f2fs: should fail mount when trying to recover data on read-only dev

If device is read-only, we should not proceed data recovery.
But, if the previous checkpoint was done by normal clean shutdown, it's safe to
proceed the recovery, since there will be no data to be recovered.

Reviewed-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index bfeab3c81a48..1e92c2ea6bc1 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1149,6 +1149,15 @@ try_onemore:
 
         /* recover fsynced data */
         if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
+                /*
+                 * mount should be failed, when device has readonly mode, and
+                 * previous checkpoint was not done by clean system shutdown.
+                 */
+                if (bdev_read_only(sb->s_bdev) &&
+                                !is_set_ckpt_flags(sbi->ckpt, CP_UMOUNT_FLAG)) {
+                        err = -EROFS;
+                        goto free_kobj;
+                }
                 err = recover_fsync_data(sbi);
                 if (err) {
                         f2fs_msg(sb, KERN_ERR,