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 them 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
