Merge tag 'for-5.8/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/devic...

Pull device mapper updates from Mike Snitzer:

 - The largest change for this cycle is the DM zoned target's metadata
   version 2 feature that adds support for pairing regular block devices
   with a zoned device to ease the performance impact associated with
   finite random zones of zoned device.

   The changes came in three batches: the first prepared for and then
   added the ability to pair a single regular block device, the second
   was a batch of fixes to improve zoned's reclaim heuristic, and the
   third removed the limitation of only adding a single additional
   regular block device to allow many devices.

   Testing has shown linear scaling as more devices are added.

 - Add new emulated block size (ebs) target that emulates a smaller
   logical_block_size than a block device supports

   The primary use-case is to emulate "512e" devices that have 512 byte
   logical_block_size and 4KB physical_block_size. This is useful to
   some legacy applications that otherwise wouldn't be able to be used
   on 4K devices because they depend on issuing IO in 512 byte
   granularity.

 - Add discard interfaces to DM bufio. First consumer of the interface
   is the dm-ebs target that makes heavy use of dm-bufio.

 - Fix DM crypt's block queue_limits stacking to not truncate
   logic_block_size.

 - Add Documentation for DM integrity's status line.

 - Switch DMDEBUG from a compile time config option to instead use
   dynamic debug via pr_debug.

 - Fix DM multipath target's hueristic for how it manages
   "queue_if_no_path" state internally.

   DM multipath now avoids disabling "queue_if_no_path" unless it is
   actually needed (e.g. in response to configure timeout or explicit
   "fail_if_no_path" message).

   This fixes reports of spurious -EIO being reported back to userspace
   application during fault tolerance testing with an NVMe backend.
   Added various dynamic DMDEBUG messages to assist with debugging
   queue_if_no_path in the future.

 - Add a new DM multipath "Historical Service Time" Path Selector.

 - Fix DM multipath's dm_blk_ioctl() to switch paths on IO error.

 - Improve DM writecache target performance by using explicit cache
   flushing for target's single-threaded usecase and a small cleanup to
   remove unnecessary test in persistent_memory_claim.

 - Other small cleanups in DM core, dm-persistent-data, and DM
   integrity.

* tag 'for-5.8/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm: (62 commits)
  dm crypt: avoid truncating the logical block size
  dm mpath: add DM device name to Failing/Reinstating path log messages
  dm mpath: enhance queue_if_no_path debugging
  dm mpath: restrict queue_if_no_path state machine
  dm mpath: simplify __must_push_back
  dm zoned: check superblock location
  dm zoned: prefer full zones for reclaim
  dm zoned: select reclaim zone based on device index
  dm zoned: allocate zone by device index
  dm zoned: support arbitrary number of devices
  dm zoned: move random and sequential zones into struct dmz_dev
  dm zoned: per-device reclaim
  dm zoned: add metadata pointer to struct dmz_dev
  dm zoned: add device pointer to struct dm_zone
  dm zoned: allocate temporary superblock for tertiary devices
  dm zoned: convert to xarray
  dm zoned: add a 'reserved' zone flag
  dm zoned: improve logging messages for reclaim
  dm zoned: avoid unnecessary device recalulation for secondary superblock
  dm zoned: add debugging message for reading superblocks
  ...

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

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

diff --cc drivers/md/dm-zoned-metadata.c
index bf22453,314ce31..130b5a6
--- 1/drivers/md/dm-zoned-metadata.c
--- 2/drivers/md/dm-zoned-metadata.c
+++ b/drivers/md/dm-zoned-metadata.c
@@@ -659,9 -816,10 +816,10 @@@ static int dmz_write_sb(struct dmz_meta
        sb->crc = 0;
        sb->crc = cpu_to_le32(crc32_le(sb_gen, (unsigned char *)sb, DMZ_BLOCK_SIZE));
  
-       ret = dmz_rdwr_block(zmd, REQ_OP_WRITE, block, mblk->page);
+       ret = dmz_rdwr_block(dev, REQ_OP_WRITE, zmd->sb[set].block,
+                            mblk->page);
        if (ret == 0)
-               ret = blkdev_issue_flush(zmd->dev->bdev, GFP_NOIO);
 -              ret = blkdev_issue_flush(dev->bdev, GFP_NOIO, NULL);
++              ret = blkdev_issue_flush(dev->bdev, GFP_NOIO);
  
        return ret;
  }
@@@ -703,7 -862,7 +862,7 @@@ static int dmz_write_dirty_mblocks(stru
  
        /* Flush drive cache (this will also sync data) */
        if (ret == 0)
-               ret = blkdev_issue_flush(zmd->dev->bdev, GFP_NOIO);
 -              ret = blkdev_issue_flush(dev->bdev, GFP_NOIO, NULL);
++              ret = blkdev_issue_flush(dev->bdev, GFP_NOIO);
  
        return ret;
  }
@@@ -772,7 -933,7 +933,7 @@@ int dmz_flush_metadata(struct dmz_metad
  
        /* If there are no dirty metadata blocks, just flush the device cache */
        if (list_empty(&write_list)) {
-               ret = blkdev_issue_flush(zmd->dev->bdev, GFP_NOIO);
 -              ret = blkdev_issue_flush(dev->bdev, GFP_NOIO, NULL);
++              ret = blkdev_issue_flush(dev->bdev, GFP_NOIO);
                goto err;
        }
  

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