root/include/uapi/linux/romfs_fs.h

INCLUDED FROM

   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[0];           /* 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[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