[deliverable/linux.git] / fs / btrfs / async-thread.c

/*
 * Copyright (C) 2007 Oracle.  All rights reserved.
 * Copyright (C) 2014 Fujitsu.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#include <linux/kthread.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/freezer.h>
#include "async-thread.h"
#include "ctree.h"

#define WORK_DONE_BIT 0
#define WORK_ORDER_DONE_BIT 1
#define WORK_HIGH_PRIO_BIT 2

#define NO_THRESHOLD (-1)
#define DFT_THRESHOLD (32)

struct __btrfs_workqueue {
	struct workqueue_struct *normal_wq;
	/* List head pointing to ordered work list */
	struct list_head ordered_list;

	/* Spinlock for ordered_list */
	spinlock_t list_lock;

	/* Thresholding related variants */
	atomic_t pending;
	int max_active;
	int current_max;
	int thresh;
	unsigned int count;
	spinlock_t thres_lock;
};

struct btrfs_workqueue {
	struct __btrfs_workqueue *normal;
	struct __btrfs_workqueue *high;
};

static void normal_work_helper(struct btrfs_work *work);

#define BTRFS_WORK_HELPER(name)					\
void btrfs_##name(struct work_struct *arg)				\
{									\
	struct btrfs_work *work = container_of(arg, struct btrfs_work,	\
					       normal_work);		\
	normal_work_helper(work);					\
}

BTRFS_WORK_HELPER(worker_helper);
BTRFS_WORK_HELPER(delalloc_helper);
BTRFS_WORK_HELPER(flush_delalloc_helper);
BTRFS_WORK_HELPER(cache_helper);
BTRFS_WORK_HELPER(submit_helper);
BTRFS_WORK_HELPER(fixup_helper);
BTRFS_WORK_HELPER(endio_helper);
BTRFS_WORK_HELPER(endio_meta_helper);
BTRFS_WORK_HELPER(endio_meta_write_helper);
BTRFS_WORK_HELPER(endio_raid56_helper);
BTRFS_WORK_HELPER(endio_repair_helper);
BTRFS_WORK_HELPER(rmw_helper);
BTRFS_WORK_HELPER(endio_write_helper);
BTRFS_WORK_HELPER(freespace_write_helper);
BTRFS_WORK_HELPER(delayed_meta_helper);
BTRFS_WORK_HELPER(readahead_helper);
BTRFS_WORK_HELPER(qgroup_rescan_helper);
BTRFS_WORK_HELPER(extent_refs_helper);
BTRFS_WORK_HELPER(scrub_helper);
BTRFS_WORK_HELPER(scrubwrc_helper);
BTRFS_WORK_HELPER(scrubnc_helper);

static struct __btrfs_workqueue *
__btrfs_alloc_workqueue(const char *name, unsigned int flags, int max_active,
			 int thresh)
{
	struct __btrfs_workqueue *ret = kzalloc(sizeof(*ret), GFP_NOFS);

	if (!ret)
		return NULL;

	ret->max_active = max_active;
	atomic_set(&ret->pending, 0);
	if (thresh == 0)
		thresh = DFT_THRESHOLD;
	/* For low threshold, disabling threshold is a better choice */
	if (thresh < DFT_THRESHOLD) {
		ret->current_max = max_active;
		ret->thresh = NO_THRESHOLD;
	} else {
		ret->current_max = 1;
		ret->thresh = thresh;
	}

	if (flags & WQ_HIGHPRI)
		ret->normal_wq = alloc_workqueue("%s-%s-high", flags,
						 ret->max_active,
						 "btrfs", name);
	else
		ret->normal_wq = alloc_workqueue("%s-%s", flags,
						 ret->max_active, "btrfs",
						 name);
	if (!ret->normal_wq) {
		kfree(ret);
		return NULL;
	}

	INIT_LIST_HEAD(&ret->ordered_list);
	spin_lock_init(&ret->list_lock);
	spin_lock_init(&ret->thres_lock);
	trace_btrfs_workqueue_alloc(ret, name, flags & WQ_HIGHPRI);
	return ret;
}

static inline void
__btrfs_destroy_workqueue(struct __btrfs_workqueue *wq);

struct btrfs_workqueue *btrfs_alloc_workqueue(const char *name,
					      unsigned int flags,
					      int max_active,
					      int thresh)
{
	struct btrfs_workqueue *ret = kzalloc(sizeof(*ret), GFP_NOFS);

	if (!ret)
		return NULL;

	ret->normal = __btrfs_alloc_workqueue(name, flags & ~WQ_HIGHPRI,
					      max_active, thresh);
	if (!ret->normal) {
		kfree(ret);
		return NULL;
	}

	if (flags & WQ_HIGHPRI) {
		ret->high = __btrfs_alloc_workqueue(name, flags, max_active,
						    thresh);
		if (!ret->high) {
			__btrfs_destroy_workqueue(ret->normal);
			kfree(ret);
			return NULL;
		}
	}
	return ret;
}

/*
 * Hook for threshold which will be called in btrfs_queue_work.
 * This hook WILL be called in IRQ handler context,
 * so workqueue_set_max_active MUST NOT be called in this hook
 */
static inline void thresh_queue_hook(struct __btrfs_workqueue *wq)
{
	if (wq->thresh == NO_THRESHOLD)
		return;
	atomic_inc(&wq->pending);
}

/*
 * Hook for threshold which will be called before executing the work,
 * This hook is called in kthread content.
 * So workqueue_set_max_active is called here.
 */
static inline void thresh_exec_hook(struct __btrfs_workqueue *wq)
{
	int new_max_active;
	long pending;
	int need_change = 0;

	if (wq->thresh == NO_THRESHOLD)
		return;

	atomic_dec(&wq->pending);
	spin_lock(&wq->thres_lock);
	/*
	 * Use wq->count to limit the calling frequency of
	 * workqueue_set_max_active.
	 */
	wq->count++;
	wq->count %= (wq->thresh / 4);
	if (!wq->count)
		goto  out;
	new_max_active = wq->current_max;

	/*
	 * pending may be changed later, but it's OK since we really
	 * don't need it so accurate to calculate new_max_active.
	 */
	pending = atomic_read(&wq->pending);
	if (pending > wq->thresh)
		new_max_active++;
	if (pending < wq->thresh / 2)
		new_max_active--;
	new_max_active = clamp_val(new_max_active, 1, wq->max_active);
	if (new_max_active != wq->current_max)  {
		need_change = 1;
		wq->current_max = new_max_active;
	}
out:
	spin_unlock(&wq->thres_lock);

	if (need_change) {
		workqueue_set_max_active(wq->normal_wq, wq->current_max);
	}
}

static void run_ordered_work(struct __btrfs_workqueue *wq)
{
	struct list_head *list = &wq->ordered_list;
	struct btrfs_work *work;
	spinlock_t *lock = &wq->list_lock;
	unsigned long flags;

	while (1) {
		spin_lock_irqsave(lock, flags);
		if (list_empty(list))
			break;
		work = list_entry(list->next, struct btrfs_work,
				  ordered_list);
		if (!test_bit(WORK_DONE_BIT, &work->flags))
			break;

		/*
		 * we are going to call the ordered done function, but
		 * we leave the work item on the list as a barrier so
		 * that later work items that are done don't have their
		 * functions called before this one returns
		 */
		if (test_and_set_bit(WORK_ORDER_DONE_BIT, &work->flags))
			break;
		trace_btrfs_ordered_sched(work);
		spin_unlock_irqrestore(lock, flags);
		work->ordered_func(work);

		/* now take the lock again and drop our item from the list */
		spin_lock_irqsave(lock, flags);
		list_del(&work->ordered_list);
		spin_unlock_irqrestore(lock, flags);

		/*
		 * we don't want to call the ordered free functions
		 * with the lock held though
		 */
		work->ordered_free(work);
		trace_btrfs_all_work_done(work);
	}
	spin_unlock_irqrestore(lock, flags);
}

static void normal_work_helper(struct btrfs_work *work)
{
	struct __btrfs_workqueue *wq;
	int need_order = 0;

	/*
	 * We should not touch things inside work in the following cases:
	 * 1) after work->func() if it has no ordered_free
	 *    Since the struct is freed in work->func().
	 * 2) after setting WORK_DONE_BIT
	 *    The work may be freed in other threads almost instantly.
	 * So we save the needed things here.
	 */
	if (work->ordered_func)
		need_order = 1;
	wq = work->wq;

	trace_btrfs_work_sched(work);
	thresh_exec_hook(wq);
	work->func(work);
	if (need_order) {
		set_bit(WORK_DONE_BIT, &work->flags);
		run_ordered_work(wq);
	}
	if (!need_order)
		trace_btrfs_all_work_done(work);
}

void btrfs_init_work(struct btrfs_work *work, btrfs_work_func_t uniq_func,
		     btrfs_func_t func,
		     btrfs_func_t ordered_func,
		     btrfs_func_t ordered_free)
{
	work->func = func;
	work->ordered_func = ordered_func;
	work->ordered_free = ordered_free;
	INIT_WORK(&work->normal_work, uniq_func);
	INIT_LIST_HEAD(&work->ordered_list);
	work->flags = 0;
}

static inline void __btrfs_queue_work(struct __btrfs_workqueue *wq,
				      struct btrfs_work *work)
{
	unsigned long flags;

	work->wq = wq;
	thresh_queue_hook(wq);
	if (work->ordered_func) {
		spin_lock_irqsave(&wq->list_lock, flags);
		list_add_tail(&work->ordered_list, &wq->ordered_list);
		spin_unlock_irqrestore(&wq->list_lock, flags);
	}
	queue_work(wq->normal_wq, &work->normal_work);
	trace_btrfs_work_queued(work);
}

void btrfs_queue_work(struct btrfs_workqueue *wq,
		      struct btrfs_work *work)
{
	struct __btrfs_workqueue *dest_wq;

	if (test_bit(WORK_HIGH_PRIO_BIT, &work->flags) && wq->high)
		dest_wq = wq->high;
	else
		dest_wq = wq->normal;
	__btrfs_queue_work(dest_wq, work);
}

static inline void
__btrfs_destroy_workqueue(struct __btrfs_workqueue *wq)
{
	destroy_workqueue(wq->normal_wq);
	trace_btrfs_workqueue_destroy(wq);
	kfree(wq);
}

void btrfs_destroy_workqueue(struct btrfs_workqueue *wq)
{
	if (!wq)
		return;
	if (wq->high)
		__btrfs_destroy_workqueue(wq->high);
	__btrfs_destroy_workqueue(wq->normal);
	kfree(wq);
}

void btrfs_workqueue_set_max(struct btrfs_workqueue *wq, int max)
{
	if (!wq)
		return;
	wq->normal->max_active = max;
	if (wq->high)
		wq->high->max_active = max;
}

void btrfs_set_work_high_priority(struct btrfs_work *work)
{
	set_bit(WORK_HIGH_PRIO_BIT, &work->flags);
}
Commit	Line	Data
8b712842 CM	1	/*
8b712842 CM	2	* Copyright (C) 2007 Oracle. All rights reserved.
08a9ff32	3	* Copyright (C) 2014 Fujitsu. All rights reserved.
8b712842 CM	4	*
	5	* This program is free software; you can redistribute it and/or
	6	* modify it under the terms of the GNU General Public
	7	* License v2 as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	12	* General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public
	15	* License along with this program; if not, write to the
	16	* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	17	* Boston, MA 021110-1307, USA.
	18	*/
	19
	20	#include <linux/kthread.h>
5a0e3ad6	21	#include <linux/slab.h>
8b712842 CM	22	#include <linux/list.h>
8b712842 CM	23	#include <linux/spinlock.h>
b51912c9	24	#include <linux/freezer.h>
8b712842	25	#include "async-thread.h"
52483bc2	26	#include "ctree.h"
8b712842	27
a046e9c8 QW	28	#define WORK_DONE_BIT 0
	29	#define WORK_ORDER_DONE_BIT 1
	30	#define WORK_HIGH_PRIO_BIT 2
4a69a410	31
0bd9289c QW	32	#define NO_THRESHOLD (-1)
	33	#define DFT_THRESHOLD (32)
	34
d458b054	35	struct __btrfs_workqueue {
08a9ff32 QW	36	struct workqueue_struct *normal_wq;
	37	/* List head pointing to ordered work list */
	38	struct list_head ordered_list;
	39
	40	/* Spinlock for ordered_list */
	41	spinlock_t list_lock;
0bd9289c QW	42
	43	/* Thresholding related variants */
	44	atomic_t pending;
	45	int max_active;
	46	int current_max;
	47	int thresh;
	48	unsigned int count;
	49	spinlock_t thres_lock;
08a9ff32 QW	50	};
08a9ff32 QW	51
d458b054 QW	52	struct btrfs_workqueue {
	53	struct __btrfs_workqueue *normal;
	54	struct __btrfs_workqueue *high;
1ca08976 QW	55	};
1ca08976 QW	56
9e0af237 LB	57	static void normal_work_helper(struct btrfs_work *work);
	58
	59	#define BTRFS_WORK_HELPER(name) \
	60	void btrfs_##name(struct work_struct *arg) \
	61	{ \
	62	struct btrfs_work *work = container_of(arg, struct btrfs_work, \
	63	normal_work); \
	64	normal_work_helper(work); \
	65	}
	66
	67	BTRFS_WORK_HELPER(worker_helper);
	68	BTRFS_WORK_HELPER(delalloc_helper);
	69	BTRFS_WORK_HELPER(flush_delalloc_helper);
	70	BTRFS_WORK_HELPER(cache_helper);
	71	BTRFS_WORK_HELPER(submit_helper);
	72	BTRFS_WORK_HELPER(fixup_helper);
	73	BTRFS_WORK_HELPER(endio_helper);
	74	BTRFS_WORK_HELPER(endio_meta_helper);
	75	BTRFS_WORK_HELPER(endio_meta_write_helper);
	76	BTRFS_WORK_HELPER(endio_raid56_helper);
8b110e39	77	BTRFS_WORK_HELPER(endio_repair_helper);
9e0af237 LB	78	BTRFS_WORK_HELPER(rmw_helper);
	79	BTRFS_WORK_HELPER(endio_write_helper);
	80	BTRFS_WORK_HELPER(freespace_write_helper);
	81	BTRFS_WORK_HELPER(delayed_meta_helper);
	82	BTRFS_WORK_HELPER(readahead_helper);
	83	BTRFS_WORK_HELPER(qgroup_rescan_helper);
	84	BTRFS_WORK_HELPER(extent_refs_helper);
	85	BTRFS_WORK_HELPER(scrub_helper);
	86	BTRFS_WORK_HELPER(scrubwrc_helper);
	87	BTRFS_WORK_HELPER(scrubnc_helper);
	88
	89	static struct __btrfs_workqueue *
6f011058	90	__btrfs_alloc_workqueue(const char *name, unsigned int flags, int max_active,
c3a46891	91	int thresh)
1ca08976	92	{
d458b054	93	struct __btrfs_workqueue ret = kzalloc(sizeof(ret), GFP_NOFS);
1ca08976	94
5d99a998	95	if (!ret)
1ca08976 QW	96	return NULL;
1ca08976 QW	97
0bd9289c QW	98	ret->max_active = max_active;
	99	atomic_set(&ret->pending, 0);
	100	if (thresh == 0)
	101	thresh = DFT_THRESHOLD;
	102	/* For low threshold, disabling threshold is a better choice */
	103	if (thresh < DFT_THRESHOLD) {
	104	ret->current_max = max_active;
	105	ret->thresh = NO_THRESHOLD;
	106	} else {
	107	ret->current_max = 1;
	108	ret->thresh = thresh;
	109	}
	110
1ca08976 QW	111	if (flags & WQ_HIGHPRI)
1ca08976 QW	112	ret->normal_wq = alloc_workqueue("%s-%s-high", flags,
0bd9289c QW	113	ret->max_active,
0bd9289c QW	114	"btrfs", name);
1ca08976 QW	115	else
1ca08976 QW	116	ret->normal_wq = alloc_workqueue("%s-%s", flags,
0bd9289c QW	117	ret->max_active, "btrfs",
0bd9289c QW	118	name);
5d99a998	119	if (!ret->normal_wq) {
1ca08976 QW	120	kfree(ret);
	121	return NULL;
	122	}
	123
	124	INIT_LIST_HEAD(&ret->ordered_list);
	125	spin_lock_init(&ret->list_lock);
0bd9289c	126	spin_lock_init(&ret->thres_lock);
c3a46891	127	trace_btrfs_workqueue_alloc(ret, name, flags & WQ_HIGHPRI);
1ca08976 QW	128	return ret;
	129	}
	130
	131	static inline void
d458b054	132	__btrfs_destroy_workqueue(struct __btrfs_workqueue *wq);
1ca08976	133
c3a46891	134	struct btrfs_workqueue btrfs_alloc_workqueue(const char name,
6f011058	135	unsigned int flags,
d458b054 QW	136	int max_active,
d458b054 QW	137	int thresh)
08a9ff32	138	{
d458b054	139	struct btrfs_workqueue ret = kzalloc(sizeof(ret), GFP_NOFS);
08a9ff32	140
5d99a998	141	if (!ret)
08a9ff32 QW	142	return NULL;
08a9ff32 QW	143
1ca08976	144	ret->normal = __btrfs_alloc_workqueue(name, flags & ~WQ_HIGHPRI,
0bd9289c	145	max_active, thresh);
5d99a998	146	if (!ret->normal) {
08a9ff32 QW	147	kfree(ret);
	148	return NULL;
	149	}
	150
1ca08976	151	if (flags & WQ_HIGHPRI) {
0bd9289c QW	152	ret->high = __btrfs_alloc_workqueue(name, flags, max_active,
0bd9289c QW	153	thresh);
5d99a998	154	if (!ret->high) {
1ca08976 QW	155	__btrfs_destroy_workqueue(ret->normal);
	156	kfree(ret);
	157	return NULL;
	158	}
	159	}
08a9ff32 QW	160	return ret;
	161	}
	162
0bd9289c QW	163	/*
	164	* Hook for threshold which will be called in btrfs_queue_work.
	165	* This hook WILL be called in IRQ handler context,
	166	* so workqueue_set_max_active MUST NOT be called in this hook
	167	*/
d458b054	168	static inline void thresh_queue_hook(struct __btrfs_workqueue *wq)
0bd9289c QW	169	{
	170	if (wq->thresh == NO_THRESHOLD)
	171	return;
	172	atomic_inc(&wq->pending);
	173	}
	174
	175	/*
	176	* Hook for threshold which will be called before executing the work,
	177	* This hook is called in kthread content.
	178	* So workqueue_set_max_active is called here.
	179	*/
d458b054	180	static inline void thresh_exec_hook(struct __btrfs_workqueue *wq)
0bd9289c QW	181	{
	182	int new_max_active;
	183	long pending;
	184	int need_change = 0;
	185
	186	if (wq->thresh == NO_THRESHOLD)
	187	return;
	188
	189	atomic_dec(&wq->pending);
	190	spin_lock(&wq->thres_lock);
	191	/*
	192	* Use wq->count to limit the calling frequency of
	193	* workqueue_set_max_active.
	194	*/
	195	wq->count++;
	196	wq->count %= (wq->thresh / 4);
	197	if (!wq->count)
	198	goto out;
	199	new_max_active = wq->current_max;
	200
	201	/*
	202	* pending may be changed later, but it's OK since we really
	203	* don't need it so accurate to calculate new_max_active.
	204	*/
	205	pending = atomic_read(&wq->pending);
	206	if (pending > wq->thresh)
	207	new_max_active++;
	208	if (pending < wq->thresh / 2)
	209	new_max_active--;
	210	new_max_active = clamp_val(new_max_active, 1, wq->max_active);
	211	if (new_max_active != wq->current_max) {
	212	need_change = 1;
	213	wq->current_max = new_max_active;
	214	}
	215	out:
	216	spin_unlock(&wq->thres_lock);
	217
	218	if (need_change) {
	219	workqueue_set_max_active(wq->normal_wq, wq->current_max);
	220	}
	221	}
	222
d458b054	223	static void run_ordered_work(struct __btrfs_workqueue *wq)
08a9ff32 QW	224	{
08a9ff32 QW	225	struct list_head *list = &wq->ordered_list;
d458b054	226	struct btrfs_work *work;
08a9ff32 QW	227	spinlock_t *lock = &wq->list_lock;
	228	unsigned long flags;
	229
	230	while (1) {
	231	spin_lock_irqsave(lock, flags);
	232	if (list_empty(list))
	233	break;
d458b054	234	work = list_entry(list->next, struct btrfs_work,
08a9ff32 QW	235	ordered_list);
	236	if (!test_bit(WORK_DONE_BIT, &work->flags))
	237	break;
	238
	239	/*
	240	* we are going to call the ordered done function, but
	241	* we leave the work item on the list as a barrier so
	242	* that later work items that are done don't have their
	243	* functions called before this one returns
	244	*/
	245	if (test_and_set_bit(WORK_ORDER_DONE_BIT, &work->flags))
	246	break;
52483bc2	247	trace_btrfs_ordered_sched(work);
08a9ff32 QW	248	spin_unlock_irqrestore(lock, flags);
	249	work->ordered_func(work);
	250
	251	/* now take the lock again and drop our item from the list */
	252	spin_lock_irqsave(lock, flags);
	253	list_del(&work->ordered_list);
	254	spin_unlock_irqrestore(lock, flags);
	255
	256	/*
	257	* we don't want to call the ordered free functions
	258	* with the lock held though
	259	*/
	260	work->ordered_free(work);
52483bc2	261	trace_btrfs_all_work_done(work);
08a9ff32 QW	262	}
	263	spin_unlock_irqrestore(lock, flags);
	264	}
	265
9e0af237	266	static void normal_work_helper(struct btrfs_work *work)
08a9ff32	267	{
d458b054	268	struct __btrfs_workqueue *wq;
08a9ff32 QW	269	int need_order = 0;
08a9ff32 QW	270
08a9ff32 QW	271	/*
	272	* We should not touch things inside work in the following cases:
	273	* 1) after work->func() if it has no ordered_free
	274	* Since the struct is freed in work->func().
	275	* 2) after setting WORK_DONE_BIT
	276	* The work may be freed in other threads almost instantly.
	277	* So we save the needed things here.
	278	*/
	279	if (work->ordered_func)
	280	need_order = 1;
	281	wq = work->wq;
	282
52483bc2	283	trace_btrfs_work_sched(work);
0bd9289c	284	thresh_exec_hook(wq);
08a9ff32 QW	285	work->func(work);
	286	if (need_order) {
	287	set_bit(WORK_DONE_BIT, &work->flags);
	288	run_ordered_work(wq);
	289	}
52483bc2 QW	290	if (!need_order)
52483bc2 QW	291	trace_btrfs_all_work_done(work);
08a9ff32 QW	292	}
08a9ff32 QW	293
9e0af237	294	void btrfs_init_work(struct btrfs_work *work, btrfs_work_func_t uniq_func,
6db8914f QW	295	btrfs_func_t func,
	296	btrfs_func_t ordered_func,
	297	btrfs_func_t ordered_free)
08a9ff32 QW	298	{
	299	work->func = func;
	300	work->ordered_func = ordered_func;
	301	work->ordered_free = ordered_free;
9e0af237	302	INIT_WORK(&work->normal_work, uniq_func);
08a9ff32 QW	303	INIT_LIST_HEAD(&work->ordered_list);
	304	work->flags = 0;
	305	}
	306
d458b054 QW	307	static inline void __btrfs_queue_work(struct __btrfs_workqueue *wq,
d458b054 QW	308	struct btrfs_work *work)
08a9ff32 QW	309	{
	310	unsigned long flags;
	311
	312	work->wq = wq;
0bd9289c	313	thresh_queue_hook(wq);
08a9ff32 QW	314	if (work->ordered_func) {
	315	spin_lock_irqsave(&wq->list_lock, flags);
	316	list_add_tail(&work->ordered_list, &wq->ordered_list);
	317	spin_unlock_irqrestore(&wq->list_lock, flags);
	318	}
	319	queue_work(wq->normal_wq, &work->normal_work);
52483bc2	320	trace_btrfs_work_queued(work);
08a9ff32 QW	321	}
08a9ff32 QW	322
d458b054 QW	323	void btrfs_queue_work(struct btrfs_workqueue *wq,
d458b054 QW	324	struct btrfs_work *work)
1ca08976	325	{
d458b054	326	struct __btrfs_workqueue *dest_wq;
1ca08976 QW	327
	328	if (test_bit(WORK_HIGH_PRIO_BIT, &work->flags) && wq->high)
	329	dest_wq = wq->high;
	330	else
	331	dest_wq = wq->normal;
	332	__btrfs_queue_work(dest_wq, work);
	333	}
	334
	335	static inline void
d458b054	336	__btrfs_destroy_workqueue(struct __btrfs_workqueue *wq)
08a9ff32 QW	337	{
08a9ff32 QW	338	destroy_workqueue(wq->normal_wq);
c3a46891	339	trace_btrfs_workqueue_destroy(wq);
08a9ff32 QW	340	kfree(wq);
	341	}
	342
d458b054	343	void btrfs_destroy_workqueue(struct btrfs_workqueue *wq)
1ca08976 QW	344	{
	345	if (!wq)
	346	return;
	347	if (wq->high)
	348	__btrfs_destroy_workqueue(wq->high);
	349	__btrfs_destroy_workqueue(wq->normal);
ef66af10	350	kfree(wq);
1ca08976 QW	351	}
1ca08976 QW	352
d458b054	353	void btrfs_workqueue_set_max(struct btrfs_workqueue *wq, int max)
08a9ff32	354	{
800ee224 ST	355	if (!wq)
800ee224 ST	356	return;
0bd9289c	357	wq->normal->max_active = max;
1ca08976	358	if (wq->high)
0bd9289c	359	wq->high->max_active = max;
1ca08976 QW	360	}
1ca08976 QW	361
d458b054	362	void btrfs_set_work_high_priority(struct btrfs_work *work)
1ca08976 QW	363	{
1ca08976 QW	364	set_bit(WORK_HIGH_PRIO_BIT, &work->flags);
08a9ff32	365	}