blob: ccc3b44f6306f6e771990e5596106026d9ad1448 [file] [log] [blame]
/* SPDX-License-Identifier: GPL-2.0-only */
* fs/kernfs/kernfs-internal.h - kernfs internal header file
* Copyright (c) 2001-3 Patrick Mochel
* Copyright (c) 2007 SUSE Linux Products GmbH
* Copyright (c) 2007, 2013 Tejun Heo <>
#include <linux/lockdep.h>
#include <linux/fs.h>
#include <linux/mutex.h>
#include <linux/xattr.h>
#include <linux/kernfs.h>
#include <linux/fs_context.h>
struct kernfs_iattrs {
kuid_t ia_uid;
kgid_t ia_gid;
struct timespec64 ia_atime;
struct timespec64 ia_mtime;
struct timespec64 ia_ctime;
struct simple_xattrs xattrs;
atomic_t nr_user_xattrs;
atomic_t user_xattr_size;
/* +1 to avoid triggering overflow warning when negating it */
/* KERNFS_TYPE_MASK and types are defined in include/linux/kernfs.h */
* kernfs_root - find out the kernfs_root a kernfs_node belongs to
* @kn: kernfs_node of interest
* Return the kernfs_root @kn belongs to.
static inline struct kernfs_root *kernfs_root(struct kernfs_node *kn)
/* if parent exists, it's always a dir; otherwise, @sd is a dir */
if (kn->parent)
kn = kn->parent;
return kn->dir.root;
* mount.c
struct kernfs_super_info {
struct super_block *sb;
* The root associated with this super_block. Each super_block is
* identified by the root and ns it's associated with.
struct kernfs_root *root;
* Each sb is associated with one namespace tag, currently the
* network namespace of the task which mounted this kernfs
* instance. If multiple tags become necessary, make the following
* an array and compare kernfs_node tag against every entry.
const void *ns;
/* anchored at kernfs_root->supers, protected by kernfs_mutex */
struct list_head node;
#define kernfs_info(SB) ((struct kernfs_super_info *)(SB->s_fs_info))
static inline struct kernfs_node *kernfs_dentry_node(struct dentry *dentry)
if (d_really_is_negative(dentry))
return NULL;
return d_inode(dentry)->i_private;
extern const struct super_operations kernfs_sops;
extern struct kmem_cache *kernfs_node_cache, *kernfs_iattrs_cache;
* inode.c
extern const struct xattr_handler *kernfs_xattr_handlers[];
void kernfs_evict_inode(struct inode *inode);
int kernfs_iop_permission(struct user_namespace *mnt_userns,
struct inode *inode, int mask);
int kernfs_iop_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
struct iattr *iattr);
int kernfs_iop_getattr(struct user_namespace *mnt_userns,
const struct path *path, struct kstat *stat,
u32 request_mask, unsigned int query_flags);
ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size);
int __kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr);
* dir.c
extern struct mutex kernfs_mutex;
extern const struct dentry_operations kernfs_dops;
extern const struct file_operations kernfs_dir_fops;
extern const struct inode_operations kernfs_dir_iops;
struct kernfs_node *kernfs_get_active(struct kernfs_node *kn);
void kernfs_put_active(struct kernfs_node *kn);
int kernfs_add_one(struct kernfs_node *kn);
struct kernfs_node *kernfs_new_node(struct kernfs_node *parent,
const char *name, umode_t mode,
kuid_t uid, kgid_t gid,
unsigned flags);
* file.c
extern const struct file_operations kernfs_file_fops;
void kernfs_drain_open_files(struct kernfs_node *kn);
* symlink.c
extern const struct inode_operations kernfs_symlink_iops;
#endif /* __KERNFS_INTERNAL_H */