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    SubjectRe: [PATCH] Btrfs: prevent deletion of mounted subvolumes
    On Wed, Apr 01, 2015 at 12:03:28AM -0700, Omar Sandoval wrote:
    > --- a/fs/btrfs/super.c
    > +++ b/fs/btrfs/super.c
    > @@ -1024,6 +1024,10 @@ static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry)
    > struct btrfs_root *root = info->tree_root;
    > char *compress_type;
    >
    > + if (dentry != dentry->d_sb->s_root) {
    > + seq_puts(seq, ",subvol=");
    > + seq_dentry(seq, dentry, " \t\n\\");

    Unfortunatelly this does not work if the default subvolume is not the
    toplevel one and the implicit mount (ie. without subvol=) is used. Then
    this leads to subvol=/ although it should be subvol=/the/default .

    There was a patch to build the path in the show_options callback, but it
    looked too heavy (taking locks, doing lookups). This is unrelated to the
    problem reported by Timo, though the fix might also fix this one.


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