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-rw-r--r--Documentation/md.txt3
-rw-r--r--drivers/md/md.c26
2 files changed, 28 insertions, 1 deletions
diff --git a/Documentation/md.txt b/Documentation/md.txt
index df0b45515775..4cf5972821a9 100644
--- a/Documentation/md.txt
+++ b/Documentation/md.txt
@@ -302,6 +302,9 @@ Each directory contains:
302 This includes spares that are in the process 302 This includes spares that are in the process
303 of being recoverred to 303 of being recoverred to
304 This list make grow in future. 304 This list make grow in future.
305 This can be written to.
306 Writing "faulty" simulates a failure on the device.
307 Writing "remove" removes the device from the array.
305 308
306 errors 309 errors
307 An approximate count of read errors that have been detected on 310 An approximate count of read errors that have been detected on
diff --git a/drivers/md/md.c b/drivers/md/md.c
index f6562ee4c6fc..4b74c77213c3 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1745,8 +1745,32 @@ state_show(mdk_rdev_t *rdev, char *page)
1745 return len+sprintf(page+len, "\n"); 1745 return len+sprintf(page+len, "\n");
1746} 1746}
1747 1747
1748static ssize_t
1749state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1750{
1751 /* can write
1752 * faulty - simulates and error
1753 * remove - disconnects the device
1754 */
1755 int err = -EINVAL;
1756 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
1757 md_error(rdev->mddev, rdev);
1758 err = 0;
1759 } else if (cmd_match(buf, "remove")) {
1760 if (rdev->raid_disk >= 0)
1761 err = -EBUSY;
1762 else {
1763 mddev_t *mddev = rdev->mddev;
1764 kick_rdev_from_array(rdev);
1765 md_update_sb(mddev);
1766 md_new_event(mddev);
1767 err = 0;
1768 }
1769 }
1770 return err ? err : len;
1771}
1748static struct rdev_sysfs_entry 1772static struct rdev_sysfs_entry
1749rdev_state = __ATTR_RO(state); 1773rdev_state = __ATTR(state, 0644, state_show, state_store);
1750 1774
1751static ssize_t 1775static ssize_t
1752super_show(mdk_rdev_t *rdev, char *page) 1776super_show(mdk_rdev_t *rdev, char *page)