17c478bd9Sstevel@tonic-gate /* 27c478bd9Sstevel@tonic-gate * Mach Operating System 37c478bd9Sstevel@tonic-gate * Copyright (c) 1991,1990 Carnegie Mellon University 47c478bd9Sstevel@tonic-gate * All Rights Reserved. 57c478bd9Sstevel@tonic-gate * 67c478bd9Sstevel@tonic-gate * Permission to use, copy, modify and distribute this software and its 77c478bd9Sstevel@tonic-gate * documentation is hereby granted, provided that both the copyright 87c478bd9Sstevel@tonic-gate * notice and this permission notice appear in all copies of the 97c478bd9Sstevel@tonic-gate * software, derivative works or modified versions, and any portions 107c478bd9Sstevel@tonic-gate * thereof, and that both notices appear in supporting documentation. 117c478bd9Sstevel@tonic-gate * 127c478bd9Sstevel@tonic-gate * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 137c478bd9Sstevel@tonic-gate * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 147c478bd9Sstevel@tonic-gate * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 157c478bd9Sstevel@tonic-gate * 167c478bd9Sstevel@tonic-gate * Carnegie Mellon requests users of this software to return to 177c478bd9Sstevel@tonic-gate * 187c478bd9Sstevel@tonic-gate * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 197c478bd9Sstevel@tonic-gate * School of Computer Science 207c478bd9Sstevel@tonic-gate * Carnegie Mellon University 217c478bd9Sstevel@tonic-gate * Pittsburgh PA 15213-3890 227c478bd9Sstevel@tonic-gate * 237c478bd9Sstevel@tonic-gate * any improvements or extensions that they make and grant Carnegie Mellon 247c478bd9Sstevel@tonic-gate * the rights to redistribute these changes. 257c478bd9Sstevel@tonic-gate */ 267c478bd9Sstevel@tonic-gate /* 277c478bd9Sstevel@tonic-gate * Copyright (c) 1982, 1986 Regents of the University of California. 287c478bd9Sstevel@tonic-gate * All rights reserved. 297c478bd9Sstevel@tonic-gate * 307c478bd9Sstevel@tonic-gate * Redistribution and use in source and binary forms are permitted 317c478bd9Sstevel@tonic-gate * provided that the above copyright notice and this paragraph are 327c478bd9Sstevel@tonic-gate * duplicated in all such forms and that any documentation, 337c478bd9Sstevel@tonic-gate * advertising materials, and other materials related to such 347c478bd9Sstevel@tonic-gate * distribution and use acknowledge that the software was developed 357c478bd9Sstevel@tonic-gate * by the University of California, Berkeley. The name of the 367c478bd9Sstevel@tonic-gate * University may not be used to endorse or promote products derived 377c478bd9Sstevel@tonic-gate * from this software without specific prior written permission. 387c478bd9Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 397c478bd9Sstevel@tonic-gate * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 407c478bd9Sstevel@tonic-gate * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 417c478bd9Sstevel@tonic-gate * 427c478bd9Sstevel@tonic-gate * @(#)fs.h 7.7 (Berkeley) 5/9/89 437c478bd9Sstevel@tonic-gate */ 447c478bd9Sstevel@tonic-gate 457c478bd9Sstevel@tonic-gate /* 467c478bd9Sstevel@tonic-gate * Each disk drive contains some number of file systems. 477c478bd9Sstevel@tonic-gate * A file system consists of a number of cylinder groups. 487c478bd9Sstevel@tonic-gate * Each cylinder group has inodes and data. 497c478bd9Sstevel@tonic-gate * 507c478bd9Sstevel@tonic-gate * A file system is described by its super-block, which in turn 517c478bd9Sstevel@tonic-gate * describes the cylinder groups. The super-block is critical 527c478bd9Sstevel@tonic-gate * data and is replicated in each cylinder group to protect against 537c478bd9Sstevel@tonic-gate * catastrophic loss. This is done at `newfs' time and the critical 547c478bd9Sstevel@tonic-gate * super-block data does not change, so the copies need not be 557c478bd9Sstevel@tonic-gate * referenced further unless disaster strikes. 567c478bd9Sstevel@tonic-gate * 577c478bd9Sstevel@tonic-gate * For file system fs, the offsets of the various blocks of interest 587c478bd9Sstevel@tonic-gate * are given in the super block as: 597c478bd9Sstevel@tonic-gate * [fs->fs_sblkno] Super-block 607c478bd9Sstevel@tonic-gate * [fs->fs_cblkno] Cylinder group block 617c478bd9Sstevel@tonic-gate * [fs->fs_iblkno] Inode blocks 627c478bd9Sstevel@tonic-gate * [fs->fs_dblkno] Data blocks 637c478bd9Sstevel@tonic-gate * The beginning of cylinder group cg in fs, is given by 647c478bd9Sstevel@tonic-gate * the ``cgbase(fs, cg)'' macro. 657c478bd9Sstevel@tonic-gate * 667c478bd9Sstevel@tonic-gate * The first boot and super blocks are given in absolute disk addresses. 677c478bd9Sstevel@tonic-gate * The byte-offset forms are preferred, as they don't imply a sector size. 687c478bd9Sstevel@tonic-gate */ 697c478bd9Sstevel@tonic-gate #define BBSIZE 8192 707c478bd9Sstevel@tonic-gate #define SBSIZE 8192 717c478bd9Sstevel@tonic-gate #define BBOFF ((mach_off_t)(0)) 727c478bd9Sstevel@tonic-gate #define SBOFF ((mach_off_t)(BBOFF + BBSIZE)) 737c478bd9Sstevel@tonic-gate #define BBLOCK ((mach_daddr_t)(0)) 747c478bd9Sstevel@tonic-gate #define SBLOCK ((mach_daddr_t)(BBLOCK + BBSIZE / DEV_BSIZE)) 757c478bd9Sstevel@tonic-gate 767c478bd9Sstevel@tonic-gate /* 777c478bd9Sstevel@tonic-gate * Addresses stored in inodes are capable of addressing fragments 787c478bd9Sstevel@tonic-gate * of `blocks'. File system blocks of at most size MAXBSIZE can 797c478bd9Sstevel@tonic-gate * be optionally broken into 2, 4, or 8 pieces, each of which is 807c478bd9Sstevel@tonic-gate * addressible; these pieces may be DEV_BSIZE, or some multiple of 817c478bd9Sstevel@tonic-gate * a DEV_BSIZE unit. 827c478bd9Sstevel@tonic-gate * 837c478bd9Sstevel@tonic-gate * Large files consist of exclusively large data blocks. To avoid 847c478bd9Sstevel@tonic-gate * undue wasted disk space, the last data block of a small file may be 857c478bd9Sstevel@tonic-gate * allocated as only as many fragments of a large block as are 867c478bd9Sstevel@tonic-gate * necessary. The file system format retains only a single pointer 877c478bd9Sstevel@tonic-gate * to such a fragment, which is a piece of a single large block that 887c478bd9Sstevel@tonic-gate * has been divided. The size of such a fragment is determinable from 897c478bd9Sstevel@tonic-gate * information in the inode, using the ``blksize(fs, ip, lbn)'' macro. 907c478bd9Sstevel@tonic-gate * 917c478bd9Sstevel@tonic-gate * The file system records space availability at the fragment level; 927c478bd9Sstevel@tonic-gate * to determine block availability, aligned fragments are examined. 937c478bd9Sstevel@tonic-gate * 947c478bd9Sstevel@tonic-gate * The root inode is the root of the file system. 957c478bd9Sstevel@tonic-gate * Inode 0 can't be used for normal purposes and 967c478bd9Sstevel@tonic-gate * historically bad blocks were linked to inode 1, 977c478bd9Sstevel@tonic-gate * thus the root inode is 2. (inode 1 is no longer used for 987c478bd9Sstevel@tonic-gate * this purpose, however numerous dump tapes make this 997c478bd9Sstevel@tonic-gate * assumption, so we are stuck with it) 1007c478bd9Sstevel@tonic-gate */ 1017c478bd9Sstevel@tonic-gate #define ROOTINO ((mach_ino_t)2) /* i number of all roots */ 1027c478bd9Sstevel@tonic-gate 1037c478bd9Sstevel@tonic-gate /* 1047c478bd9Sstevel@tonic-gate * MINBSIZE is the smallest allowable block size. 1057c478bd9Sstevel@tonic-gate * In order to insure that it is possible to create files of size 1067c478bd9Sstevel@tonic-gate * 2^32 with only two levels of indirection, MINBSIZE is set to 4096. 1077c478bd9Sstevel@tonic-gate * MINBSIZE must be big enough to hold a cylinder group block, 1087c478bd9Sstevel@tonic-gate * thus changes to (struct cg) must keep its size within MINBSIZE. 1097c478bd9Sstevel@tonic-gate * Note that super blocks are always of size SBSIZE, 1107c478bd9Sstevel@tonic-gate * and that both SBSIZE and MAXBSIZE must be >= MINBSIZE. 1117c478bd9Sstevel@tonic-gate */ 1127c478bd9Sstevel@tonic-gate #define MINBSIZE 4096 1137c478bd9Sstevel@tonic-gate 1147c478bd9Sstevel@tonic-gate /* 1157c478bd9Sstevel@tonic-gate * The path name on which the file system is mounted is maintained 1167c478bd9Sstevel@tonic-gate * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in 1177c478bd9Sstevel@tonic-gate * the super block for this name. 1187c478bd9Sstevel@tonic-gate * The limit on the amount of summary information per file system 1197c478bd9Sstevel@tonic-gate * is defined by MAXCSBUFS. It is currently parameterized for a 1207c478bd9Sstevel@tonic-gate * maximum of two million cylinders. 1217c478bd9Sstevel@tonic-gate */ 1227c478bd9Sstevel@tonic-gate #define MAXMNTLEN 512 1237c478bd9Sstevel@tonic-gate #define MAXCSBUFS 32 1247c478bd9Sstevel@tonic-gate 1257c478bd9Sstevel@tonic-gate /* 1267c478bd9Sstevel@tonic-gate * Per cylinder group information; summarized in blocks allocated 1277c478bd9Sstevel@tonic-gate * from first cylinder group data blocks. These blocks have to be 1287c478bd9Sstevel@tonic-gate * read in from fs_csaddr (size fs_cssize) in addition to the 1297c478bd9Sstevel@tonic-gate * super block. 1307c478bd9Sstevel@tonic-gate * 1317c478bd9Sstevel@tonic-gate * N.B. sizeof(struct csum) must be a power of two in order for 1327c478bd9Sstevel@tonic-gate * the ``fs_cs'' macro to work (see below). 1337c478bd9Sstevel@tonic-gate */ 1347c478bd9Sstevel@tonic-gate struct csum 1357c478bd9Sstevel@tonic-gate { 1367c478bd9Sstevel@tonic-gate int cs_ndir; /* number of directories */ 1377c478bd9Sstevel@tonic-gate int cs_nbfree; /* number of free blocks */ 1387c478bd9Sstevel@tonic-gate int cs_nifree; /* number of free inodes */ 1397c478bd9Sstevel@tonic-gate int cs_nffree; /* number of free frags */ 1407c478bd9Sstevel@tonic-gate }; 1417c478bd9Sstevel@tonic-gate 1427c478bd9Sstevel@tonic-gate /* 1437c478bd9Sstevel@tonic-gate * Super block for a file system. 1447c478bd9Sstevel@tonic-gate */ 1457c478bd9Sstevel@tonic-gate #define FS_MAGIC 0x011954 1467c478bd9Sstevel@tonic-gate struct fs 1477c478bd9Sstevel@tonic-gate { 1487c478bd9Sstevel@tonic-gate int xxx1; /* struct fs *fs_link; */ 1497c478bd9Sstevel@tonic-gate int xxx2; /* struct fs *fs_rlink; */ 1507c478bd9Sstevel@tonic-gate mach_daddr_t fs_sblkno; /* addr of super-block in filesys */ 1517c478bd9Sstevel@tonic-gate mach_daddr_t fs_cblkno; /* offset of cyl-block in filesys */ 1527c478bd9Sstevel@tonic-gate mach_daddr_t fs_iblkno; /* offset of inode-blocks in filesys */ 1537c478bd9Sstevel@tonic-gate mach_daddr_t fs_dblkno; /* offset of first data after cg */ 1547c478bd9Sstevel@tonic-gate int fs_cgoffset; /* cylinder group offset in cylinder */ 1557c478bd9Sstevel@tonic-gate int fs_cgmask; /* used to calc mod fs_ntrak */ 1567c478bd9Sstevel@tonic-gate mach_time_t fs_time; /* last time written */ 1577c478bd9Sstevel@tonic-gate int fs_size; /* number of blocks in fs */ 1587c478bd9Sstevel@tonic-gate int fs_dsize; /* number of data blocks in fs */ 1597c478bd9Sstevel@tonic-gate int fs_ncg; /* number of cylinder groups */ 1607c478bd9Sstevel@tonic-gate int fs_bsize; /* size of basic blocks in fs */ 1617c478bd9Sstevel@tonic-gate int fs_fsize; /* size of frag blocks in fs */ 1627c478bd9Sstevel@tonic-gate int fs_frag; /* number of frags in a block in fs */ 1637c478bd9Sstevel@tonic-gate /* these are configuration parameters */ 1647c478bd9Sstevel@tonic-gate int fs_minfree; /* minimum percentage of free blocks */ 1657c478bd9Sstevel@tonic-gate int fs_rotdelay; /* num of ms for optimal next block */ 1667c478bd9Sstevel@tonic-gate int fs_rps; /* disk revolutions per second */ 1677c478bd9Sstevel@tonic-gate /* these fields can be computed from the others */ 1687c478bd9Sstevel@tonic-gate int fs_bmask; /* ``blkoff'' calc of blk offsets */ 1697c478bd9Sstevel@tonic-gate int fs_fmask; /* ``fragoff'' calc of frag offsets */ 1707c478bd9Sstevel@tonic-gate int fs_bshift; /* ``lblkno'' calc of logical blkno */ 1717c478bd9Sstevel@tonic-gate int fs_fshift; /* ``numfrags'' calc number of frags */ 1727c478bd9Sstevel@tonic-gate /* these are configuration parameters */ 1737c478bd9Sstevel@tonic-gate int fs_maxcontig; /* max number of contiguous blks */ 1747c478bd9Sstevel@tonic-gate int fs_maxbpg; /* max number of blks per cyl group */ 1757c478bd9Sstevel@tonic-gate /* these fields can be computed from the others */ 1767c478bd9Sstevel@tonic-gate int fs_fragshift; /* block to frag shift */ 1777c478bd9Sstevel@tonic-gate int fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */ 1787c478bd9Sstevel@tonic-gate int fs_sbsize; /* actual size of super block */ 1797c478bd9Sstevel@tonic-gate int fs_csmask; /* csum block offset */ 1807c478bd9Sstevel@tonic-gate int fs_csshift; /* csum block number */ 1817c478bd9Sstevel@tonic-gate int fs_nindir; /* value of NINDIR */ 1827c478bd9Sstevel@tonic-gate int fs_inopb; /* value of INOPB */ 1837c478bd9Sstevel@tonic-gate int fs_nspf; /* value of NSPF */ 1847c478bd9Sstevel@tonic-gate /* yet another configuration parameter */ 1857c478bd9Sstevel@tonic-gate int fs_optim; /* optimization preference, see below */ 1867c478bd9Sstevel@tonic-gate /* these fields are derived from the hardware */ 1877c478bd9Sstevel@tonic-gate int fs_npsect; /* # sectors/track including spares */ 1887c478bd9Sstevel@tonic-gate int fs_interleave; /* hardware sector interleave */ 1897c478bd9Sstevel@tonic-gate int fs_trackskew; /* sector 0 skew, per track */ 1907c478bd9Sstevel@tonic-gate int fs_headswitch; /* head switch time, usec */ 1917c478bd9Sstevel@tonic-gate int fs_trkseek; /* track-to-track seek, usec */ 1927c478bd9Sstevel@tonic-gate /* sizes determined by number of cylinder groups and their sizes */ 1937c478bd9Sstevel@tonic-gate mach_daddr_t fs_csaddr; /* blk addr of cyl grp summary area */ 1947c478bd9Sstevel@tonic-gate int fs_cssize; /* size of cyl grp summary area */ 1957c478bd9Sstevel@tonic-gate int fs_cgsize; /* cylinder group size */ 1967c478bd9Sstevel@tonic-gate /* these fields are derived from the hardware */ 1977c478bd9Sstevel@tonic-gate int fs_ntrak; /* tracks per cylinder */ 1987c478bd9Sstevel@tonic-gate int fs_nsect; /* sectors per track */ 1997c478bd9Sstevel@tonic-gate int fs_spc; /* sectors per cylinder */ 2007c478bd9Sstevel@tonic-gate /* this comes from the disk driver partitioning */ 2017c478bd9Sstevel@tonic-gate int fs_ncyl; /* cylinders in file system */ 2027c478bd9Sstevel@tonic-gate /* these fields can be computed from the others */ 2037c478bd9Sstevel@tonic-gate int fs_cpg; /* cylinders per group */ 2047c478bd9Sstevel@tonic-gate int fs_ipg; /* inodes per group */ 2057c478bd9Sstevel@tonic-gate int fs_fpg; /* blocks per group * fs_frag */ 2067c478bd9Sstevel@tonic-gate /* this data must be re-computed after crashes */ 2077c478bd9Sstevel@tonic-gate struct csum fs_cstotal; /* cylinder summary information */ 2087c478bd9Sstevel@tonic-gate /* these fields are cleared at mount time */ 2097c478bd9Sstevel@tonic-gate char fs_fmod; /* super block modified flag */ 2107c478bd9Sstevel@tonic-gate char fs_clean; /* file system is clean flag */ 2117c478bd9Sstevel@tonic-gate char fs_ronly; /* mounted read-only flag */ 2127c478bd9Sstevel@tonic-gate char fs_flags; /* currently unused flag */ 2137c478bd9Sstevel@tonic-gate char fs_fsmnt[MAXMNTLEN]; /* name mounted on */ 2147c478bd9Sstevel@tonic-gate /* these fields retain the current block allocation info */ 2157c478bd9Sstevel@tonic-gate int fs_cgrotor; /* last cg searched */ 2167c478bd9Sstevel@tonic-gate #if 1 2177c478bd9Sstevel@tonic-gate int was_fs_csp[MAXCSBUFS]; 2187c478bd9Sstevel@tonic-gate #else 2197c478bd9Sstevel@tonic-gate struct csum *fs_csp[MAXCSBUFS]; /* list of fs_cs info buffers */ 2207c478bd9Sstevel@tonic-gate #endif 2217c478bd9Sstevel@tonic-gate int fs_cpc; /* cyl per cycle in postbl */ 2227c478bd9Sstevel@tonic-gate short fs_opostbl[16][8]; /* old rotation block list head */ 2237c478bd9Sstevel@tonic-gate long fs_sparecon[50]; /* reserved for future constants */ 2247c478bd9Sstevel@tonic-gate long fs_contigsumsize; /* size of cluster summary array */ 2257c478bd9Sstevel@tonic-gate long fs_maxsymlinklen; /* max length of an internal symlink */ 2267c478bd9Sstevel@tonic-gate long fs_inodefmt; /* format of on-disk inodes */ 2277c478bd9Sstevel@tonic-gate quad fs_maxfilesize; /* maximum representable file size */ 2287c478bd9Sstevel@tonic-gate quad fs_qbmask; /* ~fs_bmask - for use with quad size */ 2297c478bd9Sstevel@tonic-gate quad fs_qfmask; /* ~fs_fmask - for use with quad size */ 2307c478bd9Sstevel@tonic-gate long fs_state; /* validate fs_clean field */ 2317c478bd9Sstevel@tonic-gate int fs_postblformat; /* format of positional layout tables */ 2327c478bd9Sstevel@tonic-gate int fs_nrpos; /* number of rotaional positions */ 2337c478bd9Sstevel@tonic-gate int fs_postbloff; /* (short) rotation block list head */ 2347c478bd9Sstevel@tonic-gate int fs_rotbloff; /* (u_char) blocks for each rotation */ 2357c478bd9Sstevel@tonic-gate int fs_magic; /* magic number */ 2367c478bd9Sstevel@tonic-gate u_char fs_space[1]; /* list of blocks for each rotation */ 2377c478bd9Sstevel@tonic-gate /* actually longer */ 2387c478bd9Sstevel@tonic-gate }; 2397c478bd9Sstevel@tonic-gate /* 2407c478bd9Sstevel@tonic-gate * Preference for optimization. 2417c478bd9Sstevel@tonic-gate */ 2427c478bd9Sstevel@tonic-gate #define FS_OPTTIME 0 /* minimize allocation time */ 2437c478bd9Sstevel@tonic-gate #define FS_OPTSPACE 1 /* minimize disk fragmentation */ 2447c478bd9Sstevel@tonic-gate 2457c478bd9Sstevel@tonic-gate /* 2467c478bd9Sstevel@tonic-gate * Rotational layout table format types 2477c478bd9Sstevel@tonic-gate */ 2487c478bd9Sstevel@tonic-gate #define FS_42POSTBLFMT -1 /* 4.2BSD rotational table format */ 2497c478bd9Sstevel@tonic-gate #define FS_DYNAMICPOSTBLFMT 1 /* dynamic rotational table format */ 2507c478bd9Sstevel@tonic-gate /* 2517c478bd9Sstevel@tonic-gate * Macros for access to superblock array structures 2527c478bd9Sstevel@tonic-gate */ 2537c478bd9Sstevel@tonic-gate #define fs_postbl(fs, cylno) \ 2547c478bd9Sstevel@tonic-gate (((fs)->fs_postblformat == FS_42POSTBLFMT) \ 2557c478bd9Sstevel@tonic-gate ? ((fs)->fs_opostbl[cylno]) \ 2567c478bd9Sstevel@tonic-gate : ((short *)((char *)(fs) + (fs)->fs_postbloff) + (cylno) * (fs)->fs_nrpos)) 2577c478bd9Sstevel@tonic-gate #define fs_rotbl(fs) \ 2587c478bd9Sstevel@tonic-gate (((fs)->fs_postblformat == FS_42POSTBLFMT) \ 2597c478bd9Sstevel@tonic-gate ? ((fs)->fs_space) \ 2607c478bd9Sstevel@tonic-gate : ((u_char *)((char *)(fs) + (fs)->fs_rotbloff))) 2617c478bd9Sstevel@tonic-gate 2627c478bd9Sstevel@tonic-gate /* 2637c478bd9Sstevel@tonic-gate * Convert cylinder group to base address of its global summary info. 2647c478bd9Sstevel@tonic-gate * 2657c478bd9Sstevel@tonic-gate * N.B. This macro assumes that sizeof(struct csum) is a power of two. 2667c478bd9Sstevel@tonic-gate */ 2677c478bd9Sstevel@tonic-gate #define fs_cs(fs, indx) \ 2687c478bd9Sstevel@tonic-gate fs_csp[(indx) >> (fs)->fs_csshift][(indx) & ~(fs)->fs_csmask] 2697c478bd9Sstevel@tonic-gate 2707c478bd9Sstevel@tonic-gate /* 2717c478bd9Sstevel@tonic-gate * Cylinder group block for a file system. 2727c478bd9Sstevel@tonic-gate */ 2737c478bd9Sstevel@tonic-gate #define CG_MAGIC 0x090255 2747c478bd9Sstevel@tonic-gate struct cg 2757c478bd9Sstevel@tonic-gate { 2767c478bd9Sstevel@tonic-gate int xxx1; /* struct cg *cg_link; */ 2777c478bd9Sstevel@tonic-gate int cg_magic; /* magic number */ 2787c478bd9Sstevel@tonic-gate mach_time_t cg_time; /* time last written */ 2797c478bd9Sstevel@tonic-gate int cg_cgx; /* we are the cgx'th cylinder group */ 2807c478bd9Sstevel@tonic-gate short cg_ncyl; /* number of cyl's this cg */ 2817c478bd9Sstevel@tonic-gate short cg_niblk; /* number of inode blocks this cg */ 2827c478bd9Sstevel@tonic-gate int cg_ndblk; /* number of data blocks this cg */ 2837c478bd9Sstevel@tonic-gate struct csum cg_cs; /* cylinder summary information */ 2847c478bd9Sstevel@tonic-gate int cg_rotor; /* position of last used block */ 2857c478bd9Sstevel@tonic-gate int cg_frotor; /* position of last used frag */ 2867c478bd9Sstevel@tonic-gate int cg_irotor; /* position of last used inode */ 2877c478bd9Sstevel@tonic-gate int cg_frsum[MAXFRAG]; /* counts of available frags */ 2887c478bd9Sstevel@tonic-gate int cg_btotoff; /* (long) block totals per cylinder */ 2897c478bd9Sstevel@tonic-gate int cg_boff; /* (short) free block positions */ 2907c478bd9Sstevel@tonic-gate int cg_iusedoff; /* (char) used inode map */ 2917c478bd9Sstevel@tonic-gate int cg_freeoff; /* (u_char) free block map */ 2927c478bd9Sstevel@tonic-gate int cg_nextfreeoff; /* (u_char) next available space */ 2937c478bd9Sstevel@tonic-gate int cg_sparecon[16]; /* reserved for future use */ 2947c478bd9Sstevel@tonic-gate u_char cg_space[1]; /* space for cylinder group maps */ 2957c478bd9Sstevel@tonic-gate /* actually longer */ 2967c478bd9Sstevel@tonic-gate }; 2977c478bd9Sstevel@tonic-gate /* 2987c478bd9Sstevel@tonic-gate * Macros for access to cylinder group array structures 2997c478bd9Sstevel@tonic-gate */ 3007c478bd9Sstevel@tonic-gate #define cg_blktot(cgp) \ 3017c478bd9Sstevel@tonic-gate (((cgp)->cg_magic != CG_MAGIC) \ 3027c478bd9Sstevel@tonic-gate ? (((struct ocg *)(cgp))->cg_btot) \ 3037c478bd9Sstevel@tonic-gate : ((int *)((char *)(cgp) + (cgp)->cg_btotoff))) 3047c478bd9Sstevel@tonic-gate #define cg_blks(fs, cgp, cylno) \ 3057c478bd9Sstevel@tonic-gate (((cgp)->cg_magic != CG_MAGIC) \ 3067c478bd9Sstevel@tonic-gate ? (((struct ocg *)(cgp))->cg_b[cylno]) \ 3077c478bd9Sstevel@tonic-gate : ((short *)((char *)(cgp) + (cgp)->cg_boff) + (cylno) * (fs)->fs_nrpos)) 3087c478bd9Sstevel@tonic-gate #define cg_inosused(cgp) \ 3097c478bd9Sstevel@tonic-gate (((cgp)->cg_magic != CG_MAGIC) \ 3107c478bd9Sstevel@tonic-gate ? (((struct ocg *)(cgp))->cg_iused) \ 3117c478bd9Sstevel@tonic-gate : ((char *)((char *)(cgp) + (cgp)->cg_iusedoff))) 3127c478bd9Sstevel@tonic-gate #define cg_blksfree(cgp) \ 3137c478bd9Sstevel@tonic-gate (((cgp)->cg_magic != CG_MAGIC) \ 3147c478bd9Sstevel@tonic-gate ? (((struct ocg *)(cgp))->cg_free) \ 3157c478bd9Sstevel@tonic-gate : ((u_char *)((char *)(cgp) + (cgp)->cg_freeoff))) 3167c478bd9Sstevel@tonic-gate #define cg_chkmagic(cgp) \ 3177c478bd9Sstevel@tonic-gate ((cgp)->cg_magic == CG_MAGIC || ((struct ocg *)(cgp))->cg_magic == CG_MAGIC) 3187c478bd9Sstevel@tonic-gate 3197c478bd9Sstevel@tonic-gate /* 3207c478bd9Sstevel@tonic-gate * The following structure is defined 3217c478bd9Sstevel@tonic-gate * for compatibility with old file systems. 3227c478bd9Sstevel@tonic-gate */ 3237c478bd9Sstevel@tonic-gate struct ocg 3247c478bd9Sstevel@tonic-gate { 3257c478bd9Sstevel@tonic-gate int xxx1; /* struct ocg *cg_link; */ 3267c478bd9Sstevel@tonic-gate int xxx2; /* struct ocg *cg_rlink; */ 3277c478bd9Sstevel@tonic-gate mach_time_t cg_time; /* time last written */ 3287c478bd9Sstevel@tonic-gate int cg_cgx; /* we are the cgx'th cylinder group */ 3297c478bd9Sstevel@tonic-gate short cg_ncyl; /* number of cyl's this cg */ 3307c478bd9Sstevel@tonic-gate short cg_niblk; /* number of inode blocks this cg */ 3317c478bd9Sstevel@tonic-gate int cg_ndblk; /* number of data blocks this cg */ 3327c478bd9Sstevel@tonic-gate struct csum cg_cs; /* cylinder summary information */ 3337c478bd9Sstevel@tonic-gate int cg_rotor; /* position of last used block */ 3347c478bd9Sstevel@tonic-gate int cg_frotor; /* position of last used frag */ 3357c478bd9Sstevel@tonic-gate int cg_irotor; /* position of last used inode */ 3367c478bd9Sstevel@tonic-gate int cg_frsum[8]; /* counts of available frags */ 3377c478bd9Sstevel@tonic-gate int cg_btot[32]; /* block totals per cylinder */ 3387c478bd9Sstevel@tonic-gate short cg_b[32][8]; /* positions of free blocks */ 3397c478bd9Sstevel@tonic-gate char cg_iused[256]; /* used inode map */ 3407c478bd9Sstevel@tonic-gate int cg_magic; /* magic number */ 3417c478bd9Sstevel@tonic-gate u_char cg_free[1]; /* free block map */ 3427c478bd9Sstevel@tonic-gate /* actually longer */ 3437c478bd9Sstevel@tonic-gate }; 3447c478bd9Sstevel@tonic-gate 3457c478bd9Sstevel@tonic-gate /* 3467c478bd9Sstevel@tonic-gate * Turn file system block numbers into disk block addresses. 3477c478bd9Sstevel@tonic-gate * This maps file system blocks to device size blocks. 3487c478bd9Sstevel@tonic-gate */ 3497c478bd9Sstevel@tonic-gate #define fsbtodb(fs, b) ((b) << (fs)->fs_fsbtodb) 3507c478bd9Sstevel@tonic-gate #define dbtofsb(fs, b) ((b) >> (fs)->fs_fsbtodb) 3517c478bd9Sstevel@tonic-gate 3527c478bd9Sstevel@tonic-gate /* 3537c478bd9Sstevel@tonic-gate * Cylinder group macros to locate things in cylinder groups. 3547c478bd9Sstevel@tonic-gate * They calc file system addresses of cylinder group data structures. 3557c478bd9Sstevel@tonic-gate */ 3567c478bd9Sstevel@tonic-gate #define cgbase(fs, c) ((mach_daddr_t)((fs)->fs_fpg * (c))) 3577c478bd9Sstevel@tonic-gate #define cgstart(fs, c) \ 3587c478bd9Sstevel@tonic-gate (cgbase(fs, c) + (fs)->fs_cgoffset * ((c) & ~((fs)->fs_cgmask))) 3597c478bd9Sstevel@tonic-gate #define cgsblock(fs, c) (cgstart(fs, c) + (fs)->fs_sblkno) /* super blk */ 3607c478bd9Sstevel@tonic-gate #define cgtod(fs, c) (cgstart(fs, c) + (fs)->fs_cblkno) /* cg block */ 3617c478bd9Sstevel@tonic-gate #define cgimin(fs, c) (cgstart(fs, c) + (fs)->fs_iblkno) /* inode blk */ 3627c478bd9Sstevel@tonic-gate #define cgdmin(fs, c) (cgstart(fs, c) + (fs)->fs_dblkno) /* 1st data */ 3637c478bd9Sstevel@tonic-gate 3647c478bd9Sstevel@tonic-gate /* 3657c478bd9Sstevel@tonic-gate * Macros for handling inode numbers: 3667c478bd9Sstevel@tonic-gate * inode number to file system block offset. 3677c478bd9Sstevel@tonic-gate * inode number to cylinder group number. 3687c478bd9Sstevel@tonic-gate * inode number to file system block address. 3697c478bd9Sstevel@tonic-gate */ 3707c478bd9Sstevel@tonic-gate #define itoo(fs, x) ((x) % INOPB(fs)) 3717c478bd9Sstevel@tonic-gate #define itog(fs, x) ((x) / (fs)->fs_ipg) 3727c478bd9Sstevel@tonic-gate #define itod(fs, x) \ 3737c478bd9Sstevel@tonic-gate ((mach_daddr_t)(cgimin(fs, itog(fs, x)) + \ 3747c478bd9Sstevel@tonic-gate (blkstofrags((fs), (((x) % (fs)->fs_ipg) / INOPB(fs)))))) 3757c478bd9Sstevel@tonic-gate 3767c478bd9Sstevel@tonic-gate /* 3777c478bd9Sstevel@tonic-gate * Give cylinder group number for a file system block. 3787c478bd9Sstevel@tonic-gate * Give cylinder group block number for a file system block. 3797c478bd9Sstevel@tonic-gate */ 3807c478bd9Sstevel@tonic-gate #define dtog(fs, d) ((d) / (fs)->fs_fpg) 3817c478bd9Sstevel@tonic-gate #define dtogd(fs, d) ((d) % (fs)->fs_fpg) 3827c478bd9Sstevel@tonic-gate 3837c478bd9Sstevel@tonic-gate /* 3847c478bd9Sstevel@tonic-gate * Extract the bits for a block from a map. 3857c478bd9Sstevel@tonic-gate * Compute the cylinder and rotational position of a cyl block addr. 3867c478bd9Sstevel@tonic-gate */ 3877c478bd9Sstevel@tonic-gate #define blkmap(fs, map, loc) \ 3887c478bd9Sstevel@tonic-gate (((map)[(loc) / NBBY] >> ((loc) % NBBY)) & (0xff >> (NBBY - (fs)->fs_frag))) 3897c478bd9Sstevel@tonic-gate #define cbtocylno(fs, bno) \ 3907c478bd9Sstevel@tonic-gate ((bno) * NSPF(fs) / (fs)->fs_spc) 3917c478bd9Sstevel@tonic-gate #define cbtorpos(fs, bno) \ 3927c478bd9Sstevel@tonic-gate (((bno) * NSPF(fs) % (fs)->fs_spc / (fs)->fs_nsect * (fs)->fs_trackskew + \ 3937c478bd9Sstevel@tonic-gate (bno) * NSPF(fs) % (fs)->fs_spc % (fs)->fs_nsect * (fs)->fs_interleave) % \ 3947c478bd9Sstevel@tonic-gate (fs)->fs_nsect * (fs)->fs_nrpos / (fs)->fs_npsect) 3957c478bd9Sstevel@tonic-gate 3967c478bd9Sstevel@tonic-gate /* 3977c478bd9Sstevel@tonic-gate * The following macros optimize certain frequently calculated 3987c478bd9Sstevel@tonic-gate * quantities by using shifts and masks in place of divisions 3997c478bd9Sstevel@tonic-gate * modulos and multiplications. 4007c478bd9Sstevel@tonic-gate */ 4017c478bd9Sstevel@tonic-gate #define blkoff(fs, loc) /* calculates (loc % fs->fs_bsize) */ \ 4027c478bd9Sstevel@tonic-gate ((loc) & ~(fs)->fs_bmask) 4037c478bd9Sstevel@tonic-gate #define fragoff(fs, loc) /* calculates (loc % fs->fs_fsize) */ \ 4047c478bd9Sstevel@tonic-gate ((loc) & ~(fs)->fs_fmask) 4057c478bd9Sstevel@tonic-gate #define lblkno(fs, loc) /* calculates (loc / fs->fs_bsize) */ \ 4067c478bd9Sstevel@tonic-gate ((loc) >> (fs)->fs_bshift) 4077c478bd9Sstevel@tonic-gate #define numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \ 4087c478bd9Sstevel@tonic-gate ((loc) >> (fs)->fs_fshift) 4097c478bd9Sstevel@tonic-gate #define blkroundup(fs, size) /* calculates roundup(size, fs->fs_bsize) */ \ 4107c478bd9Sstevel@tonic-gate (((size) + (fs)->fs_bsize - 1) & (fs)->fs_bmask) 4117c478bd9Sstevel@tonic-gate #define fragroundup(fs, size) /* calculates roundup(size, fs->fs_fsize) */ \ 4127c478bd9Sstevel@tonic-gate (((size) + (fs)->fs_fsize - 1) & (fs)->fs_fmask) 4137c478bd9Sstevel@tonic-gate #define fragstoblks(fs, frags) /* calculates (frags / fs->fs_frag) */ \ 4147c478bd9Sstevel@tonic-gate ((frags) >> (fs)->fs_fragshift) 4157c478bd9Sstevel@tonic-gate #define blkstofrags(fs, blks) /* calculates (blks * fs->fs_frag) */ \ 4167c478bd9Sstevel@tonic-gate ((blks) << (fs)->fs_fragshift) 4177c478bd9Sstevel@tonic-gate #define fragnum(fs, fsb) /* calculates (fsb % fs->fs_frag) */ \ 4187c478bd9Sstevel@tonic-gate ((fsb) & ((fs)->fs_frag - 1)) 4197c478bd9Sstevel@tonic-gate #define blknum(fs, fsb) /* calculates rounddown(fsb, fs->fs_frag) */ \ 4207c478bd9Sstevel@tonic-gate ((fsb) &~ ((fs)->fs_frag - 1)) 4217c478bd9Sstevel@tonic-gate 4227c478bd9Sstevel@tonic-gate /* 4237c478bd9Sstevel@tonic-gate * Determine the number of available frags given a 4247c478bd9Sstevel@tonic-gate * percentage to hold in reserve 4257c478bd9Sstevel@tonic-gate */ 4267c478bd9Sstevel@tonic-gate #define freespace(fs, percentreserved) \ 4277c478bd9Sstevel@tonic-gate (blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \ 4287c478bd9Sstevel@tonic-gate (fs)->fs_cstotal.cs_nffree - ((fs)->fs_dsize * (percentreserved) / 100)) 4297c478bd9Sstevel@tonic-gate 4307c478bd9Sstevel@tonic-gate /* 4317c478bd9Sstevel@tonic-gate * Determining the size of a file block in the file system. 4327c478bd9Sstevel@tonic-gate */ 4337c478bd9Sstevel@tonic-gate #define blksize(fs, ip, lbn) \ 4347c478bd9Sstevel@tonic-gate (((lbn) >= NDADDR || (ip)->i_size >= ((lbn) + 1) << (fs)->fs_bshift) \ 4357c478bd9Sstevel@tonic-gate ? (fs)->fs_bsize \ 4367c478bd9Sstevel@tonic-gate : (fragroundup(fs, blkoff(fs, (ip)->i_size)))) 4377c478bd9Sstevel@tonic-gate #define dblksize(fs, dip, lbn) \ 4387c478bd9Sstevel@tonic-gate (((lbn) >= NDADDR || (dip)->di_size >= ((lbn) + 1) << (fs)->fs_bshift) \ 4397c478bd9Sstevel@tonic-gate ? (fs)->fs_bsize \ 4407c478bd9Sstevel@tonic-gate : (fragroundup(fs, blkoff(fs, (dip)->di_size)))) 4417c478bd9Sstevel@tonic-gate 4427c478bd9Sstevel@tonic-gate /* 4437c478bd9Sstevel@tonic-gate * Number of disk sectors per block; assumes DEV_BSIZE byte sector size. 4447c478bd9Sstevel@tonic-gate */ 4457c478bd9Sstevel@tonic-gate #define NSPB(fs) ((fs)->fs_nspf << (fs)->fs_fragshift) 4467c478bd9Sstevel@tonic-gate #define NSPF(fs) ((fs)->fs_nspf) 4477c478bd9Sstevel@tonic-gate 4487c478bd9Sstevel@tonic-gate /* 4497c478bd9Sstevel@tonic-gate * INOPB is the number of inodes in a secondary storage block. 4507c478bd9Sstevel@tonic-gate */ 4517c478bd9Sstevel@tonic-gate #define INOPB(fs) ((fs)->fs_inopb) 4527c478bd9Sstevel@tonic-gate #define INOPF(fs) ((fs)->fs_inopb >> (fs)->fs_fragshift) 4537c478bd9Sstevel@tonic-gate 4547c478bd9Sstevel@tonic-gate /* 4557c478bd9Sstevel@tonic-gate * NINDIR is the number of indirects in a file system block. 4567c478bd9Sstevel@tonic-gate */ 4577c478bd9Sstevel@tonic-gate #define NINDIR(fs) ((fs)->fs_nindir) 458