text: /* SPDX-License-Identifier: GPL-2.0-or-later */
  /* fs/ internal definitions
   *
   * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
   * Written by David Howells (dhowells@redhat.com)
   */
  
  struct super_block;
  struct file_system_type;
  struct iomap;
  struct iomap_ops;
  struct linux_binprm;
  struct path;
  struct mount;
  struct shrink_control;
  struct fs_context;
  struct user_namespace;
  struct pipe_inode_info;
  
  /*
   * block/bdev.c
   */
  #ifdef CONFIG_BLOCK
  extern void __init bdev_cache_init(void);
  
  void emergency_thaw_bdev(struct super_block *sb);
  #else
  static inline void bdev_cache_init(void)
  {
  }
  static inline int emergency_thaw_bdev(struct super_block *sb)
  {
  	return 0;
  }
  #endif /* CONFIG_BLOCK */
  
  /*
   * buffer.c
   */
  int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
  		get_block_t *get_block, const struct iomap *iomap);
  
  /*
   * char_dev.c
   */
  extern void __init chrdev_init(void);
  
  /*
   * fs_context.c
   */
  extern const struct fs_context_operations legacy_fs_context_ops;
  extern int parse_monolithic_mount_data(struct fs_context *, void *);
  extern void vfs_clean_context(struct fs_context *fc);
  extern int finish_clean_context(struct fs_context *fc);
  
  /*
   * namei.c
   */
  extern int filename_lookup(int dfd, struct filename *name, unsigned flags,
  			   struct path *path, struct path *root);
  extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
  			   const char *, unsigned int, struct path *);
  int do_rmdir(int dfd, struct filename *name);
  int do_unlinkat(int dfd, struct filename *name);
  int may_linkat(struct user_namespace *mnt_userns, struct path *link);
  int do_renameat2(int olddfd, struct filename *oldname, int newdfd,
  		 struct filename *newname, unsigned int flags);
  int do_mkdirat(int dfd, struct filename *name, umode_t mode);
  int do_symlinkat(struct filename *from, int newdfd, struct filename *to);
  int do_linkat(int olddfd, struct filename *old, int newdfd,
  			struct filename *new, int flags);
  
  /*
   * namespace.c
   */
  extern struct vfsmount *lookup_mnt(const struct path *);
  extern int finish_automount(struct vfsmount *, struct path *);
  
  extern int sb_prepare_remount_readonly(struct super_block *);
  
  extern void __init mnt_init(void);
  
  extern int __mnt_want_write_file(struct file *);
  extern void __mnt_drop_write_file(struct file *);
  
  extern void dissolve_on_fput(struct vfsmount *);
  
  int path_mount(const char *dev_name, struct path *path,
  		const char *type_page, unsigned long flags, void *data_page);
  int path_umount(struct path *path, int flags);
  
  /*
   * fs_struct.c
   */
  extern void chroot_fs_refs(const struct path *, const struct path *);
  
  /*
   * file_table.c
   */
  extern struct file *alloc_empty_file(int, const struct cred *);
  extern struct file *alloc_empty_file_noaccount(int, const struct cred *);
  
  /*
   * super.c
   */
  extern int reconfigure_super(struct fs_context *);
  extern bool trylock_super(struct super_block *sb);
  struct super_block *user_get_super(dev_t, bool excl);
  void put_super(struct super_block *sb);
  extern bool mount_capable(struct fs_context *);
  
  /*
   * open.c
   */
  struct open_flags {
  	int open_flag;
  	umode_t mode;
  	int acc_mode;
  	int intent;
  	int lookup_flags;
  };
  extern struct file *do_filp_open(int dfd, struct filename *pathname,
  		const struct open_flags *op);
  extern struct file *do_file_open_root(const struct path *,
  		const char *, const struct open_flags *);
  extern struct open_how build_open_how(int flags, umode_t mode);
  extern int build_open_flags(const struct open_how *how, struct open_flags *op);
  extern int __close_fd_get_file(unsigned int fd, struct file **res);
  
  long do_sys_ftruncate(unsigned int fd, loff_t length, int small);
  int chmod_common(const struct path *path, umode_t mode);
  int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
  		int flag);
  int chown_common(const struct path *path, uid_t user, gid_t group);
  extern int vfs_open(const struct path *, struct file *);
  
  /*
   * inode.c
   */
  extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
  extern void inode_add_lru(struct inode *inode);
  extern int dentry_needs_remove_privs(struct dentry *dentry);
  
  /*
   * fs-writeback.c
   */
  extern long get_nr_dirty_inodes(void);
  extern int invalidate_inodes(struct super_block *, bool);
  
  /*
   * dcache.c
   */
  extern int d_set_mounted(struct dentry *dentry);
  extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
  extern struct dentry *d_alloc_cursor(struct dentry *);
  extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *);
  extern char *simple_dname(struct dentry *, char *, int);
  extern void dput_to_list(struct dentry *, struct list_head *);
  extern void shrink_dentry_list(struct list_head *);
  
  /*
   * read_write.c
   */
  extern int rw_verify_area(int, struct file *, const loff_t *, size_t);
  
  /*
   * pipe.c
   */
  extern const struct file_operations pipefifo_fops;
  
  /*
   * fs_pin.c
   */
  extern void group_pin_kill(struct hlist_head *p);
  extern void mnt_pin_kill(struct mount *m);
  
  /*
   * fs/nsfs.c
   */
  extern const struct dentry_operations ns_dentry_operations;
  
  /* direct-io.c: */
  int sb_init_dio_done_wq(struct super_block *sb);
  
  /*
   * fs/stat.c:
   */
  int do_statx(int dfd, const char __user *filename, unsigned flags,
  	     unsigned int mask, struct statx __user *buffer);
  
  /*
   * fs/splice.c:
   */
  long splice_file_to_pipe(struct file *in,
  			 struct pipe_inode_info *opipe,
  			 loff_t *offset,
  			 size_t len, unsigned int flags);
  