A struct folio is a new abstraction for a head-or-single page. A function
which takes a struct folio argument declares that it will operate on the
entire (possibly compound) page, not just PAGE_SIZE bytes. In return,
the caller guarantees that the pointer it is passing does not point to
a tail page.
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
include/linux/mm.h | 78 ++++++++++++++++++++++++++++++++++++++++
include/linux/mm_types.h | 36 +++++++++++++++++++
2 files changed, 114 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index cb1e191da319..9b7e3fa12fd3 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -934,6 +934,20 @@ static inline unsigned int compound_order(struct page *page)
return page[1].compound_order;
}
+/**
+ * folio_order - The allocation order of a folio.
+ * @folio: The folio.
+ *
+ * A folio is composed of 2^order pages. See get_order() for the definition
+ * of order.
+ *
+ * Return: The order of the folio.
+ */
+static inline unsigned int folio_order(struct folio *folio)
+{
+ return compound_order(&folio->page);
+}
+
static inline bool hpage_pincount_available(struct page *page)
{
/*
@@ -1579,6 +1593,69 @@ static inline void set_page_links(struct page *page, enum zone_type zone,
#endif
}
+/**
+ * folio_nr_pages - The number of pages in the folio.
+ * @folio: The folio.
+ *
+ * Return: A number which is a power of two.
+ */
+static inline unsigned long folio_nr_pages(struct folio *folio)
+{
+ return compound_nr(&folio->page);
+}
+
+/**
+ * folio_next - Move to the next physical folio.
+ * @folio: The folio we're currently operating on.
+ *
+ * If you have physically contiguous memory which may span more than
+ * one folio (eg a &struct bio_vec), use this function to move from one
+ * folio to the next. Do not use it if the memory is only virtually
+ * contiguous as the folios are almost certainly not adjacent to each
+ * other. This is the folio equivalent to writing ``page++``.
+ *
+ * Context: We assume that the folios are refcounted and/or locked at a
+ * higher level and do not adjust the reference counts.
+ * Return: The next struct folio.
+ */
+static inline struct folio *folio_next(struct folio *folio)
+{
+#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
+ return (struct folio *)nth_page(&folio->page, folio_nr_pages(folio));
+#else
+ return folio + folio_nr_pages(folio);
+#endif
+}
+
+/**
+ * folio_shift - The number of bits covered by this folio.
+ * @folio: The folio.
+ *
+ * A folio contains a number of bytes which is a power-of-two in size.
+ * This function tells you which power-of-two the folio is.
+ *
+ * Context: The caller should have a reference on the folio to prevent
+ * it from being split. It is not necessary for the folio to be locked.
+ * Return: The base-2 logarithm of the size of this folio.
+ */
+static inline unsigned int folio_shift(struct folio *folio)
+{
+ return PAGE_SHIFT + folio_order(folio);
+}
+
+/**
+ * folio_size - The number of bytes in a folio.
+ * @folio: The folio.
+ *
+ * Context: The caller should have a reference on the folio to prevent
+ * it from being split. It is not necessary for the folio to be locked.
+ * Return: The number of bytes in this folio.
+ */
+static inline size_t folio_size(struct folio *folio)
+{
+ return PAGE_SIZE << folio_order(folio);
+}
+
/*
* Some inline functions in vmstat.h depend on page_zone()
*/
@@ -1683,6 +1760,7 @@ extern void pagefault_out_of_memory(void);
#define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
#define offset_in_thp(page, p) ((unsigned long)(p) & (thp_size(page) - 1))
+#define offset_in_folio(folio, p) ((unsigned long)(p) & (folio_size(folio) - 1))
/*
* Flags passed to show_mem() and show_free_areas() to suppress output in
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 6613b26a8894..4fc0b230d3ea 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -224,6 +224,42 @@ struct page {
#endif
} _struct_page_alignment;
+/**
+ * struct folio - Represents a contiguous set of bytes.
+ * @page: Either a base (order-0) page or the head page of a compound page.
+ *
+ * A folio is a physically, virtually and logically contiguous set
+ * of bytes. It is a power-of-two in size, and it is aligned to that
+ * same power-of-two. If it is found in the page cache, it is at a file
+ * offset which is a multiple of that power-of-two. It is at least as
+ * large as PAGE_SIZE.
+ */
+struct folio {
+ struct page page;
+};
+
+/**
+ * page_folio - Converts from page to folio.
+ * @page: The page.
+ *
+ * Every page is part of a folio. This function cannot be called on a
+ * NULL pointer.
+ *
+ * Context: No reference, nor lock is required on @page. If the caller
+ * does not hold a reference, this call may race with a folio split, so
+ * it should re-check the folio still contains this page after gaining
+ * a reference on the folio.
+ * Return: The folio which contains this page.
+ */
+static inline struct folio *page_folio(struct page *page)
+{
+ unsigned long head = READ_ONCE(page->compound_head);
+
+ if (unlikely(head & 1))
+ return (struct folio *)(head - 1);
+ return (struct folio *)page;
+}
+
static inline atomic_t *compound_mapcount_ptr(struct page *page)
{
return &page[1].compound_mapcount;
--
2.30.2
--
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