sys/vfs/hammer/hammer_transaction.c

   1 /*
   2  * Copyright (c) 2007 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/sys/vfs/hammer/hammer_transaction.c,v 1.4 2007/12/29 09:01:27 dillon Exp $
  35  */
  36
  37 #include "hammer.h"
  38
  39 void
  40 hammer_start_transaction(struct hammer_transaction *trans,
  41                          struct hammer_mount *hmp)
  42 {
  43         int error;
  44
  45         trans->hmp = hmp;
  46         trans->rootvol = hammer_get_root_volume(hmp, &error);
  47         KKASSERT(error == 0);
  48         trans->tid = hammer_alloc_tid(trans);
  49 }
  50
  51 void
  52 hammer_abort_transaction(struct hammer_transaction *trans)
  53 {
  54         hammer_rel_volume(trans->rootvol, 0);
  55 }
  56
  57 void
  58 hammer_commit_transaction(struct hammer_transaction *trans)
  59 {
  60         hammer_rel_volume(trans->rootvol, 0);
  61 }
  62
  63 hammer_tid_t
  64 hammer_alloc_tid(hammer_transaction_t trans)
  65 {
  66         hammer_volume_ondisk_t ondisk;
  67         struct timespec ts;
  68         hammer_tid_t tid;
  69
  70         getnanotime(&ts);
  71         tid = ts.tv_sec * 1000000000LL + ts.tv_nsec;
  72         ondisk = trans->rootvol->ondisk;
  73         if (tid < ondisk->vol0_nexttid)
  74                 tid = ondisk->vol0_nexttid;
  75         if (tid == 0xFFFFFFFFFFFFFFFFULL)
  76                 panic("hammer_start_transaction: Ran out of TIDs!");
  77         ondisk->vol0_nexttid = tid + 1;
  78         hammer_modify_volume(trans->rootvol);
  79
  80         return(tid);
  81 }
  82
  83 hammer_tid_t
  84 hammer_alloc_recid(hammer_transaction_t trans)
  85 {
  86         hammer_volume_ondisk_t ondisk;
  87         hammer_tid_t recid;
  88
  89         ondisk = trans->rootvol->ondisk;
  90         recid = ++ondisk->vol0_recid;
  91         hammer_modify_volume(trans->rootvol);
  92         return(recid);
  93 }