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buffer_head size

buffer_head size

Posted Mar 12, 2009 12:54 UTC (Thu) by axboe (subscriber, #904)
Parent article: A superficial introduction to fsblock

Not sure about your description of very small I/O units and buffer_heads. A single buffer_head can map a full page, it's only if you have a 512b file system block size that you get them linked. Which is not a huge surprise, since they represent the on-disk block mapping. But for "normal" 4kb block size file systems, you only get one bh per page.


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