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谁能帮我看一下openwrt的分区？

作者：卡卷网发布时间：2025-02-18 21:49浏览数量：225次评论数量：0次

概要

使用一个编译好的Openwrt 固件烧写系统启动后，发现用户分区只有812M，但实际上硬件eMMC存储为32G,可以通过修改固件分区表来调整，但是比较麻烦，本文验证一种更为简便的方法来找回消失的eMMc存储。

问题分析

启动系统后查看分区信息如下：

#df -h Filesystem Size Used Avail Use% Mounted on /dev/root 812M 664M 91M 88% / tmpfs 512K 0 512K 0% /dev tmpfs 987M 19M 968M 2% /tmp cgroup 987M 0 987M 0% /sys/fs/cgroup #lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS mmcblk0 179:0 0 28.9G 0 disk ├─mmcblk0p1 179:1 0 4M 0 part ├─mmcblk0p2 179:2 0 4M 0 part ├─mmcblk0p3 179:3 0 64M 0 part ├─mmcblk0p4 179:4 0 64M 0 part ├─mmcblk0p5 179:5 0 32M 0 part ├─mmcblk0p6 179:6 0 6G 0 part / ├─mmcblk0p7 179:7 0 128M 0 part └─mmcblk0p8 179:8 0 22.6G 0 part mmcblk0boot0 179:32 0 4M 1 disk mmcblk0boot1 179:64 0 4M 1 disk zram0 254:0 0 0B 0 disk

可以看出，分区mmcblk0p6被挂载为根分区，22.6G的mmcblk0p8闲在那儿呢。

解决

执行下以命令，挂载mmcblk0p8，发现并未显示实际大小。

mount /dev/mmcblk0p8 /mnt/ df -h Filesystem Size Used Avail Use% Mounted on /dev/root 812M 664M 91M 88% / tmpfs 512K 0 512K 0% /dev tmpfs 987M 20M 967M 2% /tmp cgroup 987M 0 987M 0% /sys/fs/cgroup /dev/mmcblk0p8 23G 24K 21G 1% /mnt #df -h Filesystem Size Used Avail Use% Mounted on /dev/root 812M 664M 91M 88% / tmpfs 512K 0 512K 0% /dev tmpfs 987M 19M 968M 2% /tmp cgroup 987M 0 987M 0% /sys/fs/cgroup /dev/mmcblk0p8 4.0M 283K 3.5M 8% /mnt

先对/dev/mmcblk0p8进行格式化，再次重新mount后分区大小显示正常了。

#mkfs.ext4 /dev/mmcblk0p8 mke2fs 1.46.5 (30-Dec-2021) /dev/mmcblk0p8 contains a ext2 file system labelled 'userdata' last mounted on Wed Dec 20 16:54:25 2023 Proceed anyway? (y,N) y Discarding device blocks: done Creating filesystem with 5926904 4k blocks and 1482752 inodes Filesystem UUID: af5f8523-e705-4b11-8615-7c28df16aecb Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 4096000 Allocating group tables: done Writing inode tables: done Creating journal (32768 blocks): done Writing superblocks and filesystem accounting information: done #umount /mnt/ #mount /dev/mmcblk0p8 /mnt/ # df -h Filesystem Size Used Avail Use% Mounted on /dev/root 812M 664M 91M 88% / tmpfs 512K 0 512K 0% /dev tmpfs 987M 20M 967M 2% /tmp cgroup 987M 0 987M 0% /sys/fs/cgroup /dev/mmcblk0p8 23G 24K 21G 1% /mnt # lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS mmcblk0 179:0 0 28.9G 0 disk ├─mmcblk0p1 179:1 0 4M 0 part ├─mmcblk0p2 179:2 0 4M 0 part ├─mmcblk0p3 179:3 0 64M 0 part ├─mmcblk0p4 179:4 0 64M 0 part ├─mmcblk0p5 179:5 0 32M 0 part ├─mmcblk0p6 179:6 0 6G 0 part / ├─mmcblk0p7 179:7 0 128M 0 part └─mmcblk0p8 179:8 0 22.6G 0 part /root mmcblk0boot0 179:32 0 4M 1 disk mmcblk0boot1 179:64 0 4M 1 disk zram0 254:0 0 0B 0 disk

配置永久生效

先导出fstab配置。

#block detect > /etc/config/fstab #cat /etc/config/fstab config 'global' option anon_swap '0' option anon_mount '0' option auto_swap '1' option auto_mount '1' option delay_root '5' option check_fs '0' config 'mount' option target '/mnt' option uuid 'af5f8523-e705-4b11-8615-7c28df16aecb' option enabled '0'

修改/etc/config/fstab内容如下，使能系统自动mount mmcblk0p8到 /root。

config 'mount' option target '/root' option uuid 'af5f8523-e705-4b11-8615-7c28df16aecb' option enabled '1'

重启系统后生效，

# df -h Filesystem Size Used Avail Use% Mounted on /dev/root 812M 608M 147M 81% / tmpfs 512K 0 512K 0% /dev tmpfs 987M 18M 969M 2% /tmp cgroup 987M 0 987M 0% /sys/fs/cgroup /dev/mmcblk0p8 23G 57M 21G 1% /root

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