Filesystem as a module?

Filesystem as a module?

[Vineet Joglekar]

Hi all,

I am trying to add some functionalities to ext2 filesystem, and use it as a module. Till now what I did is:
1: Copied the ext2 files and made the approprate changes
2: Copied files from usr/src/linux/fs/ directory
3: Copied relevant header files in /include/linux directory

The module gets compiled properly, but when I try to insert it using insmod, I am getting following errors like:

my_extv2.o: unresolved symbol generic_file_read_Rsmp_106b3732
my_extv2.o: unresolved symbol __get_free_pages_Rsmp_4784e424
my_extv2.o: unresolved symbol try_inc_mod_count_Rsmp_e6105b23
my_extv2.o: unresolved symbol blk_size_Rsmp_a2e0a082
my_extv2.o: unresolved symbol pidhash_Rsmp_4439d880
my_extv2.o: unresolved symbol floppy_eject
my_extv2.o: unresolved symbol smp_num_siblings

etc... and many more on the similar lines.

Whats wrong with my approach or do I need to add / modify few things?

Thanks and regards,

Vineet

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Re: Filesystem as a module?

[Jan-Benedict Glaw]

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On Fri, 2004-03-12 18:02:57 -0500, Vineet Joglekar <vintya@excite.com>
wrote in message <20040312230257.B06123DE6@xprdmailfe11.nwk.excite.com>:
> Hi all,
> 
> I am trying to add some functionalities to ext2 filesystem, and use it as a module. Till now what I did is:
> 1: Copied the ext2 files and made the approprate changes
> 2: Copied files from usr/src/linux/fs/ directory
> 3: Copied relevant header files in /include/linux directory

Better create another directory below ./linux/fs/ and place your sources
there.

> The module gets compiled properly, but when I try to insert it using insmod, I am getting following errors like:
> 
> my_extv2.o: unresolved symbol generic_file_read_Rsmp_106b3732
> my_extv2.o: unresolved symbol __get_free_pages_Rsmp_4784e424
> my_extv2.o: unresolved symbol try_inc_mod_count_Rsmp_e6105b23
> my_extv2.o: unresolved symbol blk_size_Rsmp_a2e0a082
> my_extv2.o: unresolved symbol pidhash_Rsmp_4439d880
> my_extv2.o: unresolved symbol floppy_eject
> my_extv2.o: unresolved symbol smp_num_siblings

You've mixed up your symbol versioning settings, most probably because
you're not building within the kernel's sources. That should all go away
automatically if you build within the kernel:)

> Whats wrong with my approach or do I need to add / modify few things?

Just copy all the sources back into the kernel tree and you're most
probably done.

MfG, JBG

-- 
   Jan-Benedict Glaw       jbglaw@lug-owl.de    . +49-172-7608481
   "Eine Freie Meinung in  einem Freien Kopf    | Gegen Zensur | Gegen Krieg
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Re: Filesystem as a module?

[Vineet Joglekar]

> Better create another directory below ./linux/fs/ and place your sources there.

Thanks for the prompt reply. I'll try to do it. I have 1 more question regarding this approach. In which make files do I need to make changes / additions so that while building the kernel, my newly added directory will be compiled too?

Thanks and regards

Vineet


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Re: Filesystem as a module?

[Jan-Benedict Glaw]

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On Sat, 2004-03-13 14:47:21 -0500, Vineet Joglekar <vintya@excite.com>
wrote in message <20040313194721.EB5123DC2@xprdmailfe6.nwk.excite.com>:
> > Better create another directory below ./linux/fs/ and place your sources there.
> 
> Thanks for the prompt reply. I'll try to do it. I have 1 more question regarding this approach. In which make files do I need to make changes / additions so that while building the kernel, my newly added directory will be compiled too?

Well, for 2.4.x, you'll need to touch ./linux/fs/Makefile,
./linux/fs/Config.in and ./linux/Documentation/Configure.help. In 2.6.x,
you need to modify ./linux/fs/Makefile and ./linux/fs/Kconfig.

MfG, JBG

-- 
   Jan-Benedict Glaw       jbglaw@lug-owl.de    . +49-172-7608481
   "Eine Freie Meinung in  einem Freien Kopf    | Gegen Zensur | Gegen Krieg
    fuer einen Freien Staat voll Freier Bürger" | im Internet! |   im Irak!
   ret = do_actions((curr | FREE_SPEECH) & ~(NEW_COPYRIGHT_LAW | DRM | TCPA));

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