Hi Jens, currently queue limits updates are a mess in that they are updated one limit at a time, which makes both cross-checking them against other limits hard, and also makes it hard to provide atomicy. This series tries to change this by updating the whole set of queue limits atomically. This in done in two ways: - for the initial setup the queue_limits structure is simply passed to the queue/disk allocation helpers and applies there after validation. - for the (relatively few) cases that update limits at runtime a pair of helpers to take a snapshot of the current limits and to commit it after picking up the callers changes are provided. As the series is big enough it only converts two drivers - virtio_blk as a heavily used driver in virtualized setups, and loop as one that actually does runtime updates while being fairly simple. I plan to update most drivers for this merge window, although SCSI will probably have to wait for the next one given that it will need extensive API changes in the LLDD and ULD interfaces. Chances since v1: - remove a spurious NULL return in blk_alloc_queue - keep the existing max_discard_sectors == 0 behavior - drop the patch nvme discard limit update hack - it will go into the series updating nvme instead - drop a chunk_sector check - use PAGE_SECTORS in a few places - document the checks and defaults in blk_validate_limits - various spelling fixes Diffstat: arch/um/drivers/ubd_kern.c | 2 block/blk-core.c | 31 ++- block/blk-mq.c | 26 +-- block/blk-settings.c | 213 ++++++++++++++++++++++++- block/blk-sysfs.c | 59 +++---- block/blk.h | 3 block/bsg-lib.c | 2 block/genhd.c | 4 drivers/block/amiflop.c | 2 drivers/block/aoe/aoeblk.c | 2 drivers/block/ataflop.c | 2 drivers/block/floppy.c | 2 drivers/block/loop.c | 75 ++++----- drivers/block/mtip32xx/mtip32xx.c | 2 drivers/block/nbd.c | 2 drivers/block/null_blk/main.c | 2 drivers/block/ps3disk.c | 2 drivers/block/rbd.c | 2 drivers/block/rnbd/rnbd-clt.c | 2 drivers/block/sunvdc.c | 2 drivers/block/swim.c | 2 drivers/block/swim3.c | 2 drivers/block/ublk_drv.c | 2 drivers/block/virtio_blk.c | 299 ++++++++++++++++++------------------ drivers/block/xen-blkfront.c | 2 drivers/block/z2ram.c | 2 drivers/cdrom/gdrom.c | 2 drivers/memstick/core/ms_block.c | 2 drivers/memstick/core/mspro_block.c | 2 drivers/mmc/core/queue.c | 2 drivers/mtd/mtd_blkdevs.c | 2 drivers/mtd/ubi/block.c | 2 drivers/nvme/host/apple.c | 2 drivers/nvme/host/core.c | 8 drivers/s390/block/dasd_genhd.c | 2 drivers/s390/block/scm_blk.c | 2 drivers/scsi/scsi_scan.c | 2 drivers/ufs/core/ufshcd.c | 2 include/linux/blk-mq.h | 10 - include/linux/blkdev.h | 36 +++- 40 files changed, 526 insertions(+), 296 deletions(-)
