1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
6 * Copyright (C) 2008 Oracle. All rights reserved.
9 * Lots of code in this file is taken from ext3.
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public
13 * License as published by the Free Software Foundation; either
14 * version 2 of the License, or (at your option) any later version.
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.
21 * You should have received a copy of the GNU General Public
22 * License along with this program; if not, write to the
23 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24 * Boston, MA 021110-1307, USA.
27 #include <linux/capability.h>
29 #include <linux/types.h>
30 #include <linux/slab.h>
31 #include <linux/highmem.h>
32 #include <linux/pagemap.h>
33 #include <linux/uio.h>
34 #include <linux/sched.h>
35 #include <linux/splice.h>
36 #include <linux/mount.h>
37 #include <linux/writeback.h>
38 #include <linux/falloc.h>
39 #include <linux/sort.h>
40 #include <linux/init.h>
41 #include <linux/module.h>
42 #include <linux/string.h>
44 #define MLOG_MASK_PREFIX ML_XATTR
45 #include <cluster/masklog.h>
58 #include "buffer_head_io.h"
63 struct ocfs2_xattr_def_value_root {
64 struct ocfs2_xattr_value_root xv;
65 struct ocfs2_extent_rec er;
68 struct ocfs2_xattr_bucket {
69 struct buffer_head *bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET];
70 struct ocfs2_xattr_header *xh;
73 #define OCFS2_XATTR_ROOT_SIZE (sizeof(struct ocfs2_xattr_def_value_root))
74 #define OCFS2_XATTR_INLINE_SIZE 80
76 static struct ocfs2_xattr_def_value_root def_xv = {
77 .xv.xr_list.l_count = cpu_to_le16(1),
80 struct xattr_handler *ocfs2_xattr_handlers[] = {
81 &ocfs2_xattr_user_handler,
82 &ocfs2_xattr_trusted_handler,
86 static struct xattr_handler *ocfs2_xattr_handler_map[] = {
87 [OCFS2_XATTR_INDEX_USER] = &ocfs2_xattr_user_handler,
88 [OCFS2_XATTR_INDEX_TRUSTED] = &ocfs2_xattr_trusted_handler,
91 struct ocfs2_xattr_info {
98 struct ocfs2_xattr_search {
99 struct buffer_head *inode_bh;
101 * xattr_bh point to the block buffer head which has extended attribute
102 * when extended attribute in inode, xattr_bh is equal to inode_bh.
104 struct buffer_head *xattr_bh;
105 struct ocfs2_xattr_header *header;
106 struct ocfs2_xattr_bucket bucket;
109 struct ocfs2_xattr_entry *here;
113 static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
114 struct ocfs2_xattr_header *xh,
119 static int ocfs2_xattr_index_block_find(struct inode *inode,
120 struct buffer_head *root_bh,
123 struct ocfs2_xattr_search *xs);
125 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
126 struct ocfs2_xattr_tree_root *xt,
130 static int ocfs2_xattr_create_index_block(struct inode *inode,
131 struct ocfs2_xattr_search *xs);
133 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
134 struct ocfs2_xattr_info *xi,
135 struct ocfs2_xattr_search *xs);
137 static int ocfs2_delete_xattr_index_block(struct inode *inode,
138 struct buffer_head *xb_bh);
140 static inline struct xattr_handler *ocfs2_xattr_handler(int name_index)
142 struct xattr_handler *handler = NULL;
144 if (name_index > 0 && name_index < OCFS2_XATTR_MAX)
145 handler = ocfs2_xattr_handler_map[name_index];
150 static u32 ocfs2_xattr_name_hash(struct inode *inode,
156 /* Get hash value of uuid from super block */
157 u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash;
160 /* hash extended attribute prefix */
161 for (i = 0; i < prefix_len; i++) {
162 hash = (hash << OCFS2_HASH_SHIFT) ^
163 (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
166 /* hash extended attribute name */
167 for (i = 0; i < name_len; i++) {
168 hash = (hash << OCFS2_HASH_SHIFT) ^
169 (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
177 * ocfs2_xattr_hash_entry()
179 * Compute the hash of an extended attribute.
181 static void ocfs2_xattr_hash_entry(struct inode *inode,
182 struct ocfs2_xattr_header *header,
183 struct ocfs2_xattr_entry *entry)
186 struct xattr_handler *handler =
187 ocfs2_xattr_handler(ocfs2_xattr_get_type(entry));
188 char *prefix = handler->prefix;
189 char *name = (char *)header + le16_to_cpu(entry->xe_name_offset);
190 int prefix_len = strlen(handler->prefix);
192 hash = ocfs2_xattr_name_hash(inode, prefix, prefix_len, name,
194 entry->xe_name_hash = cpu_to_le32(hash);
199 static int ocfs2_xattr_extend_allocation(struct inode *inode,
201 struct buffer_head *xattr_bh,
202 struct ocfs2_xattr_value_root *xv)
205 int restart_func = 0;
207 handle_t *handle = NULL;
208 struct ocfs2_alloc_context *data_ac = NULL;
209 struct ocfs2_alloc_context *meta_ac = NULL;
210 enum ocfs2_alloc_restarted why;
211 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
212 u32 prev_clusters, logical_start = le32_to_cpu(xv->xr_clusters);
213 struct ocfs2_extent_tree et;
215 mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add);
217 ocfs2_init_xattr_value_extent_tree(&et, inode, xattr_bh, xv);
221 status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
228 credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el,
230 handle = ocfs2_start_trans(osb, credits);
231 if (IS_ERR(handle)) {
232 status = PTR_ERR(handle);
238 restarted_transaction:
239 status = ocfs2_journal_access(handle, inode, xattr_bh,
240 OCFS2_JOURNAL_ACCESS_WRITE);
246 prev_clusters = le32_to_cpu(xv->xr_clusters);
247 status = ocfs2_add_clusters_in_btree(osb,
257 if ((status < 0) && (status != -EAGAIN)) {
258 if (status != -ENOSPC)
263 status = ocfs2_journal_dirty(handle, xattr_bh);
269 clusters_to_add -= le32_to_cpu(xv->xr_clusters) - prev_clusters;
271 if (why != RESTART_NONE && clusters_to_add) {
272 if (why == RESTART_META) {
273 mlog(0, "restarting function.\n");
276 BUG_ON(why != RESTART_TRANS);
278 mlog(0, "restarting transaction.\n");
279 /* TODO: This can be more intelligent. */
280 credits = ocfs2_calc_extend_credits(osb->sb,
283 status = ocfs2_extend_trans(handle, credits);
285 /* handle still has to be committed at
291 goto restarted_transaction;
297 ocfs2_commit_trans(osb, handle);
301 ocfs2_free_alloc_context(data_ac);
305 ocfs2_free_alloc_context(meta_ac);
308 if ((!status) && restart_func) {
316 static int __ocfs2_remove_xattr_range(struct inode *inode,
317 struct buffer_head *root_bh,
318 struct ocfs2_xattr_value_root *xv,
319 u32 cpos, u32 phys_cpos, u32 len,
320 struct ocfs2_cached_dealloc_ctxt *dealloc)
323 u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
324 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
325 struct inode *tl_inode = osb->osb_tl_inode;
327 struct ocfs2_alloc_context *meta_ac = NULL;
328 struct ocfs2_extent_tree et;
330 ocfs2_init_xattr_value_extent_tree(&et, inode, root_bh, xv);
332 ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
338 mutex_lock(&tl_inode->i_mutex);
340 if (ocfs2_truncate_log_needs_flush(osb)) {
341 ret = __ocfs2_flush_truncate_log(osb);
348 handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
349 if (IS_ERR(handle)) {
350 ret = PTR_ERR(handle);
355 ret = ocfs2_journal_access(handle, inode, root_bh,
356 OCFS2_JOURNAL_ACCESS_WRITE);
362 ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
369 le32_add_cpu(&xv->xr_clusters, -len);
371 ret = ocfs2_journal_dirty(handle, root_bh);
377 ret = ocfs2_truncate_log_append(osb, handle, phys_blkno, len);
382 ocfs2_commit_trans(osb, handle);
384 mutex_unlock(&tl_inode->i_mutex);
387 ocfs2_free_alloc_context(meta_ac);
392 static int ocfs2_xattr_shrink_size(struct inode *inode,
395 struct buffer_head *root_bh,
396 struct ocfs2_xattr_value_root *xv)
399 u32 trunc_len, cpos, phys_cpos, alloc_size;
401 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
402 struct ocfs2_cached_dealloc_ctxt dealloc;
404 ocfs2_init_dealloc_ctxt(&dealloc);
406 if (old_clusters <= new_clusters)
410 trunc_len = old_clusters - new_clusters;
412 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
413 &alloc_size, &xv->xr_list);
419 if (alloc_size > trunc_len)
420 alloc_size = trunc_len;
422 ret = __ocfs2_remove_xattr_range(inode, root_bh, xv, cpos,
423 phys_cpos, alloc_size,
430 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
431 ocfs2_remove_xattr_clusters_from_cache(inode, block,
434 trunc_len -= alloc_size;
438 ocfs2_schedule_truncate_log_flush(osb, 1);
439 ocfs2_run_deallocs(osb, &dealloc);
444 static int ocfs2_xattr_value_truncate(struct inode *inode,
445 struct buffer_head *root_bh,
446 struct ocfs2_xattr_value_root *xv,
450 u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
451 u32 old_clusters = le32_to_cpu(xv->xr_clusters);
453 if (new_clusters == old_clusters)
456 if (new_clusters > old_clusters)
457 ret = ocfs2_xattr_extend_allocation(inode,
458 new_clusters - old_clusters,
461 ret = ocfs2_xattr_shrink_size(inode,
462 old_clusters, new_clusters,
468 static int ocfs2_xattr_list_entries(struct inode *inode,
469 struct ocfs2_xattr_header *header,
470 char *buffer, size_t buffer_size)
472 size_t rest = buffer_size;
475 for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
476 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
477 struct xattr_handler *handler =
478 ocfs2_xattr_handler(ocfs2_xattr_get_type(entry));
481 size_t size = handler->list(inode, buffer, rest,
483 le16_to_cpu(entry->xe_name_offset)),
494 return buffer_size - rest;
497 static int ocfs2_xattr_ibody_list(struct inode *inode,
498 struct ocfs2_dinode *di,
502 struct ocfs2_xattr_header *header = NULL;
503 struct ocfs2_inode_info *oi = OCFS2_I(inode);
506 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
509 header = (struct ocfs2_xattr_header *)
510 ((void *)di + inode->i_sb->s_blocksize -
511 le16_to_cpu(di->i_xattr_inline_size));
513 ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size);
518 static int ocfs2_xattr_block_list(struct inode *inode,
519 struct ocfs2_dinode *di,
523 struct buffer_head *blk_bh = NULL;
524 struct ocfs2_xattr_block *xb;
527 if (!di->i_xattr_loc)
530 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
531 le64_to_cpu(di->i_xattr_loc),
532 &blk_bh, OCFS2_BH_CACHED, inode);
537 /*Verify the signature of xattr block*/
538 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
539 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
544 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
546 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
547 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
548 ret = ocfs2_xattr_list_entries(inode, header,
549 buffer, buffer_size);
551 struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root;
552 ret = ocfs2_xattr_tree_list_index_block(inode, xt,
553 buffer, buffer_size);
561 ssize_t ocfs2_listxattr(struct dentry *dentry,
565 int ret = 0, i_ret = 0, b_ret = 0;
566 struct buffer_head *di_bh = NULL;
567 struct ocfs2_dinode *di = NULL;
568 struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode);
570 if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
573 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
576 ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0);
582 di = (struct ocfs2_dinode *)di_bh->b_data;
584 down_read(&oi->ip_xattr_sem);
585 i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size);
593 b_ret = ocfs2_xattr_block_list(dentry->d_inode, di,
598 up_read(&oi->ip_xattr_sem);
599 ocfs2_inode_unlock(dentry->d_inode, 0);
603 return i_ret + b_ret;
606 static int ocfs2_xattr_find_entry(int name_index,
608 struct ocfs2_xattr_search *xs)
610 struct ocfs2_xattr_entry *entry;
617 name_len = strlen(name);
619 for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
620 cmp = name_index - ocfs2_xattr_get_type(entry);
622 cmp = name_len - entry->xe_name_len;
624 cmp = memcmp(name, (xs->base +
625 le16_to_cpu(entry->xe_name_offset)),
633 return cmp ? -ENODATA : 0;
636 static int ocfs2_xattr_get_value_outside(struct inode *inode,
637 struct ocfs2_xattr_value_root *xv,
641 u32 cpos, p_cluster, num_clusters, bpc, clusters;
644 size_t cplen, blocksize;
645 struct buffer_head *bh = NULL;
646 struct ocfs2_extent_list *el;
649 clusters = le32_to_cpu(xv->xr_clusters);
650 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
651 blocksize = inode->i_sb->s_blocksize;
654 while (cpos < clusters) {
655 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
662 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
663 /* Copy ocfs2_xattr_value */
664 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
665 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno,
666 &bh, OCFS2_BH_CACHED, inode);
672 cplen = len >= blocksize ? blocksize : len;
673 memcpy(buffer, bh->b_data, cplen);
682 cpos += num_clusters;
688 static int ocfs2_xattr_ibody_get(struct inode *inode,
693 struct ocfs2_xattr_search *xs)
695 struct ocfs2_inode_info *oi = OCFS2_I(inode);
696 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
697 struct ocfs2_xattr_value_root *xv;
701 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
704 xs->end = (void *)di + inode->i_sb->s_blocksize;
705 xs->header = (struct ocfs2_xattr_header *)
706 (xs->end - le16_to_cpu(di->i_xattr_inline_size));
707 xs->base = (void *)xs->header;
708 xs->here = xs->header->xh_entries;
710 ret = ocfs2_xattr_find_entry(name_index, name, xs);
713 size = le64_to_cpu(xs->here->xe_value_size);
715 if (size > buffer_size)
717 if (ocfs2_xattr_is_local(xs->here)) {
718 memcpy(buffer, (void *)xs->base +
719 le16_to_cpu(xs->here->xe_name_offset) +
720 OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
722 xv = (struct ocfs2_xattr_value_root *)
723 (xs->base + le16_to_cpu(
724 xs->here->xe_name_offset) +
725 OCFS2_XATTR_SIZE(xs->here->xe_name_len));
726 ret = ocfs2_xattr_get_value_outside(inode, xv,
738 static int ocfs2_xattr_block_get(struct inode *inode,
743 struct ocfs2_xattr_search *xs)
745 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
746 struct buffer_head *blk_bh = NULL;
747 struct ocfs2_xattr_block *xb;
748 struct ocfs2_xattr_value_root *xv;
750 int ret = -ENODATA, name_offset, name_len, block_off, i;
752 if (!di->i_xattr_loc)
755 memset(&xs->bucket, 0, sizeof(xs->bucket));
757 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
758 le64_to_cpu(di->i_xattr_loc),
759 &blk_bh, OCFS2_BH_CACHED, inode);
764 /*Verify the signature of xattr block*/
765 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
766 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
771 xs->xattr_bh = blk_bh;
772 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
774 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
775 xs->header = &xb->xb_attrs.xb_header;
776 xs->base = (void *)xs->header;
777 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
778 xs->here = xs->header->xh_entries;
780 ret = ocfs2_xattr_find_entry(name_index, name, xs);
782 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
788 size = le64_to_cpu(xs->here->xe_value_size);
791 if (size > buffer_size)
794 name_offset = le16_to_cpu(xs->here->xe_name_offset);
795 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
796 i = xs->here - xs->header->xh_entries;
798 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
799 ret = ocfs2_xattr_bucket_get_name_value(inode,
804 xs->base = xs->bucket.bhs[block_off]->b_data;
806 if (ocfs2_xattr_is_local(xs->here)) {
807 memcpy(buffer, (void *)xs->base +
808 name_offset + name_len, size);
810 xv = (struct ocfs2_xattr_value_root *)
811 (xs->base + name_offset + name_len);
812 ret = ocfs2_xattr_get_value_outside(inode, xv,
822 for (i = 0; i < OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET; i++)
823 brelse(xs->bucket.bhs[i]);
824 memset(&xs->bucket, 0, sizeof(xs->bucket));
832 * Copy an extended attribute into the buffer provided.
833 * Buffer is NULL to compute the size of buffer required.
835 int ocfs2_xattr_get(struct inode *inode,
842 struct ocfs2_dinode *di = NULL;
843 struct buffer_head *di_bh = NULL;
844 struct ocfs2_inode_info *oi = OCFS2_I(inode);
845 struct ocfs2_xattr_search xis = {
846 .not_found = -ENODATA,
848 struct ocfs2_xattr_search xbs = {
849 .not_found = -ENODATA,
852 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
855 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
858 ret = ocfs2_inode_lock(inode, &di_bh, 0);
863 xis.inode_bh = xbs.inode_bh = di_bh;
864 di = (struct ocfs2_dinode *)di_bh->b_data;
866 down_read(&oi->ip_xattr_sem);
867 ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
870 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
872 up_read(&oi->ip_xattr_sem);
873 ocfs2_inode_unlock(inode, 0);
880 static int __ocfs2_xattr_set_value_outside(struct inode *inode,
881 struct ocfs2_xattr_value_root *xv,
885 int ret = 0, i, cp_len, credits;
886 u16 blocksize = inode->i_sb->s_blocksize;
887 u32 p_cluster, num_clusters;
888 u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
889 u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
891 struct buffer_head *bh = NULL;
894 BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
896 credits = clusters * bpc;
897 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), credits);
898 if (IS_ERR(handle)) {
899 ret = PTR_ERR(handle);
904 while (cpos < clusters) {
905 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
906 &num_clusters, &xv->xr_list);
912 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
914 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
915 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno,
916 &bh, OCFS2_BH_CACHED, inode);
922 ret = ocfs2_journal_access(handle,
925 OCFS2_JOURNAL_ACCESS_WRITE);
931 cp_len = value_len > blocksize ? blocksize : value_len;
932 memcpy(bh->b_data, value, cp_len);
935 if (cp_len < blocksize)
936 memset(bh->b_data + cp_len, 0,
939 ret = ocfs2_journal_dirty(handle, bh);
948 * XXX: do we need to empty all the following
949 * blocks in this cluster?
954 cpos += num_clusters;
957 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
964 static int ocfs2_xattr_cleanup(struct inode *inode,
965 struct ocfs2_xattr_info *xi,
966 struct ocfs2_xattr_search *xs,
969 handle_t *handle = NULL;
971 size_t name_len = strlen(xi->name);
972 void *val = xs->base + offs;
973 size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
975 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
976 OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
977 if (IS_ERR(handle)) {
978 ret = PTR_ERR(handle);
982 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
983 OCFS2_JOURNAL_ACCESS_WRITE);
988 /* Decrease xattr count */
989 le16_add_cpu(&xs->header->xh_count, -1);
990 /* Remove the xattr entry and tree root which has already be set*/
991 memset((void *)xs->here, 0, sizeof(struct ocfs2_xattr_entry));
992 memset(val, 0, size);
994 ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
998 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1003 static int ocfs2_xattr_update_entry(struct inode *inode,
1004 struct ocfs2_xattr_info *xi,
1005 struct ocfs2_xattr_search *xs,
1008 handle_t *handle = NULL;
1011 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1012 OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
1013 if (IS_ERR(handle)) {
1014 ret = PTR_ERR(handle);
1018 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1019 OCFS2_JOURNAL_ACCESS_WRITE);
1025 xs->here->xe_name_offset = cpu_to_le16(offs);
1026 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1027 if (xi->value_len <= OCFS2_XATTR_INLINE_SIZE)
1028 ocfs2_xattr_set_local(xs->here, 1);
1030 ocfs2_xattr_set_local(xs->here, 0);
1031 ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1033 ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
1037 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1043 * ocfs2_xattr_set_value_outside()
1045 * Set large size value in B tree.
1047 static int ocfs2_xattr_set_value_outside(struct inode *inode,
1048 struct ocfs2_xattr_info *xi,
1049 struct ocfs2_xattr_search *xs,
1052 size_t name_len = strlen(xi->name);
1053 void *val = xs->base + offs;
1054 struct ocfs2_xattr_value_root *xv = NULL;
1055 size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1058 memset(val, 0, size);
1059 memcpy(val, xi->name, name_len);
1060 xv = (struct ocfs2_xattr_value_root *)
1061 (val + OCFS2_XATTR_SIZE(name_len));
1062 xv->xr_clusters = 0;
1063 xv->xr_last_eb_blk = 0;
1064 xv->xr_list.l_tree_depth = 0;
1065 xv->xr_list.l_count = cpu_to_le16(1);
1066 xv->xr_list.l_next_free_rec = 0;
1068 ret = ocfs2_xattr_value_truncate(inode, xs->xattr_bh, xv,
1074 ret = __ocfs2_xattr_set_value_outside(inode, xv, xi->value,
1080 ret = ocfs2_xattr_update_entry(inode, xi, xs, offs);
1088 * ocfs2_xattr_set_entry_local()
1090 * Set, replace or remove extended attribute in local.
1092 static void ocfs2_xattr_set_entry_local(struct inode *inode,
1093 struct ocfs2_xattr_info *xi,
1094 struct ocfs2_xattr_search *xs,
1095 struct ocfs2_xattr_entry *last,
1098 size_t name_len = strlen(xi->name);
1101 if (xi->value && xs->not_found) {
1102 /* Insert the new xattr entry. */
1103 le16_add_cpu(&xs->header->xh_count, 1);
1104 ocfs2_xattr_set_type(last, xi->name_index);
1105 ocfs2_xattr_set_local(last, 1);
1106 last->xe_name_len = name_len;
1112 first_val = xs->base + min_offs;
1113 offs = le16_to_cpu(xs->here->xe_name_offset);
1114 val = xs->base + offs;
1116 if (le64_to_cpu(xs->here->xe_value_size) >
1117 OCFS2_XATTR_INLINE_SIZE)
1118 size = OCFS2_XATTR_SIZE(name_len) +
1119 OCFS2_XATTR_ROOT_SIZE;
1121 size = OCFS2_XATTR_SIZE(name_len) +
1122 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1124 if (xi->value && size == OCFS2_XATTR_SIZE(name_len) +
1125 OCFS2_XATTR_SIZE(xi->value_len)) {
1126 /* The old and the new value have the
1127 same size. Just replace the value. */
1128 ocfs2_xattr_set_local(xs->here, 1);
1129 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1130 /* Clear value bytes. */
1131 memset(val + OCFS2_XATTR_SIZE(name_len),
1133 OCFS2_XATTR_SIZE(xi->value_len));
1134 memcpy(val + OCFS2_XATTR_SIZE(name_len),
1139 /* Remove the old name+value. */
1140 memmove(first_val + size, first_val, val - first_val);
1141 memset(first_val, 0, size);
1142 xs->here->xe_name_hash = 0;
1143 xs->here->xe_name_offset = 0;
1144 ocfs2_xattr_set_local(xs->here, 1);
1145 xs->here->xe_value_size = 0;
1149 /* Adjust all value offsets. */
1150 last = xs->header->xh_entries;
1151 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1152 size_t o = le16_to_cpu(last->xe_name_offset);
1155 last->xe_name_offset = cpu_to_le16(o + size);
1160 /* Remove the old entry. */
1162 memmove(xs->here, xs->here + 1,
1163 (void *)last - (void *)xs->here);
1164 memset(last, 0, sizeof(struct ocfs2_xattr_entry));
1165 le16_add_cpu(&xs->header->xh_count, -1);
1169 /* Insert the new name+value. */
1170 size_t size = OCFS2_XATTR_SIZE(name_len) +
1171 OCFS2_XATTR_SIZE(xi->value_len);
1172 void *val = xs->base + min_offs - size;
1174 xs->here->xe_name_offset = cpu_to_le16(min_offs - size);
1175 memset(val, 0, size);
1176 memcpy(val, xi->name, name_len);
1177 memcpy(val + OCFS2_XATTR_SIZE(name_len),
1180 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1181 ocfs2_xattr_set_local(xs->here, 1);
1182 ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1189 * ocfs2_xattr_set_entry()
1191 * Set extended attribute entry into inode or block.
1193 * If extended attribute value size > OCFS2_XATTR_INLINE_SIZE,
1194 * We first insert tree root(ocfs2_xattr_value_root) with set_entry_local(),
1195 * then set value in B tree with set_value_outside().
1197 static int ocfs2_xattr_set_entry(struct inode *inode,
1198 struct ocfs2_xattr_info *xi,
1199 struct ocfs2_xattr_search *xs,
1202 struct ocfs2_xattr_entry *last;
1203 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1204 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1205 size_t min_offs = xs->end - xs->base, name_len = strlen(xi->name);
1207 handle_t *handle = NULL;
1209 struct ocfs2_xattr_info xi_l = {
1210 .name_index = xi->name_index,
1213 .value_len = xi->value_len,
1216 /* Compute min_offs, last and free space. */
1217 last = xs->header->xh_entries;
1219 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1220 size_t offs = le16_to_cpu(last->xe_name_offset);
1221 if (offs < min_offs)
1226 free = min_offs - ((void *)last - xs->base) - sizeof(__u32);
1230 if (!xs->not_found) {
1232 if (ocfs2_xattr_is_local(xs->here))
1233 size = OCFS2_XATTR_SIZE(name_len) +
1234 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1236 size = OCFS2_XATTR_SIZE(name_len) +
1237 OCFS2_XATTR_ROOT_SIZE;
1238 free += (size + sizeof(struct ocfs2_xattr_entry));
1240 /* Check free space in inode or block */
1241 if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1242 if (free < sizeof(struct ocfs2_xattr_entry) +
1243 OCFS2_XATTR_SIZE(name_len) +
1244 OCFS2_XATTR_ROOT_SIZE) {
1248 size_l = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1249 xi_l.value = (void *)&def_xv;
1250 xi_l.value_len = OCFS2_XATTR_ROOT_SIZE;
1251 } else if (xi->value) {
1252 if (free < sizeof(struct ocfs2_xattr_entry) +
1253 OCFS2_XATTR_SIZE(name_len) +
1254 OCFS2_XATTR_SIZE(xi->value_len)) {
1260 if (!xs->not_found) {
1261 /* For existing extended attribute */
1262 size_t size = OCFS2_XATTR_SIZE(name_len) +
1263 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1264 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1265 void *val = xs->base + offs;
1267 if (ocfs2_xattr_is_local(xs->here) && size == size_l) {
1268 /* Replace existing local xattr with tree root */
1269 ret = ocfs2_xattr_set_value_outside(inode, xi, xs,
1274 } else if (!ocfs2_xattr_is_local(xs->here)) {
1275 /* For existing xattr which has value outside */
1276 struct ocfs2_xattr_value_root *xv = NULL;
1277 xv = (struct ocfs2_xattr_value_root *)(val +
1278 OCFS2_XATTR_SIZE(name_len));
1280 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1282 * If new value need set outside also,
1283 * first truncate old value to new value,
1284 * then set new value with set_value_outside().
1286 ret = ocfs2_xattr_value_truncate(inode,
1295 ret = __ocfs2_xattr_set_value_outside(inode,
1304 ret = ocfs2_xattr_update_entry(inode,
1313 * If new value need set in local,
1314 * just trucate old value to zero.
1316 ret = ocfs2_xattr_value_truncate(inode,
1326 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1327 OCFS2_INODE_UPDATE_CREDITS);
1328 if (IS_ERR(handle)) {
1329 ret = PTR_ERR(handle);
1334 ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
1335 OCFS2_JOURNAL_ACCESS_WRITE);
1341 if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1342 /* set extended attribute in external block. */
1343 ret = ocfs2_extend_trans(handle,
1344 OCFS2_INODE_UPDATE_CREDITS +
1345 OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
1350 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1351 OCFS2_JOURNAL_ACCESS_WRITE);
1359 * Set value in local, include set tree root in local.
1360 * This is the first step for value size >INLINE_SIZE.
1362 ocfs2_xattr_set_entry_local(inode, &xi_l, xs, last, min_offs);
1364 if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1365 ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
1372 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) &&
1373 (flag & OCFS2_INLINE_XATTR_FL)) {
1374 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1375 unsigned int xattrsize = osb->s_xattr_inline_size;
1378 * Adjust extent record count or inline data size
1379 * to reserve space for extended attribute.
1381 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1382 struct ocfs2_inline_data *idata = &di->id2.i_data;
1383 le16_add_cpu(&idata->id_count, -xattrsize);
1384 } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
1385 struct ocfs2_extent_list *el = &di->id2.i_list;
1386 le16_add_cpu(&el->l_count, -(xattrsize /
1387 sizeof(struct ocfs2_extent_rec)));
1389 di->i_xattr_inline_size = cpu_to_le16(xattrsize);
1391 /* Update xattr flag */
1392 spin_lock(&oi->ip_lock);
1393 oi->ip_dyn_features |= flag;
1394 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1395 spin_unlock(&oi->ip_lock);
1396 /* Update inode ctime */
1397 inode->i_ctime = CURRENT_TIME;
1398 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
1399 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
1401 ret = ocfs2_journal_dirty(handle, xs->inode_bh);
1406 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1408 if (!ret && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1410 * Set value outside in B tree.
1411 * This is the second step for value size > INLINE_SIZE.
1413 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1414 ret = ocfs2_xattr_set_value_outside(inode, xi, xs, offs);
1420 * If set value outside failed, we have to clean
1421 * the junk tree root we have already set in local.
1423 ret2 = ocfs2_xattr_cleanup(inode, xi, xs, offs);
1433 static int ocfs2_remove_value_outside(struct inode*inode,
1434 struct buffer_head *bh,
1435 struct ocfs2_xattr_header *header)
1439 for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
1440 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
1442 if (!ocfs2_xattr_is_local(entry)) {
1443 struct ocfs2_xattr_value_root *xv;
1446 val = (void *)header +
1447 le16_to_cpu(entry->xe_name_offset);
1448 xv = (struct ocfs2_xattr_value_root *)
1449 (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
1450 ret = ocfs2_xattr_value_truncate(inode, bh, xv, 0);
1461 static int ocfs2_xattr_ibody_remove(struct inode *inode,
1462 struct buffer_head *di_bh)
1465 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1466 struct ocfs2_xattr_header *header;
1469 header = (struct ocfs2_xattr_header *)
1470 ((void *)di + inode->i_sb->s_blocksize -
1471 le16_to_cpu(di->i_xattr_inline_size));
1473 ret = ocfs2_remove_value_outside(inode, di_bh, header);
1478 static int ocfs2_xattr_block_remove(struct inode *inode,
1479 struct buffer_head *blk_bh)
1481 struct ocfs2_xattr_block *xb;
1484 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1485 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
1486 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
1487 ret = ocfs2_remove_value_outside(inode, blk_bh, header);
1489 ret = ocfs2_delete_xattr_index_block(inode, blk_bh);
1494 static int ocfs2_xattr_free_block(struct inode *inode,
1497 struct inode *xb_alloc_inode;
1498 struct buffer_head *xb_alloc_bh = NULL;
1499 struct buffer_head *blk_bh = NULL;
1500 struct ocfs2_xattr_block *xb;
1501 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1507 ret = ocfs2_read_block(osb, block, &blk_bh,
1508 OCFS2_BH_CACHED, inode);
1514 /*Verify the signature of xattr block*/
1515 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
1516 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
1521 ret = ocfs2_xattr_block_remove(inode, blk_bh);
1527 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1528 blk = le64_to_cpu(xb->xb_blkno);
1529 bit = le16_to_cpu(xb->xb_suballoc_bit);
1530 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
1532 xb_alloc_inode = ocfs2_get_system_file_inode(osb,
1533 EXTENT_ALLOC_SYSTEM_INODE,
1534 le16_to_cpu(xb->xb_suballoc_slot));
1535 if (!xb_alloc_inode) {
1540 mutex_lock(&xb_alloc_inode->i_mutex);
1542 ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
1548 handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
1549 if (IS_ERR(handle)) {
1550 ret = PTR_ERR(handle);
1555 ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
1560 ocfs2_commit_trans(osb, handle);
1562 ocfs2_inode_unlock(xb_alloc_inode, 1);
1563 brelse(xb_alloc_bh);
1565 mutex_unlock(&xb_alloc_inode->i_mutex);
1566 iput(xb_alloc_inode);
1573 * ocfs2_xattr_remove()
1575 * Free extended attribute resources associated with this inode.
1577 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
1579 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1580 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1584 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1587 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1590 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
1591 ret = ocfs2_xattr_ibody_remove(inode, di_bh);
1598 if (di->i_xattr_loc) {
1599 ret = ocfs2_xattr_free_block(inode,
1600 le64_to_cpu(di->i_xattr_loc));
1607 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1608 OCFS2_INODE_UPDATE_CREDITS);
1609 if (IS_ERR(handle)) {
1610 ret = PTR_ERR(handle);
1614 ret = ocfs2_journal_access(handle, inode, di_bh,
1615 OCFS2_JOURNAL_ACCESS_WRITE);
1621 di->i_xattr_loc = 0;
1623 spin_lock(&oi->ip_lock);
1624 oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
1625 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1626 spin_unlock(&oi->ip_lock);
1628 ret = ocfs2_journal_dirty(handle, di_bh);
1632 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1637 static int ocfs2_xattr_has_space_inline(struct inode *inode,
1638 struct ocfs2_dinode *di)
1640 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1641 unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
1644 if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
1647 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1648 struct ocfs2_inline_data *idata = &di->id2.i_data;
1649 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
1650 } else if (ocfs2_inode_is_fast_symlink(inode)) {
1651 free = ocfs2_fast_symlink_chars(inode->i_sb) -
1652 le64_to_cpu(di->i_size);
1654 struct ocfs2_extent_list *el = &di->id2.i_list;
1655 free = (le16_to_cpu(el->l_count) -
1656 le16_to_cpu(el->l_next_free_rec)) *
1657 sizeof(struct ocfs2_extent_rec);
1659 if (free >= xattrsize)
1666 * ocfs2_xattr_ibody_find()
1668 * Find extended attribute in inode block and
1669 * fill search info into struct ocfs2_xattr_search.
1671 static int ocfs2_xattr_ibody_find(struct inode *inode,
1674 struct ocfs2_xattr_search *xs)
1676 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1677 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1681 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
1684 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
1685 down_read(&oi->ip_alloc_sem);
1686 has_space = ocfs2_xattr_has_space_inline(inode, di);
1687 up_read(&oi->ip_alloc_sem);
1692 xs->xattr_bh = xs->inode_bh;
1693 xs->end = (void *)di + inode->i_sb->s_blocksize;
1694 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
1695 xs->header = (struct ocfs2_xattr_header *)
1696 (xs->end - le16_to_cpu(di->i_xattr_inline_size));
1698 xs->header = (struct ocfs2_xattr_header *)
1699 (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
1700 xs->base = (void *)xs->header;
1701 xs->here = xs->header->xh_entries;
1703 /* Find the named attribute. */
1704 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
1705 ret = ocfs2_xattr_find_entry(name_index, name, xs);
1706 if (ret && ret != -ENODATA)
1708 xs->not_found = ret;
1715 * ocfs2_xattr_ibody_set()
1717 * Set, replace or remove an extended attribute into inode block.
1720 static int ocfs2_xattr_ibody_set(struct inode *inode,
1721 struct ocfs2_xattr_info *xi,
1722 struct ocfs2_xattr_search *xs)
1724 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1725 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1728 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
1731 down_write(&oi->ip_alloc_sem);
1732 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
1733 if (!ocfs2_xattr_has_space_inline(inode, di)) {
1739 ret = ocfs2_xattr_set_entry(inode, xi, xs,
1740 (OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL));
1742 up_write(&oi->ip_alloc_sem);
1748 * ocfs2_xattr_block_find()
1750 * Find extended attribute in external block and
1751 * fill search info into struct ocfs2_xattr_search.
1753 static int ocfs2_xattr_block_find(struct inode *inode,
1756 struct ocfs2_xattr_search *xs)
1758 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1759 struct buffer_head *blk_bh = NULL;
1760 struct ocfs2_xattr_block *xb;
1763 if (!di->i_xattr_loc)
1766 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
1767 le64_to_cpu(di->i_xattr_loc),
1768 &blk_bh, OCFS2_BH_CACHED, inode);
1773 /*Verify the signature of xattr block*/
1774 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
1775 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
1780 xs->xattr_bh = blk_bh;
1781 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1783 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
1784 xs->header = &xb->xb_attrs.xb_header;
1785 xs->base = (void *)xs->header;
1786 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
1787 xs->here = xs->header->xh_entries;
1789 ret = ocfs2_xattr_find_entry(name_index, name, xs);
1791 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
1795 if (ret && ret != -ENODATA) {
1796 xs->xattr_bh = NULL;
1799 xs->not_found = ret;
1808 * When all the xattrs are deleted from index btree, the ocfs2_xattr_tree
1809 * will be erased and ocfs2_xattr_block will have its ocfs2_xattr_header
1812 static int ocfs2_restore_xattr_block(struct inode *inode,
1813 struct ocfs2_xattr_search *xs)
1817 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1818 struct ocfs2_xattr_block *xb =
1819 (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1820 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
1821 u16 xb_flags = le16_to_cpu(xb->xb_flags);
1823 BUG_ON(!(xb_flags & OCFS2_XATTR_INDEXED) ||
1824 le16_to_cpu(el->l_next_free_rec) != 0);
1826 handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
1827 if (IS_ERR(handle)) {
1828 ret = PTR_ERR(handle);
1833 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1834 OCFS2_JOURNAL_ACCESS_WRITE);
1840 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
1841 offsetof(struct ocfs2_xattr_block, xb_attrs));
1843 xb->xb_flags = cpu_to_le16(xb_flags & ~OCFS2_XATTR_INDEXED);
1845 ocfs2_journal_dirty(handle, xs->xattr_bh);
1848 ocfs2_commit_trans(osb, handle);
1854 * ocfs2_xattr_block_set()
1856 * Set, replace or remove an extended attribute into external block.
1859 static int ocfs2_xattr_block_set(struct inode *inode,
1860 struct ocfs2_xattr_info *xi,
1861 struct ocfs2_xattr_search *xs)
1863 struct buffer_head *new_bh = NULL;
1864 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1865 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1866 struct ocfs2_alloc_context *meta_ac = NULL;
1867 handle_t *handle = NULL;
1868 struct ocfs2_xattr_block *xblk = NULL;
1869 u16 suballoc_bit_start;
1874 if (!xs->xattr_bh) {
1876 * Alloc one external block for extended attribute
1879 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
1884 handle = ocfs2_start_trans(osb,
1885 OCFS2_XATTR_BLOCK_CREATE_CREDITS);
1886 if (IS_ERR(handle)) {
1887 ret = PTR_ERR(handle);
1891 ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
1892 OCFS2_JOURNAL_ACCESS_CREATE);
1898 ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1,
1899 &suballoc_bit_start, &num_got,
1906 new_bh = sb_getblk(inode->i_sb, first_blkno);
1907 ocfs2_set_new_buffer_uptodate(inode, new_bh);
1909 ret = ocfs2_journal_access(handle, inode, new_bh,
1910 OCFS2_JOURNAL_ACCESS_CREATE);
1916 /* Initialize ocfs2_xattr_block */
1917 xs->xattr_bh = new_bh;
1918 xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
1919 memset(xblk, 0, inode->i_sb->s_blocksize);
1920 strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
1921 xblk->xb_suballoc_slot = cpu_to_le16(osb->slot_num);
1922 xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
1923 xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation);
1924 xblk->xb_blkno = cpu_to_le64(first_blkno);
1926 xs->header = &xblk->xb_attrs.xb_header;
1927 xs->base = (void *)xs->header;
1928 xs->end = (void *)xblk + inode->i_sb->s_blocksize;
1929 xs->here = xs->header->xh_entries;
1932 ret = ocfs2_journal_dirty(handle, new_bh);
1937 di->i_xattr_loc = cpu_to_le64(first_blkno);
1938 ret = ocfs2_journal_dirty(handle, xs->inode_bh);
1942 ocfs2_commit_trans(osb, handle);
1945 ocfs2_free_alloc_context(meta_ac);
1949 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1951 if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
1952 /* Set extended attribute into external block */
1953 ret = ocfs2_xattr_set_entry(inode, xi, xs, OCFS2_HAS_XATTR_FL);
1954 if (!ret || ret != -ENOSPC)
1957 ret = ocfs2_xattr_create_index_block(inode, xs);
1962 ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs);
1963 if (!ret && xblk->xb_attrs.xb_root.xt_list.l_next_free_rec == 0)
1964 ret = ocfs2_restore_xattr_block(inode, xs);
1974 * Set, replace or remove an extended attribute for this inode.
1975 * value is NULL to remove an existing extended attribute, else either
1976 * create or replace an extended attribute.
1978 int ocfs2_xattr_set(struct inode *inode,
1985 struct buffer_head *di_bh = NULL;
1986 struct ocfs2_dinode *di;
1988 u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
1990 struct ocfs2_xattr_info xi = {
1991 .name_index = name_index,
1994 .value_len = value_len,
1997 struct ocfs2_xattr_search xis = {
1998 .not_found = -ENODATA,
2001 struct ocfs2_xattr_search xbs = {
2002 .not_found = -ENODATA,
2005 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2008 ret = ocfs2_inode_lock(inode, &di_bh, 1);
2013 xis.inode_bh = xbs.inode_bh = di_bh;
2014 di = (struct ocfs2_dinode *)di_bh->b_data;
2016 down_write(&OCFS2_I(inode)->ip_xattr_sem);
2018 * Scan inode and external block to find the same name
2019 * extended attribute and collect search infomation.
2021 ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
2024 if (xis.not_found) {
2025 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
2030 if (xis.not_found && xbs.not_found) {
2032 if (flags & XATTR_REPLACE)
2039 if (flags & XATTR_CREATE)
2044 /* Remove existing extended attribute */
2046 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
2047 else if (!xbs.not_found)
2048 ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
2050 /* We always try to set extended attribute into inode first*/
2051 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
2052 if (!ret && !xbs.not_found) {
2054 * If succeed and that extended attribute existing in
2055 * external block, then we will remove it.
2059 ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
2060 } else if (ret == -ENOSPC) {
2061 if (di->i_xattr_loc && !xbs.xattr_bh) {
2062 ret = ocfs2_xattr_block_find(inode, name_index,
2068 * If no space in inode, we will set extended attribute
2069 * into external block.
2071 ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
2074 if (!xis.not_found) {
2076 * If succeed and that extended attribute
2077 * existing in inode, we will remove it.
2081 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
2086 up_write(&OCFS2_I(inode)->ip_xattr_sem);
2087 ocfs2_inode_unlock(inode, 1);
2089 brelse(xbs.xattr_bh);
2090 for (i = 0; i < blk_per_bucket; i++)
2091 brelse(xbs.bucket.bhs[i]);
2096 static inline u32 ocfs2_xattr_hash_by_name(struct inode *inode,
2098 const char *suffix_name)
2100 struct xattr_handler *handler = ocfs2_xattr_handler(name_index);
2101 char *prefix = handler->prefix;
2102 int prefix_len = strlen(handler->prefix);
2104 return ocfs2_xattr_name_hash(inode, prefix, prefix_len,
2105 (char *)suffix_name, strlen(suffix_name));
2109 * Find the xattr extent rec which may contains name_hash.
2110 * e_cpos will be the first name hash of the xattr rec.
2111 * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
2113 static int ocfs2_xattr_get_rec(struct inode *inode,
2118 struct ocfs2_extent_list *el)
2121 struct buffer_head *eb_bh = NULL;
2122 struct ocfs2_extent_block *eb;
2123 struct ocfs2_extent_rec *rec = NULL;
2126 if (el->l_tree_depth) {
2127 ret = ocfs2_find_leaf(inode, el, name_hash, &eb_bh);
2133 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2136 if (el->l_tree_depth) {
2137 ocfs2_error(inode->i_sb,
2138 "Inode %lu has non zero tree depth in "
2139 "xattr tree block %llu\n", inode->i_ino,
2140 (unsigned long long)eb_bh->b_blocknr);
2146 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
2147 rec = &el->l_recs[i];
2149 if (le32_to_cpu(rec->e_cpos) <= name_hash) {
2150 e_blkno = le64_to_cpu(rec->e_blkno);
2156 ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
2157 "record (%u, %u, 0) in xattr", inode->i_ino,
2158 le32_to_cpu(rec->e_cpos),
2159 ocfs2_rec_clusters(el, rec));
2164 *p_blkno = le64_to_cpu(rec->e_blkno);
2165 *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
2167 *e_cpos = le32_to_cpu(rec->e_cpos);
2173 typedef int (xattr_bucket_func)(struct inode *inode,
2174 struct ocfs2_xattr_bucket *bucket,
2177 static int ocfs2_find_xe_in_bucket(struct inode *inode,
2178 struct buffer_head *header_bh,
2185 int i, ret = 0, cmp = 1, block_off, new_offset;
2186 struct ocfs2_xattr_header *xh =
2187 (struct ocfs2_xattr_header *)header_bh->b_data;
2188 size_t name_len = strlen(name);
2189 struct ocfs2_xattr_entry *xe = NULL;
2190 struct buffer_head *name_bh = NULL;
2194 * We don't use binary search in the bucket because there
2195 * may be multiple entries with the same name hash.
2197 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
2198 xe = &xh->xh_entries[i];
2200 if (name_hash > le32_to_cpu(xe->xe_name_hash))
2202 else if (name_hash < le32_to_cpu(xe->xe_name_hash))
2205 cmp = name_index - ocfs2_xattr_get_type(xe);
2207 cmp = name_len - xe->xe_name_len;
2211 ret = ocfs2_xattr_bucket_get_name_value(inode,
2221 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
2222 header_bh->b_blocknr + block_off,
2223 &name_bh, OCFS2_BH_CACHED, inode);
2228 xe_name = name_bh->b_data + new_offset;
2230 cmp = memcmp(name, xe_name, name_len);
2246 * Find the specified xattr entry in a series of buckets.
2247 * This series start from p_blkno and last for num_clusters.
2248 * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
2249 * the num of the valid buckets.
2251 * Return the buffer_head this xattr should reside in. And if the xattr's
2252 * hash is in the gap of 2 buckets, return the lower bucket.
2254 static int ocfs2_xattr_bucket_find(struct inode *inode,
2261 struct ocfs2_xattr_search *xs)
2264 struct buffer_head *bh = NULL;
2265 struct buffer_head *lower_bh = NULL;
2266 struct ocfs2_xattr_header *xh = NULL;
2267 struct ocfs2_xattr_entry *xe = NULL;
2269 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2270 int low_bucket = 0, bucket, high_bucket;
2274 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), p_blkno,
2275 &bh, OCFS2_BH_CACHED, inode);
2281 xh = (struct ocfs2_xattr_header *)bh->b_data;
2282 high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
2284 while (low_bucket <= high_bucket) {
2287 bucket = (low_bucket + high_bucket) / 2;
2289 blkno = p_blkno + bucket * blk_per_bucket;
2291 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno,
2292 &bh, OCFS2_BH_CACHED, inode);
2298 xh = (struct ocfs2_xattr_header *)bh->b_data;
2299 xe = &xh->xh_entries[0];
2300 if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
2301 high_bucket = bucket - 1;
2306 * Check whether the hash of the last entry in our
2307 * bucket is larger than the search one. for an empty
2308 * bucket, the last one is also the first one.
2311 xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
2313 last_hash = le32_to_cpu(xe->xe_name_hash);
2315 /* record lower_bh which may be the insert place. */
2320 if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
2321 low_bucket = bucket + 1;
2325 /* the searched xattr should reside in this bucket if exists. */
2326 ret = ocfs2_find_xe_in_bucket(inode, lower_bh,
2327 name_index, name, name_hash,
2337 * Record the bucket we have found.
2338 * When the xattr's hash value is in the gap of 2 buckets, we will
2339 * always set it to the previous bucket.
2343 * We can't find any bucket whose first name_hash is less
2344 * than the find name_hash.
2346 BUG_ON(bh->b_blocknr != p_blkno);
2350 xs->bucket.bhs[0] = lower_bh;
2351 xs->bucket.xh = (struct ocfs2_xattr_header *)
2352 xs->bucket.bhs[0]->b_data;
2355 xs->header = xs->bucket.xh;
2356 xs->base = xs->bucket.bhs[0]->b_data;
2357 xs->end = xs->base + inode->i_sb->s_blocksize;
2361 * If we have found the xattr enty, read all the blocks in
2364 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb),
2365 xs->bucket.bhs[0]->b_blocknr + 1,
2366 blk_per_bucket - 1, &xs->bucket.bhs[1],
2367 OCFS2_BH_CACHED, inode);
2373 xs->here = &xs->header->xh_entries[index];
2374 mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name,
2375 (unsigned long long)xs->bucket.bhs[0]->b_blocknr, index);
2385 static int ocfs2_xattr_index_block_find(struct inode *inode,
2386 struct buffer_head *root_bh,
2389 struct ocfs2_xattr_search *xs)
2392 struct ocfs2_xattr_block *xb =
2393 (struct ocfs2_xattr_block *)root_bh->b_data;
2394 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
2395 struct ocfs2_extent_list *el = &xb_root->xt_list;
2397 u32 first_hash, num_clusters = 0;
2398 u32 name_hash = ocfs2_xattr_hash_by_name(inode, name_index, name);
2400 if (le16_to_cpu(el->l_next_free_rec) == 0)
2403 mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n",
2404 name, name_hash, name_index);
2406 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
2413 BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
2415 mlog(0, "find xattr extent rec %u clusters from %llu, the first hash "
2416 "in the rec is %u\n", num_clusters, p_blkno, first_hash);
2418 ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
2419 p_blkno, first_hash, num_clusters, xs);
2425 static int ocfs2_iterate_xattr_buckets(struct inode *inode,
2428 xattr_bucket_func *func,
2432 int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2433 u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
2434 u32 num_buckets = clusters * bpc;
2435 struct ocfs2_xattr_bucket bucket;
2437 memset(&bucket, 0, sizeof(bucket));
2439 mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n",
2442 for (i = 0; i < num_buckets; i++, blkno += blk_per_bucket) {
2443 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb),
2444 blkno, blk_per_bucket,
2445 bucket.bhs, OCFS2_BH_CACHED, inode);
2451 bucket.xh = (struct ocfs2_xattr_header *)bucket.bhs[0]->b_data;
2453 * The real bucket num in this series of blocks is stored
2454 * in the 1st bucket.
2457 num_buckets = le16_to_cpu(bucket.xh->xh_num_buckets);
2459 mlog(0, "iterating xattr bucket %llu, first hash %u\n", blkno,
2460 le32_to_cpu(bucket.xh->xh_entries[0].xe_name_hash));
2462 ret = func(inode, &bucket, para);
2469 for (j = 0; j < blk_per_bucket; j++)
2470 brelse(bucket.bhs[j]);
2471 memset(&bucket, 0, sizeof(bucket));
2475 for (j = 0; j < blk_per_bucket; j++)
2476 brelse(bucket.bhs[j]);
2481 struct ocfs2_xattr_tree_list {
2486 static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
2487 struct ocfs2_xattr_header *xh,
2494 if (index < 0 || index >= le16_to_cpu(xh->xh_count))
2497 name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
2499 *block_off = name_offset >> inode->i_sb->s_blocksize_bits;
2500 *new_offset = name_offset % inode->i_sb->s_blocksize;
2505 static int ocfs2_list_xattr_bucket(struct inode *inode,
2506 struct ocfs2_xattr_bucket *bucket,
2510 struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
2512 int i, block_off, new_offset;
2514 for (i = 0 ; i < le16_to_cpu(bucket->xh->xh_count); i++) {
2515 struct ocfs2_xattr_entry *entry = &bucket->xh->xh_entries[i];
2516 struct xattr_handler *handler =
2517 ocfs2_xattr_handler(ocfs2_xattr_get_type(entry));
2520 ret = ocfs2_xattr_bucket_get_name_value(inode,
2527 size = handler->list(inode, xl->buffer, xl->buffer_size,
2528 bucket->bhs[block_off]->b_data +
2530 entry->xe_name_len);
2532 if (size > xl->buffer_size)
2536 xl->buffer_size -= size;
2543 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
2544 struct ocfs2_xattr_tree_root *xt,
2548 struct ocfs2_extent_list *el = &xt->xt_list;
2550 u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
2552 struct ocfs2_xattr_tree_list xl = {
2554 .buffer_size = buffer_size,
2557 if (le16_to_cpu(el->l_next_free_rec) == 0)
2560 while (name_hash > 0) {
2561 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
2562 &e_cpos, &num_clusters, el);
2568 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
2569 ocfs2_list_xattr_bucket,
2579 name_hash = e_cpos - 1;
2582 ret = buffer_size - xl.buffer_size;
2587 static int cmp_xe(const void *a, const void *b)
2589 const struct ocfs2_xattr_entry *l = a, *r = b;
2590 u32 l_hash = le32_to_cpu(l->xe_name_hash);
2591 u32 r_hash = le32_to_cpu(r->xe_name_hash);
2593 if (l_hash > r_hash)
2595 if (l_hash < r_hash)
2600 static void swap_xe(void *a, void *b, int size)
2602 struct ocfs2_xattr_entry *l = a, *r = b, tmp;
2605 memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
2606 memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
2610 * When the ocfs2_xattr_block is filled up, new bucket will be created
2611 * and all the xattr entries will be moved to the new bucket.
2612 * Note: we need to sort the entries since they are not saved in order
2613 * in the ocfs2_xattr_block.
2615 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
2616 struct buffer_head *xb_bh,
2617 struct buffer_head *xh_bh,
2618 struct buffer_head *data_bh)
2620 int i, blocksize = inode->i_sb->s_blocksize;
2621 u16 offset, size, off_change;
2622 struct ocfs2_xattr_entry *xe;
2623 struct ocfs2_xattr_block *xb =
2624 (struct ocfs2_xattr_block *)xb_bh->b_data;
2625 struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
2626 struct ocfs2_xattr_header *xh =
2627 (struct ocfs2_xattr_header *)xh_bh->b_data;
2628 u16 count = le16_to_cpu(xb_xh->xh_count);
2629 char *target = xh_bh->b_data, *src = xb_bh->b_data;
2631 mlog(0, "cp xattr from block %llu to bucket %llu\n",
2632 (unsigned long long)xb_bh->b_blocknr,
2633 (unsigned long long)xh_bh->b_blocknr);
2635 memset(xh_bh->b_data, 0, blocksize);
2637 memset(data_bh->b_data, 0, blocksize);
2639 * Since the xe_name_offset is based on ocfs2_xattr_header,
2640 * there is a offset change corresponding to the change of
2641 * ocfs2_xattr_header's position.
2643 off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
2644 xe = &xb_xh->xh_entries[count - 1];
2645 offset = le16_to_cpu(xe->xe_name_offset) + off_change;
2646 size = blocksize - offset;
2648 /* copy all the names and values. */
2650 target = data_bh->b_data;
2651 memcpy(target + offset, src + offset, size);
2653 /* Init new header now. */
2654 xh->xh_count = xb_xh->xh_count;
2655 xh->xh_num_buckets = cpu_to_le16(1);
2656 xh->xh_name_value_len = cpu_to_le16(size);
2657 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
2659 /* copy all the entries. */
2660 target = xh_bh->b_data;
2661 offset = offsetof(struct ocfs2_xattr_header, xh_entries);
2662 size = count * sizeof(struct ocfs2_xattr_entry);
2663 memcpy(target + offset, (char *)xb_xh + offset, size);
2665 /* Change the xe offset for all the xe because of the move. */
2666 off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
2667 offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
2668 for (i = 0; i < count; i++)
2669 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
2671 mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n",
2672 offset, size, off_change);
2674 sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
2679 * After we move xattr from block to index btree, we have to
2680 * update ocfs2_xattr_search to the new xe and base.
2682 * When the entry is in xattr block, xattr_bh indicates the storage place.
2683 * While if the entry is in index b-tree, "bucket" indicates the
2684 * real place of the xattr.
2686 static int ocfs2_xattr_update_xattr_search(struct inode *inode,
2687 struct ocfs2_xattr_search *xs,
2688 struct buffer_head *old_bh,
2689 struct buffer_head *new_bh)
2692 char *buf = old_bh->b_data;
2693 struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
2694 struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
2695 int i, blocksize = inode->i_sb->s_blocksize;
2696 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2698 xs->bucket.bhs[0] = new_bh;
2700 xs->bucket.xh = (struct ocfs2_xattr_header *)xs->bucket.bhs[0]->b_data;
2701 xs->header = xs->bucket.xh;
2703 xs->base = new_bh->b_data;
2704 xs->end = xs->base + inode->i_sb->s_blocksize;
2706 if (!xs->not_found) {
2707 if (OCFS2_XATTR_BUCKET_SIZE != blocksize) {
2708 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb),
2709 xs->bucket.bhs[0]->b_blocknr + 1,
2710 blk_per_bucket - 1, &xs->bucket.bhs[1],
2711 OCFS2_BH_CACHED, inode);
2717 i = xs->here - old_xh->xh_entries;
2718 xs->here = &xs->header->xh_entries[i];
2725 static int ocfs2_xattr_create_index_block(struct inode *inode,
2726 struct ocfs2_xattr_search *xs)
2728 int ret, credits = OCFS2_SUBALLOC_ALLOC;
2732 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2733 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2734 struct ocfs2_alloc_context *data_ac;
2735 struct buffer_head *xh_bh = NULL, *data_bh = NULL;
2736 struct buffer_head *xb_bh = xs->xattr_bh;
2737 struct ocfs2_xattr_block *xb =
2738 (struct ocfs2_xattr_block *)xb_bh->b_data;
2739 struct ocfs2_xattr_tree_root *xr;
2740 u16 xb_flags = le16_to_cpu(xb->xb_flags);
2741 u16 bpb = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2743 mlog(0, "create xattr index block for %llu\n",
2744 (unsigned long long)xb_bh->b_blocknr);
2746 BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
2748 ret = ocfs2_reserve_clusters(osb, 1, &data_ac);
2756 * We can use this lock for now, and maybe move to a dedicated mutex
2757 * if performance becomes a problem later.
2759 down_write(&oi->ip_alloc_sem);
2762 * 3 more credits, one for xattr block update, one for the 1st block
2763 * of the new xattr bucket and one for the value/data.
2766 handle = ocfs2_start_trans(osb, credits);
2767 if (IS_ERR(handle)) {
2768 ret = PTR_ERR(handle);
2773 ret = ocfs2_journal_access(handle, inode, xb_bh,
2774 OCFS2_JOURNAL_ACCESS_WRITE);
2780 ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off, &len);
2787 * The bucket may spread in many blocks, and
2788 * we will only touch the 1st block and the last block
2789 * in the whole bucket(one for entry and one for data).
2791 blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
2793 mlog(0, "allocate 1 cluster from %llu to xattr block\n", blkno);
2795 xh_bh = sb_getblk(inode->i_sb, blkno);
2802 ocfs2_set_new_buffer_uptodate(inode, xh_bh);
2804 ret = ocfs2_journal_access(handle, inode, xh_bh,
2805 OCFS2_JOURNAL_ACCESS_CREATE);
2812 data_bh = sb_getblk(inode->i_sb, blkno + bpb - 1);
2819 ocfs2_set_new_buffer_uptodate(inode, data_bh);
2821 ret = ocfs2_journal_access(handle, inode, data_bh,
2822 OCFS2_JOURNAL_ACCESS_CREATE);
2829 ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xh_bh, data_bh);
2831 ocfs2_journal_dirty(handle, xh_bh);
2833 ocfs2_journal_dirty(handle, data_bh);
2835 ocfs2_xattr_update_xattr_search(inode, xs, xb_bh, xh_bh);
2837 /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
2838 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
2839 offsetof(struct ocfs2_xattr_block, xb_attrs));
2841 xr = &xb->xb_attrs.xb_root;
2842 xr->xt_clusters = cpu_to_le32(1);
2843 xr->xt_last_eb_blk = 0;
2844 xr->xt_list.l_tree_depth = 0;
2845 xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
2846 xr->xt_list.l_next_free_rec = cpu_to_le16(1);
2848 xr->xt_list.l_recs[0].e_cpos = 0;
2849 xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
2850 xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
2852 xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
2854 ret = ocfs2_journal_dirty(handle, xb_bh);
2861 ocfs2_commit_trans(osb, handle);
2864 up_write(&oi->ip_alloc_sem);
2868 ocfs2_free_alloc_context(data_ac);
2876 static int cmp_xe_offset(const void *a, const void *b)
2878 const struct ocfs2_xattr_entry *l = a, *r = b;
2879 u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
2880 u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
2882 if (l_name_offset < r_name_offset)
2884 if (l_name_offset > r_name_offset)
2890 * defrag a xattr bucket if we find that the bucket has some
2891 * holes beteen name/value pairs.
2892 * We will move all the name/value pairs to the end of the bucket
2893 * so that we can spare some space for insertion.
2895 static int ocfs2_defrag_xattr_bucket(struct inode *inode,
2896 struct ocfs2_xattr_bucket *bucket)
2899 size_t end, offset, len, value_len;
2900 struct ocfs2_xattr_header *xh;
2901 char *entries, *buf, *bucket_buf = NULL;
2902 u64 blkno = bucket->bhs[0]->b_blocknr;
2903 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2905 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2906 size_t blocksize = inode->i_sb->s_blocksize;
2908 struct buffer_head **bhs;
2909 struct ocfs2_xattr_entry *xe;
2911 bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
2916 ret = ocfs2_read_blocks(osb, blkno, blk_per_bucket, bhs,
2917 OCFS2_BH_CACHED, inode);
2922 * In order to make the operation more efficient and generic,
2923 * we copy all the blocks into a contiguous memory and do the
2924 * defragment there, so if anything is error, we will not touch
2927 bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
2934 for (i = 0; i < blk_per_bucket; i++, buf += blocksize)
2935 memcpy(buf, bhs[i]->b_data, blocksize);
2937 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), blk_per_bucket);
2938 if (IS_ERR(handle)) {
2939 ret = PTR_ERR(handle);
2945 for (i = 0; i < blk_per_bucket; i++) {
2946 ret = ocfs2_journal_access(handle, inode, bhs[i],
2947 OCFS2_JOURNAL_ACCESS_WRITE);
2954 xh = (struct ocfs2_xattr_header *)bucket_buf;
2955 entries = (char *)xh->xh_entries;
2956 xh_free_start = le16_to_cpu(xh->xh_free_start);
2958 mlog(0, "adjust xattr bucket in %llu, count = %u, "
2959 "xh_free_start = %u, xh_name_value_len = %u.\n",
2960 blkno, le16_to_cpu(xh->xh_count), xh_free_start,
2961 le16_to_cpu(xh->xh_name_value_len));
2964 * sort all the entries by their offset.
2965 * the largest will be the first, so that we can
2966 * move them to the end one by one.
2968 sort(entries, le16_to_cpu(xh->xh_count),
2969 sizeof(struct ocfs2_xattr_entry),
2970 cmp_xe_offset, swap_xe);
2972 /* Move all name/values to the end of the bucket. */
2973 xe = xh->xh_entries;
2974 end = OCFS2_XATTR_BUCKET_SIZE;
2975 for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
2976 offset = le16_to_cpu(xe->xe_name_offset);
2977 if (ocfs2_xattr_is_local(xe))
2978 value_len = OCFS2_XATTR_SIZE(
2979 le64_to_cpu(xe->xe_value_size));
2981 value_len = OCFS2_XATTR_ROOT_SIZE;
2982 len = OCFS2_XATTR_SIZE(xe->xe_name_len) + value_len;
2985 * We must make sure that the name/value pair
2986 * exist in the same block. So adjust end to
2987 * the previous block end if needed.
2989 if (((end - len) / blocksize !=
2990 (end - 1) / blocksize))
2991 end = end - end % blocksize;
2993 if (end > offset + len) {
2994 memmove(bucket_buf + end - len,
2995 bucket_buf + offset, len);
2996 xe->xe_name_offset = cpu_to_le16(end - len);
2999 mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
3000 "bucket %llu\n", (unsigned long long)blkno);
3005 mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
3006 "bucket %llu\n", (unsigned long long)blkno);
3008 if (xh_free_start == end)
3011 memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
3012 xh->xh_free_start = cpu_to_le16(end);
3014 /* sort the entries by their name_hash. */
3015 sort(entries, le16_to_cpu(xh->xh_count),
3016 sizeof(struct ocfs2_xattr_entry),
3020 for (i = 0; i < blk_per_bucket; i++, buf += blocksize) {
3021 memcpy(bhs[i]->b_data, buf, blocksize);
3022 ocfs2_journal_dirty(handle, bhs[i]);
3026 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
3030 for (i = 0; i < blk_per_bucket; i++)
3040 * Move half nums of the xattr bucket in the previous cluster to this new
3041 * cluster. We only touch the last cluster of the previous extend record.
3043 * first_bh is the first buffer_head of a series of bucket in the same
3044 * extent rec and header_bh is the header of one bucket in this cluster.
3045 * They will be updated if we move the data header_bh contains to the new
3046 * cluster. first_hash will be set as the 1st xe's name_hash of the new cluster.
3048 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
3050 struct buffer_head **first_bh,
3051 struct buffer_head **header_bh,
3057 int i, ret, credits;
3058 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3059 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3060 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
3061 int blocksize = inode->i_sb->s_blocksize;
3062 struct buffer_head *old_bh, *new_bh, *prev_bh, *new_first_bh = NULL;
3063 struct ocfs2_xattr_header *new_xh;
3064 struct ocfs2_xattr_header *xh =
3065 (struct ocfs2_xattr_header *)((*first_bh)->b_data);
3067 BUG_ON(le16_to_cpu(xh->xh_num_buckets) < num_buckets);
3068 BUG_ON(OCFS2_XATTR_BUCKET_SIZE == osb->s_clustersize);
3070 prev_bh = *first_bh;
3072 xh = (struct ocfs2_xattr_header *)prev_bh->b_data;
3074 prev_blkno += (num_clusters - 1) * bpc + bpc / 2;
3076 mlog(0, "move half of xattrs in cluster %llu to %llu\n",
3077 prev_blkno, new_blkno);
3080 * We need to update the 1st half of the new cluster and
3081 * 1 more for the update of the 1st bucket of the previous
3084 credits = bpc / 2 + 1;
3085 ret = ocfs2_extend_trans(handle, credits);
3091 ret = ocfs2_journal_access(handle, inode, prev_bh,
3092 OCFS2_JOURNAL_ACCESS_WRITE);
3098 for (i = 0; i < bpc / 2; i++, prev_blkno++, new_blkno++) {
3099 old_bh = new_bh = NULL;
3100 new_bh = sb_getblk(inode->i_sb, new_blkno);
3107 ocfs2_set_new_buffer_uptodate(inode, new_bh);
3109 ret = ocfs2_journal_access(handle, inode, new_bh,
3110 OCFS2_JOURNAL_ACCESS_CREATE);
3117 ret = ocfs2_read_block(osb, prev_blkno,
3118 &old_bh, OCFS2_BH_CACHED, inode);
3125 memcpy(new_bh->b_data, old_bh->b_data, blocksize);
3128 new_xh = (struct ocfs2_xattr_header *)new_bh->b_data;
3129 new_xh->xh_num_buckets = cpu_to_le16(num_buckets / 2);
3132 *first_hash = le32_to_cpu(
3133 new_xh->xh_entries[0].xe_name_hash);
3134 new_first_bh = new_bh;
3135 get_bh(new_first_bh);
3138 ocfs2_journal_dirty(handle, new_bh);
3140 if (*header_bh == old_bh) {
3142 *header_bh = new_bh;
3146 *first_bh = new_first_bh;
3153 le16_add_cpu(&xh->xh_num_buckets, -(num_buckets / 2));
3155 ocfs2_journal_dirty(handle, prev_bh);
3158 brelse(new_first_bh);
3162 static int ocfs2_read_xattr_bucket(struct inode *inode,
3164 struct buffer_head **bhs,
3168 u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3171 return ocfs2_read_blocks(OCFS2_SB(inode->i_sb), blkno,
3172 blk_per_bucket, bhs,
3173 OCFS2_BH_CACHED, inode);
3175 for (i = 0; i < blk_per_bucket; i++) {
3176 bhs[i] = sb_getblk(inode->i_sb, blkno + i);
3177 if (bhs[i] == NULL) {
3182 ocfs2_set_new_buffer_uptodate(inode, bhs[i]);
3189 * Move half num of the xattrs in old bucket(blk) to new bucket(new_blk).
3190 * first_hash will record the 1st hash of the new bucket.
3192 static int ocfs2_half_xattr_bucket(struct inode *inode,
3197 int new_bucket_head)
3200 u16 count, start, len, name_value_len, xe_len, name_offset;
3201 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3202 struct buffer_head **s_bhs, **t_bhs = NULL;
3203 struct ocfs2_xattr_header *xh;
3204 struct ocfs2_xattr_entry *xe;
3205 int blocksize = inode->i_sb->s_blocksize;
3207 mlog(0, "move half of xattrs from bucket %llu to %llu\n",
3210 s_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
3214 ret = ocfs2_read_xattr_bucket(inode, blk, s_bhs, 0);
3220 ret = ocfs2_journal_access(handle, inode, s_bhs[0],
3221 OCFS2_JOURNAL_ACCESS_WRITE);
3227 t_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
3233 ret = ocfs2_read_xattr_bucket(inode, new_blk, t_bhs, new_bucket_head);
3239 for (i = 0; i < blk_per_bucket; i++) {
3240 ret = ocfs2_journal_access(handle, inode, t_bhs[i],
3241 OCFS2_JOURNAL_ACCESS_CREATE);
3248 /* copy the whole bucket to the new first. */
3249 for (i = 0; i < blk_per_bucket; i++)
3250 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);
3252 /* update the new bucket. */
3253 xh = (struct ocfs2_xattr_header *)t_bhs[0]->b_data;
3254 count = le16_to_cpu(xh->xh_count);
3258 * Calculate the total name/value len and xh_free_start for
3259 * the old bucket first.
3261 name_offset = OCFS2_XATTR_BUCKET_SIZE;
3263 for (i = 0; i < start; i++) {
3264 xe = &xh->xh_entries[i];
3265 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3266 if (ocfs2_xattr_is_local(xe))
3268 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3270 xe_len += OCFS2_XATTR_ROOT_SIZE;
3271 name_value_len += xe_len;
3272 if (le16_to_cpu(xe->xe_name_offset) < name_offset)
3273 name_offset = le16_to_cpu(xe->xe_name_offset);
3277 * Now begin the modification to the new bucket.
3279 * In the new bucket, We just move the xattr entry to the beginning
3280 * and don't touch the name/value. So there will be some holes in the
3281 * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
3284 xe = &xh->xh_entries[start];
3285 len = sizeof(struct ocfs2_xattr_entry) * (count - start);
3286 mlog(0, "mv xattr entry len %d from %d to %d\n", len,
3287 (int)((char *)xe - (char *)xh),
3288 (int)((char *)xh->xh_entries - (char *)xh));
3289 memmove((char *)xh->xh_entries, (char *)xe, len);
3290 xe = &xh->xh_entries[count - start];
3291 len = sizeof(struct ocfs2_xattr_entry) * start;
3292 memset((char *)xe, 0, len);
3294 le16_add_cpu(&xh->xh_count, -start);
3295 le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
3297 /* Calculate xh_free_start for the new bucket. */
3298 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
3299 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3300 xe = &xh->xh_entries[i];
3301 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3302 if (ocfs2_xattr_is_local(xe))
3304 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3306 xe_len += OCFS2_XATTR_ROOT_SIZE;
3307 if (le16_to_cpu(xe->xe_name_offset) <
3308 le16_to_cpu(xh->xh_free_start))
3309 xh->xh_free_start = xe->xe_name_offset;
3312 /* set xh->xh_num_buckets for the new xh. */
3313 if (new_bucket_head)
3314 xh->xh_num_buckets = cpu_to_le16(1);
3316 xh->xh_num_buckets = 0;
3318 for (i = 0; i < blk_per_bucket; i++) {
3319 ocfs2_journal_dirty(handle, t_bhs[i]);
3324 /* store the first_hash of the new bucket. */
3326 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3329 * Now only update the 1st block of the old bucket.
3330 * Please note that the entry has been sorted already above.
3332 xh = (struct ocfs2_xattr_header *)s_bhs[0]->b_data;
3333 memset(&xh->xh_entries[start], 0,
3334 sizeof(struct ocfs2_xattr_entry) * (count - start));
3335 xh->xh_count = cpu_to_le16(start);
3336 xh->xh_free_start = cpu_to_le16(name_offset);
3337 xh->xh_name_value_len = cpu_to_le16(name_value_len);
3339 ocfs2_journal_dirty(handle, s_bhs[0]);
3345 for (i = 0; i < blk_per_bucket; i++)
3351 for (i = 0; i < blk_per_bucket; i++)
3360 * Copy xattr from one bucket to another bucket.
3362 * The caller must make sure that the journal transaction
3363 * has enough space for journaling.
3365 static int ocfs2_cp_xattr_bucket(struct inode *inode,
3372 int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3373 int blocksize = inode->i_sb->s_blocksize;
3374 struct buffer_head **s_bhs, **t_bhs = NULL;
3376 BUG_ON(s_blkno == t_blkno);
3378 mlog(0, "cp bucket %llu to %llu, target is %d\n",
3379 s_blkno, t_blkno, t_is_new);
3381 s_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
3386 ret = ocfs2_read_xattr_bucket(inode, s_blkno, s_bhs, 0);
3390 t_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
3397 ret = ocfs2_read_xattr_bucket(inode, t_blkno, t_bhs, t_is_new);
3401 for (i = 0; i < blk_per_bucket; i++) {
3402 ret = ocfs2_journal_access(handle, inode, t_bhs[i],
3403 OCFS2_JOURNAL_ACCESS_WRITE);
3408 for (i = 0; i < blk_per_bucket; i++) {
3409 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);
3410 ocfs2_journal_dirty(handle, t_bhs[i]);
3415 for (i = 0; i < blk_per_bucket; i++)
3421 for (i = 0; i < blk_per_bucket; i++)
3430 * Copy one xattr cluster from src_blk to to_blk.
3431 * The to_blk will become the first bucket header of the cluster, so its
3432 * xh_num_buckets will be initialized as the bucket num in the cluster.
3434 static int ocfs2_cp_xattr_cluster(struct inode *inode,
3436 struct buffer_head *first_bh,
3441 int i, ret, credits;
3442 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3443 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3444 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
3445 struct buffer_head *bh = NULL;
3446 struct ocfs2_xattr_header *xh;
3447 u64 to_blk_start = to_blk;
3449 mlog(0, "cp xattrs from cluster %llu to %llu\n", src_blk, to_blk);
3452 * We need to update the new cluster and 1 more for the update of
3453 * the 1st bucket of the previous extent rec.
3456 ret = ocfs2_extend_trans(handle, credits);
3462 ret = ocfs2_journal_access(handle, inode, first_bh,
3463 OCFS2_JOURNAL_ACCESS_WRITE);
3469 for (i = 0; i < num_buckets; i++) {
3470 ret = ocfs2_cp_xattr_bucket(inode, handle,
3471 src_blk, to_blk, 1);
3477 src_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3478 to_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3481 /* update the old bucket header. */
3482 xh = (struct ocfs2_xattr_header *)first_bh->b_data;
3483 le16_add_cpu(&xh->xh_num_buckets, -num_buckets);
3485 ocfs2_journal_dirty(handle, first_bh);
3487 /* update the new bucket header. */
3488 ret = ocfs2_read_block(osb, to_blk_start, &bh, OCFS2_BH_CACHED, inode);
3494 ret = ocfs2_journal_access(handle, inode, bh,
3495 OCFS2_JOURNAL_ACCESS_WRITE);
3501 xh = (struct ocfs2_xattr_header *)bh->b_data;
3502 xh->xh_num_buckets = cpu_to_le16(num_buckets);
3504 ocfs2_journal_dirty(handle, bh);
3507 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3514 * Move half of the xattrs in this cluster to the new cluster.
3515 * This function should only be called when bucket size == cluster size.
3516 * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
3518 static int ocfs2_half_xattr_cluster(struct inode *inode,
3524 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3525 int ret, credits = 2 * blk_per_bucket;
3527 BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
3529 ret = ocfs2_extend_trans(handle, credits);
3535 /* Move half of the xattr in start_blk to the next bucket. */
3536 return ocfs2_half_xattr_bucket(inode, handle, prev_blk,
3537 new_blk, first_hash, 1);
3541 * Move some xattrs from the old cluster to the new one since they are not
3542 * contiguous in ocfs2 xattr tree.
3544 * new_blk starts a new separate cluster, and we will move some xattrs from
3545 * prev_blk to it. v_start will be set as the first name hash value in this
3546 * new cluster so that it can be used as e_cpos during tree insertion and
3547 * don't collide with our original b-tree operations. first_bh and header_bh
3548 * will also be updated since they will be used in ocfs2_extend_xattr_bucket
3549 * to extend the insert bucket.
3551 * The problem is how much xattr should we move to the new one and when should
3552 * we update first_bh and header_bh?
3553 * 1. If cluster size > bucket size, that means the previous cluster has more
3554 * than 1 bucket, so just move half nums of bucket into the new cluster and
3555 * update the first_bh and header_bh if the insert bucket has been moved
3556 * to the new cluster.
3557 * 2. If cluster_size == bucket_size:
3558 * a) If the previous extent rec has more than one cluster and the insert
3559 * place isn't in the last cluster, copy the entire last cluster to the
3560 * new one. This time, we don't need to upate the first_bh and header_bh
3561 * since they will not be moved into the new cluster.
3562 * b) Otherwise, move the bottom half of the xattrs in the last cluster into
3563 * the new one. And we set the extend flag to zero if the insert place is
3564 * moved into the new allocated cluster since no extend is needed.
3566 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
3568 struct buffer_head **first_bh,
3569 struct buffer_head **header_bh,
3577 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3579 mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n",
3580 prev_blk, prev_clusters, new_blk);
3582 if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1)
3583 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
3592 u64 last_blk = prev_blk + bpc * (prev_clusters - 1);
3594 if (prev_clusters > 1 && (*header_bh)->b_blocknr != last_blk)
3595 ret = ocfs2_cp_xattr_cluster(inode, handle, *first_bh,
3599 ret = ocfs2_half_xattr_cluster(inode, handle,
3603 if ((*header_bh)->b_blocknr == last_blk && extend)
3612 * Add a new cluster for xattr storage.
3614 * If the new cluster is contiguous with the previous one, it will be
3615 * appended to the same extent record, and num_clusters will be updated.
3616 * If not, we will insert a new extent for it and move some xattrs in
3617 * the last cluster into the new allocated one.
3618 * We also need to limit the maximum size of a btree leaf, otherwise we'll
3619 * lose the benefits of hashing because we'll have to search large leaves.
3620 * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
3623 * first_bh is the first block of the previous extent rec and header_bh
3624 * indicates the bucket we will insert the new xattrs. They will be updated
3625 * when the header_bh is moved into the new cluster.
3627 static int ocfs2_add_new_xattr_cluster(struct inode *inode,
3628 struct buffer_head *root_bh,
3629 struct buffer_head **first_bh,
3630 struct buffer_head **header_bh,
3637 u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3638 u32 prev_clusters = *num_clusters;
3639 u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
3641 handle_t *handle = NULL;
3642 struct ocfs2_alloc_context *data_ac = NULL;
3643 struct ocfs2_alloc_context *meta_ac = NULL;
3644 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3645 struct ocfs2_extent_tree et;
3647 mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, "
3648 "previous xattr blkno = %llu\n",
3649 (unsigned long long)OCFS2_I(inode)->ip_blkno,
3650 prev_cpos, prev_blkno);
3652 ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
3654 ret = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
3655 &data_ac, &meta_ac);
3661 credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el,
3663 handle = ocfs2_start_trans(osb, credits);
3664 if (IS_ERR(handle)) {
3665 ret = PTR_ERR(handle);
3671 ret = ocfs2_journal_access(handle, inode, root_bh,
3672 OCFS2_JOURNAL_ACCESS_WRITE);
3678 ret = __ocfs2_claim_clusters(osb, handle, data_ac, 1,
3679 clusters_to_add, &bit_off, &num_bits);
3686 BUG_ON(num_bits > clusters_to_add);
3688 block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
3689 mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n",
3690 num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
3692 if (prev_blkno + prev_clusters * bpc == block &&
3693 (prev_clusters + num_bits) << osb->s_clustersize_bits <=
3694 OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
3696 * If this cluster is contiguous with the old one and
3697 * adding this new cluster, we don't surpass the limit of
3698 * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
3699 * initialized and used like other buckets in the previous
3701 * So add it as a contiguous one. The caller will handle
3704 v_start = prev_cpos + prev_clusters;
3705 *num_clusters = prev_clusters + num_bits;
3706 mlog(0, "Add contiguous %u clusters to previous extent rec.\n",
3709 ret = ocfs2_adjust_xattr_cross_cluster(inode,
3724 if (handle->h_buffer_credits < credits) {
3726 * The journal has been restarted before, and don't
3727 * have enough space for the insertion, so extend it
3730 ret = ocfs2_extend_trans(handle, credits);
3736 mlog(0, "Insert %u clusters at block %llu for xattr at %u\n",
3737 num_bits, block, v_start);
3738 ret = ocfs2_insert_extent(osb, handle, inode, &et, v_start, block,
3739 num_bits, 0, meta_ac);
3745 ret = ocfs2_journal_dirty(handle, root_bh);
3753 ocfs2_commit_trans(osb, handle);
3755 ocfs2_free_alloc_context(data_ac);
3757 ocfs2_free_alloc_context(meta_ac);
3763 * Extend a new xattr bucket and move xattrs to the end one by one until
3764 * We meet with start_bh. Only move half of the xattrs to the bucket after it.
3766 static int ocfs2_extend_xattr_bucket(struct inode *inode,
3767 struct buffer_head *first_bh,
3768 struct buffer_head *start_bh,
3772 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3773 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3774 u64 start_blk = start_bh->b_blocknr, end_blk;
3775 u32 num_buckets = num_clusters * ocfs2_xattr_buckets_per_cluster(osb);
3777 struct ocfs2_xattr_header *first_xh =
3778 (struct ocfs2_xattr_header *)first_bh->b_data;
3779 u16 bucket = le16_to_cpu(first_xh->xh_num_buckets);
3781 mlog(0, "extend xattr bucket in %llu, xattr extend rec starting "
3782 "from %llu, len = %u\n", start_blk,
3783 (unsigned long long)first_bh->b_blocknr, num_clusters);
3785 BUG_ON(bucket >= num_buckets);
3787 end_blk = first_bh->b_blocknr + (bucket - 1) * blk_per_bucket;
3790 * We will touch all the buckets after the start_bh(include it).
3791 * Add one more bucket and modify the first_bh.
3793 credits = end_blk - start_blk + 2 * blk_per_bucket + 1;
3794 handle = ocfs2_start_trans(osb, credits);
3795 if (IS_ERR(handle)) {
3796 ret = PTR_ERR(handle);
3802 ret = ocfs2_journal_access(handle, inode, first_bh,
3803 OCFS2_JOURNAL_ACCESS_WRITE);
3809 while (end_blk != start_blk) {
3810 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
3811 end_blk + blk_per_bucket, 0);
3814 end_blk -= blk_per_bucket;
3817 /* Move half of the xattr in start_blk to the next bucket. */
3818 ret = ocfs2_half_xattr_bucket(inode, handle, start_blk,
3819 start_blk + blk_per_bucket, NULL, 0);
3821 le16_add_cpu(&first_xh->xh_num_buckets, 1);
3822 ocfs2_journal_dirty(handle, first_bh);
3825 ocfs2_commit_trans(osb, handle);
3831 * Add new xattr bucket in an extent record and adjust the buckets accordingly.
3832 * xb_bh is the ocfs2_xattr_block.
3833 * We will move all the buckets starting from header_bh to the next place. As
3834 * for this one, half num of its xattrs will be moved to the next one.
3836 * We will allocate a new cluster if current cluster is full and adjust
3837 * header_bh and first_bh if the insert place is moved to the new cluster.
3839 static int ocfs2_add_new_xattr_bucket(struct inode *inode,
3840 struct buffer_head *xb_bh,
3841 struct buffer_head *header_bh)
3843 struct ocfs2_xattr_header *first_xh = NULL;
3844 struct buffer_head *first_bh = NULL;
3845 struct ocfs2_xattr_block *xb =
3846 (struct ocfs2_xattr_block *)xb_bh->b_data;
3847 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3848 struct ocfs2_extent_list *el = &xb_root->xt_list;
3849 struct ocfs2_xattr_header *xh =
3850 (struct ocfs2_xattr_header *)header_bh->b_data;
3851 u32 name_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3852 struct super_block *sb = inode->i_sb;
3853 struct ocfs2_super *osb = OCFS2_SB(sb);
3854 int ret, num_buckets, extend = 1;
3856 u32 e_cpos, num_clusters;
3858 mlog(0, "Add new xattr bucket starting form %llu\n",
3859 (unsigned long long)header_bh->b_blocknr);
3862 * Add refrence for header_bh here because it may be
3863 * changed in ocfs2_add_new_xattr_cluster and we need
3864 * to free it in the end.
3868 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
3875 ret = ocfs2_read_block(osb, p_blkno,
3876 &first_bh, OCFS2_BH_CACHED, inode);
3882 num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
3883 first_xh = (struct ocfs2_xattr_header *)first_bh->b_data;
3885 if (num_buckets == le16_to_cpu(first_xh->xh_num_buckets)) {
3886 ret = ocfs2_add_new_xattr_cluster(inode,
3901 ret = ocfs2_extend_xattr_bucket(inode,
3913 static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode,
3914 struct ocfs2_xattr_bucket *bucket,
3917 int block_off = offs >> inode->i_sb->s_blocksize_bits;
3919 offs = offs % inode->i_sb->s_blocksize;
3920 return bucket->bhs[block_off]->b_data + offs;
3924 * Handle the normal xattr set, including replace, delete and new.
3926 * Note: "local" indicates the real data's locality. So we can't
3927 * just its bucket locality by its length.
3929 static void ocfs2_xattr_set_entry_normal(struct inode *inode,
3930 struct ocfs2_xattr_info *xi,
3931 struct ocfs2_xattr_search *xs,
3935 struct ocfs2_xattr_entry *last, *xe;
3936 int name_len = strlen(xi->name);
3937 struct ocfs2_xattr_header *xh = xs->header;
3938 u16 count = le16_to_cpu(xh->xh_count), start;
3939 size_t blocksize = inode->i_sb->s_blocksize;
3941 size_t offs, size, new_size;
3943 last = &xh->xh_entries[count];
3944 if (!xs->not_found) {
3946 offs = le16_to_cpu(xe->xe_name_offset);
3947 if (ocfs2_xattr_is_local(xe))
3948 size = OCFS2_XATTR_SIZE(name_len) +
3949 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3951 size = OCFS2_XATTR_SIZE(name_len) +
3952 OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
3955 * If the new value will be stored outside, xi->value has been
3956 * initalized as an empty ocfs2_xattr_value_root, and the same
3957 * goes with xi->value_len, so we can set new_size safely here.
3958 * See ocfs2_xattr_set_in_bucket.
3960 new_size = OCFS2_XATTR_SIZE(name_len) +
3961 OCFS2_XATTR_SIZE(xi->value_len);
3963 le16_add_cpu(&xh->xh_name_value_len, -size);
3965 if (new_size > size)
3966 goto set_new_name_value;
3968 /* Now replace the old value with new one. */
3970 xe->xe_value_size = cpu_to_le64(xi->value_len);
3972 xe->xe_value_size = 0;
3974 val = ocfs2_xattr_bucket_get_val(inode,
3976 memset(val + OCFS2_XATTR_SIZE(name_len), 0,
3977 size - OCFS2_XATTR_SIZE(name_len));
3978 if (OCFS2_XATTR_SIZE(xi->value_len) > 0)
3979 memcpy(val + OCFS2_XATTR_SIZE(name_len),
3980 xi->value, xi->value_len);
3982 le16_add_cpu(&xh->xh_name_value_len, new_size);
3983 ocfs2_xattr_set_local(xe, local);
3987 * Remove the old entry if there is more than one.
3988 * We don't remove the last entry so that we can
3989 * use it to indicate the hash value of the empty
3993 le16_add_cpu(&xh->xh_count, -1);
3996 (void *)last - (void *)xe);
3998 sizeof(struct ocfs2_xattr_entry));
4001 cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
4006 /* find a new entry for insert. */
4007 int low = 0, high = count - 1, tmp;
4008 struct ocfs2_xattr_entry *tmp_xe;
4010 while (low <= high && count) {
4011 tmp = (low + high) / 2;
4012 tmp_xe = &xh->xh_entries[tmp];
4014 if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
4016 else if (name_hash <
4017 le32_to_cpu(tmp_xe->xe_name_hash))
4025 xe = &xh->xh_entries[low];
4027 memmove(xe + 1, xe, (void *)last - (void *)xe);
4029 le16_add_cpu(&xh->xh_count, 1);
4030 memset(xe, 0, sizeof(struct ocfs2_xattr_entry));
4031 xe->xe_name_hash = cpu_to_le32(name_hash);
4032 xe->xe_name_len = name_len;
4033 ocfs2_xattr_set_type(xe, xi->name_index);
4037 /* Insert the new name+value. */
4038 size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len);
4041 * We must make sure that the name/value pair
4042 * exists in the same block.
4044 offs = le16_to_cpu(xh->xh_free_start);
4045 start = offs - size;
4047 if (start >> inode->i_sb->s_blocksize_bits !=
4048 (offs - 1) >> inode->i_sb->s_blocksize_bits) {
4049 offs = offs - offs % blocksize;
4050 xh->xh_free_start = cpu_to_le16(offs);
4053 val = ocfs2_xattr_bucket_get_val(inode,
4054 &xs->bucket, offs - size);
4055 xe->xe_name_offset = cpu_to_le16(offs - size);
4057 memset(val, 0, size);
4058 memcpy(val, xi->name, name_len);
4059 memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len);
4061 xe->xe_value_size = cpu_to_le64(xi->value_len);
4062 ocfs2_xattr_set_local(xe, local);
4064 le16_add_cpu(&xh->xh_free_start, -size);
4065 le16_add_cpu(&xh->xh_name_value_len, size);
4070 static int ocfs2_xattr_bucket_handle_journal(struct inode *inode,
4072 struct ocfs2_xattr_search *xs,
4073 struct buffer_head **bhs,
4076 int ret = 0, off, block_off;
4077 struct ocfs2_xattr_entry *xe = xs->here;
4080 * First calculate all the blocks we should journal_access
4081 * and journal_dirty. The first block should always be touched.
4083 ret = ocfs2_journal_dirty(handle, bhs[0]);
4087 /* calc the data. */
4088 off = le16_to_cpu(xe->xe_name_offset);
4089 block_off = off >> inode->i_sb->s_blocksize_bits;
4090 ret = ocfs2_journal_dirty(handle, bhs[block_off]);
4098 * Set the xattr entry in the specified bucket.
4099 * The bucket is indicated by xs->bucket and it should have the enough
4100 * space for the xattr insertion.
4102 static int ocfs2_xattr_set_entry_in_bucket(struct inode *inode,
4103 struct ocfs2_xattr_info *xi,
4104 struct ocfs2_xattr_search *xs,
4109 handle_t *handle = NULL;
4110 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4111 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4113 mlog(0, "Set xattr entry len = %lu index = %d in bucket %llu\n",
4114 (unsigned long)xi->value_len, xi->name_index,
4115 (unsigned long long)xs->bucket.bhs[0]->b_blocknr);
4117 if (!xs->bucket.bhs[1]) {
4118 ret = ocfs2_read_blocks(osb,
4119 xs->bucket.bhs[0]->b_blocknr + 1,
4120 blk_per_bucket - 1, &xs->bucket.bhs[1],
4121 OCFS2_BH_CACHED, inode);
4128 handle = ocfs2_start_trans(osb, blk_per_bucket);
4129 if (IS_ERR(handle)) {
4130 ret = PTR_ERR(handle);
4136 for (i = 0; i < blk_per_bucket; i++) {
4137 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[i],
4138 OCFS2_JOURNAL_ACCESS_WRITE);
4145 ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash, local);
4147 /*Only dirty the blocks we have touched in set xattr. */
4148 ret = ocfs2_xattr_bucket_handle_journal(inode, handle, xs,
4149 xs->bucket.bhs, blk_per_bucket);
4153 ocfs2_commit_trans(osb, handle);
4158 static int ocfs2_xattr_value_update_size(struct inode *inode,
4159 struct buffer_head *xe_bh,
4160 struct ocfs2_xattr_entry *xe,
4164 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4165 handle_t *handle = NULL;
4167 handle = ocfs2_start_trans(osb, 1);
4168 if (handle == NULL) {
4174 ret = ocfs2_journal_access(handle, inode, xe_bh,
4175 OCFS2_JOURNAL_ACCESS_WRITE);
4181 xe->xe_value_size = cpu_to_le64(new_size);
4183 ret = ocfs2_journal_dirty(handle, xe_bh);
4188 ocfs2_commit_trans(osb, handle);
4194 * Truncate the specified xe_off entry in xattr bucket.
4195 * bucket is indicated by header_bh and len is the new length.
4196 * Both the ocfs2_xattr_value_root and the entry will be updated here.
4198 * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
4200 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
4201 struct buffer_head *header_bh,
4207 struct buffer_head *value_bh = NULL;
4208 struct ocfs2_xattr_value_root *xv;
4209 struct ocfs2_xattr_entry *xe;
4210 struct ocfs2_xattr_header *xh =
4211 (struct ocfs2_xattr_header *)header_bh->b_data;
4212 size_t blocksize = inode->i_sb->s_blocksize;
4214 xe = &xh->xh_entries[xe_off];
4216 BUG_ON(!xe || ocfs2_xattr_is_local(xe));
4218 offset = le16_to_cpu(xe->xe_name_offset) +
4219 OCFS2_XATTR_SIZE(xe->xe_name_len);
4221 value_blk = offset / blocksize;
4223 /* We don't allow ocfs2_xattr_value to be stored in different block. */
4224 BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
4225 value_blk += header_bh->b_blocknr;
4227 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), value_blk,
4228 &value_bh, OCFS2_BH_CACHED, inode);
4234 xv = (struct ocfs2_xattr_value_root *)
4235 (value_bh->b_data + offset % blocksize);
4237 mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n",
4238 xe_off, (unsigned long long)header_bh->b_blocknr, len);
4239 ret = ocfs2_xattr_value_truncate(inode, value_bh, xv, len);
4245 ret = ocfs2_xattr_value_update_size(inode, header_bh, xe, len);
4256 static int ocfs2_xattr_bucket_value_truncate_xs(struct inode *inode,
4257 struct ocfs2_xattr_search *xs,
4261 struct ocfs2_xattr_entry *xe = xs->here;
4262 struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xs->base;
4264 BUG_ON(!xs->bucket.bhs[0] || !xe || ocfs2_xattr_is_local(xe));
4266 offset = xe - xh->xh_entries;
4267 ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket.bhs[0],
4275 static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode,
4276 struct ocfs2_xattr_search *xs,
4281 struct ocfs2_xattr_value_root *xv;
4282 struct ocfs2_xattr_entry *xe = xs->here;
4284 BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe));
4286 offset = le16_to_cpu(xe->xe_name_offset) +
4287 OCFS2_XATTR_SIZE(xe->xe_name_len);
4289 xv = (struct ocfs2_xattr_value_root *)(xs->base + offset);
4291 return __ocfs2_xattr_set_value_outside(inode, xv, val, value_len);
4294 static int ocfs2_rm_xattr_cluster(struct inode *inode,
4295 struct buffer_head *root_bh,
4301 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4302 struct inode *tl_inode = osb->osb_tl_inode;
4304 struct ocfs2_xattr_block *xb =
4305 (struct ocfs2_xattr_block *)root_bh->b_data;
4306 struct ocfs2_alloc_context *meta_ac = NULL;
4307 struct ocfs2_cached_dealloc_ctxt dealloc;
4308 struct ocfs2_extent_tree et;
4310 ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
4312 ocfs2_init_dealloc_ctxt(&dealloc);
4314 mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n",
4315 cpos, len, (unsigned long long)blkno);
4317 ocfs2_remove_xattr_clusters_from_cache(inode, blkno, len);
4319 ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
4325 mutex_lock(&tl_inode->i_mutex);
4327 if (ocfs2_truncate_log_needs_flush(osb)) {
4328 ret = __ocfs2_flush_truncate_log(osb);
4335 handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
4336 if (handle == NULL) {
4342 ret = ocfs2_journal_access(handle, inode, root_bh,
4343 OCFS2_JOURNAL_ACCESS_WRITE);
4349 ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
4356 le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
4358 ret = ocfs2_journal_dirty(handle, root_bh);
4364 ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
4369 ocfs2_commit_trans(osb, handle);
4371 ocfs2_schedule_truncate_log_flush(osb, 1);
4373 mutex_unlock(&tl_inode->i_mutex);
4376 ocfs2_free_alloc_context(meta_ac);
4378 ocfs2_run_deallocs(osb, &dealloc);
4383 static void ocfs2_xattr_bucket_remove_xs(struct inode *inode,
4384 struct ocfs2_xattr_search *xs)
4386 handle_t *handle = NULL;
4387 struct ocfs2_xattr_header *xh = xs->bucket.xh;
4388 struct ocfs2_xattr_entry *last = &xh->xh_entries[
4389 le16_to_cpu(xh->xh_count) - 1];
4392 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1);
4393 if (IS_ERR(handle)) {
4394 ret = PTR_ERR(handle);
4399 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[0],
4400 OCFS2_JOURNAL_ACCESS_WRITE);
4406 /* Remove the old entry. */
4407 memmove(xs->here, xs->here + 1,
4408 (void *)last - (void *)xs->here);
4409 memset(last, 0, sizeof(struct ocfs2_xattr_entry));
4410 le16_add_cpu(&xh->xh_count, -1);
4412 ret = ocfs2_journal_dirty(handle, xs->bucket.bhs[0]);
4416 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
4420 * Set the xattr name/value in the bucket specified in xs.
4422 * As the new value in xi may be stored in the bucket or in an outside cluster,
4423 * we divide the whole process into 3 steps:
4424 * 1. insert name/value in the bucket(ocfs2_xattr_set_entry_in_bucket)
4425 * 2. truncate of the outside cluster(ocfs2_xattr_bucket_value_truncate_xs)
4426 * 3. Set the value to the outside cluster(ocfs2_xattr_bucket_set_value_outside)
4427 * 4. If the clusters for the new outside value can't be allocated, we need
4428 * to free the xattr we allocated in set.
4430 static int ocfs2_xattr_set_in_bucket(struct inode *inode,
4431 struct ocfs2_xattr_info *xi,
4432 struct ocfs2_xattr_search *xs)
4436 char *val = (char *)xi->value;
4437 struct ocfs2_xattr_entry *xe = xs->here;
4438 u32 name_hash = ocfs2_xattr_hash_by_name(inode,
4439 xi->name_index, xi->name);
4441 if (!xs->not_found && !ocfs2_xattr_is_local(xe)) {
4443 * We need to truncate the xattr storage first.
4445 * If both the old and new value are stored to
4446 * outside block, we only need to truncate
4447 * the storage and then set the value outside.
4449 * If the new value should be stored within block,
4450 * we should free all the outside block first and
4451 * the modification to the xattr block will be done
4452 * by following steps.
4454 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
4455 value_len = xi->value_len;
4459 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
4465 goto set_value_outside;
4468 value_len = xi->value_len;
4469 /* So we have to handle the inside block change now. */
4470 if (value_len > OCFS2_XATTR_INLINE_SIZE) {
4472 * If the new value will be stored outside of block,
4473 * initalize a new empty value root and insert it first.
4476 xi->value = &def_xv;
4477 xi->value_len = OCFS2_XATTR_ROOT_SIZE;
4480 ret = ocfs2_xattr_set_entry_in_bucket(inode, xi, xs, name_hash, local);
4486 if (value_len <= OCFS2_XATTR_INLINE_SIZE)
4489 /* allocate the space now for the outside block storage. */
4490 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
4495 if (xs->not_found) {
4497 * We can't allocate enough clusters for outside
4498 * storage and we have allocated xattr already,
4499 * so need to remove it.
4501 ocfs2_xattr_bucket_remove_xs(inode, xs);
4507 ret = ocfs2_xattr_bucket_set_value_outside(inode, xs, val, value_len);
4512 /* check whether the xattr bucket is filled up with the same hash value. */
4513 static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
4514 struct ocfs2_xattr_bucket *bucket)
4516 struct ocfs2_xattr_header *xh = bucket->xh;
4518 if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
4519 xh->xh_entries[0].xe_name_hash) {
4520 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
4522 (unsigned long long)bucket->bhs[0]->b_blocknr,
4523 le32_to_cpu(xh->xh_entries[0].xe_name_hash));
4530 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
4531 struct ocfs2_xattr_info *xi,
4532 struct ocfs2_xattr_search *xs)
4534 struct ocfs2_xattr_header *xh;
4535 struct ocfs2_xattr_entry *xe;
4536 u16 count, header_size, xh_free_start;
4537 int i, free, max_free, need, old;
4538 size_t value_size = 0, name_len = strlen(xi->name);
4539 size_t blocksize = inode->i_sb->s_blocksize;
4540 int ret, allocation = 0;
4541 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4543 mlog_entry("Set xattr %s in xattr index block\n", xi->name);
4547 count = le16_to_cpu(xh->xh_count);
4548 xh_free_start = le16_to_cpu(xh->xh_free_start);
4549 header_size = sizeof(struct ocfs2_xattr_header) +
4550 count * sizeof(struct ocfs2_xattr_entry);
4551 max_free = OCFS2_XATTR_BUCKET_SIZE -
4552 le16_to_cpu(xh->xh_name_value_len) - header_size;
4554 mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size "
4555 "of %u which exceed block size\n",
4556 (unsigned long long)xs->bucket.bhs[0]->b_blocknr,
4559 if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE)
4560 value_size = OCFS2_XATTR_ROOT_SIZE;
4562 value_size = OCFS2_XATTR_SIZE(xi->value_len);
4565 need = sizeof(struct ocfs2_xattr_entry) +
4566 OCFS2_XATTR_SIZE(name_len) + value_size;
4568 need = value_size + OCFS2_XATTR_SIZE(name_len);
4571 * We only replace the old value if the new length is smaller
4572 * than the old one. Otherwise we will allocate new space in the
4573 * bucket to store it.
4576 if (ocfs2_xattr_is_local(xe))
4577 old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
4579 old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
4581 if (old >= value_size)
4585 free = xh_free_start - header_size;
4587 * We need to make sure the new name/value pair
4588 * can exist in the same block.
4590 if (xh_free_start % blocksize < need)
4591 free -= xh_free_start % blocksize;
4593 mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, "
4594 "need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len ="
4595 " %u\n", xs->not_found,
4596 (unsigned long long)xs->bucket.bhs[0]->b_blocknr,
4597 free, need, max_free, le16_to_cpu(xh->xh_free_start),
4598 le16_to_cpu(xh->xh_name_value_len));
4600 if (free < need || count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
4601 if (need <= max_free &&
4602 count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
4604 * We can create the space by defragment. Since only the
4605 * name/value will be moved, the xe shouldn't be changed
4608 ret = ocfs2_defrag_xattr_bucket(inode, &xs->bucket);
4614 xh_free_start = le16_to_cpu(xh->xh_free_start);
4615 free = xh_free_start - header_size;
4616 if (xh_free_start % blocksize < need)
4617 free -= xh_free_start % blocksize;
4622 mlog(0, "Can't get enough space for xattr insert by "
4623 "defragment. Need %u bytes, but we have %d, so "
4624 "allocate new bucket for it.\n", need, free);
4628 * We have to add new buckets or clusters and one
4629 * allocation should leave us enough space for insert.
4634 * We do not allow for overlapping ranges between buckets. And
4635 * the maximum number of collisions we will allow for then is
4636 * one bucket's worth, so check it here whether we need to
4637 * add a new bucket for the insert.
4639 ret = ocfs2_check_xattr_bucket_collision(inode, &xs->bucket);
4645 ret = ocfs2_add_new_xattr_bucket(inode,
4653 for (i = 0; i < blk_per_bucket; i++)
4654 brelse(xs->bucket.bhs[i]);
4656 memset(&xs->bucket, 0, sizeof(xs->bucket));
4658 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
4661 if (ret && ret != -ENODATA)
4663 xs->not_found = ret;
4669 ret = ocfs2_xattr_set_in_bucket(inode, xi, xs);
4675 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
4676 struct ocfs2_xattr_bucket *bucket,
4680 struct ocfs2_xattr_header *xh = bucket->xh;
4682 struct ocfs2_xattr_entry *xe;
4684 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
4685 xe = &xh->xh_entries[i];
4686 if (ocfs2_xattr_is_local(xe))
4689 ret = ocfs2_xattr_bucket_value_truncate(inode,
4701 static int ocfs2_delete_xattr_index_block(struct inode *inode,
4702 struct buffer_head *xb_bh)
4704 struct ocfs2_xattr_block *xb =
4705 (struct ocfs2_xattr_block *)xb_bh->b_data;
4706 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
4708 u32 name_hash = UINT_MAX, e_cpos, num_clusters;
4711 if (le16_to_cpu(el->l_next_free_rec) == 0)
4714 while (name_hash > 0) {
4715 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
4716 &e_cpos, &num_clusters, el);
4722 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
4723 ocfs2_delete_xattr_in_bucket,
4730 ret = ocfs2_rm_xattr_cluster(inode, xb_bh,
4731 p_blkno, e_cpos, num_clusters);
4740 name_hash = e_cpos - 1;
4748 * 'trusted' attributes support
4751 #define XATTR_TRUSTED_PREFIX "trusted."
4753 static size_t ocfs2_xattr_trusted_list(struct inode *inode, char *list,
4754 size_t list_size, const char *name,
4757 const size_t prefix_len = sizeof(XATTR_TRUSTED_PREFIX) - 1;
4758 const size_t total_len = prefix_len + name_len + 1;
4760 if (list && total_len <= list_size) {
4761 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
4762 memcpy(list + prefix_len, name, name_len);
4763 list[prefix_len + name_len] = '\0';
4768 static int ocfs2_xattr_trusted_get(struct inode *inode, const char *name,
4769 void *buffer, size_t size)
4771 if (strcmp(name, "") == 0)
4773 return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_TRUSTED, name,
4777 static int ocfs2_xattr_trusted_set(struct inode *inode, const char *name,
4778 const void *value, size_t size, int flags)
4780 if (strcmp(name, "") == 0)
4783 return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_TRUSTED, name, value,
4787 struct xattr_handler ocfs2_xattr_trusted_handler = {
4788 .prefix = XATTR_TRUSTED_PREFIX,
4789 .list = ocfs2_xattr_trusted_list,
4790 .get = ocfs2_xattr_trusted_get,
4791 .set = ocfs2_xattr_trusted_set,
4796 * 'user' attributes support
4799 #define XATTR_USER_PREFIX "user."
4801 static size_t ocfs2_xattr_user_list(struct inode *inode, char *list,
4802 size_t list_size, const char *name,
4805 const size_t prefix_len = sizeof(XATTR_USER_PREFIX) - 1;
4806 const size_t total_len = prefix_len + name_len + 1;
4807 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4809 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
4812 if (list && total_len <= list_size) {
4813 memcpy(list, XATTR_USER_PREFIX, prefix_len);
4814 memcpy(list + prefix_len, name, name_len);
4815 list[prefix_len + name_len] = '\0';
4820 static int ocfs2_xattr_user_get(struct inode *inode, const char *name,
4821 void *buffer, size_t size)
4823 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4825 if (strcmp(name, "") == 0)
4827 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
4829 return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_USER, name,
4833 static int ocfs2_xattr_user_set(struct inode *inode, const char *name,
4834 const void *value, size_t size, int flags)
4836 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4838 if (strcmp(name, "") == 0)
4840 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
4843 return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_USER, name, value,
4847 struct xattr_handler ocfs2_xattr_user_handler = {
4848 .prefix = XATTR_USER_PREFIX,
4849 .list = ocfs2_xattr_user_list,
4850 .get = ocfs2_xattr_user_get,
4851 .set = ocfs2_xattr_user_set,