X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;f=lustre%2Fquota%2Fqmt_internal.h;h=c3f7fd6789768003fc35e5cf48ef56a4ec4deb0c;hb=b38eb0b6c483e40a6112d02cffeed53c3ee5a743;hp=ba7042c11b6d662c7ca361529f60165bdeadb8b6;hpb=736ffdc4d6975aaeac83019dd2a88100f4e3d028;p=fs%2Flustre-release.git

diff --git a/lustre/quota/qmt_internal.h b/lustre/quota/qmt_internal.h
index ba7042c..c3f7fd6 100644
--- a/lustre/quota/qmt_internal.h
+++ b/lustre/quota/qmt_internal.h
@@ -21,7 +21,7 @@
  * GPL HEADER END
  */
 /*
- * Copyright (c) 2012, Intel Corporation.
+ * Copyright (c) 2012, 2016, Intel Corporation.
  * Use is subject to license terms.
  */
 
@@ -65,7 +65,7 @@ struct qmt_device {
 	 * Once we support quota on non-default pools, then more pools will
 	 * be added to this hash table and pool master setup would have to be
 	 * handled via configuration logs */
-	cfs_hash_t		*qmt_pool_hash;
+	struct cfs_hash		*qmt_pool_hash;
 
 	/* List of pools managed by this master target */
 	struct list_head	 qmt_pool_list;
@@ -139,6 +139,22 @@ struct qmt_pool_info {
 	/* Global quota parameters which apply to all quota type */
 	/* the least value of qunit */
 	unsigned long		 qpi_least_qunit;
+
+	/* Least value of qunit when soft limit is exceeded.
+	 *
+	 * When soft limit is exceeded, qunit will be shrinked to least_qunit
+	 * (1M for block limit), that results in significant write performance
+	 * drop since the client will turn to sync write from now on.
+	 *
+	 * To retain the write performance in an acceptable level, we choose
+	 * to sacrifice grace time accuracy a bit and use a larger least_qunit
+	 * when soft limit is exceeded. It's (qpi_least_qunit * 4) by default,
+	 * and user may enlarge it via procfs to get even better performance
+	 * (with the cost of losing more grace time accuracy).
+	 *
+	 * See qmt_calc_softlimit().
+	 */
+	unsigned long		 qpi_soft_least_qunit;
 };
 
 /*