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From:   Liu Xiang <liu.xiang6@zte.com.cn>
To:     viro@zeniv.linux.org.uk
Cc:     linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        liuxiang_1999@126.com, Liu Xiang <liu.xiang6@zte.com.cn>
Subject: [PATCH] fs: Reset fully_mapped more accurately
Date:   Sun, 27 Jan 2019 21:15:33 +0800
Message-Id: <1548594933-19399-1-git-send-email-liu.xiang6@zte.com.cn>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Because get_block() might set the buffer mapped, reset fully_mapped
after it is more accurately.

Signed-off-by: Liu Xiang <liu.xiang6@zte.com.cn>
---
 fs/buffer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/buffer.c b/fs/buffer.c
index 52d024b..b2e9167 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2241,7 +2241,6 @@ int block_read_full_page(struct page *page, get_block_t *get_block)
 		if (!buffer_mapped(bh)) {
 			int err = 0;
 
-			fully_mapped = 0;
 			if (iblock < lblock) {
 				WARN_ON(bh->b_size != blocksize);
 				err = get_block(inode, iblock, bh, 0);
@@ -2249,6 +2248,7 @@ int block_read_full_page(struct page *page, get_block_t *get_block)
 					SetPageError(page);
 			}
 			if (!buffer_mapped(bh)) {
+				fully_mapped = 0;
 				zero_user(page, i * blocksize, blocksize);
 				if (!err)
 					set_buffer_uptodate(bh);
-- 
1.9.1