linux-toradex.git/Documentation/filesystems/sysfs.txt, branch v2.6.32.41

driver core: documentation: make it clear that sysfs is optional

2009-07-28T20:45:23+00:00

The original text suggested that sysfs is mandatory and always
compiled in the kernel.

Signed-off-by: Lucian Adrian Grijincu 
Signed-off-by: Randy Dunlap 
Signed-off-by: Greg Kroah-Hartman

PATCH [2/2] Documentation/filesystems/sysfs.txt: fix descriptions of device attributes

2009-02-22T17:28:15+00:00

Fix descriptions of device attributes to be consistent with the actual
implementations in include/linux/device.h

Signed-off-by: Mike Murphy 
Signed-off-by: Linus Torvalds

sysfs: add /sys/dev/{char,block} to lookup sysfs path by major:minor

2008-07-22T04:54:40+00:00

Why?:
There are occasions where userspace would like to access sysfs
attributes for a device but it may not know how sysfs has named the
device or the path.  For example what is the sysfs path for
/dev/disk/by-id/ata-ST3160827AS_5MT004CK?  With this change a call to
stat(2) returns the major:minor then userspace can see that
/sys/dev/block/8:32 links to /sys/block/sdc.

What are the alternatives?:
1/ Add an ioctl to return the path: Doable, but sysfs is meant to reduce
   the need to proliferate ioctl interfaces into the kernel, so this
   seems counter productive.

2/ Use udev to create these symlinks: Also doable, but it adds a
   udev dependency to utilities that might be running in a limited
   environment like an initramfs.

3/ Do a full-tree search of sysfs.

[kay.sievers@vrfy.org: fix duplicate registrations]
[kay.sievers@vrfy.org: cleanup suggestions]

Cc: Neil Brown 
Cc: Tejun Heo 
Acked-by: Kay Sievers 
Reviewed-by: SL Baur 
Acked-by: Kay Sievers 
Acked-by: Mark Lord 
Acked-by: H. Peter Anvin 
Signed-off-by: Dan Williams 
Signed-off-by: Greg Kroah-Hartman

sysfs: refill attribute buffer when reading from offset 0

2008-04-20T02:10:29+00:00

Requiring userspace to close and re-open sysfs attributes has been the
policy since before 2.6.12.  It allows userspace to get a consistent
snapshot of kernel state and consume it with incremental reads and seeks.

Now, if the file position is zero the kernel assumes userspace wants to see
the new value.  The application for this change is to allow a userspace
RAID metadata handler to check the state of an array without causing any
memory allocations.  Thus not causing writeback to a raid array that might
be blocked waiting for userspace to take action.

Cc: Neil Brown 
Acked-by: Tejun Heo 
Signed-off-by: Dan Williams 
Signed-off-by: Greg Kroah-Hartman

docs/sysfs: add missing word to sysfs attribute explanation

2007-10-20T00:39:43+00:00

Add the obvious missing word.

Signed-off-by: Shaun Zinck 
Signed-off-by: Adrian Bunk

Fix typos in Documentation/: 'D'-'E'

2006-10-03T20:47:42+00:00

This patch fixes typos in various Documentation txts. This patch addresses
some words starting with the letters 'D'-'E'.

Signed-off-by: Matt LaPlante 
Signed-off-by: Adrian Bunk

[doc] add paragraph about 'fs' subsystem to sysfs.txt

2006-04-26T08:49:26+00:00

Signed-off-by: Miklos Szeredi

[PATCH] Driver core: Documentation: use S_IRUSR | ... in stead of 0644

2005-09-05T23:03:12+00:00

Change filemode to use defines in stead of 0644,
based on suggestions by Walter Harms and Domen Puncer.

Signed-off-by: Jan Veldeman 
Signed-off-by: Domen Puncer 
Signed-off-by: Greg Kroah-Hartman

[PATCH] Driver core: Documentation: fix whitespace between parameters

2005-09-05T23:03:12+00:00

Fix whitespace after comma between parameters.

Signed-off-by: Jan Veldeman 
Signed-off-by: Domen Puncer 
Signed-off-by: Greg Kroah-Hartman

[PATCH] Driver core: Documentation: update device attribute callbacks

2005-06-20T22:15:32+00:00

Signed-off-by: Yani Ioannou 
Signed-off-by: Greg Kroah-Hartman