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H A Drbd.c3a482501 Thu Feb 28 03:49:12 CST 2019 Ilya Dryomov <idryomov@gmail.com> rbd: introduce rbd_obj_issue_copyup_ops()

In preparation for deep-flatten feature, split rbd_obj_issue_copyup()
into two functions and add a new write state to make the state machine
slightly more clear. Make the copyup op optional and start using that
for when the overlap goes to 0.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
3a482501 Thu Feb 28 03:49:12 CST 2019 Ilya Dryomov <idryomov@gmail.com> rbd: introduce rbd_obj_issue_copyup_ops()

In preparation for deep-flatten feature, split rbd_obj_issue_copyup()
into two functions and add a new write state to make the state machine
slightly more clear. Make the copyup op optional and start using that
for when the overlap goes to 0.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>