xfsdocs: document known testing procedures

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

3 files changed, 39 insertions, 0 deletions

diff --git a/design/XFS_Filesystem_Structure/docinfo.xml b/design/XFS_Filesystem_Structure/docinfo.xml
index ba97809..cc5596d 100644
--- a/design/XFS_Filesystem_Structure/docinfo.xml
+++ b/design/XFS_Filesystem_Structure/docinfo.xml
@@ -108,4 +108,18 @@
 			</simplelist>
 		</revdescription>
 	</revision>
+	<revision>
+		<revnumber>3.14</revnumber>
+		<date>January 2016</date>
+		<author>
+			<firstname>Darrick</firstname>
+			<surname>Wong</surname>
+			<email></email>
+		</author>
+		<revdescription>
+			<simplelist>
+				<member>Document disk format change testing.</member>
+			</simplelist>
+		</revdescription>
+	</revision>
 </revhistory>
diff --git a/design/XFS_Filesystem_Structure/testing.asciidoc b/design/XFS_Filesystem_Structure/testing.asciidoc
new file mode 100644
index 0000000..f1c90bc
--- /dev/null
+++ b/design/XFS_Filesystem_Structure/testing.asciidoc
@@ -0,0 +1,23 @@
+[[Testing]]
+= Testing Filesystem Changes
+
+People put a lot of trust in filesystems to preserve their data in a reliable
+fashion.  To that end, it is very important that users and developers have
+access to a suite of regression tests that can be used to prove correct
+operation of any given filesystem code, or to analyze failures to fix problems
+found in the code.  The XFS regression test suite, +xfstests+, is hosted at
++git://git.kernel.org/pub/scm/fs/xfs/xfstests-dev.git+.  Most tests apply to
+filesystems in general, but the suite also contains tests for features specific
+to each filesystem.
+
+When fixing bugs, it is important to provide a testcase exposing the bug so
+that the developers can avoid a future re-occurrence of the regression.
+Furthermore, if you're developing a new user-visible feature for XFS, please
+help the rest of the development community to sustain and maintain the whole
+codebase by providing generous test coverage to check its behavior.
+
+When altering, adding, or removing an on-disk data structure, please remember
+to update both the in-kernel structure size checks in +xfs_ondisk.h+ and to
+ensure that your changes are reflected in xfstest xfs/122.  These regression
+tests enable us to detect compiler bugs, alignment problems, and anything
+else that might result in the creation of incompatible filesystem images.
diff --git a/design/XFS_Filesystem_Structure/xfs_filesystem_structure.asciidoc b/design/XFS_Filesystem_Structure/xfs_filesystem_structure.asciidoc
index 53262bf..f580aab 100644
--- a/design/XFS_Filesystem_Structure/xfs_filesystem_structure.asciidoc
+++ b/design/XFS_Filesystem_Structure/xfs_filesystem_structure.asciidoc
@@ -52,6 +52,8 @@ include::common_types.asciidoc[]
 
 include::magic.asciidoc[]
 
+include::testing.asciidoc[]
+
 // return titles to normal
 :leveloffset: 0