admin@RT-AX56U_V2-4F08:/jffs# df -h
Filesystem Size Used Available Use% Mounted on
/dev/root 25.6M 25.6M 0 100% /
devtmpfs 122.3M 0 122.3M 0% /dev
tmpfs 122.4M 380.0K 122.1M 0% /var
tmpfs 122.4M 7.0M 115.5M 6% /tmp/mnt
ubi1:data 1.0M 64.0K 880.0K 7% /data
tmpfs 122.4M 7.0M 115.5M 6% /tmp/mnt
tmpfs 122.4M 7.0M 115.5M 6% /tmp
/dev/mtdblock9 15.0M 15.0M 0 100% /jffs
设备满了排查发现./.sys/diag_db 占用那么大
admin@RT-AX56U_V2-4F08:/jffs/.sys/diag_db# rm -rf conn_diag_1680566400.db-journal
rm: can't remove 'conn_diag_1680566400.db-journal': No space left on device
删都删不掉
admin@RT-AX56U_V2-4F08:/jffs/.sys/diag_db# ls
conn_diag_1680566400.db-journal conn_diag_1681689600.db conn_diag_1681776000.db
好像是梅林自带的服务
似乎jffs分区删除文件也会增加占用的空间
只能dd出来删了然后dd回去
参考
https://www.snbforums.com/threads/fix-full-jffs-without-factory-reset.66035/
https://wiki.emacinc.com/wiki/Mounting_JFFS2_Images_on_a_Linux_PC
dd /dev/mtdblock9 到tmp里然后电脑上开ftp服务，用路由器自带的ftpget和ftpput传文件，在电脑上删除里面的文件
apt install mtd-utils
# cleanup if necessary
umount /dev/mtdblock0
modprobe -r mtdram
modprobe -r mtdblock
modprobe mtdram total_size=50000 erase_size=128
modprobe mtdblock
dd if=original.jffs2 of=/dev/mtdblock0
mkdir jffs_mount
mount -t jffs2 /dev/mtdblock0 jffs_mount
删除文件后
mkfs.jffs2 -r jffs_mount --eraseblock=0x20000 --pad=0x2f00000 -o trimmed.jffs2
参数去/proc/mtd里面找
cat /proc/mtd
dev: size erasesize name
mtd0: 05f00000 00020000 "rootfs"
mtd1: 05f00000 00020000 "rootfs_update"
mtd2: 00800000 00020000 "data"
mtd3: 00100000 00020000 "nvram"
mtd4: 05f00000 00020000 "image"
mtd5: 05f00000 00020000 "image_update"
mtd6: 10000000 00020000 "dummy1"
mtd7: 10000000 00020000 "dummy2"
mtd8: 00100000 00020000 "misc3"
mtd9: 02f00000 00020000 "misc2"
mtd10: 00800000 00020000 "misc1"
mtd11: 05638000 0001f000 "rootfs_ubifs"
mtd12: 0001f000 0001f000 "METADATA"
mtd13: 0001f000 0001f000 "METADATACOPY"
mtd14: 003421d0 0001f000 "filestruct_full.bin"
mtd15: 006c8000 0001f000 "data"
然后ftp回路由器，dd回/dev/mtdblock9
Filesystem Size Used Available Use% Mounted on
/dev/root 25.6M 25.6M 0 100% /
devtmpfs 122.3M 0 122.3M 0% /dev
tmpfs 122.4M 204.0K 122.2M 0% /var
tmpfs 122.4M 4.5M 117.9M 4% /tmp/mnt
ubi1:data 1.0M 64.0K 880.0K 7% /data
tmpfs 122.4M 4.5M 117.9M 4% /tmp/mnt
tmpfs 122.4M 4.5M 117.9M 4% /tmp
/dev/mtdblock9 15.0M 10.1M 4.9M 67% /jffs
现在恢复正常了，但没有从根本上解决问题，那个conn_diag怎么关闭还是个问题
admin@RT-AX56U_V2-4F08:/jffs/.sys/diag_db# ps w|grep diag
2450 admin 13324 S conn_diag
8326 admin 3212 S grep diag
lrwxrwxrwx 1 admin root 2 Jun 21 2021 conn_diag -> rc
conn_diag是软链接，rc程序没法删，源码也找不到，conn_diag.o貌似不开源，直接链接到rc里的。
找了一圈网上编译固件的教程都是把conn_diag.c注释掉的
admin@RT-AX56U_V2-4F08:/jffs/.sys# rm -r diag_db/
admin@RT-AX56U_V2-4F08:/jffs/.sys# ln -s /tmp/diag_db diag_db
建了个软链接把日志放tmp里面文章来源：https://www.toymoban.com/news/detail-533788.html
算是解决了文章来源地址https://www.toymoban.com/news/detail-533788.html
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