From: Yann E. MORIN <yann.morin.1998@free.fr>
Date: Mon, 3 Jul 2017 22:51:01 +0000 (+0200)
Subject: package/mke2img: add option to specify block size
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=221808810d546e6808c48ec09383bd161d995be5;p=buildroot.git

package/mke2img: add option to specify block size

ext filesystems can use a block size of 1024, 2048, or 4096 bytes, the
former being interesting to store small files, while the latter being
more intersting to store bigger files.

So far, we were using the default, which was to use a 1024-byte block.
Continue doing so (for now...).

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---

diff --git a/fs/ext2/ext2.mk b/fs/ext2/ext2.mk
index 16e14777c3..0d5fc7f118 100644
--- a/fs/ext2/ext2.mk
+++ b/fs/ext2/ext2.mk
@@ -12,6 +12,7 @@ EXT2_LABEL := $(subst ",,$(BR2_TARGET_ROOTFS_EXT2_LABEL))
 EXT2_OPTS = \
 	-G $(BR2_TARGET_ROOTFS_EXT2_GEN) \
 	-R $(BR2_TARGET_ROOTFS_EXT2_REV) \
+	-B 1024 \
 	-b $(BR2_TARGET_ROOTFS_EXT2_BLOCKS) \
 	-i $(BR2_TARGET_ROOTFS_EXT2_INODES) \
 	-I $(BR2_TARGET_ROOTFS_EXT2_EXTRA_INODES) \
diff --git a/package/mke2img/mke2img b/package/mke2img/mke2img
index 266df483aa..399012a2be 100755
--- a/package/mke2img/mke2img
+++ b/package/mke2img/mke2img
@@ -19,9 +19,10 @@ main() {
     rev=1
     nb_extra_inodes=0
 
-    while getopts :hb:i:I:r:d:o:G:R:l:u: OPT; do
+    while getopts :hB:b:i:I:r:d:o:G:R:l:u: OPT; do
         case "${OPT}" in
         h)  help; exit 0;;
+        B)  block_size="${OPTARG}";;
         b)  nb_blocks=${OPTARG};;
         i)  nb_inodes=${OPTARG};;
         I)  nb_extra_inodes=${OPTARG};;
@@ -47,6 +48,11 @@ main() {
     if [ -z "${nb_blocks}" ]; then
         error "you must specify the size of the output image with '-b'\n"
     fi
+    case "${block_size}" in
+    1024|2048|4096) ;; # Sole valid values
+    '') error "you must specify the size of a block with -B\n";;
+    *)  error "invalid block size '%s' (valid: 1024. 2048, 4096)\n" "${block_size}";;
+    esac
     case "${gen}:${rev}" in
     2:0|2:1|3:1|4:1)
         ;;
@@ -91,7 +97,7 @@ main() {
     fi
 
     # Generate the filesystem
-    genext2fs_opts=( -z -b ${nb_blocks} -N ${nb_inodes} -d "${root_dir}" )
+    genext2fs_opts=( -z -B ${block_size} -b ${nb_blocks} -N ${nb_inodes} -d "${root_dir}" )
     if [ -n "${nb_res_blocks}" ]; then
         genext2fs_opts+=( -m ${nb_res_blocks} )
     fi