Merge tag 'block-6.1-2022-11-25' of git://git.kernel.dk/linux

Pull block fixes from Jens Axboe:

 - A few fixes for s390 sads (Stefan, Colin)

 - Ensure that ublk doesn't reorder requests, as that can be problematic
   on devices that need specific ordering (Ming)

 - Fix a queue reference leak in disk allocation handling (Christoph)

* tag 'block-6.1-2022-11-25' of git://git.kernel.dk/linux:
  ublk_drv: don't forward io commands in reserve order
  s390/dasd: fix possible buffer overflow in copy_pair_show
  s390/dasd: fix no record found for raw_track_access
  s390/dasd: increase printing of debug data payload
  s390/dasd: Fix spelling mistake "Ivalid" -> "Invalid"
  blk-mq: fix queue reference leak on blk_mq_alloc_disk_for_queue failure

Author: torvalds

block/blk-mq.c

@@ -4045,9 +4045,14 @@ EXPORT_SYMBOL(__blk_mq_alloc_disk);
 struct gendisk *blk_mq_alloc_disk_for_queue(struct request_queue *q,
 		struct lock_class_key *lkclass)
 {
+	struct gendisk *disk;
+
 	if (!blk_get_queue(q))
 		return NULL;
-	return __alloc_disk_node(q, NUMA_NO_NODE, lkclass);
+	disk = __alloc_disk_node(q, NUMA_NO_NODE, lkclass);
+	if (!disk)
+		blk_put_queue(q);
+	return disk;
 }
 EXPORT_SYMBOL(blk_mq_alloc_disk_for_queue);
 

drivers/block/ublk_drv.c

@@ -57,10 +57,8 @@
 #define UBLK_PARAM_TYPE_ALL (UBLK_PARAM_TYPE_BASIC | UBLK_PARAM_TYPE_DISCARD)
 
 struct ublk_rq_data {
-	union {
-		struct callback_head work;
-		struct llist_node node;
-	};
+	struct llist_node node;
+	struct callback_head work;
 };
 
 struct ublk_uring_cmd_pdu {
@@ -766,30 +764,52 @@ static inline void __ublk_rq_task_work(struct request *req)
 	ubq_complete_io_cmd(io, UBLK_IO_RES_OK);
 }
 
+static inline void ublk_forward_io_cmds(struct ublk_queue *ubq)
+{
+	struct llist_node *io_cmds = llist_del_all(&ubq->io_cmds);
+	struct ublk_rq_data *data, *tmp;
+
+	io_cmds = llist_reverse_order(io_cmds);
+	llist_for_each_entry_safe(data, tmp, io_cmds, node)
+		__ublk_rq_task_work(blk_mq_rq_from_pdu(data));
+}
+
+static inline void ublk_abort_io_cmds(struct ublk_queue *ubq)
+{
+	struct llist_node *io_cmds = llist_del_all(&ubq->io_cmds);
+	struct ublk_rq_data *data, *tmp;
+
+	llist_for_each_entry_safe(data, tmp, io_cmds, node)
+		__ublk_abort_rq(ubq, blk_mq_rq_from_pdu(data));
+}
+
 static void ublk_rq_task_work_cb(struct io_uring_cmd *cmd)
 {
 	struct ublk_uring_cmd_pdu *pdu = ublk_get_uring_cmd_pdu(cmd);
 	struct ublk_queue *ubq = pdu->ubq;
-	struct llist_node *io_cmds = llist_del_all(&ubq->io_cmds);
-	struct ublk_rq_data *data;
 
-	llist_for_each_entry(data, io_cmds, node)
-		__ublk_rq_task_work(blk_mq_rq_from_pdu(data));
+	ublk_forward_io_cmds(ubq);
 }
 
 static void ublk_rq_task_work_fn(struct callback_head *work)
 {
 	struct ublk_rq_data *data = container_of(work,
 			struct ublk_rq_data, work);
 	struct request *req = blk_mq_rq_from_pdu(data);
+	struct ublk_queue *ubq = req->mq_hctx->driver_data;
 
-	__ublk_rq_task_work(req);
+	ublk_forward_io_cmds(ubq);
 }
 
-static void ublk_submit_cmd(struct ublk_queue *ubq, const struct request *rq)
+static void ublk_queue_cmd(struct ublk_queue *ubq, struct request *rq)
 {
-	struct ublk_io *io = &ubq->ios[rq->tag];
+	struct ublk_rq_data *data = blk_mq_rq_to_pdu(rq);
+	struct ublk_io *io;
 
+	if (!llist_add(&data->node, &ubq->io_cmds))
+		return;
+
+	io = &ubq->ios[rq->tag];
 	/*
 	 * If the check pass, we know that this is a re-issued request aborted
 	 * previously in monitor_work because the ubq_daemon(cmd's task) is
@@ -803,11 +823,11 @@ static void ublk_submit_cmd(struct ublk_queue *ubq, const struct request *rq)
 	 * guarantees that here is a re-issued request aborted previously.
 	 */
 	if (unlikely(io->flags & UBLK_IO_FLAG_ABORTED)) {
-		struct llist_node *io_cmds = llist_del_all(&ubq->io_cmds);
-		struct ublk_rq_data *data;
-
-		llist_for_each_entry(data, io_cmds, node)
-			__ublk_abort_rq(ubq, blk_mq_rq_from_pdu(data));
+		ublk_abort_io_cmds(ubq);
+	} else if (ublk_can_use_task_work(ubq)) {
+		if (task_work_add(ubq->ubq_daemon, &data->work,
+					TWA_SIGNAL_NO_IPI))
+			ublk_abort_io_cmds(ubq);
 	} else {
 		struct io_uring_cmd *cmd = io->cmd;
 		struct ublk_uring_cmd_pdu *pdu = ublk_get_uring_cmd_pdu(cmd);
@@ -817,23 +837,6 @@ static void ublk_submit_cmd(struct ublk_queue *ubq, const struct request *rq)
 	}
 }
 
-static void ublk_queue_cmd(struct ublk_queue *ubq, struct request *rq,
-		bool last)
-{
-	struct ublk_rq_data *data = blk_mq_rq_to_pdu(rq);
-
-	if (ublk_can_use_task_work(ubq)) {
-		enum task_work_notify_mode notify_mode = last ?
-			TWA_SIGNAL_NO_IPI : TWA_NONE;
-
-		if (task_work_add(ubq->ubq_daemon, &data->work, notify_mode))
-			__ublk_abort_rq(ubq, rq);
-	} else {
-		if (llist_add(&data->node, &ubq->io_cmds))
-			ublk_submit_cmd(ubq, rq);
-	}
-}
-
 static blk_status_t ublk_queue_rq(struct blk_mq_hw_ctx *hctx,
 		const struct blk_mq_queue_data *bd)
 {
@@ -865,19 +868,11 @@ static blk_status_t ublk_queue_rq(struct blk_mq_hw_ctx *hctx,
 		return BLK_STS_OK;
 	}
 
-	ublk_queue_cmd(ubq, rq, bd->last);
+	ublk_queue_cmd(ubq, rq);
 
 	return BLK_STS_OK;
 }
 
-static void ublk_commit_rqs(struct blk_mq_hw_ctx *hctx)
-{
-	struct ublk_queue *ubq = hctx->driver_data;
-
-	if (ublk_can_use_task_work(ubq))
-		__set_notify_signal(ubq->ubq_daemon);
-}
-
 static int ublk_init_hctx(struct blk_mq_hw_ctx *hctx, void *driver_data,
 		unsigned int hctx_idx)
 {
@@ -899,7 +894,6 @@ static int ublk_init_rq(struct blk_mq_tag_set *set, struct request *req,
 
 static const struct blk_mq_ops ublk_mq_ops = {
 	.queue_rq       = ublk_queue_rq,
-	.commit_rqs     = ublk_commit_rqs,
 	.init_hctx	= ublk_init_hctx,
 	.init_request   = ublk_init_rq,
 };
@@ -1197,7 +1191,7 @@ static void ublk_handle_need_get_data(struct ublk_device *ub, int q_id,
 	struct ublk_queue *ubq = ublk_get_queue(ub, q_id);
 	struct request *req = blk_mq_tag_to_rq(ub->tag_set.tags[q_id], tag);
 
-	ublk_queue_cmd(ubq, req, true);
+	ublk_queue_cmd(ubq, req);
 }
 
 static int ublk_ch_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags)

drivers/s390/block/dasd_devmap.c

@@ -1954,7 +1954,7 @@ dasd_copy_pair_show(struct device *dev,
 			break;
 		}
 	}
-	if (!copy->entry[i].primary)
+	if (i == DASD_CP_ENTRIES)
 		goto out;
 
 	/* print all secondary */

drivers/s390/block/dasd_eckd.c

@@ -4722,7 +4722,6 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_raw(struct dasd_device *startdev,
 	struct dasd_device *basedev;
 	struct req_iterator iter;
 	struct dasd_ccw_req *cqr;
-	unsigned int first_offs;
 	unsigned int trkcount;
 	unsigned long *idaws;
 	unsigned int size;
@@ -4756,7 +4755,6 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_raw(struct dasd_device *startdev,
 	last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
 		DASD_RAW_SECTORS_PER_TRACK;
 	trkcount = last_trk - first_trk + 1;
-	first_offs = 0;
 
 	if (rq_data_dir(req) == READ)
 		cmd = DASD_ECKD_CCW_READ_TRACK;
@@ -4800,13 +4798,13 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_raw(struct dasd_device *startdev,
 
 	if (use_prefix) {
 		prefix_LRE(ccw++, data, first_trk, last_trk, cmd, basedev,
-			   startdev, 1, first_offs + 1, trkcount, 0, 0);
+			   startdev, 1, 0, trkcount, 0, 0);
 	} else {
 		define_extent(ccw++, data, first_trk, last_trk, cmd, basedev, 0);
 		ccw[-1].flags |= CCW_FLAG_CC;
 
 		data += sizeof(struct DE_eckd_data);
-		locate_record_ext(ccw++, data, first_trk, first_offs + 1,
+		locate_record_ext(ccw++, data, first_trk, 0,
 				  trkcount, cmd, basedev, 0, 0);
 	}
 
@@ -5500,7 +5498,7 @@ dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
  * Dump the range of CCWs into 'page' buffer
  * and return number of printed chars.
  */
-static int
+static void
 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
 {
 	int len, count;
@@ -5518,16 +5516,21 @@ dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
 		else
 			datap = (char *) ((addr_t) from->cda);
 
-		/* dump data (max 32 bytes) */
-		for (count = 0; count < from->count && count < 32; count++) {
-			if (count % 8 == 0) len += sprintf(page + len, " ");
-			if (count % 4 == 0) len += sprintf(page + len, " ");
+		/* dump data (max 128 bytes) */
+		for (count = 0; count < from->count && count < 128; count++) {
+			if (count % 32 == 0)
+				len += sprintf(page + len, "\n");
+			if (count % 8 == 0)
+				len += sprintf(page + len, " ");
+			if (count % 4 == 0)
+				len += sprintf(page + len, " ");
 			len += sprintf(page + len, "%02x", datap[count]);
 		}
 		len += sprintf(page + len, "\n");
 		from++;
 	}
-	return len;
+	if (len > 0)
+		printk(KERN_ERR "%s", page);
 }
 
 static void
@@ -5619,37 +5622,33 @@ static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
 	if (req) {
 		/* req == NULL for unsolicited interrupts */
 		/* dump the Channel Program (max 140 Bytes per line) */
-		/* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
+		/* Count CCW and print first CCWs (maximum 7) */
 		first = req->cpaddr;
 		for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
 		to = min(first + 6, last);
-		len = sprintf(page, PRINTK_HEADER
-			      " Related CP in req: %p\n", req);
-		dasd_eckd_dump_ccw_range(first, to, page + len);
-		printk(KERN_ERR "%s", page);
+		printk(KERN_ERR PRINTK_HEADER " Related CP in req: %p\n", req);
+		dasd_eckd_dump_ccw_range(first, to, page);
 
 		/* print failing CCW area (maximum 4) */
 		/* scsw->cda is either valid or zero  */
-		len = 0;
 		from = ++to;
 		fail = (struct ccw1 *)(addr_t)
 				irb->scsw.cmd.cpa; /* failing CCW */
 		if (from <  fail - 2) {
 			from = fail - 2;     /* there is a gap - print header */
-			len += sprintf(page, PRINTK_HEADER "......\n");
+			printk(KERN_ERR PRINTK_HEADER "......\n");
 		}
 		to = min(fail + 1, last);
-		len += dasd_eckd_dump_ccw_range(from, to, page + len);
+		dasd_eckd_dump_ccw_range(from, to, page + len);
 
 		/* print last CCWs (maximum 2) */
+		len = 0;
 		from = max(from, ++to);
 		if (from < last - 1) {
 			from = last - 1;     /* there is a gap - print header */
-			len += sprintf(page + len, PRINTK_HEADER "......\n");
+			printk(KERN_ERR PRINTK_HEADER "......\n");
 		}
-		len += dasd_eckd_dump_ccw_range(from, last, page + len);
-		if (len > 0)
-			printk(KERN_ERR "%s", page);
+		dasd_eckd_dump_ccw_range(from, last, page + len);
 	}
 	free_page((unsigned long) page);
 }

drivers/s390/block/dasd_ioctl.c

@@ -401,7 +401,7 @@ dasd_ioctl_copy_pair_swap(struct block_device *bdev, void __user *argp)
 		return -EFAULT;
 	}
 	if (memchr_inv(data.reserved, 0, sizeof(data.reserved))) {
-		pr_warn("%s: Ivalid swap data specified.\n",
+		pr_warn("%s: Invalid swap data specified\n",
 			dev_name(&device->cdev->dev));
 		dasd_put_device(device);
 		return DASD_COPYPAIRSWAP_INVALID;