1 files changed, 93 insertions, 0 deletions
diff --git a/src/pmdas/gfs2/glocks.c b/src/pmdas/gfs2/glocks.c
new file mode 100644
index 0000000..e8dc81e
--- /dev/null
+++ b/src/pmdas/gfs2/glocks.c
@@ -0,0 +1,93 @@
+/*
+ * GFS2 glocks sysfs file statistics.
+ *
+ * Copyright (c) 2013 Red Hat.
+ * 
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "pmapi.h"
+#include "impl.h"
+#include "pmda.h"
+
+#include "glocks.h"
+
+#include <ctype.h>
+
+int
+gfs2_glocks_fetch(int item, struct glocks *glocks, pmAtomValue *atom)
+{
+    /* Check for valid metric count */
+    if (item < 0 || item >= NUM_GLOCKS_STATS)
+	return PM_ERR_PMID;
+
+    /* Check for no values recorded */
+    if(glocks->values[item] == UINT64_MAX)
+        return 0;
+
+    atom->ull = glocks->values[item];
+    return 1;
+}
+
+int
+gfs2_refresh_glocks(const char *sysfs, const char *name, struct glocks *glocks)
+{
+    char buffer[4096];
+    FILE *fp;
+
+    /* Reset all counter for this fs */
+    memset(glocks, 0, sizeof(*glocks));
+
+    snprintf(buffer, sizeof(buffer), "%s/%s/glocks", sysfs, name);
+    buffer[sizeof(buffer)-1] = '\0';
+
+    if ((fp = fopen(buffer, "r")) == NULL) {
+        /*
+         * We set the values to UINT64_MAX to signify we have no
+         * current values (no metric support or debugfs not mounted)
+         *
+         */
+        memset(glocks, -1, sizeof(*glocks));
+	return -oserror();
+    }
+
+    /*
+     * Read through glocks file accumulating statistics as we go;
+     * as an early starting point, we're simply binning aggregate
+     * glock state counts.
+     *
+     */
+    while (fgets(buffer, sizeof(buffer), fp) != NULL) {
+	char *p = buffer;
+
+	/* interested in glock lines only for now */
+	if (strncmp(p, "G:", 2) != 0)
+	    continue;
+	for (p += 2; isspace((int)*p); p++) {;}
+
+	/* pick out the various state fields next */
+	if (strncmp(p, "s:SH", 4) == 0)
+	    glocks->values[GLOCKS_SHARED]++;
+	else if (strncmp(p, "s:UN ", 4) == 0)
+	    glocks->values[GLOCKS_UNLOCKED]++;
+	else if (strncmp(p, "s:DF ", 4) == 0)
+	    glocks->values[GLOCKS_DEFERRED]++;
+	else if (strncmp(p, "s:EX", 4) == 0)
+	    glocks->values[GLOCKS_EXCLUSIVE]++;
+	glocks->values[GLOCKS_TOTAL]++;
+	for (p += 4; isspace((int)*p); p++) {;}
+
+	/* [ extract any other field stats here ] */
+    }
+
+    fclose(fp);
+    return 0;
+}