From f808c94e8abb104e5248ee92acf6aeaf2e06e76a Mon Sep 17 00:00:00 2001 From: "J. Bruce Fields" Date: Thu, 4 Feb 2010 17:03:53 -0500 Subject: [PATCH] nfsd: fix version-setting regression on old kernels /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 Signed-off-by: Steve Dickson --- utils/nfsd/nfssvc.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/utils/nfsd/nfssvc.c b/utils/nfsd/nfssvc.c index b8028bb..60232b8 100644 --- a/utils/nfsd/nfssvc.c +++ b/utils/nfsd/nfssvc.c @@ -238,17 +238,17 @@ nfssvc_setvers(unsigned int ctlbits, int minorvers4) if (fd < 0) return; + 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); } - 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)) -- 2.39.2