On 11/01/2012 10:43 PM, Chris Mason wrote:

On Sat, Oct 27, 2012 at 04:28:41AM -0600, Liu Bo wrote:

quoted

This feature works on our crucial write endio path, so if we've got
lots of fragments to process, it will be kind of a disaster to the
performance, so I make such a change.

One can benifit from it while mounting with '-o snap_aware_defrag'.

I think we should always prefer to maintain snapshot cloning as much as
possible, and have a specific option to defrag that makes it break the
clone in favor of removing fragmentation.

Oh yeah, so I was considering the existing btrfs partitions who have already
broke the cloning relationship.

So, please keep the snapshot aware defrag the default ;)

All right, that'd be nice, just drop this patch.

thanks,
liubo

Thanks for taking these patches up again!

-chris
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