Date: Tue, 30 May 1995 08:00:04 -0700 From: mark tinguely <tinguely@opus.cs.ndsu.NoDak.edu> To: freebsd-bugs Subject: bin/461: Bogus lseek warning when dump large filesystems Message-ID: <199505301500.IAA14988@freefall.cdrom.com> In-Reply-To: Your message of Tue, 30 May 1995 09:53:06 -0500 <199505301453.JAA00642@opus.cs.ndsu.NoDak.edu>
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>Number: 461
>Category: bin
>Synopsis: Bogus lseek warning when dump large filesystems
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs (FreeBSD bugs mailing list)
>State: open
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue May 30 08:00:02 1995
>Originator: Mark Tinguely
>Organization:
North Dakota State University
>Release: FreeBSD 2.1.0-Development i386
>Environment:
>Description:
When using dump/rdump on large filesytems (my case 3 GB), the lseek
claims multiple times to have failed. The problem is a off_t is
converted into a int and checked for a negative. A true lseek check
should be checking if the off_t is equal to -1 for failure.
>How-To-Repeat:
run dump on a large (> 2GB) filesystem
>Fix:
since the lseek is set from the beginning of the filesystem, I simple
check if the lseek returned the offset that was requested. maybe a
more efficent test would be a test for -1.
I never got the "lseek2" error message, but I changed that as well
just in case.
*** traverse.c.orig Thu May 26 01:34:03 1994
--- traverse.c Tue May 30 09:36:15 1995
***************
*** 558,564 ****
extern int errno;
loop:
! if ((int)lseek(diskfd, ((off_t)blkno << dev_bshift), 0) < 0)
msg("bread: lseek fails\n");
if ((cnt = read(diskfd, buf, size)) == size)
return;
--- 558,565 ----
extern int errno;
loop:
! if (lseek(diskfd, ((off_t)blkno << dev_bshift), 0) !=
! ((off_t)blkno << dev_bshift))
msg("bread: lseek fails\n");
if ((cnt = read(diskfd, buf, size)) == size)
return;
***************
*** 598,604 ****
*/
bzero(buf, size);
for (i = 0; i < size; i += dev_bsize, buf += dev_bsize, blkno++) {
! if ((int)lseek(diskfd, ((off_t)blkno << dev_bshift), 0) < 0)
msg("bread: lseek2 fails!\n");
if ((cnt = read(diskfd, buf, (int)dev_bsize)) == dev_bsize)
continue;
--- 599,606 ----
*/
bzero(buf, size);
for (i = 0; i < size; i += dev_bsize, buf += dev_bsize, blkno++) {
! if (lseek(diskfd, ((off_t)blkno << dev_bshift), 0) !=
! ((off_t)blkno << dev_bshift))
msg("bread: lseek2 fails!\n");
if ((cnt = read(diskfd, buf, (int)dev_bsize)) == dev_bsize)
continue;
>Audit-Trail:
>Unformatted:
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