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Tang Junhui ebd67e20fb bcache: segregate flash only volume write streams 
[ Upstream commit 4eca1cb28d ]

In such scenario that there are some flash only volumes
, and some cached devices, when many tasks request these devices in
writeback mode, the write IOs may fall to the same bucket as bellow:
| cached data | flash data | cached data | cached data| flash data|
then after writeback of these cached devices, the bucket would
be like bellow bucket:
| free | flash data | free | free | flash data |

So, there are many free space in this bucket, but since data of flash
only volumes still exists, so this bucket cannot be reclaimable,
which would cause waste of bucket space.

In this patch, we segregate flash only volume write streams from
cached devices, so data from flash only volumes and cached devices
can store in different buckets.

Compare to v1 patch, this patch do not add a additionally open bucket
list, and it is try best to segregate flash only volume write streams
from cached devices, sectors of flash only volumes may still be mixed
with dirty sectors of cached device, but the number is very small.

[mlyle: fixed commit log formatting, permissions, line endings]

Signed-off-by: Tang Junhui <tang.junhui@zte.com.cn>
Reviewed-by: Michael Lyle <mlyle@lyle.org>
Signed-off-by: Michael Lyle <mlyle@lyle.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-04-13 19:50:22 +02:00
..
bcache bcache: segregate flash only volume write streams 2018-04-13 19:50:22 +02:00
persistent-data dm btree: fix serious bug in btree_split_beneath() 2018-01-23 19:50:16 +01:00
bitmap.c md/bitmap: disable bitmap_resize for file-backed bitmaps. 2017-09-27 11:00:14 +02:00
bitmap.h md-cluster: Use a small window for resync 2015-10-12 01:32:05 -05:00
dm-bio-prison.c block: add a bi_error field to struct bio 2015-07-29 08:55:15 -06:00
dm-bio-prison.h dm bio prison: add dm_cell_promote_or_release() 2015-05-29 14:19:06 -04:00
dm-bio-record.h
dm-bufio.c dm bufio: fix shrinker scans when (nr_to_scan < retain_target) 2018-01-17 09:35:24 +01:00
dm-bufio.h
dm-builtin.c
dm-cache-block-types.h
dm-cache-metadata.c dm cache metadata: fail operations if fail_io mode has been established 2017-05-25 14:30:08 +02:00
dm-cache-metadata.h dm cache: make sure every metadata function checks fail_io 2016-04-12 09:08:40 -07:00
dm-cache-policy-cleaner.c - Revert a dm-multipath change that caused a regression for unprivledged 2015-11-04 21:19:53 -08:00
dm-cache-policy-internal.h dm cache: age and write back cache entries even without active IO 2015-06-11 17:13:01 -04:00
dm-cache-policy-mq.c dm: convert ffs to __ffs 2015-10-31 19:06:01 -04:00
dm-cache-policy-smq.c dm: convert ffs to __ffs 2015-10-31 19:06:01 -04:00
dm-cache-policy.c
dm-cache-policy.h dm cache: age and write back cache entries even without active IO 2015-06-11 17:13:01 -04:00
dm-cache-target.c dm cache: fix corruption seen when using cache > 2TB 2017-03-12 06:37:26 +01:00
dm-crypt.c dm crypt: mark key as invalid until properly loaded 2017-01-06 11:16:15 +01:00
dm-delay.c dm delay: document that offsets are specified in sectors 2015-10-31 19:06:05 -04:00
dm-era-target.c dm era: save spacemap metadata root after the pre-commit 2017-05-20 14:27:00 +02:00
dm-exception-store.c - Revert a dm-multipath change that caused a regression for unprivledged 2015-11-04 21:19:53 -08:00
dm-exception-store.h dm snapshot: fix hung bios when copy error occurs 2016-03-03 15:07:14 -08:00
dm-flakey.c dm flakey: return -EINVAL on interval bounds error in flakey_ctr() 2017-01-06 11:16:15 +01:00
dm-io.c dm io: fix duplicate bio completion due to missing ref count 2018-03-11 16:19:47 +01:00
dm-ioctl.c dm ioctl: remove double parentheses 2018-04-08 11:51:57 +02:00
dm-kcopyd.c mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd 2015-11-06 17:50:42 -08:00
dm-linear.c dm linear: remove redundant target name from error messages 2015-10-31 19:06:03 -04:00
dm-log-userspace-base.c dm: drop NULL test before kmem_cache_destroy() and mempool_destroy() 2015-10-31 19:06:00 -04:00
dm-log-userspace-transfer.c
dm-log-userspace-transfer.h
dm-log-writes.c dm log writes: fix bug with too large bios 2016-10-07 15:23:47 +02:00
dm-log.c
dm-mpath.c dm mpath: check if path's request_queue is dying in activate_path() 2016-10-28 03:01:28 -04:00
dm-mpath.h
dm-path-selector.c
dm-path-selector.h
dm-queue-length.c
dm-raid.c dm raid: fix round up of default region size 2015-10-02 12:02:31 -04:00
dm-raid1.c dm mirror: fix read error on recovery after default leg failure 2016-11-10 16:36:35 +01:00
dm-region-hash.c dm: convert ffs to __ffs 2015-10-31 19:06:01 -04:00
dm-round-robin.c
dm-service-time.c
dm-snap-persistent.c dm snapshot: fix hung bios when copy error occurs 2016-03-03 15:07:14 -08:00
dm-snap-transient.c dm snapshot: fix hung bios when copy error occurs 2016-03-03 15:07:14 -08:00
dm-snap.c dm snapshot: disallow the COW and origin devices from being identical 2016-04-12 09:08:39 -07:00
dm-stats.c dm stats: fix a leaked s->histogram_boundaries array 2017-03-12 06:37:26 +01:00
dm-stats.h dm stats: support precise timestamps 2015-06-17 12:40:40 -04:00
dm-stripe.c Merge tag 'dm-4.3-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm 2015-09-02 16:35:26 -07:00
dm-switch.c dm switch: simplify conditional in alloc_region_table() 2015-10-31 19:06:06 -04:00
dm-sysfs.c
dm-table.c dm snapshot: disallow the COW and origin devices from being identical 2016-04-12 09:08:39 -07:00
dm-target.c
dm-thin-metadata.c dm thin metadata: THIN_MAX_CONCURRENT_LOCKS should be 6 2018-01-23 19:50:17 +01:00
dm-thin-metadata.h dm thin metadata: add dm_thin_remove_range() 2015-06-11 17:13:04 -04:00
dm-thin.c dm thin: fix race condition when destroying thin pool workqueue 2016-03-03 15:07:10 -08:00
dm-uevent.c
dm-uevent.h
dm-verity.c dm: refactor ioctl handling 2015-10-31 19:05:59 -04:00
dm-zero.c block: add a bi_error field to struct bio 2015-07-29 08:55:15 -06:00
dm.c dm: correctly handle chained bios in dec_pending() 2018-02-22 15:45:01 +01:00
dm.h block: kill merge_bvec_fn() completely 2015-08-13 12:31:57 -06:00
faulty.c block: add a bi_error field to struct bio 2015-07-29 08:55:15 -06:00
Kconfig dm raid: select the Kconfig option CONFIG_MD_RAID0 2017-05-25 14:30:07 +02:00
linear.c md/linear: shutup lockdep warnning 2017-10-21 17:09:05 +02:00
linear.h md linear: fix a race between linear_add() and linear_congested() 2017-03-12 06:37:30 +01:00
Makefile raid5: add basic stripe log 2015-10-24 17:16:19 +11:00
md-cluster.c md-cluster: fix potential lock issue in add_new_disk 2018-04-13 19:50:09 +02:00
md-cluster.h md-cluster: Fix adding of new disk with new reload code 2015-10-12 03:35:30 -05:00
md.c md: avoid warning for 32-bit sector_t 2018-02-25 11:03:44 +01:00
md.h md/raid: only permit hot-add of compatible integrity profiles 2016-02-17 12:30:57 -08:00
multipath.c md: multipath: don't hardcopy bio in .make_request path 2016-04-12 09:08:57 -07:00
multipath.h
raid0.c md/raid0: apply base queue limits *before* disk_stack_limits 2015-10-02 17:23:44 +10:00
raid0.h block: kill merge_bvec_fn() completely 2015-08-13 12:31:57 -06:00
raid1.c md: don't use flush_signals in userspace processes 2017-07-27 15:06:06 -07:00
raid1.h md-cluster: Use a small window for resync 2015-10-12 01:32:05 -05:00
raid5-cache.c raid5-cache: start raid5 readonly if journal is missing 2015-11-01 13:48:29 +11:00
raid5.c md/raid5: make use of spin_lock_irq over local_irq_disable + spin_lock 2018-04-13 19:50:00 +02:00
raid5.h RAID5: revert e9e4c377e2 to fix a livelock 2016-04-12 09:08:57 -07:00
raid10.c md/raid10: reset the 'first' at the end of loop 2018-04-08 11:52:01 +02:00
raid10.h md/raid10: ensure device failure recorded before write request returns. 2015-08-31 19:43:45 +02:00