[PATCH 0/3] Btrfs: fix free space tree bitmaps+tests on big-endian systems

[Omar Sandoval <osandov@osandov.com>]

From: Omar Sandoval <osandov@fb.com>

So it turns out that the free space tree bitmap handling has always been
broken on big-endian systems. Totally my bad.

Patch 1 fixes this. Technically, it's a disk format change for
big-endian systems, but it never could have worked before, so I won't go
through the trouble of any incompat bits. If you've somehow been using
space_cache=v2 on a big-endian system (I doubt anyone is), you're going
to want to mount with nospace_cache to clear it and wait for this to go
in.

Patch 2 fixes a similar error in the sanity tests (it's the same as the
v2 I posted here [1]) and patch 3 expands the sanity tests to catch the
oversight that patch 1 fixes.

Applies to v4.7-rc7. No regressions in xfstests, and the sanity tests
pass on x86_64 and MIPS.

Thanks!

1: http://thread.gmane.org/gmane.comp.file-systems.btrfs/58329

Omar Sandoval (3):
  Btrfs: fix free space tree bitmaps on big-endian systems
  Btrfs: fix extent buffer bitmap tests on big-endian systems
  Btrfs: expand free space tree sanity tests to catch endianness bug

 fs/btrfs/extent_io.c                   |  64 +++++++++----
 fs/btrfs/extent_io.h                   |  22 +++++
 fs/btrfs/free-space-tree.c             |  17 ++--
 fs/btrfs/tests/extent-io-tests.c       |  87 +++++++++--------
 fs/btrfs/tests/free-space-tree-tests.c | 164 +++++++++++++++++++--------------
 5 files changed, 223 insertions(+), 131 deletions(-)

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2.9.0