From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Thu, 19 Jan 2023 18:47:00 +0000 (-0800)
Subject: f2fs: get out of a repeat loop when getting a locked data page
X-Git-Tag: v6.6.17~4012^2~21
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d2d9bb3b6d2fbccb5b33d3a85a2830971625a4ea;p=platform%2Fkernel%2Flinux-rpi.git

f2fs: get out of a repeat loop when getting a locked data page

https://bugzilla.kernel.org/show_bug.cgi?id=216050

Somehow we're getting a page which has a different mapping.
Let's avoid the infinite loop.

Cc: <stable@vger.kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 5882afe..ecebc3a 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1389,18 +1389,14 @@ struct page *f2fs_get_lock_data_page(struct inode *inode, pgoff_t index,
 {
 	struct address_space *mapping = inode->i_mapping;
 	struct page *page;
-repeat:
+
 	page = f2fs_get_read_data_page(inode, index, 0, for_write, NULL);
 	if (IS_ERR(page))
 		return page;
 
 	/* wait for read completion */
 	lock_page(page);
-	if (unlikely(page->mapping != mapping)) {
-		f2fs_put_page(page, 1);
-		goto repeat;
-	}
-	if (unlikely(!PageUptodate(page))) {
+	if (unlikely(page->mapping != mapping || !PageUptodate(page))) {
 		f2fs_put_page(page, 1);
 		return ERR_PTR(-EIO);
 	}