d8507972ee135f95a4ff9bcc696cc456c2977ee5
[muen/linux.git] / fs / ocfs2 / xattr.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /* -*- mode: c; c-basic-offset: 8; -*-
3  * vim: noexpandtab sw=8 ts=8 sts=0:
4  *
5  * xattr.c
6  *
7  * Copyright (C) 2004, 2008 Oracle.  All rights reserved.
8  *
9  * CREDITS:
10  * Lots of code in this file is copy from linux/fs/ext3/xattr.c.
11  * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
12  */
13
14 #include <linux/capability.h>
15 #include <linux/fs.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/highmem.h>
19 #include <linux/pagemap.h>
20 #include <linux/uio.h>
21 #include <linux/sched.h>
22 #include <linux/splice.h>
23 #include <linux/mount.h>
24 #include <linux/writeback.h>
25 #include <linux/falloc.h>
26 #include <linux/sort.h>
27 #include <linux/init.h>
28 #include <linux/module.h>
29 #include <linux/string.h>
30 #include <linux/security.h>
31
32 #include <cluster/masklog.h>
33
34 #include "ocfs2.h"
35 #include "alloc.h"
36 #include "blockcheck.h"
37 #include "dlmglue.h"
38 #include "file.h"
39 #include "symlink.h"
40 #include "sysfile.h"
41 #include "inode.h"
42 #include "journal.h"
43 #include "ocfs2_fs.h"
44 #include "suballoc.h"
45 #include "uptodate.h"
46 #include "buffer_head_io.h"
47 #include "super.h"
48 #include "xattr.h"
49 #include "refcounttree.h"
50 #include "acl.h"
51 #include "ocfs2_trace.h"
52
53 struct ocfs2_xattr_def_value_root {
54         struct ocfs2_xattr_value_root   xv;
55         struct ocfs2_extent_rec         er;
56 };
57
58 struct ocfs2_xattr_bucket {
59         /* The inode these xattrs are associated with */
60         struct inode *bu_inode;
61
62         /* The actual buffers that make up the bucket */
63         struct buffer_head *bu_bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET];
64
65         /* How many blocks make up one bucket for this filesystem */
66         int bu_blocks;
67 };
68
69 struct ocfs2_xattr_set_ctxt {
70         handle_t *handle;
71         struct ocfs2_alloc_context *meta_ac;
72         struct ocfs2_alloc_context *data_ac;
73         struct ocfs2_cached_dealloc_ctxt dealloc;
74         int set_abort;
75 };
76
77 #define OCFS2_XATTR_ROOT_SIZE   (sizeof(struct ocfs2_xattr_def_value_root))
78 #define OCFS2_XATTR_INLINE_SIZE 80
79 #define OCFS2_XATTR_HEADER_GAP  4
80 #define OCFS2_XATTR_FREE_IN_IBODY       (OCFS2_MIN_XATTR_INLINE_SIZE \
81                                          - sizeof(struct ocfs2_xattr_header) \
82                                          - OCFS2_XATTR_HEADER_GAP)
83 #define OCFS2_XATTR_FREE_IN_BLOCK(ptr)  ((ptr)->i_sb->s_blocksize \
84                                          - sizeof(struct ocfs2_xattr_block) \
85                                          - sizeof(struct ocfs2_xattr_header) \
86                                          - OCFS2_XATTR_HEADER_GAP)
87
88 static struct ocfs2_xattr_def_value_root def_xv = {
89         .xv.xr_list.l_count = cpu_to_le16(1),
90 };
91
92 const struct xattr_handler *ocfs2_xattr_handlers[] = {
93         &ocfs2_xattr_user_handler,
94         &posix_acl_access_xattr_handler,
95         &posix_acl_default_xattr_handler,
96         &ocfs2_xattr_trusted_handler,
97         &ocfs2_xattr_security_handler,
98         NULL
99 };
100
101 static const struct xattr_handler *ocfs2_xattr_handler_map[OCFS2_XATTR_MAX] = {
102         [OCFS2_XATTR_INDEX_USER]        = &ocfs2_xattr_user_handler,
103         [OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS]
104                                         = &posix_acl_access_xattr_handler,
105         [OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT]
106                                         = &posix_acl_default_xattr_handler,
107         [OCFS2_XATTR_INDEX_TRUSTED]     = &ocfs2_xattr_trusted_handler,
108         [OCFS2_XATTR_INDEX_SECURITY]    = &ocfs2_xattr_security_handler,
109 };
110
111 struct ocfs2_xattr_info {
112         int             xi_name_index;
113         const char      *xi_name;
114         int             xi_name_len;
115         const void      *xi_value;
116         size_t          xi_value_len;
117 };
118
119 struct ocfs2_xattr_search {
120         struct buffer_head *inode_bh;
121         /*
122          * xattr_bh point to the block buffer head which has extended attribute
123          * when extended attribute in inode, xattr_bh is equal to inode_bh.
124          */
125         struct buffer_head *xattr_bh;
126         struct ocfs2_xattr_header *header;
127         struct ocfs2_xattr_bucket *bucket;
128         void *base;
129         void *end;
130         struct ocfs2_xattr_entry *here;
131         int not_found;
132 };
133
134 /* Operations on struct ocfs2_xa_entry */
135 struct ocfs2_xa_loc;
136 struct ocfs2_xa_loc_operations {
137         /*
138          * Journal functions
139          */
140         int (*xlo_journal_access)(handle_t *handle, struct ocfs2_xa_loc *loc,
141                                   int type);
142         void (*xlo_journal_dirty)(handle_t *handle, struct ocfs2_xa_loc *loc);
143
144         /*
145          * Return a pointer to the appropriate buffer in loc->xl_storage
146          * at the given offset from loc->xl_header.
147          */
148         void *(*xlo_offset_pointer)(struct ocfs2_xa_loc *loc, int offset);
149
150         /* Can we reuse the existing entry for the new value? */
151         int (*xlo_can_reuse)(struct ocfs2_xa_loc *loc,
152                              struct ocfs2_xattr_info *xi);
153
154         /* How much space is needed for the new value? */
155         int (*xlo_check_space)(struct ocfs2_xa_loc *loc,
156                                struct ocfs2_xattr_info *xi);
157
158         /*
159          * Return the offset of the first name+value pair.  This is
160          * the start of our downward-filling free space.
161          */
162         int (*xlo_get_free_start)(struct ocfs2_xa_loc *loc);
163
164         /*
165          * Remove the name+value at this location.  Do whatever is
166          * appropriate with the remaining name+value pairs.
167          */
168         void (*xlo_wipe_namevalue)(struct ocfs2_xa_loc *loc);
169
170         /* Fill xl_entry with a new entry */
171         void (*xlo_add_entry)(struct ocfs2_xa_loc *loc, u32 name_hash);
172
173         /* Add name+value storage to an entry */
174         void (*xlo_add_namevalue)(struct ocfs2_xa_loc *loc, int size);
175
176         /*
177          * Initialize the value buf's access and bh fields for this entry.
178          * ocfs2_xa_fill_value_buf() will handle the xv pointer.
179          */
180         void (*xlo_fill_value_buf)(struct ocfs2_xa_loc *loc,
181                                    struct ocfs2_xattr_value_buf *vb);
182 };
183
184 /*
185  * Describes an xattr entry location.  This is a memory structure
186  * tracking the on-disk structure.
187  */
188 struct ocfs2_xa_loc {
189         /* This xattr belongs to this inode */
190         struct inode *xl_inode;
191
192         /* The ocfs2_xattr_header inside the on-disk storage. Not NULL. */
193         struct ocfs2_xattr_header *xl_header;
194
195         /* Bytes from xl_header to the end of the storage */
196         int xl_size;
197
198         /*
199          * The ocfs2_xattr_entry this location describes.  If this is
200          * NULL, this location describes the on-disk structure where it
201          * would have been.
202          */
203         struct ocfs2_xattr_entry *xl_entry;
204
205         /*
206          * Internal housekeeping
207          */
208
209         /* Buffer(s) containing this entry */
210         void *xl_storage;
211
212         /* Operations on the storage backing this location */
213         const struct ocfs2_xa_loc_operations *xl_ops;
214 };
215
216 /*
217  * Convenience functions to calculate how much space is needed for a
218  * given name+value pair
219  */
220 static int namevalue_size(int name_len, uint64_t value_len)
221 {
222         if (value_len > OCFS2_XATTR_INLINE_SIZE)
223                 return OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
224         else
225                 return OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(value_len);
226 }
227
228 static int namevalue_size_xi(struct ocfs2_xattr_info *xi)
229 {
230         return namevalue_size(xi->xi_name_len, xi->xi_value_len);
231 }
232
233 static int namevalue_size_xe(struct ocfs2_xattr_entry *xe)
234 {
235         u64 value_len = le64_to_cpu(xe->xe_value_size);
236
237         BUG_ON((value_len > OCFS2_XATTR_INLINE_SIZE) &&
238                ocfs2_xattr_is_local(xe));
239         return namevalue_size(xe->xe_name_len, value_len);
240 }
241
242
243 static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
244                                              struct ocfs2_xattr_header *xh,
245                                              int index,
246                                              int *block_off,
247                                              int *new_offset);
248
249 static int ocfs2_xattr_block_find(struct inode *inode,
250                                   int name_index,
251                                   const char *name,
252                                   struct ocfs2_xattr_search *xs);
253 static int ocfs2_xattr_index_block_find(struct inode *inode,
254                                         struct buffer_head *root_bh,
255                                         int name_index,
256                                         const char *name,
257                                         struct ocfs2_xattr_search *xs);
258
259 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
260                                         struct buffer_head *blk_bh,
261                                         char *buffer,
262                                         size_t buffer_size);
263
264 static int ocfs2_xattr_create_index_block(struct inode *inode,
265                                           struct ocfs2_xattr_search *xs,
266                                           struct ocfs2_xattr_set_ctxt *ctxt);
267
268 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
269                                              struct ocfs2_xattr_info *xi,
270                                              struct ocfs2_xattr_search *xs,
271                                              struct ocfs2_xattr_set_ctxt *ctxt);
272
273 typedef int (xattr_tree_rec_func)(struct inode *inode,
274                                   struct buffer_head *root_bh,
275                                   u64 blkno, u32 cpos, u32 len, void *para);
276 static int ocfs2_iterate_xattr_index_block(struct inode *inode,
277                                            struct buffer_head *root_bh,
278                                            xattr_tree_rec_func *rec_func,
279                                            void *para);
280 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
281                                         struct ocfs2_xattr_bucket *bucket,
282                                         void *para);
283 static int ocfs2_rm_xattr_cluster(struct inode *inode,
284                                   struct buffer_head *root_bh,
285                                   u64 blkno,
286                                   u32 cpos,
287                                   u32 len,
288                                   void *para);
289
290 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
291                                   u64 src_blk, u64 last_blk, u64 to_blk,
292                                   unsigned int start_bucket,
293                                   u32 *first_hash);
294 static int ocfs2_prepare_refcount_xattr(struct inode *inode,
295                                         struct ocfs2_dinode *di,
296                                         struct ocfs2_xattr_info *xi,
297                                         struct ocfs2_xattr_search *xis,
298                                         struct ocfs2_xattr_search *xbs,
299                                         struct ocfs2_refcount_tree **ref_tree,
300                                         int *meta_need,
301                                         int *credits);
302 static int ocfs2_get_xattr_tree_value_root(struct super_block *sb,
303                                            struct ocfs2_xattr_bucket *bucket,
304                                            int offset,
305                                            struct ocfs2_xattr_value_root **xv,
306                                            struct buffer_head **bh);
307
308 static inline u16 ocfs2_xattr_buckets_per_cluster(struct ocfs2_super *osb)
309 {
310         return (1 << osb->s_clustersize_bits) / OCFS2_XATTR_BUCKET_SIZE;
311 }
312
313 static inline u16 ocfs2_blocks_per_xattr_bucket(struct super_block *sb)
314 {
315         return OCFS2_XATTR_BUCKET_SIZE / (1 << sb->s_blocksize_bits);
316 }
317
318 #define bucket_blkno(_b) ((_b)->bu_bhs[0]->b_blocknr)
319 #define bucket_block(_b, _n) ((_b)->bu_bhs[(_n)]->b_data)
320 #define bucket_xh(_b) ((struct ocfs2_xattr_header *)bucket_block((_b), 0))
321
322 static struct ocfs2_xattr_bucket *ocfs2_xattr_bucket_new(struct inode *inode)
323 {
324         struct ocfs2_xattr_bucket *bucket;
325         int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
326
327         BUG_ON(blks > OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET);
328
329         bucket = kzalloc(sizeof(struct ocfs2_xattr_bucket), GFP_NOFS);
330         if (bucket) {
331                 bucket->bu_inode = inode;
332                 bucket->bu_blocks = blks;
333         }
334
335         return bucket;
336 }
337
338 static void ocfs2_xattr_bucket_relse(struct ocfs2_xattr_bucket *bucket)
339 {
340         int i;
341
342         for (i = 0; i < bucket->bu_blocks; i++) {
343                 brelse(bucket->bu_bhs[i]);
344                 bucket->bu_bhs[i] = NULL;
345         }
346 }
347
348 static void ocfs2_xattr_bucket_free(struct ocfs2_xattr_bucket *bucket)
349 {
350         if (bucket) {
351                 ocfs2_xattr_bucket_relse(bucket);
352                 bucket->bu_inode = NULL;
353                 kfree(bucket);
354         }
355 }
356
357 /*
358  * A bucket that has never been written to disk doesn't need to be
359  * read.  We just need the buffer_heads.  Don't call this for
360  * buckets that are already on disk.  ocfs2_read_xattr_bucket() initializes
361  * them fully.
362  */
363 static int ocfs2_init_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
364                                    u64 xb_blkno, int new)
365 {
366         int i, rc = 0;
367
368         for (i = 0; i < bucket->bu_blocks; i++) {
369                 bucket->bu_bhs[i] = sb_getblk(bucket->bu_inode->i_sb,
370                                               xb_blkno + i);
371                 if (!bucket->bu_bhs[i]) {
372                         rc = -ENOMEM;
373                         mlog_errno(rc);
374                         break;
375                 }
376
377                 if (!ocfs2_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
378                                            bucket->bu_bhs[i])) {
379                         if (new)
380                                 ocfs2_set_new_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
381                                                               bucket->bu_bhs[i]);
382                         else {
383                                 set_buffer_uptodate(bucket->bu_bhs[i]);
384                                 ocfs2_set_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
385                                                           bucket->bu_bhs[i]);
386                         }
387                 }
388         }
389
390         if (rc)
391                 ocfs2_xattr_bucket_relse(bucket);
392         return rc;
393 }
394
395 /* Read the xattr bucket at xb_blkno */
396 static int ocfs2_read_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
397                                    u64 xb_blkno)
398 {
399         int rc;
400
401         rc = ocfs2_read_blocks(INODE_CACHE(bucket->bu_inode), xb_blkno,
402                                bucket->bu_blocks, bucket->bu_bhs, 0,
403                                NULL);
404         if (!rc) {
405                 spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
406                 rc = ocfs2_validate_meta_ecc_bhs(bucket->bu_inode->i_sb,
407                                                  bucket->bu_bhs,
408                                                  bucket->bu_blocks,
409                                                  &bucket_xh(bucket)->xh_check);
410                 spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
411                 if (rc)
412                         mlog_errno(rc);
413         }
414
415         if (rc)
416                 ocfs2_xattr_bucket_relse(bucket);
417         return rc;
418 }
419
420 static int ocfs2_xattr_bucket_journal_access(handle_t *handle,
421                                              struct ocfs2_xattr_bucket *bucket,
422                                              int type)
423 {
424         int i, rc = 0;
425
426         for (i = 0; i < bucket->bu_blocks; i++) {
427                 rc = ocfs2_journal_access(handle,
428                                           INODE_CACHE(bucket->bu_inode),
429                                           bucket->bu_bhs[i], type);
430                 if (rc) {
431                         mlog_errno(rc);
432                         break;
433                 }
434         }
435
436         return rc;
437 }
438
439 static void ocfs2_xattr_bucket_journal_dirty(handle_t *handle,
440                                              struct ocfs2_xattr_bucket *bucket)
441 {
442         int i;
443
444         spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
445         ocfs2_compute_meta_ecc_bhs(bucket->bu_inode->i_sb,
446                                    bucket->bu_bhs, bucket->bu_blocks,
447                                    &bucket_xh(bucket)->xh_check);
448         spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
449
450         for (i = 0; i < bucket->bu_blocks; i++)
451                 ocfs2_journal_dirty(handle, bucket->bu_bhs[i]);
452 }
453
454 static void ocfs2_xattr_bucket_copy_data(struct ocfs2_xattr_bucket *dest,
455                                          struct ocfs2_xattr_bucket *src)
456 {
457         int i;
458         int blocksize = src->bu_inode->i_sb->s_blocksize;
459
460         BUG_ON(dest->bu_blocks != src->bu_blocks);
461         BUG_ON(dest->bu_inode != src->bu_inode);
462
463         for (i = 0; i < src->bu_blocks; i++) {
464                 memcpy(bucket_block(dest, i), bucket_block(src, i),
465                        blocksize);
466         }
467 }
468
469 static int ocfs2_validate_xattr_block(struct super_block *sb,
470                                       struct buffer_head *bh)
471 {
472         int rc;
473         struct ocfs2_xattr_block *xb =
474                 (struct ocfs2_xattr_block *)bh->b_data;
475
476         trace_ocfs2_validate_xattr_block((unsigned long long)bh->b_blocknr);
477
478         BUG_ON(!buffer_uptodate(bh));
479
480         /*
481          * If the ecc fails, we return the error but otherwise
482          * leave the filesystem running.  We know any error is
483          * local to this block.
484          */
485         rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &xb->xb_check);
486         if (rc)
487                 return rc;
488
489         /*
490          * Errors after here are fatal
491          */
492
493         if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
494                 return ocfs2_error(sb,
495                                    "Extended attribute block #%llu has bad signature %.*s\n",
496                                    (unsigned long long)bh->b_blocknr, 7,
497                                    xb->xb_signature);
498         }
499
500         if (le64_to_cpu(xb->xb_blkno) != bh->b_blocknr) {
501                 return ocfs2_error(sb,
502                                    "Extended attribute block #%llu has an invalid xb_blkno of %llu\n",
503                                    (unsigned long long)bh->b_blocknr,
504                                    (unsigned long long)le64_to_cpu(xb->xb_blkno));
505         }
506
507         if (le32_to_cpu(xb->xb_fs_generation) != OCFS2_SB(sb)->fs_generation) {
508                 return ocfs2_error(sb,
509                                    "Extended attribute block #%llu has an invalid xb_fs_generation of #%u\n",
510                                    (unsigned long long)bh->b_blocknr,
511                                    le32_to_cpu(xb->xb_fs_generation));
512         }
513
514         return 0;
515 }
516
517 static int ocfs2_read_xattr_block(struct inode *inode, u64 xb_blkno,
518                                   struct buffer_head **bh)
519 {
520         int rc;
521         struct buffer_head *tmp = *bh;
522
523         rc = ocfs2_read_block(INODE_CACHE(inode), xb_blkno, &tmp,
524                               ocfs2_validate_xattr_block);
525
526         /* If ocfs2_read_block() got us a new bh, pass it up. */
527         if (!rc && !*bh)
528                 *bh = tmp;
529
530         return rc;
531 }
532
533 static inline const char *ocfs2_xattr_prefix(int name_index)
534 {
535         const struct xattr_handler *handler = NULL;
536
537         if (name_index > 0 && name_index < OCFS2_XATTR_MAX)
538                 handler = ocfs2_xattr_handler_map[name_index];
539         return handler ? xattr_prefix(handler) : NULL;
540 }
541
542 static u32 ocfs2_xattr_name_hash(struct inode *inode,
543                                  const char *name,
544                                  int name_len)
545 {
546         /* Get hash value of uuid from super block */
547         u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash;
548         int i;
549
550         /* hash extended attribute name */
551         for (i = 0; i < name_len; i++) {
552                 hash = (hash << OCFS2_HASH_SHIFT) ^
553                        (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
554                        *name++;
555         }
556
557         return hash;
558 }
559
560 static int ocfs2_xattr_entry_real_size(int name_len, size_t value_len)
561 {
562         return namevalue_size(name_len, value_len) +
563                 sizeof(struct ocfs2_xattr_entry);
564 }
565
566 static int ocfs2_xi_entry_usage(struct ocfs2_xattr_info *xi)
567 {
568         return namevalue_size_xi(xi) +
569                 sizeof(struct ocfs2_xattr_entry);
570 }
571
572 static int ocfs2_xe_entry_usage(struct ocfs2_xattr_entry *xe)
573 {
574         return namevalue_size_xe(xe) +
575                 sizeof(struct ocfs2_xattr_entry);
576 }
577
578 int ocfs2_calc_security_init(struct inode *dir,
579                              struct ocfs2_security_xattr_info *si,
580                              int *want_clusters,
581                              int *xattr_credits,
582                              struct ocfs2_alloc_context **xattr_ac)
583 {
584         int ret = 0;
585         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
586         int s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
587                                                  si->value_len);
588
589         /*
590          * The max space of security xattr taken inline is
591          * 256(name) + 80(value) + 16(entry) = 352 bytes,
592          * So reserve one metadata block for it is ok.
593          */
594         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
595             s_size > OCFS2_XATTR_FREE_IN_IBODY) {
596                 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, xattr_ac);
597                 if (ret) {
598                         mlog_errno(ret);
599                         return ret;
600                 }
601                 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
602         }
603
604         /* reserve clusters for xattr value which will be set in B tree*/
605         if (si->value_len > OCFS2_XATTR_INLINE_SIZE) {
606                 int new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
607                                                             si->value_len);
608
609                 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
610                                                            new_clusters);
611                 *want_clusters += new_clusters;
612         }
613         return ret;
614 }
615
616 int ocfs2_calc_xattr_init(struct inode *dir,
617                           struct buffer_head *dir_bh,
618                           umode_t mode,
619                           struct ocfs2_security_xattr_info *si,
620                           int *want_clusters,
621                           int *xattr_credits,
622                           int *want_meta)
623 {
624         int ret = 0;
625         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
626         int s_size = 0, a_size = 0, acl_len = 0, new_clusters;
627
628         if (si->enable)
629                 s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
630                                                      si->value_len);
631
632         if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
633                 down_read(&OCFS2_I(dir)->ip_xattr_sem);
634                 acl_len = ocfs2_xattr_get_nolock(dir, dir_bh,
635                                         OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT,
636                                         "", NULL, 0);
637                 up_read(&OCFS2_I(dir)->ip_xattr_sem);
638                 if (acl_len > 0) {
639                         a_size = ocfs2_xattr_entry_real_size(0, acl_len);
640                         if (S_ISDIR(mode))
641                                 a_size <<= 1;
642                 } else if (acl_len != 0 && acl_len != -ENODATA) {
643                         ret = acl_len;
644                         mlog_errno(ret);
645                         return ret;
646                 }
647         }
648
649         if (!(s_size + a_size))
650                 return ret;
651
652         /*
653          * The max space of security xattr taken inline is
654          * 256(name) + 80(value) + 16(entry) = 352 bytes,
655          * The max space of acl xattr taken inline is
656          * 80(value) + 16(entry) * 2(if directory) = 192 bytes,
657          * when blocksize = 512, may reserve one more cluser for
658          * xattr bucket, otherwise reserve one metadata block
659          * for them is ok.
660          * If this is a new directory with inline data,
661          * we choose to reserve the entire inline area for
662          * directory contents and force an external xattr block.
663          */
664         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
665             (S_ISDIR(mode) && ocfs2_supports_inline_data(osb)) ||
666             (s_size + a_size) > OCFS2_XATTR_FREE_IN_IBODY) {
667                 *want_meta = *want_meta + 1;
668                 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
669         }
670
671         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE &&
672             (s_size + a_size) > OCFS2_XATTR_FREE_IN_BLOCK(dir)) {
673                 *want_clusters += 1;
674                 *xattr_credits += ocfs2_blocks_per_xattr_bucket(dir->i_sb);
675         }
676
677         /*
678          * reserve credits and clusters for xattrs which has large value
679          * and have to be set outside
680          */
681         if (si->enable && si->value_len > OCFS2_XATTR_INLINE_SIZE) {
682                 new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
683                                                         si->value_len);
684                 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
685                                                            new_clusters);
686                 *want_clusters += new_clusters;
687         }
688         if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL &&
689             acl_len > OCFS2_XATTR_INLINE_SIZE) {
690                 /* for directory, it has DEFAULT and ACCESS two types of acls */
691                 new_clusters = (S_ISDIR(mode) ? 2 : 1) *
692                                 ocfs2_clusters_for_bytes(dir->i_sb, acl_len);
693                 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
694                                                            new_clusters);
695                 *want_clusters += new_clusters;
696         }
697
698         return ret;
699 }
700
701 static int ocfs2_xattr_extend_allocation(struct inode *inode,
702                                          u32 clusters_to_add,
703                                          struct ocfs2_xattr_value_buf *vb,
704                                          struct ocfs2_xattr_set_ctxt *ctxt)
705 {
706         int status = 0, credits;
707         handle_t *handle = ctxt->handle;
708         enum ocfs2_alloc_restarted why;
709         u32 prev_clusters, logical_start = le32_to_cpu(vb->vb_xv->xr_clusters);
710         struct ocfs2_extent_tree et;
711
712         ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
713
714         while (clusters_to_add) {
715                 trace_ocfs2_xattr_extend_allocation(clusters_to_add);
716
717                 status = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
718                                        OCFS2_JOURNAL_ACCESS_WRITE);
719                 if (status < 0) {
720                         mlog_errno(status);
721                         break;
722                 }
723
724                 prev_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
725                 status = ocfs2_add_clusters_in_btree(handle,
726                                                      &et,
727                                                      &logical_start,
728                                                      clusters_to_add,
729                                                      0,
730                                                      ctxt->data_ac,
731                                                      ctxt->meta_ac,
732                                                      &why);
733                 if ((status < 0) && (status != -EAGAIN)) {
734                         if (status != -ENOSPC)
735                                 mlog_errno(status);
736                         break;
737                 }
738
739                 ocfs2_journal_dirty(handle, vb->vb_bh);
740
741                 clusters_to_add -= le32_to_cpu(vb->vb_xv->xr_clusters) -
742                                          prev_clusters;
743
744                 if (why != RESTART_NONE && clusters_to_add) {
745                         /*
746                          * We can only fail in case the alloc file doesn't give
747                          * up enough clusters.
748                          */
749                         BUG_ON(why == RESTART_META);
750
751                         credits = ocfs2_calc_extend_credits(inode->i_sb,
752                                                             &vb->vb_xv->xr_list);
753                         status = ocfs2_extend_trans(handle, credits);
754                         if (status < 0) {
755                                 status = -ENOMEM;
756                                 mlog_errno(status);
757                                 break;
758                         }
759                 }
760         }
761
762         return status;
763 }
764
765 static int __ocfs2_remove_xattr_range(struct inode *inode,
766                                       struct ocfs2_xattr_value_buf *vb,
767                                       u32 cpos, u32 phys_cpos, u32 len,
768                                       unsigned int ext_flags,
769                                       struct ocfs2_xattr_set_ctxt *ctxt)
770 {
771         int ret;
772         u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
773         handle_t *handle = ctxt->handle;
774         struct ocfs2_extent_tree et;
775
776         ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
777
778         ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
779                             OCFS2_JOURNAL_ACCESS_WRITE);
780         if (ret) {
781                 mlog_errno(ret);
782                 goto out;
783         }
784
785         ret = ocfs2_remove_extent(handle, &et, cpos, len, ctxt->meta_ac,
786                                   &ctxt->dealloc);
787         if (ret) {
788                 mlog_errno(ret);
789                 goto out;
790         }
791
792         le32_add_cpu(&vb->vb_xv->xr_clusters, -len);
793         ocfs2_journal_dirty(handle, vb->vb_bh);
794
795         if (ext_flags & OCFS2_EXT_REFCOUNTED)
796                 ret = ocfs2_decrease_refcount(inode, handle,
797                                         ocfs2_blocks_to_clusters(inode->i_sb,
798                                                                  phys_blkno),
799                                         len, ctxt->meta_ac, &ctxt->dealloc, 1);
800         else
801                 ret = ocfs2_cache_cluster_dealloc(&ctxt->dealloc,
802                                                   phys_blkno, len);
803         if (ret)
804                 mlog_errno(ret);
805
806 out:
807         return ret;
808 }
809
810 static int ocfs2_xattr_shrink_size(struct inode *inode,
811                                    u32 old_clusters,
812                                    u32 new_clusters,
813                                    struct ocfs2_xattr_value_buf *vb,
814                                    struct ocfs2_xattr_set_ctxt *ctxt)
815 {
816         int ret = 0;
817         unsigned int ext_flags;
818         u32 trunc_len, cpos, phys_cpos, alloc_size;
819         u64 block;
820
821         if (old_clusters <= new_clusters)
822                 return 0;
823
824         cpos = new_clusters;
825         trunc_len = old_clusters - new_clusters;
826         while (trunc_len) {
827                 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
828                                                &alloc_size,
829                                                &vb->vb_xv->xr_list, &ext_flags);
830                 if (ret) {
831                         mlog_errno(ret);
832                         goto out;
833                 }
834
835                 if (alloc_size > trunc_len)
836                         alloc_size = trunc_len;
837
838                 ret = __ocfs2_remove_xattr_range(inode, vb, cpos,
839                                                  phys_cpos, alloc_size,
840                                                  ext_flags, ctxt);
841                 if (ret) {
842                         mlog_errno(ret);
843                         goto out;
844                 }
845
846                 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
847                 ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode),
848                                                        block, alloc_size);
849                 cpos += alloc_size;
850                 trunc_len -= alloc_size;
851         }
852
853 out:
854         return ret;
855 }
856
857 static int ocfs2_xattr_value_truncate(struct inode *inode,
858                                       struct ocfs2_xattr_value_buf *vb,
859                                       int len,
860                                       struct ocfs2_xattr_set_ctxt *ctxt)
861 {
862         int ret;
863         u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
864         u32 old_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
865
866         if (new_clusters == old_clusters)
867                 return 0;
868
869         if (new_clusters > old_clusters)
870                 ret = ocfs2_xattr_extend_allocation(inode,
871                                                     new_clusters - old_clusters,
872                                                     vb, ctxt);
873         else
874                 ret = ocfs2_xattr_shrink_size(inode,
875                                               old_clusters, new_clusters,
876                                               vb, ctxt);
877
878         return ret;
879 }
880
881 static int ocfs2_xattr_list_entry(struct super_block *sb,
882                                   char *buffer, size_t size,
883                                   size_t *result, int type,
884                                   const char *name, int name_len)
885 {
886         char *p = buffer + *result;
887         const char *prefix;
888         int prefix_len;
889         int total_len;
890
891         switch(type) {
892         case OCFS2_XATTR_INDEX_USER:
893                 if (OCFS2_SB(sb)->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
894                         return 0;
895                 break;
896
897         case OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS:
898         case OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT:
899                 if (!(sb->s_flags & SB_POSIXACL))
900                         return 0;
901                 break;
902
903         case OCFS2_XATTR_INDEX_TRUSTED:
904                 if (!capable(CAP_SYS_ADMIN))
905                         return 0;
906                 break;
907         }
908
909         prefix = ocfs2_xattr_prefix(type);
910         if (!prefix)
911                 return 0;
912         prefix_len = strlen(prefix);
913         total_len = prefix_len + name_len + 1;
914         *result += total_len;
915
916         /* we are just looking for how big our buffer needs to be */
917         if (!size)
918                 return 0;
919
920         if (*result > size)
921                 return -ERANGE;
922
923         memcpy(p, prefix, prefix_len);
924         memcpy(p + prefix_len, name, name_len);
925         p[prefix_len + name_len] = '\0';
926
927         return 0;
928 }
929
930 static int ocfs2_xattr_list_entries(struct inode *inode,
931                                     struct ocfs2_xattr_header *header,
932                                     char *buffer, size_t buffer_size)
933 {
934         size_t result = 0;
935         int i, type, ret;
936         const char *name;
937
938         for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
939                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
940                 type = ocfs2_xattr_get_type(entry);
941                 name = (const char *)header +
942                         le16_to_cpu(entry->xe_name_offset);
943
944                 ret = ocfs2_xattr_list_entry(inode->i_sb,
945                                              buffer, buffer_size,
946                                              &result, type, name,
947                                              entry->xe_name_len);
948                 if (ret)
949                         return ret;
950         }
951
952         return result;
953 }
954
955 int ocfs2_has_inline_xattr_value_outside(struct inode *inode,
956                                          struct ocfs2_dinode *di)
957 {
958         struct ocfs2_xattr_header *xh;
959         int i;
960
961         xh = (struct ocfs2_xattr_header *)
962                  ((void *)di + inode->i_sb->s_blocksize -
963                  le16_to_cpu(di->i_xattr_inline_size));
964
965         for (i = 0; i < le16_to_cpu(xh->xh_count); i++)
966                 if (!ocfs2_xattr_is_local(&xh->xh_entries[i]))
967                         return 1;
968
969         return 0;
970 }
971
972 static int ocfs2_xattr_ibody_list(struct inode *inode,
973                                   struct ocfs2_dinode *di,
974                                   char *buffer,
975                                   size_t buffer_size)
976 {
977         struct ocfs2_xattr_header *header = NULL;
978         struct ocfs2_inode_info *oi = OCFS2_I(inode);
979         int ret = 0;
980
981         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
982                 return ret;
983
984         header = (struct ocfs2_xattr_header *)
985                  ((void *)di + inode->i_sb->s_blocksize -
986                  le16_to_cpu(di->i_xattr_inline_size));
987
988         ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size);
989
990         return ret;
991 }
992
993 static int ocfs2_xattr_block_list(struct inode *inode,
994                                   struct ocfs2_dinode *di,
995                                   char *buffer,
996                                   size_t buffer_size)
997 {
998         struct buffer_head *blk_bh = NULL;
999         struct ocfs2_xattr_block *xb;
1000         int ret = 0;
1001
1002         if (!di->i_xattr_loc)
1003                 return ret;
1004
1005         ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
1006                                      &blk_bh);
1007         if (ret < 0) {
1008                 mlog_errno(ret);
1009                 return ret;
1010         }
1011
1012         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1013         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
1014                 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
1015                 ret = ocfs2_xattr_list_entries(inode, header,
1016                                                buffer, buffer_size);
1017         } else
1018                 ret = ocfs2_xattr_tree_list_index_block(inode, blk_bh,
1019                                                    buffer, buffer_size);
1020
1021         brelse(blk_bh);
1022
1023         return ret;
1024 }
1025
1026 ssize_t ocfs2_listxattr(struct dentry *dentry,
1027                         char *buffer,
1028                         size_t size)
1029 {
1030         int ret = 0, i_ret = 0, b_ret = 0;
1031         struct buffer_head *di_bh = NULL;
1032         struct ocfs2_dinode *di = NULL;
1033         struct ocfs2_inode_info *oi = OCFS2_I(d_inode(dentry));
1034
1035         if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
1036                 return -EOPNOTSUPP;
1037
1038         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1039                 return ret;
1040
1041         ret = ocfs2_inode_lock(d_inode(dentry), &di_bh, 0);
1042         if (ret < 0) {
1043                 mlog_errno(ret);
1044                 return ret;
1045         }
1046
1047         di = (struct ocfs2_dinode *)di_bh->b_data;
1048
1049         down_read(&oi->ip_xattr_sem);
1050         i_ret = ocfs2_xattr_ibody_list(d_inode(dentry), di, buffer, size);
1051         if (i_ret < 0)
1052                 b_ret = 0;
1053         else {
1054                 if (buffer) {
1055                         buffer += i_ret;
1056                         size -= i_ret;
1057                 }
1058                 b_ret = ocfs2_xattr_block_list(d_inode(dentry), di,
1059                                                buffer, size);
1060                 if (b_ret < 0)
1061                         i_ret = 0;
1062         }
1063         up_read(&oi->ip_xattr_sem);
1064         ocfs2_inode_unlock(d_inode(dentry), 0);
1065
1066         brelse(di_bh);
1067
1068         return i_ret + b_ret;
1069 }
1070
1071 static int ocfs2_xattr_find_entry(int name_index,
1072                                   const char *name,
1073                                   struct ocfs2_xattr_search *xs)
1074 {
1075         struct ocfs2_xattr_entry *entry;
1076         size_t name_len;
1077         int i, cmp = 1;
1078
1079         if (name == NULL)
1080                 return -EINVAL;
1081
1082         name_len = strlen(name);
1083         entry = xs->here;
1084         for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
1085                 cmp = name_index - ocfs2_xattr_get_type(entry);
1086                 if (!cmp)
1087                         cmp = name_len - entry->xe_name_len;
1088                 if (!cmp)
1089                         cmp = memcmp(name, (xs->base +
1090                                      le16_to_cpu(entry->xe_name_offset)),
1091                                      name_len);
1092                 if (cmp == 0)
1093                         break;
1094                 entry += 1;
1095         }
1096         xs->here = entry;
1097
1098         return cmp ? -ENODATA : 0;
1099 }
1100
1101 static int ocfs2_xattr_get_value_outside(struct inode *inode,
1102                                          struct ocfs2_xattr_value_root *xv,
1103                                          void *buffer,
1104                                          size_t len)
1105 {
1106         u32 cpos, p_cluster, num_clusters, bpc, clusters;
1107         u64 blkno;
1108         int i, ret = 0;
1109         size_t cplen, blocksize;
1110         struct buffer_head *bh = NULL;
1111         struct ocfs2_extent_list *el;
1112
1113         el = &xv->xr_list;
1114         clusters = le32_to_cpu(xv->xr_clusters);
1115         bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1116         blocksize = inode->i_sb->s_blocksize;
1117
1118         cpos = 0;
1119         while (cpos < clusters) {
1120                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
1121                                                &num_clusters, el, NULL);
1122                 if (ret) {
1123                         mlog_errno(ret);
1124                         goto out;
1125                 }
1126
1127                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
1128                 /* Copy ocfs2_xattr_value */
1129                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1130                         ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
1131                                                &bh, NULL);
1132                         if (ret) {
1133                                 mlog_errno(ret);
1134                                 goto out;
1135                         }
1136
1137                         cplen = len >= blocksize ? blocksize : len;
1138                         memcpy(buffer, bh->b_data, cplen);
1139                         len -= cplen;
1140                         buffer += cplen;
1141
1142                         brelse(bh);
1143                         bh = NULL;
1144                         if (len == 0)
1145                                 break;
1146                 }
1147                 cpos += num_clusters;
1148         }
1149 out:
1150         return ret;
1151 }
1152
1153 static int ocfs2_xattr_ibody_get(struct inode *inode,
1154                                  int name_index,
1155                                  const char *name,
1156                                  void *buffer,
1157                                  size_t buffer_size,
1158                                  struct ocfs2_xattr_search *xs)
1159 {
1160         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1161         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1162         struct ocfs2_xattr_value_root *xv;
1163         size_t size;
1164         int ret = 0;
1165
1166         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
1167                 return -ENODATA;
1168
1169         xs->end = (void *)di + inode->i_sb->s_blocksize;
1170         xs->header = (struct ocfs2_xattr_header *)
1171                         (xs->end - le16_to_cpu(di->i_xattr_inline_size));
1172         xs->base = (void *)xs->header;
1173         xs->here = xs->header->xh_entries;
1174
1175         ret = ocfs2_xattr_find_entry(name_index, name, xs);
1176         if (ret)
1177                 return ret;
1178         size = le64_to_cpu(xs->here->xe_value_size);
1179         if (buffer) {
1180                 if (size > buffer_size)
1181                         return -ERANGE;
1182                 if (ocfs2_xattr_is_local(xs->here)) {
1183                         memcpy(buffer, (void *)xs->base +
1184                                le16_to_cpu(xs->here->xe_name_offset) +
1185                                OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
1186                 } else {
1187                         xv = (struct ocfs2_xattr_value_root *)
1188                                 (xs->base + le16_to_cpu(
1189                                  xs->here->xe_name_offset) +
1190                                 OCFS2_XATTR_SIZE(xs->here->xe_name_len));
1191                         ret = ocfs2_xattr_get_value_outside(inode, xv,
1192                                                             buffer, size);
1193                         if (ret < 0) {
1194                                 mlog_errno(ret);
1195                                 return ret;
1196                         }
1197                 }
1198         }
1199
1200         return size;
1201 }
1202
1203 static int ocfs2_xattr_block_get(struct inode *inode,
1204                                  int name_index,
1205                                  const char *name,
1206                                  void *buffer,
1207                                  size_t buffer_size,
1208                                  struct ocfs2_xattr_search *xs)
1209 {
1210         struct ocfs2_xattr_block *xb;
1211         struct ocfs2_xattr_value_root *xv;
1212         size_t size;
1213         int ret = -ENODATA, name_offset, name_len, i;
1214         int uninitialized_var(block_off);
1215
1216         xs->bucket = ocfs2_xattr_bucket_new(inode);
1217         if (!xs->bucket) {
1218                 ret = -ENOMEM;
1219                 mlog_errno(ret);
1220                 goto cleanup;
1221         }
1222
1223         ret = ocfs2_xattr_block_find(inode, name_index, name, xs);
1224         if (ret) {
1225                 mlog_errno(ret);
1226                 goto cleanup;
1227         }
1228
1229         if (xs->not_found) {
1230                 ret = -ENODATA;
1231                 goto cleanup;
1232         }
1233
1234         xb = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1235         size = le64_to_cpu(xs->here->xe_value_size);
1236         if (buffer) {
1237                 ret = -ERANGE;
1238                 if (size > buffer_size)
1239                         goto cleanup;
1240
1241                 name_offset = le16_to_cpu(xs->here->xe_name_offset);
1242                 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
1243                 i = xs->here - xs->header->xh_entries;
1244
1245                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
1246                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
1247                                                                 bucket_xh(xs->bucket),
1248                                                                 i,
1249                                                                 &block_off,
1250                                                                 &name_offset);
1251                         if (ret) {
1252                                 mlog_errno(ret);
1253                                 goto cleanup;
1254                         }
1255                         xs->base = bucket_block(xs->bucket, block_off);
1256                 }
1257                 if (ocfs2_xattr_is_local(xs->here)) {
1258                         memcpy(buffer, (void *)xs->base +
1259                                name_offset + name_len, size);
1260                 } else {
1261                         xv = (struct ocfs2_xattr_value_root *)
1262                                 (xs->base + name_offset + name_len);
1263                         ret = ocfs2_xattr_get_value_outside(inode, xv,
1264                                                             buffer, size);
1265                         if (ret < 0) {
1266                                 mlog_errno(ret);
1267                                 goto cleanup;
1268                         }
1269                 }
1270         }
1271         ret = size;
1272 cleanup:
1273         ocfs2_xattr_bucket_free(xs->bucket);
1274
1275         brelse(xs->xattr_bh);
1276         xs->xattr_bh = NULL;
1277         return ret;
1278 }
1279
1280 int ocfs2_xattr_get_nolock(struct inode *inode,
1281                            struct buffer_head *di_bh,
1282                            int name_index,
1283                            const char *name,
1284                            void *buffer,
1285                            size_t buffer_size)
1286 {
1287         int ret;
1288         struct ocfs2_dinode *di = NULL;
1289         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1290         struct ocfs2_xattr_search xis = {
1291                 .not_found = -ENODATA,
1292         };
1293         struct ocfs2_xattr_search xbs = {
1294                 .not_found = -ENODATA,
1295         };
1296
1297         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1298                 return -EOPNOTSUPP;
1299
1300         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1301                 return -ENODATA;
1302
1303         xis.inode_bh = xbs.inode_bh = di_bh;
1304         di = (struct ocfs2_dinode *)di_bh->b_data;
1305
1306         ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
1307                                     buffer_size, &xis);
1308         if (ret == -ENODATA && di->i_xattr_loc)
1309                 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
1310                                             buffer_size, &xbs);
1311
1312         return ret;
1313 }
1314
1315 /* ocfs2_xattr_get()
1316  *
1317  * Copy an extended attribute into the buffer provided.
1318  * Buffer is NULL to compute the size of buffer required.
1319  */
1320 static int ocfs2_xattr_get(struct inode *inode,
1321                            int name_index,
1322                            const char *name,
1323                            void *buffer,
1324                            size_t buffer_size)
1325 {
1326         int ret, had_lock;
1327         struct buffer_head *di_bh = NULL;
1328         struct ocfs2_lock_holder oh;
1329
1330         had_lock = ocfs2_inode_lock_tracker(inode, &di_bh, 0, &oh);
1331         if (had_lock < 0) {
1332                 mlog_errno(had_lock);
1333                 return had_lock;
1334         }
1335         down_read(&OCFS2_I(inode)->ip_xattr_sem);
1336         ret = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
1337                                      name, buffer, buffer_size);
1338         up_read(&OCFS2_I(inode)->ip_xattr_sem);
1339
1340         ocfs2_inode_unlock_tracker(inode, 0, &oh, had_lock);
1341
1342         brelse(di_bh);
1343
1344         return ret;
1345 }
1346
1347 static int __ocfs2_xattr_set_value_outside(struct inode *inode,
1348                                            handle_t *handle,
1349                                            struct ocfs2_xattr_value_buf *vb,
1350                                            const void *value,
1351                                            int value_len)
1352 {
1353         int ret = 0, i, cp_len;
1354         u16 blocksize = inode->i_sb->s_blocksize;
1355         u32 p_cluster, num_clusters;
1356         u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1357         u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
1358         u64 blkno;
1359         struct buffer_head *bh = NULL;
1360         unsigned int ext_flags;
1361         struct ocfs2_xattr_value_root *xv = vb->vb_xv;
1362
1363         BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
1364
1365         while (cpos < clusters) {
1366                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
1367                                                &num_clusters, &xv->xr_list,
1368                                                &ext_flags);
1369                 if (ret) {
1370                         mlog_errno(ret);
1371                         goto out;
1372                 }
1373
1374                 BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
1375
1376                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
1377
1378                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1379                         ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
1380                                                &bh, NULL);
1381                         if (ret) {
1382                                 mlog_errno(ret);
1383                                 goto out;
1384                         }
1385
1386                         ret = ocfs2_journal_access(handle,
1387                                                    INODE_CACHE(inode),
1388                                                    bh,
1389                                                    OCFS2_JOURNAL_ACCESS_WRITE);
1390                         if (ret < 0) {
1391                                 mlog_errno(ret);
1392                                 goto out;
1393                         }
1394
1395                         cp_len = value_len > blocksize ? blocksize : value_len;
1396                         memcpy(bh->b_data, value, cp_len);
1397                         value_len -= cp_len;
1398                         value += cp_len;
1399                         if (cp_len < blocksize)
1400                                 memset(bh->b_data + cp_len, 0,
1401                                        blocksize - cp_len);
1402
1403                         ocfs2_journal_dirty(handle, bh);
1404                         brelse(bh);
1405                         bh = NULL;
1406
1407                         /*
1408                          * XXX: do we need to empty all the following
1409                          * blocks in this cluster?
1410                          */
1411                         if (!value_len)
1412                                 break;
1413                 }
1414                 cpos += num_clusters;
1415         }
1416 out:
1417         brelse(bh);
1418
1419         return ret;
1420 }
1421
1422 static int ocfs2_xa_check_space_helper(int needed_space, int free_start,
1423                                        int num_entries)
1424 {
1425         int free_space;
1426
1427         if (!needed_space)
1428                 return 0;
1429
1430         free_space = free_start -
1431                 sizeof(struct ocfs2_xattr_header) -
1432                 (num_entries * sizeof(struct ocfs2_xattr_entry)) -
1433                 OCFS2_XATTR_HEADER_GAP;
1434         if (free_space < 0)
1435                 return -EIO;
1436         if (free_space < needed_space)
1437                 return -ENOSPC;
1438
1439         return 0;
1440 }
1441
1442 static int ocfs2_xa_journal_access(handle_t *handle, struct ocfs2_xa_loc *loc,
1443                                    int type)
1444 {
1445         return loc->xl_ops->xlo_journal_access(handle, loc, type);
1446 }
1447
1448 static void ocfs2_xa_journal_dirty(handle_t *handle, struct ocfs2_xa_loc *loc)
1449 {
1450         loc->xl_ops->xlo_journal_dirty(handle, loc);
1451 }
1452
1453 /* Give a pointer into the storage for the given offset */
1454 static void *ocfs2_xa_offset_pointer(struct ocfs2_xa_loc *loc, int offset)
1455 {
1456         BUG_ON(offset >= loc->xl_size);
1457         return loc->xl_ops->xlo_offset_pointer(loc, offset);
1458 }
1459
1460 /*
1461  * Wipe the name+value pair and allow the storage to reclaim it.  This
1462  * must be followed by either removal of the entry or a call to
1463  * ocfs2_xa_add_namevalue().
1464  */
1465 static void ocfs2_xa_wipe_namevalue(struct ocfs2_xa_loc *loc)
1466 {
1467         loc->xl_ops->xlo_wipe_namevalue(loc);
1468 }
1469
1470 /*
1471  * Find lowest offset to a name+value pair.  This is the start of our
1472  * downward-growing free space.
1473  */
1474 static int ocfs2_xa_get_free_start(struct ocfs2_xa_loc *loc)
1475 {
1476         return loc->xl_ops->xlo_get_free_start(loc);
1477 }
1478
1479 /* Can we reuse loc->xl_entry for xi? */
1480 static int ocfs2_xa_can_reuse_entry(struct ocfs2_xa_loc *loc,
1481                                     struct ocfs2_xattr_info *xi)
1482 {
1483         return loc->xl_ops->xlo_can_reuse(loc, xi);
1484 }
1485
1486 /* How much free space is needed to set the new value */
1487 static int ocfs2_xa_check_space(struct ocfs2_xa_loc *loc,
1488                                 struct ocfs2_xattr_info *xi)
1489 {
1490         return loc->xl_ops->xlo_check_space(loc, xi);
1491 }
1492
1493 static void ocfs2_xa_add_namevalue(struct ocfs2_xa_loc *loc,
1494                                    struct ocfs2_xattr_info *xi)
1495 {
1496         int size = namevalue_size_xi(xi);
1497         int nameval_offset;
1498         char *nameval_buf;
1499
1500         loc->xl_ops->xlo_add_namevalue(loc, size);
1501         loc->xl_entry->xe_value_size = cpu_to_le64(xi->xi_value_len);
1502         loc->xl_entry->xe_name_len = xi->xi_name_len;
1503         ocfs2_xattr_set_type(loc->xl_entry, xi->xi_name_index);
1504         ocfs2_xattr_set_local(loc->xl_entry,
1505                               xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE);
1506
1507         nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1508         nameval_buf = ocfs2_xa_offset_pointer(loc, nameval_offset);
1509         memset(nameval_buf, 0, size);
1510         memcpy(nameval_buf, xi->xi_name, xi->xi_name_len);
1511 }
1512
1513 static void ocfs2_xa_fill_value_buf(struct ocfs2_xa_loc *loc,
1514                                     struct ocfs2_xattr_value_buf *vb)
1515 {
1516         int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1517         int name_size = OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len);
1518
1519         /* Value bufs are for value trees */
1520         BUG_ON(ocfs2_xattr_is_local(loc->xl_entry));
1521         BUG_ON(namevalue_size_xe(loc->xl_entry) !=
1522                (name_size + OCFS2_XATTR_ROOT_SIZE));
1523
1524         loc->xl_ops->xlo_fill_value_buf(loc, vb);
1525         vb->vb_xv =
1526                 (struct ocfs2_xattr_value_root *)ocfs2_xa_offset_pointer(loc,
1527                                                         nameval_offset +
1528                                                         name_size);
1529 }
1530
1531 static int ocfs2_xa_block_journal_access(handle_t *handle,
1532                                          struct ocfs2_xa_loc *loc, int type)
1533 {
1534         struct buffer_head *bh = loc->xl_storage;
1535         ocfs2_journal_access_func access;
1536
1537         if (loc->xl_size == (bh->b_size -
1538                              offsetof(struct ocfs2_xattr_block,
1539                                       xb_attrs.xb_header)))
1540                 access = ocfs2_journal_access_xb;
1541         else
1542                 access = ocfs2_journal_access_di;
1543         return access(handle, INODE_CACHE(loc->xl_inode), bh, type);
1544 }
1545
1546 static void ocfs2_xa_block_journal_dirty(handle_t *handle,
1547                                          struct ocfs2_xa_loc *loc)
1548 {
1549         struct buffer_head *bh = loc->xl_storage;
1550
1551         ocfs2_journal_dirty(handle, bh);
1552 }
1553
1554 static void *ocfs2_xa_block_offset_pointer(struct ocfs2_xa_loc *loc,
1555                                            int offset)
1556 {
1557         return (char *)loc->xl_header + offset;
1558 }
1559
1560 static int ocfs2_xa_block_can_reuse(struct ocfs2_xa_loc *loc,
1561                                     struct ocfs2_xattr_info *xi)
1562 {
1563         /*
1564          * Block storage is strict.  If the sizes aren't exact, we will
1565          * remove the old one and reinsert the new.
1566          */
1567         return namevalue_size_xe(loc->xl_entry) ==
1568                 namevalue_size_xi(xi);
1569 }
1570
1571 static int ocfs2_xa_block_get_free_start(struct ocfs2_xa_loc *loc)
1572 {
1573         struct ocfs2_xattr_header *xh = loc->xl_header;
1574         int i, count = le16_to_cpu(xh->xh_count);
1575         int offset, free_start = loc->xl_size;
1576
1577         for (i = 0; i < count; i++) {
1578                 offset = le16_to_cpu(xh->xh_entries[i].xe_name_offset);
1579                 if (offset < free_start)
1580                         free_start = offset;
1581         }
1582
1583         return free_start;
1584 }
1585
1586 static int ocfs2_xa_block_check_space(struct ocfs2_xa_loc *loc,
1587                                       struct ocfs2_xattr_info *xi)
1588 {
1589         int count = le16_to_cpu(loc->xl_header->xh_count);
1590         int free_start = ocfs2_xa_get_free_start(loc);
1591         int needed_space = ocfs2_xi_entry_usage(xi);
1592
1593         /*
1594          * Block storage will reclaim the original entry before inserting
1595          * the new value, so we only need the difference.  If the new
1596          * entry is smaller than the old one, we don't need anything.
1597          */
1598         if (loc->xl_entry) {
1599                 /* Don't need space if we're reusing! */
1600                 if (ocfs2_xa_can_reuse_entry(loc, xi))
1601                         needed_space = 0;
1602                 else
1603                         needed_space -= ocfs2_xe_entry_usage(loc->xl_entry);
1604         }
1605         if (needed_space < 0)
1606                 needed_space = 0;
1607         return ocfs2_xa_check_space_helper(needed_space, free_start, count);
1608 }
1609
1610 /*
1611  * Block storage for xattrs keeps the name+value pairs compacted.  When
1612  * we remove one, we have to shift any that preceded it towards the end.
1613  */
1614 static void ocfs2_xa_block_wipe_namevalue(struct ocfs2_xa_loc *loc)
1615 {
1616         int i, offset;
1617         int namevalue_offset, first_namevalue_offset, namevalue_size;
1618         struct ocfs2_xattr_entry *entry = loc->xl_entry;
1619         struct ocfs2_xattr_header *xh = loc->xl_header;
1620         int count = le16_to_cpu(xh->xh_count);
1621
1622         namevalue_offset = le16_to_cpu(entry->xe_name_offset);
1623         namevalue_size = namevalue_size_xe(entry);
1624         first_namevalue_offset = ocfs2_xa_get_free_start(loc);
1625
1626         /* Shift the name+value pairs */
1627         memmove((char *)xh + first_namevalue_offset + namevalue_size,
1628                 (char *)xh + first_namevalue_offset,
1629                 namevalue_offset - first_namevalue_offset);
1630         memset((char *)xh + first_namevalue_offset, 0, namevalue_size);
1631
1632         /* Now tell xh->xh_entries about it */
1633         for (i = 0; i < count; i++) {
1634                 offset = le16_to_cpu(xh->xh_entries[i].xe_name_offset);
1635                 if (offset <= namevalue_offset)
1636                         le16_add_cpu(&xh->xh_entries[i].xe_name_offset,
1637                                      namevalue_size);
1638         }
1639
1640         /*
1641          * Note that we don't update xh_free_start or xh_name_value_len
1642          * because they're not used in block-stored xattrs.
1643          */
1644 }
1645
1646 static void ocfs2_xa_block_add_entry(struct ocfs2_xa_loc *loc, u32 name_hash)
1647 {
1648         int count = le16_to_cpu(loc->xl_header->xh_count);
1649         loc->xl_entry = &(loc->xl_header->xh_entries[count]);
1650         le16_add_cpu(&loc->xl_header->xh_count, 1);
1651         memset(loc->xl_entry, 0, sizeof(struct ocfs2_xattr_entry));
1652 }
1653
1654 static void ocfs2_xa_block_add_namevalue(struct ocfs2_xa_loc *loc, int size)
1655 {
1656         int free_start = ocfs2_xa_get_free_start(loc);
1657
1658         loc->xl_entry->xe_name_offset = cpu_to_le16(free_start - size);
1659 }
1660
1661 static void ocfs2_xa_block_fill_value_buf(struct ocfs2_xa_loc *loc,
1662                                           struct ocfs2_xattr_value_buf *vb)
1663 {
1664         struct buffer_head *bh = loc->xl_storage;
1665
1666         if (loc->xl_size == (bh->b_size -
1667                              offsetof(struct ocfs2_xattr_block,
1668                                       xb_attrs.xb_header)))
1669                 vb->vb_access = ocfs2_journal_access_xb;
1670         else
1671                 vb->vb_access = ocfs2_journal_access_di;
1672         vb->vb_bh = bh;
1673 }
1674
1675 /*
1676  * Operations for xattrs stored in blocks.  This includes inline inode
1677  * storage and unindexed ocfs2_xattr_blocks.
1678  */
1679 static const struct ocfs2_xa_loc_operations ocfs2_xa_block_loc_ops = {
1680         .xlo_journal_access     = ocfs2_xa_block_journal_access,
1681         .xlo_journal_dirty      = ocfs2_xa_block_journal_dirty,
1682         .xlo_offset_pointer     = ocfs2_xa_block_offset_pointer,
1683         .xlo_check_space        = ocfs2_xa_block_check_space,
1684         .xlo_can_reuse          = ocfs2_xa_block_can_reuse,
1685         .xlo_get_free_start     = ocfs2_xa_block_get_free_start,
1686         .xlo_wipe_namevalue     = ocfs2_xa_block_wipe_namevalue,
1687         .xlo_add_entry          = ocfs2_xa_block_add_entry,
1688         .xlo_add_namevalue      = ocfs2_xa_block_add_namevalue,
1689         .xlo_fill_value_buf     = ocfs2_xa_block_fill_value_buf,
1690 };
1691
1692 static int ocfs2_xa_bucket_journal_access(handle_t *handle,
1693                                           struct ocfs2_xa_loc *loc, int type)
1694 {
1695         struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1696
1697         return ocfs2_xattr_bucket_journal_access(handle, bucket, type);
1698 }
1699
1700 static void ocfs2_xa_bucket_journal_dirty(handle_t *handle,
1701                                           struct ocfs2_xa_loc *loc)
1702 {
1703         struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1704
1705         ocfs2_xattr_bucket_journal_dirty(handle, bucket);
1706 }
1707
1708 static void *ocfs2_xa_bucket_offset_pointer(struct ocfs2_xa_loc *loc,
1709                                             int offset)
1710 {
1711         struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1712         int block, block_offset;
1713
1714         /* The header is at the front of the bucket */
1715         block = offset >> loc->xl_inode->i_sb->s_blocksize_bits;
1716         block_offset = offset % loc->xl_inode->i_sb->s_blocksize;
1717
1718         return bucket_block(bucket, block) + block_offset;
1719 }
1720
1721 static int ocfs2_xa_bucket_can_reuse(struct ocfs2_xa_loc *loc,
1722                                      struct ocfs2_xattr_info *xi)
1723 {
1724         return namevalue_size_xe(loc->xl_entry) >=
1725                 namevalue_size_xi(xi);
1726 }
1727
1728 static int ocfs2_xa_bucket_get_free_start(struct ocfs2_xa_loc *loc)
1729 {
1730         struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1731         return le16_to_cpu(bucket_xh(bucket)->xh_free_start);
1732 }
1733
1734 static int ocfs2_bucket_align_free_start(struct super_block *sb,
1735                                          int free_start, int size)
1736 {
1737         /*
1738          * We need to make sure that the name+value pair fits within
1739          * one block.
1740          */
1741         if (((free_start - size) >> sb->s_blocksize_bits) !=
1742             ((free_start - 1) >> sb->s_blocksize_bits))
1743                 free_start -= free_start % sb->s_blocksize;
1744
1745         return free_start;
1746 }
1747
1748 static int ocfs2_xa_bucket_check_space(struct ocfs2_xa_loc *loc,
1749                                        struct ocfs2_xattr_info *xi)
1750 {
1751         int rc;
1752         int count = le16_to_cpu(loc->xl_header->xh_count);
1753         int free_start = ocfs2_xa_get_free_start(loc);
1754         int needed_space = ocfs2_xi_entry_usage(xi);
1755         int size = namevalue_size_xi(xi);
1756         struct super_block *sb = loc->xl_inode->i_sb;
1757
1758         /*
1759          * Bucket storage does not reclaim name+value pairs it cannot
1760          * reuse.  They live as holes until the bucket fills, and then
1761          * the bucket is defragmented.  However, the bucket can reclaim
1762          * the ocfs2_xattr_entry.
1763          */
1764         if (loc->xl_entry) {
1765                 /* Don't need space if we're reusing! */
1766                 if (ocfs2_xa_can_reuse_entry(loc, xi))
1767                         needed_space = 0;
1768                 else
1769                         needed_space -= sizeof(struct ocfs2_xattr_entry);
1770         }
1771         BUG_ON(needed_space < 0);
1772
1773         if (free_start < size) {
1774                 if (needed_space)
1775                         return -ENOSPC;
1776         } else {
1777                 /*
1778                  * First we check if it would fit in the first place.
1779                  * Below, we align the free start to a block.  This may
1780                  * slide us below the minimum gap.  By checking unaligned
1781                  * first, we avoid that error.
1782                  */
1783                 rc = ocfs2_xa_check_space_helper(needed_space, free_start,
1784                                                  count);
1785                 if (rc)
1786                         return rc;
1787                 free_start = ocfs2_bucket_align_free_start(sb, free_start,
1788                                                            size);
1789         }
1790         return ocfs2_xa_check_space_helper(needed_space, free_start, count);
1791 }
1792
1793 static void ocfs2_xa_bucket_wipe_namevalue(struct ocfs2_xa_loc *loc)
1794 {
1795         le16_add_cpu(&loc->xl_header->xh_name_value_len,
1796                      -namevalue_size_xe(loc->xl_entry));
1797 }
1798
1799 static void ocfs2_xa_bucket_add_entry(struct ocfs2_xa_loc *loc, u32 name_hash)
1800 {
1801         struct ocfs2_xattr_header *xh = loc->xl_header;
1802         int count = le16_to_cpu(xh->xh_count);
1803         int low = 0, high = count - 1, tmp;
1804         struct ocfs2_xattr_entry *tmp_xe;
1805
1806         /*
1807          * We keep buckets sorted by name_hash, so we need to find
1808          * our insert place.
1809          */
1810         while (low <= high && count) {
1811                 tmp = (low + high) / 2;
1812                 tmp_xe = &xh->xh_entries[tmp];
1813
1814                 if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
1815                         low = tmp + 1;
1816                 else if (name_hash < le32_to_cpu(tmp_xe->xe_name_hash))
1817                         high = tmp - 1;
1818                 else {
1819                         low = tmp;
1820                         break;
1821                 }
1822         }
1823
1824         if (low != count)
1825                 memmove(&xh->xh_entries[low + 1],
1826                         &xh->xh_entries[low],
1827                         ((count - low) * sizeof(struct ocfs2_xattr_entry)));
1828
1829         le16_add_cpu(&xh->xh_count, 1);
1830         loc->xl_entry = &xh->xh_entries[low];
1831         memset(loc->xl_entry, 0, sizeof(struct ocfs2_xattr_entry));
1832 }
1833
1834 static void ocfs2_xa_bucket_add_namevalue(struct ocfs2_xa_loc *loc, int size)
1835 {
1836         int free_start = ocfs2_xa_get_free_start(loc);
1837         struct ocfs2_xattr_header *xh = loc->xl_header;
1838         struct super_block *sb = loc->xl_inode->i_sb;
1839         int nameval_offset;
1840
1841         free_start = ocfs2_bucket_align_free_start(sb, free_start, size);
1842         nameval_offset = free_start - size;
1843         loc->xl_entry->xe_name_offset = cpu_to_le16(nameval_offset);
1844         xh->xh_free_start = cpu_to_le16(nameval_offset);
1845         le16_add_cpu(&xh->xh_name_value_len, size);
1846
1847 }
1848
1849 static void ocfs2_xa_bucket_fill_value_buf(struct ocfs2_xa_loc *loc,
1850                                            struct ocfs2_xattr_value_buf *vb)
1851 {
1852         struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1853         struct super_block *sb = loc->xl_inode->i_sb;
1854         int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1855         int size = namevalue_size_xe(loc->xl_entry);
1856         int block_offset = nameval_offset >> sb->s_blocksize_bits;
1857
1858         /* Values are not allowed to straddle block boundaries */
1859         BUG_ON(block_offset !=
1860                ((nameval_offset + size - 1) >> sb->s_blocksize_bits));
1861         /* We expect the bucket to be filled in */
1862         BUG_ON(!bucket->bu_bhs[block_offset]);
1863
1864         vb->vb_access = ocfs2_journal_access;
1865         vb->vb_bh = bucket->bu_bhs[block_offset];
1866 }
1867
1868 /* Operations for xattrs stored in buckets. */
1869 static const struct ocfs2_xa_loc_operations ocfs2_xa_bucket_loc_ops = {
1870         .xlo_journal_access     = ocfs2_xa_bucket_journal_access,
1871         .xlo_journal_dirty      = ocfs2_xa_bucket_journal_dirty,
1872         .xlo_offset_pointer     = ocfs2_xa_bucket_offset_pointer,
1873         .xlo_check_space        = ocfs2_xa_bucket_check_space,
1874         .xlo_can_reuse          = ocfs2_xa_bucket_can_reuse,
1875         .xlo_get_free_start     = ocfs2_xa_bucket_get_free_start,
1876         .xlo_wipe_namevalue     = ocfs2_xa_bucket_wipe_namevalue,
1877         .xlo_add_entry          = ocfs2_xa_bucket_add_entry,
1878         .xlo_add_namevalue      = ocfs2_xa_bucket_add_namevalue,
1879         .xlo_fill_value_buf     = ocfs2_xa_bucket_fill_value_buf,
1880 };
1881
1882 static unsigned int ocfs2_xa_value_clusters(struct ocfs2_xa_loc *loc)
1883 {
1884         struct ocfs2_xattr_value_buf vb;
1885
1886         if (ocfs2_xattr_is_local(loc->xl_entry))
1887                 return 0;
1888
1889         ocfs2_xa_fill_value_buf(loc, &vb);
1890         return le32_to_cpu(vb.vb_xv->xr_clusters);
1891 }
1892
1893 static int ocfs2_xa_value_truncate(struct ocfs2_xa_loc *loc, u64 bytes,
1894                                    struct ocfs2_xattr_set_ctxt *ctxt)
1895 {
1896         int trunc_rc, access_rc;
1897         struct ocfs2_xattr_value_buf vb;
1898
1899         ocfs2_xa_fill_value_buf(loc, &vb);
1900         trunc_rc = ocfs2_xattr_value_truncate(loc->xl_inode, &vb, bytes,
1901                                               ctxt);
1902
1903         /*
1904          * The caller of ocfs2_xa_value_truncate() has already called
1905          * ocfs2_xa_journal_access on the loc.  However, The truncate code
1906          * calls ocfs2_extend_trans().  This may commit the previous
1907          * transaction and open a new one.  If this is a bucket, truncate
1908          * could leave only vb->vb_bh set up for journaling.  Meanwhile,
1909          * the caller is expecting to dirty the entire bucket.  So we must
1910          * reset the journal work.  We do this even if truncate has failed,
1911          * as it could have failed after committing the extend.
1912          */
1913         access_rc = ocfs2_xa_journal_access(ctxt->handle, loc,
1914                                             OCFS2_JOURNAL_ACCESS_WRITE);
1915
1916         /* Errors in truncate take precedence */
1917         return trunc_rc ? trunc_rc : access_rc;
1918 }
1919
1920 static void ocfs2_xa_remove_entry(struct ocfs2_xa_loc *loc)
1921 {
1922         int index, count;
1923         struct ocfs2_xattr_header *xh = loc->xl_header;
1924         struct ocfs2_xattr_entry *entry = loc->xl_entry;
1925
1926         ocfs2_xa_wipe_namevalue(loc);
1927         loc->xl_entry = NULL;
1928
1929         le16_add_cpu(&xh->xh_count, -1);
1930         count = le16_to_cpu(xh->xh_count);
1931
1932         /*
1933          * Only zero out the entry if there are more remaining.  This is
1934          * important for an empty bucket, as it keeps track of the
1935          * bucket's hash value.  It doesn't hurt empty block storage.
1936          */
1937         if (count) {
1938                 index = ((char *)entry - (char *)&xh->xh_entries) /
1939                         sizeof(struct ocfs2_xattr_entry);
1940                 memmove(&xh->xh_entries[index], &xh->xh_entries[index + 1],
1941                         (count - index) * sizeof(struct ocfs2_xattr_entry));
1942                 memset(&xh->xh_entries[count], 0,
1943                        sizeof(struct ocfs2_xattr_entry));
1944         }
1945 }
1946
1947 /*
1948  * If we have a problem adjusting the size of an external value during
1949  * ocfs2_xa_prepare_entry() or ocfs2_xa_remove(), we may have an xattr
1950  * in an intermediate state.  For example, the value may be partially
1951  * truncated.
1952  *
1953  * If the value tree hasn't changed, the extend/truncate went nowhere.
1954  * We have nothing to do.  The caller can treat it as a straight error.
1955  *
1956  * If the value tree got partially truncated, we now have a corrupted
1957  * extended attribute.  We're going to wipe its entry and leak the
1958  * clusters.  Better to leak some storage than leave a corrupt entry.
1959  *
1960  * If the value tree grew, it obviously didn't grow enough for the
1961  * new entry.  We're not going to try and reclaim those clusters either.
1962  * If there was already an external value there (orig_clusters != 0),
1963  * the new clusters are attached safely and we can just leave the old
1964  * value in place.  If there was no external value there, we remove
1965  * the entry.
1966  *
1967  * This way, the xattr block we store in the journal will be consistent.
1968  * If the size change broke because of the journal, no changes will hit
1969  * disk anyway.
1970  */
1971 static void ocfs2_xa_cleanup_value_truncate(struct ocfs2_xa_loc *loc,
1972                                             const char *what,
1973                                             unsigned int orig_clusters)
1974 {
1975         unsigned int new_clusters = ocfs2_xa_value_clusters(loc);
1976         char *nameval_buf = ocfs2_xa_offset_pointer(loc,
1977                                 le16_to_cpu(loc->xl_entry->xe_name_offset));
1978
1979         if (new_clusters < orig_clusters) {
1980                 mlog(ML_ERROR,
1981                      "Partial truncate while %s xattr %.*s.  Leaking "
1982                      "%u clusters and removing the entry\n",
1983                      what, loc->xl_entry->xe_name_len, nameval_buf,
1984                      orig_clusters - new_clusters);
1985                 ocfs2_xa_remove_entry(loc);
1986         } else if (!orig_clusters) {
1987                 mlog(ML_ERROR,
1988                      "Unable to allocate an external value for xattr "
1989                      "%.*s safely.  Leaking %u clusters and removing the "
1990                      "entry\n",
1991                      loc->xl_entry->xe_name_len, nameval_buf,
1992                      new_clusters - orig_clusters);
1993                 ocfs2_xa_remove_entry(loc);
1994         } else if (new_clusters > orig_clusters)
1995                 mlog(ML_ERROR,
1996                      "Unable to grow xattr %.*s safely.  %u new clusters "
1997                      "have been added, but the value will not be "
1998                      "modified\n",
1999                      loc->xl_entry->xe_name_len, nameval_buf,
2000                      new_clusters - orig_clusters);
2001 }
2002
2003 static int ocfs2_xa_remove(struct ocfs2_xa_loc *loc,
2004                            struct ocfs2_xattr_set_ctxt *ctxt)
2005 {
2006         int rc = 0;
2007         unsigned int orig_clusters;
2008
2009         if (!ocfs2_xattr_is_local(loc->xl_entry)) {
2010                 orig_clusters = ocfs2_xa_value_clusters(loc);
2011                 rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2012                 if (rc) {
2013                         mlog_errno(rc);
2014                         /*
2015                          * Since this is remove, we can return 0 if
2016                          * ocfs2_xa_cleanup_value_truncate() is going to
2017                          * wipe the entry anyway.  So we check the
2018                          * cluster count as well.
2019                          */
2020                         if (orig_clusters != ocfs2_xa_value_clusters(loc))
2021                                 rc = 0;
2022                         ocfs2_xa_cleanup_value_truncate(loc, "removing",
2023                                                         orig_clusters);
2024                         if (rc)
2025                                 goto out;
2026                 }
2027         }
2028
2029         ocfs2_xa_remove_entry(loc);
2030
2031 out:
2032         return rc;
2033 }
2034
2035 static void ocfs2_xa_install_value_root(struct ocfs2_xa_loc *loc)
2036 {
2037         int name_size = OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len);
2038         char *nameval_buf;
2039
2040         nameval_buf = ocfs2_xa_offset_pointer(loc,
2041                                 le16_to_cpu(loc->xl_entry->xe_name_offset));
2042         memcpy(nameval_buf + name_size, &def_xv, OCFS2_XATTR_ROOT_SIZE);
2043 }
2044
2045 /*
2046  * Take an existing entry and make it ready for the new value.  This
2047  * won't allocate space, but it may free space.  It should be ready for
2048  * ocfs2_xa_prepare_entry() to finish the work.
2049  */
2050 static int ocfs2_xa_reuse_entry(struct ocfs2_xa_loc *loc,
2051                                 struct ocfs2_xattr_info *xi,
2052                                 struct ocfs2_xattr_set_ctxt *ctxt)
2053 {
2054         int rc = 0;
2055         int name_size = OCFS2_XATTR_SIZE(xi->xi_name_len);
2056         unsigned int orig_clusters;
2057         char *nameval_buf;
2058         int xe_local = ocfs2_xattr_is_local(loc->xl_entry);
2059         int xi_local = xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE;
2060
2061         BUG_ON(OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len) !=
2062                name_size);
2063
2064         nameval_buf = ocfs2_xa_offset_pointer(loc,
2065                                 le16_to_cpu(loc->xl_entry->xe_name_offset));
2066         if (xe_local) {
2067                 memset(nameval_buf + name_size, 0,
2068                        namevalue_size_xe(loc->xl_entry) - name_size);
2069                 if (!xi_local)
2070                         ocfs2_xa_install_value_root(loc);
2071         } else {
2072                 orig_clusters = ocfs2_xa_value_clusters(loc);
2073                 if (xi_local) {
2074                         rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2075                         if (rc < 0)
2076                                 mlog_errno(rc);
2077                         else
2078                                 memset(nameval_buf + name_size, 0,
2079                                        namevalue_size_xe(loc->xl_entry) -
2080                                        name_size);
2081                 } else if (le64_to_cpu(loc->xl_entry->xe_value_size) >
2082                            xi->xi_value_len) {
2083                         rc = ocfs2_xa_value_truncate(loc, xi->xi_value_len,
2084                                                      ctxt);
2085                         if (rc < 0)
2086                                 mlog_errno(rc);
2087                 }
2088
2089                 if (rc) {
2090                         ocfs2_xa_cleanup_value_truncate(loc, "reusing",
2091                                                         orig_clusters);
2092                         goto out;
2093                 }
2094         }
2095
2096         loc->xl_entry->xe_value_size = cpu_to_le64(xi->xi_value_len);
2097         ocfs2_xattr_set_local(loc->xl_entry, xi_local);
2098
2099 out:
2100         return rc;
2101 }
2102
2103 /*
2104  * Prepares loc->xl_entry to receive the new xattr.  This includes
2105  * properly setting up the name+value pair region.  If loc->xl_entry
2106  * already exists, it will take care of modifying it appropriately.
2107  *
2108  * Note that this modifies the data.  You did journal_access already,
2109  * right?
2110  */
2111 static int ocfs2_xa_prepare_entry(struct ocfs2_xa_loc *loc,
2112                                   struct ocfs2_xattr_info *xi,
2113                                   u32 name_hash,
2114                                   struct ocfs2_xattr_set_ctxt *ctxt)
2115 {
2116         int rc = 0;
2117         unsigned int orig_clusters;
2118         __le64 orig_value_size = 0;
2119
2120         rc = ocfs2_xa_check_space(loc, xi);
2121         if (rc)
2122                 goto out;
2123
2124         if (!loc->xl_entry) {
2125                 rc = -EINVAL;
2126                 goto out;
2127         }
2128
2129         if (ocfs2_xa_can_reuse_entry(loc, xi)) {
2130                 orig_value_size = loc->xl_entry->xe_value_size;
2131                 rc = ocfs2_xa_reuse_entry(loc, xi, ctxt);
2132                 if (rc)
2133                         goto out;
2134                 goto alloc_value;
2135         }
2136
2137         if (!ocfs2_xattr_is_local(loc->xl_entry)) {
2138                 orig_clusters = ocfs2_xa_value_clusters(loc);
2139                 rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2140                 if (rc) {
2141                         mlog_errno(rc);
2142                         ocfs2_xa_cleanup_value_truncate(loc,
2143                                                         "overwriting",
2144                                                         orig_clusters);
2145                         goto out;
2146                 }
2147         }
2148         ocfs2_xa_wipe_namevalue(loc);
2149
2150         /*
2151          * If we get here, we have a blank entry.  Fill it.  We grow our
2152          * name+value pair back from the end.
2153          */
2154         ocfs2_xa_add_namevalue(loc, xi);
2155         if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE)
2156                 ocfs2_xa_install_value_root(loc);
2157
2158 alloc_value:
2159         if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
2160                 orig_clusters = ocfs2_xa_value_clusters(loc);
2161                 rc = ocfs2_xa_value_truncate(loc, xi->xi_value_len, ctxt);
2162                 if (rc < 0) {
2163                         ctxt->set_abort = 1;
2164                         ocfs2_xa_cleanup_value_truncate(loc, "growing",
2165                                                         orig_clusters);
2166                         /*
2167                          * If we were growing an existing value,
2168                          * ocfs2_xa_cleanup_value_truncate() won't remove
2169                          * the entry. We need to restore the original value
2170                          * size.
2171                          */
2172                         if (loc->xl_entry) {
2173                                 BUG_ON(!orig_value_size);
2174                                 loc->xl_entry->xe_value_size = orig_value_size;
2175                         }
2176                         mlog_errno(rc);
2177                 }
2178         }
2179
2180 out:
2181         return rc;
2182 }
2183
2184 /*
2185  * Store the value portion of the name+value pair.  This will skip
2186  * values that are stored externally.  Their tree roots were set up
2187  * by ocfs2_xa_prepare_entry().
2188  */
2189 static int ocfs2_xa_store_value(struct ocfs2_xa_loc *loc,
2190                                 struct ocfs2_xattr_info *xi,
2191                                 struct ocfs2_xattr_set_ctxt *ctxt)
2192 {
2193         int rc = 0;
2194         int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
2195         int name_size = OCFS2_XATTR_SIZE(xi->xi_name_len);
2196         char *nameval_buf;
2197         struct ocfs2_xattr_value_buf vb;
2198
2199         nameval_buf = ocfs2_xa_offset_pointer(loc, nameval_offset);
2200         if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
2201                 ocfs2_xa_fill_value_buf(loc, &vb);
2202                 rc = __ocfs2_xattr_set_value_outside(loc->xl_inode,
2203                                                      ctxt->handle, &vb,
2204                                                      xi->xi_value,
2205                                                      xi->xi_value_len);
2206         } else
2207                 memcpy(nameval_buf + name_size, xi->xi_value, xi->xi_value_len);
2208
2209         return rc;
2210 }
2211
2212 static int ocfs2_xa_set(struct ocfs2_xa_loc *loc,
2213                         struct ocfs2_xattr_info *xi,
2214                         struct ocfs2_xattr_set_ctxt *ctxt)
2215 {
2216         int ret;
2217         u32 name_hash = ocfs2_xattr_name_hash(loc->xl_inode, xi->xi_name,
2218                                               xi->xi_name_len);
2219
2220         ret = ocfs2_xa_journal_access(ctxt->handle, loc,
2221                                       OCFS2_JOURNAL_ACCESS_WRITE);
2222         if (ret) {
2223                 mlog_errno(ret);
2224                 goto out;
2225         }
2226
2227         /*
2228          * From here on out, everything is going to modify the buffer a
2229          * little.  Errors are going to leave the xattr header in a
2230          * sane state.  Thus, even with errors we dirty the sucker.
2231          */
2232
2233         /* Don't worry, we are never called with !xi_value and !xl_entry */
2234         if (!xi->xi_value) {
2235                 ret = ocfs2_xa_remove(loc, ctxt);
2236                 goto out_dirty;
2237         }
2238
2239         ret = ocfs2_xa_prepare_entry(loc, xi, name_hash, ctxt);
2240         if (ret) {
2241                 if (ret != -ENOSPC)
2242                         mlog_errno(ret);
2243                 goto out_dirty;
2244         }
2245
2246         ret = ocfs2_xa_store_value(loc, xi, ctxt);
2247         if (ret)
2248                 mlog_errno(ret);
2249
2250 out_dirty:
2251         ocfs2_xa_journal_dirty(ctxt->handle, loc);
2252
2253 out:
2254         return ret;
2255 }
2256
2257 static void ocfs2_init_dinode_xa_loc(struct ocfs2_xa_loc *loc,
2258                                      struct inode *inode,
2259                                      struct buffer_head *bh,
2260                                      struct ocfs2_xattr_entry *entry)
2261 {
2262         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
2263
2264         BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_XATTR_FL));
2265
2266         loc->xl_inode = inode;
2267         loc->xl_ops = &ocfs2_xa_block_loc_ops;
2268         loc->xl_storage = bh;
2269         loc->xl_entry = entry;
2270         loc->xl_size = le16_to_cpu(di->i_xattr_inline_size);
2271         loc->xl_header =
2272                 (struct ocfs2_xattr_header *)(bh->b_data + bh->b_size -
2273                                               loc->xl_size);
2274 }
2275
2276 static void ocfs2_init_xattr_block_xa_loc(struct ocfs2_xa_loc *loc,
2277                                           struct inode *inode,
2278                                           struct buffer_head *bh,
2279                                           struct ocfs2_xattr_entry *entry)
2280 {
2281         struct ocfs2_xattr_block *xb =
2282                 (struct ocfs2_xattr_block *)bh->b_data;
2283
2284         BUG_ON(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED);
2285
2286         loc->xl_inode = inode;
2287         loc->xl_ops = &ocfs2_xa_block_loc_ops;
2288         loc->xl_storage = bh;
2289         loc->xl_header = &(xb->xb_attrs.xb_header);
2290         loc->xl_entry = entry;
2291         loc->xl_size = bh->b_size - offsetof(struct ocfs2_xattr_block,
2292                                              xb_attrs.xb_header);
2293 }
2294
2295 static void ocfs2_init_xattr_bucket_xa_loc(struct ocfs2_xa_loc *loc,
2296                                            struct ocfs2_xattr_bucket *bucket,
2297                                            struct ocfs2_xattr_entry *entry)
2298 {
2299         loc->xl_inode = bucket->bu_inode;
2300         loc->xl_ops = &ocfs2_xa_bucket_loc_ops;
2301         loc->xl_storage = bucket;
2302         loc->xl_header = bucket_xh(bucket);
2303         loc->xl_entry = entry;
2304         loc->xl_size = OCFS2_XATTR_BUCKET_SIZE;
2305 }
2306
2307 /*
2308  * In xattr remove, if it is stored outside and refcounted, we may have
2309  * the chance to split the refcount tree. So need the allocators.
2310  */
2311 static int ocfs2_lock_xattr_remove_allocators(struct inode *inode,
2312                                         struct ocfs2_xattr_value_root *xv,
2313                                         struct ocfs2_caching_info *ref_ci,
2314                                         struct buffer_head *ref_root_bh,
2315                                         struct ocfs2_alloc_context **meta_ac,
2316                                         int *ref_credits)
2317 {
2318         int ret, meta_add = 0;
2319         u32 p_cluster, num_clusters;
2320         unsigned int ext_flags;
2321
2322         *ref_credits = 0;
2323         ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
2324                                        &num_clusters,
2325                                        &xv->xr_list,
2326                                        &ext_flags);
2327         if (ret) {
2328                 mlog_errno(ret);
2329                 goto out;
2330         }
2331
2332         if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
2333                 goto out;
2334
2335         ret = ocfs2_refcounted_xattr_delete_need(inode, ref_ci,
2336                                                  ref_root_bh, xv,
2337                                                  &meta_add, ref_credits);
2338         if (ret) {
2339                 mlog_errno(ret);
2340                 goto out;
2341         }
2342
2343         ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb),
2344                                                 meta_add, meta_ac);
2345         if (ret)
2346                 mlog_errno(ret);
2347
2348 out:
2349         return ret;
2350 }
2351
2352 static int ocfs2_remove_value_outside(struct inode*inode,
2353                                       struct ocfs2_xattr_value_buf *vb,
2354                                       struct ocfs2_xattr_header *header,
2355                                       struct ocfs2_caching_info *ref_ci,
2356                                       struct buffer_head *ref_root_bh)
2357 {
2358         int ret = 0, i, ref_credits;
2359         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2360         struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
2361         void *val;
2362
2363         ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
2364
2365         for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
2366                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
2367
2368                 if (ocfs2_xattr_is_local(entry))
2369                         continue;
2370
2371                 val = (void *)header +
2372                         le16_to_cpu(entry->xe_name_offset);
2373                 vb->vb_xv = (struct ocfs2_xattr_value_root *)
2374                         (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
2375
2376                 ret = ocfs2_lock_xattr_remove_allocators(inode, vb->vb_xv,
2377                                                          ref_ci, ref_root_bh,
2378                                                          &ctxt.meta_ac,
2379                                                          &ref_credits);
2380
2381                 ctxt.handle = ocfs2_start_trans(osb, ref_credits +
2382                                         ocfs2_remove_extent_credits(osb->sb));
2383                 if (IS_ERR(ctxt.handle)) {
2384                         ret = PTR_ERR(ctxt.handle);
2385                         mlog_errno(ret);
2386                         break;
2387                 }
2388
2389                 ret = ocfs2_xattr_value_truncate(inode, vb, 0, &ctxt);
2390
2391                 ocfs2_commit_trans(osb, ctxt.handle);
2392                 if (ctxt.meta_ac) {
2393                         ocfs2_free_alloc_context(ctxt.meta_ac);
2394                         ctxt.meta_ac = NULL;
2395                 }
2396
2397                 if (ret < 0) {
2398                         mlog_errno(ret);
2399                         break;
2400                 }
2401
2402         }
2403
2404         if (ctxt.meta_ac)
2405                 ocfs2_free_alloc_context(ctxt.meta_ac);
2406         ocfs2_schedule_truncate_log_flush(osb, 1);
2407         ocfs2_run_deallocs(osb, &ctxt.dealloc);
2408         return ret;
2409 }
2410
2411 static int ocfs2_xattr_ibody_remove(struct inode *inode,
2412                                     struct buffer_head *di_bh,
2413                                     struct ocfs2_caching_info *ref_ci,
2414                                     struct buffer_head *ref_root_bh)
2415 {
2416
2417         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2418         struct ocfs2_xattr_header *header;
2419         int ret;
2420         struct ocfs2_xattr_value_buf vb = {
2421                 .vb_bh = di_bh,
2422                 .vb_access = ocfs2_journal_access_di,
2423         };
2424
2425         header = (struct ocfs2_xattr_header *)
2426                  ((void *)di + inode->i_sb->s_blocksize -
2427                  le16_to_cpu(di->i_xattr_inline_size));
2428
2429         ret = ocfs2_remove_value_outside(inode, &vb, header,
2430                                          ref_ci, ref_root_bh);
2431
2432         return ret;
2433 }
2434
2435 struct ocfs2_rm_xattr_bucket_para {
2436         struct ocfs2_caching_info *ref_ci;
2437         struct buffer_head *ref_root_bh;
2438 };
2439
2440 static int ocfs2_xattr_block_remove(struct inode *inode,
2441                                     struct buffer_head *blk_bh,
2442                                     struct ocfs2_caching_info *ref_ci,
2443                                     struct buffer_head *ref_root_bh)
2444 {
2445         struct ocfs2_xattr_block *xb;
2446         int ret = 0;
2447         struct ocfs2_xattr_value_buf vb = {
2448                 .vb_bh = blk_bh,
2449                 .vb_access = ocfs2_journal_access_xb,
2450         };
2451         struct ocfs2_rm_xattr_bucket_para args = {
2452                 .ref_ci = ref_ci,
2453                 .ref_root_bh = ref_root_bh,
2454         };
2455
2456         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2457         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2458                 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
2459                 ret = ocfs2_remove_value_outside(inode, &vb, header,
2460                                                  ref_ci, ref_root_bh);
2461         } else
2462                 ret = ocfs2_iterate_xattr_index_block(inode,
2463                                                 blk_bh,
2464                                                 ocfs2_rm_xattr_cluster,
2465                                                 &args);
2466
2467         return ret;
2468 }
2469
2470 static int ocfs2_xattr_free_block(struct inode *inode,
2471                                   u64 block,
2472                                   struct ocfs2_caching_info *ref_ci,
2473                                   struct buffer_head *ref_root_bh)
2474 {
2475         struct inode *xb_alloc_inode;
2476         struct buffer_head *xb_alloc_bh = NULL;
2477         struct buffer_head *blk_bh = NULL;
2478         struct ocfs2_xattr_block *xb;
2479         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2480         handle_t *handle;
2481         int ret = 0;
2482         u64 blk, bg_blkno;
2483         u16 bit;
2484
2485         ret = ocfs2_read_xattr_block(inode, block, &blk_bh);
2486         if (ret < 0) {
2487                 mlog_errno(ret);
2488                 goto out;
2489         }
2490
2491         ret = ocfs2_xattr_block_remove(inode, blk_bh, ref_ci, ref_root_bh);
2492         if (ret < 0) {
2493                 mlog_errno(ret);
2494                 goto out;
2495         }
2496
2497         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2498         blk = le64_to_cpu(xb->xb_blkno);
2499         bit = le16_to_cpu(xb->xb_suballoc_bit);
2500         if (xb->xb_suballoc_loc)
2501                 bg_blkno = le64_to_cpu(xb->xb_suballoc_loc);
2502         else
2503                 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
2504
2505         xb_alloc_inode = ocfs2_get_system_file_inode(osb,
2506                                 EXTENT_ALLOC_SYSTEM_INODE,
2507                                 le16_to_cpu(xb->xb_suballoc_slot));
2508         if (!xb_alloc_inode) {
2509                 ret = -ENOMEM;
2510                 mlog_errno(ret);
2511                 goto out;
2512         }
2513         inode_lock(xb_alloc_inode);
2514
2515         ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
2516         if (ret < 0) {
2517                 mlog_errno(ret);
2518                 goto out_mutex;
2519         }
2520
2521         handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
2522         if (IS_ERR(handle)) {
2523                 ret = PTR_ERR(handle);
2524                 mlog_errno(ret);
2525                 goto out_unlock;
2526         }
2527
2528         ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
2529                                        bit, bg_blkno, 1);
2530         if (ret < 0)
2531                 mlog_errno(ret);
2532
2533         ocfs2_commit_trans(osb, handle);
2534 out_unlock:
2535         ocfs2_inode_unlock(xb_alloc_inode, 1);
2536         brelse(xb_alloc_bh);
2537 out_mutex:
2538         inode_unlock(xb_alloc_inode);
2539         iput(xb_alloc_inode);
2540 out:
2541         brelse(blk_bh);
2542         return ret;
2543 }
2544
2545 /*
2546  * ocfs2_xattr_remove()
2547  *
2548  * Free extended attribute resources associated with this inode.
2549  */
2550 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
2551 {
2552         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2553         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2554         struct ocfs2_refcount_tree *ref_tree = NULL;
2555         struct buffer_head *ref_root_bh = NULL;
2556         struct ocfs2_caching_info *ref_ci = NULL;
2557         handle_t *handle;
2558         int ret;
2559
2560         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2561                 return 0;
2562
2563         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
2564                 return 0;
2565
2566         if (ocfs2_is_refcount_inode(inode)) {
2567                 ret = ocfs2_lock_refcount_tree(OCFS2_SB(inode->i_sb),
2568                                                le64_to_cpu(di->i_refcount_loc),
2569                                                1, &ref_tree, &ref_root_bh);
2570                 if (ret) {
2571                         mlog_errno(ret);
2572                         goto out;
2573                 }
2574                 ref_ci = &ref_tree->rf_ci;
2575
2576         }
2577
2578         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2579                 ret = ocfs2_xattr_ibody_remove(inode, di_bh,
2580                                                ref_ci, ref_root_bh);
2581                 if (ret < 0) {
2582                         mlog_errno(ret);
2583                         goto out;
2584                 }
2585         }
2586
2587         if (di->i_xattr_loc) {
2588                 ret = ocfs2_xattr_free_block(inode,
2589                                              le64_to_cpu(di->i_xattr_loc),
2590                                              ref_ci, ref_root_bh);
2591                 if (ret < 0) {
2592                         mlog_errno(ret);
2593                         goto out;
2594                 }
2595         }
2596
2597         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
2598                                    OCFS2_INODE_UPDATE_CREDITS);
2599         if (IS_ERR(handle)) {
2600                 ret = PTR_ERR(handle);
2601                 mlog_errno(ret);
2602                 goto out;
2603         }
2604         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
2605                                       OCFS2_JOURNAL_ACCESS_WRITE);
2606         if (ret) {
2607                 mlog_errno(ret);
2608                 goto out_commit;
2609         }
2610
2611         di->i_xattr_loc = 0;
2612
2613         spin_lock(&oi->ip_lock);
2614         oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
2615         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
2616         spin_unlock(&oi->ip_lock);
2617         ocfs2_update_inode_fsync_trans(handle, inode, 0);
2618
2619         ocfs2_journal_dirty(handle, di_bh);
2620 out_commit:
2621         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
2622 out:
2623         if (ref_tree)
2624                 ocfs2_unlock_refcount_tree(OCFS2_SB(inode->i_sb), ref_tree, 1);
2625         brelse(ref_root_bh);
2626         return ret;
2627 }
2628
2629 static int ocfs2_xattr_has_space_inline(struct inode *inode,
2630                                         struct ocfs2_dinode *di)
2631 {
2632         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2633         unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
2634         int free;
2635
2636         if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
2637                 return 0;
2638
2639         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2640                 struct ocfs2_inline_data *idata = &di->id2.i_data;
2641                 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
2642         } else if (ocfs2_inode_is_fast_symlink(inode)) {
2643                 free = ocfs2_fast_symlink_chars(inode->i_sb) -
2644                         le64_to_cpu(di->i_size);
2645         } else {
2646                 struct ocfs2_extent_list *el = &di->id2.i_list;
2647                 free = (le16_to_cpu(el->l_count) -
2648                         le16_to_cpu(el->l_next_free_rec)) *
2649                         sizeof(struct ocfs2_extent_rec);
2650         }
2651         if (free >= xattrsize)
2652                 return 1;
2653
2654         return 0;
2655 }
2656
2657 /*
2658  * ocfs2_xattr_ibody_find()
2659  *
2660  * Find extended attribute in inode block and
2661  * fill search info into struct ocfs2_xattr_search.
2662  */
2663 static int ocfs2_xattr_ibody_find(struct inode *inode,
2664                                   int name_index,
2665                                   const char *name,
2666                                   struct ocfs2_xattr_search *xs)
2667 {
2668         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2669         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2670         int ret;
2671         int has_space = 0;
2672
2673         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2674                 return 0;
2675
2676         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2677                 down_read(&oi->ip_alloc_sem);
2678                 has_space = ocfs2_xattr_has_space_inline(inode, di);
2679                 up_read(&oi->ip_alloc_sem);
2680                 if (!has_space)
2681                         return 0;
2682         }
2683
2684         xs->xattr_bh = xs->inode_bh;
2685         xs->end = (void *)di + inode->i_sb->s_blocksize;
2686         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
2687                 xs->header = (struct ocfs2_xattr_header *)
2688                         (xs->end - le16_to_cpu(di->i_xattr_inline_size));
2689         else
2690                 xs->header = (struct ocfs2_xattr_header *)
2691                         (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
2692         xs->base = (void *)xs->header;
2693         xs->here = xs->header->xh_entries;
2694
2695         /* Find the named attribute. */
2696         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2697                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2698                 if (ret && ret != -ENODATA)
2699                         return ret;
2700                 xs->not_found = ret;
2701         }
2702
2703         return 0;
2704 }
2705
2706 static int ocfs2_xattr_ibody_init(struct inode *inode,
2707                                   struct buffer_head *di_bh,
2708                                   struct ocfs2_xattr_set_ctxt *ctxt)
2709 {
2710         int ret;
2711         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2712         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2713         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2714         unsigned int xattrsize = osb->s_xattr_inline_size;
2715
2716         if (!ocfs2_xattr_has_space_inline(inode, di)) {
2717                 ret = -ENOSPC;
2718                 goto out;
2719         }
2720
2721         ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode), di_bh,
2722                                       OCFS2_JOURNAL_ACCESS_WRITE);
2723         if (ret) {
2724                 mlog_errno(ret);
2725                 goto out;
2726         }
2727
2728         /*
2729          * Adjust extent record count or inline data size
2730          * to reserve space for extended attribute.
2731          */
2732         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2733                 struct ocfs2_inline_data *idata = &di->id2.i_data;
2734                 le16_add_cpu(&idata->id_count, -xattrsize);
2735         } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
2736                 struct ocfs2_extent_list *el = &di->id2.i_list;
2737                 le16_add_cpu(&el->l_count, -(xattrsize /
2738                                              sizeof(struct ocfs2_extent_rec)));
2739         }
2740         di->i_xattr_inline_size = cpu_to_le16(xattrsize);
2741
2742         spin_lock(&oi->ip_lock);
2743         oi->ip_dyn_features |= OCFS2_INLINE_XATTR_FL|OCFS2_HAS_XATTR_FL;
2744         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
2745         spin_unlock(&oi->ip_lock);
2746
2747         ocfs2_journal_dirty(ctxt->handle, di_bh);
2748
2749 out:
2750         return ret;
2751 }
2752
2753 /*
2754  * ocfs2_xattr_ibody_set()
2755  *
2756  * Set, replace or remove an extended attribute into inode block.
2757  *
2758  */
2759 static int ocfs2_xattr_ibody_set(struct inode *inode,
2760                                  struct ocfs2_xattr_info *xi,
2761                                  struct ocfs2_xattr_search *xs,
2762                                  struct ocfs2_xattr_set_ctxt *ctxt)
2763 {
2764         int ret;
2765         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2766         struct ocfs2_xa_loc loc;
2767
2768         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2769                 return -ENOSPC;
2770
2771         down_write(&oi->ip_alloc_sem);
2772         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2773                 ret = ocfs2_xattr_ibody_init(inode, xs->inode_bh, ctxt);
2774                 if (ret) {
2775                         if (ret != -ENOSPC)
2776                                 mlog_errno(ret);
2777                         goto out;
2778                 }
2779         }
2780
2781         ocfs2_init_dinode_xa_loc(&loc, inode, xs->inode_bh,
2782                                  xs->not_found ? NULL : xs->here);
2783         ret = ocfs2_xa_set(&loc, xi, ctxt);
2784         if (ret) {
2785                 if (ret != -ENOSPC)
2786                         mlog_errno(ret);
2787                 goto out;
2788         }
2789         xs->here = loc.xl_entry;
2790
2791 out:
2792         up_write(&oi->ip_alloc_sem);
2793
2794         return ret;
2795 }
2796
2797 /*
2798  * ocfs2_xattr_block_find()
2799  *
2800  * Find extended attribute in external block and
2801  * fill search info into struct ocfs2_xattr_search.
2802  */
2803 static int ocfs2_xattr_block_find(struct inode *inode,
2804                                   int name_index,
2805                                   const char *name,
2806                                   struct ocfs2_xattr_search *xs)
2807 {
2808         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2809         struct buffer_head *blk_bh = NULL;
2810         struct ocfs2_xattr_block *xb;
2811         int ret = 0;
2812
2813         if (!di->i_xattr_loc)
2814                 return ret;
2815
2816         ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
2817                                      &blk_bh);
2818         if (ret < 0) {
2819                 mlog_errno(ret);
2820                 return ret;
2821         }
2822
2823         xs->xattr_bh = blk_bh;
2824         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2825
2826         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2827                 xs->header = &xb->xb_attrs.xb_header;
2828                 xs->base = (void *)xs->header;
2829                 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
2830                 xs->here = xs->header->xh_entries;
2831
2832                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2833         } else
2834                 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
2835                                                    name_index,
2836                                                    name, xs);
2837
2838         if (ret && ret != -ENODATA) {
2839                 xs->xattr_bh = NULL;
2840                 goto cleanup;
2841         }
2842         xs->not_found = ret;
2843         return 0;
2844 cleanup:
2845         brelse(blk_bh);
2846
2847         return ret;
2848 }
2849
2850 static int ocfs2_create_xattr_block(struct inode *inode,
2851                                     struct buffer_head *inode_bh,
2852                                     struct ocfs2_xattr_set_ctxt *ctxt,
2853                                     int indexed,
2854                                     struct buffer_head **ret_bh)
2855 {
2856         int ret;
2857         u16 suballoc_bit_start;
2858         u32 num_got;
2859         u64 suballoc_loc, first_blkno;
2860         struct ocfs2_dinode *di =  (struct ocfs2_dinode *)inode_bh->b_data;
2861         struct buffer_head *new_bh = NULL;
2862         struct ocfs2_xattr_block *xblk;
2863
2864         ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
2865                                       inode_bh, OCFS2_JOURNAL_ACCESS_CREATE);
2866         if (ret < 0) {
2867                 mlog_errno(ret);
2868                 goto end;
2869         }
2870
2871         ret = ocfs2_claim_metadata(ctxt->handle, ctxt->meta_ac, 1,
2872                                    &suballoc_loc, &suballoc_bit_start,
2873                                    &num_got, &first_blkno);
2874         if (ret < 0) {
2875                 mlog_errno(ret);
2876                 goto end;
2877         }
2878
2879         new_bh = sb_getblk(inode->i_sb, first_blkno);
2880         if (!new_bh) {
2881                 ret = -ENOMEM;
2882                 mlog_errno(ret);
2883                 goto end;
2884         }
2885
2886         ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), new_bh);
2887
2888         ret = ocfs2_journal_access_xb(ctxt->handle, INODE_CACHE(inode),
2889                                       new_bh,
2890                                       OCFS2_JOURNAL_ACCESS_CREATE);
2891         if (ret < 0) {
2892                 mlog_errno(ret);
2893                 goto end;
2894         }
2895
2896         /* Initialize ocfs2_xattr_block */
2897         xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
2898         memset(xblk, 0, inode->i_sb->s_blocksize);
2899         strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
2900         xblk->xb_suballoc_slot = cpu_to_le16(ctxt->meta_ac->ac_alloc_slot);
2901         xblk->xb_suballoc_loc = cpu_to_le64(suballoc_loc);
2902         xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
2903         xblk->xb_fs_generation =
2904                 cpu_to_le32(OCFS2_SB(inode->i_sb)->fs_generation);
2905         xblk->xb_blkno = cpu_to_le64(first_blkno);
2906         if (indexed) {
2907                 struct ocfs2_xattr_tree_root *xr = &xblk->xb_attrs.xb_root;
2908                 xr->xt_clusters = cpu_to_le32(1);
2909                 xr->xt_last_eb_blk = 0;
2910                 xr->xt_list.l_tree_depth = 0;
2911                 xr->xt_list.l_count = cpu_to_le16(
2912                                         ocfs2_xattr_recs_per_xb(inode->i_sb));
2913                 xr->xt_list.l_next_free_rec = cpu_to_le16(1);
2914                 xblk->xb_flags = cpu_to_le16(OCFS2_XATTR_INDEXED);
2915         }
2916         ocfs2_journal_dirty(ctxt->handle, new_bh);
2917
2918         /* Add it to the inode */
2919         di->i_xattr_loc = cpu_to_le64(first_blkno);
2920
2921         spin_lock(&OCFS2_I(inode)->ip_lock);
2922         OCFS2_I(inode)->ip_dyn_features |= OCFS2_HAS_XATTR_FL;
2923         di->i_dyn_features = cpu_to_le16(OCFS2_I(inode)->ip_dyn_features);
2924         spin_unlock(&OCFS2_I(inode)->ip_lock);
2925
2926         ocfs2_journal_dirty(ctxt->handle, inode_bh);
2927
2928         *ret_bh = new_bh;
2929         new_bh = NULL;
2930
2931 end:
2932         brelse(new_bh);
2933         return ret;
2934 }
2935
2936 /*
2937  * ocfs2_xattr_block_set()
2938  *
2939  * Set, replace or remove an extended attribute into external block.
2940  *
2941  */
2942 static int ocfs2_xattr_block_set(struct inode *inode,
2943                                  struct ocfs2_xattr_info *xi,
2944                                  struct ocfs2_xattr_search *xs,
2945                                  struct ocfs2_xattr_set_ctxt *ctxt)
2946 {
2947         struct buffer_head *new_bh = NULL;
2948         struct ocfs2_xattr_block *xblk = NULL;
2949         int ret;
2950         struct ocfs2_xa_loc loc;
2951
2952         if (!xs->xattr_bh) {
2953                 ret = ocfs2_create_xattr_block(inode, xs->inode_bh, ctxt,
2954                                                0, &new_bh);
2955                 if (ret) {
2956                         mlog_errno(ret);
2957                         goto end;
2958                 }
2959
2960                 xs->xattr_bh = new_bh;
2961                 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2962                 xs->header = &xblk->xb_attrs.xb_header;
2963                 xs->base = (void *)xs->header;
2964                 xs->end = (void *)xblk + inode->i_sb->s_blocksize;
2965                 xs->here = xs->header->xh_entries;
2966         } else
2967                 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2968
2969         if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
2970                 ocfs2_init_xattr_block_xa_loc(&loc, inode, xs->xattr_bh,
2971                                               xs->not_found ? NULL : xs->here);
2972
2973                 ret = ocfs2_xa_set(&loc, xi, ctxt);
2974                 if (!ret)
2975                         xs->here = loc.xl_entry;
2976                 else if ((ret != -ENOSPC) || ctxt->set_abort)
2977                         goto end;
2978                 else {
2979                         ret = ocfs2_xattr_create_index_block(inode, xs, ctxt);
2980                         if (ret)
2981                                 goto end;
2982                 }
2983         }
2984
2985         if (le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)
2986                 ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs, ctxt);
2987
2988 end:
2989         return ret;
2990 }
2991
2992 /* Check whether the new xattr can be inserted into the inode. */
2993 static int ocfs2_xattr_can_be_in_inode(struct inode *inode,
2994                                        struct ocfs2_xattr_info *xi,
2995                                        struct ocfs2_xattr_search *xs)
2996 {
2997         struct ocfs2_xattr_entry *last;
2998         int free, i;
2999         size_t min_offs = xs->end - xs->base;
3000
3001         if (!xs->header)
3002                 return 0;
3003
3004         last = xs->header->xh_entries;
3005
3006         for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
3007                 size_t offs = le16_to_cpu(last->xe_name_offset);
3008                 if (offs < min_offs)
3009                         min_offs = offs;
3010                 last += 1;
3011         }
3012
3013         free = min_offs - ((void *)last - xs->base) - OCFS2_XATTR_HEADER_GAP;
3014         if (free < 0)
3015                 return 0;
3016
3017         BUG_ON(!xs->not_found);
3018
3019         if (free >= (sizeof(struct ocfs2_xattr_entry) + namevalue_size_xi(xi)))
3020                 return 1;
3021
3022         return 0;
3023 }
3024
3025 static int ocfs2_calc_xattr_set_need(struct inode *inode,
3026                                      struct ocfs2_dinode *di,
3027                                      struct ocfs2_xattr_info *xi,
3028                                      struct ocfs2_xattr_search *xis,
3029                                      struct ocfs2_xattr_search *xbs,
3030                                      int *clusters_need,
3031                                      int *meta_need,
3032                                      int *credits_need)
3033 {
3034         int ret = 0, old_in_xb = 0;
3035         int clusters_add = 0, meta_add = 0, credits = 0;
3036         struct buffer_head *bh = NULL;
3037         struct ocfs2_xattr_block *xb = NULL;
3038         struct ocfs2_xattr_entry *xe = NULL;
3039         struct ocfs2_xattr_value_root *xv = NULL;
3040         char *base = NULL;
3041         int name_offset, name_len = 0;
3042         u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
3043                                                     xi->xi_value_len);
3044         u64 value_size;
3045
3046         /*
3047          * Calculate the clusters we need to write.
3048          * No matter whether we replace an old one or add a new one,
3049          * we need this for writing.
3050          */
3051         if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE)
3052                 credits += new_clusters *
3053                            ocfs2_clusters_to_blocks(inode->i_sb, 1);
3054
3055         if (xis->not_found && xbs->not_found) {
3056                 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3057
3058                 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3059                         clusters_add += new_clusters;
3060                         credits += ocfs2_calc_extend_credits(inode->i_sb,
3061                                                         &def_xv.xv.xr_list);
3062                 }
3063
3064                 goto meta_guess;
3065         }
3066
3067         if (!xis->not_found) {
3068                 xe = xis->here;
3069                 name_offset = le16_to_cpu(xe->xe_name_offset);
3070                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3071                 base = xis->base;
3072                 credits += OCFS2_INODE_UPDATE_CREDITS;
3073         } else {
3074                 int i, block_off = 0;
3075                 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
3076                 xe = xbs->here;
3077                 name_offset = le16_to_cpu(xe->xe_name_offset);
3078                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3079                 i = xbs->here - xbs->header->xh_entries;
3080                 old_in_xb = 1;
3081
3082                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
3083                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3084                                                         bucket_xh(xbs->bucket),
3085                                                         i, &block_off,
3086                                                         &name_offset);
3087                         base = bucket_block(xbs->bucket, block_off);
3088                         credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3089                 } else {
3090                         base = xbs->base;
3091                         credits += OCFS2_XATTR_BLOCK_UPDATE_CREDITS;
3092                 }
3093         }
3094
3095         /*
3096          * delete a xattr doesn't need metadata and cluster allocation.
3097          * so just calculate the credits and return.
3098          *
3099          * The credits for removing the value tree will be extended
3100          * by ocfs2_remove_extent itself.
3101          */
3102         if (!xi->xi_value) {
3103                 if (!ocfs2_xattr_is_local(xe))
3104                         credits += ocfs2_remove_extent_credits(inode->i_sb);
3105
3106                 goto out;
3107         }
3108
3109         /* do cluster allocation guess first. */
3110         value_size = le64_to_cpu(xe->xe_value_size);
3111
3112         if (old_in_xb) {
3113                 /*
3114                  * In xattr set, we always try to set the xe in inode first,
3115                  * so if it can be inserted into inode successfully, the old
3116                  * one will be removed from the xattr block, and this xattr
3117                  * will be inserted into inode as a new xattr in inode.
3118                  */
3119                 if (ocfs2_xattr_can_be_in_inode(inode, xi, xis)) {
3120                         clusters_add += new_clusters;
3121                         credits += ocfs2_remove_extent_credits(inode->i_sb) +
3122                                     OCFS2_INODE_UPDATE_CREDITS;
3123                         if (!ocfs2_xattr_is_local(xe))
3124                                 credits += ocfs2_calc_extend_credits(
3125                                                         inode->i_sb,
3126                                                         &def_xv.xv.xr_list);
3127                         goto out;
3128                 }
3129         }
3130
3131         if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3132                 /* the new values will be stored outside. */
3133                 u32 old_clusters = 0;
3134
3135                 if (!ocfs2_xattr_is_local(xe)) {
3136                         old_clusters =  ocfs2_clusters_for_bytes(inode->i_sb,
3137                                                                  value_size);
3138                         xv = (struct ocfs2_xattr_value_root *)
3139                              (base + name_offset + name_len);
3140                         value_size = OCFS2_XATTR_ROOT_SIZE;
3141                 } else
3142                         xv = &def_xv.xv;
3143
3144                 if (old_clusters >= new_clusters) {
3145                         credits += ocfs2_remove_extent_credits(inode->i_sb);
3146                         goto out;
3147                 } else {
3148                         meta_add += ocfs2_extend_meta_needed(&xv->xr_list);
3149                         clusters_add += new_clusters - old_clusters;
3150                         credits += ocfs2_calc_extend_credits(inode->i_sb,
3151                                                              &xv->xr_list);
3152                         if (value_size >= OCFS2_XATTR_ROOT_SIZE)
3153                                 goto out;
3154                 }
3155         } else {
3156                 /*
3157                  * Now the new value will be stored inside. So if the new
3158                  * value is smaller than the size of value root or the old
3159                  * value, we don't need any allocation, otherwise we have
3160                  * to guess metadata allocation.
3161                  */
3162                 if ((ocfs2_xattr_is_local(xe) &&
3163                      (value_size >= xi->xi_value_len)) ||
3164                     (!ocfs2_xattr_is_local(xe) &&
3165                      OCFS2_XATTR_ROOT_SIZE >= xi->xi_value_len))
3166                         goto out;
3167         }
3168
3169 meta_guess:
3170         /* calculate metadata allocation. */
3171         if (di->i_xattr_loc) {
3172                 if (!xbs->xattr_bh) {
3173                         ret = ocfs2_read_xattr_block(inode,
3174                                                      le64_to_cpu(di->i_xattr_loc),
3175                                                      &bh);
3176                         if (ret) {
3177                                 mlog_errno(ret);
3178                                 goto out;
3179                         }
3180
3181                         xb = (struct ocfs2_xattr_block *)bh->b_data;
3182                 } else
3183                         xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
3184
3185                 /*
3186                  * If there is already an xattr tree, good, we can calculate
3187                  * like other b-trees. Otherwise we may have the chance of
3188                  * create a tree, the credit calculation is borrowed from
3189                  * ocfs2_calc_extend_credits with root_el = NULL. And the
3190                  * new tree will be cluster based, so no meta is needed.
3191                  */
3192                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
3193                         struct ocfs2_extent_list *el =
3194                                  &xb->xb_attrs.xb_root.xt_list;
3195                         meta_add += ocfs2_extend_meta_needed(el);
3196                         credits += ocfs2_calc_extend_credits(inode->i_sb,
3197                                                              el);
3198                 } else
3199                         credits += OCFS2_SUBALLOC_ALLOC + 1;
3200
3201                 /*
3202                  * This cluster will be used either for new bucket or for
3203                  * new xattr block.
3204                  * If the cluster size is the same as the bucket size, one
3205                  * more is needed since we may need to extend the bucket
3206                  * also.
3207                  */
3208                 clusters_add += 1;
3209                 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3210                 if (OCFS2_XATTR_BUCKET_SIZE ==
3211                         OCFS2_SB(inode->i_sb)->s_clustersize) {
3212                         credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3213                         clusters_add += 1;
3214                 }
3215         } else {
3216                 credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
3217                 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3218                         struct ocfs2_extent_list *el = &def_xv.xv.xr_list;
3219                         meta_add += ocfs2_extend_meta_needed(el);
3220                         credits += ocfs2_calc_extend_credits(inode->i_sb,
3221                                                              el);
3222                 } else {
3223                         meta_add += 1;
3224                 }
3225         }
3226 out:
3227         if (clusters_need)
3228                 *clusters_need = clusters_add;
3229         if (meta_need)
3230                 *meta_need = meta_add;
3231         if (credits_need)
3232                 *credits_need = credits;
3233         brelse(bh);
3234         return ret;
3235 }
3236
3237 static int ocfs2_init_xattr_set_ctxt(struct inode *inode,
3238                                      struct ocfs2_dinode *di,
3239                                      struct ocfs2_xattr_info *xi,
3240                                      struct ocfs2_xattr_search *xis,
3241                                      struct ocfs2_xattr_search *xbs,
3242                                      struct ocfs2_xattr_set_ctxt *ctxt,
3243                                      int extra_meta,
3244                                      int *credits)
3245 {
3246         int clusters_add, meta_add, ret;
3247         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3248
3249         memset(ctxt, 0, sizeof(struct ocfs2_xattr_set_ctxt));
3250
3251         ocfs2_init_dealloc_ctxt(&ctxt->dealloc);
3252
3253         ret = ocfs2_calc_xattr_set_need(inode, di, xi, xis, xbs,
3254                                         &clusters_add, &meta_add, credits);
3255         if (ret) {
3256                 mlog_errno(ret);
3257                 return ret;
3258         }
3259
3260         meta_add += extra_meta;
3261         trace_ocfs2_init_xattr_set_ctxt(xi->xi_name, meta_add,
3262                                         clusters_add, *credits);
3263
3264         if (meta_add) {
3265                 ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add,
3266                                                         &ctxt->meta_ac);
3267                 if (ret) {
3268                         mlog_errno(ret);
3269                         goto out;
3270                 }
3271         }
3272
3273         if (clusters_add) {
3274                 ret = ocfs2_reserve_clusters(osb, clusters_add, &ctxt->data_ac);
3275                 if (ret)
3276                         mlog_errno(ret);
3277         }
3278 out:
3279         if (ret) {
3280                 if (ctxt->meta_ac) {
3281                         ocfs2_free_alloc_context(ctxt->meta_ac);
3282                         ctxt->meta_ac = NULL;
3283                 }
3284
3285                 /*
3286                  * We cannot have an error and a non null ctxt->data_ac.
3287                  */
3288         }
3289
3290         return ret;
3291 }
3292
3293 static int __ocfs2_xattr_set_handle(struct inode *inode,
3294                                     struct ocfs2_dinode *di,
3295                                     struct ocfs2_xattr_info *xi,
3296                                     struct ocfs2_xattr_search *xis,
3297                                     struct ocfs2_xattr_search *xbs,
3298                                     struct ocfs2_xattr_set_ctxt *ctxt)
3299 {
3300         int ret = 0, credits, old_found;
3301
3302         if (!xi->xi_value) {
3303                 /* Remove existing extended attribute */
3304                 if (!xis->not_found)
3305                         ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
3306                 else if (!xbs->not_found)
3307                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3308         } else {
3309                 /* We always try to set extended attribute into inode first*/
3310                 ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
3311                 if (!ret && !xbs->not_found) {
3312                         /*
3313                          * If succeed and that extended attribute existing in
3314                          * external block, then we will remove it.
3315                          */
3316                         xi->xi_value = NULL;
3317                         xi->xi_value_len = 0;
3318
3319                         old_found = xis->not_found;
3320                         xis->not_found = -ENODATA;
3321                         ret = ocfs2_calc_xattr_set_need(inode,
3322                                                         di,
3323                                                         xi,
3324                                                         xis,
3325                                                         xbs,
3326                                                         NULL,
3327                                                         NULL,
3328                                                         &credits);
3329                         xis->not_found = old_found;
3330                         if (ret) {
3331                                 mlog_errno(ret);
3332                                 goto out;
3333                         }
3334
3335                         ret = ocfs2_extend_trans(ctxt->handle, credits);
3336                         if (ret) {
3337                                 mlog_errno(ret);
3338                                 goto out;
3339                         }
3340                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3341                 } else if ((ret == -ENOSPC) && !ctxt->set_abort) {
3342                         if (di->i_xattr_loc && !xbs->xattr_bh) {
3343                                 ret = ocfs2_xattr_block_find(inode,
3344                                                              xi->xi_name_index,
3345                                                              xi->xi_name, xbs);
3346                                 if (ret)
3347                                         goto out;
3348
3349                                 old_found = xis->not_found;
3350                                 xis->not_found = -ENODATA;
3351                                 ret = ocfs2_calc_xattr_set_need(inode,
3352                                                                 di,
3353                                                                 xi,
3354                                                                 xis,
3355                                                                 xbs,
3356                                                                 NULL,
3357                                                                 NULL,
3358                                                                 &credits);
3359                                 xis->not_found = old_found;
3360                                 if (ret) {
3361                                         mlog_errno(ret);
3362                                         goto out;
3363                                 }
3364
3365                                 ret = ocfs2_extend_trans(ctxt->handle, credits);
3366                                 if (ret) {
3367                                         mlog_errno(ret);
3368                                         goto out;
3369                                 }
3370                         }
3371                         /*
3372                          * If no space in inode, we will set extended attribute
3373                          * into external block.
3374                          */
3375                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3376                         if (ret)
3377                                 goto out;
3378                         if (!xis->not_found) {
3379                                 /*
3380                                  * If succeed and that extended attribute
3381                                  * existing in inode, we will remove it.
3382                                  */
3383                                 xi->xi_value = NULL;
3384                                 xi->xi_value_len = 0;
3385                                 xbs->not_found = -ENODATA;
3386                                 ret = ocfs2_calc_xattr_set_need(inode,
3387                                                                 di,
3388                                                                 xi,
3389                                                                 xis,
3390                                                                 xbs,
3391                                                                 NULL,
3392                                                                 NULL,
3393                                                                 &credits);
3394                                 if (ret) {
3395                                         mlog_errno(ret);
3396                                         goto out;
3397                                 }
3398
3399                                 ret = ocfs2_extend_trans(ctxt->handle, credits);
3400                                 if (ret) {
3401                                         mlog_errno(ret);
3402                                         goto out;
3403                                 }
3404                                 ret = ocfs2_xattr_ibody_set(inode, xi,
3405                                                             xis, ctxt);
3406                         }
3407                 }
3408         }
3409
3410         if (!ret) {
3411                 /* Update inode ctime. */
3412                 ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
3413                                               xis->inode_bh,
3414                                               OCFS2_JOURNAL_ACCESS_WRITE);
3415                 if (ret) {
3416                         mlog_errno(ret);
3417                         goto out;
3418                 }
3419
3420                 inode->i_ctime = current_time(inode);
3421                 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
3422                 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
3423                 ocfs2_journal_dirty(ctxt->handle, xis->inode_bh);
3424         }
3425 out:
3426         return ret;
3427 }
3428
3429 /*
3430  * This function only called duing creating inode
3431  * for init security/acl xattrs of the new inode.
3432  * All transanction credits have been reserved in mknod.
3433  */
3434 int ocfs2_xattr_set_handle(handle_t *handle,
3435                            struct inode *inode,
3436                            struct buffer_head *di_bh,
3437                            int name_index,
3438                            const char *name,
3439                            const void *value,
3440                            size_t value_len,
3441                            int flags,
3442                            struct ocfs2_alloc_context *meta_ac,
3443                            struct ocfs2_alloc_context *data_ac)
3444 {
3445         struct ocfs2_dinode *di;
3446         int ret;
3447
3448         struct ocfs2_xattr_info xi = {
3449                 .xi_name_index = name_index,
3450                 .xi_name = name,
3451                 .xi_name_len = strlen(name),
3452                 .xi_value = value,
3453                 .xi_value_len = value_len,
3454         };
3455
3456         struct ocfs2_xattr_search xis = {
3457                 .not_found = -ENODATA,
3458         };
3459
3460         struct ocfs2_xattr_search xbs = {
3461                 .not_found = -ENODATA,
3462         };
3463
3464         struct ocfs2_xattr_set_ctxt ctxt = {
3465                 .handle = handle,
3466                 .meta_ac = meta_ac,
3467                 .data_ac = data_ac,
3468         };
3469
3470         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
3471                 return -EOPNOTSUPP;
3472
3473         /*
3474          * In extreme situation, may need xattr bucket when
3475          * block size is too small. And we have already reserved
3476          * the credits for bucket in mknod.
3477          */
3478         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) {
3479                 xbs.bucket = ocfs2_xattr_bucket_new(inode);
3480                 if (!xbs.bucket) {
3481                         mlog_errno(-ENOMEM);
3482                         return -ENOMEM;
3483                 }
3484         }
3485
3486         xis.inode_bh = xbs.inode_bh = di_bh;
3487         di = (struct ocfs2_dinode *)di_bh->b_data;
3488
3489         down_write(&OCFS2_I(inode)->ip_xattr_sem);
3490
3491         ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
3492         if (ret)
3493                 goto cleanup;
3494         if (xis.not_found) {
3495                 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
3496                 if (ret)
3497                         goto cleanup;
3498         }
3499
3500         ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
3501
3502 cleanup:
3503         up_write(&OCFS2_I(inode)->ip_xattr_sem);
3504         brelse(xbs.xattr_bh);
3505         ocfs2_xattr_bucket_free(xbs.bucket);
3506
3507         return ret;
3508 }
3509
3510 /*
3511  * ocfs2_xattr_set()
3512  *
3513  * Set, replace or remove an extended attribute for this inode.
3514  * value is NULL to remove an existing extended attribute, else either
3515  * create or replace an extended attribute.
3516  */
3517 int ocfs2_xattr_set(struct inode *inode,
3518                     int name_index,
3519                     const char *name,
3520                     const void *value,
3521                     size_t value_len,
3522                     int flags)
3523 {
3524         struct buffer_head *di_bh = NULL;
3525         struct ocfs2_dinode *di;
3526         int ret, credits, had_lock, ref_meta = 0, ref_credits = 0;
3527         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3528         struct inode *tl_inode = osb->osb_tl_inode;
3529         struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, NULL, };
3530         struct ocfs2_refcount_tree *ref_tree = NULL;
3531         struct ocfs2_lock_holder oh;
3532
3533         struct ocfs2_xattr_info xi = {
3534                 .xi_name_index = name_index,
3535                 .xi_name = name,
3536                 .xi_name_len = strlen(name),
3537                 .xi_value = value,
3538                 .xi_value_len = value_len,
3539         };
3540
3541         struct ocfs2_xattr_search xis = {
3542                 .not_found = -ENODATA,
3543         };
3544
3545         struct ocfs2_xattr_search xbs = {
3546                 .not_found = -ENODATA,
3547         };
3548
3549         if (!ocfs2_supports_xattr(osb))
3550                 return -EOPNOTSUPP;
3551
3552         /*
3553          * Only xbs will be used on indexed trees.  xis doesn't need a
3554          * bucket.
3555          */
3556         xbs.bucket = ocfs2_xattr_bucket_new(inode);
3557         if (!xbs.bucket) {
3558                 mlog_errno(-ENOMEM);
3559                 return -ENOMEM;
3560         }
3561
3562         had_lock = ocfs2_inode_lock_tracker(inode, &di_bh, 1, &oh);
3563         if (had_lock < 0) {
3564                 ret = had_lock;
3565                 mlog_errno(ret);
3566                 goto cleanup_nolock;
3567         }
3568         xis.inode_bh = xbs.inode_bh = di_bh;
3569         di = (struct ocfs2_dinode *)di_bh->b_data;
3570
3571         down_write(&OCFS2_I(inode)->ip_xattr_sem);
3572         /*
3573          * Scan inode and external block to find the same name
3574          * extended attribute and collect search information.
3575          */
3576         ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
3577         if (ret)
3578                 goto cleanup;
3579         if (xis.not_found) {
3580                 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
3581                 if (ret)
3582                         goto cleanup;
3583         }
3584
3585         if (xis.not_found && xbs.not_found) {
3586                 ret = -ENODATA;
3587                 if (flags & XATTR_REPLACE)
3588                         goto cleanup;
3589                 ret = 0;
3590                 if (!value)
3591                         goto cleanup;
3592         } else {
3593                 ret = -EEXIST;
3594                 if (flags & XATTR_CREATE)
3595                         goto cleanup;
3596         }
3597
3598         /* Check whether the value is refcounted and do some preparation. */
3599         if (ocfs2_is_refcount_inode(inode) &&
3600             (!xis.not_found || !xbs.not_found)) {
3601                 ret = ocfs2_prepare_refcount_xattr(inode, di, &xi,
3602                                                    &xis, &xbs, &ref_tree,
3603                                                    &ref_meta, &ref_credits);
3604                 if (ret) {
3605                         mlog_errno(ret);
3606                         goto cleanup;
3607                 }
3608         }
3609
3610         inode_lock(tl_inode);
3611
3612         if (ocfs2_truncate_log_needs_flush(osb)) {
3613                 ret = __ocfs2_flush_truncate_log(osb);
3614                 if (ret < 0) {
3615                         inode_unlock(tl_inode);
3616                         mlog_errno(ret);
3617                         goto cleanup;
3618                 }
3619         }
3620         inode_unlock(tl_inode);
3621
3622         ret = ocfs2_init_xattr_set_ctxt(inode, di, &xi, &xis,
3623                                         &xbs, &ctxt, ref_meta, &credits);
3624         if (ret) {
3625                 mlog_errno(ret);
3626                 goto cleanup;
3627         }
3628
3629         /* we need to update inode's ctime field, so add credit for it. */
3630         credits += OCFS2_INODE_UPDATE_CREDITS;
3631         ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
3632         if (IS_ERR(ctxt.handle)) {
3633                 ret = PTR_ERR(ctxt.handle);
3634                 mlog_errno(ret);
3635                 goto out_free_ac;
3636         }
3637
3638         ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
3639         ocfs2_update_inode_fsync_trans(ctxt.handle, inode, 0);
3640
3641         ocfs2_commit_trans(osb, ctxt.handle);
3642
3643 out_free_ac:
3644         if (ctxt.data_ac)
3645                 ocfs2_free_alloc_context(ctxt.data_ac);
3646         if (ctxt.meta_ac)
3647                 ocfs2_free_alloc_context(ctxt.meta_ac);
3648         if (ocfs2_dealloc_has_cluster(&ctxt.dealloc))
3649                 ocfs2_schedule_truncate_log_flush(osb, 1);
3650         ocfs2_run_deallocs(osb, &ctxt.dealloc);
3651
3652 cleanup:
3653         if (ref_tree)
3654                 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3655         up_write(&OCFS2_I(inode)->ip_xattr_sem);
3656         if (!value && !ret) {
3657                 ret = ocfs2_try_remove_refcount_tree(inode, di_bh);
3658                 if (ret)
3659                         mlog_errno(ret);
3660         }
3661         ocfs2_inode_unlock_tracker(inode, 1, &oh, had_lock);
3662 cleanup_nolock:
3663         brelse(di_bh);
3664         brelse(xbs.xattr_bh);
3665         ocfs2_xattr_bucket_free(xbs.bucket);
3666
3667         return ret;
3668 }
3669
3670 /*
3671  * Find the xattr extent rec which may contains name_hash.
3672  * e_cpos will be the first name hash of the xattr rec.
3673  * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
3674  */
3675 static int ocfs2_xattr_get_rec(struct inode *inode,
3676                                u32 name_hash,
3677                                u64 *p_blkno,
3678                                u32 *e_cpos,
3679                                u32 *num_clusters,
3680                                struct ocfs2_extent_list *el)
3681 {
3682         int ret = 0, i;
3683         struct buffer_head *eb_bh = NULL;
3684         struct ocfs2_extent_block *eb;
3685         struct ocfs2_extent_rec *rec = NULL;
3686         u64 e_blkno = 0;
3687
3688         if (el->l_tree_depth) {
3689                 ret = ocfs2_find_leaf(INODE_CACHE(inode), el, name_hash,
3690                                       &eb_bh);
3691                 if (ret) {
3692                         mlog_errno(ret);
3693                         goto out;
3694                 }
3695
3696                 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
3697                 el = &eb->h_list;
3698
3699                 if (el->l_tree_depth) {
3700                         ret = ocfs2_error(inode->i_sb,
3701                                           "Inode %lu has non zero tree depth in xattr tree block %llu\n",
3702                                           inode->i_ino,
3703                                           (unsigned long long)eb_bh->b_blocknr);
3704                         goto out;
3705                 }
3706         }
3707
3708         for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
3709                 rec = &el->l_recs[i];
3710
3711                 if (le32_to_cpu(rec->e_cpos) <= name_hash) {
3712                         e_blkno = le64_to_cpu(rec->e_blkno);
3713                         break;
3714                 }
3715         }
3716
3717         if (!e_blkno) {
3718                 ret = ocfs2_error(inode->i_sb, "Inode %lu has bad extent record (%u, %u, 0) in xattr\n",
3719                                   inode->i_ino,
3720                                   le32_to_cpu(rec->e_cpos),
3721                                   ocfs2_rec_clusters(el, rec));
3722                 goto out;
3723         }
3724
3725         *p_blkno = le64_to_cpu(rec->e_blkno);
3726         *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
3727         if (e_cpos)
3728                 *e_cpos = le32_to_cpu(rec->e_cpos);
3729 out:
3730         brelse(eb_bh);
3731         return ret;
3732 }
3733
3734 typedef int (xattr_bucket_func)(struct inode *inode,
3735                                 struct ocfs2_xattr_bucket *bucket,
3736                                 void *para);
3737
3738 static int ocfs2_find_xe_in_bucket(struct inode *inode,
3739                                    struct ocfs2_xattr_bucket *bucket,
3740                                    int name_index,
3741                                    const char *name,
3742                                    u32 name_hash,
3743                                    u16 *xe_index,
3744                                    int *found)
3745 {
3746         int i, ret = 0, cmp = 1, block_off, new_offset;
3747         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
3748         size_t name_len = strlen(name);
3749         struct ocfs2_xattr_entry *xe = NULL;
3750         char *xe_name;
3751
3752         /*
3753          * We don't use binary search in the bucket because there
3754          * may be multiple entries with the same name hash.
3755          */
3756         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3757                 xe = &xh->xh_entries[i];
3758
3759                 if (name_hash > le32_to_cpu(xe->xe_name_hash))
3760                         continue;
3761                 else if (name_hash < le32_to_cpu(xe->xe_name_hash))
3762                         break;
3763
3764                 cmp = name_index - ocfs2_xattr_get_type(xe);
3765                 if (!cmp)
3766                         cmp = name_len - xe->xe_name_len;
3767                 if (cmp)
3768                         continue;
3769
3770                 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3771                                                         xh,
3772                                                         i,
3773                                                         &block_off,
3774                                                         &new_offset);
3775                 if (ret) {
3776                         mlog_errno(ret);
3777                         break;
3778                 }
3779
3780
3781                 xe_name = bucket_block(bucket, block_off) + new_offset;
3782                 if (!memcmp(name, xe_name, name_len)) {
3783                         *xe_index = i;
3784                         *found = 1;
3785                         ret = 0;
3786                         break;
3787                 }
3788         }
3789
3790         return ret;
3791 }
3792
3793 /*
3794  * Find the specified xattr entry in a series of buckets.
3795  * This series start from p_blkno and last for num_clusters.
3796  * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
3797  * the num of the valid buckets.
3798  *
3799  * Return the buffer_head this xattr should reside in. And if the xattr's
3800  * hash is in the gap of 2 buckets, return the lower bucket.
3801  */
3802 static int ocfs2_xattr_bucket_find(struct inode *inode,
3803                                    int name_index,
3804                                    const char *name,
3805                                    u32 name_hash,
3806                                    u64 p_blkno,
3807             &nbs