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drbd: fix "stalled" empty resync 

With sync-after dependencies, given "lucky" timing of pause/unpause
events, and the end of an empty (0 bits set) resync was sometimes not
detected on the SyncTarget, leading to a "stalled" SyncSource state.

Fixed this by expecting not only "Inconsistent -> UpToDate" but also
"Consistent -> UpToDate" transitions for the peer disk state
to end a resync.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Philipp Reisner 2011-09-29 13:00:14 +02:00
parent 22d81140ae
commit 9bcd252182
2 changed files with 14 additions and 5 deletions
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8
drivers/block/drbd/drbd_nl.c
View File

@ -2262,7 +2262,7 @@ int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
if (rs.no_resync && mdev->tconn->agreed_pro_version < 93) {
retcode = ERR_NEED_APV_93;
goto fail;
goto fail_ldev;
}
rcu_read_lock();
@ -2272,7 +2272,7 @@ int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
if (!new_disk_conf) {
retcode = ERR_NOMEM;
goto fail;
goto fail_ldev;
}
}
@ -2310,6 +2310,10 @@ int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
fail:
drbd_adm_finish(info, retcode);
return 0;
fail_ldev:
put_ldev(mdev);
goto fail;
}
int drbd_adm_resource_opts(struct sk_buff *skb, struct genl_info *info)

11
drivers/block/drbd/drbd_receiver.c
View File

@ -3748,9 +3748,14 @@ static int receive_state(struct drbd_tconn *tconn, struct packet_info *pi)
os = ns = drbd_read_state(mdev);
spin_unlock_irq(&mdev->tconn->req_lock);
/* peer says his disk is uptodate, while we think it is inconsistent,
* and this happens while we think we have a sync going on. */
if (os.pdsk == D_INCONSISTENT && real_peer_disk == D_UP_TO_DATE &&
/* If this is the "end of sync" confirmation, usually the peer disk
* transitions from D_INCONSISTENT to D_UP_TO_DATE. For empty (0 bits
* set) resync started in PausedSyncT, or if the timing of pause-/
* unpause-sync events has been "just right", the peer disk may
* transition from D_CONSISTENT to D_UP_TO_DATE as well.
*/
if ((os.pdsk == D_INCONSISTENT || os.pdsk == D_CONSISTENT) &&
real_peer_disk == D_UP_TO_DATE &&
os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) {
/* If we are (becoming) SyncSource, but peer is still in sync
* preparation, ignore its uptodate-ness to avoid flapping, it