jffs2 statfs issue

["ye janboe" <janboe.ye@gmail.com>]

jffs2 can not return correct free space amount.
I checked jffs2_statfs, there is problem.

	avail = c->dirty_size + c->free_size;
	if (avail > c->sector_size * c->resv_blocks_write)
		avail -= c->sector_size * c->resv_blocks_write;
	else
		avail = 0;

But in jffs2_reserve_space, c->dirty_size will compare to
c->nospc_dirty_size. If dirty < c->nospc_dirty_size, it will return
nospace error.

So I change above code to
	dirty = c->dirty_size + c->erasing_size - c->nr_erasing_blocks *
c->sector_size + c->unchecked_size;
	if (dirty > c->nospc_dirty_size)
		avail = c->dirty_size + c->free_size - c->nospc_dirty_size;
	else
		avail = c->free_size;

Do this make sense?

Thanks a lot!

Janboe
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