From mboxrd@z Thu Jan 1 00:00:00 1970 From: Josef Bacik Subject: Re: [PATCH] Btrfs: add a disk info ioctl to get the disks attached to a filesystem Date: Tue, 28 Sep 2010 20:08:10 -0400 Message-ID: <20100929000809.GC32420@dhcp231-156.rdu.redhat.com> References: <1285707196-16268-1-git-send-email-josef@redhat.com> <20100928232513.GA20629@infradead.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Josef Bacik , linux-btrfs@vger.kernel.org, mzerqung@0pointer.de To: Christoph Hellwig Return-path: In-Reply-To: <20100928232513.GA20629@infradead.org> List-ID: On Tue, Sep 28, 2010 at 07:25:13PM -0400, Christoph Hellwig wrote: > On Tue, Sep 28, 2010 at 04:53:16PM -0400, Josef Bacik wrote: > > This was a request from the systemd guys. They need a quick and easy way to get > > all devices attached to a Btrfs filesystem in order to check if any of the disks > > are SSD for...something, I didn't ask :). I've tested this with the > > btrfs-progs patch that accompanies this patch. Thanks, > > So please tell the "systemd guys" to explain what the fuck they're doing > to linux-fsdevel and fiend a proper interface. Chance is they will fuck > up as much as just about ever other lowlevel userspace tool are very > high. > Lennart? :). And Christoph, what would be a good interface? LVM has a slaves/ subdir in sysfs which symlinks to all of their dev's, would you rather I resurrect the sysfs stuff for Btrfs and do a similar thing? I'm open to suggestions, I just took the quick and painless way out. Thanks, Josef