[systemd-devel] [PATCH 3/3] Add a new tmpfiles.d snippets to set the NOCOW the journal.

[Goffredo Baroncelli]

On 2015-03-08 15:34, Zbigniew Jędrzejewski-Szmek wrote:
> On Sun, Mar 08, 2015 at 12:48:27PM +0100, Goffredo Baroncelli wrote:
>> From: Goffredo Baroncelli <kreijack at inwind.it>
>>
>> Add a new tmpfiles.d snippets to set the NOCOW attributes for the
>> journal files. This allow better perfomance when the root file system
>> is BTRFS. Pay attention that the NOCOW flags disables the checksum and
>> prevent scrub to rebuild a corruputed journal.
>>
>> Signed-off-by: Goffredo Baroncelli <kreijack at inwind.it>
> Please drop the SOB.
> 
>> +# set the journal file as NOCOW; only valid for BTRFS filesystem
>> +h /var/log/journal/%m - - - - +C
> Shouldn't this be 'H'?

Hi,
if a directory is marked as +C, each *new* files inherited the NOCOW flag:

$ mkdir test
$ lsattr -d test/
---------------- test/
$ dd if=/dev/zero of=test/one bs=1M count=1
$ lsattr -a test
---------------- test/.
---------------- test/..
---------------- test/one
$ chattr +C test
$ dd if=/dev/zero of=test/two bs=1M count=1
$ lsattr -a test
---------------C test/.
---------------- test/..
---------------- test/one
---------------C test/two

> Zbyszek
> 
Goffredo


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