* GPL HEADER END
*/
/*
- * Copyright 2008 Sun Microsystems, Inc. All rights reserved
+ * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*/
/*
* lustre/ptlrpc/ptlrpcd.c
*/
+/** \defgroup ptlrpcd PortalRPC daemon
+ *
+ * ptlrpcd is a special thread with its own set where other user might add
+ * requests when they don't want to wait for their completion.
+ * PtlRPCD will take care of sending such requests and then processing their
+ * replies and calling completion callbacks as necessary.
+ * The callbacks are called directly from ptlrpcd context.
+ * It is important to never significantly block (esp. on RPCs!) within such
+ * completion handler or a deadlock might occur where ptlrpcd enters some
+ * callback that attempts to send another RPC and wait for it to return,
+ * during which time ptlrpcd is completely blocked, so e.g. if import
+ * fails, recovery cannot progress because connection requests are also
+ * sent by ptlrpcd.
+ *
+ * @{
+ */
+
#define DEBUG_SUBSYSTEM S_RPC
#ifdef __KERNEL__
}
};
-struct semaphore ptlrpcd_sem;
+cfs_semaphore_t ptlrpcd_sem;
static int ptlrpcd_users = 0;
void ptlrpcd_wake(struct ptlrpc_request *req)
cfs_waitq_signal(&rq_set->set_waitq);
}
-/*
+/**
* Move all request from an existing request set to the ptlrpcd queue.
* All requests from the set must be in phase RQ_PHASE_NEW.
*/
void ptlrpcd_add_rqset(struct ptlrpc_request_set *set)
{
- struct list_head *tmp, *pos;
+ cfs_list_t *tmp, *pos;
- list_for_each_safe(pos, tmp, &set->set_requests) {
+ cfs_list_for_each_safe(pos, tmp, &set->set_requests) {
struct ptlrpc_request *req =
- list_entry(pos, struct ptlrpc_request, rq_set_chain);
+ cfs_list_entry(pos, struct ptlrpc_request,
+ rq_set_chain);
LASSERT(req->rq_phase == RQ_PHASE_NEW);
- list_del_init(&req->rq_set_chain);
+ cfs_list_del_init(&req->rq_set_chain);
req->rq_set = NULL;
ptlrpcd_add_req(req, PSCOPE_OTHER);
- set->set_remaining--;
+ cfs_atomic_dec(&set->set_remaining);
}
- LASSERT(set->set_remaining == 0);
+ LASSERT(cfs_atomic_read(&set->set_remaining) == 0);
}
EXPORT_SYMBOL(ptlrpcd_add_rqset);
-/*
+/**
* Requests that are added to the ptlrpcd queue are sent via
* ptlrpcd_check->ptlrpc_check_set().
*/
int rc;
LASSERT(scope < PSCOPE_NR);
+
+ cfs_spin_lock(&req->rq_lock);
+ if (req->rq_invalid_rqset) {
+ cfs_duration_t timeout;
+ struct l_wait_info lwi;
+
+ req->rq_invalid_rqset = 0;
+ cfs_spin_unlock(&req->rq_lock);
+
+ timeout = cfs_time_seconds(5);
+ lwi = LWI_TIMEOUT(timeout, back_to_sleep, NULL);
+ l_wait_event(req->rq_set_waitq, (req->rq_set == NULL), &lwi);
+ } else if (req->rq_set) {
+ LASSERT(req->rq_phase == RQ_PHASE_NEW);
+ LASSERT(req->rq_send_state == LUSTRE_IMP_REPLAY);
+
+ /* ptlrpc_check_set will decrease the count */
+ cfs_atomic_inc(&req->rq_set->set_remaining);
+ cfs_spin_unlock(&req->rq_lock);
+
+ cfs_waitq_signal(&req->rq_set->set_waitq);
+ } else {
+ cfs_spin_unlock(&req->rq_lock);
+ }
+
pt = req->rq_send_state == LUSTRE_IMP_FULL ? PT_NORMAL : PT_RECOVERY;
pc = &ptlrpcd_scopes[scope].pscope_thread[pt].pt_ctl;
rc = ptlrpc_set_add_new_req(pc, req);
/*
* XXX disable this for CLIO: environment is needed for interpreter.
+ * add debug temporary to check rc.
*/
+ LASSERTF(rc == 0, "ptlrpcd_add_req failed (rc = %d)\n", rc);
if (rc && 0) {
- ptlrpc_interpterer_t interpreter;
-
- interpreter = req->rq_interpret_reply;
-
/*
* Thread is probably in stop now so we need to
* kill this rpc as it was not added. Let's call
* interpret for it to let know we're killing it
- * so that higher levels might free assosiated
+ * so that higher levels might free associated
* resources.
*/
ptlrpc_req_interpret(NULL, req, -EBADR);
req->rq_set = NULL;
ptlrpc_req_finished(req);
+ } else if (req->rq_send_state == LUSTRE_IMP_CONNECTING) {
+ /*
+ * The request is for recovery, should be sent ASAP.
+ */
+ cfs_waitq_signal(&pc->pc_set->set_waitq);
}
return rc;
}
+/**
+ * Check if there is more work to do on ptlrpcd set.
+ * Returns 1 if yes.
+ */
static int ptlrpcd_check(const struct lu_env *env, struct ptlrpcd_ctl *pc)
{
- struct list_head *tmp, *pos;
+ cfs_list_t *tmp, *pos;
struct ptlrpc_request *req;
int rc = 0;
ENTRY;
- spin_lock(&pc->pc_set->set_new_req_lock);
- list_for_each_safe(pos, tmp, &pc->pc_set->set_new_requests) {
- req = list_entry(pos, struct ptlrpc_request, rq_set_chain);
- list_del_init(&req->rq_set_chain);
+ cfs_spin_lock(&pc->pc_set->set_new_req_lock);
+ cfs_list_for_each_safe(pos, tmp, &pc->pc_set->set_new_requests) {
+ req = cfs_list_entry(pos, struct ptlrpc_request, rq_set_chain);
+ cfs_list_del_init(&req->rq_set_chain);
ptlrpc_set_add_req(pc->pc_set, req);
/*
* Need to calculate its timeout.
*/
rc = 1;
}
- spin_unlock(&pc->pc_set->set_new_req_lock);
+ cfs_spin_unlock(&pc->pc_set->set_new_req_lock);
- if (pc->pc_set->set_remaining) {
+ if (cfs_atomic_read(&pc->pc_set->set_remaining)) {
rc = rc | ptlrpc_check_set(env, pc->pc_set);
/*
* XXX: our set never completes, so we prune the completed
* reqs after each iteration. boy could this be smarter.
*/
- list_for_each_safe(pos, tmp, &pc->pc_set->set_requests) {
- req = list_entry(pos, struct ptlrpc_request,
+ cfs_list_for_each_safe(pos, tmp, &pc->pc_set->set_requests) {
+ req = cfs_list_entry(pos, struct ptlrpc_request,
rq_set_chain);
if (req->rq_phase != RQ_PHASE_COMPLETE)
continue;
- list_del_init(&req->rq_set_chain);
+ cfs_list_del_init(&req->rq_set_chain);
req->rq_set = NULL;
ptlrpc_req_finished (req);
}
/*
* If new requests have been added, make sure to wake up.
*/
- spin_lock(&pc->pc_set->set_new_req_lock);
- rc = !list_empty(&pc->pc_set->set_new_requests);
- spin_unlock(&pc->pc_set->set_new_req_lock);
+ cfs_spin_lock(&pc->pc_set->set_new_req_lock);
+ rc = !cfs_list_empty(&pc->pc_set->set_new_requests);
+ cfs_spin_unlock(&pc->pc_set->set_new_req_lock);
}
RETURN(rc);
}
#ifdef __KERNEL__
-/*
+/**
+ * Main ptlrpcd thread.
* ptlrpc's code paths like to execute in process context, so we have this
- * thread which spins on a set which contains the io rpcs. llite specifies
- * ptlrpcd's set when it pushes pages down into the oscs.
+ * thread which spins on a set which contains the rpcs and sends them.
+ *
*/
static int ptlrpcd(void *arg)
{
LCT_CL_THREAD|LCT_REMEMBER|LCT_NOREF);
}
- complete(&pc->pc_starting);
+ cfs_complete(&pc->pc_starting);
if (rc != 0)
RETURN(rc);
/*
* Abort inflight rpcs for forced stop case.
*/
- if (test_bit(LIOD_STOP, &pc->pc_flags)) {
- if (test_bit(LIOD_FORCE, &pc->pc_flags))
+ if (cfs_test_bit(LIOD_STOP, &pc->pc_flags)) {
+ if (cfs_test_bit(LIOD_FORCE, &pc->pc_flags))
ptlrpc_abort_set(pc->pc_set);
exit++;
}
/*
* Wait for inflight requests to drain.
*/
- if (!list_empty(&pc->pc_set->set_requests))
+ if (!cfs_list_empty(&pc->pc_set->set_requests))
ptlrpc_set_wait(pc->pc_set);
lu_context_fini(&env.le_ctx);
- complete(&pc->pc_finishing);
+ cfs_complete(&pc->pc_finishing);
- clear_bit(LIOD_START, &pc->pc_flags);
- clear_bit(LIOD_STOP, &pc->pc_flags);
- clear_bit(LIOD_FORCE, &pc->pc_flags);
+ cfs_clear_bit(LIOD_START, &pc->pc_flags);
+ cfs_clear_bit(LIOD_STOP, &pc->pc_flags);
+ cfs_clear_bit(LIOD_FORCE, &pc->pc_flags);
return 0;
}
#else /* !__KERNEL__ */
+/**
+ * In liblustre we do not have separate threads, so this function
+ * is called from time to time all across common code to see
+ * if something needs to be processed on ptlrpcd set.
+ */
int ptlrpcd_check_async_rpcs(void *arg)
{
struct ptlrpcd_ctl *pc = arg;
/*
* XXX: send replay requests.
*/
- if (test_bit(LIOD_RECOVERY, &pc->pc_flags))
+ if (cfs_test_bit(LIOD_RECOVERY, &pc->pc_flags))
rc = ptlrpcd_check(&pc->pc_env, pc);
}
}
{
struct ptlrpcd_ctl *pc = arg;
- return (list_empty(&pc->pc_set->set_new_requests) &&
- pc->pc_set->set_remaining == 0);
+ return (cfs_list_empty(&pc->pc_set->set_new_requests) &&
+ cfs_atomic_read(&pc->pc_set->set_remaining) == 0);
}
#endif
/*
* Do not allow start second thread for one pc.
*/
- if (test_and_set_bit(LIOD_START, &pc->pc_flags)) {
+ if (cfs_test_and_set_bit(LIOD_START, &pc->pc_flags)) {
CERROR("Starting second thread (%s) for same pc %p\n",
name, pc);
RETURN(-EALREADY);
}
- init_completion(&pc->pc_starting);
- init_completion(&pc->pc_finishing);
- spin_lock_init(&pc->pc_lock);
- snprintf (pc->pc_name, sizeof (pc->pc_name), name);
+ cfs_init_completion(&pc->pc_starting);
+ cfs_init_completion(&pc->pc_finishing);
+ cfs_spin_lock_init(&pc->pc_lock);
+ strncpy(pc->pc_name, name, sizeof(pc->pc_name) - 1);
pc->pc_set = ptlrpc_prep_set();
if (pc->pc_set == NULL)
GOTO(out, rc = -ENOMEM);
GOTO(out, rc);
}
rc = 0;
- wait_for_completion(&pc->pc_starting);
+ cfs_wait_for_completion(&pc->pc_starting);
#else
pc->pc_wait_callback =
liblustre_register_wait_callback("ptlrpcd_check_async_rpcs",
#endif
out:
if (rc)
- clear_bit(LIOD_START, &pc->pc_flags);
+ cfs_clear_bit(LIOD_START, &pc->pc_flags);
RETURN(rc);
}
void ptlrpcd_stop(struct ptlrpcd_ctl *pc, int force)
{
- if (!test_bit(LIOD_START, &pc->pc_flags)) {
+ if (!cfs_test_bit(LIOD_START, &pc->pc_flags)) {
CERROR("Thread for pc %p was not started\n", pc);
return;
}
- set_bit(LIOD_STOP, &pc->pc_flags);
+ cfs_set_bit(LIOD_STOP, &pc->pc_flags);
if (force)
- set_bit(LIOD_FORCE, &pc->pc_flags);
+ cfs_set_bit(LIOD_FORCE, &pc->pc_flags);
cfs_waitq_signal(&pc->pc_set->set_waitq);
#ifdef __KERNEL__
- wait_for_completion(&pc->pc_finishing);
+ cfs_wait_for_completion(&pc->pc_finishing);
#else
liblustre_deregister_wait_callback(pc->pc_wait_callback);
liblustre_deregister_idle_callback(pc->pc_idle_callback);
pc = &ptlrpcd_scopes[i].pscope_thread[j].pt_ctl;
- if (test_bit(LIOD_START, &pc->pc_flags))
+ if (cfs_test_bit(LIOD_START, &pc->pc_flags))
ptlrpcd_stop(pc, 0);
}
}
int j;
ENTRY;
- mutex_down(&ptlrpcd_sem);
+ cfs_mutex_down(&ptlrpcd_sem);
if (++ptlrpcd_users == 1) {
for (i = 0; rc == 0 && i < PSCOPE_NR; ++i) {
for (j = 0; rc == 0 && j < PT_NR; ++j) {
pt = &ptlrpcd_scopes[i].pscope_thread[j];
pc = &pt->pt_ctl;
if (j == PT_RECOVERY)
- set_bit(LIOD_RECOVERY, &pc->pc_flags);
+ cfs_set_bit(LIOD_RECOVERY, &pc->pc_flags);
rc = ptlrpcd_start(pt->pt_name, pc);
}
}
ptlrpcd_fini();
}
}
- mutex_up(&ptlrpcd_sem);
+ cfs_mutex_up(&ptlrpcd_sem);
RETURN(rc);
}
void ptlrpcd_decref(void)
{
- mutex_down(&ptlrpcd_sem);
+ cfs_mutex_down(&ptlrpcd_sem);
if (--ptlrpcd_users == 0)
ptlrpcd_fini();
- mutex_up(&ptlrpcd_sem);
+ cfs_mutex_up(&ptlrpcd_sem);
}
+/** @} ptlrpcd */
git://git.whamcloud.com / fs / lustre-release.git / blobdiff