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Date:   Wed, 12 Jan 2022 22:30:57 -0800
From:   Jeremy Allison <jra@samba.org>
To:     Amir Goldstein <amir73il@gmail.com>
Cc:     "Darrick J. Wong" <djwong@kernel.org>,
        Christoph Hellwig <hch@infradead.org>,
        Trond Myklebust <trond.myklebust@hammerspace.com>,
        Dan Carpenter <dan.carpenter@oracle.com>,
        richard.sharpe@primarydata.com,
        Linux NFS Mailing List <linux-nfs@vger.kernel.org>,
        lance.shelton@hammerspace.com,
        Anna Schumaker <Anna.Schumaker@netapp.com>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        Linux API <linux-api@vger.kernel.org>,
        CIFS <linux-cifs@vger.kernel.org>, ntfs3@lists.linux.dev,
        Steve French <sfrench@samba.org>,
        Konstantin Komarov <almaz.alexandrovich@paragon-software.com>,
        Ralph Boehme <slow@samba.org>
Subject: Re: [bug report] NFS: Support statx_get and statx_set ioctls
Message-ID: <Yd/HIYsCBPH5jPmS@jeremy-acer>
Reply-To: Jeremy Allison <jra@samba.org>
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On Thu, Jan 13, 2022 at 05:52:40AM +0200, Amir Goldstein wrote:
>
>To add one more terminology to the mix - when Samba needed to cope
>with these two terminologies they came up with itime for "instantiation time"
>(one may also consider it "immutable time").

No, that's not what itime is. It's used as the basis
for the fileid return as MacOSX clients insist on no-reuse
of inode numbers when a file is deleted then re-created,
and ext4 will re-use the same inode.

Samba uses btime for "birth time", and will use statx
to get it from the filesystem but then store it in
the dos.attribute EA so it can be modified if the
client sets it.