1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-or-later */
2*4882a593Smuzhiyun /* RomFS internal definitions
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Copyright © 2007 Red Hat, Inc. All Rights Reserved.
5*4882a593Smuzhiyun * Written by David Howells (dhowells@redhat.com)
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <linux/romfs_fs.h>
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun struct romfs_inode_info {
11*4882a593Smuzhiyun struct inode vfs_inode;
12*4882a593Smuzhiyun unsigned long i_metasize; /* size of non-data area */
13*4882a593Smuzhiyun unsigned long i_dataoffset; /* from the start of fs */
14*4882a593Smuzhiyun };
15*4882a593Smuzhiyun
romfs_maxsize(struct super_block * sb)16*4882a593Smuzhiyun static inline size_t romfs_maxsize(struct super_block *sb)
17*4882a593Smuzhiyun {
18*4882a593Smuzhiyun return (size_t) (unsigned long) sb->s_fs_info;
19*4882a593Smuzhiyun }
20*4882a593Smuzhiyun
ROMFS_I(struct inode * inode)21*4882a593Smuzhiyun static inline struct romfs_inode_info *ROMFS_I(struct inode *inode)
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun return container_of(inode, struct romfs_inode_info, vfs_inode);
24*4882a593Smuzhiyun }
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun /*
27*4882a593Smuzhiyun * mmap-nommu.c
28*4882a593Smuzhiyun */
29*4882a593Smuzhiyun #if !defined(CONFIG_MMU) && defined(CONFIG_ROMFS_ON_MTD)
30*4882a593Smuzhiyun extern const struct file_operations romfs_ro_fops;
31*4882a593Smuzhiyun #else
32*4882a593Smuzhiyun #define romfs_ro_fops generic_ro_fops
33*4882a593Smuzhiyun #endif
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun /*
36*4882a593Smuzhiyun * storage.c
37*4882a593Smuzhiyun */
38*4882a593Smuzhiyun extern int romfs_dev_read(struct super_block *sb, unsigned long pos,
39*4882a593Smuzhiyun void *buf, size_t buflen);
40*4882a593Smuzhiyun extern ssize_t romfs_dev_strnlen(struct super_block *sb,
41*4882a593Smuzhiyun unsigned long pos, size_t maxlen);
42*4882a593Smuzhiyun extern int romfs_dev_strcmp(struct super_block *sb, unsigned long pos,
43*4882a593Smuzhiyun const char *str, size_t size);
44