Not only can XFS be resized online, but that works just as well on the root filesystem.
Well, after I symlinked /dev/root to the correct device, because Linux still uses the ridiculous archaic SunOS-ism of having mount and unmount and df update and consult the regular file /etc/mtab instead of just asking the kernel, like any sane system would do.
And thus the kernel's filesystem table (readable at /proc/mounts, in the same format as mtab, even) winds up with a bunch of useless junk in it, which probably wouldn't be put up with if people actually had to look at it all the time.
Anyway. Being able to xfs_growfs the root filesystem and have it (mostly) just work is a refreshing change from certain other filesystem features; e.g., on Solaris 9, UFS snapshots' being forbidden for the filesystems holding / and /var, because it's necessary to briefly disable writing, and I guess that might deadlock or something.
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