Discs must be sized in multiples of 512 bytes or odd things happen

In #36 some of the odd errors were due to seeks beyond the end of the
disc.  This was because the disc was "specially crafted" to be 25GB + 1
byte, which doesn't fit into the normal 512 byte sectors expected of a
disc.  This lead to reads going beyond the end of the disc etc.

If a similarly evil disc is used with `losetup`, it just ignores the
last bytes of the disc that don't fit into 512 chunks.  This is what
that patch does, logging an error at the same time.

src/common/ioutil.c

@@ -97,6 +97,15 @@ int open_and_mmap(const char* filename, int* out_fd, uint64_t *out_size, void **
 		warn("lseek64() failed");
 		return size;
 	}
+
+	/* If discs are not in multiples of 512, then odd things happen,
+	 * resulting in reads/writes past the ends of files.
+	 */
+	if ( size != (size & (~0x1ff))) {
+		warn("file does not fit into 512-byte sectors; the end of the file will be ignored.");
+		size = size & (~0x1ff);
+	}
+
 	if (out_size) {
 		*out_size = size;
 	}

src/server/serve.c

@@ -710,6 +710,15 @@ void serve_init_allocation_map(struct server* params)
 
 	FATAL_IF_NEGATIVE(fd, "Couldn't open %s", params->filename );
 	size = lseek64( fd, 0, SEEK_END );
+
+	/* If discs are not in multiples of 512, then odd things happen,
+	 * resulting in reads/writes past the ends of files.
+	 */ 
+	if ( size != (size & ~0x1ff)) {
+		warn("file does not fit into 512-byte sectors; the end of the file will be ignored.");
+		size &= ~0x1ff;
+	}
+
 	params->size = size;
 	FATAL_IF_NEGATIVE( size, "Couldn't find size of %s",
 			   params->filename );

tests/acceptance/test_serve_mode.rb

@@ -195,4 +195,18 @@ class TestServeMode < Test::Unit::TestCase
     assert_equal 6, op.first[3], 'msync called with incorrect flags'
   end
 
+  def test_odd_size_discs_are_truncated_to_nearest_512
+    # This should get rounded down to 1024
+    @env.blocksize = 1024 + 511
+    @env.writefile1('0')
+    @env.serve1
+    client = FlexNBD::FakeSource.new(@env.ip, @env.port1, 'Connecting to server failed')
+    begin
+      result = client.read_hello
+      assert_equal 'NBDMAGIC', result[:passwd]
+      assert_equal 0x00420281861253, result[:magic]
+      assert_equal 1024, result[:size]
+      client.close
+    end
+  end
 end