1 /* 2 * This program, created 2002-10-03 by Garrett A. Wollman 3 * <wollman@FreeBSD.org>, is in the public domain. Use at your own risk. 4 */ 5 6 /* 7 * Small extract from ufs/ffs/fs.h to get definition of superblock 8 * in order to make this tool portable to other unix-like systems. 9 * 10 * Based upon: 11 * 12 * FreeBSD: src/sys/ufs/ffs/fs.h,v 1.48 2005/02/20 08:02:15 delphij 13 * FreeBSD: src/sys/ufs/ufs/dinode.h,v 1.15 2005/01/07 02:29:26 imp 14 */ 15 16 #include <sys/types.h> 17 18 #define SBLOCKSIZE 8192 19 #define DEV_BSIZE (1<<9) 20 #define FS_UFS1_MAGIC 0x011954 21 #define FS_UFS2_MAGIC 0x19540119 22 #define SBLOCK_UFS1 8192 23 #define SBLOCK_UFS2 65536 24 #define MAXMNTLEN 468 25 #define MAXVOLLEN 32 26 #define NOCSPTRS ((128 / sizeof(void *)) - 4) 27 #define FSMAXSNAP 20 28 29 typedef int64_t ufs_time_t; 30 typedef int64_t ufs2_daddr_t; 31 32 struct csum { 33 int32_t cs_ndir; /* number of directories */ 34 int32_t cs_nbfree; /* number of free blocks */ 35 int32_t cs_nifree; /* number of free inodes */ 36 int32_t cs_nffree; /* number of free frags */ 37 }; 38 39 struct csum_total { 40 int64_t cs_ndir; /* number of directories */ 41 int64_t cs_nbfree; /* number of free blocks */ 42 int64_t cs_nifree; /* number of free inodes */ 43 int64_t cs_nffree; /* number of free frags */ 44 int64_t cs_numclusters; /* number of free clusters */ 45 int64_t cs_spare[3]; /* future expansion */ 46 }; 47 48 /* 49 * Super block for an FFS filesystem. 50 */ 51 struct fs { 52 int32_t fs_firstfield; /* historic filesystem linked list, */ 53 int32_t fs_unused_1; /* used for incore super blocks */ 54 int32_t fs_sblkno; /* offset of super-block in filesys */ 55 int32_t fs_cblkno; /* offset of cyl-block in filesys */ 56 int32_t fs_iblkno; /* offset of inode-blocks in filesys */ 57 int32_t fs_dblkno; /* offset of first data after cg */ 58 int32_t fs_old_cgoffset; /* cylinder group offset in cylinder */ 59 int32_t fs_old_cgmask; /* used to calc mod fs_ntrak */ 60 int32_t fs_old_time; /* last time written */ 61 int32_t fs_old_size; /* number of blocks in fs */ 62 int32_t fs_old_dsize; /* number of data blocks in fs */ 63 int32_t fs_ncg; /* number of cylinder groups */ 64 int32_t fs_bsize; /* size of basic blocks in fs */ 65 int32_t fs_fsize; /* size of frag blocks in fs */ 66 int32_t fs_frag; /* number of frags in a block in fs */ 67 /* these are configuration parameters */ 68 int32_t fs_minfree; /* minimum percentage of free blocks */ 69 int32_t fs_old_rotdelay; /* num of ms for optimal next block */ 70 int32_t fs_old_rps; /* disk revolutions per second */ 71 /* these fields can be computed from the others */ 72 int32_t fs_bmask; /* ``blkoff'' calc of blk offsets */ 73 int32_t fs_fmask; /* ``fragoff'' calc of frag offsets */ 74 int32_t fs_bshift; /* ``lblkno'' calc of logical blkno */ 75 int32_t fs_fshift; /* ``numfrags'' calc number of frags */ 76 /* these are configuration parameters */ 77 int32_t fs_maxcontig; /* max number of contiguous blks */ 78 int32_t fs_maxbpg; /* max number of blks per cyl group */ 79 /* these fields can be computed from the others */ 80 int32_t fs_fragshift; /* block to frag shift */ 81 int32_t fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */ 82 int32_t fs_sbsize; /* actual size of super block */ 83 int32_t fs_spare1[2]; /* old fs_csmask */ 84 /* old fs_csshift */ 85 int32_t fs_nindir; /* value of NINDIR */ 86 int32_t fs_inopb; /* value of INOPB */ 87 int32_t fs_old_nspf; /* value of NSPF */ 88 /* yet another configuration parameter */ 89 int32_t fs_optim; /* optimization preference, see below */ 90 int32_t fs_old_npsect; /* # sectors/track including spares */ 91 int32_t fs_old_interleave; /* hardware sector interleave */ 92 int32_t fs_old_trackskew; /* sector 0 skew, per track */ 93 int32_t fs_id[2]; /* unique filesystem id */ 94 /* sizes determined by number of cylinder groups and their sizes */ 95 int32_t fs_old_csaddr; /* blk addr of cyl grp summary area */ 96 int32_t fs_cssize; /* size of cyl grp summary area */ 97 int32_t fs_cgsize; /* cylinder group size */ 98 int32_t fs_spare2; /* old fs_ntrak */ 99 int32_t fs_old_nsect; /* sectors per track */ 100 int32_t fs_old_spc; /* sectors per cylinder */ 101 int32_t fs_old_ncyl; /* cylinders in filesystem */ 102 int32_t fs_old_cpg; /* cylinders per group */ 103 int32_t fs_ipg; /* inodes per group */ 104 int32_t fs_fpg; /* blocks per group * fs_frag */ 105 /* this data must be re-computed after crashes */ 106 struct csum fs_old_cstotal; /* cylinder summary information */ 107 /* these fields are cleared at mount time */ 108 int8_t fs_fmod; /* super block modified flag */ 109 int8_t fs_clean; /* filesystem is clean flag */ 110 int8_t fs_ronly; /* mounted read-only flag */ 111 int8_t fs_old_flags; /* old FS_ flags */ 112 u_char fs_fsmnt[MAXMNTLEN]; /* name mounted on */ 113 u_char fs_volname[MAXVOLLEN]; /* volume name */ 114 u_int64_t fs_swuid; /* system-wide uid */ 115 int32_t fs_pad; /* due to alignment of fs_swuid */ 116 /* these fields retain the current block allocation info */ 117 int32_t fs_cgrotor; /* last cg searched */ 118 void *fs_ocsp[NOCSPTRS]; /* padding; was list of fs_cs buffers */ 119 u_int8_t *fs_contigdirs; /* (u) # of contig. allocated dirs */ 120 struct csum *fs_csp; /* (u) cg summary info buffer */ 121 int32_t *fs_maxcluster; /* (u) max cluster in each cyl group */ 122 u_int *fs_active; /* (u) used by snapshots to track fs */ 123 int32_t fs_old_cpc; /* cyl per cycle in postbl */ 124 int32_t fs_maxbsize; /* maximum blocking factor permitted */ 125 int64_t fs_unrefs; /* number of unreferenced inodes */ 126 int64_t fs_sparecon64[16]; /* old rotation block list head */ 127 int64_t fs_sblockloc; /* byte offset of standard superblock */ 128 struct csum_total fs_cstotal; /* (u) cylinder summary information */ 129 ufs_time_t fs_time; /* last time written */ 130 int64_t fs_size; /* number of blocks in fs */ 131 int64_t fs_dsize; /* number of data blocks in fs */ 132 ufs2_daddr_t fs_csaddr; /* blk addr of cyl grp summary area */ 133 int64_t fs_pendingblocks; /* (u) blocks being freed */ 134 int32_t fs_pendinginodes; /* (u) inodes being freed */ 135 int32_t fs_snapinum[FSMAXSNAP];/* list of snapshot inode numbers */ 136 int32_t fs_avgfilesize; /* expected average file size */ 137 int32_t fs_avgfpdir; /* expected # of files per directory */ 138 int32_t fs_save_cgsize; /* save real cg size to use fs_bsize */ 139 int32_t fs_sparecon32[26]; /* reserved for future constants */ 140 int32_t fs_flags; /* see FS_ flags below */ 141 int32_t fs_contigsumsize; /* size of cluster summary array */ 142 int32_t fs_maxsymlinklen; /* max length of an internal symlink */ 143 int32_t fs_old_inodefmt; /* format of on-disk inodes */ 144 u_int64_t fs_maxfilesize; /* maximum representable file size */ 145 int64_t fs_qbmask; /* ~fs_bmask for use with 64-bit size */ 146 int64_t fs_qfmask; /* ~fs_fmask for use with 64-bit size */ 147 int32_t fs_state; /* validate fs_clean field */ 148 int32_t fs_old_postblformat; /* format of positional layout tables */ 149 int32_t fs_old_nrpos; /* number of rotational positions */ 150 int32_t fs_spare5[2]; /* old fs_postbloff */ 151 /* old fs_rotbloff */ 152 int32_t fs_magic; /* magic number */ 153 }; 154