#include <syslog.h>
#include <stdlib.h>
#include <sys/mount.h>
+#include <errno.h>
#ifndef __GNUC__
#error I need GCC to work
#define MY_NAME "nbd_client"
#include "cliserv.h"
+int check_conn(char* devname, int do_print) {
+ char buf[256];
+ int fd;
+ int len;
+ if(!strncmp(devname, "/dev/", 5)) {
+ devname+=5;
+ }
+ snprintf(buf, 256, "/sys/block/%s/pid", devname);
+ if((fd=open(buf, O_RDONLY))<0) {
+ if(errno==ENOENT) {
+ return 1;
+ } else {
+ return 2;
+ }
+ }
+ len=read(fd, buf, 256);
+ buf[len-1]='\0';
+ if(do_print) printf("%s\n", buf);
+ return 0;
+}
+
int opennet(char *name, int port, int sdp) {
int sock;
struct sockaddr_in xaddrin;
fprintf(stderr, "nbd-client version %s\n", PACKAGE_VERSION);
fprintf(stderr, "Usage: nbd-client [bs=blocksize] [timeout=sec] host port nbd_device [-swap] [-persist]\n");
fprintf(stderr, "Or : nbd-client -d nbd_device\n");
+ fprintf(stderr, "Or : nbd-client -c nbd_device\n");
fprintf(stderr, "Default value for blocksize is 1024 (recommended for ethernet)\n");
fprintf(stderr, "Allowed values for blocksize are 512,1024,2048,4096\n"); /* will be checked in kernel :) */
fprintf(stderr, "Note, that kernel 2.4.2 and older ones do not work correctly with\n");
printf("done\n");
return 0;
}
+ if(strcmp(argv[0], "-c")==0) {
+ return check_conn(argv[1], 1);
+ }
if (strncmp(argv[0], "bs=", 3)==0) {
blocksize=atoi(argv[0]+3);
++argv; --argc; /* skip port */
if (argc==0) goto errmsg;
- sock = opennet(hostname, port);
nbddev = argv[0];
nbd = open(nbddev, O_RDWR);
if (nbd < 0)
}
}
if(argc) goto errmsg;
+ sock = opennet(hostname, port, sdp);
argv=NULL; argc=0; /* don't use it later suddenly */
negotiate(sock, &size64, &flags);
/* Go daemon */
chdir("/");
+ do {
#ifndef NOFORK
- if (fork())
- exit(0);
+ if (fork()) {
+ while(check_conn(nbddev, 0)) {
+ sleep(1);
+ }
+ open(nbddev, O_RDONLY);
+ exit(0);
+ }
#endif
- do {
if (ioctl(nbd, NBD_DO_IT) < 0) {
fprintf(stderr, "Kernel call returned: %m");
if(errno==EBADR) {
fprintf(stderr, " Reconnecting\n");
close(sock); close(nbd);
- sock = opennet(hostname, port);
+ sock = opennet(hostname, port, sdp);
nbd = open(nbddev, O_RDWR);
negotiate(sock, &new_size, &new_flags);
if (size64 != new_size) {