[4.2.y-ckt stable] Patch "mtip32xx: Handle safe removal during IO" has been added to the 4.2.y-ckt tree

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    mtip32xx: Handle safe removal during IO

to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-4.2.y-queue

This patch is scheduled to be released in version 4.2.8-ckt7.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 4.2.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

---8<------------------------------------------------------------

>From ac82fa6d67dd1d89d05369b74c6d02b35b7cfb6d Mon Sep 17 00:00:00 2001
From: Asai Thambi SP <asamymuthupa at micron.com>
Date: Wed, 24 Feb 2016 21:18:10 -0800
Subject: mtip32xx: Handle safe removal during IO

commit 51c6570eb922146470c2fe660c34585414679bd6 upstream.

Flush inflight IOs using fsync_bdev() when the device is safely
removed. Also, block further IOs in device open function.

Signed-off-by: Selvan Mani <smani at micron.com>
Signed-off-by: Rajesh Kumar Sambandam <rsambandam at micron.com>
Signed-off-by: Asai Thambi S P <asamymuthupa at micron.com>
Signed-off-by: Jens Axboe <axboe at fb.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/block/mtip32xx/mtip32xx.c | 34 ++++++++++++++++++++++++++++++++--
 drivers/block/mtip32xx/mtip32xx.h |  1 +
 2 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index 35012a6..dfd1906 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -3602,6 +3602,28 @@ static int mtip_block_getgeo(struct block_device *dev,
 	return 0;
 }

+static int mtip_block_open(struct block_device *dev, fmode_t mode)
+{
+	struct driver_data *dd;
+
+	if (dev && dev->bd_disk) {
+		dd = (struct driver_data *) dev->bd_disk->private_data;
+
+		if (dd) {
+			if (test_bit(MTIP_DDF_REMOVAL_BIT,
+							&dd->dd_flag)) {
+				return -ENODEV;
+			}
+			return 0;
+		}
+	}
+	return -ENODEV;
+}
+
+void mtip_block_release(struct gendisk *disk, fmode_t mode)
+{
+}
+
 /*
  * Block device operation function.
  *
@@ -3609,6 +3631,8 @@ static int mtip_block_getgeo(struct block_device *dev,
  * layer.
  */
 static const struct block_device_operations mtip_block_ops = {
+	.open		= mtip_block_open,
+	.release	= mtip_block_release,
 	.ioctl		= mtip_block_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl	= mtip_block_compat_ioctl,
@@ -4436,7 +4460,7 @@ static void mtip_pci_remove(struct pci_dev *pdev)
 	struct driver_data *dd = pci_get_drvdata(pdev);
 	unsigned long flags, to;

-	set_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag);
+	set_bit(MTIP_DDF_REMOVAL_BIT, &dd->dd_flag);

 	spin_lock_irqsave(&dev_lock, flags);
 	list_del_init(&dd->online_list);
@@ -4453,12 +4477,18 @@ static void mtip_pci_remove(struct pci_dev *pdev)
 	} while (atomic_read(&dd->irq_workers_active) != 0 &&
 		time_before(jiffies, to));

+	fsync_bdev(dd->bdev);
+
 	if (atomic_read(&dd->irq_workers_active) != 0) {
 		dev_warn(&dd->pdev->dev,
 			"Completion workers still active!\n");
 	}

-	blk_mq_stop_hw_queues(dd->queue);
+	if (dd->sr)
+		blk_mq_stop_hw_queues(dd->queue);
+
+	set_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag);
+
 	/* Clean up the block layer. */
 	mtip_block_remove(dd);

diff --git a/drivers/block/mtip32xx/mtip32xx.h b/drivers/block/mtip32xx/mtip32xx.h
index 8635239..50af742 100644
--- a/drivers/block/mtip32xx/mtip32xx.h
+++ b/drivers/block/mtip32xx/mtip32xx.h
@@ -158,6 +158,7 @@ enum {
 	MTIP_DDF_RESUME_BIT         = 6,
 	MTIP_DDF_INIT_DONE_BIT      = 7,
 	MTIP_DDF_REBUILD_FAILED_BIT = 8,
+	MTIP_DDF_REMOVAL_BIT	    = 9,

 	MTIP_DDF_STOP_IO      = ((1 << MTIP_DDF_REMOVE_PENDING_BIT) |
 				(1 << MTIP_DDF_SEC_LOCK_BIT) |
--
2.7.4