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Commit 45dc2de1 authored by NeilBrown's avatar NeilBrown Committed by Linus Torvalds
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[PATCH] md: Allow rdev state to be set via sysfs 



The md/dev-XXX/state file can now be written:

 "faulty" simulates an error on the device
 "remove" removes the device from the array (if it is not busy)

Signed-off-by: default avatarNeil Brown <neilb@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 9e653b63

Documentation/md.txt

+3 −0
Original line number Diff line number Diff line
@@ -302,6 +302,9 @@ Each directory contains: 
			 This includes spares that are in the process

			 of being recoverred to

	This list make grow in future.

	This can be written to.

	Writing "faulty"  simulates a failure on the device.

	Writing "remove" removes the device from the array.



      errors

	An approximate count of read errors that have been detected on

drivers/md/md.c

+25 −1
Original line number Diff line number Diff line
@@ -1745,8 +1745,32 @@ state_show(mdk_rdev_t *rdev, char *page) 
	return len+sprintf(page+len, "\n");

}



static ssize_t

state_store(mdk_rdev_t *rdev, const char *buf, size_t len)

{

	/* can write

	 *  faulty  - simulates and error

	 *  remove  - disconnects the device

	 */

	int err = -EINVAL;

	if (cmd_match(buf, "faulty") && rdev->mddev->pers) {

		md_error(rdev->mddev, rdev);

		err = 0;

	} else if (cmd_match(buf, "remove")) {

		if (rdev->raid_disk >= 0)

			err = -EBUSY;

		else {

			mddev_t *mddev = rdev->mddev;

			kick_rdev_from_array(rdev);

			md_update_sb(mddev);

			md_new_event(mddev);

			err = 0;

		}

	}

	return err ? err : len;

}

static struct rdev_sysfs_entry

rdev_state = __ATTR_RO(state);

rdev_state = __ATTR(state, 0644, state_show, state_store);



static ssize_t

super_show(mdk_rdev_t *rdev, char *page)