From: Benjamin Marzinski <bmarzins@redhat.com>
To: Christophe Varoqui <christophe.varoqui@opensvc.com>
Cc: device-mapper development <dm-devel@redhat.com>,
Martin Wilck <Martin.Wilck@suse.com>
Subject: [PATCH 2/3] libmultipath: add uid failback for dasd devices
Date: Tue, 15 Sep 2020 16:45:11 -0500 [thread overview]
Message-ID: <1600206312-6497-3-git-send-email-bmarzins@redhat.com> (raw)
In-Reply-To: <1600206312-6497-1-git-send-email-bmarzins@redhat.com>
Add failback code to get the uid for dasd devices from sysfs. Copied
from dasdinfo
Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
---
libmultipath/defaults.h | 1 +
libmultipath/discovery.c | 37 ++++++++++++++++++++++++++++++++++++-
2 files changed, 37 insertions(+), 1 deletion(-)
diff --git a/libmultipath/defaults.h b/libmultipath/defaults.h
index 39a5e415..947ba467 100644
--- a/libmultipath/defaults.h
+++ b/libmultipath/defaults.h
@@ -8,6 +8,7 @@
*/
#define DEFAULT_UID_ATTRIBUTE "ID_SERIAL"
#define DEFAULT_NVME_UID_ATTRIBUTE "ID_WWN"
+#define DEFAULT_DASD_UID_ATTRIBUTE "ID_UID"
#define DEFAULT_UDEVDIR "/dev"
#define DEFAULT_MULTIPATHDIR "/" LIB_STRING "/multipath"
#define DEFAULT_SELECTOR "service-time 0"
diff --git a/libmultipath/discovery.c b/libmultipath/discovery.c
index 3f1b1d71..2096fb48 100644
--- a/libmultipath/discovery.c
+++ b/libmultipath/discovery.c
@@ -1950,12 +1950,44 @@ get_vpd_uid(struct path * pp)
return get_vpd_sysfs(parent, 0x83, pp->wwid, WWID_SIZE);
}
+/* based on code from s390-tools/dasdinfo/dasdinfo.c */
+static ssize_t dasd_get_uid(struct path *pp)
+{
+ struct udev_device *parent;
+ char value[80];
+ char *p;
+ int i;
+
+ parent = udev_device_get_parent_with_subsystem_devtype(pp->udev, "ccw",
+ NULL);
+ if (!parent)
+ return -1;
+
+ if (sysfs_attr_get_value(parent, "uid", value, 80) < 0)
+ return -1;
+
+ p = value - 1;
+ /* look for the 4th '.' and cut there */
+ for (i = 0; i < 4; i++) {
+ p = index(p + 1, '.');
+ if (!p)
+ break;
+ }
+ if (p)
+ *p = '\0';
+
+ return strlcpy(pp->wwid, value, WWID_SIZE);
+}
+
static ssize_t uid_fallback(struct path *pp, int path_state,
const char **origin)
{
ssize_t len = -1;
- if (pp->bus == SYSFS_BUS_SCSI) {
+ if (pp->bus == SYSFS_BUS_CCW) {
+ len = dasd_get_uid(pp);
+ *origin = "sysfs";
+ } else if (pp->bus == SYSFS_BUS_SCSI) {
len = get_vpd_uid(pp);
*origin = "sysfs";
if (len < 0 && path_state == PATH_UP) {
@@ -2003,6 +2035,9 @@ static bool has_uid_fallback(struct path *pp)
!strcmp(pp->uid_attribute, ""))) ||
(pp->bus == SYSFS_BUS_NVME &&
(!strcmp(pp->uid_attribute, DEFAULT_NVME_UID_ATTRIBUTE) ||
+ !strcmp(pp->uid_attribute, ""))) ||
+ (pp->bus == SYSFS_BUS_CCW &&
+ (!strcmp(pp->uid_attribute, DEFAULT_DASD_UID_ATTRIBUTE) ||
!strcmp(pp->uid_attribute, ""))));
}
--
2.17.2
next prev parent reply other threads:[~2020-09-15 21:45 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-15 21:45 [PATCH 0/3] add library to check if device is a valid path Benjamin Marzinski
2020-09-15 21:45 ` [PATCH 1/3] multipath: add libmpathvalid library Benjamin Marzinski
2020-09-16 14:18 ` Martin Wilck
2020-09-17 23:52 ` Benjamin Marzinski
2020-09-18 7:51 ` Martin Wilck
2020-09-15 21:45 ` Benjamin Marzinski [this message]
2020-09-16 14:28 ` [PATCH 2/3] libmultipath: add uid failback for dasd devices Martin Wilck
2020-09-15 21:45 ` [PATCH 3/3] libmultipath: add ignore_udev_uid option Benjamin Marzinski
2020-09-16 14:46 ` Martin Wilck
2020-09-17 23:36 ` Benjamin Marzinski
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