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