[Ocfs2-tools-devel] [PATCH v4] mount.ocfs2: catch -EROFS if file system is readonly

[piaojun]

If metadata is corrupted such as 'invalid inode block', we will get
-EROFS by calling 'mount()'. In this situation we need notice user to
fix it by fsck, and mount again rather than doing meaningless retry.

Signed-off-by: Jun Piao <piaojun at huawei.com>
---
 libocfs2/ocfs2_err.et     |  4 ++--
 mount.ocfs2/mount.ocfs2.c | 11 +++++++++--
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/libocfs2/ocfs2_err.et b/libocfs2/ocfs2_err.et
index 34cefed..3dc0ce2 100644
--- a/libocfs2/ocfs2_err.et
+++ b/libocfs2/ocfs2_err.et
@@ -168,8 +168,8 @@ ec	OCFS2_ET_NO_IONICE,
 ec	OCFS2_ET_NO_BACKUP_SUPER,
 	"Backup superblock not found"

-ec      OCFS2_ET_TOO_MANY_SLOTS,
-        "Too many slots for slot map"
+ec	OCFS2_ET_TOO_MANY_SLOTS,
+	"Too many slots for slot map"

 ec	OCFS2_ET_CANNOT_INLINE_DATA,
 	"Unable to write the data inline"
diff --git a/mount.ocfs2/mount.ocfs2.c b/mount.ocfs2/mount.ocfs2.c
index e3d8871..5481ae9 100644
--- a/mount.ocfs2/mount.ocfs2.c
+++ b/mount.ocfs2/mount.ocfs2.c
@@ -434,8 +434,15 @@ int main(int argc, char **argv)
 			o2cb_complete_group_join(&cluster, &desc, errno);
 		}
 		block_signals (SIG_UNBLOCK);
-		com_err(progname, ret, "while mounting %s on %s. Check 'dmesg' "
-			"for more information on this error.", mo.dev, mo.dir);
+		if (ret == -EROFS)
+			com_err(progname, OCFS2_ET_RO_FILESYS, "while mounting %s "
+				"on %s, please try fixing this by fsck.ocfs2 and then "
+				"retry mounting", mo.dev, mo.dir);
+		else
+			com_err(progname, OCFS2_ET_INTERNAL_FAILURE,
+				"while mounting %s on %s. Check 'dmesg' for more "
+				"information on this error %d.", mo.dev, mo.dir,
+				(int)ret);
 		goto bail;
 	}
 	if (group_join) {
--