Re: [PATCH v4 1/8] log-writes: add replay-log program to replay dm-log-writes target

[Eryu Guan <eguan@redhat.com>]

On Thu, Sep 07, 2017 at 01:03:06PM +0300, Amir Goldstein wrote:
> Imported Josef Bacik's code from:
> https://github.com/josefbacik/log-writes.git
> 
> Specialized program for replaying a write log that was recorded by
> device mapper log-writes target.  The tools is used to perform
> crash consistency tests, allowing to run an arbitrary check tool
> (fsck) at specified checkpoints in the write log.
> 
> [Amir:]
> - Add project Makefile and SOURCE files
> - Document the replay-log auxiliary program
> - Address review comments by Eryu Guan
> 
> Cc: Josef Bacik <jbacik@fb.com>
> Signed-off-by: Amir Goldstein <amir73il@gmail.com>
> ---
...
> diff --git a/src/log-writes/log-writes.h b/src/log-writes/log-writes.h
> new file mode 100644
> index 0000000..6cadb66
> --- /dev/null
> +++ b/src/log-writes/log-writes.h
> @@ -0,0 +1,77 @@
> +#ifndef _LOG_WRITES_H_
> +#define _LOG_WRITES_H_
> +
> +#include <linux/types.h>
> +#include <linux/byteorder/little_endian.h>

This only works on little endian hosts, big endian hosts like ppc64 fail
the tests with "Magic doesn't match" error, because le64_to_cpu is an
no-op there.

I did the following changes and it worked for me. If this looks fine to
you, I can fold the changes into the original patch.

--- 8< ---
diff --git a/src/log-writes/log-writes.h b/src/log-writes/log-writes.h
index 14242ee13c6b..0fb324a57c4d 100644
--- a/src/log-writes/log-writes.h
+++ b/src/log-writes/log-writes.h
@@ -2,7 +2,12 @@
 #define _LOG_WRITES_H_

 #include <linux/types.h>
-#include <linux/byteorder/little_endian.h>
+#include <endian.h>
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+#include <linux/byteorder/little_endian.h>
+#else
+#include <linux/byteorder/big_endian.h>
+#endif

 extern int log_writes_verbose;

--- >8 ---
Thanks,
Eryu