From mboxrd@z Thu Jan 1 00:00:00 1970 From: greg@kroah.com (Greg KH) Date: Thu, 29 Jan 2015 11:37:37 -0800 Subject: Linux Kernel readlink equivalent In-Reply-To: References: Message-ID: <20150129193737.GA3135@kroah.com> To: kernelnewbies@lists.kernelnewbies.org List-Id: kernelnewbies.lists.kernelnewbies.org On Thu, Jan 29, 2015 at 01:11:13PM -0500, David Legault wrote: > Hello, > > I'm working on some linux kernel driver stuff and I have a fake path called / > dev/blah/whatever that points to /dev/block/real_device. That's a userspace "path", right? Why would the kernel care about this? > The issue is that lookup_bdev will fail to follow the symlink so I'd like to > massage the path upfront by getting the real path (/dev/block/real_device) so I > can hand that off to lookup_bdev so it returns successfully instead of an > error. Why are you calling this from within the kernel? You should have a bdev already directly within the kernel, no need to muck around in /dev/ What exactly are you doing that you feel you need access to a block device node? thanks, greg k-h