On Fri, Sep 26, 2014 at 05:53:52AM +0100, Al Viro wrote:
> On Fri, Sep 26, 2014 at 12:26:17AM -0400, Tejun Heo wrote:
> > On Fri, Sep 26, 2014 at 12:03:25PM +0800, Zefan Li wrote:
> > > This reverts commit 0c7bf3e8cab7900e17ce7f97104c39927d835469.
...
> > > Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
> > > Reported-by: Andrey Wagin <avagin@xxxxxxxxx>
> > > Signed-off-by: Zefan Li <lizefan@xxxxxxxxxx>
> >
> > Applied to cgroup/for-3.18.
>
> Er? It's a clear regression since 3.16; shouldn't it go into mainline
> before 3.17-final? Another thing: AFAICS, if kernfs_fill_super() fails,
Hmmm? This is reverting 0c7bf3e8cab7 which was committed six days ago
to cgroup/for-3.18.
> you get unbalanced kernfs_put() on the cleanup path - kernfs_kill_sb()
> will be called in those cases as well. IOW, we'd better move that
> kernfs_get(info->root->kn);
> in kernfs_fill_super() all way up to the point before kernfs_get_inode().
> Something like this:
>
> Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
> ---
> diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
> index f973ae9..e5e92e3 100644
> --- a/fs/kernfs/mount.c
> +++ b/fs/kernfs/mount.c
> @@ -74,6 +74,7 @@ static int kernfs_fill_super(struct super_block *sb, unsigned long magic)
> sb->s_magic = magic;
> sb->s_op = &kernfs_sops;
> sb->s_time_gran = 1;
> + kernfs_get(info->root->kn);
>
> /* get root inode, initialize and unlock it */
> mutex_lock(&kernfs_mutex);
> @@ -90,7 +91,6 @@ static int kernfs_fill_super(struct super_block *sb, unsigned long magic)
> pr_debug("%s: could not get root dentry!\n", __func__);
> return -ENOMEM;
> }
> - kernfs_get(info->root->kn);
Ooh, right. Will test & send the patch to Greg.
Thanks.
--
tejun
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