f2fs: introduce mode=lfs mount option
This mount option is to enable original log-structured filesystem forcefully.
So, there should be no random writes for main area.
Especially, this supports host-managed SMR device.
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/Documentation/filesystems/f2fs.txt b/Documentation/filesystems/f2fs.txt
index e1c9f08..3a5ce24 100644
--- a/Documentation/filesystems/f2fs.txt
+++ b/Documentation/filesystems/f2fs.txt
@@ -151,6 +151,9 @@
enabled by default.
data_flush Enable data flushing before checkpoint in order to
persist data of regular and symlink.
+mode=%s Control block allocation mode which supports "adaptive"
+ and "lfs". In "lfs" mode, there should be no random
+ writes towards main area.
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