ext4: fix forgetten xattr lock protection in ext4_expand_extra_isize

We should avoid the contention between the i_extra_isize update and
the inline data insertion, so move the xattr trylock in front of
i_extra_isize update.

Signed-off-by: Miao Xie <miaoxie@huawei.com>
Reviewed-by: Wang Shilong <wshilong@ddn.com>
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 56bca45..5dabbf2 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -5713,10 +5713,15 @@ static int ext4_expand_extra_isize(struct inode *inode,
 {
 	struct ext4_inode *raw_inode;
 	struct ext4_xattr_ibody_header *header;
+	int no_expand;
+	int error;
 
 	if (EXT4_I(inode)->i_extra_isize >= new_extra_isize)
 		return 0;
 
+	if (ext4_write_trylock_xattr(inode, &no_expand) == 0)
+		return 0;
+
 	raw_inode = ext4_raw_inode(&iloc);
 
 	header = IHDR(inode, raw_inode);
@@ -5728,12 +5733,21 @@ static int ext4_expand_extra_isize(struct inode *inode,
 		       EXT4_I(inode)->i_extra_isize, 0,
 		       new_extra_isize - EXT4_I(inode)->i_extra_isize);
 		EXT4_I(inode)->i_extra_isize = new_extra_isize;
+		ext4_write_unlock_xattr(inode, &no_expand);
 		return 0;
 	}
 
 	/* try to expand with EAs present */
-	return ext4_expand_extra_isize_ea(inode, new_extra_isize,
-					  raw_inode, handle);
+	error = ext4_expand_extra_isize_ea(inode, new_extra_isize,
+					   raw_inode, handle);
+	if (error) {
+		/*
+		 * Inode size expansion failed; don't try again
+		 */
+		no_expand = 1;
+	}
+	ext4_write_unlock_xattr(inode, &no_expand);
+	return error;
 }
 
 /*