Re: Will "btrfs check --repair" fix the mounting problem?

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2015-12-11 21:24 GMT+03:00 Chris Murphy <lists@xxxxxxxxxxxxxxxxx>:
> I would not repair it if the risk of it getting worse is bad for your data.
>
> Note the wiki says this feature is not well tested and is reported to
> not work reliably.
> https://btrfs.wiki.kernel.org/index.php/Conversion_from_Ext3
>
> Qu is working on patches to fix some of these problems, I don't know
> the status of any of that. I just did a conversion myself the other
> day with kernel 4.4.0rc3 and btrfs-progs 4.3.1 and that worked without
> error. But there were also no big files at all (it was just a clean OS
> installation). I immediately took a snapshot of that, and btrfs
> send/receive it to a new Btrfs volume, and then discarded the
> converted one entirely.
>
> The trace looks like it's mounting read-only? If it can be mounted
> read only, get the important data off the volume if it's not already
> backed up, and then blow it away. I personally wouldn't bother with
> repairing it.

What is the better way to get data? send/receive works only with RO
snapshots. Is there another way to preserve subvolumes and CoW
structure (a lot of files was copied between subvols using "cp
--reflink=always")? Or just rsync'ing files is all what I can do?
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