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 int dm_table_set_type(struct dm_table *t); 63 unsigned dm_table_get_type(struct dm_table *t); 64 bool dm_table_request_based(struct dm_table *t); 65 int dm_table_alloc_md_mempools(struct dm_table *t); 66 void dm_table_free_md_mempools(struct dm_table *t); 67 struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t); 68 69 /* 70 * To check the return value from dm_table_find_target(). 71 */ 72 #define dm_target_is_valid(t) ((t)->table) 73 74 /* 75 * To check whether the target type is request-based or not (bio-based). 76 */ 77 #define dm_target_request_based(t) ((t)->type->map_rq != NULL) 78 79 /*----------------------------------------------------------------- 80 * A registry of target types. 81 *---------------------------------------------------------------*/ 82 int dm_target_init(void); 83 void dm_target_exit(void); 84 struct target_type *dm_get_target_type(const char *name); 85 void dm_put_target_type(struct target_type *tt); 86 int dm_target_iterate(void (*iter_func)(struct target_type *tt, 87 void *param), void *param); 88 89 int dm_split_args(int *argc, char ***argvp, char *input); 90 91 /* 92 * Is this mapped_device being deleted? 93 */ 94 int dm_deleting_md(struct mapped_device *md); 95 96 /* 97 * Is this mapped_device suspended? 98 */ 99 int dm_suspended_md(struct mapped_device *md); 100 101 /* 102 * The device-mapper can be driven through one of two interfaces; 103 * ioctl or filesystem, depending which patch you have applied. 104 */ 105 int dm_interface_init(void); 106 void dm_interface_exit(void); 107 108 /* 109 * sysfs interface 110 */ 111 int dm_sysfs_init(struct mapped_device *md); 112 void dm_sysfs_exit(struct mapped_device *md); 113 struct kobject *dm_kobject(struct mapped_device *md); 114 struct mapped_device *dm_get_from_kobject(struct kobject *kobj); 115 116 /* 117 * Targets for linear and striped mappings 118 */ 119 int dm_linear_init(void); 120 void dm_linear_exit(void); 121 122 int dm_stripe_init(void); 123 void dm_stripe_exit(void); 124 125 int dm_open_count(struct mapped_device *md); 126 int dm_lock_for_deletion(struct mapped_device *md); 127 128 void dm_kobject_uevent(struct mapped_device *md, enum kobject_action action, 129 unsigned cookie); 130 131 int dm_io_init(void); 132 void dm_io_exit(void); 133 134 int dm_kcopyd_init(void); 135 void dm_kcopyd_exit(void); 136 137 /* 138 * Mempool operations 139 */ 140 struct dm_md_mempools *dm_alloc_md_mempools(unsigned type); 141 void dm_free_md_mempools(struct dm_md_mempools *pools); 142 143 #endif 144