From patchwork Tue Aug 4 07:11:06 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 6934481 Return-Path: X-Original-To: patchwork-linux-scsi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id EB7D09F39D for ; Tue, 4 Aug 2015 07:16:38 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id C8CEB20497 for ; Tue, 4 Aug 2015 07:16:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8DD8C205F7 for ; Tue, 4 Aug 2015 07:16:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753611AbbHDHOX (ORCPT ); Tue, 4 Aug 2015 03:14:23 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:47949 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753212AbbHDHN7 (ORCPT ); Tue, 4 Aug 2015 03:13:59 -0400 Received: from 212095007091.public.telering.at ([212.95.7.91] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZMWQA-0008MX-60; Tue, 04 Aug 2015 07:13:59 +0000 From: Christoph Hellwig To: Jens Axboe Cc: linux-scsi@vger.kernel.org, linux-nvme@lists.infradead.org, dm-devel@redhat.com, linux-api@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/6] block: cleanup blkdev_ioctl Date: Tue, 4 Aug 2015 09:11:06 +0200 Message-Id: <1438672271-11309-2-git-send-email-hch@lst.de> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1438672271-11309-1-git-send-email-hch@lst.de> References: <1438672271-11309-1-git-send-email-hch@lst.de> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org See http://www.infradead.org/rpr.html Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Spam-Status: No, score=-7.0 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Split out helpers for all non-trivial ioctls to make this function simpler, and also start passing around a pointer version of the argument, as that's what most ioctl handlers actually need. Signed-off-by: Christoph Hellwig Reviewed-by: Martin K. Petersen --- block/ioctl.c | 227 ++++++++++++++++++++++++++++++++-------------------------- 1 file changed, 127 insertions(+), 100 deletions(-) diff --git a/block/ioctl.c b/block/ioctl.c index 8061eba..df62b47 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -193,10 +193,20 @@ int blkdev_reread_part(struct block_device *bdev) } EXPORT_SYMBOL(blkdev_reread_part); -static int blk_ioctl_discard(struct block_device *bdev, uint64_t start, - uint64_t len, int secure) +static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode, + unsigned long arg, unsigned long flags) { - unsigned long flags = 0; + uint64_t range[2]; + uint64_t start, len; + + if (!(mode & FMODE_WRITE)) + return -EBADF; + + if (copy_from_user(range, (void __user *)arg, sizeof(range))) + return -EFAULT; + + start = range[0]; + len = range[1]; if (start & 511) return -EINVAL; @@ -207,14 +217,24 @@ static int blk_ioctl_discard(struct block_device *bdev, uint64_t start, if (start + len > (i_size_read(bdev->bd_inode) >> 9)) return -EINVAL; - if (secure) - flags |= BLKDEV_DISCARD_SECURE; return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags); } -static int blk_ioctl_zeroout(struct block_device *bdev, uint64_t start, - uint64_t len) +static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode, + unsigned long arg) { + uint64_t range[2]; + uint64_t start, len; + + if (!(mode & FMODE_WRITE)) + return -EBADF; + + if (copy_from_user(range, (void __user *)arg, sizeof(range))) + return -EFAULT; + + start = range[0]; + len = range[1]; + if (start & 511) return -EINVAL; if (len & 511) @@ -295,89 +315,115 @@ static inline int is_unrecognized_ioctl(int ret) ret == -ENOIOCTLCMD; } -/* - * always keep this in sync with compat_blkdev_ioctl() - */ -int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, - unsigned long arg) +static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode, + unsigned cmd, unsigned long arg) { - struct gendisk *disk = bdev->bd_disk; - struct backing_dev_info *bdi; - loff_t size; - int ret, n; - unsigned int max_sectors; + int ret; - switch(cmd) { - case BLKFLSBUF: - if (!capable(CAP_SYS_ADMIN)) - return -EACCES; - - ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); - if (!is_unrecognized_ioctl(ret)) - return ret; + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; - fsync_bdev(bdev); - invalidate_bdev(bdev); - return 0; + ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); + if (!is_unrecognized_ioctl(ret)) + return ret; - case BLKROSET: - ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); - if (!is_unrecognized_ioctl(ret)) - return ret; - if (!capable(CAP_SYS_ADMIN)) - return -EACCES; - if (get_user(n, (int __user *)(arg))) - return -EFAULT; - set_device_ro(bdev, n); - return 0; + fsync_bdev(bdev); + invalidate_bdev(bdev); + return 0; +} - case BLKDISCARD: - case BLKSECDISCARD: { - uint64_t range[2]; +static int blkdev_roset(struct block_device *bdev, fmode_t mode, + unsigned cmd, unsigned long arg) +{ + int ret, n; - if (!(mode & FMODE_WRITE)) - return -EBADF; + ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); + if (!is_unrecognized_ioctl(ret)) + return ret; + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + if (get_user(n, (int __user *)arg)) + return -EFAULT; + set_device_ro(bdev, n); + return 0; +} - if (copy_from_user(range, (void __user *)arg, sizeof(range))) - return -EFAULT; +static int blkdev_getgeo(struct block_device *bdev, + struct hd_geometry __user *argp) +{ + struct gendisk *disk = bdev->bd_disk; + struct hd_geometry geo; + int ret; - return blk_ioctl_discard(bdev, range[0], range[1], - cmd == BLKSECDISCARD); - } - case BLKZEROOUT: { - uint64_t range[2]; + if (!argp) + return -EINVAL; + if (!disk->fops->getgeo) + return -ENOTTY; + + /* + * We need to set the startsect first, the driver may + * want to override it. + */ + memset(&geo, 0, sizeof(geo)); + geo.start = get_start_sect(bdev); + ret = disk->fops->getgeo(bdev, &geo); + if (ret) + return ret; + if (copy_to_user(argp, &geo, sizeof(geo))) + return -EFAULT; + return 0; +} - if (!(mode & FMODE_WRITE)) - return -EBADF; +/* set the logical block size */ +static int blkdev_bszset(struct block_device *bdev, fmode_t mode, + int __user *argp) +{ + int ret, n; - if (copy_from_user(range, (void __user *)arg, sizeof(range))) - return -EFAULT; + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + if (!argp) + return -EINVAL; + if (get_user(n, argp)) + return -EFAULT; - return blk_ioctl_zeroout(bdev, range[0], range[1]); + if (!(mode & FMODE_EXCL)) { + bdgrab(bdev); + if (blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0) + return -EBUSY; } - case HDIO_GETGEO: { - struct hd_geometry geo; + ret = set_blocksize(bdev, n); + if (!(mode & FMODE_EXCL)) + blkdev_put(bdev, mode | FMODE_EXCL); + return ret; +} - if (!arg) - return -EINVAL; - if (!disk->fops->getgeo) - return -ENOTTY; - - /* - * We need to set the startsect first, the driver may - * want to override it. - */ - memset(&geo, 0, sizeof(geo)); - geo.start = get_start_sect(bdev); - ret = disk->fops->getgeo(bdev, &geo); - if (ret) - return ret; - if (copy_to_user((struct hd_geometry __user *)arg, &geo, - sizeof(geo))) - return -EFAULT; - return 0; - } +/* + * always keep this in sync with compat_blkdev_ioctl() + */ +int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, + unsigned long arg) +{ + struct backing_dev_info *bdi; + void __user *argp = (void __user *)arg; + loff_t size; + unsigned int max_sectors; + + switch (cmd) { + case BLKFLSBUF: + return blkdev_flushbuf(bdev, mode, cmd, arg); + case BLKROSET: + return blkdev_roset(bdev, mode, cmd, arg); + case BLKDISCARD: + return blk_ioctl_discard(bdev, mode, arg, 0); + case BLKSECDISCARD: + return blk_ioctl_discard(bdev, mode, arg, + BLKDEV_DISCARD_SECURE); + case BLKZEROOUT: + return blk_ioctl_zeroout(bdev, mode, arg); + case HDIO_GETGEO: + return blkdev_getgeo(bdev, argp); case BLKRAGET: case BLKFRAGET: if (!arg) @@ -414,28 +460,11 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE; return 0; case BLKBSZSET: - /* set the logical block size */ - if (!capable(CAP_SYS_ADMIN)) - return -EACCES; - if (!arg) - return -EINVAL; - if (get_user(n, (int __user *) arg)) - return -EFAULT; - if (!(mode & FMODE_EXCL)) { - bdgrab(bdev); - if (blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0) - return -EBUSY; - } - ret = set_blocksize(bdev, n); - if (!(mode & FMODE_EXCL)) - blkdev_put(bdev, mode | FMODE_EXCL); - return ret; + return blkdev_bszset(bdev, mode, argp); case BLKPG: - ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg); - break; + return blkpg_ioctl(bdev, argp); case BLKRRPART: - ret = blkdev_reread_part(bdev); - break; + return blkdev_reread_part(bdev); case BLKGETSIZE: size = i_size_read(bdev->bd_inode); if ((size >> 9) > ~0UL) @@ -447,11 +476,9 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, case BLKTRACESTOP: case BLKTRACESETUP: case BLKTRACETEARDOWN: - ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg); - break; + return blk_trace_ioctl(bdev, cmd, argp); default: - ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); + return __blkdev_driver_ioctl(bdev, mode, cmd, arg); } - return ret; } EXPORT_SYMBOL_GPL(blkdev_ioctl);