linux-kernel - [PATCH 5/7] ext4: rename: move EMLINK check up

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Message-Id: <1380643239-16060-6-git-send-email-miklos@szeredi.hu>
Date:	Tue,  1 Oct 2013 18:00:37 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	viro@...IV.linux.org.uk, torvalds@...ux-foundation.org,
	hch@...radead.org, akpm@...ux-foundation.org, dhowells@...hat.com,
	zab@...hat.com, jack@...e.cz, tytso@....edu, mszeredi@...e.cz
Subject: [PATCH 5/7] ext4: rename: move EMLINK check up

From: Miklos Szeredi <mszeredi@...e.cz>

Move checking i_nlink from after ext4_get_first_dir_block() to before.  The
check doesn't rely on the result of that function and the function only
fails on fs corruption, so the order shouldn't matter.

Signed-off-by: Miklos Szeredi <mszeredi@...e.cz>
---
 fs/ext4/namei.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 01bd80e..1348251 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -3082,6 +3082,10 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
 			retval = -ENOTEMPTY;
 			if (!empty_dir(new.inode))
 				goto end_rename;
+		} else {
+			retval = -EMLINK;
+			if (new.dir != old.dir && EXT4_DIR_LINK_MAX(new.dir))
+				goto end_rename;
 		}
 		retval = -EIO;
 		old.dir_bh = ext4_get_first_dir_block(handle, old.inode,
@@ -3091,10 +3095,6 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
 			goto end_rename;
 		if (le32_to_cpu(old.parent_de->inode) != old.dir->i_ino)
 			goto end_rename;
-		retval = -EMLINK;
-		if (!new.inode && new.dir != old.dir &&
-		    EXT4_DIR_LINK_MAX(new.dir))
-			goto end_rename;
 		BUFFER_TRACE(old.dir_bh, "get_write_access");
 		retval = ext4_journal_get_write_access(handle, old.dir_bh);
 		if (retval)
-- 
1.8.1.4

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