clean unix_bind() up a bit

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 88ab72820b9f7d815bbccc0577f3a6c1a83b39c4..b7667f81c49c8550d019b86acf341759a6335e36 100644 (file)
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -814,6 +814,34 @@ fail:
        return NULL;
 }
 
+static int unix_mknod(const char *sun_path, umode_t mode, struct path *res)
+{
+       struct dentry *dentry;
+       struct path path;
+       int err = 0;
+       /*
+        * Get the parent directory, calculate the hash for last
+        * component.
+        */
+       dentry = kern_path_create(AT_FDCWD, sun_path, &path, 0);
+       err = PTR_ERR(dentry);
+       if (IS_ERR(dentry))
+               return err;
+
+       /*
+        * All right, let's create it.
+        */
+       err = security_path_mknod(&path, dentry, mode, 0);
+       if (!err) {
+               err = vfs_mknod(path.dentry->d_inode, dentry, mode, 0);
+               if (!err) {
+                       res->mnt = mntget(path.mnt);
+                       res->dentry = dget(dentry);
+               }
+       }
+       done_path_create(&path, dentry);
+       return err;
+}
 
 static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 {
@@ -822,8 +850,6 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
        struct unix_sock *u = unix_sk(sk);
        struct sockaddr_un *sunaddr = (struct sockaddr_un *)uaddr;
        char *sun_path = sunaddr->sun_path;
-       struct dentry *dentry = NULL;
-       struct path path;
        int err;
        unsigned int hash;
        struct unix_address *addr;
@@ -860,40 +886,23 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
        atomic_set(&addr->refcnt, 1);
 
        if (sun_path[0]) {
-               umode_t mode;
-               err = 0;
-               /*
-                * Get the parent directory, calculate the hash for last
-                * component.
-                */
-               dentry = kern_path_create(AT_FDCWD, sun_path, &path, 0);
-               err = PTR_ERR(dentry);
-               if (IS_ERR(dentry))
-                       goto out_mknod_parent;
-
-               /*
-                * All right, let's create it.
-                */
-               mode = S_IFSOCK |
+               struct path path;
+               umode_t mode = S_IFSOCK |
                       (SOCK_INODE(sock)->i_mode & ~current_umask());
-               err = security_path_mknod(&path, dentry, mode, 0);
-               if (err)
-                       goto out_mknod_drop_write;
-               err = vfs_mknod(path.dentry->d_inode, dentry, mode, 0);
-out_mknod_drop_write:
-               if (err)
-                       goto out_mknod_dput;
-               mntget(path.mnt);
-               dget(dentry);
-               done_path_create(&path, dentry);
-               path.dentry = dentry;
-
+               err = unix_mknod(sun_path, mode, &path);
+               if (err) {
+                       if (err == -EEXIST)
+                               err = -EADDRINUSE;
+                       unix_release_addr(addr);
+                       goto out_up;
+               }
                addr->hash = UNIX_HASH_SIZE;
-       }
-
-       spin_lock(&unix_table_lock);
-
-       if (!sun_path[0]) {
+               hash = path.dentry->d_inode->i_ino & (UNIX_HASH_SIZE-1);
+               spin_lock(&unix_table_lock);
+               u->path = path;
+               list = &unix_socket_table[hash];
+       } else {
+               spin_lock(&unix_table_lock);
                err = -EADDRINUSE;
                if (__unix_find_socket_byname(net, sunaddr, addr_len,
                                              sk->sk_type, hash)) {
@@ -902,9 +911,6 @@ out_mknod_drop_write:
                }
 
                list = &unix_socket_table[addr->hash];
-       } else {
-               list = &unix_socket_table[dentry->d_inode->i_ino & (UNIX_HASH_SIZE-1)];
-               u->path = path;
        }
 
        err = 0;
@@ -918,14 +924,6 @@ out_up:
        mutex_unlock(&u->readlock);
 out:
        return err;
-
-out_mknod_dput:
-       done_path_create(&path, dentry);
-out_mknod_parent:
-       if (err == -EEXIST)
-               err = -EADDRINUSE;
-       unix_release_addr(addr);
-       goto out_up;
 }
 
 static void unix_state_double_lock(struct sock *sk1, struct sock *sk2)