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....@samsung.com>
Signed-off-by: Chao Yu <chao2...@samsung.com>
---
Documentation/filesystems/f2fs.txt | 4 ++++
fs/f2fs/f2fs.h | 1 +
fs/f2fs/super.c | 7 +++++++
3 files changed, 12 insertions(+)
diff --git a/Documentation/filesystems/f2fs.txt
b/Documentation/filesystems/f2fs.txt
index e0950c4..87ae1a2 100644
--- a/Documentation/filesystems/f2fs.txt
+++ b/Documentation/filesystems/f2fs.txt
@@ -138,6 +138,10 @@ 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 6decfd2..d065ff1 100644
--- 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 8b8de7f..5041e719 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -56,6 +56,7 @@ enum {
Opt_flush_merge,
Opt_nobarrier,
Opt_fastboot,
+ Opt_extent_cache,
Opt_err,
};
@@ -76,6 +77,7 @@ 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},
};
@@ -357,6 +359,9 @@ 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",
@@ -583,6 +588,8 @@ 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;
--
2.2.1
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