take bdi setup/destruction into cifs_mount/cifs_umount

Acked-by: Pavel Shilovsky <piastryyy@gmail.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/cifs/cifsfs.c

@@ -116,18 +116,12 @@ cifs_read_super(struct super_block *sb, struct smb_vol *volume_info,
 	spin_lock_init(&cifs_sb->tlink_tree_lock);
 	cifs_sb->tlink_tree = RB_ROOT;
 
-	rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
-	if (rc)
-		return rc;
-
-	cifs_sb->bdi.ra_pages = default_backing_dev_info.ra_pages;
-
 	rc = cifs_mount(sb, cifs_sb, volume_info, devname);
 
 	if (rc) {
 		if (!silent)
 			cERROR(1, "cifs_mount failed w/return code = %d", rc);
-		goto out_mount_failed;
+		return rc;
 	}
 
 	sb->s_magic = CIFS_MAGIC_NUMBER;
@@ -171,9 +165,6 @@ out_no_root:
 		iput(inode);
 
 	cifs_umount(sb, cifs_sb);
-
-out_mount_failed:
-	bdi_destroy(&cifs_sb->bdi);
 	return rc;
 }
 
@@ -199,7 +190,6 @@ cifs_put_super(struct super_block *sb)
 	}
 
 	unload_nls(cifs_sb->local_nls);
-	bdi_destroy(&cifs_sb->bdi);
 	kfree(cifs_sb);
 }
 

fs/cifs/connect.c

@@ -2983,6 +2983,13 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 	struct tcon_link *tlink;
 #ifdef CONFIG_CIFS_DFS_UPCALL
 	int referral_walks_count = 0;
+
+	rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
+	if (rc)
+		return rc;
+
+	cifs_sb->bdi.ra_pages = default_backing_dev_info.ra_pages;
+
 try_mount_again:
 	/* cleanup activities if we're chasing a referral */
 	if (referral_walks_count) {
@@ -3007,6 +3014,7 @@ try_mount_again:
 	srvTcp = cifs_get_tcp_session(volume_info);
 	if (IS_ERR(srvTcp)) {
 		rc = PTR_ERR(srvTcp);
+		bdi_destroy(&cifs_sb->bdi);
 		goto out;
 	}
 
@@ -3161,6 +3169,7 @@ mount_fail_check:
 			cifs_put_smb_ses(pSesInfo);
 		else
 			cifs_put_tcp_session(srvTcp);
+		bdi_destroy(&cifs_sb->bdi);
 		goto out;
 	}
 
@@ -3357,6 +3366,7 @@ cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
 	}
 	spin_unlock(&cifs_sb->tlink_tree_lock);
 
+	bdi_destroy(&cifs_sb->bdi);
 	return 0;
 }