linux-kernel - [PATCH 4.1 186/202] overlay: Call ovl_drop_write() earlier in ovl_dentry

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Date:	Sat, 17 Oct 2015 18:59:29 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, David Howells <dhowells@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	"Kamata, Munehisa" <kamatam@...zon.com>
Subject: [PATCH 4.1 186/202] overlay: Call ovl_drop_write() earlier in ovl_dentry_open()

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

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

From: David Howells <dhowells@...hat.com>

commit f25801ee4680ef1db21e15c112e6e5fe3ffe8da5 upstream.

Call ovl_drop_write() earlier in ovl_dentry_open() before we call vfs_open()
as we've done the copy up for which we needed the freeze-write lock by that
point.

Signed-off-by: David Howells <dhowells@...hat.com>
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
Cc: "Kamata, Munehisa" <kamatam@...zon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/overlayfs/inode.c |   14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -342,31 +342,25 @@ static int ovl_dentry_open(struct dentry
 	int err;
 	struct path realpath;
 	enum ovl_path_type type;
-	bool want_write = false;
 
 	type = ovl_path_real(dentry, &realpath);
 	if (ovl_open_need_copy_up(file->f_flags, type, realpath.dentry)) {
-		want_write = true;
 		err = ovl_want_write(dentry);
 		if (err)
-			goto out;
+			return err;
 
 		if (file->f_flags & O_TRUNC)
 			err = ovl_copy_up_last(dentry, NULL, true);
 		else
 			err = ovl_copy_up(dentry);
+		ovl_drop_write(dentry);
 		if (err)
-			goto out_drop_write;
+			return err;
 
 		ovl_path_upper(dentry, &realpath);
 	}
 
-	err = vfs_open(&realpath, file, cred);
-out_drop_write:
-	if (want_write)
-		ovl_drop_write(dentry);
-out:
-	return err;
+	return vfs_open(&realpath, file, cred);
 }
 
 static const struct inode_operations ovl_file_inode_operations = {


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