Jens Axboe <axboe@xxxxxxx> writes: >> Hm. Any buzz^Wkeywords to look for? "barrier" doesn't seem to be the >> right word, it yields only memory barriers and an as-iosched fix in >> 2.6.7. I checked ChangeLog-2.6.[56789]. > > Grep for blk_queue_ordered or similar in the patch. patch-2.6.9 adds this function -- and a call to it to ide-disk.c. Have reiserfs and ext3fs supported this from the very beginning (i. e. 2.6.9) or is this an issue that affected only the lower layers anyhow? /** * blk_queue_ordered - does this queue support ordered writes * @q: the request queue * @flag: see below * * Description: * For journalled file systems, doing ordered writes on a commit * block instead of explicitly doing wait_on_buffer (which is bad * for performance) can be a big win. Block drivers supporting this * feature should call this function and indicate so. * **/ void blk_queue_ordered(request_queue_t *q, int flag) ... -- Matthias Andree - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
