From d7f3d291a0e1330f341fdf1128b2d12fff7932ee Mon Sep 17 00:00:00 2001 From: Iustin Pop Date: Tue, 16 Oct 2007 23:30:54 -0700 Subject: [PATCH] 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: Iustin Pop Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/md/md.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/md/md.c b/drivers/md/md.c index 510625e3a96..c059ae6f37e 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -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 = {