Its so quite in hear (maybe because of Ash wednesday?) so I thought I'd break the silence with a few questions. :) I've been reading about the block layer and the scatter gather mechanism which uses an array of bio_vecs in a single bio. My questions are: 1. Can a particular bio vector (segment) span across a page boundary? Or will multiple contiguous pages have their own bio_vecs? So if I have 2 pages in a bio operation, can the i/o request for those 2 pages be represented by a single bio_vec structure? The elements in a bio_vec are page,offset and len, can len be > PAGE_SIZE? 2. The book "Linux Kernel Development" discusses that the representing the bio operation as an array of bio vecs is useful for RAID drivers as the bio can be split. I don't understand how splitting of a bio can help in RAID behavior? the "scatter" in scatter-gather means data scatter across memory. What has this got to do with splitting of data across disks? Thanks! -Joel -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
