Changing label of a mounted XFS filesystem
Hi
Is there a particular reason that the label of a mounted XFS fileystem can't be changed?
The man-page of xfs_admin gives a blanket "Devices that are mounted cannot be modified" but no explanation for why that is.
In my case it's the label of the root-filesystem i want to change. So to change it i would have to boot the computer with some kind of live or rescure-system. Or i would need to temporarily connect the device to another computer, both aren't really nice hoops to jump through just to change a few characters.
The only thing i can compare this to is ext2 and with ext2 (/boot partition, so it really is ext2) i can change the label to my hearts content, even the device is mounted.
For my case i could live with it if i could remount the filesystem RO, change the label and then having to reboot the machine, still nicer than the other 2 options.
Signature · 6 lines
Matthias _______________________________________________ xfs mailing list [email protected] http://oss.sgi.com/mailman/listinfo/xfs
Hi,
Quoted 5 lines · Matthias Schniedermeyer
Hi
Is there a particular reason that the label of a mounted XFS fileystem can't be changed?
Maybe since we have no user request for this function? :)
Quoted 9 lines
The man-page of
xfs_admingives a blanket "Devices that are mounted cannot be modified" but no explanation for why that is.In my case it's the label of the root-filesystem i want to change. So to change it i would have to boot the computer with some kind of live or rescure-system. Or i would need to temporarily connect the device to another computer, both aren't really nice hoops to jump through just to change a few characters.
Quoted 7 lines
The only thing i can compare this to is ext2 and with ext2 (/boot partition, so it really is ext2) i can change the label to my hearts content, even the device is mounted.
For my case i could live with it if i could remount the filesystem RO, change the label and then having to reboot the machine, still nicer than the other 2 options.
Btrfs support set/change label on a mounted file system via ioctl(2), maybe we can implement it if that sounds useful to our users.
Cheers,
-Jeff
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Quoted 24 lines · Jeff Liu
Hi,
Quoted 5 lines · Matthias Schniedermeyer
Hi
Is there a particular reason that the label of a mounted XFS fileystem can't be changed?
Maybe since we have no user request for this function? :)
Quoted 13 lines
The man-page of
xfs_admingives a blanket "Devices that are mounted cannot be modified" but no explanation for why that is.In my case it's the label of the root-filesystem i want to change. So to change it i would have to boot the computer with some kind of live or rescure-system. Or i would need to temporarily connect the device to another computer, both aren't really nice hoops to jump through just to change a few characters.
The only thing i can compare this to is ext2 and with ext2 (/boot partition, so it really is ext2) i can change the label to my hearts content, even the device is mounted.
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For my case i could live with it if i could remount the filesystem RO, change the label and then having to reboot the machine, still nicer than the other 2 options.
Btrfs support set/change label on a mounted file system via ioctl(2), maybe we can implement it if that sounds useful to our users.
I would vote for that, i've run into this particular brickwall several times over the years.
I more or less reguarly clone or "move" storage and/or machines around and several times i forgot to re-label filesystems "at that point in time were it was easily done" and then run into the brickwall when first booting whatever i built at that time. Same has happend to me for /etc/fstab and/or GRUB configuration. But unless GRUB doesn't boot at all it can be rectified without too much hassle.
Yesterday i "fixed" it by changing the fstab to the "wrong" label.
The other solution would be for me to make a checklist, so i don't forget such things. But that would be to easy. ;-)
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Matthias _______________________________________________ xfs mailing list [email protected] http://oss.sgi.com/mailman/listinfo/xfs
Quoted 11 lines · Matthias Schniedermeyer
Quoted 10 lines · Jeff Liu
Hi,
Quoted 5 lines · Matthias Schniedermeyer
Hi
Is there a particular reason that the label of a mounted XFS fileystem can't be changed?
Maybe since we have no user request for this function? :)
Most likely. It's currently done by xfs_db, which is an offline tool.
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Quoted 16 lines
The man-page of
xfs_admingives a blanket "Devices that are mounted cannot be modified" but no explanation for why that is.In my case it's the label of the root-filesystem i want to change. So to change it i would have to boot the computer with some kind of live or rescure-system. Or i would need to temporarily connect the device to another computer, both aren't really nice hoops to jump through just to change a few characters.
The only thing i can compare this to is ext2 and with ext2 (/boot partition, so it really is ext2) i can change the label to my hearts content, even the device is mounted.
For my case i could live with it if i could remount the filesystem RO, change the label and then having to reboot the machine, still nicer than the other 2 options.
Quoted 5 lines
Quoted 2 lines
Btrfs support set/change label on a mounted file system via ioctl(2), maybe we can implement it if that sounds useful to our users.
I would vote for that, i've run into this particular brickwall several times over the years.
There's a bunch of things I'd like to make online modifiable that currently can only be done offline by xfs_db and other tools. I'll add this to the list, and hopefully when I get a little time I'll do something about it...
Cheers,
Dave.
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Dave Chinner [email protected] _______________________________________________ xfs mailing list [email protected] http://oss.sgi.com/mailman/listinfo/xfs