From db3d080b40ecce86ec6755a04544bbc59aa344da Mon Sep 17 00:00:00 2001
From: "Darrick J. Wong" <darrick.wong@oracle.com>
Date: Wed, 1 Aug 2018 17:06:44 -0500
Subject: [PATCH] xfs_repair: use libxfs extsize/cowextsize validation helpers

Now that we've ported the extent size hint verifiers to libxfs, call
them from xfs_repair instead of open-coding the checks.  Tweak the
repair message slightly to reflect the fact that we zero the field and
clear the inode flag if the hint is garbage or is inconsistent with the
inode flags.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
---
 libxfs/libxfs_api_defs.h |  2 ++
 repair/dinode.c          | 75 ++++++++++++++--------------------------
 2 files changed, 28 insertions(+), 49 deletions(-)

diff --git a/libxfs/libxfs_api_defs.h b/libxfs/libxfs_api_defs.h
index 74a5af16d..641d193c6 100644
--- a/libxfs/libxfs_api_defs.h
+++ b/libxfs/libxfs_api_defs.h
@@ -97,6 +97,8 @@
 #define xfs_dinode_calc_crc		libxfs_dinode_calc_crc
 #define xfs_idata_realloc		libxfs_idata_realloc
 #define xfs_idestroy_fork		libxfs_idestroy_fork
+#define xfs_inode_validate_extsize	libxfs_inode_validate_extsize
+#define xfs_inode_validate_cowextsize	libxfs_inode_validate_cowextsize
 
 #define xfs_rmap_ag_owner		libxfs_rmap_ag_owner
 #define xfs_rmap_alloc			libxfs_rmap_alloc
diff --git a/repair/dinode.c b/repair/dinode.c
index 036f48457..e3b0cdc9c 100644
--- a/repair/dinode.c
+++ b/repair/dinode.c
@@ -2841,24 +2841,21 @@ _("bad (negative) size %" PRId64 " on inode %" PRIu64 "\n"),
 	 * only regular files with REALTIME or EXTSIZE flags set can have
 	 * extsize set, or directories with EXTSZINHERIT.
 	 */
-	if (be32_to_cpu(dino->di_extsize) != 0) {
-		if ((type == XR_INO_RTDATA) ||
-		    (type == XR_INO_DIR && (be16_to_cpu(dino->di_flags) &
-					XFS_DIFLAG_EXTSZINHERIT)) ||
-		    (type == XR_INO_DATA && (be16_to_cpu(dino->di_flags) &
-				 XFS_DIFLAG_EXTSIZE)))  {
-			/* s'okay */ ;
-		} else {
-			do_warn(
-_("bad non-zero extent size %u for non-realtime/extsize inode %" PRIu64 ", "),
-					be32_to_cpu(dino->di_extsize), lino);
-			if (!no_modify)  {
-				do_warn(_("resetting to zero\n"));
-				dino->di_extsize = 0;
-				*dirty = 1;
-			} else
-				do_warn(_("would reset to zero\n"));
-		}
+	if (libxfs_inode_validate_extsize(mp,
+			be32_to_cpu(dino->di_extsize),
+			be16_to_cpu(dino->di_mode),
+			be16_to_cpu(dino->di_flags)) != NULL) {
+		do_warn(
+_("Bad extent size %u on inode %" PRIu64 ", "),
+				be32_to_cpu(dino->di_extsize), lino);
+		if (!no_modify)  {
+			do_warn(_("resetting to zero\n"));
+			dino->di_extsize = 0;
+			dino->di_flags &= ~cpu_to_be16(XFS_DIFLAG_EXTSIZE |
+						       XFS_DIFLAG_EXTSZINHERIT);
+			*dirty = 1;
+		} else
+			do_warn(_("would reset to zero\n"));
 	}
 
 	/*
@@ -2866,41 +2863,21 @@ _("bad non-zero extent size %u for non-realtime/extsize inode %" PRIu64 ", "),
 	 * set can have extsize set.
 	 */
 	if (dino->di_version >= 3 &&
-	    be32_to_cpu(dino->di_cowextsize) != 0) {
-		if ((type == XR_INO_DIR || type == XR_INO_DATA) &&
-		    (be64_to_cpu(dino->di_flags2) &
-					XFS_DIFLAG2_COWEXTSIZE)) {
-			/* s'okay */ ;
-		} else {
-			do_warn(
-_("Cannot have non-zero CoW extent size %u on non-cowextsize inode %" PRIu64 ", "),
-					be32_to_cpu(dino->di_cowextsize), lino);
-			if (!no_modify)  {
-				do_warn(_("resetting to zero\n"));
-				dino->di_flags2 &= ~cpu_to_be64(XFS_DIFLAG2_COWEXTSIZE);
-				dino->di_cowextsize = 0;
-				*dirty = 1;
-			} else
-				do_warn(_("would reset to zero\n"));
-		}
-	}
-
-	/*
-	 * Can't have the COWEXTSIZE flag set with no hint.
-	 */
-	if (dino->di_version >= 3 &&
-	    be32_to_cpu(dino->di_cowextsize) == 0 &&
-	    (be64_to_cpu(dino->di_flags2) & XFS_DIFLAG2_COWEXTSIZE)) {
+	    libxfs_inode_validate_cowextsize(mp,
+			be32_to_cpu(dino->di_cowextsize),
+			be16_to_cpu(dino->di_mode),
+			be16_to_cpu(dino->di_flags),
+			be64_to_cpu(dino->di_flags2)) != NULL) {
 		do_warn(
-_("Cannot have CoW extent size of zero on cowextsize inode %" PRIu64 ", "),
-				lino);
+_("Bad CoW extent size %u on inode %" PRIu64 ", "),
+				be32_to_cpu(dino->di_cowextsize), lino);
 		if (!no_modify)  {
-			do_warn(_("clearing cowextsize flag\n"));
+			do_warn(_("resetting to zero\n"));
 			dino->di_flags2 &= ~cpu_to_be64(XFS_DIFLAG2_COWEXTSIZE);
+			dino->di_cowextsize = 0;
 			*dirty = 1;
-		} else {
-			do_warn(_("would clear cowextsize flag\n"));
-		}
+		} else
+			do_warn(_("would reset to zero\n"));
 	}
 
 	/* nsec fields cannot be larger than 1 billion */
-- 
2.47.2