i'm trying to get userfs to work on 2.2.16.
as i understand it, userfs uses pipe(2) to create a communication means
between kernel & userland, passes the fd's to kernel userfs.o module
during the mount(2) call and in read_super userfs does a
if ((toproc = fcheck_task(current,mntinfo->fromkern)) == NULL )
{
printk("userfs_read_super: bad fromkern fd %d\n",
mntinfo->fromkern);
goto fail;
}
AFAICT, the mntinfo struct is correctly passed in and the fd number
is correct, but fcheck_task fails...
from /usr/include/linux/file.h
/*
* Check whether the specified task has the fd open. Since the task
* may not have a files_struct, we must test for p->files != NULL.
*/
extern inline struct file * fcheck_task(struct task_struct *p, unsigned int fd)
{
struct file * file = NULL;
if (p->files && fd < p->files->max_fds)
file = p->files->fd[fd];
return file;
}
does anyone have an idea why an fd made from pipe(2) passed into userfs.o
would not have an associated file as far the kernel is concerned?
thanks for any help.
jr
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