linux-kernel - Re: [Virtio-fs] [PATCH 3/2] fs: simplify get_filesystem_list / get_all_fs

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Message-ID: <20210630053601.GA29241@lst.de>
Date:   Wed, 30 Jun 2021 07:36:01 +0200
From:   Christoph Hellwig <hch@....de>
To:     Vivek Goyal <vgoyal@...hat.com>
Cc:     Stefan Hajnoczi <stefanha@...hat.com>,
        Christoph Hellwig <hch@....de>, viro@...iv.linux.org.uk,
        linux-fsdevel@...r.kernel.org, virtio-fs@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [Virtio-fs] [PATCH 3/2] fs: simplify get_filesystem_list /
 get_all_fs_names

On Tue, Jun 29, 2021 at 04:50:48PM -0400, Vivek Goyal wrote:
> May be we should modify mount_block_root() code so that it does not
> require that extra "\0". Possibly zero initialize page and that should
> make sure list_bdev_fs_names() does not have to worry about it.
> 
> It is possible that a page gets full from the list of filesystems, and
> last byte on page is terminating null. In that case just zeroing page
> will not help. We can keep track of some sort of end pointer and make
> sure we are not searching beyond that for valid filesystem types.
> 
> end = page + PAGE_SIZE - 1;
> 
> mount_block_root()
> {
> 	for (p = fs_names; p < end && *p; p += strlen(p)+1) {
> 	}
> }

Maybe.  To honest I'd prefer to not even touch this unrelated code given
how full of landmines it is :)