On 06/06/2012 02:31 PM, Chuck Lever wrote:
>
> On Jun 6, 2012, at 2:12 PM, Steve Dickson wrote:
>
>> Sservers that only have NFSv4.1 support the
>> NFS4ERR_MINOR_VERS_MISMATCH error is return on
>> v4.0 mounts. Mapping that error to EPROTONOSUPPORT
>> will cause the mount to back off to v3 instead of
>> failing.
>
> Should we try NFSv4.0 first?
We do try v4.0 first and that mount fails with
NFS4ERR_MINOR_VERS_MISMATCH. Today the kenrel sends up
an EIO error which causes the mount to fail. With this
patch, the kernel will send up a EPROTONOSUPPORT error
which will cause a v3 mount to be tried...
steved.
>
>>
>> Signed-off-by: Steve Dickson <steved@xxxxxxxxxx>
>> ---
>> fs/nfs/nfs4proc.c | 2 ++
>> 1 files changed, 2 insertions(+), 0 deletions(-)
>>
>> diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
>> index d48dbef..eda028b 100644
>> --- a/fs/nfs/nfs4proc.c
>> +++ b/fs/nfs/nfs4proc.c
>> @@ -105,6 +105,8 @@ static int nfs4_map_errors(int err)
>> return -EINVAL;
>> case -NFS4ERR_SHARE_DENIED:
>> return -EACCES;
>> + case -NFS4ERR_MINOR_VERS_MISMATCH:
>> + return -EPROTONOSUPPORT;
>> default:
>> dprintk("%s could not handle NFSv4 error %d\n",
>> __func__, -err);
>> --
>> 1.7.1
>>
>> --
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>
> ---
> Chuck Lever
> chuck [dot] lever [at] oracle [dot] com
>
>
>
>
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