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(-) -- 2.9.4
