CC: to -current as that's what I'm running.
"John W. De Boskey" wrote:
>
> Hi,
>
> I can't answer your questions directly, but you might want
> to checkout the sources to newfs (/usr/src/sbin/newfs/newfs.c or
> http://www.FreeBSD.org/cgi/cvsweb.cgi/src/sbin/newfs/newfs.c?annotate=1.31
> line 417).
>
> I'll be glad to review your program if you would like.
I'm not after a review, I'd like FreeBSD-CURRENT fixed.
The program works on Compaq True64 UNIX v 4.0d
It also works on Solaris 7 (only tested sparc).
So it seems FreeBSD is broken here.
> -john
> [EMAIL PROTECTED]
>
> ----- Matthew Thyer's Original Message -----
> > Attached is scrub.c used to scrub a hard disk.
> >
> > Examine the lines:
> >
> > /* if ( (fd = open("/dev/da12s1c",O_RDWR)) < 0 ) { */
> > if ( (fd = open("/mnt/foo",O_RDWR)) < 0 ) {
> >
> >
> > If I newfs the 'a' partition of da12s1 (a is the same as 'c'), mount
> > it as /mnt, touch the file foo and then run the program it works fine.
> >
> > If instead I open the c partition (as in the commented out line),
> > the open succeeds, the lseek succeeds but the writes fail with an
> > error saying read only filesystem.
> >
> > Why ??
> >
> > I want to scrub the whole disk, not just write to a file.
> >
> > --
> > Matthew Thyer Phone: +61 8 8259 7249
> > Science Corporate Information Systems Fax: +61 8 8259 5537
> > Defence Science and Technology Organisation, Salisbury
> > PO Box 1500 Salisbury South Australia 5108
> >
> > #include <sys/types.h>
> > #include <sys/stat.h>
> > #include <fcntl.h>
> >
> > #include <sys/uio.h>
> > #include <unistd.h>
> >
> > #define BUFSIZE 8192
> >
> >
> > main()
> > {
> > /* program to write 1's and 0's to disk */
> >
> > off_t result;
> > long int i;
> > long int nwrite;
> > long int count;
> > int passes;
> > int fd;
> > char buf0[BUFSIZE], buf1[BUFSIZE];
> >
> > /* initialize write buffers */
> >
> > for (i=0; i < BUFSIZE; i++) {
> > buf0[i] = 0;
> > buf1[i] = 1;
> > }
> >
> > /* if ( (fd = open("/dev/da12s1c",O_RDWR)) < 0 ) { */
> > if ( (fd = open("/mnt/foo",O_RDWR)) < 0 ) {
> > perror("open");
> > exit(1);
> > }
> >
> > /* write alternating 1s and zeros to disk */
> >
> > for (i = 1; i <= 5; i++) {
> >
> > /* rewind to start file partition */
> > if ((result = lseek(fd, 0L, SEEK_SET)) != 0) {
> > perror("lseek");
> > exit(1);
> > }
> > count = 0L;
> > do {
> >
> > if ( (nwrite = write(fd, buf0, BUFSIZE)) != BUFSIZE) {
> > printf("wrote last %ld bytes to disk\n",nwrite);
> > printf("Total bytes written were %ld bytes\n",
> > BUFSIZE*count + nwrite);
> > perror("write");
> > }
> > else {
> > ++count;
> > if ( count % 1000 == 0)
> > printf("overwrote %ld bytes w/ 0s\n",
> > BUFSIZE*count);
> > }
> >
> > } while ( nwrite == BUFSIZE && nwrite > 0 );
> >
> > /* rewind to start file partition */
> > if ((result = lseek(fd, 0L, SEEK_SET)) != 0) {
> > perror("lseek");
> > exit(1);
> > }
> > count = 0L;
> >
> > do {
> > if ( (nwrite = write(fd, buf1, BUFSIZE)) != BUFSIZE) {
> > printf("wrote last %ld bytes to disk\n",nwrite);
> > printf("Total bytes written were %ld bytes\n",
> > BUFSIZE*count + nwrite);
> > perror("write");
> > }
> > else {
> > ++count;
> > if ( count % 1000 == 0)
> > printf("overwrote %ld bytes w/ 1s\n",
> > BUFSIZE*count);
> > }
> >
> > } while ( nwrite == BUFSIZE && nwrite > 0 );
> >
> > printf("Pass %d complete\n",i);
> > }
> > printf("All passes complete\n");
> > }
--
Matthew Thyer Phone: +61 8 8259 7249
Science Corporate Information Systems Fax: +61 8 8259 5537
Defence Science and Technology Organisation, Salisbury
PO Box 1500 Salisbury South Australia 5108
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