Re: NFS regression in v3.5-rc1: mount.nfs yells about incorrect mount option

[Joerg Roedel <joro@8bytes.org>]

On Thu, Jun 07, 2012 at 11:54:24AM -0400, Bryan Schumaker wrote:
> On 06/07/2012 11:50 AM, Joerg Roedel wrote:
> > mount -o nfsvers=3 ...
> 
> What about `mount -o vers=4 ...`?  I'm compiling a kernel right now to
> see if I can reproduce this, what NFS .config options do you have set?
> (`cat .config | grep CONFIG_NFS_` should be good enough).

Okay, I tracked it down somewhat. The problem is that the nfs-version
is not set in my case so that data->version in nfs_init_server is 0. The
function returns -EPROTONOSUPPORT in this case which causes the mount
to fail. The evil commit is db8333519 and reverting it fixes the issue
for me. Patch attached.

Regards,

	Joerg

From: Joerg Roedel <joerg.roedel@amd.com>
Date: Fri, 8 Jun 2012 14:51:01 +0200
Subject: [PATCH] Revert "NFS: Let mount data parsing set the NFS version"

This reverts commit db8333519187d5974cf2ff33910c893bf8727d9f.

The original commit message says, that the version field is
"unconditionally set while parsing mount data".
Unfortunatly this is not the case and the version field may
stay 0 so that nfs_init_server returns -EPROTONOSUPPORT
causing the mount to fail.  Reverting this commit fixes the
issue.

Conflicts:

	fs/nfs/super.c

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 fs/nfs/super.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index ff656c0..2fd4ce5 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -948,7 +948,7 @@ static void nfs_umount_begin(struct super_block *sb)
 		rpc_killall_tasks(rpc);
 }
 
-static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
+static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
 {
 	struct nfs_parsed_mount_data *data;
 
@@ -963,6 +963,7 @@ static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
 		data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
 		data->auth_flavors[0]	= RPC_AUTH_UNIX;
 		data->auth_flavor_len	= 1;
+		data->version		= version;
 		data->minorversion	= 0;
 		data->need_mount	= true;
 		data->net		= current->nsproxy->net_ns;
@@ -2479,7 +2480,7 @@ static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
 	struct dentry *mntroot = ERR_PTR(-ENOMEM);
 	int error;
 
-	mount_info.parsed = nfs_alloc_parsed_mount_data();
+	mount_info.parsed = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
 	mount_info.mntfh = nfs_alloc_fhandle();
 	if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
 		goto out;
-- 
1.7.9.5