63 void ceph_get_snap_realm(struct ceph_mds_client *mdsc,  in ceph_get_snap_realm()  argument
75 		spin_lock(&mdsc->snap_empty_lock);  in ceph_get_snap_realm()
77 		spin_unlock(&mdsc->snap_empty_lock);  in ceph_get_snap_realm()
109 	struct ceph_mds_client *mdsc,  in ceph_create_snap_realm()  argument
126 	__insert_snap_realm(&mdsc->snap_realms, realm);  in ceph_create_snap_realm()
136 static struct ceph_snap_realm *__lookup_snap_realm(struct ceph_mds_client *mdsc,  in __lookup_snap_realm()  argument
139 	struct rb_node *n = mdsc->snap_realms.rb_node;  in __lookup_snap_realm()
156 struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc,  in ceph_lookup_snap_realm()  argument
160 	r = __lookup_snap_realm(mdsc, ino);  in ceph_lookup_snap_realm()
162 		ceph_get_snap_realm(mdsc, r);  in ceph_lookup_snap_realm()
166 static void __put_snap_realm(struct ceph_mds_client *mdsc,
172 static void __destroy_snap_realm(struct ceph_mds_client *mdsc,  in __destroy_snap_realm()  argument
177 	rb_erase(&realm->node, &mdsc->snap_realms);  in __destroy_snap_realm()
181 		__put_snap_realm(mdsc, realm->parent);  in __destroy_snap_realm()
193 static void __put_snap_realm(struct ceph_mds_client *mdsc,  in __put_snap_realm()  argument
199 		__destroy_snap_realm(mdsc, realm);  in __put_snap_realm()
205 void ceph_put_snap_realm(struct ceph_mds_client *mdsc,  in ceph_put_snap_realm()  argument
213 	if (down_write_trylock(&mdsc->snap_rwsem)) {  in ceph_put_snap_realm()
214 		__destroy_snap_realm(mdsc, realm);  in ceph_put_snap_realm()
215 		up_write(&mdsc->snap_rwsem);  in ceph_put_snap_realm()
217 		spin_lock(&mdsc->snap_empty_lock);  in ceph_put_snap_realm()
218 		list_add(&realm->empty_item, &mdsc->snap_empty);  in ceph_put_snap_realm()
219 		spin_unlock(&mdsc->snap_empty_lock);  in ceph_put_snap_realm()
230 static void __cleanup_empty_realms(struct ceph_mds_client *mdsc)  in __cleanup_empty_realms()  argument
234 	spin_lock(&mdsc->snap_empty_lock);  in __cleanup_empty_realms()
235 	while (!list_empty(&mdsc->snap_empty)) {  in __cleanup_empty_realms()
236 		realm = list_first_entry(&mdsc->snap_empty,  in __cleanup_empty_realms()
239 		spin_unlock(&mdsc->snap_empty_lock);  in __cleanup_empty_realms()
240 		__destroy_snap_realm(mdsc, realm);  in __cleanup_empty_realms()
241 		spin_lock(&mdsc->snap_empty_lock);  in __cleanup_empty_realms()
243 	spin_unlock(&mdsc->snap_empty_lock);  in __cleanup_empty_realms()
246 void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc)  in ceph_cleanup_empty_realms()  argument
248 	down_write(&mdsc->snap_rwsem);  in ceph_cleanup_empty_realms()
249 	__cleanup_empty_realms(mdsc);  in ceph_cleanup_empty_realms()
250 	up_write(&mdsc->snap_rwsem);  in ceph_cleanup_empty_realms()
261 static int adjust_snap_realm_parent(struct ceph_mds_client *mdsc,  in adjust_snap_realm_parent()  argument
270 	parent = ceph_lookup_snap_realm(mdsc, parentino);  in adjust_snap_realm_parent()
272 		parent = ceph_create_snap_realm(mdsc, parentino);  in adjust_snap_realm_parent()
281 		ceph_put_snap_realm(mdsc, realm->parent);  in adjust_snap_realm_parent()
593 	struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;  in __ceph_finish_cap_snap()  local
618 	spin_lock(&mdsc->snap_flush_lock);  in __ceph_finish_cap_snap()
619 	list_add_tail(&ci->i_snap_flush_item, &mdsc->snap_flush_list);  in __ceph_finish_cap_snap()
620 	spin_unlock(&mdsc->snap_flush_lock);  in __ceph_finish_cap_snap()
659 int ceph_update_snap_trace(struct ceph_mds_client *mdsc,  in ceph_update_snap_trace()  argument
684 	realm = ceph_lookup_snap_realm(mdsc, le64_to_cpu(ri->ino));  in ceph_update_snap_trace()
686 		realm = ceph_create_snap_realm(mdsc, le64_to_cpu(ri->ino));  in ceph_update_snap_trace()
694 	err = adjust_snap_realm_parent(mdsc, realm, le64_to_cpu(ri->parent));  in ceph_update_snap_trace()
719 		if (realm->seq > mdsc->last_snap_seq)  in ceph_update_snap_trace()
720 			mdsc->last_snap_seq = realm->seq;  in ceph_update_snap_trace()
742 		ceph_put_snap_realm(mdsc, realm);  in ceph_update_snap_trace()
761 		ceph_put_snap_realm(mdsc, first_realm);  in ceph_update_snap_trace()
763 	__cleanup_empty_realms(mdsc);  in ceph_update_snap_trace()
770 		ceph_put_snap_realm(mdsc, realm);  in ceph_update_snap_trace()
772 		ceph_put_snap_realm(mdsc, first_realm);  in ceph_update_snap_trace()
784 static void flush_snaps(struct ceph_mds_client *mdsc)  in flush_snaps()  argument
791 	spin_lock(&mdsc->snap_flush_lock);  in flush_snaps()
792 	while (!list_empty(&mdsc->snap_flush_list)) {  in flush_snaps()
793 		ci = list_first_entry(&mdsc->snap_flush_list,  in flush_snaps()
797 		spin_unlock(&mdsc->snap_flush_lock);  in flush_snaps()
800 		spin_lock(&mdsc->snap_flush_lock);  in flush_snaps()
802 	spin_unlock(&mdsc->snap_flush_lock);  in flush_snaps()
823 void ceph_handle_snap(struct ceph_mds_client *mdsc,  in ceph_handle_snap()  argument
827 	struct super_block *sb = mdsc->fsc->sb;  in ceph_handle_snap()
860 	down_write(&mdsc->snap_rwsem);  in ceph_handle_snap()
882 		realm = ceph_lookup_snap_realm(mdsc, split);  in ceph_handle_snap()
884 			realm = ceph_create_snap_realm(mdsc, split);  in ceph_handle_snap()
940 			ceph_get_snap_realm(mdsc, realm);  in ceph_handle_snap()
941 			ceph_put_snap_realm(mdsc, oldrealm);  in ceph_handle_snap()
954 				__lookup_snap_realm(mdsc,  in ceph_handle_snap()
958 			adjust_snap_realm_parent(mdsc, child, realm->ino);  in ceph_handle_snap()
966 	ceph_update_snap_trace(mdsc, p, e,  in ceph_handle_snap()
971 		ceph_put_snap_realm(mdsc, realm);  in ceph_handle_snap()
973 	__cleanup_empty_realms(mdsc);  in ceph_handle_snap()
975 	up_write(&mdsc->snap_rwsem);  in ceph_handle_snap()
977 	flush_snaps(mdsc);  in ceph_handle_snap()
985 		up_write(&mdsc->snap_rwsem);  in ceph_handle_snap()