linux-kernel - Re: [PATCH 2/3] uapi: get rid of STATX

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Date:   Thu, 18 Oct 2018 19:45:42 -0600
From:   Andreas Dilger <adilger@...ger.ca>
To:     Florian Weimer <fw@...eb.enyo.de>
Cc:     Miklos Szeredi <mszeredi@...hat.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-api@...r.kernel.org, David Howells <dhowells@...hat.com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Amir Goldstein <amir73il@...il.com>
Subject: Re: [PATCH 2/3] uapi: get rid of STATX_ALL


> On Oct 18, 2018, at 7:15 AM, Florian Weimer <fw@...eb.enyo.de> wrote:
> 
> * Miklos Szeredi:
> 
>> #define STATX__RESERVED		0x80000000U	/* Reserved for future struct statx expansion */
> 
> What about this?  Isn't it similar to STATX_ALL in the sense that we
> don't know yet what it will mean?

No, this means that this last bit will be used for increasing the size of the
stx_mask field at some point in the future.  IMHO, this is present as a reminder
to any developer who is adding fields in the future not to use the last flag.

Cheers, Andreas






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