[PATCH 0/6] Cleanup super block stripe exclusion code

[Nikolay Borisov <nborisov@suse.com>]

This series aims to cleanup the code necessary to exclude io stripes within a
chunk that can contain a superblock. To achieve this following actions are taken
(in order of appearance) :

1. Make btrfs_rmap_block private to block-group.c since it's only used by
exclude_super_stripes.

2. Extend btrfs selftest framework to accommodate testing of btrfs_rmap_block's
functionality

3. Add tests for btrfs_rmap_block

4. With tests in place perform surgery on btrfs_rmap_block to make it more readable,
this is achieved by renamring variables, making code more linear, getting rid
of a BUG_ON.

5. After btrfs_rmap_block is sane it's easier to reason about some of its
invariants, allowing me to simplify exclude_super_stripes.

This series survived full xfstest with no visible regressions.

Nikolay Borisov (6):
  btrfs: Move and unexport btrfs_rmap_block
  btrfs: selftests: Add support for dummy devices
  btrfs: Add self-tests for btrfs_rmap_block
  btrfs: Refactor btrfs_rmap_block to improve readability
  btrfs: Read stripe len directly in btrfs_rmap_block
  btrfs: Remove dead code exclude_super_stripes

 fs/btrfs/block-group.c            | 107 +++++++++++++++++++++----
 fs/btrfs/tests/btrfs-tests.c      |  28 +++++++
 fs/btrfs/tests/btrfs-tests.h      |   1 +
 fs/btrfs/tests/extent-map-tests.c | 128 +++++++++++++++++++++++++++++-
 fs/btrfs/volumes.c                |  69 ----------------
 fs/btrfs/volumes.h                |   2 -
 6 files changed, 246 insertions(+), 89 deletions(-)

--
2.17.1