I'm reading the source code about ZFS trying to know some details about COW
mechanism.
And I've known some related data structures such as dnode_phys_t,
blkptr_t, uberblock_phys_t,objset_phys_t,dnode_t,dmu_buf_impl_t,etc.
but I can't find the codes about allocating a new block, copying the
modified one to it, and then recursively changing the direckblocks.Where can I
find such codes?
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