90 lines
2.5 KiB
Diff
90 lines
2.5 KiB
Diff
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Benjamin Marzinski <bmarzins@redhat.com>
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Date: Tue, 19 May 2020 15:55:15 -0500
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Subject: [PATCH] libmultipath: add uid failback for dasd devices
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Add failback code to get the uid for dasd devices from sysfs. Copied
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from dasdinfo
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Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
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---
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libmultipath/defaults.h | 1 +
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libmultipath/discovery.c | 37 ++++++++++++++++++++++++++++++++++++-
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2 files changed, 37 insertions(+), 1 deletion(-)
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diff --git a/libmultipath/defaults.h b/libmultipath/defaults.h
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index 984d8dd8..6a678a83 100644
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--- a/libmultipath/defaults.h
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+++ b/libmultipath/defaults.h
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@@ -8,6 +8,7 @@
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*/
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#define DEFAULT_UID_ATTRIBUTE "ID_SERIAL"
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#define DEFAULT_NVME_UID_ATTRIBUTE "ID_WWN"
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+#define DEFAULT_DASD_UID_ATTRIBUTE "ID_UID"
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#define DEFAULT_UDEVDIR "/dev"
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#define DEFAULT_MULTIPATHDIR "/" LIB_STRING "/multipath"
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#define DEFAULT_SELECTOR "service-time 0"
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diff --git a/libmultipath/discovery.c b/libmultipath/discovery.c
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index aa5942c3..002d3d18 100644
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--- a/libmultipath/discovery.c
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+++ b/libmultipath/discovery.c
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@@ -1920,12 +1920,44 @@ get_vpd_uid(struct path * pp)
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return get_vpd_sysfs(parent, 0x83, pp->wwid, WWID_SIZE);
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}
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+/* based on code from s390-tools/dasdinfo/dasdinfo.c */
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+static ssize_t dasd_get_uid(struct path *pp)
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+{
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+ struct udev_device *parent;
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+ char value[80];
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+ char *p;
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+ int i;
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+
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+ parent = udev_device_get_parent_with_subsystem_devtype(pp->udev, "ccw",
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+ NULL);
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+ if (!parent)
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+ return -1;
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+
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+ if (sysfs_attr_get_value(parent, "uid", value, 80) < 0)
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+ return -1;
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+
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+ p = value - 1;
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+ /* look for the 4th '.' and cut there */
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+ for (i = 0; i < 4; i++) {
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+ p = index(p + 1, '.');
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+ if (!p)
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+ break;
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+ }
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+ if (p)
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+ *p = '\0';
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+
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+ return strlcpy(pp->wwid, value, WWID_SIZE);
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+}
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+
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static ssize_t uid_fallback(struct path *pp, int path_state,
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const char **origin)
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{
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ssize_t len = -1;
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- if (pp->bus == SYSFS_BUS_SCSI) {
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+ if (pp->bus == SYSFS_BUS_CCW) {
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+ len = dasd_get_uid(pp);
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+ *origin = "sysfs";
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+ } else if (pp->bus == SYSFS_BUS_SCSI) {
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len = get_vpd_uid(pp);
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*origin = "sysfs";
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if (len < 0 && path_state == PATH_UP) {
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@@ -1970,6 +2002,9 @@ static bool has_uid_fallback(struct path *pp)
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!strcmp(pp->uid_attribute, ""))) ||
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(pp->bus == SYSFS_BUS_NVME &&
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(!strcmp(pp->uid_attribute, DEFAULT_NVME_UID_ATTRIBUTE) ||
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+ !strcmp(pp->uid_attribute, ""))) ||
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+ (pp->bus == SYSFS_BUS_CCW &&
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+ (!strcmp(pp->uid_attribute, DEFAULT_DASD_UID_ATTRIBUTE) ||
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!strcmp(pp->uid_attribute, ""))));
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}
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--
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2.17.2
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