dm-io.c:  Add io routines to perform io on a vm area.
--- diff/drivers/md/dm-io.c	2004-03-16 11:47:20.307672696 +0000
+++ source/drivers/md/dm-io.c	2004-03-16 11:47:22.682311696 +0000
@@ -420,6 +420,28 @@ void bvec_dp_init(struct dpages *dp, str
 	dp->context_ptr = bvec;
 }
 
+void vm_get_page(struct dpages *dp,
+		 struct page **p, unsigned long *len, unsigned *offset)
+{
+	*p = vmalloc_to_page(dp->context_ptr);
+	*offset = dp->context_u;
+	*len = PAGE_SIZE - dp->context_u;
+}
+
+void vm_next_page(struct dpages *dp)
+{
+	dp->context_ptr += PAGE_SIZE - dp->context_u;
+	dp->context_u = 0;
+}
+
+void vm_dp_init(struct dpages *dp, void *data)
+{
+	dp->get_page = vm_get_page;
+	dp->next_page = vm_next_page;
+	dp->context_u = ((unsigned) data) & (PAGE_SIZE - 1);
+	dp->context_ptr = data;
+}
+
 /*-----------------------------------------------------------------
  * IO routines that accept a list of pages.
  *---------------------------------------------------------------*/
@@ -554,6 +576,14 @@ int dm_io_sync_bvec(unsigned int num_reg
 	return sync_io(num_regions, where, rw, &dp, error_bits);
 }
 
+int dm_io_sync_vm(unsigned int num_regions, struct io_region *where, int rw,
+		  void *data, unsigned long *error_bits)
+{
+	struct dpages dp;
+	vm_dp_init(&dp, data);
+	return sync_io(num_regions, where, rw, &dp, error_bits);
+}
+
 int dm_io_async(unsigned int num_regions, struct io_region *where, int rw,
 		struct page_list *pl, unsigned int offset,
 		io_notify_fn fn, void *context)
@@ -571,6 +601,13 @@ int dm_io_async_bvec(unsigned int num_re
 	return async_io(num_regions, where, rw, &dp, fn, context);
 }
 
+int dm_io_async_vm(unsigned int num_regions, struct io_region *where, int rw,
+		   void *data, io_notify_fn fn, void *context)
+{
+	struct dpages dp;
+	vm_dp_init(&dp, data);
+	return async_io(num_regions, where, rw, &dp, fn, context);
+}
 
 EXPORT_SYMBOL(dm_io_get);
 EXPORT_SYMBOL(dm_io_put);
--- diff/drivers/md/dm-io.h	2004-03-16 11:47:20.307672696 +0000
+++ source/drivers/md/dm-io.h	2004-03-16 11:47:22.683311544 +0000
@@ -55,6 +55,8 @@ int dm_io_sync(unsigned int num_regions,
 int dm_io_sync_bvec(unsigned int num_regions, struct io_region *where, int rw,
 		    struct bio_vec *bvec, unsigned long *error_bits);
 
+int dm_io_sync_vm(unsigned int num_regions, struct io_region *where, int rw,
+		  void *data, unsigned long *error_bits);
 
 /*
  * Aynchronous IO.
@@ -69,4 +71,7 @@ int dm_io_async(unsigned int num_regions
 int dm_io_async_bvec(unsigned int num_regions, struct io_region *where, int rw,
 		     struct bio_vec *bvec, io_notify_fn fn, void *context);
 
+int dm_io_async_vm(unsigned int num_regions, struct io_region *where, int rw,
+		   void *data, io_notify_fn fn, void *context);
+
 #endif