From patchwork Mon Jun 24 14:12:25 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 11013305 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 80A2F924 for ; Mon, 24 Jun 2019 14:12:34 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6DE9B271CB for ; Mon, 24 Jun 2019 14:12:34 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6C37E28BCF; Mon, 24 Jun 2019 14:12:34 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1056128BDC for ; Mon, 24 Jun 2019 14:12:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727344AbfFXOM3 (ORCPT ); Mon, 24 Jun 2019 10:12:29 -0400 Received: from mx1.redhat.com ([209.132.183.28]:54544 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725881AbfFXOM3 (ORCPT ); Mon, 24 Jun 2019 10:12:29 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id BB2CD3087946; Mon, 24 Jun 2019 14:12:28 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-120-57.rdu2.redhat.com [10.10.120.57]) by smtp.corp.redhat.com (Postfix) with ESMTP id 51D3A5C21F; Mon, 24 Jun 2019 14:12:26 +0000 (UTC) Organization: Red Hat UK Ltd. 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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 25/25] fsinfo: ufs - add sb operation fsinfo() [ver #14] From: David Howells To: viro@zeniv.linux.org.uk Cc: dhowells@redhat.com, raven@themaw.net, mszeredi@redhat.com, linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Date: Mon, 24 Jun 2019 15:12:25 +0100 Message-ID: <156138554552.25627.15667264043714854814.stgit@warthog.procyon.org.uk> In-Reply-To: <156138532485.25627.7459410522109581052.stgit@warthog.procyon.org.uk> References: <156138532485.25627.7459410522109581052.stgit@warthog.procyon.org.uk> User-Agent: StGit/unknown-version MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.45]); Mon, 24 Jun 2019 14:12:28 +0000 (UTC) Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Ian Kent The new fsinfo() system call adds a new super block operation ->fsinfo() which is used by file systems to provide file system specific information for fsinfo() requests. The fsinfo() request FSINFO_ATTR_PARAMETERS provides the same function as sb operation ->show_options() so it needs to be implemented by any file system that provides ->show_options() as a minimum. Signed-off-by: Ian Kent Signed-off-by: David Howells --- fs/ufs/super.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) diff --git a/fs/ufs/super.c b/fs/ufs/super.c index 84c0c5178cd2..40a3e9db8ac7 100644 --- a/fs/ufs/super.c +++ b/fs/ufs/super.c @@ -89,6 +89,7 @@ #include #include #include +#include #include "ufs_fs.h" #include "ufs.h" @@ -1401,6 +1402,60 @@ static int ufs_show_options(struct seq_file *seq, struct dentry *root) return 0; } +#ifdef CONFIG_FSINFO +static int ufs_fsinfo_print_token(struct fsinfo_kparams *params, const char *token) +{ + char *new, *key, *value; + + new = kstrdup(token, GFP_KERNEL); + if (!new) + return -ENOMEM; + + key = new; + value = strchr(new, '='); + if (value) + *value++ = '\0'; + + fsinfo_note_param(params, key, value); + + kfree(new); + return 0; +} + +/* + * Get filesystem information. + */ +static int ufs_fsinfo(struct path *path, struct fsinfo_kparams *params) +{ + struct ufs_sb_info *sbi = UFS_SB(path->dentry->d_sb); + unsigned mval = sbi->s_mount_opt & UFS_MOUNT_UFSTYPE; + const struct match_token *tp = tokens; + int ret; + + switch (params->request) { + case FSINFO_ATTR_PARAMETERS: + fsinfo_note_sb_params(params, path->dentry->d_sb->s_flags); + while (tp->token != Opt_onerror_panic && tp->token != mval) + ++tp; + BUG_ON(tp->token == Opt_onerror_panic); + ret = ufs_fsinfo_print_token(params, tp->pattern); + if (ret) + return ret; + mval = sbi->s_mount_opt & UFS_MOUNT_ONERROR; + while (tp->token != Opt_err && tp->token != mval) + ++tp; + BUG_ON(tp->token == Opt_err); + ret = ufs_fsinfo_print_token(params, tp->pattern); + if (ret) + return ret; + return params->usage; + + default: + return generic_fsinfo(path, params); + } +} +#endif /* CONFIG_FSINFO */ + static int ufs_statfs(struct dentry *dentry, struct kstatfs *buf) { struct super_block *sb = dentry->d_sb; @@ -1496,6 +1551,9 @@ static const struct super_operations ufs_super_ops = { .statfs = ufs_statfs, .remount_fs = ufs_remount, .show_options = ufs_show_options, +#ifdef CONFIG_FSINFO + .fsinfo = ufs_fsinfo, +#endif }; static struct dentry *ufs_mount(struct file_system_type *fs_type,