initial import of NetBSD tree

1 files changed, 161 insertions, 0 deletions

diff --git a/sys/arch/i386/stand/fs.c b/sys/arch/i386/stand/fs.c
new file mode 100644
index 00000000000..bb964d93130
--- /dev/null
+++ b/sys/arch/i386/stand/fs.c
@@ -0,0 +1,161 @@
+/*	$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);
+}