Btrfs fixes fro 6.19-rc8

Hi,

please pull two fixes for bugs with serious consequences. Thanks.

- fix leaked folio refcount on s390x when using hw zlib compression acceleration

- remove own threshold from ->writepages() which could collide with cgroup limits and lead to a deadlock when metadadata are not written because the amount is under the internal limit

----------------------------------------------------------------
The following changes since commit 34308187395ff01f2d54007eb8b222f843bdf445:

btrfs: add extra device item checks at mount (2026-01-20 17:18:48 +0100)

are available in the Git repository at:

git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux.git tags/for-6.19-rc7-tag

for you to fetch changes up to 0d0f1314e8f86f5205f71f9e31e272a1d008e40b:

btrfs: zlib: fix the folio leak on S390 hardware acceleration (2026-01-21 19:35:41 +0100)

----------------------------------------------------------------
Qu Wenruo (2):
btrfs: do not strictly require dirty metadata threshold for metadata writepages
btrfs: zlib: fix the folio leak on S390 hardware acceleration

 fs/btrfs/disk-io.c   | 22 ----------------------
 fs/btrfs/extent_io.c |  3 +--
 fs/btrfs/extent_io.h |  3 +--
 fs/btrfs/zlib.c      |  1 +
 4 files changed, 3 insertions(+), 26 deletions(-)