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066da71e7f
1) As implemented the `zpool labelclear` command overwrites the calculated offsets of all four vdev labels even when only a single valid label is found. If the device as been re-purposed but still contains a valid label this can result in space no longer owned by ZFS being zeroed. Prevent this by verifying every label removed is intact before it's overwritten. 2) Address a small bug in zpool_do_labelclear() which prevented labelclear from working on file vdevs. Only block devices support BLKFLSBUF, try the ioctl() but when it's reported as unsupported this should not be fatal. 3) Fix `zpool labelclear` so it can be run on vdevs which were removed from the pool with `zpool remove`. Additionally, allow intact but partial labels to be cleared as in the case of a failed `zpool attach` or `zpool replace`. 4) Remove LABELCLEAR and LABELREAD variables for test cases. Reviewed-by: Matt Ahrens <mahrens@delphix.com> Reviewed-by: Tim Chase <tim@chase2k.com> Reviewed-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #8500 Closes #8373 Closes #6261 |
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