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Sourcecode: bacula version File versions

dircmd.c

/*
 *  This file handles accepting Director Commands
 *
 *    Most Director commands are handled here, with the 
 *    exception of the Job command command and subsequent 
 *    subcommands that are handled
 *    in job.c.  
 *
 *    N.B. in this file, in general we must use P(dev->mutex) rather
 *    than lock_device(dev) so that we can examine the blocked
 *      state rather than blocking ourselves. In some "safe" cases,
 *    we can do things to a blocked device. CAREFUL!!!!
 *
 *    File daemon commands are handled in fdcmd.c
 *
 *     Kern Sibbald, May MMI
 *
 *   Version $Id: dircmd.c,v 1.80 2004/11/24 17:16:44 kerns Exp $
 *  
 */
/*
   Copyright (C) 2001-2004 Kern Sibbald and John Walker

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2 of
   the License, or (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public
   License along with this program; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
   MA 02111-1307, USA.

 */

#include "bacula.h"
#include "stored.h"

/* Exported variables */

/* Imported variables */
extern BSOCK *filed_chan;
extern int r_first, r_last;
extern struct s_res resources[];
extern char my_name[];
extern time_t daemon_start_time;
extern struct s_last_job last_job;

/* Static variables */
static char derrmsg[]       = "3900 Invalid command\n";
static char OKsetdebug[]   = "3000 OK setdebug=%d\n";
static char illegal_cmd[] = "3997 Illegal command for a Director with Monitor directive enabled\n";

/* Imported functions */
extern void terminate_child();
extern bool job_cmd(JCR *jcr);
extern bool status_cmd(JCR *sjcr);
extern bool qstatus_cmd(JCR *jcr);

/* Forward referenced functions */
static bool label_cmd(JCR *jcr);
static bool relabel_cmd(JCR *jcr);
static bool readlabel_cmd(JCR *jcr);
static bool release_cmd(JCR *jcr);
static bool setdebug_cmd(JCR *jcr);
static bool cancel_cmd(JCR *cjcr);
static bool mount_cmd(JCR *jcr);
static bool unmount_cmd(JCR *jcr);
static bool autochanger_cmd(JCR *sjcr);
static bool do_label(JCR *jcr, int relabel);
static DEVICE *find_device(JCR *jcr, POOL_MEM &dname);
static void read_volume_label(JCR *jcr, DEVICE *dev, int Slot);
static void label_volume_if_ok(JCR *jcr, DEVICE *dev, char *oldname,
                         char *newname, char *poolname, 
                         int Slot, int relabel);
static bool try_autoload_device(JCR *jcr, int slot, const char *VolName);

struct s_cmds {
   const char *cmd;
   bool (*func)(JCR *jcr);
   int monitoraccess; /* specify if monitors have access to this function */
};

/*  
 * The following are the recognized commands from the Director. 
 */
static struct s_cmds cmds[] = {
   {"JobId=",      job_cmd,         0},     /* start Job */
   {"autochanger", autochanger_cmd, 0},
   {"bootstrap",   bootstrap_cmd,   0},
   {"cancel",      cancel_cmd,      0},
   {"label",       label_cmd,       0},     /* label a tape */
   {"mount",       mount_cmd,       0},
   {"readlabel",   readlabel_cmd,   0},
   {"release",     release_cmd,     0},
   {"relabel",     relabel_cmd,     0},     /* relabel a tape */
   {"setdebug=",   setdebug_cmd,    0},     /* set debug level */
   {"status",      status_cmd,      1},
   {".status",     qstatus_cmd,     1},
   {"unmount",     unmount_cmd,     0},
   {NULL,    NULL}                      /* list terminator */
};


/* 
 * Connection request. We accept connections either from the 
 *  Director or a Client (File daemon).
 * 
 * Note, we are running as a seperate thread of the Storage daemon.
 *  and it is because a Director has made a connection with
 *  us on the "Message" channel.    
 *
 * Basic tasks done here:  
 *  - Create a JCR record
 *  - If it was from the FD, call handle_filed_connection()
 *  - Authenticate the Director
 *  - We wait for a command
 *  - We execute the command
 *  - We continue or exit depending on the return status
 */
void *handle_connection_request(void *arg)
{
   BSOCK *bs = (BSOCK *)arg;
   JCR *jcr;
   int i;
   bool found, quit;
   int bnet_stat = 0;
   char name[MAX_NAME_LENGTH];

   if (bnet_recv(bs) <= 0) {
      Emsg0(M_ERROR, 0, _("Connection request failed.\n"));
      bnet_close(bs);
      return NULL;
   }

   /* 
    * Do a sanity check on the message received
    */
   if (bs->msglen < 25 || bs->msglen > (int)sizeof(name)-25) {
      Emsg1(M_ERROR, 0, _("Invalid connection. Len=%d\n"), bs->msglen);
      bnet_close(bs);
      return NULL;
   }
   /* 
    * See if this is a File daemon connection. If so
    * call FD handler.
    */
   Dmsg1(110, "Conn: %s", bs->msg);
   if (sscanf(bs->msg, "Hello Start Job %127s", name) == 1) {
      handle_filed_connection(bs, name);
      return NULL;
   }
   
   Dmsg0(110, "Start Dir Job\n");
   jcr = new_jcr(sizeof(JCR), stored_free_jcr); /* create Job Control Record */
   jcr->dir_bsock = bs;             /* save Director bsock */
   jcr->dir_bsock->jcr = jcr;
   /* Initialize FD start condition variable */
   int errstat = pthread_cond_init(&jcr->job_start_wait, NULL);
   if (errstat != 0) {
      Jmsg1(jcr, M_FATAL, 0, _("Unable to init job cond variable: ERR=%s\n"), strerror(errstat));
      goto bail_out;
   }

   Dmsg0(1000, "stored in start_job\n");

   /*
    * Authenticate the Director
    */
   if (!authenticate_director(jcr)) {
      Jmsg(jcr, M_FATAL, 0, _("Unable to authenticate Director\n"));
      goto bail_out;
   }
   Dmsg0(90, "Message channel init completed.\n");

   for (quit=0; !quit;) {
      /* Read command */
      if ((bnet_stat = bnet_recv(bs)) <= 0) {
       break;           /* connection terminated */
      }
      Dmsg1(199, "<dird: %s\n", bs->msg);
      found = false;
      for (i=0; cmds[i].cmd; i++) {
      if (strncmp(cmds[i].cmd, bs->msg, strlen(cmds[i].cmd)) == 0) {
         if ((!cmds[i].monitoraccess) && (jcr->director->monitor)) {
              Dmsg1(100, "Command %s illegal.\n", cmds[i].cmd);
            bnet_fsend(bs, illegal_cmd);
            bnet_sig(bs, BNET_EOD);
            break;
         }
         if (!cmds[i].func(jcr)) { /* do command */
            quit = true; /* error, get out */
              Dmsg1(190, "Command %s requsts quit\n", cmds[i].cmd);
         }
         found = true;       /* indicate command found */
         break;
      }
      }
      if (!found) {                 /* command not found */
      bnet_fsend(bs, derrmsg);
      break;
      }
   }
bail_out:
   dequeue_messages(jcr);           /* send any queued messages */
   bnet_sig(bs, BNET_TERMINATE);
   free_jcr(jcr);
   return NULL;
}

/*
 * Set debug level as requested by the Director
 *
 */
static bool setdebug_cmd(JCR *jcr)
{
   BSOCK *dir = jcr->dir_bsock;
   int level, trace_flag;

   Dmsg1(10, "setdebug_cmd: %s", dir->msg);
   if (sscanf(dir->msg, "setdebug=%d trace=%d", &level, &trace_flag) != 2 || level < 0) {
      bnet_fsend(dir, "3991 Bad setdebug command: %s\n", dir->msg);
      return 0;
   }
   debug_level = level;
   set_trace(trace_flag);
   return bnet_fsend(dir, OKsetdebug, level);
}


/*
 * Cancel a Job
 */
static bool cancel_cmd(JCR *cjcr)
{
   BSOCK *dir = cjcr->dir_bsock;
   int oldStatus;
   char Job[MAX_NAME_LENGTH];
   JCR *jcr;

   if (sscanf(dir->msg, "cancel Job=%127s", Job) == 1) {
      if (!(jcr=get_jcr_by_full_name(Job))) {
         bnet_fsend(dir, _("3992 Job %s not found.\n"), Job);
      } else {
       P(jcr->mutex);
       oldStatus = jcr->JobStatus;
       set_jcr_job_status(jcr, JS_Canceled);
       if (!jcr->authenticated && oldStatus == JS_WaitFD) {
          pthread_cond_signal(&jcr->job_start_wait); /* wake waiting thread */
       }
       V(jcr->mutex);
       if (jcr->file_bsock) {
          bnet_sig(jcr->file_bsock, BNET_TERMINATE);
       }
       /* If thread waiting on mount, wake him */
       if (jcr->dcr && jcr->dcr->dev &&
            (jcr->dcr->dev->dev_blocked == BST_WAITING_FOR_SYSOP ||
             jcr->dcr->dev->dev_blocked == BST_UNMOUNTED ||
             jcr->dcr->dev->dev_blocked == BST_UNMOUNTED_WAITING_FOR_SYSOP)) {
           pthread_cond_signal(&jcr->dcr->dev->wait_next_vol);
       }
         bnet_fsend(dir, _("3000 Job %s marked to be canceled.\n"), jcr->Job);
       free_jcr(jcr);
      }
   } else {
      bnet_fsend(dir, _("3993 Error scanning cancel command.\n"));
   }
   bnet_sig(dir, BNET_EOD);
   return 1;
}

/*
 * Label a tape
 *
 */
static bool label_cmd(JCR *jcr) 
{
   return do_label(jcr, 0);
}

static bool relabel_cmd(JCR *jcr) 
{
   return do_label(jcr, 1);
}

static bool do_label(JCR *jcr, int relabel)  
{
   POOLMEM *newname, *oldname, *poolname, *mtype;
   POOL_MEM dname;
   BSOCK *dir = jcr->dir_bsock;
   DEVICE *dev;
   bool ok = false;
   int slot;      

   newname = get_memory(dir->msglen+1);
   oldname = get_memory(dir->msglen+1);
   poolname = get_memory(dir->msglen+1);
   mtype = get_memory(dir->msglen+1);
   if (relabel) {
      if (sscanf(dir->msg, "relabel %127s OldName=%127s NewName=%127s PoolName=%127s MediaType=%127s Slot=%d",
        dname.c_str(), oldname, newname, poolname, mtype, &slot) == 6) {
       ok = true;
      }
   } else {
      *oldname = 0;
      if (sscanf(dir->msg, "label %127s VolumeName=%127s PoolName=%127s MediaType=%127s Slot=%d",
        dname.c_str(), newname, poolname, mtype, &slot) == 5) {
       ok = true;
      }
   }
   if (ok) {
      unbash_spaces(newname);
      unbash_spaces(oldname);
      unbash_spaces(poolname);
      unbash_spaces(mtype);
      dev = find_device(jcr, dname);
      if (dev) {
       /******FIXME**** compare MediaTypes */
       P(dev->mutex);         /* Use P to avoid indefinite block */
       if (!(dev->state & ST_OPENED)) {
          label_volume_if_ok(jcr, dev, oldname, newname, poolname, slot, relabel);
          force_close_dev(dev);
         /* Under certain "safe" conditions, we can steal the lock */
       } else if (dev->dev_blocked && 
                (dev->dev_blocked == BST_UNMOUNTED ||
                 dev->dev_blocked == BST_WAITING_FOR_SYSOP ||
                 dev->dev_blocked == BST_UNMOUNTED_WAITING_FOR_SYSOP)) {
          label_volume_if_ok(jcr, dev, oldname, newname, poolname, slot, relabel);
       } else if (dev_state(dev, ST_READ) || dev->num_writers) {
          if (dev_state(dev, ST_READ)) {
                bnet_fsend(dir, _("3911 Device %s is busy with 1 reader.\n"),
               dev_name(dev));
          } else {
                bnet_fsend(dir, _("3912 Device %s is busy with %d writer(s).\n"),
               dev_name(dev), dev->num_writers);
          }
       } else {               /* device not being used */
          label_volume_if_ok(jcr, dev, oldname, newname, poolname, slot, relabel);
       }
       V(dev->mutex);
      } else {
         bnet_fsend(dir, _("3999 Device \"%s\" not found\n"), dname.c_str());
      }
   } else {
      /* NB dir->msg gets clobbered in bnet_fsend, so save command */
      pm_strcpy(jcr->errmsg, dir->msg);
      bnet_fsend(dir, _("3903 Error scanning label command: %s\n"), jcr->errmsg);
   }
   free_memory(oldname);
   free_memory(newname);
   free_memory(poolname);
   free_memory(mtype);
   bnet_sig(dir, BNET_EOD);
   return true;
}

/* 
 * Read the tape label and determine if we can safely
 * label the tape (not a Bacula volume), then label it.
 *
 *  Enter with the mutex set
 */
static void label_volume_if_ok(JCR *jcr, DEVICE *dev, char *oldname, 
                         char *newname, char *poolname,
                         int slot, int relabel)
{
   BSOCK *dir = jcr->dir_bsock;
   bsteal_lock_t hold;
   DCR *dcr = jcr->dcr;
   int label_status;
   
   dcr->dev = dev;
   steal_device_lock(dev, &hold, BST_WRITING_LABEL);
   
   if (!try_autoload_device(jcr, slot, newname)) {
      goto bail_out;                /* error */
   }

   /* See what we have for a Volume */
   label_status = read_dev_volume_label(dcr);                
   switch(label_status) {
   case VOL_NAME_ERROR:
   case VOL_VERSION_ERROR:
   case VOL_LABEL_ERROR:
   case VOL_OK:
      if (!relabel) {
       bnet_fsend(dir, _(
            "3911 Cannot label Volume because it is already labeled: \"%s\"\n"), 
           dev->VolHdr.VolName);
       break;
      }
      /* Relabel request. If oldname matches, continue */
      if (strcmp(oldname, dev->VolHdr.VolName) != 0) {
         bnet_fsend(dir, _("Wrong volume mounted.\n"));
       break;
      }
      /* Fall through wanted! */
   case VOL_IO_ERROR:
   case VOL_NO_LABEL:
      if (!write_new_volume_label_to_dev(dcr, newname, poolname)) {
         bnet_fsend(dir, _("3912 Failed to label Volume: ERR=%s\n"), strerror_dev(dev));
       break;
      }
      bstrncpy(dcr->VolumeName, newname, sizeof(dcr->VolumeName));
      /* The following 3000 OK label. string is scanned in ua_label.c */
      bnet_fsend(dir, "3000 OK label. Volume=%s Device=%s\n", 
       newname, dev_name(dev));
      break;
   case VOL_NO_MEDIA:
      bnet_fsend(dir, _("3912 Failed to label Volume: ERR=%s\n"), strerror_dev(dev));
      break;
   default:
      bnet_fsend(dir, _("3913 Cannot label Volume. \
Unknown status %d from read_volume_label()\n"), label_status);
      break;
   }

bail_out:
   give_back_device_lock(dev, &hold);
   return;
}


/* 
 * Read the tape label
 *
 *  Enter with the mutex set
 */
static bool read_label(DCR *dcr)
{
   int ok;
   JCR *jcr = dcr->jcr;
   BSOCK *dir = jcr->dir_bsock;
   bsteal_lock_t hold;
   DEVICE *dev = dcr->dev;
   
   steal_device_lock(dev, &hold, BST_DOING_ACQUIRE);
   
   dcr->VolumeName[0] = 0;
   dev->state &= ~ST_LABEL;         /* force read of label */
   switch (read_dev_volume_label(dcr)) {        
   case VOL_OK:
      bnet_fsend(dir, _("3001 Mounted Volume: %s\n"), dev->VolHdr.VolName);
      ok = true;
      break;
   default:
      bnet_fsend(dir, _("3902 Cannot mount Volume on Storage Device \"%s\" because:\n%s"),
       dev_name(dev), jcr->errmsg);
      ok = false;
      break;
   }
   give_back_device_lock(dev, &hold);
   return ok;
}

static DEVICE *find_device(JCR *jcr, POOL_MEM &dname)
{
   DEVRES *device;
   bool found = false;

   unbash_spaces(dname);
   LockRes();
   foreach_res(device, R_DEVICE) {
      /* Find resource, and make sure we were able to open it */
      if (strcmp(device->hdr.name, dname.c_str()) == 0 && device->dev) {
         Dmsg1(20, "Found device %s\n", device->hdr.name);
       jcr->device = device;
       found = true;
       break;
      }
   }
   if (found) {
      /*
       * ****FIXME*****  device->dev may not point to right device
       *  if there are multiple devices open
       */
      jcr->dcr = new_dcr(jcr, device->dev);
      UnlockRes();
      return jcr->dcr->dev;
   }
   UnlockRes();
   return NULL;
}


/*
 * Mount command from Director
 */
static bool mount_cmd(JCR *jcr)
{
   POOL_MEM dname;
   BSOCK *dir = jcr->dir_bsock;
   DEVICE *dev;
   DCR *dcr;

   if (sscanf(dir->msg, "mount %127s", dname.c_str()) == 1) {
      dev = find_device(jcr, dname);
      dcr = jcr->dcr;
      if (dev) {
       P(dev->mutex);         /* Use P to avoid indefinite block */
       switch (dev->dev_blocked) {       /* device blocked? */
       case BST_WAITING_FOR_SYSOP:
          /* Someone is waiting, wake him */
            Dmsg0(100, "Waiting for mount. Attempting to wake thread\n");
          dev->dev_blocked = BST_MOUNT;
            bnet_fsend(dir, "3001 OK mount. Device=%s\n", dev_name(dev));
          pthread_cond_signal(&dev->wait_next_vol);
          break;

       /* In both of these two cases, we (the user) unmounted the Volume */
       case BST_UNMOUNTED_WAITING_FOR_SYSOP:
       case BST_UNMOUNTED:
          /* We freed the device, so reopen it and wake any waiting threads */
          if (open_dev(dev, NULL, OPEN_READ_WRITE) < 0) {
               bnet_fsend(dir, _("3901 open device failed: ERR=%s\n"), 
              strerror_dev(dev));
             break;
          }
          read_dev_volume_label(dcr);
          if (dev->dev_blocked == BST_UNMOUNTED) {
             /* We blocked the device, so unblock it */
               Dmsg0(100, "Unmounted. Unblocking device\n");
             read_label(dcr);       /* this should not be necessary */
             unblock_device(dev);
          } else {
               Dmsg0(100, "Unmounted waiting for mount. Attempting to wake thread\n");
             dev->dev_blocked = BST_MOUNT;
          }
          if (dev_state(dev, ST_LABEL)) {
               bnet_fsend(dir, _("3001 Device %s is mounted with Volume \"%s\"\n"), 
              dev_name(dev), dev->VolHdr.VolName);
          } else {
               bnet_fsend(dir, _("3905 Device %s open but no Bacula volume is mounted.\n"
                                 "If this is not a blank tape, try unmounting and remounting the Volume.\n"),
                    dev_name(dev));
          }
          pthread_cond_signal(&dev->wait_next_vol);
          break;

       case BST_DOING_ACQUIRE:
            bnet_fsend(dir, _("3001 Device %s is mounted; doing acquire.\n"), 
                   dev_name(dev));
          break;

       case BST_WRITING_LABEL:
            bnet_fsend(dir, _("3903 Device %s is being labeled.\n"), dev_name(dev));
          break;

       case BST_NOT_BLOCKED:
          if (dev_state(dev, ST_OPENED)) {
             if (dev_state(dev, ST_LABEL)) {
                  bnet_fsend(dir, _("3001 Device %s is mounted with Volume \"%s\"\n"),
                 dev_name(dev), dev->VolHdr.VolName);
             } else {
                  bnet_fsend(dir, _("3905 Device %s open but no Bacula volume is mounted.\n"   
                                 "If this is not a blank tape, try unmounting and remounting the Volume.\n"),
                       dev_name(dev));
             }
          } else {
             if (!dev_is_tape(dev)) {
                  bnet_fsend(dir, _("3906 cannot mount non-tape.\n"));
              break;
             }
             if (open_dev(dev, NULL, OPEN_READ_WRITE) < 0) {
                  bnet_fsend(dir, _("3901 open device failed: ERR=%s\n"), 
                 strerror_dev(dev));
              break;
             }
             read_label(dcr);
             if (dev_state(dev, ST_LABEL)) {
                  bnet_fsend(dir, _("3001 Device %s is already mounted with Volume \"%s\"\n"), 
                 dev_name(dev), dev->VolHdr.VolName);
             } else {
                  bnet_fsend(dir, _("3905 Device %s open but no Bacula volume is mounted.\n"
                                    "If this is not a blank tape, try unmounting and remounting the Volume.\n"),
                       dev_name(dev));
             }
          }
          break;

       default:
            bnet_fsend(dir, _("3905 Bizarre wait state %d\n"), dev->dev_blocked);
          break;
       }
       V(dev->mutex);
      } else {
         bnet_fsend(dir, _("3999 Device \"%s\" not found\n"), dname.c_str());
      }
   } else {
      pm_strcpy(jcr->errmsg, dir->msg);
      bnet_fsend(dir, _("3909 Error scanning mount command: %s\n"), jcr->errmsg);
   }
   bnet_sig(dir, BNET_EOD);
   return true;
}

/*
 * unmount command from Director
 */
static bool unmount_cmd(JCR *jcr)
{
   POOL_MEM dname;
   BSOCK *dir = jcr->dir_bsock;
   DEVICE *dev;

   if (sscanf(dir->msg, "unmount %127s", dname.c_str()) == 1) {
      dev = find_device(jcr, dname);
      if (dev) {
       P(dev->mutex);         /* Use P to avoid indefinite block */
       if (!(dev->state & ST_OPENED)) {
            Dmsg0(90, "Device already unmounted\n");
            bnet_fsend(dir, _("3901 Device \"%s\" is already unmounted.\n"), dev_name(dev));

       } else if (dev->dev_blocked == BST_WAITING_FOR_SYSOP) {
            Dmsg2(90, "%d waiter dev_block=%d. doing unmount\n", dev->num_waiting,
             dev->dev_blocked);
          open_dev(dev, NULL, 0);   /* fake open for close */
          offline_or_rewind_dev(dev);
          force_close_dev(dev);
          dev->dev_blocked = BST_UNMOUNTED_WAITING_FOR_SYSOP;
            bnet_fsend(dir, _("3001 Device \"%s\" unmounted.\n"), dev_name(dev));

       } else if (dev->dev_blocked == BST_DOING_ACQUIRE) {
            bnet_fsend(dir, _("3902 Device \"%s\" is busy in acquire.\n"), dev_name(dev));

       } else if (dev->dev_blocked == BST_WRITING_LABEL) {
            bnet_fsend(dir, _("3903 Device \"%s\" is being labeled.\n"), dev_name(dev));

       } else if (dev_state(dev, ST_READ) || dev->num_writers) {
          if (dev_state(dev, ST_READ)) {
                Dmsg0(90, "Device in read mode\n");
                bnet_fsend(dir, _("3904 Device \"%s\" is busy reading.\n"), dev_name(dev));
          } else {
                Dmsg1(90, "Device busy with %d writers\n", dev->num_writers);
                bnet_fsend(dir, _("3905 Device %s is busy with %d writer(s).\n"),
               dev_name(dev), dev->num_writers);
          }

       } else {               /* device not being used */
            Dmsg0(90, "Device not in use, unmounting\n");
          /* On FreeBSD, I am having ASSERT() failures in block_device()
           * and I can only imagine that the thread id that we are
           * leaving in no_wait_id is being re-used. So here,
           * we simply do it by hand.  Gross, but a solution.
           */
          /*      block_device(dev, BST_UNMOUNTED); replace with 2 lines below */
          dev->dev_blocked = BST_UNMOUNTED;
          dev->no_wait_id = 0;
          open_dev(dev, NULL, 0);   /* fake open for close */
          offline_or_rewind_dev(dev);
          force_close_dev(dev);
            bnet_fsend(dir, _("3002 Device %s unmounted.\n"), dev_name(dev));
       }
       V(dev->mutex);
      } else {
         bnet_fsend(dir, _("3999 Device \"%s\" not found\n"), dname.c_str());
      }
   } else {
      /* NB dir->msg gets clobbered in bnet_fsend, so save command */
      pm_strcpy(jcr->errmsg, dir->msg);
      bnet_fsend(dir, _("3907 Error scanning unmount command: %s\n"), jcr->errmsg);
   }
   bnet_sig(dir, BNET_EOD);
   return true;
}

/*
 * Release command from Director. This rewinds the device and if
 *   configured does a offline and ensures that Bacula will
 *   re-read the label of the tape before continuing. This gives
 *   the operator the chance to change the tape anytime before the
 *   next job starts.
 */
static bool release_cmd(JCR *jcr)
{
   POOL_MEM dname;
   BSOCK *dir = jcr->dir_bsock;
   DEVICE *dev;

   if (sscanf(dir->msg, "release %127s", dname.c_str()) == 1) {
      dev = find_device(jcr, dname);
      if (dev) {
       P(dev->mutex);         /* Use P to avoid indefinite block */
       if (!(dev->state & ST_OPENED)) {
            Dmsg0(90, "Device already released\n");
            bnet_fsend(dir, _("3911 Device %s already released.\n"), dev_name(dev));

       } else if (dev->dev_blocked == BST_WAITING_FOR_SYSOP ||
                dev->dev_blocked == BST_UNMOUNTED_WAITING_FOR_SYSOP) {
            Dmsg2(90, "%d waiter dev_block=%d. doing unmount\n", dev->num_waiting,
             dev->dev_blocked);
            bnet_fsend(dir, _("3912 Device %s waiting for mount.\n"), dev_name(dev));

       } else if (dev->dev_blocked == BST_DOING_ACQUIRE) {
            bnet_fsend(dir, _("3913 Device %s is busy in acquire.\n"), dev_name(dev));

       } else if (dev->dev_blocked == BST_WRITING_LABEL) {
            bnet_fsend(dir, _("3914 Device %s is being labeled.\n"), dev_name(dev));

       } else if (dev_state(dev, ST_READ) || dev->num_writers) {
          if (dev_state(dev, ST_READ)) {
                Dmsg0(90, "Device in read mode\n");
                bnet_fsend(dir, _("3915 Device %s is busy with 1 reader.\n"), dev_name(dev));
          } else {
                Dmsg1(90, "Device busy with %d writers\n", dev->num_writers);
                bnet_fsend(dir, _("3916 Device %s is busy with %d writer(s).\n"),
               dev_name(dev), dev->num_writers);
          }

       } else {               /* device not being used */
            Dmsg0(90, "Device not in use, unmounting\n");
          release_volume(jcr->dcr);
            bnet_fsend(dir, _("3012 Device %s released.\n"), dev_name(dev));
       }
       V(dev->mutex);
      } else {
         bnet_fsend(dir, _("3999 Device \"%s\" not found\n"), dname.c_str());
      }
   } else {
      /* NB dir->msg gets clobbered in bnet_fsend, so save command */
      pm_strcpy(jcr->errmsg, dir->msg);
      bnet_fsend(dir, _("3917 Error scanning release command: %s\n"), jcr->errmsg);
   }
   bnet_sig(dir, BNET_EOD);
   return true;
}



/*
 * Autochanger command from Director
 */
static bool autochanger_cmd(JCR *jcr)
{
   POOL_MEM dname;
   BSOCK *dir = jcr->dir_bsock;
   DEVICE *dev;
   DCR *dcr;

   if (sscanf(dir->msg, "autochanger list %127s ", dname.c_str()) == 1) {
      dev = find_device(jcr, dname);
      dcr = jcr->dcr;
      if (dev) {
       P(dev->mutex);         /* Use P to avoid indefinite block */
       if (!dev_is_tape(dev)) {
            bnet_fsend(dir, _("3995 Device %s is not an autochanger.\n"), dev_name(dev));
       } else if (!(dev->state & ST_OPENED)) {
          autochanger_list(dcr, dir);
         /* Under certain "safe" conditions, we can steal the lock */
       } else if (dev->dev_blocked && 
                (dev->dev_blocked == BST_UNMOUNTED ||
                 dev->dev_blocked == BST_WAITING_FOR_SYSOP ||
                 dev->dev_blocked == BST_UNMOUNTED_WAITING_FOR_SYSOP)) {
          autochanger_list(dcr, dir);
       } else if (dev_state(dev, ST_READ) || dev->num_writers) {
          if (dev_state(dev, ST_READ)) {
                bnet_fsend(dir, _("3901 Device %s is busy with 1 reader.\n"), dev_name(dev));
          } else {
                bnet_fsend(dir, _("3902 Device %s is busy with %d writer(s).\n"),
               dev_name(dev), dev->num_writers);
          }
       } else {               /* device not being used */
          autochanger_list(dcr, dir);
       }
       V(dev->mutex);
      } else {
         bnet_fsend(dir, _("3999 Device \"%s\" not found\n"), dname.c_str());
      }
   } else {  /* error on scanf */
      pm_strcpy(jcr->errmsg, dir->msg);
      bnet_fsend(dir, _("3908 Error scanning autocharger list command: %s\n"),
       jcr->errmsg);
   }
   bnet_sig(dir, BNET_EOD);
   return true;
}

/*
 * Read and return the Volume label
 */
static bool readlabel_cmd(JCR *jcr)
{
   POOL_MEM dname;
   BSOCK *dir = jcr->dir_bsock;
   DEVICE *dev;
   int Slot;

   if (sscanf(dir->msg, "readlabel %127s Slot=%d", dname.c_str(), &Slot) == 2) {
      dev = find_device(jcr, dname);
      if (dev) {
       P(dev->mutex);         /* Use P to avoid indefinite block */
       if (!dev_state(dev, ST_OPENED)) {
          read_volume_label(jcr, dev, Slot);
          force_close_dev(dev);
         /* Under certain "safe" conditions, we can steal the lock */
       } else if (dev->dev_blocked && 
                (dev->dev_blocked == BST_UNMOUNTED ||
                 dev->dev_blocked == BST_WAITING_FOR_SYSOP ||
                 dev->dev_blocked == BST_UNMOUNTED_WAITING_FOR_SYSOP)) {
          read_volume_label(jcr, dev, Slot);
       } else if (dev_state(dev, ST_READ) || dev->num_writers) {
          if (dev_state(dev, ST_READ)) {
                bnet_fsend(dir, _("3911 Device %s is busy with 1 reader.\n"),
                      dev_name(dev));
          } else {
                bnet_fsend(dir, _("3912 Device %s is busy with %d writer(s).\n"),
               dev_name(dev), dev->num_writers);
          }
       } else {               /* device not being used */
          read_volume_label(jcr, dev, Slot);
       }
       V(dev->mutex);
      } else {
         bnet_fsend(dir, _("3999 Device \"%s\" not found\n"), dname.c_str());
      }
   } else {
      pm_strcpy(jcr->errmsg, dir->msg);
      bnet_fsend(dir, _("3909 Error scanning readlabel command: %s\n"), jcr->errmsg);
   }
   bnet_sig(dir, BNET_EOD);
   return true;
}

/* 
 * Read the tape label
 *
 *  Enter with the mutex set
 */
static void read_volume_label(JCR *jcr, DEVICE *dev, int Slot)
{
   BSOCK *dir = jcr->dir_bsock;
   bsteal_lock_t hold;
   DCR *dcr = jcr->dcr;

   dcr->dev = dev;
   steal_device_lock(dev, &hold, BST_WRITING_LABEL);
   
   if (!try_autoload_device(jcr, Slot, "")) {
      goto bail_out;                /* error */
   }

   dev->state &= ~ST_LABEL;         /* force read of label */
   switch (read_dev_volume_label(dcr)) {        
   case VOL_OK:
      /* DO NOT add quotes around the Volume name. It is scanned in the DIR */
      bnet_fsend(dir, _("3001 Volume=%s Slot=%d\n"), dev->VolHdr.VolName, Slot);
      Dmsg1(100, "Volume: %s\n", dev->VolHdr.VolName);
      break;
   default:
      bnet_fsend(dir, _("3902 Cannot mount Volume on Storage Device \"%s\" because:\n%s"),
             dev_name(dev), jcr->errmsg);
      break;
   }

bail_out:
   give_back_device_lock(dev, &hold);
   return;
}

static bool try_autoload_device(JCR *jcr, int slot, const char *VolName)
{
   DCR *dcr = jcr->dcr;
   BSOCK *dir = jcr->dir_bsock;
   DEVICE *dev = dcr->dev;

   bstrncpy(dcr->VolumeName, VolName, sizeof(dcr->VolumeName));
   dcr->VolCatInfo.Slot = slot;
   dcr->VolCatInfo.InChanger = slot > 0;
   if (autoload_device(dcr, 0, dir) < 0) {    /* autoload if possible */
      return false; 
   }

   /* Ensure that the device is open -- autoload_device() closes it */
   for ( ; !(dev->state & ST_OPENED); ) {
      if (open_dev(dev, dcr->VolumeName, OPEN_READ_WRITE) < 0) {
         bnet_fsend(dir, _("3910 Unable to open device %s. ERR=%s\n"), 
          dev_name(dev), strerror_dev(dev));
       return false;
      }
   }
   return true;
}

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