From 27d7c2a006a81c04fab00b8cd81b99af3b32738d Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Wed, 5 Dec 2012 20:01:24 +0300
Subject: [PATCH] vfs: clear to the end of the buffer on partial buffer reads
READ is zero so the "rw & READ" test is always false. The intended test
was "((rw & RW_MASK) == READ)".
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
fs/buffer.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/buffer.c b/fs/buffer.c
index c4e11390a44c..ec0aca8ba6bf 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2935,7 +2935,7 @@ static void guard_bh_eod(int rw, struct bio *bio, struct buffer_head *bh)
bio->bi_io_vec[0].bv_len = bytes;
/* ..and clear the end of the buffer for reads */
- if (rw & READ) {
+ if ((rw & RW_MASK) == READ) {
void *kaddr = kmap_atomic(bh->b_page);
memset(kaddr + bh_offset(bh) + bytes, 0, bh->b_size - bytes);
kunmap_atomic(kaddr);
--
GitLab