[PATCH 12/18] xfs: refactor reflink flag handling in xfs_swap_extent_forks

["Darrick J. Wong" <djwong@xxxxxxxxxx>]

From: Darrick J. Wong <djwong@xxxxxxxxxx>

Refactor the old data fork swap function to use the new reflink flag
helpers to propagate reflink flags between the two files.

Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
 fs/xfs/xfs_bmap_util.c |   58 +++++++++++++-----------------------------------
 1 file changed, 16 insertions(+), 42 deletions(-)


diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index bff8725082e8..7cd6a6d5fb00 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -1404,17 +1404,21 @@ xfs_swap_change_owner(
 STATIC int
 xfs_swap_extent_forks(
 	struct xfs_trans	**tpp,
-	struct xfs_inode	*ip,
-	struct xfs_inode	*tip)
+	struct xfs_swapext_req	*req)
 {
+	struct xfs_inode	*ip = req->ip1;
+	struct xfs_inode	*tip = req->ip2;
 	xfs_filblks_t		aforkblks = 0;
 	xfs_filblks_t		taforkblks = 0;
 	xfs_extnum_t		junk;
 	uint64_t		tmp;
+	unsigned int		reflink_state;
 	int			src_log_flags = XFS_ILOG_CORE;
 	int			target_log_flags = XFS_ILOG_CORE;
 	int			error;
 
+	reflink_state = xfs_swapext_reflink_prep(req);
+
 	/*
 	 * Count the number of extended attribute blocks
 	 */
@@ -1494,36 +1498,7 @@ xfs_swap_extent_forks(
 		break;
 	}
 
-	/* Do we have to swap reflink flags? */
-	if ((ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK) ^
-	    (tip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK)) {
-		uint64_t	f;
-
-		f = ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK;
-		ip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK;
-		ip->i_d.di_flags2 |= tip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK;
-		tip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK;
-		tip->i_d.di_flags2 |= f & XFS_DIFLAG2_REFLINK;
-	}
-
-	/* Swap the cow forks. */
-	if (xfs_sb_version_hasreflink(&ip->i_mount->m_sb)) {
-		ASSERT(!ip->i_cowfp ||
-		       ip->i_cowfp->if_format == XFS_DINODE_FMT_EXTENTS);
-		ASSERT(!tip->i_cowfp ||
-		       tip->i_cowfp->if_format == XFS_DINODE_FMT_EXTENTS);
-
-		swap(ip->i_cowfp, tip->i_cowfp);
-
-		if (ip->i_cowfp && ip->i_cowfp->if_bytes)
-			xfs_inode_set_cowblocks_tag(ip);
-		else
-			xfs_inode_clear_cowblocks_tag(ip);
-		if (tip->i_cowfp && tip->i_cowfp->if_bytes)
-			xfs_inode_set_cowblocks_tag(tip);
-		else
-			xfs_inode_clear_cowblocks_tag(tip);
-	}
+	xfs_swapext_reflink_finish(*tpp, req, reflink_state);
 
 	xfs_trans_log_inode(*tpp, ip,  src_log_flags);
 	xfs_trans_log_inode(*tpp, tip, target_log_flags);
@@ -1554,6 +1529,11 @@ xfs_swap_extents(
 	struct xfs_inode	*tip,	/* tmp inode */
 	struct xfs_swapext	*sxp)
 {
+	struct xfs_swapext_req	req = {
+		.ip1		= ip,
+		.ip2		= tip,
+		.whichfork	= XFS_DATA_FORK,
+	};
 	struct xfs_mount	*mp = ip->i_mount;
 	struct xfs_trans	*tp;
 	struct xfs_bstat	*sbp = &sxp->sx_stat;
@@ -1689,17 +1669,11 @@ xfs_swap_extents(
 	 * recovery is going to see the fork as owned by the swapped inode,
 	 * not the pre-swapped inodes.
 	 */
-	if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
-		struct xfs_swapext_req	req = {
-			.ip1		= ip,
-			.ip2		= tip,
-			.whichfork	= XFS_DATA_FORK,
-			.blockcount	= XFS_B_TO_FSB(ip->i_mount,
-						       i_size_read(VFS_I(ip))),
-		};
+	req.blockcount = XFS_B_TO_FSB(ip->i_mount, i_size_read(VFS_I(ip)));
+	if (xfs_sb_version_hasrmapbt(&mp->m_sb))
 		error = xfs_swapext(&tp, &req);
-	} else
-		error = xfs_swap_extent_forks(&tp, ip, tip);
+	else
+		error = xfs_swap_extent_forks(&tp, &req);
 	if (error) {
 		trace_xfs_swap_extent_error(ip, error, _THIS_IP_);
 		goto out_trans_cancel;