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f5db4af466
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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
..
accessibility
acpi Merge branch 'acpica' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2009-06-16 11:24:23 -07:00
amba
ata powerpc/5xxx: Add common mpc5xxx_get_bus_frequency() function 2009-06-17 00:30:22 -06:00
atm
auxdisplay
base Merge branch 'akpm' 2009-06-16 19:50:13 -07:00
block hd: stop defining MAJOR_NR 2009-06-18 09:56:20 +02:00
bluetooth Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6 2009-06-15 03:02:23 -07:00
cdrom
char Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2009-06-20 10:17:02 -07:00
clocksource Merge branches 'sh/pci-express-integration', 'sh/rsk-updates', 'sh/platform-updates' and 'sh/perf_counter' 2009-06-17 16:37:26 +09:00
connector trivial: Kconfig: .ko is normally not included in module names 2009-06-12 18:01:50 +02:00
cpufreq [CPUFREQ] Only set sampling_rate_max deprecated, sampling_rate_min is useful 2009-06-15 11:49:41 -04:00
cpuidle
crypto crypto: padlock-aes - work around Nano CPU errata in CBC mode 2009-06-18 19:31:09 +08:00
dca
dio
dma DMA: TXx9 Soc DMA Controller driver 2009-06-17 11:06:25 +01:00
edac edac: Kconfig: fix the meaning of EDAC abbreviation 2009-06-18 13:03:57 -07:00
eisa Merge branch 'akpm' 2009-06-16 19:50:13 -07:00
firewire Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6 2009-06-16 14:29:46 -07:00
firmware Pull for-2.6.31 into release 2009-06-17 09:35:24 -07:00
gpio gpio: driver for PrimeCell PL061 GPIO controller 2009-06-19 16:46:03 -07:00
gpu drm/i915: enable GEM on PAE. 2009-06-19 10:29:20 +10:00
hid Driver Core: usb: add nodename support for usb drivers. 2009-06-15 21:30:25 -07:00
hwmon Merge branch 'akpm' 2009-06-16 19:50:13 -07:00
i2c Merge branch 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging 2009-06-19 17:45:51 -07:00
ide Merge branch 'for-2.6.31' of git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6 2009-06-20 10:11:11 -07:00
idle i7300_idle: allow testing on i5000-series hardware w/o re-compile 2009-05-28 20:52:40 -04:00
ieee1394 Merge branch 'for-linus2' of git://git.kernel.org/pub/scm/linux/kernel/git/vegard/kmemcheck 2009-06-16 13:09:51 -07:00
ieee802154 ieee802154: fix kconfig bool/tristate muckup 2009-06-13 23:36:29 -07:00
infiniband infiniband: ehca: remove driver_data direct access of struct device 2009-06-15 21:30:27 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2009-06-20 10:17:02 -07:00
isdn net: fix network drivers ndo_start_xmit() return values 2009-06-17 04:31:16 -07:00
leds
lguest Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-lguest 2009-06-12 09:32:26 -07:00
macintosh Merge branch 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging 2009-06-16 11:29:17 -07:00
mca
md dm raid1: add userspace log 2009-06-22 10:12:35 +01:00
media soc-camera: unify i2c camera device platform data 2009-06-17 16:22:34 +09:00
memstick
message convert some DMA_nnBIT_MASK() callers 2009-06-19 16:46:06 -07:00
mfd Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2009-06-20 10:17:02 -07:00
misc gru: copyright fixes 2009-06-18 13:04:04 -07:00
mmc sdhci: remove needless double parenthesis 2009-06-21 21:01:00 +02:00
mtd Merge branch 'linux-next' of git://git.infradead.org/ubi-2.6 2009-06-17 09:48:30 -07:00
net Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2009-06-19 17:40:40 -07:00
nubus
of Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2009-06-15 09:40:05 -07:00
oprofile
parisc parisc: remove driver_data direct access of struct device 2009-06-15 21:30:28 -07:00
parport parport: remove driver_data direct access of struct device 2009-06-15 21:30:28 -07:00
pci Fix pci_claim_resource 2009-06-17 14:04:42 -07:00
pcmcia Merge branch 'akpm' 2009-06-16 19:50:13 -07:00
platform dell-laptop: fix rfkill conversion 2009-06-15 15:05:58 -04:00
pnp Merge branch 'drm-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6 2009-06-12 18:09:18 -07:00
power
pps LinuxPPS: core support 2009-06-18 13:04:04 -07:00
ps3 drivers/ps3: Add missing annotations 2009-06-15 16:47:25 +10:00
rapidio rio: warn_unused_result warnings fix 2009-06-15 21:45:32 -05:00
regulator regulator/max1586: fix V3 gain calculation integer overflow 2009-06-15 11:18:27 +01:00
rtc rtc: make rtc_update_irq callable with irqs enabled 2009-06-19 16:46:05 -07:00
s390 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2009-06-18 14:07:15 -07:00
sbus openprom: Squelch useless GCC warning. 2009-06-16 04:56:57 -07:00
scsi Merge commit 'origin/master' into next 2009-06-18 11:16:55 +10:00
serial Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2009-06-19 17:40:40 -07:00
sh sh: intc: alloc_bootmem() -> kzalloc() conversion. 2009-06-12 01:34:12 +03:00
sn
spi spi_mpc8xxx: s/83xx/8xxx/g 2009-06-19 16:46:05 -07:00
ssb SSB: BCM47xx: Export ssb_watchdog_timer_set 2009-06-08 16:57:50 +01:00
staging Staging: comedi: fix build errors 2009-06-19 11:04:32 -07:00
tc
telephony
thermal thermal: remove driver_data direct access of struct device 2009-06-15 21:30:27 -07:00
uio
usb Merge commit 'origin/master' into next 2009-06-18 11:16:55 +10:00
uwb
video Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2009-06-19 17:40:40 -07:00
virtio virtio: enhance id_matching for virtio drivers 2009-06-12 22:16:40 +09:30
vlynq drivers: add support for the TI VLYNQ bus 2009-06-16 19:47:52 -07:00
w1 w1-gpio: add external pull-up enable callback 2009-06-18 13:03:58 -07:00
watchdog Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2009-06-19 17:40:40 -07:00
xen PM core: rename suspend and resume functions 2009-06-12 21:32:31 +02:00
zorro
Kconfig LinuxPPS: core support 2009-06-18 13:04:04 -07:00
Makefile LinuxPPS: core support 2009-06-18 13:04:04 -07:00