From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 53B27C43603 for ; Fri, 20 Dec 2019 05:06:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 24B3B21D7D for ; Fri, 20 Dec 2019 05:06:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="dipDi9yl" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725920AbfLTFGd (ORCPT ); Fri, 20 Dec 2019 00:06:33 -0500 Received: from aserp2120.oracle.com ([141.146.126.78]:57976 "EHLO aserp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725267AbfLTFGd (ORCPT ); Fri, 20 Dec 2019 00:06:33 -0500 Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.27/8.16.0.27) with SMTP id xBK53ti7102105 for ; Fri, 20 Dec 2019 05:06:31 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : subject : date : message-id : in-reply-to : references; s=corp-2019-08-05; bh=9MyQERM+bXMho0njgx82bg41YtGpXA/o8Grm+feYmNA=; b=dipDi9ylUw7JBPl3sfaLQWgqBA3AK8ktJg0lGRopI/cS4xe8bq/jc1Y/hiyoIGX3306g fOs3eKXyk1/mp9GY0kTysAw/GJh8+Hh3RQLkV0tiH8UCDjhghk+6X1fMadVBwZawipy1 bB28+RRL4MH+lEQudD/MZOLAKKV7kPEACSIjllnVFpEHNjqujVGWBsx35jEO6yQGOV2B 4T1y7hW2pQxYdt52XLgyAfXVwYPeamB8gWl5zmX0ePNz+4CB5l94hNDR2BjtG8f+pC9W NYiraj67U3hpqWLvgcKbYXDDJype3+JIyXTnhHKH0xVBNG4L5j+xJ2n8uCNxw+LYdlz4 QA== Received: from aserp3030.oracle.com (aserp3030.oracle.com [141.146.126.71]) by aserp2120.oracle.com with ESMTP id 2x01knpp4b-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Fri, 20 Dec 2019 05:06:31 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.27/8.16.0.27) with SMTP id xBK53tBY075934 for ; Fri, 20 Dec 2019 05:06:31 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by aserp3030.oracle.com with ESMTP id 2x0pcbawu6-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Fri, 20 Dec 2019 05:06:30 +0000 Received: from abhmp0008.oracle.com (abhmp0008.oracle.com [141.146.116.14]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id xBK56T2f009222 for ; Fri, 20 Dec 2019 05:06:29 GMT Received: from tp.wifi.oracle.com (/192.188.170.104) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 19 Dec 2019 21:06:29 -0800 From: Anand Jain To: linux-btrfs@vger.kernel.org Subject: [PATCH 3/3] btrfs: sysfs, create by_pid readmirror attribute Date: Fri, 20 Dec 2019 13:06:05 +0800 Message-Id: <1576818365-20286-4-git-send-email-anand.jain@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1576818365-20286-1-git-send-email-anand.jain@oracle.com> References: <1576818365-20286-1-git-send-email-anand.jain@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9476 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=1 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1911140001 definitions=main-1912200038 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9476 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1911140001 definitions=main-1912200038 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Add the exisiting %pid based readmirror policy as an attribute /sys/fs/btrfs/UUID/readmirror/by_pid When read, this returns 0 or 1. 1 indicates the currently active policy. When written with 1, it sets pid as the current active policy and when written 0 it resets to the default readmirror policy which as of now is pid as well. For any other value it returns EINVAL. Signed-off-by: Anand Jain --- fs/btrfs/sysfs.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 53 insertions(+), 1 deletion(-) diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index da5e1938e9b9..5a09cf868328 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -355,7 +355,59 @@ static ssize_t supported_checksums_show(struct kobject *kobj, #endif +#define readmirror_to_fs_devices(_kobj) to_fs_devs((_kobj)->parent) +/* + * Set the readmirror type to BTRFS_READMIRROR_BY_PID + */ +static ssize_t btrfs_sysfs_readmirror_by_pid_store(struct kobject *kobj, + struct kobj_attribute *a, + const char *buf, size_t count) +{ + int ret; + unsigned long val; + struct btrfs_fs_devices *fs_devices; + + fs_devices = readmirror_to_fs_devices(kobj); + + ret = kstrtoul(skip_spaces(buf), 0, &val); + if (ret) + return ret; + + switch (val) { + case 0: + atomic_set(&fs_devices->readmirror, BTRFS_READMIRROR_DEFAULT); + break; + case 1: + atomic_set(&fs_devices->readmirror, BTRFS_READMIRROR_BY_PID); + break; + default: + return -EINVAL; + } + + return count; +} + +static ssize_t btrfs_sysfs_readmirror_by_pid_show(struct kobject *kobj, + struct kobj_attribute *a, + char *buf) +{ + int val; + struct btrfs_fs_devices *fs_devices; + + fs_devices = readmirror_to_fs_devices(kobj); + + if (atomic_read(&fs_devices->readmirror) == BTRFS_READMIRROR_BY_PID) + val = 1; + else + val = 0; + + return snprintf(buf, PAGE_SIZE, "%d\n", val); +} +BTRFS_ATTR_RW(readmirror, by_pid, btrfs_sysfs_readmirror_by_pid_show, + btrfs_sysfs_readmirror_by_pid_store); + static const struct attribute *btrfs_readmirror_attrs[] = { + BTRFS_ATTR_PTR(readmirror, by_pid), NULL, }; @@ -1241,7 +1293,7 @@ int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) error = -ENOMEM; goto failure; } - error = sysfs_create_files(fs_info->readmirror_kobj, + error = sysfs_create_files(fs_devs->readmirror_kobj, btrfs_readmirror_attrs); if (error) goto failure; -- 1.8.3.1