Re: [PATCH] direct-IO API change

[Andrew Morton]

Linus Torvalds wrote:
> 
> On Fri, 4 Oct 2002, Chuck Lever wrote:
> >
> > this patch adds a "struct file *" argument to direct I/O.  this is needed
> > by NFS direct I/O to make the file's credentials available to direct I/O
> > subroutines.  we can't remove "struct inode *" yet because the raw driver
> > still needs it.
> 
> Why isn't the raw driver changed to just use file->f_dentry->d_inode
> instead?
> 

Because the file handle which we have is for /dev/raw/raw0,
not for /dev/hda1.

The raw driver binds to major/minor, not a file*.  I considered
changing that (change userspace to pass the open fd).  But didn't.

An alternative would be to rewrite i_mapping for /dev/raw/raw0
to be bdev->bd_inode->i_mapping.  I guess we should look at doing
that.