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Christoph Hellwig eded341c08 block: don't decrement nr_phys_segments for physically contigous segments 
Currently ll_merge_requests_fn, unlike all other merge functions,
reduces nr_phys_segments by one if the last segment of the previous,
and the first segment of the next segement are contigous.  While this
seems like a nice solution to avoid building smaller than possible
requests it causes a mismatch between the segments actually present
in the request and those iterated over by the bvec iterators, including
__rq_for_each_bio.  This can for example mistrigger the single segment
optimization in the nvme-pci driver, and might lead to mismatching
nr_phys_segments number when recalculating the number of request
when inserting a cloned request.

We could possibly work around this by making the bvec iterators take
the front and back segment size into account, but that would require
moving them from the bio to the bio_iter and spreading this mess
over all users of bvecs.  Or we could simply remove this optimization
under the assumption that most users already build good enough bvecs,
and that the bio merge patch never cared about this optimization
either.  The latter is what this patch does.

dff824b2aa ("nvme-pci: optimize mapping of small single segment requests").
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 		2019-05-23 10:25:26 -06:00
..
partitions block: add SPDX tags to block layer files missing licensing information 2019-04-30 16:12:03 -06:00
Kconfig block: remove CONFIG_LBDAF 2019-04-06 10:48:35 -06:00
Kconfig.iosched block: remove legacy IO schedulers 2018-11-07 13:42:32 -07:00
Makefile block: remove legacy IO schedulers 2018-11-07 13:42:32 -07:00
badblocks.c block: switch all files cleared marked as GPLv2 to SPDX tags 2019-04-30 16:11:57 -06:00
bfq-cgroup.c block: switch all files cleared marked as GPLv2 or later to SPDX tags 2019-04-30 16:11:59 -06:00
bfq-iosched.c block: switch all files cleared marked as GPLv2 or later to SPDX tags 2019-04-30 16:11:59 -06:00
bfq-iosched.h block: switch all files cleared marked as GPLv2 or later to SPDX tags 2019-04-30 16:11:59 -06:00
bfq-wf2q.c block: switch all files cleared marked as GPLv2 or later to SPDX tags 2019-04-30 16:11:59 -06:00
bio-integrity.c block/bio-integrity: use struct_size() in kmalloc() 2019-05-16 08:48:48 -06:00
bio.c block: switch all files cleared marked as GPLv2 to SPDX tags 2019-04-30 16:11:57 -06:00
blk-cgroup.c block: add SPDX tags to block layer files missing licensing information 2019-04-30 16:12:03 -06:00
blk-core.c block: don't drain in-progress dispatch in blk_cleanup_queue() 2019-05-04 07:24:11 -06:00
blk-exec.c block: add SPDX tags to block layer files missing licensing information 2019-04-30 16:12:03 -06:00
blk-flush.c block: switch all files cleared marked as GPLv2 to SPDX tags 2019-04-30 16:11:57 -06:00
blk-integrity.c for-5.2/block-20190507 2019-05-07 18:14:36 -07:00
blk-ioc.c block: remove the queue_lock indirection 2018-11-15 12:17:28 -07:00
blk-iolatency.c block: add SPDX tags to block layer files missing licensing information 2019-04-30 16:12:03 -06:00
blk-lib.c block: fix 32 bit overflow in __blkdev_issue_discard() 2018-11-14 08:17:18 -07:00
blk-map.c
…
blk-merge.c block: don't decrement nr_phys_segments for physically contigous segments 2019-05-23 10:25:26 -06:00
blk-mq-cpumap.c block: add SPDX tags to block layer files missing licensing information 2019-04-30 16:12:03 -06:00
blk-mq-debugfs-zoned.c block: Cleanup license notice 2019-01-17 21:21:40 -07:00
blk-mq-debugfs.c block: switch all files cleared marked as GPLv2 to SPDX tags 2019-04-30 16:11:57 -06:00
blk-mq-debugfs.h blk-mq-debugfs: support rq_qos 2018-12-16 19:53:47 -07:00
blk-mq-pci.c block: switch all files cleared marked as GPLv2 to SPDX tags 2019-04-30 16:11:57 -06:00
blk-mq-rdma.c block: switch all files cleared marked as GPLv2 to SPDX tags 2019-04-30 16:11:57 -06:00
blk-mq-sched.c blk-mq: grab .q_usage_counter when queuing request from plug code path 2019-05-04 07:24:02 -06:00
blk-mq-sched.h block: mq-deadline: Fix write completion handling 2018-12-17 11:19:39 -07:00
blk-mq-sysfs.c for-5.2/block-20190507 2019-05-07 18:14:36 -07:00
blk-mq-tag.c block: add SPDX tags to block layer files missing licensing information 2019-04-30 16:12:03 -06:00
blk-mq-tag.h
…
blk-mq-virtio.c block: switch all files cleared marked as GPLv2 to SPDX tags 2019-04-30 16:11:57 -06:00
blk-mq.c blk-mq: always free hctx after request queue is freed 2019-05-04 07:24:08 -06:00
blk-mq.h blk-mq: free hw queue's resource in hctx's release handler 2019-05-04 07:24:05 -06:00
blk-pm.c block: remove the queue_lock indirection 2018-11-15 12:17:28 -07:00
blk-pm.h block: remove the queue_lock indirection 2018-11-15 12:17:28 -07:00
blk-rq-qos.c block: add SPDX tags to block layer files missing licensing information 2019-04-30 16:12:03 -06:00
blk-rq-qos.h block: add SPDX tags to block layer files missing licensing information 2019-04-30 16:12:03 -06:00
blk-settings.c block: remove the unused blk_queue_dma_pad function 2019-04-30 16:12:36 -06:00
blk-softirq.c block: remove a few unused exports 2018-11-15 12:13:25 -07:00
blk-stat.c block: add SPDX tags to block layer files missing licensing information 2019-04-30 16:12:03 -06:00
blk-stat.h block: deactivate blk_stat timer in wbt_disable_default() 2018-12-12 06:47:51 -07:00
blk-sysfs.c block: Replace all ktype default_attrs with groups 2019-04-25 22:06:11 +02:00
blk-throttle.c blkcg: consolidate bio_issue_init() to be a part of core 2018-12-07 22:26:37 -07:00
blk-timeout.c block: add SPDX tags to block layer files missing licensing information 2019-04-30 16:12:03 -06:00
blk-wbt.c block: add SPDX tags to block layer files missing licensing information 2019-04-30 16:12:03 -06:00
blk-wbt.h
…
blk-zoned.c block: add SPDX tags to block layer files missing licensing information 2019-04-30 16:12:03 -06:00
blk.h block: pass page to xen_biovec_phys_mergeable 2019-04-01 12:11:13 -06:00
bounce.c block: remove the i argument to bio_for_each_segment_all 2019-04-30 09:26:13 -06:00
bsg-lib.c block: switch all files cleared marked as GPLv2 or later to SPDX tags 2019-04-30 16:11:59 -06:00
bsg.c block: switch all files cleared marked as GPLv2 to SPDX tags 2019-04-30 16:11:57 -06:00
cmdline-parser.c
…
compat_ioctl.c
…
elevator.c block: add SPDX tags to block layer files missing licensing information 2019-04-30 16:12:03 -06:00
genhd.c block: add SPDX tags to block layer files missing licensing information 2019-04-30 16:12:03 -06:00
ioctl.c block: add SPDX tags to block layer files missing licensing information 2019-04-30 16:12:03 -06:00
ioprio.c block: add SPDX tags to block layer files missing licensing information 2019-04-30 16:12:03 -06:00
kyber-iosched.c block: switch all files cleared marked as GPLv2 to SPDX tags 2019-04-30 16:11:57 -06:00
mq-deadline.c block: add SPDX tags to block layer files missing licensing information 2019-04-30 16:12:03 -06:00
opal_proto.h block: switch all files cleared marked as GPLv2 to SPDX tags 2019-04-30 16:11:57 -06:00
partition-generic.c block: fix use-after-free on gendisk 2019-04-22 09:48:12 -06:00
scsi_ioctl.c block: switch all files cleared marked as GPLv2 to SPDX tags 2019-04-30 16:11:57 -06:00
sed-opal.c block: switch all files cleared marked as GPLv2 to SPDX tags 2019-04-30 16:11:57 -06:00
t10-pi.c block: switch all files cleared marked as GPLv2 to SPDX tags 2019-04-30 16:11:57 -06:00