* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdarg.h>
-#include <unistd.h>
-#include <string.h>
#include <ctype.h>
-#include <fcntl.h>
-#include <errno.h>
#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
#include <getopt.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "string-util.h"
#include "udev.h"
_printf_(2,3)
static struct udev_device *skip_subsystem(struct udev_device *dev, const char *subsys) {
struct udev_device *parent = dev;
+ assert(dev);
+ assert(subsys);
+
while (parent != NULL) {
const char *subsystem;
const char *port;
char *lun = NULL;
+ assert(parent);
+ assert(path);
+
targetdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target");
if (targetdev == NULL)
return NULL;
format_lun_number(parent, &lun);
path_prepend(path, "fc-%s-%s", port, lun);
- if (lun)
- free(lun);
+ free(lun);
out:
udev_device_unref(fcdev);
return parent;
}
-static struct udev_device *handle_scsi_sas(struct udev_device *parent, char **path) {
+static struct udev_device *handle_scsi_sas_wide_port(struct udev_device *parent, char **path) {
struct udev *udev = udev_device_get_udev(parent);
struct udev_device *targetdev;
struct udev_device *target_parent;
const char *sas_address;
char *lun = NULL;
+ assert(parent);
+ assert(path);
+
targetdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target");
if (targetdev == NULL)
return NULL;
format_lun_number(parent, &lun);
path_prepend(path, "sas-%s-%s", sas_address, lun);
- if (lun)
- free(lun);
+ free(lun);
out:
udev_device_unref(sasdev);
return parent;
}
+static struct udev_device *handle_scsi_sas(struct udev_device *parent, char **path)
+{
+ struct udev *udev = udev_device_get_udev(parent);
+ struct udev_device *targetdev;
+ struct udev_device *target_parent;
+ struct udev_device *port;
+ struct udev_device *expander;
+ struct udev_device *target_sasdev = NULL;
+ struct udev_device *expander_sasdev = NULL;
+ struct udev_device *port_sasdev = NULL;
+ const char *sas_address = NULL;
+ const char *phy_id;
+ const char *phy_count;
+ char *lun = NULL;
+
+ assert(parent);
+ assert(path);
+
+ targetdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target");
+ if (targetdev == NULL)
+ return NULL;
+
+ target_parent = udev_device_get_parent(targetdev);
+ if (target_parent == NULL)
+ return NULL;
+
+ /* Get sas device */
+ target_sasdev = udev_device_new_from_subsystem_sysname(udev,
+ "sas_device", udev_device_get_sysname(target_parent));
+ if (target_sasdev == NULL)
+ return NULL;
+
+ /* The next parent is sas port */
+ port = udev_device_get_parent(target_parent);
+ if (port == NULL) {
+ parent = NULL;
+ goto out;
+ }
+
+ /* Get port device */
+ port_sasdev = udev_device_new_from_subsystem_sysname(udev,
+ "sas_port", udev_device_get_sysname(port));
+
+ phy_count = udev_device_get_sysattr_value(port_sasdev, "num_phys");
+ if (phy_count == NULL) {
+ parent = NULL;
+ goto out;
+ }
+
+ /* Check if we are simple disk */
+ if (strncmp(phy_count, "1", 2) != 0) {
+ parent = handle_scsi_sas_wide_port(parent, path);
+ goto out;
+ }
+
+ /* Get connected phy */
+ phy_id = udev_device_get_sysattr_value(target_sasdev, "phy_identifier");
+ if (phy_id == NULL) {
+ parent = NULL;
+ goto out;
+ }
+
+ /* The port's parent is either hba or expander */
+ expander = udev_device_get_parent(port);
+ if (expander == NULL) {
+ parent = NULL;
+ goto out;
+ }
+
+ /* Get expander device */
+ expander_sasdev = udev_device_new_from_subsystem_sysname(udev,
+ "sas_device", udev_device_get_sysname(expander));
+ if (expander_sasdev != NULL) {
+ /* Get expander's address */
+ sas_address = udev_device_get_sysattr_value(expander_sasdev,
+ "sas_address");
+ if (sas_address == NULL) {
+ parent = NULL;
+ goto out;
+ }
+ }
+
+ format_lun_number(parent, &lun);
+ if (sas_address)
+ path_prepend(path, "sas-exp%s-phy%s-%s", sas_address, phy_id, lun);
+ else
+ path_prepend(path, "sas-phy%s-%s", phy_id, lun);
+
+ free(lun);
+out:
+ udev_device_unref(target_sasdev);
+ udev_device_unref(expander_sasdev);
+ udev_device_unref(port_sasdev);
+ return parent;
+}
+
static struct udev_device *handle_scsi_iscsi(struct udev_device *parent, char **path) {
struct udev *udev = udev_device_get_udev(parent);
struct udev_device *transportdev;
const char *port;
char *lun = NULL;
+ assert(parent);
+ assert(path);
+
/* find iscsi session */
transportdev = parent;
for (;;) {
format_lun_number(parent, &lun);
path_prepend(path, "ip-%s:%s-iscsi-%s-%s", addr, port, target, lun);
- if (lun)
- free(lun);
+ free(lun);
out:
udev_device_unref(sessiondev);
udev_device_unref(conndev);
return parent;
}
+static struct udev_device *handle_scsi_ata(struct udev_device *parent, char **path) {
+ struct udev *udev = udev_device_get_udev(parent);
+ struct udev_device *targetdev;
+ struct udev_device *target_parent;
+ struct udev_device *atadev;
+ const char *port_no;
+
+ assert(parent);
+ assert(path);
+
+ targetdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host");
+ if (!targetdev)
+ return NULL;
+
+ target_parent = udev_device_get_parent(targetdev);
+ if (!target_parent)
+ return NULL;
+
+ atadev = udev_device_new_from_subsystem_sysname(udev, "ata_port", udev_device_get_sysname(target_parent));
+ if (!atadev)
+ return NULL;
+
+ port_no = udev_device_get_sysattr_value(atadev, "port_no");
+ if (!port_no) {
+ parent = NULL;
+ goto out;
+ }
+ path_prepend(path, "ata-%s", port_no);
+out:
+ udev_device_unref(atadev);
+ return parent;
+}
+
static struct udev_device *handle_scsi_default(struct udev_device *parent, char **path) {
struct udev_device *hostdev;
int host, bus, target, lun;
struct dirent *dent;
int basenum;
+ assert(parent);
+ assert(path);
+
hostdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host");
if (hostdev == NULL)
return NULL;
char guid[38];
size_t i, k;
+ assert(parent);
+ assert(path);
+
hostdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host");
if (!hostdev)
return NULL;
return parent;
}
-static struct udev_device *handle_scsi(struct udev_device *parent, char **path) {
+static struct udev_device *handle_scsi(struct udev_device *parent, char **path, bool *supported_parent) {
const char *devtype;
const char *name;
const char *id;
if (id != NULL) {
parent = skip_subsystem(parent, "scsi");
path_prepend(path, "ieee1394-0x%s", id);
+ *supported_parent = true;
goto out;
}
if (strstr(name, "/rport-") != NULL) {
parent = handle_scsi_fibre_channel(parent, path);
+ *supported_parent = true;
goto out;
}
if (strstr(name, "/end_device-") != NULL) {
parent = handle_scsi_sas(parent, path);
+ *supported_parent = true;
goto out;
}
if (strstr(name, "/session") != NULL) {
parent = handle_scsi_iscsi(parent, path);
+ *supported_parent = true;
goto out;
}
- /*
- * 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;
+ parent = handle_scsi_ata(parent, path);
goto out;
}
static struct udev_device *handle_ccw(struct udev_device *parent, struct udev_device *dev, char **path) {
struct udev_device *scsi_dev;
+ assert(parent);
+ assert(dev);
+ assert(path);
+
scsi_dev = udev_device_get_parent_with_subsystem_devtype(dev, "scsi", "scsi_device");
if (scsi_dev != NULL) {
const char *wwpn;
bool supported_transport = false;
bool supported_parent = false;
+ assert(dev);
+
/* S390 ccw bus */
parent = udev_device_get_parent_with_subsystem_devtype(dev, "ccw", NULL);
if (parent != NULL) {
} else if (streq(subsys, "scsi_tape")) {
handle_scsi_tape(parent, &path);
} else if (streq(subsys, "scsi")) {
- parent = handle_scsi(parent, &path);
+ parent = handle_scsi(parent, &path, &supported_parent);
supported_transport = true;
} else if (streq(subsys, "cciss")) {
parent = handle_cciss(parent, &path);
supported_parent = true;
}
- parent = udev_device_get_parent(parent);
+ if (parent)
+ parent = udev_device_get_parent(parent);
}
/*
- * Do return devices with have an unknown type of parent device, they
- * might produce conflicting IDs below multiple independent parent
- * devices.
+ * Do not return devices with an unknown parent device type. They
+ * might produce conflicting IDs if the parent does not provide a
+ * unique and predictable name.
*/
- if (!supported_parent) {
- free(path);
- path = NULL;
- }
+ if (!supported_parent)
+ path = mfree(path);
/*
- * Do not return a have-only a single-parent block devices, some
- * have entire hidden buses behind it, and not create predictable
- * IDs that way.
+ * Do not return block devices without a well-known transport. Some
+ * devices do not expose their buses and do not provide a unique
+ * and predictable name that way.
*/
- if (streq(udev_device_get_subsystem(dev), "block") && !supported_transport) {
- free(path);
- path = NULL;
- }
+ if (streq(udev_device_get_subsystem(dev), "block") && !supported_transport)
+ path = mfree(path);
out:
if (path != NULL) {
const struct udev_builtin udev_builtin_path_id = {
.name = "path_id",
.cmd = builtin_path_id,
- .help = "compose persistent device path",
+ .help = "Compose persistent device path",
.run_once = true,
};
projects / thirdparty / systemd.git / blobdiff