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4e9fdfccbd
Since the Unit Serial Number and the WWN are useful bits of
information export them as properties in the udev database. These
bits of information are often printed on the physical disk, see
http://people.freedesktop.org/~david/FUJITSU-MAY2036RC-sas-disk-picture.jpg
and displaying them separately in the UI (or in /dev/disk) might help
users identify the physical disk. This patch exports these bits of
information as ID_WWN and ID_SCSI_SERIAL.
Note that ata_id also use the ID_WWN property since commit
66094a4a7f (2009-11-04).
Also print out ID_SCSI=1 so users of the udev database knows the disk
speaks SCSI.
Here's the scsi_id output from one of my SAS disks with these changes:
ID_SCSI=1
ID_VENDOR=FUJITSU
ID_VENDOR_ENC=FUJITSU\x20
ID_MODEL=MAY2036RC
ID_MODEL_ENC=MAY2036RC\x20\x20\x20\x20\x20\x20\x20
ID_REVISION=0103
ID_TYPE=disk
ID_SERIAL=3500000e01b83f520
ID_SERIAL_SHORT=500000e01b83f520
ID_WWN=0x500000e01b83f520
ID_SCSI_SERIAL=B3G1P8500RWT
Unfortunately we can't overload ID_SERIAL for two reasons
1. ID_SERIAL (and ID_SERIAL_SHORT) exported by scsi_id isn't really
the unit serial number (as defined by SCSI) - it is sometimes the
WWN (since it is more unique than the Unit Serial Number) and
complex rules (to make the serial unique) govern what value to
use.
2. It would break existing setups if the value of ID_SERIAL changed
Signed-off-by: David Zeuthen <davidz@redhat.com>
64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
/*
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* scsi_id.h
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*
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* General defines and such for scsi_id
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*
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* Copyright (C) IBM Corp. 2003
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*/
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#define MAX_PATH_LEN 512
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/*
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* MAX_ATTR_LEN: maximum length of the result of reading a sysfs
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* attribute.
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*/
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#define MAX_ATTR_LEN 256
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/*
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* MAX_SERIAL_LEN: the maximum length of the serial number, including
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* added prefixes such as vendor and product (model) strings.
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*/
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#define MAX_SERIAL_LEN 256
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/*
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* MAX_BUFFER_LEN: maximum buffer size and line length used while reading
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* the config file.
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*/
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#define MAX_BUFFER_LEN 256
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struct scsi_id_device {
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char vendor[9];
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char model[17];
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char revision[5];
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char type[33];
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char kernel[64];
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char serial[MAX_SERIAL_LEN];
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char serial_short[MAX_SERIAL_LEN];
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int use_sg;
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/* Always from page 0x80 e.g. 'B3G1P8500RWT' - may not be unique */
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char unit_serial_number[MAX_SERIAL_LEN];
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/* NULs if not set - otherwise hex encoding using lower-case e.g. '50014ee0016eb572' */
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char wwn[17];
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};
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extern int scsi_std_inquiry(struct udev *udev, struct scsi_id_device *dev_scsi, const char *devname);
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extern int scsi_get_serial (struct udev *udev, struct scsi_id_device *dev_scsi, const char *devname,
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int page_code, int len);
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/*
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* Page code values.
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*/
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enum page_code {
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PAGE_83_PRE_SPC3 = -0x83,
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PAGE_UNSPECIFIED = 0x00,
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PAGE_80 = 0x80,
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PAGE_83 = 0x83,
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};
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