Re: [pnfs] [PATCH 1/2] nfsd41: fix NFSD_MIN_HDR_SEQ_SZ

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On Mon, Sep 14, 2009 at 2:51 PM, J. Bruce Fields <bfields@xxxxxxxxxxxx> wrote:
> On Fri, Sep 11, 2009 at 06:52:54PM -0400, andros@xxxxxxxxxx wrote:
>> From: Andy Adamson <andros@xxxxxxxxxx>
>>
>> The reply RPC header is 12 bytes, the NULL verifier is 8 bytes giving 20
>> not 24 bytes in the NFSD_MIN_HDR_SEQ_SZ calculation,
>
> No, 24 is right.  Maybe you forgot the accept stat at the end?:

yes - missed the accept state.

-->Andy
>
>        xid
>        msg type
>        reply stat
>        verf flavor
>        verf length
>        accept stat
>
> --b.
>
>>
>> Signed-off-by: Andy Adamson <andros@xxxxxxxxxx>
>> ---
>>  fs/nfsd/nfs4state.c |    4 ++--
>>  1 files changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
>> index 46e9ac5..5ecb42c 100644
>> --- a/fs/nfsd/nfs4state.c
>> +++ b/fs/nfsd/nfs4state.c
>> @@ -420,12 +420,12 @@ gen_sessionid(struct nfsd4_session *ses)
>>   * each time.  Therefore we can advertise a ca_maxresponssize_cached
>>   * value that is the number of bytes in our cache plus a few additional
>>   * bytes.  In order to stay on the safe side, and not promise more than
>> - * we can cache, those additional bytes must be the minimum possible: 24
>> + * we can cache, those additional bytes must be the minimum possible: 20
>>   * bytes of rpc header (xid through accept state, with AUTH_NULL
>>   * verifier), 12 for the compound header (with zero-length tag), and 44
>>   * for the SEQUENCE op response:
>>   */
>> -#define NFSD_MIN_HDR_SEQ_SZ  (24 + 12 + 44)
>> +#define NFSD_MIN_HDR_SEQ_SZ  (20 + 12 + 44)
>>
>>  /*
>>   * Give the client the number of ca_maxresponsesize_cached slots it
>> --
>> 1.6.2.5
>>
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