linux-kernel - debugfs_remove_recursive() while a file is in use by userspace

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Message-ID: <CAA93t1pTkDpaZpQuVu0bQpxsxxUDViKU6-bLbporqkyHCJ0=mw@mail.gmail.com>
Date:	Mon, 28 Dec 2015 12:27:22 -0800
From:	Rajat Jain <rajatxjain@...il.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-newbie@...r.kernel.org
Cc:	Greg Kroah-Hartman <greg@...ah.com>
Subject: debugfs_remove_recursive() while a file is in use by userspace

Hi,

I wanted to understand the behavior taken when a module calls
debugfs_remove_recursive() on a directory, while files under that
directory may still be in use by the userspace (for instance an
ongoing read / write operation).

Does the function wait

(1) until all the currently executing file operation methods
(read/write/map etc) have returned?
OR
(2) until the user has given up all references (descriptors) to the
files under the directory (i.e. until release() method has been
called)?

Thanks,

Rajat
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