Re: [PATCH vfs.tmpfs 4/5] tmpfs: trivial support for direct IO

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To: Hugh Dickins <hughd@xxxxxxxxxx>
Subject: Re: [PATCH vfs.tmpfs 4/5] tmpfs: trivial support for direct IO
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Fri, 11 Aug 2023 01:34:28 -0700
Cc: "Darrick J. Wong" <djwong@xxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Christian Brauner <brauner@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Oleksandr Tymoshenko <ovt@xxxxxxxxxx>, Carlos Maiolino <cem@xxxxxxxxxx>, Jeff Layton <jlayton@xxxxxxxxxx>, Chuck Lever <chuck.lever@xxxxxxxxxx>, Jan Kara <jack@xxxxxxx>, Miklos Szeredi <miklos@xxxxxxxxxx>, Daniel Xu <dxu@xxxxxxxxx>, Chris Down <chris@xxxxxxxxxxxxxx>, Tejun Heo <tj@xxxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, Pete Zaitcev <zaitcev@xxxxxxxxxx>, Helge Deller <deller@xxxxxx>, Topi Miettinen <toiwoton@xxxxxxxxx>, Yu Kuai <yukuai3@xxxxxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx
In-reply-to: <5d913a4-a118-1218-25f2-32709b3e618@google.com>
References: <e92a4d33-f97-7c84-95ad-4fed8e84608c@google.com> <7c12819-9b94-d56-ff88-35623aa34180@google.com> <ZNOXfanlsgTrAsny@infradead.org> <20230810234124.GH11336@frogsfrogsfrogs> <5d913a4-a118-1218-25f2-32709b3e618@google.com>

On Thu, Aug 10, 2023 at 11:16:20PM -0700, Hugh Dickins wrote:
> Helpful support, thanks.  But I didn't read Christoph as unhappy with
> the granularity issue: just giving me directIOn to FMODE_CAN_ODIRECT,
> and rightly wondering why we ever fail O_DIRECTs.

Exactly.

References:
- [PATCH vfs.tmpfs 0/5] tmpfs: user xattrs and direct IO
  - From: Hugh Dickins
- [PATCH vfs.tmpfs 4/5] tmpfs: trivial support for direct IO
  - From: Hugh Dickins
- Re: [PATCH vfs.tmpfs 4/5] tmpfs: trivial support for direct IO
  - From: Christoph Hellwig
- Re: [PATCH vfs.tmpfs 4/5] tmpfs: trivial support for direct IO
  - From: Darrick J. Wong
- Re: [PATCH vfs.tmpfs 4/5] tmpfs: trivial support for direct IO
  - From: Hugh Dickins

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