include/linux/dlm_device.h

   1 /******************************************************************************
   2 *******************************************************************************
   3 **
   4 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
   5 **  Copyright (C) 2004-2005 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 4
  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         __u16 flags;
  29         __u32 lkid;
  30         __u32 parent;
  31         __u8 namelen;
  32         void __user *castparam;
  33         void __user *castaddr;
  34         void __user *bastparam;
  35         void __user *bastaddr;
  36         struct dlm_lksb __user *lksb;
  37         char lvb[DLM_USER_LVB_LEN];
  38         char name[1];
  39 };
  40
  41 struct dlm_lspace_params {
  42         __u32 flags;
  43         __u32 minor;
  44         char name[1];
  45 };
  46
  47 struct dlm_write_request {
  48         __u32 version[3];
  49         __u8 cmd;
  50
  51         union  {
  52                 struct dlm_lock_params   lock;
  53                 struct dlm_lspace_params lspace;
  54         } i;
  55 };
  56
  57 /* struct read from the "device" fd,
  58    consists mainly of userspace pointers for the library to use */
  59 struct dlm_lock_result {
  60         __u32 length;
  61         void __user * user_astaddr;
  62         void __user * user_astparam;
  63         struct dlm_lksb __user * user_lksb;
  64         struct dlm_lksb lksb;
  65         __u8 bast_mode;
  66         /* Offsets may be zero if no data is present */
  67         __u32 lvb_offset;
  68 };
  69
  70 /* Commands passed to the device */
  71 #define DLM_USER_LOCK         1
  72 #define DLM_USER_UNLOCK       2
  73 #define DLM_USER_QUERY        3
  74 #define DLM_USER_CREATE_LOCKSPACE  4
  75 #define DLM_USER_REMOVE_LOCKSPACE  5
  76
  77 /* Arbitrary length restriction */
  78 #define MAX_LS_NAME_LEN 64
  79
  80 /* Lockspace flags */
  81 #define DLM_USER_LSFLG_AUTOFREE   1
  82 #define DLM_USER_LSFLG_FORCEFREE  2
  83