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xfs: introduce a new xfs_inode_has_cow_data helper

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We have a few places that already check if an inode has actual data in
the COW fork to avoid work on reflink inodes that do not actually have
outstanding COW blocks.  There are a few more places that can avoid
working if doing the same check, so add a documented helper for this
condition and use it in all places where it makes sense.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig 2018-07-17 16:51:51 -07:00 • committed by Darrick J. Wong
parent 3ba738df25
commit 51d6269030
6 changed files with 18 additions and 12 deletions
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2
fs/xfs/xfs_reflink.c
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@ -478,7 +478,7 @@ xfs_reflink_cancel_cow_blocks(
struct xfs_iext_cursor icur;
int error = 0;
if (!xfs_is_reflink_inode(ip))
if (!xfs_inode_has_cow_data(ip))
return 0;
if (!xfs_iext_lookup_extent_before(ip, ifp, &end_fsb, &icur, &got))
return 0;