Structure at include/linux/blk-mq.h, line 99 References: block/blk-mq.c, line 593 drivers/block/loop.c, line 1704 drivers/block/mtip32xx/mtip32xx.c, line 3896 drivers/block/nbd.c, line 882 drivers/block/null_blk.c, line 395 drivers/block/rbd.c, line 4461 drivers/block/virtio_blk.c, line 543 drivers/block/xen-blkfront.c, line 910 drivers/md/dm-rq.c, line 942 drivers/mtd/ubi/block.c, line 351 drivers/nvme/host/pci.c, line 1143 drivers/nvme/host/pci.c, line 1152 drivers/nvme/host/rdma.c, line 1514 drivers/nvme/host/rdma.c, line 1525 drivers/nvme/target/loop.c, line 273 drivers/nvme/target/loop.c, line 281 drivers/scsi/scsi_lib.c, line 2079 include/linux/blk-mq.h, line 60 include/linux/blk-mq.h, line 99