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 int __generic_write_end(struct inode *inode, loff_t pos, unsigned copied,
  47                 struct page *page);
  48
  49 /*
  50  * char_dev.c
  51  */
  52 extern void __init chrdev_init(void);
  53
  54 /*
  55  * namei.c
  56  */
  57 extern int user_path_mountpoint_at(int, const char __user *, unsigned int, struct path *);
  58 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
  59                            const char *, unsigned int, struct path *);
  60 long do_mknodat(int dfd, const char __user *filename, umode_t mode,
  61                 unsigned int dev);
  62 long do_mkdirat(int dfd, const char __user *pathname, umode_t mode);
  63 long do_rmdir(int dfd, const char __user *pathname);
  64 long do_unlinkat(int dfd, struct filename *name);
  65 long do_symlinkat(const char __user *oldname, int newdfd,
  66                   const char __user *newname);
  67 int do_linkat(int olddfd, const char __user *oldname, int newdfd,
  68               const char __user *newname, int flags);
  69
  70 /*
  71  * namespace.c
  72  */
  73 extern void *copy_mount_options(const void __user *);
  74 extern char *copy_mount_string(const void __user *);
  75
  76 extern struct vfsmount *lookup_mnt(const struct path *);
  77 extern int finish_automount(struct vfsmount *, struct path *);
  78
  79 extern int sb_prepare_remount_readonly(struct super_block *);
  80
  81 extern void __init mnt_init(void);
  82
  83 extern int __mnt_want_write(struct vfsmount *);
  84 extern int __mnt_want_write_file(struct file *);
  85 extern void __mnt_drop_write(struct vfsmount *);
  86 extern void __mnt_drop_write_file(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 *alloc_empty_file(int, const struct cred *);
  97 extern struct file *alloc_empty_file_noaccount(int, const struct cred *);
  98
  99 /*
 100  * super.c
 101  */
 102 extern int do_remount_sb(struct super_block *, int, void *, int);
 103 extern bool trylock_super(struct super_block *sb);
 104 extern struct dentry *mount_fs(struct file_system_type *,
 105                                int, const char *, void *);
 106 extern struct super_block *user_get_super(dev_t);
 107
 108 /*
 109  * open.c
 110  */
 111 struct open_flags {
 112         int open_flag;
 113         umode_t mode;
 114         int acc_mode;
 115         int intent;
 116         int lookup_flags;
 117 };
 118 extern struct file *do_filp_open(int dfd, struct filename *pathname,
 119                 const struct open_flags *op);
 120 extern struct file *do_file_open_root(struct dentry *, struct vfsmount *,
 121                 const char *, const struct open_flags *);
 122
 123 long do_sys_ftruncate(unsigned int fd, loff_t length, int small);
 124 long do_faccessat(int dfd, const char __user *filename, int mode);
 125 int do_fchmodat(int dfd, const char __user *filename, umode_t mode);
 126 int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
 127                 int flag);
 128
 129 extern int vfs_open(const struct path *, struct file *);
 130
 131 /*
 132  * inode.c
 133  */
 134 extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
 135 extern void inode_add_lru(struct inode *inode);
 136 extern int dentry_needs_remove_privs(struct dentry *dentry);
 137
 138 /*
 139  * fs-writeback.c
 140  */
 141 extern void inode_io_list_del(struct inode *inode);
 142
 143 extern long get_nr_dirty_inodes(void);
 144 extern int invalidate_inodes(struct super_block *, bool);
 145
 146 /*
 147  * dcache.c
 148  */
 149 extern struct dentry *__d_alloc(struct super_block *, const struct qstr *);
 150 extern int d_set_mounted(struct dentry *dentry);
 151 extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
 152 extern struct dentry *d_alloc_cursor(struct dentry *);
 153
 154 /*
 155  * read_write.c
 156  */
 157 extern int rw_verify_area(int, struct file *, const loff_t *, size_t);
 158
 159 /*
 160  * pipe.c
 161  */
 162 extern const struct file_operations pipefifo_fops;
 163
 164 /*
 165  * fs_pin.c
 166  */
 167 extern void group_pin_kill(struct hlist_head *p);
 168 extern void mnt_pin_kill(struct mount *m);
 169
 170 /*
 171  * fs/nsfs.c
 172  */
 173 extern const struct dentry_operations ns_dentry_operations;
 174
 175 /*
 176  * fs/ioctl.c
 177  */
 178 extern int do_vfs_ioctl(struct file *file, unsigned int fd, unsigned int cmd,
 179                     unsigned long arg);
 180
 181 /*
 182  * iomap support:
 183  */
 184 typedef loff_t (*iomap_actor_t)(struct inode *inode, loff_t pos, loff_t len,
 185                 void *data, struct iomap *iomap);
 186
 187 loff_t iomap_apply(struct inode *inode, loff_t pos, loff_t length,
 188                 unsigned flags, const struct iomap_ops *ops, void *data,
 189                 iomap_actor_t actor);
 190
 191 /* direct-io.c: */
 192 int sb_init_dio_done_wq(struct super_block *sb);