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d2f96f487f
linux/drivers/md
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Shenghui Wang d2f96f487f bcache: add comment for cache_set->fill_iter 
We have the following define for btree iterator:
	struct btree_iter {
		size_t size, used;
	#ifdef CONFIG_BCACHE_DEBUG
		struct btree_keys *b;
	#endif
		struct btree_iter_set {
			struct bkey *k, *end;
		} data[MAX_BSETS];
	};

We can see that the length of data[] field is static MAX_BSETS, which is
defined as 4 currently.

But a btree node on disk could have too many bsets for an iterator to fit
on the stack - maybe far more that MAX_BSETS. Have to dynamically allocate
space to host more btree_iter_sets.

bch_cache_set_alloc() will make sure the pool cache_set->fill_iter can
allocate an iterator equipped with enough room that can host
	(sb.bucket_size / sb.block_size)
btree_iter_sets, which is more than static MAX_BSETS.

bch_btree_node_read_done() will use that pool to allocate one iterator, to
host many bsets in one btree node.

Add more comment around cache_set->fill_iter to make code less confusing.

Signed-off-by: Shenghui Wang <shhuiw@foxmail.com>
Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-13 08:15:54 -07:00
..
bcache bcache: add comment for cache_set->fill_iter 2018-12-13 08:15:54 -07:00
persistent-data dm: Avoid namespace collision with bitmap API 2018-08-01 15:49:38 -07:00
dm-bio-prison-v1.c dm: adjust structure members to improve alignment 2018-06-08 11:53:14 -04:00
dm-bio-prison-v1.h
dm-bio-prison-v2.c dm: adjust structure members to improve alignment 2018-06-08 11:53:14 -04:00
dm-bio-prison-v2.h
dm-bio-record.h
dm-bufio.c dm bufio: fix buffer alignment 2018-04-30 11:51:39 -04:00
dm-builtin.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
dm-cache-background-tracker.c dm cache background tracker: fix sparse warning 2018-04-30 15:40:40 -04:00
dm-cache-background-tracker.h
dm-cache-block-types.h
dm-cache-metadata.c dm cache metadata: ignore hints array being too small during resize 2018-10-04 15:20:51 -04:00
dm-cache-metadata.h
dm-cache-policy-internal.h
dm-cache-policy-smq.c dm: remove unnecessary unlikely() around WARN_ON_ONCE() 2018-10-16 14:34:59 -04:00
dm-cache-policy.c
dm-cache-policy.h
dm-cache-target.c dm cache: destroy migration_cache if cache target registration failed 2018-10-09 13:53:03 -04:00
dm-core.h dm: remove the pending IO accounting 2018-12-10 08:30:38 -07:00
dm-crypt.c dm crypt: make workqueue names device-specific 2018-10-18 12:17:17 -04:00
dm-delay.c dm delay: add flush as a third class of IO 2018-07-27 15:24:19 -04:00
dm-era-target.c dm: allow targets to return output from messages they are sent 2018-04-03 15:04:10 -04:00
dm-exception-store.c
dm-exception-store.h
dm-flakey.c block: add a report_zones method 2018-10-25 11:17:40 -06:00
dm-integrity.c Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2018-10-25 16:43:35 -07:00
dm-io.c dm: Use kzalloc for all structs with embedded biosets/mempools 2018-06-05 08:47:43 -06:00
dm-ioctl.c dm ioctl: harden copy_params()'s copy_from_user() from malicious users 2018-10-18 11:54:07 -04:00
dm-kcopyd.c dm kcopyd: avoid softlockup in run_complete_job 2018-08-08 09:16:24 -04:00
dm-linear.c block: add a report_zones method 2018-10-25 11:17:40 -06:00
dm-log-userspace-base.c dm: convert to bioset_init()/mempool_init() 2018-05-30 15:33:32 -06:00
dm-log-userspace-transfer.c
dm-log-userspace-transfer.h
dm-log-writes.c dax: Introduce a ->copy_to_iter dax operation 2018-05-22 23:18:31 -07:00
dm-log.c
dm-mpath.c dm: rename DM_TYPE_MQ_REQUEST_BASED to DM_TYPE_REQUEST_BASED 2018-10-11 11:36:09 -04:00
dm-mpath.h
dm-path-selector.c
dm-path-selector.h
dm-queue-length.c dm mpath selector: more evenly distribute ties 2018-01-29 13:44:58 -05:00
dm-raid1.c dm kcopyd: return void from dm_kcopyd_copy() 2018-07-31 17:33:21 -04:00
dm-raid.c dm raid: avoid bitmap with raid4/5/6 journal device 2018-10-18 15:13:48 -04:00
dm-region-hash.c - Error path bug fix for overflow tests (Dan) 2018-06-12 18:28:00 -07:00
dm-round-robin.c
dm-rq.c dm: fix request-based dm's use of dm_wait_for_completion 2018-12-11 07:40:02 -07:00
dm-rq.h dm: remove legacy request-based IO path 2018-10-11 11:36:09 -04:00
dm-service-time.c dm mpath selector: more evenly distribute ties 2018-01-29 13:44:58 -05:00
dm-snap-persistent.c dm bufio: move dm-bufio.h to include/linux/ 2018-04-03 15:04:23 -04:00
dm-snap-transient.c
dm-snap.c dm snapshot: remove stale FIXME in snapshot_map() 2018-08-08 20:50:58 -04:00
dm-stats.c treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
dm-stats.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
dm-stripe.c dax: Introduce a ->copy_to_iter dax operation 2018-05-22 23:18:31 -07:00
dm-switch.c treewide: Use array_size() in vmalloc() 2018-06-12 16:19:22 -07:00
dm-sysfs.c dm: remove legacy request-based IO path 2018-10-11 11:36:09 -04:00
dm-table.c block: add queue_is_mq() helper 2018-11-16 08:34:06 -07:00
dm-target.c dm: remove unused macro DM_MOD_NAME_SIZE 2018-04-03 15:04:15 -04:00
dm-thin-metadata.c dm thin metadata: fix __udivdi3 undefined on 32-bit 2018-09-17 11:49:34 -04:00
dm-thin-metadata.h
dm-thin.c dm thin: use refcount_t for thin_c reference counting 2018-10-16 14:27:03 -04:00
dm-uevent.c
dm-uevent.h
dm-unstripe.c dm unstripe: remove unnecessary header includes 2018-04-03 15:04:15 -04:00
dm-verity-fec.c dm: Remove VLA usage from hashes 2018-09-14 14:08:52 +08:00
dm-verity-fec.h dm: convert to bioset_init()/mempool_init() 2018-05-30 15:33:32 -06:00
dm-verity-target.c dm verity: fix crash on bufio buffer that was allocated with vmalloc 2018-09-04 11:25:25 -04:00
dm-verity.h dm verity: add 'check_at_most_once' option to only validate hashes once 2018-04-03 15:04:29 -04:00
dm-writecache.c dm writecache: remove disabled code in memory_entry() 2018-10-22 10:59:52 -04:00
dm-zero.c
dm-zoned-metadata.c dm zoned: fix various dmz_get_mblock() issues 2018-10-18 15:17:03 -04:00
dm-zoned-reclaim.c dm kcopyd: return void from dm_kcopyd_copy() 2018-07-31 17:33:21 -04:00
dm-zoned-target.c - Biggest change this cycle is to remove support for the legacy IO path 2018-10-26 12:57:38 -07:00
dm-zoned.h
dm.c dm: fix request-based dm's use of dm_wait_for_completion 2018-12-11 07:40:02 -07:00
dm.h dm: remove legacy request-based IO path 2018-10-11 11:36:09 -04:00
Kconfig dm: remove legacy request-based IO path 2018-10-11 11:36:09 -04:00
Makefile dm: add writecache target 2018-06-08 11:59:51 -04:00
md-bitmap.c md/bitmap: use mddev_suspend/resume instead of ->quiesce() 2018-10-10 11:03:34 -07:00
md-bitmap.h md: Avoid namespace collision with bitmap API 2018-08-01 15:49:39 -07:00
md-cluster.c md-cluster: remove suspend_info 2018-10-18 09:41:25 -07:00
md-cluster.h md-cluster: introduce resync_info_get interface for sanity check 2018-10-18 09:36:35 -07:00
md-faulty.c md: convert to bioset_init()/mempool_init() 2018-05-30 15:33:32 -06:00
md-linear.c md: convert to bioset_init()/mempool_init() 2018-05-30 15:33:32 -06:00
md-linear.h Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md 2017-11-14 16:07:26 -08:00
md-multipath.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
md-multipath.h md: convert to bioset_init()/mempool_init() 2018-05-30 15:33:32 -06:00
md.c block: stop passing 'cpu' to all percpu stats methods 2018-12-10 08:30:37 -07:00
md.h md-cluster/raid10: support add disk under grow mode 2018-10-18 09:34:56 -07:00
raid0.c blkcg: remove bio->bi_css and instead use bio->bi_blkg 2018-12-07 22:26:37 -07:00
raid0.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
raid1-10.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
raid1.c MD: fix invalid stored role for a disk - try2 2018-10-14 17:05:07 -07:00
raid1.h md: convert to bioset_init()/mempool_init() 2018-05-30 15:33:32 -06:00
raid5-cache.c md: remove redundant code that is no longer reachable 2018-10-10 10:45:15 -07:00
raid5-log.h md/raid5-cache: disable reshape completely 2018-08-31 17:38:09 -07:00
raid5-ppl.c md: convert to bioset_init()/mempool_init() 2018-05-30 15:33:32 -06:00
raid5.c raid5: block failing device if raid will be failed 2018-09-28 11:13:15 -07:00
raid5.h Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md 2018-06-09 12:01:36 -07:00
raid10.c md-cluster: introduce resync_info_get interface for sanity check 2018-10-18 09:36:35 -07:00
raid10.h md: convert to bioset_init()/mempool_init() 2018-05-30 15:33:32 -06:00