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Btrfs: reserve sufficient space for ioctl clone

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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>
This commit is contained in:
Sage Weil 2011-09-20 14:48:51 -04:00 committed by Chris Mason
parent dde820fbf7
commit b6f3409b21
1 changed files with 6 additions and 1 deletions
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7
fs/btrfs/ioctl.c
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@ -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;