[PATCH 2/2] block: add a partscan sysfs attribute for disks

Christoph Hellwig
2024-04-29T17:49:08Z

This attribute reports if partition scanning is enabled for a given disk.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
Documentation/ABI/stable/sysfs-block | 10 ++++++++++
block/genhd.c | 8 ++++++++
2 files changed, 18 insertions(+)

diff --git a/Documentation/ABI/stable/sysfs-block b/Documentation/ABI/stable/sysfs-block
index 1fe9a553c37b71..db58fdcdff31b0 100644
--- 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/<disk>/partscan
+Date: Atorl 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>
diff --git a/block/genhd.c b/block/genhd.c
index 4b85963d09dbb4..dec2ee338fb44a 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -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
--
2.39.2