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

hi Jones, Sorry for the late reply. when I used your method to execute command: $guestfish -N fs:xfs -m /dev/sda1 statvfs / libguestfs: error: mkfs: xfs: /dev/sda1: mkfs.xfs: No such file or directory guestfish: error creating prepared disk image 'fs:xfs' on 'test1.img': failed to create filesystem (xfs): mkfs: xfs: /dev/sda1: mkfs.xfs: No such file or directory does I need to rebuild the iniramfs to include mkfs.xfs, is this the root reason that cause the different numbers ? then I used virt-rescure method , the filesystem type was ext2/ext3: mount: /dev/sda1 is write-protected, mounting read-only mount: unknown filesystem type '(null)' File: "/sysroot" ID: ab0d9f3277e010fd Namelen: 255 Type: ext2/ext3 Block size: 4096 Fundamental block size: 4096 Blocks: Total: 1032112 Free: 941307 Available: 888879 Inodes: Total: 262144 Free: 250996 Thanks, Chen At 2018-01-05 00:22:46, "Richard W.M. Jones" <rjones(a)redhat.com&gt; wrote: >To summarise: > >>[In guest] >> python -c 'import os; s = os.statvfs ("/boot"); print s' >> posix.statvfs_result(f_bsize=4096, f_frsize=4096, f_blocks=127147, >> f_bfree=93815, f_bavail=93815, f_files=512000, f_ffree=511626, >> f_favail=511626, f_flag=4096, f_namemax=255) > >>[From the host via libguestfs] >> # sudo guestfish --ro -d rpm-build-for-7.2 -i statvfs /boot >> bsize: 4096 >> frsize: 4096 >> blocks: 127147 >> bfree: 100215 >> bavail: 100215 >> files: 512000 >> ffree: 511626 >> favail: 511626 >> fsid: 2049 >> flag: 4097 >> namemax: 255 > >[In virt-rescue] >> Block size: 4096 Fundamental block size: 4096 >> Blocks: Total: 127147 Free: 93815 Available: 93815 >> Inodes: Total: 512000 Free: 511626 > >The block stats are the same as the "in guest" results above, >but slightly different from libguestfs. > > - * - * - * - > >I wanted to see if I could reproduce this with a very simple and >reproducible example. I made the assumption that this guest is using XFS. > >(1) Make an XFS filesystem and use libguestfs to query the statvfs: > >$ guestfish -N fs:xfs -m /dev/sda1 statvfs / >bsize: 4096 >frsize: 4096 >blocks: 24713 >bfree: 23347 >bavail: 23347 >files: 51136 >ffree: 51133 >favail: 51133 >fsid: 2049 >flag: 4096 >namemax: 255 > >(2) Open the same disk image in virt-rescue and examine with stat >command: > >$ virt-rescue -a test1.img >><rescue> mount /dev/sda1 /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 > > >In this case the numbers are the same ... > >I would really like a bit more information though: > >(a) Are you using XFS or another filesystem? > >(b) Can you make a small independent reproducer like mine above? > >Rich. > >-- >Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones >Read my programming and virtualization blog: http://rwmj.wordpress.com >libguestfs lets you edit virtual machines. Supports shell scripting, >bindings from many languages. http://libguestfs.org