On Mon, Jun 22, 2009 at 09:17:18PM +0200, Karel Zak wrote: > > Hi Roger, > > On Sun, Jun 21, 2009 at 02:26:51PM +0100, Roger Leigh wrote: > > This information should be recorded in /proc/mounts now that this > > information can be passed to mount(2). > > really? Ah, it's missing some context from where the discussion originally started. This is referring to MS_BIND mountflags no longer being ignored. > > http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=494001 > > I see in the bug report: > > > With linux >= 2.6.26, /proc/mounts contains all of the information in > > /etc/mtab, plus more. The mount system call can now pass all of the > > mount options to the kernel, so no information is missing in /proc/mounts. > > that's strange. I'd like to see kernel patch which implements > support for userspace specific mount options. Sorry, that's again missing context, and related to MS_BIND. At the time of writing, we were under the impression that this was the only remaining missing piece. However, we discovered with user= and (now fixed) loopback issues subsequently. > > Yes. For all the reasons given in the report. Additionally, > > it fixes a *lot* of bugs in mount > > which bugs? I don't remember any bug report. This is WRT Debian bug reports (http://bugs.debian.org/cgi-bin/pkgreport.cgi?pkg=mount;dist=unstable). It may be the case that the maintainer has neglected to forward them to yourselves (I'm not in any way responsible for util-linux in Debian myself). These bugs are all related to mtab becoming out of synch with the true mount state in /proc/mounts, or other failures. http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=354298 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=409008 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=446921 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=94076 Note that some of these are old, and may well be fixed now. There may also be other mtab-related bugs; these are the obvious ones with "mtab" in the bug title. There are others I omitted which are supposed to be fixed with newer releases than used when reported. > Currently, we have two userspace mount options, user= and uhelper=. > The uhelper= is used by HAL/DeviceKit (see umount man page). > > The /proc/mounts file does not properly store information about bind > mounts -- this is reason why we have /proc/self/mountinfo. > > My plan is to support systems without /etc/mtab and use > /proc/self/mountinfo in util-linux-ng 2.{17,18} (September/October > 2009 or so...). Cool. Just to clarify: at this point, barring any unforseen bugs, we can delete /etc/mtab and running with just /proc will be a valid supported configuration? What will the minimum supported kernel version for such a configuration be (with mountinfo)? Will support for a writable mtab be removed at some future point? Thanks, Roger -- .''`. Roger Leigh : :' : Debian GNU/Linux http://people.debian.org/~rleigh/ `. `' Printing on GNU/Linux? http://gutenprint.sourceforge.net/ `- GPG Public Key: 0x25BFB848 Please GPG sign your mail. -- To unsubscribe from this list: send the line "unsubscribe util-linux-ng" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
