551 .xi_value_len = value_len,
3552 };
3553
3554 struct ocfs2_xattr_search xis = {
3555 .not_found = -ENODATA,
3556 };
3557
3558 struct ocfs2_xattr_search xbs = {
3559 .not_found = -ENODATA,
3560 };
3561
3562 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
3563 return -EOPNOTSUPP;
3564
3565 /*
3566 * Only xbs will be used on indexed trees. xis doesn't need a
3567 * bucket.
3568 */
3569 xbs.bucket = ocfs2_xattr_bucket_new(inode);
3570 if (!xbs.bucket) {
3571 mlog_errno(-ENOMEM);
3572 return -ENOMEM;
3573 }
3574
3575 ret = ocfs2_inode_lock(inode, &di_bh, 1);
3576 if (ret < 0) {
3577 mlog_errno(ret);
3578 goto cleanup_nolock;
3579 }
3580 xis.inode_bh = xbs.inode_bh = di_bh;
3581 di = (struct ocfs2_dinode *)di_bh->b_data;
3582
3583 down_write(&OCFS2_I(inode)->ip_xattr_sem);
3584 /*
3585 * Scan inode and external block to find the same name
3586 * extended attribute and collect search information.
3587 */
3588 ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
3589 if (ret)
3590 goto cleanup;
3591 if (xis.not_found) {
3592 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
3593 if (ret)
3594 goto cleanup;
3595 }
3596
3597 if (xis.not_found && xbs.not_found) {
3598 ret = -ENODATA;
3599 if (flags & XATTR_REPLACE)
3600 goto cleanup;
3601 ret = 0;
3602 if (!value)
3603 goto cleanup;
3604 } else {
3605 ret = -EEXIST;
3606 if (flags & XATTR_CREATE)
3607 goto cleanup;
3608 }
3609
3610 /* Check whether the value is refcounted and do some preparation. */
3611 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL &&
3612 (!xis.not_found || !xbs.not_found)) {
3613 ret = ocfs2_prepare_refcount_xattr(inode, di, &xi,
3614 &xis, &xbs, &ref_tree,
3615 &ref_meta, &ref_credits);
3616 if (ret) {
3617 mlog_errno(ret);
3618 goto cleanup;
3619 }
3620 }
3621
3622 inode_lock(tl_inode);
3623
3624 if (ocfs2_truncate_log_needs_flush(osb)) {
3625 ret = __ocfs2_flush_truncate_log(osb);
3626 if (ret < 0) {
3627 inode_unlock(tl_inode);
3628 mlog_errno(ret);
3629 goto cleanup;
3630 }
3631 }
3632 inode_unlock(tl_inode);
3633
3634 ret = ocfs2_init_xattr_set_ctxt(inode, di, &xi, &xis,
3635 &xbs, &ctxt, ref_meta, &credits);
3636 if (ret) {
3637 mlog_errno(ret);
3638 goto cleanup;
3639 }
3640
3641 /* we need to update inode's ctime field, so add credit for it. */
3642 credits += OCFS2_INODE_UPDATE_CREDITS;
3643 ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
3644 if (IS_ERR(ctxt.handle)) {
3645 ret = PTR_ERR(ctxt.handle);
3646 mlog_errno(ret);
3647 goto out_free_ac;
3648 }
3649
3650 ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
3651 ocfs2_update_inode_fsync_trans(ctxt.handle, inode, 0);
3652
3653 ocfs2_commit_trans(osb, ctxt.handle);
3654
3655 out_free_ac:
3656 if (ctxt.data_ac)
3657 ocfs2_free_alloc_context(ctxt.data_ac);
3658 if (ctxt.meta_ac)
3659 ocfs2_free_alloc_context(ctxt.meta_ac);
3660 if (ocfs2_dealloc_has_cluster(&ctxt.dealloc))
3661 ocfs2_schedule_truncate_log_flush(osb, 1);
3662 ocfs2_run_deallocs(osb, &ctxt.dealloc);
3663
3664 cleanup:
3665 if (ref_tree)
3666 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3667 up_write(&OCFS2_I(inode)->ip_xattr_sem);
3668 if (!value && !ret) {
3669 ret = ocfs2_try_remove_refcount_tree(inode, di_bh);
3670 if (ret)
3671 mlog_errno(ret);
3672 }
3673 ocfs2_inode_unlock(inode, 1);
3674 cleanup_nolock:
3675 brelse(di_bh);
3676 brelse(xbs.xattr_bh);
3677 ocfs2_xattr_bucket_free(xbs.bucket);
3678
3679 return ret;
3680 }
3681
3682 /*
3683 * Find the xattr extent rec which may contains name_hash.
3684 * e_cpos will be the first name hash of the xattr rec.
3685 * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
3686 */
3687 static int ocfs2_xattr_get_rec(struct inode *inode,
3688 u32 name_hash,
3689 u64 *p_blkno,
3690 u32 *e_cpos,
3691 u32 *num_clusters,
3692 struct ocfs2_extent_list *el)
3693 {
3694 int ret = 0, i;
3695 struct buffer_head *eb_bh = NULL;
3696 struct ocfs2_extent_block *eb;
3697 struct ocfs2_extent_rec *rec = NULL;
3698 u64 e_blkno = 0;
3699
3700 if (el->l_tree_depth) {
3701 ret = ocfs2_find_leaf(INODE_CACHE(inode), el, name_hash,
3702 &eb_bh);
3703 if (ret) {
3704 mlog_errno(ret);
3705 goto out;
3706 }
3707
3708 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
3709 el = &eb->h_list;
3710
3711 if (el->l_tree_depth) {
3712 ret = ocfs2_error(inode->i_sb,
3713 "Inode %lu has non zero tree depth in xattr tree block %llu\n",
3714 inode->i_ino,
3715 (unsigned long long)eb_bh->b_blocknr);
3716 goto out;
3717 }
3718 }
3719
3720 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
3721 rec = &el->l_recs[i];
3722
3723 if (le32_to_cpu(rec->e_cpos) <= name_hash) {
3724 e_blkno = le64_to_cpu(rec->e_blkno);
3725 break;
3726 }
3727 }
3728
3729 if (!e_blkno) {
3730 ret = ocfs2_error(inode->i_sb, "Inode %lu has bad extent record (%u, %u, 0) in xattr\n",
3731 inode->i_ino,
3732 le32_to_cpu(rec->e_cpos),
3733 ocfs2_rec_clusters(el, rec));
3734 goto out;
3735 }
3736
3737 *p_blkno = le64_to_cpu(rec->e_blkno);
3738 *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
3739 if (e_cpos)
3740 *e_cpos = le32_to_cpu(rec->e_cpos);
3741 out:
3742 brelse(eb_bh);
3743 return ret;
3744 }
3745
3746 typedef int (xattr_bucket_func)(struct inode *inode,
3747 struct ocfs2_xattr_bucket *bucket,
3748 void *para);
3749
3750 static int ocfs2_find_xe_in_bucket(struct inode *inode,
3751 struct ocfs2_xattr_bucket *bucket,
3752 int name_index,
3753 const char *name,
3754 u32 name_hash,
3755 u16 *xe_index,
3756 int *found)
3757 {
3758 int i, ret = 0, cmp = 1, block_off, new_offset;
3759 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
3760 size_t name_len = strlen(name);
3761 struct ocfs2_xattr_entry *xe = NULL;
3762 char *xe_name;
3763
3764 /*
3765 * We don't use binary search in the bucket because there
3766 * may be multiple entries with the same name hash.
3767 */
3768 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3769 xe = &xh->xh_entries[i];
3770
3771 if (name_hash > le32_to_cpu(xe->xe_name_hash))
3772 continue;
3773 else if (name_hash < le32_to_cpu(xe->xe_name_hash))
3774 break;
3775
3776 cmp = name_index - ocfs2_xattr_get_type(xe);
3777 if (!cmp)
3778 cmp = name_len - xe->xe_name_len;
3779 if (cmp)
3780 continue;
3781
3782 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3783 xh,
3784 i,
3785 &block_off,
3786 &new_offset);
3787 if (ret) {
3788 mlog_errno(ret);
3789 break;
3790 }
3791
3792
3793 xe_name = bucket_block(bucket, block_off) + new_offset;
3794 if (!memcmp(name, xe_name, name_len)) {
3795 *xe_index = i;
3796 *found = 1;
3797 ret = 0;
3798 break;
3799 }
3800 }
3801
3802 return ret;
3803 }
3804
3805 /*
3806 * Find the specified xattr entry in a series of buckets.
3807 * This series start from p_blkno and last for num_clusters.
3808 * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
3809 * the num of the valid buckets.
3810 *
3811 * Return the buffer_head this xattr should reside in. And if the xattr's
3812 * hash is in the gap of 2 buckets, return the lower bucket.
3813 */
3814 static int ocfs2_xattr_bucket_find(struct inode *inode,
3815 int name_index,
3816 const char *name,
3817 u32 name_hash,
3818 u64 p_blkno,
3819 u32 first_hash,
3820 u32 num_clusters,
3821 struct ocfs2_xattr_search *xs)
3822 {
3823 int ret, found = 0;
3824 struct ocfs2_xattr_header *xh = NULL;
3825 struct ocfs2_xattr_entry *xe = NULL;
3826 u16 index = 0;
3827 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3828 int low_bucket = 0, bucket, high_bucket;
3829 struct ocfs2_xattr_bucket *search;
3830 u32 last_hash;
3831 u64 blkno, lower_blkno = 0;
3832
3833 search = ocfs2_xattr_bucket_new(inode);
3834 if (!search) {
3835 ret = -ENOMEM;
3836 mlog_errno(ret);
3837 goto out;
3838 }
3839
3840 ret = ocfs2_read_xattr_bucket(search, p_blkno);
3841 if (ret) {
3842 mlog_errno(ret);
3843 goto out;
3844 }
3845
3846 xh = bucket_xh(search);
3847 high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
3848 while (low_bucket <= high_bucket) {
3849 ocfs2_xattr_bucket_relse(search);
3850
3851 bucket = (low_bucket + high_bucket) / 2;
3852 blkno = p_blkno + bucket * blk_per_bucket;
3853 ret = ocfs2_read_xattr_bucket(search, blkno);
3854 if (ret) {
3855 mlog_errno(ret);
3856 goto out;
3857 }
3858
3859 xh = bucket_xh(search);
3860 xe = &xh->xh_entries[0];
3861 if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
3862 high_bucket = bucket - 1;
3863 continue;
3864 }
3865
3866 /*
3867 * Check whether the hash of the last entry in our
3868 * bucket is larger than the search one. for an empty
3869 * bucket, the last one is also the first one.
3870 */
3871 if (xh->xh_count)
3872 xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
3873
3874 last_hash = le32_to_cpu(xe->xe_name_hash);
3875
3876 /* record lower_blkno which may be the insert place. */
3877 lower_blkno = blkno;
3878
3879 if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
3880 low_bucket = bucket + 1;
3881 continue;
3882 }
3883
3884 /* the searched xattr should reside in this bucket if exists. */
3885 ret = ocfs2_find_xe_in_bucket(inode, search,
3886 name_index, name, name_hash,
3887 &index, &found);
3888 if (ret) {
3889 mlog_errno(ret);
3890 goto out;
3891 }
3892 break;
3893 }
3894
3895 /*
3896 * Record the bucket we have found.
3897 * When the xattr's hash value is in the gap of 2 buckets, we will
3898 * always set it to the previous bucket.
3899 */
3900 if (!lower_blkno)
3901 lower_blkno = p_blkno;
3902
3903 /* This should be in cache - we just read it during the search */
3904 ret = ocfs2_read_xattr_bucket(xs->bucket, lower_blkno);
3905 if (ret) {
3906 mlog_errno(ret);
3907 goto out;
3908 }
3909
3910 xs->header = bucket_xh(xs->bucket);
3911 xs->base = bucket_block(xs->bucket, 0);
3912 xs->end = xs->base + inode->i_sb->s_blocksize;
3913
3914 if (found) {
3915 xs->here = &xs->header->xh_entries[index];
3916 trace_ocfs2_xattr_bucket_find(OCFS2_I(inode)->ip_blkno,
3917 name, name_index, name_hash,
3918 (unsigned long long)bucket_blkno(xs->bucket),
3919 index);
3920 } else
3921 ret = -ENODATA;
3922
3923 out:
3924 ocfs2_xattr_bucket_free(search);
3925 return ret;
3926 }
3927
3928 static int ocfs2_xattr_index_block_find(struct inode *inode,
3929 struct buffer_head *root_bh,
3930 int name_index,
3931 const char *name,
3932 struct ocfs2_xattr_search *xs)
3933 {
3934 int ret;
3935 struct ocfs2_xattr_block *xb =
3936 (struct ocfs2_xattr_block *)root_bh->b_data;
3937 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3938 struct ocfs2_extent_list *el = &xb_root->xt_list;
3939 u64 p_blkno = 0;
3940 u32 first_hash, num_clusters = 0;
3941 u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
3942
3943 if (le16_to_cpu(el->l_next_free_rec) == 0)
3944 return -ENODATA;
3945
3946 trace_ocfs2_xattr_index_block_find(OCFS2_I(inode)->ip_blkno,
3947 name, name_index, name_hash,
3948 (unsigned long long)root_bh->b_blocknr,
3949 -1);
3950
3951 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
3952 &num_clusters, el);
3953 if (ret) {
3954 mlog_errno(ret);
3955 goto out;
3956 }
3957
3958 BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
3959
3960 trace_ocfs2_xattr_index_block_find_rec(OCFS2_I(inode)->ip_blkno,
3961 name, name_index, first_hash,
3962 (unsigned long long)p_blkno,
3963 num_clusters);
3964
3965 ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
3966 p_blkno, first_hash, num_clusters, xs);
3967
3968 out:
3969 return ret;
3970 }
3971
3972 static int ocfs2_iterate_xattr_buckets(struct inode *inode,
3973 u64 blkno,
3974 u32 clusters,
3975 xattr_bucket_func *func,
3976 void *para)
3977 {
3978 int i, ret = 0;
3979 u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
3980 u32 num_buckets = clusters * bpc;
3981 struct ocfs2_xattr_bucket *bucket;
3982
3983 bucket = ocfs2_xattr_bucket_new(inode);
3984 if (!bucket) {
3985 mlog_errno(-ENOMEM);
3986 return -ENOMEM;
3987 }
3988
3989 trace_ocfs2_iterate_xattr_buckets(
3990 (unsigned long long)OCFS2_I(inode)->ip_blkno,
3991 (unsigned long long)blkno, clusters);
3992
3993 for (i = 0; i < num_buckets; i++, blkno += bucket->bu_blocks) {
3994 ret = ocfs2_read_xattr_bucket(bucket, blkno);
3995 if (ret) {
3996 mlog_errno(ret);
3997 break;
3998 }
3999
4000 /*
4001 * The real bucket num in this series of blocks is stored
4002 * in the 1st bucket.
4003 */
4004 if (i == 0)
4005 num_buckets = le16_to_cpu(bucket_xh(bucket)->xh_num_buckets);
4006
4007 trace_ocfs2_iterate_xattr_bucket((unsigned long long)blkno,
4008 le32_to_cpu(bucket_xh(bucket)->xh_entries[0].xe_name_hash));
4009 if (func) {
4010 ret = func(inode, bucket, para);
4011 if (ret && ret != -ERANGE)
4012 mlog_errno(ret);
4013 /* Fall through to bucket_relse() */
4014 }
4015
4016 ocfs2_xattr_bucket_relse(bucket);
4017 if (ret)
4018 break;
4019 }
4020
4021 ocfs2_xattr_bucket_free(bucket);
4022 return ret;
4023 }
4024
4025 struct ocfs2_xattr_tree_list {
4026 char *buffer;
4027 size_t buffer_size;
4028 size_t result;
4029 };
4030
4031 static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
4032 struct ocfs2_xattr_header *xh,
4033 int index,
4034 int *block_off,
4035 int *new_offset)
4036 {
4037 u16 name_offset;
4038
4039 if (index < 0 || index >= le16_to_cpu(xh->xh_count))
4040 return -EINVAL;
4041
4042 name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
4043
4044 *block_off = name_offset >> sb->s_blocksize_bits;
4045 *new_offset = name_offset % sb->s_blocksize;
4046
4047 return 0;
4048 }
4049
4050 static int ocfs2_list_xattr_bucket(struct inode *inode,
4051 struct ocfs2_xattr_bucket *bucket,
4052 void *para)
4053 {
4054 int ret = 0, type;
4055 struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
4056 int i, block_off, new_offset;
4057 const char *name;
4058
4059 for (i = 0 ; i < le16_to_cpu(bucket_xh(bucket)->xh_count); i++) {
4060 struct ocfs2_xattr_entry *entry = &bucket_xh(bucket)->xh_entries[i];
4061 type = ocfs2_xattr_get_type(entry);
4062
4063 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
4064 bucket_xh(bucket),
4065 i,
4066 &block_off,
4067 &new_offset);
4068 if (ret)
4069 break;
4070
4071 name = (const char *)bucket_block(bucket, block_off) +
4072 new_offset;
4073 ret = ocfs2_xattr_list_entry(inode->i_sb,
4074 xl->buffer,
4075 xl->buffer_size,
4076 &xl->result,
4077 type, name,
4078 entry->xe_name_len);
4079 if (ret)
4080 break;
4081 }
4082
4083 return ret;
4084 }
4085
4086 static int ocfs2_iterate_xattr_index_block(struct inode *inode,
4087 struct buffer_head *blk_bh,
4088 xattr_tree_rec_func *rec_func,
4089 void *para)
4090 {
4091 struct ocfs2_xattr_block *xb =
4092 (struct ocfs2_xattr_block *)blk_bh->b_data;
4093 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
4094 int ret = 0;
4095 u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
4096 u64 p_blkno = 0;
4097
4098 if (!el->l_next_free_rec || !rec_func)
4099 return 0;
4100
4101 while (name_hash > 0) {
4102 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
4103 &e_cpos, &num_clusters, el);
4104 if (ret) {
4105 mlog_errno(ret);
4106 break;
4107 }
4108
4109 ret = rec_func(inode, blk_bh, p_blkno, e_cpos,
4110 num_clusters, para);
4111 if (ret) {
4112 if (ret != -ERANGE)
4113 mlog_errno(ret);
4114 break;
4115 }
4116
4117 if (e_cpos == 0)
4118 break;
4119
4120 name_hash = e_cpos - 1;
4121 }
4122
4123 return ret;
4124
4125 }
4126
4127 static int ocfs2_list_xattr_tree_rec(struct inode *inode,
4128 struct buffer_head *root_bh,
4129 u64 blkno, u32 cpos, u32 len, void *para)
4130 {
4131 return ocfs2_iterate_xattr_buckets(inode, blkno, len,
4132 ocfs2_list_xattr_bucket, para);
4133 }
4134
4135 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
4136 struct buffer_head *blk_bh,
4137 char *buffer,
4138 size_t buffer_size)
4139 {
4140 int ret;
4141 struct ocfs2_xattr_tree_list xl = {
4142 .buffer = buffer,
4143 .buffer_size = buffer_size,
4144 .result = 0,
4145 };
4146
4147 ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
4148 ocfs2_list_xattr_tree_rec, &xl);
4149 if (ret) {
4150 mlog_errno(ret);
4151 goto out;
4152 }
4153
4154 ret = xl.result;
4155 out:
4156 return ret;
4157 }
4158
4159 static int cmp_xe(const void *a, const void *b)
4160 {
4161 const struct ocfs2_xattr_entry *l = a, *r = b;
4162 u32 l_hash = le32_to_cpu(l->xe_name_hash);
4163 u32 r_hash = le32_to_cpu(r->xe_name_hash);
4164
4165 if (l_hash > r_hash)
4166 return 1;
4167 if (l_hash < r_hash)
4168 return -1;
4169 return 0;
4170 }
4171
4172 static void swap_xe(void *a, void *b, int size)
4173 {
4174 struct ocfs2_xattr_entry *l = a, *r = b, tmp;
4175
4176 tmp = *l;
4177 memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
4178 memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
4179 }
4180
4181 /*
4182 * When the ocfs2_xattr_block is filled up, new bucket will be created
4183 * and all the xattr entries will be moved to the new bucket.
4184 * The header goes at the start of the bucket, and the names+values are
4185 * filled from the end. This is why *target starts as the last buffer.
4186 * Note: we need to sort the entries since they are not saved in order
4187 * in the ocfs2_xattr_block.
4188 */
4189 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
4190 struct buffer_head *xb_bh,
4191 struct ocfs2_xattr_bucket *bucket)
4192 {
4193 int i, blocksize = inode->i_sb->s_blocksize;
4194 int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4195 u16 offset, size, off_change;
4196 struct ocfs2_xattr_entry *xe;
4197 struct ocfs2_xattr_block *xb =
4198 (struct ocfs2_xattr_block *)xb_bh->b_data;
4199 struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
4200 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
4201 u16 count = le16_to_cpu(xb_xh->xh_count);
4202 char *src = xb_bh->b_data;
4203 char *target = bucket_block(bucket, blks - 1);
4204
4205 trace_ocfs2_cp_xattr_block_to_bucket_begin(
4206 (unsigned long long)xb_bh->b_blocknr,
4207 (unsigned long long)bucket_blkno(bucket));
4208
4209 for (i = 0; i < blks; i++)
4210 memset(bucket_block(bucket, i), 0, blocksize);
4211
4212 /*
4213 * Since the xe_name_offset is based on ocfs2_xattr_header,
4214 * there is a offset change corresponding to the change of
4215 * ocfs2_xattr_header's position.
4216 */
4217 off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
4218 xe = &xb_xh->xh_entries[count - 1];
4219 offset = le16_to_cpu(xe->xe_name_offset) + off_change;
4220 size = blocksize - offset;
4221
4222 /* copy all the names and values. */
4223 memcpy(target + offset, src + offset, size);
4224
4225 /* Init new header now. */
4226 xh->xh_count = xb_xh->xh_count;
4227 xh->xh_num_buckets = cpu_to_le16(1);
4228 xh->xh_name_value_len = cpu_to_le16(size);
4229 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
4230
4231 /* copy all the entries. */
4232 target = bucket_block(bucket, 0);
4233 offset = offsetof(struct ocfs2_xattr_header, xh_entries);
4234 size = count * sizeof(struct ocfs2_xattr_entry);
4235 memcpy(target + offset, (char *)xb_xh + offset, size);
4236
4237 /* Change the xe offset for all the xe because of the move. */
4238 off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
4239 offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
4240 for (i = 0; i < count; i++)
4241 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
4242
4243 trace_ocfs2_cp_xattr_block_to_bucket_end(offset, size, off_change);
4244
4245 sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
4246 cmp_xe, swap_xe);
4247 }
4248
4249 /*
4250 * After we move xattr from block to index btree, we have to
4251 * update ocfs2_xattr_search to the new xe and base.
4252 *
4253 * When the entry is in xattr block, xattr_bh indicates the storage place.
4254 * While if the entry is in index b-tree, "bucket" indicates the
4255 * real place of the xattr.
4256 */
4257 static void ocfs2_xattr_update_xattr_search(struct inode *inode,
4258 struct ocfs2_xattr_search *xs,
4259 struct buffer_head *old_bh)
4260 {
4261 char *buf = old_bh->b_data;
4262 struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
4263 struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
4264 int i;
4265
4266 xs->header = bucket_xh(xs->bucket);
4267 xs->base = bucket_block(xs->bucket, 0);
4268 xs->end = xs->base + inode->i_sb->s_blocksize;
4269
4270 if (xs->not_found)
4271 return;
4272
4273 i = xs->here - old_xh->xh_entries;
4274 xs->here = &xs->header->xh_entries[i];
4275 }
4276
4277 static int ocfs2_xattr_create_index_block(struct inode *inode,
4278 struct ocfs2_xattr_search *xs,
4279 struct ocfs2_xattr_set_ctxt *ctxt)
4280 {
4281 int ret;
4282 u32 bit_off, len;
4283 u64 blkno;
4284 handle_t *handle = ctxt->handle;
4285 struct ocfs2_inode_info *oi = OCFS2_I(inode);
4286 struct buffer_head *xb_bh = xs->xattr_bh;
4287 struct ocfs2_xattr_block *xb =
4288 (struct ocfs2_xattr_block *)xb_bh->b_data;
4289 struct ocfs2_xattr_tree_root *xr;
4290 u16 xb_flags = le16_to_cpu(xb->xb_flags);
4291
4292 trace_ocfs2_xattr_create_index_block_begin(
4293 (unsigned long long)xb_bh->b_blocknr);
4294
4295 BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
4296 BUG_ON(!xs->bucket);
4297
4298 /*
4299 * XXX:
4300 * We can use this lock for now, and maybe move to a dedicated mutex
4301 * if performance becomes a problem later.
4302 */
4303 down_write(&oi->ip_alloc_sem);
4304
4305 ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), xb_bh,
4306 OCFS2_JOURNAL_ACCESS_WRITE);
4307 if (ret) {
4308 mlog_errno(ret);
4309 goto out;
4310 }
4311
4312 ret = __ocfs2_claim_clusters(handle, ctxt->data_ac,
4313 1, 1, &bit_off, &len);
4314 if (ret) {
4315 mlog_errno(ret);
4316 goto out;
4317 }
4318
4319 /*
4320 * The bucket may spread in many blocks, and
4321 * we will only touch the 1st block and the last block
4322 * in the whole bucket(one for entry and one for data).
4323 */
4324 blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
4325
4326 trace_ocfs2_xattr_create_index_block((unsigned long long)blkno);
4327
4328 ret = ocfs2_init_xattr_bucket(xs->bucket, blkno, 1);
4329 if (ret) {
4330 mlog_errno(ret);
4331 goto out;
4332 }
4333
4334 ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
4335 OCFS2_JOURNAL_ACCESS_CREATE);
4336 if (ret) {
4337 mlog_errno(ret);
4338 goto out;
4339 }
4340
4341 ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xs->bucket);
4342 ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
4343
4344 ocfs2_xattr_update_xattr_search(inode, xs, xb_bh);
4345
4346 /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
4347 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
4348 offsetof(struct ocfs2_xattr_block, xb_attrs));
4349
4350 xr = &xb->xb_attrs.xb_root;
4351 xr->xt_clusters = cpu_to_le32(1);
4352 xr->xt_last_eb_blk = 0;
4353 xr->xt_list.l_tree_depth = 0;
4354 xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
4355 xr->xt_list.l_next_free_rec = cpu_to_le16(1);
4356
4357 xr->xt_list.l_recs[0].e_cpos = 0;
4358 xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
4359 xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
4360
4361 xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
4362
4363 ocfs2_journal_dirty(handle, xb_bh);
4364
4365 out:
4366 up_write(&oi->ip_alloc_sem);
4367
4368 return ret;
4369 }
4370
4371 static int cmp_xe_offset(const void *a, const void *b)
4372 {
4373 const struct ocfs2_xattr_entry *l = a, *r = b;
4374 u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
4375 u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
4376
4377 if (l_name_offset < r_name_offset)
4378 return 1;
4379 if (l_name_offset > r_name_offset)
4380 return -1;
4381 return 0;
4382 }
4383
4384 /*
4385 * defrag a xattr bucket if we find that the bucket has some
4386 * holes beteen name/value pairs.
4387 * We will move all the name/value pairs to the end of the bucket
4388 * so that we can spare some space for insertion.
4389 */
4390 static int ocfs2_defrag_xattr_bucket(struct inode *inode,
4391 handle_t *handle,
4392 struct ocfs2_xattr_bucket *bucket)
4393 {
4394 int ret, i;
4395 size_t end, offset, len;
4396 struct ocfs2_xattr_header *xh;
4397 char *entries, *buf, *bucket_buf = NULL;
4398 u64 blkno = bucket_blkno(bucket);
4399 u16 xh_free_start;
4400 size_t blocksize = inode->i_sb->s_blocksize;
4401 struct ocfs2_xattr_entry *xe;
4402
4403 /*
4404 * In order to make the operation more efficient and generic,
4405 * we copy all the blocks into a contiguous memory and do the
4406 * defragment there, so if anything is error, we will not touch
4407 * the real block.
4408 */
4409 bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
4410 if (!bucket_buf) {
4411 ret = -EIO;
4412 goto out;
4413 }
4414
4415 buf = bucket_buf;
4416 for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
4417 memcpy(buf, bucket_block(bucket, i), blocksize);
4418
4419 ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
4420 OCFS2_JOURNAL_ACCESS_WRITE);
4421 if (ret < 0) {
4422 mlog_errno(ret);
4423 goto out;
4424 }
4425
4426 xh = (struct ocfs2_xattr_header *)bucket_buf;
4427 entries = (char *)xh->xh_entries;
4428 xh_free_start = le16_to_cpu(xh->xh_free_start);
4429
4430 trace_ocfs2_defrag_xattr_bucket(
4431 (unsigned long long)blkno, le16_to_cpu(xh->xh_count),
4432 xh_free_start, le16_to_cpu(xh->xh_name_value_len));
4433
4434 /*
4435 * sort all the entries by their offset.
4436 * the largest will be the first, so that we can
4437 * move them to the end one by one.
4438 */
4439 sort(entries, le16_to_cpu(xh->xh_count),
4440 sizeof(struct ocfs2_xattr_entry),
4441 cmp_xe_offset, swap_xe);
4442
4443 /* Move all name/values to the end of the bucket. */
4444 xe = xh->xh_entries;
4445 end = OCFS2_XATTR_BUCKET_SIZE;
4446 for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
4447 offset = le16_to_cpu(xe->xe_name_offset);
4448 len = namevalue_size_xe(xe);
4449
4450 /*
4451 * We must make sure that the name/value pair
4452 * exist in the same block. So adjust end to
4453 * the previous block end if needed.
4454 */
4455 if (((end - len) / blocksize !=
4456 (end - 1) / blocksize))
4457 end = end - end % blocksize;
4458
4459 if (end > offset + len) {
4460 memmove(bucket_buf + end - len,
4461 bucket_buf + offset, len);
4462 xe->xe_name_offset = cpu_to_le16(end - len);
4463 }
4464
4465 mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
4466 "bucket %llu\n", (unsigned long long)blkno);
4467
4468 end -= len;
4469 }
4470
4471 mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
4472 "bucket %llu\n", (unsigned long long)blkno);
4473
4474 if (xh_free_start == end)
4475 goto out;
4476
4477 memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
4478 xh->xh_free_start = cpu_to_le16(end);
4479
4480 /* sort the entries by their name_hash. */
4481 sort(entries, le16_to_cpu(xh->xh_count),
4482 sizeof(struct ocfs2_xattr_entry),
4483 cmp_xe, swap_xe);
4484
4485 buf = bucket_buf;
4486 for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
4487 memcpy(bucket_block(bucket, i), buf, blocksize);
4488 ocfs2_xattr_bucket_journal_dirty(handle, bucket);
4489
4490 out:
4491 kfree(bucket_buf);
4492 return ret;
4493 }
4494
4495 /*
4496 * prev_blkno points to the start of an existing extent. new_blkno
4497 * points to a newly allocated extent. Because we know each of our
4498 * clusters contains more than bucket, we can easily split one cluster
4499 * at a bucket boundary. So we take the last cluster of the existing
4500 * extent and split it down the middle. We move the last half of the
4501 * buckets in the last cluster of the existing extent over to the new
4502 * extent.
4503 *
4504 * first_bh is the buffer at prev_blkno so we can update the existing
4505 * extent's bucket count. header_bh is the bucket were we were hoping
4506 * to insert our xattr. If the bucket move places the target in the new
4507 * extent, we'll update first_bh and header_bh after modifying the old
4508 * extent.
4509 *
4510 * first_hash will be set as the 1st xe's name_hash in the new extent.
4511 */
4512 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
4513 handle_t *handle,
4514 struct ocfs2_xattr_bucket *first,
4515 struct ocfs2_xattr_bucket *target,
4516 u64 new_blkno,
4517 u32 num_clusters,
4518 u32 *first_hash)
4519 {
4520 int ret;
4521 struct super_block *sb = inode->i_sb;
4522 int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(sb);
4523 int num_buckets = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(sb));
4524 int to_move = num_buckets / 2;
4525 u64 src_blkno;
4526 u64 last_cluster_blkno = bucket_blkno(first) +
4527 ((num_clusters - 1) * ocfs2_clusters_to_blocks(sb, 1));
4528
4529 BUG_ON(le16_to_cpu(bucket_xh(first)->xh_num_buckets) < num_buckets);
4530 BUG_ON(OCFS2_XATTR_BUCKET_SIZE == OCFS2_SB(sb)->s_clustersize);
4531
4532 trace_ocfs2_mv_xattr_bucket_cross_cluster(
4533 (unsigned long long)last_cluster_blkno,
4534 (unsigned long long)new_blkno);
4535
4536 ret = ocfs2_mv_xattr_buckets(inode, handle, bucket_blkno(first),
4537 last_cluster_blkno, new_blkno,
4538 to_move, first_hash);
4539 if (ret) {
4540 mlog_errno(ret);
4541 goto out;
4542 }
4543
4544 /* This is the first bucket that got moved */
4545 src_blkno = last_cluster_blkno + (to_move * blks_per_bucket);
4546
4547 /*
4548 * If the target bucket was part of the moved buckets, we need to
4549 * update first and target.
4550 */
4551 if (bucket_blkno(target) >= src_blkno) {
4552 /* Find the block for the new target bucket */
4553 src_blkno = new_blkno +
4554 (bucket_blkno(target) - src_blkno);
4555
4556 ocfs2_xattr_bucket_relse(first);
4557 ocfs2_xattr_bucket_relse(target);
4558
4559 /*
4560 * These shouldn't fail - the buffers are in the
4561 * journal from ocfs2_cp_xattr_bucket().
4562 */
4563 ret = ocfs2_read_xattr_bucket(first, new_blkno);
4564 if (ret) {
4565 mlog_errno(ret);
4566 goto out;
4567 }
4568 ret = ocfs2_read_xattr_bucket(target, src_blkno);
4569 if (ret)
4570 mlog_errno(ret);
4571
4572 }
4573
4574 out:
4575 return ret;
4576 }
4577
4578 /*
4579 * Find the suitable pos when we divide a bucket into 2.
4580 * We have to make sure the xattrs with the same hash value exist
4581 * in the same bucket.
4582 *
4583 * If this ocfs2_xattr_header covers more than one hash value, find a
4584 * place where the hash value changes. Try to find the most even split.
4585 * The most common case is that all entries have different hash values,
4586 * and the first check we make will find a place to split.
4587 */
4588 static int ocfs2_xattr_find_divide_pos(struct ocfs2_xattr_header *xh)
4589 {
4590 struct ocfs2_xattr_entry *entries = xh->xh_entries;
4591 int count = le16_to_cpu(xh->xh_count);
4592 int delta, middle = count / 2;
4593
4594 /*
4595 * We start at the middle. Each step gets farther away in both
4596 * directions. We therefore hit the change in hash value
4597 * nearest to the middle. Note that this loop does not execute for
4598 * count < 2.
4599 */
4600 for (delta = 0; delta < middle; delta++) {
4601 /* Let's check delta earlier than middle */
4602 if (cmp_xe(&entries[middle - delta - 1],
4603 &entries[middle - delta]))
4604 return middle - delta;
4605
4606 /* For even counts, don't walk off the end */
4607 if ((middle + delta + 1) == count)
4608 continue;
4609
4610 /* Now try delta past middle */
4611 if (cmp_xe(&entries[middle + delta],
4612 &entries[middle + delta + 1]))
4613 return middle + delta + 1;
4614 }
4615
4616 /* Every entry had the same hash */
4617 return count;
4618 }
4619
4620 /*
4621 * Move some xattrs in old bucket(blk) to new bucket(new_blk).
4622 * first_hash will record the 1st hash of the new bucket.
4623 *
4624 * Normally half of the xattrs will be moved. But we have to make
4625 * sure that the xattrs with the same hash value are stored in the
4626 * same bucket. If all the xattrs in this bucket have the same hash
4627 * value, the new bucket will be initialized as an empty one and the
4628 * first_hash will be initialized as (hash_value+1).
4629 */
4630 static int ocfs2_divide_xattr_bucket(struct inode *inode,
4631 handle_t *handle,
4632 u64 blk,
4633 u64 new_blk,
4634 u32 *first_hash,
4635 int new_bucket_head)
4636 {
4637 int ret, i;
4638 int count, start, len, name_value_len = 0, name_offset = 0;
4639 struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
4640 struct ocfs2_xattr_header *xh;
4641 struct ocfs2_xattr_entry *xe;
4642 int blocksize = inode->i_sb->s_blocksize;
4643
4644 trace_ocfs2_divide_xattr_bucket_begin((unsigned long long)blk,
4645 (unsigned long long)new_blk);
4646
4647 s_bucket = ocfs2_xattr_bucket_new(inode);
4648 t_bucket = ocfs2_xattr_bucket_new(inode);
4649 if (!s_bucket || !t_bucket) {
4650 ret = -ENOMEM;
4651 mlog_errno(ret);
4652 goto out;
4653 }
4654
4655 ret = ocfs2_read_xattr_bucket(s_bucket, blk);
4656 if (ret) {
4657 mlog_errno(ret);
4658 goto out;
4659 }
4660
4661 ret = ocfs2_xattr_bucket_journal_access(handle, s_bucket,
4662 OCFS2_JOURNAL_ACCESS_WRITE);
4663 if (ret) {
4664 mlog_errno(ret);
4665 goto out;
4666 }
4667
4668 /*
4669 * Even if !new_bucket_head, we're overwriting t_bucket. Thus,
4670 * there's no need to read it.
4671 */
4672 ret = ocfs2_init_xattr_bucket(t_bucket, new_blk, new_bucket_head);
4673 if (ret) {
4674 mlog_errno(ret);
4675 goto out;
4676 }
4677
4678 /*
4679 * Hey, if we're overwriting t_bucket, what difference does
4680 * ACCESS_CREATE vs ACCESS_WRITE make? See the comment in the
4681 * same part of ocfs2_cp_xattr_bucket().
4682 */
4683 ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4684 new_bucket_head ?
4685 OCFS2_JOURNAL_ACCESS_CREATE :
4686 OCFS2_JOURNAL_ACCESS_WRITE);
4687 if (ret) {
4688 mlog_errno(ret);
4689 goto out;
4690 }
4691
4692 xh = bucket_xh(s_bucket);
4693 count = le16_to_cpu(xh->xh_count);
4694 start = ocfs2_xattr_find_divide_pos(xh);
4695
4696 if (start == count) {
4697 xe = &xh->xh_entries[start-1];
4698
4699 /*
4700 * initialized a new empty bucket here.
4701 * The hash value is set as one larger than
4702 * that of the last entry in the previous bucket.
4703 */
4704 for (i = 0; i < t_bucket->bu_blocks; i++)
4705 memset(bucket_block(t_bucket, i), 0, blocksize);
4706
4707 xh = bucket_xh(t_bucket);
4708 xh->xh_free_start = cpu_to_le16(blocksize);
4709 xh->xh_entries[0].xe_name_hash = xe->xe_name_hash;
4710 le32_add_cpu(&xh->xh_entries[0].xe_name_hash, 1);
4711
4712 goto set_num_buckets;
4713 }
4714
4715 /* copy the whole bucket to the new first. */
4716 ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4717
4718 /* update the new bucket. */
4719 xh = bucket_xh(t_bucket);
4720
4721 /*
4722 * Calculate the total name/value len and xh_free_start for
4723 * the old bucket first.
4724 */
4725 name_offset = OCFS2_XATTR_BUCKET_SIZE;
4726 name_value_len = 0;
4727 for (i = 0; i < start; i++) {
4728 xe = &xh->xh_entries[i];
4729 name_value_len += namevalue_size_xe(xe);
4730 if (le16_to_cpu(xe->xe_name_offset) < name_offset)
4731 name_offset = le16_to_cpu(xe->xe_name_offset);
4732 }
4733
4734 /*
4735 * Now begin the modification to the new bucket.
4736 *
4737 * In the new bucket, We just move the xattr entry to the beginning
4738 * and don't touch the name/value. So there will be some holes in the
4739 * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
4740 * called.
4741 */
4742 xe = &xh->xh_entries[start];
4743 len = sizeof(struct ocfs2_xattr_entry) * (count - start);
4744 trace_ocfs2_divide_xattr_bucket_move(len,
4745 (int)((char *)xe - (char *)xh),
4746 (int)((char *)xh->xh_entries - (char *)xh));
4747 memmove((char *)xh->xh_entries, (char *)xe, len);
4748 xe = &xh->xh_entries[count - start];
4749 len = sizeof(struct ocfs2_xattr_entry) * start;
4750 memset((char *)xe, 0, len);
4751
4752 le16_add_cpu(&xh->xh_count, -start);
4753 le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
4754
4755 /* Calculate xh_free_start for the new bucket. */
4756 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
4757 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
4758 xe = &xh->xh_entries[i];
4759 if (le16_to_cpu(xe->xe_name_offset) <
4760 le16_to_cpu(xh->xh_free_start))
4761 xh->xh_free_start = xe->xe_name_offset;
4762 }
4763
4764 set_num_buckets:
4765 /* set xh->xh_num_buckets for the new xh. */
4766 if (new_bucket_head)
4767 xh->xh_num_buckets = cpu_to_le16(1);
4768 else
4769 xh->xh_num_buckets = 0;
4770
4771 ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4772
4773 /* store the first_hash of the new bucket. */
4774 if (first_hash)
4775 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
4776
4777 /*
4778 * Now only update the 1st block of the old bucket. If we
4779 * just added a new empty bucket, there is no need to modify
4780 * it.
4781 */
4782 if (start == count)
4783 goto out;
4784
4785 xh = bucket_xh(s_bucket);
4786 memset(&xh->xh_entries[start], 0,
4787 sizeof(struct ocfs2_xattr_entry) * (count - start));
4788 xh->xh_count = cpu_to_le16(start);
4789 xh->xh_free_start = cpu_to_le16(name_offset);
4790 xh->xh_name_value_len = cpu_to_le16(name_value_len);
4791
4792 ocfs2_xattr_bucket_journal_dirty(handle, s_bucket);
4793
4794 out:
4795 ocfs2_xattr_bucket_free(s_bucket);
4796 ocfs2_xattr_bucket_free(t_bucket);
4797
4798 return ret;
4799 }
4800
4801 /*
4802 * Copy xattr from one bucket to another bucket.
4803 *
4804 * The caller must make sure that the journal transaction
4805 * has enough space for journaling.
4806 */
4807 static int ocfs2_cp_xattr_bucket(struct inode *inode,
4808 handle_t *handle,
4809 u64 s_blkno,
4810 u64 t_blkno,
4811 int t_is_new)
4812 {
4813 int ret;
4814 struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
4815
4816 BUG_ON(s_blkno == t_blkno);
4817
4818 trace_ocfs2_cp_xattr_bucket((unsigned long long)s_blkno,
4819 (unsigned long long)t_blkno,
4820 t_is_new);
4821
4822 s_bucket = ocfs2_xattr_bucket_new(inode);
4823 t_bucket = ocfs2_xattr_bucket_new(inode);
4824 if (!s_bucket || !t_bucket) {
4825 ret = -ENOMEM;
4826 mlog_errno(ret);
4827 goto out;
4828 }
4829
4830 ret = ocfs2_read_xattr_bucket(s_bucket, s_blkno);
4831 if (ret)
4832 goto out;
4833
4834 /*
4835 * Even if !t_is_new, we're overwriting t_bucket. Thus,
4836 * there's no need to read it.
4837 */
4838 ret = ocfs2_init_xattr_bucket(t_bucket, t_blkno, t_is_new);
4839 if (ret)
4840 goto out;
4841
4842 /*
4843 * Hey, if we're overwriting t_bucket, what difference does
4844 * ACCESS_CREATE vs ACCESS_WRITE make? Well, if we allocated a new
4845 * cluster to fill, we came here from
4846 * ocfs2_mv_xattr_buckets(), and it is really new -
4847 * ACCESS_CREATE is required. But we also might have moved data
4848 * out of t_bucket before extending back into it.
4849 * ocfs2_add_new_xattr_bucket() can do this - its call to
4850 * ocfs2_add_new_xattr_cluster() may have created a new extent
4851 * and copied out the end of the old extent. Then it re-extends
4852 * the old extent back to create space for new xattrs. That's
4853 * how we get here, and the bucket isn't really new.
4854 */
4855 ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4856 t_is_new ?
4857 OCFS2_JOURNAL_ACCESS_CREATE :
4858 OCFS2_JOURNAL_ACCESS_WRITE);
4859 if (ret)
4860 goto out;
4861
4862 ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4863 ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4864
4865 out:
4866 ocfs2_xattr_bucket_free(t_bucket);
4867 ocfs2_xattr_bucket_free(s_bucket);
4868
4869 return ret;
4870 }
4871
4872 /*
4873 * src_blk points to the start of an existing extent. last_blk points to
4874 * last cluster in that extent. to_blk points to a newly allocated
4875 * extent. We copy the buckets from the cluster at last_blk to the new
4876 * extent. If start_bucket is non-zero, we skip that many buckets before
4877 * we start copying. The new extent's xh_num_buckets gets set to the
4878 * number of buckets we copied. The old extent's xh_num_buckets shrinks
4879 * by the same amount.
4880 */
4881 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
4882 u64 src_blk, u64 last_blk, u64 to_blk,
4883 unsigned int start_bucket,
4884 u32 *first_hash)
4885 {
4886 int i, ret, credits;
4887 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4888 int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4889 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
4890 struct ocfs2_xattr_bucket *old_first, *new_first;
4891
4892 trace_ocfs2_mv_xattr_buckets((unsigned long long)last_blk,
4893 (unsigned long long)to_blk);
4894
4895 BUG_ON(start_bucket >= num_buckets);
4896 if (start_bucket) {
4897 num_buckets -= start_bucket;
4898 last_blk += (start_bucket * blks_per_bucket);
4899 }
4900
4901 /* The first bucket of the original extent */
4902 old_first = ocfs2_xattr_bucket_new(inode);
4903 /* The first bucket of the new extent */
4904 new_first = ocfs2_xattr_bucket_new(inode);
4905 if (!old_first || !new_first) {
4906 ret = -ENOMEM;
4907 mlog_errno(ret);
4908 goto out;
4909 }
4910
4911 ret = ocfs2_read_xattr_bucket(old_first, src_blk);
4912 if (ret) {
4913 mlog_errno(ret);
4914 goto out;
4915 }
4916
4917 /*
4918 * We need to update the first bucket of the old extent and all
4919 * the buckets going to the new extent.
4920 */
4921 credits = ((num_buckets + 1) * blks_per_bucket);
4922 ret = ocfs2_extend_trans(handle, credits);
4923 if (ret) {
4924 mlog_errno(ret);
4925 goto out;
4926 }
4927
4928 ret = ocfs2_xattr_bucket_journal_access(handle, old_first,
4929 OCFS2_JOURNAL_ACCESS_WRITE);
4930 if (ret) {
4931 mlog_errno(ret);
4932 goto out;
4933 }
4934
4935 for (i = 0; i < num_buckets; i++) {
4936 ret = ocfs2_cp_xattr_bucket(inode, handle,
4937 last_blk + (i * blks_per_bucket),
4938 to_blk + (i * blks_per_bucket),
4939 1);
4940 if (ret) {
4941 mlog_errno(ret);
4942 goto out;
4943 }
4944 }
4945
4946 /*
4947 * Get the new bucket ready before we dirty anything
4948 * (This actually shouldn't fail, because we already dirtied
4949 * it once in ocfs2_cp_xattr_bucket()).
4950 */
4951 ret = ocfs2_read_xattr_bucket(new_first, to_blk);
4952 if (ret) {
4953 mlog_errno(ret);
4954 goto out;
4955 }
4956 ret = ocfs2_xattr_bucket_journal_access(handle, new_first,
4957 OCFS2_JOURNAL_ACCESS_WRITE);
4958 if (ret) {
4959 mlog_errno(ret);
4960 goto out;
4961 }
4962
4963 /* Now update the headers */
4964 le16_add_cpu(&bucket_xh(old_first)->xh_num_buckets, -num_buckets);
4965 ocfs2_xattr_bucket_journal_dirty(handle, old_first);
4966
4967 bucket_xh(new_first)->xh_num_buckets = cpu_to_le16(num_buckets);
4968 ocfs2_xattr_bucket_journal_dirty(handle, new_first);
4969
4970 if (first_hash)
4971 *first_hash = le32_to_cpu(bucket_xh(new_first)->xh_entries[0].xe_name_hash);
4972
4973 out:
4974 ocfs2_xattr_bucket_free(new_first);
4975 ocfs2_xattr_bucket_free(old_first);
4976 return ret;
4977 }
4978
4979 /*
4980 * Move some xattrs in this cluster to the new cluster.
4981 * This function should only be called when bucket size == cluster size.
4982 * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
4983 */
4984 static int ocfs2_divide_xattr_cluster(struct inode *inode,
4985 handle_t *handle,
4986 u64 prev_blk,
4987 u64 new_blk,
4988 u32 *first_hash)
4989 {
4990 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4991 int ret, credits = 2 * blk_per_bucket;
4992
4993 BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
4994
4995 ret = ocfs2_extend_trans(handle, credits);
4996 if (ret) {
4997 mlog_errno(ret);
4998 return ret;
4999 }
5000
5001 /* Move half of the xattr in start_blk to the next bucket. */
5002 return ocfs2_divide_xattr_bucket(inode, handle, prev_blk,
5003 new_blk, first_hash, 1);
5004 }
5005
5006 /*
5007 * Move some xattrs from the old cluster to the new one since they are not
5008 * contiguous in ocfs2 xattr tree.
5009 *
5010 * new_blk starts a new separate cluster, and we will move some xattrs from
5011 * prev_blk to it. v_start will be set as the first name hash value in this
5012 * new cluster so that it can be used as e_cpos during tree insertion and
5013 * don't collide with our original b-tree operations. first_bh and header_bh
5014 * will also be updated since they will be used in ocfs2_extend_xattr_bucket
5015 * to extend the insert bucket.
5016 *
5017 * The problem is how much xattr should we move to the new one and when should
5018 * we update first_bh and header_bh?
5019 * 1. If cluster size > bucket size, that means the previous cluster has more
5020 * than 1 bucket, so just move half nums of bucket into the new cluster and
5021 * update the first_bh and header_bh if the insert bucket has been moved
5022 * to the new cluster.
5023 * 2. If cluster_size == bucket_size:
5024 * a) If the previous extent rec has more than one cluster and the insert
5025 * place isn't in the last cluster, copy the entire last cluster to the
5026 * new one. This time, we don't need to upate the first_bh and header_bh
5027 * since they will not be moved into the new cluster.
5028 * b) Otherwise, move the bottom half of the xattrs in the last cluster into
5029 * the new one. And we set the extend flag to zero if the insert place is
5030 * moved into the new allocated cluster since no extend is needed.
5031 */
5032 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
5033 handle_t *handle,
5034 struct ocfs2_xattr_bucket *first,
5035 struct ocfs2_xattr_bucket *target,
5036 u64 new_blk,
5037 u32 prev_clusters,
5038 u32 *v_start,
5039 int *extend)
5040 {
5041 int ret;
5042
5043 trace_ocfs2_adjust_xattr_cross_cluster(
5044 (unsigned long long)bucket_blkno(first),
5045 (unsigned long long)new_blk, prev_clusters);
5046
5047 if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1) {
5048 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
5049 handle,
5050 first, target,
5051 new_blk,
5052 prev_clusters,
5053 v_start);
5054 if (ret)
5055 mlog_errno(ret);
5056 } else {
5057 /* The start of the last cluster in the first extent */
5058 u64 last_blk = bucket_blkno(first) +
5059 ((prev_clusters - 1) *
5060 ocfs2_clusters_to_blocks(inode->i_sb, 1));
5061
5062 if (prev_clusters > 1 && bucket_blkno(target) != last_blk) {
5063 ret = ocfs2_mv_xattr_buckets(inode, handle,
5064 bucket_blkno(first),
5065 last_blk, new_blk, 0,
5066 v_start);
5067 if (ret)
5068 mlog_errno(ret);
5069 } else {
5070 ret = ocfs2_divide_xattr_cluster(inode, handle,
5071 last_blk, new_blk,
5072 v_start);
5073 if (ret)
5074 mlog_errno(ret);
5075
5076 if ((bucket_blkno(target) == last_blk) && extend)
5077 *extend = 0;
5078 }
5079 }
5080
5081 return ret;
5082 }
5083
5084 /*
5085 * Add a new cluster for xattr storage.
5086 *
5087 * If the new cluster is contiguous with the previous one, it will be
5088 * appended to the same extent record, and num_clusters will be updated.
5089 * If not, we will insert a new extent for it and move some xattrs in
5090 * the last cluster into the new allocated one.
5091 * We also need to limit the maximum size of a btree leaf, otherwise we'll
5092 * lose the benefits of hashing because we'll have to search large leaves.
5093 * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
5094 * if it's bigger).
5095 *
5096 * first_bh is the first block of the previous extent rec and header_bh
5097 * indicates the bucket we will insert the new xattrs. They will be updated
5098 * when the header_bh is moved into the new cluster.
5099 */
5100 static int ocfs2_add_new_xattr_cluster(struct inode *inode,
5101 struct buffer_head *root_bh,
5102 struct ocfs2_xattr_bucket *first,
5103 struct ocfs2_xattr_bucket *target,
5104 u32 *num_clusters,
5105 u32 prev_cpos,
5106 int *extend,
5107 struct ocfs2_xattr_set_ctxt *ctxt)
5108 {
5109 int ret;
5110 u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
5111 u32 prev_clusters = *num_clusters;
5112 u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
5113 u64 block;
5114 handle_t *handle = ctxt->handle;
5115 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5116 struct ocfs2_extent_tree et;
5117
5118 trace_ocfs2_add_new_xattr_cluster_begin(
5119 (unsigned long long)OCFS2_I(inode)->ip_blkno,
5120 (unsigned long long)bucket_blkno(first),
5121 prev_cpos, prev_clusters);
5122
5123 ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
5124
5125 ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
5126 OCFS2_JOURNAL_ACCESS_WRITE);
5127 if (ret < 0) {
5128 mlog_errno(ret);
5129 goto leave;
5130 }
5131
5132 ret = __ocfs2_claim_clusters(handle, ctxt->data_ac, 1,
5133 clusters_to_add, &bit_off, &num_bits);
5134 if (ret < 0) {
5135 if (ret != -ENOSPC)
5136 mlog_errno(ret);
5137 goto leave;
5138 }
5139
5140 BUG_ON(num_bits > clusters_to_add);
5141
5142 block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
5143 trace_ocfs2_add_new_xattr_cluster((unsigned long long)block, num_bits);
5144
5145 if (bucket_blkno(first) + (prev_clusters * bpc) == block &&
5146 (prev_clusters + num_bits) << osb->s_clustersize_bits <=
5147 OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
5148 /*
5149 * If this cluster is contiguous with the old one and
5150 * adding this new cluster, we don't surpass the limit of
5151 * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
5152 * initialized and used like other buckets in the previous
5153 * cluster.
5154 * So add it as a contiguous one. The caller will handle
5155 * its init process.
5156 */
5157 v_start = prev_cpos + prev_clusters;
5158 *num_clusters = prev_clusters + num_bits;
5159 } else {
5160 ret = ocfs2_adjust_xattr_cross_cluster(inode,
5161 handle,
5162 first,
5163 target,
5164 block,
5165 prev_clusters,
5166 &v_start,
5167 extend);
5168 if (ret) {
5169 mlog_errno(ret);
5170 goto leave;
5171 }
5172 }
5173
5174 trace_ocfs2_add_new_xattr_cluster_insert((unsigned long long)block,
5175 v_start, num_bits);
5176 ret = ocfs2_insert_extent(handle, &et, v_start, block,
5177 num_bits, 0, ctxt->meta_ac);
5178 if (ret < 0) {
5179 mlog_errno(ret);
5180 goto leave;
5181 }
5182
5183 ocfs2_journal_dirty(handle, root_bh);
5184
5185 leave:
5186 return ret;
5187 }
5188
5189 /*
5190 * We are given an extent. 'first' is the bucket at the very front of
5191 * the extent. The extent has space for an additional bucket past
5192 * bucket_xh(first)->xh_num_buckets. 'target_blkno' is the block number
5193 * of the target bucket. We wish to shift every bucket past the target
5194 * down one, filling in that additional space. When we get back to the
5195 * target, we split the target between itself and the now-empty bucket
5196 * at target+1 (aka, target_blkno + blks_per_bucket).
5197 */
5198 static int ocfs2_extend_xattr_bucket(struct inode *inode,
5199 handle_t *handle,
5200 struct ocfs2_xattr_bucket *first,
5201 u64 target_blk,
5202 u32 num_clusters)
5203 {
5204 int ret, credits;
5205 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5206 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5207 u64 end_blk;
5208 u16 new_bucket = le16_to_cpu(bucket_xh(first)->xh_num_buckets);
5209
5210 trace_ocfs2_extend_xattr_bucket((unsigned long long)target_blk,
5211 (unsigned long long)bucket_blkno(first),
5212 num_clusters, new_bucket);
5213
5214 /* The extent must have room for an additional bucket */
5215 BUG_ON(new_bucket >=
5216 (num_clusters * ocfs2_xattr_buckets_per_cluster(osb)));
5217
5218 /* end_blk points to the last existing bucket */
5219 end_blk = bucket_blkno(first) + ((new_bucket - 1) * blk_per_bucket);
5220
5221 /*
5222 * end_blk is the start of the last existing bucket.
5223 * Thus, (end_blk - target_blk) covers the target bucket and
5224 * every bucket after it up to, but not including, the last
5225 * existing bucket. Then we add the last existing bucket, the
5226 * new bucket, and the first bucket (3 * blk_per_bucket).
5227 */
5228 credits = (end_blk - target_blk) + (3 * blk_per_bucket);
5229 ret = ocfs2_extend_trans(handle, credits);
5230 if (ret) {
5231 mlog_errno(ret);
5232 goto out;
5233 }
5234
5235 ret = ocfs2_xattr_bucket_journal_access(handle, first,
5236 OCFS2_JOURNAL_ACCESS_WRITE);
5237 if (ret) {
5238 mlog_errno(ret);
5239 goto out;
5240 }
5241
5242 while (end_blk != target_blk) {
5243 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
5244 end_blk + blk_per_bucket, 0);
5245 if (ret)
5246 goto out;
5247 end_blk -= blk_per_bucket;
5248 }
5249
5250 /* Move half of the xattr in target_blkno to the next bucket. */
5251 ret = ocfs2_divide_xattr_bucket(inode, handle, target_blk,
5252 target_blk + blk_per_bucket, NULL, 0);
5253
5254 le16_add_cpu(&bucket_xh(first)->xh_num_buckets, 1);
5255 ocfs2_xattr_bucket_journal_dirty(handle, first);
5256
5257 out:
5258 return ret;
5259 }
5260
5261 /*
5262 * Add new xattr bucket in an extent record and adjust the buckets
5263 * accordingly. xb_bh is the ocfs2_xattr_block, and target is the
5264 * bucket we want to insert into.
5265 *
5266 * In the easy case, we will move all the buckets after target down by
5267 * one. Half of target's xattrs will be moved to the next bucket.
5268 *
5269 * If current cluster is full, we'll allocate a new one. This may not
5270 * be contiguous. The underlying calls will make sure that there is
5271 * space for the insert, shifting buckets around if necessary.
5272 * 'target' may be moved by those calls.
5273 */
5274 static int ocfs2_add_new_xattr_bucket(struct inode *inode,
5275 struct buffer_head *xb_bh,
5276 struct ocfs2_xattr_bucket *target,
5277 struct ocfs2_xattr_set_ctxt *ctxt)
5278 {
5279 struct ocfs2_xattr_block *xb =
5280 (struct ocfs2_xattr_block *)xb_bh->b_data;
5281 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
5282 struct ocfs2_extent_list *el = &xb_root->xt_list;
5283 u32 name_hash =
5284 le32_to_cpu(bucket_xh(target)->xh_entries[0].xe_name_hash);
5285 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5286 int ret, num_buckets, extend = 1;
5287 u64 p_blkno;
5288 u32 e_cpos, num_clusters;
5289 /* The bucket at the front of the extent */
5290 struct ocfs2_xattr_bucket *first;
5291
5292 trace_ocfs2_add_new_xattr_bucket(
5293 (unsigned long long)bucket_blkno(target));
5294
5295 /* The first bucket of the original extent */
5296 first = ocfs2_xattr_bucket_new(inode);
5297 if (!first) {
5298 ret = -ENOMEM;
5299 mlog_errno(ret);
5300 goto out;
5301 }
5302
5303 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
5304 &num_clusters, el);
5305 if (ret) {
5306 mlog_errno(ret);
5307 goto out;
5308 }
5309
5310 ret = ocfs2_read_xattr_bucket(first, p_blkno);
5311 if (ret) {
5312 mlog_errno(ret);
5313 goto out;
5314 }
5315
5316 num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
5317 if (num_buckets == le16_to_cpu(bucket_xh(first)->xh_num_buckets)) {
5318 /*
5319 * This can move first+target if the target bucket moves
5320 * to the new extent.
5321 */
5322 ret = ocfs2_add_new_xattr_cluster(inode,
5323 xb_bh,
5324 first,
5325 target,
5326 &num_clusters,
5327 e_cpos,
5328 &extend,
5329 ctxt);
5330 if (ret) {
5331 mlog_errno(ret);
5332 goto out;
5333 }
5334 }
5335
5336 if (extend) {
5337 ret = ocfs2_extend_xattr_bucket(inode,
5338 ctxt->handle,
5339 first,
5340 bucket_blkno(target),
5341 num_clusters);
5342 if (ret)
5343 mlog_errno(ret);
5344 }
5345
5346 out:
5347 ocfs2_xattr_bucket_free(first);
5348
5349 return ret;
5350 }
5351
5352 /*
5353 * Truncate the specified xe_off entry in xattr bucket.
5354 * bucket is indicated by header_bh and len is the new length.
5355 * Both the ocfs2_xattr_value_root and the entry will be updated here.
5356 *
5357 * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
5358 */
5359 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
5360 struct ocfs2_xattr_bucket *bucket,
5361 int xe_off,
5362 int len,
5363 struct ocfs2_xattr_set_ctxt *ctxt)
5364 {
5365 int ret, offset;
5366 u64 value_blk;
5367 struct ocfs2_xattr_entry *xe;
5368 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5369 size_t blocksize = inode->i_sb->s_blocksize;
5370 struct ocfs2_xattr_value_buf vb = {
5371 .vb_access = ocfs2_journal_access,
5372 };
5373
5374 xe = &xh->xh_entries[xe_off];
5375
5376 BUG_ON(!xe || ocfs2_xattr_is_local(xe));
5377
5378 offset = le16_to_cpu(xe->xe_name_offset) +
5379 OCFS2_XATTR_SIZE(xe->xe_name_len);
5380
5381 value_blk = offset / blocksize;
5382
5383 /* We don't allow ocfs2_xattr_value to be stored in different block. */
5384 BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
5385
5386 vb.vb_bh = bucket->bu_bhs[value_blk];
5387 BUG_ON(!vb.vb_bh);
5388
5389 vb.vb_xv = (struct ocfs2_xattr_value_root *)
5390 (vb.vb_bh->b_data + offset % blocksize);
5391
5392 /*
5393 * From here on out we have to dirty the bucket. The generic
5394 * value calls only modify one of the bucket's bhs, but we need
5395 * to send the bucket at once. So if they error, they *could* have
5396 * modified something. We have to assume they did, and dirty
5397 * the whole bucket. This leaves us in a consistent state.
5398 */
5399 trace_ocfs2_xattr_bucket_value_truncate(
5400 (unsigned long long)bucket_blkno(bucket), xe_off, len);
5401 ret = ocfs2_xattr_value_truncate(inode, &vb, len, ctxt);
5402 if (ret) {
5403 mlog_errno(ret);
5404 goto out;
5405 }
5406
5407 ret = ocfs2_xattr_bucket_journal_access(ctxt->handle, bucket,
5408 OCFS2_JOURNAL_ACCESS_WRITE);
5409 if (ret) {
5410 mlog_errno(ret);
5411 goto out;
5412 }
5413
5414 xe->xe_value_size = cpu_to_le64(len);
5415
5416 ocfs2_xattr_bucket_journal_dirty(ctxt->handle, bucket);
5417
5418 out:
5419 return ret;
5420 }
5421
5422 static int ocfs2_rm_xattr_cluster(struct inode *inode,
5423 struct buffer_head *root_bh,
5424 u64 blkno,
5425 u32 cpos,
5426 u32 len,
5427 void *para)
5428 {
5429 int ret;
5430 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5431 struct inode *tl_inode = osb->osb_tl_inode;
5432 handle_t *handle;
5433 struct ocfs2_xattr_block *xb =
5434 (struct ocfs2_xattr_block *)root_bh->b_data;
5435 struct ocfs2_alloc_context *meta_ac = NULL;
5436 struct ocfs2_cached_dealloc_ctxt dealloc;
5437 struct ocfs2_extent_tree et;
5438
5439 ret = ocfs2_iterate_xattr_buckets(inode, blkno, len,
5440 ocfs2_delete_xattr_in_bucket, para);
5441 if (ret) {
5442 mlog_errno(ret);
5443 return ret;
5444 }
5445
5446 ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
5447
5448 ocfs2_init_dealloc_ctxt(&dealloc);
5449
5450 trace_ocfs2_rm_xattr_cluster(
5451 (unsigned long long)OCFS2_I(inode)->ip_blkno,
5452 (unsigned long long)blkno, cpos, len);
5453
5454 ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode), blkno,
5455 len);
5456
5457 ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
5458 if (ret) {
5459 mlog_errno(ret);
5460 return ret;
5461 }
5462
5463 inode_lock(tl_inode);
5464
5465 if (ocfs2_truncate_log_needs_flush(osb)) {
5466 ret = __ocfs2_flush_truncate_log(osb);
5467 if (ret < 0) {
5468 mlog_errno(ret);
5469 goto out;
5470 }
5471 }
5472
5473 handle = ocfs2_start_trans(osb, ocfs2_remove_extent_credits(osb->sb));
5474 if (IS_ERR(handle)) {
5475 ret = -ENOMEM;
5476 mlog_errno(ret);
5477 goto out;
5478 }
5479
5480 ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
5481 OCFS2_JOURNAL_ACCESS_WRITE);
5482 if (ret) {
5483 mlog_errno(ret);
5484 goto out_commit;
5485 }
5486
5487 ret = ocfs2_remove_extent(handle, &et, cpos, len, meta_ac,
5488 &dealloc);
5489 if (ret) {
5490 mlog_errno(ret);
5491 goto out_commit;
5492 }
5493
5494 le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
5495 ocfs2_journal_dirty(handle, root_bh);
5496
5497 ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
5498 if (ret)
5499 mlog_errno(ret);
5500 ocfs2_update_inode_fsync_trans(handle, inode, 0);
5501
5502 out_commit:
5503 ocfs2_commit_trans(osb, handle);
5504 out:
5505 ocfs2_schedule_truncate_log_flush(osb, 1);
5506
5507 inode_unlock(tl_inode);
5508
5509 if (meta_ac)
5510 ocfs2_free_alloc_context(meta_ac);
5511
5512 ocfs2_run_deallocs(osb, &dealloc);
5513
5514 return ret;
5515 }
5516
5517 /*
5518 * check whether the xattr bucket is filled up with the same hash value.
5519 * If we want to insert the xattr with the same hash, return -ENOSPC.
5520 * If we want to insert a xattr with different hash value, go ahead
5521 * and ocfs2_divide_xattr_bucket will handle this.
5522 */
5523 static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
5524 struct ocfs2_xattr_bucket *bucket,
5525 const char *name)
5526 {
5527 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5528 u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
5529
5530 if (name_hash != le32_to_cpu(xh->xh_entries[0].xe_name_hash))
5531 return 0;
5532
5533 if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
5534 xh->xh_entries[0].xe_name_hash) {
5535 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
5536 "hash = %u\n",
5537 (unsigned long long)bucket_blkno(bucket),
5538 le32_to_cpu(xh->xh_entries[0].xe_name_hash));
5539 return -ENOSPC;
5540 }
5541
5542 return 0;
5543 }
5544
5545 /*
5546 * Try to set the entry in the current bucket. If we fail, the caller
5547 * will handle getting us another bucket.
5548 */
5549 static int ocfs2_xattr_set_entry_bucket(struct inode *inode,
5550 struct ocfs2_xattr_info *xi,
5551 struct ocfs2_xattr_search *xs,
5552 struct ocfs2_xattr_set_ctxt *ctxt)
5553 {
5554 int ret;
5555 struct ocfs2_xa_loc loc;
5556
5557 trace_ocfs2_xattr_set_entry_bucket(xi->xi_name);
5558
5559 ocfs2_init_xattr_bucket_xa_loc(&loc, xs->bucket,
5560 xs->not_found ? NULL : xs->here);
5561 ret = ocfs2_xa_set(&loc, xi, ctxt);
5562 if (!ret) {
5563 xs->here = loc.xl_entry;
5564 goto out;
5565 }
5566 if (ret != -ENOSPC) {
5567 mlog_errno(ret);
5568 goto out;
5569 }
5570
5571 /* Ok, we need space. Let's try defragmenting the bucket. */
5572 ret = ocfs2_defrag_xattr_bucket(inode, ctxt->handle,
5573 xs->bucket);
5574 if (ret) {
5575 mlog_errno(ret);
5576 goto out;
5577 }
5578
5579 ret = ocfs2_xa_set(&loc, xi, ctxt);
5580 if (!ret) {
5581 xs->here = loc.xl_entry;
5582 goto out;
5583 }
5584 if (ret != -ENOSPC)
5585 mlog_errno(ret);
5586
5587
5588 out:
5589 return ret;
5590 }
5591
5592 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
5593 struct ocfs2_xattr_info *xi,
5594 struct ocfs2_xattr_search *xs,
5595 struct ocfs2_xattr_set_ctxt *ctxt)
5596 {
5597 int ret;
5598
5599 trace_ocfs2_xattr_set_entry_index_block(xi->xi_name);
5600
5601 ret = ocfs2_xattr_set_entry_bucket(inode, xi, xs, ctxt);
5602 if (!ret)
5603 goto out;
5604 if (ret != -ENOSPC) {
5605 mlog_errno(ret);
5606 goto out;
5607 }
5608
5609 /* Ack, need more space. Let's try to get another bucket! */
5610
5611 /*
5612 * We do not allow for overlapping ranges between buckets. And
5613 * the maximum number of collisions we will allow for then is
5614 * one bucket's worth, so check it here whether we need to
5615 * add a new bucket for the insert.
5616 */
5617 ret = ocfs2_check_xattr_bucket_collision(inode,
5618 xs->bucket,
5619 xi->xi_name);
5620 if (ret) {
5621 mlog_errno(ret);
5622 goto out;
5623 }
5624
5625 ret = ocfs2_add_new_xattr_bucket(inode,
5626 xs->xattr_bh,
5627 xs->bucket,
5628 ctxt);
5629 if (ret) {
5630 mlog_errno(ret);
5631 goto out;
5632 }
5633
5634 /*
5635 * ocfs2_add_new_xattr_bucket() will have updated
5636 * xs->bucket if it moved, but it will not have updated
5637 * any of the other search fields. Thus, we drop it and
5638 * re-search. Everything should be cached, so it'll be
5639 * quick.
5640 */
5641 ocfs2_xattr_bucket_relse(xs->bucket);
5642 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
5643 xi->xi_name_index,
5644 xi->xi_name, xs);
5645 if (ret && ret != -ENODATA)
5646 goto out;
5647 xs->not_found = ret;
5648
5649 /* Ok, we have a new bucket, let's try again */
5650 ret = ocfs2_xattr_set_entry_bucket(inode, xi, xs, ctxt);
5651 if (ret && (ret != -ENOSPC))
5652 mlog_errno(ret);
5653
5654 out:
5655 return ret;
5656 }
5657
5658 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
5659 struct ocfs2_xattr_bucket *bucket,
5660 void *para)
5661 {
5662 int ret = 0, ref_credits;
5663 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5664 u16 i;
5665 struct ocfs2_xattr_entry *xe;
5666 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5667 struct ocfs2_xattr_set_ctxt ctxt = {NULL, NULL,};
5668 int credits = ocfs2_remove_extent_credits(osb->sb) +
5669 ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5670 struct ocfs2_xattr_value_root *xv;
5671 struct ocfs2_rm_xattr_bucket_para *args =
5672 (struct ocfs2_rm_xattr_bucket_para *)para;
5673
5674 ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
5675
5676 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
5677 xe = &xh->xh_entries[i];
5678 if (ocfs2_xattr_is_local(xe))
5679 continue;
5680
5681 ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket,
5682 i, &xv, NULL);
5683 if (ret) {
5684 mlog_errno(ret);
5685 break;
5686 }
5687
5688 ret = ocfs2_lock_xattr_remove_allocators(inode, xv,
5689 args->ref_ci,
5690 args->ref_root_bh,
5691 &ctxt.meta_ac,
5692 &ref_credits);
5693
5694 ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
5695 if (IS_ERR(ctxt.handle)) {
5696 ret = PTR_ERR(ctxt.handle);
5697 mlog_errno(ret);
5698 break;
5699 }
5700
5701 ret = ocfs2_xattr_bucket_value_truncate(inode, bucket,
5702 i, 0, &ctxt);
5703
5704 ocfs2_commit_trans(osb, ctxt.handle);
5705 if (ctxt.meta_ac) {
5706 ocfs2_free_alloc_context(ctxt.meta_ac);
5707 ctxt.meta_ac = NULL;
5708 }
5709 if (ret) {
5710 mlog_errno(ret);
5711 break;
5712 }
5713 }
5714
5715 if (ctxt.meta_ac)
5716 ocfs2_free_alloc_context(ctxt.meta_ac);
5717 ocfs2_schedule_truncate_log_flush(osb, 1);
5718 ocfs2_run_deallocs(osb, &ctxt.dealloc);
5719 return ret;
5720 }
5721
5722 /*
5723 * Whenever we modify a xattr value root in the bucket(e.g, CoW
5724 * or change the extent record flag), we need to recalculate
5725 * the metaecc for the whole bucket. So it is done here.
5726 *
5727 * Note:
5728 * We have to give the extra credits for the caller.
5729 */
5730 static int ocfs2_xattr_bucket_post_refcount(struct inode *inode,
5731 handle_t *handle,
5732 void *para)
5733 {
5734 int ret;
5735 struct ocfs2_xattr_bucket *bucket =
5736 (struct ocfs2_xattr_bucket *)para;
5737
5738 ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
5739 OCFS2_JOURNAL_ACCESS_WRITE);
5740 if (ret) {
5741 mlog_errno(ret);
5742 return ret;
5743 }
5744
5745 ocfs2_xattr_bucket_journal_dirty(handle, bucket);
5746
5747 return 0;
5748 }
5749
5750 /*
5751 * Special action we need if the xattr value is refcounted.
5752 *
5753 * 1. If the xattr is refcounted, lock the tree.
5754 * 2. CoW the xattr if we are setting the new value and the value
5755 * will be stored outside.
5756 * 3. In other case, decrease_refcount will work for us, so just
5757 * lock the refcount tree, calculate the meta and credits is OK.
5758 *
5759 * We have to do CoW before ocfs2_init_xattr_set_ctxt since
5760 * currently CoW is a completed transaction, while this function
5761 * will also lock the allocators and let us deadlock. So we will
5762 * CoW the whole xattr value.
5763 */
5764 static int ocfs2_prepare_refcount_xattr(struct inode *inode,
5765 struct ocfs2_dinode *di,
5766 struct ocfs2_xattr_info *xi,
5767 struct ocfs2_xattr_search *xis,
5768 struct ocfs2_xattr_search *xbs,
5769 struct ocfs2_refcount_tree **ref_tree,
5770 int *meta_add,
5771 int *credits)
5772 {
5773 int ret = 0;
5774 struct ocfs2_xattr_block *xb;
5775 struct ocfs2_xattr_entry *xe;
5776 char *base;
5777 u32 p_cluster, num_clusters;
5778 unsigned int ext_flags;
5779 int name_offset, name_len;
5780 struct ocfs2_xattr_value_buf vb;
5781 struct ocfs2_xattr_bucket *bucket = NULL;
5782 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5783 struct ocfs2_post_refcount refcount;
5784 struct ocfs2_post_refcount *p = NULL;
5785 struct buffer_head *ref_root_bh = NULL;
5786
5787 if (!xis->not_found) {
5788 xe = xis->here;
5789 name_offset = le16_to_cpu(xe->xe_name_offset);
5790 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5791 base = xis->base;
5792 vb.vb_bh = xis->inode_bh;
5793 vb.vb_access = ocfs2_journal_access_di;
5794 } else {
5795 int i, block_off = 0;
5796 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
5797 xe = xbs->here;
5798 name_offset = le16_to_cpu(xe->xe_name_offset);
5799 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5800 i = xbs->here - xbs->header->xh_entries;
5801
5802 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
5803 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
5804 bucket_xh(xbs->bucket),
5805 i, &block_off,
5806 &name_offset);
5807 if (ret) {
5808 mlog_errno(ret);
5809 goto out;
5810 }
5811 base = bucket_block(xbs->bucket, block_off);
5812 vb.vb_bh = xbs->bucket->bu_bhs[block_off];
5813 vb.vb_access = ocfs2_journal_access;
5814
5815 if (ocfs2_meta_ecc(osb)) {
5816 /*create parameters for ocfs2_post_refcount. */
5817 bucket = xbs->bucket;
5818 refcount.credits = bucket->bu_blocks;
5819 refcount.para = bucket;
5820 refcount.func =
5821 ocfs2_xattr_bucket_post_refcount;
5822 p = &refcount;
5823 }
5824 } else {
5825 base = xbs->base;
5826 vb.vb_bh = xbs->xattr_bh;
5827 vb.vb_access = ocfs2_journal_access_xb;
5828 }
5829 }
5830
5831 if (ocfs2_xattr_is_local(xe))
5832 goto out;
5833
5834 vb.vb_xv = (struct ocfs2_xattr_value_root *)
5835 (base + name_offset + name_len);
5836
5837 ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
5838 &num_clusters, &vb.vb_xv->xr_list,
5839 &ext_flags);
5840 if (ret) {
5841 mlog_errno(ret);
5842 goto out;
5843 }
5844
5845 /*
5846 * We just need to check the 1st extent record, since we always
5847 * CoW the whole xattr. So there shouldn't be a xattr with
5848 * some REFCOUNT extent recs after the 1st one.
5849 */
5850 if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
5851 goto out;
5852
5853 ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
5854 1, ref_tree, &ref_root_bh);
5855 if (ret) {
5856 mlog_errno(ret);
5857 goto out;
5858 }
5859
5860 /*
5861 * If we are deleting the xattr or the new size will be stored inside,
5862 * cool, leave it there, the xattr truncate process will remove them
5863 * for us(it still needs the refcount tree lock and the meta, credits).
5864 * And the worse case is that every cluster truncate will split the
5865 * refcount tree, and make the original extent become 3. So we will need
5866 * 2 * cluster more extent recs at most.
5867 */
5868 if (!xi->xi_value || xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE) {
5869
5870 ret = ocfs2_refcounted_xattr_delete_need(inode,
5871 &(*ref_tree)->rf_ci,
5872 ref_root_bh, vb.vb_xv,
5873 meta_add, credits);
5874 if (ret)
5875 mlog_errno(ret);
5876 goto out;
5877 }
5878
5879 ret = ocfs2_refcount_cow_xattr(inode, di, &vb,
5880 *ref_tree, ref_root_bh, 0,
5881 le32_to_cpu(vb.vb_xv->xr_clusters), p);
5882 if (ret)
5883 mlog_errno(ret);
5884
5885 out:
5886 brelse(ref_root_bh);
5887 return ret;
5888 }
5889
5890 /*
5891 * Add the REFCOUNTED flags for all the extent rec in ocfs2_xattr_value_root.
5892 * The physical clusters will be added to refcount tree.
5893 */
5894 static int ocfs2_xattr_value_attach_refcount(struct inode *inode,
5895 struct ocfs2_xattr_value_root *xv,
5896 struct ocfs2_extent_tree *value_et,
5897 struct ocfs2_caching_info *ref_ci,
5898 struct buffer_head *ref_root_bh,
5899 struct ocfs2_cached_dealloc_ctxt *dealloc,
5900 struct ocfs2_post_refcount *refcount)
5901 {
5902 int ret = 0;
5903 u32 clusters = le32_to_cpu(xv->xr_clusters);
5904 u32 cpos, p_cluster, num_clusters;
5905 struct ocfs2_extent_list *el = &xv->xr_list;
5906 unsigned int ext_flags;
5907
5908 cpos = 0;
5909 while (cpos < clusters) {
5910 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
5911 &num_clusters, el, &ext_flags);
5912 if (ret) {
5913 mlog_errno(ret);
5914 break;
5915 }
5916
5917 cpos += num_clusters;
5918 if ((ext_flags & OCFS2_EXT_REFCOUNTED))
5919 continue;
5920
5921 BUG_ON(!p_cluster);
5922
5923 ret = ocfs2_add_refcount_flag(inode, value_et,
5924 ref_ci, ref_root_bh,
5925 cpos - num_clusters,
5926 p_cluster, num_clusters,
5927 dealloc, refcount);
5928 if (ret) {
5929 mlog_errno(ret);
5930 break;
5931 }
5932 }
5933
5934 return ret;
5935 }
5936
5937 /*
5938 * Given a normal ocfs2_xattr_header, refcount all the entries which
5939 * have value stored outside.
5940 * Used for xattrs stored in inode and ocfs2_xattr_block.
5941 */
5942 static int ocfs2_xattr_attach_refcount_normal(struct inode *inode,
5943 struct ocfs2_xattr_value_buf *vb,
5944 struct ocfs2_xattr_header *header,
5945 struct ocfs2_caching_info *ref_ci,
5946 struct buffer_head *ref_root_bh,
5947 struct ocfs2_cached_dealloc_ctxt *dealloc)
5948 {
5949
5950 struct ocfs2_xattr_entry *xe;
5951 struct ocfs2_xattr_value_root *xv;
5952 struct ocfs2_extent_tree et;
5953 int i, ret = 0;
5954
5955 for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
5956 xe = &header->xh_entries[i];
5957
5958 if (ocfs2_xattr_is_local(xe))
5959 continue;
5960
5961 xv = (struct ocfs2_xattr_value_root *)((void *)header +
5962 le16_to_cpu(xe->xe_name_offset) +
5963 OCFS2_XATTR_SIZE(xe->xe_name_len));
5964
5965 vb->vb_xv = xv;
5966 ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
5967
5968 ret = ocfs2_xattr_value_attach_refcount(inode, xv, &et,
5969 ref_ci, ref_root_bh,
5970 dealloc, NULL);
5971 if (ret) {
5972 mlog_errno(ret);
5973 break;
5974 }
5975 }
5976
5977 return ret;
5978 }
5979
5980 static int ocfs2_xattr_inline_attach_refcount(struct inode *inode,
5981 struct buffer_head *fe_bh,
5982 struct ocfs2_caching_info *ref_ci,
5983 struct buffer_head *ref_root_bh,
5984 struct ocfs2_cached_dealloc_ctxt *dealloc)
5985 {
5986 struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
5987 struct ocfs2_xattr_header *header = (struct ocfs2_xattr_header *)
5988 (fe_bh->b_data + inode->i_sb->s_blocksize -
5989 le16_to_cpu(di->i_xattr_inline_size));
5990 struct ocfs2_xattr_value_buf vb = {
5991 .vb_bh = fe_bh,
5992 .vb_access = ocfs2_journal_access_di,
5993 };
5994
5995 return ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
5996 ref_ci, ref_root_bh, dealloc);
5997 }
5998
5999 struct ocfs2_xattr_tree_value_refcount_para {
6000 struct ocfs2_caching_info *ref_ci;
6001 struct buffer_head *ref_root_bh;
6002 struct ocfs2_cached_dealloc_ctxt *dealloc;
6003 };
6004
6005 static int ocfs2_get_xattr_tree_value_root(struct super_block *sb,
6006 struct ocfs2_xattr_bucket *bucket,
6007 int offset,
6008 struct ocfs2_xattr_value_root **xv,
6009 struct buffer_head **bh)
6010 {
6011 int ret, block_off, name_offset;
6012 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
6013 struct ocfs2_xattr_entry *xe = &xh->xh_entries[offset];
6014 void *base;
6015
6016 ret = ocfs2_xattr_bucket_get_name_value(sb,
6017 bucket_xh(bucket),
6018 offset,
6019 &block_off,
6020 &name_offset);
6021 if (ret) {
6022 mlog_errno(ret);
6023 goto out;
6024 }
6025
6026 base = bucket_block(bucket, block_off);
6027
6028 *xv = (struct ocfs2_xattr_value_root *)(base + name_offset +
6029 OCFS2_XATTR_SIZE(xe->xe_name_len));
6030
6031 if (bh)
6032 *bh = bucket->bu_bhs[block_off];
6033 out:
6034 return ret;
6035 }
6036
6037 /*
6038 * For a given xattr bucket, refcount all the entries which
6039 * have value stored outside.
6040 */
6041 static int ocfs2_xattr_bucket_value_refcount(struct inode *inode,
6042 struct ocfs2_xattr_bucket *bucket,
6043 void *para)
6044 {
6045 int i, ret = 0;
6046 struct ocfs2_extent_tree et;
6047 struct ocfs2_xattr_tree_value_refcount_para *ref =
6048 (struct ocfs2_xattr_tree_value_refcount_para *)para;
6049 struct ocfs2_xattr_header *xh =
6050 (struct ocfs2_xattr_header *)bucket->bu_bhs[0]->b_data;
6051 struct ocfs2_xattr_entry *xe;
6052 struct ocfs2_xattr_value_buf vb = {
6053 .vb_access = ocfs2_journal_access,
6054 };
6055 struct ocfs2_post_refcount refcount = {
6056 .credits = bucket->bu_blocks,
6057 .para = bucket,
6058 .func = ocfs2_xattr_bucket_post_refcount,
6059 };
6060 struct ocfs2_post_refcount *p = NULL;
6061
6062 /* We only need post_refcount if we support metaecc. */
6063 if (ocfs2_meta_ecc(OCFS2_SB(inode->i_sb)))
6064 p = &refcount;
6065
6066 trace_ocfs2_xattr_bucket_value_refcount(
6067 (unsigned long long)bucket_blkno(bucket),
6068 le16_to_cpu(xh->xh_count));
6069 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
6070 xe = &xh->xh_entries[i];
6071
6072 if (ocfs2_xattr_is_local(xe))
6073 continue;
6074
6075 ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket, i,
6076 &vb.vb_xv, &vb.vb_bh);
6077 if (ret) {
6078 mlog_errno(ret);
6079 break;
6080 }
6081
6082 ocfs2_init_xattr_value_extent_tree(&et,
6083 INODE_CACHE(inode), &vb);
6084
6085 ret = ocfs2_xattr_value_attach_refcount(inode, vb.vb_xv,
6086 &et, ref->ref_ci,
6087 ref->ref_root_bh,
6088 ref->dealloc, p);
6089 if (ret) {
6090 mlog_errno(ret);
6091 break;
6092 }
6093 }
6094
6095 return ret;
6096
6097 }
6098
6099 static int ocfs2_refcount_xattr_tree_rec(struct inode *inode,
6100 struct buffer_head *root_bh,
6101 u64 blkno, u32 cpos, u32 len, void *para)
6102 {
6103 return ocfs2_iterate_xattr_buckets(inode, blkno, len,
6104 ocfs2_xattr_bucket_value_refcount,
6105 para);
6106 }
6107
6108 static int ocfs2_xattr_block_attach_refcount(struct inode *inode,
6109 struct buffer_head *blk_bh,
6110 struct ocfs2_caching_info *ref_ci,
6111 struct buffer_head *ref_root_bh,
6112 struct ocfs2_cached_dealloc_ctxt *dealloc)
6113 {
6114 int ret = 0;
6115 struct ocfs2_xattr_block *xb =
6116 (struct ocfs2_xattr_block *)blk_bh->b_data;
6117
6118 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
6119 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
6120 struct ocfs2_xattr_value_buf vb = {
6121 .vb_bh = blk_bh,
6122 .vb_access = ocfs2_journal_access_xb,
6123 };
6124
6125 ret = ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
6126 ref_ci, ref_root_bh,
6127 dealloc);
6128 } else {
6129 struct ocfs2_xattr_tree_value_refcount_para para = {
6130 .ref_ci = ref_ci,
6131 .ref_root_bh = ref_root_bh,
6132 .dealloc = dealloc,
6133 };
6134
6135 ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
6136 ocfs2_refcount_xattr_tree_rec,
6137 &para);
6138 }
6139
6140 return ret;
6141 }
6142
6143 int ocfs2_xattr_attach_refcount_tree(struct inode *inode,
6144 struct buffer_head *fe_bh,
6145 struct ocfs2_caching_info *ref_ci,
6146 struct buffer_head *ref_root_bh,
6147 struct ocfs2_cached_dealloc_ctxt *dealloc)
6148 {
6149 int ret = 0;
6150 struct ocfs2_inode_info *oi = OCFS2_I(inode);
6151 struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
6152 struct buffer_head *blk_bh = NULL;
6153
6154 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
6155 ret = ocfs2_xattr_inline_attach_refcount(inode, fe_bh,
6156 ref_ci, ref_root_bh,
6157 dealloc);
6158 if (ret) {
6159 mlog_errno(ret);
6160 goto out;
6161 }
6162 }
6163
6164 if (!di->i_xattr_loc)
6165 goto out;
6166
6167 ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
6168 &blk_bh);
6169 if (ret < 0) {
6170 mlog_errno(ret);
6171 goto out;
6172 }
6173
6174 ret = ocfs2_xattr_block_attach_refcount(inode, blk_bh, ref_ci,
6175 ref_root_bh, dealloc);
6176 if (ret)
6177 mlog_errno(ret);
6178
6179 brelse(blk_bh);
6180 out:
6181
6182 return ret;
6183 }
6184
6185 typedef int (should_xattr_reflinked)(struct ocfs2_xattr_entry *xe);
6186 /*
6187 * Store the information we need in xattr reflink.
6188 * old_bh and new_bh are inode bh for the old and new inode.
6189 */
6190 struct ocfs2_xattr_reflink {
6191 struct inode *old_inode;
6192 struct inode *new_inode;
6193 struct buffer_head *old_bh;
6194 struct buffer_head *new_bh;
6195 struct ocfs2_caching_info *ref_ci;
6196 struct buffer_head *ref_root_bh;
6197 struct ocfs2_cached_dealloc_ctxt *dealloc;
6198 should_xattr_reflinked *xattr_reflinked;
6199 };
6200
6201 /*
6202 * Given a xattr header and xe offset,
6203 * return the proper xv and the corresponding bh.
6204 * xattr in inode, block and xattr tree have different implementaions.
6205 */
6206 typedef int (get_xattr_value_root)(struct super_block *sb,
6207 struct buffer_head *bh,
6208 struct ocfs2_xattr_header *xh,
6209 int offset,
6210 struct ocfs2_xattr_value_root **xv,
6211 struct buffer_head **ret_bh,
6212 void *para);
6213
6214 /*
6215 * Calculate all the xattr value root metadata stored in this xattr header and
6216 * credits we need if we create them from the scratch.
6217 * We use get_xattr_value_root so that all types of xattr container can use it.
6218 */
6219 static int ocfs2_value_metas_in_xattr_header(struct super_block *sb,
6220 struct buffer_head *bh,
6221 struct ocfs2_xattr_header *xh,
6222 int *metas, int *credits,
6223 int *num_recs,
6224 get_xattr_value_root *func,
6225 void *para)
6226 {
6227 int i, ret = 0;
6228 struct ocfs2_xattr_value_root *xv;
6229 struct ocfs2_xattr_entry *xe;
6230
6231 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
6232 xe = &xh->xh_entries[i];
6233 if (ocfs2_xattr_is_local(xe))
6234 continue;
6235
6236 ret = func(sb, bh, xh, i, &xv, NULL, para);
6237 if (ret) {
6238 mlog_errno(ret);
6239 break;
6240 }
6241
6242 *metas += le16_to_cpu(xv->xr_list.l_tree_depth) *
6243 le16_to_cpu(xv->xr_list.l_next_free_rec);
6244
6245 *credits += ocfs2_calc_extend_credits(sb,
6246 &def_xv.xv.xr_list);
6247
6248 /*
6249 * If the value is a tree with depth > 1, We don't go deep
6250 * to the extent block, so just calculate a maximum record num.
6251 */
6252 if (!xv->xr_list.l_tree_depth)
6253 *num_recs += le16_to_cpu(xv->xr_list.l_next_free_rec);
6254 else
6255 *num_recs += ocfs2_clusters_for_bytes(sb,
6256 XATTR_SIZE_MAX);
6257 }
6258
6259 return ret;
6260 }
6261
6262 /* Used by xattr inode and block to return the right xv and buffer_head. */
6263 static int ocfs2_get_xattr_value_root(struct super_block *sb,
6264 struct buffer_head *bh,
6265 struct ocfs2_xattr_header *xh,
6266 int offset,
6267 struct ocfs2_xattr_value_root **xv,
6268 struct buffer_head **ret_bh,
6269 void *para)
6270 {
6271 struct ocfs2_xattr_entry *xe = &xh->xh_entries[offset];
6272
6273 *xv = (struct ocfs2_xattr_value_root *)((void *)xh +
6274 le16_to_cpu(xe->xe_name_offset) +
6275 OCFS2_XATTR_SIZE(xe->xe_name_len));
6276
6277 if (ret_bh)
6278 *ret_bh = bh;
6279
6280 return 0;
6281 }
6282
6283 /*
6284 * Lock the meta_ac and caculate how much credits we need for reflink xattrs.
6285 * It is only used for inline xattr and xattr block.
6286 */
6287 static int ocfs2_reflink_lock_xattr_allocators(struct ocfs2_super *osb,
6288 struct ocfs2_xattr_header *xh,
6289 struct buffer_head *ref_root_bh,
6290 int *credits,
6291 struct ocfs2_alloc_context **meta_ac)
6292 {
6293 int ret, meta_add = 0, num_recs = 0;
6294 struct ocfs2_refcount_block *rb =
6295 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
6296
6297 *credits = 0;
6298
6299 ret = ocfs2_value_metas_in_xattr_header(osb->sb, NULL, xh,
6300 &meta_add, credits, &num_recs,
6301 ocfs2_get_xattr_value_root,
6302 NULL);
6303 if (ret) {
6304 mlog_errno(ret);
6305 goto out;
6306 }
6307
6308 /*
6309 * We need to add/modify num_recs in refcount tree, so just calculate
6310 * an approximate number we need for refcount tree change.
6311 * Sometimes we need to split the tree, and after split, half recs
6312 * will be moved to the new block, and a new block can only provide
6313 * half number of recs. So we multiple new blocks by 2.
6314 */
6315 num_recs = num_recs / ocfs2_refcount_recs_per_rb(osb->sb) * 2;
6316 meta_add += num_recs;
6317 *credits += num_recs + num_recs * OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
6318 if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
6319 *credits += le16_to_cpu(rb->rf_list.l_tree_depth) *
6320 le16_to_cpu(rb->rf_list.l_next_free_rec) + 1;
6321 else
6322 *credits += 1;
6323
6324 ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add, meta_ac);
6325 if (ret)
6326 mlog_errno(ret);
6327
6328 out:
6329 return ret;
6330 }
6331
6332 /*
6333 * Given a xattr header, reflink all the xattrs in this container.
6334 * It can be used for inode, block and bucket.
6335 *
6336 * NOTE:
6337 * Before we call this function, the caller has memcpy the xattr in
6338 * old_xh to the new_xh.
6339 *
6340 * If args.xattr_reflinked is set, call it to decide whether the xe should
6341 * be reflinked or not. If not, remove it from the new xattr header.
6342 */
6343 static int ocfs2_reflink_xattr_header(handle_t *handle,
6344 struct ocfs2_xattr_reflink *args,
6345 struct buffer_head *old_bh,
6346 struct ocfs2_xattr_header *xh,
6347 struct buffer_head *new_bh,
6348 struct ocfs2_xattr_header *new_xh,
6349 struct ocfs2_xattr_value_buf *vb,
6350 struct ocfs2_alloc_context *meta_ac,
6351 get_xattr_value_root *func,
6352 void *para)
6353 {
6354 int ret = 0, i, j;
6355 struct super_block *sb = args->old_inode->i_sb;
6356 struct buffer_head *value_bh;
6357 struct ocfs2_xattr_entry *xe, *last;
6358 struct ocfs2_xattr_value_root *xv, *new_xv;
6359 struct ocfs2_extent_tree data_et;
6360 u32 clusters, cpos, p_cluster, num_clusters;
6361 unsigned int ext_flags = 0;
6362
6363 trace_ocfs2_reflink_xattr_header((unsigned long long)old_bh->b_blocknr,
6364 le16_to_cpu(xh->xh_count));
6365
6366 last = &new_xh->xh_entries[le16_to_cpu(new_xh->xh_count)];
6367 for (i = 0, j = 0; i < le16_to_cpu(xh->xh_count); i++, j++) {
6368 xe = &xh->xh_entries[i];
6369
6370 if (args->xattr_reflinked && !args->xattr_reflinked(xe)) {
6371 xe = &new_xh->xh_entries[j];
6372
6373 le16_add_cpu(&new_xh->xh_count, -1);
6374 if (new_xh->xh_count) {
6375 memmove(xe, xe + 1,
6376 (void *)last - (void *)xe);
6377 memset(last, 0,
6378 sizeof(struct ocfs2_xattr_entry));
6379 }
6380
6381 /*
6382 * We don't want j to increase in the next round since
6383 * it is already moved ahead.
6384 */
6385 j--;
6386 continue;
6387 }
6388
6389 if (ocfs2_xattr_is_local(xe))
6390 continue;
6391
6392 ret = func(sb, old_bh, xh, i, &xv, NULL, para);
6393 if (ret) {
6394 mlog_errno(ret);
6395 break;
6396 }
6397
6398 ret = func(sb, new_bh, new_xh, j, &new_xv, &value_bh, para);
6399 if (ret) {
6400 mlog_errno(ret);
6401 break;
6402 }
6403
6404 /*
6405 * For the xattr which has l_tree_depth = 0, all the extent
6406 * recs have already be copied to the new xh with the
6407 * propriate OCFS2_EXT_REFCOUNTED flag we just need to
6408 * increase the refount count int the refcount tree.
6409 *
6410 * For the xattr which has l_tree_depth > 0, we need
6411 * to initialize it to the empty default value root,
6412 * and then insert the extents one by one.
6413 */
6414 if (xv->xr_list.l_tree_depth) {
6415 memcpy(new_xv, &def_xv, sizeof(def_xv));
6416 vb->vb_xv = new_xv;
6417 vb->vb_bh = value_bh;
6418 ocfs2_init_xattr_value_extent_tree(&data_et,
6419 INODE_CACHE(args->new_inode), vb);
6420 }
6421
6422 clusters = le32_to_cpu(xv->xr_clusters);
6423 cpos = 0;
6424 while (cpos < clusters) {
6425 ret = ocfs2_xattr_get_clusters(args->old_inode,
6426 cpos,
6427 &p_cluster,
6428 &num_clusters,
6429 &xv->xr_list,
6430 &ext_flags);
6431 if (ret) {
6432 mlog_errno(ret);
6433 goto out;
6434 }
6435
6436 BUG_ON(!p_cluster);
6437
6438 if (xv->xr_list.l_tree_depth) {
6439 ret = ocfs2_insert_extent(handle,
6440 &data_et, cpos,
6441 ocfs2_clusters_to_blocks(
6442 args->old_inode->i_sb,
6443 p_cluster),
6444 num_clusters, ext_flags,
6445 meta_ac);
6446 if (ret) {
6447 mlog_errno(ret);
6448 goto out;
6449 }
6450 }
6451
6452 ret = ocfs2_increase_refcount(handle, args->ref_ci,
6453 args->ref_root_bh,
6454 p_cluster, num_clusters,
6455 meta_ac, args->dealloc);
6456 if (ret) {
6457 mlog_errno(ret);
6458 goto out;
6459 }
6460
6461 cpos += num_clusters;
6462 }
6463 }
6464
6465 out:
6466 return ret;
6467 }
6468
6469 static int ocfs2_reflink_xattr_inline(struct ocfs2_xattr_reflink *args)
6470 {
6471 int ret = 0, credits = 0;
6472 handle_t *handle;
6473 struct ocfs2_super *osb = OCFS2_SB(args->old_inode->i_sb);
6474 struct ocfs2_dinode *di = (struct ocfs2_dinode *)args->old_bh->b_data;
6475 int inline_size = le16_to_cpu(di->i_xattr_inline_size);
6476 int header_off = osb->sb->s_blocksize - inline_size;
6477 struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)
6478 (args->old_bh->b_data + header_off);
6479 struct ocfs2_xattr_header *new_xh = (struct ocfs2_xattr_header *)
6480 (args->new_bh->b_data + header_off);
6481 struct ocfs2_alloc_context *meta_ac = NULL;
6482 struct ocfs2_inode_info *new_oi;
6483 struct ocfs2_dinode *new_di;
6484 struct ocfs2_xattr_value_buf vb = {
6485 .vb_bh = args->new_bh,
6486 .vb_access = ocfs2_journal_access_di,
6487 };
6488
6489 ret = ocfs2_reflink_lock_xattr_allocators(osb, xh, args->ref_root_bh,
6490 &credits, &meta_ac);
6491 if (ret) {
6492 mlog_errno(ret);
6493 goto out;
6494 }
6495
6496 handle = ocfs2_start_trans(osb, credits);
6497 if (IS_ERR(handle)) {
6498 ret = PTR_ERR(handle);
6499 mlog_errno(ret);
6500 goto out;
6501 }
6502
6503 ret = ocfs2_journal_access_di(handle, INODE_CACHE(args->new_inode),
6504 args->new_bh, OCFS2_JOURNAL_ACCESS_WRITE);
6505 if (ret) {
6506 mlog_errno(ret);
6507 goto out_commit;
6508 }
6509
6510 memcpy(args->new_bh->b_data + header_off,
6511 args->old_bh->b_data + header_off, inline_size);
6512
6513 new_di = (struct ocfs2_dinode *)args->new_bh->b_data;
6514 new_di->i_xattr_inline_size = cpu_to_le16(inline_size);
6515
6516 ret = ocfs2_reflink_xattr_header(handle, args, args->old_bh, xh,
6517 args->new_bh, new_xh, &vb, meta_ac,
6518 ocfs2_get_xattr_value_root, NULL);
6519 if (ret) {
6520 mlog_errno(ret);
6521 goto out_commit;
6522 }
6523
6524 new_oi = OCFS2_I(args->new_inode);
6525 /*
6526 * Adjust extent record count to reserve space for extended attribute.
6527 * Inline data count had been adjusted in ocfs2_duplicate_inline_data().
6528 */
6529 if (!(new_oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) &&
6530 !(ocfs2_inode_is_fast_symlink(args->new_inode))) {
6531 struct ocfs2_extent_list *el = &new_di->id2.i_list;
6532 le16_add_cpu(&el->l_count, -(inline_size /
6533 sizeof(struct ocfs2_extent_rec)));
6534 }
6535 spin_lock(&new_oi->ip_lock);
6536 new_oi->ip_dyn_features |= OCFS2_HAS_XATTR_FL | OCFS2_INLINE_XATTR_FL;
6537 new_di->i_dyn_features = cpu_to_le16(new_oi->ip_dyn_features);
6538 spin_unlock(&new_oi->ip_lock);
6539
6540 ocfs2_journal_dirty(handle, args->new_bh);
6541
6542 out_commit:
6543 ocfs2_commit_trans(osb, handle);
6544
6545 out:
6546 if (meta_ac)
6547 ocfs2_free_alloc_context(meta_ac);
6548 return ret;
6549 }
6550
6551 static int ocfs2_create_empty_xattr_block(struct inode *inode,
6552 struct buffer_head *fe_bh,
6553 struct buffer_head **ret_bh,
6554 int indexed)
6555 {
6556 int ret;
6557 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
6558 struct ocfs2_xattr_set_ctxt ctxt;
6559
6560 memset(&ctxt, 0, sizeof(ctxt));
6561 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &ctxt.meta_ac);
6562 if (ret < 0) {
6563 mlog_errno(ret);
6564 return ret;
6565 }
6566
6567 ctxt.handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_CREATE_CREDITS);
6568 if (IS_ERR(ctxt.handle)) {
6569 ret = PTR_ERR(ctxt.handle);
6570 mlog_errno(ret);
6571 goto out;
6572 }
6573
6574 trace_ocfs2_create_empty_xattr_block(
6575 (unsigned long long)fe_bh->b_blocknr, indexed);
6576 ret = ocfs2_create_xattr_block(inode, fe_bh, &ctxt, indexed,
6577 ret_bh);
6578 if (ret)
6579 mlog_errno(ret);
6580
6581 ocfs2_commit_trans(osb, ctxt.handle);
6582 out:
6583 ocfs2_free_alloc_context(ctxt.meta_ac);
6584 return ret;
6585 }
6586
6587 static int ocfs2_reflink_xattr_block(struct ocfs2_xattr_reflink *args,
6588 struct buffer_head *blk_bh,
6589 struct buffer_head *new_blk_bh)
6590 {
6591 int ret = 0, credits = 0;
6592 handle_t *handle;
6593 struct ocfs2_inode_info *new_oi = OCFS2_I(args->new_inode);
6594 struct ocfs2_dinode *new_di;
6595 struct ocfs2_super *osb = OCFS2_SB(args->new_inode->i_sb);
6596 int header_off = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
6597 struct ocfs2_xattr_block *xb =
6598 (struct ocfs2_xattr_block *)blk_bh->b_data;
6599 struct ocfs2_xattr_header *xh = &xb->xb_attrs.xb_header;
6600 struct ocfs2_xattr_block *new_xb =
6601 (struct ocfs2_xattr_block *)new_blk_bh->b_data;
6602 struct ocfs2_xattr_header *new_xh = &new_xb->xb_attrs.xb_header;
6603 struct ocfs2_alloc_context *meta_ac;
6604 struct ocfs2_xattr_value_buf vb = {
6605 .vb_bh = new_blk_bh,
6606 .vb_access = ocfs2_journal_access_xb,
6607 };
6608
6609 ret = ocfs2_reflink_lock_xattr_allocators(osb, xh, args->ref_root_bh,
6610 &credits, &meta_ac);
6611 if (ret) {
6612 mlog_errno(ret);
6613 return ret;
6614 }
6615
6616 /* One more credits in case we need to add xattr flags in new inode. */
6617 handle = ocfs2_start_trans(osb, credits + 1);
6618 if (IS_ERR(handle)) {
6619 ret = PTR_ERR(handle);
6620 mlog_errno(ret);
6621 goto out;
6622 }
6623
6624 if (!(new_oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) {
6625 ret = ocfs2_journal_access_di(handle,
6626 INODE_CACHE(args->new_inode),
6627 args->new_bh,
6628 OCFS2_JOURNAL_ACCESS_WRITE);
6629 if (ret) {
6630 mlog_errno(ret);
6631 goto out_commit;
6632 }
6633 }
6634
6635 ret = ocfs2_journal_access_xb(handle, INODE_CACHE(args->new_inode),
6636 new_blk_bh, OCFS2_JOURNAL_ACCESS_WRITE);
6637 if (ret) {
6638 mlog_errno(ret);
6639 goto out_commit;
6640 }
6641
6642 memcpy(new_blk_bh->b_data + header_off, blk_bh->b_data + header_off,
6643 osb->sb->s_blocksize - header_off);
6644
6645 ret = ocfs2_reflink_xattr_header(handle, args, blk_bh, xh,
6646 new_blk_bh, new_xh, &vb, meta_ac,
6647 ocfs2_get_xattr_value_root, NULL);
6648 if (ret) {
6649 mlog_errno(ret);
6650 goto out_commit;
6651 }
6652
6653 ocfs2_journal_dirty(handle, new_blk_bh);
6654
6655 if (!(new_oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) {
6656 new_di = (struct ocfs2_dinode *)args->new_bh->b_data;
6657 spin_lock(&new_oi->ip_lock);
6658 new_oi->ip_dyn_features |= OCFS2_HAS_XATTR_FL;
6659 new_di->i_dyn_features = cpu_to_le16(new_oi->ip_dyn_features);
6660 spin_unlock(&new_oi->ip_lock);
6661
6662 ocfs2_journal_dirty(handle, args->new_bh);
6663 }
6664
6665 out_commit:
6666 ocfs2_commit_trans(osb, handle);
6667
6668 out:
6669 ocfs2_free_alloc_context(meta_ac);
6670 return ret;
6671 }
6672
6673 struct ocfs2_reflink_xattr_tree_args {
6674 struct ocfs2_xattr_reflink *reflink;
6675 struct buffer_head *old_blk_bh;
6676 struct buffer_head *new_blk_bh;
6677 struct ocfs2_xattr_bucket *old_bucket;
6678 struct ocfs2_xattr_bucket *new_bucket;
6679 };
6680
6681 /*
6682 * NOTE:
6683 * We have to handle the case that both old bucket and new bucket
6684 * will call this function to get the right ret_bh.
6685 * So The caller must give us the right bh.
6686 */
6687 static int ocfs2_get_reflink_xattr_value_root(struct super_block *sb,
6688 struct buffer_head *bh,
6689 struct ocfs2_xattr_header *xh,
6690 int offset,
6691 struct ocfs2_xattr_value_root **xv,
6692 struct buffer_head **ret_bh,
6693 void *para)
6694 {
6695 struct ocfs2_reflink_xattr_tree_args *args =
6696 (struct ocfs2_reflink_xattr_tree_args *)para;
6697 struct ocfs2_xattr_bucket *bucket;
6698
6699 if (bh == args->old_bucket->bu_bhs[0])
6700 bucket = args->old_bucket;
6701 else
6702 bucket = args->new_bucket;
6703
6704 return ocfs2_get_xattr_tree_value_root(sb, bucket, offset,
6705 xv, ret_bh);
6706 }
6707
6708 struct ocfs2_value_tree_metas {
6709 int num_metas;
6710 int credits;
6711 int num_recs;
6712 };
6713
6714 static int ocfs2_value_tree_metas_in_bucket(struct super_block *sb,
6715 struct buffer_head *bh,
6716 struct ocfs2_xattr_header *xh,
6717 int offset,
6718 struct ocfs2_xattr_value_root **xv,
6719 struct buffer_head **ret_bh,
6720 void *para)
6721 {
6722 struct ocfs2_xattr_bucket *bucket =
6723 (struct ocfs2_xattr_bucket *)para;
6724
6725 return ocfs2_get_xattr_tree_value_root(sb, bucket, offset,
6726 xv, ret_bh);
6727 }
6728
6729 static int ocfs2_calc_value_tree_metas(struct inode *inode,
6730 struct ocfs2_xattr_bucket *bucket,
6731 void *para)
6732 {
6733 struct ocfs2_value_tree_metas *metas =
6734 (struct ocfs2_value_tree_metas *)para;
6735 struct ocfs2_xattr_header *xh =
6736 (struct ocfs2_xattr_header *)bucket->bu_bhs[0]->b_data;
6737
6738 /* Add the credits for this bucket first. */
6739 metas->credits += bucket->bu_blocks;
6740 return ocfs2_value_metas_in_xattr_header(inode->i_sb, bucket->bu_bhs[0],
6741 xh, &metas->num_metas,
6742 &metas->credits, &metas->num_recs,
6743 ocfs2_value_tree_metas_in_bucket,
6744 bucket);
6745 }
6746
6747 /*
6748 * Given a xattr extent rec starting from blkno and having len clusters,
6749 * iterate all the buckets calculate how much metadata we need for reflinking
6750 * all the ocfs2_xattr_value_root and lock the allocators accordingly.
6751 */
6752 static int ocfs2_lock_reflink_xattr_rec_allocators(
6753 struct ocfs2_reflink_xattr_tree_args *args,
6754 struct ocfs2_extent_tree *xt_et,
6755 u64 blkno, u32 len, int *credits,
6756 struct ocfs2_alloc_context **meta_ac,
6757 struct ocfs2_alloc_context **data_ac)
6758 {
6759 int ret, num_free_extents;
6760 struct ocfs2_value_tree_metas metas;
6761 struct ocfs2_super *osb = OCFS2_SB(args->reflink->old_inode->i_sb);
6762 struct ocfs2_refcount_block *rb;
6763
6764 memset(&metas, 0, sizeof(metas));
6765
6766 ret = ocfs2_iterate_xattr_buckets(args->reflink->old_inode, blkno, len,
6767 ocfs2_calc_value_tree_metas, &metas);
6768 if (ret) {
6769 mlog_errno(ret);
6770 goto out;
6771 }
6772
6773 *credits = metas.credits;
6774
6775 /*
6776 * Calculate we need for refcount tree change.
6777 *
6778 * We need to add/modify num_recs in refcount tree, so just calculate
6779 * an approximate number we need for refcount tree change.
6780 * Sometimes we need to split the tree, and after split, half recs
6781 * will be moved to the new block, and a new block can only provide
6782 * half number of recs. So we multiple new blocks by 2.
6783 * In the end, we have to add credits for modifying the already
6784 * existed refcount block.
6785 */
6786 rb = (struct ocfs2_refcount_block *)args->reflink->ref_root_bh->b_data;
6787 metas.num_recs =
6788 (metas.num_recs + ocfs2_refcount_recs_per_rb(osb->sb) - 1) /
6789 ocfs2_refcount_recs_per_rb(osb->sb) * 2;
6790 metas.num_metas += metas.num_recs;
6791 *credits += metas.num_recs +
6792 metas.num_recs * OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
6793 if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
6794 *credits += le16_to_cpu(rb->rf_list.l_tree_depth) *
6795 le16_to_cpu(rb->rf_list.l_next_free_rec) + 1;
6796 else
6797 *credits += 1;
6798
6799 /* count in the xattr tree change. */
6800 num_free_extents = ocfs2_num_free_extents(osb, xt_et);
6801 if (num_free_extents < 0) {
6802 ret = num_free_extents;
6803 mlog_errno(ret);
6804 goto out;
6805 }
6806
6807 if (num_free_extents < len)
6808 metas.num_metas += ocfs2_extend_meta_needed(xt_et->et_root_el);
6809
6810 *credits += ocfs2_calc_extend_credits(osb->sb,
6811 xt_et->et_root_el);
6812
6813 if (metas.num_metas) {
6814 ret = ocfs2_reserve_new_metadata_blocks(osb, metas.num_metas,
6815 meta_ac);
6816 if (ret) {
6817 mlog_errno(ret);
6818 goto out;
6819 }
6820 }
6821
6822 if (len) {
6823 ret = ocfs2_reserve_clusters(osb, len, data_ac);
6824 if (ret)
6825 mlog_errno(ret);
6826 }
6827 out:
6828 if (ret) {
6829 if (*meta_ac) {
6830 ocfs2_free_alloc_context(*meta_ac);
6831 *meta_ac = NULL;
6832 }
6833 }
6834
6835 return ret;
6836 }
6837
6838 static int ocfs2_reflink_xattr_bucket(handle_t *handle,
6839 u64 blkno, u64 new_blkno, u32 clusters,
6840 u32 *cpos, int num_buckets,
6841 struct ocfs2_alloc_context *meta_ac,
6842 struct ocfs2_alloc_context *data_ac,
6843 struct ocfs2_reflink_xattr_tree_args *args)
6844 {
6845 int i, j, ret = 0;
6846 struct super_block *sb = args->reflink->old_inode->i_sb;
6847 int bpb = args->old_bucket->bu_blocks;
6848 struct ocfs2_xattr_value_buf vb = {
6849 .vb_access = ocfs2_journal_access,
6850 };
6851
6852 for (i = 0; i < num_buckets; i++, blkno += bpb, new_blkno += bpb) {
6853 ret = ocfs2_read_xattr_bucket(args->old_bucket, blkno);
6854 if (ret) {
6855 mlog_errno(ret);
6856 break;
6857 }
6858
6859 ret = ocfs2_init_xattr_bucket(args->new_bucket, new_blkno, 1);
6860 if (ret) {
6861 mlog_errno(ret);
6862 break;
6863 }
6864
6865 ret = ocfs2_xattr_bucket_journal_access(handle,
6866 args->new_bucket,
6867 OCFS2_JOURNAL_ACCESS_CREATE);
6868 if (ret) {
6869 mlog_errno(ret);
6870 break;
6871 }
6872
6873 for (j = 0; j < bpb; j++)
6874 memcpy(bucket_block(args->new_bucket, j),
6875 bucket_block(args->old_bucket, j),
6876 sb->s_blocksize);
6877
6878 /*
6879 * Record the start cpos so that we can use it to initialize
6880 * our xattr tree we also set the xh_num_bucket for the new
6881 * bucket.
6882 */
6883 if (i == 0) {
6884 *cpos = le32_to_cpu(bucket_xh(args->new_bucket)->
6885 xh_entries[0].xe_name_hash);
6886 bucket_xh(args->new_bucket)->xh_num_buckets =
6887 cpu_to_le16(num_buckets);
6888 }
6889
6890 ocfs2_xattr_bucket_journal_dirty(handle, args->new_bucket);
6891
6892 ret = ocfs2_reflink_xattr_header(handle, args->reflink,
6893 args->old_bucket->bu_bhs[0],
6894 bucket_xh(args->old_bucket),
6895 args->new_bucket->bu_bhs[0],
6896 bucket_xh(args->new_bucket),
6897 &vb, meta_ac,
6898 ocfs2_get_reflink_xattr_value_root,
6899 args);
6900 if (ret) {
6901 mlog_errno(ret);
6902 break;
6903 }
6904
6905 /*
6906 * Re-access and dirty the bucket to calculate metaecc.
6907 * Because we may extend the transaction in reflink_xattr_header
6908 * which will let the already accessed block gone.
6909 */
6910 ret = ocfs2_xattr_bucket_journal_access(handle,
6911 args->new_bucket,
6912 OCFS2_JOURNAL_ACCESS_WRITE);
6913 if (ret) {
6914 mlog_errno(ret);
6915 break;
6916 }
6917
6918 ocfs2_xattr_bucket_journal_dirty(handle, args->new_bucket);
6919
6920 ocfs2_xattr_bucket_relse(args->old_bucket);
6921 ocfs2_xattr_bucket_relse(args->new_bucket);
6922 }
6923
6924 ocfs2_xattr_bucket_relse(args->old_bucket);
6925 ocfs2_xattr_bucket_relse(args->new_bucket);
6926 return ret;
6927 }
6928
6929 static int ocfs2_reflink_xattr_buckets(handle_t *handle,
6930 struct inode *inode,
6931 struct ocfs2_reflink_xattr_tree_args *args,
6932 struct ocfs2_extent_tree *et,
6933 struct ocfs2_alloc_context *meta_ac,
6934 struct ocfs2_alloc_context *data_ac,
6935 u64 blkno, u32 cpos, u32 len)
6936 {
6937 int ret, first_inserted = 0;
6938 u32 p_cluster, num_clusters, reflink_cpos = 0;
6939 u64 new_blkno;
6940 unsigned int num_buckets, reflink_buckets;
6941 unsigned int bpc =
6942 ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
6943
6944 ret = ocfs2_read_xattr_bucket(args->old_bucket, blkno);
6945 if (ret) {
6946 mlog_errno(ret);
6947 goto out;
6948 }
6949 num_buckets = le16_to_cpu(bucket_xh(args->old_bucket)->xh_num_buckets);
6950 ocfs2_xattr_bucket_relse(args->old_bucket);
6951
6952 while (len && num_buckets) {
6953 ret = ocfs2_claim_clusters(handle, data_ac,
6954 1, &p_cluster, &num_clusters);
6955 if (ret) {
6956 mlog_errno(ret);
6957 goto out;
6958 }
6959
6960 new_blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
6961 reflink_buckets = min(num_buckets, bpc * num_clusters);
6962
6963 ret = ocfs2_reflink_xattr_bucket(handle, blkno,
6964 new_blkno, num_clusters,
6965 &reflink_cpos, reflink_buckets,
6966 meta_ac, data_ac, args);
6967 if (ret) {
6968 mlog_errno(ret);
6969 goto out;
6970 }
6971
6972 /*
6973 * For the 1st allocated cluster, we make it use the same cpos
6974 * so that the xattr tree looks the same as the original one
6975 * in the most case.
6976 */
6977 if (!first_inserted) {
6978 reflink_cpos = cpos;
6979 first_inserted = 1;
6980 }
6981 ret = ocfs2_insert_extent(handle, et, reflink_cpos, new_blkno,
6982 num_clusters, 0, meta_ac);
6983 if (ret)
6984 mlog_errno(ret);
6985
6986 trace_ocfs2_reflink_xattr_buckets((unsigned long long)new_blkno,
6987 num_clusters, reflink_cpos);
6988
6989 len -= num_clusters;
6990 blkno += ocfs2_clusters_to_blocks(inode->i_sb, num_clusters);
6991 num_buckets -= reflink_buckets;
6992 }
6993 out:
6994 return ret;
6995 }
6996
6997 /*
6998 * Create the same xattr extent record in the new inode's xattr tree.
6999 */
7000 static int ocfs2_reflink_xattr_rec(struct inode *inode,
7001 struct buffer_head *root_bh,
7002 u64 blkno,
7003 u32 cpos,
7004 u32 len,
7005 void *para)
7006 {
7007 int ret, credits = 0;
7008 handle_t *handle;
7009 struct ocfs2_reflink_xattr_tree_args *args =
7010 (struct ocfs2_reflink_xattr_tree_args *)para;
7011 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
7012 struct ocfs2_alloc_context *meta_ac = NULL;
7013 struct ocfs2_alloc_context *data_ac = NULL;
7014 struct ocfs2_extent_tree et;
7015
7016 trace_ocfs2_reflink_xattr_rec((unsigned long long)blkno, len);
7017
7018 ocfs2_init_xattr_tree_extent_tree(&et,
7019 INODE_CACHE(args->reflink->new_inode),
7020 args->new_blk_bh);
7021
7022 ret = ocfs2_lock_reflink_xattr_rec_allocators(args, &et, blkno,
7023 len, &credits,
7024 &meta_ac, &data_ac);
7025 if (ret) {
7026 mlog_errno(ret);
7027 goto out;
7028 }
7029
7030 handle = ocfs2_start_trans(osb, credits);
7031 if (IS_ERR(handle)) {
7032 ret = PTR_ERR(handle);
7033 mlog_errno(ret);
7034 goto out;
7035 }
7036
7037 ret = ocfs2_reflink_xattr_buckets(handle, inode, args, &et,
7038 meta_ac, data_ac,
7039 blkno, cpos, len);
7040 if (ret)
7041 mlog_errno(ret);
7042
7043 ocfs2_commit_trans(osb, handle);
7044
7045 out:
7046 if (meta_ac)
7047 ocfs2_free_alloc_context(meta_ac);
7048 if (data_ac)
7049 ocfs2_free_alloc_context(data_ac);
7050 return ret;
7051 }
7052
7053 /*
7054 * Create reflinked xattr buckets.
7055 * We will add bucket one by one, and refcount all the xattrs in the bucket
7056 * if they are stored outside.
7057 */
7058 static int ocfs2_reflink_xattr_tree(struct ocfs2_xattr_reflink *args,
7059 struct buffer_head *blk_bh,
7060 struct buffer_head *new_blk_bh)
7061 {
7062 int ret;
7063 struct ocfs2_reflink_xattr_tree_args para;
7064
7065 memset(&para, 0, sizeof(para));
7066 para.reflink = args;
7067 para.old_blk_bh = blk_bh;
7068 para.new_blk_bh = new_blk_bh;
7069
7070 para.old_bucket = ocfs2_xattr_bucket_new(args->old_inode);
7071 if (!para.old_bucket) {
7072 mlog_errno(-ENOMEM);
7073 return -ENOMEM;
7074 }
7075
7076 para.new_bucket = ocfs2_xattr_bucket_new(args->new_inode);
7077 if (!para.new_bucket) {
7078 ret = -ENOMEM;
7079 mlog_errno(ret);
7080 goto out;
7081 }
7082
7083 ret = ocfs2_iterate_xattr_index_block(args->old_inode, blk_bh,
7084 ocfs2_reflink_xattr_rec,
7085 &para);
7086 if (ret)
7087 mlog_errno(ret);
7088
7089 out:
7090 ocfs2_xattr_bucket_free(para.old_bucket);
7091 ocfs2_xattr_bucket_free(para.new_bucket);
7092 return ret;
7093 }
7094
7095 static int ocfs2_reflink_xattr_in_block(struct ocfs2_xattr_reflink *args,
7096 struct buffer_head *blk_bh)
7097 {
7098 int ret, indexed = 0;
7099 struct buffer_head *new_blk_bh = NULL;
7100 struct ocfs2_xattr_block *xb =
7101 (struct ocfs2_xattr_block *)blk_bh->b_data;
7102
7103
7104 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)
7105 indexed = 1;
7106
7107 ret = ocfs2_create_empty_xattr_block(args->new_inode, args->new_bh,
7108 &new_blk_bh, indexed);
7109 if (ret) {
7110 mlog_errno(ret);
7111 goto out;
7112 }
7113
7114 if (!indexed)
7115 ret = ocfs2_reflink_xattr_block(args, blk_bh, new_blk_bh);
7116 else
7117 ret = ocfs2_reflink_xattr_tree(args, blk_bh, new_blk_bh);
7118 if (ret)
7119 mlog_errno(ret);
7120
7121 out:
7122 brelse(new_blk_bh);
7123 return ret;
7124 }
7125
7126 static int ocfs2_reflink_xattr_no_security(struct ocfs2_xattr_entry *xe)
7127 {
7128 int type = ocfs2_xattr_get_type(xe);
7129
7130 return type != OCFS2_XATTR_INDEX_SECURITY &&
7131 type != OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS &&
7132 type != OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
7133 }
7134
7135 int ocfs2_reflink_xattrs(struct inode *old_inode,
7136 struct buffer_head *old_bh,
7137 struct inode *new_inode,
7138 struct buffer_head *new_bh,
7139 bool preserve_security)
7140 {
7141 int ret;
7142 struct ocfs2_xattr_reflink args;
7143 struct ocfs2_inode_info *oi = OCFS2_I(old_inode);
7144 struct ocfs2_dinode *di = (struct ocfs2_dinode *)old_bh->b_data;
7145 struct buffer_head *blk_bh = NULL;
7146 struct ocfs2_cached_dealloc_ctxt dealloc;
7147 struct ocfs2_refcount_tree *ref_tree;
7148 struct buffer_head *ref_root_bh = NULL;
7149
7150 ret = ocfs2_lock_refcount_tree(OCFS2_SB(old_inode->i_sb),
7151 le64_to_cpu(di->i_refcount_loc),
7152 1, &ref_tree, &ref_root_bh);
7153 if (ret) {
7154 mlog_errno(ret);
7155 goto out;
7156 }
7157
7158 ocfs2_init_dealloc_ctxt(&dealloc);
7159
7160 args.old_inode = old_inode;
7161 args.new_inode = new_inode;
7162 args.old_bh = old_bh;
7163 args.new_bh = new_bh;
7164 args.ref_ci = &ref_tree->rf_ci;
7165 args.ref_root_bh = ref_root_bh;
7166 args.dealloc = &dealloc;
7167 if (preserve_security)
7168 args.xattr_reflinked = NULL;
7169 else
7170 args.xattr_reflinked = ocfs2_reflink_xattr_no_security;
7171
7172 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
7173 ret = ocfs2_reflink_xattr_inline(&args);
7174 if (ret) {
7175 mlog_errno(ret);
7176 goto out_unlock;
7177 }
7178 }
7179
7180 if (!di->i_xattr_loc)
7181 goto out_unlock;
7182
7183 ret = ocfs2_read_xattr_block(old_inode, le64_to_cpu(di->i_xattr_loc),
7184 &blk_bh);
7185 if (ret < 0) {
7186 mlog_errno(ret);
7187 goto out_unlock;
7188 }
7189
7190 ret = ocfs2_reflink_xattr_in_block(&args, blk_bh);
7191 if (ret)
7192 mlog_errno(ret);
7193
7194 brelse(blk_bh);
7195
7196 out_unlock:
7197 ocfs2_unlock_refcount_tree(OCFS2_SB(old_inode->i_sb),
7198 ref_tree, 1);
7199 brelse(ref_root_bh);
7200
7201 if (ocfs2_dealloc_has_cluster(&dealloc)) {
7202 ocfs2_schedule_truncate_log_flush(OCFS2_SB(old_inode->i_sb), 1);
7203 ocfs2_run_deallocs(OCFS2_SB(old_inode->i_sb), &dealloc);
7204 }
7205
7206 out:
7207 return ret;
7208 }
7209
7210 /*
7211 * Initialize security and acl for a already created inode.
7212 * Used for reflink a non-preserve-security file.
7213 *
7214 * It uses common api like ocfs2_xattr_set, so the caller
7215 * must not hold any lock expect i_mutex.
7216 */
7217 int ocfs2_init_security_and_acl(struct inode *dir,
7218 struct inode *inode,
7219 const struct qstr *qstr,
7220 struct posix_acl *default_acl,
7221 struct posix_acl *acl)
7222 {
7223 struct buffer_head *dir_bh = NULL;
7224 int ret = 0;
7225
7226 ret = ocfs2_init_security_get(inode, dir, qstr, NULL);
7227 if (ret) {
7228 mlog_errno(ret);
7229 goto leave;
7230 }
7231
7232 ret = ocfs2_inode_lock(dir, &dir_bh, 0);
7233 if (ret) {
7234 mlog_errno(ret);
7235 goto leave;
7236 }
7237
7238 if (!ret && default_acl)
7239 ret = ocfs2_iop_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
7240 if (!ret && acl)
7241 ret = ocfs2_iop_set_acl(inode, acl, ACL_TYPE_ACCESS);
7242
7243 ocfs2_inode_unlock(dir, 0);
7244 brelse(dir_bh);
7245 leave:
7246 return ret;
7247 }
7248
7249 /*
7250 * 'security' attributes support
7251 */
7252 static int ocfs2_xattr_security_get(const struct xattr_handler *handler,
7253 struct dentry *dentry, const char *name,
7254 void *buffer, size_t size)
7255 {
7256 return ocfs2_xattr_get(d_inode(dentry), OCFS2_XATTR_INDEX_SECURITY,
7257 name, buffer, size);
7258 }
7259
7260 static int ocfs2_xattr_security_set(const struct xattr_handler *handler,
7261 struct dentry *dentry, const char *name,
7262 const void *value, size_t size, int flags)
7263 {
7264 return ocfs2_xattr_set(d_inode(dentry), OCFS2_XATTR_INDEX_SECURITY,
7265 name, value, size, flags);
7266 }
7267
7268 static int ocfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
7269 void *fs_info)
7270 {
7271 const struct xattr *xattr;
7272 int err = 0;
7273
7274 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
7275 err = ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_SECURITY,
7276 xattr->name, xattr->value,
7277 xattr->value_len, XATTR_CREATE);
7278 if (err)
7279 break;
7280 }
7281 return err;
7282 }
7283
7284 int ocfs2_init_security_get(struct inode *inode,
7285 struct inode *dir,
7286 const struct qstr *qstr,
7287 struct ocfs2_security_xattr_info *si)
7288 {
7289 /* check whether ocfs2 support feature xattr */
7290 if (!ocfs2_supports_xattr(OCFS2_SB(dir->i_sb)))
7291 return -EOPNOTSUPP;
7292 if (si)
7293 return security_old_inode_init_security(inode, dir, qstr,
7294 &si->name, &si->value,
7295 &si->value_len);
7296
7297 return security_inode_init_security(inode, dir, qstr,
7298 &ocfs2_initxattrs, NULL);
7299 }
7300
7301 int ocfs2_init_security_set(handle_t *handle,
7302 struct inode *inode,
7303 struct buffer_head *di_bh,
7304 struct ocfs2_security_xattr_info *si,
7305 struct ocfs2_alloc_context *xattr_ac,
7306 struct ocfs2_alloc_context *data_ac)
7307 {
7308 return ocfs2_xattr_set_handle(handle, inode, di_bh,
7309 OCFS2_XATTR_INDEX_SECURITY,
7310 si->name, si->value, si->value_len, 0,
7311 xattr_ac, data_ac);
7312 }
7313
7314 const struct xattr_handler ocfs2_xattr_security_handler = {
7315 .prefix = XATTR_SECURITY_PREFIX,
7316 .get = ocfs2_xattr_security_get,
7317 .set = ocfs2_xattr_security_set,
7318 };
7319
7320 /*
7321 * 'trusted' attributes support
7322 */
7323 static int ocfs2_xattr_trusted_get(const struct xattr_handler *handler,
7324 struct dentry *dentry, const char *name,
7325 void *buffer, size_t size)
7326 {
7327 return ocfs2_xattr_get(d_inode(dentry), OCFS2_XATTR_INDEX_TRUSTED,
7328 name, buffer, size);
7329 }
7330
7331 static int ocfs2_xattr_trusted_set(const struct xattr_handler *handler,
7332 struct dentry *dentry, const char *name,
7333 const void *value, size_t size, int flags)
7334 {
7335 return ocfs2_xattr_set(d_inode(dentry), OCFS2_XATTR_INDEX_TRUSTED,
7336 name, value, size, flags);
7337 }
7338
7339 const struct xattr_handler ocfs2_xattr_trusted_handler = {
7340 .prefix = XATTR_TRUSTED_PREFIX,
7341 .get = ocfs2_xattr_trusted_get,
7342 .set = ocfs2_xattr_trusted_set,
7343 };
7344
7345 /*
7346 * 'user' attributes support
7347 */
7348 static int ocfs2_xattr_user_get(const struct xattr_handler *handler,
7349 struct dentry *dentry, const char *name,
7350 void *buffer, size_t size)
7351 {
7352 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7353
7354 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7355 return -EOPNOTSUPP;
7356 return ocfs2_xattr_get(d_inode(dentry), OCFS2_XATTR_INDEX_USER, name,
7357 buffer, size);
7358 }
7359
7360 static int ocfs2_xattr_user_set(const struct xattr_handler *handler,
7361 struct dentry *dentry, const char *name,
7362 const void *value, size_t size, int flags)
7363 {
7364 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7365
7366 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7367 return -EOPNOTSUPP;
7368
7369 return ocfs2_xattr_set(d_inode(dentry), OCFS2_XATTR_INDEX_USER,
7370 name, value, size, flags);
7371 }
7372
7373 const struct xattr_handler ocfs2_xattr_user_handler = {
7374 .prefix = XATTR_USER_PREFIX,
7375 .get = ocfs2_xattr_user_get,
7376 .set = ocfs2_xattr_user_set,
7377 };
Linux with added FPC-III support