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ceph: avoid picking MDS that is not active

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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>
This commit is contained in:
Sage Weil 2011-01-21 21:16:46 -08:00
parent 7e57b81c76
commit d66bbd441c
1 changed files with 7 additions and 3 deletions
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6
fs/ceph/mds_client.c
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@ -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;
}
}