From: Tejun Heo <htejun@gmail.com>
Date: Wed, 13 Jun 2007 18:45:14 +0000 (+0900)
Subject: sysfs: add sysfs_dirent->s_parent
X-Git-Tag: v2.6.23-rc1~1107^2~32
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=13b3086d2ea483cbcae5a4236446cecc082a72cf;p=pandora-kernel.git

sysfs: add sysfs_dirent->s_parent

Add sysfs_dirent->s_parent.  With this patch, each sd points to and
holds a reference to its parent.  This allows walking sysfs tree
without referencing sd->s_dentry which can go away anytime if the user
doesn't control when it's deleted.

sd->s_parent is initialized and parent is referenced in
sysfs_attach_dirent().  Reference to parent is released when the sd is
released, so as long as reference to a sd is held, s_parent can be
followed.

dentry walk in sysfs_readdir() is convereted to s_parent walk.

This will be used to reimplement symlink such that it uses only
sysfs_dirent tree.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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