From: Peter Krempa <pkrempa@redhat.com>
Date: Mon, 16 Oct 2017 11:42:21 +0000 (+0200)
Subject: storage: Add feature check for storage file backend supporting access check
X-Git-Tag: v3.10.0-rc1~252
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a93d750a7ee7b4eda28be3d2c1be06142419b98b;p=thirdparty%2Flibvirt.git

storage: Add feature check for storage file backend supporting access check

When the user provides backing chain, we don't need the full support for
traversing the backing chain. This patch adds a feature check for the
virStorageSourceAccess API.
---

diff --git a/src/storage/storage_source.c b/src/storage/storage_source.c
index e3c5c3285a..cced5308c7 100644
--- a/src/storage/storage_source.c
+++ b/src/storage/storage_source.c
@@ -95,6 +95,26 @@ virStorageFileSupportsSecurityDriver(const virStorageSource *src)
 }
 
 
+/**
+ * virStorageFileSupportsAccess:
+ *
+ * @src: a storage file structure
+ *
+ * Check if a storage file supports checking if the storage source is accessible
+ * for the given vm.
+ */
+bool
+virStorageFileSupportsAccess(const virStorageSource *src)
+{
+    virStorageFileBackendPtr backend;
+
+    if (!(backend = virStorageFileGetBackendForSupportCheck(src)))
+        return false;
+
+    return !!backend->storageFileAccess;
+}
+
+
 void
 virStorageFileDeinit(virStorageSourcePtr src)
 {
diff --git a/src/storage/storage_source.h b/src/storage/storage_source.h
index 6462baf6ae..320ea3cab7 100644
--- a/src/storage/storage_source.h
+++ b/src/storage/storage_source.h
@@ -41,6 +41,7 @@ int virStorageFileAccess(virStorageSourcePtr src, int mode);
 int virStorageFileChown(const virStorageSource *src, uid_t uid, gid_t gid);
 
 bool virStorageFileSupportsSecurityDriver(const virStorageSource *src);
+bool virStorageFileSupportsAccess(const virStorageSource *src);
 
 int virStorageFileGetMetadata(virStorageSourcePtr src,
                               uid_t uid, gid_t gid,