Pull block fixes from Jens Axboe:

 - ublk selftests for missing coverage

 - two fixes for the block integrity code

 - fix for the newly added newly added PR read keys ioctl, limiting the
   memory that can be allocated

 - work around for a deadlock that can occur with ublk, where partition
   scanning ends up recursing back into file closure, which needs the
   same mutex grabbed. Not the prettiest thing in the world, but an
   acceptable work-around until we can eliminate the reliance on
   disk->open_mutex for this

 - fix for a race between enabling writeback throttling and new IO
   submissions

 - move a bit of bio flag handling code. No changes, but needed for a
   patchset for a future kernel

 - fix for an init time id leak failure in rnbd

 - loop/zloop state check fix

* tag 'block-6.19-20251218' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux:
  block: validate interval_exp integrity limit
  block: validate pi_offset integrity limit
  block: rnbd-clt: Fix leaked ID in init_dev()
  ublk: fix deadlock when reading partition table
  block: add allocation size check in blkdev_pr_read_keys()
  Documentation: admin-guide: blockdev: replace zone_capacity with zone_capacity_mb when creating devices
  zloop: use READ_ONCE() to read lo->lo_state in queue_rq path
  loop: use READ_ONCE() to read lo->lo_state without locking
  block: fix race between wbt_enable_default and IO submission
  selftests: ublk: add user copy test cases
  selftests: ublk: add support for user copy to kublk
  selftests: ublk: forbid multiple data copy modes
  selftests: ublk: don't share backing files between ublk servers
  selftests: ublk: use auto_zc for PER_IO_DAEMON tests in stress_04
  selftests: ublk: fix fio arguments in run_io_and_recover()
  selftests: ublk: remove unused ios map in seq_io.bt
  selftests: ublk: correct last_rw map type in seq_io.bt
  selftests: ublk: fix overflow in ublk_queue_auto_zc_fallback()
  block: move around bio flagging helpers

If kstrdup() fails in init_dev(), then the newly allocated ID is lost.

Fixes: 64e8a6ece1a5 ("block/rnbd-clt: Dynamically alloc buffer for pathname & blk_symlink_name")
Signed-off-by: Thomas Fourier <fourier.thomas@gmail.com>
Acked-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

When one process(such as udev) opens ublk block device (e.g., to read
the partition table via bdev_open()), a deadlock[1] can occur:

1. bdev_open() grabs disk->open_mutex
2. The process issues read I/O to ublk backend to read partition table
3. In __ublk_complete_rq(), blk_update_request() or blk_mq_end_request()
   runs bio->bi_end_io() callbacks
4. If this triggers fput() on file descriptor of ublk block device, the
   work may be deferred to current task's task work (see fput() implementation)
5. This eventually calls blkdev_release() from the same context
6. blkdev_release() tries to grab disk->open_mutex again
7. Deadlock: same task waiting for a mutex it already holds

The fix is to run blk_update_request() and blk_mq_end_request() with bottom
halves disabled. This forces blkdev_release() to run in kernel work-queue
context instead of current task work context, and allows ublk server to make
forward progress, and avoids the deadlock.

Fixes: 71f28f3136af ("ublk_drv: add io_uring based userspace block driver")
Link: https://github.com/ublk-org/ublksrv/issues/170 [1]
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Caleb Sander Mateos <csander@purestorage.com>
[axboe: rewrite comment in ublk]
Signed-off-by: Jens Axboe <axboe@kernel.dk>

In the queue_rq path, zlo->state is accessed without locking, and direct
access may read stale data. This patch uses READ_ONCE() to read
zlo->state and data_race() to silence code checkers, and changes all
assignments to use WRITE_ONCE().

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Yongpeng Yang <yangyongpeng@xiaomi.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

When lo->lo_mutex is not held, direct access may read stale data. This
patch uses READ_ONCE() to read lo->lo_state and data_race() to silence
code checkers, and changes all assignments to use WRITE_ONCE().

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Yongpeng Yang <yangyongpeng@xiaomi.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Pull ceph updates from Ilya Dryomov:
 "We have a patch that adds an initial set of tracepoints to the MDS
  client from Max, a fix that hardens osdmap parsing code from myself
  (marked for stable) and a few assorted fixups"

* tag 'ceph-for-6.19-rc1' of https://github.com/ceph/ceph-client:
  rbd: stop selecting CRC32, CRYPTO, and CRYPTO_AES
  ceph: stop selecting CRC32, CRYPTO, and CRYPTO_AES
  libceph: make decode_pool() more resilient against corrupted osdmaps
  libceph: Amend checking to fix `make W=1` build breakage
  ceph: Amend checking to fix `make W=1` build breakage
  ceph: add trace points to the MDS client
  libceph: fix log output race condition in OSD client

Pull block fixes from Jens Axboe:

 - Always initialize DMA state, fixing a potentially nasty issue on the
   block side

 - btrfs zoned write fix with cached zone reports

 - Fix corruption issues in bcache with chained bio's, and further make
   it clear that the chained IO handler is simply a marker, it's not
   code meant to be executed

 - Kill old code dealing with synchronous IO polling in the block layer,
   that has been dead for a long time. Only async polling is supported
   these days

 - Fix a lockdep issue in tag_set management, moving it to RCU

 - Fix an issue with ublks bio_vec iteration

 - Don't unconditionally enforce blocking issue of ublk control
   commands, allow some of them with non-blocking issue as they
   do not block

* tag 'block-6.19-20251211' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux:
  blk-mq-dma: always initialize dma state
  blk-mq: delete task running check in blk_hctx_poll()
  block: fix cached zone reports on devices with native zone append
  block: Use RCU in blk_mq_[un]quiesce_tagset() instead of set->tag_list_lock
  ublk: don't mutate struct bio_vec in iteration
  block: prohibit calls to bio_chain_endio
  bcache: fix improper use of bi_end_io
  ublk: allow non-blocking ctrl cmds in IO_URING_F_NONBLOCK issue

None of the RBD code directly requires CRC32, CRYPTO, or CRYPTO_AES.
These options are needed by CEPH_LIB code and they are selected there
directly.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Dongsheng Yang <dongsheng.yang@linux.dev>

__bio_for_each_segment() uses the returned struct bio_vec's bv_len field
to advance the struct bvec_iter at the end of each loop iteration. So
it's incorrect to modify it during the loop. Don't assign to bv_len (or
bv_offset, for that matter) in ublk_copy_user_pages().

Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
Fixes: e87d66ab27ac ("ublk: use rq_for_each_segment() for user copy")
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Pull block updates from Jens Axboe:
 "Followup set of fixes and updates for block for the 6.19 merge window.

  NVMe had some late minute debates which lead to dropping some patches
  from that tree, which is why the initial PR didn't have NVMe included.
  It's here now. This pull request contains:

   - NVMe pull request via Keith:
       - Subsystem usage cleanups (Max)
       - Endpoint device fixes (Shin'ichiro)
       - Debug statements (Gerd)
       - FC fabrics cleanups and fixes (Daniel)
       - Consistent alloc API usages (Israel)
       - Code comment updates (Chu)
       - Authentication retry fix (Justin)

   - Fix a memory leak in the discard ioctl code, if the task is being
     interrupted by a signal at just the wrong time

   - Zoned write plugging fixes

   - Add ioctls for for persistent reservations

   - Enable per-cpu bio caching by default

   - Various little fixes and tweaks"

* tag 'block-6.19-20251208' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux: (27 commits)
  nvme-fabrics: add ENOKEY to no retry criteria for authentication failures
  nvme-auth: use kvfree() for memory allocated with kvcalloc()
  nvmet-tcp: use kvcalloc for commands array
  nvmet-rdma: use kvcalloc for commands and responses arrays
  nvme: fix typo error in nvme target
  nvmet-fc: use pr_* print macros instead of dev_*
  nvmet-fcloop: remove unused lsdir member.
  nvmet-fcloop: check all request and response have been processed
  nvme-fc: check all request and response have been processed
  block: fix memory leak in __blkdev_issue_zero_pages
  block: fix comment for op_is_zone_mgmt() to include RESET_ALL
  block: Clear BLK_ZONE_WPLUG_PLUGGED when aborting plugged BIOs
  blk-mq: Abort suspend when wakeup events are pending
  blk-mq: add blk_rq_nr_bvec() helper
  block: add IOC_PR_READ_RESERVATION ioctl
  block: add IOC_PR_READ_KEYS ioctl
  nvme: reject invalid pr_read_keys() num_keys values
  scsi: sd: reject invalid pr_read_keys() num_keys values
  block: enable per-cpu bio cache by default
  block: use bio_alloc_bioset for passthru IO by default
  ...