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https://github.com/torvalds/linux
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43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
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/*
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* Copyright (C) 2001 Sistina Software
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*
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* This file is released under the GPL.
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*
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* Kcopyd provides a simple interface for copying an area of one
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* block-device to one or more other block-devices, with an asynchronous
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* completion notification.
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*/
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#ifndef DM_KCOPYD_H
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#define DM_KCOPYD_H
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#include "dm-io.h"
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/* FIXME: make this configurable */
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#define KCOPYD_MAX_REGIONS 8
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#define KCOPYD_IGNORE_ERROR 1
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/*
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* To use kcopyd you must first create a kcopyd client object.
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*/
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struct kcopyd_client;
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int kcopyd_client_create(unsigned int num_pages, struct kcopyd_client **result);
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void kcopyd_client_destroy(struct kcopyd_client *kc);
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/*
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* Submit a copy job to kcopyd. This is built on top of the
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* previous three fns.
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*
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* read_err is a boolean,
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* write_err is a bitset, with 1 bit for each destination region
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*/
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typedef void (*kcopyd_notify_fn)(int read_err,
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unsigned int write_err, void *context);
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int kcopyd_copy(struct kcopyd_client *kc, struct io_region *from,
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unsigned int num_dests, struct io_region *dests,
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unsigned int flags, kcopyd_notify_fn fn, void *context);
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#endif
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