Christoph Hellwig 5f1b670d0b block, dm: don't copy bios for request clones ...

Currently dm-multipath has to clone the bios for every request sent
to the lower devices, which wastes cpu cycles and ties down memory.

This patch instead adds a new REQ_CLONE flag that instructs req_bio_endio
to not complete bios attached to a request, which we set on clone
requests similar to bios in a flush sequence.  With this change I/O
errors on a path failure only get propagated to dm-multipath, which
can then either resubmit the I/O or complete the bios on the original
request.

I've done some basic testing of this on a Linux target with ALUA support,
and it survives path failures during I/O nicely.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

2015-05-22 08:58:57 -06:00

..

bcache

block: remove management of bi_remaining when restoring original bi_end_io

2015-05-22 08:58:55 -06:00

persistent-data

Merge tag 'dm-3.20-changes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

2015-02-21 13:28:45 -08:00

bitmap.c

md-cluster: re-add capabilities

2015-04-22 07:59:39 +10:00

bitmap.h

md-cluster: re-add capabilities

2015-04-22 07:59:39 +10:00

dm-bio-prison.c

dm bio prison: introduce support for locking ranges of blocks

2014-11-10 15:25:30 -05:00

dm-bio-prison.h

dm bio prison: introduce support for locking ranges of blocks

2014-11-10 15:25:30 -05:00

dm-bio-record.h

dm: Refactor for new bio cloning/splitting

2013-11-23 22:33:55 -08:00

dm-bufio.c

dm bufio: fix time comparison to use time_after_eq()

2015-02-09 13:06:48 -05:00

dm-bufio.h

dm snapshot: use dm-bufio prefetch

2014-01-14 23:23:03 -05:00

dm-builtin.c

dm sysfs: fix a module unload race

2014-01-14 23:23:04 -05:00

dm-cache-block-types.h

dm cache: revert "remove remainder of distinct discard block size"

2014-11-10 15:25:30 -05:00

dm-cache-metadata.c

dm cache: fix missing ERR_PTR returns and handling

2015-01-28 09:59:20 -05:00

dm-cache-metadata.h

dm cache: revert "remove remainder of distinct discard block size"

2014-11-10 15:25:30 -05:00

dm-cache-policy-cleaner.c

dm cache: policy change version from string to integer set

2013-03-20 17:21:27 +00:00

dm-cache-policy-internal.h

dm cache: add remove_cblock method to policy interface

2013-11-11 11:37:50 -05:00

dm-cache-policy-mq.c

dm cache policy mq: try not to writeback data that changed in the last second

2015-03-31 12:03:48 -04:00

dm-cache-policy.c

dm cache: add policy name to status output

2014-01-16 13:44:11 -05:00

dm-cache-policy.h

dm cache: add policy name to status output

2014-01-16 13:44:11 -05:00

dm-cache-target.c

block: remove management of bi_remaining when restoring original bi_end_io

2015-05-22 08:58:55 -06:00

dm-crypt.c

dm crypt: fix missing error code return from crypt_ctr error path

2015-04-16 22:00:50 -04:00

dm-delay.c

dm delay: use msecs_to_jiffies for time conversion

2015-04-15 12:10:21 -04:00

dm-era-target.c

dm era: check for a non-NULL metadata object before closing it

2014-06-03 13:44:08 -04:00

dm-exception-store.c

dm: replace simple_strtoul

2012-07-27 15:07:59 +01:00

dm-exception-store.h

dm snapshot: test chunk size against both origin and snapshot

2010-08-12 04:13:51 +01:00

dm-flakey.c

block: Abstract out bvec iterator

2013-11-23 22:33:47 -08:00

dm-io.c

dm io: deal with wandering queue limits when handling REQ_DISCARD and REQ_WRITE_SAME

2015-02-27 14:53:32 -05:00

dm-ioctl.c

dm: only initialize the request_queue once

2015-04-30 10:25:21 -04:00

dm-kcopyd.c

dm: stop using WQ_NON_REENTRANT

2013-08-23 09:02:13 -04:00

dm-linear.c

block: Abstract out bvec iterator

2013-11-23 22:33:47 -08:00

dm-log-userspace-base.c

dm log userspace base: fix compile warning

2015-04-15 12:10:20 -04:00

dm-log-userspace-transfer.c

dm log userspace transfer: match wait_for_completion_timeout return type

2015-04-15 12:10:20 -04:00

dm-log-userspace-transfer.h

dm log: userspace add luid to distinguish between concurrent log instances

2009-09-04 20:40:34 +01:00

dm-log-writes.c

dm: add log writes target

2015-04-15 12:10:24 -04:00

dm-log.c

dm: use memweight()

2012-07-30 17:25:16 -07:00

dm-mpath.c

dm: optimize dm_mq_queue_rq to _not_ use kthread if using pure blk-mq

2015-04-15 12:10:17 -04:00

dm-mpath.h

…

dm-path-selector.c

md: Add module.h to all files using it implicitly

2011-10-31 19:31:18 -04:00

dm-path-selector.h

dm mpath: add start_io and nr_bytes to path selectors

2009-06-22 10:12:27 +01:00

dm-queue-length.c

dm: reject trailing characters in sccanf input

2012-03-28 18:41:26 +01:00

dm-raid1.c

block: remove management of bi_remaining when restoring original bi_end_io

2015-05-22 08:58:55 -06:00

dm-raid.c

Merge tag 'dm-3.20-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

2015-02-12 16:36:31 -08:00

dm-region-hash.c

block: Abstract out bvec iterator

2013-11-23 22:33:47 -08:00

dm-round-robin.c

dm: reject trailing characters in sccanf input

2012-03-28 18:41:26 +01:00

dm-service-time.c

dm: reject trailing characters in sccanf input

2012-03-28 18:41:26 +01:00

dm-snap-persistent.c

dm snapshot: remove unnecessary NULL checks before vfree() calls

2015-02-09 13:06:49 -05:00

dm-snap-transient.c

md: Add in export.h for files using EXPORT_SYMBOL

2011-10-31 19:31:19 -04:00

dm-snap.c

block: remove management of bi_remaining when restoring original bi_end_io

2015-05-22 08:58:55 -06:00

dm-stats.c

Merge tag 'dm-3.19-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

2014-12-08 21:10:03 -08:00

dm-stats.h

dm: add statistics support

2013-09-05 20:46:06 -04:00

dm-stripe.c

dm stripe: fix potential for leak in stripe_ctr error path

2014-10-10 22:05:18 -04:00

dm-switch.c

dm switch: efficiently support repetitive patterns

2014-08-01 12:30:37 -04:00

dm-sysfs.c

dm: add 'use_blk_mq' module param and expose in per-device ro sysfs attr

2015-04-15 12:10:17 -04:00

dm-table.c

block, dm: don't copy bios for request clones

2015-05-22 08:58:57 -06:00

dm-target.c

dm: allocate requests in target when stacking on blk-mq devices

2015-02-09 13:06:47 -05:00

dm-thin-metadata.c

dm thin metadata: remove unused dm_pool_get_data_block_size()

2015-02-09 13:06:49 -05:00

dm-thin-metadata.h

dm thin metadata: remove unused dm_pool_get_data_block_size()

2015-02-09 13:06:49 -05:00

dm-thin.c

block: remove management of bi_remaining when restoring original bi_end_io

2015-05-22 08:58:55 -06:00

dm-uevent.c

md: Add in export.h for files using EXPORT_SYMBOL

2011-10-31 19:31:19 -04:00

dm-uevent.h

…

dm-verity.c

block: remove management of bi_remaining when restoring original bi_end_io

2015-05-22 08:58:55 -06:00

dm-zero.c

dm crypt, dm zero: update author name following legal name change

2014-07-10 16:44:14 -04:00

dm.c

block, dm: don't copy bios for request clones

2015-05-22 08:58:57 -06:00

dm.h

block, dm: don't copy bios for request clones

2015-05-22 08:58:57 -06:00

faulty.c

md: rename ->stop to ->free

2015-02-04 08:35:52 +11:00

Kconfig

Merge tag 'md/4.1' of git://neil.brown.name/md

2015-04-24 09:28:01 -07:00

linear.c

md: rename ->stop to ->free

2015-02-04 08:35:52 +11:00

linear.h

md/linear: typedef removal: linear_conf_t -> struct linear_conf

2011-10-11 16:48:54 +11:00

Makefile

Merge tag 'md/4.1' of git://neil.brown.name/md

2015-04-24 09:28:01 -07:00

md-cluster.c

md-cluster: re-add capabilities

2015-04-22 07:59:39 +10:00

md-cluster.h

md-cluster: re-add capabilities

2015-04-22 07:59:39 +10:00

md.c

md: allow resync to go faster when there is competing IO.

2015-04-22 08:00:40 +10:00

md.h

md: remove 'go_faster' option from ->sync_request()

2015-04-22 08:00:40 +10:00

multipath.c

md: rename ->stop to ->free

2015-02-04 08:35:52 +11:00

multipath.h

md/multipath: typedef removal: multipath_conf_t -> struct mpconf

2011-10-11 16:48:57 +11:00

raid0.c

md raid0: access mddev->queue (request queue member) conditionally because it is not set when accessed from dm-raid

2015-04-22 08:00:41 +10:00

raid0.h

md: add proper merge_bvec handling to RAID0 and Linear.

2012-03-19 12:46:39 +11:00

raid1.c

md: remove 'go_faster' option from ->sync_request()

2015-04-22 08:00:40 +10:00

raid1.h

md: make ->congested robust against personality changes.

2015-02-04 08:35:52 +11:00

raid5.c

md/raid5: don't do chunk aligned read on degraded array.

2015-04-22 08:00:43 +10:00

raid5.h

md/raid5: allow the stripe_cache to grow and shrink.

2015-04-22 08:00:43 +10:00

raid10.c

md: remove 'go_faster' option from ->sync_request()

2015-04-22 08:00:40 +10:00

raid10.h

md: make ->congested robust against personality changes.

2015-02-04 08:35:52 +11:00