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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>
This commit is contained in:
Trond Myklebust 2021-06-01 11:35:56 -04:00
parent dfe1fe75e0
commit c3aba897c6
1 changed files with 7 additions and 2 deletions
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9
fs/nfs/nfs4proc.c
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@ -9658,15 +9658,20 @@ int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
&task_setup_data.rpc_client, &msg);
dprintk("--> %s\n", __func__);
if (!sync) {
lrp->inode = nfs_igrab_and_active(lrp->args.inode);
if (!sync) {
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);