LU-12852 pfl: restrict the stripe count correctly

In function lod_get_stripe_count(), when restricting the stripe
count to the maximum xattr size, the xattr overhead should be
taken into count correctly.

Lustre-change: https://review.whamcloud.com/36947
Lustre-commit: 6dc37759cfb22727ac5d776c38b72e8638563fd8

Signed-off-by: Emoly Liu <emoly@whamcloud.com>
Change-Id: Ief548e47ce4d375f2e189860ccfe05d0f3c7e890
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Signed-off-by: Minh Diep <mdiep@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/37512
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>

diff --git a/lustre/lod/lod_qos.c b/lustre/lod/lod_qos.c
index cf4dc7f..f5754e8 100644 (file)
--- a/lustre/lod/lod_qos.c
+++ b/lustre/lod/lod_qos.c
@@ -1784,6 +1784,8 @@ __u16 lod_get_stripe_count(struct lod_device *lod, struct lod_object *lo,
                max_stripes = lov_mds_md_max_stripe_count(easize, LOV_MAGIC_V3);
        }
 
+       max_stripes = (max_stripes == 0) ? 0 : max_stripes - 1;
+
        return (stripe_count < max_stripes) ? stripe_count : max_stripes;
 }