From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:41452 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731844AbfHHI2D (ORCPT ); Thu, 8 Aug 2019 04:28:03 -0400 From: Carlos Maiolino Subject: [PATCH 4/9] fibmap: Use bmap instead of ->bmap method in ioctl_fibmap Date: Thu, 8 Aug 2019 10:27:39 +0200 Message-Id: <20190808082744.31405-5-cmaiolino@redhat.com> In-Reply-To: <20190808082744.31405-1-cmaiolino@redhat.com> References: <20190808082744.31405-1-cmaiolino@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-xfs-owner@vger.kernel.org List-ID: List-Id: xfs To: linux-fsdevel@vger.kernel.org Cc: hch@lst.de, adilger@dilger.ca, jaegeuk@kernel.org, darrick.wong@oracle.com, miklos@szeredi.hu, rpeterso@redhat.com, linux-xfs@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: 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 +++++++++++++++++++---------- 1 file changed, 19 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; } /** -- 2.20.1