Jens Axboe <jens.axboe@xxxxxxxxxx> writes: > But we don't already have this problem, that is the point. For page > cache writes, the page cache nicely solves this issue for us - a write > that comes in later gets to wait on the page lock before proceeding. So > at least it's ordered. For O_DIRECT, the issuer is on his own. > > I think this is a serious problem and that we must ensure that an > overlapping write doesn't pass a previously issued discard request. So > in that sense, discards must be considered soft barriers. Um.., if blocks used by data (page cache) is reused as directory (meta data), it can happen? -- OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx> -- 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
