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[linux-3.10.git] / fs / ocfs2 / xattr.c
1 /* -*- mode: c; c-basic-offset: 8; -*-
2  * vim: noexpandtab sw=8 ts=8 sts=0:
3  *
4  * xattr.c
5  *
6  * Copyright (C) 2004, 2008 Oracle.  All rights reserved.
7  *
8  * CREDITS:
9  * Lots of code in this file is copy from linux/fs/ext3/xattr.c.
10  * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
11  *
12  * This program is free software; you can redistribute it and/or
13  * modify it under the terms of the GNU General Public
14  * License version 2 as published by the Free Software Foundation.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
19  * General Public License for more details.
20  */
21
22 #include <linux/capability.h>
23 #include <linux/fs.h>
24 #include <linux/types.h>
25 #include <linux/slab.h>
26 #include <linux/highmem.h>
27 #include <linux/pagemap.h>
28 #include <linux/uio.h>
29 #include <linux/sched.h>
30 #include <linux/splice.h>
31 #include <linux/mount.h>
32 #include <linux/writeback.h>
33 #include <linux/falloc.h>
34 #include <linux/sort.h>
35 #include <linux/init.h>
36 #include <linux/module.h>
37 #include <linux/string.h>
38 #include <linux/security.h>
39
40 #include <cluster/masklog.h>
41
42 #include "ocfs2.h"
43 #include "alloc.h"
44 #include "blockcheck.h"
45 #include "dlmglue.h"
46 #include "file.h"
47 #include "symlink.h"
48 #include "sysfile.h"
49 #include "inode.h"
50 #include "journal.h"
51 #include "ocfs2_fs.h"
52 #include "suballoc.h"
53 #include "uptodate.h"
54 #include "buffer_head_io.h"
55 #include "super.h"
56 #include "xattr.h"
57 #include "refcounttree.h"
58 #include "acl.h"
59 #include "ocfs2_trace.h"
60
61 struct ocfs2_xattr_def_value_root {
62         struct ocfs2_xattr_value_root   xv;
63         struct ocfs2_extent_rec         er;
64 };
65
66 struct ocfs2_xattr_bucket {
67         /* The inode these xattrs are associated with */
68         struct inode *bu_inode;
69
70         /* The actual buffers that make up the bucket */
71         struct buffer_head *bu_bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET];
72
73         /* How many blocks make up one bucket for this filesystem */
74         int bu_blocks;
75 };
76
77 struct ocfs2_xattr_set_ctxt {
78         handle_t *handle;
79         struct ocfs2_alloc_context *meta_ac;
80         struct ocfs2_alloc_context *data_ac;
81         struct ocfs2_cached_dealloc_ctxt dealloc;
82         int set_abort;
83 };
84
85 #define OCFS2_XATTR_ROOT_SIZE   (sizeof(struct ocfs2_xattr_def_value_root))
86 #define OCFS2_XATTR_INLINE_SIZE 80
87 #define OCFS2_XATTR_HEADER_GAP  4
88 #define OCFS2_XATTR_FREE_IN_IBODY       (OCFS2_MIN_XATTR_INLINE_SIZE \
89                                          - sizeof(struct ocfs2_xattr_header) \
90                                          - OCFS2_XATTR_HEADER_GAP)
91 #define OCFS2_XATTR_FREE_IN_BLOCK(ptr)  ((ptr)->i_sb->s_blocksize \
92                                          - sizeof(struct ocfs2_xattr_block) \
93                                          - sizeof(struct ocfs2_xattr_header) \
94                                          - OCFS2_XATTR_HEADER_GAP)
95
96 static struct ocfs2_xattr_def_value_root def_xv = {
97         .xv.xr_list.l_count = cpu_to_le16(1),
98 };
99
100 const struct xattr_handler *ocfs2_xattr_handlers[] = {
101         &ocfs2_xattr_user_handler,
102         &ocfs2_xattr_acl_access_handler,
103         &ocfs2_xattr_acl_default_handler,
104         &ocfs2_xattr_trusted_handler,
105         &ocfs2_xattr_security_handler,
106         NULL
107 };
108
109 static const struct xattr_handler *ocfs2_xattr_handler_map[OCFS2_XATTR_MAX] = {
110         [OCFS2_XATTR_INDEX_USER]        = &ocfs2_xattr_user_handler,
111         [OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS]
112                                         = &ocfs2_xattr_acl_access_handler,
113         [OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT]
114                                         = &ocfs2_xattr_acl_default_handler,
115         [OCFS2_XATTR_INDEX_TRUSTED]     = &ocfs2_xattr_trusted_handler,
116         [OCFS2_XATTR_INDEX_SECURITY]    = &ocfs2_xattr_security_handler,
117 };
118
119 struct ocfs2_xattr_info {
120         int             xi_name_index;
121         const char      *xi_name;
122         int             xi_name_len;
123         const void      *xi_value;
124         size_t          xi_value_len;
125 };
126
127 struct ocfs2_xattr_search {
128         struct buffer_head *inode_bh;
129         /*
130          * xattr_bh point to the block buffer head which has extended attribute
131          * when extended attribute in inode, xattr_bh is equal to inode_bh.
132          */
133         struct buffer_head *xattr_bh;
134         struct ocfs2_xattr_header *header;
135         struct ocfs2_xattr_bucket *bucket;
136         void *base;
137         void *end;
138         struct ocfs2_xattr_entry *here;
139         int not_found;
140 };
141
142 /* Operations on struct ocfs2_xa_entry */
143 struct ocfs2_xa_loc;
144 struct ocfs2_xa_loc_operations {
145         /*
146          * Journal functions
147          */
148         int (*xlo_journal_access)(handle_t *handle, struct ocfs2_xa_loc *loc,
149                                   int type);
150         void (*xlo_journal_dirty)(handle_t *handle, struct ocfs2_xa_loc *loc);
151
152         /*
153          * Return a pointer to the appropriate buffer in loc->xl_storage
154          * at the given offset from loc->xl_header.
155          */
156         void *(*xlo_offset_pointer)(struct ocfs2_xa_loc *loc, int offset);
157
158         /* Can we reuse the existing entry for the new value? */
159         int (*xlo_can_reuse)(struct ocfs2_xa_loc *loc,
160                              struct ocfs2_xattr_info *xi);
161
162         /* How much space is needed for the new value? */
163         int (*xlo_check_space)(struct ocfs2_xa_loc *loc,
164                                struct ocfs2_xattr_info *xi);
165
166         /*
167          * Return the offset of the first name+value pair.  This is
168          * the start of our downward-filling free space.
169          */
170         int (*xlo_get_free_start)(struct ocfs2_xa_loc *loc);
171
172         /*
173          * Remove the name+value at this location.  Do whatever is
174          * appropriate with the remaining name+value pairs.
175          */
176         void (*xlo_wipe_namevalue)(struct ocfs2_xa_loc *loc);
177
178         /* Fill xl_entry with a new entry */
179         void (*xlo_add_entry)(struct ocfs2_xa_loc *loc, u32 name_hash);
180
181         /* Add name+value storage to an entry */
182         void (*xlo_add_namevalue)(struct ocfs2_xa_loc *loc, int size);
183
184         /*
185          * Initialize the value buf's access and bh fields for this entry.
186          * ocfs2_xa_fill_value_buf() will handle the xv pointer.
187          */
188         void (*xlo_fill_value_buf)(struct ocfs2_xa_loc *loc,
189                                    struct ocfs2_xattr_value_buf *vb);
190 };
191
192 /*
193  * Describes an xattr entry location.  This is a memory structure
194  * tracking the on-disk structure.
195  */
196 struct ocfs2_xa_loc {
197         /* This xattr belongs to this inode */
198         struct inode *xl_inode;
199
200         /* The ocfs2_xattr_header inside the on-disk storage. Not NULL. */
201         struct ocfs2_xattr_header *xl_header;
202
203         /* Bytes from xl_header to the end of the storage */
204         int xl_size;
205
206         /*
207          * The ocfs2_xattr_entry this location describes.  If this is
208          * NULL, this location describes the on-disk structure where it
209          * would have been.
210          */
211         struct ocfs2_xattr_entry *xl_entry;
212
213         /*
214          * Internal housekeeping
215          */
216
217         /* Buffer(s) containing this entry */
218         void *xl_storage;
219
220         /* Operations on the storage backing this location */
221         const struct ocfs2_xa_loc_operations *xl_ops;
222 };
223
224 /*
225  * Convenience functions to calculate how much space is needed for a
226  * given name+value pair
227  */
228 static int namevalue_size(int name_len, uint64_t value_len)
229 {
230         if (value_len > OCFS2_XATTR_INLINE_SIZE)
231                 return OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
232         else
233                 return OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(value_len);
234 }
235
236 static int namevalue_size_xi(struct ocfs2_xattr_info *xi)
237 {
238         return namevalue_size(xi->xi_name_len, xi->xi_value_len);
239 }
240
241 static int namevalue_size_xe(struct ocfs2_xattr_entry *xe)
242 {
243         u64 value_len = le64_to_cpu(xe->xe_value_size);
244
245         BUG_ON((value_len > OCFS2_XATTR_INLINE_SIZE) &&
246                ocfs2_xattr_is_local(xe));
247         return namevalue_size(xe->xe_name_len, value_len);
248 }
249
250
251 static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
252                                              struct ocfs2_xattr_header *xh,
253                                              int index,
254                                              int *block_off,
255                                              int *new_offset);
256
257 static int ocfs2_xattr_block_find(struct inode *inode,
258                                   int name_index,
259                                   const char *name,
260                                   struct ocfs2_xattr_search *xs);
261 static int ocfs2_xattr_index_block_find(struct inode *inode,
262                                         struct buffer_head *root_bh,
263                                         int name_index,
264                                         const char *name,
265                                         struct ocfs2_xattr_search *xs);
266
267 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
268                                         struct buffer_head *blk_bh,
269                                         char *buffer,
270                                         size_t buffer_size);
271
272 static int ocfs2_xattr_create_index_block(struct inode *inode,
273                                           struct ocfs2_xattr_search *xs,
274                                           struct ocfs2_xattr_set_ctxt *ctxt);
275
276 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
277                                              struct ocfs2_xattr_info *xi,
278                                              struct ocfs2_xattr_search *xs,
279                                              struct ocfs2_xattr_set_ctxt *ctxt);
280
281 typedef int (xattr_tree_rec_func)(struct inode *inode,
282                                   struct buffer_head *root_bh,
283                                   u64 blkno, u32 cpos, u32 len, void *para);
284 static int ocfs2_iterate_xattr_index_block(struct inode *inode,
285                                            struct buffer_head *root_bh,
286                                            xattr_tree_rec_func *rec_func,
287                                            void *para);
288 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
289                                         struct ocfs2_xattr_bucket *bucket,
290                                         void *para);
291 static int ocfs2_rm_xattr_cluster(struct inode *inode,
292                                   struct buffer_head *root_bh,
293                                   u64 blkno,
294                                   u32 cpos,
295                                   u32 len,
296                                   void *para);
297
298 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
299                                   u64 src_blk, u64 last_blk, u64 to_blk,
300                                   unsigned int start_bucket,
301                                   u32 *first_hash);
302 static int ocfs2_prepare_refcount_xattr(struct inode *inode,
303                                         struct ocfs2_dinode *di,
304                                         struct ocfs2_xattr_info *xi,
305                                         struct ocfs2_xattr_search *xis,
306                                         struct ocfs2_xattr_search *xbs,
307                                         struct ocfs2_refcount_tree **ref_tree,
308                                         int *meta_need,
309                                         int *credits);
310 static int ocfs2_get_xattr_tree_value_root(struct super_block *sb,
311                                            struct ocfs2_xattr_bucket *bucket,
312                                            int offset,
313                                            struct ocfs2_xattr_value_root **xv,
314                                            struct buffer_head **bh);
315
316 static inline u16 ocfs2_xattr_buckets_per_cluster(struct ocfs2_super *osb)
317 {
318         return (1 << osb->s_clustersize_bits) / OCFS2_XATTR_BUCKET_SIZE;
319 }
320
321 static inline u16 ocfs2_blocks_per_xattr_bucket(struct super_block *sb)
322 {
323         return OCFS2_XATTR_BUCKET_SIZE / (1 << sb->s_blocksize_bits);
324 }
325
326 #define bucket_blkno(_b) ((_b)->bu_bhs[0]->b_blocknr)
327 #define bucket_block(_b, _n) ((_b)->bu_bhs[(_n)]->b_data)
328 #define bucket_xh(_b) ((struct ocfs2_xattr_header *)bucket_block((_b), 0))
329
330 static struct ocfs2_xattr_bucket *ocfs2_xattr_bucket_new(struct inode *inode)
331 {
332         struct ocfs2_xattr_bucket *bucket;
333         int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
334
335         BUG_ON(blks > OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET);
336
337         bucket = kzalloc(sizeof(struct ocfs2_xattr_bucket), GFP_NOFS);
338         if (bucket) {
339                 bucket->bu_inode = inode;
340                 bucket->bu_blocks = blks;
341         }
342
343         return bucket;
344 }
345
346 static void ocfs2_xattr_bucket_relse(struct ocfs2_xattr_bucket *bucket)
347 {
348         int i;
349
350         for (i = 0; i < bucket->bu_blocks; i++) {
351                 brelse(bucket->bu_bhs[i]);
352                 bucket->bu_bhs[i] = NULL;
353         }
354 }
355
356 static void ocfs2_xattr_bucket_free(struct ocfs2_xattr_bucket *bucket)
357 {
358         if (bucket) {
359                 ocfs2_xattr_bucket_relse(bucket);
360                 bucket->bu_inode = NULL;
361                 kfree(bucket);
362         }
363 }
364
365 /*
366  * A bucket that has never been written to disk doesn't need to be
367  * read.  We just need the buffer_heads.  Don't call this for
368  * buckets that are already on disk.  ocfs2_read_xattr_bucket() initializes
369  * them fully.
370  */
371 static int ocfs2_init_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
372                                    u64 xb_blkno)
373 {
374         int i, rc = 0;
375
376         for (i = 0; i < bucket->bu_blocks; i++) {
377                 bucket->bu_bhs[i] = sb_getblk(bucket->bu_inode->i_sb,
378                                               xb_blkno + i);
379                 if (!bucket->bu_bhs[i]) {
380                         rc = -EIO;
381                         mlog_errno(rc);
382                         break;
383                 }
384
385                 if (!ocfs2_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
386                                            bucket->bu_bhs[i]))
387                         ocfs2_set_new_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
388                                                       bucket->bu_bhs[i]);
389         }
390
391         if (rc)
392                 ocfs2_xattr_bucket_relse(bucket);
393         return rc;
394 }
395
396 /* Read the xattr bucket at xb_blkno */
397 static int ocfs2_read_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
398                                    u64 xb_blkno)
399 {
400         int rc;
401
402         rc = ocfs2_read_blocks(INODE_CACHE(bucket->bu_inode), xb_blkno,
403                                bucket->bu_blocks, bucket->bu_bhs, 0,
404                                NULL);
405         if (!rc) {
406                 spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
407                 rc = ocfs2_validate_meta_ecc_bhs(bucket->bu_inode->i_sb,
408                                                  bucket->bu_bhs,
409                                                  bucket->bu_blocks,
410                                                  &bucket_xh(bucket)->xh_check);
411                 spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
412                 if (rc)
413                         mlog_errno(rc);
414         }
415
416         if (rc)
417                 ocfs2_xattr_bucket_relse(bucket);
418         return rc;
419 }
420
421 static int ocfs2_xattr_bucket_journal_access(handle_t *handle,
422                                              struct ocfs2_xattr_bucket *bucket,
423                                              int type)
424 {
425         int i, rc = 0;
426
427         for (i = 0; i < bucket->bu_blocks; i++) {
428                 rc = ocfs2_journal_access(handle,
429                                           INODE_CACHE(bucket->bu_inode),
430                                           bucket->bu_bhs[i], type);
431                 if (rc) {
432                         mlog_errno(rc);
433                         break;
434                 }
435         }
436
437         return rc;
438 }
439
440 static void ocfs2_xattr_bucket_journal_dirty(handle_t *handle,
441                                              struct ocfs2_xattr_bucket *bucket)
442 {
443         int i;
444
445         spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
446         ocfs2_compute_meta_ecc_bhs(bucket->bu_inode->i_sb,
447                                    bucket->bu_bhs, bucket->bu_blocks,
448                                    &bucket_xh(bucket)->xh_check);
449         spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
450
451         for (i = 0; i < bucket->bu_blocks; i++)
452                 ocfs2_journal_dirty(handle, bucket->bu_bhs[i]);
453 }
454
455 static void ocfs2_xattr_bucket_copy_data(struct ocfs2_xattr_bucket *dest,
456                                          struct ocfs2_xattr_bucket *src)
457 {
458         int i;
459         int blocksize = src->bu_inode->i_sb->s_blocksize;
460
461         BUG_ON(dest->bu_blocks != src->bu_blocks);
462         BUG_ON(dest->bu_inode != src->bu_inode);
463
464         for (i = 0; i < src->bu_blocks; i++) {
465                 memcpy(bucket_block(dest, i), bucket_block(src, i),
466                        blocksize);
467         }
468 }
469
470 static int ocfs2_validate_xattr_block(struct super_block *sb,
471                                       struct buffer_head *bh)
472 {
473         int rc;
474         struct ocfs2_xattr_block *xb =
475                 (struct ocfs2_xattr_block *)bh->b_data;
476
477         trace_ocfs2_validate_xattr_block((unsigned long long)bh->b_blocknr);
478
479         BUG_ON(!buffer_uptodate(bh));
480
481         /*
482          * If the ecc fails, we return the error but otherwise
483          * leave the filesystem running.  We know any error is
484          * local to this block.
485          */
486         rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &xb->xb_check);
487         if (rc)
488                 return rc;
489
490         /*
491          * Errors after here are fatal
492          */
493
494         if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
495                 ocfs2_error(sb,
496                             "Extended attribute block #%llu has bad "
497                             "signature %.*s",
498                             (unsigned long long)bh->b_blocknr, 7,
499                             xb->xb_signature);
500                 return -EINVAL;
501         }
502
503         if (le64_to_cpu(xb->xb_blkno) != bh->b_blocknr) {
504                 ocfs2_error(sb,
505                             "Extended attribute block #%llu has an "
506                             "invalid xb_blkno of %llu",
507                             (unsigned long long)bh->b_blocknr,
508                             (unsigned long long)le64_to_cpu(xb->xb_blkno));
509                 return -EINVAL;
510         }
511
512         if (le32_to_cpu(xb->xb_fs_generation) != OCFS2_SB(sb)->fs_generation) {
513                 ocfs2_error(sb,
514                             "Extended attribute block #%llu has an invalid "
515                             "xb_fs_generation of #%u",
516                             (unsigned long long)bh->b_blocknr,
517                             le32_to_cpu(xb->xb_fs_generation));
518                 return -EINVAL;
519         }
520
521         return 0;
522 }
523
524 static int ocfs2_read_xattr_block(struct inode *inode, u64 xb_blkno,
525                                   struct buffer_head **bh)
526 {
527         int rc;
528         struct buffer_head *tmp = *bh;
529
530         rc = ocfs2_read_block(INODE_CACHE(inode), xb_blkno, &tmp,
531                               ocfs2_validate_xattr_block);
532
533         /* If ocfs2_read_block() got us a new bh, pass it up. */
534         if (!rc && !*bh)
535                 *bh = tmp;
536
537         return rc;
538 }
539
540 static inline const char *ocfs2_xattr_prefix(int name_index)
541 {
542         const struct xattr_handler *handler = NULL;
543
544         if (name_index > 0 && name_index < OCFS2_XATTR_MAX)
545                 handler = ocfs2_xattr_handler_map[name_index];
546
547         return handler ? handler->prefix : NULL;
548 }
549
550 static u32 ocfs2_xattr_name_hash(struct inode *inode,
551                                  const char *name,
552                                  int name_len)
553 {
554         /* Get hash value of uuid from super block */
555         u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash;
556         int i;
557
558         /* hash extended attribute name */
559         for (i = 0; i < name_len; i++) {
560                 hash = (hash << OCFS2_HASH_SHIFT) ^
561                        (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
562                        *name++;
563         }
564
565         return hash;
566 }
567
568 static int ocfs2_xattr_entry_real_size(int name_len, size_t value_len)
569 {
570         return namevalue_size(name_len, value_len) +
571                 sizeof(struct ocfs2_xattr_entry);
572 }
573
574 static int ocfs2_xi_entry_usage(struct ocfs2_xattr_info *xi)
575 {
576         return namevalue_size_xi(xi) +
577                 sizeof(struct ocfs2_xattr_entry);
578 }
579
580 static int ocfs2_xe_entry_usage(struct ocfs2_xattr_entry *xe)
581 {
582         return namevalue_size_xe(xe) +
583                 sizeof(struct ocfs2_xattr_entry);
584 }
585
586 int ocfs2_calc_security_init(struct inode *dir,
587                              struct ocfs2_security_xattr_info *si,
588                              int *want_clusters,
589                              int *xattr_credits,
590                              struct ocfs2_alloc_context **xattr_ac)
591 {
592         int ret = 0;
593         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
594         int s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
595                                                  si->value_len);
596
597         /*
598          * The max space of security xattr taken inline is
599          * 256(name) + 80(value) + 16(entry) = 352 bytes,
600          * So reserve one metadata block for it is ok.
601          */
602         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
603             s_size > OCFS2_XATTR_FREE_IN_IBODY) {
604                 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, xattr_ac);
605                 if (ret) {
606                         mlog_errno(ret);
607                         return ret;
608                 }
609                 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
610         }
611
612         /* reserve clusters for xattr value which will be set in B tree*/
613         if (si->value_len > OCFS2_XATTR_INLINE_SIZE) {
614                 int new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
615                                                             si->value_len);
616
617                 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
618                                                            new_clusters);
619                 *want_clusters += new_clusters;
620         }
621         return ret;
622 }
623
624 int ocfs2_calc_xattr_init(struct inode *dir,
625                           struct buffer_head *dir_bh,
626                           umode_t mode,
627                           struct ocfs2_security_xattr_info *si,
628                           int *want_clusters,
629                           int *xattr_credits,
630                           int *want_meta)
631 {
632         int ret = 0;
633         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
634         int s_size = 0, a_size = 0, acl_len = 0, new_clusters;
635
636         if (si->enable)
637                 s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
638                                                      si->value_len);
639
640         if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
641                 acl_len = ocfs2_xattr_get_nolock(dir, dir_bh,
642                                         OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT,
643                                         "", NULL, 0);
644                 if (acl_len > 0) {
645                         a_size = ocfs2_xattr_entry_real_size(0, acl_len);
646                         if (S_ISDIR(mode))
647                                 a_size <<= 1;
648                 } else if (acl_len != 0 && acl_len != -ENODATA) {
649                         mlog_errno(ret);
650                         return ret;
651                 }
652         }
653
654         if (!(s_size + a_size))
655                 return ret;
656
657         /*
658          * The max space of security xattr taken inline is
659          * 256(name) + 80(value) + 16(entry) = 352 bytes,
660          * The max space of acl xattr taken inline is
661          * 80(value) + 16(entry) * 2(if directory) = 192 bytes,
662          * when blocksize = 512, may reserve one more cluser for
663          * xattr bucket, otherwise reserve one metadata block
664          * for them is ok.
665          * If this is a new directory with inline data,
666          * we choose to reserve the entire inline area for
667          * directory contents and force an external xattr block.
668          */
669         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
670             (S_ISDIR(mode) && ocfs2_supports_inline_data(osb)) ||
671             (s_size + a_size) > OCFS2_XATTR_FREE_IN_IBODY) {
672                 *want_meta = *want_meta + 1;
673                 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
674         }
675
676         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE &&
677             (s_size + a_size) > OCFS2_XATTR_FREE_IN_BLOCK(dir)) {
678                 *want_clusters += 1;
679                 *xattr_credits += ocfs2_blocks_per_xattr_bucket(dir->i_sb);
680         }
681
682         /*
683          * reserve credits and clusters for xattrs which has large value
684          * and have to be set outside
685          */
686         if (si->enable && si->value_len > OCFS2_XATTR_INLINE_SIZE) {
687                 new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
688                                                         si->value_len);
689                 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
690                                                            new_clusters);
691                 *want_clusters += new_clusters;
692         }
693         if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL &&
694             acl_len > OCFS2_XATTR_INLINE_SIZE) {
695                 /* for directory, it has DEFAULT and ACCESS two types of acls */
696                 new_clusters = (S_ISDIR(mode) ? 2 : 1) *
697                                 ocfs2_clusters_for_bytes(dir->i_sb, acl_len);
698                 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
699                                                            new_clusters);
700                 *want_clusters += new_clusters;
701         }
702
703         return ret;
704 }
705
706 static int ocfs2_xattr_extend_allocation(struct inode *inode,
707                                          u32 clusters_to_add,
708                                          struct ocfs2_xattr_value_buf *vb,
709                                          struct ocfs2_xattr_set_ctxt *ctxt)
710 {
711         int status = 0, credits;
712         handle_t *handle = ctxt->handle;
713         enum ocfs2_alloc_restarted why;
714         u32 prev_clusters, logical_start = le32_to_cpu(vb->vb_xv->xr_clusters);
715         struct ocfs2_extent_tree et;
716
717         ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
718
719         while (clusters_to_add) {
720                 trace_ocfs2_xattr_extend_allocation(clusters_to_add);
721
722                 status = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
723                                        OCFS2_JOURNAL_ACCESS_WRITE);
724                 if (status < 0) {
725                         mlog_errno(status);
726                         break;
727                 }
728
729                 prev_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
730                 status = ocfs2_add_clusters_in_btree(handle,
731                                                      &et,
732                                                      &logical_start,
733                                                      clusters_to_add,
734                                                      0,
735                                                      ctxt->data_ac,
736                                                      ctxt->meta_ac,
737                                                      &why);
738                 if ((status < 0) && (status != -EAGAIN)) {
739                         if (status != -ENOSPC)
740                                 mlog_errno(status);
741                         break;
742                 }
743
744                 ocfs2_journal_dirty(handle, vb->vb_bh);
745
746                 clusters_to_add -= le32_to_cpu(vb->vb_xv->xr_clusters) -
747                                          prev_clusters;
748
749                 if (why != RESTART_NONE && clusters_to_add) {
750                         /*
751                          * We can only fail in case the alloc file doesn't give
752                          * up enough clusters.
753                          */
754                         BUG_ON(why == RESTART_META);
755
756                         credits = ocfs2_calc_extend_credits(inode->i_sb,
757                                                             &vb->vb_xv->xr_list,
758                                                             clusters_to_add);
759                         status = ocfs2_extend_trans(handle, credits);
760                         if (status < 0) {
761                                 status = -ENOMEM;
762                                 mlog_errno(status);
763                                 break;
764                         }
765                 }
766         }
767
768         return status;
769 }
770
771 static int __ocfs2_remove_xattr_range(struct inode *inode,
772                                       struct ocfs2_xattr_value_buf *vb,
773                                       u32 cpos, u32 phys_cpos, u32 len,
774                                       unsigned int ext_flags,
775                                       struct ocfs2_xattr_set_ctxt *ctxt)
776 {
777         int ret;
778         u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
779         handle_t *handle = ctxt->handle;
780         struct ocfs2_extent_tree et;
781
782         ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
783
784         ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
785                             OCFS2_JOURNAL_ACCESS_WRITE);
786         if (ret) {
787                 mlog_errno(ret);
788                 goto out;
789         }
790
791         ret = ocfs2_remove_extent(handle, &et, cpos, len, ctxt->meta_ac,
792                                   &ctxt->dealloc);
793         if (ret) {
794                 mlog_errno(ret);
795                 goto out;
796         }
797
798         le32_add_cpu(&vb->vb_xv->xr_clusters, -len);
799         ocfs2_journal_dirty(handle, vb->vb_bh);
800
801         if (ext_flags & OCFS2_EXT_REFCOUNTED)
802                 ret = ocfs2_decrease_refcount(inode, handle,
803                                         ocfs2_blocks_to_clusters(inode->i_sb,
804                                                                  phys_blkno),
805                                         len, ctxt->meta_ac, &ctxt->dealloc, 1);
806         else
807                 ret = ocfs2_cache_cluster_dealloc(&ctxt->dealloc,
808                                                   phys_blkno, len);
809         if (ret)
810                 mlog_errno(ret);
811
812 out:
813         return ret;
814 }
815
816 static int ocfs2_xattr_shrink_size(struct inode *inode,
817                                    u32 old_clusters,
818                                    u32 new_clusters,
819                                    struct ocfs2_xattr_value_buf *vb,
820                                    struct ocfs2_xattr_set_ctxt *ctxt)
821 {
822         int ret = 0;
823         unsigned int ext_flags;
824         u32 trunc_len, cpos, phys_cpos, alloc_size;
825         u64 block;
826
827         if (old_clusters <= new_clusters)
828                 return 0;
829
830         cpos = new_clusters;
831         trunc_len = old_clusters - new_clusters;
832         while (trunc_len) {
833                 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
834                                                &alloc_size,
835                                                &vb->vb_xv->xr_list, &ext_flags);
836                 if (ret) {
837                         mlog_errno(ret);
838                         goto out;
839                 }
840
841                 if (alloc_size > trunc_len)
842                         alloc_size = trunc_len;
843
844                 ret = __ocfs2_remove_xattr_range(inode, vb, cpos,
845                                                  phys_cpos, alloc_size,
846                                                  ext_flags, ctxt);
847                 if (ret) {
848                         mlog_errno(ret);
849                         goto out;
850                 }
851
852                 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
853                 ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode),
854                                                        block, alloc_size);
855                 cpos += alloc_size;
856                 trunc_len -= alloc_size;
857         }
858
859 out:
860         return ret;
861 }
862
863 static int ocfs2_xattr_value_truncate(struct inode *inode,
864                                       struct ocfs2_xattr_value_buf *vb,
865                                       int len,
866                                       struct ocfs2_xattr_set_ctxt *ctxt)
867 {
868         int ret;
869         u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
870         u32 old_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
871
872         if (new_clusters == old_clusters)
873                 return 0;
874
875         if (new_clusters > old_clusters)
876                 ret = ocfs2_xattr_extend_allocation(inode,
877                                                     new_clusters - old_clusters,
878                                                     vb, ctxt);
879         else
880                 ret = ocfs2_xattr_shrink_size(inode,
881                                               old_clusters, new_clusters,
882                                               vb, ctxt);
883
884         return ret;
885 }
886
887 static int ocfs2_xattr_list_entry(char *buffer, size_t size,
888                                   size_t *result, const char *prefix,
889                                   const char *name, int name_len)
890 {
891         char *p = buffer + *result;
892         int prefix_len = strlen(prefix);
893         int total_len = prefix_len + name_len + 1;
894
895         *result += total_len;
896
897         /* we are just looking for how big our buffer needs to be */
898         if (!size)
899                 return 0;
900
901         if (*result > size)
902                 return -ERANGE;
903
904         memcpy(p, prefix, prefix_len);
905         memcpy(p + prefix_len, name, name_len);
906         p[prefix_len + name_len] = '\0';
907
908         return 0;
909 }
910
911 static int ocfs2_xattr_list_entries(struct inode *inode,
912                                     struct ocfs2_xattr_header *header,
913                                     char *buffer, size_t buffer_size)
914 {
915         size_t result = 0;
916         int i, type, ret;
917         const char *prefix, *name;
918
919         for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
920                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
921                 type = ocfs2_xattr_get_type(entry);
922                 prefix = ocfs2_xattr_prefix(type);
923
924                 if (prefix) {
925                         name = (const char *)header +
926                                 le16_to_cpu(entry->xe_name_offset);
927
928                         ret = ocfs2_xattr_list_entry(buffer, buffer_size,
929                                                      &result, prefix, name,
930                                                      entry->xe_name_len);
931                         if (ret)
932                                 return ret;
933                 }
934         }
935
936         return result;
937 }
938
939 int ocfs2_has_inline_xattr_value_outside(struct inode *inode,
940                                          struct ocfs2_dinode *di)
941 {
942         struct ocfs2_xattr_header *xh;
943         int i;
944
945         xh = (struct ocfs2_xattr_header *)
946                  ((void *)di + inode->i_sb->s_blocksize -
947                  le16_to_cpu(di->i_xattr_inline_size));
948
949         for (i = 0; i < le16_to_cpu(xh->xh_count); i++)
950                 if (!ocfs2_xattr_is_local(&xh->xh_entries[i]))
951                         return 1;
952
953         return 0;
954 }
955
956 static int ocfs2_xattr_ibody_list(struct inode *inode,
957                                   struct ocfs2_dinode *di,
958                                   char *buffer,
959                                   size_t buffer_size)
960 {
961         struct ocfs2_xattr_header *header = NULL;
962         struct ocfs2_inode_info *oi = OCFS2_I(inode);
963         int ret = 0;
964
965         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
966                 return ret;
967
968         header = (struct ocfs2_xattr_header *)
969                  ((void *)di + inode->i_sb->s_blocksize -
970                  le16_to_cpu(di->i_xattr_inline_size));
971
972         ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size);
973
974         return ret;
975 }
976
977 static int ocfs2_xattr_block_list(struct inode *inode,
978                                   struct ocfs2_dinode *di,
979                                   char *buffer,
980                                   size_t buffer_size)
981 {
982         struct buffer_head *blk_bh = NULL;
983         struct ocfs2_xattr_block *xb;
984         int ret = 0;
985
986         if (!di->i_xattr_loc)
987                 return ret;
988
989         ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
990                                      &blk_bh);
991         if (ret < 0) {
992                 mlog_errno(ret);
993                 return ret;
994         }
995
996         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
997         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
998                 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
999                 ret = ocfs2_xattr_list_entries(inode, header,
1000                                                buffer, buffer_size);
1001         } else
1002                 ret = ocfs2_xattr_tree_list_index_block(inode, blk_bh,
1003                                                    buffer, buffer_size);
1004
1005         brelse(blk_bh);
1006
1007         return ret;
1008 }
1009
1010 ssize_t ocfs2_listxattr(struct dentry *dentry,
1011                         char *buffer,
1012                         size_t size)
1013 {
1014         int ret = 0, i_ret = 0, b_ret = 0;
1015         struct buffer_head *di_bh = NULL;
1016         struct ocfs2_dinode *di = NULL;
1017         struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode);
1018
1019         if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
1020                 return -EOPNOTSUPP;
1021
1022         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1023                 return ret;
1024
1025         ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0);
1026         if (ret < 0) {
1027                 mlog_errno(ret);
1028                 return ret;
1029         }
1030
1031         di = (struct ocfs2_dinode *)di_bh->b_data;
1032
1033         down_read(&oi->ip_xattr_sem);
1034         i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size);
1035         if (i_ret < 0)
1036                 b_ret = 0;
1037         else {
1038                 if (buffer) {
1039                         buffer += i_ret;
1040                         size -= i_ret;
1041                 }
1042                 b_ret = ocfs2_xattr_block_list(dentry->d_inode, di,
1043                                                buffer, size);
1044                 if (b_ret < 0)
1045                         i_ret = 0;
1046         }
1047         up_read(&oi->ip_xattr_sem);
1048         ocfs2_inode_unlock(dentry->d_inode, 0);
1049
1050         brelse(di_bh);
1051
1052         return i_ret + b_ret;
1053 }
1054
1055 static int ocfs2_xattr_find_entry(int name_index,
1056                                   const char *name,
1057                                   struct ocfs2_xattr_search *xs)
1058 {
1059         struct ocfs2_xattr_entry *entry;
1060         size_t name_len;
1061         int i, cmp = 1;
1062
1063         if (name == NULL)
1064                 return -EINVAL;
1065
1066         name_len = strlen(name);
1067         entry = xs->here;
1068         for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
1069                 cmp = name_index - ocfs2_xattr_get_type(entry);
1070                 if (!cmp)
1071                         cmp = name_len - entry->xe_name_len;
1072                 if (!cmp)
1073                         cmp = memcmp(name, (xs->base +
1074                                      le16_to_cpu(entry->xe_name_offset)),
1075                                      name_len);
1076                 if (cmp == 0)
1077                         break;
1078                 entry += 1;
1079         }
1080         xs->here = entry;
1081
1082         return cmp ? -ENODATA : 0;
1083 }
1084
1085 static int ocfs2_xattr_get_value_outside(struct inode *inode,
1086                                          struct ocfs2_xattr_value_root *xv,
1087                                          void *buffer,
1088                                          size_t len)
1089 {
1090         u32 cpos, p_cluster, num_clusters, bpc, clusters;
1091         u64 blkno;
1092         int i, ret = 0;
1093         size_t cplen, blocksize;
1094         struct buffer_head *bh = NULL;
1095         struct ocfs2_extent_list *el;
1096
1097         el = &xv->xr_list;
1098         clusters = le32_to_cpu(xv->xr_clusters);
1099         bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1100         blocksize = inode->i_sb->s_blocksize;
1101
1102         cpos = 0;
1103         while (cpos < clusters) {
1104                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
1105                                                &num_clusters, el, NULL);
1106                 if (ret) {
1107                         mlog_errno(ret);
1108                         goto out;
1109                 }
1110
1111                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
1112                 /* Copy ocfs2_xattr_value */
1113                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1114                         ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
1115                                                &bh, NULL);
1116                         if (ret) {
1117                                 mlog_errno(ret);
1118                                 goto out;
1119                         }
1120
1121                         cplen = len >= blocksize ? blocksize : len;
1122                         memcpy(buffer, bh->b_data, cplen);
1123                         len -= cplen;
1124                         buffer += cplen;
1125
1126                         brelse(bh);
1127                         bh = NULL;
1128                         if (len == 0)
1129                                 break;
1130                 }
1131                 cpos += num_clusters;
1132         }
1133 out:
1134         return ret;
1135 }
1136
1137 static int ocfs2_xattr_ibody_get(struct inode *inode,
1138                                  int name_index,
1139                                  const char *name,
1140                                  void *buffer,
1141                                  size_t buffer_size,
1142                                  struct ocfs2_xattr_search *xs)
1143 {
1144         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1145         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1146         struct ocfs2_xattr_value_root *xv;
1147         size_t size;
1148         int ret = 0;
1149
1150         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
1151                 return -ENODATA;
1152
1153         xs->end = (void *)di + inode->i_sb->s_blocksize;
1154         xs->header = (struct ocfs2_xattr_header *)
1155                         (xs->end - le16_to_cpu(di->i_xattr_inline_size));
1156         xs->base = (void *)xs->header;
1157         xs->here = xs->header->xh_entries;
1158
1159         ret = ocfs2_xattr_find_entry(name_index, name, xs);
1160         if (ret)
1161                 return ret;
1162         size = le64_to_cpu(xs->here->xe_value_size);
1163         if (buffer) {
1164                 if (size > buffer_size)
1165                         return -ERANGE;
1166                 if (ocfs2_xattr_is_local(xs->here)) {
1167                         memcpy(buffer, (void *)xs->base +
1168                                le16_to_cpu(xs->here->xe_name_offset) +
1169                                OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
1170                 } else {
1171                         xv = (struct ocfs2_xattr_value_root *)
1172                                 (xs->base + le16_to_cpu(
1173                                  xs->here->xe_name_offset) +
1174                                 OCFS2_XATTR_SIZE(xs->here->xe_name_len));
1175                         ret = ocfs2_xattr_get_value_outside(inode, xv,
1176                                                             buffer, size);
1177                         if (ret < 0) {
1178                                 mlog_errno(ret);
1179                                 return ret;
1180                         }
1181                 }
1182         }
1183
1184         return size;
1185 }
1186
1187 static int ocfs2_xattr_block_get(struct inode *inode,
1188                                  int name_index,
1189                                  const char *name,
1190                                  void *buffer,
1191                                  size_t buffer_size,
1192                                  struct ocfs2_xattr_search *xs)
1193 {
1194         struct ocfs2_xattr_block *xb;
1195         struct ocfs2_xattr_value_root *xv;
1196         size_t size;
1197         int ret = -ENODATA, name_offset, name_len, i;
1198         int uninitialized_var(block_off);
1199
1200         xs->bucket = ocfs2_xattr_bucket_new(inode);
1201         if (!xs->bucket) {
1202                 ret = -ENOMEM;
1203                 mlog_errno(ret);
1204                 goto cleanup;
1205         }
1206
1207         ret = ocfs2_xattr_block_find(inode, name_index, name, xs);
1208         if (ret) {
1209                 mlog_errno(ret);
1210                 goto cleanup;
1211         }
1212
1213         if (xs->not_found) {
1214                 ret = -ENODATA;
1215                 goto cleanup;
1216         }
1217
1218         xb = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1219         size = le64_to_cpu(xs->here->xe_value_size);
1220         if (buffer) {
1221                 ret = -ERANGE;
1222                 if (size > buffer_size)
1223                         goto cleanup;
1224
1225                 name_offset = le16_to_cpu(xs->here->xe_name_offset);
1226                 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
1227                 i = xs->here - xs->header->xh_entries;
1228
1229                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
1230                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
1231                                                                 bucket_xh(xs->bucket),
1232                                                                 i,
1233                                                                 &block_off,
1234                                                                 &name_offset);
1235                         xs->base = bucket_block(xs->bucket, block_off);
1236                 }
1237                 if (ocfs2_xattr_is_local(xs->here)) {
1238                         memcpy(buffer, (void *)xs->base +
1239                                name_offset + name_len, size);
1240                 } else {
1241                         xv = (struct ocfs2_xattr_value_root *)
1242                                 (xs->base + name_offset + name_len);
1243                         ret = ocfs2_xattr_get_value_outside(inode, xv,
1244                                                             buffer, size);
1245                         if (ret < 0) {
1246                                 mlog_errno(ret);
1247                                 goto cleanup;
1248                         }
1249                 }
1250         }
1251         ret = size;
1252 cleanup:
1253         ocfs2_xattr_bucket_free(xs->bucket);
1254
1255         brelse(xs->xattr_bh);
1256         xs->xattr_bh = NULL;
1257         return ret;
1258 }
1259
1260 int ocfs2_xattr_get_nolock(struct inode *inode,
1261                            struct buffer_head *di_bh,
1262                            int name_index,
1263                            const char *name,
1264                            void *buffer,
1265                            size_t buffer_size)
1266 {
1267         int ret;
1268         struct ocfs2_dinode *di = NULL;
1269         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1270         struct ocfs2_xattr_search xis = {
1271                 .not_found = -ENODATA,
1272         };
1273         struct ocfs2_xattr_search xbs = {
1274                 .not_found = -ENODATA,
1275         };
1276
1277         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1278                 return -EOPNOTSUPP;
1279
1280         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1281                 ret = -ENODATA;
1282
1283         xis.inode_bh = xbs.inode_bh = di_bh;
1284         di = (struct ocfs2_dinode *)di_bh->b_data;
1285
1286         ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
1287                                     buffer_size, &xis);
1288         if (ret == -ENODATA && di->i_xattr_loc)
1289                 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
1290                                             buffer_size, &xbs);
1291
1292         return ret;
1293 }
1294
1295 /* ocfs2_xattr_get()
1296  *
1297  * Copy an extended attribute into the buffer provided.
1298  * Buffer is NULL to compute the size of buffer required.
1299  */
1300 static int ocfs2_xattr_get(struct inode *inode,
1301                            int name_index,
1302                            const char *name,
1303                            void *buffer,
1304                            size_t buffer_size)
1305 {
1306         int ret;
1307         struct buffer_head *di_bh = NULL;
1308
1309         ret = ocfs2_inode_lock(inode, &di_bh, 0);
1310         if (ret < 0) {
1311                 mlog_errno(ret);
1312                 return ret;
1313         }
1314         down_read(&OCFS2_I(inode)->ip_xattr_sem);
1315         ret = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
1316                                      name, buffer, buffer_size);
1317         up_read(&OCFS2_I(inode)->ip_xattr_sem);
1318
1319         ocfs2_inode_unlock(inode, 0);
1320
1321         brelse(di_bh);
1322
1323         return ret;
1324 }
1325
1326 static int __ocfs2_xattr_set_value_outside(struct inode *inode,
1327                                            handle_t *handle,
1328                                            struct ocfs2_xattr_value_buf *vb,
1329                                            const void *value,
1330                                            int value_len)
1331 {
1332         int ret = 0, i, cp_len;
1333         u16 blocksize = inode->i_sb->s_blocksize;
1334         u32 p_cluster, num_clusters;
1335         u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1336         u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
1337         u64 blkno;
1338         struct buffer_head *bh = NULL;
1339         unsigned int ext_flags;
1340         struct ocfs2_xattr_value_root *xv = vb->vb_xv;
1341
1342         BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
1343
1344         while (cpos < clusters) {
1345                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
1346                                                &num_clusters, &xv->xr_list,
1347                                                &ext_flags);
1348                 if (ret) {
1349                         mlog_errno(ret);
1350                         goto out;
1351                 }
1352
1353                 BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
1354
1355                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
1356
1357                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1358                         ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
1359                                                &bh, NULL);
1360                         if (ret) {
1361                                 mlog_errno(ret);
1362                                 goto out;
1363                         }
1364
1365                         ret = ocfs2_journal_access(handle,
1366                                                    INODE_CACHE(inode),
1367                                                    bh,
1368                                                    OCFS2_JOURNAL_ACCESS_WRITE);
1369                         if (ret < 0) {
1370                                 mlog_errno(ret);
1371                                 goto out;
1372                         }
1373
1374                         cp_len = value_len > blocksize ? blocksize : value_len;
1375                         memcpy(bh->b_data, value, cp_len);
1376                         value_len -= cp_len;
1377                         value += cp_len;
1378                         if (cp_len < blocksize)
1379                                 memset(bh->b_data + cp_len, 0,
1380                                        blocksize - cp_len);
1381
1382                         ocfs2_journal_dirty(handle, bh);
1383                         brelse(bh);
1384                         bh = NULL;
1385
1386                         /*
1387                          * XXX: do we need to empty all the following
1388                          * blocks in this cluster?
1389                          */
1390                         if (!value_len)
1391                                 break;
1392                 }
1393                 cpos += num_clusters;
1394         }
1395 out:
1396         brelse(bh);
1397
1398         return ret;
1399 }
1400
1401 static int ocfs2_xa_check_space_helper(int needed_space, int free_start,
1402                                        int num_entries)
1403 {
1404         int free_space;
1405
1406         if (!needed_space)
1407                 return 0;
1408
1409         free_space = free_start -
1410                 sizeof(struct ocfs2_xattr_header) -
1411                 (num_entries * sizeof(struct ocfs2_xattr_entry)) -
1412                 OCFS2_XATTR_HEADER_GAP;
1413         if (free_space < 0)
1414                 return -EIO;
1415         if (free_space < needed_space)
1416                 return -ENOSPC;
1417
1418         return 0;
1419 }
1420
1421 static int ocfs2_xa_journal_access(handle_t *handle, struct ocfs2_xa_loc *loc,
1422                                    int type)
1423 {
1424         return loc->xl_ops->xlo_journal_access(handle, loc, type);
1425 }
1426
1427 static void ocfs2_xa_journal_dirty(handle_t *handle, struct ocfs2_xa_loc *loc)
1428 {
1429         loc->xl_ops->xlo_journal_dirty(handle, loc);
1430 }
1431
1432 /* Give a pointer into the storage for the given offset */
1433 static void *ocfs2_xa_offset_pointer(struct ocfs2_xa_loc *loc, int offset)
1434 {
1435         BUG_ON(offset >= loc->xl_size);
1436         return loc->xl_ops->xlo_offset_pointer(loc, offset);
1437 }
1438
1439 /*
1440  * Wipe the name+value pair and allow the storage to reclaim it.  This
1441  * must be followed by either removal of the entry or a call to
1442  * ocfs2_xa_add_namevalue().
1443  */
1444 static void ocfs2_xa_wipe_namevalue(struct ocfs2_xa_loc *loc)
1445 {
1446         loc->xl_ops->xlo_wipe_namevalue(loc);
1447 }
1448
1449 /*
1450  * Find lowest offset to a name+value pair.  This is the start of our
1451  * downward-growing free space.
1452  */
1453 static int ocfs2_xa_get_free_start(struct ocfs2_xa_loc *loc)
1454 {
1455         return loc->xl_ops->xlo_get_free_start(loc);
1456 }
1457
1458 /* Can we reuse loc->xl_entry for xi? */
1459 static int ocfs2_xa_can_reuse_entry(struct ocfs2_xa_loc *loc,
1460                                     struct ocfs2_xattr_info *xi)
1461 {
1462         return loc->xl_ops->xlo_can_reuse(loc, xi);
1463 }
1464
1465 /* How much free space is needed to set the new value */
1466 static int ocfs2_xa_check_space(struct ocfs2_xa_loc *loc,
1467                                 struct ocfs2_xattr_info *xi)
1468 {
1469         return loc->xl_ops->xlo_check_space(loc, xi);
1470 }
1471
1472 static void ocfs2_xa_add_entry(struct ocfs2_xa_loc *loc, u32 name_hash)
1473 {
1474         loc->xl_ops->xlo_add_entry(loc, name_hash);
1475         loc->xl_entry->xe_name_hash = cpu_to_le32(name_hash);
1476         /*
1477          * We can't leave the new entry's xe_name_offset at zero or
1478          * add_namevalue() will go nuts.  We set it to the size of our
1479          * storage so that it can never be less than any other entry.
1480          */
1481         loc->xl_entry->xe_name_offset = cpu_to_le16(loc->xl_size);
1482 }
1483
1484 static void ocfs2_xa_add_namevalue(struct ocfs2_xa_loc *loc,
1485                                    struct ocfs2_xattr_info *xi)
1486 {
1487         int size = namevalue_size_xi(xi);
1488         int nameval_offset;
1489         char *nameval_buf;
1490
1491         loc->xl_ops->xlo_add_namevalue(loc, size);
1492         loc->xl_entry->xe_value_size = cpu_to_le64(xi->xi_value_len);
1493         loc->xl_entry->xe_name_len = xi->xi_name_len;
1494         ocfs2_xattr_set_type(loc->xl_entry, xi->xi_name_index);
1495         ocfs2_xattr_set_local(loc->xl_entry,
1496                               xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE);
1497
1498         nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1499         nameval_buf = ocfs2_xa_offset_pointer(loc, nameval_offset);
1500         memset(nameval_buf, 0, size);
1501         memcpy(nameval_buf, xi->xi_name, xi->xi_name_len);
1502 }
1503
1504 static void ocfs2_xa_fill_value_buf(struct ocfs2_xa_loc *loc,
1505                                     struct ocfs2_xattr_value_buf *vb)
1506 {
1507         int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1508         int name_size = OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len);
1509
1510         /* Value bufs are for value trees */
1511         BUG_ON(ocfs2_xattr_is_local(loc->xl_entry));
1512         BUG_ON(namevalue_size_xe(loc->xl_entry) !=
1513                (name_size + OCFS2_XATTR_ROOT_SIZE));
1514
1515         loc->xl_ops->xlo_fill_value_buf(loc, vb);
1516         vb->vb_xv =
1517                 (struct ocfs2_xattr_value_root *)ocfs2_xa_offset_pointer(loc,
1518                                                         nameval_offset +
1519                                                         name_size);
1520 }
1521
1522 static int ocfs2_xa_block_journal_access(handle_t *handle,
1523                                          struct ocfs2_xa_loc *loc, int type)
1524 {
1525         struct buffer_head *bh = loc->xl_storage;
1526         ocfs2_journal_access_func access;
1527
1528         if (loc->xl_size == (bh->b_size -
1529                              offsetof(struct ocfs2_xattr_block,
1530                                       xb_attrs.xb_header)))
1531                 access = ocfs2_journal_access_xb;
1532         else
1533                 access = ocfs2_journal_access_di;
1534         return access(handle, INODE_CACHE(loc->xl_inode), bh, type);
1535 }
1536
1537 static void ocfs2_xa_block_journal_dirty(handle_t *handle,
1538                                          struct ocfs2_xa_loc *loc)
1539 {
1540         struct buffer_head *bh = loc->xl_storage;
1541
1542         ocfs2_journal_dirty(handle, bh);
1543 }
1544
1545 static void *ocfs2_xa_block_offset_pointer(struct ocfs2_xa_loc *loc,
1546                                            int offset)
1547 {
1548         return (char *)loc->xl_header + offset;
1549 }
1550
1551 static int ocfs2_xa_block_can_reuse(struct ocfs2_xa_loc *loc,
1552                                     struct ocfs2_xattr_info *xi)
1553 {
1554         /*
1555          * Block storage is strict.  If the sizes aren't exact, we will
1556          * remove the old one and reinsert the new.
1557          */
1558         return namevalue_size_xe(loc->xl_entry) ==
1559                 namevalue_size_xi(xi);
1560 }
1561
1562 static int ocfs2_xa_block_get_free_start(struct ocfs2_xa_loc *loc)
1563 {
1564         struct ocfs2_xattr_header *xh = loc->xl_header;
1565         int i, count = le16_to_cpu(xh->xh_count);
1566         int offset, free_start = loc->xl_size;
1567
1568         for (i = 0; i < count; i++) {
1569                 offset = le16_to_cpu(xh->xh_entries[i].xe_name_offset);
1570                 if (offset < free_start)
1571                         free_start = offset;
1572         }
1573
1574         return free_start;
1575 }
1576
1577 static int ocfs2_xa_block_check_space(struct ocfs2_xa_loc *loc,
1578                                       struct ocfs2_xattr_info *xi)
1579 {
1580         int count = le16_to_cpu(loc->xl_header->xh_count);
1581         int free_start = ocfs2_xa_get_free_start(loc);
1582         int needed_space = ocfs2_xi_entry_usage(xi);
1583
1584         /*
1585          * Block storage will reclaim the original entry before inserting
1586          * the new value, so we only need the difference.  If the new
1587          * entry is smaller than the old one, we don't need anything.
1588          */
1589         if (loc->xl_entry) {
1590                 /* Don't need space if we're reusing! */
1591                 if (ocfs2_xa_can_reuse_entry(loc, xi))
1592                         needed_space = 0;
1593                 else
1594                         needed_space -= ocfs2_xe_entry_usage(loc->xl_entry);
1595         }
1596         if (needed_space < 0)
1597                 needed_space = 0;
1598         return ocfs2_xa_check_space_helper(needed_space, free_start, count);
1599 }
1600
1601 /*
1602  * Block storage for xattrs keeps the name+value pairs compacted.  When
1603  * we remove one, we have to shift any that preceded it towards the end.
1604  */
1605 static void ocfs2_xa_block_wipe_namevalue(struct ocfs2_xa_loc *loc)
1606 {
1607         int i, offset;
1608         int namevalue_offset, first_namevalue_offset, namevalue_size;
1609         struct ocfs2_xattr_entry *entry = loc->xl_entry;
1610         struct ocfs2_xattr_header *xh = loc->xl_header;
1611         int count = le16_to_cpu(xh->xh_count);
1612
1613         namevalue_offset = le16_to_cpu(entry->xe_name_offset);
1614         namevalue_size = namevalue_size_xe(entry);
1615         first_namevalue_offset = ocfs2_xa_get_free_start(loc);
1616
1617         /* Shift the name+value pairs */
1618         memmove((char *)xh + first_namevalue_offset + namevalue_size,
1619                 (char *)xh + first_namevalue_offset,
1620                 namevalue_offset - first_namevalue_offset);
1621         memset((char *)xh + first_namevalue_offset, 0, namevalue_size);
1622
1623         /* Now tell xh->xh_entries about it */
1624         for (i = 0; i < count; i++) {
1625                 offset = le16_to_cpu(xh->xh_entries[i].xe_name_offset);
1626                 if (offset <= namevalue_offset)
1627                         le16_add_cpu(&xh->xh_entries[i].xe_name_offset,
1628                                      namevalue_size);
1629         }
1630
1631         /*
1632          * Note that we don't update xh_free_start or xh_name_value_len
1633          * because they're not used in block-stored xattrs.
1634          */
1635 }
1636
1637 static void ocfs2_xa_block_add_entry(struct ocfs2_xa_loc *loc, u32 name_hash)
1638 {
1639         int count = le16_to_cpu(loc->xl_header->xh_count);
1640         loc->xl_entry = &(loc->xl_header->xh_entries[count]);
1641         le16_add_cpu(&loc->xl_header->xh_count, 1);
1642         memset(loc->xl_entry, 0, sizeof(struct ocfs2_xattr_entry));
1643 }
1644
1645 static void ocfs2_xa_block_add_namevalue(struct ocfs2_xa_loc *loc, int size)
1646 {
1647         int free_start = ocfs2_xa_get_free_start(loc);
1648
1649         loc->xl_entry->xe_name_offset = cpu_to_le16(free_start - size);
1650 }
1651
1652 static void ocfs2_xa_block_fill_value_buf(struct ocfs2_xa_loc *loc,
1653                                           struct ocfs2_xattr_value_buf *vb)
1654 {
1655         struct buffer_head *bh = loc->xl_storage;
1656
1657         if (loc->xl_size == (bh->b_size -
1658                              offsetof(struct ocfs2_xattr_block,
1659                                       xb_attrs.xb_header)))
1660                 vb->vb_access = ocfs2_journal_access_xb;
1661         else
1662                 vb->vb_access = ocfs2_journal_access_di;
1663         vb->vb_bh = bh;
1664 }
1665
1666 /*
1667  * Operations for xattrs stored in blocks.  This includes inline inode
1668  * storage and unindexed ocfs2_xattr_blocks.
1669  */
1670 static const struct ocfs2_xa_loc_operations ocfs2_xa_block_loc_ops = {
1671         .xlo_journal_access     = ocfs2_xa_block_journal_access,
1672         .xlo_journal_dirty      = ocfs2_xa_block_journal_dirty,
1673         .xlo_offset_pointer     = ocfs2_xa_block_offset_pointer,
1674         .xlo_check_space        = ocfs2_xa_block_check_space,
1675         .xlo_can_reuse          = ocfs2_xa_block_can_reuse,
1676         .xlo_get_free_start     = ocfs2_xa_block_get_free_start,
1677         .xlo_wipe_namevalue     = ocfs2_xa_block_wipe_namevalue,
1678         .xlo_add_entry          = ocfs2_xa_block_add_entry,
1679         .xlo_add_namevalue      = ocfs2_xa_block_add_namevalue,
1680         .xlo_fill_value_buf     = ocfs2_xa_block_fill_value_buf,
1681 };
1682
1683 static int ocfs2_xa_bucket_journal_access(handle_t *handle,
1684                                           struct ocfs2_xa_loc *loc, int type)
1685 {
1686         struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1687
1688         return ocfs2_xattr_bucket_journal_access(handle, bucket, type);
1689 }
1690
1691 static void ocfs2_xa_bucket_journal_dirty(handle_t *handle,
1692                                           struct ocfs2_xa_loc *loc)
1693 {
1694         struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1695
1696         ocfs2_xattr_bucket_journal_dirty(handle, bucket);
1697 }
1698
1699 static void *ocfs2_xa_bucket_offset_pointer(struct ocfs2_xa_loc *loc,
1700                                             int offset)
1701 {
1702         struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1703         int block, block_offset;
1704
1705         /* The header is at the front of the bucket */
1706         block = offset >> loc->xl_inode->i_sb->s_blocksize_bits;
1707         block_offset = offset % loc->xl_inode->i_sb->s_blocksize;
1708
1709         return bucket_block(bucket, block) + block_offset;
1710 }
1711
1712 static int ocfs2_xa_bucket_can_reuse(struct ocfs2_xa_loc *loc,
1713                                      struct ocfs2_xattr_info *xi)
1714 {
1715         return namevalue_size_xe(loc->xl_entry) >=
1716                 namevalue_size_xi(xi);
1717 }
1718
1719 static int ocfs2_xa_bucket_get_free_start(struct ocfs2_xa_loc *loc)
1720 {
1721         struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1722         return le16_to_cpu(bucket_xh(bucket)->xh_free_start);
1723 }
1724
1725 static int ocfs2_bucket_align_free_start(struct super_block *sb,
1726                                          int free_start, int size)
1727 {
1728         /*
1729          * We need to make sure that the name+value pair fits within
1730          * one block.
1731          */
1732         if (((free_start - size) >> sb->s_blocksize_bits) !=
1733             ((free_start - 1) >> sb->s_blocksize_bits))
1734                 free_start -= free_start % sb->s_blocksize;
1735
1736         return free_start;
1737 }
1738
1739 static int ocfs2_xa_bucket_check_space(struct ocfs2_xa_loc *loc,
1740                                        struct ocfs2_xattr_info *xi)
1741 {
1742         int rc;
1743         int count = le16_to_cpu(loc->xl_header->xh_count);
1744         int free_start = ocfs2_xa_get_free_start(loc);
1745         int needed_space = ocfs2_xi_entry_usage(xi);
1746         int size = namevalue_size_xi(xi);
1747         struct super_block *sb = loc->xl_inode->i_sb;
1748
1749         /*
1750          * Bucket storage does not reclaim name+value pairs it cannot
1751          * reuse.  They live as holes until the bucket fills, and then
1752          * the bucket is defragmented.  However, the bucket can reclaim
1753          * the ocfs2_xattr_entry.
1754          */
1755         if (loc->xl_entry) {
1756                 /* Don't need space if we're reusing! */
1757                 if (ocfs2_xa_can_reuse_entry(loc, xi))
1758                         needed_space = 0;
1759                 else
1760                         needed_space -= sizeof(struct ocfs2_xattr_entry);
1761         }
1762         BUG_ON(needed_space < 0);
1763
1764         if (free_start < size) {
1765                 if (needed_space)
1766                         return -ENOSPC;
1767         } else {
1768                 /*
1769                  * First we check if it would fit in the first place.
1770                  * Below, we align the free start to a block.  This may
1771                  * slide us below the minimum gap.  By checking unaligned
1772                  * first, we avoid that error.
1773                  */
1774                 rc = ocfs2_xa_check_space_helper(needed_space, free_start,
1775                                                  count);
1776                 if (rc)
1777                         return rc;
1778                 free_start = ocfs2_bucket_align_free_start(sb, free_start,
1779                                                            size);
1780         }
1781         return ocfs2_xa_check_space_helper(needed_space, free_start, count);
1782 }
1783
1784 static void ocfs2_xa_bucket_wipe_namevalue(struct ocfs2_xa_loc *loc)
1785 {
1786         le16_add_cpu(&loc->xl_header->xh_name_value_len,
1787                      -namevalue_size_xe(loc->xl_entry));
1788 }
1789
1790 static void ocfs2_xa_bucket_add_entry(struct ocfs2_xa_loc *loc, u32 name_hash)
1791 {
1792         struct ocfs2_xattr_header *xh = loc->xl_header;
1793         int count = le16_to_cpu(xh->xh_count);
1794         int low = 0, high = count - 1, tmp;
1795         struct ocfs2_xattr_entry *tmp_xe;
1796
1797         /*
1798          * We keep buckets sorted by name_hash, so we need to find
1799          * our insert place.
1800          */
1801         while (low <= high && count) {
1802                 tmp = (low + high) / 2;
1803                 tmp_xe = &xh->xh_entries[tmp];
1804
1805                 if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
1806                         low = tmp + 1;
1807                 else if (name_hash < le32_to_cpu(tmp_xe->xe_name_hash))
1808                         high = tmp - 1;
1809                 else {
1810                         low = tmp;
1811                         break;
1812                 }
1813         }
1814
1815         if (low != count)
1816                 memmove(&xh->xh_entries[low + 1],
1817                         &xh->xh_entries[low],
1818                         ((count - low) * sizeof(struct ocfs2_xattr_entry)));
1819
1820         le16_add_cpu(&xh->xh_count, 1);
1821         loc->xl_entry = &xh->xh_entries[low];
1822         memset(loc->xl_entry, 0, sizeof(struct ocfs2_xattr_entry));
1823 }
1824
1825 static void ocfs2_xa_bucket_add_namevalue(struct ocfs2_xa_loc *loc, int size)
1826 {
1827         int free_start = ocfs2_xa_get_free_start(loc);
1828         struct ocfs2_xattr_header *xh = loc->xl_header;
1829         struct super_block *sb = loc->xl_inode->i_sb;
1830         int nameval_offset;
1831
1832         free_start = ocfs2_bucket_align_free_start(sb, free_start, size);
1833         nameval_offset = free_start - size;
1834         loc->xl_entry->xe_name_offset = cpu_to_le16(nameval_offset);
1835         xh->xh_free_start = cpu_to_le16(nameval_offset);
1836         le16_add_cpu(&xh->xh_name_value_len, size);
1837
1838 }
1839
1840 static void ocfs2_xa_bucket_fill_value_buf(struct ocfs2_xa_loc *loc,
1841                                            struct ocfs2_xattr_value_buf *vb)
1842 {
1843         struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1844         struct super_block *sb = loc->xl_inode->i_sb;
1845         int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1846         int size = namevalue_size_xe(loc->xl_entry);
1847         int block_offset = nameval_offset >> sb->s_blocksize_bits;
1848
1849         /* Values are not allowed to straddle block boundaries */
1850         BUG_ON(block_offset !=
1851                ((nameval_offset + size - 1) >> sb->s_blocksize_bits));
1852         /* We expect the bucket to be filled in */
1853         BUG_ON(!bucket->bu_bhs[block_offset]);
1854
1855         vb->vb_access = ocfs2_journal_access;
1856         vb->vb_bh = bucket->bu_bhs[block_offset];
1857 }
1858
1859 /* Operations for xattrs stored in buckets. */
1860 static const struct ocfs2_xa_loc_operations ocfs2_xa_bucket_loc_ops = {
1861         .xlo_journal_access     = ocfs2_xa_bucket_journal_access,
1862         .xlo_journal_dirty      = ocfs2_xa_bucket_journal_dirty,
1863         .xlo_offset_pointer     = ocfs2_xa_bucket_offset_pointer,
1864         .xlo_check_space        = ocfs2_xa_bucket_check_space,
1865         .xlo_can_reuse          = ocfs2_xa_bucket_can_reuse,
1866         .xlo_get_free_start     = ocfs2_xa_bucket_get_free_start,
1867         .xlo_wipe_namevalue     = ocfs2_xa_bucket_wipe_namevalue,
1868         .xlo_add_entry          = ocfs2_xa_bucket_add_entry,
1869         .xlo_add_namevalue      = ocfs2_xa_bucket_add_namevalue,
1870         .xlo_fill_value_buf     = ocfs2_xa_bucket_fill_value_buf,
1871 };
1872
1873 static unsigned int ocfs2_xa_value_clusters(struct ocfs2_xa_loc *loc)
1874 {
1875         struct ocfs2_xattr_value_buf vb;
1876
1877         if (ocfs2_xattr_is_local(loc->xl_entry))
1878                 return 0;
1879
1880         ocfs2_xa_fill_value_buf(loc, &vb);
1881         return le32_to_cpu(vb.vb_xv->xr_clusters);
1882 }
1883
1884 static int ocfs2_xa_value_truncate(struct ocfs2_xa_loc *loc, u64 bytes,
1885                                    struct ocfs2_xattr_set_ctxt *ctxt)
1886 {
1887         int trunc_rc, access_rc;
1888         struct ocfs2_xattr_value_buf vb;
1889
1890         ocfs2_xa_fill_value_buf(loc, &vb);
1891         trunc_rc = ocfs2_xattr_value_truncate(loc->xl_inode, &vb, bytes,
1892                                               ctxt);
1893
1894         /*
1895          * The caller of ocfs2_xa_value_truncate() has already called
1896          * ocfs2_xa_journal_access on the loc.  However, The truncate code
1897          * calls ocfs2_extend_trans().  This may commit the previous
1898          * transaction and open a new one.  If this is a bucket, truncate
1899          * could leave only vb->vb_bh set up for journaling.  Meanwhile,
1900          * the caller is expecting to dirty the entire bucket.  So we must
1901          * reset the journal work.  We do this even if truncate has failed,
1902          * as it could have failed after committing the extend.
1903          */
1904         access_rc = ocfs2_xa_journal_access(ctxt->handle, loc,
1905                                             OCFS2_JOURNAL_ACCESS_WRITE);
1906
1907         /* Errors in truncate take precedence */
1908         return trunc_rc ? trunc_rc : access_rc;
1909 }
1910
1911 static void ocfs2_xa_remove_entry(struct ocfs2_xa_loc *loc)
1912 {
1913         int index, count;
1914         struct ocfs2_xattr_header *xh = loc->xl_header;
1915         struct ocfs2_xattr_entry *entry = loc->xl_entry;
1916
1917         ocfs2_xa_wipe_namevalue(loc);
1918         loc->xl_entry = NULL;
1919
1920         le16_add_cpu(&xh->xh_count, -1);
1921         count = le16_to_cpu(xh->xh_count);
1922
1923         /*
1924          * Only zero out the entry if there are more remaining.  This is
1925          * important for an empty bucket, as it keeps track of the
1926          * bucket's hash value.  It doesn't hurt empty block storage.
1927          */
1928         if (count) {
1929                 index = ((char *)entry - (char *)&xh->xh_entries) /
1930                         sizeof(struct ocfs2_xattr_entry);
1931                 memmove(&xh->xh_entries[index], &xh->xh_entries[index + 1],
1932                         (count - index) * sizeof(struct ocfs2_xattr_entry));
1933                 memset(&xh->xh_entries[count], 0,
1934                        sizeof(struct ocfs2_xattr_entry));
1935         }
1936 }
1937
1938 /*
1939  * If we have a problem adjusting the size of an external value during
1940  * ocfs2_xa_prepare_entry() or ocfs2_xa_remove(), we may have an xattr
1941  * in an intermediate state.  For example, the value may be partially
1942  * truncated.
1943  *
1944  * If the value tree hasn't changed, the extend/truncate went nowhere.
1945  * We have nothing to do.  The caller can treat it as a straight error.
1946  *
1947  * If the value tree got partially truncated, we now have a corrupted
1948  * extended attribute.  We're going to wipe its entry and leak the
1949  * clusters.  Better to leak some storage than leave a corrupt entry.
1950  *
1951  * If the value tree grew, it obviously didn't grow enough for the
1952  * new entry.  We're not going to try and reclaim those clusters either.
1953  * If there was already an external value there (orig_clusters != 0),
1954  * the new clusters are attached safely and we can just leave the old
1955  * value in place.  If there was no external value there, we remove
1956  * the entry.
1957  *
1958  * This way, the xattr block we store in the journal will be consistent.
1959  * If the size change broke because of the journal, no changes will hit
1960  * disk anyway.
1961  */
1962 static void ocfs2_xa_cleanup_value_truncate(struct ocfs2_xa_loc *loc,
1963                                             const char *what,
1964                                             unsigned int orig_clusters)
1965 {
1966         unsigned int new_clusters = ocfs2_xa_value_clusters(loc);
1967         char *nameval_buf = ocfs2_xa_offset_pointer(loc,
1968                                 le16_to_cpu(loc->xl_entry->xe_name_offset));
1969
1970         if (new_clusters < orig_clusters) {
1971                 mlog(ML_ERROR,
1972                      "Partial truncate while %s xattr %.*s.  Leaking "
1973                      "%u clusters and removing the entry\n",
1974                      what, loc->xl_entry->xe_name_len, nameval_buf,
1975                      orig_clusters - new_clusters);
1976                 ocfs2_xa_remove_entry(loc);
1977         } else if (!orig_clusters) {
1978                 mlog(ML_ERROR,
1979                      "Unable to allocate an external value for xattr "
1980                      "%.*s safely.  Leaking %u clusters and removing the "
1981                      "entry\n",
1982                      loc->xl_entry->xe_name_len, nameval_buf,
1983                      new_clusters - orig_clusters);
1984                 ocfs2_xa_remove_entry(loc);
1985         } else if (new_clusters > orig_clusters)
1986                 mlog(ML_ERROR,
1987                      "Unable to grow xattr %.*s safely.  %u new clusters "
1988                      "have been added, but the value will not be "
1989                      "modified\n",
1990                      loc->xl_entry->xe_name_len, nameval_buf,
1991                      new_clusters - orig_clusters);
1992 }
1993
1994 static int ocfs2_xa_remove(struct ocfs2_xa_loc *loc,
1995                            struct ocfs2_xattr_set_ctxt *ctxt)
1996 {
1997         int rc = 0;
1998         unsigned int orig_clusters;
1999
2000         if (!ocfs2_xattr_is_local(loc->xl_entry)) {
2001                 orig_clusters = ocfs2_xa_value_clusters(loc);
2002                 rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2003                 if (rc) {
2004                         mlog_errno(rc);
2005                         /*
2006                          * Since this is remove, we can return 0 if
2007                          * ocfs2_xa_cleanup_value_truncate() is going to
2008                          * wipe the entry anyway.  So we check the
2009                          * cluster count as well.
2010                          */
2011                         if (orig_clusters != ocfs2_xa_value_clusters(loc))
2012                                 rc = 0;
2013                         ocfs2_xa_cleanup_value_truncate(loc, "removing",
2014                                                         orig_clusters);
2015                         if (rc)
2016                                 goto out;
2017                 }
2018         }
2019
2020         ocfs2_xa_remove_entry(loc);
2021
2022 out:
2023         return rc;
2024 }
2025
2026 static void ocfs2_xa_install_value_root(struct ocfs2_xa_loc *loc)
2027 {
2028         int name_size = OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len);
2029         char *nameval_buf;
2030
2031         nameval_buf = ocfs2_xa_offset_pointer(loc,
2032                                 le16_to_cpu(loc->xl_entry->xe_name_offset));
2033         memcpy(nameval_buf + name_size, &def_xv, OCFS2_XATTR_ROOT_SIZE);
2034 }
2035
2036 /*
2037  * Take an existing entry and make it ready for the new value.  This
2038  * won't allocate space, but it may free space.  It should be ready for
2039  * ocfs2_xa_prepare_entry() to finish the work.
2040  */
2041 static int ocfs2_xa_reuse_entry(struct ocfs2_xa_loc *loc,
2042                                 struct ocfs2_xattr_info *xi,
2043                                 struct ocfs2_xattr_set_ctxt *ctxt)
2044 {
2045         int rc = 0;
2046         int name_size = OCFS2_XATTR_SIZE(xi->xi_name_len);
2047         unsigned int orig_clusters;
2048         char *nameval_buf;
2049         int xe_local = ocfs2_xattr_is_local(loc->xl_entry);
2050         int xi_local = xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE;
2051
2052         BUG_ON(OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len) !=
2053                name_size);
2054
2055         nameval_buf = ocfs2_xa_offset_pointer(loc,
2056                                 le16_to_cpu(loc->xl_entry->xe_name_offset));
2057         if (xe_local) {
2058                 memset(nameval_buf + name_size, 0,
2059                        namevalue_size_xe(loc->xl_entry) - name_size);
2060                 if (!xi_local)
2061                         ocfs2_xa_install_value_root(loc);
2062         } else {
2063                 orig_clusters = ocfs2_xa_value_clusters(loc);
2064                 if (xi_local) {
2065                         rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2066                         if (rc < 0)
2067                                 mlog_errno(rc);
2068                         else
2069                                 memset(nameval_buf + name_size, 0,
2070                                        namevalue_size_xe(loc->xl_entry) -
2071                                        name_size);
2072                 } else if (le64_to_cpu(loc->xl_entry->xe_value_size) >
2073                            xi->xi_value_len) {
2074                         rc = ocfs2_xa_value_truncate(loc, xi->xi_value_len,
2075                                                      ctxt);
2076                         if (rc < 0)
2077                                 mlog_errno(rc);
2078                 }
2079
2080                 if (rc) {
2081                         ocfs2_xa_cleanup_value_truncate(loc, "reusing",
2082                                                         orig_clusters);
2083                         goto out;
2084                 }
2085         }
2086
2087         loc->xl_entry->xe_value_size = cpu_to_le64(xi->xi_value_len);
2088         ocfs2_xattr_set_local(loc->xl_entry, xi_local);
2089
2090 out:
2091         return rc;
2092 }
2093
2094 /*
2095  * Prepares loc->xl_entry to receive the new xattr.  This includes
2096  * properly setting up the name+value pair region.  If loc->xl_entry
2097  * already exists, it will take care of modifying it appropriately.
2098  *
2099  * Note that this modifies the data.  You did journal_access already,
2100  * right?
2101  */
2102 static int ocfs2_xa_prepare_entry(struct ocfs2_xa_loc *loc,
2103                                   struct ocfs2_xattr_info *xi,
2104                                   u32 name_hash,
2105                                   struct ocfs2_xattr_set_ctxt *ctxt)
2106 {
2107         int rc = 0;
2108         unsigned int orig_clusters;
2109         __le64 orig_value_size = 0;
2110
2111         rc = ocfs2_xa_check_space(loc, xi);
2112         if (rc)
2113                 goto out;
2114
2115         if (loc->xl_entry) {
2116                 if (ocfs2_xa_can_reuse_entry(loc, xi)) {
2117                         orig_value_size = loc->xl_entry->xe_value_size;
2118                         rc = ocfs2_xa_reuse_entry(loc, xi, ctxt);
2119                         if (rc)
2120                                 goto out;
2121                         goto alloc_value;
2122                 }
2123
2124                 if (!ocfs2_xattr_is_local(loc->xl_entry)) {
2125                         orig_clusters = ocfs2_xa_value_clusters(loc);
2126                         rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2127                         if (rc) {
2128                                 mlog_errno(rc);
2129                                 ocfs2_xa_cleanup_value_truncate(loc,
2130                                                                 "overwriting",
2131                                                                 orig_clusters);
2132                                 goto out;
2133                         }
2134                 }
2135                 ocfs2_xa_wipe_namevalue(loc);
2136         } else
2137                 ocfs2_xa_add_entry(loc, name_hash);
2138
2139         /*
2140          * If we get here, we have a blank entry.  Fill it.  We grow our
2141          * name+value pair back from the end.
2142          */
2143         ocfs2_xa_add_namevalue(loc, xi);
2144         if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE)
2145                 ocfs2_xa_install_value_root(loc);
2146
2147 alloc_value:
2148         if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
2149                 orig_clusters = ocfs2_xa_value_clusters(loc);
2150                 rc = ocfs2_xa_value_truncate(loc, xi->xi_value_len, ctxt);
2151                 if (rc < 0) {
2152                         ctxt->set_abort = 1;
2153                         ocfs2_xa_cleanup_value_truncate(loc, "growing",
2154                                                         orig_clusters);
2155                         /*
2156                          * If we were growing an existing value,
2157                          * ocfs2_xa_cleanup_value_truncate() won't remove
2158                          * the entry. We need to restore the original value
2159                          * size.
2160                          */
2161                         if (loc->xl_entry) {
2162                                 BUG_ON(!orig_value_size);
2163                                 loc->xl_entry->xe_value_size = orig_value_size;
2164                         }
2165                         mlog_errno(rc);
2166                 }
2167         }
2168
2169 out:
2170         return rc;
2171 }
2172
2173 /*
2174  * Store the value portion of the name+value pair.  This will skip
2175  * values that are stored externally.  Their tree roots were set up
2176  * by ocfs2_xa_prepare_entry().
2177  */
2178 static int ocfs2_xa_store_value(struct ocfs2_xa_loc *loc,
2179                                 struct ocfs2_xattr_info *xi,
2180                                 struct ocfs2_xattr_set_ctxt *ctxt)
2181 {
2182         int rc = 0;
2183         int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
2184         int name_size = OCFS2_XATTR_SIZE(xi->xi_name_len);
2185         char *nameval_buf;
2186         struct ocfs2_xattr_value_buf vb;
2187
2188         nameval_buf = ocfs2_xa_offset_pointer(loc, nameval_offset);
2189         if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
2190                 ocfs2_xa_fill_value_buf(loc, &vb);
2191                 rc = __ocfs2_xattr_set_value_outside(loc->xl_inode,
2192                                                      ctxt->handle, &vb,
2193                                                      xi->xi_value,
2194                                                      xi->xi_value_len);
2195         } else
2196                 memcpy(nameval_buf + name_size, xi->xi_value, xi->xi_value_len);
2197
2198         return rc;
2199 }
2200
2201 static int ocfs2_xa_set(struct ocfs2_xa_loc *loc,
2202                         struct ocfs2_xattr_info *xi,
2203                         struct ocfs2_xattr_set_ctxt *ctxt)
2204 {
2205         int ret;
2206         u32 name_hash = ocfs2_xattr_name_hash(loc->xl_inode, xi->xi_name,
2207                                               xi->xi_name_len);
2208
2209         ret = ocfs2_xa_journal_access(ctxt->handle, loc,
2210                                       OCFS2_JOURNAL_ACCESS_WRITE);
2211         if (ret) {
2212                 mlog_errno(ret);
2213                 goto out;
2214         }
2215
2216         /*
2217          * From here on out, everything is going to modify the buffer a
2218          * little.  Errors are going to leave the xattr header in a
2219          * sane state.  Thus, even with errors we dirty the sucker.
2220          */
2221
2222         /* Don't worry, we are never called with !xi_value and !xl_entry */
2223         if (!xi->xi_value) {
2224                 ret = ocfs2_xa_remove(loc, ctxt);
2225                 goto out_dirty;
2226         }
2227
2228         ret = ocfs2_xa_prepare_entry(loc, xi, name_hash, ctxt);
2229         if (ret) {
2230                 if (ret != -ENOSPC)
2231                         mlog_errno(ret);
2232                 goto out_dirty;
2233         }
2234
2235         ret = ocfs2_xa_store_value(loc, xi, ctxt);
2236         if (ret)
2237                 mlog_errno(ret);
2238
2239 out_dirty:
2240         ocfs2_xa_journal_dirty(ctxt->handle, loc);
2241
2242 out:
2243         return ret;
2244 }
2245
2246 static void ocfs2_init_dinode_xa_loc(struct ocfs2_xa_loc *loc,
2247                                      struct inode *inode,
2248                                      struct buffer_head *bh,
2249                                      struct ocfs2_xattr_entry *entry)
2250 {
2251         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
2252
2253         BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_XATTR_FL));
2254
2255         loc->xl_inode = inode;
2256         loc->xl_ops = &ocfs2_xa_block_loc_ops;
2257         loc->xl_storage = bh;
2258         loc->xl_entry = entry;
2259         loc->xl_size = le16_to_cpu(di->i_xattr_inline_size);
2260         loc->xl_header =
2261                 (struct ocfs2_xattr_header *)(bh->b_data + bh->b_size -
2262                                               loc->xl_size);
2263 }
2264
2265 static void ocfs2_init_xattr_block_xa_loc(struct ocfs2_xa_loc *loc,
2266                                           struct inode *inode,
2267                                           struct buffer_head *bh,
2268                                           struct ocfs2_xattr_entry *entry)
2269 {
2270         struct ocfs2_xattr_block *xb =
2271                 (struct ocfs2_xattr_block *)bh->b_data;
2272
2273         BUG_ON(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED);
2274
2275         loc->xl_inode = inode;
2276         loc->xl_ops = &ocfs2_xa_block_loc_ops;
2277         loc->xl_storage = bh;
2278         loc->xl_header = &(xb->xb_attrs.xb_header);
2279         loc->xl_entry = entry;
2280         loc->xl_size = bh->b_size - offsetof(struct ocfs2_xattr_block,
2281                                              xb_attrs.xb_header);
2282 }
2283
2284 static void ocfs2_init_xattr_bucket_xa_loc(struct ocfs2_xa_loc *loc,
2285                                            struct ocfs2_xattr_bucket *bucket,
2286                                            struct ocfs2_xattr_entry *entry)
2287 {
2288         loc->xl_inode = bucket->bu_inode;
2289         loc->xl_ops = &ocfs2_xa_bucket_loc_ops;
2290         loc->xl_storage = bucket;
2291         loc->xl_header = bucket_xh(bucket);
2292         loc->xl_entry = entry;
2293         loc->xl_size = OCFS2_XATTR_BUCKET_SIZE;
2294 }
2295
2296 /*
2297  * In xattr remove, if it is stored outside and refcounted, we may have
2298  * the chance to split the refcount tree. So need the allocators.
2299  */
2300 static int ocfs2_lock_xattr_remove_allocators(struct inode *inode,
2301                                         struct ocfs2_xattr_value_root *xv,
2302                                         struct ocfs2_caching_info *ref_ci,
2303                                         struct buffer_head *ref_root_bh,
2304                                         struct ocfs2_alloc_context **meta_ac,
2305                                         int *ref_credits)
2306 {
2307         int ret, meta_add = 0;
2308         u32 p_cluster, num_clusters;
2309         unsigned int ext_flags;
2310
2311         *ref_credits = 0;
2312         ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
2313                                        &num_clusters,
2314                                        &xv->xr_list,
2315                                        &ext_flags);
2316         if (ret) {
2317                 mlog_errno(ret);
2318                 goto out;
2319         }
2320
2321         if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
2322                 goto out;
2323
2324         ret = ocfs2_refcounted_xattr_delete_need(inode, ref_ci,
2325                                                  ref_root_bh, xv,
2326                                                  &meta_add, ref_credits);
2327         if (ret) {
2328                 mlog_errno(ret);
2329                 goto out;
2330         }
2331
2332         ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb),
2333                                                 meta_add, meta_ac);
2334         if (ret)
2335                 mlog_errno(ret);
2336
2337 out:
2338         return ret;
2339 }
2340
2341 static int ocfs2_remove_value_outside(struct inode*inode,
2342                                       struct ocfs2_xattr_value_buf *vb,
2343                                       struct ocfs2_xattr_header *header,
2344                                       struct ocfs2_caching_info *ref_ci,
2345                                       struct buffer_head *ref_root_bh)
2346 {
2347         int ret = 0, i, ref_credits;
2348         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2349         struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
2350         void *val;
2351
2352         ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
2353
2354         for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
2355                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
2356
2357                 if (ocfs2_xattr_is_local(entry))
2358                         continue;
2359
2360                 val = (void *)header +
2361                         le16_to_cpu(entry->xe_name_offset);
2362                 vb->vb_xv = (struct ocfs2_xattr_value_root *)
2363                         (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
2364
2365                 ret = ocfs2_lock_xattr_remove_allocators(inode, vb->vb_xv,
2366                                                          ref_ci, ref_root_bh,
2367                                                          &ctxt.meta_ac,
2368                                                          &ref_credits);
2369
2370                 ctxt.handle = ocfs2_start_trans(osb, ref_credits +
2371                                         ocfs2_remove_extent_credits(osb->sb));
2372                 if (IS_ERR(ctxt.handle)) {
2373                         ret = PTR_ERR(ctxt.handle);
2374                         mlog_errno(ret);
2375                         break;
2376                 }
2377
2378                 ret = ocfs2_xattr_value_truncate(inode, vb, 0, &ctxt);
2379
2380                 ocfs2_commit_trans(osb, ctxt.handle);
2381                 if (ctxt.meta_ac) {
2382                         ocfs2_free_alloc_context(ctxt.meta_ac);
2383                         ctxt.meta_ac = NULL;
2384                 }
2385
2386                 if (ret < 0) {
2387                         mlog_errno(ret);
2388                         break;
2389                 }
2390
2391         }
2392
2393         if (ctxt.meta_ac)
2394                 ocfs2_free_alloc_context(ctxt.meta_ac);
2395         ocfs2_schedule_truncate_log_flush(osb, 1);
2396         ocfs2_run_deallocs(osb, &ctxt.dealloc);
2397         return ret;
2398 }
2399
2400 static int ocfs2_xattr_ibody_remove(struct inode *inode,
2401                                     struct buffer_head *di_bh,
2402                                     struct ocfs2_caching_info *ref_ci,
2403                                     struct buffer_head *ref_root_bh)
2404 {
2405
2406         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2407         struct ocfs2_xattr_header *header;
2408         int ret;
2409         struct ocfs2_xattr_value_buf vb = {
2410                 .vb_bh = di_bh,
2411                 .vb_access = ocfs2_journal_access_di,
2412         };
2413
2414         header = (struct ocfs2_xattr_header *)
2415                  ((void *)di + inode->i_sb->s_blocksize -
2416                  le16_to_cpu(di->i_xattr_inline_size));
2417
2418         ret = ocfs2_remove_value_outside(inode, &vb, header,
2419                                          ref_ci, ref_root_bh);
2420
2421         return ret;
2422 }
2423
2424 struct ocfs2_rm_xattr_bucket_para {
2425         struct ocfs2_caching_info *ref_ci;
2426         struct buffer_head *ref_root_bh;
2427 };
2428
2429 static int ocfs2_xattr_block_remove(struct inode *inode,
2430                                     struct buffer_head *blk_bh,
2431                                     struct ocfs2_caching_info *ref_ci,
2432                                     struct buffer_head *ref_root_bh)
2433 {
2434         struct ocfs2_xattr_block *xb;
2435         int ret = 0;
2436         struct ocfs2_xattr_value_buf vb = {
2437                 .vb_bh = blk_bh,
2438                 .vb_access = ocfs2_journal_access_xb,
2439         };
2440         struct ocfs2_rm_xattr_bucket_para args = {
2441                 .ref_ci = ref_ci,
2442                 .ref_root_bh = ref_root_bh,
2443         };
2444
2445         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2446         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2447                 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
2448                 ret = ocfs2_remove_value_outside(inode, &vb, header,
2449                                                  ref_ci, ref_root_bh);
2450         } else
2451                 ret = ocfs2_iterate_xattr_index_block(inode,
2452                                                 blk_bh,
2453                                                 ocfs2_rm_xattr_cluster,
2454                                                 &args);
2455
2456         return ret;
2457 }
2458
2459 static int ocfs2_xattr_free_block(struct inode *inode,
2460                                   u64 block,
2461                                   struct ocfs2_caching_info *ref_ci,
2462                                   struct buffer_head *ref_root_bh)
2463 {
2464         struct inode *xb_alloc_inode;
2465         struct buffer_head *xb_alloc_bh = NULL;
2466         struct buffer_head *blk_bh = NULL;
2467         struct ocfs2_xattr_block *xb;
2468         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2469         handle_t *handle;
2470         int ret = 0;
2471         u64 blk, bg_blkno;
2472         u16 bit;
2473
2474         ret = ocfs2_read_xattr_block(inode, block, &blk_bh);
2475         if (ret < 0) {
2476                 mlog_errno(ret);
2477                 goto out;
2478         }
2479
2480         ret = ocfs2_xattr_block_remove(inode, blk_bh, ref_ci, ref_root_bh);
2481         if (ret < 0) {
2482                 mlog_errno(ret);
2483                 goto out;
2484         }
2485
2486         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2487         blk = le64_to_cpu(xb->xb_blkno);
2488         bit = le16_to_cpu(xb->xb_suballoc_bit);
2489         if (xb->xb_suballoc_loc)
2490                 bg_blkno = le64_to_cpu(xb->xb_suballoc_loc);
2491         else
2492                 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
2493
2494         xb_alloc_inode = ocfs2_get_system_file_inode(osb,
2495                                 EXTENT_ALLOC_SYSTEM_INODE,
2496                                 le16_to_cpu(xb->xb_suballoc_slot));
2497         if (!xb_alloc_inode) {
2498                 ret = -ENOMEM;
2499                 mlog_errno(ret);
2500                 goto out;
2501         }
2502         mutex_lock(&xb_alloc_inode->i_mutex);
2503
2504         ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
2505         if (ret < 0) {
2506                 mlog_errno(ret);
2507                 goto out_mutex;
2508         }
2509
2510         handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
2511         if (IS_ERR(handle)) {
2512                 ret = PTR_ERR(handle);
2513                 mlog_errno(ret);
2514                 goto out_unlock;
2515         }
2516
2517         ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
2518                                        bit, bg_blkno, 1);
2519         if (ret < 0)
2520                 mlog_errno(ret);
2521
2522         ocfs2_commit_trans(osb, handle);
2523 out_unlock:
2524         ocfs2_inode_unlock(xb_alloc_inode, 1);
2525         brelse(xb_alloc_bh);
2526 out_mutex:
2527         mutex_unlock(&xb_alloc_inode->i_mutex);
2528         iput(xb_alloc_inode);
2529 out:
2530         brelse(blk_bh);
2531         return ret;
2532 }
2533
2534 /*
2535  * ocfs2_xattr_remove()
2536  *
2537  * Free extended attribute resources associated with this inode.
2538  */
2539 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
2540 {
2541         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2542         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2543         struct ocfs2_refcount_tree *ref_tree = NULL;
2544         struct buffer_head *ref_root_bh = NULL;
2545         struct ocfs2_caching_info *ref_ci = NULL;
2546         handle_t *handle;
2547         int ret;
2548
2549         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2550                 return 0;
2551
2552         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
2553                 return 0;
2554
2555         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) {
2556                 ret = ocfs2_lock_refcount_tree(OCFS2_SB(inode->i_sb),
2557                                                le64_to_cpu(di->i_refcount_loc),
2558                                                1, &ref_tree, &ref_root_bh);
2559                 if (ret) {
2560                         mlog_errno(ret);
2561                         goto out;
2562                 }
2563                 ref_ci = &ref_tree->rf_ci;
2564
2565         }
2566
2567         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2568                 ret = ocfs2_xattr_ibody_remove(inode, di_bh,
2569                                                ref_ci, ref_root_bh);
2570                 if (ret < 0) {
2571                         mlog_errno(ret);
2572                         goto out;
2573                 }
2574         }
2575
2576         if (di->i_xattr_loc) {
2577                 ret = ocfs2_xattr_free_block(inode,
2578                                              le64_to_cpu(di->i_xattr_loc),
2579                                              ref_ci, ref_root_bh);
2580                 if (ret < 0) {
2581                         mlog_errno(ret);
2582                         goto out;
2583                 }
2584         }
2585
2586         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
2587                                    OCFS2_INODE_UPDATE_CREDITS);
2588         if (IS_ERR(handle)) {
2589                 ret = PTR_ERR(handle);
2590                 mlog_errno(ret);
2591                 goto out;
2592         }
2593         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
2594                                       OCFS2_JOURNAL_ACCESS_WRITE);
2595         if (ret) {
2596                 mlog_errno(ret);
2597                 goto out_commit;
2598         }
2599
2600         di->i_xattr_loc = 0;
2601
2602         spin_lock(&oi->ip_lock);
2603         oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
2604         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
2605         spin_unlock(&oi->ip_lock);
2606
2607         ocfs2_journal_dirty(handle, di_bh);
2608 out_commit:
2609         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
2610 out:
2611         if (ref_tree)
2612                 ocfs2_unlock_refcount_tree(OCFS2_SB(inode->i_sb), ref_tree, 1);
2613         brelse(ref_root_bh);
2614         return ret;
2615 }
2616
2617 static int ocfs2_xattr_has_space_inline(struct inode *inode,
2618                                         struct ocfs2_dinode *di)
2619 {
2620         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2621         unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
2622         int free;
2623
2624         if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
2625                 return 0;
2626
2627         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2628                 struct ocfs2_inline_data *idata = &di->id2.i_data;
2629                 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
2630         } else if (ocfs2_inode_is_fast_symlink(inode)) {
2631                 free = ocfs2_fast_symlink_chars(inode->i_sb) -
2632                         le64_to_cpu(di->i_size);
2633         } else {
2634                 struct ocfs2_extent_list *el = &di->id2.i_list;
2635                 free = (le16_to_cpu(el->l_count) -
2636                         le16_to_cpu(el->l_next_free_rec)) *
2637                         sizeof(struct ocfs2_extent_rec);
2638         }
2639         if (free >= xattrsize)
2640                 return 1;
2641
2642         return 0;
2643 }
2644
2645 /*
2646  * ocfs2_xattr_ibody_find()
2647  *
2648  * Find extended attribute in inode block and
2649  * fill search info into struct ocfs2_xattr_search.
2650  */
2651 static int ocfs2_xattr_ibody_find(struct inode *inode,
2652                                   int name_index,
2653                                   const char *name,
2654                                   struct ocfs2_xattr_search *xs)
2655 {
2656         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2657         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2658         int ret;
2659         int has_space = 0;
2660
2661         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2662                 return 0;
2663
2664         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2665                 down_read(&oi->ip_alloc_sem);
2666                 has_space = ocfs2_xattr_has_space_inline(inode, di);
2667                 up_read(&oi->ip_alloc_sem);
2668                 if (!has_space)
2669                         return 0;
2670         }
2671
2672         xs->xattr_bh = xs->inode_bh;
2673         xs->end = (void *)di + inode->i_sb->s_blocksize;
2674         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
2675                 xs->header = (struct ocfs2_xattr_header *)
2676                         (xs->end - le16_to_cpu(di->i_xattr_inline_size));
2677         else
2678                 xs->header = (struct ocfs2_xattr_header *)
2679                         (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
2680         xs->base = (void *)xs->header;
2681         xs->here = xs->header->xh_entries;
2682
2683         /* Find the named attribute. */
2684         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2685                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2686                 if (ret && ret != -ENODATA)
2687                         return ret;
2688                 xs->not_found = ret;
2689         }
2690
2691         return 0;
2692 }
2693
2694 static int ocfs2_xattr_ibody_init(struct inode *inode,
2695                                   struct buffer_head *di_bh,
2696                                   struct ocfs2_xattr_set_ctxt *ctxt)
2697 {
2698         int ret;
2699         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2700         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2701         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2702         unsigned int xattrsize = osb->s_xattr_inline_size;
2703
2704         if (!ocfs2_xattr_has_space_inline(inode, di)) {
2705                 ret = -ENOSPC;
2706                 goto out;
2707         }
2708
2709         ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode), di_bh,
2710                                       OCFS2_JOURNAL_ACCESS_WRITE);
2711         if (ret) {
2712                 mlog_errno(ret);
2713                 goto out;
2714         }
2715
2716         /*
2717          * Adjust extent record count or inline data size
2718          * to reserve space for extended attribute.
2719          */
2720         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2721                 struct ocfs2_inline_data *idata = &di->id2.i_data;
2722                 le16_add_cpu(&idata->id_count, -xattrsize);
2723         } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
2724                 struct ocfs2_extent_list *el = &di->id2.i_list;
2725                 le16_add_cpu(&el->l_count, -(xattrsize /
2726                                              sizeof(struct ocfs2_extent_rec)));
2727         }
2728         di->i_xattr_inline_size = cpu_to_le16(xattrsize);
2729
2730         spin_lock(&oi->ip_lock);
2731         oi->ip_dyn_features |= OCFS2_INLINE_XATTR_FL|OCFS2_HAS_XATTR_FL;
2732         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
2733         spin_unlock(&oi->ip_lock);
2734
2735         ocfs2_journal_dirty(ctxt->handle, di_bh);
2736
2737 out:
2738         return ret;
2739 }
2740
2741 /*
2742  * ocfs2_xattr_ibody_set()
2743  *
2744  * Set, replace or remove an extended attribute into inode block.
2745  *
2746  */
2747 static int ocfs2_xattr_ibody_set(struct inode *inode,
2748                                  struct ocfs2_xattr_info *xi,
2749                                  struct ocfs2_xattr_search *xs,
2750                                  struct ocfs2_xattr_set_ctxt *ctxt)
2751 {
2752         int ret;
2753         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2754         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2755         struct ocfs2_xa_loc loc;
2756
2757         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2758                 return -ENOSPC;
2759
2760         down_write(&oi->ip_alloc_sem);
2761         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2762                 if (!ocfs2_xattr_has_space_inline(inode, di)) {
2763                         ret = -ENOSPC;
2764                         goto out;
2765                 }
2766         }
2767
2768         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2769                 ret = ocfs2_xattr_ibody_init(inode, xs->inode_bh, ctxt);
2770                 if (ret) {
2771                         if (ret != -ENOSPC)
2772                                 mlog_errno(ret);
2773                         goto out;
2774                 }
2775         }
2776
2777         ocfs2_init_dinode_xa_loc(&loc, inode, xs->inode_bh,
2778                                  xs->not_found ? NULL : xs->here);
2779         ret = ocfs2_xa_set(&loc, xi, ctxt);
2780         if (ret) {
2781                 if (ret != -ENOSPC)
2782                         mlog_errno(ret);
2783                 goto out;
2784         }
2785         xs->here = loc.xl_entry;
2786
2787 out:
2788         up_write(&oi->ip_alloc_sem);
2789
2790         return ret;
2791 }
2792
2793 /*
2794  * ocfs2_xattr_block_find()
2795  *
2796  * Find extended attribute in external block and
2797  * fill search info into struct ocfs2_xattr_search.
2798  */
2799 static int ocfs2_xattr_block_find(struct inode *inode,
2800                                   int name_index,
2801                                   const char *name,
2802                                   struct ocfs2_xattr_search *xs)
2803 {
2804         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2805         struct buffer_head *blk_bh = NULL;
2806         struct ocfs2_xattr_block *xb;
2807         int ret = 0;
2808
2809         if (!di->i_xattr_loc)
2810                 return ret;
2811
2812         ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
2813                                      &blk_bh);
2814         if (ret < 0) {
2815                 mlog_errno(ret);
2816                 return ret;
2817         }
2818
2819         xs->xattr_bh = blk_bh;
2820         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2821
2822         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2823                 xs->header = &xb->xb_attrs.xb_header;
2824                 xs->base = (void *)xs->header;
2825                 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
2826                 xs->here = xs->header->xh_entries;
2827
2828                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2829         } else
2830                 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
2831                                                    name_index,
2832                                                    name, xs);
2833
2834         if (ret && ret != -ENODATA) {
2835                 xs->xattr_bh = NULL;
2836                 goto cleanup;
2837         }
2838         xs->not_found = ret;
2839         return 0;
2840 cleanup:
2841         brelse(blk_bh);
2842
2843         return ret;
2844 }
2845
2846 static int ocfs2_create_xattr_block(struct inode *inode,
2847                                     struct buffer_head *inode_bh,
2848                                     struct ocfs2_xattr_set_ctxt *ctxt,
2849                                     int indexed,
2850                                     struct buffer_head **ret_bh)
2851 {
2852         int ret;
2853         u16 suballoc_bit_start;
2854         u32 num_got;
2855         u64 suballoc_loc, first_blkno;
2856         struct ocfs2_dinode *di =  (struct ocfs2_dinode *)inode_bh->b_data;
2857         struct buffer_head *new_bh = NULL;
2858         struct ocfs2_xattr_block *xblk;
2859
2860         ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
2861                                       inode_bh, OCFS2_JOURNAL_ACCESS_CREATE);
2862         if (ret < 0) {
2863                 mlog_errno(ret);
2864                 goto end;
2865         }
2866
2867         ret = ocfs2_claim_metadata(ctxt->handle, ctxt->meta_ac, 1,
2868                                    &suballoc_loc, &suballoc_bit_start,
2869                                    &num_got, &first_blkno);
2870         if (ret < 0) {
2871                 mlog_errno(ret);
2872                 goto end;
2873         }
2874
2875         new_bh = sb_getblk(inode->i_sb, first_blkno);
2876         ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), new_bh);
2877
2878         ret = ocfs2_journal_access_xb(ctxt->handle, INODE_CACHE(inode),
2879                                       new_bh,
2880                                       OCFS2_JOURNAL_ACCESS_CREATE);
2881         if (ret < 0) {
2882                 mlog_errno(ret);
2883                 goto end;
2884         }
2885
2886         /* Initialize ocfs2_xattr_block */
2887         xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
2888         memset(xblk, 0, inode->i_sb->s_blocksize);
2889         strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
2890         xblk->xb_suballoc_slot = cpu_to_le16(ctxt->meta_ac->ac_alloc_slot);
2891         xblk->xb_suballoc_loc = cpu_to_le64(suballoc_loc);
2892         xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
2893         xblk->xb_fs_generation =
2894                 cpu_to_le32(OCFS2_SB(inode->i_sb)->fs_generation);
2895         xblk->xb_blkno = cpu_to_le64(first_blkno);
2896         if (indexed) {
2897                 struct ocfs2_xattr_tree_root *xr = &xblk->xb_attrs.xb_root;
2898                 xr->xt_clusters = cpu_to_le32(1);
2899                 xr->xt_last_eb_blk = 0;
2900                 xr->xt_list.l_tree_depth = 0;
2901                 xr->xt_list.l_count = cpu_to_le16(
2902                                         ocfs2_xattr_recs_per_xb(inode->i_sb));
2903                 xr->xt_list.l_next_free_rec = cpu_to_le16(1);
2904                 xblk->xb_flags = cpu_to_le16(OCFS2_XATTR_INDEXED);
2905         }
2906         ocfs2_journal_dirty(ctxt->handle, new_bh);
2907
2908         /* Add it to the inode */
2909         di->i_xattr_loc = cpu_to_le64(first_blkno);
2910
2911         spin_lock(&OCFS2_I(inode)->ip_lock);
2912         OCFS2_I(inode)->ip_dyn_features |= OCFS2_HAS_XATTR_FL;
2913         di->i_dyn_features = cpu_to_le16(OCFS2_I(inode)->ip_dyn_features);
2914         spin_unlock(&OCFS2_I(inode)->ip_lock);
2915
2916         ocfs2_journal_dirty(ctxt->handle, inode_bh);
2917
2918         *ret_bh = new_bh;
2919         new_bh = NULL;
2920
2921 end:
2922         brelse(new_bh);
2923         return ret;
2924 }
2925
2926 /*
2927  * ocfs2_xattr_block_set()
2928  *
2929  * Set, replace or remove an extended attribute into external block.
2930  *
2931  */
2932 static int ocfs2_xattr_block_set(struct inode *inode,
2933                                  struct ocfs2_xattr_info *xi,
2934                                  struct ocfs2_xattr_search *xs,
2935                                  struct ocfs2_xattr_set_ctxt *ctxt)
2936 {
2937         struct buffer_head *new_bh = NULL;
2938         struct ocfs2_xattr_block *xblk = NULL;
2939         int ret;
2940         struct ocfs2_xa_loc loc;
2941
2942         if (!xs->xattr_bh) {
2943                 ret = ocfs2_create_xattr_block(inode, xs->inode_bh, ctxt,
2944                                                0, &new_bh);
2945                 if (ret) {
2946                         mlog_errno(ret);
2947                         goto end;
2948                 }
2949
2950                 xs->xattr_bh = new_bh;
2951                 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2952                 xs->header = &xblk->xb_attrs.xb_header;
2953                 xs->base = (void *)xs->header;
2954                 xs->end = (void *)xblk + inode->i_sb->s_blocksize;
2955                 xs->here = xs->header->xh_entries;
2956         } else
2957                 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2958
2959         if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
2960                 ocfs2_init_xattr_block_xa_loc(&loc, inode, xs->xattr_bh,
2961                                               xs->not_found ? NULL : xs->here);
2962
2963                 ret = ocfs2_xa_set(&loc, xi, ctxt);
2964                 if (!ret)
2965                         xs->here = loc.xl_entry;
2966                 else if ((ret != -ENOSPC) || ctxt->set_abort)
2967                         goto end;
2968                 else {
2969                         ret = ocfs2_xattr_create_index_block(inode, xs, ctxt);
2970                         if (ret)
2971                                 goto end;
2972                 }
2973         }
2974
2975         if (le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)
2976                 ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs, ctxt);
2977
2978 end:
2979         return ret;
2980 }
2981
2982 /* Check whether the new xattr can be inserted into the inode. */
2983 static int ocfs2_xattr_can_be_in_inode(struct inode *inode,
2984                                        struct ocfs2_xattr_info *xi,
2985                                        struct ocfs2_xattr_search *xs)
2986 {
2987         struct ocfs2_xattr_entry *last;
2988         int free, i;
2989         size_t min_offs = xs->end - xs->base;
2990
2991         if (!xs->header)
2992                 return 0;
2993
2994         last = xs->header->xh_entries;
2995
2996         for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
2997                 size_t offs = le16_to_cpu(last->xe_name_offset);
2998                 if (offs < min_offs)
2999                         min_offs = offs;
3000                 last += 1;
3001         }
3002
3003         free = min_offs - ((void *)last - xs->base) - OCFS2_XATTR_HEADER_GAP;
3004         if (free < 0)
3005                 return 0;
3006
3007         BUG_ON(!xs->not_found);
3008
3009         if (free >= (sizeof(struct ocfs2_xattr_entry) + namevalue_size_xi(xi)))
3010                 return 1;
3011
3012         return 0;
3013 }
3014
3015 static int ocfs2_calc_xattr_set_need(struct inode *inode,
3016                                      struct ocfs2_dinode *di,
3017                                      struct ocfs2_xattr_info *xi,
3018                                      struct ocfs2_xattr_search *xis,
3019                                      struct ocfs2_xattr_search *xbs,
3020                                      int *clusters_need,
3021                                      int *meta_need,
3022                                      int *credits_need)
3023 {
3024         int ret = 0, old_in_xb = 0;
3025         int clusters_add = 0, meta_add = 0, credits = 0;
3026         struct buffer_head *bh = NULL;
3027         struct ocfs2_xattr_block *xb = NULL;
3028         struct ocfs2_xattr_entry *xe = NULL;
3029         struct ocfs2_xattr_value_root *xv = NULL;
3030         char *base = NULL;
3031         int name_offset, name_len = 0;
3032         u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
3033                                                     xi->xi_value_len);
3034         u64 value_size;
3035
3036         /*
3037          * Calculate the clusters we need to write.
3038          * No matter whether we replace an old one or add a new one,
3039          * we need this for writing.
3040          */
3041         if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE)
3042                 credits += new_clusters *
3043                            ocfs2_clusters_to_blocks(inode->i_sb, 1);
3044
3045         if (xis->not_found && xbs->not_found) {
3046                 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3047
3048                 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3049                         clusters_add += new_clusters;
3050                         credits += ocfs2_calc_extend_credits(inode->i_sb,
3051                                                         &def_xv.xv.xr_list,
3052                                                         new_clusters);
3053                 }
3054
3055                 goto meta_guess;
3056         }
3057
3058         if (!xis->not_found) {
3059                 xe = xis->here;
3060                 name_offset = le16_to_cpu(xe->xe_name_offset);
3061                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3062                 base = xis->base;
3063                 credits += OCFS2_INODE_UPDATE_CREDITS;
3064         } else {
3065                 int i, block_off = 0;
3066                 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
3067                 xe = xbs->here;
3068                 name_offset = le16_to_cpu(xe->xe_name_offset);
3069                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3070                 i = xbs->here - xbs->header->xh_entries;
3071                 old_in_xb = 1;
3072
3073                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
3074                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3075                                                         bucket_xh(xbs->bucket),
3076                                                         i, &block_off,
3077                                                         &name_offset);
3078                         base = bucket_block(xbs->bucket, block_off);
3079                         credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3080                 } else {
3081                         base = xbs->base;
3082                         credits += OCFS2_XATTR_BLOCK_UPDATE_CREDITS;
3083                 }
3084         }
3085
3086         /*
3087          * delete a xattr doesn't need metadata and cluster allocation.
3088          * so just calculate the credits and return.
3089          *
3090          * The credits for removing the value tree will be extended
3091          * by ocfs2_remove_extent itself.
3092          */
3093         if (!xi->xi_value) {
3094                 if (!ocfs2_xattr_is_local(xe))
3095                         credits += ocfs2_remove_extent_credits(inode->i_sb);
3096
3097                 goto out;
3098         }
3099
3100         /* do cluster allocation guess first. */
3101         value_size = le64_to_cpu(xe->xe_value_size);
3102
3103         if (old_in_xb) {
3104                 /*
3105                  * In xattr set, we always try to set the xe in inode first,
3106                  * so if it can be inserted into inode successfully, the old
3107                  * one will be removed from the xattr block, and this xattr
3108                  * will be inserted into inode as a new xattr in inode.
3109                  */
3110                 if (ocfs2_xattr_can_be_in_inode(inode, xi, xis)) {
3111                         clusters_add += new_clusters;
3112                         credits += ocfs2_remove_extent_credits(inode->i_sb) +
3113                                     OCFS2_INODE_UPDATE_CREDITS;
3114                         if (!ocfs2_xattr_is_local(xe))
3115                                 credits += ocfs2_calc_extend_credits(
3116                                                         inode->i_sb,
3117                                                         &def_xv.xv.xr_list,
3118                                                         new_clusters);
3119                         goto out;
3120                 }
3121         }
3122
3123         if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3124                 /* the new values will be stored outside. */
3125                 u32 old_clusters = 0;
3126
3127                 if (!ocfs2_xattr_is_local(xe)) {
3128                         old_clusters =  ocfs2_clusters_for_bytes(inode->i_sb,
3129                                                                  value_size);
3130                         xv = (struct ocfs2_xattr_value_root *)
3131                              (base + name_offset + name_len);
3132                         value_size = OCFS2_XATTR_ROOT_SIZE;
3133                 } else
3134                         xv = &def_xv.xv;
3135
3136                 if (old_clusters >= new_clusters) {
3137                         credits += ocfs2_remove_extent_credits(inode->i_sb);
3138                         goto out;
3139                 } else {
3140                         meta_add += ocfs2_extend_meta_needed(&xv->xr_list);
3141                         clusters_add += new_clusters - old_clusters;
3142                         credits += ocfs2_calc_extend_credits(inode->i_sb,
3143                                                              &xv->xr_list,
3144                                                              new_clusters -
3145                                                              old_clusters);
3146                         if (value_size >= OCFS2_XATTR_ROOT_SIZE)
3147                                 goto out;
3148                 }
3149         } else {
3150                 /*
3151                  * Now the new value will be stored inside. So if the new
3152                  * value is smaller than the size of value root or the old
3153                  * value, we don't need any allocation, otherwise we have
3154                  * to guess metadata allocation.
3155                  */
3156                 if ((ocfs2_xattr_is_local(xe) &&
3157                      (value_size >= xi->xi_value_len)) ||
3158                     (!ocfs2_xattr_is_local(xe) &&
3159                      OCFS2_XATTR_ROOT_SIZE >= xi->xi_value_len))
3160                         goto out;
3161         }
3162
3163 meta_guess:
3164         /* calculate metadata allocation. */
3165         if (di->i_xattr_loc) {
3166                 if (!xbs->xattr_bh) {
3167                         ret = ocfs2_read_xattr_block(inode,
3168                                                      le64_to_cpu(di->i_xattr_loc),
3169                                                      &bh);
3170                         if (ret) {
3171                                 mlog_errno(ret);
3172                                 goto out;
3173                         }
3174
3175                         xb = (struct ocfs2_xattr_block *)bh->b_data;
3176                 } else
3177                         xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
3178
3179                 /*
3180                  * If there is already an xattr tree, good, we can calculate
3181                  * like other b-trees. Otherwise we may have the chance of
3182                  * create a tree, the credit calculation is borrowed from
3183                  * ocfs2_calc_extend_credits with root_el = NULL. And the
3184                  * new tree will be cluster based, so no meta is needed.
3185                  */
3186                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
3187                         struct ocfs2_extent_list *el =
3188                                  &xb->xb_attrs.xb_root.xt_list;
3189                         meta_add += ocfs2_extend_meta_needed(el);
3190                         credits += ocfs2_calc_extend_credits(inode->i_sb,
3191                                                              el, 1);
3192                 } else
3193                         credits += OCFS2_SUBALLOC_ALLOC + 1;
3194
3195                 /*
3196                  * This cluster will be used either for new bucket or for
3197                  * new xattr block.
3198                  * If the cluster size is the same as the bucket size, one
3199                  * more is needed since we may need to extend the bucket
3200                  * also.
3201                  */
3202                 clusters_add += 1;
3203                 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3204                 if (OCFS2_XATTR_BUCKET_SIZE ==
3205                         OCFS2_SB(inode->i_sb)->s_clustersize) {
3206                         credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3207                         clusters_add += 1;
3208                 }
3209         } else {
3210                 meta_add += 1;
3211                 credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
3212         }
3213 out:
3214         if (clusters_need)
3215                 *clusters_need = clusters_add;
3216         if (meta_need)
3217                 *meta_need = meta_add;
3218         if (credits_need)
3219                 *credits_need = credits;
3220         brelse(bh);
3221         return ret;
3222 }
3223
3224 static int ocfs2_init_xattr_set_ctxt(struct inode *inode,
3225                                      struct ocfs2_dinode *di,
3226                                      struct ocfs2_xattr_info *xi,
3227                                      struct ocfs2_xattr_search *xis,
3228                                      struct ocfs2_xattr_search *xbs,
3229                                      struct ocfs2_xattr_set_ctxt *ctxt,
3230                                      int extra_meta,
3231                                      int *credits)
3232 {
3233         int clusters_add, meta_add, ret;
3234         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3235
3236         memset(ctxt, 0, sizeof(struct ocfs2_xattr_set_ctxt));
3237
3238         ocfs2_init_dealloc_ctxt(&ctxt->dealloc);
3239
3240         ret = ocfs2_calc_xattr_set_need(inode, di, xi, xis, xbs,
3241                                         &clusters_add, &meta_add, credits);
3242         if (ret) {
3243                 mlog_errno(ret);
3244                 return ret;
3245         }
3246
3247         meta_add += extra_meta;
3248         trace_ocfs2_init_xattr_set_ctxt(xi->xi_name, meta_add,
3249                                         clusters_add, *credits);
3250
3251         if (meta_add) {
3252                 ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add,
3253                                                         &ctxt->meta_ac);
3254                 if (ret) {
3255                         mlog_errno(ret);
3256                         goto out;
3257                 }
3258         }
3259
3260         if (clusters_add) {
3261                 ret = ocfs2_reserve_clusters(osb, clusters_add, &ctxt->data_ac);
3262                 if (ret)
3263                         mlog_errno(ret);
3264         }
3265 out:
3266         if (ret) {
3267                 if (ctxt->meta_ac) {
3268                         ocfs2_free_alloc_context(ctxt->meta_ac);
3269                         ctxt->meta_ac = NULL;
3270                 }
3271
3272                 /*
3273                  * We cannot have an error and a non null ctxt->data_ac.
3274                  */
3275         }
3276
3277         return ret;
3278 }
3279
3280 static int __ocfs2_xattr_set_handle(struct inode *inode,
3281                                     struct ocfs2_dinode *di,
3282                                     struct ocfs2_xattr_info *xi,
3283                                     struct ocfs2_xattr_search *xis,
3284                                     struct ocfs2_xattr_search *xbs,
3285                                     struct ocfs2_xattr_set_ctxt *ctxt)
3286 {
3287         int ret = 0, credits, old_found;
3288
3289         if (!xi->xi_value) {
3290                 /* Remove existing extended attribute */
3291                 if (!xis->not_found)
3292                         ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
3293                 else if (!xbs->not_found)
3294                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3295         } else {
3296                 /* We always try to set extended attribute into inode first*/
3297                 ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
3298                 if (!ret && !xbs->not_found) {
3299                         /*
3300                          * If succeed and that extended attribute existing in
3301                          * external block, then we will remove it.
3302                          */
3303                         xi->xi_value = NULL;
3304                         xi->xi_value_len = 0;
3305
3306                         old_found = xis->not_found;
3307                         xis->not_found = -ENODATA;
3308                         ret = ocfs2_calc_xattr_set_need(inode,
3309                                                         di,
3310                                                         xi,
3311                                                         xis,
3312                                                         xbs,
3313                                                         NULL,
3314                                                         NULL,
3315                                                         &credits);
3316                         xis->not_found = old_found;
3317                         if (ret) {
3318                                 mlog_errno(ret);
3319                                 goto out;
3320                         }
3321
3322                         ret = ocfs2_extend_trans(ctxt->handle, credits);
3323                         if (ret) {
3324                                 mlog_errno(ret);
3325                                 goto out;
3326                         }
3327                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3328                 } else if ((ret == -ENOSPC) && !ctxt->set_abort) {
3329                         if (di->i_xattr_loc && !xbs->xattr_bh) {
3330                                 ret = ocfs2_xattr_block_find(inode,
3331                                                              xi->xi_name_index,
3332                                                              xi->xi_name, xbs);
3333                                 if (ret)
3334                                         goto out;
3335
3336                                 old_found = xis->not_found;
3337                                 xis->not_found = -ENODATA;
3338                                 ret = ocfs2_calc_xattr_set_need(inode,
3339                                                                 di,
3340                                                                 xi,
3341                                                                 xis,
3342                                                                 xbs,
3343                                                                 NULL,
3344                                                                 NULL,
3345                                                                 &credits);
3346                                 xis->not_found = old_found;
3347                                 if (ret) {
3348                                         mlog_errno(ret);
3349                                         goto out;
3350                                 }
3351
3352                                 ret = ocfs2_extend_trans(ctxt->handle, credits);
3353                                 if (ret) {
3354                                         mlog_errno(ret);
3355                                         goto out;
3356                                 }
3357                         }
3358                         /*
3359                          * If no space in inode, we will set extended attribute
3360                          * into external block.
3361                          */
3362                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3363                         if (ret)
3364                                 goto out;
3365                         if (!xis->not_found) {
3366                                 /*
3367                                  * If succeed and that extended attribute
3368                                  * existing in inode, we will remove it.
3369                                  */
3370                                 xi->xi_value = NULL;
3371                                 xi->xi_value_len = 0;
3372                                 xbs->not_found = -ENODATA;
3373                                 ret = ocfs2_calc_xattr_set_need(inode,
3374                                                                 di,
3375                                                                 xi,
3376                                                                 xis,
3377                                                                 xbs,
3378                                                                 NULL,
3379                                                                 NULL,
3380                                                                 &credits);
3381                                 if (ret) {
3382                                         mlog_errno(ret);
3383                                         goto out;
3384                                 }
3385
3386                                 ret = ocfs2_extend_trans(ctxt->handle, credits);
3387                                 if (ret) {
3388                                         mlog_errno(ret);
3389                                         goto out;
3390                                 }
3391                                 ret = ocfs2_xattr_ibody_set(inode, xi,
3392                                                             xis, ctxt);
3393                         }
3394                 }
3395         }
3396
3397         if (!ret) {
3398                 /* Update inode ctime. */
3399                 ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
3400                                               xis->inode_bh,
3401                                               OCFS2_JOURNAL_ACCESS_WRITE);
3402                 if (ret) {
3403                         mlog_errno(ret);
3404                         goto out;
3405                 }
3406
3407                 inode->i_ctime = CURRENT_TIME;
3408                 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
3409                 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
3410                 ocfs2_journal_dirty(ctxt->handle, xis->inode_bh);
3411         }
3412 out:
3413         return ret;
3414 }
3415
3416 /*
3417  * This function only called duing creating inode
3418  * for init security/acl xattrs of the new inode.
3419  * All transanction credits have been reserved in mknod.
3420  */
3421 int ocfs2_xattr_set_handle(handle_t *handle,
3422                            struct inode *inode,
3423                            struct buffer_head *di_bh,
3424                            int name_index,
3425                            const char *name,
3426                            const void *value,
3427                            size_t value_len,
3428                            int flags,
3429                            struct ocfs2_alloc_context *meta_ac,
3430                            struct ocfs2_alloc_context *data_ac)
3431 {
3432         struct ocfs2_dinode *di;
3433         int ret;
3434
3435         struct ocfs2_xattr_info xi = {
3436                 .xi_name_index = name_index,
3437                 .xi_name = name,
3438                 .xi_name_len = strlen(name),
3439                 .xi_value = value,
3440                 .xi_value_len = value_len,
3441         };
3442
3443         struct ocfs2_xattr_search xis = {
3444                 .not_found = -ENODATA,
3445         };
3446
3447         struct ocfs2_xattr_search xbs = {
3448                 .not_found = -ENODATA,
3449         };
3450
3451         struct ocfs2_xattr_set_ctxt ctxt = {
3452                 .handle = handle,
3453                 .meta_ac = meta_ac,
3454                 .data_ac = data_ac,
3455         };
3456
3457         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
3458                 return -EOPNOTSUPP;
3459
3460         /*
3461          * In extreme situation, may need xattr bucket when
3462          * block size is too small. And we have already reserved
3463          * the credits for bucket in mknod.
3464          */
3465         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) {
3466                 xbs.bucket = ocfs2_xattr_bucket_new(inode);
3467                 if (!xbs.bucket) {
3468                         mlog_errno(-ENOMEM);
3469                         return -ENOMEM;
3470                 }
3471         }
3472
3473         xis.inode_bh = xbs.inode_bh = di_bh;
3474         di = (struct ocfs2_dinode *)di_bh->b_data;
3475
3476         down_write(&OCFS2_I(inode)->ip_xattr_sem);
3477
3478         ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
3479         if (ret)
3480                 goto cleanup;
3481         if (xis.not_found) {
3482                 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
3483                 if (ret)
3484                         goto cleanup;
3485         }
3486
3487         ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
3488
3489 cleanup:
3490         up_write(&OCFS2_I(inode)->ip_xattr_sem);
3491         brelse(xbs.xattr_bh);
3492         ocfs2_xattr_bucket_free(xbs.bucket);
3493
3494         return ret;
3495 }
3496
3497 /*
3498  * ocfs2_xattr_set()
3499  *
3500  * Set, replace or remove an extended attribute for this inode.
3501  * value is NULL to remove an existing extended attribute, else either
3502  * create or replace an extended attribute.
3503  */
3504 int ocfs2_xattr_set(struct inode *inode,
3505                     int name_index,
3506                     const char *name,
3507                     const void *value,
3508                     size_t value_len,
3509                     int flags)
3510 {
3511         struct buffer_head *di_bh = NULL;
3512         struct ocfs2_dinode *di;
3513         int ret, credits, ref_meta = 0, ref_credits = 0;
3514         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3515         struct inode *tl_inode = osb->osb_tl_inode;
3516         struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
3517         struct ocfs2_refcount_tree *ref_tree = NULL;
3518
3519         struct ocfs2_xattr_info xi = {
3520                 .xi_name_index = name_index,
3521                 .xi_name = name,
3522                 .xi_name_len = strlen(name),
3523                 .xi_value = value,
3524                 .xi_value_len = value_len,
3525         };
3526
3527         struct ocfs2_xattr_search xis = {
3528                 .not_found = -ENODATA,
3529         };
3530
3531         struct ocfs2_xattr_search xbs = {
3532                 .not_found = -ENODATA,
3533         };
3534
3535         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
3536                 return -EOPNOTSUPP;
3537
3538         /*
3539          * Only xbs will be used on indexed trees.  xis doesn't need a
3540          * bucket.
3541          */
3542         xbs.bucket = ocfs2_xattr_bucket_new(inode);
3543         if (!xbs.bucket) {
3544                 mlog_errno(-ENOMEM);
3545                 return -ENOMEM;
3546         }
3547
3548         ret = ocfs2_inode_lock(inode, &di_bh, 1);
3549         if (ret < 0) {
3550                 mlog_errno(ret);
3551                 goto cleanup_nolock;
3552         }
3553         xis.inode_bh = xbs.inode_bh = di_bh;
3554         di = (struct ocfs2_dinode *)di_bh->b_data;
3555
3556         down_write(&OCFS2_I(inode)->ip_xattr_sem);
3557         /*
3558          * Scan inode and external block to find the same name
3559          * extended attribute and collect search information.
3560          */
3561         ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
3562         if (ret)
3563                 goto cleanup;
3564         if (xis.not_found) {
3565                 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
3566                 if (ret)
3567                         goto cleanup;
3568         }
3569
3570         if (xis.not_found && xbs.not_found) {
3571                 ret = -ENODATA;
3572                 if (flags & XATTR_REPLACE)
3573                         goto cleanup;
3574                 ret = 0;
3575                 if (!value)
3576                         goto cleanup;
3577         } else {
3578                 ret = -EEXIST;
3579                 if (flags & XATTR_CREATE)
3580                         goto cleanup;
3581         }
3582
3583         /* Check whether the value is refcounted and do some preparation. */
3584         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL &&
3585             (!xis.not_found || !xbs.not_found)) {
3586                 ret = ocfs2_prepare_refcount_xattr(inode, di, &xi,
3587                                                    &xis, &xbs, &ref_tree,
3588                                                    &ref_meta, &ref_credits);
3589                 if (ret) {
3590                         mlog_errno(ret);
3591                         goto cleanup;
3592                 }
3593         }
3594
3595         mutex_lock(&tl_inode->i_mutex);
3596
3597         if (ocfs2_truncate_log_needs_flush(osb)) {
3598                 ret = __ocfs2_flush_truncate_log(osb);
3599                 if (ret < 0) {
3600                         mutex_unlock(&tl_inode->i_mutex);
3601                         mlog_errno(ret);
3602                         goto cleanup;
3603                 }
3604         }
3605         mutex_unlock(&tl_inode->i_mutex);
3606
3607         ret = ocfs2_init_xattr_set_ctxt(inode, di, &xi, &xis,
3608                                         &xbs, &ctxt, ref_meta, &credits);
3609         if (ret) {
3610                 mlog_errno(ret);
3611                 goto cleanup;
3612         }
3613
3614         /* we need to update inode's ctime field, so add credit for it. */
3615         credits += OCFS2_INODE_UPDATE_CREDITS;
3616         ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
3617         if (IS_ERR(ctxt.handle)) {
3618                 ret = PTR_ERR(ctxt.handle);
3619                 mlog_errno(ret);
3620                 goto cleanup;
3621         }
3622
3623         ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
3624
3625         ocfs2_commit_trans(osb, ctxt.handle);
3626
3627         if (ctxt.data_ac)
3628                 ocfs2_free_alloc_context(ctxt.data_ac);
3629         if (ctxt.meta_ac)
3630                 ocfs2_free_alloc_context(ctxt.meta_ac);
3631         if (ocfs2_dealloc_has_cluster(&ctxt.dealloc))
3632                 ocfs2_schedule_truncate_log_flush(osb, 1);
3633         ocfs2_run_deallocs(osb, &ctxt.dealloc);
3634
3635 cleanup:
3636         if (ref_tree)
3637                 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3638         up_write(&OCFS2_I(inode)->ip_xattr_sem);
3639         if (!value && !ret) {
3640                 ret = ocfs2_try_remove_refcount_tree(inode, di_bh);
3641                 if (ret)
3642                         mlog_errno(ret);
3643         }
3644         ocfs2_inode_unlock(inode, 1);
3645 cleanup_nolock:
3646         brelse(di_bh);
3647         brelse(xbs.xattr_bh);
3648         ocfs2_xattr_bucket_free(xbs.bucket);
3649
3650         return ret;
3651 }
3652
3653 /*
3654  * Find the xattr extent rec which may contains name_hash.
3655  * e_cpos will be the first name hash of the xattr rec.
3656  * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
3657  */
3658 static int ocfs2_xattr_get_rec(struct inode *inode,
3659                                u32 name_hash,
3660                                u64 *p_blkno,
3661                                u32 *e_cpos,
3662                                u32 *num_clusters,
3663                                struct ocfs2_extent_list *el)
3664 {
3665         int ret = 0, i;
3666         struct buffer_head *eb_bh = NULL;
3667         struct ocfs2_extent_block *eb;
3668         struct ocfs2_extent_rec *rec = NULL;
3669         u64 e_blkno = 0;
3670
3671         if (el->l_tree_depth) {
3672                 ret = ocfs2_find_leaf(INODE_CACHE(inode), el, name_hash,
3673                                       &eb_bh);
3674                 if (ret) {
3675                         mlog_errno(ret);
3676                         goto out;
3677                 }
3678
3679                 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
3680                 el = &eb->h_list;
3681
3682                 if (el->l_tree_depth) {
3683                         ocfs2_error(inode->i_sb,
3684                                     "Inode %lu has non zero tree depth in "
3685                                     "xattr tree block %llu\n", inode->i_ino,
3686                                     (unsigned long long)eb_bh->b_blocknr);
3687                         ret = -EROFS;
3688                         goto out;
3689                 }
3690         }
3691
3692         for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
3693                 rec = &el->l_recs[i];
3694
3695                 if (le32_to_cpu(rec->e_cpos) <= name_hash) {
3696                         e_blkno = le64_to_cpu(rec->e_blkno);
3697                         break;
3698                 }
3699         }
3700
3701         if (!e_blkno) {
3702                 ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
3703                             "record (%u, %u, 0) in xattr", inode->i_ino,
3704                             le32_to_cpu(rec->e_cpos),
3705                             ocfs2_rec_clusters(el, rec));
3706                 ret = -EROFS;
3707                 goto out;
3708         }
3709
3710         *p_blkno = le64_to_cpu(rec->e_blkno);
3711         *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
3712         if (e_cpos)
3713                 *e_cpos = le32_to_cpu(rec->e_cpos);
3714 out:
3715         brelse(eb_bh);
3716         return ret;
3717 }
3718
3719 typedef int (xattr_bucket_func)(struct inode *inode,
3720                                 struct ocfs2_xattr_bucket *bucket,
3721                                 void *para);
3722
3723 static int ocfs2_find_xe_in_bucket(struct inode *inode,
3724                                    struct ocfs2_xattr_bucket *bucket,
3725                                    int name_index,
3726                                    const char *name,
3727                                    u32 name_hash,
3728                                    u16 *xe_index,
3729                                    int *found)
3730 {
3731         int i, ret = 0, cmp = 1, block_off, new_offset;
3732         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
3733         size_t name_len = strlen(name);
3734         struct ocfs2_xattr_entry *xe = NULL;
3735         char *xe_name;
3736
3737         /*
3738          * We don't use binary search in the bucket because there
3739          * may be multiple entries with the same name hash.
3740          */
3741         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3742                 xe = &xh->xh_entries[i];
3743
3744                 if (name_hash > le32_to_cpu(xe->xe_name_hash))
3745                         continue;
3746                 else if (name_hash < le32_to_cpu(xe->xe_name_hash))
3747                         break;
3748
3749                 cmp = name_index - ocfs2_xattr_get_type(xe);
3750                 if (!cmp)
3751                         cmp = name_len - xe->xe_name_len;
3752                 if (cmp)
3753                         continue;
3754
3755                 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3756                                                         xh,
3757                                                         i,
3758                                                         &block_off,
3759                                                         &new_offset);
3760                 if (ret) {
3761                         mlog_errno(ret);
3762                         break;
3763                 }
3764
3765
3766                 xe_name = bucket_block(bucket, block_off) + new_offset;
3767                 if (!memcmp(name, xe_name, name_len)) {
3768                         *xe_index = i;
3769                         *found = 1;
3770                         ret = 0;
3771                         break;
3772                 }
3773         }
3774
3775         return ret;
3776 }
3777
3778 /*
3779  * Find the specified xattr entry in a series of buckets.
3780  * This series start from p_blkno and last for num_clusters.
3781  * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
3782  * the num of the valid buckets.
3783  *
3784  * Return the buffer_head this xattr should reside in. And if the xattr's
3785  * hash is in the gap of 2 buckets, return the lower bucket.
3786  */
3787 static int ocfs2_xattr_bucket_find(struct inode *inode,
3788                                    int name_index,
3789                                    const char *name,
3790                                    u32 name_hash,
3791                                    u64 p_blkno,
3792                                    u32 first_hash,
3793                                    u32 num_clusters,
3794                                    struct ocfs2_xattr_search *xs)
3795 {
3796         int ret, found = 0;
3797         struct ocfs2_xattr_header *xh = NULL;
3798         struct ocfs2_xattr_entry *xe = NULL;
3799         u16 index = 0;
3800         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3801         int low_bucket = 0, bucket, high_bucket;
3802         struct ocfs2_xattr_bucket *search;
3803         u32 last_hash;
3804         u64 blkno, lower_blkno = 0;
3805
3806         search = ocfs2_xattr_bucket_new(inode);
3807         if (!search) {
3808                 ret = -ENOMEM;
3809                 mlog_errno(ret);
3810                 goto out;
3811         }
3812
3813         ret = ocfs2_read_xattr_bucket(search, p_blkno);
3814         if (ret) {
3815                 mlog_errno(ret);
3816                 goto out;
3817         }
3818
3819         xh = bucket_xh(search);
3820         high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
3821         while (low_bucket <= high_bucket) {
3822                 ocfs2_xattr_bucket_relse(search);
3823
3824                 bucket = (low_bucket + high_bucket) / 2;
3825                 blkno = p_blkno + bucket * blk_per_bucket;
3826                 ret = ocfs2_read_xattr_bucket(search, blkno);
3827                 if (ret) {
3828                         mlog_errno(ret);
3829                         goto out;
3830                 }
3831
3832                 xh = bucket_xh(search);
3833                 xe = &xh->xh_entries[0];
3834                 if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
3835                         high_bucket = bucket - 1;
3836                         continue;
3837                 }
3838
3839                 /*
3840                  * Check whether the hash of the last entry in our
3841                  * bucket is larger than the search one. for an empty
3842                  * bucket, the last one is also the first one.
3843                  */
3844                 if (xh->xh_count)
3845                         xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
3846
3847                 last_hash = le32_to_cpu(xe->xe_name_hash);
3848
3849                 /* record lower_blkno which may be the insert place. */
3850                 lower_blkno = blkno;
3851
3852                 if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
3853                         low_bucket = bucket + 1;
3854                         continue;
3855                 }
3856
3857                 /* the searched xattr should reside in this bucket if exists. */
3858                 ret = ocfs2_find_xe_in_bucket(inode, search,
3859                                               name_index, name, name_hash,
3860                                               &index, &found);
3861                 if (ret) {
3862                         mlog_errno(ret);
3863                         goto out;
3864                 }
3865                 break;
3866         }
3867
3868         /*
3869          * Record the bucket we have found.
3870          * When the xattr's hash value is in the gap of 2 buckets, we will
3871          * always set it to the previous bucket.
3872          */
3873         if (!lower_blkno)
3874                 lower_blkno = p_blkno;
3875
3876         /* This should be in cache - we just read it during the search */
3877         ret = ocfs2_read_xattr_bucket(xs->bucket, lower_blkno);
3878         if (ret) {
3879                 mlog_errno(ret);
3880                 goto out;
3881         }
3882
3883         xs->header = bucket_xh(xs->bucket);
3884         xs->base = bucket_block(xs->bucket, 0);
3885         xs->end = xs->base + inode->i_sb->s_blocksize;
3886
3887         if (found) {
3888                 xs->here = &xs->header->xh_entries[index];
3889                 trace_ocfs2_xattr_bucket_find(OCFS2_I(inode)->ip_blkno,
3890                         name, name_index, name_hash,
3891                         (unsigned long long)bucket_blkno(xs->bucket),
3892                         index);
3893         } else
3894                 ret = -ENODATA;
3895
3896 out:
3897         ocfs2_xattr_bucket_free(search);
3898         return ret;
3899 }
3900
3901 static int ocfs2_xattr_index_block_find(struct inode *inode,
3902                                         struct buffer_head *root_bh,
3903                                         int name_index,
3904                                         const char *name,
3905                                         struct ocfs2_xattr_search *xs)
3906 {
3907         int ret;
3908         struct ocfs2_xattr_block *xb =
3909                         (struct ocfs2_xattr_block *)root_bh->b_data;
3910         struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3911         struct ocfs2_extent_list *el = &xb_root->xt_list;
3912         u64 p_blkno = 0;
3913         u32 first_hash, num_clusters = 0;
3914         u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
3915
3916         if (le16_to_cpu(el->l_next_free_rec) == 0)
3917                 return -ENODATA;
3918
3919         trace_ocfs2_xattr_index_block_find(OCFS2_I(inode)->ip_blkno,
3920                                         name, name_index, name_hash,
3921                                         (unsigned long long)root_bh->b_blocknr,
3922                                         -1);
3923
3924         ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
3925                                   &num_clusters, el);
3926         if (ret) {
3927                 mlog_errno(ret);
3928                 goto out;
3929         }
3930
3931         BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
3932
3933         trace_ocfs2_xattr_index_block_find_rec(OCFS2_I(inode)->ip_blkno,
3934                                         name, name_index, first_hash,
3935                                         (unsigned long long)p_blkno,
3936                                         num_clusters);
3937
3938         ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
3939                                       p_blkno, first_hash, num_clusters, xs);
3940
3941 out:
3942         return ret;
3943 }
3944
3945 static int ocfs2_iterate_xattr_buckets(struct inode *inode,
3946                                        u64 blkno,
3947                                        u32 clusters,
3948                                        xattr_bucket_func *func,
3949                                        void *para)
3950 {
3951         int i, ret = 0;
3952         u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
3953         u32 num_buckets = clusters * bpc;
3954         struct ocfs2_xattr_bucket *bucket;
3955
3956         bucket = ocfs2_xattr_bucket_new(inode);
3957         if (!bucket) {
3958                 mlog_errno(-ENOMEM);
3959                 return -ENOMEM;
3960         }
3961
3962         trace_ocfs2_iterate_xattr_buckets(
3963                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
3964                 (unsigned long long)blkno, clusters);
3965
3966         for (i = 0; i < num_buckets; i++, blkno += bucket->bu_blocks) {
3967                 ret = ocfs2_read_xattr_bucket(bucket, blkno);
3968                 if (ret) {
3969                         mlog_errno(ret);
3970                         break;
3971                 }
3972
3973                 /*
3974                  * The real bucket num in this series of blocks is stored
3975                  * in the 1st bucket.
3976                  */
3977                 if (i == 0)
3978                         num_buckets = le16_to_cpu(bucket_xh(bucket)->xh_num_buckets);
3979
3980                 trace_ocfs2_iterate_xattr_bucket((unsigned long long)blkno,
3981                      le32_to_cpu(bucket_xh(bucket)->xh_entries[0].xe_name_hash));
3982                 if (func) {
3983                         ret = func(inode, bucket, para);
3984                         if (ret && ret != -ERANGE)
3985                                 mlog_errno(ret);
3986                         /* Fall through to bucket_relse() */
3987                 }
3988
3989                 ocfs2_xattr_bucket_relse(bucket);
3990                 if (ret)
3991                         break;
3992         }
3993
3994         ocfs2_xattr_bucket_free(bucket);
3995         return ret;
3996 }
3997
3998 struct ocfs2_xattr_tree_list {
3999         char *buffer;
4000         size_t buffer_size;
4001         size_t result;
4002 };
4003
4004 static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
4005                                              struct ocfs2_xattr_header *xh,
4006                                              int index,
4007                                              int *block_off,
4008                                              int *new_offset)
4009 {
4010         u16 name_offset;
4011
4012         if (index < 0 || index >= le16_to_cpu(xh->xh_count))
4013                 return -EINVAL;
4014
4015         name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
4016
4017         *block_off = name_offset >> sb->s_blocksize_bits;
4018         *new_offset = name_offset % sb->s_blocksize;
4019
4020         return 0;
4021 }
4022
4023 static int ocfs2_list_xattr_bucket(struct inode *inode,
4024                                    struct ocfs2_xattr_bucket *bucket,
4025                                    void *para)
4026 {
4027         int ret = 0, type;
4028         struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
4029         int i, block_off, new_offset;
4030         const char *prefix, *name;
4031
4032         for (i = 0 ; i < le16_to_cpu(bucket_xh(bucket)->xh_count); i++) {
4033                 struct ocfs2_xattr_entry *entry = &bucket_xh(bucket)->xh_entries[i];
4034                 type = ocfs2_xattr_get_type(entry);
4035                 prefix = ocfs2_xattr_prefix(type);
4036
4037                 if (prefix) {
4038                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
4039                                                                 bucket_xh(bucket),
4040                                                                 i,
4041                                                                 &block_off,
4042                                                                 &new_offset);
4043                         if (ret)
4044                                 break;
4045
4046                         name = (const char *)bucket_block(bucket, block_off) +
4047                                 new_offset;
4048                         ret = ocfs2_xattr_list_entry(xl->buffer,
4049                                                      xl->buffer_size,
4050                                                      &xl->result,
4051                                                      prefix, name,
4052                                                      entry->xe_name_len);
4053                         if (ret)
4054                                 break;
4055                 }
4056         }
4057
4058         return ret;
4059 }
4060
4061 static int ocfs2_iterate_xattr_index_block(struct inode *inode,
4062                                            struct buffer_head *blk_bh,
4063                                            xattr_tree_rec_func *rec_func,
4064                                            void *para)
4065 {
4066         struct ocfs2_xattr_block *xb =
4067                         (struct ocfs2_xattr_block *)blk_bh->b_data;
4068         struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
4069         int ret = 0;
4070         u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
4071         u64 p_blkno = 0;
4072
4073         if (!el->l_next_free_rec || !rec_func)
4074                 return 0;
4075
4076         while (name_hash > 0) {
4077                 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
4078                                           &e_cpos, &num_clusters, el);
4079                 if (ret) {
4080                         mlog_errno(ret);
4081                         break;
4082                 }
4083
4084                 ret = rec_func(inode, blk_bh, p_blkno, e_cpos,
4085                                num_clusters, para);
4086                 if (ret) {
4087                         if (ret != -ERANGE)
4088                                 mlog_errno(ret);
4089                         break;
4090                 }
4091
4092                 if (e_cpos == 0)
4093                         break;
4094
4095                 name_hash = e_cpos - 1;
4096         }
4097
4098         return ret;
4099
4100 }
4101
4102 static int ocfs2_list_xattr_tree_rec(struct inode *inode,
4103                                      struct buffer_head *root_bh,
4104                                      u64 blkno, u32 cpos, u32 len, void *para)
4105 {
4106         return ocfs2_iterate_xattr_buckets(inode, blkno, len,
4107                                            ocfs2_list_xattr_bucket, para);
4108 }
4109
4110 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
4111                                              struct buffer_head *blk_bh,
4112                                              char *buffer,
4113                                              size_t buffer_size)
4114 {
4115         int ret;
4116         struct ocfs2_xattr_tree_list xl = {
4117                 .buffer = buffer,
4118                 .buffer_size = buffer_size,
4119                 .result = 0,
4120         };
4121
4122         ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
4123                                               ocfs2_list_xattr_tree_rec, &xl);
4124         if (ret) {
4125                 mlog_errno(ret);
4126                 goto out;
4127         }
4128
4129         ret = xl.result;
4130 out:
4131         return ret;
4132 }
4133
4134 static int cmp_xe(const void *a, const void *b)
4135 {
4136         const struct ocfs2_xattr_entry *l = a, *r = b;
4137         u32 l_hash = le32_to_cpu(l->xe_name_hash);
4138         u32 r_hash = le32_to_cpu(r->xe_name_hash);
4139
4140         if (l_hash > r_hash)
4141                 return 1;
4142         if (l_hash < r_hash)
4143                 return -1;
4144         return 0;
4145 }
4146
4147 static void swap_xe(void *a, void *b, int size)
4148 {
4149         struct ocfs2_xattr_entry *l = a, *r = b, tmp;
4150
4151         tmp = *l;
4152         memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
4153         memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
4154 }
4155
4156 /*
4157  * When the ocfs2_xattr_block is filled up, new bucket will be created
4158  * and all the xattr entries will be moved to the new bucket.
4159  * The header goes at the start of the bucket, and the names+values are
4160  * filled from the end.  This is why *target starts as the last buffer.
4161  * Note: we need to sort the entries since they are not saved in order
4162  * in the ocfs2_xattr_block.
4163  */
4164 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
4165                                            struct buffer_head *xb_bh,
4166                                            struct ocfs2_xattr_bucket *bucket)
4167 {
4168         int i, blocksize = inode->i_sb->s_blocksize;
4169         int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4170         u16 offset, size, off_change;
4171         struct ocfs2_xattr_entry *xe;
4172         struct ocfs2_xattr_block *xb =
4173                                 (struct ocfs2_xattr_block *)xb_bh->b_data;
4174         struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
4175         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
4176         u16 count = le16_to_cpu(xb_xh->xh_count);
4177         char *src = xb_bh->b_data;
4178         char *target = bucket_block(bucket, blks - 1);
4179
4180         trace_ocfs2_cp_xattr_block_to_bucket_begin(
4181                                 (unsigned long long)xb_bh->b_blocknr,
4182                                 (unsigned long long)bucket_blkno(bucket));
4183
4184         for (i = 0; i < blks; i++)
4185                 memset(bucket_block(bucket, i), 0, blocksize);
4186
4187         /*
4188          * Since the xe_name_offset is based on ocfs2_xattr_header,
4189          * there is a offset change corresponding to the change of
4190          * ocfs2_xattr_header's position.
4191          */
4192         off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
4193         xe = &xb_xh->xh_entries[count - 1];
4194         offset = le16_to_cpu(xe->xe_name_offset) + off_change;
4195         size = blocksize - offset;
4196
4197         /* copy all the names and values. */
4198         memcpy(target + offset, src + offset, size);
4199
4200         /* Init new header now. */
4201         xh->xh_count = xb_xh->xh_count;
4202         xh->xh_num_buckets = cpu_to_le16(1);
4203         xh->xh_name_value_len = cpu_to_le16(size);
4204         xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
4205
4206         /* copy all the entries. */
4207         target = bucket_block(bucket, 0);
4208         offset = offsetof(struct ocfs2_xattr_header, xh_entries);
4209         size = count * sizeof(struct ocfs2_xattr_entry);
4210         memcpy(target + offset, (char *)xb_xh + offset, size);
4211
4212         /* Change the xe offset for all the xe because of the move. */
4213         off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
4214                  offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
4215         for (i = 0; i < count; i++)
4216                 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
4217
4218         trace_ocfs2_cp_xattr_block_to_bucket_end(offset, size, off_change);
4219
4220         sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
4221              cmp_xe, swap_xe);
4222 }
4223
4224 /*
4225  * After we move xattr from block to index btree, we have to
4226  * update ocfs2_xattr_search to the new xe and base.
4227  *
4228  * When the entry is in xattr block, xattr_bh indicates the storage place.
4229  * While if the entry is in index b-tree, "bucket" indicates the
4230  * real place of the xattr.
4231  */
4232 static void ocfs2_xattr_update_xattr_search(struct inode *inode,
4233                                             struct ocfs2_xattr_search *xs,
4234                                             struct buffer_head *old_bh)
4235 {
4236         char *buf = old_bh->b_data;
4237         struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
4238         struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
4239         int i;
4240
4241         xs->header = bucket_xh(xs->bucket);
4242         xs->base = bucket_block(xs->bucket, 0);
4243         xs->end = xs->base + inode->i_sb->s_blocksize;
4244
4245         if (xs->not_found)
4246                 return;
4247
4248         i = xs->here - old_xh->xh_entries;
4249         xs->here = &xs->header->xh_entries[i];
4250 }
4251
4252 static int ocfs2_xattr_create_index_block(struct inode *inode,
4253                                           struct ocfs2_xattr_search *xs,
4254                                           struct ocfs2_xattr_set_ctxt *ctxt)
4255 {
4256         int ret;
4257         u32 bit_off, len;
4258         u64 blkno;
4259         handle_t *handle = ctxt->handle;
4260         struct ocfs2_inode_info *oi = OCFS2_I(inode);
4261         struct buffer_head *xb_bh = xs->xattr_bh;
4262         struct ocfs2_xattr_block *xb =
4263                         (struct ocfs2_xattr_block *)xb_bh->b_data;
4264         struct ocfs2_xattr_tree_root *xr;
4265         u16 xb_flags = le16_to_cpu(xb->xb_flags);
4266
4267         trace_ocfs2_xattr_create_index_block_begin(
4268                                 (unsigned long long)xb_bh->b_blocknr);
4269
4270         BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
4271         BUG_ON(!xs->bucket);
4272
4273         /*
4274          * XXX:
4275          * We can use this lock for now, and maybe move to a dedicated mutex
4276          * if performance becomes a problem later.
4277          */
4278         down_write(&oi->ip_alloc_sem);
4279
4280         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), xb_bh,
4281                                       OCFS2_JOURNAL_ACCESS_WRITE);
4282         if (ret) {
4283                 mlog_errno(ret);
4284                 goto out;
4285         }
4286
4287         ret = __ocfs2_claim_clusters(handle, ctxt->data_ac,
4288                                      1, 1, &bit_off, &len);
4289         if (ret) {
4290                 mlog_errno(ret);
4291                 goto out;
4292         }
4293
4294         /*
4295          * The bucket may spread in many blocks, and
4296          * we will only touch the 1st block and the last block
4297          * in the whole bucket(one for entry and one for data).
4298          */
4299         blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
4300
4301         trace_ocfs2_xattr_create_index_block((unsigned long long)blkno);
4302
4303         ret = ocfs2_init_xattr_bucket(xs->bucket, blkno);
4304         if (ret) {
4305                 mlog_errno(ret);
4306                 goto out;
4307         }
4308
4309         ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
4310                                                 OCFS2_JOURNAL_ACCESS_CREATE);
4311         if (ret) {
4312                 mlog_errno(ret);
4313                 goto out;
4314         }
4315
4316         ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xs->bucket);
4317         ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
4318
4319         ocfs2_xattr_update_xattr_search(inode, xs, xb_bh);
4320
4321         /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
4322         memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
4323                offsetof(struct ocfs2_xattr_block, xb_attrs));
4324
4325         xr = &xb->xb_attrs.xb_root;
4326         xr->xt_clusters = cpu_to_le32(1);
4327         xr->xt_last_eb_blk = 0;
4328         xr->xt_list.l_tree_depth = 0;
4329         xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
4330         xr->xt_list.l_next_free_rec = cpu_to_le16(1);
4331
4332         xr->xt_list.l_recs[0].e_cpos = 0;
4333         xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
4334         xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
4335
4336         xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
4337
4338         ocfs2_journal_dirty(handle, xb_bh);
4339
4340 out:
4341         up_write(&oi->ip_alloc_sem);
4342
4343         return ret;
4344 }
4345
4346 static int cmp_xe_offset(const void *a, const void *b)
4347 {
4348         const struct ocfs2_xattr_entry *l = a, *r = b;
4349         u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
4350         u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
4351
4352         if (l_name_offset < r_name_offset)
4353                 return 1;
4354         if (l_name_offset > r_name_offset)
4355                 return -1;
4356         return 0;
4357 }
4358
4359 /*
4360  * defrag a xattr bucket if we find that the bucket has some
4361  * holes beteen name/value pairs.
4362  * We will move all the name/value pairs to the end of the bucket
4363  * so that we can spare some space for insertion.
4364  */
4365 static int ocfs2_defrag_xattr_bucket(struct inode *inode,
4366                                      handle_t *handle,
4367                                      struct ocfs2_xattr_bucket *bucket)
4368 {
4369         int ret, i;
4370         size_t end, offset, len;
4371         struct ocfs2_xattr_header *xh;
4372         char *entries, *buf, *bucket_buf = NULL;
4373         u64 blkno = bucket_blkno(bucket);
4374         u16 xh_free_start;
4375         size_t blocksize = inode->i_sb->s_blocksize;
4376         struct ocfs2_xattr_entry *xe;
4377
4378         /*
4379          * In order to make the operation more efficient and generic,
4380          * we copy all the blocks into a contiguous memory and do the
4381          * defragment there, so if anything is error, we will not touch
4382          * the real block.
4383          */
4384         bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
4385         if (!bucket_buf) {
4386                 ret = -EIO;
4387                 goto out;
4388         }
4389
4390         buf = bucket_buf;
4391         for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
4392                 memcpy(buf, bucket_block(bucket, i), blocksize);
4393
4394         ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
4395                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4396         if (ret < 0) {
4397                 mlog_errno(ret);
4398                 goto out;
4399         }
4400
4401         xh = (struct ocfs2_xattr_header *)bucket_buf;
4402         entries = (char *)xh->xh_entries;
4403         xh_free_start = le16_to_cpu(xh->xh_free_start);
4404
4405         trace_ocfs2_defrag_xattr_bucket(
4406              (unsigned long long)blkno, le16_to_cpu(xh->xh_count),
4407              xh_free_start, le16_to_cpu(xh->xh_name_value_len));
4408
4409         /*
4410          * sort all the entries by their offset.
4411          * the largest will be the first, so that we can
4412          * move them to the end one by one.
4413          */
4414         sort(entries, le16_to_cpu(xh->xh_count),
4415              sizeof(struct ocfs2_xattr_entry),
4416              cmp_xe_offset, swap_xe);
4417
4418         /* Move all name/values to the end of the bucket. */
4419         xe = xh->xh_entries;
4420         end = OCFS2_XATTR_BUCKET_SIZE;
4421         for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
4422                 offset = le16_to_cpu(xe->xe_name_offset);
4423                 len = namevalue_size_xe(xe);
4424
4425                 /*
4426                  * We must make sure that the name/value pair
4427                  * exist in the same block. So adjust end to
4428                  * the previous block end if needed.
4429                  */
4430                 if (((end - len) / blocksize !=
4431                         (end - 1) / blocksize))
4432                         end = end - end % blocksize;
4433
4434                 if (end > offset + len) {
4435                         memmove(bucket_buf + end - len,
4436                                 bucket_buf + offset, len);
4437                         xe->xe_name_offset = cpu_to_le16(end - len);
4438                 }
4439
4440                 mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
4441                                 "bucket %llu\n", (unsigned long long)blkno);
4442
4443                 end -= len;
4444         }
4445
4446         mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
4447                         "bucket %llu\n", (unsigned long long)blkno);
4448
4449         if (xh_free_start == end)
4450                 goto out;
4451
4452         memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
4453         xh->xh_free_start = cpu_to_le16(end);
4454
4455         /* sort the entries by their name_hash. */
4456         sort(entries, le16_to_cpu(xh->xh_count),
4457              sizeof(struct ocfs2_xattr_entry),
4458              cmp_xe, swap_xe);
4459
4460         buf = bucket_buf;
4461         for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
4462                 memcpy(bucket_block(bucket, i), buf, blocksize);
4463         ocfs2_xattr_bucket_journal_dirty(handle, bucket);
4464
4465 out:
4466         kfree(bucket_buf);
4467         return ret;
4468 }
4469
4470 /*
4471  * prev_blkno points to the start of an existing extent.  new_blkno
4472  * points to a newly allocated extent.  Because we know each of our
4473  * clusters contains more than bucket, we can easily split one cluster
4474  * at a bucket boundary.  So we take the last cluster of the existing
4475  * extent and split it down the middle.  We move the last half of the
4476  * buckets in the last cluster of the existing extent over to the new
4477  * extent.
4478  *
4479  * first_bh is the buffer at prev_blkno so we can update the existing
4480  * extent's bucket count.  header_bh is the bucket were we were hoping
4481  * to insert our xattr.  If the bucket move places the target in the new
4482  * extent, we'll update first_bh and header_bh after modifying the old
4483  * extent.
4484  *
4485  * first_hash will be set as the 1st xe's name_hash in the new extent.
4486  */
4487 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
4488                                                handle_t *handle,
4489                                                struct ocfs2_xattr_bucket *first,
4490                                                struct ocfs2_xattr_bucket *target,
4491                                                u64 new_blkno,
4492                                                u32 num_clusters,
4493                                                u32 *first_hash)
4494 {
4495         int ret;
4496         struct super_block *sb = inode->i_sb;
4497         int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(sb);
4498         int num_buckets = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(sb));
4499         int to_move = num_buckets / 2;
4500         u64 src_blkno;
4501         u64 last_cluster_blkno = bucket_blkno(first) +
4502                 ((num_clusters - 1) * ocfs2_clusters_to_blocks(sb, 1));
4503
4504         BUG_ON(le16_to_cpu(bucket_xh(first)->xh_num_buckets) < num_buckets);
4505         BUG_ON(OCFS2_XATTR_BUCKET_SIZE == OCFS2_SB(sb)->s_clustersize);
4506
4507         trace_ocfs2_mv_xattr_bucket_cross_cluster(
4508                                 (unsigned long long)last_cluster_blkno,
4509                                 (unsigned long long)new_blkno);
4510
4511         ret = ocfs2_mv_xattr_buckets(inode, handle, bucket_blkno(first),
4512                                      last_cluster_blkno, new_blkno,
4513                                      to_move, first_hash);
4514         if (ret) {
4515                 mlog_errno(ret);
4516                 goto out;
4517         }
4518
4519         /* This is the first bucket that got moved */
4520         src_blkno = last_cluster_blkno + (to_move * blks_per_bucket);
4521
4522         /*
4523          * If the target bucket was part of the moved buckets, we need to
4524          * update first and target.
4525          */
4526         if (bucket_blkno(target) >= src_blkno) {
4527                 /* Find the block for the new target bucket */
4528                 src_blkno = new_blkno +
4529                         (bucket_blkno(target) - src_blkno);
4530
4531                 ocfs2_xattr_bucket_relse(first);
4532                 ocfs2_xattr_bucket_relse(target);
4533
4534                 /*
4535                  * These shouldn't fail - the buffers are in the
4536                  * journal from ocfs2_cp_xattr_bucket().
4537                  */
4538                 ret = ocfs2_read_xattr_bucket(first, new_blkno);
4539                 if (ret) {
4540                         mlog_errno(ret);
4541                         goto out;
4542                 }
4543                 ret = ocfs2_read_xattr_bucket(target, src_blkno);
4544                 if (ret)
4545                         mlog_errno(ret);
4546
4547         }
4548
4549 out:
4550         return ret;
4551 }
4552
4553 /*
4554  * Find the suitable pos when we divide a bucket into 2.
4555  * We have to make sure the xattrs with the same hash value exist
4556  * in the same bucket.
4557  *
4558  * If this ocfs2_xattr_header covers more than one hash value, find a
4559  * place where the hash value changes.  Try to find the most even split.
4560  * The most common case is that all entries have different hash values,
4561  * and the first check we make will find a place to split.
4562  */
4563 static int ocfs2_xattr_find_divide_pos(struct ocfs2_xattr_header *xh)
4564 {
4565         struct ocfs2_xattr_entry *entries = xh->xh_entries;
4566         int count = le16_to_cpu(xh->xh_count);
4567         int delta, middle = count / 2;
4568
4569         /*
4570          * We start at the middle.  Each step gets farther away in both
4571          * directions.  We therefore hit the change in hash value
4572          * nearest to the middle.  Note that this loop does not execute for
4573          * count < 2.
4574          */
4575         for (delta = 0; delta < middle; delta++) {
4576                 /* Let's check delta earlier than middle */
4577                 if (cmp_xe(&entries[middle - delta - 1],
4578                            &entries[middle - delta]))
4579                         return middle - delta;
4580
4581                 /* For even counts, don't walk off the end */
4582                 if ((middle + delta + 1) == count)
4583                         continue;
4584
4585                 /* Now try delta past middle */
4586                 if (cmp_xe(&entries[middle + delta],
4587                            &entries[middle + delta + 1]))
4588                         return middle + delta + 1;
4589         }
4590
4591         /* Every entry had the same hash */
4592         return count;
4593 }
4594
4595 /*
4596  * Move some xattrs in old bucket(blk) to new bucket(new_blk).
4597  * first_hash will record the 1st hash of the new bucket.
4598  *
4599  * Normally half of the xattrs will be moved.  But we have to make
4600  * sure that the xattrs with the same hash value are stored in the
4601  * same bucket. If all the xattrs in this bucket have the same hash
4602  * value, the new bucket will be initialized as an empty one and the
4603  * first_hash will be initialized as (hash_value+1).
4604  */
4605 static int ocfs2_divide_xattr_bucket(struct inode *inode,
4606                                     handle_t *handle,
4607                                     u64 blk,
4608                                     u64 new_blk,
4609                                     u32 *first_hash,
4610                                     int new_bucket_head)
4611 {
4612         int ret, i;
4613         int count, start, len, name_value_len = 0, name_offset = 0;
4614         struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
4615         struct ocfs2_xattr_header *xh;
4616         struct ocfs2_xattr_entry *xe;
4617         int blocksize = inode->i_sb->s_blocksize;
4618
4619         trace_ocfs2_divide_xattr_bucket_begin((unsigned long long)blk,
4620                                               (unsigned long long)new_blk);
4621
4622         s_bucket = ocfs2_xattr_bucket_new(inode);
4623         t_bucket = ocfs2_xattr_bucket_new(inode);
4624         if (!s_bucket || !t_bucket) {
4625                 ret = -ENOMEM;
4626                 mlog_errno(ret);
4627                 goto out;
4628         }
4629
4630         ret = ocfs2_read_xattr_bucket(s_bucket, blk);
4631         if (ret) {
4632                 mlog_errno(ret);
4633                 goto out;
4634         }
4635
4636         ret = ocfs2_xattr_bucket_journal_access(handle, s_bucket,
4637                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4638         if (ret) {
4639                 mlog_errno(ret);
4640                 goto out;
4641         }
4642
4643         /*
4644          * Even if !new_bucket_head, we're overwriting t_bucket.  Thus,
4645          * there's no need to read it.
4646          */
4647         ret = ocfs2_init_xattr_bucket(t_bucket, new_blk);
4648         if (ret) {
4649                 mlog_errno(ret);
4650                 goto out;
4651         }
4652
4653         /*
4654          * Hey, if we're overwriting t_bucket, what difference does
4655          * ACCESS_CREATE vs ACCESS_WRITE make?  See the comment in the
4656          * same part of ocfs2_cp_xattr_bucket().
4657          */
4658         ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4659                                                 new_bucket_head ?
4660                                                 OCFS2_JOURNAL_ACCESS_CREATE :
4661                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4662         if (ret) {
4663                 mlog_errno(ret);
4664                 goto out;
4665         }
4666
4667         xh = bucket_xh(s_bucket);
4668         count = le16_to_cpu(xh->xh_count);
4669         start = ocfs2_xattr_find_divide_pos(xh);
4670
4671         if (start == count) {
4672                 xe = &xh->xh_entries[start-1];
4673
4674                 /*
4675                  * initialized a new empty bucket here.
4676                  * The hash value is set as one larger than
4677                  * that of the last entry in the previous bucket.
4678                  */
4679                 for (i = 0; i < t_bucket->bu_blocks; i++)
4680                         memset(bucket_block(t_bucket, i), 0, blocksize);
4681
4682                 xh = bucket_xh(t_bucket);
4683                 xh->xh_free_start = cpu_to_le16(blocksize);
4684                 xh->xh_entries[0].xe_name_hash = xe->xe_name_hash;
4685                 le32_add_cpu(&xh->xh_entries[0].xe_name_hash, 1);
4686
4687                 goto set_num_buckets;
4688         }
4689
4690         /* copy the whole bucket to the new first. */
4691         ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4692
4693         /* update the new bucket. */
4694         xh = bucket_xh(t_bucket);
4695
4696         /*
4697          * Calculate the total name/value len and xh_free_start for
4698          * the old bucket first.
4699          */
4700         name_offset = OCFS2_XATTR_BUCKET_SIZE;
4701         name_value_len = 0;
4702         for (i = 0; i < start; i++) {
4703                 xe = &xh->xh_entries[i];
4704                 name_value_len += namevalue_size_xe(xe);
4705                 if (le16_to_cpu(xe->xe_name_offset) < name_offset)
4706                         name_offset = le16_to_cpu(xe->xe_name_offset);
4707         }
4708
4709         /*
4710          * Now begin the modification to the new bucket.
4711          *
4712          * In the new bucket, We just move the xattr entry to the beginning
4713          * and don't touch the name/value. So there will be some holes in the
4714          * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
4715          * called.
4716          */
4717         xe = &xh->xh_entries[start];
4718         len = sizeof(struct ocfs2_xattr_entry) * (count - start);
4719         trace_ocfs2_divide_xattr_bucket_move(len,
4720                         (int)((char *)xe - (char *)xh),
4721                         (int)((char *)xh->xh_entries - (char *)xh));
4722         memmove((char *)xh->xh_entries, (char *)xe, len);
4723         xe = &xh->xh_entries[count - start];
4724         len = sizeof(struct ocfs2_xattr_entry) * start;
4725         memset((char *)xe, 0, len);
4726
4727         le16_add_cpu(&xh->xh_count, -start);
4728         le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
4729
4730         /* Calculate xh_free_start for the new bucket. */
4731         xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
4732         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
4733                 xe = &xh->xh_entries[i];
4734                 if (le16_to_cpu(xe->xe_name_offset) <
4735                     le16_to_cpu(xh->xh_free_start))
4736                         xh->xh_free_start = xe->xe_name_offset;
4737         }
4738
4739 set_num_buckets:
4740         /* set xh->xh_num_buckets for the new xh. */
4741         if (new_bucket_head)
4742                 xh->xh_num_buckets = cpu_to_le16(1);
4743         else
4744                 xh->xh_num_buckets = 0;
4745
4746         ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4747
4748         /* store the first_hash of the new bucket. */
4749         if (first_hash)
4750                 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
4751
4752         /*
4753          * Now only update the 1st block of the old bucket.  If we
4754          * just added a new empty bucket, there is no need to modify
4755          * it.
4756          */
4757         if (start == count)
4758                 goto out;
4759
4760         xh = bucket_xh(s_bucket);
4761         memset(&xh->xh_entries[start], 0,
4762                sizeof(struct ocfs2_xattr_entry) * (count - start));
4763         xh->xh_count = cpu_to_le16(start);
4764         xh->xh_free_start = cpu_to_le16(name_offset);
4765         xh->xh_name_value_len = cpu_to_le16(name_value_len);
4766
4767         ocfs2_xattr_bucket_journal_dirty(handle, s_bucket);
4768
4769 out:
4770         ocfs2_xattr_bucket_free(s_bucket);
4771         ocfs2_xattr_bucket_free(t_bucket);
4772
4773         return ret;
4774 }
4775
4776 /*
4777  * Copy xattr from one bucket to another bucket.
4778  *
4779  * The caller must make sure that the journal transaction
4780  * has enough space for journaling.
4781  */
4782 static int ocfs2_cp_xattr_bucket(struct inode *inode,
4783                                  handle_t *handle,
4784                                  u64 s_blkno,
4785                                  u64 t_blkno,
4786                                  int t_is_new)
4787 {
4788         int ret;
4789         struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
4790
4791         BUG_ON(s_blkno == t_blkno);
4792
4793         trace_ocfs2_cp_xattr_bucket((unsigned long long)s_blkno,
4794                                     (unsigned long long)t_blkno,
4795                                     t_is_new);
4796
4797         s_bucket = ocfs2_xattr_bucket_new(inode);
4798         t_bucket = ocfs2_xattr_bucket_new(inode);
4799         if (!s_bucket || !t_bucket) {
4800                 ret = -ENOMEM;
4801                 mlog_errno(ret);
4802                 goto out;
4803         }
4804
4805         ret = ocfs2_read_xattr_bucket(s_bucket, s_blkno);
4806         if (ret)
4807                 goto out;
4808
4809         /*
4810          * Even if !t_is_new, we're overwriting t_bucket.  Thus,
4811          * there's no need to read it.
4812          */
4813         ret = ocfs2_init_xattr_bucket(t_bucket, t_blkno);
4814         if (ret)
4815                 goto out;
4816
4817         /*
4818          * Hey, if we're overwriting t_bucket, what difference does
4819          * ACCESS_CREATE vs ACCESS_WRITE make?  Well, if we allocated a new
4820          * cluster to fill, we came here from
4821          * ocfs2_mv_xattr_buckets(), and it is really new -
4822          * ACCESS_CREATE is required.  But we also might have moved data
4823          * out of t_bucket before extending back into it.
4824          * ocfs2_add_new_xattr_bucket() can do this - its call to
4825          * ocfs2_add_new_xattr_cluster() may have created a new extent
4826          * and copied out the end of the old extent.  Then it re-extends
4827          * the old extent back to create space for new xattrs.  That's
4828          * how we get here, and the bucket isn't really new.
4829          */
4830         ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4831                                                 t_is_new ?
4832                                                 OCFS2_JOURNAL_ACCESS_CREATE :
4833                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4834         if (ret)
4835                 goto out;
4836
4837         ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4838         ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4839
4840 out:
4841         ocfs2_xattr_bucket_free(t_bucket);
4842         ocfs2_xattr_bucket_free(s_bucket);
4843
4844         return ret;
4845 }
4846
4847 /*
4848  * src_blk points to the start of an existing extent.  last_blk points to
4849  * last cluster in that extent.  to_blk points to a newly allocated
4850  * extent.  We copy the buckets from the cluster at last_blk to the new
4851  * extent.  If start_bucket is non-zero, we skip that many buckets before
4852  * we start copying.  The new extent's xh_num_buckets gets set to the
4853  * number of buckets we copied.  The old extent's xh_num_buckets shrinks
4854  * by the same amount.
4855  */
4856 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
4857                                   u64 src_blk, u64 last_blk, u64 to_blk,
4858                                   unsigned int start_bucket,
4859                                   u32 *first_hash)
4860 {
4861         int i, ret, credits;
4862         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4863         int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4864         int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
4865         struct ocfs2_xattr_bucket *old_first, *new_first;
4866
4867         trace_ocfs2_mv_xattr_buckets((unsigned long long)last_blk,
4868                                      (unsigned long long)to_blk);
4869
4870         BUG_ON(start_bucket >= num_buckets);
4871         if (start_bucket) {
4872                 num_buckets -= start_bucket;
4873                 last_blk += (start_bucket * blks_per_bucket);
4874         }
4875
4876         /* The first bucket of the original extent */
4877         old_first = ocfs2_xattr_bucket_new(inode);
4878         /* The first bucket of the new extent */
4879         new_first = ocfs2_xattr_bucket_new(inode);
4880         if (!old_first || !new_first) {
4881                 ret = -ENOMEM;
4882                 mlog_errno(ret);
4883                 goto out;
4884         }
4885
4886         ret = ocfs2_read_xattr_bucket(old_first, src_blk);
4887         if (ret) {
4888                 mlog_errno(ret);
4889                 goto out;
4890         }
4891
4892         /*
4893          * We need to update the first bucket of the old extent and all
4894          * the buckets going to the new extent.
4895          */
4896         credits = ((num_buckets + 1) * blks_per_bucket);
4897         ret = ocfs2_extend_trans(handle, credits);
4898         if (ret) {
4899                 mlog_errno(ret);
4900                 goto out;
4901         }
4902
4903         ret = ocfs2_xattr_bucket_journal_access(handle, old_first,
4904                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4905         if (ret) {
4906                 mlog_errno(ret);
4907                 goto out;
4908         }
4909
4910         for (i = 0; i < num_buckets; i++) {
4911                 ret = ocfs2_cp_xattr_bucket(inode, handle,
4912                                             last_blk + (i * blks_per_bucket),
4913                                             to_blk + (i * blks_per_bucket),
4914                                             1);
4915                 if (ret) {
4916                         mlog_errno(ret);
4917                         goto out;
4918                 }
4919         }
4920
4921         /*
4922          * Get the new bucket ready before we dirty anything
4923          * (This actually shouldn't fail, because we already dirtied
4924          * it once in ocfs2_cp_xattr_bucket()).
4925          */
4926         ret = ocfs2_read_xattr_bucket(new_first, to_blk);
4927         if (ret) {
4928                 mlog_errno(ret);
4929                 goto out;
4930         }
4931         ret = ocfs2_xattr_bucket_journal_access(handle, new_first,
4932                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4933         if (ret) {
4934                 mlog_errno(ret);
4935                 goto out;
4936         }
4937
4938         /* Now update the headers */
4939         le16_add_cpu(&bucket_xh(old_first)->xh_num_buckets, -num_buckets);
4940         ocfs2_xattr_bucket_journal_dirty(handle, old_first);
4941
4942         bucket_xh(new_first)->xh_num_buckets = cpu_to_le16(num_buckets);
4943         ocfs2_xattr_bucket_journal_dirty(handle, new_first);
4944
4945         if (first_hash)
4946                 *first_hash = le32_to_cpu(bucket_xh(new_first)->xh_entries[0].xe_name_hash);
4947
4948 out:
4949         ocfs2_xattr_bucket_free(new_first);
4950         ocfs2_xattr_bucket_free(old_first);
4951         return ret;
4952 }
4953
4954 /*
4955  * Move some xattrs in this cluster to the new cluster.
4956  * This function should only be called when bucket size == cluster size.
4957  * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
4958  */
4959 static int ocfs2_divide_xattr_cluster(struct inode *inode,
4960                                       handle_t *handle,
4961                                       u64 prev_blk,
4962                                       u64 new_blk,
4963                                       u32 *first_hash)
4964 {
4965         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4966         int ret, credits = 2 * blk_per_bucket;
4967
4968         BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
4969
4970         ret = ocfs2_extend_trans(handle, credits);
4971         if (ret) {
4972                 mlog_errno(ret);
4973                 return ret;
4974         }
4975
4976         /* Move half of the xattr in start_blk to the next bucket. */
4977         return  ocfs2_divide_xattr_bucket(inode, handle, prev_blk,
4978                                           new_blk, first_hash, 1);
4979 }
4980
4981 /*
4982  * Move some xattrs from the old cluster to the new one since they are not
4983  * contiguous in ocfs2 xattr tree.
4984  *
4985  * new_blk starts a new separate cluster, and we will move some xattrs from
4986  * prev_blk to it. v_start will be set as the first name hash value in this
4987  * new cluster so that it can be used as e_cpos during tree insertion and
4988  * don't collide with our original b-tree operations. first_bh and header_bh
4989  * will also be updated since they will be used in ocfs2_extend_xattr_bucket
4990  * to extend the insert bucket.
4991  *
4992  * The problem is how much xattr should we move to the new one and when should
4993  * we update first_bh and header_bh?
4994  * 1. If cluster size > bucket size, that means the previous cluster has more
4995  *    than 1 bucket, so just move half nums of bucket into the new cluster and
4996  *    update the first_bh and header_bh if the insert bucket has been moved
4997  *    to the new cluster.
4998  * 2. If cluster_size == bucket_size:
4999  *    a) If the previous extent rec has more than one cluster and the insert
5000  *       place isn't in the last cluster, copy the entire last cluster to the
5001  *       new one. This time, we don't need to upate the first_bh and header_bh
5002  *       since they will not be moved into the new cluster.
5003  *    b) Otherwise, move the bottom half of the xattrs in the last cluster into
5004  *       the new one. And we set the extend flag to zero if the insert place is
5005  *       moved into the new allocated cluster since no extend is needed.
5006  */
5007 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
5008                                             handle_t *handle,
5009                                             struct ocfs2_xattr_bucket *first,
5010                                             struct ocfs2_xattr_bucket *target,
5011                                             u64 new_blk,
5012                                             u32 prev_clusters,
5013                                             u32 *v_start,
5014                                             int *extend)
5015 {
5016         int ret;
5017
5018         trace_ocfs2_adjust_xattr_cross_cluster(
5019                         (unsigned long long)bucket_blkno(first),
5020                         (unsigned long long)new_blk, prev_clusters);
5021
5022         if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1) {
5023                 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
5024                                                           handle,
5025                                                           first, target,
5026                                                           new_blk,
5027                                                           prev_clusters,
5028                                                           v_start);
5029                 if (ret)
5030                         mlog_errno(ret);
5031         } else {
5032                 /* The start of the last cluster in the first extent */
5033                 u64 last_blk = bucket_blkno(first) +
5034                         ((prev_clusters - 1) *
5035                          ocfs2_clusters_to_blocks(inode->i_sb, 1));
5036
5037                 if (prev_clusters > 1 && bucket_blkno(target) != last_blk) {
5038                         ret = ocfs2_mv_xattr_buckets(inode, handle,
5039                                                      bucket_blkno(first),
5040                                                      last_blk, new_blk, 0,
5041                                                      v_start);
5042                         if (ret)
5043                                 mlog_errno(ret);
5044                 } else {
5045                         ret = ocfs2_divide_xattr_cluster(inode, handle,
5046                                                          last_blk, new_blk,
5047                                                          v_start);
5048                         if (ret)
5049                                 mlog_errno(ret);
5050
5051                         if ((bucket_blkno(target) == last_blk) && extend)
5052                                 *extend = 0;
5053                 }
5054         }
5055
5056         return ret;
5057 }
5058
5059 /*
5060  * Add a new cluster for xattr storage.
5061  *
5062  * If the new cluster is contiguous with the previous one, it will be
5063  * appended to the same extent record, and num_clusters will be updated.
5064  * If not, we will insert a new extent for it and move some xattrs in
5065  * the last cluster into the new allocated one.
5066  * We also need to limit the maximum size of a btree leaf, otherwise we'll
5067  * lose the benefits of hashing because we'll have to search large leaves.
5068  * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
5069  * if it's bigger).
5070  *
5071  * first_bh is the first block of the previous extent rec and header_bh
5072  * indicates the bucket we will insert the new xattrs. They will be updated
5073  * when the header_bh is moved into the new cluster.
5074  */
5075 static int ocfs2_add_new_xattr_cluster(struct inode *inode,
5076                                        struct buffer_head *root_bh,
5077                                        struct ocfs2_xattr_bucket *first,
5078                                        struct ocfs2_xattr_bucket *target,
5079                                        u32 *num_clusters,
5080                                        u32 prev_cpos,
5081                                        int *extend,
5082                                        struct ocfs2_xattr_set_ctxt *ctxt)
5083 {
5084         int ret;
5085         u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
5086         u32 prev_clusters = *num_clusters;
5087         u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
5088         u64 block;
5089         handle_t *handle = ctxt->handle;
5090         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5091         struct ocfs2_extent_tree et;
5092
5093         trace_ocfs2_add_new_xattr_cluster_begin(
5094                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
5095                 (unsigned long long)bucket_blkno(first),
5096                 prev_cpos, prev_clusters);
5097
5098         ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
5099
5100         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
5101                                       OCFS2_JOURNAL_ACCESS_WRITE);
5102         if (ret < 0) {
5103                 mlog_errno(ret);
5104                 goto leave;
5105         }
5106
5107         ret = __ocfs2_claim_clusters(handle, ctxt->data_ac, 1,
5108                                      clusters_to_add, &bit_off, &num_bits);
5109         if (ret < 0) {
5110                 if (ret != -ENOSPC)
5111                         mlog_errno(ret);
5112                 goto leave;
5113         }
5114
5115         BUG_ON(num_bits > clusters_to_add);
5116
5117         block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
5118         trace_ocfs2_add_new_xattr_cluster((unsigned long long)block, num_bits);
5119
5120         if (bucket_blkno(first) + (prev_clusters * bpc) == block &&
5121             (prev_clusters + num_bits) << osb->s_clustersize_bits <=
5122              OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
5123                 /*
5124                  * If this cluster is contiguous with the old one and
5125                  * adding this new cluster, we don't surpass the limit of
5126                  * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
5127                  * initialized and used like other buckets in the previous
5128                  * cluster.
5129                  * So add it as a contiguous one. The caller will handle
5130                  * its init process.
5131                  */
5132                 v_start = prev_cpos + prev_clusters;
5133                 *num_clusters = prev_clusters + num_bits;
5134         } else {
5135                 ret = ocfs2_adjust_xattr_cross_cluster(inode,
5136                                                        handle,
5137                                                        first,
5138                                                        target,
5139                                                        block,
5140                                                        prev_clusters,
5141                                                        &v_start,
5142                                                        extend);
5143                 if (ret) {
5144                         mlog_errno(ret);
5145                         goto leave;
5146                 }
5147         }
5148
5149         trace_ocfs2_add_new_xattr_cluster_insert((unsigned long long)block,
5150                                                  v_start, num_bits);
5151         ret = ocfs2_insert_extent(handle, &et, v_start, block,
5152                                   num_bits, 0, ctxt->meta_ac);
5153         if (ret < 0) {
5154                 mlog_errno(ret);
5155                 goto leave;
5156         }
5157
5158         ocfs2_journal_dirty(handle, root_bh);
5159
5160 leave:
5161         return ret;
5162 }
5163
5164 /*
5165  * We are given an extent.  'first' is the bucket at the very front of
5166  * the extent.  The extent has space for an additional bucket past
5167  * bucket_xh(first)->xh_num_buckets.  'target_blkno' is the block number
5168  * of the target bucket.  We wish to shift every bucket past the target
5169  * down one, filling in that additional space.  When we get back to the
5170  * target, we split the target between itself and the now-empty bucket
5171  * at target+1 (aka, target_blkno + blks_per_bucket).
5172  */
5173 static int ocfs2_extend_xattr_bucket(struct inode *inode,
5174                                      handle_t *handle,
5175                                      struct ocfs2_xattr_bucket *first,
5176                                      u64 target_blk,
5177                                      u32 num_clusters)
5178 {
5179         int ret, credits;
5180         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5181         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5182         u64 end_blk;
5183         u16 new_bucket = le16_to_cpu(bucket_xh(first)->xh_num_buckets);
5184
5185         trace_ocfs2_extend_xattr_bucket((unsigned long long)target_blk,
5186                                         (unsigned long long)bucket_blkno(first),
5187                                         num_clusters, new_bucket);
5188
5189         /* The extent must have room for an additional bucket */
5190         BUG_ON(new_bucket >=
5191                (num_clusters * ocfs2_xattr_buckets_per_cluster(osb)));
5192
5193         /* end_blk points to the last existing bucket */
5194         end_blk = bucket_blkno(first) + ((new_bucket - 1) * blk_per_bucket);
5195
5196         /*
5197          * end_blk is the start of the last existing bucket.
5198          * Thus, (end_blk - target_blk) covers the target bucket and
5199          * every bucket after it up to, but not including, the last
5200          * existing bucket.  Then we add the last existing bucket, the
5201          * new bucket, and the first bucket (3 * blk_per_bucket).
5202          */
5203         credits = (end_blk - target_blk) + (3 * blk_per_bucket);
5204         ret = ocfs2_extend_trans(handle, credits);
5205         if (ret) {
5206                 mlog_errno(ret);
5207                 goto out;
5208         }
5209
5210         ret = ocfs2_xattr_bucket_journal_access(handle, first,
5211                                                 OCFS2_JOURNAL_ACCESS_WRITE);
5212         if (ret) {
5213                 mlog_errno(ret);
5214                 goto out;
5215         }
5216
5217         while (end_blk != target_blk) {
5218                 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
5219                                             end_blk + blk_per_bucket, 0);
5220                 if (ret)
5221                         goto out;
5222                 end_blk -= blk_per_bucket;
5223         }
5224
5225         /* Move half of the xattr in target_blkno to the next bucket. */
5226         ret = ocfs2_divide_xattr_bucket(inode, handle, target_blk,
5227                                         target_blk + blk_per_bucket, NULL, 0);
5228
5229         le16_add_cpu(&bucket_xh(first)->xh_num_buckets, 1);
5230         ocfs2_xattr_bucket_journal_dirty(handle, first);
5231
5232 out:
5233         return ret;
5234 }
5235
5236 /*
5237  * Add new xattr bucket in an extent record and adjust the buckets
5238  * accordingly.  xb_bh is the ocfs2_xattr_block, and target is the
5239  * bucket we want to insert into.
5240  *
5241  * In the easy case, we will move all the buckets after target down by
5242  * one. Half of target's xattrs will be moved to the next bucket.
5243  *
5244  * If current cluster is full, we'll allocate a new one.  This may not
5245  * be contiguous.  The underlying calls will make sure that there is
5246  * space for the insert, shifting buckets around if necessary.
5247  * 'target' may be moved by those calls.
5248  */
5249 static int ocfs2_add_new_xattr_bucket(struct inode *inode,
5250                                       struct buffer_head *xb_bh,
5251                                       struct ocfs2_xattr_bucket *target,
5252                                       struct ocfs2_xattr_set_ctxt *ctxt)
5253 {
5254         struct ocfs2_xattr_block *xb =
5255                         (struct ocfs2_xattr_block *)xb_bh->b_data;
5256         struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
5257         struct ocfs2_extent_list *el = &xb_root->xt_list;
5258         u32 name_hash =
5259                 le32_to_cpu(bucket_xh(target)->xh_entries[0].xe_name_hash);
5260         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5261         int ret, num_buckets, extend = 1;
5262         u64 p_blkno;
5263         u32 e_cpos, num_clusters;
5264         /* The bucket at the front of the extent */
5265         struct ocfs2_xattr_bucket *first;
5266
5267         trace_ocfs2_add_new_xattr_bucket(
5268                                 (unsigned long long)bucket_blkno(target));
5269
5270         /* The first bucket of the original extent */
5271         first = ocfs2_xattr_bucket_new(inode);
5272         if (!first) {
5273                 ret = -ENOMEM;
5274                 mlog_errno(ret);
5275                 goto out;
5276         }
5277
5278         ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
5279                                   &num_clusters, el);
5280         if (ret) {
5281                 mlog_errno(ret);
5282                 goto out;
5283         }
5284
5285         ret = ocfs2_read_xattr_bucket(first, p_blkno);
5286         if (ret) {
5287                 mlog_errno(ret);
5288                 goto out;
5289         }
5290
5291         num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
5292         if (num_buckets == le16_to_cpu(bucket_xh(first)->xh_num_buckets)) {
5293                 /*
5294                  * This can move first+target if the target bucket moves
5295                  * to the new extent.
5296                  */
5297                 ret = ocfs2_add_new_xattr_cluster(inode,
5298                                                   xb_bh,
5299                                                   first,
5300                                                   target,
5301                                                   &num_clusters,
5302                                                   e_cpos,
5303                                                   &extend,
5304                                                   ctxt);
5305                 if (ret) {
5306                         mlog_errno(ret);
5307                         goto out;
5308                 }
5309         }
5310
5311         if (extend) {
5312                 ret = ocfs2_extend_xattr_bucket(inode,
5313                                                 ctxt->handle,
5314                                                 first,
5315                                                 bucket_blkno(target),
5316                                                 num_clusters);
5317                 if (ret)
5318                         mlog_errno(ret);
5319         }
5320
5321 out:
5322         ocfs2_xattr_bucket_free(first);
5323
5324         return ret;
5325 }
5326
5327 static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode,
5328                                         struct ocfs2_xattr_bucket *bucket,
5329                                         int offs)
5330 {
5331         int block_off = offs >> inode->i_sb->s_blocksize_bits;
5332
5333         offs = offs % inode->i_sb->s_blocksize;
5334         return bucket_block(bucket, block_off) + offs;
5335 }
5336
5337 /*
5338  * Truncate the specified xe_off entry in xattr bucket.
5339  * bucket is indicated by header_bh and len is the new length.
5340  * Both the ocfs2_xattr_value_root and the entry will be updated here.
5341  *
5342  * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
5343  */
5344 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
5345                                              struct ocfs2_xattr_bucket *bucket,
5346                                              int xe_off,
5347                                              int len,
5348                                              struct ocfs2_xattr_set_ctxt *ctxt)
5349 {
5350         int ret, offset;
5351         u64 value_blk;
5352         struct ocfs2_xattr_entry *xe;
5353         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5354         size_t blocksize = inode->i_sb->s_blocksize;
5355         struct ocfs2_xattr_value_buf vb = {
5356                 .vb_access = ocfs2_journal_access,
5357         };
5358
5359         xe = &xh->xh_entries[xe_off];
5360
5361         BUG_ON(!xe || ocfs2_xattr_is_local(xe));
5362
5363         offset = le16_to_cpu(xe->xe_name_offset) +
5364                  OCFS2_XATTR_SIZE(xe->xe_name_len);
5365
5366         value_blk = offset / blocksize;
5367
5368         /* We don't allow ocfs2_xattr_value to be stored in different block. */
5369         BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
5370
5371         vb.vb_bh = bucket->bu_bhs[value_blk];
5372         BUG_ON(!vb.vb_bh);
5373
5374         vb.vb_xv = (struct ocfs2_xattr_value_root *)
5375                 (vb.vb_bh->b_data + offset % blocksize);
5376
5377         /*
5378          * From here on out we have to dirty the bucket.  The generic
5379          * value calls only modify one of the bucket's bhs, but we need
5380          * to send the bucket at once.  So if they error, they *could* have
5381          * modified something.  We have to assume they did, and dirty
5382          * the whole bucket.  This leaves us in a consistent state.
5383          */
5384         trace_ocfs2_xattr_bucket_value_truncate(
5385                         (unsigned long long)bucket_blkno(bucket), xe_off, len);
5386         ret = ocfs2_xattr_value_truncate(inode, &vb, len, ctxt);
5387         if (ret) {
5388                 mlog_errno(ret);
5389                 goto out;
5390         }
5391
5392         ret = ocfs2_xattr_bucket_journal_access(ctxt->handle, bucket,
5393                                                 OCFS2_JOURNAL_ACCESS_WRITE);
5394         if (ret) {
5395                 mlog_errno(ret);
5396                 goto out;
5397         }
5398
5399         xe->xe_value_size = cpu_to_le64(len);
5400
5401         ocfs2_xattr_bucket_journal_dirty(ctxt->handle, bucket);
5402
5403 out:
5404         return ret;
5405 }
5406
5407 static int ocfs2_rm_xattr_cluster(struct inode *inode,
5408                                   struct buffer_head *root_bh,
5409                                   u64 blkno,
5410                                   u32 cpos,
5411                                   u32 len,
5412                                   void *para)
5413 {
5414         int ret;
5415         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5416         struct inode *tl_inode = osb->osb_tl_inode;
5417         handle_t *handle;
5418         struct ocfs2_xattr_block *xb =
5419                         (struct ocfs2_xattr_block *)root_bh->b_data;
5420         struct ocfs2_alloc_context *meta_ac = NULL;
5421         struct ocfs2_cached_dealloc_ctxt dealloc;
5422         struct ocfs2_extent_tree et;
5423
5424         ret = ocfs2_iterate_xattr_buckets(inode, blkno, len,
5425                                           ocfs2_delete_xattr_in_bucket, para);
5426         if (ret) {
5427                 mlog_errno(ret);
5428                 return ret;
5429         }
5430
5431         ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
5432
5433         ocfs2_init_dealloc_ctxt(&dealloc);
5434
5435         trace_ocfs2_rm_xattr_cluster(
5436                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
5437                         (unsigned long long)blkno, cpos, len);
5438
5439         ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode), blkno,
5440                                                len);
5441
5442         ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
5443         if (ret) {
5444                 mlog_errno(ret);
5445                 return ret;
5446         }
5447
5448         mutex_lock(&tl_inode->i_mutex);
5449
5450         if (ocfs2_truncate_log_needs_flush(osb)) {
5451                 ret = __ocfs2_flush_truncate_log(osb);
5452                 if (ret < 0) {
5453                         mlog_errno(ret);
5454                         goto out;
5455                 }
5456         }
5457
5458         handle = ocfs2_start_trans(osb, ocfs2_remove_extent_credits(osb->sb));
5459         if (IS_ERR(handle)) {
5460                 ret = -ENOMEM;
5461                 mlog_errno(ret);
5462                 goto out;
5463         }
5464
5465         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
5466                                       OCFS2_JOURNAL_ACCESS_WRITE);
5467         if (ret) {
5468                 mlog_errno(ret);
5469                 goto out_commit;
5470         }
5471
5472         ret = ocfs2_remove_extent(handle, &et, cpos, len, meta_ac,
5473                                   &dealloc);
5474         if (ret) {
5475                 mlog_errno(ret);
5476                 goto out_commit;
5477         }
5478
5479         le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
5480         ocfs2_journal_dirty(handle, root_bh);
5481
5482         ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
5483         if (ret)
5484                 mlog_errno(ret);
5485
5486 out_commit:
5487         ocfs2_commit_trans(osb, handle);
5488 out:
5489         ocfs2_schedule_truncate_log_flush(osb, 1);
5490
5491         mutex_unlock(&tl_inode->i_mutex);
5492
5493         if (meta_ac)
5494                 ocfs2_free_alloc_context(meta_ac);
5495
5496         ocfs2_run_deallocs(osb, &dealloc);
5497
5498         return ret;
5499 }
5500
5501 /*
5502  * check whether the xattr bucket is filled up with the same hash value.
5503  * If we want to insert the xattr with the same hash, return -ENOSPC.
5504  * If we want to insert a xattr with different hash value, go ahead
5505  * and ocfs2_divide_xattr_bucket will handle this.
5506  */
5507 static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
5508                                               struct ocfs2_xattr_bucket *bucket,
5509                                               const char *name)
5510 {
5511         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5512         u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
5513
5514         if (name_hash != le32_to_cpu(xh->xh_entries[0].xe_name_hash))
5515                 return 0;
5516
5517         if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
5518             xh->xh_entries[0].xe_name_hash) {
5519                 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
5520                      "hash = %u\n",
5521                      (unsigned long long)bucket_blkno(bucket),
5522                      le32_to_cpu(xh->xh_entries[0].xe_name_hash));
5523                 return -ENOSPC;
5524         }
5525
5526         return 0;
5527 }
5528
5529 /*
5530  * Try to set the entry in the current bucket.  If we fail, the caller
5531  * will handle getting us another bucket.
5532  */
5533 static int ocfs2_xattr_set_entry_bucket(struct inode *inode,
5534                                         struct ocfs2_xattr_info *xi,
5535                                         struct ocfs2_xattr_search *xs,
5536                                         struct ocfs2_xattr_set_ctxt *ctxt)
5537 {
5538         int ret;
5539         struct ocfs2_xa_loc loc;
5540
5541         trace_ocfs2_xattr_set_entry_bucket(xi->xi_name);
5542
5543         ocfs2_init_xattr_bucket_xa_loc(&loc, xs->bucket,
5544                                        xs->not_found ? NULL : xs->here);
5545         ret = ocfs2_xa_set(&loc, xi, ctxt);
5546         if (!ret) {
5547                 xs->here = loc.xl_entry;
5548                 goto out;
5549         }
5550         if (ret != -ENOSPC) {
5551                 mlog_errno(ret);
5552                 goto out;
5553         }
5554
5555         /* Ok, we need space.  Let's try defragmenting the bucket. */
5556         ret = ocfs2_defrag_xattr_bucket(inode, ctxt->handle,
5557                                         xs->bucket);
5558         if (ret) {
5559                 mlog_errno(ret);
5560                 goto out;
5561         }
5562
5563         ret = ocfs2_xa_set(&loc, xi, ctxt);
5564         if (!ret) {
5565                 xs->here = loc.xl_entry;
5566                 goto out;
5567         }
5568         if (ret != -ENOSPC)
5569                 mlog_errno(ret);
5570
5571
5572 out:
5573         return ret;
5574 }
5575
5576 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
5577                                              struct ocfs2_xattr_info *xi,
5578                                              struct ocfs2_xattr_search *xs,
5579                                              struct ocfs2_xattr_set_ctxt *ctxt)
5580 {
5581         int ret;
5582
5583         trace_ocfs2_xattr_set_entry_index_block(xi->xi_name);
5584
5585         ret = ocfs2_xattr_set_entry_bucket(inode, xi, xs, ctxt);
5586         if (!ret)
5587                 goto out;
5588         if (ret != -ENOSPC) {
5589                 mlog_errno(ret);
5590                 goto out;
5591         }
5592
5593         /* Ack, need more space.  Let's try to get another bucket! */
5594
5595         /*
5596          * We do not allow for