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Jonthan Brassow f5db4af466 dm raid1: add userspace log 
This patch contains a device-mapper mirror log module that forwards
requests to userspace for processing.

The structures used for communication between kernel and userspace are
located in include/linux/dm-log-userspace.h.  Due to the frequency,
diversity, and 2-way communication nature of the exchanges between
kernel and userspace, 'connector' was chosen as the interface for
communication.

The first log implementations written in userspace - "clustered-disk"
and "clustered-core" - support clustered shared storage.   A userspace
daemon (in the LVM2 source code repository) uses openAIS/corosync to
process requests in an ordered fashion with the rest of the nodes in the
cluster so as to prevent log state corruption.  Other implementations
with no association to LVM or openAIS/corosync, are certainly possible.

(Imagine if two machines are writing to the same region of a mirror.
They would both mark the region dirty, but you need a cluster-aware
entity that can handle properly marking the region clean when they are
done.  Otherwise, you might clear the region when the first machine is
done, not the second.)

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Cc: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
 		2009-06-22 10:12:35 +01:00
..
raid6test md/raid6: move raid6 data processing to raid6_pq.ko 2009-03-31 15:09:39 +11:00
.gitignore gitignore: misc files 2006-01-01 22:21:50 +01:00
Kconfig dm raid1: add userspace log 2009-06-22 10:12:35 +01:00
Makefile dm raid1: add userspace log 2009-06-22 10:12:35 +01:00
bitmap.c Merge branch 'for-2.6.31' of git://git.kernel.dk/linux-2.6-block 2009-06-11 11:10:35 -07:00
bitmap.h md: move headers out of include/linux/raid/ 2009-03-31 14:27:03 +11:00
dm-bio-record.h dm: preserve bi_io_vec when resubmitting bios 2009-04-02 19:55:23 +01:00
dm-crypt.c dm target:s introduce iterate devices fn 2009-06-22 10:12:33 +01:00
dm-delay.c dm target:s introduce iterate devices fn 2009-06-22 10:12:33 +01:00
dm-exception-store.c dm exception store: fix exstore lookup to be case insensitive 2009-06-22 10:12:15 +01:00
dm-exception-store.h dm: use i_size_read 2009-06-22 10:12:14 +01:00
dm-io.c dm io: retry after barrier error 2009-06-22 10:12:26 +01:00
dm-ioctl.c dm ioctl: support cookies for udev 2009-06-22 10:12:30 +01:00
dm-kcopyd.c dm kcopyd: fix callback race 2009-04-09 00:27:17 +01:00
dm-linear.c dm target:s introduce iterate devices fn 2009-06-22 10:12:33 +01:00
dm-log-userspace-base.c dm raid1: add userspace log 2009-06-22 10:12:35 +01:00
dm-log-userspace-transfer.c dm raid1: add userspace log 2009-06-22 10:12:35 +01:00
dm-log-userspace-transfer.h dm raid1: add userspace log 2009-06-22 10:12:35 +01:00
dm-log.c dm log: fix create_log_context to use logical_block_size of log device 2009-06-22 10:12:33 +01:00
dm-mpath.c dm target:s introduce iterate devices fn 2009-06-22 10:12:33 +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 dm target:s introduce iterate devices fn 2009-06-22 10:12:33 +01:00
dm-region-hash.c dm raid1: keep retrying alloc if mempool_alloc failed 2009-06-22 10:12:13 +01:00
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 dm mpath: add service time load balancer 2009-06-22 10:12:28 +01:00
dm-snap-persistent.c dm snapshot: use barrier when writing exception store 2009-06-22 10:12:26 +01:00
dm-snap-transient.c dm snapshot: move status to exception store 2009-04-02 19:55:35 +01:00
dm-snap.c dm snapshot: support barriers 2009-06-22 10:12:25 +01:00
dm-stripe.c dm target:s introduce iterate devices fn 2009-06-22 10:12:33 +01:00
dm-sysfs.c dm: sysfs add suspended attribute 2009-06-22 10:12:29 +01:00
dm-table.c dm: calculate queue limits during resume not load 2009-06-22 10:12:34 +01:00
dm-target.c dm target: remove struct tt_internal 2009-04-02 19:55:28 +01:00
dm-uevent.c md: replace remaining __FUNCTION__ occurrences 2008-04-28 08:58:42 -07:00
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: calculate queue limits during resume not load 2009-06-22 10:12:34 +01:00
dm.h dm: calculate queue limits during resume not load 2009-06-22 10:12:34 +01:00
faulty.c md: Move check for bitmap presence to personality code. 2009-06-18 08:49:23 +10:00
linear.c md/linear: use call_rcu to free obsolete 'conf' structures. 2009-06-18 08:49:42 +10:00
linear.h md/linear: use call_rcu to free obsolete 'conf' structures. 2009-06-18 08:49:42 +10:00
md.c md: Move check for bitmap presence to personality code. 2009-06-18 08:49:23 +10:00
md.h md: Move check for bitmap presence to personality code. 2009-06-18 08:49:23 +10:00
mktables.c md/raid6: move raid6 data processing to raid6_pq.ko 2009-03-31 15:09:39 +11:00
multipath.c md: Move check for bitmap presence to personality code. 2009-06-18 08:49:23 +10:00
multipath.h md: remove mddev_to_conf "helper" macro 2009-06-16 16:54:21 +10:00
raid0.c md: Move check for bitmap presence to personality code. 2009-06-18 08:49:23 +10:00
raid0.h md: remove mddev_to_conf "helper" macro 2009-06-16 16:54:21 +10:00
raid1.c md: Push down reconstruction log message to personality code. 2009-06-18 08:48:06 +10:00
raid1.h md: remove mddev_to_conf "helper" macro 2009-06-16 16:54:21 +10:00
raid5.c md/raid5: correctly update sync_completed when we reach max_resync 2009-06-18 09:14:12 +10:00
raid5.h md: convert conf->chunk_size and conf->prev_chunk to sectors. 2009-06-18 08:45:55 +10:00
raid6algos.c md/raid6: move raid6 data processing to raid6_pq.ko 2009-03-31 15:09:39 +11:00
raid6altivec.uc md/raid6: move raid6 data processing to raid6_pq.ko 2009-03-31 15:09:39 +11:00
raid6int.uc md/raid6: move raid6 data processing to raid6_pq.ko 2009-03-31 15:09:39 +11:00
raid6mmx.c md/raid6: move raid6 data processing to raid6_pq.ko 2009-03-31 15:09:39 +11:00
raid6recov.c md/raid6: move raid6 data processing to raid6_pq.ko 2009-03-31 15:09:39 +11:00
raid6sse1.c md/raid6: move raid6 data processing to raid6_pq.ko 2009-03-31 15:09:39 +11:00
raid6sse2.c md/raid6: move raid6 data processing to raid6_pq.ko 2009-03-31 15:09:39 +11:00
raid6x86.h md: fix typo in FSF address 2009-03-31 14:57:37 +11:00
raid10.c md: Push down reconstruction log message to personality code. 2009-06-18 08:48:06 +10:00
raid10.h md: remove mddev_to_conf "helper" macro 2009-06-16 16:54:21 +10:00
unroll.pl Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00