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-=========
-dm-flakey
-=========
-
-This target is the same as the linear target except that it exhibits
-unreliable behaviour periodically.  It's been found useful in simulating
-failing devices for testing purposes.
-
-Starting from the time the table is loaded, the device is available for
-<up interval> seconds, then exhibits unreliable behaviour for <down
-interval> seconds, and then this cycle repeats.
-
-Also, consider using this in combination with the dm-delay target too,
-which can delay reads and writes and/or send them to different
-underlying devices.
-
-Table parameters
-----------------
-
-::
-
-  <dev path> <offset> <up interval> <down interval> \
-    [<num_features> [<feature arguments>]]
-
-Mandatory parameters:
-
-    <dev path>:
-        Full pathname to the underlying block-device, or a
-        "major:minor" device-number.
-    <offset>:
-        Starting sector within the device.
-    <up interval>:
-        Number of seconds device is available.
-    <down interval>:
-        Number of seconds device returns errors.
-
-Optional feature parameters:
-
-  If no feature parameters are present, during the periods of
-  unreliability, all I/O returns errors.
-
-  drop_writes:
-	All write I/O is silently ignored.
-	Read I/O is handled correctly.
-
-  error_writes:
-	All write I/O is failed with an error signalled.
-	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_opf has all the
-	selected flags set.
-
-Examples:
-
-Replaces the 32nd byte of READ bios with the value 1::
-
-  corrupt_bio_byte 32 r 1 0
-
-Replaces the 224th byte of REQ_META (=32) bios with the value 0::
-
-  corrupt_bio_byte 224 w 0 32