block: Added folio-ized version of bio_add_hw_page()

Added new bio_add_hw_folio() function as a wrapper around
bio_add_hw_page(). This is a prep patch.

Signed-off-by: Kundan Kumar <[email protected]>
Tested-by: Luis Chamberlain <[email protected]>
Reviewed-by: Matthew Wilcox (Oracle) <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

Author: Kundan Kumar

block/bio.c

@@ -1016,6 +1016,29 @@ int bio_add_hw_page(struct request_queue *q, struct bio *bio,
 	return len;
 }
 
+/**
+ * bio_add_hw_folio - attempt to add a folio to a bio with hw constraints
+ * @q: the target queue
+ * @bio: destination bio
+ * @folio: folio to add
+ * @len: vec entry length
+ * @offset: vec entry offset in the folio
+ * @max_sectors: maximum number of sectors that can be added
+ * @same_page: return if the segment has been merged inside the same folio
+ *
+ * Add a folio to a bio while respecting the hardware max_sectors, max_segment
+ * and gap limitations.
+ */
+int bio_add_hw_folio(struct request_queue *q, struct bio *bio,
+		struct folio *folio, size_t len, size_t offset,
+		unsigned int max_sectors, bool *same_page)
+{
+	if (len > UINT_MAX || offset > UINT_MAX)
+		return 0;
+	return bio_add_hw_page(q, bio, folio_page(folio, 0), len, offset,
+			       max_sectors, same_page);
+}
+
 /**
  * bio_add_pc_page	- attempt to add page to passthrough bio
  * @q: the target queue

block/blk.h

@@ -574,6 +574,10 @@ int bio_add_hw_page(struct request_queue *q, struct bio *bio,
 		struct page *page, unsigned int len, unsigned int offset,
 		unsigned int max_sectors, bool *same_page);
 
+int bio_add_hw_folio(struct request_queue *q, struct bio *bio,
+		struct folio *folio, size_t len, size_t offset,
+		unsigned int max_sectors, bool *same_page);
+
 /*
  * Clean up a page appropriately, where the page may be pinned, may have a
  * ref taken on it or neither.