From: Keith Busch <[email protected]>
To: Al Viro <[email protected]>
Cc: Keith Busch <[email protected]>,
[email protected], [email protected],
[email protected], [email protected],
[email protected], [email protected]
Subject: Re: [PATCH 4/5] io_uring: add support for dma pre-mapping
Date: Wed, 27 Jul 2022 07:58:29 -0600 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <YuB09cZh7rmd260c@ZenIV>
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.
next prev parent reply other threads:[~2022-07-27 13:58 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-26 17:38 [PATCH 0/5] dma mapping optimisations Keith Busch
2022-07-26 17:38 ` [PATCH 1/5] blk-mq: add ops to dma map bvec Keith Busch
2022-07-26 17:38 ` [PATCH 2/5] iov_iter: introduce type for preregistered dma tags Keith Busch
2022-07-26 23:10 ` Al Viro
2022-07-27 13:52 ` Keith Busch
2022-07-26 17:38 ` [PATCH 3/5] block: add dma tag bio type Keith Busch
2022-07-26 17:38 ` [PATCH 4/5] io_uring: add support for dma pre-mapping Keith Busch
2022-07-26 23:12 ` Al Viro
2022-07-27 13:58 ` Keith Busch [this message]
2022-07-27 14:04 ` Al Viro
2022-07-27 15:04 ` Keith Busch
2022-07-27 22:32 ` Dave Chinner
2022-07-27 23:00 ` Keith Busch
2022-07-28 2:35 ` Dave Chinner
2022-07-28 13:25 ` Keith Busch
2022-07-27 14:11 ` Al Viro
2022-07-27 14:48 ` Keith Busch
2022-07-27 15:26 ` Al Viro
2022-07-26 17:38 ` [PATCH 5/5] nvme-pci: implement dma_map support Keith Busch
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