Re: [NFS] "mount: File exists" when trying to mount a second krb5 volume!
Open Source <opensource3141 <at> yahoo.com>
2006-11-21 15:16:17 GMT
Hi Trond (and Bruce),
Not sure if you saw my email from yesterday (as well as
Kostas' email previous to mine).
Actually it turns out that the problem I am seeing is much more
severe than I had first thought. I switched to NFSv4+krb5 and
I saw the same issue there. Without your patch, the behavior
is basically the same as in NFSv3+krb5. Namely, you cannot
have a pseudofilesystem with more than 1 directory export.
If you do, you can mount the pseudofilesystem on the client
but when you run "ls" on the mount point you get a "file exists"
error. A quick look at the rpc_pipe_fs directory shows
that only one clnt directory exists! Basically we have the
same problem as before.
Your patch does fix the problem but when unmounting the
filesystem (NFSv3) or pseudofilesystem (NFSv4), the kernel
crashes.
It appears that this is a very urgent problem since it prevents
many people from using krb5 at all. Is it possible for you to provide
a more stable fix soon? Kernel 2.6.19 is already in rc6. We really
need to get this thing fixed and back into the upstream sources ASAP!
Thanks in advance for your help.
Best regards,
Paarvai
----- Original Message ----
From: Open Source <opensource3141 <at> yahoo.com>
To: Trond Myklebust <trond.myklebust <at> fys.uio.no>
Cc: nfsv4 <at> linux-nfs.org; nfs <at> lists.sourceforge.net; Kostas Georgiou <k.georgiou <at> imperial.ac.uk>
Sent: Monday, November 20, 2006 11:47:00 AM
Subject: Re: [NFS] "mount: File exists" when trying to mount a second krb5 volume!
Hi Trond,
I can confirm that I also see a crash with your patch file in place!
I'm not sure if that's because it didn't apply cleanly to begin with
and my massaging might have caused a problem. I don't think
so though.
Basically if you mount a couple NFSv3+krb5 partitions and
then unmount one of them, the system locks up after about 2
seconds. I didn't see this before since I didn't use the
automounter utility.
Thanks,
Paarvai
----- Original Message ----
From: Kostas Georgiou <k.georgiou <at> imperial.ac.uk>
To: Open Source <opensource3141 <at> yahoo.com>
Cc: Trond Myklebust <trond.myklebust <at> fys.uio.no>; nfs <at> lists.sourceforge.net; nfsv4 <at> linux-nfs.org
Sent: Saturday, November 18, 2006 7:15:04 AM
Subject: Re: [NFS] "mount: File exists" when trying to mount a second krb5 volume!
On Fri, Nov 17, 2006 at 11:59:25AM -0800, Open Source wrote:
> Thanks Trond. Saving the patch did the trick. I had
> to do some manual hacking to get the patch to
> apply because you must have done your diff
> against a different kernel tree revision. I'm using
> 2.6.18 from FC5 updates.
>
> Once I massaged things, the patch compiled and it
> works. I am able to mount more than one partition
> with no problems now. However, I cannot speak
> to the finer points (like memory leaks, etc.) since
> I don't know the code so well. I trust someone else
> will independently verify it (i.e., code review) before
> it gets into the kernel tree.
I did the same with the FC6 2.6.18 kernel and while it does allow
me to have more than one mount from the server autofs decides that
my home is not in use any more and it unmounts it, somehow this
causes the system to freeze as well.
Nov 17 16:28:14 thufir automount[2483]: mount still busy /home
Nov 17 16:29:29 thufir automount[2483]: expiring path /home/georgiou
Nov 17 16:29:29 thufir automount[2483]: unmounting dir = /home/georgiou
Nov 17 16:29:32 thufir automount[2483]: expired /home/georgiou
Here is the patch with my changes to apply in FC6 which most likely is
bad since I really don't know the code at all :(
Kostas Georgiou
diff -u a/include/linux/sunrpc/clnt.h b/include/linux/sunrpc/clnt.h
--- a/include/linux/sunrpc/clnt.h
+++ b/include/linux/sunrpc/clnt.h
<at> <at> -64,6 +64,7 <at> <at>
struct dentry * cl_dentry; /* inode */
struct rpc_clnt * cl_parent; /* Points to parent of clones */
struct rpc_rtt cl_rtt_default;
+ struct rpc_program * cl_program;
struct rpc_portmap cl_pmap_default;
char cl_inline_name[32];
};
diff -u a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
<at> <at> -154,6 +154,7 <at> <at>
clnt->cl_prot = xprt->prot;
clnt->cl_stats = program->stats;
clnt->cl_metrics = rpc_alloc_iostats(clnt);
+ clnt->cl_program = program;
rpc_init_wait_queue(&clnt->cl_pmap_default.pm_bindwait, "bindwait");
if (!clnt->cl_port)
<at> <at> -235,6 +236,7 <at> <at>
rpc_clone_client(struct rpc_clnt *clnt)
{
struct rpc_clnt *new;
+ int err;
new = kmalloc(sizeof(*new), GFP_KERNEL);
if (!new)
<at> <at> -242,6 +244,11 <at> <at>
memcpy(new, clnt, sizeof(*new));
atomic_set(&new->cl_count, 1);
atomic_set(&new->cl_users, 0);
+ err = rpc_setup_pipedir(new, clnt->cl_program->pipe_dir_name);
+ if (err != 0) {
+ kfree(new);
+ return ERR_PTR(err);
+ }
new->cl_parent = clnt;
atomic_inc(&clnt->cl_count);
/* Duplicate portmapper */
<at> <at> -250,8 +257,6 <at> <at>
new->cl_autobind = 0;
new->cl_oneshot = 0;
new->cl_dead = 0;
- if (!IS_ERR(new->cl_dentry))
- dget(new->cl_dentry);
rpc_init_rtt(&new->cl_rtt_default, clnt->cl_xprt->timeout.to_initval);
if (new->cl_auth)
atomic_inc(&new->cl_auth->au_count);
<at> <at> -313,12 +318,6 <at> <at>
rpcauth_destroy(clnt->cl_auth);
clnt->cl_auth = NULL;
}
- if (clnt->cl_parent != clnt) {
- if (!IS_ERR(clnt->cl_dentry))
- dput(clnt->cl_dentry);
- rpc_destroy_client(clnt->cl_parent);
- goto out_free;
- }
if (!IS_ERR(clnt->cl_dentry)) {
rpc_rmdir(clnt->cl_dentry);
rpc_put_mount();
<at> <at> -327,6 +326,10 <at> <at>
xprt_destroy(clnt->cl_xprt);
clnt->cl_xprt = NULL;
}
+ if (clnt->cl_parent != clnt) {
+ rpc_destroy_client(clnt->cl_parent);
+ goto out_free;
+ }
if (clnt->cl_server != clnt->cl_inline_name)
kfree(clnt->cl_server);
out_free:
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