From patchwork Wed Nov 6 09:57:20 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: 841665 Received: from fgw20-4.mail.saunalahti.fi (fgw20-4.mail.saunalahti.fi [62.142.5.107]) (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 05E63186E26 for ; Wed, 6 Nov 2024 09:57:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=62.142.5.107 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730887075; cv=none; b=ROo5TryYbWBowETHadjHMQLfi4qFHSDobAJc8T744ZupL2RHuQoj1mlh6trSh4MOcC4HBF8cq9jIZfyO1q569DouWrUUqXamNhJJPL4XMLViUETWOeydJ0w/RrOttOv9naq8ZVz1ddqCDJJGf3TWR6ySWWEcqkRH0o3+EOrtiWs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730887075; c=relaxed/simple; bh=RWXAs+xGbv96ovhcDjbgWYW8lDg5HT3I6al9RGvKeN4=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=EtwgScyvm7xt0//s6DI16A+Rhh752ZZz+llQFTl0IRA60X9fOf85qdkarnbiBWMinku+68hRwu7IZv+0CXh3qDgAe1nhNMQcEo+ehviXSyJCCJT2xZWM794/SYfIJWk13vNEuKp3EqegSLk6N7tLQbw4KImaPoW+PKnKH+lgn1s= 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=uCZjOXmU; arc=none smtp.client-ip=62.142.5.107 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="uCZjOXmU" 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=oYl0x9Rl9hcbJkhmfBZBYdFIqz6Jf29TOVeF86M13+o=; b=uCZjOXmUK4KMbI7uqv/la6jzq9klc7ix0MSJpEaugisGLBLz/Nz+2zJgMhk00lN88+2VdI4n8GMH8 FIM6OGwsPAA0EQeLr3pVsHxE9tONURSPodV4bcb0FizFSaz9v5GVjTb63csn5vA9RUt9mwkJbrTtTu KbeqCs/SIdkt9lmV76LfU4K1TrMW8xc+o30jzdD4rKuS2VDPfd2KX5Y/w4ldVDND+ML+V8D7oKhKgf uIESENyCjqDK39Tvc3Tgx+6Fe/y3deNVIhm2kzgmvL3mQTtAFSuuKezwf5jAT63id0bZ3Iplv99xhN lZ2aDKRYccaqU9+bJ5/EZTgKMp0Plpg== Received: from kaipn1.makisara.private (85-156-116-90.elisa-laajakaista.fi [85.156.116.90]) by fgw20.mail.saunalahti.fi (Halon) with ESMTPSA id 8f38091f-9c25-11ef-9ac8-005056bd6ce9; Wed, 06 Nov 2024 11:57:40 +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 v2 0/3] scsi: st: Device reset patches Date: Wed, 6 Nov 2024 11:57:20 +0200 Message-ID: <20241106095723.63254-1-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 three 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. V2: The third patch is added to fix a bug that resulted in not blocking writes if reset occurs while the device file is not open. Kai Mäkisara (3): scsi: st: Don't modify unknown block number in MTIOCGET scsi: st: Add MTIOCGET and MTLOAD to ioctls allowed after device reset scsi: st: New session only when Unit Attention for new tape drivers/scsi/st.c | 36 ++++++++++++++++++++++++++---------- 1 file changed, 26 insertions(+), 10 deletions(-)