From 8967215954a50947fbd9c2996232548bf6dd9062 Mon Sep 17 00:00:00 2001
From: Chao Yu <chao2.yu@samsung.com>
Date: Thu, 5 Feb 2015 17:55:51 +0800
Subject: 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>
---
 Documentation/filesystems/f2fs.txt | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'Documentation/filesystems')

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.
 
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