linux-kernel - Re: [PATCH 1/4] iov_iter: add copy_to_iter

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Message-ID: <8187c490-b1e1-4c7d-9f7c-590ade4777c4@kernel.dk>
Date: Tue, 9 Apr 2024 11:10:38 -0600
From: Jens Axboe <axboe@...nel.dk>
To: Al Viro <viro@...iv.linux.org.uk>
Cc: linux-fsdevel@...r.kernel.org, brauner@...nel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] iov_iter: add copy_to_iter_full()

On 4/9/24 11:06 AM, Al Viro wrote:
> On Tue, Apr 09, 2024 at 09:22:15AM -0600, Jens Axboe wrote:
>> Add variant of copy_to_iter() that either copies the full amount asked
>> for and return success, or ensures that the iov_iter is back to where
>> it started on failure and returns false.
> 
> FWIW, see git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git #work.iov_iter
> 
> There was an open-coded instance (skb_copy_linear()) that I'd converted to
> that helper in the same commit; I can split it, of course, but I don't
> see much point in that.

No reason to split it, I'll have a dependency regardless. I'll just pull
your branch in, so ignore patch 1 here, 2-4 will remain the same.

-- 
Jens Axboe