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 * List of devices that a metadevice uses and should open/close. 27 */ 28 struct dm_dev_internal { 29 struct list_head list; 30 atomic_t count; 31 struct dm_dev dm_dev; 32 }; 33 34 struct dm_table; 35 36 /*----------------------------------------------------------------- 37 * Internal table functions. 38 *---------------------------------------------------------------*/ 39 void dm_table_destroy(struct dm_table *t); 40 void dm_table_event_callback(struct dm_table *t, 41 void (*fn)(void *), void *context); 42 struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index); 43 struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector); 44 void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q); 45 struct list_head *dm_table_get_devices(struct dm_table *t); 46 void dm_table_presuspend_targets(struct dm_table *t); 47 void dm_table_postsuspend_targets(struct dm_table *t); 48 int dm_table_resume_targets(struct dm_table *t); 49 int dm_table_any_congested(struct dm_table *t, int bdi_bits); 50 51 /* 52 * To check the return value from dm_table_find_target(). 53 */ 54 #define dm_target_is_valid(t) ((t)->table) 55 int dm_table_barrier_ok(struct dm_table *t); 56 57 /*----------------------------------------------------------------- 58 * A registry of target types. 59 *---------------------------------------------------------------*/ 60 int dm_target_init(void); 61 void dm_target_exit(void); 62 struct target_type *dm_get_target_type(const char *name); 63 void dm_put_target_type(struct target_type *t); 64 int dm_target_iterate(void (*iter_func)(struct target_type *tt, 65 void *param), void *param); 66 67 int dm_split_args(int *argc, char ***argvp, char *input); 68 69 /* 70 * The device-mapper can be driven through one of two interfaces; 71 * ioctl or filesystem, depending which patch you have applied. 72 */ 73 int dm_interface_init(void); 74 void dm_interface_exit(void); 75 76 /* 77 * sysfs interface 78 */ 79 int dm_sysfs_init(struct mapped_device *md); 80 void dm_sysfs_exit(struct mapped_device *md); 81 struct kobject *dm_kobject(struct mapped_device *md); 82 struct mapped_device *dm_get_from_kobject(struct kobject *kobj); 83 84 /* 85 * Targets for linear and striped mappings 86 */ 87 int dm_linear_init(void); 88 void dm_linear_exit(void); 89 90 int dm_stripe_init(void); 91 void dm_stripe_exit(void); 92 93 int dm_open_count(struct mapped_device *md); 94 int dm_lock_for_deletion(struct mapped_device *md); 95 96 void dm_kobject_uevent(struct mapped_device *md); 97 98 int dm_kcopyd_init(void); 99 void dm_kcopyd_exit(void); 100 101 #endif 102