On Fri, Nov 09, 2012 at 03:03:21PM +0000, Roger Willcocks wrote: > > > > My question is, how can I guarantee the file system blocks over files > > > continuous? Thanks for your time and appreciate your answer. > > > > You can't, directly. > > We needed to do this so I added code to swapext to support transferring > leading blocks from one (preallocated single extent) file to another > empty file. It's pretty straightforward but perhaps too special case for > general consumption. Please post the patch - swapping arbitrary ranges between two inodes is something that is definitely useful. It is needed, for example, to do directory defragmentation, and I know that non-linear video editting apps would love ioctls to do similar things within the same file (e.g. punching ads out of a video stream without having to copy data around at all). That's a note for anyone that has implemented stuff like this - regardless of whether you think it is useful or not, having the patches out in the open (not matter what the state of the code) makes it 100x more valuable than keeping it to yourself, and it allows people to build functionality off them rather than having to re-invent the wheel. And, of course, there is the possibility we add the functionality to the main tree, and you no longer have to maintain and test it yourself.... :) Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
