debugfs: make error message a bit more verbose

When a file/directory is already present in debugfs, and it is attempted
to be created again, be more specific about what file/directory is being
created and where it is trying to be created to give a bit more help to
developers to figure out the problem.

Cc: Stephen Rothwell <[email protected]>
Cc: Rafael J. Wysocki <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: Takashi Iwai <[email protected]>
Reviewed-by: Mark Brown <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: gregkh

fs/debugfs/inode.c

@@ -311,8 +311,13 @@ static struct dentry *start_creating(const char *name, struct dentry *parent)
 	inode_lock(d_inode(parent));
 	dentry = lookup_one_len(name, parent, strlen(name));
 	if (!IS_ERR(dentry) && d_really_is_positive(dentry)) {
+		if (d_is_dir(dentry))
+			pr_err("Directory '%s' with parent '%s' already present!\n",
+			       name, parent->d_name.name);
+		else
+			pr_err("File '%s' in directory '%s' already present!\n",
+			       name, parent->d_name.name);
 		dput(dentry);
-		pr_err("File '%s' already present!\n", name);
 		dentry = ERR_PTR(-EEXIST);
 	}