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dba141601d
linux/drivers/md
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Mikulas Patocka dba141601d dm: store dm_target_io in bio front_pad 
Use the recently-added bio front_pad field to allocate struct dm_target_io.

Prior to this patch, dm_target_io was allocated from a mempool. For each
dm_target_io, there is exactly one bio allocated from a bioset.

This patch merges these two allocations into one allocation: we create a
bioset with front_pad equal to the size of dm_target_io so that every
bio allocated from the bioset has sizeof(struct dm_target_io) bytes
before it. We allocate a bio and use the bytes before the bio as
dm_target_io.

_tio_cache is removed and the tio_pool mempool is now only used for
request-based devices.

This idea was introduced by Kent Overstreet.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: Kent Overstreet <koverstreet@google.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: tj@kernel.org
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Bill Pemberton <wfp5p@viridian.itc.virginia.edu>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2012-10-12 21:02:15 +01:00
..
persistent-data dm persistent data: convert to use le32_add_cpu 2012-10-12 16:59:47 +01:00
bitmap.c md/raid1: submit IO from originating thread instead of md thread. 2012-08-02 08:33:20 +10:00
bitmap.h md/bitmap: record the space available for the bitmap in the superblock. 2012-05-22 13:55:34 +10:00
dm-bio-prison.c dm thin: move bio_prison code to separate module 2012-10-12 21:02:13 +01:00
dm-bio-prison.h dm thin: move bio_prison code to separate module 2012-10-12 21:02:13 +01:00
dm-bio-record.h
dm-bufio.c dm: use ACCESS_ONCE for sysfs values 2012-10-12 16:59:46 +01:00
dm-bufio.h dm bufio: prefetch 2012-03-28 18:41:29 +01:00
dm-crypt.c block: Add bio_clone_bioset(), bio_clone_kmalloc() 2012-09-09 10:35:39 +02:00
dm-delay.c dm thin: commit before gathering status 2012-07-27 15:08:16 +01:00
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 dm thin: commit before gathering status 2012-07-27 15:08:16 +01:00
dm-io.c block: Generalized bio pool freeing 2012-09-09 10:35:38 +02:00
dm-ioctl.c dm thin: commit before gathering status 2012-07-27 15:08:16 +01:00
dm-kcopyd.c dm kcopyd: add dm_kcopyd_zero to zero an area 2011-10-31 20:18:58 +00:00
dm-linear.c dm thin: commit before gathering status 2012-07-27 15:08:16 +01:00
dm-log-userspace-base.c Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2011-11-06 19:44:47 -08:00
dm-log-userspace-transfer.c connector/userns: replace netlink uses of cap_raised() with capable() 2012-05-10 23:21:39 -04:00
dm-log-userspace-transfer.h
dm-log.c dm: use memweight() 2012-07-30 17:25:16 -07:00
dm-mpath.c dm mpath: fix check for null mpio in end_io fn 2012-10-12 16:59:42 +01:00
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-queue-length.c dm: reject trailing characters in sccanf input 2012-03-28 18:41:26 +01:00
dm-raid1.c workqueue: deprecate flush[_delayed]_work_sync() 2012-08-20 14:51:24 -07:00
dm-raid.c Merge branch 'for-next' of git://neil.brown.name/md 2012-08-01 09:02:01 -07:00
dm-region-hash.c dm raid1: fix crash with mirror recovery and discard 2012-07-20 14:25:03 +01:00
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 md: Add in export.h for files using EXPORT_SYMBOL 2011-10-31 19:31:19 -04:00
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 dm thin: commit before gathering status 2012-07-27 15:08:16 +01:00
dm-stripe.c workqueue: deprecate flush[_delayed]_work_sync() 2012-08-20 14:51:24 -07:00
dm-sysfs.c Driver core: Constify struct sysfs_ops in struct kobj_type 2010-03-07 17:04:49 -08:00
dm-table.c dm: retain table limits when swapping to new table with no devices 2012-09-26 23:45:45 +01:00
dm-target.c dm: error return error for discards 2010-08-12 04:14:14 +01:00
dm-thin-metadata.c dm thin metadata: introduce dm_pool_abort_metadata 2012-07-27 15:08:15 +01:00
dm-thin-metadata.h dm thin metadata: introduce dm_pool_abort_metadata 2012-07-27 15:08:15 +01:00
dm-thin.c dm thin: move bio_prison code to separate module 2012-10-12 21:02:13 +01:00
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 dm: use ACCESS_ONCE for sysfs values 2012-10-12 16:59:46 +01:00
dm-zero.c dm: zero silently drop discards 2010-08-12 04:14:12 +01:00
dm.c dm: store dm_target_io in bio front_pad 2012-10-12 21:02:15 +01:00
dm.h dm: retain table limits when swapping to new table with no devices 2012-09-26 23:45:45 +01:00
faulty.c md: tidy up rdev_for_each usage. 2012-03-19 12:46:39 +11:00
Kconfig dm thin: move bio_prison code to separate module 2012-10-12 21:02:13 +01:00
linear.c md/linear: If md_integrity_register() fails, linear_run() must free the mem. 2012-04-02 09:48:37 +10:00
linear.h md/linear: typedef removal: linear_conf_t -> struct linear_conf 2011-10-11 16:48:54 +11:00
Makefile dm thin: move bio_prison code to separate module 2012-10-12 21:02:13 +01:00
md.c Merge branch 'for-3.7/core' of git://git.kernel.dk/linux-block 2012-10-11 09:04:23 +09:00
md.h blk: pass from_schedule to non-request unplug functions. 2012-07-31 09:08:15 +02:00
multipath.c md: make 'name' arg to md_register_thread non-optional. 2012-07-03 15:56:52 +10:00
multipath.h md/multipath: typedef removal: multipath_conf_t -> struct mpconf 2011-10-11 16:48:57 +11:00
raid0.c block: Implement support for WRITE SAME 2012-09-20 14:31:45 +02:00
raid0.h md: add proper merge_bvec handling to RAID0 and Linear. 2012-03-19 12:46:39 +11:00
raid1.c Additional md update for 3.6 2012-08-02 11:34:40 -07:00
raid1.h md/raid1: prevent merging too large request 2012-07-31 10:03:53 +10:00
raid5.c md/raid5: add missing spin_lock_init. 2012-09-24 16:27:20 +10:00
raid5.h Additional md update for 3.6 2012-08-02 11:34:40 -07:00
raid10.c md/raid10: fix "enough" function for detecting if array is failed. 2012-09-27 12:35:21 +10:00
raid10.h md/raid10: fix problem with on-stack allocation of r10bio structure. 2012-08-18 09:51:42 +10:00