#include <syslog.h>
#include <stdlib.h>
#include <sys/mount.h>
+#include <sys/mman.h>
#include <errno.h>
#ifndef __GNUC__
#define MY_NAME "nbd_client"
#include "cliserv.h"
-int check_conn(char* devname) {
+int check_conn(char* devname, int do_print) {
char buf[256];
+ char* p;
int fd;
int len;
if(!strncmp(devname, "/dev/", 5)) {
devname+=5;
}
+ if((p=strchr(devname, 'p'))) {
+ /* We can't do checks on partitions. */
+ *p='\0';
+ }
snprintf(buf, 256, "/sys/block/%s/pid", devname);
if((fd=open(buf, O_RDONLY))<0) {
if(errno==ENOENT) {
}
len=read(fd, buf, 256);
buf[len-1]='\0';
- printf("%s\n", buf);
+ if(do_print) printf("%s\n", buf);
return 0;
}
if (ioctl(nbd, NBD_SET_SOCK, sock) < 0)
err("Ioctl NBD_SET_SOCK failed: %m\n");
+/*
+ * If anyone ever forward-patches this patch, I'll happily re-enable
+ * this code. Until then...
#ifndef SO_SWAPPING
if (swap)
err("You have to compile me on machine with swapping patch enabled in order to use it later.");
if (setsockopt(sock, SOL_SOCKET, SO_SWAPPING, &one, sizeof(int)) < 0)
err("Could not enable swapping: %m");
#endif
+*/
+ mlockall(MCL_CURRENT | MCL_FUTURE);
}
int main(int argc, char *argv[]) {
int cont=0;
int timeout=0;
int sdp=0;
+ int nofork=0;
u64 size64;
u32 flags;
if (argc < 3) {
errmsg:
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, "Usage: nbd-client [bs=blocksize] [timeout=sec] host port nbd_device [-swap] [-persist] [-nofork]\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");
}
++argv; --argc; /* skip programname */
-
+
if (strcmp(argv[0], "-d")==0) {
nbd = open(argv[1], O_RDWR);
if (nbd < 0)
- err("Can not open NBD: %m");
+ err("Cannot open NBD: %m\nPlease ensure the 'nbd' module is loaded.");
printf("Disconnecting: que, ");
if (ioctl(nbd, NBD_CLEAR_QUE)< 0)
err("Ioctl failed: %m\n");
return 0;
}
if(strcmp(argv[0], "-c")==0) {
- return check_conn(argv[1]);
+ return check_conn(argv[1], 1);
}
if (strncmp(argv[0], "bs=", 3)==0) {
nbddev = argv[0];
nbd = open(nbddev, O_RDWR);
if (nbd < 0)
- err("Can not open NBD: %m");
+ err("Cannot open NBD: %m\nPlease ensure the 'nbd' module is loaded.");
++argv; --argc; /* skip device */
if (argc>3) goto errmsg;
++argv;--argc;
}
}
+ if (argc) {
+ if(strncmp(argv[0], "-nofork", 7)==0) {
+ nofork=1;
+ ++argv;--argc;
+ }
+ }
if(argc) goto errmsg;
sock = opennet(hostname, port, sdp);
argv=NULL; argc=0; /* don't use it later suddenly */
/* Go daemon */
- chdir("/");
+ daemon(0,0);
+ do {
#ifndef NOFORK
- if (fork())
- exit(0);
+ if (!nofork) {
+ 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) {