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Commit 9e971b71 authored by David Teigland's avatar David Teigland Committed by Steven Whitehouse
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[DLM] add version check 



Check if we receive a message from another lockspace member running a
version of the dlm with an incompatible inter-node message protocol.

Signed-off-by: default avatarDavid Teigland <teigland@redhat.com>
Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
parent 38aa8b0c

fs/dlm/rcom.c

+11 −3
Original line number Diff line number Diff line
@@ -82,8 +82,17 @@ static void make_config(struct dlm_ls *ls, struct rcom_config *rf) 
	rf->rf_lsflags = ls->ls_exflags;

}



static int check_config(struct dlm_ls *ls, struct rcom_config *rf, int nodeid)

static int check_config(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid)

{

	struct rcom_config *rf = (struct rcom_config *) rc->rc_buf;



	if ((rc->rc_header.h_version & 0xFFFF0000) != DLM_HEADER_MAJOR) {

		log_error(ls, "version mismatch: %x nodeid %d: %x",

			  DLM_HEADER_MAJOR | DLM_HEADER_MINOR, nodeid,

			  rc->rc_header.h_version);

		return -EINVAL;

	}



	if (rf->rf_lvblen != ls->ls_lvblen ||

	    rf->rf_lsflags != ls->ls_exflags) {

		log_error(ls, "config mismatch: %d,%x nodeid %d: %d,%x",
@@ -145,8 +154,7 @@ int dlm_rcom_status(struct dlm_ls *ls, int nodeid) 
		log_debug(ls, "remote node %d not ready", nodeid);

		rc->rc_result = 0;

	} else

		error = check_config(ls, (struct rcom_config *) rc->rc_buf,

				     nodeid);

		error = check_config(ls, rc, nodeid);

	/* the caller looks at rc_result for the remote recovery status */

 out:

	return error;