[OpenWrt-Devel] fstools: factory reset on power failure during startup
eckert.florian at googlemail.com
Thu Nov 26 03:24:29 EST 2015
I am using openwrt CC and an ubifs filesystem on top of ubi.
If I plug off the power during startup, some times my configuration
get lost and i am back to factory reset.
In the package fstools there is the bin "mount_root" it is called
twice during startup.
1. S10boot at line 10
2. S95done at line 6
this calles edit the ./fs_state link
Because ubifs is doing filesystem handling in a background process
"ubi_bgt0d", could it be possible,
that (see code) ./.fs_state is not rewritten written anymore?
So that at next boot the system thinks he is in upgrade mode?
If I add a sleep(10) between unlink and symlink function call i can
reproduce the failure if i unplug the power.
I think the first think what should be done is to call
"snprintf(valstr, sizeof(valstr), "%d", state);" before "unlink(path).
Or this this a deeper Problem?
int fs_state_set(const char *dir, enum fs_state state)
-> path = alloca(strlen(dir) + 1 + sizeof("/.fs_state"));
-> sprintf(path, "%s/.fs_state", dir);
-> snprintf(valstr, sizeof(valstr), "%d", state);
return symlink(valstr, path);
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