Re: [Libguestfs] virtdf outputs on host differs from df in guest

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: 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: 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/ab0a3e027665696502141319438... 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 Fedora Windows cross-compiler. Compile Windows programs, test, and build Windows installers. Over 100 libraries supported. http://fedoraproject.org/wiki/MinGW