NFS mount flags error!

时间：2006-11-09 来源：hoog

需要写一个用来mount远地nfs server的程序，用户态，由于安全考虑不使用system方式挂载，而直接使用系统api，可是遇到了问题，下面是写的代码?测试结果是，不能每次都mount上磁盘，运气好的话，可以mount上远地的nfs，可是不是每次都成功，而且不成功的次数大多数。非常郁闷，希望大家的帮助。
#include <sys/mount.h>
#include <linux/nfs_mount.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <string.h>
#include <sys/param.h>

#define PBUFSIZE       8192

static char *target="/mnt/gt11server";
static char *source="192.168.0.11:/mnt/ramdisk/";
static char *filesystemtype="nfs";
static unsigned long  mountflags = MS_MGC_VAL ;
static int  nfs_mount_version = NFS_MOUNT_VERSION;

int main(){
      int ret = 0;
      int sockfd, n ,ksock;
      struct sockaddr_in seradd, cliadd;
      struct nfs_mount_data data;
      struct nfs_fh *root_fh = (struct nfs_fs *)malloc(sizeof(struct nfs_fh));
      int bufsize = 32*1024;  //32k

      if ( (sockfd = socket(AF_INET, SOCK_STREAM, IPPROTO_UDP)) < 0)
               fprintf(stderr,"socket error");

      setsockopt(sockfd, SOL_SOCKET, SO_RCVBUF, &bufsize, sizeof(bufsize));
      bind( sockfd, (struct sockaddr* )& seradd, sizeof(seradd));

      ksock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
      bind(ksock, (struct sockaddr*)&cliadd, sizeof(cliadd));

//-------------modifed by
      memset(&data, 0, sizeof(data));
      data.version = nfs_mount_version;
      data.fd       = ksock;
      data.old_root = *root_fh;
      data.flags    = NFS_MOUNT_INTR | NFS_MOUNT_NOCTO;
      data.rsize    = PBUFSIZE;
data.timeo    = 600;
      data.retrans = 10;
      data.acregmin = 3;
      data.acregmax = 60;
      data.acdirmin = 30;
      data.acdirmax = 60;
      data.addr    = seradd;
      strcpy(data.hostname, "localhost");
      data.namlen    = 256;
      data.bsize    = 256;
      data.root    = *root_fh;

//------------------------

      ret = mount(source, target, filesystemtype, mountflags, &data);
      printf("ret is %d\n", ret);
      if (ret != 0){
            printf("mount error happened!\n");
            return -1;
      }

      printf("mount successfully! \n source: %s\n target: %s\n filesystemtype: %s\n ",
                                             source, target, filesystemtype);
/*    ret = umount (target);
      if (ret != 0){
            fprintf(stderr, "umount error happened!\n");
            return -1;
      }*/
      return 0;
}

本程序的灵感来自：
Re: NFS/RPC 2.2.13 request slot
Olaf Flebbe ([email protected])
Tue, 9 Nov 1999 22:15:37 +0100 (MET)

Messages sorted by: [ date ][ thread ][ subject ][ author ]
Next message: Riccardo Facchetti: "Bounced e-mails"
Previous message: [email protected]: "RE: Memory details not shown for 2.3.26"

--------------------------------------------------------------------------------
On Tue, 9 Nov 1999, Trond Myklebust wrote:

> >>>>> " " == Olaf Flebbe <[email protected]> writes:
>
>
> > But, the client (both plptools and amd) get an error message!
> > This shouldn't be. What can a client to against it?
>
> Which error message do they get, and what are the mount options being
> used?

from an strace of an cp to the mounted dir

write(5, "\310\223\372|7s\356!\215\245e\301o$\rG\356\36\270\230b"..., 4096) = -1 ENOSPC (No space left on device)

(The diagnostic is incorrect)

> Don't forget that if you're specifying the 'soft' mount option, then a
> major timeout will cause the error message -EIO to be sent to the
> application.

It does a hard mount...

nfs_mount_data.version = NFS_MOUNT_VERSION;
nfs_mount_data.fd = ksock;
nfs_mount_data.root = *root_fh; /* structure copy */
nfs_mount_data.flags = NFS_MOUNT_INTR | NFS_MOUNT_NOCTO;
nfs_mount_data.rsize = PBUFSIZE;
nfs_mount_data.wsize = PBUFSIZE;
nfs_mount_data.timeo = 600;
nfs_mount_data.retrans = 10; /* default 3 */
nfs_mount_data.acregmin = 3; /* default 3 seconds */
nfs_mount_data.acregmax = 60; /* default 60 seconds */
nfs_mount_data.acdirmin = 30; /* default 30 seconds */
nfs_mount_data.acdirmax = 60; /* default 60 seconds */
nfs_mount_data.addr = sain; /* structure copy */
strcpy(nfs_mount_data.hostname, PSIONHOSTNAME);

if (connect(ksock, (struct sockaddr *) &nfs_mount_data.addr, sizeof(nfs_mount_data.addr)) < 0) {
errorlog("Cannot connect to plpnfsd: %m\n");
exit(1);
}
mount_flags = MS_MGC_VAL;

if (mount("nfs", dir, "nfs", mount_flags, &nfs_mount_data)){

....
Cheers,

Olaf

---

  Dr. Olaf Flebbe                         Phone +49 (0)7071-9457-32
  science + computing gmbh                   FAX +49 (0)7071-9457-27
  Hagellocher Weg 71
  D-72070 Tuebingen  Email: [email protected]

   The amount of work to be done increases in proportion to the
               amount of work already completed.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
Please read the FAQ at http://www.tux.org/lkml/

--------------------------------------------------------------------------------

Next message: Riccardo Facchetti: "Bounced e-mails"
Previous message: [email protected]: "RE: Memory details not shown for 2.3.26"