1 /****************************************************************************** 2 ******************************************************************************* 3 ** 4 ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 5 ** Copyright (C) 2004-2008 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 #ifndef __DLM_DOT_H__ 15 #define __DLM_DOT_H__ 16 17 /* 18 * Interface to Distributed Lock Manager (DLM) 19 * routines and structures to use DLM lockspaces 20 */ 21 22 /* Lock levels and flags are here */ 23 #include <linux/dlmconstants.h> 24 #include <linux/types.h> 25 26 typedef void dlm_lockspace_t; 27 28 /* 29 * Lock status block 30 * 31 * Use this structure to specify the contents of the lock value block. For a 32 * conversion request, this structure is used to specify the lock ID of the 33 * lock. DLM writes the status of the lock request and the lock ID assigned 34 * to the request in the lock status block. 35 * 36 * sb_lkid: the returned lock ID. It is set on new (non-conversion) requests. 37 * It is available when dlm_lock returns. 38 * 39 * sb_lvbptr: saves or returns the contents of the lock's LVB according to rules 40 * shown for the DLM_LKF_VALBLK flag. 41 * 42 * sb_flags: DLM_SBF_DEMOTED is returned if in the process of promoting a lock, 43 * it was first demoted to NL to avoid conversion deadlock. 44 * DLM_SBF_VALNOTVALID is returned if the resource's LVB is marked invalid. 45 * 46 * sb_status: the returned status of the lock request set prior to AST 47 * execution. Possible return values: 48 * 49 * 0 if lock request was successful 50 * -EAGAIN if request would block and is flagged DLM_LKF_NOQUEUE 51 * -DLM_EUNLOCK if unlock request was successful 52 * -DLM_ECANCEL if a cancel completed successfully 53 * -EDEADLK if a deadlock was detected 54 * -ETIMEDOUT if the lock request was canceled due to a timeout 55 */ 56 57 #define DLM_SBF_DEMOTED 0x01 58 #define DLM_SBF_VALNOTVALID 0x02 59 #define DLM_SBF_ALTMODE 0x04 60 61 struct dlm_lksb { 62 int sb_status; 63 __u32 sb_lkid; 64 char sb_flags; 65 char * sb_lvbptr; 66 }; 67 68 /* dlm_new_lockspace() flags */ 69 70 #define DLM_LSFL_NODIR 0x00000001 71 #define DLM_LSFL_TIMEWARN 0x00000002 72 #define DLM_LSFL_FS 0x00000004 73 #define DLM_LSFL_NEWEXCL 0x00000008 74 75 76 #endif /* __DLM_DOT_H__ */ 77 78
