There are some strange things going on with the kernel XFS driver.
Opening a filesystem for write or read-only makes a difference to the
stats returned.
With bit-for-bit identical filesystems:
><rescue> mount /dev/sda1 /sysroot
><rescue> stat -f /sysroot
File: "/sysroot"
ID: 80100000000 Namelen: 255 Type: xfs
Block size: 4096 Fundamental block size: 4096
Blocks: Total: 24713 Free: 23347 Available: 23347
Inodes: Total: 51136 Free: 51133
vs:
><rescue> mount -o ro /dev/sda1 /sysroot
><rescue> stat -f /sysroot
File: "/sysroot"
ID: 80100000000 Namelen: 255 Type: xfs
Block size: 4096 Fundamental block size: 4096
Blocks: Total: 24713 Free: 24653 Available: 24653
Inodes: Total: 51136 Free: 51133
virt-df always uses the ‘-o ro’ option.
Despite this virt-df itself is working fine:
$ virt-df -a test1.img
Filesystem 1K-blocks Used Available Use%
test1.img:/dev/sda1 98852 240 98612 1%
Using the calculations from here:
https://github.com/libguestfs/libguestfs/blob/ab0a3e0276656965021413194380ae602c05513d/df/output.c#L126-L136
blocks * bsize / 1024 = 24713 * 4096 / 1024 = 98852
(blocks - bfree) * bsize / 1024 = (24713-24653) * 4096 / 1024 = 240
bavail * bsize / 1024 = 24653 * 4096 / 1024 = 98612
So everything appears to be working fine, besides possibly odd stuff
going on in the kernel XFS driver.
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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