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diff -up nss/lib/softoken/sdb.c.fs-probe nss/lib/softoken/sdb.c
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--- nss/lib/softoken/sdb.c.fs-probe	2019-05-10 23:14:18.000000000 +0200
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+++ nss/lib/softoken/sdb.c	2019-05-16 13:26:17.898377555 +0200
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@@ -1954,7 +1954,7 @@ sdb_init(char *dbname, char *table, sdbD
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         /* By default, with no variable set, we avoid expensive measuring for
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          * most FS types. We start with inexpensive FS type checking, and
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          * might perform measuring for some types. */
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-        checkFSType = PR_TRUE;
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+        measureSpeed = PR_TRUE;
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     } else if (PORT_Strcasecmp(env, "yes") == 0) {
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         enableCache = PR_TRUE;
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     } else if (PORT_Strcasecmp(env, "no") != 0) { /* not "no" => "auto" */
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@@ -2135,8 +2135,8 @@ s_open(const char *directory, const char
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         /* If the environment variable is undefined or set to yes or no,
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          * sdb_init() will ignore the value of accessOps, and we can skip the
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          * measuring.*/
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-        if (env && PORT_Strcasecmp(env, "no") != 0 &&
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-            PORT_Strcasecmp(env, "yes") != 0) {
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+        if (!env || (PORT_Strcasecmp(env, "no") != 0 &&
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+		     PORT_Strcasecmp(env, "yes") != 0)) {
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             accessOps = sdb_measureAccess(directory);
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         }
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     }