Chris Murphy

Even better. Delete all the fallocated files, back to the state I was in at the start. Except `df` has a completely different idea about Avail amount. ``` $ df...

I remember discussing the removal of musage=0, but not dusage=0.

I'm running into this problem as well, and -x doesn't really help because it ends up skipping nested btrfs subvolumes on the same file system. So what's really needed is...

The main reason for creating a subvolume instead of a directory is subvolumes can have qgroups enabled on them and can be snapshot. Btrfs snapshots are open-ended compared to LVM...

> Also, [subvolumes] can be individually mounted via the "subvol=" mount option, and directories can't, right? Correct. Although it is in effect a bind mount which you can also do...

I'll ask the Fedora maintainer if it's possible to apply that commit. Is this the same problem or should I file a separate issue? ``` # /usr/share/bcc/tools/xfsslower 5 cannot attach...

5.8.0-0.rc7.1.fc33.x86_64 and 5.8.0-0.rc7.1.fc33.x86_64+debug ``` $ cat /proc/kallsyms | grep xfs_file_read_iter $ cat /proc/kallsyms | grep xfs 0000000000000000 t copy_to_xfs_dqblk 0000000000000000 B selinuxfs_mount ```

It's user error. The xfs module hasn't yet loaded. Simply doing `modprobe xfs` and now it works OK. Sorry for the noise.

I'm hitting this on Fedora 26, with a 4.11.3 kernel. [root@f26h tools]# ./btrfsslower chdir(/lib/modules/4.11.3-300.fc26.x86_64/build): No such file or directory Traceback (most recent call last): File "./btrfsslower", line 322, in b...

>We have a separate btrfs plugin with "advanced" btrfs functionality: OK cool!