sys/dev/raidframe/rf_dagflags.h

   1 /*      $NetBSD: rf_dagflags.h,v 1.3.42.3 2004/09/21 13:32:51 skrll Exp $       */
   2 /*
   3  * Copyright (c) 1995 Carnegie-Mellon University.
   4  * All rights reserved.
   5  *
   6  * Author: Mark Holland
   7  *
   8  * Permission to use, copy, modify and distribute this software and
   9  * its documentation is hereby granted, provided that both the copyright
  10  * notice and this permission notice appear in all copies of the
  11  * software, derivative works or modified versions, and any portions
  12  * thereof, and that both notices appear in supporting documentation.
  13  *
  14  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  15  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
  16  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  17  *
  18  * Carnegie Mellon requests users of this software to return to
  19  *
  20  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  21  *  School of Computer Science
  22  *  Carnegie Mellon University
  23  *  Pittsburgh PA 15213-3890
  24  *
  25  * any improvements or extensions that they make and grant Carnegie the
  26  * rights to redistribute these changes.
  27  */
  28
  29 /**************************************************************************************
  30  *
  31  * dagflags.h -- flags that can be given to DoAccess
  32  * I pulled these out of dag.h because routines that call DoAccess may need these flags,
  33  * but certainly do not need the declarations related to the DAG data structures.
  34  *
  35  **************************************************************************************/
  36
  37
  38 #ifndef _RF__RF_DAGFLAGS_H_
  39 #define _RF__RF_DAGFLAGS_H_
  40
  41 /*
  42  * Bitmasks for the "flags" parameter (RF_RaidAccessFlags_t) used
  43  * by DoAccess, SelectAlgorithm, and the DAG creation routines.
  44  *
  45  * If USE_DAG or USE_ASM is specified, neither the DAG nor the ASM
  46  * will be modified, which means that you can't SUPRESS if you
  47  * specify USE_DAG.
  48  */
  49
  50 #define RF_DAG_FLAGS_NONE             0 /* no flags */
  51 #define RF_DAG_SUPPRESS_LOCKS     (1<<0)        /* supress all stripe locks in
  52                                                  * the DAG */
  53 #define RF_DAG_NONBLOCKING_IO     (1<<3)        /* cause DoAccess to be
  54                                                  * non-blocking */
  55 #define RF_DAG_ACCESS_COMPLETE    (1<<4)        /* the access is complete */
  56 #define RF_DAG_DISPATCH_RETURNED  (1<<5)        /* used to handle the case
  57                                                  * where the dag invokes no
  58                                                  * I/O */
  59
  60 #endif                          /* !_RF__RF_DAGFLAGS_H_ */