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

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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>
This commit is contained in:
Iustin Pop 2007-10-16 23:30:54 -07:00 committed by Linus Torvalds
parent 2b12ab6d33
commit d7f3d291a0
1 changed files with 7 additions and 0 deletions
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7
drivers/md/md.c
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@ -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 = {