Messages in this thread | | | Date | Fri, 8 Oct 2010 11:24:27 +0200 | From | Christoph Hellwig <> | Subject | Re: introduce dm-snap-mv |
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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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