[PATCH] md: remove the working_disks and failed_disks from raid5 state data.

They are not needed.  conf->failed_disks is the same as mddev->degraded and
conf->working_disks is conf->raid_disks - mddev->degraded.

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, 8 insertions, 12 deletions

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index d5a06b258427..1c8ab340a11d 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -698,9 +698,7 @@ static void error(mddev_t *mddev, mdk_rdev_t *rdev)
         if (!test_bit(Faulty, &rdev->flags)) {
                 set_bit(MD_CHANGE_DEVS, &mddev->flags);
                 if (test_bit(In_sync, &rdev->flags)) {
-                        conf->working_disks--;
                         mddev->degraded++;
-                        conf->failed_disks++;
                         clear_bit(In_sync, &rdev->flags);
                         /*
                          * if recovery was running, make sure it aborts.
@@ -711,7 +709,7 @@ static void error(mddev_t *mddev, mdk_rdev_t *rdev)
                 printk (KERN_ALERT
                         "raid5: Disk failure on %s, disabling device."
                         " Operation continuing on %d devices\n",
-                        bdevname(rdev->bdev,b), conf->working_disks);
+                        bdevname(rdev->bdev,b), conf->raid_disks - mddev->degraded);
         }
 }
 
@@ -3074,6 +3072,7 @@ static int run(mddev_t *mddev)
         mdk_rdev_t *rdev;
         struct disk_info *disk;
         struct list_head *tmp;
+        int working_disks = 0;
 
         if (mddev->level != 5 && mddev->level != 4 && mddev->level != 6) {
                 printk(KERN_ERR "raid5: %s: raid level not set to 4/5/6 (%d)\n",
@@ -3176,14 +3175,14 @@ static int run(mddev_t *mddev)
                         printk(KERN_INFO "raid5: device %s operational as raid"
                                 " disk %d\n", bdevname(rdev->bdev,b),
                                 raid_disk);
-                        conf->working_disks++;
+                        working_disks++;
                 }
         }
 
         /*
          * 0 for a fully functional array, 1 or 2 for a degraded array.
          */
-        mddev->degraded = conf->failed_disks = conf->raid_disks - conf->working_disks;
+        mddev->degraded = conf->raid_disks - working_disks;
         conf->mddev = mddev;
         conf->chunk_size = mddev->chunk_size;
         conf->level = mddev->level;
@@ -3218,7 +3217,7 @@ static int run(mddev_t *mddev)
         if (mddev->degraded > conf->max_degraded) {
                 printk(KERN_ERR "raid5: not enough operational devices for %s"
                         " (%d/%d failed)\n",
-                        mdname(mddev), conf->failed_disks, conf->raid_disks);
+                        mdname(mddev), mddev->degraded, conf->raid_disks);
                 goto abort;
         }
 
@@ -3375,7 +3374,7 @@ static void status (struct seq_file *seq, mddev_t *mddev)
         int i;
 
         seq_printf (seq, " level %d, %dk chunk, algorithm %d", mddev->level, mddev->chunk_size >> 10, mddev->layout);
-        seq_printf (seq, " [%d/%d] [", conf->raid_disks, conf->working_disks);
+        seq_printf (seq, " [%d/%d] [", conf->raid_disks, conf->raid_disks - mddev->degraded);
         for (i = 0; i < conf->raid_disks; i++)
                 seq_printf (seq, "%s",
                                conf->disks[i].rdev &&
@@ -3397,8 +3396,8 @@ static void print_raid5_conf (raid5_conf_t *conf)
                 printk("(conf==NULL)\n");
                 return;
         }
-        printk(" --- rd:%d wd:%d fd:%d\n", conf->raid_disks,
-                 conf->working_disks, conf->failed_disks);
+        printk(" --- rd:%d wd:%d\n", conf->raid_disks,
+                 conf->raid_disks - conf->mddev->degraded);
 
         for (i = 0; i < conf->raid_disks; i++) {
                 char b[BDEVNAME_SIZE];
@@ -3422,8 +3421,6 @@ static int raid5_spare_active(mddev_t *mddev)
                     && !test_bit(Faulty, &tmp->rdev->flags)
                     && !test_bit(In_sync, &tmp->rdev->flags)) {
                         mddev->degraded--;
-                        conf->failed_disks--;
-                        conf->working_disks++;
                         set_bit(In_sync, &tmp->rdev->flags);
                 }
         }
@@ -3593,7 +3590,6 @@ static int raid5_start_reshape(mddev_t *mddev)
                         if (raid5_add_disk(mddev, rdev)) {
                                 char nm[20];
                                 set_bit(In_sync, &rdev->flags);
-                                conf->working_disks++;
                                 added_devices++;
                                 rdev->recovery_offset = 0;
                                 sprintf(nm, "rd%d", rdev->raid_disk);