62 void ceph_get_snap_realm(struct ceph_mds_client *mdsc,  in ceph_get_snap_realm()  argument
74 		spin_lock(&mdsc->snap_empty_lock);  in ceph_get_snap_realm()
76 		spin_unlock(&mdsc->snap_empty_lock);  in ceph_get_snap_realm()
108 	struct ceph_mds_client *mdsc,  in ceph_create_snap_realm()  argument
125 	__insert_snap_realm(&mdsc->snap_realms, realm);  in ceph_create_snap_realm()
135 static struct ceph_snap_realm *__lookup_snap_realm(struct ceph_mds_client *mdsc,  in __lookup_snap_realm()  argument
138 	struct rb_node *n = mdsc->snap_realms.rb_node;  in __lookup_snap_realm()
155 struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc,  in ceph_lookup_snap_realm()  argument
159 	r = __lookup_snap_realm(mdsc, ino);  in ceph_lookup_snap_realm()
161 		ceph_get_snap_realm(mdsc, r);  in ceph_lookup_snap_realm()
165 static void __put_snap_realm(struct ceph_mds_client *mdsc,
171 static void __destroy_snap_realm(struct ceph_mds_client *mdsc,  in __destroy_snap_realm()  argument
176 	rb_erase(&realm->node, &mdsc->snap_realms);  in __destroy_snap_realm()
180 		__put_snap_realm(mdsc, realm->parent);  in __destroy_snap_realm()
192 static void __put_snap_realm(struct ceph_mds_client *mdsc,  in __put_snap_realm()  argument
198 		__destroy_snap_realm(mdsc, realm);  in __put_snap_realm()
204 void ceph_put_snap_realm(struct ceph_mds_client *mdsc,  in ceph_put_snap_realm()  argument
212 	if (down_write_trylock(&mdsc->snap_rwsem)) {  in ceph_put_snap_realm()
213 		__destroy_snap_realm(mdsc, realm);  in ceph_put_snap_realm()
214 		up_write(&mdsc->snap_rwsem);  in ceph_put_snap_realm()
216 		spin_lock(&mdsc->snap_empty_lock);  in ceph_put_snap_realm()
217 		list_add(&realm->empty_item, &mdsc->snap_empty);  in ceph_put_snap_realm()
218 		spin_unlock(&mdsc->snap_empty_lock);  in ceph_put_snap_realm()
229 static void __cleanup_empty_realms(struct ceph_mds_client *mdsc)  in __cleanup_empty_realms()  argument
233 	spin_lock(&mdsc->snap_empty_lock);  in __cleanup_empty_realms()
234 	while (!list_empty(&mdsc->snap_empty)) {  in __cleanup_empty_realms()
235 		realm = list_first_entry(&mdsc->snap_empty,  in __cleanup_empty_realms()
238 		spin_unlock(&mdsc->snap_empty_lock);  in __cleanup_empty_realms()
239 		__destroy_snap_realm(mdsc, realm);  in __cleanup_empty_realms()
240 		spin_lock(&mdsc->snap_empty_lock);  in __cleanup_empty_realms()
242 	spin_unlock(&mdsc->snap_empty_lock);  in __cleanup_empty_realms()
245 void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc)  in ceph_cleanup_empty_realms()  argument
247 	down_write(&mdsc->snap_rwsem);  in ceph_cleanup_empty_realms()
248 	__cleanup_empty_realms(mdsc);  in ceph_cleanup_empty_realms()
249 	up_write(&mdsc->snap_rwsem);  in ceph_cleanup_empty_realms()
260 static int adjust_snap_realm_parent(struct ceph_mds_client *mdsc,  in adjust_snap_realm_parent()  argument
269 	parent = ceph_lookup_snap_realm(mdsc, parentino);  in adjust_snap_realm_parent()
271 		parent = ceph_create_snap_realm(mdsc, parentino);  in adjust_snap_realm_parent()
280 		ceph_put_snap_realm(mdsc, realm->parent);  in adjust_snap_realm_parent()
568 	struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;  in __ceph_finish_cap_snap()  local
589 	spin_lock(&mdsc->snap_flush_lock);  in __ceph_finish_cap_snap()
590 	list_add_tail(&ci->i_snap_flush_item, &mdsc->snap_flush_list);  in __ceph_finish_cap_snap()
591 	spin_unlock(&mdsc->snap_flush_lock);  in __ceph_finish_cap_snap()
640 int ceph_update_snap_trace(struct ceph_mds_client *mdsc,  in ceph_update_snap_trace()  argument
665 	realm = ceph_lookup_snap_realm(mdsc, le64_to_cpu(ri->ino));  in ceph_update_snap_trace()
667 		realm = ceph_create_snap_realm(mdsc, le64_to_cpu(ri->ino));  in ceph_update_snap_trace()
675 	err = adjust_snap_realm_parent(mdsc, realm, le64_to_cpu(ri->parent));  in ceph_update_snap_trace()
723 		ceph_put_snap_realm(mdsc, realm);  in ceph_update_snap_trace()
741 		ceph_put_snap_realm(mdsc, first_realm);  in ceph_update_snap_trace()
743 	__cleanup_empty_realms(mdsc);  in ceph_update_snap_trace()
750 		ceph_put_snap_realm(mdsc, realm);  in ceph_update_snap_trace()
752 		ceph_put_snap_realm(mdsc, first_realm);  in ceph_update_snap_trace()
764 static void flush_snaps(struct ceph_mds_client *mdsc)  in flush_snaps()  argument
771 	spin_lock(&mdsc->snap_flush_lock);  in flush_snaps()
772 	while (!list_empty(&mdsc->snap_flush_list)) {  in flush_snaps()
773 		ci = list_first_entry(&mdsc->snap_flush_list,  in flush_snaps()
777 		spin_unlock(&mdsc->snap_flush_lock);  in flush_snaps()
782 		spin_lock(&mdsc->snap_flush_lock);  in flush_snaps()
784 	spin_unlock(&mdsc->snap_flush_lock);  in flush_snaps()
805 void ceph_handle_snap(struct ceph_mds_client *mdsc,  in ceph_handle_snap()  argument
809 	struct super_block *sb = mdsc->fsc->sb;  in ceph_handle_snap()
842 	down_write(&mdsc->snap_rwsem);  in ceph_handle_snap()
864 		realm = ceph_lookup_snap_realm(mdsc, split);  in ceph_handle_snap()
866 			realm = ceph_create_snap_realm(mdsc, split);  in ceph_handle_snap()
916 			ceph_get_snap_realm(mdsc, realm);  in ceph_handle_snap()
917 			ceph_put_snap_realm(mdsc, oldrealm);  in ceph_handle_snap()
930 				__lookup_snap_realm(mdsc,  in ceph_handle_snap()
934 			adjust_snap_realm_parent(mdsc, child, realm->ino);  in ceph_handle_snap()
942 	ceph_update_snap_trace(mdsc, p, e,  in ceph_handle_snap()
947 		ceph_put_snap_realm(mdsc, realm);  in ceph_handle_snap()
949 	__cleanup_empty_realms(mdsc);  in ceph_handle_snap()
951 	up_write(&mdsc->snap_rwsem);  in ceph_handle_snap()
953 	flush_snaps(mdsc);  in ceph_handle_snap()
961 		up_write(&mdsc->snap_rwsem);  in ceph_handle_snap()