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| author | Jonathan Brassow <jbrassow@redhat.com> | 2011-01-14 09:14:34 +1100 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2011-01-14 09:14:34 +1100 |
| commit | a6ff7e089c7fca813c956ccbed824087e89a3a49 (patch) | |
| tree | 6537f72a2431c30601736676e9b1f89a7f1fe52e /drivers/md/md.h | |
| parent | ccebd4c4159462c96397ae9af9c667bb394d7b70 (diff) | |
| download | linux-3.10-a6ff7e089c7fca813c956ccbed824087e89a3a49.tar.gz linux-3.10-a6ff7e089c7fca813c956ccbed824087e89a3a49.tar.bz2 linux-3.10-a6ff7e089c7fca813c956ccbed824087e89a3a49.zip | |
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.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/md/md.h b/drivers/md/md.h index 7e4f358a26a..eec517ced31 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; |