scst: Port to kernel v4.13

git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@7240 d57e44dd-8a1f-0410-8b47-8ef2f437770f

scst/include/backport.h

@@ -20,6 +20,7 @@
  *  GNU General Public License for more details.
  */
 
+#include <linux/bio.h>
 #include <linux/blkdev.h>	/* struct request_queue */
 #include <linux/scatterlist.h>	/* struct scatterlist */
 #include <linux/slab.h>		/* kmalloc() */
@@ -45,6 +46,19 @@
 #endif
 #endif
 
+/* <linux/bio.h> */
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0)
+static inline struct bio_set *bioset_create_backport(unsigned int pool_size,
+						     unsigned int front_pad,
+						     int flags)
+{
+	WARN_ON_ONCE(flags != 0);
+	return bioset_create(pool_size, front_pad);
+}
+#define bioset_create bioset_create_backport
+#endif
+
 /* <linux/blkdev.h> */
 
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 31)

scst/include/scst.h

@@ -5499,6 +5499,7 @@ void scst_dev_inquiry_data_changed(struct scst_device *dev);
  * allows exclusive wake ups of threads in LIFO order. We need it to let (yet)
  * unneeded threads sleep and not pollute CPU cache by their stacks.
  */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0)
 static inline void prepare_to_wait_exclusive_head(wait_queue_head_t *q,
 						  wait_queue_t *wait, int state)
 {
@@ -5511,6 +5512,20 @@ static inline void prepare_to_wait_exclusive_head(wait_queue_head_t *q,
 	set_current_state(state);
 	spin_unlock_irqrestore(&q->lock, flags);
 }
+#else
+static inline void prepare_to_wait_exclusive_head(struct wait_queue_head *wq_head,
+				struct wait_queue_entry *wq_entry, int state)
+{
+	unsigned long flags;
+
+	wq_entry->flags |= WQ_FLAG_EXCLUSIVE;
+	spin_lock_irqsave(&wq_head->lock, flags);
+	if (list_empty(&wq_entry->entry))
+		__add_wait_queue(wq_head, wq_entry);
+	set_current_state(state);
+	spin_unlock_irqrestore(&wq_head->lock, flags);
+}
+#endif
 
 /**
  * wait_event_locked() - Wait until a condition becomes true.

scst/src/dev_handlers/scst_vdisk.c

@@ -6563,7 +6563,11 @@ static void blockio_endio(struct bio *bio, int error)
 #else
 static void blockio_endio(struct bio *bio)
 {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0)
 	int error = bio->bi_error;
+#else
+	int error = blk_status_to_errno(bio->bi_status);
+#endif
 #endif
 	struct scst_blockio_work *blockio_work = bio->bi_private;
 
@@ -7039,7 +7043,11 @@ static void vdev_flush_end_io(struct bio *bio, int error)
 #else
 static void vdev_flush_end_io(struct bio *bio)
 {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0)
 	int error = bio->bi_error;
+#else
+	int error = blk_status_to_errno(bio->bi_status);
+#endif
 #endif
 	struct scst_cmd *cmd = bio->bi_private;
 
@@ -7155,7 +7163,11 @@ static void blockio_end_sync_io(struct bio *bio, int error)
 #else
 static void blockio_end_sync_io(struct bio *bio)
 {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0)
 	int error = bio->bi_error;
+#else
+	int error = blk_status_to_errno(bio->bi_status);
+#endif
 #endif
 	struct bio_priv_sync *s = bio->bi_private;
 
@@ -7788,7 +7800,7 @@ static int vdisk_create_bioset(struct scst_vdisk_dev *virt_dev)
 	EXTRACHECKS_BUG_ON(virt_dev->vdisk_bioset || !virt_dev->blockio);
 
 	/* Pool size doesn't really matter */
-	virt_dev->vdisk_bioset = bioset_create(2, 0);
+	virt_dev->vdisk_bioset = bioset_create(2, 0, 0);
 	if (virt_dev->vdisk_bioset == NULL) {
 		PRINT_ERROR("Failed to create bioset (dev %s)", virt_dev->name);
 		res = -ENOMEM;

scst/src/scst_lib.c

@@ -7705,7 +7705,11 @@ static void blk_bio_map_kern_endio(struct bio *bio, int err)
 #else
 static void blk_bio_map_kern_endio(struct bio *bio)
 {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0)
 	int err = bio->bi_error;
+#else
+	int err = blk_status_to_errno(bio->bi_status);
+#endif
 #endif
 	struct blk_kern_sg_work *bw = bio->bi_private;
 
@@ -7857,22 +7861,33 @@ static struct request *blk_make_request(struct request_queue *q,
 	if (IS_ERR(rq))
 		return rq;
 
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 13, 0)
+	scsi_req_init(scsi_req(rq));
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
 	scsi_req_init(rq);
 #else
 	blk_rq_set_block_pc(rq);
 #endif
 
 	for_each_bio(bio) {
-		struct bio *bounce_bio = bio;
 		int ret;
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0)
+		struct bio *bounce_bio = bio;
+
 		blk_queue_bounce(q, &bounce_bio);
 		ret = blk_rq_append_bio(rq, bounce_bio);
 		if (unlikely(ret)) {
 			blk_put_request(rq);
 			return ERR_PTR(ret);
 		}
+#else
+		ret = blk_rq_append_bio(rq, bio);
+		if (unlikely(ret)) {
+			blk_put_request(rq);
+			return ERR_PTR(ret);
+		}
+#endif
 	}
 
 	return rq;
@@ -8071,7 +8086,9 @@ static struct request *blk_map_kern_sg(struct request_queue *q,
 		if (unlikely(!rq))
 			return ERR_PTR(-ENOMEM);
 
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 13, 0)
+		scsi_req_init(scsi_req(rq));
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
 		scsi_req_init(rq);
 #else
 		rq->cmd_type = REQ_TYPE_BLOCK_PC;
@@ -8257,7 +8274,11 @@ out:
 #endif /* !defined(SCSI_EXEC_REQ_FIFO_DEFINED) */
 
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30)
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0)
 static void scsi_end_async(struct request *req, int error)
+#else
+static void scsi_end_async(struct request *req, blk_status_t error)
+#endif
 {
 	struct scsi_io_context *sioc = req->end_io_data;
 
@@ -8406,7 +8427,11 @@ out_free_unmap:
 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0)
 		b->bi_end_io(b, res);
 #else
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0)
 		b->bi_error = res;
+#else
+		b->bi_status = errno_to_blk_status(res);
+#endif
 		b->bi_end_io(b);
 #endif
 	}