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89 lines
2.9 KiB
89 lines
2.9 KiB
/* |
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* Copyright (C) 2001 - 2003 Sistina Software |
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* Copyright (C) 2004 - 2008 Red Hat, Inc. All rights reserved. |
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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, either synchronous |
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* or with an asynchronous completion notification. |
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* |
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* This file is released under the GPL. |
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*/ |
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#ifndef _LINUX_DM_KCOPYD_H |
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#define _LINUX_DM_KCOPYD_H |
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#ifdef __KERNEL__ |
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#include <linux/dm-io.h> |
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/* FIXME: make this configurable */ |
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#define DM_KCOPYD_MAX_REGIONS 8 |
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#define DM_KCOPYD_IGNORE_ERROR 1 |
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#define DM_KCOPYD_WRITE_SEQ 2 |
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struct dm_kcopyd_throttle { |
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unsigned throttle; |
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unsigned num_io_jobs; |
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unsigned io_period; |
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unsigned total_period; |
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unsigned last_jiffies; |
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}; |
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/* |
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* kcopyd clients that want to support throttling must pass an initialised |
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* dm_kcopyd_throttle struct into dm_kcopyd_client_create(). |
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* Two or more clients may share the same instance of this struct between |
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* them if they wish to be throttled as a group. |
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* |
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* This macro also creates a corresponding module parameter to configure |
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* the amount of throttling. |
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*/ |
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#define DECLARE_DM_KCOPYD_THROTTLE_WITH_MODULE_PARM(name, description) \ |
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static struct dm_kcopyd_throttle dm_kcopyd_throttle = { 100, 0, 0, 0, 0 }; \ |
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module_param_named(name, dm_kcopyd_throttle.throttle, uint, 0644); \ |
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MODULE_PARM_DESC(name, description) |
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/* |
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* To use kcopyd you must first create a dm_kcopyd_client object. |
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* throttle can be NULL if you don't want any throttling. |
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*/ |
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struct dm_kcopyd_client; |
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struct dm_kcopyd_client *dm_kcopyd_client_create(struct dm_kcopyd_throttle *throttle); |
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void dm_kcopyd_client_destroy(struct dm_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 (*dm_kcopyd_notify_fn)(int read_err, unsigned long write_err, |
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void *context); |
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void dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from, |
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unsigned num_dests, struct dm_io_region *dests, |
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unsigned flags, dm_kcopyd_notify_fn fn, void *context); |
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/* |
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* Prepare a callback and submit it via the kcopyd thread. |
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* |
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* dm_kcopyd_prepare_callback allocates a callback structure and returns it. |
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* It must not be called from interrupt context. |
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* The returned value should be passed into dm_kcopyd_do_callback. |
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* |
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* dm_kcopyd_do_callback submits the callback. |
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* It may be called from interrupt context. |
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* The callback is issued from the kcopyd thread. |
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*/ |
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void *dm_kcopyd_prepare_callback(struct dm_kcopyd_client *kc, |
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dm_kcopyd_notify_fn fn, void *context); |
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void dm_kcopyd_do_callback(void *job, int read_err, unsigned long write_err); |
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void dm_kcopyd_zero(struct dm_kcopyd_client *kc, |
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unsigned num_dests, struct dm_io_region *dests, |
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unsigned flags, dm_kcopyd_notify_fn fn, void *context); |
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#endif /* __KERNEL__ */ |
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#endif /* _LINUX_DM_KCOPYD_H */
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