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Linux/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 iomap;
 15 struct iomap_ops;
 16 struct linux_binprm;
 17 struct path;
 18 struct mount;
 19 struct shrink_control;
 20 
 21 /*
 22  * block_dev.c
 23  */
 24 #ifdef CONFIG_BLOCK
 25 extern void __init bdev_cache_init(void);
 26 
 27 extern int __sync_blockdev(struct block_device *bdev, int wait);
 28 
 29 #else
 30 static inline void bdev_cache_init(void)
 31 {
 32 }
 33 
 34 static inline int __sync_blockdev(struct block_device *bdev, int wait)
 35 {
 36         return 0;
 37 }
 38 #endif
 39 
 40 /*
 41  * buffer.c
 42  */
 43 extern void guard_bio_eod(int rw, struct bio *bio);
 44 extern int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
 45                 get_block_t *get_block, struct iomap *iomap);
 46 
 47 /*
 48  * char_dev.c
 49  */
 50 extern void __init chrdev_init(void);
 51 
 52 /*
 53  * namei.c
 54  */
 55 extern int user_path_mountpoint_at(int, const char __user *, unsigned int, struct path *);
 56 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
 57                            const char *, unsigned int, struct path *);
 58 
 59 /*
 60  * namespace.c
 61  */
 62 extern void *copy_mount_options(const void __user *);
 63 extern char *copy_mount_string(const void __user *);
 64 
 65 extern struct vfsmount *lookup_mnt(const struct path *);
 66 extern int finish_automount(struct vfsmount *, struct path *);
 67 
 68 extern int sb_prepare_remount_readonly(struct super_block *);
 69 
 70 extern void __init mnt_init(void);
 71 
 72 extern int __mnt_want_write(struct vfsmount *);
 73 extern int __mnt_want_write_file(struct file *);
 74 extern void __mnt_drop_write(struct vfsmount *);
 75 extern void __mnt_drop_write_file(struct file *);
 76 
 77 /*
 78  * fs_struct.c
 79  */
 80 extern void chroot_fs_refs(const struct path *, const struct path *);
 81 
 82 /*
 83  * file_table.c
 84  */
 85 extern struct file *get_empty_filp(void);
 86 
 87 /*
 88  * super.c
 89  */
 90 extern int do_remount_sb(struct super_block *, int, void *, int);
 91 extern bool trylock_super(struct super_block *sb);
 92 extern struct dentry *mount_fs(struct file_system_type *,
 93                                int, const char *, void *);
 94 extern struct super_block *user_get_super(dev_t);
 95 
 96 /*
 97  * open.c
 98  */
 99 struct open_flags {
100         int open_flag;
101         umode_t mode;
102         int acc_mode;
103         int intent;
104         int lookup_flags;
105 };
106 extern struct file *do_filp_open(int dfd, struct filename *pathname,
107                 const struct open_flags *op);
108 extern struct file *do_file_open_root(struct dentry *, struct vfsmount *,
109                 const char *, const struct open_flags *);
110 
111 extern long do_handle_open(int mountdirfd,
112                            struct file_handle __user *ufh, int open_flag);
113 extern int open_check_o_direct(struct file *f);
114 extern int vfs_open(const struct path *, struct file *, const struct cred *);
115 extern struct file *filp_clone_open(struct file *);
116 
117 /*
118  * inode.c
119  */
120 extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
121 extern void inode_add_lru(struct inode *inode);
122 extern int dentry_needs_remove_privs(struct dentry *dentry);
123 
124 extern bool __atime_needs_update(const struct path *, struct inode *, bool);
125 static inline bool atime_needs_update_rcu(const struct path *path,
126                                           struct inode *inode)
127 {
128         return __atime_needs_update(path, inode, true);
129 }
130 
131 extern bool atime_needs_update_rcu(const struct path *, struct inode *);
132 
133 /*
134  * fs-writeback.c
135  */
136 extern void inode_io_list_del(struct inode *inode);
137 
138 extern long get_nr_dirty_inodes(void);
139 extern void evict_inodes(struct super_block *);
140 extern int invalidate_inodes(struct super_block *, bool);
141 
142 /*
143  * dcache.c
144  */
145 extern struct dentry *__d_alloc(struct super_block *, const struct qstr *);
146 extern int d_set_mounted(struct dentry *dentry);
147 extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
148 extern struct dentry *d_alloc_cursor(struct dentry *);
149 
150 /*
151  * read_write.c
152  */
153 extern int rw_verify_area(int, struct file *, const loff_t *, size_t);
154 
155 /*
156  * pipe.c
157  */
158 extern const struct file_operations pipefifo_fops;
159 
160 /*
161  * fs_pin.c
162  */
163 extern void group_pin_kill(struct hlist_head *p);
164 extern void mnt_pin_kill(struct mount *m);
165 
166 /*
167  * fs/nsfs.c
168  */
169 extern const struct dentry_operations ns_dentry_operations;
170 
171 /*
172  * fs/ioctl.c
173  */
174 extern int do_vfs_ioctl(struct file *file, unsigned int fd, unsigned int cmd,
175                     unsigned long arg);
176 extern long vfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
177 
178 /*
179  * iomap support:
180  */
181 typedef loff_t (*iomap_actor_t)(struct inode *inode, loff_t pos, loff_t len,
182                 void *data, struct iomap *iomap);
183 
184 loff_t iomap_apply(struct inode *inode, loff_t pos, loff_t length,
185                 unsigned flags, struct iomap_ops *ops, void *data,
186                 iomap_actor_t actor);
187 
188 /* direct-io.c: */
189 int sb_init_dio_done_wq(struct super_block *sb);
190 

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