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Subject2.4.2-SMP: problem locking nfs files mounted on HPUX (ENOLCK)
Hi, all

i'm trying to lock a file using advisory locks.
The file is on the filesystem exported by a linux machine
(RH 6.2, 2.4.2-SMP). The filesystem is mounted on HP-UX B.11.00
(HP-UX host1 B.11.00 A 9000/785 2011306912 two-user license).
Right now i cannot try this with the newer kernels.

The following simple program fails with ENOLCK.

#define _GNU_SOURCE
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>

int main(int c, char **v)
{
for (++v, --c; c--; ++v) {
struct flock lck = {F_RDLCK, SEEK_SET, 0, 0}; /* whole file */
int fd = open(*v, O_RDONLY);
if ( fd < 0 )
fprintf(stderr, "%s: %s\n", *v, strerror(errno));
else {
if ( fcntl(fd, F_SETLK, &lck) < 0 )
fprintf(stderr, "%s[%d]: %s\n", *v, lck.l_pid, strerror(errno));
else
printf("%s..ok\n", *v);
close(fd);
}
}
return 0;
}

The typical output is:

/etc/passwd..ok
/net/sun-host/file1..ok
/net/aix-host/file1..ok
/net/linux-2_4_2-host/file1[0]: No locks available

The "[0]" is lck.l_pid from the example above.

HP's manpage have 3! explanations:

[ENOLCK] cmd is F_SETLK or F_SETLKW, the type of lock is a
read or write lock, and no more file-locking
headers are available (too many files have
segments locked), or no more record locks are
available (too many file segments locked).

[ENOLCK] cmd is F_SETLK or F_SETLKW, the type of lock
(l_type) is a read lock (F_RDLCK) or write lock
(F_WRLCK) and the file is an NFS file with access
bits set for enforcement mode.

[ENOLCK] cmd is F_GETLK, F_SETLK, or F_SETLKW, the file is
an NFS file, and a system error occurred on the
remote node.


My apologies if someone find the question inappropiate with the topic.
And thanks in advance for any help.


-alex
-
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