NeilBrown fd16f2e848 md/raid10: stop using bi_phys_segments ... raid10 currently repurposes bi_phys_segments on each incoming bio to count how many r10bio was used to encode the request. We need to know when the number of attached r10bio reaches zero to: 1/ call bio_endio() when all IO on the bio is finished 2/ decrement ->nr_pending so that resync IO can proceed. Now that the bio has its own __bi_remaining counter, that can be used instead. We can call bio_inc_remaining to increment the counter and call bio_endio() every time an r10bio completes, rather than only when bi_phys_segments reaches zero. This addresses point 1, but not point 2. bio_endio() doesn't (and cannot) report when the last r10bio has finished, so a different approach is needed. So: instead of counting bios in ->nr_pending, count r10bios. i.e. every time we attach a bio, increment nr_pending. Every time an r10bio completes, decrement nr_pending. Normally we only increment nr_pending after first checking that ->barrier is zero, or some other non-trivial tests and possible waiting. When attaching multiple r10bios to a bio, we only need the tests and the waiting once. After the first increment, subsequent increments can happen unconditionally as they are really all part of the one request. So introduce inc_pending() which can be used when we know that nr_pending is already elevated. Note that this fixes a bug. freeze_array() contains the line atomic_read(&conf->nr_pending) == conf->nr_queued+extra, which implies that the units for ->nr_pending, ->nr_queued and extra are the same. ->nr_queue and extra count r10_bios, but prior to this patch, ->nr_pending counted bios. If a bio ever resulted in multiple r10_bios (due to bad blocks), freeze_array() would not work correctly. Now it does. Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: Shaohua Li <shli@fb.com>		2017-03-22 19:17:41 -07:00
..
bcache	drivers/md/bcache/util.h: remove duplicate inclusion of blkdev.h	2017-03-09 17:01:10 -08:00
persistent-data	sched/headers: Prepare to move the get_task_struct()/put_task_struct() and related APIs from <linux/sched.h> to <linux/sched/task.h>	2017-03-02 08:42:40 +01:00
bitmap.c	md: move bitmap_destroy to the beginning of __md_stop	2017-03-16 16:55:58 -07:00
bitmap.h	md: move bitmap_destroy to the beginning of __md_stop	2017-03-16 16:55:58 -07:00
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-record.h
dm-bufio.c	sched/headers: Prepare to move the memalloc_noio_*() APIs to <linux/sched/mm.h>	2017-03-02 08:42:33 +01:00
dm-bufio.h
dm-builtin.c	dm: move request-based code out to dm-rq.[hc]	2016-06-10 15:15:44 -04:00
dm-cache-block-types.h	linux: drop __bitwise__ everywhere	2016-12-16 00:13:41 +02:00
dm-cache-metadata.c	dm cache metadata: use cursor api in blocks_are_clean_separate_dirty()	2017-02-16 13:12:51 -05:00
dm-cache-metadata.h	dm cache metadata: add "metadata2" feature	2017-02-16 13:12:47 -05:00
dm-cache-policy-cleaner.c	dm cache: speed up writing of the hint array	2016-09-22 11:15:02 -04:00
dm-cache-policy-internal.h	dm cache: speed up writing of the hint array	2016-09-22 11:15:02 -04:00
dm-cache-policy-smq.c	dm cache policy smq: use hash_32() instead of hash_32_generic()	2016-12-08 19:42:37 -05:00
dm-cache-policy.c
dm-cache-policy.h	dm cache: speed up writing of the hint array	2016-09-22 11:15:02 -04:00
dm-cache-target.c	- Fix dm-raid transient device failure processing and other smaller	2017-02-21 12:11:41 -08:00
dm-core.h	dm: always defer request allocation to the owner of the request_queue	2017-01-27 15:08:35 -07:00
dm-crypt.c	KEYS: Differentiate uses of rcu_dereference_key() and user_key_payload()	2017-03-02 10:09:00 +11:00
dm-delay.c	dm: rename target's per_bio_data_size to per_io_data_size	2016-02-22 22:34:37 -05:00
dm-era-target.c	block: Use pointer to backing_dev_info from request_queue	2017-02-02 08:20:48 -07:00
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	2016-01-08 20:03:05 -05:00
dm-flakey.c	dm flakey: introduce "error_writes" feature	2016-12-13 15:01:31 -05:00
dm-io.c	dm io: use bvec iterator helpers to implement .get_page and .next_page	2016-11-21 09:51:57 -05:00
dm-ioctl.c	sched/headers: Prepare to move the memalloc_noio_*() APIs to <linux/sched/mm.h>	2017-03-02 08:42:33 +01:00
dm-kcopyd.c	dm: move request-based code out to dm-rq.[hc]	2016-06-10 15:15:44 -04:00
dm-linear.c	libnvdimm for 4.8	2016-07-28 17:38:16 -07:00
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	Merge branch 'for-4.9/block' of git://git.kernel.dk/linux-block	2016-10-07 14:42:05 -07:00
dm-log.c	block,fs: use REQ_* flags directly	2016-11-01 09:43:26 -06:00
dm-mpath.c	Merge branch 'for-4.11/next' into for-4.11/linus-merge	2017-02-17 14:08:19 -07:00
dm-mpath.h
dm-path-selector.c
dm-path-selector.h	dm path selector: remove 'repeat_count' return from .select_path hook	2016-02-22 22:34:42 -05:00
dm-queue-length.c	dm path selector: remove 'repeat_count' return from .select_path hook	2016-02-22 22:34:42 -05:00
dm-raid1.c	Merge branch 'for-4.10/block' of git://git.kernel.dk/linux-block	2016-12-13 10:19:16 -08:00
dm-raid.c	dm raid: bump the target version	2017-02-28 16:47:52 -05:00
dm-region-hash.c	block: rename bio bi_rw to bi_opf	2016-08-07 14:41:02 -06:00
dm-round-robin.c	dm round robin: revert "use percpu 'repeat_count' and 'current_path'"	2017-02-17 00:54:09 -05:00
dm-rq.c	dm-rq: don't dereference request payload after ending request	2017-02-24 13:19:32 -07:00
dm-rq.h	dm: always defer request allocation to the owner of the request_queue	2017-01-27 15:08:35 -07:00
dm-service-time.c	dm path selector: remove 'repeat_count' return from .select_path hook	2016-02-22 22:34:42 -05:00
dm-snap-persistent.c	block,fs: use REQ_* flags directly	2016-11-01 09:43:26 -06:00
dm-snap-transient.c	dm snapshot: fix hung bios when copy error occurs	2016-01-08 20:03:05 -05:00
dm-snap.c	block: rename bio bi_rw to bi_opf	2016-08-07 14:41:02 -06:00
dm-stats.c	dm stats: fix a leaked s->histogram_boundaries array	2017-02-16 14:17:07 -05:00
dm-stats.h
dm-stripe.c	block: rename bio bi_rw to bi_opf	2016-08-07 14:41:02 -06:00
dm-switch.c	dm switch: simplify conditional in alloc_region_table()	2015-10-31 19:06:06 -04:00
dm-sysfs.c	dm: move request-based code out to dm-rq.[hc]	2016-06-10 15:15:44 -04:00
dm-table.c	block: Use pointer to backing_dev_info from request_queue	2017-02-02 08:20:48 -07:00
dm-target.c	dm: always defer request allocation to the owner of the request_queue	2017-01-27 15:08:35 -07:00
dm-thin-metadata.c	dm thin: fix a race condition between discarding and provisioning a block	2016-07-20 12:43:35 -04:00
dm-thin-metadata.h	dm thin: fix a race condition between discarding and provisioning a block	2016-07-20 12:43:35 -04:00
dm-thin.c	block: Use pointer to backing_dev_info from request_queue	2017-02-02 08:20:48 -07:00
dm-uevent.c
dm-uevent.h
dm-verity-fec.c	dm verity fec: fix block calculation	2016-07-01 23:29:08 -04:00
dm-verity-fec.h	dm verity: add support for forward error correction	2015-12-10 10:39:03 -05:00
dm-verity-target.c	dm verity: fix incorrect error message	2016-11-21 09:52:01 -05:00
dm-verity.h	dm verity: add ignore_zero_blocks feature	2015-12-10 10:39:03 -05:00
dm-zero.c	block: rename bio bi_rw to bi_opf	2016-08-07 14:41:02 -06:00
dm.c	blk: Ensure users for current->bio_list can see the full list.	2017-03-11 15:31:37 -07:00
dm.h	dm: always defer request allocation to the owner of the request_queue	2017-01-27 15:08:35 -07:00
faulty.c	md: fast clone bio in bio_clone_mddev()	2017-02-15 11:24:54 -08:00
Kconfig	dm block manager: make block locking optional	2016-11-14 15:17:47 -05:00
linear.c	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md	2017-02-24 14:42:19 -08:00
linear.h	md linear: fix a race between linear_add() and linear_congested()	2017-02-13 09:17:50 -08:00
Makefile	raid5-ppl: Partial Parity Log write logging implementation	2017-03-16 16:55:54 -07:00
md-cluster.c	md-cluster: add the support for resize	2017-03-16 16:55:50 -07:00
md-cluster.h	md-cluster: add the support for resize	2017-03-16 16:55:50 -07:00
md.c	md/raid5: use md_write_start to count stripes, not bios	2017-03-22 19:15:42 -07:00
md.h	md/raid5: use md_write_start to count stripes, not bios	2017-03-22 19:15:42 -07:00
multipath.c	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md	2017-02-24 14:42:19 -08:00
multipath.h
raid0.c	md: superblock changes for PPL	2017-03-16 16:55:53 -07:00
raid0.h	block: kill merge_bvec_fn() completely	2015-08-13 12:31:57 -06:00
raid1.c	md/raid1, raid10: move rXbio accounting closer to allocation.	2017-03-22 19:17:24 -07:00
raid1.h	RAID1: avoid unnecessary spin locks in I/O barrier code	2017-02-19 22:04:25 -08:00
raid5-cache.c	md/raid5: use bio_inc_remaining() instead of repurposing bi_phys_segments as a counter	2017-03-22 19:16:30 -07:00
raid5-log.h	md/raid5: call bio_endio() directly rather than queueing for later.	2017-03-22 19:16:12 -07:00
raid5-ppl.c	raid5-ppl: runtime PPL enabling or disabling	2017-03-16 16:55:56 -07:00
raid5.c	Revert "md/raid5: limit request size according to implementation limits"	2017-03-22 19:17:12 -07:00
raid5.h	md/raid5: remove over-loading of ->bi_phys_segments.	2017-03-22 19:16:56 -07:00
raid10.c	md/raid10: stop using bi_phys_segments	2017-03-22 19:17:41 -07:00
raid10.h	md/raid10: add failfast handling for reads.	2016-11-22 09:14:28 -08:00