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Subject[PATCH 016 of 29] md: Make sure all changes to md/degraded are notified.

When a device fails, when a spare is activated, when
an array is reshaped, or when an array is started,
the extent to which the array is degraded can change.

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

### Diffstat output
./Documentation/md.txt | 7 +++++++
./drivers/md/md.c | 6 +++++-
2 files changed, 12 insertions(+), 1 deletion(-)
diff .prev/Documentation/md.txt ./Documentation/md.txt
--- .prev/Documentation/md.txt 2008-06-27 16:22:02.000000000 +1000
+++ ./Documentation/md.txt 2008-06-27 16:22:02.000000000 +1000
@@ -392,6 +392,13 @@ also have
achieved. In that case, the transition to "recover" isn't
notified, but the transition away is.

+ degraded
+ This contains a count of the number of devices by which the
+ arrays is degraded. So an optimal array with show '0'. A
+ single failed/missing drive will show '1', etc.
+ This file responds to select/poll, any increase or decrease
+ in the count of missing devices will trigger an event.
+
mismatch_count
When performing 'check' and 'repair', and possibly when
performing 'resync', md will count the number of errors that are
diff .prev/drivers/md/md.c ./drivers/md/md.c
--- .prev/drivers/md/md.c 2008-06-27 16:22:02.000000000 +1000
+++ ./drivers/md/md.c 2008-06-27 16:22:02.000000000 +1000
@@ -2969,6 +2969,7 @@ action_store(mddev_t *mddev, const char
err = mddev->pers->start_reshape(mddev);
if (err)
return err;
+ sysfs_notify(&mddev->kobj, NULL, "degraded");
} else {
if (cmd_match(page, "check"))
set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
@@ -3686,6 +3687,7 @@ static int do_md_run(mddev_t * mddev)
md_new_event(mddev);
sysfs_notify(&mddev->kobj, NULL, "array_state");
sysfs_notify(&mddev->kobj, NULL, "sync_action");
+ sysfs_notify(&mddev->kobj, NULL, "degraded");
kobject_uevent(&mddev->gendisk->dev.kobj, KOBJ_CHANGE);
return 0;
}
@@ -6049,7 +6051,9 @@ void md_check_recovery(mddev_t *mddev)
if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
/* success...*/
/* activate any spares */
- mddev->pers->spare_active(mddev);
+ if (mddev->pers->spare_active(mddev))
+ sysfs_notify(&mddev->kobj, NULL,
+ "degraded");
}
md_update_sb(mddev, 1);


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