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Ming Lei 86ff7c2a80 blk-mq: introduce BLK_STS_DEV_RESOURCE 
This status is returned from driver to block layer if device related
resource is unavailable, but driver can guarantee that IO dispatch
will be triggered in future when the resource is available.

Convert some drivers to return BLK_STS_DEV_RESOURCE.  Also, if driver
returns BLK_STS_RESOURCE and SCHED_RESTART is set, rerun queue after
a delay (BLK_MQ_DELAY_QUEUE) to avoid IO stalls.  BLK_MQ_DELAY_QUEUE is
3 ms because both scsi-mq and nvmefc are using that magic value.

If a driver can make sure there is in-flight IO, it is safe to return
BLK_STS_DEV_RESOURCE because:

1) If all in-flight IOs complete before examining SCHED_RESTART in
blk_mq_dispatch_rq_list(), SCHED_RESTART must be cleared, so queue
is run immediately in this case by blk_mq_dispatch_rq_list();

2) if there is any in-flight IO after/when examining SCHED_RESTART
in blk_mq_dispatch_rq_list():
- if SCHED_RESTART isn't set, queue is run immediately as handled in 1)
- otherwise, this request will be dispatched after any in-flight IO is
  completed via blk_mq_sched_restart()

3) if SCHED_RESTART is set concurently in context because of
BLK_STS_RESOURCE, blk_mq_delay_run_hw_queue() will cover the above two
cases and make sure IO hang can be avoided.

One invariant is that queue will be rerun if SCHED_RESTART is set.

Suggested-by: Jens Axboe <axboe@kernel.dk>
Tested-by: Laurence Oberman <loberman@redhat.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-01-30 20:18:28 -07:00
..
aacraid scsi: aacraid: Fix I/O drop during reset 2017-12-14 22:34:28 -05:00
aic7xxx SCSI misc on 20171114 2017-11-14 16:23:44 -08:00
aic94xx treewide: Remove TIMER_FUNC_TYPE and TIMER_DATA_TYPE casts 2017-11-21 16:35:54 -08:00
arcmsr treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
arm treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
be2iscsi treewide: Remove TIMER_FUNC_TYPE and TIMER_DATA_TYPE casts 2017-11-21 16:35:54 -08:00
bfa SCSI fixes on 20171215 2017-12-15 12:51:42 -08:00
bnx2fc Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-25 08:37:16 -10:00
bnx2i SCSI misc on 20171114 2017-11-14 16:23:44 -08:00
csiostor SCSI misc on 20171114 2017-11-14 16:23:44 -08:00
cxgbi treewide: Remove TIMER_FUNC_TYPE and TIMER_DATA_TYPE casts 2017-11-21 16:35:54 -08:00
cxlflash Merge branch 'misc.compat' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-11-17 11:54:55 -08:00
device_handler scsi: scsi_dh: Return SCSI_DH_XX error code from ->attach() 2017-09-25 19:03:14 -04:00
dpt sched/wait: Rename wait_queue_t => wait_queue_entry_t 2017-06-20 12:18:27 +02:00
esas2r treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
fcoe treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
fnic treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
hisi_sas treewide: Remove TIMER_FUNC_TYPE and TIMER_DATA_TYPE casts 2017-11-21 16:35:54 -08:00
ibmvscsi scsi: ibmvscsi: Convert timers to use timer_setup() 2017-11-01 11:27:06 -07:00
ibmvscsi_tgt License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
isci Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
libfc SCSI fixes on 20171215 2017-12-15 12:51:42 -08:00
libsas SCSI fixes on 20180119 2018-01-19 15:20:00 -08:00
lpfc scsi: lpfc: Use after free in lpfc_rq_buf_free() 2017-11-28 23:46:06 -05:00
megaraid SCSI misc on 20171114 2017-11-14 16:23:44 -08:00
mpt3sas Modules updates for v4.15 2017-11-15 13:46:33 -08:00
mvsas treewide: Remove TIMER_FUNC_TYPE and TIMER_DATA_TYPE casts 2017-11-21 16:35:54 -08:00
osd block: fix blk_rq_append_bio 2017-12-18 13:55:43 -07:00
pcmcia License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pm8001 treewide: Remove TIMER_FUNC_TYPE and TIMER_DATA_TYPE casts 2017-11-21 16:35:54 -08:00
qedf Merge branch 'fixes' into misc 2017-09-07 12:12:43 -07:00
qedi Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2017-11-15 11:56:19 -08:00
qla2xxx SCSI misc on 20171114 2017-11-14 16:23:44 -08:00
qla4xxx scsi: qla4xxx: Convert timers to use timer_setup() 2017-11-01 11:44:40 -07:00
smartpqi SCSI misc on 20171114 2017-11-14 16:23:44 -08:00
snic License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sym53c8xx_2 treewide: setup_timer() -> timer_setup() (2 field) 2017-11-21 15:57:09 -08:00
ufs scsi: ufs: ufshcd: fix potential NULL pointer dereference in ufshcd_config_vreg 2017-11-21 23:00:44 -05:00
.gitignore scsi: scsi_devinfo: Add scsi_devinfo_tbl.c 2017-10-25 05:40:22 -04:00
3w-9xxx.c
3w-9xxx.h
3w-sas.c
3w-sas.h
3w-xxxx.c
3w-xxxx.h
53c700.c scsi: 53c700: move bus reset to host reset 2017-08-25 17:21:11 -04:00
53c700.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
53c700.scr
53c700_d.h_shipped
a100u2w.c
a100u2w.h
a2091.c scsi: drop bus reset for wd33c93-compatible boards 2017-08-25 17:21:10 -04:00
a2091.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
a3000.c scsi: drop bus reset for wd33c93-compatible boards 2017-08-25 17:21:10 -04:00
a3000.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
a4000t.c
advansys.c scsi: advansys: fix uninitialized data access 2017-04-04 19:39:39 -04:00
aha152x.c scsi: aha152x: drop host reset 2017-08-25 17:21:11 -04:00
aha152x.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
aha1542.c scsi: aha1542: constify pnp_device_id 2017-08-24 22:29:07 -04:00
aha1542.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
aha1740.c
aha1740.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
am53c974.c
atari_scsi.c scsi: NCR5380: Move bus reset to host reset 2017-08-25 17:21:11 -04:00
atp870u.c
atp870u.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
BusLogic.c scsi: BusLogic: fix incorrect spelling of adatper_reset_req 2017-04-21 10:31:33 -04:00
BusLogic.h scsi: BusLogic: fix incorrect spelling of adatper_reset_req 2017-04-21 10:31:33 -04:00
bvme6000_scsi.c
ch.c scsi: ch: add refcounting 2017-08-24 22:29:06 -04:00
constants.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
dc395x.c scsi: dc395x: Convert timers to use timer_setup() 2017-10-27 02:22:00 -07:00
dc395x.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
dmx3191d.c scsi: NCR5380: Move bus reset to host reset 2017-08-25 17:21:11 -04:00
dpt_i2o.c scsi: dpt_i2o: remove redundant null check on array device 2017-08-10 19:55:35 -04:00
dpti.h
eata.c scsi: eata: remove 'arg_done' from eata2x_eh_host_reset() 2017-08-25 17:21:12 -04:00
eata_generic.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
eata_pio.c
eata_pio.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
esp_scsi.c scsi: esp_scsi: Always clear msg_out_len after MESSAGE OUT phase 2017-08-10 19:55:35 -04:00
esp_scsi.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
fdomain.c scsi: fdomain: move bus reset to host reset 2017-08-25 17:21:10 -04:00
fdomain.h scsi: fdomain: move bus reset to host reset 2017-08-25 17:21:10 -04:00
FlashPoint.c
g_NCR5380.c scsi: NCR5380: Move bus reset to host reset 2017-08-25 17:21:11 -04:00
gdth.c scsi: gdth: Convert timers to use timer_setup() 2017-10-27 02:22:00 -07:00
gdth.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
gdth_ioctl.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
gdth_proc.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
gdth_proc.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
gvp11.c scsi: drop bus reset for wd33c93-compatible boards 2017-08-25 17:21:10 -04:00
gvp11.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hosts.c scsi: Remove Scsi_Host.uspace_req_q 2017-09-05 08:18:42 -04:00
hpsa.c SCSI misc on 20171114 2017-11-14 16:23:44 -08:00
hpsa.h scsi: hpsa: add support for legacy boards 2017-08-24 22:28:55 -04:00
hpsa_cmd.h scsi: hpsa: update discovery polling 2017-10-25 04:55:18 -04:00
hptiop.c scsi: hptiop: Simplify reset handling 2017-08-25 17:21:10 -04:00
hptiop.h
imm.c scsi: imm: drop duplicate bus_reset handler 2017-08-25 17:21:11 -04:00
imm.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
initio.c
initio.h
ipr.c treewide: Remove TIMER_FUNC_TYPE and TIMER_DATA_TYPE casts 2017-11-21 16:35:54 -08:00
ipr.h scsi: ipr: Fix scsi-mq lockdep issue 2017-08-08 11:49:51 -04:00
ips.c sched/wait: Rename wait_queue_t => wait_queue_entry_t 2017-06-20 12:18:27 +02:00
ips.h sched/wait: Rename wait_queue_t => wait_queue_entry_t 2017-06-20 12:18:27 +02:00
iscsi_boot_sysfs.c
iscsi_tcp.c scsi: iscsi_tcp: Remove a set-but-not-used variable 2017-08-25 17:08:08 -04:00
iscsi_tcp.h
jazz_esp.c
Kconfig Merge branch 'for-linus' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2017-11-15 10:14:11 -08:00
lasi700.c parisc/scsi/lasi700: Fix section mismatches 2017-08-22 16:34:36 +02:00
libiscsi.c Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
libiscsi_tcp.c
mac53c94.c scsi: Convert to using %pOF instead of full_name 2017-08-07 14:04:02 -04:00
mac53c94.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mac_esp.c scsi: mac_esp: Fix PIO transfers for MESSAGE IN phase 2017-08-10 19:55:34 -04:00
mac_scsi.c scsi: NCR5380: Move bus reset to host reset 2017-08-25 17:21:11 -04:00
Makefile SCSI misc on 20171114 2017-11-14 16:23:44 -08:00
megaraid.c scsi: megaraid: fix format-overflow warning 2017-08-07 14:04:01 -04:00
megaraid.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mesh.c
mesh.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mvme16x_scsi.c
mvme147.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mvme147.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mvumi.c scsi: mvumi: remove code handling zero scsi_sg_count(scmd) case 2017-04-24 18:16:49 -04:00
mvumi.h
ncr53c8xx.c treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
ncr53c8xx.h
NCR53c406a.c
NCR5380.c SCSI misc on 20171114 2017-11-14 16:23:44 -08:00
NCR5380.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
NCR_D700.c
NCR_D700.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
NCR_Q720.c dma-coherent: remove the DMA_MEMORY_MAP and DMA_MEMORY_IO flags 2017-09-01 11:59:17 +02:00
NCR_Q720.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
nsp32.c scsi: nsp32: fix logic bug in error handling 2017-10-16 22:38:44 -04:00
nsp32.h
nsp32_debug.c
nsp32_io.h
osst.c scsi: osst: silence underflow warning in osst_verify_frame() 2017-08-24 22:29:01 -04:00
osst.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
osst_detect.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
osst_options.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pmcraid.c treewide: Remove TIMER_FUNC_TYPE and TIMER_DATA_TYPE casts 2017-11-21 16:35:54 -08:00
pmcraid.h scsi: pmcraid: Replace PCI pool old API 2017-08-07 14:04:01 -04:00
ppa.c scsi: ppa: drop duplicate bus_reset handler 2017-08-25 17:21:11 -04:00
ppa.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ps3rom.c
qla1280.c timer: Remove init_timer_on_stack() in favor of timer_setup_on_stack() 2017-10-05 15:01:17 +02:00
qla1280.h timer: Remove init_timer_on_stack() in favor of timer_setup_on_stack() 2017-10-05 15:01:17 +02:00
qlogicfas.c scsi: qlogicfas: move bus_reset to host_reset 2017-08-25 17:21:11 -04:00
qlogicfas408.c scsi: qlogicfas: move bus_reset to host_reset 2017-08-25 17:21:11 -04:00
qlogicfas408.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
qlogicpti.c scsi: qlogicpti: fixup qlogicpti_reset() definition 2017-08-28 22:15:46 -04:00
qlogicpti.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
raid_class.c
script_asm.pl
scsi.c Merge branch 'fixes' into misc 2017-09-07 12:12:43 -07:00
scsi.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
scsi_common.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
scsi_debug.c scsi: scsi_debug: write_same: fix error report 2017-10-31 12:28:05 -04:00
scsi_debugfs.c scsi: core: Fix a scsi_show_rq() NULL pointer dereference 2017-12-11 21:56:48 -05:00
scsi_debugfs.h scsi: Implement blk_mq_ops.show_rq() 2017-04-26 15:09:04 -06:00
scsi_devinfo.c scsi: core: Use blist_flags_t consistently 2017-12-14 22:30:24 -05:00
scsi_dh.c scsi: scsi_dh: suppress errors from unsupported devices 2017-09-25 19:03:22 -04:00
scsi_error.c SCSI misc on 20171114 2017-11-14 16:23:44 -08:00
scsi_ioctl.c scsi: Suppress gcc 7 fall-through warnings reported with W=1 2017-08-25 17:08:07 -04:00
scsi_lib.c blk-mq: introduce BLK_STS_DEV_RESOURCE 2018-01-30 20:18:28 -07:00
scsi_lib_dma.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
scsi_logging.c
scsi_logging.h SCSI misc on 20171114 2017-11-14 16:23:44 -08:00
scsi_module.c
scsi_netlink.c netlink: extended ACK reporting 2017-04-13 13:58:20 -04:00
scsi_pm.c
scsi_priv.h scsi: Use 'blist_flags_t' for scsi_devinfo flags 2017-11-16 17:43:27 -05:00
scsi_proc.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
scsi_sas_internal.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
scsi_scan.c scsi: core: Use blist_flags_t consistently 2017-12-14 22:30:24 -05:00
scsi_sysctl.c
scsi_sysfs.c scsi: core: check for device state in __scsi_remove_target() 2017-12-18 22:34:18 -05:00
scsi_trace.c
scsi_transport_api.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
scsi_transport_fc.c SCSI misc on 20171114 2017-11-14 16:23:44 -08:00
scsi_transport_iscsi.c SCSI misc on 20171114 2017-11-14 16:23:44 -08:00
scsi_transport_sas.c scsi: scsi_transport_sas: check reply payload length instead of bidi request 2017-10-16 23:40:51 -04:00
scsi_transport_spi.c block, scsi: Fix race between SPI domain validation and system suspend 2018-01-10 01:10:20 +01:00
scsi_transport_srp.c Revert "scsi: make 'state' device attribute pollable" 2017-11-07 09:04:32 -08:00
scsi_typedefs.h
scsicam.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sd.c scsi: core: Fix a scsi_show_rq() NULL pointer dereference 2017-12-11 21:56:48 -05:00
sd.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sd_dif.c
sd_zbc.c scsi: sd_zbc: Fix sd_zbc_read_zoned_characteristics() 2017-10-16 23:54:33 -04:00
sense_codes.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ses.c Merge branch 'fixes' into misc 2017-09-07 12:12:43 -07:00
sg.c Merge branch 'for-4.15/block' of git://git.kernel.dk/linux-block 2017-11-14 15:32:19 -08:00
sgiwd93.c scsi: drop bus reset for wd33c93-compatible boards 2017-08-25 17:21:10 -04:00
sim710.c
sni_53c710.c
sr.c scsi: sd: sr: Convert two assignments into warning statements 2017-08-25 17:08:08 -04:00
sr.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sr_ioctl.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sr_vendor.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
st.c st: use get_user_pages_fast() 2017-09-22 23:14:28 -04:00
st.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
st_options.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
stex.c scsi: stex: make S6flag static 2017-04-26 18:32:29 -04:00
storvsc_drv.c scsi: storvsc: Fix scsi_cmd error assignments in storvsc_handle_error 2017-12-20 21:23:11 -05:00
sun3_scsi.c scsi: NCR5380: Move bus reset to host reset 2017-08-25 17:21:11 -04:00
sun3_scsi_vme.c
sun3x_esp.c
sun_esp.c scsi: sun_esp: fix device reference leaks 2017-06-27 21:46:55 -04:00
sym53c416.c
sym53c416.h
virtio_scsi.c scsi: virtio: virtio_scsi: Set can_queue to the length of the virtqueue. 2017-08-24 22:28:51 -04:00
vmw_pvscsi.c
vmw_pvscsi.h
wd33c93.c scsi: drop bus reset for wd33c93-compatible boards 2017-08-25 17:21:10 -04:00
wd33c93.h
wd719x.c
wd719x.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xen-scsifront.c scsi: xen-scsifront: Remove code that zeroes driver-private command data 2017-06-12 21:02:04 -04:00
zalon.c parisc/scsi/zalon: Fix section mismatches 2017-08-22 16:34:36 +02:00
zorro7xx.c