This is a note to let you know that I've just added the patch titled
block: properly stack underlying max_segment_size to DM device
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
block-properly-stack-underlying-max_segment_size-to-dm-device.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d82ae52e68892338068e7559a0c0657193341ce4 Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@xxxxxxxxxx>
Date: Fri, 18 Oct 2013 09:44:49 -0600
Subject: block: properly stack underlying max_segment_size to DM device
From: Mike Snitzer <snitzer@xxxxxxxxxx>
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@xxxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
block/blk-settings.c | 1 +
1 file changed, 1 insertion(+)
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -144,6 +144,7 @@ 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 = UINT_MAX;
lim->max_write_same_sectors = UINT_MAX;
}
Patches currently in stable-queue which might be from snitzer@xxxxxxxxxx are
queue-3.12/block-properly-stack-underlying-max_segment_size-to-dm-device.patch
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