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 * Status feature flags 27 */ 28 #define DM_STATUS_NOFLUSH_FLAG (1 << 0) 29 30 /* 31 * Type of table and mapped_device's mempool 32 */ 33 #define DM_TYPE_NONE 0 34 #define DM_TYPE_BIO_BASED 1 35 #define DM_TYPE_REQUEST_BASED 2 36 37 /* 38 * List of devices that a metadevice uses and should open/close. 39 */ 40 struct dm_dev_internal { 41 struct list_head list; 42 atomic_t count; 43 struct dm_dev dm_dev; 44 }; 45 46 struct dm_table; 47 struct dm_md_mempools; 48 49 /*----------------------------------------------------------------- 50 * Internal table functions. 51 *---------------------------------------------------------------*/ 52 void dm_table_destroy(struct dm_table *t); 53 void dm_table_event_callback(struct dm_table *t, 54 void (*fn)(void *), void *context); 55 struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index); 56 struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector); 57 bool dm_table_has_no_data_devices(struct dm_table *table); 58 int dm_calculate_queue_limits(struct dm_table *table, 59 struct queue_limits *limits); 60 void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, 61 struct queue_limits *limits); 62 struct list_head *dm_table_get_devices(struct dm_table *t); 63 void dm_table_presuspend_targets(struct dm_table *t); 64 void dm_table_postsuspend_targets(struct dm_table *t); 65 int dm_table_resume_targets(struct dm_table *t); 66 int dm_table_any_congested(struct dm_table *t, int bdi_bits); 67 int dm_table_any_busy_target(struct dm_table *t); 68 unsigned dm_table_get_type(struct dm_table *t); 69 struct target_type *dm_table_get_immutable_target_type(struct dm_table *t); 70 bool dm_table_request_based(struct dm_table *t); 71 bool dm_table_supports_discards(struct dm_table *t); 72 int dm_table_alloc_md_mempools(struct dm_table *t); 73 void dm_table_free_md_mempools(struct dm_table *t); 74 struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t); 75 76 int dm_queue_merge_is_compulsory(struct request_queue *q); 77 78 void dm_lock_md_type(struct mapped_device *md); 79 void dm_unlock_md_type(struct mapped_device *md); 80 void dm_set_md_type(struct mapped_device *md, unsigned type); 81 unsigned dm_get_md_type(struct mapped_device *md); 82 struct target_type *dm_get_immutable_target_type(struct mapped_device *md); 83 84 int dm_setup_md_queue(struct mapped_device *md); 85 86 /* 87 * To check the return value from dm_table_find_target(). 88 */ 89 #define dm_target_is_valid(t) ((t)->table) 90 91 /* 92 * To check whether the target type is request-based or not (bio-based). 93 */ 94 #define dm_target_request_based(t) ((t)->type->map_rq != NULL) 95 96 /*----------------------------------------------------------------- 97 * A registry of target types. 98 *---------------------------------------------------------------*/ 99 int dm_target_init(void); 100 void dm_target_exit(void); 101 struct target_type *dm_get_target_type(const char *name); 102 void dm_put_target_type(struct target_type *tt); 103 int dm_target_iterate(void (*iter_func)(struct target_type *tt, 104 void *param), void *param); 105 106 int dm_split_args(int *argc, char ***argvp, char *input); 107 108 /* 109 * Is this mapped_device being deleted? 110 */ 111 int dm_deleting_md(struct mapped_device *md); 112 113 /* 114 * Is this mapped_device suspended? 115 */ 116 int dm_suspended_md(struct mapped_device *md); 117 118 /* 119 * The device-mapper can be driven through one of two interfaces; 120 * ioctl or filesystem, depending which patch you have applied. 121 */ 122 int dm_interface_init(void); 123 void dm_interface_exit(void); 124 125 /* 126 * sysfs interface 127 */ 128 int dm_sysfs_init(struct mapped_device *md); 129 void dm_sysfs_exit(struct mapped_device *md); 130 struct kobject *dm_kobject(struct mapped_device *md); 131 struct mapped_device *dm_get_from_kobject(struct kobject *kobj); 132 133 /* 134 * Targets for linear and striped mappings 135 */ 136 int dm_linear_init(void); 137 void dm_linear_exit(void); 138 139 int dm_stripe_init(void); 140 void dm_stripe_exit(void); 141 142 /* 143 * mapped_device operations 144 */ 145 void dm_destroy(struct mapped_device *md); 146 void dm_destroy_immediate(struct mapped_device *md); 147 int dm_open_count(struct mapped_device *md); 148 int dm_lock_for_deletion(struct mapped_device *md); 149 150 int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action, 151 unsigned cookie); 152 153 int dm_io_init(void); 154 void dm_io_exit(void); 155 156 int dm_kcopyd_init(void); 157 void dm_kcopyd_exit(void); 158 159 /* 160 * Mempool operations 161 */ 162 struct dm_md_mempools *dm_alloc_md_mempools(unsigned type, unsigned integrity); 163 void dm_free_md_mempools(struct dm_md_mempools *pools); 164 165 #endif 166