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=-10.6 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_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 B58AEC43441 for ; Thu, 22 Nov 2018 05:19:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 78FAB20820 for ; Thu, 22 Nov 2018 05:19:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="A4J17aVI" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 78FAB20820 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=oracle.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-btrfs-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731144AbeKVP4v (ORCPT ); Thu, 22 Nov 2018 10:56:51 -0500 Received: from userp2120.oracle.com ([156.151.31.85]:46324 "EHLO userp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729179AbeKVP4v (ORCPT ); Thu, 22 Nov 2018 10:56:51 -0500 Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.22/8.16.0.22) with SMTP id wAM5InDp097886 for ; Thu, 22 Nov 2018 05:19:07 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-2018-07-02; bh=TVzDE8kRYDbo2XzjLL45EJ8i8VRrKDp8N/9vxiklv94=; b=A4J17aVINHlwdYtN7yvpt9J8sAfwCc3VuS0zrLvk4z6a9OmU6cTW740Euzi9uJ6TAaIo /MxVnMiC/hxvIDR9KkcXappC8D7P4OKIqLoktAhtRDqPCAkIMfEQu+d0S4Z0yYH3hV7o V+/nVGRDOqKPRVmdzb1vp83VvB02t2C6sLI9Dx/DNhPaSIwHs/QxoL5BluoFZA/24AFh T+z8X+mJqBNt1LmtfgssDBhsFXFVzzGD/o8bG1OqeRnfrSbPwmV8+zQJoq4XZ/8d7d0l pcF1o7JEIEL0Zeb7zjEexCZYIuNScRo7/qhdbecC9cmTcxdHisg/omx6cYZls+SJ3JJE LQ== Received: from aserv0021.oracle.com (aserv0021.oracle.com [141.146.126.233]) by userp2120.oracle.com with ESMTP id 2ntbmqvss7-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Thu, 22 Nov 2018 05:19:07 +0000 Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by aserv0021.oracle.com (8.14.4/8.14.4) with ESMTP id wAM5J1NK031437 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Thu, 22 Nov 2018 05:19:01 GMT Received: from abhmp0003.oracle.com (abhmp0003.oracle.com [141.146.116.9]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id wAM5J1NP029873 for ; Thu, 22 Nov 2018 05:19:01 GMT Received: from tpasj.sg.oracle.com (/192.188.170.109) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 21 Nov 2018 21:19:01 -0800 From: Anand Jain To: linux-btrfs@vger.kernel.org Subject: [PATCH v12] btrfs-progs: add cli to forget one or all scanned devices Date: Thu, 22 Nov 2018 13:18:36 +0800 Message-Id: <1542863917-8636-3-git-send-email-anand.jain@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1542863917-8636-1-git-send-email-anand.jain@oracle.com> References: <1542863917-8636-1-git-send-email-anand.jain@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9084 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=4 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1811220050 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org This patch adds cli btrfs device forget [dev] to remove the given device structure in the kernel if the device is unmounted. If no argument is given it shall remove all stale (device which are not mounted) from the kernel. Signed-off-by: Anand Jain Reviewed-by: Nikolay Borisov --- v11->v12: none. v1->v12: pls ref to the cover-letter. cmds-device.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++++----------- ioctl.h | 2 ++ 2 files changed, 61 insertions(+), 13 deletions(-) diff --git a/cmds-device.c b/cmds-device.c index 2a05f70a76a9..280d6f555377 100644 --- a/cmds-device.c +++ b/cmds-device.c @@ -254,10 +254,32 @@ static int cmd_device_delete(int argc, char **argv) return _cmd_device_remove(argc, argv, cmd_device_delete_usage); } +static int btrfs_forget_devices(char *path) +{ + struct btrfs_ioctl_vol_args args; + int ret; + int fd; + + fd = open("/dev/btrfs-control", O_RDWR); + if (fd < 0) + return -errno; + + memset(&args, 0, sizeof(args)); + if (path) + strncpy_null(args.name, path); + ret = ioctl(fd, BTRFS_IOC_FORGET_DEV, &args); + if (ret) + ret = -errno; + close(fd); + return ret; +} + static const char * const cmd_device_scan_usage[] = { - "btrfs device scan [(-d|--all-devices)| [...]]", - "Scan devices for a btrfs filesystem", + "btrfs device scan [(-d|--all-devices)|(-u|--forget)| "\ + "[...]]", + "Scan or forget (deregister) devices for a btrfs filesystem", " -d|--all-devices (deprecated)", + " -u|--forget [ ..]", NULL }; @@ -267,37 +289,53 @@ static int cmd_device_scan(int argc, char **argv) int devstart; int all = 0; int ret = 0; + int forget = 0; optind = 0; while (1) { int c; static const struct option long_options[] = { { "all-devices", no_argument, NULL, 'd'}, + { "forget", no_argument, NULL, 'u'}, { NULL, 0, NULL, 0} }; - c = getopt_long(argc, argv, "d", long_options, NULL); + c = getopt_long(argc, argv, "du", long_options, NULL); if (c < 0) break; switch (c) { case 'd': all = 1; break; + case 'u': + forget = 1; + break; default: usage(cmd_device_scan_usage); } } devstart = optind; + if (all && forget) + usage(cmd_device_scan_usage); + if (all && check_argc_max(argc - optind, 1)) usage(cmd_device_scan_usage); if (all || argc - optind == 0) { - printf("Scanning for Btrfs filesystems\n"); - ret = btrfs_scan_devices(); - error_on(ret, "error %d while scanning", ret); - ret = btrfs_register_all_devices(); - error_on(ret, "there are %d errors while registering devices", ret); + if (forget) { + ret = btrfs_forget_devices(NULL); + error_on(ret, "'%s', forget failed", + strerror(-ret)); + } else { + printf("Scanning for Btrfs filesystems\n"); + ret = btrfs_scan_devices(); + error_on(ret, "error %d while scanning", ret); + ret = btrfs_register_all_devices(); + error_on(ret, + "there are %d errors while registering devices", + ret); + } goto out; } @@ -315,11 +353,19 @@ static int cmd_device_scan(int argc, char **argv) ret = 1; goto out; } - printf("Scanning for Btrfs filesystems in '%s'\n", path); - if (btrfs_register_one_device(path) != 0) { - ret = 1; - free(path); - goto out; + if (forget) { + ret = btrfs_forget_devices(path); + if (ret) + error("Can't forget '%s': %s", + path, strerror(-ret)); + } else { + printf("Scanning for Btrfs filesystems in '%s'\n", + path); + if (btrfs_register_one_device(path) != 0) { + ret = 1; + free(path); + goto out; + } } free(path); } diff --git a/ioctl.h b/ioctl.h index 709e996f401c..e27d80e09392 100644 --- a/ioctl.h +++ b/ioctl.h @@ -721,6 +721,8 @@ static inline char *btrfs_err_str(enum btrfs_err_code err_code) struct btrfs_ioctl_vol_args) #define BTRFS_IOC_SCAN_DEV _IOW(BTRFS_IOCTL_MAGIC, 4, \ struct btrfs_ioctl_vol_args) +#define BTRFS_IOC_FORGET_DEV _IOW(BTRFS_IOCTL_MAGIC, 5, \ + struct btrfs_ioctl_vol_args) /* trans start and trans end are dangerous, and only for * use by applications that know how to avoid the * resulting deadlocks -- 1.8.3.1