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Btrfs: fix arithmetic error in clone ioctl

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Fix an arithmetic error that was breaking extents cloned via the clone
ioctl starting in the second half of a file.

Signed-off-by: Sage Weil <sage@newdream.net>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Sage Weil
2009-09-21 16:00:27 -04:00
committed by Chris Mason
parent 76dda93c6a
commit 1fb58a6051
1 changed files with 1 additions and 2 deletions
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3
fs/btrfs/ioctl.c
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@@ -1105,8 +1105,7 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
datao += off - key.offset; datao += off - key.offset;
datal -= off - key.offset; datal -= off - key.offset;
} }
if (key.offset + datao + datal + key.offset > if (key.offset + datao + datal > off + len)
off + len)
datal = off + len - key.offset - datao; datal = off + len - key.offset - datao;
/* disko == 0 means it's a hole */ /* disko == 0 means it's a hole */
if (!disko) if (!disko)