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| author |   Tejun Heo <htejun@gmail.com> | 2007-06-14 03:45:14 +0900 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@suse.de> | 2007-07-11 16:09:04 -0700 |
| commit | 13b3086d2ea483cbcae5a4236446cecc082a72cf (patch) | |
| tree | f6932aaf486a302aa7b03857d780bafda33db2d6 /fs/sysfs/sysfs.h | |
| parent | sysfs: consolidate sysfs_dirent creation functions (diff) | |
| download | linux-dev-13b3086d2ea483cbcae5a4236446cecc082a72cf.tar.xz linux-dev-13b3086d2ea483cbcae5a4236446cecc082a72cf.zip | |
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/sysfs.h')
| -rw-r--r-- | fs/sysfs/sysfs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h index f8f49cc5c852..ce05d6fd7522 100644 --- a/fs/sysfs/sysfs.h +++ b/fs/sysfs/sysfs.h @@ -1,5 +1,6 @@ struct sysfs_dirent { atomic_t s_count; + struct sysfs_dirent * s_parent; struct list_head s_sibling; struct list_head s_children; void * s_element; |