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Coly Li d5d6b58872 bcache: add readahead cache policy options via sysfs interface 
commit 038ba8cc1b upstream.

In year 2007 high performance SSD was still expensive, in order to
save more space for real workload or meta data, the readahead I/Os
for non-meta data was bypassed and not cached on SSD.

In now days, SSD price drops a lot and people can find larger size
SSD with more comfortable price. It is unncessary to alway bypass
normal readahead I/Os to save SSD space for now.

This patch adds options for readahead data cache policies via sysfs
file /sys/block/bcache<N>/readahead_cache_policy, the options are,
- "all": cache all readahead data I/Os.
- "meta-only": only cache meta data, and bypass other regular I/Os.

If users want to make bcache continue to only cache readahead request
for metadata and bypass regular data readahead, please set "meta-only"
to this sysfs file. By default, bcache will back to cache all read-
ahead requests now.

Cc: stable@vger.kernel.org
Signed-off-by: Coly Li <colyli@suse.de>
Acked-by: Eric Wheeler <bcache@linux.ewheeler.net>
Cc: Michael Lyle <mlyle@lyle.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2020-02-11 04:35:37 -08:00
..
bcache bcache: add readahead cache policy options via sysfs interface 2020-02-11 04:35:37 -08:00
persistent-data dm space map common: fix to ensure new block isn't already in use 2020-02-11 04:35:26 -08:00
Kconfig dm: add clone target 2019-09-12 09:32:31 -04:00
Makefile dm: add clone target 2019-09-12 09:32:31 -04:00
dm-bio-prison-v1.c
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dm-bio-prison-v1.h
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dm-bio-prison-v2.c
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dm-bio-prison-v2.h
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dm-bio-record.h
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dm-bufio.c dm bufio: introduce a global cache replacement 2019-09-13 17:00:21 -04:00
dm-builtin.c
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dm-cache-background-tracker.c
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dm-cache-background-tracker.h
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dm-cache-block-types.h
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dm-cache-metadata.c dm cache metadata: Fix loading discard bitset 2019-04-18 16:18:25 -04:00
dm-cache-metadata.h
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dm-cache-policy-internal.h
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dm-cache-policy-smq.c
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dm-cache-policy.c
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dm-cache-policy.h
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dm-cache-target.c dm cache: fix bugs when a GFP_NOWAIT allocation fails 2019-10-17 11:13:50 -04:00
dm-clone-metadata.c dm clone metadata: Use a two phase commit 2019-12-21 11:05:00 +01:00
dm-clone-metadata.h dm clone metadata: Use a two phase commit 2019-12-21 11:05:00 +01:00
dm-clone-target.c dm clone: Flush destination device before committing metadata 2019-12-21 11:05:01 +01:00
dm-core.h dm: disable DISCARD if the underlying storage no longer supports it 2019-04-04 15:33:59 -04:00
dm-crypt.c dm crypt: fix benbi IV constructor crash if used in authenticated mode 2020-02-11 04:35:26 -08:00
dm-delay.c dm delay: fix a crash when invalid device is specified 2019-04-26 11:29:32 -04:00
dm-dust.c dm dust: use dust block size for badblocklist index 2019-08-21 11:27:17 -04:00
dm-era-target.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
dm-exception-store.c
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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: Kill gfp_t argument of blkdev_report_zones() 2019-07-11 20:04:37 -06:00
dm-init.c docs: device-mapper: move it to the admin-guide 2019-07-15 11:03:01 -03:00
dm-integrity.c block: centralize PI remapping logic to the block layer 2019-09-17 20:03:49 -06:00
dm-io.c
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dm-ioctl.c dm: introduce DM_GET_TARGET_VERSION 2019-09-16 10:18:01 -04:00
dm-kcopyd.c dm kcopyd: always complete failed jobs 2019-08-15 15:57:39 -04:00
dm-linear.c block: Kill gfp_t argument of blkdev_report_zones() 2019-07-11 20:04:37 -06:00
dm-log-userspace-base.c
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dm-log-userspace-transfer.c
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dm-log-userspace-transfer.h
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dm-log-writes.c dm log writes: fix incorrect comment about the logged sequence example 2019-07-09 14:13:33 -04:00
dm-log.c
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dm-mpath.c dm mpath: remove harmful bio-based optimization 2019-12-21 11:04:56 +01:00
dm-mpath.h
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dm-path-selector.c
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dm-path-selector.h
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dm-queue-length.c
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dm-raid.c dm raid: fix updating of max_discard_sectors limit 2019-09-11 16:18:23 -04:00
dm-raid1.c dm raid1: use struct_size() with kzalloc() 2019-08-26 11:05:32 -04:00
dm-region-hash.c
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dm-round-robin.c
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dm-rq.c block: Delay default elevator initialization 2019-09-05 19:52:34 -06:00
dm-rq.h
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dm-service-time.c
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dm-snap-persistent.c block: fix an integer overflow in logical block size 2020-01-23 08:22:32 +01:00
dm-snap-transient.c
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dm-snap.c dm snapshot: rework COW throttling to fix deadlock 2019-10-10 09:46:05 -04:00
dm-stats.c dm stats: use struct_size() helper 2019-09-04 09:39:22 -04:00
dm-stats.h
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dm-stripe.c
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dm-switch.c
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dm-sysfs.c
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dm-table.c dm: make dm_table_find_target return NULL 2019-08-23 10:13:12 -04:00
dm-target.c dm mpath: fix missing call of path selector type->end_io 2019-04-25 15:38:52 -04:00
dm-thin-metadata.c dm thin metadata: use pool locking at end of dm_pool_metadata_close 2020-02-11 04:35:26 -08:00
dm-thin-metadata.h dm thin metadata: Add support for a pre-commit callback 2019-12-21 11:05:01 +01:00
dm-thin.c dm thin: fix use-after-free in metadata_pre_commit_callback 2020-02-05 21:22:53 +00:00
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
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dm-verity-fec.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
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: add root hash pkcs#7 signature verification 2019-08-23 10:13:14 -04:00
dm-verity-verify-sig.c dm verity: add root hash pkcs#7 signature verification 2019-08-23 10:13:14 -04:00
dm-verity-verify-sig.h dm verity: add root hash pkcs#7 signature verification 2019-08-23 10:13:14 -04:00
dm-verity.h dm verity: add root hash pkcs#7 signature verification 2019-08-23 10:13:14 -04:00
dm-writecache.c dm writecache: fix incorrect flush sequence when doing SSD mode commit 2020-02-11 04:35:26 -08:00
dm-zero.c
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dm-zoned-metadata.c dm zoned: support zone sizes smaller than 128MiB 2020-02-11 04:35:26 -08:00
dm-zoned-reclaim.c dm zoned: reduce overhead of backing device checks 2019-12-17 19:56:12 +01:00
dm-zoned-target.c dm zoned: reduce overhead of backing device checks 2019-12-17 19:56:12 +01:00
dm-zoned.h dm zoned: reduce overhead of backing device checks 2019-12-17 19:56:12 +01:00
dm.c dm: fix potential for q->make_request_fn NULL pointer 2020-02-11 04:35:27 -08:00
dm.h dm: make dm_table_find_target return NULL 2019-08-23 10:13:12 -04:00
md-bitmap.c md/bitmap: avoid race window between md_bitmap_resize and bitmap_file_clear_bit 2019-12-31 16:44:20 +01:00
md-bitmap.h
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md-cluster.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 45 2019-05-24 17:27:12 +02:00
md-cluster.h
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md-faulty.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 47 2019-05-24 17:27:13 +02:00
md-linear.c md: improve handling of bio with REQ_PREFLUSH in md_flush_request() 2019-12-17 19:56:14 +01:00
md-linear.h
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md-multipath.c md: improve handling of bio with REQ_PREFLUSH in md_flush_request() 2019-12-17 19:56:14 +01:00
md-multipath.h
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md.c md: make sure desc_nr less than MD_SB_DISKS 2020-01-04 19:18:34 +01:00
md.h md: improve handling of bio with REQ_PREFLUSH in md_flush_request() 2019-12-17 19:56:14 +01:00
raid0.c block: fix an integer overflow in logical block size 2020-01-23 08:22:32 +01:00
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: raid1: check rdev before reference in raid1_sync_request func 2020-01-09 10:19:48 +01:00
raid1.h
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raid5-cache.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 288 2019-06-05 17:36:37 +02:00
raid5-log.h raid5: set write hint for PPL 2019-03-12 10:15:18 -07:00
raid5-ppl.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 288 2019-06-05 17:36:37 +02:00
raid5.c raid5: need to set STRIPE_HANDLE for batch head 2020-01-09 10:19:48 +01:00
raid5.h raid5: use bio_end_sector in r5_next_bio 2019-09-13 13:14:43 -07:00
raid10.c md: improve handling of bio with REQ_PREFLUSH in md_flush_request() 2019-12-17 19:56:14 +01:00
raid10.h
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