Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Internal header file for device mapper |
| 3 | * |
| 4 | * Copyright (C) 2001, 2002 Sistina Software |
Alasdair G Kergon | 2b06cff | 2006-06-26 00:27:32 -0700 | [diff] [blame] | 5 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Darrick J. Wong | 3ac51e7 | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 17 | #include <linux/hdreg.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | |
Kiyoshi Ueda | 45cbcd7 | 2006-12-08 02:41:05 -0800 | [diff] [blame] | 19 | /* |
Kiyoshi Ueda | a3d77d3 | 2006-12-08 02:41:04 -0800 | [diff] [blame] | 20 | * Suspend feature flags |
| 21 | */ |
| 22 | #define DM_SUSPEND_LOCKFS_FLAG (1 << 0) |
Kiyoshi Ueda | 81fdb09 | 2006-12-08 02:41:07 -0800 | [diff] [blame] | 23 | #define DM_SUSPEND_NOFLUSH_FLAG (1 << 1) |
Kiyoshi Ueda | a3d77d3 | 2006-12-08 02:41:04 -0800 | [diff] [blame] | 24 | |
| 25 | /* |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame^] | 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 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | * List of devices that a metadevice uses and should open/close. |
| 34 | */ |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 35 | struct dm_dev_internal { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | struct list_head list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | atomic_t count; |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 38 | struct dm_dev dm_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | }; |
| 40 | |
| 41 | struct dm_table; |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame^] | 42 | struct dm_md_mempools; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
| 44 | /*----------------------------------------------------------------- |
Alasdair G Kergon | 17b2f66 | 2006-06-26 00:27:33 -0700 | [diff] [blame] | 45 | * Internal table functions. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | *---------------------------------------------------------------*/ |
Mikulas Patocka | d581687 | 2009-01-06 03:05:10 +0000 | [diff] [blame] | 47 | void dm_table_destroy(struct dm_table *t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | void dm_table_event_callback(struct dm_table *t, |
| 49 | void (*fn)(void *), void *context); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 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); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | struct list_head *dm_table_get_devices(struct dm_table *t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | void dm_table_presuspend_targets(struct dm_table *t); |
| 58 | void dm_table_postsuspend_targets(struct dm_table *t); |
Milan Broz | 8757b77 | 2006-10-03 01:15:36 -0700 | [diff] [blame] | 59 | int dm_table_resume_targets(struct dm_table *t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | int dm_table_any_congested(struct dm_table *t, int bdi_bits); |
Kiyoshi Ueda | cec47e3 | 2009-06-22 10:12:35 +0100 | [diff] [blame] | 61 | int dm_table_any_busy_target(struct dm_table *t); |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame^] | 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); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
Jun'ichi Nomura | 512875b | 2007-12-13 14:15:25 +0000 | [diff] [blame] | 69 | /* |
| 70 | * To check the return value from dm_table_find_target(). |
| 71 | */ |
| 72 | #define dm_target_is_valid(t) ((t)->table) |
| 73 | |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame^] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Cheng Renquan | 45194e4 | 2009-04-02 19:55:28 +0100 | [diff] [blame] | 85 | void dm_put_target_type(struct target_type *tt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | int dm_target_iterate(void (*iter_func)(struct target_type *tt, |
| 87 | void *param), void *param); |
| 88 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | int dm_split_args(int *argc, char ***argvp, char *input); |
| 90 | |
| 91 | /* |
| 92 | * The device-mapper can be driven through one of two interfaces; |
| 93 | * ioctl or filesystem, depending which patch you have applied. |
| 94 | */ |
| 95 | int dm_interface_init(void); |
| 96 | void dm_interface_exit(void); |
| 97 | |
| 98 | /* |
Milan Broz | 784aae7 | 2009-01-06 03:05:12 +0000 | [diff] [blame] | 99 | * sysfs interface |
| 100 | */ |
| 101 | int dm_sysfs_init(struct mapped_device *md); |
| 102 | void dm_sysfs_exit(struct mapped_device *md); |
| 103 | struct kobject *dm_kobject(struct mapped_device *md); |
| 104 | struct mapped_device *dm_get_from_kobject(struct kobject *kobj); |
| 105 | |
| 106 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | * Targets for linear and striped mappings |
| 108 | */ |
| 109 | int dm_linear_init(void); |
| 110 | void dm_linear_exit(void); |
| 111 | |
| 112 | int dm_stripe_init(void); |
| 113 | void dm_stripe_exit(void); |
| 114 | |
Alasdair G Kergon | 5c6bd75 | 2006-06-26 00:27:34 -0700 | [diff] [blame] | 115 | int dm_open_count(struct mapped_device *md); |
| 116 | int dm_lock_for_deletion(struct mapped_device *md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | |
Milan Broz | 60935eb | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 118 | void dm_kobject_uevent(struct mapped_device *md, enum kobject_action action, |
| 119 | unsigned cookie); |
Alasdair G Kergon | 69267a3 | 2007-12-13 14:15:57 +0000 | [diff] [blame] | 120 | |
Mikulas Patocka | 945fa4d | 2008-04-24 21:43:49 +0100 | [diff] [blame] | 121 | int dm_kcopyd_init(void); |
| 122 | void dm_kcopyd_exit(void); |
| 123 | |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame^] | 124 | /* |
| 125 | * Mempool operations |
| 126 | */ |
| 127 | struct dm_md_mempools *dm_alloc_md_mempools(unsigned type); |
| 128 | void dm_free_md_mempools(struct dm_md_mempools *pools); |
| 129 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | #endif |