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zinject: "no-op" error injection

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When injected, this causes the matching IO to appear to succeed, but the
actual work is never submitted to the physical device. This can be used
to simulate a write-back cache servicing a write, but the backing device
has failed and the cache cannot complete the operation in the
background.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Closes #16085
This commit is contained in:
Rob N
2024-04-16 06:52:20 +10:00
committed by GitHub
parent f22b110f60
commit 4725e543be
4 changed files with 19 additions and 6 deletions
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man/man8/zinject.8
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@@ -211,9 +211,11 @@ to flip a bit in the data after a read,
.It Sy dtl
for an ECHILD error,
.It Sy io
for an EIO error where reopening the device will succeed, or
for an EIO error where reopening the device will succeed,
.It Sy nxio
for an ENXIO error where reopening the device will fail.
for an ENXIO error where reopening the device will fail, or
.It Sy noop
to drop the IO without executing it, and return success.
.El
.Pp
For EIO and ENXIO, the "failed" reads or writes still occur.