cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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dlm.h (2568B)

      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
     27typedef 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
     62struct 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__ */