linux-kernel - Re: [PATCH v2 05/10] fs/ntfs3: Add attrib operations

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Date:   Mon, 24 Aug 2020 17:14:15 +0100
From:   Mark Harmstone <mark@...mstone.com>
To:     Konstantin Komarov <almaz.alexandrovich@...agon-software.com>,
        "viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Cc:     Pali Rohár <pali@...nel.org>
Subject: Re: [PATCH v2 05/10] fs/ntfs3: Add attrib operations

Hi Konstantin,

I have an interest in this - I wrote the Btrfs driver for Windows, which also had to deal with the issue of how to map NTFS concept to Linux xattrs. Unless there's a good reason, I think it'd be in everyone's interests if we used the same conventions.

You have four(!) different ways of referring to the attributes value, which seems a bit excessive. I suggest you just use user.DOSATTRIB - this should be in the user namespace as users can set e.g. the hidden flag on files at will. This also matches what my driver does, and what Samba does.

I also think it's a mistake to only expose user.DOSATTRIB to Samba - there's patches in Wine staging which would also benefit from this.

Also, unless I'm missing something there's a bug in ntfs_setxattr - the user shouldn't be able to clear the FILE_ATTRIBUTE_DIRECTORY flag on directories nor set it on files.

Thanks

Mark