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linux/drivers/md
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Xiao Ni bcc90d2804 md/raid10: improve raid10 discard request 
Now the discard request is split by chunk size. So it takes a long time
to finish mkfs on disks which support discard function. This patch improve
handling raid10 discard request. It uses the similar way with patch
29efc390b (md/md0: optimize raid0 discard handling).

But it's a little complex than raid0. Because raid10 has different layout.
If raid10 is offset layout and the discard request is smaller than stripe
size. There are some holes when we submit discard bio to underlayer disks.

For example: five disks (disk1 - disk5)
D01 D02 D03 D04 D05
D05 D01 D02 D03 D04
D06 D07 D08 D09 D10
D10 D06 D07 D08 D09
The discard bio just wants to discard from D03 to D10. For disk3, there is
a hole between D03 and D08. For disk4, there is a hole between D04 and D09.
D03 is a chunk, raid10_write_request can handle one chunk perfectly. So
the part that is not aligned with stripe size is still handled by
raid10_write_request.

If reshape is running when discard bio comes and the discard bio spans the
reshape position, raid10_write_request is responsible to handle this
discard bio.

I did a test with this patch set.
Without patch:
time mkfs.xfs /dev/md0
real4m39.775s
user0m0.000s
sys0m0.298s

With patch:
time mkfs.xfs /dev/md0
real0m0.105s
user0m0.000s
sys0m0.007s

nvme3n1           259:1    0   477G  0 disk
└─nvme3n1p1       259:10   0    50G  0 part
nvme4n1           259:2    0   477G  0 disk
└─nvme4n1p1       259:11   0    50G  0 part
nvme5n1           259:6    0   477G  0 disk
└─nvme5n1p1       259:12   0    50G  0 part
nvme2n1           259:9    0   477G  0 disk
└─nvme2n1p1       259:15   0    50G  0 part
nvme0n1           259:13   0   477G  0 disk
└─nvme0n1p1       259:14   0    50G  0 part

Reviewed-by: Coly Li <colyli@suse.de>
Reviewed-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Signed-off-by: Xiao Ni <xni@redhat.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
2020-09-24 16:44:45 -07:00
..
bcache block: lift setting the readahead size into the block layer 2020-09-24 13:43:39 -06:00
persistent-data dm thin metadata: Fix use-after-free in dm_bm_set_read_only 2020-09-02 13:38:40 -04:00
dm-bio-prison-v1.c dm bio prison: replace spin_lock_irqsave with spin_lock_irq 2019-11-05 14:53:03 -05:00
dm-bio-prison-v1.h
dm-bio-prison-v2.c dm bio prison v2: use true/false for bool variable 2020-01-07 12:07:08 -05:00
dm-bio-prison-v2.h
dm-bio-record.h dm bio record: save/restore bi_end_io and bi_integrity 2020-03-03 10:02:46 -05:00
dm-bufio.c dm bufio: do buffer cleanup from a workqueue 2020-07-20 11:17:43 -04:00
dm-builtin.c
dm-cache-background-tracker.c
dm-cache-background-tracker.h
dm-cache-block-types.h
dm-cache-metadata.c dm cache metadata: Avoid returning cmd->bm wild pointer on error 2020-09-02 13:38:24 -04:00
dm-cache-metadata.h
dm-cache-policy-internal.h
dm-cache-policy-smq.c
dm-cache-policy.c
dm-cache-policy.h
dm-cache-target.c writeback: remove bdi->congested_fn 2020-07-08 17:20:46 -06:00
dm-clone-metadata.c dm clone metadata: Fix return type of dm_clone_nr_of_hydrated_regions() 2020-03-27 14:42:51 -04:00
dm-clone-metadata.h dm clone metadata: Fix return type of dm_clone_nr_of_hydrated_regions() 2020-03-27 14:42:51 -04:00
dm-clone-target.c writeback: remove bdi->congested_fn 2020-07-08 17:20:46 -06:00
dm-core.h
dm-crypt.c dm crypt: Initialize crypto wait structures 2020-09-01 16:41:57 -04:00
dm-delay.c block: rename generic_make_request to submit_bio_noacct 2020-07-01 07:27:24 -06:00
dm-dust.c dm dust: add interface to list all badblocks 2020-07-20 11:17:41 -04:00
dm-ebs-target.c dm ebs: Fix incorrect checking for REQ_OP_FLUSH 2020-08-04 16:01:40 -04:00
dm-era-target.c writeback: remove bdi->congested_fn 2020-07-08 17:20:46 -06:00
dm-exception-store.c
dm-exception-store.h
dm-flakey.c block: rework zone reporting 2019-11-12 19:12:07 -07:00
dm-historical-service-time.c dm mpath: add Historical Service Time Path Selector 2020-05-15 10:29:36 -04:00
dm-init.c dm init: Set file local variable static 2020-08-04 15:51:28 -04:00
dm-integrity.c dm integrity: fix error reporting in bitmap mode after creation 2020-09-01 16:41:57 -04:00
dm-io.c treewide: Remove uninitialized_var() usage 2020-07-16 12:35:15 -07:00
dm-ioctl.c - DM multipath locking fixes around m->flags tests and improvements to 2020-08-07 13:08:09 -07:00
dm-kcopyd.c
dm-linear.c dm,dax: Add dax zero_page_range operation 2020-04-02 19:15:03 -07:00
dm-log-userspace-base.c
dm-log-userspace-transfer.c
dm-log-userspace-transfer.h
dm-log-writes.c dm: replace zero-length array with flexible-array 2020-05-20 17:09:44 -04:00
dm-log.c
dm-mpath.c dm mpath: fix racey management of PG initialization 2020-09-01 16:41:56 -04:00
dm-mpath.h
dm-path-selector.c
dm-path-selector.h dm mpath: pass IO start time to path selector 2020-05-15 10:29:36 -04:00
dm-queue-length.c dm mpath: pass IO start time to path selector 2020-05-15 10:29:36 -04:00
dm-raid.c block: add a new revalidate_disk_size helper 2020-09-02 08:00:07 -06:00
dm-raid1.c block: rename generic_make_request to submit_bio_noacct 2020-07-01 07:27:24 -06:00
dm-region-hash.c
dm-round-robin.c
dm-rq.c - DM multipath locking fixes around m->flags tests and improvements to 2020-08-07 13:08:09 -07:00
dm-rq.h
dm-service-time.c dm mpath: pass IO start time to path selector 2020-05-15 10:29:36 -04:00
dm-snap-persistent.c Remove uninitialized_var() macro for v5.9-rc1 2020-08-04 13:49:43 -07:00
dm-snap-transient.c
dm-snap.c block: rename generic_make_request to submit_bio_noacct 2020-07-01 07:27:24 -06:00
dm-stats.c dm: replace zero-length array with flexible-array 2020-05-20 17:09:44 -04:00
dm-stats.h
dm-stripe.c dm: replace zero-length array with flexible-array 2020-05-20 17:09:44 -04:00
dm-switch.c dm: replace zero-length array with flexible-array 2020-05-20 17:09:44 -04:00
dm-sysfs.c
dm-table.c Merge branch 'for-5.10/block' into for-5.10/drivers 2020-09-24 13:44:39 -06:00
dm-target.c
dm-thin-metadata.c dm thin metadata: Fix use-after-free in dm_bm_set_read_only 2020-09-02 13:38:40 -04:00
dm-thin-metadata.h dm thin metadata: Add support for a pre-commit callback 2019-12-05 17:05:24 -05:00
dm-thin.c writeback: remove bdi->congested_fn 2020-07-08 17:20:46 -06:00
dm-uevent.c
dm-uevent.h
dm-unstripe.c
dm-verity-fec.c dm verity fec: fix hash block number in verity_fec_decode 2020-04-16 16:16:38 -04:00
dm-verity-fec.h
dm-verity-target.c - DM multipath locking fixes around m->flags tests and improvements to 2020-08-07 13:08:09 -07:00
dm-verity-verify-sig.c
dm-verity-verify-sig.h dm verity: Fix compilation warning 2020-08-04 15:48:13 -04:00
dm-verity.h dm verity: add "panic_on_corruption" error handling mode 2020-07-13 11:47:33 -04:00
dm-writecache.c dm writecache: handle DAX to partitions on persistent memory correctly 2020-09-01 16:41:55 -04:00
dm-zero.c
dm-zoned-metadata.c dm zoned: Fix zone reclaim trigger 2020-07-08 12:21:53 -04:00
dm-zoned-reclaim.c dm zoned: Fix zone reclaim trigger 2020-07-08 12:21:53 -04:00
dm-zoned-target.c for-5.9/block-20200802 2020-08-03 11:57:03 -07:00
dm-zoned.h dm zoned: select reclaim zone based on device index 2020-06-05 14:59:53 -04:00
dm.c Merge branch 'for-5.10/block' into for-5.10/drivers 2020-09-24 13:44:39 -06:00
dm.h writeback: remove bdi->congested_fn 2020-07-08 17:20:46 -06:00
Kconfig Replace HTTP links with HTTPS ones: LVM 2020-07-05 14:28:27 -06:00
Makefile md: move the early init autodetect code to drivers/md/ 2020-07-16 15:34:47 +02:00
md-autodetect.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
md-bitmap.c md: only calculate blocksize once and use i_blocksize() 2020-09-24 16:44:44 -07:00
md-bitmap.h
md-cluster.c block: add a new revalidate_disk_size helper 2020-09-02 08:00:07 -06:00
md-cluster.h
md-faulty.c block: rename generic_make_request to submit_bio_noacct 2020-07-01 07:27:24 -06:00
md-linear.c block: add a new revalidate_disk_size helper 2020-09-02 08:00:07 -06:00
md-linear.h md/raid1: Replace zero-length array with flexible-array 2020-05-13 12:02:23 -07:00
md-multipath.c writeback: remove bdi->congested_fn 2020-07-08 17:20:46 -06:00
md-multipath.h
md.c md: add md_submit_discard_bio() for submitting discard bio 2020-09-24 16:44:45 -07:00
md.h md: add md_submit_discard_bio() for submitting discard bio 2020-09-24 16:44:45 -07:00
raid0.c md: add md_submit_discard_bio() for submitting discard bio 2020-09-24 16:44:45 -07:00
raid0.h
raid1-10.c
raid1.c writeback: remove bdi->congested_fn 2020-07-08 17:20:46 -06:00
raid1.h md/raid1: Replace zero-length array with flexible-array 2020-05-13 12:02:23 -07:00
raid5-cache.c raid5-cache: hold spinlock instead of mutex in r5c_journal_mode_show 2020-08-02 23:03:52 -07:00
raid5-log.h
raid5-ppl.c md/raid456: convert macro STRIPE_* to RAID5_STRIPE_* 2020-07-21 17:18:12 -07:00
raid5.c md/raid5: reallocate page array after setting new stripe_size 2020-09-24 16:44:45 -07:00
raid5.h md/raid5: let multiple devices of stripe_head share page 2020-09-24 16:44:44 -07:00
raid10.c md/raid10: improve raid10 discard request 2020-09-24 16:44:45 -07:00
raid10.h md/raid1: Replace zero-length array with flexible-array 2020-05-13 12:02:23 -07:00