shaba/systemd-stable
1
1
Fork 0
mirror of https://github.com/systemd/systemd-stable.git synced 2024-11-01 00:51:08 +03:00
Code
face198a5f
systemd-stable/extras/scsi_id/scsi_serial.c
patmans@us.ibm.com 4e05e4238b [PATCH] update scsi_id to work with libsysfs changes 
Update scsi_id to work with the libsysfs changes in udev: use
sysfs_get_classdev_attr and sysfs_get_device_attr in place of
sysfs_read_attribute_value.
2005-04-26 23:39:48 -07:00

736 lines
19 KiB
C
Raw Blame History

/*
* 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;
}
View Git Blame Copy Permalink