/*
* Check whether the hash of the last entry in our
- * bucket is larger than the search one.
+ * bucket is larger than the search one. for an empty
+ * bucket, the last one is also the first one.
*/
- xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
+ if (xh->xh_count)
+ xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
+
last_hash = le32_to_cpu(xe->xe_name_hash);
/* record lower_bh which may be the insert place. */
if (i == 0)
num_buckets = le16_to_cpu(bucket.xh->xh_num_buckets);
- mlog(0, "iterating xattr bucket %llu\n", blkno);
+ mlog(0, "iterating xattr bucket %llu, first hash %u\n", blkno,
+ le32_to_cpu(bucket.xh->xh_entries[0].xe_name_hash));
if (func) {
ret = func(inode, &bucket, para);
if (ret) {
/*
* Handle the normal xattr set, including replace, delete and new.
- * When the bucket is empty, "is_empty" is set and the caller can
- * free this bucket.
*
* Note: "local" indicates the real data's locality. So we can't
* just its bucket locality by its length.
struct ocfs2_xattr_info *xi,
struct ocfs2_xattr_search *xs,
u32 name_hash,
- int local,
- int *is_empty)
+ int local)
{
struct ocfs2_xattr_entry *last, *xe;
int name_len = strlen(xi->name);
ocfs2_xattr_set_local(xe, local);
return;
} else {
- /* Remove the old entry. */
+ /*
+ * Remove the old entry if there is more than one.
+ * We don't remove the last entry so that we can
+ * use it to indicate the hash value of the empty
+ * bucket.
+ */
last -= 1;
- memmove(xe, xe + 1,
- (void *)last - (void *)xe);
- memset(last, 0, sizeof(struct ocfs2_xattr_entry));
le16_add_cpu(&xh->xh_count, -1);
- if (xh->xh_count == 0 && is_empty)
- *is_empty = 1;
+ if (xh->xh_count) {
+ memmove(xe, xe + 1,
+ (void *)last - (void *)xe);
+ memset(last, 0,
+ sizeof(struct ocfs2_xattr_entry));
+ } else
+ xh->xh_free_start =
+ cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
+
return;
}
} else {
int low = 0, high = count - 1, tmp;
struct ocfs2_xattr_entry *tmp_xe;
- while (low <= high) {
+ while (low <= high && count) {
tmp = (low + high) / 2;
tmp_xe = &xh->xh_entries[tmp];
struct ocfs2_xattr_info *xi,
struct ocfs2_xattr_search *xs,
u32 name_hash,
- int local,
- int *bucket_empty)
+ int local)
{
int i, ret;
handle_t *handle = NULL;
}
}
- ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash,
- local, bucket_empty);
+ ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash, local);
/*Only dirty the blocks we have touched in set xattr. */
ret = ocfs2_xattr_bucket_handle_journal(inode, handle, xs,
return __ocfs2_xattr_set_value_outside(inode, xv, val, value_len);
}
-/*
- * Remove the xattr bucket pointed by bucket_bh.
- * All the buckets after it in the same xattr extent rec will be
- * move forward one by one.
- */
-static int ocfs2_rm_xattr_bucket(struct inode *inode,
- struct buffer_head *first_bh,
- struct ocfs2_xattr_bucket *bucket)
-{
- int ret = 0, credits;
- struct ocfs2_xattr_header *xh =
- (struct ocfs2_xattr_header *)first_bh->b_data;
- u16 bucket_num = le16_to_cpu(xh->xh_num_buckets);
- u64 end, start = bucket->bhs[0]->b_blocknr;
- struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
- handle_t *handle;
- u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
-
- end = first_bh->b_blocknr + (bucket_num - 1) * blk_per_bucket;
-
- mlog(0, "rm xattr bucket %llu\n", start);
- /*
- * We need to update the first xattr_header and all the buckets starting
- * from start in this xattr rec.
- *
- * XXX: Should we empty the old last bucket here?
- */
- credits = 1 + end - start;
- handle = ocfs2_start_trans(osb, credits);
- if (IS_ERR(handle)) {
- ret = PTR_ERR(handle);
- mlog_errno(ret);
- return ret;
- }
-
- ret = ocfs2_journal_access(handle, inode, first_bh,
- OCFS2_JOURNAL_ACCESS_WRITE);
- if (ret) {
- mlog_errno(ret);
- goto out_commit;
- }
-
-
- while (start < end) {
- ret = ocfs2_cp_xattr_bucket(inode, handle,
- start + blk_per_bucket,
- start, 0);
- if (ret) {
- mlog_errno(ret);
- goto out_commit;
- }
- start += blk_per_bucket;
- }
-
- /* update the first_bh. */
- xh->xh_num_buckets = cpu_to_le16(bucket_num - 1);
- ocfs2_journal_dirty(handle, first_bh);
-
-out_commit:
- ocfs2_commit_trans(osb, handle);
- return ret;
-}
-
static int ocfs2_rm_xattr_cluster(struct inode *inode,
struct buffer_head *root_bh,
u64 blkno,
return ret;
}
-/*
- * Free the xattr bucket indicated by xs->bucket and if all the buckets
- * in the clusters is free, free the clusters also.
- */
-static int ocfs2_xattr_bucket_shrink(struct inode *inode,
- struct ocfs2_xattr_info *xi,
- struct ocfs2_xattr_search *xs,
- u32 name_hash)
-{
- int ret;
- u32 e_cpos, num_clusters;
- u64 p_blkno;
- struct buffer_head *first_bh = NULL;
- struct ocfs2_xattr_header *first_xh;
- struct ocfs2_xattr_block *xb =
- (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
-
- BUG_ON(xs->header->xh_count != 0);
-
- ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
- &e_cpos, &num_clusters,
- &xb->xb_attrs.xb_root.xt_list);
- if (ret) {
- mlog_errno(ret);
- return ret;
- }
-
- ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), p_blkno,
- &first_bh, OCFS2_BH_CACHED, inode);
- if (ret) {
- mlog_errno(ret);
- return ret;
- }
-
- ret = ocfs2_rm_xattr_bucket(inode, first_bh, &xs->bucket);
- if (ret) {
- mlog_errno(ret);
- goto out;
- }
-
- first_xh = (struct ocfs2_xattr_header *)first_bh->b_data;
- if (first_xh->xh_num_buckets == 0)
- ret = ocfs2_rm_xattr_cluster(inode, xs->xattr_bh,
- p_blkno, e_cpos,
- num_clusters);
-
-out:
- brelse(first_bh);
- return ret;
-}
-
static void ocfs2_xattr_bucket_remove_xs(struct inode *inode,
struct ocfs2_xattr_search *xs)
{
struct ocfs2_xattr_info *xi,
struct ocfs2_xattr_search *xs)
{
- int ret, local = 1, bucket_empty = 0;
+ int ret, local = 1;
size_t value_len;
char *val = (char *)xi->value;
struct ocfs2_xattr_entry *xe = xs->here;
xi->value_len = OCFS2_XATTR_ROOT_SIZE;
}
- ret = ocfs2_xattr_set_entry_in_bucket(inode, xi, xs, name_hash,
- local, &bucket_empty);
+ ret = ocfs2_xattr_set_entry_in_bucket(inode, xi, xs, name_hash, local);
if (ret) {
mlog_errno(ret);
goto out;
}
- if (value_len > OCFS2_XATTR_INLINE_SIZE) {
- /* allocate the space now for the outside block storage. */
- ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
- value_len);
- if (ret) {
- mlog_errno(ret);
+ if (value_len <= OCFS2_XATTR_INLINE_SIZE)
+ goto out;
- if (xs->not_found) {
- /*
- * We can't allocate enough clusters for outside
- * storage and we have allocated xattr already,
- * so need to remove it.
- */
- ocfs2_xattr_bucket_remove_xs(inode, xs);
- }
- goto out;
+ /* allocate the space now for the outside block storage. */
+ ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
+ value_len);
+ if (ret) {
+ mlog_errno(ret);
+
+ if (xs->not_found) {
+ /*
+ * We can't allocate enough clusters for outside
+ * storage and we have allocated xattr already,
+ * so need to remove it.
+ */
+ ocfs2_xattr_bucket_remove_xs(inode, xs);
}
- } else {
- if (bucket_empty)
- ret = ocfs2_xattr_bucket_shrink(inode, xi,
- xs, name_hash);
goto out;
}
projects / platform / kernel / linux-3.10.git / commitdiff