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https://github.com/xen-project/xen.git
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Keir Fraser
4b1af8b188
Tapdisk control in userspace, a replacement for the original blktap2 control stack, which had to pass a kernel space interface based on sysfs nodes. All tapdisk processes listen for commands on a unix stream socket. The control library supports scanning the socket namespace for running tapdisks, VBD minors allocated, associated images and state inquiry. Control operations include allocating/releasing devices, spawning tapdisks, opening/closing images, attaching disk images to devices. disk pause/resume operations and runtime switching of disk images. Signed-off-by: Jake Wires <jake.wires@citrix.com> Signed-off-by: Daniel Stodden <daniel.stodden@citrix.com>
134 lines
3.3 KiB
C
134 lines
3.3 KiB
C
/*
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* Copyright (c) 2008, XenSource Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of XenSource Inc. nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#ifdef MEMSHR
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#include <memshr.h>
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#endif
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#include "tapdisk.h"
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#include "tapdisk-utils.h"
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#include "tapdisk-server.h"
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#include "tapdisk-control.h"
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static void
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usage(const char *app, int err)
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{
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fprintf(stderr, "usage: %s <-u uuid> <-c control socket>\n", app);
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exit(err);
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}
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int
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main(int argc, char *argv[])
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{
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char *control;
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int c, err, nodaemon;
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control = NULL;
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nodaemon = 0;
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while ((c = getopt(argc, argv, "s:Dh")) != -1) {
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switch (c) {
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case 'D':
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nodaemon = 1;
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break;
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case 'h':
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usage(argv[0], 0);
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break;
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case 's':
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#ifdef MEMSHR
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memshr_set_domid(atoi(optarg));
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#else
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fprintf(stderr, "MEMSHR support not compiled in.\n");
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exit(EXIT_FAILURE);
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#endif
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break;
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default:
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usage(argv[0], EINVAL);
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}
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}
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if (optind != argc)
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usage(argv[0], EINVAL);
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chdir("/");
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tapdisk_start_logging("tapdisk2");
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err = tapdisk_server_init();
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if (err) {
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DPRINTF("failed to initialize server: %d\n", err);
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goto out;
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}
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if (!nodaemon) {
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err = daemon(0, 1);
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if (err) {
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DPRINTF("failed to daemonize: %d\n", errno);
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goto out;
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}
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}
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err = tapdisk_control_open(&control);
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if (err) {
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DPRINTF("failed to open control socket: %d\n", err);
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goto out;
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}
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fprintf(stdout, "%s\n", control);
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fflush(stdout);
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if (!nodaemon) {
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int fd;
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fd = open("/dev/null", O_RDWR);
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if (fd != -1) {
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dup2(fd, STDIN_FILENO);
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dup2(fd, STDOUT_FILENO);
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dup2(fd, STDERR_FILENO);
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if (fd > 2)
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close(fd);
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}
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}
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err = tapdisk_server_complete();
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if (err) {
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DPRINTF("failed to complete server: %d\n", err);
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goto out;
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}
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err = tapdisk_server_run();
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out:
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tapdisk_control_close();
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tapdisk_stop_logging();
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return err;
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}
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