/proc/fs/nfsd/versions was extended to allow turning on/off minor
versions by echoing "+4.1" or "-4.1" to /proc/fs/nsfd/versions.
Unfortunately, pre-2.6.30 kernels just stop parsing at first non-digit,
so "-4.1" is interpreted as "-4". If new nfs-utils (on old kernel)
writes "+2", "+3", "+4", then "-4.1", result therefore is to turn off
4.1.
Given that historical behavior, it may have been a mistake to extend the
interface the way we did; but at this point we're probably stuck with
it. So, just reverse the order we write versions in.
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Steve Dickson <steved@redhat.com>
+ n = minorvers4 >= 0 ? minorvers4 : -minorvers4;
+ if (n >= NFSD_MINMINORVERS4 && n <= NFSD_MAXMINORVERS4)
+ off += snprintf(ptr+off, sizeof(buf) - off, "%c4.%d ",
+ minorvers4 > 0 ? '+' : '-',
+ n);
for (n = NFSD_MINVERS; n <= NFSD_MAXVERS; n++) {
if (NFSCTL_VERISSET(ctlbits, n))
off += snprintf(ptr+off, sizeof(buf) - off, "+%d ", n);
else
off += snprintf(ptr+off, sizeof(buf) - off, "-%d ", n);
}
for (n = NFSD_MINVERS; n <= NFSD_MAXVERS; n++) {
if (NFSCTL_VERISSET(ctlbits, n))
off += snprintf(ptr+off, sizeof(buf) - off, "+%d ", n);
else
off += snprintf(ptr+off, sizeof(buf) - off, "-%d ", n);
}
- n = minorvers4 >= 0 ? minorvers4 : -minorvers4;
- if (n >= NFSD_MINMINORVERS4 && n <= NFSD_MAXMINORVERS4)
- off += snprintf(ptr+off, sizeof(buf) - off, "%c4.%d",
- minorvers4 > 0 ? '+' : '-',
- n);
xlog(D_GENERAL, "Writing version string to kernel: %s", buf);
snprintf(ptr+off, sizeof(buf) - off, "\n");
if (write(fd, buf, strlen(buf)) != strlen(buf))
xlog(D_GENERAL, "Writing version string to kernel: %s", buf);
snprintf(ptr+off, sizeof(buf) - off, "\n");
if (write(fd, buf, strlen(buf)) != strlen(buf))