I need to cast struct inode to struct btrfs_inode.
in order to do it, i looked at implementation of btrfs_getattr.

the code is simple:
struct btrfs_inode *btrfsInode;
btrfsInode = BTRFS_I(inode);

in order to compile i must add the headers on top of the function:
#include "/data/kernel/linux-4.1.21-x86_64/fs/btrfs/ctree.h"
#include "/data/kernel/linux-4.1.21-x86_64/fs/btrfs/btrfs_inode.h"

What is the problem ?
I must manually download and include ctree.h and btrfs_inode.h, they
are not provided in the kernel-headers package.
On every platform I compile my driver, I have specific VM for the
distro/kernel version, so on every VM I usually download package
kernel-headers and everything compiles perfectly.

btrfs was introduced in kernel 3.0 above.
Arent the btrfs headers should be there ? do they exist in another
package ? maybe fs-headers or something like that ?
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