md-cluster: Avoid the resync ping-pong (ac277c6a) · Commits · 戴 / test

If a RESYNCING message with (0,0) has been sent before, do not send it again. This avoids a resync ping pong between the nodes. We read the bitmap lockresource's LVB to figure out the previous value of the RESYNCING message. Signed-off-by:

Goldwyn Rodrigues <rgoldwyn@suse.com> Signed-off-by:

NeilBrown <neilb@suse.com>

drivers/md/md-cluster.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -882,8 +882,16 @@ static int resync_start(struct mddev *mddev)
		static int resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi)
		{
		struct md_cluster_info *cinfo = mddev->cluster_info;
		struct resync_info ri;
		struct cluster_msg cmsg = {0};

		/* do not send zero again, if we have sent before */
		if (hi == 0) {
		memcpy(&ri, cinfo->bitmap_lockres->lksb.sb_lvbptr, sizeof(struct resync_info));
		if (le64_to_cpu(ri.hi) == 0)
		return 0;
		}

		add_resync_info(cinfo->bitmap_lockres, lo, hi);
		/* Re-acquire the lock to refresh LVB */
		dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW);

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