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/moduleparam.h> 17 #include <linux/blkdev.h> 18 #include <linux/backing-dev.h> 19 #include <linux/hdreg.h> 20 #include <linux/completion.h> 21 #include <linux/kobject.h> 22 #include <linux/refcount.h> 23 24 #include "dm-stats.h" 25 26 /* 27 * Suspend feature flags 28 */ 29 #define DM_SUSPEND_LOCKFS_FLAG (1 << 0) 30 #define DM_SUSPEND_NOFLUSH_FLAG (1 << 1) 31 32 /* 33 * Status feature flags 34 */ 35 #define DM_STATUS_NOFLUSH_FLAG (1 << 0) 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 refcount_t count; 43 struct dm_dev *dm_dev; 44 }; 45 46 struct dm_table; 47 struct dm_md_mempools; 48 struct dm_target_io; 49 struct dm_io; 50 51 /*----------------------------------------------------------------- 52 * Internal table functions. 53 *---------------------------------------------------------------*/ 54 void dm_table_event_callback(struct dm_table *t, 55 void (*fn)(void *), void *context); 56 struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index); 57 struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector); 58 bool dm_table_has_no_data_devices(struct dm_table *table); 59 int dm_calculate_queue_limits(struct dm_table *table, 60 struct queue_limits *limits); 61 int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, 62 struct queue_limits *limits); 63 struct list_head *dm_table_get_devices(struct dm_table *t); 64 void dm_table_presuspend_targets(struct dm_table *t); 65 void dm_table_presuspend_undo_targets(struct dm_table *t); 66 void dm_table_postsuspend_targets(struct dm_table *t); 67 int dm_table_resume_targets(struct dm_table *t); 68 enum dm_queue_mode dm_table_get_type(struct dm_table *t); 69 struct target_type *dm_table_get_immutable_target_type(struct dm_table *t); 70 struct dm_target *dm_table_get_immutable_target(struct dm_table *t); 71 struct dm_target *dm_table_get_wildcard_target(struct dm_table *t); 72 bool dm_table_bio_based(struct dm_table *t); 73 bool dm_table_request_based(struct dm_table *t); 74 void dm_table_free_md_mempools(struct dm_table *t); 75 struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t); 76 77 void dm_lock_md_type(struct mapped_device *md); 78 void dm_unlock_md_type(struct mapped_device *md); 79 void dm_set_md_type(struct mapped_device *md, enum dm_queue_mode type); 80 enum dm_queue_mode dm_get_md_type(struct mapped_device *md); 81 struct target_type *dm_get_immutable_target_type(struct mapped_device *md); 82 83 int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t); 84 85 /* 86 * To check whether the target type is bio-based or not (request-based). 87 */ 88 #define dm_target_bio_based(t) ((t)->type->map != NULL) 89 90 /* 91 * To check whether the target type is request-based or not (bio-based). 92 */ 93 #define dm_target_request_based(t) ((t)->type->clone_and_map_rq != NULL) 94 95 /* 96 * To check whether the target type is a hybrid (capable of being 97 * either request-based or bio-based). 98 */ 99 #define dm_target_hybrid(t) (dm_target_bio_based(t) && dm_target_request_based(t)) 100 101 /* 102 * Zoned targets related functions. 103 */ 104 int dm_set_zones_restrictions(struct dm_table *t, struct request_queue *q); 105 void dm_zone_endio(struct dm_io *io, struct bio *clone); 106 #ifdef CONFIG_BLK_DEV_ZONED 107 void dm_cleanup_zoned_dev(struct mapped_device *md); 108 int dm_blk_report_zones(struct gendisk *disk, sector_t sector, 109 unsigned int nr_zones, report_zones_cb cb, void *data); 110 bool dm_is_zone_write(struct mapped_device *md, struct bio *bio); 111 int dm_zone_map_bio(struct dm_target_io *io); 112 #else 113 static inline void dm_cleanup_zoned_dev(struct mapped_device *md) {} 114 #define dm_blk_report_zones NULL 115 static inline bool dm_is_zone_write(struct mapped_device *md, struct bio *bio) 116 { 117 return false; 118 } 119 static inline int dm_zone_map_bio(struct dm_target_io *tio) 120 { 121 return DM_MAPIO_KILL; 122 } 123 #endif 124 125 /*----------------------------------------------------------------- 126 * A registry of target types. 127 *---------------------------------------------------------------*/ 128 int dm_target_init(void); 129 void dm_target_exit(void); 130 struct target_type *dm_get_target_type(const char *name); 131 void dm_put_target_type(struct target_type *tt); 132 int dm_target_iterate(void (*iter_func)(struct target_type *tt, 133 void *param), void *param); 134 135 int dm_split_args(int *argc, char ***argvp, char *input); 136 137 /* 138 * Is this mapped_device being deleted? 139 */ 140 int dm_deleting_md(struct mapped_device *md); 141 142 /* 143 * Is this mapped_device suspended? 144 */ 145 int dm_suspended_md(struct mapped_device *md); 146 147 /* 148 * Internal suspend and resume methods. 149 */ 150 int dm_suspended_internally_md(struct mapped_device *md); 151 void dm_internal_suspend_fast(struct mapped_device *md); 152 void dm_internal_resume_fast(struct mapped_device *md); 153 void dm_internal_suspend_noflush(struct mapped_device *md); 154 void dm_internal_resume(struct mapped_device *md); 155 156 /* 157 * Test if the device is scheduled for deferred remove. 158 */ 159 int dm_test_deferred_remove_flag(struct mapped_device *md); 160 161 /* 162 * Try to remove devices marked for deferred removal. 163 */ 164 void dm_deferred_remove(void); 165 166 /* 167 * The device-mapper can be driven through one of two interfaces; 168 * ioctl or filesystem, depending which patch you have applied. 169 */ 170 int dm_interface_init(void); 171 void dm_interface_exit(void); 172 173 /* 174 * sysfs interface 175 */ 176 int dm_sysfs_init(struct mapped_device *md); 177 void dm_sysfs_exit(struct mapped_device *md); 178 struct kobject *dm_kobject(struct mapped_device *md); 179 struct mapped_device *dm_get_from_kobject(struct kobject *kobj); 180 181 /* 182 * The kobject helper 183 */ 184 void dm_kobject_release(struct kobject *kobj); 185 186 /* 187 * Targets for linear and striped mappings 188 */ 189 int dm_linear_init(void); 190 void dm_linear_exit(void); 191 192 int dm_stripe_init(void); 193 void dm_stripe_exit(void); 194 195 /* 196 * mapped_device operations 197 */ 198 void dm_destroy(struct mapped_device *md); 199 void dm_destroy_immediate(struct mapped_device *md); 200 int dm_open_count(struct mapped_device *md); 201 int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred); 202 int dm_cancel_deferred_remove(struct mapped_device *md); 203 int dm_request_based(struct mapped_device *md); 204 int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode, 205 struct dm_dev **result); 206 void dm_put_table_device(struct mapped_device *md, struct dm_dev *d); 207 208 int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action, 209 unsigned cookie); 210 211 void dm_internal_suspend(struct mapped_device *md); 212 void dm_internal_resume(struct mapped_device *md); 213 214 int dm_io_init(void); 215 void dm_io_exit(void); 216 217 int dm_kcopyd_init(void); 218 void dm_kcopyd_exit(void); 219 220 /* 221 * Mempool operations 222 */ 223 struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, enum dm_queue_mode type, 224 unsigned integrity, unsigned per_bio_data_size, 225 unsigned min_pool_size); 226 void dm_free_md_mempools(struct dm_md_mempools *pools); 227 228 /* 229 * Various helpers 230 */ 231 unsigned dm_get_reserved_bio_based_ios(void); 232 233 #endif 234