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-rw-r--r--lib/string_helpers.c68
1 files changed, 48 insertions, 20 deletions
diff --git a/lib/string_helpers.c b/lib/string_helpers.c
index 8f8c4417f228..4a913ec3acf9 100644
--- a/lib/string_helpers.c
+++ b/lib/string_helpers.c
@@ -4,6 +4,7 @@
* Copyright 31 August 2008 James Bottomley
* Copyright (C) 2013, Intel Corporation
*/
+#include <linux/bug.h>
#include <linux/kernel.h>
#include <linux/math64.h>
#include <linux/export.h>
@@ -14,7 +15,8 @@
/**
* string_get_size - get the size in the specified units
- * @size: The size to be converted
+ * @size: The size to be converted in blocks
+ * @blk_size: Size of the block (use 1 for size in bytes)
* @units: units to use (powers of 1000 or 1024)
* @buf: buffer to format to
* @len: length of buffer
@@ -24,14 +26,14 @@
* at least 9 bytes and will always be zero terminated.
*
*/
-void string_get_size(u64 size, const enum string_size_units units,
+void string_get_size(u64 size, u64 blk_size, const enum string_size_units units,
char *buf, int len)
{
static const char *const units_10[] = {
- "B", "kB", "MB", "GB", "TB", "PB", "EB"
+ "B", "kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"
};
static const char *const units_2[] = {
- "B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"
+ "B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB", "YiB"
};
static const char *const *const units_str[] = {
[STRING_UNITS_10] = units_10,
@@ -42,31 +44,57 @@ void string_get_size(u64 size, const enum string_size_units units,
[STRING_UNITS_2] = 1024,
};
int i, j;
- u32 remainder = 0, sf_cap;
+ u32 remainder = 0, sf_cap, exp;
char tmp[8];
+ const char *unit;
tmp[0] = '\0';
i = 0;
- if (size >= divisor[units]) {
- while (size >= divisor[units]) {
- remainder = do_div(size, divisor[units]);
- i++;
- }
+ if (!size)
+ goto out;
- sf_cap = size;
- for (j = 0; sf_cap*10 < 1000; j++)
- sf_cap *= 10;
+ while (blk_size >= divisor[units]) {
+ remainder = do_div(blk_size, divisor[units]);
+ i++;
+ }
- if (j) {
- remainder *= 1000;
- remainder /= divisor[units];
- snprintf(tmp, sizeof(tmp), ".%03u", remainder);
- tmp[j+1] = '\0';
- }
+ exp = divisor[units] / (u32)blk_size;
+ if (size >= exp) {
+ remainder = do_div(size, divisor[units]);
+ remainder *= blk_size;
+ i++;
+ } else {
+ remainder *= size;
+ }
+
+ size *= blk_size;
+ size += remainder / divisor[units];
+ remainder %= divisor[units];
+
+ while (size >= divisor[units]) {
+ remainder = do_div(size, divisor[units]);
+ i++;
}
+ sf_cap = size;
+ for (j = 0; sf_cap*10 < 1000; j++)
+ sf_cap *= 10;
+
+ if (j) {
+ remainder *= 1000;
+ remainder /= divisor[units];
+ snprintf(tmp, sizeof(tmp), ".%03u", remainder);
+ tmp[j+1] = '\0';
+ }
+
+ out:
+ if (i >= ARRAY_SIZE(units_2))
+ unit = "UNK";
+ else
+ unit = units_str[units][i];
+
snprintf(buf, len, "%u%s %s", (u32)size,
- tmp, units_str[units][i]);
+ tmp, unit);
}
EXPORT_SYMBOL(string_get_size);