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3c80e0742a
Verify that all empty sectors are zero filled before using them to calculate parity. Failure to do so can result in incorrect parity columns being generated and written to disk if the contents of an empty sector are non-zero. This was possible because the checksum only protects the data portions of the buffer, not the empty sector padding. This issue has been addressed by updating raidz_parity_verify() to check that all dRAID empty sectors are zero filled. Any sectors which are non-zero will be fixed, repair IO issued, and a checksum error logged. They can then be safely used to verify the parity. This specific type of damage is unlikely to occur since it requires a disk to have silently returned bad data, for an empty sector, while performing a scrub. However, if a pool were to have been damaged in this way, scrubbing the pool with this change applied will repair both the empty sector and parity columns as long as the data checksum is valid. Checksum errors will be reported in the `zpool status` output for any repairs which are made. Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Mark Maybee <mark.maybee@delphix.com> Reviewed-by: Brian Atkinson <batkinson@lanl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #12857 |
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