consequences of XFS_IOC_FSSETXATTR on non-empty file?

[Dave Chinner]

On Sat, Jul 12, 2014 at 06:16:54PM -0700, Samuel Just wrote:
> Hi,
> 
> We are seeing reports of ceph-osd stores on xfs of files with some
> garbage data (possibly misplaced from data elsewhere in the
> filesystem).  There was a bug for a while where the ceph-osd process
> would set a value for fsx_extsize on a non-empty (possibly sparse)
> file using XFS_IOC_FSSETXATTR.  Could that plausibly result in a file
> with garbage data? 

No, setting an extent size on a non-empty file will simply fail
with EINVAL.

Do you have any method of reproducing the bad data in files?

Cheers,

Dave.
-- 
Dave Chinner
david at fromorbit.com