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block: add a partscan sysfs attribute for disks 

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: 140ce28dd3 ("block: add a disk_has_partscan helper")
Signed-off-by: Christoph 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: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2024-05-02 15:00:33 +02:00 committed by Jens Axboe
parent 140ce28dd3
commit a4217c6740
2 changed files with 18 additions and 0 deletions
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10
Documentation/ABI/stable/sysfs-block
View File

@ -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>

8
block/genhd.c
View File

@ -1044,6 +1044,12 @@ 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);
@ -1057,6 +1063,7 @@ 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,
@ -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