[Xen-devel] [PATCH 16 of 21 RESEND] blktap3/drivers: Introduces back-end storage type discovery

[Thanos Makatos <thanos.makatos@xxxxxxxxxx>]

This patch copies from blktap2.5 functionality that retrieves the type of
the back-end storage.

Signed-off-by: Thanos Makatos <thanos.makatos@xxxxxxxxxx>

diff --git a/tools/blktap3/drivers/tapdisk-storage.c 
b/tools/blktap3/drivers/tapdisk-storage.c
new file mode 100644
--- /dev/null
+++ b/tools/blktap3/drivers/tapdisk-storage.c
@@ -0,0 +1,112 @@
+/*
+ * Copyright (c) 2010, Citrix Systems, Inc.
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of XenSource Inc. nor the names of its contributors
+ *       may be used to endorse or promote products derived from this software
+ *       without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+ * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <errno.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/vfs.h>
+
+#include "tapdisk-storage.h"
+
+#ifndef NFS_SUPER_MAGIC
+#define NFS_SUPER_MAGIC 0x6969
+#endif
+
+static int __tapdisk_fs_storage_type(const char *rpath)
+{
+    struct statfs fst;
+    int type, err;
+
+    err = statfs(rpath, &fst);
+    if (err)
+        return -errno;
+
+    switch (fst.f_type) {
+    case NFS_SUPER_MAGIC:
+        type = TAPDISK_STORAGE_TYPE_NFS;
+        break;
+    default:
+        type = TAPDISK_STORAGE_TYPE_EXT;
+        break;
+    }
+
+    return type;
+}
+
+static int
+__tapdisk_blk_storage_type(const char *rpath __attribute__((unused)))
+{
+    return TAPDISK_STORAGE_TYPE_LVM;
+}
+
+int tapdisk_storage_type(const char *path)
+{
+    char rpath[PATH_MAX], *p;
+    struct stat st;
+    int err, rv;
+
+    p = realpath(path, rpath);
+    if (!p)
+        return -errno;
+
+    err = stat(rpath, &st);
+    if (err)
+        return -errno;
+
+    switch (st.st_mode & S_IFMT) {
+    case S_IFBLK:
+        rv = __tapdisk_blk_storage_type(rpath);
+        break;
+    case S_IFREG:
+        rv = __tapdisk_fs_storage_type(rpath);
+        break;
+    default:
+        rv = -EINVAL;
+        break;
+    }
+
+    return rv;
+}
+
+const char *tapdisk_storage_name(int type)
+{
+    switch (type) {
+    case TAPDISK_STORAGE_TYPE_NFS:
+        return "nfs";
+    case TAPDISK_STORAGE_TYPE_EXT:
+        return "ext";
+    case TAPDISK_STORAGE_TYPE_LVM:
+        return "lvm";
+    case -1:
+        return "n/a";
+    default:
+        return "<unknown-type>";
+    }
+}
diff --git a/tools/blktap3/drivers/tapdisk-storage.h 
b/tools/blktap3/drivers/tapdisk-storage.h
new file mode 100644
--- /dev/null
+++ b/tools/blktap3/drivers/tapdisk-storage.h
@@ -0,0 +1,38 @@
+/* 
+ * Copyright (c) 2008, XenSource Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of XenSource Inc. nor the names of its contributors
+ *       may be used to endorse or promote products derived from this software
+ *       without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+ * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef _TAPDISK_STORAGE_H_
+#define _TAPDISK_STORAGE_H_
+
+#define TAPDISK_STORAGE_TYPE_NFS       1
+#define TAPDISK_STORAGE_TYPE_EXT       2
+#define TAPDISK_STORAGE_TYPE_LVM       3
+
+int tapdisk_storage_type(const char *path);
+const char *tapdisk_storage_name(int type);
+
+#endif

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