Merge tag 'for-5.13/block-2021-04-27' of git://git.kernel.dk/linux-block

Pull block updates from Jens Axboe:
 "Pretty quiet round this time, which is nice. In detail:

   - Series revamping bounce buffer support (Christoph)

   - Dead code removal (Christoph, Bart)

   - Partition iteration revamp, now using xarray (Christoph)

   - Passthrough request scheduler improvements (Lin)

   - Series of BFQ improvements (Paolo)

   - Fix ioprio task iteration (Peter)

   - Various little tweaks and fixes (Tejun, Saravanan, Bhaskar, Max,
     Nikolay)"

* tag 'for-5.13/block-2021-04-27' of git://git.kernel.dk/linux-block: (41 commits)
  blk-iocost: don't ignore vrate_min on QD contention
  blk-mq: Fix spurious debugfs directory creation during initialization
  bfq/mq-deadline: remove redundant check for passthrough request
  blk-mq: bypass IO scheduler's limit_depth for passthrough request
  block: Remove an obsolete comment from sg_io()
  block: move bio_list_copy_data to pktcdvd
  block: remove zero_fill_bio_iter
  block: add queue_to_disk() to get gendisk from request_queue
  block: remove an incorrect check from blk_rq_append_bio
  block: initialize ret in bdev_disk_changed
  block: Fix sys_ioprio_set(.which=IOPRIO_WHO_PGRP) task iteration
  block: remove disk_part_iter
  block: simplify diskstats_show
  block: simplify show_partition
  block: simplify printk_all_partitions
  block: simplify partition_overlaps
  block: simplify partition removal
  block: take bd_mutex around delete_partitions in del_gendisk
  block: refactor blk_drop_partitions
  block: move more syncing and invalidation to delete_partition
  ...

diff --cc block/bio.c
Simple merge

diff --cc block/blk-mq-debugfs.c
Simple merge

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

diff --cc block/partitions/core.c
Simple merge

diff --cc drivers/target/target_core_pscsi.c
Simple merge

diff --cc fs/block_dev.c
index 09d6f72,363015f..2ef2427
--- 1/fs/block_dev.c
--- 2/fs/block_dev.c
+++ b/fs/block_dev.c
@@@ -1244,13 -1240,15 +1244,15 @@@ int bdev_disk_changed(struct block_devi
  
        lockdep_assert_held(&bdev->bd_mutex);
  
 -      clear_bit(GD_NEED_PART_SCAN, &bdev->bd_disk->state);
 -
  rescan:
-       ret = blk_drop_partitions(bdev);
-       if (ret)
-               return ret;
+       if (bdev->bd_part_count)
+               return -EBUSY;
+       sync_blockdev(bdev);
+       invalidate_bdev(bdev);
+       blk_drop_partitions(disk);
  
 +      clear_bit(GD_NEED_PART_SCAN, &disk->state);
 +
        /*
         * Historically we only set the capacity to zero for devices that
         * support partitions (independ of actually having partitions created).

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