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From: Al Viro <viro@ZenIV.linux.org.uk>
To: Christoph Hellwig <hch@infradead.org>
Cc: Goldwyn Rodrigues <rgoldwyn@suse.de>,
	akpm@linux-foundation.org, linux-fsdevel@vger.kernel.org,
	jack@suse.com, linux-block@vger.kernel.org,
	linux-btrfs@vger.kernel.org, linux-ext4@vger.kernel.org,
	linux-xfs@vger.kernel.org, axboe@kernel.dk,
	linux-api@vger.kernel.org, adam.manzanares@wdc.com
Subject: Re: [PATCH 0/10 v11] No wait AIO
Date: Thu, 15 Jun 2017 12:11:58 +0100	[thread overview]
Message-ID: <20170615111157.GL31671@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20170613061431.GA11432@infradead.org>

On Mon, Jun 12, 2017 at 11:14:31PM -0700, Christoph Hellwig wrote:
> On Mon, Jun 12, 2017 at 05:38:13PM -0500, Goldwyn Rodrigues wrote:
> > We had FS_NOWAIT in filesystem type flags (in v3), but retracted it
> > later in v4.
> 
> A per-fs flag is wrong as file_operation may have different
> capabilities.
> 
> > I will work on adding FMODE_AIO_NOWAIT in the meantime.
> 
> If Al prefers that let's go with it for now.  One other thing I'd
> love is a supported flags field in struct file_operations that we
> can compare the flags against.  Al, does that sound good as well?

Which flags are you talking about?  aio ones?  AFAICS, it's the same
kind of thing as "can we lseek?" or "can we read/pread?", etc.
What would that field look like?  Note that some of those might depend
upon the flags passed to open(), so shoving them into file_operations
might mean splitting file_operations instances...  Details, please.

  reply	other threads:[~2017-06-15 11:11 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-06 11:19 Goldwyn Rodrigues
2017-06-06 11:19 ` [PATCH 01/10] fs: Separate out kiocb flags setup based on RWF_* flags Goldwyn Rodrigues
2017-06-06 11:19 ` [PATCH 02/10] fs: Introduce filemap_range_has_page() Goldwyn Rodrigues
2017-06-06 11:19 ` [PATCH 03/10] fs: Use RWF_* flags for AIO operations Goldwyn Rodrigues
2017-06-06 11:19 ` [PATCH 04/10] fs: Introduce RWF_NOWAIT Goldwyn Rodrigues
     [not found]   ` <20170606111939.27272-5-rgoldwyn-l3A5Bk7waGM@public.gmane.org>
2017-06-10  5:27     ` Al Viro
2017-06-06 11:19 ` [PATCH 05/10] fs: return if direct write will trigger writeback Goldwyn Rodrigues
2017-06-06 11:19 ` [PATCH 06/10] fs: Introduce IOMAP_NOWAIT Goldwyn Rodrigues
2017-06-06 11:19 ` [PATCH 07/10] block: return on congested block device Goldwyn Rodrigues
2017-06-06 11:19 ` [PATCH 08/10] ext4: nowait aio support Goldwyn Rodrigues
2017-06-06 11:19 ` [PATCH 09/10] xfs: " Goldwyn Rodrigues
2017-06-06 11:19 ` [PATCH 10/10] btrfs: " Goldwyn Rodrigues
2017-06-08  7:39 ` [PATCH 0/10 v11] No wait AIO Christoph Hellwig
2017-06-10  5:34   ` Al Viro
2017-06-12 22:38     ` Goldwyn Rodrigues
     [not found]       ` <58bbe95e-5a4a-4387-3a00-16ed2e861bd3-l3A5Bk7waGM@public.gmane.org>
2017-06-13  6:14         ` Christoph Hellwig
2017-06-15 11:11           ` Al Viro [this message]
2017-06-15 14:55             ` Christoph Hellwig

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