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Martin Wilck 49306a3e9d dm mpath: switch paths in dm_blk_ioctl() code path 
[ Upstream commit 2361ae5953 ]

SCSI LUN passthrough code such as qemu's "scsi-block" device model
pass every IO to the host via SG_IO ioctls. Currently, dm-multipath
calls choose_pgpath() only in the block IO code path, not in the ioctl
code path (unless current_pgpath is NULL). This has the effect that no
path switching and thus no load balancing is done for SCSI-passthrough
IO, unless the active path fails.

Fix this by using the same logic in multipath_prepare_ioctl() as in
multipath_clone_and_map().

Note: The allegedly best path selection algorithm, service-time,
still wouldn't work perfectly, because the io size of the current
request is always set to 0. Changing that for the IO passthrough
case would require the ioctl cmd and arg to be passed to dm's
prepare_ioctl() method.

Signed-off-by: Martin Wilck <mwilck@suse.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-06-25 15:32:49 +02:00
..
bcache bcache: fix refcount underflow in bcache_device_free() 2020-06-22 09:05:19 +02:00
persistent-data dm space map common: fix to ensure new block isn't already in use 2020-02-11 04:34:03 -08:00
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 bio record: save/restore bi_end_io and bi_integrity 2020-03-25 08:06:07 +01:00
dm-bufio.c Revert "dm bufio: fix deadlock with loop device" 2019-08-29 08:28:49 +02:00
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: Fix loading discard bitset 2019-05-25 18:23:38 +02:00
dm-cache-metadata.h
dm-cache-policy-internal.h
dm-cache-policy-smq.c treewide: Use array_size() in vzalloc() 2018-06-12 16:19:22 -07:00
dm-cache-policy.c
dm-cache-policy.h
dm-cache-target.c dm cache: fix a crash due to incorrect work item cancelling 2020-03-11 14:15:05 +01:00
dm-core.h dm: disable DISCARD if the underlying storage no longer supports it 2019-08-25 10:48:01 +02:00
dm-crypt.c dm crypt: avoid truncating the logical block size 2020-06-22 09:05:28 +02:00
dm-delay.c dm delay: fix a crash when invalid device is specified 2019-05-25 18:23:39 +02:00
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 dm flakey: Properly corrupt multi-page bios. 2019-12-05 09:20:36 +01:00
dm-integrity.c dm integrity: use dm_bio_record and dm_bio_restore 2020-03-25 08:06:07 +01:00
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 2018-11-13 11:08:49 -08:00
dm-kcopyd.c dm kcopyd: always complete failed jobs 2019-08-29 08:28:55 +02:00
dm-linear.c dm: Check for device sector overflow if CONFIG_LBDAF is not set 2019-01-26 09:32:42 +01:00
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 dm log writes: make sure super sector log updates are written in order 2019-07-03 13:14:45 +02:00
dm-log.c
dm-mpath.c dm mpath: switch paths in dm_blk_ioctl() code path 2020-06-25 15:32:49 +02:00
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-raid.c dm raid: fix false -EBUSY when handling check/repair message 2019-12-05 09:20:37 +01:00
dm-raid1.c dm: Check for device sector overflow if CONFIG_LBDAF is not set 2019-01-26 09:32:42 +01:00
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 blk-mq: add callback of .cleanup_rq 2019-10-05 13:10:03 +02:00
dm-rq.h
dm-service-time.c dm mpath selector: more evenly distribute ties 2018-01-29 13:44:58 -05:00
dm-snap-persistent.c block: fix an integer overflow in logical block size 2020-01-23 08:21:29 +01:00
dm-snap-transient.c
dm-snap.c dm snapshot: rework COW throttling to fix deadlock 2019-11-06 13:05:11 +01:00
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-table.c dm table: fix invalid memory accesses with too high sector number 2019-08-29 08:28:56 +02:00
dm-target.c dm mpath: fix missing call of path selector type->end_io 2019-09-16 08:22:12 +02:00
dm-thin-metadata.c dm thin metadata: check if in fail_io mode when setting needs_check 2019-09-16 08:22:21 +02:00
dm-thin-metadata.h dm thin: fix passdown_double_checking_shared_status() 2019-01-31 08:14:38 +01:00
dm-thin.c dm thin: add sanity checks to thin-pool and external snapshot creation 2019-04-05 22:32:59 +02:00
dm-uevent.c
dm-uevent.h
dm-unstripe.c dm: Check for device sector overflow if CONFIG_LBDAF is not set 2019-01-26 09:32:42 +01:00
dm-verity-fec.c dm verity fec: fix hash block number in verity_fec_decode 2020-05-06 08:13:28 +02:00
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: use message limit for data block corruption message 2019-07-21 09:03:08 +02:00
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: fix data corruption when reloading the target 2020-05-06 08:13:28 +02:00
dm-zero.c
dm-zoned-metadata.c dm zoned: remove duplicate nr_rnd_zones increase in dmz_init_zone() 2020-04-17 10:48:54 +02:00
dm-zoned-reclaim.c dm zoned: reduce overhead of backing device checks 2019-12-17 20:34:53 +01:00
dm-zoned-target.c dm zoned: reduce overhead of backing device checks 2019-12-17 20:34:53 +01:00
dm-zoned.h dm zoned: reduce overhead of backing device checks 2019-12-17 20:34:53 +01:00
dm.c dm: report suspended device during destroy 2020-03-11 14:15:05 +01:00
dm.h dm: move dm_table_destroy() to same header as dm_table_create() 2018-01-17 09:16:06 -05:00
Kconfig dm: add writecache target 2018-06-08 11:59:51 -04:00
Makefile dm: add writecache target 2018-06-08 11:59:51 -04:00
md-bitmap.c md/bitmap: avoid race window between md_bitmap_resize and bitmap_file_clear_bit 2019-12-31 16:35:25 +01:00
md-bitmap.h md: Avoid namespace collision with bitmap API 2018-08-01 15:49:39 -07:00
md-cluster.c md-cluster: release RESYNC lock after the last resync message 2018-08-31 17:38:10 -07:00
md-cluster.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
md-faulty.c md: convert to bioset_init()/mempool_init() 2018-05-30 15:33:32 -06:00
md-linear.c md: improve handling of bio with REQ_PREFLUSH in md_flush_request() 2019-12-17 20:34:55 +01:00
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 md: improve handling of bio with REQ_PREFLUSH in md_flush_request() 2019-12-17 20:34:55 +01:00
md-multipath.h md: convert to bioset_init()/mempool_init() 2018-05-30 15:33:32 -06:00
md.c md: don't flush workqueue unconditionally in md_open 2020-06-22 09:05:17 +02:00
md.h md: improve handling of bio with REQ_PREFLUSH in md_flush_request() 2019-12-17 20:34:55 +01:00
raid0.c block: fix an integer overflow in logical block size 2020-01-23 08:21:29 +01:00
raid0.h md/raid0: avoid RAID0 data corruption due to layout confusion. 2019-10-05 13:10:12 +02:00
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: raid1: check rdev before reference in raid1_sync_request func 2020-01-09 10:18:57 +01:00
raid1.h md: convert to bioset_init()/mempool_init() 2018-05-30 15:33:32 -06:00
raid5-cache.c md/raid5: fix 'out of memory' during raid cache recovery 2019-02-06 17:30:16 +01:00
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: need to set STRIPE_HANDLE for batch head 2019-12-17 20:36:00 +01:00
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: improve handling of bio with REQ_PREFLUSH in md_flush_request() 2019-12-17 20:34:55 +01:00
raid10.h md: convert to bioset_init()/mempool_init() 2018-05-30 15:33:32 -06:00