LU-8895 target: limit grant allocation

[fs/lustre-release.git] / lustre / target / tgt_grant.c

diff --git a/lustre/target/tgt_grant.c b/lustre/target/tgt_grant.c
index 4fa0623..355a092 100644 (file)
--- a/lustre/target/tgt_grant.c
+++ b/lustre/target/tgt_grant.c
@@ -931,6 +931,14 @@ static long tgt_grant_alloc(struct obd_export *exp, u64 curgrant,
        if ((grant > chunk) && conservative)
                grant = chunk;
 
        if ((grant > chunk) && conservative)
                grant = chunk;
 

+       /*
+        * Limit grant so that export' grant does not exceed what the
+        * client would like to have by more than grants for 2 full
+        * RPCs
+        */
+       if (ted->ted_grant + grant > want + chunk)
+               grant = want + chunk - ted->ted_grant;
+

        tgd->tgd_tot_granted += grant;
        ted->ted_grant += grant;
 
        tgd->tgd_tot_granted += grant;
        ted->ted_grant += grant;