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xfs: check for cow blocks before trying to clear them

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There's no point in allocating a transaction and locking the inode in
preparation to clear cow blocks if there actually are any cow fork
extents.  Therefore, move the xfs_reflink_cancel_cow_range hunk to
xfs_inactive and check the cow ifp first.  This makes inode reclamation
run faster.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
This commit is contained in:
Darrick J. Wong
2018-03-06 17:08:31 -08:00
parent 3f883f5bb1
commit 6231848c3a
2 changed files with 5 additions and 9 deletions
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5
fs/xfs/xfs_inode.c
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@@ -1872,6 +1872,7 @@ xfs_inactive(
xfs_inode_t *ip)
{
struct xfs_mount *mp;
struct xfs_ifork *cow_ifp = XFS_IFORK_PTR(ip, XFS_COW_FORK);
int error;
int truncate = 0;
@@ -1892,6 +1893,10 @@ xfs_inactive(
if (mp->m_flags & XFS_MOUNT_RDONLY)
return;
/* Try to clean out the cow blocks if there are any. */
if (xfs_is_reflink_inode(ip) && cow_ifp->if_bytes > 0)
xfs_reflink_cancel_cow_range(ip, 0, NULLFILEOFF, true);
if (VFS_I(ip)->i_nlink != 0) {
/*
* force is true because we are evicting an inode from the