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 { 29 struct list_head list; 30 31 atomic_t count; 32 int mode; 33 struct block_device *bdev; 34 char name[16]; 35 }; 36 37 struct dm_table; 38 39 /*----------------------------------------------------------------- 40 * Internal table functions. 41 *---------------------------------------------------------------*/ 42 void dm_table_event_callback(struct dm_table *t, 43 void (*fn)(void *), void *context); 44 struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index); 45 struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector); 46 void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q); 47 struct list_head *dm_table_get_devices(struct dm_table *t); 48 void dm_table_presuspend_targets(struct dm_table *t); 49 void dm_table_postsuspend_targets(struct dm_table *t); 50 int dm_table_resume_targets(struct dm_table *t); 51 int dm_table_any_congested(struct dm_table *t, int bdi_bits); 52 void dm_table_unplug_all(struct dm_table *t); 53 54 /* 55 * To check the return value from dm_table_find_target(). 56 */ 57 #define dm_target_is_valid(t) ((t)->table) 58 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); 68 69 /*----------------------------------------------------------------- 70 * Useful inlines. 71 *---------------------------------------------------------------*/ 72 static inline int array_too_big(unsigned long fixed, unsigned long obj, 73 unsigned long num) 74 { 75 return (num > (ULONG_MAX - fixed) / obj); 76 } 77 78 int dm_split_args(int *argc, char ***argvp, char *input); 79 80 /* 81 * The device-mapper can be driven through one of two interfaces; 82 * ioctl or filesystem, depending which patch you have applied. 83 */ 84 int dm_interface_init(void); 85 void dm_interface_exit(void); 86 87 /* 88 * Targets for linear and striped mappings 89 */ 90 int dm_linear_init(void); 91 void dm_linear_exit(void); 92 93 int dm_stripe_init(void); 94 void dm_stripe_exit(void); 95 96 void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size); 97 union map_info *dm_get_mapinfo(struct bio *bio); 98 int dm_open_count(struct mapped_device *md); 99 int dm_lock_for_deletion(struct mapped_device *md); 100 101 void dm_kobject_uevent(struct mapped_device *md); 102 103 int dm_kcopyd_init(void); 104 void dm_kcopyd_exit(void); 105 106 #endif 107