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From:   trondmy@kernel.org
To:     linux-nfs@vger.kernel.org
Subject: [PATCH] NFS/pnfs: Ensure that _pnfs_return_layout() waits for layoutreturn completion
Date:   Mon, 20 Apr 2020 14:03:16 -0400
Message-Id: <20200420180316.399519-1-trondmy@kernel.org>
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Sender: linux-nfs-owner@vger.kernel.org
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From: Trond Myklebust <trond.myklebust@hammerspace.com>

We require that any outstanding layout return completes before we can
free up the inode so that the layout itself can be freed.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---
 fs/nfs/pnfs.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index b8d78f393365..3bf6899cba95 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -1332,13 +1332,15 @@ _pnfs_return_layout(struct inode *ino)
 			!valid_layout) {
 		spin_unlock(&ino->i_lock);
 		dprintk("NFS: %s no layout segments to return\n", __func__);
-		goto out_put_layout_hdr;
+		goto out_wait_layoutreturn;
 	}
 
 	send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, NULL);
 	spin_unlock(&ino->i_lock);
 	if (send)
 		status = pnfs_send_layoutreturn(lo, &stateid, &cred, IOMODE_ANY, true);
+out_wait_layoutreturn:
+	wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, TASK_UNINTERRUPTIBLE);
 out_put_layout_hdr:
 	pnfs_free_lseg_list(&tmp_list);
 	pnfs_put_layout_hdr(lo);
-- 
2.25.3