[PATCH] md: fix innocuous bug in raid6 stripe_to_pdidx

stripe_to_pdidx finds the index of the parity disk for a given stripe.  It
assumes raid5 in that it uses "disks-1" to determine the number of data disks.

This is incorrect for raid6 but fortunately the two usages cancel each other
out.  The only way that 'data_disks' affects the calculation of pd_idx in
raid5_compute_sector is when it is divided into the sector number.  But as
that sector number is calculated by multiplying in the wrong value of
'data_disks' the division produces the right value.

So it is innocuous but needs to be fixed.

Also change the calculation of raid_disks in compute_blocknr to make it
more obviously correct (it seems at first to always use disks-1 too).

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, 6 insertions, 4 deletions

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 2e676e33744c..d855f9f59b02 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -823,7 +823,8 @@ static sector_t raid5_compute_sector(sector_t r_sector, unsigned int raid_disks,
 static sector_t compute_blocknr(struct stripe_head *sh, int i)
 {
         raid5_conf_t *conf = sh->raid_conf;
-        int raid_disks = sh->disks, data_disks = raid_disks - 1;
+        int raid_disks = sh->disks;
+        int data_disks = raid_disks - conf->max_degraded;
         sector_t new_sector = sh->sector, check;
         int sectors_per_chunk = conf->chunk_size >> 9;
         sector_t stripe;
@@ -859,7 +860,6 @@ static sector_t compute_blocknr(struct stripe_head *sh, int i)
                 }
                 break;
         case 6:
-                data_disks = raid_disks - 2;
                 if (i == raid6_next_disk(sh->pd_idx, raid_disks))
                         return 0; /* It is the Q disk */
                 switch (conf->algorithm) {
@@ -1355,8 +1355,10 @@ static int stripe_to_pdidx(sector_t stripe, raid5_conf_t *conf, int disks)
         int pd_idx, dd_idx;
         int chunk_offset = sector_div(stripe, sectors_per_chunk);
 
-        raid5_compute_sector(stripe*(disks-1)*sectors_per_chunk
-                             + chunk_offset, disks, disks-1, &dd_idx, &pd_idx, conf);
+        raid5_compute_sector(stripe * (disks - conf->max_degraded)
+                             *sectors_per_chunk + chunk_offset,
+                             disks, disks - conf->max_degraded,
+                             &dd_idx, &pd_idx, conf);
         return pd_idx;
 }