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Thu, 2 Jul 2020 12:56:15 +0000 (UTC) From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= To: qemu-devel@nongnu.org Subject: [PATCH v2 1/3] util: validate whether O_DIRECT is supported after failure Date: Thu, 2 Jul 2020 13:56:10 +0100 Message-Id: <20200702125612.2176194-2-berrange@redhat.com> In-Reply-To: <20200702125612.2176194-1-berrange@redhat.com> References: <20200702125612.2176194-1-berrange@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=berrange@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=205.139.110.61; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/02 03:42:59 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , qemu-block@nongnu.org, Markus Armbruster , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , P J P , Max Reitz Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Currently we suggest that a filesystem may not support O_DIRECT after seeing an EINVAL. Other things can cause EINVAL though, so it is better to do an explicit check, and then report a definitive error message. Signed-off-by: Daniel P. Berrangé --- util/osdep.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/util/osdep.c b/util/osdep.c index 4829c07ff6..e2b7507ee2 100644 --- a/util/osdep.c +++ b/util/osdep.c @@ -332,9 +332,11 @@ int qemu_open(const char *name, int flags, ...) } #ifdef O_CLOEXEC - ret = open(name, flags | O_CLOEXEC, mode); -#else + flags |= O_CLOEXEC; +#endif ret = open(name, flags, mode); + +#ifndef O_CLOEXEC if (ret >= 0) { qemu_set_cloexec(ret); } @@ -342,8 +344,13 @@ int qemu_open(const char *name, int flags, ...) #ifdef O_DIRECT if (ret == -1 && errno == EINVAL && (flags & O_DIRECT)) { - error_report("file system may not support O_DIRECT"); - errno = EINVAL; /* in case it was clobbered */ + int newflags = flags & ~O_DIRECT; + ret = open(name, newflags, mode); + if (ret != -1) { + close(ret); + error_report("file system does not support O_DIRECT"); + errno = EINVAL; + } } #endif /* O_DIRECT */ -- 2.26.2