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nfs4: minor callback code simplification, comment

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Note the position in the version array doesn't have to match the actual
rpc version number--to me it seems clearer to maintain the distinction.

Also document choice of rpc callback version number, as discussed in
e.g. http://www.ietf.org/mail-archive/web/nfsv4/current/msg07985.html
and followups.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
J. Bruce Fields 2010-05-14 17:57:35 -04:00
parent 15ddb4aec5
commit b7299f4439
1 changed files with 8 additions and 2 deletions
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10
fs/nfsd/nfs4callback.c
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@ -424,13 +424,19 @@ static struct rpc_procinfo nfs4_cb_procedures[] = {
};
static struct rpc_version nfs_cb_version4 = {
/*
* Note on the callback rpc program version number: despite language in rfc
* 5661 section 18.36.3 requiring servers to use 4 in this field, the
* official xdr descriptions for both 4.0 and 4.1 specify version 1, and
* in practice that appears to be what implementations use. The section
* 18.36.3 language is expected to be fixed in an erratum.
*/
.number = 1,
.nrprocs = ARRAY_SIZE(nfs4_cb_procedures),
.procs = nfs4_cb_procedures
};
static struct rpc_version * nfs_cb_version[] = {
NULL,
&nfs_cb_version4,
};
@ -471,7 +477,7 @@ int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *cb)
.timeout = &timeparms,
.program = &cb_program,
.prognumber = cb->cb_prog,
.version = nfs_cb_version[1]->number,
.version = 0,
.authflavor = clp->cl_flavor,
.flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET),
.client_name = clp->cl_principal,