On Friday 08 October 2010, Christoph Hellwig wrote: > 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. And that will automatically give him the PAGE_CACHE_SIZE objects he wants. I still don't understand why his model cannot be generalized to arbitrary block size specifiable at create time. Regards, Daniel -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
