mke2fs: do not zero out first kilobyte. Closes 3247

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/util-linux/mkfs_ext2.c b/util-linux/mkfs_ext2.c
index f6ccc9c9e..6cbbe0e07 100644
--- a/util-linux/mkfs_ext2.c
+++ b/util-linux/mkfs_ext2.c
@@ -615,7 +615,11 @@ int mkfs_ext2_main(int argc UNUSED_PARAM, char **argv)
 
         // zero boot sectors
         memset(buf, 0, blocksize);
-        PUT(0, buf, 1024); // N.B. 1024 <= blocksize, so buf[0..1023] contains zeros
+        // Disabled: standard mke2fs doesn't do this, and
+        // on SPARC this destroys Sun disklabel.
+        // Users who need/want zeroing can easily do it with dd.
+        //PUT(0, buf, 1024); // N.B. 1024 <= blocksize, so buf[0..1023] contains zeros
+
         // zero inode tables
         for (i = 0; i < ngroups; ++i)
                 for (n = 0; n < inode_table_blocks; ++n)