Hi, When using fstrim on an ext4 filesystem trim are not issued for EXT4_MB_GRP_WAS_TRIMMED space which is a useful optimization. Is there a way to force a complete trim on a mounted ext4 filesystem? My (limited) understanding of the code is that EXT4_MB_GRP_CLEAR_TRIMMED should be called to do so. My use case is having live migrated a virtual machine root disk from one storage to another, the target supporting trim, but since fstrim in the VM post migration does mostly nothing (assumes most space was trimmed) I cannot release space to the new storage. I tried mount -o remount but without effect. e2fsprogs don't seem to have an option/tool to do this either. I've seen suggestion that rebooting will do the job but the whole point of live migration is to avoid reboot :). I did end up creating dummy files to fill the filesystem and then removing them, but this is far less efficient than what a filesystem tool could do. Thanks in advance for your help, Sincerely, Laurent
