On 03/10/17 14:55, Donald Buczek wrote:
I see this code
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#define FILENAME "test.dat"
int main() {
int i;
int fd;
unlink(FILENAME);
for (i=0;i<1000;i++) {
printf("%d\n",i);
if ((fd=open(FILENAME,O_WRONLY+O_CREAT,0))==-1) {
perror("open");
exit(1);
}
if (close(fd)==-1) {
perror("close");
exit(1);
}
if (unlink(FILENAME)==-1) {
perror("unlink");
exit(1);
}
}
}
failing most of the time in NFS-mounted directories:
buczek@theinternet:~$ uname -a
Linux theinternet.molgen.mpg.de 4.4.52.mx64.142 #1 SMP Fri Mar 3
21:25:00 CET 2017 x86_64 GNU/Linux
buczek@theinternet:~$ nfs_test
0
1
2
3
4
open: Permission denied
buczek@theinternet:~$
but I fail to find an answer to the question, whether this is supposed
to work or not. Is this a bug or a caching feature?
Thanks
Donald
With some bisect work I discovered, that this was just a different
manifestation of Bug 109771 [1] reported by myself and fixed by Trond
[2] for Linux v4.5. Many of my clients are back on Linux v4.4 longterm
because of unrelated issues with other releases and I wrongly thought,
the fix was backported.
Donald
[1] https://bugzilla.kernel.org/show_bug.cgi?id=109771
[2]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=762674f
--
Donald Buczek
buczek@xxxxxxxxxxxxx
Tel: +49 30 8413 1433
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