From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:58802 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1762927Ab3DDQcc (ORCPT ); Thu, 4 Apr 2013 12:32:32 -0400 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r34GWWXL020883 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Thu, 4 Apr 2013 12:32:32 -0400 Message-ID: <515DAB1F.2050308@redhat.com> Date: Thu, 04 Apr 2013 11:32:31 -0500 From: Eric Sandeen MIME-Version: 1.0 To: linux-btrfs , Jan Safranek Subject: [PATCH V2] btrfs: close any open devices if btrfs_mount fails References: <515D9DDE.5040306@redhat.com> In-Reply-To: <515D9DDE.5040306@redhat.com> Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-btrfs-owner@vger.kernel.org List-ID: This: # mkfs.btrfs /dev/sdb{1,2} ; wipefs -a /dev/sdb1; mount /dev/sdb2 /mnt/test would lead to a blkdev open/close mismatch when the mount fails, and a permanently busy (opened O_EXCL) sdb2: # wipefs -a /dev/sdb2 wipefs: error: /dev/sdb2: probing initialization failed: Device or resource busy It's because btrfs_open_devices() may open some devices, and still return failure. So the error unwinding needs to close any open devices in fs_devices before returning. Reported-by: Jan Safranek Signed-off-by: Eric Sandeen --- V2: use open_devices not opened, that seems like the right test... if a test is necessary I'm not certain, tbh. Seems prudently defensive. Note, __btrfs_open_devices is weird; it seems to return success or failure based on the outcome of the result of the last call to btrfs_get_bdev_and_sb(). But that's a different bug... diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index f6b8859..60c67fa 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -1125,7 +1125,7 @@ static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, error = btrfs_open_devices(fs_devices, mode, fs_type); if (error) - goto error_fs_info; + goto error_close_devices; if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { error = -EACCES; @@ -1161,7 +1161,8 @@ static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, return root; error_close_devices: - btrfs_close_devices(fs_devices); + if (fs_devices->open_devices) + btrfs_close_devices(fs_devices); error_fs_info: free_fs_info(fs_info); return ERR_PTR(error); -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html