From patchwork Mon Nov 4 11:26:21 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Kai_M=C3=A4kisara?= X-Patchwork-Id: 840724 Received: from fgw21-4.mail.saunalahti.fi (fgw21-4.mail.saunalahti.fi [62.142.5.108]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8FC211B0F1C for ; Mon, 4 Nov 2024 11:27:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=62.142.5.108 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730719676; cv=none; b=MC/l+p7C5ajC2AAws2xnj64YMiQ3vlP6m/W0oX8bYVUK1eTPYDymMsTvM3ti/7Ybi8uo1zLj0FuriEpyOcUO7t5Rof6n6Ko27wABvjwj9rd2ZyPrElfCL1lAO3ob6+cqGwqqO/3y7QdgTXd1vEO3LZR3UOJ7gJ0giNgAPOYIK6g= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730719676; c=relaxed/simple; bh=uLWXsjAY/qJfjcPXAHa2FsHQcyAA1xiTaMUlpn3gXWQ=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=VVLpDu4BxJ9BNmwXvY0km1/QJGV5HJCe9sM2b6r36i9jiqN4MAtHLoyK37WMSyeUsqixb/ewt814ul1o5BjCSXTOtTnreDyFDjHC8yJx2CCSD+YaLT9QwWHeBNQNZDzB7FU710mkBDSp+t8O6mFusRV2YUg2uFHcuTVKuTRk6w8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=kolumbus.fi; spf=pass smtp.mailfrom=kolumbus.fi; dkim=pass (2048-bit key) header.d=kolumbus.fi header.i=@kolumbus.fi header.b=p8CfUdWf; arc=none smtp.client-ip=62.142.5.108 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=kolumbus.fi Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kolumbus.fi Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kolumbus.fi header.i=@kolumbus.fi header.b="p8CfUdWf" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kolumbus.fi; s=elisa1; h=content-transfer-encoding:content-type:mime-version:message-id:date:subject: cc:to:from:from:to:cc:reply-to:subject:date:in-reply-to:references: list-archive:list-subscribe:list-unsubscribe:content-type: content-transfer-encoding:message-id; bh=UuIe0zaPSwBV+JJ2fESp3SXw6hBM8P0UFYlV080tmUI=; b=p8CfUdWfgB6LqclAyLvtgCMGaDK1VSXqkAydP2sPEDzqPzBNiBPcX/bfUifbmT/OWEDDKAQden2YE wV+ehheC4WkK7fWVlzcKIfENjrOndr61NzU0hqATMLZ9gP8dFPPLvF7p2lQjFz49xPzleUamPUIGi6 fhmJAn+MMFvWj4F0yFIaUU7Elr09tRZdr3jPOJDjlzkkw1A6olMqaGNBUoBIkIYMtAvW+s0xhbAAJp 6v+z7FAIL+/7Ax3p8pzTmfNWeo/uSgt+MPhfda7X5GlIRad8rym3bF5C3Vl6JBxqYDynJPJCcVf3H0 9UBqeFrriu4qEnNXL1ap3v36UkQnF9Q== Received: from kaipn1.makisara.private (85-156-116-90.elisa-laajakaista.fi [85.156.116.90]) by fgw21.mail.saunalahti.fi (Halon) with ESMTPSA id aa70ec24-9a9f-11ef-8872-005056bdd08f; Mon, 04 Nov 2024 13:26:42 +0200 (EET) From: =?utf-8?q?Kai_M=C3=A4kisara?= To: linux-scsi@vger.kernel.org, jmeneghi@redhat.com Cc: martin.petersen@oracle.com, James.Bottomley@HansenPartnership.com, loberman@redhat.com, =?utf-8?q?Kai_M=C3=A4kisara?= Subject: [PATCH 0/2] scsi: st: Device reset patches Date: Mon, 4 Nov 2024 13:26:21 +0200 Message-ID: <20241104112623.2675-1-Kai.Makisara@kolumbus.fi> X-Mailer: git-send-email 2.47.0 Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 These two patches were developed in response to Bugzilla report https://bugzilla.kernel.org/show_bug.cgi?id=219419 After device reset, the tape driver allows only operations tha don't write or read anything from tape. The reason for this is that many (most ?) drives rewind the tape after reset and the subsequent reads or writes would not be at the tape location the user expects. Reading and writing is allowed again when the user does something to position the tape (e.g., rewind). The Bugzilla report considers the case when a user, after reset, tries to read the drive status with MTIOCGET ioctl, but it fails. MTIOCGET does not return much useful data after reset, but it can be allowed. MTLOAD positions the tape and it should be allowed. The second patch adds these to the set of allowed operations after device reset. The first patch fixes a bug seen when developing the second patch. Kai Mäkisara (2): scsi: st: Don't modify unknown block number in MTIOCGET scsi: st: Add MTIOCGET and MTLOAD to ioctls allowed after device reset drivers/scsi/st.c | 31 ++++++++++++++++++++++--------- 1 file changed, 22 insertions(+), 9 deletions(-)