linux-toradex.git/fs/sysfs/group.c, branch v2.6.34.4

Use WARN() in fs/sysfs

2008-07-26T19:00:07+00:00

Use WARN() instead of a printk+WARN_ON() pair; this way the message becomes
part of the warning section for better reporting/collection.  Also, with this,
one fo the if() sections collapses entirely into the WARN().

Signed-off-by: Arjan van de Ven 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[SCSI] sysfs: make group is_valid return a mode_t

2008-04-22T20:16:31+00:00

We have a problem in scsi_transport_spi in that we need to customise
not only the visibility of the attributes, but also their mode.  Fix
this by making the is_visible() callback return a mode, with 0
indicating is not visible.

Also add a sysfs_update_group() API to allow us to change either the
visibility or mode of the files at any time on the fly.

Acked-by: Kay Sievers 
Signed-off-by: James Bottomley

sysfs: remove BUG_ON() from sysfs_remove_group()

2008-02-07T19:31:46+00:00

It's possible that the caller of sysfs_remove_group messed up and passed in an attribute group that was not really registered to this kobject.  But don't panic for such a foolish error, spit out a warning about what happened, and continue on our way safely.

Cc: Roland Dreier 
Cc: Tejun Heo 
Signed-off-by: Greg Kroah-Hartman

[SCSI] sysfs: add filter function to groups

2008-01-23T17:29:18+00:00

This patch allows the various users of attribute_groups to selectively
allow the appearance of group attributes.  The primary consumer of
this will be the transport classes in which we currently have
elaborate attribute selection algorithms to do this same thing.

Acked-by: Greg KH 
Signed-off-by: James Bottomley

sysfs: Remove first pass at shadow directory support

2007-10-12T21:51:03+00:00

While shadow directories appear to be a good idea, the current scheme
of controlling their creation and destruction outside of sysfs appears
to be a locking and maintenance nightmare in the face of sysfs
directories dynamically coming and going.  Which can now occur for
directories containing network devices when CONFIG_SYSFS_DEPRECATED is
not set.

This patch removes everything from the initial shadow directory support
that allowed the shadow directory creation to be controlled at a higher
level.  So except for a few bits of sysfs_rename_dir everything from
commit b592fcfe7f06c15ec11774b5be7ce0de3aa86e73 is now gone.

Signed-off-by: Eric W. Biederman 
Signed-off-by: Tejun Heo 
Signed-off-by: Greg Kroah-Hartman

sysfs: cleanup semaphore.h

2007-10-12T21:51:03+00:00

Cleanup semaphore.h

Signed-off-by: Dave Young 
Signed-off-by: Greg Kroah-Hartman

sysfs: make kobj point to sysfs_dirent instead of dentry

2007-07-11T23:09:08+00:00

As kobj sysfs dentries and inodes are gonna be made reclaimable,
dentry can't be used as naming token for sysfs file/directory, replace
kobj->dentry with kobj->sd.  The only external interface change is
shadow directory handling.  All other changes are contained in kobj
and sysfs.

Signed-off-by: Tejun Heo 
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

sysfs: Shadow directory support

2007-02-07T18:37:14+00:00

The problem.  When implementing a network namespace I need to be able
to have multiple network devices with the same name.  Currently this
is a problem for /sys/class/net/*. 

What I want is a separate /sys/class/net directory in sysfs for each
network namespace, and I want to name each of them /sys/class/net.

I looked and the VFS actually allows that.  All that is needed is
for /sys/class/net to implement a follow link method to redirect
lookups to the real directory you want. 

Implementing a follow link method that is sensitive to the current
network namespace turns out to be 3 lines of code so it looks like a
clean approach.  Modifying sysfs so it doesn't get in my was is a bit
trickier. 

I am calling the concept of multiple directories all at the same path
in the filesystem shadow directories.  With the directory entry really
at that location the shadow master. 

The following patch modifies sysfs so it can handle a directory
structure slightly different from the kobject tree so I can implement
the shadow directories for handling /sys/class/net/.

Signed-off-by: Eric W. Biederman 
Cc: Maneesh Soni 
Signed-off-by: Greg Kroah-Hartman

Driver core: fix race in sysfs between sysfs_remove_file() and read()/write()

2007-02-07T18:37:13+00:00

This patch prevents a race between IO and removing a file from sysfs.
It introduces a list of sysfs_buffers associated with a file at the inode.
Upon removal of a file the list is walked and the buffers marked orphaned.
IO to orphaned buffers fails with -ENODEV. The driver can safely free
associated data structures or be unloaded.

Signed-off-by: Oliver Neukum 
Acked-by: Maneesh Soni 
Signed-off-by: Greg Kroah-Hartman