Btrfs devel - May 2010 - dkms build error

Hi,

Unfortunately, I did not succeed to compile a btrfs module via dkms from
btrfs-unstable (commit 9aeead73782c4b8e2a91def36dbf95db28605c95) for kernel
version 2.6.34-git16. For the exact error message, please see the make.log
attached. If I replace the symlink to btrfs-unstable/fs/btrfs by a sumlink
to the corresponding subdirectory of the kernel tree everything works well.

Thanks,
Andreas Philipp

aph@thor ~ $ cat /var/lib/dkms/btrfs/git/build/make.log
DKMS make.log for btrfs-git for kernel 2.6.34-git16 (x86_64)
Sun May 30 20:37:43 CEST 2010
make: Entering directory `/usr/src/linux-2.6.34-git16''
  LD      /var/lib/dkms/btrfs/git/build/built-in.o
  CC [M]  /var/lib/dkms/btrfs/git/build/super.o
/var/lib/dkms/btrfs/git/build/super.c: In function ‘btrfs_fill_super’:
/var/lib/dkms/btrfs/git/build/super.c:446: warning: assignment from incompatible
pointer type
  CC [M]  /var/lib/dkms/btrfs/git/build/ctree.o
  CC [M]  /var/lib/dkms/btrfs/git/build/extent-tree.o
/var/lib/dkms/btrfs/git/build/extent-tree.c: In function ‘btrfs_issue_discard’:
/var/lib/dkms/btrfs/git/build/extent-tree.c:1699: error: ‘DISCARD_FL_BARRIER’
undeclared (first use in this function)
/var/lib/dkms/btrfs/git/build/extent-tree.c:1699: error: (Each undeclared
identifier is reported only once
/var/lib/dkms/btrfs/git/build/extent-tree.c:1699: error: for each function it
appears in.)
make[1]: *** [/var/lib/dkms/btrfs/git/build/extent-tree.o] Error 1
make: *** [_module_/var/lib/dkms/btrfs/git/build] Error 2
make: Leaving directory `/usr/src/linux-2.6.34-git16''


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On Mon, 31 May 2010 09:20:22 +0200 Andreas Philipp wrote:
> I did not succeed to compile a btrfs module via dkms from btrfs-unstable...
> For the exact error message, please see the make.log...
> /var/lib/dkms/btrfs/git/build/extent-tree.c:1699: error: 
>   ‘DISCARD_FL_BARRIER’ undeclared (first use in this function)
The problem is the blkdev flag name change that occurred in this commit from
Linus'' tree around 2.6.35:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=fbd9b09a177a481eda256447c881f014f29034fe

which is not in btrfs-unstable.  That patch doesn''t apply cleanly to
the
btrfs-unstable tree so attached is one that just modifies extent-tree.c.

Jim