Thank you, however I can't seem to be able to compile that snapshot, I'm getting

===========================
/usr/bin/install -c -m644 -d 64-btrfs-dm.rules
/home/myuser/aur/btrfs-progs-git/pkg/btrfs-progs-git/usr/lib/udev/rules.d
/usr/bin/install: cannot create directory ‘64-btrfs-dm.rules’: File exists
Makefile:400: recipe for target 'install' failed
make: *** [install] Error 1
==> ERROR: A failure occurred in package()
===========================

Just to make sure I wasn't screwing up somewhere, I tried the
btrfs-progs-git AUR package and I'm getting the same thing.
It's not only me, however: according to [1] it could be that this
commit has introduced it: [2]

Regards,
Ivan.

[1] https://aur.archlinux.org/packages/btrfs-progs-git/
[2] 
http://repo.or.cz/btrfs-progs-unstable/devel.git?a=commit;h=ebe5b1cc7885027521db3c1d16d84bd54cc1321b

On Tue, May 17, 2016 at 5:56 AM, Qu Wenruo <quwen...@cn.fujitsu.com> wrote:
> Also to Ivan P, the initial reporter of the problem.
>
> Now "btrfsck --clear-cache" should help you to prevent kernel warning on
> free space cache problem.
>
> Thanks,
> Qu
>
> Qu Wenruo wrote on 2016/05/17 11:47 +0800:
>>
>> The patchset can be also fetched from github, just in case mail list
>> blocks the last patch, which contains binary file.
>> https://github.com/adam900710/btrfs-progs.git fsck_clear_cache
>>
>> Just as describe in the first patch, btrfs kernel "clear_cache" mount
>> option can't rebuild all free space cache, due to the design of free
>> space cache.
>> (Although I pretty like the idea to delay the load of free space cache,
>> as it hugely reduce the mount time of large fs)
>>
>> So this makes users to report error in mail list, complaining
>> "clear_cache" doesn't wipe the annoying kernel warning on corrupted free
>> space cache.
>>
>> Since kernel can't handle it, and user consider it more like an error,
>> we'd better handle it like an error, to fix it in btrfs check.
>>
>> So this patchset adds the ability to clear free space cache, and add
>> test case for it.
>>
>> The clear procedure is different from kernel, it will remove all free
>> space cache inodes and its contents(with backrefs), and set
>> cache_generation of super block to -1.
>> So there will be no free space cache at all and kernel will be happy
>> with that.
>>
>> This patch also enhances btrfs_previous_item() to use min_objectid to
>> return as early as possible.
>>
>> Lu Fengqi (1):
>>   btrfs-progs: tests: add 020-bad-free-space-cache
>>
>> Qu Wenruo (3):
>>   btrfs-progs: corrupt-block: Add ability to corrupt free space cache
>>     file
>>   btrfs-progs: ctree: return earlier for btrfs_previous_item
>>   btrfs-progs: fsck: Add support to clear free space cache
>>
>>  Documentation/btrfs-check.asciidoc                 |   8 ++
>>  btrfs-corrupt-block.c                              | 124
>> ++++++++++++++++++++-
>>  cmds-check.c                                       |  58 +++++++++-
>>  ctree.c                                            |   2 +
>>  free-space-cache.c                                 | 124
>> +++++++++++++++++++++
>>  free-space-cache.h                                 |   4 +
>>  .../020-bad-free-space-cache/default_case.raw.xz   | Bin 0 -> 164068
>> bytes
>>  tests/fsck-tests/020-bad-free-space-cache/test.sh  |  16 +++
>>  8 files changed, 334 insertions(+), 2 deletions(-)
>>  create mode 100644
>> tests/fsck-tests/020-bad-free-space-cache/default_case.raw.xz
>>  create mode 100755 tests/fsck-tests/020-bad-free-space-cache/test.sh
>>
>
>
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