The parsing of the nfsmount.conf configuration file has various issues.
Here's an example config file I've been testing with:
# cat /etc/nfsmount.conf
[ NFSMount_Global_Options ]
Acl=False
Ac=False
Timeo=600
Background=True
[ Server "nfs.smayhew.test" ]
Sec=krb5p
Nfsvers=4
Acl=True
Ac=True
Timeo=300
Sloppy=True
Foreground=True
[ Server "rhel7alpha2.smayhew.test" ]
Sec=krb5i
Nfsvers=4
[ Server "rhel6u2.smayhew.test" ]
Nfsvers=4
[ Server "rhel5u8.smayhew.test" ]
Nfsvers=3
[ Server "rhel4u8.smayhew.test" ]
Nfsvers=3
[ MountPoint "/mnt/nfs" ]
Timeo=150
Background=False
Ac=False
Sloppy=False
I then mount a filesystem using:
# mount nfs.smayhew.test:/export /mnt/nfs
# mount | grep smayhew
nfs.smayhew.test:/export on /mnt/nfs type nfs
(rw,timeo=600,bg,sec=krb5p,nfsvers=4,acl,ac,timeo=300,sloppy,fg,sec=krb5p,nfsvers=4,nfsvers=4,nfsvers=4,nfsvers=4,addr=192.168.122.179,clientaddr=192.168.122.202)
# grep smayhew /proc/mounts
nfs.smayhew.test:/export/ /mnt/nfs nfs4
rw,relatime,vers=4,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,port=0,timeo=300,retrans=2,sec=krb5p,clientaddr=192.168.122.202,minorversion=0,local_lock=none,addr=192.168.122.179
0 0
In the output of mount (no arguments) as well as /etc/mtab,
1. nfsvers=4 is shown four times
2. sec=krb5p is shown twice
3. both fg and bg is shown
4. timeo appears twice
In /proc/mounts we can see that we have the wrong value for timeo (it should be
150).
In newer distros where /etc/mtab is a symlink to /proc/mounts, you're unlikely
to see most of these issues unless you're watching the mount command with
something like systemtap, e.g.
# stap -e 'probe syscall.mount { printf("%s %s\n", probefunc(),
# kernel_string($data)) }'
sys_mount
timeo=600,bg,sec=krb5p,nfsvers=4,acl,ac,timeo=300,sloppy,fg,sec=krb5p,nfsvers=4,nfsvers=4,nfsvers=4,nfsvers=4,addr=192.168.122.179,clientaddr=192.168.122.202
Regardless, rather than sending a slew of mount options and letting the kernel
sort it out, we can do a better job of parsing them on the front end.
Scott Mayhew (4):
mount.nfs: avoid unnecessary duplication of options passed to
mount(2)
mount.nfs: avoid sending conflicting mount options
mount.nfs: improve handling of MNT_NOARG type options
mount.nfs: clean up conf_parse_mntopts()
support/include/conffile.h | 2 +-
support/nfs/conffile.c | 4 ++-
utils/mount/configfile.c | 77 +++++++++++++++++++++++++++++++++++++++++-----
3 files changed, 73 insertions(+), 10 deletions(-)
--
1.7.11.7
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