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Commit d7f3d291 authored by Iustin Pop's avatar Iustin Pop Committed by Linus Torvalds
Browse files

md: expose the degraded status of an assembled array through sysfs 



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: default avatarIustin Pop <iusty@k1024.org>
Signed-off-by: default avatarNeil Brown <neilb@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 2b12ab6d

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 = {