CSights wrote:
Hi everyone,
I'm curious what would happen in btrfs if the following commands were
issued:
# cp file1 file2
# chown newuser:newgroup file2
Where file1 was owned by olduser:oldgroup.
If I understand copy-on-write correctly the "cp" would merely create a new
pointer (or whatever it is called :( ) containing the files' metadata but the
file contents would not actually be duplicated.
NO. The concept you describe requires "deduplicate".
What you are forgetting is that "cp" is a user-space program that
reads data and writes it to a new file. The kernel does not see
this as a Copy.
jim
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