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 <kundan.kumar@xxxxxxxxxxx>
Tested-by: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Reviewed-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
block/bio.c | 23 +++++++++++++++++++++++
block/blk.h | 4 ++++
2 files changed, 27 insertions(+)
diff --git a/block/bio.c b/block/bio.c
index c4053d49679a..f9d759315f4d 100644
--- a/block/bio.c
+++ b/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
diff --git a/block/blk.h b/block/blk.h
index 1a1a18d118f7..c718e4291db0 100644
--- a/block/blk.h
+++ b/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.
--
2.25.1
