diff mbox

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

Message ID 20180525034621.31147-10-ming.lei@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Ming Lei May 25, 2018, 3:45 a.m. UTC 
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(-)
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Patch

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);
 	}
 }