Re: [BLOCK] bh: Ensure bh fits within a page

From: Herbert Xu
Date: Tue Aug 01 2006 - 01:00:53 EST

On Mon, Jul 31, 2006 at 09:04:18PM -0700, Andrew Morton wrote:
> Could we have a more detailed description?

Sure, this particular instance is in journal_write_metadata_buffer
where the bh may be constructed from kmalloc memory (search for the
call to jbd_rep_kmalloc). Because the memory returned by kmalloc
may straddle a page (when slab debugging is enabled that is), this
causes a broken bh to be injected into submit_bh.

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