mke2fs: do not zero out first kilobyte. Closes 3247

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

diff --git a/util-linux/mkfs_ext2.c b/util-linux/mkfs_ext2.c
index f6ccc9c9ed5fd77cffa7c08613115305215e7b0a..6cbbe0e075fc053b29077bc250b18aea4c452e84 100644 (file)
--- 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)