[PATCH] beginning of methods conversion

To keep the size of changesets sane we split the switch by drivers;
to keep the damn thing bisectable we do the following:
	1) rename the affected methods, add ones with correct
prototypes, make (few) callers handle both.  That's this changeset.
	2) for each driver convert to new methods.  *ALL* drivers
are converted in this series.
	3) kill the old (renamed) methods.

Note that it _is_ a flagday; all in-tree drivers are converted and by the
end of this series no trace of old methods remain.  The only reason why
we do that this way is to keep the damn thing bisectable and allow per-driver
debugging if anything goes wrong.

New methods:
	open(bdev, mode)
	release(disk, mode)
	ioctl(bdev, mode, cmd, arg)		/* Called without BKL */
	compat_ioctl(bdev, mode, cmd, arg)
	locked_ioctl(bdev, mode, cmd, arg)	/* Called with BKL, legacy */

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

2 files changed, 35 insertions, 17 deletions

diff --git a/block/compat_ioctl.c b/block/compat_ioctl.c
index 1e559fba7bd..576c4fd1546 100644
--- a/block/compat_ioctl.c
+++ b/block/compat_ioctl.c
@@ -708,17 +708,17 @@ static int compat_blkdev_driver_ioctl(struct inode *inode, struct file *file,
 		return -ENOIOCTLCMD;
 	}
 
-	if (disk->fops->unlocked_ioctl)
-		return disk->fops->unlocked_ioctl(file, cmd, arg);
+	if (disk->fops->__unlocked_ioctl)
+		return disk->fops->__unlocked_ioctl(file, cmd, arg);
 
-	if (disk->fops->ioctl) {
+	if (disk->fops->__ioctl) {
 		lock_kernel();
-		ret = disk->fops->ioctl(inode, file, cmd, arg);
+		ret = disk->fops->__ioctl(inode, file, cmd, arg);
 		unlock_kernel();
 		return ret;
 	}
 
-	return -ENOTTY;
+	return __blkdev_driver_ioctl(inode->i_bdev, file->f_mode, cmd, arg);
 }
 
 static int compat_blkdev_locked_ioctl(struct inode *inode, struct file *file,
@@ -805,10 +805,11 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 
 	lock_kernel();
 	ret = compat_blkdev_locked_ioctl(inode, file, bdev, cmd, arg);
-	/* FIXME: why do we assume -> compat_ioctl needs the BKL? */
-	if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
-		ret = disk->fops->compat_ioctl(file, cmd, arg);
+	if (ret == -ENOIOCTLCMD && disk->fops->__compat_ioctl)
+		ret = disk->fops->__compat_ioctl(file, cmd, arg);
 	unlock_kernel();
+	if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
+		ret = disk->fops->compat_ioctl(bdev, file->f_mode, cmd, arg);
 
 	if (ret != -ENOIOCTLCMD)
 		return ret;
diff --git a/block/ioctl.c b/block/ioctl.c
index 9a26ace6d04..01ff463bc80 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -269,17 +269,24 @@ int blkdev_driver_ioctl(struct inode *inode, struct file *file,
 			struct gendisk *disk, unsigned cmd, unsigned long arg)
 {
 	int ret;
-	if (disk->fops->unlocked_ioctl)
-		return disk->fops->unlocked_ioctl(file, cmd, arg);
+	fmode_t mode = 0;
+	if (file) {
+		mode = file->f_mode;
+		if (file->f_flags & O_NDELAY)
+			mode |= FMODE_NDELAY_NOW;
+	}
+
+	if (disk->fops->__unlocked_ioctl)
+		return disk->fops->__unlocked_ioctl(file, cmd, arg);
 
-	if (disk->fops->ioctl) {
+	if (disk->fops->__ioctl) {
 		lock_kernel();
-		ret = disk->fops->ioctl(inode, file, cmd, arg);
+		ret = disk->fops->__ioctl(inode, file, cmd, arg);
 		unlock_kernel();
 		return ret;
 	}
 
-	return -ENOTTY;
+	return __blkdev_driver_ioctl(inode->i_bdev, mode, cmd, arg);
 }
 EXPORT_SYMBOL_GPL(blkdev_driver_ioctl);
 
@@ -295,12 +302,22 @@ int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
 	fake_file.f_path.dentry = &fake_dentry;
 	fake_dentry.d_inode = bdev->bd_inode;
 
-	if (disk->fops->unlocked_ioctl)
-		return disk->fops->unlocked_ioctl(&fake_file, cmd, arg);
+	if (disk->fops->__unlocked_ioctl)
+		return disk->fops->__unlocked_ioctl(&fake_file, cmd, arg);
+
+	if (disk->fops->__ioctl) {
+		lock_kernel();
+		ret = disk->fops->__ioctl(bdev->bd_inode, &fake_file, cmd, arg);
+		unlock_kernel();
+		return ret;
+	}
+
+	if (disk->fops->ioctl)
+		return disk->fops->ioctl(bdev, mode, cmd, arg);
 
-	if (disk->fops->ioctl) {
+	if (disk->fops->locked_ioctl) {
 		lock_kernel();
-		ret = disk->fops->ioctl(bdev->bd_inode, &fake_file, cmd, arg);
+		ret = disk->fops->locked_ioctl(bdev, mode, cmd, arg);
 		unlock_kernel();
 		return ret;
 	}