Add helpers to determine if a page or folio is a device dax or fs dax
page or folio.
Signed-off-by: Alistair Popple <apop...@nvidia.com>
---
include/linux/memremap.h | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/include/linux/memremap.h b/include/linux/memremap.h
index 0256a42..f2a8d13 100644
--- a/include/linux/memremap.h
+++ b/include/linux/memremap.h
@@ -187,6 +187,28 @@ static inline bool folio_is_device_coherent(const struct
folio *folio)
return is_device_coherent_page(&folio->page);
}
+static inline bool is_fsdax_page(const struct page *page)
+{
+ return is_zone_device_page(page) &&
+ page_pgmap(page)->type == MEMORY_DEVICE_FS_DAX;
+}
+
+static inline bool folio_is_fsdax(const struct folio *folio)
+{
+ return is_fsdax_page(&folio->page);
+}
+
+static inline bool is_device_dax_page(const struct page *page)
+{
+ return is_zone_device_page(page) &&
+ page_pgmap(page)->type == MEMORY_DEVICE_GENERIC;
+}
+
+static inline bool folio_is_device_dax(const struct folio *folio)
+{
+ return is_device_dax_page(&folio->page);
+}
+
#ifdef CONFIG_ZONE_DEVICE
void zone_device_page_init(struct page *page);
void *memremap_pages(struct dev_pagemap *pgmap, int nid);
--
git-series 0.9.1
