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linux/drivers/md
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Nikos Tsironis de89afc1e4 dm era: Recover committed writeset after crash 
Following a system crash, dm-era fails to recover the committed writeset
for the current era, leading to lost writes. That is, we lose the
information about what blocks were written during the affected era.

dm-era assumes that the writeset of the current era is archived when the
device is suspended. So, when resuming the device, it just moves on to
the next era, ignoring the committed writeset.

This assumption holds when the device is properly shut down. But, when
the system crashes, the code that suspends the target never runs, so the
writeset for the current era is not archived.

There are three issues that cause the committed writeset to get lost:

1. dm-era doesn't load the committed writeset when opening the metadata
2. The code that resizes the metadata wipes the information about the
   committed writeset (assuming it was loaded at step 1)
3. era_preresume() starts a new era, without taking into account that
   the current era might not have been archived, due to a system crash.

To fix this:

1. Load the committed writeset when opening the metadata
2. Fix the code that resizes the metadata to make sure it doesn't wipe
   the loaded writeset
3. Fix era_preresume() to check for a loaded writeset and archive it,
   before starting a new era.

Fixes: eec40579d8 ("dm: add era target")
Cc: stable@vger.kernel.org # v3.15+
Signed-off-by: Nikos Tsironis <ntsironis@arrikto.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
2021-02-10 13:24:56 -05:00
..
bcache bcache: use bio_set_dev to assign ->bi_bdev 2021-01-26 08:50:01 -07:00
persistent-data dm persistent data: fix return type of shadow_root() 2021-02-03 10:10:05 -05:00
dm-bio-prison-v1.c dm bio prison: replace spin_lock_irqsave with spin_lock_irq 2019-11-05 14:53:03 -05:00
dm-bio-prison-v1.h
dm-bio-prison-v2.c dm bio prison v2: use true/false for bool variable 2020-01-07 12:07:08 -05:00
dm-bio-prison-v2.h
dm-bio-record.h block: store a block_device pointer in struct bio 2021-01-24 18:17:20 -07:00
dm-bufio.c dm integrity: fix flush with external metadata device 2021-01-08 15:57:29 -05:00
dm-builtin.c
dm-cache-background-tracker.c
dm-cache-background-tracker.h
dm-cache-block-types.h
dm-cache-metadata.c dm: use bdev_read_only to check if a device is read-only 2021-01-24 18:15:57 -07:00
dm-cache-metadata.h
dm-cache-policy-internal.h
dm-cache-policy-smq.c
dm-cache-policy.c
dm-cache-policy.h
dm-cache-target.c dm cache: simplify the return expression of load_mapping() 2020-12-22 09:54:48 -05:00
dm-clone-metadata.c dm clone metadata: Fix return type of dm_clone_nr_of_hydrated_regions() 2020-03-27 14:42:51 -04:00
dm-clone-metadata.h dm clone metadata: Fix return type of dm_clone_nr_of_hydrated_regions() 2020-03-27 14:42:51 -04:00
dm-clone-target.c dm-clone: use blkdev_issue_flush in commit_metadata 2021-01-27 09:51:48 -07:00
dm-core.h dm: remove the block_device reference in struct mapped_device 2020-12-01 14:53:39 -07:00
dm-crypt.c dm crypt: support using trusted keys 2021-02-03 10:13:00 -05:00
dm-delay.c block: rename generic_make_request to submit_bio_noacct 2020-07-01 07:27:24 -06:00
dm-dust.c dm dust: remove h from printk format specifier 2021-02-03 10:10:04 -05:00
dm-ebs-target.c dm ebs: avoid double unlikely() notation when using IS_ERR() 2020-12-21 13:59:37 -05:00
dm-era-target.c dm era: Recover committed writeset after crash 2021-02-10 13:24:56 -05:00
dm-exception-store.c
dm-exception-store.h - Improve DM snapshot target's scalability by using finer grained 2019-05-16 15:55:48 -07:00
dm-flakey.c block: rework zone reporting 2019-11-12 19:12:07 -07:00
dm-init.c dm init: Set file local variable static 2020-08-04 15:51:28 -04:00
dm-integrity.c dm integrity: introduce the "fix_hmac" argument 2021-02-03 10:10:05 -05:00
dm-io.c treewide: Remove uninitialized_var() usage 2020-07-16 12:35:15 -07:00
dm-ioctl.c dm ioctl: fix error return code in target_message 2020-12-04 18:04:36 -05:00
dm-kcopyd.c dm kcopyd: always complete failed jobs 2019-08-15 15:57:39 -04:00
dm-linear.c dm: add support for REQ_NOWAIT and enable it for linear target 2020-09-25 08:20:03 -06:00
dm-log-userspace-base.c
dm-log-userspace-transfer.c
dm-log-userspace-transfer.h
dm-log-writes.c dm: replace zero-length array with flexible-array 2020-05-20 17:09:44 -04:00
dm-log.c
dm-mpath.c dm: use dm_table_get_device_name() where appropriate in targets 2020-09-29 16:33:08 -04:00
dm-mpath.h
dm-path-selector.c
dm-path-selector.h dm mpath: pass IO start time to path selector 2020-05-15 10:29:36 -04:00
dm-ps-historical-service-time.c dm: rename multipath path selector source files to have "dm-ps" prefix 2020-12-04 18:04:35 -05:00
dm-ps-io-affinity.c dm: rename multipath path selector source files to have "dm-ps" prefix 2020-12-04 18:04:35 -05:00
dm-ps-queue-length.c dm: rename multipath path selector source files to have "dm-ps" prefix 2020-12-04 18:04:35 -05:00
dm-ps-round-robin.c dm: rename multipath path selector source files to have "dm-ps" prefix 2020-12-04 18:04:35 -05:00
dm-ps-service-time.c dm: rename multipath path selector source files to have "dm-ps" prefix 2020-12-04 18:04:35 -05:00
dm-raid.c dm raid: fix discard limits for raid1 2021-01-04 15:02:30 -05:00
dm-raid1.c block: store a block_device pointer in struct bio 2021-01-24 18:17:20 -07:00
dm-region-hash.c
dm-rq.c block: remove the request_queue to argument request based tracepoints 2020-12-04 09:42:00 -07:00
dm-rq.h
dm-snap-persistent.c dm snap persistent: simplify area_io() 2020-09-29 16:33:12 -04:00
dm-snap-transient.c
dm-snap.c dm snapshot: flush merged data before committing metadata 2021-01-06 18:28:34 -05:00
dm-stats.c dm: replace zero-length array with flexible-array 2020-05-20 17:09:44 -04:00
dm-stats.h
dm-stripe.c dm: add support for REQ_NOWAIT to various targets 2020-12-04 18:04:35 -05:00
dm-switch.c dm: add support for REQ_NOWAIT to various targets 2020-12-04 18:04:35 -05:00
dm-sysfs.c
dm-table.c dm table: remove needless request_queue NULL pointer checks 2021-02-09 08:47:49 -05:00
dm-target.c
dm-thin-metadata.c dm: use bdev_read_only to check if a device is read-only 2021-01-24 18:15:57 -07:00
dm-thin-metadata.h dm thin metadata: Add support for a pre-commit callback 2019-12-05 17:05:24 -05:00
dm-thin.c writeback: remove bdi->congested_fn 2020-07-08 17:20:46 -06:00
dm-uevent.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
dm-uevent.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
dm-unstripe.c dm: add support for REQ_NOWAIT to various targets 2020-12-04 18:04:35 -05:00
dm-verity-fec.c dm verity fec: fix hash block number in verity_fec_decode 2020-04-16 16:16:38 -04:00
dm-verity-fec.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
dm-verity-target.c dm verity: skip verity work if I/O error when system is shutting down 2020-12-21 13:57:25 -05:00
dm-verity-verify-sig.c dm verity: Add support for signature verification with 2nd keyring 2020-12-04 18:04:35 -05:00
dm-verity-verify-sig.h dm verity: Fix compilation warning 2020-08-04 15:48:13 -04:00
dm-verity.h dm verity: add "panic_on_corruption" error handling mode 2020-07-13 11:47:33 -04:00
dm-writecache.c dm writecache: use bdev_nr_sectors() instead of open-coded equivalent 2021-02-09 17:09:02 -05:00
dm-zero.c dm: add support for REQ_NOWAIT to various targets 2020-12-04 18:04:35 -05:00
dm-zoned-metadata.c block: use an on-stack bio in blkdev_issue_flush 2021-01-27 09:51:48 -07:00
dm-zoned-reclaim.c dm zoned: Fix zone reclaim trigger 2020-07-08 12:21:53 -04:00
dm-zoned-target.c for-5.9/block-20200802 2020-08-03 11:57:03 -07:00
dm-zoned.h dm zoned: select reclaim zone based on device index 2020-06-05 14:59:53 -04:00
dm.c dm table: fix DAX iterate_devices based device capability checks 2021-02-09 08:45:30 -05:00
dm.h dm table: fix DAX iterate_devices based device capability checks 2021-02-09 08:45:30 -05:00
Kconfig dm crypt: support using trusted keys 2021-02-03 10:13:00 -05:00
Makefile dm: rename multipath path selector source files to have "dm-ps" prefix 2020-12-04 18:04:35 -05:00
md-autodetect.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
md-bitmap.c md/bitmap: fix memory leak of temporary bitmap 2020-10-08 22:37:39 -07:00
md-bitmap.h
md-cluster.c for-5.11/drivers-2020-12-14 2020-12-16 13:09:32 -08:00
md-cluster.h
md-faulty.c block: rename generic_make_request to submit_bio_noacct 2020-07-01 07:27:24 -06:00
md-linear.c block: store a block_device pointer in struct bio 2021-01-24 18:17:20 -07:00
md-linear.h md/raid1: Replace zero-length array with flexible-array 2020-05-13 12:02:23 -07:00
md-multipath.c writeback: remove bdi->congested_fn 2020-07-08 17:20:46 -06:00
md-multipath.h
md.c md: use rdev_read_only in restart_array 2021-02-01 09:35:20 -07:00
md.h md: remove bio_alloc_mddev 2021-01-27 09:51:48 -07:00
raid0.c for-5.11/block-2020-12-14 2020-12-16 12:57:51 -08:00
raid0.h md/raid0: avoid RAID0 data corruption due to layout confusion. 2019-09-13 13:10:05 -07:00
raid1-10.c md: raid1-10: Unify r{1,10}bio_pool_free 2019-06-15 01:37:35 -06:00
raid1.c md: remove bio_alloc_mddev 2021-01-27 09:51:48 -07:00
raid1.h md/raid1: Replace zero-length array with flexible-array 2020-05-13 12:02:23 -07:00
raid5-cache.c raid5-cache: hold spinlock instead of mutex in r5c_journal_mode_show 2020-08-02 23:03:52 -07:00
raid5-log.h
raid5-ppl.c block: use an on-stack bio in blkdev_issue_flush 2021-01-27 09:51:48 -07:00
raid5.c md/raid6: refactor raid5_read_one_chunk 2021-01-27 09:51:48 -07:00
raid5.h md/raid5: let multiple devices of stripe_head share page 2020-09-24 16:44:44 -07:00
raid10.c md: remove bio_alloc_mddev 2021-01-27 09:51:48 -07:00
raid10.h Revert "md/raid10: improve discard request for far layout" 2020-12-09 20:46:00 -08:00