diff options
| author | Jonathan Brassow <jbrassow@redhat.com> | 2011-01-13 23:14:34 +0100 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2011-01-13 23:14:34 +0100 |
| commit | a6ff7e089c7fca813c956ccbed824087e89a3a49 (patch) | |
| tree | 6537f72a2431c30601736676e9b1f89a7f1fe52e /drivers/md/md.c | |
| parent | md-new-param-to_sync_page_io (diff) | |
| download | linux-a6ff7e089c7fca813c956ccbed824087e89a3a49.tar.xz linux-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.c')
| -rw-r--r-- | drivers/md/md.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index 0bc10cc4b961..b98a85fd10b6 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -765,7 +765,7 @@ void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, */ struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev); - bio->bi_bdev = rdev->bdev; + bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev; bio->bi_sector = sector; bio_add_page(bio, page, size, 0); bio->bi_private = rdev; @@ -803,7 +803,8 @@ int sync_page_io(mdk_rdev_t *rdev, sector_t sector, int size, rw |= REQ_SYNC | REQ_UNPLUG; - bio->bi_bdev = rdev->bdev; + bio->bi_bdev = (metadata_op && rdev->meta_bdev) ? + rdev->meta_bdev : rdev->bdev; if (metadata_op) bio->bi_sector = sector + rdev->sb_start; else @@ -4435,7 +4436,9 @@ int md_run(mddev_t *mddev) * We don't want the data to overlap the metadata, * Internal Bitmap issues have been handled elsewhere. */ - if (rdev->data_offset < rdev->sb_start) { + if (rdev->meta_bdev) { + /* Nothing to check */; + } else if (rdev->data_offset < rdev->sb_start) { if (mddev->dev_sectors && rdev->data_offset + mddev->dev_sectors > rdev->sb_start) { @@ -5532,7 +5535,6 @@ static int update_size(mddev_t *mddev, sector_t num_sectors) * sb_start or, if that is <data_offset, it must fit before the size * of each device. If num_sectors is zero, we find the largest size * that fits. - */ if (mddev->sync_thread) return -EBUSY; |