1 /* 2 * Copyright (C) 2001 - 2003 Sistina Software 3 * Copyright (C) 2004 - 2008 Red Hat, Inc. All rights reserved. 4 * 5 * kcopyd provides a simple interface for copying an area of one 6 * block-device to one or more other block-devices, either synchronous 7 * or with an asynchronous completion notification. 8 * 9 * This file is released under the GPL. 10 */ 11 12 #ifndef _LINUX_DM_KCOPYD_H 13 #define _LINUX_DM_KCOPYD_H 14 15 #ifdef __KERNEL__ 16 17 #include <linux/dm-io.h> 18 19 /* FIXME: make this configurable */ 20 #define DM_KCOPYD_MAX_REGIONS 8 21 22 #define DM_KCOPYD_IGNORE_ERROR 1 23 24 /* 25 * To use kcopyd you must first create a dm_kcopyd_client object. 26 */ 27 struct dm_kcopyd_client; 28 int dm_kcopyd_client_create(unsigned num_pages, 29 struct dm_kcopyd_client **result); 30 void dm_kcopyd_client_destroy(struct dm_kcopyd_client *kc); 31 32 /* 33 * Submit a copy job to kcopyd. This is built on top of the 34 * previous three fns. 35 * 36 * read_err is a boolean, 37 * write_err is a bitset, with 1 bit for each destination region 38 */ 39 typedef void (*dm_kcopyd_notify_fn)(int read_err, unsigned long write_err, 40 void *context); 41 42 int dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from, 43 unsigned num_dests, struct dm_io_region *dests, 44 unsigned flags, dm_kcopyd_notify_fn fn, void *context); 45 46 #endif /* __KERNEL__ */ 47 #endif /* _LINUX_DM_KCOPYD_H */ 48