Package: mount Version: 2.13.1.1-1 Severity: wishlist
ext3 mount(2) allows specification of journal device by "-o journal_dev=0xUUUU", but the device number has to be worked out by hand as mount(8) won't do the translation for us. (The underlying problem is that ext3 writes the device number of the journal device into the super block, but shuffling the devices around or moving the device to a different machine can change the device number allocated to the journal device. The super block also holds the UUID of the journal device, so we can find the real device number using liblkid. It would be nice if mount(8) did this for us. Alternatively e2fsprogs needs a /sbin/mount.ext3 helper prog). Currently: # blkid [...] /dev/md126: UUID="32df9e24-eb73-4173-bcd7-31a258e699cd" EXT_JOURNAL="b554a3ab-4741-4f34-a59c-f10490ca160a" SEC_TYPE="ext2" TYPE="ext3" /dev/md125: UUID="b554a3ab-4741-4f34-a59c-f10490ca160a" TYPE="jbd" # stat /dev/md126 File: `/dev/md126' Size: 0 Blocks: 0 IO Block: 4096 block special file Device: ch/12d Inode: 17870 Links: 1 Device type: 9,7e Access: (0660/brw-rw----) Uid: ( 0/ root) Gid: ( 6/ disk) Access: 2009-12-03 16:22:00.706591367 +0100 Modify: 2009-12-03 12:03:32.192382318 +0100 Change: 2009-12-03 12:03:32.192382318 +0100 # mount -o journal_dev=0x97e /dev/md125 /mnt [16235.523938] EXT3-fs: external journal device major/minor numbers have changed [16235.526338] kjournald starting. Commit interval 5 seconds [16235.576496] EXT3 FS on md126, external journal on md125 [16235.576539] EXT3-fs: mounted filesystem with ordered data mode. # Wish: # mount -o journal_dev=UUID="b554a3ab-4741-4f34-a59c-f10490ca160a" /dev/md125 /mnt Even better: # mount /dev/md125 /mnt [ reads superblock, sees it doesn't match current device numbers, fixes it automaticaly... ] -- System Information: Debian Release: 5.0.3 APT prefers stable APT policy: (500, 'stable') Architecture: amd64 (x86_64) Kernel: Linux 2.6.26-2-xen-amd64 (SMP w/2 CPU cores) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/bash Versions of packages mount depends on: ii libblkid1 1.41.3-1 block device id library ii libc6 2.7-18 GNU C Library: Shared libraries ii libselinux1 2.0.65-5 SELinux shared libraries ii libuuid1 1.41.3-1 universally unique id library mount recommends no packages. Versions of packages mount suggests: ii nfs-common 1:1.1.2-6lenny1 NFS support files common to client -- no debconf information -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]
