[RFC 0/4] convert create_page_buffers to create_folio_buffers

[Pankaj Raghav]

One of the first kernel panic we hit when we try to increase the
block size > 4k is inside create_page_buffers()[1]. Even though buffer.c
function do not support large folios (folios > PAGE_SIZE) at the moment,
these changes are required when we want to remove that constraint.

Willy had already mentioned that he wanted to convert create_page_buffers to
create_folio_buffers but didn't get to it yet, so I decided to take a
shot.

No functional changes introduced.

OI:
- I don't like the fact that I had to introduce
  folio_create_empty_buffers() as create_empty_buffers() is used in
  many parts of the kernel. Should I do a big bang change as a part of
  this series where we convert create_empty_buffers to take a folio and
  change the callers to pass a folio instead of a page?

- I split the series into 4 commits for clarity. I could squash them
  into one patch if needed.

[1] https://lore.kernel.org/all/ZBnGc4WbBOlnRUgd@xxxxxxxxxxxxxxxxxxxx/

Pankaj Raghav (4):
  fs/buffer: add set_bh_folio helper
  buffer: add alloc_folio_buffers() helper
  fs/buffer: add folio_create_empty_buffers helper
  fs/buffer: convert create_page_buffers to create_folio_buffers

 fs/buffer.c                 | 131 +++++++++++++++++++++++++++++++++---
 include/linux/buffer_head.h |   4 ++
 2 files changed, 125 insertions(+), 10 deletions(-)

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2.34.1