On Tue, Apr 07, 2009 at 09:32:39PM +0200, Jens Axboe wrote: > > This should be all you need, forget the below. The manual unplugging > only really makes sense for very select situations, since it'll be done > when someone waits on the buffer anyway. Thanks, ok; I missed the "sync_buffer" in the call to wait_on_bit() in __wait_on_buffer(). It also wasn't obvious to me that wait_on_writeback_range() ultimately ends up calling aops->sync_page which for filemap.c will call blk_run_backing_dev() --- and that blk_run_*() results in the right device queue getting unplugged. So this would be a nice thing to get documented in Documentation/biodoc.txt. - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
