Yufen Yu 5de719e3d0 dm mpath: fix missing call of path selector type->end_io ... After commit 396eaf21ee ("blk-mq: improve DM's blk-mq IO merging via blk_insert_cloned_request feedback"), map_request() will requeue the tio when issued clone request return BLK_STS_RESOURCE or BLK_STS_DEV_RESOURCE. Thus, if device driver status is error, a tio may be requeued multiple times until the return value is not DM_MAPIO_REQUEUE. That means type->start_io may be called multiple times, while type->end_io is only called when IO complete. In fact, even without commit 396eaf21ee, setup_clone() failure can also cause tio requeue and associated missed call to type->end_io. The service-time path selector selects path based on in_flight_size, which is increased by st_start_io() and decreased by st_end_io(). Missed calls to st_end_io() can lead to in_flight_size count error and will cause the selector to make the wrong choice. In addition, queue-length path selector will also be affected. To fix the problem, call type->end_io in ->release_clone_rq before tio requeue. map_info is passed to ->release_clone_rq() for map_request() error path that result in requeue. Fixes: 396eaf21ee ("blk-mq: improve DM's blk-mq IO merging via blk_insert_cloned_request feedback") Cc: stable@vger.kernl.org Signed-off-by: Yufen Yu <yuyufen@huawei.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>		2019-04-25 15:38:52 -04:00
..
acpi	ACPI: use different default debug value than ACPICA	2019-03-25 10:45:59 +01:00
asm-generic	syscalls: Remove start and number from syscall_set_arguments() args	2019-04-05 09:27:23 -04:00
clocksource
crypto
drm	drm/atomic-helper: Make atomic_enable/disable crtc callbacks optional	2019-03-29 11:56:52 +01:00
dt-bindings	dt-bindings: reset: meson-g12a: Add missing USB2 PHY resets	2019-03-25 16:22:10 +01:00
keys	KEYS: trusted: fix -Wvarags warning	2019-04-08 15:58:54 -07:00
kvm	ARM: some cleanups, direct physical timer assignment, cache sanitization	2019-03-15 15:00:28 -07:00
linux	dm mpath: fix missing call of path selector type->end_io	2019-04-25 15:38:52 -04:00
math-emu
media	media: include: fix several typos	2019-03-01 09:45:52 -05:00
memory
misc	auxdisplay: charlcd: Introduce charlcd_free() helper	2019-03-17 08:48:16 +01:00
net	nfc: nci: Potential off by one in ->pipes[] array	2019-04-06 15:05:07 -07:00
pcmcia
ras
rdma
scsi
soc	IOMMU Updates for Linux v5.1	2019-03-10 12:29:52 -07:00
sound	ASoC: core: conditionally increase module refcount on component open	2019-04-08 14:15:44 +07:00
target
trace	syscalls: Remove start and number from syscall_get_arguments() args	2019-04-05 09:26:43 -04:00
uapi	sound fixes for 5.1-rc5	2019-04-12 08:11:59 -07:00
video	media updates for v5.1-rc1	2019-03-09 14:45:54 -08:00
xen