md/raid10: collect some geometry fields into a dedicated structure.
We will shortly be adding reshape support for RAID10 which will
require it having 2 concurrent geometries (before and after).
To make that easier, collect most geometry fields into 'struct geom'
and access them from there. Then we will more easily be able to add
a second set of fields.
Note that 'copies' is not in this struct and so cannot be changed.
There is little need to change this number and doing so is a lot
more difficult as it requires reallocating more things.
So leave it out for now.
Signed-off-by: NeilBrown <neilb@suse.de>
diff --git a/drivers/md/raid10.h b/drivers/md/raid10.h
index 7c615613..4c4942a 100644
--- a/drivers/md/raid10.h
+++ b/drivers/md/raid10.h
@@ -14,33 +14,34 @@
struct r10conf {
struct mddev *mddev;
struct mirror_info *mirrors;
- int raid_disks;
spinlock_t device_lock;
/* geometry */
- int near_copies; /* number of copies laid out
+ struct geom {
+ int raid_disks;
+ int near_copies; /* number of copies laid out
* raid0 style */
- int far_copies; /* number of copies laid out
+ int far_copies; /* number of copies laid out
* at large strides across drives
*/
- int far_offset; /* far_copies are offset by 1
+ int far_offset; /* far_copies are offset by 1
* stripe instead of many
*/
- int copies; /* near_copies * far_copies.
- * must be <= raid_disks
- */
- sector_t stride; /* distance between far copies.
+ sector_t stride; /* distance between far copies.
* This is size / far_copies unless
* far_offset, in which case it is
* 1 stripe.
*/
+ int chunk_shift; /* shift from chunks to sectors */
+ sector_t chunk_mask;
+ } geo;
+ int copies; /* near_copies * far_copies.
+ * must be <= raid_disks
+ */
sector_t dev_sectors; /* temp copy of
* mddev->dev_sectors */
- int chunk_shift; /* shift from chunks to sectors */
- sector_t chunk_mask;
-
struct list_head retry_list;
/* queue pending writes and submit them on unplug */
struct bio_list pending_bio_list;