xfs: hide xfs_icache_free_cowblocks

Change the one remaining caller of xfs_icache_free_cowblocks to use our
new combined blockgc scan function instead, since we will soon be
combining the two scans.  This introduces a slight behavior change,
since a readonly remount now clears out post-EOF preallocations and not
just CoW staging extents.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>

fs/xfs/xfs_icache.c

@@ -1567,7 +1567,7 @@ xfs_inode_free_cowblocks(
 	return ret;
 }
 
-int
+static int
 xfs_icache_free_cowblocks(
 	struct xfs_mount	*mp,
 	struct xfs_eofblocks	*eofb)

fs/xfs/xfs_icache.h

@@ -67,7 +67,6 @@ void xfs_queue_eofblocks(struct xfs_mount *);
 
 void xfs_inode_set_cowblocks_tag(struct xfs_inode *ip);
 void xfs_inode_clear_cowblocks_tag(struct xfs_inode *ip);
-int xfs_icache_free_cowblocks(struct xfs_mount *, struct xfs_eofblocks *);
 void xfs_cowblocks_worker(struct work_struct *);
 void xfs_queue_cowblocks(struct xfs_mount *);
 

fs/xfs/xfs_super.c

@@ -1713,7 +1713,7 @@ xfs_remount_ro(
 	xfs_stop_block_reaping(mp);
 
 	/* Get rid of any leftover CoW reservations... */
-	error = xfs_icache_free_cowblocks(mp, NULL);
+	error = xfs_blockgc_free_space(mp, NULL);
 	if (error) {
 		xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
 		return error;