metadump: zero out clean log
When doing an xfs_metadump, if the log is clean, zero it out
for 2 reasons:
* It'll make the image more compressible
* It'll eliminate an un-obfuscated metadata source
If the log isn't clean, and the user expected obfuscation, warn
that metadata in the log will not be obfuscated.
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
diff --git a/db/metadump.c b/db/metadump.c
index bea4e00..eb5e9da 100644
--- a/db/metadump.c
+++ b/db/metadump.c
@@ -17,6 +17,7 @@
*/
#include <libxfs.h>
+#include <libxlog.h>
#include "bmap.h"
#include "command.h"
#include "metadump.h"
@@ -2169,6 +2170,8 @@
static int
copy_log(void)
{
+ int dirty;
+
if (show_progress)
print_progress("Copying log");
@@ -2180,6 +2183,31 @@
print_warning("cannot read log");
return !stop_on_read_error;
}
+
+ dirty = xlog_is_dirty(mp, &x, 0);
+
+ switch (dirty) {
+ case 0:
+ /* clear out a clean log */
+ if (show_progress)
+ print_progress("Zeroing clean log");
+ memset(iocur_top->data, 0,
+ mp->m_sb.sb_logblocks * mp->m_sb.sb_blocksize);
+ break;
+ case 1:
+ /* keep the dirty log */
+ if (obfuscate)
+ print_warning(
+_("Filesystem log is dirty; image will contain unobfuscated metadata in log."));
+ break;
+ case -1:
+ /* log detection error */
+ if (obfuscate)
+ print_warning(
+_("Could not discern log; image will contain unobfuscated metadata in log."));
+ break;
+ }
+
return !write_buf(iocur_top);
}
