嵌入式linux实现即插即用（热插拔）USB盘问题

如果我要实现即插即用（热插拔）USB盘，我还需要怎么做谢谢高手们指点。
下面是我已经实现的功能和打印信息：
BusyBox v1.2.1 (2007.09.12-03:35+0000) Built-in shell (ash)
Enter 'help' for a list of built-in commands.

~ # usb 1-1: new full speed USB device using ppc-soc-ohci and address 2  插入USB盘检测到的信息
usb 1-1: configuration #1 chosen from 1 choice
scsi0 : SCSI emulation for USB Mass Storage devices
scsi 0:0:0:0: Direct-Access     Hitachi  HTS541280H9AT00  0000 PQ: 0 ANSI: 0
SCSI device sda: 156301488 512-byte hdwr sectors (80026 MB)
sda: Write Protect is off
sda: assuming drive cache: write through
SCSI device sda: 156301488 512-byte hdwr sectors (80026 MB)
sda: Write Protect is off
sda: assuming drive cache: write through
sda: sda1 sda2
sd 0:0:0:0: Attached scsi disk sda
ls
bin          home         linuxrc      opt          sbin         var
dev          lib          lost+found   proc         tmp
etc          license.txt  mnt          root         usr
~ # usb 1-1: USB disconnect, address 2                          拔出USB盘
usb 1-1: new full speed USB device using ppc-soc-ohci and address 3  再次插入USB盘信息，到这是不是说明我的USB盘已经具有热插拔功能了 ？
usb 1-1: configuration #1 chosen from 1 choice
scsi1 : SCSI emulation for USB Mass Storage devices
scsi 1:0:0:0: Direct-Access     Hitachi  HTS541280H9AT00  0000 PQ: 0 ANSI: 0
SCSI device sda: 156301488 512-byte hdwr sectors (80026 MB)
sda: Write Protect is off
sda: assuming drive cache: write through
SCSI device sda: 156301488 512-byte hdwr sectors (80026 MB)
sda: Write Protect is off
sda: assuming drive cache: write through
sda: sda1 sda2
sd 1:0:0:0: Attached scsi disk sda

~ #

/mnt/samba # mount /dev/sda2 /mnt/samba  这是我手动mount如果我要实现当检测到sda2时自动挂载到samba中，当拔出时自动卸载samba我该如何实现？？？？
/mnt/samba # cd samba
~ # cd /mnt/samba
/mnt/samba # ls
FAT: Filesystem panic (dev sda2)
    fat_get_cluster: invalid cluster chain (i_pos 0)
    File system has been set read-only
ls: ./schuang333: Input/output error
MiniNT        boot.ini      ibmbio.com    rexx.exe      tpplgm6.exe
Preboot       bootsect.dos  ibmdos.com    rxdinfo.rx    tpplgt1.exe
Recovery      command.com   launchit.bat  tpdiag.exe    tpplgt2.exe
Recycled      config.icr    ntdetect.com  tpdiag2.exe   tpplgw10.exe
Win51         config.sys    ntldr         tpplga10.exe  tpplgw11.exe
Win51IP       dos           pcycle.exe    tpplgd14.002  tptools
Win51IP.SP2   fcopy.ini     peldr         tpplgd14.exe  version.id
autoexec.bat  finddrv.bat   plnrchk.bat   tpplgd15.exe
autoexec.icr  himem.sys     psphd.done    tpplge3.exe

mnt/samba # cd ..
/mnt # cd ..
~ # usb 1-1: USB disconnect, address 3   
usb 1-1: new full speed USB device using ppc-soc-ohci and address 4
usb 1-1: configuration #1 chosen from 1 choice
scsi2 : SCSI emulation for USB Mass Storage devices
scsi 2:0:0:0: Direct-Access     Hitachi  HTS541280H9AT00  0000 PQ: 0 ANSI: 0
SCSI device sdb: 156301488 512-byte hdwr sectors (80026 MB)
sdb: Write Protect is off
sdb: assuming drive cache: write through
SCSI device sdb: 156301488 512-byte hdwr sectors (80026 MB)
sdb: Write Protect is off
sdb: assuming drive cache: write through
sdb: sdb1 sdb2
sd 2:0:0:0: Attached scsi disk sdb

~ # cd mnt
/mnt # cd samba
/mnt/samba # ls
scsi 1:0:0:0: rejecting I/O to dead device
scsi 1:0:0:0: rejecting I/O to dead device
FAT: Directory bread(block 20376) failed
scsi 1:0:0:0: rejecting I/O to dead device
FAT: Directory bread(block 20377) failed
scsi 1:0:0:0: rejecting I/O to dead device　　　　　　

你好.我首先挂载上去.如何卸载呢?就是不知道如何卸载,所以每次我都是直接拔出,就出现和你一样的问题.请你楼主你是如何解决你的问题呢?因为我遇到的问题和你一样.先谢谢了.