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scsi_serial.c

/*
 * scsi_serial.c
 *
 * Code related to requesting and getting an id from a scsi device
 *
 * Copyright (C) IBM Corp. 2003
 *
 *  This library is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as
 *  published by the Free Software Foundation; either version 2.1 of the
 *  License, or (at your option) any later version.
 *
 *  This library 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 *  USA
 */

#include <sys/types.h>
#include <sys/ioctl.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include <linux/compiler.h> /* need __user when built via klibc */
#include <scsi/sg.h>
#include <sysfs/libsysfs.h>
#include "scsi_id.h"
#include "scsi.h"

/*
 * A priority based list of id, naa, and binary/ascii for the identifier
 * descriptor in VPD page 0x83.
 *
 * Brute force search for a match starting with the first value in the
 * following id_search_list. This is not a performance issue, since there
 * is normally one or some small number of descriptors.
 */
static const struct scsi_id_search_values id_search_list[] = {
      { SCSI_ID_NAA,    SCSI_ID_NAA_IEEE_REG_EXTENDED,      SCSI_ID_BINARY },
      { SCSI_ID_NAA,    SCSI_ID_NAA_IEEE_REG_EXTENDED,      SCSI_ID_ASCII },
      { SCSI_ID_NAA,    SCSI_ID_NAA_IEEE_REG,   SCSI_ID_BINARY },
      { SCSI_ID_NAA,    SCSI_ID_NAA_IEEE_REG,   SCSI_ID_ASCII },
      /*
       * Devices already exist using NAA values that are now marked
       * reserved. These should not conflict with other values, or it is
       * a bug in the device. As long as we find the IEEE extended one
       * first, we really don't care what other ones are used. Using
       * don't care here means that a device that returns multiple
       * non-IEEE descriptors in a random order will get different
       * names.
       */
      { SCSI_ID_NAA,    SCSI_ID_NAA_DONT_CARE,  SCSI_ID_BINARY },
      { SCSI_ID_NAA,    SCSI_ID_NAA_DONT_CARE,  SCSI_ID_ASCII },
      { SCSI_ID_EUI_64, SCSI_ID_NAA_DONT_CARE,  SCSI_ID_BINARY },
      { SCSI_ID_EUI_64, SCSI_ID_NAA_DONT_CARE,  SCSI_ID_ASCII },
      { SCSI_ID_T10_VENDOR,   SCSI_ID_NAA_DONT_CARE,  SCSI_ID_BINARY },
      { SCSI_ID_T10_VENDOR,   SCSI_ID_NAA_DONT_CARE,  SCSI_ID_ASCII },
      { SCSI_ID_VENDOR_SPECIFIC,    SCSI_ID_NAA_DONT_CARE,  SCSI_ID_BINARY },
      { SCSI_ID_VENDOR_SPECIFIC,    SCSI_ID_NAA_DONT_CARE,  SCSI_ID_ASCII },
};

static const char hex_str[]="0123456789abcdef";

/*
 * Values returned in the result/status, only the ones used by the code
 * are used here.
 */

#define DID_NO_CONNECT 0x01     /* Unable to connect before timeout */

#define DID_BUS_BUSY 0x02       /* Bus remain busy until timeout */
#define DID_TIME_OUT 0x03       /* Timed out for some other reason */

#define DRIVER_TIMEOUT 0x06
#define DRIVER_SENSE 0x08       /* Sense_buffer has been set */

/* The following "category" function returns one of the following */
#define SG_ERR_CAT_CLEAN      0      /* No errors or other information */
#define SG_ERR_CAT_MEDIA_CHANGED    1 /* interpreted from sense buffer */
#define SG_ERR_CAT_RESET      2      /* interpreted from sense buffer */
#define SG_ERR_CAT_TIMEOUT    3
#define SG_ERR_CAT_RECOVERED  4  /* Successful command after recovered err */
#define SG_ERR_CAT_SENSE      98     /* Something else in the sense buffer */
#define SG_ERR_CAT_OTHER      99     /* Some other error/warning */

static int sg_err_category_new(int scsi_status, int msg_status, int
                         host_status, int driver_status, const
                         unsigned char *sense_buffer, int sb_len)
{
      scsi_status &= 0x7e;

      /*
       * XXX change to return only two values - failed or OK.
       */

      /*
       * checks msg_status
       */
      if (!scsi_status && !msg_status && !host_status && !driver_status)
            return SG_ERR_CAT_CLEAN;

      if ((scsi_status == SCSI_CHECK_CONDITION) ||
          (scsi_status == SCSI_COMMAND_TERMINATED) ||
          ((driver_status & 0xf) == DRIVER_SENSE)) {
            if (sense_buffer && (sb_len > 2)) {
                  int sense_key;
                  unsigned char asc;

                  if (sense_buffer[0] & 0x2) {
                        sense_key = sense_buffer[1] & 0xf;
                        asc = sense_buffer[2];
                  } else {
                        sense_key = sense_buffer[2] & 0xf;
                        asc = (sb_len > 12) ? sense_buffer[12] : 0;
                  }

                  if (sense_key == RECOVERED_ERROR)
                        return SG_ERR_CAT_RECOVERED;
                  else if (sense_key == UNIT_ATTENTION) {
                        if (0x28 == asc)
                              return SG_ERR_CAT_MEDIA_CHANGED;
                        if (0x29 == asc)
                              return SG_ERR_CAT_RESET;
                  }
            }
            return SG_ERR_CAT_SENSE;
      }
      if (!host_status) {
            if ((host_status == DID_NO_CONNECT) ||
                (host_status == DID_BUS_BUSY) ||
                (host_status == DID_TIME_OUT))
                  return SG_ERR_CAT_TIMEOUT;
      }
      if (!driver_status) {
            if (driver_status == DRIVER_TIMEOUT)
                  return SG_ERR_CAT_TIMEOUT;
      }
      return SG_ERR_CAT_OTHER;
}

static int sg_err_category3(struct sg_io_hdr *hp)
{
      return sg_err_category_new(hp->status, hp->msg_status,
                           hp->host_status, hp->driver_status,
                           hp->sbp, hp->sb_len_wr);
}

static int scsi_dump_sense(struct sysfs_device *scsi_dev, struct sg_io_hdr *io)
{
      unsigned char *sense_buffer;
      int s;
      int sb_len;
      int code;
      int sense_class;
      int sense_key;
      int descriptor_format;
      int asc, ascq;
#ifdef DUMP_SENSE
      char out_buffer[256];
      int i, j;
#endif

      /*
       * Figure out and print the sense key, asc and ascq.
       *
       * If you want to suppress these for a particular drive model, add
       * a black list entry in the scsi_id config file.
       *
       * XXX We probably need to: lookup the sense/asc/ascq in a retry
       * table, and if found return 1 (after dumping the sense, asc, and
       * ascq). So, if/when we get something like a power on/reset,
       * we'll retry the command.
       */

      dprintf("got check condition\n");

      sb_len = io->sb_len_wr;
      if (sb_len < 1) {
            log_message(LOG_WARNING, "%s: sense buffer empty\n",
                      scsi_dev->name);
            return -1;
      }

      sense_buffer = io->sbp;
      sense_class = (sense_buffer[0] >> 4) & 0x07;
      code = sense_buffer[0] & 0xf;

      if (sense_class == 7) {
            /*
             * extended sense data.
             */
            s = sense_buffer[7] + 8;
            if (sb_len < s) {
                  log_message(LOG_WARNING,
                            "%s: sense buffer too small %d bytes,"
                            " %d bytes too short\n", scsi_dev->name,
                            sb_len, s - sb_len);
                  return -1;
            }
            if ((code == 0x0) || (code == 0x1)) {
                  descriptor_format = 0;
                  sense_key = sense_buffer[2] & 0xf;
                  if (s < 14) {
                        /*
                         * Possible?
                         */
                        log_message(LOG_WARNING, "%s: sense result too"
                                  " small %d bytes\n",
                                  scsi_dev->name, s);
                        return -1;
                  }
                  asc = sense_buffer[12];
                  ascq = sense_buffer[13];
            } else if ((code == 0x2) || (code == 0x3)) {
                  descriptor_format = 1;
                  sense_key = sense_buffer[1] & 0xf;
                  asc = sense_buffer[2];
                  ascq = sense_buffer[3];
            } else {
                  log_message(LOG_WARNING,
                            "%s: invalid sense code 0x%x\n",
                            scsi_dev->name, code);
                  return -1;
            }
            log_message(LOG_WARNING,
                      "%s: sense key 0x%x ASC 0x%x ASCQ 0x%x\n",
                      scsi_dev->name, sense_key, asc, ascq);
      } else {
            if (sb_len < 4) {
                  log_message(LOG_WARNING,
                            "%s: sense buffer too small %d bytes, %d bytes too short\n",
                            scsi_dev->name, sb_len, 4 - sb_len);
                  return -1;
            }

            if (sense_buffer[0] < 15)
                  log_message(LOG_WARNING, "%s: old sense key: 0x%x\n",
                            scsi_dev->name, sense_buffer[0] & 0x0f);
            else
                  log_message(LOG_WARNING, "%s: sense = %2x %2x\n",
                            scsi_dev->name,  sense_buffer[0],
                            sense_buffer[2]);
            log_message(LOG_WARNING,
                      "%s: non-extended sense class %d code 0x%0x\n",
                      scsi_dev->name, sense_class, code);

      }

#ifdef DUMP_SENSE
      for (i = 0, j = 0; (i < s) && (j < 254); i++) {
            dprintf("i %d, j %d\n", i, j);
            out_buffer[j++] = hex_str[(sense_buffer[i] & 0xf0) >> 4];
            out_buffer[j++] = hex_str[sense_buffer[i] & 0x0f];
            out_buffer[j++] = ' ';
      }
      out_buffer[j] = '\0';
      log_message(LOG_WARNING, "%s: sense dump:\n", scsi_dev->name);
      log_message(LOG_WARNING, "%s: %s\n", scsi_dev->name, out_buffer);

#endif
      return -1;
}

static int scsi_dump(struct sysfs_device *scsi_dev, struct sg_io_hdr *io)
{
      if (!io->status && !io->host_status && !io->msg_status &&
          !io->driver_status) {
            /*
             * Impossible, should not be called.
             */
            log_message(LOG_WARNING, "%s: called with no error\n",
                      __FUNCTION__);
            return -1;
      }

      log_message(LOG_WARNING, "%s: sg_io failed status 0x%x 0x%x 0x%x 0x%x\n",
                scsi_dev->name, io->driver_status, io->host_status,
                io->msg_status, io->status);
      if (io->status == SCSI_CHECK_CONDITION)
            return scsi_dump_sense(scsi_dev, io);
      else
            return -1;
}

static int scsi_inquiry(struct sysfs_device *scsi_dev, int fd, unsigned
                  char evpd, unsigned char page, unsigned char *buf,
                  unsigned int buflen)
{
      unsigned char inq_cmd[INQUIRY_CMDLEN] =
            { INQUIRY_CMD, evpd, page, 0, buflen, 0 };
      unsigned char sense[SENSE_BUFF_LEN];
      struct sg_io_hdr io_hdr;
      int retval;
      int retry = 3; /* rather random */

      if (buflen > SCSI_INQ_BUFF_LEN) {
            log_message(LOG_WARNING, "buflen %d too long\n", buflen);
            return -1;
      }

resend:
      dprintf("%s evpd %d, page 0x%x\n", scsi_dev->name, evpd, page);

      memset(&io_hdr, 0, sizeof(struct sg_io_hdr));
      io_hdr.interface_id = 'S';
      io_hdr.cmd_len = sizeof(inq_cmd);
      io_hdr.mx_sb_len = sizeof(sense);
      io_hdr.dxfer_direction = SG_DXFER_FROM_DEV;
      io_hdr.dxfer_len = buflen;
      io_hdr.dxferp = buf;
      io_hdr.cmdp = inq_cmd;
      io_hdr.sbp = sense;
      io_hdr.timeout = DEF_TIMEOUT;

      if (ioctl(fd, SG_IO, &io_hdr) < 0) {
            log_message(LOG_WARNING, "%s: ioctl failed: %s\n",
                      scsi_dev->name, strerror(errno));
            retval = -1;
            goto error;
      }

      retval = sg_err_category3(&io_hdr);

      switch (retval) {
            case SG_ERR_CAT_CLEAN:
            case SG_ERR_CAT_RECOVERED:
                  retval = 0;
                  break;

            default:
                  retval = scsi_dump(scsi_dev, &io_hdr);
      }

      if (!retval) {
            retval = buflen;
      } else if (retval > 0) {
            if (--retry > 0) {
                  dprintf("%s: Retrying ...\n", scsi_dev->name);
                  goto resend;
            }
            retval = -1;
      }

error:
      if (retval < 0)
            log_message(LOG_WARNING,
                      "%s: Unable to get INQUIRY vpd %d page 0x%x.\n",
                      scsi_dev->name, evpd, page);

      return retval;
}

/* Get list of supported EVPD pages */
static int do_scsi_page0_inquiry(struct sysfs_device *scsi_dev, int fd,
                         char *buffer, int len)
{
      int retval;
      struct sysfs_attribute *vendor;

      memset(buffer, 0, len);
      retval = scsi_inquiry(scsi_dev, fd, 1, 0x0, buffer, len);
      if (retval < 0)
            return 1;

      if (buffer[1] != 0) {
            log_message(LOG_WARNING, "%s: page 0 not available.\n",
                      scsi_dev->name);
            return 1;
      }
      if (buffer[3] > len) {
            log_message(LOG_WARNING, "%s: page 0 buffer too long %d\n",
                     scsi_dev->name,  buffer[3]);
            return 1;
      }

      /*
       * Following check is based on code once included in the 2.5.x
       * kernel.
       *
       * Some ill behaved devices return the standard inquiry here
       * rather than the evpd data, snoop the data to verify.
       */
      if (buffer[3] > MODEL_LENGTH) {
            /*
             * If the vendor id appears in the page assume the page is
             * invalid.
             */
            vendor = sysfs_get_device_attr(scsi_dev, "vendor");
            if (!vendor) {
                  log_message(LOG_WARNING,
                            "%s: cannot get model attribute\n",
                            scsi_dev->name);
                  return 1;
            }
            if (!strncmp(&buffer[VENDOR_LENGTH], vendor->value,
                       VENDOR_LENGTH)) {
                  log_message(LOG_WARNING, "%s: invalid page0 data\n",
                            scsi_dev->name);
                  return 1;
            }
      }
      return 0;
}

/*
 * The caller checks that serial is long enough to include the vendor +
 * model.
 */
static int prepend_vendor_model(struct sysfs_device *scsi_dev, char *serial)
{
      struct sysfs_attribute *attr;
      int ind;

      attr = sysfs_get_device_attr(scsi_dev, "vendor");
      if (!attr) {
            log_message(LOG_WARNING, "%s: cannot get vendor attribute\n",
                      scsi_dev->name);
            return 1;
      }
      strncpy(serial, attr->value, VENDOR_LENGTH);
      ind = strlen(serial) - 1;
      /*
       * Remove sysfs added newlines.
       */
      if (serial[ind] == '\n')
            serial[ind] = '\0';

      attr = sysfs_get_device_attr(scsi_dev, "model");
      if (!attr) {
            log_message(LOG_WARNING, "%s: cannot get model attribute\n",
                      scsi_dev->name);
            return 1;
      }
      strncat(serial, attr->value, MODEL_LENGTH);
      ind = strlen(serial) - 1;
      if (serial[ind] == '\n')
            serial[ind] = '\0';
      else
            ind++;

      /*
       * This is not a complete check, since we are using strncat/cpy
       * above, ind will never be too large.
       */
      if (ind != (VENDOR_LENGTH + MODEL_LENGTH)) {
            log_message(LOG_WARNING, "%s: expected length %d, got length %d\n",
                      scsi_dev->name, (VENDOR_LENGTH + MODEL_LENGTH),
                      ind);
            return 1;
      }
      return ind;
}

/**
 * check_fill_0x83_id - check the page 0x83 id, if OK allocate and fill
 * serial number.
 **/
static int check_fill_0x83_id(struct sysfs_device *scsi_dev, char
                        *page_83, const struct scsi_id_search_values
                        *id_search, char *serial, int max_len)
{
      int i, j, len;

      /*
       * ASSOCIATION must be with the device (value 0)
       */
      if ((page_83[1] & 0x30) != 0)
            return 1;

      if ((page_83[1] & 0x0f) != id_search->id_type)
            return 1;

      /*
       * Possibly check NAA sub-type.
       */
      if ((id_search->naa_type != SCSI_ID_NAA_DONT_CARE) &&
          (id_search->naa_type != (page_83[4] & 0xf0) >> 4))
            return 1;

      /*
       * Check for matching code set - ASCII or BINARY.
       */
      if ((page_83[0] & 0x0f) != id_search->code_set)
            return 1;

      /*
       * page_83[3]: identifier length
       */
      len = page_83[3];
      if ((page_83[0] & 0x0f) != SCSI_ID_ASCII)
            /*
             * If not ASCII, use two bytes for each binary value.
             */
            len *= 2;

            /*
       * Add one byte for the NUL termination, and one for the id_type.
       */
      len += 2;
      if (id_search->id_type == SCSI_ID_VENDOR_SPECIFIC)
            len += VENDOR_LENGTH + MODEL_LENGTH;

      if (max_len < len) {
            log_message(LOG_WARNING, "%s: length %d too short - need %d\n",
                      scsi_dev->name, max_len, len);
            return 1;
      }

      serial[0] = hex_str[id_search->id_type];

      /*
       * For SCSI_ID_VENDOR_SPECIFIC prepend the vendor and model before
       * the id since it is not unique across all vendors and models,
       * this differs from SCSI_ID_T10_VENDOR, where the vendor is
       * included in the identifier.
       */
      if (id_search->id_type == SCSI_ID_VENDOR_SPECIFIC)
            if (prepend_vendor_model(scsi_dev, &serial[1]) < 0) {
                  dprintf("prepend failed\n");
                  return 1;
            }

      i = 4; /* offset to the start of the identifier */
      j = strlen(serial);
      if ((page_83[0] & 0x0f) == SCSI_ID_ASCII) {
            /*
             * ASCII descriptor.
             */
            while (i < (4 + page_83[3]))
                  serial[j++] = page_83[i++];
      } else {
            /*
             * Binary descriptor, convert to ASCII, using two bytes of
             * ASCII for each byte in the page_83.
             */
            while (i < (4 + page_83[3])) {
                  serial[j++] = hex_str[(page_83[i] & 0xf0) >> 4];
                  serial[j++] = hex_str[page_83[i] & 0x0f];
                  i++;
            }
      }
      return 0;
}

/* Get device identification VPD page */
static int do_scsi_page83_inquiry(struct sysfs_device *scsi_dev, int fd,
                          char *serial, int len)
{
      int retval;
      unsigned int id_ind, j;
      unsigned char page_83[SCSI_INQ_BUFF_LEN];

      memset(page_83, 0, SCSI_INQ_BUFF_LEN);
      retval = scsi_inquiry(scsi_dev, fd, 1, 0x83, page_83,
                        SCSI_INQ_BUFF_LEN);
      if (retval < 0)
            return 1;

      if (page_83[1] != 0x83) {
            log_message(LOG_WARNING, "%s: Invalid page 0x83\n",
                      scsi_dev->name);
            return 1;
      }
      
      /*
       * XXX Some devices (IBM 3542) return all spaces for an identifier if
       * the LUN is not actually configured. This leads to identifers of
       * the form: "1            ".
       */

      /*
       * Search for a match in the prioritized id_search_list.
       */
      for (id_ind = 0;
           id_ind < sizeof(id_search_list)/sizeof(id_search_list[0]);
           id_ind++) {
            /*
             * Examine each descriptor returned. There is normally only
             * one or a small number of descriptors.
             */
            for (j = 4; j <= (unsigned int)page_83[3] + 3; j += page_83[j + 3] + 4) {
                  retval = check_fill_0x83_id(scsi_dev, &page_83[j],
                                        &id_search_list[id_ind],
                                        serial, len);
                  dprintf("%s id desc %d/%d/%d\n", scsi_dev->name,
                        id_search_list[id_ind].id_type,
                        id_search_list[id_ind].naa_type,
                        id_search_list[id_ind].code_set);
                  if (!retval) {
                        dprintf("   used\n");
                        return retval;
                  } else if (retval < 0) {
                        dprintf("   failed\n");
                        return retval;
                  } else {
                        dprintf("   not used\n");
                  }
            }
      }
      return 1;
}

/* Get unit serial number VPD page */
static int do_scsi_page80_inquiry(struct sysfs_device *scsi_dev, int fd,
                          char *serial, int max_len)
{
      int retval;
      int ser_ind;
      int i;
      int len;
      unsigned char buf[SCSI_INQ_BUFF_LEN];

      memset(buf, 0, SCSI_INQ_BUFF_LEN);
      retval = scsi_inquiry(scsi_dev, fd, 1, 0x80, buf, SCSI_INQ_BUFF_LEN);
      if (retval < 0)
            return retval;

      if (buf[1] != 0x80) {
            log_message(LOG_WARNING, "%s: Invalid page 0x80\n",
                      scsi_dev->name);
            return 1;
      }

      len = 1 + VENDOR_LENGTH + MODEL_LENGTH + buf[3];
      if (max_len < len) {
            log_message(LOG_WARNING, "%s: length %d too short - need %d\n",
                      scsi_dev->name, max_len, len);
            return 1;
      }
      /*
       * Prepend 'S' to avoid unlikely collision with page 0x83 vendor
       * specific type where we prepend '0' + vendor + model.
       */
      serial[0] = 'S';
      ser_ind = prepend_vendor_model(scsi_dev, &serial[1]);
      if (ser_ind < 0)
            return 1;
      len = buf[3];
      for (i = 4; i < len + 4; i++, ser_ind++)
            serial[ser_ind] = buf[i];
      return 0;
}

int scsi_get_serial (struct sysfs_device *scsi_dev, const char *devname,
                 int page_code, char *serial, int len)
{
      unsigned char page0[SCSI_INQ_BUFF_LEN];
      int fd;
      int ind;
      int retval;

      memset(serial, 0, len);
      dprintf("opening %s\n", devname);
      fd = open(devname, O_RDONLY | O_NONBLOCK);
      if (fd < 0) {
            log_message(LOG_WARNING, "%s: cannot open %s: %s\n",
                      scsi_dev->name, devname, strerror(errno));
            return 1;
      }

      if (page_code == 0x80) {
            if (do_scsi_page80_inquiry(scsi_dev, fd, serial, len)) {
                  retval = 1;
                  goto completed;
            } else  {
                  retval = 0;
                  goto completed;
            }
      } else if (page_code == 0x83) {
            if (do_scsi_page83_inquiry(scsi_dev, fd, serial, len)) {
                  retval = 1;
                  goto completed;
            } else  {
                  retval = 0;
                  goto completed;
            }
      } else if (page_code != 0x00) {
            log_message(LOG_WARNING, "%s: unsupported page code 0x%d\n",
                      scsi_dev->name, page_code);
            return 1;
      }

      /*
       * Get page 0, the page of the pages. By default, try from best to
       * worst of supported pages: 0x83 then 0x80.
       */
      if (do_scsi_page0_inquiry(scsi_dev, fd, page0, SCSI_INQ_BUFF_LEN)) {
            /*
             * Don't try anything else. Black list if a specific page
             * should be used for this vendor+model, or maybe have an
             * optional fall-back to page 0x80 or page 0x83.
             */
            retval = 1;
            goto completed;
      }

      dprintf("%s: Checking page0\n", scsi_dev->name);

      for (ind = 4; ind <= page0[3] + 3; ind++)
            if (page0[ind] == 0x83)
                  if (!do_scsi_page83_inquiry(scsi_dev, fd, serial,
                                        len)) {
                        /*
                         * Success
                         */
                        retval = 0;
                        goto completed;
                  }

      for (ind = 4; ind <= page0[3] + 3; ind++)
            if (page0[ind] == 0x80)
                  if (!do_scsi_page80_inquiry(scsi_dev, fd, serial,
                                        len)) {
                        /*
                         * Success
                         */
                        retval = 0;
                        goto completed;
                  }
      retval = 1;
completed:
      if (close(fd) < 0)
            log_message(LOG_WARNING, "%s: close failed: %s\n", 
                      scsi_dev->name, strerror(errno));
      return retval;
}

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