uapi/linux/romfs_fs.h

0001 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
0002 #ifndef __LINUX_ROMFS_FS_H
0003 #define __LINUX_ROMFS_FS_H
0004
0005 #include <linux/types.h>
0006 #include <linux/fs.h>
0007
0008 /* The basic structures of the romfs filesystem */
0009
0010 #define ROMBSIZE BLOCK_SIZE
0011 #define ROMBSBITS BLOCK_SIZE_BITS
0012 #define ROMBMASK (ROMBSIZE-1)
0013 #define ROMFS_MAGIC 0x7275
0014
0015 #define ROMFS_MAXFN 128
0016
0017 #define __mkw(h,l) (((h)&0x00ff)<< 8|((l)&0x00ff))
0018 #define __mkl(h,l) (((h)&0xffff)<<16|((l)&0xffff))
0019 #define __mk4(a,b,c,d) cpu_to_be32(__mkl(__mkw(a,b),__mkw(c,d)))
0020 #define ROMSB_WORD0 __mk4('-','r','o','m')
0021 #define ROMSB_WORD1 __mk4('1','f','s','-')
0022
0023 /* On-disk "super block" */
0024
0025 struct romfs_super_block {
0026     __be32 word0;
0027     __be32 word1;
0028     __be32 size;
0029     __be32 checksum;
0030     char name[];        /* volume name */
0031 };
0032
0033 /* On disk inode */
0034
0035 struct romfs_inode {
0036     __be32 next;        /* low 4 bits see ROMFH_ */
0037     __be32 spec;
0038     __be32 size;
0039     __be32 checksum;
0040     char name[];
0041 };
0042
0043 #define ROMFH_TYPE 7
0044 #define ROMFH_HRD 0
0045 #define ROMFH_DIR 1
0046 #define ROMFH_REG 2
0047 #define ROMFH_SYM 3
0048 #define ROMFH_BLK 4
0049 #define ROMFH_CHR 5
0050 #define ROMFH_SCK 6
0051 #define ROMFH_FIF 7
0052 #define ROMFH_EXEC 8
0053
0054 /* Alignment */
0055
0056 #define ROMFH_SIZE 16
0057 #define ROMFH_PAD (ROMFH_SIZE-1)
0058 #define ROMFH_MASK (~ROMFH_PAD)
0059
0060 #endif