* <pavel@atrey.karlin.mff.cuni.cz>
*
* Version 1.0 - 64bit issues should be fixed, now
+ * Version 1.1 - added bs (blocksize) option (Alexey Guzeev, aga@permonline.ru)
+ * Version 1.2 - I added new option '-d' to send the disconnect request
+ * Version 2.0 - Version synchronised with server
+ * Version 2.1 - Check for disconnection before INIT_PASSWD is received
+ * to make errormsg a bit more helpful in case the server can't
+ * open the exported file.
*/
-/* I added new option '-d' to send the disconnect request */
+#include "config.h"
+#include "lfs.h"
#include <asm/page.h>
#include <sys/ioctl.h>
#include <syslog.h>
#include <stdlib.h>
-#define MY_NAME "nbd_client"
#ifndef __GNUC__
#error I need GCC to work
#endif
#include <linux/ioctl.h>
+#define MY_NAME "nbd_client"
#include "cliserv.h"
int opennet(char *name, int port)
int main(int argc, char *argv[])
{
- int port, sock, nbd, one = 1;
+ int port, sock, nbd;
u64 magic, size64;
unsigned long size;
char buf[256] = "\0\0\0\0\0\0\0\0\0";
- int swap = (argc > 4);
+ int blocksize=1024;
+ char *hostname;
+ int swap=0;
logging();
- if (argc < 2) {
+ if (argc < 3) {
errmsg:
- fprintf(stderr, "Usage: host port nbd_device -swap\n");
- fprintf(stderr, "or -d nbd_device \n");
+ fprintf(stderr, "nbd-client version %s\n", PACKAGE_VERSION);
+ fprintf(stderr, "Usage: nbd-client [bs=blocksize] host port nbd_device [-swap]\n");
+ fprintf(stderr, "Or : nbd-client -d 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");
+ fprintf(stderr, "blocksizes other than 1024 without patches\n");
return 1;
}
- if (strcmp(argv[1],"-d")==0) {
- nbd = open(argv[2], O_RDWR);
- if (nbd < 0)
- err("Can not open NBD: %m");
- printf("Disconnecting: que, ");
- if (ioctl(nbd, NBD_CLEAR_QUE)< 0)
- err("Ioctl failed: %m\n");
- printf("disconnect, ");
+ ++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");
+ printf("Disconnecting: que, ");
+ if (ioctl(nbd, NBD_CLEAR_QUE)< 0)
+ err("Ioctl failed: %m\n");
+ printf("disconnect, ");
#ifdef NBD_DISCONNECT
- if (ioctl(nbd, NBD_DISCONNECT)<0)
- err("Ioctl failed: %m\n");
- printf("sock, ");
+ if (ioctl(nbd, NBD_DISCONNECT)<0)
+ err("Ioctl failed: %m\n");
+ printf("sock, ");
#else
- die("Can't disconnect: I was not compiled with disconnect support!\n" );
+ fprintf(stderr, "Can't disconnect: I was not compiled with disconnect support!\n" );
+ exit(1);
#endif
- if (ioctl(nbd, NBD_CLEAR_SOCK)<0)
- err("Ioctl failed: %m\n");
- printf("done\n");
- return 0;
+ if (ioctl(nbd, NBD_CLEAR_SOCK)<0)
+ err("Ioctl failed: %m\n");
+ printf("done\n");
+ return 0;
}
- if (argc<4) goto errmsg;
- port = atoi(argv[2]);
- sock = opennet(argv[1], port);
- nbd = open(argv[3], O_RDWR);
+ if (strncmp(argv[0], "bs=", 3)==0) {
+ blocksize=atoi(argv[0]+3);
+ ++argv; --argc; /* skip blocksize */
+ }
+
+ if (argc==0) goto errmsg;
+ hostname=argv[0];
+ ++argv; --argc; /* skip hostname */
+
+ if (argc==0) goto errmsg;
+ port = atoi(argv[0]);
+ ++argv; --argc; /* skip port */
+
+ if (argc==0) goto errmsg;
+ sock = opennet(hostname, port);
+ nbd = open(argv[0], O_RDWR);
if (nbd < 0)
err("Can not open NBD: %m");
+ ++argv; --argc; /* skip device */
+
+ if (argc>1) goto errmsg;
+ if (argc!=0) swap=1;
+ argv=NULL; argc=0; /* don't use it later suddenly */
printf("Negotiation: ");
if (read(sock, buf, 8) < 0)
err("Failed/1: %m");
+ if (strlen(buf)==0)
+ err("Server closed connection");
if (strcmp(buf, INIT_PASSWD))
err("INIT_PASSWD bad");
printf(".");
if (read(sock, &size64, sizeof(size64)) < 0)
err("Failed/3: %m\n");
size64 = ntohll(size64);
- if (size64 > (~0UL >> 1)) {
+
#ifdef NBD_SET_SIZE_BLOCKS
- if ((size64 >> 10) > (~0UL >> 1)) {
- printf("size = %luMB", (unsigned long)(size64>>20));
- err("Exported device is too big for me. Get 64-bit machine :-(\n");
- } else
- printf("size = %luKB", (unsigned long)(size64>>10));
+ if ((size64>>10) > (~0UL >> 1)) {
+ printf("size = %luMB", (unsigned long)(size64>>20));
+ err("Exported device is too big for me. Get 64-bit machine :-(\n");
+ } else
+ printf("size = %luKB", (unsigned long)(size64>>10));
#else
+ if (size64 > (~0UL >> 1)) {
printf("size = %luKB", (unsigned long)(size64>>10));
err("Exported device is too big. Get 64-bit machine or newer kernel :-(\n");
-#endif
} else
printf("size = %lu", (unsigned long)(size64));
+#endif
if (read(sock, &buf, 128) < 0)
err("Failed/4: %m\n");
printf("\n");
- if (size64 > (~0UL >> 1)) {
#ifdef NBD_SET_SIZE_BLOCKS
- if ((size64 >> 10) > (~0UL >> 1))
- /*
- * If you really need NBDs larger than 2TB on 32-bit
- * machines you can use blocksizes larger than 1kB
- * - FIXME
- */
- err("Device too large.\n");
- else {
- int er;
-
- if (ioctl(nbd, NBD_SET_BLKSIZE, 1UL << 10) < 0)
- err("Ioctl/1.1a failed: %m\n");
- size = (unsigned long)(size64 >> 10);
- if ((er = ioctl(nbd, NBD_SET_SIZE_BLOCKS, size)) < 0)
- err("Ioctl/1.1b failed: %m\n");
- }
+ if (size64/blocksize > (~0UL >> 1))
+ err("Device too large.\n");
+ else {
+ int er;
+ if (ioctl(nbd, NBD_SET_BLKSIZE, (unsigned long)blocksize) < 0)
+ err("Ioctl/1.1a failed: %m\n");
+ size = (unsigned long)(size64/blocksize);
+ if ((er = ioctl(nbd, NBD_SET_SIZE_BLOCKS, size)) < 0)
+ err("Ioctl/1.1b failed: %m\n");
+fprintf(stderr, "bs=%d, sz=%lu\n", blocksize, size);
+ }
#else
+ if (size64 > (~0UL >> 1)) {
err("Device too large.\n");
-#endif
} else {
size = (unsigned long)size64;
if (ioctl(nbd, NBD_SET_SIZE, size) < 0)
err("Ioctl/1 failed: %m\n");
}
+#endif
+
ioctl(nbd, NBD_CLEAR_SOCK);
if (ioctl(nbd, NBD_SET_SOCK, sock) < 0)
err("Ioctl/2 failed: %m\n");
#else
if (swap)
if (setsockopt(sock, SOL_SOCKET, SO_SWAPPING, &one, sizeof(int)) < 0)
- err("Could not enable swapping: %m");
+ err("Could not enable swapping: %m");
#endif
-
+
/* Go daemon */
-
+
chdir("/");
if (fork())
exit(0);
-
+
if (ioctl(nbd, NBD_DO_IT) < 0)
fprintf(stderr, "Kernel call returned: %m");
else
projects / nbd.git / blobdiff