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From 41480c7a787cc776e64d2ab7b737c3e8d6a84bd2 Mon Sep 17 00:00:00 2001
Message-Id: <41480c7a787cc776e64d2ab7b737c3e8d6a84bd2@dist-git>
From: Michal Privoznik <mprivozn@redhat.com>
Date: Fri, 6 Mar 2020 15:51:45 +0100
Subject: [PATCH] RHEL: virscsi: Support TAPEs in virSCSIDeviceGetDevName()
If the SCSI device we want to get /dev node name for is TAPE
device we need to look at 'tape' symlink in the sysfs dir
corresponding to the device.
https://bugzilla.redhat.com/show_bug.cgi?id=1808388
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Message-Id: <20200306145149.1610286-3-abologna@redhat.com>
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
---
src/util/virscsi.c | 37 ++++++++++++++++++++
tests/virscsidata/2-0-0-0/model | 1 +
tests/virscsidata/2-0-0-0/scsi_tape/st0/dev | 1 +
tests/virscsidata/2-0-0-0/sg3/dev | 1 +
tests/virscsidata/2-0-0-0/tape | 1 +
tests/virscsidata/2-0-0-0/type | 1 +
tests/virscsidata/2-0-0-0/vendor | 1 +
tests/virscsidata/sg3 | 0
tests/virscsitest.c | 38 ++++++++++++++++++---
9 files changed, 76 insertions(+), 5 deletions(-)
create mode 100644 tests/virscsidata/2-0-0-0/model
create mode 100644 tests/virscsidata/2-0-0-0/scsi_tape/st0/dev
create mode 100644 tests/virscsidata/2-0-0-0/sg3/dev
create mode 120000 tests/virscsidata/2-0-0-0/tape
create mode 100644 tests/virscsidata/2-0-0-0/type
create mode 100644 tests/virscsidata/2-0-0-0/vendor
create mode 100644 tests/virscsidata/sg3
diff --git a/src/util/virscsi.c b/src/util/virscsi.c
index af908107d9..6c3fd8a562 100644
--- a/src/util/virscsi.c
+++ b/src/util/virscsi.c
@@ -42,6 +42,7 @@
#include "virutil.h"
#include "virstring.h"
#include "virerror.h"
+#include "dirname.h"
#define SYSFS_SCSI_DEVICES "/sys/bus/scsi/devices"
@@ -249,6 +250,39 @@ virSCSIDeviceGetDevNameBlock(const char *prefix,
}
+static char *
+virSCSIDeviceGetDevNameTape(const char *prefix,
+ unsigned int adapter,
+ unsigned int bus,
+ unsigned int target,
+ unsigned long long unit)
+{
+ char *path = NULL;
+ char *resolvedPath = NULL;
+ char *name = NULL;
+
+ if (virAsprintf(&path,
+ "%s/%d:%u:%u:%llu/tape",
+ prefix, adapter, bus, target, unit) < 0)
+ return NULL;
+
+ if (virFileReadLink(path, &resolvedPath) < 0) {
+ virReportSystemError(errno,
+ _("Unable to read link: %s"),
+ path);
+ goto cleanup;
+ }
+
+ if (VIR_STRDUP(name, last_component(resolvedPath)) < 0)
+ goto cleanup;
+
+ cleanup:
+ VIR_FREE(resolvedPath);
+ VIR_FREE(path);
+ return name;
+}
+
+
/* Returns device name (e.g. "sdc") on success, or NULL
* on failure.
*/
@@ -277,6 +311,9 @@ virSCSIDeviceGetDevName(const char *sysfs_prefix,
break;
case VIR_SCSI_DEVICE_TYPE_TAPE:
+ name = virSCSIDeviceGetDevNameTape(prefix, adapter_id, bus, target, unit);
+ break;
+
case VIR_SCSI_DEVICE_TYPE_PRINTER:
case VIR_SCSI_DEVICE_TYPE_PROCESSOR:
case VIR_SCSI_DEVICE_TYPE_WORM:
diff --git a/tests/virscsidata/2-0-0-0/model b/tests/virscsidata/2-0-0-0/model
new file mode 100644
index 0000000000..d2ab4715c3
--- /dev/null
+++ b/tests/virscsidata/2-0-0-0/model
@@ -0,0 +1 @@
+scsi_debug
diff --git a/tests/virscsidata/2-0-0-0/scsi_tape/st0/dev b/tests/virscsidata/2-0-0-0/scsi_tape/st0/dev
new file mode 100644
index 0000000000..3dd777e840
--- /dev/null
+++ b/tests/virscsidata/2-0-0-0/scsi_tape/st0/dev
@@ -0,0 +1 @@
+9:0
diff --git a/tests/virscsidata/2-0-0-0/sg3/dev b/tests/virscsidata/2-0-0-0/sg3/dev
new file mode 100644
index 0000000000..b369a59b3e
--- /dev/null
+++ b/tests/virscsidata/2-0-0-0/sg3/dev
@@ -0,0 +1 @@
+21:3
diff --git a/tests/virscsidata/2-0-0-0/tape b/tests/virscsidata/2-0-0-0/tape
new file mode 120000
index 0000000000..6ca7f77539
--- /dev/null
+++ b/tests/virscsidata/2-0-0-0/tape
@@ -0,0 +1 @@
+scsi_tape/st0
\ No newline at end of file
diff --git a/tests/virscsidata/2-0-0-0/type b/tests/virscsidata/2-0-0-0/type
new file mode 100644
index 0000000000..d00491fd7e
--- /dev/null
+++ b/tests/virscsidata/2-0-0-0/type
@@ -0,0 +1 @@
+1
diff --git a/tests/virscsidata/2-0-0-0/vendor b/tests/virscsidata/2-0-0-0/vendor
new file mode 100644
index 0000000000..9b075671ea
--- /dev/null
+++ b/tests/virscsidata/2-0-0-0/vendor
@@ -0,0 +1 @@
+Linux
diff --git a/tests/virscsidata/sg3 b/tests/virscsidata/sg3
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/tests/virscsitest.c b/tests/virscsitest.c
index 1215adbfab..880fa22ca8 100644
--- a/tests/virscsitest.c
+++ b/tests/virscsitest.c
@@ -36,18 +36,34 @@ VIR_LOG_INIT("tests.scsitest");
static const char *abs_top_srcdir;
static char *virscsi_prefix;
+typedef struct {
+ const char *adapter;
+ unsigned int bus;
+ unsigned int target;
+ unsigned int unit;
+ const char *expectedName;
+} testGetDevNameData;
+
static int
-test1(const void *data ATTRIBUTE_UNUSED)
+testGetDevName(const void *opaque)
{
+ const testGetDevNameData *data = opaque;
char *name = NULL;
int ret = -1;
if (!(name = virSCSIDeviceGetDevName(virscsi_prefix,
- "scsi_host1", 0, 0, 0)))
+ data->adapter,
+ data->bus,
+ data->target,
+ data->unit)))
return -1;
- if (STRNEQ(name, "sdh"))
+ if (STRNEQ(name, data->expectedName)) {
+ fprintf(stderr,
+ "SCSI dev name mismatch, expected %s got %s",
+ data->expectedName, name);
goto cleanup;
+ }
ret = 0;
cleanup:
@@ -225,7 +241,9 @@ mymain(void)
CREATE_SYMLINK("0-0-0-0", "0:0:0:0");
CREATE_SYMLINK("1-0-0-0", "1:0:0:0");
+ CREATE_SYMLINK("2-0-0-0", "2:0:0:0");
CREATE_SYMLINK("sg0", "sg0");
+ CREATE_SYMLINK("sg3", "sg3");
CREATE_SYMLINK("sg8", "sg8");
VIR_FREE(virscsi_prefix);
@@ -235,8 +253,18 @@ mymain(void)
goto cleanup;
}
- if (virTestRun("test1", test1, NULL) < 0)
- ret = -1;
+#define TEST_GET_DEV_NAME(adapter, bus, target, unit, expectedName) \
+ do { \
+ testGetDevNameData data = {adapter, bus, target, unit, expectedName}; \
+ if (virTestRun("test getDevname " expectedName, \
+ testGetDevName, &data) < 0) \
+ ret = -1; \
+ } while (0)
+
+ TEST_GET_DEV_NAME("scsi_host0", 0, 0, 0, "sda");
+ TEST_GET_DEV_NAME("scsi_host1", 0, 0, 0, "sdh");
+ TEST_GET_DEV_NAME("scsi_host2", 0, 0, 0, "st0");
+
if (virTestRun("test2", test2, NULL) < 0)
ret = -1;
--
2.25.1
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