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authorJonathan Brassow <jbrassow@redhat.com>2011-01-14 01:14:34 +0300
committerNeilBrown <neilb@suse.de>2011-01-14 01:14:34 +0300
commita6ff7e089c7fca813c956ccbed824087e89a3a49 (patch)
tree6537f72a2431c30601736676e9b1f89a7f1fe52e /drivers/md/md.h
parentccebd4c4159462c96397ae9af9c667bb394d7b70 (diff)
downloadlinux-a6ff7e089c7fca813c956ccbed824087e89a3a49.tar.xz
md: separate meta and data devs
Allow the metadata to be on a separate device from the data. This doesn't mean the data and metadata will by on separate physical devices - it simply gives device-mapper and userspace tools more flexibility. Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md/md.h')
-rw-r--r--drivers/md/md.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 7e4f358a26a6..eec517ced31a 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -60,6 +60,12 @@ struct mdk_rdev_s
mddev_t *mddev; /* RAID array if running */
int last_events; /* IO event timestamp */
+ /*
+ * If meta_bdev is non-NULL, it means that a separate device is
+ * being used to store the metadata (superblock/bitmap) which
+ * would otherwise be contained on the same device as the data (bdev).
+ */
+ struct block_device *meta_bdev;
struct block_device *bdev; /* block device handle */
struct page *sb_page;