Re: [PATCH 04/12] gfs2: properly initial file_lock used for unlock.

Jeff Layton
2018-11-05T12:19:02Z

On Mon, 2018-11-05 at 12:30 +1100, NeilBrown wrote:
> Rather than assuming all-zeros is sufficient, use the available API to
> initialize the file_lock structure use for unlock.
> VFS-level changes will soon make it important that the
> list_heads in file_lock are always properly initialized.
>
> Signed-off-by: NeilBrown <neilb@suse.com>
> ---
> fs/gfs2/file.c | 10 +++++-----
> 1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
> index 45a17b770d97..271f847705e3 100644
> --- a/fs/gfs2/file.c
> +++ b/fs/gfs2/file.c
> @@ -1199,13 +1199,13 @@ static int do_flock(struct file *file, int cmd, struct file_lock *fl)
> mutex_lock(&fp->f_fl_mutex);
>
> if (gfs2_holder_initialized(fl_gh)) {
> + struct file_lock request;
> if (fl_gh->gh_state == state)
> goto out;
> - locks_lock_file_wait(file,
> - &(struct file_lock) {
> - .fl_type = F_UNLCK,
> - .fl_flags = FL_FLOCK
> - });
> + locks_init_lock(&request);
> + request.fl_type = F_UNLOCK;

F_UNLCK ?

The ocfs2 patch has the same bug.

> + request.fl_flags = FL_FLOCK;
> + locks_lock_file_wait(file, &request);
> gfs2_glock_dq(fl_gh);
> gfs2_holder_reinit(state, flags, fl_gh);
> } else {
>
>

--
Jeff Layton <jlayton@kernel.org>