Re: [PATCH RESEND x3 v9 1/9] iov_iter: add copy_struct_from_iter()

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To: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Subject: Re: [PATCH RESEND x3 v9 1/9] iov_iter: add copy_struct_from_iter()
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Thu, 24 Jun 2021 07:41:12 +0100
Cc: Omar Sandoval <osandov@xxxxxxxxxxx>, Al Viro <viro@xxxxxxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Dave Chinner <david@xxxxxxxxxxxxx>, linux-fsdevel <linux-fsdevel@xxxxxxxxxxxxxxx>, linux-btrfs <linux-btrfs@xxxxxxxxxxxxxxx>, Linux API <linux-api@xxxxxxxxxxxxxxx>, Kernel Team <kernel-team@xxxxxx>, Dave Chinner <dchinner@xxxxxxxxxx>
In-reply-to: <YNPnRyasHVq9NF79@casper.infradead.org>

I'm also really worried with overloading the regular r/w path and
iov_iter with ever more special cases.  We already have various
performance problems in the path, and adding more special cases ain't
gonna help.

Follow-Ups:
- Re: [PATCH RESEND x3 v9 1/9] iov_iter: add copy_struct_from_iter()
  - From: Omar Sandoval

References:
- Re: [PATCH RESEND x3 v9 1/9] iov_iter: add copy_struct_from_iter()
  - From: Linus Torvalds
- Re: [PATCH RESEND x3 v9 1/9] iov_iter: add copy_struct_from_iter()
  - From: Omar Sandoval
- Re: [PATCH RESEND x3 v9 1/9] iov_iter: add copy_struct_from_iter()
  - From: Omar Sandoval
- Re: [PATCH RESEND x3 v9 1/9] iov_iter: add copy_struct_from_iter()
  - From: Dave Chinner
- Re: [PATCH RESEND x3 v9 1/9] iov_iter: add copy_struct_from_iter()
  - From: Omar Sandoval
- Re: [PATCH RESEND x3 v9 1/9] iov_iter: add copy_struct_from_iter()
  - From: Al Viro
- Re: [PATCH RESEND x3 v9 1/9] iov_iter: add copy_struct_from_iter()
  - From: Omar Sandoval
- Re: [PATCH RESEND x3 v9 1/9] iov_iter: add copy_struct_from_iter()
  - From: Al Viro
- Re: [PATCH RESEND x3 v9 1/9] iov_iter: add copy_struct_from_iter()
  - From: Omar Sandoval
- Re: [PATCH RESEND x3 v9 1/9] iov_iter: add copy_struct_from_iter()
  - From: Matthew Wilcox

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