1 /* $NetBSD: efs_sb.h,v 1.1 2007/06/29 23:30:29 rumble Exp $ */ 2 3 /* 4 * Copyright (c) 2006 Stephen M. Rumble <rumble@ephemeral.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 /* 20 * See IRIX efs(4) 21 */ 22 23 #ifndef _FS_EFS_EFS_SB_H_ 24 #define _FS_EFS_EFS_SB_H_ 25 26 /* 27 * EFS superblock (92 bytes) 28 * 29 * Notes: 30 * [0] - Values can either be EFS_SB_MAGIC, or EFS_SB_NEWMAGIC (IRIX 3.3+). 31 * [1] - Only used in a grown filesystem. Original bitmap is unused. 32 * [2] - Only exists in IRIX3.3+. (XXX - IRIX man pages say 3.3+ fsck 33 * creates a replicated superblock if space free. Does it update magic?) 34 * [3] - According to IRIX kernel elf headers, two checksum routines exist. 35 * [4] - New at some point (in IRIX 5, but apparently not in IRIX 4). 36 */ 37 struct efs_sb { 38 int32_t sb_size; /* 0: fs size incl. bb 0 (in bb) */ 39 int32_t sb_firstcg; /* 4: first cg offset (in bb) */ 40 int32_t sb_cgfsize; /* 8: cg size (in bb) */ 41 int16_t sb_cgisize; /* 12: inodes/cg (in bb) */ 42 int16_t sb_sectors; /* 14: geom: sectors/track */ 43 int16_t sb_heads; /* 16: geom: heads/cylinder (unused) */ 44 int16_t sb_ncg; /* 18: num of cg's in the filesystem */ 45 int16_t sb_dirty; /* 20: non-0 indicates fsck required */ 46 int16_t sb_pad0; /* 22: */ 47 int32_t sb_time; /* 24: superblock ctime */ 48 int32_t sb_magic; /* 28: magic [0] */ 49 char sb_fname[6]; /* 32: name of filesystem */ 50 char sb_fpack[6]; /* 38: name of filesystem pack */ 51 int32_t sb_bmsize; /* 44: bitmap size (in bytes) */ 52 int32_t sb_tfree; /* 48: total free data blocks */ 53 int32_t sb_tinode; /* 52: total free inodes */ 54 int32_t sb_bmblock; /* 56: bitmap offset (grown fs) [1] */ 55 int32_t sb_replsb; /* 62: repl. superblock offset [2] */ 56 int32_t sb_lastinode; /* 64: last allocated inode [4] */ 57 int8_t sb_spare[20]; /* 68: unused */ 58 int32_t sb_checksum; /* 88: checksum (all above) [3] */ 59 } __packed; 60 61 #define EFS_SB_SIZE (sizeof(struct efs_sb)) 62 #define EFS_SB_CHECKSUM_SIZE (EFS_SB_SIZE - 4) 63 64 #define EFS_SB_MAGIC 0x00072959 /* original, ungrown layout */ 65 #define EFS_SB_NEWMAGIC 0x0007295A /* grown fs (IRIX >= 3.3) */ 66 67 /* sb_dirty values */ 68 #define EFS_SB_CLEAN 0 /* filesystem is clean */ 69 70 #endif /* !_FS_EFS_EFS_SB_H_ */ 71