diff options
Diffstat (limited to 'fs/kernfs/kernfs-internal.h')
| -rw-r--r-- | fs/kernfs/kernfs-internal.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/fs/kernfs/kernfs-internal.h b/fs/kernfs/kernfs-internal.h index 62ae35f997f7..7dfe06278350 100644 --- a/fs/kernfs/kernfs-internal.h +++ b/fs/kernfs/kernfs-internal.h @@ -25,6 +25,12 @@ struct sysfs_elem_dir { unsigned long subdirs; /* children rbtree starts here and goes through sd->s_rb */ struct rb_root children; + + /* + * The kernfs hierarchy this directory belongs to. This fits + * better directly in sysfs_dirent but is here to save space. + */ + struct kernfs_root *root; }; struct sysfs_elem_symlink { @@ -104,6 +110,20 @@ static inline unsigned int sysfs_type(struct sysfs_dirent *sd) return sd->s_flags & SYSFS_TYPE_MASK; } +/** + * kernfs_root - find out the kernfs_root a sysfs_dirent belongs to + * @sd: sysfs_dirent of interest + * + * Return the kernfs_root @sd belongs to. + */ +static inline struct kernfs_root *kernfs_root(struct sysfs_dirent *sd) +{ + /* if parent exists, it's always a dir; otherwise, @sd is a dir */ + if (sd->s_parent) + sd = sd->s_parent; + return sd->s_dir.root; +} + /* * Context structure to be used while adding/removing nodes. */ |