"Jrgen_P._Tjern":
> The thing that's acting up is a dir handle. I opendir() it, and I can
> read fine from it. A bit later in the programs execution, and readdir()
> returns NULL (right after I rewinddir()), and errno is not set.
So your application calls,
{
opendir();
readdir();
/* do something */
rewinddir();
readdir(); // returns NULL illegally
}
> I'm trying to figure out what's wrong, and I'm starting to consider two
> viable options: memory error or aufs. Could this be the doing of aufs?
> Any way to debug it on a bit lower level? Any suggestions?
First, you need to check whether the second readdir(3) issues
getdents(2) or not. Try strace. Also check it arguments, especially the
i/o position in the dir.
If getdents(2) is called and the potision is 0 (ie. rewinded correctly),
then try aufs debug output such like this.
You need to enable CONFIG_AUFS_DEBUG. It will print debug messages to
syslog.
fs/aufs/dir.c:
static int aufs_readdir(struct file *file, void *dirent, filldir_t filldir)
{
au_debug_on();
;;;
au_debug_off();
}
Junjiro Okajima
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