#include <fcntl.h>
#include <syslog.h>
#include <stdlib.h>
+#include <sys/mount.h>
+#include <sys/mman.h>
+#include <errno.h>
#ifndef __GNUC__
#error I need GCC to work
#define MY_NAME "nbd_client"
#include "cliserv.h"
-int opennet(char *name, int port) {
+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) {
+ 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;
int xaddrinlen = sizeof(xaddrin);
struct hostent *hostn;
+ int af;
hostn = gethostbyname(name);
if (!hostn)
err("Gethostname failed: %h\n");
- if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
+ af = AF_INET;
+ if(sdp) {
+#ifdef WITH_SDP
+ af = AF_INET_SDP;
+#else
+ err("Can't do SDP: I was not compiled with SDP support!");
+#endif
+ }
+ if ((sock = socket(af, SOCK_STREAM, IPPROTO_TCP)) < 0)
err("Socket failed: %m");
- xaddrin.sin_family = AF_INET;
+ xaddrin.sin_family = af;
xaddrin.sin_port = htons(port);
xaddrin.sin_addr.s_addr = *((int *) hostn->h_addr);
if ((connect(sock, (struct sockaddr *) &xaddrin, xaddrinlen) < 0))
return sock;
}
-u64 negotiate(int sock, int blocksize) {
+void negotiate(int sock, u64 *rsize64, u32 *flags) {
u64 magic, size64;
char buf[256] = "\0\0\0\0\0\0\0\0\0";
printf("size = %lu", (unsigned long)(size64));
#endif
- if (read(sock, &buf, 128) < 0)
+ if (read(sock, flags, sizeof(*flags)) < 0)
err("Failed/4: %m\n");
+ *flags = ntohl(*flags);
+
+ if (read(sock, &buf, 124) < 0)
+ err("Failed/5: %m\n");
printf("\n");
- return size64;
+ *rsize64 = size64;
}
-void setsizes(int nbd, u64 size64, int blocksize) {
+void setsizes(int nbd, u64 size64, int blocksize, u32 flags) {
unsigned long size;
+ int read_only = (flags & NBD_FLAG_READ_ONLY) ? 1 : 0;
#ifdef NBD_SET_SIZE_BLOCKS
if (size64/blocksize > (~0UL >> 1))
#endif
ioctl(nbd, NBD_CLEAR_SOCK);
+
+ if (ioctl(nbd, BLKROSET, (unsigned long) &read_only) < 0)
+ err("Unable to set read-only attribute for device");
+}
+
+void set_timeout(int nbd, int timeout) {
+#ifdef NBD_SET_TIMEOUT
+ if (timeout) {
+ if (ioctl(nbd, NBD_SET_TIMEOUT, (unsigned long)timeout) < 0)
+ err("Ioctl NBD_SET_TIMEOUT failed: %m\n");
+ fprintf(stderr, "timeout=%d\n", timeout);
+ }
+#endif
}
void finish_sock(int sock, int nbd, int swap) {
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[]) {
char *hostname, *nbddev;
int swap=0;
int cont=0;
+ int timeout=0;
+ int sdp=0;
+ int nofork=0;
u64 size64;
+ u32 flags;
logging();
if (argc < 3) {
errmsg:
fprintf(stderr, "nbd-client version %s\n", PACKAGE_VERSION);
- fprintf(stderr, "Usage: nbd-client [bs=blocksize] 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");
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");
}
++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");
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 blocksize */
}
+ if (strncmp(argv[0], "timeout=", 8)==0) {
+ timeout=atoi(argv[0]+8);
+ ++argv; --argc; /* skip timeout */
+ }
+
if (argc==0) goto errmsg;
hostname=argv[0];
++argv; --argc; /* skip hostname */
++argv; --argc; /* skip port */
if (argc==0) goto errmsg;
- sock = opennet(hostname, port);
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>2) goto errmsg;
- if (argc!=0) {
+ if (argc>3) goto errmsg;
+ if (argc) {
if(strncmp(argv[0], "-swap", 5)==0) {
swap=1;
++argv;--argc;
}
}
- if (argc!=0) {
+ if (argc) {
if(strncmp(argv[0], "-persist", 8)==0) {
cont=1;
++argv;--argc;
}
}
+ if (argc) {
+ if(strncmp(argv[0], "-sdp", 4)==0) {
+ sdp=1;
+ ++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 */
- size64 = negotiate(sock, blocksize);
- setsizes(nbd, size64, blocksize);
+ negotiate(sock, &size64, &flags);
+ setsizes(nbd, size64, blocksize, flags);
+ set_timeout(nbd, timeout);
finish_sock(sock, nbd, swap);
/* 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) {
cont=0;
} else {
if(cont) {
+ u64 new_size;
+ u32 new_flags;
+
fprintf(stderr, " Reconnecting\n");
close(sock); close(nbd);
- sock = opennet(hostname, port);
+ sock = opennet(hostname, port, sdp);
nbd = open(nbddev, O_RDWR);
- if(size64!=negotiate(sock,blocksize)) {
+ negotiate(sock, &new_size, &new_flags);
+ if (size64 != new_size) {
err("Size of the device changed. Bye");
}
- setsizes(nbd, size64, blocksize);
+ setsizes(nbd, size64, blocksize,
+ new_flags);
+
+ set_timeout(nbd, timeout);
finish_sock(sock,nbd,swap);
}
}
projects / nbd.git / blobdiff