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      1 /******************************************************************************
      2 *******************************************************************************
      3 **
      4 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
      5 **  Copyright (C) 2004-2011 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 _UAPI__DLM_DOT_H__
     15 #define _UAPI__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_TIMEWARN	0x00000002
     71 #define DLM_LSFL_FS     	0x00000004
     72 #define DLM_LSFL_NEWEXCL     	0x00000008
     73 
     74 
     75 #endif /* _UAPI__DLM_DOT_H__ */
     76