On 09/12/2013 11:36 AM, Chris Mason wrote:
Mark Fasheh's offline dedup work is also here. In this case offline
means the FS is mounted and active, but the dedup work is not done
inline during file IO. This is a building block where utilities are
able to ask the FS to dedup a series of extents. The kernel takes
care of verifying the data involved really is the same. Today this
involves reading both extents, but we'll continue to evolve the patches.
Nice feature!
Just a note, the "offline" label is really confusing. In other storage products,
they typically call this "out of band" since you are online but not during the
actual write in a synchronous way :)
Ric
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