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Blame SOURCES/0461-udev-path_id-improve-and-enhance-bus-detection-for-L.patch

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From b9146e4dab45e2f76ceca3772564c0f01e227a9f Mon Sep 17 00:00:00 2001
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From: Liu Yuan Yuan <bjyyliu@linux.vnet.ibm.com>
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Date: Fri, 13 Nov 2015 11:50:42 +0100
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Subject: [PATCH] udev/path_id: improve and enhance bus detection for Linux on
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 z Systems
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Improve and enhance the path_id udev builtin to correctly handle bus'
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available on Linux on z Systems (s390).
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Previously, the CCW bus and, in particular, any FCP devices on it, have
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been treated separately.  This commit integrates the CCW bus into the
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device chain loop.  FCP devices and their associated SCSI disks are now
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handled through the common SCSI handling functions in path_id.
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This implies also a change in the naming of the symbolic links created
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by udev.  So any backports of this commit to existing Linux distribution
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must be done with care.  If a backport is required, a udev rule must be
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created to also create the "old-style" symbolic links.
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Apart from the CCW bus, this commit adds bus support for the:
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- ccwgroup bus which manages network devices, and
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- ap bus which manages cryptographic adapters
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- iucv bus which manages IUCV devices on z/VM
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Cherry-picked from: e7eb5a8d88367a755944fdda3023a308e5272953
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Resolves: #1274401
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---
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 rules/40-redhat.rules           | 25 +++++++++++++
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 src/udev/udev-builtin-path_id.c | 63 ++++++++++++++++++---------------
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 2 files changed, 60 insertions(+), 28 deletions(-)
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diff --git a/rules/40-redhat.rules b/rules/40-redhat.rules
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index 0164dc921..c928d412b 100644
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--- a/rules/40-redhat.rules
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+++ b/rules/40-redhat.rules
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@@ -15,3 +15,28 @@ SUBSYSTEM=="scsi", ENV{DEVTYPE}=="scsi_target", TEST!="[module/sg]", RUN+="/sbin
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 # Rule for prandom character device node permissions
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 KERNEL=="prandom", MODE="0644"
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+
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+
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+# Rules for creating the ID_PATH for SCSI devices based on the CCW bus
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+# using the form: ccw-<BUS_ID>-zfcp-<WWPN>:<LUN>
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+#
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+ACTION=="remove", GOTO="zfcp_scsi_device_end"
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+
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+#
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+# Set environment variable "ID_ZFCP_BUS" to "1" if the devices
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+# (both disk and partition) are SCSI devices based on FCP devices
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+#
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+KERNEL=="sd*", SUBSYSTEMS=="ccw", DRIVERS=="zfcp", ENV{.ID_ZFCP_BUS}="1"
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+
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+# For SCSI disks
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+KERNEL=="sd*[!0-9]", SUBSYSTEMS=="scsi",
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+        ENV{.ID_ZFCP_BUS}=="1", ENV{DEVTYPE}=="disk",
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+        SYMLINK+="disk/by-path/ccw-$attr{hba_id}-zfcp-$attr{wwpn}:$attr{fcp_lun}"
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+
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+
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+# For partitions on a SCSI disk
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+KERNEL=="sd*[0-9]", SUBSYSTEMS=="scsi",
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+        ENV{.ID_ZFCP_BUS}=="1", ENV{DEVTYPE}=="partition",
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+        SYMLINK+="disk/by-path/ccw-$attr{hba_id}-zfcp-$attr{wwpn}:$attr{fcp_lun}-part%n"
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+
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+LABEL="zfcp_scsi_device_end"
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diff --git a/src/udev/udev-builtin-path_id.c b/src/udev/udev-builtin-path_id.c
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index 88a812ff5..19447201b 100644
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--- a/src/udev/udev-builtin-path_id.c
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+++ b/src/udev/udev-builtin-path_id.c
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@@ -615,27 +615,23 @@ static struct udev_device *handle_bcma(struct udev_device *parent, char **path)
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         return parent;
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 }
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-static struct udev_device *handle_ccw(struct udev_device *parent, struct udev_device *dev, char **path) {
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-        struct udev_device *scsi_dev;
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-
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-        scsi_dev = udev_device_get_parent_with_subsystem_devtype(dev, "scsi", "scsi_device");
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-        if (scsi_dev != NULL) {
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-                const char *wwpn;
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-                const char *lun;
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-                const char *hba_id;
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-
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-                hba_id = udev_device_get_sysattr_value(scsi_dev, "hba_id");
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-                wwpn = udev_device_get_sysattr_value(scsi_dev, "wwpn");
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-                lun = udev_device_get_sysattr_value(scsi_dev, "fcp_lun");
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-                if (hba_id != NULL && lun != NULL && wwpn != NULL) {
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-                        path_prepend(path, "ccw-%s-zfcp-%s:%s", hba_id, wwpn, lun);
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-                        goto out;
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-                }
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-        }
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+/* Handle devices of AP bus in System z platform. */
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+static struct udev_device *handle_ap(struct udev_device *parent, char **path) {
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+        const char *type, *func;
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+
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+        assert(parent);
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+        assert(path);
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+
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+        type = udev_device_get_sysattr_value(parent, "type");
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+        func = udev_device_get_sysattr_value(parent, "ap_functions");
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-        path_prepend(path, "ccw-%s", udev_device_get_sysname(parent));
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+        if (type != NULL && func != NULL) {
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+                path_prepend(path, "ap-%s-%s", type, func);
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+                goto out;
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+        }
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+        path_prepend(path, "ap-%s", udev_device_get_sysname(parent));
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 out:
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-        parent = skip_subsystem(parent, "ccw");
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+        parent = skip_subsystem(parent, "ap");
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         return parent;
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 }
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@@ -647,15 +643,8 @@ static int builtin_path_id(struct udev_device *dev, int argc, char *argv[], bool
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         bool new_sas_path = false;
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         bool enable_new_sas_path = true;
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-        /* S390 ccw bus */
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-        parent = udev_device_get_parent_with_subsystem_devtype(dev, "ccw", NULL);
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-        if (parent != NULL) {
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-                handle_ccw(parent, dev, &path);
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-                goto out;
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-        }
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-
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 restart:
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-        ;
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+
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         /* walk up the chain of devices and compose path */
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         parent = dev;
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         while (parent != NULL) {
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@@ -718,6 +707,25 @@ restart:
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                                 supported_parent = true;
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                                 supported_transport = true;
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                         }
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+                } else if (streq(subsys, "ccw")) {
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+                        path_prepend(&path, "ccw-%s", udev_device_get_sysname(parent));
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+                        parent = skip_subsystem(parent, "ccw");
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+                        supported_transport = true;
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+                        supported_parent = true;
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+                } else if (streq(subsys, "ccwgroup")) {
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+                        path_prepend(&path, "ccwgroup-%s", udev_device_get_sysname(parent));
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+                        parent = skip_subsystem(parent, "ccwgroup");
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+                        supported_transport = true;
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+                        supported_parent = true;
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+                } else if (streq(subsys, "ap")) {
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+                        parent = handle_ap(parent, &path);
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+                        supported_transport = true;
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+                        supported_parent = true;
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+                } else if (streq(subsys, "iucv")) {
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+                        path_prepend(&path, "iucv-%s", udev_device_get_sysname(parent));
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+                        parent = skip_subsystem(parent, "iucv");
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+                        supported_transport = true;
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+                        supported_parent = true;
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                 }
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                 parent = udev_device_get_parent(parent);
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@@ -743,7 +751,6 @@ restart:
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                 path = NULL;
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         }
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-out:
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         if (path != NULL) {
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                 char tag[UTIL_NAME_SIZE];
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                 size_t i;