+
+#define GROUPLOCK_SCOPE "grouplock"
+
+int cl_get_grouplock(struct cl_object *obj, unsigned long gid, int nonblock,
+ struct ccc_grouplock *cg)
+{
+ struct lu_env *env;
+ struct cl_io *io;
+ struct cl_lock *lock;
+ struct cl_lock_descr *descr;
+ __u32 enqflags;
+ int refcheck;
+ int rc;
+
+ env = cl_env_get(&refcheck);
+ if (IS_ERR(env))
+ return PTR_ERR(env);
+
+ io = &ccc_env_info(env)->cti_io;
+ io->ci_obj = obj;
+
+ rc = cl_io_init(env, io, CIT_MISC, io->ci_obj);
+ if (rc) {
+ LASSERT(rc < 0);
+ cl_env_put(env, &refcheck);
+ return rc;
+ }
+
+ descr = &ccc_env_info(env)->cti_descr;
+ descr->cld_obj = obj;
+ descr->cld_start = 0;
+ descr->cld_end = CL_PAGE_EOF;
+ descr->cld_gid = gid;
+ descr->cld_mode = CLM_GROUP;
+
+ enqflags = CEF_MUST | (nonblock ? CEF_NONBLOCK : 0);
+ lock = cl_lock_request(env, io, descr, enqflags,
+ GROUPLOCK_SCOPE, cfs_current());
+ if (IS_ERR(lock)) {
+ cl_io_fini(env, io);
+ cl_env_put(env, &refcheck);
+ return PTR_ERR(lock);
+ }
+
+ cg->cg_env = cl_env_get(&refcheck);
+ cg->cg_lock = lock;
+ cg->cg_gid = gid;
+ LASSERT(cg->cg_env == env);
+
+ cl_env_unplant(env, &refcheck);
+ return 0;
+}
+
+void cl_put_grouplock(struct ccc_grouplock *cg)
+{
+ struct lu_env *env = cg->cg_env;
+ struct cl_lock *lock = cg->cg_lock;
+ int refcheck;
+
+ LASSERT(cg->cg_env);
+ LASSERT(cg->cg_gid);
+
+ cl_env_implant(env, &refcheck);
+ cl_env_put(env, &refcheck);
+
+ cl_unuse(env, lock);
+ cl_lock_release(env, lock, GROUPLOCK_SCOPE, cfs_current());
+ cl_io_fini(env, &ccc_env_info(env)->cti_io);
+ cl_env_put(env, NULL);
+}
+