C++ DEVICE::can_write方法代码示例

//.........这里部分代码省略.........
            Jmsg1(jcr, M_FATAL, 0, _("Network error reading from FD. ERR=%s\n"),
                  fd->bstrerror());
            possible_incomplete_job(jcr, last_file_index);
         }
         ok = false;
         break;
      }
   }

   /* Create Job status for end of session label */
   jcr->setJobStatus(ok?JS_Terminated:JS_ErrorTerminated);

   if (ok) {
      /* Terminate connection with FD */
      fd->fsend(OK_append);
      do_fd_commands(jcr);               /* finish dialog with FD */
   } else {
      fd->fsend("3999 Failed append\n");
   }

   /*
    * Don't use time_t for job_elapsed as time_t can be 32 or 64 bits,
    *   and the subsequent Jmsg() editing will break
    */
   int32_t job_elapsed = time(NULL) - jcr->run_time;

   if (job_elapsed <= 0) {
      job_elapsed = 1;
   }

   Jmsg(dcr->jcr, M_INFO, 0, _("Job write elapsed time = %02d:%02d:%02d, Transfer rate = %s Bytes/second\n"),
         job_elapsed / 3600, job_elapsed % 3600 / 60, job_elapsed % 60,
         edit_uint64_with_suffix(jcr->JobBytes / job_elapsed, ec));


   Dmsg1(200, "Write EOS label JobStatus=%c\n", jcr->JobStatus);

   /*
    * Check if we can still write. This may not be the case
    *  if we are at the end of the tape or we got a fatal I/O error.
    */
   if (ok || dev->can_write()) {
      if (!write_session_label(dcr, EOS_LABEL)) {
         /* Print only if ok and not cancelled to avoid spurious messages */
         if (ok && !jcr->is_job_canceled()) {
            Jmsg1(jcr, M_FATAL, 0, _("Error writing end session label. ERR=%s\n"),
                  dev->bstrerror());
            possible_incomplete_job(jcr, last_file_index);
         }
         jcr->setJobStatus(JS_ErrorTerminated);
         ok = false;
      }
      if (dev->VolCatInfo.VolCatName[0] == 0) {
         Pmsg0(000, _("NULL Volume name. This shouldn't happen!!!\n"));
         Dmsg0(000, _("NULL Volume name. This shouldn't happen!!!\n"));
      }
      Dmsg0(90, "back from write_end_session_label()\n");
      /* Flush out final partial block of this session */
      if (!write_block_to_device(dcr)) {
         /* Print only if ok and not cancelled to avoid spurious messages */
         if (ok && !jcr->is_job_canceled()) {
            Jmsg2(jcr, M_FATAL, 0, _("Fatal append error on device %s: ERR=%s\n"),
                  dev->print_name(), dev->bstrerror());
            Dmsg0(100, _("Set ok=FALSE after write_block_to_device.\n"));
            possible_incomplete_job(jcr, last_file_index);
         }
         jcr->setJobStatus(JS_ErrorTerminated);
         ok = false;
      }
   }


   if (!ok && !jcr->is_JobStatus(JS_Incomplete)) {
      discard_data_spool(dcr);
   } else {
      /* Note: if commit is OK, the device will remain blocked */
      commit_data_spool(dcr);
   }

   if (ok) {
      ok = dvd_close_job(dcr);  /* do DVD cleanup if any */
   }
   
   /*
    * Release the device -- and send final Vol info to DIR
    *  and unlock it.
    */
   release_device(dcr);

   if ((!ok || jcr->is_job_canceled()) && !jcr->is_JobStatus(JS_Incomplete)) {
      discard_attribute_spool(jcr);
   } else {
      commit_attribute_spool(jcr);
   }

   dir_send_job_status(jcr);          /* update director */

   Dmsg1(100, "return from do_append_data() ok=%d\n", ok);
   return ok;
}

//.........这里部分代码省略.........

      if (fd->is_error()) {
         if (!jcr->is_job_canceled()) {
            Dmsg1(350, "Network read error from FD. ERR=%s\n", fd->bstrerror());
            Jmsg1(jcr, M_FATAL, 0, _("Network error reading from FD. ERR=%s\n"),
                  fd->bstrerror());
            possible_incomplete_job(jcr, last_file_index);
         }
         ok = false;
         break;
      }
   }

   qfd->wait_read_sock();
   free_GetMsg(qfd);

   if (eblock != NULL) {
      free_pool_memory(eblock);
   }

   /* Create Job status for end of session label */
   jcr->setJobStatus(ok?JS_Terminated:JS_ErrorTerminated);

   if (ok) {
      /* Terminate connection with Client */
      fd->fsend(OK_append);
      do_client_commands(jcr);            /* finish dialog with Client */
   } else {
      fd->fsend("3999 Failed append\n");
   }

   Dmsg1(200, "Write EOS label JobStatus=%c\n", jcr->JobStatus);

   /*
    * Check if we can still write. This may not be the case
    *  if we are at the end of the tape or we got a fatal I/O error.
    */
   if (ok || dev->can_write()) {
      if (!write_session_label(dcr, EOS_LABEL)) {
         /* Print only if ok and not cancelled to avoid spurious messages */
         if (ok && !jcr->is_job_canceled()) {
            Jmsg1(jcr, M_FATAL, 0, _("Error writing end session label. ERR=%s\n"),
                  dev->bstrerror());
            possible_incomplete_job(jcr, last_file_index);
         }
         jcr->setJobStatus(JS_ErrorTerminated);
         ok = false;
      }
      /* Flush out final partial block of this session */
      if (!dcr->write_final_block_to_device()) {
         /* Print only if ok and not cancelled to avoid spurious messages */
         if (ok && !jcr->is_job_canceled()) {
            Jmsg2(jcr, M_FATAL, 0, _("Fatal append error on device %s: ERR=%s\n"),
                  dev->print_name(), dev->bstrerror());
            Dmsg0(100, _("Set ok=FALSE after write_final_block_to_device.\n"));
            possible_incomplete_job(jcr, last_file_index);
         }
         jcr->setJobStatus(JS_ErrorTerminated);
         ok = false;
      }
   }
   flush_jobmedia_queue(jcr);
   if (!ok && !jcr->is_JobStatus(JS_Incomplete)) {
      discard_data_spool(dcr);
   } else {
      /* Note: if commit is OK, the device will remain blocked */
      commit_data_spool(dcr);
   }

   /*
    * Don't use time_t for job_elapsed as time_t can be 32 or 64 bits,
    *   and the subsequent Jmsg() editing will break
    */
   int32_t job_elapsed = time(NULL) - jcr->run_time;

   if (job_elapsed <= 0) {
      job_elapsed = 1;
   }

   Jmsg(dcr->jcr, M_INFO, 0, _("Elapsed time=%02d:%02d:%02d, Transfer rate=%s Bytes/second\n"),
         job_elapsed / 3600, job_elapsed % 3600 / 60, job_elapsed % 60,
         edit_uint64_with_suffix(jcr->JobBytes / job_elapsed, ec));

   /*
    * Release the device -- and send final Vol info to DIR
    *  and unlock it.
    */
   release_device(dcr);

   if ((!ok || jcr->is_job_canceled()) && !jcr->is_JobStatus(JS_Incomplete)) {
      discard_attribute_spool(jcr);
   } else {
      commit_attribute_spool(jcr);
   }

   jcr->sendJobStatus();          /* update director */

   Dmsg1(100, "return from do_append_data() ok=%d\n", ok);
   return ok;
}

/*
 * This job is done, so release the device. From a Unix standpoint,
 *  the device remains open.
 *
 * Note, if we were spooling, we may enter with the device blocked.
 *   We unblock at the end, only if it was us who blocked the
 *   device.
 *
 */
bool release_device(DCR *dcr)
{
   utime_t now;
   JCR *jcr = dcr->jcr;
   DEVICE *dev = dcr->dev;
   bool ok = true;
   char tbuf[100];
   int was_blocked = BST_NOT_BLOCKED;

   /*
    * Capture job statistics now that we are done using this device.
    */
   now = (utime_t)time(NULL);
   update_job_statistics(jcr, now);

   dev->Lock();
   if (!dev->is_blocked()) {
      block_device(dev, BST_RELEASING);
   } else {
      was_blocked = dev->blocked();
      dev->set_blocked(BST_RELEASING);
   }
   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
    */
   dcr->clear_reserved();

   if (dev->can_read()) {
      VOLUME_CAT_INFO *vol = &dev->VolCatInfo;
      dev->clear_read();              /* clear read bit */
      Dmsg2(150, "dir_update_vol_info. label=%d Vol=%s\n",
         dev->is_labeled(), vol->VolCatName);
      if (dev->is_labeled() && vol->VolCatName[0] != 0) {
         dcr->dir_update_volume_info(false, false); /* send Volume info to Director */
         remove_read_volume(jcr, dcr->VolumeName);
         volume_unused(dcr);
      }
   } else if (dev->num_writers > 0) {
      /*
       * Note if WEOT is set, we are at the end of the tape and may not be positioned correctly,
       * so the job_media_record and update_vol_info have already been done,
       * which means we skip them here.
       */
      dev->num_writers--;
      Dmsg1(100, "There are %d writers in release_device\n", dev->num_writers);
      if (dev->is_labeled()) {
         Dmsg2(200, "dir_create_jobmedia. Release vol=%s dev=%s\n",
               dev->getVolCatName(), dev->print_name());
         if (!dev->at_weot() && !dcr->dir_create_jobmedia_record(false)) {
            Jmsg2(jcr, M_FATAL, 0, _("Could not create JobMedia record for Volume=\"%s\" Job=%s\n"),
               dcr->getVolCatName(), jcr->Job);
         }

         /*
          * 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 */

            /*
             * Note! do volume update before close, which zaps VolCatInfo
             */
            dcr->dir_update_volume_info(false, false); /* send Volume info to Director */
            Dmsg2(200, "dir_update_vol_info. Release vol=%s dev=%s\n",
                  dev->getVolCatName(), dev->print_name());
         }
         if (dev->num_writers == 0) {         /* if not being used */
            volume_unused(dcr);               /*  we obviously are not using the volume */
         }
      }

   } else {
      /*
       * If we reach here, it is most likely because the job has failed,
       * since the device is not in read mode and there are no writers.
       * It was probably reserved.
       */
      volume_unused(dcr);
   }

   Dmsg3(100, "%d writers, %d reserve, dev=%s\n", dev->num_writers, dev->num_reserved(), dev->print_name());

   /*
    * If no writers, close if file or !CAP_ALWAYS_OPEN
//.........这里部分代码省略.........

//.........这里部分代码省略.........
         goto bail_out;
      }

      if (!begin_attribute_spool(jcr)) {
         ok = false;
         goto bail_out;
      }

      jcr->dcr->VolFirstIndex = jcr->dcr->VolLastIndex = 0;
      jcr->run_time = time(NULL);
      set_start_vol_position(jcr->dcr);
      jcr->JobFiles = 0;

      /*
       * Read all data and make a local clone of it.
       */
      ok = read_records(jcr->read_dcr, clone_record_internally, mount_next_read_volume);
   }

bail_out:
   if (!ok) {
      jcr->setJobStatus(JS_ErrorTerminated);
   }

   if (!jcr->remote_replicate && jcr->dcr) {
      /*
       * Don't use time_t for job_elapsed as time_t can be 32 or 64 bits,
       *   and the subsequent Jmsg() editing will break
       */
      int32_t job_elapsed;

      dev = jcr->dcr->dev;
      Dmsg1(100, "ok=%d\n", ok);
      if (ok || dev->can_write()) {
         /*
          * Flush out final partial block of this session
          */
         if (!jcr->dcr->write_block_to_device()) {
            Jmsg2(jcr, M_FATAL, 0, _("Fatal append error on device %s: ERR=%s\n"),
                  dev->print_name(), dev->bstrerror());
            Dmsg0(100, _("Set ok=FALSE after write_block_to_device.\n"));
            ok = false;
         }
         Dmsg2(200, "Flush block to device pos %u:%u\n", dev->file, dev->block_num);
      }

      if (!ok) {
         discard_data_spool(jcr->dcr);
      } else {
         /*
          * Note: if commit is OK, the device will remain blocked
          */
         commit_data_spool(jcr->dcr);
      }

      job_elapsed = time(NULL) - jcr->run_time;
      if (job_elapsed <= 0) {
         job_elapsed = 1;
      }

      Jmsg(jcr, M_INFO, 0, _("Elapsed time=%02d:%02d:%02d, Transfer rate=%s Bytes/second\n"),
           job_elapsed / 3600, job_elapsed % 3600 / 60, job_elapsed % 60,
           edit_uint64_with_suffix(jcr->JobBytes / job_elapsed, ec1));

      /*
       * Release the device -- and send final Vol info to DIR