From patchwork Thu Nov 8 13:01:10 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Kara X-Patchwork-Id: 10674137 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 50C7D17D4 for ; Thu, 8 Nov 2018 13:01:23 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 404932D2B7 for ; Thu, 8 Nov 2018 13:01:23 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 34F022D3EF; Thu, 8 Nov 2018 13:01:23 +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 D6AF42D3E5 for ; Thu, 8 Nov 2018 13:01:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726996AbeKHWgp (ORCPT ); Thu, 8 Nov 2018 17:36:45 -0500 Received: from mx2.suse.de ([195.135.220.15]:34052 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726927AbeKHWgp (ORCPT ); Thu, 8 Nov 2018 17:36:45 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 11491B083; Thu, 8 Nov 2018 13:01:18 +0000 (UTC) Received: by quack2.suse.cz (Postfix, from userid 1000) id 36C071E09B3; Thu, 8 Nov 2018 14:01:18 +0100 (CET) From: Jan Kara To: Jens Axboe Cc: , Tetsuo Handa , Jan Kara Subject: [PATCH 10/16] loop: Push loop_ctl_mutex down to loop_set_fd() Date: Thu, 8 Nov 2018 14:01:10 +0100 Message-Id: <20181108130116.12140-11-jack@suse.cz> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20181108130116.12140-1-jack@suse.cz> References: <20181108130116.12140-1-jack@suse.cz> Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Push lo_ctl_mutex down to loop_set_fd(). We will need this to be able to call loop_reread_partitions() without lo_ctl_mutex. Signed-off-by: Jan Kara --- drivers/block/loop.c | 26 ++++++++++++++------------ 1 file changed, 14 insertions(+), 12 deletions(-) diff --git a/drivers/block/loop.c b/drivers/block/loop.c index af79a59732b7..161e2a08f2e8 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -918,13 +918,17 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode, if (!file) goto out; + error = mutex_lock_killable_nested(&loop_ctl_mutex, 1); + if (error) + goto out_putf; + error = -EBUSY; if (lo->lo_state != Lo_unbound) - goto out_putf; + goto out_unlock; error = loop_validate_file(file, bdev); if (error) - goto out_putf; + goto out_unlock; mapping = file->f_mapping; inode = mapping->host; @@ -936,10 +940,10 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode, error = -EFBIG; size = get_loop_size(lo, file); if ((loff_t)(sector_t)size != size) - goto out_putf; + goto out_unlock; error = loop_prepare_queue(lo); if (error) - goto out_putf; + goto out_unlock; error = 0; @@ -978,11 +982,14 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode, * put /dev/loopXX inode. Later in __loop_clr_fd() we bdput(bdev). */ bdgrab(bdev); + mutex_unlock(&loop_ctl_mutex); return 0; - out_putf: +out_unlock: + mutex_unlock(&loop_ctl_mutex); +out_putf: fput(file); - out: +out: /* This is safe: open() is still holding a reference. */ module_put(THIS_MODULE); return error; @@ -1460,12 +1467,7 @@ static int lo_ioctl(struct block_device *bdev, fmode_t mode, switch (cmd) { case LOOP_SET_FD: - err = mutex_lock_killable_nested(&loop_ctl_mutex, 1); - if (err) - return err; - err = loop_set_fd(lo, mode, bdev, arg); - mutex_unlock(&loop_ctl_mutex); - break; + return loop_set_fd(lo, mode, bdev, arg); case LOOP_CHANGE_FD: err = mutex_lock_killable_nested(&loop_ctl_mutex, 1); if (err)