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