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mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-30 08:04:13 +08:00
linux-next/drivers/md
Mike Snitzer 4a0b4ddf26 dm: do not initialise full request queue when bio based
Change bio-based mapped devices no longer to have a fully initialized
request_queue (request_fn, elevator, etc).  This means bio-based DM
devices no longer register elevator sysfs attributes ('iosched/' tree
or 'scheduler' other than "none").

In contrast, a request-based DM device will continue to have a full
request_queue and will register elevator sysfs attributes.  Therefore
a user can determine a DM device's type by checking if elevator sysfs
attributes exist.

First allocate a minimalist request_queue structure for a DM device
(needed for both bio and request-based DM).

Initialization of a full request_queue is deferred until it is known
that the DM device is request-based, at the end of the table load
sequence.

Factor DM device's request_queue initialization:
- common to both request-based and bio-based into dm_init_md_queue().
- specific to request-based into dm_init_request_based_queue().

The md->type_lock mutex is used to protect md->queue, in addition to
md->type, during table_load().

A DM device's first table_load will establish the immutable md->type.
But md->queue initialization, based on md->type, may fail at that time
(because blk_init_allocated_queue cannot allocate memory).  Therefore
any subsequent table_load must (re)try dm_setup_md_queue independently of
establishing md->type.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Acked-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2010-08-12 04:14:02 +01:00
..
.gitignore
bitmap.c md/bitmap: separate out loading a bitmap from initialising the structures. 2010-07-26 13:21:34 +10:00
bitmap.h md/bitmap: separate out loading a bitmap from initialising the structures. 2010-07-26 13:21:34 +10:00
dm-bio-record.h dm: preserve bi_io_vec when resubmitting bios 2009-04-02 19:55:23 +01:00
dm-crypt.c dm crypt: use kstrdup 2010-08-12 04:13:58 +01:00
dm-delay.c dm table: remove unused dm_get_device range parameters 2010-03-06 02:32:27 +00:00
dm-exception-store.c dm snapshot: test chunk size against both origin and snapshot 2010-08-12 04:13:51 +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-io.c block: unify flags for struct bio and struct request 2010-08-07 18:20:39 +02:00
dm-ioctl.c dm: do not initialise full request queue when bio based 2010-08-12 04:14:02 +01:00
dm-kcopyd.c block: unify flags for struct bio and struct request 2010-08-07 18:20:39 +02:00
dm-linear.c dm table: remove unused dm_get_device range parameters 2010-03-06 02:32:27 +00:00
dm-log-userspace-base.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
dm-log-userspace-transfer.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
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.c dm table: remove unused dm_get_device range parameters 2010-03-06 02:32:27 +00:00
dm-mpath.c dm mpath: fix NULL pointer dereference when path parameters missing 2010-08-12 04:13:49 +01:00
dm-mpath.h dm mpath: remove is_active from struct dm_path 2008-10-10 13:36:58 +01:00
dm-path-selector.c dm: path selector use module refcount directly 2009-04-02 19:55:27 +01:00
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 mpath: add queue length load balancer 2009-06-22 10:12:27 +01:00
dm-raid1.c block: unify flags for struct bio and struct request 2010-08-07 18:20:39 +02:00
dm-region-hash.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
dm-round-robin.c dm mpath: add start_io and nr_bytes to path selectors 2009-06-22 10:12:27 +01:00
dm-service-time.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
dm-snap-persistent.c dm snapshot: persistent use define for disk header chunk size 2010-08-12 04:13:59 +01:00
dm-snap-transient.c dm snapshot: move cow ref from exception store to snap core 2009-12-10 23:52:12 +00:00
dm-snap.c dm snapshot: test chunk size against both origin and snapshot 2010-08-12 04:13:51 +01:00
dm-stripe.c block: unify flags for struct bio and struct request 2010-08-07 18:20:39 +02:00
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 table: remove unused dm_get_device range parameters 2010-03-06 02:32:27 +00:00
dm-target.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
dm-uevent.c dm table: remove dm_get from dm_table_get_md 2010-03-06 02:29:52 +00:00
dm-uevent.h dm: uevent generate events 2007-10-20 02:01:26 +01:00
dm-zero.c dm: consolidate target deregistration error handling 2009-01-06 03:04:58 +00:00
dm.c dm: do not initialise full request queue when bio based 2010-08-12 04:14:02 +01:00
dm.h dm: do not initialise full request queue when bio based 2010-08-12 04:14:02 +01:00
faulty.c Merge commit '3ff195b011d7decf501a4d55aeed312731094796' into for-linus 2010-05-22 08:31:36 +10:00
Kconfig Merge branch 'async' of macbook:git/btrfs-unstable 2010-08-09 10:36:44 +01:00
linear.c block: unify flags for struct bio and struct request 2010-08-07 18:20:39 +02:00
linear.h md/linear: use call_rcu to free obsolete 'conf' structures. 2009-06-18 08:49:42 +10:00
Makefile Merge branch 'async' of macbook:git/btrfs-unstable 2010-08-09 10:36:44 +01:00
md.c Merge branch 'for-linus' of git://neil.brown.name/md 2010-08-10 15:38:19 -07:00
md.h Merge branch 'for-linus' of git://neil.brown.name/md 2010-08-10 15:38:19 -07:00
multipath.c block: unify flags for struct bio and struct request 2010-08-07 18:20:39 +02:00
multipath.h md: remove mddev_to_conf "helper" macro 2009-06-16 16:54:21 +10:00
raid0.c block: unify flags for struct bio and struct request 2010-08-07 18:20:39 +02:00
raid0.h md: fix handling of array level takeover that re-arranges devices. 2010-06-24 13:33:24 +10:00
raid1.c block: unify flags for struct bio and struct request 2010-08-07 18:20:39 +02:00
raid1.h md/raid1: add takeover support for raid5->raid1 2009-12-14 12:51:41 +11:00
raid5.c Merge branch 'for-linus' of git://neil.brown.name/md 2010-08-10 15:38:19 -07:00
raid5.h md/raid5: export raid5 unplugging interface. 2010-07-26 12:53:10 +10:00
raid10.c Merge branch 'for-linus' of git://neil.brown.name/md 2010-08-10 15:38:19 -07:00
raid10.h md: fix handling of array level takeover that re-arranges devices. 2010-06-24 13:33:24 +10:00