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BACKPORT: block/loop: set hw_sectors

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Loop can handle any size of request. Limiting it to 255 sectors just
burns the CPU for bio split and request merge for underlayer disk and
also cause bad fs block allocation in directio mode.

Bug: 117823094
Change-Id: Ic4957181433c5a0d15f4cfdbf69dc5558d6dc5bd
Reviewed-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
(cherry picked from commit 54bb0ade66)
Signed-off-by: Martijn Coenen <maco@android.com>
This commit is contained in:
Shaohua Li
2017-08-31 22:09:45 -07:00
committed by Martijn Coenen
parent 6edf1ad773
commit 8567ea359c
1 changed files with 1 additions and 0 deletions
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drivers/block/loop.c
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@@ -1813,6 +1813,7 @@ static int loop_add(struct loop_device **l, int i)
}
lo->lo_queue->queuedata = lo;
blk_queue_max_hw_sectors(lo->lo_queue, BLK_DEF_MAX_SECTORS);
/*
* It doesn't make sense to enable merge because the I/O
* submitted to backing file is handled page by page.