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 linux_binprm;
  15 struct path;
  16 struct mount;
  17
  18 /*
  19  * block_dev.c
  20  */
  21 #ifdef CONFIG_BLOCK
  22 extern void __init bdev_cache_init(void);
  23
  24 extern int __sync_blockdev(struct block_device *bdev, int wait);
  25
  26 #else
  27 static inline void bdev_cache_init(void)
  28 {
  29 }
  30
  31 static inline int __sync_blockdev(struct block_device *bdev, int wait)
  32 {
  33         return 0;
  34 }
  35 #endif
  36
  37 /*
  38  * buffer.c
  39  */
  40 extern void guard_bio_eod(int rw, struct bio *bio);
  41
  42 /*
  43  * char_dev.c
  44  */
  45 extern void __init chrdev_init(void);
  46
  47 /*
  48  * namei.c
  49  */
  50 extern int user_path_mountpoint_at(int, const char __user *, unsigned int, struct path *);
  51 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
  52                            const char *, unsigned int, struct path *);
  53
  54 /*
  55  * namespace.c
  56  */
  57 extern int copy_mount_options(const void __user *, unsigned long *);
  58 extern char *copy_mount_string(const void __user *);
  59
  60 extern struct vfsmount *lookup_mnt(struct path *);
  61 extern int finish_automount(struct vfsmount *, struct path *);
  62
  63 extern int sb_prepare_remount_readonly(struct super_block *);
  64
  65 extern void __init mnt_init(void);
  66
  67 extern int __mnt_want_write(struct vfsmount *);
  68 extern int __mnt_want_write_file(struct file *);
  69 extern void __mnt_drop_write(struct vfsmount *);
  70 extern void __mnt_drop_write_file(struct file *);
  71
  72 /*
  73  * fs_struct.c
  74  */
  75 extern void chroot_fs_refs(const struct path *, const struct path *);
  76
  77 /*
  78  * file_table.c
  79  */
  80 extern struct file *get_empty_filp(void);
  81
  82 /*
  83  * super.c
  84  */
  85 extern int do_remount_sb(struct super_block *, int, void *, int);
  86 extern bool grab_super_passive(struct super_block *sb);
  87 extern struct dentry *mount_fs(struct file_system_type *,
  88                                int, const char *, void *);
  89 extern struct super_block *user_get_super(dev_t);
  90
  91 /*
  92  * open.c
  93  */
  94 struct open_flags {
  95         int open_flag;
  96         umode_t mode;
  97         int acc_mode;
  98         int intent;
  99         int lookup_flags;
 100 };
 101 extern struct file *do_filp_open(int dfd, struct filename *pathname,
 102                 const struct open_flags *op);
 103 extern struct file *do_file_open_root(struct dentry *, struct vfsmount *,
 104                 const char *, const struct open_flags *);
 105
 106 extern long do_handle_open(int mountdirfd,
 107                            struct file_handle __user *ufh, int open_flag);
 108 extern int open_check_o_direct(struct file *f);
 109 extern int vfs_open(const struct path *, struct file *, const struct cred *);
 110
 111 /*
 112  * inode.c
 113  */
 114 extern spinlock_t inode_sb_list_lock;
 115 extern long prune_icache_sb(struct super_block *sb, unsigned long nr_to_scan,
 116                             int nid);
 117 extern void inode_add_lru(struct inode *inode);
 118
 119 /*
 120  * fs-writeback.c
 121  */
 122 extern void inode_wb_list_del(struct inode *inode);
 123
 124 extern long get_nr_dirty_inodes(void);
 125 extern void evict_inodes(struct super_block *);
 126 extern int invalidate_inodes(struct super_block *, bool);
 127
 128 /*
 129  * dcache.c
 130  */
 131 extern struct dentry *__d_alloc(struct super_block *, const struct qstr *);
 132 extern int d_set_mounted(struct dentry *dentry);
 133 extern long prune_dcache_sb(struct super_block *sb, unsigned long nr_to_scan,
 134                             int nid);
 135
 136 /*
 137  * read_write.c
 138  */
 139 extern int rw_verify_area(int, struct file *, const loff_t *, size_t);
 140
 141 /*
 142  * pipe.c
 143  */
 144 extern const struct file_operations pipefifo_fops;
 145
 146 /*
 147  * fs_pin.c
 148  */
 149 extern void sb_pin_kill(struct super_block *sb);
 150 extern void mnt_pin_kill(struct mount *m);