From patchwork Fri Aug 5 18:35:40 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 12937635 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4476BC25B07 for ; Fri, 5 Aug 2022 18:35:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241477AbiHESfw (ORCPT ); Fri, 5 Aug 2022 14:35:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38740 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241438AbiHESfu (ORCPT ); Fri, 5 Aug 2022 14:35:50 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EE396765E; Fri, 5 Aug 2022 11:35:49 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 93E28B829F2; Fri, 5 Aug 2022 18:35:48 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 58042C433C1; Fri, 5 Aug 2022 18:35:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1659724547; bh=rTxZdWYcyUDsw35HfXDcwe1teGLqBNlOzMdnw0TScoQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=X0JzmwCxMunXMqz2W2d286b6qohBaha2Iuo9HihcbgTlmjZgdBgFgvrU7GOCyGDjP 6P7uNyz2m2QFpvrRIrn92mlo03Ua/yjJeCMnxBmnVKRUc/Z3sG/Wx9fJqx+eyYQRnf p6UGCCMEk/jy5Oy0O2Mvi8S+j12UyEQ05flmSDk8FyAdOkKgPMACPKQuvqkvOpIvF7 LBfmXYcwBsbZ/EP9Eewexcu1Ic1lPOUGiIEO3y6pL42atW1aKWUSdBVDDWNnkb469O PfCldYXv0zezlS7DiJ31tAEAsCSEXTUlAgd8D66fbAnKQWmPtSBRhJo2hv9LdHMrcW itIW3V6IPHqDQ== From: Jeff Layton To: linux-fsdevel@vger.kernel.org Cc: dhowells@redhat.com, lczerner@redhat.com, bxue@redhat.com, ceph-devel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-afs@lists.infradead.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, linux-btrfs@vger.kernel.org, Jeff Layton Subject: [RFC PATCH 1/4] vfs: report change attribute in statx for IS_I_VERSION inodes Date: Fri, 5 Aug 2022 14:35:40 -0400 Message-Id: <20220805183543.274352-2-jlayton@kernel.org> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20220805183543.274352-1-jlayton@kernel.org> References: <20220805183543.274352-1-jlayton@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org From: Jeff Layton Claim one of the spare fields in struct statx to hold a 64-bit change attribute. When statx requests this attribute, do an inode_query_iversion and fill the result in the field. Also update the test-statx.c program to fetch the change attribute as well. Signed-off-by: Jeff Layton --- fs/stat.c | 7 +++++++ include/linux/stat.h | 1 + include/uapi/linux/stat.h | 3 ++- samples/vfs/test-statx.c | 4 +++- 4 files changed, 13 insertions(+), 2 deletions(-) diff --git a/fs/stat.c b/fs/stat.c index 9ced8860e0f3..976e0a59ab23 100644 --- a/fs/stat.c +++ b/fs/stat.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include @@ -118,6 +119,11 @@ int vfs_getattr_nosec(const struct path *path, struct kstat *stat, stat->attributes_mask |= (STATX_ATTR_AUTOMOUNT | STATX_ATTR_DAX); + if ((request_mask & STATX_CHGATTR) && IS_I_VERSION(inode)) { + stat->result_mask |= STATX_CHGATTR; + stat->chgattr = inode_query_iversion(inode); + } + mnt_userns = mnt_user_ns(path->mnt); if (inode->i_op->getattr) return inode->i_op->getattr(mnt_userns, path, stat, @@ -611,6 +617,7 @@ cp_statx(const struct kstat *stat, struct statx __user *buffer) tmp.stx_dev_major = MAJOR(stat->dev); tmp.stx_dev_minor = MINOR(stat->dev); tmp.stx_mnt_id = stat->mnt_id; + tmp.stx_chgattr = stat->chgattr; return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0; } diff --git a/include/linux/stat.h b/include/linux/stat.h index 7df06931f25d..4a17887472f6 100644 --- a/include/linux/stat.h +++ b/include/linux/stat.h @@ -50,6 +50,7 @@ struct kstat { struct timespec64 btime; /* File creation time */ u64 blocks; u64 mnt_id; + u64 chgattr; }; #endif diff --git a/include/uapi/linux/stat.h b/include/uapi/linux/stat.h index 1500a0f58041..b45243a0fbc5 100644 --- a/include/uapi/linux/stat.h +++ b/include/uapi/linux/stat.h @@ -124,7 +124,7 @@ struct statx { __u32 stx_dev_minor; /* 0x90 */ __u64 stx_mnt_id; - __u64 __spare2; + __u64 stx_chgattr; /* Inode change attribute */ /* 0xa0 */ __u64 __spare3[12]; /* Spare space for future expansion */ /* 0x100 */ @@ -152,6 +152,7 @@ struct statx { #define STATX_BASIC_STATS 0x000007ffU /* The stuff in the normal stat struct */ #define STATX_BTIME 0x00000800U /* Want/got stx_btime */ #define STATX_MNT_ID 0x00001000U /* Got stx_mnt_id */ +#define STATX_CHGATTR 0x00002000U /* Want/git stx_chgattr */ #define STATX__RESERVED 0x80000000U /* Reserved for future struct statx expansion */ diff --git a/samples/vfs/test-statx.c b/samples/vfs/test-statx.c index 49c7a46cee07..767208d2f564 100644 --- a/samples/vfs/test-statx.c +++ b/samples/vfs/test-statx.c @@ -109,6 +109,8 @@ static void dump_statx(struct statx *stx) printf(" Inode: %-11llu", (unsigned long long) stx->stx_ino); if (stx->stx_mask & STATX_NLINK) printf(" Links: %-5u", stx->stx_nlink); + if (stx->stx_mask & STATX_CHGATTR) + printf(" Change Attr: 0x%llx", stx->stx_chgattr); if (stx->stx_mask & STATX_TYPE) { switch (stx->stx_mode & S_IFMT) { case S_IFBLK: @@ -218,7 +220,7 @@ int main(int argc, char **argv) struct statx stx; int ret, raw = 0, atflag = AT_SYMLINK_NOFOLLOW; - unsigned int mask = STATX_BASIC_STATS | STATX_BTIME; + unsigned int mask = STATX_BASIC_STATS | STATX_BTIME | STATX_CHGATTR; for (argv++; *argv; argv++) { if (strcmp(*argv, "-F") == 0) {