Commit 2a7ce0ed authored by David Teigland's avatar David Teigland
Browse files

dlm: remove shared message stub for recovery 



kmalloc a stub message struct during recovery instead of sharing the
struct in the lockspace.  This leaves the lockspace stub_ms only for
faking downconvert replies, where it is never modified and sharing
is not a problem.

Also improve the debug messages in the same recovery function.

Signed-off-by: default avatarDavid Teigland <teigland@redhat.com>
parent c6ff669b

fs/dlm/dlm_internal.h

+1 −0
Original line number Diff line number Diff line
@@ -209,6 +209,7 @@ struct dlm_args { 
#define DLM_IFL_WATCH_TIMEWARN	0x00400000

#define DLM_IFL_TIMEOUT_CANCEL	0x00800000

#define DLM_IFL_DEADLOCK_CANCEL	0x01000000

#define DLM_IFL_STUB_MS		0x02000000 /* magic number for m_flags */

#define DLM_IFL_USER		0x00000001

#define DLM_IFL_ORPHAN		0x00000002

fs/dlm/lock.c

+49 −33
Original line number Diff line number Diff line
@@ -1037,10 +1037,10 @@ static int remove_from_waiters_ms(struct dlm_lkb *lkb, struct dlm_message *ms) 
	struct dlm_ls *ls = lkb->lkb_resource->res_ls;

	int error;



	if (ms != &ls->ls_stub_ms)

	if (ms->m_flags != DLM_IFL_STUB_MS)

		mutex_lock(&ls->ls_waiters_mutex);

	error = _remove_from_waiters(lkb, ms->m_type, ms);

	if (ms != &ls->ls_stub_ms)

	if (ms->m_flags != DLM_IFL_STUB_MS)

		mutex_unlock(&ls->ls_waiters_mutex);

	return error;

}
@@ -1462,14 +1462,8 @@ static void grant_lock_pending(struct dlm_rsb *r, struct dlm_lkb *lkb) 
   ALTPR/ALTCW: our rqmode may have been changed to PR or CW to become

   compatible with other granted locks */



static void munge_demoted(struct dlm_lkb *lkb, struct dlm_message *ms)

static void munge_demoted(struct dlm_lkb *lkb)

{

	if (ms->m_type != DLM_MSG_CONVERT_REPLY) {

		log_print("munge_demoted %x invalid reply type %d",

			  lkb->lkb_id, ms->m_type);

		return;

	}



	if (lkb->lkb_rqmode == DLM_LOCK_IV || lkb->lkb_grmode == DLM_LOCK_IV) {

		log_print("munge_demoted %x invalid modes gr %d rq %d",

			  lkb->lkb_id, lkb->lkb_grmode, lkb->lkb_rqmode);
@@ -2966,9 +2960,9 @@ static int send_convert(struct dlm_rsb *r, struct dlm_lkb *lkb) 
	/* down conversions go without a reply from the master */

	if (!error && down_conversion(lkb)) {

		remove_from_waiters(lkb, DLM_MSG_CONVERT_REPLY);

		r->res_ls->ls_stub_ms.m_flags = DLM_IFL_STUB_MS;

		r->res_ls->ls_stub_ms.m_type = DLM_MSG_CONVERT_REPLY;

		r->res_ls->ls_stub_ms.m_result = 0;

		r->res_ls->ls_stub_ms.m_flags = lkb->lkb_flags;

		__receive_convert_reply(r, lkb, &r->res_ls->ls_stub_ms);

	}
@@ -3156,6 +3150,9 @@ static void receive_flags(struct dlm_lkb *lkb, struct dlm_message *ms) 


static void receive_flags_reply(struct dlm_lkb *lkb, struct dlm_message *ms)

{

	if (ms->m_flags == DLM_IFL_STUB_MS)

		return;



	lkb->lkb_sbflags = ms->m_sbflags;

	lkb->lkb_flags = (lkb->lkb_flags & 0xFFFF0000) |

		         (ms->m_flags & 0x0000FFFF);
@@ -3698,7 +3695,7 @@ static void __receive_convert_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, 
		/* convert was queued on remote master */

		receive_flags_reply(lkb, ms);

		if (is_demoted(lkb))

			munge_demoted(lkb, ms);

			munge_demoted(lkb);

		del_lkb(r, lkb);

		add_lkb(r, lkb, DLM_LKSTS_CONVERT);

		add_timeout(lkb);
@@ -3708,7 +3705,7 @@ static void __receive_convert_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, 
		/* convert was granted on remote master */

		receive_flags_reply(lkb, ms);

		if (is_demoted(lkb))

			munge_demoted(lkb, ms);

			munge_demoted(lkb);

		grant_lock_pc(r, lkb, ms);

		queue_cast(r, lkb, 0);

		break;
@@ -4082,15 +4079,17 @@ void dlm_receive_buffer(union dlm_packet *p, int nodeid) 
	dlm_put_lockspace(ls);

}



static void recover_convert_waiter(struct dlm_ls *ls, struct dlm_lkb *lkb)

static void recover_convert_waiter(struct dlm_ls *ls, struct dlm_lkb *lkb,

				   struct dlm_message *ms_stub)

{

	if (middle_conversion(lkb)) {

		hold_lkb(lkb);

		ls->ls_stub_ms.m_type = DLM_MSG_CONVERT_REPLY;

		ls->ls_stub_ms.m_result = -EINPROGRESS;

		ls->ls_stub_ms.m_flags = lkb->lkb_flags;

		ls->ls_stub_ms.m_header.h_nodeid = lkb->lkb_nodeid;

		_receive_convert_reply(lkb, &ls->ls_stub_ms);

		memset(ms_stub, 0, sizeof(struct dlm_message));

		ms_stub->m_flags = DLM_IFL_STUB_MS;

		ms_stub->m_type = DLM_MSG_CONVERT_REPLY;

		ms_stub->m_result = -EINPROGRESS;

		ms_stub->m_header.h_nodeid = lkb->lkb_nodeid;

		_receive_convert_reply(lkb, ms_stub);



		/* Same special case as in receive_rcom_lock_args() */

		lkb->lkb_grmode = DLM_LOCK_IV;
@@ -4131,13 +4130,27 @@ static int waiter_needs_recovery(struct dlm_ls *ls, struct dlm_lkb *lkb) 
void dlm_recover_waiters_pre(struct dlm_ls *ls)

{

	struct dlm_lkb *lkb, *safe;

	struct dlm_message *ms_stub;

	int wait_type, stub_unlock_result, stub_cancel_result;



	ms_stub = kmalloc(GFP_KERNEL, sizeof(struct dlm_message));

	if (!ms_stub) {

		log_error(ls, "dlm_recover_waiters_pre no mem");

		return;

	}



	mutex_lock(&ls->ls_waiters_mutex);



	list_for_each_entry_safe(lkb, safe, &ls->ls_waiters, lkb_wait_reply) {

		log_debug(ls, "pre recover waiter lkid %x type %d flags %x",

			  lkb->lkb_id, lkb->lkb_wait_type, lkb->lkb_flags);



		/* exclude debug messages about unlocks because there can be so

		   many and they aren't very interesting */



		if (lkb->lkb_wait_type != DLM_MSG_UNLOCK) {

			log_debug(ls, "recover_waiter %x nodeid %d "

				  "msg %d to %d", lkb->lkb_id, lkb->lkb_nodeid,

				  lkb->lkb_wait_type, lkb->lkb_wait_nodeid);

		}



		/* all outstanding lookups, regardless of destination  will be

		   resent after recovery is done */
@@ -4183,26 +4196,28 @@ void dlm_recover_waiters_pre(struct dlm_ls *ls) 
			break;



		case DLM_MSG_CONVERT:

			recover_convert_waiter(ls, lkb);

			recover_convert_waiter(ls, lkb, ms_stub);

			break;



		case DLM_MSG_UNLOCK:

			hold_lkb(lkb);

			ls->ls_stub_ms.m_type = DLM_MSG_UNLOCK_REPLY;

			ls->ls_stub_ms.m_result = stub_unlock_result;

			ls->ls_stub_ms.m_flags = lkb->lkb_flags;

			ls->ls_stub_ms.m_header.h_nodeid = lkb->lkb_nodeid;

			_receive_unlock_reply(lkb, &ls->ls_stub_ms);

			memset(ms_stub, 0, sizeof(struct dlm_message));

			ms_stub->m_flags = DLM_IFL_STUB_MS;

			ms_stub->m_type = DLM_MSG_UNLOCK_REPLY;

			ms_stub->m_result = stub_unlock_result;

			ms_stub->m_header.h_nodeid = lkb->lkb_nodeid;

			_receive_unlock_reply(lkb, ms_stub);

			dlm_put_lkb(lkb);

			break;



		case DLM_MSG_CANCEL:

			hold_lkb(lkb);

			ls->ls_stub_ms.m_type = DLM_MSG_CANCEL_REPLY;

			ls->ls_stub_ms.m_result = stub_cancel_result;

			ls->ls_stub_ms.m_flags = lkb->lkb_flags;

			ls->ls_stub_ms.m_header.h_nodeid = lkb->lkb_nodeid;

			_receive_cancel_reply(lkb, &ls->ls_stub_ms);

			memset(ms_stub, 0, sizeof(struct dlm_message));

			ms_stub->m_flags = DLM_IFL_STUB_MS;

			ms_stub->m_type = DLM_MSG_CANCEL_REPLY;

			ms_stub->m_result = stub_cancel_result;

			ms_stub->m_header.h_nodeid = lkb->lkb_nodeid;

			_receive_cancel_reply(lkb, ms_stub);

			dlm_put_lkb(lkb);

			break;
@@ -4213,6 +4228,7 @@ void dlm_recover_waiters_pre(struct dlm_ls *ls) 
		schedule();

	}

	mutex_unlock(&ls->ls_waiters_mutex);

	kfree(ms_stub);

}



static struct dlm_lkb *find_resend_waiter(struct dlm_ls *ls)
@@ -4277,8 +4293,8 @@ int dlm_recover_waiters_post(struct dlm_ls *ls) 
		ou = is_overlap_unlock(lkb);

		err = 0;



		log_debug(ls, "recover_waiters_post %x type %d flags %x %s",

			  lkb->lkb_id, mstype, lkb->lkb_flags, r->res_name);

		log_debug(ls, "recover_waiter %x nodeid %d msg %d r_nodeid %d",

			  lkb->lkb_id, lkb->lkb_nodeid, mstype, r->res_nodeid);



		/* At this point we assume that we won't get a reply to any

		   previous op or overlap op on this lock.  First, do a big

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