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md-cluster: remove a disk asynchronously from cluster environment

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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)