linux-kernel - Re: [PATCH 2/2] statx: move STATX_ATTR_DAX attribute handling to filesystems

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Message-ID: <300456.1606856642@warthog.procyon.org.uk>
Date:   Tue, 01 Dec 2020 21:04:02 +0000
From:   David Howells <dhowells@...hat.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     dhowells@...hat.com, Eric Sandeen <sandeen@...hat.com>,
        Miklos Szeredi <mszeredi@...hat.com>,
        Ira Weiny <ira.weiny@...el.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-man <linux-man@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        xfs <linux-xfs@...r.kernel.org>,
        Ext4 Developers List <linux-ext4@...r.kernel.org>,
        Xiaoli Feng <xifeng@...hat.com>
Subject: Re: [PATCH 2/2] statx: move STATX_ATTR_DAX attribute handling to filesystems

Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> And if IS_DAX() is correct, then why shouldn't this just be done in
> generic code? Why move it to every individual filesystem?

One way of looking at it is that the check is then done for every filesystem -
most of which don't support it.  Not sure whether that's a big enough problem
to worry about.  The same is true of the automount test too, I suppose...

David