diff options
| -rw-r--r-- | fs/kernfs/dir.c | 18 | ||||
| -rw-r--r-- | fs/kernfs/mount.c | 14 | ||||
| -rw-r--r-- | include/linux/kernfs.h | 16 |
3 files changed, 48 insertions, 0 deletions
diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c index 3cff0a233cd1..42a250f83b98 100644 --- a/fs/kernfs/dir.c +++ b/fs/kernfs/dir.c @@ -350,6 +350,24 @@ const struct dentry_operations kernfs_dops = { .d_release = kernfs_dop_release, }; +/** + * kernfs_node_from_dentry - determine kernfs_node associated with a dentry + * @dentry: the dentry in question + * + * Return the kernfs_node associated with @dentry. If @dentry is not a + * kernfs one, %NULL is returned. + * + * While the returned kernfs_node will stay accessible as long as @dentry + * is accessible, the returned node can be in any state and the caller is + * fully responsible for determining what's accessible. + */ +struct kernfs_node *kernfs_node_from_dentry(struct dentry *dentry) +{ + if (dentry->d_op == &kernfs_dops) + return dentry->d_fsdata; + return NULL; +} + static struct kernfs_node *__kernfs_new_node(struct kernfs_root *root, const char *name, umode_t mode, unsigned flags) diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c index 70cc6983d9b5..e5b28b0ebc37 100644 --- a/fs/kernfs/mount.c +++ b/fs/kernfs/mount.c @@ -48,6 +48,20 @@ static const struct super_operations kernfs_sops = { .show_options = kernfs_sop_show_options, }; +/** + * kernfs_root_from_sb - determine kernfs_root associated with a super_block + * @sb: the super_block in question + * + * Return the kernfs_root associated with @sb. If @sb is not a kernfs one, + * %NULL is returned. + */ +struct kernfs_root *kernfs_root_from_sb(struct super_block *sb) +{ + if (sb->s_op == &kernfs_sops) + return kernfs_info(sb)->root; + return NULL; +} + static int kernfs_fill_super(struct super_block *sb) { struct kernfs_super_info *info = kernfs_info(sb); diff --git a/include/linux/kernfs.h b/include/linux/kernfs.h index 9ca0f09757a1..9c899040c05e 100644 --- a/include/linux/kernfs.h +++ b/include/linux/kernfs.h @@ -234,6 +234,9 @@ struct kernfs_node *kernfs_find_and_get_ns(struct kernfs_node *parent, void kernfs_get(struct kernfs_node *kn); void kernfs_put(struct kernfs_node *kn); +struct kernfs_node *kernfs_node_from_dentry(struct dentry *dentry); +struct kernfs_root *kernfs_root_from_sb(struct super_block *sb); + struct kernfs_root *kernfs_create_root(struct kernfs_syscall_ops *scops, unsigned int flags, void *priv); void kernfs_destroy_root(struct kernfs_root *root); @@ -288,6 +291,12 @@ kernfs_find_and_get_ns(struct kernfs_node *parent, const char *name, static inline void kernfs_get(struct kernfs_node *kn) { } static inline void kernfs_put(struct kernfs_node *kn) { } +static inline struct kernfs_node *kernfs_node_from_dentry(struct dentry *dentry) +{ return NULL; } + +static inline struct kernfs_root *kernfs_root_from_sb(struct super_block *sb) +{ return NULL; } + static inline struct kernfs_root * kernfs_create_root(struct kernfs_syscall_ops *scops, unsigned int flags, void *priv) @@ -388,6 +397,13 @@ static inline int kernfs_remove_by_name(struct kernfs_node *parent, return kernfs_remove_by_name_ns(parent, name, NULL); } +static inline int kernfs_rename(struct kernfs_node *kn, + struct kernfs_node *new_parent, + const char *new_name) +{ + return kernfs_rename_ns(kn, new_parent, new_name, NULL); +} + static inline struct dentry * kernfs_mount(struct file_system_type *fs_type, int flags, struct kernfs_root *root) |