f2fs: add noextent_cache mount option

This patch adds noextent_cache mount option.

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

diff --git a/Documentation/filesystems/f2fs.txt b/Documentation/filesystems/f2fs.txt
index e9e750e..e2d5105 100644 (file)
--- a/Documentation/filesystems/f2fs.txt
+++ b/Documentation/filesystems/f2fs.txt
@@ -143,7 +143,9 @@ fastboot               This option is used when a system wants to reduce mount
 extent_cache           Enable an extent cache based on rb-tree, it can cache
                        as many as extent which map between contiguous logical
                        address and physical address per inode, resulting in
-                       increasing the cache hit ratio.
+                       increasing the cache hit ratio. Set by default.
+noextent_cache         Diable an extent cache based on rb-tree explicitly, see
+                       the above extent_cache mount option.
 noinline_data          Disable the inline data feature, inline data feature is
                        enabled by default.
 

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index bc7684b..9252022 100644 (file)
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -65,6 +65,7 @@ enum {
        Opt_nobarrier,
        Opt_fastboot,
        Opt_extent_cache,
+       Opt_noextent_cache,
        Opt_noinline_data,
        Opt_err,
 };
@@ -88,6 +89,7 @@ static match_table_t f2fs_tokens = {
        {Opt_nobarrier, "nobarrier"},
        {Opt_fastboot, "fastboot"},
        {Opt_extent_cache, "extent_cache"},
+       {Opt_noextent_cache, "noextent_cache"},
        {Opt_noinline_data, "noinline_data"},
        {Opt_err, NULL},
 };
@@ -389,6 +391,9 @@ static int parse_options(struct super_block *sb, char *options)
                case Opt_extent_cache:
                        set_opt(sbi, EXTENT_CACHE);
                        break;
+               case Opt_noextent_cache:
+                       clear_opt(sbi, EXTENT_CACHE);
+                       break;
                case Opt_noinline_data:
                        clear_opt(sbi, INLINE_DATA);
                        break;
@@ -662,6 +667,8 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
                seq_puts(seq, ",fastboot");
        if (test_opt(sbi, EXTENT_CACHE))
                seq_puts(seq, ",extent_cache");
+       else
+               seq_puts(seq, ",noextent_cache");
        seq_printf(seq, ",active_logs=%u", sbi->active_logs);
 
        return 0;