Given that we probably don't have great testing
coverage of devices with the flush capabilities,
Any hints on what type of test coverage ?
Devices used for normal testing, any sort of test basically, that do not
have the flush capabilities will never exercise the in write_dev_flush.
Right. Same with -o nobarrier as well.
So any reference counts or failures will not get covered.
hm. Still I didn't understand your point of view, sorry.
But the contrary is also true that when device cache is enabled,
the write_dev_flush() gets exercised, so we are fine.
I toggled the device write cache manually for testing this set.
# echo "write through" > /sys/block/sdd/queue/write_cache
# echo "write back" > /sys/block/sdd/queue/write_cache
Thanks, Anand
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