[patch] zfs-fuse-0.4.0_beta1-no_prefetch.patch

zfs-fuse-0.4.0_beta1-no_prefetch.patch (text/plain), 1.40 KB, created by Ingo Bormuth on 2007-09-06 06:14:49 UTC

--- a/src/lib/libzpool/dbuf.c	2007-09-06 07:56:58.000000000 +0200
+++ b/src/lib/libzpool/dbuf.c	2007-09-06 07:57:42.000000000 +0200
@@ -540,7 +540,6 @@
 {
 	int err = 0;
 	int havepzio = (zio != NULL);
-	int prefetch;
 
 	/*
 	 * We don't have to hold the mutex to check db_state because it
@@ -551,15 +550,9 @@
 	if ((flags & DB_RF_HAVESTRUCT) == 0)
 		rw_enter(&db->db_dnode->dn_struct_rwlock, RW_READER);
 
-	prefetch = db->db_level == 0 && db->db_blkid != DB_BONUS_BLKID &&
-	    (flags & DB_RF_NOPREFETCH) == 0 && db->db_dnode != NULL;
-
 	mutex_enter(&db->db_mtx);
 	if (db->db_state == DB_CACHED) {
 		mutex_exit(&db->db_mtx);
-		if (prefetch)
-			dmu_zfetch(&db->db_dnode->dn_zfetch, db->db.db_offset,
-			    db->db.db_size, TRUE);
 		if ((flags & DB_RF_HAVESTRUCT) == 0)
 			rw_exit(&db->db_dnode->dn_struct_rwlock);
 	} else if (db->db_state == DB_UNCACHED) {
@@ -571,9 +564,6 @@
 
 		/* dbuf_read_impl has dropped db_mtx for us */
 
-		if (prefetch)
-			dmu_zfetch(&db->db_dnode->dn_zfetch, db->db.db_offset,
-			    db->db.db_size, flags & DB_RF_CACHED);
 
 		if ((flags & DB_RF_HAVESTRUCT) == 0)
 			rw_exit(&db->db_dnode->dn_struct_rwlock);
@@ -582,9 +572,6 @@
 			err = zio_wait(zio);
 	} else {
 		mutex_exit(&db->db_mtx);
-		if (prefetch)
-			dmu_zfetch(&db->db_dnode->dn_zfetch, db->db.db_offset,
-			    db->db.db_size, TRUE);
 		if ((flags & DB_RF_HAVESTRUCT) == 0)
 			rw_exit(&db->db_dnode->dn_struct_rwlock);