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Commit 7a04cfda authored by J. Bruce Fields's avatar J. Bruce Fields
Browse files

nfsd: clarify check_op_ordering 



Document a couple things that confused me on a recent reading.

Reviewed-by: default avatarJeff Layton <jlayton@kernel.org>
Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 4a269efb

fs/nfsd/nfs4proc.c

+9 −4
Original line number Diff line number Diff line
@@ -1603,7 +1603,7 @@ static const char *nfsd4_op_name(unsigned opnum); 
 */

static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)

{

	struct nfsd4_op *op = &args->ops[0];

	struct nfsd4_op *first_op = &args->ops[0];



	/* These ordering requirements don't apply to NFSv4.0: */

	if (args->minorversion == 0)
@@ -1611,12 +1611,17 @@ static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args) 
	/* This is weird, but OK, not our problem: */

	if (args->opcnt == 0)

		return nfs_ok;

	if (op->status == nfserr_op_illegal)

	if (first_op->status == nfserr_op_illegal)

		return nfs_ok;

	if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))

	if (!(nfsd4_ops[first_op->opnum].op_flags & ALLOWED_AS_FIRST_OP))

		return nfserr_op_not_in_session;

	if (op->opnum == OP_SEQUENCE)

	if (first_op->opnum == OP_SEQUENCE)

		return nfs_ok;

	/*

	 * So first_op is something allowed outside a session, like

	 * EXCHANGE_ID; but then it has to be the only op in the

	 * compound:

	 */

	if (args->opcnt != 1)

		return nfserr_not_only_op;

	return nfs_ok;