On Thu, 08 Jul 2010 22:48:13 -0700 Joe Eykholt <jeykholt at cisco.com> wrote: > > When scsi_tgt_cmd_done calls scsi_unmap_user_pages (via queue_work), > > we start to commit dirty pages to disk; __bio_unmap_user set pages > > dirty. When the dirty bit of all the pages is cleared, the data is > > committed safely. LLDs could check it, I think. If the write cache of > > backing store is enabled, we more tricks though. > > Would that work for all backing store alternatives or just the > default of writing to a file via mmap? Tgt kernel drivers can support only I/O via mmap. Otherwise, we need to copy data between user and kernel space. We could add an explicit message but we should try hard to avoid it. I really want to investigate this before adding another message. -- To unsubscribe from this list: send the line "unsubscribe stgt" in the body of a message to majordomo at vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html |