91 lines
2.3 KiB
C
91 lines
2.3 KiB
C
/*
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* busexmp - example memory-based block device using BUSE
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* Copyright (C) 2013 Adam Cozzette
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "buse.h"
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static void *data;
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static int xmpl_debug = 1;
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static int xmp_read(void *buf, u_int32_t len, u_int64_t offset, void *userdata)
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{
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if (*(int *)userdata)
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fprintf(stderr, "R - %lu, %u\n", offset, len);
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memcpy(buf, (char *)data + offset, len);
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return 0;
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}
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static int xmp_write(const void *buf, u_int32_t len, u_int64_t offset, void *userdata)
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{
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if (*(int *)userdata)
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fprintf(stderr, "W - %lu, %u\n", offset, len);
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memcpy((char *)data + offset, buf, len);
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return 0;
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}
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static void xmp_disc(void *userdata)
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{
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(void)(userdata);
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fprintf(stderr, "Received a disconnect request.\n");
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}
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static int xmp_flush(void *userdata)
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{
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(void)(userdata);
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fprintf(stderr, "Received a flush request.\n");
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return 0;
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}
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static int xmp_trim(u_int64_t from, u_int32_t len, void *userdata)
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{
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(void)(userdata);
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fprintf(stderr, "T - %lu, %u\n", from, len);
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return 0;
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}
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static struct buse_operations aop = {
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.read = xmp_read,
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.write = xmp_write,
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.disc = xmp_disc,
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.flush = xmp_flush,
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.trim = xmp_trim,
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.size = 128 * 1024 * 1024,
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};
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int main(int argc, char *argv[])
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{
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if (argc != 2)
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{
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fprintf(stderr,
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"Usage:\n"
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" %s /dev/nbd0\n"
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"Don't forget to load nbd kernel module (`modprobe nbd`) and\n"
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"run example from root.\n", argv[0]);
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return 1;
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}
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data = malloc(aop.size);
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return buse_main(argv[1], &aop, (void *)&xmpl_debug);
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}
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