Commit b6f3409b authored Sep 20, 2011 by Sage Weil Committed by Chris Mason Sep 20, 2011

Btrfs: reserve sufficient space for ioctl clone



Fix a crash/BUG_ON in the clone ioctl due to insufficient reservation. We
need to reserve space for:

 - adjusting the old extent (possibly splitting it)
 - adding the new extent
 - updating the inode

Signed-off-by: Sage Weil <sage@newdream.net>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

parent dde820fb

fs/btrfs/ioctl.c

+6 −1

Original line number	Diff line number	Diff line
		@@ -2336,7 +2336,12 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
		else
		new_key.offset = destoff;

		trans = btrfs_start_transaction(root, 1);
		/*
		* 1 - adjusting old extent (we may have to split it)
		* 1 - add new extent
		* 1 - inode update
		*/
		trans = btrfs_start_transaction(root, 3);
		if (IS_ERR(trans)) {
		ret = PTR_ERR(trans);
		goto out;