From patchwork Fri Dec 3 22:04:43 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Roesch X-Patchwork-Id: 12655865 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 C59A1C433F5 for ; Fri, 3 Dec 2021 22:04:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1383320AbhLCWIT (ORCPT ); Fri, 3 Dec 2021 17:08:19 -0500 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:57032 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1383318AbhLCWIR (ORCPT ); Fri, 3 Dec 2021 17:08:17 -0500 Received: from pps.filterd (m0109334.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 1B3L6Loh021533 for ; Fri, 3 Dec 2021 14:04:52 -0800 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=XaCykFwXMCDAcNbB2ExNRUs+wHOEbi/f6LfQ6DxQcGs=; b=Y6G/t8q7GXoaE4hSfUxJo7oSWShYu/QswGgOjAI+HVeffO/kPBcyzRCw0kf04r77NX/l HinerzK7M7suCnBcNJPyJlHWa35oZRkTWqH0zmg505kibADeV/REIXBkvhI2CK02upO7 gwLAQJHtKXN0dpMyfGpnKz+nuoYM1eY6YmA= Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com with ESMTP id 3cqeku5qxq-5 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Fri, 03 Dec 2021 14:04:52 -0800 Received: from intmgw001.38.frc1.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:83::4) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.20; Fri, 3 Dec 2021 14:04:51 -0800 Received: by devvm225.atn0.facebook.com (Postfix, from userid 425415) id 31D1B76B31D5; Fri, 3 Dec 2021 14:04:47 -0800 (PST) From: Stefan Roesch To: , CC: Subject: [PATCH v6 2/4] btrfs: expose chunk size in sysfs. Date: Fri, 3 Dec 2021 14:04:43 -0800 Message-ID: <20211203220445.2312182-3-shr@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211203220445.2312182-1-shr@fb.com> References: <20211203220445.2312182-1-shr@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-FB-Source: Intern X-Proofpoint-ORIG-GUID: 5x-QKfIRn5SKpgGsWBncQt9XtIAEha3J X-Proofpoint-GUID: 5x-QKfIRn5SKpgGsWBncQt9XtIAEha3J X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2021-12-03_11,2021-12-02_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 impostorscore=0 clxscore=1015 priorityscore=1501 lowpriorityscore=0 suspectscore=0 malwarescore=0 spamscore=0 adultscore=0 bulkscore=0 phishscore=0 mlxlogscore=999 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112030142 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org This adds a new sysfs entry in /sys/fs/btrfs//allocation//chunk_size. This allows to query the chunk size and also set the chunk size. Signed-off-by: Stefan Roesch --- fs/btrfs/sysfs.c | 94 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 94 insertions(+) diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index f9eff3b0f77c..39890ea21997 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -21,6 +21,7 @@ #include "space-info.h" #include "block-group.h" #include "qgroup.h" +#include "misc.h" /* * Structure name Path @@ -92,6 +93,7 @@ static struct btrfs_feature_attr btrfs_attr_features_##_name = { \ static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj); +static inline struct kobject *get_btrfs_kobj(struct kobject *kobj); static struct btrfs_feature_attr *to_btrfs_feature_attr(struct kobj_attribute *a) { @@ -708,6 +710,81 @@ static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ } \ BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field) +/* + * Return space info chunk size. + */ +static ssize_t btrfs_chunk_size_show(struct kobject *kobj, + struct kobj_attribute *a, char *buf) +{ + struct btrfs_space_info *sinfo = to_space_info(kobj); + + return sysfs_emit(buf, "%llu\n", atomic64_read(&sinfo->chunk_size)); +} + +/* + * Store new user supplied chunk size in space info. + * + * Note: If the new chunk size value is larger than 10% of free space it is + * reduced to match that limit. + */ +static ssize_t btrfs_chunk_size_store(struct kobject *kobj, + struct kobj_attribute *a, + const char *buf, size_t len) +{ + struct btrfs_space_info *space_info = to_space_info(kobj); + struct btrfs_fs_info *fs_info = to_fs_info(get_btrfs_kobj(kobj)); + u64 val; + int ret; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + if (!fs_info) { + pr_err("couldn't get fs_info\n"); + return -EPERM; + } + + if (sb_rdonly(fs_info->sb)) + return -EROFS; + + if (!fs_info->fs_devices) + return -EINVAL; + + if (btrfs_is_zoned(fs_info)) + return -EINVAL; + + if (!space_info) { + btrfs_err(fs_info, "couldn't get space_info\n"); + return -EPERM; + } + + /* System block type must not be changed. */ + if (space_info->flags & BTRFS_BLOCK_GROUP_SYSTEM) + return -EINVAL; + + ret = kstrtoull(buf, 10, &val); + if (ret) + return ret; + + val = min(val, BTRFS_MAX_DATA_CHUNK_SIZE); + + /* + * Limit stripe size to 10% of available space. + */ + val = min(div_factor(fs_info->fs_devices->total_rw_bytes, 1), val); + + /* Must be multiple of 256M. */ + val &= ~(SZ_256M - 1); + + /* Must be at least 256M. */ + if (val < SZ_256M) + return -EINVAL; + + btrfs_update_space_info_chunk_size(space_info, val); + + return val; +} + SPACE_INFO_ATTR(flags); SPACE_INFO_ATTR(total_bytes); SPACE_INFO_ATTR(bytes_used); @@ -718,6 +795,8 @@ SPACE_INFO_ATTR(bytes_readonly); SPACE_INFO_ATTR(bytes_zone_unusable); 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); /* * Allocation information about block group types. @@ -735,6 +814,7 @@ static struct attribute *space_info_attrs[] = { BTRFS_ATTR_PTR(space_info, bytes_zone_unusable), BTRFS_ATTR_PTR(space_info, disk_used), BTRFS_ATTR_PTR(space_info, disk_total), + BTRFS_ATTR_PTR(space_info, chunk_size), NULL, }; ATTRIBUTE_GROUPS(space_info); @@ -1099,6 +1179,20 @@ static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) return to_fs_devs(kobj)->fs_info; } +/* + * Get btrfs sysfs kobject. + */ +static inline struct kobject *get_btrfs_kobj(struct kobject *kobj) +{ + while (kobj) { + if (kobj->ktype == &btrfs_ktype) + return kobj; + kobj = kobj->parent; + } + + return NULL; +} + #define NUM_FEATURE_BITS 64 #define BTRFS_FEATURE_NAME_MAX 13 static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX];