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 long do_mknodat(int dfd, const char __user *filename, umode_t mode,
  59                 unsigned int dev);
  60 long do_mkdirat(int dfd, const char __user *pathname, umode_t mode);
  61 long do_rmdir(int dfd, const char __user *pathname);
  62 long do_unlinkat(int dfd, struct filename *name);
  63 long do_symlinkat(const char __user *oldname, int newdfd,
  64                   const char __user *newname);
  65 int do_linkat(int olddfd, const char __user *oldname, int newdfd,
  66               const char __user *newname, int flags);
  67
  68 /*
  69  * namespace.c
  70  */
  71 extern void *copy_mount_options(const void __user *);
  72 extern char *copy_mount_string(const void __user *);
  73
  74 extern struct vfsmount *lookup_mnt(const struct path *);
  75 extern int finish_automount(struct vfsmount *, struct path *);
  76
  77 extern int sb_prepare_remount_readonly(struct super_block *);
  78
  79 extern void __init mnt_init(void);
  80
  81 extern int __mnt_want_write(struct vfsmount *);
  82 extern int __mnt_want_write_file(struct file *);
  83 extern int mnt_want_write_file_path(struct file *);
  84 extern void __mnt_drop_write(struct vfsmount *);
  85 extern void __mnt_drop_write_file(struct file *);
  86 extern void mnt_drop_write_file_path(struct file *);
  87
  88 /*
  89  * fs_struct.c
  90  */
  91 extern void chroot_fs_refs(const struct path *, const struct path *);
  92
  93 /*
  94  * file_table.c
  95  */
  96 extern struct file *get_empty_filp(void);
  97
  98 /*
  99  * super.c
 100  */
 101 extern int do_remount_sb(struct super_block *, int, void *, int);
 102 extern bool trylock_super(struct super_block *sb);
 103 extern struct dentry *mount_fs(struct file_system_type *,
 104                                int, const char *, void *);
 105 extern struct super_block *user_get_super(dev_t);
 106
 107 /*
 108  * open.c
 109  */
 110 struct open_flags {
 111         int open_flag;
 112         umode_t mode;
 113         int acc_mode;
 114         int intent;
 115         int lookup_flags;
 116 };
 117 extern struct file *do_filp_open(int dfd, struct filename *pathname,
 118                 const struct open_flags *op);
 119 extern struct file *do_file_open_root(struct dentry *, struct vfsmount *,
 120                 const char *, const struct open_flags *);
 121
 122 long do_sys_ftruncate(unsigned int fd, loff_t length, int small);
 123 long do_faccessat(int dfd, const char __user *filename, int mode);
 124 int do_fchmodat(int dfd, const char __user *filename, umode_t mode);
 125 int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
 126                 int flag);
 127
 128 extern int open_check_o_direct(struct file *f);
 129 extern int vfs_open(const struct path *, struct file *, const struct cred *);
 130 extern struct file *filp_clone_open(struct file *);
 131
 132 /*
 133  * inode.c
 134  */
 135 extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
 136 extern void inode_add_lru(struct inode *inode);
 137 extern int dentry_needs_remove_privs(struct dentry *dentry);
 138
 139 extern bool __atime_needs_update(const struct path *, struct inode *, bool);
 140 static inline bool atime_needs_update_rcu(const struct path *path,
 141                                           struct inode *inode)
 142 {
 143         return __atime_needs_update(path, inode, true);
 144 }
 145
 146 /*
 147  * fs-writeback.c
 148  */
 149 extern void inode_io_list_del(struct inode *inode);
 150
 151 extern long get_nr_dirty_inodes(void);
 152 extern int invalidate_inodes(struct super_block *, bool);
 153
 154 /*
 155  * dcache.c
 156  */
 157 extern struct dentry *__d_alloc(struct super_block *, const struct qstr *);
 158 extern int d_set_mounted(struct dentry *dentry);
 159 extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
 160 extern struct dentry *d_alloc_cursor(struct dentry *);
 161
 162 /*
 163  * read_write.c
 164  */
 165 extern int rw_verify_area(int, struct file *, const loff_t *, size_t);
 166
 167 /*
 168  * pipe.c
 169  */
 170 extern const struct file_operations pipefifo_fops;
 171
 172 /*
 173  * fs_pin.c
 174  */
 175 extern void group_pin_kill(struct hlist_head *p);
 176 extern void mnt_pin_kill(struct mount *m);
 177
 178 /*
 179  * fs/nsfs.c
 180  */
 181 extern const struct dentry_operations ns_dentry_operations;
 182
 183 /*
 184  * fs/ioctl.c
 185  */
 186 extern int do_vfs_ioctl(struct file *file, unsigned int fd, unsigned int cmd,
 187                     unsigned long arg);
 188 extern long vfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 189
 190 /*
 191  * iomap support:
 192  */
 193 typedef loff_t (*iomap_actor_t)(struct inode *inode, loff_t pos, loff_t len,
 194                 void *data, struct iomap *iomap);
 195
 196 loff_t iomap_apply(struct inode *inode, loff_t pos, loff_t length,
 197                 unsigned flags, const struct iomap_ops *ops, void *data,
 198                 iomap_actor_t actor);
 199
 200 /* direct-io.c: */
 201 int sb_init_dio_done_wq(struct super_block *sb);