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[54/70] NFSd: Ensure that the laundromat unhashes the client before releasing locks

Message ID 1397846704-14567-55-git-send-email-trond.myklebust@primarydata.com (mailing list archive)
State New, archived
Headers show

Commit Message

Trond Myklebust April 18, 2014, 6:44 p.m. UTC 
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>
---
 fs/nfsd/nfs4state.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
diff mbox

Patch

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 19f7739a156e..55a99ebaf6c9 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -3688,13 +3688,15 @@  nfs4_laundromat(struct nfsd_net *nn)
 		/* Hey, I'm busy with this guy! */
 		if (atomic_read(&clp->cl_refcount) != 0)
 			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);