[PATCH 4/5] io_uring: add support for dma pre-mapping

[Keith Busch]

On Wed, Jul 27, 2022 at 12:12:53AM +0100, Al Viro wrote:
> On Tue, Jul 26, 2022 at 10:38:13AM -0700, Keith Busch wrote:
> 
> > +	if (S_ISBLK(file_inode(file)->i_mode))
> > +		bdev = I_BDEV(file->f_mapping->host);
> > +	else if (S_ISREG(file_inode(file)->i_mode))
> > +		bdev = file->f_inode->i_sb->s_bdev;
> 
> *blink*
> 
> Just what's the intended use of the second case here?

??

The use case is same as the first's: dma map the user addresses to the backing
storage. There's two cases here because getting the block_device for a regular
filesystem file is different than a raw block device.