1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2#ifndef __LINUX_ROMFS_FS_H
3#define __LINUX_ROMFS_FS_H
4
5#include <linux/types.h>
6#include <linux/fs.h>
7
8/* The basic structures of the romfs filesystem */
9
10#define ROMBSIZE BLOCK_SIZE
11#define ROMBSBITS BLOCK_SIZE_BITS
12#define ROMBMASK (ROMBSIZE-1)
13#define ROMFS_MAGIC 0x7275
14
15#define ROMFS_MAXFN 128
16
17#define __mkw(h,l) (((h)&0x00ff)<< 8|((l)&0x00ff))
18#define __mkl(h,l) (((h)&0xffff)<<16|((l)&0xffff))
19#define __mk4(a,b,c,d) cpu_to_be32(__mkl(__mkw(a,b),__mkw(c,d)))
20#define ROMSB_WORD0 __mk4('-','r','o','m')
21#define ROMSB_WORD1 __mk4('1','f','s','-')
22
23/* On-disk "super block" */
24
25struct romfs_super_block {
26 __be32 word0;
27 __be32 word1;
28 __be32 size;
29 __be32 checksum;
30 char name[]; /* volume name */
31};
32
33/* On disk inode */
34
35struct romfs_inode {
36 __be32 next; /* low 4 bits see ROMFH_ */
37 __be32 spec;
38 __be32 size;
39 __be32 checksum;
40 char name[];
41};
42
43#define ROMFH_TYPE 7
44#define ROMFH_HRD 0
45#define ROMFH_DIR 1
46#define ROMFH_REG 2
47#define ROMFH_SYM 3
48#define ROMFH_BLK 4
49#define ROMFH_CHR 5
50#define ROMFH_SCK 6
51#define ROMFH_FIF 7
52#define ROMFH_EXEC 8
53
54/* Alignment */
55
56#define ROMFH_SIZE 16
57#define ROMFH_PAD (ROMFH_SIZE-1)
58#define ROMFH_MASK (~ROMFH_PAD)
59
60#endif
61