LU-14542 obd: tunable for sanity grant check

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

diff --git a/lustre/target/tgt_grant.c b/lustre/target/tgt_grant.c
index 37d1ba8..ac1757e 100644 (file)
--- a/lustre/target/tgt_grant.c
+++ b/lustre/target/tgt_grant.c
@@ -176,7 +176,7 @@ static int tgt_check_export_grants(struct obd_export *exp, u64 *dirty,
  * argument. LBUG is only called in case of serious counter corruption (i.e.
  * value larger than the device size).
  * Those sanity checks can be pretty expensive and are disabled if the OBD
- * device has more than 100 connected exports.
+ * device has more than 100 connected exports by default.
  *
  * \param[in] obd      OBD device for which grant accounting should be
  *                     verified
@@ -200,9 +200,14 @@ void tgt_grant_sanity_check(struct obd_device *obd, const char *func)
        if (list_empty(&obd->obd_exports))
                return;
 
-       /* We don't want to do this for large machines that do lots of
-        * mounts or unmounts.  It burns... */
-       if (obd->obd_num_exports > 100)
+       /*
+        * We don't want to do this for large machines that do lots of
+        * mounts or unmounts.  It burns...
+        * Use set_param to change obd_grant_check_threshold, which
+        * is 100 by default, 0 to always check grants
+        */
+       if (obd->obd_num_exports > obd->obd_grant_check_threshold &&
+           obd->obd_grant_check_threshold)
                return;
 
        maxsize = tgd->tgd_osfs.os_blocks << tgd->tgd_blockbits;