ceph: avoid picking MDS that is not active (d66bbd44) · Commits · 戴 / test

Ignore replication or auth frag data if it indicates an MDS that is not active. This can happen if the MDS shuts down and the client has stale data about the namespace distribution across the MDS cluster. If that's the case, fall back to directing the request based on the auth cap (which should always be accurate). Signed-off-by:

Sage Weil <sage@newdream.net>

fs/ceph/mds_client.c

+7 −3

Original line number	Diff line number	Diff line
		@@ -693,8 +693,10 @@ static int __choose_mds(struct ceph_mds_client *mdsc,
		dout("choose_mds %p %llx.%llx "
		"frag %u mds%d (%d/%d)\n",
		inode, ceph_vinop(inode),
		frag.frag, frag.mds,
		frag.frag, mds,
		(int)r, frag.ndist);
		if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
		CEPH_MDS_STATE_ACTIVE)
		return mds;
		}

		@@ -708,6 +710,8 @@ static int __choose_mds(struct ceph_mds_client *mdsc,
		dout("choose_mds %p %llx.%llx "
		"frag %u mds%d (auth)\n",
		inode, ceph_vinop(inode), frag.frag, mds);
		if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
		CEPH_MDS_STATE_ACTIVE)
		return mds;
		}
		}

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