From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ming Lei Date: Mon, 26 Nov 2018 10:17:12 +0800 Subject: [Cluster-devel] [PATCH V12 12/20] fs/buffer.c: use bvec iterator to truncate the bio In-Reply-To: <20181126021720.19471-1-ming.lei@redhat.com> References: <20181126021720.19471-1-ming.lei@redhat.com> Message-ID: <20181126021720.19471-13-ming.lei@redhat.com> List-Id: To: cluster-devel.redhat.com MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Once multi-page bvec is enabled, the last bvec may include more than one page, this patch use bvec_last_segment() to truncate the bio. Reviewed-by: Omar Sandoval Reviewed-by: Christoph Hellwig Signed-off-by: Ming Lei --- fs/buffer.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/fs/buffer.c b/fs/buffer.c index 1286c2b95498..fa37ad52e962 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; + + bvec_last_segment(bvec, &bv); + zero_user(bv.bv_page, bv.bv_offset + bv.bv_len, truncated_bytes); } } -- 2.9.5