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[libvirt] [PATCH 1/1] Fix bogus WWNs



---
 src/node_device.c           |   34 +++++++++++
 src/node_device_hal.h       |    4 +
 src/node_device_hal_linux.c |  134 +++++++++++++++++++++----------------------
 3 files changed, 104 insertions(+), 68 deletions(-)

diff --git a/src/node_device.c b/src/node_device.c
index 8de6495..cda14fa 100644
--- a/src/node_device.c
+++ b/src/node_device.c
@@ -33,6 +33,7 @@
 #include "memory.h"
 #include "logging.h"
 #include "node_device_conf.h"
+#include "node_device_hal.h"
 #include "node_device.h"
 #include "storage_backend.h" /* For virWaitForDevices */
 
@@ -49,6 +50,37 @@ static int dev_has_cap(const virNodeDeviceObjPtr dev, const char *cap)
     return 0;
 }
 
+
+static int update_caps(virNodeDeviceObjPtr dev)
+{
+    virNodeDevCapsDefPtr cap = dev->def->caps;
+
+    while (cap) {
+        /* The only cap that currently needs updating is the WWN of FC HBAs. */
+        if (cap->type == VIR_NODE_DEV_CAP_SCSI_HOST) {
+            if (cap->data.scsi_host.flags & VIR_NODE_DEV_CAP_FLAG_HBA_FC_HOST) {
+                if (read_wwn(cap->data.scsi_host.host,
+                            "port_name",
+                            &cap->data.scsi_host.wwpn) == -1) {
+                    VIR_ERROR(_("Failed to refresh WWPN for host%d"),
+                              cap->data.scsi_host.host);
+                }
+
+                if (read_wwn(cap->data.scsi_host.host,
+                            "node_name",
+                            &cap->data.scsi_host.wwnn) == -1) {
+                    VIR_ERROR(_("Failed to refresh WWNN for host%d"),
+                              cap->data.scsi_host.host);
+                }
+            }
+            cap = cap->next;
+        }
+    }
+
+    return 0;
+}
+
+
 #ifdef __linux__
 static int update_driver_name(virConnectPtr conn,
                               virNodeDeviceObjPtr dev)
@@ -253,6 +285,8 @@ static char *nodeDeviceDumpXML(virNodeDevicePtr dev,
     }
 
     update_driver_name(dev->conn, obj);
+    update_caps(obj);
+
     ret = virNodeDeviceDefFormat(dev->conn, obj->def);
 
 cleanup:
diff --git a/src/node_device_hal.h b/src/node_device_hal.h
index 0b4a2ef..c859fe3 100644
--- a/src/node_device_hal.h
+++ b/src/node_device_hal.h
@@ -30,10 +30,14 @@ int check_fc_host_linux(union _virNodeDevCapData *d);
 #define check_vport_capable(d) check_vport_capable_linux(d)
 int check_vport_capable_linux(union _virNodeDevCapData *d);
 
+#define read_wwn(host, file, wwn) read_wwn_linux(host, file, wwn)
+int read_wwn_linux(int host, const char *file, char **wwn);
+
 #else  /* __linux__ */
 
 #define check_fc_host(d)
 #define check_vport_capable(d)
+#define read_wwn(host, file, wwn)
 
 #endif /* __linux__ */
 
diff --git a/src/node_device_hal_linux.c b/src/node_device_hal_linux.c
index 2de9afe..96b2ecd 100644
--- a/src/node_device_hal_linux.c
+++ b/src/node_device_hal_linux.c
@@ -34,58 +34,53 @@
 
 #ifdef __linux__
 
-int check_fc_host_linux(union _virNodeDevCapData *d)
+static int open_wwn_file(const char *prefix,
+                         int host,
+                         const char *file,
+                         int *fd)
 {
-    char *sysfs_path = NULL;
-    char *wwnn_path = NULL;
-    char *wwpn_path = NULL;
-    char *p = NULL;
-    int fd = -1, retval = 0;
-    char buf[64];
-    struct stat st;
-
-    VIR_DEBUG(_("Checking if host%d is an FC HBA"), d->scsi_host.host);
+    int retval = 0;
+    char *wwn_path = NULL;
 
-    if (virAsprintf(&sysfs_path, "%s/host%d",
-                    LINUX_SYSFS_FC_HOST_PREFIX,
-                    d->scsi_host.host) < 0) {
+    if (virAsprintf(&wwn_path, "%s/host%d/%s", prefix, host, file) < 0) {
         virReportOOMError(NULL);
         retval = -1;
         goto out;
     }
 
-    if (stat(sysfs_path, &st) != 0) {
-        /* Not an FC HBA; not an error, either. */
-        goto out;
+    /* fd will be closed by caller */
+    if ((*fd = open(wwn_path, O_RDONLY)) != -1) {
+        VIR_ERROR(_("Opened WWN path '%s' for reading"),
+                  wwn_path);
+    } else {
+        VIR_ERROR(_("Failed to open WWN path '%s' for reading"),
+                  wwn_path);
     }
 
-    d->scsi_host.flags |= VIR_NODE_DEV_CAP_FLAG_HBA_FC_HOST;
+out:
+    VIR_FREE(wwn_path);
+    return retval;
+}
 
-    if (virAsprintf(&wwnn_path, "%s/node_name",
-                    sysfs_path) < 0) {
-        virReportOOMError(NULL);
-        retval = -1;
-        goto out;
-    }
 
-    if ((fd = open(wwnn_path, O_RDONLY)) < 0) {
-        retval = -1;
-        VIR_ERROR(_("Failed to open WWNN path '%s' for reading"),
-                  wwnn_path);
-        goto out;
+int read_wwn_linux(int host, const char *file, char **wwn)
+{
+    char *p = NULL;
+    int fd = -1, retval = 0;
+    char buf[64];
+
+    if (open_wwn_file(LINUX_SYSFS_FC_HOST_PREFIX, host, file, &fd) < 0) {
+            goto out;
     }
 
     memset(buf, 0, sizeof(buf));
     if (saferead(fd, buf, sizeof(buf)) < 0) {
         retval = -1;
-        VIR_ERROR(_("Failed to read WWNN from '%s'"),
-                  wwnn_path);
+        VIR_DEBUG(_("Failed to read WWN for host%d '%s'"),
+                  host, file);
         goto out;
     }
 
-    close(fd);
-    fd = -1;
-
     p = strstr(buf, "0x");
     if (p != NULL) {
         p += strlen("0x");
@@ -93,69 +88,72 @@ int check_fc_host_linux(union _virNodeDevCapData *d)
         p = buf;
     }
 
-    d->scsi_host.wwnn = strndup(p, sizeof(buf));
-    if (d->scsi_host.wwnn == NULL) {
+    *wwn = strndup(p, sizeof(buf));
+    if (*wwn == NULL) {
         virReportOOMError(NULL);
         retval = -1;
         goto out;
     }
 
-    p = strchr(d->scsi_host.wwnn, '\n');
+    p = strchr(*wwn, '\n');
     if (p != NULL) {
         *p = '\0';
     }
 
-    if (virAsprintf(&wwpn_path, "%s/port_name",
-                    sysfs_path) < 0) {
-        virReportOOMError(NULL);
-        retval = -1;
-        goto out;
+out:
+    if (fd != -1) {
+        close(fd);
     }
+    return retval;
+}
+
+
+int check_fc_host_linux(union _virNodeDevCapData *d)
+{
+    char *sysfs_path = NULL;
+    int retval = 0;
+    struct stat st;
 
-    if ((fd = open(wwpn_path, O_RDONLY)) < 0) {
+    VIR_DEBUG(_("Checking if host%d is an FC HBA"), d->scsi_host.host);
+
+    if (virAsprintf(&sysfs_path, "%s/host%d",
+                    LINUX_SYSFS_FC_HOST_PREFIX,
+                    d->scsi_host.host) < 0) {
+        virReportOOMError(NULL);
         retval = -1;
-        VIR_ERROR(_("Failed to open WWPN path '%s' for reading"),
-                  wwpn_path);
         goto out;
     }
 
-    memset(buf, 0, sizeof(buf));
-    if (saferead(fd, buf, sizeof(buf)) < 0) {
-        retval = -1;
-        VIR_ERROR(_("Failed to read WWPN from '%s'"),
-                  wwpn_path);
+    if (stat(sysfs_path, &st) != 0) {
+        /* Not an FC HBA; not an error, either. */
         goto out;
     }
 
-    close(fd);
-    fd = -1;
-
-    p = strstr(buf, "0x");
-    if (p != NULL) {
-        p += strlen("0x");
-    } else {
-        p = buf;
-    }
+    d->scsi_host.flags |= VIR_NODE_DEV_CAP_FLAG_HBA_FC_HOST;
 
-    d->scsi_host.wwpn = strndup(p, sizeof(buf));
-    if (d->scsi_host.wwpn == NULL) {
-        virReportOOMError(NULL);
+    if (read_wwn(d->scsi_host.host,
+                 "port_name",
+                 &d->scsi_host.wwpn) == -1) {
+        VIR_ERROR(_("Failed to read WWPN for host%d"),
+                  d->scsi_host.host);
         retval = -1;
         goto out;
     }
 
-    p = strchr(d->scsi_host.wwpn, '\n');
-    if (p != NULL) {
-        *p = '\0';
+    if (read_wwn(d->scsi_host.host,
+                 "node_name",
+                 &d->scsi_host.wwnn) == -1) {
+        VIR_ERROR(_("Failed to read WWNN for host%d"),
+                  d->scsi_host.host);
+        retval = -1;
     }
 
 out:
-    if (fd != -1) {
-        close(fd);
+    if (retval == -1) {
+        VIR_FREE(d->scsi_host.wwnn);
+        VIR_FREE(d->scsi_host.wwpn);
     }
     VIR_FREE(sysfs_path);
-    VIR_FREE(wwnn_path);
-    VIR_FREE(wwpn_path);
     return 0;
 }
 
-- 
1.6.0.6


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