From patchwork Thu Nov 19 14:16:57 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Weinberger X-Patchwork-Id: 11917587 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 42716C64E75 for ; Thu, 19 Nov 2020 14:27:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0E3C924199 for ; Thu, 19 Nov 2020 14:27:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727787AbgKSO1I (ORCPT ); Thu, 19 Nov 2020 09:27:08 -0500 Received: from lilium.sigma-star.at ([109.75.188.150]:58542 "EHLO lilium.sigma-star.at" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727387AbgKSO1G (ORCPT ); Thu, 19 Nov 2020 09:27:06 -0500 Received: from localhost (localhost [127.0.0.1]) by lilium.sigma-star.at (Postfix) with ESMTP id 987F6181C88E7; Thu, 19 Nov 2020 15:18:27 +0100 (CET) Received: from lilium.sigma-star.at ([127.0.0.1]) by localhost (lilium.sigma-star.at [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id vhznnC7JMG0k; Thu, 19 Nov 2020 15:18:26 +0100 (CET) Received: from lilium.sigma-star.at ([127.0.0.1]) by localhost (lilium.sigma-star.at [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id dDO3U2oTBdgd; Thu, 19 Nov 2020 15:18:26 +0100 (CET) From: Richard Weinberger To: miklos@szeredi.hu Cc: miquel.raynal@bootlin.com, vigneshr@ti.com, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org, Richard Weinberger Subject: [PATCH 3/5] fuse: Make cuse_parse_one a common helper Date: Thu, 19 Nov 2020 15:16:57 +0100 Message-Id: <20201119141659.26176-4-richard@nod.at> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201119141659.26176-1-richard@nod.at> References: <20201119141659.26176-1-richard@nod.at> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This function will be used by MUSE too, let's share it. Signed-off-by: Richard Weinberger --- fs/fuse/Kconfig | 4 +++ fs/fuse/Makefile | 1 + fs/fuse/cuse.c | 58 +---------------------------------------- fs/fuse/fuse_i.h | 3 +++ fs/fuse/helper.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 77 insertions(+), 57 deletions(-) create mode 100644 fs/fuse/helper.c diff --git a/fs/fuse/Kconfig b/fs/fuse/Kconfig index 40ce9a1c12e5..9c8cc1e7b3a5 100644 --- a/fs/fuse/Kconfig +++ b/fs/fuse/Kconfig @@ -18,9 +18,13 @@ config FUSE_FS If you want to develop a userspace FS, or if you want to use a filesystem based on FUSE, answer Y or M. +config FUSE_HELPER + def_bool n + config CUSE tristate "Character device in Userspace support" depends on FUSE_FS + select FUSE_HELPER help This FUSE extension allows character devices to be implemented in userspace. diff --git a/fs/fuse/Makefile b/fs/fuse/Makefile index 8c7021fb2cd4..7a5768cce6be 100644 --- a/fs/fuse/Makefile +++ b/fs/fuse/Makefile @@ -9,5 +9,6 @@ obj-$(CONFIG_VIRTIO_FS) += virtiofs.o fuse-y := dev.o dir.o file.o inode.o control.o xattr.o acl.o readdir.o fuse-$(CONFIG_FUSE_DAX) += dax.o +fuse-$(CONFIG_FUSE_HELPER) += helper.o virtiofs-y := virtio_fs.o diff --git a/fs/fuse/cuse.c b/fs/fuse/cuse.c index 55744430b0f0..24c015547130 100644 --- a/fs/fuse/cuse.c +++ b/fs/fuse/cuse.c @@ -199,62 +199,6 @@ struct cuse_devinfo { const char *name; }; -/** - * cuse_parse_one - parse one key=value pair - * @pp: i/o parameter for the current position - * @end: points to one past the end of the packed string - * @keyp: out parameter for key - * @valp: out parameter for value - * - * *@pp points to packed strings - "key0=val0\0key1=val1\0" which ends - * at @end - 1. This function parses one pair and set *@keyp to the - * start of the key and *@valp to the start of the value. Note that - * the original string is modified such that the key string is - * terminated with '\0'. *@pp is updated to point to the next string. - * - * RETURNS: - * 1 on successful parse, 0 on EOF, -errno on failure. - */ -static int cuse_parse_one(char **pp, char *end, char **keyp, char **valp) -{ - char *p = *pp; - char *key, *val; - - while (p < end && *p == '\0') - p++; - if (p == end) - return 0; - - if (end[-1] != '\0') { - pr_err("info not properly terminated\n"); - return -EINVAL; - } - - key = val = p; - p += strlen(p); - - if (valp) { - strsep(&val, "="); - if (!val) - val = key + strlen(key); - key = strstrip(key); - val = strstrip(val); - } else - key = strstrip(key); - - if (!strlen(key)) { - pr_err("zero length info key specified\n"); - return -EINVAL; - } - - *pp = p; - *keyp = key; - if (valp) - *valp = val; - - return 1; -} - /** * cuse_parse_dev_info - parse device info * @p: device info string @@ -275,7 +219,7 @@ static int cuse_parse_devinfo(char *p, size_t len, struct cuse_devinfo *devinfo) int rc; while (true) { - rc = cuse_parse_one(&p, end, &key, &val); + rc = fuse_kv_parse_one(&p, end, &key, &val); if (rc < 0) return rc; if (!rc) diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h index 637caddff2a8..d36c71568a80 100644 --- a/fs/fuse/fuse_i.h +++ b/fs/fuse/fuse_i.h @@ -1210,4 +1210,7 @@ void fuse_dax_inode_cleanup(struct inode *inode); bool fuse_dax_check_alignment(struct fuse_conn *fc, unsigned int map_alignment); void fuse_dax_cancel_work(struct fuse_conn *fc); +/* helper.c */ +int fuse_kv_parse_one(char **pp, char *end, char **keyp, char **valp); + #endif /* _FS_FUSE_I_H */ diff --git a/fs/fuse/helper.c b/fs/fuse/helper.c new file mode 100644 index 000000000000..35d37338445e --- /dev/null +++ b/fs/fuse/helper.c @@ -0,0 +1,68 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Helper functions used by CUSE and MUSE + * + * Copyright (C) 2008-2009 SUSE Linux Products GmbH + * Copyright (C) 2008-2009 Tejun Heo + * + */ + +#include +#include + +/** + * fuse_kv_parse_one - parse one key=value pair + * @pp: i/o parameter for the current position + * @end: points to one past the end of the packed string + * @keyp: out parameter for key + * @valp: out parameter for value + * + * *@pp points to packed strings - "key0=val0\0key1=val1\0" which ends + * at @end - 1. This function parses one pair and set *@keyp to the + * start of the key and *@valp to the start of the value. Note that + * the original string is modified such that the key string is + * terminated with '\0'. *@pp is updated to point to the next string. + * + * RETURNS: + * 1 on successful parse, 0 on EOF, -errno on failure. + */ +int fuse_kv_parse_one(char **pp, char *end, char **keyp, char **valp) +{ + char *p = *pp; + char *key, *val; + + while (p < end && *p == '\0') + p++; + if (p == end) + return 0; + + if (end[-1] != '\0') { + pr_err("info not properly terminated\n"); + return -EINVAL; + } + + key = val = p; + p += strlen(p); + + if (valp) { + strsep(&val, "="); + if (!val) + val = key + strlen(key); + key = strstrip(key); + val = strstrip(val); + } else + key = strstrip(key); + + if (!strlen(key)) { + pr_err("zero length info key specified\n"); + return -EINVAL; + } + + *pp = p; + *keyp = key; + if (valp) + *valp = val; + + return 1; +} +EXPORT_SYMBOL_GPL(fuse_kv_parse_one);