linux-ext4 - Re: [PATCH 1/2] fs: add FMODE_DIO_PARALLEL

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Date:   Tue, 18 Apr 2023 19:28:26 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Dave Chinner <david@...morbit.com>,
        Bernd Schubert <bschubert@....com>
Cc:     Miklos Szeredi <miklos@...redi.hu>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Christoph Hellwig <hch@...radead.org>,
        "io-uring@...r.kernel.org" <io-uring@...r.kernel.org>,
        "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-xfs@...r.kernel.org" <linux-xfs@...r.kernel.org>,
        Dharmendra Singh <dsingh@....com>
Subject: Re: [PATCH 1/2] fs: add FMODE_DIO_PARALLEL_WRITE flag

On 4/18/23 4:13?PM, Dave Chinner wrote:
>>> Without first attempting to answer those questions, I'd be reluctant
>>> to add  FMODE_DIO_PARALLEL_WRITE to fuse.
> 
> I'd tag it with this anyway - for the majority of apps that are
> doing concurrent DIO within EOF, shared locking is big win. If
> there's a corner case that apps trigger that is slow, deal with them
> when they are reported....

Agree, the common/fast case will be fine, which is really the most
important part.

-- 
Jens Axboe