Btrfs devel - Feb 2011 - Building btrfs as a dkms module on Debian

Hi everyone. I was trying to test a more recent version of btrfs on my current
kernel (2.6.37) using dkms, without success.

I followed these instructions:

https://btrfs.wiki.kernel.org/index.php/Btrfs_source_repositories

- cloned the repo
- symlinked to /usr/src/btrfs-git
- patched version.sh:

Please note version.sh requires bash (better to change the shebang or fix the
script).
Even with the patch, version.sh run on a shallow repository generates a
"-dirty" version. I assume this is OK, even though there are no local
changes.

- run version.sh
- dkms add -m btrfs -v git
- dkms build -m btrfs -v git fails with:

/var/lib/dkms/btrfs/git/build/extent-tree.c: In function ‘btrfs_issue_discard’:
/var/lib/dkms/btrfs/git/build/extent-tree.c:1747: error: ‘BLKDEV_IFL_WAIT’
undeclared (first use in this function)
/var/lib/dkms/btrfs/git/build/extent-tree.c:1747: error: (Each undeclared
identifier is reported only once
/var/lib/dkms/btrfs/git/build/extent-tree.c:1747: error: for each function it
appears in.)
/var/lib/dkms/btrfs/git/build/extent-tree.c:1747: error: ‘BLKDEV_IFL_BARRIER’
undeclared (first use in this function)

I assume BLKDEV_IFL_WAIT/BARRIER was added in later kernels?
Is there a way to make it build btrfs for 2.6.37?

Thanks

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On 02/15/2011 11:35 PM, Yuri D''Elia wrote:
> Hi everyone. I was trying to test a more recent version of btrfs on my
current kernel (2.6.37) using dkms, without success.
> 
> I followed these instructions:
> 
> https://btrfs.wiki.kernel.org/index.php/Btrfs_source_repositories
> 
> - cloned the repo
> - symlinked to /usr/src/btrfs-git
> - patched version.sh:
> 
> Please note version.sh requires bash (better to change the shebang or fix
the script).
> Even with the patch, version.sh run on a shallow repository generates a
"-dirty" version. I assume this is OK, even though there are no local
changes.
> 
> - run version.sh
> - dkms add -m btrfs -v git
> - dkms build -m btrfs -v git fails with:
> 
> /var/lib/dkms/btrfs/git/build/extent-tree.c: In function
‘btrfs_issue_discard’:
> /var/lib/dkms/btrfs/git/build/extent-tree.c:1747: error: ‘BLKDEV_IFL_WAIT’
undeclared (first use in this function)
> /var/lib/dkms/btrfs/git/build/extent-tree.c:1747: error: (Each undeclared
identifier is reported only once
> /var/lib/dkms/btrfs/git/build/extent-tree.c:1747: error: for each function
it appears in.)
> /var/lib/dkms/btrfs/git/build/extent-tree.c:1747: error:
‘BLKDEV_IFL_BARRIER’ undeclared (first use in this function)
> 
> I assume BLKDEV_IFL_WAIT/BARRIER was added in later kernels?
> Is there a way to make it build btrfs for 2.6.37?
in commit fbd9b09a177a481eda256447c881f014f29034fe:
include/linux/blkdev.h:

#define BLKDEV_IFL_WAIT         (1 << BLKDEV_WAIT)
#define BLKDEV_IFL_BARRIER      (1 << BLKDEV_BARRIER)
#define BLKDEV_IFL_SECURE       (1 << BLKDEV_SECURE)

Maybe this is helpful.:)

thanks,
liubo
> 
> Thanks
> 
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On Wed, 16 Feb 2011 10:51:43 +0800
liubo <liubo2009@cn.fujitsu.com> wrote:
> > I assume BLKDEV_IFL_WAIT/BARRIER was added in later kernels?
> > Is there a way to make it build btrfs for 2.6.37?
> 
> in commit fbd9b09a177a481eda256447c881f014f29034fe:
> include/linux/blkdev.h:
> 
> #define BLKDEV_IFL_WAIT         (1 << BLKDEV_WAIT)
> #define BLKDEV_IFL_BARRIER      (1 << BLKDEV_BARRIER)
> #define BLKDEV_IFL_SECURE       (1 << BLKDEV_SECURE)
> 
> Maybe this is helpful.:)
I''ve worked more on this today. There was a lot of restructuring of
blkdev in 2.6.38, but in stock 2.6.37 only BLKDEV_SECURE has any effect.

Just in case, I''m posting here the changes required to backport current
btrfs to 2.6.37 (just a few minor changes).