[PATCH] xfs: correct calculation for blockcount

[Shiyang Ruan <ruansy.fnst@xxxxxxxxxxx>]

The blockcount, which means length, should be "end + 1 - start".  So,
add the missing "+1" here.

Fixes: 5cf32f63b0f4 ("xfs: fix the calculation for "end" and "length"")
Signed-off-by: Shiyang Ruan <ruansy.fnst@xxxxxxxxxxx>
---
 fs/xfs/xfs_notify_failure.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_notify_failure.c b/fs/xfs/xfs_notify_failure.c
index 4a9bbd3fe120..459fc8a39635 100644
--- a/fs/xfs/xfs_notify_failure.c
+++ b/fs/xfs/xfs_notify_failure.c
@@ -151,7 +151,7 @@ xfs_dax_notify_ddev_failure(
 		agend = min(be32_to_cpu(agf->agf_length),
 				ri_high.rm_startblock);
 		notify.startblock = ri_low.rm_startblock;
-		notify.blockcount = agend - ri_low.rm_startblock;
+		notify.blockcount = agend + 1 - ri_low.rm_startblock;
 
 		error = xfs_rmap_query_range(cur, &ri_low, &ri_high,
 				xfs_dax_failure_fn, &notify);
-- 
2.41.0