From e46b8a030d76d3c94156c545c3f4c3676d813435 Mon Sep 17 00:00:00 2001
From: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Date: Mon, 7 Apr 2014 15:38:17 -0700
Subject: zram: make compression algorithm selection possible

Add and document `comp_algorithm' device attribute.  This attribute allows
to show supported compression and currently selected compression
algorithms:

	cat /sys/block/zram0/comp_algorithm
	[lzo] lz4

and change selected compression algorithm:
	echo lzo > /sys/block/zram0/comp_algorithm

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Jerome Marchand <jmarchan@redhat.com>
Cc: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 drivers/block/zram/zcomp.h | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'drivers/block/zram/zcomp.h')

diff --git a/drivers/block/zram/zcomp.h b/drivers/block/zram/zcomp.h
index bd11d59c5dd1..8b8997f8613b 100644
--- a/drivers/block/zram/zcomp.h
+++ b/drivers/block/zram/zcomp.h
@@ -50,6 +50,8 @@ struct zcomp {
 	void (*destroy)(struct zcomp *comp);
 };
 
+ssize_t zcomp_available_show(const char *comp, char *buf);
+
 struct zcomp *zcomp_create(const char *comp, int max_strm);
 void zcomp_destroy(struct zcomp *comp);
 
-- 
cgit v1.2.3