[PATCH 0/6] btrfs: compression: migrate to folio interfaces

[Qu Wenruo <wqu@suse.com>]

This is the conversion for btrfs compression paths to use folio
interfaces.

For now, it's a pure intrefaces change, just with some variable names
also changed from "page" to "folio".

There is no utilization of possible larger folio size yet, thus we're
still using a lot of PAGE_SIZE/PAGE_SHIFT in the existing code.

But it's still a good first step towards large folio for btrfs data.

The first patch is in fact independent from the series, to slightly
enhance the page cache missing error handling, but all later patches
relies on it, to make later folio change a little smoother.

The third patch is also a good cleanup, as it allows we to pass a single
page to inline creation path.
Although during tests, it turns out that under heavy race we can try to
insert an empty inline extent, but since the old code can handle it
well, I just added one comment for it.

The remaining but the last one are some preparation before the final
conversion.

And the final patch is the core conversion, as we have several structure
relying on page array, it's impossible to just convert one algorithm to
folio meanwhile keep all the other using pages.


Qu Wenruo (6):
  btrfs: compression: add error handling for missed page cache
  btrfs: compression: convert page allocation to folio interfaces
  btrfs: make insert_inline_extent() to accept one page directly
  btrfs: migrate insert_inline_extent() to folio interfaces
  btrfs: introduce btrfs_alloc_folio_array()
  btrfs: compression: migrate compression/decompression paths to folios

 fs/btrfs/compression.c | 119 +++++++++++++++++++-------------
 fs/btrfs/compression.h |  41 ++++++------
 fs/btrfs/extent_io.c   |  31 +++++++++
 fs/btrfs/extent_io.h   |   2 +
 fs/btrfs/inode.c       | 149 +++++++++++++++++++++--------------------
 fs/btrfs/lzo.c         |  87 ++++++++++++------------
 fs/btrfs/zlib.c        | 110 ++++++++++++++++--------------
 fs/btrfs/zstd.c        |  79 ++++++++++++----------
 8 files changed, 349 insertions(+), 269 deletions(-)

-- 
2.43.0