1 files changed, 12 insertions, 0 deletions

diff --git a/fs/xfs/xfs_ialloc.c b/fs/xfs/xfs_ialloc.c
index 5d7f105a1c82..283a76d2c798 100644
--- a/fs/xfs/xfs_ialloc.c
+++ b/fs/xfs/xfs_ialloc.c
@@ -363,6 +363,18 @@ xfs_ialloc_ag_alloc(
                 args.minleft = args.mp->m_in_maxlevels - 1;
                 if ((error = xfs_alloc_vextent(&args)))
                         return error;
+
+                /*
+                 * This request might have dirtied the transaction if the AG can
+                 * satisfy the request, but the exact block was not available.
+                 * If the allocation did fail, subsequent requests will relax
+                 * the exact agbno requirement and increase the alignment
+                 * instead. It is critical that the total size of the request
+                 * (len + alignment + slop) does not increase from this point
+                 * on, so reset minalignslop to ensure it is not included in
+                 * subsequent requests.
+                 */
+                args.minalignslop = 0;
         } else
                 args.fsbno = NULLFSBLOCK;