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/* $NetBSD: fs.c,v 1.3 1994/10/27 04:21:54 cgd Exp $ */
/*
* Copyright (c) 1992 William F. Jolitz, TeleMuse
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This software is a component of "386BSD" developed by
William F. Jolitz, TeleMuse.
* 4. Neither the name of the developer nor the name "386BSD"
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ
* AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS
* SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT.
* THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT
* NOT MAKE USE THIS WORK.
*
* FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED
* BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN
* REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES
* (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING
* JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND
* LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE
* ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS
* OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992.
*
* THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Routines to sift through a BSD fast filesystem. -wfj
*/
#include "param.h"
#include "fs.h"
#include "dir.h"
#include "dinode.h"
#include "saio.h"
int bdev;
char superb[SBSIZE], abuf[MAXBSIZE];
struct fs *fs;
/*
* Translate name to inode number.
*/
namei(s) char *s; {
int ino;
struct dinode rd;
/*printf("namei %s\n", s);*/
if (!fs) {
bread(bdev, SBOFF/DEV_BSIZE, superb, SBSIZE);
fs = (struct fs *)superb;
}
fetchi(2, &rd);
return(ilookup(&rd, s));
}
/*
* look for a file in this inode.
*/
ilookup(dip, s) struct dinode *dip; char *s; {
struct direct dirent;
int off;
/*printf("ilookup %x %s %d\n", dip, s, dip->di_size);*/
off = 0;
do {
iread(dip, off, (char *)&dirent, sizeof(struct direct));
off += dirent.d_reclen;
/*printf("%s ", dirent.d_name);*/
if (strcmp (dirent.d_name, s) == 0)
return (dirent.d_ino);
} while (off < dip->di_size && dirent.d_reclen);
return (0);
}
/*
* Extract an inode and return it.
*/
fetchi(i, dip) struct dinode *dip; {
/*printf("fetchi %d %x\n", i, dip);*/
bread(bdev, fsbtodb(fs, itod(fs, i)), abuf, fs->fs_bsize);
bcopy (abuf + itoo(fs,i) * sizeof(struct dinode),
dip, sizeof(struct dinode));
/*printf("mode %o link %d uid %d gid %d size %d [ ",
dip->di_mode, dip->di_nlink, dip->di_uid, dip->di_gid, dip->di_size);
for (i=0; i < NDADDR; i++)
printf("%d ", dip->di_db[i]);
printf("] (");
for (i=0; i < NIADDR; i++)
printf("%d ", dip->di_ib[i]);
printf(")\n");*/
}
/*
* Read data contents of an inode
*/
iread(dip, off, p, sz)
struct dinode *dip;
char *p;
{
daddr_t physblock;
int va = sz;
char *op, *pp;
/*printf("iread %x %d %x %d\n", dip, off, p, sz);*/
while (sz > 0) {
int lbn, bs, o;
lbn = lblkno(fs, off);
bs = dblksize(fs, dip, lbn);
o = blkoff(fs, off);
/* logical to physical translation */
bmap(dip, lbn, &physblock);
/* if sz larger than blksize, i/o direct,
otherwise to local buffer */
if (o == 0 && bs <= sz)
bread(bdev, physblock, p, bs);
else {
bread(bdev, physblock, abuf, bs);
bs -= o;
bs = bs > sz ? sz : bs;
bcopy(abuf + o, p, bs);
}
/*printf("bs %d sz %d", bs, sz);*/
sz -= bs;
p += bs;
off += bs;
if (bs==0) break;
}
return(va);
}
_stop(s) {
printf("Failed:%s\n", s);
exit(0);
}
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