Re: Files/Folders invisibles with 'ls -a' but can 'cd' to folder

[Qu Wenruo <quwenruo.btrfs@gmx.com>]

On 2021/8/4 下午9:19, k g wrote:
> Hi
>
>
> As I say in my subject, I'm facing a weird problem with my btrfs
> partition (I already sent this message on reddit /r/btrfs/ )

Sorry, reddit is not really the go-to place for technical discussion nor
bug report.

>
> It's in fact a btrfs partition in a raid5 synology system.

We don't know how heavily backported the synology kernel is, thus it's
normally better to ask for help from synology.

>
>
>
> 3 days ago, the volume 'crashed' (synology terms) ,however SMART data is
> ok and I don't have sector relcocation errors or CRC.... I rebooted
> several times , and after dozen of reboots my partition shows up , but 3
> TB of 10 TB are missing, I made a scrub but it did made my missing files
> appears.
>
>
>
> desperately I made a 'cd xyz' in a directory (I remember some of the
> folder names) and it works ; and inside this folder I can do "ls" and
> all files and subfolders appears .
>
> I made a copy elsewhere of some files and these ones are not corrupted
> or bit roted.
>
>
>
> I don't want to make a btrfs check --repair of course.

But "btrfs check" without --repair should be the best tool to show
what's going wrong.

Alternatively, "btrfs check --mode=lowmem" could provide a better human
readable output.

>
>
>
> Is there a way to "relink" indexes/root or whatever it is called to
> bring back these files/folder visible and accessible with a safe command ?

It's not that simple, from your description, it looks like the dir has
some DIR_ITEM but no DIR_INDEX, thus it doesn't shows up in ls, but cd
still work.

This normally indicates much bigger problem.

Thanks,
Qu
>
> I'm planning to backup all , is 'btrfs restore' will access to these
> "non visible" directories ?
>
>
>
> "I saw similar case here : The Directory Who Wasn't There : btrfs
> (reddit.com) , but I can't find a reply that solve the problem"
>
>
>
> cdly
>