[PATCH 0/3] btrfs-progs: tune: bgt resume related fix and enhancement

[Qu Wenruo <wqu@suse.com>]

There is a bug report from the mailing list (1) that btrfstune failed to
resume an interrupted conversion.

Although I hacked a small patch to skip the part of code that I believe
is the cause, it doesn't properly explain why the bug happened, as the
code looks good to me.

But with some time to tinker, I finally created a half-converted image
and can reproduce the bug somewhat reliably.

It turns out to be an uninitialized structure, and this also exposed an
inefficient behavior when reading block groups from the old extent tree.

Fix the bug first with the first patch.
Then enhance the extent tree block group items loading from the old
tree.

Finally a new test image for the bug.

(1): https://lore.kernel.org/linux-btrfs/a90b9418-48e8-47bf-8ec0-dd377a7c1f4e@gmail.com/

Qu Wenruo (3):
  btrfs-progs: tune: fix uninitialized value which leads to failed
    resume
  btrfs-progs: optimize the block group item load for half converted fs
  btrfs-progs: misc-tests: add an image for btrfstune bgt conversion

 kernel-shared/extent-tree.c                   |  47 ++++--------------
 tests/common                                  |   8 +++
 .../half-converted-bgt.raw.zst                | Bin 0 -> 2760068 bytes
 .../069-btrfstune-resume-bgt/test.sh          |  15 ++++++
 4 files changed, 33 insertions(+), 37 deletions(-)
 create mode 100644 tests/misc-tests/069-btrfstune-resume-bgt/half-converted-bgt.raw.zst
 create mode 100755 tests/misc-tests/069-btrfstune-resume-bgt/test.sh

--
2.49.0