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xfs: adjust refcount when unmapping file blocks

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When we're unmapping blocks from a reflinked file, decrease the
refcount of the affected blocks and free the extents that are no
longer in use.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2016-10-03 09:11:23 -07:00
parent 33ba612920
commit 62aab20f08
1 changed files with 11 additions and 3 deletions
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14
fs/xfs/libxfs/xfs_bmap.c
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@ -48,6 +48,7 @@
#include "xfs_filestream.h"
#include "xfs_rmap.h"
#include "xfs_ag_resv.h"
#include "xfs_refcount.h"
kmem_zone_t *xfs_bmap_free_item_zone;
@ -4988,9 +4989,16 @@ xfs_bmap_del_extent(
/*
* If we need to, add to list of extents to delete.
*/
if (do_fx)
xfs_bmap_add_free(mp, dfops, del->br_startblock,
del->br_blockcount, NULL);
if (do_fx) {
if (xfs_is_reflink_inode(ip) && whichfork == XFS_DATA_FORK) {
error = xfs_refcount_decrease_extent(mp, dfops, del);
if (error)
goto done;
} else
xfs_bmap_add_free(mp, dfops, del->br_startblock,
del->br_blockcount, NULL);
}
/*
* Adjust inode # blocks in the file.
*/