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Mohamed Khalfella 58e7c13c8f nvme: add opcode filtering for fault injection
Currently NVMe fault injection applies to every command routed through
nvme_should_fail(), which makes it hard to target a specific command
type when reproducing an issue in error-handling paths.

Add an "opcode" debugfs attribute alongside the existing "status" and
"dont_retry" knobs. It defaults to 0xffff, meaning "match any opcode"
and preserving the previous behavior. When set to a valid opcode
(<= 0xff), fault injection is only considered for commands whose opcode
matches.

Reviewed-by: Christoph Hellwig <[email protected]>
Signed-off-by: Mohamed Khalfella <[email protected]>
Signed-off-by: Keith Busch <[email protected]>
2026-08-19 07:51:23 -07:00
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