block: replace BKL with global mutex

index 82d5882..7c50a26 100644
@@ -843,9 +843,7 @@ static int bsg_open(struct inode *inode, struct file *file)
 {
 	struct bsg_device *bd;
 
-	lock_kernel();
 	bd = bsg_get_device(inode, file);
-	unlock_kernel();
 
 	if (IS_ERR(bd))
 		return PTR_ERR(bd);

index f26051f..11cfd3c 100644
@@ -802,16 +802,16 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 		return compat_put_u64(arg, bdev->bd_inode->i_size);
 
 	case BLKTRACESETUP32:
-		lock_kernel();
+		mutex_lock(&blkdev_mutex);
 		ret = compat_blk_trace_setup(bdev, compat_ptr(arg));
-		unlock_kernel();
+		mutex_unlock(&blkdev_mutex);
 		return ret;
 	case BLKTRACESTART: /* compatible */
 	case BLKTRACESTOP:  /* compatible */
 	case BLKTRACETEARDOWN: /* compatible */
-		lock_kernel();
+		mutex_lock(&blkdev_mutex);
 		ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
-		unlock_kernel();
+		mutex_unlock(&blkdev_mutex);
 		return ret;
 	default:
 		if (disk->fops->compat_ioctl)

index e8eb679..6b8fde1 100644
@@ -169,9 +169,9 @@ int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
 		return disk->fops->ioctl(bdev, mode, cmd, arg);
 
 	if (disk->fops->locked_ioctl) {
-		lock_kernel();
+		mutex_lock(&blkdev_mutex);
 		ret = disk->fops->locked_ioctl(bdev, mode, cmd, arg);
-		unlock_kernel();
+		mutex_unlock(&blkdev_mutex);
 		return ret;
 	}
 

@@ -206,10 +206,10 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
 		if (ret != -EINVAL && ret != -ENOTTY)
 			return ret;
 
-		lock_kernel();
+		mutex_lock(&blkdev_mutex);
 		fsync_bdev(bdev);
 		invalidate_bdev(bdev);
-		unlock_kernel();
+		mutex_unlock(&blkdev_mutex);
 		return 0;
 
 	case BLKROSET:

@@ -221,9 +221,9 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
 			return -EACCES;
 		if (get_user(n, (int __user *)(arg)))
 			return -EFAULT;
-		lock_kernel();
+		mutex_lock(&blkdev_mutex);
 		set_device_ro(bdev, n);
-		unlock_kernel();
+		mutex_unlock(&blkdev_mutex);
 		return 0;
 
 	case BLKDISCARD: {

@@ -309,14 +309,14 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
 			bd_release(bdev);
 		return ret;
 	case BLKPG:
-		lock_kernel();
+		mutex_lock(&blkdev_mutex);
 		ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
-		unlock_kernel();
+		mutex_unlock(&blkdev_mutex);
 		break;
 	case BLKRRPART:
-		lock_kernel();
+		mutex_lock(&blkdev_mutex);
 		ret = blkdev_reread_part(bdev);
-		unlock_kernel();
+		mutex_unlock(&blkdev_mutex);
 		break;
 	case BLKGETSIZE:
 		size = bdev->bd_inode->i_size;

@@ -329,9 +329,9 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
 	case BLKTRACESTOP:
 	case BLKTRACESETUP:
 	case BLKTRACETEARDOWN:
-		lock_kernel();
+		mutex_lock(&blkdev_mutex);
 		ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg);
-		unlock_kernel();
+		mutex_unlock(&blkdev_mutex);
 		break;
 	default:
 		ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);

index c5f22bb..8faaa12 100644
@@ -6620,7 +6620,7 @@ static long DAC960_gam_ioctl(struct file *file, unsigned int Request,
   long ErrorCode = 0;
   if (!capable(CAP_SYS_ADMIN)) return -EACCES;
 
-  lock_kernel();
+  mutex_lock(&blkdev_mutex);
   switch (Request)
     {
     case DAC960_IOCTL_GET_CONTROLLER_COUNT:

@@ -7051,7 +7051,7 @@ static long DAC960_gam_ioctl(struct file *file, unsigned int Request,
       default:
 	ErrorCode = -ENOTTY;
     }
-  unlock_kernel();
+  mutex_unlock(&blkdev_mutex);
   return ErrorCode;
 }
 

index 51ceaee..6bb6c4d 100644
@@ -1027,9 +1027,9 @@ static int do_ioctl(struct block_device *bdev, fmode_t mode,
 		    unsigned cmd, unsigned long arg)
 {
 	int ret;
-	lock_kernel();
+	mutex_lock(&blkdev_mutex);
 	ret = cciss_ioctl(bdev, mode, cmd, arg);
-	unlock_kernel();
+	mutex_unlock(&blkdev_mutex);
 	return ret;
 }
 

index ef752b2..927aea6 100644
@@ -229,7 +229,7 @@ sg_open(struct inode *inode, struct file *filp)
 	int res;
 	int retval;
 
-	lock_kernel();
+	mutex_lock(&blkdev_mutex);
 	nonseekable_open(inode, filp);
 	SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
 	sdp = sg_get_dev(dev);

@@ -307,7 +307,7 @@ error_out:
 sg_put:
 	if (sdp)
 		sg_put_dev(sdp);
-	unlock_kernel();
+	mutex_unlock(&blkdev_mutex);
 	return retval;
 }
 

index 7346c96..06882f9 100644
@@ -29,6 +29,9 @@
 #include <asm/uaccess.h>
 #include "internal.h"
 
+DEFINE_MUTEX(blkdev_mutex);
+EXPORT_SYMBOL_GPL(blkdev_mutex);
+
 struct bdev_inode {
 	struct block_device bdev;
 	struct inode vfs_inode;

@@ -1321,7 +1324,6 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
 		return ret;
 	}
 
-	lock_kernel();
  restart:
 
 	ret = -ENXIO;

@@ -1407,7 +1409,6 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
 	if (for_part)
 		bdev->bd_part_count++;
 	mutex_unlock(&bdev->bd_mutex);
-	unlock_kernel();
 	return 0;
 
  out_clear:

@@ -1421,7 +1422,6 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
  out_unlock_bdev:
 	mutex_unlock(&bdev->bd_mutex);
  out_unlock_kernel:
-	unlock_kernel();
 
 	if (disk)
 		module_put(disk->fops->owner);

@@ -1433,7 +1433,11 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
 
 int blkdev_get(struct block_device *bdev, fmode_t mode)
 {
-	return __blkdev_get(bdev, mode, 0);
+	int ret;
+	mutex_lock(&blkdev_mutex);
+	ret = __blkdev_get(bdev, mode, 0);
+	mutex_unlock(&blkdev_mutex);
+	return ret;
 }
 EXPORT_SYMBOL(blkdev_get);
 

@@ -1491,7 +1495,6 @@ static int __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part)
 	struct block_device *victim = NULL;
 
 	mutex_lock_nested(&bdev->bd_mutex, for_part);
-	lock_kernel();
 	if (for_part)
 		bdev->bd_part_count--;
 

@@ -1516,7 +1519,6 @@ static int __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part)
 			victim = bdev->bd_contains;
 		bdev->bd_contains = NULL;
 	}
-	unlock_kernel();
 	mutex_unlock(&bdev->bd_mutex);
 	bdput(bdev);
 	if (victim)

@@ -1526,7 +1528,11 @@ static int __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part)
 
 int blkdev_put(struct block_device *bdev, fmode_t mode)
 {
-	return __blkdev_put(bdev, mode, 0);
+	int ret;
+	mutex_lock(&blkdev_mutex);
+	ret = __blkdev_put(bdev, mode, 0);
+	mutex_unlock(&blkdev_mutex);
+	return ret;
 }
 EXPORT_SYMBOL(blkdev_put);
 

index 8b7f5e0..69aa7f1 100644
@@ -1340,6 +1340,12 @@ struct block_device_operations {
 
 extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int,
 				 unsigned long);
+
+/*
+ * replaces the big kernel lock in the block subsystem
+ */
+extern struct mutex blkdev_mutex;
+
 #else /* CONFIG_BLOCK */
 /*
  * stubs for when the block layer is configured out

index 36ea2b6..fcf17e7 100644
@@ -305,7 +305,7 @@ static int blk_dropped_open(struct inode *inode, struct file *filp)
 {
 	filp->private_data = inode->i_private;
 
-	return 0;
+	return nonseekable_open(inode, filp);
 }
 
 static ssize_t blk_dropped_read(struct file *filp, char __user *buffer,

@@ -323,13 +323,14 @@ static const struct file_operations blk_dropped_fops = {
 	.owner =	THIS_MODULE,
 	.open =		blk_dropped_open,
 	.read =		blk_dropped_read,
+	.llseek =	no_llseek,
 };
 
 static int blk_msg_open(struct inode *inode, struct file *filp)
 {
 	filp->private_data = inode->i_private;
 
-	return 0;
+	return nonseekable_open(inode, filp);
 }
 
 static ssize_t blk_msg_write(struct file *filp, const char __user *buffer,

@@ -362,6 +363,7 @@ static const struct file_operations blk_msg_fops = {
 	.owner =	THIS_MODULE,
 	.open =		blk_msg_open,
 	.write =	blk_msg_write,
+	.llseek =	no_llseek,
 };
 
 /*

@@ -1601,7 +1603,7 @@ static ssize_t sysfs_blk_trace_attr_show(struct device *dev,
 	struct block_device *bdev;
 	ssize_t ret = -ENXIO;
 
-	lock_kernel();
+	mutex_lock(&blkdev_mutex);
 	bdev = bdget(part_devt(p));
 	if (bdev == NULL)
 		goto out_unlock_kernel;

@@ -1633,7 +1635,7 @@ out_unlock_bdev:
 out_bdput:
 	bdput(bdev);
 out_unlock_kernel:
-	unlock_kernel();
+	mutex_unlock(&blkdev_mutex);
 	return ret;
 }
 

@@ -1663,7 +1665,7 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev,
 
 	ret = -ENXIO;
 
-	lock_kernel();
+	mutex_lock(&blkdev_mutex);
 	p = dev_to_part(dev);
 	bdev = bdget(part_devt(p));
 	if (bdev == NULL)

@@ -1703,7 +1705,7 @@ out_unlock_bdev:
 out_bdput:
 	bdput(bdev);
 out_unlock_kernel:
-	unlock_kernel();
+	mutex_unlock(&blkdev_mutex);
 out:
 	return ret ? ret : count;
 }

index e8eb679..1cfa8d4 100644
@@ -163,18 +163,10 @@ int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
 			unsigned cmd, unsigned long arg)
 {
 	struct gendisk *disk = bdev->bd_disk;
-	int ret;
 
 	if (disk->fops->ioctl)
 		return disk->fops->ioctl(bdev, mode, cmd, arg);
 
-	if (disk->fops->locked_ioctl) {
-		lock_kernel();
-		ret = disk->fops->locked_ioctl(bdev, mode, cmd, arg);
-		unlock_kernel();
-		return ret;
-	}
-
 	return -ENOTTY;
 }
 /*

@@ -185,8 +177,7 @@ int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
 EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
 
 /*
- * always keep this in sync with compat_blkdev_ioctl() and
- * compat_blkdev_locked_ioctl()
+ * always keep this in sync with compat_blkdev_ioctl()
  */
 int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
 			unsigned long arg)

index 832798a..7a51535 100644
@@ -60,6 +60,7 @@
 #include <linux/hdreg.h>
 #include <linux/delay.h>
 #include <linux/init.h>
+#include <linux/smp_lock.h>
 #include <linux/amifdreg.h>
 #include <linux/amifd.h>
 #include <linux/buffer_head.h>

@@ -1500,6 +1501,18 @@ static int fd_ioctl(struct block_device *bdev, fmode_t mode,
 	return 0;
 }
 
+static int fd_unlocked_ioctl(struct block_device *bdev, fmode_t mode,
+			     unsigned int cmd, unsigned long param)
+{
+	int ret;
+
+	lock_kernel();
+	ret = fd_ioctl(bdev, mode, cmd, param);
+	unlock_kernel();
+
+	return ret;
+}
+
 static void fd_probe(int dev)
 {
 	unsigned long code;

@@ -1638,7 +1651,7 @@ static const struct block_device_operations floppy_fops = {
 	.owner		= THIS_MODULE,
 	.open		= floppy_open,
 	.release	= floppy_release,
-	.locked_ioctl	= fd_ioctl,
+	.ioctl		= fd_unlocked_ioctl,
 	.getgeo		= fd_getgeo,
 	.media_changed	= amiga_floppy_change,
 };

index e35cf59..09ae46f 100644
@@ -67,6 +67,7 @@
 #include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/blkdev.h>
+#include <linux/smp_lock.h>
 
 #include <asm/atafd.h>
 #include <asm/atafdreg.h>

@@ -1665,6 +1666,17 @@ static int fd_ioctl(struct block_device *bdev, fmode_t mode,
 	}
 }
 
+static int fd_unlocked_ioctl(struct block_device *bdev, fmode_t mode,
+			     unsigned int cmd, unsigned long arg)
+{
+	int ret;
+
+	lock_kernel();
+	ret = fd_ioctl(bdev, mode, cmd, arg);
+	unlock_kernel();
+
+	return ret;
+}
 
 /* Initialize the 'unit' variable for drive 'drive' */
 

@@ -1855,7 +1867,7 @@ static const struct block_device_operations floppy_fops = {
 	.owner		= THIS_MODULE,
 	.open		= floppy_open,
 	.release	= floppy_release,
-	.locked_ioctl	= fd_ioctl,
+	.ioctl		= fd_unlocked_ioctl,
 	.media_changed	= check_floppy_change,
 	.revalidate_disk= floppy_revalidate,
 };

index 6081e81..b424cca 100644
@@ -15,6 +15,7 @@
 #include <linux/blkdev.h>
 #include <linux/bio.h>
 #include <linux/highmem.h>
+#include <linux/smp_lock.h>
 #include <linux/radix-tree.h>
 #include <linux/buffer_head.h> /* invalidate_bh_lrus() */
 #include <linux/slab.h>

@@ -355,6 +356,7 @@ static int brd_ioctl(struct block_device *bdev, fmode_t mode,
 	 * ram device BLKFLSBUF has special semantics, we want to actually
 	 * release and destroy the ramdisk data.
 	 */
+	lock_kernel();
 	mutex_lock(&bdev->bd_mutex);
 	error = -EBUSY;
 	if (bdev->bd_openers <= 1) {

@@ -371,13 +373,14 @@ static int brd_ioctl(struct block_device *bdev, fmode_t mode,
 		error = 0;
 	}
 	mutex_unlock(&bdev->bd_mutex);
+	unlock_kernel();
 
 	return error;
 }
 
 static const struct block_device_operations brd_fops = {
 	.owner =		THIS_MODULE,
-	.locked_ioctl =		brd_ioctl,
+	.ioctl =		brd_ioctl,
 #ifdef CONFIG_BLK_DEV_XIP
 	.direct_access =	brd_direct_access,
 #endif

index 51ceaee..6c3c8c4 100644
@@ -170,6 +170,8 @@ static void do_cciss_request(struct request_queue *q);
 static irqreturn_t do_cciss_intr(int irq, void *dev_id);
 static int cciss_open(struct block_device *bdev, fmode_t mode);
 static int cciss_release(struct gendisk *disk, fmode_t mode);
+static int do_ioctl(struct block_device *bdev, fmode_t mode,
+		    unsigned int cmd, unsigned long arg);
 static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
 		       unsigned int cmd, unsigned long arg);
 static int cciss_getgeo(struct block_device *bdev, struct hd_geometry *geo);

@@ -223,7 +225,7 @@ static const struct block_device_operations cciss_fops = {
 	.owner = THIS_MODULE,
 	.open = cciss_open,
 	.release = cciss_release,
-	.locked_ioctl = cciss_ioctl,
+	.ioctl = do_ioctl,
 	.getgeo = cciss_getgeo,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl = cciss_compat_ioctl,

@@ -1021,8 +1023,6 @@ static int cciss_release(struct gendisk *disk, fmode_t mode)
 	return 0;
 }
 
-#ifdef CONFIG_COMPAT
-
 static int do_ioctl(struct block_device *bdev, fmode_t mode,
 		    unsigned cmd, unsigned long arg)
 {

@@ -1033,6 +1033,8 @@ static int do_ioctl(struct block_device *bdev, fmode_t mode,
 	return ret;
 }
 
+#ifdef CONFIG_COMPAT
+
 static int cciss_ioctl32_passthru(struct block_device *bdev, fmode_t mode,
 				  unsigned cmd, unsigned long arg);
 static int cciss_ioctl32_big_passthru(struct block_device *bdev, fmode_t mode,

index 91d1163..072e57c 100644
@@ -35,6 +35,7 @@
 #include <linux/seq_file.h>
 #include <linux/init.h>
 #include <linux/hdreg.h>
+#include <linux/smp_lock.h>
 #include <linux/spinlock.h>
 #include <linux/blkdev.h>
 #include <linux/genhd.h>

@@ -159,7 +160,7 @@ static int sendcmd(
 
 static int ida_open(struct block_device *bdev, fmode_t mode);
 static int ida_release(struct gendisk *disk, fmode_t mode);
-static int ida_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg);
+static int ida_unlocked_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg);
 static int ida_getgeo(struct block_device *bdev, struct hd_geometry *geo);
 static int ida_ctlr_ioctl(ctlr_info_t *h, int dsk, ida_ioctl_t *io);
 

@@ -197,7 +198,7 @@ static const struct block_device_operations ida_fops  = {
 	.owner		= THIS_MODULE,
 	.open		= ida_open,
 	.release	= ida_release,
-	.locked_ioctl	= ida_ioctl,
+	.ioctl		= ida_unlocked_ioctl,
 	.getgeo		= ida_getgeo,
 	.revalidate_disk= ida_revalidate,
 };

@@ -1192,6 +1193,19 @@ out_passthru:
 	}
 		
 }
+
+static int ida_unlocked_ioctl(struct block_device *bdev, fmode_t mode,
+			     unsigned int cmd, unsigned long param)
+{
+	int ret;
+
+	lock_kernel();
+	ret = ida_ioctl(bdev, mode, cmd, param);
+	unlock_kernel();
+
+	return ret;
+}
+
 /*
  * ida_ctlr_ioctl is for passing commands to the controller from userspace.
  * The command block (io) has already been copied to kernel space for us,

index 90c4038..c61df47 100644
@@ -178,6 +178,7 @@ static int print_unex = 1;
 #include <linux/slab.h>
 #include <linux/mm.h>
 #include <linux/bio.h>
+#include <linux/smp_lock.h>
 #include <linux/string.h>
 #include <linux/jiffies.h>
 #include <linux/fcntl.h>

@@ -3593,6 +3594,18 @@ static int fd_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
 	return 0;
 }
 
+static int fd_unlocked_ioctl(struct block_device *bdev, fmode_t mode,
+			     unsigned int cmd, unsigned long param)
+{
+	int ret;
+
+	lock_kernel();
+	ret = fd_ioctl(bdev, mode, cmd, param);
+	unlock_kernel();
+
+	return ret;
+}
+
 static void __init config_types(void)
 {
 	bool has_drive = false;

@@ -3893,7 +3906,7 @@ static const struct block_device_operations floppy_fops = {
 	.owner			= THIS_MODULE,
 	.open			= floppy_open,
 	.release		= floppy_release,
-	.locked_ioctl		= fd_ioctl,
+	.ioctl			= fd_unlocked_ioctl,
 	.getgeo			= fd_getgeo,
 	.media_changed		= check_floppy_change,
 	.revalidate_disk	= floppy_revalidate,

index 218d091..9789907 100644
@@ -24,6 +24,7 @@
 #include <linux/errno.h>
 #include <linux/file.h>
 #include <linux/ioctl.h>
+#include <linux/smp_lock.h>
 #include <linux/compiler.h>
 #include <linux/err.h>
 #include <linux/kernel.h>

@@ -716,9 +717,11 @@ static int nbd_ioctl(struct block_device *bdev, fmode_t mode,
 	dprintk(DBG_IOCTL, "%s: nbd_ioctl cmd=%s(0x%x) arg=%lu\n",
 			lo->disk->disk_name, ioctl_cmd_to_ascii(cmd), cmd, arg);
 
+	lock_kernel();
 	mutex_lock(&lo->tx_lock);
 	error = __nbd_ioctl(bdev, lo, cmd, arg);
 	mutex_unlock(&lo->tx_lock);
+	unlock_kernel();
 
 	return error;
 }

@@ -726,7 +729,7 @@ static int nbd_ioctl(struct block_device *bdev, fmode_t mode,
 static const struct block_device_operations nbd_fops =
 {
 	.owner =	THIS_MODULE,
-	.locked_ioctl =	nbd_ioctl,
+	.ioctl =	nbd_ioctl,
 };
 
 /*

index 71acf4e..daba7a6 100644
@@ -138,6 +138,7 @@ enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_DLY};
 #include <linux/cdrom.h>
 #include <linux/spinlock.h>
 #include <linux/blkdev.h>
+#include <linux/smp_lock.h>
 #include <asm/uaccess.h>
 
 static DEFINE_SPINLOCK(pcd_lock);

@@ -238,7 +239,13 @@ static int pcd_block_ioctl(struct block_device *bdev, fmode_t mode,
 				unsigned cmd, unsigned long arg)
 {
 	struct pcd_unit *cd = bdev->bd_disk->private_data;
-	return cdrom_ioctl(&cd->info, bdev, mode, cmd, arg);
+	int ret;
+
+	lock_kernel();
+	ret = cdrom_ioctl(&cd->info, bdev, mode, cmd, arg);
+	unlock_kernel();
+
+	return ret;
 }
 
 static int pcd_block_media_changed(struct gendisk *disk)

@@ -251,7 +258,7 @@ static const struct block_device_operations pcd_bdops = {
 	.owner		= THIS_MODULE,
 	.open		= pcd_block_open,
 	.release	= pcd_block_release,
-	.locked_ioctl	= pcd_block_ioctl,
+	.ioctl		= pcd_block_ioctl,
 	.media_changed	= pcd_block_media_changed,
 };
 

index c1e5cd0..b22943a 100644
@@ -153,6 +153,7 @@ enum {D_PRT, D_PRO, D_UNI, D_MOD, D_GEO, D_SBY, D_DLY, D_SLV};
 #include <linux/blkdev.h>
 #include <linux/blkpg.h>
 #include <linux/kernel.h>
+#include <linux/smp_lock.h>
 #include <asm/uaccess.h>
 #include <linux/workqueue.h>
 

@@ -768,8 +769,10 @@ static int pd_ioctl(struct block_device *bdev, fmode_t mode,
 
 	switch (cmd) {
 	case CDROMEJECT:
+		lock_kernel();
 		if (disk->access == 1)
 			pd_special_command(disk, pd_eject);
+		unlock_kernel();
 		return 0;
 	default:
 		return -EINVAL;

@@ -812,7 +815,7 @@ static const struct block_device_operations pd_fops = {
 	.owner		= THIS_MODULE,
 	.open		= pd_open,
 	.release	= pd_release,
-	.locked_ioctl	= pd_ioctl,
+	.ioctl		= pd_ioctl,
 	.getgeo		= pd_getgeo,
 	.media_changed	= pd_check_media,
 	.revalidate_disk= pd_revalidate

index c059aab..38b4d56 100644
@@ -152,6 +152,7 @@ enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_LUN, D_DLY};
 #include <linux/spinlock.h>
 #include <linux/blkdev.h>
 #include <linux/blkpg.h>
+#include <linux/smp_lock.h>
 #include <asm/uaccess.h>
 
 static DEFINE_SPINLOCK(pf_spin_lock);

@@ -266,7 +267,7 @@ static const struct block_device_operations pf_fops = {
 	.owner		= THIS_MODULE,
 	.open		= pf_open,
 	.release	= pf_release,
-	.locked_ioctl	= pf_ioctl,
+	.ioctl		= pf_ioctl,
 	.getgeo		= pf_getgeo,
 	.media_changed	= pf_check_media,
 };

@@ -342,7 +343,10 @@ static int pf_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, u
 
 	if (pf->access != 1)
 		return -EBUSY;
+	lock_kernel();
 	pf_eject(pf);
+	unlock_kernel();
+
 	return 0;
 }
 

index 8a549db..1f70aec 100644
@@ -57,6 +57,7 @@
 #include <linux/seq_file.h>
 #include <linux/miscdevice.h>
 #include <linux/freezer.h>
+#include <linux/smp_lock.h>
 #include <linux/mutex.h>
 #include <linux/slab.h>
 #include <scsi/scsi_cmnd.h>

@@ -2762,10 +2763,12 @@ out_mem:
 static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg)
 {
 	struct pktcdvd_device *pd = bdev->bd_disk->private_data;
+	int ret;
 
 	VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd,
 		MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev));
 
+	lock_kernel();
 	switch (cmd) {
 	case CDROMEJECT:
 		/*

@@ -2783,12 +2786,14 @@ static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
 	case CDROM_LAST_WRITTEN:
 	case CDROM_SEND_PACKET:
 	case SCSI_IOCTL_SEND_COMMAND:
-		return __blkdev_driver_ioctl(pd->bdev, mode, cmd, arg);
+		ret = __blkdev_driver_ioctl(pd->bdev, mode, cmd, arg);
+		break;
 
 	default:
 		VPRINTK(DRIVER_NAME": Unknown ioctl for %s (%x)\n", pd->name, cmd);
-		return -ENOTTY;
+		ret = -ENOTTY;
 	}
+	unlock_kernel();
 
 	return 0;
 }

@@ -2812,7 +2817,7 @@ static const struct block_device_operations pktcdvd_ops = {
 	.owner =		THIS_MODULE,
 	.open =			pkt_open,
 	.release =		pkt_close,
-	.locked_ioctl =		pkt_ioctl,
+	.ioctl =		pkt_ioctl,
 	.media_changed =	pkt_media_changed,
 };
 

index e463657..f04f74e 100644
@@ -20,6 +20,7 @@
 #include <linux/fd.h>
 #include <linux/slab.h>
 #include <linux/blkdev.h>
+#include <linux/smp_lock.h>
 #include <linux/hdreg.h>
 #include <linux/kernel.h>
 #include <linux/delay.h>

@@ -690,7 +691,9 @@ static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
 	case FDEJECT:
 		if (fs->ref_count != 1)
 			return -EBUSY;
+		lock_kernel();
 		err = floppy_eject(fs);
+		unlock_kernel();
 		return err;
 
 	case FDGETPRM:

@@ -753,7 +756,7 @@ static const struct block_device_operations floppy_fops = {
 	.owner		 = THIS_MODULE,
 	.open		 = floppy_open,
 	.release	 = floppy_release,
-	.locked_ioctl	 = floppy_ioctl,
+	.ioctl		 = floppy_ioctl,
 	.getgeo		 = floppy_getgeo,
 	.media_changed	 = floppy_check_change,
 	.revalidate_disk = floppy_revalidate,

index 52f2d11..4a83540 100644
@@ -25,6 +25,7 @@
 #include <linux/ioctl.h>
 #include <linux/blkdev.h>
 #include <linux/interrupt.h>
+#include <linux/smp_lock.h>
 #include <linux/module.h>
 #include <linux/spinlock.h>
 #include <asm/io.h>

@@ -867,6 +868,18 @@ static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
 	return -ENOTTY;
 }
 
+static int floppy_unlocked_ioctl(struct block_device *bdev, fmode_t mode,
+				 unsigned int cmd, unsigned long param)
+{
+	int ret;
+
+	lock_kernel();
+	ret = floppy_ioctl(bdev, mode, cmd, param);
+	unlock_kernel();
+
+	return ret;
+}
+
 static int floppy_open(struct block_device *bdev, fmode_t mode)
 {
 	struct floppy_state *fs = bdev->bd_disk->private_data;

@@ -997,7 +1010,7 @@ static int floppy_revalidate(struct gendisk *disk)
 static const struct block_device_operations floppy_fops = {
 	.open		= floppy_open,
 	.release	= floppy_release,
-	.locked_ioctl	= floppy_ioctl,
+	.ioctl		= floppy_unlocked_ioctl,
 	.media_changed	= floppy_check_change,
 	.revalidate_disk= floppy_revalidate,
 };

index 0536b5b..d6e14d2 100644
@@ -28,6 +28,7 @@
 #include <linux/timer.h>
 #include <linux/scatterlist.h>
 #include <linux/slab.h>
+#include <linux/smp_lock.h>
 #include <scsi/scsi.h>
 
 #define DRV_NAME "ub"

@@ -1729,8 +1730,13 @@ static int ub_bd_ioctl(struct block_device *bdev, fmode_t mode,
 {
 	struct gendisk *disk = bdev->bd_disk;
 	void __user *usermem = (void __user *) arg;
+	int ret;
+
+	lock_kernel();
+	ret = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, usermem);
+	unlock_kernel();
 
-	return scsi_cmd_ioctl(disk->queue, disk, mode, cmd, usermem);
+	return ret;
 }
 
 /*

@@ -1794,7 +1800,7 @@ static const struct block_device_operations ub_bd_fops = {
 	.owner		= THIS_MODULE,
 	.open		= ub_bd_open,
 	.release	= ub_bd_release,
-	.locked_ioctl	= ub_bd_ioctl,
+	.ioctl		= ub_bd_ioctl,
 	.media_changed	= ub_bd_media_changed,
 	.revalidate_disk = ub_bd_revalidate,
 };

index 83fa09a..a0f9383 100644
@@ -2,6 +2,7 @@
 #include <linux/spinlock.h>
 #include <linux/slab.h>
 #include <linux/blkdev.h>
+#include <linux/smp_lock.h>
 #include <linux/hdreg.h>
 #include <linux/virtio.h>
 #include <linux/virtio_blk.h>

@@ -245,6 +246,18 @@ static int virtblk_ioctl(struct block_device *bdev, fmode_t mode,
 			      (void __user *)data);
 }
 
+static int virtblk_unlocked_ioctl(struct block_device *bdev, fmode_t mode,
+			     unsigned int cmd, unsigned long param)
+{
+	int ret;
+
+	lock_kernel();
+	ret = virtblk_ioctl(bdev, mode, cmd, param);
+	unlock_kernel();
+
+	return ret;
+}
+
 /* We provide getgeo only to please some old bootloader/partitioning tools */
 static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
 {

@@ -271,7 +284,7 @@ static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
 }
 
 static const struct block_device_operations virtblk_fops = {
-	.locked_ioctl = virtblk_ioctl,
+	.ioctl  = virtblk_unlocked_ioctl,
 	.owner  = THIS_MODULE,
 	.getgeo = virtblk_getgeo,
 };

index 18a80ff..7f00543 100644
@@ -46,6 +46,7 @@
 #include <linux/init.h>
 #include <linux/wait.h>
 #include <linux/blkdev.h>
+#include <linux/smp_lock.h>
 #include <linux/blkpg.h>
 #include <linux/delay.h>
 #include <linux/io.h>

@@ -133,7 +134,7 @@ static int xd_getgeo(struct block_device *bdev, struct hd_geometry *geo);
 
 static const struct block_device_operations xd_fops = {
 	.owner	= THIS_MODULE,
-	.locked_ioctl	= xd_ioctl,
+	.ioctl	= xd_unlocked_ioctl,
 	.getgeo = xd_getgeo,
 };
 static DECLARE_WAIT_QUEUE_HEAD(xd_wait_int);

@@ -375,6 +376,18 @@ static int xd_ioctl(struct block_device *bdev, fmode_t mode, u_int cmd, u_long a
 	}
 }
 
+static int xd_unlocked_ioctl(struct block_device *bdev, fmode_t mode,
+			     unsigned int cmd, unsigned long param)
+{
+	int ret;
+
+	lock_kernel();
+	ret = xd_ioctl(bdev, mode, cmd, param);
+	unlock_kernel();
+
+	return ret;
+}
+
 /* xd_readwrite: handle a read/write request */
 static int xd_readwrite (u_char operation,XD_INFO *p,char *buffer,u_int block,u_int count)
 {

index 37cacef..bded505 100644
@@ -105,7 +105,7 @@ static u_char xd_detect (u_char *controller, unsigned int *address);
 static u_char xd_initdrives (void (*init_drive)(u_char drive));
 
 static void do_xd_request (struct request_queue * q);
-static int xd_ioctl (struct block_device *bdev,fmode_t mode,unsigned int cmd,unsigned long arg);
+static int xd_unlocked_ioctl (struct block_device *bdev,fmode_t mode,unsigned int cmd,unsigned long arg);
 static int xd_readwrite (u_char operation,XD_INFO *disk,char *buffer,u_int block,u_int count);
 static void xd_recalibrate (u_char drive);
 

index 82ed403..96a70bb 100644
@@ -1046,7 +1046,7 @@ static const struct block_device_operations xlvbd_block_fops =
 	.open = blkif_open,
 	.release = blkif_release,
 	.getgeo = blkif_getgeo,
-	.locked_ioctl = blkif_ioctl,
+	.ioctl = blkif_ioctl,
 };
 
 

index 03c71f7..7d7b894 100644
@@ -32,6 +32,7 @@
 #include <linux/blkdev.h>
 #include <linux/interrupt.h>
 #include <linux/device.h>
+#include <linux/smp_lock.h>
 #include <linux/wait.h>
 #include <linux/workqueue.h>
 #include <linux/platform_device.h>

@@ -509,7 +510,13 @@ static int gdrom_bdops_mediachanged(struct gendisk *disk)
 static int gdrom_bdops_ioctl(struct block_device *bdev, fmode_t mode,
 	unsigned cmd, unsigned long arg)
 {
-	return cdrom_ioctl(gd.cd_info, bdev, mode, cmd, arg);
+	int ret;
+
+	lock_kernel();
+	ret = cdrom_ioctl(gd.cd_info, bdev, mode, cmd, arg);
+	unlock_kernel();
+
+	return ret;
 }
 
 static const struct block_device_operations gdrom_bdops = {

@@ -517,7 +524,7 @@ static const struct block_device_operations gdrom_bdops = {
 	.open			= gdrom_bdops_open,
 	.release		= gdrom_bdops_release,
 	.media_changed		= gdrom_bdops_mediachanged,
-	.locked_ioctl		= gdrom_bdops_ioctl,
+	.ioctl			= gdrom_bdops_ioctl,
 };
 
 static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id)

index 451cd70..203c87c 100644
@@ -40,6 +40,7 @@
 #include <linux/module.h>
 #include <linux/completion.h>
 #include <linux/proc_fs.h>
+#include <linux/smp_lock.h>
 #include <linux/seq_file.h>
 #include <linux/scatterlist.h>
 

@@ -168,7 +169,13 @@ static int viocd_blk_ioctl(struct block_device *bdev, fmode_t mode,
 		unsigned cmd, unsigned long arg)
 {
 	struct disk_info *di = bdev->bd_disk->private_data;
-	return cdrom_ioctl(&di->viocd_info, bdev, mode, cmd, arg);
+	int ret;
+
+	lock_kernel();
+	ret = cdrom_ioctl(&di->viocd_info, bdev, mode, cmd, arg);
+	unlock_kernel();
+
+	return ret;
 }
 
 static int viocd_blk_media_changed(struct gendisk *disk)

@@ -181,7 +188,7 @@ static const struct block_device_operations viocd_fops = {
 	.owner =		THIS_MODULE,
 	.open =			viocd_blk_open,
 	.release =		viocd_blk_release,
-	.locked_ioctl =		viocd_blk_ioctl,
+	.ioctl =		viocd_blk_ioctl,
 	.media_changed =	viocd_blk_media_changed,
 };
 

index 64207df..03c93ae 100644
@@ -31,6 +31,7 @@
 #include <linux/delay.h>
 #include <linux/timer.h>
 #include <linux/seq_file.h>
+#include <linux/smp_lock.h>
 #include <linux/slab.h>
 #include <linux/interrupt.h>
 #include <linux/errno.h>

@@ -1670,6 +1671,19 @@ static int idecd_ioctl(struct block_device *bdev, fmode_t mode,
 	return err;
 }
 
+static int idecd_unlocked_ioctl(struct block_device *bdev, fmode_t mode,
+			     unsigned int cmd, unsigned long arg)
+{
+	int ret;
+
+	lock_kernel();
+	ret = idecd_ioctl(bdev, mode, cmd, arg);
+	unlock_kernel();
+
+	return ret;
+}
+
+
 static int idecd_media_changed(struct gendisk *disk)
 {
 	struct cdrom_info *info = ide_drv_g(disk, cdrom_info);

@@ -1690,7 +1704,7 @@ static const struct block_device_operations idecd_ops = {
 	.owner			= THIS_MODULE,
 	.open			= idecd_open,
 	.release		= idecd_release,
-	.locked_ioctl		= idecd_ioctl,
+	.ioctl			= idecd_unlocked_ioctl,
 	.media_changed		= idecd_media_changed,
 	.revalidate_disk	= idecd_revalidate_disk
 };

index 7b783dd..ec94c66 100644
@@ -1,6 +1,7 @@
 #include <linux/kernel.h>
 #include <linux/ide.h>
 #include <linux/hdreg.h>
+#include <linux/smp_lock.h>
 
 #include "ide-disk.h"
 

@@ -18,9 +19,13 @@ int ide_disk_ioctl(ide_drive_t *drive, struct block_device *bdev, fmode_t mode,
 {
 	int err;
 
+	lock_kernel();
 	err = ide_setting_ioctl(drive, bdev, cmd, arg, ide_disk_ioctl_settings);
 	if (err != -EOPNOTSUPP)
-		return err;
+		goto out;
 
-	return generic_ide_ioctl(drive, bdev, cmd, arg);
+	err = generic_ide_ioctl(drive, bdev, cmd, arg);
+out:
+	unlock_kernel();
+	return err;
 }

index 9c22882..fd3d05a 100644
@@ -5,6 +5,7 @@
 #include <linux/kernel.h>
 #include <linux/ide.h>
 #include <linux/cdrom.h>
+#include <linux/smp_lock.h>
 
 #include <asm/unaligned.h>
 

@@ -275,12 +276,15 @@ int ide_floppy_ioctl(ide_drive_t *drive, struct block_device *bdev,
 	void __user *argp = (void __user *)arg;
 	int err;
 
-	if (cmd == CDROMEJECT || cmd == CDROM_LOCKDOOR)
-		return ide_floppy_lockdoor(drive, &pc, arg, cmd);
+	lock_kernel();
+	if (cmd == CDROMEJECT || cmd == CDROM_LOCKDOOR) {
+		err = ide_floppy_lockdoor(drive, &pc, arg, cmd);
+		goto out;
+	}
 
 	err = ide_floppy_format_ioctl(drive, &pc, mode, cmd, argp);
 	if (err != -ENOTTY)
-		return err;
+		goto out;
 
 	/*
 	 * skip SCSI_IOCTL_SEND_COMMAND (deprecated)

@@ -293,5 +297,7 @@ int ide_floppy_ioctl(ide_drive_t *drive, struct block_device *bdev,
 	if (err == -ENOTTY)
 		err = generic_ide_ioctl(drive, bdev, cmd, arg);
 
+out:
+	unlock_kernel();
 	return err;
 }

index c102d23..883f0c9 100644
@@ -323,7 +323,7 @@ static const struct block_device_operations ide_gd_ops = {
 	.owner			= THIS_MODULE,
 	.open			= ide_gd_open,
 	.release		= ide_gd_release,
-	.locked_ioctl		= ide_gd_ioctl,
+	.ioctl			= ide_gd_ioctl,
 	.getgeo			= ide_gd_getgeo,
 	.media_changed		= ide_gd_media_changed,
 	.unlock_native_capacity	= ide_gd_unlock_native_capacity,

index b072328..2487916 100644
@@ -32,6 +32,7 @@
 #include <linux/errno.h>
 #include <linux/genhd.h>
 #include <linux/seq_file.h>
+#include <linux/smp_lock.h>
 #include <linux/slab.h>
 #include <linux/pci.h>
 #include <linux/ide.h>

@@ -1926,9 +1927,14 @@ static int idetape_ioctl(struct block_device *bdev, fmode_t mode,
 {
 	struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj);
 	ide_drive_t *drive = tape->drive;
-	int err = generic_ide_ioctl(drive, bdev, cmd, arg);
+	int err;
+
+	lock_kernel();
+	err = generic_ide_ioctl(drive, bdev, cmd, arg);
 	if (err == -EINVAL)
 		err = idetape_blkdev_ioctl(drive, cmd, arg);
+	unlock_kernel();
+
 	return err;
 }
 

@@ -1936,7 +1942,7 @@ static const struct block_device_operations idetape_block_ops = {
 	.owner		= THIS_MODULE,
 	.open		= idetape_open,
 	.release	= idetape_release,
-	.locked_ioctl	= idetape_ioctl,
+	.ioctl		= idetape_ioctl,
 };
 
 static int ide_tape_probe(ide_drive_t *drive)

index fc593fb..1f3b080 100644
@@ -53,6 +53,7 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/i2o.h>
+#include <linux/smp_lock.h>
 
 #include <linux/mempool.h>
 

@@ -678,6 +679,18 @@ static int i2o_block_ioctl(struct block_device *bdev, fmode_t mode,
 	return -ENOTTY;
 };
 
+static int i2o_block_unlocked_ioctl(struct block_device *bdev, fmode_t mode,
+			     unsigned int cmd, unsigned long arg)
+{
+	int ret;
+
+	lock_kernel();
+	ret = i2o_block_ioctl(bdev, mode, cmd, arg);
+	unlock_kernel();
+
+	return ret;
+}
+
 /**
  *	i2o_block_media_changed - Have we seen a media change?
  *	@disk: gendisk which should be verified

@@ -930,7 +943,7 @@ static const struct block_device_operations i2o_block_fops = {
 	.owner = THIS_MODULE,
 	.open = i2o_block_open,
 	.release = i2o_block_release,
-	.locked_ioctl = i2o_block_ioctl,
+	.ioctl = i2o_block_unlocked_ioctl,
 	.getgeo = i2o_block_getgeo,
 	.media_changed = i2o_block_media_changed
 };

index 03e19c1..3ddc95b 100644
@@ -15,6 +15,7 @@
 #include <linux/blkdev.h>
 #include <linux/blkpg.h>
 #include <linux/spinlock.h>
+#include <linux/smp_lock.h>
 #include <linux/hdreg.h>
 #include <linux/init.h>
 #include <linux/mutex.h>

@@ -237,6 +238,7 @@ static int blktrans_ioctl(struct block_device *bdev, fmode_t mode,
 	if (!dev)
 		return ret;
 
+	lock_kernel();
 	mutex_lock(&dev->lock);
 
 	if (!dev->mtd)

@@ -250,6 +252,7 @@ static int blktrans_ioctl(struct block_device *bdev, fmode_t mode,
 	}
 unlock:
 	mutex_unlock(&dev->lock);
+	unlock_kernel();
 	blktrans_dev_put(dev);
 	return ret;
 }

@@ -258,7 +261,7 @@ static const struct block_device_operations mtd_blktrans_ops = {
 	.owner		= THIS_MODULE,
 	.open		= blktrans_open,
 	.release	= blktrans_release,
-	.locked_ioctl	= blktrans_ioctl,
+	.ioctl		= blktrans_ioctl,
 	.getgeo		= blktrans_getgeo,
 };
 

index 829cc37..858c89d 100644
@@ -46,6 +46,7 @@
 #include <linux/blkdev.h>
 #include <linux/blkpg.h>
 #include <linux/delay.h>
+#include <linux/smp_lock.h>
 #include <linux/mutex.h>
 #include <linux/string_helpers.h>
 #include <linux/async.h>

@@ -914,6 +915,18 @@ static int sd_ioctl(struct block_device *bdev, fmode_t mode,
 	return scsi_ioctl(sdp, cmd, p);
 }
 
+static int sd_unlocked_ioctl(struct block_device *bdev, fmode_t mode,
+			     unsigned int cmd, unsigned long arg)
+{
+	int ret;
+
+	lock_kernel();
+	ret = sd_ioctl(bdev, mode, cmd, arg);
+	unlock_kernel();
+
+	return ret;
+}
+
 static void set_media_not_present(struct scsi_disk *sdkp)
 {
 	sdkp->media_present = 0;

@@ -1094,7 +1107,7 @@ static const struct block_device_operations sd_fops = {
 	.owner			= THIS_MODULE,
 	.open			= sd_open,
 	.release		= sd_release,
-	.locked_ioctl		= sd_ioctl,
+	.ioctl			= sd_unlocked_ioctl,
 	.getgeo			= sd_getgeo,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl		= sd_compat_ioctl,

index 0a90abc..ad62aa8 100644
@@ -44,6 +44,7 @@
 #include <linux/init.h>
 #include <linux/blkdev.h>
 #include <linux/mutex.h>
+#include <linux/smp_lock.h>
 #include <linux/slab.h>
 #include <asm/uaccess.h>
 

@@ -520,6 +521,18 @@ static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
 	return scsi_ioctl(sdev, cmd, argp);
 }
 
+static int sr_block_unlocked_ioctl(struct block_device *bdev, fmode_t mode,
+				   unsigned int cmd, unsigned long arg)
+{
+	int ret;
+
+	lock_kernel();
+	ret = sr_block_ioctl(bdev, mode, cmd, arg);
+	unlock_kernel();
+
+	return ret;
+}
+
 static int sr_block_media_changed(struct gendisk *disk)
 {
 	struct scsi_cd *cd = scsi_cd(disk);

@@ -531,7 +544,7 @@ static const struct block_device_operations sr_bdops =
 	.owner		= THIS_MODULE,
 	.open		= sr_block_open,
 	.release	= sr_block_release,
-	.locked_ioctl	= sr_block_ioctl,
+	.ioctl		= sr_block_unlocked_ioctl,
 	.media_changed	= sr_block_media_changed,
 	/* 
 	 * No compat_ioctl for now because sr_block_ioctl never

index 8b7f5e0..e947688 100644
@@ -1324,7 +1324,6 @@ static inline int blk_integrity_rq(struct request *rq)
 struct block_device_operations {
 	int (*open) (struct block_device *, fmode_t);
 	int (*release) (struct gendisk *, fmode_t);
-	int (*locked_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
 	int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
 	int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
 	int (*direct_access) (struct block_device *, sector_t,

index da992a3..1bcd208 100644
@@ -33,6 +33,7 @@
 #include "linux/mm.h"
 #include "linux/slab.h"
 #include "linux/vmalloc.h"
+#include "linux/smp_lock.h"
 #include "linux/blkpg.h"
 #include "linux/genhd.h"
 #include "linux/spinlock.h"

@@ -1098,6 +1099,7 @@ static int ubd_open(struct block_device *bdev, fmode_t mode)
 	struct ubd *ubd_dev = disk->private_data;
 	int err = 0;
 
+	lock_kernel();
 	if(ubd_dev->count == 0){
 		err = ubd_open_dev(ubd_dev);
 		if(err){

@@ -1115,7 +1117,8 @@ static int ubd_open(struct block_device *bdev, fmode_t mode)
 	        if(--ubd_dev->count == 0) ubd_close_dev(ubd_dev);
 	        err = -EROFS;
 	}*/
- out:
+out:
+	unlock_kernel();
 	return err;
 }
 

@@ -1123,8 +1126,10 @@ static int ubd_release(struct gendisk *disk, fmode_t mode)
 {
 	struct ubd *ubd_dev = disk->private_data;
 
+	lock_kernel();
 	if(--ubd_dev->count == 0)
 		ubd_close_dev(ubd_dev);
+	unlock_kernel();
 	return 0;
 }
 

index c5f22bb..4e2c367 100644
@@ -79,23 +79,28 @@ static int DAC960_open(struct block_device *bdev, fmode_t mode)
 	struct gendisk *disk = bdev->bd_disk;
 	DAC960_Controller_T *p = disk->queue->queuedata;
 	int drive_nr = (long)disk->private_data;
+	int ret = -ENXIO;
 
+	lock_kernel();
 	if (p->FirmwareType == DAC960_V1_Controller) {
 		if (p->V1.LogicalDriveInformation[drive_nr].
 		    LogicalDriveState == DAC960_V1_LogicalDrive_Offline)
-			return -ENXIO;
+			goto out;
 	} else {
 		DAC960_V2_LogicalDeviceInfo_T *i =
 			p->V2.LogicalDeviceInformation[drive_nr];
 		if (!i || i->LogicalDeviceState == DAC960_V2_LogicalDevice_Offline)
-			return -ENXIO;
+			goto out;
 	}
 
 	check_disk_change(bdev);
 
 	if (!get_capacity(p->disks[drive_nr]))
-		return -ENXIO;
-	return 0;
+		goto out;
+	ret = 0;
+out:
+	unlock_kernel();
+	return ret;
 }
 
 static int DAC960_getgeo(struct block_device *bdev, struct hd_geometry *geo)

index 7a51535..8af7af7 100644
@@ -1555,10 +1555,13 @@ static int floppy_open(struct block_device *bdev, fmode_t mode)
 	int old_dev;
 	unsigned long flags;
 
+	lock_kernel();
 	old_dev = fd_device[drive];
 
-	if (fd_ref[drive] && old_dev != system)
+	if (fd_ref[drive] && old_dev != system) {
+		unlock_kernel();
 		return -EBUSY;
+	}
 
 	if (mode & (FMODE_READ|FMODE_WRITE)) {
 		check_disk_change(bdev);

@@ -1571,8 +1574,10 @@ static int floppy_open(struct block_device *bdev, fmode_t mode)
 			fd_deselect (drive);
 			rel_fdc();
 
-			if (wrprot)
+			if (wrprot) {
+				unlock_kernel();
 				return -EROFS;
+			}
 		}
 	}
 

@@ -1589,6 +1594,7 @@ static int floppy_open(struct block_device *bdev, fmode_t mode)
 	printk(KERN_INFO "fd%d: accessing %s-disk with %s-layout\n",drive,
 	       unit[drive].type->name, data_types[system].name);
 
+	unlock_kernel();
 	return 0;
 }
 

@@ -1597,6 +1603,7 @@ static int floppy_release(struct gendisk *disk, fmode_t mode)
 	struct amiga_floppy_struct *p = disk->private_data;
 	int drive = p - unit;
 
+	lock_kernel();
 	if (unit[drive].dirty == 1) {
 		del_timer (flush_track_timer + drive);
 		non_int_flush_track (drive);

@@ -1610,6 +1617,7 @@ static int floppy_release(struct gendisk *disk, fmode_t mode)
 /* the mod_use counter is handled this way */
 	floppy_off (drive | 0x40000000);
 #endif
+	unlock_kernel();
 	return 0;
 }
 

index 035cefe..1fad4e4 100644
@@ -124,13 +124,16 @@ aoeblk_open(struct block_device *bdev, fmode_t mode)
 	struct aoedev *d = bdev->bd_disk->private_data;
 	ulong flags;
 
+	lock_kernel();
 	spin_lock_irqsave(&d->lock, flags);
 	if (d->flags & DEVFL_UP) {
 		d->nopen++;
 		spin_unlock_irqrestore(&d->lock, flags);
+		unlock_kernel();
 		return 0;
 	}
 	spin_unlock_irqrestore(&d->lock, flags);
+	unlock_kernel();
 	return -ENODEV;
 }
 

index 09ae46f..f3eb6d9 100644
@@ -1850,22 +1850,34 @@ static int floppy_open(struct block_device *bdev, fmode_t mode)
 	return 0;
 }
 
+static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
+{
+	int ret;
+
+	lock_kernel();
+	ret = floppy_open(bdev, mode);
+	unlock_kernel();
+
+	return ret;
+}
 
 static int floppy_release(struct gendisk *disk, fmode_t mode)
 {
 	struct atari_floppy_struct *p = disk->private_data;
+	lock_kernel();
 	if (p->ref < 0)
 		p->ref = 0;
 	else if (!p->ref--) {
 		printk(KERN_ERR "floppy_release with fd_ref == 0");
 		p->ref = 0;
 	}
+	unlock_kernel();
 	return 0;
 }
 
 static const struct block_device_operations floppy_fops = {
 	.owner		= THIS_MODULE,
-	.open		= floppy_open,
+	.open		= floppy_unlocked_open,
 	.release	= floppy_release,
 	.ioctl		= fd_unlocked_ioctl,
 	.media_changed	= check_floppy_change,

index 6c3c8c4..5142d87 100644
@@ -168,7 +168,7 @@ static LIST_HEAD(scan_q);
 
 static void do_cciss_request(struct request_queue *q);
 static irqreturn_t do_cciss_intr(int irq, void *dev_id);
-static int cciss_open(struct block_device *bdev, fmode_t mode);
+static int cciss_unlocked_open(struct block_device *bdev, fmode_t mode);
 static int cciss_release(struct gendisk *disk, fmode_t mode);
 static int do_ioctl(struct block_device *bdev, fmode_t mode,
 		    unsigned int cmd, unsigned long arg);

@@ -223,7 +223,7 @@ static int cciss_compat_ioctl(struct block_device *, fmode_t,
 
 static const struct block_device_operations cciss_fops = {
 	.owner = THIS_MODULE,
-	.open = cciss_open,
+	.open = cciss_unlocked_open,
 	.release = cciss_release,
 	.ioctl = do_ioctl,
 	.getgeo = cciss_getgeo,

@@ -1006,13 +1006,28 @@ static int cciss_open(struct block_device *bdev, fmode_t mode)
 	return 0;
 }
 
+static int cciss_unlocked_open(struct block_device *bdev, fmode_t mode)
+{
+	int ret;
+
+	lock_kernel();
+	ret = cciss_open(bdev, mode);
+	unlock_kernel();
+
+	return ret;
+}
+
 /*
  * Close.  Sync first.
  */
 static int cciss_release(struct gendisk *disk, fmode_t mode)
 {
-	ctlr_info_t *host = get_host(disk);
-	drive_info_struct *drv = get_drv(disk);
+	ctlr_info_t *host;
+	drive_info_struct *drv;
+
+	lock_kernel();
+	host = get_host(disk);
+	drv = get_drv(disk);
 
 #ifdef CCISS_DEBUG
 	printk(KERN_DEBUG "cciss_release %s\n", disk->disk_name);

@@ -1020,6 +1035,7 @@ static int cciss_release(struct gendisk *disk, fmode_t mode)
 
 	drv->usage_count--;
 	host->usage_count--;
+	unlock_kernel();
 	return 0;
 }
 

index 072e57c..a0fad65 100644
@@ -158,7 +158,7 @@ static int sendcmd(
 	unsigned int blkcnt,
 	unsigned int log_unit );
 
-static int ida_open(struct block_device *bdev, fmode_t mode);
+static int ida_unlocked_open(struct block_device *bdev, fmode_t mode);
 static int ida_release(struct gendisk *disk, fmode_t mode);
 static int ida_unlocked_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg);
 static int ida_getgeo(struct block_device *bdev, struct hd_geometry *geo);

@@ -196,7 +196,7 @@ static inline ctlr_info_t *get_host(struct gendisk *disk)
 
 static const struct block_device_operations ida_fops  = {
 	.owner		= THIS_MODULE,
-	.open		= ida_open,
+	.open		= ida_unlocked_open,
 	.release	= ida_release,
 	.ioctl		= ida_unlocked_ioctl,
 	.getgeo		= ida_getgeo,

@@ -841,13 +841,29 @@ static int ida_open(struct block_device *bdev, fmode_t mode)
 	return 0;
 }
 
+static int ida_unlocked_open(struct block_device *bdev, fmode_t mode)
+{
+	int ret;
+
+	lock_kernel();
+	ret = ida_open(bdev, mode);
+	unlock_kernel();
+
+	return ret;
+}
+
 /*
  * Close.  Sync first.
  */
 static int ida_release(struct gendisk *disk, fmode_t mode)
 {
-	ctlr_info_t *host = get_host(disk);
+	ctlr_info_t *host;
+
+	lock_kernel();
+	host = get_host(disk);
 	host->usage_count--;
+	unlock_kernel();
+
 	return 0;
 }
 

index be2d2da..b46db3b 100644
@@ -2619,6 +2619,7 @@ static int drbd_open(struct block_device *bdev, fmode_t mode)
 	unsigned long flags;
 	int rv = 0;
 
+	lock_kernel();
 	spin_lock_irqsave(&mdev->req_lock, flags);
 	/* to have a stable mdev->state.role
 	 * and no race with updating open_cnt */

@@ -2633,6 +2634,7 @@ static int drbd_open(struct block_device *bdev, fmode_t mode)
 	if (!rv)
 		mdev->open_cnt++;
 	spin_unlock_irqrestore(&mdev->req_lock, flags);
+	unlock_kernel();
 
 	return rv;
 }

@@ -2640,7 +2642,9 @@ static int drbd_open(struct block_device *bdev, fmode_t mode)
 static int drbd_release(struct gendisk *gd, fmode_t mode)
 {
 	struct drbd_conf *mdev = gd->private_data;
+	lock_kernel();
 	mdev->open_cnt--;
+	unlock_kernel();
 	return 0;
 }
 

index c61df47..73f1fd9 100644
@@ -3662,6 +3662,7 @@ static int floppy_release(struct gendisk *disk, fmode_t mode)
 {
 	int drive = (long)disk->private_data;
 
+	lock_kernel();
 	mutex_lock(&open_lock);
 	if (UDRS->fd_ref < 0)
 		UDRS->fd_ref = 0;

@@ -3672,6 +3673,7 @@ static int floppy_release(struct gendisk *disk, fmode_t mode)
 	if (!UDRS->fd_ref)
 		opened_bdev[drive] = NULL;
 	mutex_unlock(&open_lock);
+	unlock_kernel();
 
 	return 0;
 }

@@ -3689,6 +3691,7 @@ static int floppy_open(struct block_device *bdev, fmode_t mode)
 	int res = -EBUSY;
 	char *tmp;
 
+	lock_kernel();
 	mutex_lock(&open_lock);
 	old_dev = UDRS->fd_device;
 	if (opened_bdev[drive] && opened_bdev[drive] != bdev)

@@ -3765,6 +3768,7 @@ static int floppy_open(struct block_device *bdev, fmode_t mode)
 			goto out;
 	}
 	mutex_unlock(&open_lock);
+	unlock_kernel();
 	return 0;
 out:
 	if (UDRS->fd_ref < 0)

@@ -3775,6 +3779,7 @@ out:
 		opened_bdev[drive] = NULL;
 out2:
 	mutex_unlock(&open_lock);
+	unlock_kernel();
 	return res;
 }
 

index 6120922..b9f5026 100644
@@ -67,6 +67,7 @@
 #include <linux/compat.h>
 #include <linux/suspend.h>
 #include <linux/freezer.h>
+#include <linux/smp_lock.h>
 #include <linux/writeback.h>
 #include <linux/buffer_head.h>		/* for invalidate_bdev() */
 #include <linux/completion.h>

@@ -1408,9 +1409,11 @@ static int lo_open(struct block_device *bdev, fmode_t mode)
 {
 	struct loop_device *lo = bdev->bd_disk->private_data;
 
+	lock_kernel();
 	mutex_lock(&lo->lo_ctl_mutex);
 	lo->lo_refcnt++;
 	mutex_unlock(&lo->lo_ctl_mutex);
+	unlock_kernel();
 
 	return 0;
 }

@@ -1420,6 +1423,7 @@ static int lo_release(struct gendisk *disk, fmode_t mode)
 	struct loop_device *lo = disk->private_data;
 	int err;
 
+	lock_kernel();
 	mutex_lock(&lo->lo_ctl_mutex);
 
 	if (--lo->lo_refcnt)

@@ -1444,6 +1448,7 @@ static int lo_release(struct gendisk *disk, fmode_t mode)
 out:
 	mutex_unlock(&lo->lo_ctl_mutex);
 out_unlocked:
+	lock_kernel();
 	return 0;
 }
 

index daba7a6..76f8565 100644
@@ -225,13 +225,21 @@ static char *pcd_buf;		/* buffer for request in progress */
 static int pcd_block_open(struct block_device *bdev, fmode_t mode)
 {
 	struct pcd_unit *cd = bdev->bd_disk->private_data;
-	return cdrom_open(&cd->info, bdev, mode);
+	int ret;
+
+	lock_kernel();
+	ret = cdrom_open(&cd->info, bdev, mode);
+	unlock_kernel();
+
+	return ret;
 }
 
 static int pcd_block_release(struct gendisk *disk, fmode_t mode)
 {
 	struct pcd_unit *cd = disk->private_data;
+	lock_kernel();
 	cdrom_release(&cd->info, mode);
+	unlock_kernel();
 	return 0;
 }
 

index b22943a..ad8d3a8 100644
@@ -736,12 +736,14 @@ static int pd_open(struct block_device *bdev, fmode_t mode)
 {
 	struct pd_unit *disk = bdev->bd_disk->private_data;
 
+	lock_kernel();
 	disk->access++;
 
 	if (disk->removable) {
 		pd_special_command(disk, pd_media_check);
 		pd_special_command(disk, pd_door_lock);
 	}
+	unlock_kernel();
 	return 0;
 }
 

@@ -783,8 +785,10 @@ static int pd_release(struct gendisk *p, fmode_t mode)
 {
 	struct pd_unit *disk = p->private_data;
 
+	lock_kernel();
 	if (!--disk->access && disk->removable)
 		pd_special_command(disk, pd_door_unlock);
+	unlock_kernel();
 
 	return 0;
 }

index 38b4d56..4457b49 100644
@@ -300,20 +300,26 @@ static void __init pf_init_units(void)
 static int pf_open(struct block_device *bdev, fmode_t mode)
 {
 	struct pf_unit *pf = bdev->bd_disk->private_data;
+	int ret;
 
+	lock_kernel();
 	pf_identify(pf);
 
+	ret = -ENODEV;
 	if (pf->media_status == PF_NM)
-		return -ENODEV;
+		goto out;
 
+	ret = -EROFS;
 	if ((pf->media_status == PF_RO) && (mode & FMODE_WRITE))
-		return -EROFS;
+		goto out;
 
+	ret = 0;
 	pf->access++;
 	if (pf->removable)
 		pf_lock(pf, 1);
-
-	return 0;
+out:
+	unlock_kernel();
+	return ret;
 }
 
 static int pf_getgeo(struct block_device *bdev, struct hd_geometry *geo)

@@ -354,14 +360,18 @@ static int pf_release(struct gendisk *disk, fmode_t mode)
 {
 	struct pf_unit *pf = disk->private_data;
 
-	if (pf->access <= 0)
+	lock_kernel();
+	if (pf->access <= 0) {
+		unlock_kernel();
 		return -EINVAL;
+	}
 
 	pf->access--;
 
 	if (!pf->access && pf->removable)
 		pf_lock(pf, 0);
 
+	unlock_kernel();
 	return 0;
 
 }

index 1f70aec..4f2e12f 100644
@@ -2383,6 +2383,7 @@ static int pkt_open(struct block_device *bdev, fmode_t mode)
 
 	VPRINTK(DRIVER_NAME": entering open\n");
 
+	lock_kernel();
 	mutex_lock(&ctl_mutex);
 	pd = pkt_find_dev_from_minor(MINOR(bdev->bd_dev));
 	if (!pd) {

@@ -2410,6 +2411,7 @@ static int pkt_open(struct block_device *bdev, fmode_t mode)
 	}
 
 	mutex_unlock(&ctl_mutex);
+	unlock_kernel();
 	return 0;
 
 out_dec:

@@ -2417,6 +2419,7 @@ out_dec:
 out:
 	VPRINTK(DRIVER_NAME": failed open (%d)\n", ret);
 	mutex_unlock(&ctl_mutex);
+	unlock_kernel();
 	return ret;
 }
 

@@ -2425,6 +2428,7 @@ static int pkt_close(struct gendisk *disk, fmode_t mode)
 	struct pktcdvd_device *pd = disk->private_data;
 	int ret = 0;
 
+	lock_kernel();
 	mutex_lock(&ctl_mutex);
 	pd->refcnt--;
 	BUG_ON(pd->refcnt < 0);

@@ -2433,6 +2437,7 @@ static int pkt_close(struct gendisk *disk, fmode_t mode)
 		pkt_release_dev(pd, flush);
 	}
 	mutex_unlock(&ctl_mutex);
+	unlock_kernel();
 	return ret;
 }
 

index f04f74e..2e46815 100644
@@ -662,11 +662,23 @@ out:
 	return err;
 }
 
+static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
+{
+	int ret;
+
+	lock_kernel();
+	ret = floppy_open(bdev, mode);
+	unlock_kernel();
+
+	return ret;
+}
+
 static int floppy_release(struct gendisk *disk, fmode_t mode)
 {
 	struct floppy_state *fs = disk->private_data;
 	struct swim __iomem *base = fs->swd->base;
 
+	lock_kernel();
 	if (fs->ref_count < 0)
 		fs->ref_count = 0;
 	else if (fs->ref_count > 0)

@@ -674,6 +686,7 @@ static int floppy_release(struct gendisk *disk, fmode_t mode)
 
 	if (fs->ref_count == 0)
 		swim_motor(base, OFF);
+	unlock_kernel();
 
 	return 0;
 }

@@ -754,7 +767,7 @@ static int floppy_revalidate(struct gendisk *disk)
 
 static const struct block_device_operations floppy_fops = {
 	.owner		 = THIS_MODULE,
-	.open		 = floppy_open,
+	.open		 = floppy_unlocked_open,
 	.release	 = floppy_release,
 	.ioctl		 = floppy_ioctl,
 	.getgeo		 = floppy_getgeo,

index 4a83540..8f1334e 100644
@@ -949,15 +949,28 @@ static int floppy_open(struct block_device *bdev, fmode_t mode)
 	return 0;
 }
 
+static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
+{
+	int ret;
+
+	lock_kernel();
+	ret = floppy_open(bdev, mode);
+	unlock_kernel();
+
+	return ret;
+}
+
 static int floppy_release(struct gendisk *disk, fmode_t mode)
 {
 	struct floppy_state *fs = disk->private_data;
 	struct swim3 __iomem *sw = fs->swim3;
+	lock_kernel();
 	if (fs->ref_count > 0 && --fs->ref_count == 0) {
 		swim3_action(fs, MOTOR_OFF);
 		out_8(&sw->control_bic, 0xff);
 		swim3_select(fs, RELAX);
 	}
+	unlock_kernel();
 	return 0;
 }
 

@@ -1008,7 +1021,7 @@ static int floppy_revalidate(struct gendisk *disk)
 }
 
 static const struct block_device_operations floppy_fops = {
-	.open		= floppy_open,
+	.open		= floppy_unlocked_open,
 	.release	= floppy_release,
 	.ioctl		= floppy_unlocked_ioctl,
 	.media_changed	= floppy_check_change,

index d6e14d2..6701886 100644
@@ -1711,6 +1711,18 @@ err_open:
 	return rc;
 }
 
+static int ub_bd_unlocked_open(struct block_device *bdev, fmode_t mode)
+{
+	int ret;
+
+	lock_kernel();
+	ret = ub_bd_open(bdev, mode);
+	unlock_kernel();
+
+	return ret;
+}
+
+
 /*
  */
 static int ub_bd_release(struct gendisk *disk, fmode_t mode)

@@ -1718,7 +1730,10 @@ static int ub_bd_release(struct gendisk *disk, fmode_t mode)
 	struct ub_lun *lun = disk->private_data;
 	struct ub_dev *sc = lun->udev;
 
+	lock_kernel();
 	ub_put(sc);
+	unlock_kernel();
+
 	return 0;
 }
 

@@ -1798,7 +1813,7 @@ static int ub_bd_media_changed(struct gendisk *disk)
 
 static const struct block_device_operations ub_bd_fops = {
 	.owner		= THIS_MODULE,
-	.open		= ub_bd_open,
+	.open		= ub_bd_unlocked_open,
 	.release	= ub_bd_release,
 	.ioctl		= ub_bd_ioctl,
 	.media_changed	= ub_bd_media_changed,

index 788d938..3cbc85c 100644
@@ -41,6 +41,7 @@
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/string.h>
+#include <linux/smp_lock.h>
 #include <linux/dma-mapping.h>
 #include <linux/completion.h>
 #include <linux/device.h>

@@ -175,6 +176,18 @@ static int viodasd_open(struct block_device *bdev, fmode_t mode)
 	return 0;
 }
 
+static int viodasd_unlocked_open(struct block_device *bdev, fmode_t mode)
+{
+	int ret;
+
+	lock_kernel();
+	ret = viodasd_open(bdev, mode);
+	unlock_kernel();
+
+	return ret;
+}
+
+
 /*
  * External release entry point.
  */

@@ -183,6 +196,7 @@ static int viodasd_release(struct gendisk *disk, fmode_t mode)
 	struct viodasd_device *d = disk->private_data;
 	HvLpEvent_Rc hvrc;
 
+	lock_kernel();
 	/* Send the event to OS/400.  We DON'T expect a response */
 	hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 			HvLpEvent_Type_VirtualIo,

@@ -195,6 +209,9 @@ static int viodasd_release(struct gendisk *disk, fmode_t mode)
 			0, 0, 0);
 	if (hvrc != 0)
 		pr_warning("HV close call failed %d\n", (int)hvrc);
+
+	unlock_kernel();
+
 	return 0;
 }
 

@@ -219,7 +236,7 @@ static int viodasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
  */
 static const struct block_device_operations viodasd_fops = {
 	.owner = THIS_MODULE,
-	.open = viodasd_open,
+	.open = viodasd_unlocked_open,
 	.release = viodasd_release,
 	.getgeo = viodasd_getgeo,
 };

index 96a70bb..dfb3dce 100644
@@ -41,6 +41,7 @@
 #include <linux/cdrom.h>
 #include <linux/module.h>
 #include <linux/slab.h>
+#include <linux/smp_lock.h>
 #include <linux/scatterlist.h>
 
 #include <xen/xen.h>

@@ -1019,13 +1020,18 @@ static int blkfront_is_ready(struct xenbus_device *dev)
 static int blkif_open(struct block_device *bdev, fmode_t mode)
 {
 	struct blkfront_info *info = bdev->bd_disk->private_data;
+
+	lock_kernel();
 	info->users++;
+	unlock_kernel();
+
 	return 0;
 }
 
 static int blkif_release(struct gendisk *disk, fmode_t mode)
 {
 	struct blkfront_info *info = disk->private_data;
+	lock_kernel();
 	info->users--;
 	if (info->users == 0) {
 		/* Check whether we have been instructed to close.  We will

@@ -1037,6 +1043,7 @@ static int blkif_release(struct gendisk *disk, fmode_t mode)
 		if (state == XenbusStateClosing && info->is_ready)
 			blkfront_closing(dev);
 	}
+	unlock_kernel();
 	return 0;
 }
 

index a7b83c0..8d435c9 100644
@@ -89,6 +89,7 @@
 #include <linux/delay.h>
 #include <linux/slab.h>
 #include <linux/blkdev.h>
+#include <linux/smp_lock.h>
 #include <linux/ata.h>
 #include <linux/hdreg.h>
 #include <linux/platform_device.h>

@@ -901,11 +902,14 @@ static int ace_open(struct block_device *bdev, fmode_t mode)
 
 	dev_dbg(ace->dev, "ace_open() users=%i\n", ace->users + 1);
 
+	lock_kernel();
 	spin_lock_irqsave(&ace->lock, flags);
 	ace->users++;
 	spin_unlock_irqrestore(&ace->lock, flags);
 
 	check_disk_change(bdev);
+	unlock_kernel();
+
 	return 0;
 }
 

@@ -917,6 +921,7 @@ static int ace_release(struct gendisk *disk, fmode_t mode)
 
 	dev_dbg(ace->dev, "ace_release() users=%i\n", ace->users - 1);
 
+	lock_kernel();
 	spin_lock_irqsave(&ace->lock, flags);
 	ace->users--;
 	if (ace->users == 0) {

@@ -924,6 +929,7 @@ static int ace_release(struct gendisk *disk, fmode_t mode)
 		ace_out(ace, ACE_CTRL, val & ~ACE_CTRL_LOCKREQ);
 	}
 	spin_unlock_irqrestore(&ace->lock, flags);
+	unlock_kernel();
 	return 0;
 }
 

index 9114654..d75b2bb 100644
@@ -33,6 +33,7 @@
 #include <linux/module.h>
 #include <linux/blkdev.h>
 #include <linux/bitops.h>
+#include <linux/smp_lock.h>
 #include <linux/slab.h>
 
 #include <asm/setup.h>

@@ -153,6 +154,7 @@ static int z2_open(struct block_device *bdev, fmode_t mode)
 
     device = MINOR(bdev->bd_dev);
 
+    lock_kernel();
     if ( current_device != -1 && current_device != device )
     {
 	rc = -EBUSY;

@@ -294,20 +296,25 @@ static int z2_open(struct block_device *bdev, fmode_t mode)
 	set_capacity(z2ram_gendisk, z2ram_size >> 9);
     }
 
+    unlock_kernel();
     return 0;
 
 err_out_kfree:
     kfree(z2ram_map);
 err_out:
+    unlock_kernel();
     return rc;
 }
 
 static int
 z2_release(struct gendisk *disk, fmode_t mode)
 {
-    if ( current_device == -1 )
-	return 0;     
-
+    lock_kernel();
+    if ( current_device == -1 ) {
+    	unlock_kernel();
+    	return 0;
+    }
+    unlock_kernel();
     /*
      * FIXME: unmap memory
      */

index 7d7b894..b5bacd1 100644
@@ -493,12 +493,18 @@ static struct cdrom_device_ops gdrom_ops = {
 
 static int gdrom_bdops_open(struct block_device *bdev, fmode_t mode)
 {
-	return cdrom_open(gd.cd_info, bdev, mode);
+	int ret;
+	lock_kernel();
+	ret = cdrom_open(gd.cd_info, bdev, mode);
+	unlock_kernel();
+	return ret;
 }
 
 static int gdrom_bdops_release(struct gendisk *disk, fmode_t mode)
 {
+	lock_kernel();
 	cdrom_release(gd.cd_info, mode);
+	unlock_kernel();
 	return 0;
 }
 

index 203c87c..74d7e55 100644
@@ -155,13 +155,21 @@ static const struct file_operations proc_viocd_operations = {
 static int viocd_blk_open(struct block_device *bdev, fmode_t mode)
 {
 	struct disk_info *di = bdev->bd_disk->private_data;
-	return cdrom_open(&di->viocd_info, bdev, mode);
+	int ret;
+
+	lock_kernel();
+	ret = cdrom_open(&di->viocd_info, bdev, mode);
+	unlock_kernel();
+
+	return ret;
 }
 
 static int viocd_blk_release(struct gendisk *disk, fmode_t mode)
 {
 	struct disk_info *di = disk->private_data;
+	lock_kernel();
 	cdrom_release(&di->viocd_info, mode);
+	unlock_kernel();
 	return 0;
 }
 

index 03c93ae..a7fb6ea 100644
@@ -1585,17 +1585,19 @@ static struct ide_driver ide_cdrom_driver = {
 
 static int idecd_open(struct block_device *bdev, fmode_t mode)
 {
-	struct cdrom_info *info = ide_cd_get(bdev->bd_disk);
-	int rc = -ENOMEM;
+	struct cdrom_info *info;
+	int rc = -ENXIO;
 
+	lock_kernel();
+	info = ide_cd_get(bdev->bd_disk);
 	if (!info)
-		return -ENXIO;
+		goto out;
 
 	rc = cdrom_open(&info->devinfo, bdev, mode);
-
 	if (rc < 0)
 		ide_cd_put(info);
-
+out:
+	unlock_kernel();
 	return rc;
 }
 

@@ -1603,9 +1605,11 @@ static int idecd_release(struct gendisk *disk, fmode_t mode)
 {
 	struct cdrom_info *info = ide_drv_g(disk, cdrom_info);
 
+	lock_kernel();
 	cdrom_release(&info->devinfo, mode);
 
 	ide_cd_put(info);
+	unlock_kernel();
 
 	return 0;
 }

index 883f0c9..137337a 100644
@@ -1,3 +1,4 @@
+#include <linux/smp_lock.h>
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/string.h>

@@ -237,6 +238,18 @@ out_put_idkp:
 	return ret;
 }
 
+static int ide_gd_unlocked_open(struct block_device *bdev, fmode_t mode)
+{
+	int ret;
+
+	lock_kernel();
+	ret = ide_gd_open(bdev, mode);
+	unlock_kernel();
+
+	return ret;
+}
+
+
 static int ide_gd_release(struct gendisk *disk, fmode_t mode)
 {
 	struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);

@@ -244,6 +257,7 @@ static int ide_gd_release(struct gendisk *disk, fmode_t mode)
 
 	ide_debug_log(IDE_DBG_FUNC, "enter");
 
+	lock_kernel();
 	if (idkp->openers == 1)
 		drive->disk_ops->flush(drive);
 

@@ -255,6 +269,7 @@ static int ide_gd_release(struct gendisk *disk, fmode_t mode)
 	idkp->openers--;
 
 	ide_disk_put(idkp);
+	unlock_kernel();
 
 	return 0;
 }

@@ -321,7 +336,7 @@ static int ide_gd_ioctl(struct block_device *bdev, fmode_t mode,
 
 static const struct block_device_operations ide_gd_ops = {
 	.owner			= THIS_MODULE,
-	.open			= ide_gd_open,
+	.open			= ide_gd_unlocked_open,
 	.release		= ide_gd_release,
 	.ioctl			= ide_gd_ioctl,
 	.getgeo			= ide_gd_getgeo,

index 2487916..c50061e 100644
@@ -1906,7 +1906,11 @@ static const struct file_operations idetape_fops = {
 
 static int idetape_open(struct block_device *bdev, fmode_t mode)
 {
-	struct ide_tape_obj *tape = ide_tape_get(bdev->bd_disk, false, 0);
+	struct ide_tape_obj *tape;
+
+	lock_kernel();
+	tape = ide_tape_get(bdev->bd_disk, false, 0);
+	unlock_kernel();
 
 	if (!tape)
 		return -ENXIO;

@@ -1918,7 +1922,10 @@ static int idetape_release(struct gendisk *disk, fmode_t mode)
 {
 	struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj);
 
+	lock_kernel();
 	ide_tape_put(tape);
+	unlock_kernel();
+
 	return 0;
 }
 

index d21e128..40951a2 100644
@@ -15,6 +15,7 @@
 #include <linux/blkpg.h>
 #include <linux/bio.h>
 #include <linux/buffer_head.h>
+#include <linux/smp_lock.h>
 #include <linux/mempool.h>
 #include <linux/slab.h>
 #include <linux/idr.h>

@@ -338,6 +339,7 @@ static int dm_blk_open(struct block_device *bdev, fmode_t mode)
 {
 	struct mapped_device *md;
 
+	lock_kernel();
 	spin_lock(&_minor_lock);
 
 	md = bdev->bd_disk->private_data;

@@ -355,6 +357,7 @@ static int dm_blk_open(struct block_device *bdev, fmode_t mode)
 
 out:
 	spin_unlock(&_minor_lock);
+	unlock_kernel();
 
 	return md ? 0 : -ENXIO;
 }

@@ -362,8 +365,12 @@ out:
 static int dm_blk_close(struct gendisk *disk, fmode_t mode)
 {
 	struct mapped_device *md = disk->private_data;
+
+	lock_kernel();
 	atomic_dec(&md->open_count);
 	dm_put(md);
+	unlock_kernel();
+
 	return 0;
 }
 

index 46b3a04..3e8ae77 100644
@@ -36,6 +36,7 @@
 #include <linux/blkdev.h>
 #include <linux/sysctl.h>
 #include <linux/seq_file.h>
+#include <linux/smp_lock.h>
 #include <linux/buffer_head.h> /* for invalidate_bdev */
 #include <linux/poll.h>
 #include <linux/ctype.h>

@@ -5876,6 +5877,7 @@ static int md_open(struct block_device *bdev, fmode_t mode)
 	mddev_t *mddev = mddev_find(bdev->bd_dev);
 	int err;
 
+	lock_kernel();
 	if (mddev->gendisk != bdev->bd_disk) {
 		/* we are racing with mddev_put which is discarding this
 		 * bd_disk.

@@ -5884,6 +5886,7 @@ static int md_open(struct block_device *bdev, fmode_t mode)
 		/* Wait until bdev->bd_disk is definitely gone */
 		flush_scheduled_work();
 		/* Then retry the open from the top */
+		unlock_kernel();
 		return -ERESTARTSYS;
 	}
 	BUG_ON(mddev != bdev->bd_disk->private_data);

@@ -5896,6 +5899,7 @@ static int md_open(struct block_device *bdev, fmode_t mode)
 	mutex_unlock(&mddev->open_mutex);
 
  out:
+	unlock_kernel();
 	return err;
 }
 

@@ -5904,8 +5908,10 @@ static int md_release(struct gendisk *disk, fmode_t mode)
  	mddev_t *mddev = disk->private_data;
 
 	BUG_ON(!mddev);
+	lock_kernel();
 	atomic_dec(&mddev->openers);
 	mddev_put(mddev);
+	unlock_kernel();
 
 	return 0;
 }

index 8327e24..5b1c2cf 100644
@@ -18,6 +18,7 @@
 #include <linux/kthread.h>
 #include <linux/delay.h>
 #include <linux/slab.h>
+#include <linux/smp_lock.h>
 #include <linux/memstick.h>
 
 #define DRIVER_NAME "mspro_block"

@@ -179,6 +180,7 @@ static int mspro_block_bd_open(struct block_device *bdev, fmode_t mode)
 	struct mspro_block_data *msb = disk->private_data;
 	int rc = -ENXIO;
 
+	lock_kernel();
 	mutex_lock(&mspro_block_disk_lock);
 
 	if (msb && msb->card) {

@@ -190,6 +192,7 @@ static int mspro_block_bd_open(struct block_device *bdev, fmode_t mode)
 	}
 
 	mutex_unlock(&mspro_block_disk_lock);
+	unlock_kernel();
 
 	return rc;
 }

@@ -221,7 +224,11 @@ static int mspro_block_disk_release(struct gendisk *disk)
 
 static int mspro_block_bd_release(struct gendisk *disk, fmode_t mode)
 {
-	return mspro_block_disk_release(disk);
+	int ret;
+	lock_kernel();
+	ret = mspro_block_disk_release(disk);
+	unlock_kernel();
+	return ret;
 }
 
 static int mspro_block_bd_getgeo(struct block_device *bdev,

index 1f3b080..5a9e477 100644
@@ -578,6 +578,7 @@ static int i2o_block_open(struct block_device *bdev, fmode_t mode)
 	if (!dev->i2o_dev)
 		return -ENODEV;
 
+	lock_kernel();
 	if (dev->power > 0x1f)
 		i2o_block_device_power(dev, 0x02);
 

@@ -586,6 +587,7 @@ static int i2o_block_open(struct block_device *bdev, fmode_t mode)
 	i2o_block_device_lock(dev->i2o_dev, -1);
 
 	osm_debug("Ready.\n");
+	unlock_kernel();
 
 	return 0;
 };

@@ -616,6 +618,7 @@ static int i2o_block_release(struct gendisk *disk, fmode_t mode)
 	if (!dev->i2o_dev)
 		return 0;
 
+	lock_kernel();
 	i2o_block_device_flush(dev->i2o_dev);
 
 	i2o_block_device_unlock(dev->i2o_dev, -1);

@@ -626,6 +629,7 @@ static int i2o_block_release(struct gendisk *disk, fmode_t mode)
 		operation = 0x24;
 
 	i2o_block_device_power(dev, operation);
+	unlock_kernel();
 
 	return 0;
 }

index cb9fbc8..8433cde 100644
@@ -29,6 +29,7 @@
 #include <linux/kdev_t.h>
 #include <linux/blkdev.h>
 #include <linux/mutex.h>
+#include <linux/smp_lock.h>
 #include <linux/scatterlist.h>
 #include <linux/string_helpers.h>
 

@@ -107,6 +108,7 @@ static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 	struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
 	int ret = -ENXIO;
 
+	lock_kernel();
 	if (md) {
 		if (md->usage == 2)
 			check_disk_change(bdev);

@@ -117,6 +119,7 @@ static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 			ret = -EROFS;
 		}
 	}
+	unlock_kernel();
 
 	return ret;
 }

@@ -125,7 +128,9 @@ static int mmc_blk_release(struct gendisk *disk, fmode_t mode)
 {
 	struct mmc_blk_data *md = disk->private_data;
 
+	lock_kernel();
 	mmc_blk_put(md);
+	unlock_kernel();
 	return 0;
 }
 

index 3ddc95b..7133918 100644
@@ -165,8 +165,9 @@ static int blktrans_open(struct block_device *bdev, fmode_t mode)
 	int ret;
 
 	if (!dev)
-		return -ERESTARTSYS;
+		return -ERESTARTSYS; /* FIXME: busy loop! -arnd*/
 
+	lock_kernel();
 	mutex_lock(&dev->lock);
 
 	if (!dev->mtd) {

@@ -183,6 +184,7 @@ static int blktrans_open(struct block_device *bdev, fmode_t mode)
 unlock:
 	mutex_unlock(&dev->lock);
 	blktrans_dev_put(dev);
+	unlock_kernel();
 	return ret;
 }
 

@@ -194,6 +196,7 @@ static int blktrans_release(struct gendisk *disk, fmode_t mode)
 	if (!dev)
 		return ret;
 
+	lock_kernel();
 	mutex_lock(&dev->lock);
 
 	/* Release one reference, we sure its not the last one here*/

@@ -206,6 +209,7 @@ static int blktrans_release(struct gendisk *disk, fmode_t mode)
 unlock:
 	mutex_unlock(&dev->lock);
 	blktrans_dev_put(dev);
+	unlock_kernel();
 	return ret;
 }
 

index 33975e9..ae9da0d 100644
@@ -21,6 +21,7 @@
 #include <linux/hdreg.h>
 #include <linux/async.h>
 #include <linux/mutex.h>
+#include <linux/smp_lock.h>
 
 #include <asm/ccwdev.h>
 #include <asm/ebcdic.h>

@@ -2235,6 +2236,7 @@ static int dasd_open(struct block_device *bdev, fmode_t mode)
 	if (!block)
 		return -ENODEV;
 
+	lock_kernel();
 	base = block->base;
 	atomic_inc(&block->open_count);
 	if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {

@@ -2269,12 +2271,14 @@ static int dasd_open(struct block_device *bdev, fmode_t mode)
 		goto out;
 	}
 
+	unlock_kernel();
 	return 0;
 
 out:
 	module_put(base->discipline->owner);
 unlock:
 	atomic_dec(&block->open_count);
+	unlock_kernel();
 	return rc;
 }
 

@@ -2282,8 +2286,10 @@ static int dasd_release(struct gendisk *disk, fmode_t mode)
 {
 	struct dasd_block *block = disk->private_data;
 
+	lock_kernel();
 	atomic_dec(&block->open_count);
 	module_put(block->base->discipline->owner);
+	unlock_kernel();
 	return 0;
 }
 

index 9b43ae9..2bd72aa 100644
@@ -14,6 +14,7 @@
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/blkdev.h>
+#include <linux/smp_lock.h>
 #include <linux/completion.h>
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>

@@ -775,6 +776,7 @@ dcssblk_open(struct block_device *bdev, fmode_t mode)
 	struct dcssblk_dev_info *dev_info;
 	int rc;
 
+	lock_kernel();
 	dev_info = bdev->bd_disk->private_data;
 	if (NULL == dev_info) {
 		rc = -ENODEV;

@@ -784,6 +786,7 @@ dcssblk_open(struct block_device *bdev, fmode_t mode)
 	bdev->bd_block_size = 4096;
 	rc = 0;
 out:
+	unlock_kernel();
 	return rc;
 }
 

@@ -794,6 +797,7 @@ dcssblk_release(struct gendisk *disk, fmode_t mode)
 	struct segment_info *entry;
 	int rc;
 
+	lock_kernel();
 	if (!dev_info) {
 		rc = -ENODEV;
 		goto out;

@@ -811,6 +815,7 @@ dcssblk_release(struct gendisk *disk, fmode_t mode)
 	up_write(&dcssblk_devices_sem);
 	rc = 0;
 out:
+	unlock_kernel();
 	return rc;
 }
 

index 097da8c..b7de025 100644
@@ -16,6 +16,7 @@
 #include <linux/fs.h>
 #include <linux/module.h>
 #include <linux/blkdev.h>
+#include <linux/smp_lock.h>
 #include <linux/interrupt.h>
 #include <linux/buffer_head.h>
 #include <linux/kernel.h>

@@ -361,6 +362,7 @@ tapeblock_open(struct block_device *bdev, fmode_t mode)
 	struct tape_device *	device;
 	int			rc;
 
+	lock_kernel();
 	device = tape_get_device(disk->private_data);
 
 	if (device->required_tapemarks) {

@@ -384,12 +386,14 @@ tapeblock_open(struct block_device *bdev, fmode_t mode)
 	 *       is called.
 	 */
 	tape_state_set(device, TS_BLKUSE);
+	unlock_kernel();
 	return 0;
 
 release:
 	tape_release(device);
  put_device:
 	tape_put_device(device);
+	unlock_kernel();
 	return rc;
 }
 

@@ -403,10 +407,12 @@ static int
 tapeblock_release(struct gendisk *disk, fmode_t mode)
 {
 	struct tape_device *device = disk->private_data;
-
+ 
+	lock_kernel();
 	tape_state_set(device, TS_IN_USE);
 	tape_release(device);
 	tape_put_device(device);
+	unlock_kernel();
 
 	return 0;
 }

index 858c89d..01fbfe1 100644
@@ -757,6 +757,7 @@ static int sd_open(struct block_device *bdev, fmode_t mode)
 
 	SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
 
+	lock_kernel();
 	sdev = sdkp->device;
 
 	/*

@@ -800,10 +801,12 @@ static int sd_open(struct block_device *bdev, fmode_t mode)
 			scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
 	}
 
+	unlock_kernel();
 	return 0;
 
 error_out:
 	scsi_disk_put(sdkp);
+	unlock_kernel();
 	return retval;	
 }
 

@@ -825,6 +828,7 @@ static int sd_release(struct gendisk *disk, fmode_t mode)
 
 	SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
 
+	lock_kernel();
 	if (!--sdkp->openers && sdev->removable) {
 		if (scsi_block_when_processing_errors(sdev))
 			scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);

@@ -835,6 +839,7 @@ static int sd_release(struct gendisk *disk, fmode_t mode)
 	 * XXX is followed by a "rmmod sd_mod"?
 	 */
 	scsi_disk_put(sdkp);
+	unlock_kernel();
 	return 0;
 }
 

index ad62aa8..906f8e7 100644
@@ -467,22 +467,27 @@ static int sr_prep_fn(struct request_queue *q, struct request *rq)
 
 static int sr_block_open(struct block_device *bdev, fmode_t mode)
 {
-	struct scsi_cd *cd = scsi_cd_get(bdev->bd_disk);
+	struct scsi_cd *cd;
 	int ret = -ENXIO;
 
+	lock_kernel();
+	cd = scsi_cd_get(bdev->bd_disk);
 	if (cd) {
 		ret = cdrom_open(&cd->cdi, bdev, mode);
 		if (ret)
 			scsi_cd_put(cd);
 	}
+	unlock_kernel();
 	return ret;
 }
 
 static int sr_block_release(struct gendisk *disk, fmode_t mode)
 {
 	struct scsi_cd *cd = scsi_cd(disk);
+	lock_kernel();
 	cdrom_release(&cd->cdi, mode);
 	scsi_cd_put(cd);
+	unlock_kernel();
 	return 0;
 }
 

index 61bd0be..d3947ca 100644
@@ -25,6 +25,7 @@
 #include <linux/major.h>
 #include <linux/delay.h>
 #include <linux/hdreg.h>
+#include <linux/smp_lock.h>
 #include <linux/slab.h>
 #include <scsi/scsi.h>
 #include <scsi/scsi_cmnd.h>

@@ -1324,6 +1325,7 @@ static int blkvsc_open(struct block_device *bdev, fmode_t mode)
 	DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users,
 		   blkdev->gd->disk_name);
 
+	lock_kernel();
 	spin_lock(&blkdev->lock);
 
 	if (!blkdev->users && blkdev->device_type == DVD_TYPE) {

@@ -1335,6 +1337,7 @@ static int blkvsc_open(struct block_device *bdev, fmode_t mode)
 	blkdev->users++;
 
 	spin_unlock(&blkdev->lock);
+	unlock_kernel();
 	return 0;
 }
 

@@ -1345,6 +1348,7 @@ static int blkvsc_release(struct gendisk *disk, fmode_t mode)
 	DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users,
 		   blkdev->gd->disk_name);
 
+	lock_kernel();
 	spin_lock(&blkdev->lock);
 	if (blkdev->users == 1) {
 		spin_unlock(&blkdev->lock);

@@ -1355,6 +1359,7 @@ static int blkvsc_release(struct gendisk *disk, fmode_t mode)
 	blkdev->users--;
 
 	spin_unlock(&blkdev->lock);
+	unlock_kernel();
 	return 0;
 }