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authorChunwei Chen <[email protected]>2017-01-19 13:56:36 -0800
committerBrian Behlendorf <[email protected]>2017-01-19 13:56:36 -0800
commit040dab993936d832df4c7624bbcdb71c3fb9b34b (patch)
tree0261aedba3c5e6fdda94a0a10388d065f0802924 /zfs.release.in
parent76fe529b392068dfb7575739542cd4f69d2d4343 (diff)
Suspend/resume zvol for recv and rollback
When doing recv and rollback, dsl_dataset_clone_swap_sync_impl will be called to swap out the ds_objset and do dmu_objset_evict on the old one. However, currently zv->zv_objset will not be swapped out accordingly, so if anyone currently holds a fd on the zvol, we risk hitting a use-after-free. We fix this by introducing the suspend and resume mechanism of zsb to zv. Before recv or rollback, we use zvol_suspend to block all access to zv_objset and shut it down. After the recv or rollback, we use zvol_resume to swap in zv_objset with the new ds_objset and unblock the access. Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Chunwei Chen <[email protected]> Closes #4866 Closes #5609
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