Commit dea2ab46 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by ZhangPeng
Browse files

block: add a partscan sysfs attribute for disks 

stable inclusion
from stable-v6.6.32
commit 3ffef551160a073bc852d7b7cfd26a635e63db34
bugzilla: https://gitee.com/openeuler/kernel/issues/IA4MGD

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=3ffef551160a073bc852d7b7cfd26a635e63db34



--------------------------------

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: default avatarChristoph Hellwig <hch@lst.de>
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: default avatarJens Axboe <axboe@kernel.dk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarZhangPeng <zhangpeng362@huawei.com>
parent 785f27b6

Documentation/ABI/stable/sysfs-block

+10 −0
Original line number Diff line number Diff line
@@ -101,6 +101,16 @@ Description: 
		devices that support receiving integrity metadata.





What:		/sys/block/<disk>/partscan

Date:		May 2024

Contact:	Christoph Hellwig <hch@lst.de>

Description:

		The /sys/block/<disk>/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/<disk>/<partition>/alignment_offset

Date:		April 2009

Contact:	Martin K. Petersen <martin.petersen@oracle.com>

block/genhd.c

+8 −0
Original line number Diff line number Diff line
@@ -1037,6 +1037,12 @@ static ssize_t diskseq_show(struct device *dev, 
	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);
@@ -1050,6 +1056,7 @@ static DEVICE_ATTR(stat, 0444, part_stat_show, NULL); 
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,
@@ -1096,6 +1103,7 @@ 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