ocfs2: Attach xattr clusters to refcount tree.
[linux-2.6.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 #define MLOG_MASK_PREFIX ML_XATTR
41 #include <cluster/masklog.h>
42
43 #include "ocfs2.h"
44 #include "alloc.h"
45 #include "blockcheck.h"
46 #include "dlmglue.h"
47 #include "file.h"
48 #include "symlink.h"
49 #include "sysfile.h"
50 #include "inode.h"
51 #include "journal.h"
52 #include "ocfs2_fs.h"
53 #include "suballoc.h"
54 #include "uptodate.h"
55 #include "buffer_head_io.h"
56 #include "super.h"
57 #include "xattr.h"
58 #include "refcounttree.h"
59
60 struct ocfs2_xattr_def_value_root {
61         struct ocfs2_xattr_value_root   xv;
62         struct ocfs2_extent_rec         er;
63 };
64
65 struct ocfs2_xattr_bucket {
66         /* The inode these xattrs are associated with */
67         struct inode *bu_inode;
68
69         /* The actual buffers that make up the bucket */
70         struct buffer_head *bu_bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET];
71
72         /* How many blocks make up one bucket for this filesystem */
73         int bu_blocks;
74 };
75
76 struct ocfs2_xattr_set_ctxt {
77         handle_t *handle;
78         struct ocfs2_alloc_context *meta_ac;
79         struct ocfs2_alloc_context *data_ac;
80         struct ocfs2_cached_dealloc_ctxt dealloc;
81 };
82
83 #define OCFS2_XATTR_ROOT_SIZE   (sizeof(struct ocfs2_xattr_def_value_root))
84 #define OCFS2_XATTR_INLINE_SIZE 80
85 #define OCFS2_XATTR_HEADER_GAP  4
86 #define OCFS2_XATTR_FREE_IN_IBODY       (OCFS2_MIN_XATTR_INLINE_SIZE \
87                                          - sizeof(struct ocfs2_xattr_header) \
88                                          - OCFS2_XATTR_HEADER_GAP)
89 #define OCFS2_XATTR_FREE_IN_BLOCK(ptr)  ((ptr)->i_sb->s_blocksize \
90                                          - sizeof(struct ocfs2_xattr_block) \
91                                          - sizeof(struct ocfs2_xattr_header) \
92                                          - OCFS2_XATTR_HEADER_GAP)
93
94 static struct ocfs2_xattr_def_value_root def_xv = {
95         .xv.xr_list.l_count = cpu_to_le16(1),
96 };
97
98 struct xattr_handler *ocfs2_xattr_handlers[] = {
99         &ocfs2_xattr_user_handler,
100 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
101         &ocfs2_xattr_acl_access_handler,
102         &ocfs2_xattr_acl_default_handler,
103 #endif
104         &ocfs2_xattr_trusted_handler,
105         &ocfs2_xattr_security_handler,
106         NULL
107 };
108
109 static struct xattr_handler *ocfs2_xattr_handler_map[OCFS2_XATTR_MAX] = {
110         [OCFS2_XATTR_INDEX_USER]        = &ocfs2_xattr_user_handler,
111 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
112         [OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS]
113                                         = &ocfs2_xattr_acl_access_handler,
114         [OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT]
115                                         = &ocfs2_xattr_acl_default_handler,
116 #endif
117         [OCFS2_XATTR_INDEX_TRUSTED]     = &ocfs2_xattr_trusted_handler,
118         [OCFS2_XATTR_INDEX_SECURITY]    = &ocfs2_xattr_security_handler,
119 };
120
121 struct ocfs2_xattr_info {
122         int name_index;
123         const char *name;
124         const void *value;
125         size_t value_len;
126 };
127
128 struct ocfs2_xattr_search {
129         struct buffer_head *inode_bh;
130         /*
131          * xattr_bh point to the block buffer head which has extended attribute
132          * when extended attribute in inode, xattr_bh is equal to inode_bh.
133          */
134         struct buffer_head *xattr_bh;
135         struct ocfs2_xattr_header *header;
136         struct ocfs2_xattr_bucket *bucket;
137         void *base;
138         void *end;
139         struct ocfs2_xattr_entry *here;
140         int not_found;
141 };
142
143 static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
144                                              struct ocfs2_xattr_header *xh,
145                                              int index,
146                                              int *block_off,
147                                              int *new_offset);
148
149 static int ocfs2_xattr_block_find(struct inode *inode,
150                                   int name_index,
151                                   const char *name,
152                                   struct ocfs2_xattr_search *xs);
153 static int ocfs2_xattr_index_block_find(struct inode *inode,
154                                         struct buffer_head *root_bh,
155                                         int name_index,
156                                         const char *name,
157                                         struct ocfs2_xattr_search *xs);
158
159 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
160                                         struct buffer_head *blk_bh,
161                                         char *buffer,
162                                         size_t buffer_size);
163
164 static int ocfs2_xattr_create_index_block(struct inode *inode,
165                                           struct ocfs2_xattr_search *xs,
166                                           struct ocfs2_xattr_set_ctxt *ctxt);
167
168 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
169                                              struct ocfs2_xattr_info *xi,
170                                              struct ocfs2_xattr_search *xs,
171                                              struct ocfs2_xattr_set_ctxt *ctxt);
172
173 typedef int (xattr_tree_rec_func)(struct inode *inode,
174                                   struct buffer_head *root_bh,
175                                   u64 blkno, u32 cpos, u32 len, void *para);
176 static int ocfs2_iterate_xattr_index_block(struct inode *inode,
177                                            struct buffer_head *root_bh,
178                                            xattr_tree_rec_func *rec_func,
179                                            void *para);
180 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
181                                         struct ocfs2_xattr_bucket *bucket,
182                                         void *para);
183 static int ocfs2_rm_xattr_cluster(struct inode *inode,
184                                   struct buffer_head *root_bh,
185                                   u64 blkno,
186                                   u32 cpos,
187                                   u32 len,
188                                   void *para);
189
190 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
191                                   u64 src_blk, u64 last_blk, u64 to_blk,
192                                   unsigned int start_bucket,
193                                   u32 *first_hash);
194 static int ocfs2_prepare_refcount_xattr(struct inode *inode,
195                                         struct ocfs2_dinode *di,
196                                         struct ocfs2_xattr_info *xi,
197                                         struct ocfs2_xattr_search *xis,
198                                         struct ocfs2_xattr_search *xbs,
199                                         struct ocfs2_refcount_tree **ref_tree,
200                                         int *meta_need,
201                                         int *credits);
202
203 static inline u16 ocfs2_xattr_buckets_per_cluster(struct ocfs2_super *osb)
204 {
205         return (1 << osb->s_clustersize_bits) / OCFS2_XATTR_BUCKET_SIZE;
206 }
207
208 static inline u16 ocfs2_blocks_per_xattr_bucket(struct super_block *sb)
209 {
210         return OCFS2_XATTR_BUCKET_SIZE / (1 << sb->s_blocksize_bits);
211 }
212
213 static inline u16 ocfs2_xattr_max_xe_in_bucket(struct super_block *sb)
214 {
215         u16 len = sb->s_blocksize -
216                  offsetof(struct ocfs2_xattr_header, xh_entries);
217
218         return len / sizeof(struct ocfs2_xattr_entry);
219 }
220
221 #define bucket_blkno(_b) ((_b)->bu_bhs[0]->b_blocknr)
222 #define bucket_block(_b, _n) ((_b)->bu_bhs[(_n)]->b_data)
223 #define bucket_xh(_b) ((struct ocfs2_xattr_header *)bucket_block((_b), 0))
224
225 static struct ocfs2_xattr_bucket *ocfs2_xattr_bucket_new(struct inode *inode)
226 {
227         struct ocfs2_xattr_bucket *bucket;
228         int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
229
230         BUG_ON(blks > OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET);
231
232         bucket = kzalloc(sizeof(struct ocfs2_xattr_bucket), GFP_NOFS);
233         if (bucket) {
234                 bucket->bu_inode = inode;
235                 bucket->bu_blocks = blks;
236         }
237
238         return bucket;
239 }
240
241 static void ocfs2_xattr_bucket_relse(struct ocfs2_xattr_bucket *bucket)
242 {
243         int i;
244
245         for (i = 0; i < bucket->bu_blocks; i++) {
246                 brelse(bucket->bu_bhs[i]);
247                 bucket->bu_bhs[i] = NULL;
248         }
249 }
250
251 static void ocfs2_xattr_bucket_free(struct ocfs2_xattr_bucket *bucket)
252 {
253         if (bucket) {
254                 ocfs2_xattr_bucket_relse(bucket);
255                 bucket->bu_inode = NULL;
256                 kfree(bucket);
257         }
258 }
259
260 /*
261  * A bucket that has never been written to disk doesn't need to be
262  * read.  We just need the buffer_heads.  Don't call this for
263  * buckets that are already on disk.  ocfs2_read_xattr_bucket() initializes
264  * them fully.
265  */
266 static int ocfs2_init_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
267                                    u64 xb_blkno)
268 {
269         int i, rc = 0;
270
271         for (i = 0; i < bucket->bu_blocks; i++) {
272                 bucket->bu_bhs[i] = sb_getblk(bucket->bu_inode->i_sb,
273                                               xb_blkno + i);
274                 if (!bucket->bu_bhs[i]) {
275                         rc = -EIO;
276                         mlog_errno(rc);
277                         break;
278                 }
279
280                 if (!ocfs2_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
281                                            bucket->bu_bhs[i]))
282                         ocfs2_set_new_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
283                                                       bucket->bu_bhs[i]);
284         }
285
286         if (rc)
287                 ocfs2_xattr_bucket_relse(bucket);
288         return rc;
289 }
290
291 /* Read the xattr bucket at xb_blkno */
292 static int ocfs2_read_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
293                                    u64 xb_blkno)
294 {
295         int rc;
296
297         rc = ocfs2_read_blocks(INODE_CACHE(bucket->bu_inode), xb_blkno,
298                                bucket->bu_blocks, bucket->bu_bhs, 0,
299                                NULL);
300         if (!rc) {
301                 spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
302                 rc = ocfs2_validate_meta_ecc_bhs(bucket->bu_inode->i_sb,
303                                                  bucket->bu_bhs,
304                                                  bucket->bu_blocks,
305                                                  &bucket_xh(bucket)->xh_check);
306                 spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
307                 if (rc)
308                         mlog_errno(rc);
309         }
310
311         if (rc)
312                 ocfs2_xattr_bucket_relse(bucket);
313         return rc;
314 }
315
316 static int ocfs2_xattr_bucket_journal_access(handle_t *handle,
317                                              struct ocfs2_xattr_bucket *bucket,
318                                              int type)
319 {
320         int i, rc = 0;
321
322         for (i = 0; i < bucket->bu_blocks; i++) {
323                 rc = ocfs2_journal_access(handle,
324                                           INODE_CACHE(bucket->bu_inode),
325                                           bucket->bu_bhs[i], type);
326                 if (rc) {
327                         mlog_errno(rc);
328                         break;
329                 }
330         }
331
332         return rc;
333 }
334
335 static void ocfs2_xattr_bucket_journal_dirty(handle_t *handle,
336                                              struct ocfs2_xattr_bucket *bucket)
337 {
338         int i;
339
340         spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
341         ocfs2_compute_meta_ecc_bhs(bucket->bu_inode->i_sb,
342                                    bucket->bu_bhs, bucket->bu_blocks,
343                                    &bucket_xh(bucket)->xh_check);
344         spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
345
346         for (i = 0; i < bucket->bu_blocks; i++)
347                 ocfs2_journal_dirty(handle, bucket->bu_bhs[i]);
348 }
349
350 static void ocfs2_xattr_bucket_copy_data(struct ocfs2_xattr_bucket *dest,
351                                          struct ocfs2_xattr_bucket *src)
352 {
353         int i;
354         int blocksize = src->bu_inode->i_sb->s_blocksize;
355
356         BUG_ON(dest->bu_blocks != src->bu_blocks);
357         BUG_ON(dest->bu_inode != src->bu_inode);
358
359         for (i = 0; i < src->bu_blocks; i++) {
360                 memcpy(bucket_block(dest, i), bucket_block(src, i),
361                        blocksize);
362         }
363 }
364
365 static int ocfs2_validate_xattr_block(struct super_block *sb,
366                                       struct buffer_head *bh)
367 {
368         int rc;
369         struct ocfs2_xattr_block *xb =
370                 (struct ocfs2_xattr_block *)bh->b_data;
371
372         mlog(0, "Validating xattr block %llu\n",
373              (unsigned long long)bh->b_blocknr);
374
375         BUG_ON(!buffer_uptodate(bh));
376
377         /*
378          * If the ecc fails, we return the error but otherwise
379          * leave the filesystem running.  We know any error is
380          * local to this block.
381          */
382         rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &xb->xb_check);
383         if (rc)
384                 return rc;
385
386         /*
387          * Errors after here are fatal
388          */
389
390         if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
391                 ocfs2_error(sb,
392                             "Extended attribute block #%llu has bad "
393                             "signature %.*s",
394                             (unsigned long long)bh->b_blocknr, 7,
395                             xb->xb_signature);
396                 return -EINVAL;
397         }
398
399         if (le64_to_cpu(xb->xb_blkno) != bh->b_blocknr) {
400                 ocfs2_error(sb,
401                             "Extended attribute block #%llu has an "
402                             "invalid xb_blkno of %llu",
403                             (unsigned long long)bh->b_blocknr,
404                             (unsigned long long)le64_to_cpu(xb->xb_blkno));
405                 return -EINVAL;
406         }
407
408         if (le32_to_cpu(xb->xb_fs_generation) != OCFS2_SB(sb)->fs_generation) {
409                 ocfs2_error(sb,
410                             "Extended attribute block #%llu has an invalid "
411                             "xb_fs_generation of #%u",
412                             (unsigned long long)bh->b_blocknr,
413                             le32_to_cpu(xb->xb_fs_generation));
414                 return -EINVAL;
415         }
416
417         return 0;
418 }
419
420 static int ocfs2_read_xattr_block(struct inode *inode, u64 xb_blkno,
421                                   struct buffer_head **bh)
422 {
423         int rc;
424         struct buffer_head *tmp = *bh;
425
426         rc = ocfs2_read_block(INODE_CACHE(inode), xb_blkno, &tmp,
427                               ocfs2_validate_xattr_block);
428
429         /* If ocfs2_read_block() got us a new bh, pass it up. */
430         if (!rc && !*bh)
431                 *bh = tmp;
432
433         return rc;
434 }
435
436 static inline const char *ocfs2_xattr_prefix(int name_index)
437 {
438         struct xattr_handler *handler = NULL;
439
440         if (name_index > 0 && name_index < OCFS2_XATTR_MAX)
441                 handler = ocfs2_xattr_handler_map[name_index];
442
443         return handler ? handler->prefix : NULL;
444 }
445
446 static u32 ocfs2_xattr_name_hash(struct inode *inode,
447                                  const char *name,
448                                  int name_len)
449 {
450         /* Get hash value of uuid from super block */
451         u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash;
452         int i;
453
454         /* hash extended attribute name */
455         for (i = 0; i < name_len; i++) {
456                 hash = (hash << OCFS2_HASH_SHIFT) ^
457                        (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
458                        *name++;
459         }
460
461         return hash;
462 }
463
464 /*
465  * ocfs2_xattr_hash_entry()
466  *
467  * Compute the hash of an extended attribute.
468  */
469 static void ocfs2_xattr_hash_entry(struct inode *inode,
470                                    struct ocfs2_xattr_header *header,
471                                    struct ocfs2_xattr_entry *entry)
472 {
473         u32 hash = 0;
474         char *name = (char *)header + le16_to_cpu(entry->xe_name_offset);
475
476         hash = ocfs2_xattr_name_hash(inode, name, entry->xe_name_len);
477         entry->xe_name_hash = cpu_to_le32(hash);
478
479         return;
480 }
481
482 static int ocfs2_xattr_entry_real_size(int name_len, size_t value_len)
483 {
484         int size = 0;
485
486         if (value_len <= OCFS2_XATTR_INLINE_SIZE)
487                 size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(value_len);
488         else
489                 size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
490         size += sizeof(struct ocfs2_xattr_entry);
491
492         return size;
493 }
494
495 int ocfs2_calc_security_init(struct inode *dir,
496                              struct ocfs2_security_xattr_info *si,
497                              int *want_clusters,
498                              int *xattr_credits,
499                              struct ocfs2_alloc_context **xattr_ac)
500 {
501         int ret = 0;
502         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
503         int s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
504                                                  si->value_len);
505
506         /*
507          * The max space of security xattr taken inline is
508          * 256(name) + 80(value) + 16(entry) = 352 bytes,
509          * So reserve one metadata block for it is ok.
510          */
511         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
512             s_size > OCFS2_XATTR_FREE_IN_IBODY) {
513                 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, xattr_ac);
514                 if (ret) {
515                         mlog_errno(ret);
516                         return ret;
517                 }
518                 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
519         }
520
521         /* reserve clusters for xattr value which will be set in B tree*/
522         if (si->value_len > OCFS2_XATTR_INLINE_SIZE) {
523                 int new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
524                                                             si->value_len);
525
526                 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
527                                                            new_clusters);
528                 *want_clusters += new_clusters;
529         }
530         return ret;
531 }
532
533 int ocfs2_calc_xattr_init(struct inode *dir,
534                           struct buffer_head *dir_bh,
535                           int mode,
536                           struct ocfs2_security_xattr_info *si,
537                           int *want_clusters,
538                           int *xattr_credits,
539                           int *want_meta)
540 {
541         int ret = 0;
542         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
543         int s_size = 0, a_size = 0, acl_len = 0, new_clusters;
544
545         if (si->enable)
546                 s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
547                                                      si->value_len);
548
549         if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
550                 acl_len = ocfs2_xattr_get_nolock(dir, dir_bh,
551                                         OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT,
552                                         "", NULL, 0);
553                 if (acl_len > 0) {
554                         a_size = ocfs2_xattr_entry_real_size(0, acl_len);
555                         if (S_ISDIR(mode))
556                                 a_size <<= 1;
557                 } else if (acl_len != 0 && acl_len != -ENODATA) {
558                         mlog_errno(ret);
559                         return ret;
560                 }
561         }
562
563         if (!(s_size + a_size))
564                 return ret;
565
566         /*
567          * The max space of security xattr taken inline is
568          * 256(name) + 80(value) + 16(entry) = 352 bytes,
569          * The max space of acl xattr taken inline is
570          * 80(value) + 16(entry) * 2(if directory) = 192 bytes,
571          * when blocksize = 512, may reserve one more cluser for
572          * xattr bucket, otherwise reserve one metadata block
573          * for them is ok.
574          * If this is a new directory with inline data,
575          * we choose to reserve the entire inline area for
576          * directory contents and force an external xattr block.
577          */
578         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
579             (S_ISDIR(mode) && ocfs2_supports_inline_data(osb)) ||
580             (s_size + a_size) > OCFS2_XATTR_FREE_IN_IBODY) {
581                 *want_meta = *want_meta + 1;
582                 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
583         }
584
585         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE &&
586             (s_size + a_size) > OCFS2_XATTR_FREE_IN_BLOCK(dir)) {
587                 *want_clusters += 1;
588                 *xattr_credits += ocfs2_blocks_per_xattr_bucket(dir->i_sb);
589         }
590
591         /*
592          * reserve credits and clusters for xattrs which has large value
593          * and have to be set outside
594          */
595         if (si->enable && si->value_len > OCFS2_XATTR_INLINE_SIZE) {
596                 new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
597                                                         si->value_len);
598                 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
599                                                            new_clusters);
600                 *want_clusters += new_clusters;
601         }
602         if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL &&
603             acl_len > OCFS2_XATTR_INLINE_SIZE) {
604                 /* for directory, it has DEFAULT and ACCESS two types of acls */
605                 new_clusters = (S_ISDIR(mode) ? 2 : 1) *
606                                 ocfs2_clusters_for_bytes(dir->i_sb, acl_len);
607                 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
608                                                            new_clusters);
609                 *want_clusters += new_clusters;
610         }
611
612         return ret;
613 }
614
615 static int ocfs2_xattr_extend_allocation(struct inode *inode,
616                                          u32 clusters_to_add,
617                                          struct ocfs2_xattr_value_buf *vb,
618                                          struct ocfs2_xattr_set_ctxt *ctxt)
619 {
620         int status = 0;
621         handle_t *handle = ctxt->handle;
622         enum ocfs2_alloc_restarted why;
623         u32 prev_clusters, logical_start = le32_to_cpu(vb->vb_xv->xr_clusters);
624         struct ocfs2_extent_tree et;
625
626         mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add);
627
628         ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
629
630         status = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
631                               OCFS2_JOURNAL_ACCESS_WRITE);
632         if (status < 0) {
633                 mlog_errno(status);
634                 goto leave;
635         }
636
637         prev_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
638         status = ocfs2_add_clusters_in_btree(handle,
639                                              &et,
640                                              &logical_start,
641                                              clusters_to_add,
642                                              0,
643                                              ctxt->data_ac,
644                                              ctxt->meta_ac,
645                                              &why);
646         if (status < 0) {
647                 mlog_errno(status);
648                 goto leave;
649         }
650
651         status = ocfs2_journal_dirty(handle, vb->vb_bh);
652         if (status < 0) {
653                 mlog_errno(status);
654                 goto leave;
655         }
656
657         clusters_to_add -= le32_to_cpu(vb->vb_xv->xr_clusters) - prev_clusters;
658
659         /*
660          * We should have already allocated enough space before the transaction,
661          * so no need to restart.
662          */
663         BUG_ON(why != RESTART_NONE || clusters_to_add);
664
665 leave:
666
667         return status;
668 }
669
670 static int __ocfs2_remove_xattr_range(struct inode *inode,
671                                       struct ocfs2_xattr_value_buf *vb,
672                                       u32 cpos, u32 phys_cpos, u32 len,
673                                       unsigned int ext_flags,
674                                       struct ocfs2_xattr_set_ctxt *ctxt)
675 {
676         int ret;
677         u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
678         handle_t *handle = ctxt->handle;
679         struct ocfs2_extent_tree et;
680
681         ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
682
683         ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
684                             OCFS2_JOURNAL_ACCESS_WRITE);
685         if (ret) {
686                 mlog_errno(ret);
687                 goto out;
688         }
689
690         ret = ocfs2_remove_extent(handle, &et, cpos, len, ctxt->meta_ac,
691                                   &ctxt->dealloc);
692         if (ret) {
693                 mlog_errno(ret);
694                 goto out;
695         }
696
697         le32_add_cpu(&vb->vb_xv->xr_clusters, -len);
698
699         ret = ocfs2_journal_dirty(handle, vb->vb_bh);
700         if (ret) {
701                 mlog_errno(ret);
702                 goto out;
703         }
704
705         if (ext_flags & OCFS2_EXT_REFCOUNTED)
706                 ret = ocfs2_decrease_refcount(inode, handle,
707                                         ocfs2_blocks_to_clusters(inode->i_sb,
708                                                                  phys_blkno),
709                                         len, ctxt->meta_ac, &ctxt->dealloc, 1);
710         else
711                 ret = ocfs2_cache_cluster_dealloc(&ctxt->dealloc,
712                                                   phys_blkno, len);
713         if (ret)
714                 mlog_errno(ret);
715
716 out:
717         return ret;
718 }
719
720 static int ocfs2_xattr_shrink_size(struct inode *inode,
721                                    u32 old_clusters,
722                                    u32 new_clusters,
723                                    struct ocfs2_xattr_value_buf *vb,
724                                    struct ocfs2_xattr_set_ctxt *ctxt)
725 {
726         int ret = 0;
727         unsigned int ext_flags;
728         u32 trunc_len, cpos, phys_cpos, alloc_size;
729         u64 block;
730
731         if (old_clusters <= new_clusters)
732                 return 0;
733
734         cpos = new_clusters;
735         trunc_len = old_clusters - new_clusters;
736         while (trunc_len) {
737                 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
738                                                &alloc_size,
739                                                &vb->vb_xv->xr_list, &ext_flags);
740                 if (ret) {
741                         mlog_errno(ret);
742                         goto out;
743                 }
744
745                 if (alloc_size > trunc_len)
746                         alloc_size = trunc_len;
747
748                 ret = __ocfs2_remove_xattr_range(inode, vb, cpos,
749                                                  phys_cpos, alloc_size,
750                                                  ext_flags, ctxt);
751                 if (ret) {
752                         mlog_errno(ret);
753                         goto out;
754                 }
755
756                 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
757                 ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode),
758                                                        block, alloc_size);
759                 cpos += alloc_size;
760                 trunc_len -= alloc_size;
761         }
762
763 out:
764         return ret;
765 }
766
767 static int ocfs2_xattr_value_truncate(struct inode *inode,
768                                       struct ocfs2_xattr_value_buf *vb,
769                                       int len,
770                                       struct ocfs2_xattr_set_ctxt *ctxt)
771 {
772         int ret;
773         u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
774         u32 old_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
775
776         if (new_clusters == old_clusters)
777                 return 0;
778
779         if (new_clusters > old_clusters)
780                 ret = ocfs2_xattr_extend_allocation(inode,
781                                                     new_clusters - old_clusters,
782                                                     vb, ctxt);
783         else
784                 ret = ocfs2_xattr_shrink_size(inode,
785                                               old_clusters, new_clusters,
786                                               vb, ctxt);
787
788         return ret;
789 }
790
791 static int ocfs2_xattr_list_entry(char *buffer, size_t size,
792                                   size_t *result, const char *prefix,
793                                   const char *name, int name_len)
794 {
795         char *p = buffer + *result;
796         int prefix_len = strlen(prefix);
797         int total_len = prefix_len + name_len + 1;
798
799         *result += total_len;
800
801         /* we are just looking for how big our buffer needs to be */
802         if (!size)
803                 return 0;
804
805         if (*result > size)
806                 return -ERANGE;
807
808         memcpy(p, prefix, prefix_len);
809         memcpy(p + prefix_len, name, name_len);
810         p[prefix_len + name_len] = '\0';
811
812         return 0;
813 }
814
815 static int ocfs2_xattr_list_entries(struct inode *inode,
816                                     struct ocfs2_xattr_header *header,
817                                     char *buffer, size_t buffer_size)
818 {
819         size_t result = 0;
820         int i, type, ret;
821         const char *prefix, *name;
822
823         for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
824                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
825                 type = ocfs2_xattr_get_type(entry);
826                 prefix = ocfs2_xattr_prefix(type);
827
828                 if (prefix) {
829                         name = (const char *)header +
830                                 le16_to_cpu(entry->xe_name_offset);
831
832                         ret = ocfs2_xattr_list_entry(buffer, buffer_size,
833                                                      &result, prefix, name,
834                                                      entry->xe_name_len);
835                         if (ret)
836                                 return ret;
837                 }
838         }
839
840         return result;
841 }
842
843 static int ocfs2_xattr_ibody_list(struct inode *inode,
844                                   struct ocfs2_dinode *di,
845                                   char *buffer,
846                                   size_t buffer_size)
847 {
848         struct ocfs2_xattr_header *header = NULL;
849         struct ocfs2_inode_info *oi = OCFS2_I(inode);
850         int ret = 0;
851
852         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
853                 return ret;
854
855         header = (struct ocfs2_xattr_header *)
856                  ((void *)di + inode->i_sb->s_blocksize -
857                  le16_to_cpu(di->i_xattr_inline_size));
858
859         ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size);
860
861         return ret;
862 }
863
864 static int ocfs2_xattr_block_list(struct inode *inode,
865                                   struct ocfs2_dinode *di,
866                                   char *buffer,
867                                   size_t buffer_size)
868 {
869         struct buffer_head *blk_bh = NULL;
870         struct ocfs2_xattr_block *xb;
871         int ret = 0;
872
873         if (!di->i_xattr_loc)
874                 return ret;
875
876         ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
877                                      &blk_bh);
878         if (ret < 0) {
879                 mlog_errno(ret);
880                 return ret;
881         }
882
883         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
884         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
885                 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
886                 ret = ocfs2_xattr_list_entries(inode, header,
887                                                buffer, buffer_size);
888         } else
889                 ret = ocfs2_xattr_tree_list_index_block(inode, blk_bh,
890                                                    buffer, buffer_size);
891
892         brelse(blk_bh);
893
894         return ret;
895 }
896
897 ssize_t ocfs2_listxattr(struct dentry *dentry,
898                         char *buffer,
899                         size_t size)
900 {
901         int ret = 0, i_ret = 0, b_ret = 0;
902         struct buffer_head *di_bh = NULL;
903         struct ocfs2_dinode *di = NULL;
904         struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode);
905
906         if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
907                 return -EOPNOTSUPP;
908
909         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
910                 return ret;
911
912         ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0);
913         if (ret < 0) {
914                 mlog_errno(ret);
915                 return ret;
916         }
917
918         di = (struct ocfs2_dinode *)di_bh->b_data;
919
920         down_read(&oi->ip_xattr_sem);
921         i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size);
922         if (i_ret < 0)
923                 b_ret = 0;
924         else {
925                 if (buffer) {
926                         buffer += i_ret;
927                         size -= i_ret;
928                 }
929                 b_ret = ocfs2_xattr_block_list(dentry->d_inode, di,
930                                                buffer, size);
931                 if (b_ret < 0)
932                         i_ret = 0;
933         }
934         up_read(&oi->ip_xattr_sem);
935         ocfs2_inode_unlock(dentry->d_inode, 0);
936
937         brelse(di_bh);
938
939         return i_ret + b_ret;
940 }
941
942 static int ocfs2_xattr_find_entry(int name_index,
943                                   const char *name,
944                                   struct ocfs2_xattr_search *xs)
945 {
946         struct ocfs2_xattr_entry *entry;
947         size_t name_len;
948         int i, cmp = 1;
949
950         if (name == NULL)
951                 return -EINVAL;
952
953         name_len = strlen(name);
954         entry = xs->here;
955         for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
956                 cmp = name_index - ocfs2_xattr_get_type(entry);
957                 if (!cmp)
958                         cmp = name_len - entry->xe_name_len;
959                 if (!cmp)
960                         cmp = memcmp(name, (xs->base +
961                                      le16_to_cpu(entry->xe_name_offset)),
962                                      name_len);
963                 if (cmp == 0)
964                         break;
965                 entry += 1;
966         }
967         xs->here = entry;
968
969         return cmp ? -ENODATA : 0;
970 }
971
972 static int ocfs2_xattr_get_value_outside(struct inode *inode,
973                                          struct ocfs2_xattr_value_root *xv,
974                                          void *buffer,
975                                          size_t len)
976 {
977         u32 cpos, p_cluster, num_clusters, bpc, clusters;
978         u64 blkno;
979         int i, ret = 0;
980         size_t cplen, blocksize;
981         struct buffer_head *bh = NULL;
982         struct ocfs2_extent_list *el;
983
984         el = &xv->xr_list;
985         clusters = le32_to_cpu(xv->xr_clusters);
986         bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
987         blocksize = inode->i_sb->s_blocksize;
988
989         cpos = 0;
990         while (cpos < clusters) {
991                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
992                                                &num_clusters, el, NULL);
993                 if (ret) {
994                         mlog_errno(ret);
995                         goto out;
996                 }
997
998                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
999                 /* Copy ocfs2_xattr_value */
1000                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1001                         ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
1002                                                &bh, NULL);
1003                         if (ret) {
1004                                 mlog_errno(ret);
1005                                 goto out;
1006                         }
1007
1008                         cplen = len >= blocksize ? blocksize : len;
1009                         memcpy(buffer, bh->b_data, cplen);
1010                         len -= cplen;
1011                         buffer += cplen;
1012
1013                         brelse(bh);
1014                         bh = NULL;
1015                         if (len == 0)
1016                                 break;
1017                 }
1018                 cpos += num_clusters;
1019         }
1020 out:
1021         return ret;
1022 }
1023
1024 static int ocfs2_xattr_ibody_get(struct inode *inode,
1025                                  int name_index,
1026                                  const char *name,
1027                                  void *buffer,
1028                                  size_t buffer_size,
1029                                  struct ocfs2_xattr_search *xs)
1030 {
1031         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1032         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1033         struct ocfs2_xattr_value_root *xv;
1034         size_t size;
1035         int ret = 0;
1036
1037         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
1038                 return -ENODATA;
1039
1040         xs->end = (void *)di + inode->i_sb->s_blocksize;
1041         xs->header = (struct ocfs2_xattr_header *)
1042                         (xs->end - le16_to_cpu(di->i_xattr_inline_size));
1043         xs->base = (void *)xs->header;
1044         xs->here = xs->header->xh_entries;
1045
1046         ret = ocfs2_xattr_find_entry(name_index, name, xs);
1047         if (ret)
1048                 return ret;
1049         size = le64_to_cpu(xs->here->xe_value_size);
1050         if (buffer) {
1051                 if (size > buffer_size)
1052                         return -ERANGE;
1053                 if (ocfs2_xattr_is_local(xs->here)) {
1054                         memcpy(buffer, (void *)xs->base +
1055                                le16_to_cpu(xs->here->xe_name_offset) +
1056                                OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
1057                 } else {
1058                         xv = (struct ocfs2_xattr_value_root *)
1059                                 (xs->base + le16_to_cpu(
1060                                  xs->here->xe_name_offset) +
1061                                 OCFS2_XATTR_SIZE(xs->here->xe_name_len));
1062                         ret = ocfs2_xattr_get_value_outside(inode, xv,
1063                                                             buffer, size);
1064                         if (ret < 0) {
1065                                 mlog_errno(ret);
1066                                 return ret;
1067                         }
1068                 }
1069         }
1070
1071         return size;
1072 }
1073
1074 static int ocfs2_xattr_block_get(struct inode *inode,
1075                                  int name_index,
1076                                  const char *name,
1077                                  void *buffer,
1078                                  size_t buffer_size,
1079                                  struct ocfs2_xattr_search *xs)
1080 {
1081         struct ocfs2_xattr_block *xb;
1082         struct ocfs2_xattr_value_root *xv;
1083         size_t size;
1084         int ret = -ENODATA, name_offset, name_len, i;
1085         int uninitialized_var(block_off);
1086
1087         xs->bucket = ocfs2_xattr_bucket_new(inode);
1088         if (!xs->bucket) {
1089                 ret = -ENOMEM;
1090                 mlog_errno(ret);
1091                 goto cleanup;
1092         }
1093
1094         ret = ocfs2_xattr_block_find(inode, name_index, name, xs);
1095         if (ret) {
1096                 mlog_errno(ret);
1097                 goto cleanup;
1098         }
1099
1100         if (xs->not_found) {
1101                 ret = -ENODATA;
1102                 goto cleanup;
1103         }
1104
1105         xb = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1106         size = le64_to_cpu(xs->here->xe_value_size);
1107         if (buffer) {
1108                 ret = -ERANGE;
1109                 if (size > buffer_size)
1110                         goto cleanup;
1111
1112                 name_offset = le16_to_cpu(xs->here->xe_name_offset);
1113                 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
1114                 i = xs->here - xs->header->xh_entries;
1115
1116                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
1117                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
1118                                                                 bucket_xh(xs->bucket),
1119                                                                 i,
1120                                                                 &block_off,
1121                                                                 &name_offset);
1122                         xs->base = bucket_block(xs->bucket, block_off);
1123                 }
1124                 if (ocfs2_xattr_is_local(xs->here)) {
1125                         memcpy(buffer, (void *)xs->base +
1126                                name_offset + name_len, size);
1127                 } else {
1128                         xv = (struct ocfs2_xattr_value_root *)
1129                                 (xs->base + name_offset + name_len);
1130                         ret = ocfs2_xattr_get_value_outside(inode, xv,
1131                                                             buffer, size);
1132                         if (ret < 0) {
1133                                 mlog_errno(ret);
1134                                 goto cleanup;
1135                         }
1136                 }
1137         }
1138         ret = size;
1139 cleanup:
1140         ocfs2_xattr_bucket_free(xs->bucket);
1141
1142         brelse(xs->xattr_bh);
1143         xs->xattr_bh = NULL;
1144         return ret;
1145 }
1146
1147 int ocfs2_xattr_get_nolock(struct inode *inode,
1148                            struct buffer_head *di_bh,
1149                            int name_index,
1150                            const char *name,
1151                            void *buffer,
1152                            size_t buffer_size)
1153 {
1154         int ret;
1155         struct ocfs2_dinode *di = NULL;
1156         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1157         struct ocfs2_xattr_search xis = {
1158                 .not_found = -ENODATA,
1159         };
1160         struct ocfs2_xattr_search xbs = {
1161                 .not_found = -ENODATA,
1162         };
1163
1164         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1165                 return -EOPNOTSUPP;
1166
1167         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1168                 ret = -ENODATA;
1169
1170         xis.inode_bh = xbs.inode_bh = di_bh;
1171         di = (struct ocfs2_dinode *)di_bh->b_data;
1172
1173         down_read(&oi->ip_xattr_sem);
1174         ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
1175                                     buffer_size, &xis);
1176         if (ret == -ENODATA && di->i_xattr_loc)
1177                 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
1178                                             buffer_size, &xbs);
1179         up_read(&oi->ip_xattr_sem);
1180
1181         return ret;
1182 }
1183
1184 /* ocfs2_xattr_get()
1185  *
1186  * Copy an extended attribute into the buffer provided.
1187  * Buffer is NULL to compute the size of buffer required.
1188  */
1189 static int ocfs2_xattr_get(struct inode *inode,
1190                            int name_index,
1191                            const char *name,
1192                            void *buffer,
1193                            size_t buffer_size)
1194 {
1195         int ret;
1196         struct buffer_head *di_bh = NULL;
1197
1198         ret = ocfs2_inode_lock(inode, &di_bh, 0);
1199         if (ret < 0) {
1200                 mlog_errno(ret);
1201                 return ret;
1202         }
1203         ret = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
1204                                      name, buffer, buffer_size);
1205
1206         ocfs2_inode_unlock(inode, 0);
1207
1208         brelse(di_bh);
1209
1210         return ret;
1211 }
1212
1213 static int __ocfs2_xattr_set_value_outside(struct inode *inode,
1214                                            handle_t *handle,
1215                                            struct ocfs2_xattr_value_buf *vb,
1216                                            const void *value,
1217                                            int value_len)
1218 {
1219         int ret = 0, i, cp_len;
1220         u16 blocksize = inode->i_sb->s_blocksize;
1221         u32 p_cluster, num_clusters;
1222         u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1223         u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
1224         u64 blkno;
1225         struct buffer_head *bh = NULL;
1226         unsigned int ext_flags;
1227         struct ocfs2_xattr_value_root *xv = vb->vb_xv;
1228
1229         BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
1230
1231         while (cpos < clusters) {
1232                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
1233                                                &num_clusters, &xv->xr_list,
1234                                                &ext_flags);
1235                 if (ret) {
1236                         mlog_errno(ret);
1237                         goto out;
1238                 }
1239
1240                 BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
1241
1242                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
1243
1244                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1245                         ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
1246                                                &bh, NULL);
1247                         if (ret) {
1248                                 mlog_errno(ret);
1249                                 goto out;
1250                         }
1251
1252                         ret = ocfs2_journal_access(handle,
1253                                                    INODE_CACHE(inode),
1254                                                    bh,
1255                                                    OCFS2_JOURNAL_ACCESS_WRITE);
1256                         if (ret < 0) {
1257                                 mlog_errno(ret);
1258                                 goto out;
1259                         }
1260
1261                         cp_len = value_len > blocksize ? blocksize : value_len;
1262                         memcpy(bh->b_data, value, cp_len);
1263                         value_len -= cp_len;
1264                         value += cp_len;
1265                         if (cp_len < blocksize)
1266                                 memset(bh->b_data + cp_len, 0,
1267                                        blocksize - cp_len);
1268
1269                         ret = ocfs2_journal_dirty(handle, bh);
1270                         if (ret < 0) {
1271                                 mlog_errno(ret);
1272                                 goto out;
1273                         }
1274                         brelse(bh);
1275                         bh = NULL;
1276
1277                         /*
1278                          * XXX: do we need to empty all the following
1279                          * blocks in this cluster?
1280                          */
1281                         if (!value_len)
1282                                 break;
1283                 }
1284                 cpos += num_clusters;
1285         }
1286 out:
1287         brelse(bh);
1288
1289         return ret;
1290 }
1291
1292 static int ocfs2_xattr_cleanup(struct inode *inode,
1293                                handle_t *handle,
1294                                struct ocfs2_xattr_info *xi,
1295                                struct ocfs2_xattr_search *xs,
1296                                struct ocfs2_xattr_value_buf *vb,
1297                                size_t offs)
1298 {
1299         int ret = 0;
1300         size_t name_len = strlen(xi->name);
1301         void *val = xs->base + offs;
1302         size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1303
1304         ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
1305                             OCFS2_JOURNAL_ACCESS_WRITE);
1306         if (ret) {
1307                 mlog_errno(ret);
1308                 goto out;
1309         }
1310         /* Decrease xattr count */
1311         le16_add_cpu(&xs->header->xh_count, -1);
1312         /* Remove the xattr entry and tree root which has already be set*/
1313         memset((void *)xs->here, 0, sizeof(struct ocfs2_xattr_entry));
1314         memset(val, 0, size);
1315
1316         ret = ocfs2_journal_dirty(handle, vb->vb_bh);
1317         if (ret < 0)
1318                 mlog_errno(ret);
1319 out:
1320         return ret;
1321 }
1322
1323 static int ocfs2_xattr_update_entry(struct inode *inode,
1324                                     handle_t *handle,
1325                                     struct ocfs2_xattr_info *xi,
1326                                     struct ocfs2_xattr_search *xs,
1327                                     struct ocfs2_xattr_value_buf *vb,
1328                                     size_t offs)
1329 {
1330         int ret;
1331
1332         ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
1333                             OCFS2_JOURNAL_ACCESS_WRITE);
1334         if (ret) {
1335                 mlog_errno(ret);
1336                 goto out;
1337         }
1338
1339         xs->here->xe_name_offset = cpu_to_le16(offs);
1340         xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1341         if (xi->value_len <= OCFS2_XATTR_INLINE_SIZE)
1342                 ocfs2_xattr_set_local(xs->here, 1);
1343         else
1344                 ocfs2_xattr_set_local(xs->here, 0);
1345         ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1346
1347         ret = ocfs2_journal_dirty(handle, vb->vb_bh);
1348         if (ret < 0)
1349                 mlog_errno(ret);
1350 out:
1351         return ret;
1352 }
1353
1354 /*
1355  * ocfs2_xattr_set_value_outside()
1356  *
1357  * Set large size value in B tree.
1358  */
1359 static int ocfs2_xattr_set_value_outside(struct inode *inode,
1360                                          struct ocfs2_xattr_info *xi,
1361                                          struct ocfs2_xattr_search *xs,
1362                                          struct ocfs2_xattr_set_ctxt *ctxt,
1363                                          struct ocfs2_xattr_value_buf *vb,
1364                                          size_t offs)
1365 {
1366         size_t name_len = strlen(xi->name);
1367         void *val = xs->base + offs;
1368         struct ocfs2_xattr_value_root *xv = NULL;
1369         size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1370         int ret = 0;
1371
1372         memset(val, 0, size);
1373         memcpy(val, xi->name, name_len);
1374         xv = (struct ocfs2_xattr_value_root *)
1375                 (val + OCFS2_XATTR_SIZE(name_len));
1376         xv->xr_clusters = 0;
1377         xv->xr_last_eb_blk = 0;
1378         xv->xr_list.l_tree_depth = 0;
1379         xv->xr_list.l_count = cpu_to_le16(1);
1380         xv->xr_list.l_next_free_rec = 0;
1381         vb->vb_xv = xv;
1382
1383         ret = ocfs2_xattr_value_truncate(inode, vb, xi->value_len, ctxt);
1384         if (ret < 0) {
1385                 mlog_errno(ret);
1386                 return ret;
1387         }
1388         ret = ocfs2_xattr_update_entry(inode, ctxt->handle, xi, xs, vb, offs);
1389         if (ret < 0) {
1390                 mlog_errno(ret);
1391                 return ret;
1392         }
1393         ret = __ocfs2_xattr_set_value_outside(inode, ctxt->handle, vb,
1394                                               xi->value, xi->value_len);
1395         if (ret < 0)
1396                 mlog_errno(ret);
1397
1398         return ret;
1399 }
1400
1401 /*
1402  * ocfs2_xattr_set_entry_local()
1403  *
1404  * Set, replace or remove extended attribute in local.
1405  */
1406 static void ocfs2_xattr_set_entry_local(struct inode *inode,
1407                                         struct ocfs2_xattr_info *xi,
1408                                         struct ocfs2_xattr_search *xs,
1409                                         struct ocfs2_xattr_entry *last,
1410                                         size_t min_offs)
1411 {
1412         size_t name_len = strlen(xi->name);
1413         int i;
1414
1415         if (xi->value && xs->not_found) {
1416                 /* Insert the new xattr entry. */
1417                 le16_add_cpu(&xs->header->xh_count, 1);
1418                 ocfs2_xattr_set_type(last, xi->name_index);
1419                 ocfs2_xattr_set_local(last, 1);
1420                 last->xe_name_len = name_len;
1421         } else {
1422                 void *first_val;
1423                 void *val;
1424                 size_t offs, size;
1425
1426                 first_val = xs->base + min_offs;
1427                 offs = le16_to_cpu(xs->here->xe_name_offset);
1428                 val = xs->base + offs;
1429
1430                 if (le64_to_cpu(xs->here->xe_value_size) >
1431                     OCFS2_XATTR_INLINE_SIZE)
1432                         size = OCFS2_XATTR_SIZE(name_len) +
1433                                 OCFS2_XATTR_ROOT_SIZE;
1434                 else
1435                         size = OCFS2_XATTR_SIZE(name_len) +
1436                         OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1437
1438                 if (xi->value && size == OCFS2_XATTR_SIZE(name_len) +
1439                                 OCFS2_XATTR_SIZE(xi->value_len)) {
1440                         /* The old and the new value have the
1441                            same size. Just replace the value. */
1442                         ocfs2_xattr_set_local(xs->here, 1);
1443                         xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1444                         /* Clear value bytes. */
1445                         memset(val + OCFS2_XATTR_SIZE(name_len),
1446                                0,
1447                                OCFS2_XATTR_SIZE(xi->value_len));
1448                         memcpy(val + OCFS2_XATTR_SIZE(name_len),
1449                                xi->value,
1450                                xi->value_len);
1451                         return;
1452                 }
1453                 /* Remove the old name+value. */
1454                 memmove(first_val + size, first_val, val - first_val);
1455                 memset(first_val, 0, size);
1456                 xs->here->xe_name_hash = 0;
1457                 xs->here->xe_name_offset = 0;
1458                 ocfs2_xattr_set_local(xs->here, 1);
1459                 xs->here->xe_value_size = 0;
1460
1461                 min_offs += size;
1462
1463                 /* Adjust all value offsets. */
1464                 last = xs->header->xh_entries;
1465                 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1466                         size_t o = le16_to_cpu(last->xe_name_offset);
1467
1468                         if (o < offs)
1469                                 last->xe_name_offset = cpu_to_le16(o + size);
1470                         last += 1;
1471                 }
1472
1473                 if (!xi->value) {
1474                         /* Remove the old entry. */
1475                         last -= 1;
1476                         memmove(xs->here, xs->here + 1,
1477                                 (void *)last - (void *)xs->here);
1478                         memset(last, 0, sizeof(struct ocfs2_xattr_entry));
1479                         le16_add_cpu(&xs->header->xh_count, -1);
1480                 }
1481         }
1482         if (xi->value) {
1483                 /* Insert the new name+value. */
1484                 size_t size = OCFS2_XATTR_SIZE(name_len) +
1485                                 OCFS2_XATTR_SIZE(xi->value_len);
1486                 void *val = xs->base + min_offs - size;
1487
1488                 xs->here->xe_name_offset = cpu_to_le16(min_offs - size);
1489                 memset(val, 0, size);
1490                 memcpy(val, xi->name, name_len);
1491                 memcpy(val + OCFS2_XATTR_SIZE(name_len),
1492                        xi->value,
1493                        xi->value_len);
1494                 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1495                 ocfs2_xattr_set_local(xs->here, 1);
1496                 ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1497         }
1498
1499         return;
1500 }
1501
1502 /*
1503  * ocfs2_xattr_set_entry()
1504  *
1505  * Set extended attribute entry into inode or block.
1506  *
1507  * If extended attribute value size > OCFS2_XATTR_INLINE_SIZE,
1508  * We first insert tree root(ocfs2_xattr_value_root) with set_entry_local(),
1509  * then set value in B tree with set_value_outside().
1510  */
1511 static int ocfs2_xattr_set_entry(struct inode *inode,
1512                                  struct ocfs2_xattr_info *xi,
1513                                  struct ocfs2_xattr_search *xs,
1514                                  struct ocfs2_xattr_set_ctxt *ctxt,
1515                                  int flag)
1516 {
1517         struct ocfs2_xattr_entry *last;
1518         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1519         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1520         size_t min_offs = xs->end - xs->base, name_len = strlen(xi->name);
1521         size_t size_l = 0;
1522         handle_t *handle = ctxt->handle;
1523         int free, i, ret;
1524         struct ocfs2_xattr_info xi_l = {
1525                 .name_index = xi->name_index,
1526                 .name = xi->name,
1527                 .value = xi->value,
1528                 .value_len = xi->value_len,
1529         };
1530         struct ocfs2_xattr_value_buf vb = {
1531                 .vb_bh = xs->xattr_bh,
1532                 .vb_access = ocfs2_journal_access_di,
1533         };
1534
1535         if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1536                 BUG_ON(xs->xattr_bh == xs->inode_bh);
1537                 vb.vb_access = ocfs2_journal_access_xb;
1538         } else
1539                 BUG_ON(xs->xattr_bh != xs->inode_bh);
1540
1541         /* Compute min_offs, last and free space. */
1542         last = xs->header->xh_entries;
1543
1544         for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1545                 size_t offs = le16_to_cpu(last->xe_name_offset);
1546                 if (offs < min_offs)
1547                         min_offs = offs;
1548                 last += 1;
1549         }
1550
1551         free = min_offs - ((void *)last - xs->base) - OCFS2_XATTR_HEADER_GAP;
1552         if (free < 0)
1553                 return -EIO;
1554
1555         if (!xs->not_found) {
1556                 size_t size = 0;
1557                 if (ocfs2_xattr_is_local(xs->here))
1558                         size = OCFS2_XATTR_SIZE(name_len) +
1559                         OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1560                 else
1561                         size = OCFS2_XATTR_SIZE(name_len) +
1562                                 OCFS2_XATTR_ROOT_SIZE;
1563                 free += (size + sizeof(struct ocfs2_xattr_entry));
1564         }
1565         /* Check free space in inode or block */
1566         if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1567                 if (free < sizeof(struct ocfs2_xattr_entry) +
1568                            OCFS2_XATTR_SIZE(name_len) +
1569                            OCFS2_XATTR_ROOT_SIZE) {
1570                         ret = -ENOSPC;
1571                         goto out;
1572                 }
1573                 size_l = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1574                 xi_l.value = (void *)&def_xv;
1575                 xi_l.value_len = OCFS2_XATTR_ROOT_SIZE;
1576         } else if (xi->value) {
1577                 if (free < sizeof(struct ocfs2_xattr_entry) +
1578                            OCFS2_XATTR_SIZE(name_len) +
1579                            OCFS2_XATTR_SIZE(xi->value_len)) {
1580                         ret = -ENOSPC;
1581                         goto out;
1582                 }
1583         }
1584
1585         if (!xs->not_found) {
1586                 /* For existing extended attribute */
1587                 size_t size = OCFS2_XATTR_SIZE(name_len) +
1588                         OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1589                 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1590                 void *val = xs->base + offs;
1591
1592                 if (ocfs2_xattr_is_local(xs->here) && size == size_l) {
1593                         /* Replace existing local xattr with tree root */
1594                         ret = ocfs2_xattr_set_value_outside(inode, xi, xs,
1595                                                             ctxt, &vb, offs);
1596                         if (ret < 0)
1597                                 mlog_errno(ret);
1598                         goto out;
1599                 } else if (!ocfs2_xattr_is_local(xs->here)) {
1600                         /* For existing xattr which has value outside */
1601                         vb.vb_xv = (struct ocfs2_xattr_value_root *)
1602                                 (val + OCFS2_XATTR_SIZE(name_len));
1603
1604                         if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1605                                 /*
1606                                  * If new value need set outside also,
1607                                  * first truncate old value to new value,
1608                                  * then set new value with set_value_outside().
1609                                  */
1610                                 ret = ocfs2_xattr_value_truncate(inode,
1611                                                                  &vb,
1612                                                                  xi->value_len,
1613                                                                  ctxt);
1614                                 if (ret < 0) {
1615                                         mlog_errno(ret);
1616                                         goto out;
1617                                 }
1618
1619                                 ret = ocfs2_xattr_update_entry(inode,
1620                                                                handle,
1621                                                                xi,
1622                                                                xs,
1623                                                                &vb,
1624                                                                offs);
1625                                 if (ret < 0) {
1626                                         mlog_errno(ret);
1627                                         goto out;
1628                                 }
1629
1630                                 ret = __ocfs2_xattr_set_value_outside(inode,
1631                                                                 handle,
1632                                                                 &vb,
1633                                                                 xi->value,
1634                                                                 xi->value_len);
1635                                 if (ret < 0)
1636                                         mlog_errno(ret);
1637                                 goto out;
1638                         } else {
1639                                 /*
1640                                  * If new value need set in local,
1641                                  * just trucate old value to zero.
1642                                  */
1643                                  ret = ocfs2_xattr_value_truncate(inode,
1644                                                                   &vb,
1645                                                                   0,
1646                                                                   ctxt);
1647                                 if (ret < 0)
1648                                         mlog_errno(ret);
1649                         }
1650                 }
1651         }
1652
1653         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), xs->inode_bh,
1654                                       OCFS2_JOURNAL_ACCESS_WRITE);
1655         if (ret) {
1656                 mlog_errno(ret);
1657                 goto out;
1658         }
1659
1660         if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1661                 ret = vb.vb_access(handle, INODE_CACHE(inode), vb.vb_bh,
1662                                    OCFS2_JOURNAL_ACCESS_WRITE);
1663                 if (ret) {
1664                         mlog_errno(ret);
1665                         goto out;
1666                 }
1667         }
1668
1669         /*
1670          * Set value in local, include set tree root in local.
1671          * This is the first step for value size >INLINE_SIZE.
1672          */
1673         ocfs2_xattr_set_entry_local(inode, &xi_l, xs, last, min_offs);
1674
1675         if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1676                 ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
1677                 if (ret < 0) {
1678                         mlog_errno(ret);
1679                         goto out;
1680                 }
1681         }
1682
1683         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) &&
1684             (flag & OCFS2_INLINE_XATTR_FL)) {
1685                 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1686                 unsigned int xattrsize = osb->s_xattr_inline_size;
1687
1688                 /*
1689                  * Adjust extent record count or inline data size
1690                  * to reserve space for extended attribute.
1691                  */
1692                 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1693                         struct ocfs2_inline_data *idata = &di->id2.i_data;
1694                         le16_add_cpu(&idata->id_count, -xattrsize);
1695                 } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
1696                         struct ocfs2_extent_list *el = &di->id2.i_list;
1697                         le16_add_cpu(&el->l_count, -(xattrsize /
1698                                         sizeof(struct ocfs2_extent_rec)));
1699                 }
1700                 di->i_xattr_inline_size = cpu_to_le16(xattrsize);
1701         }
1702         /* Update xattr flag */
1703         spin_lock(&oi->ip_lock);
1704         oi->ip_dyn_features |= flag;
1705         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1706         spin_unlock(&oi->ip_lock);
1707
1708         ret = ocfs2_journal_dirty(handle, xs->inode_bh);
1709         if (ret < 0)
1710                 mlog_errno(ret);
1711
1712         if (!ret && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1713                 /*
1714                  * Set value outside in B tree.
1715                  * This is the second step for value size > INLINE_SIZE.
1716                  */
1717                 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1718                 ret = ocfs2_xattr_set_value_outside(inode, xi, xs, ctxt,
1719                                                     &vb, offs);
1720                 if (ret < 0) {
1721                         int ret2;
1722
1723                         mlog_errno(ret);
1724                         /*
1725                          * If set value outside failed, we have to clean
1726                          * the junk tree root we have already set in local.
1727                          */
1728                         ret2 = ocfs2_xattr_cleanup(inode, ctxt->handle,
1729                                                    xi, xs, &vb, offs);
1730                         if (ret2 < 0)
1731                                 mlog_errno(ret2);
1732                 }
1733         }
1734 out:
1735         return ret;
1736 }
1737
1738 static int ocfs2_remove_value_outside(struct inode*inode,
1739                                       struct ocfs2_xattr_value_buf *vb,
1740                                       struct ocfs2_xattr_header *header)
1741 {
1742         int ret = 0, i;
1743         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1744         struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
1745
1746         ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
1747
1748         ctxt.handle = ocfs2_start_trans(osb,
1749                                         ocfs2_remove_extent_credits(osb->sb));
1750         if (IS_ERR(ctxt.handle)) {
1751                 ret = PTR_ERR(ctxt.handle);
1752                 mlog_errno(ret);
1753                 goto out;
1754         }
1755
1756         for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
1757                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
1758
1759                 if (!ocfs2_xattr_is_local(entry)) {
1760                         void *val;
1761
1762                         val = (void *)header +
1763                                 le16_to_cpu(entry->xe_name_offset);
1764                         vb->vb_xv = (struct ocfs2_xattr_value_root *)
1765                                 (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
1766                         ret = ocfs2_xattr_value_truncate(inode, vb, 0, &ctxt);
1767                         if (ret < 0) {
1768                                 mlog_errno(ret);
1769                                 break;
1770                         }
1771                 }
1772         }
1773
1774         ocfs2_commit_trans(osb, ctxt.handle);
1775         ocfs2_schedule_truncate_log_flush(osb, 1);
1776         ocfs2_run_deallocs(osb, &ctxt.dealloc);
1777 out:
1778         return ret;
1779 }
1780
1781 static int ocfs2_xattr_ibody_remove(struct inode *inode,
1782                                     struct buffer_head *di_bh)
1783 {
1784
1785         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1786         struct ocfs2_xattr_header *header;
1787         int ret;
1788         struct ocfs2_xattr_value_buf vb = {
1789                 .vb_bh = di_bh,
1790                 .vb_access = ocfs2_journal_access_di,
1791         };
1792
1793         header = (struct ocfs2_xattr_header *)
1794                  ((void *)di + inode->i_sb->s_blocksize -
1795                  le16_to_cpu(di->i_xattr_inline_size));
1796
1797         ret = ocfs2_remove_value_outside(inode, &vb, header);
1798
1799         return ret;
1800 }
1801
1802 static int ocfs2_xattr_block_remove(struct inode *inode,
1803                                     struct buffer_head *blk_bh)
1804 {
1805         struct ocfs2_xattr_block *xb;
1806         int ret = 0;
1807         struct ocfs2_xattr_value_buf vb = {
1808                 .vb_bh = blk_bh,
1809                 .vb_access = ocfs2_journal_access_xb,
1810         };
1811
1812         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1813         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
1814                 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
1815                 ret = ocfs2_remove_value_outside(inode, &vb, header);
1816         } else
1817                 ret = ocfs2_iterate_xattr_index_block(inode,
1818                                                 blk_bh,
1819                                                 ocfs2_rm_xattr_cluster,
1820                                                 NULL);
1821
1822         return ret;
1823 }
1824
1825 static int ocfs2_xattr_free_block(struct inode *inode,
1826                                   u64 block)
1827 {
1828         struct inode *xb_alloc_inode;
1829         struct buffer_head *xb_alloc_bh = NULL;
1830         struct buffer_head *blk_bh = NULL;
1831         struct ocfs2_xattr_block *xb;
1832         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1833         handle_t *handle;
1834         int ret = 0;
1835         u64 blk, bg_blkno;
1836         u16 bit;
1837
1838         ret = ocfs2_read_xattr_block(inode, block, &blk_bh);
1839         if (ret < 0) {
1840                 mlog_errno(ret);
1841                 goto out;
1842         }
1843
1844         ret = ocfs2_xattr_block_remove(inode, blk_bh);
1845         if (ret < 0) {
1846                 mlog_errno(ret);
1847                 goto out;
1848         }
1849
1850         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1851         blk = le64_to_cpu(xb->xb_blkno);
1852         bit = le16_to_cpu(xb->xb_suballoc_bit);
1853         bg_blkno = ocfs2_which_suballoc_group(blk, bit);
1854
1855         xb_alloc_inode = ocfs2_get_system_file_inode(osb,
1856                                 EXTENT_ALLOC_SYSTEM_INODE,
1857                                 le16_to_cpu(xb->xb_suballoc_slot));
1858         if (!xb_alloc_inode) {
1859                 ret = -ENOMEM;
1860                 mlog_errno(ret);
1861                 goto out;
1862         }
1863         mutex_lock(&xb_alloc_inode->i_mutex);
1864
1865         ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
1866         if (ret < 0) {
1867                 mlog_errno(ret);
1868                 goto out_mutex;
1869         }
1870
1871         handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
1872         if (IS_ERR(handle)) {
1873                 ret = PTR_ERR(handle);
1874                 mlog_errno(ret);
1875                 goto out_unlock;
1876         }
1877
1878         ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
1879                                        bit, bg_blkno, 1);
1880         if (ret < 0)
1881                 mlog_errno(ret);
1882
1883         ocfs2_commit_trans(osb, handle);
1884 out_unlock:
1885         ocfs2_inode_unlock(xb_alloc_inode, 1);
1886         brelse(xb_alloc_bh);
1887 out_mutex:
1888         mutex_unlock(&xb_alloc_inode->i_mutex);
1889         iput(xb_alloc_inode);
1890 out:
1891         brelse(blk_bh);
1892         return ret;
1893 }
1894
1895 /*
1896  * ocfs2_xattr_remove()
1897  *
1898  * Free extended attribute resources associated with this inode.
1899  */
1900 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
1901 {
1902         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1903         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1904         handle_t *handle;
1905         int ret;
1906
1907         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1908                 return 0;
1909
1910         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1911                 return 0;
1912
1913         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
1914                 ret = ocfs2_xattr_ibody_remove(inode, di_bh);
1915                 if (ret < 0) {
1916                         mlog_errno(ret);
1917                         goto out;
1918                 }
1919         }
1920
1921         if (di->i_xattr_loc) {
1922                 ret = ocfs2_xattr_free_block(inode,
1923                                              le64_to_cpu(di->i_xattr_loc));
1924                 if (ret < 0) {
1925                         mlog_errno(ret);
1926                         goto out;
1927                 }
1928         }
1929
1930         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1931                                    OCFS2_INODE_UPDATE_CREDITS);
1932         if (IS_ERR(handle)) {
1933                 ret = PTR_ERR(handle);
1934                 mlog_errno(ret);
1935                 goto out;
1936         }
1937         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
1938                                       OCFS2_JOURNAL_ACCESS_WRITE);
1939         if (ret) {
1940                 mlog_errno(ret);
1941                 goto out_commit;
1942         }
1943
1944         di->i_xattr_loc = 0;
1945
1946         spin_lock(&oi->ip_lock);
1947         oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
1948         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1949         spin_unlock(&oi->ip_lock);
1950
1951         ret = ocfs2_journal_dirty(handle, di_bh);
1952         if (ret < 0)
1953                 mlog_errno(ret);
1954 out_commit:
1955         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1956 out:
1957         return ret;
1958 }
1959
1960 static int ocfs2_xattr_has_space_inline(struct inode *inode,
1961                                         struct ocfs2_dinode *di)
1962 {
1963         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1964         unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
1965         int free;
1966
1967         if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
1968                 return 0;
1969
1970         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1971                 struct ocfs2_inline_data *idata = &di->id2.i_data;
1972                 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
1973         } else if (ocfs2_inode_is_fast_symlink(inode)) {
1974                 free = ocfs2_fast_symlink_chars(inode->i_sb) -
1975                         le64_to_cpu(di->i_size);
1976         } else {
1977                 struct ocfs2_extent_list *el = &di->id2.i_list;
1978                 free = (le16_to_cpu(el->l_count) -
1979                         le16_to_cpu(el->l_next_free_rec)) *
1980                         sizeof(struct ocfs2_extent_rec);
1981         }
1982         if (free >= xattrsize)
1983                 return 1;
1984
1985         return 0;
1986 }
1987
1988 /*
1989  * ocfs2_xattr_ibody_find()
1990  *
1991  * Find extended attribute in inode block and
1992  * fill search info into struct ocfs2_xattr_search.
1993  */
1994 static int ocfs2_xattr_ibody_find(struct inode *inode,
1995                                   int name_index,
1996                                   const char *name,
1997                                   struct ocfs2_xattr_search *xs)
1998 {
1999         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2000         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2001         int ret;
2002         int has_space = 0;
2003
2004         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2005                 return 0;
2006
2007         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2008                 down_read(&oi->ip_alloc_sem);
2009                 has_space = ocfs2_xattr_has_space_inline(inode, di);
2010                 up_read(&oi->ip_alloc_sem);
2011                 if (!has_space)
2012                         return 0;
2013         }
2014
2015         xs->xattr_bh = xs->inode_bh;
2016         xs->end = (void *)di + inode->i_sb->s_blocksize;
2017         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
2018                 xs->header = (struct ocfs2_xattr_header *)
2019                         (xs->end - le16_to_cpu(di->i_xattr_inline_size));
2020         else
2021                 xs->header = (struct ocfs2_xattr_header *)
2022                         (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
2023         xs->base = (void *)xs->header;
2024         xs->here = xs->header->xh_entries;
2025
2026         /* Find the named attribute. */
2027         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2028                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2029                 if (ret && ret != -ENODATA)
2030                         return ret;
2031                 xs->not_found = ret;
2032         }
2033
2034         return 0;
2035 }
2036
2037 /*
2038  * ocfs2_xattr_ibody_set()
2039  *
2040  * Set, replace or remove an extended attribute into inode block.
2041  *
2042  */
2043 static int ocfs2_xattr_ibody_set(struct inode *inode,
2044                                  struct ocfs2_xattr_info *xi,
2045                                  struct ocfs2_xattr_search *xs,
2046                                  struct ocfs2_xattr_set_ctxt *ctxt)
2047 {
2048         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2049         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2050         int ret;
2051
2052         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2053                 return -ENOSPC;
2054
2055         down_write(&oi->ip_alloc_sem);
2056         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2057                 if (!ocfs2_xattr_has_space_inline(inode, di)) {
2058                         ret = -ENOSPC;
2059                         goto out;
2060                 }
2061         }
2062
2063         ret = ocfs2_xattr_set_entry(inode, xi, xs, ctxt,
2064                                 (OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL));
2065 out:
2066         up_write(&oi->ip_alloc_sem);
2067
2068         return ret;
2069 }
2070
2071 /*
2072  * ocfs2_xattr_block_find()
2073  *
2074  * Find extended attribute in external block and
2075  * fill search info into struct ocfs2_xattr_search.
2076  */
2077 static int ocfs2_xattr_block_find(struct inode *inode,
2078                                   int name_index,
2079                                   const char *name,
2080                                   struct ocfs2_xattr_search *xs)
2081 {
2082         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2083         struct buffer_head *blk_bh = NULL;
2084         struct ocfs2_xattr_block *xb;
2085         int ret = 0;
2086
2087         if (!di->i_xattr_loc)
2088                 return ret;
2089
2090         ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
2091                                      &blk_bh);
2092         if (ret < 0) {
2093                 mlog_errno(ret);
2094                 return ret;
2095         }
2096
2097         xs->xattr_bh = blk_bh;
2098         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2099
2100         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2101                 xs->header = &xb->xb_attrs.xb_header;
2102                 xs->base = (void *)xs->header;
2103                 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
2104                 xs->here = xs->header->xh_entries;
2105
2106                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2107         } else
2108                 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
2109                                                    name_index,
2110                                                    name, xs);
2111
2112         if (ret && ret != -ENODATA) {
2113                 xs->xattr_bh = NULL;
2114                 goto cleanup;
2115         }
2116         xs->not_found = ret;
2117         return 0;
2118 cleanup:
2119         brelse(blk_bh);
2120
2121         return ret;
2122 }
2123
2124 static int ocfs2_create_xattr_block(handle_t *handle,
2125                                     struct inode *inode,
2126                                     struct buffer_head *inode_bh,
2127                                     struct ocfs2_alloc_context *meta_ac,
2128                                     struct buffer_head **ret_bh)
2129 {
2130         int ret;
2131         u16 suballoc_bit_start;
2132         u32 num_got;
2133         u64 first_blkno;
2134         struct ocfs2_dinode *di =  (struct ocfs2_dinode *)inode_bh->b_data;
2135         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2136         struct buffer_head *new_bh = NULL;
2137         struct ocfs2_xattr_block *xblk;
2138
2139         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), inode_bh,
2140                                       OCFS2_JOURNAL_ACCESS_CREATE);
2141         if (ret < 0) {
2142                 mlog_errno(ret);
2143                 goto end;
2144         }
2145
2146         ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1,
2147                                    &suballoc_bit_start, &num_got,
2148                                    &first_blkno);
2149         if (ret < 0) {
2150                 mlog_errno(ret);
2151                 goto end;
2152         }
2153
2154         new_bh = sb_getblk(inode->i_sb, first_blkno);
2155         ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), new_bh);
2156
2157         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode),
2158                                       new_bh,
2159                                       OCFS2_JOURNAL_ACCESS_CREATE);
2160         if (ret < 0) {
2161                 mlog_errno(ret);
2162                 goto end;
2163         }
2164
2165         /* Initialize ocfs2_xattr_block */
2166         xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
2167         memset(xblk, 0, inode->i_sb->s_blocksize);
2168         strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
2169         xblk->xb_suballoc_slot = cpu_to_le16(osb->slot_num);
2170         xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
2171         xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation);
2172         xblk->xb_blkno = cpu_to_le64(first_blkno);
2173
2174         ret = ocfs2_journal_dirty(handle, new_bh);
2175         if (ret < 0) {
2176                 mlog_errno(ret);
2177                 goto end;
2178         }
2179         di->i_xattr_loc = cpu_to_le64(first_blkno);
2180         ocfs2_journal_dirty(handle, inode_bh);
2181
2182         *ret_bh = new_bh;
2183         new_bh = NULL;
2184
2185 end:
2186         brelse(new_bh);
2187         return ret;
2188 }
2189
2190 /*
2191  * ocfs2_xattr_block_set()
2192  *
2193  * Set, replace or remove an extended attribute into external block.
2194  *
2195  */
2196 static int ocfs2_xattr_block_set(struct inode *inode,
2197                                  struct ocfs2_xattr_info *xi,
2198                                  struct ocfs2_xattr_search *xs,
2199                                  struct ocfs2_xattr_set_ctxt *ctxt)
2200 {
2201         struct buffer_head *new_bh = NULL;
2202         handle_t *handle = ctxt->handle;
2203         struct ocfs2_xattr_block *xblk = NULL;
2204         int ret;
2205
2206         if (!xs->xattr_bh) {
2207                 ret = ocfs2_create_xattr_block(handle, inode, xs->inode_bh,
2208                                                ctxt->meta_ac, &new_bh);
2209                 if (ret) {
2210                         mlog_errno(ret);
2211                         goto end;
2212                 }
2213
2214                 xs->xattr_bh = new_bh;
2215                 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2216                 xs->header = &xblk->xb_attrs.xb_header;
2217                 xs->base = (void *)xs->header;
2218                 xs->end = (void *)xblk + inode->i_sb->s_blocksize;
2219                 xs->here = xs->header->xh_entries;
2220         } else
2221                 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2222
2223         if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
2224                 /* Set extended attribute into external block */
2225                 ret = ocfs2_xattr_set_entry(inode, xi, xs, ctxt,
2226                                             OCFS2_HAS_XATTR_FL);
2227                 if (!ret || ret != -ENOSPC)
2228                         goto end;
2229
2230                 ret = ocfs2_xattr_create_index_block(inode, xs, ctxt);
2231                 if (ret)
2232                         goto end;
2233         }
2234
2235         ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs, ctxt);
2236
2237 end:
2238
2239         return ret;
2240 }
2241
2242 /* Check whether the new xattr can be inserted into the inode. */
2243 static int ocfs2_xattr_can_be_in_inode(struct inode *inode,
2244                                        struct ocfs2_xattr_info *xi,
2245                                        struct ocfs2_xattr_search *xs)
2246 {
2247         u64 value_size;
2248         struct ocfs2_xattr_entry *last;
2249         int free, i;
2250         size_t min_offs = xs->end - xs->base;
2251
2252         if (!xs->header)
2253                 return 0;
2254
2255         last = xs->header->xh_entries;
2256
2257         for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
2258                 size_t offs = le16_to_cpu(last->xe_name_offset);
2259                 if (offs < min_offs)
2260                         min_offs = offs;
2261                 last += 1;
2262         }
2263
2264         free = min_offs - ((void *)last - xs->base) - OCFS2_XATTR_HEADER_GAP;
2265         if (free < 0)
2266                 return 0;
2267
2268         BUG_ON(!xs->not_found);
2269
2270         if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
2271                 value_size = OCFS2_XATTR_ROOT_SIZE;
2272         else
2273                 value_size = OCFS2_XATTR_SIZE(xi->value_len);
2274
2275         if (free >= sizeof(struct ocfs2_xattr_entry) +
2276                    OCFS2_XATTR_SIZE(strlen(xi->name)) + value_size)
2277                 return 1;
2278
2279         return 0;
2280 }
2281
2282 static int ocfs2_calc_xattr_set_need(struct inode *inode,
2283                                      struct ocfs2_dinode *di,
2284                                      struct ocfs2_xattr_info *xi,
2285                                      struct ocfs2_xattr_search *xis,
2286                                      struct ocfs2_xattr_search *xbs,
2287                                      int *clusters_need,
2288                                      int *meta_need,
2289                                      int *credits_need)
2290 {
2291         int ret = 0, old_in_xb = 0;
2292         int clusters_add = 0, meta_add = 0, credits = 0;
2293         struct buffer_head *bh = NULL;
2294         struct ocfs2_xattr_block *xb = NULL;
2295         struct ocfs2_xattr_entry *xe = NULL;
2296         struct ocfs2_xattr_value_root *xv = NULL;
2297         char *base = NULL;
2298         int name_offset, name_len = 0;
2299         u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
2300                                                     xi->value_len);
2301         u64 value_size;
2302
2303         /*
2304          * Calculate the clusters we need to write.
2305          * No matter whether we replace an old one or add a new one,
2306          * we need this for writing.
2307          */
2308         if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
2309                 credits += new_clusters *
2310                            ocfs2_clusters_to_blocks(inode->i_sb, 1);
2311
2312         if (xis->not_found && xbs->not_found) {
2313                 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2314
2315                 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
2316                         clusters_add += new_clusters;
2317                         credits += ocfs2_calc_extend_credits(inode->i_sb,
2318                                                         &def_xv.xv.xr_list,
2319                                                         new_clusters);
2320                 }
2321
2322                 goto meta_guess;
2323         }
2324
2325         if (!xis->not_found) {
2326                 xe = xis->here;
2327                 name_offset = le16_to_cpu(xe->xe_name_offset);
2328                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
2329                 base = xis->base;
2330                 credits += OCFS2_INODE_UPDATE_CREDITS;
2331         } else {
2332                 int i, block_off = 0;
2333                 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
2334                 xe = xbs->here;
2335                 name_offset = le16_to_cpu(xe->xe_name_offset);
2336                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
2337                 i = xbs->here - xbs->header->xh_entries;
2338                 old_in_xb = 1;
2339
2340                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
2341                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
2342                                                         bucket_xh(xbs->bucket),
2343                                                         i, &block_off,
2344                                                         &name_offset);
2345                         base = bucket_block(xbs->bucket, block_off);
2346                         credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2347                 } else {
2348                         base = xbs->base;
2349                         credits += OCFS2_XATTR_BLOCK_UPDATE_CREDITS;
2350                 }
2351         }
2352
2353         /*
2354          * delete a xattr doesn't need metadata and cluster allocation.
2355          * so just calculate the credits and return.
2356          *
2357          * The credits for removing the value tree will be extended
2358          * by ocfs2_remove_extent itself.
2359          */
2360         if (!xi->value) {
2361                 if (!ocfs2_xattr_is_local(xe))
2362                         credits += ocfs2_remove_extent_credits(inode->i_sb);
2363
2364                 goto out;
2365         }
2366
2367         /* do cluster allocation guess first. */
2368         value_size = le64_to_cpu(xe->xe_value_size);
2369
2370         if (old_in_xb) {
2371                 /*
2372                  * In xattr set, we always try to set the xe in inode first,
2373                  * so if it can be inserted into inode successfully, the old
2374                  * one will be removed from the xattr block, and this xattr
2375                  * will be inserted into inode as a new xattr in inode.
2376                  */
2377                 if (ocfs2_xattr_can_be_in_inode(inode, xi, xis)) {
2378                         clusters_add += new_clusters;
2379                         credits += ocfs2_remove_extent_credits(inode->i_sb) +
2380                                     OCFS2_INODE_UPDATE_CREDITS;
2381                         if (!ocfs2_xattr_is_local(xe))
2382                                 credits += ocfs2_calc_extend_credits(
2383                                                         inode->i_sb,
2384                                                         &def_xv.xv.xr_list,
2385                                                         new_clusters);
2386                         goto out;
2387                 }
2388         }
2389
2390         if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
2391                 /* the new values will be stored outside. */
2392                 u32 old_clusters = 0;
2393
2394                 if (!ocfs2_xattr_is_local(xe)) {
2395                         old_clusters =  ocfs2_clusters_for_bytes(inode->i_sb,
2396                                                                  value_size);
2397                         xv = (struct ocfs2_xattr_value_root *)
2398                              (base + name_offset + name_len);
2399                         value_size = OCFS2_XATTR_ROOT_SIZE;
2400                 } else
2401                         xv = &def_xv.xv;
2402
2403                 if (old_clusters >= new_clusters) {
2404                         credits += ocfs2_remove_extent_credits(inode->i_sb);
2405                         goto out;
2406                 } else {
2407                         meta_add += ocfs2_extend_meta_needed(&xv->xr_list);
2408                         clusters_add += new_clusters - old_clusters;
2409                         credits += ocfs2_calc_extend_credits(inode->i_sb,
2410                                                              &xv->xr_list,
2411                                                              new_clusters -
2412                                                              old_clusters);
2413                         if (value_size >= OCFS2_XATTR_ROOT_SIZE)
2414                                 goto out;
2415                 }
2416         } else {
2417                 /*
2418                  * Now the new value will be stored inside. So if the new
2419                  * value is smaller than the size of value root or the old
2420                  * value, we don't need any allocation, otherwise we have
2421                  * to guess metadata allocation.
2422                  */
2423                 if ((ocfs2_xattr_is_local(xe) && value_size >= xi->value_len) ||
2424                     (!ocfs2_xattr_is_local(xe) &&
2425                      OCFS2_XATTR_ROOT_SIZE >= xi->value_len))
2426                         goto out;
2427         }
2428
2429 meta_guess:
2430         /* calculate metadata allocation. */
2431         if (di->i_xattr_loc) {
2432                 if (!xbs->xattr_bh) {
2433                         ret = ocfs2_read_xattr_block(inode,
2434                                                      le64_to_cpu(di->i_xattr_loc),
2435                                                      &bh);
2436                         if (ret) {
2437                                 mlog_errno(ret);
2438                                 goto out;
2439                         }
2440
2441                         xb = (struct ocfs2_xattr_block *)bh->b_data;
2442                 } else
2443                         xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
2444
2445                 /*
2446                  * If there is already an xattr tree, good, we can calculate
2447                  * like other b-trees. Otherwise we may have the chance of
2448                  * create a tree, the credit calculation is borrowed from
2449                  * ocfs2_calc_extend_credits with root_el = NULL. And the
2450                  * new tree will be cluster based, so no meta is needed.
2451                  */
2452                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
2453                         struct ocfs2_extent_list *el =
2454                                  &xb->xb_attrs.xb_root.xt_list;
2455                         meta_add += ocfs2_extend_meta_needed(el);
2456                         credits += ocfs2_calc_extend_credits(inode->i_sb,
2457                                                              el, 1);
2458                 } else
2459                         credits += OCFS2_SUBALLOC_ALLOC + 1;
2460
2461                 /*
2462                  * This cluster will be used either for new bucket or for
2463                  * new xattr block.
2464                  * If the cluster size is the same as the bucket size, one
2465                  * more is needed since we may need to extend the bucket
2466                  * also.
2467                  */
2468                 clusters_add += 1;
2469                 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2470                 if (OCFS2_XATTR_BUCKET_SIZE ==
2471                         OCFS2_SB(inode->i_sb)->s_clustersize) {
2472                         credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2473                         clusters_add += 1;
2474                 }
2475         } else {
2476                 meta_add += 1;
2477                 credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
2478         }
2479 out:
2480         if (clusters_need)
2481                 *clusters_need = clusters_add;
2482         if (meta_need)
2483                 *meta_need = meta_add;
2484         if (credits_need)
2485                 *credits_need = credits;
2486         brelse(bh);
2487         return ret;
2488 }
2489
2490 static int ocfs2_init_xattr_set_ctxt(struct inode *inode,
2491                                      struct ocfs2_dinode *di,
2492                                      struct ocfs2_xattr_info *xi,
2493                                      struct ocfs2_xattr_search *xis,
2494                                      struct ocfs2_xattr_search *xbs,
2495                                      struct ocfs2_xattr_set_ctxt *ctxt,
2496                                      int extra_meta,
2497                                      int *credits)
2498 {
2499         int clusters_add, meta_add, ret;
2500         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2501
2502         memset(ctxt, 0, sizeof(struct ocfs2_xattr_set_ctxt));
2503
2504         ocfs2_init_dealloc_ctxt(&ctxt->dealloc);
2505
2506         ret = ocfs2_calc_xattr_set_need(inode, di, xi, xis, xbs,
2507                                         &clusters_add, &meta_add, credits);
2508         if (ret) {
2509                 mlog_errno(ret);
2510                 return ret;
2511         }
2512
2513         meta_add += extra_meta;
2514         mlog(0, "Set xattr %s, reserve meta blocks = %d, clusters = %d, "
2515              "credits = %d\n", xi->name, meta_add, clusters_add, *credits);
2516
2517         if (meta_add) {
2518                 ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add,
2519                                                         &ctxt->meta_ac);
2520                 if (ret) {
2521                         mlog_errno(ret);
2522                         goto out;
2523                 }
2524         }
2525
2526         if (clusters_add) {
2527                 ret = ocfs2_reserve_clusters(osb, clusters_add, &ctxt->data_ac);
2528                 if (ret)
2529                         mlog_errno(ret);
2530         }
2531 out:
2532         if (ret) {
2533                 if (ctxt->meta_ac) {
2534                         ocfs2_free_alloc_context(ctxt->meta_ac);
2535                         ctxt->meta_ac = NULL;
2536                 }
2537
2538                 /*
2539                  * We cannot have an error and a non null ctxt->data_ac.
2540                  */
2541         }
2542
2543         return ret;
2544 }
2545
2546 static int __ocfs2_xattr_set_handle(struct inode *inode,
2547                                     struct ocfs2_dinode *di,
2548                                     struct ocfs2_xattr_info *xi,
2549                                     struct ocfs2_xattr_search *xis,
2550                                     struct ocfs2_xattr_search *xbs,
2551                                     struct ocfs2_xattr_set_ctxt *ctxt)
2552 {
2553         int ret = 0, credits, old_found;
2554
2555         if (!xi->value) {
2556                 /* Remove existing extended attribute */
2557                 if (!xis->not_found)
2558                         ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
2559                 else if (!xbs->not_found)
2560                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
2561         } else {
2562                 /* We always try to set extended attribute into inode first*/
2563                 ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
2564                 if (!ret && !xbs->not_found) {
2565                         /*
2566                          * If succeed and that extended attribute existing in
2567                          * external block, then we will remove it.
2568                          */
2569                         xi->value = NULL;
2570                         xi->value_len = 0;
2571
2572                         old_found = xis->not_found;
2573                         xis->not_found = -ENODATA;
2574                         ret = ocfs2_calc_xattr_set_need(inode,
2575                                                         di,
2576                                                         xi,
2577                                                         xis,
2578                                                         xbs,
2579                                                         NULL,
2580                                                         NULL,
2581                                                         &credits);
2582                         xis->not_found = old_found;
2583                         if (ret) {
2584                                 mlog_errno(ret);
2585                                 goto out;
2586                         }
2587
2588                         ret = ocfs2_extend_trans(ctxt->handle, credits +
2589                                         ctxt->handle->h_buffer_credits);
2590                         if (ret) {
2591                                 mlog_errno(ret);
2592                                 goto out;
2593                         }
2594                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
2595                 } else if (ret == -ENOSPC) {
2596                         if (di->i_xattr_loc && !xbs->xattr_bh) {
2597                                 ret = ocfs2_xattr_block_find(inode,
2598                                                              xi->name_index,
2599                                                              xi->name, xbs);
2600                                 if (ret)
2601                                         goto out;
2602
2603                                 old_found = xis->not_found;
2604                                 xis->not_found = -ENODATA;
2605                                 ret = ocfs2_calc_xattr_set_need(inode,
2606                                                                 di,
2607                                                                 xi,
2608                                                                 xis,
2609                                                                 xbs,
2610                                                                 NULL,
2611                                                                 NULL,
2612                                                                 &credits);
2613                                 xis->not_found = old_found;
2614                                 if (ret) {
2615                                         mlog_errno(ret);
2616                                         goto out;
2617                                 }
2618
2619                                 ret = ocfs2_extend_trans(ctxt->handle, credits +
2620                                         ctxt->handle->h_buffer_credits);
2621                                 if (ret) {
2622                                         mlog_errno(ret);
2623                                         goto out;
2624                                 }
2625                         }
2626                         /*
2627                          * If no space in inode, we will set extended attribute
2628                          * into external block.
2629                          */
2630                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
2631                         if (ret)
2632                                 goto out;
2633                         if (!xis->not_found) {
2634                                 /*
2635                                  * If succeed and that extended attribute
2636                                  * existing in inode, we will remove it.
2637                                  */
2638                                 xi->value = NULL;
2639                                 xi->value_len = 0;
2640                                 xbs->not_found = -ENODATA;
2641                                 ret = ocfs2_calc_xattr_set_need(inode,
2642                                                                 di,
2643                                                                 xi,
2644                                                                 xis,
2645                                                                 xbs,
2646                                                                 NULL,
2647                                                                 NULL,
2648                                                                 &credits);
2649                                 if (ret) {
2650                                         mlog_errno(ret);
2651                                         goto out;
2652                                 }
2653
2654                                 ret = ocfs2_extend_trans(ctxt->handle, credits +
2655                                                 ctxt->handle->h_buffer_credits);
2656                                 if (ret) {
2657                                         mlog_errno(ret);
2658                                         goto out;
2659                                 }
2660                                 ret = ocfs2_xattr_ibody_set(inode, xi,
2661                                                             xis, ctxt);
2662                         }
2663                 }
2664         }
2665
2666         if (!ret) {
2667                 /* Update inode ctime. */
2668                 ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
2669                                               xis->inode_bh,
2670                                               OCFS2_JOURNAL_ACCESS_WRITE);
2671                 if (ret) {
2672                         mlog_errno(ret);
2673                         goto out;
2674                 }
2675
2676                 inode->i_ctime = CURRENT_TIME;
2677                 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
2678                 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
2679                 ocfs2_journal_dirty(ctxt->handle, xis->inode_bh);
2680         }
2681 out:
2682         return ret;
2683 }
2684
2685 /*
2686  * This function only called duing creating inode
2687  * for init security/acl xattrs of the new inode.
2688  * All transanction credits have been reserved in mknod.
2689  */
2690 int ocfs2_xattr_set_handle(handle_t *handle,
2691                            struct inode *inode,
2692                            struct buffer_head *di_bh,
2693                            int name_index,
2694                            const char *name,
2695                            const void *value,
2696                            size_t value_len,
2697                            int flags,
2698                            struct ocfs2_alloc_context *meta_ac,
2699                            struct ocfs2_alloc_context *data_ac)
2700 {
2701         struct ocfs2_dinode *di;
2702         int ret;
2703
2704         struct ocfs2_xattr_info xi = {
2705                 .name_index = name_index,
2706                 .name = name,
2707                 .value = value,
2708                 .value_len = value_len,
2709         };
2710
2711         struct ocfs2_xattr_search xis = {
2712                 .not_found = -ENODATA,
2713         };
2714
2715         struct ocfs2_xattr_search xbs = {
2716                 .not_found = -ENODATA,
2717         };
2718
2719         struct ocfs2_xattr_set_ctxt ctxt = {
2720                 .handle = handle,
2721                 .meta_ac = meta_ac,
2722                 .data_ac = data_ac,
2723         };
2724
2725         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2726                 return -EOPNOTSUPP;
2727
2728         /*
2729          * In extreme situation, may need xattr bucket when
2730          * block size is too small. And we have already reserved
2731          * the credits for bucket in mknod.
2732          */
2733         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) {
2734                 xbs.bucket = ocfs2_xattr_bucket_new(inode);
2735                 if (!xbs.bucket) {
2736                         mlog_errno(-ENOMEM);
2737                         return -ENOMEM;
2738                 }
2739         }
2740
2741         xis.inode_bh = xbs.inode_bh = di_bh;
2742         di = (struct ocfs2_dinode *)di_bh->b_data;
2743
2744         down_write(&OCFS2_I(inode)->ip_xattr_sem);
2745
2746         ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
2747         if (ret)
2748                 goto cleanup;
2749         if (xis.not_found) {
2750                 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
2751                 if (ret)
2752                         goto cleanup;
2753         }
2754
2755         ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
2756
2757 cleanup:
2758         up_write(&OCFS2_I(inode)->ip_xattr_sem);
2759         brelse(xbs.xattr_bh);
2760         ocfs2_xattr_bucket_free(xbs.bucket);
2761
2762         return ret;
2763 }
2764
2765 /*
2766  * ocfs2_xattr_set()
2767  *
2768  * Set, replace or remove an extended attribute for this inode.
2769  * value is NULL to remove an existing extended attribute, else either
2770  * create or replace an extended attribute.
2771  */
2772 int ocfs2_xattr_set(struct inode *inode,
2773                     int name_index,
2774                     const char *name,
2775                     const void *value,
2776                     size_t value_len,
2777                     int flags)
2778 {
2779         struct buffer_head *di_bh = NULL;
2780         struct ocfs2_dinode *di;
2781         int ret, credits, ref_meta = 0, ref_credits = 0;
2782         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2783         struct inode *tl_inode = osb->osb_tl_inode;
2784         struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
2785         struct ocfs2_refcount_tree *ref_tree = NULL;
2786
2787         struct ocfs2_xattr_info xi = {
2788                 .name_index = name_index,
2789                 .name = name,
2790                 .value = value,
2791                 .value_len = value_len,
2792         };
2793
2794         struct ocfs2_xattr_search xis = {
2795                 .not_found = -ENODATA,
2796         };
2797
2798         struct ocfs2_xattr_search xbs = {
2799                 .not_found = -ENODATA,
2800         };
2801
2802         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2803                 return -EOPNOTSUPP;
2804
2805         /*
2806          * Only xbs will be used on indexed trees.  xis doesn't need a
2807          * bucket.
2808          */
2809         xbs.bucket = ocfs2_xattr_bucket_new(inode);
2810         if (!xbs.bucket) {
2811                 mlog_errno(-ENOMEM);
2812                 return -ENOMEM;
2813         }
2814
2815         ret = ocfs2_inode_lock(inode, &di_bh, 1);
2816         if (ret < 0) {
2817                 mlog_errno(ret);
2818                 goto cleanup_nolock;
2819         }
2820         xis.inode_bh = xbs.inode_bh = di_bh;
2821         di = (struct ocfs2_dinode *)di_bh->b_data;
2822
2823         down_write(&OCFS2_I(inode)->ip_xattr_sem);
2824         /*
2825          * Scan inode and external block to find the same name
2826          * extended attribute and collect search infomation.
2827          */
2828         ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
2829         if (ret)
2830                 goto cleanup;
2831         if (xis.not_found) {
2832                 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
2833                 if (ret)
2834                         goto cleanup;
2835         }
2836
2837         if (xis.not_found && xbs.not_found) {
2838                 ret = -ENODATA;
2839                 if (flags & XATTR_REPLACE)
2840                         goto cleanup;
2841                 ret = 0;
2842                 if (!value)
2843                         goto cleanup;
2844         } else {
2845                 ret = -EEXIST;
2846                 if (flags & XATTR_CREATE)
2847                         goto cleanup;
2848         }
2849
2850         /* Check whether the value is refcounted and do some prepartion. */
2851         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL &&
2852             (!xis.not_found || !xbs.not_found)) {
2853                 ret = ocfs2_prepare_refcount_xattr(inode, di, &xi,
2854                                                    &xis, &xbs, &ref_tree,
2855                                                    &ref_meta, &ref_credits);
2856                 if (ret) {
2857                         mlog_errno(ret);
2858                         goto cleanup;
2859                 }
2860         }
2861
2862         mutex_lock(&tl_inode->i_mutex);
2863
2864         if (ocfs2_truncate_log_needs_flush(osb)) {
2865                 ret = __ocfs2_flush_truncate_log(osb);
2866                 if (ret < 0) {
2867                         mutex_unlock(&tl_inode->i_mutex);
2868                         mlog_errno(ret);
2869                         goto cleanup;
2870                 }
2871         }
2872         mutex_unlock(&tl_inode->i_mutex);
2873
2874         ret = ocfs2_init_xattr_set_ctxt(inode, di, &xi, &xis,
2875                                         &xbs, &ctxt, ref_meta, &credits);
2876         if (ret) {
2877                 mlog_errno(ret);
2878                 goto cleanup;
2879         }
2880
2881         /* we need to update inode's ctime field, so add credit for it. */
2882         credits += OCFS2_INODE_UPDATE_CREDITS;
2883         ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
2884         if (IS_ERR(ctxt.handle)) {
2885                 ret = PTR_ERR(ctxt.handle);
2886                 mlog_errno(ret);
2887                 goto cleanup;
2888         }
2889
2890         ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
2891
2892         ocfs2_commit_trans(osb, ctxt.handle);
2893
2894         if (ctxt.data_ac)
2895                 ocfs2_free_alloc_context(ctxt.data_ac);
2896         if (ctxt.meta_ac)
2897                 ocfs2_free_alloc_context(ctxt.meta_ac);
2898         if (ocfs2_dealloc_has_cluster(&ctxt.dealloc))
2899                 ocfs2_schedule_truncate_log_flush(osb, 1);
2900         ocfs2_run_deallocs(osb, &ctxt.dealloc);
2901 cleanup:
2902         if (ref_tree)
2903                 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
2904         up_write(&OCFS2_I(inode)->ip_xattr_sem);
2905         ocfs2_inode_unlock(inode, 1);
2906 cleanup_nolock:
2907         brelse(di_bh);
2908         brelse(xbs.xattr_bh);
2909         ocfs2_xattr_bucket_free(xbs.bucket);
2910
2911         return ret;
2912 }
2913
2914 /*
2915  * Find the xattr extent rec which may contains name_hash.
2916  * e_cpos will be the first name hash of the xattr rec.
2917  * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
2918  */
2919 static int ocfs2_xattr_get_rec(struct inode *inode,
2920                                u32 name_hash,
2921                                u64 *p_blkno,
2922                                u32 *e_cpos,
2923                                u32 *num_clusters,
2924                                struct ocfs2_extent_list *el)
2925 {
2926         int ret = 0, i;
2927         struct buffer_head *eb_bh = NULL;
2928         struct ocfs2_extent_block *eb;
2929         struct ocfs2_extent_rec *rec = NULL;
2930         u64 e_blkno = 0;
2931
2932         if (el->l_tree_depth) {
2933                 ret = ocfs2_find_leaf(INODE_CACHE(inode), el, name_hash,
2934                                       &eb_bh);
2935                 if (ret) {
2936                         mlog_errno(ret);
2937                         goto out;
2938                 }
2939
2940                 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2941                 el = &eb->h_list;
2942
2943                 if (el->l_tree_depth) {
2944                         ocfs2_error(inode->i_sb,
2945                                     "Inode %lu has non zero tree depth in "
2946                                     "xattr tree block %llu\n", inode->i_ino,
2947                                     (unsigned long long)eb_bh->b_blocknr);
2948                         ret = -EROFS;
2949                         goto out;
2950                 }
2951         }
2952
2953         for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
2954                 rec = &el->l_recs[i];
2955
2956                 if (le32_to_cpu(rec->e_cpos) <= name_hash) {
2957                         e_blkno = le64_to_cpu(rec->e_blkno);
2958                         break;
2959                 }
2960         }
2961
2962         if (!e_blkno) {
2963                 ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
2964                             "record (%u, %u, 0) in xattr", inode->i_ino,
2965                             le32_to_cpu(rec->e_cpos),
2966                             ocfs2_rec_clusters(el, rec));
2967                 ret = -EROFS;
2968                 goto out;
2969         }
2970
2971         *p_blkno = le64_to_cpu(rec->e_blkno);
2972         *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
2973         if (e_cpos)
2974                 *e_cpos = le32_to_cpu(rec->e_cpos);
2975 out:
2976         brelse(eb_bh);
2977         return ret;
2978 }
2979
2980 typedef int (xattr_bucket_func)(struct inode *inode,
2981                                 struct ocfs2_xattr_bucket *bucket,
2982                                 void *para);
2983
2984 static int ocfs2_find_xe_in_bucket(struct inode *inode,
2985                                    struct ocfs2_xattr_bucket *bucket,
2986                                    int name_index,
2987                                    const char *name,
2988                                    u32 name_hash,
2989                                    u16 *xe_index,
2990                                    int *found)
2991 {
2992         int i, ret = 0, cmp = 1, block_off, new_offset;
2993         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
2994         size_t name_len = strlen(name);
2995         struct ocfs2_xattr_entry *xe = NULL;
2996         char *xe_name;
2997
2998         /*
2999          * We don't use binary search in the bucket because there
3000          * may be multiple entries with the same name hash.
3001          */
3002         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3003                 xe = &xh->xh_entries[i];
3004
3005                 if (name_hash > le32_to_cpu(xe->xe_name_hash))
3006                         continue;
3007                 else if (name_hash < le32_to_cpu(xe->xe_name_hash))
3008                         break;
3009
3010                 cmp = name_index - ocfs2_xattr_get_type(xe);
3011                 if (!cmp)
3012                         cmp = name_len - xe->xe_name_len;
3013                 if (cmp)
3014                         continue;
3015
3016                 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3017                                                         xh,
3018                                                         i,
3019                                                         &block_off,
3020                                                         &new_offset);
3021                 if (ret) {
3022                         mlog_errno(ret);
3023                         break;
3024                 }
3025
3026
3027                 xe_name = bucket_block(bucket, block_off) + new_offset;
3028                 if (!memcmp(name, xe_name, name_len)) {
3029                         *xe_index = i;
3030                         *found = 1;
3031                         ret = 0;
3032                         break;
3033                 }
3034         }
3035
3036         return ret;
3037 }
3038
3039 /*
3040  * Find the specified xattr entry in a series of buckets.
3041  * This series start from p_blkno and last for num_clusters.
3042  * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
3043  * the num of the valid buckets.
3044  *
3045  * Return the buffer_head this xattr should reside in. And if the xattr's
3046  * hash is in the gap of 2 buckets, return the lower bucket.
3047  */
3048 static int ocfs2_xattr_bucket_find(struct inode *inode,
3049                                    int name_index,
3050                                    const char *name,
3051                                    u32 name_hash,
3052                                    u64 p_blkno,
3053                                    u32 first_hash,
3054                                    u32 num_clusters,
3055                                    struct ocfs2_xattr_search *xs)
3056 {
3057         int ret, found = 0;
3058         struct ocfs2_xattr_header *xh = NULL;
3059         struct ocfs2_xattr_entry *xe = NULL;
3060         u16 index = 0;
3061         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3062         int low_bucket = 0, bucket, high_bucket;
3063         struct ocfs2_xattr_bucket *search;
3064         u32 last_hash;
3065         u64 blkno, lower_blkno = 0;
3066
3067         search = ocfs2_xattr_bucket_new(inode);
3068         if (!search) {
3069                 ret = -ENOMEM;
3070                 mlog_errno(ret);
3071                 goto out;
3072         }
3073
3074         ret = ocfs2_read_xattr_bucket(search, p_blkno);
3075         if (ret) {
3076                 mlog_errno(ret);
3077                 goto out;
3078         }
3079
3080         xh = bucket_xh(search);
3081         high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
3082         while (low_bucket <= high_bucket) {
3083                 ocfs2_xattr_bucket_relse(search);
3084
3085                 bucket = (low_bucket + high_bucket) / 2;
3086                 blkno = p_blkno + bucket * blk_per_bucket;
3087                 ret = ocfs2_read_xattr_bucket(search, blkno);
3088                 if (ret) {
3089                         mlog_errno(ret);
3090                         goto out;
3091                 }
3092
3093                 xh = bucket_xh(search);
3094                 xe = &xh->xh_entries[0];
3095                 if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
3096                         high_bucket = bucket - 1;
3097                         continue;
3098                 }
3099
3100                 /*
3101                  * Check whether the hash of the last entry in our
3102                  * bucket is larger than the search one. for an empty
3103                  * bucket, the last one is also the first one.
3104                  */
3105                 if (xh->xh_count)
3106                         xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
3107
3108                 last_hash = le32_to_cpu(xe->xe_name_hash);
3109
3110                 /* record lower_blkno which may be the insert place. */
3111                 lower_blkno = blkno;
3112
3113                 if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
3114                         low_bucket = bucket + 1;
3115                         continue;
3116                 }
3117
3118                 /* the searched xattr should reside in this bucket if exists. */
3119                 ret = ocfs2_find_xe_in_bucket(inode, search,
3120                                               name_index, name, name_hash,
3121                                               &index, &found);
3122                 if (ret) {
3123                         mlog_errno(ret);
3124                         goto out;
3125                 }
3126                 break;
3127         }
3128
3129         /*
3130          * Record the bucket we have found.
3131          * When the xattr's hash value is in the gap of 2 buckets, we will
3132          * always set it to the previous bucket.
3133          */
3134         if (!lower_blkno)
3135                 lower_blkno = p_blkno;
3136
3137         /* This should be in cache - we just read it during the search */
3138         ret = ocfs2_read_xattr_bucket(xs->bucket, lower_blkno);
3139         if (ret) {
3140                 mlog_errno(ret);
3141                 goto out;
3142         }
3143
3144         xs->header = bucket_xh(xs->bucket);
3145         xs->base = bucket_block(xs->bucket, 0);
3146         xs->end = xs->base + inode->i_sb->s_blocksize;
3147
3148         if (found) {
3149                 xs->here = &xs->header->xh_entries[index];
3150                 mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name,
3151                      (unsigned long long)bucket_blkno(xs->bucket), index);
3152         } else
3153                 ret = -ENODATA;
3154
3155 out:
3156         ocfs2_xattr_bucket_free(search);
3157         return ret;
3158 }
3159
3160 static int ocfs2_xattr_index_block_find(struct inode *inode,
3161                                         struct buffer_head *root_bh,
3162                                         int name_index,
3163                                         const char *name,
3164                                         struct ocfs2_xattr_search *xs)
3165 {
3166         int ret;
3167         struct ocfs2_xattr_block *xb =
3168                         (struct ocfs2_xattr_block *)root_bh->b_data;
3169         struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3170         struct ocfs2_extent_list *el = &xb_root->xt_list;
3171         u64 p_blkno = 0;
3172         u32 first_hash, num_clusters = 0;
3173         u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
3174
3175         if (le16_to_cpu(el->l_next_free_rec) == 0)
3176                 return -ENODATA;
3177
3178         mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n",
3179              name, name_hash, name_index);
3180
3181         ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
3182                                   &num_clusters, el);
3183         if (ret) {
3184                 mlog_errno(ret);
3185                 goto out;
3186         }
3187
3188         BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
3189
3190         mlog(0, "find xattr extent rec %u clusters from %llu, the first hash "
3191              "in the rec is %u\n", num_clusters, (unsigned long long)p_blkno,
3192              first_hash);
3193
3194         ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
3195                                       p_blkno, first_hash, num_clusters, xs);
3196
3197 out:
3198         return ret;
3199 }
3200
3201 static int ocfs2_iterate_xattr_buckets(struct inode *inode,
3202                                        u64 blkno,
3203                                        u32 clusters,
3204                                        xattr_bucket_func *func,
3205                                        void *para)
3206 {
3207         int i, ret = 0;
3208         u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
3209         u32 num_buckets = clusters * bpc;
3210         struct ocfs2_xattr_bucket *bucket;
3211
3212         bucket = ocfs2_xattr_bucket_new(inode);
3213         if (!bucket) {
3214                 mlog_errno(-ENOMEM);
3215                 return -ENOMEM;
3216         }
3217
3218         mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n",
3219              clusters, (unsigned long long)blkno);
3220
3221         for (i = 0; i < num_buckets; i++, blkno += bucket->bu_blocks) {
3222                 ret = ocfs2_read_xattr_bucket(bucket, blkno);
3223                 if (ret) {
3224                         mlog_errno(ret);
3225                         break;
3226                 }
3227
3228                 /*
3229                  * The real bucket num in this series of blocks is stored
3230                  * in the 1st bucket.
3231                  */
3232                 if (i == 0)
3233                         num_buckets = le16_to_cpu(bucket_xh(bucket)->xh_num_buckets);
3234
3235                 mlog(0, "iterating xattr bucket %llu, first hash %u\n",
3236                      (unsigned long long)blkno,
3237                      le32_to_cpu(bucket_xh(bucket)->xh_entries[0].xe_name_hash));
3238                 if (func) {
3239                         ret = func(inode, bucket, para);
3240                         if (ret && ret != -ERANGE)
3241                                 mlog_errno(ret);
3242                         /* Fall through to bucket_relse() */
3243                 }
3244
3245                 ocfs2_xattr_bucket_relse(bucket);
3246                 if (ret)
3247                         break;
3248         }
3249
3250         ocfs2_xattr_bucket_free(bucket);
3251         return ret;
3252 }
3253
3254 struct ocfs2_xattr_tree_list {
3255         char *buffer;
3256         size_t buffer_size;
3257         size_t result;
3258 };
3259
3260 static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
3261                                              struct ocfs2_xattr_header *xh,
3262                                              int index,
3263                                              int *block_off,
3264                                              int *new_offset)
3265 {
3266         u16 name_offset;
3267
3268         if (index < 0 || index >= le16_to_cpu(xh->xh_count))
3269                 return -EINVAL;
3270
3271         name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
3272
3273         *block_off = name_offset >> sb->s_blocksize_bits;
3274         *new_offset = name_offset % sb->s_blocksize;
3275
3276         return 0;
3277 }
3278
3279 static int ocfs2_list_xattr_bucket(struct inode *inode,
3280                                    struct ocfs2_xattr_bucket *bucket,
3281                                    void *para)
3282 {
3283         int ret = 0, type;
3284         struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
3285         int i, block_off, new_offset;
3286         const char *prefix, *name;
3287
3288         for (i = 0 ; i < le16_to_cpu(bucket_xh(bucket)->xh_count); i++) {
3289                 struct ocfs2_xattr_entry *entry = &bucket_xh(bucket)->xh_entries[i];
3290                 type = ocfs2_xattr_get_type(entry);
3291                 prefix = ocfs2_xattr_prefix(type);
3292
3293                 if (prefix) {
3294                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3295                                                                 bucket_xh(bucket),
3296                                                                 i,
3297                                                                 &block_off,
3298                                                                 &new_offset);
3299                         if (ret)
3300                                 break;
3301
3302                         name = (const char *)bucket_block(bucket, block_off) +
3303                                 new_offset;
3304                         ret = ocfs2_xattr_list_entry(xl->buffer,
3305                                                      xl->buffer_size,
3306                                                      &xl->result,
3307                                                      prefix, name,
3308                                                      entry->xe_name_len);
3309                         if (ret)
3310                                 break;
3311                 }
3312         }
3313
3314         return ret;
3315 }
3316
3317 static int ocfs2_iterate_xattr_index_block(struct inode *inode,
3318                                            struct buffer_head *blk_bh,
3319                                            xattr_tree_rec_func *rec_func,
3320                                            void *para)
3321 {
3322         struct ocfs2_xattr_block *xb =
3323                         (struct ocfs2_xattr_block *)blk_bh->b_data;
3324         struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
3325         int ret = 0;
3326         u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
3327         u64 p_blkno = 0;
3328
3329         if (!el->l_next_free_rec || !rec_func)
3330                 return 0;
3331
3332         while (name_hash > 0) {
3333                 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
3334                                           &e_cpos, &num_clusters, el);
3335                 if (ret) {
3336                         mlog_errno(ret);
3337                         break;
3338                 }
3339
3340                 ret = rec_func(inode, blk_bh, p_blkno, e_cpos,
3341                                num_clusters, para);
3342                 if (ret) {
3343                         if (ret != -ERANGE)
3344                                 mlog_errno(ret);
3345                         break;
3346                 }
3347
3348                 if (e_cpos == 0)
3349                         break;
3350
3351                 name_hash = e_cpos - 1;
3352         }
3353
3354         return ret;
3355
3356 }
3357
3358 static int ocfs2_list_xattr_tree_rec(struct inode *inode,
3359                                      struct buffer_head *root_bh,
3360                                      u64 blkno, u32 cpos, u32 len, void *para)
3361 {
3362         return ocfs2_iterate_xattr_buckets(inode, blkno, len,
3363                                            ocfs2_list_xattr_bucket, para);
3364 }
3365
3366 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
3367                                              struct buffer_head *blk_bh,
3368                                              char *buffer,
3369                                              size_t buffer_size)
3370 {
3371         int ret;
3372         struct ocfs2_xattr_tree_list xl = {
3373                 .buffer = buffer,
3374                 .buffer_size = buffer_size,
3375                 .result = 0,
3376         };
3377
3378         ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
3379                                               ocfs2_list_xattr_tree_rec, &xl);
3380         if (ret) {
3381                 mlog_errno(ret);
3382                 goto out;
3383         }
3384
3385         ret = xl.result;
3386 out:
3387         return ret;
3388 }
3389
3390 static int cmp_xe(const void *a, const void *b)
3391 {
3392         const struct ocfs2_xattr_entry *l = a, *r = b;
3393         u32 l_hash = le32_to_cpu(l->xe_name_hash);
3394         u32 r_hash = le32_to_cpu(r->xe_name_hash);
3395
3396         if (l_hash > r_hash)
3397                 return 1;
3398         if (l_hash < r_hash)
3399                 return -1;
3400         return 0;
3401 }
3402
3403 static void swap_xe(void *a, void *b, int size)
3404 {
3405         struct ocfs2_xattr_entry *l = a, *r = b, tmp;
3406
3407         tmp = *l;
3408         memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
3409         memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
3410 }
3411
3412 /*
3413  * When the ocfs2_xattr_block is filled up, new bucket will be created
3414  * and all the xattr entries will be moved to the new bucket.
3415  * The header goes at the start of the bucket, and the names+values are
3416  * filled from the end.  This is why *target starts as the last buffer.
3417  * Note: we need to sort the entries since they are not saved in order
3418  * in the ocfs2_xattr_block.
3419  */
3420 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
3421                                            struct buffer_head *xb_bh,
3422                                            struct ocfs2_xattr_bucket *bucket)
3423 {
3424         int i, blocksize = inode->i_sb->s_blocksize;
3425         int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3426         u16 offset, size, off_change;
3427         struct ocfs2_xattr_entry *xe;
3428         struct ocfs2_xattr_block *xb =
3429                                 (struct ocfs2_xattr_block *)xb_bh->b_data;
3430         struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
3431         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
3432         u16 count = le16_to_cpu(xb_xh->xh_count);
3433         char *src = xb_bh->b_data;
3434         char *target = bucket_block(bucket, blks - 1);
3435
3436         mlog(0, "cp xattr from block %llu to bucket %llu\n",
3437              (unsigned long long)xb_bh->b_blocknr,
3438              (unsigned long long)bucket_blkno(bucket));
3439
3440         for (i = 0; i < blks; i++)
3441                 memset(bucket_block(bucket, i), 0, blocksize);
3442
3443         /*
3444          * Since the xe_name_offset is based on ocfs2_xattr_header,
3445          * there is a offset change corresponding to the change of
3446          * ocfs2_xattr_header's position.
3447          */
3448         off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
3449         xe = &xb_xh->xh_entries[count - 1];
3450         offset = le16_to_cpu(xe->xe_name_offset) + off_change;
3451         size = blocksize - offset;
3452
3453         /* copy all the names and values. */
3454         memcpy(target + offset, src + offset, size);
3455
3456         /* Init new header now. */
3457         xh->xh_count = xb_xh->xh_count;
3458         xh->xh_num_buckets = cpu_to_le16(1);
3459         xh->xh_name_value_len = cpu_to_le16(size);
3460         xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
3461
3462         /* copy all the entries. */
3463         target = bucket_block(bucket, 0);
3464         offset = offsetof(struct ocfs2_xattr_header, xh_entries);
3465         size = count * sizeof(struct ocfs2_xattr_entry);
3466         memcpy(target + offset, (char *)xb_xh + offset, size);
3467
3468         /* Change the xe offset for all the xe because of the move. */
3469         off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
3470                  offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
3471         for (i = 0; i < count; i++)
3472                 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
3473
3474         mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n",
3475              offset, size, off_change);
3476
3477         sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
3478              cmp_xe, swap_xe);
3479 }
3480
3481 /*
3482  * After we move xattr from block to index btree, we have to
3483  * update ocfs2_xattr_search to the new xe and base.
3484  *
3485  * When the entry is in xattr block, xattr_bh indicates the storage place.
3486  * While if the entry is in index b-tree, "bucket" indicates the
3487  * real place of the xattr.
3488  */
3489 static void ocfs2_xattr_update_xattr_search(struct inode *inode,
3490                                             struct ocfs2_xattr_search *xs,
3491                                             struct buffer_head *old_bh)
3492 {
3493         char *buf = old_bh->b_data;
3494         struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
3495         struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
3496         int i;
3497
3498         xs->header = bucket_xh(xs->bucket);
3499         xs->base = bucket_block(xs->bucket, 0);
3500         xs->end = xs->base + inode->i_sb->s_blocksize;
3501
3502         if (xs->not_found)
3503                 return;
3504
3505         i = xs->here - old_xh->xh_entries;
3506         xs->here = &xs->header->xh_entries[i];
3507 }
3508
3509 static int ocfs2_xattr_create_index_block(struct inode *inode,
3510                                           struct ocfs2_xattr_search *xs,
3511                                           struct ocfs2_xattr_set_ctxt *ctxt)
3512 {
3513         int ret;
3514         u32 bit_off, len;
3515         u64 blkno;
3516         handle_t *handle = ctxt->handle;
3517         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3518         struct ocfs2_inode_info *oi = OCFS2_I(inode);
3519         struct buffer_head *xb_bh = xs->xattr_bh;
3520         struct ocfs2_xattr_block *xb =
3521                         (struct ocfs2_xattr_block *)xb_bh->b_data;
3522         struct ocfs2_xattr_tree_root *xr;
3523         u16 xb_flags = le16_to_cpu(xb->xb_flags);
3524
3525         mlog(0, "create xattr index block for %llu\n",
3526              (unsigned long long)xb_bh->b_blocknr);
3527
3528         BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
3529         BUG_ON(!xs->bucket);
3530
3531         /*
3532          * XXX:
3533          * We can use this lock for now, and maybe move to a dedicated mutex
3534          * if performance becomes a problem later.
3535          */
3536         down_write(&oi->ip_alloc_sem);
3537
3538         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), xb_bh,
3539                                       OCFS2_JOURNAL_ACCESS_WRITE);
3540         if (ret) {
3541                 mlog_errno(ret);
3542                 goto out;
3543         }
3544
3545         ret = __ocfs2_claim_clusters(osb, handle, ctxt->data_ac,
3546                                      1, 1, &bit_off, &len);
3547         if (ret) {
3548                 mlog_errno(ret);
3549                 goto out;
3550         }
3551
3552         /*
3553          * The bucket may spread in many blocks, and
3554          * we will only touch the 1st block and the last block
3555          * in the whole bucket(one for entry and one for data).
3556          */
3557         blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
3558
3559         mlog(0, "allocate 1 cluster from %llu to xattr block\n",
3560              (unsigned long long)blkno);
3561
3562         ret = ocfs2_init_xattr_bucket(xs->bucket, blkno);
3563         if (ret) {
3564                 mlog_errno(ret);
3565                 goto out;
3566         }
3567
3568         ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
3569                                                 OCFS2_JOURNAL_ACCESS_CREATE);
3570         if (ret) {
3571                 mlog_errno(ret);
3572                 goto out;
3573         }
3574
3575         ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xs->bucket);
3576         ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
3577
3578         ocfs2_xattr_update_xattr_search(inode, xs, xb_bh);
3579
3580         /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
3581         memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
3582                offsetof(struct ocfs2_xattr_block, xb_attrs));
3583
3584         xr = &xb->xb_attrs.xb_root;
3585         xr->xt_clusters = cpu_to_le32(1);
3586         xr->xt_last_eb_blk = 0;
3587         xr->xt_list.l_tree_depth = 0;
3588         xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
3589         xr->xt_list.l_next_free_rec = cpu_to_le16(1);
3590
3591         xr->xt_list.l_recs[0].e_cpos = 0;
3592         xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
3593         xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
3594
3595         xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
3596
3597         ocfs2_journal_dirty(handle, xb_bh);
3598
3599 out:
3600         up_write(&oi->ip_alloc_sem);
3601
3602         return ret;
3603 }
3604
3605 static int cmp_xe_offset(const void *a, const void *b)
3606 {
3607         const struct ocfs2_xattr_entry *l = a, *r = b;
3608         u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
3609         u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
3610
3611         if (l_name_offset < r_name_offset)
3612                 return 1;
3613         if (l_name_offset > r_name_offset)
3614                 return -1;
3615         return 0;
3616 }
3617
3618 /*
3619  * defrag a xattr bucket if we find that the bucket has some
3620  * holes beteen name/value pairs.
3621  * We will move all the name/value pairs to the end of the bucket
3622  * so that we can spare some space for insertion.
3623  */
3624 static int ocfs2_defrag_xattr_bucket(struct inode *inode,
3625                                      handle_t *handle,
3626                                      struct ocfs2_xattr_bucket *bucket)
3627 {
3628         int ret, i;
3629         size_t end, offset, len, value_len;
3630         struct ocfs2_xattr_header *xh;
3631         char *entries, *buf, *bucket_buf = NULL;
3632         u64 blkno = bucket_blkno(bucket);
3633         u16 xh_free_start;
3634         size_t blocksize = inode->i_sb->s_blocksize;
3635         struct ocfs2_xattr_entry *xe;
3636
3637         /*
3638          * In order to make the operation more efficient and generic,
3639          * we copy all the blocks into a contiguous memory and do the
3640          * defragment there, so if anything is error, we will not touch
3641          * the real block.
3642          */
3643         bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
3644         if (!bucket_buf) {
3645                 ret = -EIO;
3646                 goto out;
3647         }
3648
3649         buf = bucket_buf;
3650         for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
3651                 memcpy(buf, bucket_block(bucket, i), blocksize);
3652
3653         ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
3654                                                 OCFS2_JOURNAL_ACCESS_WRITE);
3655         if (ret < 0) {
3656                 mlog_errno(ret);
3657                 goto out;
3658         }
3659
3660         xh = (struct ocfs2_xattr_header *)bucket_buf;
3661         entries = (char *)xh->xh_entries;
3662         xh_free_start = le16_to_cpu(xh->xh_free_start);
3663
3664         mlog(0, "adjust xattr bucket in %llu, count = %u, "
3665              "xh_free_start = %u, xh_name_value_len = %u.\n",
3666              (unsigned long long)blkno, le16_to_cpu(xh->xh_count),
3667              xh_free_start, le16_to_cpu(xh->xh_name_value_len));
3668
3669         /*
3670          * sort all the entries by their offset.
3671          * the largest will be the first, so that we can
3672          * move them to the end one by one.
3673          */
3674         sort(entries, le16_to_cpu(xh->xh_count),
3675              sizeof(struct ocfs2_xattr_entry),
3676              cmp_xe_offset, swap_xe);
3677
3678         /* Move all name/values to the end of the bucket. */
3679         xe = xh->xh_entries;
3680         end = OCFS2_XATTR_BUCKET_SIZE;
3681         for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
3682                 offset = le16_to_cpu(xe->xe_name_offset);
3683                 if (ocfs2_xattr_is_local(xe))
3684                         value_len = OCFS2_XATTR_SIZE(
3685                                         le64_to_cpu(xe->xe_value_size));
3686                 else
3687                         value_len = OCFS2_XATTR_ROOT_SIZE;
3688                 len = OCFS2_XATTR_SIZE(xe->xe_name_len) + value_len;
3689
3690                 /*
3691                  * We must make sure that the name/value pair
3692                  * exist in the same block. So adjust end to
3693                  * the previous block end if needed.
3694                  */
3695                 if (((end - len) / blocksize !=
3696                         (end - 1) / blocksize))
3697                         end = end - end % blocksize;
3698
3699                 if (end > offset + len) {
3700                         memmove(bucket_buf + end - len,
3701                                 bucket_buf + offset, len);
3702                         xe->xe_name_offset = cpu_to_le16(end - len);
3703                 }
3704
3705                 mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
3706                                 "bucket %llu\n", (unsigned long long)blkno);
3707
3708                 end -= len;
3709         }
3710
3711         mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
3712                         "bucket %llu\n", (unsigned long long)blkno);
3713
3714         if (xh_free_start == end)
3715                 goto out;
3716
3717         memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
3718         xh->xh_free_start = cpu_to_le16(end);
3719
3720         /* sort the entries by their name_hash. */
3721         sort(entries, le16_to_cpu(xh->xh_count),
3722              sizeof(struct ocfs2_xattr_entry),
3723              cmp_xe, swap_xe);
3724
3725         buf = bucket_buf;
3726         for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
3727                 memcpy(bucket_block(bucket, i), buf, blocksize);
3728         ocfs2_xattr_bucket_journal_dirty(handle, bucket);
3729
3730 out:
3731         kfree(bucket_buf);
3732         return ret;
3733 }
3734
3735 /*
3736  * prev_blkno points to the start of an existing extent.  new_blkno
3737  * points to a newly allocated extent.  Because we know each of our
3738  * clusters contains more than bucket, we can easily split one cluster
3739  * at a bucket boundary.  So we take the last cluster of the existing
3740  * extent and split it down the middle.  We move the last half of the
3741  * buckets in the last cluster of the existing extent over to the new
3742  * extent.
3743  *
3744  * first_bh is the buffer at prev_blkno so we can update the existing
3745  * extent's bucket count.  header_bh is the bucket were we were hoping
3746  * to insert our xattr.  If the bucket move places the target in the new
3747  * extent, we'll update first_bh and header_bh after modifying the old
3748  * extent.
3749  *
3750  * first_hash will be set as the 1st xe's name_hash in the new extent.
3751  */
3752 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
3753                                                handle_t *handle,
3754                                                struct ocfs2_xattr_bucket *first,
3755                                                struct ocfs2_xattr_bucket *target,
3756                                                u64 new_blkno,
3757                                                u32 num_clusters,
3758                                                u32 *first_hash)
3759 {
3760         int ret;
3761         struct super_block *sb = inode->i_sb;
3762         int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(sb);
3763         int num_buckets = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(sb));
3764         int to_move = num_buckets / 2;
3765         u64 src_blkno;
3766         u64 last_cluster_blkno = bucket_blkno(first) +
3767                 ((num_clusters - 1) * ocfs2_clusters_to_blocks(sb, 1));
3768
3769         BUG_ON(le16_to_cpu(bucket_xh(first)->xh_num_buckets) < num_buckets);
3770         BUG_ON(OCFS2_XATTR_BUCKET_SIZE == OCFS2_SB(sb)->s_clustersize);
3771
3772         mlog(0, "move half of xattrs in cluster %llu to %llu\n",
3773              (unsigned long long)last_cluster_blkno, (unsigned long long)new_blkno);
3774
3775         ret = ocfs2_mv_xattr_buckets(inode, handle, bucket_blkno(first),
3776                                      last_cluster_blkno, new_blkno,
3777                                      to_move, first_hash);
3778         if (ret) {
3779                 mlog_errno(ret);
3780                 goto out;
3781         }
3782
3783         /* This is the first bucket that got moved */
3784         src_blkno = last_cluster_blkno + (to_move * blks_per_bucket);
3785
3786         /*
3787          * If the target bucket was part of the moved buckets, we need to
3788          * update first and target.
3789          */
3790         if (bucket_blkno(target) >= src_blkno) {
3791                 /* Find the block for the new target bucket */
3792                 src_blkno = new_blkno +
3793                         (bucket_blkno(target) - src_blkno);
3794
3795                 ocfs2_xattr_bucket_relse(first);
3796                 ocfs2_xattr_bucket_relse(target);
3797
3798                 /*
3799                  * These shouldn't fail - the buffers are in the
3800                  * journal from ocfs2_cp_xattr_bucket().
3801                  */
3802                 ret = ocfs2_read_xattr_bucket(first, new_blkno);
3803                 if (ret) {
3804                         mlog_errno(ret);
3805                         goto out;
3806                 }
3807                 ret = ocfs2_read_xattr_bucket(target, src_blkno);
3808                 if (ret)
3809                         mlog_errno(ret);
3810
3811         }
3812
3813 out:
3814         return ret;
3815 }
3816
3817 /*
3818  * Find the suitable pos when we divide a bucket into 2.
3819  * We have to make sure the xattrs with the same hash value exist
3820  * in the same bucket.
3821  *
3822  * If this ocfs2_xattr_header covers more than one hash value, find a
3823  * place where the hash value changes.  Try to find the most even split.
3824  * The most common case is that all entries have different hash values,
3825  * and the first check we make will find a place to split.
3826  */
3827 static int ocfs2_xattr_find_divide_pos(struct ocfs2_xattr_header *xh)
3828 {
3829         struct ocfs2_xattr_entry *entries = xh->xh_entries;
3830         int count = le16_to_cpu(xh->xh_count);
3831         int delta, middle = count / 2;
3832
3833         /*
3834          * We start at the middle.  Each step gets farther away in both
3835          * directions.  We therefore hit the change in hash value
3836          * nearest to the middle.  Note that this loop does not execute for
3837          * count < 2.
3838          */
3839         for (delta = 0; delta < middle; delta++) {
3840                 /* Let's check delta earlier than middle */
3841                 if (cmp_xe(&entries[middle - delta - 1],
3842                            &entries[middle - delta]))
3843                         return middle - delta;
3844
3845                 /* For even counts, don't walk off the end */
3846                 if ((middle + delta + 1) == count)
3847                         continue;
3848
3849                 /* Now try delta past middle */
3850                 if (cmp_xe(&entries[middle + delta],
3851                            &entries[middle + delta + 1]))
3852                         return middle + delta + 1;
3853         }
3854
3855         /* Every entry had the same hash */
3856         return count;
3857 }
3858
3859 /*
3860  * Move some xattrs in old bucket(blk) to new bucket(new_blk).
3861  * first_hash will record the 1st hash of the new bucket.
3862  *
3863  * Normally half of the xattrs will be moved.  But we have to make
3864  * sure that the xattrs with the same hash value are stored in the
3865  * same bucket. If all the xattrs in this bucket have the same hash
3866  * value, the new bucket will be initialized as an empty one and the
3867  * first_hash will be initialized as (hash_value+1).
3868  */
3869 static int ocfs2_divide_xattr_bucket(struct inode *inode,
3870                                     handle_t *handle,
3871                                     u64 blk,
3872                                     u64 new_blk,
3873                                     u32 *first_hash,
3874                                     int new_bucket_head)
3875 {
3876         int ret, i;
3877         int count, start, len, name_value_len = 0, xe_len, name_offset = 0;
3878         struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
3879         struct ocfs2_xattr_header *xh;
3880         struct ocfs2_xattr_entry *xe;
3881         int blocksize = inode->i_sb->s_blocksize;
3882
3883         mlog(0, "move some of xattrs from bucket %llu to %llu\n",
3884              (unsigned long long)blk, (unsigned long long)new_blk);
3885
3886         s_bucket = ocfs2_xattr_bucket_new(inode);
3887         t_bucket = ocfs2_xattr_bucket_new(inode);
3888         if (!s_bucket || !t_bucket) {
3889                 ret = -ENOMEM;
3890                 mlog_errno(ret);
3891                 goto out;
3892         }
3893
3894         ret = ocfs2_read_xattr_bucket(s_bucket, blk);
3895         if (ret) {
3896                 mlog_errno(ret);
3897                 goto out;
3898         }
3899
3900         ret = ocfs2_xattr_bucket_journal_access(handle, s_bucket,
3901                                                 OCFS2_JOURNAL_ACCESS_WRITE);
3902         if (ret) {
3903                 mlog_errno(ret);
3904                 goto out;
3905         }
3906
3907         /*
3908          * Even if !new_bucket_head, we're overwriting t_bucket.  Thus,
3909          * there's no need to read it.
3910          */
3911         ret = ocfs2_init_xattr_bucket(t_bucket, new_blk);
3912         if (ret) {
3913                 mlog_errno(ret);
3914                 goto out;
3915         }
3916
3917         /*
3918          * Hey, if we're overwriting t_bucket, what difference does
3919          * ACCESS_CREATE vs ACCESS_WRITE make?  See the comment in the
3920          * same part of ocfs2_cp_xattr_bucket().
3921          */
3922         ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
3923                                                 new_bucket_head ?
3924                                                 OCFS2_JOURNAL_ACCESS_CREATE :
3925                                                 OCFS2_JOURNAL_ACCESS_WRITE);
3926         if (ret) {
3927                 mlog_errno(ret);
3928                 goto out;
3929         }
3930
3931         xh = bucket_xh(s_bucket);
3932         count = le16_to_cpu(xh->xh_count);
3933         start = ocfs2_xattr_find_divide_pos(xh);
3934
3935         if (start == count) {
3936                 xe = &xh->xh_entries[start-1];
3937
3938                 /*
3939                  * initialized a new empty bucket here.
3940                  * The hash value is set as one larger than
3941                  * that of the last entry in the previous bucket.
3942                  */
3943                 for (i = 0; i < t_bucket->bu_blocks; i++)
3944                         memset(bucket_block(t_bucket, i), 0, blocksize);
3945
3946                 xh = bucket_xh(t_bucket);
3947                 xh->xh_free_start = cpu_to_le16(blocksize);
3948                 xh->xh_entries[0].xe_name_hash = xe->xe_name_hash;
3949                 le32_add_cpu(&xh->xh_entries[0].xe_name_hash, 1);
3950
3951                 goto set_num_buckets;
3952         }
3953
3954         /* copy the whole bucket to the new first. */
3955         ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
3956
3957         /* update the new bucket. */
3958         xh = bucket_xh(t_bucket);
3959
3960         /*
3961          * Calculate the total name/value len and xh_free_start for
3962          * the old bucket first.
3963          */
3964         name_offset = OCFS2_XATTR_BUCKET_SIZE;
3965         name_value_len = 0;
3966         for (i = 0; i < start; i++) {
3967                 xe = &xh->xh_entries[i];
3968                 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3969                 if (ocfs2_xattr_is_local(xe))
3970                         xe_len +=
3971                            OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3972                 else
3973                         xe_len += OCFS2_XATTR_ROOT_SIZE;
3974                 name_value_len += xe_len;
3975                 if (le16_to_cpu(xe->xe_name_offset) < name_offset)
3976                         name_offset = le16_to_cpu(xe->xe_name_offset);
3977         }
3978
3979         /*
3980          * Now begin the modification to the new bucket.
3981          *
3982          * In the new bucket, We just move the xattr entry to the beginning
3983          * and don't touch the name/value. So there will be some holes in the
3984          * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
3985          * called.
3986          */
3987         xe = &xh->xh_entries[start];
3988         len = sizeof(struct ocfs2_xattr_entry) * (count - start);
3989         mlog(0, "mv xattr entry len %d from %d to %d\n", len,
3990              (int)((char *)xe - (char *)xh),
3991              (int)((char *)xh->xh_entries - (char *)xh));
3992         memmove((char *)xh->xh_entries, (char *)xe, len);
3993         xe = &xh->xh_entries[count - start];
3994         len = sizeof(struct ocfs2_xattr_entry) * start;
3995         memset((char *)xe, 0, len);
3996
3997         le16_add_cpu(&xh->xh_count, -start);
3998         le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
3999
4000         /* Calculate xh_free_start for the new bucket. */
4001         xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
4002         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
4003                 xe = &xh->xh_entries[i];
4004                 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
4005                 if (ocfs2_xattr_is_local(xe))
4006                         xe_len +=
4007                            OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
4008                 else
4009                         xe_len += OCFS2_XATTR_ROOT_SIZE;
4010                 if (le16_to_cpu(xe->xe_name_offset) <
4011                     le16_to_cpu(xh->xh_free_start))
4012                         xh->xh_free_start = xe->xe_name_offset;
4013         }
4014
4015 set_num_buckets:
4016         /* set xh->xh_num_buckets for the new xh. */
4017         if (new_bucket_head)
4018                 xh->xh_num_buckets = cpu_to_le16(1);
4019         else
4020                 xh->xh_num_buckets = 0;
4021
4022         ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4023
4024         /* store the first_hash of the new bucket. */
4025         if (first_hash)
4026                 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
4027
4028         /*
4029          * Now only update the 1st block of the old bucket.  If we
4030          * just added a new empty bucket, there is no need to modify
4031          * it.
4032          */
4033         if (start == count)
4034                 goto out;
4035
4036         xh = bucket_xh(s_bucket);
4037         memset(&xh->xh_entries[start], 0,
4038                sizeof(struct ocfs2_xattr_entry) * (count - start));
4039         xh->xh_count = cpu_to_le16(start);
4040         xh->xh_free_start = cpu_to_le16(name_offset);
4041         xh->xh_name_value_len = cpu_to_le16(name_value_len);
4042
4043         ocfs2_xattr_bucket_journal_dirty(handle, s_bucket);
4044
4045 out:
4046         ocfs2_xattr_bucket_free(s_bucket);
4047         ocfs2_xattr_bucket_free(t_bucket);
4048
4049         return ret;
4050 }
4051
4052 /*
4053  * Copy xattr from one bucket to another bucket.
4054  *
4055  * The caller must make sure that the journal transaction
4056  * has enough space for journaling.
4057  */
4058 static int ocfs2_cp_xattr_bucket(struct inode *inode,
4059                                  handle_t *handle,
4060                                  u64 s_blkno,
4061                                  u64 t_blkno,
4062                                  int t_is_new)
4063 {
4064         int ret;
4065         struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
4066
4067         BUG_ON(s_blkno == t_blkno);
4068
4069         mlog(0, "cp bucket %llu to %llu, target is %d\n",
4070              (unsigned long long)s_blkno, (unsigned long long)t_blkno,
4071              t_is_new);
4072
4073         s_bucket = ocfs2_xattr_bucket_new(inode);
4074         t_bucket = ocfs2_xattr_bucket_new(inode);
4075         if (!s_bucket || !t_bucket) {
4076                 ret = -ENOMEM;
4077                 mlog_errno(ret);
4078                 goto out;
4079         }
4080
4081         ret = ocfs2_read_xattr_bucket(s_bucket, s_blkno);
4082         if (ret)
4083                 goto out;
4084
4085         /*
4086          * Even if !t_is_new, we're overwriting t_bucket.  Thus,
4087          * there's no need to read it.
4088          */
4089         ret = ocfs2_init_xattr_bucket(t_bucket, t_blkno);
4090         if (ret)
4091                 goto out;
4092
4093         /*
4094          * Hey, if we're overwriting t_bucket, what difference does
4095          * ACCESS_CREATE vs ACCESS_WRITE make?  Well, if we allocated a new
4096          * cluster to fill, we came here from
4097          * ocfs2_mv_xattr_buckets(), and it is really new -
4098          * ACCESS_CREATE is required.  But we also might have moved data
4099          * out of t_bucket before extending back into it.
4100          * ocfs2_add_new_xattr_bucket() can do this - its call to
4101          * ocfs2_add_new_xattr_cluster() may have created a new extent
4102          * and copied out the end of the old extent.  Then it re-extends
4103          * the old extent back to create space for new xattrs.  That's
4104          * how we get here, and the bucket isn't really new.
4105          */
4106         ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4107                                                 t_is_new ?
4108                                                 OCFS2_JOURNAL_ACCESS_CREATE :
4109                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4110         if (ret)
4111                 goto out;
4112
4113         ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4114         ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4115
4116 out:
4117         ocfs2_xattr_bucket_free(t_bucket);
4118         ocfs2_xattr_bucket_free(s_bucket);
4119
4120         return ret;
4121 }
4122
4123 /*
4124  * src_blk points to the start of an existing extent.  last_blk points to
4125  * last cluster in that extent.  to_blk points to a newly allocated
4126  * extent.  We copy the buckets from the cluster at last_blk to the new
4127  * extent.  If start_bucket is non-zero, we skip that many buckets before
4128  * we start copying.  The new extent's xh_num_buckets gets set to the
4129  * number of buckets we copied.  The old extent's xh_num_buckets shrinks
4130  * by the same amount.
4131  */
4132 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
4133                                   u64 src_blk, u64 last_blk, u64 to_blk,
4134                                   unsigned int start_bucket,
4135                                   u32 *first_hash)
4136 {
4137         int i, ret, credits;
4138         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4139         int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4140         int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
4141         struct ocfs2_xattr_bucket *old_first, *new_first;
4142
4143         mlog(0, "mv xattrs from cluster %llu to %llu\n",
4144              (unsigned long long)last_blk, (unsigned long long)to_blk);
4145
4146         BUG_ON(start_bucket >= num_buckets);
4147         if (start_bucket) {
4148                 num_buckets -= start_bucket;
4149                 last_blk += (start_bucket * blks_per_bucket);
4150         }
4151
4152         /* The first bucket of the original extent */
4153         old_first = ocfs2_xattr_bucket_new(inode);
4154         /* The first bucket of the new extent */
4155         new_first = ocfs2_xattr_bucket_new(inode);
4156         if (!old_first || !new_first) {
4157                 ret = -ENOMEM;
4158                 mlog_errno(ret);
4159                 goto out;
4160         }
4161
4162         ret = ocfs2_read_xattr_bucket(old_first, src_blk);
4163         if (ret) {
4164                 mlog_errno(ret);
4165                 goto out;
4166         }
4167
4168         /*
4169          * We need to update the first bucket of the old extent and all
4170          * the buckets going to the new extent.
4171          */
4172         credits = ((num_buckets + 1) * blks_per_bucket) +
4173                 handle->h_buffer_credits;
4174         ret = ocfs2_extend_trans(handle, credits);
4175         if (ret) {
4176                 mlog_errno(ret);
4177                 goto out;
4178         }
4179
4180         ret = ocfs2_xattr_bucket_journal_access(handle, old_first,
4181                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4182         if (ret) {
4183                 mlog_errno(ret);
4184                 goto out;
4185         }
4186
4187         for (i = 0; i < num_buckets; i++) {
4188                 ret = ocfs2_cp_xattr_bucket(inode, handle,
4189                                             last_blk + (i * blks_per_bucket),
4190                                             to_blk + (i * blks_per_bucket),
4191                                             1);
4192                 if (ret) {
4193                         mlog_errno(ret);
4194                         goto out;
4195                 }
4196         }
4197
4198         /*
4199          * Get the new bucket ready before we dirty anything
4200          * (This actually shouldn't fail, because we already dirtied
4201          * it once in ocfs2_cp_xattr_bucket()).
4202          */
4203         ret = ocfs2_read_xattr_bucket(new_first, to_blk);
4204         if (ret) {
4205                 mlog_errno(ret);
4206                 goto out;
4207         }
4208         ret = ocfs2_xattr_bucket_journal_access(handle, new_first,
4209                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4210         if (ret) {
4211                 mlog_errno(ret);
4212                 goto out;
4213         }
4214
4215         /* Now update the headers */
4216         le16_add_cpu(&bucket_xh(old_first)->xh_num_buckets, -num_buckets);
4217         ocfs2_xattr_bucket_journal_dirty(handle, old_first);
4218
4219         bucket_xh(new_first)->xh_num_buckets = cpu_to_le16(num_buckets);
4220         ocfs2_xattr_bucket_journal_dirty(handle, new_first);
4221
4222         if (first_hash)
4223                 *first_hash = le32_to_cpu(bucket_xh(new_first)->xh_entries[0].xe_name_hash);
4224
4225 out:
4226         ocfs2_xattr_bucket_free(new_first);
4227         ocfs2_xattr_bucket_free(old_first);
4228         return ret;
4229 }
4230
4231 /*
4232  * Move some xattrs in this cluster to the new cluster.
4233  * This function should only be called when bucket size == cluster size.
4234  * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
4235  */
4236 static int ocfs2_divide_xattr_cluster(struct inode *inode,
4237                                       handle_t *handle,
4238                                       u64 prev_blk,
4239                                       u64 new_blk,
4240                                       u32 *first_hash)
4241 {
4242         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4243         int ret, credits = 2 * blk_per_bucket + handle->h_buffer_credits;
4244
4245         BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
4246
4247         ret = ocfs2_extend_trans(handle, credits);
4248         if (ret) {
4249                 mlog_errno(ret);
4250                 return ret;
4251         }
4252
4253         /* Move half of the xattr in start_blk to the next bucket. */
4254         return  ocfs2_divide_xattr_bucket(inode, handle, prev_blk,
4255                                           new_blk, first_hash, 1);
4256 }
4257
4258 /*
4259  * Move some xattrs from the old cluster to the new one since they are not
4260  * contiguous in ocfs2 xattr tree.
4261  *
4262  * new_blk starts a new separate cluster, and we will move some xattrs from
4263  * prev_blk to it. v_start will be set as the first name hash value in this
4264  * new cluster so that it can be used as e_cpos during tree insertion and
4265  * don't collide with our original b-tree operations. first_bh and header_bh
4266  * will also be updated since they will be used in ocfs2_extend_xattr_bucket
4267  * to extend the insert bucket.
4268  *
4269  * The problem is how much xattr should we move to the new one and when should
4270  * we update first_bh and header_bh?
4271  * 1. If cluster size > bucket size, that means the previous cluster has more
4272  *    than 1 bucket, so just move half nums of bucket into the new cluster and
4273  *    update the first_bh and header_bh if the insert bucket has been moved
4274  *    to the new cluster.
4275  * 2. If cluster_size == bucket_size:
4276  *    a) If the previous extent rec has more than one cluster and the insert
4277  *       place isn't in the last cluster, copy the entire last cluster to the
4278  *       new one. This time, we don't need to upate the first_bh and header_bh
4279  *       since they will not be moved into the new cluster.
4280  *    b) Otherwise, move the bottom half of the xattrs in the last cluster into
4281  *       the new one. And we set the extend flag to zero if the insert place is
4282  *       moved into the new allocated cluster since no extend is needed.
4283  */
4284 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
4285                                             handle_t *handle,
4286                                             struct ocfs2_xattr_bucket *first,
4287                                             struct ocfs2_xattr_bucket *target,
4288                                             u64 new_blk,
4289                                             u32 prev_clusters,
4290                                             u32 *v_start,
4291                                             int *extend)
4292 {
4293         int ret;
4294
4295         mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n",
4296              (unsigned long long)bucket_blkno(first), prev_clusters,
4297              (unsigned long long)new_blk);
4298
4299         if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1) {
4300                 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
4301                                                           handle,
4302                                                           first, target,
4303                                                           new_blk,
4304                                                           prev_clusters,
4305                                                           v_start);
4306                 if (ret)
4307                         mlog_errno(ret);
4308         } else {
4309                 /* The start of the last cluster in the first extent */
4310                 u64 last_blk = bucket_blkno(first) +
4311                         ((prev_clusters - 1) *
4312                          ocfs2_clusters_to_blocks(inode->i_sb, 1));
4313
4314                 if (prev_clusters > 1 && bucket_blkno(target) != last_blk) {
4315                         ret = ocfs2_mv_xattr_buckets(inode, handle,
4316                                                      bucket_blkno(first),
4317                                                      last_blk, new_blk, 0,
4318                                                      v_start);
4319                         if (ret)
4320                                 mlog_errno(ret);
4321                 } else {
4322                         ret = ocfs2_divide_xattr_cluster(inode, handle,
4323                                                          last_blk, new_blk,
4324                                                          v_start);
4325                         if (ret)
4326                                 mlog_errno(ret);
4327
4328                         if ((bucket_blkno(target) == last_blk) && extend)
4329                                 *extend = 0;
4330                 }
4331         }
4332
4333         return ret;
4334 }
4335
4336 /*
4337  * Add a new cluster for xattr storage.
4338  *
4339  * If the new cluster is contiguous with the previous one, it will be
4340  * appended to the same extent record, and num_clusters will be updated.
4341  * If not, we will insert a new extent for it and move some xattrs in
4342  * the last cluster into the new allocated one.
4343  * We also need to limit the maximum size of a btree leaf, otherwise we'll
4344  * lose the benefits of hashing because we'll have to search large leaves.
4345  * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
4346  * if it's bigger).
4347  *
4348  * first_bh is the first block of the previous extent rec and header_bh
4349  * indicates the bucket we will insert the new xattrs. They will be updated
4350  * when the header_bh is moved into the new cluster.
4351  */
4352 static int ocfs2_add_new_xattr_cluster(struct inode *inode,
4353                                        struct buffer_head *root_bh,
4354                                        struct ocfs2_xattr_bucket *first,
4355                                        struct ocfs2_xattr_bucket *target,
4356                                        u32 *num_clusters,
4357                                        u32 prev_cpos,
4358                                        int *extend,
4359                                        struct ocfs2_xattr_set_ctxt *ctxt)
4360 {
4361         int ret;
4362         u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
4363         u32 prev_clusters = *num_clusters;
4364         u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
4365         u64 block;
4366         handle_t *handle = ctxt->handle;
4367         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4368         struct ocfs2_extent_tree et;
4369
4370         mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, "
4371              "previous xattr blkno = %llu\n",
4372              (unsigned long long)OCFS2_I(inode)->ip_blkno,
4373              prev_cpos, (unsigned long long)bucket_blkno(first));
4374
4375         ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
4376
4377         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
4378                                       OCFS2_JOURNAL_ACCESS_WRITE);
4379         if (ret < 0) {
4380                 mlog_errno(ret);
4381                 goto leave;
4382         }
4383
4384         ret = __ocfs2_claim_clusters(osb, handle, ctxt->data_ac, 1,
4385                                      clusters_to_add, &bit_off, &num_bits);
4386         if (ret < 0) {
4387                 if (ret != -ENOSPC)
4388                         mlog_errno(ret);
4389                 goto leave;
4390         }
4391
4392         BUG_ON(num_bits > clusters_to_add);
4393
4394         block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
4395         mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n",
4396              num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
4397
4398         if (bucket_blkno(first) + (prev_clusters * bpc) == block &&
4399             (prev_clusters + num_bits) << osb->s_clustersize_bits <=
4400              OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
4401                 /*
4402                  * If this cluster is contiguous with the old one and
4403                  * adding this new cluster, we don't surpass the limit of
4404                  * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
4405                  * initialized and used like other buckets in the previous
4406                  * cluster.
4407                  * So add it as a contiguous one. The caller will handle
4408                  * its init process.
4409                  */
4410                 v_start = prev_cpos + prev_clusters;
4411                 *num_clusters = prev_clusters + num_bits;
4412                 mlog(0, "Add contiguous %u clusters to previous extent rec.\n",
4413                      num_bits);
4414         } else {
4415                 ret = ocfs2_adjust_xattr_cross_cluster(inode,
4416                                                        handle,
4417                                                        first,
4418                                                        target,
4419                                                        block,
4420                                                        prev_clusters,
4421                                                        &v_start,
4422                                                        extend);
4423                 if (ret) {
4424                         mlog_errno(ret);
4425                         goto leave;
4426                 }
4427         }
4428
4429         mlog(0, "Insert %u clusters at block %llu for xattr at %u\n",
4430              num_bits, (unsigned long long)block, v_start);
4431         ret = ocfs2_insert_extent(handle, &et, v_start, block,
4432                                   num_bits, 0, ctxt->meta_ac);
4433         if (ret < 0) {
4434                 mlog_errno(ret);
4435                 goto leave;
4436         }
4437
4438         ret = ocfs2_journal_dirty(handle, root_bh);
4439         if (ret < 0)
4440                 mlog_errno(ret);
4441
4442 leave:
4443         return ret;
4444 }
4445
4446 /*
4447  * We are given an extent.  'first' is the bucket at the very front of
4448  * the extent.  The extent has space for an additional bucket past
4449  * bucket_xh(first)->xh_num_buckets.  'target_blkno' is the block number
4450  * of the target bucket.  We wish to shift every bucket past the target
4451  * down one, filling in that additional space.  When we get back to the
4452  * target, we split the target between itself and the now-empty bucket
4453  * at target+1 (aka, target_blkno + blks_per_bucket).
4454  */
4455 static int ocfs2_extend_xattr_bucket(struct inode *inode,
4456                                      handle_t *handle,
4457                                      struct ocfs2_xattr_bucket *first,
4458                                      u64 target_blk,
4459                                      u32 num_clusters)
4460 {
4461         int ret, credits;
4462         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4463         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4464         u64 end_blk;
4465         u16 new_bucket = le16_to_cpu(bucket_xh(first)->xh_num_buckets);
4466
4467         mlog(0, "extend xattr bucket in %llu, xattr extend rec starting "
4468              "from %llu, len = %u\n", (unsigned long long)target_blk,
4469              (unsigned long long)bucket_blkno(first), num_clusters);
4470
4471         /* The extent must have room for an additional bucket */
4472         BUG_ON(new_bucket >=
4473                (num_clusters * ocfs2_xattr_buckets_per_cluster(osb)));
4474
4475         /* end_blk points to the last existing bucket */
4476         end_blk = bucket_blkno(first) + ((new_bucket - 1) * blk_per_bucket);
4477
4478         /*
4479          * end_blk is the start of the last existing bucket.
4480          * Thus, (end_blk - target_blk) covers the target bucket and
4481          * every bucket after it up to, but not including, the last
4482          * existing bucket.  Then we add the last existing bucket, the
4483          * new bucket, and the first bucket (3 * blk_per_bucket).
4484          */
4485         credits = (end_blk - target_blk) + (3 * blk_per_bucket) +
4486                   handle->h_buffer_credits;
4487         ret = ocfs2_extend_trans(handle, credits);
4488         if (ret) {
4489                 mlog_errno(ret);
4490                 goto out;
4491         }
4492
4493         ret = ocfs2_xattr_bucket_journal_access(handle, first,
4494                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4495         if (ret) {
4496                 mlog_errno(ret);
4497                 goto out;
4498         }
4499
4500         while (end_blk != target_blk) {
4501                 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
4502                                             end_blk + blk_per_bucket, 0);
4503                 if (ret)
4504                         goto out;
4505                 end_blk -= blk_per_bucket;
4506         }
4507
4508         /* Move half of the xattr in target_blkno to the next bucket. */
4509         ret = ocfs2_divide_xattr_bucket(inode, handle, target_blk,
4510                                         target_blk + blk_per_bucket, NULL, 0);
4511
4512         le16_add_cpu(&bucket_xh(first)->xh_num_buckets, 1);
4513         ocfs2_xattr_bucket_journal_dirty(handle, first);
4514
4515 out:
4516         return ret;
4517 }
4518
4519 /*
4520  * Add new xattr bucket in an extent record and adjust the buckets
4521  * accordingly.  xb_bh is the ocfs2_xattr_block, and target is the
4522  * bucket we want to insert into.
4523  *
4524  * In the easy case, we will move all the buckets after target down by
4525  * one. Half of target's xattrs will be moved to the next bucket.
4526  *
4527  * If current cluster is full, we'll allocate a new one.  This may not
4528  * be contiguous.  The underlying calls will make sure that there is
4529  * space for the insert, shifting buckets around if necessary.
4530  * 'target' may be moved by those calls.
4531  */
4532 static int ocfs2_add_new_xattr_bucket(struct inode *inode,
4533                                       struct buffer_head *xb_bh,
4534                                       struct ocfs2_xattr_bucket *target,
4535                                       struct ocfs2_xattr_set_ctxt *ctxt)
4536 {
4537         struct ocfs2_xattr_block *xb =
4538                         (struct ocfs2_xattr_block *)xb_bh->b_data;
4539         struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
4540         struct ocfs2_extent_list *el = &xb_root->xt_list;
4541         u32 name_hash =
4542                 le32_to_cpu(bucket_xh(target)->xh_entries[0].xe_name_hash);
4543         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4544         int ret, num_buckets, extend = 1;
4545         u64 p_blkno;
4546         u32 e_cpos, num_clusters;
4547         /* The bucket at the front of the extent */
4548         struct ocfs2_xattr_bucket *first;
4549
4550         mlog(0, "Add new xattr bucket starting from %llu\n",
4551              (unsigned long long)bucket_blkno(target));
4552
4553         /* The first bucket of the original extent */
4554         first = ocfs2_xattr_bucket_new(inode);
4555         if (!first) {
4556                 ret = -ENOMEM;
4557                 mlog_errno(ret);
4558                 goto out;
4559         }
4560
4561         ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
4562                                   &num_clusters, el);
4563         if (ret) {
4564                 mlog_errno(ret);
4565                 goto out;
4566         }
4567
4568         ret = ocfs2_read_xattr_bucket(first, p_blkno);
4569         if (ret) {
4570                 mlog_errno(ret);
4571                 goto out;
4572         }
4573
4574         num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
4575         if (num_buckets == le16_to_cpu(bucket_xh(first)->xh_num_buckets)) {
4576                 /*
4577                  * This can move first+target if the target bucket moves
4578                  * to the new extent.
4579                  */
4580                 ret = ocfs2_add_new_xattr_cluster(inode,
4581                                                   xb_bh,
4582                                                   first,
4583                                                   target,
4584                                                   &num_clusters,
4585                                                   e_cpos,
4586                                                   &extend,
4587                                                   ctxt);
4588                 if (ret) {
4589                         mlog_errno(ret);
4590                         goto out;
4591                 }
4592         }
4593
4594         if (extend) {
4595                 ret = ocfs2_extend_xattr_bucket(inode,
4596                                                 ctxt->handle,
4597                                                 first,
4598                                                 bucket_blkno(target),
4599                                                 num_clusters);
4600                 if (ret)
4601                         mlog_errno(ret);
4602         }
4603
4604 out:
4605         ocfs2_xattr_bucket_free(first);
4606
4607         return ret;
4608 }
4609
4610 static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode,
4611                                         struct ocfs2_xattr_bucket *bucket,
4612                                         int offs)
4613 {
4614         int block_off = offs >> inode->i_sb->s_blocksize_bits;
4615
4616         offs = offs % inode->i_sb->s_blocksize;
4617         return bucket_block(bucket, block_off) + offs;
4618 }
4619
4620 /*
4621  * Handle the normal xattr set, including replace, delete and new.
4622  *
4623  * Note: "local" indicates the real data's locality. So we can't
4624  * just its bucket locality by its length.
4625  */
4626 static void ocfs2_xattr_set_entry_normal(struct inode *inode,
4627                                          struct ocfs2_xattr_info *xi,
4628                                          struct ocfs2_xattr_search *xs,
4629                                          u32 name_hash,
4630                                          int local)
4631 {
4632         struct ocfs2_xattr_entry *last, *xe;
4633         int name_len = strlen(xi->name);
4634         struct ocfs2_xattr_header *xh = xs->header;
4635         u16 count = le16_to_cpu(xh->xh_count), start;
4636         size_t blocksize = inode->i_sb->s_blocksize;
4637         char *val;
4638         size_t offs, size, new_size;
4639
4640         last = &xh->xh_entries[count];
4641         if (!xs->not_found) {
4642                 xe = xs->here;
4643                 offs = le16_to_cpu(xe->xe_name_offset);
4644                 if (ocfs2_xattr_is_local(xe))
4645                         size = OCFS2_XATTR_SIZE(name_len) +
4646                         OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
4647                 else
4648                         size = OCFS2_XATTR_SIZE(name_len) +
4649                         OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
4650
4651                 /*
4652                  * If the new value will be stored outside, xi->value has been
4653                  * initalized as an empty ocfs2_xattr_value_root, and the same
4654                  * goes with xi->value_len, so we can set new_size safely here.
4655                  * See ocfs2_xattr_set_in_bucket.
4656                  */
4657                 new_size = OCFS2_XATTR_SIZE(name_len) +
4658                            OCFS2_XATTR_SIZE(xi->value_len);
4659
4660                 le16_add_cpu(&xh->xh_name_value_len, -size);
4661                 if (xi->value) {
4662                         if (new_size > size)
4663                                 goto set_new_name_value;
4664
4665                         /* Now replace the old value with new one. */
4666                         if (local)
4667                                 xe->xe_value_size = cpu_to_le64(xi->value_len);
4668                         else
4669                                 xe->xe_value_size = 0;
4670
4671                         val = ocfs2_xattr_bucket_get_val(inode,
4672                                                          xs->bucket, offs);
4673                         memset(val + OCFS2_XATTR_SIZE(name_len), 0,
4674                                size - OCFS2_XATTR_SIZE(name_len));
4675                         if (OCFS2_XATTR_SIZE(xi->value_len) > 0)
4676                                 memcpy(val + OCFS2_XATTR_SIZE(name_len),
4677                                        xi->value, xi->value_len);
4678
4679                         le16_add_cpu(&xh->xh_name_value_len, new_size);
4680                         ocfs2_xattr_set_local(xe, local);
4681                         return;
4682                 } else {
4683                         /*
4684                          * Remove the old entry if there is more than one.
4685                          * We don't remove the last entry so that we can
4686                          * use it to indicate the hash value of the empty
4687                          * bucket.
4688                          */
4689                         last -= 1;
4690                         le16_add_cpu(&xh->xh_count, -1);
4691                         if (xh->xh_count) {
4692                                 memmove(xe, xe + 1,
4693                                         (void *)last - (void *)xe);
4694                                 memset(last, 0,
4695                                        sizeof(struct ocfs2_xattr_entry));
4696                         } else
4697                                 xh->xh_free_start =
4698                                         cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
4699
4700                         return;
4701                 }
4702         } else {
4703                 /* find a new entry for insert. */
4704                 int low = 0, high = count - 1, tmp;
4705                 struct ocfs2_xattr_entry *tmp_xe;
4706
4707                 while (low <= high && count) {
4708                         tmp = (low + high) / 2;
4709                         tmp_xe = &xh->xh_entries[tmp];
4710
4711                         if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
4712                                 low = tmp + 1;
4713                         else if (name_hash <
4714                                  le32_to_cpu(tmp_xe->xe_name_hash))
4715                                 high = tmp - 1;
4716                         else {
4717                                 low = tmp;
4718                                 break;
4719                         }
4720                 }
4721
4722                 xe = &xh->xh_entries[low];
4723                 if (low != count)
4724                         memmove(xe + 1, xe, (void *)last - (void *)xe);
4725
4726                 le16_add_cpu(&xh->xh_count, 1);
4727                 memset(xe, 0, sizeof(struct ocfs2_xattr_entry));
4728                 xe->xe_name_hash = cpu_to_le32(name_hash);
4729                 xe->xe_name_len = name_len;
4730                 ocfs2_xattr_set_type(xe, xi->name_index);
4731         }
4732
4733 set_new_name_value:
4734         /* Insert the new name+value. */
4735         size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len);
4736
4737         /*
4738          * We must make sure that the name/value pair
4739          * exists in the same block.
4740          */
4741         offs = le16_to_cpu(xh->xh_free_start);
4742         start = offs - size;
4743
4744         if (start >> inode->i_sb->s_blocksize_bits !=
4745             (offs - 1) >> inode->i_sb->s_blocksize_bits) {
4746                 offs = offs - offs % blocksize;
4747                 xh->xh_free_start = cpu_to_le16(offs);
4748         }
4749
4750         val = ocfs2_xattr_bucket_get_val(inode, xs->bucket, offs - size);
4751         xe->xe_name_offset = cpu_to_le16(offs - size);
4752
4753         memset(val, 0, size);
4754         memcpy(val, xi->name, name_len);
4755         memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len);
4756
4757         xe->xe_value_size = cpu_to_le64(xi->value_len);
4758         ocfs2_xattr_set_local(xe, local);
4759         xs->here = xe;
4760         le16_add_cpu(&xh->xh_free_start, -size);
4761         le16_add_cpu(&xh->xh_name_value_len, size);
4762
4763         return;
4764 }
4765
4766 /*
4767  * Set the xattr entry in the specified bucket.
4768  * The bucket is indicated by xs->bucket and it should have the enough
4769  * space for the xattr insertion.
4770  */
4771 static int ocfs2_xattr_set_entry_in_bucket(struct inode *inode,
4772                                            handle_t *handle,
4773                                            struct ocfs2_xattr_info *xi,
4774                                            struct ocfs2_xattr_search *xs,
4775                                            u32 name_hash,
4776                                            int local)
4777 {
4778         int ret;
4779         u64 blkno;
4780
4781         mlog(0, "Set xattr entry len = %lu index = %d in bucket %llu\n",
4782              (unsigned long)xi->value_len, xi->name_index,
4783              (unsigned long long)bucket_blkno(xs->bucket));
4784
4785         if (!xs->bucket->bu_bhs[1]) {
4786                 blkno = bucket_blkno(xs->bucket);
4787                 ocfs2_xattr_bucket_relse(xs->bucket);
4788                 ret = ocfs2_read_xattr_bucket(xs->bucket, blkno);
4789                 if (ret) {
4790                         mlog_errno(ret);
4791                         goto out;
4792                 }
4793         }
4794
4795         ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
4796                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4797         if (ret < 0) {
4798                 mlog_errno(ret);
4799                 goto out;
4800         }
4801
4802         ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash, local);
4803         ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
4804
4805 out:
4806         return ret;
4807 }
4808
4809 /*
4810  * Truncate the specified xe_off entry in xattr bucket.
4811  * bucket is indicated by header_bh and len is the new length.
4812  * Both the ocfs2_xattr_value_root and the entry will be updated here.
4813  *
4814  * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
4815  */
4816 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
4817                                              struct ocfs2_xattr_bucket *bucket,
4818                                              int xe_off,
4819                                              int len,
4820                                              struct ocfs2_xattr_set_ctxt *ctxt)
4821 {
4822         int ret, offset;
4823         u64 value_blk;
4824         struct ocfs2_xattr_entry *xe;
4825         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
4826         size_t blocksize = inode->i_sb->s_blocksize;
4827         struct ocfs2_xattr_value_buf vb = {
4828                 .vb_access = ocfs2_journal_access,
4829         };
4830
4831         xe = &xh->xh_entries[xe_off];
4832
4833         BUG_ON(!xe || ocfs2_xattr_is_local(xe));
4834
4835         offset = le16_to_cpu(xe->xe_name_offset) +
4836                  OCFS2_XATTR_SIZE(xe->xe_name_len);
4837
4838         value_blk = offset / blocksize;
4839
4840         /* We don't allow ocfs2_xattr_value to be stored in different block. */
4841         BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
4842
4843         vb.vb_bh = bucket->bu_bhs[value_blk];
4844         BUG_ON(!vb.vb_bh);
4845
4846         vb.vb_xv = (struct ocfs2_xattr_value_root *)
4847                 (vb.vb_bh->b_data + offset % blocksize);
4848
4849         /*
4850          * From here on out we have to dirty the bucket.  The generic
4851          * value calls only modify one of the bucket's bhs, but we need
4852          * to send the bucket at once.  So if they error, they *could* have
4853          * modified something.  We have to assume they did, and dirty
4854          * the whole bucket.  This leaves us in a consistent state.
4855          */
4856         mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n",
4857              xe_off, (unsigned long long)bucket_blkno(bucket), len);
4858         ret = ocfs2_xattr_value_truncate(inode, &vb, len, ctxt);
4859         if (ret) {
4860                 mlog_errno(ret);
4861                 goto out;
4862         }
4863
4864         ret = ocfs2_xattr_bucket_journal_access(ctxt->handle, bucket,
4865                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4866         if (ret) {
4867                 mlog_errno(ret);
4868                 goto out;
4869         }
4870
4871         xe->xe_value_size = cpu_to_le64(len);
4872
4873         ocfs2_xattr_bucket_journal_dirty(ctxt->handle, bucket);
4874
4875 out:
4876         return ret;
4877 }
4878
4879 static int ocfs2_xattr_bucket_value_truncate_xs(struct inode *inode,
4880                                         struct ocfs2_xattr_search *xs,
4881                                         int len,
4882                                         struct ocfs2_xattr_set_ctxt *ctxt)
4883 {
4884         int ret, offset;
4885         struct ocfs2_xattr_entry *xe = xs->here;
4886         struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xs->base;
4887
4888         BUG_ON(!xs->bucket->bu_bhs[0] || !xe || ocfs2_xattr_is_local(xe));
4889
4890         offset = xe - xh->xh_entries;
4891         ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket,
4892                                                 offset, len, ctxt);
4893         if (ret)
4894                 mlog_errno(ret);
4895
4896         return ret;
4897 }
4898
4899 static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode,
4900                                                 handle_t *handle,
4901                                                 struct ocfs2_xattr_search *xs,
4902                                                 char *val,
4903                                                 int value_len)
4904 {
4905         int ret, offset, block_off;
4906         struct ocfs2_xattr_value_root *xv;
4907         struct ocfs2_xattr_entry *xe = xs->here;
4908         struct ocfs2_xattr_header *xh = bucket_xh(xs->bucket);
4909         void *base;
4910         struct ocfs2_xattr_value_buf vb = {
4911                 .vb_access = ocfs2_journal_access,
4912         };
4913
4914         BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe));
4915
4916         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb, xh,
4917                                                 xe - xh->xh_entries,
4918                                                 &block_off,
4919                                                 &offset);
4920         if (ret) {
4921                 mlog_errno(ret);
4922                 goto out;
4923         }
4924
4925         base = bucket_block(xs->bucket, block_off);
4926         xv = (struct ocfs2_xattr_value_root *)(base + offset +
4927                  OCFS2_XATTR_SIZE(xe->xe_name_len));
4928
4929         vb.vb_xv = xv;
4930         vb.vb_bh = xs->bucket->bu_bhs[block_off];
4931         ret = __ocfs2_xattr_set_value_outside(inode, handle,
4932                                               &vb, val, value_len);
4933         if (ret)
4934                 mlog_errno(ret);
4935 out:
4936         return ret;
4937 }
4938
4939 static int ocfs2_rm_xattr_cluster(struct inode *inode,
4940                                   struct buffer_head *root_bh,
4941                                   u64 blkno,
4942                                   u32 cpos,
4943                                   u32 len,
4944                                   void *para)
4945 {
4946         int ret;
4947         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4948         struct inode *tl_inode = osb->osb_tl_inode;
4949         handle_t *handle;
4950         struct ocfs2_xattr_block *xb =
4951                         (struct ocfs2_xattr_block *)root_bh->b_data;
4952         struct ocfs2_alloc_context *meta_ac = NULL;
4953         struct ocfs2_cached_dealloc_ctxt dealloc;
4954         struct ocfs2_extent_tree et;
4955
4956         ret = ocfs2_iterate_xattr_buckets(inode, blkno, len,
4957                                           ocfs2_delete_xattr_in_bucket, NULL);
4958         if (ret) {
4959                 mlog_errno(ret);
4960                 return ret;
4961         }
4962
4963         ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
4964
4965         ocfs2_init_dealloc_ctxt(&dealloc);
4966
4967         mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n",
4968              cpos, len, (unsigned long long)blkno);
4969
4970         ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode), blkno,
4971                                                len);
4972
4973         ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
4974         if (ret) {
4975                 mlog_errno(ret);
4976                 return ret;
4977         }
4978
4979         mutex_lock(&tl_inode->i_mutex);
4980
4981         if (ocfs2_truncate_log_needs_flush(osb)) {
4982                 ret = __ocfs2_flush_truncate_log(osb);
4983                 if (ret < 0) {
4984                         mlog_errno(ret);
4985                         goto out;
4986                 }
4987         }
4988
4989         handle = ocfs2_start_trans(osb, ocfs2_remove_extent_credits(osb->sb));
4990         if (IS_ERR(handle)) {
4991                 ret = -ENOMEM;
4992                 mlog_errno(ret);
4993                 goto out;
4994         }
4995
4996         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
4997                                       OCFS2_JOURNAL_ACCESS_WRITE);
4998         if (ret) {
4999                 mlog_errno(ret);
5000                 goto out_commit;
5001         }
5002
5003         ret = ocfs2_remove_extent(handle, &et, cpos, len, meta_ac,
5004                                   &dealloc);
5005         if (ret) {
5006                 mlog_errno(ret);
5007                 goto out_commit;
5008         }
5009
5010         le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
5011
5012         ret = ocfs2_journal_dirty(handle, root_bh);
5013         if (ret) {
5014                 mlog_errno(ret);
5015                 goto out_commit;
5016         }
5017
5018         ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
5019         if (ret)
5020                 mlog_errno(ret);
5021
5022 out_commit:
5023         ocfs2_commit_trans(osb, handle);
5024 out:
5025         ocfs2_schedule_truncate_log_flush(osb, 1);
5026
5027         mutex_unlock(&tl_inode->i_mutex);
5028
5029         if (meta_ac)
5030                 ocfs2_free_alloc_context(meta_ac);
5031
5032         ocfs2_run_deallocs(osb, &dealloc);
5033
5034         return ret;
5035 }
5036
5037 static void ocfs2_xattr_bucket_remove_xs(struct inode *inode,
5038                                          handle_t *handle,
5039                                          struct ocfs2_xattr_search *xs)
5040 {
5041         struct ocfs2_xattr_header *xh = bucket_xh(xs->bucket);
5042         struct ocfs2_xattr_entry *last = &xh->xh_entries[
5043                                                 le16_to_cpu(xh->xh_count) - 1];
5044         int ret = 0;
5045
5046         ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
5047                                                 OCFS2_JOURNAL_ACCESS_WRITE);
5048         if (ret) {
5049                 mlog_errno(ret);
5050                 return;
5051         }
5052
5053         /* Remove the old entry. */
5054         memmove(xs->here, xs->here + 1,
5055                 (void *)last - (void *)xs->here);
5056         memset(last, 0, sizeof(struct ocfs2_xattr_entry));
5057         le16_add_cpu(&xh->xh_count, -1);
5058
5059         ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
5060 }
5061
5062 /*
5063  * Set the xattr name/value in the bucket specified in xs.
5064  *
5065  * As the new value in xi may be stored in the bucket or in an outside cluster,
5066  * we divide the whole process into 3 steps:
5067  * 1. insert name/value in the bucket(ocfs2_xattr_set_entry_in_bucket)
5068  * 2. truncate of the outside cluster(ocfs2_xattr_bucket_value_truncate_xs)
5069  * 3. Set the value to the outside cluster(ocfs2_xattr_bucket_set_value_outside)
5070  * 4. If the clusters for the new outside value can't be allocated, we need
5071  *    to free the xattr we allocated in set.
5072  */
5073 static int ocfs2_xattr_set_in_bucket(struct inode *inode,
5074                                      struct ocfs2_xattr_info *xi,
5075                                      struct ocfs2_xattr_search *xs,
5076                                      struct ocfs2_xattr_set_ctxt *ctxt)
5077 {
5078         int ret, local = 1;
5079         size_t value_len;
5080         char *val = (char *)xi->value;
5081         struct ocfs2_xattr_entry *xe = xs->here;
5082         u32 name_hash = ocfs2_xattr_name_hash(inode, xi->name,
5083                                               strlen(xi->name));
5084
5085         if (!xs->not_found && !ocfs2_xattr_is_local(xe)) {
5086                 /*
5087                  * We need to truncate the xattr storage first.
5088                  *
5089                  * If both the old and new value are stored to
5090                  * outside block, we only need to truncate
5091                  * the storage and then set the value outside.
5092                  *
5093                  * If the new value should be stored within block,
5094                  * we should free all the outside block first and
5095                  * the modification to the xattr block will be done
5096                  * by following steps.
5097                  */
5098                 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
5099                         value_len = xi->value_len;
5100                 else
5101                         value_len = 0;
5102
5103                 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
5104                                                            value_len,
5105                                                            ctxt);
5106                 if (ret)
5107                         goto out;
5108
5109                 if (value_len)
5110                         goto set_value_outside;
5111         }
5112
5113         value_len = xi->value_len;
5114         /* So we have to handle the inside block change now. */
5115         if (value_len > OCFS2_XATTR_INLINE_SIZE) {
5116                 /*
5117                  * If the new value will be stored outside of block,
5118                  * initalize a new empty value root and insert it first.
5119                  */
5120                 local = 0;
5121                 xi->value = &def_xv;
5122                 xi->value_len = OCFS2_XATTR_ROOT_SIZE;
5123         }
5124
5125         ret = ocfs2_xattr_set_entry_in_bucket(inode, ctxt->handle, xi, xs,
5126                                               name_hash, local);
5127         if (ret) {
5128                 mlog_errno(ret);
5129                 goto out;
5130         }
5131
5132         if (value_len <= OCFS2_XATTR_INLINE_SIZE)
5133                 goto out;
5134
5135         /* allocate the space now for the outside block storage. */
5136         ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
5137                                                    value_len, ctxt);
5138         if (ret) {
5139                 mlog_errno(ret);
5140
5141                 if (xs->not_found) {
5142                         /*
5143                          * We can't allocate enough clusters for outside
5144                          * storage and we have allocated xattr already,
5145                          * so need to remove it.
5146                          */
5147                         ocfs2_xattr_bucket_remove_xs(inode, ctxt->handle, xs);
5148                 }
5149                 goto out;
5150         }
5151
5152 set_value_outside:
5153         ret = ocfs2_xattr_bucket_set_value_outside(inode, ctxt->handle,
5154                                                    xs, val, value_len);
5155 out:
5156         return ret;
5157 }
5158
5159 /*
5160  * check whether the xattr bucket is filled up with the same hash value.
5161  * If we want to insert the xattr with the same hash, return -ENOSPC.
5162  * If we want to insert a xattr with different hash value, go ahead
5163  * and ocfs2_divide_xattr_bucket will handle this.
5164  */
5165 static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
5166                                               struct ocfs2_xattr_bucket *bucket,
5167                                               const char *name)
5168 {
5169         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5170         u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
5171
5172         if (name_hash != le32_to_cpu(xh->xh_entries[0].xe_name_hash))
5173                 return 0;
5174
5175         if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
5176             xh->xh_entries[0].xe_name_hash) {
5177                 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
5178                      "hash = %u\n",
5179                      (unsigned long long)bucket_blkno(bucket),
5180                      le32_to_cpu(xh->xh_entries[0].xe_name_hash));
5181                 return -ENOSPC;
5182         }
5183
5184         return 0;
5185 }
5186
5187 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
5188                                              struct ocfs2_xattr_info *xi,
5189                                              struct ocfs2_xattr_search *xs,
5190                                              struct ocfs2_xattr_set_ctxt *ctxt)
5191 {
5192         struct ocfs2_xattr_header *xh;
5193         struct ocfs2_xattr_entry *xe;
5194         u16 count, header_size, xh_free_start;
5195         int free, max_free, need, old;
5196         size_t value_size = 0, name_len = strlen(xi->name);
5197         size_t blocksize = inode->i_sb->s_blocksize;
5198         int ret, allocation = 0;
5199
5200         mlog_entry("Set xattr %s in xattr index block\n", xi->name);
5201
5202 try_again:
5203         xh = xs->header;
5204         count = le16_to_cpu(xh->xh_count);
5205         xh_free_start = le16_to_cpu(xh->xh_free_start);
5206         header_size = sizeof(struct ocfs2_xattr_header) +
5207                         count * sizeof(struct ocfs2_xattr_entry);
5208         max_free = OCFS2_XATTR_BUCKET_SIZE - header_size -
5209                 le16_to_cpu(xh->xh_name_value_len) - OCFS2_XATTR_HEADER_GAP;
5210
5211         mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size "
5212                         "of %u which exceed block size\n",
5213                         (unsigned long long)bucket_blkno(xs->bucket),
5214                         header_size);
5215
5216         if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE)
5217                 value_size = OCFS2_XATTR_ROOT_SIZE;
5218         else if (xi->value)
5219                 value_size = OCFS2_XATTR_SIZE(xi->value_len);
5220
5221         if (xs->not_found)
5222                 need = sizeof(struct ocfs2_xattr_entry) +
5223                         OCFS2_XATTR_SIZE(name_len) + value_size;
5224         else {
5225                 need = value_size + OCFS2_XATTR_SIZE(name_len);
5226
5227                 /*
5228                  * We only replace the old value if the new length is smaller
5229                  * than the old one. Otherwise we will allocate new space in the
5230                  * bucket to store it.
5231                  */
5232                 xe = xs->here;
5233                 if (ocfs2_xattr_is_local(xe))
5234                         old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
5235                 else
5236                         old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
5237
5238                 if (old >= value_size)
5239                         need = 0;
5240         }
5241
5242         free = xh_free_start - header_size - OCFS2_XATTR_HEADER_GAP;
5243         /*
5244          * We need to make sure the new name/value pair
5245          * can exist in the same block.
5246          */
5247         if (xh_free_start % blocksize < need)
5248                 free -= xh_free_start % blocksize;
5249
5250         mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, "
5251              "need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len ="
5252              " %u\n", xs->not_found,
5253              (unsigned long long)bucket_blkno(xs->bucket),
5254              free, need, max_free, le16_to_cpu(xh->xh_free_start),
5255              le16_to_cpu(xh->xh_name_value_len));
5256
5257         if (free < need ||
5258             (xs->not_found &&
5259              count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb))) {
5260                 if (need <= max_free &&
5261                     count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
5262                         /*
5263                          * We can create the space by defragment. Since only the
5264                          * name/value will be moved, the xe shouldn't be changed
5265                          * in xs.
5266                          */
5267                         ret = ocfs2_defrag_xattr_bucket(inode, ctxt->handle,
5268                                                         xs->bucket);
5269                         if (ret) {
5270                                 mlog_errno(ret);
5271                                 goto out;
5272                         }
5273
5274                         xh_free_start = le16_to_cpu(xh->xh_free_start);
5275                         free = xh_free_start - header_size
5276                                 - OCFS2_XATTR_HEADER_GAP;
5277                         if (xh_free_start % blocksize < need)
5278                                 free -= xh_free_start % blocksize;
5279
5280                         if (free >= need)
5281                                 goto xattr_set;
5282
5283                         mlog(0, "Can't get enough space for xattr insert by "
5284                              "defragment. Need %u bytes, but we have %d, so "
5285                              "allocate new bucket for it.\n", need, free);
5286                 }
5287
5288                 /*
5289                  * We have to add new buckets or clusters and one
5290                  * allocation should leave us enough space for insert.
5291                  */
5292                 BUG_ON(allocation);
5293
5294                 /*
5295                  * We do not allow for overlapping ranges between buckets. And
5296                  * the maximum number of collisions we will allow for then is
5297                  * one bucket's worth, so check it here whether we need to
5298                  * add a new bucket for the insert.
5299                  */
5300                 ret = ocfs2_check_xattr_bucket_collision(inode,
5301                                                          xs->bucket,
5302                                                          xi->name);
5303                 if (ret) {
5304                         mlog_errno(ret);
5305                         goto out;
5306                 }
5307
5308                 ret = ocfs2_add_new_xattr_bucket(inode,
5309                                                  xs->xattr_bh,
5310                                                  xs->bucket,
5311                                                  ctxt);
5312                 if (ret) {
5313                         mlog_errno(ret);
5314                         goto out;
5315                 }
5316
5317                 /*
5318                  * ocfs2_add_new_xattr_bucket() will have updated
5319                  * xs->bucket if it moved, but it will not have updated
5320                  * any of the other search fields.  Thus, we drop it and
5321                  * re-search.  Everything should be cached, so it'll be
5322                  * quick.
5323                  */
5324                 ocfs2_xattr_bucket_relse(xs->bucket);
5325                 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
5326                                                    xi->name_index,
5327                                                    xi->name, xs);
5328                 if (ret && ret != -ENODATA)
5329                         goto out;
5330                 xs->not_found = ret;
5331                 allocation = 1;
5332                 goto try_again;
5333         }
5334
5335 xattr_set:
5336         ret = ocfs2_xattr_set_in_bucket(inode, xi, xs, ctxt);
5337 out:
5338         mlog_exit(ret);
5339         return ret;
5340 }
5341
5342 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
5343                                         struct ocfs2_xattr_bucket *bucket,
5344                                         void *para)
5345 {
5346         int ret = 0;
5347         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5348         u16 i;
5349         struct ocfs2_xattr_entry *xe;
5350         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5351         struct ocfs2_xattr_set_ctxt ctxt = {NULL, NULL,};
5352         int credits = ocfs2_remove_extent_credits(osb->sb) +
5353                 ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5354
5355
5356         ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
5357
5358         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
5359                 xe = &xh->xh_entries[i];
5360                 if (ocfs2_xattr_is_local(xe))
5361                         continue;
5362
5363                 ctxt.handle = ocfs2_start_trans(osb, credits);
5364                 if (IS_ERR(ctxt.handle)) {
5365                         ret = PTR_ERR(ctxt.handle);
5366                         mlog_errno(ret);
5367                         break;
5368                 }
5369
5370                 ret = ocfs2_xattr_bucket_value_truncate(inode, bucket,
5371                                                         i, 0, &ctxt);
5372
5373                 ocfs2_commit_trans(osb, ctxt.handle);
5374                 if (ret) {
5375                         mlog_errno(ret);
5376                         break;
5377                 }
5378         }
5379
5380         ocfs2_schedule_truncate_log_flush(osb, 1);
5381         ocfs2_run_deallocs(osb, &ctxt.dealloc);
5382         return ret;
5383 }
5384
5385 /*
5386  * Whenever we modify a xattr value root in the bucket(e.g, CoW
5387  * or change the extent record flag), we need to recalculate
5388  * the metaecc for the whole bucket. So it is done here.
5389  *
5390  * Note:
5391  * We have to give the extra credits for the caller.
5392  */
5393 static int ocfs2_xattr_bucket_post_refcount(struct inode *inode,
5394                                             handle_t *handle,
5395                                             void *para)
5396 {
5397         int ret;
5398         struct ocfs2_xattr_bucket *bucket =
5399                         (struct ocfs2_xattr_bucket *)para;
5400
5401         ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
5402                                                 OCFS2_JOURNAL_ACCESS_WRITE);
5403         if (ret) {
5404                 mlog_errno(ret);
5405                 return ret;
5406         }
5407
5408         ocfs2_xattr_bucket_journal_dirty(handle, bucket);
5409
5410         return 0;
5411 }
5412
5413 /*
5414  * Special action we need if the xattr value is refcounted.
5415  *
5416  * 1. If the xattr is refcounted, lock the tree.
5417  * 2. CoW the xattr if we are setting the new value and the value
5418  *    will be stored outside.
5419  * 3. In other case, decrease_refcount will work for us, so just
5420  *    lock the refcount tree, calculate the meta and credits is OK.
5421  *
5422  * We have to do CoW before ocfs2_init_xattr_set_ctxt since
5423  * currently CoW is a completed transaction, while this function
5424  * will also lock the allocators and let us deadlock. So we will
5425  * CoW the whole xattr value.
5426  */
5427 static int ocfs2_prepare_refcount_xattr(struct inode *inode,
5428                                         struct ocfs2_dinode *di,
5429                                         struct ocfs2_xattr_info *xi,
5430                                         struct ocfs2_xattr_search *xis,
5431                                         struct ocfs2_xattr_search *xbs,
5432                                         struct ocfs2_refcount_tree **ref_tree,
5433                                         int *meta_add,
5434                                         int *credits)
5435 {
5436         int ret = 0;
5437         struct ocfs2_xattr_block *xb;
5438         struct ocfs2_xattr_entry *xe;
5439         char *base;
5440         u32 p_cluster, num_clusters;
5441         unsigned int ext_flags;
5442         int name_offset, name_len;
5443         struct ocfs2_xattr_value_buf vb;
5444         struct ocfs2_xattr_bucket *bucket = NULL;
5445         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5446         struct ocfs2_post_refcount refcount;
5447         struct ocfs2_post_refcount *p = NULL;
5448         struct buffer_head *ref_root_bh = NULL;
5449
5450         if (!xis->not_found) {
5451                 xe = xis->here;
5452                 name_offset = le16_to_cpu(xe->xe_name_offset);
5453                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5454                 base = xis->base;
5455                 vb.vb_bh = xis->inode_bh;
5456                 v