From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from userp1040.oracle.com ([156.151.31.81]:39548 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750784AbdFOJOk (ORCPT ); Thu, 15 Jun 2017 05:14:40 -0400 From: Anand Jain To: linux-btrfs@vger.kernel.org Cc: dsterba@suse.cz Subject: [PATCH v2] btrfs: add mount umount logs Date: Thu, 15 Jun 2017 17:20:42 +0800 Message-Id: <1497518442-1078-1-git-send-email-anand.jain@oracle.com> Sender: linux-btrfs-owner@vger.kernel.org List-ID: From: Anand Jain By looking at the logs we should be able to know when FS was mounted and unmounted and the options used, so to help forensic investigations. Signed-off-by: Anand Jain --- Hi David, As you suggested VFS is definitly a better place to have this and its patch is in the ML. But I am not too sure what's their plan is. So can we integrate this into BTRFS ? as we can always remove it once VFS provides that feature. Thanks, Anand v2: Use ro,rw instead of rdonly and directly print it. fs/btrfs/super.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 3371213924bd..2cb367a106e3 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -1373,6 +1373,13 @@ static char *setup_root_args(char *args) return buf; } +static void print_mount_info(struct btrfs_fs_info *info, int flag, char *opt, + char *prefix) +{ + btrfs_notice(info, "%s: flags=%s opt=%s\n", + prefix, flag & MS_RDONLY ? "ro":"rw", opt); +} + static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid, int flags, const char *device_name, char *data) @@ -1467,6 +1474,8 @@ static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid, dput(root); root = ERR_PTR(ret); deactivate_locked_super(s); + } else { + print_mount_info(fs_info, flags, data, "mount"); } } @@ -1845,6 +1854,9 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data) out: wake_up_process(fs_info->transaction_kthread); btrfs_remount_cleanup(fs_info, old_opts); + + print_mount_info(fs_info, *flags, data, "remount"); + return 0; restore: @@ -2174,6 +2186,7 @@ static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) static void btrfs_kill_super(struct super_block *sb) { struct btrfs_fs_info *fs_info = btrfs_sb(sb); + btrfs_notice(fs_info, "%s\n", "unmount"); kill_anon_super(sb); free_fs_info(fs_info); } -- 2.7.0