src/store_swapin.cc

   1
   2 /*
   3  * $Id: store_swapin.cc,v 1.35 2003/02/21 22:50:12 robertc Exp $
   4  *
   5  * DEBUG: section 20    Storage Manager Swapin Functions
   6  * AUTHOR: Duane Wessels
   7  *
   8  * SQUID Web Proxy Cache          http://www.squid-cache.org/
   9  * ----------------------------------------------------------
  10  *
  11  *  Squid is the result of efforts by numerous individuals from
  12  *  the Internet community; see the CONTRIBUTORS file for full
  13  *  details.   Many organizations have provided support for Squid's
  14  *  development; see the SPONSORS file for full details.  Squid is
  15  *  Copyrighted (C) 2001 by the Regents of the University of
  16  *  California; see the COPYRIGHT file for full details.  Squid
  17  *  incorporates software developed and/or copyrighted by other
  18  *  sources; see the CREDITS file for full details.
  19  *
  20  *  This program is free software; you can redistribute it and/or modify
  21  *  it under the terms of the GNU General Public License as published by
  22  *  the Free Software Foundation; either version 2 of the License, or
  23  *  (at your option) any later version.
  24  *
  25  *  This program is distributed in the hope that it will be useful,
  26  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  27  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  28  *  GNU General Public License for more details.
  29  *
  30  *  You should have received a copy of the GNU General Public License
  31  *  along with this program; if not, write to the Free Software
  32  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
  33  *
  34  */
  35
  36 #include "squid.h"
  37 #include "StoreClient.h"
  38 #include "Store.h"
  39
  40 static STIOCB storeSwapInFileClosed;
  41 static STFNCB storeSwapInFileNotify;
  42
  43 void
  44 storeSwapInStart(store_client * sc)
  45 {
  46     StoreEntry *e = sc->entry;
  47     assert(e->mem_status == NOT_IN_MEMORY);
  48
  49     if (!EBIT_TEST(e->flags, ENTRY_VALIDATED)) {
  50         /* We're still reloading and haven't validated this entry yet */
  51         return;
  52     }
  53
  54     debug(20, 3) ("storeSwapInStart: called for %d %08X %s \n",
  55                   e->swap_dirn, e->swap_filen, e->getMD5Text());
  56
  57     if (e->swap_status != SWAPOUT_WRITING && e->swap_status != SWAPOUT_DONE) {
  58         debug(20, 1) ("storeSwapInStart: bad swap_status (%s)\n",
  59                       swapStatusStr[e->swap_status]);
  60         return;
  61     }
  62
  63     if (e->swap_filen < 0) {
  64         debug(20, 1) ("storeSwapInStart: swap_filen < 0\n");
  65         return;
  66     }
  67
  68     assert(e->mem_obj != NULL);
  69     debug(20, 3) ("storeSwapInStart: Opening fileno %08X\n",
  70                   e->swap_filen);
  71     sc->swapin_sio = storeOpen(e, storeSwapInFileNotify, storeSwapInFileClosed, sc);
  72 }
  73
  74 static void
  75 storeSwapInFileClosed(void *data, int errflag, storeIOState * sio)
  76 {
  77     store_client *sc = (store_client *)data;
  78     debug(20, 3) ("storeSwapInFileClosed: sio=%p, errflag=%d\n",
  79                   sio, errflag);
  80     sc->swapin_sio = NULL;
  81     /* why this assert */
  82
  83     if (sc->callbackPending()) {
  84         assert (errflag <= 0);
  85         sc->callback(0, errflag ? true : false);
  86     }
  87
  88     statCounter.swap.ins++;
  89 }
  90
  91 static void
  92 storeSwapInFileNotify(void *data, int errflag, storeIOState * sio)
  93 {
  94     store_client *sc = (store_client *)data;
  95     StoreEntry *e = sc->entry;
  96
  97     debug(1, 3) ("storeSwapInFileNotify: changing %d/%d to %d/%d\n", e->swap_filen, e->swap_dirn, sio->swap_filen, sio->swap_dirn);
  98
  99     e->swap_filen = sio->swap_filen;
 100     e->swap_dirn = sio->swap_dirn;
 101 }