Hello, (Still in my quest for BTRFS performance) It is extremely unclear which BTRFS mount options are "filesystem wide" and will apply to each and every mountpoint in the BTRFS filesystem, and which options can be set per subvolume or per mountpoint. As far as I can tell, there is no reliable documentation about this, is there any ? (Kernel is 3.13, Fedora) i.e. I have in fstab : /dev/sda3 / btrfs subvol=FEDORA,noatime,compress=lzo,autodefrag ...So without suprise I get in /proc/self/mountinfo: 36 1 0:32 /FEDORA / rw,noatime shared:1 - btrfs /dev/sda3 rw,seclabel,compress=lzo,space_cache,autodefrag ...But then I have in fstab: /dev/sda3 /home/me/.cache btrfs subvol=/NOCOW/me/.cache,nodatacow,compress=no,noatime So it is with great suprise the I get in /proc/self/mountinfo: 49 47 0:32 /NOCOW/me/.cache /home/me/.cache rw,noatime shared:33 - btrfs /dev/sda3 rw,seclabel,compress=lzo,space_cache,autodefrag ...I'm not suprised to see "space_cache" which I would assume to be FS-wide, but what the hell does "autodefrag" do in there, or even worse "compress=lzo", where "compress=no" has been exlicitely specified in fstab ? That's a bug, as far as I can tell. Kind regards. -- Swâmi Petaramesh <swami@xxxxxxxxxxxxxx> http://petaramesh.org PGP 9076E32E -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
