[PATCH V5 09/33] fs/buffer.c: use bvec iterator to truncate the bio

Ming Lei
2018-05-24T09:01:14Z

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

Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
fs/buffer.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/buffer.c b/fs/buffer.c
index 249b83fafe48..da4b19f7b67b 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -3021,7 +3021,10 @@ 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;
+
+ segment_last_page(bvec, &bv);
+ zero_user(bv.bv_page, bv.bv_offset + bv.bv_len,
truncated_bytes);
}
}
--
2.9.5