This is like read_cache_page_gfp() except it returns the folio instead
of the precise page.
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
include/linux/pagemap.h | 2 ++
mm/filemap.c | 24 ++++++++++++++++++++++++
2 files changed, 26 insertions(+)
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 47069662f4b8..cf0677419981 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -758,6 +758,8 @@ static inline struct page *grab_cache_page(struct address_space *mapping,
struct folio *read_cache_folio(struct address_space *, pgoff_t index,
filler_t *filler, struct file *file);
+struct folio *mapping_read_folio_gfp(struct address_space *, pgoff_t index,
+ gfp_t flags);
struct page *read_cache_page(struct address_space *, pgoff_t index,
filler_t *filler, struct file *file);
extern struct page * read_cache_page_gfp(struct address_space *mapping,
diff --git a/mm/filemap.c b/mm/filemap.c
index 992554c18f1f..2ebcf500871d 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -3585,6 +3585,30 @@ struct folio *read_cache_folio(struct address_space *mapping, pgoff_t index,
}
EXPORT_SYMBOL(read_cache_folio);
+/**
+ * mapping_read_folio_gfp - Read into page cache, using specified allocation flags.
+ * @mapping: The address_space for the folio.
+ * @index: The index that the allocated folio will contain.
+ * @gfp: The page allocator flags to use if allocating.
+ *
+ * This is the same as "read_cache_folio(mapping, index, NULL, NULL)", but with
+ * any new memory allocations done using the specified allocation flags.
+ *
+ * The most likely error from this function is EIO, but ENOMEM is
+ * possible and so is EINTR. If ->read_folio returns another error,
+ * that will be returned to the caller.
+ *
+ * The function expects mapping->invalidate_lock to be already held.
+ *
+ * Return: Uptodate folio on success, ERR_PTR() on failure.
+ */
+struct folio *mapping_read_folio_gfp(struct address_space *mapping,
+ pgoff_t index, gfp_t gfp)
+{
+ return do_read_cache_folio(mapping, index, NULL, NULL, gfp);
+}
+EXPORT_SYMBOL(mapping_read_folio_gfp);
+
static struct page *do_read_cache_page(struct address_space *mapping,
pgoff_t index, filler_t *filler, struct file *file, gfp_t gfp)
{
--
2.35.1
