* [PATCH] nfs41: make sure nfs server return right ca_maxresponsesize_cached
@ 2011-03-10 9:43 Mi Jinlong
2011-03-16 15:12 ` J. Bruce Fields
0 siblings, 1 reply; 3+ messages in thread
From: Mi Jinlong @ 2011-03-10 9:43 UTC (permalink / raw)
To: J. Bruce Fields; +Cc: NFS
According to rfc5661,
ca_maxresponsesize_cached:
Like ca_maxresponsesize, but the maximum size of a reply that
will be stored in the reply cache (Section 2.10.6.1). For each
channel, the server MAY decrease this value, but MUST NOT
increase it.
the latest kernel(2.6.38-rc8) may increase the value for ignoring
request's ca_maxresponsesize_cached value. We should not ignore it.
Signed-off-by: Mi Jinlong <mijinlong@cn.fujitsu.com>
---
fs/nfsd/nfs4state.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 54b60bf..96edd02 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -608,7 +608,8 @@ static void init_forechannel_attrs(struct nfsd4_channel_attrs *new, struct nfsd4
u32 maxrpc = nfsd_serv->sv_max_mesg;
new->maxreqs = numslots;
- new->maxresp_cached = slotsize + NFSD_MIN_HDR_SEQ_SZ;
+ new->maxresp_cached = min_t(u32, req->maxresp_cached,
+ slotsize + NFSD_MIN_HDR_SEQ_SZ);
new->maxreq_sz = min_t(u32, req->maxreq_sz, maxrpc);
new->maxresp_sz = min_t(u32, req->maxresp_sz, maxrpc);
new->maxops = min_t(u32, req->maxops, NFSD_MAX_OPS_PER_COMPOUND);
--
1.7.4.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] nfs41: make sure nfs server return right ca_maxresponsesize_cached
2011-03-10 9:43 [PATCH] nfs41: make sure nfs server return right ca_maxresponsesize_cached Mi Jinlong
@ 2011-03-16 15:12 ` J. Bruce Fields
2011-03-18 3:04 ` Mi Jinlong
0 siblings, 1 reply; 3+ messages in thread
From: J. Bruce Fields @ 2011-03-16 15:12 UTC (permalink / raw)
To: Mi Jinlong; +Cc: NFS
On Thu, Mar 10, 2011 at 05:43:37PM +0800, Mi Jinlong wrote:
> According to rfc5661,
>
> ca_maxresponsesize_cached:
>
> Like ca_maxresponsesize, but the maximum size of a reply that
> will be stored in the reply cache (Section 2.10.6.1). For each
> channel, the server MAY decrease this value, but MUST NOT
> increase it.
I wonder what the reason for that is--I can't see why the client would
object to the server increasing this. Oh well, my as well observe the
MUST NOT; applied.
--b.
>
> the latest kernel(2.6.38-rc8) may increase the value for ignoring
> request's ca_maxresponsesize_cached value. We should not ignore it.
>
> Signed-off-by: Mi Jinlong <mijinlong@cn.fujitsu.com>
> ---
> fs/nfsd/nfs4state.c | 3 ++-
> 1 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
> index 54b60bf..96edd02 100644
> --- a/fs/nfsd/nfs4state.c
> +++ b/fs/nfsd/nfs4state.c
> @@ -608,7 +608,8 @@ static void init_forechannel_attrs(struct nfsd4_channel_attrs *new, struct nfsd4
> u32 maxrpc = nfsd_serv->sv_max_mesg;
>
> new->maxreqs = numslots;
> - new->maxresp_cached = slotsize + NFSD_MIN_HDR_SEQ_SZ;
> + new->maxresp_cached = min_t(u32, req->maxresp_cached,
> + slotsize + NFSD_MIN_HDR_SEQ_SZ);
> new->maxreq_sz = min_t(u32, req->maxreq_sz, maxrpc);
> new->maxresp_sz = min_t(u32, req->maxresp_sz, maxrpc);
> new->maxops = min_t(u32, req->maxops, NFSD_MAX_OPS_PER_COMPOUND);
> --
> 1.7.4.1
>
>
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] nfs41: make sure nfs server return right ca_maxresponsesize_cached
2011-03-16 15:12 ` J. Bruce Fields
@ 2011-03-18 3:04 ` Mi Jinlong
0 siblings, 0 replies; 3+ messages in thread
From: Mi Jinlong @ 2011-03-18 3:04 UTC (permalink / raw)
To: J. Bruce Fields; +Cc: NFS
J. Bruce Fields:
> On Thu, Mar 10, 2011 at 05:43:37PM +0800, Mi Jinlong wrote:
>> According to rfc5661,
>>
>> ca_maxresponsesize_cached:
>>
>> Like ca_maxresponsesize, but the maximum size of a reply that
>> will be stored in the reply cache (Section 2.10.6.1). For each
>> channel, the server MAY decrease this value, but MUST NOT
>> increase it.
>
> I wonder what the reason for that is--I can't see why the client would
> object to the server increasing this. Oh well, my as well observe the
> MUST NOT; applied.
I just read the RFC and got it.
Agree with you.
--
thanks,
Mi Jinlong
>
> --b.
>
>>
>> the latest kernel(2.6.38-rc8) may increase the value for ignoring
>> request's ca_maxresponsesize_cached value. We should not ignore it.
>>
>> Signed-off-by: Mi Jinlong <mijinlong@cn.fujitsu.com>
>> ---
>> fs/nfsd/nfs4state.c | 3 ++-
>> 1 files changed, 2 insertions(+), 1 deletions(-)
>>
>> diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
>> index 54b60bf..96edd02 100644
>> --- a/fs/nfsd/nfs4state.c
>> +++ b/fs/nfsd/nfs4state.c
>> @@ -608,7 +608,8 @@ static void init_forechannel_attrs(struct nfsd4_channel_attrs *new, struct nfsd4
>> u32 maxrpc = nfsd_serv->sv_max_mesg;
>>
>> new->maxreqs = numslots;
>> - new->maxresp_cached = slotsize + NFSD_MIN_HDR_SEQ_SZ;
>> + new->maxresp_cached = min_t(u32, req->maxresp_cached,
>> + slotsize + NFSD_MIN_HDR_SEQ_SZ);
>> new->maxreq_sz = min_t(u32, req->maxreq_sz, maxrpc);
>> new->maxresp_sz = min_t(u32, req->maxresp_sz, maxrpc);
>> new->maxops = min_t(u32, req->maxops, NFSD_MAX_OPS_PER_COMPOUND);
>> --
>> 1.7.4.1
>>
>>
>>
^ permalink raw reply [flat|nested] 3+ messages in thread
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