dima, Wed, 09 Nov 2011 10:01:13 +0900: > On 11/09/2011 12:12 AM, Chris Mason wrote: >> On Tue, Nov 08, 2011 at 10:01:51AM -0500, Chris Mason wrote: >>> On Tue, Nov 08, 2011 at 11:00:42AM +0900, dima wrote: >>>> On 11/08/2011 10:54 AM, Eric Griffith wrote: >>>>> On 11/7/2011 8:52 PM, Fajar A. Nugraha wrote: >>>>>> On Tue, Nov 8, 2011 at 8:06 AM, Eric >>>>>> Griffith<egriffit...@gmail.com> wrote: >>>>>>> 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 >>>>>> >>>>>> I think the original question was how to force uncompressed mode, >>>>>> whether specific to a file or to a whole filesystem, without having >>>>>> to reboot :) >>>>>> >>>>>> AFAIK there's no way to do that. >>>>>> >>>>>> >>>>> Whoops! Misunderstood the question haha. Yeah, as far as >>>>> decompressing just a single file; from what I've read, thats >>>>> impossible. >>>> >>>> >>>> Eric, Fajar, >>>> Thanks. Understood. >>>> >>>> Yes, it is possible to remove the compress flag from fstab, reboot >>>> and even do not do any defragmentation/rebalancing - just re-save the >>>> file and it will be saved uncompressed. This works. But only with >>>> reboot... >>> >>> chattr -c on the file should work (followed by defrag or rewriting the >>> file). I just retested and it seems to be broken right now. >>> >>> I'll track it down. >> >> Ok, I had forgotten. chattr -c clears the compression flag bug doesn't >> set the no compress flag. We looks like we need to patch chattr for >> this. >> >> -chris >> >> > > Just for the record - I could find a solution thanks to the btrfs wiki > being online again. In Gotchas it says > > mount -o nodatacow also disables compression > > and indeed it does. Remounting with this option and re-saving the file > makes it uncompressed. However, I could not find how to remount the > filesystem afterwards without nodatacow. > > ~dima
Sorry for possibly OT question - when I have historical btrfs system mounted with zlib compression, can I remount it with lzo ? What will happen? Will the COW be broken and the files taking duplicate space? Or will the Universe explode and be replaced with something even more bizzare? Thank you Lubos -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
