fs/internal.h

   1 /* fs/ internal definitions
   2  *
   3  * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 struct super_block;
  13 struct file_system_type;
  14 struct iomap;
  15 struct iomap_ops;
  16 struct linux_binprm;
  17 struct path;
  18 struct mount;
  19 struct shrink_control;
  20
  21 /*
  22  * block_dev.c
  23  */
  24 #ifdef CONFIG_BLOCK
  25 extern void __init bdev_cache_init(void);
  26
  27 extern int __sync_blockdev(struct block_device *bdev, int wait);
  28
  29 #else
  30 static inline void bdev_cache_init(void)
  31 {
  32 }
  33
  34 static inline int __sync_blockdev(struct block_device *bdev, int wait)
  35 {
  36         return 0;
  37 }
  38 #endif
  39
  40 /*
  41  * buffer.c
  42  */
  43 extern void guard_bio_eod(int rw, struct bio *bio);
  44 extern int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
  45                 get_block_t *get_block, struct iomap *iomap);
  46
  47 /*
  48  * char_dev.c
  49  */
  50 extern void __init chrdev_init(void);
  51
  52 /*
  53  * namei.c
  54  */
  55 extern int user_path_mountpoint_at(int, const char __user *, unsigned int, struct path *);
  56 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
  57                            const char *, unsigned int, struct path *);
  58
  59 /*
  60  * namespace.c
  61  */
  62 extern void *copy_mount_options(const void __user *);
  63 extern char *copy_mount_string(const void __user *);
  64
  65 extern struct vfsmount *lookup_mnt(struct path *);
  66 extern int finish_automount(struct vfsmount *, struct path *);
  67
  68 extern int sb_prepare_remount_readonly(struct super_block *);
  69
  70 extern void __init mnt_init(void);
  71
  72 extern int __mnt_want_write(struct vfsmount *);
  73 extern int __mnt_want_write_file(struct file *);
  74 extern void __mnt_drop_write(struct vfsmount *);
  75 extern void __mnt_drop_write_file(struct file *);
  76
  77 /*
  78  * fs_struct.c
  79  */
  80 extern void chroot_fs_refs(const struct path *, const struct path *);
  81
  82 /*
  83  * file_table.c
  84  */
  85 extern struct file *get_empty_filp(void);
  86
  87 /*
  88  * super.c
  89  */
  90 extern int do_remount_sb(struct super_block *, int, void *, int);
  91 extern bool trylock_super(struct super_block *sb);
  92 extern struct dentry *mount_fs(struct file_system_type *,
  93                                int, const char *, void *);
  94 extern struct super_block *user_get_super(dev_t);
  95
  96 /*
  97  * open.c
  98  */
  99 struct open_flags {
 100         int open_flag;
 101         umode_t mode;
 102         int acc_mode;
 103         int intent;
 104         int lookup_flags;
 105 };
 106 extern struct file *do_filp_open(int dfd, struct filename *pathname,
 107                 const struct open_flags *op);
 108 extern struct file *do_file_open_root(struct dentry *, struct vfsmount *,
 109                 const char *, const struct open_flags *);
 110
 111 extern long do_handle_open(int mountdirfd,
 112                            struct file_handle __user *ufh, int open_flag);
 113 extern int open_check_o_direct(struct file *f);
 114 extern int vfs_open(const struct path *, struct file *, const struct cred *);
 115 extern struct file *filp_clone_open(struct file *);
 116
 117 /*
 118  * inode.c
 119  */
 120 extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
 121 extern void inode_add_lru(struct inode *inode);
 122 extern int dentry_needs_remove_privs(struct dentry *dentry);
 123
 124 extern bool __atime_needs_update(const struct path *, struct inode *, bool);
 125 static inline bool atime_needs_update_rcu(const struct path *path,
 126                                           struct inode *inode)
 127 {
 128         return __atime_needs_update(path, inode, true);
 129 }
 130
 131 extern bool atime_needs_update_rcu(const struct path *, struct inode *);
 132
 133 /*
 134  * fs-writeback.c
 135  */
 136 extern void inode_io_list_del(struct inode *inode);
 137
 138 extern long get_nr_dirty_inodes(void);
 139 extern void evict_inodes(struct super_block *);
 140 extern int invalidate_inodes(struct super_block *, bool);
 141
 142 /*
 143  * dcache.c
 144  */
 145 extern struct dentry *__d_alloc(struct super_block *, const struct qstr *);
 146 extern int d_set_mounted(struct dentry *dentry);
 147 extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
 148 extern struct dentry *d_alloc_cursor(struct dentry *);
 149
 150 /*
 151  * read_write.c
 152  */
 153 extern int rw_verify_area(int, struct file *, const loff_t *, size_t);
 154
 155 /*
 156  * pipe.c
 157  */
 158 extern const struct file_operations pipefifo_fops;
 159
 160 /*
 161  * fs_pin.c
 162  */
 163 extern void group_pin_kill(struct hlist_head *p);
 164 extern void mnt_pin_kill(struct mount *m);
 165
 166 /*
 167  * fs/nsfs.c
 168  */
 169 extern const struct dentry_operations ns_dentry_operations;
 170
 171 /*
 172  * fs/ioctl.c
 173  */
 174 extern int do_vfs_ioctl(struct file *file, unsigned int fd, unsigned int cmd,
 175                     unsigned long arg);
 176 extern long vfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 177
 178 /*
 179  * iomap support:
 180  */
 181 typedef loff_t (*iomap_actor_t)(struct inode *inode, loff_t pos, loff_t len,
 182                 void *data, struct iomap *iomap);
 183
 184 loff_t iomap_apply(struct inode *inode, loff_t pos, loff_t length,
 185                 unsigned flags, struct iomap_ops *ops, void *data,
 186                 iomap_actor_t actor);