Enumerator at include/linux/blk-mq.h, line 389 References: arch/um/drivers/ubd_kern.c, line 931 block/blk-mq-sched.c, line 337 drivers/block/amiflop.c, line 1784 drivers/block/aoe/aoeblk.c, line 387 drivers/block/ataflop.c, line 1995 drivers/block/floppy.c, line 4568 drivers/block/loop.c, line 2015 drivers/block/mtip32xx/mtip32xx.c, line 3627 drivers/block/nbd.c, line 1693 drivers/block/null_blk_main.c, line 1603 drivers/block/paride/pcd.c, line 318 drivers/block/paride/pd.c, line 912 drivers/block/paride/pf.c, line 302 drivers/block/ps3disk.c, line 445 drivers/block/rbd.c, line 5029 drivers/block/skd_main.c, line 2842 drivers/block/sunvdc.c, line 796 drivers/block/swim.c, line 842 drivers/block/swim3.c, line 1198 drivers/block/sx8.c, line 1466 drivers/block/virtio_blk.c, line 688 drivers/block/xen-blkfront.c, line 989 drivers/block/xsysace.c, line 1011 drivers/block/z2ram.c, line 364 drivers/cdrom/gdrom.c, line 785 drivers/ide/ide-probe.c, line 786 drivers/md/dm-rq.c, line 550 drivers/memstick/core/ms_block.c, line 2120 drivers/memstick/core/mspro_block.c, line 1215 drivers/mmc/core/queue.c, line 439 drivers/mtd/mtd_blkdevs.c, line 434 drivers/mtd/ubi/block.c, line 422 drivers/nvme/host/fc.c, line 2467 drivers/nvme/host/pci.c, line 2277 drivers/nvme/host/rdma.c, line 746 drivers/nvme/host/tcp.c, line 1490 drivers/nvme/target/loop.c, line 517 drivers/s390/block/dasd.c, line 3276 drivers/s390/block/scm_blk.c, line 457 drivers/scsi/scsi_lib.c, line 1901 include/linux/blk-mq.h, line 389