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Joonsoo Kim f4659d8e62 zram: support REQ_DISCARD 
zram is ram based block device and can be used by backend of filesystem.
When filesystem deletes a file, it normally doesn't do anything on data
block of that file.  It just marks on metadata of that file.  This
behavior has no problem on disk based block device, but has problems on
ram based block device, since we can't free memory used for data block.
To overcome this disadvantage, there is REQ_DISCARD functionality.  If
block device support REQ_DISCARD and filesystem is mounted with discard
option, filesystem sends REQ_DISCARD to block device whenever some data
blocks are discarded.  All we have to do is to handle this request.

This patch implements to flag up QUEUE_FLAG_DISCARD and handle this
REQ_DISCARD request.  With it, we can free memory used by zram if it isn't
used.

[akpm@linux-foundation.org: tweak comments]
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Jerome Marchand <jmarchan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2014-04-07 16:36:02 -07:00
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accessibility
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acpi More ACPI and power management updates for 3.15-rc1 2014-04-02 14:10:21 -07:00
amba ARM: SoC: driver changes 2014-04-05 15:37:40 -07:00
ata Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2014-04-02 16:23:38 -07:00
atm
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auxdisplay
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base Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2014-04-02 16:23:38 -07:00
bcma
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block zram: support REQ_DISCARD 2014-04-07 16:36:02 -07:00
bluetooth Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-04-02 20:53:45 -07:00
bus ARM: SoC: driver changes 2014-04-05 15:37:40 -07:00
cdrom
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char ARM: SoC: driver changes 2014-04-05 15:37:40 -07:00
clk The clock framework changes for 3.15 look similar to past pull requests. 2014-04-05 18:39:18 -07:00
clocksource ARM: SoC: cleanups for 3.15 2014-04-05 13:51:19 -07:00
connector Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-04-02 20:53:45 -07:00
cpufreq ARM: SoC: driver changes 2014-04-05 15:37:40 -07:00
cpuidle ARM: SoC: driver changes 2014-04-05 15:37:40 -07:00
crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2014-04-03 09:28:16 -07:00
dca
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devfreq
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dio
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dma Merge branch 'devel-stable' into for-next 2014-04-04 00:33:49 +01:00
edac Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2014-04-04 09:50:07 -07:00
eisa
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extcon
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firewire
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firmware Driver core / sysfs patches for 3.15-rc1 2014-04-01 16:28:19 -07:00
fmc
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gpio ARM: SoC: driver changes 2014-04-05 15:37:40 -07:00
gpu ARM: SoC: driver changes 2014-04-05 15:37:40 -07:00
hid Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2014-04-04 09:50:07 -07:00
hsi
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hv
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hwmon Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging 2014-04-05 18:45:11 -07:00
hwspinlock
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i2c
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ide
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idle
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iio Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2014-04-02 16:24:28 -07:00
infiniband Main batch of InfiniBand/RDMA changes for 3.15: 2014-04-03 16:57:19 -07:00
input pwm: Changes for v3.15-rc1 2014-04-05 18:32:31 -07:00
iommu IOMMU Upates for Linux v3.15 2014-04-05 18:46:26 -07:00
ipack
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irqchip ARM: SoC: driver changes 2014-04-05 15:37:40 -07:00
isdn
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leds
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lguest drivers/lguest/page_tables.c: rename do_set_pte() 2014-04-07 16:35:52 -07:00
macintosh
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mailbox
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mcb
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md . Fix dm-cache corruption caused by discard_block_size > 2014-04-05 18:49:31 -07:00
media Merge branch 'topic/exynos' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2014-04-05 13:10:00 -07:00
memory
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memstick
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message
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mfd ARM: SoC: device tree changes 2014-04-05 15:29:04 -07:00
misc Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2014-04-02 16:23:38 -07:00
mmc Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 2014-04-05 13:20:43 -07:00
mtd ARM: SoC: driver changes 2014-04-05 15:37:40 -07:00
net Main batch of InfiniBand/RDMA changes for 3.15: 2014-04-03 16:57:19 -07:00
nfc
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ntb
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nubus
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of Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2014-04-04 09:50:07 -07:00
oprofile
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parisc
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parport
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pci Nothing major: the stricter permissions checking for sysfs broke 2014-04-06 09:38:07 -07:00
pcmcia
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phy ARM: SoC: driver changes 2014-04-05 15:37:40 -07:00
pinctrl This is the bulk of GPIO changes for v3.15: 2014-04-03 16:44:15 -07:00
platform
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pnp More ACPI and power management updates for 3.15-rc1 2014-04-02 14:10:21 -07:00
power
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powercap
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pps
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ps3
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ptp
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pwm pwm: Changes for v3.15-rc1 2014-04-05 18:32:31 -07:00
rapidio
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regulator Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2014-04-02 16:23:38 -07:00
remoteproc
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reset
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rpmsg
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rtc ARM: SoC: driver changes 2014-04-05 15:37:40 -07:00
s390 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-04-02 20:53:45 -07:00
sbus
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scsi Main batch of InfiniBand/RDMA changes for 3.15: 2014-04-03 16:57:19 -07:00
sfi
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sh ARM: SoC: sh driver changes 2014-04-05 15:38:41 -07:00
sn
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spi Merge branch 'mips-for-linux-next' of git://git.linux-mips.org/pub/scm/ralf/upstream-sfr 2014-04-02 13:40:50 -07:00
spmi
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ssb
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staging Nothing major: the stricter permissions checking for sysfs broke 2014-04-06 09:38:07 -07:00
target
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tc
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thermal ARM: SoC: driver changes 2014-04-05 15:37:40 -07:00
tty ARM: SoC: driver changes 2014-04-05 15:37:40 -07:00
uio
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usb Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 2014-04-05 13:20:43 -07:00
uwb
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vfio VFIO updates for v3.15 include: 2014-04-03 14:05:02 -07:00
vhost
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video fbdev changes for 3.15 (main part) 2014-04-04 21:28:36 -07:00
virt
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virtio
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vlynq
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vme
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w1
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watchdog ARM: SoC: driver changes 2014-04-05 15:37:40 -07:00
xen Support PCI devices with multiple MSIs, performance improvement for 2014-04-03 14:01:37 -07:00
zorro
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Kconfig
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Makefile
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