1 /* 2 * efs_vh.h 3 * 4 * Copyright (c) 1999 Al Smith 5 * 6 * Portions derived from IRIX header files (c) 1985 MIPS Computer Systems, Inc. 7 */ 8 9 #ifndef __EFS_VH_H__ 10 #define __EFS_VH_H__ 11 12 #define VHMAGIC 0xbe5a941 /* volume header magic number */ 13 #define NPARTAB 16 /* 16 unix partitions */ 14 #define NVDIR 15 /* max of 15 directory entries */ 15 #define BFNAMESIZE 16 /* max 16 chars in boot file name */ 16 #define VDNAMESIZE 8 17 18 struct volume_directory { 19 char vd_name[VDNAMESIZE]; /* name */ 20 __be32 vd_lbn; /* logical block number */ 21 __be32 vd_nbytes; /* file length in bytes */ 22 }; 23 24 struct partition_table { /* one per logical partition */ 25 __be32 pt_nblks; /* # of logical blks in partition */ 26 __be32 pt_firstlbn; /* first lbn of partition */ 27 __be32 pt_type; /* use of partition */ 28 }; 29 30 struct volume_header { 31 __be32 vh_magic; /* identifies volume header */ 32 __be16 vh_rootpt; /* root partition number */ 33 __be16 vh_swappt; /* swap partition number */ 34 char vh_bootfile[BFNAMESIZE]; /* name of file to boot */ 35 char pad[48]; /* device param space */ 36 struct volume_directory vh_vd[NVDIR]; /* other vol hdr contents */ 37 struct partition_table vh_pt[NPARTAB]; /* device partition layout */ 38 __be32 vh_csum; /* volume header checksum */ 39 __be32 vh_fill; /* fill out to 512 bytes */ 40 }; 41 42 /* partition type sysv is used for EFS format CD-ROM partitions */ 43 #define SGI_SYSV 0x05 44 #define SGI_EFS 0x07 45 #define IS_EFS(x) (((x) == SGI_EFS) || ((x) == SGI_SYSV)) 46 47 struct pt_types { 48 int pt_type; 49 char *pt_name; 50 }; 51 52 #endif /* __EFS_VH_H__ */ 53 54