Comment by masklinn

In that thread, Craig Ringer and Thomas Munro notes most systems & FS won't report ENOSPC on fsync(), they'll do that on write():

> ENOSPC doesn't seem to be a concern during normal operation of major file systems (ext3, ext4, btrfs, xfs) because they reserve space before returning from write(). But if a buffered write does manage to fail due to ENOSPC we'll definitely see the same problems. This makes ENOSPC on NFS a potentially data corrupting condition since NFS doesn't preallocate space before returning from write().