mds: broadcast quota message to client when disable quota

When disable quota by setting quota.max_files or quota.max_bytes
to zero, client does not receive the quota broadcast message.

Signed-off-by: Junhui Tang <tangjunhui@sangfor.com.cn>
Fixes: https://tracker.ceph.com/issues/38054
(cherry picked from commit 061ace2)

Conflicts:
	src/mds/MDCache.cc : Resolved in broadcast_quota_to_client

src/mds/MDCache.cc

@@ -2015,14 +2015,15 @@ void MDCache::project_rstat_frag_to_inode(nest_info_t& rstat, nest_info_t& accou
   }
 }
 
-void MDCache::broadcast_quota_to_client(CInode *in, client_t exclude_ct)
+void MDCache::broadcast_quota_to_client(CInode *in, client_t exclude_ct, bool quota_change)
 {
   if (!in->is_auth() || in->is_frozen())
     return;
 
   auto i = in->get_projected_inode();
-
-  if (!i->quota.is_enable())
+
+  if (!i->quota.is_enable() &&
+  	  !quota_change)
     return;
 
   for (map<client_t,Capability*>::iterator it = in->client_caps.begin();

src/mds/MDCache.h

@@ -400,7 +400,7 @@ class MDCache {
   void project_rstat_frag_to_inode(nest_info_t& rstat, nest_info_t& accounted_rstat,
 				   snapid_t ofirst, snapid_t last, 
 				   CInode *pin, bool cow_head);
-  void broadcast_quota_to_client(CInode *in, client_t exclude_ct = -1);
+  void broadcast_quota_to_client(CInode *in, client_t exclude_ct = -1, bool quota_change = false);
   void predirty_journal_parents(MutationRef mut, EMetaBlob *blob,
 				CInode *in, CDir *parent,
 				int flags, int linkunlink=0,

src/mds/Server.cc

@@ -4827,7 +4827,7 @@ void Server::handle_set_vxattr(MDRequestRef& mdr, CInode *cur,
     pip = &pi.inode;
 
     client_t exclude_ct = mdr->get_client();
-    mdcache->broadcast_quota_to_client(cur, exclude_ct);
+    mdcache->broadcast_quota_to_client(cur, exclude_ct, true);
   } else if (name.find("ceph.dir.pin") == 0) {
     if (!cur->is_dir() || cur->is_root()) {
       respond_to_request(mdr, -EINVAL);