[PATCH] get rid of blkdev_locked_ioctl()
Most of that stuff doesn't need BKL at all; expand in the (only) caller,
merge the switch into one there and leave BKL only around the stuff that
might actually need it.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/block/compat_ioctl.c b/block/compat_ioctl.c
index 504344d..5b3db06 100644
--- a/block/compat_ioctl.c
+++ b/block/compat_ioctl.c
@@ -688,12 +688,40 @@
return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
}
-static int compat_blkdev_locked_ioctl(struct block_device *bdev,
- unsigned cmd, unsigned long arg)
+/* Most of the generic ioctls are handled in the normal fallback path.
+ This assumes the blkdev's low level compat_ioctl always returns
+ ENOIOCTLCMD for unknown ioctls. */
+long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
{
+ int ret = -ENOIOCTLCMD;
+ struct inode *inode = file->f_mapping->host;
+ struct block_device *bdev = inode->i_bdev;
+ struct gendisk *disk = bdev->bd_disk;
+ fmode_t mode = file->f_mode;
struct backing_dev_info *bdi;
+ loff_t size;
+
+ if (file->f_flags & O_NDELAY)
+ mode |= FMODE_NDELAY_NOW;
switch (cmd) {
+ case HDIO_GETGEO:
+ return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
+ case BLKFLSBUF:
+ case BLKROSET:
+ case BLKDISCARD:
+ /*
+ * the ones below are implemented in blkdev_locked_ioctl,
+ * but we call blkdev_ioctl, which gets the lock for us
+ */
+ case BLKRRPART:
+ return blkdev_ioctl(inode, file, cmd,
+ (unsigned long)compat_ptr(arg));
+ case BLKBSZSET_32:
+ return blkdev_ioctl(inode, file, BLKBSZSET,
+ (unsigned long)compat_ptr(arg));
+ case BLKPG:
+ return compat_blkpg_ioctl(inode, file, cmd, compat_ptr(arg));
case BLKRAGET:
case BLKFRAGET:
if (!arg)
@@ -719,67 +747,36 @@
bdi = blk_get_backing_dev_info(bdev);
if (bdi == NULL)
return -ENOTTY;
+ lock_kernel();
bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
+ unlock_kernel();
return 0;
case BLKGETSIZE:
- if ((bdev->bd_inode->i_size >> 9) > ~0UL)
+ size = bdev->bd_inode->i_size;
+ if ((size >> 9) > ~0UL)
return -EFBIG;
- return compat_put_ulong(arg, bdev->bd_inode->i_size >> 9);
+ return compat_put_ulong(arg, size >> 9);
case BLKGETSIZE64_32:
return compat_put_u64(arg, bdev->bd_inode->i_size);
case BLKTRACESETUP32:
- return compat_blk_trace_setup(bdev, compat_ptr(arg));
+ lock_kernel();
+ ret = compat_blk_trace_setup(bdev, compat_ptr(arg));
+ unlock_kernel();
+ return ret;
case BLKTRACESTART: /* compatible */
case BLKTRACESTOP: /* compatible */
case BLKTRACETEARDOWN: /* compatible */
- return blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
- }
- return -ENOIOCTLCMD;
-}
-
-/* Most of the generic ioctls are handled in the normal fallback path.
- This assumes the blkdev's low level compat_ioctl always returns
- ENOIOCTLCMD for unknown ioctls. */
-long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
-{
- int ret = -ENOIOCTLCMD;
- struct inode *inode = file->f_mapping->host;
- struct block_device *bdev = inode->i_bdev;
- struct gendisk *disk = bdev->bd_disk;
- fmode_t mode = file->f_mode;
- if (file->f_flags & O_NDELAY)
- mode |= FMODE_NDELAY_NOW;
-
- switch (cmd) {
- case HDIO_GETGEO:
- return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
- case BLKFLSBUF:
- case BLKROSET:
- case BLKDISCARD:
- /*
- * the ones below are implemented in blkdev_locked_ioctl,
- * but we call blkdev_ioctl, which gets the lock for us
- */
- case BLKRRPART:
- return blkdev_ioctl(inode, file, cmd,
- (unsigned long)compat_ptr(arg));
- case BLKBSZSET_32:
- return blkdev_ioctl(inode, file, BLKBSZSET,
- (unsigned long)compat_ptr(arg));
- case BLKPG:
- return compat_blkpg_ioctl(inode, file, cmd, compat_ptr(arg));
- }
-
- lock_kernel();
- ret = compat_blkdev_locked_ioctl(bdev, cmd, arg);
- unlock_kernel();
- if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
- ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
-
- if (ret != -ENOIOCTLCMD)
+ lock_kernel();
+ ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
+ unlock_kernel();
return ret;
-
- return compat_blkdev_driver_ioctl(bdev, mode, cmd, arg);
+ default:
+ if (disk->fops->compat_ioctl)
+ ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
+ if (ret == -ENOIOCTLCMD)
+ ret = compat_blkdev_driver_ioctl(bdev, mode, cmd, arg);
+ return ret;
+ }
}