Btrfs progs pre-release 4.8.1-rc2

Hi,

another pre-release. The problem with ioctl on 32bit ARM that Justin reported shows we have to be more careful with the changes to ioctl structures. The build size checks are now optional (make D=bcheck to enable) and the patches to add packing, alignment or alternate structures are left out.

ETA for 4.8.1 is tomorrow.

Changes since 4.8:
- 32bit build works
- build without backtrace support fixed

Tarballs: https://www.kernel.org/pub/linux/kernel/people/kdave/btrfs-progs/
Git: git://git.kernel.org/pub/scm/linux/kernel/git/kdave/btrfs-progs.git

Shortlog:

David Sterba (6):
btrfs-progs: build: add explicit option separator to rm commands
btrfs-progs: tests: add script to help build coverage
btrfs-progs: fix printf format of sizeof on 32bit build
btrfs-progs: ioctl: make build-time structure size checks optional
btrfs-progs: update CHANGES for v4.8.1
Btrfs progs v4.8.1-rc2

Qu Wenruo (1):
btrfs-progs: Fix warning_trace compile error if backtrace is disabled