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From: rkreiner@sbox.tu-graz.ac.at
Message-ID: <3A44DEE4.2D94574F@sbox.tu-graz.ac.at>
Date: Sat, 23 Dec 2000 18:20:36 +0100
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To: linux-kernel@vger.kernel.org, torvalds@transmeta.com
Subject: PROBLEM: multiple mount of devices possible 2.4.0-test1 - 
 2.4.0-test13-pre4
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1. multiple mount of devices possible 2.4.0-test1 - 2.4.0-test13-pre4

2. its still possible to mount devices several times.
   IMHO it shouldnt be possible like 2.2.18
   with umount in /proc/mounts is still the real information,
   in /etc/mtab all corresponding mountpoints are deleted.

3. kernel, filesystem, mount

4. Linux version 2.4.0-test13-pre4 (root@apollo) (gcc version 2.95.2
19991024 (release)) #1 SMP Sat Dec 23 17:04:07 CET 2000

5. none

6. example
   #!/bin/sh
   mount /dev/hda2 /gate
   mount -t nfs gate:/ /gate
   mount -t nfs gate:/ /gate
   mount /dev/hda2 /mnt

7. 

7.1
-- Versions installed: (if some fields are empty or look
-- unusual then possibly you have very old versions)
Linux apollo 2.4.0-test13-pre4 #1 SMP Sat Dec 23 17:04:07 CET 2000 i586
unknown
Kernel modules         2.3.11
Gnu C                  2.95.2
Gnu Make               3.79.1
Binutils               2.9.5.0.24
Linux C Library        x   1 root     root      4070406 Jul 30 21:41
/lib/libc.so.6
Dynamic linker         ldd (GNU libc) 2.1.3
Procps                 2.0.6
Mount                  2.10m
Net-tools              1.56
Kbd                    0.99
Sh-utils               2.0
Modules Loaded         

7.2
processor	: 0
vendor_id	: AuthenticAMD
cpu family	: 5
model		: 8
model name	: AMD-K6(tm) 3D processor
stepping	: 12
cpu MHz		: 400.906
cache size	: 64 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 mce cx8 pge mmx syscall 3dnow k6_mtrr
bogomips	: 799.54

7.3

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
0213-0213 : isapnp read
02f8-02ff : serial(auto)
0376-0376 : ide1
0378-037a : parport0
03c0-03df : vga+
03f6-03f6 : ide0
03f8-03ff : serial(auto)
0a79-0a79 : isapnp write
0cf8-0cff : PCI conf1
5c20-5c3f : Acer Laboratories Inc. [ALi] M7101 PMU
d000-d00f : Acer Laboratories Inc. [ALi] M5229 IDE
d400-d43f : Ensoniq ES1371 [AudioPCI-97]
  d400-d43f : es1371
d800-d8ff : Realtek Semiconductor Co., Ltd. RTL-8139
  d800-d8ff : eth0

00000000-0009fbff : System RAM
0009fc00-0009ffff : reserved
000a0000-000bffff : Video RAM area
000c0000-000c7fff : Video ROM
000f0000-000fffff : System ROM
00100000-07ffbfff : System RAM
  00100000-002ef4af : Kernel code
  002ef4b0-0031193f : Kernel data
07ffc000-07ffefff : ACPI Tables
07fff000-07ffffff : ACPI Non-volatile Storage
de000000-de0000ff : Realtek Semiconductor Co., Ltd. RTL-8139
  de000000-de0000ff : eth0
df000000-dfffffff : PCI Bus #01
  df000000-df7fffff : Matrox Graphics, Inc. MGA G400 AGP
  df800000-df803fff : Matrox Graphics, Inc. MGA G400 AGP
e0000000-e3ffffff : Acer Laboratories Inc. [ALi] M1541
e5f00000-e7ffffff : PCI Bus #01
  e6000000-e7ffffff : Matrox Graphics, Inc. MGA G400 AGP
ffff0000-ffffffff : reserved

7.5
00:00.0 Host bridge: Acer Laboratories Inc. [ALi] M1541 (rev 04)
	Subsystem: Acer Laboratories Inc. [ALi] ALI M1541 Aladdin V/V+ AGP
System Controller
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
	Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=slow >TAbort- <TAbort-
<MAbort+ >SERR- <PERR-
	Latency: 64
	Region 0: Memory at e0000000 (32-bit, non-prefetchable) [size=64M]
	Capabilities: [b0] AGP version 1.0
		Status: RQ=28 SBA+ 64bit- FW- Rate=x1,x2
		Command: RQ=0 SBA- AGP- 64bit- FW- Rate=<none>

00:01.0 PCI bridge: Acer Laboratories Inc. [ALi] M5243 (rev 04) (prog-if
00 [Normal decode])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
	Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=slow >TAbort- <TAbort-
<MAbort- >SERR- <PERR-
	Latency: 64
	Bus: primary=00, secondary=01, subordinate=01, sec-latency=64
	I/O behind bridge: 0000e000-0000dfff
	Memory behind bridge: df000000-dfffffff
	Prefetchable memory behind bridge: e5f00000-e7ffffff
	BridgeCtl: Parity- SERR- NoISA- VGA+ MAbort- >Reset- FastB2B-

00:03.0 Bridge: Acer Laboratories Inc. [ALi] M7101 PMU
	Subsystem: Acer Laboratories Inc. [ALi] ALI M7101 Power Management
Controller
	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-

00:07.0 ISA bridge: Acer Laboratories Inc. [ALi] M1533 PCI to ISA Bridge
[Aladdin IV] (rev c3)
	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

00:09.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139
(rev 10)
	Subsystem: Realtek Semiconductor Co., Ltd. RT8139
	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 (8000ns min, 16000ns max)
	Interrupt: pin A routed to IRQ 9
	Region 0: I/O ports at d800 [size=256]
	Region 1: Memory at de000000 (32-bit, non-prefetchable) [size=256]
	Capabilities: [50] Power Management version 2
		Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA
PME(D0-,D1+,D2+,D3hot+,D3cold+)
		Status: D0 PME-Enable+ DSel=0 DScale=0 PME-

00:0b.0 Multimedia audio controller: Ensoniq ES1371 [AudioPCI-97] (rev
06)
	Subsystem: Ensoniq Creative Sound Blaster AudioPCI64V, AudioPCI128
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
	Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=slow >TAbort- <TAbort-
<MAbort- >SERR- <PERR-
	Latency: 32 (3000ns min, 32000ns max)
	Interrupt: pin A routed to IRQ 10
	Region 0: I/O ports at d400 [size=64]
	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-

00:0f.0 IDE interface: Acer Laboratories Inc. [ALi] M5229 IDE (rev c1)
(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 (500ns min, 1000ns max)
	Interrupt: pin A routed to IRQ 0
	Region 4: I/O ports at d000 [size=16]

01:00.0 VGA compatible controller: Matrox Graphics, Inc. MGA G400 AGP
(rev 03) (prog-if 00 [VGA])
	Subsystem: Matrox Graphics, Inc. Millennium G400 16Mb 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: 64 (4000ns min, 8000ns max), cache line size 08
	Interrupt: pin A routed to IRQ 11
	Region 0: Memory at e6000000 (32-bit, prefetchable) [size=32M]
	Region 1: Memory at df800000 (32-bit, non-prefetchable) [size=16K]
	Region 2: Memory at df000000 (32-bit, non-prefetchable) [size=8M]
	Expansion ROM at e5ff0000 [disabled] [size=64K]
	Capabilities: [dc] 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-
	Capabilities: [f0] AGP version 2.0
		Status: RQ=31 SBA+ 64bit- FW- Rate=x1,x2
		Command: RQ=31 SBA+ AGP+ 64bit- FW- Rate=x1

7.6

7.7
Mount Version:
mount: mount-2.10m

Output of /proc/mounts:
/dev/root / ext2 rw 0 0
proc /proc proc rw 0 0
/dev/hda7 /home ext2 rw 0 0
/dev/hda9 /data vfat rw 0 0
/dev/hda8 /datax vfat rw 0 0
/dev/hda10 /data2 vfat rw 0 0
/dev/hdb1 /data3 vfat rw 0 0
/dev/hda3 /win98 vfat rw 0 0
/dev/hda6 /redhat ext2 rw 0 0
/dev/hda11 /sicher ext2 ro 0 0
/dev/hda13 /sicher2 ext2 ro 0 0
/dev/hdb6 /sicher3 ext2 rw 0 0
devpts /dev/pts devpts rw 0 0
/dev/hda2 /gate vfat rw 0 0
gate:/ /gate nfs rw,v2,rsize=8192,wsize=8192,hard,udp,lock,addr=gate 0 0
gate:/ /gate nfs rw,v2,rsize=8192,wsize=8192,hard,udp,lock,addr=gate 0 0
/dev/hda2 /mnt vfat rw 0 0

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