include/uapi/linux/dlm.h

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 /******************************************************************************
   3 *******************************************************************************
   4 **
   5 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
   6 **  Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
   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 General Public License v.2.
  11 **
  12 *******************************************************************************
  13 ******************************************************************************/
  14
  15 #ifndef _UAPI__DLM_DOT_H__
  16 #define _UAPI__DLM_DOT_H__
  17
  18 /*
  19  * Interface to Distributed Lock Manager (DLM)
  20  * routines and structures to use DLM lockspaces
  21  */
  22
  23 /* Lock levels and flags are here */
  24 #include <linux/dlmconstants.h>
  25 #include <linux/types.h>
  26
  27 typedef void dlm_lockspace_t;
  28
  29 /*
  30  * Lock status block
  31  *
  32  * Use this structure to specify the contents of the lock value block.  For a
  33  * conversion request, this structure is used to specify the lock ID of the
  34  * lock.  DLM writes the status of the lock request and the lock ID assigned
  35  * to the request in the lock status block.
  36  *
  37  * sb_lkid: the returned lock ID.  It is set on new (non-conversion) requests.
  38  * It is available when dlm_lock returns.
  39  *
  40  * sb_lvbptr: saves or returns the contents of the lock's LVB according to rules
  41  * shown for the DLM_LKF_VALBLK flag.
  42  *
  43  * sb_flags: DLM_SBF_DEMOTED is returned if in the process of promoting a lock,
  44  * it was first demoted to NL to avoid conversion deadlock.
  45  * DLM_SBF_VALNOTVALID is returned if the resource's LVB is marked invalid.
  46  *
  47  * sb_status: the returned status of the lock request set prior to AST
  48  * execution.  Possible return values:
  49  *
  50  * 0 if lock request was successful
  51  * -EAGAIN if request would block and is flagged DLM_LKF_NOQUEUE
  52  * -DLM_EUNLOCK if unlock request was successful
  53  * -DLM_ECANCEL if a cancel completed successfully
  54  * -EDEADLK if a deadlock was detected
  55  * -ETIMEDOUT if the lock request was canceled due to a timeout
  56  */
  57
  58 #define DLM_SBF_DEMOTED         0x01
  59 #define DLM_SBF_VALNOTVALID     0x02
  60 #define DLM_SBF_ALTMODE         0x04
  61
  62 struct dlm_lksb {
  63         int      sb_status;
  64         __u32    sb_lkid;
  65         char     sb_flags;
  66         char *   sb_lvbptr;
  67 };
  68
  69 /* dlm_new_lockspace() flags */
  70
  71 #define DLM_LSFL_TIMEWARN       0x00000002
  72 #define DLM_LSFL_FS             0x00000004
  73 #define DLM_LSFL_NEWEXCL        0x00000008
  74
  75
  76 #endif /* _UAPI__DLM_DOT_H__ */