f2fs: fix to clean previous mount option when remount_fs

In manual of mount, we descript remount as below:

"mount -o remount,rw /dev/foo /dir
After  this call all old mount options are replaced and arbitrary stuff from
fstab is ignored, except the loop= option which is internally generated and
maintained by the mount command."

Previously f2fs do not clear up old mount options when remount_fs, so we have no
chance of disabling previous option (e.g. flush_merge). Fix it.

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

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 3dfa1b5eae2f..7a91a381dced 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -618,6 +618,9 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
         org_mount_opt = sbi->mount_opt;
         active_logs = sbi->active_logs;
 
+        sbi->mount_opt.opt = 0;
+        sbi->active_logs = NR_CURSEG_TYPE;
+
         /* parse mount options */
         err = parse_options(sb, data);
         if (err)