From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 4482614B09F; Thu, 23 May 2024 13:22:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716470553; cv=none; b=V0BnBQT0pm18QfaFqyeLNtARqizSHU0Br82FpETL7/xvdBxuBBq7vAe13hex5x1A+HG2RQBvdAs/+5MiM0jdbjNcI4pMr0VwuGpF+UeqGOG+/fZqUBiQPS4Y6OlhPSOfvJRKnwlc02H4eImc3Zczr9KVJRdnxQnvhqMI/SYPy0o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716470553; c=relaxed/simple; bh=kTlUWzVY37SYag5o8RJwmh4RTeKBU6GHpcq7jLjg170=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=h0zA5nQwzhI4E2O4xexVe2YZgPFA4GtD+bfRkaaiFXXTCWvWvPzN11Me4ePMKeWHztddixyple1+T4vGMibN7nXcylvd2HUifr4v9W/boQbN6osn2AvWwMtysxrBuuHgwufbl35pPLpXl3YtPHC+EEe6PvGB4QNVok5x8diLcD8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=wHaMRvdY; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="wHaMRvdY" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BBFD3C3277B; Thu, 23 May 2024 13:22:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1716470553; bh=kTlUWzVY37SYag5o8RJwmh4RTeKBU6GHpcq7jLjg170=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wHaMRvdYyvY0Hmb1HpWiu4M6xgdDfQRK46Dy7XNAusrCR6tFePWGhjVtxg/arZnAM Ky2/n93JqZfu9ByAMKRcxaOLxmiEqekJYCeIdbXaEYsibgLw/jfPcPj28oYd9sJdYx mEtGESXsWPsDdxGfmrxWE9uoGzy9qKqbDEWFLYss= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Christoph Hellwig , Jens Axboe Subject: [PATCH 6.8 23/23] block: add a partscan sysfs attribute for disks Date: Thu, 23 May 2024 15:13:50 +0200 Message-ID: <20240523130330.625704586@linuxfoundation.org> X-Mailer: git-send-email 2.45.1 In-Reply-To: <20240523130329.745905823@linuxfoundation.org> References: <20240523130329.745905823@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.8-stable review patch. If anyone has any objections, please let me know. ------------------ From: Christoph Hellwig commit a4217c6740dc64a3eb6815868a9260825e8c68c6 upstream. Userspace had been unknowingly relying on a non-stable interface of kernel internals to determine if partition scanning is enabled for a given disk. Provide a stable interface for this purpose instead. Cc: stable@vger.kernel.org # 6.3+ Depends-on: 140ce28dd3be ("block: add a disk_has_partscan helper") Signed-off-by: Christoph Hellwig Link: https://lore.kernel.org/linux-block/ZhQJf8mzq_wipkBH@gardel-login/ Link: https://lore.kernel.org/r/20240502130033.1958492-3-hch@lst.de [axboe: add links and commit message from Keith] Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- Documentation/ABI/stable/sysfs-block | 10 ++++++++++ block/genhd.c | 8 ++++++++ 2 files changed, 18 insertions(+) --- a/Documentation/ABI/stable/sysfs-block +++ b/Documentation/ABI/stable/sysfs-block @@ -101,6 +101,16 @@ Description: devices that support receiving integrity metadata. +What: /sys/block//partscan +Date: May 2024 +Contact: Christoph Hellwig +Description: + The /sys/block//partscan files reports if partition + scanning is enabled for the disk. It returns "1" if partition + scanning is enabled, or "0" if not. The value type is a 32-bit + unsigned integer, but only "0" and "1" are valid values. + + What: /sys/block///alignment_offset Date: April 2009 Contact: Martin K. Petersen --- a/block/genhd.c +++ b/block/genhd.c @@ -1044,6 +1044,12 @@ static ssize_t diskseq_show(struct devic return sprintf(buf, "%llu\n", disk->diskseq); } +static ssize_t partscan_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%u\n", disk_has_partscan(dev_to_disk(dev))); +} + static DEVICE_ATTR(range, 0444, disk_range_show, NULL); static DEVICE_ATTR(ext_range, 0444, disk_ext_range_show, NULL); static DEVICE_ATTR(removable, 0444, disk_removable_show, NULL); @@ -1057,6 +1063,7 @@ static DEVICE_ATTR(stat, 0444, part_stat static DEVICE_ATTR(inflight, 0444, part_inflight_show, NULL); static DEVICE_ATTR(badblocks, 0644, disk_badblocks_show, disk_badblocks_store); static DEVICE_ATTR(diskseq, 0444, diskseq_show, NULL); +static DEVICE_ATTR(partscan, 0444, partscan_show, NULL); #ifdef CONFIG_FAIL_MAKE_REQUEST ssize_t part_fail_show(struct device *dev, @@ -1103,6 +1110,7 @@ static struct attribute *disk_attrs[] = &dev_attr_events_async.attr, &dev_attr_events_poll_msecs.attr, &dev_attr_diskseq.attr, + &dev_attr_partscan.attr, #ifdef CONFIG_FAIL_MAKE_REQUEST &dev_attr_fail.attr, #endif