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Some SCSI devices use the same WWN and have a WWN extension that we
need to take into account when creating the /dev/disk/by-id/wwn
symlinks. Thus, introduce ID_WWN_WITH_EXTENSION. This property will
contain either the WWN (if no extension is present) or the WWN with
the vendor extension appended.
Example:
# /lib/udev/ata_id/ata_id --export /dev/sda |grep WWN
ID_WWN=0x5001517387d61905
ID_WWN_WITH_EXTENSION=0x5001517387d61905
# /lib/udev/scsi_id --whitelisted --export -d /dev/sdb |grep WWN
ID_WWN=0x600508b400105df7
ID_WWN_VENDOR_EXTENSION=0x0000e00000d80000
ID_WWN_WITH_EXTENSION=0x600508b400105df70000e00000d80000
# /lib/udev/scsi_id --whitelisted --export -d /dev/sdc |grep WWN
ID_WWN=0x600508b400105df7
ID_WWN_VENDOR_EXTENSION=0x0000e00000db0000
ID_WWN_WITH_EXTENSION=0x600508b400105df70000e00000db0000
Signed-off-by: David Zeuthen <davidz@redhat.com>
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>
Request specific parents identified by subsystem and don't rely on
a predefined sequence.
Also let the devpath be longer than 72 chars, tsss ...
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
We never used any of the libsysfs convenience features. Here we replace
it completely with 300 lines of code, which are much simpler and a bit
faster cause udev(d) does not open any syfs file for a simple event which
does not need any parent device information.
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
This patch is to enable the use of scsi_id to derive a UID for a SCSI-2
device which is not compliant with the page 83 inquiry reply format for
either SPC-2 or SPC-3. In this case, the page 83 reply does not
contain a list of Identification descriptors but a single binary encoded
hexa-decimal Vendor Specified Identifier.
The update is being driven by the need for scsi_id to support older
model EMC Symmetrix hardware, that is, models 4, 5, and 6.
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.
Scsi_id hasn't been changed to use the latest libsysfs changes. The
"directory" in the sysfs_class_device is now considered "private" and only
should be accessed using functions. Treating the structures as handles lets
us only load information when it's needed, reducing caching or stale
information and also helping performance.
Here's the problem.
static inline char *sysfs_get_attr(struct sysfs_class_device *dev,
const char *attr)
{
return sysfs_get_value_from_attributes(dev->directory->attributes,
attr);
}
Please try this quick fix:
