From patchwork Tue Aug 16 13:27:56 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 598110 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 56D58C25B0E for ; Tue, 16 Aug 2022 13:28:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235737AbiHPN2R (ORCPT ); Tue, 16 Aug 2022 09:28:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41150 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235650AbiHPN2I (ORCPT ); Tue, 16 Aug 2022 09:28:08 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7F789E0D9; Tue, 16 Aug 2022 06:28:05 -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 E8751B81A1D; Tue, 16 Aug 2022 13:28:03 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E5AA0C433B5; Tue, 16 Aug 2022 13:28:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1660656482; bh=nK6rZB7MR8WlZXGgPQEe81a25J6Ko0zNfN9PA6j1OIc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=d2Qf9sWJJ+jKzenoJEsjO5kXUBEvENGb/9K4adHHsqbTpBz+ve0QewCxtr8rJC0xv ALR36IRznlrw5ZpP2+XCQ0nh3JHgqdD5Z1M0gg/3YlYuloIn4mwhNO1tmYPEO7nERy yo5jz3GRJDqa4uPS7zAfu6LdvMTMYxgFI+jdaQAVn96pw+jnSVVSPRT4mDfo6Ij0TP FXHQIqxVlGTNeKKlwACRArrzi/+flL74w1wJX6ikPsG/X9E4R3xVBRNNVoCu+tUfcu yWrRIMka+Jfc3ND/gHKNkGcLtGnzaeBs0xDkxQNY08hBHFM9aGQsDTmq69xEVBf3bA +VCWPp1ZxmAUA== From: Jeff Layton To: viro@zeniv.linux.org.uk Cc: dhowells@redhat.com, linux-afs@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org, ceph-devel@vger.kernel.org, Jeff Layton Subject: [PATCH 1/4] vfs: report change attribute in statx for IS_I_VERSION inodes Date: Tue, 16 Aug 2022 09:27:56 -0400 Message-Id: <20220816132759.43248-2-jlayton@kernel.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220816132759.43248-1-jlayton@kernel.org> References: <20220816132759.43248-1-jlayton@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: ceph-devel@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 display the change attribute and the mountid 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 | 8 ++++++-- 4 files changed, 16 insertions(+), 3 deletions(-) diff --git a/fs/stat.c b/fs/stat.c index 9ced8860e0f3..7c3d063c31ba 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_CHANGE_ATTR) && IS_I_VERSION(inode)) { + stat->result_mask |= STATX_CHANGE_ATTR; + stat->change_attr = 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_change_attr = stat->change_attr; return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0; } diff --git a/include/linux/stat.h b/include/linux/stat.h index 7df06931f25d..7b444c2ad0ad 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 change_attr; }; #endif diff --git a/include/uapi/linux/stat.h b/include/uapi/linux/stat.h index 1500a0f58041..fd839ec76aa4 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_change_attr; /* 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_CHANGE_ATTR 0x00002000U /* Want/got stx_change_attr */ #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..b104909721c4 100644 --- a/samples/vfs/test-statx.c +++ b/samples/vfs/test-statx.c @@ -107,6 +107,8 @@ static void dump_statx(struct statx *stx) printf("Device: %-15s", buffer); if (stx->stx_mask & STATX_INO) printf(" Inode: %-11llu", (unsigned long long) stx->stx_ino); + if (stx->stx_mask & STATX_MNT_ID) + printf(" MountId: %llx"), stx->stx_mnt_id; if (stx->stx_mask & STATX_NLINK) printf(" Links: %-5u", stx->stx_nlink); if (stx->stx_mask & STATX_TYPE) { @@ -145,7 +147,9 @@ static void dump_statx(struct statx *stx) if (stx->stx_mask & STATX_CTIME) print_time("Change: ", &stx->stx_ctime); if (stx->stx_mask & STATX_BTIME) - print_time(" Birth: ", &stx->stx_btime); + print_time("Birth: ", &stx->stx_btime); + if (stx->stx_mask & STATX_CHANGE_ATTR) + printf(" Change Attr: 0x%llx\n", stx->stx_change_attr); if (stx->stx_attributes_mask) { unsigned char bits, mbits; @@ -218,7 +222,7 @@ 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_MNT_ID | STATX_CHANGE_ATTR; for (argv++; *argv; argv++) { if (strcmp(*argv, "-F") == 0) {