md/multipath: discard ->working_disks in favour of ->degraded

conf->working_disks duplicates information already available
in mddev->degraded.
So remove working_disks.

Signed-off-by: NeilBrown <neilb@suse.de>

2 files changed, 11 insertions, 12 deletions

diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
index c3589099098..02547124aa8 100644
--- a/drivers/md/multipath.c
+++ b/drivers/md/multipath.c
@@ -146,7 +146,7 @@ static void multipath_status (struct seq_file *seq, mddev_t *mddev)
         int i;
         
         seq_printf (seq, " [%d/%d] [", conf->raid_disks,
-                                                 conf->working_disks);
+                    conf->raid_disks - mddev->degraded);
         for (i = 0; i < conf->raid_disks; i++)
                 seq_printf (seq, "%s",
                                conf->multipaths[i].rdev && 
@@ -187,7 +187,7 @@ static void multipath_error (mddev_t *mddev, mdk_rdev_t *rdev)
 {
         multipath_conf_t *conf = mddev->private;
 
-        if (conf->working_disks <= 1) {
+        if (conf->raid_disks - mddev->degraded <= 1) {
                 /*
                  * Uh oh, we can do nothing if this is our last path, but
                  * first check if this is a queued request for a device
@@ -205,14 +205,13 @@ static void multipath_error (mddev_t *mddev, mdk_rdev_t *rdev)
                         clear_bit(In_sync, &rdev->flags);
                         set_bit(Faulty, &rdev->flags);
                         set_bit(MD_CHANGE_DEVS, &mddev->flags);
-                        conf->working_disks--;
                         mddev->degraded++;
                         printk(KERN_ALERT "multipath: IO failure on %s,"
                                 " disabling IO path.\n"
                                 "multipath: Operation continuing"
                                 " on %d IO paths.\n",
                                 bdevname (rdev->bdev,b),
-                                conf->working_disks);
+                                conf->raid_disks - mddev->degraded);
                 }
         }
 }
@@ -227,7 +226,7 @@ static void print_multipath_conf (multipath_conf_t *conf)
                 printk("(conf==NULL)\n");
                 return;
         }
-        printk(" --- wd:%d rd:%d\n", conf->working_disks,
+        printk(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded,
                          conf->raid_disks);
 
         for (i = 0; i < conf->raid_disks; i++) {
@@ -274,7 +273,6 @@ static int multipath_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
                                                            PAGE_CACHE_SIZE - 1);
                         }
 
-                        conf->working_disks++;
                         mddev->degraded--;
                         rdev->raid_disk = path;
                         set_bit(In_sync, &rdev->flags);
@@ -391,6 +389,7 @@ static int multipath_run (mddev_t *mddev)
         int disk_idx;
         struct multipath_info *disk;
         mdk_rdev_t *rdev;
+        int working_disks;
 
         if (md_check_no_bitmap(mddev))
                 return -EINVAL;
@@ -424,7 +423,7 @@ static int multipath_run (mddev_t *mddev)
                 goto out_free_conf;
         }
 
-        conf->working_disks = 0;
+        working_disks = 0;
         list_for_each_entry(rdev, &mddev->disks, same_set) {
                 disk_idx = rdev->raid_disk;
                 if (disk_idx < 0 ||
@@ -446,7 +445,7 @@ static int multipath_run (mddev_t *mddev)
                 }
 
                 if (!test_bit(Faulty, &rdev->flags))
-                        conf->working_disks++;
+                        working_disks++;
         }
 
         conf->raid_disks = mddev->raid_disks;
@@ -454,12 +453,12 @@ static int multipath_run (mddev_t *mddev)
         spin_lock_init(&conf->device_lock);
         INIT_LIST_HEAD(&conf->retry_list);
 
-        if (!conf->working_disks) {
+        if (!working_disks) {
                 printk(KERN_ERR "multipath: no operational IO paths for %s\n",
                         mdname(mddev));
                 goto out_free_conf;
         }
-        mddev->degraded = conf->raid_disks - conf->working_disks;
+        mddev->degraded = conf->raid_disks - working_disks;
 
         conf->pool = mempool_create_kmalloc_pool(NR_RESERVED_BUFS,
                                                  sizeof(struct multipath_bh));
@@ -481,7 +480,8 @@ static int multipath_run (mddev_t *mddev)
 
         printk(KERN_INFO 
                 "multipath: array %s active with %d out of %d IO paths\n",
-                mdname(mddev), conf->working_disks, mddev->raid_disks);
+                mdname(mddev), conf->raid_disks - mddev->degraded,
+               mddev->raid_disks);
         /*
          * Ok, everything is just fine now
          */
diff --git a/drivers/md/multipath.h b/drivers/md/multipath.h
index d1c2a8d7839..3c5a45eb5f8 100644
--- a/drivers/md/multipath.h
+++ b/drivers/md/multipath.h
@@ -9,7 +9,6 @@ struct multipath_private_data {
         mddev_t                 *mddev;
         struct multipath_info   *multipaths;
         int                     raid_disks;
-        int                     working_disks;
         spinlock_t              device_lock;
         struct list_head        retry_list;