On 11/7/2011 7:55 PM, dima wrote:
On 11/07/2011 09:19 PM, Martin Steigerwald wrote:
Am Montag, 7. November 2011 schrieb dima:
Hello,
Hi Dima,
Is there any possibility to remount a compressed btrfs without any
compression at all?
Syslinux bootloader does not understand any btrfs compression and
whenever I edit syslinux.cfg on my compressed / subvolume, the file
becomes compressed and thus unreadable by syslinux on the next boot.
I tried to remount / without the 'compress' option (and edit
syslinux.cfg in uncompressed state) and while the "mount" command would
not show compression any more, I can see in the /proc/mounts that
compression is still there and the file still gets compressed after
editing. But there seem to be no mount option like compress=none or
something.
The only workaround I found is to boot from a live CD mount / without
any compression and re-save syslinux.cfg. Then it the file gets
uncompressed.
Are there any other options except for this workaround to temporarily
remount btrfs without compression?
What does lsattr show on the file? Have you tried chattr -c on the
file? It
might help to do a btrfs filesystem defrag on the file to remove
compression, cause I don´t think chattr -c itself will uncompress it.
Hi Martin,
Thanks for your reply.
Yes, I did check out lsattr. It shows that no flags are set. Setting
chattr +c then chattr -c and re-saving file has no effect either.
I also tried to defragment the file itself and the directory where it
was in without setting -c but it would not have any effect because / is
mounted with compression.
As far as I understand it is possible to individually set compression
on/off on single files.
Could not find how to turn it off though.
thanks
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Hey Dima, I know if you install a system without the compress flag
already done, you can force BTRFS to compress everything post-install by
teling it to "rebalance" the filesystem. I'm under Win7 right now so I
dont know the exact command. Check btrfs --help for that.
I dont know if it works in reverse, but you can definitely try it. Edit
your fstab, remove the compress flag, reboot. Tell btrfs to rebalance
the system, reboot again. And I -THINK- that'll decompress all the files
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