/*
* compose persistent device path
*
- * Copyright (C) 2009-2011 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2009-2011 Kay Sievers <kay@vrfy.org>
*
* Logic based on Hannes Reinecke's shell script.
*
const char *subsystem;
subsystem = udev_device_get_subsystem(parent);
- if (subsystem == NULL || strcmp(subsystem, subsys) != 0)
+ if (subsystem == NULL || !streq(subsystem, subsys))
break;
dev = parent;
parent = udev_device_get_parent(parent);
struct udev_device *targetdev;
struct udev_device *fcdev = NULL;
const char *port;
- char *lun = NULL;;
+ char *lun = NULL;
targetdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target");
if (targetdev == NULL)
if (sscanf(name, "%d:%d:%d:%d", &host, &bus, &target, &lun) != 4)
return NULL;
- /* rebase host offset to get the local relative number */
+ /*
+ * Rebase host offset to get the local relative number
+ *
+ * Note: This is by definition racy, unreliable and too simple.
+ * Please do not copy this model anywhere. It's just a left-over
+ * from the time we had no idea how things should look like in
+ * the end.
+ *
+ * Making assumptions about a global in-kernel counter and use
+ * that to calculate a local offset is a very broken concept. It
+ * can only work as long as things are in strict order.
+ *
+ * The kernel needs to export the instance/port number of a
+ * controller directly, without the need for rebase magic like
+ * this. Manual driver unbind/bind, parallel hotplug/unplug will
+ * get into the way of this "I hope it works" logic.
+ */
basenum = -1;
base = strdup(udev_device_get_syspath(hostdev));
if (base == NULL)
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;
const char *id;
devtype = udev_device_get_devtype(parent);
- if (devtype == NULL || strcmp(devtype, "scsi_device") != 0)
+ if (devtype == NULL || !streq(devtype, "scsi_device"))
return parent;
/* firewire */
goto out;
}
- /* lousy scsi sysfs does not have a "subsystem" for the transport */
+ /* scsi sysfs does not have a "subsystem" for the transport */
name = udev_device_get_syspath(parent);
if (strstr(name, "/rport-") != NULL) {
}
/*
- * We do not support the ATA transport class, it creates duplicated link
- * names as the fake SCSI host adapters are all separated, they are all
- * re-based as host == 0. ATA should just stop faking two duplicated
- * hierarchies for a single topology and leave the SCSI stuff alone;
- * until that happens, there are no by-path/ links for ATA devices behind
- * an ATA transport class.
+ * We do not support the ATA transport class, it uses global counters
+ * to name the ata devices which numbers spread across multiple
+ * controllers.
+ *
+ * The real link numbers are not exported. Also, possible chains of ports
+ * behind port multipliers cannot be composed that way.
+ *
+ * Until all that is solved at the kernel level, there are no by-path/
+ * links for ATA devices.
*/
if (strstr(name, "/ata") != NULL) {
parent = NULL;
goto out;
}
+ if (strstr(name, "/vmbus_") != NULL) {
+ parent = handle_scsi_hyperv(parent, path);
+ goto out;
+ }
+
parent = handle_scsi_default(parent, path);
out:
return parent;
devtype = udev_device_get_devtype(parent);
if (devtype == NULL)
return parent;
- if (strcmp(devtype, "usb_interface") != 0 && strcmp(devtype, "usb_device") != 0)
+ if (!streq(devtype, "usb_interface") && !streq(devtype, "usb_device"))
return parent;
str = udev_device_get_sysname(parent);
return parent;
}
+static struct udev_device *handle_bcma(struct udev_device *parent, char **path)
+{
+ const char *sysname;
+ unsigned int core;
+
+ sysname = udev_device_get_sysname(parent);
+ if (sscanf(sysname, "bcma%*u:%u", &core) != 1)
+ return NULL;
+
+ path_prepend(path, "bcma-%u", core);
+ return parent;
+}
+
static struct udev_device *handle_ccw(struct udev_device *parent, struct udev_device *dev, char **path)
{
struct udev_device *scsi_dev;
subsys = udev_device_get_subsystem(parent);
if (subsys == NULL) {
;
- } else if (strcmp(subsys, "scsi_tape") == 0) {
+ } else if (streq(subsys, "scsi_tape")) {
handle_scsi_tape(parent, &path);
- } else if (strcmp(subsys, "scsi") == 0) {
+ } else if (streq(subsys, "scsi")) {
parent = handle_scsi(parent, &path);
some_transport = true;
- } else if (strcmp(subsys, "cciss") == 0) {
+ } else if (streq(subsys, "cciss")) {
parent = handle_cciss(parent, &path);
some_transport = true;
- } else if (strcmp(subsys, "usb") == 0) {
+ } else if (streq(subsys, "usb")) {
parent = handle_usb(parent, &path);
some_transport = true;
- } else if (strcmp(subsys, "serio") == 0) {
+ } else if (streq(subsys, "bcma")) {
+ parent = handle_bcma(parent, &path);
+ some_transport = true;
+ } else if (streq(subsys, "serio")) {
path_prepend(&path, "serio-%s", udev_device_get_sysnum(parent));
parent = skip_subsystem(parent, "serio");
- } else if (strcmp(subsys, "pci") == 0) {
+ } else if (streq(subsys, "pci")) {
path_prepend(&path, "pci-%s", udev_device_get_sysname(parent));
parent = skip_subsystem(parent, "pci");
- } else if (strcmp(subsys, "platform") == 0) {
+ } else if (streq(subsys, "platform")) {
path_prepend(&path, "platform-%s", udev_device_get_sysname(parent));
parent = skip_subsystem(parent, "platform");
some_transport = true;
- } else if (strcmp(subsys, "acpi") == 0) {
+ } else if (streq(subsys, "acpi")) {
path_prepend(&path, "acpi-%s", udev_device_get_sysname(parent));
parent = skip_subsystem(parent, "acpi");
- } else if (strcmp(subsys, "xen") == 0) {
+ } else if (streq(subsys, "xen")) {
path_prepend(&path, "xen-%s", udev_device_get_sysname(parent));
parent = skip_subsystem(parent, "xen");
- } else if (strcmp(subsys, "virtio") == 0) {
+ } else if (streq(subsys, "virtio")) {
path_prepend(&path, "virtio-pci-%s", udev_device_get_sysname(parent));
parent = skip_subsystem(parent, "virtio");
+ } else if (streq(subsys, "scm")) {
+ path_prepend(&path, "scm-%s", udev_device_get_sysname(parent));
+ parent = skip_subsystem(parent, "scm");
+ some_transport = true;
}
parent = udev_device_get_parent(parent);