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NeilBrown 409c57f380 md: enable suspend/resume of md devices. 
To be able to change the 'level' of an md/raid array, we need to
suspend the device so that no requests are active - then move some
pointers around etc.

The code already keeps counts of active requests and the ->quiesce
function can be used to wait until those counts hit zero.
However the quiesce function blocks new requests once they are all
ready 'inside' the personality module, and that is too late if we want
to replace the personality modules.

So make all md requests come in through a common md_make_request
function that keeps track of how many requests have entered the
modules but may not yet be on the internal reference counts.
Allow md_make_request to be blocked when we want to suspend the
device, and make it possible to wait for all those in-transit requests
to be added to internal lists so that ->quiesce can wait for them.

There is still a problem that when a request completes, we drop the
ref count inside the personality code so there is a short time between
when the refcount hits zero, and when the personality code is no
longer being used.
The personality code never blocks (schedule or spinlock) between
dropping the refcount and exiting the routine, so this should be safe
(as put_module calls synchronize_sched() before unmapping the module
code).

Signed-off-by: NeilBrown <neilb@suse.de>
 		2009-03-31 14:39:39 +11:00
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accessibility
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acpi Merge branches 'release', 'bugzilla-12011', 'bugzilla-12632', 'misc' and 'suspend' into release 2009-02-21 22:01:43 -05:00
amba [ARM] Fix realview build 2009-01-08 16:29:41 +00:00
ata libata: Don't trust current capacity values in identify words 57-58 2009-03-05 07:26:10 -05:00
atm ATM: misplaced parentheses? 2009-02-18 17:41:38 -08:00
auxdisplay
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base PM: Split up sysdev_[suspend|resume] from device_power_[down|up], fix 2009-02-22 22:09:33 +01:00
block Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2009-03-09 09:15:40 -07:00
bluetooth
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cdrom
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char m68k: atari - Rename "mfp" to "st_mfp" 2009-02-22 09:23:02 -08:00
clocksource Merge branch 'cpus4096-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-01-02 11:44:09 -08:00
connector
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cpufreq Revert "[CPUFREQ] Disable sysfs ui for p4-clockmod." 2009-03-09 15:07:33 -04:00
cpuidle cpuidle: Add decaying history logic to menu idle predictor 2008-12-30 18:48:01 -05:00
crypto crypto: ixp4xx - Fix qmgr_request_queue build failure 2009-03-04 08:01:22 +08:00
dca I/OAT: update driver version and copyright dates 2009-03-04 16:04:40 -07:00
dio m68k: dio - Kill resource_size_t format warnings 2009-01-12 20:56:42 +01:00
dma Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx 2009-03-08 10:23:05 -07:00
edac powerpc: More printing warning fixes for the l64 to ll64 conversion 2009-01-28 17:15:52 +11:00
eisa
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firewire firewire: core: Remove card from list of cards when enable fails 2009-02-01 11:17:24 +01:00
firmware Bernhard has moved 2009-02-18 15:37:56 -08:00
gpio gpiolib: fix request related issue 2009-01-29 18:04:43 -08:00
gpu drm: fix double lock typo 2009-03-04 21:49:14 +10:00
hid HID: move tmff and zpff devices from ignore_list to blacklist 2009-02-17 13:25:01 +01:00
hwmon lis3lv02d: add axes knowledge of HP Pavilion dv5 models 2009-02-18 15:37:54 -08:00
i2c Merge master.kernel.org:/home/rmk/linux-2.6-arm 2009-03-03 14:12:41 -08:00
ide ide: add at91_ide driver 2009-03-05 16:10:58 +01:00
idle i7300_idle: struct device - replace bus_id with dev_name(), dev_set_name() 2009-01-06 10:44:39 -08:00
ieee1394 Make ieee1394_init a fs-initcall 2009-02-26 10:32:31 -08:00
infiniband Merge branches 'ehca', 'ipoib' and 'mlx4' into for-linus 2009-01-16 15:05:54 -08:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2009-03-02 15:43:03 -08:00
isdn ISDN: fix sc/shmem printk format warning 2009-02-20 00:54:44 -08:00
leds lis3lv02d: merge with leds hp disk 2009-01-15 16:39:40 -08:00
lguest lguest: fix for CONFIG_SPARSE_IRQ=y 2009-03-09 10:06:29 +10:30
macintosh Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-01-07 11:31:52 -08:00
mca
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md md: enable suspend/resume of md devices. 2009-03-31 14:39:39 +11:00
media Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2009-03-02 15:43:03 -08:00
memstick memstick: annotate endianness of attribute structs 2009-01-09 16:54:41 -08:00
message [SCSI] mpt: fix disable lsi sas to use msi as default 2009-02-22 08:51:07 -06:00
mfd mfd: Fix sm501_register_gpio section mismatch 2009-02-17 09:48:05 +01:00
misc hpilo: new pci device 2009-02-27 16:26:22 -08:00
mmc mmc: fix data timeout for SEND_EXT_CSD 2009-03-08 14:46:04 +01:00
mtd Merge master.kernel.org:/home/rmk/linux-2.6-arm 2009-03-03 14:12:41 -08:00
net p54: fix race condition in memory management 2009-03-06 15:54:32 -05:00
nubus
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of drivers/of: Add the of_find_i2c_device_by_node function. 2009-01-09 15:49:06 -07:00
oprofile oprofile: fix uninitialized use of struct op_entry 2009-01-17 17:26:39 +01:00
parisc Documentation: move DMA-mapping.txt to Doc/PCI/ 2009-01-29 18:19:29 -08:00
parport m68k: atari - Rename "mfp" to "st_mfp" 2009-02-22 09:23:02 -08:00
pci Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 2009-02-26 14:43:42 -08:00
pcmcia powerpc: Change u64/s64 to a long long integer type 2009-01-13 14:47:59 +11:00
platform fujitsu-laptop: Use RFKILL support bitmask from firmware 2009-02-21 21:59:55 -05:00
pnp Merge branch 'linus' into release 2009-01-09 03:39:43 -05:00
power pcf50633_charger: Fix typo 2009-02-02 19:53:02 +03:00
ps3 powerpc/ps3: Printing fixups for l64 to ll64 conversion drivers/ps3 2009-01-16 16:15:14 +11:00
rapidio rapidio: remove excess kernel-doc notation 2009-01-06 15:59:28 -08:00
regulator leds: Fix bounds checking of wm8350->pmic.led 2009-01-30 21:50:49 +00:00
rtc rtc: t reaches -1, tested 0 2009-02-11 14:25:36 -08:00
s390 [S390] fix "mem=" handling in case of standby memory 2009-02-19 15:19:19 +01:00
sbus sparc64: Fix unsigned long long warnings in drivers. 2009-01-06 13:20:38 -08:00
scsi [SCSI] fix ABORTED_COMMAND looping forever problem 2009-02-21 20:29:38 -06:00
serial Merge branch 'sh/for-2.6.29' of git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6 2009-02-27 16:40:00 -08:00
sh
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sn
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spi spi-gpio: sanitize MISO bitvalue 2009-02-18 15:37:56 -08:00
ssb
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staging Staging: w35und: fix usb_control_msg() error handling in wb35_probe() 2009-02-27 12:56:24 -08:00
tc
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telephony
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thermal thermal: struct device - replace bus_id with dev_name(), dev_set_name() 2009-01-06 10:44:37 -08:00
uio UIO: Pass information about ioports to userspace (V2) 2009-01-06 10:44:44 -08:00
usb USB: musb: fix srp sysfs entry deletion 2009-02-27 14:40:51 -08:00
uwb uwb: lock rc->rsvs_lock with spin_lock_bh() 2009-01-23 12:57:20 +00:00
video Merge master.kernel.org:/home/rmk/linux-2.6-arm 2009-03-03 14:12:41 -08:00
virtio virtio-pci: do not oops on config change if driver not loaded 2009-02-02 19:17:56 -08:00
w1 w1: add missing Kconfig/Makefile entries for DS2431 slave driver 2009-02-27 16:26:21 -08:00
watchdog [WATCHDOG] orion5x_wdt.c: 'ORION5X_TCLK' undeclared 2009-03-05 19:25:05 +00:00
xen PM: Split up sysdev_[suspend|resume] from device_power_[down|up] 2009-02-22 10:33:44 -08:00
zorro m68k: zorro - Use %pR to print resources 2009-01-12 20:56:43 +01:00
Kconfig
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Makefile Merge branch 'drivers-platform' into release 2009-01-09 04:56:56 -05:00