FAILED: patch "[PATCH] vboxsf: Make vboxsf_dir_create() return the handle for the" failed to apply to 5.10-stable tree

[<gregkh@xxxxxxxxxxxxxxxxxxx>]

The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

>From ab0c29687bc7a890d1a86ac376b0b0fd78b2d9b6 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@xxxxxxxxxx>
Date: Thu, 21 Jan 2021 10:22:27 +0100
Subject: [PATCH] vboxsf: Make vboxsf_dir_create() return the handle for the
 created file

Make vboxsf_dir_create() optionally return the vboxsf-handle for
the created file. This is a preparation patch for adding atomic_open
support.

Fixes: 0fd169576648 ("fs: Add VirtualBox guest shared folder (vboxsf) support")
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>

diff --git a/fs/vboxsf/dir.c b/fs/vboxsf/dir.c
index 6ff84343edca..87d5b2fef592 100644
--- a/fs/vboxsf/dir.c
+++ b/fs/vboxsf/dir.c
@@ -253,7 +253,7 @@ static int vboxsf_dir_instantiate(struct inode *parent, struct dentry *dentry,
 }
 
 static int vboxsf_dir_create(struct inode *parent, struct dentry *dentry,
-			     umode_t mode, bool is_dir, bool excl)
+			     umode_t mode, bool is_dir, bool excl, u64 *handle_ret)
 {
 	struct vboxsf_inode *sf_parent_i = VBOXSF_I(parent);
 	struct vboxsf_sbi *sbi = VBOXSF_SBI(parent->i_sb);
@@ -278,30 +278,34 @@ static int vboxsf_dir_create(struct inode *parent, struct dentry *dentry,
 	if (params.result != SHFL_FILE_CREATED)
 		return -EPERM;
 
-	vboxsf_close(sbi->root, params.handle);
-
 	err = vboxsf_dir_instantiate(parent, dentry, &params.info);
 	if (err)
-		return err;
+		goto out;
 
 	/* parent directory access/change time changed */
 	sf_parent_i->force_restat = 1;
 
-	return 0;
+out:
+	if (err == 0 && handle_ret)
+		*handle_ret = params.handle;
+	else
+		vboxsf_close(sbi->root, params.handle);
+
+	return err;
 }
 
 static int vboxsf_dir_mkfile(struct user_namespace *mnt_userns,
 			     struct inode *parent, struct dentry *dentry,
 			     umode_t mode, bool excl)
 {
-	return vboxsf_dir_create(parent, dentry, mode, false, excl);
+	return vboxsf_dir_create(parent, dentry, mode, false, excl, NULL);
 }
 
 static int vboxsf_dir_mkdir(struct user_namespace *mnt_userns,
 			    struct inode *parent, struct dentry *dentry,
 			    umode_t mode)
 {
-	return vboxsf_dir_create(parent, dentry, mode, true, true);
+	return vboxsf_dir_create(parent, dentry, mode, true, true, NULL);
 }
 
 static int vboxsf_dir_unlink(struct inode *parent, struct dentry *dentry)