From mboxrd@z Thu Jan 1 00:00:00 1970 From: dima Subject: Re: How to remount btrfs without compression? Date: Tue, 8 Nov 2011 09:55:29 +0900 Message-ID: <4EB87E01.1040704@parallels.com> References: <4EB72C1B.1030702@parallels.com> (sfid-20111107_092907_276831_5BC15106) <201111071319.14493.Martin@lichtvoll.de> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed To: Return-path: In-Reply-To: <201111071319.14493.Martin@lichtvoll.de> List-ID: 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 wo= uld >> 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=3Dnone o= r >> something. >> >> The only workaround I found is to boot from a live CD mount / withou= t >> any compression and re-save syslinux.cfg. Then it the file gets >> uncompressed. >> >> Are there any other options except for this workaround to temporaril= y >> remount btrfs without compression? > > What does lsattr show on the file? Have you tried chattr -c on the fi= le? It > might help to do a btrfs filesystem defrag on the file to remove > compression, cause I don=C2=B4t think chattr -c itself will uncompres= s it. Hi Martin, Thanks for your reply. Yes, I did check out lsattr. It shows that no flags are set. Setting=20 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=20 was in without setting -c but it would not have any effect because / is= =20 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 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" = in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html