ceph: unify cap flush and snapcap flush

This patch includes following changes
- Assign flush tid to snapcap flush
- Remove session's s_cap_snaps_flushing list. Add inode to session's
  s_cap_flushing list instead. Inode is removed from the list when
  there is no pending snapcap flush or cap flush.
- make __kick_flushing_caps() re-send both snapcap flushes and cap
  flushes.

Signed-off-by: Yan, Zheng <zyan@redhat.com>

1 files changed, 12 insertions, 12 deletions

diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 29e8b7bd9413..08ed51299f9f 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -147,6 +147,13 @@ struct ceph_cap {
 #define CHECK_CAPS_AUTHONLY   2  /* only check auth cap */
 #define CHECK_CAPS_FLUSH      4  /* flush any dirty caps */
 
+struct ceph_cap_flush {
+	u64 tid;
+	int caps; /* 0 means capsnap */
+	struct list_head g_list; // global
+	struct list_head i_list; // per inode
+};
+
 /*
  * Snapped cap state that is pending flush to mds.  When a snapshot occurs,
  * we first complete any in-process sync writes and writeback any dirty
@@ -154,10 +161,11 @@ struct ceph_cap {
  */
 struct ceph_cap_snap {
 	atomic_t nref;
-	struct ceph_inode_info *ci;
-	struct list_head ci_item, flushing_item;
+	struct list_head ci_item;
 
-	u64 follows, flush_tid;
+	struct ceph_cap_flush cap_flush;
+
+	u64 follows;
 	int issued, dirty;
 	struct ceph_snap_context *context;
 
@@ -186,13 +194,6 @@ static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap)
 	}
 }
 
-struct ceph_cap_flush {
-	u64 tid;
-	int caps;
-	struct list_head g_list; // global
-	struct list_head i_list; // per inode
-};
-
 /*
  * The frag tree describes how a directory is fragmented, potentially across
  * multiple metadata servers.  It is also used to indicate points where
@@ -888,8 +889,7 @@ extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had);
 extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
 				       struct ceph_snap_context *snapc);
 extern void __ceph_flush_snaps(struct ceph_inode_info *ci,
-			       struct ceph_mds_session **psession,
-			       int again);
+			       struct ceph_mds_session **psession);
 extern void ceph_check_caps(struct ceph_inode_info *ci, int flags,
 			    struct ceph_mds_session *session);
 extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc);