increase wipe size from 16KB to 128KB to erase btrfs signatures

diff --git a/src/job-shared.h b/src/job-shared.h
index 27e0cba..6fad7b8 100644 (file)
--- a/src/job-shared.h
+++ b/src/job-shared.h
@@ -105,8 +105,8 @@ _scrub_signatures (int fd, guint64 offset, guint64 size)
 
         ret = FALSE;
 
-        /* wipe first and last 16kb. TODO: check 16kb is the right number */
-        wipe_size = 16 * 1024;
+        /* wipe first and last 128KB. Note that btrfs keeps signatures at 0x10000 == 64KB. */
+        wipe_size = 128 * 1024;
         g_assert (sizeof (buf) >= wipe_size);
 
         if (wipe_size > size) {