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 int dm_calculate_queue_limits(struct dm_table *table, 58 struct queue_limits *limits); 59 void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, 60 struct queue_limits *limits); 61 struct list_head *dm_table_get_devices(struct dm_table *t); 62 void dm_table_presuspend_targets(struct dm_table *t); 63 void dm_table_postsuspend_targets(struct dm_table *t); 64 int dm_table_resume_targets(struct dm_table *t); 65 int dm_table_any_congested(struct dm_table *t, int bdi_bits); 66 int dm_table_any_busy_target(struct dm_table *t); 67 unsigned dm_table_get_type(struct dm_table *t); 68 struct target_type *dm_table_get_immutable_target_type(struct dm_table *t); 69 bool dm_table_request_based(struct dm_table *t); 70 bool dm_table_supports_discards(struct dm_table *t); 71 int dm_table_alloc_md_mempools(struct dm_table *t); 72 void dm_table_free_md_mempools(struct dm_table *t); 73 struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t); 74 75 int dm_queue_merge_is_compulsory(struct request_queue *q); 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, unsigned type); 80 unsigned 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); 84 85 /* 86 * To check the return value from dm_table_find_target(). 87 */ 88 #define dm_target_is_valid(t) ((t)->table) 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->map_rq != NULL) 94 95 /*----------------------------------------------------------------- 96 * A registry of target types. 97 *---------------------------------------------------------------*/ 98 int dm_target_init(void); 99 void dm_target_exit(void); 100 struct target_type *dm_get_target_type(const char *name); 101 void dm_put_target_type(struct target_type *tt); 102 int dm_target_iterate(void (*iter_func)(struct target_type *tt, 103 void *param), void *param); 104 105 int dm_split_args(int *argc, char ***argvp, char *input); 106 107 /* 108 * Is this mapped_device being deleted? 109 */ 110 int dm_deleting_md(struct mapped_device *md); 111 112 /* 113 * Is this mapped_device suspended? 114 */ 115 int dm_suspended_md(struct mapped_device *md); 116 117 /* 118 * The device-mapper can be driven through one of two interfaces; 119 * ioctl or filesystem, depending which patch you have applied. 120 */ 121 int dm_interface_init(void); 122 void dm_interface_exit(void); 123 124 /* 125 * sysfs interface 126 */ 127 int dm_sysfs_init(struct mapped_device *md); 128 void dm_sysfs_exit(struct mapped_device *md); 129 struct kobject *dm_kobject(struct mapped_device *md); 130 struct mapped_device *dm_get_from_kobject(struct kobject *kobj); 131 132 /* 133 * Targets for linear and striped mappings 134 */ 135 int dm_linear_init(void); 136 void dm_linear_exit(void); 137 138 int dm_stripe_init(void); 139 void dm_stripe_exit(void); 140 141 /* 142 * mapped_device operations 143 */ 144 void dm_destroy(struct mapped_device *md); 145 void dm_destroy_immediate(struct mapped_device *md); 146 int dm_open_count(struct mapped_device *md); 147 int dm_lock_for_deletion(struct mapped_device *md); 148 149 int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action, 150 unsigned cookie); 151 152 int dm_io_init(void); 153 void dm_io_exit(void); 154 155 int dm_kcopyd_init(void); 156 void dm_kcopyd_exit(void); 157 158 /* 159 * Mempool operations 160 */ 161 struct dm_md_mempools *dm_alloc_md_mempools(unsigned type, unsigned integrity); 162 void dm_free_md_mempools(struct dm_md_mempools *pools); 163 164 #endif 165