Hi,
I have a piece of code in my 2.6 kernel that associates an ioctl
file_operation to nfs in file.c and dir.c.
This ioctl sends the nfs_fh to a userland application.
I have been trying to remove this ugly code by creating my own device
and implementing the ioctl but I keep getting junk instead.
Please tell me if I'm doing anything wrong here:
1) Define the I/O structure:
struct nfs_getfh {
int fd;
struct nfs_fh *fh;
};
2) Receive the fd of the wanted file/dir.
3) inside the ioctl function:
struct file *filp;
struct dentry *dentp;
struct inode *inop;
struct nfs_getfh getfh;
struct files_struct *files;
struct nfs_getfh __user *user_getfh = (struct nfs_getfh __user *)
arg;
files = current->files;
if (files) {
spin_lock(&files->file_lock);
filp = fcheck(getfh.fd);
if (filp) {
dentp = dget(filp->f_dentry);
if (dentp) {
inop = dentp->d_inode;
if (inop) {
getfh.fh = NFS_FH(inop);
if (getfh.fh) {
copy_to_user((void*) user_getfh->fh, getfh.fh,
getfh.fh->size + ((int) &((struct nfs_fh*)0)->data)))
}
}
}
}
spin_unlock(&files->file_lock);
}
Best Regards,
Menny
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