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| author | Tejun Heo <htejun@gmail.com> | 2007-06-13 22:45:14 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-07-12 03:09:04 +0400 |
| commit | 13b3086d2ea483cbcae5a4236446cecc082a72cf (patch) | |
| tree | f6932aaf486a302aa7b03857d780bafda33db2d6 /fs/sysfs/mount.c | |
| parent | a26cd7226c24c3be5dd5f48a74832fe64beb8489 (diff) | |
| download | linux-13b3086d2ea483cbcae5a4236446cecc082a72cf.tar.xz | |
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>
Diffstat (limited to 'fs/sysfs/mount.c')
| -rw-r--r-- | fs/sysfs/mount.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c index 00ab9125d398..31c1fc67f604 100644 --- a/fs/sysfs/mount.c +++ b/fs/sysfs/mount.c @@ -28,6 +28,7 @@ static const struct super_operations sysfs_ops = { }; static struct sysfs_dirent sysfs_root = { + .s_count = ATOMIC_INIT(1), .s_sibling = LIST_HEAD_INIT(sysfs_root.s_sibling), .s_children = LIST_HEAD_INIT(sysfs_root.s_children), .s_element = NULL, |