/* 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 <teheo@suse.de>

   */
  
  #ifndef __KERNFS_INTERNAL_H
  #define __KERNFS_INTERNAL_H
  
  #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;

  };

  /* +1 to avoid triggering overflow warning when negating it */
  #define KN_DEACTIVATED_BIAS		(INT_MIN + 1)

  /* 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 inode *inode, int mask);
  int kernfs_iop_setattr(struct dentry *dentry, struct iattr *iattr);

  int kernfs_iop_getattr(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);

  struct kernfs_node *kernfs_find_and_get_node_by_ino(struct kernfs_root *root,
  						    unsigned int ino);

  /*
   * 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 */