From 9c5daeb8c99ca12a66387de448f585742887fd75 Mon Sep 17 00:00:00 2001

Message-Id: <9c5daeb8c99ca12a66387de448f585742887fd75@dist-git>

From: Michal Privoznik <mprivozn@redhat.com>

Date: Fri, 6 Mar 2020 15:52:21 +0100

Subject: [PATCH] RHEL: virscsi: Check device type before getting it's /dev

 node name

Not all SCSI devices are block devices, therefore

/sys/bus/scsi/devices/X:X:X:X/block/ directory does not always

exist. Check if the SCSI device is a block device beforehand.

https://bugzilla.redhat.com/show_bug.cgi?id=1808390

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>

Signed-off-by: Andrea Bolognani <abologna@redhat.com>

Message-Id: <20200306145226.1610708-2-abologna@redhat.com>

Reviewed-by: Jiri Denemark <jdenemar@redhat.com>

---

 src/util/virscsi.c             | 140 ++++++++++++++++++++++++++++++---

 tests/virscsidata/0-0-0-0/type |   1 +

 tests/virscsidata/1-0-0-0/type |   1 +

 3 files changed, 131 insertions(+), 11 deletions(-)

 create mode 100644 tests/virscsidata/0-0-0-0/type

 create mode 100644 tests/virscsidata/1-0-0-0/type

diff --git a/src/util/virscsi.c b/src/util/virscsi.c

index 6a90d9002f..770f727cac 100644

--- a/src/util/virscsi.c

+++ b/src/util/virscsi.c

@@ -47,6 +47,32 @@ struct _virUsedByInfo {

 };

 typedef struct _virUsedByInfo virUsedByInfo;

+

+/* Keep in sync with scsi/scsi_proto.h */

+typedef enum {

+    VIR_SCSI_DEVICE_TYPE_NONE = -1,

+    VIR_SCSI_DEVICE_TYPE_DISK = 0x00,

+    VIR_SCSI_DEVICE_TYPE_TAPE = 0x01,

+    VIR_SCSI_DEVICE_TYPE_PRINTER = 0x02,

+    VIR_SCSI_DEVICE_TYPE_PROCESSOR = 0x03,

+    VIR_SCSI_DEVICE_TYPE_WORM = 0x04,

+    VIR_SCSI_DEVICE_TYPE_ROM = 0x05,

+    VIR_SCSI_DEVICE_TYPE_SCANNER = 0x06,

+    VIR_SCSI_DEVICE_TYPE_MOD = 0x07,

+    VIR_SCSI_DEVICE_TYPE_MEDIUM_CHANGER = 0x08,

+    VIR_SCSI_DEVICE_TYPE_COMM = 0x09,

+    VIR_SCSI_DEVICE_TYPE_RAID = 0x0c,

+    VIR_SCSI_DEVICE_TYPE_ENCLOSURE = 0x0d,

+    VIR_SCSI_DEVICE_TYPE_RBC = 0x0e,

+    VIR_SCSI_DEVICE_TYPE_OSD = 0x11,

+    VIR_SCSI_DEVICE_TYPE_ZBC = 0x14,

+    VIR_SCSI_DEVICE_TYPE_WLUN = 0x1e,

+    VIR_SCSI_DEVICE_TYPE_NO_LUN = 0x7f,

+

+    VIR_SCSI_DEVICE_TYPE_LAST,

+} virSCSIDeviceType;

+

+

 struct _virSCSIDevice {

     unsigned int adapter;

     unsigned int bus;

@@ -126,6 +152,78 @@ virSCSIDeviceGetSgName(const char *sysfs_prefix,

     return NULL;

 }

+

+static int

+virSCSIDeviceGetType(const char *prefix,

+                     unsigned int adapter,

+                     unsigned int bus,

+                     unsigned int target,

+                     unsigned long long unit,

+                     virSCSIDeviceType *type)

+{

+    int intType;

+

+    if (virFileReadValueInt(&intType,

+                            "%s/%d:%u:%u:%llu/type",

+                            prefix, adapter, bus, target, unit) < 0)

+        return -1;

+

+    switch (intType) {

+    case VIR_SCSI_DEVICE_TYPE_DISK:

+    case VIR_SCSI_DEVICE_TYPE_TAPE:

+    case VIR_SCSI_DEVICE_TYPE_PRINTER:

+    case VIR_SCSI_DEVICE_TYPE_PROCESSOR:

+    case VIR_SCSI_DEVICE_TYPE_WORM:

+    case VIR_SCSI_DEVICE_TYPE_ROM:

+    case VIR_SCSI_DEVICE_TYPE_SCANNER:

+    case VIR_SCSI_DEVICE_TYPE_MOD:

+    case VIR_SCSI_DEVICE_TYPE_MEDIUM_CHANGER:

+    case VIR_SCSI_DEVICE_TYPE_COMM:

+    case VIR_SCSI_DEVICE_TYPE_RAID:

+    case VIR_SCSI_DEVICE_TYPE_ENCLOSURE:

+    case VIR_SCSI_DEVICE_TYPE_RBC:

+    case VIR_SCSI_DEVICE_TYPE_OSD:

+    case VIR_SCSI_DEVICE_TYPE_ZBC:

+    case VIR_SCSI_DEVICE_TYPE_WLUN:

+    case VIR_SCSI_DEVICE_TYPE_NO_LUN:

+        *type = intType;

+        break;

+

+    default:

+        virReportError(VIR_ERR_INTERNAL_ERROR,

+                       _("unknown SCSI device type: %x"),

+                       intType);

+        return -1;

+    }

+

+    return 0;

+}

+

+

+static char *

+virSCSIDeviceGetDevNameBlock(const char *prefix,

+                             unsigned int adapter,

+                             unsigned int bus,

+                             unsigned int target,

+                             unsigned long long unit)

+{

+    g_autoptr(DIR) dir = NULL;

+    struct dirent *entry;

+    g_autofree char *path = NULL;

+

+    path = g_strdup_printf("%s/%d:%u:%u:%llu/block",

+                           prefix, adapter, bus, target, unit);

+

+    if (virDirOpen(&dir, path) < 0)

+        return NULL;

+

+    if (virDirRead(dir, &entry, path) > 0)

+        return g_strdup(entry->d_name);

+

+    return NULL;

+}

+

+

 /* Returns device name (e.g. "sdc") on success, or NULL

  * on failure.

  */

@@ -136,25 +234,45 @@ virSCSIDeviceGetDevName(const char *sysfs_prefix,

                         unsigned int target,

                         unsigned long long unit)

 {

-    g_autoptr(DIR) dir = NULL;

-    struct dirent *entry;

-    g_autofree char *path = NULL;

     unsigned int adapter_id;

+    virSCSIDeviceType type;

     const char *prefix = sysfs_prefix ? sysfs_prefix : SYSFS_SCSI_DEVICES;

     if (virSCSIDeviceGetAdapterId(adapter, &adapter_id) < 0)

         return NULL;

-    path = g_strdup_printf("%s/%d:%u:%u:%llu/block", prefix, adapter_id, bus,

-                           target, unit);

-

-    if (virDirOpen(&dir, path) < 0)

+    if (virSCSIDeviceGetType(prefix, adapter_id,

+                             bus, target, unit, &type) < 0)

         return NULL;

-    if (virDirRead(dir, &entry, path) > 0)

-        return g_strdup(entry->d_name);

-

-    return NULL;

+    switch (type) {

+    case VIR_SCSI_DEVICE_TYPE_DISK:

+        return virSCSIDeviceGetDevNameBlock(prefix, adapter_id, bus, target, unit);

+

+    case VIR_SCSI_DEVICE_TYPE_TAPE:

+    case VIR_SCSI_DEVICE_TYPE_PRINTER:

+    case VIR_SCSI_DEVICE_TYPE_PROCESSOR:

+    case VIR_SCSI_DEVICE_TYPE_WORM:

+    case VIR_SCSI_DEVICE_TYPE_ROM:

+    case VIR_SCSI_DEVICE_TYPE_SCANNER:

+    case VIR_SCSI_DEVICE_TYPE_MOD:

+    case VIR_SCSI_DEVICE_TYPE_MEDIUM_CHANGER:

+    case VIR_SCSI_DEVICE_TYPE_COMM:

+    case VIR_SCSI_DEVICE_TYPE_RAID:

+    case VIR_SCSI_DEVICE_TYPE_ENCLOSURE:

+    case VIR_SCSI_DEVICE_TYPE_RBC:

+    case VIR_SCSI_DEVICE_TYPE_OSD:

+    case VIR_SCSI_DEVICE_TYPE_ZBC:

+    case VIR_SCSI_DEVICE_TYPE_WLUN:

+    case VIR_SCSI_DEVICE_TYPE_NO_LUN:

+    case VIR_SCSI_DEVICE_TYPE_NONE:

+    case VIR_SCSI_DEVICE_TYPE_LAST:

+    default:

+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED,

+                       _("unsupported SCSI device type: %x"),

+                       type);

+        return NULL;

+    }

 }

 virSCSIDevice *

diff --git a/tests/virscsidata/0-0-0-0/type b/tests/virscsidata/0-0-0-0/type

new file mode 100644

index 0000000000..573541ac97

--- /dev/null

+++ b/tests/virscsidata/0-0-0-0/type

@@ -0,0 +1 @@

+0

diff --git a/tests/virscsidata/1-0-0-0/type b/tests/virscsidata/1-0-0-0/type

new file mode 100644

index 0000000000..573541ac97

--- /dev/null

+++ b/tests/virscsidata/1-0-0-0/type

@@ -0,0 +1 @@

+0

-- 

2.34.1