Merge tag 'block-6.15-20250424' of git://git.kernel.dk/linux

Pull block fixes from Jens Axboe:

 - Fix autoloading of drivers from stat*(2)

 - Fix losing read-ahead setting one suspend/resume, when a device is
   re-probed.

 - Fix race between setting the block size and page cache updates.
   Includes a helper that a coming XFS fix will use as well.

 - ublk cancelation fixes.

 - ublk selftest additions and fixes.

 - NVMe pull via Christoph:
      - fix an out-of-bounds access in nvmet_enable_port (Richard
        Weinberger)

* tag 'block-6.15-20250424' of git://git.kernel.dk/linux:
  ublk: fix race between io_uring_cmd_complete_in_task and ublk_cancel_cmd
  ublk: call ublk_dispatch_req() for handling UBLK_U_IO_NEED_GET_DATA
  block: don't autoload drivers on blk-cgroup configuration
  block: don't autoload drivers on stat
  block: remove the backing_inode variable in bdev_statx
  block: move blkdev_{get,put} _no_open prototypes out of blkdev.h
  block: never reduce ra_pages in blk_apply_bdi_limits
  selftests: ublk: common: fix _get_disk_dev_t for pre-9.0 coreutils
  selftests: ublk: remove useless 'delay_us' from 'struct dev_ctx'
  selftests: ublk: fix recover test
  block: hoist block size validation code to a separate function
  block: fix race between set_blocksize and read paths
  nvmet: fix out-of-bounds access in nvmet_enable_port

2 files changed, 27 insertions, 17 deletions

diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
index 2de7b2bd409d..40f971a66d3e 100644
--- a/drivers/block/ublk_drv.c
+++ b/drivers/block/ublk_drv.c
@@ -1683,14 +1683,31 @@ static void ublk_start_cancel(struct ublk_queue *ubq)
 	ublk_put_disk(disk);
 }
 
-static void ublk_cancel_cmd(struct ublk_queue *ubq, struct ublk_io *io,
+static void ublk_cancel_cmd(struct ublk_queue *ubq, unsigned tag,
 		unsigned int issue_flags)
 {
+	struct ublk_io *io = &ubq->ios[tag];
+	struct ublk_device *ub = ubq->dev;
+	struct request *req;
 	bool done;
 
 	if (!(io->flags & UBLK_IO_FLAG_ACTIVE))
 		return;
 
+	/*
+	 * Don't try to cancel this command if the request is started for
+	 * avoiding race between io_uring_cmd_done() and
+	 * io_uring_cmd_complete_in_task().
+	 *
+	 * Either the started request will be aborted via __ublk_abort_rq(),
+	 * then this uring_cmd is canceled next time, or it will be done in
+	 * task work function ublk_dispatch_req() because io_uring guarantees
+	 * that ublk_dispatch_req() is always called
+	 */
+	req = blk_mq_tag_to_rq(ub->tag_set.tags[ubq->q_id], tag);
+	if (req && blk_mq_request_started(req))
+		return;
+
 	spin_lock(&ubq->cancel_lock);
 	done = !!(io->flags & UBLK_IO_FLAG_CANCELED);
 	if (!done)
@@ -1722,7 +1739,6 @@ static void ublk_uring_cmd_cancel_fn(struct io_uring_cmd *cmd,
 	struct ublk_uring_cmd_pdu *pdu = ublk_get_uring_cmd_pdu(cmd);
 	struct ublk_queue *ubq = pdu->ubq;
 	struct task_struct *task;
-	struct ublk_io *io;
 
 	if (WARN_ON_ONCE(!ubq))
 		return;
@@ -1737,9 +1753,8 @@ static void ublk_uring_cmd_cancel_fn(struct io_uring_cmd *cmd,
 	if (!ubq->canceling)
 		ublk_start_cancel(ubq);
 
-	io = &ubq->ios[pdu->tag];
-	WARN_ON_ONCE(io->cmd != cmd);
-	ublk_cancel_cmd(ubq, io, issue_flags);
+	WARN_ON_ONCE(ubq->ios[pdu->tag].cmd != cmd);
+	ublk_cancel_cmd(ubq, pdu->tag, issue_flags);
 }
 
 static inline bool ublk_queue_ready(struct ublk_queue *ubq)
@@ -1752,7 +1767,7 @@ static void ublk_cancel_queue(struct ublk_queue *ubq)
 	int i;
 
 	for (i = 0; i < ubq->q_depth; i++)
-		ublk_cancel_cmd(ubq, &ubq->ios[i], IO_URING_F_UNLOCKED);
+		ublk_cancel_cmd(ubq, i, IO_URING_F_UNLOCKED);
 }
 
 /* Cancel all pending commands, must be called after del_gendisk() returns */
@@ -1886,15 +1901,6 @@ static void ublk_mark_io_ready(struct ublk_device *ub, struct ublk_queue *ubq)
 	}
 }
 
-static void ublk_handle_need_get_data(struct ublk_device *ub, int q_id,
-		int tag)
-{
-	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);
-}
-
 static inline int ublk_check_cmd_op(u32 cmd_op)
 {
 	u32 ioc_type = _IOC_TYPE(cmd_op);
@@ -2103,8 +2109,9 @@ static int __ublk_ch_uring_cmd(struct io_uring_cmd *cmd,
 		if (!(io->flags & UBLK_IO_FLAG_OWNED_BY_SRV))
 			goto out;
 		ublk_fill_io_cmd(io, cmd, ub_cmd->addr);
-		ublk_handle_need_get_data(ub, ub_cmd->q_id, ub_cmd->tag);
-		break;
+		req = blk_mq_tag_to_rq(ub->tag_set.tags[ub_cmd->q_id], tag);
+		ublk_dispatch_req(ubq, req, issue_flags);
+		return -EIOCBQUEUED;
 	default:
 		goto out;
 	}
diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c
index 71f8d06998d6..245475c43127 100644
--- a/drivers/nvme/target/core.c
+++ b/drivers/nvme/target/core.c
@@ -324,6 +324,9 @@ int nvmet_enable_port(struct nvmet_port *port)
 
 	lockdep_assert_held(&nvmet_config_sem);
 
+	if (port->disc_addr.trtype == NVMF_TRTYPE_MAX)
+		return -EINVAL;
+
 	ops = nvmet_transports[port->disc_addr.trtype];
 	if (!ops) {
 		up_write(&nvmet_config_sem);