On Fri, Mar 14, 2014 at 11:20 PM, Tejun Heo <tj@xxxxxxxxxx> wrote: > On Fri, Mar 14, 2014 at 11:17:56PM +0900, Roman Peniaev wrote: >> No, no. Not device does not support flush, filesystem does not care about flush. >> (take any old school, e.g. ext2) >> >> We did some write, and then we did fsync. >> But filesystem does not support REQ_FLUSH/FUA so block device will never >> get the checkpoint where it should really flush everything. >> >> So, fsync will not guarantee any integrity in that case. > > Oh, no idea. Fix the filesystem to support REQ_FLUSH? :) Yep, best variant. But I was thinking that there should be some guarantees from fsync (and friends) calls, which will issue flush after completion of every writeback request. But no way > > -- > tejun -- 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