1 files changed, 45 insertions, 15 deletions

diff --git a/block/blk.h b/block/blk.h
index e4c433f62dfc..f6053e9dd2aa 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -208,10 +208,14 @@ static inline unsigned int blk_queue_get_max_sectors(struct request *rq)
 	struct request_queue *q = rq->q;
 	enum req_op op = req_op(rq);
 
-	if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE))
+	if (unlikely(op == REQ_OP_DISCARD))
 		return min(q->limits.max_discard_sectors,
 			   UINT_MAX >> SECTOR_SHIFT);
 
+	if (unlikely(op == REQ_OP_SECURE_ERASE))
+		return min(q->limits.max_secure_erase_sectors,
+			   UINT_MAX >> SECTOR_SHIFT);
+
 	if (unlikely(op == REQ_OP_WRITE_ZEROES))
 		return q->limits.max_write_zeroes_sectors;
 
@@ -371,12 +375,18 @@ struct bio *bio_split_zone_append(struct bio *bio,
 static inline bool bio_may_need_split(struct bio *bio,
 		const struct queue_limits *lim)
 {
+	const struct bio_vec *bv;
+
 	if (lim->chunk_sectors)
 		return true;
-	if (bio->bi_vcnt != 1)
+
+	if (!bio->bi_io_vec)
 		return true;
-	return bio->bi_io_vec->bv_len + bio->bi_io_vec->bv_offset >
-		lim->max_fast_segment_size;
+
+	bv = __bvec_iter_bvec(bio->bi_io_vec, bio->bi_iter);
+	if (bio->bi_iter.bi_size > bv->bv_len - bio->bi_iter.bi_bvec_done)
+		return true;
+	return bv->bv_len + bv->bv_offset > lim->max_fast_segment_size;
 }
 
 /**
@@ -589,17 +599,6 @@ void bdev_set_nr_sectors(struct block_device *bdev, sector_t sectors);
 
 struct gendisk *__alloc_disk_node(struct request_queue *q, int node_id,
 		struct lock_class_key *lkclass);
-
-/*
- * Clean up a page appropriately, where the page may be pinned, may have a
- * ref taken on it or neither.
- */
-static inline void bio_release_page(struct bio *bio, struct page *page)
-{
-	if (bio_flagged(bio, BIO_PAGE_PINNED))
-		unpin_user_page(page);
-}
-
 struct request_queue *blk_alloc_queue(struct queue_limits *lim, int node_id);
 
 int disk_scan_partitions(struct gendisk *disk, blk_mode_t mode);
@@ -730,4 +729,35 @@ static inline void blk_unfreeze_release_lock(struct request_queue *q)
 }
 #endif
 
+/*
+ * debugfs directory and file creation can trigger fs reclaim, which can enter
+ * back into the block layer request_queue. This can cause deadlock if the
+ * queue is frozen. Use NOIO context together with debugfs_mutex to prevent fs
+ * reclaim from triggering block I/O.
+ */
+static inline void blk_debugfs_lock_nomemsave(struct request_queue *q)
+{
+	mutex_lock(&q->debugfs_mutex);
+}
+
+static inline void blk_debugfs_unlock_nomemrestore(struct request_queue *q)
+{
+	mutex_unlock(&q->debugfs_mutex);
+}
+
+static inline unsigned int __must_check blk_debugfs_lock(struct request_queue *q)
+{
+	unsigned int memflags = memalloc_noio_save();
+
+	blk_debugfs_lock_nomemsave(q);
+	return memflags;
+}
+
+static inline void blk_debugfs_unlock(struct request_queue *q,
+				      unsigned int memflags)
+{
+	blk_debugfs_unlock_nomemrestore(q);
+	memalloc_noio_restore(memflags);
+}
+
 #endif /* BLK_INTERNAL_H */