Mounting custom fs ?

Raynus · 09-16-2008, 04:25 AM

Good evening, guys

i've followed this tutorial , its to create a simple fs

http://www.geocities.com/ravikiran_u...cles/rkfs.html

well, the source is quite outdate for my kernel 2.6.25.11 API

After correcting the code ,My fs module intialized and register filesystem successfully .

and cat /proc/filesystems have my fs name inside , with "nodev"

My problem is....

When i am trying to mount the fs (named "rkfs"), with following command,

mount -t rkfs none /mnt/rkfs_mount

(The command wrote in above tutorial, at final step)

the error was

mount: special device none does not exist

since it was a custom fs , so i have no idea how can i take some "device"

to making a mount

even i try create loopback device and mounted , it return "Segment fault"

Any ideas ?

Ma Peche · 09-16-2008, 07:07 PM

Can you use mkfs to make the filesystem?
if so, a loopback device setup could work something like

Code:

dd if=/dev/zero of=/myfs bs=1k count=100 #makes a file with all zeroes
losetup -a # this will show you which loopback devices are in use
# if it doesn't print anything you can use loop0, otherwise use the first free one
losetup /dev/loop0 /myfs  #make the loopback device
mkfs -t rkfs /dev/loop0 100 #format it to your fs
mount -t rkfs /dev/loop0 /mnt #mount it

hope this helps

Raynus · 09-16-2008, 08:57 PM

Unluckily , its return as following.

mkfs -t rkfs /dev/loop0 100
mkfs.rkfs: No such file or directory

mount -t rkfs /dev/loop0 /mnt #mount it
Segmentation fault

Ma Peche · 09-17-2008, 02:31 AM

Was there any messages printed when you compiled the module or when you installed it (the `make` and `insmod` commands respectively)?

Raynus · 09-17-2008, 02:50 AM

Neither Error and Warning issue.

Cedalion:/home/raynus/my_dev/module/blk# make
make -C /lib/modules/2.6.25.11/build M=/home/raynus/my_dev/module/blk modules
make[1]: Entering directory `/usr/src/linux-2.6.25.11'
Building modules, stage 2.
MODPOST 1 modules
LD [M] /home/raynus/my_dev/module/blk/rkfs2.ko
make[1]: Leaving directory `/usr/src/linux-2.6.25.11'
Cedalion:/home/raynus/my_dev/module/blk#

Cedalion:/home/raynus/my_dev/module/blk# insmod rkfs2.ko
Cedalion:/home/raynus/my_dev/module/blk#

And register_filesystem return 0.