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[212.96.48.140]) by smtp.gmail.com with ESMTPSA id 11sm1837513wmd.23.2019.06.19.05.30.33 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Wed, 19 Jun 2019 05:30:33 -0700 (PDT) From: Miklos Szeredi To: David Howells Cc: Al Viro , Ian Kent , linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 06/13] vfs: new helper: vfs_parse_ro_rw() Date: Wed, 19 Jun 2019 14:30:12 +0200 Message-Id: <20190619123019.30032-6-mszeredi@redhat.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190619123019.30032-1-mszeredi@redhat.com> References: <20190619123019.30032-1-mszeredi@redhat.com> MIME-Version: 1.0 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 This just parses the "ro" and "rw" options and sets sb_flags accordingly. Signed-off-by: Miklos Szeredi --- fs/fs_context.c | 18 ++++++++++++++++++ include/linux/fs_context.h | 1 + 2 files changed, 19 insertions(+) diff --git a/fs/fs_context.c b/fs/fs_context.c index c26b353aa858..5012ab7650ec 100644 --- a/fs/fs_context.c +++ b/fs/fs_context.c @@ -77,6 +77,24 @@ int vfs_parse_sb_flag(struct fs_context *fc, struct fs_parameter *param) } EXPORT_SYMBOL(vfs_parse_sb_flag); +int vfs_parse_ro_rw(struct fs_context *fc, struct fs_parameter *param) +{ + if (strcmp(param->key, "ro") == 0) + fc->sb_flags |= SB_RDONLY; + else if (strcmp(param->key, "rw") == 0) + fc->sb_flags &= ~SB_RDONLY; + else + return -ENOPARAM; + + if (param->type != fs_value_is_flag) + return invalf(fc, "%s: Unexpected value for '%s'", + fc->fs_type->name, param->key); + + fc->sb_flags_mask |= SB_RDONLY; + return 0; +} +EXPORT_SYMBOL(vfs_parse_ro_rw); + /** * vfs_parse_fs_param - Add a single parameter to a superblock config * @fc: The filesystem context to modify diff --git a/include/linux/fs_context.h b/include/linux/fs_context.h index 39f4d8b0a390..bff6796a89ef 100644 --- a/include/linux/fs_context.h +++ b/include/linux/fs_context.h @@ -128,6 +128,7 @@ extern struct fs_context *fs_context_for_submount(struct file_system_type *fs_ty extern struct fs_context *vfs_dup_fs_context(struct fs_context *fc); extern int vfs_parse_sb_flag(struct fs_context *fc, struct fs_parameter *param); +extern int vfs_parse_ro_rw(struct fs_context *fc, struct fs_parameter *param); extern int vfs_parse_fs_param(struct fs_context *fc, struct fs_parameter *param); extern int vfs_parse_fs_string(struct fs_context *fc, const char *key, const char *value, size_t v_size);