Re: subvolume / folder compression flag

[Austin S Hemmelgarn <ahferroin7@gmail.com>]

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On 2014-12-13 21:59, Ali AlipourR wrote:
> Hi,
>
> 1- Do setting compression flag per subvolume is implemented?
> (I did read on wiki that it is not implemented, but I can set it via
> "btrfs  property")
AFAIK, it's the compression related mount options that don't work 
per-subvolume.  Using chattr +c or btrfs properties should work (I don't 
know if btrfs properties are inherited by default though).
>
> 2- If I set compression flag via "btrfs property" or "chattr" on a
> subvolume, and rsync files without compression flag from ext4 file
> system and preserve attributes by rsync -AX, do these files on that
> btrfs subvolume will be compressed?
> I mean do files will be compressed even if their compression flag
> wasn't set, and just their subvolume compression flag was set?
>
> 3- what if I do same as 2 but on normal folder instead of subvolume
> (chattr +c that folder), Do files within that folder will be
> compressed even if their compression flag wasn't set?
These depend on many things.  Using -A won't (barring bugs in rsync) 
affect anything set by either chattr or btrfs properties.  Using -X 
MIGHT clear the btrfs properties, but I don't think it affects stuff set 
by chattr unless you are root (I know that it doesn't preserve 
immutability or append-only flags unless you are root).  In both 2 and 
3, I believe that the files will be uncompressed on the btrfs volume.


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