[00/12] Start converting buffer_heads to use folios

Message

Matthew Wilcox Dec. 15, 2022, 9:43 p.m. UTC

I was hoping that filesystems would convert from buffer_heads to iomap,
but that's not happening particularly quickly.  So the buffer_head
infrastructure needs to be converted from being page-based to being
folio-based.  This is the initial patchset that I hope Andrew will take
for 6.3.  I have a lot of followup patches, but many of them should go
through individual filesystem trees (ext4, f2fs, etc).  They can wait
for 6.4.

Matthew Wilcox (Oracle) (12):
  buffer: Add b_folio as an alias of b_page
  buffer: Replace obvious uses of b_page with b_folio
  buffer: Use b_folio in touch_buffer()
  buffer: Use b_folio in end_buffer_async_read()
  buffer: Use b_folio in end_buffer_async_write()
  page_io: Remove buffer_head include
  buffer: Use b_folio in mark_buffer_dirty()
  gfs2: Replace obvious uses of b_page with b_folio
  jbd2: Replace obvious uses of b_page with b_folio
  nilfs2: Replace obvious uses of b_page with b_folio
  reiserfs: Replace obvious uses of b_page with b_folio
  mpage: Use b_folio in do_mpage_readpage()

 fs/buffer.c                   | 54 +++++++++++++++++------------------
 fs/gfs2/glops.c               |  2 +-
 fs/gfs2/log.c                 |  2 +-
 fs/gfs2/meta_io.c             |  2 +-
 fs/jbd2/commit.c              |  8 ++----
 fs/jbd2/journal.c             |  2 +-
 fs/mpage.c                    |  2 +-
 fs/nilfs2/btnode.c            |  2 +-
 fs/nilfs2/btree.c             |  2 +-
 fs/nilfs2/gcinode.c           |  2 +-
 fs/nilfs2/mdt.c               |  4 +--
 fs/nilfs2/segment.c           |  2 +-
 fs/reiserfs/journal.c         |  4 +--
 fs/reiserfs/tail_conversion.c |  2 +-
 include/linux/buffer_head.h   |  5 +++-
 mm/page_io.c                  |  1 -
 16 files changed, 47 insertions(+), 49 deletions(-)

Comments

Jan Kara Jan. 12, 2023, 12:01 p.m. UTC | #1

On Thu 15-12-22 21:43:50, Matthew Wilcox (Oracle) wrote:
> I was hoping that filesystems would convert from buffer_heads to iomap,
> but that's not happening particularly quickly.  So the buffer_head
> infrastructure needs to be converted from being page-based to being
> folio-based.  This is the initial patchset that I hope Andrew will take
> for 6.3.  I have a lot of followup patches, but many of them should go
> through individual filesystem trees (ext4, f2fs, etc).  They can wait
> for 6.4.

FWIW I went through all the patches and they look fine to me so feel free
to add:

Reviewed-by: Jan Kara <[e-mail]>

								Honza

> 
> Matthew Wilcox (Oracle) (12):
>   buffer: Add b_folio as an alias of b_page
>   buffer: Replace obvious uses of b_page with b_folio
>   buffer: Use b_folio in touch_buffer()
>   buffer: Use b_folio in end_buffer_async_read()
>   buffer: Use b_folio in end_buffer_async_write()
>   page_io: Remove buffer_head include
>   buffer: Use b_folio in mark_buffer_dirty()
>   gfs2: Replace obvious uses of b_page with b_folio
>   jbd2: Replace obvious uses of b_page with b_folio
>   nilfs2: Replace obvious uses of b_page with b_folio
>   reiserfs: Replace obvious uses of b_page with b_folio
>   mpage: Use b_folio in do_mpage_readpage()
> 
>  fs/buffer.c                   | 54 +++++++++++++++++------------------
>  fs/gfs2/glops.c               |  2 +-
>  fs/gfs2/log.c                 |  2 +-
>  fs/gfs2/meta_io.c             |  2 +-
>  fs/jbd2/commit.c              |  8 ++----
>  fs/jbd2/journal.c             |  2 +-
>  fs/mpage.c                    |  2 +-
>  fs/nilfs2/btnode.c            |  2 +-
>  fs/nilfs2/btree.c             |  2 +-
>  fs/nilfs2/gcinode.c           |  2 +-
>  fs/nilfs2/mdt.c               |  4 +--
>  fs/nilfs2/segment.c           |  2 +-
>  fs/reiserfs/journal.c         |  4 +--
>  fs/reiserfs/tail_conversion.c |  2 +-
>  include/linux/buffer_head.h   |  5 +++-
>  mm/page_io.c                  |  1 -
>  16 files changed, 47 insertions(+), 49 deletions(-)
> 
> -- 
> 2.35.1
>