From patchwork Mon Oct 21 21:19:45 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Mahoney X-Patchwork-Id: 3079601 Return-Path: X-Original-To: patchwork-linux-btrfs@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id A37F89F372 for ; Mon, 21 Oct 2013 21:20:49 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id C05462026F for ; Mon, 21 Oct 2013 21:20:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9CCD7203E9 for ; Mon, 21 Oct 2013 21:20:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752460Ab3JUVUq (ORCPT ); Mon, 21 Oct 2013 17:20:46 -0400 Received: from cantor2.suse.de ([195.135.220.15]:46366 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752262Ab3JUVUm (ORCPT ); Mon, 21 Oct 2013 17:20:42 -0400 Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 0DD2BA6450 for ; Mon, 21 Oct 2013 23:20:40 +0200 (CEST) Message-Id: <20131021212007.081294100@suse.com> User-Agent: quilt/0.60-5.1.1 Date: Mon, 21 Oct 2013 17:19:45 -0400 From: Jeff Mahoney To: linux-btrfs@vger.kernel.org Cc: dsterba@suse.com Subject: [patch 05/13] btrfs: publish per-super features in sysfs References: <20131021211940.432195222@suse.com> Content-Disposition: inline; filename=patches.suse/btrfs-publish-per-super-features-in-sysfs Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Spam-Status: No, score=-7.3 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch publishes information on which features are enabled in the file system on a per-super basis. At this point, it only publishes information on features supported by the file system implementation. Signed-off-by: Jeff Mahoney --- fs/btrfs/sysfs.c | 81 ++++++++++++++++++++++++++++++++++++++++++++----------- 1 file changed, 65 insertions(+), 16 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html --- a/fs/btrfs/sysfs.c 2013-10-21 16:10:00.216037635 -0400 +++ b/fs/btrfs/sysfs.c 2013-10-21 16:10:00.700027002 -0400 @@ -28,29 +28,53 @@ #include "transaction.h" #include "sysfs.h" -static void btrfs_release_super_kobj(struct kobject *kobj); -static struct kobj_type btrfs_ktype = { - .sysfs_ops = &kobj_sysfs_ops, - .release = btrfs_release_super_kobj, -}; +static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); -static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) +static u64 get_features(struct btrfs_fs_info *fs_info, + enum btrfs_feature_set set) { - if (kobj->ktype != &btrfs_ktype) - return NULL; - return container_of(kobj, struct btrfs_fs_info, super_kobj); + struct btrfs_super_block *disk_super = fs_info->super_copy; + if (set == FEAT_COMPAT) + return btrfs_super_compat_flags(disk_super); + else if (set == FEAT_COMPAT_RO) + return btrfs_super_compat_ro_flags(disk_super); + else + return btrfs_super_incompat_flags(disk_super); } -static void btrfs_release_super_kobj(struct kobject *kobj) +static ssize_t btrfs_feature_attr_show(struct kobject *kobj, + struct kobj_attribute *a, char *buf) { + int val = 0; struct btrfs_fs_info *fs_info = to_fs_info(kobj); - complete(&fs_info->kobj_unregister); + if (fs_info) { + struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); + u64 features = get_features(fs_info, fa->feature_set); + if (features & fa->feature_bit) + val = 1; + } + + return snprintf(buf, PAGE_SIZE, "%d\n", val); } -static ssize_t btrfs_feature_attr_show(struct kobject *kobj, - struct kobj_attribute *a, char *buf) +static umode_t btrfs_feature_visible(struct kobject *kobj, + struct attribute *attr, int unused) { - return snprintf(buf, PAGE_SIZE, "0\n"); + struct btrfs_fs_info *fs_info = to_fs_info(kobj); + umode_t mode = attr->mode; + + if (fs_info) { + struct btrfs_feature_attr *fa; + u64 features; + + fa = attr_to_btrfs_feature_attr(attr); + features = get_features(fs_info, fa->feature_set); + + if (!(features & fa->feature_bit)) + mode = 0; + } + + return mode; } BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF); @@ -78,11 +102,27 @@ static struct attribute *btrfs_supported static const struct attribute_group btrfs_feature_attr_group = { .name = "features", + .is_visible = btrfs_feature_visible, .attrs = btrfs_supported_feature_attrs, }; -/* /sys/fs/btrfs/ entry */ -static struct kset *btrfs_kset; +static void btrfs_release_super_kobj(struct kobject *kobj) +{ + struct btrfs_fs_info *fs_info = to_fs_info(kobj); + complete(&fs_info->kobj_unregister); +} + +static struct kobj_type btrfs_ktype = { + .sysfs_ops = &kobj_sysfs_ops, + .release = btrfs_release_super_kobj, +}; + +static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) +{ + if (kobj->ktype != &btrfs_ktype) + return NULL; + return container_of(kobj, struct btrfs_fs_info, super_kobj); +} void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) { @@ -91,13 +131,22 @@ void btrfs_sysfs_remove_one(struct btrfs wait_for_completion(&fs_info->kobj_unregister); } +/* /sys/fs/btrfs/ entry */ +static struct kset *btrfs_kset; + int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info) { int error; init_completion(&fs_info->kobj_unregister); + fs_info->super_kobj.kset = btrfs_kset; error = kobject_init_and_add(&fs_info->super_kobj, &btrfs_ktype, NULL, "%pU", fs_info->fsid); + + error = sysfs_create_group(&fs_info->super_kobj, + &btrfs_feature_attr_group); + if (error) + btrfs_sysfs_remove_one(fs_info); return error; }