Messages in this thread Patch in this message | | | From | Chao Yu <> | Subject | [f2fs-dev][RFC PATCH 07/10] f2fs: add a mount option for rb-tree extent cache | Date | Mon, 12 Jan 2015 15:15:45 +0800 |
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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> --- 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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