From: Al Viro <viro@zeniv.linux.org.uk>

There are four places where we end up adding an extra scope
covering just the range from constructor to destructor;
not sure if that's the best way to handle that.

The functions in question are ovl_write_iter(), ovl_splice_write(),
ovl_fadvise() and ovl_copyfile().

This is very likely *NOT* the final form of that thing - it
needs to be discussed.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 fs/overlayfs/file.c | 72 ++++++++++++++++++---------------------------
 1 file changed, 29 insertions(+), 43 deletions(-)

diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c
index 4b9e145bc7b8..a2911c632137 100644
--- a/fs/overlayfs/file.c
+++ b/fs/overlayfs/file.c

@@ -132,6 +132,8 @@ static struct fderr ovl_real_fdget(const struct file *file)
 	return ovl_real_fdget_meta(file, false);
 }
 
+DEFINE_CLASS(fd_real, struct fderr, fdput(_T), ovl_real_fdget(file), struct file *file)
+
 static int ovl_open(struct inode *inode, struct file *file)
 {
 	struct dentry *dentry = file_dentry(file);

@@ -174,7 +176,6 @@ static int ovl_release(struct inode *inode, struct file *file)
 static loff_t ovl_llseek(struct file *file, loff_t offset, int whence)
 {
 	struct inode *inode = file_inode(file);
-	struct fderr real;
 	const struct cred *old_cred;
 	loff_t ret;
 

@@ -190,7 +191,7 @@ static loff_t ovl_llseek(struct file *file, loff_t offset, int whence)
 			return vfs_setpos(file, 0, 0);
 	}
 
-	real = ovl_real_fdget(file);
+	CLASS(fd_real, real)(file);
 	if (fd_empty(real))
 		return fd_error(real);
 

@@ -211,8 +212,6 @@ static loff_t ovl_llseek(struct file *file, loff_t offset, int whence)
 	file->f_pos = fd_file(real)->f_pos;
 	ovl_inode_unlock(inode);
 
-	fdput(real);
-
 	return ret;
 }
 

@@ -253,8 +252,6 @@ static void ovl_file_accessed(struct file *file)
 static ssize_t ovl_read_iter(struct kiocb *iocb, struct iov_iter *iter)
 {
 	struct file *file = iocb->ki_filp;
-	struct fderr real;
-	ssize_t ret;
 	struct backing_file_ctx ctx = {
 		.cred = ovl_creds(file_inode(file)->i_sb),
 		.user_file = file,

@@ -264,22 +261,18 @@ static ssize_t ovl_read_iter(struct kiocb *iocb, struct iov_iter *iter)
 	if (!iov_iter_count(iter))
 		return 0;
 
-	real = ovl_real_fdget(file);
+	CLASS(fd_real, real)(file);
 	if (fd_empty(real))
 		return fd_error(real);
 
-	ret = backing_file_read_iter(fd_file(real), iter, iocb, iocb->ki_flags,
-				     &ctx);
-	fdput(real);
-
-	return ret;
+	return backing_file_read_iter(fd_file(real), iter, iocb, iocb->ki_flags,
+				      &ctx);
 }
 
 static ssize_t ovl_write_iter(struct kiocb *iocb, struct iov_iter *iter)
 {
 	struct file *file = iocb->ki_filp;
 	struct inode *inode = file_inode(file);
-	struct fderr real;
 	ssize_t ret;
 	int ifl = iocb->ki_flags;
 	struct backing_file_ctx ctx = {

@@ -295,7 +288,9 @@ static ssize_t ovl_write_iter(struct kiocb *iocb, struct iov_iter *iter)
 	/* Update mode */
 	ovl_copyattr(inode);
 
-	real = ovl_real_fdget(file);
+	{