Commit f70f4464 authored Feb 15, 2019 by Ming Lei Committed by Jens Axboe Feb 15, 2019

fs/buffer.c: use bvec iterator to truncate the bio



Once multi-page bvec is enabled, the last bvec may include more than one
page, this patch use mp_bvec_last_segment() to truncate the bio.

Reviewed-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

parent 45a3fb95

fs/buffer.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -3032,7 +3032,10 @@ void guard_bio_eod(int op, struct bio *bio)

		/* ..and clear the end of the buffer for reads */
		if (op == REQ_OP_READ) {
		zero_user(bvec->bv_page, bvec->bv_offset + bvec->bv_len,
		struct bio_vec bv;

		mp_bvec_last_segment(bvec, &bv);
		zero_user(bv.bv_page, bv.bv_offset + bv.bv_len,
		truncated_bytes);
		}
		}