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-rw-r--r--drivers/md/raid1.h7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/md/raid1.h b/drivers/md/raid1.h
index c732b6cce93..80ded139314 100644
--- a/drivers/md/raid1.h
+++ b/drivers/md/raid1.h
@@ -12,6 +12,9 @@ struct mirror_info {
* pool was allocated for, so they know how much to allocate and free.
* mddev->raid_disks cannot be used, as it can change while a pool is active
* These two datums are stored in a kmalloced struct.
+ * The 'raid_disks' here is twice the raid_disks in r1conf.
+ * This allows space for each 'real' device can have a replacement in the
+ * second half of the array.
*/
struct pool_info {
@@ -21,7 +24,9 @@ struct pool_info {
struct r1conf {
struct mddev *mddev;
- struct mirror_info *mirrors;
+ struct mirror_info *mirrors; /* twice 'raid_disks' to
+ * allow for replacements.
+ */
int raid_disks;
/* When choose the best device for a read (read_balance())