[deliverable/linux.git] / fs / dlm / ast.c

/******************************************************************************
*******************************************************************************
**
**  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
**  Copyright (C) 2004-2010 Red Hat, Inc.  All rights reserved.
**
**  This copyrighted material is made available to anyone wishing to use,
**  modify, copy, or redistribute it subject to the terms and conditions
**  of the GNU General Public License v.2.
**
*******************************************************************************
******************************************************************************/

#include "dlm_internal.h"
#include "lock.h"
#include "user.h"
#include "ast.h"

static uint64_t dlm_cb_seq;
static DEFINE_SPINLOCK(dlm_cb_seq_spin);

static void dlm_dump_lkb_callbacks(struct dlm_lkb *lkb)
{
	int i;

	log_print("last_bast %x %llu flags %x mode %d sb %d %x",
		  lkb->lkb_id,
		  (unsigned long long)lkb->lkb_last_bast.seq,
		  lkb->lkb_last_bast.flags,
		  lkb->lkb_last_bast.mode,
		  lkb->lkb_last_bast.sb_status,
		  lkb->lkb_last_bast.sb_flags);

	log_print("last_cast %x %llu flags %x mode %d sb %d %x",
		  lkb->lkb_id,
		  (unsigned long long)lkb->lkb_last_cast.seq,
		  lkb->lkb_last_cast.flags,
		  lkb->lkb_last_cast.mode,
		  lkb->lkb_last_cast.sb_status,
		  lkb->lkb_last_cast.sb_flags);

	for (i = 0; i < DLM_CALLBACKS_SIZE; i++) {
		log_print("cb %x %llu flags %x mode %d sb %d %x",
			  lkb->lkb_id,
			  (unsigned long long)lkb->lkb_callbacks[i].seq,
			  lkb->lkb_callbacks[i].flags,
			  lkb->lkb_callbacks[i].mode,
			  lkb->lkb_callbacks[i].sb_status,
			  lkb->lkb_callbacks[i].sb_flags);
	}
}

int dlm_add_lkb_callback(struct dlm_lkb *lkb, uint32_t flags, int mode,
			 int status, uint32_t sbflags, uint64_t seq)
{
	struct dlm_ls *ls = lkb->lkb_resource->res_ls;
	uint64_t prev_seq;
	int prev_mode;
	int i, rv;

	for (i = 0; i < DLM_CALLBACKS_SIZE; i++) {
		if (lkb->lkb_callbacks[i].seq)
			continue;

		/*
		 * Suppress some redundant basts here, do more on removal.
		 * Don't even add a bast if the callback just before it
		 * is a bast for the same mode or a more restrictive mode.
		 * (the addional > PR check is needed for PR/CW inversion)
		 */

		if ((i > 0) && (flags & DLM_CB_BAST) &&
		    (lkb->lkb_callbacks[i-1].flags & DLM_CB_BAST)) {

			prev_seq = lkb->lkb_callbacks[i-1].seq;
			prev_mode = lkb->lkb_callbacks[i-1].mode;

			if ((prev_mode == mode) ||
			    (prev_mode > mode && prev_mode > DLM_LOCK_PR)) {

				log_debug(ls, "skip %x add bast %llu mode %d "
					  "for bast %llu mode %d",
					  lkb->lkb_id,
					  (unsigned long long)seq,
					  mode,
					  (unsigned long long)prev_seq,
					  prev_mode);
				rv = 0;
				goto out;
			}
		}

		lkb->lkb_callbacks[i].seq = seq;
		lkb->lkb_callbacks[i].flags = flags;
		lkb->lkb_callbacks[i].mode = mode;
		lkb->lkb_callbacks[i].sb_status = status;
		lkb->lkb_callbacks[i].sb_flags = (sbflags & 0x000000FF);
		rv = 0;
		break;
	}

	if (i == DLM_CALLBACKS_SIZE) {
		log_error(ls, "no callbacks %x %llu flags %x mode %d sb %d %x",
			  lkb->lkb_id, (unsigned long long)seq,
			  flags, mode, status, sbflags);
		dlm_dump_lkb_callbacks(lkb);
		rv = -1;
		goto out;
	}
 out:
	return rv;
}

int dlm_rem_lkb_callback(struct dlm_ls *ls, struct dlm_lkb *lkb,
			 struct dlm_callback *cb, int *resid)
{
	int i, rv;

	*resid = 0;

	if (!lkb->lkb_callbacks[0].seq) {
		rv = -ENOENT;
		goto out;
	}

	/* oldest undelivered cb is callbacks[0] */

	memcpy(cb, &lkb->lkb_callbacks[0], sizeof(struct dlm_callback));
	memset(&lkb->lkb_callbacks[0], 0, sizeof(struct dlm_callback));

	/* shift others down */

	for (i = 1; i < DLM_CALLBACKS_SIZE; i++) {
		if (!lkb->lkb_callbacks[i].seq)
			break;
		memcpy(&lkb->lkb_callbacks[i-1], &lkb->lkb_callbacks[i],
		       sizeof(struct dlm_callback));
		memset(&lkb->lkb_callbacks[i], 0, sizeof(struct dlm_callback));
		(*resid)++;
	}

	/* if cb is a bast, it should be skipped if the blocking mode is
	   compatible with the last granted mode */

	if ((cb->flags & DLM_CB_BAST) && lkb->lkb_last_cast.seq) {
		if (dlm_modes_compat(cb->mode, lkb->lkb_last_cast.mode)) {
			cb->flags |= DLM_CB_SKIP;

			log_debug(ls, "skip %x bast %llu mode %d "
				  "for cast %llu mode %d",
				  lkb->lkb_id,
				  (unsigned long long)cb->seq,
				  cb->mode,
				  (unsigned long long)lkb->lkb_last_cast.seq,
				  lkb->lkb_last_cast.mode);
			rv = 0;
			goto out;
		}
	}

	if (cb->flags & DLM_CB_CAST) {
		memcpy(&lkb->lkb_last_cast, cb, sizeof(struct dlm_callback));
		lkb->lkb_last_cast_time = ktime_get();
	}

	if (cb->flags & DLM_CB_BAST) {
		memcpy(&lkb->lkb_last_bast, cb, sizeof(struct dlm_callback));
		lkb->lkb_last_bast_time = ktime_get();
	}
	rv = 0;
 out:
	return rv;
}

void dlm_add_cb(struct dlm_lkb *lkb, uint32_t flags, int mode, int status,
		uint32_t sbflags)
{
	struct dlm_ls *ls = lkb->lkb_resource->res_ls;
	uint64_t new_seq, prev_seq;
	int rv;

	spin_lock(&dlm_cb_seq_spin);
	new_seq = ++dlm_cb_seq;
	spin_unlock(&dlm_cb_seq_spin);

	if (lkb->lkb_flags & DLM_IFL_USER) {
		dlm_user_add_ast(lkb, flags, mode, status, sbflags, new_seq);
		return;
	}

	mutex_lock(&lkb->lkb_cb_mutex);
	prev_seq = lkb->lkb_callbacks[0].seq;

	rv = dlm_add_lkb_callback(lkb, flags, mode, status, sbflags, new_seq);
	if (rv < 0)
		goto out;

	if (!prev_seq) {
		kref_get(&lkb->lkb_ref);

		if (test_bit(LSFL_CB_DELAY, &ls->ls_flags)) {
			mutex_lock(&ls->ls_cb_mutex);
			list_add(&lkb->lkb_cb_list, &ls->ls_cb_delay);
			mutex_unlock(&ls->ls_cb_mutex);
		} else {
			queue_work(ls->ls_callback_wq, &lkb->lkb_cb_work);
		}
	}
 out:
	mutex_unlock(&lkb->lkb_cb_mutex);
}

void dlm_callback_work(struct work_struct *work)
{
	struct dlm_lkb *lkb = container_of(work, struct dlm_lkb, lkb_cb_work);
	struct dlm_ls *ls = lkb->lkb_resource->res_ls;
	void (*castfn) (void *astparam);
	void (*bastfn) (void *astparam, int mode);
	struct dlm_callback callbacks[DLM_CALLBACKS_SIZE];
	int i, rv, resid;

	memset(&callbacks, 0, sizeof(callbacks));

	mutex_lock(&lkb->lkb_cb_mutex);
	if (!lkb->lkb_callbacks[0].seq) {
		/* no callback work exists, shouldn't happen */
		log_error(ls, "dlm_callback_work %x no work", lkb->lkb_id);
		dlm_print_lkb(lkb);
		dlm_dump_lkb_callbacks(lkb);
	}

	for (i = 0; i < DLM_CALLBACKS_SIZE; i++) {
		rv = dlm_rem_lkb_callback(ls, lkb, &callbacks[i], &resid);
		if (rv < 0)
			break;
	}

	if (resid) {
		/* cbs remain, loop should have removed all, shouldn't happen */
		log_error(ls, "dlm_callback_work %x resid %d", lkb->lkb_id,
			  resid);
		dlm_print_lkb(lkb);
		dlm_dump_lkb_callbacks(lkb);
	}
	mutex_unlock(&lkb->lkb_cb_mutex);

	castfn = lkb->lkb_astfn;
	bastfn = lkb->lkb_bastfn;

	for (i = 0; i < DLM_CALLBACKS_SIZE; i++) {
		if (!callbacks[i].seq)
			break;
		if (callbacks[i].flags & DLM_CB_SKIP) {
			continue;
		} else if (callbacks[i].flags & DLM_CB_BAST) {
			bastfn(lkb->lkb_astparam, callbacks[i].mode);
		} else if (callbacks[i].flags & DLM_CB_CAST) {
			lkb->lkb_lksb->sb_status = callbacks[i].sb_status;
			lkb->lkb_lksb->sb_flags = callbacks[i].sb_flags;
			castfn(lkb->lkb_astparam);
		}
	}

	/* undo kref_get from dlm_add_callback, may cause lkb to be freed */
	dlm_put_lkb(lkb);
}

int dlm_callback_start(struct dlm_ls *ls)
{
	ls->ls_callback_wq = alloc_workqueue("dlm_callback",
					     WQ_UNBOUND | WQ_MEM_RECLAIM, 0);
	if (!ls->ls_callback_wq) {
		log_print("can't start dlm_callback workqueue");
		return -ENOMEM;
	}
	return 0;
}

void dlm_callback_stop(struct dlm_ls *ls)
{
	if (ls->ls_callback_wq)
		destroy_workqueue(ls->ls_callback_wq);
}

void dlm_callback_suspend(struct dlm_ls *ls)
{
	set_bit(LSFL_CB_DELAY, &ls->ls_flags);

	if (ls->ls_callback_wq)
		flush_workqueue(ls->ls_callback_wq);
}

void dlm_callback_resume(struct dlm_ls *ls)
{
	struct dlm_lkb *lkb, *safe;
	int count = 0;

	clear_bit(LSFL_CB_DELAY, &ls->ls_flags);

	if (!ls->ls_callback_wq)
		return;

	mutex_lock(&ls->ls_cb_mutex);
	list_for_each_entry_safe(lkb, safe, &ls->ls_cb_delay, lkb_cb_list) {
		list_del_init(&lkb->lkb_cb_list);
		queue_work(ls->ls_callback_wq, &lkb->lkb_cb_work);
		count++;
	}
	mutex_unlock(&ls->ls_cb_mutex);

	if (count)
		log_rinfo(ls, "dlm_callback_resume %d", count);
}
Commit	Line	Data
e7fd4179 DT	1	/******************************************************************************
	2	*******************************************************************************
	3	**
	4	** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
7fe2b319	5	** Copyright (C) 2004-2010 Red Hat, Inc. All rights reserved.
e7fd4179 DT	6	**
	7	** This copyrighted material is made available to anyone wishing to use,
	8	** modify, copy, or redistribute it subject to the terms and conditions
	9	** of the GNU General Public License v.2.
	10	**
	11	*******************************************************************************
	12	******************************************************************************/
	13
	14	#include "dlm_internal.h"
	15	#include "lock.h"
597d0cae	16	#include "user.h"
95058571	17	#include "ast.h"
e7fd4179	18
6ad22916 DT	19	static uint64_t dlm_cb_seq;
6ad22916 DT	20	static DEFINE_SPINLOCK(dlm_cb_seq_spin);
e7fd4179	21
8304d6f2 DT	22	static void dlm_dump_lkb_callbacks(struct dlm_lkb *lkb)
	23	{
	24	int i;
	25
	26	log_print("last_bast %x %llu flags %x mode %d sb %d %x",
	27	lkb->lkb_id,
	28	(unsigned long long)lkb->lkb_last_bast.seq,
	29	lkb->lkb_last_bast.flags,
	30	lkb->lkb_last_bast.mode,
	31	lkb->lkb_last_bast.sb_status,
	32	lkb->lkb_last_bast.sb_flags);
	33
	34	log_print("last_cast %x %llu flags %x mode %d sb %d %x",
	35	lkb->lkb_id,
	36	(unsigned long long)lkb->lkb_last_cast.seq,
	37	lkb->lkb_last_cast.flags,
	38	lkb->lkb_last_cast.mode,
	39	lkb->lkb_last_cast.sb_status,
	40	lkb->lkb_last_cast.sb_flags);
	41
	42	for (i = 0; i < DLM_CALLBACKS_SIZE; i++) {
	43	log_print("cb %x %llu flags %x mode %d sb %d %x",
	44	lkb->lkb_id,
	45	(unsigned long long)lkb->lkb_callbacks[i].seq,
	46	lkb->lkb_callbacks[i].flags,
	47	lkb->lkb_callbacks[i].mode,
	48	lkb->lkb_callbacks[i].sb_status,
	49	lkb->lkb_callbacks[i].sb_flags);
	50	}
	51	}
	52
8304d6f2 DT	53	int dlm_add_lkb_callback(struct dlm_lkb *lkb, uint32_t flags, int mode,
	54	int status, uint32_t sbflags, uint64_t seq)
	55	{
	56	struct dlm_ls *ls = lkb->lkb_resource->res_ls;
	57	uint64_t prev_seq;
	58	int prev_mode;
23e8e1aa	59	int i, rv;
8304d6f2 DT	60
	61	for (i = 0; i < DLM_CALLBACKS_SIZE; i++) {
	62	if (lkb->lkb_callbacks[i].seq)
	63	continue;
	64
	65	/*
	66	* Suppress some redundant basts here, do more on removal.
	67	* Don't even add a bast if the callback just before it
	68	* is a bast for the same mode or a more restrictive mode.
	69	* (the addional > PR check is needed for PR/CW inversion)
	70	*/
	71
	72	if ((i > 0) && (flags & DLM_CB_BAST) &&
	73	(lkb->lkb_callbacks[i-1].flags & DLM_CB_BAST)) {
	74
	75	prev_seq = lkb->lkb_callbacks[i-1].seq;
	76	prev_mode = lkb->lkb_callbacks[i-1].mode;
	77
	78	if ((prev_mode == mode) \|\|
	79	(prev_mode > mode && prev_mode > DLM_LOCK_PR)) {
	80
	81	log_debug(ls, "skip %x add bast %llu mode %d "
	82	"for bast %llu mode %d",
	83	lkb->lkb_id,
	84	(unsigned long long)seq,
	85	mode,
	86	(unsigned long long)prev_seq,
	87	prev_mode);
23e8e1aa DT	88	rv = 0;
23e8e1aa DT	89	goto out;
8304d6f2 DT	90	}
	91	}
	92
	93	lkb->lkb_callbacks[i].seq = seq;
	94	lkb->lkb_callbacks[i].flags = flags;
	95	lkb->lkb_callbacks[i].mode = mode;
	96	lkb->lkb_callbacks[i].sb_status = status;
	97	lkb->lkb_callbacks[i].sb_flags = (sbflags & 0x000000FF);
23e8e1aa	98	rv = 0;
8304d6f2 DT	99	break;
	100	}
	101
	102	if (i == DLM_CALLBACKS_SIZE) {
	103	log_error(ls, "no callbacks %x %llu flags %x mode %d sb %d %x",
	104	lkb->lkb_id, (unsigned long long)seq,
	105	flags, mode, status, sbflags);
	106	dlm_dump_lkb_callbacks(lkb);
23e8e1aa DT	107	rv = -1;
23e8e1aa DT	108	goto out;
8304d6f2	109	}
23e8e1aa DT	110	out:
23e8e1aa DT	111	return rv;
8304d6f2 DT	112	}
	113
	114	int dlm_rem_lkb_callback(struct dlm_ls ls, struct dlm_lkb lkb,
	115	struct dlm_callback cb, int resid)
e7fd4179	116	{
23e8e1aa	117	int i, rv;
8304d6f2 DT	118
	119	*resid = 0;
	120
23e8e1aa DT	121	if (!lkb->lkb_callbacks[0].seq) {
	122	rv = -ENOENT;
	123	goto out;
	124	}
8304d6f2 DT	125
	126	/* oldest undelivered cb is callbacks[0] */
	127
	128	memcpy(cb, &lkb->lkb_callbacks[0], sizeof(struct dlm_callback));
	129	memset(&lkb->lkb_callbacks[0], 0, sizeof(struct dlm_callback));
	130
	131	/* shift others down */
	132
	133	for (i = 1; i < DLM_CALLBACKS_SIZE; i++) {
	134	if (!lkb->lkb_callbacks[i].seq)
	135	break;
	136	memcpy(&lkb->lkb_callbacks[i-1], &lkb->lkb_callbacks[i],
	137	sizeof(struct dlm_callback));
	138	memset(&lkb->lkb_callbacks[i], 0, sizeof(struct dlm_callback));
	139	(*resid)++;
	140	}
	141
	142	/* if cb is a bast, it should be skipped if the blocking mode is
	143	compatible with the last granted mode */
	144
	145	if ((cb->flags & DLM_CB_BAST) && lkb->lkb_last_cast.seq) {
	146	if (dlm_modes_compat(cb->mode, lkb->lkb_last_cast.mode)) {
	147	cb->flags \|= DLM_CB_SKIP;
	148
	149	log_debug(ls, "skip %x bast %llu mode %d "
	150	"for cast %llu mode %d",
	151	lkb->lkb_id,
	152	(unsigned long long)cb->seq,
	153	cb->mode,
	154	(unsigned long long)lkb->lkb_last_cast.seq,
	155	lkb->lkb_last_cast.mode);
23e8e1aa DT	156	rv = 0;
23e8e1aa DT	157	goto out;
8304d6f2 DT	158	}
	159	}
	160
	161	if (cb->flags & DLM_CB_CAST) {
	162	memcpy(&lkb->lkb_last_cast, cb, sizeof(struct dlm_callback));
	163	lkb->lkb_last_cast_time = ktime_get();
	164	}
	165
	166	if (cb->flags & DLM_CB_BAST) {
	167	memcpy(&lkb->lkb_last_bast, cb, sizeof(struct dlm_callback));
	168	lkb->lkb_last_bast_time = ktime_get();
	169	}
23e8e1aa DT	170	rv = 0;
	171	out:
	172	return rv;
8304d6f2 DT	173	}
8304d6f2 DT	174
23e8e1aa DT	175	void dlm_add_cb(struct dlm_lkb *lkb, uint32_t flags, int mode, int status,
23e8e1aa DT	176	uint32_t sbflags)
8304d6f2	177	{
23e8e1aa DT	178	struct dlm_ls *ls = lkb->lkb_resource->res_ls;
23e8e1aa DT	179	uint64_t new_seq, prev_seq;
8304d6f2 DT	180	int rv;
8304d6f2 DT	181
23e8e1aa DT	182	spin_lock(&dlm_cb_seq_spin);
	183	new_seq = ++dlm_cb_seq;
	184	spin_unlock(&dlm_cb_seq_spin);
8304d6f2	185
597d0cae	186	if (lkb->lkb_flags & DLM_IFL_USER) {
23e8e1aa	187	dlm_user_add_ast(lkb, flags, mode, status, sbflags, new_seq);
597d0cae DT	188	return;
	189	}
	190
23e8e1aa DT	191	mutex_lock(&lkb->lkb_cb_mutex);
23e8e1aa DT	192	prev_seq = lkb->lkb_callbacks[0].seq;
8304d6f2	193
23e8e1aa DT	194	rv = dlm_add_lkb_callback(lkb, flags, mode, status, sbflags, new_seq);
	195	if (rv < 0)
	196	goto out;
	197
	198	if (!prev_seq) {
e7fd4179	199	kref_get(&lkb->lkb_ref);
e7fd4179	200
23e8e1aa DT	201	if (test_bit(LSFL_CB_DELAY, &ls->ls_flags)) {
	202	mutex_lock(&ls->ls_cb_mutex);
	203	list_add(&lkb->lkb_cb_list, &ls->ls_cb_delay);
	204	mutex_unlock(&ls->ls_cb_mutex);
	205	} else {
	206	queue_work(ls->ls_callback_wq, &lkb->lkb_cb_work);
	207	}
	208	}
	209	out:
	210	mutex_unlock(&lkb->lkb_cb_mutex);
e7fd4179 DT	211	}
e7fd4179 DT	212
23e8e1aa	213	void dlm_callback_work(struct work_struct *work)
e7fd4179	214	{
23e8e1aa DT	215	struct dlm_lkb *lkb = container_of(work, struct dlm_lkb, lkb_cb_work);
23e8e1aa DT	216	struct dlm_ls *ls = lkb->lkb_resource->res_ls;
7fe2b319 DT	217	void (castfn) (void astparam);
7fe2b319 DT	218	void (bastfn) (void astparam, int mode);
8304d6f2 DT	219	struct dlm_callback callbacks[DLM_CALLBACKS_SIZE];
8304d6f2 DT	220	int i, rv, resid;
722d7421	221
23e8e1aa	222	memset(&callbacks, 0, sizeof(callbacks));
e7fd4179	223
23e8e1aa DT	224	mutex_lock(&lkb->lkb_cb_mutex);
	225	if (!lkb->lkb_callbacks[0].seq) {
	226	/* no callback work exists, shouldn't happen */
	227	log_error(ls, "dlm_callback_work %x no work", lkb->lkb_id);
	228	dlm_print_lkb(lkb);
	229	dlm_dump_lkb_callbacks(lkb);
	230	}
e7fd4179	231
23e8e1aa DT	232	for (i = 0; i < DLM_CALLBACKS_SIZE; i++) {
	233	rv = dlm_rem_lkb_callback(ls, lkb, &callbacks[i], &resid);
	234	if (rv < 0)
	235	break;
	236	}
7fe2b319	237
23e8e1aa DT	238	if (resid) {
	239	/* cbs remain, loop should have removed all, shouldn't happen */
	240	log_error(ls, "dlm_callback_work %x resid %d", lkb->lkb_id,
	241	resid);
	242	dlm_print_lkb(lkb);
	243	dlm_dump_lkb_callbacks(lkb);
	244	}
	245	mutex_unlock(&lkb->lkb_cb_mutex);
7fe2b319	246
23e8e1aa DT	247	castfn = lkb->lkb_astfn;
23e8e1aa DT	248	bastfn = lkb->lkb_bastfn;
7fe2b319	249
23e8e1aa DT	250	for (i = 0; i < DLM_CALLBACKS_SIZE; i++) {
	251	if (!callbacks[i].seq)
	252	break;
	253	if (callbacks[i].flags & DLM_CB_SKIP) {
	254	continue;
	255	} else if (callbacks[i].flags & DLM_CB_BAST) {
	256	bastfn(lkb->lkb_astparam, callbacks[i].mode);
	257	} else if (callbacks[i].flags & DLM_CB_CAST) {
	258	lkb->lkb_lksb->sb_status = callbacks[i].sb_status;
	259	lkb->lkb_lksb->sb_flags = callbacks[i].sb_flags;
	260	castfn(lkb->lkb_astparam);
7fe2b319	261	}
e7fd4179	262	}
e7fd4179	263
23e8e1aa DT	264	/* undo kref_get from dlm_add_callback, may cause lkb to be freed */
23e8e1aa DT	265	dlm_put_lkb(lkb);
e7fd4179 DT	266	}
e7fd4179 DT	267
23e8e1aa	268	int dlm_callback_start(struct dlm_ls *ls)
e7fd4179	269	{
23e8e1aa	270	ls->ls_callback_wq = alloc_workqueue("dlm_callback",
ededf305	271	WQ_UNBOUND \| WQ_MEM_RECLAIM, 0);
23e8e1aa DT	272	if (!ls->ls_callback_wq) {
	273	log_print("can't start dlm_callback workqueue");
	274	return -ENOMEM;
e7fd4179 DT	275	}
	276	return 0;
	277	}
	278
23e8e1aa	279	void dlm_callback_stop(struct dlm_ls *ls)
e7fd4179	280	{
23e8e1aa DT	281	if (ls->ls_callback_wq)
23e8e1aa DT	282	destroy_workqueue(ls->ls_callback_wq);
e7fd4179 DT	283	}
e7fd4179 DT	284
23e8e1aa	285	void dlm_callback_suspend(struct dlm_ls *ls)
e7fd4179	286	{
23e8e1aa	287	set_bit(LSFL_CB_DELAY, &ls->ls_flags);
e7fd4179	288
23e8e1aa DT	289	if (ls->ls_callback_wq)
23e8e1aa DT	290	flush_workqueue(ls->ls_callback_wq);
e7fd4179 DT	291	}
e7fd4179 DT	292
23e8e1aa	293	void dlm_callback_resume(struct dlm_ls *ls)
e7fd4179	294	{
23e8e1aa DT	295	struct dlm_lkb lkb, safe;
23e8e1aa DT	296	int count = 0;
e7fd4179	297
23e8e1aa DT	298	clear_bit(LSFL_CB_DELAY, &ls->ls_flags);
	299
	300	if (!ls->ls_callback_wq)
	301	return;
	302
	303	mutex_lock(&ls->ls_cb_mutex);
	304	list_for_each_entry_safe(lkb, safe, &ls->ls_cb_delay, lkb_cb_list) {
	305	list_del_init(&lkb->lkb_cb_list);
	306	queue_work(ls->ls_callback_wq, &lkb->lkb_cb_work);
	307	count++;
	308	}
	309	mutex_unlock(&ls->ls_cb_mutex);
	310
4875647a	311	if (count)
075f0177	312	log_rinfo(ls, "dlm_callback_resume %d", count);
e7fd4179 DT	313	}
e7fd4179 DT	314