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Weijie Yang 38515c7339 zram: correct offset usage in zram_bio_discard 
We want to skip the physical block(PAGE_SIZE) which is partially covered
by the discard bio, so we check the remaining size and subtract it if
there is a need to goto the next physical block.

The current offset usage in zram_bio_discard is incorrect, it will cause
its upper filesystem breakdown.  Consider the following scenario:

On some architecture or config, PAGE_SIZE is 64K for example, filesystem
is set up on zram disk without PAGE_SIZE aligned, a discard bio leads to a
offset = 4K and size=72K, normally, it should not really discard any
physical block as it partially cover two physical blocks.  However, with
the current offset usage, it will discard the second physical block and
free its memory, which will cause filesystem breakdown.

This patch corrects the offset usage in zram_bio_discard.

Signed-off-by: Weijie Yang <weijie.yang@samsung.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Acked-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Bob Liu <bob.liu@oracle.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2014-06-04 16:54:13 -07:00
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accessibility
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acpi ACPI and power management updates for 3.16-rc1 2014-06-04 08:57:16 -07:00
amba
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ata Merge branch 'for-3.15-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2014-05-21 18:35:42 +09:00
atm
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auxdisplay
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base cma: increase CMA_ALIGNMENT upper limit to 12 2014-06-04 16:54:08 -07:00
bcma
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block zram: correct offset usage in zram_bio_discard 2014-06-04 16:54:13 -07:00
bluetooth TTY/Serial driver patches for 3.16-rc1 2014-06-03 09:01:02 -07:00
bus ARM: SoC driver changes 2014-06-02 16:35:49 -07:00
cdrom
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char ACPI and power management updates for 3.16-rc1 2014-06-04 08:57:16 -07:00
clk DeviceTree for 3.16: 2014-06-04 10:02:38 -07:00
clocksource DeviceTree for 3.16: 2014-06-04 10:02:38 -07:00
connector Char / misc driver patches for 3.16-rc1 2014-06-03 08:06:56 -07:00
cpufreq ACPI and power management updates for 3.16-rc1 2014-06-04 08:57:16 -07:00
cpuidle ACPI and power management updates for 3.16-rc1 2014-06-04 08:57:16 -07:00
crypto crypto/nx/nx-842: dev_set_drvdata can no longer fail 2014-05-28 13:39:51 -07:00
dca
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devfreq PM / devfreq: remove checks for CONFIG_EXYNOS_ASV 2014-05-24 22:33:51 +09:00
dio
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dma ARM: SoC driver changes 2014-06-02 16:35:49 -07:00
edac PCI changes for the v3.16 merge window: 2014-06-02 12:15:19 -07:00
eisa
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extcon
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firewire sound updates for 3.16-rc1 2014-06-04 09:08:25 -07:00
firmware
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fmc
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gpio This is the bulk of GPIO changes for the v3.16 series: 2014-06-02 08:46:03 -07:00
gpu drm/exynos: call find_vma with the mmap_sem held 2014-06-04 16:54:00 -07:00
hid Merge branches 'for-3.16/i2c-hid', 'for-3.16/rmi4', 'for-3.16/sony' and 'for-3.16/thingm' into for-linus 2014-06-04 13:09:43 +02:00
hsi
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hv hv: use correct order when freeing monitor_pages 2014-05-28 13:45:15 -07:00
hwmon New driver for NCT6683D 2014-06-03 11:09:43 -07:00
hwspinlock
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i2c
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ide
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idle
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iio Staging driver patches for 3.16-rc1 2014-06-03 08:34:00 -07:00
infiniband Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-05-23 15:29:43 -07:00
input ARM: SoC updates for 3.16 (part 1) 2014-06-02 16:15:12 -07:00
iommu intel-iommu: integrate DMA CMA 2014-06-04 16:53:57 -07:00
ipack
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irqchip DeviceTree for 3.16: 2014-06-04 10:02:38 -07:00
isdn
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leds Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid into next 2014-06-04 08:52:36 -07:00
lguest
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macintosh
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mailbox
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mcb mcb: Add support for shared PCI IRQs 2014-05-27 17:38:11 -07:00
md Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next 2014-06-03 12:57:53 -07:00
media Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next 2014-06-03 12:57:53 -07:00
memory
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memstick
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message
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mfd sound updates for 3.16-rc1 2014-06-04 09:08:25 -07:00
misc Merge branch 'x86-uv-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next 2014-06-03 15:48:23 -07:00
mmc Updates for mmci driver: 2014-06-02 09:22:24 -07:00
mtd Merge branch 'for-3.16/core' of git://git.kernel.dk/linux-block into next 2014-06-02 09:29:34 -07:00
net ACPI and power management updates for 3.16-rc1 2014-06-04 08:57:16 -07:00
nfc
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ntb
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nubus
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of DeviceTree for 3.16: 2014-06-04 10:02:38 -07:00
oprofile
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parisc
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parport parport: Add support for the WCH353 1S/1P multi-IO card 2014-05-28 12:30:48 -07:00
pci Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial into next 2014-06-04 08:50:34 -07:00
pcmcia pcmcia: Use pci_is_bridge() to simplify code 2014-05-27 14:58:24 -06:00
phy
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pinctrl This is the bulk of pin control changes for the v3.16 2014-06-03 11:20:32 -07:00
platform ACPI and power management updates for 3.16-rc1 2014-06-04 08:57:16 -07:00
pnp Merge branches 'pnp', 'powercap', 'pm-runtime' and 'pm-opp' 2014-06-03 23:13:00 +02:00
power ACPI and power management updates for 3.16-rc1 2014-06-04 08:57:16 -07:00
powercap
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pps
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ps3
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ptp
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pwm
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rapidio
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regulator regulator: Updates for v3.16 2014-06-03 11:44:48 -07:00
remoteproc
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reset ARM: SoC driver changes 2014-06-02 16:35:49 -07:00
rpmsg
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rtc
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s390 At over 200 commits, covering almost all supported architectures, this 2014-06-04 08:47:12 -07:00
sbus
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scsi Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial into next 2014-06-04 08:50:34 -07:00
sfi
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sh Merge back earlier cpufreq material. 2014-06-03 15:03:27 +02:00
sn
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soc soc: qcom: fix of_device_id table 2014-05-26 21:27:09 +02:00
spi Merge remote-tracking branch 'spi/topic/workqueue' into spi-next 2014-06-02 17:08:43 +01:00
spmi
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ssb
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staging Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial into next 2014-06-04 08:50:34 -07:00
target Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next 2014-06-03 12:57:53 -07:00
tc
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thermal
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tty DeviceTree for 3.16: 2014-06-04 10:02:38 -07:00
uio uio: fix vma io range check in mmap 2014-05-27 14:11:06 -07:00
usb Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next 2014-06-03 12:57:53 -07:00
uwb uwb: fix variable set but not used warnings 2014-05-27 15:18:48 -07:00
vfio driver core: dev_set_drvdata can no longer fail 2014-05-27 13:40:51 -07:00
vhost
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video fbdev changes for 3.16 (omap) 2014-06-04 09:07:08 -07:00
virt
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virtio
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vlynq
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vme
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w1 Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next 2014-06-03 12:57:53 -07:00
watchdog
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xen Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next 2014-06-03 12:57:53 -07:00
zorro
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Kconfig soc: Introduce drivers/soc place-holder for SOC specific drivers 2014-05-23 11:37:46 -05:00
Makefile Char / misc driver patches for 3.16-rc1 2014-06-03 08:06:56 -07:00