PCI: use %pF instead of print_fn_descriptor_symbol() in quirks.c
[deliverable/linux.git] / drivers / md / dm.h
1 /*
2 * Internal header file for device mapper
3 *
4 * Copyright (C) 2001, 2002 Sistina Software
5 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
6 *
7 * This file is released under the LGPL.
8 */
9
10 #ifndef DM_INTERNAL_H
11 #define DM_INTERNAL_H
12
13 #include <linux/fs.h>
14 #include <linux/device-mapper.h>
15 #include <linux/list.h>
16 #include <linux/blkdev.h>
17 #include <linux/hdreg.h>
18
19 /*
20 * Suspend feature flags
21 */
22 #define DM_SUSPEND_LOCKFS_FLAG (1 << 0)
23 #define DM_SUSPEND_NOFLUSH_FLAG (1 << 1)
24
25 /*
26 * List of devices that a metadevice uses and should open/close.
27 */
28 struct dm_dev_internal {
29 struct list_head list;
30 atomic_t count;
31 struct dm_dev dm_dev;
32 };
33
34 struct dm_table;
35
36 /*-----------------------------------------------------------------
37 * Internal table functions.
38 *---------------------------------------------------------------*/
39 void dm_table_event_callback(struct dm_table *t,
40 void (*fn)(void *), void *context);
41 struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index);
42 struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
43 void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q);
44 struct list_head *dm_table_get_devices(struct dm_table *t);
45 void dm_table_presuspend_targets(struct dm_table *t);
46 void dm_table_postsuspend_targets(struct dm_table *t);
47 int dm_table_resume_targets(struct dm_table *t);
48 int dm_table_any_congested(struct dm_table *t, int bdi_bits);
49
50 /*
51 * To check the return value from dm_table_find_target().
52 */
53 #define dm_target_is_valid(t) ((t)->table)
54
55 /*-----------------------------------------------------------------
56 * A registry of target types.
57 *---------------------------------------------------------------*/
58 int dm_target_init(void);
59 void dm_target_exit(void);
60 struct target_type *dm_get_target_type(const char *name);
61 void dm_put_target_type(struct target_type *t);
62 int dm_target_iterate(void (*iter_func)(struct target_type *tt,
63 void *param), void *param);
64
65 /*-----------------------------------------------------------------
66 * Useful inlines.
67 *---------------------------------------------------------------*/
68 static inline int array_too_big(unsigned long fixed, unsigned long obj,
69 unsigned long num)
70 {
71 return (num > (ULONG_MAX - fixed) / obj);
72 }
73
74 int dm_split_args(int *argc, char ***argvp, char *input);
75
76 /*
77 * The device-mapper can be driven through one of two interfaces;
78 * ioctl or filesystem, depending which patch you have applied.
79 */
80 int dm_interface_init(void);
81 void dm_interface_exit(void);
82
83 /*
84 * Targets for linear and striped mappings
85 */
86 int dm_linear_init(void);
87 void dm_linear_exit(void);
88
89 int dm_stripe_init(void);
90 void dm_stripe_exit(void);
91
92 int dm_open_count(struct mapped_device *md);
93 int dm_lock_for_deletion(struct mapped_device *md);
94
95 void dm_kobject_uevent(struct mapped_device *md);
96
97 int dm_kcopyd_init(void);
98 void dm_kcopyd_exit(void);
99
100 #endif
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