| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.10 64/80] block: properly stack underlying max_segment_size to DM device | Date | Tue, 26 Nov 2013 16:57:33 -0800 |
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3.10-stable review patch. If anyone has any objections, please let me know.
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From: Mike Snitzer <snitzer@redhat.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@cyfronet.pl> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- 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; }
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