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Fri, 24 Jul 2020 13:25:42 +0000 (UTC) Received: from localhost.localdomain.com (unknown [10.36.110.43]) by smtp.corp.redhat.com (Postfix) with ESMTP id A3E1C101E1BF; Fri, 24 Jul 2020 13:25:36 +0000 (UTC) From: =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= To: qemu-devel@nongnu.org Subject: [PATCH v3 3/4] util: give a specific error message when O_DIRECT doesn't work Date: Fri, 24 Jul 2020 14:25:09 +0100 Message-Id: <20200724132510.3250311-4-berrange@redhat.com> In-Reply-To: <20200724132510.3250311-1-berrange@redhat.com> References: <20200724132510.3250311-1-berrange@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=207.211.31.81; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/24 00:00:27 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=unavailable autolearn_force=no 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_P=2E_Berrang=C3=A9?= , qemu-block@nongnu.org, =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Markus Armbruster , Max Reitz Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" A common error scenario is to tell QEMU to use O_DIRECT in combination with a filesystem that doesn't support it. To aid users to diagnosing their mistake we want to provide a clear error message when this happens. Signed-off-by: Daniel P. Berrangé --- util/osdep.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/util/osdep.c b/util/osdep.c index 5c0f4684b1..ac3e7f48f1 100644 --- a/util/osdep.c +++ b/util/osdep.c @@ -348,6 +348,19 @@ qemu_open_internal(const char *name, int flags, mode_t mode, Error **errp) if (flags & O_CREAT) { action = "create"; } +#ifdef O_DIRECT + if (errno == EINVAL && (flags & O_DIRECT)) { + ret = open(name, flags & ~O_DIRECT, mode); + if (ret != -1) { + close(ret); + error_setg(errp, "Could not %s '%s' flags 0x%x: " + "filesystem does not support O_DIRECT", + action, name, flags); + errno = EINVAL; /* close() clobbered earlier errno */ + return -1; + } + } +#endif /* O_DIRECT */ error_setg_errno(errp, errno, "Could not %s '%s' flags 0x%x", action, name, flags); }