From patchwork Mon Jun 10 10:43:23 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Garry X-Patchwork-Id: 804096 Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E4640139563; Mon, 10 Jun 2024 10:44:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=205.220.165.32 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718016295; cv=fail; b=PHagimgTZnRRxRrjK3xxSjd1n9OyXvE1RLwKJiI8nEhHq4GBBN3VBPJuHpPEmLH+MxtJmXDLgC+MMMNa53nUKg9GcNmrODW4NNaeNBcqFvOtSlMWaNIptt5CFi7vAvHI01+BhCJVu3d4rvq5UIQZCb1rEKGxVCCSUz1SCeY6ywk= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718016295; c=relaxed/simple; bh=5/bFNX2HlMfsKCpFbHV8K1O9l2Ek5stP7KrzYC8R7Bw=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: Content-Type:MIME-Version; b=mRf+QvGjp37/M3h0vl0wiV16VX7zbWzWrwsBLMPDPY5QtNLrFH+c4JvnWI1PIWfGyvCW1qduWdfP/QZwMlHCpCcDTDNfxPPqwdorl+4ODOQICnTMxaD8pvyE6JtVxrAs2fbIBV0KTI/qbrYME3SH46h5/nJXV58TvW4ZTSi81UM= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=oracle.com; spf=pass smtp.mailfrom=oracle.com; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b=hTNc+YEW; dkim=pass (1024-bit key) header.d=oracle.onmicrosoft.com header.i=@oracle.onmicrosoft.com header.b=gORaHUzQ; arc=fail smtp.client-ip=205.220.165.32 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=oracle.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=oracle.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="hTNc+YEW"; dkim=pass (1024-bit key) header.d=oracle.onmicrosoft.com header.i=@oracle.onmicrosoft.com header.b="gORaHUzQ" Received: from pps.filterd (m0333521.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 45A4BSKj006761; Mon, 10 Jun 2024 10:44:00 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h= from:to:cc:subject:date:message-id:in-reply-to:references :content-transfer-encoding:content-type:mime-version; s= corp-2023-11-20; bh=TbanG9OOchDY9/z2mDu4fqQnev6OFwdKu+Z6IOGBWmw=; b= hTNc+YEWRRa5w+ibiHckZif9bzmWjXAw8QpH8zn/GDelgGgwqrF3l56Bk1O4ZYuM AkYsRZqSznoc4I3Sb/5u098zNTqgWfGGWonNcTXzxaV1RU/pMx+edCI0xh6AWFfp 8LI7EN2ovFc2WiHOfd1Wf2uYgl/V3vesLT00YBXr6Zpky7bvzSgVf36UuyHW91nj 7OVf4Q+xIkQXfPXQ81ULzcojzSI/xN53mKnACSqKt1ZcE9eeXeRLHUMZ+gtiqgS1 bhC7uG1KdFpF09SrtwZY/m9HkV4CzPPhU8x1Zvb0uE7lovogNSrhLZbTfJox052S rH/FuzW8/v4JafNwVoCWNA== Received: from phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta03.appoci.oracle.com [138.1.37.129]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 3ymhf1a8t2-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 10 Jun 2024 10:43:59 +0000 (GMT) Received: from pps.filterd (phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (8.17.1.19/8.17.1.19) with ESMTP id 45A9B996012520; Mon, 10 Jun 2024 10:43:59 GMT Received: from nam04-dm6-obe.outbound.protection.outlook.com (mail-dm6nam04lp2040.outbound.protection.outlook.com [104.47.73.40]) by phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 3ync9v4sck-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 10 Jun 2024 10:43:59 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=SaAyLgYSHuwYp5DkVuxDT9xBJjiChgdGTIkPUglvEMh90V9IUhJcYukzjmwfA1ZQu1OeGxzvQs8ZPBo4e54Yk5OqB5JP4JklIUvTz/kcI4fws8zeHAJs2Tdz2xhMZsyPWt4Y/GUtnFk5+8Xzd0ht8eJEerFfRlN/2QpUcOzWAhcY/LJTkMSj9MK5buez8j9XthiRJvnYkMG7MMaaftaFm8dcnXNhe67IOFfSkq8Q6CCvUkSXEMz+IGwDw09ITEGR3zMadikLXIS0h1+xWmUZIfYgATz7/ENnUbeL3nIcKCSjQEWTcmOQUrbIZDrI76E2m3pCeK0C3a4HACJ9LtJQIQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=TbanG9OOchDY9/z2mDu4fqQnev6OFwdKu+Z6IOGBWmw=; b=ntqVOn09St3essbzi/Soxpn+Wc45TENCokWQU+r6Qn0Yc/Z29RWz6rClf0wD8h0TrB7l+X7Vr5hXJTDH2fvsU3wiwCeofSNMRvvIU68iuWtdSRMjkz/WAsJS0PYnyTRAV8lKgoa+eltOhuOthxSuscMddZAUHtH9l3vkPlPopOjmNOlOg7jM0Rkz2QmS3ykNnxlLfjutnKYsfnOTxjoMk6crfOvgGPYXIA5NT07/1QK3O2CxLSt4fT5Ak+bMIbsdzhsLonx9DYDICrz5uKh5v+7ilEZkMOVUUTKpsEtO7BxTv0rGXQSFk4R00McO10VhKj5lbt0pS1SzXbUh3/2IuQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=oracle.com; dmarc=pass action=none header.from=oracle.com; dkim=pass header.d=oracle.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.onmicrosoft.com; s=selector2-oracle-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=TbanG9OOchDY9/z2mDu4fqQnev6OFwdKu+Z6IOGBWmw=; b=gORaHUzQU/DNUE+ieKs/4w57DNpK7/5ocK/M/NLWdixeTzwt5eIcbztLS8qTUnhfzOMPSFoElL+EEtS9TjZF+DVlon4L871y1O0/93H8S7MPKaQRzcN3QQSEK+parl1rZEo4LuUhQ+Unz/Ocv/0HAWLTcLf+eY6T5p6n/Zdq38o= Received: from DM6PR10MB4313.namprd10.prod.outlook.com (2603:10b6:5:212::20) by SJ0PR10MB5613.namprd10.prod.outlook.com (2603:10b6:a03:3d0::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7633.31; Mon, 10 Jun 2024 10:43:56 +0000 Received: from DM6PR10MB4313.namprd10.prod.outlook.com ([fe80::4f45:f4ab:121:e088]) by DM6PR10MB4313.namprd10.prod.outlook.com ([fe80::4f45:f4ab:121:e088%6]) with mapi id 15.20.7633.036; Mon, 10 Jun 2024 10:43:56 +0000 From: John Garry To: axboe@kernel.dk, kbusch@kernel.org, hch@lst.de, sagi@grimberg.me, jejb@linux.ibm.com, martin.petersen@oracle.com, viro@zeniv.linux.org.uk, brauner@kernel.org, dchinner@redhat.com, jack@suse.cz Cc: djwong@kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, linux-fsdevel@vger.kernel.org, tytso@mit.edu, jbongio@google.com, linux-scsi@vger.kernel.org, ojaswin@linux.ibm.com, linux-aio@kvack.org, linux-btrfs@vger.kernel.org, io-uring@vger.kernel.org, nilay@linux.ibm.com, ritesh.list@gmail.com, willy@infradead.org, agk@redhat.com, snitzer@kernel.org, mpatocka@redhat.com, dm-devel@lists.linux.dev, hare@suse.de, Prasad Singamsetty , John Garry Subject: [PATCH v8 04/10] fs: Add initial atomic write support info to statx Date: Mon, 10 Jun 2024 10:43:23 +0000 Message-Id: <20240610104329.3555488-5-john.g.garry@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20240610104329.3555488-1-john.g.garry@oracle.com> References: <20240610104329.3555488-1-john.g.garry@oracle.com> X-ClientProxiedBy: MN2PR05CA0021.namprd05.prod.outlook.com (2603:10b6:208:c0::34) To DM6PR10MB4313.namprd10.prod.outlook.com (2603:10b6:5:212::20) Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6PR10MB4313:EE_|SJ0PR10MB5613:EE_ X-MS-Office365-Filtering-Correlation-Id: 327340ad-2578-4670-26f1-08dc893a3a8d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230031|7416005|376005|1800799015|366007|921011; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:DM6PR10MB4313.namprd10.prod.outlook.com; PTR:; CAT:NONE; SFS:(13230031)(7416005)(376005)(1800799015)(366007)(921011); DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: RL6yRYF6O+qBEyJi2Oox0sDfNeFga5mSK3mIa1IDtGhBNYlUHef/H7oRTWIMGAjPKu0DUI3Dyhj0XeQgFNglekE3ydqfzZQGasC9A0lH9eH+6jUHafiB5Pe9kGnqF8z0c9bK3o3WoqfEHyru+wkBcWXuMw42xlTXL3b/Lwrxv8JVVeZbaKmiNjFQLDbHkqDouOErMd+a7kkRL/osmeG3IMuv3jyWFlwHOxO8CuRQfiVVmSARo3w6fbzCu9lKRXkLWODIdyZh80T7q1WQRTSLXVOR5w+a5FogQOI/TTh6PcyiIfMO3o+2PYEQneQdHJ3yxioynb69H/2kjyH6UCTUnJ6zo7wxAiiG2kNc+eeOUAPfBI61nGrKv9NTJFuq6v1tmvjiWDIlIcbsNOtrhJGo3HXWcp9PApu3mMTi85MKCbHsk0iYYwaOyiGfdVPwxt7oB4BvvTleCFFJE4fWKyM69l40T6WohyNu/Iuf0bEJsTnnelbm3dMsm7WMS7S9NWSpW/gWPE98q2SCCVtReXdHy08+3nilIoFLXoQkpkuiJh2o6yUlVkSfx8Yg9+oaSLE1TWd6Lc+HYN4J/DQd7akzi6KO2IF2fWIyLXZoTnyTGSLdGZMWxmiARZH2mBT17dcL7ihAuvsgRpODRcaTGBHkFPSkCjFtLUdYbRUc9IBYc3l9i3ftcoTpbgS7PdG7Ws6xDUN07Re5Ml2WRDRxqD2ZNRJEizwvjAiBmKENf9j7QTAOlL14qlJ6I3qSgXjikuRGhjvZtIUxlX3NRCvkWtUbqy9nY0dS8cf4nht9w1h48kd40WliFw2UmxTqJ4eCHFEcA7D/H/EQ7uQ5NNZQmEgb+QUdTYEXv35M2bRASwFXLwSRYBuSZ+3sIeKW6uDkCFhm/UqIBz6d71YlDU1tMgvYn/vIvBXyhmuZBVZo7TfKS743g2UfyNI/IlBHmGZI+TQpjNqCjokItpFi10obbrpqp+gzjWQz46T8Pj0Y3DoyFHjz5Lrq9k1RK/nodbLgba5vGyurgHtY+8jkj9ImAbMqOiwrXYL8BzM1YJMxs4CMPIUEjeGJbmuPBe3D92F7L7m50ecs0gGoxWCa8raNNEUNc7fs1/HtWnck1eusZqy2xd2FrswBeMYkjvMjlPcrC+tXHNV9jHYXR0Q0K8bHGn0GRrGi+REJwtU5tAeWhvhBJd4OEb0jAf5pqPnnhBRY8aDFvkK99JgXke/b+w+uoKES6CqfXJSTeXgBzXYgwBHMfJaZp4PzSCtCEuWfDn66bOyZ10nZIy123yM6oGJYYEM6mcF5OJewwCiu3LymwVHZLPdNd1iSb0WgQNXnouUuAuZu0YaeOJUNqsSJqVuao0DX1KlFn0CF3rg0Pf0ySKDcxRub8g7KMFx7GUF5qw7o6zorADea7wk2J27T3p/665q4f/Wv0aqJL39er2JYQc7rmowdptTTsHs3xuOJORzjkBAEJAjCagnHPsf+2yFLX5Jqik6XKf1QO85+oM+ugJTIFBNrWVY96T4vLwYUHdNbQ1SahUeiwa61Klao7k5Xme1za4JTprU2tvcunVf/heU7qhcGC9NI2icUA35uudUFk/DiQ8B3tfpA/iazrXwQstZpVg== X-MS-Exchange-AntiSpam-ExternalHop-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-0: teLK+IZRo8KTFXeimExTqs5v5Qh+xK6VoESFpiZ22k0p+s4B9xnqsNyNT3xzMi5l/tjQ/ri42o/2BRJw0wqJEMQUVsv1TwmENxxaXYqaZY1vatvVdc2/vRm2C0DUU33dB0ZT83ErkZTRc7uY7t5pyQKmevZsXG/kuBDT1Awxixsi6oXMXgZAHC/jUgWzHbWuUso/CZsSDsGBmoXtXBF+MgSXbxL3aROuJmGRy7NWieH0RpZWvcJox+yDfHhT22VRLSgzLt260nIppYhEWXyU0zay2qeyRhAz5agEUu+gYT3evCU+4ghoTcOQMPZHEiPI96YPQRq5P3XZ2v4Nfx8NqXs1lRaOF5LBm01GXNraPGyz0Xrc9g93Uy/CbRVIh/pkbhQj8X9FiaS4m/hRU1ajUfVdJLDLjvkGz9eG3WRO9ySSkCqbFS7sz/gtkiE6CPQO4ENd937mJDPxJ6M7tpVr2u7o3+YvnarFye+1esliV61J0n2nxbS3VhgKm5o07mQ/gfe2QD2PThH0dYjMG++SN3GB6t1sZ/8Wn0pujHyEikNSWELLSOEBjbpuMh5i96Aem0OpW4B09fA44JckdJ9PcJ1HBKszFHLPRZmuaUNR5d0= X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-Network-Message-Id: 327340ad-2578-4670-26f1-08dc893a3a8d X-MS-Exchange-CrossTenant-AuthSource: DM6PR10MB4313.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Jun 2024 10:43:56.4028 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: MPjDJFY6fKO/kVjvju266VHeqxxCTppwBNf80uBfh+znxx+ajV+BtNUpwJK+BWzHYIjb+EwSmEpxjmlGlupfzA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR10MB5613 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-06-10_02,2024-06-10_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 adultscore=0 phishscore=0 suspectscore=0 malwarescore=0 mlxscore=0 spamscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2405010000 definitions=main-2406100081 X-Proofpoint-ORIG-GUID: iPsZLLU9F9r-Pjjtoe1J9zvg5zuBshN_ X-Proofpoint-GUID: iPsZLLU9F9r-Pjjtoe1J9zvg5zuBshN_ From: Prasad Singamsetty Extend statx system call to return additional info for atomic write support support for a file. Helper function generic_fill_statx_atomic_writes() can be used by FSes to fill in the relevant statx fields. For now atomic_write_segments_max will always be 1, otherwise some rules would need to be imposed on iovec length and alignment, which we don't want now. Signed-off-by: Prasad Singamsetty jpg: relocate bdev support to another patch Signed-off-by: John Garry --- fs/stat.c | 34 ++++++++++++++++++++++++++++++++++ include/linux/fs.h | 3 +++ include/linux/stat.h | 3 +++ include/uapi/linux/stat.h | 12 ++++++++++-- 4 files changed, 50 insertions(+), 2 deletions(-) diff --git a/fs/stat.c b/fs/stat.c index 70bd3e888cfa..72d0e6357b91 100644 --- a/fs/stat.c +++ b/fs/stat.c @@ -89,6 +89,37 @@ void generic_fill_statx_attr(struct inode *inode, struct kstat *stat) } EXPORT_SYMBOL(generic_fill_statx_attr); +/** + * generic_fill_statx_atomic_writes - Fill in atomic writes statx attributes + * @stat: Where to fill in the attribute flags + * @unit_min: Minimum supported atomic write length in bytes + * @unit_max: Maximum supported atomic write length in bytes + * + * Fill in the STATX{_ATTR}_WRITE_ATOMIC flags in the kstat structure from + * atomic write unit_min and unit_max values. + */ +void generic_fill_statx_atomic_writes(struct kstat *stat, + unsigned int unit_min, + unsigned int unit_max) +{ + /* Confirm that the request type is known */ + stat->result_mask |= STATX_WRITE_ATOMIC; + + /* Confirm that the file attribute type is known */ + stat->attributes_mask |= STATX_ATTR_WRITE_ATOMIC; + + if (unit_min) { + stat->atomic_write_unit_min = unit_min; + stat->atomic_write_unit_max = unit_max; + /* Initially only allow 1x segment */ + stat->atomic_write_segments_max = 1; + + /* Confirm atomic writes are actually supported */ + stat->attributes |= STATX_ATTR_WRITE_ATOMIC; + } +} +EXPORT_SYMBOL_GPL(generic_fill_statx_atomic_writes); + /** * vfs_getattr_nosec - getattr without security checks * @path: file to get attributes from @@ -659,6 +690,9 @@ cp_statx(const struct kstat *stat, struct statx __user *buffer) tmp.stx_dio_mem_align = stat->dio_mem_align; tmp.stx_dio_offset_align = stat->dio_offset_align; tmp.stx_subvol = stat->subvol; + tmp.stx_atomic_write_unit_min = stat->atomic_write_unit_min; + tmp.stx_atomic_write_unit_max = stat->atomic_write_unit_max; + tmp.stx_atomic_write_segments_max = stat->atomic_write_segments_max; return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0; } diff --git a/include/linux/fs.h b/include/linux/fs.h index e049414bef7d..db26b4a70c62 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -3235,6 +3235,9 @@ extern const struct inode_operations page_symlink_inode_operations; extern void kfree_link(void *); void generic_fillattr(struct mnt_idmap *, u32, struct inode *, struct kstat *); void generic_fill_statx_attr(struct inode *inode, struct kstat *stat); +void generic_fill_statx_atomic_writes(struct kstat *stat, + unsigned int unit_min, + unsigned int unit_max); extern int vfs_getattr_nosec(const struct path *, struct kstat *, u32, unsigned int); extern int vfs_getattr(const struct path *, struct kstat *, u32, unsigned int); void __inode_add_bytes(struct inode *inode, loff_t bytes); diff --git a/include/linux/stat.h b/include/linux/stat.h index bf92441dbad2..3d900c86981c 100644 --- a/include/linux/stat.h +++ b/include/linux/stat.h @@ -54,6 +54,9 @@ struct kstat { u32 dio_offset_align; u64 change_cookie; u64 subvol; + u32 atomic_write_unit_min; + u32 atomic_write_unit_max; + u32 atomic_write_segments_max; }; /* These definitions are internal to the kernel for now. Mainly used by nfsd. */ diff --git a/include/uapi/linux/stat.h b/include/uapi/linux/stat.h index 67626d535316..887a25286441 100644 --- a/include/uapi/linux/stat.h +++ b/include/uapi/linux/stat.h @@ -126,9 +126,15 @@ struct statx { __u64 stx_mnt_id; __u32 stx_dio_mem_align; /* Memory buffer alignment for direct I/O */ __u32 stx_dio_offset_align; /* File offset alignment for direct I/O */ - __u64 stx_subvol; /* Subvolume identifier */ /* 0xa0 */ - __u64 __spare3[11]; /* Spare space for future expansion */ + __u64 stx_subvol; /* Subvolume identifier */ + __u32 stx_atomic_write_unit_min; /* Min atomic write unit in bytes */ + __u32 stx_atomic_write_unit_max; /* Max atomic write unit in bytes */ + /* 0xb0 */ + __u32 stx_atomic_write_segments_max; /* Max atomic write segment count */ + __u32 __spare1[1]; + /* 0xb8 */ + __u64 __spare3[9]; /* Spare space for future expansion */ /* 0x100 */ }; @@ -157,6 +163,7 @@ struct statx { #define STATX_DIOALIGN 0x00002000U /* Want/got direct I/O alignment info */ #define STATX_MNT_ID_UNIQUE 0x00004000U /* Want/got extended stx_mount_id */ #define STATX_SUBVOL 0x00008000U /* Want/got stx_subvol */ +#define STATX_WRITE_ATOMIC 0x00010000U /* Want/got atomic_write_* fields */ #define STATX__RESERVED 0x80000000U /* Reserved for future struct statx expansion */ @@ -192,6 +199,7 @@ struct statx { #define STATX_ATTR_MOUNT_ROOT 0x00002000 /* Root of a mount */ #define STATX_ATTR_VERITY 0x00100000 /* [I] Verity protected file */ #define STATX_ATTR_DAX 0x00200000 /* File is currently in DAX state */ +#define STATX_ATTR_WRITE_ATOMIC 0x00400000 /* File supports atomic write operations */ #endif /* _UAPI_LINUX_STAT_H */