From patchwork Sat Sep 8 14:28:17 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 10593103 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7515A109C for ; Sat, 8 Sep 2018 14:33:40 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 622FF2A42C for ; Sat, 8 Sep 2018 14:33:40 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 50B992A446; Sat, 8 Sep 2018 14:33:40 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1BECB2A42C for ; Sat, 8 Sep 2018 14:33:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727521AbeIHTTi (ORCPT ); Sat, 8 Sep 2018 15:19:38 -0400 Received: from mout.kundenserver.de ([212.227.126.130]:42596 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727142AbeIHTTh (ORCPT ); Sat, 8 Sep 2018 15:19:37 -0400 Received: from wuerfel.lan ([109.193.40.16]) by mrelayeu.kundenserver.de (mreue011 [212.227.15.129]) with ESMTPA (Nemesis) id 1N0WwO-1fdWRx1nbY-00wVgk; Sat, 08 Sep 2018 16:33:13 +0200 From: Arnd Bergmann To: viro@zeniv.linux.org.uk Cc: Arnd Bergmann , "David S. Miller" , Martin Schwidefsky , Heiko Carstens , Willem Riede , "James E.J. Bottomley" , "Martin K. Petersen" , =?utf-8?q?Kai_M=C3=A4kis?= =?utf-8?q?ara?= , linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org, linux-s390@vger.kernel.org, osst-users@lists.sourceforge.net, linux-scsi@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 11/11] compat_ioctl: move tape handling into drivers Date: Sat, 8 Sep 2018 16:28:17 +0200 Message-Id: <20180908142837.2819693-11-arnd@arndb.de> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180908142837.2819693-1-arnd@arndb.de> References: <20180908142837.2819693-1-arnd@arndb.de> X-Provags-ID: V03:K1:tWYI6aJE5u0DYgGogRZh9qXzsk/ogr+iisgfCpvwrGrKQPUxZj4 BOEcgnjIPPvnOf26/QG38NWXZbu6oId5Ny7DdNB3JkcO7v2iDu3VAbL3scl4rIPlCn9yyd4 +lRhVcP2JcuWDMMq+GaryBdd8UxwKn0bAduvVaOHr7FWsHhodTvfdIckVEtc7DWodRLwF5g L06miINDQYjLOxt6PW9Zg== X-UI-Out-Filterresults: notjunk:1;V01:K0:lciv7CJdXFM=:uxYgEu9WVnoU8EOLtECJFT iUlzRfEewEwXR/BLl1r65+mqAD3G/vtKJrljqjpahQIJ4JwgiWxAzR4QHu7MchB14sfYdo+h9 UwuyC0raAYVYGSg6P1MFx6rP1/DwCrYJ7E71SWJNX4Ot2XZxssAueqRxZjT1JeIn+j7BVTp63 n8o7VX+8E7zeKNh6T6Nosf6CcMarI0o1+b0E3uVsRFdcQgH3QmSEOXookG7oX7c04Yjp7bJ6j 1hx3kiL/y4KdQM+7+M0/2fGVTK2eN4fYKuZBHGnRBTimbdVv+I3fkF0qBK2L+9JNxHF0FWikT pvyFzlXa2vh3IMyV6UI4syMDeFY1aOG9UsZR/PRpwgoOxPM4AeDDEV6larYYMgdZZTuZdhG6j KCLBqvvfrxlxGbAm5TSh8RQprR09ZzNiLaLqzRDwWiQM3vHnvg3Gi9bAC8mPPzq6xK1dScN3M 0aeGeNtPWZib3xvoCqPW8ruIaHTWeK1OwEAKE/XyvBO6SRUK29F9M925ayvP94XtVqOR4xuKq a0OpVA1Uso39V9rHuwUCYIyD2U6w/w4IS8pY9mES+Lrf5plqmWTsqq2+qg327w7YTLwH6vy8X U7PMjq45LJGwnEoHSCq6IEujo66P2xEjUqqx5oVzf5ktb1720mpt5JTbMY09crdJZ5Ck+ELEC KxHmaYvIVNQqeoWUSoqJlqJebdGNGWRQRL34E0Lm2fj8lUBQEsvmEdEECr9vuCAmRFk0= Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP MTIOCPOS and MTIOCGET are incompatible between 32-bit and 64-bit user space, and traditionally have been translated in fs/compat_ioctl.c. To get rid of that translation handler, move a corresponding implementation into each of the four drivers implementing those commands. The interesting part of that is now in a new linux/mtio.h header that wraps the existing uapi/linux/mtio.h header and provides an abstraction to let drivers handle both cases easily. Signed-off-by: Arnd Bergmann --- drivers/ide/ide-tape.c | 31 ++++++++++++---- drivers/s390/char/tape_char.c | 41 ++++++++------------ drivers/scsi/osst.c | 34 ++++++++++------- drivers/scsi/st.c | 35 +++++++++++------- fs/compat_ioctl.c | 70 ----------------------------------- include/linux/mtio.h | 58 +++++++++++++++++++++++++++++ 6 files changed, 137 insertions(+), 132 deletions(-) create mode 100644 include/linux/mtio.h diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c index 34c1165226a4..137febf3658d 100644 --- a/drivers/ide/ide-tape.c +++ b/drivers/ide/ide-tape.c @@ -19,6 +19,7 @@ #define IDETAPE_VERSION "1.20" +#include #include #include #include @@ -1368,7 +1369,7 @@ static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) * ide-tape ioctls are supported on both interfaces. */ static long do_idetape_chrdev_ioctl(struct file *file, - unsigned int cmd, unsigned long arg) + unsigned int cmd, unsigned long arg, bool compat) { struct ide_tape_obj *tape = file->private_data; ide_drive_t *drive = tape->drive; @@ -1407,14 +1408,10 @@ static long do_idetape_chrdev_ioctl(struct file *file, if (tape->drv_write_prot) mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); - if (copy_to_user(argp, &mtget, sizeof(struct mtget))) - return -EFAULT; - return 0; + return put_user_mtget(argp, &mtget, compat); case MTIOCPOS: mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; - if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) - return -EFAULT; - return 0; + return put_user_mtpos(argp, &mtpos, compat); default: if (tape->chrdev_dir == IDETAPE_DIR_READ) ide_tape_discard_merge_buffer(drive, 1); @@ -1427,7 +1424,23 @@ static long idetape_chrdev_ioctl(struct file *file, { long ret; mutex_lock(&ide_tape_mutex); - ret = do_idetape_chrdev_ioctl(file, cmd, arg); + ret = do_idetape_chrdev_ioctl(file, cmd, arg, false); + mutex_unlock(&ide_tape_mutex); + return ret; +} + +static long idetape_chrdev_compat_ioctl(struct file *file, + unsigned int cmd, unsigned long arg) +{ + long ret; + + if (cmd == MTIOCPOS32) + cmd = MTIOCPOS; + else if (cmd == MTIOCGET32) + cmd = MTIOCGET; + + mutex_lock(&ide_tape_mutex); + ret = do_idetape_chrdev_ioctl(file, cmd, arg, true); mutex_unlock(&ide_tape_mutex); return ret; } @@ -1886,6 +1899,8 @@ static const struct file_operations idetape_fops = { .read = idetape_chrdev_read, .write = idetape_chrdev_write, .unlocked_ioctl = idetape_chrdev_ioctl, + .compat_ioctl = IS_ENABLED(CONFIG_COMPAT) ? + idetape_chrdev_compat_ioctl : NULL, .open = idetape_chrdev_open, .release = idetape_chrdev_release, .llseek = noop_llseek, diff --git a/drivers/s390/char/tape_char.c b/drivers/s390/char/tape_char.c index fc206c9d1c56..522ca9b836e3 100644 --- a/drivers/s390/char/tape_char.c +++ b/drivers/s390/char/tape_char.c @@ -341,14 +341,14 @@ tapechar_release(struct inode *inode, struct file *filp) */ static int __tapechar_ioctl(struct tape_device *device, - unsigned int no, unsigned long data) + unsigned int no, void __user *data, bool compat) { int rc; if (no == MTIOCTOP) { struct mtop op; - if (copy_from_user(&op, (char __user *) data, sizeof(op)) != 0) + if (copy_from_user(&op, data, sizeof(op)) != 0) return -EFAULT; if (op.mt_count < 0) return -EINVAL; @@ -392,9 +392,7 @@ __tapechar_ioctl(struct tape_device *device, if (rc < 0) return rc; pos.mt_blkno = rc; - if (copy_to_user((char __user *) data, &pos, sizeof(pos)) != 0) - return -EFAULT; - return 0; + return put_user_mtpos(data, &pos, compat); } if (no == MTIOCGET) { /* MTIOCGET: query the tape drive status. */ @@ -424,15 +422,12 @@ __tapechar_ioctl(struct tape_device *device, get.mt_blkno = rc; } - if (copy_to_user((char __user *) data, &get, sizeof(get)) != 0) - return -EFAULT; - - return 0; + return put_user_mtget(data, &get, compat); } /* Try the discipline ioctl function. */ if (device->discipline->ioctl_fn == NULL) return -EINVAL; - return device->discipline->ioctl_fn(device, no, data); + return device->discipline->ioctl_fn(device, no, (unsigned long)data); } static long @@ -445,7 +440,7 @@ tapechar_ioctl(struct file *filp, unsigned int no, unsigned long data) device = (struct tape_device *) filp->private_data; mutex_lock(&device->mutex); - rc = __tapechar_ioctl(device, no, data); + rc = __tapechar_ioctl(device, no, (void __user *)data, false); mutex_unlock(&device->mutex); return rc; } @@ -455,23 +450,17 @@ static long tapechar_compat_ioctl(struct file *filp, unsigned int no, unsigned long data) { struct tape_device *device = filp->private_data; - int rval = -ENOIOCTLCMD; - unsigned long argp; + long rc; - /* The 'arg' argument of any ioctl function may only be used for - * pointers because of the compat pointer conversion. - * Consider this when adding new ioctls. - */ - argp = (unsigned long) compat_ptr(data); - if (device->discipline->ioctl_fn) { - mutex_lock(&device->mutex); - rval = device->discipline->ioctl_fn(device, no, argp); - mutex_unlock(&device->mutex); - if (rval == -EINVAL) - rval = -ENOIOCTLCMD; - } + if (no == MTIOCPOS32) + no = MTIOCPOS; + else if (no == MTIOCGET32) + no = MTIOCGET; - return rval; + mutex_lock(&device->mutex); + rc = __tapechar_ioctl(device, no, compat_ptr(data), false); + mutex_unlock(&device->mutex); + return rc; } #endif /* CONFIG_COMPAT */ diff --git a/drivers/scsi/osst.c b/drivers/scsi/osst.c index 7a1a1edde35d..842457b9134a 100644 --- a/drivers/scsi/osst.c +++ b/drivers/scsi/osst.c @@ -33,6 +33,7 @@ static const char * osst_version = "0.99.4"; #include +#include #include #include #include @@ -4941,7 +4942,7 @@ static int os_scsi_tape_close(struct inode * inode, struct file * filp) static long osst_ioctl(struct file * file, unsigned int cmd_in, unsigned long arg) { - int i, cmd_nr, cmd_type, blk, retval = 0; + int i, cmd_nr, cmd_type, cmd_size, blk, retval = 0; struct st_modedef * STm; struct st_partstat * STps; struct osst_request * SRpnt = NULL; @@ -4978,6 +4979,7 @@ static long osst_ioctl(struct file * file, cmd_type = _IOC_TYPE(cmd_in); cmd_nr = _IOC_NR(cmd_in); + cmd_size = _IOC_SIZE(cmd_in); #if DEBUG printk(OSST_DEB_MSG "%s:D: Ioctl %d,%d in %s mode\n", name, cmd_type, cmd_nr, STp->raw?"raw":"normal"); @@ -5179,7 +5181,8 @@ static long osst_ioctl(struct file * file, if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) { struct mtget mt_status; - if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) { + if (cmd_size != sizeof(struct mtget) && + cmd_size != sizeof(struct mtget32)) { retval = (-EINVAL); goto out; } @@ -5229,21 +5232,18 @@ static long osst_ioctl(struct file * file, STp->drv_buffer != 0) mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff); - i = copy_to_user(p, &mt_status, sizeof(struct mtget)); - if (i) { - retval = (-EFAULT); - goto out; - } - - STp->recover_erreg = 0; /* Clear after read */ - retval = 0; + retval = put_user_mtget(p, &mt_status, + cmd_size == sizeof(struct mtget32)); + if (!retval) + STp->recover_erreg = 0; /* Clear after read */ goto out; } /* End of MTIOCGET */ if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) { struct mtpos mt_pos; - if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) { + if (cmd_size != sizeof(struct mtpos) && + cmd_size != sizeof(struct mtpos32)) { retval = (-EINVAL); goto out; } @@ -5256,9 +5256,7 @@ static long osst_ioctl(struct file * file, goto out; } mt_pos.mt_blkno = blk; - i = copy_to_user(p, &mt_pos, sizeof(struct mtpos)); - if (i) - retval = -EFAULT; + retval = put_user_mtpos(p, &mt_pos, cmd_size == sizeof(struct mtpos32)); goto out; } if (SRpnt) osst_release_request(SRpnt); @@ -5284,6 +5282,14 @@ static long osst_compat_ioctl(struct file * file, unsigned int cmd_in, unsigned struct osst_tape *STp = file->private_data; struct scsi_device *sdev = STp->device; int ret = -ENOIOCTLCMD; + + switch (cmd_in) { + case MTIOCTOP: + case MTIOCPOS32: + case MTIOCGET32: + return osst_ioctl(file, cmd_in, (unsigned long)compat_ptr(arg)); + } + if (sdev->host->hostt->compat_ioctl) { ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c index 307df2fa39a3..62244ce53baa 100644 --- a/drivers/scsi/st.c +++ b/drivers/scsi/st.c @@ -21,6 +21,7 @@ static const char *verstr = "20160209"; #include +#include #include #include #include @@ -3498,7 +3499,7 @@ 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) { - int i, cmd_nr, cmd_type, bt; + int i, cmd_nr, cmd_type, cmd_size, bt; int retval = 0; unsigned int blk; struct scsi_tape *STp = file->private_data; @@ -3532,6 +3533,7 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) cmd_type = _IOC_TYPE(cmd_in); cmd_nr = _IOC_NR(cmd_in); + cmd_size = _IOC_SIZE(cmd_in); if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) { struct mtop mtc; @@ -3741,7 +3743,8 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) { struct mtget mt_status; - if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) { + if (cmd_size != sizeof(struct mtget) && + cmd_size != sizeof(struct mtget32)) { retval = (-EINVAL); goto out; } @@ -3796,19 +3799,16 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) if (STp->cleaning_req) mt_status.mt_gstat |= GMT_CLN(0xffffffff); - i = copy_to_user(p, &mt_status, sizeof(struct mtget)); - if (i) { - retval = (-EFAULT); - goto out; - } + retval = put_user_mtget(p, &mt_status, + cmd_size == sizeof(struct mtget32)); STp->recover_reg = 0; /* Clear after read */ - retval = 0; goto out; } /* End of MTIOCGET */ if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) { struct mtpos mt_pos; - if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) { + if (cmd_size != sizeof(struct mtpos) && + cmd_size != sizeof(struct mtpos32)) { retval = (-EINVAL); goto out; } @@ -3817,9 +3817,8 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) goto out; } mt_pos.mt_blkno = blk; - i = copy_to_user(p, &mt_pos, sizeof(struct mtpos)); - if (i) - retval = (-EFAULT); + retval = put_user_mtpos(p, &mt_pos, + cmd_size == sizeof(struct mtpos32)); goto out; } mutex_unlock(&STp->lock); @@ -3853,14 +3852,22 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) } #ifdef CONFIG_COMPAT -static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +static long st_compat_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) { struct scsi_tape *STp = file->private_data; struct scsi_device *sdev = STp->device; int ret = -ENOIOCTLCMD; + + switch (cmd_in) { + case MTIOCTOP: + case MTIOCPOS32: + case MTIOCGET32: + return st_ioctl(file, cmd_in, (unsigned long)compat_ptr(arg)); + } + if (sdev->host->hostt->compat_ioctl) { - ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); + ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); } return ret; diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c index bb73d52f02a2..70db940aeea9 100644 --- a/fs/compat_ioctl.c +++ b/fs/compat_ioctl.c @@ -35,7 +35,6 @@ #include #include #include -#include #include #include #include @@ -265,70 +264,6 @@ static int sg_ioctl_trans(struct file *file, unsigned int cmd, return err; } -struct mtget32 { - compat_long_t mt_type; - compat_long_t mt_resid; - compat_long_t mt_dsreg; - compat_long_t mt_gstat; - compat_long_t mt_erreg; - compat_daddr_t mt_fileno; - compat_daddr_t mt_blkno; -}; -#define MTIOCGET32 _IOR('m', 2, struct mtget32) - -struct mtpos32 { - compat_long_t mt_blkno; -}; -#define MTIOCPOS32 _IOR('m', 3, struct mtpos32) - -static int mt_ioctl_trans(struct file *file, - unsigned int cmd, void __user *argp) -{ - /* NULL initialization to make gcc shut up */ - struct mtget __user *get = NULL; - struct mtget32 __user *umget32; - struct mtpos __user *pos = NULL; - struct mtpos32 __user *upos32; - unsigned long kcmd; - void *karg; - int err = 0; - - switch(cmd) { - case MTIOCPOS32: - kcmd = MTIOCPOS; - pos = compat_alloc_user_space(sizeof(*pos)); - karg = pos; - break; - default: /* MTIOCGET32 */ - kcmd = MTIOCGET; - get = compat_alloc_user_space(sizeof(*get)); - karg = get; - break; - } - if (karg == NULL) - return -EFAULT; - err = do_ioctl(file, kcmd, (unsigned long)karg); - if (err) - return err; - switch (cmd) { - case MTIOCPOS32: - upos32 = argp; - err = convert_in_user(&pos->mt_blkno, &upos32->mt_blkno); - break; - case MTIOCGET32: - umget32 = argp; - err = convert_in_user(&get->mt_type, &umget32->mt_type); - err |= convert_in_user(&get->mt_resid, &umget32->mt_resid); - err |= convert_in_user(&get->mt_dsreg, &umget32->mt_dsreg); - err |= convert_in_user(&get->mt_gstat, &umget32->mt_gstat); - err |= convert_in_user(&get->mt_erreg, &umget32->mt_erreg); - err |= convert_in_user(&get->mt_fileno, &umget32->mt_fileno); - err |= convert_in_user(&get->mt_blkno, &umget32->mt_blkno); - break; - } - return err ? -EFAULT: 0; -} - #endif /* CONFIG_BLOCK */ /* Bluetooth ioctls */ @@ -544,8 +479,6 @@ COMPATIBLE_IOCTL(SCSI_IOCTL_GET_PCI) */ COMPATIBLE_IOCTL(_IOR('p', 20, int[7])) /* RTCGET */ COMPATIBLE_IOCTL(_IOW('p', 21, int[7])) /* RTCSET */ -/* Little m */ -COMPATIBLE_IOCTL(MTIOCTOP) /* Socket level stuff */ COMPATIBLE_IOCTL(FIOQSIZE) #ifdef CONFIG_BLOCK @@ -657,9 +590,6 @@ static long do_ioctl_trans(unsigned int cmd, #ifdef CONFIG_BLOCK case SG_IO: return sg_ioctl_trans(file, cmd, argp); - case MTIOCGET32: - case MTIOCPOS32: - return mt_ioctl_trans(file, cmd, argp); #endif /* Serial */ case TIOCGSERIAL: diff --git a/include/linux/mtio.h b/include/linux/mtio.h new file mode 100644 index 000000000000..02640756a40d --- /dev/null +++ b/include/linux/mtio.h @@ -0,0 +1,58 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_MTIO_COMPAT_H +#define _LINUX_MTIO_COMPAT_H + +#include +#include + +/* + * helper functions for implementing compat ioctls on the four tape + * drivers: we define the 32-bit layout of each incompatible strucucture, + * plus a wrapper function to copy it to user space in either format. + */ + +struct mtget32 { + s32 mt_type; + s32 mt_resid; + s32 mt_dsreg; + s32 mt_gstat; + s32 mt_erreg; + s32 mt_fileno; + s32 mt_blkno; +}; +#define MTIOCGET32 _IOR('m', 2, struct mtget32) + +struct mtpos32 { + s32 mt_blkno; +}; +#define MTIOCPOS32 _IOR('m', 3, struct mtpos32) + +static inline int put_user_mtget(void __user *u, struct mtget *k, bool compat) +{ + struct mtget32 k32 = { + .mt_type = k->mt_type, + .mt_resid = k->mt_resid, + .mt_dsreg = k->mt_dsreg, + .mt_gstat = k->mt_gstat, + .mt_fileno = k->mt_fileno, + .mt_blkno = k->mt_blkno, + }; + int ret; + + if (IS_ENABLED(CONFIG_COMPAT) && compat) + ret = copy_to_user(u, &k32, sizeof(k32)); + else + ret = copy_to_user(u, k, sizeof(*k)); + + return ret ? -EFAULT : 0; +} + +static inline int put_user_mtpos(void __user *u, struct mtpos *k, bool compat) +{ + if (IS_ENABLED(CONFIG_COMPAT) && compat) + return put_user(k->mt_blkno, (u32 __user *)u); + else + return put_user(k->mt_blkno, (long __user *)u); +} + +#endif