Re: [PATCH 15/24] compat_ioctl: scsi: move ioctl handling into drivers

From: Michael S. Tsirkin
Date: Thu Dec 12 2019 - 05:26:16 EST

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In reply to: Jens Axboe: "Re: [PATCH 15/24] compat_ioctl: scsi: move ioctl handling into drivers"
Next in thread: Arnd Bergmann: "[PATCH 16/24] compat_ioctl: move sys_compat_ioctl() to ioctl.c"
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On Wed, Dec 11, 2019 at 09:42:49PM +0100, Arnd Bergmann wrote:
> 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.
>
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> ---
> drivers/block/virtio_blk.c | 3 +
> drivers/scsi/ch.c | 9 ++-
> drivers/scsi/sd.c | 50 ++++++--------
> drivers/scsi/sg.c | 44 ++++++++-----
> drivers/scsi/sr.c | 57 ++++++++++++++--
> drivers/scsi/st.c | 51 ++++++++------
> fs/compat_ioctl.c | 132 +------------------------------------
> 7 files changed, 142 insertions(+), 204 deletions(-)
>
> diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
> index 7ffd719d89de..fbbf18ac1d5d 100644
> --- a/drivers/block/virtio_blk.c
> +++ b/drivers/block/virtio_blk.c
> @@ -405,6 +405,9 @@ static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
>
> static const struct block_device_operations virtblk_fops = {
> .ioctl = virtblk_ioctl,
> +#ifdef CONFIG_COMPAT
> + .compat_ioctl = blkdev_compat_ptr_ioctl,
> +#endif
> .owner = THIS_MODULE,
> .getgeo = virtblk_getgeo,
> };

virtio part:

Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx>

> diff --git a/drivers/scsi/ch.c b/drivers/scsi/ch.c
> index 76751d6c7f0d..ed5f4a6ae270 100644
> --- a/drivers/scsi/ch.c
> +++ b/drivers/scsi/ch.c
> @@ -872,6 +872,10 @@ static long ch_ioctl_compat(struct file * file,
> unsigned int cmd, unsigned long arg)
> {
> scsi_changer *ch = file->private_data;
> + int retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd,
> + file->f_flags & O_NDELAY);
> + if (retval)
> + return retval;
>
> switch (cmd) {
> case CHIOGPARAMS:
> @@ -883,7 +887,7 @@ static long ch_ioctl_compat(struct file * file,
> case CHIOINITELEM:
> case CHIOSVOLTAG:
> /* compatible */
> - return ch_ioctl(file, cmd, arg);
> + return ch_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
> case CHIOGSTATUS32:
> {
> struct changer_element_status32 ces32;
> @@ -898,8 +902,7 @@ static long ch_ioctl_compat(struct file * file,
> return ch_gstatus(ch, ces32.ces_type, data);
> }
> default:
> - // return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
> - return -ENOIOCTLCMD;
> + return scsi_compat_ioctl(ch->device, cmd, compat_ptr(arg));
>
> }
> }
> diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
> index cea625906440..5afb0046b12a 100644
> --- a/drivers/scsi/sd.c
> +++ b/drivers/scsi/sd.c
> @@ -1465,13 +1465,12 @@ static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
> * Note: most ioctls are forward onto the block subsystem or further
> * down in the scsi subsystem.
> **/
> -static int sd_ioctl(struct block_device *bdev, fmode_t mode,
> - unsigned int cmd, unsigned long arg)
> +static int sd_ioctl_common(struct block_device *bdev, fmode_t mode,
> + unsigned int cmd, void __user *p)
> {
> struct gendisk *disk = bdev->bd_disk;
> struct scsi_disk *sdkp = scsi_disk(disk);
> struct scsi_device *sdp = sdkp->device;
> - void __user *p = (void __user *)arg;
> int error;
>
> SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
> @@ -1507,9 +1506,6 @@ static int sd_ioctl(struct block_device *bdev, fmode_t mode,
> break;
> default:
> error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
> - if (error != -ENOTTY)
> - break;
> - error = scsi_ioctl(sdp, cmd, p);
> break;
> }
> out:
> @@ -1691,39 +1687,31 @@ static void sd_rescan(struct device *dev)
> revalidate_disk(sdkp->disk);
> }
>
> +static int sd_ioctl(struct block_device *bdev, fmode_t mode,
> + unsigned int cmd, unsigned long arg)
> +{
> + void __user *p = (void __user *)arg;
> + int ret;
> +
> + ret = sd_ioctl_common(bdev, mode, cmd, p);
> + if (ret != -ENOTTY)
> + return ret;
> +
> + return scsi_ioctl(scsi_disk(bdev->bd_disk)->device, cmd, p);
> +}
>
> #ifdef CONFIG_COMPAT
> -/*
> - * This gets directly called from VFS. When the ioctl
> - * is not recognized we go back to the other translation paths.
> - */
> static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
> unsigned int cmd, unsigned long arg)
> {
> - struct gendisk *disk = bdev->bd_disk;
> - struct scsi_disk *sdkp = scsi_disk(disk);
> - struct scsi_device *sdev = sdkp->device;
> void __user *p = compat_ptr(arg);
> - int error;
> -
> - error = scsi_verify_blk_ioctl(bdev, cmd);
> - if (error < 0)
> - return error;
> + int ret;
>
> - error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
> - (mode & FMODE_NDELAY) != 0);
> - if (error)
> - return error;
> + ret = sd_ioctl_common(bdev, mode, cmd, p);
> + if (ret != -ENOTTY)
> + return ret;
>
> - if (is_sed_ioctl(cmd))
> - return sed_ioctl(sdkp->opal_dev, cmd, p);
> -
> - /*
> - * Let the static ioctl translation table take care of it.
> - */
> - if (!sdev->host->hostt->compat_ioctl)
> - return -ENOIOCTLCMD;
> - return sdev->host->hostt->compat_ioctl(sdev, cmd, p);
> + return scsi_compat_ioctl(scsi_disk(bdev->bd_disk)->device, cmd, p);
> }
> #endif
>
> diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
> index 985546aac236..08efcee7a34d 100644
> --- a/drivers/scsi/sg.c
> +++ b/drivers/scsi/sg.c
> @@ -910,19 +910,14 @@ static int put_compat_request_table(struct compat_sg_req_info __user *o,
> #endif
>
> static long
> -sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
> +sg_ioctl_common(struct file *filp, Sg_device *sdp, Sg_fd *sfp,
> + unsigned int cmd_in, void __user *p)
> {
> - void __user *p = (void __user *)arg;
> int __user *ip = p;
> int result, val, read_only;
> - Sg_device *sdp;
> - Sg_fd *sfp;
> Sg_request *srp;
> unsigned long iflags;
>
> - if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
> - return -ENXIO;
> -
> SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
> "sg_ioctl: cmd=0x%x\n", (int) cmd_in));
> read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
> @@ -1145,29 +1140,44 @@ sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
> cmd_in, filp->f_flags & O_NDELAY);
> if (result)
> return result;
> +
> + return -ENOIOCTLCMD;
> +}
> +
> +static long
> +sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
> +{
> + void __user *p = (void __user *)arg;
> + Sg_device *sdp;
> + Sg_fd *sfp;
> + int ret;
> +
> + if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
> + return -ENXIO;
> +
> + ret = sg_ioctl_common(filp, sdp, sfp, cmd_in, p);
> + if (ret != -ENOIOCTLCMD)
> + return ret;
> +
> return scsi_ioctl(sdp->device, cmd_in, p);
> }
>
> #ifdef CONFIG_COMPAT
> static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
> {
> + void __user *p = compat_ptr(arg);
> Sg_device *sdp;
> Sg_fd *sfp;
> - struct scsi_device *sdev;
> + int ret;
>
> if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
> return -ENXIO;
>
> - sdev = sdp->device;
> - if (sdev->host->hostt->compat_ioctl) {
> - int ret;
> -
> - ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
> -
> + ret = sg_ioctl_common(filp, sdp, sfp, cmd_in, p);
> + if (ret != -ENOIOCTLCMD)
> return ret;
> - }
> -
> - return -ENOIOCTLCMD;
> +
> + return scsi_compat_ioctl(sdp->device, cmd_in, p);
> }
> #endif
>
> diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
> index 4664fdf75c0f..6033a886c42c 100644
> --- a/drivers/scsi/sr.c
> +++ b/drivers/scsi/sr.c
> @@ -38,6 +38,7 @@
> #include <linux/kernel.h>
> #include <linux/mm.h>
> #include <linux/bio.h>
> +#include <linux/compat.h>
> #include <linux/string.h>
> #include <linux/errno.h>
> #include <linux/cdrom.h>
> @@ -598,6 +599,55 @@ static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
> return ret;
> }
>
> +#ifdef CONFIG_COMPAT
> +static int sr_block_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
> + unsigned long arg)
> +{
> + struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
> + struct scsi_device *sdev = cd->device;
> + void __user *argp = compat_ptr(arg);
> + int ret;
> +
> + mutex_lock(&sr_mutex);
> +
> + ret = scsi_ioctl_block_when_processing_errors(sdev, cmd,
> + (mode & FMODE_NDELAY) != 0);
> + if (ret)
> + goto out;
> +
> + scsi_autopm_get_device(sdev);
> +
> + /*
> + * Send SCSI addressing ioctls directly to mid level, send other
> + * ioctls to cdrom/block level.
> + */
> + switch (cmd) {
> + case SCSI_IOCTL_GET_IDLUN:
> + case SCSI_IOCTL_GET_BUS_NUMBER:
> + ret = scsi_compat_ioctl(sdev, cmd, argp);
> + goto put;
> + }
> +
> + /*
> + * CDROM ioctls are handled in the block layer, but
> + * do the scsi blk ioctls here.
> + */
> + ret = scsi_cmd_blk_ioctl(bdev, mode, cmd, argp);
> + if (ret != -ENOTTY)
> + return ret;
> +
> + ret = scsi_compat_ioctl(sdev, cmd, argp);
> +
> +put:
> + scsi_autopm_put_device(sdev);
> +
> +out:
> + mutex_unlock(&sr_mutex);
> + return ret;
> +
> +}
> +#endif
> +
> static unsigned int sr_block_check_events(struct gendisk *disk,
> unsigned int clearing)
> {
> @@ -641,12 +691,11 @@ static const struct block_device_operations sr_bdops =
> .open = sr_block_open,
> .release = sr_block_release,
> .ioctl = sr_block_ioctl,
> +#ifdef CONFIG_COMPAT
> + .ioctl = sr_block_compat_ioctl,
> +#endif
> .check_events = sr_block_check_events,
> .revalidate_disk = sr_block_revalidate_disk,
> - /*
> - * No compat_ioctl for now because sr_block_ioctl never
> - * seems to pass arbitrary ioctls down to host drivers.
> - */
> };
>
> static int sr_open(struct cdrom_device_info *cdi, int purpose)
> 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 @@ static int partition_tape(struct scsi_tape *STp, int size)
>
>
> /* 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
>
> diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
> index 358ea2ecf36b..ab4471f469e6 100644
> --- a/fs/compat_ioctl.c
> +++ b/fs/compat_ioctl.c
> @@ -36,109 +36,11 @@
>
> #include "internal.h"
>
> -#ifdef CONFIG_BLOCK
> -#include <linux/cdrom.h>
> -#include <linux/fd.h>
> -#include <scsi/scsi.h>
> -#include <scsi/scsi_ioctl.h>
> -#include <scsi/sg.h>
> -#endif
> -
> #include <linux/uaccess.h>
> #include <linux/watchdog.h>
>
> #include <linux/hiddev.h>
>
> -
> -#include <linux/sort.h>
> -
> -/*
> - * simple reversible transform to make our table more evenly
> - * distributed after sorting.
> - */
> -#define XFORM(i) (((i) ^ ((i) << 27) ^ ((i) << 17)) & 0xffffffff)
> -
> -#define COMPATIBLE_IOCTL(cmd) XFORM((u32)cmd),
> -static unsigned int ioctl_pointer[] = {
> -#ifdef CONFIG_BLOCK
> -/* Big S */
> -COMPATIBLE_IOCTL(SCSI_IOCTL_GET_IDLUN)
> -COMPATIBLE_IOCTL(SCSI_IOCTL_DOORLOCK)
> -COMPATIBLE_IOCTL(SCSI_IOCTL_DOORUNLOCK)
> -COMPATIBLE_IOCTL(SCSI_IOCTL_TEST_UNIT_READY)
> -COMPATIBLE_IOCTL(SCSI_IOCTL_GET_BUS_NUMBER)
> -COMPATIBLE_IOCTL(SCSI_IOCTL_SEND_COMMAND)
> -COMPATIBLE_IOCTL(SCSI_IOCTL_PROBE_HOST)
> -COMPATIBLE_IOCTL(SCSI_IOCTL_GET_PCI)
> -#endif
> -#ifdef CONFIG_BLOCK
> -/* SG stuff */
> -COMPATIBLE_IOCTL(SG_IO)
> -COMPATIBLE_IOCTL(SG_GET_REQUEST_TABLE)
> -COMPATIBLE_IOCTL(SG_SET_TIMEOUT)
> -COMPATIBLE_IOCTL(SG_GET_TIMEOUT)
> -COMPATIBLE_IOCTL(SG_EMULATED_HOST)
> -COMPATIBLE_IOCTL(SG_GET_TRANSFORM)
> -COMPATIBLE_IOCTL(SG_SET_RESERVED_SIZE)
> -COMPATIBLE_IOCTL(SG_GET_RESERVED_SIZE)
> -COMPATIBLE_IOCTL(SG_GET_SCSI_ID)
> -COMPATIBLE_IOCTL(SG_SET_FORCE_LOW_DMA)
> -COMPATIBLE_IOCTL(SG_GET_LOW_DMA)
> -COMPATIBLE_IOCTL(SG_SET_FORCE_PACK_ID)
> -COMPATIBLE_IOCTL(SG_GET_PACK_ID)
> -COMPATIBLE_IOCTL(SG_GET_NUM_WAITING)
> -COMPATIBLE_IOCTL(SG_SET_DEBUG)
> -COMPATIBLE_IOCTL(SG_GET_SG_TABLESIZE)
> -COMPATIBLE_IOCTL(SG_GET_COMMAND_Q)
> -COMPATIBLE_IOCTL(SG_SET_COMMAND_Q)
> -COMPATIBLE_IOCTL(SG_GET_VERSION_NUM)
> -COMPATIBLE_IOCTL(SG_NEXT_CMD_LEN)
> -COMPATIBLE_IOCTL(SG_SCSI_RESET)
> -COMPATIBLE_IOCTL(SG_GET_REQUEST_TABLE)
> -COMPATIBLE_IOCTL(SG_SET_KEEP_ORPHAN)
> -COMPATIBLE_IOCTL(SG_GET_KEEP_ORPHAN)
> -#endif
> -};
> -
> -/*
> - * Convert common ioctl arguments based on their command number
> - *
> - * Please do not add any code in here. Instead, implement
> - * a compat_ioctl operation in the place that handleÑ the
> - * ioctl for the native case.
> - */
> -static long do_ioctl_trans(unsigned int cmd,
> - unsigned long arg, struct file *file)
> -{
> - return -ENOIOCTLCMD;
> -}
> -
> -static int compat_ioctl_check_table(unsigned int xcmd)
> -{
> -#ifdef CONFIG_BLOCK
> - int i;
> - const int max = ARRAY_SIZE(ioctl_pointer) - 1;
> -
> - BUILD_BUG_ON(max >= (1 << 16));
> -
> - /* guess initial offset into table, assuming a
> - normalized distribution */
> - i = ((xcmd >> 16) * max) >> 16;
> -
> - /* do linear search up first, until greater or equal */
> - while (ioctl_pointer[i] < xcmd && i < max)
> - i++;
> -
> - /* then do linear search down */
> - while (ioctl_pointer[i] > xcmd && i > 0)
> - i--;
> -
> - return ioctl_pointer[i] == xcmd;
> -#else
> - return 0;
> -#endif
> -}
> -
> COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd,
> compat_ulong_t, arg32)
> {
> @@ -216,19 +118,9 @@ COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd,
> goto out_fput;
> }
>
> - if (!f.file->f_op->unlocked_ioctl)
> - goto do_ioctl;
> - break;
> - }
> -
> - if (compat_ioctl_check_table(XFORM(cmd)))
> - goto found_handler;
> -
> - error = do_ioctl_trans(cmd, arg, f.file);
> - if (error == -ENOIOCTLCMD)
> error = -ENOTTY;
> -
> - goto out_fput;
> + goto out_fput;
> + }
>
> found_handler:
> arg = (unsigned long)compat_ptr(arg);
> @@ -239,23 +131,3 @@ COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd,
> out:
> return error;
> }
> -
> -static int __init init_sys32_ioctl_cmp(const void *p, const void *q)
> -{
> - unsigned int a, b;
> - a = *(unsigned int *)p;
> - b = *(unsigned int *)q;
> - if (a > b)
> - return 1;
> - if (a < b)
> - return -1;
> - return 0;
> -}
> -
> -static int __init init_sys32_ioctl(void)
> -{
> - sort(ioctl_pointer, ARRAY_SIZE(ioctl_pointer), sizeof(*ioctl_pointer),
> - init_sys32_ioctl_cmp, NULL);
> - return 0;
> -}
> -__initcall(init_sys32_ioctl);
> --
> 2.20.0

Next message: Linus Walleij: "Re: [PATCH v6 2/2] iio: (bma400) add driver for the BMA400"
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In reply to: Jens Axboe: "Re: [PATCH 15/24] compat_ioctl: scsi: move ioctl handling into drivers"
Next in thread: Arnd Bergmann: "[PATCH 16/24] compat_ioctl: move sys_compat_ioctl() to ioctl.c"
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