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block: allow max_discard_segments to be stacked 

[ Upstream commit 42c9cdfe1e ]

Set max_discard_segments to USHRT_MAX in blk_set_stacking_limits() so
that blk_stack_limits() can stack up this limit for stacked devices.

before:

$ cat /sys/block/nvme0n1/queue/max_discard_segments
256
$ cat /sys/block/dm-0/queue/max_discard_segments
1

after:

$ cat /sys/block/nvme0n1/queue/max_discard_segments
256
$ cat /sys/block/dm-0/queue/max_discard_segments
256

Fixes: 1e739730c5 ("block: optionally merge discontiguous discard bios into a single request")
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Mike Snitzer 2018-07-20 14:57:38 -04:00 committed by Greg Kroah-Hartman
parent 394df59143
commit 030f2ad6ce
1 changed files with 1 additions and 1 deletions
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2
block/blk-settings.c
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@ -128,7 +128,7 @@ void blk_set_stacking_limits(struct queue_limits *lim)
/* Inherit limits from component devices */
lim->max_segments = USHRT_MAX;
lim->max_discard_segments = 1;
lim->max_discard_segments = USHRT_MAX;
lim->max_hw_sectors = UINT_MAX;
lim->max_segment_size = UINT_MAX;
lim->max_sectors = UINT_MAX;