linux-kernel - [PATCH 8/8] bcache: use generic helper to set max_discard

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Message-Id: <1365860416-21499-1-git-send-email-linkinjeon@gmail.com>
Date:	Sat, 13 Apr 2013 22:40:16 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	dwmw2@...radead.org, axboe@...nel.dk, shli@...nel.org,
	Paul.Clements@...eleye.com, npiggin@...nel.dk, neilb@...e.de,
	cjb@...top.org, adrian.hunter@...el.com
Cc:	linux-mtd@...ts.infradead.org, nbd-general@...ts.sourceforge.net,
	linux-raid@...r.kernel.org, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org, Namjae Jeon <linkinjeon@...il.com>,
	Namjae Jeon <namjae.jeon@...sung.com>,
	Vivek Trivedi <t.vivek@...sung.com>
Subject: [PATCH 8/8] bcache: use generic helper to set max_discard_sectors

From: Namjae Jeon <namjae.jeon@...sung.com>

It is better to use blk_queue_max_discard_sectors helper
function to set max_discard_sectors as it checks
max_discard_sectors upper limit UINT_MAX >> 9

similar issue was reported for mmc in below link
https://lkml.org/lkml/2013/4/1/292

If multiple discard requests get merged, merged discard request's
size exceeds 4GB, there is possibility that merged discard request's
__data_len field may overflow.

This patch fixes this issue.

Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com>
Signed-off-by: Vivek Trivedi <t.vivek@...sung.com>
---
 drivers/md/bcache/super.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index f3bf310..d87ab31 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -746,7 +746,7 @@ static int bcache_device_init(struct bcache_device *d, unsigned block_size)
 	q->limits.max_sectors		= UINT_MAX;
 	q->limits.max_segment_size	= UINT_MAX;
 	q->limits.max_segments		= BIO_MAX_PAGES;
-	q->limits.max_discard_sectors	= UINT_MAX;
+	blk_queue_max_discard_sectors(q, UINT_MAX >> 9);
 	q->limits.io_min		= block_size;
 	q->limits.logical_block_size	= block_size;
 	q->limits.physical_block_size	= block_size;
-- 
1.7.9.5

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