From patchwork Sun Aug 11 19:51:07 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Theodore Ts'o X-Patchwork-Id: 1145366 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-ext4-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=mit.edu Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 4668kB0qlTz9sML for ; Mon, 12 Aug 2019 05:51:29 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726144AbfHKTv2 (ORCPT ); Sun, 11 Aug 2019 15:51:28 -0400 Received: from outgoing-auth-1.mit.edu ([18.9.28.11]:40204 "EHLO outgoing.mit.edu" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726053AbfHKTv2 (ORCPT ); Sun, 11 Aug 2019 15:51:28 -0400 Received: from callcc.thunk.org (199-127-56.static.fiberhub.net [199.127.56.122] (may be forged)) (authenticated bits=0) (User authenticated as tytso@ATHENA.MIT.EDU) by outgoing.mit.edu (8.14.7/8.12.4) with ESMTP id x7BJpKMm008061 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sun, 11 Aug 2019 15:51:24 -0400 Received: by callcc.thunk.org (Postfix, from userid 15806) id 2A5B84218EE; Sun, 11 Aug 2019 15:51:14 -0400 (EDT) From: "Theodore Ts'o" To: Ext4 Developers List Cc: "Theodore Ts'o" Subject: [PATCH v2 2/3] ext4: add a new ioctl EXT4_IOC_GETSTATE Date: Sun, 11 Aug 2019 15:51:07 -0400 Message-Id: <20190811195108.24308-2-tytso@mit.edu> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190811195108.24308-1-tytso@mit.edu> References: <20190811195108.24308-1-tytso@mit.edu> MIME-Version: 1.0 Sender: linux-ext4-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org The new ioctl EXT4_IOC_GETSTATE returns some of the dynamic state of an ext4 inode for debugging purposes. Signed-off-by: Theodore Ts'o --- fs/ext4/ext4.h | 11 +++++++++++ fs/ext4/ioctl.c | 17 +++++++++++++++++ 2 files changed, 28 insertions(+) diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index b22f24f1d365..ee296797bcd2 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -651,6 +651,7 @@ enum { #define EXT4_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY /* ioctl codes 19--39 are reserved for fscrypt */ #define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40) +#define EXT4_IOC_GETSTATE _IOW('f', 41, __u32) #define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR #define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR @@ -664,6 +665,16 @@ enum { #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */ #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */ +/* + * Flags returned by EXT4_IOC_GETSTATE + * + * We only expose to userspace a subset of the state flags in + * i_state_flags + */ +#define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001 +#define EXT4_STATE_FLAG_NEW 0x00000002 +#define EXT4_STATE_FLAG_NEWENTRY 0x00000004 +#define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) /* diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c index 15b1047878ab..ffb7bde4900d 100644 --- a/fs/ext4/ioctl.c +++ b/fs/ext4/ioctl.c @@ -1123,6 +1123,22 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) return 0; } + case EXT4_IOC_GETSTATE: + { + __u32 state = 0; + + if (ext4_test_inode_state(inode, EXT4_STATE_EXT_PRECACHED)) + state |= EXT4_STATE_FLAG_EXT_PRECACHED; + if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) + state |= EXT4_STATE_FLAG_NEW; + if (ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY)) + state |= EXT4_STATE_FLAG_NEWENTRY; + if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE)) + state |= EXT4_STATE_FLAG_DA_ALLOC_CLOSE; + + return put_user(state, (__u32 __user *) arg); + } + case EXT4_IOC_FSGETXATTR: { struct fsxattr fa; @@ -1242,6 +1258,7 @@ long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) case EXT4_IOC_SHUTDOWN: case FS_IOC_GETFSMAP: case EXT4_IOC_CLEAR_ES_CACHE: + case EXT4_IOC_GETSTATE: break; default: return -ENOIOCTLCMD;