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_event_callback(struct dm_table *t,
  40                              void (*fn)(void *), void *context);
  41 struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index);
  42 struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
  43 void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q);
  44 struct list_head *dm_table_get_devices(struct dm_table *t);
  45 void dm_table_presuspend_targets(struct dm_table *t);
  46 void dm_table_postsuspend_targets(struct dm_table *t);
  47 int dm_table_resume_targets(struct dm_table *t);
  48 int dm_table_any_congested(struct dm_table *t, int bdi_bits);
  49
  50 /*
  51  * To check the return value from dm_table_find_target().
  52  */
  53 #define dm_target_is_valid(t) ((t)->table)
  54 int dm_table_barrier_ok(struct dm_table *t);
  55
  56 /*-----------------------------------------------------------------
  57  * A registry of target types.
  58  *---------------------------------------------------------------*/
  59 int dm_target_init(void);
  60 void dm_target_exit(void);
  61 struct target_type *dm_get_target_type(const char *name);
  62 void dm_put_target_type(struct target_type *t);
  63 int dm_target_iterate(void (*iter_func)(struct target_type *tt,
  64                                         void *param), void *param);
  65
  66 int dm_split_args(int *argc, char ***argvp, char *input);
  67
  68 /*
  69  * The device-mapper can be driven through one of two interfaces;
  70  * ioctl or filesystem, depending which patch you have applied.
  71  */
  72 int dm_interface_init(void);
  73 void dm_interface_exit(void);
  74
  75 /*
  76  * Targets for linear and striped mappings
  77  */
  78 int dm_linear_init(void);
  79 void dm_linear_exit(void);
  80
  81 int dm_stripe_init(void);
  82 void dm_stripe_exit(void);
  83
  84 int dm_open_count(struct mapped_device *md);
  85 int dm_lock_for_deletion(struct mapped_device *md);
  86
  87 void dm_kobject_uevent(struct mapped_device *md);
  88
  89 int dm_kcopyd_init(void);
  90 void dm_kcopyd_exit(void);
  91
  92 #endif