return atomic_read(&page->_refcount);
}
+/**
+ * folio_ref_count - The reference count on this folio.
+ * @folio: The folio.
+ *
+ * The refcount is usually incremented by calls to folio_get() and
+ * decremented by calls to folio_put(). Some typical users of the
+ * folio refcount:
+ *
+ * - Each reference from a page table
+ * - The page cache
+ * - Filesystem private data
+ * - The LRU list
+ * - Pipes
+ * - Direct IO which references this page in the process address space
+ *
+ * Return: The number of references to this folio.
+ */
+static inline int folio_ref_count(const struct folio *folio)
+{
+ return page_ref_count(&folio->page);
+}
+
static inline int page_count(const struct page *page)
{
- return atomic_read(&compound_head(page)->_refcount);
+ return folio_ref_count(page_folio(page));
}
static inline void set_page_count(struct page *page, int v)
__page_ref_set(page, v);
}
+static inline void folio_set_count(struct folio *folio, int v)
+{
+ set_page_count(&folio->page, v);
+}
+
/*
* Setup the page count before being freed into the page allocator for
* the first time (boot or memory hotplug)
__page_ref_mod(page, nr);
}
+static inline void folio_ref_add(struct folio *folio, int nr)
+{
+ page_ref_add(&folio->page, nr);
+}
+
static inline void page_ref_sub(struct page *page, int nr)
{
atomic_sub(nr, &page->_refcount);
__page_ref_mod(page, -nr);
}
+static inline void folio_ref_sub(struct folio *folio, int nr)
+{
+ page_ref_sub(&folio->page, nr);
+}
+
static inline int page_ref_sub_return(struct page *page, int nr)
{
int ret = atomic_sub_return(nr, &page->_refcount);
return ret;
}
+static inline int folio_ref_sub_return(struct folio *folio, int nr)
+{
+ return page_ref_sub_return(&folio->page, nr);
+}
+
static inline void page_ref_inc(struct page *page)
{
atomic_inc(&page->_refcount);
__page_ref_mod(page, 1);
}
+static inline void folio_ref_inc(struct folio *folio)
+{
+ page_ref_inc(&folio->page);
+}
+
static inline void page_ref_dec(struct page *page)
{
atomic_dec(&page->_refcount);
__page_ref_mod(page, -1);
}
+static inline void folio_ref_dec(struct folio *folio)
+{
+ page_ref_dec(&folio->page);
+}
+
static inline int page_ref_sub_and_test(struct page *page, int nr)
{
int ret = atomic_sub_and_test(nr, &page->_refcount);
return ret;
}
+static inline int folio_ref_sub_and_test(struct folio *folio, int nr)
+{
+ return page_ref_sub_and_test(&folio->page, nr);
+}
+
static inline int page_ref_inc_return(struct page *page)
{
int ret = atomic_inc_return(&page->_refcount);
return ret;
}
+static inline int folio_ref_inc_return(struct folio *folio)
+{
+ return page_ref_inc_return(&folio->page);
+}
+
static inline int page_ref_dec_and_test(struct page *page)
{
int ret = atomic_dec_and_test(&page->_refcount);
return ret;
}
+static inline int folio_ref_dec_and_test(struct folio *folio)
+{
+ return page_ref_dec_and_test(&folio->page);
+}
+
static inline int page_ref_dec_return(struct page *page)
{
int ret = atomic_dec_return(&page->_refcount);
return ret;
}
+static inline int folio_ref_dec_return(struct folio *folio)
+{
+ return page_ref_dec_return(&folio->page);
+}
+
static inline bool page_ref_add_unless(struct page *page, int nr, int u)
{
bool ret = atomic_add_unless(&page->_refcount, nr, u);
return ret;
}
+static inline bool folio_ref_add_unless(struct folio *folio, int nr, int u)
+{
+ return page_ref_add_unless(&folio->page, nr, u);
+}
+
static inline int page_ref_freeze(struct page *page, int count)
{
int ret = likely(atomic_cmpxchg(&page->_refcount, count, 0) == count);
return ret;
}
+static inline int folio_ref_freeze(struct folio *folio, int count)
+{
+ return page_ref_freeze(&folio->page, count);
+}
+
static inline void page_ref_unfreeze(struct page *page, int count)
{
VM_BUG_ON_PAGE(page_count(page) != 0, page);
__page_ref_unfreeze(page, count);
}
+static inline void folio_ref_unfreeze(struct folio *folio, int count)
+{
+ page_ref_unfreeze(&folio->page, count);
+}
#endif