linux-kernel - df -h shows ~10 times bigger size when umounting pendrive

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Message-Id: <200903220150.16004.a.miskiewicz@gmail.com>
Date:	Sun, 22 Mar 2009 01:50:15 +0100
From:	Arkadiusz Miskiewicz <a.miskiewicz@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: df -h shows ~10 times bigger size when umounting pendrive


I have 1GiB pendrive:

[ 1494.641661] scsi 4:0:0:0: Direct-Access              GOODDRIVE        1100 
PQ: 0 ANSI: 0 CCS
[ 1494.643482] sd 4:0:0:0: [sdb] 1957888 512-byte hardware sectors: (1.00 
GB/956 MiB)
[ 1494.644599] sd 4:0:0:0: [sdb] Write Protect is off
[ 1494.644604] sd 4:0:0:0: [sdb] Mode Sense: 43 00 00 00
[ 1494.644609] sd 4:0:0:0: [sdb] Assuming drive cache: write through
[ 1494.647107] sd 4:0:0:0: [sdb] 1957888 512-byte hardware sectors: (1.00 
GB/956 MiB)
[ 1494.648224] sd 4:0:0:0: [sdb] Write Protect is off
[ 1494.648230] sd 4:0:0:0: [sdb] Mode Sense: 43 00 00 00
[ 1494.648234] sd 4:0:0:0: [sdb] Assuming drive cache: write through
[ 1494.648241]  sdb: sdb1
[ 1494.657345] sd 4:0:0:0: [sdb] Attached SCSI removable disk
[ 1494.657564] sd 4:0:0:0: Attached scsi generic sg2 type 0
[ 1494.658212] usb-storage: device scan complete

pendrive was mounted on /media/floppy

[arekm@...0 ~]$ df -h
System plik�w         rozm. u�yte dost. %u�. zamont. na
/dev/sda3             9,6G  4,2G  5,5G  44% /          
/dev/mapper/home      127G   52G   75G  42% /home      
tmpfs                 1,0G   28K  1,0G   1% /tmp       
none                  2,0G   12K  2,0G   1% /dev/shm   
/dev/sdb1             956M  657M  299M  69% /media/floppy

then I copied 650MB file and run umount /media/floppy

While umount was running and data were synced on the
pendrive df -h showed:

[arekm@...0 ~]$ df -h
System plik�w         rozm. u�yte dost. %u�. zamont. na
/dev/sda3             9,6G  4,2G  5,5G  44% /
/dev/mapper/home      127G   52G   75G  42% /home
tmpfs                 1,0G   28K  1,0G   1% /tmp
none                  2,0G   12K  2,0G   1% /dev/shm
/dev/sdb1             9,6G  4,2G  5,5G  44% /media/floppy


So it started to show 9.6G size when in process of umount.

Doesn't sound "normal" and correct.

[arekm@...0 ~]$ uname -a
Linux t400 2.6.29-rc8 #105 SMP Sun Mar 22 00:47:52 CET 2009 x86_64 
Intel(R)_Core(TM)2_Duo_CPU_____T9400__@...53GHz PLD Linux

(actually from git from about 1 hour ago)
-- 
Arkadiusz Miśkiewicz        PLD/Linux Team
arekm / maven.pl            http://ftp.pld-linux.org/


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