linux-kernel - Re: [PATCH -V14 0/11] Generic name to handle and open by handle syscalls

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Date:	Thu, 08 Jul 2010 13:52:29 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	"Aneesh Kumar K. V" <aneesh.kumar@...ux.vnet.ibm.com>
CC:	neilb@...e.de, bfields@...ldses.org, miklos@...redi.hu,
	david@...morbit.com, hch@...radead.org, viro@...iv.linux.org.uk,
	adilger@....com, corbet@....net, serue@...ibm.com,
	hooanon05@...oo.co.jp, linux-fsdevel@...r.kernel.org,
	sfrench@...ibm.com, philippe.deniel@....FR,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -V14 0/11] Generic name to handle and open by handle syscalls

On Thu, 08 Jul 2010, Aneesh Kumar K. V wrote:
> How about adding mnt_id to the handle ? Documentation file says it is
> unique 
> 
> (1) mount ID:  unique identifier of the mount (may be reused after umount)
> 
> I also updated (/proc/self/mountinfo) to carry the optional uuid field
> With the below patch i get  in /proc/self/mountinfo
> 
> 13 1 253:0 / / rw,relatime,uuid:9b5af62a-a34a-43f6-a5bb-1cc22d97e862 - ext3 /dev/root rw,errors=continue,barrier=0,data=writeback
> 
> And the handle returns the value 13 in mnt_id field. We should able to
> lookup mountinfo with mnt_id and find the corresponding uuid.
> 
> diff --git a/fs/namespace.c b/fs/namespace.c
> index 88058de..498bd9a 100644
> --- a/fs/namespace.c
> +++ b/fs/namespace.c
> @@ -871,6 +871,9 @@ static int show_mountinfo(struct seq_file *m, void *v)
>  	if (IS_MNT_UNBINDABLE(mnt))
>  		seq_puts(m, " unbindable");
>  
> +	/* print the uuid */
> +	seq_printf(m, ",uuid:%pU", mnt->mnt_sb->s_uuid);
> +

This should be

	seq_printf(m, " uuid:%pU", mnt->mnt_sb->s_uuid);

Thanks,
Miklos
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