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authorJohannes Thumshirn <johannes.thumshirn@wdc.com>2021-02-04 19:21:40 +0900
committerDavid Sterba <dsterba@suse.com>2021-02-09 00:52:19 +0100
commitae29333fa644679b96d88c9dd3afbef25cbac0f6 (patch)
tree76a1b371e413ffc649dab57d842ad9bde5e04227 /block/bio.c
parent72c9925f87c8b74f36f8e75a4cd93d964538d3ca (diff)
block: add bio_add_zone_append_page
Add bio_add_zone_append_page(), a wrapper around bio_add_hw_page() which is intended to be used by file systems that directly add pages to a bio instead of using bio_iov_iter_get_pages(). Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Acked-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'block/bio.c')
-rw-r--r--block/bio.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/block/bio.c b/block/bio.c
index 1f2cc1fbe283..2f21d2958b60 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -852,6 +852,39 @@ 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_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
* @page: start page to add