Re: [git pull v3] device mapper changes for 5.8

[Mike Snitzer <snitzer@redhat.com>]

On Tue, Jun 09 2020 at  9:59am -0400,
Mike Snitzer <snitzer@redhat.com> wrote:

> [resending as v3 due to my From: email addr in v2 being inexplicably wrong]

The pr-tracker-bot responded to that email address and I missed it:
https://www.redhat.com/archives/dm-devel/2020-June/msg00067.html

I should've just looked at your tree.  Thanks for your quick pull.

Sorry for the noise.

Mike


> 
> Hi Linus,
> 
> I had some miscommunication with Mikulas on his -ENOMEM sleep and retry
> changes for dm-crypt and dm-integrity, he no longer thinks them
> appropriate: https://www.redhat.com/archives/dm-devel/2020-June/msg00061.html
> So I dropped them via rebase and updated the tag (to avoid any
> potential for linux-stable churn due to Mikulas' commits having
> cc'd linux-stable).  Hope that was the correct way forward...
> 
> For the following changes there is one dm-zoned-metadata.c conflict that
> linux-next has been carrying for a while.  See commit d77e96f277 ("Merge
> remote-tracking branch 'device-mapper/for-next'") from next-20200605.
> It resolves conflict from linux-block's commit 9398554fb3 ("block:
> remove the_error_sector argument to blkdev_issue_flush").
> 
> The following changes since commit 2ef96a5bb12be62ef75b5828c0aab838ebb29cb8:
> 
>   Linux 5.7-rc5 (2020-05-10 15:16:58 -0700)
> 
> are available in the Git repository at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git tags/for-5.8/dm-changes
> 
> for you to fetch changes up to 64611a15ca9da91ff532982429c44686f4593b5f:
> 
>   dm crypt: avoid truncating the logical block size (2020-06-05 14:59:59 -0400)
> 
> Please pull, thanks!
> Mike
> 
> ----------------------------------------------------------------
> - 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 performance impact associated
>   with finite random zones of zoned device.  Changes came in 3
>   batches: first prepared for and then added the ability to pair a
>   single regular block device, second was a batch of fixes to improve
>   zoned's reclaim heuristic, 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.  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 otherwise wouldn't be ablee 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.
> 
> ----------------------------------------------------------------
> Dmitry Baryshkov (1):
>       dm crypt: support using encrypted keys
> 
> Eric Biggers (1):
>       dm crypt: avoid truncating the logical block size
> 
> Gabriel Krisman Bertazi (1):
>       dm mpath: pass IO start time to path selector
> 
> Gustavo A. R. Silva (1):
>       dm: replace zero-length array with flexible-array
> 
> Hannes Reinecke (38):
>       dm zoned: add 'status' callback
>       dm zoned: add 'message' callback
>       dm zoned: store zone id within the zone structure and kill dmz_id()
>       dm zoned: use array for superblock zones
>       dm zoned: store device in struct dmz_sb
>       dm zoned: move fields from struct dmz_dev to dmz_metadata
>       dm zoned: introduce dmz_metadata_label() to format device name
>       dm zoned: Introduce dmz_dev_is_dying() and dmz_check_dev()
>       dm zoned: remove 'dev' argument from reclaim
>       dm zoned: replace 'target' pointer in the bio context
>       dm zoned: use dmz_zone_to_dev() when handling metadata I/O
>       dm zoned: add metadata logging functions
>       dm zoned: Reduce logging output on startup
>       dm zoned: ignore metadata zone in dmz_alloc_zone()
>       dm zoned: metadata version 2
>       dm: use dynamic debug instead of compile-time config option
>       dm zoned: remove spurious newlines from debugging messages
>       dm zoned: return NULL if dmz_get_zone_for_reclaim() fails to find a zone
>       dm zoned: separate random and cache zones
>       dm zoned: reclaim random zones when idle
>       dm zoned: start reclaim with sequential zones
>       dm zoned: terminate reclaim on congestion
>       dm zoned: remove leftover hunk for switching to sequential zones
>       dm zoned: add debugging message for reading superblocks
>       dm zoned: avoid unnecessary device recalulation for secondary superblock
>       dm zoned: improve logging messages for reclaim
>       dm zoned: add a 'reserved' zone flag
>       dm zoned: convert to xarray
>       dm zoned: allocate temporary superblock for tertiary devices
>       dm zoned: add device pointer to struct dm_zone
>       dm zoned: add metadata pointer to struct dmz_dev
>       dm zoned: per-device reclaim
>       dm zoned: move random and sequential zones into struct dmz_dev
>       dm zoned: support arbitrary number of devices
>       dm zoned: allocate zone by device index
>       dm zoned: select reclaim zone based on device index
>       dm zoned: prefer full zones for reclaim
>       dm zoned: check superblock location
> 
> Heinz Mauelshagen (2):
>       dm: add emulated block size target
>       dm ebs: pass discards down to underlying device
> 
> Khazhismel Kumykov (1):
>       dm mpath: add Historical Service Time Path Selector
> 
> Martin Wilck (1):
>       dm mpath: switch paths in dm_blk_ioctl() code path
> 
> Mike Snitzer (5):
>       dm: use DMDEBUG macros now that they use pr_debug variants
>       dm mpath: simplify __must_push_back
>       dm mpath: restrict queue_if_no_path state machine
>       dm mpath: enhance queue_if_no_path debugging
>       dm mpath: add DM device name to Failing/Reinstating path log messages
> 
> Mikulas Patocka (8):
>       dm bufio: implement discard
>       dm writecache: remove superfluous test in persistent_memory_claim
>       dm writecache: improve performance on DDR persistent memory (Optane)
>       dm bufio: delete unused and inefficient dm_bufio_discard_buffers
>       dm integrity: add status line documentation
>       dm bufio: clean up rbtree block ordering
>       dm bufio: introduce forget_buffer_locked
>       dm ebs: use dm_bufio_forget_buffers
> 
> Nathan Chancellor (1):
>       dm zoned: Avoid 64-bit division error in dmz_fixup_devices
> 
> YueHaibing (1):
>       dm integrity: remove set but not used variables
> 
> Zhiqiang Liu (1):
>       dm persistent data: switch exit_ro_spine to return void
> 
>  Documentation/admin-guide/device-mapper/dm-ebs.rst |   51 +
>  .../admin-guide/device-mapper/dm-integrity.rst     |    8 +
>  .../admin-guide/device-mapper/dm-zoned.rst         |   62 +-
>  drivers/md/Kconfig                                 |   20 +
>  drivers/md/Makefile                                |    3 +
>  drivers/md/dm-bufio.c                              |  109 +-
>  drivers/md/dm-crypt.c                              |   80 +-
>  drivers/md/dm-ebs-target.c                         |  471 +++++++++
>  drivers/md/dm-historical-service-time.c            |  561 +++++++++++
>  drivers/md/dm-integrity.c                          |    6 +-
>  drivers/md/dm-log-writes.c                         |    2 +-
>  drivers/md/dm-mpath.c                              |  123 ++-
>  drivers/md/dm-path-selector.h                      |    2 +-
>  drivers/md/dm-queue-length.c                       |    2 +-
>  drivers/md/dm-raid.c                               |    2 +-
>  drivers/md/dm-raid1.c                              |    2 +-
>  drivers/md/dm-service-time.c                       |    2 +-
>  drivers/md/dm-stats.c                              |    2 +-
>  drivers/md/dm-stripe.c                             |    2 +-
>  drivers/md/dm-switch.c                             |    2 +-
>  drivers/md/dm-writecache.c                         |   42 +-
>  drivers/md/dm-zoned-metadata.c                     | 1046 +++++++++++++++-----
>  drivers/md/dm-zoned-reclaim.c                      |  210 ++--
>  drivers/md/dm-zoned-target.c                       |  463 ++++++---
>  drivers/md/dm-zoned.h                              |  113 ++-
>  drivers/md/dm.c                                    |   11 +-
>  drivers/md/persistent-data/dm-btree-internal.h     |    4 +-
>  drivers/md/persistent-data/dm-btree-spine.c        |    6 +-
>  include/linux/device-mapper.h                      |    9 +-
>  include/linux/dm-bufio.h                           |   12 +
>  30 files changed, 2779 insertions(+), 649 deletions(-)
>  create mode 100644 Documentation/admin-guide/device-mapper/dm-ebs.rst
>  create mode 100644 drivers/md/dm-ebs-target.c
>  create mode 100644 drivers/md/dm-historical-service-time.c