linux-kernel - Re: [PATCH] Btrfs: prevent deletion of mounted subvolumes

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Message-ID: <20150402150225.GJ6821@twin.jikos.cz>
Date:	Thu, 2 Apr 2015 17:02:25 +0200
From:	David Sterba <dsterba@...e.cz>
To:	Omar Sandoval <osandov@...ndov.com>
Cc:	David Sterba <dsterba@...e.cz>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Chris Mason <clm@...com>, Josef Bacik <jbacik@...com>,
	Timo Kokkonen <timo.kokkonen@...code.fi>,
	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] Btrfs: prevent deletion of mounted subvolumes

On Wed, Apr 01, 2015 at 08:49:54PM -0700, Omar Sandoval wrote:
> Hm, yeah, that's unfortunate, thanks for pointing that out. It looks
> like we can get the subvolume ID reliably:
> 
> ----
> diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
> index 05fef19..a74ddb3 100644
> --- a/fs/btrfs/super.c
> +++ b/fs/btrfs/super.c
> @@ -1024,6 +1024,8 @@ static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry)
>  	struct btrfs_root *root = info->tree_root;
>  	char *compress_type;
>  
> +	seq_printf(seq, ",subvolid=%llu",
> +		  BTRFS_I(d_inode(dentry))->root->root_key.objectid);

yes, subvolid is reliable, but not very friendly from users' POV. I'd
like to see subvol=/path there. Possibly we can have both.
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