11 files changed, 199 insertions, 96 deletions

diff --git a/block/blk-ioc.c b/block/blk-ioc.c
index 8b782a63c297..fb95dd2f889a 100644
--- a/block/blk-ioc.c
+++ b/block/blk-ioc.c
@@ -36,11 +36,23 @@ static void icq_free_icq_rcu(struct rcu_head *head)
         kmem_cache_free(icq->__rcu_icq_cache, icq);
 }
 
-/*
- * Exit and free an icq.  Called with both ioc and q locked.
- */
+/* Exit an icq. Called with both ioc and q locked. */
 static void ioc_exit_icq(struct io_cq *icq)
 {
+        struct elevator_type *et = icq->q->elevator->type;
+
+        if (icq->flags & ICQ_EXITED)
+                return;
+
+        if (et->ops.elevator_exit_icq_fn)
+                et->ops.elevator_exit_icq_fn(icq);
+
+        icq->flags |= ICQ_EXITED;
+}
+
+/* Release an icq.  Called with both ioc and q locked. */
+static void ioc_destroy_icq(struct io_cq *icq)
+{
         struct io_context *ioc = icq->ioc;
         struct request_queue *q = icq->q;
         struct elevator_type *et = q->elevator->type;
@@ -60,8 +72,7 @@ static void ioc_exit_icq(struct io_cq *icq)
         if (rcu_dereference_raw(ioc->icq_hint) == icq)
                 rcu_assign_pointer(ioc->icq_hint, NULL);
 
-        if (et->ops.elevator_exit_icq_fn)
-                et->ops.elevator_exit_icq_fn(icq);
+        ioc_exit_icq(icq);
 
         /*
          * @icq->q might have gone away by the time RCU callback runs
@@ -79,7 +90,6 @@ static void ioc_release_fn(struct work_struct *work)
 {
         struct io_context *ioc = container_of(work, struct io_context,
                                               release_work);
-        struct request_queue *last_q = NULL;
         unsigned long flags;
 
         /*
@@ -93,44 +103,19 @@ static void ioc_release_fn(struct work_struct *work)
         while (!hlist_empty(&ioc->icq_list)) {
                 struct io_cq *icq = hlist_entry(ioc->icq_list.first,
                                                 struct io_cq, ioc_node);
-                struct request_queue *this_q = icq->q;
-
-                if (this_q != last_q) {
-                        /*
-                         * Need to switch to @this_q.  Once we release
-                         * @ioc->lock, it can go away along with @cic.
-                         * Hold on to it.
-                         */
-                        __blk_get_queue(this_q);
-
-                        /*
-                         * blk_put_queue() might sleep thanks to kobject
-                         * idiocy.  Always release both locks, put and
-                         * restart.
-                         */
-                        if (last_q) {
-                                spin_unlock(last_q->queue_lock);
-                                spin_unlock_irqrestore(&ioc->lock, flags);
-                                blk_put_queue(last_q);
-                        } else {
-                                spin_unlock_irqrestore(&ioc->lock, flags);
-                        }
-
-                        last_q = this_q;
-                        spin_lock_irqsave(this_q->queue_lock, flags);
-                        spin_lock_nested(&ioc->lock, 1);
-                        continue;
+                struct request_queue *q = icq->q;
+
+                if (spin_trylock(q->queue_lock)) {
+                        ioc_destroy_icq(icq);
+                        spin_unlock(q->queue_lock);
+                } else {
+                        spin_unlock_irqrestore(&ioc->lock, flags);
+                        cpu_relax();
+                        spin_lock_irqsave_nested(&ioc->lock, flags, 1);
                 }
-                ioc_exit_icq(icq);
         }
 
-        if (last_q) {
-                spin_unlock(last_q->queue_lock);
-                spin_unlock_irqrestore(&ioc->lock, flags);
-                blk_put_queue(last_q);
-        } else {
-                spin_unlock_irqrestore(&ioc->lock, flags);
-        }
+        spin_unlock_irqrestore(&ioc->lock, flags);
 
         kmem_cache_free(iocontext_cachep, ioc);
 }
@@ -145,6 +130,7 @@ static void ioc_release_fn(struct work_struct *work)
 void put_io_context(struct io_context *ioc)
 {
         unsigned long flags;
+        bool free_ioc = false;
 
         if (ioc == NULL)
                 return;
@@ -159,8 +145,13 @@ void put_io_context(struct io_context *ioc)
                 spin_lock_irqsave(&ioc->lock, flags);
                 if (!hlist_empty(&ioc->icq_list))
                         schedule_work(&ioc->release_work);
+                else
+                        free_ioc = true;
                 spin_unlock_irqrestore(&ioc->lock, flags);
         }
+
+        if (free_ioc)
+                kmem_cache_free(iocontext_cachep, ioc);
 }
 EXPORT_SYMBOL(put_io_context);
 
@@ -168,13 +159,41 @@ EXPORT_SYMBOL(put_io_context);
 void exit_io_context(struct task_struct *task)
 {
         struct io_context *ioc;
+        struct io_cq *icq;
+        struct hlist_node *n;
+        unsigned long flags;
 
         task_lock(task);
         ioc = task->io_context;
         task->io_context = NULL;
         task_unlock(task);
 
-        atomic_dec(&ioc->nr_tasks);
+        if (!atomic_dec_and_test(&ioc->nr_tasks)) {
+                put_io_context(ioc);
+                return;
+        }
+
+        /*
+         * Need ioc lock to walk icq_list and q lock to exit icq.  Perform
+         * reverse double locking.  Read comment in ioc_release_fn() for
+         * explanation on the nested locking annotation.
+         */
+retry:
+        spin_lock_irqsave_nested(&ioc->lock, flags, 1);
+        hlist_for_each_entry(icq, n, &ioc->icq_list, ioc_node) {
+                if (icq->flags & ICQ_EXITED)
+                        continue;
+                if (spin_trylock(icq->q->queue_lock)) {
+                        ioc_exit_icq(icq);
+                        spin_unlock(icq->q->queue_lock);
+                } else {
+                        spin_unlock_irqrestore(&ioc->lock, flags);
+                        cpu_relax();
+                        goto retry;
+                }
+        }
+        spin_unlock_irqrestore(&ioc->lock, flags);
+
         put_io_context(ioc);
 }
 
@@ -194,7 +213,7 @@ void ioc_clear_queue(struct request_queue *q)
                 struct io_context *ioc = icq->ioc;
 
                 spin_lock(&ioc->lock);
-                ioc_exit_icq(icq);
+                ioc_destroy_icq(icq);
                 spin_unlock(&ioc->lock);
         }
 }
@@ -363,13 +382,13 @@ struct io_cq *ioc_create_icq(struct request_queue *q, gfp_t gfp_mask)
         return icq;
 }
 
-void ioc_set_changed(struct io_context *ioc, int which)
+void ioc_set_icq_flags(struct io_context *ioc, unsigned int flags)
 {
         struct io_cq *icq;
         struct hlist_node *n;
 
         hlist_for_each_entry(icq, n, &ioc->icq_list, ioc_node)
-                set_bit(which, &icq->changed);
+                icq->flags |= flags;
 }
 
 /**
@@ -387,7 +406,7 @@ void ioc_ioprio_changed(struct io_context *ioc, int ioprio)
 
         spin_lock_irqsave(&ioc->lock, flags);
         ioc->ioprio = ioprio;
-        ioc_set_changed(ioc, ICQ_IOPRIO_CHANGED);
+        ioc_set_icq_flags(ioc, ICQ_IOPRIO_CHANGED);
         spin_unlock_irqrestore(&ioc->lock, flags);
 }
 
@@ -404,11 +423,33 @@ void ioc_cgroup_changed(struct io_context *ioc)
         unsigned long flags;
 
         spin_lock_irqsave(&ioc->lock, flags);
-        ioc_set_changed(ioc, ICQ_CGROUP_CHANGED);
+        ioc_set_icq_flags(ioc, ICQ_CGROUP_CHANGED);
         spin_unlock_irqrestore(&ioc->lock, flags);
 }
 EXPORT_SYMBOL(ioc_cgroup_changed);
 
+/**
+ * icq_get_changed - fetch and clear icq changed mask
+ * @icq: icq of interest
+ *
+ * Fetch and clear ICQ_*_CHANGED bits from @icq.  Grabs and releases
+ * @icq->ioc->lock.
+ */
+unsigned icq_get_changed(struct io_cq *icq)
+{
+        unsigned int changed = 0;
+        unsigned long flags;
+
+        if (unlikely(icq->flags & ICQ_CHANGED_MASK)) {
+                spin_lock_irqsave(&icq->ioc->lock, flags);
+                changed = icq->flags & ICQ_CHANGED_MASK;
+                icq->flags &= ~ICQ_CHANGED_MASK;
+                spin_unlock_irqrestore(&icq->ioc->lock, flags);
+        }
+        return changed;
+}
+EXPORT_SYMBOL(icq_get_changed);
+
 static int __init blk_ioc_init(void)
 {
         iocontext_cachep = kmem_cache_create("blkdev_ioc",
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index d0ba50533668..457295253566 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -3470,20 +3470,20 @@ cfq_set_request(struct request_queue *q, struct request *rq, gfp_t gfp_mask)
         const int rw = rq_data_dir(rq);
         const bool is_sync = rq_is_sync(rq);
         struct cfq_queue *cfqq;
+        unsigned int changed;
 
         might_sleep_if(gfp_mask & __GFP_WAIT);
 
         spin_lock_irq(q->queue_lock);
 
         /* handle changed notifications */
-        if (unlikely(cic->icq.changed)) {
-                if (test_and_clear_bit(ICQ_IOPRIO_CHANGED, &cic->icq.changed))
-                        changed_ioprio(cic);
+        changed = icq_get_changed(&cic->icq);
+        if (unlikely(changed & ICQ_IOPRIO_CHANGED))
+                changed_ioprio(cic);
 #ifdef CONFIG_CFQ_GROUP_IOSCHED
-                if (test_and_clear_bit(ICQ_CGROUP_CHANGED, &cic->icq.changed))
-                        changed_cgroup(cic);
+        if (unlikely(changed & ICQ_CGROUP_CHANGED))
+                changed_cgroup(cic);
 #endif
-        }
 
 new_queue:
         cfqq = cic_to_cfqq(cic, is_sync);
diff --git a/block/genhd.c b/block/genhd.c
index 23b4f7063322..df9816ede75b 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -35,6 +35,7 @@ static DEFINE_IDR(ext_devt_idr);
 
 static struct device_type disk_type;
 
+static void disk_alloc_events(struct gendisk *disk);
 static void disk_add_events(struct gendisk *disk);
 static void disk_del_events(struct gendisk *disk);
 static void disk_release_events(struct gendisk *disk);
@@ -601,6 +602,8 @@ void add_disk(struct gendisk *disk)
         disk->major = MAJOR(devt);
         disk->first_minor = MINOR(devt);
 
+        disk_alloc_events(disk);
+
         /* Register BDI before referencing it from bdev */
         bdi = &disk->queue->backing_dev_info;
         bdi_register_dev(bdi, disk_devt(disk));
@@ -1475,9 +1478,9 @@ static void __disk_unblock_events(struct gendisk *disk, bool check_now)
         intv = disk_events_poll_jiffies(disk);
         set_timer_slack(&ev->dwork.timer, intv / 4);
         if (check_now)
-                queue_delayed_work(system_nrt_wq, &ev->dwork, 0);
+                queue_delayed_work(system_nrt_freezable_wq, &ev->dwork, 0);
         else if (intv)
-                queue_delayed_work(system_nrt_wq, &ev->dwork, intv);
+                queue_delayed_work(system_nrt_freezable_wq, &ev->dwork, intv);
 out_unlock:
         spin_unlock_irqrestore(&ev->lock, flags);
 }
@@ -1521,7 +1524,7 @@ void disk_flush_events(struct gendisk *disk, unsigned int mask)
         ev->clearing |= mask;
         if (!ev->block) {
                 cancel_delayed_work(&ev->dwork);
-                queue_delayed_work(system_nrt_wq, &ev->dwork, 0);
+                queue_delayed_work(system_nrt_freezable_wq, &ev->dwork, 0);
         }
         spin_unlock_irq(&ev->lock);
 }
@@ -1558,7 +1561,7 @@ unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask)
 
         /* uncondtionally schedule event check and wait for it to finish */
         disk_block_events(disk);
-        queue_delayed_work(system_nrt_wq, &ev->dwork, 0);
+        queue_delayed_work(system_nrt_freezable_wq, &ev->dwork, 0);
         flush_delayed_work(&ev->dwork);
         __disk_unblock_events(disk, false);
 
@@ -1595,7 +1598,7 @@ static void disk_events_workfn(struct work_struct *work)
 
         intv = disk_events_poll_jiffies(disk);
         if (!ev->block && intv)
-                queue_delayed_work(system_nrt_wq, &ev->dwork, intv);
+                queue_delayed_work(system_nrt_freezable_wq, &ev->dwork, intv);
 
         spin_unlock_irq(&ev->lock);
 
@@ -1733,9 +1736,9 @@ module_param_cb(events_dfl_poll_msecs, &disk_events_dfl_poll_msecs_param_ops,
                 &disk_events_dfl_poll_msecs, 0644);
 
 /*
- * disk_{add|del|release}_events - initialize and destroy disk_events.
+ * disk_{alloc|add|del|release}_events - initialize and destroy disk_events.
  */
-static void disk_add_events(struct gendisk *disk)
+static void disk_alloc_events(struct gendisk *disk)
 {
         struct disk_events *ev;
 
@@ -1748,16 +1751,6 @@ static void disk_add_events(struct gendisk *disk)
                 return;
         }
 
-        if (sysfs_create_files(&disk_to_dev(disk)->kobj,
-                               disk_events_attrs) < 0) {
-                pr_warn("%s: failed to create sysfs files for events\n",
-                        disk->disk_name);
-                kfree(ev);
-                return;
-        }
-
-        disk->ev = ev;
-
         INIT_LIST_HEAD(&ev->node);
         ev->disk = disk;
         spin_lock_init(&ev->lock);
@@ -1766,8 +1759,21 @@ static void disk_add_events(struct gendisk *disk)
         ev->poll_msecs = -1;
         INIT_DELAYED_WORK(&ev->dwork, disk_events_workfn);
 
+        disk->ev = ev;
+}
+
+static void disk_add_events(struct gendisk *disk)
+{
+        if (!disk->ev)
+                return;
+
+        /* FIXME: error handling */
+        if (sysfs_create_files(&disk_to_dev(disk)->kobj, disk_events_attrs) < 0)
+                pr_warn("%s: failed to create sysfs files for events\n",
+                        disk->disk_name);
+
         mutex_lock(&disk_events_mutex);
-        list_add_tail(&ev->node, &disk_events);
+        list_add_tail(&disk->ev->node, &disk_events);
         mutex_unlock(&disk_events_mutex);
 
         /*
diff --git a/block/partition-generic.c b/block/partition-generic.c
index d06ec1c829c2..6df5d6928a44 100644
--- a/block/partition-generic.c
+++ b/block/partition-generic.c
@@ -389,17 +389,11 @@ static bool disk_unlock_native_capacity(struct gendisk *disk)
         }
 }
 
-int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
+static int drop_partitions(struct gendisk *disk, struct block_device *bdev)
 {
-        struct parsed_partitions *state = NULL;
         struct disk_part_iter piter;
         struct hd_struct *part;
-        int p, highest, res;
-rescan:
-        if (state && !IS_ERR(state)) {
-                kfree(state);
-                state = NULL;
-        }
+        int res;
 
         if (bdev->bd_part_count)
                 return -EBUSY;
@@ -412,6 +406,24 @@ rescan:
                 delete_partition(disk, part->partno);
         disk_part_iter_exit(&piter);
 
+        return 0;
+}
+
+int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
+{
+        struct parsed_partitions *state = NULL;
+        struct hd_struct *part;
+        int p, highest, res;
+rescan:
+        if (state && !IS_ERR(state)) {
+                kfree(state);
+                state = NULL;
+        }
+
+        res = drop_partitions(disk, bdev);
+        if (res)
+                return res;
+
         if (disk->fops->revalidate_disk)
                 disk->fops->revalidate_disk(disk);
         check_disk_size_change(disk, bdev);
@@ -515,6 +527,26 @@ rescan:
         return 0;
 }
 
+int invalidate_partitions(struct gendisk *disk, struct block_device *bdev)
+{
+        int res;
+
+        if (!bdev->bd_invalidated)
+                return 0;
+
+        res = drop_partitions(disk, bdev);
+        if (res)
+                return res;
+
+        set_capacity(disk, 0);
+        check_disk_size_change(disk, bdev);
+        bdev->bd_invalidated = 0;
+        /* tell userspace that the media / partition table may have changed */
+        kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
+
+        return 0;
+}
+
 unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
 {
         struct address_space *mapping = bdev->bd_inode->i_mapping;
diff --git a/drivers/block/DAC960.c b/drivers/block/DAC960.c
index e086fbbbe853..8db9089127c5 100644
--- a/drivers/block/DAC960.c
+++ b/drivers/block/DAC960.c
@@ -1177,7 +1177,8 @@ static bool DAC960_V1_EnableMemoryMailboxInterface(DAC960_Controller_T
   int TimeoutCounter;
   int i;
 
-  
+  memset(&CommandMailbox, 0, sizeof(DAC960_V1_CommandMailbox_T));
+
   if (pci_set_dma_mask(Controller->PCIDevice, DMA_BIT_MASK(32)))
         return DAC960_Failure(Controller, "DMA mask out of range");
   Controller->BounceBufferLimit = DMA_BIT_MASK(32);
@@ -4627,7 +4628,8 @@ static void DAC960_V2_ProcessCompletedCommand(DAC960_Command_T *Command)
   DAC960_Controller_T *Controller = Command->Controller;
   DAC960_CommandType_T CommandType = Command->CommandType;
   DAC960_V2_CommandMailbox_T *CommandMailbox = &Command->V2.CommandMailbox;
-  DAC960_V2_IOCTL_Opcode_T CommandOpcode = CommandMailbox->Common.IOCTL_Opcode;
+  DAC960_V2_IOCTL_Opcode_T IOCTLOpcode = CommandMailbox->Common.IOCTL_Opcode;
+  DAC960_V2_CommandOpcode_T CommandOpcode = CommandMailbox->SCSI_10.CommandOpcode;
   DAC960_V2_CommandStatus_T CommandStatus = Command->V2.CommandStatus;
 
   if (CommandType == DAC960_ReadCommand ||
@@ -4699,7 +4701,7 @@ static void DAC960_V2_ProcessCompletedCommand(DAC960_Command_T *Command)
     {
       if (Controller->ShutdownMonitoringTimer)
               return;
-      if (CommandOpcode == DAC960_V2_GetControllerInfo)
+      if (IOCTLOpcode == DAC960_V2_GetControllerInfo)
         {
           DAC960_V2_ControllerInfo_T *NewControllerInfo =
             Controller->V2.NewControllerInformation;
@@ -4719,14 +4721,14 @@ static void DAC960_V2_ProcessCompletedCommand(DAC960_Command_T *Command)
           memcpy(ControllerInfo, NewControllerInfo,
                  sizeof(DAC960_V2_ControllerInfo_T));
         }
-      else if (CommandOpcode == DAC960_V2_GetEvent)
+      else if (IOCTLOpcode == DAC960_V2_GetEvent)
         {
           if (CommandStatus == DAC960_V2_NormalCompletion) {
             DAC960_V2_ReportEvent(Controller, Controller->V2.Event);
           }
           Controller->V2.NextEventSequenceNumber++;
         }
-      else if (CommandOpcode == DAC960_V2_GetPhysicalDeviceInfoValid &&
+      else if (IOCTLOpcode == DAC960_V2_GetPhysicalDeviceInfoValid &&
                CommandStatus == DAC960_V2_NormalCompletion)
         {
           DAC960_V2_PhysicalDeviceInfo_T *NewPhysicalDeviceInfo =
@@ -4915,7 +4917,7 @@ static void DAC960_V2_ProcessCompletedCommand(DAC960_Command_T *Command)
           NewPhysicalDeviceInfo->LogicalUnit++;
           Controller->V2.PhysicalDeviceIndex++;
         }
-      else if (CommandOpcode == DAC960_V2_GetPhysicalDeviceInfoValid)
+      else if (IOCTLOpcode == DAC960_V2_GetPhysicalDeviceInfoValid)
         {
           unsigned int DeviceIndex;
           for (DeviceIndex = Controller->V2.PhysicalDeviceIndex;
@@ -4938,7 +4940,7 @@ static void DAC960_V2_ProcessCompletedCommand(DAC960_Command_T *Command)
             }
           Controller->V2.NeedPhysicalDeviceInformation = false;
         }
-      else if (CommandOpcode == DAC960_V2_GetLogicalDeviceInfoValid &&
+      else if (IOCTLOpcode == DAC960_V2_GetLogicalDeviceInfoValid &&
                CommandStatus == DAC960_V2_NormalCompletion)
         {
           DAC960_V2_LogicalDeviceInfo_T *NewLogicalDeviceInfo =
@@ -5065,7 +5067,7 @@ static void DAC960_V2_ProcessCompletedCommand(DAC960_Command_T *Command)
                          [LogicalDeviceNumber] = true;
           NewLogicalDeviceInfo->LogicalDeviceNumber++;
         }
-      else if (CommandOpcode == DAC960_V2_GetLogicalDeviceInfoValid)
+      else if (IOCTLOpcode == DAC960_V2_GetLogicalDeviceInfoValid)
         {
           int LogicalDriveNumber;
           for (LogicalDriveNumber = 0;
diff --git a/drivers/block/sx8.c b/drivers/block/sx8.c
index e7472f567c9d..3fb6ab4c8b4e 100644
--- a/drivers/block/sx8.c
+++ b/drivers/block/sx8.c
@@ -1120,7 +1120,7 @@ static inline void carm_handle_resp(struct carm_host *host,
                         break;
                 case MISC_GET_FW_VER: {
                         struct carm_fw_ver *ver = (struct carm_fw_ver *)
-                                mem + sizeof(struct carm_msg_get_fw_ver);
+                                (mem + sizeof(struct carm_msg_get_fw_ver));
                         if (!error) {
                                 host->fw_ver = le32_to_cpu(ver->version);
                                 host->flags |= (ver->features & FL_FW_VER_MASK);
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 0e575d1304b4..5e9f198f7712 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1183,8 +1183,12 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
                          * The latter is necessary to prevent ghost
                          * partitions on a removed medium.
                          */
-                        if (bdev->bd_invalidated && (!ret || ret == -ENOMEDIUM))
-                                rescan_partitions(disk, bdev);
+                        if (bdev->bd_invalidated) {
+                                if (!ret)
+                                        rescan_partitions(disk, bdev);
+                                else if (ret == -ENOMEDIUM)
+                                        invalidate_partitions(disk, bdev);
+                        }
                         if (ret)
                                 goto out_clear;
                 } else {
@@ -1214,8 +1218,12 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
                         if (bdev->bd_disk->fops->open)
                                 ret = bdev->bd_disk->fops->open(bdev, mode);
                         /* the same as first opener case, read comment there */
-                        if (bdev->bd_invalidated && (!ret || ret == -ENOMEDIUM))
-                                rescan_partitions(bdev->bd_disk, bdev);
+                        if (bdev->bd_invalidated) {
+                                if (!ret)
+                                        rescan_partitions(bdev->bd_disk, bdev);
+                                else if (ret == -ENOMEDIUM)
+                                        invalidate_partitions(bdev->bd_disk, bdev);
+                        }
                         if (ret)
                                 goto out_unlock_bdev;
                 }
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index fe23ee768589..e61d3192448e 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -596,6 +596,7 @@ extern char *disk_name (struct gendisk *hd, int partno, char *buf);
 
 extern int disk_expand_part_tbl(struct gendisk *disk, int target);
 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
+extern int invalidate_partitions(struct gendisk *disk, struct block_device *bdev);
 extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
                                                      int partno, sector_t start,
                                                      sector_t len, int flags,
diff --git a/include/linux/iocontext.h b/include/linux/iocontext.h
index 119773eebe31..1a3018063034 100644
--- a/include/linux/iocontext.h
+++ b/include/linux/iocontext.h
@@ -6,8 +6,11 @@
 #include <linux/workqueue.h>
 
 enum {
-        ICQ_IOPRIO_CHANGED,
-        ICQ_CGROUP_CHANGED,
+        ICQ_IOPRIO_CHANGED      = 1 << 0,
+        ICQ_CGROUP_CHANGED      = 1 << 1,
+        ICQ_EXITED              = 1 << 2,
+
+        ICQ_CHANGED_MASK        = ICQ_IOPRIO_CHANGED | ICQ_CGROUP_CHANGED,
 };
 
 /*
@@ -88,7 +91,7 @@ struct io_cq {
                 struct rcu_head         __rcu_head;
         };
 
-        unsigned long           changed;
+        unsigned int            flags;
 };
 
 /*
@@ -139,6 +142,7 @@ struct io_context *get_task_io_context(struct task_struct *task,
                                        gfp_t gfp_flags, int node);
 void ioc_ioprio_changed(struct io_context *ioc, int ioprio);
 void ioc_cgroup_changed(struct io_context *ioc);
+unsigned int icq_get_changed(struct io_cq *icq);
 #else
 struct io_context;
 static inline void put_io_context(struct io_context *ioc) { }
diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index eb8b9f15f2e0..af155450cabb 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -289,12 +289,16 @@ enum {
  *
  * system_freezable_wq is equivalent to system_wq except that it's
  * freezable.
+ *
+ * system_nrt_freezable_wq is equivalent to system_nrt_wq except that
+ * it's freezable.
  */
 extern struct workqueue_struct *system_wq;
 extern struct workqueue_struct *system_long_wq;
 extern struct workqueue_struct *system_nrt_wq;
 extern struct workqueue_struct *system_unbound_wq;
 extern struct workqueue_struct *system_freezable_wq;
+extern struct workqueue_struct *system_nrt_freezable_wq;
 
 extern struct workqueue_struct *
 __alloc_workqueue_key(const char *fmt, unsigned int flags, int max_active,
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index bec7b5b53e03..f2c5638bb5ab 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -253,11 +253,13 @@ struct workqueue_struct *system_long_wq __read_mostly;
 struct workqueue_struct *system_nrt_wq __read_mostly;
 struct workqueue_struct *system_unbound_wq __read_mostly;
 struct workqueue_struct *system_freezable_wq __read_mostly;
+struct workqueue_struct *system_nrt_freezable_wq __read_mostly;
 EXPORT_SYMBOL_GPL(system_wq);
 EXPORT_SYMBOL_GPL(system_long_wq);
 EXPORT_SYMBOL_GPL(system_nrt_wq);
 EXPORT_SYMBOL_GPL(system_unbound_wq);
 EXPORT_SYMBOL_GPL(system_freezable_wq);
+EXPORT_SYMBOL_GPL(system_nrt_freezable_wq);
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/workqueue.h>
@@ -3833,8 +3835,11 @@ static int __init init_workqueues(void)
                                             WQ_UNBOUND_MAX_ACTIVE);
         system_freezable_wq = alloc_workqueue("events_freezable",
                                               WQ_FREEZABLE, 0);
+        system_nrt_freezable_wq = alloc_workqueue("events_nrt_freezable",
+                        WQ_NON_REENTRANT | WQ_FREEZABLE, 0);
         BUG_ON(!system_wq || !system_long_wq || !system_nrt_wq ||
-               !system_unbound_wq || !system_freezable_wq);
+               !system_unbound_wq || !system_freezable_wq ||
+                !system_nrt_freezable_wq);
         return 0;
 }
 early_initcall(init_workqueues);