Hello Chris,
> Your database should know, and the ioctl could check to see if the
> source and destination already point to the same thing before doing
> anything expensive.
I see.
> > So, if I only have file, offset, len and not the block number, is there
> > a way from userland to tell if two blocks are already point to the same
> > block?
> You can use the fiemap ioctl.
I see.
One more question, in my dedup test VMs, I had a block that was often
referenced these are the top block. The last one alone saves 3 Gbyte of
data. My question is now, how often can a block in btrfs be refferenced?
top 4 block counts for 8 Kbyte:
32055
59514
63606
415252
Thomas
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