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authorYan, Zheng <zheng.yan@oracle.com>2009-11-12 09:33:58 +0000
committerChris Mason <chris.mason@oracle.com>2009-12-15 21:24:25 -0500
commitad48fd754676bfae4139be1a897b1ea58f9aaf21 (patch)
treea48a051fa8716ba4be8f148f6d7d8ca47d93ab07 /fs/btrfs/ctree.h
parent8cef4e160d74920ad1725f58c89fd75ec4c4ac38 (diff)
Btrfs: Add btrfs_duplicate_item
btrfs_duplicate_item duplicates item with new key, guaranteeing the source item and the new items are in the same tree leaf and contiguous. It allows us to split file extent in place, without using lock_extent to prevent bookend extent race. Signed-off-by: Yan Zheng <zheng.yan@oracle.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/ctree.h')
-rw-r--r--fs/btrfs/ctree.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 444b3e9b92a..e3b58001162 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -2089,6 +2089,10 @@ int btrfs_split_item(struct btrfs_trans_handle *trans,
struct btrfs_path *path,
struct btrfs_key *new_key,
unsigned long split_offset);
+int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ struct btrfs_key *new_key);
int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_key *key, struct btrfs_path *p, int
ins_len, int cow);