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Vladimir Davydov 53d85c9856 cleancache: forbid overriding cleancache_ops 
Currently, cleancache_register_ops returns the previous value of
cleancache_ops to allow chaining.  However, chaining, as it is
implemented now, is extremely dangerous due to possible pool id
collisions.  Suppose, a new cleancache driver is registered after the
previous one assigned an id to a super block.  If the new driver assigns
the same id to another super block, which is perfectly possible, we will
have two different filesystems using the same id.  No matter if the new
driver implements chaining or not, we are likely to get data corruption
with such a configuration eventually.

This patch therefore disables the ability to override cleancache_ops
altogether as potentially dangerous.  If there is already cleancache
driver registered, all further calls to cleancache_register_ops will
return EBUSY.  Since no user of cleancache implements chaining, we only
need to make minor changes to the code outside the cleancache core.

Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: David Vrabel <david.vrabel@citrix.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Stefan Hengelein <ilendir@googlemail.com>
Cc: Florian Schmaus <fschmaus@gmail.com>
Cc: Andor Daam <andor.daam@googlemail.com>
Cc: Dan Magenheimer <dan.magenheimer@oracle.com>
Cc: Bob Liu <lliubbo@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2015-04-14 16:49:03 -07:00
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accessibility
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acpi ACPI / battery: Fix doubly added battery on system suspend 2015-04-14 09:03:33 -07:00
amba ARM: 8256/1: driver coamba: add device binding path 'driver_override' 2015-02-10 10:23:15 +00:00
android android: binder: fix binder mmap failures 2015-03-01 18:43:51 -08:00
ata Merge branch 'for-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2015-04-13 16:42:16 -07:00
atm
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auxdisplay
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base mm, hotplug: fix concurrent memory hot-add deadlock 2015-04-14 16:49:00 -07:00
bcma bcma: implement host code support for PCIe Gen 2 devices 2015-01-29 10:54:43 +02:00
block Merge branch 'linus' into irq/core to get the GIC updates which 2015-04-08 23:26:21 +02:00
bluetooth Bluetooth: btusb: Fix issue with CSR based Intel Wireless controllers 2015-02-23 09:30:35 +02:00
bus genirq: Remove the deprecated 'IRQF_DISABLED' request_irq() flag entirely 2015-03-05 20:53:06 +01:00
cdrom
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char ipmi_ssif: Use interruptible completion for waiting in the thread 2015-04-10 20:51:42 -05:00
clk The clk fixes for 4.0-rc4 comprise three themes. First are the usual 2015-03-15 15:07:08 -07:00
clocksource ARM, clocksource/drivers: Provide read_boot_clock64() and read_persistent_clock64() and use them 2015-04-03 08:18:23 +02:00
connector
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coresight coresight: fix function etm_writel_cp14() parameter order 2015-02-04 10:42:55 -08:00
cpufreq cpufreq: Schedule work for the first-online CPU on resume 2015-04-03 12:59:47 +02:00
cpuidle Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-04-13 11:08:28 -07:00
crypto Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2015-02-18 08:49:20 -08:00
dca
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devfreq Merge branches 'pm-cpufreq', 'pm-cpuidle', 'pm-devfreq', 'pm-opp' and 'pm-tools' 2015-02-13 21:39:06 +01:00
dio
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dma Staging driver patches for 4.1-rc1 2015-04-13 17:37:33 -07:00
dma-buf
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edac EDAC: Constify of_device_id array 2015-03-20 17:50:07 +01:00
eisa
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extcon extcon: max77693: Constify struct regmap_config 2015-01-26 13:47:55 +09:00
firewire firewire: core: use correct vendor/model IDs 2015-02-02 21:56:03 +01:00
firmware Merge branch 'core-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-04-13 10:22:30 -07:00
fmc
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gpio gpio: syscon: reduce message level when direction reg offset not in dt 2015-03-27 11:17:08 +01:00
gpu regulator: Updates for v4.1 2015-04-13 15:13:25 -07:00
hid power supply and reset changes for the v4.1 series 2015-04-13 15:21:34 -07:00
hsi HSI: cmt_speech: fix error return code 2015-04-05 14:45:27 +02:00
hv Char / Misc patches for 3.20-rc1 2015-02-15 10:48:44 -08:00
hwmon hwmon: (pwm-fan) Update the duty cycle inorder to control the pwm-fan 2015-04-12 15:59:11 -07:00
hwspinlock
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i2c Revert "i2c: core: Dispose OF IRQ mapping at client removal time" 2015-03-12 10:23:05 +01:00
ide Merge branch 'for-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2015-04-13 16:42:16 -07:00
idle intel_idle: Use explicit broadcast oneshot control function 2015-04-03 08:44:35 +02:00
iio Staging driver patches for 4.1-rc1 2015-04-13 17:37:33 -07:00
infiniband IB/uverbs: Prevent integer overflow in ib_umem_get address arithmetic 2015-04-02 09:53:59 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2015-04-06 14:10:08 -07:00
iommu PCI changes for the v4.1 merge window: 2015-04-13 15:45:47 -07:00
ipack
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irqchip irqchip core change for v4.1 (round 3) 2015-04-11 11:17:28 +02:00
isdn isdn: icn: use strlcpy() when parsing setup options 2015-03-15 22:24:37 -04:00
leds leds: leds-gpio: Pass on error codes unmodified 2015-02-02 14:36:10 -08:00
lguest lguest: now needs PCI_DIRECT. 2015-04-01 10:29:05 -07:00
macintosh
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mailbox Merge branch 'mailbox-devel' of git://git.linaro.org/landing-teams/working/fujitsu/integration 2015-02-11 12:56:40 -08:00
mcb mcb: Fix error path of mcb_pci_probe 2015-02-03 15:48:51 -08:00
md md/raid0: fix bug with chunksize not a power of 2. 2015-04-10 15:36:31 +10:00
media [media] rtl28xxu: return success for unimplemented FE callback 2015-04-02 18:27:14 -03:00
memory memory/fsl-corenet-cf: Add t1040 support 2015-01-29 22:57:43 -06:00
memstick
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message i2o: move to staging 2015-02-03 15:58:39 -08:00
mfd power supply and reset changes for the v4.1 series 2015-04-13 15:21:34 -07:00
misc Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-04-13 13:16:36 -07:00
mmc mmc: sdhci-st: Update the quirks for this controller. 2015-04-10 12:55:40 +02:00
mtd Merge branch 'linus' into irq/core to get the GIC updates which 2015-04-08 23:26:21 +02:00
net net/mlx4_core: Fix error message deprecation for ConnectX-2 cards 2015-04-06 17:32:27 -04:00
nfc NFC: nci: Move NFCEE discovery logic 2015-02-04 09:15:18 +01:00
ntb
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nubus
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of PCI changes for the v4.1 merge window: 2015-04-13 15:45:47 -07:00
oprofile
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parisc
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parport
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pci PCI changes for the v4.1 merge window: 2015-04-13 15:45:47 -07:00
pcmcia Revert "pcmcia: add a new resource manager for non ISA systems" 2015-03-11 14:21:23 +01:00
phy USB patches for 4.1-rc1 2015-04-13 17:07:21 -07:00
pinctrl pinctrl: sun4i: GPIOs configured as irq must be set to input before reading 2015-03-18 10:56:46 +01:00
platform power_supply: Change ownership from driver to core 2015-03-13 23:15:51 +01:00
pnp PNP: Don't check for overlaps with unassigned PCI BARs 2015-03-12 12:30:00 -05:00
power power: twl4030_madc_battery: Add missing MODULE_ALIAS 2015-04-06 19:39:57 +02:00
powercap powercap / RAPL: handle domains with different energy units 2015-03-13 23:18:44 +01:00
pps
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ps3
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ptp
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pwm pwm: tegra: Use NSEC_PER_SEC 2015-02-18 08:40:29 +01:00
rapidio Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2015-02-18 08:49:20 -08:00
ras
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regulator Merge remote-tracking branch 'regulator/topic/wm8350' into regulator-next 2015-04-10 19:16:06 +01:00
remoteproc
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reset
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rpmsg virtio_rpmsg: set DRIVER_OK before using device 2015-03-13 15:55:42 +10:30
rtc time, drivers/rtc: Don't bother with rtc_resume() for the nonstop clocksource 2015-04-03 08:18:34 +02:00
s390 s390/dcss: array index 'i' is used before limits check. 2015-02-26 09:24:48 +01:00
sbus
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scsi Merge branch 'for-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2015-04-13 16:42:16 -07:00
sfi
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sh drivers: sh: Disable PM runtime for multi-platform r8a7740 with genpd 2015-02-24 07:26:12 +09:00
sn
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soc ARM: SoC driver updates 2015-02-17 09:38:59 -08:00
spi Merge remote-tracking branches 'spi/topic/spidev' and 'spi/topic/spidev-test' into spi-next 2015-04-11 23:09:31 +01:00
spmi
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ssb treewide: Remove unnecessary SSB_DEVTABLE_END macro 2015-02-11 14:38:29 -08:00
staging page_writeback: clean up mess around cancel_dirty_page() 2015-04-14 16:49:01 -07:00
target iscsi target: fix oops when adding reject pdu 2015-04-10 12:33:55 -07:00
tc
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thermal drivers: thermal: st: remove several sparse warnings 2015-04-07 13:43:28 -07:00
thunderbolt
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tty Merge branch 'for-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq 2015-04-13 16:19:18 -07:00
uio
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usb USB patches for 4.1-rc1 2015-04-13 17:07:21 -07:00
uwb uwb: Remove umc bus legacy suspend/resume support 2015-03-18 17:27:03 +01:00
vfio vfio-pci: Add missing break to enable VFIO_PCI_ERR_IRQ_INDEX 2015-03-12 09:51:38 -06:00
vhost Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2015-03-21 11:24:38 -07:00
video OMAPDSS: fix regression with display sysfs files 2015-02-26 10:23:15 +02:00
virt
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virtio virtio_mmio: fix access width for mmio 2015-03-17 12:12:21 +10:30
vlynq
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vme vme: tsi148: Master windows support USERx and CR/CSR accesses, not slaves 2015-03-06 17:03:22 -08:00
w1
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watchdog watchdog: imgpdc: Fix default heartbeat 2015-03-27 08:47:50 +01:00
xen cleancache: forbid overriding cleancache_ops 2015-04-14 16:49:03 -07:00
zorro
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Kconfig i2o: move to staging 2015-02-03 15:58:39 -08:00
Makefile
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