Re: [PATCH 00/17] VFS: Filesystem information and notifications [ver #17]

[Greg Kroah-Hartman]

On Tue, Mar 03, 2020 at 02:19:58PM +0000, David Howells wrote:
> Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> wrote:
> 
> > +	fd = do_sys_open(dfd, filename, flags, 0000);
> > +	if (fd <= 0)
> > +		return fd;
> > +
> > +	retval = ksys_read(fd, buffer, bufsize);
> > +
> > +	__close_fd(current->files, fd);
> 
> If you can use dentry_open() and vfs_read(), you might be able to avoid
> dealing with file descriptors entirely.  That might make it worth a syscall.

Will poke at that...

> You're going to be asked for writefile() you know ;-)

Yup, that just got asked on this thread already :)

greg k-h