ceph: renew caps for read/write if mds session got killed.
When mds session gets killed, read/write operation may hang.
Client waits for Frw caps, but mds does not know what caps client
wants. To recover this, client sends an open request to mds. The
request will tell mds what caps client wants.
Signed-off-by: Yan, Zheng <zyan@redhat.com>
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index cff85af..1e5965d 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -1133,6 +1133,8 @@
struct ceph_mds_client *mdsc =
ceph_sb_to_client(inode->i_sb)->mdsc;
+ ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
+
while (true) {
struct rb_node *n = rb_first(&ci->i_cap_flush_tree);
if (!n)
@@ -1181,7 +1183,9 @@
list_del(&cf->list);
ceph_free_cap_flush(cf);
}
- while (drop--)
+
+ wake_up_all(&ci->i_cap_wq);
+ if (drop)
iput(inode);
return 0;
}
