From patchwork Wed Sep 11 13:43:10 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Carlos Maiolino X-Patchwork-Id: 11141141 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3A960184E for ; Wed, 11 Sep 2019 13:43:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2278A20863 for ; Wed, 11 Sep 2019 13:43:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728069AbfIKNn3 (ORCPT ); Wed, 11 Sep 2019 09:43:29 -0400 Received: from mx1.redhat.com ([209.132.183.28]:57826 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727302AbfIKNn3 (ORCPT ); Wed, 11 Sep 2019 09:43:29 -0400 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id CA4EB18C427A; Wed, 11 Sep 2019 13:43:28 +0000 (UTC) Received: from pegasus.maiolino.com (ovpn-204-18.brq.redhat.com [10.40.204.18]) by smtp.corp.redhat.com (Postfix) with ESMTP id 82B3510016EB; Wed, 11 Sep 2019 13:43:27 +0000 (UTC) From: Carlos Maiolino To: linux-fsdevel@vger.kernel.org Cc: hch@lst.de, adilger@dilger.ca, darrick.wong@oracle.com, linux-xfs@vger.kernel.org Subject: [PATCH 4/9] fibmap: Use bmap instead of ->bmap method in ioctl_fibmap Date: Wed, 11 Sep 2019 15:43:10 +0200 Message-Id: <20190911134315.27380-5-cmaiolino@redhat.com> In-Reply-To: <20190911134315.27380-1-cmaiolino@redhat.com> References: <20190911134315.27380-1-cmaiolino@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.6.2 (mx1.redhat.com [10.5.110.62]); Wed, 11 Sep 2019 13:43:28 +0000 (UTC) Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Now we have the possibility of proper error return in bmap, use bmap() function in ioctl_fibmap() instead of calling ->bmap method directly. Signed-off-by: Carlos Maiolino --- Changelog: V6: - Add a dummy bmap() definition so build does not break if CONFIG_BLOCK is not set Reported-by: kbuild test robot V4: - Ensure ioctl_fibmap() returns 0 in case of error returned from bmap(). Otherwise we'll be changing the user interface (which returns 0 in case of error) V3: - Rename usr_blk to ur_block V2: - Use a local sector_t variable to asign the block number instead of using direct casting. fs/ioctl.c | 29 +++++++++++++++++++---------- include/linux/fs.h | 7 +++++++ 2 files changed, 26 insertions(+), 10 deletions(-) diff --git a/fs/ioctl.c b/fs/ioctl.c index fef3a6bf7c78..6b589c873bc2 100644 --- a/fs/ioctl.c +++ b/fs/ioctl.c @@ -53,19 +53,28 @@ EXPORT_SYMBOL(vfs_ioctl); static int ioctl_fibmap(struct file *filp, int __user *p) { - struct address_space *mapping = filp->f_mapping; - int res, block; + struct inode *inode = file_inode(filp); + int error, ur_block; + sector_t block; - /* do we support this mess? */ - if (!mapping->a_ops->bmap) - return -EINVAL; if (!capable(CAP_SYS_RAWIO)) return -EPERM; - res = get_user(block, p); - if (res) - return res; - res = mapping->a_ops->bmap(mapping, block); - return put_user(res, p); + + error = get_user(ur_block, p); + if (error) + return error; + + block = ur_block; + error = bmap(inode, &block); + + if (error) + ur_block = 0; + else + ur_block = block; + + error = put_user(ur_block, p); + + return error; } /** diff --git a/include/linux/fs.h b/include/linux/fs.h index d787ceefc937..f1fbd8298ca4 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2859,9 +2859,16 @@ static inline ssize_t generic_write_sync(struct kiocb *iocb, ssize_t count) extern void emergency_sync(void); extern void emergency_remount(void); + #ifdef CONFIG_BLOCK extern int bmap(struct inode *, sector_t *); +#else +static inline int bmap(struct inode *, sector_t *) +{ + return -EINVAL; +} #endif + extern int notify_change(struct dentry *, struct iattr *, struct inode **); extern int inode_permission(struct inode *, int); extern int generic_permission(struct inode *, int);