[PATCH] md: Update status_resync to handle LARGE devices

status_resync - used by /proc/mdstat to report the status of a resync, assumes
that device sizes will always fit into an 'unsigned long' This is no longer
the case...

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, 24 insertions, 6 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 686314f070a5..a3ecaf8ed30a 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -4044,7 +4044,10 @@ static void status_unused(struct seq_file *seq)
 
 static void status_resync(struct seq_file *seq, mddev_t * mddev)
 {
-        unsigned long max_blocks, resync, res, dt, db, rt;
+        sector_t max_blocks, resync, res;
+        unsigned long dt, db, rt;
+        int scale;
+        unsigned int per_milli;
 
         resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
 
@@ -4060,9 +4063,22 @@ static void status_resync(struct seq_file *seq, mddev_t * mddev)
                 MD_BUG();
                 return;
         }
-        res = (resync/1024)*1000/(max_blocks/1024 + 1);
+        /* Pick 'scale' such that (resync>>scale)*1000 will fit
+         * in a sector_t, and (max_blocks>>scale) will fit in a
+         * u32, as those are the requirements for sector_div.
+         * Thus 'scale' must be at least 10
+         */
+        scale = 10;
+        if (sizeof(sector_t) > sizeof(unsigned long)) {
+                while ( max_blocks/2 > (1ULL<<(scale+32)))
+                        scale++;
+        }
+        res = (resync>>scale)*1000;
+        sector_div(res, (u32)((max_blocks>>scale)+1));
+
+        per_milli = res;
         {
-                int i, x = res/50, y = 20-x;
+                int i, x = per_milli/50, y = 20-x;
                 seq_printf(seq, "[");
                 for (i = 0; i < x; i++)
                         seq_printf(seq, "=");
@@ -4071,10 +4087,12 @@ static void status_resync(struct seq_file *seq, mddev_t * mddev)
                         seq_printf(seq, ".");
                 seq_printf(seq, "] ");
         }
-        seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)",
+        seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
                       (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
                        "resync" : "recovery"),
-                      res/10, res % 10, resync, max_blocks);
+                      per_milli/10, per_milli % 10,
+                   (unsigned long long) resync,
+                   (unsigned long long) max_blocks);
 
         /*
          * We do not want to overflow, so the order of operands and
@@ -4088,7 +4106,7 @@ static void status_resync(struct seq_file *seq, mddev_t * mddev)
         dt = ((jiffies - mddev->resync_mark) / HZ);
         if (!dt) dt++;
         db = resync - (mddev->resync_mark_cnt/2);
-        rt = (dt * ((max_blocks-resync) / (db/100+1)))/100;
+        rt = (dt * ((unsigned long)(max_blocks-resync) / (db/100+1)))/100;
 
         seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);