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>
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 4e9aad4..3ce4d7c 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -57,6 +57,7 @@
Opt_flush_merge,
Opt_nobarrier,
Opt_fastboot,
+ Opt_extent_cache,
Opt_err,
};
@@ -78,6 +79,7 @@
{Opt_flush_merge, "flush_merge"},
{Opt_nobarrier, "nobarrier"},
{Opt_fastboot, "fastboot"},
+ {Opt_extent_cache, "extent_cache"},
{Opt_err, NULL},
};
@@ -367,6 +369,9 @@
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 @@
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;