From patchwork Fri Feb 2 21:00:11 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mathieu Desnoyers X-Patchwork-Id: 13543441 Received: from smtpout.efficios.com (smtpout.efficios.com [167.114.26.122]) (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 9987812C800; Fri, 2 Feb 2024 21:00:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=167.114.26.122 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706907631; cv=none; b=TA/h7cd5i0b+KyqtV+/vHms2j3mEqDpm/5GIMcNHArcVIrRCDtRNVH2fifoU/AlldH8FFEM1VC2ygIsGMIPui7xgyv6k8BXQ7u0YGd4bvvcp3khO9LlHCC9ymc1J7m8k/6uIOLitW5nvY34IVLHHkYDdpBvW2FLCRlAqsaj2C+4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706907631; c=relaxed/simple; bh=NIplNKYnPiSxsRcYozD6/Em7BpOZVdeSTtUJ6fu0NbI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=bMV1HwlhRhtSglYeEZ+l6VAHUkP2eDG+OZUpmAxb1PlnOKBWhCV7wy+V00tq58++KvxJFhsmVkUd1PNccHRscf2zl0DAKUKsagQViJoXnZRmS6JLaTRQ2XXYIS4QCXWJ0VWYouo8IrYdTax/I/UgCPTwVI1Lctn1GPggNPc1Zl0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=efficios.com; spf=pass smtp.mailfrom=efficios.com; dkim=pass (2048-bit key) header.d=efficios.com header.i=@efficios.com header.b=uUAHHnSH; arc=none smtp.client-ip=167.114.26.122 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=efficios.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=efficios.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=efficios.com header.i=@efficios.com header.b="uUAHHnSH" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=efficios.com; s=smtpout1; t=1706907628; bh=NIplNKYnPiSxsRcYozD6/Em7BpOZVdeSTtUJ6fu0NbI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uUAHHnSH9qyqiPFbxwBtx0+D9xq4cbcOGLgW4N3moWcT7pudTHalnE5g1pd42JIw1 E3TN3gqn3EUKS2dS9BzMQmTDoF+b7/+Qo4cwDn0a2ByIW+HF+RdPmI8Gicr0hw2PC1 rvL4NM2lV7/3fJAgKuzVhmtLD4sYUctQymj+dRbaw03MRctwLcGdqytl4bAfkLRnmT 4zEaxXtJqlO+Duz6P4JaEGwtf4+/NJP0OjTM0KP4jY3eHJU+9XKKJK07j50wLLNsZI 5soy4VlB1L6a0Mfw3iWgCtncLHEZ7CxNE1IQAbBR3d217g1gnazmhpUoUCZ9XrHKcd Qr321w76PHugg== Received: from thinkos.internal.efficios.com (192-222-143-198.qc.cable.ebox.net [192.222.143.198]) by smtpout.efficios.com (Postfix) with ESMTPSA id 4TRSph2fcvzX4S; Fri, 2 Feb 2024 16:00:28 -0500 (EST) From: Mathieu Desnoyers To: Dan Williams , Arnd Bergmann , Dave Chinner Cc: linux-kernel@vger.kernel.org, Mathieu Desnoyers , Andrew Morton , Linus Torvalds , Vishal Verma , Dave Jiang , Matthew Wilcox , Russell King , linux-arch@vger.kernel.org, linux-cxl@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-xfs@vger.kernel.org, dm-devel@lists.linux.dev, nvdimm@lists.linux.dev, linux-s390@vger.kernel.org, Alasdair Kergon , Mike Snitzer , Mikulas Patocka Subject: [RFC PATCH v4 04/12] dcssblk: Handle alloc_dax() -EOPNOTSUPP failure Date: Fri, 2 Feb 2024 16:00:11 -0500 Message-Id: <20240202210019.88022-5-mathieu.desnoyers@efficios.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240202210019.88022-1-mathieu.desnoyers@efficios.com> References: <20240202210019.88022-1-mathieu.desnoyers@efficios.com> Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In preparation for checking whether the architecture has data cache aliasing within alloc_dax(), modify the error handling of dcssblk dcssblk_add_store() to handle alloc_dax() -EOPNOTSUPP failures. Considering that s390 is not a data cache aliasing architecture, and considering that DCSSBLK selects DAX, a return value of -EOPNOTSUPP from alloc_dax() should make dcssblk_add_store() fail. For the transition, consider that alloc_dax() returning NULL is the same as returning -EOPNOTSUPP. Fixes: d92576f1167c ("dax: does not work correctly with virtual aliasing caches") Signed-off-by: Mathieu Desnoyers Cc: Alasdair Kergon Cc: Mike Snitzer Cc: Mikulas Patocka Cc: Andrew Morton Cc: Linus Torvalds Cc: Dan Williams Cc: Vishal Verma Cc: Dave Jiang Cc: Matthew Wilcox Cc: Arnd Bergmann Cc: Russell King Cc: linux-arch@vger.kernel.org Cc: linux-cxl@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org Cc: linux-mm@kvack.org Cc: linux-xfs@vger.kernel.org Cc: dm-devel@lists.linux.dev Cc: nvdimm@lists.linux.dev Cc: linux-s390@vger.kernel.org --- drivers/s390/block/dcssblk.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c index 4b7ecd4fd431..a3010849bfed 100644 --- a/drivers/s390/block/dcssblk.c +++ b/drivers/s390/block/dcssblk.c @@ -549,6 +549,7 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char int rc, i, j, num_of_segments; struct dcssblk_dev_info *dev_info; struct segment_info *seg_info, *temp; + struct dax_device *dax_dev; char *local_buf; unsigned long seg_byte_size; @@ -677,13 +678,13 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char if (rc) goto put_dev; - dev_info->dax_dev = alloc_dax(dev_info, &dcssblk_dax_ops); - if (IS_ERR(dev_info->dax_dev)) { - rc = PTR_ERR(dev_info->dax_dev); - dev_info->dax_dev = NULL; + dax_dev = alloc_dax(dev_info, &dcssblk_dax_ops); + if (IS_ERR_OR_NULL(dax_dev)) { + rc = IS_ERR(dax_dev) ? PTR_ERR(dax_dev) : -EOPNOTSUPP; goto put_dev; } - set_dax_synchronous(dev_info->dax_dev); + set_dax_synchronous(dax_dev); + dev_info->dax_dev = dax_dev; rc = dax_add_host(dev_info->dax_dev, dev_info->gd); if (rc) goto out_dax;