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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192/* SPDX-License-Identifier: GPL-2.0-only *//* * Copyright (C) 2001 - 2003 Sistina Software * Copyright (C) 2004 - 2008 Red Hat, Inc. All rights reserved. * * kcopyd provides a simple interface for copying an area of one * block-device to one or more other block-devices, either synchronous * or with an asynchronous completion notification. * * This file is released under the GPL. */
#ifndef _LINUX_DM_KCOPYD_H#define _LINUX_DM_KCOPYD_H
#ifdef __KERNEL__
#include <linux/dm-io.h>
/* FIXME: make this configurable */#define DM_KCOPYD_MAX_REGIONS 8
#define DM_KCOPYD_IGNORE_ERROR 1#define DM_KCOPYD_WRITE_SEQ 2
struct dm_kcopyd_throttle { unsigned int throttle; unsigned int num_io_jobs; unsigned int io_period; unsigned int total_period; unsigned int last_jiffies;};
/* * kcopyd clients that want to support throttling must pass an initialised * dm_kcopyd_throttle struct into dm_kcopyd_client_create(). * Two or more clients may share the same instance of this struct between * them if they wish to be throttled as a group. * * This macro also creates a corresponding module parameter to configure * the amount of throttling. */#define DECLARE_DM_KCOPYD_THROTTLE_WITH_MODULE_PARM(name, description) \static struct dm_kcopyd_throttle dm_kcopyd_throttle = { 100, 0, 0, 0, 0 }; \module_param_named(name, dm_kcopyd_throttle.throttle, uint, 0644); \MODULE_PARM_DESC(name, description)
/* * To use kcopyd you must first create a dm_kcopyd_client object. * throttle can be NULL if you don't want any throttling. */struct dm_kcopyd_client;struct dm_kcopyd_client *dm_kcopyd_client_create(struct dm_kcopyd_throttle *throttle);void dm_kcopyd_client_destroy(struct dm_kcopyd_client *kc);void dm_kcopyd_client_flush(struct dm_kcopyd_client *kc);
/* * Submit a copy job to kcopyd. This is built on top of the * previous three fns. * * read_err is a boolean, * write_err is a bitset, with 1 bit for each destination region */typedef void (*dm_kcopyd_notify_fn)(int read_err, unsigned int long write_err, void *context);
void dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from, unsigned int num_dests, struct dm_io_region *dests, unsigned int flags, dm_kcopyd_notify_fn fn, void *context);
/* * Prepare a callback and submit it via the kcopyd thread. * * dm_kcopyd_prepare_callback allocates a callback structure and returns it. * It must not be called from interrupt context. * The returned value should be passed into dm_kcopyd_do_callback. * * dm_kcopyd_do_callback submits the callback. * It may be called from interrupt context. * The callback is issued from the kcopyd thread. */void *dm_kcopyd_prepare_callback(struct dm_kcopyd_client *kc, dm_kcopyd_notify_fn fn, void *context);void dm_kcopyd_do_callback(void *job, int read_err, unsigned int long write_err);
void dm_kcopyd_zero(struct dm_kcopyd_client *kc, unsigned int num_dests, struct dm_io_region *dests, unsigned int flags, dm_kcopyd_notify_fn fn, void *context);
#endif /* __KERNEL__ */#endif /* _LINUX_DM_KCOPYD_H */