[PATCH v2 0/3] btrfs: find_free_extent cleanups

[Leo Martins <loemra.dev@gmail.com>]

The first patch removes redundant RAID loop logic that became obsolete
after previous changes ensured allocations only occur from block groups
with matching RAID level.

The second patch adds comprehensive tracing to find_free_extent() to
improve debugging and performance analysis capabilities.

Here is a bpftrace script I put together to analyze the allocation
behavior, along with output.
Link: https://github.com/loemraw/btrfs-scripts/blob/main/ffe_analyzer.bt
Link: https://github.com/loemraw/btrfs-scripts/blob/main/ffe_analyzer.out

Testing:
- ran xfstests btrfs/auto
- verified trace events output correctly
- new fstest that tests RAID conversions under stress

Change log:
v1 -> v2:
PATCH 1
- re-add full_search
PATCH 2
- standardize naming of skip reasons
- remove preapare_allocation_failure reason as it's not a skip
- add more error_or_values for skip reasons
PATCH 3
- new fstests for raid conversions under stress


Leo Martins (2):
  btrfs: remove ffe RAID loop
  btrfs: add tracing for find_free_extent skip conditions

 fs/btrfs/extent-tree.c       | 70 ++++++++++++++++++------------------
 fs/btrfs/extent-tree.h       | 17 +++++++++
 include/trace/events/btrfs.h | 66 ++++++++++++++++++++++++++++++++++
 3 files changed, 119 insertions(+), 34 deletions(-)

-- 
2.47.3