Jens Axboe 113285b473 blk-mq: ensure that bd->last is always set correctly ... When drivers are called with a request in blk-mq, blk-mq flags the state such that the driver knows if this is the last request in this call chain or not. The driver can then use that information to defer kicking off IO until bd->last is true. However, with blk-mq and scheduling, we need to allocate a driver tag for a request before it can be issued. If we fail to allocate such a tag, we could end up in the situation where the last request issued did not have bd->last == true set. This can then cause a driver hang. This fixes a hang with virtio-blk, which uses bd->last as a hint on whether to kick the queue or not. Reported-by: Chris Mason <clm@fb.com> Tested-by: Chris Mason <clm@fb.com> Reviewed-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Jens Axboe <axboe@fb.com>		2017-03-02 14:30:51 -07:00
..
partitions	partitions/efi: Fix integer overflow in GPT size calculation	2017-01-17 09:02:31 -07:00
badblocks.c	badblocks: badblocks_set/clear update unacked_exist	2016-10-21 15:45:47 -06:00
bio-integrity.c	block: remove bio_is_rw	2016-10-28 08:45:17 -06:00
bio.c	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md	2017-02-24 14:42:19 -08:00
blk-cgroup.c	blkcg: fix double free of new_blkg in blkcg_init_queue	2017-02-03 07:52:35 -07:00
blk-core.c	Merge branch 'for-4.11/next' into for-4.11/linus-merge	2017-02-17 14:08:19 -07:00
blk-exec.c	block: introduce blk_rq_is_passthrough	2017-01-31 14:00:34 -07:00
blk-flush.c	block: don't defer flushes on blk-mq + scheduling	2017-02-17 12:35:47 -07:00
blk-integrity.c	block: Use pointer to backing_dev_info from request_queue	2017-02-02 08:20:48 -07:00
blk-ioc.c	block: don't call ioc_exit_icq() with the queue lock held for blk-mq	2017-03-02 13:59:08 -07:00
blk-lib.c	block: don't try Write Same from __blkdev_issue_zeroout	2017-02-06 09:34:46 -07:00
blk-map.c	block: fold cmd_type into the REQ_OP_ space	2017-01-31 14:00:44 -07:00
blk-merge.c	block: optionally merge discontiguous discard bios into a single request	2017-02-08 13:43:08 -07:00
blk-mq-cpumap.c	blk-mq: export blk_mq_map_queues	2016-11-08 17:30:00 -05:00
blk-mq-debugfs.c	block: use same block debugfs directory for blk-mq and blktrace	2017-02-02 10:20:16 -07:00
blk-mq-pci.c	blk_mq: linux/blk-mq.h does not include all the headers it depends on	2016-09-19 08:21:51 -06:00
blk-mq-sched.c	blk-mq: move update of tags->rqs to __blk_mq_alloc_request()	2017-03-02 08:56:04 -07:00
blk-mq-sched.h	blk-mq-sched: separate mark hctx and queue restart operations	2017-02-23 11:55:47 -07:00
blk-mq-sysfs.c	blk-mq: move debugfs_remove() of disk dir to blk_release_queue()	2017-02-02 10:20:16 -07:00
blk-mq-tag.c	blk-mq-sched: Allocate sched reserved tags as specified in the original queue tagset	2017-03-02 08:56:04 -07:00
blk-mq-tag.h	blk-mq-sched: Allocate sched reserved tags as specified in the original queue tagset	2017-03-02 08:56:04 -07:00
blk-mq.c	blk-mq: ensure that bd->last is always set correctly	2017-03-02 14:30:51 -07:00
blk-mq.h	blk-mq: kill blk_mq_set_alloc_data()	2017-03-02 08:56:04 -07:00
blk-settings.c	block: optionally merge discontiguous discard bios into a single request	2017-02-08 13:43:08 -07:00
blk-softirq.c	This adds a new gcc plugin named "latent_entropy". It is designed to	2016-10-15 10:03:15 -07:00
blk-stat.c	blk-stat: fix a few cases of missing batch flushing	2016-12-09 13:08:35 -07:00
blk-stat.h	block: add scalable completion tracking of requests	2016-11-10 13:53:26 -07:00
blk-sysfs.c	block: don't call ioc_exit_icq() with the queue lock held for blk-mq	2017-03-02 13:59:08 -07:00
blk-tag.c	blk-mq-sched: add framework for MQ capable IO schedulers	2017-01-17 10:04:20 -07:00
blk-throttle.c	scripts/spelling.txt: add "embeded" pattern and fix typo instances	2017-02-27 18:43:47 -08:00
blk-timeout.c	block: remove REQ_NO_TIMEOUT flag	2015-12-22 09:38:34 -07:00
blk-wbt.c	block: Use pointer to backing_dev_info from request_queue	2017-02-02 08:20:48 -07:00
blk-wbt.h	blk-wbt: allow wbt to be enabled always through sysfs	2016-11-28 10:27:03 -07:00
blk-zoned.c	block: Rename blk_queue_zone_size and bdev_zone_size	2017-01-12 07:58:32 -07:00
blk.h	block: optionally merge discontiguous discard bios into a single request	2017-02-08 13:43:08 -07:00
bounce.c	Merge branch 'for-linus' of git://git.kernel.dk/linux-block	2015-09-19 18:57:09 -07:00
bsg-lib.c	block: split scsi_request out of struct request	2017-01-27 15:08:35 -07:00
bsg.c	lib/vsprintf.c: remove %Z support	2017-02-27 18:43:47 -08:00
cfq-iosched.c	for-4.11/linus-merge-signed	2017-02-21 10:57:33 -08:00
cmdline-parser.c	block: remove unrelated header files and export symbol	2014-01-21 20:18:26 -08:00
compat_ioctl.c	block: Get rid of blk_get_backing_dev_info()	2017-02-02 08:21:32 -07:00
deadline-iosched.c	block: enumify ELEVATOR_*_MERGE	2017-02-08 13:43:06 -07:00
elevator.c	block: don't call ioc_exit_icq() with the queue lock held for blk-mq	2017-03-02 13:59:08 -07:00
genhd.c	block: Unhash also block device inode for the whole device	2017-02-21 12:51:54 -07:00
ioctl.c	block: Get rid of blk_get_backing_dev_info()	2017-02-02 08:21:32 -07:00
ioprio.c	block: use for_each_thread() in sys_ioprio_set()/sys_ioprio_get()	2017-02-22 16:41:27 -08:00
Kconfig	Merge branch 'for-4.11/next' into for-4.11/linus-merge	2017-02-17 14:08:19 -07:00
Kconfig.iosched	block: get rid of blk-mq default scheduler choice Kconfig entries	2017-02-22 13:19:45 -07:00
Makefile	Merge branch 'for-4.11/next' into for-4.11/linus-merge	2017-02-17 14:08:19 -07:00
mq-deadline.c	block: enumify ELEVATOR_*_MERGE	2017-02-08 13:43:06 -07:00
noop-iosched.c	block: move existing elevator ops to union	2017-01-17 10:03:33 -07:00
opal_proto.h	block/sed-opal: allocate struct opal_dev dynamically	2017-02-17 12:41:47 -07:00
partition-generic.c	block: Rename blk_queue_zone_size and bdev_zone_size	2017-01-12 07:58:32 -07:00
scsi_ioctl.c	block: fold cmd_type into the REQ_OP_ space	2017-01-31 14:00:44 -07:00
sed-opal.c	block/sed-opal: Propagate original error message to userland.	2017-02-23 11:55:44 -07:00
t10-pi.c	block: Consolidate static integrity profile properties	2015-10-21 14:42:38 -06:00