linux/fs/internal.h
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   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
  14struct super_block;
  15struct file_system_type;
  16struct linux_binprm;
  17struct path;
  18struct mount;
  19
  20/*
  21 * block_dev.c
  22 */
  23#ifdef CONFIG_BLOCK
  24extern void __init bdev_cache_init(void);
  25
  26extern int __sync_blockdev(struct block_device *bdev, int wait);
  27
  28#else
  29static inline void bdev_cache_init(void)
  30{
  31}
  32
  33static inline int __sync_blockdev(struct block_device *bdev, int wait)
  34{
  35        return 0;
  36}
  37#endif
  38
  39/*
  40 * char_dev.c
  41 */
  42extern void __init chrdev_init(void);
  43
  44/*
  45 * namei.c
  46 */
  47extern int __inode_permission(struct inode *, int);
  48extern int user_path_mountpoint_at(int, const char __user *, unsigned int, struct path *);
  49extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
  50                           const char *, unsigned int, struct path *);
  51
  52/*
  53 * namespace.c
  54 */
  55extern int copy_mount_options(const void __user *, unsigned long *);
  56extern int copy_mount_string(const void __user *, char **);
  57
  58extern struct vfsmount *lookup_mnt(struct path *);
  59extern int finish_automount(struct vfsmount *, struct path *);
  60
  61extern int sb_prepare_remount_readonly(struct super_block *);
  62
  63extern void __init mnt_init(void);
  64
  65extern struct lglock vfsmount_lock;
  66
  67extern int __mnt_want_write(struct vfsmount *);
  68extern int __mnt_want_write_file(struct file *);
  69extern void __mnt_drop_write(struct vfsmount *);
  70extern void __mnt_drop_write_file(struct file *);
  71
  72/*
  73 * fs_struct.c
  74 */
  75extern void chroot_fs_refs(const struct path *, const struct path *);
  76
  77/*
  78 * file_table.c
  79 */
  80extern void file_sb_list_add(struct file *f, struct super_block *sb);
  81extern void file_sb_list_del(struct file *f);
  82extern void mark_files_ro(struct super_block *);
  83extern struct file *get_empty_filp(void);
  84
  85/*
  86 * super.c
  87 */
  88extern int do_remount_sb(struct super_block *, int, void *, int);
  89extern bool grab_super_passive(struct super_block *sb);
  90extern struct dentry *mount_fs(struct file_system_type *,
  91                               int, const char *, void *);
  92extern struct super_block *user_get_super(dev_t);
  93
  94/*
  95 * open.c
  96 */
  97struct open_flags {
  98        int open_flag;
  99        umode_t mode;
 100        int acc_mode;
 101        int intent;
 102        int lookup_flags;
 103};
 104extern struct file *do_filp_open(int dfd, struct filename *pathname,
 105                const struct open_flags *op);
 106extern struct file *do_file_open_root(struct dentry *, struct vfsmount *,
 107                const char *, const struct open_flags *);
 108
 109extern long do_handle_open(int mountdirfd,
 110                           struct file_handle __user *ufh, int open_flag);
 111extern int open_check_o_direct(struct file *f);
 112
 113/*
 114 * inode.c
 115 */
 116extern spinlock_t inode_sb_list_lock;
 117extern long prune_icache_sb(struct super_block *sb, unsigned long nr_to_scan,
 118                            int nid);
 119extern void inode_add_lru(struct inode *inode);
 120
 121/*
 122 * fs-writeback.c
 123 */
 124extern void inode_wb_list_del(struct inode *inode);
 125
 126extern long get_nr_dirty_inodes(void);
 127extern void evict_inodes(struct super_block *);
 128extern int invalidate_inodes(struct super_block *, bool);
 129
 130/*
 131 * dcache.c
 132 */
 133extern struct dentry *__d_alloc(struct super_block *, const struct qstr *);
 134extern int d_set_mounted(struct dentry *dentry);
 135extern long prune_dcache_sb(struct super_block *sb, unsigned long nr_to_scan,
 136                            int nid);
 137
 138/*
 139 * read_write.c
 140 */
 141extern ssize_t __kernel_write(struct file *, const char *, size_t, loff_t *);
 142extern int rw_verify_area(int, struct file *, const loff_t *, size_t);
 143
 144/*
 145 * splice.c
 146 */
 147extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
 148                loff_t *opos, size_t len, unsigned int flags);
 149
 150/*
 151 * pipe.c
 152 */
 153extern const struct file_operations pipefifo_fops;
 154
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