LU-14337 lov: return stripe_count=1 instead of 0 for DoM files

[fs/lustre-release.git] / lustre / lov / lov_pack.c

diff --git a/lustre/lov/lov_pack.c b/lustre/lov/lov_pack.c
index 77127d5..528f067 100644 (file)
--- a/lustre/lov/lov_pack.c
+++ b/lustre/lov/lov_pack.c
@@ -469,6 +469,14 @@ int lov_getstripe(const struct lu_env *env, struct lov_object *obj,
                lmm = lmmk;
                lmm_size = lmmk_size;
        }
                lmm = lmmk;
                lmm_size = lmmk_size;
        }

+
+       /**
+        * Return stripe_count=1 instead of 0 for DoM files to avoid
+        * divide-by-zero for older userspace that calls this ioctl,
+        * e.g. lustre ADIO driver.
+        */
+       if ((lum.lmm_stripe_count == 0) && (lum.lmm_pattern & LOV_PATTERN_MDT))
+               lum.lmm_stripe_count = 1;

        /**
         * User specified limited buffer size, usually the buffer is
         * from ll_lov_setstripe(), and the buffer can only hold basic
        /**
         * User specified limited buffer size, usually the buffer is
         * from ll_lov_setstripe(), and the buffer can only hold basic