diff options
Diffstat (limited to 'block/ioctl.c')
| -rw-r--r-- | block/ioctl.c | 28 |
1 files changed, 23 insertions, 5 deletions
diff --git a/block/ioctl.c b/block/ioctl.c index ca939fc1030..4828fa34981 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -5,7 +5,7 @@ #include <linux/blkpg.h> #include <linux/hdreg.h> #include <linux/backing-dev.h> -#include <linux/buffer_head.h> +#include <linux/fs.h> #include <linux/blktrace_api.h> #include <asm/uaccess.h> @@ -180,6 +180,26 @@ int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode, EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl); /* + * Is it an unrecognized ioctl? The correct returns are either + * ENOTTY (final) or ENOIOCTLCMD ("I don't know this one, try a + * fallback"). ENOIOCTLCMD gets turned into ENOTTY by the ioctl + * code before returning. + * + * Confused drivers sometimes return EINVAL, which is wrong. It + * means "I understood the ioctl command, but the parameters to + * it were wrong". + * + * We should aim to just fix the broken drivers, the EINVAL case + * should go away. + */ +static inline int is_unrecognized_ioctl(int ret) +{ + return ret == -EINVAL || + ret == -ENOTTY || + ret == -ENOIOCTLCMD; +} + +/* * always keep this in sync with compat_blkdev_ioctl() */ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, @@ -196,8 +216,7 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, return -EACCES; ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); - /* -EINVAL to handle old uncorrected drivers */ - if (ret != -EINVAL && ret != -ENOTTY) + if (!is_unrecognized_ioctl(ret)) return ret; fsync_bdev(bdev); @@ -206,8 +225,7 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, case BLKROSET: ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); - /* -EINVAL to handle old uncorrected drivers */ - if (ret != -EINVAL && ret != -ENOTTY) + if (!is_unrecognized_ioctl(ret)) return ret; if (!capable(CAP_SYS_ADMIN)) return -EACCES; |