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dm flakey: add corrupt_bio_byte feature

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Add corrupt_bio_byte feature to simulate corruption by overwriting a byte at a
specified position with a specified value during intervals when the device is
"down".

Signed-off-by: Mike Snitzer <[email protected]>
Signed-off-by: Alasdair G Kergon <[email protected]>
This commit is contained in:
Mike Snitzer 2011-08-02 12:32:06 +01:00 • committed by Alasdair G Kergon
commit a3998799fb
2 changed files with 159 additions and 15 deletions
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19
Documentation/device-mapper/dm-flakey.txt
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@ -32,3 +32,22 @@ Optional feature parameters:
drop_writes:
All write I/O is silently ignored.
Read I/O is handled correctly.
corrupt_bio_byte <Nth_byte> <direction> <value> <flags>:
During <down interval>, replace <Nth_byte> of the data of
each matching bio with <value>.
<Nth_byte>: The offset of the byte to replace.
Counting starts at 1, to replace the first byte.
<direction>: Either 'r' to corrupt reads or 'w' to corrupt writes.
'w' is incompatible with drop_writes.
<value>: The value (from 0-255) to write.
<flags>: Perform the replacement only if bio->bi_rw has all the
selected flags set.
Examples:
corrupt_bio_byte 32 r 1 0
- replaces the 32nd byte of READ bios with the value 1
corrupt_bio_byte 224 w 0 32
- replaces the 224th byte of REQ_META (=32) bios with the value 0