Nik Markovic wrote:
> Hi All,
>
> I have been encountering consistent btrfs filesystem crashes when
> using cp –reflink=always on a large file and modifying it. I believe
> that the test file needs to be fairly large as I was not able to
> reproduce with smaller files. The filesystem size is 45GB and file
> size is 10GB.
>
It should be fixed in 3.1 by this commit:
commit b6f3409b2197e8fcedb43e6600e37b7cfbe0715b
Author: Sage Weil <sage@xxxxxxxxxxxx>
Date: Tue Sep 20 14:48:51 2011 -0400
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
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