| /* | |
| * Copyright (C) 2001 Sistina Software | |
| * | |
| * This file is released under the GPL. | |
| * | |
| * Kcopyd provides a simple interface for copying an area of one | |
| * block-device to one or more other block-devices, with an asynchronous | |
| * completion notification. | |
| */ | |
| #ifndef DM_KCOPYD_H | |
| #define DM_KCOPYD_H | |
| #include "dm-io.h" | |
| /* FIXME: make this configurable */ | |
| #define KCOPYD_MAX_REGIONS 8 | |
| #define KCOPYD_IGNORE_ERROR 1 | |
| /* | |
| * To use kcopyd you must first create a kcopyd client object. | |
| */ | |
| struct kcopyd_client; | |
| int kcopyd_client_create(unsigned int num_pages, struct kcopyd_client **result); | |
| void kcopyd_client_destroy(struct 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 (*kcopyd_notify_fn)(int read_err, | |
| unsigned int write_err, void *context); | |
| int kcopyd_copy(struct kcopyd_client *kc, struct io_region *from, | |
| unsigned int num_dests, struct io_region *dests, | |
| unsigned int flags, kcopyd_notify_fn fn, void *context); | |
| #endif |