Small script to check for bcloned files on a ZFS pool
Important
This script requires a version of zdb that can dump the BRT. See openzfs/zfs#15541
Warning
This script (and zfs as a whole) can only report bcloned files that still have at least two instances (original+copy, two or more copies, ...).
Files were only one instance or less exists could have been bcloned at some point in the past and not be reported.
Note
If you use this script to identify files potentially affected by openzfs/zfs#15526, be aware that the bug has since been reproduced on both 2.2.1 (where bclone is default-disabled) and 2.1.x where bclone did not exist; it seems the corruption bug was preëxisting and only made easier to hit by bclone.
bclonecheck.sh [-C] ZPOOL
Dumps the list of files that have been bcloned. Both the original and copy will be in the list.
Add -C to prevent removal of the created temporary directory, and print its path. Can be useful to see the list of DVAs affected.