Messages in this thread | | | Date | Mon, 23 Mar 2009 01:22:24 +1030 | From | David Newall <> | Subject | Re: df -h shows ~10 times bigger size when umounting pendrive |
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Arkadiusz Miskiewicz wrote: > /etc/mtab contains: > > /dev/sdb1 /media/floppy vfat rw 0 0 > > statfs() returns: > > statfs("/media/floppy", {f_type=0x58465342, f_bsize=4096, f_blocks=2497555, > f_bfree=1410716, f_bavail=1410716, f_files=10000448, f_ffree=9842679, > f_fsid={2051, 0}, f_namelen=255, f_frsize=4096}) = 0 >
The statfs(), above, is not a stat for the file system at /media/floppy, it's a stat for the file system which *contains* /media/floppy. If /dev/sdb1 has been unmounted (which was in fact in occurring at the time) the stat refers to (in your case) the root filesystem. And look at the returned information: 2497555 4K blocks, 1410716 of them available; that's 9.6GB file system with 5.5GB available, same as /dev/sda3.
Truly, this is what I said it was; and it's normal, and it's reasonable.
> /dev/sdb1 9,6G 4,2G 5,4G 44% /media/floppy > > So why statfs() lies on a being unmounted filesystem?
There is a lie, which is that /media/floppy is on /dev/sdb1. That ceases to be true as soon as the umount starts. The reason df lies is because it trusts the mtab, which has not yet had the entry for /dev/sdb1 removed.
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