[PATCH 2/7] shmem: use d_duplicate()

[NeilBrown]

From: NeilBrown <neil@xxxxxxxxxx>

To prepare for d_alloc_parallel() being permitted without a directory
lock, use d_duplicate() when duplicating a dentry in order to create a
whiteout.

Signed-off-by: NeilBrown <neil@xxxxxxxxxx>
---
 mm/shmem.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/shmem.c b/mm/shmem.c
index 897fa2b61346..8fbab956466c 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -3976,11 +3976,12 @@ static int shmem_whiteout(struct mnt_idmap *idmap,
 	struct dentry *whiteout;
 	int error;
 
-	whiteout = d_alloc(old_dentry->d_parent, &old_dentry->d_name);
+	whiteout = d_duplicate(old_dentry);
 	if (!whiteout)
 		return -ENOMEM;
 	error = shmem_mknod(idmap, old_dir, whiteout,
 			    S_IFCHR | WHITEOUT_MODE, WHITEOUT_DEV);
+	d_lookup_done(whiteout);
 	dput(whiteout);
 	return error;
 }
-- 
2.50.0.107.gf914562f5916.dirty