illumos gate

zfs receive -F does not respect the destinations canmount properties if it has to destroy/rollback some destinations child datasets.

in this case a second "plain" zfs receive WILL always fail if the source datasets ARE mounted.

it looks like that zfs receive -F will mount datasets (even if their canmount is inherited to off) before it destroys them.

see the attached file for a test script and result matrix. the result matrix was taken on oi151a. but the test script seems to behave the same on omnios-33fdde4 .

zfs receive -F should always behave the same, regardless if it has to destroy/rollback datasets. it also should respect the actual (inherited) canmount settings.