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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3EDC9C433F5 for ; Fri, 29 Oct 2021 18:40:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 259AC61075 for ; Fri, 29 Oct 2021 18:40:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230176AbhJ2Smg (ORCPT ); Fri, 29 Oct 2021 14:42:36 -0400 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:38054 "EHLO mx0b-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230084AbhJ2Sme (ORCPT ); Fri, 29 Oct 2021 14:42:34 -0400 Received: from pps.filterd (m0109332.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 19THwRHs017378 for ; Fri, 29 Oct 2021 11:40:05 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=facebook; bh=rsL5NlHP8KxKUy5s4fmzSbQhrgL5xu9r+MiCXbOhROQ=; b=R806FAXoTD4cAp1mAkdJPB+JjmJu42khpcryNCTpwou20zpPmy4dKsq7Ln5wSFTCkp/x 7wqIxI1tiCJAFugwSKrls8QPJ/DMl4kLCKxrbUjYqrTYwEr7qrVOR4dwAuTrN5w4tyhO oCjl/PQFUSosXg82PhU8O4WDhI4qR03NdlY= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com with ESMTP id 3c09avxhst-5 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Fri, 29 Oct 2021 11:40:04 -0700 Received: from intmgw001.06.ash9.facebook.com (2620:10d:c085:208::f) by mail.thefacebook.com (2620:10d:c085:11d::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.14; Fri, 29 Oct 2021 11:39:53 -0700 Received: by devvm225.atn0.facebook.com (Postfix, from userid 425415) id EBBAC5BCD6F5; Fri, 29 Oct 2021 11:39:51 -0700 (PDT) From: Stefan Roesch To: , CC: Subject: [PATCH v4 3/4] btrfs: add force_chunk_alloc sysfs entry to force allocation Date: Fri, 29 Oct 2021 11:39:49 -0700 Message-ID: <20211029183950.3613491-4-shr@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211029183950.3613491-1-shr@fb.com> References: <20211029183950.3613491-1-shr@fb.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-FB-Internal: Safe Content-Type: text/plain X-FB-Source: Intern X-Proofpoint-GUID: 2L0k04FF_yGyycfpFKSbsWxfUrMjtJDr X-Proofpoint-ORIG-GUID: 2L0k04FF_yGyycfpFKSbsWxfUrMjtJDr X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.182.1,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.0.607.475 definitions=2021-10-29_04,2021-10-29_01,2020-04-07_01 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 spamscore=0 bulkscore=0 lowpriorityscore=0 clxscore=1015 impostorscore=0 adultscore=0 phishscore=0 mlxscore=0 malwarescore=0 priorityscore=1501 suspectscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2110290101 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org This adds the force_chunk_alloc sysfs entry to be able to force a storage allocation. This is a debugging and test feature and is enabled with the CONFIG_BTRFS_DEBUG configuration option. It is stored at /sys/fs/btrfs//allocation//force_chunk_alloc. --- fs/btrfs/sysfs.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index 3b0bcbc2ed2e..983c53b76aa6 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -771,6 +771,64 @@ static ssize_t btrfs_chunk_size_store(struct kobject= *kobj, return val; } =20 +#ifdef CONFIG_BTRFS_DEBUG +/* + * Return if space info force allocation chunk flag is set. + */ +static ssize_t btrfs_force_chunk_alloc_show(struct kobject *kobj, + struct kobj_attribute *a, + char *buf) +{ + return snprintf(buf, PAGE_SIZE, "0\n"); +} + +/* + * Request chunk allocation with current chunk size. + */ +static ssize_t btrfs_force_chunk_alloc_store(struct kobject *kobj, + struct kobj_attribute *a, + const char *buf, size_t len) +{ + struct btrfs_space_info *space_info =3D to_space_info(kobj); + struct btrfs_fs_info *fs_info =3D to_fs_info(get_btrfs_kobj(kobj)); + struct btrfs_trans_handle *trans; + unsigned long val; + int ret; + + if (!fs_info) { + pr_err("couldn't get fs_info\n"); + return -EPERM; + } + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + if (sb_rdonly(fs_info->sb)) + return -EROFS; + + ret =3D kstrtoul(buf, 10, &val); + if (ret) + return ret; + + if (val =3D=3D 0) + return -EINVAL; + + /* + * Allocate new chunk. + */ + trans =3D btrfs_start_transaction(fs_info->extent_root, 0); + if (!trans) + return PTR_ERR(trans); + ret =3D btrfs_force_chunk_alloc(trans, space_info->flags); + btrfs_end_transaction(trans); + + if (ret =3D=3D 1) + return len; + + return -ENOSPC; +} +#endif + SPACE_INFO_ATTR(flags); SPACE_INFO_ATTR(total_bytes); SPACE_INFO_ATTR(bytes_used); @@ -783,6 +841,10 @@ SPACE_INFO_ATTR(disk_used); SPACE_INFO_ATTR(disk_total); BTRFS_ATTR_RW(space_info, chunk_size, btrfs_chunk_size_show, btrfs_chunk_size_store); +#ifdef CONFIG_BTRFS_DEBUG +BTRFS_ATTR_RW(space_info, force_chunk_alloc, btrfs_force_chunk_alloc_sho= w, + btrfs_force_chunk_alloc_store); +#endif =20 /* * Allocation information about block group types. @@ -801,6 +863,9 @@ static struct attribute *space_info_attrs[] =3D { BTRFS_ATTR_PTR(space_info, disk_used), BTRFS_ATTR_PTR(space_info, disk_total), BTRFS_ATTR_PTR(space_info, chunk_size), +#ifdef CONFIG_BTRFS_DEBUG + BTRFS_ATTR_PTR(space_info, force_chunk_alloc), +#endif NULL, }; ATTRIBUTE_GROUPS(space_info); --=20 2.30.2