ocfs2: Fix endian bug in o2dlm protocol negotiation. (0f71b7b4) · Commits · e / devices / android_kernel_oneplus_sm8150

fs/ocfs2/dlm/dlmcommon.h

+11 −9

Original line number	Diff line number	Diff line
		@@ -602,9 +602,7 @@ enum dlm_query_join_response_code {
		JOIN_PROTOCOL_MISMATCH,
		};

		union dlm_query_join_response {
		u32 intval;
		struct {
		struct dlm_query_join_packet {
		u8 code; /* Response code. dlm_minor and fs_minor
		are only valid if this is JOIN_OK */
		u8 dlm_minor; /* The minor version of the protocol the
		@@ -612,7 +610,11 @@ union dlm_query_join_response {
		u8 fs_minor; /* The minor version of the protocol the
		filesystem is speaking. */
		u8 reserved;
		} packet;
		};

		union dlm_query_join_response {
		u32 intval;
		struct dlm_query_join_packet packet;
		};

		struct dlm_lock_request

fs/ocfs2/dlm/dlmdomain.c

+65 −36

Original line number	Diff line number	Diff line
		@@ -713,14 +713,46 @@ static int dlm_query_join_proto_check(char *proto_type, int node,
		return rc;
		}

		/*
		* struct dlm_query_join_packet is made up of four one-byte fields. They
		* are effectively in big-endian order already. However, little-endian
		* machines swap them before putting the packet on the wire (because
		* query_join's response is a status, and that status is treated as a u32
		* on the wire). Thus, a big-endian and little-endian machines will treat
		* this structure differently.
		*
		* The solution is to have little-endian machines swap the structure when
		* converting from the structure to the u32 representation. This will
		* result in the structure having the correct format on the wire no matter
		* the host endian format.
		*/
		static void dlm_query_join_packet_to_wire(struct dlm_query_join_packet *packet,
		u32 *wire)
		{
		union dlm_query_join_response response;

		response.packet = *packet;
		*wire = cpu_to_be32(response.intval);
		}

		static void dlm_query_join_wire_to_packet(u32 wire,
		struct dlm_query_join_packet *packet)
		{
		union dlm_query_join_response response;

		response.intval = cpu_to_be32(wire);
		*packet = response.packet;
		}

		static int dlm_query_join_handler(struct o2net_msg msg, u32 len, void data,
		void **ret_data)
		{
		struct dlm_query_join_request *query;
		union dlm_query_join_response response = {
		.packet.code = JOIN_DISALLOW,
		struct dlm_query_join_packet packet = {
		.code = JOIN_DISALLOW,
		};
		struct dlm_ctxt *dlm = NULL;
		u32 response;
		u8 nodenum;

		query = (struct dlm_query_join_request *) msg->buf;
		@@ -737,11 +769,11 @@ static int dlm_query_join_handler(struct o2net_msg msg, u32 len, void data,
		mlog(0, "node %u is not in our live map yet\n",
		query->node_idx);

		response.packet.code = JOIN_DISALLOW;
		packet.code = JOIN_DISALLOW;
		goto respond;
		}

		response.packet.code = JOIN_OK_NO_MAP;
		packet.code = JOIN_OK_NO_MAP;

		spin_lock(&dlm_domain_lock);
		dlm = __dlm_lookup_domain_full(query->domain, query->name_len);
		@@ -760,7 +792,7 @@ static int dlm_query_join_handler(struct o2net_msg msg, u32 len, void data,
		mlog(0, "disallow join as node %u does not "
		"have node %u in its nodemap\n",
		query->node_idx, nodenum);
		response.packet.code = JOIN_DISALLOW;
		packet.code = JOIN_DISALLOW;
		goto unlock_respond;
		}
		}
		@@ -780,23 +812,23 @@ static int dlm_query_join_handler(struct o2net_msg msg, u32 len, void data,
		/*If this is a brand new context and we
		* haven't started our join process yet, then
		* the other node won the race. */
		response.packet.code = JOIN_OK_NO_MAP;
		packet.code = JOIN_OK_NO_MAP;
		} else if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) {
		/* Disallow parallel joins. */
		response.packet.code = JOIN_DISALLOW;
		packet.code = JOIN_DISALLOW;
		} else if (dlm->reco.state & DLM_RECO_STATE_ACTIVE) {
		mlog(0, "node %u trying to join, but recovery "
		"is ongoing.\n", bit);
		response.packet.code = JOIN_DISALLOW;
		packet.code = JOIN_DISALLOW;
		} else if (test_bit(bit, dlm->recovery_map)) {
		mlog(0, "node %u trying to join, but it "
		"still needs recovery.\n", bit);
		response.packet.code = JOIN_DISALLOW;
		packet.code = JOIN_DISALLOW;
		} else if (test_bit(bit, dlm->domain_map)) {
		mlog(0, "node %u trying to join, but it "
		"is still in the domain! needs recovery?\n",
		bit);
		response.packet.code = JOIN_DISALLOW;
		packet.code = JOIN_DISALLOW;
		} else {
		/* Alright we're fully a part of this domain
		* so we keep some state as to who's joining
		@@ -807,19 +839,15 @@ static int dlm_query_join_handler(struct o2net_msg msg, u32 len, void data,
		if (dlm_query_join_proto_check("DLM", bit,
		&dlm->dlm_locking_proto,
		&query->dlm_proto)) {
		response.packet.code =
		JOIN_PROTOCOL_MISMATCH;
		packet.code = JOIN_PROTOCOL_MISMATCH;
		} else if (dlm_query_join_proto_check("fs", bit,
		&dlm->fs_locking_proto,
		&query->fs_proto)) {
		response.packet.code =
		JOIN_PROTOCOL_MISMATCH;
		packet.code = JOIN_PROTOCOL_MISMATCH;
		} else {
		response.packet.dlm_minor =
		query->dlm_proto.pv_minor;
		response.packet.fs_minor =
		query->fs_proto.pv_minor;
		response.packet.code = JOIN_OK;
		packet.dlm_minor = query->dlm_proto.pv_minor;
		packet.fs_minor = query->fs_proto.pv_minor;
		packet.code = JOIN_OK;
		__dlm_set_joining_node(dlm, query->node_idx);
		}
		}
		@@ -830,9 +858,10 @@ static int dlm_query_join_handler(struct o2net_msg msg, u32 len, void data,
		spin_unlock(&dlm_domain_lock);

		respond:
		mlog(0, "We respond with %u\n", response.packet.code);
		mlog(0, "We respond with %u\n", packet.code);

		return response.intval;
		dlm_query_join_packet_to_wire(&packet, &response);
		return response;
		}

		static int dlm_assert_joined_handler(struct o2net_msg msg, u32 len, void data,
		@@ -968,7 +997,8 @@ static int dlm_request_join(struct dlm_ctxt *dlm,
		{
		int status;
		struct dlm_query_join_request join_msg;
		union dlm_query_join_response join_resp;
		struct dlm_query_join_packet packet;
		u32 join_resp;

		mlog(0, "querying node %d\n", node);

		@@ -984,11 +1014,12 @@ static int dlm_request_join(struct dlm_ctxt *dlm,

		status = o2net_send_message(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY, &join_msg,
		sizeof(join_msg), node,
		&join_resp.intval);
		&join_resp);
		if (status < 0 && status != -ENOPROTOOPT) {
		mlog_errno(status);
		goto bail;
		}
		dlm_query_join_wire_to_packet(join_resp, &packet);

		/* -ENOPROTOOPT from the net code means the other side isn't
		listening for our message type -- that's fine, it means
		@@ -997,10 +1028,10 @@ static int dlm_request_join(struct dlm_ctxt *dlm,
		if (status == -ENOPROTOOPT) {
		status = 0;
		*response = JOIN_OK_NO_MAP;
		} else if (join_resp.packet.code == JOIN_DISALLOW \|\|
		join_resp.packet.code == JOIN_OK_NO_MAP) {
		*response = join_resp.packet.code;
		} else if (join_resp.packet.code == JOIN_PROTOCOL_MISMATCH) {
		} else if (packet.code == JOIN_DISALLOW \|\|
		packet.code == JOIN_OK_NO_MAP) {
		*response = packet.code;
		} else if (packet.code == JOIN_PROTOCOL_MISMATCH) {
		mlog(ML_NOTICE,
		"This node requested DLM locking protocol %u.%u and "
		"filesystem locking protocol %u.%u. At least one of "
		@@ -1012,14 +1043,12 @@ static int dlm_request_join(struct dlm_ctxt *dlm,
		dlm->fs_locking_proto.pv_minor,
		node);
		status = -EPROTO;
		*response = join_resp.packet.code;
		} else if (join_resp.packet.code == JOIN_OK) {
		*response = join_resp.packet.code;
		*response = packet.code;
		} else if (packet.code == JOIN_OK) {
		*response = packet.code;
		/* Use the same locking protocol as the remote node */
		dlm->dlm_locking_proto.pv_minor =
		join_resp.packet.dlm_minor;
		dlm->fs_locking_proto.pv_minor =
		join_resp.packet.fs_minor;
		dlm->dlm_locking_proto.pv_minor = packet.dlm_minor;
		dlm->fs_locking_proto.pv_minor = packet.fs_minor;
		mlog(0,
		"Node %d responds JOIN_OK with DLM locking protocol "
		"%u.%u and fs locking protocol %u.%u\n",
		@@ -1031,7 +1060,7 @@ static int dlm_request_join(struct dlm_ctxt *dlm,
		} else {
		status = -EINVAL;
		mlog(ML_ERROR, "invalid response %d from node %u\n",
		join_resp.packet.code, node);
		packet.code, node);
		}

		mlog(0, "status %d, node %d response is %d\n", status, node,