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19fa1a6756
linux/drivers
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Joe Thornber 19fa1a6756 dm thin: fix discard support to a previously shared block 
If a snapshot is created and later deleted the origin dm_thin_device's
snapshotted_time will have been updated to reflect the snapshot's
creation time.  The 'shared' flag in the dm_thin_lookup_result struct
returned from dm_thin_find_block() is an approximation based on
snapshotted_time -- this is done to avoid 0(n), or worse, time
complexity.  In this case, the shared flag would be true.

But because the 'shared' flag reflects an approximation a block can be
incorrectly assumed to be shared (e.g. false positive for 'shared'
because the snapshot no longer exists).  This could result in discards
issued to a thin device not being passed down to the pool's underlying
data device.

To fix this we double check that a thin block is really still in-use
after a mapping is removed using dm_pool_block_is_used().  If the
reference count for a block is now zero the discard is allowed to be
passed down.

Also add a 'definitely_not_shared' member to the dm_thin_new_mapping
structure -- reflects that the 'shared' flag in the response from
dm_thin_find_block() can only be held as definitive if false is
returned.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1043527

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
2014-01-07 10:11:43 -05:00
..
accessibility
acpi Merge branch 'acpica' 2013-11-27 01:03:27 +01:00
amba
ata SCSI fixes on 20131206 2013-12-06 08:30:18 -08:00
atm atm: idt77252: fix dev refcnt leak 2013-11-19 15:53:02 -05:00
auxdisplay
base Revert "cpufreq: suspend governors on system suspend/hibernate" 2013-12-08 01:04:17 +01:00
bcma
block null_blk: mem garbage on NUMA systems during init 2013-12-15 12:17:16 -08:00
bluetooth
bus
cdrom
char Char/Misc driver fixes for 3.13-rc3 2013-12-08 18:47:25 -08:00
clk Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2013-11-15 16:47:22 -08:00
clocksource clocksource: arm_arch_timer: Hide eventstream Kconfig on non-ARM 2013-11-21 00:06:52 +01:00
connector
cpufreq cpufreq_ at32ap-cpufreq.c: Fix section mismatch 2013-12-10 08:46:38 +01:00
cpuidle cpuidle: Check for dev before deregistering it. 2013-12-03 22:05:22 +01:00
crypto crypto: talitos - fix aead sglen for case 'dst != src' 2013-11-28 22:25:17 +08:00
dca
devfreq
dio
dma dma: fix build breakage in s3c24xx-dma 2013-12-04 11:24:30 +05:30
edac sb_edac: Shut up compiler warning when EDAC_DEBUG is enabled 2013-11-30 12:26:36 +01:00
eisa
extcon extcon: remove freed groups caused the panic or warning in unregister flow 2013-11-26 15:17:23 +09:00
firewire [SCSI] Disable WRITE SAME for RAID and virtual host adapter drivers 2013-11-29 08:48:39 +04:00
firmware efi-pstore: Make efi-pstore return a unique id 2013-11-29 10:11:06 +00:00
fmc
gpio A rather big fix for a regression where we have dropped omap4 hwmod 2013-12-09 15:38:41 -08:00
gpu radeon_pm: fix oops in hwmon_attributes_visible() and radeon_hwmon_show_temp_thresh() 2013-12-15 12:16:00 -08:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2013-12-13 13:21:28 -08:00
hsi
hv
hwmon hwmon fixes for 3.13-rc4 2013-12-12 11:05:19 -08:00
hwspinlock
i2c i2c: imx: Check the return value from clk_prepare_enable() 2013-12-12 22:48:22 +01:00
ide More ACPI and power management updates for 3.13-rc1 2013-11-20 13:25:04 -08:00
idle intel_idle: Fixed C6 state on Avoton/Rangeley processors 2013-11-28 14:35:26 +01:00
iio Fix build failure for gp2ap020a00f.c 2013-12-02 21:11:30 +00:00
infiniband Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2013-11-22 10:52:03 -08:00
input Input: adxl34x - Fix bug in definition of ADXL346_2D_ORIENT 2013-12-09 22:23:31 -08:00
iommu iommu/arm-smmu: fix error return code in arm_smmu_device_dt_probe() 2013-12-06 16:44:25 +00:00
ipack
irqchip Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-12-02 10:15:39 -08:00
isdn net: rework recvmsg handler msg_name and msg_namelen logic 2013-11-20 21:52:30 -05:00
leds leds: pwm: Fix for deferred probe in DT booted mode 2013-12-02 11:53:17 -08:00
lguest
macintosh powerpc/windfarm: Fix XServe G5 fan control Makefile issue 2013-11-27 11:35:47 +11:00
mailbox
md dm thin: fix discard support to a previously shared block 2014-01-07 10:11:43 -05:00
media [media] videobuf2-dma-sg: fix possible memory leak 2013-12-10 05:40:57 -02:00
memory
memstick
message
mfd mfd/rtc: s5m: fix register updating by adding regmap for RTC 2013-12-12 18:19:26 -08:00
misc Char/Misc driver fixes for 3.13-rc3 2013-12-08 18:47:25 -08:00
mmc mmc: omap: Fix I2C dependency and make driver usable with device tree 2013-11-26 15:51:16 -08:00
mtd mtd: nand: pxa3xx: Use info->use_dma to release DMA resources 2013-12-12 15:02:04 -08:00
net igb: Fix for issue where values could be too high for udelay function. 2013-12-14 22:59:42 -05:00
nfc
ntb NTB driver bug fixes to address a missed call to pci_enable_msix, 2013-11-26 11:15:12 -08:00
nubus
of
oprofile
parisc
parport
pci Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-12-15 11:56:47 -08:00
pcmcia
phy
pinctrl sh-pfc: sh7372: Fix pin bias setup 2013-12-03 10:38:41 +01:00
platform sony-laptop: do not scribble keyboard backlight registers on resume 2013-11-26 13:03:36 +09:00
pnp PNP: fix restoring devices after hibernation 2013-12-05 02:01:55 +01:00
power Highlights: 2013-11-18 15:35:09 -08:00
powercap PowerCap: Fix mode for energy counter 2013-12-05 02:05:48 +01:00
pps
ps3
ptp
pwm
rapidio
regulator regulator: Fixes for v3.13 2013-12-13 11:39:54 -08:00
remoteproc
reset
rpmsg
rtc mfd/rtc: s5m: fix register updating by adding regmap for RTC 2013-12-12 18:19:26 -08:00
s390 s390/sclp: replace uninitialized early_event_mask_sccb variable with sccb_early 2013-12-02 15:31:07 +01:00
sbus
scsi SCSI fixes on 20131206 2013-12-06 08:30:18 -08:00
sfi
sh
sn
spi Merge remote-tracking branches 'spi/fix/bcm2835', 'spi/fix/bcm63xx', 'spi/fix/mpc512x-psc', 'spi/fix/mxs', 'spi/fix/pxa2xx', 'spi/fix/qspi', 'spi/fix/rspi' and 'spi/fix/txx9' into spi-linus 2013-11-28 11:31:35 +00:00
ssb
staging Staging: TIDSPBRIDGE: Use vm_iomap_memory for mmap-ing instead of remap_pfn_range 2013-12-03 09:42:45 -08:00
target Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2013-11-22 10:52:03 -08:00
tc
thermal Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-11-19 15:50:47 -08:00
tty n_tty: Fix missing newline echo 2013-11-29 12:53:19 -08:00
uio uio: we cannot mmap unaligned page contents 2013-12-02 11:50:37 -08:00
usb usb: hub: Use correct reset for wedged USB3 devices that are NOTATTACHED 2013-12-04 17:00:43 -08:00
uwb
vfio
vhost Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2013-11-22 10:52:03 -08:00
video Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2013-12-09 19:21:39 -08:00
virt
virtio
vlynq
vme
w1
watchdog sc1200_wdt: Fix oops 2013-12-10 08:48:15 +01:00
xen Bug-fixes: 2013-12-02 10:12:01 -08:00
zorro
Kconfig
Makefile