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linux/drivers
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Minchan Kim 2e32baea46 zram: revalidate disk after capacity change 
Alexander reported mkswap on /dev/zram0 is failed if other process is
opening the block device file.

Step is as follows,

0. Reset the unused zram device.
1. Use a program that opens /dev/zram0 with O_RDWR and sleeps
   until killed.
2. While that program sleeps, echo the correct value to
   /sys/block/zram0/disksize.
3. Verify (e.g. in /proc/partitions) that the disk size is applied
   correctly. It is.
4. While that program still sleeps, attempt to mkswap /dev/zram0.
   This fails: mkswap: error: swap area needs to be at least 40 KiB

When I investigated, the size get by ioctl(fd, BLKGETSIZE64, xxx) on
mkswap to get a size of blockdev was zero although zram0 has right size by
2.

The reason is zram didn't revalidate disk after changing capacity so that
size of blockdev's inode is not uptodate until all of file is close.

This patch should fix the BUG.

Signed-off-by: Minchan Kim <minchan@kernel.org>
Reported-by: Alexander E. Patrakov <patrakov@gmail.com>
Tested-by: Alexander E. Patrakov <patrakov@gmail.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Nitin Gupta <ngupta@vflare.org>
Acked-by: Jerome Marchand <jmarchan@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-07-03 09:21:53 -07:00
..
accessibility
acpi Merge branches 'acpi-general', 'acpi-processor', 'acpi-lpss' and 'acpi-battery' 2014-06-19 14:40:48 +02:00
amba
ata Merge branch 'for-3.16' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2014-06-09 14:58:36 -07:00
atm atm: fore200e.c: Cleaning up uninitialized variables 2014-06-02 17:11:03 -07:00
auxdisplay
base DMA, CMA: fix possible memory leak 2014-06-23 16:47:44 -07:00
bcma
block zram: revalidate disk after capacity change 2014-07-03 09:21:53 -07:00
bluetooth Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-06-12 14:27:40 -07:00
bus bus/arm-cci: add dependency on OF && CPU_V7 2014-06-17 17:09:35 +02:00
cdrom Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2014-06-11 08:41:17 -07:00
char random: fix entropy accounting bug introduced in v3.15 2014-06-17 14:23:14 -10:00
clk This pull request contains the second half the of the clk changes for 2014-06-15 16:02:20 -10:00
clocksource clocksource: exynos_mct: Don't reset the counter during boot and resume 2014-06-17 00:23:29 +09:00
connector Char / misc driver patches for 3.16-rc1 2014-06-03 08:06:56 -07:00
cpufreq cpufreq: unlock when failing cpufreq_update_policy() 2014-06-18 21:52:20 +02:00
cpuidle cpuidle: mvebu: Fix the name of the states 2014-06-18 21:54:46 +02:00
crypto crypto/nx: disable NX on little endian builds 2014-06-11 17:03:19 +10:00
dca
devfreq
dio
dma Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2014-06-10 10:28:45 -07:00
edac PCI changes for the v3.16 merge window: 2014-06-02 12:15:19 -07:00
eisa
extcon
firewire sound updates for 3.16-rc1 2014-06-04 09:08:25 -07:00
firmware efi-pstore: Fix an overflow on 32-bit builds 2014-06-27 07:30:32 +01:00
fmc
gpio gpio: of: Fix handling for deferred probe for -gpio suffix 2014-06-12 09:57:00 +02:00
gpu Merge tag 'drm-intel-fixes-2014-06-26' of git://anongit.freedesktop.org/drm-intel into drm-fixes 2014-06-27 15:04:06 +10:00
hid Most of this is cleaning up various driver sysfs permissions so we can 2014-06-11 16:09:14 -07:00
hsi hsi: omap_ssi_port: use normal module refcounting 2014-06-05 00:59:05 +02:00
hv Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-06-12 14:27:40 -07:00
hwmon hwmon: (gpio-fan) Change name used in hwmon_device_register_with_groups 2014-06-25 15:16:09 -07:00
hwspinlock
i2c i2c: sun6-p2wi: fix call to snprintf 2014-06-17 14:28:04 +02:00
ide
idle
iio First set of IIO fixes for the 3.16 cycle. 2014-06-18 10:41:08 -07:00
infiniband Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2014-06-12 22:38:32 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2014-06-09 18:46:02 -07:00
iommu iommu/amd: Fix small race between invalidate_range_end/start 2014-06-20 16:14:22 +02:00
ipack
irqchip Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next 2014-06-04 15:59:13 -07:00
isdn isdn: hisax: Drop duplicate Kconfig entry 2014-06-16 21:31:37 -07:00
leds Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds 2014-06-12 13:08:09 -07:00
lguest
macintosh powerpc/macintosh/smu.c: Fix closing brace followed by if 2014-06-24 12:43:15 +10:00
mailbox
mcb
md . Add dm_accept_partial_bio interface to DM core to allow DM targets 2014-06-12 13:33:29 -07:00
media Merge branch 'topic/omap3isp' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2014-06-12 23:04:28 -07:00
memory
memstick drivers/memstick/host/rtsx_pci_ms.c: add cancel_work when remove driver 2014-06-23 16:47:44 -07:00
message
mfd mfd: ab8500: Fix dt irq mapping 2014-06-26 13:34:15 +01:00
misc ARM: SoC fixes for 3.16 2014-06-25 12:19:01 -07:00
mmc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-06-12 14:27:40 -07:00
mtd Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-06-12 10:30:18 -07:00
net net: allwinner: emac: Add missing free_irq 2014-06-25 16:31:17 -07:00
nfc
ntb
nubus kernel/printk: use symbolic defines for console loglevels 2014-06-04 16:54:17 -07:00
of Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-06-25 21:08:24 -07:00
oprofile
parisc
parport parport: convert use of typedef ctl_table to struct ctl_table 2014-06-06 16:08:15 -07:00
pci PCI changes for the v3.16 merge window (part 2): 2014-06-12 13:20:24 -07:00
pcmcia
phy
pinctrl This is the bulk of pin control changes for the v3.16 2014-06-03 11:20:32 -07:00
platform Merge branch 'for_linus' of git://cavan.codon.org.uk/platform-drivers-x86 2014-06-10 16:58:32 -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
pps
ps3
ptp ptp: ptp_pch depends on x86_32 2014-06-17 15:43:48 -07:00
pwm pwm: Changes for v3.16-rc1 2014-06-11 14:06:55 -07:00
rapidio rapidio/tsi721: use pci_enable_msix_exact() instead of pci_enable_msix() 2014-06-06 16:08:13 -07:00
regulator Merge remote-tracking branches 'regulator/fix/bcm590xx', 'regulator/fix/palmas' and 'regulator/fix/tps65218' into regulator-linus 2014-06-28 14:01:04 +01:00
remoteproc remoteproc: da8xx: don't select CMA on no-MMU 2014-06-17 17:09:36 +02:00
reset ARM: SoC driver changes 2014-06-02 16:35:49 -07:00
rpmsg
rtc drivers/rtc/rtc-puv3.c: remove "&dev->" for typo issue MIME-Version: 1.0 2014-06-20 08:22:39 +08:00
s390 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2014-06-21 06:47:01 -10:00
sbus
scsi drivers: scsi: mvsas: fix compiling issue by adding 'MVS_' for "enum pci_interrupt_cause" 2014-06-20 08:22:39 +08:00
sfi
sh SH Driver Update for v3.16 2014-06-06 11:44:09 -07:00
sn
soc
spi Merge remote-tracking branches 'spi/fix/pxa2xx', 'spi/fix/qup' and 'spi/fix/sh-sci' into spi-linus 2014-06-28 14:01:23 +01:00
spmi
ssb
staging imx-drm: parallel-display: Fix DPMS default state. 2014-06-19 17:33:37 -07:00
target iscsi-target: fix iscsit_del_np deadlock on unload 2014-06-27 23:23:35 -07:00
tc TC: Handle device_register() errors. 2014-06-26 10:48:23 +01:00
thermal Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux 2014-06-11 14:26:21 -07:00
tty ARM: SoC fixes for 3.16 2014-06-25 12:19:01 -07:00
uio Revert "uio: fix vma io range check in mmap" 2014-06-17 16:07:08 -07:00
usb USB: usbtest: add a timeout for scatter-gather tests 2014-06-17 17:05:50 -07:00
uwb
vfio A handful of VFIO bug fixes for v3.16 2014-06-07 20:12:15 -07:00
vhost vhost-scsi: don't open-code kvfree 2014-06-23 09:22:48 +03:00
video fb: adv7393: add missing semicolon 2014-07-01 13:18:38 +03:00
virt
virtio
vlynq
vme
w1 w1: mxc_w1: Fix incorrect "presence" status 2014-06-19 17:51:46 -07:00
watchdog Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2014-06-21 06:47:01 -10:00
xen xen: regression and PVH fixes for 3.16-rc1 2014-06-19 07:53:27 -10:00
zorro
Kconfig
Makefile Char / misc driver patches for 3.16-rc1 2014-06-03 08:06:56 -07:00