On 4/24/18 2:28 AM, michael.arndt@xxxxxxxxx wrote: > Hello * > > Will fstrim operations for a thin provisioning storage and xfs quota conflict with each other ? > > If i understand fstrim code correctly, in case of xfs / thin provisioning storage it tells xfs to release unused blocks. > > I have read indications that blocks are marked to the underlying storage as freed by zeroing them out. Brian addressed most of this, I think, but the short answer is that no, fstrim will in no way affect xfs quota. Everything happening as a result of fstrim happens well below what the quota subsystem even knows about. Even if discard happens via WRITE_SAME, that's not anything quota is aware of. Short answer is: There is no conflict. Thanks, -Eric > Is the "write zeros" correct information, or will be commands like scsi unmap or FITRIM be sent to the storage ? > > I found many exact references to fstrim on SSD, but no technical description on which operation is implemented for thin provisioning storages. > > TIA > Micha -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
