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  * char_dev.c
  39  */
  40 extern void __init chrdev_init(void);
  41
  42 /*
  43  * namei.c
  44  */
  45 extern int __inode_permission(struct inode *, int);
  46 extern int user_path_mountpoint_at(int, const char __user *, unsigned int, struct path *);
  47 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
  48                            const char *, unsigned int, struct path *);
  49
  50 /*
  51  * namespace.c
  52  */
  53 extern int copy_mount_options(const void __user *, unsigned long *);
  54 extern int copy_mount_string(const void __user *, char **);
  55
  56 extern struct vfsmount *lookup_mnt(struct path *);
  57 extern int finish_automount(struct vfsmount *, struct path *);
  58
  59 extern int sb_prepare_remount_readonly(struct super_block *);
  60
  61 extern void __init mnt_init(void);
  62
  63 extern int __mnt_want_write(struct vfsmount *);
  64 extern int __mnt_want_write_file(struct file *);
  65 extern void __mnt_drop_write(struct vfsmount *);
  66 extern void __mnt_drop_write_file(struct file *);
  67
  68 /*
  69  * fs_struct.c
  70  */
  71 extern void chroot_fs_refs(const struct path *, const struct path *);
  72
  73 /*
  74  * file_table.c
  75  */
  76 extern struct file *get_empty_filp(void);
  77
  78 /*
  79  * super.c
  80  */
  81 extern int do_remount_sb(struct super_block *, int, void *, int);
  82 extern bool grab_super_passive(struct super_block *sb);
  83 extern struct dentry *mount_fs(struct file_system_type *,
  84                                int, const char *, void *);
  85 extern struct super_block *user_get_super(dev_t);
  86
  87 /*
  88  * open.c
  89  */
  90 struct open_flags {
  91         int open_flag;
  92         umode_t mode;
  93         int acc_mode;
  94         int intent;
  95         int lookup_flags;
  96 };
  97 extern struct file *do_filp_open(int dfd, struct filename *pathname,
  98                 const struct open_flags *op);
  99 extern struct file *do_file_open_root(struct dentry *, struct vfsmount *,
 100                 const char *, const struct open_flags *);
 101
 102 extern long do_handle_open(int mountdirfd,
 103                            struct file_handle __user *ufh, int open_flag);
 104 extern int open_check_o_direct(struct file *f);
 105
 106 /*
 107  * inode.c
 108  */
 109 extern spinlock_t inode_sb_list_lock;
 110 extern long prune_icache_sb(struct super_block *sb, unsigned long nr_to_scan,
 111                             int nid);
 112 extern void inode_add_lru(struct inode *inode);
 113
 114 /*
 115  * fs-writeback.c
 116  */
 117 extern void inode_wb_list_del(struct inode *inode);
 118
 119 extern long get_nr_dirty_inodes(void);
 120 extern void evict_inodes(struct super_block *);
 121 extern int invalidate_inodes(struct super_block *, bool);
 122
 123 /*
 124  * dcache.c
 125  */
 126 extern struct dentry *__d_alloc(struct super_block *, const struct qstr *);
 127 extern int d_set_mounted(struct dentry *dentry);
 128 extern long prune_dcache_sb(struct super_block *sb, unsigned long nr_to_scan,
 129                             int nid);
 130
 131 /*
 132  * read_write.c
 133  */
 134 extern ssize_t __kernel_write(struct file *, const char *, size_t, loff_t *);
 135 extern int rw_verify_area(int, struct file *, const loff_t *, size_t);
 136
 137 /*
 138  * splice.c
 139  */
 140 extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
 141                 loff_t *opos, size_t len, unsigned int flags);
 142
 143 /*
 144  * pipe.c
 145  */
 146 extern const struct file_operations pipefifo_fops;