Revert "NFS: Ensure we return zero if applications attempt to write zero bytes"

This reverts commit b9148c6b.

On Wed, 12 Dec 2007 10:57:30 -0500, Chuck Lever wrote
> commit b9148c6b should be reverted.  It was recently forward-ported
> from some years-old patches, and is clearly not needed now.
>
> On Dec 11, 2007, at 5:21 PM, Adrian Bunk wrote:
>
>> This code became dead after commit
>> b9148c6b
>> (which BTW doesn't seem to have changed any behaviour) and can
>> therefore
>> be removed.
>>
>> Spotted by the Coverity checker.
>>
>> Signed-off-by: Adrian Bunk <bunk@kernel.org>
>>
>> ---
>> --- linux-2.6/fs/nfs/direct.c.old     2007-12-02 21:54:53.000000000 +0100
>> +++ linux-2.6/fs/nfs/direct.c 2007-12-02 21:55:10.000000000 +0100
>> @@ -897,15 +897,12 @@ ssize_t nfs_file_direct_write(struct kio
>>       if (!count)
>>               goto out;       /* return 0 */
>>
>>       retval = -EINVAL;
>>       if ((ssize_t) count < 0)
>>               goto out;
>> -     retval = 0;
>> -     if (!count)
>> -             goto out;
>>
>>       retval = nfs_sync_mapping(mapping);
>>       if (retval)
>>               goto out;
>>
>>       retval = nfs_direct_write(iocb, iov, nr_segs, pos, count);
>>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/direct.c

@@ -894,8 +894,6 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, const struct iovec *iov,
 	retval = generic_write_checks(file, &pos, &count, 0);
 	if (retval)
 		goto out;
-	if (!count)
-		goto out;	/* return 0 */
 
 	retval = -EINVAL;
 	if ((ssize_t) count < 0)