Eric Sandeen c2d7543851 filesystem freeze: allow SysRq emergency thaw to thaw frozen filesystems ... Now that the filesystem freeze operation has been elevated to the VFS, and is just an ioctl away, some sort of safety net for unintentionally frozen root filesystems may be in order. The timeout thaw originally proposed did not get merged, but perhaps something like this would be useful in emergencies. For example, freeze /path/to/mountpoint may freeze your root filesystem if you forgot that you had that unmounted. I chose 'j' as the last remaining character other than 'h' which is sort of reserved for help (because help is generated on any unknown character). I've tested this on a non-root fs with multiple (nested) freezers, as well as on a system rendered unresponsive due to a frozen root fs. [randy.dunlap@oracle.com: emergency thaw only if CONFIG_BLOCK enabled] Signed-off-by: Eric Sandeen <sandeen@redhat.com> Cc: Takashi Sato <t-sato@yk.jp.nec.com> Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2009-04-01 08:59:17 -07:00
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accessibility
acpi	proc 2/2: remove struct proc_dir_entry::owner	2009-03-31 01:14:44 +04:00
amba	amba: struct device - replace bus_id with dev_name(), dev_set_name()	2009-03-24 16:38:22 -07:00
ata	Merge branch 'origin' into devel	2009-03-28 20:29:51 +00:00
atm
auxdisplay
base	Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-cpumask	2009-03-30 18:00:26 -07:00
block	loop: add ioctl to resize a loop device	2009-04-01 08:59:17 -07:00
bluetooth
cdrom
char	filesystem freeze: allow SysRq emergency thaw to thaw frozen filesystems	2009-04-01 08:59:17 -07:00
clocksource	Merge branch 'core/percpu' into percpu-cpumask-x86-for-linus-2	2009-03-27 17:28:43 +01:00
connector
cpufreq	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq	2009-03-26 11:04:08 -07:00
cpuidle
crypto	Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2009-03-26 11:04:34 -07:00
dca
dio	dio: struct device - replace bus_id with dev_name(), dev_set_name()	2009-03-24 16:38:22 -07:00
dma	Merge branch 'origin' into devel	2009-03-28 20:29:51 +00:00
edac	edac: struct device - replace bus_id with dev_name(), dev_set_name()	2009-03-24 16:38:21 -07:00
eisa	Merge branch 'core/percpu' into percpu-cpumask-x86-for-linus-2	2009-03-27 17:28:43 +01:00
firewire
firmware	dmi: Let dmi_walk() users pass private data	2009-03-30 21:46:44 +02:00
gpio	gpio: struct device - replace bus_id with dev_name(), dev_set_name()	2009-03-24 16:38:23 -07:00
gpu	drm: detect hdmi monitor by hdmi identifier (v3)	2009-03-29 18:31:49 +10:00
hid	Merge branch 'bkl-removal' of git://git.lwn.net/linux-2.6	2009-03-26 16:14:02 -07:00
hwmon	hwmon: (fschmd) Add support for the FSC Hades IC	2009-03-30 21:46:45 +02:00
i2c	Merge branch 'hwmon-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6	2009-03-30 17:54:32 -07:00
ide	ide: keep track of number of bytes instead of sectors in struct ide_cmd	2009-03-27 12:46:47 +01:00
idle
ieee1394	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6	2009-03-27 18:33:56 -07:00
infiniband	Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6	2009-03-28 13:30:43 -07:00
input	proc 2/2: remove struct proc_dir_entry::owner	2009-03-31 01:14:44 +04:00
isdn	proc tty: remove struct tty_operations::read_proc	2009-04-01 08:59:10 -07:00
leds
lguest	lguest: use bool instead of int	2009-03-30 21:55:25 +10:30
macintosh
mca	mca: struct device - replace bus_id with dev_name(), dev_set_name()	2009-03-24 16:38:23 -07:00
md
media	proc 2/2: remove struct proc_dir_entry::owner	2009-03-31 01:14:44 +04:00
memstick
message	proc 2/2: remove struct proc_dir_entry::owner	2009-03-31 01:14:44 +04:00
mfd	mfd: struct device - replace bus_id with dev_name(), dev_set_name()	2009-03-24 16:38:23 -07:00
misc	Merge branch 'i2c-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6	2009-03-28 14:04:53 -07:00
mmc	proc tty: switch sdio_uart to ->proc_fops	2009-04-01 08:59:09 -07:00
mtd	Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm	2009-03-28 14:03:14 -07:00
net	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6	2009-03-30 18:46:43 -07:00
nubus
of
oprofile	oprofile: Thou shalt not call __exit functions from __init functions	2009-03-30 22:05:18 +10:30
parisc
parport
pci	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6	2009-03-30 15:12:14 -07:00
pcmcia	Merge branch 'origin' into devel	2009-03-28 20:29:51 +00:00
platform	Merge branch 'hwmon-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6	2009-03-30 17:54:32 -07:00
pnp
power
ps3
rapidio	rapidio: struct device - replace bus_id with dev_name(), dev_set_name()	2009-03-24 16:38:21 -07:00
regulator
rtc	proc 2/2: remove struct proc_dir_entry::owner	2009-03-31 01:14:44 +04:00
s390	proc 2/2: remove struct proc_dir_entry::owner	2009-03-31 01:14:44 +04:00
sbus
scsi	proc 2/2: remove struct proc_dir_entry::owner	2009-03-31 01:14:44 +04:00
serial	proc tty: switch serial_core to ->proc_fops	2009-04-01 08:59:10 -07:00
sh	maple: fix Error in kernel-doc notation	2009-03-29 08:12:39 -07:00
sn
spi	Merge commit 'origin/master' into next	2009-03-30 14:04:53 +11:00
ssb	b43: Add BCM4307 PCI-ID	2009-03-27 20:13:20 -04:00
staging
tc	tc: struct device - replace bus_id with dev_name(), dev_set_name()	2009-03-24 16:38:22 -07:00
telephony
thermal
uio	UIO: Take offset into account when determining number of pages that can be mapped	2009-03-24 16:38:25 -07:00
usb	proc tty: switch usb-serial to ->proc_fops	2009-04-01 08:59:10 -07:00
uwb
video	mm: page_mkwrite change prototype to match fault	2009-04-01 08:59:14 -07:00
virtio	virtio: more neatening of virtio_ring macros.	2009-03-30 21:55:23 +10:30
w1	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap-2.6 into devel	2009-03-25 18:31:35 +00:00
watchdog	Merge branch 'hwmon-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6	2009-03-30 17:54:32 -07:00
xen	PM: Rework handling of interrupts during suspend-resume	2009-03-30 21:46:54 +02:00
zorro	zorro: struct device - replace bus_id with dev_name(), dev_set_name()	2009-03-24 16:38:21 -07:00
Kconfig
Makefile	ide/net: flip the order of SATA and network init	2009-03-28 13:06:16 -07:00