blob: 06044a9dc62d4b740730dc74c068bc8e2751cf43 [file] [log] [blame]
David Howellsda4458b2009-02-12 10:40:10 +00001/* RomFS internal definitions
2 *
3 * Copyright © 2007 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/romfs_fs.h>
13
14struct romfs_inode_info {
15 struct inode vfs_inode;
16 unsigned long i_metasize; /* size of non-data area */
17 unsigned long i_dataoffset; /* from the start of fs */
18};
19
20static inline size_t romfs_maxsize(struct super_block *sb)
21{
22 return (size_t) (unsigned long) sb->s_fs_info;
23}
24
25static inline struct romfs_inode_info *ROMFS_I(struct inode *inode)
26{
27 return container_of(inode, struct romfs_inode_info, vfs_inode);
28}
29
30/*
31 * mmap-nommu.c
32 */
33#if !defined(CONFIG_MMU) && defined(CONFIG_ROMFS_ON_MTD)
34extern const struct file_operations romfs_ro_fops;
35#else
36#define romfs_ro_fops generic_ro_fops
37#endif
38
39/*
40 * storage.c
41 */
42extern int romfs_dev_read(struct super_block *sb, unsigned long pos,
43 void *buf, size_t buflen);
44extern ssize_t romfs_dev_strnlen(struct super_block *sb,
45 unsigned long pos, size_t maxlen);
46extern int romfs_dev_strncmp(struct super_block *sb, unsigned long pos,
47 const char *str, size_t size);