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xfs: evict CoW fork extents when performing finsert/fcollapse 

When we perform an finsert/fcollapse operation, cancel all the CoW
extents for the affected file offset range so that they don't end up
pointing to the wrong blocks.

Reported-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Darrick J. Wong 2017-09-18 09:41:17 -07:00
parent cc6f77710a
commit 3af423b034
1 changed files with 13 additions and 1 deletions
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14
fs/xfs/xfs_bmap_util.c
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@ -1459,7 +1459,19 @@ xfs_shift_file_space(
return error;
/*
* The extent shiting code works on extent granularity. So, if
* Clean out anything hanging around in the cow fork now that
* we've flushed all the dirty data out to disk to avoid having
* CoW extents at the wrong offsets.
*/
if (xfs_is_reflink_inode(ip)) {
error = xfs_reflink_cancel_cow_range(ip, offset, NULLFILEOFF,
true);
if (error)
return error;
}
/*
* The extent shifting code works on extent granularity. So, if
* stop_fsb is not the starting block of extent, we need to split
* the extent at stop_fsb.
*/