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Subjectbug report: loopback device
[1.]
Unmounting a loopback file system doesn't save the changes in the file

[2.]
I mount a file "ext2.flp" under /floppy as an ext2 file system, copy
a file "u3core.bin" to /floppy.

If I list /floppy, u3core.bin shows up.

umount /floppy. ls /floppy, u3core.bin does not show up, as expected.

mount ext2.flp under /floppy and list the files, u3core.bin isn't there.
The file system was never saved back on disk at unmount.

[3.]
loopback, ext2, umount

[4.]
Linux version 2.4.15-greased-turkey (root@void-core) (gcc version
2.95.4 20011006 (Debian prerelease)) #3 Sat Nov 24 13:57:18 EST 2001

[5.]
Not applicable

[6.]
#! /bin/sh

dd if=/dev/zero of=ext2.flp bs=512 count=2880
mke2fs ext2.flp
mount -o loop ext2.flp /floppy
echo "hello!" > myfile.txt
cp myfile.txt /floppy
echo "Listing of mounted /floppy:"
ls /floppy
umount /floppy
echo "Listing of unmounted /floppy:"
ls /floppy
mount -o loop ext2.flp /floppy
echo "Listing of re-mounted /floppy:"
ls /floppy
umount /floppy

[7.]
[7.1.]
Linux void-core 2.4.15-greased-turkey #3 Sat Nov 24 13:57:18 EST 2001
i686 unknown

Gnu C 2.95.4
Gnu make 3.79.1
util-linux 2.11m
mount 2.11m
modutils 2.4.11
e2fsprogs 1.25
Linux C Library 2.2.4
Dynamic linker (ldd) 2.2.4
Procps 2.0.7
Net-tools 1.60
Console-tools 0.2.3
Sh-utils 2.0.11
Modules Loaded NVdriver

[7.2.]
processor : 0
vendor_id : AuthenticAMD
cpu family : 6
model : 4
model name : AMD Athlon(tm) Processor
stepping : 2
cpu MHz : 807.195
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca
cmov pat pse36 mmx fxsr syscall mmxext 3dnowext 3dnow
bogomips : 1608.90

[7.3.]
NVdriver 717888 14 (autoclean)

[7.4.]
0000-001f : dma1
0020-003f : pic1
0040-005f : timer
0060-006f : keyboard
0080-008f : dma page reg
00a0-00bf : pic2
00c0-00df : dma2
00f0-00ff : fpu
0170-0177 : ide1
01f0-01f7 : ide0
02f8-02ff : serial(set)
0376-0376 : ide1
03c0-03df : vga+
03f6-03f6 : ide0
03f8-03ff : serial(set)
0cf8-0cff : PCI conf1
9400-947f : 3Com Corporation 3c900B-TPO [Etherlink XL TPO]
9400-947f : 00:0d.0
9800-98ff : VIA Technologies, Inc. Ethernet Controller
9800-98ff : via-rhine
a000-a007 : Creative Labs SB Live!
a400-a41f : Creative Labs SB Live! EMU10k1
a400-a41f : EMU10K1
d000-d01f : VIA Technologies, Inc. UHCI USB (#2)
d000-d01f : usb-uhci
d400-d41f : VIA Technologies, Inc. UHCI USB
d400-d41f : usb-uhci
d800-d80f : VIA Technologies, Inc. Bus Master IDE
d800-d807 : ide0
d808-d80f : ide1
e400-e4ff : VIA Technologies, Inc. VT82C686 [Apollo Super ACPI]
e800-e80f : VIA Technologies, Inc. VT82C686 [Apollo Super ACPI]

00000000-0009fbff : System RAM
0009fc00-0009ffff : reserved
000a0000-000bffff : Video RAM area
000c0000-000c7fff : Video ROM
000f0000-000fffff : System ROM
00100000-17febfff : System RAM
00100000-002532c5 : Kernel code
002532c6-002baff7 : Kernel data
17fec000-17feefff : ACPI Tables
17fef000-17ffefff : reserved
17fff000-17ffffff : ACPI Non-volatile Storage
d5000000-d500007f : 3Com Corporation 3c900B-TPO [Etherlink XL TPO]
d5800000-d58000ff : VIA Technologies, Inc. Ethernet Controller
d5800000-d58000ff : via-rhine
d6000000-d7dfffff : PCI Bus #01
d6000000-d6ffffff : nVidia Corporation GeForce 256 DDR
d7f00000-e3ffffff : PCI Bus #01
d8000000-dfffffff : nVidia Corporation GeForce 256 DDR
e4000000-e7ffffff : VIA Technologies, Inc. VT8363/8365 [KT133/KM133]
ffff0000-ffffffff : reserved

[7.5.]
00:00.0 Host bridge: VIA Technologies, Inc. VT8363/8365 [KT133/KM133] (rev 02)
Subsystem: Asustek Computer, Inc.: Unknown device 8033
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort+ >SERR- <PERR-
Latency: 0
Region 0: Memory at e4000000 (32-bit, prefetchable) [size=64M]
Capabilities: [a0] AGP version 2.0
Status: RQ=31 SBA+ 64bit- FW+ Rate=x1,x2
Command: RQ=0 SBA- AGP- 64bit- FW- Rate=<none>
Capabilities: [c0] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:01.0 PCI bridge: VIA Technologies, Inc. VT8363/8365 [KT133/KM133 AGP] (prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort+ >SERR- <PERR-
Latency: 0
Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
I/O behind bridge: 0000e000-0000dfff
Memory behind bridge: d6000000-d7dfffff
Prefetchable memory behind bridge: d7f00000-e3ffffff
BridgeCtl: Parity- SERR- NoISA- VGA+ MAbort- >Reset- FastB2B-
Capabilities: [80] Power Management version 2
Flags: PMEClk- DSI+ D1+ D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:04.0 ISA bridge: VIA Technologies, Inc. VT82C686 [Apollo Super South] (rev 22)
Subsystem: Asustek Computer, Inc.: Unknown device 8033
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping+ SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0

00:04.1 IDE interface: VIA Technologies, Inc. Bus Master IDE (rev 10) (prog-if 8a [Master SecP PriP])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 32
Region 4: I/O ports at d800 [size=16]
Capabilities: [c0] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:04.2 USB Controller: VIA Technologies, Inc. UHCI USB (rev 10) (prog-if 00 [UHCI])
Subsystem: Unknown device 0925:1234
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 32, cache line size 08
Interrupt: pin D routed to IRQ 9
Region 4: I/O ports at d400 [size=32]
Capabilities: [80] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:04.3 USB Controller: VIA Technologies, Inc. UHCI USB (rev 10) (prog-if 00 [UHCI])
Subsystem: Unknown device 0925:1234
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 32, cache line size 08
Interrupt: pin D routed to IRQ 9
Region 4: I/O ports at d000 [size=32]
Capabilities: [80] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:04.4 Host bridge: VIA Technologies, Inc. VT82C686 [Apollo Super ACPI] (rev 30)
Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Interrupt: pin ? routed to IRQ 9
Capabilities: [68] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:0a.0 Multimedia audio controller: Creative Labs SB Live! EMU10k1 (rev 07)
Subsystem: Creative Labs CT4832 SBLive! Value
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 32 (500ns min, 5000ns max)
Interrupt: pin A routed to IRQ 5
Region 0: I/O ports at a400 [size=32]
Capabilities: [dc] Power Management version 1
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:0a.1 Input device controller: Creative Labs SB Live! (rev 07)
Subsystem: Creative Labs Gameport Joystick
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 32
Region 0: I/O ports at a000 [size=8]
Capabilities: [dc] Power Management version 1
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:0b.0 Ethernet controller: VIA Technologies, Inc. Ethernet Controller (rev 43)
Subsystem: D-Link System Inc: Unknown device 1400
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping+ SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 32 (750ns min, 2000ns max), cache line size 08
Interrupt: pin A routed to IRQ 10
Region 0: I/O ports at 9800 [size=256]
Region 1: Memory at d5800000 (32-bit, non-prefetchable) [size=256]
Expansion ROM at <unassigned> [disabled] [size=64K]
Capabilities: [40] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:0d.0 Ethernet controller: 3Com Corporation 3c900B-TPO [Etherlink XL TPO] (rev 04)
Subsystem: 3Com Corporation 3C900B-TPO Etherlink XL TPO 10Mb
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 32 (2500ns min, 12000ns max), cache line size 08
Interrupt: pin A routed to IRQ 9
Region 0: I/O ports at 9400 [size=128]
Region 1: Memory at d5000000 (32-bit, non-prefetchable) [size=128]
Expansion ROM at <unassigned> [disabled] [size=128K]
Capabilities: [dc] Power Management version 1
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1+,D2+,D3hot+,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

01:00.0 VGA compatible controller: nVidia Corporation GeForce 256 DDR (rev 10) (prog-if 00 [VGA])
Subsystem: Asustek Computer, Inc. AGP-V6800 DDR SGRAM
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 248 (1250ns min, 250ns max)
Interrupt: pin A routed to IRQ 11
Region 0: Memory at d6000000 (32-bit, non-prefetchable) [size=16M]
Region 1: Memory at d8000000 (32-bit, prefetchable) [size=128M]
Expansion ROM at d7ff0000 [disabled] [size=64K]
Capabilities: [60] Power Management version 1
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [44] AGP version 2.0
Status: RQ=31 SBA- 64bit- FW+ Rate=x1,x2
Command: RQ=0 SBA- AGP- 64bit- FW- Rate=<none>

[7.6.]
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: PLEXTOR Model: CD-R PX-W8432T Rev: 1.05
Type: CD-ROM ANSI SCSI revision: 02

[7.7.]
None

[X.]
Output of the provided script:

ext2.flp is not a block special device.
Proceed anyway? (y,n) y
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
184 inodes, 1440 blocks
72 blocks (5.00%) reserved for the super user
First data block=1
1 block group
8192 blocks per group, 8192 fragments per group
184 inodes per group

Writing inode tables: 0/1
done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 29 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
Listing of mounted /floppy:
lost+found
myfile.txt
Listing of unmounted /floppy:
Listing of re-mounted /floppy:
lost+found

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