Commit 4d728ec7 authored Jan 26, 2011 by 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: Li Zefan <lizf@cn.fujitsu.com>

parent b897abec

fs/btrfs/ioctl.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -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;
		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)) {

Admin message