| /* |
| * 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 long 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 |