Hi Dave, On Sat, Feb 14, 2015 at 09:35:07AM +1100, Dave Chinner wrote: > On Fri, Feb 13, 2015 at 11:14:46AM -0200, Carlos Maiolino wrote: > > Hi folks, > > > > I've been seeing a lot of users requesting a shrink feature for XFS, and I > > believe it's time to have it implemented in XFS. > > I'm not so sure about that. > > > Is there anybody working on a shrink feature? If not, I'm going to > > start to work on it, if nobody have any objections. > > > I currently in design discussions with various other developers > about a line of development that will make growing and shrinking XFS > redundant operations. i.e. if we get this right, we'll never need to > deal with capacity changes of XFS filesystems at the XFS level > again. both grow and shrink will be instanteneous, and not require > any modification to the layout of the filesystem at all. > Oh, I had no idea about this discussion :) > Mind you, that's not the reason for that line of development - it's > all about integrated snapshots in XFS. We essentially get > grow/shrink for free with that infrastructure.... > I suppose LSF will be the place for that design discussion. > I'm not quite ready to publish the docco yet - need to get all my > ducks in a line first - but if it does work out as a feasible line > of development, then the old "shrink" method is essentially a dead > end. > > However, don't let that stop you working towards shrink, because > there is infrastructure that it requires that we need for other > things as well. Take you pick: > > - parent pointers > - AG state control > - ranged bulkstat call (e.g. AG range) > - allocation location control from userspace > (which may tie in to AG state control) > - Atomic inode location swaps > > > http://oss.sgi.com/archives/xfs/2014-01/msg00263.html > > But it's worth reading the entire discussion starting here because > it start with a summary of the different approaches taken and why > they were rejected: > > http://oss.sgi.com/archives/xfs/2014-01/msg00224.html > > Cheers, > Yep, I can work on that stuff, thanks for pointing me up the parent inodes discussion. I'll try to show up with something soon. Cheers -- Carlos _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
