Merge tag 'for-6.0/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper updates from Mike Snitzer:

 - Refactor DM core's mempool allocation so that it clearer by not being
   split acorss files.

 - Improve DM core's BLK_STS_DM_REQUEUE and BLK_STS_AGAIN handling.

 - Optimize DM core's more common bio splitting by eliminating the use
   of bio cloning with bio_split+bio_chain. Shift that cloning cost to
   the relatively unlikely dm_io requeue case that only occurs during
   error handling. Introduces dm_io_rewind() that will clone a bio that
   reflects the subset of the original bio that must be requeued.

 - Remove DM core's dm_table_get_num_targets() wrapper and audit all
   dm_table_get_target() callers.

 - Fix potential for OOM with DM writecache target by setting a default
   MAX_WRITEBACK_JOBS (set to 256MiB or 1/16 of total system memory,
   whichever is smaller).

 - Fix DM writecache target's stats that are reported through
   DM-specific table info.

 - Fix use-after-free crash in dm_sm_register_threshold_callback().

 - Refine DM core's Persistent Reservation handling in preparation for
   broader work Mike Christie is doing to add compatibility with
   Microsoft Windows Failover Cluster.

 - Fix various KASAN reported bugs in the DM raid target.

 - Fix DM raid target crash due to md_handle_request() bio splitting
   that recurses to block core without properly initializing the bio's
   bi_dev.

 - Fix some code comment typos and fix some Documentation formatting.

* tag 'for-6.0/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm: (29 commits)
  dm: fix dm-raid crash if md_handle_request() splits bio
  dm raid: fix address sanitizer warning in raid_resume
  dm raid: fix address sanitizer warning in raid_status
  dm: Start pr_preempt from the same starting path
  dm: Fix PR release handling for non All Registrants
  dm: Start pr_reserve from the same starting path
  dm: Allow dm_call_pr to be used for path searches
  dm: return early from dm_pr_call() if DM device is suspended
  dm thin: fix use-after-free crash in dm_sm_register_threshold_callback
  dm writecache: count number of blocks discarded, not number of discard bios
  dm writecache: count number of blocks written, not number of write bios
  dm writecache: count number of blocks read, not number of read bios
  dm writecache: return void from functions
  dm kcopyd: use __GFP_HIGHMEM when allocating pages
  dm writecache: set a default MAX_WRITEBACK_JOBS
  Documentation: dm writecache: Render status list as list
  Documentation: dm writecache: add blank line before optional parameters
  dm snapshot: fix typo in snapshot_map() comment
  dm raid: remove redundant "the" in parse_raid_params() comment
  dm cache: fix typo in 2 comment blocks
  ...

1 files changed, 10 insertions, 8 deletions

diff --git a/Documentation/admin-guide/device-mapper/writecache.rst b/Documentation/admin-guide/device-mapper/writecache.rst
index 10429779a91a..60c16b7fd5ac 100644
--- a/Documentation/admin-guide/device-mapper/writecache.rst
+++ b/Documentation/admin-guide/device-mapper/writecache.rst
@@ -20,6 +20,7 @@ Constructor parameters:
    size)
 5. the number of optional parameters (the parameters with an argument
    count as two)
+
 	start_sector n		(default: 0)
 		offset from the start of cache device in 512-byte sectors
 	high_watermark n	(default: 50)
@@ -74,20 +75,21 @@ Constructor parameters:
 		the origin volume in the last n milliseconds
 
 Status:
+
 1. error indicator - 0 if there was no error, otherwise error number
 2. the number of blocks
 3. the number of free blocks
 4. the number of blocks under writeback
-5. the number of read requests
-6. the number of read requests that hit the cache
-7. the number of write requests
-8. the number of write requests that hit uncommitted block
-9. the number of write requests that hit committed block
-10. the number of write requests that bypass the cache
-11. the number of write requests that are allocated in the cache
+5. the number of read blocks
+6. the number of read blocks that hit the cache
+7. the number of write blocks
+8. the number of write blocks that hit uncommitted block
+9. the number of write blocks that hit committed block
+10. the number of write blocks that bypass the cache
+11. the number of write blocks that are allocated in the cache
 12. the number of write requests that are blocked on the freelist
 13. the number of flush requests
-14. the number of discard requests
+14. the number of discarded blocks
 
 Messages:
 	flush