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 #include <linux/lglock.h>
  13
  14 struct super_block;
  15 struct file_system_type;
  16 struct linux_binprm;
  17 struct path;
  18
  19 /*
  20  * block_dev.c
  21  */
  22 #ifdef CONFIG_BLOCK
  23 extern struct super_block *blockdev_superblock;
  24 extern void __init bdev_cache_init(void);
  25
  26 static inline int sb_is_blkdev_sb(struct super_block *sb)
  27 {
  28         return sb == blockdev_superblock;
  29 }
  30
  31 extern int __sync_blockdev(struct block_device *bdev, int wait);
  32
  33 #else
  34 static inline void bdev_cache_init(void)
  35 {
  36 }
  37
  38 static inline int sb_is_blkdev_sb(struct super_block *sb)
  39 {
  40         return 0;
  41 }
  42
  43 static inline int __sync_blockdev(struct block_device *bdev, int wait)
  44 {
  45         return 0;
  46 }
  47 #endif
  48
  49 /*
  50  * char_dev.c
  51  */
  52 extern void __init chrdev_init(void);
  53
  54 /*
  55  * exec.c
  56  */
  57 extern int check_unsafe_exec(struct linux_binprm *);
  58
  59 /*
  60  * namespace.c
  61  */
  62 extern int copy_mount_options(const void __user *, unsigned long *);
  63 extern int copy_mount_string(const void __user *, char **);
  64
  65 extern unsigned int mnt_get_count(struct vfsmount *mnt);
  66 extern struct vfsmount *__lookup_mnt(struct vfsmount *, struct dentry *, int);
  67 extern struct vfsmount *lookup_mnt(struct path *);
  68 extern void mnt_set_mountpoint(struct vfsmount *, struct dentry *,
  69                                 struct vfsmount *);
  70 extern void release_mounts(struct list_head *);
  71 extern void umount_tree(struct vfsmount *, int, struct list_head *);
  72 extern struct vfsmount *copy_tree(struct vfsmount *, struct dentry *, int);
  73 extern int finish_automount(struct vfsmount *, struct path *);
  74
  75 extern void mnt_make_longterm(struct vfsmount *);
  76 extern void mnt_make_shortterm(struct vfsmount *);
  77
  78 extern void __init mnt_init(void);
  79
  80 DECLARE_BRLOCK(vfsmount_lock);
  81
  82
  83 /*
  84  * fs_struct.c
  85  */
  86 extern void chroot_fs_refs(struct path *, struct path *);
  87
  88 /*
  89  * file_table.c
  90  */
  91 extern void file_sb_list_add(struct file *f, struct super_block *sb);
  92 extern void file_sb_list_del(struct file *f);
  93 extern void mark_files_ro(struct super_block *);
  94 extern struct file *get_empty_filp(void);
  95
  96 /*
  97  * super.c
  98  */
  99 extern int do_remount_sb(struct super_block *, int, void *, int);
 100 extern void __put_super(struct super_block *sb);
 101 extern void put_super(struct super_block *sb);
 102 extern struct dentry *mount_fs(struct file_system_type *,
 103                                int, const char *, void *);
 104
 105 /*
 106  * open.c
 107  */
 108 struct nameidata;
 109 extern struct file *nameidata_to_filp(struct nameidata *);
 110 extern void release_open_intent(struct nameidata *);
 111 struct open_flags {
 112         int open_flag;
 113         int mode;
 114         int acc_mode;
 115         int intent;
 116 };
 117 extern struct file *do_filp_open(int dfd, const char *pathname,
 118                 const struct open_flags *op, int lookup_flags);
 119 extern struct file *do_file_open_root(struct dentry *, struct vfsmount *,
 120                 const char *, const struct open_flags *, int lookup_flags);
 121
 122 extern long do_handle_open(int mountdirfd,
 123                            struct file_handle __user *ufh, int open_flag);
 124
 125 /*
 126  * inode.c
 127  */
 128 extern int get_nr_dirty_inodes(void);
 129 extern void evict_inodes(struct super_block *);
 130 extern int invalidate_inodes(struct super_block *, bool);