include/linux/dlm_device.h

   1 /******************************************************************************
   2 *******************************************************************************
   3 **
   4 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
   5 **  Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
   6 **
   7 **  This copyrighted material is made available to anyone wishing to use,
   8 **  modify, copy, or redistribute it subject to the terms and conditions
   9 **  of the GNU General Public License v.2.
  10 **
  11 *******************************************************************************
  12 ******************************************************************************/
  13
  14 /* This is the device interface for dlm, most users will use a library
  15  * interface.
  16  */
  17
  18 #define DLM_USER_LVB_LEN        32
  19
  20 /* Version of the device interface */
  21 #define DLM_DEVICE_VERSION_MAJOR 6
  22 #define DLM_DEVICE_VERSION_MINOR 0
  23 #define DLM_DEVICE_VERSION_PATCH 0
  24
  25 /* struct passed to the lock write */
  26 struct dlm_lock_params {
  27         __u8 mode;
  28         __u8 namelen;
  29         __u16 unused;
  30         __u32 flags;
  31         __u32 lkid;
  32         __u32 parent;
  33         __u64 xid;
  34         __u64 timeout;
  35         void __user *castparam;
  36         void __user *castaddr;
  37         void __user *bastparam;
  38         void __user *bastaddr;
  39         struct dlm_lksb __user *lksb;
  40         char lvb[DLM_USER_LVB_LEN];
  41         char name[0];
  42 };
  43
  44 struct dlm_lspace_params {
  45         __u32 flags;
  46         __u32 minor;
  47         char name[0];
  48 };
  49
  50 struct dlm_purge_params {
  51         __u32 nodeid;
  52         __u32 pid;
  53 };
  54
  55 struct dlm_write_request {
  56         __u32 version[3];
  57         __u8 cmd;
  58         __u8 is64bit;
  59         __u8 unused[2];
  60
  61         union  {
  62                 struct dlm_lock_params   lock;
  63                 struct dlm_lspace_params lspace;
  64                 struct dlm_purge_params  purge;
  65         } i;
  66 };
  67
  68 struct dlm_device_version {
  69         __u32 version[3];
  70 };
  71
  72 /* struct read from the "device" fd,
  73    consists mainly of userspace pointers for the library to use */
  74
  75 struct dlm_lock_result {
  76         __u32 version[3];
  77         __u32 length;
  78         void __user * user_astaddr;
  79         void __user * user_astparam;
  80         struct dlm_lksb __user * user_lksb;
  81         struct dlm_lksb lksb;
  82         __u8 bast_mode;
  83         __u8 unused[3];
  84         /* Offsets may be zero if no data is present */
  85         __u32 lvb_offset;
  86 };
  87
  88 /* Commands passed to the device */
  89 #define DLM_USER_LOCK         1
  90 #define DLM_USER_UNLOCK       2
  91 #define DLM_USER_QUERY        3
  92 #define DLM_USER_CREATE_LOCKSPACE  4
  93 #define DLM_USER_REMOVE_LOCKSPACE  5
  94 #define DLM_USER_PURGE        6
  95 #define DLM_USER_DEADLOCK     7
  96
  97 /* Arbitrary length restriction */
  98 #define MAX_LS_NAME_LEN 64
  99
 100 /* Lockspace flags */
 101 #define DLM_USER_LSFLG_AUTOFREE   1
 102 #define DLM_USER_LSFLG_FORCEFREE  2
 103