On 1/31/18 11:13 AM, Jerome Glisse wrote: > That's one solution, another one is to have struct bio_vec store > buffer_head pointer and not page pointer, from buffer_head you can > find struct page and using buffer_head and struct page pointer you > can walk the KSM rmap_item chain to find back the mapping. This > would be needed on I/O error for pending writeback of a newly write > protected page, so one can argue that the overhead of the chain lookup > to find back the mapping against which to report IO error, is an > acceptable cost. Ehm nope. bio_vec is a generic container for pages, requiring buffer_heads to be able to do IO would be insanity. -- Jens Axboe -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
