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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>
hifive-unleashed-5.1
Ming Lei 2019-02-15 19:13:15 +08:00 committed by Jens Axboe
parent 45a3fb9529
commit f70f446407
1 changed files with 4 additions and 1 deletions
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5
fs/buffer.c
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@ -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);
}
}