[dm-devel] introduce dm-snap-mv
Christoph Hellwig
hch at lst.de
Fri Oct 8 09:24:27 UTC 2010
On Fri, Oct 08, 2010 at 05:14:27PM +0800, McPacino wrote:
> Hi Christoph,
>
> I have to take care the cache problem If using the bio directly.
> BHs can be released by kernel when necessary.
>
> Is there any existing code using bio to read/write metadata
> blocks? How do they handle the timing freeing bios? I really
> wish to learn something form it.
If you actually need caching just use the pagecache, e.g.
read_mapping_page to read in your data. That completely abstracts
away the underlying block size.
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