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 <[email protected]> Reviewed-by: Christoph Hellwig <[email protected]> Signed-off-by: Ming Lei <[email protected]> --- fs/buffer.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/fs/buffer.c b/fs/buffer.c index 52d024bfdbc1..817871274c77 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -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); } } -- 2.9.5 -- dm-devel mailing list [email protected] https://www.redhat.com/mailman/listinfo/dm-devel
