Ping?
- Ted
On Mon, Jun 06, 2011 at 10:16:30AM -0400, Ted Ts'o wrote:
> On Mon, May 30, 2011 at 05:12:58PM +0200, Jan Kara wrote:
> > /*
> > - * For the unlocked version of this call, also make sure that any
> > - * hanging journal_head is cleaned up if necessary.
> > + * For the unlocked version of this call, also drop buffer_head reference.
> > *
> > * __jbd2_journal_refile_buffer is usually called as part of a single locked
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> Doesn't this paragraph refer to jbd2_journal_refile_buffer(), not
> __jbd2_journal_refile_buffer()? Or am I missing something?
>
> > void jbd2_journal_refile_buffer(journal_t *journal, struct journal_head *jh)
> > {
> > struct buffer_head *bh = jh2bh(jh);
> >
> > + /* Get reference so that buffer cannot be freed before we unlock it */
> > + get_bh(bh);
>
> OK, so we're adding a get_bh(bh) call to jbd2_journal_refile_buffer(),
> which we're not freeing later in the function. So this means every
> single place where we call jbd2_journal_refile_buffer(), we'd better
> add put_bh(bh) or bhrelse(bh) call, right?
>
> So in fs/jbd2/commit.c, line 418, in jbd2_journal_commit_transaction(),
> I see a call to jbd2_journal_refile_buffer(), which the patch doesn't
> seem to adjust. Looks like this could cause a buffer leak?
>
> In your testing, have you checked to the slab cache to make sure there
> isn't any memory leakage going on with buffer heads?
>
> - Ted
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