Tomasz Majchrzak d82dd0e34d raid1: prefer disk without bad blocks ... If an array consists of two drives and the first drive has the bad block, the read request to the region overlapping the bad block chooses the same disk (with bad block) as device to read from over and over and the request gets stuck. If the first disk only partially overlaps with bad block, it becomes a candidate ("best disk") for shorter range of sectors. The second disk is capable of reading the entire requested range and it is updated accordingly, however it is not recorded as a best device for the request. In the end the request is sent to the first disk to read entire range of sectors. It fails and is re-tried in a moment but with the same outcome. Actually it is quite likely scenario but it had little exposure in my test until commit 715d40b93b10 ("md/raid1: add failfast handling for reads.") removed preference for idle disk. Such scenario had been passing as second disk was always chosen when idle. Reset a candidate ("best disk") to read from if disk can read entire range. Do it only if other disk has already been chosen as a candidate for a smaller range. The head position / disk type logic will select the best disk to read from - it is fine as disk with bad block won't be considered for it. Signed-off-by: Tomasz Majchrzak <tomasz.majchrzak@intel.com> Signed-off-by: Shaohua Li <shli@fb.com>		2017-05-12 14:41:15 -07:00
..
bcache	drivers/md/bcache/util.h: remove duplicate inclusion of blkdev.h	2017-03-09 17:01:10 -08:00
persistent-data	dm block manager: remove an unused argument from dm_block_manager_create()	2017-04-27 17:08:41 -04:00
bitmap.c	md: fix several trivial typos in comments	2017-03-23 22:54:57 -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-v1.c	dm bio prison v2: new interface for the bio prison	2017-03-07 11:30:16 -05:00
dm-bio-prison-v1.h	dm bio prison v2: new interface for the bio prison	2017-03-07 11:30:16 -05:00
dm-bio-prison-v2.c	dm bio prison v2: new interface for the bio prison	2017-03-07 11:30:16 -05:00
dm-bio-prison-v2.h	dm bio prison v2: new interface for the bio prison	2017-03-07 11:30:16 -05:00
dm-bio-record.h
dm-bufio.c	dm bufio: check new buffer allocation watermark every 30 seconds	2017-05-01 15:21:42 -04:00
dm-bufio.h	dm bufio: add sector start offset to dm-bufio interface	2017-03-07 13:28:33 -05:00
dm-builtin.c	dm: move request-based code out to dm-rq.[hc]	2016-06-10 15:15:44 -04:00
dm-cache-background-tracker.c	dm cache: significant rework to leverage dm-bio-prison-v2	2017-03-07 13:28:31 -05:00
dm-cache-background-tracker.h	dm cache: significant rework to leverage dm-bio-prison-v2	2017-03-07 13:28:31 -05:00
dm-cache-block-types.h	linux: drop __bitwise__ everywhere	2016-12-16 00:13:41 +02:00
dm-cache-metadata.c	- A major update for DM cache that reduces the latency for deciding	2017-05-03 10:31:20 -07:00
dm-cache-metadata.h	dm cache: significant rework to leverage dm-bio-prison-v2	2017-03-07 13:28:31 -05:00
dm-cache-policy-internal.h	dm cache: significant rework to leverage dm-bio-prison-v2	2017-03-07 13:28:31 -05:00
dm-cache-policy-smq.c	dm cache policy smq: make the cleaner policy write-back more aggressively	2017-03-31 11:41:05 -04:00
dm-cache-policy.c
dm-cache-policy.h	dm cache: significant rework to leverage dm-bio-prison-v2	2017-03-07 13:28:31 -05:00
dm-cache-target.c	- A major update for DM cache that reduces the latency for deciding	2017-05-03 10:31:20 -07:00
dm-core.h	- A major update for DM cache that reduces the latency for deciding	2017-05-03 10:31:20 -07:00
dm-crypt.c	- A major update for DM cache that reduces the latency for deciding	2017-05-03 10:31:20 -07:00
dm-delay.c	dm: mark targets that pass integrity data	2017-04-24 12:04:32 -04:00
dm-era-target.c	dm block manager: remove an unused argument from dm_block_manager_create()	2017-04-27 17:08:41 -04:00
dm-exception-store.c
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-integrity.c	dm integrity: use previously calculated log2 of sectors_per_block	2017-04-27 12:16:32 -04:00
dm-io.c	dm: support REQ_OP_WRITE_ZEROES	2017-04-08 11:25:38 -06:00
dm-ioctl.c	dm: introduce enum dm_queue_mode to cleanup related code	2017-04-27 17:08:44 -04:00
dm-kcopyd.c	dm kcopyd: switch to use REQ_OP_WRITE_ZEROES	2017-04-08 11:25:38 -06:00
dm-linear.c	- A major update for DM cache that reduces the latency for deciding	2017-05-03 10:31:20 -07:00
dm-log-userspace-base.c
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	- A major update for DM cache that reduces the latency for deciding	2017-05-03 10:31:20 -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-raid.c	- A major update for DM cache that reduces the latency for deciding	2017-05-03 10:31:20 -07:00
dm-raid1.c	block: remove the discard_zeroes_data flag	2017-04-08 11:25:38 -06:00
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	- A major update for DM cache that reduces the latency for deciding	2017-05-03 10:31:20 -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	- A major update for DM cache that reduces the latency for deciding	2017-05-03 10:31:20 -07:00
dm-switch.c
dm-sysfs.c	dm: move request-based code out to dm-rq.[hc]	2016-06-10 15:15:44 -04:00
dm-table.c	- A major update for DM cache that reduces the latency for deciding	2017-05-03 10:31:20 -07:00
dm-target.c	dm: introduce a new DM_MAPIO_KILL return value	2017-05-01 18:19:03 -04:00
dm-thin-metadata.c	dm block manager: remove an unused argument from dm_block_manager_create()	2017-04-27 17:08:41 -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	- A major update for DM cache that reduces the latency for deciding	2017-05-03 10:31:20 -07:00
dm-uevent.c
dm-uevent.h
dm-verity-fec.c	- A major update for DM cache that reduces the latency for deciding	2017-05-03 10:31:20 -07:00
dm-verity-fec.h	dm verity fec: limit error correction recursion	2017-03-16 09:37:31 -04:00
dm-verity-target.c	dm verity: switch to using asynchronous hash crypto API	2017-04-24 15:37:04 -04:00
dm-verity.h	dm verity: switch to using asynchronous hash crypto API	2017-04-24 15:37:04 -04:00
dm-zero.c	block: rename bio bi_rw to bi_opf	2016-08-07 14:41:02 -06:00
dm.c	- A major update for DM cache that reduces the latency for deciding	2017-05-03 10:31:20 -07:00
dm.h	dm: introduce enum dm_queue_mode to cleanup related code	2017-04-27 17:08:44 -04:00
faulty.c	md: fast clone bio in bio_clone_mddev()	2017-02-15 11:24:54 -08:00
Kconfig	- A major update for DM cache that reduces the latency for deciding	2017-05-03 10:31:20 -07:00
linear.c	Merge branch 'md-next' into md-linus	2017-05-01 14:09:21 -07:00
linear.h	md linear: fix a race between linear_add() and linear_congested()	2017-02-13 09:17:50 -08:00
Makefile	- A major update for DM cache that reduces the latency for deciding	2017-05-03 10:31:20 -07:00
md-cluster.c	md-cluster: Fix a memleak in an error handling path	2017-04-14 08:08:29 -07:00
md-cluster.h	md-cluster: add the support for resize	2017-03-16 16:55:50 -07:00
md.c	md: don't return -EAGAIN in md_allow_write for external metadata arrays	2017-05-08 10:32:59 -07:00
md.h	md: don't return -EAGAIN in md_allow_write for external metadata arrays	2017-05-08 10:32:59 -07:00
multipath.c	md: support REQ_OP_WRITE_ZEROES	2017-04-08 11:25:38 -06:00
multipath.h
raid0.c	md/md0: optimize raid0 discard handling	2017-05-08 21:18:03 -07:00
raid0.h
raid1.c	raid1: prefer disk without bad blocks	2017-05-12 14:41:15 -07:00
raid1.h	md/raid1: Use a new variable to count flighting sync requests	2017-04-27 14:01:16 -07:00
raid5-cache.c	md/r5cache: handle sync with data in write back cache	2017-05-11 22:14:40 -07:00
raid5-log.h	md/r5cache: gracefully handle journal device errors for writeback mode	2017-05-11 22:11:11 -07:00
raid5-ppl.c	raid5-ppl: use a single mempool for ppl_io_unit and header_page	2017-04-11 14:56:46 -07:00
raid5.c	md/r5cache: handle sync with data in write back cache	2017-05-11 22:14:40 -07:00
raid5.h	- A major update for DM cache that reduces the latency for deciding	2017-05-03 10:31:20 -07:00
raid10.c	md/raid1/10: avoid unnecessary locking	2017-05-11 15:32:17 -07:00
raid10.h	md/raid10: simplify the splitting of requests.	2017-04-11 10:13:02 -07:00