[Solved] mounting Linux FS

hirohitosan · #1 December 9th, 2008, 14:45

Hi there.
I completed the installation of FreeBSD on my comp.

My computer has 2 HDD. On the first HDD I have Ubuntu and I think but not sure that has ext3 FS.

I created the mount point an try some:

Code:

# fdisk -l
fdisk: illegal option -- l
usage: fdisk [-BIaipstu] [-b bootcode] [-1234] [disk]
       fdisk -f configfile [-itv] [disk]

and

Code:

# # ls /dev/
acd0            cuad0.init      kbdmux0         stdout          ttyvb
acpi            cuad0.lock      klog            sysmouse        ttyvc
ad6             cuad1           kmem            ttyd0           ttyvd
ad6s1           cuad1.init      log             ttyd0.init      ttyve
ad6s2           cuad1.lock      mdctl           ttyd0.lock      ttyvf
ad6s5           dcons           mem             ttyd1           ukbd0
ad8             devctl          net             ttyd1.init      ums0
ad8s1           devstat         net1            ttyd1.lock      urandom
ad8s1a          dgdb            net2            ttyp0           usb
ad8s1b          dumpdev         net3            ttyp1           usb0
ad8s1c          fd              net4            ttyv0           usb1
ad8s1d          fido            network         ttyv1           usb2
ad8s1e          fw0             nfs4            ttyv2           usb3
ad8s1f          fw0.0           nfslock         ttyv3           usb4
ata             fwmem0          null            ttyv4           usb5
atkbd0          fwmem0.0        pci             ttyv5           usb6
audit           geom.ctl        ptyp0           ttyv6           usb7
console         io              ptyp1           ttyv7           xpt0
consolectl      kbd0            random          ttyv8           zero
ctty            kbd1            stderr          ttyv9
cuad0           kbd2            stdin           ttyva

How can I mount the Linux HDD and where is in /dev?
it is ad6, ad6s1, ad6s2, ad6s5?

thanks

Ole · #2 December 9th, 2008, 14:55

for view slices and partition type:

fdisk -p /dev/ad6
and then

Code:

mount -o ro -t ext2fs /dev/ad6s1 /mnt
or
mount -o ro -t ext2fs /dev/ad6s2 /mnt

**SirDice** · #3 December 9th, 2008, 14:56

Try fdisk ad6 and fdisk ad8. That should show you the ext3 partition. If it's on the first disk it's probably ad6s1.

hirohitosan · #4 December 9th, 2008, 15:29

Code:

# fdisk -p /dev/ad6                      
# /dev/ad6                                      
g c969021 h16 s63                               
p 1 0x83 63 953409492                           
a 1                                             
p 2 0x05 953409555 23358510

and

Code:

# fdisk ad6
******* Working on device /dev/ad6 *******
parameters extracted from in-core disklabel are:
cylinders=969021 heads=16 sectors/track=63 (1008 blks/cyl)

Figures below won't work with BIOS for partitions not in cyl 1
parameters to be used for BIOS calculations are:              
cylinders=969021 heads=16 sectors/track=63 (1008 blks/cyl)    

Media sector size is 512
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:                 
The data for partition 1 is:                       
sysid 131 (0x83),(Linux native)                    
    start 63, size 953409492 (465531 Meg), flag 80 (active)
        beg: cyl 0/ head 1/ sector 1;
        end: cyl 1023/ head 254/ sector 63
The data for partition 2 is:
sysid 5 (0x05),(Extended DOS)
    start 953409555, size 23358510 (11405 Meg), flag 0
        beg: cyl 1023/ head 254/ sector 63;
        end: cyl 1023/ head 254/ sector 63
The data for partition 3 is:
<UNUSED>
The data for partition 4 is:
<UNUSED>

I suppose that the disk ad6 has 2 partitions, one is ext2fs and the other is swap
So I suppose
ad6s1 is the root / partition with ext2fs
ad6s2 is the swap partition
ad6s5 .... I don't know

hirohitosan · #5 December 9th, 2008, 16:05

well I tried:

Code:

# mount -o ro -t ext2fs /dev/ad6s1 /disc01/
# ls /disc01
ls: /disc01: Bad file descriptor
# mount -o ro -t ext2fs /dev/ad6s2 /disc01/
mount: /disc01: Bad file descriptor

where is the problem?

adamk · #6 December 9th, 2008, 16:10

You need to apply this patch to your kernel sources and rebuild at least the ext2fs kernel module:

http://pastebin.ca/raw/1280738

The ext2fs kernel module currently available in -STABLE (and maybe -CURRENT) does not support inode sizes higher than 128, and many distributions now use 256.

Adam

hirohitosan · #7 December 9th, 2008, 16:12

well after this I could not read the /disc01 directory (I created for mount point) so I restarted the system. A lot of numbers appear on the screen and finally "Giving up on 27 buffers". What does it means?

hirohitosan · #8 December 9th, 2008, 16:16

Quote:

Originally Posted by adamk

You need to apply this patch to your kernel sources and rebuild at least the ext2fs kernel module:

http://pastebin.ca/raw/1280738

I never apply apatch to the kernel and I don't know how to do it. Can you give my some hints?

Thanks

**brd@** · #9 December 9th, 2008, 16:52

Quote:

Originally Posted by adamk

You need to apply this patch to your kernel sources and rebuild at least the ext2fs kernel module:

http://pastebin.ca/raw/1280738

The ext2fs kernel module currently available in -STABLE (and maybe -CURRENT) does not support inode sizes higher than 128, and many distributions now use 256.

Adam

Is there a PR that references this patch?

gnemmi · #10 December 9th, 2008, 17:28

Yes there is brd@ you can find it in here:

http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/124621

Here you can find the patch that I used:

http://pflog.net/~floyd/ext2fs.diff

More on this topic:

mounting linux partitions
Fri May 9 18:05:26 UTC 2008
http://lists.freebsd.org/pipermail/f...ay/174588.html

bad file descriptor when mounting an ext2fs.
Tue Jun 10 11:08:46 UTC 2008
http://lists.freebsd.org/pipermail/f...ne/176506.html

mounting ext2fs partitions on FBSD7 ( third time a charm?)
Fri Jul 4 23:33:53 UTC 2008
http://lists.freebsd.org/pipermail/f...ly/178219.html

256-byte inode support
Sat Sep 6 23:46:33 UTC 2008
http://lists.freebsd.org/pipermail/f...er/025912.html

ext2 inode size patch - RE: PR kern/124621
Mon Nov 24 11:29:59 PST 2008
http://lists.freebsd.org/pipermail/f...er/046758.html

ext2 inode size patch - RE: PR kern/124621
Wed Dec 3 14:53:46 PST 2008
http://lists.freebsd.org/pipermail/f...er/046916.html

I´ve had a conversation with Josh (email) and he kindly explained me how to apply the patch and test it. So far, so _good_ to me ... not a single problem on daily usage.

Hope you find that info usefull

Regards

hirohitosan · #11 December 12th, 2008, 17:49

Reading the above links I don't understand if it's possible or not to mount Linux volumes.

All my information are in Linux volume and I don't know how to transfer them in FreeBSD.

I tried to mount the FreeBSD volume in Linux but no chance ...

gnemmi · #12 December 13th, 2008, 05:44

You can mount ext2/3fs as long as they have an "Inode size" equal to 128.

Otherwise (if "Inode size" equals 256), you won't be able to mount those ext2/3 partitions unless you apply Josh's patch. Or to be more spesific ... you will be able to mount them but you won't be able to acces the data on them .. and you'll get a "Bad file descriptor" every time you try to acces said mounted partition.

In order to find out whether your ext2/3 partitions have a 128 or a 256 "Inode size", issue the following command as root:

Code:

root@inferna:~ # tune2fs -l /dev/ad4s6 | grep "Inode size"
Inode size:               256

of course .. you will have to change "/dev/ad4s6" to the correct ext2/3 linux partition in your drive ...

At leas that was my experience ..

Hope that helps

hirohitosan · #13 December 13th, 2008, 10:29

Quote:

Originally Posted by gnemmi

In order to find out whether your ext2/3 partitions have a 128 or a 256 "Inode size", issue the following command as root:

Code:

root@inferna:~ # tune2fs -l /dev/ad4s6 | grep "Inode size"
Inode size:               256

well I tried

Code:

# tune2fs -l /dev/ad6s1 | grep "Inode size"
tune2fs: Command not found.
# whatis tune2fs
tune2fs: nothing appropriate

maybe I have to install something?

gnemmi · #14 December 13th, 2008, 10:33

Code:

[gonzalo@inferna ~]% which tune2fs
/usr/local/sbin/tune2fs
[gonzalo@inferna ~]% pkg_info -W /usr/local/sbin/tune2fs
/usr/local/sbin/tune2fs was installed by package e2fsprogs-1.41.3
[gonzalo@inferna ~]% pkg_info -xqo e2fsprogs
sysutils/e2fsprogs
[gonzalo@inferna ~]%

Hope it helps

hirohitosan · #15 December 13th, 2008, 12:06

Quote:

Originally Posted by gnemmi

Hope it helps

yes, it helps but unfortunately in my case:

Code:

 tune2fs -l /dev/ad6s1 | grep "Inode size"                              Inode size:               256

at this time as my system works I'm afraid to apply Josh's patch. I never apply a patch to my kernel sources and rebuild ... it's complicated?

Djn · #16 December 13th, 2008, 13:56

It's not too hard, really.
If you

Code:

# cd /usr/src/sys/gnu/fs
# patch < ~djn/ext2fs.diff  (change to where you stored the patch, obviously)
# cd /usr/src/sys/modules/ext2fs
# make install clean

This will compile and install the patched version of the ext2fs module. If it's already loaded you need to kldunload ext2fs; kldload ext2fs, otherwise you should just be able to kldload it and try.

If you have ext2fs compiled into the kernel (options EXT2FS) you would need to cd /usr/src ; make buildkernel installkernel to compile a new kernel. I doubt you have, though - it's not the default.

hirohitosan · #17 December 13th, 2008, 19:37

I don't have nothing in /usr/src

Code:

# ls -al /usr/src/
total 4
drwxr-xr-x   2 root  wheel  512 Feb 24  2008 .
drwxr-xr-x  17 root  wheel  512 Dec  9 10:02 ..

do I need something to install? the kernel sources or something like that?

gnemmi · #18 December 14th, 2008, 23:34

You need to install the sources first ..
You can do so using "sysinstall" ...

Code:

root@inferna:~ # sysinstall

Then go to "Configure" -> "Distributions", select (at least) "base" and "kernels" or go for "All" if you want to .. then hit "OK" and that should pretty much do it

You should check the Handbook first though ... it's been a while since I don't use "sysinstall" so I might be wrong :s

hirohitosan · #19 December 15th, 2008, 13:38

Quote:

Originally Posted by Djn

This will compile and install the patched version of the ext2fs module. If it's already loaded you need to kldunload ext2fs; kldload ext2fs, otherwise you should just be able to kldload it and try.

If you have ext2fs compiled into the kernel (options EXT2FS) you would need to cd /usr/src ; make buildkernel installkernel to compile a new kernel. I doubt you have, though - it's not the default.

I installed kernel sources and I downloaded ext2fs.diff and then:

Code:

# cd /usr/src/sys/gnu/fs/
# patch < ~/ext2fs.diff
Hmm...  Looks like a unified diff to me...     
The text leading up to this was:
--------------------------
|diff -ud ext2fs.orig/ext2_fs.h ext2fs/ext2_fs.h
|--- ext2fs.orig/ext2_fs.h      2005-06-16 06:51:38.000000000 +0000
|+++ ext2fs/ext2_fs.h   2008-09-03 14:10:27.000000000 +0000
--------------------------
Patching file ext2fs/ext2_fs.h using Plan A...
Hunk #1 succeeded at 150.
Hmm...  The next patch looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff -ud ext2fs.orig/ext2_inode.c ext2fs/ext2_inode.c
|--- ext2fs.orig/ext2_inode.c   2006-09-26 04:15:58.000000000 +0000
|+++ ext2fs/ext2_inode.c        2008-09-03 13:54:49.000000000 +0000
--------------------------
Patching file ext2fs/ext2_inode.c using Plan A...
Hunk #1 succeeded at 91.
Hmm...  The next patch looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff -ud ext2fs.orig/ext2_vfsops.c ext2fs/ext2_vfsops.c
|--- ext2fs.orig/ext2_vfsops.c  2008-04-03 18:51:13.000000000 +0000
|+++ ext2fs/ext2_vfsops.c       2008-09-03 13:55:37.000000000 +0000
--------------------------
Patching file ext2fs/ext2_vfsops.c using Plan A...
Hunk #1 succeeded at 424.
Hunk #2 succeeded at 578.
Hunk #3 succeeded at 1013.
done
# cd /usr/src/sys/modules/ext2fs/
# make install clean
install -o root -g wheel -m 555   ext2fs.ko /boot/kernel
install: ext2fs.ko: No such file or directory
*** Error code 71

something is missing? what went wrong?

gnemmi · #20 December 15th, 2008, 16:20

Try a:

Code:

root@inferna:/usr/src/sys/modules/ext2fs # make clean && make

a past the output in here.

hirohitosan · #21 December 15th, 2008, 21:36

I didn't understand the command so I paste it like this:

Code:

# /usr/src/sys/modules/ext2fs # make clean && make
/usr/src/sys/modules/ext2fs: Permission denied.

gnemmi · #22 December 16th, 2008, 02:24

are you doing this as root?
could you please do a "ls -a" inside that directory and paste the output in here?

**lme@** · #23 December 16th, 2008, 14:48

hirohitosan, you should exec this this as root:

Code:

# cd /usr/src/sys/modules/ext2fs
# make depend
# make obj
# make
# make install
# make unload
# make load

That way you build all dependencies for the module, build the module itself, install it, unload the current loaded module and load the new one.

hirohitosan · #24 December 16th, 2008, 15:16

Quote:

Originally Posted by lme@

hirohitosan, you should exec this this as root:

Code:

# cd /usr/src/sys/modules/ext2fs
# make depend
# make obj
# make
# make install
# make unload
# make load

That way you build all dependencies for the module, build the module itself, install it, unload the current loaded module and load the new one.

Thanks everything went well. Just

Code:

# make unload
/sbin/kldunload -v ext2fs.ko
kldunload: can't find file ext2fs.ko
*** Error code 1

Stop in /usr/src/sys/modules/ext2fs.
# make load
/sbin/kldload -v /usr/obj/usr/src/sys/modules/ext2fs/ext2fs.ko
Loaded /usr/obj/usr/src/sys/modules/ext2fs/ext2fs.ko, id=4

but I suppose that ext2fs was not loaded ....

hirohitosan · #25 December 16th, 2008, 16:04

thank you guys ... now I can mount the ext2 volume ... nice tutorial

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The Following 2 Users Say Thank You to gnemmi For This Useful Post:
hirohitosan (December 13th, 2008), nhanquy (July 25th, 2009)

The Following 2 Users Say Thank You to lme@ For This Useful Post:
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