LXR linux/include/uapi/linux/romfs

   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[0];           /* 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[0];
  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