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2936258f1d
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1300 lines
35 KiB
C
1300 lines
35 KiB
C
/*
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* Copyright (c) 1980, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)mkfs.c 8.3 (Berkeley) 2/3/94";
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#endif /* not lint */
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#include <unistd.h>
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <sys/resource.h>
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#include <ufs/ufs/dinode.h>
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#include <ufs/ufs/dir.h>
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#include <ufs/ffs/fs.h>
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#include <sys/disklabel.h>
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#include <sys/file.h>
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#include <sys/mman.h>
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#include <sys/ioctl.h>
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#ifndef STANDALONE
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#include <a.out.h>
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#include <stdio.h>
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#endif
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/*
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* make file system for cylinder-group style file systems
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*/
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/*
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* We limit the size of the inode map to be no more than a
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* third of the cylinder group space, since we must leave at
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* least an equal amount of space for the block map.
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*
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* N.B.: MAXIPG must be a multiple of INOPB(fs).
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*/
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#define MAXIPG(fs) roundup((fs)->fs_bsize * NBBY / 3, INOPB(fs))
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#define UMASK 0755
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#define MAXINOPB (MAXBSIZE / sizeof(struct dinode))
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#define POWEROF2(num) (((num) & ((num) - 1)) == 0)
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/*
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* variables set up by front end.
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*/
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extern int mfs; /* run as the memory based filesystem */
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extern int Nflag; /* run mkfs without writing file system */
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extern int Oflag; /* format as an 4.3BSD file system */
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extern int fssize; /* file system size */
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extern int ntracks; /* # tracks/cylinder */
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extern int nsectors; /* # sectors/track */
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extern int nphyssectors; /* # sectors/track including spares */
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extern int secpercyl; /* sectors per cylinder */
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extern int sectorsize; /* bytes/sector */
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extern int rpm; /* revolutions/minute of drive */
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extern int interleave; /* hardware sector interleave */
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extern int trackskew; /* sector 0 skew, per track */
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extern int headswitch; /* head switch time, usec */
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extern int trackseek; /* track-to-track seek, usec */
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extern int fsize; /* fragment size */
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extern int bsize; /* block size */
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extern int cpg; /* cylinders/cylinder group */
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extern int cpgflg; /* cylinders/cylinder group flag was given */
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extern int minfree; /* free space threshold */
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extern int opt; /* optimization preference (space or time) */
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extern int density; /* number of bytes per inode */
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extern int maxcontig; /* max contiguous blocks to allocate */
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extern int rotdelay; /* rotational delay between blocks */
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extern int maxbpg; /* maximum blocks per file in a cyl group */
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extern int nrpos; /* # of distinguished rotational positions */
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extern int bbsize; /* boot block size */
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extern int sbsize; /* superblock size */
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extern u_long memleft; /* virtual memory available */
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extern caddr_t membase; /* start address of memory based filesystem */
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extern caddr_t malloc(), calloc();
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extern char * filename;
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union {
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struct fs fs;
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char pad[SBSIZE];
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} fsun;
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#define sblock fsun.fs
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struct csum *fscs;
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union {
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struct cg cg;
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char pad[MAXBSIZE];
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} cgun;
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#define acg cgun.cg
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struct dinode zino[MAXBSIZE / sizeof(struct dinode)];
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int fsi, fso;
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daddr_t alloc();
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static int charsperline();
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mkfs(pp, fsys, fi, fo)
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struct partition *pp;
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char *fsys;
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int fi, fo;
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{
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register long i, mincpc, mincpg, inospercg;
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long cylno, rpos, blk, j, warn = 0;
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long used, mincpgcnt, bpcg;
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long mapcramped, inodecramped;
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long postblsize, rotblsize, totalsbsize;
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int ppid, status, fd;
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time_t utime;
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quad_t sizepb;
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void started();
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int width;
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char tmpbuf[100]; /* XXX this will break in about 2,500 years */
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#ifndef STANDALONE
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time(&utime);
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#endif
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if (mfs) {
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ppid = getpid();
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(void) signal(SIGUSR1, started);
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if (i = fork()) {
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if (i == -1) {
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perror("mfs");
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exit(10);
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}
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if (waitpid(i, &status, 0) != -1 && WIFEXITED(status))
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exit(WEXITSTATUS(status));
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exit(11);
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/* NOTREACHED */
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}
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(void)malloc(0);
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if(filename) {
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unsigned char buf[BUFSIZ];
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unsigned long l,l1;
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fd = open(filename,O_RDWR|O_TRUNC|O_CREAT,0644);
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if(fd < 0) {
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perror(filename);
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exit(12);
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}
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for(l=0;l< fssize * sectorsize;l += l1) {
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l1 = fssize * sectorsize;
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if (BUFSIZ < l1)
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l1 = BUFSIZ;
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if (l1 != write(fd,buf,l1)) {
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perror(filename);
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exit(12);
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}
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}
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membase = mmap(
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0,
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fssize * sectorsize,
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PROT_READ|PROT_WRITE,
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MAP_SHARED,
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fd,
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0);
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if((int)membase == -1) {
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perror("mmap");
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exit(12);
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}
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close(fd);
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} else {
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if (fssize * sectorsize > memleft)
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fssize = (memleft - 16384) / sectorsize;
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if ((membase = malloc(fssize * sectorsize)) == 0)
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exit(12);
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}
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}
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fsi = fi;
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fso = fo;
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if (Oflag) {
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sblock.fs_inodefmt = FS_42INODEFMT;
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sblock.fs_maxsymlinklen = 0;
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} else {
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sblock.fs_inodefmt = FS_44INODEFMT;
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sblock.fs_maxsymlinklen = MAXSYMLINKLEN;
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}
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/*
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* Validate the given file system size.
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* Verify that its last block can actually be accessed.
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*/
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if (fssize <= 0)
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printf("preposterous size %d\n", fssize), exit(13);
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wtfs(fssize - 1, sectorsize, (char *)&sblock);
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/*
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* collect and verify the sector and track info
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*/
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sblock.fs_nsect = nsectors;
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sblock.fs_ntrak = ntracks;
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if (sblock.fs_ntrak <= 0)
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printf("preposterous ntrak %d\n", sblock.fs_ntrak), exit(14);
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if (sblock.fs_nsect <= 0)
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printf("preposterous nsect %d\n", sblock.fs_nsect), exit(15);
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/*
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* collect and verify the block and fragment sizes
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*/
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sblock.fs_bsize = bsize;
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sblock.fs_fsize = fsize;
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if (!POWEROF2(sblock.fs_bsize)) {
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printf("block size must be a power of 2, not %d\n",
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sblock.fs_bsize);
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exit(16);
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}
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if (!POWEROF2(sblock.fs_fsize)) {
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printf("fragment size must be a power of 2, not %d\n",
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sblock.fs_fsize);
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exit(17);
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}
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if (sblock.fs_fsize < sectorsize) {
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printf("fragment size %d is too small, minimum is %d\n",
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sblock.fs_fsize, sectorsize);
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exit(18);
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}
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if (sblock.fs_bsize < MINBSIZE) {
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printf("block size %d is too small, minimum is %d\n",
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sblock.fs_bsize, MINBSIZE);
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exit(19);
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}
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if (sblock.fs_bsize < sblock.fs_fsize) {
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printf("block size (%d) cannot be smaller than fragment size (%d)\n",
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sblock.fs_bsize, sblock.fs_fsize);
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exit(20);
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}
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sblock.fs_bmask = ~(sblock.fs_bsize - 1);
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sblock.fs_fmask = ~(sblock.fs_fsize - 1);
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sblock.fs_qbmask = ~sblock.fs_bmask;
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sblock.fs_qfmask = ~sblock.fs_fmask;
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for (sblock.fs_bshift = 0, i = sblock.fs_bsize; i > 1; i >>= 1)
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sblock.fs_bshift++;
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for (sblock.fs_fshift = 0, i = sblock.fs_fsize; i > 1; i >>= 1)
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sblock.fs_fshift++;
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sblock.fs_frag = numfrags(&sblock, sblock.fs_bsize);
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for (sblock.fs_fragshift = 0, i = sblock.fs_frag; i > 1; i >>= 1)
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sblock.fs_fragshift++;
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if (sblock.fs_frag > MAXFRAG) {
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printf("fragment size %d is too small, minimum with block size %d is %d\n",
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sblock.fs_fsize, sblock.fs_bsize,
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sblock.fs_bsize / MAXFRAG);
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exit(21);
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}
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sblock.fs_nrpos = nrpos;
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sblock.fs_nindir = sblock.fs_bsize / sizeof(daddr_t);
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sblock.fs_inopb = sblock.fs_bsize / sizeof(struct dinode);
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sblock.fs_nspf = sblock.fs_fsize / sectorsize;
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for (sblock.fs_fsbtodb = 0, i = NSPF(&sblock); i > 1; i >>= 1)
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sblock.fs_fsbtodb++;
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sblock.fs_sblkno =
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roundup(howmany(bbsize + sbsize, sblock.fs_fsize), sblock.fs_frag);
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sblock.fs_cblkno = (daddr_t)(sblock.fs_sblkno +
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roundup(howmany(sbsize, sblock.fs_fsize), sblock.fs_frag));
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sblock.fs_iblkno = sblock.fs_cblkno + sblock.fs_frag;
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sblock.fs_cgoffset = roundup(
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howmany(sblock.fs_nsect, NSPF(&sblock)), sblock.fs_frag);
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for (sblock.fs_cgmask = 0xffffffff, i = sblock.fs_ntrak; i > 1; i >>= 1)
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sblock.fs_cgmask <<= 1;
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if (!POWEROF2(sblock.fs_ntrak))
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sblock.fs_cgmask <<= 1;
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sblock.fs_maxfilesize = sblock.fs_bsize * NDADDR - 1;
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for (sizepb = sblock.fs_bsize, i = 0; i < NIADDR; i++) {
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sizepb *= NINDIR(&sblock);
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sblock.fs_maxfilesize += sizepb;
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}
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/* XXX - hack to prevent overflow of a 32bit block number */
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sblock.fs_maxfilesize = MIN(sblock.fs_maxfilesize, (u_quad_t) 1 << 39);
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/*
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* Validate specified/determined secpercyl
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* and calculate minimum cylinders per group.
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*/
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sblock.fs_spc = secpercyl;
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for (sblock.fs_cpc = NSPB(&sblock), i = sblock.fs_spc;
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sblock.fs_cpc > 1 && (i & 1) == 0;
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sblock.fs_cpc >>= 1, i >>= 1)
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/* void */;
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mincpc = sblock.fs_cpc;
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bpcg = sblock.fs_spc * sectorsize;
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inospercg = roundup(bpcg / sizeof(struct dinode), INOPB(&sblock));
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if (inospercg > MAXIPG(&sblock))
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inospercg = MAXIPG(&sblock);
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used = (sblock.fs_iblkno + inospercg / INOPF(&sblock)) * NSPF(&sblock);
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mincpgcnt = howmany(sblock.fs_cgoffset * (~sblock.fs_cgmask) + used,
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sblock.fs_spc);
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mincpg = roundup(mincpgcnt, mincpc);
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/*
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* Ensure that cylinder group with mincpg has enough space
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* for block maps.
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*/
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sblock.fs_cpg = mincpg;
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sblock.fs_ipg = inospercg;
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if (maxcontig > 1)
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sblock.fs_contigsumsize = MIN(maxcontig, FS_MAXCONTIG);
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mapcramped = 0;
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while (CGSIZE(&sblock) > sblock.fs_bsize) {
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mapcramped = 1;
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if (sblock.fs_bsize < MAXBSIZE) {
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sblock.fs_bsize <<= 1;
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if ((i & 1) == 0) {
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i >>= 1;
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} else {
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sblock.fs_cpc <<= 1;
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mincpc <<= 1;
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mincpg = roundup(mincpgcnt, mincpc);
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sblock.fs_cpg = mincpg;
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}
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sblock.fs_frag <<= 1;
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sblock.fs_fragshift += 1;
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if (sblock.fs_frag <= MAXFRAG)
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continue;
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}
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if (sblock.fs_fsize == sblock.fs_bsize) {
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printf("There is no block size that");
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printf(" can support this disk\n");
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exit(22);
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}
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sblock.fs_frag >>= 1;
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sblock.fs_fragshift -= 1;
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sblock.fs_fsize <<= 1;
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sblock.fs_nspf <<= 1;
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}
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/*
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* Ensure that cylinder group with mincpg has enough space for inodes.
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*/
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inodecramped = 0;
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used *= sectorsize;
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inospercg = roundup((mincpg * bpcg - used) / density, INOPB(&sblock));
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sblock.fs_ipg = inospercg;
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while (inospercg > MAXIPG(&sblock)) {
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inodecramped = 1;
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if (mincpc == 1 || sblock.fs_frag == 1 ||
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sblock.fs_bsize == MINBSIZE)
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break;
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printf("With a block size of %d %s %d\n", sblock.fs_bsize,
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"minimum bytes per inode is",
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(mincpg * bpcg - used) / MAXIPG(&sblock) + 1);
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sblock.fs_bsize >>= 1;
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sblock.fs_frag >>= 1;
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sblock.fs_fragshift -= 1;
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mincpc >>= 1;
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sblock.fs_cpg = roundup(mincpgcnt, mincpc);
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if (CGSIZE(&sblock) > sblock.fs_bsize) {
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sblock.fs_bsize <<= 1;
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break;
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}
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mincpg = sblock.fs_cpg;
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inospercg =
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roundup((mincpg * bpcg - used) / density, INOPB(&sblock));
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sblock.fs_ipg = inospercg;
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}
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if (inodecramped) {
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if (inospercg > MAXIPG(&sblock)) {
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printf("Minimum bytes per inode is %d\n",
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(mincpg * bpcg - used) / MAXIPG(&sblock) + 1);
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} else if (!mapcramped) {
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printf("With %d bytes per inode, ", density);
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printf("minimum cylinders per group is %d\n", mincpg);
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}
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}
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if (mapcramped) {
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printf("With %d sectors per cylinder, ", sblock.fs_spc);
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printf("minimum cylinders per group is %d\n", mincpg);
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}
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if (inodecramped || mapcramped) {
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if (sblock.fs_bsize != bsize)
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printf("%s to be changed from %d to %d\n",
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"This requires the block size",
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bsize, sblock.fs_bsize);
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if (sblock.fs_fsize != fsize)
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printf("\t%s to be changed from %d to %d\n",
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"and the fragment size",
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fsize, sblock.fs_fsize);
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exit(23);
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}
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/*
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* Calculate the number of cylinders per group
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*/
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sblock.fs_cpg = cpg;
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if (sblock.fs_cpg % mincpc != 0) {
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printf("%s groups must have a multiple of %d cylinders\n",
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cpgflg ? "Cylinder" : "Warning: cylinder", mincpc);
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sblock.fs_cpg = roundup(sblock.fs_cpg, mincpc);
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if (!cpgflg)
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cpg = sblock.fs_cpg;
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}
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/*
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* Must ensure there is enough space for inodes.
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*/
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sblock.fs_ipg = roundup((sblock.fs_cpg * bpcg - used) / density,
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INOPB(&sblock));
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while (sblock.fs_ipg > MAXIPG(&sblock)) {
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inodecramped = 1;
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sblock.fs_cpg -= mincpc;
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sblock.fs_ipg = roundup((sblock.fs_cpg * bpcg - used) / density,
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INOPB(&sblock));
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}
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/*
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* Must ensure there is enough space to hold block map.
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*/
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while (CGSIZE(&sblock) > sblock.fs_bsize) {
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mapcramped = 1;
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sblock.fs_cpg -= mincpc;
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sblock.fs_ipg = roundup((sblock.fs_cpg * bpcg - used) / density,
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INOPB(&sblock));
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}
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sblock.fs_fpg = (sblock.fs_cpg * sblock.fs_spc) / NSPF(&sblock);
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if ((sblock.fs_cpg * sblock.fs_spc) % NSPB(&sblock) != 0) {
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printf("panic (fs_cpg * fs_spc) % NSPF != 0");
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exit(24);
|
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}
|
|
if (sblock.fs_cpg < mincpg) {
|
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printf("cylinder groups must have at least %d cylinders\n",
|
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mincpg);
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exit(25);
|
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} else if (sblock.fs_cpg != cpg) {
|
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if (!cpgflg)
|
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printf("Warning: ");
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|
else if (!mapcramped && !inodecramped)
|
|
exit(26);
|
|
if (mapcramped && inodecramped)
|
|
printf("Block size and bytes per inode restrict");
|
|
else if (mapcramped)
|
|
printf("Block size restricts");
|
|
else
|
|
printf("Bytes per inode restrict");
|
|
printf(" cylinders per group to %d.\n", sblock.fs_cpg);
|
|
if (cpgflg)
|
|
exit(27);
|
|
}
|
|
sblock.fs_cgsize = fragroundup(&sblock, CGSIZE(&sblock));
|
|
/*
|
|
* Now have size for file system and nsect and ntrak.
|
|
* Determine number of cylinders and blocks in the file system.
|
|
*/
|
|
sblock.fs_size = fssize = dbtofsb(&sblock, fssize);
|
|
sblock.fs_ncyl = fssize * NSPF(&sblock) / sblock.fs_spc;
|
|
if (fssize * NSPF(&sblock) > sblock.fs_ncyl * sblock.fs_spc) {
|
|
sblock.fs_ncyl++;
|
|
warn = 1;
|
|
}
|
|
if (sblock.fs_ncyl < 1) {
|
|
printf("file systems must have at least one cylinder\n");
|
|
exit(28);
|
|
}
|
|
/*
|
|
* Determine feasability/values of rotational layout tables.
|
|
*
|
|
* The size of the rotational layout tables is limited by the
|
|
* size of the superblock, SBSIZE. The amount of space available
|
|
* for tables is calculated as (SBSIZE - sizeof (struct fs)).
|
|
* The size of these tables is inversely proportional to the block
|
|
* size of the file system. The size increases if sectors per track
|
|
* are not powers of two, because more cylinders must be described
|
|
* by the tables before the rotational pattern repeats (fs_cpc).
|
|
*/
|
|
sblock.fs_interleave = interleave;
|
|
sblock.fs_trackskew = trackskew;
|
|
sblock.fs_npsect = nphyssectors;
|
|
sblock.fs_postblformat = FS_DYNAMICPOSTBLFMT;
|
|
sblock.fs_sbsize = fragroundup(&sblock, sizeof(struct fs));
|
|
if (sblock.fs_ntrak == 1) {
|
|
sblock.fs_cpc = 0;
|
|
goto next;
|
|
}
|
|
postblsize = sblock.fs_nrpos * sblock.fs_cpc * sizeof(short);
|
|
rotblsize = sblock.fs_cpc * sblock.fs_spc / NSPB(&sblock);
|
|
totalsbsize = sizeof(struct fs) + rotblsize;
|
|
if (sblock.fs_nrpos == 8 && sblock.fs_cpc <= 16) {
|
|
/* use old static table space */
|
|
sblock.fs_postbloff = (char *)(&sblock.fs_opostbl[0][0]) -
|
|
(char *)(&sblock.fs_link);
|
|
sblock.fs_rotbloff = &sblock.fs_space[0] -
|
|
(u_char *)(&sblock.fs_link);
|
|
} else {
|
|
/* use dynamic table space */
|
|
sblock.fs_postbloff = &sblock.fs_space[0] -
|
|
(u_char *)(&sblock.fs_link);
|
|
sblock.fs_rotbloff = sblock.fs_postbloff + postblsize;
|
|
totalsbsize += postblsize;
|
|
}
|
|
if (totalsbsize > SBSIZE ||
|
|
sblock.fs_nsect > (1 << NBBY) * NSPB(&sblock)) {
|
|
printf("%s %s %d %s %d.%s",
|
|
"Warning: insufficient space in super block for\n",
|
|
"rotational layout tables with nsect", sblock.fs_nsect,
|
|
"and ntrak", sblock.fs_ntrak,
|
|
"\nFile system performance may be impaired.\n");
|
|
sblock.fs_cpc = 0;
|
|
goto next;
|
|
}
|
|
sblock.fs_sbsize = fragroundup(&sblock, totalsbsize);
|
|
/*
|
|
* calculate the available blocks for each rotational position
|
|
*/
|
|
for (cylno = 0; cylno < sblock.fs_cpc; cylno++)
|
|
for (rpos = 0; rpos < sblock.fs_nrpos; rpos++)
|
|
fs_postbl(&sblock, cylno)[rpos] = -1;
|
|
for (i = (rotblsize - 1) * sblock.fs_frag;
|
|
i >= 0; i -= sblock.fs_frag) {
|
|
cylno = cbtocylno(&sblock, i);
|
|
rpos = cbtorpos(&sblock, i);
|
|
blk = fragstoblks(&sblock, i);
|
|
if (fs_postbl(&sblock, cylno)[rpos] == -1)
|
|
fs_rotbl(&sblock)[blk] = 0;
|
|
else
|
|
fs_rotbl(&sblock)[blk] =
|
|
fs_postbl(&sblock, cylno)[rpos] - blk;
|
|
fs_postbl(&sblock, cylno)[rpos] = blk;
|
|
}
|
|
next:
|
|
/*
|
|
* Compute/validate number of cylinder groups.
|
|
*/
|
|
sblock.fs_ncg = sblock.fs_ncyl / sblock.fs_cpg;
|
|
if (sblock.fs_ncyl % sblock.fs_cpg)
|
|
sblock.fs_ncg++;
|
|
sblock.fs_dblkno = sblock.fs_iblkno + sblock.fs_ipg / INOPF(&sblock);
|
|
i = MIN(~sblock.fs_cgmask, sblock.fs_ncg - 1);
|
|
if (cgdmin(&sblock, i) - cgbase(&sblock, i) >= sblock.fs_fpg) {
|
|
printf("inode blocks/cyl group (%d) >= data blocks (%d)\n",
|
|
cgdmin(&sblock, i) - cgbase(&sblock, i) / sblock.fs_frag,
|
|
sblock.fs_fpg / sblock.fs_frag);
|
|
printf("number of cylinders per cylinder group (%d) %s.\n",
|
|
sblock.fs_cpg, "must be increased");
|
|
exit(29);
|
|
}
|
|
j = sblock.fs_ncg - 1;
|
|
if ((i = fssize - j * sblock.fs_fpg) < sblock.fs_fpg &&
|
|
cgdmin(&sblock, j) - cgbase(&sblock, j) > i) {
|
|
if (j == 0) {
|
|
printf("Filesystem must have at least %d sectors\n",
|
|
NSPF(&sblock) *
|
|
(cgdmin(&sblock, 0) + 3 * sblock.fs_frag));
|
|
exit(30);
|
|
}
|
|
printf("Warning: inode blocks/cyl group (%d) >= data blocks (%d) in last\n",
|
|
(cgdmin(&sblock, j) - cgbase(&sblock, j)) / sblock.fs_frag,
|
|
i / sblock.fs_frag);
|
|
printf(" cylinder group. This implies %d sector(s) cannot be allocated.\n",
|
|
i * NSPF(&sblock));
|
|
sblock.fs_ncg--;
|
|
sblock.fs_ncyl -= sblock.fs_ncyl % sblock.fs_cpg;
|
|
sblock.fs_size = fssize = sblock.fs_ncyl * sblock.fs_spc /
|
|
NSPF(&sblock);
|
|
warn = 0;
|
|
}
|
|
if (warn && !mfs) {
|
|
printf("Warning: %d sector(s) in last cylinder unallocated\n",
|
|
sblock.fs_spc -
|
|
(fssize * NSPF(&sblock) - (sblock.fs_ncyl - 1)
|
|
* sblock.fs_spc));
|
|
}
|
|
/*
|
|
* fill in remaining fields of the super block
|
|
*/
|
|
sblock.fs_csaddr = cgdmin(&sblock, 0);
|
|
sblock.fs_cssize =
|
|
fragroundup(&sblock, sblock.fs_ncg * sizeof(struct csum));
|
|
i = sblock.fs_bsize / sizeof(struct csum);
|
|
sblock.fs_csmask = ~(i - 1);
|
|
for (sblock.fs_csshift = 0; i > 1; i >>= 1)
|
|
sblock.fs_csshift++;
|
|
fscs = (struct csum *)calloc(1, sblock.fs_cssize);
|
|
sblock.fs_magic = FS_MAGIC;
|
|
sblock.fs_rotdelay = rotdelay;
|
|
sblock.fs_minfree = minfree;
|
|
sblock.fs_maxcontig = maxcontig;
|
|
sblock.fs_headswitch = headswitch;
|
|
sblock.fs_trkseek = trackseek;
|
|
sblock.fs_maxbpg = maxbpg;
|
|
sblock.fs_rps = rpm / 60;
|
|
sblock.fs_optim = opt;
|
|
sblock.fs_cgrotor = 0;
|
|
sblock.fs_cstotal.cs_ndir = 0;
|
|
sblock.fs_cstotal.cs_nbfree = 0;
|
|
sblock.fs_cstotal.cs_nifree = 0;
|
|
sblock.fs_cstotal.cs_nffree = 0;
|
|
sblock.fs_fmod = 0;
|
|
sblock.fs_ronly = 0;
|
|
sblock.fs_clean = 1;
|
|
/*
|
|
* Dump out summary information about file system.
|
|
*/
|
|
if (!mfs) {
|
|
printf("%s:\t%d sectors in %d %s of %d tracks, %d sectors\n",
|
|
fsys, sblock.fs_size * NSPF(&sblock), sblock.fs_ncyl,
|
|
"cylinders", sblock.fs_ntrak, sblock.fs_nsect);
|
|
#define B2MBFACTOR (1 / (1024.0 * 1024.0))
|
|
printf("\t%.1fMB in %d cyl groups (%d c/g, %.2fMB/g, %d i/g)\n",
|
|
(float)sblock.fs_size * sblock.fs_fsize * B2MBFACTOR,
|
|
sblock.fs_ncg, sblock.fs_cpg,
|
|
(float)sblock.fs_fpg * sblock.fs_fsize * B2MBFACTOR,
|
|
sblock.fs_ipg);
|
|
#undef B2MBFACTOR
|
|
}
|
|
/*
|
|
* Now build the cylinders group blocks and
|
|
* then print out indices of cylinder groups.
|
|
*/
|
|
if (!mfs)
|
|
printf("super-block backups (for fsck -b #) at:\n");
|
|
i = 0;
|
|
width = charsperline();
|
|
for (cylno = 0; cylno < sblock.fs_ncg; cylno++) {
|
|
initcg(cylno, utime);
|
|
if (mfs)
|
|
continue;
|
|
j = sprintf(tmpbuf, " %d,",
|
|
fsbtodb(&sblock, cgsblock(&sblock, cylno)));
|
|
if (i+j >= width) {
|
|
printf("\n");
|
|
i = 0;
|
|
}
|
|
i += j;
|
|
printf("%s", tmpbuf);
|
|
fflush(stdout);
|
|
}
|
|
if (!mfs)
|
|
printf("\n");
|
|
if (Nflag && !mfs)
|
|
exit(0);
|
|
/*
|
|
* Now construct the initial file system,
|
|
* then write out the super-block.
|
|
*/
|
|
fsinit(utime);
|
|
sblock.fs_time = utime;
|
|
wtfs((int)SBOFF / sectorsize, sbsize, (char *)&sblock);
|
|
for (i = 0; i < sblock.fs_cssize; i += sblock.fs_bsize)
|
|
wtfs(fsbtodb(&sblock, sblock.fs_csaddr + numfrags(&sblock, i)),
|
|
sblock.fs_cssize - i < sblock.fs_bsize ?
|
|
sblock.fs_cssize - i : sblock.fs_bsize,
|
|
((char *)fscs) + i);
|
|
/*
|
|
* Write out the duplicate super blocks
|
|
*/
|
|
for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
|
|
wtfs(fsbtodb(&sblock, cgsblock(&sblock, cylno)),
|
|
sbsize, (char *)&sblock);
|
|
/*
|
|
* Update information about this partion in pack
|
|
* label, to that it may be updated on disk.
|
|
*/
|
|
pp->p_fstype = FS_BSDFFS;
|
|
pp->p_fsize = sblock.fs_fsize;
|
|
pp->p_frag = sblock.fs_frag;
|
|
pp->p_cpg = sblock.fs_cpg;
|
|
/*
|
|
* Notify parent process of success.
|
|
* Dissociate from session and tty.
|
|
*/
|
|
if (mfs) {
|
|
kill(ppid, SIGUSR1);
|
|
(void) setsid();
|
|
(void) close(0);
|
|
(void) close(1);
|
|
(void) close(2);
|
|
(void) chdir("/");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Initialize a cylinder group.
|
|
*/
|
|
initcg(cylno, utime)
|
|
int cylno;
|
|
time_t utime;
|
|
{
|
|
daddr_t cbase, d, dlower, dupper, dmax, blkno;
|
|
long i, j, s;
|
|
register struct csum *cs;
|
|
|
|
/*
|
|
* Determine block bounds for cylinder group.
|
|
* Allow space for super block summary information in first
|
|
* cylinder group.
|
|
*/
|
|
cbase = cgbase(&sblock, cylno);
|
|
dmax = cbase + sblock.fs_fpg;
|
|
if (dmax > sblock.fs_size)
|
|
dmax = sblock.fs_size;
|
|
dlower = cgsblock(&sblock, cylno) - cbase;
|
|
dupper = cgdmin(&sblock, cylno) - cbase;
|
|
if (cylno == 0)
|
|
dupper += howmany(sblock.fs_cssize, sblock.fs_fsize);
|
|
cs = fscs + cylno;
|
|
bzero(&acg, sblock.fs_cgsize);
|
|
acg.cg_time = utime;
|
|
acg.cg_magic = CG_MAGIC;
|
|
acg.cg_cgx = cylno;
|
|
if (cylno == sblock.fs_ncg - 1)
|
|
acg.cg_ncyl = sblock.fs_ncyl % sblock.fs_cpg;
|
|
else
|
|
acg.cg_ncyl = sblock.fs_cpg;
|
|
acg.cg_niblk = sblock.fs_ipg;
|
|
acg.cg_ndblk = dmax - cbase;
|
|
if (sblock.fs_contigsumsize > 0)
|
|
acg.cg_nclusterblks = acg.cg_ndblk / sblock.fs_frag;
|
|
acg.cg_btotoff = &acg.cg_space[0] - (u_char *)(&acg.cg_link);
|
|
acg.cg_boff = acg.cg_btotoff + sblock.fs_cpg * sizeof(long);
|
|
acg.cg_iusedoff = acg.cg_boff +
|
|
sblock.fs_cpg * sblock.fs_nrpos * sizeof(short);
|
|
acg.cg_freeoff = acg.cg_iusedoff + howmany(sblock.fs_ipg, NBBY);
|
|
if (sblock.fs_contigsumsize <= 0) {
|
|
acg.cg_nextfreeoff = acg.cg_freeoff +
|
|
howmany(sblock.fs_cpg * sblock.fs_spc / NSPF(&sblock), NBBY);
|
|
} else {
|
|
acg.cg_clustersumoff = acg.cg_freeoff + howmany
|
|
(sblock.fs_cpg * sblock.fs_spc / NSPF(&sblock), NBBY) -
|
|
sizeof(long);
|
|
acg.cg_clustersumoff =
|
|
roundup(acg.cg_clustersumoff, sizeof(long));
|
|
acg.cg_clusteroff = acg.cg_clustersumoff +
|
|
(sblock.fs_contigsumsize + 1) * sizeof(long);
|
|
acg.cg_nextfreeoff = acg.cg_clusteroff + howmany
|
|
(sblock.fs_cpg * sblock.fs_spc / NSPB(&sblock), NBBY);
|
|
}
|
|
if (acg.cg_nextfreeoff - (long)(&acg.cg_link) > sblock.fs_cgsize) {
|
|
printf("Panic: cylinder group too big\n");
|
|
exit(37);
|
|
}
|
|
acg.cg_cs.cs_nifree += sblock.fs_ipg;
|
|
if (cylno == 0)
|
|
for (i = 0; i < ROOTINO; i++) {
|
|
setbit(cg_inosused(&acg), i);
|
|
acg.cg_cs.cs_nifree--;
|
|
}
|
|
for (i = 0; i < sblock.fs_ipg / INOPF(&sblock); i += sblock.fs_frag)
|
|
wtfs(fsbtodb(&sblock, cgimin(&sblock, cylno) + i),
|
|
sblock.fs_bsize, (char *)zino);
|
|
if (cylno > 0) {
|
|
/*
|
|
* In cylno 0, beginning space is reserved
|
|
* for boot and super blocks.
|
|
*/
|
|
for (d = 0; d < dlower; d += sblock.fs_frag) {
|
|
blkno = d / sblock.fs_frag;
|
|
setblock(&sblock, cg_blksfree(&acg), blkno);
|
|
if (sblock.fs_contigsumsize > 0)
|
|
setbit(cg_clustersfree(&acg), blkno);
|
|
acg.cg_cs.cs_nbfree++;
|
|
cg_blktot(&acg)[cbtocylno(&sblock, d)]++;
|
|
cg_blks(&sblock, &acg, cbtocylno(&sblock, d))
|
|
[cbtorpos(&sblock, d)]++;
|
|
}
|
|
sblock.fs_dsize += dlower;
|
|
}
|
|
sblock.fs_dsize += acg.cg_ndblk - dupper;
|
|
if (i = dupper % sblock.fs_frag) {
|
|
acg.cg_frsum[sblock.fs_frag - i]++;
|
|
for (d = dupper + sblock.fs_frag - i; dupper < d; dupper++) {
|
|
setbit(cg_blksfree(&acg), dupper);
|
|
acg.cg_cs.cs_nffree++;
|
|
}
|
|
}
|
|
for (d = dupper; d + sblock.fs_frag <= dmax - cbase; ) {
|
|
blkno = d / sblock.fs_frag;
|
|
setblock(&sblock, cg_blksfree(&acg), blkno);
|
|
if (sblock.fs_contigsumsize > 0)
|
|
setbit(cg_clustersfree(&acg), blkno);
|
|
acg.cg_cs.cs_nbfree++;
|
|
cg_blktot(&acg)[cbtocylno(&sblock, d)]++;
|
|
cg_blks(&sblock, &acg, cbtocylno(&sblock, d))
|
|
[cbtorpos(&sblock, d)]++;
|
|
d += sblock.fs_frag;
|
|
}
|
|
if (d < dmax - cbase) {
|
|
acg.cg_frsum[dmax - cbase - d]++;
|
|
for (; d < dmax - cbase; d++) {
|
|
setbit(cg_blksfree(&acg), d);
|
|
acg.cg_cs.cs_nffree++;
|
|
}
|
|
}
|
|
if (sblock.fs_contigsumsize > 0) {
|
|
long *sump = cg_clustersum(&acg);
|
|
u_char *mapp = cg_clustersfree(&acg);
|
|
int map = *mapp++;
|
|
int bit = 1;
|
|
int run = 0;
|
|
|
|
for (i = 0; i < acg.cg_nclusterblks; i++) {
|
|
if ((map & bit) != 0) {
|
|
run++;
|
|
} else if (run != 0) {
|
|
if (run > sblock.fs_contigsumsize)
|
|
run = sblock.fs_contigsumsize;
|
|
sump[run]++;
|
|
run = 0;
|
|
}
|
|
if ((i & (NBBY - 1)) != (NBBY - 1)) {
|
|
bit <<= 1;
|
|
} else {
|
|
map = *mapp++;
|
|
bit = 1;
|
|
}
|
|
}
|
|
if (run != 0) {
|
|
if (run > sblock.fs_contigsumsize)
|
|
run = sblock.fs_contigsumsize;
|
|
sump[run]++;
|
|
}
|
|
}
|
|
sblock.fs_cstotal.cs_ndir += acg.cg_cs.cs_ndir;
|
|
sblock.fs_cstotal.cs_nffree += acg.cg_cs.cs_nffree;
|
|
sblock.fs_cstotal.cs_nbfree += acg.cg_cs.cs_nbfree;
|
|
sblock.fs_cstotal.cs_nifree += acg.cg_cs.cs_nifree;
|
|
*cs = acg.cg_cs;
|
|
wtfs(fsbtodb(&sblock, cgtod(&sblock, cylno)),
|
|
sblock.fs_bsize, (char *)&acg);
|
|
}
|
|
|
|
/*
|
|
* initialize the file system
|
|
*/
|
|
struct dinode node;
|
|
|
|
#ifdef LOSTDIR
|
|
#define PREDEFDIR 3
|
|
#else
|
|
#define PREDEFDIR 2
|
|
#endif
|
|
|
|
struct direct root_dir[] = {
|
|
{ ROOTINO, sizeof(struct direct), DT_DIR, 1, "." },
|
|
{ ROOTINO, sizeof(struct direct), DT_DIR, 2, ".." },
|
|
#ifdef LOSTDIR
|
|
{ LOSTFOUNDINO, sizeof(struct direct), DT_DIR, 10, "lost+found" },
|
|
#endif
|
|
};
|
|
struct odirect {
|
|
u_long d_ino;
|
|
u_short d_reclen;
|
|
u_short d_namlen;
|
|
u_char d_name[MAXNAMLEN + 1];
|
|
} oroot_dir[] = {
|
|
{ ROOTINO, sizeof(struct direct), 1, "." },
|
|
{ ROOTINO, sizeof(struct direct), 2, ".." },
|
|
#ifdef LOSTDIR
|
|
{ LOSTFOUNDINO, sizeof(struct direct), 10, "lost+found" },
|
|
#endif
|
|
};
|
|
#ifdef LOSTDIR
|
|
struct direct lost_found_dir[] = {
|
|
{ LOSTFOUNDINO, sizeof(struct direct), DT_DIR, 1, "." },
|
|
{ ROOTINO, sizeof(struct direct), DT_DIR, 2, ".." },
|
|
{ 0, DIRBLKSIZ, 0, 0, 0 },
|
|
};
|
|
struct odirect olost_found_dir[] = {
|
|
{ LOSTFOUNDINO, sizeof(struct direct), 1, "." },
|
|
{ ROOTINO, sizeof(struct direct), 2, ".." },
|
|
{ 0, DIRBLKSIZ, 0, 0 },
|
|
};
|
|
#endif
|
|
char buf[MAXBSIZE];
|
|
|
|
fsinit(utime)
|
|
time_t utime;
|
|
{
|
|
int i;
|
|
|
|
/*
|
|
* initialize the node
|
|
*/
|
|
node.di_atime.tv_sec = utime;
|
|
node.di_mtime.tv_sec = utime;
|
|
node.di_ctime.tv_sec = utime;
|
|
#ifdef LOSTDIR
|
|
/*
|
|
* create the lost+found directory
|
|
*/
|
|
if (Oflag) {
|
|
(void)makedir((struct direct *)olost_found_dir, 2);
|
|
for (i = DIRBLKSIZ; i < sblock.fs_bsize; i += DIRBLKSIZ)
|
|
bcopy(&olost_found_dir[2], &buf[i],
|
|
DIRSIZ(0, &olost_found_dir[2]));
|
|
} else {
|
|
(void)makedir(lost_found_dir, 2);
|
|
for (i = DIRBLKSIZ; i < sblock.fs_bsize; i += DIRBLKSIZ)
|
|
bcopy(&lost_found_dir[2], &buf[i],
|
|
DIRSIZ(0, &lost_found_dir[2]));
|
|
}
|
|
node.di_mode = IFDIR | UMASK;
|
|
node.di_nlink = 2;
|
|
node.di_size = sblock.fs_bsize;
|
|
node.di_db[0] = alloc(node.di_size, node.di_mode);
|
|
node.di_blocks = btodb(fragroundup(&sblock, node.di_size));
|
|
wtfs(fsbtodb(&sblock, node.di_db[0]), node.di_size, buf);
|
|
iput(&node, LOSTFOUNDINO);
|
|
#endif
|
|
/*
|
|
* create the root directory
|
|
*/
|
|
if (mfs)
|
|
node.di_mode = IFDIR | 01777;
|
|
else
|
|
node.di_mode = IFDIR | UMASK;
|
|
node.di_nlink = PREDEFDIR;
|
|
if (Oflag)
|
|
node.di_size = makedir((struct direct *)oroot_dir, PREDEFDIR);
|
|
else
|
|
node.di_size = makedir(root_dir, PREDEFDIR);
|
|
node.di_db[0] = alloc(sblock.fs_fsize, node.di_mode);
|
|
node.di_blocks = btodb(fragroundup(&sblock, node.di_size));
|
|
wtfs(fsbtodb(&sblock, node.di_db[0]), sblock.fs_fsize, buf);
|
|
iput(&node, ROOTINO);
|
|
}
|
|
|
|
/*
|
|
* construct a set of directory entries in "buf".
|
|
* return size of directory.
|
|
*/
|
|
makedir(protodir, entries)
|
|
register struct direct *protodir;
|
|
int entries;
|
|
{
|
|
char *cp;
|
|
int i, spcleft;
|
|
|
|
spcleft = DIRBLKSIZ;
|
|
for (cp = buf, i = 0; i < entries - 1; i++) {
|
|
protodir[i].d_reclen = DIRSIZ(0, &protodir[i]);
|
|
bcopy(&protodir[i], cp, protodir[i].d_reclen);
|
|
cp += protodir[i].d_reclen;
|
|
spcleft -= protodir[i].d_reclen;
|
|
}
|
|
protodir[i].d_reclen = spcleft;
|
|
bcopy(&protodir[i], cp, DIRSIZ(0, &protodir[i]));
|
|
return (DIRBLKSIZ);
|
|
}
|
|
|
|
/*
|
|
* allocate a block or frag
|
|
*/
|
|
daddr_t
|
|
alloc(size, mode)
|
|
int size;
|
|
int mode;
|
|
{
|
|
int i, frag;
|
|
daddr_t d, blkno;
|
|
|
|
rdfs(fsbtodb(&sblock, cgtod(&sblock, 0)), sblock.fs_cgsize,
|
|
(char *)&acg);
|
|
if (acg.cg_magic != CG_MAGIC) {
|
|
printf("cg 0: bad magic number\n");
|
|
return (0);
|
|
}
|
|
if (acg.cg_cs.cs_nbfree == 0) {
|
|
printf("first cylinder group ran out of space\n");
|
|
return (0);
|
|
}
|
|
for (d = 0; d < acg.cg_ndblk; d += sblock.fs_frag)
|
|
if (isblock(&sblock, cg_blksfree(&acg), d / sblock.fs_frag))
|
|
goto goth;
|
|
printf("internal error: can't find block in cyl 0\n");
|
|
return (0);
|
|
goth:
|
|
blkno = fragstoblks(&sblock, d);
|
|
clrblock(&sblock, cg_blksfree(&acg), blkno);
|
|
clrbit(cg_clustersfree(&acg), blkno);
|
|
acg.cg_cs.cs_nbfree--;
|
|
sblock.fs_cstotal.cs_nbfree--;
|
|
fscs[0].cs_nbfree--;
|
|
if (mode & IFDIR) {
|
|
acg.cg_cs.cs_ndir++;
|
|
sblock.fs_cstotal.cs_ndir++;
|
|
fscs[0].cs_ndir++;
|
|
}
|
|
cg_blktot(&acg)[cbtocylno(&sblock, d)]--;
|
|
cg_blks(&sblock, &acg, cbtocylno(&sblock, d))[cbtorpos(&sblock, d)]--;
|
|
if (size != sblock.fs_bsize) {
|
|
frag = howmany(size, sblock.fs_fsize);
|
|
fscs[0].cs_nffree += sblock.fs_frag - frag;
|
|
sblock.fs_cstotal.cs_nffree += sblock.fs_frag - frag;
|
|
acg.cg_cs.cs_nffree += sblock.fs_frag - frag;
|
|
acg.cg_frsum[sblock.fs_frag - frag]++;
|
|
for (i = frag; i < sblock.fs_frag; i++)
|
|
setbit(cg_blksfree(&acg), d + i);
|
|
}
|
|
wtfs(fsbtodb(&sblock, cgtod(&sblock, 0)), sblock.fs_cgsize,
|
|
(char *)&acg);
|
|
return (d);
|
|
}
|
|
|
|
/*
|
|
* Allocate an inode on the disk
|
|
*/
|
|
iput(ip, ino)
|
|
register struct dinode *ip;
|
|
register ino_t ino;
|
|
{
|
|
struct dinode buf[MAXINOPB];
|
|
daddr_t d;
|
|
int c;
|
|
|
|
c = ino_to_cg(&sblock, ino);
|
|
rdfs(fsbtodb(&sblock, cgtod(&sblock, 0)), sblock.fs_cgsize,
|
|
(char *)&acg);
|
|
if (acg.cg_magic != CG_MAGIC) {
|
|
printf("cg 0: bad magic number\n");
|
|
exit(31);
|
|
}
|
|
acg.cg_cs.cs_nifree--;
|
|
setbit(cg_inosused(&acg), ino);
|
|
wtfs(fsbtodb(&sblock, cgtod(&sblock, 0)), sblock.fs_cgsize,
|
|
(char *)&acg);
|
|
sblock.fs_cstotal.cs_nifree--;
|
|
fscs[0].cs_nifree--;
|
|
if (ino >= sblock.fs_ipg * sblock.fs_ncg) {
|
|
printf("fsinit: inode value out of range (%d).\n", ino);
|
|
exit(32);
|
|
}
|
|
d = fsbtodb(&sblock, ino_to_fsba(&sblock, ino));
|
|
rdfs(d, sblock.fs_bsize, buf);
|
|
buf[ino_to_fsbo(&sblock, ino)] = *ip;
|
|
wtfs(d, sblock.fs_bsize, buf);
|
|
}
|
|
|
|
/*
|
|
* Notify parent process that the filesystem has created itself successfully.
|
|
*/
|
|
void
|
|
started()
|
|
{
|
|
|
|
exit(0);
|
|
}
|
|
|
|
/*
|
|
* Replace libc function with one suited to our needs.
|
|
*/
|
|
caddr_t
|
|
malloc(size)
|
|
register u_long size;
|
|
{
|
|
char *base, *i;
|
|
static u_long pgsz;
|
|
struct rlimit rlp;
|
|
|
|
if (pgsz == 0) {
|
|
base = sbrk(0);
|
|
pgsz = getpagesize() - 1;
|
|
i = (char *)((u_long)(base + pgsz) &~ pgsz);
|
|
base = sbrk(i - base);
|
|
if (getrlimit(RLIMIT_DATA, &rlp) < 0)
|
|
perror("getrlimit");
|
|
rlp.rlim_cur = rlp.rlim_max;
|
|
if (setrlimit(RLIMIT_DATA, &rlp) < 0)
|
|
perror("setrlimit");
|
|
memleft = rlp.rlim_max - (u_long)base;
|
|
}
|
|
size = (size + pgsz) &~ pgsz;
|
|
if (size > memleft)
|
|
size = memleft;
|
|
memleft -= size;
|
|
if (size == 0)
|
|
return (0);
|
|
return ((caddr_t)sbrk(size));
|
|
}
|
|
|
|
/*
|
|
* Replace libc function with one suited to our needs.
|
|
*/
|
|
caddr_t
|
|
realloc(ptr, size)
|
|
char *ptr;
|
|
u_long size;
|
|
{
|
|
void *p;
|
|
|
|
if ((p = malloc(size)) == NULL)
|
|
return (NULL);
|
|
bcopy(ptr, p, size);
|
|
free(ptr);
|
|
return (p);
|
|
}
|
|
|
|
/*
|
|
* Replace libc function with one suited to our needs.
|
|
*/
|
|
char *
|
|
calloc(size, numelm)
|
|
u_long size, numelm;
|
|
{
|
|
caddr_t base;
|
|
|
|
size *= numelm;
|
|
base = malloc(size);
|
|
bzero(base, size);
|
|
return (base);
|
|
}
|
|
|
|
/*
|
|
* Replace libc function with one suited to our needs.
|
|
*/
|
|
free(ptr)
|
|
char *ptr;
|
|
{
|
|
|
|
/* do not worry about it for now */
|
|
}
|
|
|
|
/*
|
|
* read a block from the file system
|
|
*/
|
|
rdfs(bno, size, bf)
|
|
daddr_t bno;
|
|
int size;
|
|
char *bf;
|
|
{
|
|
int n;
|
|
|
|
if (mfs) {
|
|
bcopy(membase + bno * sectorsize, bf, size);
|
|
return;
|
|
}
|
|
if (lseek(fsi, (off_t)bno * sectorsize, 0) < 0) {
|
|
printf("seek error: %ld\n", bno);
|
|
perror("rdfs");
|
|
exit(33);
|
|
}
|
|
n = read(fsi, bf, size);
|
|
if (n != size) {
|
|
printf("read error: %ld\n", bno);
|
|
perror("rdfs");
|
|
exit(34);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* write a block to the file system
|
|
*/
|
|
wtfs(bno, size, bf)
|
|
daddr_t bno;
|
|
int size;
|
|
char *bf;
|
|
{
|
|
int n;
|
|
|
|
if (mfs) {
|
|
bcopy(bf, membase + bno * sectorsize, size);
|
|
return;
|
|
}
|
|
if (Nflag)
|
|
return;
|
|
if (lseek(fso, (off_t)bno * sectorsize, SEEK_SET) < 0) {
|
|
printf("seek error: %ld\n", bno);
|
|
perror("wtfs");
|
|
exit(35);
|
|
}
|
|
n = write(fso, bf, size);
|
|
if (n != size) {
|
|
printf("write error: %ld\n", bno);
|
|
perror("wtfs");
|
|
exit(36);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* check if a block is available
|
|
*/
|
|
isblock(fs, cp, h)
|
|
struct fs *fs;
|
|
unsigned char *cp;
|
|
int h;
|
|
{
|
|
unsigned char mask;
|
|
|
|
switch (fs->fs_frag) {
|
|
case 8:
|
|
return (cp[h] == 0xff);
|
|
case 4:
|
|
mask = 0x0f << ((h & 0x1) << 2);
|
|
return ((cp[h >> 1] & mask) == mask);
|
|
case 2:
|
|
mask = 0x03 << ((h & 0x3) << 1);
|
|
return ((cp[h >> 2] & mask) == mask);
|
|
case 1:
|
|
mask = 0x01 << (h & 0x7);
|
|
return ((cp[h >> 3] & mask) == mask);
|
|
default:
|
|
#ifdef STANDALONE
|
|
printf("isblock bad fs_frag %d\n", fs->fs_frag);
|
|
#else
|
|
fprintf(stderr, "isblock bad fs_frag %d\n", fs->fs_frag);
|
|
#endif
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* take a block out of the map
|
|
*/
|
|
clrblock(fs, cp, h)
|
|
struct fs *fs;
|
|
unsigned char *cp;
|
|
int h;
|
|
{
|
|
switch ((fs)->fs_frag) {
|
|
case 8:
|
|
cp[h] = 0;
|
|
return;
|
|
case 4:
|
|
cp[h >> 1] &= ~(0x0f << ((h & 0x1) << 2));
|
|
return;
|
|
case 2:
|
|
cp[h >> 2] &= ~(0x03 << ((h & 0x3) << 1));
|
|
return;
|
|
case 1:
|
|
cp[h >> 3] &= ~(0x01 << (h & 0x7));
|
|
return;
|
|
default:
|
|
#ifdef STANDALONE
|
|
printf("clrblock bad fs_frag %d\n", fs->fs_frag);
|
|
#else
|
|
fprintf(stderr, "clrblock bad fs_frag %d\n", fs->fs_frag);
|
|
#endif
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* put a block into the map
|
|
*/
|
|
setblock(fs, cp, h)
|
|
struct fs *fs;
|
|
unsigned char *cp;
|
|
int h;
|
|
{
|
|
switch (fs->fs_frag) {
|
|
case 8:
|
|
cp[h] = 0xff;
|
|
return;
|
|
case 4:
|
|
cp[h >> 1] |= (0x0f << ((h & 0x1) << 2));
|
|
return;
|
|
case 2:
|
|
cp[h >> 2] |= (0x03 << ((h & 0x3) << 1));
|
|
return;
|
|
case 1:
|
|
cp[h >> 3] |= (0x01 << (h & 0x7));
|
|
return;
|
|
default:
|
|
#ifdef STANDALONE
|
|
printf("setblock bad fs_frag %d\n", fs->fs_frag);
|
|
#else
|
|
fprintf(stderr, "setblock bad fs_frag %d\n", fs->fs_frag);
|
|
#endif
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Determine the number of characters in a
|
|
* single line.
|
|
*/
|
|
|
|
static int
|
|
charsperline()
|
|
{
|
|
int columns;
|
|
char *cp;
|
|
struct winsize ws;
|
|
extern char *getenv();
|
|
|
|
columns = 0;
|
|
if (ioctl(0, TIOCGWINSZ, &ws) != -1)
|
|
columns = ws.ws_col;
|
|
if (columns == 0 && (cp = getenv("COLUMNS")))
|
|
columns = atoi(cp);
|
|
if (columns == 0)
|
|
columns = 80; /* last resort */
|
|
return columns;
|
|
}
|