On Thu, 29 Nov 2018 16:39:48 -0600, Eric Blake wrote: > On 11/29/18 4:32 PM, Mark Raymond wrote: >> This sounds similar to a problem I have just encountered. >> >> If I have filesystems mounted at: >> >> /mnt/foo >> /mnt/foo/subfs >> >> then do >> >> mount --bind /mnt/foo /mnt/bar >> >> then the contents of `/mnt/foo` and `/mnt/bar` are different, because >> `/mnt/foo/subfs` has contents but `/mnt/bar/subfs` does not have >> contents. However >> >> diff -r /mnt/foo /mnt/bar >> >> returns no results. However in my case, rsync is also unable to show >> the differences. > > POSIX says that a file is uniquely determined by its inode and device > number. If you have a file system that reports the same device for > different contents, your file system is broken, and it's no wonder that > LOTS of Unix tools will fail to see the differences, because your file > system is lying. We can't fix it in diffutils; that would have to be a > fix in the kernel implementation of your file system driver. > > -- > Eric Blake, Principal Software Engineer > Red Hat, Inc. +1-919-301-3266 > Virtualization: qemu.org | libvirt.org
Maybe the closest thing to a bug there is that /mnt/bar/subfs does not have contents. -- Eric Deplagne
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