drivers/md/dm.h

   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