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authorGravatar Yann E. MORIN <yann.morin.1998@free.fr>2014-12-08 19:41:04 +0100
committerGravatar Thomas Petazzoni <thomas.petazzoni@free-electrons.com>2014-12-29 19:04:06 +0100
commitfbd244c277bfeca4f0dc58286be4f55780cdbbc2 (patch)
tree77583e6c298654a73e7c5edc3e15c6fc6ea75d36 /package/mke2img
parent64f94d1109ea950e64cf6bbf14df9ed776ad308e (diff)
downloadbuildroot-fbd244c277bfeca4f0dc58286be4f55780cdbbc2.tar.gz
buildroot-fbd244c277bfeca4f0dc58286be4f55780cdbbc2.tar.bz2
package/mke2img: always create sparse files
When the user specifies a number of blocks (and we do not auto-compute them), the generated filesystem can be quite large with large zones with only zeroes in them. Thus, always create the filesystem as a sparse file. Sparse files behave the same as normal files, except those long runs of zeroes do not actually use space on the (host) filesystem. Also, this should not break current behaviour, as neither cp nor dd nor cat preserve sparseness by default. So users relying on the zeroed parts to actually be written won;t see a change. Users that were expressly using cp or dd to copy files to a sparse destination will however see a little bit of improvements, as the zeroed out parts won't even be read from disk. Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Reviewed-by: Samuel Martin <s.martin49@gmail.com> Tested-by: Karoly Kasza <kaszak@gmail.com> Reviewed-by: Karoly Kasza <kaszak@gmail.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Diffstat (limited to 'package/mke2img')
-rwxr-xr-xpackage/mke2img/mke2img2
1 files changed, 1 insertions, 1 deletions
diff --git a/package/mke2img/mke2img b/package/mke2img/mke2img
index e93d8695ee..68da6ed5ee 100755
--- a/package/mke2img/mke2img
+++ b/package/mke2img/mke2img
@@ -100,7 +100,7 @@ main() {
fi
# Generate the filesystem
- genext2fs_opts=( -b ${nb_blocks} -N ${nb_inodes} -d "${root_dir}" )
+ genext2fs_opts=( -z -b ${nb_blocks} -N ${nb_inodes} -d "${root_dir}" )
if [ -n "${nb_res_blocks}" ]; then
genext2fs_opts+=( -m ${nb_res_blocks} )
fi