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Commit 89672159 authored by Chao Yu's avatar Chao Yu Committed by Jaegeuk Kim
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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: default avatarChangman Lee <cm224.lee@samsung.com>
Signed-off-by: default avatarChao Yu <chao2.yu@samsung.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 429511cd

Documentation/filesystems/f2fs.txt

+4 −0
Original line number Diff line number Diff line
@@ -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

fs/f2fs/f2fs.h

+1 −0
Original line number Diff line number Diff line
@@ -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)

fs/f2fs/super.c

+7 −0
Original line number Diff line number Diff line
@@ -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;