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| author | NeilBrown <neilb@suse.de> | 2008-08-05 15:54:13 +1000 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2008-08-05 15:56:32 +1000 |
| commit | dba034eef2456d2a9f9a76806846c97acf6c3ad1 (patch) | |
| tree | 3cf51b72fc5be671e986a39c389aa5332994e2a2 /drivers/md | |
| parent | 2b25000bf5157c28d8591f03f0575248a8cbd900 (diff) | |
| download | blackbird-op-linux-dba034eef2456d2a9f9a76806846c97acf6c3ad1.tar.gz blackbird-op-linux-dba034eef2456d2a9f9a76806846c97acf6c3ad1.zip | |
Fail safely when trying to grow an array with a write-intent bitmap.
We cannot currently change the size of a write-intent bitmap.
So if we change the size of an array which has such a bitmap, it
tries to set bits beyond the end of the bitmap.
For now, simply reject any request to change the size of an array
which has a bitmap. mdadm can remove the bitmap and add a new one
after the array has changed size.
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/md.c | 5 | ||||
| -rw-r--r-- | drivers/md/raid5.c | 3 |
2 files changed, 8 insertions, 0 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index 8d11cd1a0d8b..6eb95451f161 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -4639,6 +4639,11 @@ static int update_size(mddev_t *mddev, sector_t num_sectors) */ if (mddev->sync_thread) return -EBUSY; + if (mddev->bitmap) + /* Sorry, cannot grow a bitmap yet, just remove it, + * grow, and re-add. + */ + return -EBUSY; rdev_for_each(rdev, tmp, mddev) { sector_t avail; avail = rdev->size * 2; diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 40e939675657..17e0953c3c06 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -4446,6 +4446,9 @@ static int raid5_check_reshape(mddev_t *mddev) return -EINVAL; /* Cannot shrink array or change level yet */ if (mddev->delta_disks == 0) return 0; /* nothing to do */ + if (mddev->bitmap) + /* Cannot grow a bitmap yet */ + return -EBUSY; /* Can only proceed if there are plenty of stripe_heads. * We need a minimum of one full stripe,, and for sensible progress |
