ceph: put unused osd connections on lru

Instead of removing osd connection immediately when the
requests list is empty, put the osd connection on an lru.
Only if that osd has not been used for more than a specified
time, will it be removed.

Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/fs/ceph/osd_client.h b/fs/ceph/osd_client.h
index 8d533d9406ff..70f31b61f02c 100644
--- a/fs/ceph/osd_client.h
+++ b/fs/ceph/osd_client.h
@@ -31,9 +31,11 @@ struct ceph_osd {
         struct rb_node o_node;
         struct ceph_connection o_con;
         struct list_head o_requests;
+        struct list_head o_osd_lru;
         struct ceph_authorizer *o_authorizer;
         void *o_authorizer_buf, *o_authorizer_reply_buf;
         size_t o_authorizer_buf_len, o_authorizer_reply_buf_len;
+        unsigned long lru_ttl;
 };
 
 /* an in-flight request */
@@ -90,11 +92,13 @@ struct ceph_osd_client {
 
         struct mutex           request_mutex;
         struct rb_root         osds;          /* osds */
+        struct list_head       osd_lru;       /* idle osds */
         u64                    timeout_tid;   /* tid of timeout triggering rq */
         u64                    last_tid;      /* tid of last request */
         struct rb_root         requests;      /* pending requests */
         int                    num_requests;
         struct delayed_work    timeout_work;
+        struct delayed_work    osds_timeout_work;
 #ifdef CONFIG_DEBUG_FS
         struct dentry          *debugfs_file;
 #endif