Joe Thornber 2ee57d5873 dm cache: add passthrough mode ... "Passthrough" is a dm-cache operating mode (like writethrough or writeback) which is intended to be used when the cache contents are not known to be coherent with the origin device. It behaves as follows: * All reads are served from the origin device (all reads miss the cache) * All writes are forwarded to the origin device; additionally, write hits cause cache block invalidates This mode decouples cache coherency checks from cache device creation, largely to avoid having to perform coherency checks while booting. Boot scripts can create cache devices in passthrough mode and put them into service (mount cached filesystems, for example) without having to worry about coherency. Coherency that exists is maintained, although the cache will gradually cool as writes take place. Later, applications can perform coherency checks, the nature of which will depend on the type of the underlying storage. If coherency can be verified, the cache device can be transitioned to writethrough or writeback mode while still warm; otherwise, the cache contents can be discarded prior to transitioning to the desired operating mode. Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com> Signed-off-by: Morgan Mears <Morgan.Mears@netapp.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>		2013-11-11 11:37:49 -05:00
..
ABI	- factor out common code from MTD tests	2013-09-09 10:33:19 -07:00
accounting	Documentation/accounting/getdelays.c: avoid strncpy in accounting tool	2013-07-03 16:08:06 -07:00
acpi	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2013-09-06 09:36:28 -07:00
aoe	aoe: remove do-nothing NAME="%k" term from example udev rules	2013-09-11 15:59:28 -07:00
arm	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2013-09-06 09:36:28 -07:00
arm64	arm64: documentation: tighten up tagged pointer documentation	2013-09-20 09:56:06 +01:00
auxdisplay
backlight	backlight: lp855x: remove duplicate platform data	2013-04-29 18:28:19 -07:00
blackfin
block	block: change config option name for cmdline partition parsing	2013-09-30 14:31:02 -07:00
blockdev
bus-devices
cdrom
cgroups	memcg: document cgroup dirty/writeback memory statistics	2013-09-12 15:38:02 -07:00
connector
console	TTY:console: update document console.txt	2013-05-21 10:21:57 -07:00
cpu-freq	cpufreq: Drop the owner field from struct cpufreq_driver	2013-08-10 03:24:47 +02:00
cpuidle	cpuidle: make a single register function for all	2013-04-23 13:45:22 +02:00
cris
crypto	drivers/dma: remove unused support for MEMSET operations	2013-07-03 16:07:42 -07:00
development-process	Documentation: development-process: Update -mm and -next URLs	2013-07-25 12:37:24 +02:00
device-mapper	dm cache: add passthrough mode	2013-11-11 11:37:49 -05:00
devicetree	ARM: SoC fixes for 3.12-rc	2013-10-02 21:48:32 -07:00
DocBook	- factor out common code from MTD tests	2013-09-09 10:33:19 -07:00
driver-model	Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma	2013-09-10 13:37:36 -07:00
dvb
early-userspace	Documentation: remove reference to 2.7 kernel in early-userspace	2013-08-20 12:47:28 +02:00
EDID	drm: Add 1600x1200 (UXGA) screen resolution to the built-in EDIDs	2013-04-12 14:06:16 +10:00
extcon
fault-injection
fb	Documentation/fb/viafb.modes fix a typo	2013-08-20 12:41:11 +02:00
filesystems	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-09-18 19:22:22 -05:00
firmware_class
fmc	doc: Fix typo "is is" in Documentations	2013-08-27 10:50:52 +02:00
frv
hid	HID: uhid: use generic hidinput_input_event()	2013-07-31 10:33:05 +02:00
hwmon	Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging	2013-09-07 10:54:19 -07:00
i2c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2013-09-06 09:36:28 -07:00
i2o
ia64	Fix example error_injection_tool	2013-04-02 09:39:55 -07:00
ide
infiniband
input	Merge branch 'master' into for-3.12/upstream	2013-09-04 10:49:57 +02:00
ioctl	s390/sclp: Add SCLP character device driver	2013-06-26 21:10:13 +02:00
isdn
ja_JP	HOWTO ja_JP sync	2013-07-24 22:06:34 -07:00
kbuild	kconfig: do not allow more than one symbol to have 'option modules'	2013-09-05 11:10:08 +02:00
kdump	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2013-07-04 11:40:58 -07:00
ko_KR	Correct unfaithful translation on HOWTO in ko_KR	2013-08-12 17:43:13 -07:00
laptops	platform / thinkpad: Remove deprecated hotkey_report_mode parameter	2013-07-15 13:57:00 +02:00
leds	Documentation: leds-lp5521,lp5523: update device attribute information	2013-08-26 17:22:13 -07:00
m68k	block: remove refs to XD disks from documentation	2013-05-17 15:17:12 +02:00
make
memory-devices
metag	doc: fix misspellings with 'codespell' tool	2013-05-28 12:02:12 +02:00
mips
misc-devices	doc: fix misspellings with 'codespell' tool	2013-05-28 12:02:12 +02:00
mmc	mmc: core: Add in support to expose PRV for v4 MMCs	2013-03-22 12:10:42 -04:00
mn10300
mtd	doc: Fix typo "is is" in Documentations	2013-08-27 10:50:52 +02:00
namespaces
netlabel
networking	bonding: Make alb learning packet interval configurable	2013-09-15 22:20:44 -04:00
nfc
parisc	parisc: document the shadow registers	2013-07-09 22:09:19 +02:00
PCI
pcmcia
power	power: Documentation: Update s2ram link	2013-08-27 10:54:52 +02:00
powerpc	powerpc: Update the 00-Index in Documentation/powerpc	2013-08-27 14:44:27 +10:00
pps
prctl
pti
ptp
rapidio	doc: Fix typo in doucmentations	2013-07-25 12:34:15 +02:00
RCU	Merge branches 'doc.2013.08.19a', 'fixes.2013.08.20a', 'sysidle.2013.08.31a' and 'torture.2013.08.20a' into HEAD	2013-08-31 14:44:45 -07:00
s390	s390/cio: add condev keyword to cio_ignore	2013-05-02 15:50:20 +02:00
scheduler	sched/Documentation: Update sched-design-CFS.txt documentation	2013-09-12 19:14:17 +02:00
scsi	SCSI misc on 20130915	2013-09-15 17:41:30 -04:00
security	Smack: add support for modification of existing rules	2013-03-19 14:16:42 -07:00
serial	stallion: final cleanup	2013-06-03 14:31:39 -07:00
sh
sound	ALSA: hda - Add a headset mic model for ALC269 and friends	2013-10-11 10:23:49 +02:00
spi	spi/documentation: Fix usage of __initdata	2013-08-20 12:52:28 +02:00
sysctl	coredump: add new %P variable in core_pattern	2013-09-11 15:59:01 -07:00
target	Documentation: replace strict_strtoul() with kstrtoul()	2013-08-20 12:56:26 +02:00
thermal	thermal: thermal_core: allow binding with limits on bind_params	2013-09-03 09:10:24 -04:00
timers	nohz_full: Add testing information to documentation	2013-08-18 18:06:55 -07:00
tpm	drivers/tpm: add xen tpmfront interface	2013-08-09 10:57:06 -04:00
trace	Documentation/trace: Correcting and extending tracepoint documentation	2013-08-27 10:57:11 +02:00
usb	proc_usb_info.txt: Correct documentation about endianness of config descriptors	2013-08-12 12:24:27 -07:00
vDSO
video4linux	[media] V4L: Add support for integer menu controls with standard menu items	2013-08-18 07:12:59 -03:00
virtual	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2013-09-06 09:36:28 -07:00
vm	mm: track vma changes with VM_SOFTDIRTY bit	2013-09-11 15:57:56 -07:00
w1	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2013-07-04 11:40:58 -07:00
watchdog	watchdog: delete mpcore_wdt driver	2013-07-11 21:47:58 +02:00
wimax
x86	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2013-09-06 09:36:28 -07:00
xtensa	xtensa: document MMUv3 setup sequence	2013-05-09 01:07:09 -07:00
zh_CN	Documentation/zh_CN/SubmittingPatches fix a typo	2013-08-20 12:41:25 +02:00
.gitignore
00-INDEX	doc: fix a typo in Documentation/00-INDEX	2013-08-27 10:53:07 +02:00
applying-patches.txt
atomic_ops.txt
bad_memory.txt
basic_profiling.txt
bcache.txt	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2013-07-04 11:40:58 -07:00
binfmt_misc.txt
braille-console.txt
bt8xxgpio.txt
btmrvl.txt
BUG-HUNTING
bus-virt-phys-mapping.txt
cachetlb.txt	Documentation: fix typo and update version in cachetlb.txt	2013-08-20 12:46:52 +02:00
Changes
circular-buffers.txt
clk.txt	clk: add support for clock reparent on set_rate	2013-08-19 12:27:17 -07:00
coccinelle.txt	Coccinelle: Update information about the minimal version required	2013-07-03 22:58:20 +02:00
CodingStyle	Documentation/CodingStyle: allow multiple return statements per function	2013-07-03 16:08:01 -07:00
cpu-hotplug.txt	kernel: delete __cpuinit usage from all core kernel files	2013-07-14 19:36:59 -04:00
cpu-load.txt
cputopology.txt	doc: Documentation/cputopology.txt fix typo	2013-09-04 12:59:47 +02:00
crc32.txt
dcdbas.txt
debugging-modules.txt
debugging-via-ohci1394.txt
dell_rbu.txt
devices.txt	/dev/oldmem: Remove the interface	2013-07-03 16:08:03 -07:00
digsig.txt
DMA-API-HOWTO.txt
DMA-API.txt
DMA-attributes.txt
dma-buf-sharing.txt	dma-buf: Expose buffer size to userspace (v2)	2013-09-10 11:36:45 +05:30
DMA-ISA-LPC.txt
dmaengine.txt
dmatest.txt	dmatest: make module parameters writable	2013-08-22 22:57:32 -07:00
dontdiff
dynamic-debug-howto.txt	doc: fix misspellings with 'codespell' tool	2013-05-28 12:02:12 +02:00
edac.txt
eisa.txt
email-clients.txt
flexible-arrays.txt
futex-requeue-pi.txt
gcov.txt
gpio.txt	Remove GENERIC_GPIO config option	2013-04-16 18:47:19 +09:00
highuid.txt
HOWTO	Documentation: Updated broken link in HOWTO	2013-06-03 14:22:57 -07:00
hw_random.txt
hwspinlock.txt	doc: documentation/hwspinlock.txt fix typo	2013-08-27 10:46:02 +02:00
init.txt
initrd.txt
intel_txt.txt
Intel-IOMMU.txt
io_ordering.txt
io-mapping.txt
iostats.txt	iostats.txt: add easy-to-find description for field 6	2013-04-29 15:18:50 +02:00
IPMI.txt
IRQ-affinity.txt	doc: fix a typo about irq affinity	2013-08-20 12:59:18 +02:00
IRQ-domain.txt
IRQ.txt
irqflags-tracing.txt
isapnp.txt
java.txt
kernel-doc-nano-HOWTO.txt	kernel-doc: Update references to SGML to refs to XML instead.	2013-05-28 12:02:11 +02:00
kernel-docs.txt
kernel-parameters.txt	block: change config option name for cmdline partition parsing	2013-09-30 14:31:02 -07:00
kernel-per-CPU-kthreads.txt	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2013-07-04 11:40:58 -07:00
kmemcheck.txt	Documentation/kmemcheck: update kmemcheck documentation	2013-08-27 10:47:05 +02:00
kmemleak.txt
kobject.txt
kprobes.txt
kref.txt
ldm.txt
local_ops.txt
lockdep-design.txt
lockstat.txt
lockup-watchdogs.txt
logo.gif
logo.txt
magic-number.txt
Makefile
ManagementStyle
md.txt	md: remove doubled description for sync_max, merging it within sync_min/sync_max	2013-07-03 09:43:28 +10:00
media-framework.txt	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media	2013-07-13 12:09:57 -07:00
memory-barriers.txt	doc: Fix memory-barrier control-dependency example	2013-08-19 21:39:42 -07:00
memory-hotplug.txt	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2013-09-06 09:36:28 -07:00
mono.txt
mutex-design.txt
nommu-mmap.txt
numastat.txt
oops-tracing.txt
padata.txt
parport-lowlevel.txt
parport.txt
percpu-rw-semaphore.txt
pi-futex.txt
pinctrl.txt	Documentation: pinctrl: Fix example code for pinctrl_register	2013-08-23 08:56:28 +02:00
pnp.txt
preempt-locking.txt
printk-formats.txt	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2013-09-06 09:36:28 -07:00
pwm.txt	pwm: Add sysfs interface	2013-06-21 11:32:51 +02:00
ramoops.txt
rbtree.txt
remoteproc.txt
rfkill.txt
robust-futex-ABI.txt
robust-futexes.txt
rpmsg.txt
rt-mutex-design.txt	sched: Rename sched.c as sched/core.c in comments and Documentation	2013-06-19 12:58:42 +02:00
rt-mutex.txt
rtc.txt	rtc: add ability to push out an existing wakealarm using sysfs	2013-07-03 16:07:54 -07:00
SAK.txt
SecurityBugs
serial-console.txt
sgi-ioc4.txt
sgi-visws.txt
SM501.txt
smsc_ece1099.txt
sparse.txt
spinlocks.txt	sched: Rename sched.c as sched/core.c in comments and Documentation	2013-06-19 12:58:42 +02:00
stable_api_nonsense.txt
stable_kernel_rules.txt
static-keys.txt
SubmitChecklist	Finally eradicate CONFIG_HOTPLUG	2013-06-03 14:20:18 -07:00
SubmittingDrivers
SubmittingPatches	Documentation/SubmittingPatches: Request summaries for commit references	2013-08-20 12:58:15 +02:00
svga.txt
sysfs-rules.txt	doc: Fix typo in doucmentations	2013-07-25 12:34:15 +02:00
sysrq.txt	Documentation/sysrq: fix inconstistent help message of sysrq key	2013-04-30 17:04:10 -07:00
this_cpu_ops.txt	percpu: add documentation on this_cpu operations	2013-04-04 10:24:53 -07:00
unaligned-memory-access.txt
unicode.txt
unshare.txt
vfio.txt	vfio: fix documentation	2013-09-05 16:36:21 -06:00
VGA-softcursor.txt
vgaarbiter.txt
video-output.txt
vme_api.txt
volatile-considered-harmful.txt
workqueue.txt	workqueue: Correct/Drop references to gcwq in Documentation	2013-08-21 10:32:09 -04:00
ww-mutex-design.txt	mutex: Add support for wound/wait style locks	2013-06-26 12:10:56 +02:00
xz.txt
zorro.txt