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Ming Lei authored
The problem is introduced by commit 764f612c(blk-merge: don't compute bi_phys_segments from bi_vcnt for cloned bio), and merge is needed if number of current segment isn't less than max segments. Strictly speaking, bio->bi_vcnt shouldn't be used here since it may not be accurate in cases of both cloned bio or bio cloned from, but bio_segments() is a bit expensive, and bi_vcnt is still the biggest number, so the approach should work. Signed-off-by:
Ming Lei <tom.leiming@gmail.com> Signed-off-by:
Jens Axboe <axboe@fb.com>
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