linux.git/fs/sysfs, branch v2.6.22-rc4

Detach sched.h from mm.h

2007-05-21T16:18:19+00:00

First thing mm.h does is including sched.h solely for can_do_mlock() inline
function which has "current" dereference inside. By dealing with can_do_mlock()
mm.h can be detached from sched.h which is good. See below, why.

This patch
a) removes unconditional inclusion of sched.h from mm.h
b) makes can_do_mlock() normal function in mm/mlock.c
c) exports can_do_mlock() to not break compilation
d) adds sched.h inclusions back to files that were getting it indirectly.
e) adds less bloated headers to some files (asm/signal.h, jiffies.h) that were
   getting them indirectly

Net result is:
a) mm.h users would get less code to open, read, preprocess, parse, ... if
   they don't need sched.h
b) sched.h stops being dependency for significant number of files:
   on x86_64 allmodconfig touching sched.h results in recompile of 4083 files,
   after patch it's only 3744 (-8.3%).

Cross-compile tested on

	all arm defconfigs, all mips defconfigs, all powerpc defconfigs,
	alpha alpha-up
	arm
	i386 i386-up i386-defconfig i386-allnoconfig
	ia64 ia64-up
	m68k
	mips
	parisc parisc-up
	powerpc powerpc-up
	s390 s390-up
	sparc sparc-up
	sparc64 sparc64-up
	um-x86_64
	x86_64 x86_64-up x86_64-defconfig x86_64-allnoconfig

as well as my two usual configs.

Signed-off-by: Alexey Dobriyan 
Signed-off-by: Linus Torvalds

use simple_read_from_buffer() in fs/

2007-05-09T19:30:49+00:00

Cleanup using simple_read_from_buffer() in binfmt_misc, configfs, and sysfs.

Cc: Greg Kroah-Hartman 
Cc: Joel Becker 
Signed-off-by: Akinobu Mita 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

remove "struct subsystem" as it is no longer needed

2007-05-03T01:57:59+00:00

We need to work on cleaning up the relationship between kobjects, ksets and
ktypes.  The removal of 'struct subsystem' is the first step of this,
especially as it is not really needed at all.

Thanks to Kay for fixing the bugs in this patch.

Signed-off-by: Greg Kroah-Hartman

sysfs: printk format warning

2007-05-03T01:57:59+00:00

Fix sysfs printk format warning:
fs/sysfs/bin.c:62: warning: format '%d' expects type 'int', but argument 4 has type 'size_t'

Signed-off-by: Randy Dunlap 
Signed-off-by: Greg Kroah-Hartman

security: prevent permission checking of file removal via sysfs_remove_group()

2007-04-27T17:57:33+00:00

Prevent permission checking from being performed when the kernel wants to
unconditionally remove a sysfs group, by introducing an kernel-only variant
of lookup_one_len(), lookup_one_len_kern().

Additionally, as sysfs_remove_group() does not check the return value of
the lookup before using it, a BUG_ON has been added to pinpoint the cause
of any problems potentially caused by this (and as a form of annotation).

Signed-off-by: James Morris 
Cc: Nagendra Singh Tomar 
Cc: Tejun Heo 
Cc: Stephen Smalley 
Cc: Eric Paris 
Signed-off-by: Andrew Morton 
Signed-off-by: Greg Kroah-Hartman

device_schedule_callback() needs a module reference

2007-04-27T17:57:32+00:00

This patch (as896b) fixes an oversight in the design of
device_schedule_callback().  It is necessary to acquire a reference to the
module owning the callback routine, to prevent the module from being
unloaded before the callback can run.

Signed-off-by: Alan Stern 
Cc: Satyam Sharma 
Cc: Neil Brown 
Cc: Cornelia Huck 
Signed-off-by: Andrew Morton 
Signed-off-by: Greg Kroah-Hartman

sysfs: bin.c printk fix

2007-04-27T17:57:32+00:00

fs/sysfs/bin.c: In function 'read':
fs/sysfs/bin.c:77: warning: format '%zd' expects type 'signed size_t', but argument 4 has type 'int'



Signed-off-by: Andrew Morton 
Signed-off-by: Greg Kroah-Hartman

[PATCH] sysfs: reinstate exclusion between method calls and attribute unregistration

2007-03-15T22:29:26+00:00

This patch (as869) reinstates the mutual exclusion between sysfs
attribute method calls and attribute unregistration.  The
previously-reported deadlocks have been fixed, and this exclusion is
by far the simplest way to avoid races during driver unbinding.

The check for orphaned read-buffers has been moved down slightly, so
that the remainder of a partially-read buffer will still be available
to userspace even after the attribute has been unregistered.

Signed-off-by: Alan Stern 
Cc: Hugh Dickins 
Cc: Cornelia Huck 
Cc: Oliver Neukum 
Signed-off-by: Linus Torvalds

[PATCH] sysfs and driver core: add callback helper, used by SCSI and S390

2007-03-15T22:29:26+00:00

This patch (as868) adds a helper routine for device drivers that need
to set up a callback to perform some action in a different process's
context.  This is intended for use by attribute methods that want to
unregister themselves or their parent device.  Attribute method calls
are mutually exclusive with unregistration, so such actions cannot be
taken directly.

Two attribute methods are converted to use the new helper routine: one
for SCSI device deletion and one for System/390 ccwgroup devices.

Signed-off-by: Alan Stern 
Cc: Hugh Dickins 
Cc: Cornelia Huck 
Cc: Oliver Neukum 
Signed-off-by: Linus Torvalds

[PATCH] suspend regression: sysfs deadlock

2007-03-07T01:59:14+00:00

Suspend deadlocks when trying to unregister /sys/block/sr0.

This comes from Oliver's commit 94bebf4d1b8e7719f0f3944c037a21cfd99a4af7
"Driver core: fix race in sysfs between sysfs_remove_file() and
read()/write()".

sysfs_write_file downs buffer->sem while calling flush_write_buffer, and
flushing that particular write buffer entails downing buffer->sem in
orphan_all_buffers, resulting in the obvious self-deadlock.

Signed-off-by: Linus Torvalds