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md-cluster: remove a disk asynchronously from cluster environment 

For cluster raid, if one disk couldn't be reach in one node, then
other nodes would receive the REMOVE message for the disk.

In receiving node, we can't call md_kick_rdev_from_array to remove
the disk from array synchronously since the disk might still be busy
in this node. So let's set a ClusterRemove flag on the disk, then
let the thread to do the removal job eventually.

Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: NeilBrown <neilb@suse.com>
This commit is contained in:
Guoqing Jiang 2015-12-21 10:50:59 +11:00 committed by NeilBrown
parent ac277c6a8a
commit 659b254fa7
3 changed files with 18 additions and 2 deletions
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7
drivers/md/md-cluster.c
View File

@ -440,8 +440,11 @@ static void process_remove_disk(struct mddev *mddev, struct cluster_msg *msg)
struct md_rdev *rdev = md_find_rdev_nr_rcu(mddev,
le32_to_cpu(msg->raid_slot));
if (rdev)
md_kick_rdev_from_array(rdev);
if (rdev) {
set_bit(ClusterRemove, &rdev->flags);
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
}
else
pr_warn("%s: %d Could not find disk(%d) to REMOVE\n",
__func__, __LINE__, le32_to_cpu(msg->raid_slot));

12
drivers/md/md.c
View File

@ -8318,6 +8318,18 @@ void md_check_recovery(struct mddev *mddev)
goto unlock;
}
if (mddev_is_clustered(mddev)) {
struct md_rdev *rdev;
/* kick the device if another node issued a
* remove disk.
*/
rdev_for_each(rdev, mddev) {
if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
rdev->raid_disk < 0)
md_kick_rdev_from_array(rdev);
}
}
if (!mddev->external) {
int did_change = 0;
spin_lock(&mddev->lock);

1
drivers/md/md.h
View File

@ -183,6 +183,7 @@ enum flag_bits {
* Usually, this device should be faster
* than other devices in the array
*/
ClusterRemove,
};
#define BB_LEN_MASK (0x00000000000001FFULL)