NFSv4: Fix second deadlock in nfs4_evict_inode()

If the inode is being evicted but has to return a layout first, then
that too can cause a deadlock in the corner case where the server
reboots.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index cf85f0ed1e065d1c4050e8f5aa5c0189dd86d224..e653654c10bcd8e49c2809891966448dc9975a41 100644 (file)
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -9658,15 +9658,20 @@ int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
                        &task_setup_data.rpc_client, &msg);
 
        dprintk("--> %s\n", __func__);
+       lrp->inode = nfs_igrab_and_active(lrp->args.inode);
        if (!sync) {
-               lrp->inode = nfs_igrab_and_active(lrp->args.inode);
                if (!lrp->inode) {
                        nfs4_layoutreturn_release(lrp);
                        return -EAGAIN;
                }
                task_setup_data.flags |= RPC_TASK_ASYNC;
        }
-       nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 0);
+       if (!lrp->inode)
+               nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
+                                  1);
+       else
+               nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
+                                  0);
        task = rpc_run_task(&task_setup_data);
        if (IS_ERR(task))
                return PTR_ERR(task);