// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2003 Jana Saout <jana@saout.de>
 *
 * This file is released under the GPL.
 */

#include <linux/device-mapper.h>

#include <linux/module.h>
#include <linux/init.h>
#include <linux/bio.h>

#define DM_MSG_PREFIX "zero"

/*
 * Construct a dummy mapping that only returns zeros
 */
static int zero_ctr(struct dm_target *ti, unsigned int argc, char **argv)
{
        if (argc != 0) {
                ti->error = "No arguments required";
                return -EINVAL;
        }

        /*
         * Silently drop discards, avoiding -EOPNOTSUPP.
         */
        ti->num_discard_bios = 1;
        ti->discards_supported = true;

        return 0;
}

/*
 * Return zeros only on reads
 */
static int zero_map(struct dm_target *ti, struct bio *bio)
{
        switch (bio_op(bio)) {
        case REQ_OP_READ:
                if (bio->bi_opf & REQ_RAHEAD) {
                        /* readahead of null bytes only wastes buffer cache */
                        return DM_MAPIO_KILL;
                }
                zero_fill_bio(bio);
                break;
        case REQ_OP_WRITE:
        case REQ_OP_DISCARD:
                /* writes get silently dropped */
                break;
        default:
                return DM_MAPIO_KILL;
        }

        bio_endio(bio);

        /* accepted bio, don't make new request */
        return DM_MAPIO_SUBMITTED;
}

static void zero_io_hints(struct dm_target *ti, struct queue_limits *limits)
{
        limits->max_hw_discard_sectors = UINT_MAX;
        limits->discard_granularity = 512;
}

static struct target_type zero_target = {
        .name   = "zero",
        .version = {1, 2, 0},
        .features = DM_TARGET_NOWAIT,
        .module = THIS_MODULE,
        .ctr    = zero_ctr,
        .map    = zero_map,
        .io_hints = zero_io_hints,
};
module_dm(zero);

MODULE_AUTHOR("Jana Saout <jana@saout.de>");
MODULE_DESCRIPTION(DM_NAME " dummy target returning zeros");
MODULE_LICENSE("GPL");