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| author | Chao Yu | 2015-02-05 10:55:51 +0100 |
|---|---|---|
| committer | Jaegeuk Kim | 2015-03-03 18:58:46 +0100 |
| commit | 8967215954a50947fbd9c2996232548bf6dd9062 (patch) | |
| tree | a8e3a164f9c3372fe476e23b09f5871379c31af0 | |
| parent | f2fs: add core functions for rb-tree extent cache (diff) | |
| download | kernel-qcow2-linux-8967215954a50947fbd9c2996232548bf6dd9062.tar.gz kernel-qcow2-linux-8967215954a50947fbd9c2996232548bf6dd9062.tar.xz kernel-qcow2-linux-8967215954a50947fbd9c2996232548bf6dd9062.zip | |
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>
| -rw-r--r-- | Documentation/filesystems/f2fs.txt | 4 | ||||
| -rw-r--r-- | fs/f2fs/f2fs.h | 1 | ||||
| -rw-r--r-- | fs/f2fs/super.c | 7 |
3 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/filesystems/f2fs.txt b/Documentation/filesystems/f2fs.txt index dac11d7fef27..48e2123c2582 100644 --- 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 a0af10dad871..759fbaaa6ca1 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 4e9aad451593..3ce4d7c9a29d 100644 --- 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; |