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
25 struct 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
35 struct 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
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