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Commit 52664732 authored by Neil Brown's avatar Neil Brown
Browse files

Make sure all changes to md/dev-XX/state are notified 



The important state change happens during an interrupt
in md_error.  So just set a flag there and call sysfs_notify
later in process context.

Signed-off-by: default avatarNeil Brown <neilb@suse.de>
parent a99ac971

Documentation/md.txt

+10 −0
Original line number Diff line number Diff line
@@ -297,6 +297,10 @@ Each directory contains: 
	      writemostly - device will only be subject to read

		         requests if there are no other options.

			 This applies only to raid1 arrays.

	      blocked  - device has failed, metadata is "external",

	                 and the failure hasn't been acknowledged yet.

			 Writes that would write to this device if

			 it were not faulty are blocked.

	      spare    - device is working, but not a full member.

			 This includes spares that are in the process

			 of being recovered to
@@ -306,6 +310,12 @@ Each directory contains: 
	Writing "remove" removes the device from the array.

	Writing "writemostly" sets the writemostly flag.

	Writing "-writemostly" clears the writemostly flag.

	Writing "blocked" sets the "blocked" flag.

	Writing "-blocked" clear the "blocked" flag and allows writes

		to complete.



	This file responds to select/poll. Any change to 'faulty'

	or 'blocked' causes an event.



      errors

	An approximate count of read errors that have been detected on

drivers/md/md.c

+13 −1
Original line number Diff line number Diff line
@@ -1886,6 +1886,8 @@ state_store(mdk_rdev_t *rdev, const char *buf, size_t len) 


		err = 0;

	}

	if (!err)

		sysfs_notify(&rdev->kobj, NULL, "state");

	return err ? err : len;

}

static struct rdev_sysfs_entry rdev_state =
@@ -1979,7 +1981,8 @@ slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) 
		if (err) {

			rdev->raid_disk = -1;

			return err;

		}

		} else

			sysfs_notify(&rdev->kobj, NULL, "state");

		sprintf(nm, "rd%d", rdev->raid_disk);

		if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))

			printk(KERN_WARNING
@@ -1996,6 +1999,7 @@ slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) 
		clear_bit(Faulty, &rdev->flags);

		clear_bit(WriteMostly, &rdev->flags);

		set_bit(In_sync, &rdev->flags);

		sysfs_notify(&rdev->kobj, NULL, "state");

	}

	return len;

}
@@ -3525,6 +3529,7 @@ static int do_md_run(mddev_t * mddev) 
				return -EINVAL;

			}

		}

		sysfs_notify(&rdev->kobj, NULL, "state");

	}



	md_probe(mddev->unit, NULL, NULL);
@@ -4256,6 +4261,8 @@ static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) 
		}

		if (err)

			export_rdev(rdev);

		else

			sysfs_notify(&rdev->kobj, NULL, "state");



		md_update_sb(mddev, 1);

		if (mddev->degraded)
@@ -5115,6 +5122,7 @@ void md_error(mddev_t *mddev, mdk_rdev_t *rdev) 
	mddev->pers->error_handler(mddev,rdev);

	if (mddev->degraded)

		set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);

	set_bit(StateChanged, &rdev->flags);

	set_bit(MD_RECOVERY_INTR, &mddev->recovery);

	set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);

	md_wakeup_thread(mddev->thread);
@@ -6037,6 +6045,10 @@ void md_check_recovery(mddev_t *mddev) 
		if (mddev->flags)

			md_update_sb(mddev, 0);



		rdev_for_each(rdev, rtmp, mddev)

			if (test_and_clear_bit(StateChanged, &rdev->flags))

				sysfs_notify(&rdev->kobj, NULL, "state");





		if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&

		    !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {

include/linux/raid/md_k.h

+3 −0
Original line number Diff line number Diff line
@@ -87,6 +87,9 @@ struct mdk_rdev_s 
#define Blocked		8		/* An error occured on an externally

					 * managed array, don't allow writes

					 * until it is cleared */

#define StateChanged	9		/* Faulty or Blocked has changed during

					 * interrupt, so it needs to be

					 * notified by the thread */

	wait_queue_head_t blocked_wait;



	int desc_nr;			/* descriptor index in the superblock */