[PATCH 16/22] xfs_repair: reject unwritten shared extents

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

From: Darrick J. Wong <djwong@xxxxxxxxxx>

We don't allow sharing of unwritten extents, which means that repair
should reject an unwritten extent if someone else has already claimed
the space.

Signed-off-by: "Darrick J. Wong" <djwong@xxxxxxxxxx>
---
 repair/dinode.c |   36 ++++++++++++++++++++++++++++++------
 1 file changed, 30 insertions(+), 6 deletions(-)


diff --git a/repair/dinode.c b/repair/dinode.c
index 3260df94511ed2..f49c735d34356b 100644
--- a/repair/dinode.c
+++ b/repair/dinode.c
@@ -311,7 +311,8 @@ _("bad state in rt extent map %" PRIu64 "\n"),
 			break;
 		case XR_E_INUSE:
 		case XR_E_MULT:
-			if (xfs_has_rtreflink(mp))
+			if (xfs_has_rtreflink(mp) &&
+			    irec->br_state == XFS_EXT_NORM)
 				break;
 			set_rtbmap(ext, XR_E_MULT);
 			break;
@@ -387,8 +388,14 @@ _("data fork in rt inode %" PRIu64 " found rt metadata extent %" PRIu64 " in rt
 			return 1;
 		case XR_E_INUSE:
 		case XR_E_MULT:
-			if (xfs_has_rtreflink(mp))
-				break;
+			if (xfs_has_rtreflink(mp)) {
+				if (irec->br_state == XFS_EXT_NORM)
+					break;
+				do_warn(
+_("data fork in rt inode %" PRIu64 " claims shared unwritten rt extent %" PRIu64 "\n"),
+					ino, b);
+				return 1;
+			}
 			do_warn(
 _("data fork in rt inode %" PRIu64 " claims used rt extent %" PRIu64 "\n"),
 				ino, b);
@@ -472,6 +479,18 @@ _("inode %" PRIu64 " - bad rt extent overflows - start %" PRIu64 ", "
 	return bad;
 }
 
+static inline bool
+is_reflink_type(
+	struct xfs_mount	*mp,
+	int			type)
+{
+	if (type == XR_INO_DATA && xfs_has_reflink(mp))
+		return true;
+	if (type == XR_INO_RTDATA && xfs_has_rtreflink(mp))
+		return true;
+	return false;
+}
+
 /*
  * return 1 if inode should be cleared, 0 otherwise
  * if check_dups should be set to 1, that implies that
@@ -717,9 +736,14 @@ _("%s fork in inode %" PRIu64 " claims metadata block %" PRIu64 "\n"),
 
 			case XR_E_INUSE:
 			case XR_E_MULT:
-				if (type == XR_INO_DATA &&
-				    xfs_has_reflink(mp))
-					break;
+				if (is_reflink_type(mp, type)) {
+					if (irec.br_state == XFS_EXT_NORM)
+						break;
+					do_warn(
+_("%s fork in %s inode %" PRIu64 " claims shared unwritten block %" PRIu64 "\n"),
+						forkname, ftype, ino, b);
+					goto done;
+				}
 				do_warn(
 _("%s fork in %s inode %" PRIu64 " claims used block %" PRIu64 "\n"),
 					forkname, ftype, ino, b);