From d320a9551e394cb2d842fd32d28e9805c2a18fbb Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Fri, 15 Mar 2019 17:39:44 +0100 Subject: compat_ioctl: scsi: move ioctl handling into drivers Each driver calling scsi_ioctl() gets an equivalent compat_ioctl() handler that implements the same commands by calling scsi_compat_ioctl(). The scsi_cmd_ioctl() and scsi_cmd_blk_ioctl() functions are compatible at this point, so any driver that calls those can do so for both native and compat mode, with the argument passed through compat_ptr(). With this, we can remove the entries from fs/compat_ioctl.c. The new code is larger, but should be easier to maintain and keep updated with newly added commands. Reviewed-by: Ben Hutchings Acked-by: Stefan Hajnoczi Signed-off-by: Arnd Bergmann --- drivers/scsi/st.c | 51 ++++++++++++++++++++++++++++++++------------------- 1 file changed, 32 insertions(+), 19 deletions(-) (limited to 'drivers/scsi/st.c') diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c index 9e3fff2de83e..393f3019ccac 100644 --- a/drivers/scsi/st.c +++ b/drivers/scsi/st.c @@ -3501,7 +3501,7 @@ out: /* The ioctl command */ -static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) +static long st_ioctl_common(struct file *file, unsigned int cmd_in, void __user *p) { int i, cmd_nr, cmd_type, bt; int retval = 0; @@ -3509,7 +3509,6 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) struct scsi_tape *STp = file->private_data; struct st_modedef *STm; struct st_partstat *STps; - void __user *p = (void __user *)arg; if (mutex_lock_interruptible(&STp->lock)) return -ERESTARTSYS; @@ -3824,9 +3823,19 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) } mutex_unlock(&STp->lock); switch (cmd_in) { + case SCSI_IOCTL_STOP_UNIT: + /* unload */ + retval = scsi_ioctl(STp->device, cmd_in, p); + if (!retval) { + STp->rew_at_close = 0; + STp->ready = ST_NO_TAPE; + } + return retval; + case SCSI_IOCTL_GET_IDLUN: case SCSI_IOCTL_GET_BUS_NUMBER: break; + default: if ((cmd_in == SG_IO || cmd_in == SCSI_IOCTL_SEND_COMMAND || @@ -3840,42 +3849,46 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) return i; break; } - retval = scsi_ioctl(STp->device, cmd_in, p); - if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */ - STp->rew_at_close = 0; - STp->ready = ST_NO_TAPE; - } - return retval; + return -ENOTTY; out: mutex_unlock(&STp->lock); return retval; } +static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) +{ + void __user *p = (void __user *)arg; + struct scsi_tape *STp = file->private_data; + int ret; + + ret = st_ioctl_common(file, cmd_in, p); + if (ret != -ENOTTY) + return ret; + + return scsi_ioctl(STp->device, cmd_in, p); +} + #ifdef CONFIG_COMPAT static long st_compat_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) { void __user *p = compat_ptr(arg); struct scsi_tape *STp = file->private_data; - struct scsi_device *sdev = STp->device; - int ret = -ENOIOCTLCMD; + int ret; /* argument conversion is handled using put_user_mtpos/put_user_mtget */ switch (cmd_in) { - case MTIOCTOP: - return st_ioctl(file, MTIOCTOP, (unsigned long)p); case MTIOCPOS32: - return st_ioctl(file, MTIOCPOS, (unsigned long)p); + return st_ioctl_common(file, MTIOCPOS, p); case MTIOCGET32: - return st_ioctl(file, MTIOCGET, (unsigned long)p); + return st_ioctl_common(file, MTIOCGET, p); } - if (sdev->host->hostt->compat_ioctl) { + ret = st_ioctl_common(file, cmd_in, p); + if (ret != -ENOTTY) + return ret; - ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); - - } - return ret; + return scsi_compat_ioctl(STp->device, cmd_in, p); } #endif -- cgit v1.2.3