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