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>> unsigned int length; >> >> length = min(max_segments, 2) * lim->logical_block_size; >> if (max_segments > 2) >> length += (max_segments - 2) * min(PAGE_SIZE, lim->max_segment_size); >> >> return length; >> } >> >> Note that blk_queue_max_guaranteed_bio() is only really relevant to dio, so >> assumes that the iov_iter follows the bdev dio rules > It can't work because ITER_UBUF from pwritev2(iovcnt=1) is virtually-contiguous, Right > and the middle segment size has to be PAGE_SIZE. I would have thought that those PAGE_SIZE-sized middle iovecs should be split into multiple segments, no? Thanks, John