Merge tag 'for-6.16/block-20250523' of git://git.kernel.dk/linux

Pull block updates from Jens Axboe:

 - ublk updates:
      - Add support for updating the size of a ublk instance
      - Zero-copy improvements
      - Auto-registering of buffers for zero-copy
      - Series simplifying and improving GET_DATA and request lookup
      - Series adding quiesce support
      - Lots of selftests additions
      - Various cleanups

 - NVMe updates via Christoph:
      - add per-node DMA pools and use them for PRP/SGL allocations
        (Caleb Sander Mateos, Keith Busch)
      - nvme-fcloop refcounting fixes (Daniel Wagner)
      - support delayed removal of the multipath node and optionally
        support the multipath node for private namespaces (Nilay Shroff)
      - support shared CQs in the PCI endpoint target code (Wilfred
        Mallawa)
      - support admin-queue only authentication (Hannes Reinecke)
      - use the crc32c library instead of the crypto API (Eric Biggers)
      - misc cleanups (Christoph Hellwig, Marcelo Moreira, Hannes
        Reinecke, Leon Romanovsky, Gustavo A. R. Silva)

 - MD updates via Yu:
      - Fix that normal IO can be starved by sync IO, found by mkfs on
        newly created large raid5, with some clean up patches for bdev
        inflight counters

 - Clean up brd, getting rid of atomic kmaps and bvec poking

 - Add loop driver specifically for zoned IO testing

 - Eliminate blk-rq-qos calls with a static key, if not enabled

 - Improve hctx locking for when a plug has IO for multiple queues
   pending

 - Remove block layer bouncing support, which in turn means we can
   remove the per-node bounce stat as well

 - Improve blk-throttle support

 - Improve delay support for blk-throttle

 - Improve brd discard support

 - Unify IO scheduler switching. This should also fix a bunch of lockdep
   warnings we've been seeing, after enabling lockdep support for queue
   freezing/unfreezeing

 - Add support for block write streams via FDP (flexible data placement)
   on NVMe

 - Add a bunch of block helpers, facilitating the removal of a bunch of
   duplicated boilerplate code

 - Remove obsolete BLK_MQ pci and virtio Kconfig options

 - Add atomic/untorn write support to blktrace

 - Various little cleanups and fixes

* tag 'for-6.16/block-20250523' of git://git.kernel.dk/linux: (186 commits)
  selftests: ublk: add test for UBLK_F_QUIESCE
  ublk: add feature UBLK_F_QUIESCE
  selftests: ublk: add test case for UBLK_U_CMD_UPDATE_SIZE
  traceevent/block: Add REQ_ATOMIC flag to block trace events
  ublk: run auto buf unregisgering in same io_ring_ctx with registering
  io_uring: add helper io_uring_cmd_ctx_handle()
  ublk: remove io argument from ublk_auto_buf_reg_fallback()
  ublk: handle ublk_set_auto_buf_reg() failure correctly in ublk_fetch()
  selftests: ublk: add test for covering UBLK_AUTO_BUF_REG_FALLBACK
  selftests: ublk: support UBLK_F_AUTO_BUF_REG
  ublk: support UBLK_AUTO_BUF_REG_FALLBACK
  ublk: register buffer to local io_uring with provided buf index via UBLK_F_AUTO_BUF_REG
  ublk: prepare for supporting to register request buffer automatically
  ublk: convert to refcount_t
  selftests: ublk: make IO & device removal test more stressful
  nvme: rename nvme_mpath_shutdown_disk to nvme_mpath_remove_disk
  nvme: introduce multipath_always_on module param
  nvme-multipath: introduce delayed removal of the multipath head node
  nvme-pci: derive and better document max segments limits
  nvme-pci: use struct_size for allocation struct nvme_dev
  ...

diff --cc MAINTAINERS
Simple merge

diff --cc block/bio.c
Simple merge

diff --cc block/blk-wbt.c
Simple merge

diff --cc drivers/block/ublk_drv.c
Simple merge

diff --cc drivers/md/dm-bufio.c
Simple merge

diff --cc drivers/md/dm-integrity.c
Simple merge

diff --cc drivers/nvme/host/core.c
Simple merge

diff --cc drivers/nvme/host/multipath.c
Simple merge

diff --cc drivers/nvme/host/nvme.h
Simple merge

diff --cc drivers/nvme/host/pci.c
Simple merge

diff --cc drivers/nvme/host/sysfs.c
Simple merge

diff --cc drivers/nvme/target/pci-epf.c
index 7123c855b5a67c85d3d3973073aea53e58a9a88b,ec529305bc75064721f9a13cf46d2a6ed6e81c2b..a4295a5b8d280f4cba246b9651fb21880183c504
--- 1/drivers/nvme/target/pci-epf.c
--- 2/drivers/nvme/target/pci-epf.c
+++ b/drivers/nvme/target/pci-epf.c
@@@ -1351,9 -1344,9 +1351,10 @@@ static u16 nvmet_pci_epf_delete_cq(stru
  
        cancel_delayed_work_sync(&cq->work);
        nvmet_pci_epf_drain_queue(cq);
 -      nvmet_pci_epf_remove_irq_vector(ctrl, cq->vector);
 +      if (test_and_clear_bit(NVMET_PCI_EPF_Q_IRQ_ENABLED, &cq->flags))
 +              nvmet_pci_epf_remove_irq_vector(ctrl, cq->vector);
        nvmet_pci_epf_mem_unmap(ctrl->nvme_epf, &cq->pci_map);
+       nvmet_cq_put(&cq->nvme_cq);
  
        return NVME_SC_SUCCESS;
  }

diff --cc drivers/scsi/scsi_lib.c
Simple merge

diff --cc fs/btrfs/scrub.c
Simple merge

diff --cc include/linux/bio.h
Simple merge

diff --cc include/linux/blkdev.h
Simple merge

diff --cc include/linux/fs.h
Simple merge

diff --cc io_uring/io_uring.c
Simple merge