Dave Kleikamp <dave.kleikamp@xxxxxxxxxx> writes: > On 04/20/2012 09:48 AM, Maxim V. Patlasov wrote: >> On 03/30/2012 07:43 PM, Dave Kleikamp wrote: >>> From: Zach Brown<zab@xxxxxxxxx> >>> >>> This uses the new kernel aio interface to process loopback IO by >>> submitting concurrent direct aio. Previously loop's IO was serialized >>> by synchronous processing in a thread. >>> >> >> The patch ignores REQ_FLUSH bit of bi_rw. Is it simply overlook? > > Good question. Since the loop device is sending only direct IO requests, > it shouldn't be necessary to explicitly flush page cache, but REQ_FLUSH REQ_FLUSH isn't about the page cache, it's about flushing the volatile disk write cache. You need to handle that. Cheers, Jeff -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
