[PATCH v2] btrfs-progs: utils: negative numbers are more plausible than sizes over 8 EiB

[Zygo Blaxell]

I got tired of seeing "16.00EiB" whenever btrfs-progs encounters a
negative size value, e.g. during resize:

Unallocated:
   /dev/mapper/datamd18   16.00EiB

This version is much more useful:

Unallocated:
   /dev/mapper/datamd18  -26.29GiB

Signed-off-by: Zygo Blaxell <ce3g8...@umail.furryterror.org>

---
v2: change the function prototype so it's easier to see that the
mangling implied by the name "pretty" includes "reinterpretation
of the u64 value as a signed quantity."
---
 utils.c | 12 ++++++------
 utils.h |  4 ++--
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/utils.c b/utils.c
index 69b580a..07e8443 100644
--- a/utils.c
+++ b/utils.c
@@ -2575,7 +2575,7 @@ out:
  * Note: this function uses a static per-thread buffer. Do not call this
  * function more than 10 times within one argument list!
  */
-const char *pretty_size_mode(u64 size, unsigned mode)
+const char *pretty_size_mode(s64 size, unsigned mode)
 {
        static __thread int ps_index = 0;
        static __thread char ps_array[10][32];
@@ -2594,20 +2594,20 @@ static const char* unit_suffix_binary[] =
 static const char* unit_suffix_decimal[] =
        { "B", "kB", "MB", "GB", "TB", "PB", "EB"};
 
-int pretty_size_snprintf(u64 size, char *str, size_t str_size, unsigned 
unit_mode)
+int pretty_size_snprintf(s64 size, char *str, size_t str_size, unsigned 
unit_mode)
 {
        int num_divs;
        float fraction;
-       u64 base = 0;
+       s64 base = 0;
        int mult = 0;
        const char** suffix = NULL;
-       u64 last_size;
+       s64 last_size;
 
        if (str_size == 0)
                return 0;
 
        if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_RAW) {
-               snprintf(str, str_size, "%llu", size);
+               snprintf(str, str_size, "%lld", size);
                return 0;
        }
 
@@ -2642,7 +2642,7 @@ int pretty_size_snprintf(u64 size, char *str, size_t 
str_size, unsigned unit_mod
                           num_divs = 0;
                           break;
        default:
-               while (size >= mult) {
+               while ((size < 0 ? -size : size) >= mult) {
                        last_size = size;
                        size /= mult;
                        num_divs++;
diff --git a/utils.h b/utils.h
index 366ca29..525bde9 100644
--- a/utils.h
+++ b/utils.h
@@ -174,9 +174,9 @@ int check_mounted_where(int fd, const char *file, char 
*where, int size,
 int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
                                 int super_offset);
 
-int pretty_size_snprintf(u64 size, char *str, size_t str_bytes, unsigned 
unit_mode);
+int pretty_size_snprintf(s64 size, char *str, size_t str_bytes, unsigned 
unit_mode);
 #define pretty_size(size)      pretty_size_mode(size, UNITS_DEFAULT)
-const char *pretty_size_mode(u64 size, unsigned mode);
+const char *pretty_size_mode(s64 size, unsigned mode);
 
 u64 parse_size(char *s);
 u64 parse_qgroupid(const char *p);
-- 
2.1.4

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