• Linus Torvalds's avatar
    Merge tag 'for-4.12/dm-changes' of... · d35a878a
    Linus Torvalds authored
    Merge tag 'for-4.12/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm
    Pull device mapper updates from Mike Snitzer:
     - A major update for DM cache that reduces the latency for deciding
       whether blocks should migrate to/from the cache. The bio-prison-v2
       interface supports this improvement by enabling direct dispatch of
       work to workqueues rather than having to delay the actual work
       dispatch to the DM cache core. So the dm-cache policies are much more
       nimble by being able to drive IO as they see fit. One immediate
       benefit from the improved latency is a cache that should be much more
       adaptive to changing workloads.
     - Add a new DM integrity target that emulates a block device that has
       additional per-sector tags that can be used for storing integrity
     - Add a new authenticated encryption feature to the DM crypt target
       that builds on the capabilities provided by the DM integrity target.
     - Add MD interface for switching the raid4/5/6 journal mode and update
       the DM raid target to use it to enable aid4/5/6 journal write-back
     - Switch the DM verity target over to using the asynchronous hash
       crypto API (this helps work better with architectures that have
       access to off-CPU algorithm providers, which should reduce CPU
     - Various request-based DM and DM multipath fixes and improvements from
       Bart and Christoph.
     - A DM thinp target fix for a bio structure leak that occurs for each
       discard IFF discard passdown is enabled.
     - A fix for a possible deadlock in DM bufio and a fix to re-check the
       new buffer allocation watermark in the face of competing admin
       changes to the 'max_cache_size_bytes' tunable.
     - A couple DM core cleanups.
    * tag 'for-4.12/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm: (50 commits)
      dm bufio: check new buffer allocation watermark every 30 seconds
      dm bufio: avoid a possible ABBA deadlock
      dm mpath: make it easier to detect unintended I/O request flushes
      dm mpath: cleanup QUEUE_IF_NO_PATH bit manipulation by introducing assign_bit()
      dm mpath: micro-optimize the hot path relative to MPATHF_QUEUE_IF_NO_PATH
      dm: introduce enum dm_queue_mode to cleanup related code
      dm mpath: verify __pg_init_all_paths locking assumptions at runtime
      dm: verify suspend_locking assumptions at runtime
      dm block manager: remove an unused argument from dm_block_manager_create()
      dm rq: check blk_mq_register_dev() return value in dm_mq_init_request_queue()
      dm mpath: delay requeuing while path initialization is in progress
      dm mpath: avoid that path removal can trigger an infinite loop
      dm mpath: split and rename activate_path() to prepare for its expanded use
      dm ioctl: prevent stack leak in dm ioctl call
      dm integrity: use previously calculated log2 of sectors_per_block
      dm integrity: use hex2bin instead of open-coded variant
      dm crypt: replace custom implementation of hex2bin()
      dm crypt: remove obsolete references to per-CPU state
      dm verity: switch to using asynchronous hash crypto API
      dm crypt: use WQ_HIGHPRI for the IO and crypt workqueues
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