| From d82ae52e68892338068e7559a0c0657193341ce4 Mon Sep 17 00:00:00 2001 |
| From: Mike Snitzer <snitzer@redhat.com> |
| Date: Fri, 18 Oct 2013 09:44:49 -0600 |
| Subject: block: properly stack underlying max_segment_size to DM device |
| |
| 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; |
| } |
