Enforce the rules about compound op ordering.
Motivated by implementing RECLAIM_COMPLETE, for which the client is
implicit in the current session, so it is important to ensure a
succesful SEQUENCE proceeds the RECLAIM_COMPLETE.
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxxxxxx>
---
fs/nfsd/nfs4proc.c | 44 ++++++++++++++++++++++++++++++--------------
fs/nfsd/nfs4state.c | 13 +++++++++++++
2 files changed, 43 insertions(+), 14 deletions(-)
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 37514c4..e147dbc 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -968,20 +968,36 @@ static struct nfsd4_operation nfsd4_ops[];
static const char *nfsd4_op_name(unsigned opnum);
/*
- * Enforce NFSv4.1 COMPOUND ordering rules.
+ * Enforce NFSv4.1 COMPOUND ordering rules:
*
- * TODO:
- * - enforce NFS4ERR_NOT_ONLY_OP,
- * - DESTROY_SESSION MUST be the final operation in the COMPOUND request.
+ * Also note, enforced elsewhere:
+ * - SEQUENCE other than as first op results in
+ * NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
+ * - BIND_CONN_TO_SESSION must be the only op in its compound
+ * (Will be enforced in nfsd4_bind_conn_to_session().)
+ * - DESTROY_SESSION must be the final operation in a compound, if
+ * sessionid's in SEQUENCE and DESTROY_SESSION are the same.
+ * (Enforced in nfsd4_destroy_session().)
*/
-static bool nfs41_op_ordering_ok(struct nfsd4_compoundargs *args)
+static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
{
- if (args->minorversion && args->opcnt > 0) {
- struct nfsd4_op *op = &args->ops[0];
- return (op->status == nfserr_op_illegal) ||
- (nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP);
- }
- return true;
+ struct nfsd4_op *op = &args->ops[0];
+
+ /* These ordering requirements don't apply to NFSv4.0: */
+ if (args->minorversion == 0)
+ return nfs_ok;
+ /* This is weird, but OK, not our problem: */
+ if (args->opcnt == 0)
+ return nfs_ok;
+ if (op->status == nfserr_op_illegal)
+ return nfs_ok;
+ if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
+ return nfserr_op_not_in_session;
+ if (op->opnum == OP_SEQUENCE)
+ return nfs_ok;
+ if (args->opcnt != 1)
+ return nfserr_not_only_op;
+ return nfs_ok;
}
/*
@@ -1023,13 +1039,13 @@ nfsd4_proc_compound(struct svc_rqst *rqstp,
if (args->minorversion > nfsd_supported_minorversion)
goto out;
- if (!nfs41_op_ordering_ok(args)) {
+ status = nfs41_check_op_ordering(args);
+ if (status) {
op = &args->ops[0];
- op->status = nfserr_sequence_pos;
+ op->status = status;
goto encode_op;
}
- status = nfs_ok;
while (!status && resp->opcnt < args->opcnt) {
op = &args->ops[resp->opcnt++];
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 5051ade..e444829 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1365,6 +1365,14 @@ out:
return status;
}
+static bool nfsd4_last_compound_op(struct svc_rqst *rqstp)
+{
+ struct nfsd4_compoundres *resp = rqstp->rq_resp;
+ struct nfsd4_compoundargs *argp = rqstp->rq_argp;
+
+ return argp->opcnt == resp->opcnt;
+}
+
__be32
nfsd4_destroy_session(struct svc_rqst *r,
struct nfsd4_compound_state *cstate,
@@ -1380,6 +1388,11 @@ nfsd4_destroy_session(struct svc_rqst *r,
* - Do we need to clear any callback info from previous session?
*/
+ if (!memcmp(&sessionid->sessionid, &cstate->session->se_sessionid,
+ sizeof(struct nfs4_sessionid))) {
+ if (!nfsd4_last_compound_op(r))
+ return nfserr_not_only_op;
+ }
dump_sessionid(__func__, &sessionid->sessionid);
spin_lock(&sessionid_lock);
ses = find_in_sessionid_hashtbl(&sessionid->sessionid);
--
1.6.3.3
--
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