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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / fs / ocfs2 / xattr.c
blob0ba9ea1e7961f8fa9f357853763f2514aa21a1b9
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 umode_t mode,
627 struct ocfs2_security_xattr_info *si,
628 int *want_clusters,
629 int *xattr_credits,
630 int *want_meta)
631 {
632 int ret = 0;
633 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
634 int s_size = 0, a_size = 0, acl_len = 0, new_clusters;
635
636 if (si->enable)
637 s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
638 si->value_len);
639
640 if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
641 acl_len = ocfs2_xattr_get_nolock(dir, dir_bh,
642 OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT,
643 "", NULL, 0);
644 if (acl_len > 0) {
645 a_size = ocfs2_xattr_entry_real_size(0, acl_len);
646 if (S_ISDIR(mode))
647 a_size <<= 1;
648 } else if (acl_len != 0 && acl_len != -ENODATA) {
649 mlog_errno(ret);
650 return ret;
651 }
652 }
653
654 if (!(s_size + a_size))
655 return ret;
656
657 /*
658 * The max space of security xattr taken inline is
659 * 256(name) + 80(value) + 16(entry) = 352 bytes,
660 * The max space of acl xattr taken inline is
661 * 80(value) + 16(entry) * 2(if directory) = 192 bytes,
662 * when blocksize = 512, may reserve one more cluser for
663 * xattr bucket, otherwise reserve one metadata block
664 * for them is ok.
665 * If this is a new directory with inline data,
666 * we choose to reserve the entire inline area for
667 * directory contents and force an external xattr block.
668 */
669 if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
670 (S_ISDIR(mode) && ocfs2_supports_inline_data(osb)) ||
671 (s_size + a_size) > OCFS2_XATTR_FREE_IN_IBODY) {
672 *want_meta = *want_meta + 1;
673 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
674 }
675
676 if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE &&
677 (s_size + a_size) > OCFS2_XATTR_FREE_IN_BLOCK(dir)) {
678 *want_clusters += 1;
679 *xattr_credits += ocfs2_blocks_per_xattr_bucket(dir->i_sb);
680 }
681
682 /*
683 * reserve credits and clusters for xattrs which has large value
684 * and have to be set outside
685 */
686 if (si->enable && si->value_len > OCFS2_XATTR_INLINE_SIZE) {
687 new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
688 si->value_len);
689 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
690 new_clusters);
691 *want_clusters += new_clusters;
692 }
693 if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL &&
694 acl_len > OCFS2_XATTR_INLINE_SIZE) {
695 /* for directory, it has DEFAULT and ACCESS two types of acls */
696 new_clusters = (S_ISDIR(mode) ? 2 : 1) *
697 ocfs2_clusters_for_bytes(dir->i_sb, acl_len);
698 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
699 new_clusters);
700 *want_clusters += new_clusters;
701 }
702
703 return ret;
704 }
705
706 static int ocfs2_xattr_extend_allocation(struct inode *inode,
707 u32 clusters_to_add,
708 struct ocfs2_xattr_value_buf *vb,
709 struct ocfs2_xattr_set_ctxt *ctxt)
710 {
711 int status = 0, credits;
712 handle_t *handle = ctxt->handle;
713 enum ocfs2_alloc_restarted why;
714 u32 prev_clusters, logical_start = le32_to_cpu(vb->vb_xv->xr_clusters);
715 struct ocfs2_extent_tree et;
716
717 ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
718
719 while (clusters_to_add) {
720 trace_ocfs2_xattr_extend_allocation(clusters_to_add);
721
722 status = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
723 OCFS2_JOURNAL_ACCESS_WRITE);
724 if (status < 0) {
725 mlog_errno(status);
726 break;
727 }
728
729 prev_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
730 status = ocfs2_add_clusters_in_btree(handle,
731 &et,
732 &logical_start,
733 clusters_to_add,
734 0,
735 ctxt->data_ac,
736 ctxt->meta_ac,
737 &why);
738 if ((status < 0) && (status != -EAGAIN)) {
739 if (status != -ENOSPC)
740 mlog_errno(status);
741 break;
742 }
743
744 ocfs2_journal_dirty(handle, vb->vb_bh);
745
746 clusters_to_add -= le32_to_cpu(vb->vb_xv->xr_clusters) -
747 prev_clusters;
748
749 if (why != RESTART_NONE && clusters_to_add) {
750 /*
751 * We can only fail in case the alloc file doesn't give
752 * up enough clusters.
753 */
754 BUG_ON(why == RESTART_META);
755
756 credits = ocfs2_calc_extend_credits(inode->i_sb,
757 &vb->vb_xv->xr_list,
758 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
2380 ocfs2_commit_trans(osb, ctxt.handle);
2381 if (ctxt.meta_ac) {
2382 ocfs2_free_alloc_context(ctxt.meta_ac);
2383 ctxt.meta_ac = NULL;
2384 }
2385
2386 if (ret < 0) {
2387 mlog_errno(ret);
2388 break;
2389 }
2390
2391 }
2392
2393 if (ctxt.meta_ac)
2394 ocfs2_free_alloc_context(ctxt.meta_ac);
2395 ocfs2_schedule_truncate_log_flush(osb, 1);
2396 ocfs2_run_deallocs(osb, &ctxt.dealloc);
2397 return ret;
2398 }
2399
2400 static int ocfs2_xattr_ibody_remove(struct inode *inode,
2401 struct buffer_head *di_bh,
2402 struct ocfs2_caching_info *ref_ci,
2403 struct buffer_head *ref_root_bh)
2404 {
2405
2406 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2407 struct ocfs2_xattr_header *header;
2408 int ret;
2409 struct ocfs2_xattr_value_buf vb = {
2410 .vb_bh = di_bh,
2411 .vb_access = ocfs2_journal_access_di,
2412 };
2413
2414 header = (struct ocfs2_xattr_header *)
2415 ((void *)di + inode->i_sb->s_blocksize -
2416 le16_to_cpu(di->i_xattr_inline_size));
2417
2418 ret = ocfs2_remove_value_outside(inode, &vb, header,
2419 ref_ci, ref_root_bh);
2420
2421 return ret;
2422 }
2423
2424 struct ocfs2_rm_xattr_bucket_para {
2425 struct ocfs2_caching_info *ref_ci;
2426 struct buffer_head *ref_root_bh;
2427 };
2428
2429 static int ocfs2_xattr_block_remove(struct inode *inode,
2430 struct buffer_head *blk_bh,
2431 struct ocfs2_caching_info *ref_ci,
2432 struct buffer_head *ref_root_bh)
2433 {
2434 struct ocfs2_xattr_block *xb;
2435 int ret = 0;
2436 struct ocfs2_xattr_value_buf vb = {
2437 .vb_bh = blk_bh,
2438 .vb_access = ocfs2_journal_access_xb,
2439 };
2440 struct ocfs2_rm_xattr_bucket_para args = {
2441 .ref_ci = ref_ci,
2442 .ref_root_bh = ref_root_bh,
2443 };
2444
2445 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2446 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2447 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
2448 ret = ocfs2_remove_value_outside(inode, &vb, header,
2449 ref_ci, ref_root_bh);
2450 } else
2451 ret = ocfs2_iterate_xattr_index_block(inode,
2452 blk_bh,
2453 ocfs2_rm_xattr_cluster,
2454 &args);
2455
2456 return ret;
2457 }
2458
2459 static int ocfs2_xattr_free_block(struct inode *inode,
2460 u64 block,
2461 struct ocfs2_caching_info *ref_ci,
2462 struct buffer_head *ref_root_bh)
2463 {
2464 struct inode *xb_alloc_inode;
2465 struct buffer_head *xb_alloc_bh = NULL;
2466 struct buffer_head *blk_bh = NULL;
2467 struct ocfs2_xattr_block *xb;
2468 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2469 handle_t *handle;
2470 int ret = 0;
2471 u64 blk, bg_blkno;
2472 u16 bit;
2473
2474 ret = ocfs2_read_xattr_block(inode, block, &blk_bh);
2475 if (ret < 0) {
2476 mlog_errno(ret);
2477 goto out;
2478 }
2479
2480 ret = ocfs2_xattr_block_remove(inode, blk_bh, ref_ci, ref_root_bh);
2481 if (ret < 0) {
2482 mlog_errno(ret);
2483 goto out;
2484 }
2485
2486 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2487 blk = le64_to_cpu(xb->xb_blkno);
2488 bit = le16_to_cpu(xb->xb_suballoc_bit);
2489 if (xb->xb_suballoc_loc)
2490 bg_blkno = le64_to_cpu(xb->xb_suballoc_loc);
2491 else
2492 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
2493
2494 xb_alloc_inode = ocfs2_get_system_file_inode(osb,
2495 EXTENT_ALLOC_SYSTEM_INODE,
2496 le16_to_cpu(xb->xb_suballoc_slot));
2497 if (!xb_alloc_inode) {
2498 ret = -ENOMEM;
2499 mlog_errno(ret);
2500 goto out;
2501 }
2502 mutex_lock(&xb_alloc_inode->i_mutex);
2503
2504 ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
2505 if (ret < 0) {
2506 mlog_errno(ret);
2507 goto out_mutex;
2508 }
2509
2510 handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
2511 if (IS_ERR(handle)) {
2512 ret = PTR_ERR(handle);
2513 mlog_errno(ret);
2514 goto out_unlock;
2515 }
2516
2517 ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
2518 bit, bg_blkno, 1);
2519 if (ret < 0)
2520 mlog_errno(ret);
2521
2522 ocfs2_commit_trans(osb, handle);
2523 out_unlock:
2524 ocfs2_inode_unlock(xb_alloc_inode, 1);
2525 brelse(xb_alloc_bh);
2526 out_mutex:
2527 mutex_unlock(&xb_alloc_inode->i_mutex);
2528 iput(xb_alloc_inode);
2529 out:
2530 brelse(blk_bh);
2531 return ret;
2532 }
2533
2534 /*
2535 * ocfs2_xattr_remove()
2536 *
2537 * Free extended attribute resources associated with this inode.
2538 */
2539 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
2540 {
2541 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2542 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2543 struct ocfs2_refcount_tree *ref_tree = NULL;
2544 struct buffer_head *ref_root_bh = NULL;
2545 struct ocfs2_caching_info *ref_ci = NULL;
2546 handle_t *handle;
2547 int ret;
2548
2549 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2550 return 0;
2551
2552 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
2553 return 0;
2554
2555 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) {
2556 ret = ocfs2_lock_refcount_tree(OCFS2_SB(inode->i_sb),
2557 le64_to_cpu(di->i_refcount_loc),
2558 1, &ref_tree, &ref_root_bh);
2559 if (ret) {
2560 mlog_errno(ret);
2561 goto out;
2562 }
2563 ref_ci = &ref_tree->rf_ci;
2564
2565 }
2566
2567 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2568 ret = ocfs2_xattr_ibody_remove(inode, di_bh,
2569 ref_ci, ref_root_bh);
2570 if (ret < 0) {
2571 mlog_errno(ret);
2572 goto out;
2573 }
2574 }
2575
2576 if (di->i_xattr_loc) {
2577 ret = ocfs2_xattr_free_block(inode,
2578 le64_to_cpu(di->i_xattr_loc),
2579 ref_ci, ref_root_bh);
2580 if (ret < 0) {
2581 mlog_errno(ret);
2582 goto out;
2583 }
2584 }
2585
2586 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
2587 OCFS2_INODE_UPDATE_CREDITS);
2588 if (IS_ERR(handle)) {
2589 ret = PTR_ERR(handle);
2590 mlog_errno(ret);
2591 goto out;
2592 }
2593 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
2594 OCFS2_JOURNAL_ACCESS_WRITE);
2595 if (ret) {
2596 mlog_errno(ret);
2597 goto out_commit;
2598 }
2599
2600 di->i_xattr_loc = 0;
2601
2602 spin_lock(&oi->ip_lock);
2603 oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
2604 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
2605 spin_unlock(&oi->ip_lock);
2606
2607 ocfs2_journal_dirty(handle, di_bh);
2608 out_commit:
2609 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
2610 out:
2611 if (ref_tree)
2612 ocfs2_unlock_refcount_tree(OCFS2_SB(inode->i_sb), ref_tree, 1);
2613 brelse(ref_root_bh);
2614 return ret;
2615 }
2616
2617 static int ocfs2_xattr_has_space_inline(struct inode *inode,
2618 struct ocfs2_dinode *di)
2619 {
2620 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2621 unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
2622 int free;
2623
2624 if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
2625 return 0;
2626
2627 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2628 struct ocfs2_inline_data *idata = &di->id2.i_data;
2629 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
2630 } else if (ocfs2_inode_is_fast_symlink(inode)) {
2631 free = ocfs2_fast_symlink_chars(inode->i_sb) -
2632 le64_to_cpu(di->i_size);
2633 } else {
2634 struct ocfs2_extent_list *el = &di->id2.i_list;
2635 free = (le16_to_cpu(el->l_count) -
2636 le16_to_cpu(el->l_next_free_rec)) *
2637 sizeof(struct ocfs2_extent_rec);
2638 }
2639 if (free >= xattrsize)
2640 return 1;
2641
2642 return 0;
2643 }
2644
2645 /*
2646 * ocfs2_xattr_ibody_find()
2647 *
2648 * Find extended attribute in inode block and
2649 * fill search info into struct ocfs2_xattr_search.
2650 */
2651 static int ocfs2_xattr_ibody_find(struct inode *inode,
2652 int name_index,
2653 const char *name,
2654 struct ocfs2_xattr_search *xs)
2655 {
2656 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2657 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2658 int ret;
2659 int has_space = 0;
2660
2661 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2662 return 0;
2663
2664 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2665 down_read(&oi->ip_alloc_sem);
2666 has_space = ocfs2_xattr_has_space_inline(inode, di);
2667 up_read(&oi->ip_alloc_sem);
2668 if (!has_space)
2669 return 0;
2670 }
2671
2672 xs->xattr_bh = xs->inode_bh;
2673 xs->end = (void *)di + inode->i_sb->s_blocksize;
2674 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
2675 xs->header = (struct ocfs2_xattr_header *)
2676 (xs->end - le16_to_cpu(di->i_xattr_inline_size));
2677 else
2678 xs->header = (struct ocfs2_xattr_header *)
2679 (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
2680 xs->base = (void *)xs->header;
2681 xs->here = xs->header->xh_entries;
2682
2683 /* Find the named attribute. */
2684 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2685 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2686 if (ret && ret != -ENODATA)
2687 return ret;
2688 xs->not_found = ret;
2689 }
2690
2691 return 0;
2692 }
2693
2694 static int ocfs2_xattr_ibody_init(struct inode *inode,
2695 struct buffer_head *di_bh,
2696 struct ocfs2_xattr_set_ctxt *ctxt)
2697 {
2698 int ret;
2699 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2700 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2701 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2702 unsigned int xattrsize = osb->s_xattr_inline_size;
2703
2704 if (!ocfs2_xattr_has_space_inline(inode, di)) {
2705 ret = -ENOSPC;
2706 goto out;
2707 }
2708
2709 ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode), di_bh,
2710 OCFS2_JOURNAL_ACCESS_WRITE);
2711 if (ret) {
2712 mlog_errno(ret);
2713 goto out;
2714 }
2715
2716 /*
2717 * Adjust extent record count or inline data size
2718 * to reserve space for extended attribute.
2719 */
2720 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2721 struct ocfs2_inline_data *idata = &di->id2.i_data;
2722 le16_add_cpu(&idata->id_count, -xattrsize);
2723 } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
2724 struct ocfs2_extent_list *el = &di->id2.i_list;
2725 le16_add_cpu(&el->l_count, -(xattrsize /
2726 sizeof(struct ocfs2_extent_rec)));
2727 }
2728 di->i_xattr_inline_size = cpu_to_le16(xattrsize);
2729
2730 spin_lock(&oi->ip_lock);
2731 oi->ip_dyn_features |= OCFS2_INLINE_XATTR_FL|OCFS2_HAS_XATTR_FL;
2732 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
2733 spin_unlock(&oi->ip_lock);
2734
2735 ocfs2_journal_dirty(ctxt->handle, di_bh);
2736
2737 out:
2738 return ret;
2739 }
2740
2741 /*
2742 * ocfs2_xattr_ibody_set()
2743 *
2744 * Set, replace or remove an extended attribute into inode block.
2745 *
2746 */
2747 static int ocfs2_xattr_ibody_set(struct inode *inode,
2748 struct ocfs2_xattr_info *xi,
2749 struct ocfs2_xattr_search *xs,
2750 struct ocfs2_xattr_set_ctxt *ctxt)
2751 {
2752 int ret;
2753 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2754 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2755 struct ocfs2_xa_loc loc;
2756
2757 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2758 return -ENOSPC;
2759
2760 down_write(&oi->ip_alloc_sem);
2761 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2762 if (!ocfs2_xattr_has_space_inline(inode, di)) {
2763 ret = -ENOSPC;
2764 goto out;
2765 }
2766 }
2767
2768 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2769 ret = ocfs2_xattr_ibody_init(inode, xs->inode_bh, ctxt);
2770 if (ret) {
2771 if (ret != -ENOSPC)
2772 mlog_errno(ret);
2773 goto out;
2774 }
2775 }
2776
2777 ocfs2_init_dinode_xa_loc(&loc, inode, xs->inode_bh,
2778 xs->not_found ? NULL : xs->here);
2779 ret = ocfs2_xa_set(&loc, xi, ctxt);
2780 if (ret) {
2781 if (ret != -ENOSPC)
2782 mlog_errno(ret);
2783 goto out;
2784 }
2785 xs->here = loc.xl_entry;
2786
2787 out:
2788 up_write(&oi->ip_alloc_sem);
2789
2790 return ret;
2791 }
2792
2793 /*
2794 * ocfs2_xattr_block_find()
2795 *
2796 * Find extended attribute in external block and
2797 * fill search info into struct ocfs2_xattr_search.
2798 */
2799 static int ocfs2_xattr_block_find(struct inode *inode,
2800 int name_index,
2801 const char *name,
2802 struct ocfs2_xattr_search *xs)
2803 {
2804 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2805 struct buffer_head *blk_bh = NULL;
2806 struct ocfs2_xattr_block *xb;
2807 int ret = 0;
2808
2809 if (!di->i_xattr_loc)
2810 return ret;
2811
2812 ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
2813 &blk_bh);
2814 if (ret < 0) {
2815 mlog_errno(ret);
2816 return ret;
2817 }
2818
2819 xs->xattr_bh = blk_bh;
2820 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2821
2822 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2823 xs->header = &xb->xb_attrs.xb_header;
2824 xs->base = (void *)xs->header;
2825 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
2826 xs->here = xs->header->xh_entries;
2827
2828 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2829 } else
2830 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
2831 name_index,
2832 name, xs);
2833
2834 if (ret && ret != -ENODATA) {
2835 xs->xattr_bh = NULL;
2836 goto cleanup;
2837 }
2838 xs->not_found = ret;
2839 return 0;
2840 cleanup:
2841 brelse(blk_bh);
2842
2843 return ret;
2844 }
2845
2846 static int ocfs2_create_xattr_block(struct inode *inode,
2847 struct buffer_head *inode_bh,
2848 struct ocfs2_xattr_set_ctxt *ctxt,
2849 int indexed,
2850 struct buffer_head **ret_bh)
2851 {
2852 int ret;
2853 u16 suballoc_bit_start;
2854 u32 num_got;
2855 u64 suballoc_loc, first_blkno;
2856 struct ocfs2_dinode *di = (struct ocfs2_dinode *)inode_bh->b_data;
2857 struct buffer_head *new_bh = NULL;
2858 struct ocfs2_xattr_block *xblk;
2859
2860 ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
2861 inode_bh, OCFS2_JOURNAL_ACCESS_CREATE);
2862 if (ret < 0) {
2863 mlog_errno(ret);
2864 goto end;
2865 }
2866
2867 ret = ocfs2_claim_metadata(ctxt->handle, ctxt->meta_ac, 1,
2868 &suballoc_loc, &suballoc_bit_start,
2869 &num_got, &first_blkno);
2870 if (ret < 0) {
2871 mlog_errno(ret);
2872 goto end;
2873 }
2874
2875 new_bh = sb_getblk(inode->i_sb, first_blkno);
2876 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), new_bh);
2877
2878 ret = ocfs2_journal_access_xb(ctxt->handle, INODE_CACHE(inode),
2879 new_bh,
2880 OCFS2_JOURNAL_ACCESS_CREATE);
2881 if (ret < 0) {
2882 mlog_errno(ret);
2883 goto end;
2884 }
2885
2886 /* Initialize ocfs2_xattr_block */
2887 xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
2888 memset(xblk, 0, inode->i_sb->s_blocksize);
2889 strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
2890 xblk->xb_suballoc_slot = cpu_to_le16(ctxt->meta_ac->ac_alloc_slot);
2891 xblk->xb_suballoc_loc = cpu_to_le64(suballoc_loc);
2892 xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
2893 xblk->xb_fs_generation =
2894 cpu_to_le32(OCFS2_SB(inode->i_sb)->fs_generation);
2895 xblk->xb_blkno = cpu_to_le64(first_blkno);
2896 if (indexed) {
2897 struct ocfs2_xattr_tree_root *xr = &xblk->xb_attrs.xb_root;
2898 xr->xt_clusters = cpu_to_le32(1);
2899 xr->xt_last_eb_blk = 0;
2900 xr->xt_list.l_tree_depth = 0;
2901 xr->xt_list.l_count = cpu_to_le16(
2902 ocfs2_xattr_recs_per_xb(inode->i_sb));
2903 xr->xt_list.l_next_free_rec = cpu_to_le16(1);
2904 xblk->xb_flags = cpu_to_le16(OCFS2_XATTR_INDEXED);
2905 }
2906 ocfs2_journal_dirty(ctxt->handle, new_bh);
2907
2908 /* Add it to the inode */
2909 di->i_xattr_loc = cpu_to_le64(first_blkno);
2910
2911 spin_lock(&OCFS2_I(inode)->ip_lock);
2912 OCFS2_I(inode)->ip_dyn_features |= OCFS2_HAS_XATTR_FL;
2913 di->i_dyn_features = cpu_to_le16(OCFS2_I(inode)->ip_dyn_features);
2914 spin_unlock(&OCFS2_I(inode)->ip_lock);
2915
2916 ocfs2_journal_dirty(ctxt->handle, inode_bh);
2917
2918 *ret_bh = new_bh;
2919 new_bh = NULL;
2920
2921 end:
2922 brelse(new_bh);
2923 return ret;
2924 }
2925
2926 /*
2927 * ocfs2_xattr_block_set()
2928 *
2929 * Set, replace or remove an extended attribute into external block.
2930 *
2931 */
2932 static int ocfs2_xattr_block_set(struct inode *inode,
2933 struct ocfs2_xattr_info *xi,
2934 struct ocfs2_xattr_search *xs,
2935 struct ocfs2_xattr_set_ctxt *ctxt)
2936 {
2937 struct buffer_head *new_bh = NULL;
2938 struct ocfs2_xattr_block *xblk = NULL;
2939 int ret;
2940 struct ocfs2_xa_loc loc;
2941
2942 if (!xs->xattr_bh) {
2943 ret = ocfs2_create_xattr_block(inode, xs->inode_bh, ctxt,
2944 0, &new_bh);
2945 if (ret) {
2946 mlog_errno(ret);
2947 goto end;
2948 }
2949
2950 xs->xattr_bh = new_bh;
2951 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2952 xs->header = &xblk->xb_attrs.xb_header;
2953 xs->base = (void *)xs->header;
2954 xs->end = (void *)xblk + inode->i_sb->s_blocksize;
2955 xs->here = xs->header->xh_entries;
2956 } else
2957 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2958
2959 if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
2960 ocfs2_init_xattr_block_xa_loc(&loc, inode, xs->xattr_bh,
2961 xs->not_found ? NULL : xs->here);
2962
2963 ret = ocfs2_xa_set(&loc, xi, ctxt);
2964 if (!ret)
2965 xs->here = loc.xl_entry;
2966 else if ((ret != -ENOSPC) || ctxt->set_abort)
2967 goto end;
2968 else {
2969 ret = ocfs2_xattr_create_index_block(inode, xs, ctxt);
2970 if (ret)
2971 goto end;
2972 }
2973 }
2974
2975 if (le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)
2976 ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs, ctxt);
2977
2978 end:
2979 return ret;
2980 }
2981
2982 /* Check whether the new xattr can be inserted into the inode. */
2983 static int ocfs2_xattr_can_be_in_inode(struct inode *inode,
2984 struct ocfs2_xattr_info *xi,
2985 struct ocfs2_xattr_search *xs)
2986 {
2987 struct ocfs2_xattr_entry *last;
2988 int free, i;
2989 size_t min_offs = xs->end - xs->base;
2990
2991 if (!xs->header)
2992 return 0;
2993
2994 last = xs->header->xh_entries;
2995
2996 for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
2997 size_t offs = le16_to_cpu(last->xe_name_offset);
2998 if (offs < min_offs)
2999 min_offs = offs;
3000 last += 1;
3001 }
3002
3003 free = min_offs - ((void *)last - xs->base) - OCFS2_XATTR_HEADER_GAP;
3004 if (free < 0)
3005 return 0;
3006
3007 BUG_ON(!xs->not_found);
3008
3009 if (free >= (sizeof(struct ocfs2_xattr_entry) + namevalue_size_xi(xi)))
3010 return 1;
3011
3012 return 0;
3013 }
3014
3015 static int ocfs2_calc_xattr_set_need(struct inode *inode,
3016 struct ocfs2_dinode *di,
3017 struct ocfs2_xattr_info *xi,
3018 struct ocfs2_xattr_search *xis,
3019 struct ocfs2_xattr_search *xbs,
3020 int *clusters_need,
3021 int *meta_need,
3022 int *credits_need)
3023 {
3024 int ret = 0, old_in_xb = 0;
3025 int clusters_add = 0, meta_add = 0, credits = 0;
3026 struct buffer_head *bh = NULL;
3027 struct ocfs2_xattr_block *xb = NULL;
3028 struct ocfs2_xattr_entry *xe = NULL;
3029 struct ocfs2_xattr_value_root *xv = NULL;
3030 char *base = NULL;
3031 int name_offset, name_len = 0;
3032 u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
3033 xi->xi_value_len);
3034 u64 value_size;
3035
3036 /*
3037 * Calculate the clusters we need to write.
3038 * No matter whether we replace an old one or add a new one,
3039 * we need this for writing.
3040 */
3041 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE)
3042 credits += new_clusters *
3043 ocfs2_clusters_to_blocks(inode->i_sb, 1);
3044
3045 if (xis->not_found && xbs->not_found) {
3046 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3047
3048 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3049 clusters_add += new_clusters;
3050 credits += ocfs2_calc_extend_credits(inode->i_sb,
3051 &def_xv.xv.xr_list,
3052 new_clusters);
3053 }
3054
3055 goto meta_guess;
3056 }
3057
3058 if (!xis->not_found) {
3059 xe = xis->here;
3060 name_offset = le16_to_cpu(xe->xe_name_offset);
3061 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3062 base = xis->base;
3063 credits += OCFS2_INODE_UPDATE_CREDITS;
3064 } else {
3065 int i, block_off = 0;
3066 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
3067 xe = xbs->here;
3068 name_offset = le16_to_cpu(xe->xe_name_offset);
3069 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3070 i = xbs->here - xbs->header->xh_entries;
3071 old_in_xb = 1;
3072
3073 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
3074 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3075 bucket_xh(xbs->bucket),
3076 i, &block_off,
3077 &name_offset);
3078 base = bucket_block(xbs->bucket, block_off);
3079 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3080 } else {
3081 base = xbs->base;
3082 credits += OCFS2_XATTR_BLOCK_UPDATE_CREDITS;
3083 }
3084 }
3085
3086 /*
3087 * delete a xattr doesn't need metadata and cluster allocation.
3088 * so just calculate the credits and return.
3089 *
3090 * The credits for removing the value tree will be extended
3091 * by ocfs2_remove_extent itself.
3092 */
3093 if (!xi->xi_value) {
3094 if (!ocfs2_xattr_is_local(xe))
3095 credits += ocfs2_remove_extent_credits(inode->i_sb);
3096
3097 goto out;
3098 }
3099
3100 /* do cluster allocation guess first. */
3101 value_size = le64_to_cpu(xe->xe_value_size);
3102
3103 if (old_in_xb) {
3104 /*
3105 * In xattr set, we always try to set the xe in inode first,
3106 * so if it can be inserted into inode successfully, the old
3107 * one will be removed from the xattr block, and this xattr
3108 * will be inserted into inode as a new xattr in inode.
3109 */
3110 if (ocfs2_xattr_can_be_in_inode(inode, xi, xis)) {
3111 clusters_add += new_clusters;
3112 credits += ocfs2_remove_extent_credits(inode->i_sb) +
3113 OCFS2_INODE_UPDATE_CREDITS;
3114 if (!ocfs2_xattr_is_local(xe))
3115 credits += ocfs2_calc_extend_credits(
3116 inode->i_sb,
3117 &def_xv.xv.xr_list,
3118 new_clusters);
3119 goto out;
3120 }
3121 }
3122
3123 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3124 /* the new values will be stored outside. */
3125 u32 old_clusters = 0;
3126
3127 if (!ocfs2_xattr_is_local(xe)) {
3128 old_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
3129 value_size);
3130 xv = (struct ocfs2_xattr_value_root *)
3131 (base + name_offset + name_len);
3132 value_size = OCFS2_XATTR_ROOT_SIZE;
3133 } else
3134 xv = &def_xv.xv;
3135
3136 if (old_clusters >= new_clusters) {
3137 credits += ocfs2_remove_extent_credits(inode->i_sb);
3138 goto out;
3139 } else {
3140 meta_add += ocfs2_extend_meta_needed(&xv->xr_list);
3141 clusters_add += new_clusters - old_clusters;
3142 credits += ocfs2_calc_extend_credits(inode->i_sb,
3143 &xv->xr_list,
3144 new_clusters -
3145 old_clusters);
3146 if (value_size >= OCFS2_XATTR_ROOT_SIZE)
3147 goto out;
3148 }
3149 } else {
3150 /*
3151 * Now the new value will be stored inside. So if the new
3152 * value is smaller than the size of value root or the old
3153 * value, we don't need any allocation, otherwise we have
3154 * to guess metadata allocation.
3155 */
3156 if ((ocfs2_xattr_is_local(xe) &&
3157 (value_size >= xi->xi_value_len)) ||
3158 (!ocfs2_xattr_is_local(xe) &&
3159 OCFS2_XATTR_ROOT_SIZE >= xi->xi_value_len))
3160 goto out;
3161 }
3162
3163 meta_guess:
3164 /* calculate metadata allocation. */
3165 if (di->i_xattr_loc) {
3166 if (!xbs->xattr_bh) {
3167 ret = ocfs2_read_xattr_block(inode,
3168 le64_to_cpu(di->i_xattr_loc),
3169 &bh);
3170 if (ret) {
3171 mlog_errno(ret);
3172 goto out;
3173 }
3174
3175 xb = (struct ocfs2_xattr_block *)bh->b_data;
3176 } else
3177 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
3178
3179 /*
3180 * If there is already an xattr tree, good, we can calculate
3181 * like other b-trees. Otherwise we may have the chance of
3182 * create a tree, the credit calculation is borrowed from
3183 * ocfs2_calc_extend_credits with root_el = NULL. And the
3184 * new tree will be cluster based, so no meta is needed.
3185 */
3186 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
3187 struct ocfs2_extent_list *el =
3188 &xb->xb_attrs.xb_root.xt_list;
3189 meta_add += ocfs2_extend_meta_needed(el);
3190 credits += ocfs2_calc_extend_credits(inode->i_sb,
3191 el, 1);
3192 } else
3193 credits += OCFS2_SUBALLOC_ALLOC + 1;
3194
3195 /*
3196 * This cluster will be used either for new bucket or for
3197 * new xattr block.
3198 * If the cluster size is the same as the bucket size, one
3199 * more is needed since we may need to extend the bucket
3200 * also.
3201 */
3202 clusters_add += 1;
3203 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3204 if (OCFS2_XATTR_BUCKET_SIZE ==
3205 OCFS2_SB(inode->i_sb)->s_clustersize) {
3206 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3207 clusters_add += 1;
3208 }
3209 } else {
3210 meta_add += 1;
3211 credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
3212 }
3213 out:
3214 if (clusters_need)
3215 *clusters_need = clusters_add;
3216 if (meta_need)
3217 *meta_need = meta_add;
3218 if (credits_need)
3219 *credits_need = credits;
3220 brelse(bh);
3221 return ret;
3222 }
3223
3224 static int ocfs2_init_xattr_set_ctxt(struct inode *inode,
3225 struct ocfs2_dinode *di,
3226 struct ocfs2_xattr_info *xi,
3227 struct ocfs2_xattr_search *xis,
3228 struct ocfs2_xattr_search *xbs,
3229 struct ocfs2_xattr_set_ctxt *ctxt,
3230 int extra_meta,
3231 int *credits)
3232 {
3233 int clusters_add, meta_add, ret;
3234 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3235
3236 memset(ctxt, 0, sizeof(struct ocfs2_xattr_set_ctxt));
3237
3238 ocfs2_init_dealloc_ctxt(&ctxt->dealloc);
3239
3240 ret = ocfs2_calc_xattr_set_need(inode, di, xi, xis, xbs,
3241 &clusters_add, &meta_add, credits);
3242 if (ret) {
3243 mlog_errno(ret);
3244 return ret;
3245 }
3246
3247 meta_add += extra_meta;
3248 trace_ocfs2_init_xattr_set_ctxt(xi->xi_name, meta_add,
3249 clusters_add, *credits);
3250
3251 if (meta_add) {
3252 ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add,
3253 &ctxt->meta_ac);
3254 if (ret) {
3255 mlog_errno(ret);
3256 goto out;
3257 }
3258 }
3259
3260 if (clusters_add) {
3261 ret = ocfs2_reserve_clusters(osb, clusters_add, &ctxt->data_ac);
3262 if (ret)
3263 mlog_errno(ret);
3264 }
3265 out:
3266 if (ret) {
3267 if (ctxt->meta_ac) {
3268 ocfs2_free_alloc_context(ctxt->meta_ac);
3269 ctxt->meta_ac = NULL;
3270 }
3271
3272 /*
3273 * We cannot have an error and a non null ctxt->data_ac.
3274 */
3275 }
3276
3277 return ret;
3278 }
3279
3280 static int __ocfs2_xattr_set_handle(struct inode *inode,
3281 struct ocfs2_dinode *di,
3282 struct ocfs2_xattr_info *xi,
3283 struct ocfs2_xattr_search *xis,
3284 struct ocfs2_xattr_search *xbs,
3285 struct ocfs2_xattr_set_ctxt *ctxt)
3286 {
3287 int ret = 0, credits, old_found;
3288
3289 if (!xi->xi_value) {
3290 /* Remove existing extended attribute */
3291 if (!xis->not_found)
3292 ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
3293 else if (!xbs->not_found)
3294 ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3295 } else {
3296 /* We always try to set extended attribute into inode first*/
3297 ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
3298 if (!ret && !xbs->not_found) {
3299 /*
3300 * If succeed and that extended attribute existing in
3301 * external block, then we will remove it.
3302 */
3303 xi->xi_value = NULL;
3304 xi->xi_value_len = 0;
3305
3306 old_found = xis->not_found;
3307 xis->not_found = -ENODATA;
3308 ret = ocfs2_calc_xattr_set_need(inode,
3309 di,
3310 xi,
3311 xis,
3312 xbs,
3313 NULL,
3314 NULL,
3315 &credits);
3316 xis->not_found = old_found;
3317 if (ret) {
3318 mlog_errno(ret);
3319 goto out;
3320 }
3321
3322 ret = ocfs2_extend_trans(ctxt->handle, credits);
3323 if (ret) {
3324 mlog_errno(ret);
3325 goto out;
3326 }
3327 ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3328 } else if ((ret == -ENOSPC) && !ctxt->set_abort) {
3329 if (di->i_xattr_loc && !xbs->xattr_bh) {
3330 ret = ocfs2_xattr_block_find(inode,
3331 xi->xi_name_index,
3332 xi->xi_name, xbs);
3333 if (ret)
3334 goto out;
3335
3336 old_found = xis->not_found;
3337 xis->not_found = -ENODATA;
3338 ret = ocfs2_calc_xattr_set_need(inode,
3339 di,
3340 xi,
3341 xis,
3342 xbs,
3343 NULL,
3344 NULL,
3345 &credits);
3346 xis->not_found = old_found;
3347 if (ret) {
3348 mlog_errno(ret);
3349 goto out;
3350 }
3351
3352 ret = ocfs2_extend_trans(ctxt->handle, credits);
3353 if (ret) {
3354 mlog_errno(ret);
3355 goto out;
3356 }
3357 }
3358 /*
3359 * If no space in inode, we will set extended attribute
3360 * into external block.
3361 */
3362 ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3363 if (ret)
3364 goto out;
3365 if (!xis->not_found) {
3366 /*
3367 * If succeed and that extended attribute
3368 * existing in inode, we will remove it.
3369 */
3370 xi->xi_value = NULL;
3371 xi->xi_value_len = 0;
3372 xbs->not_found = -ENODATA;
3373 ret = ocfs2_calc_xattr_set_need(inode,
3374 di,
3375 xi,
3376 xis,
3377 xbs,
3378 NULL,
3379 NULL,
3380 &credits);
3381 if (ret) {
3382 mlog_errno(ret);
3383 goto out;
3384 }
3385
3386 ret = ocfs2_extend_trans(ctxt->handle, credits);
3387 if (ret) {
3388 mlog_errno(ret);
3389 goto out;
3390 }
3391 ret = ocfs2_xattr_ibody_set(inode, xi,
3392 xis, ctxt);
3393 }
3394 }
3395 }
3396
3397 if (!ret) {
3398 /* Update inode ctime. */
3399 ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
3400 xis->inode_bh,
3401 OCFS2_JOURNAL_ACCESS_WRITE);
3402 if (ret) {
3403 mlog_errno(ret);
3404 goto out;
3405 }
3406
3407 inode->i_ctime = CURRENT_TIME;
3408 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
3409 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
3410 ocfs2_journal_dirty(ctxt->handle, xis->inode_bh);
3411 }
3412 out:
3413 return ret;
3414 }
3415
3416 /*
3417 * This function only called duing creating inode
3418 * for init security/acl xattrs of the new inode.
3419 * All transanction credits have been reserved in mknod.
3420 */
3421 int ocfs2_xattr_set_handle(handle_t *handle,
3422 struct inode *inode,
3423 struct buffer_head *di_bh,
3424 int name_index,
3425 const char *name,
3426 const void *value,
3427 size_t value_len,
3428 int flags,
3429 struct ocfs2_alloc_context *meta_ac,
3430 struct ocfs2_alloc_context *data_ac)
3431 {
3432 struct ocfs2_dinode *di;
3433 int ret;
3434
3435 struct ocfs2_xattr_info xi = {
3436 .xi_name_index = name_index,
3437 .xi_name = name,
3438 .xi_name_len = strlen(name),
3439 .xi_value = value,
3440 .xi_value_len = value_len,
3441 };
3442
3443 struct ocfs2_xattr_search xis = {
3444 .not_found = -ENODATA,
3445 };
3446
3447 struct ocfs2_xattr_search xbs = {
3448 .not_found = -ENODATA,
3449 };
3450
3451 struct ocfs2_xattr_set_ctxt ctxt = {
3452 .handle = handle,
3453 .meta_ac = meta_ac,
3454 .data_ac = data_ac,
3455 };
3456
3457 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
3458 return -EOPNOTSUPP;
3459
3460 /*
3461 * In extreme situation, may need xattr bucket when
3462 * block size is too small. And we have already reserved
3463 * the credits for bucket in mknod.
3464 */
3465 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) {
3466 xbs.bucket = ocfs2_xattr_bucket_new(inode);
3467 if (!xbs.bucket) {
3468 mlog_errno(-ENOMEM);
3469 return -ENOMEM;
3470 }
3471 }
3472
3473 xis.inode_bh = xbs.inode_bh = di_bh;
3474 di = (struct ocfs2_dinode *)di_bh->b_data;
3475
3476 down_write(&OCFS2_I(inode)->ip_xattr_sem);
3477
3478 ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
3479 if (ret)
3480 goto cleanup;
3481 if (xis.not_found) {
3482 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
3483 if (ret)
3484 goto cleanup;
3485 }
3486
3487 ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
3488
3489 cleanup:
3490 up_write(&OCFS2_I(inode)->ip_xattr_sem);
3491 brelse(xbs.xattr_bh);
3492 ocfs2_xattr_bucket_free(xbs.bucket);
3493
3494 return ret;
3495 }
3496
3497 /*
3498 * ocfs2_xattr_set()
3499 *
3500 * Set, replace or remove an extended attribute for this inode.
3501 * value is NULL to remove an existing extended attribute, else either
3502 * create or replace an extended attribute.
3503 */
3504 int ocfs2_xattr_set(struct inode *inode,
3505 int name_index,
3506 const char *name,
3507 const void *value,
3508 size_t value_len,
3509 int flags)
3510 {
3511 struct buffer_head *di_bh = NULL;
3512 struct ocfs2_dinode *di;
3513 int ret, credits, ref_meta = 0, ref_credits = 0;
3514 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3515 struct inode *tl_inode = osb->osb_tl_inode;
3516 struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
3517 struct ocfs2_refcount_tree *ref_tree = NULL;
3518
3519 struct ocfs2_xattr_info xi = {
3520 .xi_name_index = name_index,
3521 .xi_name = name,
3522 .xi_name_len = strlen(name),
3523 .xi_value = value,
3524 .xi_value_len = value_len,
3525 };
3526
3527 struct ocfs2_xattr_search xis = {
3528 .not_found = -ENODATA,
3529 };
3530
3531 struct ocfs2_xattr_search xbs = {
3532 .not_found = -ENODATA,
3533 };
3534
3535 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
3536 return -EOPNOTSUPP;
3537
3538 /*
3539 * Only xbs will be used on indexed trees. xis doesn't need a
3540 * bucket.
3541 */
3542 xbs.bucket = ocfs2_xattr_bucket_new(inode);
3543 if (!xbs.bucket) {
3544 mlog_errno(-ENOMEM);
3545 return -ENOMEM;
3546 }
3547
3548 ret = ocfs2_inode_lock(inode, &di_bh, 1);
3549 if (ret < 0) {
3550 mlog_errno(ret);
3551 goto cleanup_nolock;
3552 }
3553 xis.inode_bh = xbs.inode_bh = di_bh;
3554 di = (struct ocfs2_dinode *)di_bh->b_data;
3555
3556 down_write(&OCFS2_I(inode)->ip_xattr_sem);
3557 /*
3558 * Scan inode and external block to find the same name
3559 * extended attribute and collect search information.
3560 */
3561 ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
3562 if (ret)
3563 goto cleanup;
3564 if (xis.not_found) {
3565 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
3566 if (ret)
3567 goto cleanup;
3568 }
3569
3570 if (xis.not_found && xbs.not_found) {
3571 ret = -ENODATA;
3572 if (flags & XATTR_REPLACE)
3573 goto cleanup;
3574 ret = 0;
3575 if (!value)
3576 goto cleanup;
3577 } else {
3578 ret = -EEXIST;
3579 if (flags & XATTR_CREATE)
3580 goto cleanup;
3581 }
3582
3583 /* Check whether the value is refcounted and do some preparation. */
3584 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL &&
3585 (!xis.not_found || !xbs.not_found)) {
3586 ret = ocfs2_prepare_refcount_xattr(inode, di, &xi,
3587 &xis, &xbs, &ref_tree,
3588 &ref_meta, &ref_credits);
3589 if (ret) {
3590 mlog_errno(ret);
3591 goto cleanup;
3592 }
3593 }
3594
3595 mutex_lock(&tl_inode->i_mutex);
3596
3597 if (ocfs2_truncate_log_needs_flush(osb)) {
3598 ret = __ocfs2_flush_truncate_log(osb);
3599 if (ret < 0) {
3600 mutex_unlock(&tl_inode->i_mutex);
3601 mlog_errno(ret);
3602 goto cleanup;
3603 }
3604 }
3605 mutex_unlock(&tl_inode->i_mutex);
3606
3607 ret = ocfs2_init_xattr_set_ctxt(inode, di, &xi, &xis,
3608 &xbs, &ctxt, ref_meta, &credits);
3609 if (ret) {
3610 mlog_errno(ret);
3611 goto cleanup;
3612 }
3613
3614 /* we need to update inode's ctime field, so add credit for it. */
3615 credits += OCFS2_INODE_UPDATE_CREDITS;
3616 ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
3617 if (IS_ERR(ctxt.handle)) {
3618 ret = PTR_ERR(ctxt.handle);
3619 mlog_errno(ret);
3620 goto cleanup;
3621 }
3622
3623 ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
3624
3625 ocfs2_commit_trans(osb, ctxt.handle);
3626
3627 if (ctxt.data_ac)
3628 ocfs2_free_alloc_context(ctxt.data_ac);
3629 if (ctxt.meta_ac)
3630 ocfs2_free_alloc_context(ctxt.meta_ac);
3631 if (ocfs2_dealloc_has_cluster(&ctxt.dealloc))
3632 ocfs2_schedule_truncate_log_flush(osb, 1);
3633 ocfs2_run_deallocs(osb, &ctxt.dealloc);
3634
3635 cleanup:
3636 if (ref_tree)
3637 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3638 up_write(&OCFS2_I(inode)->ip_xattr_sem);
3639 if (!value && !ret) {
3640 ret = ocfs2_try_remove_refcount_tree(inode, di_bh);
3641 if (ret)
3642 mlog_errno(ret);
3643 }
3644 ocfs2_inode_unlock(inode, 1);
3645 cleanup_nolock:
3646 brelse(di_bh);
3647 brelse(xbs.xattr_bh);
3648 ocfs2_xattr_bucket_free(xbs.bucket);
3649
3650 return ret;
3651 }
3652
3653 /*
3654 * Find the xattr extent rec which may contains name_hash.
3655 * e_cpos will be the first name hash of the xattr rec.
3656 * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
3657 */
3658 static int ocfs2_xattr_get_rec(struct inode *inode,
3659 u32 name_hash,
3660 u64 *p_blkno,
3661 u32 *e_cpos,
3662 u32 *num_clusters,
3663 struct ocfs2_extent_list *el)
3664 {
3665 int ret = 0, i;
3666 struct buffer_head *eb_bh = NULL;
3667 struct ocfs2_extent_block *eb;
3668 struct ocfs2_extent_rec *rec = NULL;
3669 u64 e_blkno = 0;
3670
3671 if (el->l_tree_depth) {
3672 ret = ocfs2_find_leaf(INODE_CACHE(inode), el, name_hash,
3673 &eb_bh);
3674 if (ret) {
3675 mlog_errno(ret);
3676 goto out;
3677 }
3678
3679 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
3680 el = &eb->h_list;
3681
3682 if (el->l_tree_depth) {
3683 ocfs2_error(inode->i_sb,
3684 "Inode %lu has non zero tree depth in "
3685 "xattr tree block %llu\n", inode->i_ino,
3686 (unsigned long long)eb_bh->b_blocknr);
3687 ret = -EROFS;
3688 goto out;
3689 }
3690 }
3691
3692 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
3693 rec = &el->l_recs[i];
3694
3695 if (le32_to_cpu(rec->e_cpos) <= name_hash) {
3696 e_blkno = le64_to_cpu(rec->e_blkno);
3697 break;
3698 }
3699 }
3700
3701 if (!e_blkno) {
3702 ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
3703 "record (%u, %u, 0) in xattr", inode->i_ino,
3704 le32_to_cpu(rec->e_cpos),
3705 ocfs2_rec_clusters(el, rec));
3706 ret = -EROFS;
3707 goto out;
3708 }
3709
3710 *p_blkno = le64_to_cpu(rec->e_blkno);
3711 *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
3712 if (e_cpos)
3713 *e_cpos = le32_to_cpu(rec->e_cpos);
3714 out:
3715 brelse(eb_bh);
3716 return ret;
3717 }
3718
3719 typedef int (xattr_bucket_func)(struct inode *inode,
3720 struct ocfs2_xattr_bucket *bucket,
3721 void *para);
3722
3723 static int ocfs2_find_xe_in_bucket(struct inode *inode,
3724 struct ocfs2_xattr_bucket *bucket,
3725 int name_index,
3726 const char *name,
3727 u32 name_hash,
3728 u16 *xe_index,
3729 int *found)
3730 {
3731 int i, ret = 0, cmp = 1, block_off, new_offset;
3732 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
3733 size_t name_len = strlen(name);
3734 struct ocfs2_xattr_entry *xe = NULL;
3735 char *xe_name;
3736
3737 /*
3738 * We don't use binary search in the bucket because there
3739 * may be multiple entries with the same name hash.
3740 */
3741 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3742 xe = &xh->xh_entries[i];
3743
3744 if (name_hash > le32_to_cpu(xe->xe_name_hash))
3745 continue;
3746 else if (name_hash < le32_to_cpu(xe->xe_name_hash))
3747 break;
3748
3749 cmp = name_index - ocfs2_xattr_get_type(xe);
3750 if (!cmp)
3751 cmp = name_len - xe->xe_name_len;
3752 if (cmp)
3753 continue;
3754
3755 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3756 xh,
3757 i,
3758 &block_off,
3759 &new_offset);
3760 if (ret) {
3761 mlog_errno(ret);
3762 break;
3763 }
3764
3765
3766 xe_name = bucket_block(bucket, block_off) + new_offset;
3767 if (!memcmp(name, xe_name, name_len)) {
3768 *xe_index = i;
3769 *found = 1;
3770 ret = 0;
3771 break;
3772 }
3773 }
3774
3775 return ret;
3776 }
3777
3778 /*
3779 * Find the specified xattr entry in a series of buckets.
3780 * This series start from p_blkno and last for num_clusters.
3781 * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
3782 * the num of the valid buckets.
3783 *
3784 * Return the buffer_head this xattr should reside in. And if the xattr's
3785 * hash is in the gap of 2 buckets, return the lower bucket.
3786 */
3787 static int ocfs2_xattr_bucket_find(struct inode *inode,
3788 int name_index,
3789 const char *name,
3790 u32 name_hash,
3791 u64 p_blkno,
3792 u32 first_hash,
3793 u32 num_clusters,
3794 struct ocfs2_xattr_search *xs)
3795 {
3796 int ret, found = 0;
3797 struct ocfs2_xattr_header *xh = NULL;
3798 struct ocfs2_xattr_entry *xe = NULL;
3799 u16 index = 0;
3800 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3801 int low_bucket = 0, bucket, high_bucket;
3802 struct ocfs2_xattr_bucket *search;
3803 u32 last_hash;
3804 u64 blkno, lower_blkno = 0;
3805
3806 search = ocfs2_xattr_bucket_new(inode);
3807 if (!search) {
3808 ret = -ENOMEM;
3809 mlog_errno(ret);
3810 goto out;
3811 }
3812
3813 ret = ocfs2_read_xattr_bucket(search, p_blkno);
3814 if (ret) {
3815 mlog_errno(ret);
3816 goto out;
3817 }
3818
3819 xh = bucket_xh(search);
3820 high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
3821 while (low_bucket <= high_bucket) {
3822 ocfs2_xattr_bucket_relse(search);
3823
3824 bucket = (low_bucket + high_bucket) / 2;
3825 blkno = p_blkno + bucket * blk_per_bucket;
3826 ret = ocfs2_read_xattr_bucket(search, blkno);
3827 if (ret) {
3828 mlog_errno(ret);
3829 goto out;
3830 }
3831
3832 xh = bucket_xh(search);
3833 xe = &xh->xh_entries[0];
3834 if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
3835 high_bucket = bucket - 1;
3836 continue;
3837 }
3838
3839 /*
3840 * Check whether the hash of the last entry in our
3841 * bucket is larger than the search one. for an empty
3842 * bucket, the last one is also the first one.
3843 */
3844 if (xh->xh_count)
3845 xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
3846
3847 last_hash = le32_to_cpu(xe->xe_name_hash);
3848
3849 /* record lower_blkno which may be the insert place. */
3850 lower_blkno = blkno;
3851
3852 if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
3853 low_bucket = bucket + 1;
3854 continue;
3855 }
3856
3857 /* the searched xattr should reside in this bucket if exists. */
3858 ret = ocfs2_find_xe_in_bucket(inode, search,
3859 name_index, name, name_hash,
3860 &index, &found);
3861 if (ret) {
3862 mlog_errno(ret);
3863 goto out;
3864 }
3865 break;
3866 }
3867
3868 /*
3869 * Record the bucket we have found.
3870 * When the xattr's hash value is in the gap of 2 buckets, we will
3871 * always set it to the previous bucket.
3872 */
3873 if (!lower_blkno)
3874 lower_blkno = p_blkno;
3875
3876 /* This should be in cache - we just read it during the search */
3877 ret = ocfs2_read_xattr_bucket(xs->bucket, lower_blkno);
3878 if (ret) {
3879 mlog_errno(ret);
3880 goto out;
3881 }
3882
3883 xs->header = bucket_xh(xs->bucket);
3884 xs->base = bucket_block(xs->bucket, 0);
3885 xs->end = xs->base + inode->i_sb->s_blocksize;
3886
3887 if (found) {
3888 xs->here = &xs->header->xh_entries[index];
3889 trace_ocfs2_xattr_bucket_find(OCFS2_I(inode)->ip_blkno,
3890 name, name_index, name_hash,
3891 (unsigned long long)bucket_blkno(xs->bucket),
3892 index);
3893 } else
3894 ret = -ENODATA;
3895
3896 out:
3897 ocfs2_xattr_bucket_free(search);
3898 return ret;
3899 }
3900
3901 static int ocfs2_xattr_index_block_find(struct inode *inode,
3902 struct buffer_head *root_bh,
3903 int name_index,
3904 const char *name,
3905 struct ocfs2_xattr_search *xs)
3906 {
3907 int ret;
3908 struct ocfs2_xattr_block *xb =
3909 (struct ocfs2_xattr_block *)root_bh->b_data;
3910 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3911 struct ocfs2_extent_list *el = &xb_root->xt_list;
3912 u64 p_blkno = 0;
3913 u32 first_hash, num_clusters = 0;
3914 u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
3915
3916 if (le16_to_cpu(el->l_next_free_rec) == 0)
3917 return -ENODATA;
3918
3919 trace_ocfs2_xattr_index_block_find(OCFS2_I(inode)->ip_blkno,
3920 name, name_index, name_hash,
3921 (unsigned long long)root_bh->b_blocknr,
3922 -1);
3923
3924 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
3925 &num_clusters, el);
3926 if (ret) {
3927 mlog_errno(ret);
3928 goto out;
3929 }
3930
3931 BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
3932
3933 trace_ocfs2_xattr_index_block_find_rec(OCFS2_I(inode)->ip_blkno,
3934 name, name_index, first_hash,
3935 (unsigned long long)p_blkno,
3936 num_clusters);
3937
3938 ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
3939 p_blkno, first_hash, num_clusters, xs);
3940
3941 out:
3942 return ret;
3943 }
3944
3945 static int ocfs2_iterate_xattr_buckets(struct inode *inode,
3946 u64 blkno,
3947 u32 clusters,
3948 xattr_bucket_func *func,
3949 void *para)
3950 {
3951 int i, ret = 0;
3952 u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
3953 u32 num_buckets = clusters * bpc;
3954 struct ocfs2_xattr_bucket *bucket;
3955
3956 bucket = ocfs2_xattr_bucket_new(inode);
3957 if (!bucket) {
3958 mlog_errno(-ENOMEM);
3959 return -ENOMEM;
3960 }
3961
3962 trace_ocfs2_iterate_xattr_buckets(
3963 (unsigned long long)OCFS2_I(inode)->ip_blkno,
3964 (unsigned long long)blkno, clusters);
3965
3966 for (i = 0; i < num_buckets; i++, blkno += bucket->bu_blocks) {
3967 ret = ocfs2_read_xattr_bucket(bucket, blkno);
3968 if (ret) {
3969 mlog_errno(ret);
3970 break;
3971 }
3972
3973 /*
3974 * The real bucket num in this series of blocks is stored
3975 * in the 1st bucket.
3976 */
3977 if (i == 0)
3978 num_buckets = le16_to_cpu(bucket_xh(bucket)->xh_num_buckets);
3979
3980 trace_ocfs2_iterate_xattr_bucket((unsigned long long)blkno,
3981 le32_to_cpu(bucket_xh(bucket)->xh_entries[0].xe_name_hash));
3982 if (func) {
3983 ret = func(inode, bucket, para);
3984 if (ret && ret != -ERANGE)
3985 mlog_errno(ret);
3986 /* Fall through to bucket_relse() */
3987 }
3988
3989 ocfs2_xattr_bucket_relse(bucket);
3990 if (ret)
3991 break;
3992 }
3993
3994 ocfs2_xattr_bucket_free(bucket);
3995 return ret;
3996 }
3997
3998 struct ocfs2_xattr_tree_list {
3999 char *buffer;
4000 size_t buffer_size;
4001 size_t result;
4002 };
4003
4004 static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
4005 struct ocfs2_xattr_header *xh,
4006 int index,
4007 int *block_off,
4008 int *new_offset)
4009 {
4010 u16 name_offset;
4011
4012 if (index < 0 || index >= le16_to_cpu(xh->xh_count))
4013 return -EINVAL;
4014
4015 name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
4016
4017 *block_off = name_offset >> sb->s_blocksize_bits;
4018 *new_offset = name_offset % sb->s_blocksize;
4019
4020 return 0;
4021 }
4022
4023 static int ocfs2_list_xattr_bucket(struct inode *inode,
4024 struct ocfs2_xattr_bucket *bucket,
4025 void *para)
4026 {
4027 int ret = 0, type;
4028 struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
4029 int i, block_off, new_offset;
4030 const char *prefix, *name;
4031
4032 for (i = 0 ; i < le16_to_cpu(bucket_xh(bucket)->xh_count); i++) {
4033 struct ocfs2_xattr_entry *entry = &bucket_xh(bucket)->xh_entries[i];
4034 type = ocfs2_xattr_get_type(entry);
4035 prefix = ocfs2_xattr_prefix(type);
4036
4037 if (prefix) {
4038 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
4039 bucket_xh(bucket),
4040 i,
4041 &block_off,
4042 &new_offset);
4043 if (ret)
4044 break;
4045
4046 name = (const char *)bucket_block(bucket, block_off) +
4047 new_offset;
4048 ret = ocfs2_xattr_list_entry(xl->buffer,
4049 xl->buffer_size,
4050 &xl->result,
4051 prefix, name,
4052 entry->xe_name_len);
4053 if (ret)
4054 break;
4055 }
4056 }
4057
4058 return ret;
4059 }
4060
4061 static int ocfs2_iterate_xattr_index_block(struct inode *inode,
4062 struct buffer_head *blk_bh,
4063 xattr_tree_rec_func *rec_func,
4064 void *para)
4065 {
4066 struct ocfs2_xattr_block *xb =
4067 (struct ocfs2_xattr_block *)blk_bh->b_data;
4068 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
4069 int ret = 0;
4070 u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
4071 u64 p_blkno = 0;
4072
4073 if (!el->l_next_free_rec || !rec_func)
4074 return 0;
4075
4076 while (name_hash > 0) {
4077 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
4078 &e_cpos, &num_clusters, el);
4079 if (ret) {
4080 mlog_errno(ret);
4081 break;
4082 }
4083
4084 ret = rec_func(inode, blk_bh, p_blkno, e_cpos,
4085 num_clusters, para);
4086 if (ret) {
4087 if (ret != -ERANGE)
4088 mlog_errno(ret);
4089 break;
4090 }
4091
4092 if (e_cpos == 0)
4093 break;
4094
4095 name_hash = e_cpos - 1;
4096 }
4097
4098 return ret;
4099
4100 }
4101
4102 static int ocfs2_list_xattr_tree_rec(struct inode *inode,
4103 struct buffer_head *root_bh,
4104 u64 blkno, u32 cpos, u32 len, void *para)
4105 {
4106 return ocfs2_iterate_xattr_buckets(inode, blkno, len,
4107 ocfs2_list_xattr_bucket, para);
4108 }
4109
4110 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
4111 struct buffer_head *blk_bh,
4112 char *buffer,
4113 size_t buffer_size)
4114 {
4115 int ret;
4116 struct ocfs2_xattr_tree_list xl = {
4117 .buffer = buffer,
4118 .buffer_size = buffer_size,
4119 .result = 0,
4120 };
4121
4122 ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
4123 ocfs2_list_xattr_tree_rec, &xl);
4124 if (ret) {
4125 mlog_errno(ret);
4126 goto out;
4127 }
4128
4129 ret = xl.result;
4130 out:
4131 return ret;
4132 }
4133
4134 static int cmp_xe(const void *a, const void *b)
4135 {
4136 const struct ocfs2_xattr_entry *l = a, *r = b;
4137 u32 l_hash = le32_to_cpu(l->xe_name_hash);
4138 u32 r_hash = le32_to_cpu(r->xe_name_hash);
4139
4140 if (l_hash > r_hash)
4141 return 1;
4142 if (l_hash < r_hash)
4143 return -1;
4144 return 0;
4145 }
4146
4147 static void swap_xe(void *a, void *b, int size)
4148 {
4149 struct ocfs2_xattr_entry *l = a, *r = b, tmp;
4150
4151 tmp = *l;
4152 memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
4153 memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
4154 }
4155
4156 /*
4157 * When the ocfs2_xattr_block is filled up, new bucket will be created
4158 * and all the xattr entries will be moved to the new bucket.
4159 * The header goes at the start of the bucket, and the names+values are
4160 * filled from the end. This is why *target starts as the last buffer.
4161 * Note: we need to sort the entries since they are not saved in order
4162 * in the ocfs2_xattr_block.
4163 */
4164 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
4165 struct buffer_head *xb_bh,
4166 struct ocfs2_xattr_bucket *bucket)
4167 {
4168 int i, blocksize = inode->i_sb->s_blocksize;
4169 int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4170 u16 offset, size, off_change;
4171 struct ocfs2_xattr_entry *xe;
4172 struct ocfs2_xattr_block *xb =
4173 (struct ocfs2_xattr_block *)xb_bh->b_data;
4174 struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
4175 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
4176 u16 count = le16_to_cpu(xb_xh->xh_count);
4177 char *src = xb_bh->b_data;
4178 char *target = bucket_block(bucket, blks - 1);
4179
4180 trace_ocfs2_cp_xattr_block_to_bucket_begin(
4181 (unsigned long long)xb_bh->b_blocknr,
4182 (unsigned long long)bucket_blkno(bucket));
4183
4184 for (i = 0; i < blks; i++)
4185 memset(bucket_block(bucket, i), 0, blocksize);
4186
4187 /*
4188 * Since the xe_name_offset is based on ocfs2_xattr_header,
4189 * there is a offset change corresponding to the change of
4190 * ocfs2_xattr_header's position.
4191 */
4192 off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
4193 xe = &xb_xh->xh_entries[count - 1];
4194 offset = le16_to_cpu(xe->xe_name_offset) + off_change;
4195 size = blocksize - offset;
4196
4197 /* copy all the names and values. */
4198 memcpy(target + offset, src + offset, size);
4199
4200 /* Init new header now. */
4201 xh->xh_count = xb_xh->xh_count;
4202 xh->xh_num_buckets = cpu_to_le16(1);
4203 xh->xh_name_value_len = cpu_to_le16(size);
4204 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
4205
4206 /* copy all the entries. */
4207 target = bucket_block(bucket, 0);
4208 offset = offsetof(struct ocfs2_xattr_header, xh_entries);
4209 size = count * sizeof(struct ocfs2_xattr_entry);
4210 memcpy(target + offset, (char *)xb_xh + offset, size);
4211
4212 /* Change the xe offset for all the xe because of the move. */
4213 off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
4214 offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
4215 for (i = 0; i < count; i++)
4216 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
4217
4218 trace_ocfs2_cp_xattr_block_to_bucket_end(offset, size, off_change);
4219
4220 sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
4221 cmp_xe, swap_xe);
4222 }
4223
4224 /*
4225 * After we move xattr from block to index btree, we have to
4226 * update ocfs2_xattr_search to the new xe and base.
4227 *
4228 * When the entry is in xattr block, xattr_bh indicates the storage place.
4229 * While if the entry is in index b-tree, "bucket" indicates the
4230 * real place of the xattr.
4231 */
4232 static void ocfs2_xattr_update_xattr_search(struct inode *inode,
4233 struct ocfs2_xattr_search *xs,
4234 struct buffer_head *old_bh)
4235 {
4236 char *buf = old_bh->b_data;
4237 struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
4238 struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
4239 int i;
4240
4241 xs->header = bucket_xh(xs->bucket);
4242 xs->base = bucket_block(xs->bucket, 0);
4243 xs->end = xs->base + inode->i_sb->s_blocksize;
4244
4245 if (xs->not_found)
4246 return;
4247
4248 i = xs->here - old_xh->xh_entries;
4249 xs->here = &xs->header->xh_entries[i];
4250 }
4251
4252 static int ocfs2_xattr_create_index_block(struct inode *inode,
4253 struct ocfs2_xattr_search *xs,
4254 struct ocfs2_xattr_set_ctxt *ctxt)
4255 {
4256 int ret;
4257 u32 bit_off, len;
4258 u64 blkno;
4259 handle_t *handle = ctxt->handle;
4260 struct ocfs2_inode_info *oi = OCFS2_I(inode);
4261 struct buffer_head *xb_bh = xs->xattr_bh;
4262 struct ocfs2_xattr_block *xb =
4263 (struct ocfs2_xattr_block *)xb_bh->b_data;
4264 struct ocfs2_xattr_tree_root *xr;
4265 u16 xb_flags = le16_to_cpu(xb->xb_flags);
4266
4267 trace_ocfs2_xattr_create_index_block_begin(
4268 (unsigned long long)xb_bh->b_blocknr);
4269
4270 BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
4271 BUG_ON(!xs->bucket);
4272
4273 /*
4274 * XXX:
4275 * We can use this lock for now, and maybe move to a dedicated mutex
4276 * if performance becomes a problem later.
4277 */
4278 down_write(&oi->ip_alloc_sem);
4279
4280 ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), xb_bh,
4281 OCFS2_JOURNAL_ACCESS_WRITE);
4282 if (ret) {
4283 mlog_errno(ret);
4284 goto out;
4285 }
4286
4287 ret = __ocfs2_claim_clusters(handle, ctxt->data_ac,
4288 1, 1, &bit_off, &len);
4289 if (ret) {
4290 mlog_errno(ret);
4291 goto out;
4292 }
4293
4294 /*
4295 * The bucket may spread in many blocks, and
4296 * we will only touch the 1st block and the last block
4297 * in the whole bucket(one for entry and one for data).
4298 */
4299 blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
4300
4301 trace_ocfs2_xattr_create_index_block((unsigned long long)blkno);
4302
4303 ret = ocfs2_init_xattr_bucket(xs->bucket, blkno);
4304 if (ret) {
4305 mlog_errno(ret);
4306 goto out;
4307 }
4308
4309 ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
4310 OCFS2_JOURNAL_ACCESS_CREATE);
4311 if (ret) {
4312 mlog_errno(ret);
4313 goto out;
4314 }
4315
4316 ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xs->bucket);
4317 ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
4318
4319 ocfs2_xattr_update_xattr_search(inode, xs, xb_bh);
4320
4321 /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
4322 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
4323 offsetof(struct ocfs2_xattr_block, xb_attrs));
4324
4325 xr = &xb->xb_attrs.xb_root;
4326 xr->xt_clusters = cpu_to_le32(1);
4327 xr->xt_last_eb_blk = 0;
4328 xr->xt_list.l_tree_depth = 0;
4329 xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
4330 xr->xt_list.l_next_free_rec = cpu_to_le16(1);
4331
4332 xr->xt_list.l_recs[0].e_cpos = 0;
4333 xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
4334 xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
4335
4336 xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
4337
4338 ocfs2_journal_dirty(handle, xb_bh);
4339
4340 out:
4341 up_write(&oi->ip_alloc_sem);
4342
4343 return ret;
4344 }
4345
4346 static int cmp_xe_offset(const void *a, const void *b)
4347 {
4348 const struct ocfs2_xattr_entry *l = a, *r = b;
4349 u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
4350 u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
4351
4352 if (l_name_offset < r_name_offset)
4353 return 1;
4354 if (l_name_offset > r_name_offset)
4355 return -1;
4356 return 0;
4357 }
4358
4359 /*
4360 * defrag a xattr bucket if we find that the bucket has some
4361 * holes beteen name/value pairs.
4362 * We will move all the name/value pairs to the end of the bucket
4363 * so that we can spare some space for insertion.
4364 */
4365 static int ocfs2_defrag_xattr_bucket(struct inode *inode,
4366 handle_t *handle,
4367 struct ocfs2_xattr_bucket *bucket)
4368 {
4369 int ret, i;
4370 size_t end, offset, len;
4371 struct ocfs2_xattr_header *xh;
4372 char *entries, *buf, *bucket_buf = NULL;
4373 u64 blkno = bucket_blkno(bucket);
4374 u16 xh_free_start;
4375 size_t blocksize = inode->i_sb->s_blocksize;
4376 struct ocfs2_xattr_entry *xe;
4377
4378 /*
4379 * In order to make the operation more efficient and generic,
4380 * we copy all the blocks into a contiguous memory and do the
4381 * defragment there, so if anything is error, we will not touch
4382 * the real block.
4383 */
4384 bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
4385 if (!bucket_buf) {
4386 ret = -EIO;
4387 goto out;
4388 }
4389
4390 buf = bucket_buf;
4391 for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
4392 memcpy(buf, bucket_block(bucket, i), blocksize);
4393
4394 ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
4395 OCFS2_JOURNAL_ACCESS_WRITE);
4396 if (ret < 0) {
4397 mlog_errno(ret);
4398 goto out;
4399 }
4400
4401 xh = (struct ocfs2_xattr_header *)bucket_buf;
4402 entries = (char *)xh->xh_entries;
4403 xh_free_start = le16_to_cpu(xh->xh_free_start);
4404
4405 trace_ocfs2_defrag_xattr_bucket(
4406 (unsigned long long)blkno, le16_to_cpu(xh->xh_count),
4407 xh_free_start, le16_to_cpu(xh->xh_name_value_len));
4408
4409 /*
4410 * sort all the entries by their offset.
4411 * the largest will be the first, so that we can
4412 * move them to the end one by one.
4413 */
4414 sort(entries, le16_to_cpu(xh->xh_count),
4415 sizeof(struct ocfs2_xattr_entry),
4416 cmp_xe_offset, swap_xe);
4417
4418 /* Move all name/values to the end of the bucket. */
4419 xe = xh->xh_entries;
4420 end = OCFS2_XATTR_BUCKET_SIZE;
4421 for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
4422 offset = le16_to_cpu(xe->xe_name_offset);
4423 len = namevalue_size_xe(xe);
4424
4425 /*
4426 * We must make sure that the name/value pair
4427 * exist in the same block. So adjust end to
4428 * the previous block end if needed.
4429 */
4430 if (((end - len) / blocksize !=
4431 (end - 1) / blocksize))
4432 end = end - end % blocksize;
4433
4434 if (end > offset + len) {
4435 memmove(bucket_buf + end - len,
4436 bucket_buf + offset, len);
4437 xe->xe_name_offset = cpu_to_le16(end - len);
4438 }
4439
4440 mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
4441 "bucket %llu\n", (unsigned long long)blkno);
4442
4443 end -= len;
4444 }
4445
4446 mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
4447 "bucket %llu\n", (unsigned long long)blkno);
4448
4449 if (xh_free_start == end)
4450 goto out;
4451
4452 memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
4453 xh->xh_free_start = cpu_to_le16(end);
4454
4455 /* sort the entries by their name_hash. */
4456 sort(entries, le16_to_cpu(xh->xh_count),
4457 sizeof(struct ocfs2_xattr_entry),
4458 cmp_xe, swap_xe);
4459
4460 buf = bucket_buf;
4461 for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
4462 memcpy(bucket_block(bucket, i), buf, blocksize);
4463 ocfs2_xattr_bucket_journal_dirty(handle, bucket);
4464
4465 out:
4466 kfree(bucket_buf);
4467 return ret;
4468 }
4469
4470 /*
4471 * prev_blkno points to the start of an existing extent. new_blkno
4472 * points to a newly allocated extent. Because we know each of our
4473 * clusters contains more than bucket, we can easily split one cluster
4474 * at a bucket boundary. So we take the last cluster of the existing
4475 * extent and split it down the middle. We move the last half of the
4476 * buckets in the last cluster of the existing extent over to the new
4477 * extent.
4478 *
4479 * first_bh is the buffer at prev_blkno so we can update the existing
4480 * extent's bucket count. header_bh is the bucket were we were hoping
4481 * to insert our xattr. If the bucket move places the target in the new
4482 * extent, we'll update first_bh and header_bh after modifying the old
4483 * extent.
4484 *
4485 * first_hash will be set as the 1st xe's name_hash in the new extent.
4486 */
4487 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
4488 handle_t *handle,
4489 struct ocfs2_xattr_bucket *first,
4490 struct ocfs2_xattr_bucket *target,
4491 u64 new_blkno,
4492 u32 num_clusters,
4493 u32 *first_hash)
4494 {
4495 int ret;
4496 struct super_block *sb = inode->i_sb;
4497 int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(sb);
4498 int num_buckets = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(sb));
4499 int to_move = num_buckets / 2;
4500 u64 src_blkno;
4501 u64 last_cluster_blkno = bucket_blkno(first) +
4502 ((num_clusters - 1) * ocfs2_clusters_to_blocks(sb, 1));
4503
4504 BUG_ON(le16_to_cpu(bucket_xh(first)->xh_num_buckets) < num_buckets);
4505 BUG_ON(OCFS2_XATTR_BUCKET_SIZE == OCFS2_SB(sb)->s_clustersize);
4506
4507 trace_ocfs2_mv_xattr_bucket_cross_cluster(
4508 (unsigned long long)last_cluster_blkno,
4509 (unsigned long long)new_blkno);
4510
4511 ret = ocfs2_mv_xattr_buckets(inode, handle, bucket_blkno(first),
4512 last_cluster_blkno, new_blkno,
4513 to_move, first_hash);
4514 if (ret) {
4515 mlog_errno(ret);
4516 goto out;
4517 }
4518
4519 /* This is the first bucket that got moved */
4520 src_blkno = last_cluster_blkno + (to_move * blks_per_bucket);
4521
4522 /*
4523 * If the target bucket was part of the moved buckets, we need to
4524 * update first and target.
4525 */
4526 if (bucket_blkno(target) >= src_blkno) {
4527 /* Find the block for the new target bucket */
4528 src_blkno = new_blkno +
4529 (bucket_blkno(target) - src_blkno);
4530
4531 ocfs2_xattr_bucket_relse(first);
4532 ocfs2_xattr_bucket_relse(target);
4533
4534 /*
4535 * These shouldn't fail - the buffers are in the
4536 * journal from ocfs2_cp_xattr_bucket().
4537 */
4538 ret = ocfs2_read_xattr_bucket(first, new_blkno);
4539 if (ret) {
4540 mlog_errno(ret);
4541 goto out;
4542 }
4543 ret = ocfs2_read_xattr_bucket(target, src_blkno);
4544 if (ret)
4545 mlog_errno(ret);
4546
4547 }
4548
4549 out:
4550 return ret;
4551 }
4552
4553 /*
4554 * Find the suitable pos when we divide a bucket into 2.
4555 * We have to make sure the xattrs with the same hash value exist
4556 * in the same bucket.
4557 *
4558 * If this ocfs2_xattr_header covers more than one hash value, find a
4559 * place where the hash value changes. Try to find the most even split.
4560 * The most common case is that all entries have different hash values,
4561 * and the first check we make will find a place to split.
4562 */
4563 static int ocfs2_xattr_find_divide_pos(struct ocfs2_xattr_header *xh)
4564 {
4565 struct ocfs2_xattr_entry *entries = xh->xh_entries;
4566 int count = le16_to_cpu(xh->xh_count);
4567 int delta, middle = count / 2;
4568
4569 /*
4570 * We start at the middle. Each step gets farther away in both
4571 * directions. We therefore hit the change in hash value
4572 * nearest to the middle. Note that this loop does not execute for
4573 * count < 2.
4574 */
4575 for (delta = 0; delta < middle; delta++) {
4576 /* Let's check delta earlier than middle */
4577 if (cmp_xe(&entries[middle - delta - 1],
4578 &entries[middle - delta]))
4579 return middle - delta;
4580
4581 /* For even counts, don't walk off the end */
4582 if ((middle + delta + 1) == count)
4583 continue;
4584
4585 /* Now try delta past middle */
4586 if (cmp_xe(&entries[middle + delta],
4587 &entries[middle + delta + 1]))
4588 return middle + delta + 1;
4589 }
4590
4591 /* Every entry had the same hash */
4592 return count;
4593 }
4594
4595 /*
4596 * Move some xattrs in old bucket(blk) to new bucket(new_blk).
4597 * first_hash will record the 1st hash of the new bucket.
4598 *
4599 * Normally half of the xattrs will be moved. But we have to make
4600 * sure that the xattrs with the same hash value are stored in the
4601 * same bucket. If all the xattrs in this bucket have the same hash
4602 * value, the new bucket will be initialized as an empty one and the
4603 * first_hash will be initialized as (hash_value+1).
4604 */
4605 static int ocfs2_divide_xattr_bucket(struct inode *inode,
4606 handle_t *handle,
4607 u64 blk,
4608 u64 new_blk,
4609 u32 *first_hash,
4610 int new_bucket_head)
4611 {
4612 int ret, i;
4613 int count, start, len, name_value_len = 0, name_offset = 0;
4614 struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
4615 struct ocfs2_xattr_header *xh;
4616 struct ocfs2_xattr_entry *xe;
4617 int blocksize = inode->i_sb->s_blocksize;
4618
4619 trace_ocfs2_divide_xattr_bucket_begin((unsigned long long)blk,
4620 (unsigned long long)new_blk);
4621
4622 s_bucket = ocfs2_xattr_bucket_new(inode);
4623 t_bucket = ocfs2_xattr_bucket_new(inode);
4624 if (!s_bucket || !t_bucket) {
4625 ret = -ENOMEM;
4626 mlog_errno(ret);
4627 goto out;
4628 }
4629
4630 ret = ocfs2_read_xattr_bucket(s_bucket, blk);
4631 if (ret) {
4632 mlog_errno(ret);
4633 goto out;
4634 }
4635
4636 ret = ocfs2_xattr_bucket_journal_access(handle, s_bucket,
4637 OCFS2_JOURNAL_ACCESS_WRITE);
4638 if (ret) {
4639 mlog_errno(ret);
4640 goto out;
4641 }
4642
4643 /*
4644 * Even if !new_bucket_head, we're overwriting t_bucket. Thus,
4645 * there's no need to read it.
4646 */
4647 ret = ocfs2_init_xattr_bucket(t_bucket, new_blk);
4648 if (ret) {
4649 mlog_errno(ret);
4650 goto out;
4651 }
4652
4653 /*
4654 * Hey, if we're overwriting t_bucket, what difference does
4655 * ACCESS_CREATE vs ACCESS_WRITE make? See the comment in the
4656 * same part of ocfs2_cp_xattr_bucket().
4657 */
4658 ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4659 new_bucket_head ?
4660 OCFS2_JOURNAL_ACCESS_CREATE :
4661 OCFS2_JOURNAL_ACCESS_WRITE);
4662 if (ret) {
4663 mlog_errno(ret);
4664 goto out;
4665 }
4666
4667 xh = bucket_xh(s_bucket);
4668 count = le16_to_cpu(xh->xh_count);
4669 start = ocfs2_xattr_find_divide_pos(xh);
4670
4671 if (start == count) {
4672 xe = &xh->xh_entries[start-1];
4673
4674 /*
4675 * initialized a new empty bucket here.
4676 * The hash value is set as one larger than
4677 * that of the last entry in the previous bucket.
4678 */
4679 for (i = 0; i < t_bucket->bu_blocks; i++)
4680 memset(bucket_block(t_bucket, i), 0, blocksize);
4681
4682 xh = bucket_xh(t_bucket);
4683 xh->xh_free_start = cpu_to_le16(blocksize);
4684 xh->xh_entries[0].xe_name_hash = xe->xe_name_hash;
4685 le32_add_cpu(&xh->xh_entries[0].xe_name_hash, 1);
4686
4687 goto set_num_buckets;
4688 }
4689
4690 /* copy the whole bucket to the new first. */
4691 ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4692
4693 /* update the new bucket. */
4694 xh = bucket_xh(t_bucket);
4695
4696 /*
4697 * Calculate the total name/value len and xh_free_start for
4698 * the old bucket first.
4699 */
4700 name_offset = OCFS2_XATTR_BUCKET_SIZE;
4701 name_value_len = 0;
4702 for (i = 0; i < start; i++) {
4703 xe = &xh->xh_entries[i];
4704 name_value_len += namevalue_size_xe(xe);
4705 if (le16_to_cpu(xe->xe_name_offset) < name_offset)
4706 name_offset = le16_to_cpu(xe->xe_name_offset);
4707 }
4708
4709 /*
4710 * Now begin the modification to the new bucket.
4711 *
4712 * In the new bucket, We just move the xattr entry to the beginning
4713 * and don't touch the name/value. So there will be some holes in the
4714 * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
4715 * called.
4716 */
4717 xe = &xh->xh_entries[start];
4718 len = sizeof(struct ocfs2_xattr_entry) * (count - start);
4719 trace_ocfs2_divide_xattr_bucket_move(len,
4720 (int)((char *)xe - (char *)xh),
4721 (int)((char *)xh->xh_entries - (char *)xh));
4722 memmove((char *)xh->xh_entries, (char *)xe, len);
4723 xe = &xh->xh_entries[count - start];
4724 len = sizeof(struct ocfs2_xattr_entry) * start;
4725 memset((char *)xe, 0, len);
4726
4727 le16_add_cpu(&xh->xh_count, -start);
4728 le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
4729
4730 /* Calculate xh_free_start for the new bucket. */
4731 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
4732 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
4733 xe = &xh->xh_entries[i];
4734 if (le16_to_cpu(xe->xe_name_offset) <
4735 le16_to_cpu(xh->xh_free_start))
4736 xh->xh_free_start = xe->xe_name_offset;
4737 }
4738
4739 set_num_buckets:
4740 /* set xh->xh_num_buckets for the new xh. */
4741 if (new_bucket_head)
4742 xh->xh_num_buckets = cpu_to_le16(1);
4743 else
4744 xh->xh_num_buckets = 0;
4745
4746 ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4747
4748 /* store the first_hash of the new bucket. */
4749 if (first_hash)
4750 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
4751
4752 /*
4753 * Now only update the 1st block of the old bucket. If we
4754 * just added a new empty bucket, there is no need to modify
4755 * it.
4756 */
4757 if (start == count)
4758 goto out;
4759
4760 xh = bucket_xh(s_bucket);
4761 memset(&xh->xh_entries[start], 0,
4762 sizeof(struct ocfs2_xattr_entry) * (count - start));
4763 xh->xh_count = cpu_to_le16(start);
4764 xh->xh_free_start = cpu_to_le16(name_offset);
4765 xh->xh_name_value_len = cpu_to_le16(name_value_len);
4766
4767 ocfs2_xattr_bucket_journal_dirty(handle, s_bucket);
4768
4769 out:
4770 ocfs2_xattr_bucket_free(s_bucket);
4771 ocfs2_xattr_bucket_free(t_bucket);
4772
4773 return ret;
4774 }
4775
4776 /*
4777 * Copy xattr from one bucket to another bucket.
4778 *
4779 * The caller must make sure that the journal transaction
4780 * has enough space for journaling.
4781 */
4782 static int ocfs2_cp_xattr_bucket(struct inode *inode,
4783 handle_t *handle,
4784 u64 s_blkno,
4785 u64 t_blkno,
4786 int t_is_new)
4787 {
4788 int ret;
4789 struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
4790
4791 BUG_ON(s_blkno == t_blkno);
4792
4793 trace_ocfs2_cp_xattr_bucket((unsigned long long)s_blkno,
4794 (unsigned long long)t_blkno,
4795 t_is_new);
4796
4797 s_bucket = ocfs2_xattr_bucket_new(inode);
4798 t_bucket = ocfs2_xattr_bucket_new(inode);
4799 if (!s_bucket || !t_bucket) {
4800 ret = -ENOMEM;
4801 mlog_errno(ret);
4802 goto out;
4803 }
4804
4805 ret = ocfs2_read_xattr_bucket(s_bucket, s_blkno);
4806 if (ret)
4807 goto out;
4808
4809 /*
4810 * Even if !t_is_new, we're overwriting t_bucket. Thus,
4811 * there's no need to read it.
4812 */
4813 ret = ocfs2_init_xattr_bucket(t_bucket, t_blkno);
4814 if (ret)
4815 goto out;
4816
4817 /*
4818 * Hey, if we're overwriting t_bucket, what difference does
4819 * ACCESS_CREATE vs ACCESS_WRITE make? Well, if we allocated a new
4820 * cluster to fill, we came here from
4821 * ocfs2_mv_xattr_buckets(), and it is really new -
4822 * ACCESS_CREATE is required. But we also might have moved data
4823 * out of t_bucket before extending back into it.
4824 * ocfs2_add_new_xattr_bucket() can do this - its call to
4825 * ocfs2_add_new_xattr_cluster() may have created a new extent
4826 * and copied out the end of the old extent. Then it re-extends
4827 * the old extent back to create space for new xattrs. That's
4828 * how we get here, and the bucket isn't really new.
4829 */
4830 ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4831 t_is_new ?
4832 OCFS2_JOURNAL_ACCESS_CREATE :
4833 OCFS2_JOURNAL_ACCESS_WRITE);
4834 if (ret)
4835 goto out;
4836
4837 ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4838 ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4839
4840 out:
4841 ocfs2_xattr_bucket_free(t_bucket);
4842 ocfs2_xattr_bucket_free(s_bucket);
4843
4844 return ret;
4845 }
4846
4847 /*
4848 * src_blk points to the start of an existing extent. last_blk points to
4849 * last cluster in that extent. to_blk points to a newly allocated
4850 * extent. We copy the buckets from the cluster at last_blk to the new
4851 * extent. If start_bucket is non-zero, we skip that many buckets before
4852 * we start copying. The new extent's xh_num_buckets gets set to the
4853 * number of buckets we copied. The old extent's xh_num_buckets shrinks
4854 * by the same amount.
4855 */
4856 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
4857 u64 src_blk, u64 last_blk, u64 to_blk,
4858 unsigned int start_bucket,
4859 u32 *first_hash)
4860 {
4861 int i, ret, credits;
4862 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4863 int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4864 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
4865 struct ocfs2_xattr_bucket *old_first, *new_first;
4866
4867 trace_ocfs2_mv_xattr_buckets((unsigned long long)last_blk,
4868 (unsigned long long)to_blk);
4869
4870 BUG_ON(start_bucket >= num_buckets);
4871 if (start_bucket) {
4872 num_buckets -= start_bucket;
4873 last_blk += (start_bucket * blks_per_bucket);
4874 }
4875
4876 /* The first bucket of the original extent */
4877 old_first = ocfs2_xattr_bucket_new(inode);
4878 /* The first bucket of the new extent */
4879 new_first = ocfs2_xattr_bucket_new(inode);
4880 if (!old_first || !new_first) {
4881 ret = -ENOMEM;
4882 mlog_errno(ret);
4883 goto out;
4884 }
4885
4886 ret = ocfs2_read_xattr_bucket(old_first, src_blk);
4887 if (ret) {
4888 mlog_errno(ret);
4889 goto out;
4890 }
4891
4892 /*
4893 * We need to update the first bucket of the old extent and all
4894 * the buckets going to the new extent.
4895 */
4896 credits = ((num_buckets + 1) * blks_per_bucket);
4897 ret = ocfs2_extend_trans(handle, credits);
4898 if (ret) {
4899 mlog_errno(ret);
4900 goto out;
4901 }
4902
4903 ret = ocfs2_xattr_bucket_journal_access(handle, old_first,
4904 OCFS2_JOURNAL_ACCESS_WRITE);
4905 if (ret) {
4906 mlog_errno(ret);
4907 goto out;
4908 }
4909
4910 for (i = 0; i < num_buckets; i++) {
4911 ret = ocfs2_cp_xattr_bucket(inode, handle,
4912 last_blk + (i * blks_per_bucket),
4913 to_blk + (i * blks_per_bucket),
4914 1);
4915 if (ret) {
4916 mlog_errno(ret);
4917 goto out;
4918 }
4919 }
4920
4921 /*
4922 * Get the new bucket ready before we dirty anything
4923 * (This actually shouldn't fail, because we already dirtied
4924 * it once in ocfs2_cp_xattr_bucket()).
4925 */
4926 ret = ocfs2_read_xattr_bucket(new_first, to_blk);
4927 if (ret) {
4928 mlog_errno(ret);
4929 goto out;
4930 }
4931 ret = ocfs2_xattr_bucket_journal_access(handle, new_first,
4932 OCFS2_JOURNAL_ACCESS_WRITE);
4933 if (ret) {
4934 mlog_errno(ret);
4935 goto out;
4936 }
4937
4938 /* Now update the headers */
4939 le16_add_cpu(&bucket_xh(old_first)->xh_num_buckets, -num_buckets);
4940 ocfs2_xattr_bucket_journal_dirty(handle, old_first);
4941
4942 bucket_xh(new_first)->xh_num_buckets = cpu_to_le16(num_buckets);
4943 ocfs2_xattr_bucket_journal_dirty(handle, new_first);
4944
4945 if (first_hash)
4946 *first_hash = le32_to_cpu(bucket_xh(new_first)->xh_entries[0].xe_name_hash);
4947
4948 out:
4949 ocfs2_xattr_bucket_free(new_first);
4950 ocfs2_xattr_bucket_free(old_first);
4951 return ret;
4952 }
4953
4954 /*
4955 * Move some xattrs in this cluster to the new cluster.
4956 * This function should only be called when bucket size == cluster size.
4957 * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
4958 */
4959 static int ocfs2_divide_xattr_cluster(struct inode *inode,
4960 handle_t *handle,
4961 u64 prev_blk,
4962 u64 new_blk,
4963 u32 *first_hash)
4964 {
4965 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4966 int ret, credits = 2 * blk_per_bucket;
4967
4968 BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
4969
4970 ret = ocfs2_extend_trans(handle, credits);
4971 if (ret) {
4972 mlog_errno(ret);
4973 return ret;
4974 }
4975
4976 /* Move half of the xattr in start_blk to the next bucket. */
4977 return ocfs2_divide_xattr_bucket(inode, handle, prev_blk,
4978 new_blk, first_hash, 1);
4979 }
4980
4981 /*
4982 * Move some xattrs from the old cluster to the new one since they are not
4983 * contiguous in ocfs2 xattr tree.
4984 *
4985 * new_blk starts a new separate cluster, and we will move some xattrs from
4986 * prev_blk to it. v_start will be set as the first name hash value in this
4987 * new cluster so that it can be used as e_cpos during tree insertion and
4988 * don't collide with our original b-tree operations. first_bh and header_bh
4989 * will also be updated since they will be used in ocfs2_extend_xattr_bucket
4990 * to extend the insert bucket.
4991 *
4992 * The problem is how much xattr should we move to the new one and when should
4993 * we update first_bh and header_bh?
4994 * 1. If cluster size > bucket size, that means the previous cluster has more
4995 * than 1 bucket, so just move half nums of bucket into the new cluster and
4996 * update the first_bh and header_bh if the insert bucket has been moved
4997 * to the new cluster.
4998 * 2. If cluster_size == bucket_size:
4999 * a) If the previous extent rec has more than one cluster and the insert
5000 * place isn't in the last cluster, copy the entire last cluster to the
5001 * new one. This time, we don't need to upate the first_bh and header_bh
5002 * since they will not be moved into the new cluster.
5003 * b) Otherwise, move the bottom half of the xattrs in the last cluster into
5004 * the new one. And we set the extend flag to zero if the insert place is
5005 * moved into the new allocated cluster since no extend is needed.
5006 */
5007 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
5008 handle_t *handle,
5009 struct ocfs2_xattr_bucket *first,
5010 struct ocfs2_xattr_bucket *target,
5011 u64 new_blk,
5012 u32 prev_clusters,
5013 u32 *v_start,
5014 int *extend)
5015 {
5016 int ret;
5017
5018 trace_ocfs2_adjust_xattr_cross_cluster(
5019 (unsigned long long)bucket_blkno(first),
5020 (unsigned long long)new_blk, prev_clusters);
5021
5022 if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1) {
5023 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
5024 handle,
5025 first, target,
5026 new_blk,
5027 prev_clusters,
5028 v_start);
5029 if (ret)
5030 mlog_errno(ret);
5031 } else {
5032 /* The start of the last cluster in the first extent */
5033 u64 last_blk = bucket_blkno(first) +
5034 ((prev_clusters - 1) *
5035 ocfs2_clusters_to_blocks(inode->i_sb, 1));
5036
5037 if (prev_clusters > 1 && bucket_blkno(target) != last_blk) {
5038 ret = ocfs2_mv_xattr_buckets(inode, handle,
5039 bucket_blkno(first),
5040 last_blk, new_blk, 0,
5041 v_start);
5042 if (ret)
5043 mlog_errno(ret);
5044 } else {
5045 ret = ocfs2_divide_xattr_cluster(inode, handle,
5046 last_blk, new_blk,
5047 v_start);
5048 if (ret)
5049 mlog_errno(ret);
5050
5051 if ((bucket_blkno(target) == last_blk) && extend)
5052 *extend = 0;
5053 }
5054 }
5055
5056 return ret;
5057 }
5058
5059 /*
5060 * Add a new cluster for xattr storage.
5061 *
5062 * If the new cluster is contiguous with the previous one, it will be
5063 * appended to the same extent record, and num_clusters will be updated.
5064 * If not, we will insert a new extent for it and move some xattrs in
5065 * the last cluster into the new allocated one.
5066 * We also need to limit the maximum size of a btree leaf, otherwise we'll
5067 * lose the benefits of hashing because we'll have to search large leaves.
5068 * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
5069 * if it's bigger).
5070 *
5071 * first_bh is the first block of the previous extent rec and header_bh
5072 * indicates the bucket we will insert the new xattrs. They will be updated
5073 * when the header_bh is moved into the new cluster.
5074 */
5075 static int ocfs2_add_new_xattr_cluster(struct inode *inode,
5076 struct buffer_head *root_bh,
5077 struct ocfs2_xattr_bucket *first,
5078 struct ocfs2_xattr_bucket *target,
5079 u32 *num_clusters,
5080 u32 prev_cpos,
5081 int *extend,
5082 struct ocfs2_xattr_set_ctxt *ctxt)
5083 {
5084 int ret;
5085 u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
5086 u32 prev_clusters = *num_clusters;
5087 u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
5088 u64 block;
5089 handle_t *handle = ctxt->handle;
5090 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5091 struct ocfs2_extent_tree et;
5092
5093 trace_ocfs2_add_new_xattr_cluster_begin(
5094 (unsigned long long)OCFS2_I(inode)->ip_blkno,
5095 (unsigned long long)bucket_blkno(first),
5096 prev_cpos, prev_clusters);
5097
5098 ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
5099
5100 ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
5101 OCFS2_JOURNAL_ACCESS_WRITE);
5102 if (ret < 0) {
5103 mlog_errno(ret);
5104 goto leave;
5105 }
5106
5107 ret = __ocfs2_claim_clusters(handle, ctxt->data_ac, 1,
5108 clusters_to_add, &bit_off, &num_bits);
5109 if (ret < 0) {
5110 if (ret != -ENOSPC)
5111 mlog_errno(ret);
5112 goto leave;
5113 }
5114
5115 BUG_ON(num_bits > clusters_to_add);
5116
5117 block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
5118 trace_ocfs2_add_new_xattr_cluster((unsigned long long)block, num_bits);
5119
5120 if (bucket_blkno(first) + (prev_clusters * bpc) == block &&
5121 (prev_clusters + num_bits) << osb->s_clustersize_bits <=
5122 OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
5123 /*
5124 * If this cluster is contiguous with the old one and
5125 * adding this new cluster, we don't surpass the limit of
5126 * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
5127 * initialized and used like other buckets in the previous
5128 * cluster.
5129 * So add it as a contiguous one. The caller will handle
5130 * its init process.
5131 */
5132 v_start = prev_cpos + prev_clusters;
5133 *num_clusters = prev_clusters + num_bits;
5134 } else {
5135 ret = ocfs2_adjust_xattr_cross_cluster(inode,
5136 handle,
5137 first,
5138 target,
5139 block,
5140 prev_clusters,
5141 &v_start,
5142 extend);
5143 if (ret) {
5144 mlog_errno(ret);
5145 goto leave;
5146 }
5147 }
5148
5149 trace_ocfs2_add_new_xattr_cluster_insert((unsigned long long)block,
5150 v_start, num_bits);
5151 ret = ocfs2_insert_extent(handle, &et, v_start, block,
5152 num_bits, 0, ctxt->meta_ac);
5153 if (ret < 0) {
5154 mlog_errno(ret);
5155 goto leave;
5156 }
5157
5158 ocfs2_journal_dirty(handle, root_bh);
5159
5160 leave:
5161 return ret;
5162 }
5163
5164 /*
5165 * We are given an extent. 'first' is the bucket at the very front of
5166 * the extent. The extent has space for an additional bucket past
5167 * bucket_xh(first)->xh_num_buckets. 'target_blkno' is the block number
5168 * of the target bucket. We wish to shift every bucket past the target
5169 * down one, filling in that additional space. When we get back to the
5170 * target, we split the target between itself and the now-empty bucket
5171 * at target+1 (aka, target_blkno + blks_per_bucket).
5172 */
5173 static int ocfs2_extend_xattr_bucket(struct inode *inode,
5174 handle_t *handle,
5175 struct ocfs2_xattr_bucket *first,
5176 u64 target_blk,
5177 u32 num_clusters)
5178 {
5179 int ret, credits;
5180 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5181 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5182 u64 end_blk;
5183 u16 new_bucket = le16_to_cpu(bucket_xh(first)->xh_num_buckets);
5184
5185 trace_ocfs2_extend_xattr_bucket((unsigned long long)target_blk,
5186 (unsigned long long)bucket_blkno(first),
5187 num_clusters, new_bucket);
5188
5189 /* The extent must have room for an additional bucket */
5190 BUG_ON(new_bucket >=
5191 (num_clusters * ocfs2_xattr_buckets_per_cluster(osb)));
5192
5193 /* end_blk points to the last existing bucket */
5194 end_blk = bucket_blkno(first) + ((new_bucket - 1) * blk_per_bucket);
5195
5196 /*
5197 * end_blk is the start of the last existing bucket.
5198 * Thus, (end_blk - target_blk) covers the target bucket and
5199 * every bucket after it up to, but not including, the last
5200 * existing bucket. Then we add the last existing bucket, the
5201 * new bucket, and the first bucket (3 * blk_per_bucket).
5202 */
5203 credits = (end_blk - target_blk) + (3 * blk_per_bucket);
5204 ret = ocfs2_extend_trans(handle, credits);
5205 if (ret) {
5206 mlog_errno(ret);
5207 goto out;
5208 }
5209
5210 ret = ocfs2_xattr_bucket_journal_access(handle, first,
5211 OCFS2_JOURNAL_ACCESS_WRITE);
5212 if (ret) {
5213 mlog_errno(ret);
5214 goto out;
5215 }
5216
5217 while (end_blk != target_blk) {
5218 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
5219 end_blk + blk_per_bucket, 0);
5220 if (ret)
5221 goto out;
5222 end_blk -= blk_per_bucket;
5223 }
5224
5225 /* Move half of the xattr in target_blkno to the next bucket. */
5226 ret = ocfs2_divide_xattr_bucket(inode, handle, target_blk,
5227 target_blk + blk_per_bucket, NULL, 0);
5228
5229 le16_add_cpu(&bucket_xh(first)->xh_num_buckets, 1);
5230 ocfs2_xattr_bucket_journal_dirty(handle, first);
5231
5232 out:
5233 return ret;
5234 }
5235
5236 /*
5237 * Add new xattr bucket in an extent record and adjust the buckets
5238 * accordingly. xb_bh is the ocfs2_xattr_block, and target is the
5239 * bucket we want to insert into.
5240 *
5241 * In the easy case, we will move all the buckets after target down by
5242 * one. Half of target's xattrs will be moved to the next bucket.
5243 *
5244 * If current cluster is full, we'll allocate a new one. This may not
5245 * be contiguous. The underlying calls will make sure that there is
5246 * space for the insert, shifting buckets around if necessary.
5247 * 'target' may be moved by those calls.
5248 */
5249 static int ocfs2_add_new_xattr_bucket(struct inode *inode,
5250 struct buffer_head *xb_bh,
5251 struct ocfs2_xattr_bucket *target,
5252 struct ocfs2_xattr_set_ctxt *ctxt)
5253 {
5254 struct ocfs2_xattr_block *xb =
5255 (struct ocfs2_xattr_block *)xb_bh->b_data;
5256 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
5257 struct ocfs2_extent_list *el = &xb_root->xt_list;
5258 u32 name_hash =
5259 le32_to_cpu(bucket_xh(target)->xh_entries[0].xe_name_hash);
5260 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5261 int ret, num_buckets, extend = 1;
5262 u64 p_blkno;
5263 u32 e_cpos, num_clusters;
5264 /* The bucket at the front of the extent */
5265 struct ocfs2_xattr_bucket *first;
5266
5267 trace_ocfs2_add_new_xattr_bucket(
5268 (unsigned long long)bucket_blkno(target));
5269
5270 /* The first bucket of the original extent */
5271 first = ocfs2_xattr_bucket_new(inode);
5272 if (!first) {
5273 ret = -ENOMEM;
5274 mlog_errno(ret);
5275 goto out;
5276 }
5277
5278 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
5279 &num_clusters, el);
5280 if (ret) {
5281 mlog_errno(ret);
5282 goto out;
5283 }
5284
5285 ret = ocfs2_read_xattr_bucket(first, p_blkno);
5286 if (ret) {
5287 mlog_errno(ret);
5288 goto out;
5289 }
5290
5291 num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
5292 if (num_buckets == le16_to_cpu(bucket_xh(first)->xh_num_buckets)) {
5293 /*
5294 * This can move first+target if the target bucket moves
5295 * to the new extent.
5296 */
5297 ret = ocfs2_add_new_xattr_cluster(inode,
5298 xb_bh,
5299 first,
5300 target,
5301 &num_clusters,
5302 e_cpos,
5303 &extend,
5304 ctxt);
5305 if (ret) {
5306 mlog_errno(ret);
5307 goto out;
5308 }
5309 }
5310
5311 if (extend) {
5312 ret = ocfs2_extend_xattr_bucket(inode,
5313 ctxt->handle,
5314 first,
5315 bucket_blkno(target),
5316 num_clusters);
5317 if (ret)
5318 mlog_errno(ret);
5319 }
5320
5321 out:
5322 ocfs2_xattr_bucket_free(first);
5323
5324 return ret;
5325 }
5326
5327 static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode,
5328 struct ocfs2_xattr_bucket *bucket,
5329 int offs)
5330 {
5331 int block_off = offs >> inode->i_sb->s_blocksize_bits;
5332
5333 offs = offs % inode->i_sb->s_blocksize;
5334 return bucket_block(bucket, block_off) + offs;
5335 }
5336
5337 /*
5338 * Truncate the specified xe_off entry in xattr bucket.
5339 * bucket is indicated by header_bh and len is the new length.
5340 * Both the ocfs2_xattr_value_root and the entry will be updated here.
5341 *
5342 * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
5343 */
5344 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
5345 struct ocfs2_xattr_bucket *bucket,
5346 int xe_off,
5347 int len,
5348 struct ocfs2_xattr_set_ctxt *ctxt)
5349 {
5350 int ret, offset;
5351 u64 value_blk;
5352 struct ocfs2_xattr_entry *xe;
5353 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5354 size_t blocksize = inode->i_sb->s_blocksize;
5355 struct ocfs2_xattr_value_buf vb = {
5356 .vb_access = ocfs2_journal_access,
5357 };
5358
5359 xe = &xh->xh_entries[xe_off];
5360
5361 BUG_ON(!xe || ocfs2_xattr_is_local(xe));
5362
5363 offset = le16_to_cpu(xe->xe_name_offset) +
5364 OCFS2_XATTR_SIZE(xe->xe_name_len);
5365
5366 value_blk = offset / blocksize;
5367
5368 /* We don't allow ocfs2_xattr_value to be stored in different block. */
5369 BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
5370
5371 vb.vb_bh = bucket->bu_bhs[value_blk];
5372 BUG_ON(!vb.vb_bh);
5373
5374 vb.vb_xv = (struct ocfs2_xattr_value_root *)
5375 (vb.vb_bh->b_data + offset % blocksize);
5376
5377 /*
5378 * From here on out we have to dirty the bucket. The generic
5379 * value calls only modify one of the bucket's bhs, but we need
5380 * to send the bucket at once. So if they error, they *could* have
5381 * modified something. We have to assume they did, and dirty
5382 * the whole bucket. This leaves us in a consistent state.
5383 */
5384 trace_ocfs2_xattr_bucket_value_truncate(
5385 (unsigned long long)bucket_blkno(bucket), xe_off, len);
5386 ret = ocfs2_xattr_value_truncate(inode, &vb, len, ctxt);
5387 if (ret) {
5388 mlog_errno(ret);
5389 goto out;
5390 }
5391
5392 ret = ocfs2_xattr_bucket_journal_access(ctxt->handle, bucket,
5393 OCFS2_JOURNAL_ACCESS_WRITE);
5394 if (ret) {
5395 mlog_errno(ret);
5396 goto out;
5397 }
5398
5399 xe->xe_value_size = cpu_to_le64(len);
5400
5401 ocfs2_xattr_bucket_journal_dirty(ctxt->handle, bucket);
5402
5403 out:
5404 return ret;
5405 }
5406
5407 static int ocfs2_rm_xattr_cluster(struct inode *inode,
5408 struct buffer_head *root_bh,
5409 u64 blkno,
5410 u32 cpos,
5411 u32 len,
5412 void *para)
5413 {
5414 int ret;
5415 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5416 struct inode *tl_inode = osb->osb_tl_inode;
5417 handle_t *handle;
5418 struct ocfs2_xattr_block *xb =
5419 (struct ocfs2_xattr_block *)root_bh->b_data;
5420 struct ocfs2_alloc_context *meta_ac = NULL;
5421 struct ocfs2_cached_dealloc_ctxt dealloc;
5422 struct ocfs2_extent_tree et;
5423
5424 ret = ocfs2_iterate_xattr_buckets(inode, blkno, len,
5425 ocfs2_delete_xattr_in_bucket, para);
5426 if (ret) {
5427 mlog_errno(ret);
5428 return ret;
5429 }
5430
5431 ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
5432
5433 ocfs2_init_dealloc_ctxt(&dealloc);
5434
5435 trace_ocfs2_rm_xattr_cluster(
5436 (unsigned long long)OCFS2_I(inode)->ip_blkno,
5437 (unsigned long long)blkno, cpos, len);
5438
5439 ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode), blkno,
5440 len);
5441
5442 ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
5443 if (ret) {
5444 mlog_errno(ret);
5445 return ret;
5446 }
5447
5448 mutex_lock(&tl_inode->i_mutex);
5449
5450 if (ocfs2_truncate_log_needs_flush(osb)) {
5451 ret = __ocfs2_flush_truncate_log(osb);
5452 if (ret < 0) {
5453 mlog_errno(ret);
5454 goto out;
5455 }
5456 }
5457
5458 handle = ocfs2_start_trans(osb, ocfs2_remove_extent_credits(osb->sb));
5459 if (IS_ERR(handle)) {
5460 ret = -ENOMEM;
5461 mlog_errno(ret);
5462 goto out;
5463 }
5464
5465 ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
5466 OCFS2_JOURNAL_ACCESS_WRITE);
5467 if (ret) {
5468 mlog_errno(ret);
5469 goto out_commit;
5470 }
5471
5472 ret = ocfs2_remove_extent(handle, &et, cpos, len, meta_ac,
5473 &dealloc);
5474 if (ret) {
5475 mlog_errno(ret);
5476 goto out_commit;
5477 }
5478
5479 le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
5480 ocfs2_journal_dirty(handle, root_bh);
5481
5482 ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
5483 if (ret)
5484 mlog_errno(ret);
5485
5486 out_commit:
5487 ocfs2_commit_trans(osb, handle);
5488 out:
5489 ocfs2_schedule_truncate_log_flush(osb, 1);
5490
5491 mutex_unlock(&tl_inode->i_mutex);
5492
5493 if (meta_ac)
5494 ocfs2_free_alloc_context(meta_ac);
5495
5496 ocfs2_run_deallocs(osb, &dealloc);
5497
5498 return ret;
5499 }
5500
5501 /*
5502 * check whether the xattr bucket is filled up with the same hash value.
5503 * If we want to insert the xattr with the same hash, return -ENOSPC.
5504 * If we want to insert a xattr with different hash value, go ahead
5505 * and ocfs2_divide_xattr_bucket will handle this.
5506 */
5507 static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
5508 struct ocfs2_xattr_bucket *bucket,
5509 const char *name)
5510 {
5511 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5512 u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
5513
5514 if (name_hash != le32_to_cpu(xh->xh_entries[0].xe_name_hash))
5515 return 0;
5516
5517 if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
5518 xh->xh_entries[0].xe_name_hash) {
5519 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
5520 "hash = %u\n",
5521 (unsigned long long)bucket_blkno(bucket),
5522 le32_to_cpu(xh->xh_entries[0].xe_name_hash));
5523 return -ENOSPC;
5524 }
5525
5526 return 0;
5527 }
5528
5529 /*
5530 * Try to set the entry in the current bucket. If we fail, the caller
5531 * will handle getting us another bucket.
5532 */
5533 static int ocfs2_xattr_set_entry_bucket(struct inode *inode,
5534 struct ocfs2_xattr_info *xi,
5535 struct ocfs2_xattr_search *xs,
5536 struct ocfs2_xattr_set_ctxt *ctxt)
5537 {
5538 int ret;
5539 struct ocfs2_xa_loc loc;
5540
5541 trace_ocfs2_xattr_set_entry_bucket(xi->xi_name);
5542
5543 ocfs2_init_xattr_bucket_xa_loc(&loc, xs->bucket,
5544 xs->not_found ? NULL : xs->here);
5545 ret = ocfs2_xa_set(&loc, xi, ctxt);
5546 if (!ret) {
5547 xs->here = loc.xl_entry;
5548 goto out;
5549 }
5550 if (ret != -ENOSPC) {
5551 mlog_errno(ret);
5552 goto out;
5553 }
5554
5555 /* Ok, we need space. Let's try defragmenting the bucket. */
5556 ret = ocfs2_defrag_xattr_bucket(inode, ctxt->handle,
5557 xs->bucket);
5558 if (ret) {
5559 mlog_errno(ret);
5560 goto out;
5561 }
5562
5563 ret = ocfs2_xa_set(&loc, xi, ctxt);
5564 if (!ret) {
5565 xs->here = loc.xl_entry;
5566 goto out;
5567 }
5568 if (ret != -ENOSPC)
5569 mlog_errno(ret);
5570
5571
5572 out:
5573 return ret;
5574 }
5575
5576 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
5577 struct ocfs2_xattr_info *xi,
5578 struct ocfs2_xattr_search *xs,
5579 struct ocfs2_xattr_set_ctxt *ctxt)
5580 {
5581 int ret;
5582
5583 trace_ocfs2_xattr_set_entry_index_block(xi->xi_name);
5584
5585 ret = ocfs2_xattr_set_entry_bucket(inode, xi, xs, ctxt);
5586 if (!ret)
5587 goto out;
5588 if (ret != -ENOSPC) {
5589 mlog_errno(ret);
5590 goto out;
5591 }
5592
5593 /* Ack, need more space. Let's try to get another bucket! */
5594
5595 /*
5596 * We do not allow for overlapping ranges between buckets. And
5597 * the maximum number of collisions we will allow for then is
5598 * one bucket's worth, so check it here whether we need to
5599 * add a new bucket for the insert.
5600 */
5601 ret = ocfs2_check_xattr_bucket_collision(inode,
5602 xs->bucket,
5603 xi->xi_name);
5604 if (ret) {
5605 mlog_errno(ret);
5606 goto out;
5607 }
5608
5609 ret = ocfs2_add_new_xattr_bucket(inode,
5610 xs->xattr_bh,
5611 xs->bucket,
5612 ctxt);
5613 if (ret) {
5614 mlog_errno(ret);
5615 goto out;
5616 }
5617
5618 /*
5619 * ocfs2_add_new_xattr_bucket() will have updated
5620 * xs->bucket if it moved, but it will not have updated
5621 * any of the other search fields. Thus, we drop it and
5622 * re-search. Everything should be cached, so it'll be
5623 * quick.
5624 */
5625 ocfs2_xattr_bucket_relse(xs->bucket);
5626 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
5627 xi->xi_name_index,
5628 xi->xi_name, xs);
5629 if (ret && ret != -ENODATA)
5630 goto out;
5631 xs->not_found = ret;
5632
5633 /* Ok, we have a new bucket, let's try again */
5634 ret = ocfs2_xattr_set_entry_bucket(inode, xi, xs, ctxt);
5635 if (ret && (ret != -ENOSPC))
5636 mlog_errno(ret);
5637
5638 out:
5639 return ret;
5640 }
5641
5642 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
5643 struct ocfs2_xattr_bucket *bucket,
5644 void *para)
5645 {
5646 int ret = 0, ref_credits;
5647 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5648 u16 i;
5649 struct ocfs2_xattr_entry *xe;
5650 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5651 struct ocfs2_xattr_set_ctxt ctxt = {NULL, NULL,};
5652 int credits = ocfs2_remove_extent_credits(osb->sb) +
5653 ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5654 struct ocfs2_xattr_value_root *xv;
5655 struct ocfs2_rm_xattr_bucket_para *args =
5656 (struct ocfs2_rm_xattr_bucket_para *)para;
5657
5658 ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
5659
5660 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
5661 xe = &xh->xh_entries[i];
5662 if (ocfs2_xattr_is_local(xe))
5663 continue;
5664
5665 ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket,
5666 i, &xv, NULL);
5667
5668 ret = ocfs2_lock_xattr_remove_allocators(inode, xv,
5669 args->ref_ci,
5670 args->ref_root_bh,
5671 &ctxt.meta_ac,
5672 &ref_credits);
5673
5674 ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
5675 if (IS_ERR(ctxt.handle)) {
5676 ret = PTR_ERR(ctxt.handle);
5677 mlog_errno(ret);
5678 break;
5679 }
5680
5681 ret = ocfs2_xattr_bucket_value_truncate(inode, bucket,
5682 i, 0, &ctxt);
5683
5684 ocfs2_commit_trans(osb, ctxt.handle);
5685 if (ctxt.meta_ac) {
5686 ocfs2_free_alloc_context(ctxt.meta_ac);
5687 ctxt.meta_ac = NULL;
5688 }
5689 if (ret) {
5690 mlog_errno(ret);
5691 break;
5692 }
5693 }
5694
5695 if (ctxt.meta_ac)
5696 ocfs2_free_alloc_context(ctxt.meta_ac);
5697 ocfs2_schedule_truncate_log_flush(osb, 1);
5698 ocfs2_run_deallocs(osb, &ctxt.dealloc);
5699 return ret;
5700 }
5701
5702 /*
5703 * Whenever we modify a xattr value root in the bucket(e.g, CoW
5704 * or change the extent record flag), we need to recalculate
5705 * the metaecc for the whole bucket. So it is done here.
5706 *
5707 * Note:
5708 * We have to give the extra credits for the caller.
5709 */
5710 static int ocfs2_xattr_bucket_post_refcount(struct inode *inode,
5711 handle_t *handle,
5712 void *para)
5713 {
5714 int ret;
5715 struct ocfs2_xattr_bucket *bucket =
5716 (struct ocfs2_xattr_bucket *)para;
5717
5718 ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
5719 OCFS2_JOURNAL_ACCESS_WRITE);
5720 if (ret) {
5721 mlog_errno(ret);
5722 return ret;
5723 }
5724
5725 ocfs2_xattr_bucket_journal_dirty(handle, bucket);
5726
5727 return 0;
5728 }
5729
5730 /*
5731 * Special action we need if the xattr value is refcounted.
5732 *
5733 * 1. If the xattr is refcounted, lock the tree.
5734 * 2. CoW the xattr if we are setting the new value and the value
5735 * will be stored outside.
5736 * 3. In other case, decrease_refcount will work for us, so just
5737 * lock the refcount tree, calculate the meta and credits is OK.
5738 *
5739 * We have to do CoW before ocfs2_init_xattr_set_ctxt since
5740 * currently CoW is a completed transaction, while this function
5741 * will also lock the allocators and let us deadlock. So we will
5742 * CoW the whole xattr value.
5743 */
5744 static int ocfs2_prepare_refcount_xattr(struct inode *inode,
5745 struct ocfs2_dinode *di,
5746 struct ocfs2_xattr_info *xi,
5747 struct ocfs2_xattr_search *xis,
5748 struct ocfs2_xattr_search *xbs,
5749 struct ocfs2_refcount_tree **ref_tree,
5750 int *meta_add,
5751 int *credits)
5752 {
5753 int ret = 0;
5754 struct ocfs2_xattr_block *xb;
5755 struct ocfs2_xattr_entry *xe;
5756 char *base;
5757 u32 p_cluster, num_clusters;
5758 unsigned int ext_flags;
5759 int name_offset, name_len;
5760 struct ocfs2_xattr_value_buf vb;
5761 struct ocfs2_xattr_bucket *bucket = NULL;
5762 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5763 struct ocfs2_post_refcount refcount;
5764 struct ocfs2_post_refcount *p = NULL;
5765 struct buffer_head *ref_root_bh = NULL;
5766
5767 if (!xis->not_found) {
5768 xe = xis->here;
5769 name_offset = le16_to_cpu(xe->xe_name_offset);
5770 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5771 base = xis->base;
5772 vb.vb_bh = xis->inode_bh;
5773 vb.vb_access = ocfs2_journal_access_di;
5774 } else {
5775 int i, block_off = 0;
5776 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
5777 xe = xbs->here;
5778 name_offset = le16_to_cpu(xe->xe_name_offset);
5779 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5780 i = xbs->here - xbs->header->xh_entries;
5781
5782 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
5783 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
5784 bucket_xh(xbs->bucket),
5785 i, &block_off,
5786 &name_offset);
5787 if (ret) {
5788 mlog_errno(ret);
5789 goto out;
5790 }
5791 base = bucket_block(xbs->bucket, block_off);
5792 vb.vb_bh = xbs->bucket->bu_bhs[block_off];
5793 vb.vb_access = ocfs2_journal_access;
5794
5795 if (ocfs2_meta_ecc(osb)) {
5796 /*create parameters for ocfs2_post_refcount. */
5797 bucket = xbs->bucket;
5798 refcount.credits = bucket->bu_blocks;
5799 refcount.para = bucket;
5800 refcount.func =
5801 ocfs2_xattr_bucket_post_refcount;
5802 p = &refcount;
5803 }
5804 } else {
5805 base = xbs->base;
5806 vb.vb_bh = xbs->xattr_bh;
5807 vb.vb_access = ocfs2_journal_access_xb;
5808 }
5809 }
5810
5811 if (ocfs2_xattr_is_local(xe))
5812 goto out;
5813
5814 vb.vb_xv = (struct ocfs2_xattr_value_root *)
5815 (base + name_offset + name_len);
5816
5817 ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
5818 &num_clusters, &vb.vb_xv->xr_list,
5819 &ext_flags);
5820 if (ret) {
5821 mlog_errno(ret);
5822 goto out;
5823 }
5824
5825 /*
5826 * We just need to check the 1st extent record, since we always
5827 * CoW the whole xattr. So there shouldn't be a xattr with
5828 * some REFCOUNT extent recs after the 1st one.
5829 */
5830 if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
5831 goto out;
5832
5833 ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
5834 1, ref_tree, &ref_root_bh);
5835 if (ret) {
5836 mlog_errno(ret);
5837 goto out;
5838 }
5839
5840 /*
5841 * If we are deleting the xattr or the new size will be stored inside,
5842 * cool, leave it there, the xattr truncate process will remove them
5843 * for us(it still needs the refcount tree lock and the meta, credits).
5844 * And the worse case is that every cluster truncate will split the
5845 * refcount tree, and make the original extent become 3. So we will need
5846 * 2 * cluster more extent recs at most.
5847 */
5848 if (!xi->xi_value || xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE) {
5849
5850 ret = ocfs2_refcounted_xattr_delete_need(inode,
5851 &(*ref_tree)->rf_ci,
5852 ref_root_bh, vb.vb_xv,
5853 meta_add, credits);
5854 if (ret)
5855 mlog_errno(ret);
5856 goto out;
5857 }
5858
5859 ret = ocfs2_refcount_cow_xattr(inode, di, &vb,
5860 *ref_tree, ref_root_bh, 0,
5861 le32_to_cpu(vb.vb_xv->xr_clusters), p);
5862 if (ret)
5863 mlog_errno(ret);
5864
5865 out:
5866 brelse(ref_root_bh);
5867 return ret;
5868 }
5869
5870 /*
5871 * Add the REFCOUNTED flags for all the extent rec in ocfs2_xattr_value_root.
5872 * The physical clusters will be added to refcount tree.
5873 */
5874 static int ocfs2_xattr_value_attach_refcount(struct inode *inode,
5875 struct ocfs2_xattr_value_root *xv,
5876 struct ocfs2_extent_tree *value_et,
5877 struct ocfs2_caching_info *ref_ci,
5878 struct buffer_head *ref_root_bh,
5879 struct ocfs2_cached_dealloc_ctxt *dealloc,
5880 struct ocfs2_post_refcount *refcount)
5881 {
5882 int ret = 0;
5883 u32 clusters = le32_to_cpu(xv->xr_clusters);
5884 u32 cpos, p_cluster, num_clusters;
5885 struct ocfs2_extent_list *el = &xv->xr_list;
5886 unsigned int ext_flags;
5887
5888 cpos = 0;
5889 while (cpos < clusters) {
5890 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
5891 &num_clusters, el, &ext_flags);
5892
5893 cpos += num_clusters;
5894 if ((ext_flags & OCFS2_EXT_REFCOUNTED))
5895 continue;
5896
5897 BUG_ON(!p_cluster);
5898
5899 ret = ocfs2_add_refcount_flag(inode, value_et,
5900 ref_ci, ref_root_bh,
5901 cpos - num_clusters,
5902 p_cluster, num_clusters,
5903 dealloc, refcount);
5904 if (ret) {
5905 mlog_errno(ret);
5906 break;
5907 }
5908 }
5909
5910 return ret;
5911 }
5912
5913 /*
5914 * Given a normal ocfs2_xattr_header, refcount all the entries which
5915 * have value stored outside.
5916 * Used for xattrs stored in inode and ocfs2_xattr_block.
5917 */
5918 static int ocfs2_xattr_attach_refcount_normal(struct inode *inode,
5919 struct ocfs2_xattr_value_buf *vb,
5920 struct ocfs2_xattr_header *header,
5921 struct ocfs2_caching_info *ref_ci,
5922 struct buffer_head *ref_root_bh,
5923 struct ocfs2_cached_dealloc_ctxt *dealloc)
5924 {
5925
5926 struct ocfs2_xattr_entry *xe;
5927 struct ocfs2_xattr_value_root *xv;
5928 struct ocfs2_extent_tree et;
5929 int i, ret = 0;
5930
5931 for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
5932 xe = &header->xh_entries[i];
5933
5934 if (ocfs2_xattr_is_local(xe))
5935 continue;
5936
5937 xv = (struct ocfs2_xattr_value_root *)((void *)header +
5938 le16_to_cpu(xe->xe_name_offset) +
5939 OCFS2_XATTR_SIZE(xe->xe_name_len));
5940
5941 vb->vb_xv = xv;
5942 ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
5943
5944 ret = ocfs2_xattr_value_attach_refcount(inode, xv, &et,
5945 ref_ci, ref_root_bh,
5946 dealloc, NULL);
5947 if (ret) {
5948 mlog_errno(ret);
5949 break;
5950 }
5951 }
5952
5953 return ret;
5954 }
5955
5956 static int ocfs2_xattr_inline_attach_refcount(struct inode *inode,
5957 struct buffer_head *fe_bh,
5958 struct ocfs2_caching_info *ref_ci,
5959 struct buffer_head *ref_root_bh,
5960 struct ocfs2_cached_dealloc_ctxt *dealloc)
5961 {
5962 struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
5963 struct ocfs2_xattr_header *header = (struct ocfs2_xattr_header *)
5964 (fe_bh->b_data + inode->i_sb->s_blocksize -
5965 le16_to_cpu(di->i_xattr_inline_size));
5966 struct ocfs2_xattr_value_buf vb = {
5967 .vb_bh = fe_bh,
5968 .vb_access = ocfs2_journal_access_di,
5969 };
5970
5971 return ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
5972 ref_ci, ref_root_bh, dealloc);
5973 }
5974
5975 struct ocfs2_xattr_tree_value_refcount_para {
5976 struct ocfs2_caching_info *ref_ci;
5977 struct buffer_head *ref_root_bh;
5978 struct ocfs2_cached_dealloc_ctxt *dealloc;
5979 };
5980
5981 static int ocfs2_get_xattr_tree_value_root(struct super_block *sb,
5982 struct ocfs2_xattr_bucket *bucket,
5983 int offset,
5984 struct ocfs2_xattr_value_root **xv,
5985 struct buffer_head **bh)
5986 {
5987 int ret, block_off, name_offset;
5988 struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5989 struct ocfs2_xattr_entry *xe = &xh->xh_entries[offset];
5990 void *base;
5991
5992 ret = ocfs2_xattr_bucket_get_name_value(sb,
5993 bucket_xh(bucket),
5994 offset,
5995 &block_off,
5996 &name_offset);
5997 if (ret) {
5998 mlog_errno(ret);
5999 goto out;
6000 }
6001
6002 base = bucket_block(bucket, block_off);
6003
6004 *xv = (struct ocfs2_xattr_value_root *)(base + name_offset +
6005 OCFS2_XATTR_SIZE(xe->xe_name_len));
6006
6007 if (bh)
6008 *bh = bucket->bu_bhs[block_off];
6009 out:
6010 return ret;
6011 }
6012
6013 /*
6014 * For a given xattr bucket, refcount all the entries which
6015 * have value stored outside.
6016 */
6017 static int ocfs2_xattr_bucket_value_refcount(struct inode *inode,
6018 struct ocfs2_xattr_bucket *bucket,
6019 void *para)
6020 {
6021 int i, ret = 0;
6022 struct ocfs2_extent_tree et;
6023 struct ocfs2_xattr_tree_value_refcount_para *ref =
6024 (struct ocfs2_xattr_tree_value_refcount_para *)para;
6025 struct ocfs2_xattr_header *xh =
6026 (struct ocfs2_xattr_header *)bucket->bu_bhs[0]->b_data;
6027 struct ocfs2_xattr_entry *xe;
6028 struct ocfs2_xattr_value_buf vb = {
6029 .vb_access = ocfs2_journal_access,
6030 };
6031 struct ocfs2_post_refcount refcount = {
6032 .credits = bucket->bu_blocks,
6033 .para = bucket,
6034 .func = ocfs2_xattr_bucket_post_refcount,
6035 };
6036 struct ocfs2_post_refcount *p = NULL;
6037
6038 /* We only need post_refcount if we support metaecc. */
6039 if (ocfs2_meta_ecc(OCFS2_SB(inode->i_sb)))
6040 p = &refcount;
6041
6042 trace_ocfs2_xattr_bucket_value_refcount(
6043 (unsigned long long)bucket_blkno(bucket),
6044 le16_to_cpu(xh->xh_count));
6045 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
6046 xe = &xh->xh_entries[i];
6047
6048 if (ocfs2_xattr_is_local(xe))
6049 continue;
6050
6051 ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket, i,
6052 &vb.vb_xv, &vb.vb_bh);
6053 if (ret) {
6054 mlog_errno(ret);
6055 break;
6056 }
6057
6058 ocfs2_init_xattr_value_extent_tree(&et,
6059 INODE_CACHE(inode), &vb);
6060
6061 ret = ocfs2_xattr_value_attach_refcount(inode, vb.vb_xv,
6062 &et, ref->ref_ci,
6063 ref->ref_root_bh,
6064 ref->dealloc, p);
6065 if (ret) {
6066 mlog_errno(ret);
6067 break;
6068 }
6069 }
6070
6071 return ret;
6072
6073 }
6074
6075 static int ocfs2_refcount_xattr_tree_rec(struct inode *inode,
6076 struct buffer_head *root_bh,
6077 u64 blkno, u32 cpos, u32 len, void *para)
6078 {
6079 return ocfs2_iterate_xattr_buckets(inode, blkno, len,
6080 ocfs2_xattr_bucket_value_refcount,
6081 para);
6082 }
6083
6084 static int ocfs2_xattr_block_attach_refcount(struct inode *inode,
6085 struct buffer_head *blk_bh,
6086 struct ocfs2_caching_info *ref_ci,
6087 struct buffer_head *ref_root_bh,
6088 struct ocfs2_cached_dealloc_ctxt *dealloc)
6089 {
6090 int ret = 0;
6091 struct ocfs2_xattr_block *xb =
6092 (struct ocfs2_xattr_block *)blk_bh->b_data;
6093
6094 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
6095 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
6096 struct ocfs2_xattr_value_buf vb = {
6097 .vb_bh = blk_bh,
6098 .vb_access = ocfs2_journal_access_xb,
6099 };
6100
6101 ret = ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
6102 ref_ci, ref_root_bh,
6103 dealloc);
6104 } else {
6105 struct ocfs2_xattr_tree_value_refcount_para para = {
6106 .ref_ci = ref_ci,
6107 .ref_root_bh = ref_root_bh,
6108 .dealloc = dealloc,
6109 };
6110
6111 ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
6112 ocfs2_refcount_xattr_tree_rec,
6113 &para);
6114 }
6115
6116 return ret;
6117 }
6118
6119 int ocfs2_xattr_attach_refcount_tree(struct inode *inode,
6120 struct buffer_head *fe_bh,
6121 struct ocfs2_caching_info *ref_ci,
6122 struct buffer_head *ref_root_bh,
6123 struct ocfs2_cached_dealloc_ctxt *dealloc)
6124 {
6125 int ret = 0;
6126 struct ocfs2_inode_info *oi = OCFS2_I(inode);
6127 struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
6128 struct buffer_head *blk_bh = NULL;
6129
6130 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
6131 ret = ocfs2_xattr_inline_attach_refcount(inode, fe_bh,
6132 ref_ci, ref_root_bh,
6133 dealloc);
6134 if (ret) {
6135 mlog_errno(ret);
6136 goto out;
6137 }
6138 }
6139
6140 if (!di->i_xattr_loc)
6141 goto out;
6142
6143 ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
6144 &blk_bh);
6145 if (ret < 0) {
6146 mlog_errno(ret);
6147 goto out;
6148 }
6149
6150 ret = ocfs2_xattr_block_attach_refcount(inode, blk_bh, ref_ci,
6151 ref_root_bh, dealloc);
6152 if (ret)
6153 mlog_errno(ret);
6154
6155 brelse(blk_bh);
6156 out:
6157
6158 return ret;
6159 }
6160
6161 typedef int (should_xattr_reflinked)(struct ocfs2_xattr_entry *xe);
6162 /*
6163 * Store the information we need in xattr reflink.
6164 * old_bh and new_bh are inode bh for the old and new inode.
6165 */
6166 struct ocfs2_xattr_reflink {
6167 struct inode *old_inode;
6168 struct inode *new_inode;
6169 struct buffer_head *old_bh;
6170 struct buffer_head *new_bh;
6171 struct ocfs2_caching_info *ref_ci;
6172 struct buffer_head *ref_root_bh;
6173 struct ocfs2_cached_dealloc_ctxt *dealloc;
6174 should_xattr_reflinked *xattr_reflinked;
6175 };
6176
6177 /*
6178 * Given a xattr header and xe offset,
6179 * return the proper xv and the corresponding bh.
6180 * xattr in inode, block and xattr tree have different implementaions.
6181 */
6182 typedef int (get_xattr_value_root)(struct super_block *sb,
6183 struct buffer_head *bh,
6184 struct ocfs2_xattr_header *xh,
6185 int offset,
6186 struct ocfs2_xattr_value_root **xv,
6187 struct buffer_head **ret_bh,
6188 void *para);
6189
6190 /*
6191 * Calculate all the xattr value root metadata stored in this xattr header and
6192 * credits we need if we create them from the scratch.
6193 * We use get_xattr_value_root so that all types of xattr container can use it.
6194 */
6195 static int ocfs2_value_metas_in_xattr_header(struct super_block *sb,
6196 struct buffer_head *bh,
6197 struct ocfs2_xattr_header *xh,
6198 int *metas, int *credits,
6199 int *num_recs,
6200 get_xattr_value_root *func,
6201 void *para)
6202 {
6203 int i, ret = 0;
6204 struct ocfs2_xattr_value_root *xv;
6205 struct ocfs2_xattr_entry *xe;
6206
6207 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
6208 xe = &xh->xh_entries[i];
6209 if (ocfs2_xattr_is_local(xe))
6210 continue;
6211
6212 ret = func(sb, bh, xh, i, &xv, NULL, para);
6213 if (ret) {
6214 mlog_errno(ret);
6215 break;
6216 }
6217
6218 *metas += le16_to_cpu(xv->xr_list.l_tree_depth) *
6219 le16_to_cpu(xv->xr_list.l_next_free_rec);
6220
6221 *credits += ocfs2_calc_extend_credits(sb,
6222 &def_xv.xv.xr_list,
6223 le32_to_cpu(xv->xr_clusters));
6224
6225 /*
6226 * If the value is a tree with depth > 1, We don't go deep
6227 * to the extent block, so just calculate a maximum record num.
6228 */
6229 if (!xv->xr_list.l_tree_depth)
6230 *num_recs += le16_to_cpu(xv->xr_list.l_next_free_rec);
6231 else
6232 *num_recs += ocfs2_clusters_for_bytes(sb,
6233 XATTR_SIZE_MAX);
6234 }
6235
6236 return ret;
6237 }
6238
6239 /* Used by xattr inode and block to return the right xv and buffer_head. */
6240 static int ocfs2_get_xattr_value_root(struct super_block *sb,
6241 struct buffer_head *bh,
6242 struct ocfs2_xattr_header *xh,
6243 int offset,
6244 struct ocfs2_xattr_value_root **xv,
6245 struct buffer_head **ret_bh,
6246 void *para)
6247 {
6248 struct ocfs2_xattr_entry *xe = &xh->xh_entries[offset];
6249
6250 *xv = (struct ocfs2_xattr_value_root *)((void *)xh +
6251 le16_to_cpu(xe->xe_name_offset) +
6252 OCFS2_XATTR_SIZE(xe->xe_name_len));
6253
6254 if (ret_bh)
6255 *ret_bh = bh;
6256
6257 return 0;
6258 }
6259
6260 /*
6261 * Lock the meta_ac and caculate how much credits we need for reflink xattrs.
6262 * It is only used for inline xattr and xattr block.
6263 */
6264 static int ocfs2_reflink_lock_xattr_allocators(struct ocfs2_super *osb,
6265 struct ocfs2_xattr_header *xh,
6266 struct buffer_head *ref_root_bh,
6267 int *credits,
6268 struct ocfs2_alloc_context **meta_ac)
6269 {
6270 int ret, meta_add = 0, num_recs = 0;
6271 struct ocfs2_refcount_block *rb =
6272 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
6273
6274 *credits = 0;
6275
6276 ret = ocfs2_value_metas_in_xattr_header(osb->sb, NULL, xh,
6277 &meta_add, credits, &num_recs,
6278 ocfs2_get_xattr_value_root,
6279 NULL);
6280 if (ret) {
6281 mlog_errno(ret);
6282 goto out;
6283 }
6284
6285 /*
6286 * We need to add/modify num_recs in refcount tree, so just calculate
6287 * an approximate number we need for refcount tree change.
6288 * Sometimes we need to split the tree, and after split, half recs
6289 * will be moved to the new block, and a new block can only provide
6290 * half number of recs. So we multiple new blocks by 2.
6291 */
6292 num_recs = num_recs / ocfs2_refcount_recs_per_rb(osb->sb) * 2;
6293 meta_add += num_recs;
6294 *credits += num_recs + num_recs * OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
6295 if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
6296 *credits += le16_to_cpu(rb->rf_list.l_tree_depth) *
6297 le16_to_cpu(rb->rf_list.l_next_free_rec) + 1;
6298 else
6299 *credits += 1;
6300
6301 ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add, meta_ac);
6302 if (ret)
6303 mlog_errno(ret);
6304
6305 out:
6306 return ret;
6307 }
6308
6309 /*
6310 * Given a xattr header, reflink all the xattrs in this container.
6311 * It can be used for inode, block and bucket.
6312 *
6313 * NOTE:
6314 * Before we call this function, the caller has memcpy the xattr in
6315 * old_xh to the new_xh.
6316 *
6317 * If args.xattr_reflinked is set, call it to decide whether the xe should
6318 * be reflinked or not. If not, remove it from the new xattr header.
6319 */
6320 static int ocfs2_reflink_xattr_header(handle_t *handle,
6321 struct ocfs2_xattr_reflink *args,
6322 struct buffer_head *old_bh,
6323 struct ocfs2_xattr_header *xh,
6324 struct buffer_head *new_bh,
6325 struct ocfs2_xattr_header *new_xh,
6326 struct ocfs2_xattr_value_buf *vb,
6327 struct ocfs2_alloc_context *meta_ac,
6328 get_xattr_value_root *func,
6329 void *para)
6330 {
6331 int ret = 0, i, j;
6332 struct super_block *sb = args->old_inode->i_sb;
6333 struct buffer_head *value_bh;
6334 struct ocfs2_xattr_entry *xe, *last;
6335 struct ocfs2_xattr_value_root *xv, *new_xv;
6336 struct ocfs2_extent_tree data_et;
6337 u32 clusters, cpos, p_cluster, num_clusters;
6338 unsigned int ext_flags = 0;
6339
6340 trace_ocfs2_reflink_xattr_header((unsigned long long)old_bh->b_blocknr,
6341 le16_to_cpu(xh->xh_count));
6342
6343 last = &new_xh->xh_entries[le16_to_cpu(new_xh->xh_count)];
6344 for (i = 0, j = 0; i < le16_to_cpu(xh->xh_count); i++, j++) {
6345 xe = &xh->xh_entries[i];
6346
6347 if (args->xattr_reflinked && !args->xattr_reflinked(xe)) {
6348 xe = &new_xh->xh_entries[j];
6349
6350 le16_add_cpu(&new_xh->xh_count, -1);
6351 if (new_xh->xh_count) {
6352 memmove(xe, xe + 1,
6353 (void *)last - (void *)xe);
6354 memset(last, 0,
6355 sizeof(struct ocfs2_xattr_entry));
6356 }
6357
6358 /*
6359 * We don't want j to increase in the next round since
6360 * it is already moved ahead.
6361 */
6362 j--;
6363 continue;
6364 }
6365
6366 if (ocfs2_xattr_is_local(xe))
6367 continue;
6368
6369 ret = func(sb, old_bh, xh, i, &xv, NULL, para);
6370 if (ret) {
6371 mlog_errno(ret);
6372 break;
6373 }
6374
6375 ret = func(sb, new_bh, new_xh, j, &new_xv, &value_bh, para);
6376 if (ret) {
6377 mlog_errno(ret);
6378 break;
6379 }
6380
6381 /*
6382 * For the xattr which has l_tree_depth = 0, all the extent
6383 * recs have already be copied to the new xh with the
6384 * propriate OCFS2_EXT_REFCOUNTED flag we just need to
6385 * increase the refount count int the refcount tree.
6386 *
6387 * For the xattr which has l_tree_depth > 0, we need
6388 * to initialize it to the empty default value root,
6389 * and then insert the extents one by one.
6390 */
6391 if (xv->xr_list.l_tree_depth) {
6392 memcpy(new_xv, &def_xv, sizeof(def_xv));
6393 vb->vb_xv = new_xv;
6394 vb->vb_bh = value_bh;
6395 ocfs2_init_xattr_value_extent_tree(&data_et,
6396 INODE_CACHE(args->new_inode), vb);
6397 }
6398
6399 clusters = le32_to_cpu(xv->xr_clusters);
6400 cpos = 0;
6401 while (cpos < clusters) {
6402 ret = ocfs2_xattr_get_clusters(args->old_inode,
6403 cpos,
6404 &p_cluster,
6405 &num_clusters,
6406 &xv->xr_list,
6407 &ext_flags);
6408 if (ret) {
6409 mlog_errno(ret);
6410 goto out;
6411 }
6412
6413 BUG_ON(!p_cluster);
6414
6415 if (xv->xr_list.l_tree_depth) {
6416 ret = ocfs2_insert_extent(handle,
6417 &data_et, cpos,
6418 ocfs2_clusters_to_blocks(
6419 args->old_inode->i_sb,
6420 p_cluster),
6421 num_clusters, ext_flags,
6422 meta_ac);
6423 if (ret) {
6424 mlog_errno(ret);
6425 goto out;
6426 }
6427 }
6428
6429 ret = ocfs2_increase_refcount(handle, args->ref_ci,
6430 args->ref_root_bh,
6431 p_cluster, num_clusters,
6432 meta_ac, args->dealloc);
6433 if (ret) {
6434 mlog_errno(ret);
6435 goto out;
6436 }
6437
6438 cpos += num_clusters;
6439 }
6440 }
6441
6442 out:
6443 return ret;
6444 }
6445
6446 static int ocfs2_reflink_xattr_inline(struct ocfs2_xattr_reflink *args)
6447 {
6448 int ret = 0, credits = 0;
6449 handle_t *handle;
6450 struct ocfs2_super *osb = OCFS2_SB(args->old_inode->i_sb);
6451 struct ocfs2_dinode *di = (struct ocfs2_dinode *)args->old_bh->b_data;
6452 int inline_size = le16_to_cpu(di->i_xattr_inline_size);
6453 int header_off = osb->sb->s_blocksize - inline_size;
6454 struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)
6455 (args->old_bh->b_data + header_off);
6456 struct ocfs2_xattr_header *new_xh = (struct ocfs2_xattr_header *)
6457 (args->new_bh->b_data + header_off);
6458 struct ocfs2_alloc_context *meta_ac = NULL;
6459 struct ocfs2_inode_info *new_oi;
6460 struct ocfs2_dinode *new_di;
6461 struct ocfs2_xattr_value_buf vb = {
6462 .vb_bh = args->new_bh,
6463 .vb_access = ocfs2_journal_access_di,
6464 };
6465
6466 ret = ocfs2_reflink_lock_xattr_allocators(osb, xh, args->ref_root_bh,
6467 &credits, &meta_ac);
6468 if (ret) {
6469 mlog_errno(ret);
6470 goto out;
6471 }
6472
6473 handle = ocfs2_start_trans(osb, credits);
6474 if (IS_ERR(handle)) {
6475 ret = PTR_ERR(handle);
6476 mlog_errno(ret);
6477 goto out;
6478 }
6479
6480 ret = ocfs2_journal_access_di(handle, INODE_CACHE(args->new_inode),
6481 args->new_bh, OCFS2_JOURNAL_ACCESS_WRITE);
6482 if (ret) {
6483 mlog_errno(ret);
6484 goto out_commit;
6485 }
6486
6487 memcpy(args->new_bh->b_data + header_off,
6488 args->old_bh->b_data + header_off, inline_size);
6489
6490 new_di = (struct ocfs2_dinode *)args->new_bh->b_data;
6491 new_di->i_xattr_inline_size = cpu_to_le16(inline_size);
6492
6493 ret = ocfs2_reflink_xattr_header(handle, args, args->old_bh, xh,
6494 args->new_bh, new_xh, &vb, meta_ac,
6495 ocfs2_get_xattr_value_root, NULL);
6496 if (ret) {
6497 mlog_errno(ret);
6498 goto out_commit;
6499 }
6500
6501 new_oi = OCFS2_I(args->new_inode);
6502 spin_lock(&new_oi->ip_lock);
6503 new_oi->ip_dyn_features |= OCFS2_HAS_XATTR_FL | OCFS2_INLINE_XATTR_FL;
6504 new_di->i_dyn_features = cpu_to_le16(new_oi->ip_dyn_features);
6505 spin_unlock(&new_oi->ip_lock);
6506
6507 ocfs2_journal_dirty(handle, args->new_bh);
6508
6509 out_commit:
6510 ocfs2_commit_trans(osb, handle);
6511
6512 out:
6513 if (meta_ac)
6514 ocfs2_free_alloc_context(meta_ac);
6515 return ret;
6516 }
6517
6518 static int ocfs2_create_empty_xattr_block(struct inode *inode,
6519 struct buffer_head *fe_bh,
6520 struct buffer_head **ret_bh,
6521 int indexed)
6522 {
6523 int ret;
6524 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
6525 struct ocfs2_xattr_set_ctxt ctxt;
6526
6527 memset(&ctxt, 0, sizeof(ctxt));
6528 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &ctxt.meta_ac);
6529 if (ret < 0) {
6530 mlog_errno(ret);
6531 return ret;
6532 }
6533
6534 ctxt.handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_CREATE_CREDITS);
6535 if (IS_ERR(ctxt.handle)) {
6536 ret = PTR_ERR(ctxt.handle);
6537 mlog_errno(ret);
6538 goto out;
6539 }
6540
6541 trace_ocfs2_create_empty_xattr_block(
6542 (unsigned long long)fe_bh->b_blocknr, indexed);
6543 ret = ocfs2_create_xattr_block(inode, fe_bh, &ctxt, indexed,
6544 ret_bh);
6545 if (ret)
6546 mlog_errno(ret);
6547
6548 ocfs2_commit_trans(osb, ctxt.handle);
6549 out:
6550 ocfs2_free_alloc_context(ctxt.meta_ac);
6551 return ret;
6552 }
6553
6554 static int ocfs2_reflink_xattr_block(struct ocfs2_xattr_reflink *args,
6555 struct buffer_head *blk_bh,
6556 struct buffer_head *new_blk_bh)
6557 {
6558 int ret = 0, credits = 0;
6559 handle_t *handle;
6560 struct ocfs2_inode_info *new_oi = OCFS2_I(args->new_inode);
6561 struct ocfs2_dinode *new_di;
6562 struct ocfs2_super *osb = OCFS2_SB(args->new_inode->i_sb);
6563 int header_off = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
6564 struct ocfs2_xattr_block *xb =
6565 (struct ocfs2_xattr_block *)blk_bh->b_data;
6566 struct ocfs2_xattr_header *xh = &xb->xb_attrs.xb_header;
6567 struct ocfs2_xattr_block *new_xb =
6568 (struct ocfs2_xattr_block *)new_blk_bh->b_data;
6569 struct ocfs2_xattr_header *new_xh = &new_xb->xb_attrs.xb_header;
6570 struct ocfs2_alloc_context *meta_ac;
6571 struct ocfs2_xattr_value_buf vb = {
6572 .vb_bh = new_blk_bh,
6573 .vb_access = ocfs2_journal_access_xb,
6574 };
6575
6576 ret = ocfs2_reflink_lock_xattr_allocators(osb, xh, args->ref_root_bh,
6577 &credits, &meta_ac);
6578 if (ret) {
6579 mlog_errno(ret);
6580 return ret;
6581 }
6582
6583 /* One more credits in case we need to add xattr flags in new inode. */
6584 handle = ocfs2_start_trans(osb, credits + 1);
6585 if (IS_ERR(handle)) {
6586 ret = PTR_ERR(handle);
6587 mlog_errno(ret);
6588 goto out;
6589 }
6590
6591 if (!(new_oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) {
6592 ret = ocfs2_journal_access_di(handle,
6593 INODE_CACHE(args->new_inode),
6594 args->new_bh,
6595 OCFS2_JOURNAL_ACCESS_WRITE);
6596 if (ret) {
6597 mlog_errno(ret);
6598 goto out_commit;
6599 }
6600 }
6601
6602 ret = ocfs2_journal_access_xb(handle, INODE_CACHE(args->new_inode),
6603 new_blk_bh, OCFS2_JOURNAL_ACCESS_WRITE);
6604 if (ret) {
6605 mlog_errno(ret);
6606 goto out_commit;
6607 }
6608
6609 memcpy(new_blk_bh->b_data + header_off, blk_bh->b_data + header_off,
6610 osb->sb->s_blocksize - header_off);
6611
6612 ret = ocfs2_reflink_xattr_header(handle, args, blk_bh, xh,
6613 new_blk_bh, new_xh, &vb, meta_ac,
6614 ocfs2_get_xattr_value_root, NULL);
6615 if (ret) {
6616 mlog_errno(ret);
6617 goto out_commit;
6618 }
6619
6620 ocfs2_journal_dirty(handle, new_blk_bh);
6621
6622 if (!(new_oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) {
6623 new_di = (struct ocfs2_dinode *)args->new_bh->b_data;
6624 spin_lock(&new_oi->ip_lock);
6625 new_oi->ip_dyn_features |= OCFS2_HAS_XATTR_FL;
6626 new_di->i_dyn_features = cpu_to_le16(new_oi->ip_dyn_features);
6627 spin_unlock(&new_oi->ip_lock);
6628
6629 ocfs2_journal_dirty(handle, args->new_bh);
6630 }
6631
6632 out_commit:
6633 ocfs2_commit_trans(osb, handle);
6634
6635 out:
6636 ocfs2_free_alloc_context(meta_ac);
6637 return ret;
6638 }
6639
6640 struct ocfs2_reflink_xattr_tree_args {
6641 struct ocfs2_xattr_reflink *reflink;
6642 struct buffer_head *old_blk_bh;
6643 struct buffer_head *new_blk_bh;
6644 struct ocfs2_xattr_bucket *old_bucket;
6645 struct ocfs2_xattr_bucket *new_bucket;
6646 };
6647
6648 /*
6649 * NOTE:
6650 * We have to handle the case that both old bucket and new bucket
6651 * will call this function to get the right ret_bh.
6652 * So The caller must give us the right bh.
6653 */
6654 static int ocfs2_get_reflink_xattr_value_root(struct super_block *sb,
6655 struct buffer_head *bh,
6656 struct ocfs2_xattr_header *xh,
6657 int offset,
6658 struct ocfs2_xattr_value_root **xv,
6659 struct buffer_head **ret_bh,
6660 void *para)
6661 {
6662 struct ocfs2_reflink_xattr_tree_args *args =
6663 (struct ocfs2_reflink_xattr_tree_args *)para;
6664 struct ocfs2_xattr_bucket *bucket;
6665
6666 if (bh == args->old_bucket->bu_bhs[0])
6667 bucket = args->old_bucket;
6668 else
6669 bucket = args->new_bucket;
6670
6671 return ocfs2_get_xattr_tree_value_root(sb, bucket, offset,
6672 xv, ret_bh);
6673 }
6674
6675 struct ocfs2_value_tree_metas {
6676 int num_metas;
6677 int credits;
6678 int num_recs;
6679 };
6680
6681 static int ocfs2_value_tree_metas_in_bucket(struct super_block *sb,
6682 struct buffer_head *bh,
6683 struct ocfs2_xattr_header *xh,
6684 int offset,
6685 struct ocfs2_xattr_value_root **xv,
6686 struct buffer_head **ret_bh,
6687 void *para)
6688 {
6689 struct ocfs2_xattr_bucket *bucket =
6690 (struct ocfs2_xattr_bucket *)para;
6691
6692 return ocfs2_get_xattr_tree_value_root(sb, bucket, offset,
6693 xv, ret_bh);
6694 }
6695
6696 static int ocfs2_calc_value_tree_metas(struct inode *inode,
6697 struct ocfs2_xattr_bucket *bucket,
6698 void *para)
6699 {
6700 struct ocfs2_value_tree_metas *metas =
6701 (struct ocfs2_value_tree_metas *)para;
6702 struct ocfs2_xattr_header *xh =
6703 (struct ocfs2_xattr_header *)bucket->bu_bhs[0]->b_data;
6704
6705 /* Add the credits for this bucket first. */
6706 metas->credits += bucket->bu_blocks;
6707 return ocfs2_value_metas_in_xattr_header(inode->i_sb, bucket->bu_bhs[0],
6708 xh, &metas->num_metas,
6709 &metas->credits, &metas->num_recs,
6710 ocfs2_value_tree_metas_in_bucket,
6711 bucket);
6712 }
6713
6714 /*
6715 * Given a xattr extent rec starting from blkno and having len clusters,
6716 * iterate all the buckets calculate how much metadata we need for reflinking
6717 * all the ocfs2_xattr_value_root and lock the allocators accordingly.
6718 */
6719 static int ocfs2_lock_reflink_xattr_rec_allocators(
6720 struct ocfs2_reflink_xattr_tree_args *args,
6721 struct ocfs2_extent_tree *xt_et,
6722 u64 blkno, u32 len, int *credits,
6723 struct ocfs2_alloc_context **meta_ac,
6724 struct ocfs2_alloc_context **data_ac)
6725 {
6726 int ret, num_free_extents;
6727 struct ocfs2_value_tree_metas metas;
6728 struct ocfs2_super *osb = OCFS2_SB(args->reflink->old_inode->i_sb);
6729 struct ocfs2_refcount_block *rb;
6730
6731 memset(&metas, 0, sizeof(metas));
6732
6733 ret = ocfs2_iterate_xattr_buckets(args->reflink->old_inode, blkno, len,
6734 ocfs2_calc_value_tree_metas, &metas);
6735 if (ret) {
6736 mlog_errno(ret);
6737 goto out;
6738 }
6739
6740 *credits = metas.credits;
6741
6742 /*
6743 * Calculate we need for refcount tree change.
6744 *
6745 * We need to add/modify num_recs in refcount tree, so just calculate
6746 * an approximate number we need for refcount tree change.
6747 * Sometimes we need to split the tree, and after split, half recs
6748 * will be moved to the new block, and a new block can only provide
6749 * half number of recs. So we multiple new blocks by 2.
6750 * In the end, we have to add credits for modifying the already
6751 * existed refcount block.
6752 */
6753 rb = (struct ocfs2_refcount_block *)args->reflink->ref_root_bh->b_data;
6754 metas.num_recs =
6755 (metas.num_recs + ocfs2_refcount_recs_per_rb(osb->sb) - 1) /
6756 ocfs2_refcount_recs_per_rb(osb->sb) * 2;
6757 metas.num_metas += metas.num_recs;
6758 *credits += metas.num_recs +
6759 metas.num_recs * OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
6760 if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
6761 *credits += le16_to_cpu(rb->rf_list.l_tree_depth) *
6762 le16_to_cpu(rb->rf_list.l_next_free_rec) + 1;
6763 else
6764 *credits += 1;
6765
6766 /* count in the xattr tree change. */
6767 num_free_extents = ocfs2_num_free_extents(osb, xt_et);
6768 if (num_free_extents < 0) {
6769 ret = num_free_extents;
6770 mlog_errno(ret);
6771 goto out;
6772 }
6773
6774 if (num_free_extents < len)
6775 metas.num_metas += ocfs2_extend_meta_needed(xt_et->et_root_el);
6776
6777 *credits += ocfs2_calc_extend_credits(osb->sb,
6778 xt_et->et_root_el, len);
6779
6780 if (metas.num_metas) {
6781 ret = ocfs2_reserve_new_metadata_blocks(osb, metas.num_metas,
6782 meta_ac);
6783 if (ret) {
6784 mlog_errno(ret);
6785 goto out;
6786 }
6787 }
6788
6789 if (len) {
6790 ret = ocfs2_reserve_clusters(osb, len, data_ac);
6791 if (ret)
6792 mlog_errno(ret);
6793 }
6794 out:
6795 if (ret) {
6796 if (*meta_ac) {
6797 ocfs2_free_alloc_context(*meta_ac);
6798 meta_ac = NULL;
6799 }
6800 }
6801
6802 return ret;
6803 }
6804
6805 static int ocfs2_reflink_xattr_bucket(handle_t *handle,
6806 u64 blkno, u64 new_blkno, u32 clusters,
6807 u32 *cpos, int num_buckets,
6808 struct ocfs2_alloc_context *meta_ac,
6809 struct ocfs2_alloc_context *data_ac,
6810 struct ocfs2_reflink_xattr_tree_args *args)
6811 {
6812 int i, j, ret = 0;
6813 struct super_block *sb = args->reflink->old_inode->i_sb;
6814 int bpb = args->old_bucket->bu_blocks;
6815 struct ocfs2_xattr_value_buf vb = {
6816 .vb_access = ocfs2_journal_access,
6817 };
6818
6819 for (i = 0; i < num_buckets; i++, blkno += bpb, new_blkno += bpb) {
6820 ret = ocfs2_read_xattr_bucket(args->old_bucket, blkno);
6821 if (ret) {
6822 mlog_errno(ret);
6823 break;
6824 }
6825
6826 ret = ocfs2_init_xattr_bucket(args->new_bucket, new_blkno);
6827 if (ret) {
6828 mlog_errno(ret);
6829 break;
6830 }
6831
6832 ret = ocfs2_xattr_bucket_journal_access(handle,
6833 args->new_bucket,
6834 OCFS2_JOURNAL_ACCESS_CREATE);
6835 if (ret) {
6836 mlog_errno(ret);
6837 break;
6838 }
6839
6840 for (j = 0; j < bpb; j++)
6841 memcpy(bucket_block(args->new_bucket, j),
6842 bucket_block(args->old_bucket, j),
6843 sb->s_blocksize);
6844
6845 /*
6846 * Record the start cpos so that we can use it to initialize
6847 * our xattr tree we also set the xh_num_bucket for the new
6848 * bucket.
6849 */
6850 if (i == 0) {
6851 *cpos = le32_to_cpu(bucket_xh(args->new_bucket)->
6852 xh_entries[0].xe_name_hash);
6853 bucket_xh(args->new_bucket)->xh_num_buckets =
6854 cpu_to_le16(num_buckets);
6855 }
6856
6857 ocfs2_xattr_bucket_journal_dirty(handle, args->new_bucket);
6858
6859 ret = ocfs2_reflink_xattr_header(handle, args->reflink,
6860 args->old_bucket->bu_bhs[0],
6861 bucket_xh(args->old_bucket),
6862 args->new_bucket->bu_bhs[0],
6863 bucket_xh(args->new_bucket),
6864 &vb, meta_ac,
6865 ocfs2_get_reflink_xattr_value_root,
6866 args);
6867 if (ret) {
6868 mlog_errno(ret);
6869 break;
6870 }
6871
6872 /*
6873 * Re-access and dirty the bucket to calculate metaecc.
6874 * Because we may extend the transaction in reflink_xattr_header
6875 * which will let the already accessed block gone.
6876 */
6877 ret = ocfs2_xattr_bucket_journal_access(handle,
6878 args->new_bucket,
6879 OCFS2_JOURNAL_ACCESS_WRITE);
6880 if (ret) {
6881 mlog_errno(ret);
6882 break;
6883 }
6884
6885 ocfs2_xattr_bucket_journal_dirty(handle, args->new_bucket);
6886
6887 ocfs2_xattr_bucket_relse(args->old_bucket);
6888 ocfs2_xattr_bucket_relse(args->new_bucket);
6889 }
6890
6891 ocfs2_xattr_bucket_relse(args->old_bucket);
6892 ocfs2_xattr_bucket_relse(args->new_bucket);
6893 return ret;
6894 }
6895
6896 static int ocfs2_reflink_xattr_buckets(handle_t *handle,
6897 struct inode *inode,
6898 struct ocfs2_reflink_xattr_tree_args *args,
6899 struct ocfs2_extent_tree *et,
6900 struct ocfs2_alloc_context *meta_ac,
6901 struct ocfs2_alloc_context *data_ac,
6902 u64 blkno, u32 cpos, u32 len)
6903 {
6904 int ret, first_inserted = 0;
6905 u32 p_cluster, num_clusters, reflink_cpos = 0;
6906 u64 new_blkno;
6907 unsigned int num_buckets, reflink_buckets;
6908 unsigned int bpc =
6909 ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
6910
6911 ret = ocfs2_read_xattr_bucket(args->old_bucket, blkno);
6912 if (ret) {
6913 mlog_errno(ret);
6914 goto out;
6915 }
6916 num_buckets = le16_to_cpu(bucket_xh(args->old_bucket)->xh_num_buckets);
6917 ocfs2_xattr_bucket_relse(args->old_bucket);
6918
6919 while (len && num_buckets) {
6920 ret = ocfs2_claim_clusters(handle, data_ac,
6921 1, &p_cluster, &num_clusters);
6922 if (ret) {
6923 mlog_errno(ret);
6924 goto out;
6925 }
6926
6927 new_blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
6928 reflink_buckets = min(num_buckets, bpc * num_clusters);
6929
6930 ret = ocfs2_reflink_xattr_bucket(handle, blkno,
6931 new_blkno, num_clusters,
6932 &reflink_cpos, reflink_buckets,
6933 meta_ac, data_ac, args);
6934 if (ret) {
6935 mlog_errno(ret);
6936 goto out;
6937 }
6938
6939 /*
6940 * For the 1st allocated cluster, we make it use the same cpos
6941 * so that the xattr tree looks the same as the original one
6942 * in the most case.
6943 */
6944 if (!first_inserted) {
6945 reflink_cpos = cpos;
6946 first_inserted = 1;
6947 }
6948 ret = ocfs2_insert_extent(handle, et, reflink_cpos, new_blkno,
6949 num_clusters, 0, meta_ac);
6950 if (ret)
6951 mlog_errno(ret);
6952
6953 trace_ocfs2_reflink_xattr_buckets((unsigned long long)new_blkno,
6954 num_clusters, reflink_cpos);
6955
6956 len -= num_clusters;
6957 blkno += ocfs2_clusters_to_blocks(inode->i_sb, num_clusters);
6958 num_buckets -= reflink_buckets;
6959 }
6960 out:
6961 return ret;
6962 }
6963
6964 /*
6965 * Create the same xattr extent record in the new inode's xattr tree.
6966 */
6967 static int ocfs2_reflink_xattr_rec(struct inode *inode,
6968 struct buffer_head *root_bh,
6969 u64 blkno,
6970 u32 cpos,
6971 u32 len,
6972 void *para)
6973 {
6974 int ret, credits = 0;
6975 handle_t *handle;
6976 struct ocfs2_reflink_xattr_tree_args *args =
6977 (struct ocfs2_reflink_xattr_tree_args *)para;
6978 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
6979 struct ocfs2_alloc_context *meta_ac = NULL;
6980 struct ocfs2_alloc_context *data_ac = NULL;
6981 struct ocfs2_extent_tree et;
6982
6983 trace_ocfs2_reflink_xattr_rec((unsigned long long)blkno, len);
6984
6985 ocfs2_init_xattr_tree_extent_tree(&et,
6986 INODE_CACHE(args->reflink->new_inode),
6987 args->new_blk_bh);
6988
6989 ret = ocfs2_lock_reflink_xattr_rec_allocators(args, &et, blkno,
6990 len, &credits,
6991 &meta_ac, &data_ac);
6992 if (ret) {
6993 mlog_errno(ret);
6994 goto out;
6995 }
6996
6997 handle = ocfs2_start_trans(osb, credits);
6998 if (IS_ERR(handle)) {
6999 ret = PTR_ERR(handle);
7000 mlog_errno(ret);
7001 goto out;
7002 }
7003
7004 ret = ocfs2_reflink_xattr_buckets(handle, inode, args, &et,
7005 meta_ac, data_ac,
7006 blkno, cpos, len);
7007 if (ret)
7008 mlog_errno(ret);
7009
7010 ocfs2_commit_trans(osb, handle);
7011
7012 out:
7013 if (meta_ac)
7014 ocfs2_free_alloc_context(meta_ac);
7015 if (data_ac)
7016 ocfs2_free_alloc_context(data_ac);
7017 return ret;
7018 }
7019
7020 /*
7021 * Create reflinked xattr buckets.
7022 * We will add bucket one by one, and refcount all the xattrs in the bucket
7023 * if they are stored outside.
7024 */
7025 static int ocfs2_reflink_xattr_tree(struct ocfs2_xattr_reflink *args,
7026 struct buffer_head *blk_bh,
7027 struct buffer_head *new_blk_bh)
7028 {
7029 int ret;
7030 struct ocfs2_reflink_xattr_tree_args para;
7031
7032 memset(&para, 0, sizeof(para));
7033 para.reflink = args;
7034 para.old_blk_bh = blk_bh;
7035 para.new_blk_bh = new_blk_bh;
7036
7037 para.old_bucket = ocfs2_xattr_bucket_new(args->old_inode);
7038 if (!para.old_bucket) {
7039 mlog_errno(-ENOMEM);
7040 return -ENOMEM;
7041 }
7042
7043 para.new_bucket = ocfs2_xattr_bucket_new(args->new_inode);
7044 if (!para.new_bucket) {
7045 ret = -ENOMEM;
7046 mlog_errno(ret);
7047 goto out;
7048 }
7049
7050 ret = ocfs2_iterate_xattr_index_block(args->old_inode, blk_bh,
7051 ocfs2_reflink_xattr_rec,
7052 &para);
7053 if (ret)
7054 mlog_errno(ret);
7055
7056 out:
7057 ocfs2_xattr_bucket_free(para.old_bucket);
7058 ocfs2_xattr_bucket_free(para.new_bucket);
7059 return ret;
7060 }
7061
7062 static int ocfs2_reflink_xattr_in_block(struct ocfs2_xattr_reflink *args,
7063 struct buffer_head *blk_bh)
7064 {
7065 int ret, indexed = 0;
7066 struct buffer_head *new_blk_bh = NULL;
7067 struct ocfs2_xattr_block *xb =
7068 (struct ocfs2_xattr_block *)blk_bh->b_data;
7069
7070
7071 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)
7072 indexed = 1;
7073
7074 ret = ocfs2_create_empty_xattr_block(args->new_inode, args->new_bh,
7075 &new_blk_bh, indexed);
7076 if (ret) {
7077 mlog_errno(ret);
7078 goto out;
7079 }
7080
7081 if (!indexed)
7082 ret = ocfs2_reflink_xattr_block(args, blk_bh, new_blk_bh);
7083 else
7084 ret = ocfs2_reflink_xattr_tree(args, blk_bh, new_blk_bh);
7085 if (ret)
7086 mlog_errno(ret);
7087
7088 out:
7089 brelse(new_blk_bh);
7090 return ret;
7091 }
7092
7093 static int ocfs2_reflink_xattr_no_security(struct ocfs2_xattr_entry *xe)
7094 {
7095 int type = ocfs2_xattr_get_type(xe);
7096
7097 return type != OCFS2_XATTR_INDEX_SECURITY &&
7098 type != OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS &&
7099 type != OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
7100 }
7101
7102 int ocfs2_reflink_xattrs(struct inode *old_inode,
7103 struct buffer_head *old_bh,
7104 struct inode *new_inode,
7105 struct buffer_head *new_bh,
7106 bool preserve_security)
7107 {
7108 int ret;
7109 struct ocfs2_xattr_reflink args;
7110 struct ocfs2_inode_info *oi = OCFS2_I(old_inode);
7111 struct ocfs2_dinode *di = (struct ocfs2_dinode *)old_bh->b_data;
7112 struct buffer_head *blk_bh = NULL;
7113 struct ocfs2_cached_dealloc_ctxt dealloc;
7114 struct ocfs2_refcount_tree *ref_tree;
7115 struct buffer_head *ref_root_bh = NULL;
7116
7117 ret = ocfs2_lock_refcount_tree(OCFS2_SB(old_inode->i_sb),
7118 le64_to_cpu(di->i_refcount_loc),
7119 1, &ref_tree, &ref_root_bh);
7120 if (ret) {
7121 mlog_errno(ret);
7122 goto out;
7123 }
7124
7125 ocfs2_init_dealloc_ctxt(&dealloc);
7126
7127 args.old_inode = old_inode;
7128 args.new_inode = new_inode;
7129 args.old_bh = old_bh;
7130 args.new_bh = new_bh;
7131 args.ref_ci = &ref_tree->rf_ci;
7132 args.ref_root_bh = ref_root_bh;
7133 args.dealloc = &dealloc;
7134 if (preserve_security)
7135 args.xattr_reflinked = NULL;
7136 else
7137 args.xattr_reflinked = ocfs2_reflink_xattr_no_security;
7138
7139 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
7140 ret = ocfs2_reflink_xattr_inline(&args);
7141 if (ret) {
7142 mlog_errno(ret);
7143 goto out_unlock;
7144 }
7145 }
7146
7147 if (!di->i_xattr_loc)
7148 goto out_unlock;
7149
7150 ret = ocfs2_read_xattr_block(old_inode, le64_to_cpu(di->i_xattr_loc),
7151 &blk_bh);
7152 if (ret < 0) {
7153 mlog_errno(ret);
7154 goto out_unlock;
7155 }
7156
7157 ret = ocfs2_reflink_xattr_in_block(&args, blk_bh);
7158 if (ret)
7159 mlog_errno(ret);
7160
7161 brelse(blk_bh);
7162
7163 out_unlock:
7164 ocfs2_unlock_refcount_tree(OCFS2_SB(old_inode->i_sb),
7165 ref_tree, 1);
7166 brelse(ref_root_bh);
7167
7168 if (ocfs2_dealloc_has_cluster(&dealloc)) {
7169 ocfs2_schedule_truncate_log_flush(OCFS2_SB(old_inode->i_sb), 1);
7170 ocfs2_run_deallocs(OCFS2_SB(old_inode->i_sb), &dealloc);
7171 }
7172
7173 out:
7174 return ret;
7175 }
7176
7177 /*
7178 * Initialize security and acl for a already created inode.
7179 * Used for reflink a non-preserve-security file.
7180 *
7181 * It uses common api like ocfs2_xattr_set, so the caller
7182 * must not hold any lock expect i_mutex.
7183 */
7184 int ocfs2_init_security_and_acl(struct inode *dir,
7185 struct inode *inode,
7186 const struct qstr *qstr)
7187 {
7188 int ret = 0;
7189 struct buffer_head *dir_bh = NULL;
7190
7191 ret = ocfs2_init_security_get(inode, dir, qstr, NULL);
7192 if (!ret) {
7193 mlog_errno(ret);
7194 goto leave;
7195 }
7196
7197 ret = ocfs2_inode_lock(dir, &dir_bh, 0);
7198 if (ret) {
7199 mlog_errno(ret);
7200 goto leave;
7201 }
7202
7203 ret = ocfs2_init_acl(NULL, inode, dir, NULL, dir_bh, NULL, NULL);
7204 if (ret)
7205 mlog_errno(ret);
7206
7207 ocfs2_inode_unlock(dir, 0);
7208 brelse(dir_bh);
7209 leave:
7210 return ret;
7211 }
7212 /*
7213 * 'security' attributes support
7214 */
7215 static size_t ocfs2_xattr_security_list(struct dentry *dentry, char *list,
7216 size_t list_size, const char *name,
7217 size_t name_len, int type)
7218 {
7219 const size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
7220 const size_t total_len = prefix_len + name_len + 1;
7221
7222 if (list && total_len <= list_size) {
7223 memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
7224 memcpy(list + prefix_len, name, name_len);
7225 list[prefix_len + name_len] = '\0';
7226 }
7227 return total_len;
7228 }
7229
7230 static int ocfs2_xattr_security_get(struct dentry *dentry, const char *name,
7231 void *buffer, size_t size, int type)
7232 {
7233 if (strcmp(name, "") == 0)
7234 return -EINVAL;
7235 return ocfs2_xattr_get(dentry->d_inode, OCFS2_XATTR_INDEX_SECURITY,
7236 name, buffer, size);
7237 }
7238
7239 static int ocfs2_xattr_security_set(struct dentry *dentry, const char *name,
7240 const void *value, size_t size, int flags, int type)
7241 {
7242 if (strcmp(name, "") == 0)
7243 return -EINVAL;
7244
7245 return ocfs2_xattr_set(dentry->d_inode, OCFS2_XATTR_INDEX_SECURITY,
7246 name, value, size, flags);
7247 }
7248
7249 int ocfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
7250 void *fs_info)
7251 {
7252 const struct xattr *xattr;
7253 int err = 0;
7254
7255 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
7256 err = ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_SECURITY,
7257 xattr->name, xattr->value,
7258 xattr->value_len, XATTR_CREATE);
7259 if (err)
7260 break;
7261 }
7262 return err;
7263 }
7264
7265 int ocfs2_init_security_get(struct inode *inode,
7266 struct inode *dir,
7267 const struct qstr *qstr,
7268 struct ocfs2_security_xattr_info *si)
7269 {
7270 /* check whether ocfs2 support feature xattr */
7271 if (!ocfs2_supports_xattr(OCFS2_SB(dir->i_sb)))
7272 return -EOPNOTSUPP;
7273 if (si)
7274 return security_old_inode_init_security(inode, dir, qstr,
7275 &si->name, &si->value,
7276 &si->value_len);
7277
7278 return security_inode_init_security(inode, dir, qstr,
7279 &ocfs2_initxattrs, NULL);
7280 }
7281
7282 int ocfs2_init_security_set(handle_t *handle,
7283 struct inode *inode,
7284 struct buffer_head *di_bh,
7285 struct ocfs2_security_xattr_info *si,
7286 struct ocfs2_alloc_context *xattr_ac,
7287 struct ocfs2_alloc_context *data_ac)
7288 {
7289 return ocfs2_xattr_set_handle(handle, inode, di_bh,
7290 OCFS2_XATTR_INDEX_SECURITY,
7291 si->name, si->value, si->value_len, 0,
7292 xattr_ac, data_ac);
7293 }
7294
7295 const struct xattr_handler ocfs2_xattr_security_handler = {
7296 .prefix = XATTR_SECURITY_PREFIX,
7297 .list = ocfs2_xattr_security_list,
7298 .get = ocfs2_xattr_security_get,
7299 .set = ocfs2_xattr_security_set,
7300 };
7301
7302 /*
7303 * 'trusted' attributes support
7304 */
7305 static size_t ocfs2_xattr_trusted_list(struct dentry *dentry, char *list,
7306 size_t list_size, const char *name,
7307 size_t name_len, int type)
7308 {
7309 const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
7310 const size_t total_len = prefix_len + name_len + 1;
7311
7312 if (list && total_len <= list_size) {
7313 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
7314 memcpy(list + prefix_len, name, name_len);
7315 list[prefix_len + name_len] = '\0';
7316 }
7317 return total_len;
7318 }
7319
7320 static int ocfs2_xattr_trusted_get(struct dentry *dentry, const char *name,
7321 void *buffer, size_t size, int type)
7322 {
7323 if (strcmp(name, "") == 0)
7324 return -EINVAL;
7325 return ocfs2_xattr_get(dentry->d_inode, OCFS2_XATTR_INDEX_TRUSTED,
7326 name, buffer, size);
7327 }
7328
7329 static int ocfs2_xattr_trusted_set(struct dentry *dentry, const char *name,
7330 const void *value, size_t size, int flags, int type)
7331 {
7332 if (strcmp(name, "") == 0)
7333 return -EINVAL;
7334
7335 return ocfs2_xattr_set(dentry->d_inode, OCFS2_XATTR_INDEX_TRUSTED,
7336 name, value, size, flags);
7337 }
7338
7339 const struct xattr_handler ocfs2_xattr_trusted_handler = {
7340 .prefix = XATTR_TRUSTED_PREFIX,
7341 .list = ocfs2_xattr_trusted_list,
7342 .get = ocfs2_xattr_trusted_get,
7343 .set = ocfs2_xattr_trusted_set,
7344 };
7345
7346 /*
7347 * 'user' attributes support
7348 */
7349 static size_t ocfs2_xattr_user_list(struct dentry *dentry, char *list,
7350 size_t list_size, const char *name,
7351 size_t name_len, int type)
7352 {
7353 const size_t prefix_len = XATTR_USER_PREFIX_LEN;
7354 const size_t total_len = prefix_len + name_len + 1;
7355 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7356
7357 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7358 return 0;
7359
7360 if (list && total_len <= list_size) {
7361 memcpy(list, XATTR_USER_PREFIX, prefix_len);
7362 memcpy(list + prefix_len, name, name_len);
7363 list[prefix_len + name_len] = '\0';
7364 }
7365 return total_len;
7366 }
7367
7368 static int ocfs2_xattr_user_get(struct dentry *dentry, const char *name,
7369 void *buffer, size_t size, int type)
7370 {
7371 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7372
7373 if (strcmp(name, "") == 0)
7374 return -EINVAL;
7375 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7376 return -EOPNOTSUPP;
7377 return ocfs2_xattr_get(dentry->d_inode, OCFS2_XATTR_INDEX_USER, name,
7378 buffer, size);
7379 }
7380
7381 static int ocfs2_xattr_user_set(struct dentry *dentry, const char *name,
7382 const void *value, size_t size, int flags, int type)
7383 {
7384 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7385
7386 if (strcmp(name, "") == 0)
7387 return -EINVAL;
7388 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7389 return -EOPNOTSUPP;
7390
7391 return ocfs2_xattr_set(dentry->d_inode, OCFS2_XATTR_INDEX_USER,
7392 name, value, size, flags);
7393 }
7394
7395 const struct xattr_handler ocfs2_xattr_user_handler = {
7396 .prefix = XATTR_USER_PREFIX,
7397 .list = ocfs2_xattr_user_list,
7398 .get = ocfs2_xattr_user_get,
7399 .set = ocfs2_xattr_user_set,
7400 };