Add dm_snap_origin function

Add function dm_snap_origin, it will be used for checking chunk size against
origin sector size.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

---
drivers/md/dm-exception-store.h | 3 ++-
drivers/md/dm-snap.c | 6 ++++++
2 files changed, 8 insertions(+), 1 deletion(-)

Index: linux-2.6.34-rc1-devel/drivers/md/dm-exception-store.h
================================================== =================
--- linux-2.6.34-rc1-devel.orig/drivers/md/dm-exception-store.h 2010-03-12 14:41:37.000000000 +0100
+++ linux-2.6.34-rc1-devel/drivers/md/dm-exception-store.h 2010-03-12 14:42:11.000000000 +0100
@@ -126,8 +126,9 @@ struct dm_exception_store {
};

/*
- * Obtain the cow device used by a given snapshot.
+ * Obtain the origin and cow device used by a given snapshot.
*/
+struct dm_dev *dm_snap_origin(struct dm_snapshot *snap);
struct dm_dev *dm_snap_cow(struct dm_snapshot *snap);

/*
Index: linux-2.6.34-rc1-devel/drivers/md/dm-snap.c
================================================== =================
--- linux-2.6.34-rc1-devel.orig/drivers/md/dm-snap.c 2010-03-12 14:41:20.000000000 +0100
+++ linux-2.6.34-rc1-devel/drivers/md/dm-snap.c 2010-03-12 14:42:37.000000000 +0100
@@ -148,6 +148,12 @@ struct dm_snapshot {
#define RUNNING_MERGE 0
#define SHUTDOWN_MERGE 1

+struct dm_dev *dm_snap_origin(struct dm_snapshot *s)
+{
+ return s->origin;
+}
+EXPORT_SYMBOL(dm_snap_origin);
+
struct dm_dev *dm_snap_cow(struct dm_snapshot *s)
{
return s->cow;

--
dm-devel mailing list
dm-devel@redhat.com
https://www.redhat.com/mailman/listinfo/dm-devel

On Mon, Mar 15 2010 at 2:01am -0400,
Mikulas Patocka <mpatocka@redhat.com> wrote:

> Add dm_snap_origin function
>
> Add function dm_snap_origin, it will be used for checking chunk size against
> origin sector size.
>
> Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

Reviewed-by: Mike Snitzer <snitzer@redhat.com>

--
dm-devel mailing list
dm-devel@redhat.com
https://www.redhat.com/mailman/listinfo/dm-devel