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Martin K. Petersen
f3f5da624e
This fixes a data corruption bug when using discard on top of MD linear,
raid0 and raid10 personalities.
Commit 20d0189b10 "block: Introduce new bio_split()" permits sharing
the bio_vec between the two resulting bios. That is fine for read/write
requests where the bio_vec is immutable. For discards, however, we need
to be able to attach a payload and update the bio_vec so the page can
get mapped to a scatterlist entry. Therefore the bio_vec can not be
shared when splitting discards and we must do a full clone.
Signed-off-by: Martin K. Petersen <[email protected]>
Reported-by: Seunguk Shin <[email protected]>
Tested-by: Seunguk Shin <[email protected]>
Cc: Seunguk Shin <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Kent Overstreet <[email protected]>
Cc: <[email protected]> # v3.14+
Reviewed-by: Christoph Hellwig <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>