linux-kernel - [PATCH 3.4 32/39] block: properly stack underlying max_segment

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Message-Id: <20131127005621.297249774@linuxfoundation.org>
Date:	Tue, 26 Nov 2013 16:56:56 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Lukasz Flis <l.flis@...ronet.pl>,
	Mike Snitzer <snitzer@...hat.com>, Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 3.4 32/39] block: properly stack underlying max_segment_size to DM device

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mike Snitzer <snitzer@...hat.com>

commit d82ae52e68892338068e7559a0c0657193341ce4 upstream.

Without this patch all DM devices will default to BLK_MAX_SEGMENT_SIZE
(65536) even if the underlying device(s) have a larger value -- this is
due to blk_stack_limits() using min_not_zero() when stacking the
max_segment_size limit.

1073741824

before patch:
65536

after patch:
1073741824

Reported-by: Lukasz Flis <l.flis@...ronet.pl>
Signed-off-by: Mike Snitzer <snitzer@...hat.com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 block/blk-settings.c |    1 +
 1 file changed, 1 insertion(+)

--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -143,6 +143,7 @@ void blk_set_stacking_limits(struct queu
 	lim->discard_zeroes_data = 1;
 	lim->max_segments = USHRT_MAX;
 	lim->max_hw_sectors = UINT_MAX;
+	lim->max_segment_size = UINT_MAX;
 
 	lim->max_sectors = BLK_DEF_MAX_SECTORS;
 }


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