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authorChristoph Hellwig <hch@lst.de>2024-05-02 15:00:33 +0200
committerJens Axboe <axboe@kernel.dk>2024-05-03 09:00:07 -0600
commita4217c6740dc64a3eb6815868a9260825e8c68c6 (patch)
treeac4fd5788f1296cb88329bd6ef2595b269711328 /block/genhd.c
parent140ce28dd3bee8e53acc27f123ae474d69ef66f0 (diff)
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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: 140ce28dd3be ("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>
Diffstat (limited to 'block/genhd.c')
-rw-r--r--block/genhd.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/block/genhd.c b/block/genhd.c
index 4b85963d09db..dec2ee338fb4 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