external/gpl2/lvm2/dist/include/libdevmapper-event.h

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2005-2007 Red Hat, Inc. All rights reserved.
   5  *
   6  * This file is part of the device-mapper userspace tools.
   7  *
   8  * This copyrighted material is made available to anyone wishing to use,
   9  * modify, copy, or redistribute it subject to the terms and conditions
  10  * of the GNU Lesser General Public License v.2.1.
  11  *
  12  * You should have received a copy of the GNU Lesser General Public License
  13  * along with this program; if not, write to the Free Software Foundation,
  14  * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15  */
  16
  17 /*
  18  * Note that this file is released only as part of a technology preview
  19  * and its contents may change in future updates in ways that do not
  20  * preserve compatibility.
  21  */
  22
  23 #ifndef LIB_DMEVENT_H
  24 #define LIB_DMEVENT_H
  25
  26 #include <stdint.h>
  27
  28 /*
  29  * Event library interface.
  30  */
  31
  32 enum dm_event_mask {
  33         DM_EVENT_SETTINGS_MASK  = 0x0000FF,
  34         DM_EVENT_SINGLE         = 0x000001, /* Report multiple errors just once. */
  35         DM_EVENT_MULTI          = 0x000002, /* Report all of them. */
  36
  37         DM_EVENT_ERROR_MASK     = 0x00FF00,
  38         DM_EVENT_SECTOR_ERROR   = 0x000100, /* Failure on a particular sector. */
  39         DM_EVENT_DEVICE_ERROR   = 0x000200, /* Device failure. */
  40         DM_EVENT_PATH_ERROR     = 0x000400, /* Failure on an io path. */
  41         DM_EVENT_ADAPTOR_ERROR  = 0x000800, /* Failure of a host adaptor. */
  42
  43         DM_EVENT_STATUS_MASK    = 0xFF0000,
  44         DM_EVENT_SYNC_STATUS    = 0x010000, /* Mirror synchronization completed/failed. */
  45         DM_EVENT_TIMEOUT        = 0x020000, /* Timeout has occured */
  46
  47         DM_EVENT_REGISTRATION_PENDING = 0x1000000, /* Monitor thread is setting-up/shutting-down */
  48 };
  49
  50 #define DM_EVENT_ALL_ERRORS DM_EVENT_ERROR_MASK
  51
  52 struct dm_event_handler;
  53
  54 struct dm_event_handler *dm_event_handler_create(void);
  55 void dm_event_handler_destroy(struct dm_event_handler *dmevh);
  56
  57 /*
  58  * Path of shared library to handle events.
  59  *
  60  * All of dso, device_name and uuid strings are duplicated, you do not
  61  * need to keep the pointers valid after the call succeeds. Thes may
  62  * return -ENOMEM though.
  63  */
  64 int dm_event_handler_set_dso(struct dm_event_handler *dmevh, const char *path);
  65
  66 /*
  67  * Identify the device to monitor by exactly one of device_name, uuid or
  68  * device number. String arguments are duplicated, see above.
  69  */
  70 int dm_event_handler_set_dev_name(struct dm_event_handler *dmevh, const char *device_name);
  71
  72 int dm_event_handler_set_uuid(struct dm_event_handler *dmevh, const char *uuid);
  73
  74 void dm_event_handler_set_major(struct dm_event_handler *dmevh, int major);
  75 void dm_event_handler_set_minor(struct dm_event_handler *dmevh, int minor);
  76 void dm_event_handler_set_timeout(struct dm_event_handler *dmevh, int timeout);
  77
  78 /*
  79  * Specify mask for events to monitor.
  80  */
  81 void dm_event_handler_set_event_mask(struct dm_event_handler *dmevh,
  82                                      enum dm_event_mask evmask);
  83
  84 const char *dm_event_handler_get_dso(const struct dm_event_handler *dmevh);
  85 const char *dm_event_handler_get_dev_name(const struct dm_event_handler *dmevh);
  86 const char *dm_event_handler_get_uuid(const struct dm_event_handler *dmevh);
  87 int dm_event_handler_get_major(const struct dm_event_handler *dmevh);
  88 int dm_event_handler_get_minor(const struct dm_event_handler *dmevh);
  89 int dm_event_handler_get_timeout(const struct dm_event_handler *dmevh);
  90 enum dm_event_mask dm_event_handler_get_event_mask(const struct dm_event_handler *dmevh);
  91
  92 /* FIXME Review interface (what about this next thing?) */
  93 int dm_event_get_registered_device(struct dm_event_handler *dmevh, int next);
  94
  95 /*
  96  * Initiate monitoring using dmeventd.
  97  */
  98 int dm_event_register_handler(const struct dm_event_handler *dmevh);
  99 int dm_event_unregister_handler(const struct dm_event_handler *dmevh);
 100
 101 /* Prototypes for DSO interface, see dmeventd.c, struct dso_data for
 102    detailed descriptions. */
 103 void process_event(struct dm_task *dmt, enum dm_event_mask evmask, void **user);
 104 int register_device(const char *device_name, const char *uuid, int major, int minor, void **user);
 105 int unregister_device(const char *device_name, const char *uuid, int major,
 106                       int minor, void **user);
 107
 108 #endif