all 5.5 bcachefs shills are really silent right now should have keep your ass on XFS lmao

Linux 6.18 Will Further Complicate Non-GPL Out-Of-Tree
File-Systems
Written Michael Larabel in Linux Storage on 11 September 2025 at 12:53 EDT. 24
Comments
Out-of-tree file-system drivers not licensed/compatible with the GPL will have
а new obstacle to deal with come time for Linux 6.18 later this year.
A patch queued up this week in advance of the Linux 6.18 merge window
opening removes write_cache_pages. In turn this will cause issues for поп-
GPL out-of-tree file-systems for writing dirty data from the page cache. After
the NTFS3 and Bcachefs in-tree users of the iterator were moved off of it, for Linux 6.18 the
"write_cache_pages" will be removed that is depended upon out-of-tree, non-GPL file-
systems.
This patch from Christoph Hellwig is what's now in linux-next ahead of Linux 6.18 and kills
off the write_cache_pages now that there are no longer any in-tree users.
The out-of-tree OpenZFS file-system is among the users of write_cache_pages.
The Phoronix reader who pointed me to this pending conflict with out-of-tree file-system
drivers commented in a message:
“With the removal of both file_operation.writepage and
write_cache_pages() it is no longer possible for out-of-tree non-GPL
filesystems to write dirty pages out of the page cache.
It might be possible to use non-RCU interfaces to walk the internal xarray
to search for dirty pages to write but that would be a major layer violation.
Not to mention performance would be severely impacted."
We'll see how the situation plays out in the coming weeks/months with the stable Linux 6.18
kernel due out in December.