for-linus-20190802

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Merge tag 'for-linus-20190802' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:
 "Here's a small collection of fixes that should go into this series.
  This contains:

   - io_uring potential use-after-free fix (Jackie)

   - loop regression fix (Jan)

   - O_DIRECT fragmented bio regression fix (Damien)

   - Mark Denis as the new floppy maintainer (Denis)

   - ataflop switch fall-through annotation (Gustavo)

   - libata zpodd overflow fix (Kees)

   - libata ahci deferred probe fix (Miquel)

   - nbd invalidation BUG_ON() fix (Munehisa)

   - dasd endless loop fix (Stefan)"

* tag 'for-linus-20190802' of git://git.kernel.dk/linux-block:
  s390/dasd: fix endless loop after read unit address configuration
  block: Fix __blkdev_direct_IO() for bio fragments
  MAINTAINERS: floppy: take over maintainership
  nbd: replace kill_bdev() with __invalidate_device() again
  ata: libahci: do not complain in case of deferred probe
  io_uring: fix KASAN use after free in io_sq_wq_submit_work
  loop: Fix mount(2) failure due to race with LOOP_SET_FD
  libata: zpodd: Fix small read overflow in zpodd_get_mech_type()
  ataflop: Mark expected switch fall-through

MAINTAINERS

@@ -6322,7 +6322,8 @@ F:	Documentation/devicetree/bindings/counter/ftm-quaddec.txt
 F:	drivers/counter/ftm-quaddec.c
 
 FLOPPY DRIVER
-S:	Orphan
+M:	Denis Efremov <efremov@linux.com>
+S:	Odd Fixes
 L:	linux-block@vger.kernel.org
 F:	drivers/block/floppy.c
 

drivers/ata/libahci_platform.c

@@ -338,6 +338,9 @@ static int ahci_platform_get_phy(struct ahci_host_priv *hpriv, u32 port,
 		hpriv->phys[port] = NULL;
 		rc = 0;
 		break;
+	case -EPROBE_DEFER:
+		/* Do not complain yet */
+		break;
 
 	default:
 		dev_err(dev,

drivers/ata/libata-zpodd.c

@@ -56,7 +56,7 @@ static enum odd_mech_type zpodd_get_mech_type(struct ata_device *dev)
 	unsigned int ret;
 	struct rm_feature_desc *desc;
 	struct ata_taskfile tf;
-	static const char cdb[] = {  GPCMD_GET_CONFIGURATION,
+	static const char cdb[ATAPI_CDB_LEN] = {  GPCMD_GET_CONFIGURATION,
 			2,      /* only 1 feature descriptor requested */
 			0, 3,   /* 3, removable medium feature */
 			0, 0, 0,/* reserved */

drivers/block/ataflop.c

@@ -1726,6 +1726,7 @@ static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode,
 		/* MSch: invalidate default_params */
 		default_params[drive].blocks  = 0;
 		set_capacity(floppy->disk, MAX_DISK_SIZE * 2);
+		/* Fall through */
 	case FDFMTEND:
 	case FDFLUSH:
 		/* invalidate the buffer track to force a reread */

drivers/block/loop.c

@@ -924,6 +924,7 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
 	struct file	*file;
 	struct inode	*inode;
 	struct address_space *mapping;
+	struct block_device *claimed_bdev = NULL;
 	int		lo_flags = 0;
 	int		error;
 	loff_t		size;
@@ -942,10 +943,11 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
 	 * here to avoid changing device under exclusive owner.
 	 */
 	if (!(mode & FMODE_EXCL)) {
-		bdgrab(bdev);
+		claimed_bdev = bd_start_claiming(bdev, loop_set_fd);
-		error = blkdev_get(bdev, mode | FMODE_EXCL, loop_set_fd);
+		if (IS_ERR(claimed_bdev)) {
-		if (error)
+			error = PTR_ERR(claimed_bdev);
 			goto out_putf;
+		}
 	}
 
 	error = mutex_lock_killable(&loop_ctl_mutex);
@@ -1015,15 +1017,15 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
 	mutex_unlock(&loop_ctl_mutex);
 	if (partscan)
 		loop_reread_partitions(lo, bdev);
-	if (!(mode & FMODE_EXCL))
+	if (claimed_bdev)
-		blkdev_put(bdev, mode | FMODE_EXCL);
+		bd_abort_claiming(bdev, claimed_bdev, loop_set_fd);
 	return 0;
 
 out_unlock:
 	mutex_unlock(&loop_ctl_mutex);
 out_bdev:
-	if (!(mode & FMODE_EXCL))
+	if (claimed_bdev)
-		blkdev_put(bdev, mode | FMODE_EXCL);
+		bd_abort_claiming(bdev, claimed_bdev, loop_set_fd);
 out_putf:
 	fput(file);
 out:

drivers/block/nbd.c

@@ -1231,7 +1231,7 @@ static void nbd_clear_sock_ioctl(struct nbd_device *nbd,
 				 struct block_device *bdev)
 {
 	sock_shutdown(nbd);
-	kill_bdev(bdev);
+	__invalidate_device(bdev, true);
 	nbd_bdev_reset(bdev);
 	if (test_and_clear_bit(NBD_HAS_CONFIG_REF,
 			       &nbd->config->runtime_flags))

drivers/s390/block/dasd_alias.c

@@ -383,6 +383,20 @@ suborder_not_supported(struct dasd_ccw_req *cqr)
 	char msg_format;
 	char msg_no;
 
+	/*
+	 * intrc values ENODEV, ENOLINK and EPERM
+	 * will be optained from sleep_on to indicate that no
+	 * IO operation can be started
+	 */
+	if (cqr->intrc == -ENODEV)
+		return 1;
+
+	if (cqr->intrc == -ENOLINK)
+		return 1;
+
+	if (cqr->intrc == -EPERM)
+		return 1;
+
 	sense = dasd_get_sense(&cqr->irb);
 	if (!sense)
 		return 0;
@@ -447,12 +461,8 @@ static int read_unit_address_configuration(struct dasd_device *device,
 	lcu->flags &= ~NEED_UAC_UPDATE;
 	spin_unlock_irqrestore(&lcu->lock, flags);
 
-	do {
+	rc = dasd_sleep_on(cqr);
-		rc = dasd_sleep_on(cqr);
+	if (rc && !suborder_not_supported(cqr)) {
-		if (rc && suborder_not_supported(cqr))
-			return -EOPNOTSUPP;
-	} while (rc && (cqr->retries > 0));
-	if (rc) {
 		spin_lock_irqsave(&lcu->lock, flags);
 		lcu->flags |= NEED_UAC_UPDATE;
 		spin_unlock_irqrestore(&lcu->lock, flags);

fs/block_dev.c

@@ -439,6 +439,7 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages)
 					ret = -EAGAIN;
 				goto error;
 			}
+			ret = dio->size;
 
 			if (polled)
 				WRITE_ONCE(iocb->ki_cookie, qc);
@@ -465,7 +466,7 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages)
 				ret = -EAGAIN;
 			goto error;
 		}
-		ret += bio->bi_iter.bi_size;
+		ret = dio->size;
 
 		bio = bio_alloc(gfp, nr_pages);
 		if (!bio) {
@@ -1181,8 +1182,7 @@ static struct gendisk *bdev_get_gendisk(struct block_device *bdev, int *partno)
  * Pointer to the block device containing @bdev on success, ERR_PTR()
  * value on failure.
  */
-static struct block_device *bd_start_claiming(struct block_device *bdev,
+struct block_device *bd_start_claiming(struct block_device *bdev, void *holder)
-					      void *holder)
 {
 	struct gendisk *disk;
 	struct block_device *whole;
@@ -1229,6 +1229,62 @@ static struct block_device *bd_start_claiming(struct block_device *bdev,
 		return ERR_PTR(err);
 	}
 }
+EXPORT_SYMBOL(bd_start_claiming);
+
+static void bd_clear_claiming(struct block_device *whole, void *holder)
+{
+	lockdep_assert_held(&bdev_lock);
+	/* tell others that we're done */
+	BUG_ON(whole->bd_claiming != holder);
+	whole->bd_claiming = NULL;
+	wake_up_bit(&whole->bd_claiming, 0);
+}
+
+/**
+ * bd_finish_claiming - finish claiming of a block device
+ * @bdev: block device of interest
+ * @whole: whole block device (returned from bd_start_claiming())
+ * @holder: holder that has claimed @bdev
+ *
+ * Finish exclusive open of a block device. Mark the device as exlusively
+ * open by the holder and wake up all waiters for exclusive open to finish.
+ */
+void bd_finish_claiming(struct block_device *bdev, struct block_device *whole,
+			void *holder)
+{
+	spin_lock(&bdev_lock);
+	BUG_ON(!bd_may_claim(bdev, whole, holder));
+	/*
+	 * Note that for a whole device bd_holders will be incremented twice,
+	 * and bd_holder will be set to bd_may_claim before being set to holder
+	 */
+	whole->bd_holders++;
+	whole->bd_holder = bd_may_claim;
+	bdev->bd_holders++;
+	bdev->bd_holder = holder;
+	bd_clear_claiming(whole, holder);
+	spin_unlock(&bdev_lock);
+}
+EXPORT_SYMBOL(bd_finish_claiming);
+
+/**
+ * bd_abort_claiming - abort claiming of a block device
+ * @bdev: block device of interest
+ * @whole: whole block device (returned from bd_start_claiming())
+ * @holder: holder that has claimed @bdev
+ *
+ * Abort claiming of a block device when the exclusive open failed. This can be
+ * also used when exclusive open is not actually desired and we just needed
+ * to block other exclusive openers for a while.
+ */
+void bd_abort_claiming(struct block_device *bdev, struct block_device *whole,
+		       void *holder)
+{
+	spin_lock(&bdev_lock);
+	bd_clear_claiming(whole, holder);
+	spin_unlock(&bdev_lock);
+}
+EXPORT_SYMBOL(bd_abort_claiming);
 
 #ifdef CONFIG_SYSFS
 struct bd_holder_disk {
@@ -1698,29 +1754,7 @@ int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder)
 
 		/* finish claiming */
 		mutex_lock(&bdev->bd_mutex);
-		spin_lock(&bdev_lock);
+		bd_finish_claiming(bdev, whole, holder);
-
-		if (!res) {
-			BUG_ON(!bd_may_claim(bdev, whole, holder));
-			/*
-			 * Note that for a whole device bd_holders
-			 * will be incremented twice, and bd_holder
-			 * will be set to bd_may_claim before being
-			 * set to holder
-			 */
-			whole->bd_holders++;
-			whole->bd_holder = bd_may_claim;
-			bdev->bd_holders++;
-			bdev->bd_holder = holder;
-		}
-
-		/* tell others that we're done */
-		BUG_ON(whole->bd_claiming != holder);
-		whole->bd_claiming = NULL;
-		wake_up_bit(&whole->bd_claiming, 0);
-
-		spin_unlock(&bdev_lock);
-
 		/*
 		 * Block event polling for write claims if requested.  Any
 		 * write holder makes the write_holder state stick until

fs/io_uring.c

@@ -1838,6 +1838,7 @@ restart:
 	do {
 		struct sqe_submit *s = &req->submit;
 		const struct io_uring_sqe *sqe = s->sqe;
+		unsigned int flags = req->flags;
 
 		/* Ensure we clear previously set non-block flag */
 		req->rw.ki_flags &= ~IOCB_NOWAIT;
@@ -1883,7 +1884,7 @@ restart:
 		kfree(sqe);
 
 		/* req from defer and link list needn't decrease async cnt */
-		if (req->flags & (REQ_F_IO_DRAINED | REQ_F_LINK_DONE))
+		if (flags & (REQ_F_IO_DRAINED | REQ_F_LINK_DONE))
 			goto out;
 
 		if (!async_list)

include/linux/fs.h

@@ -2598,6 +2598,12 @@ extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
 					       void *holder);
 extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode,
 					      void *holder);
+extern struct block_device *bd_start_claiming(struct block_device *bdev,
+					      void *holder);
+extern void bd_finish_claiming(struct block_device *bdev,
+			       struct block_device *whole, void *holder);
+extern void bd_abort_claiming(struct block_device *bdev,
+			      struct block_device *whole, void *holder);
 extern void blkdev_put(struct block_device *bdev, fmode_t mode);
 extern int __blkdev_reread_part(struct block_device *bdev);
 extern int blkdev_reread_part(struct block_device *bdev);