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fs/btrfs/async-thread.h
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/* * Copyright (C) 2007 Oracle. 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. */ #ifndef __BTRFS_ASYNC_THREAD_ #define __BTRFS_ASYNC_THREAD_ struct btrfs_worker_thread; /* * This is similar to a workqueue, but it is meant to spread the operations * across all available cpus instead of just the CPU that was used to * queue the work. There is also some batching introduced to try and * cut down on context switches. * * By default threads are added on demand up to 2 * the number of cpus. * Changing struct btrfs_workers->max_workers is one way to prevent * demand creation of kthreads. * * the basic model of these worker threads is to embed a btrfs_work * structure in your own data struct, and use container_of in a * work function to get back to your data struct. */ struct btrfs_work { /* |
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* func should be set to the function you want called |
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* your work struct is passed as the only arg |
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* * ordered_func must be set for work sent to an ordered work queue, * and it is called to complete a given work item in the same * order they were sent to the queue. |
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*/ void (*func)(struct btrfs_work *work); |
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void (*ordered_func)(struct btrfs_work *work); void (*ordered_free)(struct btrfs_work *work); |
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/* * flags should be set to zero. It is used to make sure the * struct is only inserted once into the list. */ unsigned long flags; /* don't touch these */ struct btrfs_worker_thread *worker; struct list_head list; |
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struct list_head order_list; |
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}; struct btrfs_workers { /* current number of running workers */ int num_workers; |
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int num_workers_starting; |
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/* max number of workers allowed. changed by btrfs_start_workers */ int max_workers; |
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/* once a worker has this many requests or fewer, it is idle */ int idle_thresh; |
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/* force completions in the order they were queued */ int ordered; |
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/* more workers required, but in an interrupt handler */ int atomic_start_pending; /* * are we allowed to sleep while starting workers or are we required |
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* to start them at a later time? If we can't sleep, this indicates * which queue we need to use to schedule thread creation. |
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*/ |
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struct btrfs_workers *atomic_worker_start; |
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/* list with all the work threads. The workers on the idle thread * may be actively servicing jobs, but they haven't yet hit the * idle thresh limit above. */ |
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struct list_head worker_list; |
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struct list_head idle_list; |
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/* * when operating in ordered mode, this maintains the list * of work items waiting for completion */ struct list_head order_list; |
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struct list_head prio_order_list; |
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/* lock for finding the next worker thread to queue on */ spinlock_t lock; |
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/* lock for the ordered lists */ spinlock_t order_lock; |
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/* extra name for this worker, used for current->name */ |
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char *name; |
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}; |
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void btrfs_queue_worker(struct btrfs_workers *workers, struct btrfs_work *work); int btrfs_start_workers(struct btrfs_workers *workers); |
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int btrfs_stop_workers(struct btrfs_workers *workers); |
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void btrfs_init_workers(struct btrfs_workers *workers, char *name, int max, struct btrfs_workers *async_starter); |
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int btrfs_requeue_work(struct btrfs_work *work); |
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void btrfs_set_work_high_prio(struct btrfs_work *work); |
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#endif |