On Wed, Mar 16, 2016 at 11:20 AM, Neal Becker <ndbecker2@xxxxxxxxx> wrote: > If I had known that, I might not have chosen btrfs for my filesystems. Came > as a rude surprise when I suddenly needed more swap space, and couldn't do > it. You might check the FAQ and also the Gotchas list to make sure you're not missing something else. https://btrfs.wiki.kernel.org/index.php/FAQ https://btrfs.wiki.kernel.org/index.php/Gotchas Swap expects to get a contiguous set of sectors, whether it's on a partition or a filesystem. But Btrfs doesn't work this way at all, all metadata and data extents are logical addresses internally, those get translated by a chunk tree to reference device(s) and sector the data is located on. The way balancing and allocation work, those chunks can be moved at anytime to any device or even across multiple devices. Getting swapfiles support means work for swap as well as Btrfs. https://btrfs.wiki.kernel.org/index.php/Project_ideas#Swap_file_support https://lwn.net/Articles/625412/ But it's an open question what limitations this will have for a snapshottable cow file system even if it gets finished. I'm kinda thinking maybe the file would need to go in its own subvolume that gets some kind of nosnapshot attribute? I'm not really sure but snapshotting swap seems like a bad idea. -- Chris Murphy -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
