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| author |   Matthew Wilcox (Oracle) <willy@infradead.org> | 2022-12-15 21:43:51 +0000 |
|---|---|---|
| committer |   Andrew Morton <akpm@linux-foundation.org> | 2023-01-18 17:12:39 -0800 |
| commit | d685c668b0695dff927c85e27ef27d4f404f16a3 (patch) | |
| tree | 12dc6df7ee71fc26e275deb48df0a44979db8965 /include/linux/buffer_head.h | |
| parent | mm/hugetlb: introduce hugetlb_walk() (diff) | |
| download | wireguard-linux-d685c668b0695dff927c85e27ef27d4f404f16a3.tar.xz wireguard-linux-d685c668b0695dff927c85e27ef27d4f404f16a3.zip | |
buffer: add b_folio as an alias of b_page
Patch series "Start converting buffer_heads to use folios".
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 patch (of 12):
Buffer heads point to the allocation (ie the folio), not the page. This
is currently the same thing for all filesystems that use buffer heads, so
this is a safe transitional step.
Link: https://lkml.kernel.org/r/20221215214402.3522366-1-willy@infradead.org
Link: https://lkml.kernel.org/r/20221215214402.3522366-2-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/linux/buffer_head.h')
| -rw-r--r-- | include/linux/buffer_head.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h index 33fa5e94aa80..8f14dca5fed7 100644 --- a/include/linux/buffer_head.h +++ b/include/linux/buffer_head.h @@ -61,7 +61,10 @@ typedef void (bh_end_io_t)(struct buffer_head *bh, int uptodate); struct buffer_head { unsigned long b_state; /* buffer state bitmap (see above) */ struct buffer_head *b_this_page;/* circular list of page's buffers */ - struct page *b_page; /* the page this bh is mapped to */ + union { + struct page *b_page; /* the page this bh is mapped to */ + struct folio *b_folio; /* the folio this bh is mapped to */ + }; sector_t b_blocknr; /* start block number */ size_t b_size; /* size of mapping */ |