[PATCH 16/42] xfs: update rmap to allow cow staging extents in the rt rmap

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

From: Darrick J. Wong <djwong@xxxxxxxxxx>

Don't error out on CoW staging extent records when realtime reflink is
enabled.

Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
 fs/xfs/libxfs/xfs_rmap.c |   14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)


diff --git a/fs/xfs/libxfs/xfs_rmap.c b/fs/xfs/libxfs/xfs_rmap.c
index a533588a9b5b..891af03afccc 100644
--- a/fs/xfs/libxfs/xfs_rmap.c
+++ b/fs/xfs/libxfs/xfs_rmap.c
@@ -274,6 +274,7 @@ xfs_rmap_check_rtgroup_irec(
 	bool				is_unwritten;
 	bool				is_bmbt;
 	bool				is_attr;
+	bool				is_cow;
 
 	if (irec->rm_blockcount == 0)
 		return __this_address;
@@ -285,6 +286,12 @@ xfs_rmap_check_rtgroup_irec(
 			return __this_address;
 		if (irec->rm_offset != 0)
 			return __this_address;
+	} else if (irec->rm_owner == XFS_RMAP_OWN_COW) {
+		if (!xfs_has_rtreflink(mp))
+			return __this_address;
+		if (!xfs_verify_rgbext(rtg, irec->rm_startblock,
+					    irec->rm_blockcount))
+			return __this_address;
 	} else {
 		if (!xfs_verify_rgbext(rtg, irec->rm_startblock,
 					    irec->rm_blockcount))
@@ -301,8 +308,10 @@ xfs_rmap_check_rtgroup_irec(
 	is_bmbt = irec->rm_flags & XFS_RMAP_BMBT_BLOCK;
 	is_attr = irec->rm_flags & XFS_RMAP_ATTR_FORK;
 	is_unwritten = irec->rm_flags & XFS_RMAP_UNWRITTEN;
+	is_cow = xfs_has_rtreflink(mp) &&
+		 irec->rm_owner == XFS_RMAP_OWN_COW;
 
-	if (!is_inode && irec->rm_owner != XFS_RMAP_OWN_FS)
+	if (!is_inode && !is_cow && irec->rm_owner != XFS_RMAP_OWN_FS)
 		return __this_address;
 
 	if (!is_inode && irec->rm_offset != 0)
@@ -314,6 +323,9 @@ xfs_rmap_check_rtgroup_irec(
 	if (is_unwritten && !is_inode)
 		return __this_address;
 
+	if (is_unwritten && is_cow)
+		return __this_address;
+
 	/* Check for a valid fork offset, if applicable. */
 	if (is_inode &&
 	    !xfs_verify_fileext(mp, irec->rm_offset, irec->rm_blockcount))