[PATCH 3/4] pnfs: add a nfs4_get_deviceid helper

[Christoph Hellwig <hch@lst.de>]

This will be used by the block layout driver when splitting extents.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/nfs/pnfs.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index ba468e2..c27fe18 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -277,6 +277,13 @@ void nfs4_deviceid_purge_client(const struct nfs_client *);
 int nfs4_deviceid_getdevicelist(struct nfs_server *server,
 		const struct nfs_fh *fh);
 
+static inline struct nfs4_deviceid_node *
+nfs4_get_deviceid(struct nfs4_deviceid_node *d)
+{
+	atomic_inc(&d->ref);
+	return d;
+}
+
 static inline struct pnfs_layout_segment *
 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 {
-- 
1.9.1