f2fs: add a mount option for rb-tree extent cache

This patch adds a mount option 'extent_cache' in f2fs.

It is try to use a rb-tree based extent cache to cache more mapping information
with less memory if this option is set, otherwise we will use the original one
extent info cache.

Suggested-by: Changman Lee <cm224.lee@samsung.com>
Signed-off-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 dac11d7..48e2123 100644 (file)
--- a/Documentation/filesystems/f2fs.txt
+++ b/Documentation/filesystems/f2fs.txt
@@ -140,6 +140,10 @@ nobarrier              This option can be used if underlying storage guarantees
 fastboot               This option is used when a system wants to reduce mount
                        time as much as possible, even though normal performance
                       can be sacrificed.
+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.
 
 ================================================================================
 DEBUGFS ENTRIES

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index a0af10d..759fbaa 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -50,6 +50,7 @@
 #define F2FS_MOUNT_FLUSH_MERGE         0x00000400
 #define F2FS_MOUNT_NOBARRIER           0x00000800
 #define F2FS_MOUNT_FASTBOOT            0x00001000
+#define F2FS_MOUNT_EXTENT_CACHE                0x00002000
 
 #define clear_opt(sbi, option) (sbi->mount_opt.opt &= ~F2FS_MOUNT_##option)
 #define set_opt(sbi, option)   (sbi->mount_opt.opt |= F2FS_MOUNT_##option)

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 4e9aad4..3ce4d7c 100644 (file)
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -57,6 +57,7 @@ enum {
        Opt_flush_merge,
        Opt_nobarrier,
        Opt_fastboot,
+       Opt_extent_cache,
        Opt_err,
 };
 
@@ -78,6 +79,7 @@ static match_table_t f2fs_tokens = {
        {Opt_flush_merge, "flush_merge"},
        {Opt_nobarrier, "nobarrier"},
        {Opt_fastboot, "fastboot"},
+       {Opt_extent_cache, "extent_cache"},
        {Opt_err, NULL},
 };
 
@@ -367,6 +369,9 @@ static int parse_options(struct super_block *sb, char *options)
                case Opt_fastboot:
                        set_opt(sbi, FASTBOOT);
                        break;
+               case Opt_extent_cache:
+                       set_opt(sbi, EXTENT_CACHE);
+                       break;
                default:
                        f2fs_msg(sb, KERN_ERR,
                                "Unrecognized mount option \"%s\" or missing value",
@@ -599,6 +604,8 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
                seq_puts(seq, ",nobarrier");
        if (test_opt(sbi, FASTBOOT))
                seq_puts(seq, ",fastboot");
+       if (test_opt(sbi, EXTENT_CACHE))
+               seq_puts(seq, ",extent_cache");
        seq_printf(seq, ",active_logs=%u", sbi->active_logs);
 
        return 0;