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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>
This commit is contained in:
Chao Yu 2015-02-05 17:55:51 +08:00 committed by Jaegeuk Kim
parent 429511cdf8
commit 8967215954
3 changed files with 12 additions and 0 deletions
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4
Documentation/filesystems/f2fs.txt
View File

@ -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

1
fs/f2fs/f2fs.h
View File

@ -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)

7
fs/f2fs/super.c
View File

@ -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;