Under a stable Gentoo Linux I'm not able to mount an NFSv4 exported dir. With NFSv3 however I didn't have a problem:
n22 ~ # mount -t nfs n22:/tmp /mnt/nfs/uml_tmp/
n22 ~ # umount -t nfs n22:/tmp /mnt/nfs/uml_tmp/
n22 ~ # mount -t nfs4 n22:/tmp /mnt/nfs/uml_tmp/
mount.nfs4: mount point /mnt/nfs/uml_tmp does not exist
An strace gives :
...
lstat64("/etc/mtab", {st_mode=S_IFREG|0644, st_size=402, ...}) = 0
getcwd("/root", 4095) = 6
readlink("/root/n22:", 0xbfb9836b, 4096) = -1 ENOENT (No such file or directory)
stat64("/sbin/mount.nfs4", {st_mode=S_IFREG|S_ISUID|0511, st_size=47352, ...}) = 0
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0xb7e79748) = 26527
wait4(-1, mount.nfs4: mount point /mnt/nfs/uml_tmp does not exist
[{WIFEXITED(s) && WEXITSTATUS(s) == 32}], 0, NULL) = 26527
--- SIGCHLD (Child exited) @ 0 (0) ---
exit_group(32) = ?
I'm really wondering about the line starting with : >>> readlink("/root/n22:"
b/c n22 is my machine name and I didn't see any reason why the mount command wants access that non-existant directory.
Here's my machine data:
n22 ~ # uname -a
Linux n22 2.6.23-gentoo-r9 #1 Wed Feb 27 10:25:06 CET 2008 i686 Intel(R) Pentium(R) M processor 1700MHz GenuineIntel GNU/Linux
n22 ~ # equery l nfs
[ Searching for package 'nfs' in all categories among: ]
* installed packages
[I--] [ ] net-fs/nfs-utils-1.1.0-r1 (0)
[I--] [ ] net-libs/libnfsidmap-0.19 (0)
n22 ~ # cd /proc/fs/nfs
n22 /proc/fs/nfs # tail -v *
==> exports <==
# Version 1.1
# Path Client(Flags) # IPs
/tmp n22*(rw,root_squash,all_squash,sync,wdelay,no_subtree_check,fsid=0,uuid=b5eb53c1:a8f44d71:bf7bc81c:aa83ea88)
==> filehandle <==
tail: error reading `filehandle': Invalid argument
==> max_block_size <==
131072
==> nfsv4leasetime <==
90
==> nfsv4recoverydir <==
tail: error reading `nfsv4recoverydir': Invalid argument
==> pool_threads <==
8
==> portlist <==
ipv4 tcp 0.0.0.0 2049
ipv4 udp 0.0.0.0 2049
==> threads <==
8
==> versions <==
+2 +3 +4
--
MfG/Sincerely
Toralf F?rster
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At Thursday 28 February 2008 Trond Myklebust wrote :
>
> That's because you need to mount '/' instead of '/tmp'.
Argh - my fault, NFSv4 differs much more from NFSv3 than expected.
And why does the mount command checks for the existance of the directory
/root/<hostname> ?
--
MfG/Sincerely
Toralf Förster
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