freevxfs: implement ->alloc_inode and ->destroy_inode

This driver predates those methods and was trying to be clever allocating
it's own private data.  Switch to the generic scheme used by other file
systems.

Based on an earlier patch from Krzysztof Błaszkowski <kb@sysmikro.com.pl>.

Signed-off-by: Christoph Hellwig <hch@lst.de>

fs/freevxfs/vxfs_inode.h

@@ -151,6 +151,8 @@ struct vxfs_dinode {
  * The inode as represented in the main memory.
  */
 struct vxfs_inode_info {
+	struct inode	vfs_inode;
+
 	__u32		vii_mode;
 	__u32		vii_nlink;	/* Link count */
 	__u32		vii_uid;	/* UID */
@@ -183,4 +185,9 @@ struct vxfs_inode_info {
 #define vii_ext4	vii_org.ext4
 #define vii_typed	vii_org.typed
 
+static inline struct vxfs_inode_info *VXFS_INO(struct inode *inode)
+{
+	return container_of(inode, struct vxfs_inode_info, vfs_inode);
+}
+
 #endif /* _VXFS_INODE_H_ */