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NFSv4.1: Don't set up a backchannel if the server didn't agree to do so 

If the server doesn't agree to out backchannel setup request, then
don't set one up.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2015-02-18 11:34:58 -08:00
parent 79969dd12e
commit b1c0df5fad
3 changed files with 9 additions and 2 deletions
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2
fs/nfs/callback_proc.c
View File

@ -427,6 +427,8 @@ __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
if (clp == NULL)
goto out;
if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
goto out;
tbl = &clp->cl_session->bc_slot_table;
spin_lock(&tbl->slot_tbl_lock);

7
fs/nfs/nfs4proc.c
View File

@ -7195,6 +7195,8 @@ static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args
struct nfs4_channel_attrs *sent = &args->bc_attrs;
struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
if (!(res->flags & SESSION4_BACK_CHAN))
goto out;
if (rcvd->max_rqst_sz > sent->max_rqst_sz)
return -EINVAL;
if (rcvd->max_resp_sz < sent->max_resp_sz)
@ -7206,6 +7208,7 @@ static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args
return -EINVAL;
if (rcvd->max_reqs != sent->max_reqs)
return -EINVAL;
out:
return 0;
}
@ -7226,7 +7229,9 @@ static void nfs4_update_session(struct nfs4_session *session,
nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
session->flags = res->flags;
memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
memcpy(&session->bc_attrs, &res->bc_attrs, sizeof(session->bc_attrs));
if (res->flags & SESSION4_BACK_CHAN)
memcpy(&session->bc_attrs, &res->bc_attrs,
sizeof(session->bc_attrs));
}
static int _nfs4_proc_create_session(struct nfs_client *clp,

2
fs/nfs/nfs4session.c
View File

@ -450,7 +450,7 @@ int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
tbl = &ses->fc_slot_table;
tbl->session = ses;
status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
if (status) /* -ENOMEM */
if (status || !(ses->flags & SESSION4_BACK_CHAN)) /* -ENOMEM */
return status;
/* Back channel */
tbl = &ses->bc_slot_table;