linux-kernel - [PATCH 4.11 089/114] f2fs: fix multiple f2fs_add_link() having same name for inline dentry

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Date:   Thu, 18 May 2017 12:46:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sheng Yong <shengyong1@...wei.com>,
        Chao Yu <yuchao0@...wei.com>, Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH 4.11 089/114] f2fs: fix multiple f2fs_add_link() having same name for inline dentry

4.11-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sheng Yong <shengyong1@...wei.com>

commit d3bb910c15d75ee3340311c64a1c05985bb663a3 upstream.

Commit 88c5c13a5027 (f2fs: fix multiple f2fs_add_link() calls having
same name) does not cover the scenario where inline dentry is enabled.
In that case, F2FS_I(dir)->task will be NULL, and __f2fs_add_link will
lookup dentries one more time.

This patch fixes it by moving the assigment of current task to a upper
level to cover both normal and inline dentry.

Fixes: 88c5c13a5027 (f2fs: fix multiple f2fs_add_link() calls having same name)
Signed-off-by: Sheng Yong <shengyong1@...wei.com>
Reviewed-by: Chao Yu <yuchao0@...wei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/f2fs/dir.c |   13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -207,13 +207,9 @@ static struct f2fs_dir_entry *find_in_le
 		f2fs_put_page(dentry_page, 0);
 	}
 
-	/* This is to increase the speed of f2fs_create */
-	if (!de && room) {
-		F2FS_I(dir)->task = current;
-		if (F2FS_I(dir)->chash != namehash) {
-			F2FS_I(dir)->chash = namehash;
-			F2FS_I(dir)->clevel = level;
-		}
+	if (!de && room && F2FS_I(dir)->chash != namehash) {
+		F2FS_I(dir)->chash = namehash;
+		F2FS_I(dir)->clevel = level;
 	}
 
 	return de;
@@ -254,6 +250,9 @@ struct f2fs_dir_entry *__f2fs_find_entry
 			break;
 	}
 out:
+	/* This is to increase the speed of f2fs_create */
+	if (!de)
+		F2FS_I(dir)->task = current;
 	return de;
 }