Hello guys!
Is there any way to resize the root partition on boot?
Thank you in advance!
Topic: Resize Rootfs
The content of this topic has been archived on 6 May 2018. There are no obvious gaps in this topic, but there may still be some posts missing at the end.
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The likely answer is no.
* The root partition contains kernel and the other files contained in the flashed firmware image. That part is read-only squashfs partition. And it can bee seen as /rom in a live router.
* The remaining free flash space is used for "/overlay" jffs2 partition that will contain all your personal settings, edited files, packages installed later etc.
* overlayfs then places /overlay on top of /rom, to be the actual / in a live router. Net effect is that the files from /overlay override the files in the original /rom. (e.g. there is /etc/abc in /rom and you edit it. The edited files is actually placed to /overlay, while the original one in /rom stays intact.)
E.g. in my router, the rootfs is 5120 kB and the /overlay is some 9600 kB.
root@OpenWrt:~# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/root 5120 5120 0 100% /rom
tmpfs 62884 1112 61772 2% /tmp
/dev/mtdblock5 9600 460 9140 5% /overlay
overlayfs:/overlay 9600 460 9140 5% /
tmpfs 512 0 512 0% /devWhat are you attempting to do?
(Last edited by hnyman on 9 Oct 2015, 12:13)
hnyman wrote:
The likely answer is no.
* The root partition contains kernel and the other files contained in the flashed firmware image. That part is read-only squashfs partition. And it can bee seen as /rom in a live router.
* The remaining free flash space is used for "/overlay" jffs2 partition that will contain all your personal settings, edited files, packages installed later etc.
* overlayfs then places /overlay on top of /rom, to be the actual / in a live router. Net effect is that the files from /overlay override the files in the original /rom. (e.g. there is /etc/abc in /rom and you edit it. The edited files is actually placed to /overlay, while the original one in /rom stays intact.)E.g. in my router, the rootfs is 5120 kB and the /overlay is some 9600 kB.
root@OpenWrt:~# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/root 5120 5120 0 100% /rom tmpfs 62884 1112 61772 2% /tmp /dev/mtdblock5 9600 460 9140 5% /overlay overlayfs:/overlay 9600 460 9140 5% / tmpfs 512 0 512 0% /devWhat are you attempting to do?
I have 500 Mb available in my disk and rootfs has only 50 Mb so I'm trying to expand in order to use that free space.
luisf wrote:
I have 500 Mb available in my disk and rootfs has only 50 Mb so I'm trying to expand in order to use that free space.
What type of filesystem is used? Please login into your device as root, run mount, and provide its output here.
mazilo wrote:
luisf wrote:I have 500 Mb available in my disk and rootfs has only 50 Mb so I'm trying to expand in order to use that free space.
What type of filesystem is used? Please login into your device as root, run mount, and provide its output here.
If I type fdisk
Device Boot Start End Sectors Size Id Type
/dev/mmcblk0p1 * 8192 49151 40960 20M c W95 FAT32 (LBA)
/dev/mmcblk0p2 57344 155647 98304 48M 83 Linux
If I type df
Filesystem 1K-blocks Used Available Use% Mounted on
rootfs 47636 8096 38560 17% /
/dev/root 47636 8096 38560 17% /
tmpfs 476532 1056 475476 0% /tmp
tmpfs 512 0 512 0% /dev
The discussion might have continued from here.
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