OPEN_CREATE with EXCLUSIVE4_1 sends initial file permission.
Ignoring fact, that server have indicated that file mod is set, client
will send yet another SETATTR request, but, as mode is already set,
new SETATTR will be empty. This is not a problem, nevertheless
an extra roundtrip and slow open on high latency networks.
This change is aims to by-pass setattr if there are no attributes defined.
Signed-off-by: Tigran Mkrtchyan <[email protected]>
---
fs/nfs/nfs4proc.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 327b8c3..f6b278f 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2724,6 +2724,12 @@ static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
.inode = inode,
};
int err;
+ /*
+ * a shortcut: it there are no attributes to be updated, do not send setattr at all
+ */
+ if (sattr->ia_valid == ATTR_OPEN)
+ return 0;
+
do {
err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
switch (err) {
--
2.5.5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==
----- Original Message -----
> From: "Trond Myklebust" <[email protected]>
> To: "Tigran Mkrtchyan" <[email protected]>
> Cc: [email protected]
> Sent: Thursday, May 12, 2016 12:25:18 AM
> Subject: Re: [PATCH] nfs4: client: do not send empty SETATTR after OPEN_CREATE
> On 5/11/16, 18:14, "Tigran Mkrtchyan" <[email protected]> wrote:
>
>>OPEN_CREATE with EXCLUSIVE4_1 sends initial file permission.
>>Ignoring fact, that server have indicated that file mod is set, client
>>will send yet another SETATTR request, but, as mode is already set,
>>new SETATTR will be empty. This is not a problem, nevertheless
>>an extra roundtrip and slow open on high latency networks.
>>
>>This change is aims to by-pass setattr if there are no attributes defined.
>>
>>Signed-off-by: Tigran Mkrtchyan <[email protected]>
>>---
>> fs/nfs/nfs4proc.c | 6 ++++++
>> 1 file changed, 6 insertions(+)
>>
>>diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
>>index 327b8c3..f6b278f 100644
>>--- a/fs/nfs/nfs4proc.c
>>+++ b/fs/nfs/nfs4proc.c
>>@@ -2724,6 +2724,12 @@ static int nfs4_do_setattr(struct inode *inode, struct
>>rpc_cred *cred,
>> .inode = inode,
>> };
>> int err;
>>+ /*
>>+ * a shortcut: it there are no attributes to be updated, do not send setattr
>>at all
>>+ */
>>+ if (sattr->ia_valid == ATTR_OPEN)
>>+ return 0;
>>+
>
> There is already a similar optimization in nfs_setattr(), so I don’t think it
Obviously not mature enough.
> makes sense to put this in nfs4_do_setattr(). We should rather just fix
> _nfs4_do_open().
Agree. See v2.
Tigran.
>
>> do {
>> err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
>> switch (err) {
>>--
>>2.5.5
>>
>
> N�����r��y���b�X��ǧv�^�){.n�+����{���"��^n�r���z���h����&���G���h�(�階�ݢj"���m�����z�ޖ���f���h���~�m�