From cea93dc1db568312987814b3cae0a6f837cfaa4e Mon Sep 17 00:00:00 2001
From: seb <sysstat@orange.fr.fake>
Date: Sun, 5 May 2013 17:42:03 +0200
Subject: [PATCH] Filesystems statistics for sar (part 2): Read statistics

This patch reads statistics for mounted filesystems except for
pseudo-filesystems which are ignored.
It also determines the number of filesystems for which stats will be
read.
Oh, and it adds another field to the stats_filesystem structure so that
filesystem name can be saved ;-)

(cherry picked from commit 512bf2e7ebfa5e5fec757d96820b0b3f94341797)
---
 rd_stats.c | 87 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 rd_stats.h | 17 ++++++++----
 sa_wrap.c  |  5 ++--
 3 files changed, 102 insertions(+), 7 deletions(-)

diff --git a/rd_stats.c b/rd_stats.c
index d8c337a..829dae5 100644
--- a/rd_stats.c
+++ b/rd_stats.c
@@ -27,6 +27,7 @@
 #include <ctype.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <sys/vfs.h>
 #include <unistd.h>
 
 #include "common.h"
@@ -1863,6 +1864,51 @@ void read_bus_usb_dev(struct stats_pwr_usb *st_pwr_usb, int nbr)
 	closedir(dir);
 }
 
+/*
+ ***************************************************************************
+ * Read filesystems statistics.
+ *
+ * IN:
+ * @st_filesystem	Structure where stats will be saved.
+ * @nbr			Total number of filesystems.
+ *
+ * OUT:
+ * @st_filesystem	Structure with statistics.
+ ***************************************************************************
+ */
+void read_filesystem(struct stats_filesystem *st_filesystem, int nbr)
+{
+	FILE *fp;
+	char line[256], fs_name[MAX_FS_LEN], mountp[128];
+	int fs = 0;
+	struct stats_filesystem *st_filesystem_i;
+	struct statfs buf;
+
+	if ((fp = fopen(MTAB, "r")) == NULL)
+		return;
+
+	while ((fgets(line, 256, fp) != NULL) && (fs < nbr)) {
+		if (line[0] == '/') {
+			
+			/* Read current filesystem name and mount point */
+			sscanf(line, "%71s %127s", fs_name, mountp);
+			
+			if ((statfs(mountp, &buf) < 0) || (!buf.f_blocks))
+				continue;
+			
+			st_filesystem_i = st_filesystem + fs++;
+			st_filesystem_i->f_blocks = buf.f_blocks * buf.f_bsize;
+			st_filesystem_i->f_bfree  = buf.f_bfree * buf.f_bsize;
+			st_filesystem_i->f_bavail = buf.f_bavail * buf.f_bsize;
+			st_filesystem_i->f_files  = buf.f_files;
+			st_filesystem_i->f_ffree  = buf.f_ffree;
+			strcpy(st_filesystem_i->fs_name, fs_name);
+		}
+	}
+
+	fclose(fp);
+}
+
 /*
  ***************************************************************************
  * Read machine uptime, independently of the number of processors.
@@ -2282,3 +2328,44 @@ int get_usb_nr(void)
 
 	return usb;
 }
+
+/*
+ ***************************************************************************
+ * Find number of filesystems in /etc/mtab. Pseudo-filesystems are ignored.
+ *
+ * RETURNS:
+ * Number of filesystems.
+ ***************************************************************************
+ */
+int get_filesystem_nr(void)
+{
+	FILE *fp;
+	char line[256], fs_name[MAX_FS_LEN], mountp[128];
+	int fs = 0;
+	struct statfs buf;
+
+	if ((fp = fopen(MTAB, "r")) == NULL)
+		/* File non-existent */
+		return 0;
+
+	/* Get current filesystem */
+	while (fgets(line, 256, fp) != NULL) {
+		if (line[0] == '/') {
+			
+			/* Read filesystem name and mount point */
+			sscanf(line, "%71s %127s", fs_name, mountp);
+			
+			/* Check that total size is not null */
+			if (statfs(mountp, &buf) < 0)
+				continue;
+			
+			if (buf.f_blocks) {
+				fs++;
+			}
+		}
+	}
+
+	fclose(fp);
+
+	return fs;
+}
diff --git a/rd_stats.h b/rd_stats.h
index f941426..3f1edde 100644
--- a/rd_stats.h
+++ b/rd_stats.h
@@ -27,6 +27,8 @@
 #define MAX_MANUF_LEN	24
 /* Maximum length of USB product string */
 #define MAX_PROD_LEN	48
+/* Maximum length of filesystem name */
+#define MAX_FS_LEN	72
 
 #define CNT_DEV		0
 #define CNT_PART	1
@@ -523,11 +525,12 @@ struct stats_pwr_usb {
 
 /* Structure for filesystems statistics */
 struct stats_filesystem {
-	unsigned long long f_blocks	__attribute__ ((aligned (16)));
-	unsigned long long f_bfree	__attribute__ ((aligned (16)));
-	unsigned long long f_bavail	__attribute__ ((aligned (16)));
-	unsigned long long f_files	__attribute__ ((aligned (16)));
-	unsigned long long f_ffree	__attribute__ ((aligned (16)));
+	unsigned long long f_blocks		__attribute__ ((aligned (16)));
+	unsigned long long f_bfree		__attribute__ ((aligned (16)));
+	unsigned long long f_bavail		__attribute__ ((aligned (16)));
+	unsigned long long f_files		__attribute__ ((aligned (16)));
+	unsigned long long f_ffree		__attribute__ ((aligned (16)));
+	char 		   fs_name[MAX_FS_LEN]	__attribute__ ((aligned (16)));
 };
 
 #define STATS_FILESYSTEM_SIZE	(sizeof(struct stats_filesystem))
@@ -607,6 +610,8 @@ extern void
 	read_time_in_state(struct stats_pwr_wghfreq *, int, int);
 extern void
 	read_bus_usb_dev(struct stats_pwr_usb *, int);
+extern void
+	read_filesystem(struct stats_filesystem *, int);
 
 /*
  ***************************************************************************
@@ -632,5 +637,7 @@ extern int
 	get_freq_nr(void);
 extern int
 	get_usb_nr(void);
+extern int
+	get_filesystem_nr(void);
 
 #endif /* _RD_STATS_H */
diff --git a/sa_wrap.c b/sa_wrap.c
index 298f889..6a829d7 100644
--- a/sa_wrap.c
+++ b/sa_wrap.c
@@ -864,7 +864,7 @@ __read_funct_t wrap_read_filesystem(struct activity *a)
 		= (struct stats_filesystem *) a->_buf0;
 
 	/* Read filesystems from /etc/mtab */
-	/* FIXME */
+	read_filesystem(st_filesystem, a->nr);
 
 	return;
 }
@@ -1088,7 +1088,8 @@ __nr_t wrap_get_filesystem_nr(struct activity *a)
 {
 	__nr_t n = 0;
 
-	/* FIXME */
+	if ((n = get_filesystem_nr()) > 0)
+		return n + NR_FILESYSTEM_PREALLOC;
 
 	return 0;
 }
-- 
2.14.3