src/store_swapin.cc

   1 /*
   2  * DEBUG: section 20    Storage Manager Swapin Functions
   3  * AUTHOR: Duane Wessels
   4  *
   5  * SQUID Web Proxy Cache          http://www.squid-cache.org/
   6  * ----------------------------------------------------------
   7  *
   8  *  Squid is the result of efforts by numerous individuals from
   9  *  the Internet community; see the CONTRIBUTORS file for full
  10  *  details.   Many organizations have provided support for Squid's
  11  *  development; see the SPONSORS file for full details.  Squid is
  12  *  Copyrighted (C) 2001 by the Regents of the University of
  13  *  California; see the COPYRIGHT file for full details.  Squid
  14  *  incorporates software developed and/or copyrighted by other
  15  *  sources; see the CREDITS file for full details.
  16  *
  17  *  This program is free software; you can redistribute it and/or modify
  18  *  it under the terms of the GNU General Public License as published by
  19  *  the Free Software Foundation; either version 2 of the License, or
  20  *  (at your option) any later version.
  21  *
  22  *  This program is distributed in the hope that it will be useful,
  23  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  *  GNU General Public License for more details.
  26  *
  27  *  You should have received a copy of the GNU General Public License
  28  *  along with this program; if not, write to the Free Software
  29  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
  30  *
  31  */
  32
  33 #include "squid.h"
  34 #include "globals.h"
  35 #include "StatCounters.h"
  36 #include "Store.h"
  37 #include "store_swapin.h"
  38 #include "StoreClient.h"
  39
  40 static StoreIOState::STIOCB storeSwapInFileClosed;
  41 static StoreIOState::STFNCB storeSwapInFileNotify;
  42
  43 void
  44 storeSwapInStart(store_client * sc)
  45 {
  46     StoreEntry *e = sc->entry;
  47
  48     if (!EBIT_TEST(e->flags, ENTRY_VALIDATED)) {
  49         /* We're still reloading and haven't validated this entry yet */
  50         return;
  51     }
  52
  53     if (e->mem_status != NOT_IN_MEMORY)
  54         debugs(20, 3, HERE << "already IN_MEMORY");
  55
  56     debugs(20, 3, "storeSwapInStart: called for : " << e->swap_dirn << " " <<
  57            std::hex << std::setw(8) << std::setfill('0') << std::uppercase <<
  58            e->swap_filen << " " <<  e->getMD5Text());
  59
  60     if (e->swap_status != SWAPOUT_WRITING && e->swap_status != SWAPOUT_DONE) {
  61         debugs(20, DBG_IMPORTANT, "storeSwapInStart: bad swap_status (" << swapStatusStr[e->swap_status] << ")");
  62         return;
  63     }
  64
  65     if (e->swap_filen < 0) {
  66         debugs(20, DBG_IMPORTANT, "storeSwapInStart: swap_filen < 0");
  67         return;
  68     }
  69
  70     assert(e->mem_obj != NULL);
  71     debugs(20, 3, "storeSwapInStart: Opening fileno " << std::hex << std::setw(8) << std::setfill('0') << std::uppercase << e->swap_filen);
  72     sc->swapin_sio = storeOpen(e, storeSwapInFileNotify, storeSwapInFileClosed, sc);
  73 }
  74
  75 static void
  76 storeSwapInFileClosed(void *data, int errflag, StoreIOState::Pointer self)
  77 {
  78     store_client *sc = (store_client *)data;
  79     debugs(20, 3, "storeSwapInFileClosed: sio=" << sc->swapin_sio.getRaw() << ", errflag=" << errflag);
  80     sc->swapin_sio = NULL;
  81
  82     if (sc->_callback.pending()) {
  83         assert (errflag <= 0);
  84         sc->callback(0, errflag ? true : false);
  85     }
  86
  87     ++statCounter.swap.ins;
  88 }
  89
  90 static void
  91 storeSwapInFileNotify(void *data, int errflag, StoreIOState::Pointer self)
  92 {
  93     store_client *sc = (store_client *)data;
  94     StoreEntry *e = sc->entry;
  95
  96     debugs(1, 3, "storeSwapInFileNotify: changing " << e->swap_filen << "/" <<
  97            e->swap_dirn << " to " << sc->swapin_sio->swap_filen << "/" <<
  98            sc->swapin_sio->swap_dirn);
  99
 100     assert(e->swap_filen < 0); // if this fails, call SwapDir::disconnect(e)
 101     e->swap_filen = sc->swapin_sio->swap_filen;
 102     e->swap_dirn = sc->swapin_sio->swap_dirn;
 103 }