Sure. First, I disabled dk-disks to turn off all automount magic:
# killall devkit-disks-daemon
# chmod 0 /usr/lib/devicekit-disks/devkit-disks-daemon
Now, mount my removable USB HD:
# echo 3 >/proc/sys/vm/drop_caches
# mount /dev/sdb1 /mnt; time df -h
[...]
/dev/sdb1 233G 226G 7,5G 97% /mnt
real 1m16.649s
user 0m0.000s
sys 0m1.050s
It works fine with usefree:
# mount -o usefree /dev/sdb1 /mnt; time df -h
[...]
/dev/sdb1 233G 226G 7,5G 97% /mnt
real 0m0.005s
user 0m0.010s
sys 0m0.000s
And strace shows that it's statfs:
# mount /dev/sdb1 /mnt; strace -vtt df -h
[...]
12:15:12.103174 statfs("/home/martin/.gv
f_files=0, f_ffree=0, f_fsid={0, 0}, f_n
12:15:12.103312 statfs("/mnt",
... long pause here, with
root 21844 2.9 0.0 5536 940 pts/5 D+ 12:15 0:01 df -h
(deep kernel sleep)
and a minute later it finishes:
12:15:12.103312 statfs("/mnt", {f_type="MSDOS_SUPER_MAGIC", f_bsize=16384,
f_blocks=15254800, f_bfree=486982, f_bavail=486982, f_files=0, f_ffree=0,
f_fsid={2065, 0}, f_namelen=260, f_frsize=16384}) = 0
12:16:26.772458 write(1, "/dev/sdb1 233G 226G"..., 49/dev/sdb1
233G 226G 7,5G 97% /mnt
--
regression: statfs() takes a long time on VFAT without "usefree"
https://bugs.launchpad.net/bugs/444915
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