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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2004 Red Hat, Inc. All rights reserved. | |
3 | * | |
4 | * This file is released under the GPL. | |
5 | * | |
6 | * Multipath hardware handler registration. | |
7 | */ | |
8 | ||
9 | #ifndef DM_HW_HANDLER_H | |
10 | #define DM_HW_HANDLER_H | |
11 | ||
12 | #include <linux/device-mapper.h> | |
13 | ||
14 | #include "dm-mpath.h" | |
15 | ||
16 | struct hw_handler_type; | |
17 | struct hw_handler { | |
18 | struct hw_handler_type *type; | |
19 | void *context; | |
20 | }; | |
21 | ||
22 | /* | |
23 | * Constructs a hardware handler object, takes custom arguments | |
24 | */ | |
25 | /* Information about a hardware handler type */ | |
26 | struct hw_handler_type { | |
27 | char *name; | |
28 | struct module *module; | |
29 | ||
30 | int (*create) (struct hw_handler *handler, unsigned int argc, | |
31 | char **argv); | |
32 | void (*destroy) (struct hw_handler *hwh); | |
33 | ||
34 | void (*pg_init) (struct hw_handler *hwh, unsigned bypassed, | |
c922d5f7 | 35 | struct dm_path *path); |
1da177e4 LT |
36 | unsigned (*error) (struct hw_handler *hwh, struct bio *bio); |
37 | int (*status) (struct hw_handler *hwh, status_type_t type, | |
38 | char *result, unsigned int maxlen); | |
39 | }; | |
40 | ||
41 | /* Register a hardware handler */ | |
42 | int dm_register_hw_handler(struct hw_handler_type *type); | |
43 | ||
44 | /* Unregister a hardware handler */ | |
45 | int dm_unregister_hw_handler(struct hw_handler_type *type); | |
46 | ||
47 | /* Returns a registered hardware handler type */ | |
48 | struct hw_handler_type *dm_get_hw_handler(const char *name); | |
49 | ||
50 | /* Releases a hardware handler */ | |
51 | void dm_put_hw_handler(struct hw_handler_type *hwht); | |
52 | ||
53 | /* Default err function */ | |
54 | unsigned dm_scsi_err_handler(struct hw_handler *hwh, struct bio *bio); | |
55 | ||
56 | /* Error flags for err and dm_pg_init_complete */ | |
57 | #define MP_FAIL_PATH 1 | |
58 | #define MP_BYPASS_PG 2 | |
59 | #define MP_ERROR_IO 4 /* Don't retry this I/O */ | |
60 | ||
61 | #endif |