Commit 4d728ec7 authored by Li Zefan's avatar Li Zefan

Btrfs: Fix file clone when source offset is not 0

Suppose:
- the source extent is: [0, 100]
- the src offset is 10
- the clone length is 90
- the dest offset is 0

This statement:

	new_key.offset = key.offset + destoff - off

will produce such an extent for the dest file:

	[ino, BTRFS_EXTENT_DATA_KEY, -10]

, which is obviously wrong.
Signed-off-by: default avatarLi Zefan <lizf@cn.fujitsu.com>
parent b897abec
......@@ -1788,7 +1788,10 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
memcpy(&new_key, &key, sizeof(new_key));
new_key.objectid = inode->i_ino;
new_key.offset = key.offset + destoff - off;
if (off <= key.offset)
new_key.offset = key.offset + destoff - off;
else
new_key.offset = destoff;
trans = btrfs_start_transaction(root, 1);
if (IS_ERR(trans)) {
......
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