Merge branch 'userns-for-v5.12' of git://git.kernel.org/pub/scm/linux/kernel/git...

[linux-2.6-microblaze.git] / block / bio.c

diff --git a/block/bio.c b/block/bio.c
index a0eabe2..a1c4d29 100644 (file)
--- a/block/bio.c
+++ b/block/bio.c
@@ -807,6 +807,39 @@ int bio_add_pc_page(struct request_queue *q, struct bio *bio,
 }
 EXPORT_SYMBOL(bio_add_pc_page);
 
+/**
+ * bio_add_zone_append_page - attempt to add page to zone-append bio
+ * @bio: destination bio
+ * @page: page to add
+ * @len: vec entry length
+ * @offset: vec entry offset
+ *
+ * Attempt to add a page to the bio_vec maplist of a bio that will be submitted
+ * for a zone-append request. This can fail for a number of reasons, such as the
+ * bio being full or the target block device is not a zoned block device or
+ * other limitations of the target block device. The target block device must
+ * allow bio's up to PAGE_SIZE, so it is always possible to add a single page
+ * to an empty bio.
+ *
+ * Returns: number of bytes added to the bio, or 0 in case of a failure.
+ */
+int bio_add_zone_append_page(struct bio *bio, struct page *page,
+                            unsigned int len, unsigned int offset)
+{
+       struct request_queue *q = bio->bi_bdev->bd_disk->queue;
+       bool same_page = false;
+
+       if (WARN_ON_ONCE(bio_op(bio) != REQ_OP_ZONE_APPEND))
+               return 0;
+
+       if (WARN_ON_ONCE(!blk_queue_is_zoned(q)))
+               return 0;
+
+       return bio_add_hw_page(q, bio, page, len, offset,
+                              queue_max_zone_append_sectors(q), &same_page);
+}
+EXPORT_SYMBOL_GPL(bio_add_zone_append_page);
+
 /**
  * __bio_try_merge_page - try appending data to an existing bvec.
  * @bio: destination bio