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| author |   Joshua Watt <jpewhacker@gmail.com> | 2018-10-11 13:09:04 -0500 |
|---|---|---|
| committer |   Richard Purdie <richard.purdie@linuxfoundation.org> | 2018-10-12 08:44:05 +0100 |
| commit | 370fda1b2e8d5dc011522131bba4106de26bfb19 (patch) | |
| tree | 91617a296e6001b7b87bc53880ca390a107b71f4 /meta/recipes-core/initscripts/initscripts-1.0 | |
| parent | 9800daf59d2235bc492d1aeb600e46ad62303510 (diff) | |
| download | openembedded-core-contrib-370fda1b2e8d5dc011522131bba4106de26bfb19.tar.gz | |
initscripts: read-only-rootfs-hook: Use overlay if available
Copying files from the read-only /var/lib to tmpfs can be slow and waste
memory. If the kernel supports the overlay file system, use it to mount
a writable tmpfs on top of the read-only /var/lib and avoid the file
copy.
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Diffstat (limited to 'meta/recipes-core/initscripts/initscripts-1.0')
| -rw-r--r-- | meta/recipes-core/initscripts/initscripts-1.0/read-only-rootfs-hook.sh | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/meta/recipes-core/initscripts/initscripts-1.0/read-only-rootfs-hook.sh b/meta/recipes-core/initscripts/initscripts-1.0/read-only-rootfs-hook.sh index 1a0328d63e..bd445ddb07 100644 --- a/meta/recipes-core/initscripts/initscripts-1.0/read-only-rootfs-hook.sh +++ b/meta/recipes-core/initscripts/initscripts-1.0/read-only-rootfs-hook.sh @@ -31,8 +31,13 @@ if [ "$1" = "start" ] ; then if [ `is_on_read_only_partition /var/lib` = "yes" ]; then grep -q "tmpfs /var/volatile" /proc/mounts || mount /var/volatile mkdir -p /var/volatile/lib - cp -a /var/lib/* /var/volatile/lib - mount --bind /var/volatile/lib /var/lib + mkdir -p /var/volatile/.lib-work + # Try to mount using overlay, which is much faster than copying + # files. If that fails, fallback to the slower copy + if ! mount -t overlay overlay -olowerdir=/var/lib,upperdir=/var/volatile/lib,workdir=/var/volatile/.lib-work /var/lib > /dev/null 2>&1; then + cp -a /var/lib/* /var/volatile/lib + mount --bind /var/volatile/lib /var/lib + fi fi fi |