X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/blobdiff_plain/1b807fc9f7215a82bb57f73c04adfc2183590cd4..ad30fb672122d5a4daba6642b8a6075e44df7af5:/usr/src/sys/ufs/ffs/fs.h?ds=inline diff --git a/usr/src/sys/ufs/ffs/fs.h b/usr/src/sys/ufs/ffs/fs.h index ff768fb4a9..ba0a3494fc 100644 --- a/usr/src/sys/ufs/ffs/fs.h +++ b/usr/src/sys/ufs/ffs/fs.h @@ -1,6 +1,6 @@ /* Copyright (c) 1981 Regents of the University of California */ -/* fs.h 1.16 %G% */ +/* fs.h 2.3 4/12/82 */ /* * Each disk drive contains some number of file systems. @@ -16,7 +16,6 @@ * * For file system fs, the offsets of the various blocks of interest * are given in the super block as: - * [fs->fs_bblkno] Boot sector * [fs->fs_sblkno] Super-block * [fs->fs_cblkno] Cylinder group block * [fs->fs_iblkno] Inode blocks @@ -26,7 +25,7 @@ * * The first boot and super blocks are given in absolute disk addresses. */ -#define BBSIZE 1024 +#define BBSIZE 8192 #define SBSIZE 8192 #define BBLOCK ((daddr_t)(0)) #define SBLOCK ((daddr_t)(BBLOCK + BBSIZE / DEV_BSIZE)) @@ -80,11 +79,11 @@ /* * Under current technology, most 300MB disks have 32 sectors and - * 19 tracks, thus these are the defaults used for fs_nsect and + * 16 tracks, thus these are the defaults used for fs_nsect and * fs_ntrak respectively. */ #define DFLNSECT 32 -#define DFLNTRAK 19 +#define DFLNTRAK 16 /* * Cylinder group related limits. @@ -138,11 +137,11 @@ * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in * the super block for this name. * The limit on the amount of summary information per file system - * is defined by MAXCSBUFS. It is currently parameterized for 1Meg - * cylinders maximum. + * is defined by MAXCSBUFS. It is currently parameterized for a + * maximum of two million cylinders. */ -#define MAXMNTLEN 34 -#define MAXCSBUFS 16 +#define MAXMNTLEN 512 +#define MAXCSBUFS 32 /* * Per cylinder group information; summarized in blocks allocated @@ -163,54 +162,60 @@ struct csum { /* * Super block for a file system. */ -#define FS_MAGIC 0x110854 +#define FS_MAGIC 0x011954 struct fs { - long fs_magic; /* magic number */ - daddr_t fs_bblkno; /* abs addr of boot-block in filesys */ - daddr_t fs_sblkno; /* abs addr of super-block in filesys */ + struct fs *fs_link; /* linked list of file systems */ + struct fs *fs_rlink; /* used for incore super blocks */ + daddr_t fs_sblkno; /* addr of super-block in filesys */ daddr_t fs_cblkno; /* offset of cyl-block in filesys */ daddr_t fs_iblkno; /* offset of inode-blocks in filesys */ - daddr_t fs_dblkno; /* offset of data-blocks in filesys */ + daddr_t fs_dblkno; /* offset of first data after cg */ + long fs_cgoffset; /* cylinder group offset in cylinder */ + long fs_cgmask; /* used to calc mod fs_ntrak */ time_t fs_time; /* last time written */ long fs_size; /* number of blocks in fs */ long fs_dsize; /* number of data blocks in fs */ long fs_ncg; /* number of cylinder groups */ long fs_bsize; /* size of basic blocks in fs */ long fs_fsize; /* size of frag blocks in fs */ - short fs_frag; /* number of frags in a block in fs */ - short fs_minfree; /* minimum percentage of free blocks */ - short fs_rotdelay; /* num of ms for optimal next block */ - short fs_rps; /* disk revolutions per second */ + long fs_frag; /* number of frags in a block in fs */ + long fs_minfree; /* minimum percentage of free blocks */ + long fs_rotdelay; /* num of ms for optimal next block */ + long fs_rps; /* disk revolutions per second */ long fs_bmask; /* ``blkoff'' calc of blk offsets */ long fs_fmask; /* ``fragoff'' calc of frag offsets */ - short fs_bshift; /* ``lblkno'' calc of logical blkno */ - short fs_fshift; /* ``numfrags'' calc number of frags */ + long fs_bshift; /* ``lblkno'' calc of logical blkno */ + long fs_fshift; /* ``numfrags'' calc number of frags */ + long fs_sparecon[16]; /* reserved for future constants */ /* sizes determined by number of cylinder groups and their sizes */ daddr_t fs_csaddr; /* blk addr of cyl grp summary area */ long fs_cssize; /* size of cyl grp summary area */ long fs_cgsize; /* cylinder group size */ /* these fields should be derived from the hardware */ - short fs_ntrak; /* tracks per cylinder */ - short fs_nsect; /* sectors per track */ + long fs_ntrak; /* tracks per cylinder */ + long fs_nsect; /* sectors per track */ long fs_spc; /* sectors per cylinder */ /* this comes from the disk driver partitioning */ long fs_ncyl; /* cylinders in file system */ /* these fields can be computed from the others */ - short fs_cpg; /* cylinders per group */ - short fs_ipg; /* inodes per group */ + long fs_cpg; /* cylinders per group */ + long fs_ipg; /* inodes per group */ long fs_fpg; /* blocks per group * fs_frag */ /* this data must be re-computed after crashes */ struct csum fs_cstotal; /* cylinder summary information */ /* these fields are cleared at mount time */ char fs_fmod; /* super block modified flag */ + char fs_clean; /* file system is clean flag */ char fs_ronly; /* mounted read-only flag */ + char fs_flags; /* currently unused flag */ char fs_fsmnt[MAXMNTLEN]; /* name mounted on */ /* these fields retain the current block allocation info */ long fs_cgrotor; /* last cg searched */ struct csum *fs_csp[MAXCSBUFS];/* list of fs_cs info buffers */ - short fs_cpc; /* cyl per cycle in postbl */ + long fs_cpc; /* cyl per cycle in postbl */ short fs_postbl[MAXCPG][NRPOS];/* head of blocks for each rotation */ + long fs_magic; /* magic number */ u_char fs_rotbl[1]; /* list of blocks for each rotation */ /* actually longer */ }; @@ -238,9 +243,10 @@ struct fs /* * Cylinder group block for a file system. */ -#define CG_MAGIC 0x092752 +#define CG_MAGIC 0x090255 struct cg { - long cg_magic; /* magic number */ + struct cg *cg_link; /* linked list of cyl groups */ + struct cg *cg_rlink; /* used for incore cyl groups */ time_t cg_time; /* time last written */ long cg_cgx; /* we are the cgx'th cylinder group */ short cg_ncyl; /* number of cyl's this cg */ @@ -254,6 +260,7 @@ struct cg { long cg_btot[MAXCPG]; /* block totals per cylinder */ short cg_b[MAXCPG][NRPOS]; /* positions of free blocks */ char cg_iused[MAXIPG/NBBY]; /* used inode map */ + long cg_magic; /* magic number */ char cg_free[1]; /* free block map */ /* actually longer */ }; @@ -276,22 +283,15 @@ struct cg { /* * Cylinder group macros to locate things in cylinder groups. - * - * Cylinder group to disk block address of spare boot block - * and super block. - * Note that these are in absolute addresses, and can NOT - * in general be expressable in terms of file system addresses. - */ -#define cgbblock(fs, c) (fsbtodb(fs, cgbase(fs, c)) + (fs)->fs_bblkno) -#define cgsblock(fs, c) (fsbtodb(fs, cgbase(fs, c)) + (fs)->fs_sblkno) - -/* - * File system addresses of cylinder group data structures. + * They calc file system addresses of cylinder group data structures. */ -#define cgbase(fs, c) ((daddr_t)((fs)->fs_fpg * (c))) /* base addr */ -#define cgtod(fs, c) (cgbase(fs, c) + (fs)->fs_cblkno) /* cg block */ -#define cgimin(fs, c) (cgbase(fs, c) + (fs)->fs_iblkno) /* inode blk */ -#define cgdmin(fs, c) (cgbase(fs, c) + (fs)->fs_dblkno) /* 1st data */ +#define cgbase(fs, c) ((daddr_t)((fs)->fs_fpg * (c))) +#define cgstart(fs, c) \ + (cgbase(fs, c) + (fs)->fs_cgoffset * ((c) & ~((fs)->fs_cgmask))) +#define cgsblock(fs, c) (cgstart(fs, c) + (fs)->fs_sblkno) /* super blk */ +#define cgtod(fs, c) (cgstart(fs, c) + (fs)->fs_cblkno) /* cg block */ +#define cgimin(fs, c) (cgstart(fs, c) + (fs)->fs_iblkno) /* inode blk */ +#define cgdmin(fs, c) (cgstart(fs, c) + (fs)->fs_dblkno) /* 1st data */ /* * Macros for handling inode numbers: