Reviewed code

f3read.c

@@ -4,7 +4,6 @@
 #include <sys/types.h>
 #include <dirent.h>
 #include <stdio.h>
-#include <ctype.h>
 #include <string.h>
 #include <stdlib.h>
 #include <errno.h>
@@ -28,6 +27,17 @@ static uint64_t offset_from_filename(const char *filename)
 	return number * GIGABYTES;
 }
 
+static inline void update_dt(struct timeval *dt, const struct timeval *t1,
+	const struct timeval *t2)
+{
+	dt->tv_sec  += t2->tv_sec  - t1->tv_sec;
+	dt->tv_usec += t2->tv_usec - t1->tv_usec;
+	if (dt->tv_usec >= 1000000) {
+		dt->tv_sec++;
+		dt->tv_usec -= 1000000;
+	}
+}
+
 #define TOLERANCE	2
 
 #define PRINT_STATUS(s)	printf("%s%7" PRIu64 "/%9" PRIu64 "/%7" PRIu64 "/%7" \
@@ -57,8 +67,7 @@ static void validate_file(const char *path, const char *filename,
 	/* Progress time. */
 	struct timeval pt1 = { .tv_sec = -1000, .tv_usec = 0 };
 
-	*ptr_ok = *ptr_corrupted = *ptr_changed = *ptr_overwritten =
+	*ptr_ok = *ptr_corrupted = *ptr_changed = *ptr_overwritten = 0;
-		*ptr_size = 0;
 
 	printf("Validating file %s ... %s", filename, progress ? BLANK : "");
 	fflush(stdout);
@@ -130,7 +139,8 @@ static void validate_file(const char *path, const char *filename,
 
 	*read_all = feof(f);
 	assert(*read_all || errno == EIO);
-	*ptr_size += ftell(f);
+	*ptr_size = ftell(f);
+	assert(*ptr_size >= 0);
 	fclose(f);
 
 	tail_msg = read_all ? "" : " - NOT fully read";
@@ -145,6 +155,13 @@ static void report(const char *prefix, uint64_t i)
 	printf("%s %.2f %s (%" PRIu64 " sectors)\n", prefix, f, unit, i);
 }
 
+static inline double dt_to_s(struct timeval *dt)
+{
+	double ret = (double)dt->tv_sec + ((double)dt->tv_usec / 1000000.);
+	assert(ret >= 0);
+	return ret > 0 ? ret : 1;
+}
+
 static int iterate_path(const char *path, int progress)
 {
 	DIR *ptr_dir;

f3write.c

@@ -22,7 +22,7 @@ static uint64_t fill_buffer(void *buf, size_t size, uint64_t offset)
 	uint8_t *p, *ptr_next_sector, *ptr_end;
 	struct drand48_data state;
 
-	/* Assumed that size is not zero and a sector-size multiple. */
+	assert(size > 0);
 	assert(size % SECTOR_SIZE == 0);
 
 	p = buf;
@@ -48,7 +48,7 @@ struct flow {
 	uint64_t	total_written;
 	/* If true, show progress. */
 	int		progress;
-	/* Writing rate. */
+	/* Writing rate in bytes. */
 	int		block_size;
 	/* Blocks to write before measurement. */
 	int		blocks_per_delay;
@@ -87,6 +87,7 @@ static inline void init_flow(struct flow *fw, uint64_t total_size, int progress)
 	fw->measured_blocks	= 0;
 	fw->state		= FW_START;
 	fw->erase		= 0;
+	assert(fw->block_size > 0);
 	assert(fw->block_size % SECTOR_SIZE == 0);
 }
 
@@ -113,6 +114,7 @@ static void erase(int count)
 	repeat_ch('\b',	count);
 }
 
+/* Average writing speed in byte/s. */
 static inline double get_avg_speed(struct flow *fw)
 {
 	return	(double)(fw->measured_blocks * fw->block_size * 1000) /
@@ -178,7 +180,15 @@ static void measure(int fd, struct flow *fw)
 			fw->bpd1 = fw->blocks_per_delay / 2;
 			fw->bpd2 = fw->blocks_per_delay;
 			fw->blocks_per_delay = (fw->bpd1 + fw->bpd2) / 2;
-			assert(fw->bpd1 > 0);
+			assert(fw->bpd1 >= 0);
+			/* The following should be true only when the kernel
+			 * is already too busy with the device.
+			 */
+			if (fw->bpd1 == 0) {
+				fw->bpd1++;
+				fw->bpd2++;
+				fw->blocks_per_delay++;
+			}
 			fw->state = FW_SEARCH;
 		} else if (delay < fw->delay_ms) {
 			fw->blocks_per_delay *= 2;
@@ -318,7 +328,7 @@ static int create_and_fill_file(const char *path, int number, size_t size,
 static inline uint64_t get_freespace(const char *path)
 {
 	struct statvfs fs;
-	assert(statvfs(path, &fs) == 0);
+	assert(!statvfs(path, &fs));
 	return (uint64_t)fs.f_frsize * (uint64_t)fs.f_bfree;
 }
 
@@ -342,6 +352,15 @@ static int fill_fs(const char *path, int progress)
 		return 1;
 	}
 
+	/* This sync is just to minimize the chance we'll misestimate
+	 * the writting speed, especially at beginning that can slow down
+	 * the whole process.
+	 * This issue was spotted on a large pen drive in which all fff files
+	 * were removed by function unlink_old_files, but the metadata
+	 * wasn't properly flushed before reaching here.
+	 */
+	sync();
+
 	init_flow(&fw, free_space, progress);
 	i = 0;
 	fine = 1;

utils.c

@@ -2,11 +2,11 @@
 
 const char *adjust_unit(double *ptr_bytes)
 {
-	char *units[] = { "Byte", "KB", "MB", "GB", "TB" };
+	const char *units[] = { "Byte", "KB", "MB", "GB", "TB", "PB", "EB" };
 	int i = 0;
 	double final = *ptr_bytes;
 
-	while (i < 5 && final >= 1024) {
+	while (i < 7 && final >= 1024) {
 		final /= 1024;
 		i++;
 	}
@@ -14,7 +14,7 @@ const char *adjust_unit(double *ptr_bytes)
 	return units[i];
 }
 
-#ifndef APPLE_MAC
+#ifdef APPLE_MAC
 
 #include <stdio.h>
 #include <stdint.h>

utils.h

@@ -27,24 +27,6 @@ static inline void get_full_fn(char *full_fn, int len,
 	assert(snprintf(full_fn, len, "%s/%s", path, filename) < len);
 }
 
-static inline void update_dt(struct timeval *dt, const struct timeval *t1,
-	const struct timeval *t2)
-{
-	dt->tv_sec  += t2->tv_sec  - t1->tv_sec;
-	dt->tv_usec += t2->tv_usec - t1->tv_usec;
-	if (dt->tv_usec >= 1000000) {
-		dt->tv_sec++;
-		dt->tv_usec -= 1000000;
-	}
-}
-
-static inline double dt_to_s(struct timeval *dt)
-{
-	double ret = (double)dt->tv_sec + ((double)dt->tv_usec / 1000000.);
-	assert(ret >= 0.);
-	return ret > 0. ? ret : 1.;
-}
-
 static inline long delay_ms(const struct timeval *t1, const struct timeval *t2)
 {
 	return	(t2->tv_sec  - t1->tv_sec)  * 1000 +