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d1260e2a3f
linux/drivers/md
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Joe Thornber d1260e2a3f dm cache: fix race condition in the writeback mode overwrite_bio optimisation 
When a DM cache in writeback mode moves data between the slow and fast
device it can often avoid a copy if the triggering bio either:

i) covers the whole block (no point copying if we're about to overwrite it)
ii) the migration is a promotion and the origin block is currently discarded

Prior to this fix there was a race with case (ii).  The discard status
was checked with a shared lock held (rather than exclusive).  This meant
another bio could run in parallel and write data to the origin, removing
the discard state.  After the promotion the parallel write would have
been lost.

With this fix the discard status is re-checked once the exclusive lock
has been aquired.  If the block is no longer discarded it falls back to
the slower full copy path.

Fixes: b29d4986d ("dm cache: significant rework to leverage dm-bio-prison-v2")
Cc: stable@vger.kernel.org # v4.12+
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
2017-11-10 15:43:39 -05:00
..
bcache bcache: use llist_for_each_entry_safe() in __closure_wake_up() 2017-09-27 14:54:49 -06:00
persistent-data
bitmap.c md/bitmap: disable bitmap_resize for file-backed bitmaps. 2017-08-31 22:57:03 -07:00
bitmap.h
dm-bio-prison-v1.c dm bio prison: use rb_entry() rather than container_of() 2017-06-19 11:03:50 -04:00
dm-bio-prison-v1.h
dm-bio-prison-v2.c dm bio prison: use rb_entry() rather than container_of() 2017-06-19 11:03:50 -04:00
dm-bio-prison-v2.h
dm-bio-record.h block: replace bi_bdev with a gendisk pointer and partitions index 2017-08-23 12:49:55 -06:00
dm-bufio.c - Some request-based DM core and DM multipath fixes and cleanups 2017-09-14 13:43:16 -07:00
dm-bufio.h dm integrity: optimize writing dm-bufio buffers that are partially changed 2017-08-28 11:47:17 -04:00
dm-builtin.c
dm-cache-background-tracker.c
dm-cache-background-tracker.h
dm-cache-block-types.h
dm-cache-metadata.c dm cache: convert dm_cache_metadata.ref_count from atomic_t to refcount_t 2017-10-24 15:09:51 -04:00
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: fix race condition in the writeback mode overwrite_bio optimisation 2017-11-10 15:43:39 -05:00
dm-core.h dm ioctl: fix alignment of event number in the device list 2017-09-25 11:18:29 -04:00
dm-crypt.c dm crypt: reject sector_size feature if device length is not aligned to it 2017-10-04 10:49:58 -04:00
dm-delay.c block: replace bi_bdev with a gendisk pointer and partitions index 2017-08-23 12:49:55 -06:00
dm-era-target.c block: replace bi_bdev with a gendisk pointer and partitions index 2017-08-23 12:49:55 -06:00
dm-exception-store.c
dm-exception-store.h
dm-flakey.c - Some request-based DM core and DM multipath fixes and cleanups 2017-09-14 13:43:16 -07:00
dm-integrity.c - Some request-based DM core and DM multipath fixes and cleanups 2017-09-14 13:43:16 -07:00
dm-io.c block: replace bi_bdev with a gendisk pointer and partitions index 2017-08-23 12:49:55 -06:00
dm-ioctl.c dm ioctl: fix alignment of event number in the device list 2017-09-25 11:18:29 -04:00
dm-kcopyd.c dm kcopyd: add sequential write feature 2017-06-19 11:03:51 -04:00
dm-linear.c - Some request-based DM core and DM multipath fixes and cleanups 2017-09-14 13:43:16 -07:00
dm-log-userspace-base.c
dm-log-userspace-transfer.c
dm-log-userspace-transfer.h
dm-log-writes.c - Some request-based DM core and DM multipath fixes and cleanups 2017-09-14 13:43:16 -07:00
dm-log.c
dm-mpath.c - Some request-based DM core and DM multipath fixes and cleanups 2017-09-14 13:43:16 -07:00
dm-mpath.h
dm-path-selector.c
dm-path-selector.h
dm-queue-length.c
dm-raid1.c block: replace bi_bdev with a gendisk pointer and partitions index 2017-08-23 12:49:55 -06:00
dm-raid.c - A stable fix for the alignment of the event number reported at the 2017-10-05 15:17:40 -07:00
dm-region-hash.c
dm-round-robin.c
dm-rq.c dm rq: do not update rq partially in each ending bio 2017-08-28 10:23:28 -04:00
dm-rq.h dm rq: do not update rq partially in each ending bio 2017-08-28 10:23:28 -04:00
dm-service-time.c
dm-snap-persistent.c
dm-snap-transient.c
dm-snap.c block: replace bi_bdev with a gendisk pointer and partitions index 2017-08-23 12:49:55 -06:00
dm-stats.c
dm-stats.h
dm-stripe.c - Some request-based DM core and DM multipath fixes and cleanups 2017-09-14 13:43:16 -07:00
dm-switch.c - Some request-based DM core and DM multipath fixes and cleanups 2017-09-14 13:43:16 -07:00
dm-sysfs.c
dm-table.c dm: convert dm_dev_internal.count from atomic_t to refcount_t 2017-10-24 15:09:51 -04:00
dm-target.c
dm-thin-metadata.c
dm-thin-metadata.h
dm-thin.c - Some request-based DM core and DM multipath fixes and cleanups 2017-09-14 13:43:16 -07:00
dm-uevent.c
dm-uevent.h
dm-verity-fec.c dm verity fec: fix GFP flags used with mempool_alloc() 2017-07-26 15:55:44 -04:00
dm-verity-fec.h
dm-verity-target.c - Some request-based DM core and DM multipath fixes and cleanups 2017-09-14 13:43:16 -07:00
dm-verity.h
dm-zero.c
dm-zoned-metadata.c block: replace bi_bdev with a gendisk pointer and partitions index 2017-08-23 12:49:55 -06:00
dm-zoned-reclaim.c dm zoned: use GFP_NOIO in I/O path 2017-07-26 15:55:43 -04:00
dm-zoned-target.c block: replace bi_bdev with a gendisk pointer and partitions index 2017-08-23 12:49:55 -06:00
dm-zoned.h dm zoned: drive-managed zoned block device target 2017-06-19 11:05:20 -04:00
dm.c dm: convert table_device.count from atomic_t to refcount_t 2017-10-24 15:09:51 -04:00
dm.h dm: convert dm_dev_internal.count from atomic_t to refcount_t 2017-10-24 15:09:51 -04:00
faulty.c block: replace bi_bdev with a gendisk pointer and partitions index 2017-08-23 12:49:55 -06:00
Kconfig dm zoned: drive-managed zoned block device target 2017-06-19 11:05:20 -04:00
linear.c block: replace bi_bdev with a gendisk pointer and partitions index 2017-08-23 12:49:55 -06:00
linear.h
Makefile dm zoned: drive-managed zoned block device target 2017-06-19 11:05:20 -04:00
md-cluster.c
md-cluster.h
md.c md: fix a race condition for flush request handling 2017-09-27 20:08:18 -07:00
md.h md: separate request handling 2017-09-27 20:07:40 -07:00
multipath.c block: replace bi_bdev with a gendisk pointer and partitions index 2017-08-23 12:49:55 -06:00
multipath.h
raid0.c Merge tag 'md/4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md 2017-09-07 12:41:48 -07:00
raid0.h
raid1-10.c md: raid1-10: move raid1/raid10 common code into raid1-10.c 2017-07-21 12:47:20 -07:00
raid1.c Merge tag 'md/4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md 2017-09-07 12:41:48 -07:00
raid1.h
raid5-cache.c Merge tag 'md/4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md 2017-09-07 12:41:48 -07:00
raid5-log.h
raid5-ppl.c Merge tag 'md/4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md 2017-09-07 12:41:48 -07:00
raid5.c md/raid5: cap worker count 2017-09-27 20:08:44 -07:00
raid5.h
raid10.c Merge tag 'md/4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md 2017-09-07 12:41:48 -07:00
raid10.h