[PATCH 3/3] ensure unique i_ino in filesystems without permanent inode numbers (pipefs)

[Jeff Layton <jlayton@redhat.com>]

pipefs is a rather busy filesystem and so is a good place to start to make
sure we flush out any performance problems

Signed-off-by: Jeff Layton <jlayton@redhat.com>

diff --git a/fs/pipe.c b/fs/pipe.c
index b1626f2..d74ae65 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -845,6 +845,9 @@ static struct inode * get_pipe_inode(voi
  	if (!inode)
  		goto fail_inode;

+	if (iunique_register(inode, 0))
+		goto fail_iput;
+
  	pipe = alloc_pipe_info(inode);
  	if (!pipe)
  		goto fail_iput;