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Handle scsi Hyper-V devices properly

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Hyper-V has an abstract bus, which gets renumbered on guest
startup. So instead of the bus numbers we should be using
the device GUIDs, which can be retrieved from the 'device_id'
sysfs attribute.

systemd commit a24d03b8ee2ca62cd1273e27cf4e79ddcc0fbb1c
Author: Hannes Reinecke <hare@suse.de>

Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
This commit is contained in:
Ian Stakenvicius 2013-01-25 12:20:48 -05:00 committed by Anthony G. Basile
parent e34b05dc4c
commit eb256defbe
1 changed files with 41 additions and 0 deletions
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41
src/udev/udev-builtin-path_id.c
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@ -302,6 +302,42 @@ out:
return hostdev;
}
static struct udev_device *handle_scsi_hyperv(struct udev_device *parent, char **path) {
struct udev_device *hostdev;
struct udev_device *vmbusdev;
const char *guid_str;
char *lun = NULL;
char guid[38];
size_t i, k;
hostdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host");
if (!hostdev)
return NULL;
vmbusdev = udev_device_get_parent(hostdev);
if (!vmbusdev)
return NULL;
guid_str = udev_device_get_sysattr_value(vmbusdev, "device_id");
if (!guid_str)
return NULL;
if (strlen(guid_str) < 37 || guid_str[0] != '{' || guid_str[36] != '}')
return NULL;
for (i = 1, k = 0; i < 36; i++) {
if (guid_str[i] == '-')
continue;
guid[k++] = guid_str[i];
}
guid[k] = '\0';
format_lun_number(parent, &lun);
path_prepend(path, "vmbus-%s-%s", guid, lun);
free(lun);
return parent;
}
static struct udev_device *handle_scsi(struct udev_device *parent, char **path)
{
const char *devtype;
@ -351,6 +387,11 @@ static struct udev_device *handle_scsi(struct udev_device *parent, char **path)
goto out;
}
if (strstr(name, "/vmbus_") != NULL) {
parent = handle_scsi_hyperv(parent, path);
goto out;
}
parent = handle_scsi_default(parent, path);
out:
return parent;