From bedd86b7773fd97f0d708cc0c371c8963ba7ba9a Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Wed, 11 May 2011 14:26:20 +1000 Subject: md: reject a re-add request that cannot be honoured. The 'add_new_disk' ioctl can be used to add a device either as a spare, or as an active disk that just needs to be resynced based on write-intent-bitmap information (re-add) Currently if a re-add is requested but fails we add as a spare instead. This makes it impossible for user-space to check for failure. So change to require that a re-add attempt will either succeed or completely fail. User-space can then decide what to do next. Signed-off-by: NeilBrown --- drivers/md/md.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'drivers/md') diff --git a/drivers/md/md.c b/drivers/md/md.c index 4a4c0f80bdeb..5469ae35ee15 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -5216,6 +5216,16 @@ static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) } else super_types[mddev->major_version]. validate_super(mddev, rdev); + if ((info->state & (1<flags) || + rdev->raid_disk != info->raid_disk)) { + /* This was a hot-add request, but events doesn't + * match, so reject it. + */ + export_rdev(rdev); + return -EINVAL; + } + if (test_bit(In_sync, &rdev->flags)) rdev->saved_raid_disk = rdev->raid_disk; else -- cgit v1.2.3