[sheepdog] [PATCH v1] sheep/md: leave cluster if disk number equals zero in handling EIO

[Bingpeng Zhu]

When a node has single disk and faces EIO, md.nr_disks will change
from 1 to 0. In such a case, md_do_recover() will not call
kick_recover(). This may lead to a problematic behavior. We should
call leave_cluster() if md.nr_disks equals 0.

Reported-by: Hitoshi Mitake <mitake.hitoshi at lab.ntt.co.jp>
Signed-off-by: Bingpeng Zhu <bingpeng.zbp at alibaba-inc.com>
---
 sheep/md.c |   13 ++++++++-----
 1 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/sheep/md.c b/sheep/md.c
index 378d1f1..0313b95 100644
--- a/sheep/md.c
+++ b/sheep/md.c
@@ -541,11 +541,14 @@ static void md_do_recover(struct work *work)
 out:
 	sd_rw_unlock(&md.lock);
 
-	if (disk)
-		update_node_disks();
-
-	if (nr > 0)
-		kick_recover();
+	if (disk) {
+		if (nr > 0) {
+			update_node_disks();
+			kick_recover();
+		} else {
+			leave_cluster();
+		}
+	}
 
 	free(mw);
 }
-- 
1.7.1