[PATCH v3] lib: add size unit t/p/e to memparse

[Gui Hecheng]

For modern filesystems such as btrfs, t/p/e size level operations
are common.
add size unit t/p/e parsing to memparse

Signed-off-by: Gui Hecheng <guihc.fnst@xxxxxxxxxxxxxx>
---
changelog
	v1->v2: replace kilobyte with kibibyte, and others
	v2->v3: add missing unit "bytes" in comment
---
 lib/cmdline.c | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/lib/cmdline.c b/lib/cmdline.c
index eb67911..511b9be 100644
--- a/lib/cmdline.c
+++ b/lib/cmdline.c
@@ -119,11 +119,17 @@ char *get_options(const char *str, int nints, int *ints)
  *	@retptr: (output) Optional pointer to next char after parse completes
  *
  *	Parses a string into a number.  The number stored at @ptr is
- *	potentially suffixed with %K (for kilobytes, or 1024 bytes),
- *	%M (for megabytes, or 1048576 bytes), or %G (for gigabytes, or
- *	1073741824).  If the number is suffixed with K, M, or G, then
- *	the return value is the number multiplied by one kilobyte, one
- *	megabyte, or one gigabyte, respectively.
+ *	potentially suffixed with
+ *	%K (for kibibytes, or 1024 bytes),
+ *	%M (for mebibytes, or 1048576 bytes),
+ *	%G (for gibibytes, or 1073741824 bytes),
+ *	%T (for tebibytes, or 1099511627776 bytes),
+ *	%P (for pebibytes, or 1125899906842624 bytes),
+ *	%E (for exbibytes, or 1152921504606846976 bytes).
+ *	If the number is suffixed with K, M, G, T, P, E, then
+ *	the return value is the number multiplied by one kibibyte, one
+ *	mebibyte, one gibibyte, one tebibyte, one pebibyte, one exbibyte,
+ *	respectively.
  */
 
 unsigned long long memparse(const char *ptr, char **retptr)
@@ -133,6 +139,15 @@ unsigned long long memparse(const char *ptr, char **retptr)
 	unsigned long long ret = simple_strtoull(ptr, &endptr, 0);
 
 	switch (*endptr) {
+	case 'E':
+	case 'e':
+		ret <<= 10;
+	case 'P':
+	case 'p':
+		ret <<= 10;
+	case 'T':
+	case 't':
+		ret <<= 10;
 	case 'G':
 	case 'g':
 		ret <<= 10;
-- 
1.8.1.4

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