[PATCH] [JFFS2] Fix free space leaking

[Jörn Engel]

On Wed, 6 February 2008 11:20:19 +0100, Joakim Tjernlund wrote:
> On Tue, 2007-11-13 at 13:23 +0300, Damir Shayhutdinov wrote:
> > This patch is addressed to fix very-long-standing problem in JFFS2,
> > first described in 2004:
> > http://lists.infradead.org/pipermail/linux-mtd/2004-March/009456.html
> > 
> > jffs2_link_node_ref() decreases c->free_size by
> > c->cleanmarker_size but the clean marker space can't
> > be accounted as free space! So we just compensate
> > the difference.
> > 
> > Signed-off-by: Alexander Yurchenko <grange at tecon.ru>
> > Signed-off-by: Damir Shayhutdinov <damir at tecon.ru>
> > ---
> >  fs/jffs2/erase.c |   11 +++++++++++
> >  1 files changed, 11 insertions(+), 0 deletions(-)
> > 
> > diff --git a/fs/jffs2/erase.c b/fs/jffs2/erase.c
> > index a1db918..c574fa3 100644
> > --- a/fs/jffs2/erase.c
> > +++ b/fs/jffs2/erase.c
> > @@ -454,6 +454,17 @@ static void jffs2_mark_erased_block(struct jffs2_sb_info *c, struct jffs2_eraseb
> >  		jeb->free_size = c->sector_size;
> >  		/* FIXME Special case for cleanmarker in empty block */
> >  		jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL, c->cleanmarker_size, NULL);
> > +		/*
> > +		 * XXX: I'm not sure this is correct but it prevents
> > +		 * c->free_size from slow leaking under a frequent file
> > +		 * overwriting.
> > +		 * jffs2_link_node_ref() decreases c->free_size by
> > +		 * c->cleanmarker_size but the clean marker space can't
> > +		 * be accounted as free space! So we just compensate
> > +		 * the difference.
> > +		 */
> > +		c->free_size += c->cleanmarker_size;
> > +		c->used_size -= c->cleanmarker_size;
> >  	}
> >  
> >  	down(&c->erase_free_sem);
> 
> What happened to this patch? Just forgotten or was it rejected?

No idea, but it might help to add dwmw2 to Cc:.

Jörn

-- 
Joern's library part 4:
http://www.paulgraham.com/spam.html