1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* RomFS internal definitions
3 *
4 * Copyright © 2007 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8 #include <linux/romfs_fs.h>
9
10 struct romfs_inode_info {
11 struct inode vfs_inode;
12 unsigned long i_metasize; /* size of non-data area */
13 unsigned long i_dataoffset; /* from the start of fs */
14 };
15
16 static inline size_t romfs_maxsize(struct super_block *sb)
17 {
18 return (size_t) (unsigned long) sb->s_fs_info;
19 }
20
21 static inline struct romfs_inode_info *ROMFS_I(struct inode *inode)
22 {
23 return container_of(inode, struct romfs_inode_info, vfs_inode);
24 }
25
26 /*
27 * mmap-nommu.c
28 */
29 #if !defined(CONFIG_MMU) && defined(CONFIG_ROMFS_ON_MTD)
30 extern const struct file_operations romfs_ro_fops;
31 #else
32 #define romfs_ro_fops generic_ro_fops
33 #endif
34
35 /*
36 * storage.c
37 */
38 extern int romfs_dev_read(struct super_block *sb, unsigned long pos,
39 void *buf, size_t buflen);
40 extern ssize_t romfs_dev_strnlen(struct super_block *sb,
41 unsigned long pos, size_t maxlen);
42 extern int romfs_dev_strcmp(struct super_block *sb, unsigned long pos,
43 const char *str, size_t size);
44
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