Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block

* 'for-linus' of git://git.kernel.dk/linux-2.6-block: (37 commits)
  splice: fix generic_file_splice_read() race with page invalidation
  ramfs: enable splice write
  drivers/block/pktcdvd.c: avoid useless memset
  cdrom: revert commit 22a9189 (cdrom: use kmalloced buffers instead of buffers on stack)
  scsi: sr avoids useless buffer allocation
  block: blk_rq_map_kern uses the bounce buffers for stack buffers
  block: add blk_queue_update_dma_pad
  DAC960: push down BKL
  pktcdvd: push BKL down into driver
  paride: push ioctl down into driver
  block: use get_unaligned_* helpers
  block: extend queue_flag bitops
  block: request_module(): use format string
  Add bvec_merge_data to handle stacked devices and ->merge_bvec()
  block: integrity flags can't use bit ops on unsigned short
  cmdfilter: extend default read filter
  sg: fix odd style (extra parenthesis) introduced by cmd filter patch
  block: add bounce support to blk_rq_map_user_iov
  cfq-iosched: get rid of enable_idle being unused warning
  allow userspace to modify scsi command filter on per device basis
  ...

5 files changed, 187 insertions, 86 deletions

diff --git a/drivers/block/DAC960.c b/drivers/block/DAC960.c
index cd03473..a002a38 100644
--- a/drivers/block/DAC960.c
+++ b/drivers/block/DAC960.c
@@ -6628,15 +6628,18 @@ static void DAC960_DestroyProcEntries(DAC960_Controller_T *Controller)
  * DAC960_gam_ioctl is the ioctl function for performing RAID operations.
 */
 
-static int DAC960_gam_ioctl(struct inode *inode, struct file *file,
-			    unsigned int Request, unsigned long Argument)
+static long DAC960_gam_ioctl(struct file *file, unsigned int Request,
+						unsigned long Argument)
 {
-  int ErrorCode = 0;
+  long ErrorCode = 0;
   if (!capable(CAP_SYS_ADMIN)) return -EACCES;
+
+  lock_kernel();
   switch (Request)
     {
     case DAC960_IOCTL_GET_CONTROLLER_COUNT:
-      return DAC960_ControllerCount;
+      ErrorCode = DAC960_ControllerCount;
+      break;
     case DAC960_IOCTL_GET_CONTROLLER_INFO:
       {
 	DAC960_ControllerInfo_T __user *UserSpaceControllerInfo =
@@ -6644,15 +6647,20 @@ static int DAC960_gam_ioctl(struct inode *inode, struct file *file,
 	DAC960_ControllerInfo_T ControllerInfo;
 	DAC960_Controller_T *Controller;
 	int ControllerNumber;
-	if (UserSpaceControllerInfo == NULL) return -EINVAL;
-	ErrorCode = get_user(ControllerNumber,
+	if (UserSpaceControllerInfo == NULL)
+		ErrorCode = -EINVAL;
+	else ErrorCode = get_user(ControllerNumber,
 			     &UserSpaceControllerInfo->ControllerNumber);
-	if (ErrorCode != 0) return ErrorCode;
+	if (ErrorCode != 0)
+		break;;
+	ErrorCode = -ENXIO;
 	if (ControllerNumber < 0 ||
-	    ControllerNumber > DAC960_ControllerCount - 1)
-	  return -ENXIO;
+	    ControllerNumber > DAC960_ControllerCount - 1) {
+	  break;
+	}
 	Controller = DAC960_Controllers[ControllerNumber];
-	if (Controller == NULL) return -ENXIO;
+	if (Controller == NULL)
+		break;;
 	memset(&ControllerInfo, 0, sizeof(DAC960_ControllerInfo_T));
 	ControllerInfo.ControllerNumber = ControllerNumber;
 	ControllerInfo.FirmwareType = Controller->FirmwareType;
@@ -6665,8 +6673,9 @@ static int DAC960_gam_ioctl(struct inode *inode, struct file *file,
 	ControllerInfo.PCI_Address = Controller->PCI_Address;
 	strcpy(ControllerInfo.ModelName, Controller->ModelName);
 	strcpy(ControllerInfo.FirmwareVersion, Controller->FirmwareVersion);
-	return (copy_to_user(UserSpaceControllerInfo, &ControllerInfo,
+	ErrorCode = (copy_to_user(UserSpaceControllerInfo, &ControllerInfo,
 			     sizeof(DAC960_ControllerInfo_T)) ? -EFAULT : 0);
+	break;
       }
     case DAC960_IOCTL_V1_EXECUTE_COMMAND:
       {
@@ -6684,30 +6693,39 @@ static int DAC960_gam_ioctl(struct inode *inode, struct file *file,
 	int ControllerNumber, DataTransferLength;
 	unsigned char *DataTransferBuffer = NULL;
 	dma_addr_t DataTransferBufferDMA;
-	if (UserSpaceUserCommand == NULL) return -EINVAL;
+	if (UserSpaceUserCommand == NULL) {
+		ErrorCode = -EINVAL;
+		break;
+	}
 	if (copy_from_user(&UserCommand, UserSpaceUserCommand,
 				   sizeof(DAC960_V1_UserCommand_T))) {
 		ErrorCode = -EFAULT;
-		goto Failure1a;
+		break;
 	}
 	ControllerNumber = UserCommand.ControllerNumber;
+    	ErrorCode = -ENXIO;
 	if (ControllerNumber < 0 ||
 	    ControllerNumber > DAC960_ControllerCount - 1)
-	  return -ENXIO;
+	    	break;
 	Controller = DAC960_Controllers[ControllerNumber];
-	if (Controller == NULL) return -ENXIO;
-	if (Controller->FirmwareType != DAC960_V1_Controller) return -EINVAL;
+	if (Controller == NULL)
+		break;
+	ErrorCode = -EINVAL;
+	if (Controller->FirmwareType != DAC960_V1_Controller)
+		break;
 	CommandOpcode = UserCommand.CommandMailbox.Common.CommandOpcode;
 	DataTransferLength = UserCommand.DataTransferLength;
-	if (CommandOpcode & 0x80) return -EINVAL;
+	if (CommandOpcode & 0x80)
+		break;
 	if (CommandOpcode == DAC960_V1_DCDB)
 	  {
 	    if (copy_from_user(&DCDB, UserCommand.DCDB,
 			       sizeof(DAC960_V1_DCDB_T))) {
 		ErrorCode = -EFAULT;
-		goto Failure1a;
+		break;
 	    }
-	    if (DCDB.Channel >= DAC960_V1_MaxChannels) return -EINVAL;
+	    if (DCDB.Channel >= DAC960_V1_MaxChannels)
+	    		break;
 	    if (!((DataTransferLength == 0 &&
 		   DCDB.Direction
 		   == DAC960_V1_DCDB_NoDataTransfer) ||
@@ -6717,38 +6735,37 @@ static int DAC960_gam_ioctl(struct inode *inode, struct file *file,
 		  (DataTransferLength < 0 &&
 		   DCDB.Direction
 		   == DAC960_V1_DCDB_DataTransferSystemToDevice)))
-	      return -EINVAL;
+		   	break;
 	    if (((DCDB.TransferLengthHigh4 << 16) | DCDB.TransferLength)
 		!= abs(DataTransferLength))
-	      return -EINVAL;
+			break;
 	    DCDB_IOBUF = pci_alloc_consistent(Controller->PCIDevice,
 			sizeof(DAC960_V1_DCDB_T), &DCDB_IOBUFDMA);
-	    if (DCDB_IOBUF == NULL)
-			return -ENOMEM;
+	    if (DCDB_IOBUF == NULL) {
+	    		ErrorCode = -ENOMEM;
+			break;
+		}
 	  }
+	ErrorCode = -ENOMEM;
 	if (DataTransferLength > 0)
 	  {
 	    DataTransferBuffer = pci_alloc_consistent(Controller->PCIDevice,
 				DataTransferLength, &DataTransferBufferDMA);
-	    if (DataTransferBuffer == NULL) {
-		ErrorCode = -ENOMEM;
-		goto Failure1;
-	    }
+	    if (DataTransferBuffer == NULL)
+	    	break;
 	    memset(DataTransferBuffer, 0, DataTransferLength);
 	  }
 	else if (DataTransferLength < 0)
 	  {
 	    DataTransferBuffer = pci_alloc_consistent(Controller->PCIDevice,
 				-DataTransferLength, &DataTransferBufferDMA);
-	    if (DataTransferBuffer == NULL) {
-		ErrorCode = -ENOMEM;
-		goto Failure1;
-	    }
+	    if (DataTransferBuffer == NULL)
+	    	break;
 	    if (copy_from_user(DataTransferBuffer,
 			       UserCommand.DataTransferBuffer,
 			       -DataTransferLength)) {
 		ErrorCode = -EFAULT;
-		goto Failure1;
+		break;
 	    }
 	  }
 	if (CommandOpcode == DAC960_V1_DCDB)
@@ -6825,8 +6842,7 @@ static int DAC960_gam_ioctl(struct inode *inode, struct file *file,
 	if (DCDB_IOBUF != NULL)
 	  pci_free_consistent(Controller->PCIDevice, sizeof(DAC960_V1_DCDB_T),
 			DCDB_IOBUF, DCDB_IOBUFDMA);
-      Failure1a:
-	return ErrorCode;
+      	break;
       }
     case DAC960_IOCTL_V2_EXECUTE_COMMAND:
       {
@@ -6844,32 +6860,43 @@ static int DAC960_gam_ioctl(struct inode *inode, struct file *file,
 	dma_addr_t DataTransferBufferDMA;
 	unsigned char *RequestSenseBuffer = NULL;
 	dma_addr_t RequestSenseBufferDMA;
-	if (UserSpaceUserCommand == NULL) return -EINVAL;
+
+	ErrorCode = -EINVAL;
+	if (UserSpaceUserCommand == NULL)
+		break;
 	if (copy_from_user(&UserCommand, UserSpaceUserCommand,
 			   sizeof(DAC960_V2_UserCommand_T))) {
 		ErrorCode = -EFAULT;
-		goto Failure2a;
+		break;
 	}
+	ErrorCode = -ENXIO;
 	ControllerNumber = UserCommand.ControllerNumber;
 	if (ControllerNumber < 0 ||
 	    ControllerNumber > DAC960_ControllerCount - 1)
-	  return -ENXIO;
+	    	break;
 	Controller = DAC960_Controllers[ControllerNumber];
-	if (Controller == NULL) return -ENXIO;
-	if (Controller->FirmwareType != DAC960_V2_Controller) return -EINVAL;
+	if (Controller == NULL)
+		break;
+	if (Controller->FirmwareType != DAC960_V2_Controller){
+		ErrorCode = -EINVAL;
+		break;
+	}
 	DataTransferLength = UserCommand.DataTransferLength;
+    	ErrorCode = -ENOMEM;
 	if (DataTransferLength > 0)
 	  {
 	    DataTransferBuffer = pci_alloc_consistent(Controller->PCIDevice,
 				DataTransferLength, &DataTransferBufferDMA);
-	    if (DataTransferBuffer == NULL) return -ENOMEM;
+	    if (DataTransferBuffer == NULL)
+	    	break;
 	    memset(DataTransferBuffer, 0, DataTransferLength);
 	  }
 	else if (DataTransferLength < 0)
 	  {
 	    DataTransferBuffer = pci_alloc_consistent(Controller->PCIDevice,
 				-DataTransferLength, &DataTransferBufferDMA);
-	    if (DataTransferBuffer == NULL) return -ENOMEM;
+	    if (DataTransferBuffer == NULL)
+	    	break;
 	    if (copy_from_user(DataTransferBuffer,
 			       UserCommand.DataTransferBuffer,
 			       -DataTransferLength)) {
@@ -6979,8 +7006,7 @@ static int DAC960_gam_ioctl(struct inode *inode, struct file *file,
 	if (RequestSenseBuffer != NULL)
 	  pci_free_consistent(Controller->PCIDevice, RequestSenseLength,
 		RequestSenseBuffer, RequestSenseBufferDMA);
-      Failure2a:
-	return ErrorCode;
+        break;
       }
     case DAC960_IOCTL_V2_GET_HEALTH_STATUS:
       {
@@ -6990,21 +7016,33 @@ static int DAC960_gam_ioctl(struct inode *inode, struct file *file,
 	DAC960_V2_HealthStatusBuffer_T HealthStatusBuffer;
 	DAC960_Controller_T *Controller;
 	int ControllerNumber;
-	if (UserSpaceGetHealthStatus == NULL) return -EINVAL;
+	if (UserSpaceGetHealthStatus == NULL) {
+		ErrorCode = -EINVAL;
+		break;
+	}
 	if (copy_from_user(&GetHealthStatus, UserSpaceGetHealthStatus,
-			   sizeof(DAC960_V2_GetHealthStatus_T)))
-		return -EFAULT;
+			   sizeof(DAC960_V2_GetHealthStatus_T))) {
+		ErrorCode = -EFAULT;
+		break;
+	}
+	ErrorCode = -ENXIO;
 	ControllerNumber = GetHealthStatus.ControllerNumber;
 	if (ControllerNumber < 0 ||
 	    ControllerNumber > DAC960_ControllerCount - 1)
-	  return -ENXIO;
+		    break;
 	Controller = DAC960_Controllers[ControllerNumber];
-	if (Controller == NULL) return -ENXIO;
-	if (Controller->FirmwareType != DAC960_V2_Controller) return -EINVAL;
+	if (Controller == NULL)
+		break;
+	if (Controller->FirmwareType != DAC960_V2_Controller) {
+		ErrorCode = -EINVAL;
+		break;
+	}
 	if (copy_from_user(&HealthStatusBuffer,
 			   GetHealthStatus.HealthStatusBuffer,
-			   sizeof(DAC960_V2_HealthStatusBuffer_T)))
-		return -EFAULT;
+			   sizeof(DAC960_V2_HealthStatusBuffer_T))) {
+		ErrorCode = -EFAULT;
+		break;
+	}
 	while (Controller->V2.HealthStatusBuffer->StatusChangeCounter
 	       == HealthStatusBuffer.StatusChangeCounter &&
 	       Controller->V2.HealthStatusBuffer->NextEventSequenceNumber
@@ -7012,21 +7050,28 @@ static int DAC960_gam_ioctl(struct inode *inode, struct file *file,
 	  {
 	    interruptible_sleep_on_timeout(&Controller->HealthStatusWaitQueue,
 					   DAC960_MonitoringTimerInterval);
-	    if (signal_pending(current)) return -EINTR;
+	    if (signal_pending(current)) {
+	    	ErrorCode = -EINTR;
+	    	break;
+	    }
 	  }
 	if (copy_to_user(GetHealthStatus.HealthStatusBuffer,
 			 Controller->V2.HealthStatusBuffer,
 			 sizeof(DAC960_V2_HealthStatusBuffer_T)))
-		return -EFAULT;
-	return 0;
+		ErrorCode = -EFAULT;
+	else
+		ErrorCode =  0;
       }
+      default:
+	ErrorCode = -ENOTTY;
     }
-  return -EINVAL;
+  unlock_kernel();
+  return ErrorCode;
 }
 
 static const struct file_operations DAC960_gam_fops = {
 	.owner		= THIS_MODULE,
-	.ioctl		= DAC960_gam_ioctl
+	.unlocked_ioctl	= DAC960_gam_ioctl
 };
 
 static struct miscdevice DAC960_gam_dev = {
diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
index 41f818b..2f17462 100644
--- a/drivers/block/aoe/aoecmd.c
+++ b/drivers/block/aoe/aoecmd.c
@@ -1003,7 +1003,7 @@ aoecmd_cfg_rsp(struct sk_buff *skb)
 	 * Enough people have their dip switches set backwards to
 	 * warrant a loud message for this special case.
 	 */
-	aoemajor = be16_to_cpu(get_unaligned(&h->major));
+	aoemajor = get_unaligned_be16(&h->major);
 	if (aoemajor == 0xfff) {
 		printk(KERN_ERR "aoe: Warning: shelf address is all ones.  "
 			"Check shelf dip switches.\n");
diff --git a/drivers/block/paride/pt.c b/drivers/block/paride/pt.c
index 8b9549a..27455ee 100644
--- a/drivers/block/paride/pt.c
+++ b/drivers/block/paride/pt.c
@@ -146,6 +146,7 @@ static int (*drives[4])[6] = {&drive0, &drive1, &drive2, &drive3};
 #include <linux/mtio.h>
 #include <linux/device.h>
 #include <linux/sched.h>	/* current, TASK_*, schedule_timeout() */
+#include <linux/smp_lock.h>
 
 #include <asm/uaccess.h>
 
@@ -189,8 +190,7 @@ module_param_array(drive3, int, NULL, 0);
 #define ATAPI_LOG_SENSE		0x4d
 
 static int pt_open(struct inode *inode, struct file *file);
-static int pt_ioctl(struct inode *inode, struct file *file,
-		    unsigned int cmd, unsigned long arg);
+static long pt_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 static int pt_release(struct inode *inode, struct file *file);
 static ssize_t pt_read(struct file *filp, char __user *buf,
 		       size_t count, loff_t * ppos);
@@ -236,7 +236,7 @@ static const struct file_operations pt_fops = {
 	.owner = THIS_MODULE,
 	.read = pt_read,
 	.write = pt_write,
-	.ioctl = pt_ioctl,
+	.unlocked_ioctl = pt_ioctl,
 	.open = pt_open,
 	.release = pt_release,
 };
@@ -685,8 +685,7 @@ out:
 	return err;
 }
 
-static int pt_ioctl(struct inode *inode, struct file *file,
-	 unsigned int cmd, unsigned long arg)
+static long pt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
 	struct pt_unit *tape = file->private_data;
 	struct mtop __user *p = (void __user *)arg;
@@ -700,23 +699,26 @@ static int pt_ioctl(struct inode *inode, struct file *file,
 		switch (mtop.mt_op) {
 
 		case MTREW:
+			lock_kernel();
 			pt_rewind(tape);
+			unlock_kernel();
 			return 0;
 
 		case MTWEOF:
+			lock_kernel();
 			pt_write_fm(tape);
+			unlock_kernel();
 			return 0;
 
 		default:
-			printk("%s: Unimplemented mt_op %d\n", tape->name,
+			/* FIXME: rate limit ?? */
+			printk(KERN_DEBUG "%s: Unimplemented mt_op %d\n", tape->name,
 			       mtop.mt_op);
 			return -EINVAL;
 		}
 
 	default:
-		printk("%s: Unimplemented ioctl 0x%x\n", tape->name, cmd);
-		return -EINVAL;
-
+		return -ENOTTY;
 	}
 }
 
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 3ba1df9..45bee91 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -49,6 +49,7 @@
 #include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/kthread.h>
+#include <linux/smp_lock.h>
 #include <linux/errno.h>
 #include <linux/spinlock.h>
 #include <linux/file.h>
@@ -2079,7 +2080,6 @@ static noinline_for_stack int pkt_write_caching(struct pktcdvd_device *pd,
 	unsigned char buf[64];
 	int ret;
 
-	memset(buf, 0, sizeof(buf));
 	init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
 	cgc.sense = &sense;
 	cgc.buflen = pd->mode_offset + 12;
@@ -2126,7 +2126,6 @@ static noinline_for_stack int pkt_get_max_speed(struct pktcdvd_device *pd,
 	unsigned char *cap_buf;
 	int ret, offset;
 
-	memset(buf, 0, sizeof(buf));
 	cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset];
 	init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN);
 	cgc.sense = &sense;
@@ -2633,11 +2632,12 @@ end_io:
 
 
 
-static int pkt_merge_bvec(struct request_queue *q, struct bio *bio, struct bio_vec *bvec)
+static int pkt_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd,
+			  struct bio_vec *bvec)
 {
 	struct pktcdvd_device *pd = q->queuedata;
-	sector_t zone = ZONE(bio->bi_sector, pd);
-	int used = ((bio->bi_sector - zone) << 9) + bio->bi_size;
+	sector_t zone = ZONE(bmd->bi_sector, pd);
+	int used = ((bmd->bi_sector - zone) << 9) + bmd->bi_size;
 	int remaining = (pd->settings.size << 9) - used;
 	int remaining2;
 
@@ -2645,7 +2645,7 @@ static int pkt_merge_bvec(struct request_queue *q, struct bio *bio, struct bio_v
 	 * A bio <= PAGE_SIZE must be allowed. If it crosses a packet
 	 * boundary, pkt_make_request() will split the bio.
 	 */
-	remaining2 = PAGE_SIZE - bio->bi_size;
+	remaining2 = PAGE_SIZE - bmd->bi_size;
 	remaining = max(remaining, remaining2);
 
 	BUG_ON(remaining < 0);
@@ -2796,9 +2796,14 @@ out_mem:
 	return ret;
 }
 
-static int pkt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+static long pkt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
-	struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data;
+	struct inode *inode = file->f_path.dentry->d_inode;
+	struct pktcdvd_device *pd;
+	long ret;
+
+	lock_kernel();
+	pd = inode->i_bdev->bd_disk->private_data;
 
 	VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd, imajor(inode), iminor(inode));
 
@@ -2811,7 +2816,8 @@ static int pkt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, u
 	case CDROM_LAST_WRITTEN:
 	case CDROM_SEND_PACKET:
 	case SCSI_IOCTL_SEND_COMMAND:
-		return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg);
+		ret = blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg);
+		break;
 
 	case CDROMEJECT:
 		/*
@@ -2820,14 +2826,15 @@ static int pkt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, u
 		 */
 		if (pd->refcnt == 1)
 			pkt_lock_door(pd, 0);
-		return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg);
+		ret = blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg);
+		break;
 
 	default:
 		VPRINTK(DRIVER_NAME": Unknown ioctl for %s (%x)\n", pd->name, cmd);
-		return -ENOTTY;
+		ret = -ENOTTY;
 	}
-
-	return 0;
+	unlock_kernel();
+	return ret;
 }
 
 static int pkt_media_changed(struct gendisk *disk)
@@ -2849,7 +2856,7 @@ static struct block_device_operations pktcdvd_ops = {
 	.owner =		THIS_MODULE,
 	.open =			pkt_open,
 	.release =		pkt_close,
-	.ioctl =		pkt_ioctl,
+	.unlocked_ioctl =	pkt_ioctl,
 	.media_changed =	pkt_media_changed,
 };
 
@@ -3014,7 +3021,8 @@ static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd)
 	mutex_unlock(&ctl_mutex);
 }
 
-static int pkt_ctl_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+static long pkt_ctl_ioctl(struct file *file, unsigned int cmd,
+						unsigned long arg)
 {
 	void __user *argp = (void __user *)arg;
 	struct pkt_ctrl_command ctrl_cmd;
@@ -3031,16 +3039,22 @@ static int pkt_ctl_ioctl(struct inode *inode, struct file *file, unsigned int cm
 	case PKT_CTRL_CMD_SETUP:
 		if (!capable(CAP_SYS_ADMIN))
 			return -EPERM;
+		lock_kernel();
 		ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev);
 		ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev);
+		unlock_kernel();
 		break;
 	case PKT_CTRL_CMD_TEARDOWN:
 		if (!capable(CAP_SYS_ADMIN))
 			return -EPERM;
+		lock_kernel();
 		ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev));
+		unlock_kernel();
 		break;
 	case PKT_CTRL_CMD_STATUS:
+		lock_kernel();
 		pkt_get_status(&ctrl_cmd);
+		unlock_kernel();
 		break;
 	default:
 		return -ENOTTY;
@@ -3053,7 +3067,7 @@ static int pkt_ctl_ioctl(struct inode *inode, struct file *file, unsigned int cm
 
 
 static const struct file_operations pkt_ctl_fops = {
-	.ioctl	 = pkt_ctl_ioctl,
+	.unlocked_ioctl	 = pkt_ctl_ioctl,
 	.owner	 = THIS_MODULE,
 };
 
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index f2fff57..9ae05c5 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -38,6 +38,7 @@
 #include <linux/interrupt.h>
 #include <linux/blkdev.h>
 #include <linux/hdreg.h>
+#include <linux/cdrom.h>
 #include <linux/module.h>
 
 #include <xen/xenbus.h>
@@ -153,6 +154,40 @@ static int blkif_getgeo(struct block_device *bd, struct hd_geometry *hg)
 	return 0;
 }
 
+int blkif_ioctl(struct inode *inode, struct file *filep,
+		unsigned command, unsigned long argument)
+{
+	struct blkfront_info *info =
+		inode->i_bdev->bd_disk->private_data;
+	int i;
+
+	dev_dbg(&info->xbdev->dev, "command: 0x%x, argument: 0x%lx\n",
+		command, (long)argument);
+
+	switch (command) {
+	case CDROMMULTISESSION:
+		dev_dbg(&info->xbdev->dev, "FIXME: support multisession CDs later\n");
+		for (i = 0; i < sizeof(struct cdrom_multisession); i++)
+			if (put_user(0, (char __user *)(argument + i)))
+				return -EFAULT;
+		return 0;
+
+	case CDROM_GET_CAPABILITY: {
+		struct gendisk *gd = info->gd;
+		if (gd->flags & GENHD_FL_CD)
+			return 0;
+		return -EINVAL;
+	}
+
+	default:
+		/*printk(KERN_ALERT "ioctl %08x not supported by Xen blkdev\n",
+		  command);*/
+		return -EINVAL; /* same return as native Linux */
+	}
+
+	return 0;
+}
+
 /*
  * blkif_queue_request
  *
@@ -324,6 +359,9 @@ static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size)
 	/* Make sure buffer addresses are sector-aligned. */
 	blk_queue_dma_alignment(rq, 511);
 
+	/* Make sure we don't use bounce buffers. */
+	blk_queue_bounce_limit(rq, BLK_BOUNCE_ANY);
+
 	gd->queue = rq;
 
 	return 0;
@@ -546,7 +584,7 @@ static int setup_blkring(struct xenbus_device *dev,
 
 	info->ring_ref = GRANT_INVALID_REF;
 
-	sring = (struct blkif_sring *)__get_free_page(GFP_KERNEL);
+	sring = (struct blkif_sring *)__get_free_page(GFP_NOIO | __GFP_HIGH);
 	if (!sring) {
 		xenbus_dev_fatal(dev, -ENOMEM, "allocating shared ring");
 		return -ENOMEM;
@@ -703,7 +741,8 @@ static int blkif_recover(struct blkfront_info *info)
 	int j;
 
 	/* Stage 1: Make a safe copy of the shadow state. */
-	copy = kmalloc(sizeof(info->shadow), GFP_KERNEL);
+	copy = kmalloc(sizeof(info->shadow),
+		       GFP_NOIO | __GFP_REPEAT | __GFP_HIGH);
 	if (!copy)
 		return -ENOMEM;
 	memcpy(copy, info->shadow, sizeof(info->shadow));
@@ -959,7 +998,7 @@ static int blkif_release(struct inode *inode, struct file *filep)
 		struct xenbus_device *dev = info->xbdev;
 		enum xenbus_state state = xenbus_read_driver_state(dev->otherend);
 
-		if (state == XenbusStateClosing)
+		if (state == XenbusStateClosing && info->is_ready)
 			blkfront_closing(dev);
 	}
 	return 0;
@@ -971,6 +1010,7 @@ static struct block_device_operations xlvbd_block_fops =
 	.open = blkif_open,
 	.release = blkif_release,
 	.getgeo = blkif_getgeo,
+	.ioctl = blkif_ioctl,
 };
 
 
@@ -1006,7 +1046,7 @@ static int __init xlblk_init(void)
 module_init(xlblk_init);
 
 
-static void xlblk_exit(void)
+static void __exit xlblk_exit(void)
 {
 	return xenbus_unregister_driver(&blkfront);
 }