diff options
Diffstat (limited to 'sys/dev/dm/dm_target_zero.c')
| -rw-r--r-- | sys/dev/dm/dm_target_zero.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/sys/dev/dm/dm_target_zero.c b/sys/dev/dm/dm_target_zero.c new file mode 100644 index 00000000000..b2defff836c --- /dev/null +++ b/sys/dev/dm/dm_target_zero.c @@ -0,0 +1,108 @@ +/* $NetBSD: dm_target_zero.c,v 1.2 2008/12/19 15:24:03 haad Exp $ */ + +/* + * Copyright (c) 2008 The NetBSD Foundation, Inc. + * All rights reserved. + * + * This code is derived from software contributed to The NetBSD Foundation + * by Adam Hamsik. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS + * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + + +/* + * This file implements initial version of device-mapper zero target. + */ +#include <sys/types.h> +#include <sys/param.h> + +#include <sys/buf.h> + +#include "dm.h" + +/* + * Zero target init function. This target doesn't need + * target specific config area. + */ +int +dm_target_zero_init(dm_dev_t *dmv, void **target_config, char *argv) +{ + + printf("Zero target init function called!!\n"); + + dmv->dev_type = DM_ZERO_DEV; + + *target_config = NULL; + + return 0; +} + +/* Status routine called to get params string. */ +char * +dm_target_zero_status(void *target_config) +{ + return NULL; +} + + +/* + * This routine does IO operations. + */ +int +dm_target_zero_strategy(dm_table_entry_t *table_en, struct buf *bp) +{ + + /* printf("Zero target read function called %d!!\n", bp->b_bcount); */ + + memset(bp->b_data, 0, bp->b_bcount); + bp->b_resid = 0; /* nestiobuf_done wants b_resid = 0 to be sure + that there is no other io to done */ + + biodone(bp); + + return 0; +} + +/* Doesn't not need to do anything here. */ +int +dm_target_zero_destroy(dm_table_entry_t *table_en) +{ + table_en->target_config = NULL; + + return 0; +} + +/* Doesn't not need to do anything here. */ +int +dm_target_zero_deps(dm_table_entry_t *table_en, prop_array_t prop_array) +{ + return 0; +} + +/* Unsuported for this target. */ +int +dm_target_zero_upcall(dm_table_entry_t *table_en, struct buf *bp) +{ + return 0; +} + |
