with a deadlk here, we'd have to generate something like grant_lock with
the deadlk error.) */
-/* returns the highest requested mode of all blocked conversions */
+/* Returns the highest requested mode of all blocked conversions; sets
+ cw if there's a blocked conversion to DLM_LOCK_CW. */
-static int grant_pending_convert(struct dlm_rsb *r, int high)
+static int grant_pending_convert(struct dlm_rsb *r, int high, int *cw)
{
struct dlm_lkb *lkb, *s;
int hi, demoted, quit, grant_restart, demote_restart;
}
hi = max_t(int, lkb->lkb_rqmode, hi);
+
+ if (cw && lkb->lkb_rqmode == DLM_LOCK_CW)
+ *cw = 1;
}
if (grant_restart)
return max_t(int, high, hi);
}
-static int grant_pending_wait(struct dlm_rsb *r, int high)
+static int grant_pending_wait(struct dlm_rsb *r, int high, int *cw)
{
struct dlm_lkb *lkb, *s;
list_for_each_entry_safe(lkb, s, &r->res_waitqueue, lkb_statequeue) {
if (can_be_granted(r, lkb, 0, NULL))
grant_lock_pending(r, lkb);
- else
+ else {
high = max_t(int, lkb->lkb_rqmode, high);
+ if (lkb->lkb_rqmode == DLM_LOCK_CW)
+ *cw = 1;
+ }
}
return high;
}
+/* cw of 1 means there's a lock with a rqmode of DLM_LOCK_CW that's blocked
+ on either the convert or waiting queue.
+ high is the largest rqmode of all locks blocked on the convert or
+ waiting queue. */
+
+static int lock_requires_bast(struct dlm_lkb *gr, int high, int cw)
+{
+ if (gr->lkb_grmode == DLM_LOCK_PR && cw) {
+ if (gr->lkb_highbast < DLM_LOCK_EX)
+ return 1;
+ return 0;
+ }
+
+ if (gr->lkb_highbast < high &&
+ !__dlm_compat_matrix[gr->lkb_grmode+1][high+1])
+ return 1;
+ return 0;
+}
+
static void grant_pending_locks(struct dlm_rsb *r)
{
struct dlm_lkb *lkb, *s;
int high = DLM_LOCK_IV;
+ int cw = 0;
DLM_ASSERT(is_master(r), dlm_dump_rsb(r););
- high = grant_pending_convert(r, high);
- high = grant_pending_wait(r, high);
+ high = grant_pending_convert(r, high, &cw);
+ high = grant_pending_wait(r, high, &cw);
if (high == DLM_LOCK_IV)
return;
/*
* If there are locks left on the wait/convert queue then send blocking
* ASTs to granted locks based on the largest requested mode (high)
- * found above. FIXME: highbast < high comparison not valid for PR/CW.
+ * found above.
*/
list_for_each_entry_safe(lkb, s, &r->res_grantqueue, lkb_statequeue) {
- if (lkb->lkb_bastaddr && (lkb->lkb_highbast < high) &&
- !__dlm_compat_matrix[lkb->lkb_grmode+1][high+1]) {
- queue_bast(r, lkb, high);
+ if (lkb->lkb_bastaddr && lock_requires_bast(lkb, high, cw)) {
+ if (cw && high == DLM_LOCK_PR)
+ queue_bast(r, lkb, DLM_LOCK_CW);
+ else
+ queue_bast(r, lkb, high);
lkb->lkb_highbast = high;
}
}
}
+static int modes_require_bast(struct dlm_lkb *gr, struct dlm_lkb *rq)
+{
+ if ((gr->lkb_grmode == DLM_LOCK_PR && rq->lkb_rqmode == DLM_LOCK_CW) ||
+ (gr->lkb_grmode == DLM_LOCK_CW && rq->lkb_rqmode == DLM_LOCK_PR)) {
+ if (gr->lkb_highbast < DLM_LOCK_EX)
+ return 1;
+ return 0;
+ }
+
+ if (gr->lkb_highbast < rq->lkb_rqmode && !modes_compat(gr, rq))
+ return 1;
+ return 0;
+}
+
static void send_bast_queue(struct dlm_rsb *r, struct list_head *head,
struct dlm_lkb *lkb)
{
struct dlm_lkb *gr;
list_for_each_entry(gr, head, lkb_statequeue) {
- if (gr->lkb_bastaddr &&
- gr->lkb_highbast < lkb->lkb_rqmode &&
- !modes_compat(gr, lkb)) {
+ if (gr->lkb_bastaddr && modes_require_bast(gr, lkb)) {
queue_bast(r, gr, lkb->lkb_rqmode);
gr->lkb_highbast = lkb->lkb_rqmode;
}
before we try again to grant this one. */
if (is_demoted(lkb)) {
- grant_pending_convert(r, DLM_LOCK_IV);
+ grant_pending_convert(r, DLM_LOCK_IV, NULL);
if (_can_be_granted(r, lkb, 1)) {
grant_lock(r, lkb);
queue_cast(r, lkb, 0);
dlm_put_lkb(lkb);
}
-int dlm_receive_message(struct dlm_header *hd, int nodeid, int recovery)
+static void _receive_message(struct dlm_ls *ls, struct dlm_message *ms)
{
- struct dlm_message *ms = (struct dlm_message *) hd;
- struct dlm_ls *ls;
- int error = 0;
-
- if (!recovery)
- dlm_message_in(ms);
-
- ls = dlm_find_lockspace_global(hd->h_lockspace);
- if (!ls) {
- log_print("drop message %d from %d for unknown lockspace %d",
- ms->m_type, nodeid, hd->h_lockspace);
- return -EINVAL;
- }
-
- /* recovery may have just ended leaving a bunch of backed-up requests
- in the requestqueue; wait while dlm_recoverd clears them */
-
- if (!recovery)
- dlm_wait_requestqueue(ls);
-
- /* recovery may have just started while there were a bunch of
- in-flight requests -- save them in requestqueue to be processed
- after recovery. we can't let dlm_recvd block on the recovery
- lock. if dlm_recoverd is calling this function to clear the
- requestqueue, it needs to be interrupted (-EINTR) if another
- recovery operation is starting. */
-
- while (1) {
- if (dlm_locking_stopped(ls)) {
- if (recovery) {
- error = -EINTR;
- goto out;
- }
- error = dlm_add_requestqueue(ls, nodeid, hd);
- if (error == -EAGAIN)
- continue;
- else {
- error = -EINTR;
- goto out;
- }
- }
-
- if (dlm_lock_recovery_try(ls))
- break;
- schedule();
- }
-
switch (ms->m_type) {
/* messages sent to a master node */
log_error(ls, "unknown message type %d", ms->m_type);
}
- dlm_unlock_recovery(ls);
- out:
- dlm_put_lockspace(ls);
dlm_astd_wake();
- return error;
}
+/* If the lockspace is in recovery mode (locking stopped), then normal
+ messages are saved on the requestqueue for processing after recovery is
+ done. When not in recovery mode, we wait for dlm_recoverd to drain saved
+ messages off the requestqueue before we process new ones. This occurs right
+ after recovery completes when we transition from saving all messages on
+ requestqueue, to processing all the saved messages, to processing new
+ messages as they arrive. */
-/*
- * Recovery related
- */
+static void dlm_receive_message(struct dlm_ls *ls, struct dlm_message *ms,
+ int nodeid)
+{
+ if (dlm_locking_stopped(ls)) {
+ dlm_add_requestqueue(ls, nodeid, (struct dlm_header *) ms);
+ } else {
+ dlm_wait_requestqueue(ls);
+ _receive_message(ls, ms);
+ }
+}
+
+/* This is called by dlm_recoverd to process messages that were saved on
+ the requestqueue. */
+
+void dlm_receive_message_saved(struct dlm_ls *ls, struct dlm_message *ms)
+{
+ _receive_message(ls, ms);
+}
+
+/* This is called by the midcomms layer when something is received for
+ the lockspace. It could be either a MSG (normal message sent as part of
+ standard locking activity) or an RCOM (recovery message sent as part of
+ lockspace recovery). */
+
+void dlm_receive_buffer(struct dlm_header *hd, int nodeid)
+{
+ struct dlm_message *ms = (struct dlm_message *) hd;
+ struct dlm_rcom *rc = (struct dlm_rcom *) hd;
+ struct dlm_ls *ls;
+ int type = 0;
+
+ switch (hd->h_cmd) {
+ case DLM_MSG:
+ dlm_message_in(ms);
+ type = ms->m_type;
+ break;
+ case DLM_RCOM:
+ dlm_rcom_in(rc);
+ type = rc->rc_type;
+ break;
+ default:
+ log_print("invalid h_cmd %d from %u", hd->h_cmd, nodeid);
+ return;
+ }
+
+ if (hd->h_nodeid != nodeid) {
+ log_print("invalid h_nodeid %d from %d lockspace %x",
+ hd->h_nodeid, nodeid, hd->h_lockspace);
+ return;
+ }
+
+ ls = dlm_find_lockspace_global(hd->h_lockspace);
+ if (!ls) {
+ log_print("invalid h_lockspace %x from %d cmd %d type %d",
+ hd->h_lockspace, nodeid, hd->h_cmd, type);
+
+ if (hd->h_cmd == DLM_RCOM && type == DLM_RCOM_STATUS)
+ dlm_send_ls_not_ready(nodeid, rc);
+ return;
+ }
+
+ /* this rwsem allows dlm_ls_stop() to wait for all dlm_recv threads to
+ be inactive (in this ls) before transitioning to recovery mode */
+
+ down_read(&ls->ls_recv_active);
+ if (hd->h_cmd == DLM_MSG)
+ dlm_receive_message(ls, ms, nodeid);
+ else
+ dlm_receive_rcom(ls, rc, nodeid);
+ up_read(&ls->ls_recv_active);
+
+ dlm_put_lockspace(ls);
+}
static void recover_convert_waiter(struct dlm_ls *ls, struct dlm_lkb *lkb)
{
if (lvb_in && ua->lksb.sb_lvbptr)
memcpy(ua->lksb.sb_lvbptr, lvb_in, DLM_USER_LVB_LEN);
- ua->castparam = ua_tmp->castparam;
+ if (ua_tmp->castparam)
+ ua->castparam = ua_tmp->castparam;
ua->user_lksb = ua_tmp->user_lksb;
error = set_unlock_args(flags, ua, &args);
goto out;
ua = (struct dlm_user_args *)lkb->lkb_astparam;
- ua->castparam = ua_tmp->castparam;
+ if (ua_tmp->castparam)
+ ua->castparam = ua_tmp->castparam;
ua->user_lksb = ua_tmp->user_lksb;
error = set_unlock_args(flags, ua, &args);
projects / linux-2.6-omap-h63xx.git / blobdiff