sysfs: add sysfs_dirent->s_parent

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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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Tejun Heo 2007-06-14 03:45:14 +09:00 • committed by Greg Kroah-Hartman

parent a26cd7226c

commit 13b3086d2e

3 changed files with 25 additions and 7 deletions

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30

fs/sysfs/dir.c

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1

fs/sysfs/mount.c

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1

fs/sysfs/sysfs.h

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