From 5d4d146cfe4ab4e52c8ba0300f6a05949bc558d4 Mon Sep 17 00:00:00 2001
Message-Id: <5d4d146cfe4ab4e52c8ba0300f6a05949bc558d4@dist-git>
From: John Ferlan <jferlan@redhat.com>
Date: Wed, 26 Apr 2017 08:41:11 -0400
Subject: [PATCH] storage: Introduce virStorageBackendZeroPartitionTable

https://bugzilla.redhat.com/show_bug.cgi?id=1439132

Create a wrapper/helper that can be used to call the storage backend
wipe helper - storageBackendVolWipeLocalFile for future use by logical
and disk backends to clear out the partition table rather than having
each open code the same algorithm.

(cherry picked from commit e8b02124580e134c8a6d51750016811b1d68b80e)
Signed-off-by: John Ferlan <jferlan@redhat.com>
Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
---
 src/storage/storage_util.c | 22 ++++++++++++++++++++++
 src/storage/storage_util.h |  4 ++++
 2 files changed, 26 insertions(+)

diff --git a/src/storage/storage_util.c b/src/storage/storage_util.c
index 8dbdc770e..da2396b34 100644
--- a/src/storage/storage_util.c
+++ b/src/storage/storage_util.c
@@ -4071,3 +4071,25 @@ virStorageBackendSCSIFindLUs(virStoragePoolObjPtr pool,
 
     return found;
 }
+
+
+/*
+ * @path: Path to the device to initialize
+ * @size: Size to be cleared
+ *
+ * Zero out possible partition table information for the specified
+ * bytes from the start of the @path and from the end of @path
+ *
+ * Returns 0 on success, -1 on failure with error message set
+ */
+int
+virStorageBackendZeroPartitionTable(const char *path,
+                                    unsigned long long size)
+{
+    if (storageBackendVolWipeLocalFile(path, VIR_STORAGE_VOL_WIPE_ALG_ZERO,
+                                       size, false) < 0)
+        return -1;
+
+    return storageBackendVolWipeLocalFile(path, VIR_STORAGE_VOL_WIPE_ALG_ZERO,
+                                          size, true);
+}
diff --git a/src/storage/storage_util.h b/src/storage/storage_util.h
index fa3b6522c..2c48027f4 100644
--- a/src/storage/storage_util.h
+++ b/src/storage/storage_util.h
@@ -163,4 +163,8 @@ virStorageBackendCreateQemuImgCmdFromVol(virConnectPtr conn,
 int virStorageBackendSCSIFindLUs(virStoragePoolObjPtr pool,
                                  uint32_t scanhost);
 
+int
+virStorageBackendZeroPartitionTable(const char *path,
+                                    unsigned long long size);
+
 #endif /* __VIR_STORAGE_UTIL_H__ */
-- 
2.12.2