[PATCH 2/7] mm: make mapping_get_entry available outside of filemap.c

Christoph Hellwig
2023-03-07T14:38:59Z

mapping_get_entry is useful for page cache API users that need to know
about xa_value internals. Rename it and make it available in pagemap.h.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
include/linux/pagemap.h | 1 +
mm/filemap.c | 6 +++---
2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 0acb8e1fb7afdc..5d9b51d3854220 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -507,6 +507,7 @@ pgoff_t page_cache_prev_miss(struct address_space *mapping,
#define FGP_ENTRY 0x00000080
#define FGP_STABLE 0x00000100

+void *filemap_get_entry(struct address_space *mapping, pgoff_t index);
struct folio *__filemap_get_folio(struct address_space *mapping, pgoff_t index,
int fgp_flags, gfp_t gfp);
struct page *pagecache_get_page(struct address_space *mapping, pgoff_t index,
diff --git a/mm/filemap.c b/mm/filemap.c
index 2723104cc06a12..a674108a4d524b 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1836,7 +1836,7 @@ EXPORT_SYMBOL(page_cache_prev_miss);
*/

/*
- * mapping_get_entry - Get a page cache entry.
+ * filemap_get_entry - Get a page cache entry.
* @mapping: the address_space to search
* @index: The page cache index.
*
@@ -1847,7 +1847,7 @@ EXPORT_SYMBOL(page_cache_prev_miss);
*
* Return: The folio, swap or shadow entry, %NULL if nothing is found.
*/
-static void *mapping_get_entry(struct address_space *mapping, pgoff_t index)
+void *filemap_get_entry(struct address_space *mapping, pgoff_t index)
{
XA_STATE(xas, &mapping->i_pages, index);
struct folio *folio;
@@ -1917,7 +1917,7 @@ struct folio *__filemap_get_folio(struct address_space *mapping, pgoff_t index,
struct folio *folio;

repeat:
- folio = mapping_get_entry(mapping, index);
+ folio = filemap_get_entry(mapping, index);
if (xa_is_value(folio)) {
if (fgp_flags & FGP_ENTRY)
return folio;
--
2.39.1