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Message-Id: <20210331184728.1188084-6-willy@infradead.org>
Date: Wed, 31 Mar 2021 19:47:06 +0100
From: "Matthew Wilcox (Oracle)" <willy@...radead.org>
To: linux-mm@...ck.org
Cc: "Matthew Wilcox (Oracle)" <willy@...radead.org>,
linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-cachefs@...hat.com, linux-afs@...ts.infradead.org
Subject: [PATCH v6 05/27] mm: Add folio reference count functions
These functions mirror their page reference counterparts.
Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
Documentation/core-api/mm-api.rst | 1 +
include/linux/page_ref.h | 88 ++++++++++++++++++++++++++++++-
2 files changed, 88 insertions(+), 1 deletion(-)
diff --git a/Documentation/core-api/mm-api.rst b/Documentation/core-api/mm-api.rst
index 34f46df91a8b..1ead2570b217 100644
--- a/Documentation/core-api/mm-api.rst
+++ b/Documentation/core-api/mm-api.rst
@@ -97,3 +97,4 @@ More Memory Management Functions
:internal:
.. kernel-doc:: include/linux/mm.h
:internal:
+.. kernel-doc:: include/linux/page_ref.h
diff --git a/include/linux/page_ref.h b/include/linux/page_ref.h
index f3318f34fc54..f27005e760fd 100644
--- a/include/linux/page_ref.h
+++ b/include/linux/page_ref.h
@@ -69,7 +69,29 @@ static inline int page_ref_count(struct page *page)
static inline int page_count(struct page *page)
{
- return atomic_read(&compound_head(page)->_refcount);
+ return page_ref_count(compound_head(page));
+}
+
+/**
+ * folio_ref_count - The reference count on this folio.
+ * @folio: The folio.
+ *
+ * The refcount is usually incremented by calls to get_folio() and
+ * decremented by calls to put_folio(). 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(struct folio *folio)
+{
+ return page_ref_count(&folio->page);
}
static inline void set_page_count(struct page *page, int v)
@@ -79,6 +101,11 @@ static inline void set_page_count(struct page *page, int v)
__page_ref_set(page, v);
}
+static inline void set_folio_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)
@@ -95,6 +122,11 @@ static inline void page_ref_add(struct page *page, int nr)
__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);
@@ -102,6 +134,11 @@ static inline void page_ref_sub(struct page *page, int nr)
__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);
@@ -111,6 +148,11 @@ static inline int page_ref_sub_return(struct page *page, int nr)
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);
@@ -118,6 +160,11 @@ static inline void page_ref_inc(struct page *page)
__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);
@@ -125,6 +172,11 @@ static inline void page_ref_dec(struct page *page)
__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);
@@ -134,6 +186,11 @@ static inline int page_ref_sub_and_test(struct page *page, int nr)
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);
@@ -143,6 +200,11 @@ static inline int page_ref_inc_return(struct page *page)
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);
@@ -152,6 +214,11 @@ static inline int page_ref_dec_and_test(struct page *page)
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);
@@ -161,6 +228,11 @@ static inline int page_ref_dec_return(struct page *page)
return ret;
}
+static inline int folio_ref_dec_return(struct folio *folio)
+{
+ return page_ref_dec_return(&folio->page);
+}
+
static inline int page_ref_add_unless(struct page *page, int nr, int u)
{
int ret = atomic_add_unless(&page->_refcount, nr, u);
@@ -170,6 +242,11 @@ static inline int page_ref_add_unless(struct page *page, int nr, int u)
return ret;
}
+static inline int 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);
@@ -179,6 +256,11 @@ static inline int page_ref_freeze(struct page *page, int 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);
@@ -189,4 +271,8 @@ static inline void page_ref_unfreeze(struct page *page, int count)
__page_ref_unfreeze(page, count);
}
+static inline void folio_ref_unfreeze(struct folio *folio, int count)
+{
+ page_ref_unfreeze(&folio->page, count);
+}
#endif
--
2.30.2
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