[PATCH v2] xfs: correct calculation for agend and blockcount

[Shiyang Ruan <ruansy.fnst@xxxxxxxxxxx>]

The agend should be "start + length - 1", then, blockcount should be
"end + 1 - start".  Correct 2 calculation mistakes.

Fixes: 5cf32f63b0f4 ("xfs: fix the calculation for "end" and "length"")
Signed-off-by: Shiyang Ruan <ruansy.fnst@xxxxxxxxxxx>
---
 fs/xfs/xfs_notify_failure.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/xfs/xfs_notify_failure.c b/fs/xfs/xfs_notify_failure.c
index 4a9bbd3fe120..8b8ef776bdc3 100644
--- a/fs/xfs/xfs_notify_failure.c
+++ b/fs/xfs/xfs_notify_failure.c
@@ -148,10 +148,10 @@ xfs_dax_notify_ddev_failure(
 			ri_high.rm_startblock = XFS_FSB_TO_AGBNO(mp, end_fsbno);
 
 		agf = agf_bp->b_addr;
-		agend = min(be32_to_cpu(agf->agf_length),
+		agend = min(be32_to_cpu(agf->agf_length) - 1,
 				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);
-- 
2.42.0