Am Montag, 26. März 2012 schrieb Calvin Walton: > On Mon, 2012-03-26 at 10:51 +0200, Karel Zak wrote: > > On Sat, Mar 24, 2012 at 06:21:05PM +0000, Hugo Mills wrote: > > > As Sadner says, you have to run "btrfs dev scan" before you try > > > to > > > > > > mount the FS. If you have root on btrfs, this will have to go in an > > > initrd; otherwise, it can go in your initscripts anywhere before > > > the non-root filesystem mounts. > > > > > > Basically, the kernel needs to know which devices hold which > > > btrfs > > > > > > filesystems (organised by UUID) before it tries to mount them. So, > > > there's an ioctl that is used for sending that data to the kernel, > > > and a userspace tool (btrfs dev scan) that enumerates all of the > > > block devices it can see, looks for a btrfs superblock on them, > > > and tells the kernel. > > > > Please, move all this logic to udev rules where we already scans all > > devices. It's really bad to scan all device more than once. We spent > > years to fix this problem for LVM, I don't think that btrfs has to > > repeat the same mistakes. > > Oh, this is already possible to do with udev rules, quite easily. In > fact, dracut ships with the appropriate udev rules, which it uses to > initialize btrfs filesystems in the initramfs: > > http://git.kernel.org/?p=boot/dracut/dracut.git;a=blob;f=modules.d/90bt > rfs/80-btrfs.rules;hb=HEAD > > which would be suitable with minor modifications for use in a system > udev installation as well.
I reported this for Debian long time ago as: please support raid configurations automatically http://bugs.debian.org/bug=634658 I will be forwarding your mail to the bug report as to suggest this udev based solution. I has also been reported as: btrfs-tools: add initramfs boot and hook scripts http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=559710 please provide non-initramfs-tools integration http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=585568 Thanks, -- Martin 'Helios' Steigerwald - http://www.Lichtvoll.de GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7 -- 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
