1 /* 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
14 struct 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
romfs_maxsize(struct super_block * sb)20 static inline size_t romfs_maxsize(struct super_block *sb)
21 {
22 return (size_t) (unsigned long) sb->s_fs_info;
23 }
24
ROMFS_I(struct inode * inode)25 static 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)
34 extern 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 */
42 extern int romfs_dev_read(struct super_block *sb, unsigned long pos,
43 void *buf, size_t buflen);
44 extern ssize_t romfs_dev_strnlen(struct super_block *sb,
45 unsigned long pos, size_t maxlen);
46 extern int romfs_dev_strcmp(struct super_block *sb, unsigned long pos,
47 const char *str, size_t size);
48
