f2fs: add nobarrier mount option

This patch adds a mount option, nobarrier, in f2fs.
The assumption in here is that file system keeps the IO ordering, but
doesn't care about cache flushes inside the storages.

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

1 files changed, 7 insertions, 0 deletions

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 34649aa66e04..93593ceec175 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -52,6 +52,7 @@ enum {
         Opt_inline_xattr,
         Opt_inline_data,
         Opt_flush_merge,
+        Opt_nobarrier,
         Opt_err,
 };
 
@@ -69,6 +70,7 @@ static match_table_t f2fs_tokens = {
         {Opt_inline_xattr, "inline_xattr"},
         {Opt_inline_data, "inline_data"},
         {Opt_flush_merge, "flush_merge"},
+        {Opt_nobarrier, "nobarrier"},
         {Opt_err, NULL},
 };
 
@@ -339,6 +341,9 @@ static int parse_options(struct super_block *sb, char *options)
                 case Opt_flush_merge:
                         set_opt(sbi, FLUSH_MERGE);
                         break;
+                case Opt_nobarrier:
+                        set_opt(sbi, NOBARRIER);
+                        break;
                 default:
                         f2fs_msg(sb, KERN_ERR,
                                 "Unrecognized mount option \"%s\" or missing value",
@@ -544,6 +549,8 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
                 seq_puts(seq, ",inline_data");
         if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
                 seq_puts(seq, ",flush_merge");
+        if (test_opt(sbi, NOBARRIER))
+                seq_puts(seq, ",nobarrier");
         seq_printf(seq, ",active_logs=%u", sbi->active_logs);
 
         return 0;