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DaGr8Gatzby
n00b
Joined: 18 Sep 2004
Posts: 40
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 Posted: Thu Nov 04, 2004 6:49 pm Post subject: USB Flash drive |
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I can get mine to work. I do have SCSI enabled and it seems to work fine. The thing is in my fstab file, I have a line that has it to mount the drive. However, it becomes pointless because when I first plug in the keychain it appears as /dev/sdab and /dev/sdb1. here is the exact line in my fstab
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/dev/sdb1 /mnt/keychain vfat,ext3 defaults,noauto,sync,users 0 0
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Obviously that line works. I'm not complaining. But then lets say I remove the device. I leave for work or whatever. I then come back and plug it back in and the device it shows is /dev/sdc and /dev/sdc1. Is there a workaround for this? |
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Naib
Watchman
Joined: 21 May 2004
Posts: 6069
Location: Removed by Neddy
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| Posted: Thu Nov 04, 2004 7:13 pm Post subject: |
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yes there is!!!
sounds like you are using devfs or a static dev.
This is why devFS was dropped. for dynamic devices there was no way of conveniently tying a /dev entry to a particular device.
udev solves this problem by allow user rules (for the creation of /dev nodes) to be written
This is my user udev rule:
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jrb@Fluid ~ $ cat /etc/udev/rules.d/10-local.rules
############################
# Local Machine Udev rules #
############################
BUS="scsi", KERNEL="sd*", SYSFS(serial)="B8177840FE1CB499", NAME="%k", SYMLINK="usbkey"
BUS="usb", SYSFS{serial}="509DLT", NAME="usb/%k", SYMLINK="canon_i550"
KERNEL="mice", NAME="input/%k", SYMLINK="usbmouse"
KERNEL="js*", NAME="input/%k", SYMLINK="%k"
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As you can see from this it creates (based on my USB sticks serial number, udev has a prog to find this out) a device called "sd*" so this could be sda1, sdb2.... BUT it also makes a symlink called "usbkey", this will always be linked to the correct /dev entry, since it is created at the creation of /dev/sd*
I also have an entry for the creationof my USB printer to produce a more convineient name.
Final two are just house keeping for two nodes that are created and I wnat more useful symlinks.
Have fun |
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Bepcyc
Tux's lil' helper
Joined: 07 May 2004
Posts: 130
Location: Moscow, Russia
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| Posted: Thu Nov 04, 2004 7:22 pm Post subject: |
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Use udev, here's a line I added to my /etc/udev/rules.d/50-udev.rules:
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KERNEL="sd[a-e][1-9]" NAME="%k" SYMLINK="flash/flash%e"
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Now I see first flash as /dev/flash/flash, second as /dev/flash/flash1 etc.
If you want to see the device file for current flash unchangeable that try to use the sysfs advantages
For example, this is how I made the link for my cdrom
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BUS="scsi", SYSFS{vendor}="QSI", SYSFS{model}="CDRW/DVD SBW-242", SYMLINK="cdrom"
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It's not difficult to change it for your flash drive, just explore the sysfs ;)
it may be also useful fot you to look for
Guess, you found the answer to your question |
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DaGr8Gatzby
n00b
Joined: 18 Sep 2004
Posts: 40
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| Posted: Fri Nov 05, 2004 7:28 pm Post subject: |
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| I got it guys....thanks for all your help. I kind of had a little trouble with Udev but I worked at it. And also at first my rule wasn't working for my keychain. But I just added the KERNEL=sd* option and it worked. Thanks. Sorry if that was a newbie question I'm coming from FreeBSD. |
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