Revert "af_unix: fix hard linked sockets on overlay"

This reverts commit eb0a4a47ae89aaa0674ab3180de6a162f3be2ddf.

Since commit 51f7e52dc943 ("ovl: share inode for hard link") there's no
need to call d_real_inode() to check two overlay inodes for equality.

Side effect of this revert is that it's no longer possible to connect one
socket on overlayfs to one on the underlying layer (something which didn't
make sense anyway).

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 2358f2690ec58c20aeb77fb60ac45b3db27ecac6..6f72508cccb7523bb154d92c3e1dcdf480a15497 100644 (file)
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -315,7 +315,7 @@ static struct sock *unix_find_socket_byinode(struct inode *i)
                    &unix_socket_table[i->i_ino & (UNIX_HASH_SIZE - 1)]) {
                struct dentry *dentry = unix_sk(s)->path.dentry;
 
-               if (dentry && d_real_inode(dentry) == i) {
+               if (dentry && d_backing_inode(dentry) == i) {
                        sock_hold(s);
                        goto found;
                }
@@ -913,7 +913,7 @@ static struct sock *unix_find_other(struct net *net,
                err = kern_path(sunname->sun_path, LOOKUP_FOLLOW, &path);
                if (err)
                        goto fail;
-               inode = d_real_inode(path.dentry);
+               inode = d_backing_inode(path.dentry);
                err = inode_permission(inode, MAY_WRITE);
                if (err)
                        goto put_fail;
@@ -1040,7 +1040,7 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
                        goto out_up;
                }
                addr->hash = UNIX_HASH_SIZE;
-               hash = d_real_inode(path.dentry)->i_ino & (UNIX_HASH_SIZE - 1);
+               hash = d_backing_inode(path.dentry)->i_ino & (UNIX_HASH_SIZE - 1);
                spin_lock(&unix_table_lock);
                u->path = path;
                list = &unix_socket_table[hash];