On Wed, May 03 2006, Oleg Nesterov wrote:
> On 05/03, Jens Axboe wrote:
> >
> > On Wed, May 03 2006, Oleg Nesterov wrote:
> >
> > > However, user_page_pipe_buf_steal() returns unlocked page in
> > > PIPE_BUF_FLAG_GIFT case. So, if add_to_page_cache() fails,
> > > unlock_page() will trigger BUG().
> >
> > It does, it calls generic_pipe_buf_steal() which locks it.
>
> What I have in splice.c:
>
> static int user_page_pipe_buf_steal(struct pipe_inode_info *pipe,
> struct pipe_buffer *buf)
> {
> if (!(buf->flags & PIPE_BUF_FLAG_GIFT))
> return 1;
>
> return 0;
> }
>
> (I don't use git, reading Linus's tree via http).
Ah ok, it got fixed yesterday:
static int user_page_pipe_buf_steal(struct pipe_inode_info *pipe,
struct pipe_buffer *buf)
{
if (!(buf->flags & PIPE_BUF_FLAG_GIFT))
return 1;
return generic_pipe_buf_steal(pipe, buf);
}
> > > ret = mapping->a_ops->prepare_write(file, page, offset, offset+this_len);
> > > if (ret == AOP_TRUNCATED_PAGE) {
> > > page_cache_release(page);
> > > goto find_page;
> > >
> > > We also need to unlock(page) if it was stealed.
> >
> > Are you sure that's the right test? Don't you mean if ret !=
> > AOP_TRUNCATED_PAGE && ret?
> >
> > How about the attached?
>
> Ah, yes, you are right. Sorry for confusion.
Good, I already committed that variant of the fix :)
--
Jens Axboe
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