[PATCH] md: improve 'scan_mode' and rename it to 'sync_action'

The current sync_action for an array can be one of

   idle  - nothing happening
   resync - reduncancy being recalcualted
   recover - missing device being recoverred to spare
   check   - user initiated check of redundancy
   repair  - like resync but user-initiated and ignores
             bitmap optimisation.

Each of these strings can also be written to the 'sync_action' file to cause
that action to happen (if appropriate).

While 'sync' is not technically correct, as a recovery is *not* a 'sync', I
think it is the most servicable word here.  Also 'action' is a strong word
than 'mode'.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 28 insertions, 19 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 097ae1b5484..023aecd0295 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1746,9 +1746,9 @@ raid_disks_show(mddev_t *mddev, char *page)
 static struct md_sysfs_entry md_raid_disks = __ATTR_RO(raid_disks);
 
 static ssize_t
-md_show_scan(mddev_t *mddev, char *page)
+action_show(mddev_t *mddev, char *page)
 {
-        char *type = "none";
+        char *type = "idle";
         if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
             test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
                 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
@@ -1765,27 +1765,36 @@ md_show_scan(mddev_t *mddev, char *page)
 }
 
 static ssize_t
-md_store_scan(mddev_t *mddev, const char *page, size_t len)
+action_store(mddev_t *mddev, const char *page, size_t len)
 {
-        int canscan=0;
+        if (!mddev->pers || !mddev->pers->sync_request)
+                return -EINVAL;
+
+        if (strcmp(page, "idle")==0 || strcmp(page, "idle\n")==0) {
+                if (mddev->sync_thread) {
+                        set_bit(MD_RECOVERY_INTR, &mddev->recovery);
+                        md_unregister_thread(mddev->sync_thread);
+                        mddev->sync_thread = NULL;
+                        mddev->recovery = 0;
+                }
+                return len;
+        }
 
         if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
             test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
                 return -EBUSY;
-
-        if (mddev->pers && mddev->pers->sync_request)
-                canscan=1;
-
-        if (!canscan)
-                return -EINVAL;
-
-        if (strcmp(page, "check")==0 || strcmp(page, "check\n")==0)
-                set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
-        else if (strcmp(page, "repair")!=0 && strcmp(page, "repair\n")!=0)
-                return -EINVAL;
-        set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
-        set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
-        set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+        if (strcmp(page, "resync")==0 || strcmp(page, "resync\n")==0 ||
+            strcmp(page, "recover")==0 || strcmp(page, "recover\n")==0)
+                set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+        else {
+                if (strcmp(page, "check")==0 || strcmp(page, "check\n")==0)
+                        set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
+                else if (strcmp(page, "repair")!=0 && strcmp(page, "repair\n")!=0)
+                        return -EINVAL;
+                set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
+                set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
+                set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+        }
         md_wakeup_thread(mddev->thread);
         return len;
 }
@@ -1798,7 +1807,7 @@ mismatch_cnt_show(mddev_t *mddev, char *page)
 }
 
 static struct md_sysfs_entry
-md_scan_mode = __ATTR(scan_mode, S_IRUGO|S_IWUSR, md_show_scan, md_store_scan);
+md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
 
 
 static struct md_sysfs_entry