On 24. January 2011 - 13:13, Hugo Mills wrote: > Date: Mon, 24 Jan 2011 13:13:41 +0000 > From: Hugo Mills <hugo-l...@carfax.org.uk> > To: Felix Blanke <felixbla...@gmail.com> > Cc: kreij...@inwind.it, Hugo Mills <hugo-l...@carfax.org.uk>, > linux-btrfs@vger.kernel.org > Subject: Re: Bug in mkfs.btrfs?! > Mail-Followup-To: Hugo Mills <hugo-l...@carfax.org.uk>, Felix Blanke > <felixbla...@gmail.com>, kreij...@inwind.it, linux-btrfs@vger.kernel.org > > On Mon, Jan 24, 2011 at 02:01:04PM +0100, Felix Blanke wrote: > > Hi, > > > > you were talking about the LOOP_GET_STATUS function. I'm not quite sure > > where does it > > came from. Is it part of the kernel? Or does it come from the util-linux > > package? > > It's an ioctl (number 0x4c03) that works on loop devices, and > returns information about the loop device. Being an ioctl, it's > implemented in the kernel. Unfortunately, since it's part of the > kernel API, the size of the name field is probably fixed for the rest > of time, and so the bug can't be fixed. >
That sounds great :/ > > I'm searching for the right location where do report that bug :) > > linux-kernel mailing list, I think. > > > Btw: I tested it with util-linux-2.19-rc1. The strace still contains > > the truncated path, and no '*'. Therefore I think that ioctl is from > > the kernel. > > Indeed. > > What I find interesting is that my copy of losetup follows symlinks > from the /dev/disk/by-id/... path back to the original device node > (/dev/dm-7 in my test case) before setting up the loop, whereas yours > seems not to. > > I think that that's probably the easiest solution to this problem: > modify losetup to use realpath(3) on the device node it's given. I dont see where that helps with the problem. If I understand Goffredo correct mkfs.btrfs is using the ioctl to get the path. Letting losetup following the link will fix the output of "losetup /dev/loopX", but it will not fix the truncated path from the ioctl and therefore it will not fix the problem with mkfs.btrfs. Felix > > Hugo. > > -- > === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === > PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk > --- make bzImage, not war --- ---end quoted text--- -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
