ext2's inode i_version gone, what now? (stable branch)

ext2's inode i_version gone, what now? (stable branch)

[Andreas Schuldei]

I try to use the Steganographic filesystem stegfs on top of a 2.2.18 kernel,
while the stegfs patch was against 2.2.14. The patch applied allmost clean,
but that was easy to fix. 

However a real problem (for me) is that the author (whom I can not reach by
email) build stegfs on top of the ext2 filesystem. There he uses ext2's inode
structure and at some places reads/writes from ext2 inode's i_version.
However, this is not there in ext2_fs_i.h. But I am working with source for
2.2.18 and a lot could have happend since 2.2.14. I would not have expected
the inode struct to change, though.

Why was it taken away? How is compatibility maintained? What could I use 
instead to fix the problem?

Anyone who is interested in this:
http://ban.joh.cam.ac.uk/~adm36/StegFS/download.html

the error happens at 
make[3]: Entering directory `/usr/src/linux/fs/stegfs'
cc -D__KERNEL__ -I/usr/src/linux/include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -fno-strict-aliasing -pipe -fno-strength-reduce -m486 -malign-loops=2 -malign-jumps=2 -malign-functions=2 -DCPU=686   -c -o inode.o inode.c
inode.c: In function `stegfs_read_inode':
inode.c:1376: structure has no member named `i_version'
inode.c: In function `stegfs_update_inode':
inode.c:1785: structure has no member named `i_version'

please cc me, I am not on this list.

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Re: ext2's inode i_version gone, what now? (stable branch)

[Andreas Schuldei]

* Andreas Schuldei (andreas@schuldei.org) [001229 22:08]:
> However a real problem (for me) is that the author (whom I can not reach by
> email) build stegfs on top of the ext2 filesystem. There he uses ext2's inode
> structure and at some places reads/writes from ext2 inode's i_version.
> However, this is not there in ext2_fs_i.h. But I am working with source for
> 2.2.18 and a lot could have happend since 2.2.14. I would not have expected
> the inode struct to change, though.
> 
> Why was it taken away? How is compatibility maintained? What could I use 
> instead to fix the problem?

Now I think i_version was moved from ext2_fs_i.h (struct ext2_inode_info) to
fs.h (struct inode). stegfs still has i_version in it's own stegfs_inode_info.
I guess to cleanly move the stegfs from 2.2.14 to 2.2.18 it would be good to
not have a own stegfs i_version. Are there any mean, hidden, desasterous
implications waiting if I move it?

> Anyone who is interested in this:
> http://ban.joh.cam.ac.uk/~adm36/StegFS/download.html

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Re: ext2's inode i_version gone, what now? (stable branch)

[Stephen C. Tweedie]

Hi,

On Sat, Dec 30, 2000 at 12:54:17PM +0100, Andreas Schuldei wrote:
> > 
> > Why was it taken away? How is compatibility maintained? What could I use 
> > instead to fix the problem?
> 
> Now I think i_version was moved from ext2_fs_i.h (struct ext2_inode_info) to
> fs.h (struct inode). stegfs still has i_version in it's own stegfs_inode_info.
> I guess to cleanly move the stegfs from 2.2.14 to 2.2.18 it would be good to
> not have a own stegfs i_version. Are there any mean, hidden, desasterous
> implications waiting if I move it?

It changed from i_version to i_generation, and NFS serving will break
in subtle ways if you reuse it.

Cheers,
 Stephen
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