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__ */ 77
