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Linux 3.0.46
[linux/fpc-iii.git] / fs / ocfs2 / xattr.c
blob81ecf9c0bf0ad41e0ac2fd523b1538afc3f57a07
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 &ocfs2_xattr_acl_access_handler,
103 &ocfs2_xattr_acl_default_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 = &ocfs2_xattr_acl_access_handler,
113 [OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT]
114 = &ocfs2_xattr_acl_default_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)
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 = -EIO;
381 mlog_errno(rc);
382 break;
383 }
384
385 if (!ocfs2_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
386 bucket->bu_bhs[i]))
387 ocfs2_set_new_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
388 bucket->bu_bhs[i]);
389 }
390
391 if (rc)
392 ocfs2_xattr_bucket_relse(bucket);
393 return rc;
394 }
395
396 /* Read the xattr bucket at xb_blkno */
397 static int ocfs2_read_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
398 u64 xb_blkno)
399 {
400 int rc;
401
402 rc = ocfs2_read_blocks(INODE_CACHE(bucket->bu_inode), xb_blkno,
403 bucket->bu_blocks, bucket->bu_bhs, 0,
404 NULL);
405 if (!rc) {
406 spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
407 rc = ocfs2_validate_meta_ecc_bhs(bucket->bu_inode->i_sb,
408 bucket->bu_bhs,
409 bucket->bu_blocks,
410 &bucket_xh(bucket)->xh_check);
411 spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
412 if (rc)
413 mlog_errno(rc);
414 }
415
416 if (rc)
417 ocfs2_xattr_bucket_relse(bucket);
418 return rc;
419 }
420
421 static int ocfs2_xattr_bucket_journal_access(handle_t *handle,
422 struct ocfs2_xattr_bucket *bucket,
423 int type)
424 {
425 int i, rc = 0;
426
427 for (i = 0; i < bucket->bu_blocks; i++) {
428 rc = ocfs2_journal_access(handle,
429 INODE_CACHE(bucket->bu_inode),
430 bucket->bu_bhs[i], type);
431 if (rc) {
432 mlog_errno(rc);
433 break;
434 }
435 }
436
437 return rc;
438 }
439
440 static void ocfs2_xattr_bucket_journal_dirty(handle_t *handle,
441 struct ocfs2_xattr_bucket *bucket)
442 {
443 int i;
444
445 spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
446 ocfs2_compute_meta_ecc_bhs(bucket->bu_inode->i_sb,
447 bucket->bu_bhs, bucket->bu_blocks,
448 &bucket_xh(bucket)->xh_check);
449 spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
450
451 for (i = 0; i < bucket->bu_blocks; i++)
452 ocfs2_journal_dirty(handle, bucket->bu_bhs[i]);
453 }
454
455 static void ocfs2_xattr_bucket_copy_data(struct ocfs2_xattr_bucket *dest,
456 struct ocfs2_xattr_bucket *src)
457 {
458 int i;
459 int blocksize = src->bu_inode->i_sb->s_blocksize;
460
461 BUG_ON(dest->bu_blocks != src->bu_blocks);
462 BUG_ON(dest->bu_inode != src->bu_inode);
463
464 for (i = 0; i < src->bu_blocks; i++) {
465 memcpy(bucket_block(dest, i), bucket_block(src, i),
466 blocksize);
467 }
468 }
469
470 static int ocfs2_validate_xattr_block(struct super_block *sb,
471 struct buffer_head *bh)
472 {
473 int rc;
474 struct ocfs2_xattr_block *xb =
475 (struct ocfs2_xattr_block *)bh->b_data;
476
477 trace_ocfs2_validate_xattr_block((unsigned long long)bh->b_blocknr);
478
479 BUG_ON(!buffer_uptodate(bh));
480
481 /*
482 * If the ecc fails, we return the error but otherwise
483 * leave the filesystem running. We know any error is
484 * local to this block.
485 */
486 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &xb->xb_check);
487 if (rc)
488 return rc;
489
490 /*
491 * Errors after here are fatal
492 */
493
494 if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
495 ocfs2_error(sb,
496 "Extended attribute block #%llu has bad "
497 "signature %.*s",
498 (unsigned long long)bh->b_blocknr, 7,
499 xb->xb_signature);
500 return -EINVAL;
501 }
502
503 if (le64_to_cpu(xb->xb_blkno) != bh->b_blocknr) {
504 ocfs2_error(sb,
505 "Extended attribute block #%llu has an "
506 "invalid xb_blkno of %llu",
507 (unsigned long long)bh->b_blocknr,
508 (unsigned long long)le64_to_cpu(xb->xb_blkno));
509 return -EINVAL;
510 }
511
512 if (le32_to_cpu(xb->xb_fs_generation) != OCFS2_SB(sb)->fs_generation) {
513 ocfs2_error(sb,
514 "Extended attribute block #%llu has an invalid "
515 "xb_fs_generation of #%u",
516 (unsigned long long)bh->b_blocknr,
517 le32_to_cpu(xb->xb_fs_generation));
518 return -EINVAL;
519 }
520
521 return 0;
522 }
523
524 static int ocfs2_read_xattr_block(struct inode *inode, u64 xb_blkno,
525 struct buffer_head **bh)
526 {
527 int rc;
528 struct buffer_head *tmp = *bh;
529
530 rc = ocfs2_read_block(INODE_CACHE(inode), xb_blkno, &tmp,
531 ocfs2_validate_xattr_block);
532
533 /* If ocfs2_read_block() got us a new bh, pass it up. */
534 if (!rc && !*bh)
535 *bh = tmp;
536
537 return rc;
538 }
539
540 static inline const char *ocfs2_xattr_prefix(int name_index)
541 {
542 const struct xattr_handler *handler = NULL;
543
544 if (name_index > 0 && name_index < OCFS2_XATTR_MAX)
545 handler = ocfs2_xattr_handler_map[name_index];
546
547 return handler ? handler->prefix : NULL;
548 }
549
550 static u32 ocfs2_xattr_name_hash(struct inode *inode,
551 const char *name,
552 int name_len)
553 {
554 /* Get hash value of uuid from super block */
555 u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash;
556 int i;
557
558 /* hash extended attribute name */
559 for (i = 0; i < name_len; i++) {
560 hash = (hash << OCFS2_HASH_SHIFT) ^
561 (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
562 *name++;
563 }
564
565 return hash;
566 }
567
568 static int ocfs2_xattr_entry_real_size(int name_len, size_t value_len)
569 {
570 return namevalue_size(name_len, value_len) +
571 sizeof(struct ocfs2_xattr_entry);
572 }
573
574 static int ocfs2_xi_entry_usage(struct ocfs2_xattr_info *xi)
575 {
576 return namevalue_size_xi(xi) +
577 sizeof(struct ocfs2_xattr_entry);
578 }
579
580 static int ocfs2_xe_entry_usage(struct ocfs2_xattr_entry *xe)
581 {
582 return namevalue_size_xe(xe) +
583 sizeof(struct ocfs2_xattr_entry);
584 }
585
586 int ocfs2_calc_security_init(struct inode *dir,
587 struct ocfs2_security_xattr_info *si,
588 int *want_clusters,
589 int *xattr_credits,
590 struct ocfs2_alloc_context **xattr_ac)
591 {
592 int ret = 0;
593 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
594 int s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
595 si->value_len);
596
597 /*
598 * The max space of security xattr taken inline is
599 * 256(name) + 80(value) + 16(entry) = 352 bytes,
600 * So reserve one metadata block for it is ok.
601 */
602 if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
603 s_size > OCFS2_XATTR_FREE_IN_IBODY) {
604 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, xattr_ac);
605 if (ret) {
606 mlog_errno(ret);
607 return ret;
608 }
609 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
610 }
611
612 /* reserve clusters for xattr value which will be set in B tree*/
613 if (si->value_len > OCFS2_XATTR_INLINE_SIZE) {
614 int new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
615 si->value_len);
616
617 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
618 new_clusters);
619 *want_clusters += new_clusters;
620 }
621 return ret;
622 }
623
624 int ocfs2_calc_xattr_init(struct inode *dir,
625 struct buffer_head *dir_bh,
626 int mode,
627 struct ocfs2_security_xattr_info *si,
628 int *want_clusters,
629 int *xattr_credits,
630 int *want_meta)
631 {
632 int ret = 0;
633 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
634 int s_size = 0, a_size = 0, acl_len = 0, new_clusters;
635
636 if (si->enable)
637 s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
638 si->value_len);
639
640 if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
641 acl_len = ocfs2_xattr_get_nolock(dir, dir_bh,
642 OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT,
643 "", NULL, 0);
644 if (acl_len > 0) {
645 a_size = ocfs2_xattr_entry_real_size(0, acl_len);
646 if (S_ISDIR(mode))
647 a_size <<= 1;
648 } else if (acl_len != 0 && acl_len != -ENODATA) {
649 mlog_errno(ret);
650 return ret;
651 }
652 }
653
654 if (!(s_size + a_size))
655 return ret;
656
657 /*
658 * The max space of security xattr taken inline is
659 * 256(name) + 80(value) + 16(entry) = 352 bytes,
660 * The max space of acl xattr taken inline is
661 * 80(value) + 16(entry) * 2(if directory) = 192 bytes,
662 * when blocksize = 512, may reserve one more cluser for
663 * xattr bucket, otherwise reserve one metadata block
664 * for them is ok.
665 * If this is a new directory with inline data,
666 * we choose to reserve the entire inline area for
667 * directory contents and force an external xattr block.
668 */
669 if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
670 (S_ISDIR(mode) && ocfs2_supports_inline_data(osb)) ||
671 (s_size + a_size) > OCFS2_XATTR_FREE_IN_IBODY) {
672 *want_meta = *want_meta + 1;
673 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
674 }
675
676 if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE &&
677 (s_size + a_size) > OCFS2_XATTR_FREE_IN_BLOCK(dir)) {
678 *want_clusters += 1;
679 *xattr_credits += ocfs2_blocks_per_xattr_bucket(dir->i_sb);
680 }
681
682 /*
683 * reserve credits and clusters for xattrs which has large value
684 * and have to be set outside
685 */
686 if (si->enable && si->value_len > OCFS2_XATTR_INLINE_SIZE) {
687 new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
688 si->value_len);
689 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
690 new_clusters);
691 *want_clusters += new_clusters;
692 }
693 if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL &&
694 acl_len > OCFS2_XATTR_INLINE_SIZE) {
695 /* for directory, it has DEFAULT and ACCESS two types of acls */
696 new_clusters = (S_ISDIR(mode) ? 2 : 1) *
697 ocfs2_clusters_for_bytes(dir->i_sb, acl_len);
698 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
699 new_clusters);
700 *want_clusters += new_clusters;
701 }
702
703 return ret;
704 }
705
706 static int ocfs2_xattr_extend_allocation(struct inode *inode,
707 u32 clusters_to_add,
708 struct ocfs2_xattr_value_buf *vb,
709 struct ocfs2_xattr_set_ctxt *ctxt)
710 {
711 int status = 0, 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 clusters_to_add);
759 status = ocfs2_extend_trans(handle, credits);
760 if (status < 0) {
761 status = -ENOMEM;
762 mlog_errno(status);
763 break;
764 }
765 }
766 }
767
768 return status;
769 }
770
771 static int __ocfs2_remove_xattr_range(struct inode *inode,
772 struct ocfs2_xattr_value_buf *vb,
773 u32 cpos, u32 phys_cpos, u32 len,
774 unsigned int ext_flags,
775 struct ocfs2_xattr_set_ctxt *ctxt)
776 {
777 int ret;
778 u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
779 handle_t *handle = ctxt->handle;
780 struct ocfs2_extent_tree et;
781
782 ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
783
784 ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
785 OCFS2_JOURNAL_ACCESS_WRITE);
786 if (ret) {
787 mlog_errno(ret);
788 goto out;
789 }
790
791 ret = ocfs2_remove_extent(handle, &et, cpos, len, ctxt->meta_ac,
792 &ctxt->dealloc);
793 if (ret) {
794 mlog_errno(ret);
795 goto out;
796 }
797
798 le32_add_cpu(&vb->vb_xv->xr_clusters, -len);
799 ocfs2_journal_dirty(handle, vb->vb_bh);
800
801 if (ext_flags & OCFS2_EXT_REFCOUNTED)
802 ret = ocfs2_decrease_refcount(inode, handle,
803 ocfs2_blocks_to_clusters(inode->i_sb,
804 phys_blkno),
805 len, ctxt->meta_ac, &ctxt->dealloc, 1);
806 else
807 ret = ocfs2_cache_cluster_dealloc(&ctxt->dealloc,
808 phys_blkno, len);
809 if (ret)
810 mlog_errno(ret);
811
812 out:
813 return ret;
814 }
815
816 static int ocfs2_xattr_shrink_size(struct inode *inode,
817 u32 old_clusters,
818 u32 new_clusters,
819 struct ocfs2_xattr_value_buf *vb,
820 struct ocfs2_xattr_set_ctxt *ctxt)
821 {
822 int ret = 0;
823 unsigned int ext_flags;
824 u32 trunc_len, cpos, phys_cpos, alloc_size;
825 u64 block;
826
827 if (old_clusters <= new_clusters)
828 return 0;
829
830 cpos = new_clusters;
831 trunc_len = old_clusters - new_clusters;
832 while (trunc_len) {
833 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
834 &alloc_size,
835 &vb->vb_xv->xr_list, &ext_flags);
836 if (ret) {
837 mlog_errno(ret);
838 goto out;
839 }
840
841 if (alloc_size > trunc_len)
842 alloc_size = trunc_len;
843
844 ret = __ocfs2_remove_xattr_range(inode, vb, cpos,
845 phys_cpos, alloc_size,
846 ext_flags, ctxt);
847 if (ret) {
848 mlog_errno(ret);
849 goto out;
850 }
851
852 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
853 ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode),
854 block, alloc_size);
855 cpos += alloc_size;
856 trunc_len -= alloc_size;
857 }
858
859 out:
860 return ret;
861 }
862
863 static int ocfs2_xattr_value_truncate(struct inode *inode,
864 struct ocfs2_xattr_value_buf *vb,
865 int len,
866 struct ocfs2_xattr_set_ctxt *ctxt)
867 {
868 int ret;
869 u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
870 u32 old_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
871
872 if (new_clusters == old_clusters)
873 return 0;
874
875 if (new_clusters > old_clusters)
876 ret = ocfs2_xattr_extend_allocation(inode,
877 new_clusters - old_clusters,
878 vb, ctxt);
879 else
880 ret = ocfs2_xattr_shrink_size(inode,
881 old_clusters, new_clusters,
882 vb, ctxt);
883
884 return ret;
885 }
886
887 static int ocfs2_xattr_list_entry(char *buffer, size_t size,
888 size_t *result, const char *prefix,
889 const char *name, int name_len)
890 {
891 char *p = buffer + *result;
892 int prefix_len = strlen(prefix);
893 int total_len = prefix_len + name_len + 1;
894
895 *result += total_len;
896
897 /* we are just looking for how big our buffer needs to be */
898 if (!size)
899 return 0;
900
901 if (*result > size)
902 return -ERANGE;
903
904 memcpy(p, prefix, prefix_len);
905 memcpy(p + prefix_len, name, name_len);
906 p[prefix_len + name_len] = '\0';
907
908 return 0;
909 }
910
911 static int ocfs2_xattr_list_entries(struct inode *inode,
912 struct ocfs2_xattr_header *header,
913 char *buffer, size_t buffer_size)
914 {
915 size_t result = 0;
916 int i, type, ret;
917 const char *prefix, *name;
918
919 for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
920 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
921 type = ocfs2_xattr_get_type(entry);
922 prefix = ocfs2_xattr_prefix(type);
923
924 if (prefix) {
925 name = (const char *)header +
926 le16_to_cpu(entry->xe_name_offset);
927
928 ret = ocfs2_xattr_list_entry(buffer, buffer_size,
929 &result, prefix, name,
930 entry->xe_name_len);
931 if (ret)
932 return ret;
933 }
934 }
935
936 return result;
937 }
938
939 int ocfs2_has_inline_xattr_value_outside(struct inode *inode,
940 struct ocfs2_dinode *di)
941 {
942 struct ocfs2_xattr_header *xh;
943 int i;
944
945 xh = (struct ocfs2_xattr_header *)
946 ((void *)di + inode->i_sb->s_blocksize -
947 le16_to_cpu(di->i_xattr_inline_size));
948
949 for (i = 0; i < le16_to_cpu(xh->xh_count); i++)
950 if (!ocfs2_xattr_is_local(&xh->xh_entries[i]))
951 return 1;
952
953 return 0;
954 }
955
956 static int ocfs2_xattr_ibody_list(struct inode *inode,
957 struct ocfs2_dinode *di,
958 char *buffer,
959 size_t buffer_size)
960 {
961 struct ocfs2_xattr_header *header = NULL;
962 struct ocfs2_inode_info *oi = OCFS2_I(inode);
963 int ret = 0;
964
965 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
966 return ret;
967
968 header = (struct ocfs2_xattr_header *)
969 ((void *)di + inode->i_sb->s_blocksize -
970 le16_to_cpu(di->i_xattr_inline_size));
971
972 ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size);
973
974 return ret;
975 }
976
977 static int ocfs2_xattr_block_list(struct inode *inode,
978 struct ocfs2_dinode *di,
979 char *buffer,
980 size_t buffer_size)
981 {
982 struct buffer_head *blk_bh = NULL;
983 struct ocfs2_xattr_block *xb;
984 int ret = 0;
985
986 if (!di->i_xattr_loc)
987 return ret;
988
989 ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
990 &blk_bh);
991 if (ret < 0) {
992 mlog_errno(ret);
993 return ret;
994 }
995
996 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
997 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
998 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
999 ret = ocfs2_xattr_list_entries(inode, header,
1000 buffer, buffer_size);
1001 } else
1002 ret = ocfs2_xattr_tree_list_index_block(inode, blk_bh,
1003 buffer, buffer_size);
1004
1005 brelse(blk_bh);
1006
1007 return ret;
1008 }
1009
1010 ssize_t ocfs2_listxattr(struct dentry *dentry,
1011 char *buffer,
1012 size_t size)
1013 {
1014 int ret = 0, i_ret = 0, b_ret = 0;
1015 struct buffer_head *di_bh = NULL;
1016 struct ocfs2_dinode *di = NULL;
1017 struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode);
1018
1019 if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
1020 return -EOPNOTSUPP;
1021
1022 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1023 return ret;
1024
1025 ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0);
1026 if (ret < 0) {
1027 mlog_errno(ret);
1028 return ret;
1029 }
1030
1031 di = (struct ocfs2_dinode *)di_bh->b_data;
1032
1033 down_read(&oi->ip_xattr_sem);
1034 i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size);
1035 if (i_ret < 0)
1036 b_ret = 0;
1037 else {
1038 if (buffer) {
1039 buffer += i_ret;
1040 size -= i_ret;
1041 }
1042 b_ret = ocfs2_xattr_block_list(dentry->d_inode, di,
1043 buffer, size);
1044 if (b_ret < 0)
1045 i_ret = 0;
1046 }
1047 up_read(&oi->ip_xattr_sem);
1048 ocfs2_inode_unlock(dentry->d_inode, 0);
1049
1050 brelse(di_bh);
1051
1052 return i_ret + b_ret;
1053 }
1054
1055 static int ocfs2_xattr_find_entry(int name_index,
1056 const char *name,
1057 struct ocfs2_xattr_search *xs)
1058 {
1059 struct ocfs2_xattr_entry *entry;
1060 size_t name_len;
1061 int i, cmp = 1;
1062
1063 if (name == NULL)
1064 return -EINVAL;
1065
1066 name_len = strlen(name);
1067 entry = xs->here;
1068 for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
1069 cmp = name_index - ocfs2_xattr_get_type(entry);
1070 if (!cmp)
1071 cmp = name_len - entry->xe_name_len;
1072 if (!cmp)
1073 cmp = memcmp(name, (xs->base +
1074 le16_to_cpu(entry->xe_name_offset)),
1075 name_len);
1076 if (cmp == 0)
1077 break;
1078 entry += 1;
1079 }
1080 xs->here = entry;
1081
1082 return cmp ? -ENODATA : 0;
1083 }
1084
1085 static int ocfs2_xattr_get_value_outside(struct inode *inode,
1086 struct ocfs2_xattr_value_root *xv,
1087 void *buffer,
1088 size_t len)
1089 {
1090 u32 cpos, p_cluster, num_clusters, bpc, clusters;
1091 u64 blkno;
1092 int i, ret = 0;
1093 size_t cplen, blocksize;
1094 struct buffer_head *bh = NULL;
1095 struct ocfs2_extent_list *el;
1096
1097 el = &xv->xr_list;
1098 clusters = le32_to_cpu(xv->xr_clusters);
1099 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1100 blocksize = inode->i_sb->s_blocksize;
1101
1102 cpos = 0;
1103 while (cpos < clusters) {
1104 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
1105 &num_clusters, el, NULL);
1106 if (ret) {
1107 mlog_errno(ret);
1108 goto out;
1109 }
1110
1111 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
1112 /* Copy ocfs2_xattr_value */
1113 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1114 ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
1115 &bh, NULL);
1116 if (ret) {
1117 mlog_errno(ret);
1118 goto out;
1119 }
1120
1121 cplen = len >= blocksize ? blocksize : len;
1122 memcpy(buffer, bh->b_data, cplen);
1123 len -= cplen;
1124 buffer += cplen;
1125
1126 brelse(bh);
1127 bh = NULL;
1128 if (len == 0)
1129 break;
1130 }
1131 cpos += num_clusters;
1132 }
1133 out:
1134 return ret;
1135 }
1136
1137 static int ocfs2_xattr_ibody_get(struct inode *inode,
1138 int name_index,
1139 const char *name,
1140 void *buffer,
1141 size_t buffer_size,
1142 struct ocfs2_xattr_search *xs)
1143 {
1144 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1145 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1146 struct ocfs2_xattr_value_root *xv;
1147 size_t size;
1148 int ret = 0;
1149
1150 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
1151 return -ENODATA;
1152
1153 xs->end = (void *)di + inode->i_sb->s_blocksize;
1154 xs->header = (struct ocfs2_xattr_header *)
1155 (xs->end - le16_to_cpu(di->i_xattr_inline_size));
1156 xs->base = (void *)xs->header;
1157 xs->here = xs->header->xh_entries;
1158
1159 ret = ocfs2_xattr_find_entry(name_index, name, xs);
1160 if (ret)
1161 return ret;
1162 size = le64_to_cpu(xs->here->xe_value_size);
1163 if (buffer) {
1164 if (size > buffer_size)
1165 return -ERANGE;
1166 if (ocfs2_xattr_is_local(xs->here)) {
1167 memcpy(buffer, (void *)xs->base +
1168 le16_to_cpu(xs->here->xe_name_offset) +
1169 OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
1170 } else {
1171 xv = (struct ocfs2_xattr_value_root *)
1172 (xs->base + le16_to_cpu(
1173 xs->here->xe_name_offset) +
1174 OCFS2_XATTR_SIZE(xs->here->xe_name_len));
1175 ret = ocfs2_xattr_get_value_outside(inode, xv,
1176 buffer, size);
1177 if (ret < 0) {
1178 mlog_errno(ret);
1179 return ret;
1180 }
1181 }
1182 }
1183
1184 return size;
1185 }
1186
1187 static int ocfs2_xattr_block_get(struct inode *inode,
1188 int name_index,
1189 const char *name,
1190 void *buffer,
1191 size_t buffer_size,
1192 struct ocfs2_xattr_search *xs)
1193 {
1194 struct ocfs2_xattr_block *xb;
1195 struct ocfs2_xattr_value_root *xv;
1196 size_t size;
1197 int ret = -ENODATA, name_offset, name_len, i;
1198 int uninitialized_var(block_off);
1199
1200 xs->bucket = ocfs2_xattr_bucket_new(inode);
1201 if (!xs->bucket) {
1202 ret = -ENOMEM;
1203 mlog_errno(ret);
1204 goto cleanup;
1205 }
1206
1207 ret = ocfs2_xattr_block_find(inode, name_index, name, xs);
1208 if (ret) {
1209 mlog_errno(ret);
1210 goto cleanup;
1211 }
1212
1213 if (xs->not_found) {
1214 ret = -ENODATA;
1215 goto cleanup;
1216 }
1217
1218 xb = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1219 size = le64_to_cpu(xs->here->xe_value_size);
1220 if (buffer) {
1221 ret = -ERANGE;
1222 if (size > buffer_size)
1223 goto cleanup;
1224
1225 name_offset = le16_to_cpu(xs->here->xe_name_offset);
1226 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
1227 i = xs->here - xs->header->xh_entries;
1228
1229 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
1230 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
1231 bucket_xh(xs->bucket),
1232 i,
1233 &block_off,
1234 &name_offset);
1235 xs->base = bucket_block(xs->bucket, block_off);
1236 }
1237 if (ocfs2_xattr_is_local(xs->here)) {
1238 memcpy(buffer, (void *)xs->base +
1239 name_offset + name_len, size);
1240 } else {
1241 xv = (struct ocfs2_xattr_value_root *)
1242 (xs->base + name_offset + name_len);
1243 ret = ocfs2_xattr_get_value_outside(inode, xv,
1244 buffer, size);
1245 if (ret < 0) {
1246 mlog_errno(ret);
1247 goto cleanup;
1248 }
1249 }
1250 }
1251 ret = size;
1252 cleanup:
1253 ocfs2_xattr_bucket_free(xs->bucket);
1254
1255 brelse(xs->xattr_bh);
1256 xs->xattr_bh = NULL;
1257 return ret;
1258 }
1259
1260 int ocfs2_xattr_get_nolock(struct inode *inode,
1261 struct buffer_head *di_bh,
1262 int name_index,
1263 const char *name,
1264 void *buffer,
1265 size_t buffer_size)
1266 {
1267 int ret;
1268 struct ocfs2_dinode *di = NULL;
1269 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1270 struct ocfs2_xattr_search xis = {
1271 .not_found = -ENODATA,
1272 };
1273 struct ocfs2_xattr_search xbs = {
1274 .not_found = -ENODATA,
1275 };
1276
1277 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1278 return -EOPNOTSUPP;
1279
1280 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1281 ret = -ENODATA;
1282
1283 xis.inode_bh = xbs.inode_bh = di_bh;
1284 di = (struct ocfs2_dinode *)di_bh->b_data;
1285
1286 ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
1287 buffer_size, &xis);
1288 if (ret == -ENODATA && di->i_xattr_loc)
1289 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
1290 buffer_size, &xbs);
1291
1292 return ret;
1293 }
1294
1295 /* ocfs2_xattr_get()
1296 *
1297 * Copy an extended attribute into the buffer provided.
1298 * Buffer is NULL to compute the size of buffer required.
1299 */
1300 static int ocfs2_xattr_get(struct inode *inode,
1301 int name_index,
1302 const char *name,
1303 void *buffer,
1304 size_t buffer_size)
1305 {
1306 int ret;
1307 struct buffer_head *di_bh = NULL;
1308
1309 ret = ocfs2_inode_lock(inode, &di_bh, 0);
1310 if (ret < 0) {
1311 mlog_errno(ret);
1312 return ret;
1313 }
1314 down_read(&OCFS2_I(inode)->ip_xattr_sem);
1315 ret = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
1316 name, buffer, buffer_size);
1317 up_read(&OCFS2_I(inode)->ip_xattr_sem);
1318
1319 ocfs2_inode_unlock(inode, 0);
1320
1321 brelse(di_bh);
1322
1323 return ret;
1324 }
1325
1326 static int __ocfs2_xattr_set_value_outside(struct inode *inode,
1327 handle_t *handle,
1328 struct ocfs2_xattr_value_buf *vb,
1329 const void *value,
1330 int value_len)
1331 {
1332 int ret = 0, i, cp_len;
1333 u16 blocksize = inode->i_sb->s_blocksize;
1334 u32 p_cluster, num_clusters;
1335 u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1336 u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
1337 u64 blkno;
1338 struct buffer_head *bh = NULL;
1339 unsigned int ext_flags;
1340 struct ocfs2_xattr_value_root *xv = vb->vb_xv;
1341
1342 BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
1343
1344 while (cpos < clusters) {
1345 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
1346 &num_clusters, &xv->xr_list,
1347 &ext_flags);
1348 if (ret) {
1349 mlog_errno(ret);
1350 goto out;
1351 }
1352
1353 BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
1354
1355 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
1356
1357 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1358 ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
1359 &bh, NULL);
1360 if (ret) {
1361 mlog_errno(ret);
1362 goto out;
1363 }
1364
1365 ret = ocfs2_journal_access(handle,
1366 INODE_CACHE(inode),
1367 bh,
1368 OCFS2_JOURNAL_ACCESS_WRITE);
1369 if (ret < 0) {
1370 mlog_errno(ret);
1371 goto out;
1372 }
1373
1374 cp_len = value_len > blocksize ? blocksize : value_len;
1375 memcpy(bh->b_data, value, cp_len);
1376 value_len -= cp_len;
1377 value += cp_len;
1378 if (cp_len < blocksize)
1379 memset(bh->b_data + cp_len, 0,
1380 blocksize - cp_len);
1381
1382 ocfs2_journal_dirty(handle, bh);
1383 brelse(bh);
1384 bh = NULL;
1385
1386 /*
1387 * XXX: do we need to empty all the following
1388 * blocks in this cluster?
1389 */
1390 if (!value_len)
1391 break;
1392 }
1393 cpos += num_clusters;
1394 }
1395 out:
1396 brelse(bh);
1397
1398 return ret;
1399 }
1400
1401 static int ocfs2_xa_check_space_helper(int needed_space, int free_start,
1402 int num_entries)
1403 {
1404 int free_space;
1405
1406 if (!needed_space)
1407 return 0;
1408
1409 free_space = free_start -
1410 sizeof(struct ocfs2_xattr_header) -
1411 (num_entries * sizeof(struct ocfs2_xattr_entry)) -
1412 OCFS2_XATTR_HEADER_GAP;
1413 if (free_space < 0)
1414 return -EIO;
1415 if (free_space < needed_space)
1416 return -ENOSPC;
1417
1418 return 0;
1419 }
1420
1421 static int ocfs2_xa_journal_access(handle_t *handle, struct ocfs2_xa_loc *loc,
1422 int type)
1423 {
1424 return loc->xl_ops->xlo_journal_access(handle, loc, type);
1425 }
1426
1427 static void ocfs2_xa_journal_dirty(handle_t *handle, struct ocfs2_xa_loc *loc)
1428 {
1429 loc->xl_ops->xlo_journal_dirty(handle, loc);
1430 }
1431
1432 /* Give a pointer into the storage for the given offset */
1433 static void *ocfs2_xa_offset_pointer(struct ocfs2_xa_loc *loc, int offset)
1434 {
1435 BUG_ON(offset >= loc->xl_size);
1436 return loc->xl_ops->xlo_offset_pointer(loc, offset);
1437 }
1438
1439 /*
1440 * Wipe the name+value pair and allow the storage to reclaim it. This
1441 * must be followed by either removal of the entry or a call to
1442 * ocfs2_xa_add_namevalue().
1443 */
1444 static void ocfs2_xa_wipe_namevalue(struct ocfs2_xa_loc *loc)
1445 {
1446 loc->xl_ops->xlo_wipe_namevalue(loc);
1447 }
1448
1449 /*
1450 * Find lowest offset to a name+value pair. This is the start of our
1451 * downward-growing free space.
1452 */
1453 static int ocfs2_xa_get_free_start(struct ocfs2_xa_loc *loc)
1454 {
1455 return loc->xl_ops->xlo_get_free_start(loc);
1456 }
1457
1458 /* Can we reuse loc->xl_entry for xi? */
1459 static int ocfs2_xa_can_reuse_entry(struct ocfs2_xa_loc *loc,
1460 struct ocfs2_xattr_info *xi)
1461 {
1462 return loc->xl_ops->xlo_can_reuse(loc, xi);
1463 }
1464
1465 /* How much free space is needed to set the new value */
1466 static int ocfs2_xa_check_space(struct ocfs2_xa_loc *loc,
1467 struct ocfs2_xattr_info *xi)
1468 {
1469 return loc->xl_ops->xlo_check_space(loc, xi);
1470 }
1471
1472 static void ocfs2_xa_add_entry(struct ocfs2_xa_loc *loc, u32 name_hash)
1473 {
1474 loc->xl_ops->xlo_add_entry(loc, name_hash);
1475 loc->xl_entry->xe_name_hash = cpu_to_le32(name_hash);
1476 /*
1477 * We can't leave the new entry's xe_name_offset at zero or
1478 * add_namevalue() will go nuts. We set it to the size of our
1479 * storage so that it can never be less than any other entry.
1480 */
1481 loc->xl_entry->xe_name_offset = cpu_to_le16(loc->xl_size);
1482 }
1483
1484 static void ocfs2_xa_add_namevalue(struct ocfs2_xa_loc *loc,
1485 struct ocfs2_xattr_info *xi)
1486 {
1487 int size = namevalue_size_xi(xi);
1488 int nameval_offset;
1489 char *nameval_buf;
1490
1491 loc->xl_ops->xlo_add_namevalue(loc, size);
1492 loc->xl_entry->xe_value_size = cpu_to_le64(xi->xi_value_len);
1493 loc->xl_entry->xe_name_len = xi->xi_name_len;
1494 ocfs2_xattr_set_type(loc->xl_entry, xi->xi_name_index);
1495 ocfs2_xattr_set_local(loc->xl_entry,
1496 xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE);
1497
1498 nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1499 nameval_buf = ocfs2_xa_offset_pointer(loc, nameval_offset);
1500 memset(nameval_buf, 0, size);
1501 memcpy(nameval_buf, xi->xi_name, xi->xi_name_len);
1502 }
1503
1504 static void ocfs2_xa_fill_value_buf(struct ocfs2_xa_loc *loc,
1505 struct ocfs2_xattr_value_buf *vb)
1506 {
1507 int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1508 int name_size = OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len);
1509
1510 /* Value bufs are for value trees */
1511 BUG_ON(ocfs2_xattr_is_local(loc->xl_entry));
1512 BUG_ON(namevalue_size_xe(loc->xl_entry) !=
1513 (name_size + OCFS2_XATTR_ROOT_SIZE));
1514
1515 loc->xl_ops->xlo_fill_value_buf(loc, vb);
1516 vb->vb_xv =
1517 (struct ocfs2_xattr_value_root *)ocfs2_xa_offset_pointer(loc,
1518 nameval_offset +
1519 name_size);
1520 }
1521
1522 static int ocfs2_xa_block_journal_access(handle_t *handle,
1523 struct ocfs2_xa_loc *loc, int type)
1524 {
1525 struct buffer_head *bh = loc->xl_storage;
1526 ocfs2_journal_access_func access;
1527
1528 if (loc->xl_size == (bh->b_size -
1529 offsetof(struct ocfs2_xattr_block,
1530 xb_attrs.xb_header)))
1531 access = ocfs2_journal_access_xb;
1532 else
1533 access = ocfs2_journal_access_di;
1534 return access(handle, INODE_CACHE(loc->xl_inode), bh, type);
1535 }
1536
1537 static void ocfs2_xa_block_journal_dirty(handle_t *handle,
1538 struct ocfs2_xa_loc *loc)
1539 {
1540 struct buffer_head *bh = loc->xl_storage;
1541
1542 ocfs2_journal_dirty(handle, bh);
1543 }
1544
1545 static void *ocfs2_xa_block_offset_pointer(struct ocfs2_xa_loc *loc,
1546 int offset)
1547 {
1548 return (char *)loc->xl_header + offset;
1549 }
1550
1551 static int ocfs2_xa_block_can_reuse(struct ocfs2_xa_loc *loc,
1552 struct ocfs2_xattr_info *xi)
1553 {
1554 /*
1555 * Block storage is strict. If the sizes aren't exact, we will
1556 * remove the old one and reinsert the new.
1557 */
1558 return namevalue_size_xe(loc->xl_entry) ==
1559 namevalue_size_xi(xi);
1560 }
1561
1562 static int ocfs2_xa_block_get_free_start(struct ocfs2_xa_loc *loc)
1563 {
1564 struct ocfs2_xattr_header *xh = loc->xl_header;
1565 int i, count = le16_to_cpu(xh->xh_count);
1566 int offset, free_start = loc->xl_size;
1567
1568 for (i = 0; i < count; i++) {
1569 offset = le16_to_cpu(xh->xh_entries[i].xe_name_offset);
1570 if (offset < free_start)
1571 free_start = offset;
1572 }
1573
1574 return free_start;
1575 }
1576
1577 static int ocfs2_xa_block_check_space(struct ocfs2_xa_loc *loc,
1578 struct ocfs2_xattr_info *xi)
1579 {
1580 int count = le16_to_cpu(loc->xl_header->xh_count);
1581 int free_start = ocfs2_xa_get_free_start(loc);
1582 int needed_space = ocfs2_xi_entry_usage(xi);
1583
1584 /*
1585 * Block storage will reclaim the original entry before inserting
1586 * the new value, so we only need the difference. If the new
1587 * entry is smaller than the old one, we don't need anything.
1588 */
1589 if (loc->xl_entry) {
1590 /* Don't need space if we're reusing! */
1591 if (ocfs2_xa_can_reuse_entry(loc, xi))
1592 needed_space = 0;
1593 else
1594 needed_space -= ocfs2_xe_entry_usage(loc->xl_entry);
1595 }
1596 if (needed_space < 0)
1597 needed_space = 0;
1598 return ocfs2_xa_check_space_helper(needed_space, free_start, count);
1599 }
1600
1601 /*
1602 * Block storage for xattrs keeps the name+value pairs compacted. When
1603 * we remove one, we have to shift any that preceded it towards the end.
1604 */
1605 static void ocfs2_xa_block_wipe_namevalue(struct ocfs2_xa_loc *loc)
1606 {
1607 int i, offset;
1608 int namevalue_offset, first_namevalue_offset, namevalue_size;
1609 struct ocfs2_xattr_entry *entry = loc->xl_entry;
1610 struct ocfs2_xattr_header *xh = loc->xl_header;
1611 int count = le16_to_cpu(xh->xh_count);
1612
1613 namevalue_offset = le16_to_cpu(entry->xe_name_offset);
1614 namevalue_size = namevalue_size_xe(entry);
1615 first_namevalue_offset = ocfs2_xa_get_free_start(loc);
1616
1617 /* Shift the name+value pairs */
1618 memmove((char *)xh + first_namevalue_offset + namevalue_size,
1619 (char *)xh + first_namevalue_offset,
1620 namevalue_offset - first_namevalue_offset);
1621 memset((char *)xh + first_namevalue_offset, 0, namevalue_size);
1622
1623 /* Now tell xh->xh_entries about it */
1624 for (i = 0; i < count; i++) {
1625 offset = le16_to_cpu(xh->xh_entries[i].xe_name_offset);
1626 if (offset <= namevalue_offset)
1627 le16_add_cpu(&xh->xh_entries[i].xe_name_offset,
1628 namevalue_size);
1629 }
1630
1631 /*
1632 * Note that we don't update xh_free_start or xh_name_value_len
1633 * because they're not used in block-stored xattrs.
1634 */
1635 }
1636
1637 static void ocfs2_xa_block_add_entry(struct ocfs2_xa_loc *loc, u32 name_hash)
1638 {
1639 int count = le16_to_cpu(loc->xl_header->xh_count);
1640 loc->xl_entry = &(loc->xl_header->xh_entries[count]);
1641 le16_add_cpu(&loc->xl_header->xh_count, 1);
1642 memset(loc->xl_entry, 0, sizeof(struct ocfs2_xattr_entry));
1643 }
1644
1645 static void ocfs2_xa_block_add_namevalue(struct ocfs2_xa_loc *loc, int size)
1646 {
1647 int free_start = ocfs2_xa_get_free_start(loc);
1648
1649 loc->xl_entry->xe_name_offset = cpu_to_le16(free_start - size);
1650 }
1651
1652 static void ocfs2_xa_block_fill_value_buf(struct ocfs2_xa_loc *loc,
1653 struct ocfs2_xattr_value_buf *vb)
1654 {
1655 struct buffer_head *bh = loc->xl_storage;
1656
1657 if (loc->xl_size == (bh->b_size -
1658 offsetof(struct ocfs2_xattr_block,
1659 xb_attrs.xb_header)))
1660 vb->vb_access = ocfs2_journal_access_xb;
1661 else
1662 vb->vb_access = ocfs2_journal_access_di;
1663 vb->vb_bh = bh;
1664 }
1665
1666 /*
1667 * Operations for xattrs stored in blocks. This includes inline inode
1668 * storage and unindexed ocfs2_xattr_blocks.
1669 */
1670 static const struct ocfs2_xa_loc_operations ocfs2_xa_block_loc_ops = {
1671 .xlo_journal_access = ocfs2_xa_block_journal_access,
1672 .xlo_journal_dirty = ocfs2_xa_block_journal_dirty,
1673 .xlo_offset_pointer = ocfs2_xa_block_offset_pointer,
1674 .xlo_check_space = ocfs2_xa_block_check_space,
1675 .xlo_can_reuse = ocfs2_xa_block_can_reuse,
1676 .xlo_get_free_start = ocfs2_xa_block_get_free_start,
1677 .xlo_wipe_namevalue = ocfs2_xa_block_wipe_namevalue,
1678 .xlo_add_entry = ocfs2_xa_block_add_entry,
1679 .xlo_add_namevalue = ocfs2_xa_block_add_namevalue,
1680 .xlo_fill_value_buf = ocfs2_xa_block_fill_value_buf,
1681 };
1682
1683 static int ocfs2_xa_bucket_journal_access(handle_t *handle,
1684 struct ocfs2_xa_loc *loc, int type)
1685 {
1686 struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1687
1688 return ocfs2_xattr_bucket_journal_access(handle, bucket, type);
1689 }
1690
1691 static void ocfs2_xa_bucket_journal_dirty(handle_t *handle,
1692 struct ocfs2_xa_loc *loc)
1693 {
1694 struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1695
1696 ocfs2_xattr_bucket_journal_dirty(handle, bucket);
1697 }
1698
1699 static void *ocfs2_xa_bucket_offset_pointer(struct ocfs2_xa_loc *loc,
1700 int offset)
1701 {
1702 struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1703 int block, block_offset;
1704
1705 /* The header is at the front of the bucket */
1706 block = offset >> loc->xl_inode->i_sb->s_blocksize_bits;
1707 block_offset = offset % loc->xl_inode->i_sb->s_blocksize;
1708
1709 return bucket_block(bucket, block) + block_offset;
1710 }
1711
1712 static int ocfs2_xa_bucket_can_reuse(struct ocfs2_xa_loc *loc,
1713 struct ocfs2_xattr_info *xi)
1714 {
1715 return namevalue_size_xe(loc->xl_entry) >=
1716 namevalue_size_xi(xi);
1717 }
1718
1719 static int ocfs2_xa_bucket_get_free_start(struct ocfs2_xa_loc *loc)
1720 {
1721 struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1722 return le16_to_cpu(bucket_xh(bucket)->xh_free_start);
1723 }
1724
1725 static int ocfs2_bucket_align_free_start(struct super_block *sb,
1726 int free_start, int size)
1727 {
1728 /*
1729 * We need to make sure that the name+value pair fits within
1730 * one block.
1731 */
1732 if (((free_start - size) >> sb->s_blocksize_bits) !=
1733 ((free_start - 1) >> sb->s_blocksize_bits))
1734 free_start -= free_start % sb->s_blocksize;
1735
1736 return free_start;
1737 }
1738
1739 static int ocfs2_xa_bucket_check_space(struct ocfs2_xa_loc *loc,
1740 struct ocfs2_xattr_info *xi)
1741 {
1742 int rc;
1743 int count = le16_to_cpu(loc->xl_header->xh_count);
1744 int free_start = ocfs2_xa_get_free_start(loc);
1745 int needed_space = ocfs2_xi_entry_usage(xi);
1746 int size = namevalue_size_xi(xi);
1747 struct super_block *sb = loc->xl_inode->i_sb;
1748
1749 /*
1750 * Bucket storage does not reclaim name+value pairs it cannot
1751 * reuse. They live as holes until the bucket fills, and then
1752 * the bucket is defragmented. However, the bucket can reclaim
1753 * the ocfs2_xattr_entry.
1754 */
1755 if (loc->xl_entry) {
1756 /* Don't need space if we're reusing! */
1757 if (ocfs2_xa_can_reuse_entry(loc, xi))
1758 needed_space = 0;
1759 else
1760 needed_space -= sizeof(struct ocfs2_xattr_entry);
1761 }
1762 BUG_ON(needed_space < 0);
1763
1764 if (free_start < size) {
1765 if (needed_space)
1766 return -ENOSPC;
1767 } else {
1768 /*
1769 * First we check if it would fit in the first place.
1770 * Below, we align the free start to a block. This may
1771 * slide us below the minimum gap. By checking unaligned
1772 * first, we avoid that error.
1773 */
1774 rc = ocfs2_xa_check_space_helper(needed_space, free_start,
1775 count);
1776 if (rc)
1777 return rc;
1778 free_start = ocfs2_bucket_align_free_start(sb, free_start,
1779 size);
1780 }
1781 return ocfs2_xa_check_space_helper(needed_space, free_start, count);
1782 }
1783
1784 static void ocfs2_xa_bucket_wipe_namevalue(struct ocfs2_xa_loc *loc)
1785 {
1786 le16_add_cpu(&loc->xl_header->xh_name_value_len,
1787 -namevalue_size_xe(loc->xl_entry));
1788 }
1789
1790 static void ocfs2_xa_bucket_add_entry(struct ocfs2_xa_loc *loc, u32 name_hash)
1791 {
1792 struct ocfs2_xattr_header *xh = loc->xl_header;
1793 int count = le16_to_cpu(xh->xh_count);
1794 int low = 0, high = count - 1, tmp;
1795 struct ocfs2_xattr_entry *tmp_xe;
1796
1797 /*
1798 * We keep buckets sorted by name_hash, so we need to find
1799 * our insert place.
1800 */
1801 while (low <= high && count) {
1802 tmp = (low + high) / 2;
1803 tmp_xe = &xh->xh_entries[tmp];
1804
1805 if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
1806 low = tmp + 1;
1807 else if (name_hash < le32_to_cpu(tmp_xe->xe_name_hash))
1808 high = tmp - 1;
1809 else {
1810 low = tmp;
1811 break;
1812 }
1813 }
1814
1815 if (low != count)
1816 memmove(&xh->xh_entries[low + 1],
1817 &xh->xh_entries[low],
1818 ((count - low) * sizeof(struct ocfs2_xattr_entry)));
1819
1820 le16_add_cpu(&xh->xh_count, 1);
1821 loc->xl_entry = &xh->xh_entries[low];
1822 memset(loc->xl_entry, 0, sizeof(struct ocfs2_xattr_entry));
1823 }
1824
1825 static void ocfs2_xa_bucket_add_namevalue(struct ocfs2_xa_loc *loc, int size)
1826 {
1827 int free_start = ocfs2_xa_get_free_start(loc);
1828 struct ocfs2_xattr_header *xh = loc->xl_header;
1829 struct super_block *sb = loc->xl_inode->i_sb;
1830 int nameval_offset;
1831
1832 free_start = ocfs2_bucket_align_free_start(sb, free_start, size);
1833 nameval_offset = free_start - size;
1834 loc->xl_entry->xe_name_offset = cpu_to_le16(nameval_offset);
1835 xh->xh_free_start = cpu_to_le16(nameval_offset);
1836 le16_add_cpu(&xh->xh_name_value_len, size);
1837
1838 }
1839
1840 static void ocfs2_xa_bucket_fill_value_buf(struct ocfs2_xa_loc *loc,
1841 struct ocfs2_xattr_value_buf *vb)
1842 {
1843 struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1844 struct super_block *sb = loc->xl_inode->i_sb;
1845 int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1846 int size = namevalue_size_xe(loc->xl_entry);
1847 int block_offset = nameval_offset >> sb->s_blocksize_bits;
1848
1849 /* Values are not allowed to straddle block boundaries */
1850 BUG_ON(block_offset !=
1851 ((nameval_offset + size - 1) >> sb->s_blocksize_bits));
1852 /* We expect the bucket to be filled in */
1853 BUG_ON(!bucket->bu_bhs[block_offset]);
1854
1855 vb->vb_access = ocfs2_journal_access;
1856 vb->vb_bh = bucket->bu_bhs[block_offset];
1857 }
1858
1859 /* Operations for xattrs stored in buckets. */
1860 static const struct ocfs2_xa_loc_operations ocfs2_xa_bucket_loc_ops = {
1861 .xlo_journal_access = ocfs2_xa_bucket_journal_access,
1862 .xlo_journal_dirty = ocfs2_xa_bucket_journal_dirty,
1863 .xlo_offset_pointer = ocfs2_xa_bucket_offset_pointer,
1864 .xlo_check_space = ocfs2_xa_bucket_check_space,
1865 .xlo_can_reuse = ocfs2_xa_bucket_can_reuse,
1866 .xlo_get_free_start = ocfs2_xa_bucket_get_free_start,
1867 .xlo_wipe_namevalue = ocfs2_xa_bucket_wipe_namevalue,
1868 .xlo_add_entry = ocfs2_xa_bucket_add_entry,
1869 .xlo_add_namevalue = ocfs2_xa_bucket_add_namevalue,
1870 .xlo_fill_value_buf = ocfs2_xa_bucket_fill_value_buf,
1871 };
1872
1873 static unsigned int ocfs2_xa_value_clusters(struct ocfs2_xa_loc *loc)
1874 {
1875 struct ocfs2_xattr_value_buf vb;
1876
1877 if (ocfs2_xattr_is_local(loc->xl_entry))
1878 return 0;
1879
1880 ocfs2_xa_fill_value_buf(loc, &vb);
1881 return le32_to_cpu(vb.vb_xv->xr_clusters);
1882 }
1883
1884 static int ocfs2_xa_value_truncate(struct ocfs2_xa_loc *loc, u64 bytes,
1885 struct ocfs2_xattr_set_ctxt *ctxt)
1886 {
1887 int trunc_rc, access_rc;
1888 struct ocfs2_xattr_value_buf vb;
1889
1890 ocfs2_xa_fill_value_buf(loc, &vb);
1891 trunc_rc = ocfs2_xattr_value_truncate(loc->xl_inode, &vb, bytes,
1892 ctxt);
1893
1894 /*
1895 * The caller of ocfs2_xa_value_truncate() has already called
1896 * ocfs2_xa_journal_access on the loc. However, The truncate code
1897 * calls ocfs2_extend_trans(). This may commit the previous
1898 * transaction and open a new one. If this is a bucket, truncate
1899 * could leave only vb->vb_bh set up for journaling. Meanwhile,
1900 * the caller is expecting to dirty the entire bucket. So we must
1901 * reset the journal work. We do this even if truncate has failed,
1902 * as it could have failed after committing the extend.
1903 */
1904 access_rc = ocfs2_xa_journal_access(ctxt->handle, loc,
1905 OCFS2_JOURNAL_ACCESS_WRITE);
1906
1907 /* Errors in truncate take precedence */
1908 return trunc_rc ? trunc_rc : access_rc;
1909 }
1910
1911 static void ocfs2_xa_remove_entry(struct ocfs2_xa_loc *loc)
1912 {
1913 int index, count;
1914 struct ocfs2_xattr_header *xh = loc->xl_header;
1915 struct ocfs2_xattr_entry *entry = loc->xl_entry;
1916
1917 ocfs2_xa_wipe_namevalue(loc);
1918 loc->xl_entry = NULL;
1919
1920 le16_add_cpu(&xh->xh_count, -1);
1921 count = le16_to_cpu(xh->xh_count);
1922
1923 /*
1924 * Only zero out the entry if there are more remaining. This is
1925 * important for an empty bucket, as it keeps track of the
1926 * bucket's hash value. It doesn't hurt empty block storage.
1927 */
1928 if (count) {
1929 index = ((char *)entry - (char *)&xh->xh_entries) /
1930 sizeof(struct ocfs2_xattr_entry);
1931 memmove(&xh->xh_entries[index], &xh->xh_entries[index + 1],
1932 (count - index) * sizeof(struct ocfs2_xattr_entry));
1933 memset(&xh->xh_entries[count], 0,
1934 sizeof(struct ocfs2_xattr_entry));
1935 }
1936 }
1937
1938 /*
1939 * If we have a problem adjusting the size of an external value during
1940 * ocfs2_xa_prepare_entry() or ocfs2_xa_remove(), we may have an xattr
1941 * in an intermediate state. For example, the value may be partially
1942 * truncated.
1943 *
1944 * If the value tree hasn't changed, the extend/truncate went nowhere.
1945 * We have nothing to do. The caller can treat it as a straight error.
1946 *
1947 * If the value tree got partially truncated, we now have a corrupted
1948 * extended attribute. We're going to wipe its entry and leak the
1949 * clusters. Better to leak some storage than leave a corrupt entry.
1950 *
1951 * If the value tree grew, it obviously didn't grow enough for the
1952 * new entry. We're not going to try and reclaim those clusters either.
1953 * If there was already an external value there (orig_clusters != 0),
1954 * the new clusters are attached safely and we can just leave the old
1955 * value in place. If there was no external value there, we remove
1956 * the entry.
1957 *
1958 * This way, the xattr block we store in the journal will be consistent.
1959 * If the size change broke because of the journal, no changes will hit
1960 * disk anyway.
1961 */
1962 static void ocfs2_xa_cleanup_value_truncate(struct ocfs2_xa_loc *loc,
1963 const char *what,
1964 unsigned int orig_clusters)
1965 {
1966 unsigned int new_clusters = ocfs2_xa_value_clusters(loc);
1967 char *nameval_buf = ocfs2_xa_offset_pointer(loc,
1968 le16_to_cpu(loc->xl_entry->xe_name_offset));
1969
1970 if (new_clusters < orig_clusters) {
1971 mlog(ML_ERROR,
1972 "Partial truncate while %s xattr %.*s. Leaking "
1973 "%u clusters and removing the entry\n",
1974 what, loc->xl_entry->xe_name_len, nameval_buf,
1975 orig_clusters - new_clusters);
1976 ocfs2_xa_remove_entry(loc);
1977 } else if (!orig_clusters) {
1978 mlog(ML_ERROR,
1979 "Unable to allocate an external value for xattr "
1980 "%.*s safely. Leaking %u clusters and removing the "
1981 "entry\n",
1982 loc->xl_entry->xe_name_len, nameval_buf,
1983 new_clusters - orig_clusters);
1984 ocfs2_xa_remove_entry(loc);
1985 } else if (new_clusters > orig_clusters)
1986 mlog(ML_ERROR,
1987 "Unable to grow xattr %.*s safely. %u new clusters "
1988 "have been added, but the value will not be "
1989 "modified\n",
1990 loc->xl_entry->xe_name_len, nameval_buf,
1991 new_clusters - orig_clusters);
1992 }
1993
1994 static int ocfs2_xa_remove(struct ocfs2_xa_loc *loc,
1995 struct ocfs2_xattr_set_ctxt *ctxt)
1996 {
1997 int rc = 0;
1998 unsigned int orig_clusters;
1999
2000 if (!ocfs2_xattr_is_local(loc->xl_entry)) {
2001 orig_clusters = ocfs2_xa_value_clusters(loc);
2002 rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2003 if (rc) {
2004 mlog_errno(rc);
2005 /*
2006 * Since this is remove, we can return 0 if
2007 * ocfs2_xa_cleanup_value_truncate() is going to
2008 * wipe the entry anyway. So we check the
2009 * cluster count as well.
2010 */
2011 if (orig_clusters != ocfs2_xa_value_clusters(loc))
2012 rc = 0;
2013 ocfs2_xa_cleanup_value_truncate(loc, "removing",
2014 orig_clusters);
2015 if (rc)
2016 goto out;
2017 }
2018 }
2019
2020 ocfs2_xa_remove_entry(loc);
2021
2022 out:
2023 return rc;
2024 }
2025
2026 static void ocfs2_xa_install_value_root(struct ocfs2_xa_loc *loc)
2027 {
2028 int name_size = OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len);
2029 char *nameval_buf;
2030
2031 nameval_buf = ocfs2_xa_offset_pointer(loc,
2032 le16_to_cpu(loc->xl_entry->xe_name_offset));
2033 memcpy(nameval_buf + name_size, &def_xv, OCFS2_XATTR_ROOT_SIZE);
2034 }
2035
2036 /*
2037 * Take an existing entry and make it ready for the new value. This
2038 * won't allocate space, but it may free space. It should be ready for
2039 * ocfs2_xa_prepare_entry() to finish the work.
2040 */
2041 static int ocfs2_xa_reuse_entry(struct ocfs2_xa_loc *loc,
2042 struct ocfs2_xattr_info *xi,
2043 struct ocfs2_xattr_set_ctxt *ctxt)
2044 {
2045 int rc = 0;
2046 int name_size = OCFS2_XATTR_SIZE(xi->xi_name_len);
2047 unsigned int orig_clusters;
2048 char *nameval_buf;
2049 int xe_local = ocfs2_xattr_is_local(loc->xl_entry);
2050 int xi_local = xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE;
2051
2052 BUG_ON(OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len) !=
2053 name_size);
2054
2055 nameval_buf = ocfs2_xa_offset_pointer(loc,
2056 le16_to_cpu(loc->xl_entry->xe_name_offset));
2057 if (xe_local) {
2058 memset(nameval_buf + name_size, 0,
2059 namevalue_size_xe(loc->xl_entry) - name_size);
2060 if (!xi_local)
2061 ocfs2_xa_install_value_root(loc);
2062 } else {
2063 orig_clusters = ocfs2_xa_value_clusters(loc);
2064 if (xi_local) {
2065 rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2066 if (rc < 0)
2067 mlog_errno(rc);
2068 else
2069 memset(nameval_buf + name_size, 0,
2070 namevalue_size_xe(loc->xl_entry) -
2071 name_size);
2072 } else if (le64_to_cpu(loc->xl_entry->xe_value_size) >
2073 xi->xi_value_len) {
2074 rc = ocfs2_xa_value_truncate(loc, xi->xi_value_len,
2075 ctxt);
2076 if (rc < 0)
2077 mlog_errno(rc);
2078 }
2079
2080 if (rc) {
2081 ocfs2_xa_cleanup_value_truncate(loc, "reusing",
2082 orig_clusters);
2083 goto out;
2084 }
2085 }
2086
2087 loc->xl_entry->xe_value_size = cpu_to_le64(xi->xi_value_len);
2088 ocfs2_xattr_set_local(loc->xl_entry, xi_local);
2089
2090 out:
2091 return rc;
2092 }
2093
2094 /*
2095 * Prepares loc->xl_entry to receive the new xattr. This includes
2096 * properly setting up the name+value pair region. If loc->xl_entry
2097 * already exists, it will take care of modifying it appropriately.
2098 *
2099 * Note that this modifies the data. You did journal_access already,
2100 * right?
2101 */
2102 static int ocfs2_xa_prepare_entry(struct ocfs2_xa_loc *loc,
2103 struct ocfs2_xattr_info *xi,
2104 u32 name_hash,
2105 struct ocfs2_xattr_set_ctxt *ctxt)
2106 {
2107 int rc = 0;
2108 unsigned int orig_clusters;
2109 __le64 orig_value_size = 0;
2110
2111 rc = ocfs2_xa_check_space(loc, xi);
2112 if (rc)
2113 goto out;
2114
2115 if (loc->xl_entry) {
2116 if (ocfs2_xa_can_reuse_entry(loc, xi)) {
2117 orig_value_size = loc->xl_entry->xe_value_size;
2118 rc = ocfs2_xa_reuse_entry(loc, xi, ctxt);
2119 if (rc)
2120 goto out;
2121 goto alloc_value;
2122 }
2123
2124 if (!ocfs2_xattr_is_local(loc->xl_entry)) {
2125 orig_clusters = ocfs2_xa_value_clusters(loc);
2126 rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2127 if (rc) {
2128 mlog_errno(rc);
2129 ocfs2_xa_cleanup_value_truncate(loc,
2130 "overwriting",
2131 orig_clusters);
2132 goto out;
2133 }
2134 }
2135 ocfs2_xa_wipe_namevalue(loc);
2136 } else
2137 ocfs2_xa_add_entry(loc, name_hash);
2138
2139 /*
2140 * If we get here, we have a blank entry. Fill it. We grow our
2141 * name+value pair back from the end.
2142 */
2143 ocfs2_xa_add_namevalue(loc, xi);
2144 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE)
2145 ocfs2_xa_install_value_root(loc);
2146
2147 alloc_value:
2148 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
2149 orig_clusters = ocfs2_xa_value_clusters(loc);
2150 rc = ocfs2_xa_value_truncate(loc, xi->xi_value_len, ctxt);
2151 if (rc < 0) {
2152 ctxt->set_abort = 1;
2153 ocfs2_xa_cleanup_value_truncate(loc, "growing",
2154 orig_clusters);
2155 /*
2156 * If we were growing an existing value,
2157 * ocfs2_xa_cleanup_value_truncate() won't remove
2158 * the entry. We need to restore the original value
2159 * size.
2160 */
2161 if (loc->xl_entry) {
2162 BUG_ON(!orig_value_size);
2163 loc->xl_entry->xe_value_size = orig_value_size;
2164 }
2165 mlog_errno(rc);
2166 }
2167 }
2168
2169 out:
2170 return rc;
2171 }
2172
2173 /*
2174 * Store the value portion of the name+value pair. This will skip
2175 * values that are stored externally. Their tree roots were set up
2176 * by ocfs2_xa_prepare_entry().
2177 */
2178 static int ocfs2_xa_store_value(struct ocfs2_xa_loc *loc,
2179 struct ocfs2_xattr_info *xi,
2180 struct ocfs2_xattr_set_ctxt *ctxt)
2181 {
2182 int rc = 0;
2183 int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
2184 int name_size = OCFS2_XATTR_SIZE(xi->xi_name_len);
2185 char *nameval_buf;
2186 struct ocfs2_xattr_value_buf vb;
2187
2188 nameval_buf = ocfs2_xa_offset_pointer(loc, nameval_offset);
2189 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
2190 ocfs2_xa_fill_value_buf(loc, &vb);
2191 rc = __ocfs2_xattr_set_value_outside(loc->xl_inode,
2192 ctxt->handle, &vb,
2193 xi->xi_value,
2194 xi->xi_value_len);
2195 } else
2196 memcpy(nameval_buf + name_size, xi->xi_value, xi->xi_value_len);
2197
2198 return rc;
2199 }
2200
2201 static int ocfs2_xa_set(struct ocfs2_xa_loc *loc,
2202 struct ocfs2_xattr_info *xi,
2203 struct ocfs2_xattr_set_ctxt *ctxt)
2204 {
2205 int ret;
2206 u32 name_hash = ocfs2_xattr_name_hash(loc->xl_inode, xi->xi_name,
2207 xi->xi_name_len);
2208
2209 ret = ocfs2_xa_journal_access(ctxt->handle, loc,
2210 OCFS2_JOURNAL_ACCESS_WRITE);
2211 if (ret) {
2212 mlog_errno(ret);
2213 goto out;
2214 }
2215
2216 /*
2217 * From here on out, everything is going to modify the buffer a
2218 * little. Errors are going to leave the xattr header in a
2219 * sane state. Thus, even with errors we dirty the sucker.
2220 */
2221
2222 /* Don't worry, we are never called with !xi_value and !xl_entry */
2223 if (!xi->xi_value) {
2224 ret = ocfs2_xa_remove(loc, ctxt);
2225 goto out_dirty;
2226 }
2227
2228 ret = ocfs2_xa_prepare_entry(loc, xi, name_hash, ctxt);
2229 if (ret) {
2230 if (ret != -ENOSPC)
2231 mlog_errno(ret);
2232 goto out_dirty;
2233 }
2234
2235 ret = ocfs2_xa_store_value(loc, xi, ctxt);
2236 if (ret)
2237 mlog_errno(ret);
2238
2239 out_dirty:
2240 ocfs2_xa_journal_dirty(ctxt->handle, loc);
2241
2242 out:
2243 return ret;
2244 }
2245
2246 static void ocfs2_init_dinode_xa_loc(struct ocfs2_xa_loc *loc,
2247 struct inode *inode,
2248 struct buffer_head *bh,
2249 struct ocfs2_xattr_entry *entry)
2250 {
2251 struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
2252
2253 BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_XATTR_FL));
2254
2255 loc->xl_inode = inode;
2256 loc->xl_ops = &ocfs2_xa_block_loc_ops;
2257 loc->xl_storage = bh;
2258 loc->xl_entry = entry;
2259 loc->xl_size = le16_to_cpu(di->i_xattr_inline_size);
2260 loc->xl_header =
2261 (struct ocfs2_xattr_header *)(bh->b_data + bh->b_size -
2262 loc->xl_size);
2263 }
2264
2265 static void ocfs2_init_xattr_block_xa_loc(struct ocfs2_xa_loc *loc,
2266 struct inode *inode,
2267 struct buffer_head *bh,
2268 struct ocfs2_xattr_entry *entry)
2269 {
2270 struct ocfs2_xattr_block *xb =
2271 (struct ocfs2_xattr_block *)bh->b_data;
2272
2273 BUG_ON(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED);
2274
2275 loc->xl_inode = inode;
2276 loc->xl_ops = &ocfs2_xa_block_loc_ops;
2277 loc->xl_storage = bh;
2278 loc->xl_header = &(xb->xb_attrs.xb_header);
2279 loc->xl_entry = entry;
2280 loc->xl_size = bh->b_size - offsetof(struct ocfs2_xattr_block,
2281 xb_attrs.xb_header);
2282 }
2283
2284 static void ocfs2_init_xattr_bucket_xa_loc(struct ocfs2_xa_loc *loc,
2285 struct ocfs2_xattr_bucket *bucket,
2286 struct ocfs2_xattr_entry *entry)
2287 {
2288 loc->xl_inode = bucket->bu_inode;
2289 loc->xl_ops = &ocfs2_xa_bucket_loc_ops;
2290 loc->xl_storage = bucket;
2291 loc->xl_header = bucket_xh(bucket);
2292 loc->xl_entry = entry;
2293 loc->xl_size = OCFS2_XATTR_BUCKET_SIZE;
2294 }
2295
2296 /*
2297 * In xattr remove, if it is stored outside and refcounted, we may have
2298 * the chance to split the refcount tree. So need the allocators.
2299 */
2300 static int ocfs2_lock_xattr_remove_allocators(struct inode *inode,
2301 struct ocfs2_xattr_value_root *xv,
2302 struct ocfs2_caching_info *ref_ci,
2303 struct buffer_head *ref_root_bh,
2304 struct ocfs2_alloc_context **meta_ac,
2305 int *ref_credits)
2306 {
2307 int ret, meta_add = 0;
2308 u32 p_cluster, num_clusters;
2309 unsigned int ext_flags;
2310
2311 *ref_credits = 0;
2312 ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
2313 &num_clusters,
2314 &xv->xr_list,
2315 &ext_flags);
2316 if (ret) {
2317 mlog_errno(ret);
2318 goto out;
2319 }
2320
2321 if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
2322 goto out;
2323
2324 ret = ocfs2_refcounted_xattr_delete_need(inode, ref_ci,
2325 ref_root_bh, xv,
2326 &meta_add, ref_credits);
2327 if (ret) {
2328 mlog_errno(ret);
2329 goto out;
2330 }
2331
2332 ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb),
2333 meta_add, meta_ac);
2334 if (ret)
2335 mlog_errno(ret);
2336
2337 out:
2338 return ret;
2339 }
2340
2341 static int ocfs2_remove_value_outside(struct inode*inode,
2342 struct ocfs2_xattr_value_buf *vb,
2343 struct ocfs2_xattr_header *header,
2344 struct ocfs2_caching_info *ref_ci,
2345 struct buffer_head *ref_root_bh)
2346 {
2347 int ret = 0, i, ref_credits;
2348 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2349 struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
2350 void *val;
2351
2352 ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
2353
2354 for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
2355 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
2356
2357 if (ocfs2_xattr_is_local(entry))
2358 continue;
2359
2360 val = (void *)header +
2361 le16_to_cpu(entry->xe_name_offset);
2362 vb->vb_xv = (struct ocfs2_xattr_value_root *)
2363 (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
2364
2365 ret = ocfs2_lock_xattr_remove_allocators(inode, vb->vb_xv,
2366 ref_ci, ref_root_bh,
2367 &ctxt.meta_ac,
2368 &ref_credits);
2369
2370 ctxt.handle = ocfs2_start_trans(osb, ref_credits +
2371 ocfs2_remove_extent_credits(osb->sb));
2372 if (IS_ERR(ctxt.handle)) {
2373 ret = PTR_ERR(ctxt.handle);
2374 mlog_errno(ret);
2375 break;
2376 }
2377
2378 ret = ocfs2_xattr_value_truncate(inode, vb, 0, &ctxt);
2379 if (ret < 0) {
2380 mlog_errno(ret);
2381 break;
2382 }
2383
2384 ocfs2_commit_trans(osb, ctxt.handle);
2385 if (ctxt.meta_ac) {
2386 ocfs2_free_alloc_context(ctxt.meta_ac);
2387 ctxt.meta_ac = NULL;
2388 }
2389 }
2390
2391 if (ctxt.meta_ac)
2392 ocfs2_free_alloc_context(ctxt.meta_ac);
2393 ocfs2_schedule_truncate_log_flush(osb, 1);
2394 ocfs2_run_deallocs(osb, &ctxt.dealloc);
2395 return ret;
2396 }
2397
2398 static int ocfs2_xattr_ibody_remove(struct inode *inode,
2399 struct buffer_head *di_bh,
2400 struct ocfs2_caching_info *ref_ci,
2401 struct buffer_head *ref_root_bh)
2402 {
2403
2404 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2405 struct ocfs2_xattr_header *header;
2406 int ret;
2407 struct ocfs2_xattr_value_buf vb = {
2408 .vb_bh = di_bh,
2409 .vb_access = ocfs2_journal_access_di,
2410 };
2411
2412 header = (struct ocfs2_xattr_header *)
2413 ((void *)di + inode->i_sb->s_blocksize -
2414 le16_to_cpu(di->i_xattr_inline_size));
2415
2416 ret = ocfs2_remove_value_outside(inode, &vb, header,
2417 ref_ci, ref_root_bh);
2418
2419 return ret;
2420 }
2421
2422 struct ocfs2_rm_xattr_bucket_para {
2423 struct ocfs2_caching_info *ref_ci;
2424 struct buffer_head *ref_root_bh;
2425 };
2426
2427 static int ocfs2_xattr_block_remove(struct inode *inode,
2428 struct buffer_head *blk_bh,
2429 struct ocfs2_caching_info *ref_ci,
2430 struct buffer_head *ref_root_bh)
2431 {
2432 struct ocfs2_xattr_block *xb;
2433 int ret = 0;
2434 struct ocfs2_xattr_value_buf vb = {
2435 .vb_bh = blk_bh,
2436 .vb_access = ocfs2_journal_access_xb,
2437 };
2438 struct ocfs2_rm_xattr_bucket_para args = {
2439 .ref_ci = ref_ci,
2440 .ref_root_bh = ref_root_bh,
2441 };
2442
2443 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2444 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2445 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
2446 ret = ocfs2_remove_value_outside(inode, &vb, header,
2447 ref_ci, ref_root_bh);
2448 } else
2449 ret = ocfs2_iterate_xattr_index_block(inode,
2450 blk_bh,
2451 ocfs2_rm_xattr_cluster,
2452 &args);
2453
2454 return ret;
2455 }
2456
2457 static int ocfs2_xattr_free_block(struct inode *inode,
2458 u64 block,
2459 struct ocfs2_caching_info *ref_ci,
2460 struct buffer_head *ref_root_bh)
2461 {
2462 struct inode *xb_alloc_inode;
2463 struct buffer_head *xb_alloc_bh = NULL;
2464 struct buffer_head *blk_bh = NULL;
2465 struct ocfs2_xattr_block *xb;
2466 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2467 handle_t *handle;
2468 int ret = 0;
2469 u64 blk, bg_blkno;
2470 u16 bit;
2471
2472 ret = ocfs2_read_xattr_block(inode, block, &blk_bh);
2473 if (ret < 0) {
2474 mlog_errno(ret);
2475 goto out;
2476 }
2477
2478 ret = ocfs2_xattr_block_remove(inode, blk_bh, ref_ci, ref_root_bh);
2479 if (ret < 0) {
2480 mlog_errno(ret);
2481 goto out;
2482 }
2483
2484 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2485 blk = le64_to_cpu(xb->xb_blkno);
2486 bit = le16_to_cpu(xb->xb_suballoc_bit);
2487 if (xb->xb_suballoc_loc)
2488 bg_blkno = le64_to_cpu(xb->xb_suballoc_loc);
2489 else
2490 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
2491
2492 xb_alloc_inode = ocfs2_get_system_file_inode(osb,
2493 EXTENT_ALLOC_SYSTEM_INODE,
2494 le16_to_cpu(xb->xb_suballoc_slot));
2495 if (!xb_alloc_inode) {
2496 ret = -ENOMEM;
2497 mlog_errno(ret);
2498 goto out;
2499 }
2500 mutex_lock(&xb_alloc_inode->i_mutex);
2501
2502 ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
2503 if (ret < 0) {
2504 mlog_errno(ret);
2505 goto out_mutex;
2506 }
2507
2508 handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
2509 if (IS_ERR(handle)) {
2510 ret = PTR_ERR(handle);
2511 mlog_errno(ret);
2512 goto out_unlock;
2513 }
2514
2515 ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
2516 bit, bg_blkno, 1);
2517 if (ret < 0)
2518 mlog_errno(ret);
2519
2520 ocfs2_commit_trans(osb, handle);
2521 out_unlock:
2522 ocfs2_inode_unlock(xb_alloc_inode, 1);
2523 brelse(xb_alloc_bh);
2524 out_mutex:
2525 mutex_unlock(&xb_alloc_inode->i_mutex);
2526 iput(xb_alloc_inode);
2527 out:
2528 brelse(blk_bh);
2529 return ret;
2530 }
2531
2532 /*
2533 * ocfs2_xattr_remove()
2534 *
2535 * Free extended attribute resources associated with this inode.
2536 */
2537 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
2538 {
2539 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2540 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2541 struct ocfs2_refcount_tree *ref_tree = NULL;
2542 struct buffer_head *ref_root_bh = NULL;
2543 struct ocfs2_caching_info *ref_ci = NULL;
2544 handle_t *handle;
2545 int ret;
2546
2547 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2548 return 0;
2549
2550 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
2551 return 0;
2552
2553 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) {
2554 ret = ocfs2_lock_refcount_tree(OCFS2_SB(inode->i_sb),
2555 le64_to_cpu(di->i_refcount_loc),
2556 1, &ref_tree, &ref_root_bh);
2557 if (ret) {
2558 mlog_errno(ret);
2559 goto out;
2560 }
2561 ref_ci = &ref_tree->rf_ci;
2562
2563 }
2564
2565 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2566 ret = ocfs2_xattr_ibody_remove(inode, di_bh,
2567 ref_ci, ref_root_bh);
2568 if (ret < 0) {
2569 mlog_errno(ret);
2570 goto out;
2571 }
2572 }
2573
2574 if (di->i_xattr_loc) {
2575 ret = ocfs2_xattr_free_block(inode,
2576 le64_to_cpu(di->i_xattr_loc),
2577 ref_ci, ref_root_bh);
2578 if (ret < 0) {
2579 mlog_errno(ret);
2580 goto out;
2581 }
2582 }
2583
2584 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
2585 OCFS2_INODE_UPDATE_CREDITS);
2586 if (IS_ERR(handle)) {
2587 ret = PTR_ERR(handle);
2588 mlog_errno(ret);
2589 goto out;
2590 }
2591 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
2592 OCFS2_JOURNAL_ACCESS_WRITE);
2593 if (ret) {
2594 mlog_errno(ret);
2595 goto out_commit;
2596 }
2597
2598 di->i_xattr_loc = 0;
2599
2600 spin_lock(&oi->ip_lock);
2601 oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
2602 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
2603 spin_unlock(&oi->ip_lock);
2604
2605 ocfs2_journal_dirty(handle, di_bh);
2606 out_commit:
2607 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
2608 out:
2609 if (ref_tree)
2610 ocfs2_unlock_refcount_tree(OCFS2_SB(inode->i_sb), ref_tree, 1);
2611 brelse(ref_root_bh);
2612 return ret;
2613 }
2614
2615 static int ocfs2_xattr_has_space_inline(struct inode *inode,
2616 struct ocfs2_dinode *di)
2617 {
2618 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2619 unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
2620 int free;
2621
2622 if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
2623 return 0;
2624
2625 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2626 struct ocfs2_inline_data *idata = &di->id2.i_data;
2627 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
2628 } else if (ocfs2_inode_is_fast_symlink(inode)) {
2629 free = ocfs2_fast_symlink_chars(inode->i_sb) -
2630 le64_to_cpu(di->i_size);
2631 } else {
2632 struct ocfs2_extent_list *el = &di->id2.i_list;
2633 free = (le16_to_cpu(el->l_count) -
2634 le16_to_cpu(el->l_next_free_rec)) *
2635 sizeof(struct ocfs2_extent_rec);
2636 }
2637 if (free >= xattrsize)
2638 return 1;
2639
2640 return 0;
2641 }
2642
2643 /*
2644 * ocfs2_xattr_ibody_find()
2645 *
2646 * Find extended attribute in inode block and
2647 * fill search info into struct ocfs2_xattr_search.
2648 */
2649 static int ocfs2_xattr_ibody_find(struct inode *inode,
2650 int name_index,
2651 const char *name,
2652 struct ocfs2_xattr_search *xs)
2653 {
2654 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2655 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2656 int ret;
2657 int has_space = 0;
2658
2659 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2660 return 0;
2661
2662 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2663 down_read(&oi->ip_alloc_sem);
2664 has_space = ocfs2_xattr_has_space_inline(inode, di);
2665 up_read(&oi->ip_alloc_sem);
2666 if (!has_space)
2667 return 0;
2668 }
2669
2670 xs->xattr_bh = xs->inode_bh;
2671 xs->end = (void *)di + inode->i_sb->s_blocksize;
2672 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
2673 xs->header = (struct ocfs2_xattr_header *)
2674 (xs->end - le16_to_cpu(di->i_xattr_inline_size));
2675 else
2676 xs->header = (struct ocfs2_xattr_header *)
2677 (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
2678 xs->base = (void *)xs->header;
2679 xs->here = xs->header->xh_entries;
2680
2681 /* Find the named attribute. */
2682 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2683 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2684 if (ret && ret != -ENODATA)
2685 return ret;
2686 xs->not_found = ret;
2687 }
2688
2689 return 0;
2690 }
2691
2692 static int ocfs2_xattr_ibody_init(struct inode *inode,
2693 struct buffer_head *di_bh,
2694 struct ocfs2_xattr_set_ctxt *ctxt)
2695 {
2696 int ret;
2697 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2698 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2699 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2700 unsigned int xattrsize = osb->s_xattr_inline_size;
2701
2702 if (!ocfs2_xattr_has_space_inline(inode, di)) {
2703 ret = -ENOSPC;
2704 goto out;
2705 }
2706
2707 ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode), di_bh,
2708 OCFS2_JOURNAL_ACCESS_WRITE);
2709 if (ret) {
2710 mlog_errno(ret);
2711 goto out;
2712 }
2713
2714 /*
2715 * Adjust extent record count or inline data size
2716 * to reserve space for extended attribute.
2717 */
2718 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2719 struct ocfs2_inline_data *idata = &di->id2.i_data;
2720 le16_add_cpu(&idata->id_count, -xattrsize);
2721 } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
2722 struct ocfs2_extent_list *el = &di->id2.i_list;
2723 le16_add_cpu(&el->l_count, -(xattrsize /
2724 sizeof(struct ocfs2_extent_rec)));
2725 }
2726 di->i_xattr_inline_size = cpu_to_le16(xattrsize);
2727
2728 spin_lock(&oi->ip_lock);
2729 oi->ip_dyn_features |= OCFS2_INLINE_XATTR_FL|OCFS2_HAS_XATTR_FL;
2730 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
2731 spin_unlock(&oi->ip_lock);
2732
2733 ocfs2_journal_dirty(ctxt->handle, di_bh);
2734
2735 out:
2736 return ret;
2737 }
2738
2739 /*
2740 * ocfs2_xattr_ibody_set()
2741 *
2742 * Set, replace or remove an extended attribute into inode block.
2743 *
2744 */
2745 static int ocfs2_xattr_ibody_set(struct inode *inode,
2746 struct ocfs2_xattr_info *xi,
2747 struct ocfs2_xattr_search *xs,
2748 struct ocfs2_xattr_set_ctxt *ctxt)
2749 {
2750 int ret;
2751 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2752 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2753 struct ocfs2_xa_loc loc;
2754
2755 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2756 return -ENOSPC;
2757
2758 down_write(&oi->ip_alloc_sem);
2759 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2760 if (!ocfs2_xattr_has_space_inline(inode, di)) {
2761 ret = -ENOSPC;
2762 goto out;
2763 }
2764 }
2765
2766 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2767 ret = ocfs2_xattr_ibody_init(inode, xs->inode_bh, ctxt);
2768 if (ret) {
2769 if (ret != -ENOSPC)
2770 mlog_errno(ret);
2771 goto out;
2772 }
2773 }
2774
2775 ocfs2_init_dinode_xa_loc(&loc, inode, xs->inode_bh,
2776 xs->not_found ? NULL : xs->here);
2777 ret = ocfs2_xa_set(&loc, xi, ctxt);
2778 if (ret) {
2779 if (ret != -ENOSPC)
2780 mlog_errno(ret);
2781 goto out;
2782 }
2783 xs->here = loc.xl_entry;
2784
2785 out:
2786 up_write(&oi->ip_alloc_sem);
2787
2788 return ret;
2789 }
2790
2791 /*
2792 * ocfs2_xattr_block_find()
2793 *
2794 * Find extended attribute in external block and
2795 * fill search info into struct ocfs2_xattr_search.
2796 */
2797 static int ocfs2_xattr_block_find(struct inode *inode,
2798 int name_index,
2799 const char *name,
2800 struct ocfs2_xattr_search *xs)
2801 {
2802 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2803 struct buffer_head *blk_bh = NULL;
2804 struct ocfs2_xattr_block *xb;
2805 int ret = 0;
2806
2807 if (!di->i_xattr_loc)
2808 return ret;
2809
2810 ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
2811 &blk_bh);
2812 if (ret < 0) {
2813 mlog_errno(ret);
2814 return ret;
2815 }
2816
2817 xs->xattr_bh = blk_bh;
2818 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2819
2820 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2821 xs->header = &xb->xb_attrs.xb_header;
2822 xs->base = (void *)xs->header;
2823 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
2824 xs->here = xs->header->xh_entries;
2825
2826 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2827 } else
2828 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
2829 name_index,
2830 name, xs);
2831
2832 if (ret && ret != -ENODATA) {
2833 xs->xattr_bh = NULL;
2834 goto cleanup;
2835 }
2836 xs->not_found = ret;
2837 return 0;
2838 cleanup:
2839 brelse(blk_bh);
2840
2841 return ret;
2842 }
2843
2844 static int ocfs2_create_xattr_block(struct inode *inode,
2845 struct buffer_head *inode_bh,
2846 struct ocfs2_xattr_set_ctxt *ctxt,
2847 int indexed,
2848 struct buffer_head **ret_bh)
2849 {
2850 int ret;
2851 u16 suballoc_bit_start;
2852 u32 num_got;
2853 u64 suballoc_loc, first_blkno;
2854 struct ocfs2_dinode *di = (struct ocfs2_dinode *)inode_bh->b_data;
2855 struct buffer_head *new_bh = NULL;
2856 struct ocfs2_xattr_block *xblk;
2857
2858 ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
2859 inode_bh, OCFS2_JOURNAL_ACCESS_CREATE);
2860 if (ret < 0) {
2861 mlog_errno(ret);
2862 goto end;
2863 }
2864
2865 ret = ocfs2_claim_metadata(ctxt->handle, ctxt->meta_ac, 1,
2866 &suballoc_loc, &suballoc_bit_start,
2867 &num_got, &first_blkno);
2868 if (ret < 0) {
2869 mlog_errno(ret);
2870 goto end;
2871 }
2872
2873 new_bh = sb_getblk(inode->i_sb, first_blkno);
2874 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), new_bh);
2875
2876 ret = ocfs2_journal_access_xb(ctxt->handle, INODE_CACHE(inode),
2877 new_bh,
2878 OCFS2_JOURNAL_ACCESS_CREATE);
2879 if (ret < 0) {
2880 mlog_errno(ret);
2881 goto end;
2882 }
2883
2884 /* Initialize ocfs2_xattr_block */
2885 xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
2886 memset(xblk, 0, inode->i_sb->s_blocksize);
2887 strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
2888 xblk->xb_suballoc_slot = cpu_to_le16(ctxt->meta_ac->ac_alloc_slot);
2889 xblk->xb_suballoc_loc = cpu_to_le64(suballoc_loc);
2890 xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
2891 xblk->xb_fs_generation =
2892 cpu_to_le32(OCFS2_SB(inode->i_sb)->fs_generation);
2893 xblk->xb_blkno = cpu_to_le64(first_blkno);
2894 if (indexed) {
2895 struct ocfs2_xattr_tree_root *xr = &xblk->xb_attrs.xb_root;
2896 xr->xt_clusters = cpu_to_le32(1);
2897 xr->xt_last_eb_blk = 0;
2898 xr->xt_list.l_tree_depth = 0;
2899 xr->xt_list.l_count = cpu_to_le16(
2900 ocfs2_xattr_recs_per_xb(inode->i_sb));
2901 xr->xt_list.l_next_free_rec = cpu_to_le16(1);
2902 xblk->xb_flags = cpu_to_le16(OCFS2_XATTR_INDEXED);
2903 }
2904 ocfs2_journal_dirty(ctxt->handle, new_bh);
2905
2906 /* Add it to the inode */
2907 di->i_xattr_loc = cpu_to_le64(first_blkno);
2908
2909 spin_lock(&OCFS2_I(inode)->ip_lock);
2910 OCFS2_I(inode)->ip_dyn_features |= OCFS2_HAS_XATTR_FL;
2911 di->i_dyn_features = cpu_to_le16(OCFS2_I(inode)->ip_dyn_features);
2912 spin_unlock(&OCFS2_I(inode)->ip_lock);
2913
2914 ocfs2_journal_dirty(ctxt->handle, inode_bh);
2915
2916 *ret_bh = new_bh;
2917 new_bh = NULL;
2918
2919 end:
2920 brelse(new_bh);
2921 return ret;
2922 }
2923
2924 /*
2925 * ocfs2_xattr_block_set()
2926 *
2927 * Set, replace or remove an extended attribute into external block.
2928 *
2929 */
2930 static int ocfs2_xattr_block_set(struct inode *inode,
2931 struct ocfs2_xattr_info *xi,
2932 struct ocfs2_xattr_search *xs,
2933 struct ocfs2_xattr_set_ctxt *ctxt)
2934 {
2935 struct buffer_head *new_bh = NULL;
2936 struct ocfs2_xattr_block *xblk = NULL;
2937 int ret;
2938 struct ocfs2_xa_loc loc;
2939
2940 if (!xs->xattr_bh) {
2941 ret = ocfs2_create_xattr_block(inode, xs->inode_bh, ctxt,
2942 0, &new_bh);
2943 if (ret) {
2944 mlog_errno(ret);
2945 goto end;
2946 }
2947
2948 xs->xattr_bh = new_bh;
2949 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2950 xs->header = &xblk->xb_attrs.xb_header;
2951 xs->base = (void *)xs->header;
2952 xs->end = (void *)xblk + inode->i_sb->s_blocksize;
2953 xs->here = xs->header->xh_entries;
2954 } else
2955 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2956
2957 if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
2958 ocfs2_init_xattr_block_xa_loc(&loc, inode, xs->xattr_bh,
2959 xs->not_found ? NULL : xs->here);
2960
2961 ret = ocfs2_xa_set(&loc, xi, ctxt);
2962 if (!ret)
2963 xs->here = loc.xl_entry;
2964 else if ((ret != -ENOSPC) || ctxt->set_abort)
2965 goto end;
2966 else {
2967 ret = ocfs2_xattr_create_index_block(inode, xs, ctxt);
2968 if (ret)
2969 goto end;
2970 }
2971 }
2972
2973 if (le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)
2974 ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs, ctxt);
2975
2976 end:
2977 return ret;
2978 }
2979
2980 /* Check whether the new xattr can be inserted into the inode. */
2981 static int ocfs2_xattr_can_be_in_inode(struct inode *inode,
2982 struct ocfs2_xattr_info *xi,
2983 struct ocfs2_xattr_search *xs)
2984 {
2985 struct ocfs2_xattr_entry *last;
2986 int free, i;
2987 size_t min_offs = xs->end - xs->base;
2988
2989 if (!xs->header)
2990 return 0;
2991
2992 last = xs->header->xh_entries;
2993
2994 for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
2995 size_t offs = le16_to_cpu(last->xe_name_offset);
2996 if (offs < min_offs)
2997 min_offs = offs;
2998 last += 1;
2999 }
3000
3001 free = min_offs - ((void *)last - xs->base) - OCFS2_XATTR_HEADER_GAP;
3002 if (free < 0)
3003 return 0;
3004
3005 BUG_ON(!xs->not_found);
3006
3007 if (free >= (sizeof(struct ocfs2_xattr_entry) + namevalue_size_xi(xi)))
3008 return 1;
3009
3010 return 0;
3011 }
3012
3013 static int ocfs2_calc_xattr_set_need(struct inode *inode,
3014 struct ocfs2_dinode *di,
3015 struct ocfs2_xattr_info *xi,
3016 struct ocfs2_xattr_search *xis,
3017 struct ocfs2_xattr_search *xbs,
3018 int *clusters_need,
3019 int *meta_need,
3020 int *credits_need)
3021 {
3022 int ret = 0, old_in_xb = 0;
3023 int clusters_add = 0, meta_add = 0, credits = 0;
3024 struct buffer_head *bh = NULL;
3025 struct ocfs2_xattr_block *xb = NULL;
3026 struct ocfs2_xattr_entry *xe = NULL;
3027 struct ocfs2_xattr_value_root *xv = NULL;
3028 char *base = NULL;
3029 int name_offset, name_len = 0;
3030 u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
3031 xi->xi_value_len);
3032 u64 value_size;
3033
3034 /*
3035 * Calculate the clusters we need to write.
3036 * No matter whether we replace an old one or add a new one,
3037 * we need this for writing.
3038 */
3039 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE)
3040 credits += new_clusters *
3041 ocfs2_clusters_to_blocks(inode->i_sb, 1);
3042
3043 if (xis->not_found && xbs->not_found) {
3044 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3045
3046 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3047 clusters_add += new_clusters;
3048 credits += ocfs2_calc_extend_credits(inode->i_sb,
3049 &def_xv.xv.xr_list,
3050 new_clusters);
3051 }
3052
3053 goto meta_guess;
3054 }
3055
3056 if (!xis->not_found) {
3057 xe = xis->here;
3058 name_offset = le16_to_cpu(xe->xe_name_offset);
3059 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3060 base = xis->base;
3061 credits += OCFS2_INODE_UPDATE_CREDITS;
3062 } else {
3063 int i, block_off = 0;
3064 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
3065 xe = xbs->here;
3066 name_offset = le16_to_cpu(xe->xe_name_offset);
3067 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3068 i = xbs->here - xbs->header->xh_entries;
3069 old_in_xb = 1;
3070
3071 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
3072 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3073 bucket_xh(xbs->bucket),
3074 i, &block_off,
3075 &name_offset);
3076 base = bucket_block(xbs->bucket, block_off);
3077 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3078 } else {
3079 base = xbs->base;
3080 credits += OCFS2_XATTR_BLOCK_UPDATE_CREDITS;
3081 }
3082 }
3083
3084 /*
3085 * delete a xattr doesn't need metadata and cluster allocation.
3086 * so just calculate the credits and return.
3087 *
3088 * The credits for removing the value tree will be extended
3089 * by ocfs2_remove_extent itself.
3090 */
3091 if (!xi->xi_value) {
3092 if (!ocfs2_xattr_is_local(xe))
3093 credits += ocfs2_remove_extent_credits(inode->i_sb);
3094
3095 goto out;
3096 }
3097
3098 /* do cluster allocation guess first. */
3099 value_size = le64_to_cpu(xe->xe_value_size);
3100
3101 if (old_in_xb) {
3102 /*
3103 * In xattr set, we always try to set the xe in inode first,
3104 * so if it can be inserted into inode successfully, the old
3105 * one will be removed from the xattr block, and this xattr
3106 * will be inserted into inode as a new xattr in inode.
3107 */
3108 if (ocfs2_xattr_can_be_in_inode(inode, xi, xis)) {
3109 clusters_add += new_clusters;
3110 credits += ocfs2_remove_extent_credits(inode->i_sb) +
3111 OCFS2_INODE_UPDATE_CREDITS;
3112 if (!ocfs2_xattr_is_local(xe))
3113 credits += ocfs2_calc_extend_credits(
3114 inode->i_sb,
3115 &def_xv.xv.xr_list,
3116 new_clusters);
3117 goto out;
3118 }
3119 }
3120
3121 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3122 /* the new values will be stored outside. */
3123 u32 old_clusters = 0;
3124
3125 if (!ocfs2_xattr_is_local(xe)) {
3126 old_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
3127 value_size);
3128 xv = (struct ocfs2_xattr_value_root *)
3129 (base + name_offset + name_len);
3130 value_size = OCFS2_XATTR_ROOT_SIZE;
3131 } else
3132 xv = &def_xv.xv;
3133
3134 if (old_clusters >= new_clusters) {
3135 credits += ocfs2_remove_extent_credits(inode->i_sb);
3136 goto out;
3137 } else {
3138 meta_add += ocfs2_extend_meta_needed(&xv->xr_list);
3139 clusters_add += new_clusters - old_clusters;
3140 credits += ocfs2_calc_extend_credits(inode->i_sb,
3141 &xv->xr_list,
3142 new_clusters -
3143 old_clusters);
3144 if (value_size >= OCFS2_XATTR_ROOT_SIZE)
3145 goto out;
3146 }
3147 } else {
3148 /*
3149 * Now the new value will be stored inside. So if the new
3150 * value is smaller than the size of value root or the old
3151 * value, we don't need any allocation, otherwise we have
3152 * to guess metadata allocation.
3153 */
3154 if ((ocfs2_xattr_is_local(xe) &&
3155 (value_size >= xi->xi_value_len)) ||
3156 (!ocfs2_xattr_is_local(xe) &&
3157 OCFS2_XATTR_ROOT_SIZE >= xi->xi_value_len))
3158 goto out;
3159 }
3160
3161 meta_guess:
3162 /* calculate metadata allocation. */
3163 if (di->i_xattr_loc) {
3164 if (!xbs->xattr_bh) {
3165 ret = ocfs2_read_xattr_block(inode,
3166 le64_to_cpu(di->i_xattr_loc),
3167 &bh);
3168 if (ret) {
3169 mlog_errno(ret);
3170 goto out;
3171 }
3172
3173 xb = (struct ocfs2_xattr_block *)bh->b_data;
3174 } else
3175 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
3176
3177 /*
3178 * If there is already an xattr tree, good, we can calculate
3179 * like other b-trees. Otherwise we may have the chance of
3180 * create a tree, the credit calculation is borrowed from
3181 * ocfs2_calc_extend_credits with root_el = NULL. And the
3182 * new tree will be cluster based, so no meta is needed.
3183 */
3184 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
3185 struct ocfs2_extent_list *el =
3186 &xb->xb_attrs.xb_root.xt_list;
3187 meta_add += ocfs2_extend_meta_needed(el);
3188 credits += ocfs2_calc_extend_credits(inode->i_sb,
3189 el, 1);
3190 } else
3191 credits += OCFS2_SUBALLOC_ALLOC + 1;
3192
3193 /*
3194 * This cluster will be used either for new bucket or for
3195 * new xattr block.
3196 * If the cluster size is the same as the bucket size, one
3197 * more is needed since we may need to extend the bucket
3198 * also.
3199 */
3200 clusters_add += 1;
3201 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3202 if (OCFS2_XATTR_BUCKET_SIZE ==
3203 OCFS2_SB(inode->i_sb)->s_clustersize) {
3204 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3205 clusters_add += 1;
3206 }
3207 } else {
3208 meta_add += 1;
3209 credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
3210 }
3211 out:
3212 if (clusters_need)
3213 *clusters_need = clusters_add;
3214 if (meta_need)
3215 *meta_need = meta_add;
3216 if (credits_need)
3217 *credits_need = credits;
3218 brelse(bh);
3219 return ret;
3220 }
3221
3222 static int ocfs2_init_xattr_set_ctxt(struct inode *inode,
3223 struct ocfs2_dinode *di,
3224 struct ocfs2_xattr_info *xi,
3225 struct ocfs2_xattr_search *xis,
3226 struct ocfs2_xattr_search *xbs,
3227 struct ocfs2_xattr_set_ctxt *ctxt,
3228 int extra_meta,
3229 int *credits)
3230 {
3231 int clusters_add, meta_add, ret;
3232 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3233
3234 memset(ctxt, 0, sizeof(struct ocfs2_xattr_set_ctxt));
3235
3236 ocfs2_init_dealloc_ctxt(&ctxt->dealloc);
3237
3238 ret = ocfs2_calc_xattr_set_need(inode, di, xi, xis, xbs,
3239 &clusters_add, &meta_add, credits);
3240 if (ret) {
3241 mlog_errno(ret);
3242 return ret;
3243 }
3244
3245 meta_add += extra_meta;
3246 trace_ocfs2_init_xattr_set_ctxt(xi->xi_name, meta_add,
3247 clusters_add, *credits);
3248
3249 if (meta_add) {
3250 ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add,
3251 &ctxt->meta_ac);
3252 if (ret) {
3253 mlog_errno(ret);
3254 goto out;
3255 }
3256 }
3257
3258 if (clusters_add) {
3259 ret = ocfs2_reserve_clusters(osb, clusters_add, &ctxt->data_ac);
3260 if (ret)
3261 mlog_errno(ret);
3262 }
3263 out:
3264 if (ret) {
3265 if (ctxt->meta_ac) {
3266 ocfs2_free_alloc_context(ctxt->meta_ac);
3267 ctxt->meta_ac = NULL;
3268 }
3269
3270 /*
3271 * We cannot have an error and a non null ctxt->data_ac.
3272 */
3273 }
3274
3275 return ret;
3276 }
3277
3278 static int __ocfs2_xattr_set_handle(struct inode *inode,
3279 struct ocfs2_dinode *di,
3280 struct ocfs2_xattr_info *xi,
3281 struct ocfs2_xattr_search *xis,
3282 struct ocfs2_xattr_search *xbs,
3283 struct ocfs2_xattr_set_ctxt *ctxt)
3284 {
3285 int ret = 0, credits, old_found;
3286
3287 if (!xi->xi_value) {
3288 /* Remove existing extended attribute */
3289 if (!xis->not_found)
3290 ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
3291 else if (!xbs->not_found)
3292 ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3293 } else {
3294 /* We always try to set extended attribute into inode first*/
3295 ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
3296 if (!ret && !xbs->not_found) {
3297 /*
3298 * If succeed and that extended attribute existing in
3299 * external block, then we will remove it.
3300 */
3301 xi->xi_value = NULL;
3302 xi->xi_value_len = 0;
3303
3304 old_found = xis->not_found;
3305 xis->not_found = -ENODATA;
3306 ret = ocfs2_calc_xattr_set_need(inode,
3307 di,
3308 xi,
3309 xis,
3310 xbs,
3311 NULL,
3312 NULL,
3313 &credits);
3314 xis->not_found = old_found;
3315 if (ret) {
3316 mlog_errno(ret);
3317 goto out;
3318 }
3319
3320 ret = ocfs2_extend_trans(ctxt->handle, credits);
3321 if (ret) {
3322 mlog_errno(ret);
3323 goto out;
3324 }
3325 ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3326 } else if ((ret == -ENOSPC) && !ctxt->set_abort) {
3327 if (di->i_xattr_loc && !xbs->xattr_bh) {
3328 ret = ocfs2_xattr_block_find(inode,
3329 xi->xi_name_index,
3330 xi->xi_name, xbs);
3331 if (ret)
3332 goto out;
3333
3334 old_found = xis->not_found;
3335 xis->not_found = -ENODATA;
3336 ret = ocfs2_calc_xattr_set_need(inode,
3337 di,
3338 xi,
3339 xis,
3340 xbs,
3341 NULL,
3342 NULL,
3343 &credits);
3344 xis->not_found = old_found;
3345 if (ret) {
3346 mlog_errno(ret);
3347 goto out;
3348 }
3349
3350 ret = ocfs2_extend_trans(ctxt->handle, credits);
3351 if (ret) {
3352 mlog_errno(ret);
3353 goto out;
3354 }
3355 }
3356 /*
3357 * If no space in inode, we will set extended attribute
3358 * into external block.
3359 */
3360 ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3361 if (ret)
3362 goto out;
3363 if (!xis->not_found) {
3364 /*
3365 * If succeed and that extended attribute
3366 * existing in inode, we will remove it.
3367 */
3368 xi->xi_value = NULL;
3369 xi->xi_value_len = 0;
3370 xbs->not_found = -ENODATA;
3371 ret = ocfs2_calc_xattr_set_need(inode,
3372 di,
3373 xi,
3374 xis,
3375 xbs,
3376 NULL,
3377 NULL,
3378 &credits);
3379 if (ret) {
3380 mlog_errno(ret);
3381 goto out;
3382 }
3383
3384 ret = ocfs2_extend_trans(ctxt->handle, credits);
3385 if (ret) {
3386 mlog_errno(ret);
3387 goto out;
3388 }
3389 ret = ocfs2_xattr_ibody_set(inode, xi,
3390 xis, ctxt);
3391 }
3392 }
3393 }
3394
3395 if (!ret) {
3396 /* Update inode ctime. */
3397 ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
3398 xis->inode_bh,
3399 OCFS2_JOURNAL_ACCESS_WRITE);
3400 if (ret) {
3401 mlog_errno(ret);
3402 goto out;
3403 }
3404
3405 inode->i_ctime = CURRENT_TIME;
3406 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
3407 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
3408 ocfs2_journal_dirty(ctxt->handle, xis->inode_bh);
3409 }
3410 out:
3411 return ret;
3412 }
3413
3414 /*
3415 * This function only called duing creating inode
3416 * for init security/acl xattrs of the new inode.
3417 * All transanction credits have been reserved in mknod.
3418 */
3419 int ocfs2_xattr_set_handle(handle_t *handle,
3420 struct inode *inode,
3421 struct buffer_head *di_bh,
3422 int name_index,
3423 const char *name,
3424 const void *value,
3425 size_t value_len,
3426 int flags,
3427 struct ocfs2_alloc_context *meta_ac,
3428 struct ocfs2_alloc_context *data_ac)
3429 {
3430 struct ocfs2_dinode *di;
3431 int ret;
3432
3433 struct ocfs2_xattr_info xi = {
3434 .xi_name_index = name_index,
3435 .xi_name = name,
3436 .xi_name_len = strlen(name),
3437 .xi_value = value,
3438 .xi_value_len = value_len,
3439 };
3440
3441 struct ocfs2_xattr_search xis = {
3442 .not_found = -ENODATA,
3443 };
3444
3445 struct ocfs2_xattr_search xbs = {
3446 .not_found = -ENODATA,
3447 };
3448
3449 struct ocfs2_xattr_set_ctxt ctxt = {
3450 .handle = handle,
3451 .meta_ac = meta_ac,
3452 .data_ac = data_ac,
3453 };
3454
3455 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
3456 return -EOPNOTSUPP;
3457
3458 /*
3459 * In extreme situation, may need xattr bucket when
3460 * block size is too small. And we have already reserved
3461 * the credits for bucket in mknod.
3462 */
3463 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) {
3464 xbs.bucket = ocfs2_xattr_bucket_new(inode);
3465 if (!xbs.bucket) {
3466 mlog_errno(-ENOMEM);
3467 return -ENOMEM;
3468 }
3469 }
3470
3471 xis.inode_bh = xbs.inode_bh = di_bh;
3472 di = (struct ocfs2_dinode *)di_bh->b_data;
3473
3474 down_write(&OCFS2_I(inode)->ip_xattr_sem);
3475
3476 ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
3477 if (ret)
3478 goto cleanup;
3479 if (xis.not_found) {
3480 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
3481 if (ret)
3482 goto cleanup;
3483 }
3484
3485 ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
3486
3487 cleanup:
3488 up_write(&OCFS2_I(inode)->ip_xattr_sem);
3489 brelse(xbs.xattr_bh);
3490 ocfs2_xattr_bucket_free(xbs.bucket);
3491
3492 return ret;
3493 }
3494
3495 /*
3496 * ocfs2_xattr_set()
3497 *
3498 * Set, replace or remove an extended attribute for this inode.
3499 * value is NULL to remove an existing extended attribute, else either
3500 * create or replace an extended attribute.
3501 */
3502 int ocfs2_xattr_set(struct inode *inode,
3503 int name_index,
3504 const char *name,
3505 const void *value,
3506 size_t value_len,
3507 int flags)
3508 {
3509 struct buffer_head *di_bh = NULL;
3510 struct ocfs2_dinode *di;
3511 int ret, credits, ref_meta = 0, ref_credits = 0;
3512 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3513 struct inode *tl_inode = osb->osb_tl_inode;
3514 struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
3515 struct ocfs2_refcount_tree *ref_tree = NULL;
3516
3517 struct ocfs2_xattr_info xi = {
3518 .xi_name_index = name_index,
3519 .xi_name = name,
3520 .xi_name_len = strlen(name),
3521 .xi_value = value,
3522 .xi_value_len = value_len,
3523 };
3524
3525 struct ocfs2_xattr_search xis = {
3526 .not_found = -ENODATA,
3527 };
3528
3529 struct ocfs2_xattr_search xbs = {
3530 .not_found = -ENODATA,
3531 };
3532
3533 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
3534 return -EOPNOTSUPP;
3535
3536 /*
3537 * Only xbs will be used on indexed trees. xis doesn't need a
3538 * bucket.
3539 */
3540 xbs.bucket = ocfs2_xattr_bucket_new(inode);
3541 if (!xbs.bucket) {
3542 mlog_errno(-ENOMEM);
3543 return -ENOMEM;
3544 }
3545
3546 ret = ocfs2_inode_lock(inode, &di_bh, 1);
3547 if (ret < 0) {
3548 mlog_errno(ret);
3549 goto cleanup_nolock;
3550 }
3551 xis.inode_bh = xbs.inode_bh = di_bh;
3552 di = (struct ocfs2_dinode *)di_bh->b_data;
3553
3554 down_write(&OCFS2_I(inode)->ip_xattr_sem);
3555 /*
3556 * Scan inode and external block to find the same name
3557 * extended attribute and collect search information.
3558 */
3559 ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
3560 if (ret)
3561 goto cleanup;
3562 if (xis.not_found) {
3563 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
3564 if (ret)
3565 goto cleanup;
3566 }
3567
3568 if (xis.not_found && xbs.not_found) {
3569 ret = -ENODATA;
3570 if (flags & XATTR_REPLACE)
3571 goto cleanup;
3572 ret = 0;
3573 if (!value)
3574 goto cleanup;
3575 } else {
3576 ret = -EEXIST;
3577 if (flags & XATTR_CREATE)
3578 goto cleanup;
3579 }
3580
3581 /* Check whether the value is refcounted and do some preparation. */
3582 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL &&
3583 (!xis.not_found || !xbs.not_found)) {
3584 ret = ocfs2_prepare_refcount_xattr(inode, di, &xi,
3585 &xis, &xbs, &ref_tree,
3586 &ref_meta, &ref_credits);
3587 if (ret) {
3588 mlog_errno(ret);
3589 goto cleanup;
3590 }
3591 }
3592
3593 mutex_lock(&tl_inode->i_mutex);
3594
3595 if (ocfs2_truncate_log_needs_flush(osb)) {
3596 ret = __ocfs2_flush_truncate_log(osb);
3597 if (ret < 0) {
3598 mutex_unlock(&tl_inode->i_mutex);
3599 mlog_errno(ret);
3600 goto cleanup;
3601 }
3602 }
3603 mutex_unlock(&tl_inode->i_mutex);
3604
3605 ret = ocfs2_init_xattr_set_ctxt(inode, di, &xi, &xis,
3606 &xbs, &ctxt, ref_meta, &credits);
3607 if (ret) {
3608 mlog_errno(ret);
3609 goto cleanup;
3610 }
3611
3612 /* we need to update inode's ctime field, so add credit for it. */
3613 credits += OCFS2_INODE_UPDATE_CREDITS;
3614 ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
3615 if (IS_ERR(ctxt.handle)) {
3616 ret = PTR_ERR(ctxt.handle);
3617 mlog_errno(ret);
3618 goto cleanup;
3619 }
3620
3621 ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
3622
3623 ocfs2_commit_trans(osb, ctxt.handle);
3624
3625 if (ctxt.data_ac)
3626 ocfs2_free_alloc_context(ctxt.data_ac);
3627 if (ctxt.meta_ac)
3628 ocfs2_free_alloc_context(ctxt.meta_ac);
3629 if (ocfs2_dealloc_has_cluster(&ctxt.dealloc))
3630 ocfs2_schedule_truncate_log_flush(osb, 1);
3631 ocfs2_run_deallocs(osb, &ctxt.dealloc);
3632
3633 cleanup:
3634 if (ref_tree)
3635 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3636 up_write(&OCFS2_I(inode)->ip_xattr_sem);
3637 if (!value && !ret) {
3638 ret = ocfs2_try_remove_refcount_tree(inode, di_bh);
3639 if (ret)
3640 mlog_errno(ret);
3641 }
3642 ocfs2_inode_unlock(inode, 1);
3643 cleanup_nolock:
3644 brelse(di_bh);
3645 brelse(xbs.xattr_bh);
3646 ocfs2_xattr_bucket_free(xbs.bucket);
3647
3648 return ret;
3649 }
3650
3651 /*
3652 * Find the xattr extent rec which may contains name_hash.
3653 * e_cpos will be the first name hash of the xattr rec.
3654 * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
3655 */
3656 static int ocfs2_xattr_get_rec(struct inode *inode,
3657 u32 name_hash,
3658 u64 *p_blkno,
3659 u32 *e_cpos,
3660 u32 *num_clusters,
3661 struct ocfs2_extent_list *el)
3662 {
3663 int ret = 0, i;
3664 struct buffer_head *eb_bh = NULL;
3665 struct ocfs2_extent_block *eb;
3666 struct ocfs2_extent_rec *rec = NULL;
3667 u64 e_blkno = 0;
3668
3669 if (el->l_tree_depth) {
3670 ret = ocfs2_find_leaf(INODE_CACHE(inode), el, name_hash,
3671 &eb_bh);
3672 if (ret) {
3673 mlog_errno(ret);
3674 goto out;
3675 }
3676
3677 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
3678 el = &eb->h_list;
3679
3680 if (el->l_tree_depth) {
3681 ocfs2_error(inode->i_sb,
3682 "Inode %lu has non zero tree depth in "
3683 "xattr tree block %llu\n", inode->i_ino,
3684 (unsigned long long)eb_bh->b_blocknr);
3685 ret = -EROFS;
3686 goto out;
3687 }
3688 }
3689
3690 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
3691 rec = &el->l_recs[i];
3692
3693 if (le32_to_cpu(rec->e_cpos) <= name_hash) {
3694 e_blkno = le64_to_cpu(rec->e_blkno);
3695 break;
3696 }
3697 }
3698
3699 if (!e_blkno) {
3700 ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
3701 "record (%u, %u, 0) in xattr", inode->i_ino,
3702 le32_to_cpu(rec->e_cpos),
3703 ocfs2_rec_clusters(el, rec));
3704 ret = -EROFS;
3705 goto out;
3706 }
3707
3708 *p_blkno = le64_to_cpu(rec->e_blkno);
3709 *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
3710 if (e_cpos)
3711 *e_cpos = le32_to_cpu(rec->e_cpos);
3712 out:
3713 brelse(eb_bh);
3714 return ret;
3715 }
3716
3717 typedef int (xattr_bucket_func)(struct inode *inode,
3718 struct ocfs2_xattr_bucket *bucket,
3719 void *para);
3720
3721 static int ocfs2_find_xe_in_bucket(struct inode *inode,
3722 struct ocfs2_xattr_bucket *bucket,
3723 int name_index,
3724 const char *name,
3725 u32 name_hash,
3726 u16 *xe_index,
3727 int *found)
3728 {
3729 int i, ret = 0, cmp = 1, block_off, new_offset;
3730 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
3731 size_t name_len = strlen(name);
3732 struct ocfs2_xattr_entry *xe = NULL;
3733 char *xe_name;
3734
3735 /*
3736 * We don't use binary search in the bucket because there
3737 * may be multiple entries with the same name hash.
3738 */
3739 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3740 xe = &xh->xh_entries[i];
3741
3742 if (name_hash > le32_to_cpu(xe->xe_name_hash))
3743 continue;
3744 else if (name_hash < le32_to_cpu(xe->xe_name_hash))
3745 break;
3746
3747 cmp = name_index - ocfs2_xattr_get_type(xe);
3748 if (!cmp)
3749 cmp = name_len - xe->xe_name_len;
3750 if (cmp)
3751 continue;
3752
3753 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3754 xh,
3755 i,
3756 &block_off,
3757 &new_offset);
3758 if (ret) {
3759 mlog_errno(ret);
3760 break;
3761 }
3762
3763
3764 xe_name = bucket_block(bucket, block_off) + new_offset;
3765 if (!memcmp(name, xe_name, name_len)) {
3766 *xe_index = i;
3767 *found = 1;
3768 ret = 0;
3769 break;
3770 }
3771 }
3772
3773 return ret;
3774 }
3775
3776 /*
3777 * Find the specified xattr entry in a series of buckets.
3778 * This series start from p_blkno and last for num_clusters.
3779 * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
3780 * the num of the valid buckets.
3781 *
3782 * Return the buffer_head this xattr should reside in. And if the xattr's
3783 * hash is in the gap of 2 buckets, return the lower bucket.
3784 */
3785 static int ocfs2_xattr_bucket_find(struct inode *inode,
3786 int name_index,
3787 const char *name,
3788 u32 name_hash,
3789 u64 p_blkno,
3790 u32 first_hash,
3791 u32 num_clusters,
3792 struct ocfs2_xattr_search *xs)
3793 {
3794 int ret, found = 0;
3795 struct ocfs2_xattr_header *xh = NULL;
3796 struct ocfs2_xattr_entry *xe = NULL;
3797 u16 index = 0;
3798 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3799 int low_bucket = 0, bucket, high_bucket;
3800 struct ocfs2_xattr_bucket *search;
3801 u32 last_hash;
3802 u64 blkno, lower_blkno = 0;
3803
3804 search = ocfs2_xattr_bucket_new(inode);
3805 if (!search) {
3806 ret = -ENOMEM;
3807 mlog_errno(ret);
3808 goto out;
3809 }
3810
3811 ret = ocfs2_read_xattr_bucket(search, p_blkno);
3812 if (ret) {
3813 mlog_errno(ret);
3814 goto out;
3815 }
3816
3817 xh = bucket_xh(search);
3818 high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
3819 while (low_bucket <= high_bucket) {
3820 ocfs2_xattr_bucket_relse(search);
3821
3822 bucket = (low_bucket + high_bucket) / 2;
3823 blkno = p_blkno + bucket * blk_per_bucket;
3824 ret = ocfs2_read_xattr_bucket(search, blkno);
3825 if (ret) {
3826 mlog_errno(ret);
3827 goto out;
3828 }
3829
3830 xh = bucket_xh(search);
3831 xe = &xh->xh_entries[0];
3832 if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
3833 high_bucket = bucket - 1;
3834 continue;
3835 }
3836
3837 /*
3838 * Check whether the hash of the last entry in our
3839 * bucket is larger than the search one. for an empty
3840 * bucket, the last one is also the first one.
3841 */
3842 if (xh->xh_count)
3843 xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
3844
3845 last_hash = le32_to_cpu(xe->xe_name_hash);
3846
3847 /* record lower_blkno which may be the insert place. */
3848 lower_blkno = blkno;
3849
3850 if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
3851 low_bucket = bucket + 1;
3852 continue;
3853 }
3854
3855 /* the searched xattr should reside in this bucket if exists. */
3856 ret = ocfs2_find_xe_in_bucket(inode, search,
3857 name_index, name, name_hash,
3858 &index, &found);
3859 if (ret) {
3860 mlog_errno(ret);
3861 goto out;
3862 }
3863 break;
3864 }
3865
3866 /*
3867 * Record the bucket we have found.
3868 * When the xattr's hash value is in the gap of 2 buckets, we will
3869 * always set it to the previous bucket.
3870 */
3871 if (!lower_blkno)
3872 lower_blkno = p_blkno;
3873
3874 /* This should be in cache - we just read it during the search */
3875 ret = ocfs2_read_xattr_bucket(xs->bucket, lower_blkno);
3876 if (ret) {
3877 mlog_errno(ret);
3878 goto out;
3879 }
3880
3881 xs->header = bucket_xh(xs->bucket);
3882 xs->base = bucket_block(xs->bucket, 0);
3883 xs->end = xs->base + inode->i_sb->s_blocksize;
3884
3885 if (found) {
3886 xs->here = &xs->header->xh_entries[index];
3887 trace_ocfs2_xattr_bucket_find(OCFS2_I(inode)->ip_blkno,
3888 name, name_index, name_hash,
3889 (unsigned long long)bucket_blkno(xs->bucket),
3890 index);
3891 } else
3892 ret = -ENODATA;
3893
3894 out:
3895 ocfs2_xattr_bucket_free(search);
3896 return ret;
3897 }
3898
3899 static int ocfs2_xattr_index_block_find(struct inode *inode,
3900 struct buffer_head *root_bh,
3901 int name_index,
3902 const char *name,
3903 struct ocfs2_xattr_search *xs)
3904 {
3905 int ret;
3906 struct ocfs2_xattr_block *xb =
3907 (struct ocfs2_xattr_block *)root_bh->b_data;
3908 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3909 struct ocfs2_extent_list *el = &xb_root->xt_list;
3910 u64 p_blkno = 0;
3911 u32 first_hash, num_clusters = 0;
3912 u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
3913
3914 if (le16_to_cpu(el->l_next_free_rec) == 0)
3915 return -ENODATA;
3916
3917 trace_ocfs2_xattr_index_block_find(OCFS2_I(inode)->ip_blkno,
3918 name, name_index, name_hash,
3919 (unsigned long long)root_bh->b_blocknr,
3920 -1);
3921
3922 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
3923 &num_clusters, el);
3924 if (ret) {
3925 mlog_errno(ret);
3926 goto out;
3927 }
3928
3929 BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
3930
3931 trace_ocfs2_xattr_index_block_find_rec(OCFS2_I(inode)->ip_blkno,
3932 name, name_index, first_hash,
3933 (unsigned long long)p_blkno,
3934 num_clusters);
3935
3936 ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
3937 p_blkno, first_hash, num_clusters, xs);
3938
3939 out:
3940 return ret;
3941 }
3942
3943 static int ocfs2_iterate_xattr_buckets(struct inode *inode,
3944 u64 blkno,
3945 u32 clusters,
3946 xattr_bucket_func *func,
3947 void *para)
3948 {
3949 int i, ret = 0;
3950 u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
3951 u32 num_buckets = clusters * bpc;
3952 struct ocfs2_xattr_bucket *bucket;
3953
3954 bucket = ocfs2_xattr_bucket_new(inode);
3955 if (!bucket) {
3956 mlog_errno(-ENOMEM);
3957 return -ENOMEM;
3958 }
3959
3960 trace_ocfs2_iterate_xattr_buckets(
3961 (unsigned long long)OCFS2_I(inode)->ip_blkno,
3962 (unsigned long long)blkno, clusters);
3963
3964 for (i = 0; i < num_buckets; i++, blkno += bucket->bu_blocks) {
3965 ret = ocfs2_read_xattr_bucket(bucket, blkno);
3966 if (ret) {
3967 mlog_errno(ret);
3968 break;
3969 }
3970
3971 /*
3972 * The real bucket num in this series of blocks is stored
3973 * in the 1st bucket.
3974 */
3975 if (i == 0)
3976 num_buckets = le16_to_cpu(bucket_xh(bucket)->xh_num_buckets);
3977
3978 trace_ocfs2_iterate_xattr_bucket((unsigned long long)blkno,
3979 le32_to_cpu(bucket_xh(bucket)->xh_entries[0].xe_name_hash));
3980 if (func) {
3981 ret = func(inode, bucket, para);
3982 if (ret && ret != -ERANGE)
3983 mlog_errno(ret);
3984 /* Fall through to bucket_relse() */
3985 }
3986
3987 ocfs2_xattr_bucket_relse(bucket);
3988 if (ret)
3989 break;
3990 }
3991
3992 ocfs2_xattr_bucket_free(bucket);
3993 return ret;
3994 }
3995
3996 struct ocfs2_xattr_tree_list {
3997 char *buffer;
3998 size_t buffer_size;
3999 size_t result;
4000 };
4001
4002 static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
4003 struct ocfs2_xattr_header *xh,
4004 int index,
4005 int *block_off,
4006 int *new_offset)
4007 {
4008 u16 name_offset;
4009
4010 if (index < 0 || index >= le16_to_cpu(xh->xh_count))
4011 return -EINVAL;
4012
4013 name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
4014
4015 *block_off = name_offset >> sb->s_blocksize_bits;
4016 *new_offset = name_offset % sb->s_blocksize;
4017
4018 return 0;
4019 }
4020
4021 static int ocfs2_list_xattr_bucket(struct inode *inode,
4022 struct ocfs2_xattr_bucket *bucket,
4023 void *para)
4024 {
4025 int ret = 0, type;
4026 struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
4027 int i, block_off, new_offset;
4028 const char *prefix, *name;
4029
4030 for (i = 0 ; i < le16_to_cpu(bucket_xh(bucket)->xh_count); i++) {
4031 struct ocfs2_xattr_entry *entry = &bucket_xh(bucket)->xh_entries[i];
4032 type = ocfs2_xattr_get_type(entry);
4033 prefix = ocfs2_xattr_prefix(type);
4034
4035 if (prefix) {
4036 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
4037 bucket_xh(bucket),
4038 i,
4039 &block_off,
4040 &new_offset);
4041 if (ret)
4042 break;
4043
4044 name = (const char *)bucket_block(bucket, block_off) +
4045 new_offset;
4046 ret = ocfs2_xattr_list_entry(xl->buffer,
4047 xl->buffer_size,
4048 &xl->result,
4049 prefix, name,
4050 entry->xe_name_len);
4051 if (ret)
4052 break;
4053 }
4054 }
4055
4056 return ret;
4057 }
4058
4059 static int ocfs2_iterate_xattr_index_block(struct inode *inode,
4060 struct buffer_head *blk_bh,
4061 xattr_tree_rec_func *rec_func,
4062 void *para)
4063 {
4064 struct ocfs2_xattr_block *xb =
4065 (struct ocfs2_xattr_block *)blk_bh->b_data;
4066 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
4067 int ret = 0;
4068 u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
4069 u64 p_blkno = 0;
4070
4071 if (!el->l_next_free_rec || !rec_func)
4072 return 0;
4073
4074 while (name_hash > 0) {
4075 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
4076 &e_cpos, &num_clusters, el);
4077 if (ret) {
4078 mlog_errno(ret);
4079 break;
4080 }
4081
4082 ret = rec_func(inode, blk_bh, p_blkno, e_cpos,
4083 num_clusters, para);
4084 if (ret) {
4085 if (ret != -ERANGE)
4086 mlog_errno(ret);
4087 break;
4088 }
4089
4090 if (e_cpos == 0)
4091 break;
4092
4093 name_hash = e_cpos - 1;
4094 }
4095
4096 return ret;
4097
4098 }
4099
4100 static int ocfs2_list_xattr_tree_rec(struct inode *inode,
4101 struct buffer_head *root_bh,
4102 u64 blkno, u32 cpos, u32 len, void *para)
4103 {
4104 return ocfs2_iterate_xattr_buckets(inode, blkno, len,
4105 ocfs2_list_xattr_bucket, para);
4106 }
4107
4108 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
4109 struct buffer_head *blk_bh,
4110 char *buffer,
4111 size_t buffer_size)
4112 {
4113 int ret;
4114 struct ocfs2_xattr_tree_list xl = {
4115 .buffer = buffer,
4116 .buffer_size = buffer_size,
4117 .result = 0,
4118 };
4119
4120 ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
4121 ocfs2_list_xattr_tree_rec, &xl);
4122 if (ret) {
4123 mlog_errno(ret);
4124 goto out;
4125 }
4126
4127 ret = xl.result;
4128 out:
4129 return ret;
4130 }
4131
4132 static int cmp_xe(const void *a, const void *b)
4133 {
4134 const struct ocfs2_xattr_entry *l = a, *r = b;
4135 u32 l_hash = le32_to_cpu(l->xe_name_hash);
4136 u32 r_hash = le32_to_cpu(r->xe_name_hash);
4137
4138 if (l_hash > r_hash)
4139 return 1;
4140 if (l_hash < r_hash)
4141 return -1;
4142 return 0;
4143 }
4144
4145 static void swap_xe(void *a, void *b, int size)
4146 {
4147 struct ocfs2_xattr_entry *l = a, *r = b, tmp;
4148
4149 tmp = *l;
4150 memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
4151 memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
4152 }
4153
4154 /*
4155 * When the ocfs2_xattr_block is filled up, new bucket will be created
4156 * and all the xattr entries will be moved to the new bucket.
4157 * The header goes at the start of the bucket, and the names+values are
4158 * filled from the end. This is why *target starts as the last buffer.
4159 * Note: we need to sort the entries since they are not saved in order
4160 * in the ocfs2_xattr_block.
4161 */
4162 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
4163 struct buffer_head *xb_bh,
4164 struct ocfs2_xattr_bucket *bucket)
4165 {
4166 int i, blocksize = inode->i_sb->s_blocksize;
4167 int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4168 u16 offset, size, off_change;
4169 struct ocfs2_xattr_entry *xe;
4170 struct ocfs2_xattr_block *xb =
4171 (struct ocfs2_xattr_block *)xb_bh->b_data;
4172 struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
4173 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
4174 u16 count = le16_to_cpu(xb_xh->xh_count);
4175 char *src = xb_bh->b_data;
4176 char *target = bucket_block(bucket, blks - 1);
4177
4178 trace_ocfs2_cp_xattr_block_to_bucket_begin(
4179 (unsigned long long)xb_bh->b_blocknr,
4180 (unsigned long long)bucket_blkno(bucket));
4181
4182 for (i = 0; i < blks; i++)
4183 memset(bucket_block(bucket, i), 0, blocksize);
4184
4185 /*
4186 * Since the xe_name_offset is based on ocfs2_xattr_header,
4187 * there is a offset change corresponding to the change of
4188 * ocfs2_xattr_header's position.
4189 */
4190 off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
4191 xe = &xb_xh->xh_entries[count - 1];
4192 offset = le16_to_cpu(xe->xe_name_offset) + off_change;
4193 size = blocksize - offset;
4194
4195 /* copy all the names and values. */
4196 memcpy(target + offset, src + offset, size);
4197
4198 /* Init new header now. */
4199 xh->xh_count = xb_xh->xh_count;
4200 xh->xh_num_buckets = cpu_to_le16(1);
4201 xh->xh_name_value_len = cpu_to_le16(size);
4202 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
4203
4204 /* copy all the entries. */
4205 target = bucket_block(bucket, 0);
4206 offset = offsetof(struct ocfs2_xattr_header, xh_entries);
4207 size = count * sizeof(struct ocfs2_xattr_entry);
4208 memcpy(target + offset, (char *)xb_xh + offset, size);
4209
4210 /* Change the xe offset for all the xe because of the move. */
4211 off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
4212 offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
4213 for (i = 0; i < count; i++)
4214 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
4215
4216 trace_ocfs2_cp_xattr_block_to_bucket_end(offset, size, off_change);
4217
4218 sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
4219 cmp_xe, swap_xe);
4220 }
4221
4222 /*
4223 * After we move xattr from block to index btree, we have to
4224 * update ocfs2_xattr_search to the new xe and base.
4225 *
4226 * When the entry is in xattr block, xattr_bh indicates the storage place.
4227 * While if the entry is in index b-tree, "bucket" indicates the
4228 * real place of the xattr.
4229 */
4230 static void ocfs2_xattr_update_xattr_search(struct inode *inode,
4231 struct ocfs2_xattr_search *xs,
4232 struct buffer_head *old_bh)
4233 {
4234 char *buf = old_bh->b_data;
4235 struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
4236 struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
4237 int i;
4238
4239 xs->header = bucket_xh(xs->bucket);
4240 xs->base = bucket_block(xs->bucket, 0);
4241 xs->end = xs->base + inode->i_sb->s_blocksize;
4242
4243 if (xs->not_found)
4244 return;
4245
4246 i = xs->here - old_xh->xh_entries;
4247 xs->here = &xs->header->xh_entries[i];
4248 }
4249
4250 static int ocfs2_xattr_create_index_block(struct inode *inode,
4251 struct ocfs2_xattr_search *xs,
4252 struct ocfs2_xattr_set_ctxt *ctxt)
4253 {
4254 int ret;
4255 u32 bit_off, len;
4256 u64 blkno;
4257 handle_t *handle = ctxt->handle;
4258 struct ocfs2_inode_info *oi = OCFS2_I(inode);
4259 struct buffer_head *xb_bh = xs->xattr_bh;
4260 struct ocfs2_xattr_block *xb =
4261 (struct ocfs2_xattr_block *)xb_bh->b_data;
4262 struct ocfs2_xattr_tree_root *xr;
4263 u16 xb_flags = le16_to_cpu(xb->xb_flags);
4264
4265 trace_ocfs2_xattr_create_index_block_begin(
4266 (unsigned long long)xb_bh->b_blocknr);
4267
4268 BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
4269 BUG_ON(!xs->bucket);
4270
4271 /*
4272 * XXX:
4273 * We can use this lock for now, and maybe move to a dedicated mutex
4274 * if performance becomes a problem later.
4275 */
4276 down_write(&oi->ip_alloc_sem);
4277
4278 ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), xb_bh,
4279 OCFS2_JOURNAL_ACCESS_WRITE);
4280 if (ret) {
4281 mlog_errno(ret);
4282 goto out;
4283 }
4284
4285 ret = __ocfs2_claim_clusters(handle, ctxt->data_ac,
4286 1, 1, &bit_off, &len);
4287 if (ret) {
4288 mlog_errno(ret);
4289 goto out;
4290 }
4291
4292 /*
4293 * The bucket may spread in many blocks, and
4294 * we will only touch the 1st block and the last block
4295 * in the whole bucket(one for entry and one for data).
4296 */
4297 blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
4298
4299 trace_ocfs2_xattr_create_index_block((unsigned long long)blkno);
4300
4301 ret = ocfs2_init_xattr_bucket(xs->bucket, blkno);
4302 if (ret) {
4303 mlog_errno(ret);
4304 goto out;
4305 }
4306
4307 ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
4308 OCFS2_JOURNAL_ACCESS_CREATE);
4309 if (ret) {
4310 mlog_errno(ret);
4311 goto out;
4312 }
4313
4314 ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xs->bucket);
4315 ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
4316
4317 ocfs2_xattr_update_xattr_search(inode, xs, xb_bh);
4318
4319 /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
4320 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
4321 offsetof(struct ocfs2_xattr_block, xb_attrs));
4322
4323 xr = &xb->xb_attrs.xb_root;
4324 xr->xt_clusters = cpu_to_le32(1);
4325 xr->xt_last_eb_blk = 0;
4326 xr->xt_list.l_tree_depth = 0;
4327 xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
4328 xr->xt_list.l_next_free_rec = cpu_to_le16(1);
4329
4330 xr->xt_list.l_recs[0].e_cpos = 0;
4331 xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
4332 xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
4333
4334 xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
4335
4336 ocfs2_journal_dirty(handle, xb_bh);
4337
4338 out:
4339 up_write(&oi->ip_alloc_sem);
4340
4341 return ret;
4342 }
4343
4344 static int cmp_xe_offset(const void *a, const void *b)
4345 {
4346 const struct ocfs2_xattr_entry *l = a, *r = b;
4347 u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
4348 u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
4349
4350 if (l_name_offset < r_name_offset)
4351 return 1;
4352 if (l_name_offset > r_name_offset)
4353 return -1;
4354 return 0;
4355 }
4356
4357 /*
4358 * defrag a xattr bucket if we find that the bucket has some
4359 * holes beteen name/value pairs.
4360 * We will move all the name/value pairs to the end of the bucket
4361 * so that we can spare some space for insertion.
4362 */
4363 static int ocfs2_defrag_xattr_bucket(struct inode *inode,
4364 handle_t *handle,
4365 struct ocfs2_xattr_bucket *bucket)
4366 {
4367 int ret, i;
4368 size_t end, offset, len;
4369 struct ocfs2_xattr_header *xh;
4370 char *entries, *buf, *bucket_buf = NULL;
4371 u64 blkno = bucket_blkno(bucket);
4372 u16 xh_free_start;
4373 size_t blocksize = inode->i_sb->s_blocksize;
4374 struct ocfs2_xattr_entry *xe;
4375
4376 /*
4377 * In order to make the operation more efficient and generic,
4378 * we copy all the blocks into a contiguous memory and do the
4379 * defragment there, so if anything is error, we will not touch
4380 * the real block.
4381 */
4382 bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
4383 if (!bucket_buf) {
4384 ret = -EIO;
4385 goto out;
4386 }
4387
4388 buf = bucket_buf;
4389 for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
4390 memcpy(buf, bucket_block(bucket, i), blocksize);
4391
4392 ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
4393 OCFS2_JOURNAL_ACCESS_WRITE);
4394 if (ret < 0) {
4395 mlog_errno(ret);
4396 goto out;
4397 }
4398
4399 xh = (struct ocfs2_xattr_header *)bucket_buf;
4400 entries = (char *)xh->xh_entries;
4401 xh_free_start = le16_to_cpu(xh->xh_free_start);
4402
4403 trace_ocfs2_defrag_xattr_bucket(
4404 (unsigned long long)blkno, le16_to_cpu(xh->xh_count),
4405 xh_free_start, le16_to_cpu(xh->xh_name_value_len));
4406
4407 /*
4408 * sort all the entries by their offset.
4409 * the largest will be the first, so that we can
4410 * move them to the end one by one.
4411 */
4412 sort(entries, le16_to_cpu(xh->xh_count),
4413 sizeof(struct ocfs2_xattr_entry),
4414 cmp_xe_offset, swap_xe);
4415
4416 /* Move all name/values to the end of the bucket. */
4417 xe = xh->xh_entries;
4418 end = OCFS2_XATTR_BUCKET_SIZE;
4419 for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
4420 offset = le16_to_cpu(xe->xe_name_offset);
4421 len = namevalue_size_xe(xe);
4422
4423 /*
4424 * We must make sure that the name/value pair
4425 * exist in the same block. So adjust end to
4426 * the previous block end if needed.
4427 */
4428 if (((end - len) / blocksize !=
4429 (end - 1) / blocksize))
4430 end = end - end % blocksize;
4431
4432 if (end > offset + len) {
4433 memmove(bucket_buf + end - len,
4434 bucket_buf + offset, len);
4435 xe->xe_name_offset = cpu_to_le16(end - len);
4436 }
4437
4438 mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
4439 "bucket %llu\n", (unsigned long long)blkno);
4440
4441 end -= len;
4442 }
4443
4444 mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
4445 "bucket %llu\n", (unsigned long long)blkno);
4446
4447 if (xh_free_start == end)
4448 goto out;
4449
4450 memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
4451 xh->xh_free_start = cpu_to_le16(end);
4452
4453 /* sort the entries by their name_hash. */
4454 sort(entries, le16_to_cpu(xh->xh_count),
4455 sizeof(struct ocfs2_xattr_entry),
4456 cmp_xe, swap_xe);
4457
4458 buf = bucket_buf;
4459 for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
4460 memcpy(bucket_block(bucket, i), buf, blocksize);
4461 ocfs2_xattr_bucket_journal_dirty(handle, bucket);
4462
4463 out:
4464 kfree(bucket_buf);
4465 return ret;
4466 }
4467
4468 /*
4469 * prev_blkno points to the start of an existing extent. new_blkno
4470 * points to a newly allocated extent. Because we know each of our
4471 * clusters contains more than bucket, we can easily split one cluster
4472 * at a bucket boundary. So we take the last cluster of the existing
4473 * extent and split it down the middle. We move the last half of the
4474 * buckets in the last cluster of the existing extent over to the new
4475 * extent.
4476 *
4477 * first_bh is the buffer at prev_blkno so we can update the existing
4478 * extent's bucket count. header_bh is the bucket were we were hoping
4479 * to insert our xattr. If the bucket move places the target in the new
4480 * extent, we'll update first_bh and header_bh after modifying the old
4481 * extent.
4482 *
4483 * first_hash will be set as the 1st xe's name_hash in the new extent.
4484 */
4485 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
4486 handle_t *handle,
4487 struct ocfs2_xattr_bucket *first,
4488 struct ocfs2_xattr_bucket *target,
4489 u64 new_blkno,
4490 u32 num_clusters,
4491 u32 *first_hash)
4492 {
4493 int ret;
4494 struct super_block *sb = inode->i_sb;
4495 int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(sb);
4496 int num_buckets = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(sb));
4497 int to_move = num_buckets / 2;
4498 u64 src_blkno;
4499 u64 last_cluster_blkno = bucket_blkno(first) +
4500 ((num_clusters - 1) * ocfs2_clusters_to_blocks(sb, 1));
4501
4502 BUG_ON(le16_to_cpu(bucket_xh(first)->xh_num_buckets) < num_buckets);
4503 BUG_ON(OCFS2_XATTR_BUCKET_SIZE == OCFS2_SB(sb)->s_clustersize);
4504
4505 trace_ocfs2_mv_xattr_bucket_cross_cluster(
4506 (unsigned long long)last_cluster_blkno,
4507 (unsigned long long)new_blkno);
4508
4509 ret = ocfs2_mv_xattr_buckets(inode, handle, bucket_blkno(first),
4510 last_cluster_blkno, new_blkno,
4511 to_move, first_hash);
4512 if (ret) {
4513 mlog_errno(ret);
4514 goto out;
4515 }
4516
4517 /* This is the first bucket that got moved */
4518 src_blkno = last_cluster_blkno + (to_move * blks_per_bucket);
4519
4520 /*
4521 * If the target bucket was part of the moved buckets, we need to
4522 * update first and target.
4523 */
4524 if (bucket_blkno(target) >= src_blkno) {
4525 /* Find the block for the new target bucket */
4526 src_blkno = new_blkno +
4527 (bucket_blkno(target) - src_blkno);
4528
4529 ocfs2_xattr_bucket_relse(first);
4530 ocfs2_xattr_bucket_relse(target);
4531
4532 /*
4533 * These shouldn't fail - the buffers are in the
4534 * journal from ocfs2_cp_xattr_bucket().
4535 */
4536 ret = ocfs2_read_xattr_bucket(first, new_blkno);
4537 if (ret) {
4538 mlog_errno(ret);
4539 goto out;
4540 }
4541 ret = ocfs2_read_xattr_bucket(target, src_blkno);
4542 if (ret)
4543 mlog_errno(ret);
4544
4545 }
4546
4547 out:
4548 return ret;
4549 }
4550
4551 /*
4552 * Find the suitable pos when we divide a bucket into 2.
4553 * We have to make sure the xattrs with the same hash value exist
4554 * in the same bucket.
4555 *
4556 * If this ocfs2_xattr_header covers more than one hash value, find a
4557 * place where the hash value changes. Try to find the most even split.
4558 * The most common case is that all entries have different hash values,
4559 * and the first check we make will find a place to split.
4560 */
4561 static int ocfs2_xattr_find_divide_pos(struct ocfs2_xattr_header *xh)
4562 {
4563 struct ocfs2_xattr_entry *entries = xh->xh_entries;
4564 int count = le16_to_cpu(xh->xh_count);
4565 int delta, middle = count / 2;
4566
4567 /*
4568 * We start at the middle. Each step gets farther away in both
4569 * directions. We therefore hit the change in hash value
4570 * nearest to the middle. Note that this loop does not execute for
4571 * count < 2.
4572 */
4573 for (delta = 0; delta < middle; delta++) {
4574 /* Let's check delta earlier than middle */
4575 if (cmp_xe(&entries[middle - delta - 1],
4576 &entries[middle - delta]))
4577 return middle - delta;
4578
4579 /* For even counts, don't walk off the end */
4580 if ((middle + delta + 1) == count)
4581 continue;
4582
4583 /* Now try delta past middle */
4584 if (cmp_xe(&entries[middle + delta],
4585 &entries[middle + delta + 1]))
4586 return middle + delta + 1;
4587 }
4588
4589 /* Every entry had the same hash */
4590 return count;
4591 }
4592
4593 /*
4594 * Move some xattrs in old bucket(blk) to new bucket(new_blk).
4595 * first_hash will record the 1st hash of the new bucket.
4596 *
4597 * Normally half of the xattrs will be moved. But we have to make
4598 * sure that the xattrs with the same hash value are stored in the
4599 * same bucket. If all the xattrs in this bucket have the same hash
4600 * value, the new bucket will be initialized as an empty one and the
4601 * first_hash will be initialized as (hash_value+1).
4602 */
4603 static int ocfs2_divide_xattr_bucket(struct inode *inode,
4604 handle_t *handle,
4605 u64 blk,
4606 u64 new_blk,
4607 u32 *first_hash,
4608 int new_bucket_head)
4609 {
4610 int ret, i;
4611 int count, start, len, name_value_len = 0, name_offset = 0;
4612 struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
4613 struct ocfs2_xattr_header *xh;
4614 struct ocfs2_xattr_entry *xe;
4615 int blocksize = inode->i_sb->s_blocksize;
4616
4617 trace_ocfs2_divide_xattr_bucket_begin((unsigned long long)blk,
4618 (unsigned long long)new_blk);
4619
4620 s_bucket = ocfs2_xattr_bucket_new(inode);
4621 t_bucket = ocfs2_xattr_bucket_new(inode);
4622 if (!s_bucket || !t_bucket) {
4623 ret = -ENOMEM;
4624 mlog_errno(ret);
4625 goto out;
4626 }
4627
4628 ret = ocfs2_read_xattr_bucket(s_bucket, blk);
4629 if (ret) {
4630 mlog_errno(ret);
4631 goto out;
4632 }
4633
4634 ret = ocfs2_xattr_bucket_journal_access(handle, s_bucket,
4635 OCFS2_JOURNAL_ACCESS_WRITE);
4636 if (ret) {
4637 mlog_errno(ret);
4638 goto out;
4639 }
4640
4641 /*
4642 * Even if !new_bucket_head, we're overwriting t_bucket. Thus,
4643 * there's no need to read it.
4644 */
4645 ret = ocfs2_init_xattr_bucket(t_bucket, new_blk);
4646 if (ret) {
4647 mlog_errno(ret);
4648 goto out;
4649 }
4650
4651 /*
4652 * Hey, if we're overwriting t_bucket, what difference does
4653 * ACCESS_CREATE vs ACCESS_WRITE make? See the comment in the
4654 * same part of ocfs2_cp_xattr_bucket().
4655 */
4656 ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4657 new_bucket_head ?
4658 OCFS2_JOURNAL_ACCESS_CREATE :
4659 OCFS2_JOURNAL_ACCESS_WRITE);
4660 if (ret) {
4661 mlog_errno(ret);
4662 goto out;
4663 }
4664
4665 xh = bucket_xh(s_bucket);
4666 count = le16_to_cpu(xh->xh_count);
4667 start = ocfs2_xattr_find_divide_pos(xh);
4668
4669 if (start == count) {
4670 xe = &xh->xh_entries[start-1];
4671
4672 /*
4673 * initialized a new empty bucket here.
4674 * The hash value is set as one larger than
4675 * that of the last entry in the previous bucket.
4676 */
4677 for (i = 0; i < t_bucket->bu_blocks; i++)
4678 memset(bucket_block(t_bucket, i), 0, blocksize);
4679
4680 xh = bucket_xh(t_bucket);
4681 xh->xh_free_start = cpu_to_le16(blocksize);
4682 xh->xh_entries[0].xe_name_hash = xe->xe_name_hash;
4683 le32_add_cpu(&xh->xh_entries[0].xe_name_hash, 1);
4684
4685 goto set_num_buckets;
4686 }
4687
4688 /* copy the whole bucket to the new first. */
4689 ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4690
4691 /* update the new bucket. */
4692 xh = bucket_xh(t_bucket);
4693
4694 /*
4695 * Calculate the total name/value len and xh_free_start for
4696 * the old bucket first.
4697 */
4698 name_offset = OCFS2_XATTR_BUCKET_SIZE;
4699 name_value_len = 0;
4700 for (i = 0; i < start; i++) {
4701 xe = &xh->xh_entries[i];
4702 name_value_len += namevalue_size_xe(xe);
4703 if (le16_to_cpu(xe->xe_name_offset) < name_offset)
4704 name_offset = le16_to_cpu(xe->xe_name_offset);
4705 }
4706
4707 /*
4708 * Now begin the modification to the new bucket.
4709 *
4710 * In the new bucket, We just move the xattr entry to the beginning
4711 * and don't touch the name/value. So there will be some holes in the
4712 * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
4713 * called.
4714 */
4715 xe = &xh->xh_entries[start];
4716 len = sizeof(struct ocfs2_xattr_entry) * (count - start);
4717 trace_ocfs2_divide_xattr_bucket_move(len,
4718 (int)((char *)xe - (char *)xh),
4719 (int)((char *)xh->xh_entries - (char *)xh));
4720 memmove((char *)xh->xh_entries, (char *)xe, len);
4721 xe = &xh->xh_entries[count - start];
4722 len = sizeof(struct ocfs2_xattr_entry) * start;
4723 memset((char *)xe, 0, len);
4724
4725 le16_add_cpu(&xh->xh_count, -start);
4726 le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
4727
4728 /* Calculate xh_free_start for the new bucket. */
4729 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
4730 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
4731 xe = &xh->xh_entries[i];
4732 if (le16_to_cpu(xe->xe_name_offset) <
4733 le16_to_cpu(xh->xh_free_start))
4734 xh->xh_free_start = xe->xe_name_offset;
4735 }
4736
4737 set_num_buckets:
4738 /* set xh->xh_num_buckets for the new xh. */
4739 if (new_bucket_head)
4740 xh->xh_num_buckets = cpu_to_le16(1);
4741 else
4742 xh->xh_num_buckets = 0;
4743
4744 ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4745
4746 /* store the first_hash of the new bucket. */
4747 if (first_hash)
4748 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
4749
4750 /*
4751 * Now only update the 1st block of the old bucket. If we
4752 * just added a new empty bucket, there is no need to modify
4753 * it.
4754 */
4755 if (start == count)
4756 goto out;
4757
4758 xh = bucket_xh(s_bucket);
4759 memset(&xh->xh_entries[start], 0,
4760 sizeof(struct ocfs2_xattr_entry) * (count - start));
4761 xh->xh_count = cpu_to_le16(start);
4762 xh->xh_free_start = cpu_to_le16(name_offset);
4763 xh->xh_name_value_len = cpu_to_le16(name_value_len);
4764
4765 ocfs2_xattr_bucket_journal_dirty(handle, s_bucket);
4766
4767 out:
4768 ocfs2_xattr_bucket_free(s_bucket);
4769 ocfs2_xattr_bucket_free(t_bucket);
4770
4771 return ret;
4772 }
4773
4774 /*
4775 * Copy xattr from one bucket to another bucket.
4776 *
4777 * The caller must make sure that the journal transaction
4778 * has enough space for journaling.
4779 */
4780 static int ocfs2_cp_xattr_bucket(struct inode *inode,
4781 handle_t *handle,
4782 u64 s_blkno,
4783 u64 t_blkno,
4784 int t_is_new)
4785 {
4786 int ret;
4787 struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
4788
4789 BUG_ON(s_blkno == t_blkno);
4790
4791 trace_ocfs2_cp_xattr_bucket((unsigned long long)s_blkno,
4792 (unsigned long long)t_blkno,
4793 t_is_new);
4794
4795 s_bucket = ocfs2_xattr_bucket_new(inode);
4796 t_bucket = ocfs2_xattr_bucket_new(inode);
4797 if (!s_bucket || !t_bucket) {
4798 ret = -ENOMEM;
4799 mlog_errno(ret);
4800 goto out;
4801 }
4802
4803 ret = ocfs2_read_xattr_bucket(s_bucket, s_blkno);
4804 if (ret)
4805 goto out;
4806
4807 /*
4808 * Even if !t_is_new, we're overwriting t_bucket. Thus,
4809 * there's no need to read it.
4810 */
4811 ret = ocfs2_init_xattr_bucket(t_bucket, t_blkno);
4812 if (ret)
4813 goto out;
4814
4815 /*
4816 * Hey, if we're overwriting t_bucket, what difference does
4817 * ACCESS_CREATE vs ACCESS_WRITE make? Well, if we allocated a new
4818 * cluster to fill, we came here from
4819 * ocfs2_mv_xattr_buckets(), and it is really new -
4820 * ACCESS_CREATE is required. But we also might have moved data
4821 * out of t_bucket before extending back into it.
4822 * ocfs2_add_new_xattr_bucket() can do this - its call to
4823 * ocfs2_add_new_xattr_cluster() may have created a new extent
4824 * and copied out the end of the old extent. Then it re-extends
4825 * the old extent back to create space for new xattrs. That's
4826 * how we get here, and the bucket isn't really new.
4827 */
4828 ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4829 t_is_new ?
4830 OCFS2_JOURNAL_ACCESS_CREATE :
4831 OCFS2_JOURNAL_ACCESS_WRITE);
4832 if (ret)
4833 goto out;
4834
4835 ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4836 ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4837
4838 out:
4839 ocfs2_xattr_bucket_free(t_bucket);
4840 ocfs2_xattr_bucket_free(s_bucket);
4841
4842 return ret;
4843 }
4844
4845 /*
4846 * src_blk points to the start of an existing extent. last_blk points to
4847 * last cluster in that extent. to_blk points to a newly allocated
4848 * extent. We copy the buckets from the cluster at last_blk to the new
4849 * extent. If start_bucket is non-zero, we skip that many buckets before
4850 * we start copying. The new extent's xh_num_buckets gets set to the
4851 * number of buckets we copied. The old extent's xh_num_buckets shrinks
4852 * by the same amount.
4853 */
4854 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
4855 u64 src_blk, u64 last_blk, u64 to_blk,
4856 unsigned int start_bucket,
4857 u32 *first_hash)
4858 {
4859 int i, ret, credits;
4860 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4861 int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4862 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
4863 struct ocfs2_xattr_bucket *old_first, *new_first;
4864
4865 trace_ocfs2_mv_xattr_buckets((unsigned long long)last_blk,
4866 (unsigned long long)to_blk);
4867
4868 BUG_ON(start_bucket >= num_buckets);
4869 if (start_bucket) {
4870 num_buckets -= start_bucket;
4871 last_blk += (start_bucket * blks_per_bucket);
4872 }
4873
4874 /* The first bucket of the original extent */
4875 old_first = ocfs2_xattr_bucket_new(inode);
4876 /* The first bucket of the new extent */
4877 new_first = ocfs2_xattr_bucket_new(inode);
4878 if (!old_first || !new_first) {
4879 ret = -ENOMEM;
4880 mlog_errno(ret);
4881 goto out;
4882 }
4883
4884 ret = ocfs2_read_xattr_bucket(old_first, src_blk);
4885 if (ret) {
4886 mlog_errno(ret);
4887 goto out;
4888 }
4889
4890 /*
4891 * We need to update the first bucket of the old extent and all
4892 * the buckets going to the new extent.
4893 */
4894 credits = ((num_buckets + 1) * blks_per_bucket);
4895 ret = ocfs2_extend_trans(handle, credits);
4896 if (ret) {
4897 mlog_errno(ret);
4898 goto out;
4899 }
4900
4901 ret = ocfs2_xattr_bucket_journal_access(handle, old_first,
4902 OCFS2_JOURNAL_ACCESS_WRITE);
4903 if (ret) {
4904 mlog_errno(ret);
4905 goto out;
4906 }
4907
4908 for (i = 0; i < num_buckets; i++) {
4909 ret = ocfs2_cp_xattr_bucket(inode, handle,
4910 last_blk + (i * blks_per_bucket),
4911 to_blk + (i * blks_per_bucket),
4912 1);
4913 if (ret) {
4914 mlog_errno(ret);
4915 goto out;
4916 }
4917 }
4918
4919 /*
4920 * Get the new bucket ready before we dirty anything
4921 * (This actually shouldn't fail, because we already dirtied
4922 * it once in ocfs2_cp_xattr_bucket()).
4923 */
4924 ret = ocfs2_read_xattr_bucket(new_first, to_blk);
4925 if (ret) {
4926 mlog_errno(ret);
4927 goto out;
4928 }
4929 ret = ocfs2_xattr_bucket_journal_access(handle, new_first,
4930 OCFS2_JOURNAL_ACCESS_WRITE);
4931 if (ret) {
4932 mlog_errno(ret);
4933 goto out;
4934 }
4935
4936 /* Now update the headers */
4937 le16_add_cpu(&bucket_xh(old_first)->xh_num_buckets, -num_buckets);
4938 ocfs2_xattr_bucket_journal_dirty(handle, old_first);
4939
4940 bucket_xh(new_first)->xh_num_buckets = cpu_to_le16(num_buckets);
4941 ocfs2_xattr_bucket_journal_dirty(handle, new_first);
4942
4943 if (first_hash)
4944 *first_hash = le32_to_cpu(bucket_xh(new_first)->xh_entries[0].xe_name_hash);
4945
4946 out:
4947 ocfs2_xattr_bucket_free(new_first);
4948 ocfs2_xattr_bucket_free(old_first);
4949 return ret;
4950 }
4951
4952 /*
4953 * Move some xattrs in this cluster to the new cluster.
4954 * This function should only be called when bucket size == cluster size.
4955 * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
4956 */
4957 static int ocfs2_divide_xattr_cluster(struct inode *inode,
4958 handle_t *handle,
4959 u64 prev_blk,
4960 u64 new_blk,
4961 u32 *first_hash)
4962 {
4963 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4964 int ret, credits = 2 * blk_per_bucket;
4965
4966 BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
4967
4968 ret = ocfs2_extend_trans(handle, credits);
4969 if (ret) {
4970 mlog_errno(ret);
4971 return ret;
4972 }
4973
4974 /* Move half of the xattr in start_blk to the next bucket. */
4975 return ocfs2_divide_xattr_bucket(inode, handle, prev_blk,
4976 new_blk, first_hash, 1);
4977 }
4978
4979 /*
4980 * Move some xattrs from the old cluster to the new one since they are not
4981 * contiguous in ocfs2 xattr tree.
4982 *
4983 * new_blk starts a new separate cluster, and we will move some xattrs from
4984 * prev_blk to it. v_start will be set as the first name hash value in this
4985 * new cluster so that it can be used as e_cpos during tree insertion and
4986 * don't collide with our original b-tree operations. first_bh and header_bh
4987 * will also be updated since they will be used in ocfs2_extend_xattr_bucket
4988 * to extend the insert bucket.
4989 *
4990 * The problem is how much xattr should we move to the new one and when should
4991 * we update first_bh and header_bh?
4992 * 1. If cluster size > bucket size, that means the previous cluster has more
4993 * than 1 bucket, so just move half nums of bucket into the new cluster and
4994 * update the first_bh and header_bh if the insert bucket has been moved
4995 * to the new cluster.
4996 * 2. If cluster_size == bucket_size:
4997 * a) If the previous extent rec has more than one cluster and the insert
4998 * place isn't in the last cluster, copy the entire last cluster to the
4999 * new one. This time, we don't need to upate the first_bh and header_bh
5000 * since they will not be moved into the new cluster.
5001 * b) Otherwise, move the bottom half of the xattrs in the last cluster into
5002 * the new one. And we set the extend flag to zero if the insert place is
5003 * moved into the new allocated cluster since no extend is needed.
5004 */
5005 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
5006 handle_t *handle,
5007 struct ocfs2_xattr_bucket *first,
5008 struct ocfs2_xattr_bucket *target,
5009 u64 new_blk,
5010 u32 prev_clusters,
5011 u32 *v_start,
5012 int *extend)
5013 {
5014 int ret;
5015
5016 trace_ocfs2_adjust_xattr_cross_cluster(
5017 (unsigned long long)bucket_blkno(first),
5018 (unsigned long long)new_blk, prev_clusters);
5019
5020 if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1) {
5021 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
5022 handle,
5023 first, target,
5024 new_blk,
5025 prev_clusters,
5026 v_start);
5027 if (ret)
5028 mlog_errno(ret);
5029 } else {
5030 /* The start of the last cluster in the first extent */
5031 u64 last_blk = bucket_blkno(first) +
5032 ((prev_clusters - 1) *
5033 ocfs2_clusters_to_blocks(inode->i_sb, 1));
5034
5035 if (prev_clusters > 1 && bucket_blkno(target) != last_blk) {
5036 ret = ocfs2_mv_xattr_buckets(inode, handle,
5037 bucket_blkno(first),
5038 last_blk, new_blk, 0,
5039 v_start);
5040 if (ret)
5041 mlog_errno(ret);
5042 } else {
5043 ret = ocfs2_divide_xattr_cluster(inode, handle,
5044 last_blk, new_blk,
5045 v_start);
5046 if (ret)
5047 mlog_errno(ret);
5048
5049 if ((bucket_blkno(target) == last_blk) && extend)
5050 *extend = 0;
5051 }
5052 }
5053
5054 return ret;
5055 }
5056
5057 /*
5058 * Add a new cluster for xattr storage.
5059 *
5060 * If the new cluster is contiguous with the previous one, it will be
5061 * appended to the same extent record, and num_clusters will be updated.
5062 * If not, we will insert a new extent for it and move some xattrs in
5063 * the last cluster into the new allocated one.
5064 * We also need to limit the maximum size of a btree leaf, otherwise we'll
5065 * lose the benefits of hashing because we'll have to search large leaves.
5066 * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
5067 * if it's bigger).
5068 *
5069 * first_bh is the first block of the previous extent rec and header_bh
5070 * indicates the bucket we will insert the new xattrs. They will be updated
5071 * when the header_bh is moved into the new cluster.
5072 */
5073 static int ocfs2_add_new_xattr_cluster(struct inode *inode,
5074 struct buffer_head *root_bh,
5075 struct ocfs2_xattr_bucket *first,
5076 struct ocfs2_xattr_bucket *target,
5077 u32 *num_clusters,
5078 u32 prev_cpos,
5079 int *extend,
5080 struct ocfs2_xattr_set_ctxt *ctxt)
5081 {
5082 int ret;
5083 u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
5084 u32 prev_clusters = *num_clusters;
5085 u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
5086 u64 block;
5087 handle_t *handle = ctxt->handle;
5088 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5089 struct ocfs2_extent_tree et;
5090
5091 trace_ocfs2_add_new_xattr_cluster_begin(
5092 (unsigned long long)OCFS2_I(inode)->ip_blkno,
5093 (unsigned long long)bucket_blkno(first),
5094 prev_cpos, prev_clusters);
5095
5096 ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
5097
5098 ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
5099 OCFS2_JOURNAL_ACCESS_WRITE);
5100 if (ret < 0) {
5101 mlog_errno(ret);
5102 goto leave;
5103 }
5104
5105 ret = __ocfs2_claim_clusters(handle, ctxt->data_ac, 1,
5106 clusters_to_add, &bit_off, &num_bits);
5107 if (ret < 0) {
5108 if (ret != -ENOSPC)
5109 mlog_errno(ret);
5110 goto leave;
5111 }
5112
5113 BUG_ON(num_bits > clusters_to_add);
5114
5115 block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
5116 trace_ocfs2_add_new_xattr_cluster((unsigned long long)block, num_bits);
5117
5118 if (bucket_blkno(first) + (prev_clusters * bpc) == block &&
5119 (prev_clusters + num_bits) << osb->s_clustersize_bits <=
5120 OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
5121 /*
5122 * If this cluster is contiguous with the old one and
5123 * adding this new cluster, we don't surpass the limit of
5124 * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
5125 * initialized and used like other buckets in the previous
5126 * cluster.
5127 * So add it as a contiguous one. The caller will handle
5128 * its init process.
5129 */
5130 v_start = prev_cpos + prev_clusters;
5131 *num_clusters = prev_clusters + num_bits;
5132 } else {
5133 ret = ocfs2_adjust_xattr_cross_cluster(inode,
5134 handle,
5135 first,
5136 target,
5137 block,
5138 prev_clusters,
5139 &v_start,
5140 extend);
5141 if (ret) {
5142 mlog_errno(ret);
5143 goto leave;
5144 }
5145 }
5146
5147 trace_ocfs2_add_new_xattr_cluster_insert((unsigned long long)block,
5148 v_start, num_bits);
5149 ret = ocfs2_insert_extent(handle, &et, v_start, block,
5150 num_bits, 0, ctxt->meta_ac);
5151 if (ret < 0) {
5152 mlog_errno(ret);
5153 goto leave;
5154 }
5155
5156 ocfs2_journal_dirty(handle, root_bh);
5157
5158 leave:
5159 return ret;
5160 }
5161
5162 /*
5163 * We are given an extent. 'first' is the bucket at the very front of
5164 * the extent. The extent has space for an additional bucket past
5165 * bucket_xh(first)->xh_num_buckets. 'target_blkno' is the block number
5166 * of the target bucket. We wish to shift every bucket past the target
5167 * down one, filling in that additional space. When we get back to the
5168 * target, we split the target between itself and the now-empty bucket
5169 * at target+1 (aka, target_blkno + blks_per_bucket).
5170 */
5171 static int ocfs2_extend_xattr_bucket(struct inode *inode,
5172 handle_t *handle,
5173 struct ocfs2_xattr_bucket *first,
5174 u64 target_blk,
5175 u32 num_clusters)
5176 {
5177 int ret, credits;
5178 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5179 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5180 u64 end_blk;
5181 u16 new_bucket = le16_to_cpu(bucket_xh(first)->xh_num_buckets);
5182
5183 trace_ocfs2_extend_xattr_bucket((unsigned long long)target_blk,
5184 (unsigned long long)bucket_blkno(first),
5185 num_clusters, new_bucket);
5186
5187 /* The extent must have room for an additional bucket */
5188 BUG_ON(new_bucket >=
5189 (num_clusters * ocfs2_xattr_buckets_per_cluster(osb)));
5190
5191 /* end_blk points to the last existing bucket */
5192 end_blk = bucket_blkno(first) + ((new_bucket - 1) * blk_per_bucket);
5193
5194 /*
5195 * end_blk is the start of the last existing bucket.
5196 * Thus, (end_blk - target_blk) covers the target bucket and
5197 * every bucket after it up to, but not including, the last
5198 * existing bucket. Then we add the last existing bucket, the
5199 * new bucket, and the first bucket (3 * blk_per_bucket).
5200 */
5201 credits = (end_blk - target_blk) + (3 * blk_per_bucket);
5202 ret = ocfs2_extend_trans(handle, credits);
5203 if (ret) {
5204 mlog_errno(ret);
5205 goto out;
5206 }
5207
5208 ret = ocfs2_xattr_bucket_journal_access(handle, first,
5209 OCFS2_JOURNAL_ACCESS_WRITE);
5210 if (ret) {
5211 mlog_errno(ret);
5212 goto out;
5213 }
5214
5215 while (end_blk != target_blk) {
5216 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
5217 end_blk + blk_per_bucket, 0);
5218 if (ret)
5219 goto out;
5220 end_blk -= blk_per_bucket;
5221 }
5222
5223 /* Move half of the xattr in target_blkno to the next bucket. */
5224 ret = ocfs2_divide_xattr_bucket(inode, handle, target_blk,
5225 target_blk + blk_per_bucket, NULL, 0);
5226
5227 le16_add_cpu(&bucket_xh(first)->xh_num_buckets, 1);
5228 ocfs2_xattr_bucket_journal_dirty(handle, first);
5229
5230 out:
5231 return ret;
5232 }
5233
5234 /*
5235 * Add new xattr bucket in an extent record and adjust the buckets
5236 * accordingly. xb_bh is the ocfs2_xattr_block, and target is the
5237 * bucket we want to insert into.
5238 *
5239 * In the easy case, we will move all the buckets after target down by
5240 * one. Half of target's xattrs will be moved to the next bucket.
5241 *
5242 * If current cluster is full, we'll allocate a new one. This may not
5243 * be contiguous. The underlying calls will make sure that there is
5244 * space for the insert, shifting buckets around if necessary.
5245 * 'target' may be moved by those calls.
5246 */
5247 static int ocfs2_add_new_xattr_bucket(struct inode *inode,
5248 struct buffer_head *xb_bh,
5249 struct ocfs2_xattr_bucket *target,
5250 struct ocfs2_xattr_set_ctxt *ctxt)
5251 {
5252 struct ocfs2_xattr_block *xb =
5253 (struct ocfs2_xattr_block *)xb_bh->b_data;
5254 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
5255 struct ocfs2_extent_list *el = &xb_root->xt_list;
5256 u32 name_hash =
5257 le32_to_cpu(bucket_xh(target)->xh_entries[0].xe_name_hash);
5258 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5259 int ret, num_buckets, extend = 1;
5260 u64 p_blkno;
5261 u32 e_cpos, num_clusters;
5262 /* The bucket at the front of the extent */
5263 struct ocfs2_xattr_bucket *first;
5264
5265 trace_ocfs2_add_new_xattr_bucket(
5266 (unsigned long long)bucket_blkno(target));
5267
5268 /* The first bucket of the original extent */
5269 first = ocfs2_xattr_bucket_new(inode);
5270 if (!first) {
5271 ret = -ENOMEM;
5272 mlog_errno(ret);
5273 goto out;
5274 }
5275
5276 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
5277 &num_clusters, el);
5278 if (ret) {
5279 mlog_errno(ret);
5280 goto out;
5281 }
5282
5283 ret = ocfs2_read_xattr_bucket(first, p_blkno);
5284 if (ret) {
5285 mlog_errno(ret);
5286 goto out;
5287 }
5288
5289 num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
5290 if (num_buckets == le16_to_cpu(bucket_xh(first)->xh_num_buckets)) {
5291 /*
5292 * This can move first+target if the target bucket moves
5293 * to the new extent.
5294 */
5295 ret = ocfs2_add_new_xattr_cluster(inode,
5296 xb_bh,
5297 first,
5298 target,
5299 &num_clusters,
5300 e_cpos,
5301 &extend,
5302 ctxt);
5303 if (ret) {
5304 mlog_errno(ret);
5305 goto out;
5306 }
5307 }
5308
5309 if (extend) {
5310 ret = ocfs2_extend_xattr_bucket(inode,
5311 ctxt->handle,
5312 first,
5313 bucket_blkno(target),
5314 num_clusters);
5315 if (ret)
5316 mlog_errno(ret);
5317 }
5318
5319 out:
5320 ocfs2_xattr_bucket_free(first);
5321
5322 return ret;
5323 }
5324
5325 static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode,
5326 struct ocfs2_xattr_bucket *bucket,
5327 int offs)
5328 {
5329 int block_off = offs >> inode->i_sb->s_blocksize_bits;
5330
5331 offs = offs % inode->i_sb->s_blocksize;
5332 return bucket_block(bucket, block_off) + offs;
5333 }
5334
5335 /*
5336 * Truncate the specified xe_off entry in xattr bucket.
5337 * bucket is indicated by header_bh and len is the new length.
5338 * Both the ocfs2_xattr_value_root and the entry will be updated here.
5339 *
5340 * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
5341 */
5342 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
5343 struct ocfs2_xattr_bucket *bucket,
5344 int xe_off,
5345 int len,
5346 struct ocfs2_xattr_set_ctxt *ctxt)
5347 {
5348 int ret, offset;
5349 u64 value_blk;
5350 struct ocfs2_xattr_entry *xe;
5351 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5352 size_t blocksize = inode->i_sb->s_blocksize;
5353 struct ocfs2_xattr_value_buf vb = {
5354 .vb_access = ocfs2_journal_access,
5355 };
5356
5357 xe = &xh->xh_entries[xe_off];
5358
5359 BUG_ON(!xe || ocfs2_xattr_is_local(xe));
5360
5361 offset = le16_to_cpu(xe->xe_name_offset) +
5362 OCFS2_XATTR_SIZE(xe->xe_name_len);
5363
5364 value_blk = offset / blocksize;
5365
5366 /* We don't allow ocfs2_xattr_value to be stored in different block. */
5367 BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
5368
5369 vb.vb_bh = bucket->bu_bhs[value_blk];
5370 BUG_ON(!vb.vb_bh);
5371
5372 vb.vb_xv = (struct ocfs2_xattr_value_root *)
5373 (vb.vb_bh->b_data + offset % blocksize);
5374
5375 /*
5376 * From here on out we have to dirty the bucket. The generic
5377 * value calls only modify one of the bucket's bhs, but we need
5378 * to send the bucket at once. So if they error, they *could* have
5379 * modified something. We have to assume they did, and dirty
5380 * the whole bucket. This leaves us in a consistent state.
5381 */
5382 trace_ocfs2_xattr_bucket_value_truncate(
5383 (unsigned long long)bucket_blkno(bucket), xe_off, len);
5384 ret = ocfs2_xattr_value_truncate(inode, &vb, len, ctxt);
5385 if (ret) {
5386 mlog_errno(ret);
5387 goto out;
5388 }
5389
5390 ret = ocfs2_xattr_bucket_journal_access(ctxt->handle, bucket,
5391 OCFS2_JOURNAL_ACCESS_WRITE);
5392 if (ret) {
5393 mlog_errno(ret);
5394 goto out;
5395 }
5396
5397 xe->xe_value_size = cpu_to_le64(len);
5398
5399 ocfs2_xattr_bucket_journal_dirty(ctxt->handle, bucket);
5400
5401 out:
5402 return ret;
5403 }
5404
5405 static int ocfs2_rm_xattr_cluster(struct inode *inode,
5406 struct buffer_head *root_bh,
5407 u64 blkno,
5408 u32 cpos,
5409 u32 len,
5410 void *para)
5411 {
5412 int ret;
5413 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5414 struct inode *tl_inode = osb->osb_tl_inode;
5415 handle_t *handle;
5416 struct ocfs2_xattr_block *xb =
5417 (struct ocfs2_xattr_block *)root_bh->b_data;
5418 struct ocfs2_alloc_context *meta_ac = NULL;
5419 struct ocfs2_cached_dealloc_ctxt dealloc;
5420 struct ocfs2_extent_tree et;
5421
5422 ret = ocfs2_iterate_xattr_buckets(inode, blkno, len,
5423 ocfs2_delete_xattr_in_bucket, para);
5424 if (ret) {
5425 mlog_errno(ret);
5426 return ret;
5427 }
5428
5429 ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
5430
5431 ocfs2_init_dealloc_ctxt(&dealloc);
5432
5433 trace_ocfs2_rm_xattr_cluster(
5434 (unsigned long long)OCFS2_I(inode)->ip_blkno,
5435 (unsigned long long)blkno, cpos, len);
5436
5437 ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode), blkno,
5438 len);
5439
5440 ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
5441 if (ret) {
5442 mlog_errno(ret);
5443 return ret;
5444 }
5445
5446 mutex_lock(&tl_inode->i_mutex);
5447
5448 if (ocfs2_truncate_log_needs_flush(osb)) {
5449 ret = __ocfs2_flush_truncate_log(osb);
5450 if (ret < 0) {
5451 mlog_errno(ret);
5452 goto out;
5453 }
5454 }
5455
5456 handle = ocfs2_start_trans(osb, ocfs2_remove_extent_credits(osb->sb));
5457 if (IS_ERR(handle)) {
5458 ret = -ENOMEM;
5459 mlog_errno(ret);
5460 goto out;
5461 }
5462
5463 ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
5464 OCFS2_JOURNAL_ACCESS_WRITE);
5465 if (ret) {
5466 mlog_errno(ret);
5467 goto out_commit;
5468 }
5469
5470 ret = ocfs2_remove_extent(handle, &et, cpos, len, meta_ac,
5471 &dealloc);
5472 if (ret) {
5473 mlog_errno(ret);
5474 goto out_commit;
5475 }
5476
5477 le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
5478 ocfs2_journal_dirty(handle, root_bh);
5479
5480 ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
5481 if (ret)
5482 mlog_errno(ret);
5483
5484 out_commit:
5485 ocfs2_commit_trans(osb, handle);
5486 out:
5487 ocfs2_schedule_truncate_log_flush(osb, 1);
5488
5489 mutex_unlock(&tl_inode->i_mutex);
5490
5491 if (meta_ac)
5492 ocfs2_free_alloc_context(meta_ac);
5493
5494 ocfs2_run_deallocs(osb, &dealloc);
5495
5496 return ret;
5497 }
5498
5499 /*
5500 * check whether the xattr bucket is filled up with the same hash value.
5501 * If we want to insert the xattr with the same hash, return -ENOSPC.
5502 * If we want to insert a xattr with different hash value, go ahead
5503 * and ocfs2_divide_xattr_bucket will handle this.
5504 */
5505 static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
5506 struct ocfs2_xattr_bucket *bucket,
5507 const char *name)
5508 {
5509 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5510 u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
5511
5512 if (name_hash != le32_to_cpu(xh->xh_entries[0].xe_name_hash))
5513 return 0;
5514
5515 if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
5516 xh->xh_entries[0].xe_name_hash) {
5517 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
5518 "hash = %u\n",
5519 (unsigned long long)bucket_blkno(bucket),
5520 le32_to_cpu(xh->xh_entries[0].xe_name_hash));
5521 return -ENOSPC;
5522 }
5523
5524 return 0;
5525 }
5526
5527 /*
5528 * Try to set the entry in the current bucket. If we fail, the caller
5529 * will handle getting us another bucket.
5530 */
5531 static int ocfs2_xattr_set_entry_bucket(struct inode *inode,
5532 struct ocfs2_xattr_info *xi,
5533 struct ocfs2_xattr_search *xs,
5534 struct ocfs2_xattr_set_ctxt *ctxt)
5535 {
5536 int ret;
5537 struct ocfs2_xa_loc loc;
5538
5539 trace_ocfs2_xattr_set_entry_bucket(xi->xi_name);
5540
5541 ocfs2_init_xattr_bucket_xa_loc(&loc, xs->bucket,
5542 xs->not_found ? NULL : xs->here);
5543 ret = ocfs2_xa_set(&loc, xi, ctxt);
5544 if (!ret) {
5545 xs->here = loc.xl_entry;
5546 goto out;
5547 }
5548 if (ret != -ENOSPC) {
5549 mlog_errno(ret);
5550 goto out;
5551 }
5552
5553 /* Ok, we need space. Let's try defragmenting the bucket. */
5554 ret = ocfs2_defrag_xattr_bucket(inode, ctxt->handle,
5555 xs->bucket);
5556 if (ret) {
5557 mlog_errno(ret);
5558 goto out;
5559 }
5560
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
5569
5570 out:
5571 return ret;
5572 }
5573
5574 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
5575 struct ocfs2_xattr_info *xi,
5576 struct ocfs2_xattr_search *xs,
5577 struct ocfs2_xattr_set_ctxt *ctxt)
5578 {
5579 int ret;
5580
5581 trace_ocfs2_xattr_set_entry_index_block(xi->xi_name);
5582
5583 ret = ocfs2_xattr_set_entry_bucket(inode, xi, xs, ctxt);
5584 if (!ret)
5585 goto out;
5586 if (ret != -ENOSPC) {
5587 mlog_errno(ret);
5588 goto out;
5589 }
5590
5591 /* Ack, need more space. Let's try to get another bucket! */
5592
5593 /*
5594 * We do not allow for overlapping ranges between buckets. And
5595 * the maximum number of collisions we will allow for then is
5596 * one bucket's worth, so check it here whether we need to
5597 * add a new bucket for the insert.
5598 */
5599 ret = ocfs2_check_xattr_bucket_collision(inode,
5600 xs->bucket,
5601 xi->xi_name);
5602 if (ret) {
5603 mlog_errno(ret);
5604 goto out;
5605 }
5606
5607 ret = ocfs2_add_new_xattr_bucket(inode,
5608 xs->xattr_bh,
5609 xs->bucket,
5610 ctxt);
5611 if (ret) {
5612 mlog_errno(ret);
5613 goto out;
5614 }
5615
5616 /*
5617 * ocfs2_add_new_xattr_bucket() will have updated
5618 * xs->bucket if it moved, but it will not have updated
5619 * any of the other search fields. Thus, we drop it and
5620 * re-search. Everything should be cached, so it'll be
5621 * quick.
5622 */
5623 ocfs2_xattr_bucket_relse(xs->bucket);
5624 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
5625 xi->xi_name_index,
5626 xi->xi_name, xs);
5627 if (ret && ret != -ENODATA)
5628 goto out;
5629 xs->not_found = ret;
5630
5631 /* Ok, we have a new bucket, let's try again */
5632 ret = ocfs2_xattr_set_entry_bucket(inode, xi, xs, ctxt);
5633 if (ret && (ret != -ENOSPC))
5634 mlog_errno(ret);
5635
5636 out:
5637 return ret;
5638 }
5639
5640 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
5641 struct ocfs2_xattr_bucket *bucket,
5642 void *para)
5643 {
5644 int ret = 0, ref_credits;
5645 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5646 u16 i;
5647 struct ocfs2_xattr_entry *xe;
5648 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5649 struct ocfs2_xattr_set_ctxt ctxt = {NULL, NULL,};
5650 int credits = ocfs2_remove_extent_credits(osb->sb) +
5651 ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5652 struct ocfs2_xattr_value_root *xv;
5653 struct ocfs2_rm_xattr_bucket_para *args =
5654 (struct ocfs2_rm_xattr_bucket_para *)para;
5655
5656 ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
5657
5658 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
5659 xe = &xh->xh_entries[i];
5660 if (ocfs2_xattr_is_local(xe))
5661 continue;
5662
5663 ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket,
5664 i, &xv, NULL);
5665
5666 ret = ocfs2_lock_xattr_remove_allocators(inode, xv,
5667 args->ref_ci,
5668 args->ref_root_bh,
5669 &ctxt.meta_ac,
5670 &ref_credits);
5671
5672 ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
5673 if (IS_ERR(ctxt.handle)) {
5674 ret = PTR_ERR(ctxt.handle);
5675 mlog_errno(ret);
5676 break;
5677 }
5678
5679 ret = ocfs2_xattr_bucket_value_truncate(inode, bucket,
5680 i, 0, &ctxt);
5681
5682 ocfs2_commit_trans(osb, ctxt.handle);
5683 if (ctxt.meta_ac) {
5684 ocfs2_free_alloc_context(ctxt.meta_ac);
5685 ctxt.meta_ac = NULL;
5686 }
5687 if (ret) {
5688 mlog_errno(ret);
5689 break;
5690 }
5691 }
5692
5693 if (ctxt.meta_ac)
5694 ocfs2_free_alloc_context(ctxt.meta_ac);
5695 ocfs2_schedule_truncate_log_flush(osb, 1);
5696 ocfs2_run_deallocs(osb, &ctxt.dealloc);
5697 return ret;
5698 }
5699
5700 /*
5701 * Whenever we modify a xattr value root in the bucket(e.g, CoW
5702 * or change the extent record flag), we need to recalculate
5703 * the metaecc for the whole bucket. So it is done here.
5704 *
5705 * Note:
5706 * We have to give the extra credits for the caller.
5707 */
5708 static int ocfs2_xattr_bucket_post_refcount(struct inode *inode,
5709 handle_t *handle,
5710 void *para)
5711 {
5712 int ret;
5713 struct ocfs2_xattr_bucket *bucket =
5714 (struct ocfs2_xattr_bucket *)para;
5715
5716 ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
5717 OCFS2_JOURNAL_ACCESS_WRITE);
5718 if (ret) {
5719 mlog_errno(ret);
5720 return ret;
5721 }
5722
5723 ocfs2_xattr_bucket_journal_dirty(handle, bucket);
5724
5725 return 0;
5726 }
5727
5728 /*
5729 * Special action we need if the xattr value is refcounted.
5730 *
5731 * 1. If the xattr is refcounted, lock the tree.
5732 * 2. CoW the xattr if we are setting the new value and the value
5733 * will be stored outside.
5734 * 3. In other case, decrease_refcount will work for us, so just
5735 * lock the refcount tree, calculate the meta and credits is OK.
5736 *
5737 * We have to do CoW before ocfs2_init_xattr_set_ctxt since
5738 * currently CoW is a completed transaction, while this function
5739 * will also lock the allocators and let us deadlock. So we will
5740 * CoW the whole xattr value.
5741 */
5742 static int ocfs2_prepare_refcount_xattr(struct inode *inode,
5743 struct ocfs2_dinode *di,
5744 struct ocfs2_xattr_info *xi,
5745 struct ocfs2_xattr_search *xis,
5746 struct ocfs2_xattr_search *xbs,
5747 struct ocfs2_refcount_tree **ref_tree,
5748 int *meta_add,
5749 int *credits)
5750 {
5751 int ret = 0;
5752 struct ocfs2_xattr_block *xb;
5753 struct ocfs2_xattr_entry *xe;
5754 char *base;
5755 u32 p_cluster, num_clusters;
5756 unsigned int ext_flags;
5757 int name_offset, name_len;
5758 struct ocfs2_xattr_value_buf vb;
5759 struct ocfs2_xattr_bucket *bucket = NULL;
5760 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5761 struct ocfs2_post_refcount refcount;
5762 struct ocfs2_post_refcount *p = NULL;
5763 struct buffer_head *ref_root_bh = NULL;
5764
5765 if (!xis->not_found) {
5766 xe = xis->here;
5767 name_offset = le16_to_cpu(xe->xe_name_offset);
5768 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5769 base = xis->base;
5770 vb.vb_bh = xis->inode_bh;
5771 vb.vb_access = ocfs2_journal_access_di;
5772 } else {
5773 int i, block_off = 0;
5774 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
5775 xe = xbs->here;
5776 name_offset = le16_to_cpu(xe->xe_name_offset);
5777 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5778 i = xbs->here - xbs->header->xh_entries;
5779
5780 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
5781 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
5782 bucket_xh(xbs->bucket),
5783 i, &block_off,
5784 &name_offset);
5785 if (ret) {
5786 mlog_errno(ret);
5787 goto out;
5788 }
5789 base = bucket_block(xbs->bucket, block_off);
5790 vb.vb_bh = xbs->bucket->bu_bhs[block_off];
5791 vb.vb_access = ocfs2_journal_access;
5792
5793 if (ocfs2_meta_ecc(osb)) {
5794 /*create parameters for ocfs2_post_refcount. */
5795 bucket = xbs->bucket;
5796 refcount.credits = bucket->bu_blocks;
5797 refcount.para = bucket;
5798 refcount.func =
5799 ocfs2_xattr_bucket_post_refcount;
5800 p = &refcount;
5801 }
5802 } else {
5803 base = xbs->base;
5804 vb.vb_bh = xbs->xattr_bh;
5805 vb.vb_access = ocfs2_journal_access_xb;
5806 }
5807 }
5808
5809 if (ocfs2_xattr_is_local(xe))
5810 goto out;
5811
5812 vb.vb_xv = (struct ocfs2_xattr_value_root *)
5813 (base + name_offset + name_len);
5814
5815 ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
5816 &num_clusters, &vb.vb_xv->xr_list,
5817 &ext_flags);
5818 if (ret) {
5819 mlog_errno(ret);
5820 goto out;
5821 }
5822
5823 /*
5824 * We just need to check the 1st extent record, since we always
5825 * CoW the whole xattr. So there shouldn't be a xattr with
5826 * some REFCOUNT extent recs after the 1st one.
5827 */
5828 if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
5829 goto out;
5830
5831 ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
5832 1, ref_tree, &ref_root_bh);
5833 if (ret) {
5834 mlog_errno(ret);
5835 goto out;
5836 }
5837
5838 /*
5839 * If we are deleting the xattr or the new size will be stored inside,
5840 * cool, leave it there, the xattr truncate process will remove them
5841 * for us(it still needs the refcount tree lock and the meta, credits).
5842 * And the worse case is that every cluster truncate will split the
5843 * refcount tree, and make the original extent become 3. So we will need
5844 * 2 * cluster more extent recs at most.
5845 */
5846 if (!xi->xi_value || xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE) {
5847
5848 ret = ocfs2_refcounted_xattr_delete_need(inode,
5849 &(*ref_tree)->rf_ci,
5850 ref_root_bh, vb.vb_xv,
5851 meta_add, credits);
5852 if (ret)
5853 mlog_errno(ret);
5854 goto out;
5855 }
5856
5857 ret = ocfs2_refcount_cow_xattr(inode, di, &vb,
5858 *ref_tree, ref_root_bh, 0,
5859 le32_to_cpu(vb.vb_xv->xr_clusters), p);
5860 if (ret)
5861 mlog_errno(ret);
5862
5863 out:
5864 brelse(ref_root_bh);
5865 return ret;
5866 }
5867
5868 /*
5869 * Add the REFCOUNTED flags for all the extent rec in ocfs2_xattr_value_root.
5870 * The physical clusters will be added to refcount tree.
5871 */
5872 static int ocfs2_xattr_value_attach_refcount(struct inode *inode,
5873 struct ocfs2_xattr_value_root *xv,
5874 struct ocfs2_extent_tree *value_et,
5875 struct ocfs2_caching_info *ref_ci,
5876 struct buffer_head *ref_root_bh,
5877 struct ocfs2_cached_dealloc_ctxt *dealloc,
5878 struct ocfs2_post_refcount *refcount)
5879 {
5880 int ret = 0;
5881 u32 clusters = le32_to_cpu(xv->xr_clusters);
5882 u32 cpos, p_cluster, num_clusters;
5883 struct ocfs2_extent_list *el = &xv->xr_list;
5884 unsigned int ext_flags;
5885
5886 cpos = 0;
5887 while (cpos < clusters) {
5888 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
5889 &num_clusters, el, &ext_flags);
5890
5891 cpos += num_clusters;
5892 if ((ext_flags & OCFS2_EXT_REFCOUNTED))
5893 continue;
5894
5895 BUG_ON(!p_cluster);
5896
5897 ret = ocfs2_add_refcount_flag(inode, value_et,
5898 ref_ci, ref_root_bh,
5899 cpos - num_clusters,
5900 p_cluster, num_clusters,
5901 dealloc, refcount);
5902 if (ret) {
5903 mlog_errno(ret);
5904 break;
5905 }
5906 }
5907
5908 return ret;
5909 }
5910
5911 /*
5912 * Given a normal ocfs2_xattr_header, refcount all the entries which
5913 * have value stored outside.
5914 * Used for xattrs stored in inode and ocfs2_xattr_block.
5915 */
5916 static int ocfs2_xattr_attach_refcount_normal(struct inode *inode,
5917 struct ocfs2_xattr_value_buf *vb,
5918 struct ocfs2_xattr_header *header,
5919 struct ocfs2_caching_info *ref_ci,
5920 struct buffer_head *ref_root_bh,
5921 struct ocfs2_cached_dealloc_ctxt *dealloc)
5922 {
5923
5924 struct ocfs2_xattr_entry *xe;
5925 struct ocfs2_xattr_value_root *xv;
5926 struct ocfs2_extent_tree et;
5927 int i, ret = 0;
5928
5929 for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
5930 xe = &header->xh_entries[i];
5931
5932 if (ocfs2_xattr_is_local(xe))
5933 continue;
5934
5935 xv = (struct ocfs2_xattr_value_root *)((void *)header +
5936 le16_to_cpu(xe->xe_name_offset) +
5937 OCFS2_XATTR_SIZE(xe->xe_name_len));
5938
5939 vb->vb_xv = xv;
5940 ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
5941
5942 ret = ocfs2_xattr_value_attach_refcount(inode, xv, &et,
5943 ref_ci, ref_root_bh,
5944 dealloc, NULL);
5945 if (ret) {
5946 mlog_errno(ret);
5947 break;
5948 }
5949 }
5950
5951 return ret;
5952 }
5953
5954 static int ocfs2_xattr_inline_attach_refcount(struct inode *inode,
5955 struct buffer_head *fe_bh,
5956 struct ocfs2_caching_info *ref_ci,
5957 struct buffer_head *ref_root_bh,
5958 struct ocfs2_cached_dealloc_ctxt *dealloc)
5959 {
5960 struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
5961 struct ocfs2_xattr_header *header = (struct ocfs2_xattr_header *)
5962 (fe_bh->b_data + inode->i_sb->s_blocksize -
5963 le16_to_cpu(di->i_xattr_inline_size));
5964 struct ocfs2_xattr_value_buf vb = {
5965 .vb_bh = fe_bh,
5966 .vb_access = ocfs2_journal_access_di,
5967 };
5968
5969 return ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
5970 ref_ci, ref_root_bh, dealloc);
5971 }
5972
5973 struct ocfs2_xattr_tree_value_refcount_para {
5974 struct ocfs2_caching_info *ref_ci;
5975 struct buffer_head *ref_root_bh;
5976 struct ocfs2_cached_dealloc_ctxt *dealloc;
5977 };
5978
5979 static int ocfs2_get_xattr_tree_value_root(struct super_block *sb,
5980 struct ocfs2_xattr_bucket *bucket,
5981 int offset,
5982 struct ocfs2_xattr_value_root **xv,
5983 struct buffer_head **bh)
5984 {
5985 int ret, block_off, name_offset;
5986 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5987 struct ocfs2_xattr_entry *xe = &xh->xh_entries[offset];
5988 void *base;
5989
5990 ret = ocfs2_xattr_bucket_get_name_value(sb,
5991 bucket_xh(bucket),
5992 offset,
5993 &block_off,
5994 &name_offset);
5995 if (ret) {
5996 mlog_errno(ret);
5997 goto out;
5998 }
5999
6000 base = bucket_block(bucket, block_off);
6001
6002 *xv = (struct ocfs2_xattr_value_root *)(base + name_offset +
6003 OCFS2_XATTR_SIZE(xe->xe_name_len));
6004
6005 if (bh)
6006 *bh = bucket->bu_bhs[block_off];
6007 out:
6008 return ret;
6009 }
6010
6011 /*
6012 * For a given xattr bucket, refcount all the entries which
6013 * have value stored outside.
6014 */
6015 static int ocfs2_xattr_bucket_value_refcount(struct inode *inode,
6016 struct ocfs2_xattr_bucket *bucket,
6017 void *para)
6018 {
6019 int i, ret = 0;
6020 struct ocfs2_extent_tree et;
6021 struct ocfs2_xattr_tree_value_refcount_para *ref =
6022 (struct ocfs2_xattr_tree_value_refcount_para *)para;
6023 struct ocfs2_xattr_header *xh =
6024 (struct ocfs2_xattr_header *)bucket->bu_bhs[0]->b_data;
6025 struct ocfs2_xattr_entry *xe;
6026 struct ocfs2_xattr_value_buf vb = {
6027 .vb_access = ocfs2_journal_access,
6028 };
6029 struct ocfs2_post_refcount refcount = {
6030 .credits = bucket->bu_blocks,
6031 .para = bucket,
6032 .func = ocfs2_xattr_bucket_post_refcount,
6033 };
6034 struct ocfs2_post_refcount *p = NULL;
6035
6036 /* We only need post_refcount if we support metaecc. */
6037 if (ocfs2_meta_ecc(OCFS2_SB(inode->i_sb)))
6038 p = &refcount;
6039
6040 trace_ocfs2_xattr_bucket_value_refcount(
6041 (unsigned long long)bucket_blkno(bucket),
6042 le16_to_cpu(xh->xh_count));
6043 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
6044 xe = &xh->xh_entries[i];
6045
6046 if (ocfs2_xattr_is_local(xe))
6047 continue;
6048
6049 ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket, i,
6050 &vb.vb_xv, &vb.vb_bh);
6051 if (ret) {
6052 mlog_errno(ret);
6053 break;
6054 }
6055
6056 ocfs2_init_xattr_value_extent_tree(&et,
6057 INODE_CACHE(inode), &vb);
6058
6059 ret = ocfs2_xattr_value_attach_refcount(inode, vb.vb_xv,
6060 &et, ref->ref_ci,
6061 ref->ref_root_bh,
6062 ref->dealloc, p);
6063 if (ret) {
6064 mlog_errno(ret);
6065 break;
6066 }
6067 }
6068
6069 return ret;
6070
6071 }
6072
6073 static int ocfs2_refcount_xattr_tree_rec(struct inode *inode,
6074 struct buffer_head *root_bh,
6075 u64 blkno, u32 cpos, u32 len, void *para)
6076 {
6077 return ocfs2_iterate_xattr_buckets(inode, blkno, len,
6078 ocfs2_xattr_bucket_value_refcount,
6079 para);
6080 }
6081
6082 static int ocfs2_xattr_block_attach_refcount(struct inode *inode,
6083 struct buffer_head *blk_bh,
6084 struct ocfs2_caching_info *ref_ci,
6085 struct buffer_head *ref_root_bh,
6086 struct ocfs2_cached_dealloc_ctxt *dealloc)
6087 {
6088 int ret = 0;
6089 struct ocfs2_xattr_block *xb =
6090 (struct ocfs2_xattr_block *)blk_bh->b_data;
6091
6092 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
6093 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
6094 struct ocfs2_xattr_value_buf vb = {
6095 .vb_bh = blk_bh,
6096 .vb_access = ocfs2_journal_access_xb,
6097 };
6098
6099 ret = ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
6100 ref_ci, ref_root_bh,
6101 dealloc);
6102 } else {
6103 struct ocfs2_xattr_tree_value_refcount_para para = {
6104 .ref_ci = ref_ci,
6105 .ref_root_bh = ref_root_bh,
6106 .dealloc = dealloc,
6107 };
6108
6109 ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
6110 ocfs2_refcount_xattr_tree_rec,
6111 &para);
6112 }
6113
6114 return ret;
6115 }
6116
6117 int ocfs2_xattr_attach_refcount_tree(struct inode *inode,
6118 struct buffer_head *fe_bh,
6119 struct ocfs2_caching_info *ref_ci,
6120 struct buffer_head *ref_root_bh,
6121 struct ocfs2_cached_dealloc_ctxt *dealloc)
6122 {
6123 int ret = 0;
6124 struct ocfs2_inode_info *oi = OCFS2_I(inode);
6125 struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
6126 struct buffer_head *blk_bh = NULL;
6127
6128 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
6129 ret = ocfs2_xattr_inline_attach_refcount(inode, fe_bh,
6130 ref_ci, ref_root_bh,
6131 dealloc);
6132 if (ret) {
6133 mlog_errno(ret);
6134 goto out;
6135 }
6136 }
6137
6138 if (!di->i_xattr_loc)
6139 goto out;
6140
6141 ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
6142 &blk_bh);
6143 if (ret < 0) {
6144 mlog_errno(ret);
6145 goto out;
6146 }
6147
6148 ret = ocfs2_xattr_block_attach_refcount(inode, blk_bh, ref_ci,
6149 ref_root_bh, dealloc);
6150 if (ret)
6151 mlog_errno(ret);
6152
6153 brelse(blk_bh);
6154 out:
6155
6156 return ret;
6157 }
6158
6159 typedef int (should_xattr_reflinked)(struct ocfs2_xattr_entry *xe);
6160 /*
6161 * Store the information we need in xattr reflink.
6162 * old_bh and new_bh are inode bh for the old and new inode.
6163 */
6164 struct ocfs2_xattr_reflink {
6165 struct inode *old_inode;
6166 struct inode *new_inode;
6167 struct buffer_head *old_bh;
6168 struct buffer_head *new_bh;
6169 struct ocfs2_caching_info *ref_ci;
6170 struct buffer_head *ref_root_bh;
6171 struct ocfs2_cached_dealloc_ctxt *dealloc;
6172 should_xattr_reflinked *xattr_reflinked;
6173 };
6174
6175 /*
6176 * Given a xattr header and xe offset,
6177 * return the proper xv and the corresponding bh.
6178 * xattr in inode, block and xattr tree have different implementaions.
6179 */
6180 typedef int (get_xattr_value_root)(struct super_block *sb,
6181 struct buffer_head *bh,
6182 struct ocfs2_xattr_header *xh,
6183 int offset,
6184 struct ocfs2_xattr_value_root **xv,
6185 struct buffer_head **ret_bh,
6186 void *para);
6187
6188 /*
6189 * Calculate all the xattr value root metadata stored in this xattr header and
6190 * credits we need if we create them from the scratch.
6191 * We use get_xattr_value_root so that all types of xattr container can use it.
6192 */
6193 static int ocfs2_value_metas_in_xattr_header(struct super_block *sb,
6194 struct buffer_head *bh,
6195 struct ocfs2_xattr_header *xh,
6196 int *metas, int *credits,
6197 int *num_recs,
6198 get_xattr_value_root *func,
6199 void *para)
6200 {
6201 int i, ret = 0;
6202 struct ocfs2_xattr_value_root *xv;
6203 struct ocfs2_xattr_entry *xe;
6204
6205 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
6206 xe = &xh->xh_entries[i];
6207 if (ocfs2_xattr_is_local(xe))
6208 continue;
6209
6210 ret = func(sb, bh, xh, i, &xv, NULL, para);
6211 if (ret) {
6212 mlog_errno(ret);
6213 break;
6214 }
6215
6216 *metas += le16_to_cpu(xv->xr_list.l_tree_depth) *
6217 le16_to_cpu(xv->xr_list.l_next_free_rec);
6218
6219 *credits += ocfs2_calc_extend_credits(sb,
6220 &def_xv.xv.xr_list,
6221 le32_to_cpu(xv->xr_clusters));
6222
6223 /*
6224 * If the value is a tree with depth > 1, We don't go deep
6225 * to the extent block, so just calculate a maximum record num.
6226 */
6227 if (!xv->xr_list.l_tree_depth)
6228 *num_recs += le16_to_cpu(xv->xr_list.l_next_free_rec);
6229 else
6230 *num_recs += ocfs2_clusters_for_bytes(sb,
6231 XATTR_SIZE_MAX);
6232 }
6233
6234 return ret;
6235 }
6236
6237 /* Used by xattr inode and block to return the right xv and buffer_head. */
6238 static int ocfs2_get_xattr_value_root(struct super_block *sb,
6239 struct buffer_head *bh,
6240 struct ocfs2_xattr_header *xh,
6241 int offset,
6242 struct ocfs2_xattr_value_root **xv,
6243 struct buffer_head **ret_bh,
6244 void *para)
6245 {
6246 struct ocfs2_xattr_entry *xe = &xh->xh_entries[offset];
6247
6248 *xv = (struct ocfs2_xattr_value_root *)((void *)xh +
6249 le16_to_cpu(xe->xe_name_offset) +
6250 OCFS2_XATTR_SIZE(xe->xe_name_len));
6251
6252 if (ret_bh)
6253 *ret_bh = bh;
6254
6255 return 0;
6256 }
6257
6258 /*
6259 * Lock the meta_ac and caculate how much credits we need for reflink xattrs.
6260 * It is only used for inline xattr and xattr block.
6261 */
6262 static int ocfs2_reflink_lock_xattr_allocators(struct ocfs2_super *osb,
6263 struct ocfs2_xattr_header *xh,
6264 struct buffer_head *ref_root_bh,
6265 int *credits,
6266 struct ocfs2_alloc_context **meta_ac)
6267 {
6268 int ret, meta_add = 0, num_recs = 0;
6269 struct ocfs2_refcount_block *rb =
6270 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
6271
6272 *credits = 0;
6273
6274 ret = ocfs2_value_metas_in_xattr_header(osb->sb, NULL, xh,
6275 &meta_add, credits, &num_recs,
6276 ocfs2_get_xattr_value_root,
6277 NULL);
6278 if (ret) {
6279 mlog_errno(ret);
6280 goto out;
6281 }
6282
6283 /*
6284 * We need to add/modify num_recs in refcount tree, so just calculate
6285 * an approximate number we need for refcount tree change.
6286 * Sometimes we need to split the tree, and after split, half recs
6287 * will be moved to the new block, and a new block can only provide
6288 * half number of recs. So we multiple new blocks by 2.
6289 */
6290 num_recs = num_recs / ocfs2_refcount_recs_per_rb(osb->sb) * 2;
6291 meta_add += num_recs;
6292 *credits += num_recs + num_recs * OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
6293 if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
6294 *credits += le16_to_cpu(rb->rf_list.l_tree_depth) *
6295 le16_to_cpu(rb->rf_list.l_next_free_rec) + 1;
6296 else
6297 *credits += 1;
6298
6299 ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add, meta_ac);
6300 if (ret)
6301 mlog_errno(ret);
6302
6303 out:
6304 return ret;
6305 }
6306
6307 /*
6308 * Given a xattr header, reflink all the xattrs in this container.
6309 * It can be used for inode, block and bucket.
6310 *
6311 * NOTE:
6312 * Before we call this function, the caller has memcpy the xattr in
6313 * old_xh to the new_xh.
6314 *
6315 * If args.xattr_reflinked is set, call it to decide whether the xe should
6316 * be reflinked or not. If not, remove it from the new xattr header.
6317 */
6318 static int ocfs2_reflink_xattr_header(handle_t *handle,
6319 struct ocfs2_xattr_reflink *args,
6320 struct buffer_head *old_bh,
6321 struct ocfs2_xattr_header *xh,
6322 struct buffer_head *new_bh,
6323 struct ocfs2_xattr_header *new_xh,
6324 struct ocfs2_xattr_value_buf *vb,
6325 struct ocfs2_alloc_context *meta_ac,
6326 get_xattr_value_root *func,
6327 void *para)
6328 {
6329 int ret = 0, i, j;
6330 struct super_block *sb = args->old_inode->i_sb;
6331 struct buffer_head *value_bh;
6332 struct ocfs2_xattr_entry *xe, *last;
6333 struct ocfs2_xattr_value_root *xv, *new_xv;
6334 struct ocfs2_extent_tree data_et;
6335 u32 clusters, cpos, p_cluster, num_clusters;
6336 unsigned int ext_flags = 0;
6337
6338 trace_ocfs2_reflink_xattr_header((unsigned long long)old_bh->b_blocknr,
6339 le16_to_cpu(xh->xh_count));
6340
6341 last = &new_xh->xh_entries[le16_to_cpu(new_xh->xh_count)];
6342 for (i = 0, j = 0; i < le16_to_cpu(xh->xh_count); i++, j++) {
6343 xe = &xh->xh_entries[i];
6344
6345 if (args->xattr_reflinked && !args->xattr_reflinked(xe)) {
6346 xe = &new_xh->xh_entries[j];
6347
6348 le16_add_cpu(&new_xh->xh_count, -1);
6349 if (new_xh->xh_count) {
6350 memmove(xe, xe + 1,
6351 (void *)last - (void *)xe);
6352 memset(last, 0,
6353 sizeof(struct ocfs2_xattr_entry));
6354 }
6355
6356 /*
6357 * We don't want j to increase in the next round since
6358 * it is already moved ahead.
6359 */
6360 j--;
6361 continue;
6362 }
6363
6364 if (ocfs2_xattr_is_local(xe))
6365 continue;
6366
6367 ret = func(sb, old_bh, xh, i, &xv, NULL, para);
6368 if (ret) {
6369 mlog_errno(ret);
6370 break;
6371 }
6372
6373 ret = func(sb, new_bh, new_xh, j, &new_xv, &value_bh, para);
6374 if (ret) {
6375 mlog_errno(ret);
6376 break;
6377 }
6378
6379 /*
6380 * For the xattr which has l_tree_depth = 0, all the extent
6381 * recs have already be copied to the new xh with the
6382 * propriate OCFS2_EXT_REFCOUNTED flag we just need to
6383 * increase the refount count int the refcount tree.
6384 *
6385 * For the xattr which has l_tree_depth > 0, we need
6386 * to initialize it to the empty default value root,
6387 * and then insert the extents one by one.
6388 */
6389 if (xv->xr_list.l_tree_depth) {
6390 memcpy(new_xv, &def_xv, sizeof(def_xv));
6391 vb->vb_xv = new_xv;
6392 vb->vb_bh = value_bh;
6393 ocfs2_init_xattr_value_extent_tree(&data_et,
6394 INODE_CACHE(args->new_inode), vb);
6395 }
6396
6397 clusters = le32_to_cpu(xv->xr_clusters);
6398 cpos = 0;
6399 while (cpos < clusters) {
6400 ret = ocfs2_xattr_get_clusters(args->old_inode,
6401 cpos,
6402 &p_cluster,
6403 &num_clusters,
6404 &xv->xr_list,
6405 &ext_flags);
6406 if (ret) {
6407 mlog_errno(ret);
6408 goto out;
6409 }
6410
6411 BUG_ON(!p_cluster);
6412
6413 if (xv->xr_list.l_tree_depth) {
6414 ret = ocfs2_insert_extent(handle,
6415 &data_et, cpos,
6416 ocfs2_clusters_to_blocks(
6417 args->old_inode->i_sb,
6418 p_cluster),
6419 num_clusters, ext_flags,
6420 meta_ac);
6421 if (ret) {
6422 mlog_errno(ret);
6423 goto out;
6424 }
6425 }
6426
6427 ret = ocfs2_increase_refcount(handle, args->ref_ci,
6428 args->ref_root_bh,
6429 p_cluster, num_clusters,
6430 meta_ac, args->dealloc);
6431 if (ret) {
6432 mlog_errno(ret);
6433 goto out;
6434 }
6435
6436 cpos += num_clusters;
6437 }
6438 }
6439
6440 out:
6441 return ret;
6442 }
6443
6444 static int ocfs2_reflink_xattr_inline(struct ocfs2_xattr_reflink *args)
6445 {
6446 int ret = 0, credits = 0;
6447 handle_t *handle;
6448 struct ocfs2_super *osb = OCFS2_SB(args->old_inode->i_sb);
6449 struct ocfs2_dinode *di = (struct ocfs2_dinode *)args->old_bh->b_data;
6450 int inline_size = le16_to_cpu(di->i_xattr_inline_size);
6451 int header_off = osb->sb->s_blocksize - inline_size;
6452 struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)
6453 (args->old_bh->b_data + header_off);
6454 struct ocfs2_xattr_header *new_xh = (struct ocfs2_xattr_header *)
6455 (args->new_bh->b_data + header_off);
6456 struct ocfs2_alloc_context *meta_ac = NULL;
6457 struct ocfs2_inode_info *new_oi;
6458 struct ocfs2_dinode *new_di;
6459 struct ocfs2_xattr_value_buf vb = {
6460 .vb_bh = args->new_bh,
6461 .vb_access = ocfs2_journal_access_di,
6462 };
6463
6464 ret = ocfs2_reflink_lock_xattr_allocators(osb, xh, args->ref_root_bh,
6465 &credits, &meta_ac);
6466 if (ret) {
6467 mlog_errno(ret);
6468 goto out;
6469 }
6470
6471 handle = ocfs2_start_trans(osb, credits);
6472 if (IS_ERR(handle)) {
6473 ret = PTR_ERR(handle);
6474 mlog_errno(ret);
6475 goto out;
6476 }
6477
6478 ret = ocfs2_journal_access_di(handle, INODE_CACHE(args->new_inode),
6479 args->new_bh, OCFS2_JOURNAL_ACCESS_WRITE);
6480 if (ret) {
6481 mlog_errno(ret);
6482 goto out_commit;
6483 }
6484
6485 memcpy(args->new_bh->b_data + header_off,
6486 args->old_bh->b_data + header_off, inline_size);
6487
6488 new_di = (struct ocfs2_dinode *)args->new_bh->b_data;
6489 new_di->i_xattr_inline_size = cpu_to_le16(inline_size);
6490
6491 ret = ocfs2_reflink_xattr_header(handle, args, args->old_bh, xh,
6492 args->new_bh, new_xh, &vb, meta_ac,
6493 ocfs2_get_xattr_value_root, NULL);
6494 if (ret) {
6495 mlog_errno(ret);
6496 goto out_commit;
6497 }
6498
6499 new_oi = OCFS2_I(args->new_inode);
6500 spin_lock(&new_oi->ip_lock);
6501 new_oi->ip_dyn_features |= OCFS2_HAS_XATTR_FL | OCFS2_INLINE_XATTR_FL;
6502 new_di->i_dyn_features = cpu_to_le16(new_oi->ip_dyn_features);
6503 spin_unlock(&new_oi->ip_lock);
6504
6505 ocfs2_journal_dirty(handle, args->new_bh);
6506
6507 out_commit:
6508 ocfs2_commit_trans(osb, handle);
6509
6510 out:
6511 if (meta_ac)
6512 ocfs2_free_alloc_context(meta_ac);
6513 return ret;
6514 }
6515
6516 static int ocfs2_create_empty_xattr_block(struct inode *inode,
6517 struct buffer_head *fe_bh,
6518 struct buffer_head **ret_bh,
6519 int indexed)
6520 {
6521 int ret;
6522 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
6523 struct ocfs2_xattr_set_ctxt ctxt;
6524
6525 memset(&ctxt, 0, sizeof(ctxt));
6526 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &ctxt.meta_ac);
6527 if (ret < 0) {
6528 mlog_errno(ret);
6529 return ret;
6530 }
6531
6532 ctxt.handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_CREATE_CREDITS);
6533 if (IS_ERR(ctxt.handle)) {
6534 ret = PTR_ERR(ctxt.handle);
6535 mlog_errno(ret);
6536 goto out;
6537 }
6538
6539 trace_ocfs2_create_empty_xattr_block(
6540 (unsigned long long)fe_bh->b_blocknr, indexed);
6541 ret = ocfs2_create_xattr_block(inode, fe_bh, &ctxt, indexed,
6542 ret_bh);
6543 if (ret)
6544 mlog_errno(ret);
6545
6546 ocfs2_commit_trans(osb, ctxt.handle);
6547 out:
6548 ocfs2_free_alloc_context(ctxt.meta_ac);
6549 return ret;
6550 }
6551
6552 static int ocfs2_reflink_xattr_block(struct ocfs2_xattr_reflink *args,
6553 struct buffer_head *blk_bh,
6554 struct buffer_head *new_blk_bh)
6555 {
6556 int ret = 0, credits = 0;
6557 handle_t *handle;
6558 struct ocfs2_inode_info *new_oi = OCFS2_I(args->new_inode);
6559 struct ocfs2_dinode *new_di;
6560 struct ocfs2_super *osb = OCFS2_SB(args->new_inode->i_sb);
6561 int header_off = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
6562 struct ocfs2_xattr_block *xb =
6563 (struct ocfs2_xattr_block *)blk_bh->b_data;
6564 struct ocfs2_xattr_header *xh = &xb->xb_attrs.xb_header;
6565 struct ocfs2_xattr_block *new_xb =
6566 (struct ocfs2_xattr_block *)new_blk_bh->b_data;
6567 struct ocfs2_xattr_header *new_xh = &new_xb->xb_attrs.xb_header;
6568 struct ocfs2_alloc_context *meta_ac;
6569 struct ocfs2_xattr_value_buf vb = {
6570 .vb_bh = new_blk_bh,
6571 .vb_access = ocfs2_journal_access_xb,
6572 };
6573
6574 ret = ocfs2_reflink_lock_xattr_allocators(osb, xh, args->ref_root_bh,
6575 &credits, &meta_ac);
6576 if (ret) {
6577 mlog_errno(ret);
6578 return ret;
6579 }
6580
6581 /* One more credits in case we need to add xattr flags in new inode. */
6582 handle = ocfs2_start_trans(osb, credits + 1);
6583 if (IS_ERR(handle)) {
6584 ret = PTR_ERR(handle);
6585 mlog_errno(ret);
6586 goto out;
6587 }
6588
6589 if (!(new_oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) {
6590 ret = ocfs2_journal_access_di(handle,
6591 INODE_CACHE(args->new_inode),
6592 args->new_bh,
6593 OCFS2_JOURNAL_ACCESS_WRITE);
6594 if (ret) {
6595 mlog_errno(ret);
6596 goto out_commit;
6597 }
6598 }
6599
6600 ret = ocfs2_journal_access_xb(handle, INODE_CACHE(args->new_inode),
6601 new_blk_bh, OCFS2_JOURNAL_ACCESS_WRITE);
6602 if (ret) {
6603 mlog_errno(ret);
6604 goto out_commit;
6605 }
6606
6607 memcpy(new_blk_bh->b_data + header_off, blk_bh->b_data + header_off,
6608 osb->sb->s_blocksize - header_off);
6609
6610 ret = ocfs2_reflink_xattr_header(handle, args, blk_bh, xh,
6611 new_blk_bh, new_xh, &vb, meta_ac,
6612 ocfs2_get_xattr_value_root, NULL);
6613 if (ret) {
6614 mlog_errno(ret);
6615 goto out_commit;
6616 }
6617
6618 ocfs2_journal_dirty(handle, new_blk_bh);
6619
6620 if (!(new_oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) {
6621 new_di = (struct ocfs2_dinode *)args->new_bh->b_data;
6622 spin_lock(&new_oi->ip_lock);
6623 new_oi->ip_dyn_features |= OCFS2_HAS_XATTR_FL;
6624 new_di->i_dyn_features = cpu_to_le16(new_oi->ip_dyn_features);
6625 spin_unlock(&new_oi->ip_lock);
6626
6627 ocfs2_journal_dirty(handle, args->new_bh);
6628 }
6629
6630 out_commit:
6631 ocfs2_commit_trans(osb, handle);
6632
6633 out:
6634 ocfs2_free_alloc_context(meta_ac);
6635 return ret;
6636 }
6637
6638 struct ocfs2_reflink_xattr_tree_args {
6639 struct ocfs2_xattr_reflink *reflink;
6640 struct buffer_head *old_blk_bh;
6641 struct buffer_head *new_blk_bh;
6642 struct ocfs2_xattr_bucket *old_bucket;
6643 struct ocfs2_xattr_bucket *new_bucket;
6644 };
6645
6646 /*
6647 * NOTE:
6648 * We have to handle the case that both old bucket and new bucket
6649 * will call this function to get the right ret_bh.
6650 * So The caller must give us the right bh.
6651 */
6652 static int ocfs2_get_reflink_xattr_value_root(struct super_block *sb,
6653 struct buffer_head *bh,
6654 struct ocfs2_xattr_header *xh,
6655 int offset,
6656 struct ocfs2_xattr_value_root **xv,
6657 struct buffer_head **ret_bh,
6658 void *para)
6659 {
6660 struct ocfs2_reflink_xattr_tree_args *args =
6661 (struct ocfs2_reflink_xattr_tree_args *)para;
6662 struct ocfs2_xattr_bucket *bucket;
6663
6664 if (bh == args->old_bucket->bu_bhs[0])
6665 bucket = args->old_bucket;
6666 else
6667 bucket = args->new_bucket;
6668
6669 return ocfs2_get_xattr_tree_value_root(sb, bucket, offset,
6670 xv, ret_bh);
6671 }
6672
6673 struct ocfs2_value_tree_metas {
6674 int num_metas;
6675 int credits;
6676 int num_recs;
6677 };
6678
6679 static int ocfs2_value_tree_metas_in_bucket(struct super_block *sb,
6680 struct buffer_head *bh,
6681 struct ocfs2_xattr_header *xh,
6682 int offset,
6683 struct ocfs2_xattr_value_root **xv,
6684 struct buffer_head **ret_bh,
6685 void *para)
6686 {
6687 struct ocfs2_xattr_bucket *bucket =
6688 (struct ocfs2_xattr_bucket *)para;
6689
6690 return ocfs2_get_xattr_tree_value_root(sb, bucket, offset,
6691 xv, ret_bh);
6692 }
6693
6694 static int ocfs2_calc_value_tree_metas(struct inode *inode,
6695 struct ocfs2_xattr_bucket *bucket,
6696 void *para)
6697 {
6698 struct ocfs2_value_tree_metas *metas =
6699 (struct ocfs2_value_tree_metas *)para;
6700 struct ocfs2_xattr_header *xh =
6701 (struct ocfs2_xattr_header *)bucket->bu_bhs[0]->b_data;
6702
6703 /* Add the credits for this bucket first. */
6704 metas->credits += bucket->bu_blocks;
6705 return ocfs2_value_metas_in_xattr_header(inode->i_sb, bucket->bu_bhs[0],
6706 xh, &metas->num_metas,
6707 &metas->credits, &metas->num_recs,
6708 ocfs2_value_tree_metas_in_bucket,
6709 bucket);
6710 }
6711
6712 /*
6713 * Given a xattr extent rec starting from blkno and having len clusters,
6714 * iterate all the buckets calculate how much metadata we need for reflinking
6715 * all the ocfs2_xattr_value_root and lock the allocators accordingly.
6716 */
6717 static int ocfs2_lock_reflink_xattr_rec_allocators(
6718 struct ocfs2_reflink_xattr_tree_args *args,
6719 struct ocfs2_extent_tree *xt_et,
6720 u64 blkno, u32 len, int *credits,
6721 struct ocfs2_alloc_context **meta_ac,
6722 struct ocfs2_alloc_context **data_ac)
6723 {
6724 int ret, num_free_extents;
6725 struct ocfs2_value_tree_metas metas;
6726 struct ocfs2_super *osb = OCFS2_SB(args->reflink->old_inode->i_sb);
6727 struct ocfs2_refcount_block *rb;
6728
6729 memset(&metas, 0, sizeof(metas));
6730
6731 ret = ocfs2_iterate_xattr_buckets(args->reflink->old_inode, blkno, len,
6732 ocfs2_calc_value_tree_metas, &metas);
6733 if (ret) {
6734 mlog_errno(ret);
6735 goto out;
6736 }
6737
6738 *credits = metas.credits;
6739
6740 /*
6741 * Calculate we need for refcount tree change.
6742 *
6743 * We need to add/modify num_recs in refcount tree, so just calculate
6744 * an approximate number we need for refcount tree change.
6745 * Sometimes we need to split the tree, and after split, half recs
6746 * will be moved to the new block, and a new block can only provide
6747 * half number of recs. So we multiple new blocks by 2.
6748 * In the end, we have to add credits for modifying the already
6749 * existed refcount block.
6750 */
6751 rb = (struct ocfs2_refcount_block *)args->reflink->ref_root_bh->b_data;
6752 metas.num_recs =
6753 (metas.num_recs + ocfs2_refcount_recs_per_rb(osb->sb) - 1) /
6754 ocfs2_refcount_recs_per_rb(osb->sb) * 2;
6755 metas.num_metas += metas.num_recs;
6756 *credits += metas.num_recs +
6757 metas.num_recs * OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
6758 if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
6759 *credits += le16_to_cpu(rb->rf_list.l_tree_depth) *
6760 le16_to_cpu(rb->rf_list.l_next_free_rec) + 1;
6761 else
6762 *credits += 1;
6763
6764 /* count in the xattr tree change. */
6765 num_free_extents = ocfs2_num_free_extents(osb, xt_et);
6766 if (num_free_extents < 0) {
6767 ret = num_free_extents;
6768 mlog_errno(ret);
6769 goto out;
6770 }
6771
6772 if (num_free_extents < len)
6773 metas.num_metas += ocfs2_extend_meta_needed(xt_et->et_root_el);
6774
6775 *credits += ocfs2_calc_extend_credits(osb->sb,
6776 xt_et->et_root_el, len);
6777
6778 if (metas.num_metas) {
6779 ret = ocfs2_reserve_new_metadata_blocks(osb, metas.num_metas,
6780 meta_ac);
6781 if (ret) {
6782 mlog_errno(ret);
6783 goto out;
6784 }
6785 }
6786
6787 if (len) {
6788 ret = ocfs2_reserve_clusters(osb, len, data_ac);
6789 if (ret)
6790 mlog_errno(ret);
6791 }
6792 out:
6793 if (ret) {
6794 if (*meta_ac) {
6795 ocfs2_free_alloc_context(*meta_ac);
6796 meta_ac = NULL;
6797 }
6798 }
6799
6800 return ret;
6801 }
6802
6803 static int ocfs2_reflink_xattr_bucket(handle_t *handle,
6804 u64 blkno, u64 new_blkno, u32 clusters,
6805 u32 *cpos, int num_buckets,
6806 struct ocfs2_alloc_context *meta_ac,
6807 struct ocfs2_alloc_context *data_ac,
6808 struct ocfs2_reflink_xattr_tree_args *args)
6809 {
6810 int i, j, ret = 0;
6811 struct super_block *sb = args->reflink->old_inode->i_sb;
6812 int bpb = args->old_bucket->bu_blocks;
6813 struct ocfs2_xattr_value_buf vb = {
6814 .vb_access = ocfs2_journal_access,
6815 };
6816
6817 for (i = 0; i < num_buckets; i++, blkno += bpb, new_blkno += bpb) {
6818 ret = ocfs2_read_xattr_bucket(args->old_bucket, blkno);
6819 if (ret) {
6820 mlog_errno(ret);
6821 break;
6822 }
6823
6824 ret = ocfs2_init_xattr_bucket(args->new_bucket, new_blkno);
6825 if (ret) {
6826 mlog_errno(ret);
6827 break;
6828 }
6829
6830 ret = ocfs2_xattr_bucket_journal_access(handle,
6831 args->new_bucket,
6832 OCFS2_JOURNAL_ACCESS_CREATE);
6833 if (ret) {
6834 mlog_errno(ret);
6835 break;
6836 }
6837
6838 for (j = 0; j < bpb; j++)
6839 memcpy(bucket_block(args->new_bucket, j),
6840 bucket_block(args->old_bucket, j),
6841 sb->s_blocksize);
6842
6843 /*
6844 * Record the start cpos so that we can use it to initialize
6845 * our xattr tree we also set the xh_num_bucket for the new
6846 * bucket.
6847 */
6848 if (i == 0) {
6849 *cpos = le32_to_cpu(bucket_xh(args->new_bucket)->
6850 xh_entries[0].xe_name_hash);
6851 bucket_xh(args->new_bucket)->xh_num_buckets =
6852 cpu_to_le16(num_buckets);
6853 }
6854
6855 ocfs2_xattr_bucket_journal_dirty(handle, args->new_bucket);
6856
6857 ret = ocfs2_reflink_xattr_header(handle, args->reflink,
6858 args->old_bucket->bu_bhs[0],
6859 bucket_xh(args->old_bucket),
6860 args->new_bucket->bu_bhs[0],
6861 bucket_xh(args->new_bucket),
6862 &vb, meta_ac,
6863 ocfs2_get_reflink_xattr_value_root,
6864 args);
6865 if (ret) {
6866 mlog_errno(ret);
6867 break;
6868 }
6869
6870 /*
6871 * Re-access and dirty the bucket to calculate metaecc.
6872 * Because we may extend the transaction in reflink_xattr_header
6873 * which will let the already accessed block gone.
6874 */
6875 ret = ocfs2_xattr_bucket_journal_access(handle,
6876 args->new_bucket,
6877 OCFS2_JOURNAL_ACCESS_WRITE);
6878 if (ret) {
6879 mlog_errno(ret);
6880 break;
6881 }
6882
6883 ocfs2_xattr_bucket_journal_dirty(handle, args->new_bucket);
6884
6885 ocfs2_xattr_bucket_relse(args->old_bucket);
6886 ocfs2_xattr_bucket_relse(args->new_bucket);
6887 }
6888
6889 ocfs2_xattr_bucket_relse(args->old_bucket);
6890 ocfs2_xattr_bucket_relse(args->new_bucket);
6891 return ret;
6892 }
6893
6894 static int ocfs2_reflink_xattr_buckets(handle_t *handle,
6895 struct inode *inode,
6896 struct ocfs2_reflink_xattr_tree_args *args,
6897 struct ocfs2_extent_tree *et,
6898 struct ocfs2_alloc_context *meta_ac,
6899 struct ocfs2_alloc_context *data_ac,
6900 u64 blkno, u32 cpos, u32 len)
6901 {
6902 int ret, first_inserted = 0;
6903 u32 p_cluster, num_clusters, reflink_cpos = 0;
6904 u64 new_blkno;
6905 unsigned int num_buckets, reflink_buckets;
6906 unsigned int bpc =
6907 ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
6908
6909 ret = ocfs2_read_xattr_bucket(args->old_bucket, blkno);
6910 if (ret) {
6911 mlog_errno(ret);
6912 goto out;
6913 }
6914 num_buckets = le16_to_cpu(bucket_xh(args->old_bucket)->xh_num_buckets);
6915 ocfs2_xattr_bucket_relse(args->old_bucket);
6916
6917 while (len && num_buckets) {
6918 ret = ocfs2_claim_clusters(handle, data_ac,
6919 1, &p_cluster, &num_clusters);
6920 if (ret) {
6921 mlog_errno(ret);
6922 goto out;
6923 }
6924
6925 new_blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
6926 reflink_buckets = min(num_buckets, bpc * num_clusters);
6927
6928 ret = ocfs2_reflink_xattr_bucket(handle, blkno,
6929 new_blkno, num_clusters,
6930 &reflink_cpos, reflink_buckets,
6931 meta_ac, data_ac, args);
6932 if (ret) {
6933 mlog_errno(ret);
6934 goto out;
6935 }
6936
6937 /*
6938 * For the 1st allocated cluster, we make it use the same cpos
6939 * so that the xattr tree looks the same as the original one
6940 * in the most case.
6941 */
6942 if (!first_inserted) {
6943 reflink_cpos = cpos;
6944 first_inserted = 1;
6945 }
6946 ret = ocfs2_insert_extent(handle, et, reflink_cpos, new_blkno,
6947 num_clusters, 0, meta_ac);
6948 if (ret)
6949 mlog_errno(ret);
6950
6951 trace_ocfs2_reflink_xattr_buckets((unsigned long long)new_blkno,
6952 num_clusters, reflink_cpos);
6953
6954 len -= num_clusters;
6955 blkno += ocfs2_clusters_to_blocks(inode->i_sb, num_clusters);
6956 num_buckets -= reflink_buckets;
6957 }
6958 out:
6959 return ret;
6960 }
6961
6962 /*
6963 * Create the same xattr extent record in the new inode's xattr tree.
6964 */
6965 static int ocfs2_reflink_xattr_rec(struct inode *inode,
6966 struct buffer_head *root_bh,
6967 u64 blkno,
6968 u32 cpos,
6969 u32 len,
6970 void *para)
6971 {
6972 int ret, credits = 0;
6973 handle_t *handle;
6974 struct ocfs2_reflink_xattr_tree_args *args =
6975 (struct ocfs2_reflink_xattr_tree_args *)para;
6976 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
6977 struct ocfs2_alloc_context *meta_ac = NULL;
6978 struct ocfs2_alloc_context *data_ac = NULL;
6979 struct ocfs2_extent_tree et;
6980
6981 trace_ocfs2_reflink_xattr_rec((unsigned long long)blkno, len);
6982
6983 ocfs2_init_xattr_tree_extent_tree(&et,
6984 INODE_CACHE(args->reflink->new_inode),
6985 args->new_blk_bh);
6986
6987 ret = ocfs2_lock_reflink_xattr_rec_allocators(args, &et, blkno,
6988 len, &credits,
6989 &meta_ac, &data_ac);
6990 if (ret) {
6991 mlog_errno(ret);
6992 goto out;
6993 }
6994
6995 handle = ocfs2_start_trans(osb, credits);
6996 if (IS_ERR(handle)) {
6997 ret = PTR_ERR(handle);
6998 mlog_errno(ret);
6999 goto out;
7000 }
7001
7002 ret = ocfs2_reflink_xattr_buckets(handle, inode, args, &et,
7003 meta_ac, data_ac,
7004 blkno, cpos, len);
7005 if (ret)
7006 mlog_errno(ret);
7007
7008 ocfs2_commit_trans(osb, handle);
7009
7010 out:
7011 if (meta_ac)
7012 ocfs2_free_alloc_context(meta_ac);
7013 if (data_ac)
7014 ocfs2_free_alloc_context(data_ac);
7015 return ret;
7016 }
7017
7018 /*
7019 * Create reflinked xattr buckets.
7020 * We will add bucket one by one, and refcount all the xattrs in the bucket
7021 * if they are stored outside.
7022 */
7023 static int ocfs2_reflink_xattr_tree(struct ocfs2_xattr_reflink *args,
7024 struct buffer_head *blk_bh,
7025 struct buffer_head *new_blk_bh)
7026 {
7027 int ret;
7028 struct ocfs2_reflink_xattr_tree_args para;
7029
7030 memset(&para, 0, sizeof(para));
7031 para.reflink = args;
7032 para.old_blk_bh = blk_bh;
7033 para.new_blk_bh = new_blk_bh;
7034
7035 para.old_bucket = ocfs2_xattr_bucket_new(args->old_inode);
7036 if (!para.old_bucket) {
7037 mlog_errno(-ENOMEM);
7038 return -ENOMEM;
7039 }
7040
7041 para.new_bucket = ocfs2_xattr_bucket_new(args->new_inode);
7042 if (!para.new_bucket) {
7043 ret = -ENOMEM;
7044 mlog_errno(ret);
7045 goto out;
7046 }
7047
7048 ret = ocfs2_iterate_xattr_index_block(args->old_inode, blk_bh,
7049 ocfs2_reflink_xattr_rec,
7050 &para);
7051 if (ret)
7052 mlog_errno(ret);
7053
7054 out:
7055 ocfs2_xattr_bucket_free(para.old_bucket);
7056 ocfs2_xattr_bucket_free(para.new_bucket);
7057 return ret;
7058 }
7059
7060 static int ocfs2_reflink_xattr_in_block(struct ocfs2_xattr_reflink *args,
7061 struct buffer_head *blk_bh)
7062 {
7063 int ret, indexed = 0;
7064 struct buffer_head *new_blk_bh = NULL;
7065 struct ocfs2_xattr_block *xb =
7066 (struct ocfs2_xattr_block *)blk_bh->b_data;
7067
7068
7069 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)
7070 indexed = 1;
7071
7072 ret = ocfs2_create_empty_xattr_block(args->new_inode, args->new_bh,
7073 &new_blk_bh, indexed);
7074 if (ret) {
7075 mlog_errno(ret);
7076 goto out;
7077 }
7078
7079 if (!indexed)
7080 ret = ocfs2_reflink_xattr_block(args, blk_bh, new_blk_bh);
7081 else
7082 ret = ocfs2_reflink_xattr_tree(args, blk_bh, new_blk_bh);
7083 if (ret)
7084 mlog_errno(ret);
7085
7086 out:
7087 brelse(new_blk_bh);
7088 return ret;
7089 }
7090
7091 static int ocfs2_reflink_xattr_no_security(struct ocfs2_xattr_entry *xe)
7092 {
7093 int type = ocfs2_xattr_get_type(xe);
7094
7095 return type != OCFS2_XATTR_INDEX_SECURITY &&
7096 type != OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS &&
7097 type != OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
7098 }
7099
7100 int ocfs2_reflink_xattrs(struct inode *old_inode,
7101 struct buffer_head *old_bh,
7102 struct inode *new_inode,
7103 struct buffer_head *new_bh,
7104 bool preserve_security)
7105 {
7106 int ret;
7107 struct ocfs2_xattr_reflink args;
7108 struct ocfs2_inode_info *oi = OCFS2_I(old_inode);
7109 struct ocfs2_dinode *di = (struct ocfs2_dinode *)old_bh->b_data;
7110 struct buffer_head *blk_bh = NULL;
7111 struct ocfs2_cached_dealloc_ctxt dealloc;
7112 struct ocfs2_refcount_tree *ref_tree;
7113 struct buffer_head *ref_root_bh = NULL;
7114
7115 ret = ocfs2_lock_refcount_tree(OCFS2_SB(old_inode->i_sb),
7116 le64_to_cpu(di->i_refcount_loc),
7117 1, &ref_tree, &ref_root_bh);
7118 if (ret) {
7119 mlog_errno(ret);
7120 goto out;
7121 }
7122
7123 ocfs2_init_dealloc_ctxt(&dealloc);
7124
7125 args.old_inode = old_inode;
7126 args.new_inode = new_inode;
7127 args.old_bh = old_bh;
7128 args.new_bh = new_bh;
7129 args.ref_ci = &ref_tree->rf_ci;
7130 args.ref_root_bh = ref_root_bh;
7131 args.dealloc = &dealloc;
7132 if (preserve_security)
7133 args.xattr_reflinked = NULL;
7134 else
7135 args.xattr_reflinked = ocfs2_reflink_xattr_no_security;
7136
7137 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
7138 ret = ocfs2_reflink_xattr_inline(&args);
7139 if (ret) {
7140 mlog_errno(ret);
7141 goto out_unlock;
7142 }
7143 }
7144
7145 if (!di->i_xattr_loc)
7146 goto out_unlock;
7147
7148 ret = ocfs2_read_xattr_block(old_inode, le64_to_cpu(di->i_xattr_loc),
7149 &blk_bh);
7150 if (ret < 0) {
7151 mlog_errno(ret);
7152 goto out_unlock;
7153 }
7154
7155 ret = ocfs2_reflink_xattr_in_block(&args, blk_bh);
7156 if (ret)
7157 mlog_errno(ret);
7158
7159 brelse(blk_bh);
7160
7161 out_unlock:
7162 ocfs2_unlock_refcount_tree(OCFS2_SB(old_inode->i_sb),
7163 ref_tree, 1);
7164 brelse(ref_root_bh);
7165
7166 if (ocfs2_dealloc_has_cluster(&dealloc)) {
7167 ocfs2_schedule_truncate_log_flush(OCFS2_SB(old_inode->i_sb), 1);
7168 ocfs2_run_deallocs(OCFS2_SB(old_inode->i_sb), &dealloc);
7169 }
7170
7171 out:
7172 return ret;
7173 }
7174
7175 /*
7176 * Initialize security and acl for a already created inode.
7177 * Used for reflink a non-preserve-security file.
7178 *
7179 * It uses common api like ocfs2_xattr_set, so the caller
7180 * must not hold any lock expect i_mutex.
7181 */
7182 int ocfs2_init_security_and_acl(struct inode *dir,
7183 struct inode *inode,
7184 const struct qstr *qstr)
7185 {
7186 int ret = 0;
7187 struct buffer_head *dir_bh = NULL;
7188 struct ocfs2_security_xattr_info si = {
7189 .enable = 1,
7190 };
7191
7192 ret = ocfs2_init_security_get(inode, dir, qstr, &si);
7193 if (!ret) {
7194 ret = ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_SECURITY,
7195 si.name, si.value, si.value_len,
7196 XATTR_CREATE);
7197 if (ret) {
7198 mlog_errno(ret);
7199 goto leave;
7200 }
7201 } else if (ret != -EOPNOTSUPP) {
7202 mlog_errno(ret);
7203 goto leave;
7204 }
7205
7206 ret = ocfs2_inode_lock(dir, &dir_bh, 0);
7207 if (ret) {
7208 mlog_errno(ret);
7209 goto leave;
7210 }
7211
7212 ret = ocfs2_init_acl(NULL, inode, dir, NULL, dir_bh, NULL, NULL);
7213 if (ret)
7214 mlog_errno(ret);
7215
7216 ocfs2_inode_unlock(dir, 0);
7217 brelse(dir_bh);
7218 leave:
7219 return ret;
7220 }
7221 /*
7222 * 'security' attributes support
7223 */
7224 static size_t ocfs2_xattr_security_list(struct dentry *dentry, char *list,
7225 size_t list_size, const char *name,
7226 size_t name_len, int type)
7227 {
7228 const size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
7229 const size_t total_len = prefix_len + name_len + 1;
7230
7231 if (list && total_len <= list_size) {
7232 memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
7233 memcpy(list + prefix_len, name, name_len);
7234 list[prefix_len + name_len] = '\0';
7235 }
7236 return total_len;
7237 }
7238
7239 static int ocfs2_xattr_security_get(struct dentry *dentry, const char *name,
7240 void *buffer, size_t size, int type)
7241 {
7242 if (strcmp(name, "") == 0)
7243 return -EINVAL;
7244 return ocfs2_xattr_get(dentry->d_inode, OCFS2_XATTR_INDEX_SECURITY,
7245 name, buffer, size);
7246 }
7247
7248 static int ocfs2_xattr_security_set(struct dentry *dentry, const char *name,
7249 const void *value, size_t size, int flags, int type)
7250 {
7251 if (strcmp(name, "") == 0)
7252 return -EINVAL;
7253
7254 return ocfs2_xattr_set(dentry->d_inode, OCFS2_XATTR_INDEX_SECURITY,
7255 name, value, size, flags);
7256 }
7257
7258 int ocfs2_init_security_get(struct inode *inode,
7259 struct inode *dir,
7260 const struct qstr *qstr,
7261 struct ocfs2_security_xattr_info *si)
7262 {
7263 /* check whether ocfs2 support feature xattr */
7264 if (!ocfs2_supports_xattr(OCFS2_SB(dir->i_sb)))
7265 return -EOPNOTSUPP;
7266 return security_inode_init_security(inode, dir, qstr, &si->name,
7267 &si->value, &si->value_len);
7268 }
7269
7270 int ocfs2_init_security_set(handle_t *handle,
7271 struct inode *inode,
7272 struct buffer_head *di_bh,
7273 struct ocfs2_security_xattr_info *si,
7274 struct ocfs2_alloc_context *xattr_ac,
7275 struct ocfs2_alloc_context *data_ac)
7276 {
7277 return ocfs2_xattr_set_handle(handle, inode, di_bh,
7278 OCFS2_XATTR_INDEX_SECURITY,
7279 si->name, si->value, si->value_len, 0,
7280 xattr_ac, data_ac);
7281 }
7282
7283 const struct xattr_handler ocfs2_xattr_security_handler = {
7284 .prefix = XATTR_SECURITY_PREFIX,
7285 .list = ocfs2_xattr_security_list,
7286 .get = ocfs2_xattr_security_get,
7287 .set = ocfs2_xattr_security_set,
7288 };
7289
7290 /*
7291 * 'trusted' attributes support
7292 */
7293 static size_t ocfs2_xattr_trusted_list(struct dentry *dentry, char *list,
7294 size_t list_size, const char *name,
7295 size_t name_len, int type)
7296 {
7297 const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
7298 const size_t total_len = prefix_len + name_len + 1;
7299
7300 if (list && total_len <= list_size) {
7301 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
7302 memcpy(list + prefix_len, name, name_len);
7303 list[prefix_len + name_len] = '\0';
7304 }
7305 return total_len;
7306 }
7307
7308 static int ocfs2_xattr_trusted_get(struct dentry *dentry, const char *name,
7309 void *buffer, size_t size, int type)
7310 {
7311 if (strcmp(name, "") == 0)
7312 return -EINVAL;
7313 return ocfs2_xattr_get(dentry->d_inode, OCFS2_XATTR_INDEX_TRUSTED,
7314 name, buffer, size);
7315 }
7316
7317 static int ocfs2_xattr_trusted_set(struct dentry *dentry, const char *name,
7318 const void *value, size_t size, int flags, int type)
7319 {
7320 if (strcmp(name, "") == 0)
7321 return -EINVAL;
7322
7323 return ocfs2_xattr_set(dentry->d_inode, OCFS2_XATTR_INDEX_TRUSTED,
7324 name, value, size, flags);
7325 }
7326
7327 const struct xattr_handler ocfs2_xattr_trusted_handler = {
7328 .prefix = XATTR_TRUSTED_PREFIX,
7329 .list = ocfs2_xattr_trusted_list,
7330 .get = ocfs2_xattr_trusted_get,
7331 .set = ocfs2_xattr_trusted_set,
7332 };
7333
7334 /*
7335 * 'user' attributes support
7336 */
7337 static size_t ocfs2_xattr_user_list(struct dentry *dentry, char *list,
7338 size_t list_size, const char *name,
7339 size_t name_len, int type)
7340 {
7341 const size_t prefix_len = XATTR_USER_PREFIX_LEN;
7342 const size_t total_len = prefix_len + name_len + 1;
7343 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7344
7345 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7346 return 0;
7347
7348 if (list && total_len <= list_size) {
7349 memcpy(list, XATTR_USER_PREFIX, prefix_len);
7350 memcpy(list + prefix_len, name, name_len);
7351 list[prefix_len + name_len] = '\0';
7352 }
7353 return total_len;
7354 }
7355
7356 static int ocfs2_xattr_user_get(struct dentry *dentry, const char *name,
7357 void *buffer, size_t size, int type)
7358 {
7359 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7360
7361 if (strcmp(name, "") == 0)
7362 return -EINVAL;
7363 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7364 return -EOPNOTSUPP;
7365 return ocfs2_xattr_get(dentry->d_inode, OCFS2_XATTR_INDEX_USER, name,
7366 buffer, size);
7367 }
7368
7369 static int ocfs2_xattr_user_set(struct dentry *dentry, const char *name,
7370 const void *value, size_t size, int flags, int type)
7371 {
7372 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7373
7374 if (strcmp(name, "") == 0)
7375 return -EINVAL;
7376 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7377 return -EOPNOTSUPP;
7378
7379 return ocfs2_xattr_set(dentry->d_inode, OCFS2_XATTR_INDEX_USER,
7380 name, value, size, flags);
7381 }
7382
7383 const struct xattr_handler ocfs2_xattr_user_handler = {
7384 .prefix = XATTR_USER_PREFIX,
7385 .list = ocfs2_xattr_user_list,
7386 .get = ocfs2_xattr_user_get,
7387 .set = ocfs2_xattr_user_set,
7388 };
Linux with added FPC-III support