In __btrfs_map_block(), stripe_index is always wrong if mirror_num is
given.
For DUP/RAID1 case, if mirror_num is given, e.g. 1, it should return the
second stripe.
But codes consider the mirror_num is start from 1 and always minus 1,
causing even mirror number is given as 1, __btrfs_map_block() will still
map the first stripe not the second.
Signed-off-by: Qu Wenruo <quwen...@cn.fujitsu.com>
---
volumes.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/volumes.c b/volumes.c
index 16dbf64..c66c02a 100644
--- a/volumes.c
+++ b/volumes.c
@@ -1397,7 +1397,7 @@ again:
if (rw == WRITE)
multi->num_stripes = map->num_stripes;
else if (mirror_num)
- stripe_index = mirror_num - 1;
+ stripe_index = mirror_num;
else
stripe_index = stripe_nr % map->num_stripes;
} else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
@@ -1416,7 +1416,7 @@ again:
if (rw == WRITE)
multi->num_stripes = map->num_stripes;
else if (mirror_num)
- stripe_index = mirror_num - 1;
+ stripe_index = mirror_num;
} else if (map->type & (BTRFS_BLOCK_GROUP_RAID5 |
BTRFS_BLOCK_GROUP_RAID6)) {
--
2.4.0
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