tools/dosfstools/patches/0001-mkfs-Default-to-64-32-heads-sectors-for-targets-smal.patch

   1 From 1e76e5778a1885452939a79d9145b80634a5b023 Mon Sep 17 00:00:00 2001
   2 From: Andreas Bombe <aeb@debian.org>
   3 Date: Wed, 11 May 2016 03:44:58 +0200
   4 Subject: [PATCH] mkfs: Default to 64/32 heads/sectors for targets smaller than
   5  512 MB
   6
   7 This may put defaults in certain use cases a little bit more in line
   8 with the old defaults in versions up to 3.0.28. It has mostly aesthetic
   9 value in most cases.
  10
  11 Signed-off-by: Andreas Bombe <aeb@debian.org>
  12 ---
  13  src/mkfs.fat.c | 10 ++++++++++
  14  1 file changed, 10 insertions(+)
  15
  16 diff --git a/src/mkfs.fat.c b/src/mkfs.fat.c
  17 index 8a320fd..bad492b 100644
  18 --- a/src/mkfs.fat.c
  19 +++ b/src/mkfs.fat.c
  20 @@ -519,6 +519,16 @@ static void establish_params(struct device_info *info)
  21      unsigned int cluster_size = 4;  /* starting point for FAT12 and FAT16 */
  22      int def_root_dir_entries = 512;
  23
  24 +    if (info->size < 512 * 1024 * 1024) {
  25 +       /*
  26 +        * These values are more or less meaningless, but we can at least
  27 +        * use less extreme values for smaller filesystems where the large
  28 +        * dummy values signifying LBA only access are not needed.
  29 +        */
  30 +       sec_per_track = 32;
  31 +       heads = 64;
  32 +    }
  33 +
  34      if (info->type != TYPE_FIXED) {
  35         /* enter default parameters for floppy disks if the size matches */
  36         switch (info->size / 1024) {
  37 --
  38 2.1.4
  39