ext4: return EROFS if device is r/o and journal replay is needed

If the file system requires journal recovery, and the device is
read-ony, return EROFS to the mount system call.  This allows xfstests
generic/050 to pass.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 3fef82e79131d6a512d91fc79b743681607ef572..514e5fc598933fe2584af7693f7d3e6863c1f542 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3925,7 +3925,8 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
         * root first: it may be modified in the journal!
         */
        if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
-               if (ext4_load_journal(sb, es, journal_devnum))
+               err = ext4_load_journal(sb, es, journal_devnum);
+               if (err)
                        goto failed_mount3a;
        } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
                   ext4_has_feature_journal_needs_recovery(sb)) {