2 * Internal header file for device mapper
4 * Copyright (C) 2001, 2002 Sistina Software
5 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
7 * This file is released under the LGPL.
14 #include <linux/device-mapper.h>
15 #include <linux/list.h>
16 #include <linux/blkdev.h>
17 #include <linux/hdreg.h>
19 #define DM_NAME "device-mapper"
20 #define DMWARN(f, x...) printk(KERN_WARNING DM_NAME ": " f "\n" , ## x)
21 #define DMERR(f, x...) printk(KERN_ERR DM_NAME ": " f "\n" , ## x)
22 #define DMINFO(f, x...) printk(KERN_INFO DM_NAME ": " f "\n" , ## x)
24 #define DMEMIT(x...) sz += ((sz >= maxlen) ? \
25 0 : scnprintf(result + sz, maxlen - sz, x))
27 #define SECTOR_SHIFT 9
30 * List of devices that a metadevice uses and should open/close.
33 struct list_head list;
37 struct block_device *bdev;
43 /*-----------------------------------------------------------------
44 * Internal table functions.
45 *---------------------------------------------------------------*/
46 void dm_table_event_callback(struct dm_table *t,
47 void (*fn)(void *), void *context);
48 struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index);
49 struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
50 void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q);
51 struct list_head *dm_table_get_devices(struct dm_table *t);
52 void dm_table_presuspend_targets(struct dm_table *t);
53 void dm_table_postsuspend_targets(struct dm_table *t);
54 void dm_table_resume_targets(struct dm_table *t);
55 int dm_table_any_congested(struct dm_table *t, int bdi_bits);
56 void dm_table_unplug_all(struct dm_table *t);
57 int dm_table_flush_all(struct dm_table *t);
59 /*-----------------------------------------------------------------
60 * A registry of target types.
61 *---------------------------------------------------------------*/
62 int dm_target_init(void);
63 void dm_target_exit(void);
64 struct target_type *dm_get_target_type(const char *name);
65 void dm_put_target_type(struct target_type *t);
66 int dm_target_iterate(void (*iter_func)(struct target_type *tt,
67 void *param), void *param);
69 /*-----------------------------------------------------------------
71 *---------------------------------------------------------------*/
72 static inline int array_too_big(unsigned long fixed, unsigned long obj,
75 return (num > (ULONG_MAX - fixed) / obj);
81 #define dm_div_up(n, sz) (((n) + (sz) - 1) / (sz))
83 #define dm_sector_div_up(n, sz) ( \
85 sector_t _r = ((n) + (sz) - 1); \
86 sector_div(_r, (sz)); \
92 * ceiling(n / size) * size
94 #define dm_round_up(n, sz) (dm_div_up((n), (sz)) * (sz))
96 static inline sector_t to_sector(unsigned long n)
101 static inline unsigned long to_bytes(sector_t n)
106 int dm_split_args(int *argc, char ***argvp, char *input);
109 * The device-mapper can be driven through one of two interfaces;
110 * ioctl or filesystem, depending which patch you have applied.
112 int dm_interface_init(void);
113 void dm_interface_exit(void);
116 * Targets for linear and striped mappings
118 int dm_linear_init(void);
119 void dm_linear_exit(void);
121 int dm_stripe_init(void);
122 void dm_stripe_exit(void);
124 void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
125 union map_info *dm_get_mapinfo(struct bio *bio);