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block: null_blk: make fault-injection dynamically configurable per device

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The null_blk driver has multiple driver-specific fault injection
mechanisms.  Each fault injection configuration can only be specified by a
module parameter and cannot be reconfigured without reloading the driver.
Also, each configuration is common to all devices and is initialized every
time a new device is added.

This change adds the following subdirectories for each null_blk device.

/sys/kernel/config/nullb/<disk>/timeout_inject
/sys/kernel/config/nullb/<disk>/requeue_inject
/sys/kernel/config/nullb/<disk>/init_hctx_fault_inject

Each fault injection attribute can be dynamically set per device by a
corresponding file in these directories.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Link: https://lore.kernel.org/r/20230327143733.14599-3-akinobu.mita@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Akinobu Mita
2023-03-27 23:37:33 +09:00
committed by Jens Axboe
parent 4668c7a294
commit bb4c19e030
4 changed files with 87 additions and 23 deletions
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8
Documentation/fault-injection/fault-injection.rst
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@@ -52,6 +52,14 @@ Available fault injection capabilities
status code is NVME_SC_INVALID_OPCODE with no retry. The status code and
retry flag can be set via the debugfs.
- Null test block driver fault injection
inject IO timeouts by setting config items under
/sys/kernel/config/nullb/<disk>/timeout_inject,
inject requeue requests by setting config items under
/sys/kernel/config/nullb/<disk>/requeue_inject, and
inject init_hctx() errors by setting config items under
/sys/kernel/config/nullb/<disk>/init_hctx_fault_inject.
Configure fault-injection capabilities behavior
-----------------------------------------------