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nfsd: Ensure that the laundromat unhashes the client before releasing locks

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If we leave the client on the confirmed/unconfirmed tables, and leave
the sessions visible on the sessionid_hashtbl, then someone might
find them before we've had a chance to destroy them.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Trond Myklebust 2014-07-30 08:27:03 -04:00 committed by J. Bruce Fields
parent 4beb345b37
commit 4864af97e0
1 changed files with 3 additions and 1 deletions
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4
fs/nfsd/nfs4state.c
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@ -4125,13 +4125,15 @@ nfs4_laundromat(struct nfsd_net *nn)
clp->cl_clientid.cl_id);
continue;
}
list_move(&clp->cl_lru, &reaplist);
unhash_client_locked(clp);
list_add(&clp->cl_lru, &reaplist);
}
spin_unlock(&nn->client_lock);
list_for_each_safe(pos, next, &reaplist) {
clp = list_entry(pos, struct nfs4_client, cl_lru);
dprintk("NFSD: purging unused client (clientid %08x)\n",
clp->cl_clientid.cl_id);
list_del_init(&clp->cl_lru);
expire_client(clp);
}
spin_lock(&state_lock);