unarchive 7420 tag 7420 notabug close 7420 stop On 17/11/10 10:19, Марк Коренберг wrote: > [Feature request]: add option to dd to fsync|fdatasync after each block > written > > Suppose I want to show progress with: > > pv image.img | dd bs=16M of=/dev/sdc > > it will not work, as dd will write to sdc momentarily. dd will hang on > close(1) waiting for actual write to complete (tested on USB stick > Linux 2.6.32) > > I decide to use oflag=direct. It help, OK. But: > http://kerneltrap.org/node/7563 > > It will be nice if, dd will be able to fsync/fdatasync after each block. > > I think, it is useful for other usages.
This is useful. However supporting functionality was added to the next kernel version 2.6.33 Or rather O_SYNC ad O_DSYNC were properly distinguished: http://lwn.net/Articles/350225/ Both options were available to through dd long before that. In summary dd oflag=dsync should now do exactly as you expect. thanks, Pádraig.
