Merge commit 'v2.6.39' into for-2.6.40/core

Since for-2.6.40/core was forked off the 2.6.39 devel tree, we've
had churn in the core area that makes it difficult to handle
patches for eg cfq or blk-throttle. Instead of requiring that they
be based in older versions with bugs that have been fixed later
in the rc cycle, merge in 2.6.39 final.

Also fixes up conflicts in the below files.

Conflicts:
	drivers/block/paride/pcd.c
	drivers/cdrom/viocd.c
	drivers/ide/ide-cd.c

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

1 files changed, 87 insertions, 41 deletions

diff --git a/drivers/s390/block/dasd_ioctl.c b/drivers/s390/block/dasd_ioctl.c
index 26075e95b1ba..72261e4c516d 100644
--- a/drivers/s390/block/dasd_ioctl.c
+++ b/drivers/s390/block/dasd_ioctl.c
@@ -42,16 +42,22 @@ dasd_ioctl_api_version(void __user *argp)
 static int
 dasd_ioctl_enable(struct block_device *bdev)
 {
-	struct dasd_block *block = bdev->bd_disk->private_data;
+	struct dasd_device *base;
 
 	if (!capable(CAP_SYS_ADMIN))
 		return -EACCES;
 
-	dasd_enable_device(block->base);
+	base = dasd_device_from_gendisk(bdev->bd_disk);
+	if (!base)
+		return -ENODEV;
+
+	dasd_enable_device(base);
 	/* Formatting the dasd device can change the capacity. */
 	mutex_lock(&bdev->bd_mutex);
-	i_size_write(bdev->bd_inode, (loff_t)get_capacity(block->gdp) << 9);
+	i_size_write(bdev->bd_inode,
+		     (loff_t)get_capacity(base->block->gdp) << 9);
 	mutex_unlock(&bdev->bd_mutex);
+	dasd_put_device(base);
 	return 0;
 }
 
@@ -62,11 +68,14 @@ dasd_ioctl_enable(struct block_device *bdev)
 static int
 dasd_ioctl_disable(struct block_device *bdev)
 {
-	struct dasd_block *block = bdev->bd_disk->private_data;
+	struct dasd_device *base;
 
 	if (!capable(CAP_SYS_ADMIN))
 		return -EACCES;
 
+	base = dasd_device_from_gendisk(bdev->bd_disk);
+	if (!base)
+		return -ENODEV;
 	/*
 	 * Man this is sick. We don't do a real disable but only downgrade
 	 * the device to DASD_STATE_BASIC. The reason is that dasdfmt uses
@@ -75,7 +84,7 @@ dasd_ioctl_disable(struct block_device *bdev)
 	 * using the BIODASDFMT ioctl. Therefore the correct state for the
 	 * device is DASD_STATE_BASIC that allows to do basic i/o.
 	 */
-	dasd_set_target_state(block->base, DASD_STATE_BASIC);
+	dasd_set_target_state(base, DASD_STATE_BASIC);
 	/*
 	 * Set i_size to zero, since read, write, etc. check against this
 	 * value.
@@ -83,6 +92,7 @@ dasd_ioctl_disable(struct block_device *bdev)
 	mutex_lock(&bdev->bd_mutex);
 	i_size_write(bdev->bd_inode, 0);
 	mutex_unlock(&bdev->bd_mutex);
+	dasd_put_device(base);
 	return 0;
 }
 
@@ -191,26 +201,36 @@ static int dasd_format(struct dasd_block *block, struct format_data_t *fdata)
 static int
 dasd_ioctl_format(struct block_device *bdev, void __user *argp)
 {
-	struct dasd_block *block = bdev->bd_disk->private_data;
+	struct dasd_device *base;
 	struct format_data_t fdata;
+	int rc;
 
 	if (!capable(CAP_SYS_ADMIN))
 		return -EACCES;
 	if (!argp)
 		return -EINVAL;
-
-	if (block->base->features & DASD_FEATURE_READONLY ||
-	    test_bit(DASD_FLAG_DEVICE_RO, &block->base->flags))
+	base = dasd_device_from_gendisk(bdev->bd_disk);
+	if (!base)
+		return -ENODEV;
+	if (base->features & DASD_FEATURE_READONLY ||
+	    test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
+		dasd_put_device(base);
 		return -EROFS;
-	if (copy_from_user(&fdata, argp, sizeof(struct format_data_t)))
+	}
+	if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) {
+		dasd_put_device(base);
 		return -EFAULT;
+	}
 	if (bdev != bdev->bd_contains) {
 		pr_warning("%s: The specified DASD is a partition and cannot "
 			   "be formatted\n",
-			   dev_name(&block->base->cdev->dev));
+			   dev_name(&base->cdev->dev));
+		dasd_put_device(base);
 		return -EINVAL;
 	}
-	return dasd_format(block, &fdata);
+	rc = dasd_format(base->block, &fdata);
+	dasd_put_device(base);
+	return rc;
 }
 
 #ifdef CONFIG_DASD_PROFILE
@@ -340,8 +360,8 @@ static int dasd_ioctl_information(struct dasd_block *block,
 static int
 dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp)
 {
-	struct dasd_block *block =  bdev->bd_disk->private_data;
-	int intval;
+	struct dasd_device *base;
+	int intval, rc;
 
 	if (!capable(CAP_SYS_ADMIN))
 		return -EACCES;
@@ -350,10 +370,17 @@ dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp)
 		return -EINVAL;
 	if (get_user(intval, (int __user *)argp))
 		return -EFAULT;
-	if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &block->base->flags))
+	base = dasd_device_from_gendisk(bdev->bd_disk);
+	if (!base)
+		return -ENODEV;
+	if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
+		dasd_put_device(base);
 		return -EROFS;
+	}
 	set_disk_ro(bdev->bd_disk, intval);
-	return dasd_set_feature(block->base->cdev, DASD_FEATURE_READONLY, intval);
+	rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval);
+	dasd_put_device(base);
+	return rc;
 }
 
 static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd,
@@ -372,59 +399,78 @@ static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd,
 int dasd_ioctl(struct block_device *bdev, fmode_t mode,
 	       unsigned int cmd, unsigned long arg)
 {
-	struct dasd_block *block = bdev->bd_disk->private_data;
+	struct dasd_block *block;
+	struct dasd_device *base;
 	void __user *argp;
+	int rc;
 
 	if (is_compat_task())
 		argp = compat_ptr(arg);
 	else
 		argp = (void __user *)arg;
 
-	if (!block)
-                return -ENODEV;
-
 	if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) {
 		PRINT_DEBUG("empty data ptr");
 		return -EINVAL;
 	}
 
+	base = dasd_device_from_gendisk(bdev->bd_disk);
+	if (!base)
+		return -ENODEV;
+	block = base->block;
+	rc = 0;
 	switch (cmd) {
 	case BIODASDDISABLE:
-		return dasd_ioctl_disable(bdev);
+		rc = dasd_ioctl_disable(bdev);
+		break;
 	case BIODASDENABLE:
-		return dasd_ioctl_enable(bdev);
+		rc = dasd_ioctl_enable(bdev);
+		break;
 	case BIODASDQUIESCE:
-		return dasd_ioctl_quiesce(block);
+		rc = dasd_ioctl_quiesce(block);
+		break;
 	case BIODASDRESUME:
-		return dasd_ioctl_resume(block);
+		rc = dasd_ioctl_resume(block);
+		break;
 	case BIODASDFMT:
-		return dasd_ioctl_format(bdev, argp);
+		rc = dasd_ioctl_format(bdev, argp);
+		break;
 	case BIODASDINFO:
-		return dasd_ioctl_information(block, cmd, argp);
+		rc = dasd_ioctl_information(block, cmd, argp);
+		break;
 	case BIODASDINFO2:
-		return dasd_ioctl_information(block, cmd, argp);
+		rc = dasd_ioctl_information(block, cmd, argp);
+		break;
 	case BIODASDPRRD:
-		return dasd_ioctl_read_profile(block, argp);
+		rc = dasd_ioctl_read_profile(block, argp);
+		break;
 	case BIODASDPRRST:
-		return dasd_ioctl_reset_profile(block);
+		rc = dasd_ioctl_reset_profile(block);
+		break;
 	case BLKROSET:
-		return dasd_ioctl_set_ro(bdev, argp);
+		rc = dasd_ioctl_set_ro(bdev, argp);
+		break;
 	case DASDAPIVER:
-		return dasd_ioctl_api_version(argp);
+		rc = dasd_ioctl_api_version(argp);
+		break;
 	case BIODASDCMFENABLE:
-		return enable_cmf(block->base->cdev);
+		rc = enable_cmf(base->cdev);
+		break;
 	case BIODASDCMFDISABLE:
-		return disable_cmf(block->base->cdev);
+		rc = disable_cmf(base->cdev);
+		break;
 	case BIODASDREADALLCMB:
-		return dasd_ioctl_readall_cmb(block, cmd, argp);
+		rc = dasd_ioctl_readall_cmb(block, cmd, argp);
+		break;
 	default:
 		/* if the discipline has an ioctl method try it. */
-		if (block->base->discipline->ioctl) {
-			int rval = block->base->discipline->ioctl(block, cmd, argp);
-			if (rval != -ENOIOCTLCMD)
-				return rval;
-		}
-
-		return -EINVAL;
+		if (base->discipline->ioctl) {
+			rc = base->discipline->ioctl(block, cmd, argp);
+			if (rc == -ENOIOCTLCMD)
+				rc = -EINVAL;
+		} else
+			rc = -EINVAL;
 	}
+	dasd_put_device(base);
+	return rc;
 }