[PATCH v2 0/5] btrfs: btrfs_get_extent() cleanup for inline extents

[Qu Wenruo <wqu@suse.com>]

Currently we have some very confusing (and harder to explain) code
inside btrfs_get_extent() for inline extents.

The TL;DR is, those mess is to support inline extents at non-zero file
offset.

This is completely impossible now, as tree-checker will reject any
inline file extents at non-zero offset.

So this series will:

- Update the selftest to get rid of the impossible case

- Simplify the inline extent read

  Since we no longer need to support inline extents at non-zero file
  offset, some variables can be removed.

- Don't reset the inline extent map members

  Those resets are either doing nothing (setting the member to the same
  value), or making no difference (the member is not utilized anyway)

- Remove @new_inline argument for btrfs_extent_item_to_extent_map()

  That argument makes btrfs_get_extent() to skip certain member update.
  Previously it makes a difference only for fiemap.

  But now since fiemap no longer relies on extent_map, the remaining
  use cases won't bother those members anyway.

  Thus we can remove the bool argument and make
  btrfs_extent_item_to_extent_map() to have a consistent behavior.

- Introduce a helper to do inline extents read

  Now the function is so simple that, extracting the helper can only
  reduce indents.

[CHANGELOG]
v2:
- Do better patch split for bisection with better reason

- Put the selftest to the first to help bisection
  Or we may hit ASSERT() during selftest.

Qu Wenruo (5):
  btrfs: selftests: remove impossible inline extent at non-zero file
    offset
  btrfs: make inline extent read calculation much simpler
  btrfs: do not reset extent map members for inline extents read
  btrfs: remove the @new_inline argument from
    btrfs_extent_item_to_extent_map()
  btrfs: extract the inline extent read code into its own function

 fs/btrfs/ctree.h             |   1 -
 fs/btrfs/extent_map.c        |   7 +++
 fs/btrfs/file-item.c         |   6 +--
 fs/btrfs/inode.c             | 100 +++++++++++++++++++----------------
 fs/btrfs/ioctl.c             |   2 +-
 fs/btrfs/tests/inode-tests.c |  56 +++++++-------------
 6 files changed, 83 insertions(+), 89 deletions(-)

-- 
2.37.3