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Previously the project contained who zfs_context.h files, one for user space builds and one for kernel space builds. It was the responsibility of the source including the file to ensure the right one was included based on the order of the include paths. This was the way it was done in OpenSolaris but for our purposes I felt it was overly obscure. The user and kernel zfs_context.h files have been combined in to a single file and a #define determines if you get the user or kernel context. The issue here was that I used the _KERNEL macro which is defined as part of the spl which will only be defined for most builds after you include the right zfs_context. It is safer to use the __KERNEL__ macro which is automatically defined as part of the kernel build process and passed as a command line compiler option. It will always be defined if your building in the kernel and never for user space.
Native ZFS for Linux! ZFS is an advanced file system and volume manager which was originally developed for Solaris. It has been successfully ported to FreeBSD and now there is a functional Linux ZFS kernel port too. The port currently includes a fully functional and stable SPA, DMU, and ZVOL with a ZFS Posix Layer (ZPL) on the way!
To build packages for your distribution, first build and install the SPL packages http://wiki.github.com/behlendorf/spl/ then:
$ ./configure $ make pkg
Full documentation for building, configuring, and using ZFS can be found at: http://wiki.github.com/behlendorf/zfs/