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TOMOYO Linux Cross Reference
Linux/fs/btrfs/async-thread.h

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  1 /*
  2  * Copyright (C) 2007 Oracle.  All rights reserved.
  3  *
  4  * This program is free software; you can redistribute it and/or
  5  * modify it under the terms of the GNU General Public
  6  * License v2 as published by the Free Software Foundation.
  7  *
  8  * This program is distributed in the hope that it will be useful,
  9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 11  * General Public License for more details.
 12  *
 13  * You should have received a copy of the GNU General Public
 14  * License along with this program; if not, write to the
 15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 16  * Boston, MA 021110-1307, USA.
 17  */
 18 
 19 #ifndef __BTRFS_ASYNC_THREAD_
 20 #define __BTRFS_ASYNC_THREAD_
 21 
 22 struct btrfs_worker_thread;
 23 
 24 /*
 25  * This is similar to a workqueue, but it is meant to spread the operations
 26  * across all available cpus instead of just the CPU that was used to
 27  * queue the work.  There is also some batching introduced to try and
 28  * cut down on context switches.
 29  *
 30  * By default threads are added on demand up to 2 * the number of cpus.
 31  * Changing struct btrfs_workers->max_workers is one way to prevent
 32  * demand creation of kthreads.
 33  *
 34  * the basic model of these worker threads is to embed a btrfs_work
 35  * structure in your own data struct, and use container_of in a
 36  * work function to get back to your data struct.
 37  */
 38 struct btrfs_work {
 39         /*
 40          * func should be set to the function you want called
 41          * your work struct is passed as the only arg
 42          *
 43          * ordered_func must be set for work sent to an ordered work queue,
 44          * and it is called to complete a given work item in the same
 45          * order they were sent to the queue.
 46          */
 47         void (*func)(struct btrfs_work *work);
 48         void (*ordered_func)(struct btrfs_work *work);
 49         void (*ordered_free)(struct btrfs_work *work);
 50 
 51         /*
 52          * flags should be set to zero.  It is used to make sure the
 53          * struct is only inserted once into the list.
 54          */
 55         unsigned long flags;
 56 
 57         /* don't touch these */
 58         struct btrfs_worker_thread *worker;
 59         struct list_head list;
 60         struct list_head order_list;
 61 };
 62 
 63 struct btrfs_workers {
 64         /* current number of running workers */
 65         int num_workers;
 66 
 67         int num_workers_starting;
 68 
 69         /* max number of workers allowed.  changed by btrfs_start_workers */
 70         int max_workers;
 71 
 72         /* once a worker has this many requests or fewer, it is idle */
 73         int idle_thresh;
 74 
 75         /* force completions in the order they were queued */
 76         int ordered;
 77 
 78         /* more workers required, but in an interrupt handler */
 79         int atomic_start_pending;
 80 
 81         /*
 82          * are we allowed to sleep while starting workers or are we required
 83          * to start them at a later time?  If we can't sleep, this indicates
 84          * which queue we need to use to schedule thread creation.
 85          */
 86         struct btrfs_workers *atomic_worker_start;
 87 
 88         /* list with all the work threads.  The workers on the idle thread
 89          * may be actively servicing jobs, but they haven't yet hit the
 90          * idle thresh limit above.
 91          */
 92         struct list_head worker_list;
 93         struct list_head idle_list;
 94 
 95         /*
 96          * when operating in ordered mode, this maintains the list
 97          * of work items waiting for completion
 98          */
 99         struct list_head order_list;
100         struct list_head prio_order_list;
101 
102         /* lock for finding the next worker thread to queue on */
103         spinlock_t lock;
104 
105         /* lock for the ordered lists */
106         spinlock_t order_lock;
107 
108         /* extra name for this worker, used for current->name */
109         char *name;
110 };
111 
112 int btrfs_queue_worker(struct btrfs_workers *workers, struct btrfs_work *work);
113 int btrfs_start_workers(struct btrfs_workers *workers, int num_workers);
114 int btrfs_stop_workers(struct btrfs_workers *workers);
115 void btrfs_init_workers(struct btrfs_workers *workers, char *name, int max,
116                         struct btrfs_workers *async_starter);
117 int btrfs_requeue_work(struct btrfs_work *work);
118 void btrfs_set_work_high_prio(struct btrfs_work *work);
119 #endif
120 

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