Re: [Libguestfs] virtdf outputs on host differs from df in guest
On Thu, Jan 04, 2018 at 12:58:40PM +0800, Chen Fan wrote:
[In guest]
python -c 'import os; s = os.statvfs ("/"); print
s'
posix.statvfs_result(f_bsize=4096, f_frsize=4096, f_blocks=5886149,
f_bfree=4802342, f_bavail=4802342, f_files=23556096,
f_ffree=23435372, f_favail=23435372, f_flag=4096, f_namemax=255)
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]
# guestfish --ro -d rpm-build-for-7.2 -i statvfs /
bsize: 4096
frsize: 4096
blocks: 5886149
bfree: 4810534
bavail: 4810534
files: 23556096
ffree: 23435372
favail: 23435372
fsid: 64513
flag: 4097
namemax: 255
# 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
Was the guest quiescent and fully sync()d before you ran the python
commands?
In any case all that libguestfs is doing is executing the
statvfs(2) system call on a copy of the disk:
https://github.com/libguestfs/libguestfs/blob/e6e23c4d77ee15779f833fd4fbe...
So if there's any difference then it's something to do with the guest
kernel vs the host kernel calculations.
I wouldn't expect the numbers to be exactly the same, but libguestfs
doesn't alter the numbers, it just passes them through.
Rich.
--
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