linux-kernel - [f2fs-dev] [PATCH] f2fs: fix error path when fail to read inline data

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Date:	Sat, 29 Mar 2014 15:30:40 +0800
From:	Chao Yu <chao2.yu@...sung.com>
To:	??? <jaegeuk.kim@...sung.com>
Cc:	linux-f2fs-devel@...ts.sourceforge.net,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [f2fs-dev] [PATCH] f2fs: fix error path when fail to read inline data

We should unlock page in ->readpage() path and also should unlock & release page
in error path of ->write_begin() to avoid deadlock or memory leak.
So let's add release code to fix the problem when we fail to read inline data.

Signed-off-by: Chao Yu <chao2.yu@...sung.com>
---
 fs/f2fs/data.c   |   14 ++++++++++----
 fs/f2fs/inline.c |    4 +++-
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 598bfa6..45abd60 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -942,13 +942,19 @@ inline_data:
 	if (dn.data_blkaddr == NEW_ADDR) {
 		zero_user_segment(page, 0, PAGE_CACHE_SIZE);
 	} else {
-		if (f2fs_has_inline_data(inode))
+		if (f2fs_has_inline_data(inode)) {
 			err = f2fs_read_inline_data(inode, page);
-		else
+			if (err) {
+				page_cache_release(page);
+				return err;
+			}
+		} else {
 			err = f2fs_submit_page_bio(sbi, page, dn.data_blkaddr,
 							READ_SYNC);
-		if (err)
-			return err;
+			if (err)
+				return err;
+		}
+
 		lock_page(page);
 		if (unlikely(!PageUptodate(page))) {
 			f2fs_put_page(page, 1);
diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c
index 31ee5b1..383db1f 100644
--- a/fs/f2fs/inline.c
+++ b/fs/f2fs/inline.c
@@ -45,8 +45,10 @@ int f2fs_read_inline_data(struct inode *inode, struct page *page)
 	}
 
 	ipage = get_node_page(sbi, inode->i_ino);
-	if (IS_ERR(ipage))
+	if (IS_ERR(ipage)) {
+		unlock_page(page);
 		return PTR_ERR(ipage);
+	}
 
 	zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
 
-- 
1.7.9.5


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