[RFC PATCH 0/2] use larger max_request_size for virtio_blk

[Weiping Zhang <zhangweiping@didichuxing.com>]

Hi,

For virtio block device, actually there is no a hard limit for max request
size, and virtio_blk driver set -1 to blk_queue_max_hw_sectors(q, -1U);.
But it doesn't work, because there is a default upper limitation
BLK_DEF_MAX_SECTORS (1280 sectors). So this series want to add a new helper
blk_queue_max_hw_sectors_no_limit to set a proper max reqeust size.

Weiping Zhang (2):
  blk-setting: add new helper blk_queue_max_hw_sectors_no_limit
  virtio_blk: add new module parameter to set max request size

 block/blk-settings.c       | 20 ++++++++++++++++++++
 drivers/block/virtio_blk.c | 32 ++++++++++++++++++++++++++++++--
 include/linux/blkdev.h     |  2 ++
 3 files changed, 52 insertions(+), 2 deletions(-)

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2.9.4