X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=bacula%2Fsrc%2Fstored%2Facquire.c;h=2aba36809223d54a9cf23ea2b29688d2f05d3eec;hb=36b40d5c7f3ff90565ab73ac75f0dc4f6660ff37;hp=e673bd7669d046d5f3286b38dbf037e68d0e210e;hpb=23392837f61fc878b87f5acb07d1a8cfb128b25d;p=bacula%2Fbacula

diff --git a/bacula/src/stored/acquire.c b/bacula/src/stored/acquire.c
index e673bd7669..2aba368092 100644
--- a/bacula/src/stored/acquire.c
+++ b/bacula/src/stored/acquire.c
@@ -1,21 +1,14 @@
-/*
- *  Routines to acquire and release a device for read/write
- *
- *   Kern Sibbald, August MMII
- *
- *   Version $Id$
- */
 /*
    Bacula® - The Network Backup Solution
 
-   Copyright (C) 2002-2006 Free Software Foundation Europe e.V.
+   Copyright (C) 2002-2008 Free Software Foundation Europe e.V.
 
    The main author of Bacula is Kern Sibbald, with contributions from
    many others, a complete list can be found in the file AUTHORS.
    This program is Free Software; you can redistribute it and/or
    modify it under the terms of version two of the GNU General Public
-   License as published by the Free Software Foundation plus additions
-   that are listed in the file LICENSE.
+   License as published by the Free Software Foundation and included
+   in the file LICENSE.
 
    This program is distributed in the hope that it will be useful, but
    WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -27,17 +20,25 @@
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
    02110-1301, USA.
 
-   Bacula® is a registered trademark of John Walker.
+   Bacula® is a registered trademark of Kern Sibbald.
    The licensor of Bacula is the Free Software Foundation Europe
    (FSFE), Fiduciary Program, Sumatrastrasse 25, 8006 Zürich,
    Switzerland, email:ftf@fsfeurope.org.
 */
+/*
+ *  Routines to acquire and release a device for read/write
+ *
+ *   Kern Sibbald, August MMII
+ *
+ *   Version $Id$
+ */
 
 #include "bacula.h"                   /* pull in global headers */
 #include "stored.h"                   /* pull in Storage Deamon headers */
 
 /* Forward referenced functions */
 static void attach_dcr_to_dev(DCR *dcr);
+static void set_dcr_from_vol(DCR *dcr, VOL_LIST *vol);
 
 
 /*********************************************************************
@@ -62,11 +63,11 @@ bool acquire_device_for_read(DCR *dcr)
    int vol_label_status;
    int retry = 0;
    
-   Dmsg1(50, "jcr->dcr=%p\n", jcr->dcr);
-   dev->block(BST_DOING_ACQUIRE);
+   Dmsg1(950, "jcr->dcr=%p\n", jcr->dcr);
+   dev->dblock(BST_DOING_ACQUIRE);
 
    if (dev->num_writers > 0) {
-      Jmsg2(jcr, M_FATAL, 0, _("Num_writers=%d not zero. Job %d canceled.\n"), 
+      Jmsg2(jcr, M_FATAL, 0, _("Acquire read: num_writers=%d not zero. Job %d canceled.\n"), 
          dev->num_writers, jcr->JobId);
       goto get_out;
    }
@@ -75,7 +76,7 @@ bool acquire_device_for_read(DCR *dcr)
    vol = jcr->VolList;
    if (!vol) {
       char ed1[50];
-      Jmsg(jcr, M_FATAL, 0, _("No volumes specified. Job %s canceled.\n"), 
+      Jmsg(jcr, M_FATAL, 0, _("No volumes specified for reading. Job %s canceled.\n"), 
          edit_int64(jcr->JobId, ed1));
       goto get_out;
    }
@@ -84,29 +85,42 @@ bool acquire_device_for_read(DCR *dcr)
       vol = vol->next;
    }
    if (!vol) {
-      Jmsg(jcr, M_FATAL, 0, _("Logic error: no next volume. Numvol=%d Curvol=%d\n"),
+      Jmsg(jcr, M_FATAL, 0, _("Logic error: no next volume to read. Numvol=%d Curvol=%d\n"),
          jcr->NumReadVolumes, jcr->CurReadVolume);
       goto get_out;                   /* should not happen */   
    }
-   bstrncpy(dcr->VolumeName, vol->VolumeName, sizeof(dcr->VolumeName));
-   bstrncpy(dcr->media_type, vol->MediaType, sizeof(dcr->media_type));
-   dcr->VolCatInfo.Slot = vol->Slot;
+   set_dcr_from_vol(dcr, vol);
+
+   Dmsg2(100, "Want Vol=%s Slot=%d\n", vol->VolumeName, vol->Slot);
     
    /*
     * If the MediaType requested for this volume is not the
     *  same as the current drive, we attempt to find the same
     *  device that was used to write the orginal volume.  If
     *  found, we switch to using that device.
+    *
+    *  N.B. A lot of routines rely on the dcr pointer not changing
+    *    read_records.c even has multiple dcrs cached, so we take care
+    *    here to release all important parts of the dcr and re-acquire
+    *    them such as the block pointer (size may change), but we do
+    *    not release the dcr.
     */
-   Dmsg2(100, "MediaType dcr=%s dev=%s\n", dcr->media_type, dev->device->media_type);
+   Dmsg2(50, "MediaType dcr=%s dev=%s\n", dcr->media_type, dev->device->media_type);
    if (dcr->media_type[0] && strcmp(dcr->media_type, dev->device->media_type) != 0) {
       RCTX rctx;
       DIRSTORE *store;
       int stat;
-      DCR *dcr_save = jcr->dcr;
+
+      Jmsg3(jcr, M_INFO, 0, _("Changing device. Want Media Type=\"%s\" have=\"%s\"\n"
+                              "  device=%s\n"), 
+            dcr->media_type, dev->device->media_type, dev->print_name());
+      Dmsg3(50, "Changing device. Want Media Type=\"%s\" have=\"%s\"\n"
+                              "  device=%s\n", 
+            dcr->media_type, dev->device->media_type, dev->print_name());
+
+      dev->dunblock(DEV_UNLOCKED);
 
       lock_reservations();
-      jcr->dcr = NULL;
       memset(&rctx, 0, sizeof(RCTX));
       rctx.jcr = jcr;
       jcr->reserve_msgs = New(alist(10, not_owned_by_alist));
@@ -120,46 +134,46 @@ bool acquire_device_for_read(DCR *dcr)
       bstrncpy(store->pool_type, dcr->pool_type, sizeof(store->pool_type));
       store->append = false;
       rctx.store = store;
+      clean_device(dcr);                     /* clean up the dcr */
       
       /*
-       * Note, if search_for_device() succeeds, we get a new_dcr,
-       *  which we do not use except for the dev info.
+       * Search for a new device
        */
       stat = search_res_for_device(rctx);
-      release_msgs(jcr);              /* release queued messages */
+      release_reserve_messages(jcr);         /* release queued messages */
       unlock_reservations();
+
       if (stat == 1) {
-         DCR *new_dcr = jcr->read_dcr;
-         dev->unblock();
-         detach_dcr_from_dev(dcr);    /* release old device */
-         /* Copy important info from the new dcr */
-         dev = dcr->dev = new_dcr->dev; 
-         jcr->read_dcr = dcr; 
-         dcr->device = new_dcr->device;
-         dcr->max_job_spool_size = dcr->device->max_job_spool_size;
-         attach_dcr_to_dev(dcr);
-         new_dcr->VolumeName[0] = 0;
-         free_dcr(new_dcr);
-         dev->block(BST_DOING_ACQUIRE); 
+         dev = dcr->dev;                     /* get new device pointer */
+         dev->dblock(BST_DOING_ACQUIRE); 
+         dcr->VolumeName[0] = 0;
          Jmsg(jcr, M_INFO, 0, _("Media Type change.  New device %s chosen.\n"),
             dev->print_name());
+         Dmsg1(50, "Media Type change.  New device %s chosen.\n", dev->print_name());
+
          bstrncpy(dcr->VolumeName, vol->VolumeName, sizeof(dcr->VolumeName));
+         bstrncpy(dcr->VolCatInfo.VolCatName, vol->VolumeName, sizeof(dcr->VolCatInfo.VolCatName));
          bstrncpy(dcr->media_type, vol->MediaType, sizeof(dcr->media_type));
          dcr->VolCatInfo.Slot = vol->Slot;
+         dcr->VolCatInfo.InChanger = vol->Slot > 0; 
          bstrncpy(dcr->pool_name, store->pool_name, sizeof(dcr->pool_name));
          bstrncpy(dcr->pool_type, store->pool_type, sizeof(dcr->pool_type));
-      } else if (stat == 0) {   /* device busy */
-         Pmsg1(000, "Device %s is busy.\n", vol->device);
       } else {
          /* error */
          Jmsg1(jcr, M_FATAL, 0, _("No suitable device found to read Volume \"%s\"\n"),
             vol->VolumeName);
-         jcr->dcr = dcr_save;
+         Dmsg1(50, "No suitable device found to read Volume \"%s\"\n", vol->VolumeName);
          goto get_out;
       }
-      jcr->dcr = dcr_save;
    }
 
+   dev->clear_unload();
+
+   if (dev->vol && dev->vol->is_swapping()) {
+      dev->vol->set_slot(vol->Slot);
+      Dmsg3(100, "swapping: slot=%d Vol=%s dev=%s\n", dev->vol->get_slot(),
+         dev->vol->vol_name, dev->print_name());
+   }
 
    init_device_wait_timers(dcr);
 
@@ -169,10 +183,13 @@ bool acquire_device_for_read(DCR *dcr)
 
 
    /* Volume info is always needed because of VolParts */
-   Dmsg0(200, "dir_get_volume_info\n");
+   Dmsg1(150, "dir_get_volume_info vol=%s\n", dcr->VolumeName);
    if (!dir_get_volume_info(dcr, GET_VOL_INFO_FOR_READ)) {
+      Dmsg2(150, "dir_get_vol_info failed for vol=%s: %s\n", 
+         dcr->VolumeName, jcr->errmsg);
       Jmsg1(jcr, M_WARNING, 0, "%s", jcr->errmsg);
    }
+   dev->set_load();                /* set to load volume */
    
    for ( ;; ) {
       /* If not polling limit retries */
@@ -187,7 +204,10 @@ bool acquire_device_for_read(DCR *dcr)
          goto get_out;                /* error return */
       }
 
-      autoload_device(dcr, 0, NULL);
+      dcr->do_unload();
+      dcr->do_swapping(false/*!is_writing*/);
+      dcr->do_load(false /*!is_writing*/);
+      set_dcr_from_vol(dcr, vol);          /* refresh dcr with desired volume info */
 
       /*
        * This code ensures that the device is ready for
@@ -196,22 +216,25 @@ bool acquire_device_for_read(DCR *dcr)
        */
       Dmsg1(100, "bstored: open vol=%s\n", dcr->VolumeName);
       if (dev->open(dcr, OPEN_READ_ONLY) < 0) {
-        Jmsg3(jcr, M_WARNING, 0, _("Read open device %s Volume \"%s\" failed: ERR=%s\n"),
-              dev->print_name(), dcr->VolumeName, dev->bstrerror());
+         if (!dev->poll) {
+            Jmsg3(jcr, M_WARNING, 0, _("Read open device %s Volume \"%s\" failed: ERR=%s\n"),
+                  dev->print_name(), dcr->VolumeName, dev->bstrerror());
+         }
          goto default_path;
       }
-      Dmsg1(100, "opened dev %s OK\n", dev->print_name());
+      Dmsg1(50, "opened dev %s OK\n", dev->print_name());
       
       /* Read Volume Label */
-      
-      Dmsg0(200, "calling read-vol-label\n");
+      Dmsg0(50, "calling read-vol-label\n");
       vol_label_status = read_dev_volume_label(dcr);
       switch (vol_label_status) {
       case VOL_OK:
+         Dmsg0(50, "Got correct volume.\n");
          ok = true;
-         memcpy(&dev->VolCatInfo, &dcr->VolCatInfo, sizeof(dev->VolCatInfo));
+         dev->VolCatInfo = dcr->VolCatInfo;     /* structure assignment */
          break;                    /* got it */
       case VOL_IO_ERROR:
+         Dmsg0(50, "IO Error\n");
          /*
           * Send error message generated by read_dev_volume_label()
           *  only we really had a tape mounted. This supresses superfluous
@@ -222,20 +245,21 @@ bool acquire_device_for_read(DCR *dcr)
          }
          goto default_path;
       case VOL_NAME_ERROR:
-         if (tape_initially_mounted) {
-            tape_initially_mounted = false;
+         Dmsg0(50, "Vol name error.\n");
+         if (dev->is_volume_to_unload()) {
             goto default_path;
          }
-         /* If polling and got a previous bad name, ignore it */
-         if (dev->poll && strcmp(dev->BadVolName, dev->VolHdr.VolumeName) == 0) {
-            goto default_path;
-         } else {
-             bstrncpy(dev->BadVolName, dev->VolHdr.VolumeName, sizeof(dev->BadVolName));
+         dev->set_unload();              /* force unload of unwanted tape */
+         if (!unload_autochanger(dcr, -1)) {
+            /* at least free the device so we can re-open with correct volume */
+            dev->close();                                                          
          }
+         dev->set_load();
          /* Fall through */
       default:
          Jmsg1(jcr, M_WARNING, 0, "%s", jcr->errmsg);
 default_path:
+         Dmsg0(50, "default path\n");
          tape_previously_mounted = true;
          
          /*
@@ -259,16 +283,17 @@ default_path:
          
          /* Mount a specific volume and no other */
          Dmsg0(200, "calling dir_ask_sysop\n");
-         if (!dir_ask_sysop_to_mount_volume(dcr)) {
+         if (!dir_ask_sysop_to_mount_volume(dcr, ST_READ)) {
             goto get_out;             /* error return */
          }
-         try_autochanger = true;      /* permit using autochanger again */
+         try_autochanger = true;      /* permit trying the autochanger again */
          continue;                    /* try reading again */
       } /* end switch */
       break;
    } /* end for loop */
+
    if (!ok) {
-      Jmsg1(jcr, M_FATAL, 0, _("Too many errors trying to mount device %s.\n"),
+      Jmsg1(jcr, M_FATAL, 0, _("Too many errors trying to mount device %s for reading.\n"),
             dev->print_name());
       goto get_out;
    }
@@ -281,15 +306,19 @@ default_path:
       dcr->VolumeName, dev->print_name());
 
 get_out:
-   P(dev->mutex);
-   if (dcr->reserved_device) {
-      dev->reserved_device--;
-      Dmsg2(100, "Dec reserve=%d dev=%s\n", dev->reserved_device, dev->print_name());
-      dcr->reserved_device = false;
+   dev->dlock();
+   dcr->clear_reserved();
+   /* 
+    * Normally we are blocked, but in at least one error case above 
+    *   we are not blocked because we unsuccessfully tried changing
+    *   devices.  
+    */
+   if (dev->is_blocked()) {
+      dev->dunblock(DEV_LOCKED);
+   } else {
+      dev->dunlock();               /* dunblock() unlock the device too */
    }
-   V(dev->mutex);
-   dev->unblock();
-   Dmsg1(50, "jcr->dcr=%p\n", jcr->dcr);
+   Dmsg1(950, "jcr->dcr=%p\n", jcr->dcr);
    return ok;
 }
 
@@ -305,91 +334,49 @@ get_out:
  */
 DCR *acquire_device_for_append(DCR *dcr)
 {
-   bool release = false;
-   bool recycle = false;
-   bool do_mount = false;
    DEVICE *dev = dcr->dev;
    JCR *jcr = dcr->jcr;
+   bool ok = false;
+   bool have_vol = false;
 
    init_device_wait_timers(dcr);
 
-   dev->block(BST_DOING_ACQUIRE);
-   Dmsg1(190, "acquire_append device is %s\n", dev->is_tape()?"tape":
+   dev->dblock(BST_DOING_ACQUIRE);
+   Dmsg1(100, "acquire_append device is %s\n", dev->is_tape()?"tape":
         (dev->is_dvd()?"DVD":"disk"));
 
    /*
     * With the reservation system, this should not happen
     */
    if (dev->can_read()) {
-      Jmsg1(jcr, M_FATAL, 0, _("Device %s is busy reading.\n"), dev->print_name());
-      Dmsg1(200, "Device %s is busy reading.\n", dev->print_name());
+      Jmsg1(jcr, M_FATAL, 0, _("Want to append, but device %s is busy reading.\n"), dev->print_name());
+      Dmsg1(200, "Want to append but device %s is busy reading.\n", dev->print_name());
       goto get_out;
    }
 
-   if (dev->can_append()) {
+   dev->clear_unload();
+
+   /*
+    * have_vol defines whether or not mount_next_write_volume should
+    *   ask the Director again about what Volume to use.
+    */
+   if (dev->can_append() && dcr->is_suitable_volume_mounted() &&
+       strcmp(dcr->VolCatInfo.VolCatStatus, "Recycle") != 0) {
       Dmsg0(190, "device already in append.\n");
       /*
-       * Device already in append mode
-       *
-       * Check if we have the right Volume mounted
-       *   OK if current volume info OK
-       *   OK if next volume matches current volume
-       *   otherwise mount desired volume obtained from
-       *    dir_find_next_appendable_volume
-       *  dev->VolHdr.VolumeName is what is in the drive
-       *  dcr->VolumeName is what we pass into the routines, or
-       *    get back from the subroutines.
+       * At this point, the correct tape is already mounted, so
+       *   we do not need to do mount_next_write_volume(), unless
+       *   we need to recycle the tape.
        */
-      bstrncpy(dcr->VolumeName, dev->VolHdr.VolumeName, sizeof(dcr->VolumeName));
-      if (!dir_get_volume_info(dcr, GET_VOL_INFO_FOR_WRITE) &&
-          !(dir_find_next_appendable_volume(dcr) &&
-            strcmp(dev->VolHdr.VolumeName, dcr->VolumeName) == 0)) { /* wrong tape mounted */
-         Dmsg2(190, "Wrong tape mounted: %s. wants:%s\n", dev->VolHdr.VolumeName,
-            dcr->VolumeName);
-         /* Release volume reserved by dir_find_next_appendable_volume() */
-         if (dcr->VolumeName[0]) {
-            free_unused_volume(dcr);
-         }
-         if (dev->num_writers != 0) {
-            Jmsg3(jcr, M_FATAL, 0, _("Wanted Volume \"%s\", but device %s is busy writing on \"%s\" .\n"), 
-                 dcr->VolumeName, dev->print_name(), dev->VolHdr.VolumeName);
-            Dmsg3(200, "Wanted Volume \"%s\", but device %s is busy writing on \"%s\" .\n",  
-                 dcr->VolumeName, dev->print_name(), dev->VolHdr.VolumeName);
-            goto get_out;
-         }
-         /* Wrong tape mounted, release it, then fall through to get correct one */
-         Dmsg0(190, "Wrong tape mounted, release and try mount.\n");
-         release = true;
-         do_mount = true;
-      } else {
-         /*
-          * At this point, the correct tape is already mounted, so
-          *   we do not need to do mount_next_write_volume(), unless
-          *   we need to recycle the tape.
-          */
-          recycle = strcmp(dcr->VolCatInfo.VolCatStatus, "Recycle") == 0;
-          Dmsg1(190, "Correct tape mounted. recycle=%d\n", recycle);
-          if (recycle && dev->num_writers != 0) {
-             Jmsg(jcr, M_FATAL, 0, _("Cannot recycle volume \"%s\""
-                  " on device %s because it is in use by another job.\n"),
-                  dev->VolHdr.VolumeName, dev->print_name());
-             goto get_out;
-          }
-          if (dev->num_writers == 0) {
-             memcpy(&dev->VolCatInfo, &dcr->VolCatInfo, sizeof(dev->VolCatInfo));
-          }
-      }
-   } else {
-      /* Not already in append mode, so mount the device */
-      Dmsg0(190, "Not in append mode, try mount.\n");
-      ASSERT(dev->num_writers == 0);
-      do_mount = true;
+       if (dev->num_writers == 0) {
+          memcpy(&dev->VolCatInfo, &dcr->VolCatInfo, sizeof(dev->VolCatInfo));
+       }
+       have_vol = dcr->is_tape_position_ok();
    }
 
-   if (do_mount || recycle) {
-      Dmsg0(190, "Do mount_next_write_vol\n");
-      bool mounted = mount_next_write_volume(dcr, release);
-      if (!mounted) {
+   if (!have_vol) {
+      Dmsg1(190, "jid=%u Do mount_next_write_vol\n", (uint32_t)jcr->JobId);
+      if (!dcr->mount_next_write_volume()) {
          if (!job_canceled(jcr)) {
             /* Reduce "noise" -- don't print if job canceled */
             Jmsg(jcr, M_FATAL, 0, _("Could not ready device %s for append.\n"),
@@ -406,32 +393,17 @@ DCR *acquire_device_for_append(DCR *dcr)
    if (jcr->NumWriteVolumes == 0) {
       jcr->NumWriteVolumes = 1;
    }
-   P(dev->mutex);
-   if (dcr->reserved_device) {
-      dev->reserved_device--;
-      Dmsg2(100, "Dec reserve=%d dev=%s\n", dev->reserved_device, dev->print_name());
-      dcr->reserved_device = false;
-   }
-   V(dev->mutex);
-   dev->unblock();
-   return dcr;
+   dev->VolCatInfo.VolCatJobs++;              /* increment number of jobs on vol */
+   dir_update_volume_info(dcr, false, false); /* send Volume info to Director */
+   ok = true;
 
-/*
- * Error return
- */
 get_out:
-   P(dev->mutex);
-   if (dcr->reserved_device) {
-      dev->reserved_device--;
-      Dmsg2(100, "Dec reserve=%d dev=%s\n", dev->reserved_device, dev->print_name());
-      dcr->reserved_device = false;
-   }
-   V(dev->mutex);
-   dev->unblock();
-   return NULL;
+   dev->dlock();
+   dcr->clear_reserved();
+   dev->dunblock(DEV_LOCKED);
+   return ok ? dcr : NULL;
 }
 
-
 /*
  * This job is done, so release the device. From a Unix standpoint,
  *  the device remains open.
@@ -445,24 +417,23 @@ bool release_device(DCR *dcr)
    JCR *jcr = dcr->jcr;
    DEVICE *dev = dcr->dev;
    bool ok = true;
+   char tbuf[100];
 
    /* lock only if not already locked by this thread */
-   if (!dcr->dev_locked) {
-      lock_device(dev);
+   if (!dcr->is_dev_locked()) {
+      dev->r_dlock();
    }
+   lock_volumes();
    Dmsg2(100, "release_device device %s is %s\n", dev->print_name(), dev->is_tape()?"tape":"disk");
 
    /* if device is reserved, job never started, so release the reserve here */
-   if (dcr->reserved_device) {
-      dev->reserved_device--;
-      Dmsg2(100, "Dec reserve=%d dev=%s\n", dev->reserved_device, dev->print_name());
-      dcr->reserved_device = false;
-   }
+   dcr->clear_reserved();
 
    if (dev->can_read()) {
       dev->clear_read();              /* clear read bit */
-
-      /******FIXME**** send read volume usage statistics to director */
+      Dmsg0(100, "dir_update_vol_info. Release0\n");
+      dir_update_volume_info(dcr, false, false); /* send Volume info to Director */
+      volume_unused(dcr);
 
    } else if (dev->num_writers > 0) {
       /* 
@@ -474,22 +445,26 @@ bool release_device(DCR *dcr)
       dev->num_writers--;
       Dmsg1(100, "There are %d writers in release_device\n", dev->num_writers);
       if (dev->is_labeled()) {
-         Dmsg0(100, "dir_create_jobmedia_record. Release\n");
+         Dmsg2(200, "dir_create_jobmedia. Release vol=%s dev=%s\n", 
+               dev->VolCatInfo.VolCatName, dev->print_name());
          if (!dev->at_weot() && !dir_create_jobmedia_record(dcr)) {
             Jmsg(jcr, M_FATAL, 0, _("Could not create JobMedia record for Volume=\"%s\" Job=%s\n"),
                dcr->VolCatInfo.VolCatName, jcr->Job);
          }
-         /* If no more writers, write an EOF */
+         /* If no more writers, and no errors, and wrote something, write an EOF */
          if (!dev->num_writers && dev->can_write() && dev->block_num > 0) {
             dev->weof(1);
             write_ansi_ibm_labels(dcr, ANSI_EOF_LABEL, dev->VolHdr.VolumeName);
          }
          if (!dev->at_weot()) {
             dev->VolCatInfo.VolCatFiles = dev->file;   /* set number of files */
-            dev->VolCatInfo.VolCatJobs++;              /* increment number of jobs */
             /* Note! do volume update before close, which zaps VolCatInfo */
-            Dmsg0(100, "dir_update_vol_info. Release0\n");
-            dir_update_volume_info(dcr, false); /* send Volume info to Director */
+            dir_update_volume_info(dcr, false, false); /* send Volume info to Director */
+            Dmsg2(200, "dir_update_vol_info. Release vol=%s dev=%s\n", 
+                  dev->VolCatInfo.VolCatName, dev->print_name());
+         }
+         if (dev->num_writers == 0) {         /* if not being used */
+            volume_unused(dcr);               /*  we obviously are not using the volume */
          }
       }
 
@@ -499,7 +474,13 @@ bool release_device(DCR *dcr)
        *   has failed, since the device is not in read mode and
        *   there are no writers. It was probably reserved.
        */
+      volume_unused(dcr);
    }
+   unlock_volumes();
+   Dmsg3(100, "%d writers, %d reserve, dev=%s\n", dev->num_writers, dev->num_reserved(),
+         dev->print_name());
+   debug_list_volumes("acquire:release_device()");
+
 
    /* If no writers, close if file or !CAP_ALWAYS_OPEN */
    if (dev->num_writers == 0 && (!dev->is_tape() || !dev->has_cap(CAP_ALWAYSOPEN))) {
@@ -527,42 +508,90 @@ bool release_device(DCR *dcr)
       if (status != 0) {
          berrno be;
          Jmsg(jcr, M_ALERT, 0, _("3997 Bad alert command: %s: ERR=%s.\n"),
-              alert, be.strerror(status));
+              alert, be.bstrerror(status));
       }
 
       Dmsg1(400, "alert status=%d\n", status);
       free_pool_memory(alert);
    }
-   dcr->dev_locked = false;              /* set no longer locked */
-   unlock_device(dev);
-   if (jcr->read_dcr == dcr) {
-      jcr->read_dcr = NULL;
-   }
-   if (jcr->dcr == dcr) {
-      jcr->dcr = NULL;
+   pthread_cond_broadcast(&dev->wait_next_vol);
+   Dmsg2(100, "JobId=%u broadcast wait_device_release at %s\n", 
+         (uint32_t)jcr->JobId, bstrftimes(tbuf, sizeof(tbuf), (utime_t)time(NULL)));
+   pthread_cond_broadcast(&wait_device_release);
+   dev->dunlock();
+   if (dcr->keep_dcr) {
+      detach_dcr_from_dev(dcr);
+   } else {
+      if (jcr->read_dcr == dcr) {
+         jcr->read_dcr = NULL;
+      }
+      if (jcr->dcr == dcr) {
+         jcr->dcr = NULL;
+      }
+      free_dcr(dcr);
    }
-   free_dcr(dcr);
+   Dmsg2(100, "===== Device %s released by JobId=%u\n", dev->print_name(),
+         (uint32_t)jcr->JobId);
+   return ok;
+}
+
+/*
+ * Clean up the device for reuse without freeing the memory
+ */
+bool clean_device(DCR *dcr)
+{
+   bool ok;
+   dcr->keep_dcr = true;                  /* do not free the dcr */
+   ok = release_device(dcr);
+   dcr->keep_dcr = false;
    return ok;
 }
 
 /*
  * Create a new Device Control Record and attach
  *   it to the device (if this is a real job).
+ * Note, this has been updated so that it can be called first 
+ *   without a DEVICE, then a second or third time with a DEVICE,
+ *   and each time, it should cleanup and point to the new device.
+ *   This should facilitate switching devices.
+ * Note, each dcr must point to the controlling job (jcr).  However,
+ *   a job can have multiple dcrs, so we must not store in the jcr's
+ *   structure as previously. The higher level routine must store
+ *   this dcr in the right place
+ *
  */
-DCR *new_dcr(JCR *jcr, DEVICE *dev)
+DCR *new_dcr(JCR *jcr, DCR *dcr, DEVICE *dev)
 {
-   DCR *dcr = (DCR *)malloc(sizeof(DCR));
-   memset(dcr, 0, sizeof(DCR));
-   dcr->jcr = jcr;
+   if (!dcr) {
+      dcr = (DCR *)malloc(sizeof(DCR));
+      memset(dcr, 0, sizeof(DCR));
+      dcr->tid = pthread_self();
+      dcr->spool_fd = -1;
+   }
+   dcr->jcr = jcr;                 /* point back to jcr */
+   /* Set device information, possibly change device */
    if (dev) {
-      dcr->dev = dev;
-      dcr->device = dev->device;
+      if (dcr->block) {
+         free_block(dcr->block);
+      }
       dcr->block = new_block(dev);
+      if (dcr->rec) {
+         free_record(dcr->rec);
+      }
       dcr->rec = new_record();
-      dcr->max_job_spool_size = dev->device->max_job_spool_size;
+      if (dcr->attached_to_dev) {
+         detach_dcr_from_dev(dcr);
+      }
+      /* Use job spoolsize prior to device spoolsize */
+      if (jcr->spool_size) {
+         dcr->max_job_spool_size = jcr->spool_size;
+      } else {
+         dcr->max_job_spool_size = dev->device->max_job_spool_size;
+      }
+      dcr->device = dev->device;
+      dcr->dev = dev;
       attach_dcr_to_dev(dcr);
    }
-   dcr->spool_fd = -1;
    return dcr;
 }
 
@@ -570,6 +599,9 @@ DCR *new_dcr(JCR *jcr, DEVICE *dev)
  * Search the dcrs list for the given dcr. If it is found,
  *  as it should be, then remove it. Also zap the jcr pointer
  *  to the dcr if it is the same one.
+ *
+ * Note, this code will be turned on when we can write to multiple
+ *  dcrs at the same time.
  */
 #ifdef needed
 static void remove_dcr_from_dcrs(DCR *dcr)
@@ -597,42 +629,28 @@ static void attach_dcr_to_dev(DCR *dcr)
    DEVICE *dev = dcr->dev;
    JCR *jcr = dcr->jcr;
 
-   if (!dcr->attached_to_dev && dev->is_open() && jcr && jcr->JobType != JT_SYSTEM) {
+   if (jcr) Dmsg1(500, "JobId=%u enter attach_dcr_to_dev\n", (uint32_t)jcr->JobId);
+   if (!dcr->attached_to_dev && dev->initiated && jcr && jcr->get_JobType() != JT_SYSTEM) {
       dev->attached_dcrs->append(dcr);  /* attach dcr to device */
       dcr->attached_to_dev = true;
+      Dmsg1(500, "JobId=%u attach_dcr_to_dev\n", (uint32_t)jcr->JobId);
    }
 }
 
 void detach_dcr_from_dev(DCR *dcr)
 {
    DEVICE *dev = dcr->dev;
-
-   if (dcr->reserved_device) {
-      dcr->reserved_device = false;
-      lock_device(dev);
-      dev->reserved_device--;
-      Dmsg2(100, "Dec reserve=%d dev=%s\n", dev->reserved_device, dev->print_name());
-      dcr->reserved_device = false;
-      /* If we set read mode in reserving, remove it */
-      if (dev->can_read()) {
-         dev->clear_read();
-      }
-      if (dev->num_writers < 0) {
-         Jmsg1(dcr->jcr, M_ERROR, 0, _("Hey! num_writers=%d!!!!\n"), dev->num_writers);
-         dev->num_writers = 0;
-      }
-      unlock_device(dev);
-   }
+   Dmsg0(500, "Enter detach_dcr_from_dev\n"); /* jcr is NULL in some cases */
 
    /* Detach this dcr only if attached */
-   if (dcr->attached_to_dev) {
+   if (dcr->attached_to_dev && dev) {
+      dev->dlock();
+      dcr->unreserve_device();
       dcr->dev->attached_dcrs->remove(dcr);  /* detach dcr from device */
       dcr->attached_to_dev = false;
 //    remove_dcr_from_dcrs(dcr);      /* remove dcr from jcr list */
+      dev->dunlock();
    }
-   free_unused_volume(dcr);           /* free unused vols attached to this dcr */
-   pthread_cond_broadcast(&dcr->dev->wait_next_vol);
-   pthread_cond_broadcast(&wait_device_release);
 }
 
 /*
@@ -643,9 +661,7 @@ void free_dcr(DCR *dcr)
 {
    JCR *jcr = dcr->jcr;
 
-   if (dcr->dev) {
-      detach_dcr_from_dev(dcr);
-   }
+   detach_dcr_from_dev(dcr);
 
    if (dcr->block) {
       free_block(dcr->block);
@@ -658,3 +674,16 @@ void free_dcr(DCR *dcr)
    }
    free(dcr);
 }
+
+static void set_dcr_from_vol(DCR *dcr, VOL_LIST *vol)
+{
+   /*    
+    * Note, if we want to be able to work from a .bsr file only          
+    *  for disaster recovery, we must "simulate" reading the catalog
+    */
+   bstrncpy(dcr->VolumeName, vol->VolumeName, sizeof(dcr->VolumeName));
+   bstrncpy(dcr->VolCatInfo.VolCatName, vol->VolumeName, sizeof(dcr->VolCatInfo.VolCatName));
+   bstrncpy(dcr->media_type, vol->MediaType, sizeof(dcr->media_type));
+   dcr->VolCatInfo.Slot = vol->Slot;
+   dcr->VolCatInfo.InChanger = vol->Slot > 0; 
+}