f2fs: support norecovery mount option

This patch adds a mount option, norecovery, which is mostly same as
disable_roll_forward. The only difference is that norecovery should be activated
with read-only mount option.

This can be used when user wants to check whether f2fs is mountable or not
without any recovery process. (e.g., xfstests/200)

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

2 files changed, 10 insertions, 0 deletions

diff --git a/Documentation/filesystems/f2fs.txt b/Documentation/filesystems/f2fs.txt
index e0950c483c22..6758aa358475 100644
--- a/Documentation/filesystems/f2fs.txt
+++ b/Documentation/filesystems/f2fs.txt
@@ -106,6 +106,8 @@ background_gc=%s       Turn on/off cleaning operations, namely garbage
                        Default value for this option is on. So garbage
                        collection is on by default.
 disable_roll_forward   Disable the roll-forward recovery routine
+norecovery             Disable the roll-forward recovery routine, mounted read-
+                       only (i.e., -o ro,disable_roll_forward)
 discard                Issue discard/TRIM commands when a segment is cleaned.
 no_heap                Disable heap-style segment allocation which finds free
                        segments for data from the beginning of main area, while
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 146e310fbf04..06d903b5d6c8 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -42,6 +42,7 @@ static struct kset *f2fs_kset;
 enum {
         Opt_gc_background,
         Opt_disable_roll_forward,
+        Opt_norecovery,
         Opt_discard,
         Opt_noheap,
         Opt_user_xattr,
@@ -62,6 +63,7 @@ enum {
 static match_table_t f2fs_tokens = {
         {Opt_gc_background, "background_gc=%s"},
         {Opt_disable_roll_forward, "disable_roll_forward"},
+        {Opt_norecovery, "norecovery"},
         {Opt_discard, "discard"},
         {Opt_noheap, "no_heap"},
         {Opt_user_xattr, "user_xattr"},
@@ -287,6 +289,12 @@ static int parse_options(struct super_block *sb, char *options)
                 case Opt_disable_roll_forward:
                         set_opt(sbi, DISABLE_ROLL_FORWARD);
                         break;
+                case Opt_norecovery:
+                        /* this option mounts f2fs with ro */
+                        set_opt(sbi, DISABLE_ROLL_FORWARD);
+                        if (!f2fs_readonly(sb))
+                                return -EINVAL;
+                        break;
                 case Opt_discard:
                         set_opt(sbi, DISCARD);
                         break;