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authorYan, Zheng <zheng.yan@oracle.com>2010-05-16 10:48:46 -0400
committerChris Mason <chris.mason@oracle.com>2010-05-25 10:34:50 -0400
commita22285a6a32390195235171b89d157ed1a1fe932 (patch)
tree3fabc88a029e1af4f2fdcc708e7b62ef3cf3703a /fs/btrfs/inode-item.c
parentf0486c68e4bd9a06a5904d3eeb3a0d73a83befb8 (diff)
downloadblackbird-op-linux-a22285a6a32390195235171b89d157ed1a1fe932.tar.gz
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Btrfs: Integrate metadata reservation with start_transaction
Besides simplify the code, this change makes sure all metadata reservation for normal metadata operations are released after committing transaction. Changes since V1: Add code that check if unlink and rmdir will free space. Add ENOSPC handling for clone ioctl. Signed-off-by: Yan Zheng <zheng.yan@oracle.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/inode-item.c')
-rw-r--r--fs/btrfs/inode-item.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/fs/btrfs/inode-item.c b/fs/btrfs/inode-item.c
index 72ce3c173d6a..64f1150bb48d 100644
--- a/fs/btrfs/inode-item.c
+++ b/fs/btrfs/inode-item.c
@@ -49,6 +49,33 @@ static int find_name_in_backref(struct btrfs_path *path, const char *name,
return 0;
}
+struct btrfs_inode_ref *
+btrfs_lookup_inode_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ const char *name, int name_len,
+ u64 inode_objectid, u64 ref_objectid, int mod)
+{
+ struct btrfs_key key;
+ struct btrfs_inode_ref *ref;
+ int ins_len = mod < 0 ? -1 : 0;
+ int cow = mod != 0;
+ int ret;
+
+ key.objectid = inode_objectid;
+ key.type = BTRFS_INODE_REF_KEY;
+ key.offset = ref_objectid;
+
+ ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
+ if (ret < 0)
+ return ERR_PTR(ret);
+ if (ret > 0)
+ return NULL;
+ if (!find_name_in_backref(path, name, name_len, &ref))
+ return NULL;
+ return ref;
+}
+
int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
const char *name, int name_len,
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