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NeilBrown bf07bb7d5b md/bitmap: disentangle two different 'pending' flags. 
There are two different 'pending' concepts in the handling of the
write intent bitmap.

Firstly, a 'page' from the bitmap (which container PAGE_SIZE*8 bits)
may have changes (bits cleared) that should be written in due course.
There is no hurry for these and the page will transition from
PENDING to NEEDWRITE and will then be written, though if it ever
becomes DIRTY it will be written much sooner and PENDING will be
cleared.

Secondly, a page of counters - which contains PAGE_SIZE/2 counters, one
for each bit, can usefully have a 'pending' flag which indicates if
any of the counters are low (2 or 1) and ready to be processed by
bitmap_daemon_work().  If this flag is clear we can skip the whole
page.

These two concepts are currently combined in the bitmap-file flag.
This causes a tighter connection between the counters and the bitmap
file than I would like - as I want to add some flexibility to the
bitmap file.

So introduce a new flag with the page-of-counters, and rewrite
bitmap_daemon_work() so that it handles the two different 'pending'
concepts separately.

This also allows us to clear BITMAP_PAGE_PENDING when we write out
a dirty page, which may occasionally reduce the number of times we
write a page.

Signed-off-by: NeilBrown <neilb@suse.de>
 		2012-05-22 13:55:06 +10:00
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accessibility
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acpi Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-04-25 21:29:26 -07:00
amba ARM: 7366/3: amba: Remove AMBA level regulator support 2012-04-13 14:04:08 +01:00
ata libata: forbid port runtime pm by default, fixing regression 2012-04-18 14:33:25 -04:00
atm Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
auxdisplay
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base drivers/base: fix compiler warning in SoC export driver - idr should be ida 2012-04-09 14:54:22 -07:00
bcma bcma: use fallback sprom if no on chip sprom is available 2012-04-16 13:32:01 -04:00
block Fixes in various components: 2012-04-20 11:31:00 -07:00
bluetooth Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth 2012-04-09 15:47:49 -04:00
cdrom
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char tty and serial fixes for 3.4-rc2 2012-04-12 15:36:33 -07:00
clk
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clocksource Revert "clocksource: Load the ACPI PM clocksource asynchronously" 2012-04-12 00:05:05 +02:00
connector
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cpufreq cpufreq: OMAP: fix build errors: depends on ARCH_OMAP2PLUS 2012-04-13 17:57:40 -07:00
cpuidle Merge branches 'idle-fix' and 'misc' into release 2012-04-06 21:48:59 -04:00
crypto crypto: talitos - properly lock access to global talitos registers 2012-04-09 15:13:40 +08:00
dca
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devfreq ARM: global cleanups 2012-03-27 16:03:32 -07:00
dio
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dma Merge branch 'fixes' of git://git.infradead.org/users/vkoul/slave-dma 2012-04-26 15:33:36 -07:00
edac Merge branch 'stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile 2012-04-06 17:56:20 -07:00
eisa
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firewire Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
firmware
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gpio ARM: pxa: fix gpio wakeup setting 2012-04-27 10:46:45 +08:00
gpu drm/i915: Set the Stencil Cache eviction policy to non-LRA mode. 2012-04-28 08:05:15 +01:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2012-04-20 10:39:33 -07:00
hsi HSI: hsi_char: Remove max_data_size from sysfs 2012-04-23 14:23:32 +03:00
hv
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hwmon hwmon: (fam15h_power) Fix pci_device_id array 2012-04-26 08:40:08 -07:00
hwspinlock
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i2c i2c: prevent spurious interrupt on Designware controllers 2012-04-10 08:09:03 -07:00
ide Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
idle simple_open: automatically convert to simple_open() 2012-04-05 15:25:50 -07:00
ieee802154
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infiniband A few fixes for regressions introduced in 3.4-rc1: 2012-04-26 15:35:35 -07:00
input mfd: Convert twl6040 to i2c driver, and separate it from twl core 2012-04-16 16:45:34 +02:00
iommu Merge branch 'akpm' (Andrew's patch-bomb) 2012-04-05 15:30:34 -07:00
isdn tty and serial fixes for 3.4-rc2 2012-04-12 15:36:33 -07:00
leds leds-atmel-pwm.c: Make pwmled_probe() __devinit 2012-04-17 16:29:31 +02:00
lguest
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macintosh Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
mca
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md md/bitmap: disentangle two different 'pending' flags. 2012-05-22 13:55:06 +10:00
media Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2012-04-21 12:43:23 -07:00
memstick
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message Disintegrate and delete asm/system.h 2012-03-28 15:58:21 -07:00
mfd mfd: Fix modular builds of rc5t583 regulator support 2012-04-16 21:27:07 +02:00
misc Merge branch 'akpm' (Andrew's patch-bomb) 2012-04-05 15:30:34 -07:00
mmc Merge branch 'fixes' of git://git.infradead.org/users/vkoul/slave-dma 2012-04-26 15:33:36 -07:00
mtd Merge branch 'fixes' of git://git.infradead.org/users/vkoul/slave-dma 2012-04-26 15:33:36 -07:00
net drivers/net: Do not free an IRQ if its request failed 2012-04-21 16:41:11 -04:00
nfc
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nubus Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
of gpio: Fix range check in of_gpio_simple_xlate() 2012-04-10 14:20:56 -06:00
oprofile simple_open: automatically convert to simple_open() 2012-04-05 15:25:50 -07:00
parisc Disintegrate and delete asm/system.h 2012-03-28 15:58:21 -07:00
parport
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pci Merge branch 'for-v3.4-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2012-04-27 19:32:37 -07:00
pcmcia Merge git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia 2012-03-29 16:00:48 -07:00
pinctrl pinctrl: implement pinctrl_check_ops 2012-04-11 09:31:02 +02:00
platform Merge branch 'akpm' (Andrew's patch-bomb) 2012-04-26 15:24:45 -07:00
pnp Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux 2012-03-30 16:45:39 -07:00
power Various small bugfixes and enhancements, plus two new drivers: 2012-03-30 16:09:02 -07:00
pps
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ps3
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ptp
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rapidio
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regulator regulator: Fix a build warning in the anatop driver for 3.4 2012-04-10 10:26:41 -07:00
remoteproc simple_open: automatically convert to simple_open() 2012-04-05 15:25:50 -07:00
rpmsg
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rtc drivers/rtc/rtc-ds1307.c: fix BUG shown with lock debugging enabled 2012-04-25 21:26:34 -07:00
s390 [S390] s390/char/vmur.c: fix memory leak 2012-04-11 14:28:24 +02:00
sbus Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
scsi SCSI: Fix error handling when no ULD is attached 2012-04-15 11:08:53 -07:00
sfi
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sh SuperH updates for 3.4 merge window 2012-03-30 00:09:17 -07:00
sn
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spi spi/spi-bfin5xx: Fix flush of last bit after each spi transfer 2012-04-27 12:20:39 -06:00
ssb
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staging staging: ozwpan: Fix bug where kfree is called twice. 2012-04-26 12:40:53 -07:00
target tcm_fc: Do not free tpg structure during wq allocation failure 2012-04-06 18:57:05 -07:00
tc
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thermal
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tty drivers/tty/amiserial.c: add missing tty_unlock 2012-04-19 19:15:35 -07:00
uio
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usb usb: fixes for v3.4-rc cycle 2012-04-27 07:50:34 -07:00
uwb uwb: fix error handling 2012-04-18 13:15:51 -07:00
vhost Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-04-22 21:02:57 -07:00
video blackfin: fix compile error in bfin-lq035q1-fb.c 2012-04-26 14:46:51 -04:00
virt
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virtio virtio_balloon: fix handling of PAGE_SIZE != 4k 2012-04-15 11:51:06 +03:00
vlynq
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w1
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watchdog hpwdt: Only BYTE reads/writes to WD Timer port 0x72 2012-04-26 14:38:07 +02:00
xen xen/acpi: Workaround broken BIOSes exporting non-existing C-states. 2012-04-26 22:07:28 -04:00
zorro
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Kconfig Merge branch 'for-next' of git://gitorious.org/kernel-hsi/kernel-hsi 2012-04-02 09:50:40 -07:00
Makefile Merge branch 'for-next' of git://gitorious.org/kernel-hsi/kernel-hsi 2012-04-02 09:50:40 -07:00