md: expose the degraded status of an assembled array through sysfs (d7f3d291) · Commits · 戴 / test

The 'degraded' attribute is useful to quickly determine if the array is degraded, instead of parsing 'mdadm -D' output or relying on the other techniques (number of working devices against number of defined devices, etc.). The md code already keeps track of this attribute, so it's useful to export it. Signed-off-by:

Iustin Pop <iusty@k1024.org> Signed-off-by:

Neil Brown <neilb@suse.de> Signed-off-by:

Andrew Morton <akpm@linux-foundation.org> Signed-off-by:

Linus Torvalds <torvalds@linux-foundation.org>

drivers/md/md.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -2833,6 +2833,12 @@ sync_max_store(mddev_t mddev, const char buf, size_t len)
		static struct md_sysfs_entry md_sync_max =
		__ATTR(sync_speed_max, S_IRUGO\|S_IWUSR, sync_max_show, sync_max_store);

		static ssize_t
		degraded_show(mddev_t mddev, char page)
		{
		return sprintf(page, "%d\n", mddev->degraded);
		}
		static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);

		static ssize_t
		sync_speed_show(mddev_t mddev, char page)
		@@ -2976,6 +2982,7 @@ static struct attribute *md_redundancy_attrs[] = {
		&md_suspend_lo.attr,
		&md_suspend_hi.attr,
		&md_bitmap.attr,
		&md_degraded.attr,
		NULL,
		};
		static struct attribute_group md_redundancy_group = {

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